Method and means for sealing seams

Abstract

Abstract 928,538. Stitched seams; sewing-machines. D. E. STEM. Sept. 23, 1960, No. 32813/60. Class 112. In a stitched seam joining two overlapped pieces of material 111, 112 (Fig. 6) by at least two parallel lines of stitching 118, cement 117 is injected into the space between the pieces of material while the stitching progresses to render the seam water-tight. As shown, the seam is produced on a sewing-machine having a needle bar 42 mounted in a head 36 and carrying a pair of needles 39. A presser bar 34 carries a presser foot 28 which is formed with needlepassing holes 43 and co-operates with a feed dog 26 formed with needle-passing slots 44. The feed dog and presser foot are also formed with aligned, longitudinal grooves 37 and 38, respectively to accommodate a tube 86 which ends rearwardly thereof. Rearwardly of tube 86 a feed roller 61 co-operates with a presser roller 77. Roller 61 is driven intermittently via a free wheel gear 64 by a crank 66 and connecting-rod 67 from an eccentric 71, the latter being driven by a belt 76 from a motor 74. A work guide, provided in advance of the presser foot, comprises a lower plate 47 fixed adjustably by screws 50 to the work-supporting table 22, and an upper plate 51 pivoted at 53 to plate 47. A flange 54 depending from plate 47 to engage the edge of plate 47 prevents plate 51 from crossing the path of the needles. Plate 51 is formed with a channel portion 56 to guide the edge of the lower piece 112 of material, a step 57 to support the tube 86, and a flange 58 to guide the edge of the upper piece 111 of material. Tube 86 is connected to a tube 87 which carries a pin 88 received in a socket 91 formed on a plate 89 fixed adjustably by screws 93 to table 22. Tube 87 is connected via a tube 97, a stop-valve 99 and a tube 110 to the outlet of a gear pump 103 driven by belt 76. The inlet of pump 103 is connected by a tube 102 to a cement reservoir 101. A relief valve 108 is connected between tubes 102 and 110. Liquid cement issues from tube 86 into the space between the seams 118, and is evenly spread therein when the seams pass between the rollers 61 and 77.

Inventors

• 👤 Donat J Lenney

Bibliographic Details