|Publication number||USRE35647 E|
|Application number||US 08/597,865|
|Publication date||Nov 4, 1997|
|Filing date||Feb 7, 1996|
|Priority date||Apr 2, 1992|
|Also published as||DE4210897C1, EP0563699A1, EP0563699B1, US5284092|
|Publication number||08597865, 597865, US RE35647 E, US RE35647E, US-E-RE35647, USRE35647 E, USRE35647E|
|Original Assignee||Man Roland Druckmaschinen Ag|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (45), Referenced by (2), Classifications (7), Legal Events (1)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention relates generally to plate cylinders for printing presses, and more particularly, to plate cylinders having an adjustable slide rail for tensioning a printing plate about the cylinder.
Plate cylinders are known which have at least one adjustable slide rail disposed in a hollow or recess of the plate cylinder for tensioning a plate mounted on the cylinder. German patent 3,843,395 discloses a so-called flat pass guide for the adjustment of the slide rail in which a flat bottomed surface of a slide rail can be moved on the flat top of a guide. Such known flat pass guides cannot be controlled well, particularly when subjected to forces. For example, a tilting of the slide rail can occur when large forces act upon it. Such slide rails also often cannot be adjusted in all directions in the plane of adjustment, which runs parallel to the tangential plane of the plate cylinder, but instead are adjustable only in a circumferential direction. In other known devices of such type, adjustment in the circumferential direction makes further adjustment in an axial direction necessary, since the adjustments in the two mutually perpendicular directions cannot be completed independently of each other.
It is an object of the present invention to provide a printing plate cylinder having an improved plate tensioning and adjusting slide rail which is selectively adjustable in all directions in the adjusting plane.
Another object is to provide a plate cylinder slide rail as characterized above which is stably and exactly mountable and can be easily and accurately moved in the adjusting plane to the desired degree.
A further object is to provide a printing plate slide rail of the above kind which is relatively simple in construction and economical in manufacture.
Other objects and advantages of the invention will become apparent upon reading the following detailed description and upon reference to the drawings, in which:
FIG. 1 is a partially diagrammatic axial section of a plate cylinder having an adjustable slide rail in accordance with the present invention;
FIG. 2 is a longitudinal section taken in the plane of line II--II in FIG. 1, showing different positions of a roller ring module unit for the slide rail mounting;
FIG. 3 is a top view of the slide rail shown in FIG. 1; and
FIG. 4 is a fragmentary section taken in the plane of line IV--IV in FIG. 4, showing a motor operated slide rail adjusting means.
While the invention is susceptible of various modifications and alternative constructions, a certain illustrated embodiment thereof has been shown in the drawings and will be described below in detail. It should be understood, however, that there is no intention to limit the invention to the specific form disclosed, but on the contrary, the intention is to cover all modifications, alternative constructions and equivalents falling within the spirit and scope of the invention.
Referring now more particularly to the drawings, there is shown a printing machine plate cylinder 1 having a printing plate 4 mounted thereon. The plate cylinder 1 is formed with a cylindrical hollow or recess 2, within which a slide rail 3 is mounted. The printing plate 4 has one end fastened to the slide rail 3 which is adjustable for tensioning and positioning the plate 4 on the cylinder 1, the pressing starting point of which is indicated as position 5 in FIG. 1. It will be understood by one skilled in the art that the other end of the printing plate may be fastened to a similar slide rail, or alternatively, it may be held in any suitable conventional manner, for example by spring loaded pins which are inserted into holes cut into the end of the printing plate.
In accordance with the invention, for enabling easy and exact adjustable movement of the slide rail, the slide rail is supported by at least two roll bodies of an axial bearing disposed in the adjusting plane of the slide rail. More particularly, the slide rail is supported by a plurality of roll bodies arranged in respective circular cages to form modular units which permit free movement of the slide rail in all directions in the adjusting plane. To this end, in the illustrated embodiment, the slide rail 3 is supported for movement by a plurality of axially spaced roller ring module units 9 each comprising a plurality of roll bodies 10, which may be rollers or balls, arranged in a circular arrangement in a circular cage 10a.
In order to support the roller ring modules 9 such that they can follow adjustable movement of the slide rail 3 within the printing cylinder hollow 2, each module unit 9 has a respective fastening plate 6 secured to the plate cylinder 1 by screws 14. For enhancing the stability of the slide rail 3 mounting, roller rings modules 9 are disposed on opposite sides of the fastening plate 6 and are retained between upper and lower cover disks, 7, 8, respectively. For retaining the cover disks 7, 8, and the roller ring modules 9 in assembled relation, a fastening screw 11 is positionable through respective holes 12 in the cover disks 7, 8 and a hole 13 in the fastening plate 6. The screw 11 threadedly engages a tapped hole 15 in the underside of the slide rail 3. The upper cover disk 7 in this case is supported within a recess in the underside of the slide rail 3, and the slide rail 3, upper cover disc 7, lower cover disc 8, and the roller ring modules 9 interposed between the cover discs 7 and 8 and the fastening plate 6 all are maintained in assembled relation by the fastening screw 11.
