US588895A - Gripper for job-printing presses - Google Patents

Description

(No Model.)

B. CAMPBELL. GRIPPER FOR JOB PRINTING PRESSES.

Patented Aug. 24,1897.

ing-press.

UNITED STATES v PATENT OFFICE.

EZRA CAMPBELL, OF DAYTON, lVASI-IINGTON.

GRIPPER FOR JOB-PRINTING PRESSES.

SPECIFICATION forming part of Letters Patent No. 588,895, dated August 2 4, 1897. Application filed May 25, 1896. Serial No. 592,976. (No model.)

To all whom it mar concern:

Be it known that I, EZRA CAMPBELL, a citi zen of the United States, residing at Dayton, in the county of Columbia and State of Wash ington, have invented certain new and useful Improvements in Job-Printing Presses; and I do hereby declare the following to be a full,

clear, and exact description of the invention,

such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to grippers used in job-printing presses for holding the paper in position while being printed.

My object is to provide improved and simple mechanism for easily and quickly ad justing the spring gripping-fingers, so that provision can be made for accommodating different widths of paper. 7

Having this object in view, the invention consists of certain novel features and combinations, as will appear more fully hereinafter.

In the accompanying drawings, Figure l is a side elevation of my complete invention; Fig. 2, a longitudinal section taken on line a: of the precedingfigure; and Fig. 3, a detail view of the springbracket and shaft pass-' ing through the same, full lines representing the bracket in engagement with the shaft and dotted lines out of engagement therewith.

A represents the frame, to which the sprin ggri'ppers are connected. This frame is provided with ears'l for connection to the print- The frame is also provided with two alined guide- slots 2 and 3, which are'separated by a cross-piece 4:. Additional narrow guide- slots 5 and 6 communicate with the aforesaid slots.

The spring gripping-fingers 7 and 8 are connected at their lower ends to the necks 9 and 10 of respective intern ally-screw-threaded nuts 11 and 12. The necks travel in the slots 5 and 6 and the nuts in the slots 2 and 3, so that the grippingfingers slide against the face of the frame, as shown.

I employ two long screws 13 and 14, provided with right and left hand screw-threads,

respectively-' The screw it passes through the nut 11, being in engagement with the screwthreads thereof. This screw is journaled in the frame at 15 and 10, respectively, the journal 16 being cut away at 17 to provide aclutch member. The screw 13 is provided with j ournals 18 and 19, the former of which is provided with a clutch member 20, adapted for engagement with clutch member-1'7, and is movable in the journalbearings in the frame. The other end of the screw is extended into an enlarged spindle 21, which is provided with two peripheral'notches 22 and 23 and carries a hand-wheel 24: on its extremity.

A spring-bracket 25, fastened to the frame by a screw 26, is adapted for engagement with the notches 22 and 23 to hold the spindle and screw in locked position. I also provide a suitable dust-cap 27, a screw 28 for fastening it to the frame, and oil-holes 29.

The operation is as follows: Should it be desired to shift the spring-finger 8, the springbracket will be in engagement with notch 22, and-if the hand-wheel is turned the screw 13 is rotated. The direction of rotation of the screw will determine whether this spring-finger is advanced or retreated. If, however, it is necessary that both fingers be adjusted simultaneously, the springbracket is depressed and the spindle and screw slid inwardly. The bracket will then spring into notch 23 and the clutch members be thrown into engagement. If the hand-wheel be rotated in one direction, the spring-fingers will advance simultaneously, and if rotated in the opposite direction they will retreat. Adjustment of the spring-fingers may thus be easily and quickly effected, so that different widths of paper can be accommodated.

It is to be understood that I do not limit myself to the precise construction herein shown and described, but consider myself entitled to all such variations as come within the spirit and scope of the invention.

. Having thus described the invention, what is claimed as new is In a .paper-gripperfor printing-presses, the combination with a frame, of separate screws .journaled in said frame having oppositely inclined screw-threads, both of said screws carrying clutch members, and one of the screws being adapt-ed for longitudinal movement whereby the clutch members can be specification in the presence of two subscribthrown either into or out of engagement, a ing witnesses. catch adapted to connect with the nmwrble EZRA CAMPBELL screw, and gripping-fingers, one belng oper- 5 ated by one screw and the other by the other \Vitnesses:

screw. GEO. B. BAKER, In testimony whereof I have signed this l FANNIE DORR.

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