Patent GB-191320503-A (GB)
Title: Improvements in or relating to Machines for Inserting Fasteners.
Inventor: WADE HAROLD
IPC: A43D69/02
Filed: 1913-09-10
Granted: 1914-09-10
Abstract: 20,503. Wade, H., [United Shoe Machinery Co.]. Sept. 10. Loose-nailing.-A machine of the type described in Specification 25,951/05 for inserting fasteners, in which one or other of two raceways supplying fasteners to the driver is automatically moved into the operative position in accordance w i t h the thickness of the work, is provided with means which tend to hold the same raceway always in the operative position and is also so arranged that a raceway other than that determined by the thickness of the work may be manually brought into the operative position. The raceways in the machine shown are moved as described in Specification 8555/10 by the engagement of one or other of the projections on a double pawl 502 with shoulders on a. slide 304. the double pawl being mounted in a vertical slide 280 reciprocated by connexion with a cam-operated bell-crauh lever 298. The pawl 502 is pivoted in a member 600 projecting from the slide 280 and is provided with a semicircular boss having shoulders which co-operate with dogs 536, 538 upon the pawl-tipper 606. The tipper comprises two arms 608, 610 carrying the dogs and a circular body-portion provided with a hub 612, Fig. 7, which turns freely upon a shaft 614. The body-portion of the tipper is cut away below the hub to form a segmental opening 616 through which projects a stop 618. Fig. 6, carried by an arm 620, Fig. 4, provided with a hub sleeved upon the hub 612. A spring 622 clamped at one end to the hub 612 forces the arm 620 against a stop 628, which can be adjusted by hand about the circular portion of the pawl-tipper. The pawl-tipper is normally held in short-nail position by a spring 636 which depresses a lever 642 provided with a rack 646, which engages teeth on the pawl-tipper, the movement of the lever 642 being limited by a stop. The movement of the tipper to bring the long-nail raceway automatically into the operative position is effected by a lever 652, Fig. 6, which is connected by a rod with a pawl-carrying slide adjusted by a work-clamping device as described in Specification 12,262/10. The swinging movement of the lever is transmitted through multiplying-gear to the shaft 614 which is turned to a degree dependent upon the thickness of the work. The rotation of the shaft carries a dog 670 mounted on the shaft into contact with the stop 618 on the arm 620 and, if the movement of the shaft is sufficient, presses the arm 620 backwards, the arm 620 also moving the pawl-tipper through the spring 622 to the long-nail position against the pressure of the spring 636. By adjusting the position of the stop 628 and also the normal position of the arm 620, the point at which the tipper begins to move towards the long-nail position can be varied and thus the machine can be arranged to deliver long nails when the thickness of the work is such that the amount of clinch which would be given to a short nail falls below a predetermined limit. The pawl tip is graduated and the stop 628 can be set to effect the change of the raceways at any desired thickness of the work. To enable a long nail to be supplied, though the thickness of the work is insufficient to move the raceway across automatically, the lever 642, Fig. 4, has an arm 676 engaged by one arm 682 of a bell-crank lever, the other arm 690 of which is formed with a bore through which slides a rod 692 connected to a treadle 706, Fig. 11. The rod 692 passes through a sleeve 694 projecting from a sleeve 697 sliding on the starting-treadle rod 260. By forcing down the treadle 706, the lever 642 is first moved to bring the long-nail raceway into the operative position, and on further depression, the sleeve 697 is brought down against a stop on the starting-treadle rod 260, thus causing the machine to start without raising the horn.