Patent GB-403710-A (GB)
Title: Improvements in or relating to machines for operating upon sheet material
IPC: F16D13/02
Filed: 1932-06-01
Abstract: 403,710. Clicking-presses. BRITISH UNITED SHOE MACHINERY CO., Ltd., Belgrave Road, Leicester.-(United Shoe Machinery Corporation ; 140, Federal Street, Boston, U.S.A.) June 1, 1932, No. 15472 [Class 31 (i).] A clicking- press with radial presser arm mounted on a reciprocating post, an example of which is described in Specifications 22023/05, [Class 31, Cutting &c.], and 133,442, [Class 31 (i), Cutting and severing machines &c.], is providod with (1) means to relieve the post-actuating parts and cutting bed of excessive strain, (2) means for equalizing the pressure and depth of cut at any part of the bed, (3) means for varying the position of the arm on the post, (4) means for adjustably mounting the post and reducing friction between the post and frame, (5) a one-revolution clutch drive, and (6) a sliding mount for the motor to permit removal of the flywheel. The hollow post 12 is carried by a C-shaped frame 10 and is reciprocated by a rod 18 driven by an eccentric on the main shaft 20. The upper ends of the rod and post engage by a spherical surface 242, Fig. 15, and the weight of the post and arm is borne by a hemispherical ball joint 246 provided with an adjusting pin 250. The rod 18 can thus adjust itself to avoid excessive strain. The arm 14 and cutting-bed 16 overhang in opposite directions and are stiffened so that the sum of their deflections during cutting is constant for all positions of the die. This ensures uniformity of depth of cut and pressure by the die. The height of the bed is varied by screws 42 and worm gearing 56, 58, 59, Fig. 3, operated by a hand wheel 62. The bed is set by disconnecting a collar 68 and claw coupling 61 to free the worm 58, and levelling the bed by the worm 59 only ; the coupling 61 is then re-engaged, and the collar 68 secured to the shaft by pins 70. Downward movement of the bed is checked by a pawl 74, Fig. 4, and rack 78 on the shaft 60. The pawl is released by a cam face 84 on a lever 82, which can also be used to release the bed if the hand wheel 62 becomes locked by stalling of the machine. For this purpose a pawl 90 is fitted, and is normally held inoperative by a cam face 96 on the frame, and a pin 98. By turning the lever clockwise, the pawl 74 is raised and pawl 90 engaged with the rack 78, thus allowing the shaft 60 to be turned by the lever 82 to ease the pressure. To allow removal of the post, the lower end is carried in a bearing 105, Fig. 1, and the upper end is held in a semi-annular bearing 106 and cap 110, Fig. 5 ; part of the reduced end of the post in the cap is out away as shown by the relief 112 to reduce friction. The cap 110 is secured by wedges 120, 122, and wear is taken up by a set screw 136. The one-revolution clutch, Fig. 7, is operated by a starting handle 144, Fig. 1, fork 148, and links 154, 156, 158. Link 158 carries a plate 167 which engages a latch 164 on an arm 162 to lift the arm and thereby release a spring-pressed bolt 142 by which the clutch and flywheel 24 are connected. A cam 170 on the flywheel then trips the latch 164 by engaging the tail 168, the arm 162 falls and withdraws the bolt 142, and the machine makes one revolution. When power is off, the latch 164 is held inoperative by a rocker 186 connected by a rod 190 to the motor handcontrol 174, Fig. 1. The motor mounting is slidably suspended on the frame to facilitate removal of the driving pinion from the teeth on the flywheel when it is necessary to remove the wheel.