CA2068208C - Slide projector - Google Patents
Slide projectorInfo
- Publication number
- CA2068208C CA2068208C CA002068208A CA2068208A CA2068208C CA 2068208 C CA2068208 C CA 2068208C CA 002068208 A CA002068208 A CA 002068208A CA 2068208 A CA2068208 A CA 2068208A CA 2068208 C CA2068208 C CA 2068208C
- Authority
- CA
- Canada
- Prior art keywords
- frame
- slide
- cassette
- projector
- grabber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B23/00—Devices for changing pictures in viewing apparatus or projectors
- G03B23/02—Devices for changing pictures in viewing apparatus or projectors in which a picture is removed from a stock and returned to the same stock or another one; Magazines therefor
- G03B23/04—Devices for changing pictures in viewing apparatus or projectors in which a picture is removed from a stock and returned to the same stock or another one; Magazines therefor with linear movement
- G03B23/048—Devices for changing pictures in viewing apparatus or projectors in which a picture is removed from a stock and returned to the same stock or another one; Magazines therefor with linear movement with horizontally sliding mechanism
Abstract
A slide projector having a projector frame and a light source and lens assembly mounted on the frame which includes a cassette having a plurality of slide frame receptacles for receiving slide frames therein. The cassette is movable so as to bring selected slide frames into a dispensing position. A frame grabber mounted on the projector fame is movable in a direction perpendicular to the lens axis from a projection position in which an image of an engaged slide can be projected to a dispensing position in which slide frames can be sequentially brought into alignment with the grabber. Once engaged by the grabber, a selected aligned slide frame can be extracted from the cassette and moved to the projection position.
Description
SLIDE PROJECTOR
BACRGROUND
The present invention relates to a slide projector with an automatic slide changer.
Conventional slide projectors permit slides to be changed only in a sequential manner. One type of known slide changer has slides held abutting one another in a chute and are urged toward a dispensing position either by gravity or with spring force. A problem with such dispensers results from the friction between slides which frequently causes them to jam and resist being dispensed.
In addition, there is no reliable means by which slides in such a feed arrangement can be randomly dispensed.
Another problem with known dispensers results from the large number of moving parts such as pivotal slide frame actuators. The reliability of such changers is generally inversely proportional to the number of such moving parts.
In applications such as for projection of live theatre backdrops, the failure to properly dispense slide frames can be traumatic and has created a need for a reliable slide changer.
Moreover, in many applications such as for slide presentations to a live audience, there can be a substantial delay in having to sequentially run through slides in order to refer to a previously shown slide. The cycle time for a conventional slide projector for changing a slide is approximately 8 seconds.
U. S. Patent No. 3,123,925 issued to D. Johnson discloses a slide changer utilizing a slide cassette having separate slide receptacles and a frame grabber with hooks to engage a user selected slide and withdraw it from the cassette for removal to a projecting position. However, Johnson uses a separate rotatable disc to transfer slide frames to the projecting position and a pair of upper and lower hooks to move each slide frame to and from the cassette to the disc. Both hooks move together when transferring a slide frame from the cassette to the disc but subsequent to the latter action the hooks must be returned to an upper position so that they do not interfere with rotation of the disc. Before returning to the uppermost position, the lower set of hooks must move apart so that they can clear the slide frame. A large number of complex moving parts are required both for installing the frame on the disc, in rotating the disc and in moving the lower hooks away from the sides of the slide frame before moving the hooks upwardly.
U. S. Patent No. 3,486,818 issued to Hoppmann et al.
discloses a carousel shaped cassette in combination with a linearly movable frame grabber. However, the frame grabber uses a spring tensioned pivotal hooked lug to engage a circumferential groove in the slide frame. A set screw in combination with a spring biased rod control movement of the lug so as to limit downward movement and control upward movement. Obviously, the various moving parts in the pivotal lug require adjustment from time to time and are susceptible to breakage or falling out of adjustment.
Moreover, a number of rotating linkages required to move the frame from the cassette to the projecting position involve an even larger number of moving parts.
Accordingly, it is an object of the present invention to provide a slide projector with a simpler, more reliable automatic slide changer.