For permitting free movement of the slide rail 3, cover discs 7 and 8, and roller ring modules 9 relative to the fastening plate 6, the fastening plate hole 13 is elongated in a direction transverse to the longitudinal axis of the slide rail and also is larger than the shank of the fastening screw 11 in the longitudinal direction of the slide rail. By such arrangement, it can be seen that pairs of longitudinally spaced roller ring module units 9 can be retained within the hollow 2 of the plate cylinder 1 by a respective fastening plate 6, while permitting free movement of the slide rail 3 in all directions of the adjusting plane. It will be understood by one skilled in the art that the roller ring module units 9 can be assembled in mounted relation on the slide rail 3 prior to securing the fastening plates 6 to the plate cylinder 1, thereby simplifying assembly and service.
With the slide rail 3 mounted in the hollow 2 of the plate cylinder in such manner, when forces are applied to the slide rail, it is freely movable in all possible directions in the adjusting plane II--II, as indicated in FIG. 1 within limits of the hole 13 in the fastening plate 6. As depicted in FIG. 2, the shank of the screw 12 is positionable between the dotted line positions 11a and 11b as depicted by the positioning arrow 16, and the roller ring modules 9 are positionable in one direction between the dotted lines 9a and in transverse direction between the dotted lines 9b. It will be appreciated that adjustment in the direction of the arrow 16, as shown in FIGS. 2 and 3 will affect stretching or loosening of the printing plate about the plate cylinder and movement of the slide rail in the direction of the arrow 17 will affect axial shifting of the slide rail and the printing plate for side registration.
In keeping with the invention, to selectively and exactly adjust the slide rail, respective eccentric adjusting means are provided for moving the slide rail in circumferential and axial directions with respect to the plate cylinder. For this purpose, the underside of the slide rail 3 is formed with a center slot 19 oriented in a circumferential direction, and longitudinal slots 19 parallel to the axis of the cylinder are formed in the underside of the slide rail 3 adjacent its opposite ends. Cross heads 22 are provided in each of the slots 19, 22, the cross heads being formed with planes as smooth as possible for movement in the slots free from play. As depicted in FIG. 4, the cross heads 22 each having center borings 13 in which pins 24 of eccentrics 25 engage. The pins 24 are arranged eccentrically to a cylindrical part 26 of the eccentric 25. The eccentricity illustrated in FIG. 4 by the positioning arrow 27, results from the distance from the center b of a gear 29 to the axis a of the pin 24. By turning the eccentrics 25, therefore, the respective cross heads 22 can be shifted in slots 19, 20. As a result, the slide rail can be moved in its adjusting plane II--II in each of the circumferential and axial directions depicted by the arrows 16, 17, respectively, and in all directions in between by virtue of a combination of such eccentric actuated movements.
For rotating each eccentric, a drive motor 28 with a gear 29 may be provided. Motor operated adjustment may be effected by virtue of a suitable control so that a machine operator can establish the actual positions of the eccentrics at any time and with it also the actual positions of the slide rail 3. Alternatively, positioning is possible by manual adjustment of the eccentrics. As depicted in FIG. 3, the distance 30 is the distance between the pressing starting point 5 and a starting or neutral position 31 of the slide rail. Starting from this target position, it will be understood by one skilled in the art that the positions of the slide rail can be calculated and adjusted.
From the foregoing, it can be seen that the slide rail mounting of the present invention enables the slide rail to be exactly and stably moved in all directions in the adjusting plane. The slide rail and its mounting also is relatively simple in construction and economical in manufacture.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US2737887 *||Apr 24, 1952||Mar 13, 1956||Erich Gericke||Shiftable flexible sheet securing device|
|US2998768 *||Dec 22, 1958||Sep 5, 1961||Carl Allers Ets||Mechanism for clamping flexible printing plates|
|US3017830 *||Sep 23, 1960||Jan 23, 1962||Harris Intertype Corp||Plate clamp for printing press|
|US3025790 *||Apr 30, 1956||Mar 20, 1962||Ejner Larsen Carl||Planographic printing method and apparatus|
|US3151554 *||Sep 21, 1961||Oct 6, 1964||Fairchild Camera Instr Co||Perforated sheet supporting arrangement|
|US3188952 *||May 8, 1962||Jun 15, 1965||Addressograph Multigraph||Holding and adjusting means for printing members|
