US3641412A

US3641412A - Motor control circuit for pad holder

Info

Publication number: US3641412A
Application number: US84669A
Authority: US
Inventors: Chusaku Hayashi
Original assignee: HAYASHI SEISAKUSHO CO Ltd
Current assignee: HAYASHI SEISAKUSHO CO Ltd
Priority date: 1970-06-15
Filing date: 1970-10-28
Publication date: 1972-02-08
Anticipated expiration: 1989-02-08

Abstract

A writing pad holder is disclosed which incorporates an automatic feed control mechanism for feeding a length of pad from its roll, said mechanism including an electrical switch operable to start and stop a drive motor, said switch being associated with a switching gear and adapted to close during a full cycle of revolution of the switching gear.

Description

United States Patent [151 3,641,412 Hayashi Feb. 8, 1972 [54] MOTOR CONTROL CIRCUIT FOR PAD [56] References Cited HOLDER UNITED STATES PATENTS [72] Invenm" Hayash" Japan 3,101,913 8/1963 Davis ..226/134 x [73] Assignee: Hayashi Seisakusho C0,, Ltd., Sumida-ku, 3,277,356 10/1966 Kraft et al ..318/466 X Tokyo, Japan 3,381,867 5/1968 Konel ..318/470 X [22] Filed: 1970 Primary Examiner-Benjamin Dobeck [21] Appl. No.: 84,669 AttorneyNolte and Nolte {57] ABSTRACT [30] Foreign Application Priority Data A writing pad holder is disclosed which incorporates an auto- June 15, 1970 Japan ..45/59334 matic feed comm] mechanism for feeding a length of pad from its roll, said mechanism including an electrical switch operable [52] US. CL ..3l8/470, 226/ 134 to Start and Stop a drive motor, Said Switch being associated [51] Int. Cl. ..G05d 3/06 with a switching gear and adapted to dose during a f ll cyde [58] Field of Search ..318/466, 468, 470; 226/134, f revolution fth Switching 4 Claims, 6 Drawing Figures PATENTEDFEB 8 I972 3.641.412

SHEET 1 Bl" 3 I NVEN TOR.

BY CHUSAKU HAYASHI Mac la/W Mnlzmsys PATENTEU FEB 8 I972 SHEET 2 BF 3 I NVEN TOR.

BY CHUSAKU HAYASHI had? M1 Mu M! o nlvny PAIENTEBFEBa m2 3.641.412

sum 3 or 3 INVENTOR.

BY CHUSAKU 'HAYASHI www HTT RA/EYEI MOTOR CONTROL CIRCUIT FOR PAD HOLDER This invention relates to a stationary device and more particularly to a memorandum pad holder of the type including an automatic feed control mechanism for feeding a predetermined length of pad at a time from a roll of paper.

The present invention has for its object to provide a new, useful device of the class described which is simple in con struction and accurate in performance.

This object and features of the invention will be better understood from the following description taken in connection with the accompanying drawings which illustrate a preferred embodiment and in which drawings:

FIG. 1 is a perspective view of a memorandum pad holder embodying the invention; 2

FIG. 2 is a longitudinal cross-sectional view of the same;

FlG. 3 is a plan view of part of the holder;

FIG. 4 is a cross-sectional view taken on the line IVlV of FIG. 3 illustrating a drive transmission mechanism employed for feeding a pad;

FIG. 5 is a cross-sectional view of part of the transmission mechanism taken on the line V-V of FIG. 4; and

FIG. 6 is a schematic view utilized to explain the electrical connections of the automatic feed mechanism.

Referring to FIGS. 1 and 2, there is shown a memorandum pad holder 10 which generally comprises a casing 11 provided with a pair of opposing support arms 12 projecting rearwardly of the casing and adapted to support a winding shaft 13 rotatably therebetween, which shaft has wound thereon a roll of writing pad 14. The casing 11 has removably connected thereto a writing bed 15 which is slightly tilted downwards toward one end of the holder and which has a rise portion 15' at the opposite end. An enlarged compartment 16 is formed in the interior of the casing 11 by the rise portion 15' of the bed 15, sidewalls 17, rear wall 18 bottom wall 19 of the casing and adapted to accommodate therein a motor drive and its associated transmission mechanism as shown in FIG. 4 and described hereinafter. A support member 20 is secured to the bottom 19 of the casing 11 and has two opposed projections 20 for connecting a pressure plate 21 pivotally thereon. The support member 20 further has internal therewith a pad guide 21' extending between the rear wall 18 and the lower end of the rise portion 15' of the bed 15.

A feed roller 22 which may be made of for example rubber, is fixedly mounted on the shaft 23 which is joumaled in suita ble bearings between the sides of the support member 20. There is provided a spring 24 for normally urging the pressure plate 21 into frictional engagement with the feed roller 22, so that rotation of the roller 22 frictionally feeds the pad 14 to the writing bed 15. The pad 14 is passed through an opening 25 in the rear wall 18, between pressure plate 21 and feed roller 22, along the guide member 21 and through another opening 26 onto the bed 15 as seen in FIG. 2.

