US2364942A - Duplicating machine - Google Patents

Duplicating machine Download PDF

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US2364942A
US2364942A US435383A US43538342A US2364942A US 2364942 A US2364942 A US 2364942A US 435383 A US435383 A US 435383A US 43538342 A US43538342 A US 43538342A US 2364942 A US2364942 A US 2364942A
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roll
drum
sheet
pawl
machine
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US435383A
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Charles H Bradt
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SCM Corp
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SCM Corp
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41LAPPARATUS OR DEVICES FOR MANIFOLDING, DUPLICATING, OR PRINTING FOR OFFICE OR OTHER COMMERCIAL PURPOSES; ADDRESSING MACHINES OR LIKE SERIES-PRINTING MACHINES
    • B41L11/00Apparatus for directly duplicating from hectographic masters in mirror image, i.e. "wet duplicators" for producing positive copies
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41PINDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2700/00Manifolding, printing or duplicating for office purposes
    • B41P2700/10Hectographic line duplicators

Description

Dec. 12, 1944. c. H. BRADT DUPLICATING MACHINE 3 Sheets-Sheet l Filed March 19, 1942 INVENTDH Emma's 1i BRADT IBYZ a ATTORNEY Dec. 12, 1944. cu. BRADT DUPLICATING MACHINE Filed March 19, 1942 3 Sheets-Sheet 2 T Rm .UR M EH m m Dec. 12, 1944. c. H. BRADT DUPLICATING MACHINE Filed March 19 1942 3 Sheets-Sheet 3 INVE i-1 T UR [711219555 H BRADT ATT URNEY Patented Dec. 12, 1944 DUPLICATING MACHINE Charles H. Bradt, Groton, N. Y., assignor to L. C. Smith & Corona Typewriters, Inc., Syracuse, N. Y.. a corporation of New York Application March 19, 1942, Serial No. 435,383

4 Claims.

The invention relates to improvements in duplicating machines, and more particularly to du-.

plicating machines for making copies by the wet or spirit process of hectographic duplication.

The invention has for its principal object the provision of improved means for feeding and moistening copy sheets in machines of the kind above referred to.

Another object of the invention is to provide an improved moistening means automatically controlled to substantially entirely prevent undesirable application of ink solvent to parts of the machine when no copy sheet is in place to receive solvent from the solvent applying mem ber of the moistening mechanism.

A further object is to provide a spirit process duplicator having an ink solvent receiving and applying roller which is controlled by the copy sheets to apply solvent to each sheet substantially from end to end irrespective of the length of the sheet and to substantially prevent application of solvent by said roller to an opposed sheet feed roller while no sheet is interposed between the applying roller and opposed roller.

A further object is to provide an improved construction of rotary duplicator of the spirit from end to end of copy sheets of lengths equal to or less than the circumference of the master sheet carrying drum or cylinder of the machine, and permitting repeated copying of the matter on the master sheet upon a web of indefinite length.

A specific object of the invention is to provide a spirit process duplicator of the rotary type having solvent applying means with the improved characteristics above pointed out and wherein the time of initial printing contact of a solvent coated copy sheet with a master on a rotating drum of the machine is adjustably variable to initiate such contact at any point around the axis of the drum.

Other objects and advantages of the invenftion will appear from the following description of a preferred embodiment of the invention shown in the accompanying drawings, in which:

4-4 of Figure 3.

process type permitting printing substantially Figure 5 is a fragmentarysectional view taken approximately on the line 5-5 of Figure 1.

Figures 6, 7 and 8 are detail sectional views approximately on the line 6-6 of Figure 2 illustrating the operation of a part of the machine.

The improvements embodying the present invention in its preferred form are shown incorporated in a machine otherwise constructed substantially as disclosed in Patent No. 2,185,188, granted January 2, 1940; to John J. Flanigan. Only so much of the known machine as is necessary for an understanding of the present invention has been illustrated in the drawings and will be described, and reference may be had to said patent for further details of the patented machine incorporated in the improved machine embodying the present invention.

