Patent GB-190601157-A (GB)
Title: Improvements in or relating to Sole Pressing Machines used in the Manufacture of Boots and Shoes.
Inventor: BOULT ALFRED JULIUS
Filed: 1906-01-16
Granted: 1907-01-10
Abstract: 1157. Boult, A. J., [United Shoe Machinery Co.]. Jan. 16. Soles. - Relates to multiple-jack sole-pressing machines, and consists of means for ensuring that, when one jack is in operative position, the remaining jacks are in inoperative position. The machine illustrated is provided with two jacks 1, Figs. 1 and 2, and corresponding forms 2. Each jack 1 slides in grooves in a table 4, which reciprocates vertically in guides. The jacks receive their motions from levers 6, connected to levers 5, which are pivoted at the lower ends to the frame. The lever 5 is rocked by means of a latch 7, which has a slot 8 at one end to engage a pin on the lever 5 and is connected at the other end to a link 9 pivoted to the frame and provided with a cam-roll engaging a cam on a shaft 10. Each latch 7 is provided with a vertical rod 11 sliding in suitable guides and provided with two collars 12, 14. A spring 13 pressing against the collar 12 causes the latter, in its normal position, to hold the slot 8 in the latch 7 clear of the pin in the lever 5. Engagement with the lever 5 is made by depression of a treadle 15. Pressure is applied to the sole of a shoe by means of a toggle-lever 16 connected to a cam on the shaft 10 by a link 17<*>. The forms 2 are mounted in carriers and supported from a crosshead 17, so as to be capable, as usual, of a slight rocking movement. The cross-head 17 is locked in position by the interposition of a cam 22, mounted on a rock-shaft 23 and moved by a lever 24 pivoted at its rear end to the frame engaging a cam at its front end, and connected to the lever 29. by a long link 25. A spring 23*, Fig. 2, attached to the lever 24, swings the cam shaft 22 into operation. The cam shaft 10 is driven from the driving-shaft 31 through screw gear, connecting a shaft 29 with the shaft 31, and a worm 28 on the shaft 29 meshing with a worm-wheel. 27 on the cam shaft 10. On the shaft 31 is mounted a friction clutch consisting of a loose pulley 32 and a fixed conical portion 33. The pulley 32 is moved into contact with the portion 33 by means of levers 40, 44, and 43. The lever 40 is forked at one end to engage a block 41 secured to a rod 38, on which is mounted a sleeve 35 integral with two arms 36, 37. The rod 38 is pressed in the direction of the treadles 15 by a spring 39 placed between the sleeve 35 and one of the bearings of the rod 38. The arm 36 is at certain periods engaged by a cam 34, the effect being to move the rod 38 against the compression of the spring 39, and to free the pulley 32 from the clutch 33. When the lever 36 does not engage the cam 34, the spring 39 brings the friction clutch into operation. When a jack and form are under pressure, the arm 36 is moved inwardly to avoid the cam 34, and consequently to connect the driving-shaft and pulley. This inward movement of the arm 36 is produced automatically by means of a timing- mechanism, Figs. 3, 4, and 5. A worm 47 attached to a shaft 48 is rotated from the pulley 32 by a chain passing over sprocket-wheels 49, 50, the latter mounted on a short shaft 51. The shaft 51 drives a shaft 53 through spiral gear 52, and bevelgear 54 connects the shafts 53, 48. Parallel to the shaft 48 is a shaft 55, capable of longitudinal movement and supporting a pivoted tripper 56, provided at one end with teeth 57 adapted to mesh with the worm 47, and at the other end with a notch 58 to engage the arm 37 of the sleeve 35. A spring 45 tends to hold the teeth 57 in gear with the worm 47. A latch 60, acted on at its upper end by a spring, engages a projection 61 on the tripper 56, and holds the teeth 57 out of gear with the worm 47 until such a time as the jack and form are in a position of pressure, when a projection 63 on the worm-wheel 27 comes in contact with and displaces the latch 60, thus allowing the teeth 57 to mesh with the worm 47. The rod 55 is then moved longitudinally and the arm 37 pushed outwardly, with the result that the arm 36 is moved so as to avoid the cam 34, and consequently the clutch-actuating mechanism is brought into play, the tripper 56 again heldclear of the worm 47, and the shaft 55 returned to its original position. The duration of the time during which the jack and form are under pressure can be varied by means of an adjustable stop, which determines the initial position of the shaft 55. For throwing the cam shaft 10 into operation, the rear ends of the treadles 15 are shaped to co-operate with blocks 71 attached to the shaft 55, a longitudinal movement of the shaft 55 being produced on depression of the treadles. The present invention relates chiefly to a means of avoiding failure of the latches 7 to engage the levers 5 firmly. The arrangement illustrated in Fig. 6 is used. Each latch 7 is provided with a curved slot 72, which is engaged by a pin or roll at the end of a rockshaft 74. Links 76, slotted at their lower ends so as to engage pins on the treadles 15, are connected at their upper ends to oppositely extending arms on the rock-shaft 74. A depression of either treadle, therefore, positively moves the corresponding latch into operation and the other latch out of operation. The treadles are raised, after depression, by springs 1. Means of locking the jacks when in position to receive the boots is also shown in Fig. 6. A spring-pressed plunger 78 presses against a pivoted latch 79 mounted in a recess in the table 4. In the inoperative position, the latch 79 is pressed into a groove 80 in the jack, and the friction produced is sufficient to hold the jack until the actuating-mechanism is put into operation.