Patent GB-284220-A (GB)
Title: Improvements in or relating to fastener-inserting machines for use in the manufacture of boots or shoes
IPC: A43D69/02
Filed: 1928-01-24
Abstract: 284,220. United Shoe Machinery Corporation, (Assignees of Goddu, G.). Jan. 24, 1927, [Convention date]. Loose-nailing.-In a fastener-inserting machine for boots of the type provided with a gang of fastener-inserting devices for driving a series of fastenings into a lasted shoe at a curved portion thereof, the members of the gang being relatively movable to cause the gang to take up a position appropriate to the form of the said curved portion, the devices comprise fastenerdriver supports arranged to yield independently of one another laterally to correspond to the contour of the shoe edge and also vertically to allow for irregularities in the surface of the work. Means are also provided for controlling the engagement of the shoe edge with the driver supports to prevent damage to the shoe, and for preventing operation of the machine before the work is properly positioned. As applied to a loose-nailing machine for operating around the toe end of an outsole, a semi-circular bracket 14, Fig. 3, on the machine carries by universal joints a series, in this case nine, of inserting sections I. Each inserting section includes a tubular portion 24, Fig. 6, sliding within the sleeve portion 22 of a ball 20 mounted in a socket 16, 18 in the bracket 14. The tubular portion 24 is part of a driver-support or work-engaging member 26 within which moves a driver 46 and which is normally held downwardly by a spring 30 to an extent limited by a sleeve 32 on the support 24 engaging the socket 18. On an extension 34 of each support is a sole-face-engaging part 36, Fig. 9, provided with a tack-nozzle 38 and an adjustable edge gauge 40. The driver 46 works in a passage 54 in the extension 34 and tacks are supplied to the nozzle 38 by a tube 60 and retaining quill 56. The stroke of the driver is limited by a cushioned collar 62 adapted to engage the sleeve 32, Fig. 3. and the driver 46 is normally urged downwardly bv a torsion spring 72 acting on a lever 68 and link 66. For tensioning the spring 72 and then releasing it for the driving stroke, the collar 62 has a shoulder 75 engaged by a pawl 76 pivoted on a plate 78 which carries the pawls for actuating all the drivers and is secured to a bar 80 reciprocated vertically by a link 86, bell-crank 88 and cam 90 on a shaft 92, Fig. 1, driven from a shaft 98 under control of a treadle 100, rod 102, and clutch 94. With the machine at rest, the plate 78 is raised and the springs 72 are under tension. Upon depression of the treadle 100 the bar 80 and plate 78 are raised further, until tails on the pawls 76 engage stop screws 106 so that the pawls are disengaged from the shoulders 75 and the drivers descend. Near the end of the driving stroke the collars 62 engage the sleeves 32 to force the supports 34 against the work with additional pressure during clinching. Each support 34 has an arm 108, Fig. 9, carrying a pin 110 guided in a slot 112 in a horizontal plate 114. The rear centre support only is held fixed against lateral movement by two pins 115, Fig. 8. The nozzles of the supports are connected by links 116, and the links of the two front supports are connected to torsion springs 112 which act to' draw all the supports, except the fixed rear one, into a position for operating on the smallest work to be nailed. To give a preliminary location of the supports, and thereby save damaging pressure of the work against the gauges 40, a template 154, corresponding in outline to the shoe to be nailed, is arranged to spread the supports before the work is positioned. The template is carried by a lever 132 which is moved by a lever 130 and the plate 78, when the machine is at rest, to spread the supports 34. The lever 132 is locked by a. latch lever 140 and a bar 162 which is linked to the treadle rod 102. When the treadle is depressed after the work is positioned, the latch 140 is depressed, releasing the lever 132 and allowing the supports 34 to move in to engage the work under pressure of the springs 72 and 122. The latch is reset by the bar 80 during its ascent to initial position. To guard against operation of the machine before the work is in position, the rear centre support 34, Fig. 3, has a work gauge 170 carried by a slide 172 which acts to lock a bar 182 connected to the bar 162. Only when the gauge 170 has been forced back by engagement with the work is the bar 162 free to move and the treadle free to be depressed. A preliminary adjustment of the position of the supports 34 may be made by means of arms 192, Fig. 9, rack segments 194 and handle 204, the arms 192 acting on the pins 110 of the front supports. A jack 31, Fig. 1, is removably and slidably carried by a table 210 adjustable on a slide 212 which is reciprocated to an adjustable extent, to press the work against the tack nozzles by links 224, 230 and cam 94. A tack distributor D, for example of the form described in Specification 12304/03, [Class 17, Boots &c.], is oscillated.by the bar 80 through a rack 242 and pinion 244. The latter drives a shaft 250, Fig. 10, having a pinion 252 in mesh with a rack 254 on the tack drum 240. To reduce the shock occurring when the movements of the drum are reversed, the pinion 252 is loose on the shaft 250 and is normally clutched to it by a pair of three-armed levers 260 and a spring- pressed washer 270. Excessive pressure on the pinion 252 moves the levers 260 against the spring 272 and temporarily declutches the pinion. In use, a jacked shoe is moved into position until the toe end engages the gauge 170 to release the clutch rod 102. The treadle is depressed, starting the machine and releasing the latch 140 and template 154 so that the nozzles move into engage the work. The jack is elevated, the driver supports 26 yielding against the springs 30 to allow for irregularities in the work surface. The bar 80 on rising releases the springs 72 to cause the drivers 46 to insert previously positioned fasteners, the collars 62 giving additional pressure on the work during the clinching operation. Downward movement of the bar 80 followed by its rise to normal position finally causes the plate 78 to reset the template 154 in spreading position, and to move the pawls 76 to retension the springs 72.