Patent GB-892853-A (GB)
Title: Improvements in or relating to belt-fastening machines
Inventor: POTTER JOHN JAMES
IPC: F16G3/00
Filed: 1959-06-24
Abstract: 892,853. Belt-fastening appliances. HAYDEN-NILOS Ltd. June 22, 1960 [June 24, 1959], No. 21605/59. Classes 80 (1) and 80 (3). In a machine for inserting wire hook fasteners 15, Fig. 5, from a comb bar 13 into the end of a belt 16 held by a clamp bar 36, a jaw unit 10, Fig. 2, is traversed along guide-bars 8, 9 by pawl- and-ratchet mechanism actuated by a face cam 62 on a sleeve 25 movable with the unit 10 and slidably keyed to a power-driven shaft 28. The shaft 28 extends across the machine and itself has circumferential grooves to provide ratchet teeth for the pawl mechanism, the sleeve 25 also carrying an eccentric 24, Fig. 5, which actuates the jaws 18, 19 through toggle links 20 after each traversing movement. The face cam 62 engages a projection 61 on a lever 59 pivoted at 60 and loaded by a spring 66. A pawl 58, Fig. 6, mounted for vertical movement in a housing on the lever 59 is urged by a spring 68 to engage the circumferential teeth on the shaft 28. Each time the jaws are fully opened by the eccentric 24 the cam 62 pushes against the lever 59 to move the jaw unit along the shaft 28, the spring 66 subsequently acting to shift the pawl 58 to the next tooth. When the jaw unit reaches the end of the shaft 28, or at any other desired time, the pawl 58 may be manually retracted and the unit moved by hand back to its initial position. The pawl is held retracted by twisting its hand knob 69, which has a bar-and-slot connection with the pawl housing. The machine also includes a power-driven trimming knife. An arm 72 slidable along the bars 8, 9 and lockable thereto facilitates aligning the belt before clamping and trimming. Alternatively a belt aligning plate 75 may be carried by the jaw unit. The clamping bar 36 is actuated by mechanism 38, Fig. 5, as in Specification 833,063, and holds the belt against an angle section bar 35. The trimming knife 39 which cuts in either direction of movement is traversed by a screw 41 extending across the machine and housed in a channel carried by the bar 35. The screw 41 is driven through a belt- and-pulley 43 from a dog-clutch member 45. Actuation of a clutch lever 34 causes the drive from a gear-box 4 to be coupled either to the screw 41 or to the shaft 28. As shown the machine is mounted on a bench and the gear-box 4 is driven by a reversible electric motor mounted below the bench. The clutch lever 34 coacts with micro-switches such as 53, 55 so that when the screw 41 is being driven the motor is controlled by forward and reverse buttons 46, 47 while when the shaft 28 is being driven the motor is controlled by start and stop buttons 51, 52. Limit switches adjacent the ends of the screw 41 de-energize the motor at the end of a traverse of the trimming knife. The jaw unit 10 has a casing the lower part of which may comprise an oil bath for the eccentric 24. The gear-box 4 may be oriented with its input shaft in different positions so that it may alternatively be coupled to the electric motor provided or be coupled to an external power device such as a pneumatic drill. In one modification the gear-box 4 is directly coupled to the shaft 28 by an adaptor, and has its input shaft horizontal, for detachable connection to an external power device. The shaft 41 may then be driven, also by an external device, through a slipping clutch and bevel reversing gear. In a further modification the machine is mounted on angle irons, rather than a bench, for use underground and has the gear-box input shaft and the screw drive shaft extending either horizontally or vertically upwards and carrying adaptors to receive an external power device. In a modification dispersing with the gear-box and with the bevel reversing gear the shaft 28 has an adaptor for direct coupling to a power device and the two ends of the screw 41 may be selectively driven through a slipping clutch and adaptor by the same power device to effect traverse of the trimming knife in one or other direction.