Patent GB-545067-A (GB)
Title: Improvements in box-making machines
IPC: B27M3/36
Filed: 1941-06-13
Abstract: 545,067. Stapling machines; box-making machines. STAPLING MACHINES CO. June 13, 1941, No. 7490. Convention date, Aug. 1, 1940. [Class 89 (iii)] [Also in Group XVII] In a machine for stapling binding wire to box or crate parts to produce foldable box or crate blanks, a conveyer moves the blanks under a stationary housing containing the stapling mechanism, but the staple formers and drivers move with the work during a staple driving operation. Each driver reciprocates in a guide in its former, and both are pivotally mounted so that they can swing with the moving work while the driver is driving the staple. The work is supported against the thrust of the driver by means automatically adjustable in accordance with the thickness of, and movable with, the work. Clinching means for the staples is similarly supported and moved, a pair of clincher plates moving in opposite directions to clinch the staple legs in opposite directions. The work conveyer comprises a flexible band trained over a wheel at each end, and having its ends clamped together. Three such bands 21, 21a, 21b, Fig. 30, of steel, are formed with equidistant holes 22, Fig. 48, which engage studs on a driving wheel at one end and an idle wheel at the other end of the conveyer. The ends of the band are coupled together by blocks 25, each in two parts held together by a screw 29, Fig. 47, which maintains pins 27 in recesses 28 provided at the ends of the band. The three bands have horizontal supports 35, 57, 49, Fig. 30. The cleats c are supported by longitudinal members 38, 47 which can yield downwardly against - springs, and the boards b by the cleats and a spring supported blade 373. Another blade above the boards at the stapling position may be swung out of the way for the insertion of new boards by depression of a treadle. The work-pieces are spaced on the bands by blocks 326, Fig. 36, clamped to the bands by screws 330, each carrying a spacing member 332 for the cleats and this carrying a blade 337 for the boards. The blocks on one band carry trip studs 343 co-operating with mechanism comprising a swinging member 410, Fig. 30, carrying cam surfaces adapted to be engaged by the studs to start and stop the stapling mechanism. The staple formers and drivers are actuated by rockshafts 138, 143, Fig. 3, actuated by cams on a main shaft 59. An electric motor 62 continuously drives a pulley 60 rotatable on the shaft 59 but moving with a pinion driving a sprocket housing clutch mechanism of the kind described in U.S.A. Specification 2,130,486..'The clutch is controlled by a solenoid, and the conveyer drive includes an interchangeable pinion 79 so that the space between consecutive staples may be varied. The shaft 59 is clutched to the pulley 60 by anti-clockwise swing of a rockshaft. 92, Fig. 53, controlled by an arm 113 pivoted to one of a pair of toggle links 114, 116, the upper end of which is pivoted to a second pair of toggle links controlled by a solenoid. The collapsing and straightening of the toggles is controlled by a solenoid connected to a rock lever 122 forming one of the upper toggle links. When the toggles are in their straightened position a cam 119 on the shaft 59 rocks the shaft 92 to stop the shaft 59.- Wire for the staples is contained on reels 150, Fig. 3, mounted side by side on swinging arms to permit empty reels to be replaced. The wire is fed by rods driven from the shaft 59. The binding wire is on similarly mounted reels 179, and is fed at a slightly higher rate than the speed of the conveyer bands by grooved pulleys about which the wire takes an S turn. When the wire becomes slack it slips, slowing the feed. The staple formers and drivers swing with the work during the driving of the staple and then return to initial position. The stapling units are adjustably secured to cross-bars 185, Fig. 14, and comprise a staple former 216 and a driver 236 guided in the former. The.driver and former are each pivoted to their actuating members to allow them to be swung by the travelling work while the driver is pressed hard down on the staple. To -form the staple, a loop bar 232, Fig. 17. is held in operative position during the descent of the former to bend the wire thereabout by a cam 243 on the driver. A cam surface 235 on the former swings the loop bar out of the way. Immediately prior to the driving of the staple the work is pressed against a lobe 247, Fig. 14, on the stapling unit by a wedge 281 urged to operative position' by a spring and retracted, when the staple is driven, by a cam. The outside clinchers each comprise a plate above the wedge urged to the right by a spring and resting on rollers so that it can travel with the work while the staple is driven. The inside clinchers each comprise slides 307, Fig. 25, longitudinally grooved, raised by a wedge mechanism similar to that of the outside clinchers, and moved by cams on a shaft 162, one clincher in the direction of work feed but at a higher speed, and the other in the opposite direction. The clinchers are adjustable as a whole for varying thickness of work. The controls are operated by solenoids, and a suitable electric circuit is described.