Patent GB-191017391-A (GB)
Title: Improvements in or relating to Marking or Stamping Machines.
IPC: B41K3/40
Filed: 1910-07-22
Granted: 1911-07-20
Abstract: 17,391. Lanston Monotype Corporation, [Bancroft, J. S, and Indahl, M. C.]. July 22. Embossing and stamping. - An automatic machine for stamping distinguishing marks on articles such as the type matrices described in Specifications 8633/99 and 4726/05, has blank-feeding means which deliver blanks from a galley into a passage where they are engaged by positioning and gauging plungers and held while stamped by dies actuated by spring-impelled hammers; they are then pushed through a trimming-die to remove burrs and ejected on to a receiver galley, means being provided to stop the machine when a given number of blanks have been fed and to suspend the action of the hammers if no blank is present in the die. The blank-feeding means comprises a galley 5, Fig. 20, in which the blanks are urged by a pusher 12 into a channel 10, the galley having a spring-pressed gate 6 for closing it while the blanks are assembled. A pusher 16 drives one blank at a time through the channel 10 into a passage in the machine; at the end of each batch of blanks, markers 18 are placed in the galley, these markers being taller than the blanks and preferably being the dies which have previously operated upon the blank. A detector plunger 19 moves parallel with the plunger 16 but in a higher plane; it misses the blanks, but it meets the markers and stops the machine. The plunger 16 delivers the blank into a passage in a guide-block 20, Fig. 7, and above a positioning plunger 60; a gauging-plunger 61 then descends, and the plunger 60 lifts the blank into the embossing die 22 against the plunger 61. After embossing, the two plungers move upwards and drive the blank through a trimming-die 40 into a passage, from which it is ejected by a plunger 48, Fig. 2, on to a receiving galley 47. The die consists of an angular anvil-block 22, Fig. 10, and a punch block 24 carrying marking-punches adapted to mark two adjacent sides of the blank; the block 24 is detachably mounted on a pivoted carrier 29 held in operative position by a spring bolt 31, Fig. 7, and capable of being lowered to facilitate inspection of the punches. Two spring-held plungers 34 are mounted in the carrier and transmit the blow from the hammers to the punches. The spring-impelled hammers 61x, Fig. 5, are mounted on bell-crank levers 63 and are held in retracted position by latches 66; the hammers are retracted by links 120 connected to a bell-crank lever 119 operated by a cam-operated link 122, this action taking place before the positioning- plunger 60 advances the blank into the die. The latches 66 are released, preferably one just after the other by allowing slight lost motion in one, by links 123 connected to a bell-crank lever 124, one being operated by link 120 in returning by means of a pivoted latch 128. If a blank has not been inserted in the die, the plunger 60 moves up an abnormal amount, and a collar 130, Fig. 7, engages a lever 131 which withdraws a spring-pressed rod 133; this rod carries a projecting-piece 137, Fig. 5, which pivots the latch 128 and thus prevents the link 120 from moving the link 123, so that the hammers do not get released. The main shaft 70, Fig. 2, of the machine is driven through a one-revolution clutch 75, the unclutching stop of which can be withdrawn by a pedal 81 so that the machine runs continuously so long as the pedal is lowered. The machine is stopped, when the detector plunger 19 meets an obstruction, by connecting the plunger 16 to a lever 89, Fig. 21, and the plunger 19 to a lever 92, which levers are pivoted together and act as a pair of floating tongs; if the plunger 19 meets with no obstruction, both levers move about the pivot 89<a>, but if obstruction is met, the fulcrum of the lever 92 moves to the point of connexion with the plunger 19 so that the motion of the plunger 16 transmitted by pivot 89<b> causes a movement of the link 80 and allows the unclutching stop to come into action. The timing of the various portions of the machine is obtained by camshafts, and a hand-wheel 150 is provided to facilitate setting, a brake preventing this wheel from being turned in the wrong direction.