US1374253A - Offset-preventing mechanism for printing-machines - Google Patents

Offset-preventing mechanism for printing-machines Download PDF

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US1374253A
US1374253A US189935A US18993517A US1374253A US 1374253 A US1374253 A US 1374253A US 189935 A US189935 A US 189935A US 18993517 A US18993517 A US 18993517A US 1374253 A US1374253 A US 1374253A
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sheets
sheet
offset
pile
cylinder
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US189935A
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Tornberg Isidor
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R Hoe and Co Inc
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R Hoe and Co Inc
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F23/00Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B41F23/06Powdering devices, e.g. for preventing set-off

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  • rsrnon 'ronNBnne or nw Y OItK, Y., 'ASSIGNOR r0 anon :AND 00., or New YORK, N. Y., n conrona'rron or NEW YORK.
  • PatentedvApri 12, 1921 are PatentedvApri 12, 1921.
  • It 1s one object of the present. invention toproduce a construction whereby 'ofl'set sheets may be fed from a pile or other suitable source of supply, so that a fresh sheet shall be presented between the printed web or sheet and the impression cylinder at each lIIlPIBSSlOIl, the offset sheet, after it has been printed aga nst, being returned to the pile and a fresh sheet substituted, a sufficient number of sheets being used in rotation and a 'suflicient number of sheets being provided, so that they will have time to sufficiently dry before they are again presented to the printed web or sheet.
  • It 1s a further object of the invention to provlde a feeding mechanism for feeding ofi'set sheets, which may be loaded while the work 1s going on, so that the feeding canbe contmuous and no time lost and no stoppage of the'machine for changing the feeding dev1ces 1s required.
  • Figure 1 is a diagrammatic side elevation of a rotary web perfecting press embodying the invention
  • FIG. 2 is a detailside view showing the run of the offset sheets through the feeding "mechanism, the feeding mechanism being that shown-in ,Fig. 1;
  • Fig. 3 is a side elevation diagrammatically showing a'rotary printing machine in which the sheets are cut from the web before being rinted and perfected, nd embodying the invention
  • F igpt is a, detailfside elevation showing one form of switch mechanism which may D M mechanismsmay be employed for effect ng be employed to prevent a worn or dirty sheet from being returned to theimpression mechanism may vary wldely. in its specific cylinder;
  • Fig'. 5 is a sectional view, partly broken away,'showing an impression cylinder and construction.
  • Fig. 7 is a side View, partly in secti'onfof the construction shown in Figs. 5 and 6, and,
  • Fig. 8 is a view showing'the impression cylinder and arrangement where the machine shownin Fig. 8 isemployed for printing] I and perfecting sheets cutfrom a web.
  • chine in which a continuous web is printed and perfected and then led to other mechanisms in'whi'ch it is cut or folded.
  • Thevaor suitable co nstruction Suitably supported.
  • the particular machine illustrated in Fig.1 is'a'rrangedto print in'one color onone side, of the web: and to perfect a web in two colors.
  • Inking mechanisms 9 of any usual type are provided :In machines embodying the invention, there will be provided a mechanism for feed ing-offset sheetsibetween the freshly printed side of the, web and theimpressioncylinder of the second all perfecting printing couple, and in machines embodying the invention in its besii form these offset sheets will be'fed. cohtinupuslj and by mechanism which can be load dwhile the machine'is. worki'n'g,”so
  • a presser foot 12 being "provided as. usual a common one and 'of itself forms no part of the invention.
  • sheet takingadevicescar ri'ed by the second impression cylinder The sheet taking devices ma'ybeof any suitable character. In the particular construction illustrated, these sheet taking devices arev mountedjfo n a shaft 16 suitably positioned within the cylinder, this shaft being carriedv are fedfrom theifeedei" ifeed table 10 ,which is suitably located closely; adjacent the second impression cyl-. Jinder 7. The'sheets are fed from this table 'so that the undersheet ofthe pile is first de- A 7 livered or fed to the-impression cylinder,
  • the second impression'cyli-nder is twice the diameter of the two 'form cylinders with;which itcotiperates, this cylinder will, as s'hoWn in'Fig, 1,-be provided -with we sets of oifset sheet takinggrippers which identical in construction and operation, "the two sets'of grippersbeing provided so that the freshv sheet may be fed for each im 'pressiong It may bestated that the i'mpression cylinder is as'usual provided with any impression blanket indicated at' l8 (Figs. 5- 'and -'.6),' the "ends of which extend into the.
