Patent GB-231849-A (GB)
Title: An improved lasting machine
IPC: A43D21/16
Filed: 1925-03-18
Abstract: 231,849. Goodrich Co., B. F., (Assignees of Macdonald, F. J.). April 5, 1924, [Convention date]. Lasting and pulling-over.-In a lasting- machine of the kind in which gripper jaws cooperate with a last support to pull over the upper, the edge of the upper is drawn into and positioned within the gripper jaws by means having a retractive movement past the gripper jaws. In the machine described, a set of gripper units surround and define the lasting position, each unit comprising a stem 28, Fig. 10, vertically adjustable in a fixed frame 12 and slotted to engage a pivot 26 of an L-shaped carrier 30. 31 for the gripper jaws. One of these jaws 37 is formed on the member 30, and the other 38 pivoted thereto with an extension 39 having an upper surface 39<a> concentric with the pivot 26 when the jaws are closed. The upper positioning means comprise jaws 43, 44 pivoted together at 45, supported by a roll 40<a> on the pivot of the jaws 37, 38 and actuated by a member 48 having an upper surface 48<a> concentric with the pivot 26 when the jaws are closed. A member 52 is pivoted to the extension 39 and provided with a roll 54. This member is connected by a spring 57 with the extension 39 so that the spring tends to open the jaws 37, 38 and also to close the jaws 43, 44 when they are retracted but. open them when they are projected, by engagement with a hook 55 on the jaw 43. The gripper units are actuated by three frames 16, 17, 18 which are automatically moved vertically during the operation of the machine, the frame 16 being connected by a spring 33 and lost motion connection 32 with the arm 31 of each unit, and the frames 17, 18 carrying rollers 41, 51, which engage the surfaces 39<a>, 48a. The machine is driven by a clutch 136, Fig. 1, operated by a treadle 143 moving with an arm carrying a brake block 142 which engages a disc 135 on the driving shaft 69 when the clutch is disengaged. The shaft 69 carries at each end a pinion 70, Fig. 4, driving a drum 74 on which are gear segments operating pinions 119 each actuating an eccentric by which the frames 16, 17, 18 are raised and lowered as required. The brake block 142 is kept out of action, and therefore the clutch kept engaged, for one revolution of the drum 74, by a pawl 145, which is tripped at the end of the cycle by a stud 149. This pawl is provided with a treadle 146 in case it is desired to stop the machine at an intermediate point in the cycle. The pinions 119 are normally held stationary by latches 129, which are held out by cams when the corresponding gear segments are in mesh with the pinions. The shafts 76 of the gear drums are secured at their inner ends, to cranks 80, Fig. 8, provided with rollers 83 co-operating with an arm 84 which raises and lowers the last. This arm is formed with a portion 85 which is concentric with the shaft 76 when the last is in its raised position. The end of the arm is connected by an adjustable link 86 with a last carriage 14a, Fig. 1, guided by bars 14b sliding in a fixed cross bar 88. The last support 89 is interchangeable for different sizes of lasts, and is held in place by dowels 90. A jig 92 positions the last 13 on its support. This jig is pivoted on a shaft 93, Fig. 8, and is automatically removed from the path of the rising last support and returned to operative position as the last support descends by a pin 98 engaging a fork 97 on the jig. The gripper tilting frame 16 is adjusted vertically for different sizes of lasts by a handle 105, Fig. 4, normally clamped to arms 101 b on brackets 101 on the lower ends of the lifting bars of the frame. The handle 105 is connected by arms 103 to each bracket, the arms being pivoted at 102 to the bracket and at 108 to the link carried by the eccentric, so that raising the handle increases the effective length of the link and tilts the grippers inwardly to take a smaller upper. In operation, an upper, say of cloth and leather, for tennis shoes, is given a coat of cement at its edge and is positioned with its margin between the jaws 43, 44. A last with an insole thereon is placed on the last support 89 and positioned by the jig 92. The machine is then started by depressing the clutch treadle 143. The last then rises while the frame 17 is lowered to close the upper positioning jaws 43, 44 slightly on the upper, these jaws sliding outwardly on the upper to position the margin within the open jaws 37, 38. The frame 13 then descends, closing the jaws 37, 38, which grip the margin while the last is forced upwardly into the upper. The frame 16 is then raised to tilt the jaw carriers 30 inwardly, the jaws 37, 38 carrying the margin of the upper over the edge of the insole. The frames 17 and 18 then rise opening the jaws 37, 38 and allowing the closed jaws 43, 44 to press the margin against the insole while the operator holds the last down by hand. All parts then return to starting position, when the latch 145 is tripped by the stud 149, and the machine comes to rest and the lasted shoe may be removed.