|US3417696 *||Dec 13, 1965||Dec 24, 1968||Roland Offsetmaschf||Grippers with adjustable gripper pads|
|US3858512 *||Mar 22, 1973||Jan 7, 1975||Roland Offsetmaschf||Lock-up mechanism for flexible printing plates providing improved reference adjustment|
|US3884147 *||May 21, 1973||May 20, 1975||Roland Offsetmaschf||Device for fastening flexible printing plates|
|US3899972 *||Aug 27, 1973||Aug 19, 1975||Albright William H||Registration-adjusting printing plate saddle|
|US3903796 *||Feb 13, 1974||Sep 9, 1975||Heidelberger Druckmasch Ag||Means for clamping on flexible printing plates|
|US4006686 *||Sep 18, 1975||Feb 8, 1977||Ackerman Stephen P||Blanket fastening means for a cylinder blanket|
|US4092923 *||Mar 1, 1977||Jun 6, 1978||Dayco Corporation||Printing blanket holding apparatus|
|US4596188 *||Jul 2, 1984||Jun 24, 1986||De La Rue Giori S.A.||Method of fixing and adjusting a printing plate on a plate cylinder and device for carrying out the method|
|US4688483 *||Mar 15, 1985||Aug 25, 1987||Heidelberger Druckmaschinen Ag||Clamping device for a printing plate of an offset printing machine|
|US4712476 *||Feb 27, 1987||Dec 15, 1987||Heidelberger Druckmaschinen Ag||Device for securing flexible printing plates under tension on a plate cylinder of a rotary printing machine|
|US4831931 *||Aug 18, 1988||May 23, 1989||Heidelberger Druckmaschinen Aktiengesellschaft||Device for tensioning a flexible printing plate on a plate cylinder of a rotary printing machine|
|US4864930 *||Sep 16, 1987||Sep 12, 1989||Graphics Microsystems, Inc.||Ink control system|
|US4938135 *||Sep 13, 1988||Jul 3, 1990||Koenig & Bauer Aktiengesellschaft||Plate clamping assembly|
|US5088408 *||Feb 28, 1991||Feb 18, 1992||Matthews International Inc.||Printing plate mounting system and a printing plate composite utilizing such system|
|US5088409 *||May 21, 1990||Feb 18, 1992||Heidelberger Druckmaschinen Ag||Device for adjusting a flexible printing plate on a plate cylinder of a rotary printing press|
|US5088410 *||May 17, 1991||Feb 18, 1992||Komori Corporation||Plate lockup apparatus for printing press|
|US5097763 *||Nov 2, 1990||Mar 24, 1992||Man Miller Druckmaschinen Gmbh||Plate cylinder arrangement for a printing press|
|US5167186 *||Dec 27, 1991||Dec 1, 1992||Ryobi Limited||Offset printing machine, printing plate and image position reading-out method for offset printing machine|
|US5168810 *||Jul 24, 1990||Dec 8, 1992||Akiyama Printing Machine Manufacturing Company Ltd.||Plate adjusting mechanism for leaf-type printing machine|
|US5189958 *||Apr 5, 1991||Mar 2, 1993||A. B. Dick Company||Plate clamping system for a duplicating machine|
|US5199352 *||May 26, 1992||Apr 6, 1993||Komori Corporation||Plate lock-up device for printing press|
|US5284092 *||Mar 26, 1993||Feb 8, 1994||Man Roland Druckmaschinen Ag||Plate cylinder holder with slide rail circular bearing assembly|
|US5317968 *||Mar 17, 1993||Jun 7, 1994||Shinohara Machiner Co., Ltd.||Plate cocking apparatus for sheet-fed printing press|
|US5317972 *||Sep 18, 1992||Jun 7, 1994||Ryobi Limited||Offset printing machine, printing plate and image position reading-out method for offset printing machine|
|US5361697 *||Mar 2, 1992||Nov 8, 1994||Heidelberger Druckmaschinen Ag||Plate cylinder of a rotary printing press|
|US5361698 *||Feb 22, 1993||Nov 8, 1994||Man Roland Druckmaschinen Ag||Device for clamping a printing plate onto a plate cylinder|
|DE232730C *||Title not available|
|DE426022C *||Mar 1, 1925||Mar 4, 1926||Bruno Adler||Vorrichtung zum Einbrennen von Firmen- und sonstigen Angaben in Holz und anderes Material|
|DE2501511A1 *||Jan 16, 1975||Jul 22, 1976||Maschf Augsburg Nuernberg Ag||Vorrichtung zum befestigen einer biegsamen druckplatte auf dem plattenzylinder einer rotationsdruckmaschine|
|DE3933678A1 *||Oct 9, 1989||Apr 18, 1991||Miller Johannisberg Druckmasch||Vorrichtung zum positionsgenauen spannen einer druckplatte auf einem druckzylinder|
|DE3936446A1 *||Nov 2, 1989||May 8, 1991||Miller Johannisberg Druckmasch||Plattenzylinder einer druckmaschine|
|DE7216860U *||Koenig & Bauer Ag||Title not available|
|EP0269816A2 *||Oct 15, 1987||Jun 8, 1988||TUBETTIFICIO EUROPEO S.p.A.||Cylindrical plate-holder sleeve for removable-sleeve lithographic printing presses, in particular for printing on cylindrical bodies, and the like|
|JPH01108046A *||Title not available|
|JPH03190736A *||Title not available|
|JPS6072731A *||Title not available|
|JPS6256146A *||Title not available|
|JPS6353034A *||Title not available|
|NL57261A *||Title not available|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US6748862 *||Aug 27, 2001||Jun 15, 2004||Heidelberger Druckmaschinen Ag||Device for adjusting at least one register element in a printing machine, and corresponding method|
|US9120301||Nov 17, 2010||Sep 1, 2015||Bunting Magnetics Co.||Magnetic roll|
|U.S. Classification||101/378, 101/409, 101/415.1|
|International Classification||B41F13/16, B41F27/12|