US2123997A - Sheet-holding means for cylinders of printing presses and the like - Google Patents

Sheet-holding means for cylinders of printing presses and the like Download PDF

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Publication number
US2123997A
US2123997A US19206A US1920635A US2123997A US 2123997 A US2123997 A US 2123997A US 19206 A US19206 A US 19206A US 1920635 A US1920635 A US 1920635A US 2123997 A US2123997 A US 2123997A
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Prior art keywords
jaw
sheet
holding
bar
cylinder
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Expired - Lifetime
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US19206A
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Joseph F Jirousek
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Chandler and Price Co
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Chandler and Price Co
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Priority to US19206A priority Critical patent/US2123997A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F27/00Devices for attaching printing elements or formes to supports
    • B41F27/12Devices for attaching printing elements or formes to supports for attaching flexible printing formes
    • B41F27/1218Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices
    • B41F27/1225Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices moving in the printing plate end substantially rectilinearly
    • B41F27/1243Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices moving in the printing plate end substantially rectilinearly by pivotal or swivelling motion, e.g. by means of a rocking lever

Description

July 19, 1938. J. F. .mousEK SHEEi HOLDING MEANS FOR CYLINDERS OF PRINTING PRESSES AND THE LIKE Filed May 1, 1935' l Q b f a 5 43/ ATTORNEY INVENT OR.

Patented July 19, 1938 UNITED; STATES PATENT, orrlcr.

SHEET-ROWING lVIEAN S FOR CYLINDERS OF PRINTING PRESSES AND THE LIKE Joseph F. Jirousek, Cleveland, Ohio, assignor to The Chandler & Price Company, Cleveland,

Ohio, a corporation of Ohio Application May 1, 1935, Serial No. 19,206

- 7 Claims. (01. 101-4151) accuracy of alignment after the sheet is clamped.

A still further object is the provision of quickacting release for removal of the clamped sheet. Other objects and advantages will appear as the description proceeds.

To the accomplishment of the foregoing and related ends, the invention, then, comprises the features hereinafter fullydescribed, and articu larly pointed out inpthe claims, the following description and the annexed drawing setting forth in detail certain illustrative embodiments of the invention, these being indicative however, of but a few of the various ways in which the principle of the invention may be employed.

In said annexeddrawing:

Fig. 1 is a plan view of a cylinder embodying the invention; Fig. 2 is a transverse section thereof, on enlarged scale, takenon a plane substantially indicated by line 11-11, Fig. 1; Fig. 3 is a fragmentary similar view showing the parts in releasing position; Figs. 4 and 5 are side elevational and front elevational views respectively of a detail of the clamping mechanism; and Figs. 6 and '1 are detail sectional views taken substantially on lines VIVI and VII'-VII, respectively, Fig'. 1.

The cylinder body C may be of any usual or preferred construction, and may involve for instance a shell 2 having a ledge 3 upon which are carried means for holding one end of a. sheet P, such for instance as a zinc lithographic plate, such means comprising a fixed jaw Q, and a cooperating adjustable jaw 5, the latter being tightened into holding position againstgthe end of the sheet 6 by tightening means, such as screws 7. Desirably, the

latter have recessed heads or an internal wrenchhold 8, thereby offering little obstruction externally. With the sheet fastened by the series of end-holding jaws 5, the body of the sheet is drawn around the cylinder to engage in theduced portions to serve as journalaland these ride respectively in a fork H in the form of a slide having a small excursion of movement on' the plane of the base of the jaw. .The slide it has'a stem extension l5 which rides through a slide mounting opening'in'the baseljaw, and a compression spring l6 surrounding" the stem and located between the slide and the jaw'abutments serves to normally urge the slide into its for- ,ward position. Rearwardly, of the jaw member ID is a latch l'l pivoted to the jaw member at It, and having an opening through which the stem l5 extends, the opening being such-that the stem passes freely through the latch but when desired the stem may be pulled back by the latch to release the jaw member l2, by reasonof the latch coming against an abutment-pin IS on the stem for such release movement; The inclined plane upon which the roller, l2 moves is conveniently provided by end members if! secured to the base jaw It by suitable screws s. With such arrangement, .the jaw-roller l2 with its slide it may have a range of movement within the space between the jaw member iii and the jaw member II, and as the roller moves for:- wardly it travels up the inclined plane surfaces l3, I3 and thereby binds more tightly against the plate to grip the same against the jaw ll.

