Patent GB-322263-A (GB)
Title: Hand stamp machine
IPC: B41K1/42
Filed: 1928-09-18
Abstract: 322,263. Du Belie, C. S. Sept. 18, 1928. Hand-stamps; inking-apparatus. - In handstamps of the kind wherein types or type-wheels mounted on a reciprocating plunger are inked by inking-apparatus mounted on an oscillating frame, the oscillating frame is provided with one fulcrum which reciprocates with the plunger, and a second fulcrum which provides a shifting pivotal connection between the oscillating frame and the main frame of the hand-stamp. The inking apparatus described is provided with a reservoir roller of the kind described in Specification 332,264. The plunger C, Fig. 4, is provided on two sides with a laterally-projecting pin c which extends through an aperture in one of the side plates of the oscillating frame E and engages within a vertical groove a on the adjacent inside face of the vertical limb of the main frame A. Links D pivoted at their lower ends to an intermediate part of the side plates of the oscillating- frame are pivoted at their upper ends to the main frame. The vertical grooves a are disposed at one side of the longitudinal centre line of the vertical limbs of the main frame and offset relatively to the upper pivots of the links so that the oscillating-frame is raised by the depression of the plunger, the type being inked by the inking-roller I during this movement. In another form, Fig. 9, a screw or pin r extending inwardly from each vertical limb of the main frame A extends within a slot R provided in the adjacent side plate of the oscillating-frame E<1>, the slot being disposed at an acute angle, to a vertical groove d<1> in the main frame A when the oscillating-frame is in its raised position. The grooves a<1> receive and guide the ends of the pins c which project from the plunger or impressionhead and extend through apertures in the side plates of the oscillating-frame. The plunger may be locked in its lower position, with the oscillating-frame raised, by means of a disc w, Fig. 6, which is pivoted eccentrically on the underside of the upper crosspiece of the supporting frame A and adapted to be rotated to engage within a notch in the. plunger-rod B<1>. To admit light to the lower portion of the supporting-frame the side portions are provided with U-shaped apertures. Rubber pads are provided on the underside of the transverse upper portion of the frame A to meet the plunger on its upward movement and prevent noise and jarring. The inking-apparatus comprises a reservoir roller F supported within bearings in the side plates of the oscillating-frame E and arranged to rotate in contact with an inking- roller I mounted between a pair of rocker plates G which are disposed between the ends of the reservoir roller and the side plates of the oscillating-frame. The rocker plates G fit loosely upon the trunnions of the reservoir roller and are each provided with a slot to receive the opposite ends of a rod h secured between the side plates of the frame E and connected to one end of springs H which are connected at their other end to pins on the rocker plates, whereby the inking- roller is normally held in a position to ink the type or printing-wheels when the oscillating- frame is lowered. To prevent the inking-roller from contacting with the types, a cam-shaft K journaled in the side plates of the oscillating- frame carries cams k which fit within openings in the rocker plates, and the cam shaft is provided at one end with either a lever or a knurled operating-head and a resilient locking-device which holds the cam-shaft in a set position. Rotary movement is imparted to the reservoir and inking-rollers by a pawl pivoted on one of the links D and arranged to engage and turn a ratchet.- wheel on the shaft of the reservoir roller at each upward movement of the oscillating-frame, a gear-wheel coaxial with the ratchet-wheel serving to drive a gear-wheel on the inking-roller. A distributing-roller may be disposed between the reservoir and inking-rollers, or the reservoir roller may apply ink directly to the type or typewheels. The reservoir roller may be provided with a shield or cover consisting of inner and outer members which co-operate to enclose the roller when the machine is out of use, one member being rotatable relatively to the other to expose the roller. A shield or apron-like cover Z may be provided to protect the plunger from dust &c.