GB491083A - Sewing machine - Google Patents

Abstract

491,083. Sewing-machines. SINGER MANUFACTURING CO. Feb. 25, 1937, No. 5647. Convention date, April 16, 1936. [Class 112] In a laterally - vibrating - needle sewing- machine, the needle assists the feed dogs in feeding the work and the bar mechanism is modified to work at high speeds. The main shaft 8 operates the needle bar 15 in the swinging gate 17 by usual means and also operates the undershaft 19 which operates the loop-taker and feed dogs. The shaft 19 also operates the needle-vibrating shaft 193 by a link 191 and cranks 192, 190. The shaft 19 operates the loopers 36, 37 by spiral gears 32, 31. The feed dog 95 is carried by the feed bar 99 which has a fork 100 engaging a feed lift eccentric 101 carried by the shaft 19. The front end of the feed bar 99 is pivoted to feed rocker arms 104 on the shaft 105 journalled in the frame-lugs 57 and 106. A split boss 108 is clamped on the rock shaft 105 and carries a tubular rock arm 109. A pin 112 slides in the bore of the arm 109 and carries a strap 113 embracing the feedadvance eccentric 114 adjustably carried by the shaft 19. The longitudinal axis of the pin 112 passes through the centre of the eccentric 114 and through the axis of the shaft 105 so that the median position of movement is in the plane containing the longitudinal axes of the shafts 19 and 109, giving a balanced arrangement for operation at high speeds. The sidewise movements of the slide pin 112 effect the rocking movements of the arm 109, thereby transmitting feed-advance and return movements to the dog 95. The eccentric 114 may be provided with a driving member 131, the eccentricity of which may be varied to vary the feed after the manner described in Specification 491,132. The lubricating means are also as described in Specification 491,132.