GB491132A - Sewing machine - Google Patents

Abstract

491,132. Sewing-machines. SINGER MANUFACTURING CO. Feb. 25, 1937, No. 33675. Convention date, April 16, 1936. Divided out of 491,083. [Class 112] In a machine in which a laterally vibrating needle assists the feed dog in feeding the work, the feed-advance eccentric operates the feed rock shaft by a pin-and-socket connection and this rock-shaft operates the needle-vibrating mechanism. The eccentricity of the feedadvance eccentric is variable to vary the feed stroke. The feed dog 95 is carried by the feed bar 99 and receives its up-and-down movements from a fork 100 embracing the eccentric 101 on the lower shaft 19, Fig. 3. The feed rock shaft 105 is operated by the eccentric 114 on the shaft 19 through a strap 113 carrying a pin 112 sliding in a socket in the arm 109 bolted to the shaft 105, Fig. 5. The eccentric 114 is carried on a slide 128 with a pin 144 passing through a slot 146 in the slide carrier 131 to engage a spiral groove 143 in a member 139, Fig. 9. A gib 135 is inserted between the slide 128 and bearing 134 to take up wear and is secured by screws. To adjust the eccentricity of the eccentric 114 to vary the feed, the detent 150 is depressed to engage the notch 149 in the member 139 to prevent it from turning. The shaft 19 is then turned to force the pin 144 to ride in the groove 143 to displace the slide 128. Holes 147 may be provided in the groove 143 to take screw stops for the pin 144 so that rapid adjustment from one feed length to another may be made. The needle is vibrated by a rod 193 and crank 194. This rod is rocked by a lever 191 connected to the feed rock shaft 105. Lubricating. The eccentric 101 is lubricated by a pad 102. A reservoir 115 has ducts 118, 119 opening to grooves 120 and 121 encircling the inner face of the strap 113. The grooves 120, 121 converge into a bore 123 in the pin 112 to lubricate the bearing surfaces of pin 112 and arm 109 via ducts 124. Oil may be supplied to the eccentric from above by the oil pipe 126. An opening 127 is provided in the bed plate to supply lubricant to the boss 115.