- 206~208 SUMMARY OF THE lNV~;N ~ lON
According to the invention there is provided a slide projector which comprises a projector frame and a cassette mounted on the projector frame. The cassette has a plurality of slide frame receptacles for receiving slide frames therein and is movable relative to the projector frame between a start position and a dispensing position so as to bring user selected slide frames into the dispensing position. The slide projector further includes a frame grabber mounted on the projector frame for moving the slide frames from a frame dispensing position to a projection position and back again. A light source and a lens assembly are mounted on the projector frame such that after engaging one of the slide frames, the frame grabber and slide engaged frame are movable linearly with respect to the projector frame to the projection position in which an image of the engaged slide frame can be projected and following projection the frame grabber and engaged slide frame are movable linearly from the projection position back to the dispensing position in which the engaged slide frame is returned to its receptacle in the cassette without movement relative to said hooks until the cassette removes the engaged slide frame from engagement with the frame grabber.
The invention is characterized in that the frame grabber has frame engaging hooks which are stationary with respect to the frame grabber and, when in the frame dispensing position, the slide frames are brought into and out of engagement with the hooks by movement of said cassette, and in that an elongated lead screw is mounted on the projector frame with motor means for reversibly driving the lead screw, wherein the frame grabber has a threaded opening threadedly engaged with threads of the elongated lead screw.
In response to rotation of the lead screw, the frame grabber is reversibly movable along a track affixed to the frame between the projection position and the dispensing position.
Preferably, the frame grabber has no moving parts coupled thereto other than those for moving the frame grabber linearly.
Advantageously, the slide projector includes a guide block mounted on the projector frame, the guide block having a guide channel therein to receive protuberances on said slide frames and being arranged to guide the slide frames successively into position into engagement with said frame grabber when said frame grabber is in the dispensing position.
BRIBF DESCRIPTION OF THE DR~WINGS
The novel features believed characteristic of the invention are set forth in the appended claims. The invention itself, as well as other features and advantages thereof, will be best understood by reference to the description which follows read in conjunction with the accompanying drawings, wherein:
Figure 1 is a perspective view of the slide projector showing principal elements of the automatic slide changer;
Figure 2 is a sectional view taken along the line 2-2 of Figure l;
Figure 3 is partial perspective view showing the cassette guide block, a portion of the cassette and slide frame and the frame grabber in a position to engage a slide frame;
Figure 4 is a block diagram of the electronic control system for the slide changer.
DETAILED DESCRIPTION WITH REFERENCE TO THE DRAWINGS
Referring to Figure 1 there is shown a slide projector 10 having a mercury arc lamp 22, a condenser 20 axially aligned with the light source 22 and an automatic slide changer assembly 11. An objective lens 19 located on the other side of slide changer assembly 11 to condenser 20 forms an image of slide 18 on a distant projection screen or surface (not shown). The slide changer assembly 11 which includes a cassette 14 for holding up to 32 slide frames 16 is movable linearly parallel to an axis of the lens assembly consisting of condenser 20 and objective lens 19 and having an open side 13 facing towards the lens assembly 20. A
slide grabber 30 is slidable over a track 17 in a direction perpendicular to an axis of the lens assembly (19, 20) from a position as shown in which a slide frame 16 and slide 18 are positioned for image projection to a position in which the slide 18 and slide frame 16 are stored in the cassette 14. A threaded grabber block 26 engages with threads of a slide screw 28 and in response to rotation of the slide screw the block 26 and an attached frame grabber 30 travel reversibly along track 17. Electronics for the control of slide changer assembly 11 are housed in casing 23.
Figure 2 shows the cassette 14 and a part of slide grabber 30. The interior as seen through open side 13 of the cassette 14 has a plurality of spaced apart parallel grooves formed by sets of upper, lower and end partitions 50, 52 and 51, respectively. Each slide frame 16 is made up of two top elements 41 and two side elements 42 joined together by four screws 45, 46, 47 and 48 having protruding heads 40. A pair of glass sheets enclosing a film or a pair of flexible sheets one bearing a picture and enclosed in a metal sleeve 19 around the perimeter thereof are positioned in grooves (not shown) in the elements 41 and 42.
