US1869509A - Duplicator - Google Patents

Description

L. J. SAU ER DUPLICATOR Aug. 2, 1932.

Filed April 15, 1931 5 Sheets-Sheet l fins-21m)": Lam's 0], 15224467 L. J. SAUER DUPLICATOR Aug. 2, 1932.

Filed April 15, 1951 5 Sheets-Sheet 5 I L. SAUER 1,869,509

DUPLICATOR Filed April 15, 1951 5 Sheets-Sheet 4 fil/enfor: Law's J, 152m Aug. 2, 1932. UE 1,869,509

DUPLICATOR -Filed April 13, 1931 5 Sheets-Sheet 5 fiver/f0 r. 02 015 ,Sduer.

"Patented Aug. 2, 1932 UNITED s'rnriazs.

PATENT OFFICE LOUIS J. sauna, or OAK PAR-K, ILLINOIS, ASSIGZNOR fro GHARLES H. JOY, smor CHICAGO, ILLINOIS n-UrLIcAToR Application filed April 13, 1931; Serial No; 529,629.

This invention relates to duplicating machines and more particularly to carriage construction and control including automatic paper feeding and aligning mechanism cooperative therein, with specialreference to that class of machines provided with a flat gelatinized printing surface over which a carriage having a suitable platen roller is arranged to travel.

The invention is particularly adapted for use in connection with machines in which paper or suitable cards may be inserted in the carriage and the platen roller impresses the original or the copy sheet on the gelatinized surface, which latter receives the impression from the original sheet and transfers it to the copy sheet. A structure somewhat similar to that in the present application is disclosed and ciaimed in my copendin g applications Serial No. 457,234, filed May 29,

1930, and Serial No. 486,608, filed October 6 1930. i

In positioning the-original or the copy sheets on the gelatinized surface, it is necessary that the paper be accurately aligned with relation to the platen roller and the printing surface and that the sheets be fed to the gelatinized surface and under the platen roller in such a manner that a suitable margin will result. It is also desirable that means be provided whereby the original may be impressed on the printing surface and large numbers of copy sheets of various thicknesses may thereafter be fed into the machine and automatically positioned relative to the printing surface to provide the same margin on all of the copies regardlessof the difference in thickness.

Heretofore, machines of this type have been unsatisfactory and unreliable and required a separate and careful adjustment for each thickness'of paper in order to retain the same margin; also, when'previous methods are used and stiff cards or paper are inserted in the machine, the sharp edge of the paper causes injury to the gelatin printing surface. p

In my invention I have overcome the above and other objections and have provided an accurate and convenient means for feeding either thin paper or comparatively stiff cards to the printing bed in such a manner that there is no tendency to injure the gelatin 7 surface and have also provided an automatic aligning means for accurately aligning the paper with the impression on the printing bed in such a manner as to provide the same registration thereon regardless of the thicknessof paper used.

The embodiment of my invention, which will be later described in detail, contemplates a duplicating machine having a carriage for movement back and forth over a printing bed, and in which carriage is mounted the usual platen roller, which latter may be auto matically lowered or raised by the lost motion of the carriage handle during the rest periods of the carriage and preparatory to starting or reversing the movement thereof.

Vvhile the platen roller is in the raised posltlon, paper, or a suitable card, is inserted between the platen roller and a yieldable pressure roller where it engages and is aligned by a rotary margin bar arranged to rotate about the platen roller. The handle is then operated preparatory to moving the carriage to perform the printing operation, and the lost motion of the carriage handle simultaneously lowers the platen roller and rotates the margin bar to carry the paper around the platen roller and into substantially parallel alignment with the printing surface, the platen roller being locked during a portion of its downward movementso as to feed the paper by engagement with the yieldable pressure roller.

' The rotary margin bar moves somewhat faster than the paper is fed, and, therefore, the paper will be released therefrom as soon as it has been fed under the platen roller to a position where its release will allow the An especially desirable feature of the present invention comprises a completely auto matic margin-controlling paper feed mechanism, whereby paper or cards, varying greatly in thickness, may be automatically delivered to the gelatinized surface to provide the same margin regardless of the thickness of the paper.

