Patent GB-463653-A (GB)
Title: Improvements in or relating to heel shaping machines
IPC: B27M3/20
Filed: 1935-10-04
Abstract: 463,653. Heel-shaping machines. BRITISH UNITED SHOE MACHINERY CO., Ltd. (United Shoe Machinery Corporation) Oct. 4, 1935, No. 27381. [Class 145 (i)] Comprises detail improvements in heelshaping machines of the type in which heel blanks are presented to a rotating cutter while held in a manually-movable jack, the movement of which is controlled by means adjustable to vary the size and style of heel, and particularly to those in which each of a pair of cutters 16 on vertical shafts trims one side of the heel from the breast edge to the centre of the back, such as the machine described in Specification 225,291, [Class 145 (i)]. The blank 35 is gripped between the lower fixed jaw 30 and upper jaw 32 of the jack, the jaw 32 being operable by a handle 34, and the jack is pivoted at 28 to a head 26 carried by a rotatably and vertically movable jack-shaft 24 carried by a pivoted bracket 22. As the jack is rotated with its shaft 24 an arm 36 extending from the lower end of the shaft rides on a lower cam track 38, so causing the jack to rise and fall ; at the same time the part 39 of the jack rides on an upper cam track 40, causing the jack to tilt to varying degrees about the pivot 28. The combination of the vertical and tilting movements as the heel is rotated, together with the curved cutting edge of the cutters gives the required form to the heel. The depth of cut is determined by a form 46 mounted on the jackshaft 24 and engaging a collar 48 adjustably mounted in front of the cutter shaft. Both the cam tracks 38, 40 are vertically adjustable and the upper track is also adjustable in inclination about pivots 42, to vary the shape or size of the heel. In order that vertical adjustment of the jack may be made without altering the tilt, one feature of the invention consists in providing means for simultaneous vertical adjustment of the two tracks by a single carrying device. In the form shown, the lower track is carried by slotted verticallyadjustable brackets 50 carrying ears 54 bearing screws 56 on which rest slotted brackets 44 carrying the upper track. Both tracks may therefore be simultaneously vertically adjusted by loosening the bolts passing through the slotted brackets and adjusting the screws 62. The distance between the tracks may be varied by adjusting the screws 56. Scales 66, 68 are provided showing respectively the simultaneous movement of the tracks and the movement of the upper track relatively to the lower. The form 46, Fig. 7, controlling the depth of cut is of U- shape so that it may be changed by sliding it laterally over the jack-shaft 24 without disassembly of the jack; it is clamped to the head 26 by a plate 108 with an integral block 110 fitting between the arms. The jaws of the jack are formed with flat lands 98 which limit the pentration of the teeth 100 into the wood blank. The movable side gauge 102 carried by a swinging arm 104 operated by the jack handle, as described in Specification 332,295, [Class 145 (i)], carries a projection 106 which, when the jack is opened, is caused by the movement of the arm 104 to engage the under face of the heel, and free it from the lower jaw. The jack is provided with interchangeable sets of breast gauges adapted to position different types of blanks at positions near the attaching faces and the top lift ends, the parts composing each set being interconnected so that they may be adjusted as a whole on the jack. The gauge shown comprises a slotted channelled member 78 riding on a rib 80 on the jack frame, a lower slotted gauge member 84 resting on it, and an upper slotted gauge member 86, all clamped in adjusted position by a screw 82, and caused to move together by dowel pins extending from the member 86 down through holes in the members 78, 84. The front edge of the member 84 contacts with the breast lip of the heel, and a screw 88 in the member 86 contacts with the breast near the top-lift end.