Cassette 14 is removably affixed to a mounting plate 15. A U-shaped block 43 is affixed to the underside of mounting plate 15 and slides over an elongated slide block 44. A lead screw block 54 also affixed to the underside of mounting plate 15 has a threaded hole 55 therethrough which threadedly engages an elongated lead screw 56. Rotation of lead screw 56 causes block 54 and, thus, the plate 15 and cassette 14, to move over slide block 44. A contact switch 58 is positioned to be contacted by block 54 upon movement of the cassette 14 back to a start position. Cassette 14 may be removed by moving it to the start position adjacent switch 58 and then removing it from mounting plate 15. A head portion of frame grabber 30 is shown with a pair of hooks or shoulders 32. Hooks 32 each engage the heads 40 of screws 45 and 46 of a slide frame 16.
Referring to Figure 3 as well as to Figure 2 a guide block 36 is affixed to the projector frame 27 having a raised portion 39 with an elongated channel 38 formed therein parallel to the direction of travel of the cassette 14. The projecting head 40 of a screw 45 used to fasten together parts forming each slide frame 16 enters the channel 38 as the cassette 14 is moved forwardly from its start position and constrains the head 40 so that upon exiting from channel 38 it abuts a shoulder 32 of frame grabber 30 both for screw 45 and for screw 46 at the top of the slide frame above screw 45. By stopping the cassette 14 at a selected position a selected cassette slide frame 16 is located such that its screw heads 40 abut hooks 32.
2068~0~
Referring to Figure 4 there is shown a block diagram of the control electronics which consist of a processor 70 containing read only memory (ROM) in which is stored a control program, an input interface 72 for interfacing contact switches 82 with the processor 70 and an output interface 74 for interfacing the processor with drive motors 76 and 78 for driving the cassette 14 and frame grabber 30, respectively. A control panel 80 is also coupled to the control processor 70 for transmitting user control signals to and from the processor 70. An external port 83 is connected to the processor 70 for coupling thereto a cable leading to a remote control panel.
In operation, a number of slide frames 16 are stored in the receptacles of cassette 14 in locations which are recorded by a user. The cassette 14 is then caused to be moved to a start location in which contact switch 58 is actuated. Information is then provided by a user through control panel 80 or into port 83 from a remote control panel (not shown) as to which slide frame 16 is to be dispensed and moved into place for projection. Processor 70 issues control signals through output interface 74 to motor 78 which causes lead screw 28 to rotate and frame grabber 30 to move to a position adjacent raised portion 39 of guide block 36 such that hook 32 is aligned with a side of channel 38 nearest cassette 14. Processor 70 then issues another control signal which causes motor 78 to become activated and to drive lead screw 56 so that cassette 14 is moved to bring a desired slide frame into alignment with hooks 32. In this manner screw head 40 of screw 45 comes into a position in which it abuts lower hook 32 of frame grabber 30. Another control signal from processor 70 causes motor 78 to reverse and move the frame grabber 30 back until slide frame 16 is positioned intermediate condenser lens 20 and objective lens 19 such that an image of its slide 18 can be projected.
`- 2068208 Upon receipt of a further user control signal, processor 70 activates motor 78 causing the frame grabber 30 to return the slide frame 16 into its associated receptacle in cassette 14. Cassette 14 can then be moved either to bring a next receptacle or any other desired receptacle into alignment with hooks 32 of frame grabber 30. The slide frame dispensing operation outlined above is then repeated.
Receptacle positioning of cassette 14 is achieved by use of contact switch 58. The point at which cassette 14 actuates switch 58 defines a reference position from which each slot or receptacle in cassette 14 is measured in terms of the number of revolutions of motor 76. A corresponding contact switch 31 is positioned to be actuated when frame grabber 30 reaches a projection position in which an image of slide 18 may be projected.
It will be appreciated that the slide frame engagement process involves no pivoting of moving parts and so is inherently reliable. Moreover, the use of separate slide frame receptacles to store and position slides combined with movement of the cassette 14 rather than the slides avoids any problems due to friction involved between slides as occurs in conventional slide changer mechanisms.
Although a cassette which moves linearly is the most convenient and simplest arrangement, obviously a carousel cassette may be employed with an arcuate guide channel for the screw heads. However, the number of slide frames a carousel arrangement would be able to store without occupying too large a diameter would be limited.
Accordingly, while this invention has been described with reference to illustrative embodiments, this description is not intended to be construed in a limiting sense.