The'main framework of the machine includes a suitable base H] and upstanding left and right hand vertical side walls Ill and I2 rigidly held to said base, The duplicating drum or cylinder I3 is fixed on a drive shaft H which journaled in suitable bearings carried by the side walls of the frame, one of said bearings being shown at is in Figure 2. Shaft I4 is continuously rotated in the direction indicated by the arrow in Figure 1 during operation of the machine, and the drum is provided with a narrow, longitudinal slot I6 in which, in using the machine, the leading end of a master sheet is secured for taking copies from said sheet. The usual platen roll ii is maintained in constant contact with the under part of the drum I3 and is tractively driven by the drum.

A suitable copy sheet feed table I8 is fixedly mounted on base Iii at the forward end of the machine. The rear end of the feed table is located closely in front of the bight of the known pair of superposed introductory feed rolls i9 and 20-of the machine. The lower roll 20 is journaled in the frame for rotation about a fixed horizontal axis. The upper roll i9 is journaled in the known rocking frame 20 for rotation about a horizontal axis, said frame being rockable about a horizontal axis at 22 to raise and lower roll is out of and into contact with roll 20. A spring 23 connected to wall l2 and frame 2| normally tends to maintain roll is in yielding contact with roll 20. The rolls l8 and 20 are formed with the known series of circumferential registering grooves H.

The known series of sheet registering stop fingers .25 are mounted and actuated in the known manner by the known means disclosed in said patent, the forward ends of said fingers working in the grooves 24 of rolls I8 and 20 in the known manner. The supporting and controlling means for the stops 25 includes the usual rocking framev comprising rock shaft 26 iournaled in the side plates, the cross rod 21 swingable bodily by the shaft about the shaft, rock arm 28 fixed on shaft 26 and carrying a tappet 28. A spring 38 connected to arm 28 and plate I2 normally urges rod 21 downward. Stops 25 are loosely mounted on rock shaft 25 with their rear arms urged upward against rod 21 by the usual springs 3| as more fully disclosed in said patent.

The rocking frame 2| carries the usual tappet 32, which tappet and the tappet 28 on rock arm crumed on the frame at 34 and carrying the usual cam follower roll 35 on its rear arm. Lever 33 is rocked by the usual main cam 36 held to shaft I4 to rotate in unison with drum I3. The follower 35 rides on the periphery of cam 36 which has the known long high dwell edge portion 36 and short low dwell edge portion 36 As in the patented machine referred to, a moistening fluid or ink solvent is maintained at a constant level in a trough 31 mounted onithe frame and extending horizontally between plates II and I2 above and rearward of the pair of introductory feed rolls I8 and 28. The known metallic fountain or supply roll 38 is journaled in the side plates for rotation about a fixed horizontal axis 38 with the lower part of the roll within the trough 31. Roll 38 has in its periphery a narrow and shallow helical groove 40. The metallic roll 4| for applying the ink solvent to the copy sheets is, as in the machine of said patent, journaled in a pair of rock arms 42 having pin and slot sliding pivotal connections 43 with the side plates II and I2, and springs 44 anchored to said arms and plates to maintain roll 4| in constant contact with roll 38 and to constantly yieldingly tend to maintain roll 4| in contact with the usual counter-pressure feed roll 45. Roll 45 is journaled in the frame side plates to rotate about a fixed horizontal axis 46, the bight of the superposed rolls 4| and 45 being located to the rear of the bight of the pair of rolls I8 and 28 and forward of the bight of the drum I3 and platen 'roll I'I.

Journaled in plates II and I2 behind roll 4| isa horizontal rock shaft 41 having fixed thereto, and extending forwardly therefrom under the free ends of rock arms 42, a pair of rock arms 48 constantly maintained in contact with arms 42 by a light spring 48 which is of insuflicient strength to overcome the weight of roll 4|, and arms 42 and the pull of springs 44. Extending vertically entirely across the inner face of the right hand rockarm 48 is a channel 5I|.

