US2083043A - Reverse motion stop for duplicators - Google Patents

Description

June 8, 1937. F. w. STORCK REVERSE MOTION STOP FOR DUPLICATORS Filed May 12, 1956 Patented June 8, 1937 UNITED STATES REVERSE MOTION STOP FOR DUPLICATO-RS Frederick W. Storck, Arlington, Mass, assignor to Standard Mailing Machines Company, Everett, Mass, a corporation of Massachusetts Application May 12, 1936, Serial No. 79,296

Y 4 Claims.

This invention relates to duplicators of the type having a printing cylinder or platen with a clamping device forsecuring a master copy to the platen and the printing platen is stopped at an initial point after each cycle of operatiomand the invention more particularly relates to an automatic reverse motion stop which is effective to stop the platen-at a determinate posi 'tion other than its initial point and effective only when the platen is rotated .contra to its normal direction of operative rotation. 7 r

' Duplicators of the herein referred to character are provided with arotary printing cylinder or platen which is provided with a clamping device adapted to secure a master copy to the platen. The platen is intermittently rotated and its stopping point between cycles so positioned that clear sheets to be duplicated upo-n may be fed toregisterin engagement with ,the master copyupon subsequent rotationof the platen. A duplicating machine of this character is shown in my Re-issuelatent: No. 19,951.

Accomplishment of thisr desired function of feeding the'clear sheets for registering engagement with the master copy requires an arrangeter will be close to the path of the advancing end of the clear sheet so as to register therewith with a minimum top margin when the master copy and clear sheet are engaged together in the'bight fo med by the platen and its coacting pressure roller. which engages the clear sheet under pressure with the master copy. The usual required arrangement of the machine elements to obtain the above function in a desired and efficient sequence does not readily lend itself toconvenience as the plateniclamp, when stopped in its normal dwell position for the beginning of a cycle, is either in an inaccessible position orii n a position not readily exposed for the purpose of properly attaching the: master copy or removing the same from the clamp without interference. j

When the master copy is to beattached or removed, in machines having these aforementioned elements so arranged, the operator rotates the drum until the clamp is in an exposed or desired position with the master copy free from contact with the pressure roller. I Y

In performing this positioning operation; the platen is usually rotated contra to its normal direction of operative rotation and its stopping point controlled by the operator, therefore; care operator to stop the clamping device in the desired o-r exposed position. This positioning operation is further inconvenienced when theduplicator is operated by motor or like power and at a relatively high speed Under these circumstances, unless theoperato-r isalert, the platen will continue rotating until it is again engaged in its dwell period.

It is obvious that speed, convenience and simplicity in ope-ration are of 1 vital importance in duplicating machines of the herein referred to character. I

Therefore, a primary object of my inventionis to provide a simple and eflicient positioning stop for a duplicator printing platen which will-be effective toarrest rotary movement of the platen in one direction'only and at apoint other than its operating cycle dwell period, and whereby the clamping device may be positioned for conveniently attaching or detaching the master copy.

Another object 'of-"my present invention is to provide a stop device of a rugged construction with a minimum number of working parts.

.With the above and other objects in view, my invention comprises a novel construction and arrangement of parts hereinaftendescribed and more. specifically pointed out in theappended claims. I 11 r In the. accompanying drawing I have illustrated a preferred form of my automatic stop device, embodied with aportion' of a rotary duplicator; sufficient toenable those skilled in the art to understand the construction and operation thereof. 7 I

Referring to the drawing: 7 Fig. 1 may be termed a right hand end elevation of'a portion of'a rotary duplicator with my stop'devi'ce embodied'therewith. In this view one 'end frame is omitted'and the master copy clamp is shown as it is positioned duringthe automatic dwell period of the duplicator. 1

Fig. 2 may be termed a left hand end elevation of the parts substantially as shown at Fig. 1, and in this view the. mastercopy clamp is shown arrested inits opposed position. Also, in this view the master .copy clamp is indicated by broken lines in its position corresponding'to that shownatFig.1.

Fig. 3 is a view of a portion of the elements illustrated at Fig. 2, but shows my stop. device in a different position, and

'Fig. 4 is substantially a plan view of the parts as shown at Fig. 2;

The duplicating machine rotation in suitable bearings in the side frames.

The printing platen II is provided with a suitable clamping device I3 for holding the endof the master copy. .M A pressure roller I4 engages the peripheral face of the platen I I and is mounted upon a'sha'ft I5 which is journalled at its ends in suitable bearings in the side frames: -t

The duplicator drive In this instance, the mechanism for-intermittently rotating the printing platen includes an intermittent gear I6 which -iscontinuously..ro-

tated in any suitable manner. This intermittent gear I6-meshes with a coacting intermittent gear H which is securedto the drum of: the platen II. The intermittent gears I6, I! are ofthe usual construction wherein a predetermined portion of the periphery ofeach is free from teeth and continued rotation of the-gear I6 will not rotate the gear 'I'I until the blank space in the gear I6 has passed the blank space in the coacting gear I1 and the teeth in both enmesh.-

Fora duplicatingcycle theintermittent driv- D ing gears I6, I'I rotate the platen II in the ditioned automatic dwell period in the cycle of operation, and thus, during the dwell period, the end of the mastercopy m, which isclamped at I3a,v by the clamp I3; is determinately positioned relative to the bight I Ia formed between the platen- I I and its coact ing pressureroller- I4, see Fig. 1. z.