Various modifications of the illustrative embodiments, as well as other embodiments of the invention, will be apparent to persons skilled in the art upon reference to this description. It is therefore contemplated that the appended claims will cover any such modifications or embodiments as fall within the true scope of the invention.
BACRGROUND
The present invention relates to a slide projector with an automatic slide changer.
Conventional slide projectors permit slides to be changed only in a sequential manner. One type of known slide changer has slides held abutting one another in a chute and are urged toward a dispensing position either by gravity or with spring force. A problem with such dispensers results from the friction between slides which frequently causes them to jam and resist being dispensed.
In addition, there is no reliable means by which slides in such a feed arrangement can be randomly dispensed.
Another problem with known dispensers results from the large number of moving parts such as pivotal slide frame actuators. The reliability of such changers is generally inversely proportional to the number of such moving parts.
In applications such as for projection of live theatre backdrops, the failure to properly dispense slide frames can be traumatic and has created a need for a reliable slide changer.
Moreover, in many applications such as for slide presentations to a live audience, there can be a substantial delay in having to sequentially run through slides in order to refer to a previously shown slide. The cycle time for a conventional slide projector for changing a slide is approximately 8 seconds.
U. S. Patent No. 3,123,925 issued to D. Johnson discloses a slide changer utilizing a slide cassette having separate slide receptacles and a frame grabber with hooks to engage a user selected slide and withdraw it from the cassette for removal to a projecting position. However, Johnson uses a separate rotatable disc to transfer slide frames to the projecting position and a pair of upper and lower hooks to move each slide frame to and from the cassette to the disc. Both hooks move together when transferring a slide frame from the cassette to the disc but subsequent to the latter action the hooks must be returned to an upper position so that they do not interfere with rotation of the disc. Before returning to the uppermost position, the lower set of hooks must move apart so that they can clear the slide frame. A large number of complex moving parts are required both for installing the frame on the disc, in rotating the disc and in moving the lower hooks away from the sides of the slide frame before moving the hooks upwardly.
U. S. Patent No. 3,486,818 issued to Hoppmann et al.
discloses a carousel shaped cassette in combination with a linearly movable frame grabber. However, the frame grabber uses a spring tensioned pivotal hooked lug to engage a circumferential groove in the slide frame. A set screw in combination with a spring biased rod control movement of the lug so as to limit downward movement and control upward movement. Obviously, the various moving parts in the pivotal lug require adjustment from time to time and are susceptible to breakage or falling out of adjustment.
Moreover, a number of rotating linkages required to move the frame from the cassette to the projecting position involve an even larger number of moving parts.
Accordingly, it is an object of the present invention to provide a slide projector with a simpler, more reliable automatic slide changer.
- 206~208 SUMMARY OF THE lNV~;N ~ lON
According to the invention there is provided a slide projector which comprises a projector frame and a cassette mounted on the projector frame. The cassette has a plurality of slide frame receptacles for receiving slide frames therein and is movable relative to the projector frame between a start position and a dispensing position so as to bring user selected slide frames into the dispensing position. The slide projector further includes a frame grabber mounted on the projector frame for moving the slide frames from a frame dispensing position to a projection position and back again. A light source and a lens assembly are mounted on the projector frame such that after engaging one of the slide frames, the frame grabber and slide engaged frame are movable linearly with respect to the projector frame to the projection position in which an image of the engaged slide frame can be projected and following projection the frame grabber and engaged slide frame are movable linearly from the projection position back to the dispensing position in which the engaged slide frame is returned to its receptacle in the cassette without movement relative to said hooks until the cassette removes the engaged slide frame from engagement with the frame grabber.
The invention is characterized in that the frame grabber has frame engaging hooks which are stationary with respect to the frame grabber and, when in the frame dispensing position, the slide frames are brought into and out of engagement with the hooks by movement of said cassette, and in that an elongated lead screw is mounted on the projector frame with motor means for reversibly driving the lead screw, wherein the frame grabber has a threaded opening threadedly engaged with threads of the elongated lead screw.
In response to rotation of the lead screw, the frame grabber is reversibly movable along a track affixed to the frame between the projection position and the dispensing position.
Preferably, the frame grabber has no moving parts coupled thereto other than those for moving the frame grabber linearly.