As in the machine of said patent there is provided a prop coactive with the right hand rock arm 48 under control of a copy sheet detector means constructed as will now be briefly described. A horizontal rock shaft 5| journaled in plates II and I2 has rigid therewith a series or row of copy sheet detector pins or feelers 52 which normally extend upward and rearward from shaft 5| across the path of travel of the copy sheets and in between the stops of the row of copy sheet arresting stops 25 as indicated in Figure 8. Fixed on the right hand end of shaft 5| is a pendent rock arm 53 normally yieldingly held in the position shown in Figures 1 and 8 by alight upstanding prop or lever 55, fulcrumed substantially midway its ends on plate I2 at 55 to swing fore and aft of the machine, has its lower arm connected to arm 53 by a rigid link 51 pivoted to both arms to effect movement of said arms in unison and in substantial parallelism. The upp r end of the prop lever 55 is adapted either to be received freely in channel 58 in right hand rock arm 46 (as indicated in Figure 'I) to permit roll 4| to contact roll 45 (or rather, a copy sheet between said rolls), or to be interposed normally under said arm 48 at the forward edge of channel 58 (as indicated in Figure 8) to prevent roll 4| from moving down into contact with roll 45.

It will be understood that the drum and the various rolls described are driven as and by the means disclosed in the prior patent above referred to, the peripheral speed of all the rolls corresponding to that of the drum. Viewing the machine as in Figure 1., the drum I3, roll 4| and roll I8 have a counterclockwise rotation, whereas the platen roll I'I, roll 38, roll 28 and roll 45 have a clockwise rotation. The drum I3, roll 38 and roll 20 are positively driven continuously from a suitable source of hand or motive power. Roll 4| is constantly tractively driven by roll 38. The platen roll I! is constantly tractively driven by drum I3. Roll I8 when lowered is tractively driven by roll 28, and roll 45 is tractively driven by roll 4| when the latter is lowered.

The new features of construction of the machine illustrated in the accompanying drawings will now be described.

The cam 36 is releasable from shaft I4 for rotative adjustment of the cam in either direction about the shaft relatively to drum I3 through a complete circuit of 360 degrees, and may be locked to the shaft in any rotatively adjusted position within said circuit to change the timing of the machine. The cam 35 is fixed on the inner end of a sleeve 58 freely rotative about shaft I4, said sleeve having a finger knob 58 fixed on its outer end. A friction washer 50, loosely encircling shaft spring 54 anchored to arm 53 and plate I2. An 7 I4 and seated in a circular recess 65 in the outer face of knob 58, is adapted to have pressed tightly thereagainst a flexible friction disk 8| keyed to shaft H by a pin 52. A clamping nut 63, threaded on the adjacent end of shaft l4 and contacting disk 6|, is oppositely rotative to frictionally lock the cam to the shaft to rotate with the shaft or to release the friction grip to permit rotative adjustment of the cam. When locked, the cam and sleeve are pressed against an abutment or collar 64 fixed on the shaft I4 by a pin 65. Suitable graduation marks 51 are preferably provided on the outer face of knob 58 around recess 66 and a coactive graduation mark or pointer line 58 is preferably provided on the exposed outer face of disk 6|. One of the graduations 5'! preferably has the designation 0 associated therewith on the knob as indicated at 58.

Drum shaft I4 extends loosely through a mutilated ratchet wheel I8 and a mutilated rigid disk 'II which are located between wall I2 and cam 35 and are in facewise abutment with the disk located nearest the cam. Ratchet wheel 10 and disk II are coaxial with the drum and cam 36 and are rigidly held to cam 36 to rotate therewith by means of bolt and nut fastenings I2 and spacing sleeves I3. The diameter of the disk II is somewhat less than the diameter of the ratchet wheel at the roots or bases of the wheel teeth. For a short distance therearound the periphery of the ratchet and the periphery of the disk are cut away to within the same distance from their axes to provide axially registering recesses as indicated at I4 located within the angle which includes the low dwell edge portion 36 of cam 38. Immediately in advance of the recess therein, the disk 1| has formed on its periphery a small cam hump l5.