As the clear sheets to be duplicated. upon are advanced inthedirection of arrow -s, Fig.1, by feeding mechanism (not shown).,;the platen II is rotated so that the master m and clear. sheet meet in registering engagement in the bightalla. of the pressure roller I 4 and platen I I. This side, to which the clear sheets are fed for engagement with the master copy, may be conveniently termedthe feeding side of the platen II.

A duplicating machinehaving theabovecharacteristics is fully shown and described in my aforesaid patent, therefore, further detaileddescription of the complete machine and the operation thereof is thought unnecessary. Further, it is to be understood that my invention;.is,not to be limited to a duplicating machine of the above specific construction and arrangement of parts which have been shown for thepurppse of illustrating an embodiment of my reverse motion stop.

The reverse motion stop 75 a slight rotary movement to be imparted to the rection of arrow at and effect a determinate posi-' roller and thus reduces possible wear which might be occasioned by the continued intermittent engagement of the arms with the roller.

The longer arm 20a, of the lever 20, projects into the path of a stop stud 24 which is secured to the platen II, in a positioned relation to the master clamp I3, and rotated therewith. In this instance, the stud 24 has a resilient roller freely mounted thereon which is adapted to en- ;gage with the lever arm 20a.

Operation of the reverse motion stop As aforesaid, the platen II, in its operating cycle, is stopped with the clamped end of the master properly positioned for registering engagement with an advancing clear sheet which is to be duplicated upon and, in this instance, as

' illustrated at'Fig. 1. During this operating cycle of duplicating, the platen is rotated in the direction of arrow (1 and, as the stop roller 25 engages with the arm 20 this arm is lifted upwardly out of its engaging path. Upward movement of the arm 20a is limited by engagement of the arm 201) with the roller 22', see Fig. 3. As the platen I I continues its rotary movement, the roller 25 releases'the arm 20a-which is then permitted, in this instance through its own weight, to return to its normalposition in engagement with the roller 25 with the arm 20a again extending into the path of the stop roller 25.

When it is desired to removeor secure a master copy to the platen, the platen is conversely rotated, in the direction of arrow 12, until the stoproller 25 is engaged withthe arm 20a,'see Fig. 2, and arrests further rotative movement of the-platen I I and thus positions the clamp I3 where the master copy may be conveniently attached or detached.

- It is obvious that thisjreverse motion stop must be positionedand effective during the interim of the continuedrotation' of the platen II, therefore, inthe hand operated type of duplicator, 'uponengagement of thereverse motionstop, the operator merely ceases operation of the'm'anual means. In the power driven type of duplicator,- as the platen is locked during its reverse motion, it is obviousthat the power belt .or' connectionmust be arranged or permitted'to slip until'the power is disengaged by the operator. I

Excessive shock to the working parts during the stopping of the reverse motion is prevented to a degree by means of the resilient stop rollers 22 and 25 with which the lever locks during this stopping function; f'Having thus described my invention, what I claim is:

1. 'A rotary duplicator having a printing platen with means for securing a master copy thereto andmeans for rotating said platen in converse directionswithf a determinate positioned dwell period in its cycle of rotation, a substantially U'-sha'ped lever pivotally secured relative to the end of said platen, the opposed-arms of said lever being of unequal length, a limiting member disposed between said arms to limit the pivotal movement of said lever, a projection associated with said platen and'rotated therewith in an engaging path relative to one arm of said lever that is normally disposed in the path of said projection and in a manner whereby said arm is;.displaced, when said platen is rotated in its normal operative direction, and said arm is operatively engaged between said limiting. members and said projection when said platen is conversely rotated, and whereby rotative movement of said platen is arrested in a. second determinate position.

2. A rotary duplicator having a printing platen with means for securing a master copy thereto and means for intermittently rotating said platen in opposite directions with a determinate positioned dwell period in its cycle of rotation, in combination with a member having a limited pivotal movement and cooperating with a stop member which is associated with said platen, said first member continuously engaging in the path of said stop member and said members being adapted to operatively engage to arrest rotative movement of said platen when said platen is rotated opposite to its normal operative direction and at a point other than said dwell period.

3. A rotary duplicator having a printing platen with means for securing a master copy thereto and means for conversely rotating said platen with a determinate positioned dwell period in its cycle of rotation, a stop associated with said platen and. a coacting' member for said stop which is continuously disposed in the path of said member and adapted to arrest rotative movement of the printing platen at a point other than the position of said dwell period when said platen is rotated opposite to its normal operative direction, said stop and member being disposed to permit a free continued rotation of said platen in its normal operative direction.

4. A rotary duplicator having a rotative printing platen with means for securing a master gage in the pathof an element of said platen to arrest movement thereof and independent of said dwell period, only when said'platen is rotated opposite'to its normal operative direction.

FREDERICK W. STORCK.

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