US1369909A

US1369909A - Plate-holder for printing-presses

Info

Publication number: US1369909A
Application number: US396978A
Authority: US
Inventors: Harry G Turner
Original assignee: Individual
Current assignee: Individual
Priority date: 1920-07-17
Filing date: 1920-07-17
Publication date: 1921-03-01
Anticipated expiration: 1938-03-01

Description

H. G. TURNER.

PLATE HOLDER FOR PRINTING PRESSES. APPLICATION HLED JULY 17, 1920.

LQQQ QQQ Patented Mar. 1, 1921.

fm m r HARRY G. TURNER, OF CHICAGO, ILLINDIS.

PLATE-HOLDER FOR PRINTING-PRESSES.

Specification of Letters Patent.

Patented Mar. 1, 1921.

Application filed July 17, 1920. Serial No. 396,978.

To all whom it may concern:

Be it known that I, HARRY Gr. TURNER, a citizen of the United States of America, and a resident of Chicago county of Cook, and State of Illinois, have invented certain new and useful Improvements in Plate-Holders for Printing-Presses, of which the following is a specification.

The purposes of this invention are to provide a practical plate holder for plate printing presses of the general type known as roller, embossing or die presses designed to make impressions from engraved plates. It is customary in plate presses to secure the plate to the bed of the press by soap or paste on an intervening piece of cardboard. Such manner of mounting the plate on the bed of the press sometimes results in slight creeping of the plate along the bed. Plate holders are often not practicable for this class of work, due to time required in adjustment and the fact that the parts thereof are apt to tear the wiper of the plate-wiping mechanism. Further, the plates are comparatively thin and should be raised from the plate holder or bed of the press in order that the inking and wiping devices engage the surface. The. plate holder should also provide a solid back at all points of the plate.

With these objects in View, the invention comprises a pair of rectangular blocks which are slidable with respect to each other to accommodate plates of diiferent lengths, and each block at one end carries a tooth-shaped member for entering notches which have been cut in the edges of the plate, preferably along the center line of the engraving. The two blocks when set as desired are secured against displacement by means of a clamp or chuck commonly employed in the pluming art.

The objects of the invention are accomplished by the device shown in the accompanying drawings, in which- Figure 1 is a perspective view of a plate holder and clamp constructed according to this invention.

Fig. 2 is a perspective view of one of the toothed plate-engaging elements.

Fig. 3 shows in perspective a plate notched as required for being engaged and centered by the plate holder." 1

The drawingsshow a chuck consisting of a frame structurel and a pair of clamping elements 2 and 3, "oneof which is adjustable toward the other by means of a nut thereon coacting with a threaded bolt, the head of which is indicated at 4:. This being an ordinary form of chuck, detailed illustration thereof is omitted.

The plate holder to which the invention relates consists of a pair of rectangular blocks 5 and 6 located between the clamplng elements 2 and 3 and adjustable with respect to each other transversely of the chuck. The chuck provides a solid bearing for the blocks 5 and 6 and the latter in turn provide a bearing at all points for the engraved plate 7. The plate before being placed upon the plate holder is notched, preferably along the center line of the engraving, as indicated at 8. These notches may be quickly out in the edges of the plate by a file, such as a triangular file or other which corresponds in form to the shape of teeth 9 on the plate-securing members 10 and 11. The member 10 is secured to block 5 and the member 11 is secured to the block 6 by means of screws 12. One of the members 10 or 11 is properly mounted on its block to afford resilient means for engaging the notch in the edge of the plate, and which may be tightened against the plate by means of a screw 13 having threaded engagement with an aperture in the end of the block upon which it is mounted.

The construction described affords a simple means for securing the plate against displacement provides a firm bearing for the plate and is suitable for properly clamping a very thin plate without any part of the clamping means projecting above the plate or interfering with the action of the wiper which is usually given a sweeping circular motion over, the plate.

In clamping a plate by means of this plate holder, the plate is first notched at its side edges. The plate is then placed upon the blocks 5 and 6 which are then slid toward each other along their contacting edges until the toothed elements 10 and 11 engage the notches in the edges of the plate. The blocks 5 and 6 are firmly held in this position while the clamping screw is turned to clamp the blocks between the clamping members 2 and 3. The plate is then further tightened between the toothed engaging means by an adjustment of screw 13.

Although but one specific embodiment of this invention has been herein shown and described, it will be understood that numerous details of the construction shown may be altered or omitted without departing from the spirit of this invention as defined by the following claims.

I claim:

1. A plate holder of the class described, comprising a pair of blocks slidable with respect to each other along coacting edges, clamping means for clamping the blocks togetherin set position, and a tooth carried by each block for engaging the edges of a plate resting on the block.

2 A plate holder of the class described, comprising a pair of blocks slidahle with respect to each other along coacting edges, clamping means for clamping the blocks together in set position, and a tooth on one of said blocks for engaging the edge of a plate resting on the blocks.

'3. In an device of the class described,

the combination with a printing plate having notches cut in its edges, 01 means for securing said plate against displacement in a printing press, comprising a clamp coacting with a pair of blocks slidably mounted on said clamp and each carrying a tooth for engaging the notches in said plate.

4. In a device of the class described, the combination with a printing plate having notches cut in its edges, of means for securing said plate against displacement in a printing press, comprising a clamp coacting with a pair of blocks slidahly mounted on said clamp and each carrying tooth for engaging the notches in said plate, and one of which teeth is adjnstably mounted on its block.

Signed at Chi 'ago this 15th day of July,

HARRY G. TURNER.