Patent GB-191027789-A (GB)
Title: Improvements in or relating to Machines Provided with Means for Performing Successive Operations Round the Marginal Portion of the Bottoms of Boots and Shoes.
Inventor: BOULT ALFRED JULIUS
IPC: A43D21/12
Filed: 1910-11-29
Granted: 1912-02-29
Abstract: 27,789. Boult. A. J., [United Shoe Machinery Co.]. Nov. 29. Loose-nailing.-A machine for lasting or tacking shoes comprises essentially a mechanism for moving the lasting or tacking means along the shoe edge, and means for moving the shoe-support in timed relation with this mechanism. The machine described is fitted with two last-supports each having a base b, Fig. 2, rotatably mounted in a carrier B, which can rotate about a shaft a<1> at the head of a column a. Each last - support comprises adjustable heel and toe rests b<2>, b<5>, Fig. 5, pivoted heel and toe clasps c<3>, c<8> operated simultaneously by a bail c<10>, and a series of jointed, flexible clamping-plates d, d<1>, d<2>, which constitute a guide or a track for a feeler to be described. These plates are pivotally supported on the upper ends of levers d3, d<4> rising from horizontal shafts d<5>, and are closed on to the last by springs d<10> and opened again by toggle levers d<11> actuated by a lever d<12>, which also releases the locking- device of the bail c<10> to allow springs to throw the heel and toe clasps away from the last. A shoe is placed on the last-support at the right hand of the machine, Fig. 2, and lasting-devices carried by plates f<5>, Fig. 3, at the ends of pivoted rods f<3> are then swung inwards and automatically locked by pawls f<18> and a ratchet f<20>. The lasting-devices comprise hand-operated wiper-plates of ordinary construction, adjustable for spring and pitch of the last; when they have worked the upper over the last, they are forced down on to the last by depressing the rods f<3>, by means of treadles f. After lasting, the rods f<3> are swung outwards again, and the last support with the shoe held by the toe and heel clasps c<3>, c<8>, and the clamping-plates d, d<1>, d<2>, is moved by the rotation of the carrier B into the position at the left, Fig. 2, for the purpose of being tacked &c. At the same time, the shoe that has just been tacked is swung by the carrier B, into the position at the right, Fig. 2, and is removed from its support, and a new one assembled in its place. In the lefthand position, Fig. 2, the shoe is acted upon by a tacker comprising an inclined tackercasing h<5> carried by a head h<4>, which is mounted to slide in guides at the upper end of an oscillating-standard h<2>. This standard is pivoted on a shaft h<1>, which is carried by the free ends of links fulcrumed on the main shaft h. The tacking-mechanism comprises hoppers i, i<1>, Fig. 1, containing tacks of different lengths, which are lifted by hook-shaped raceways mounted on a shaft i<2>, Fig. 2, and delivered into stationary raceways i<7>, and from these into the tacker tube, which is furnished with a wide nose h<6> to serve as a wiper. The shaft i<2> is driven by spur gearing, including a " Geneva " stop to provide a short dwell when the rotating and stationary raceways are in alinement, from a cam shaft h<14>, which also lifts a lever h<9> against the action of a spring h<11> to raise the driver - arm. The shaft h<14> is driven by a sprocket-wheel, through which, however, it is adapted to slide, and by a sprocket chain from the shaft h<1>, which is geared to the main clutch shaft h. The supply of tacks to the tacker tube is governed by a slotted gate m, Fig. 1, connected to a lever m<3>, which is successively controlled by cams mounted respectively on shafts i<13>, i<10>, Fig. 2, to determine whether long or short tacks shall be delivered to the tacker tube. The length of time these tacks are respectively delivered is controlled by a lever m<11>, Fig. 1, which shifts the free end of the gate-controlling lever m<3> from engagement with the cam on the shaft i<13> into engagement with the cam on the shaft i<10>. The lever m is raised and lowered by a cam-groove in a ratchet-wheel m<15>, Fig. 2, which is rotated intermittently by a spring pawl m<16> actuated through connexions by a cam on the shaft i<10>. The distance at which tacks are driven from the edge of the last is determined by a gauge or feeler n<1>, Fig. 2, which consists of a bell-crank which is adapted to ride on or to act against the clamping-plates d, d<1>, d<2>. This feeler is acted upon by springs n<4>, n<6>, and is adapted to be arrested by an adjustable stop n<7> secured to the head h<4>. To ensure proper driving of the tacks, the tacking-mechanism is given an in-and-out movement with relation to the edge of the last, and an upward movement to free the tacker from the material on the last. The standard h<2> is normally held to the right, Fig. 2, by a cord o and weight o<2>, but is moved to the left by a pivoted rod o<11> actuated by a clutch piece o<7> and a lever o<4> from a cam o<3> on the shaft h. This outward movement is substantially at a uniform distance away from the last. To prevent the tacker