  • the oifset sheet After the oifset sheet has been passed "with. the web throu h the machine, it is delivered from the cy inder back onto the top of the pile on the feed table 10 over suitinvention in its best form means will beprovided for pushing. or lifting the end of the offset sheet from the cylinder to insure v the sheet passing to the guide before referred to, over which the sheet is delivered to the table.
  • a worn or too badly soiled sheet may be prevented 'from again passing through the machine from the feeder, such worn or soiled sheet being removed as it is delivered to the top of the pile by the guide.
  • Various devices may be employed for such purpose, but a convenient one is that illustrated in Fig. 4 inwhich there is shown a receptacle 30 mounted in any suitable manner adjacent the feeding mechanism.
  • This receptacle has an open end and at the open 'end is provided a switch 31 pivotally mounted on a stud 32, the switch being operated by hand lever 33.
  • the operator simply throws this'switch into the position shown in Fig. .4, which causes such sheet to be delivered to the receptacle 30,
  • Figs. 3 .and 8 is shown a construction in which the .web is cut into sheets after be-- ing printed upon.
  • Such construction in addition to the mechanisms hereinbefore described, includes a pair of cutting cylinders 38, 39, sheet feeding mechanism 40, and ad ditional sheet taking devices which are shown as grippers 41, are provided, on the 'second impression cylinder for holding the cut sheets thereon.
  • V 1 In a printing machine, the combination with a printing eouple, of'a pile of offset sheets, and means for feeding offset sheets continuously thereto from the bottom of the pile, one such sheet being fed for each im-- pression operation of the impression member of the couple.
  • the combination with an impression cylinder of means for supporting a pile of ofi'set sheets, means for feeding the sheets successively to the impression cylinder, one sheet being fed for each impression'operation thereof, and means for returning-the sheets to the pile.
  • the combination with an Impression cylinder, of means for 1 supportin 'a pile of offset sheets, means for -feeding means may have a bodily movement to and from the cylinder, a clear space being left after .such movement so that 'free access may be had .to the cylinder.
  • a printing machine In" a printing machine, the combination with an impression cylinder, of-meansfor supporting a pile of sheets, of means for successively feeding'the sheets to .the cylinder,-means for delive'ringlthe sheets from the cylinder to the top of the pile; and a switchfor switching'a sheet away from the .tion' with a printing couple and means for pile.
  • the combine tion with an impression cylinder of means for feeding the sheets successively from the: bottom of the pile to "the impression cylin operation thereof, and means for returning the sheets to the pile.
  • the c01nbina- In a printingmachine the conibina-v pression member of the coupleffrom the tion .of an impression member, means'fOr feeding a fresh pfi's'et sheet thereto from a pile at each-operation of. the member, and v means for returning the sheets to the *sam pilefrom which they were fed.

Description

I. TORNBERG OFFSET PREVENTING MECHANISM FOR PRINTING MACHINES,
7 .APPLICATION FILED SEPT.6, 1917- 1,374,253. PatentedApr- 12, 1921.
4 SHEET SSHEET I.
INVENTOR l. TORNBERG.
bFFSET PREVENTING MECHANISM FOR PRINTING MACHINES.
APPLICATION FILED SEPT. 6, 1917.
1,374,253. Y Patented Apr. 12,1921.
4 SHEETS-SHEET 2- I. TORNBERG. OFFSET PREVENTING MECHANISM FOR PRINTING-MACHINES.
APPLICATION FILED SEPT. 6I I9I7.
9 v A E .a VM 4 TI rNN l. TORNBERG. v OFFSET PREVENTINGIMECHANISM FOR PRINTING MACHINES.
APPLICATION FILED SEPT. 61 1917.
Patented Apr. 12, 1921.
