Patent GB-190700092-A (GB)
Title: Improvements in and connected with Machines for Trimming or Rounding the Soles of Boots or Shoes.
Inventor: JUSTICE PHILIP MIDDLETON
Filed: 1907-01-01
Granted: 1908-02-01
Abstract: 92. Justice, P. M., [Manufacturers' Machine Co.]. Jan. 1. Paring; channelling; soles.-Relates to a combined rough-rounding and channelling machine, and consists, mainly, in the provision of an indicating- means by which the operator can determine and control the relation between the rate at which the work is fed and the operation of the means for varying the relative positions of the trimming- knife and work-guide, so that, in working on boots with " Scotch " or " Baltimore " edges, the widened extension of the sole will always occur at the proper place; further, in the provision of means for adj usting the above device so that it can be used without any substitution of patterns or parts on different-sized boots ; further, in the provision of means for slowing-up the machine when working on parts of the shoe showing abrupt curves; and, lastly, in the provision of means for controlling the channelling-knife so as to vary the distance of the channel from the edge of the sole. The edge of the sole is inserted between a guide 3, Figs. 3 and 13, and a spring presser-foot 4, while the sole bottom is supported on a rest 5, and the sole is trimmed by a knife 6, Fig. 13, mounted in a carrier 7. A reciprocating motion, positive in both directions, is given to the knife by means of a frog cam 8. 8<a>, on the main shaft 9, acting respectively on rollers 15, 16 carried by a pivoted, swinging lever 10, which is slotted to receive a two-part sliding block 19 carried by a stud 18 secured to the carrier 7. Provision is made for taking up wear between the rollers and the cam, and between the block 19 and its slot, so that no lost motion occurs. The feed of the work is effected by the combined action of the guide 3, presser 4, and knife 6. When the shoe is inserted, the presser moves forward to clamp the sole against the guide 3, and then the knife moves forward to cut partly into the work. The guide, presser, knife, and work then move laterally to effect the feed, during which movement the knife completes its cutting action ; the presser is next eased, and the presser and guide return to their initial position. The presser then grips the sole again, and the knife is withdrawn. These lateral movements are provided for by making the holder 17, in which the carrier 7 slides, capable of lateral movement, and by mounting both the guide and presser on an arm 24, Fig. 13, mounted for lateral movement on a stud 25. The holder 17 and arm 24 are actuated by inclined members in such a way that there is no jar or pounding action. Pivoted to the arm 24 is an actuator 60, Figs. 3 and 15, the centre of which is connected by a link 61 to a lever 62 actuated by a cam 65 on the shaft 9. The free end of the actuator carries a pivoted block 67, which slides in a groove 68 in a member 66. A similar arrangement, actuated from the member 66, is provided for moving the holder 17 laterally. The member 66 is pivotally mounted in arms 80, 81, and means are provided for adjusting it so as to vary the extent of movement of the arm and holder, and hence the feed. A double pinion meshing with teeth 83, Fig. 15, on the holler 17, and a pia 401, ensure that the holder is moved in right lines. The presser 4 is mounted to move automatically, and also so that it can be moved back out of the way when desired. It is mounted on a lever 26, Fig. 3, which carries a stud 27 pivoted to the arm 24. A light spring 48, Fig. 8, holds the presser 4 against the sole during the return movements of the presser and guide ; during the cutting action, the presser is pressed firmly against the sole by a mechanism which is preferably made adjustable to suit different grades of leather. This mechanism consists of a pivoted, cam actuated lever 30, Fig. 8, depending from a plate 28, and provided with an eccentric stud 33, which rests in a gripping-jaw 34. A co-operating jaw 35 receives a pin 37 fixed in the plate 28. Between these jaws, there passes a rod 39, which has a forward swivelled end 41 pivoted to a swinging member 42. A bolt 45 passes through an arm 44 extending from this member, and engages an arm 46 rigid with the lever 26. A cushion spring 47 is placed between the arm 44 and the head of the bolt. At the proper time in the cutting action, the jaws 34, 35 grip the rod 34, and thrust it forward to actuate, through the member 42, the lever 26, and hence the presser. To vary the extent of forward movement of the presser, there is provided a spring stop 51, which coacts with the plate 28. The backward movement of the plate is limited by an adjustable stop 52, which has a ball- and-socket connexion with a member 54. The latter is forked to engage a stud 57 on the plate 28, and a spring 55 is provided which tends to hold the upper arm of the fork against the stud. This construction prevents noise or jar between the plate 28 and the stop. A somewhat similar