Patent GB-190801070-A (GB)
Title: Improvements in or relating to Machines for Rounding or Trimming the Soles of Boots and Shoes.
Inventor: BOULT ALFRED JULIUS
Filed: 1908-01-16
Granted: 1909-04-16
Abstract: 1070. Boult, A. J., [United Shoe Machinery Co.]. Jan. 16. Soles; paring.-Relates to sole-rounding machines of the type in which a trimming-knife is caused to travel round a pattern by rotating either the pattern or the knife support, and consists in the provision of adjustable change-speed mechanism including separate high and low speed drivers for changing the speed of the driving-mechanism from high to low as the knife is passing an abrupt angle in the pattern, such as at the ball line, and then back from low to high after such a point has been passed. The means for clamping and rotating the work and pattern, and the means for mounting and actuating the knife, are the same as those described in Specification No. 18,954, A.D. 1902. The rotary knife-supporting table 8, Fig. 5, is driven by bevelgearing 21, 22 from a shaft 20, to which is secured a driving-sleeve 23, This sleeve is in the form of a clutch member adapted to be engaged by one or other of two loose clutch members 24, 25. The clutch member 24 is a continuously-rotating pulley, while the member 25 is a gear-wheel coupled-up to the pulley by reducing-gears 34, 35, 38. The members 24, 25 are adapted to be forced into engagement with the sleeve 23 by wedge-blocks 39, 40, which are actuated in unison but in opposite directions by a rock-shaft 37 ; movement of either loose member is transmitted to the other through thrust-rods 33. The rock-shaft 37 carries a loose member having an arm 68, which is connected up to a rock-shaft 59 surrounded by a spring 58. This loose member is also provided with a depending arm 69, Figs. 5 and 7, adapted to be forced against a depending arm 70 rigidly secured to the shaft 37. When the rock-shaft is released, the spring 58 actuates the rock-shaft 37 in one direction through a direct thrust of the arm 69 against the arm 70, and in the opposite direction through a spring 72. The rock-shaft 37 is normally held in a position in which both the clutch members 24, 25 are inoperative, by the engagement of a roll 74 carried by a pivoted controlling-lever 75 with an arm 73 projecting from the rock-shaft. This controlling-lever is held in normal position by a spring-pressed latch 81, which hooks over a roll 82 carried by an arm 83 projecting from the hub of the lever. A spring- operated brake, consisting of a roll 87 adapted to engage a cam-surface 86 at the back of the latch 81, prevents rebound of the lever when it is operated to throw the driving mechanism out of operation. The lever 75 is also coupled-up to a brake shoe 90, Fig. 5, and in its normal position it holds this brake shoe in engagement with a braking-surface 91 on a flange 30 of the driving-sleeve 23. When the driving-mechanism is to be thrown into operation, the lever 75 is lowered to release the shaft 37, and is held in its operative position by the engagement of an arm 102, Fig. 7, with the underside of a latch arm 103 loosely pivoted on the upper end of the shaft 59. When, however, the rounding operation has been completed, a cam secured to the table 8 trips the latch to release the lever 75, so that the driving-mechanism is thrown out of operation again. The means for slowing-down the table 8 consists of an adjustable cam carried by the table and adapted to engage an arm 110, which is connected to the shaft 59 by a spring-pressed pin mounted in an arm 113 projecting from the shaft. This pin is adapted to engage one of two holes in the arm 110 according as the cam is required to be operative or inoperative. When the cam is operative, it actuates the shaft 59 to cause a change from the high to the low speed driver, and then back again to the high. Specification No. 6001, A.D. 1909, is referred to.