The invention lso includes a compretel automatic platen clutch mechanism, whereby the platen roller may be locked during certain portions of its movement.

A further feature is the provision of a completely automatic margin-controlling paper feed and a suitable margin bar paper guide cooperating therewith, all incorporated in the carriage of the duplicating machine and automatically operable by the single means operating the carriage.

I also provide means whereby thepaperfeeding operation is completed before the movement of the carriage begins and wherein the paper-feeding operation for maintaining the same margin on paper of different thickness is controlled by the same directional movement of the handle controlling the carriage.

My invention also includes a rotary margin bar and paper-aligning means cooperating with an automatic platen control which will automatically guide the paper into aligned relation with the printing surface, thereby preventin injury to the gelatin when the paper is deilivered to the surface and will align the paper to provide the same margin on thick or thin paper.

A further important feature is the provisionof a simple and eflicient means for the locking carriage against forward movement until the platen roll is in operative engagement with the printing bed.

I also provide a novel equalizing means for the platen roller whereby the roller automatically adjusts itself to inequalities in the printing bed and whereby a constant pressure thereon is maintained during the printing operation.

Another object is the provision of convenient means whereby the movable platen roller and its support is automatically locked in either the lowered printing position or in a raised aosition beyond the normal limit whereby t e platen roller may be easily removed from or inserted in the carriage.

Further objects will appear from the detailed description and the appended claims.

In the drawings Figure 1 is a top plan view of a portion of a duplicating machine in which one embodiment of my invention is illustrated;

Fig. 2 is a transverse sectional view through the carriage operating handle. il ustrating the locking mechanism, and taken on a line corresponding to line 22 of 1;

Fig. 3 is a detail transverse section on a line corresponding to line 33 of Fig. 1 and illustrates the intermediate shaft support;

Fig. i is an elevation of the guide rod end of the carriage, the platen roller and aportion of the operating mechanism being shown in dotted lines;

Fig. 5 is a transverse sectional view through the opposite end of the carriage, taken on a line corresponding to line 55 of Fig. 1;

Fig. 6 is a tranverse sectional view through the carriage, taken on a line corresponding to line 6-6 of Fig. 1, with the mechanism shown in position after the platen roller has been moved into contact with the gelatinized surface;

Fig. 7 is a transverse sectional view similar to that shown in Fig. 4;, with the operating parts in raised position;

Fig. 8 is a sectional letailed view through the platen roller bearing and supports. mechanism, taken on a line corresponding to line 8-8 of Fig. 6;

Fig. 9 is a detailed perspective view of the platen roller clutch and platen roller bearmg;

Fig. 10 is a perspective view of the pressure roller connecting link;

Fig. 11 is a perspective view of one end of the margin bar and stop link pivoted thereon;

Fig. 12 is a detailed perspective view of the pressure roller and bearing therefor;

Fig. 13 is a perspective view of the clutch end of the platen roller, the clutch engaging lugs being shown in section on a line corre sponding to line 1313 of Fig. 8;

Fig. 14 is a diagrammatic view illustrating: the relative positions of the operating during the paper feeding operation: and

Fig. 15 is an enlarged diagrammatic view illustrating the locking point of the platen roller to provide the same margin for thicl; or thin paper.

Referring to the drawings in detail the embodiment illustrated comprises a duplicating machine having side frame members 1 and 2 on which is supported a bed plate :3 having a gelatinized printing surface thereon. The gelatinized surface usually comprises a band or ribbon which is wound on spools mounted at each end of the machine and by which the ribbon may be moved over the printing bed and secured in any desired position thereon and then may be wound from one spool to another and stretched over the printing bed to provide a new print surface. The spools are not shown as they form no part of the present invention.

A carriage 5 is supported for longitudinal movement over the printing bed and comprises a rectangular frame 6, which is preferably of comparatively heavy sheet etal. having a downwardly extending bracket T provided with outwardly extending bearings 8. These bearings are formed around a for the accurate movement of the carriage back and forth over the printing bed, and the bearings 8 thereon also allow the carriage t .1 be raised from the printing surface by rotm tion onlthe guide rod. The opposite end of the carriage is supported on the side frame 2 by means of a roller 10 which is pivoted on the end plate of the carriage.