Extending rearward from and fixed to rock shaft 41 at the right hand side of the machine is a rock arm 16 on which is pivoted on a horizontal axis at 11 a normall upstanding pawl or dog 18, the nose 18 of which is engageable with ratchet and is formed on the upper arm of the pawl. The lower arm of the pawl has fixed thereto a laterally extending pin I9 engaged in a longitudinal slot 80 formed in a link 8| which extends rearwardly from and is pivoted at 82 to the upper arm of the prop lever 55, A spring 83 normally urges the pawl about its pivot into a position in which pin 18 is at the rear end of slot 88. Rock arm 16 is provided to the rear of pawl 18 with a laterally extending pin 84 engageable by the upper arm of the pawl to limit rearward rocking of said arm about pivot 11. Journaled on the upper end of the pawl on a horizontal axis at 85 is a small metal roll 86 coactive with the periphery of disk 1 i.

Operation During each revolution of the drum, roll i9 is raised and lowered and stops 25 are moved into and out of sheet arresting position, the stops being out of sheet arresting position while roll i9 is lowered and being in sheet arresting position while roll I9 is raised from roll 20. When no copy sheet is engaged with the sheet detector, the prop 55 remains in the position shown in Figure 8 and the pawl 18 and its roll 86 will thus be held rocked relatively to arm 16 in the position shown in dotted lines in Figure 8 and the solvent applying r011 4| cannot move downward into contact with roll 45. Immediately after roll i9 is lowered, during each revolution of the drum and at a time varying with the rotatively adjusted position with respect to the drum of cam 36, ratchet wheel Ill and disk II, the cam hump engages roll or follower 86 on pawl 18 and rocks shaft 41 as shown in Figure 6 to lift roll 4| still farther to free prop 55 of pressure from the weight of roll 4|. If no sheet has been introduced into the machine, the roll 4| will re-assume the Position shown in Figure 8 after hump 15 passes the roll 86. Consequently, it will be seen that, as long as no copy sheets are fed into the machine, roll 4| will be kept out of contact with roll 45 and roll 86 on pawl 18 will be kept in the path of cam hump 15.

If a copy sheet is introduced into the machine against stops while roll I8 is elevated, the sheet will be advanced upon lowering of said roll and will, while hump I5 is passing roll 86, engage the detector and shift the latter and prop 55 into the position shown in Figure 6 whereupon roll 4| will lower into contact with the leading end of the copy sheet as shown in Figure 7 and will remain lowered until the trailing end of the copy sheet passes from the detector fingers 52. In the position of the parts shown in Figure 7, it will be observed that link 8| is moved rearward into a position in which spring 88 has rocked pawl I8 to move and hold the nose 18 of pawl 18 forward away from ratchet wheel 10 and to move and hold roll 86 forward out of the path of cam hump 15, thus disabling the lifting mechanism for the solvent applying roll until the copy sheet completes its transit past fingers 52.

As soon as the trailing end of the copy sheet passes fingers 62, link 8| will again be drawn forward by the pull of spring 54 to permit eneagement of the nose of the pawl 18 with the toothed periphery of ratchet wheel 10 as indicated in Figure 3, whereupon the rotating ratchet wheel will rock the pawl against pin 84 and depress arm 16 to elevate roll 4| substantially to the position shown in Figure 6 and the detector and prop will then move into the position shown in Figure 8. As the nose of the pawl leaves the ratchet wheel and the pawl assumes the position shown in full lines in Figur 8, arm 48 will lower slightly into contact with the top end of prop 55,

and the roll 86 will engage the periphery of disk H as shown in Figure 8 to retain the pawl in the position shown in Figure 8 for subsequent action of hump 15 on roll 86 and the pawl. The timing is such that roll 4| will lower on the extreme leading end of a copy sheet and will only lift substantially'at the time that the extreme trailing end of the sheet reaches the bight of rolls 4| and 45.

