Patent GB-333546-A (GB)
Title: Improvements in embossing presses
IPC: B26F1/40
Filed: 1929-02-11
Abstract: 333,546. Link, R. P. Feb. 11, 1929. Embossing - machines. - An embossing-press more particularly for cutter-crush embossing comprises a work-receiving platen 39 which is moved step-by-step across the fixed bed 31 of the press so as to bring different parts of the workpiece beneath the ram 14 and during such movement stresses a spring by which the platen is returned to its initial position. For this purpose, a rack 40, Fig. 6, is provided on the undersurface of the platen 39 and is engaged by a pawl 41 carried by a bar 42 reciprocated by cams 47 on a main cam-shaft 12 through levers 46 and a retracting spring 47<a>. A spring 45 upon which the pawl rests allows the pawl to be inoperative during its return stroke. As the platen 39 moves forward, it coils up a spring 52, Fig. 7., through the engagement of a rack 51 thereon with a pinion 50 fixed to a tubular shaft 48 attached to one end of the spring 52, the other end of which is fixed. A pawl attached to a spring- pressed rod engages a ratchet-wheel 55 fixed to the pinion 50 so as to prevent reverse movement of the platen 39, the pawl being released by means of a lever 61, after the platen 39 has been advanced a predetermined number of steps so as to allow the platen 39 to return to its initial position. In an alternative arrangement, the spring is mounted in a cylinder and is stressed by a plunger connected directly or indirectly to the platen 39. The cam-shaft 12 is mounted in the framing 11 and is driven by worm and wormwheel gearing 62, 63, Figs. 1 and 2, from a shaft 64 coupled by a clutch 66 to a driving shaft 65. Projections 13 thereon engage antifriction rollers 21 secured by a plate 23 to the upper surface of the ram 14 so as to apply pressure thereto. The ram 14 is raised by means of levers 27 operated by rods 29 engaged by cams 28 on the shaft 12, the cams 28 being so shaped that the rollers 21 are maintained in contact with the shaft 12. Laterally-extending integral or detachable lugs 16 guide the ram 14 on the framing 11. Means are provided for adjusting the platen 39 relatively to the bed 31 for various thicknesses of work and consist of a wedge-shaped plate 32 having a rib 33 engaging an oblique groove 38 on a block 38 movable laterally by means of a screwed spindle 36. The ram or the bed may be suitably heated. Stopping-arrangements. - The lever 61 for operating the platen-returning devices also releases the clutch 66 at the same time by engagement of a forked part 68 thereon with a sliding part of the clutch. In order to move the lever 61 to clutch-opening position after the press has made a predetermined number of strokes, a disc 71 rotating with the shaft 12 carries a pawl 72 having an extension riding on a fixed track 73 having one or more notches 74 allowing the pawl 72 to engage and move a ratchet-wheel 70 at intervals. An arm 77 fixed to the ratchet-wheel 70 is caused by the movement to engage a collar 78 on a rod 79 so as to move the rod endwise and, through an intermediate lever 80, throw the clutch 66 out and allow the platen to return to its interval position. By means of graduation marks on the wheel 70 and a pointer 76, the wheel 70 can be set to the required number of operations. An arm 83 adjustably fixed to the wheel 70 can be set so that by turning it until it abuts against the pointer 76 the wheel 70 can be reset to the same position easily. The operation of the lever 61 is also caused to operate a brake-band 90 on the shaft 64 through the engagement of a projection 86 thereon with a pin 87 on the tightening lever 88 of the band. A spring-pressed pin may be provided to engage a recess in the cam-shaft 12 so that it is always stopped in the same position. According to the Provisional Specification, the throw-out device may be operated by a rack which is fed forward by a pawl actuated from the ram.