Patent GB-543365-A (GB)
Title: Improvements in or relating to pressing, stamping or like machines
IPC: A43D95/14
Filed: 1940-08-19
Abstract: 543,365. Embossing machines. BRITISH UNITED SHOE MACHINERY CO., Ltd. (United Shoe Machinery Corporation). Aug. 19, 1940, No. 13178. [Class 100 (ii)] A pressing or stamping machine for stamping designs &c. on articles such as shoe soles, in which two or more dies 23, 24 mounted in a turret act in succession upon the work which is supported on the horn 16 of a work support 18, is constructed so that the supporting capacity of the work support can be adjusted so as to be of the required value for different sizes of dies, the value being automatically changed with adjustment of the turret to bring a new die into operation. The invention is applied to a machine of the kind described in Specification 28661/03, [Class 100], and the turret is mounted in a head 12, Fig. 2, which is reciprocated vertically by means as described in the aforsaid Specification. As the die 24 moves downwardly from the position shown in Fig. 1, a gear wheel 133 is rotated to operate means for rotating the turret and also to control the degree of opening of a relief valve 80, Fig. 5, which controls the fluid resistance offered to a plunger 84 connected to the work support 18. A pin 46 on wheel 133 engages a slot in a rod 47 which rotates a three-armed bell-crank lever 38 counterclockwise when the pinion 133 has rotated nearly half a revolution, by which time the die 24 has operated on the work and commenced to rise. The rod 47 acts through a spring 126 upon the lever 39 and the arm 38 of the lever operates a turretshifting fork 34 to bring the die 23 into operative position. This action however is controlled to take place only when there is no danger of the moving dies coming into contact with any part of the workpiece, and the control is effected by means of an adjustable T-shaped member 56 which prevents an L-shaped block 33 connected to a crankarm on the turret from being moved by the fork 34 until the head 12 has been raised suffciently far to prevent contact of the die with the work. The member 56 is normally raised by a spring into contact with an adjustable stop and owing to the spring mounting no harmful effect occurs if the die commences to move downwards before the turret is fully rotated. The movement of the turret is limited by screws 44. The lever 38 is connected by a link 106, weighted lever 108, and link 112 with means for controlling the degree of opening of the relief valve 80, Fig. 5, and therefore of the supporting capacity of the support 18. The valve stem 86 screws into a nut and the stem is rotated by a displaceable rod 92 fitted with a rack which operates a pinion 90 on the stem 86. The rod 92 is connected to a screwed sleeve 110 on which are two adjustable nuts 111 which are engaged by a pin 113 on the link 112 which reciprocates inside the sleeve, the sleeve being slotted to receive the pin. The nuts 111 can be set so as to control the degree of opening of the valve, and they can be set so as to have no effect on the valve when the dies are of equal size. A bye-pass passage 118 is formed in the valve to prevent stalling of the device if the valve 80 is shut completely. The means for operating the turret and the device for adjusting the valve 80 may be put out of action when it is desired to operate one die only, since the driving-pinion for the gear 133 may be declutched by withdrawing a knob 160 and rotating it to cause a bar 164 to hold the clutch pin 156 out of action.