The latter may be knurled or roughened on its set on a rock-shaft 20, and by provision of a spring 2! between the shell 2, in a suitable abut ment recess 22 for instance while the other end of the spring seats against an abutment plate 23 carried by the shank of the jaw Ill, a uniform rearward thrust on the jaws i0 is had, thus tending to maintain suitable tension and tightening action upon the sheet being held. A screw head 24 may convenient-1y serve as centering and re taining means for the spring with respect to the abutment plate 23. The jaw body l0, 1 I, may be swung forward on shaft 20 against the action of the spring if a hand tool be inserted in a convenient hole 9 for this purpose, thus aifording a handle and leverage. I

By providing the jaw member 4 in the form of a bar in common for the entire set of endclamps, a nicety of adjustment after the sheet is gripped, may be had. It sometimes occurs that even when properly initially gauged, a sheet or lithographic plate is ultimately found to be .bar, abutting'against a suitable surface on the cylinder thus serves to advance or retard one end of the bar as compared with the other, as may be necessary in any given instance to skew the sheet or plate sumciently to effect the desired alignment. The jaws l, 5, are provided with gauge pins 21, these being fixed in the jaw-bar and projecting into openings 28 in the jaw 5. By provision of a lip-lug 29 on the jaw 5, engagement of the latter relative to the jaw l is assured in uniform manner, so'that the gauge pins 21 will always properly enter the openings 28 in the cooperating jaw and notinterfere. is normally urged into open position by a spring 30 between the jaws, centered about a retaining pin 3i and seating at each end in appropriate recesses in the jaw surfaces.

The manner of use of the device will be under stood from the foregoing. A sheet to be held in position, for instance a zinc lithographic plate is brought into position with one end in the jaws I, 5, these being initially in open position, the screws 1 being released for that purpose so that the springs 3D maintain them open. With the end of the plate pushed into position against the row of gauge pins 21., the movable jaws are set down into clamping position by wrench-tightening .each of the screws 1, and thereby this end of the plate is gripped. The plate is then wrapped around the cylinder and, as the operator swings the jaws ll forwardly by a hand wrench or tool inserted into one of the holes 9, the farther end of the plate is thrust into the jaws II, and rides over the jaw-rollers l2, these being displaced backwardly on the give of the springs l3, sufficiently to allow such admission, but immediately on cessation of the thrusting movement of the plate, the jaw-rollers I! hold the plate. When it is desired to remove the sheet P, the latches I! are drawn back from the jaws ll thereby pulling the stems l5 and jaw rollers l2. into release and the sheet may be drawn out of the jaws. Undue movement of the jaw units III is guarded against in any positioning by suitable stops. Thus, a stop-projection 33 carried by the jaw at the rear, by engaging against the shoulder 34 on the cylinder prevents the jaw being swung too far back. A stop projection 35 at the front of the jaw serves to abut against the cylinder and prevent the jaw itself from contacting closely.-

Other modes of applying the principle of the invention may be employed, change being'made as regards the details described, provided thefeatures set forthin any of the following claims, or ,the equivalent of such, be employed.

. I therefore particularly point out and distinctly claim as my invention:

1. In mechanism of the character described, a cylinder and means for holding sheet material about its periphery, including a plurality of jawcouples for holding one end of the sheet to the cylinder, said couples having each an interposed spring and a gauge pin, a bar in common-mounting said jaw-couples, a central pivot for said bar, a regulating screw at each end of said bar, and self-tightening clamp means for the other end of the sheet, said means having a roller-jaw element and a jaw element for receiving the same,

The. jaw 5.

and an inclined surface upon which said roller element may travel.

2. In mechanism of the character described, a cylinder and means for holding sheet material about its periphery, including a plurality of jawcoupies for holding one end of the sheet to the cylinder, said couples having each an interposed spring and a gauge pin, a bar in common mounting said jaw-couples, a central pivot for said bar,

a regulating screw at each endof said bar, and self-tightening clamp means for the other end of the sheet, said means having a roller-jaw element and a jaw element for receiving the same, an inclined surface upon which said roller element may travel, a slide for mounting said roller-jaw element, a stem extending rearwardly from said slide through said other jaw element, and a spring interposed between said slide and said other jaw element.