4 SHEETSSHEET 4.
mvEm'oR A'rrws UNITED STATES" PATENT OFFICE.
rsrnon 'ronNBnne, or nw Y OItK, Y., 'ASSIGNOR r0 anon :AND 00., or New YORK, N. Y., n conrona'rron or NEW YORK.
OFFSET-PREVENTING MECHANISM non rnrN'rme-mncnrmis.
Specification of Letters Patent.
PatentedvApri 12, 1921.
Application filed September 6, 1917. Serial No. 189,935.
,useful Improvements in Offset-Preventing Mechanism for Printing-Machines, fully described and represented in the following specification and the accompanying drawings, forming a part of the same. This invention relates to certain improvements in offset preventing mechanism for printing machines.
To, prevent offset, that is, an impression from the freshly printed side of the web or sheet-and the second impression member, in
perfecting a web or sheell, therehave been commonly used a traveling ofi'set web which, after being used, is rewound to be used over again, or a shifting offset web or tympan which is automatically periodically shifted so as to present a fresh surface against the freshly. printed side of the web every so many revolutions of the impression cylinder, this shifting tympan being wound upas it shifts in a suitable recess provided within the cylinder Walls. Both of these ofi'set preventing means are open to objection, in that much time is lost in changing the position of theofl'set rolls, resulting in frequent stoppage of the machine, and, if any damage should be done to the central portion of the roll, such as a wrinkle or tear, the entire roll is ruined and has to be thrown away, thus causing a considerable cost.' It has been proposed, to overcome these disadvantages,
' to employ ofiset sheets which shall be presented to the freshly printed side of the web between it and the second impression member. In the prior. constructions, however, for effecting this, the offset sheet was presented to the freshly printed side of the web only after a number of revolutions of the impression cylinder, and, consequently, after a number of impressions. While this construction obviated some of the difficulties referred to, there still was apt to be asmut caused by the freshly printed side "of the web leaving offset on the oifsetsheet, which is offset or sm'utted' onto the succeeding portions of the web, owing to the fact that the sheet made a number of contact impressions with the printed side of the web before 1t was changed. This resulted in bad printmg and is objectionable for this reason, particularly where fine printing is desired.
It 1s one object of the present. invention toproduce a construction whereby 'ofl'set sheets may be fed from a pile or other suitable source of supply, so that a fresh sheet shall be presented between the printed web or sheet and the impression cylinder at each lIIlPIBSSlOIl, the offset sheet, after it has been printed aga nst, being returned to the pile and a fresh sheet substituted, a sufficient number of sheets being used in rotation and a 'suflicient number of sheets being provided, so that they will have time to sufficiently dry before they are again presented to the printed web or sheet. v It 1s a further object of the invention to provlde a feeding mechanism for feeding ofi'set sheets, which may be loaded while the work 1s going on, so that the feeding canbe contmuous and no time lost and no stoppage of the'machine for changing the feeding dev1ces 1s required. I
It 18 3. further object of the invention to produce an improved mechanism'for feeding oflset sheets which may be so mounted in relation to the impression cylinder or other feeding mechanism as a whole may be moved away from the impression cylinder so as "to allow ready access-thereto.
It is a further object of the ll'lVBIllZlOll'bO provlde such an offset preventing mechanism which may be employed with any type of perfecting printing machine, whether the machine prints from a web, or from sheets supplied thereto in any suitable manner, or from a web cut into sheets prior to printing.
With these and other objects not specifically referred to in view, the invention con sists in certain parts and combinations whichwill be specifically described in connection with the accompanying drawings,
in which? Figure 1 is a diagrammatic side elevation of a rotary web perfecting press embodying the invention;
2 is a detailside view showing the run of the offset sheets through the feeding "mechanism, the feeding mechanism being that shown-in ,Fig. 1;
Fig. 3 is a side elevation diagrammatically showing a'rotary printing machine in which the sheets are cut from the web before being rinted and perfected, nd embodying the invention; Y
, F igpt is a, detailfside elevation showing one form of switch mechanism which may D M mechanismsmay be employed for effect ng be employed to prevent a worn or dirty sheet from being returned to theimpression mechanism may vary wldely. in its specific cylinder;
Fig'. 5 is a sectional view, partly broken away,'showing an impression cylinder and construction.
the arrangement for holdirig the blanket] and the grippers for holding the offset sheet in position, where the machine is used for, printing on a continuous web, the grippers being shown in closed position; I
' Fig. '6 1s a View similar to Fig. 5, the grip;
pers being shown in open position;
"Fig. 7 is a side View, partly in secti'onfof the construction shown in Figs. 5 and 6, and,
Fig. 8 is a view showing'the impression cylinder and arrangement where the machine shownin Fig. 8 isemployed for printing] I and perfecting sheets cutfrom a web.