Advantageously, the slide projector includes a guide block mounted on the projector frame, the guide block having a guide channel therein to receive protuberances on said slide frames and being arranged to guide the slide frames successively into position into engagement with said frame grabber when said frame grabber is in the dispensing position.
BRIBF DESCRIPTION OF THE DR~WINGS
The novel features believed characteristic of the invention are set forth in the appended claims. The invention itself, as well as other features and advantages thereof, will be best understood by reference to the description which follows read in conjunction with the accompanying drawings, wherein:
Figure 1 is a perspective view of the slide projector showing principal elements of the automatic slide changer;
Figure 2 is a sectional view taken along the line 2-2 of Figure l;
Figure 3 is partial perspective view showing the cassette guide block, a portion of the cassette and slide frame and the frame grabber in a position to engage a slide frame;
Figure 4 is a block diagram of the electronic control system for the slide changer.
DETAILED DESCRIPTION WITH REFERENCE TO THE DRAWINGS
Referring to Figure 1 there is shown a slide projector 10 having a mercury arc lamp 22, a condenser 20 axially aligned with the light source 22 and an automatic slide changer assembly 11. An objective lens 19 located on the other side of slide changer assembly 11 to condenser 20 forms an image of slide 18 on a distant projection screen or surface (not shown). The slide changer assembly 11 which includes a cassette 14 for holding up to 32 slide frames 16 is movable linearly parallel to an axis of the lens assembly consisting of condenser 20 and objective lens 19 and having an open side 13 facing towards the lens assembly 20. A
slide grabber 30 is slidable over a track 17 in a direction perpendicular to an axis of the lens assembly (19, 20) from a position as shown in which a slide frame 16 and slide 18 are positioned for image projection to a position in which the slide 18 and slide frame 16 are stored in the cassette 14. A threaded grabber block 26 engages with threads of a slide screw 28 and in response to rotation of the slide screw the block 26 and an attached frame grabber 30 travel reversibly along track 17. Electronics for the control of slide changer assembly 11 are housed in casing 23.
Figure 2 shows the cassette 14 and a part of slide grabber 30. The interior as seen through open side 13 of the cassette 14 has a plurality of spaced apart parallel grooves formed by sets of upper, lower and end partitions 50, 52 and 51, respectively. Each slide frame 16 is made up of two top elements 41 and two side elements 42 joined together by four screws 45, 46, 47 and 48 having protruding heads 40. A pair of glass sheets enclosing a film or a pair of flexible sheets one bearing a picture and enclosed in a metal sleeve 19 around the perimeter thereof are positioned in grooves (not shown) in the elements 41 and 42.
Cassette 14 is removably affixed to a mounting plate 15. A U-shaped block 43 is affixed to the underside of mounting plate 15 and slides over an elongated slide block 44. A lead screw block 54 also affixed to the underside of mounting plate 15 has a threaded hole 55 therethrough which threadedly engages an elongated lead screw 56. Rotation of lead screw 56 causes block 54 and, thus, the plate 15 and cassette 14, to move over slide block 44. A contact switch 58 is positioned to be contacted by block 54 upon movement of the cassette 14 back to a start position. Cassette 14 may be removed by moving it to the start position adjacent switch 58 and then removing it from mounting plate 15. A head portion of frame grabber 30 is shown with a pair of hooks or shoulders 32. Hooks 32 each engage the heads 40 of screws 45 and 46 of a slide frame 16.
Referring to Figure 3 as well as to Figure 2 a guide block 36 is affixed to the projector frame 27 having a raised portion 39 with an elongated channel 38 formed therein parallel to the direction of travel of the cassette 14. The projecting head 40 of a screw 45 used to fasten together parts forming each slide frame 16 enters the channel 38 as the cassette 14 is moved forwardly from its start position and constrains the head 40 so that upon exiting from channel 38 it abuts a shoulder 32 of frame grabber 30 both for screw 45 and for screw 46 at the top of the slide frame above screw 45. By stopping the cassette 14 at a selected position a selected cassette slide frame 16 is located such that its screw heads 40 abut hooks 32.
