GB806639A - Electrically driven sewing machines, particularly for closing bags - Google Patents

Abstract

806,639. Sewing machines. EL-CU S. P. A. June 29, 1955 [Oct. 30, 1954], No. 18806/55. Class 112 A sewing machine particularly adapted for closing the mouths of sacks comprises a pistol-grip type handle 10 attached to a body which is of comparatively small size and consists of a rearward portion 11 containing an electric motor 72, and two forward parallel extensions 12 and 13 the former of which contains the drive for the looptaker and work feed, and the latter the needle drive Driving. The electric motor is coupled by gears 70, 73 to an intermediate shaft 74, and the latter is coupled by gears 75, 76, 77 to shafts 42 and 43 in extensions 13 and 12 respectively. Stitch forming. A needle 30 co-operates. with a rotary looper 32 carried at the end of shaft 43 in the formation of chain stitches. The needle bar 31 is coupled by a pitman 40 to a crank 41 carried by shaft 42, the axis of which intersects the axis of the needle bar at a point to one side of the bearings 31a, 31b. for the latter and nearest to the needle, and the pitman being connected to the needle bar at a point between said bearings. The needle thread take-up is an oscillating arm, the pivot of which carries a slotted arm engaged by a pin on the needle bar. Work feed. A presser bar 35, which is slidably mounted in extension 13, carries a presser foot 34 and is biased towards the work: by a spring 36. A feed dog 33, which co-operates with the presser foot, has a hub portion 45 which is journalled on an eccentric portion 44 of shaft 43. A pin 50, which extends from hub 45, passes loosely through a hole 51 in the wall of extension 12, and a spring 52 which encircles pin 50 serves to bias the feed dog against the presser foot. Spool holders. A thread spool 20 is detachably fixed to a rotary post 21, which extends from the portion 11, by means of spear-shaped pins 22 which are carried by the post and enter apertures 23 provided in the spool. Thread cutters. A fixed blade 80, which is carried by the extension co-operates with a blade 83 carried by a bar 82 which is continuously reciprocated while the machine is in operation by means of a pair of lugs 84, 85 which project from bar 82 and embrace the hub portion 45 of the feed dog.