Patent GB-190821196-A (GB)
Title: Improvements in or relating to Lasting and like Machines.
Inventor: BOULT ALFRED JULIUS
Filed: 1908-10-07
Granted: 1909-11-08
Abstract: 21,196. Boult, A. J., [United Shoe Machinery Co.]. Oct. 7. Lasting.-In a "hand method" lasting-machine, means are provided to rotate the grippers about an axis extending in the general direction of the overdraw movement. This motion may be combined with a rotation about an axis extending in the general direction of the updraw movement. The invention is described as applied to a lasting machine of the kind described in Specification No. 14,453, A.D. 1897. As shown in Fig. 1, the usual pincer-carrying sleeve supports a bracket 6 with a pincer-carrier 8. The shank 10 of the gripper-jaws is journaled in the pincercarrier, which extends in the general direction uf the overdraw movement. The pincers are moved bodily in the updraw direction by the usual lever 28; in the overdraw direction by the combined action of the lever 28 and thrust-bar 54 ; and transversely of the last, to lay the plait, by means described in the above-mentioned Specification. The rotation of the jaws about the overdraw axis is effected by toothed segments 48, 46 operated through connexions from a slide 22 moving in a guideway in the lever 28. This slide is controlled by a connexion from a lever, which is operated by the means described in the prior Specification, for effecting the transverse movement of the grippers. The rotation and displacement of the grippers thus take place simultaneously. The grippers are closed by a rod 20, which co-operates with an arc-shaped member on the upper pincer-jaw. 'As shown in Fig. 6, the gripper-carrying sleeve 4 has a pin and slot engagement with the thrust-bar 54, and is extended downwardly and forwardly to form a bearing for a rotatable block 13, fixed to one jaw of the grippers. The other jaw is connected to the block by parallel links, and has a shank which passes through the block 13 and is adapted to be forced rearwardly to close the gripper jaws by a lever 15, pivoted to the gripper-carrying sleeve and operated by the plunger 20 through a pin 17 engaging a crooked slot in the lever. The rotation of the jaws about the overdraw axis is effected by the rocker 9, which is operatively connected, through a bell-crank 29 pivoted on the sleeve guide 41, to a crank-arm on the block 13. The rotation of the grippers about the updraw axis may be effected by a rack-bar 31 connected to the upper end of a lever 52, which is also operated by the rocker 9. The lever 52 has a slidab'e fulcrum-block 53. To avoid disturbing any plait in forming the succeeding one, the pivot block 53 is adjusted so that the resultant motion of the gripper-jaws is such that the rear-side edge, i.e. that adjacent to the previous plait, remains substantially in the vertical plane coincident with this edge during the movement. Another method consists in arranging the rear-side edge of the gripper-jaws, which are preferably tapered in all cases, in the axis of rotation, as shown in Fig. 9. This arrangement is only applicable for forming plaits in one direction, and when it is used the rotation of the grippers about the updraw axis may be dispensed with.