Referring now to the' drawings and first to Figs I, 2 and): to 7, inclusive, the invention is shown as'embodied in a rotary ma-.
chine in which a continuous web is printed and perfected and then led to other mechanisms in'whi'ch it is cut or folded. ,Thevaor suitable co nstruction. Suitably supported.
in the frames is a web roll W from which the w p grippers "l l'which are carried in blocks 15 web W. is led over the usual guiderolls 2 i .throughthe first printing couple which includes a form cylinder 3 and an impression cylinder l: The particular machine illustrated in Fig.1 is'a'rrangedto print in'one color onone side, of the web: and to perfect a web in two colors. After the web is rint-v ed in theprinting couple'3, 4:, it is per ecte'd by form cylinders 5, 6 which cobperate' with I a large impression cylinder 7,- the web, after it has been perfected, being led from the J-machine over the usual guide roll 8. Inking mechanisms 9 of any usual type are provided :In machines embodying the invention, there will be provided a mechanism for feed ing-offset sheetsibetween the freshly printed side of the, web and theimpressioncylinder of the second all perfecting printing couple, and in machines embodying the invention in its besii form these offset sheets will be'fed. cohtinupuslj and by mechanism which can be load dwhile the machine'is. worki'n'g,"so
that the operation of feeding the sheets will 'be continuous, thus obviating a y necessity for stopping the machine'to effect the'chajnge of the sheets.- Furthermore; these "oifset sheets will, be "of dimensions corresponding.
with the length of the impression made by the form cylinder and one of thesebfis'et sheets will be fed between the freshly printed web and the impression cylinder of the perfecting couple at'each operation of the pers.
impression cylinder, a sufficient number of thisffeeding of theofiset sheets and-such In theparticular machine illustrated, however, there is provided a 'feedingf'mechanism in which the sheets 'marked S (see Fig. 2) .are fed into the machine from a 'pile'whichmay be placed on a this feedin being efiected by means of the usual combing roll 11 which acts to comb or .fan'out the sheets as is usual in sheet feeders,
a presser foot 12 being "provided as. usual a common one and 'of itself forms no part of the invention.
over suitable feeding-in rolls 13 and are taken by suitable. sheet takingadevicescar ri'ed by the second impression cylinder. The sheet taking devices ma'ybeof any suitable character. In the particular construction illustrated, these sheet taking devices arev mountedjfo n a shaft 16 suitably positioned within the cylinder, this shaft being carriedv are fedfrom theifeedei" ifeed table 10 ,which is suitably located closely; adjacent the second impression cyl-. Jinder 7. The'sheets are fed from this table 'so that the undersheet ofthe pile is first de- A 7 livered or fed to the-impression cylinder,
onrock arms 17. which are operated in any nsual orqdesired' manner for eifecting' the opening" andclosing movement of the grip- The grippers l4, operate through a slot '14 formed in the cylindcrwall and in,
the bestconstructions these grippers will be [formed and will be operatedso that when in" their closed position they will be entirely 'below thefsurface of the .cylinder as shown in Fig.- 5, so as not to iriterferewith the web passing around the cylinderi These grippers coeperate with suitable abutments 15 to 'hold the sheet firmly in 'position on the cylindenblanket. Where. as in the-machine I illustrated, the second impression'cyli-nder is twice the diameter of the two 'form cylinders with;which itcotiperates, this cylinder will, as s'hoWn in'Fig, 1,-be provided -with we sets of oifset sheet takinggrippers which identical in construction and operation, "the two sets'of grippersbeing provided so that the freshv sheet may be fed for each im 'pressiong It may bestated that the i'mpression cylinder is as'usual provided with any impression blanket indicated at' l8 (Figs. 5- 'and -'.6),' the "ends of which extend into the.