3. In mechanism of the character described, a cylinder and means for holding sheet'material about its periphery, including a plurality of jaw- .couplesfor holding one 'end of the sheet to the cylinder, said couples having each an interposed spring and a gauge pin,'a bar in common mounting said jaw-couples, a central pivot for said bar, a regulating screw at each end of said bar, and self-tightening clamp means for the other end of the sheet, said means having a roller-jaw element and ajaw element for receiving the same, an inclined surface uponwhich said roller element may travel, a slide for mounting said roller-jaw element, a ,stem extending rearwardly from said slide through said other jaw element, a spring interposed between said slide and said other jaw element, and a releasing latch for engaging said stem.

4. In mechanism of the character described, a cylindur and means for: holding sheet material about its periphery, including a plurality oi jawcouples for holding. one end of the sheet, each couple having an interposed spring and a gauge pin,- a bar for mounting said couples in common, a pivot centrally of said bar, an adjustablescrew at each end of said bar, and self-tightening clamp means for the other end-of the sheet. said means having a plurality of roller-jaw elements, cooperating jaw elements receiving the same,

a rock-shaft upon which said cooperating jaw elements are carried, a spring normally swinging said cooperating jaw elements rearwardly, and an inclined plane surface upon which each roller-jaw element may travel.

5. In mechanism of the character described, a i

cylinder and means for holding sheet material about its periphery, including a plurality of jawcouples for holding one end of the sheet, each couple having an interposed spring and a gauge pin, a bar for mounting said couples in common, a pivot centrally of said bar, an adjustable screw at each end of said bar, and self-tightening clamp means for the other end of the sheet, said means having a plurality of roller-jaw elements, cooperating jaw elements receiving the same, a

rock-shaft upon which said cooperating jaw elemeans extending through said jaw member for mounting the same pivotally to swing in the plane of the end of the sheet to be gripped, a plurality of jaw elements mounted on said jaw member and cooperating with the latter to grip the sheet material, and adjusting screw means for regulating the amount of swing-position of said jaw member relative to the cylinder.

'7. In mechanism of the character described, a.

0 cylinder and means for holding sheet material about its periphery including a jaw member en-

US19206A 1935-05-01 1935-05-01 Sheet-holding means for cylinders of printing presses and the like Expired - Lifetime US2123997A (en)

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Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2578406A (en) * 1948-05-15 1951-12-11 Time Inc Blanket clamp for blanket cylinders of printing presses
US2586146A (en) * 1949-03-31 1952-02-19 Ditto Inc Duplicating machine plate clamp
US2694976A (en) * 1950-05-29 1954-11-23 Huck Co Plate lock-up mechanism for printing machines
US2716153A (en) * 1950-05-26 1955-08-23 Knut J Magnusson Facsimile scanner
US2730949A (en) * 1954-07-30 1956-01-17 Addressograph Multigraph Clamp for master sheets of printing machine
US2730948A (en) * 1952-01-22 1956-01-17 Addressograph Multigraph Clamp for master sheets of printing machines
US2732798A (en) * 1956-01-31 chase
DE953702C (en) * 1951-04-26 1956-12-06 Ditto Inc Tensioning device for the flexible printing plates of rotary printing machines
US2775198A (en) * 1953-08-27 1956-12-25 Harris Seybold Co Plate clamp
US2810573A (en) * 1953-08-24 1957-10-22 Nadel Bernard Metal stock feeder mechanism
US2818806A (en) * 1953-02-11 1958-01-07 Hoe & Co R Printing plate cylinder
US2915357A (en) * 1955-01-24 1959-12-01 Ampex Magnetic tape apparatus
US2961951A (en) * 1958-04-24 1960-11-29 Koppers Co Inc Holding device
US2973710A (en) * 1958-03-14 1961-03-07 Hantscho George Printing press rollers
US3424085A (en) * 1965-03-20 1969-01-28 Heidelberger Druckmasch Ag Structure for clamping printing plates to a printing cylinder of a rotary printing press
US3460443A (en) * 1965-09-20 1969-08-12 Harris Intertype Corp Apparatus for operating on sheet material
US3835778A (en) * 1973-09-14 1974-09-17 Register Syst Gmbh Device for attaching and adjusting flexible printing plates on printing cylinders
US3878784A (en) * 1971-07-12 1975-04-22 Printing Equipment Ab Method of fastening a printing plate on a cylinder in a printing press and device for said fastening
US3896728A (en) * 1973-03-22 1975-07-29 Asahi Chemical Ind Printing sheet gripping device for use with printing saddle
US4036133A (en) * 1975-12-12 1977-07-19 K & F Manufacturing Company, Inc. Printing plate clamping assembly
US4377974A (en) * 1980-11-28 1983-03-29 David M Company Printing blanket holding bar
US4459913A (en) * 1982-08-17 1984-07-17 A. B. Dick Company Adjustment structure for master holder
US4759287A (en) * 1981-06-13 1988-07-26 Komori Printing Machinery Co., Ltd. Unit-to-unit register adjusting apparatus for use in a sheet-fed rotary printing press
US5516096A (en) * 1994-05-10 1996-05-14 Polaroid Corporation Method and apparatus for securing a flexible sheet to a rotatable supporting surface