If the trailing end of-a copy sheet or web should pass off of fingers 52 while recesses Hi are passing pawl 18, there will, of course, be a slightly delayed action of the lifting and locking up of roll 4i. Since the disk H and ratchet wheel iii are adjustable bodily with the timing cam 86 relatively to the drum about the drum axis to any angularly adjusted relation to the drum slot it, it will be obvious that the leading end of a sheet may be timed to enter the bight of the drum l3,

and platen roller ill with slot l6 at any rotated position with respect to said bight, but that any copy sheet or web fed into the machine will nevertheless have a continuous coating of ink solvent applied to its upper face substantially from end to end of the sheet or web. If a sheet or web several times as long as the circumference of the drum be fed into the machine, its upper face will have ink solvent applied thereto without interruption no matter how many revolutions of the drum are required to feed said sheet or web between the drum and platen roller for printing,

and said sheet or web will thus be conditioned to receive repeated impressions of the matter delineated on the master carried by the drum.

The registering recesses 14 in the ratchet M and disk free the pawl 18 to assume the position shown in Figure '7 while a sheet is being fed through the machine over fingers 52. If the drum is rotated without feeding copy sheets, the pawl vibrates about its pivot from the position shown in full lines in Figure 8 to the position shown in dotted lines in Figure 8 and back again each time cam hump 15 and the recesses 14 pass the pawl, and link 8| prevents the roll 88 on the pawl from remaining out of the path of hump 15. The contact of roll 86 with disk II also prevent noise which would result if the pawl contacted the ratchet while roll 4| is elevated.

I claim:

1. A duplicating machine of the class described comprising a rotative master sheet carrying drum, a platen roll coactive with the drum, a pair of copy sheet feed rolls for advancing copy sheets toward the bight of the drum and platen roll, means for supplying ink solvent to one of said rolls, means shiftable to separate said feed rolls, a latch normally coactive with said shiftable means to hold the feed rolls separated, means operable by a copy sheet to release said latch as the leading end of the sheet reaches said pair of on said shiitable means normally retracted 1mm said ratchet and movable by said sheet operable means into contact with said ratchet to actuate V the shiitable means to separate the feed rolls as a copy sheet completes its transit between said rolls. a 2. A duplicating machine of the class described comprising a rotative master sheet carrying drum, a platen roll coactive with the drum,"a pair of copy sheet teed rolls for advancing copy sheets toward the bight oi the drum and platen roll, means for supplying ink solvent to one or said rolls, means shiitable to separate said reed rolls, a latch normally coactive with said shiitable means to hold the feed rolls-separated, means operable by a copy sheet to release said latch as the leading end of the sheet reaches said pair oi. rolls, a ratchet rotative with the drum, a pawl-on said shiitable means normally retracted from said ratchet and movable by said sheet operable means into contact with said ratchet to actuate the shiitable means to separate the feed rolls as a copy sheet completes its transit between 'said rolls, and means rotative with the drum and-engageable with the pawl when the feed rolls are separated to relieve binding engagement between the latch and shiftable means at a predetermined point in the revolution of the drum. I

3. In a duplicating machine of the kind having a rotatively driven printing drum and copy sheet feed means periodically operable to advance sheets toward the drum in timed relation to the rotation of the drum, the combination with said the applying roll from the counter pressure roll constantly spring urged toward a position to hold the litter in applier roll elevating position, a copy sheet detector in advance oi the pplier and counter pressure roll and connected with said prop to maintain the prop in ineii'ective position during engagement of a sheet with the detector, and means connecting the prop and pawl to temporarily engage the pawl with the mutilated ratchet, substantially when a copy sheet completes its transit past the detector, to cause liiting of the litter for engagement oi the prop thereunder.

4. In a duplicating machine of the kind having a rotatively driven printing drum and copy sheet feed means periodically operable to advance sheets toward the drum in timed relation to the rotation of the drum, the combination with said drum and feed means of means for moistening each sheet advanced toward the drum by said feed means comprising a moisture applying roll, parallel to and in advance of the drum, an underlying counter pressure roll tor the applying roll rotative about a fixed axi parallel to the drum axis, a litter rockable about a horizontal axis to raise the applying roll from the counter pressure roll and having an arm extending rearward from means limiting swinging oi the pawl in opposition to said spring, a litter prop swingable about 4 the pivotal axis of the litter, a mutilated ratchet wheel rotative with the drum about the drum axis, a pawl pivoted on said am to swing into and out of engagement with said ratchet wheel, a spring normally urging said pawl from the ratchet,