2068~0~
Referring to Figure 4 there is shown a block diagram of the control electronics which consist of a processor 70 containing read only memory (ROM) in which is stored a control program, an input interface 72 for interfacing contact switches 82 with the processor 70 and an output interface 74 for interfacing the processor with drive motors 76 and 78 for driving the cassette 14 and frame grabber 30, respectively. A control panel 80 is also coupled to the control processor 70 for transmitting user control signals to and from the processor 70. An external port 83 is connected to the processor 70 for coupling thereto a cable leading to a remote control panel.
In operation, a number of slide frames 16 are stored in the receptacles of cassette 14 in locations which are recorded by a user. The cassette 14 is then caused to be moved to a start location in which contact switch 58 is actuated. Information is then provided by a user through control panel 80 or into port 83 from a remote control panel (not shown) as to which slide frame 16 is to be dispensed and moved into place for projection. Processor 70 issues control signals through output interface 74 to motor 78 which causes lead screw 28 to rotate and frame grabber 30 to move to a position adjacent raised portion 39 of guide block 36 such that hook 32 is aligned with a side of channel 38 nearest cassette 14. Processor 70 then issues another control signal which causes motor 78 to become activated and to drive lead screw 56 so that cassette 14 is moved to bring a desired slide frame into alignment with hooks 32. In this manner screw head 40 of screw 45 comes into a position in which it abuts lower hook 32 of frame grabber 30. Another control signal from processor 70 causes motor 78 to reverse and move the frame grabber 30 back until slide frame 16 is positioned intermediate condenser lens 20 and objective lens 19 such that an image of its slide 18 can be projected.
`- 2068208 Upon receipt of a further user control signal, processor 70 activates motor 78 causing the frame grabber 30 to return the slide frame 16 into its associated receptacle in cassette 14. Cassette 14 can then be moved either to bring a next receptacle or any other desired receptacle into alignment with hooks 32 of frame grabber 30. The slide frame dispensing operation outlined above is then repeated.
Receptacle positioning of cassette 14 is achieved by use of contact switch 58. The point at which cassette 14 actuates switch 58 defines a reference position from which each slot or receptacle in cassette 14 is measured in terms of the number of revolutions of motor 76. A corresponding contact switch 31 is positioned to be actuated when frame grabber 30 reaches a projection position in which an image of slide 18 may be projected.
It will be appreciated that the slide frame engagement process involves no pivoting of moving parts and so is inherently reliable. Moreover, the use of separate slide frame receptacles to store and position slides combined with movement of the cassette 14 rather than the slides avoids any problems due to friction involved between slides as occurs in conventional slide changer mechanisms.
Although a cassette which moves linearly is the most convenient and simplest arrangement, obviously a carousel cassette may be employed with an arcuate guide channel for the screw heads. However, the number of slide frames a carousel arrangement would be able to store without occupying too large a diameter would be limited.
Accordingly, while this invention has been described with reference to illustrative embodiments, this description is not intended to be construed in a limiting sense.
Various modifications of the illustrative embodiments, as well as other embodiments of the invention, will be apparent to persons skilled in the art upon reference to this description. It is therefore contemplated that the appended claims will cover any such modifications or embodiments as fall within the true scope of the invention.
Claims (17)
1. A slide projector (10), comprising: a projector frame (27), a cassette (14) mounted on said projector frame (27) the cassette having a plurality of slide frame receptacles (50, 51, 52) for receiving slide frames (16) therein and being movable relative to said projector frame (27) between a start position and a dispensing position so as to bring user selected slide frames (16) into the dispensing position, a frame grabber (30) mounted on said projector frame (27) for moving the slide frames (16) from a frame dispensing position to a projection position and back again, and a light source (22) and a lens assembly (20) mounted on said projector frame (27), such that after engaging one of the slide frames (16), said frame grabber (30) and slide engaged frame (16) are movable linearly with respect to said projector frame (27) to the projection position in which an image of the engaged slide frame (16) can be projected and following projection said frame grabber (30) and engaged slide frame (16) are movable linearly from the projection position back to the dispensing position in which the engaged slide frame (16) is returned to its receptacle in said cassette (14) without movement relative to said hooks ( 32) until said cassette (14) removes the engaged slide frame (16) from engagement with said frame grabber (30), characterized in that said frame grabber (30) has frame engaging hooks (3 2) which are stationary with respect to said frame grabber (30) and, when in the frame dispensing position, the slide frames (16) are brought into and out of engagement with said hooks ( 32) by movement of said cassette (14), including an elongated lead screw (28) mounted on said projector frame (27) and motor means (78) for reversibly driving said lead screw (28) wherein said frame grabber (30) has a threaded opening threadedly engaged with threads of said elongated lead screw (28) and, in response to rotation of said lead screw, said frame grabber (30) is reversibly movable along a track (17) affixed to said frame (27) between the projection position and the dispensing position.