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2732798A (en) * 1956-01-31 chase
US2578406A (en) * 1948-05-15 1951-12-11 Time Inc Blanket clamp for blanket cylinders of printing presses
US2586146A (en) * 1949-03-31 1952-02-19 Ditto Inc Duplicating machine plate clamp
US2716153A (en) * 1950-05-26 1955-08-23 Knut J Magnusson Facsimile scanner
US2694976A (en) * 1950-05-29 1954-11-23 Huck Co Plate lock-up mechanism for printing machines
DE953702C (en) * 1951-04-26 1956-12-06 Ditto Inc Tensioning device for the flexible printing plates of rotary printing machines
US2730948A (en) * 1952-01-22 1956-01-17 Addressograph Multigraph Clamp for master sheets of printing machines
US2818806A (en) * 1953-02-11 1958-01-07 Hoe & Co R Printing plate cylinder
US2810573A (en) * 1953-08-24 1957-10-22 Nadel Bernard Metal stock feeder mechanism
US2775198A (en) * 1953-08-27 1956-12-25 Harris Seybold Co Plate clamp
US2730949A (en) * 1954-07-30 1956-01-17 Addressograph Multigraph Clamp for master sheets of printing machine
US2915357A (en) * 1955-01-24 1959-12-01 Ampex Magnetic tape apparatus
US2973710A (en) * 1958-03-14 1961-03-07 Hantscho George Printing press rollers
US2961951A (en) * 1958-04-24 1960-11-29 Koppers Co Inc Holding device
US3424085A (en) * 1965-03-20 1969-01-28 Heidelberger Druckmasch Ag Structure for clamping printing plates to a printing cylinder of a rotary printing press
US3460443A (en) * 1965-09-20 1969-08-12 Harris Intertype Corp Apparatus for operating on sheet material
US3878784A (en) * 1971-07-12 1975-04-22 Printing Equipment Ab Method of fastening a printing plate on a cylinder in a printing press and device for said fastening
US3896728A (en) * 1973-03-22 1975-07-29 Asahi Chemical Ind Printing sheet gripping device for use with printing saddle
US3835778A (en) * 1973-09-14 1974-09-17 Register Syst Gmbh Device for attaching and adjusting flexible printing plates on printing cylinders
US4036133A (en) * 1975-12-12 1977-07-19 K & F Manufacturing Company, Inc. Printing plate clamping assembly
US4377974A (en) * 1980-11-28 1983-03-29 David M Company Printing blanket holding bar
US4759287A (en) * 1981-06-13 1988-07-26 Komori Printing Machinery Co., Ltd. Unit-to-unit register adjusting apparatus for use in a sheet-fed rotary printing press
US4459913A (en) * 1982-08-17 1984-07-17 A. B. Dick Company Adjustment structure for master holder
US5516096A (en) * 1994-05-10 1996-05-14 Polaroid Corporation Method and apparatus for securing a flexible sheet to a rotatable supporting surface

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