By this construction the carriage h moved back and forth over the printing sui-T face or raised for inspection of the gelatin. A rock shaft 12 is pivotally mounted in the carriage end plates by means of suitable bean ing screws 13 and is provided with arms 14 and 15 secured thereto for supporting a plat-- en roller 16. The rock shaft 12 is also provided with an intermediate bearing support 12a secured to the side frame 6, as shown in Fig. 3,

The platen roller is provided at each end with reduced shaft extensions, as indicat at 17 in Fig. 8. A bearing hole 18 in rock shaft arm 14 is arranged to receive or" of the platen roller shaft extensions 17 and to provide a bearing therefor, The plain roller shaft extension 17 a on the opposite end of the platen is mounted in an open bearing slot 19 in the 15, as shown in Fig. 5, The arm 15 is provided with an arcuate surface 20 whieh is in alignment with a similar arouate surface on a retaining member 21 secured to the end .of the carriage. By this construce t-ion, it will be obvious that when the rock shaft is operated to raise and lower the platen, the shaft extensions 17a will be retained in the bearing slot 19 by means of the arcuate retaining member 21 during the normal movement of the platen roller. Fig. 5 the arm 15 is illustrated in its normal raised posie tion.

When it is desired to remove the platen roller it is only necessary to rotate the rock haf 1 0 raise the pl t n rolle u t th roller shaft extension 1711 is above the surface 22 of the retaining member 21, when the shaft be removed from the bearing slot 1 9 and a the platen may be easily removed from the carriage. In order to operate the carriage over the bed surface and to operate the rock shaft to raise and lower the platen roller, a handle 23 is secured tothe rock shaft 12.

The rock shaft 12 and the arms 14 and 15 thereon provide a movable frame or yoke pivoted on the carriage by means of the bearing screws 13, and the handle 23, being arranged to move this yoke and also providing the means whereby the carriage may be moved over the printing surface. The lost motion between the handle and carriage frame will automatically raise and lower the platen roller. r I

' vIt is desirable that the platen roller should be locked in its lowered position when pressed against the gelatinized surface- The locking means comprises a rod 24 slidahly mounted in the handle 23, as shown in Fig. 2, and nor mally held yieldably in raised position by means of a spring 25 engaging a push button 26 on the rod; an auxiliary spring 27 is also mounted in the handle 23 and arranged to be engaged by the button 26 when more than the normal movement of the rod is desired. The rod 24 extends through the rock shaft 12, and the lower end is slotted at 28 to receive an arcuate rocking plate 29, which latter is rigidly secured to the side plate of the carriage frame 6. The lower end of the rod is also provided with a lug 30, which is automatically engaged in a notch 31 in the plate 29 when the platen roller is lowered to the printing position.

l/Vhen it is desired to raise the roller for the insertion of paper thereunder, the button 26 is pressed downwardly and the lug 30 will thereby be released from the notch 31. The handle is then moved to raise the platen roller until the lug 30 engages a downwardly extending lug 32 on the plate 29. This movement of the lug 30 between the notch 31 and the lug 32 provides the normal lost motion between the platen roller and the carriage, and when the handle is moved to a position to be stopped by the lug 32, the platen roller will be raised to the position indicated in Figs. 5 and 7-.

When it is desired to remove the platen roller, the button 26 is pushed downwardly against the pressure of the auxiliary spring 27 suflioiently to allow the lug 30 to pass be yond and be retained by the stop lug 32, whereby the yoke arms 14 and 15 will be raised and locked above the r normal raised position and the bearing slot 19 in the arm 15 will be retained above the retaining member 21. The platen roller shaft extension 17a may then be removed from the bearing slot 19, and the platen roller may be easily removed from or inserted in the carriage. The normal lost motion of the platen roller, however, is limited by the movement of the looking lug 30 between the notch 31 and the stop In order that the pressure of the platen roller against the printing surface may be anti-clockwise direction the platen roller will be raised by the posture engagement of the arms 33 with the lugs 34. Durlng the operation of the handle to cause the downward movement of the platen roller, the handle 23 will be moved slightly beyond the point of engagement of the platen roller with the printing surface, and in tion of the handle shown in Fig. 2, the springs 35 will be slightly compressed, (Fig. 6) allowing the fre alignment of the platen roller with the printing surface and provlding for a constant pressure therebetween.