2. A slide projector according to claim 1, wherein said frame grabber (30) has no moving parts coupled thereto other than those for moving said frame grabber linearly.
3. A slide projector according to claim 1, including a guide block (36) mounted on said projector frame, said guide block (36) having a guide channel (38) therein to receive protuberances (40) on said slide frames (16) and being arranged to guide said slide frames (16) successively into position into engagement with said frame grabber (30) when said frame grabber is in the dispensing position.
4. A slide projector according to claim 1, wherein said cassette (14) has a block (54) attached thereto with a threaded opening (55) and including a cassette lead screw (56) threadedly engaged with said block opening such that in response to rotation of said cassette lead screw (56) said cassette is reversibly movable relative to said projector frame (27) between a start and an end position.
5. A slide projector according to claim 4, wherein said cassette (14) is removable from said cassette block (54).
6. A slide projector according to claim 4, including a motor (78) coupled to said elongated lead screw (28) for reversibly, rotatably driving said elongated lead screw.
7. A projector according to claim 4, including a motor (76) coupled to said cassette lead screw for reversibly, rotatably driving said cassette lead screw (56).
8. A projector according to claim 4, including a contact switch (58) mounted on said projector frame (12) and positioned so that said cassette block (54) operates said switch (58) when moved to a start position.
9. A projector according to claim 4, including a linear slide (44) mounted on said frame (27) below said cassette (14) parallel to said lead screw (56) and a cassette guide (43) mounted on an underside of said cassette (14) slidably engageable with said linear slide.
10. A projector according to claim 1, including contact switches for switching in response to movement of said cassette (14) and frame grabber (30) to predetermined positions, a frame drive motor (78) coupled to said frame grabber (30) for reversibly driving said grabber (30) from the projection position to the frame dispensing position, a cassette drive motor (76) coupled to said cassette (14) for reversibly driving said cassette, a processor (70), an output interface circuit (74) coupled between said processor (70) and said frame (78) and cassette (76) drive motors, and an input interface circuit (72) coupled to said processor (70) and to said contact switches (82).
11. A projector according to claim 6, including a control panel (80) coupled to said processor (70) for providing control signals to said processor (70) so as to operate said drive motors (76, 78) in a selected manner so as to move a selected one of said slide frames (16) from said cassette (14) to the projection position or out of the projection position into a corresponding slide receptacle of said cassette (14).
12. A projector according to claim 10, including a control port (83) on said processor (70) for conducting control and data signals between said processor (70) and a remote control panel.
13. A slide projector according to claim 1 including cassette motor means (76) for reversibly moving said cassette (14) to a selected position;
frame grabber motor means (78) for reversibly moving said frame grabber (30); and means for guiding said slide frames (16) into engagement with said frame grabber (30) one after another as said cassette (14) is moved forwardly away from said start position.
frame grabber motor means (78) for reversibly moving said frame grabber (30); and means for guiding said slide frames (16) into engagement with said frame grabber (30) one after another as said cassette (14) is moved forwardly away from said start position.
14. A slide projector according to claim 13, including a plurality of slide frames (16) reversibly insertable into said slide frame receptacles (50, 51, 52), each of said slide frames (16) including a pair of opposed projections on an end thereof and said frame grabber (30) has a pair of opposed, stationary hooks (40) for engaging said opposed projections.
15. A method of dispensing slide frames (16) stored in a movable cassette (14) of a projector (10) comprising:
moving a slide frame grabber (30) having a pair of stationary slide frame engaging elements (32) into a dispensing position juxtaposed to associated receiving elements (40) on said slide frames (16) for receiving said engaging elements;
moving said cassette (14) so that a selected slide frame (16) is engaged with said frame engaging elements (32);
moving said slide frame grabber (30) and engaged slide frame (16) linearly back to a projection position in which an image of a slide contained in said slide frame (16) is projected and then returning said slide frame back to said cassette after projection all without disengaging said frame grabber slide frame.
moving a slide frame grabber (30) having a pair of stationary slide frame engaging elements (32) into a dispensing position juxtaposed to associated receiving elements (40) on said slide frames (16) for receiving said engaging elements;
moving said cassette (14) so that a selected slide frame (16) is engaged with said frame engaging elements (32);
moving said slide frame grabber (30) and engaged slide frame (16) linearly back to a projection position in which an image of a slide contained in said slide frame (16) is projected and then returning said slide frame back to said cassette after projection all without disengaging said frame grabber slide frame.
