Patent GB-191123031-A (GB)
Title: Improvements in or relating to Heel-attaching or Heel-nailing Machines used in the Manufacture of Boots and shoes.
IPC: A43D79/00
Filed: 1911-10-18
Granted: 1912-10-17
Abstract: 23,031. Gouldbourn, J., and British United Shoe Machinery Co. Oct. 18. Heels, machines for.- A heel-attaching or heelnailing machine is provided with crank-operated mechanism comprising a toggle and a lost-motion connexion for first clamping the work and then continuing the pressure while the nails are driven by means other than the crank - operated mechanism. The invention is described as applied to a heel-attaching machine in which the work is engaged between a member C carried by a plunger C<1>, Fig. 1, and an opposed shoe - supporting member B constructed so that nails can be driven through it into the work. The plunger C<1> is actuated to clamp the heel against the shoe by connexions with a treadle lever E, which is centred at E* on a clutch lever E<1> pivoted at E<2> to the machine frame. These connexions comprise a lever F pinned to a fulcrum stud F*, and a lever G loosely mounted on this stud and coupled to the treadle lever through links H<1>, H<2>, H<3>, and H<4>; the lever G is connected by an adjusting-device to an arm secured to the stud F* for the purpose of initially adjusting the downward movement of the plunger to suit the work. The rear end of the lever F is provided with a ratchet segment F<6> adapted to be engaged by spring- pressed pawls J<1>, J<2> carried by a pressure lever J, which is also centred loosely on the stud F*; when this lever is lowered, the pawls are disengaged by tripping-devices adjustably secured to a slider J<3>, which engages an abutment A<2> on the machine frame ; but when the lever is raised, the pawls engage the segment F<6>, and the movement of the lever is communicated to the plunger-actuating lever F. The end of the lever J is connected by an adjustable yielding telescopic device comprising a rod K<2>, sliding cap K<3>, and a spring K<6> bearing on an abutment K<5>, with a toggle K, K<1>, which is operated through links L<1>, L, M from a crank pin N<1> on the main shaft N ; this shaft is driven through gearing N<2> from a driving-shaft D. The arrangement is such that, when the toggle is straightened, the lever J and its connexions move upwards as an entirety until the pawls J<1>, J<2> engage the segment F<6>, and afterwards the connexions telescope and a yielding pressure is imparted to the work. The shaft N carries a second crank-pin N<3> adapted to operate, through a link O and a toggle O<1>, O<2>, the nail drivers, which are constructed and arranged as usual in this type of machine. The treadle E is normally held raised by a spring E<3>, while a second spring E<4> connected to the clutch lever E' holds the centre E* also raised. When the treadle is depressed, it first turns about the centre E* to move, through the connexions described, the member C downwards, after which the levers E, E<1> move together about the centre E<2> to operate a single revolution clutch and start the machine. This clutch is normally held out of action by a member R controlled by a toggle, as long as the toggle remains straight ; but when the lever E' rises, a spring-pressed thrust finger R<3>, Fig. 8, acts on a trip-plate R' on an arm R<5> loosely mounted on a stud R<6>, and causes the end of the arm to bear against an abutment screw R<7> on the toggle, breaking the latter, and permitting the clutch to be thrown into operation. During the operation of the machine, a cam roll S' acts on a lever R<8> centred on the stud R<6>, causing it to bear against a projection R9 on the arm R<5>, to hold the end of this arm against the screw R<7> ; at the end of a single revolution, the cam turns the lever R<8> on its stud so that a screw R<10> on its free end presses against the finger R<3> and moves it away from the trip-plate R', when the toggle is immediately straightened and the machine stopped. The lever F is locked against movement during the driving of the nails by a series of co-operating friction plates Q<1>, Q<2>, Fig. 6, adapted to be clamped together between plates Q<4>, Q<5> by the straightening of an inverted toggle Q<10>, Q<12>, which is effected through a rod P<3> by a lever P, Fig. 1. This lever carries a roll P', which travels in a cam slot L<3> formed in an auxiliary arm L<2> of the lever L, the slot being arranged so that sufficient lost motion is provided to ensure that the locking - device will not be operated until the lever F has been moved to compress the work. The invention is also applicable to heel-attaching machines, in which the nails are driven from outside the boot through the heel and into the heel seat.