US2276745A - Tearing strip applying device - Google Patents

Description

March 17, 1942. E. L. SMITH TEARING STRIP APPLYING DEVICE Filed March 6, 1941 5 Sheets-Sheet 1 INVENTOR EH52 Zarnz 6mm BY 7- Z d ATTORNEYS March 17, 1942. sMlTH TEARING STRIP APPLYING DEVICE Filed March 6, 1941 5 Sheets-Sheet 2 BY d'z LQ M ATTORNEYS March 17, 1942. E. L. SMITH BEARING STRIP APPLYING DEVICE Filed March 6, 1941 5 Sheets-Sheet 3 INVENTOR fl/vm Zorm 5mm ATTORNEYS March 17, 1942. E. L. SMITH 2,276,745

TEARING STRIP APPLYING DEVICE Filed March 6, 1941 5 Sheets-Sheet 4 INVENTOR [ix/m Zora: 5mm BY q 7 ATTORNEYS MarCh 17, 1942. E SMITH 2,276,745

TEARING STRIP APPLYING DEVICE Filed March 6, 1941 5 Sheets-Sheet 5 4 INVENTOR Z7176? Zd/[Zl 5M7 BY Z ATTORNEYS 'ated. The rolls l2, l3,

Patented Mar. 17, 1942 2,276,745 TEARING STRIP APPLYING DEVICE Elmer Lovell Smith, Longmeadow, Mass., assignor to Package Machinery Company, Springfield, Mass., a corporation of Massachusetts Application March 6, 1941, Serial No. 382,022

1 7 Claims.

This invention relates to improvements in mechanism for locating upon and aflixing to a wrapper in web form a succession of tearing strips extending transversely of the web. In the usual type of wrapping machine the tearing tape is placed upon the wrapper web in a longitudinal line. Such an apparatus is shown in the Melhorn Patent 1,965,524. With other typ s of wrapping machine, however, the tearing strip must be positioned transversely of the web; and as far as I am aware there have been up to the present time no mechanisms available for securing the tape to a web in this manner. It is the object of the invention to measure out and aiiix a succession of tape transversely of the web, and to do this while the web itself is moving forward either continuously or intermittently. It is a further object to provide a mechanism of this character in which the tape feed can be adjusted readily to accommodate different widths of webs. It is a further object to provide a tape applying mechanism capable of being attached as a unit to existing wrapping machines. Additional objects will appear from the following description and claims.

Referring to the drawings:

Fig. l is an elevation of the tape feeding mechanism;

Fig. 2 is a side elevation of this mechanism, taken on line 2-2 of Fig. 1;

Fig. 3 is a section therethrough showing the tape severing mechanism;

Fig. 4 is a section therethrough showing the web;

Fig. 5 is a sectional detail of the web feed rolls;

Fig. 6 is a detail corresponding to a part of Fig. 4 but showing the parts in a different position;

Fig.7 is a perspective detail of the tape severing mechanism and the mechanism for aflixing the severed tape to the web; and

Fig. 8 is a detail of a length of web with a plurality of spaced tapes affixed to it.

The tape feeding attachment is carried by a frame 10, which may if desired be a continuation of that of the wrapping machine and may be supported as by posts H. The wrapper web w comes from any desired source on the wrapping machine, and passes between rolls I2 and I3, constructed as will be described below, and then over guide rolls l4 and IS. The web feed is preferably controlled from the wrapping machine, being either continuous or intermittent depending upon the type of mechanism with which it is associ- I4, and I5 need not be 66 driven, since the web is pulled through them by the main web feeding devices. The tape t comes from any convenient source (Fig. 2) and passes around a flanged guide roll l6 and then between a pair of'intermittently driven rolls H and 18. Roll I1 is flanged, and has a central depression l9; while roll 18 fits between the flanges of roll [1 and has a central rib 20 entering the depression I9. The combined action of these rolls is to give to the tape a corrugation which substantiallyincreases the rigidity of the tape as it is fed out horizontally beyond the rolls (cf. Figs. 1, 2, and 7) Roll I8 is fast on a shaft 22 coupled through change gears 23, 24, and 25 with a shaft 26 which is intermittently driven in timed relation to the wrapping machine in a manner which will now be described. The intermediate gear 24 is carried by a'slotted arm 21 mounted on a post 28 as is customary with change gears; and the latter may be changed to vary the amount of tape fed out during each cycle of the machine. Upon shaft 26 is a second gear 29, in mesh with which an intermediate gear 30 is held by an arm 3| pivoted upon the shaft. A gear 32 is eccentrically mounted on a drive shaft 33, and the intermediate gear is held in mesh with it by an eccentric strap 34 pivoted to the arm 3| at 35. This mechanism is what is known as a wobble gear drive; and, as described in the Smith Patent 2,210,734, August 6, 1940, will produce intermittent motion of shaft 26 from a continuous rotation of shaft 33. Shaft 33 has bevel gear connection 36 (Fig. 1) with a shaft 31 coupled by sprocket and chain 38 with a suit able drive sprocket on the wrapping machine.