cylinder and which may be adjusted by the usual blanket rolls 19 located withinthecy1 inder walls. a
After the oifset sheet has been passed "with. the web throu h the machine, it is delivered from the cy inder back onto the top of the pile on the feed table 10 over suitinvention in its best form means will beprovided for pushing. or lifting the end of the offset sheet from the cylinder to insure v the sheet passing to the guide before referred to, over which the sheet is delivered to the table. While these means may vary; in the particular construction illustrated there are provided a series of pushing pins 21 carried on slides 22 mounted on blocks 23 suitably secured within the cylinder, the slides 22 being operated by rock arms 25, 25 on a shaft 26,- one of the arms, as 25, taking into a slot in the lower end of the slides, and the other arm 25- being operated from a cam roll 27 secured thereto and operated from a cam 28 suitably secured to the frame of the machine, this cam being indicated in dotted lines in. Fig. 6. These pushers, as shown in Fig. 6, when elevated, act to lift up or strip the end of the sheet S from the cylinder and assure the sheet passingonto the guide 20.
In machines embodying the invention in its best form, devices will be provided whereby a worn or too badly soiled sheet may be prevented 'from again passing through the machine from the feeder, such worn or soiled sheet being removed as it is delivered to the top of the pile by the guide. Various devices may be employed for such purpose, but a convenient one is that illustrated in Fig. 4 inwhich there is shown a receptacle 30 mounted in any suitable manner adjacent the feeding mechanism. This receptacle has an open end and at the open 'end is provided a switch 31 pivotally mounted on a stud 32, the switch being operated by hand lever 33. When a worn or badly soiled sheet comes through, the operator simply throws this'switch into the position shown in Fig. .4, which causes such sheet to be delivered to the receptacle 30,
- instead of again passing around the combing roll '11 and into the machine.
For convenience 1n access to the second impression cylinder, in the best construefrom the second impression cylinder by means of a pinion 36 cooperating with racks 37, this pinion being operated by any suitable tool. v Y
The construction so far described provides for the feeding of the offset sheets at eachimpression to printing machines in which a continuous web is 'printed. In Figs. 3 .and 8 is shown a construction in which the .web is cut into sheets after be-- ing printed upon. Such construction, in addition to the mechanisms hereinbefore described, includes a pair of cutting cylinders 38, 39, sheet feeding mechanism 40, and ad ditional sheet taking devices which are shown as grippers 41, are provided, on the 'second impression cylinder for holding the cut sheets thereon. When the machine is, as shown in Flgs. 3 and 8, arranged to print and perfect sheets out prior to the printing,
the usual taking cylinder 42 and delivery cylinders 43, 44:: may be provided. .The
- mechanism for feeding the offset sheet to the second impression cylinder in this type of machine will, however, be similar to that heretofore described and consequently need not be described again.
While a simple and eflicient construction has been illustrated and described for effecting the objects of the invention and such construction has been shown as embodied in two types of perfecting printing machines, it will'be understood that various feeding mechanisms may be employed for continuously feeding offset sheets in rotation through the machine and that such feeding mechanism may be employed with other types of perfecting machines than those shown and described and that the invention is not to be limited to the precise type of perfecting machine or feeding mechanism shown.
What is claimed is V 1. In a printing machine, the combination with a printing eouple, of'a pile of offset sheets, and means for feeding offset sheets continuously thereto from the bottom of the pile, one such sheet being fed for each im-- pression operation of the impression member of the couple.
2: In a printing machine, the. combination with an impression cylinder, of means for feeding one of a plurality of superposed offset sheets thereto inrotation, onesuch sheet being fed for each impression operation of the cylinder.
3. In a printing machine, the combination with an impression cylinder, of means for continuously feeding oneof a plurality of superposed offset sheets thereto in rotation, one such sheet being fed for each impression operation of the cylinder.
