Patent GB-377309-A (GB)
Title: Improvements in or relating to machines for inserting fastenings or the like
IPC: A43D69/00
Filed: 1931-04-28
Abstract: 377,309. Nailing. BRITISH UNITED SHOE MACHINERY CO., Ltd., Union Works, Belgrave Road, Leicester.-(United Shoe Machinery Corporation; 140, Federal Street, Boston, U.S.A.) April 28, 1931, No. 12478. [Class 89 (iii).] Relates to machines for inserting fastenings or the like wherein a hole is formed in the work and a fastening is driven into it without intermediate feed of the work ; and comprises manually-controlled means for varying the stroke of a tool to form holes of varying depths, the length of the fastening to be driven being correspondingly varied ; improved means for imparting work-penetrating and driving strokes to a single tool ; improved means for feeding the strip of fastener material ; and improved clutch-controlling means operated by pressure of a work-piece against the fastener-driving nozzle. The machine described is particularly intended for the insertion of the paper pegs described in Specification 253,117, [Class 89 (iii). Nailing &c.], and comprises a column 12 and a head 36 in which a cam shaft 50 is mounted. An electric motor 14 drives the cam shaft through a vertical shaft 32 and a bevel gear 34. The latter meshes with a gear 58 on a clutch member 56 rotatable on the shaft 50. A clutch member 60 is slidable on the shaft 50 for cooperation with the member 56 and with a brake surface 66, and is formed with projections 68 meshing with projections 70 on a cam assembly 52. A spring 74 bearing against a collar 72 on the member 60 urges the latter to clutching position. A hub 78 slidable on the member 60 against an adjustable collar 76 has pins 80 engaged by hooks on a clutch lever 82. When the latter is vertical, the clutch members are disengaged. A tool 100 acting both as awl and driver is clamped to a carrier 104. The latter is reciprocated by teeth 134 on a lever 132 which is fulcrummed at 130 to a lever 112, a spring surrounding the fulcrum tending to rock the lever 132 in a direction to drive the tool 100 downwardly. The lever 112 is pivoted at its front end 110 to the head 36 and at its rear end to a link 114 which is pivoted at its lower end in a slot 116 formed in one arm of a bellcrank lever 118, another arm of which carries a roll engaging in a cam track 126. The effect of the latter is to rock the lever 112 up and down about its pivot 110 in each operative cycle. This causes the tool 100 to start its awl stroke at a lower point than its driving stroke, so that the strokes can be of the same extent. The strokes are produced by a lifting bar 156 and cam 150. To enable fastenings of two different lengths to be inserted, the position of the lower end of the link 114 in the slot 116 can be varied by means of a link 170 and lever 172. The latter is connected through a link 174, bell-crank lever 176, and link 180, to a treadle 184. Thus, control of the treadle, within limits defined by stops 192, 194, determines the extent of the stoke of the tool 100. The length of the fastening to be driven is varied in accordance with the extent of the awl stroke of the tool. The peg strip 300 is led from a reel 302 to the nozzle 162 by means of a vertically-reciprocating guide 304, Fig. 2. The strip is gripped against the guide 304 during downward movement of the latter by a dog 314 carried by a bell-crank lever 310. A second dog 322 prevents retrograde movement of the strip. The lower end of the strip passes into a passage in a shear member 338 which is reciprocated, to cut off a peg and carry it over the nozzle 162, by a rod 340. The guide 304 is reciprocated from the lever 112 through a link 352, bell crar.k 356, link 362, bell crank 364, and link 372. The setting of the treadle 184 thus controls the length of the peg which is fed. A further nitial control of its length is provided by an adjustable connection between the link 372 and bell crank 364. The dog 314 is disengaged from the peg strip when the machine comes to rest bv a nose 400 on the bell crank 310 being engaged by a lever 404 controlled by a crank pin on the cam shaft 50. The clutch member is moved to clutching position by its spring 74 when a latch 234, Fig. 4, for the clutch-lever 82 is released by the pressure of a work piece against the nozzle 162, acting through a bell crank 212, link 216, and bell crank 220. When the shaft 50 revolves, a cam track 262, acting through a roll 260 and rod 258, first straightens toggle members 254, 256, and finally acts through these members to move the lever 82 to declutching position at the end of one revolution of the cam shaft. The final act of declutching includes a partial breaking of the toggle members, to reduce the pressure necessary on the nozzle 162 to restart the machine.