Patent GB-225071-A (GB)
Title: Improvements in or relating to nailing machines
IPC: B27F7/02
Filed: 1923-12-07
Abstract: 225,071. Singer Manufacturing Co., Ltd., and Raworth, A. S. Dec. 7, 1923. Machines for making boxes, A machine for assembling and nailing together the members of box-like structures, particularly drawers, includes manual and automatic means for pressing together the members to be joined, nail feeding and driving means, and nail holders oscillatable between nail-receiving and nail-driving positions. The bottom, side, and end members of the drawers, shown respectively in chain lines at 1, 2. 3 and 4, 5, are positioned about a block 6 on the main frame 8. The top 1 is held down by a clamp 7 suspended from a counterweighted hand-lever 13. The side 2 is positioned by a fixed bracket 9 and the side 3 by a clamp 10 connected to one arm 18 of a lever of which the other counterweighted end 20 carries a roll 22 engaging a cam 23 on a cam-shaft 24. The bracket 9 and clamp 10 are each recessed to receive spring-pressed levers 31, 32 having lugs 37 engaging the ends of the side members 2, 3 and spring plungers 39 within the block 6 which engage the interior of the sides. The end 4 is positioned by a bracket 11 and the end 5 by a clamp 12 integral with one arm 25 of a lever of which the other end carries a roll 29 engaging a cam 30 on the shaft 24. The shaft 24 is geared to an axially-movable shaft 43 on which is loosely mounted on a driven pulley 40. The pulley carries one clutch member 44 engageable with a clutch member 45 on the shaft 43, and the latter is moved axially, to clutch the pulley to it, by a treadle 46 operating through links 48, 49 and a lever 50. The links 48, 49 are connected by a trigger device 53, 54, and the member 54 is raised at the end of each revolution of the cam shaft to allow a spring 55 to move the shaft 43 in the declutching direction. To effect this movement, the hook 54 is connected to one arm 59 of a three-armed lever, another arm 57 of which carries a roll in engagement with a face cam 61 on the shaft 24. The third arm 60 carries a pin 97 in engagement with a plunger 98 connected to a lever 99 carrying a roll 100 in engagement with a cam on the shaft 24 and also carrying strikers 102, 103 adapted to engage stops 94, 96 on the clamp-operating arms 18, 25. If the clamps are obstructed in their closing movement on the work by an improperly placed' drawer part, the engagement of the stops 94, 36 and strikers 102, 103 oscillates the lever 99 and so raises the hook 54, thus declutching the pulley 40. The nails are fed from hoppers, not shown, by tubes 90 to nail chucks 91 and ejected into nail holders comprising pairs of spring fingers 65 mounted on members 64. The latter are mounted on rock shafts 63 which are oscillated', to move the nail holders into position in front of horizontal drivers 79, by means of intermeshing sector gears 69, 70, of which the gear 69 is linked to one arm 73 of a lever the other arm of which carries a roll 76 in engagement with a cam 78 on the shaft 24. The drivers 79 are mounted on carriers 80 reciprocable by levers 84 linked to cranks 86 on shafts 87 geared to the shaft 24. In operation, the drawer parts are placed in position, the clamp 7 is lowered and the clutch treadle depressed. The clamp 12 is advanced by the cam 30 and then the clamp 10 by the cam 23. Nails are supplied to the holders, which are then oscillated by the cam 78 when the nails are driven. The hook 54 is then raised by the cam 61 to declutch the pulley 40.