Patent GB-456369-A (GB)
Title: Improvements in or relating to stamping or embossing machines
IPC: A43D95/14
Filed: 1935-05-09
Abstract: 456,369. Embossing or stamping machines. MILLMAN, C. H., and DOVE, G. H., Standard Works, Evington Valley Road, Leicester. May 9, 1935, No. 13722. [Class 100 (ii)] In an embossing or stamping machine more particularly for marking boots and shoes by means of an electrically-heated die, the operation of the die is first controlled by one cam to cause it to contact with the work and then subsequently is controlled by another cam adjustably secured to the first cam, the second cam causing the release of the die after a predetermined interval which can be varied by altering the angular relationship of the two cams. The die is operated by a lever a from an eccentric b on a shaft c which for direct operation without dwell is coupled by a 2 to 1 gearing i<1>, i to a sleeve carrying a clutch g adapted to engage the driving pulley d. A projection o on a spring-controlled rod n actuated by a treadle and engaging a cam member l on the sleeve, normally prevents engagement of the clutch g, but depression of the treadle withdraws the projection o and allows the sleeve f to be moved by a spring h to cause engagement of the clutch g. After one revolution of the gear i and half a revolution of the gear i<1>, the die is in contact with the work and the wide part of the cam adjacent to the projection o. To prevent withdrawal of the clutch g and so that the machine can complete one cycle of operations, the projection o is kept in inoperative position by the engagement of a projection p<7> on a cam disc p<1> with a roller p<6> on the rod n, the disc p<1> being adjustably coupled to a fixed plate p<5> on the shaft c by a spring-pressed pin p<3> engaging one of a series of holes p<4> in the disc p<1>. The mechanism for causing the die to be held in contact with the work for a constant but adjustable time comprises a sleeve f<1>, clutch g<1>, and cam m operated by a treadle rod n<1> similarly to the sleeve f. A small gear k on the sleeve f<1> engages a large gear k<1> on a sleeve c<1> freely rotatable on the shaft c and adapted to be coupled to the cam disc p<1> by a spring-pressed pin p<2> on a cam p fixed thereto engaging one of the holes p<4> in the disc, the pin p<3> being disengaged. A cam q on the sleeve c<1> is adapted, by engagement withthe roller q<1> of the rod n<1>, to hold the projection o<1> in inoperative position while the sleeve c<1> makes one revolution, On depression of the rod n<1>, the clutch g<1> becomes coupled to the pulley d so as to drive the sleeve c<1> and rotate the cams p, p<1>. A projection p<8> on the cam p engages the roller p<6> on the rod n so as to disengage the projection o and allow the clutch g to operate the press. On completing one revolution, the high part of the cam engages the projection o and withdraws the clutch g thus stopping the parts a, b with the die in contact with the work. The die remains in this position until continued rotation of the sleeve c<1> causes the projection p<7> on the disc p<1> to engage the roller p<6> and release the projection o, when the operation of the machine will be completed. The period of the dwell of the die is determined by the position of the pin p<2> which sets the spacing of the projections p<7>, p8.