silent stop mechanism is placed between the member 42 and the lever 26. To provide for soles of different width, and for greater or less extension at different parts of any one sole, the knife 6 is mounted so that it can be moved towards or away from the guide 3, its position being automatically determined by a pattern mechanism. The knife is mounted in a frame 250, Fig. 52, from which extends an arm 90 provided with a cam-block 91, which coacts with a wedge 92. Pivoted to the latter is a block 96, which slides in a guideway 97 pivoted in a two-part block 98, the jaws of which are formed or mounted respectively on camactuated levers 101, 105. These levers cause the jaws to open and close, and also give to them a bodily swinging movement. The block 98 has a shank 108, against which bears a spring-pressed lever 109, which is controlled by a rotating pattern 114, Fig. 4. This pattern thus determines the position of the wedge 92, which in turn controls the position of the knife. The rotation of the pattern is started manually, but is stopped automatically, and the rate of rotation can be varied as required. The pattern-shaft 115, Fig. 4, is driven by worm gearing 120,121 from a countershaft 122, which is driven from a vertical shaft 123 having a spiral gear meshing with a gear on the main shaft 9. A double pattern is used, one half being for a right shoe and the otler for a left. The pattern rotates for half a revolution, and then stops automatically ; then it is started again manually in the same direction, and is again stopped automatically. To effect this intermittent movement, a friction device 130, 131 is placed between the shafts 122, 123, and a sliding actuator 133 is provided. The latter is engaged by two members 134, one of which engages the bearing-block of the shaft 123, while the other engages a resistance block 138. The actuator is acted upon by a lever 139, which is provided with an arm 142 arranged in the path of studs projecting from the gear 120. These, at the proper time, engage the arm 142, and cause the actuator, which with the members 134 forms a toggle, to move to the right to break the toggle and so allow the shaft 123 to fall, uncoupling the friction device 130,131, and throwing the pattern out of operation. A swinging arm 150 coupled up to a treadle enables the actuator to be manually shifted, to couple up the shafts 122, 123 again. The feeding-means are made adjustable, to ensure that the extension at the ball of the slice is correctly placed on different sizes of shoes, and the rate of feed can be varied to suit the curvature of different parts of the sole. Further, the speed of rotation of the pattern may be varied, if it is desired to work on different sizes of shoes with the same rate of feed. For these purposes, the member 66, Fig. 31, is provided with trunnions journaled in bearings 80, 81, Fig. 3. The upper trunnion has mounted on it the hub of a lever 161, which is pivoted to a handlever 163. One end of this lever is pivotally secured to the shaft 122, and the other end is provided with a catch 165 adapted to engage notches 166 in a quadrant 167 rigid with the hub of the lever 161. So long as the hub is loose on the trunnion, the feed is not affected; but, by tightening a clamping-screw, the arm 161 inclines the member 66, and thus varies the rate of feed. The quadrant 167 is preferably marked to indicate different sizes of shoes. When it is desired to vary the pattern speed and keep the feed constant, the hub is loose on the trunnion, and any movement of the levers 161, 163 merely shifts the position of the friction disk 130 ; but, when it is desired to vary both the pattern speed and the feed, as when rounding a sharp curve, the hub is clamped on the trunnion, and the hand-lever 163 is shifted as is necessary. Cam-operated means may be thrown into operation, when desired, to vary the rate of feed automatically. The channel. ling-knife 200, Figs. 4 and 13, is yieldingly held in a holder 201, which is hung at its rear end from the holder 17, and at its front end is carried by a block 204 on one arm 203 of a T-lever, the side arms 207, 208 of which are provided with screw stops, to limit the rocking movement of the lever. The arm 208 is connected by a link 211 to a link 212, which is adapted to be engaged by a cam ledge on the lever 150. When the latter is fully lowered, it raises the channelling-knife against the action of a spring 220, the shifting of the lever 150 being under the control of the operator. The pattern, or an indicating-disk separate therefrom but mounted on the shatt 115, may be marked to indicate different parts of the shoe, so that the operator can readily see how the work is, or should be, progressing, and hence be enabled to regulate the feed, the speed of the pattern, or the position of the channelling-knife accordingly. The knife 6 cuts against a chopping-block 21, Fig. 13, clamped in the back face of the guide 3, which is mounted for vertical adjustment in the arm 24. To enable the channelling-knife to be moved back when fresh work is to be insert