from kicking back, the rod o<11> is furnished with teeth adapted to be engaged by a locking-pawl o<14>, which is automatically tripped when the clutch o<7> is again actuated. The upward movement of the tacker is effected by a second cam p, Fig. 18, on the shaft h acting through links p<1>, p<3> and a clutch member p' on a rod p<7> carried by the shaft h<1>. The arrangement of. the two cams is such that the tacker is substantially simultaneously lifted and drawn away from the edge of the last, then let down, and finally drawn inwards again by the weight o<2>. If desired, the cams may be arranged so that, in its downward movement, the tacker delivers a blow on the upper near the edge of the shoe. In addition to its regular upward movement, the tacker receives an additional upward movement at the end of the tacking operation to raise it clear of the shoe. The relative movement of the last and tacker to drive tacks all round the shoe is provided partly by a travelling movement of the tacker, partly by swinging the last in front of the tacker, and partly by a combination of these movements. The travelling movement of the tacker is effected by moving the tacker head h<4>, Fig. 2, in its grooves at the upper end of the oscillating standard h<2> by means of a vertically-movable rack block s slidably hung on a rod s<3>, Fig. 24, carried by links s<4> projecting from a shaft s<5>. This block is provided with two sets of ratchet teeth adapted to be engaged, respectively, by spring-pressed pawls s<7>, s<8> carried by levers s<9>, s<10>, which are actuated to effect the feed movement of the pawls by cam slots s<13> in a plate s<14> mounted on a rod s<15>; this rod is vertically-reciprocated by a cam on the shaft h<1>. One of the pawls s<7>, s<8> is operative at a time to effect either the forward or return movement of the tacker head; but during either movement, the time in which the particular pawl is operative is controlled, to vary the feed, by shaped supporting-levers s<19>, s<20>, which are adapted to engage the tails of the pawls. The positions of these levers are controlled respectively by cams s<23>, s<24>, mounted on a shaft s<25>, which is intermittently rotated by a pawl s<27> and ratchet-wheel s<28> operated by the engagement of a pin s<30> on the reciprocating plate s<14> with the bevelled end s<29> of the pawlcarrying lever s<20>. The tacker travelling-mechanism is automatically adjusted according to the size of the shoe by vertically moving the rack block s. This is effected through the links connexions x<11>, x<10>, x<9>, x<6>, Fig. 2, by an inclined toe-piece x<5> connected to the adjustable toe-clasp c<8>; the toe-piece engages the lever x<6> to effect this adjustment as the shoe is moved into tacking position. The movement of the shoe to co-operate with the travelling movement of the tacker is effected partly by a forward rotation of the support, by means of the engagement of a spur-wheel t<4> on a stud b<1> depending from the turntable b with a mutilated gear t<5> on a shaft t<6>, and partly, when the gear-wheel t<5> is inoperative, by the forward or backward rotation of the support by means of the engagement of oppositely rotating pin-wheels t<18>, t<23> with a pin-wheel t<2> on the stud b<1>. The wheels t<18>, t<23> are driven through a train of gearing from a wheel t<13> on the shaft t<6>, which is intermittently rotated by a pawl t<9> and ratchet-wheel t<8> actuated from an eccentric on the main shaft h. As a result of the co-operation of the travelling tacker with the rotating shoe-support, tacks are inserted all round the shoe edge, as shown in Fig. 23<a>. As soon as the tacking is completed, a dog on the upper side of the ratchet-wheel t<8> trips the controlling-mechanism of the main driving clutch and stops the rotation of the main shaft h, and thereby all movement of the tacker and of the mechanism for rotating the shoe. The operator then manually rotates the carrier B to bring the tacked shoe into position to the right, Fig. 2, ready for removal from the machine, and at the same time a newlyjacked shoe is carried into tacking position. As the carrier nears the end of this movement, a lug u<13> on the under side of the gear-wheel t<4> actuates the clutch-controlling mechanism, causing the main clutch again to be thrown into gear to start the main shaft h. When the tacked shoe moves away from the tacking position, the upper is still clamped by the clamping- members d, d<1>, d<2> and the heel and toe clasps c<3>, c<8>, which during the movement of the support into, and while it is in, tacking position have been held operative by the engagement of a roller on a lever d<14>, Figs. 1 and 2, connected to the actuating lever d<12>, with the concentric portion of a cam w. As the shoe approaches the front of the machine, into a position ready for removal, the roller on the lever d<14> travels upon an eccentric portion of the cam w, causing the lever d<12> to be moved to release the clamps and the heel and toe clasps. When the shoe reaches the front of the machine, the carrier B is automatically locked by a spr