GB412891A - Feeding mechanism for sewing machines - Google Patents

Abstract

412,891. Sewing-machines. FAIRWEATHER, W. C., 65, Chancery Lane, London.- (Singer Manufacturing Co. ; Elizabeth, New Jersey, U.S.A.) Feb. 21, 1934, No. 5690. [Class 112.] In a machine with differential feed dogs, the feed rocker has a projecting boss which operates the main and auxiliary feed bars. The invention is shown as applied to an overseaming machine. The feed rocker 5 is fixed on the rock shaft 4 and has two lateral spaced arms 6 and 7, each arm having an aperture to receive a pivot pin 8. The rocker 5 is rocked by the main shaft 2 through an arm 12 pitman 9 and eccentric 10. The pivot pin 8 carries the enlarged apertured end 14 of the auxiliary feed bar 15 which carries the auxiliary feed dog 17. The main feed bar 18 is slidably carried on the auxiliary feedbar and is provided with a rib 19 which enters a channel 20 in the auxiliary bar, and a longitudinal aperture 21 which receives a stud 22 carried by the auxiliary bar. This connection permits the main feed bar to be reciprocated independently of the auxiliary bar. The main feed bar carries the main dog 23, in rear of and in alignment with, the auxiliary dog. The auxiliary bar 15 overhangs the usual feed lift eccentric on the main shaft and a short pitman 25 embracing this eccentric is pivoted to the bar 15 by the stud 26. This connection gives both bars their rising and falling movement. To vary the throw of the main dog relatively to the auxiliary dog, the main feed bar is connected to an adjustable sliding member 27 by a link 28. A boss 31 can be adjustably secured in any position in a slot 29 in the member 27.