The tape projected from between the rolls l1 and I8 passes along a guide 40 (Figs. 3 and '7) and underneath a conical glue wheel 4| (Fig. 1) running in contact with the face of a transfer roll 42 dipping into a glue pot 43. Roll 42 is mounted on a shaft 44 having at its end a sprocket 45 given an intermittent motion synchronous with the movement of the tape by a chain 46 passing around a sprocket 41 on the shaft 22 and around an idle sprocket '48 adjustable for tighting purposes on a bracket 49 which carries the glue pot and is pivoted on shaft 22 for a purpose to be described. The conical wheel 4| may be driven in any desired way, as by contact with the roll 42.

From the wheel 4| the glued tape passes (Figs. 4, 6, and 7) onto a shelf 50 positioned in front of the bite of the web feeding rolls l2 and I3. slanting guides 5| on this shelf insure the correct positioning of the tape. As the tape comes to rest upon the shelf a length is severed from its leading end by a movable shear blade 52 pivoted at 58 to the lower blade 54 and actuated by a link 55 (Fig. 3) extending to a lever 56 pivoted to the frame at 51 and having a cam roll 58 held by a spring 68 against a cam 6i on shaft 31.

The severed tape lies in front of a plurality of fingers 62 movable in slots 63 in the shelf and carried by a swinging member 64. The member is pivoted at 65 to links 66 swinging at 61 from the shelf supporting brackets 68, and is connected to a pin Ill eccentrically mounted on a shaft carrying a sprocket 'II. This sprocket engages a chain I2 passing over a sprocket I3 on shaft 31 and around an idle adjusting sprocket 14. By the continued rotation of the sprocket the ends of the fingers will be moved through a path shown at in Figs. 4 and 6, pushing the tape laterally into the bite of rolls I2 and I3 (Fig. 7) and then returning to its rearward position in a lowered position underneath the next length of tape being advanced. The tape thus shifted by the fingers passes with the web between the rolls and is stuck. to it by reason of the adhesive coating it had previously received. As

successive lengths of tape are fed out, severed,

and pushed into contact with the wrapper, these lengths will be stuck to the web in spaced relation as shown in Fig. 8.

As shown in the latter figure the shears are so positioned as to leave a portion of the tape overhanging the edge of the sheet to serve later as a pull tab. It is desirable that this projecting end should not be coated with adhesive, and provision is therefore made for raising the wheel 4| from the tape at periodic intervals. As previously stated, the glue pot is mounted on a bracket 49 pivoted upon the shaft 22, the wheel 4i being carried on the glue pot. A cam roll I8 on the bracket rests upon a cam I9 mounted on the shaft 33, the cam having a local raised portion 88 of sufficient circumferential extent to raise the glue wheel off the tape the desired dis tance before the latter is brought to rest for severance.

It is in many cases desirable to cause the glue wheel to be elevated off the tape whenever the machine is stopped. To this end the bracket is fitted with a projecting arm 8I joined by a link 82 with the armature 83 of a solenoid which may be connected in any desired way in the main driving circuit, so that the glue wheel will be raised whenever the motor is stopped. In order to permit adjustment of the glue Wheel laterally of the tape the glue pot, which it will be recalled carries the wheel, is held to the bracket 49 by a clamp screw 84. When this screw is loosened the glue pot can be adjusted by screws 85 (Fig. 1) threaded into lugs 86 on the glue pot and engaging the sides of the bracket.

The various feed rolls are designed for manual separation to facilitate threading of the web or tape between them. The structure of the web feeding rolls I2 and I3 is best shown in Figs. 3, 4, and 5. Upper roll I2 is carried on collars 90 mounted on a shaft 9|, which at its ends is journaled in boxes 92 vertically movable in guideways 93. Lower roll I3 is made in spaced segments, the gap 94 between which permit the passage of the tape positioning fingers 62. The segments are mounted on collars 95 on a shaft 96 received in bearing members 91 on the frame. A gear 98 on shaft 9I' and a gear 99 on shaft 96 connect the two rolls for simultaneous movement. Normally the rolls are held in contact by springs I60 connecting the end of shaft 9| with a pin "II on the frame, but when desired-they may be separated by a handle I02 on the end of the shaft and carrying a cam portion I93 adapted to engage a bearing-plate I84 on the frame to elevate the shaft and retain it temporarily in elevated position.