The platen roller bearing arm 1a is providcd adjacent the platen bearing with radially disposed, inwardly e. nding lugs 36, and the arm 15 is provided with similar lugs 37 adjacent the bearing slot 19. Tiese lugs extend into slotted openings 33 in suitable pressure roller links 39, and provide a portion of the bearing therefor. i i rotary margin bar 40 comprising a curyed sheet metal plate ll is provided with end plates 42 hay-. ing outwardly extending bearing lugs a3 thereon, which latter also extend into the slotted link openings 33 to complete the hearing therefor. The margin bar end plates 42 are also provided with slots in wh1ch the platen roller reduced extens ons 17 and 17a are engaged, the margin bar being mounted for independent rotation in the pressure roller links 39 by means of the bearing lugs 43. The margin bar is therefore rotatably supported in the links 39 and rotates around the platen roller shaft extensions 17 and 17a, whch latter are engaged in the slots i t.

The rotation of the margin bar is caused by tumbler links one of which is pivoted on each end of the margin bar at d6, the opposite ends of the links being pivoted to the car riage frame at d7. Rearwardly extending portions 48 of the links provide stops for engagement with the rock shaft 12 when the mechanism is in the raised position shown 1n Figs. 5 and 7. The margin bar and cooperating parts retained ri idly in the raised position by ens sent or the end plates 42 with pins 50 on -.ne pressure roller connecting links 39.

A pressure roller 51 1S provided with re duced bearing portions 52 which are engaged in elongated holes 53 in the links 39. The

pressure roller is supported in bushings 54 on the shaft extensions 52. l se bushings extend through elongated slots in the ends of the carriage and are provided with grooved flanges 56, vnich s rin s 57 are engaged to provide yieleing en agement of the pressure roller against the platen roller, the elongated holes in the lin rs 39 allowing a slight movement of the pressure roller when engaged by the platen roller to allow for different thicknesses of incl'ned paper table 58 is secured to the frame substan tially in alignment with the pressure roller.

the locked posi-' The margin bar is provided with a shoulder 59 and a forwardly extending flange 60 to receive and engage a card or paper 61 when it is inserted between the platen roller and the pressure roller, as shown in lat.

It will be noted that when the platen roller is raised from the lowered position shown in Figs. 4 and 6 to the position shown in Fig. 7, the lugs 36 and 37 on the arms 14 and 15, respectively, will be brought into alignment with the restricted portion 62 of the slotted opening 38in the pressure roller link 39, and the platen roller will be raisedout of axial alignment with the margin bar, as shown in Figs. 5 and 7. Simultaneously the link 39 will be raised and the margin bar will be r0- tated by the tumbler links 45 to allow the reduced platen roller shaft extensions to pass upwardly through the slots i l inthe margin bar end plates. All of the margin bar mechanism will be rigidly held in the position shown in Figs. 5 and 7 by means of the springpressed links 39 and the tumbler stop 48, which latter engages the rock shaft 12, the margin bar ent plates engaging the pins 50.

lVhen paper is inserted between the raised platen roller and the pressure roller, it will be engaged against the margin bar, and the handle 23 is then moved forward to lower the platen roller and engage the paper against he pressure roller, the margin bar remaining in raised rigid position until the platen roller is lowered into axial alignment therewith.

