Patent GB-628061-A (GB)
Title: Device for pressing seams in seaming machines
IPC: D05B35/02
Filed: 1947-06-10
Abstract: 628,061. Sewing-machines. SUPERBA MANUFACTURING CO., Inc. June 10, 1947, No. 15213. Convention date, Nov. 9, 1943. [Class 112] [Also in Group VIII] Apparatus for seaming together plies of material includes a guide member lying between the plies and having an edge offset from or oblique to the line of seam and means to draw the material substantially straight from the seaming point over the guide, so that part of the material adjacent to the seam moves round the guide edge and a fold is formed adjacent to the seam. Means for pressing the seam and fold are preferably provided, and these may comprise a pair of rollers which serve also to draw the material over the guide. The guide may be adjustable, and may be of variable form. Auxiliary guiding supports for the material before and during seaming may be provided. The plies of material may be trimmed during seaming, and means associated with the pulling rollers may be provided to carry away the trimmings. The form of apparatus described, shown in plan in Fig. 1, is particularly designed for sewing together the edges of a folded-over piece of material to form a tube for subsequent cutting into bias cloth. The folded material is led to the machine over a roller 19, supported at one end only, on a post 20 on the table, the plies then passing respectively above and below a supporting arm 21, fixed to a post 23, and a guide plate 31 fixed to the machine bed 11 at 34, spacing plates being placed below and above the guide plate at its point of attachment and a plate .39, for holding down the top ply of material, being fixed above it. At the rear of the needle 14 and trimming blade 15, the guide plate has an edge 42 which passes across the line of seam so that the seam rides on top of the plate and the lower ply of material is pulled out to the right to form a fold at a distance from the seam the material is then in the form of a tube, and is held against the edge 42 by a spring 28 on a rearwardlyextending part of the arm 21. The guide plate 42 extends almost up to a pair of rollers 59, which draw the seam straight from the needle and press the free edges of material down on either side or both sides of the seam line. The rollers 59 are driven from the upper shaft of the machine by bevel and worm gears and an inclined shaft supported by standards on the table. The shaft of the lower roller may have a square portion to support and carry away the strips of material trimmed off by the knife 15, or auxiliary rollers similar to 59 may be provided for this purpose on the same shafts. In addition to the plate 31 a wire 43 is provided to guide the material during sewing ; this is carried by a plate 44 on the machine bed, and lies between the needle 14 and knife 15; it may be formed integral with the plate 31, the plate 44 being formed by an arm extending from the fixing portion of the plate 31. The part of the plate 31 near the rollers 59 may be hinged to the remainder so that its end may be in the same place regardless of vertical adjustment of the main part of the plate. In a modification the guide plate 31 is replaced by an arm extending rearwardly from the arm 21 and hinged at its middle so that the inclination of the edge 42 can be varied to alter the position of the fold relative to the seam ; the rear end of the guide arm is supported by an adjustable extension of the part 27 of the arm 21. The apparatus may be applied to an overedge sewing-machine.