an axis parallel to that of the litter and constantly spring urged toward a position to hold the lifter in applier roll elevating position, a copy sheet detector in advance ofthe applier and counter pressure roll and connected with said prop to maintain the prop in ineflective position 40 during engagement of a sheet with the detector,

and having an arm extending rearward from the pivotal axis of the lifter, a mutilated ratchet wheel rotative with the drum about the drum axis, a pawl pivoted on said arm to swing into and and means connecting the prop and pawl to temporarily engage the pawl with the mutilated ratchet substantially when a copy sheet completes its transit past the detector, to cause litting of the litter for engagement of the prop thereunder, and a mutilated cam rotative with the ratchet and drum and eoactive with the pawl to raise the litter from the prop as a copy sheet reaches the detector.

CHARLES H. BRAIYI'.

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2516613A (en) * 1945-10-22 1950-07-25 Addressograph Multigraph System of setting paper positioning parts on a printing machine
US2518221A (en) * 1945-09-17 1950-08-08 Ditto Inc Sheet positioning device for duplicating machines
US2536606A (en) * 1948-03-15 1951-01-02 Jagger Hubert Master sheet advancing means for duplicating machines
US2539839A (en) * 1945-07-18 1951-01-30 Jagger Hubert Moistening control device for duplicating machines
US2588917A (en) * 1947-01-11 1952-03-11 Arthur H Geib Sheet stop device for rotary duplicating machines
US2622519A (en) * 1947-12-15 1952-12-23 Fixture Hardware Corp Moistening device for motor-driven duplicating machines
US2643607A (en) * 1950-02-03 1953-06-30 Ditto Inc Registration means for duplicating machines
US2661685A (en) * 1949-04-14 1953-12-08 Ibm Card controlled printing machine
US2789497A (en) * 1953-08-28 1957-04-23 American Tag Company Apparatus for printing indicia on a web of connected blanks
US2826141A (en) * 1953-03-02 1958-03-11 Block & Anderson Ltd Sheet feed control means for rotary hectographic copying machines
US2993438A (en) * 1957-06-18 1961-07-25 Old Town Corp Duplicating machines
DE1116692B (en) * 1957-09-16 1961-11-09 Fixture Hardware Corp Means at multipliers for adjusting the top edge of the sheet to be printed
DE1191832B (en) * 1962-12-05 1965-04-29 Rena Bueromaschinenfabrik G M Rotationsvervielfaeltiger for mirror writing-printing forms

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2539839A (en) * 1945-07-18 1951-01-30 Jagger Hubert Moistening control device for duplicating machines
US2518221A (en) * 1945-09-17 1950-08-08 Ditto Inc Sheet positioning device for duplicating machines
US2516613A (en) * 1945-10-22 1950-07-25 Addressograph Multigraph System of setting paper positioning parts on a printing machine
US2588917A (en) * 1947-01-11 1952-03-11 Arthur H Geib Sheet stop device for rotary duplicating machines
US2622519A (en) * 1947-12-15 1952-12-23 Fixture Hardware Corp Moistening device for motor-driven duplicating machines
US2536606A (en) * 1948-03-15 1951-01-02 Jagger Hubert Master sheet advancing means for duplicating machines
US2661685A (en) * 1949-04-14 1953-12-08 Ibm Card controlled printing machine
US2643607A (en) * 1950-02-03 1953-06-30 Ditto Inc Registration means for duplicating machines
US2826141A (en) * 1953-03-02 1958-03-11 Block & Anderson Ltd Sheet feed control means for rotary hectographic copying machines
US2789497A (en) * 1953-08-28 1957-04-23 American Tag Company Apparatus for printing indicia on a web of connected blanks
US2993438A (en) * 1957-06-18 1961-07-25 Old Town Corp Duplicating machines
DE1116692B (en) * 1957-09-16 1961-11-09 Fixture Hardware Corp Means at multipliers for adjusting the top edge of the sheet to be printed
DE1191832B (en) * 1962-12-05 1965-04-29 Rena Bueromaschinenfabrik G M Rotationsvervielfaeltiger for mirror writing-printing forms

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