16. A method according to claim 15, including moving said cassette (14) linearly.
17. A method according to claim 15, including moving said slide frame (16) linearly perpendicular to an axis of projection of said projector (10).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US434,002 | 1989-11-09 | ||
| US07/434,002 US4974959A (en) | 1989-11-09 | 1989-11-09 | Slide projector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2068208C true CA2068208C (en) | 1995-05-23 |
Family
ID=23722414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002068208A Expired - Fee Related CA2068208C (en) | 1989-11-09 | 1990-11-06 | Slide projector |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4974959A (en) |
| EP (1) | EP0500593A1 (en) |
| AU (1) | AU6635190A (en) |
| CA (1) | CA2068208C (en) |
| WO (1) | WO1991007691A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5589953A (en) * | 1994-06-24 | 1996-12-31 | Nikon Corporation | Image input system having an auto-feeder including loading magazine and discharge magazine arranged side by side and method |
| US6251260B1 (en) | 1998-08-24 | 2001-06-26 | Therasense, Inc. | Potentiometric sensors for analytic determination |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3123925A (en) * | 1964-03-10 | johnson | ||
| US3486818A (en) * | 1968-06-06 | 1969-12-30 | Hoppmann Corp | Reversible slide projector |
| DE1772984B2 (en) * | 1968-07-30 | 1973-11-08 | Braun Ag, 6000 Frankfurt | Slide projector with a magazine drive that is separate from the drive of the slide changing element and a device for the free selection of the slide to be projected |
| DE1802546A1 (en) * | 1968-10-11 | 1970-05-14 | Rollei Werke Franke Heidecke | Interchangeable slide gripper for magazine still image projector |
| FR2066108A5 (en) * | 1969-10-31 | 1971-08-06 | Agfa Gevaert Ag | |
| DE2139406A1 (en) * | 1971-08-06 | 1973-02-15 | Rollei Werke Franke Heidecke | DIAMAGAZINE PROJECTOR WITH ELECTRIC IMAGE CHANGE DRIVE |
| US3914039A (en) * | 1974-08-01 | 1975-10-21 | Gaf Corp | Slide changing mechanism |
| US4015900A (en) * | 1974-12-16 | 1977-04-05 | Bell & Howell Company | Microfiche reader |
| DE2810883C3 (en) * | 1978-03-13 | 1980-09-25 | Bruno 5238 Hachenburg Meyer | Projector for slide plates |
| DE3016757C1 (en) * | 1980-04-30 | 1981-10-08 | Agfa-Gevaert Ag, 5090 Leverkusen | Slide projector |
| FR2489978A1 (en) * | 1980-09-09 | 1982-03-12 | Automatisme Cie Gle | BASKET FOR STORING AND SORTING FILES AND MACHINE FOR READING FILES ARRANGED IN SUCH BASKETS |
| US4568161A (en) * | 1984-01-13 | 1986-02-04 | Bell & Howell Company | Computer controlled slide projector interface arrangement |
-
1989
- 1989-11-09 US US07/434,002 patent/US4974959A/en not_active Expired - Fee Related
-
1990
- 1990-11-06 EP EP90915973A patent/EP0500593A1/en not_active Withdrawn
- 1990-11-06 WO PCT/CA1990/000380 patent/WO1991007691A1/en not_active Application Discontinuation
- 1990-11-06 CA CA002068208A patent/CA2068208C/en not_active Expired - Fee Related
- 1990-11-06 AU AU66351/90A patent/AU6635190A/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| AU6635190A (en) | 1991-06-13 |
| EP0500593A1 (en) | 1992-09-02 |
| WO1991007691A1 (en) | 1991-05-30 |
| US4974959A (en) | 1990-12-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |