Patent GB-228331-A (GB)
Title: Improvements in or relating to machines for attaching heels
IPC: A43D79/00
Filed: 1924-01-21
Abstract: 228,331. Gimson Shoe Machinery Co., Ltd., and Choice, F. C. Jan. 21, 1924. Heels, machines for.-In a heel attaching machine of the type wherein the heel is secured by fasteners driven from the inside of the shoe, the jack for supporting the work is movable to and from the attaching position to facilitate loading with nails, positioning and removal of the shoe, clamping means for holding the heel on the shoe! actuated by a treadle have locking means combined therewith, and devices are provided that prevent the heel being clamped unless the jack is in operative position, and prevent the machine being started unless the heel is clamped. The jack 1, Fig. 1, is slid by a handle 10 to and from its operative position,' its base being provided with a dovetail engaging a guideway 6. The jack is provided with nail guide tubes 2, Fig. 2, and drivers 3 operated by a plunger 4 resting on an adjustable plunger 11, 12 which may be raised by a handle 16 if it is desired to ascertain whether the requisite number of nails have been inserted in the jack. The plunger 12 rests on a plunger actuated by an eccentric on the main shaft. The heel clamp comprises a pad 69, Fig. 10, for engaging the top lift, which pad is adjustable angularly and also along a slide 75. and a pad 70 engaging the back of the heel. This pad is adjustable angularly on a stalk 79 itself adjustable vertically by a nut 80 and angularly by a thumb screw 83. The clamp is vertically adjustable in a cross beam 20, Fig. 1, mounted on vertically sliding rods 21 normally raised by springs 23. The lower ends of these rods are pivoted to a yoke 25 connected by links 27 to a treadle. To prevent the heel being clamped unless the jack is in operative position the lower end of one of the rods 21 is linked to a lever 41 actuating a spring pin 42 which is prevented rising by the base of the jack unless this is in proper position, when a hole in the base registers with the pin. The connections between the links 27 and the corresponding treadle comprise a rack 30, Fig. 6, co-operating with a pawl 32 which may be freed when desired by a knee lever. The clutch treadle is provided with an arm 49, which is prevented from movement by a slide bar 51 unless the rack 30 has descended clear of this bar, this mechanism preventing the machine being started unless the heel is clamped. Normally, depression of the clutch treadle swings the arm 49 from under a spring pressed dog 57 which then moves into the path of two members 55, Fig. 8, on a constantly running pulley 54. If the treadle is quickly released, the main shaft 15 will make one revolution, a roller 59 on the dog 57 riding along a block 60 at the end of the arm 49 to disengage the dog from the member 55. A shoulder is provided on the block 60 to stop the machine at a definite point. If the treadle is kept depressed, the shaft 15 will continue to rotate, and the nail drivers will be given a second thrust. As the machine comes to rest, the side of the roller 59 engages a spring plunger 64, Fig. 6, connected to a push rod 62 which frees the pawl 32 and unclamps the heel. For giving the clamp a slight further depression while the nails are being driven the rear end of the yoke 25, Fig. 2, is depressed by the rise of the nail-driving plunger 13. This plunger has a recess 67 normally in line with a roll 66 on a member pivoted to the machine, frame and connected to the yoke by links 37. The normal position of the rear end of the yoke is adjusted by a stop screw 38. The main shaft 15 may be provided with a band brake for preventing overrunning.