GB408827A - Improvements in or relating to feeding mechanisms for sewing machines - Google Patents

Abstract

408,827. Sewing-machines. ARMSTRONG, J. J. V., 12, Church Street, Liverpool.-(Union Special Machine Co. ; 400, North Franklin Street, Chicago, U.S.A.) June 2, 1933, No. 15952. [Class 112.] The feed bar 32 of the upper dog and the presser bar 47 of a clamp feed mechanism are mounted horizontally. The dog 30 and the presser foot 31 have a work engaging movement imparted to them by an eccentric strap 19 and linkage 57, 54. The link 54 operates the dog through a lever 49, a pivot 50, and an arm 35 on which the feed bar 32 is slidably mounted. The presser bar 47 is pivoted to the link 54 and is also connected to the lever 49 by a link 51. The lever 54 thus causes the feed dog 30 and the presser foot to engage the work alternately. A work feeding movement is imparted to the dogs 20, 30 by an eccentric strap 24 and a feed rocker 23. The feed bar 32 is mounted in brackets 33, 34 and is reciprocated by a link 43 and collar 40. To prevent the bar 32 from turning about its axis, the collar 40 is provided with a lug 41 which engages a slot 38. The lower feed dog 20 is rigidly secured to its feed bar 22 which is operated by the feed rocker 23. A work engaging movement is imparted to the dog 20 by an eccentric strap 28. A slotted clamp 44, 45 permits relative adjustment of the dogs. Specification 327,296, [Class 112], is referred to.