In order to provide an automatic means for locking the platen roller during the time that the paper is engaged, I provide a clutch mechanism comprising an arcuate arm 63 pivoted at 6% on the platen roller supporting arm let. A spring 65 is secured on the arm 14 at 66 and engages a rcarwardly extending portion of the clutch arm to normally retain the clutch in engaged position. v The arm 60 is provided with an outwardly extending clutch portion 68 having lugs 69 thereon. These lugs are arranged to engage an outwardly extending flange 70 on the platen roller when the clutch is engaged, and it will be noted that the spring 65 holds the clutch engaged, and prevents the rotation of the platen roller while it is being raised and lowered, except during those portions of the movement when the clutch is disengaged by means which will now be described.

l i hen the platen roller is in its normal raised position, as indicated in 7, the arcuat'e clutch arm 63 is held in disengaged position by means of a roller 71 on the carriage frame. This disengagement of the clutch in its highest position allows the platen roller to be rotated, if desired, or it may be easily rebe engaged at a definite predetermined point approximately coinciding with the engagement of the platen roller with the thinnest paper used in the machine. The paper will then be fed to a predetermined position, after which the pivoted end of the tumbler link 45 engages alug 72 on the clutch portion 63 (Fig. 6), thereby rotating it on its pivot 64 and causing the disengagement of the clutch and allowing the platen roller to rotate in its lowered position and while :in engagement with the printing surface. A pin 65 prevents the displacement of the clutch arm 63 if the handle is operated with the-platen roller removed.

In order to prevent the carriage from moving from its extreme forward position before the platen roller is in a printing position a lock has been provided for engagement with the frame to retain the carriage against a stop 7 3 (Fig. 5), until the platen roller has been lowered, at which time the lock is automatically released and the carriagemay then be moved to perform the printingoperation. The lock comprises a lever 74 pivoted on the frame at 47, and having a downwardly extending portion 75 arranged to engage in a notch 76 in the side frame when the carriage is against the stop 78. A spring 77. tends to retainthe lever 74 in locked position The opposite end 78 of the lever 74; is in a position to be engaged by the arm 14 when the platenroller is lowered into printing position, thereby raising the locking portion 75 out of the notch 7 6, and allowing the carriage to be moved forward. is returned to its original position against 7 the stop 73, the lever 7 4- will be again engaged in the notch. Other notches 7 6 in the side frame 1 may be used, if desired, to control the stopping position of the carriage when it is desired to operate the carriage in various positions relative'to the printing surface.

In order that paper of different thickness may be used in such a manner as to provide the same margin and to accurately align on the gelatinized surface in the same'position relative to the platen roller, it is desirable 7 that the platen roller should look against rotation at the point at which it will'engage the thinnest paper ordinarily used in the machine. This is illustrated in Fig. 15, in which avery thin paper is indicated bythe full lines A and a very thick sheet of paper is indicated by the dotted lines B. It will be obvious from Fig. 15 that if the platen roller 16 is locked, by means of the clutch just described, immediately upon its engagement with the thin paper A, the paper will be fed p means to cause the cooperat ve action of sa d downwardly during the further locked downward movement of the platen roller and the platen roller clutch will be released to prevent further feeding movement of the paper as soon as the paper has been carried by the margin bar around the platen roller to As the carriage a'position where it isin substantial alignment withthe gelatinized surface. It will then be-released and the margin obtained on on the thick paper until it has reached the same point as the point of engagement with the thin paper. At this point the platen roller will be locked and obviously the thick paper will then be fed to exactly the same relative position and will be aligned on the gelatinized'surface in exactly the same marginal relation, as the thin paper.

In practice, the rotating margin bar passes very close to the gelatinized printing surface, thereby carrying the paper-into adjacent parallel relation to the surface, so that when it; is released it does not strike the surfaceat'an angle thereto. In the-drawings the space between the margin bar and the gelatinized surface has been exaggerated for purposes of illustration.

-. In a machine of thistype it is desirable that the platen roller be as light as possible, and I thereforeprovide a hollow construction suitable end 'plates, having the shaft'extensions l7 and 17 thereon, and the tube 79 being covered with a j thin layer of resilient rubber-like material. In some casesthe equalizing feature of the platen roller support is not required, and the yoke arms 14 and 15 may then be secured rigidly to therock shaft 12, and thesprlngs '35 omitted. I

5 While I have illustrated but one embodiment of my invention, it will be obvious that modifications may be made without departing from the spirit of the invention, and I desire, therefore, to be limited only by the scope of the prior art and theappended claims-.'v Having thus describedmy invention, what Patent of the United States is:

