Patent GB-165385-A (GB)
Title: Improvements in and relating to pulling-over machines for use in the manufacture of boots and shoes
IPC: A43D13/00
Filed: 1919-12-12
Abstract: 165,385. Denne, M. T. Dec. 12, 1919. Pulling-over.-In a pulling-over machine as de. scribed in Specification 164,777, means are provided whereby, by a slight actuation of a control means, the pincers are caused firmly to grip the upper, by a further but incomplete actuation of the control means the pincers are caused to relax their grip, and by complete actuation of the control means the pincers are opened. A further feature of the invention is the combination in a unit assembly of the pincers mechanism, an upper clamp, and a tack-driving device. As shown in Fig. 1, the vertical bar 26 is connected by a chain 28 with a lever 71 which, in the case of the toe unit, is connected by a link 73 to a treadle 75, the side units being similarly connected by a link 74 to a treadle 76. In operation, when the treadle 75 is slightly depressed, the bar 26, Fig. 2, moves downwards, the pawl 30 tripping the spring catch 24 and allowing the rod 17 to move upwards to close the. pincers. A further depression of the treadle causes, by engagement of lugs 22, 29, the rod 17 to move downwards and release the pincers, which are again closed on release of the treadle. Full depression of the treadle forces the lug 21 into engagement with the catch 24, thus maintaining the pincers fully open. Upon now releas. ing the treadle the mechanism assumes its initial position. As shown in Fig. 2, the pincers, comprising a fixed jaw 5 and a movable pin 9, are carried on a main pincers bar 1 provided with a trunnion-pin 2 supported in adjustable bearings in the machine. At its upper end the bar 1 carries an upper clamp comprising a saddle-piece 35 to which the clamp proper 36 is secured, the saddle and clamp being normally maintained in their advanced position by a spring 39. The movement of the clamp, relative to the pincers, is determined by means of a block 43, pressed out. wards by a spring 42, and adjusted in position on the stud 41 by a milled nut 45. The tack-driving mechanism comprises a driver-bar 48, carried in a slot in the bar 1 and provided with a driver 47, operating in a slot in the fixed jaw 5 of the pincers and being urged upwards by a spring 66. A bar 55, slidably secured on the bar 1, has pivoted to its upper end a catch 51 adapted to engage a shoulder 50 on the block 49 adjustably secured on the driver-bar 48, the catch being maintained in operative position by a spring 53 engaging with the tail-piece 54. At a suitable moment, a spider 82, carried on the rod 80 of the machine and adapted to engage a recess 56 in the bar 55, is caused to descend, thus pulling down the driverbar 48, which is released to drive the tack by the tripping of the catch 51 by an adjustable stop 58. To adjust the distance to which the tacks are driven, a slotted wedge 60 is provided, this wedge being adjustably secured in position by a nut 61. The tacks are conducted from a supply mechanism 92, 93, driven from the main cam cylinder of the machine by a rod 91, through a flexible conductor 94 to a tack passage 62 in the upper clamp 36, which, when the parts are in the normal position, guides the tacks into the driver passage in the pincers jaw 5.