Patent GB-1105612-A (GB)
Title: Improvements in or relating to machines suitable for use in operating on marginal portions of shoe bottoms
Inventor: KESTELL THOMAS AUBREY
IPC: A43D37/00
Filed: 1963-10-15
Abstract: 1,105,612. Boots &c. BRITISH UNITED SHOE MACHINERY CO. Ltd. 14 Oct., 1964 [15 Oct., 1963], No. 40529/63. Heading A3B. A machine suitable for use in operating on marginal portions of shoe bottoms e.g. a roughing machine, comprises work supporting means for supporting a pair of shoes, tool supporting means for supporting two tools and means for causing relative movement between the work supporting means and the tool supporting means such that the tools operate progressively along the marginal portions of the shoe bottoms, one tool operating on each of the shoes. As described the machine is a shoe bottom roughing machine (Fig. 1) which has two work supports 40 and two roughing tools 44, one set on each side of a central partition 32, for roughing a pair of shoes. The roughing tools 44 are mounted on a common support which moves lengthwise of the shoe, and the shoe supports are mounted for movement towards and away from each other, transversely of the shoe, the combined effect of these two movements being such that roughing tool operates progressively along the margin of the shoe bottom. The roughing tools 44, 46 (Figs. 5, 11) are carried by a housing 240 which is pivotally mounted on arms 248 which are carried in a member 264 pivoted to a shaft 276. An epitrochoidal crank mounted on the main drive and cam shaft 50 acts through a series of links to swing the arms 248 to move the roughing tools 44, 46 along a straight line, lengthwise of the machine, the epitrochoidal crank providing the roughing tools 44, 46 with a short dwell period at the toe and heel of the shoe. Levers 554 and 588 allow for adjustment of the speed and length of the movement. The housing 240 can be tilted under the control of a cam (not shown) so that only one side of the roughing tool engages the shoe bottom and roughs the shoe bottom with an inward wiping movement. The roughing tools 44, 46 are mounted for heightwise movement on the drive shafts 210, and include a chamber to which compressed air can be supplied to vary the effective weight of each roughing tool. The shoe supporting means 40 (Figs. 2, 17) is pivoted to the end of support arm 66 (Figs. 2, 8, 17) and can be tilted about the pivot by a link 132 under the control of a cam (not shown) so that the margin of the shoe is presented to the roughing tool at the correct angle. The support arm 66 is mounted on a shaft 72 and can be swung about the shaft 72 by an arm 180 under the control of a cam (not shown) on the main cam shaft 50 to provide the transverse movement of the shoe supports towards and away from each other. The shaft 72 (Fig. 8) is carried by arms 74 pivoted to a shaft 76 to allow for heightwise movement of the arm 66. The arm 66 is raised by a piston and cylinder P5 initially from a low loading position to an operative position where the shoe bottom contacts the roughing tool, and then under the control of a cam (not shown) to vary the heightwise position of the arm 66 according to the contour of the shoe bottom so that the portion of the shoe bottom being roughed is presented to the roughing tool at a constant height. The shoe support 40 (Figs. 16, 17) includes a toe rest 838 pivoted to a shaft 852, the heightwise position being determined by an adjustable stop 868 and a heel support 894 mounted on a shaft 890. A pair of waist clamping plates 910 are carried by the shoe support which mask the waist region of the shoe and against which the shoe is clamped by heightwise movement of the heel rest 894 and toe rest 838 under the action of piston and cylinder P1. A pair of toe clamps 950 are operated by piston and cylinder P32 and a pair of heel clamps are operated by piston and cylinder P31. The main cam and drive shaft 50 is driven by a variable speed hydraulic drive unit 430 (Fig. 5) powered by an electric motor (not shown). Mounted on the main shaft 50 is a drum 636 (Fig. 2) which carries five sets of cams A, B, C, D, E, each set comprising three cams for controlling the height of the shoe support, the tilt of the shoe support and the tilt of the roughing tool. Each set of cams corresponds to a particular size or style of shoe and can be brought into operative position adjacent cam followers 122, 170, 340 by rotating the drum 636, the drum being locked in position when the appropriate set of cams has been selected. The machine has a grinding tool 1034 (Figs. 1, 26) for sharpening the brushes of the roughing tools 44, 46. The head 214 carrying the roughing tool can be rotated through 180 degrees about the shaft 404 (Fig. 11) to bring the roughing tool into position. The grinding wheel 1034 is then moved from an upright position to the position shown in Fig. 26 to sharpen the tool. The machine includes an electric and a pneumatic control circuit and can be set to perform an all round roughing operation or a forepart roughing operation. In an all round roughing operation the operator places a shoe in the right hand shoe support and depresses a treadle 1130 to a first position to clamp the shoe and places a second shoe in the left hand shoe support and depresses the treadle 1130 to a second position to clamp the second shoe. The operator then presses a starting switch which initiates the relative movement between the shoe support and the roughing tool and raises the shoe support to its operative position, the roughing tool meeting the shoe bottom at the breast line at one side of the shoe. When the roughing tool has reached the starting point again the shoe support is lowered and the drive to the cam shaft 50 and hence the relative movement between the shoe support and roughing tool is reversed for a short period being brought to rest so that in the next operation the roughing tool will again meet the shoe at the breast line. The shoe support then releases the shoe, which drops into a receptacle and the machine stops. When the machine is set for forepart roughing the machine operates as above until the roughing tool reaches the breast line at the opposite side of the shoe when the shoe support is lowered. Relative movement between the shoe support and roughing tool continues, but at a greater speed until the roughing tool reaches its starting position when the machine stops as above.