Patent GB-864364-A (GB)
Title: Bag sewing machine
IPC: D05B13/00
Filed: 1958-11-19
Abstract: 864,364. Sewing machines. SCARRONE, A. R. Nov. 17, 1959 [Nov. 19, 1958], No. 37212/58. Class 112. [Also in Group XXX] Apparatus for sewing bags comprises a worktable, two sets of feeding means adapted to advance workpieces on said table in directions at right angles to one another, means for transferring a workpiece from the end of one feeding means to the beginning of the other feeding means, a sewing machine associated with each feeding means, and means operable by each moving workpiece to operate a device to sever the thread connecting the respective sewing machine and the workpiece after the sewing operation is completed. Successive workpieces 50, 52, consisting of material folded upon itself, are fed upon a work table 2 by a pair of endless conveyer belts 12 past a sewing machine 6 which unites the unconnected longitudinal edges 51 after the latter have been folded together by means 10. The trailing end of the workpiece is then transferred to an endless conveyer belt 21 disposed at right angles to the belts 12, whereby a pair of transverse edges, after being folded together in a further means 10, are united by a sewing machine 8 to form the bottom of the bag. The belts 12 are mounted on pulleys 15 carried at one end by a shaft 16A journalled in brackets 17A, and at the other end by shafts 16B, 16C journalled in a frame 17B. Pins 13, embedded in the outer surface of the belts 12, are adapted to engage the workpieces, and portions 14 of said surfaces are left free from pins to provide for appropriate spacing of the workpieces. The table at the delivery end of the belts 12 is recessed as at 18, and is formed with a transverse slot 19 which accommodates the upper run of the belt 21, the latter being mounted on pulleys 23 and being provided in its outer surface with pins 22. A crank disc 38 on machine 6 is connected by a link 3a to one arm of a double-armed lever 40. The other arm has an adjustable connection with a link 44, and the latter is also connected to a uni-directional coupling 45 on shaft 16B. Rotation of disc 38 thereby serves to drive the belts 12 intermittently. Machine 8 is similarly connected to a coupling 45 for driving belt 21. The leading edge of workpiece 50 after passing machine 6 separates a pair of electrical contacts 33A, whereby a solenoid 32A is de-energized and a thread cutter 31A moves to in-operative position. The leading edge next separates a pair of contacts 34, whereby solenoids 26 and 30 are de-energized, when a spring 35 associated with solenoid 26 moves a plate 24 to cover slot 19, and springs 36 associated with solenoids 30 raise a bar 28. After the trailing edge of workpiece 50 passes the contacts 33A the latter close to energize solenoid 32A, when the cutter 21A severs the thread between the workpiece and machine 6. After the trailing edge passes the contacts 34, the latter close to energize the solenoids 26 and 30. Plate 24 is then retracted to uncover slot 19, and bar 27 descends to strip the trailing end of workpiece 50 from belts 12 and to engage said end with belt 21. When the leading edge of the next workpiece 52 separates the contacts 34, plate 24 moves over the trailing end of workpiece 50 and thereby separates the workpieces one from the other. The edge of workpiece 50 now leads, after passing the machine 8, opens a pair of contacts 33B to de-energize a solenoid 32B for moving a thread cutter 31B to in-operative position. After the trailing edge of the workpiece passes the contacts 33B, the latter close to energize solenoid 32B, when the cutter 31B severs the thread between the workpiece and machine 8.