A drive and transmission mechanism employed according to the invention for effecting rotation of the feed roller 22 comprises a motor M, a first transmission gear assembly 27 coupled to the motor and including a large gear 27 and a small gear 27" coaxially mounted on a shaft 28, and a second transmission gear assembly 29 driven by the first gear assembly and including a large gear 29' and a small gear 29" coaxially mounted on a shaft 30 coupled to the feed roller shaft 23. As seen in FIG. 4, the large gear 27' of the first assembly 27 is in driven engagement with the drive gear of the motor M and the small gear 27" is meshed with the large gear 29' of the second assembly 29. The transmission mechanism further includes a switching gear 31 rotatable on its shaft 32' and disposed in meshing engagement with the small gear 29" of the second transmission gear assembly 29. The switching gear 31 has a predetermined gear ratio related to the small gear 29" such that a revolution of the gear 31 determines the length of the pad 14 to be fed.

As shown in FIG. 5, the switching gear 31 is provided on one side thereof with an electrically conductive disc plate 32 and an electrically nonconductive or insulating disc plate 33 interposed between the switching gear 31 and the conductive disc plate 32. The conductive disc plate 32 is provided with a cutaway recess 34 through which recess part of the insulating disc 33 is exposed for contact with a contact strip 35 extending from the motor frame 36.

There is provided a switching element 37 such as of a resilient metal secured on the top of the motor frame 36 and disposed in abutting relation to and normally urging a pushbutton 38 into its upward position as shown in FIG. 4. Depressing this pushbutton brings the element 37 into contact with a projection 39 extending upright from the motor frame 36, whereupon the motor circuit is closed to start the motor M. Thus, starting the motor M drives the various transmission gears already described including the switching gear 31 and causes the contact strip 35 to be released from the recess 34, hence from the insulator 33, and to come into contact with the conductive disc 32. The motor energization circuit is arranged so that it closes upon engagement of the contact strip 35 with the conductive disc 32 and opens when the contact strip 35 is disengaged from the conductive disc 32 and engaged with the insulator 33 exposed through the recess 34. Accordingly, the motor M is kept energized as long as the contact strip 35 remains in contact with the conductive disc 32, even with the pushbutton 38 released. In other words, the duration of energization of the motor M corresponds to the time required for the switching gear 31 to complete a substantially full cycle of revolution. This arrangement is schematically illustrated in FIG. 6 wherein the

contact elements

37 and 39 associated with the pushbutton 38 form a first switch to open and close the motor circuit, and the

contact elements

35 and 32 form a second similar switch in parallel to the first switch. The first switch is actuated upon depression of the pushbutton 38 to start the motor M, whereupon the switching gear 31 begins to rotate clockwise in mesh with the small gear 29" of the second gear assembly 29 which in turn rotates the feed roller 29 counterclockwise to feed the pad 14. Simultaneously as the switching gear 31 rotates, the contact strip 35 engages with the conductive disc 32 to hold the motor M in its energized state. This permits the pushbutton 38 to be released immediately after it is depressed.

It will be appreciated that the length of the pad 14 desired to be fed at a time may be determined by the gear ratio of the switching gear 31 related to the small gear 29" of the second transmission gear assembly.

Designated at 40 is a battery connected to the motor M, and at 41 is a pad retainer which may be, if desired, provided with a cutting edge for cutting the pad 14 therealong.

Having thus described the invention, it will be understood that the invention is not to be limited to the specific form and construction herein advanced, but various changes and modifications may be made therein without departing from the spirit and scope of the appended claims.

What is claimed is:

1. A memorandum pad holder including an automatic fecd control mechanism which comprises a feed roller disposed in frictional engagement with a pressure plate for feeding a writing pad therebetween, a motor for driving said roller, a first transmission gear assembly coupled to said motor and having a large and a small gear, a second transmission gear assembly operatively associated with said first assembly and having a large and a small gear, a switching gear engaged with said small gear of the second assembly and having an electrically conductive area and an insulating area, a first switching circuit, and a second switching circuit parallel thereto, said second switching circuit including a contact strip disposed in abutting relation to said areas of the switching gear, whereby the motor is energized when said contact strip engages said conductive area and deenergized when said contact strip engages said insulating area.

2. The device as defined in claim 1 wherein said first switching circuit is operatively associated with a pushbutton for opening and closing the motor energization circuit.

and an electrically insulating disc member interposed between said gear and said conductive disc member, said conductive disc member having a recess through which to expose part of said insulating disc member for engagement with said contact strip.

Claims

1. A memorandum pad holder including an automatic feed control mechanism which comprises a feed roller disposed in frictional engagement with a pressure plate for feeding a writing pad therebetween, a motor for driving said roller, a first transmission gear assembly coupled to said motor and having a large and a small gear, a second transmission gear assembly operatively associated with said first assembly and having a large and a small gear, a switching gear engaged with said small gear of the second assembly and having an electrically conductive area and an insulating area, a first switching circuit, and a second switching circuit parallel thereto, said second switching circuit including a contact strip disposed in abutting relation to said areas of the switching gear, whereby the motor is energized when said contact strip engages said conductive area and deenergized when said contact strip engages said insulating area.

3. The device as defined in claim 1 wherein said switching gear has a predetermined gear ratio related to said small gear of the second assembly which ratio determines the length of the writing pad to be fed.

4. The device as defined in claim 1 wherein said switching gear further includes an electrically conductive disc member and an electrically insulating disc member interposed between said gear and said conductive disc member, said conductive disc member having a recess through which to expose part of said insulating disc member for engagement with said contact strip.