Patent GB-677852-A (GB)
Title: Improvements in or relating to the manufacture of shoes
IPC: D05B15/04
Filed: 1950-01-04
Abstract: 677,852. Making footwear; sewing-machines. BRITISH UNITED SHOE MACHINERY CO., Ltd., JAMES, C. H., RICKS, F., and SHEFFIELD, C. C. Jan. 3, 1951 [Jan. 4, 1950; Feb. 10, 1950], Nos. 173/50 and 3417/50. Classes 17 (i), 17 (ii) and 112. Making force-lasted footwear.-An upper U, Fig. 3, previously pulled over on a last by a machine such as described in Specifications 419,067 and 453,844, is lasted and stitched to a reinforced sock lining I in a lasting and stitching machine, a platform sole S, previously cemented to the lining I, being trimmed approximately on the line of the seam as the work is fed past the needle, so that the stitches are set against the lining I, the part X of the sole being removed. The upper and lining, and in the form shown a platform cover C which is also secured by the stitching, are subsequently bent down over the trimmed edge of the sole S and secured thereto; the edge of the sole may be trimmed slightly inside the line of the seam to allow space for the turned down parts. The trimming knife is prevented from damaging the sock lining I by a shield member 27. The sole S and the lining I may for convenience be cemented all over and an anti-adhesive coating, applied to their marginal portions to allow the entry of the shield member, these portions being subsequently recemented. Boot-sole stitching and lasting machines; trimming soles during lasting.-A machine such as described in Specifications 361,336 and 447,062, having lasting-grippers 3, Fig. 3, and a presser-foot 29, is provided with a shield member 27 entering between the sole S and the socklining I to prevent damage of the latter part by a sole-trimming knife; the machine is also provided with a platform-cover guide 19, and the shield 27 is extended along the line of feed, and provided with a flange 35, to support and guide away the trimmed-off part X of the sole. In the form shown in Fig. 1, the shield 27 is rigid with the presser-foot 29 and thus transmits the necessary pressure to hold the sock-lining I, upper U, and platform cover C on the worksupport 2; the knife 23 is clamped to the presserfoot 29, and the upper part of the latter fits over the sole to hold the marginal portion thereof substantially in a constant horizontal position in spite of any tilting of the shoe which may be necessary during stitching. The blade 23 is wedge-shaped in plan, to open the cut for the entry of the needle, and is passed in to its cutting position in the work through a notch previously made in the sole by hand or by an attachment which may have similar work-holding and cutting parts to those shown. The presserfoot 29 is carried by an arm 45 pivoted at 43 and normally pressed downwards by a spring 59 which surrounds a rod 51 pivoted to the arm 45 and bears on an arm 55 also pivoted at 43 and provided with an adjustable abutment 79 to engage a block 83 on the arm 45; a spring-pressed pawl 73 engages a rack 47 on the arm 45 to lock the presser-foot against the work, and at each stitch a cam-actuated lever 67 disengages the pawl by an abutment 75 and lifts the foot by the arm 55 engaging the arm 45 through the abutment 79. According to the first Provisional Specification the presser member 29 may be in the form of a spring-pressed collar sliding on the fixed blade 23, or alternatively the member 29 may be fixed on its carrier and the blade 23 and shield 27 resiliently mounted thereon. In a modification, Fig. 4 (not shown), the blade 23 is vertically reciprocable in a guide in the presser member 29, and is carried by an arm which is operated through a pair of toggle links from a cam-actuated member, the blade having a cutting edge at the bottom and optionally also on its inclined leading edge; the toggle is normally held straight by a spring, but can be broken by a connection from a treadle to retract the blade independently of the mechanism, for the insertion or removal of work. According to the second Provisional Specification such a reciprocating blade may be resiliently coupled to its carrier, so that its motion is stopped by the shield member or by the engagement of abutments on the carrier and the presser; the blade may enter a recess in the shield member. Specification 485,010 also is referred to in the second Provisional Specification.