Patent GB-381553-A (GB)
Title: Improvements in or relating to tufting machines
IPC: D05B27/22
Filed: 1931-05-27
Abstract: 381,553. Sewing-machines. GROVES, W. W., 30, Southampton Buildings, London. -(Carter Bros., Inc. ; Cherokee Boulevard, Chattanooga, Tennessee, U.S.A.) May 27, 1931, No. 15545. [Class 112.] Tufting-machines.-In a tufting-machine of the kind wherein a reciprocating needle 15, Figs. 1, 3 and 4, carrying a yarn or thread 27 operates to produce and secure a succession of loops in stitch-like form on a fabric, a gripperrest 184, which co-operates with a gripper-arm or loop-retainer 58, oscillates therewith to reduce the pull on the thread. An auxiliary gripper 193, working against a stationary abutment 104, co-operates with the gripper 58 to prevent the yarn from pulling out of the material during upward movement of the needle. An adjustable rest 103 for the bill of the looper 90, may also be provided. The machine, as shown, comprises a base 5 supporting a standard 6 and head 7, in which is reciprocated, by a lever arm 12 and eccentric 10, a needle bar 14. Yarn 27 passes to an eyed needle 15 from a tension pulley 26, via spring loops 26<1>, 28', a tension pulley 28 and a hole in a tension sleeve 158, which can be moved to and fro, against a spring 163, by a cam 175 on the main driving shaft 8, to control the tension. A presser-foot 17 of usual construction is carried by a pivoted lever 115 and is pressed against the work by a spring 125, a link 118, connected to the lever 115 and movable by a cam 42 on the main shaft 8, moving the presser-foot 17 to permit work feed. The presser-foot cooperates with a throat-plate 18 through a slot in which works a four-motion feed dog 24, which is supported on a feed arm 20. The forward and rearward work-feeding movement is imparted to the arm 20 by a yoke 22, Fig. 15, which can be swung to engage any one of a series of cams 23, 23a, 23b, so that the length of stitching may be varied. A raised tongue 218, Fig. 13, on the throat-plate 18 presses a completed line of stitching into one of a pair of grooves 219 at the sides and which register with grooves in the presser-foot to move it out of the way of the needles. An oscillating needle-guide bar 200 moves rearwardly of the needle 15 to prevent it being moved out of alignment when the main gripper-arm 58 and gripper-rest 184 are moving rearwardly together, and, when the needle is raised, the bar 200 is moved to the right out of the way of a removable reversible cutter 75 which severs the loops, when it is desired to cut the loops as formed. The loop-retainer 58 has a serrated free end and is mounted on a shaft 31 which can be rocked by a cam 29 on the main driving shaft 8, and which can also slide in its bearings 33 to and fro under the action of a cam against an adjustable spring 52. The movable gripperrest 184 is moved synchronously with the loopretainer 58 by a cam on the main shaft which engages a yoke 180 pivoted on the shaft 31 and on which the rest 184 is carried. The auxiliary gripper 193 is carried by an arm 191 integral with a sleeve 185 on a vertical pivot 186 and is swung, against the action of a spring, towards and from the fixed abutment or gripper-rest 104 by a cam 190 engaging an arm 188 on the sleeve 185. Transverse rockshafts 63, 64 oscillated by cams 66, 83, respectively, operate, respectively, a removable cutter blade 75 carried by an arm 73 on the shaft 63 and looper mechanism 90. The bill 92 of the looper 90 engages between the looped yarn and the needle when in lowered position, and an abutment 103 is adjustably supported on a foot 100 which also carries the gripperrest 104 so as to allow the looper 92 to pass over it and to permit the cutter 75 to just pass. Specifications 381,565 and 381,566 are referred to.