Patent GB-510700-A (GB)
Title: Improvements in or relating to fastener inserting machines
IPC: A43D79/00
Filed: 1938-01-04
Abstract: 510,700. Slugging machines. BRITISH UNITED SHOE MACHINERY CO., Ltd., and ELLIOTT, H. E. Jan. 4, 1938, No. 171. [Class 89 (iii)] A slugging machine is provided with means for lowering the horn, for work-feeding purposes, and with means for depressing the horn by a further amount, which is independant of the thickness of the work, for work-removal purposes, the second means comprising clutchreleasing and brake-applying mechanisms and being designed to bring the main shaft to rest rapidly, with the horn in the work-removal position, even when the machine is run at very high speeds. The stem 25 of the horn 19 is slidable in a slide 29, which itself is slidable in a guideway 31 and is supported by a spring to press the work against an abutment 17. The stem 25 is lowered, for work-feeding, by toggle levers 35 operated by links 41, 43, 47 and a cam 50. During work-feeding, the slide 29 is locked against the action of its spring by a pawl 61, Fig. 2, which engages a rack 57 on a slide bar 53. The pawl is so controlled, by a lever 65, links 71, 73, 79, and a cam, that the slide 29 is only locked during work-feeding, and at other times is free to be lowered by the horn spring to press the work against the abutment 17. The bar 53 is connected by a rod 51 to one end of a balancing lever, to the other end of which the slide 29 is connected. When the horn is to be depressed to work-removal position, the bar 53 is raised by a pawl 89 engaging a second rack 59 on the bar and carried by a slide 87. The slide is urged downwardly by a spring 97 and is raised by a rod 101 adjustably connected to a lever 103 adapted to be operated by a cam 111, Fig. 3. The cam acts through a lever 115 carrying a pawl 117 co-operating with a notch in the lever 103. While the machine is running, the pawl is held clear of the notch by a member 125 which, for this purpose, is moved to the right; Fig. 3, by a lever 129, 131, link 141, and trip lever 143. When a treadle is depressed to start the machine, a rod 151 rises to rock the lever 143 clockwise to disengage the pawl 117 from the lever 103, so that the horn-depressing lever 115 oscillates idly. The lever 143 is pivoted on a stud 147 carried by a lever 173 depending from a rock shaft 159, on which is pivoted a brake cam lever 163 operated by a cam 166 and having, at its lower end, an abutment 169 which can engage a spring-pressed slide 171 on the lever 143. The shaft 159 carries an arm 175, Fig. 1, connected to a block 177, movement of which engages or disengages a clutch 181 on the main shaft 13. Carried by the lever 173 is a rotatable shaft 187 having an eccentric pin 189 connected by a link 193 to one end of a brake band 197 which embraces the brake cam 166. When the treadle is pressed, the lever 143 is rocked, releasing the pawl 117 from the lever 103 and moving the slide 171 clear of the abutment 169, the clutch is engaged, and movement of the lever 173 under the influence of a spring 207 releases the brake band 197 from the cam 166. The machine then inserts fasteners, the levers 115 and 163 oscillating idly. When the treadle is released, the lever 143 rocks anti-clockwise. When the cam 111 reaches a suitable angular position, the pawl 117 engages the lever 103 to depress, the horn through the pawl 89. The abutment 169 then engages the slide 171, moving the lever 143, and hence the lever 173, bodily to the right to disengage the clutch and engage the brake band. The machine stops with the horn fully lowered and the pawl 89 engaging the rack 59. To ensure that the horn rises as soon as the machine restarts, in order to press the work against the abutment 17, a lever 215, 217 is connected to the treadle by a rod 213, and engages the pawl 89 to release the slide 53 when the treadle is depressed. Premature re-engagement of the pawl is prevented by a catch pawl 223, and a cam 93 holds the pawl clear of the rack while the machine is running. The pawl 117 and member 125 are formed and co-operate so that the slide 87 is lowered slowly when the machine starts. A safety handle 185 is secured to the shaft 187. By turning this handle to a vertical position, the lever 173 can be moved to an extent sufficient to disengage .the brake band, but not to engage the clutch, so that the machine can be turned over by hand, after depressing the treadle. Specifications 6971/98, [Class 89], 415,402, 432,502, and 490,856 are referred to.