4. In aprinting machine, the combination with an impression cylinder, of means for supporting a pile of ofi'set sheets, means for feeding the sheets successively to the impression cylinder, one sheet being fed for each impression'operation thereof, and means for returning-the sheets to the pile.
5. In a printing machine, thejcombination with an impression. cylinder, of 'means for tem of the pile to thecylindenand devicessupporting a pile of offset sheets, means for feeding thefsheets successively from the botfor -returning 'the sheet to the'top of the'pile.
"6. In a printing machine, the combination with an Impression cylinder, of means for 1 supportin 'a pile of offset sheets, means for -feeding means may have a bodily movement to and from the cylinder, a clear space being left after .such movement so that 'free access may be had .to the cylinder.
' 8. In a printing machine, the combination with an'im'pression cylinder, of a support for. a-pile of offset sheets, a feeding mechaand means for sliding the frame to and from r for feeding the sheetssuccessively to the cylinder, 9. frame in which the pile support and the feeding mechanism is mounted,
I the impression cylinder, 2, clear space-being maybe had to the-cylinder.
left after such movement so thatlfree access 9; In" a printing machine, the combination with an impression cylinder, of-meansfor supporting a pile of sheets, of means for successively feeding'the sheets to .the cylinder,-means for delive'ringlthe sheets from the cylinder to the top of the pile; and a switchfor switching'a sheet away from the .tion' with a printing couple and means for pile.
10. In a printing machine, the-combinafmy hand.
supporting a pile of offset sheets, of means for feeding the sheets successively to the. impressionmemberof the couple, one sheet being fed for. each impression operation thereof,-and means for returning the sheets to thepile.
11. In a printing machine, the combine tion with an impression cylinder, of means for feeding the sheets successively from the: bottom of the pile to "the impression cylin operation thereof, and means for returning the sheets to the pile.
for supporting a pile ofbfi'set sheets, means der, one sheet being fed for each impression 12. In a printing machinefthe .conltbina I tion with a printing couple; of means for supporting" a pile of ofi'setsheets, means for Y successively feeding the sheets to the mipression member of the couple, ineans forl.
, delivering the sheets to the pile,1 and; devices for preventing the return of a sheet to the pile. i i
13. tion with a printingcouple, of means forsupporting a pile of offsets-sheets, means for successively feeding the sheets to the imbottom of the pile, means fo'r returning the lsheets to the top of the pile, and devices for preventing-the return ofa sheet to the pile.
14. In a-printing machine,.the combina- ;tion of an impression imember, means for;
feeding offset sheets thereto from a pile and -means for returning the sheets to the same pile from which they were-fed.
' 15. In 'aprinting machine, the c01nbina- In a printingmachine, the conibina-v pression member of the coupleffrom the tion .of an impression member, means'fOr feeding a fresh pfi's'et sheet thereto from a pile at each-operation of. the member, and v means for returning the sheets to the *sam pilefrom which they were fed. v
In testimony whereof, I'ha ve hereunto'set IsIDoR ToRNBnne.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3029731A (en) * 1959-03-25 1962-04-17 Zeuthen & Aagaard As Mechanism for duplicators for inserting interleaving sheets between the printed sheets
US4501415A (en) * 1981-09-04 1985-02-26 Motter Printing Press Co. Balanced deflection gripper for sheet handling equipment
US5575204A (en) * 1994-11-25 1996-11-19 Riso Kagaku Corporation Device for mounting leading end of stencil in rotary stencil printer
US6382095B1 (en) 1999-11-11 2002-05-07 Riso Kagaku Corporation Stencil leading end mounting device having movable linear pivot of rotary stencil printer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3029731A (en) * 1959-03-25 1962-04-17 Zeuthen & Aagaard As Mechanism for duplicators for inserting interleaving sheets between the printed sheets
US4501415A (en) * 1981-09-04 1985-02-26 Motter Printing Press Co. Balanced deflection gripper for sheet handling equipment
US5575204A (en) * 1994-11-25 1996-11-19 Riso Kagaku Corporation Device for mounting leading end of stencil in rotary stencil printer
US6382095B1 (en) 1999-11-11 2002-05-07 Riso Kagaku Corporation Stencil leading end mounting device having movable linear pivot of rotary stencil printer

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