Rolls I6 and I! are carried on end frames I pivoted to the frame III at :86 and provided with an upstanding handle I 01. To hold the frame in the raised position to which it may be moved by this means a bell crank I88 is pivoted on the handle I01, having one end serving as a latch handle and the other as a detent adapted to be drawn into engagement with an abutment'lll by a spring I Ill. The frames I85 are drawn in a direction to hold roll II in contact with roll II by a tension spring I I I.

What Iclaim is:

1. A machine for applying tearing strips across awrapper web which comprises a pair of web feed rolls, a shelf adjacent the bite of the rolls, means for placing an adhesive tearing strip on the shelf, and a pusher operable in timed rela-' tion to the web to engage one lateral edge of the tearing strip to shift it laterally from the shelf into the bite of the rolls.

2. A machine for applying tearing strips across a wrapper web which comprises a pair of web feed rolls, a shelf adjacent the bite of the rolls, means for placing a long narrow adhesive tearing strip on the shelf parallel to the axis of the rolls, and a pusher operable in timed relation to the web and movable bodily in an endless path with its return portion below the shelf to shift the tearing strip laterally from the shelf into the bite of the rolls.

3; A machine for applying tearing strips to a web which comprises a pair of web feed rolls, a pair of tape feed rolls at right angles thereto, means for rotating the tape feed rolls in timed relation to the web feed rolls to project a tape into adjacency with the bite of the web feed rolls, means to sever the projected tape, and a device having a movement of translation towards the rolls to deliver a severed tape into the bite of the web feed rolls.

4. A machine for applying tearing strips to a web which comprises a pair of web feed rolls, a pair'of tape feed rolls at right angles thereto,- means for rotating the tape feed rolls in timed relation to the web feed rolls to project a tape into adjacency with the bite of the web feed rolls, adhesive applying devices acting on the tape being so projected, means to sever the projected tape, and a device having a motion of translation towards the web feed rolls to deliver a severed adhesive tape into the bite of the rolls.

5. A machine for applying tearing strips to a web which comprises a pair of web feed rolls, a pair of tape feed rolls at right angles thereto, means for rotating the tape feed rolls in timed relation to the web feed rolls to projecta tape into adjacency with the bite of the web feed rolls, adhesive applying devices intermittently acting on the tape being so projected to leave a short uncoated portion in each length fed out, means to sever the projected tape at the end of said uncoated portion'with said portion overhanging the lateral edge of the web, and a device having a motion of translation towards the web feed rolls to deliver a severed adhesive tape into the bite of said rolls with said uncoated portion projecting from the side of the web.

6. A machine for applying tearing strips to a web which comprises a pair of web feed rolls, a

pair of tape feed rolls at right angles thereto, means for rotating the tape feed'rolls in timed relation to the web feed rolls to project a tape into adjacency with the bite of the web feed rolls, an adhesive applying wheel positioned to apply adhesive to said tape, means for supplying adhesive to said wheel, means for causing the wheel to contact the tape intermittently to leave a short uncoated portion in each length fed out, means to sever the projected tape at the end of said uncoated portion with said portion overhanging the lateral edge of the web, and a device having a motion of translation towards the web feed rolls to deliver a severed adhesive tape into the bite of said rolls with said uncoated portion projecting from the side of the web.

7. A machine for applying tearing strips to aweb which comprises a pair of web feed rolls, a pair of tape feed rolls at right angles thereto,

means for rotating the tape feed rolls in timed relation to the web feed rolls to project a tape into adjacency with the bite of the web feed rolls, an adhesive applying wheel positioned to apply adhesive to said tape, means for supplying adhesive to said wheel, means for causing the wheel to contact the tape intermittently to leave a short uncoated portion in each length fed out, solenoid controlled means for shifting the wheel out of contact with the tape upon stoppage of the machine, means to sever the projected tape at the end of said uncoated portion with said portion overhanging the lateral edge of the web, and a device having a motion of translation towards the web feed rolls to deliver a severed adhesive tape into the bite of said rolls with said uncoated portion projecting from the side of the web.

ELMER LOVELL SMITH.

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