I claim and desire to secure byvL 'etters' comprising a thin metaltube 79 supported on L A. device of .the" character described comprising a printlng bed, a carrlage arranged to travel over said bed, means for operating sa d carriage and havlng a lost motion relative thereto, a platen roller movable by said carriage operating means, a pressure roller, a movable margin bar, and clutch means cooperating between said platen roller and said carriage operating position on said 'bed. 7

2. A device of the character described comprising a printing bed, a carriage arpressure roller, a movable margin bar, clutch means cooperating between said platen roller and said carriage operating means to cause the cooperative action of'said rollers and said margin bar to feed sheets of different thickness to the same marginal position on said bed, and resilient equalizing means between said platen roller and said carriage operating means.

3. A device of the character described comprising a printing bed, a carriage arranged to travel over said bed, means for operating said carriage and having a lost motion relative thereto, a platen roller movable by said carriage operating means, a pressure roller, a movable margin bar, automatic means for locking said platen roller against rotation during the lost motion movement, said locking means cooperating with said margin bar to unlock said platen roller adjacent its printing position.

4. A device of the character described comprising a printing bed, a carriage ar ranged .to travel over said bed, means for operating said carriage and having a lost motion relative thereto, a platen roller movable to and from said bed by said operating means, a rotatable margin bar, means for locking said platen roller against rotation during the lost motion movement, and means cooperative with said margin bar to unlock said platen roller for rotation adjacent sa1d bed.

5. A device of the character described comprising a printing bed, a carriage arranged to travel over said bed, means for operating said carriage and having a lost motion relative thereto, a platen roller movable to and from said bed by said operating means, a rotatable margin bar, means for locking said platen roller against rotation during the lost motion movement, means cooperative with said margin bar to unlock said platen roller for rotation adjacent said bed, and means to unlock said platen roller for rotation in its raised position.

v 6. A device of the character described comprising a. printing bed, a carriage arranged to travel over said bed, means for operating said carriage and having a lost motion relative thereto, a platen roller movable to and from said bed by said operating means, a rotatable margin bar, means for locking said platen roller against rotation during the lost motion movement, means cooperative with said margin bar to unlock said platen roller for rotation adjacent said bed, and means independent of said operating means to unlock said'platen roller .for free rotation in its raised position.

7. A device of the character described comprising a carriage frame, a platen roller yoke mounted for relative movement therewith, a platen roller mounted for rotation on saidyoke, a margin bar rotatable around said platen roller during said lost motion, a

riage movable over said bed, a platen roller on said carriage and movable into and out of operative relation to said bed, a pressure means for paper engaging cooperation with said platen roller, a margin bar movable under said platen roller, and means cooperating between said margin bar and said platen roller to control the marginal relation of paper of difierent thickness on said printing bed.

9. In a duplicating machine of the character described, the combination with a print ing bed or" a carriage movable over said bed, a platen roller on said carriage and movable into and out of operative relation with said bed, a margin bar movable relative to said platen roller, means a for locking said carriage relative to said bed, and a single means for controlling all of said operations.

10. In a duplicating machine of the character described, the combination with a printing bed of a carriage movable over said bed, a platen roller on said carriage and movable into and out of operative relation'with said bed, a margin bar movable relative to said platen roller, means for locking said carriage relative'to said bed, and a single means having a lost motion relative to said carriage for controlling all of said operations.

11. In a duplicating machine, a carriage arranged to travel over a printing bed, a carriage operating handle having a lost motion in the direction of movement of said carriage, a platen roller arranged to be raised and lowered by the lost motion of said handle, a pressure roller cooperating with said platen roller to feed papertherebetween during the downward movement of said platen roller, a rotary margin bar, means cooperating bet'wee said margin bar and one of said rollers and controlled by said handle for controlling the marginal relation of sheets of paper fed to said bed.

