Patent GB-1065433-A (GB)
Title: Method and apparatus for affixing fastening elements to tapes
IPC: D05B29/06
Filed: 1965-07-06
Abstract: 1,065,433. Sewing machines. V. ARNOLD PROPRIETARY Ltd. July 6, 1965 [July 6, 1964], No. 28647/65. Heading D1G. A sewing machine for attaching fastener elements to a tape comprises first cam means controlling the operation of fastener delivering means, and second cam means having one cam surface controlling transverse oscillatory movement of the needle bar and associated shuttle means, and a second cam surface controlling movement of the tape. A row of eyelets 76 is secured between the upper and lower layers of a folded tape 68, and a corresponding row is secured between a narrow tape 70 and the upper layer of tape 68. The eyelets of each row are separated from the adjacent eyelets by six straight stitches disposed between the bases 78 of the eyelets and the respective edges of said upper layer and tape 70, five transverse stitches, made while the tape feed is inoperative, then secure the limb of base 78 adjoining one limb of the projecting eye 77, two straight stitches are then inserted within the base, and finally five transverse stitches secure the limb of the base adjoining the other limb of eye 77. A needle bar 13, mounted in a pivoted frame 109, carries two needles 132 and is reciprocated by a pitman 134 from the arm shaft 14. A sleeve 136, rigid with pitman 134, slidably engages one arm 137 of a lever, the other arm 138 of which carries a thread take-up. Vertical axis looptakers 183, 184 are carried by a pivoted frame 110, the distance between the looptakers being adjustable by means of a screwed spindle 189. The looptakers are driven by a bed shaft 199 driven via a vertical shaft 20 from the armshaft 14. A hollow horizontal shaft 17, driven from shaft 20, journals a shaft 27 coupled to shaft 17 by a dog clutch (25) Fig. 5. An endless chain (91) Fig. 16, is driven from shaft 17 and is provided on three consecutive links with cam rollers (92) adapted to co-operate with a follower on one arm of a lever (94), the other arm of which is connected by a link (95) to a lever (98) having a forked arm engaging a circumferential groove in the driven plate of clutch (25), whereby the latter is disengaged when said follower engages the rollers (92). A cam disc (32) at the end of shaft 27 remote from clutch (25) co-operates with a lever (35) to rotate a shaft 52 via a rack bar (37) and pinion 49. A bar 54, pivoted on shaft 52, overlies a bar 55 rigid with shaft 52. A pin 56 rises from bar 55 through an arcuate slot 57 in bar 54 to abut a spring 56a anchored at 54a to bar 54, for biasing the latter forwardly. Arcuate blades 59, 63, carried by bars 55 and 54 respectively, are movable in grooves formed in a fixed plate 66. The tapes 68 and 70 are guided to the stitching points by plate 66 and a recess 72 in a fixed plate 73 respectively, the edge of the upper layer of tape 68 being raised by a tongue 67 on plate 66 to permit insertion of the eyelets 76 therebeneath. The eyelets pass through recesses 53 in plate 65 and are fed to the stitching points under notches 80, 81 in plate 73 by the blades 59, 63, blade 59 being stopped at the stitching point by the engagement of bar 54 with a fixed abutment 79. The work is held at the stitching points by leaf spring members 74, 75 carried by plate 73. The end of shaft 27 adjacent clutch 25 carries a pair of cam discs (103), (139) Fig. 5. Cam 103 co-operates with one arm of a lever 111, the other arm of which is connected by an adjustable link 116 to a crank disc 117 on a vertical shaft 125. Disc 117 is connected by a link 120 to the needle bar frame 109, and a crank 129 on shaft 125 is connected by a link 130 to the looptaker frame 110. Oscillation of lever 111 thereby produces simultaneous transverse movements of the needle bar and looptakers. Cam (139) co-operates with a lever 142 to reciprocate a bar 146 formed with a groove embracing a roller 148 on a linkage coupled to a pivoted gear housing 153 containing a gear (163) Fig. 10, on a vertical shaft 160 driven from the armshaft 14. Gear (163) meshes with a gear (165) rigid with a worm normally meshing with a gear (167) on a shaft (172) carrying a knurled lower feed roller (174). Gear (167) meshes with a gear 168 on a shaft 169 carrying an upper feed roller having knurled portions 180, 181. Said worm has a portion of straight grooving, whereby gear (167) is rotated to effect tape feeding only when the needles are disengaged from the tapes. Actuation of lever 142 serves to swing housing 153 for disengaging said worm from gear (167) to render the tape feed inoperative. The arrangement of the cams (32), (103) (139) and the cam rollers (92) is such that when the three rollers (92) engage lever (94) to disengage clutch (25), three straight stitches are made. When clutch (25) is re-engaged, two further straight stitches are made while a pair of eyelets 76 are fed to the stitching points, followed by five transverse stitches, two straight stitches, five transverse stitches and a final single straight stitch. Clutch 25 is then disengaged to re-start the cycle. The number of consecutive rollers (92) used determines the spacing between the eyelets.