GB206463A - Improvements relating to work feeds for sewing machines - Google Patents

Abstract

206,463. Pearson, W. May 4, 1922. Sewing-machines; feed by devices engaging the upper surface of the work; presser-bars with periodic control.-The hub 68 of a lever 69 is loosely mounted on a stud 67. Fig. 1, fixed to the sewing-machine casing 38, and is linkconnected to a collar 71 on the presser-bar 72. Round a nut 73 which is adjustably mounted on the threaded hub 68 is adjustably clamped an arm 75, which is spring-connected to an arm 76<x>, Fig. 1, loosely mounted on a shaft 77. The shaft 77 is mounted in a lever 78, Fig. 4, and oscillates in a slot in the casing. The end 82, Fig. 3, of the lever 78 is universally link-connected to an arm 89 pivoted to the casing. A block 91 on the arm 89 travels in a slotted link 93 which is pivoted at 94 to a lever 95. A shaft 96 on which the lever 95 is mounted is oscillated from a rotating cam 47<x>. A screw 110 adjustable in a lug 109 of the arm 76x bears on a lug 111 of an arm 104 fixed to the shaft 77. The lever 75 is limited in movement by a screw 112, Fig. 1. In a block 153 on the presser-bar is slidingly pivoted a a feed-lever 156, Fig. 3, spring-connected to an extension 103 of the lever 93. The block 153 has an extension 161 in which is mounted the presser-foot 162. To the block 153 are secured cam-plates 164, each having a slot 165 through which passes a. pin 1'66 on the feed-lever. A link 167 connects the pin 166 and the member 103. A lever 170, Fig. 1, mounted on the threaded hub 68 is oscillated from the cam-disc 47x to engage the nut 73 and raise the presserbar. The descent of the presser-bar does not actuate the, nut 73. The end 174 of the arm 104 bears on the block 153 and helps to lock the lever 170 to the nut 73. Adjustment of the member 89 regulates the feed. Specification 201,997 is referred to.