12. A device of the character described comprising a printing bed, a carriage arranged to travel over said bed, a rock shaft pivoted for lost motion relative to said carriage, arms on said rock shaft, a. platen roller pivoted on said arms for movement therewith, clutch means on one of said arms and cooperating with said roller to lock said roller against rotation, a rotary margin bar pivoted in substantially axial alignment with said roller and having a lost motion relative thereto and arranged to be raised and lowered with said roller, a tumbler linkfor rotating said margin bar, said link operating to disengage said clutch when said roller is adjacent said bed, a single handle for operating said rock shaft and said carriage.

13. In a duplicating machine 01 the character described, the combination with a printing bed 01" a carriage movable over said bed, a platen roller on said carriage and movable into and out of operative relation with said bed, a margin bar movable relative to said platen roller, and means for operating said platen roller and said carriage, means responsive to the position of said operating means and operative during a material range of movement of said operating means for locking said carriage relative to said bed.

14:. In a duplicating machine of the character described, the combination with a printing bed of a carriage movable over said bed, a platen roller on said carriage and movable into and out of operative relation with said bed, a margin bar movable relative to said platen roller, means for operating said platen roller and said carriage, and means responsive to the position 01": said operating means and operative during a material range of movement of said operating means for locking said carriage relative to said bed, said operating means having a lost motion relative to said carriage.

15. A device of the character described comprising a printing bed, a carriage arranged to travel over said bed, means for moving said carriage and having a lost motion relative thereto, said carriage moving means having a platen roller journaled therein, and means controlled by said carriage moving means and operative during a material portion of the range of lost motion of said carriage moving means for locking said carriage relative to said bed.

16. A device of the character described comprising a printing bed, a carriage arranged to travel over said bed, means for moving said carriage and having a lost motion relative thereto, and means operative during a material. portion of the lost motion of said carriage moving means for locking said carriage relative to said betl and for antomatically unlocking said carriage at a predetermined point in the range of lost motion of said carriage moving means.

17. A device of the character described comprising a printing bed, a carriage arranged to travel over said bed, means for moving said. carriage and having a lost motion relative thereto, means operative during a material portion of the lost motion of said carriage moving means for locking said carriage relative to sand bed and for automatically unlocking said carriage at a predetermined point in the range of lost motion of said carriage moving means, and means for locking said carriage moving means in one of its extreme lost motion positions.

18. In aduplicating machine of the character described, the combination with a printing bed of a carriage movable over said bed, a platen roller on said carriage and movable into and out of operative relation with said bed, means for operating said plat-en roller and said carriage, and means responsive to the position of said operating means and operative during a material range of movement or" said operating means for locking said carriage relative to said bed.

19. In a duplicating machine of the character'described, the combination with a printing bed of a carriage movable over said bed, a platen roller on said carriage and movable into and out of operative relation with said bed, means for operating said platen roller and said carriage, and means responsive to the positlon of said operating means and op era-tive during a material range of movement of said operating means for locking said carriage relative to said bed, said operatin means having alost motion relative to sai carriage.

20. In a duplicating machine of the character described, the combination with a printing bed of a carriage movable over the bed, a platen roller on said carriage and movable into and out of operative relation with said bed, common means for moving said platen roller into and out of operative relation with the bed and moving the carriage over the bed comprising a handle on the carriage having a lost motion rocking movement for moving the platen roller into and out of operative relation with the bed, and means for locking the carriage in its home position released by the rocking movement of the handle, said locking means being eitective to lock the carriage in home position until the platen roller is in operative relation with the bed.

21. In a duplicating machine of the character described, the combination with a printing bed of a carriage movable over said bed, a platen roller on said carriage and movable into and out of operative relation with said bed, common means for moving said platen roller into and out of operative relation with the bed and moving the carriage over the bed. and means controlled by said common operating means for locking said carriage in its home position,said locking means being effective to hold the carriage in its home position until the platen roller has been moved substantially into operative relation with respect to said bed.

22. Ina duplicating machine of the character described, the combination with a printing bed of a carriage movable over said bed, a platen roller on said carriage and movable into and out of operative relation with said bed, means for operating said platen roller and said carriage, a margin bar for positioning the sheet on the printing bed, and means responsive to the position of said operating means and operative during a material range of movement of said operating means for locking said carriage relative to said bed.

In wltness whereof, I have hereunto subscribed my name.

LOUIS J. SAUER.

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