Patent GB-189914954-A (GB)
Title: Improvements in Stencil Printing Machines.
Inventor: MILLS BENJAMIN JOSEPH BARNARD
Filed: 1899-07-20
Granted: 1899-10-07
Abstract: 14,954. Mills, B. J. B., [A. B. Dick Co.]. July 20. Copying documents &c.-Relates to apparatus for use in obtaining copies by means of flexible stencils, and especially for use as a mimeographic copying-apparatus. The stencil sheet is secured by clips 24, or other suitable means, upon a pad 20 mounted upon a curved perforated plate 13, which is carried by two parallel toothed discs 12. These discs are mounted in axle-boxes 10, fitted within slotted bearings 9, and connected by links 26, 30 to an oscillating shaft 29, which can be operated by hand so as to raise the toothed discs out of engagement with racks 5 on the paper carrier 4. One end of the pad 20 is secured to a bar 11, and the opposite end is passed through a longitudinally-slotted shaft 21, which is locked in position by a spring pawl and can be rotated by hand so as to stretch the pad, when necessary. During the operation of the copying-apparatus, a suitable comparatively-thin ink is supplied to the inner surface of the sheet 13, and to the pad 20, by means of a brush or sponge. The sheets of paper to be printed are fed by hand from a table 6 against stops 49, which normally lie within recesses formed in the forward end of the table 6, and are carried by rods 50 mounted adjustably upon an oscillating shaft 51. A gauge 54, of the usual kind, is employed for the purpose of regulating the lateral positions of the sheets. The paper carrier or frame 4 is mounted to slide upon the side frames 2 of the copying-apparatus, and is reciprocated by means of the discs 12 and racks 5. Upon the right-hand end of the frame 4 are blocks 40 having inclined faces 42, 57, and between these blocks are paper grippers, each of which comprises two fingers 60, 62, pivoted together ; the lower finger 62 is normally forced upwards by a plate spring, and its rear end nuts upon a segmental portion of a rocking-shaft 64, which is actuated by means of an arm 65. During the oscillation of the shaft 64, the grippers are opened for the purpose of gripping a sheet, and are then allowed to close under the influence of the plate springs. The movements of the arm 65 are limited by stops 67 secured to a slide mounted upon the frame 4 and adapted to be moved relatively to the frame, by means of a pivoted stop-lever 70 and a fixed stop 73, which act successively during the reciprocation of the frame 4. Before the grippers are opened by the action of the stop-lever 70, the stops 49 are raised out of the way of the advancing sheet by means of the inclined face 57, which strikes against an arm 56 secured to the shaft 51. An impression roller 33 is carried by bell-crank levers 32 connected to adjustable springs 35, which force the roller against the paper. The roller 33 may be drawn away from the stencil by means of eccentrics 37, which are operated by hand. During the return stroke the roller 33 is forced away from the stencil by means of blocks 41 on the frame 4, and is held in position by latch 43 until these are released by the action of the inclined faces of the blocks 40.