GB989052A - Improvements in the production of ring-carrying straps primarily for brassieres - Google Patents

Abstract

989,052. Sewing machines. KAYSER BONDOR Ltd. Jan. 25, 1962 [Feb. 11, 1961], No. 5169/61. Heading D1G. In a machine for securing a loop of strap to a ring, especially for brassieres, the end of a length of strapping is passed through the ring, the strapping is severed behind the ring, the severed length of strapping is folded about the ring, and the overlapping portions of the folded strap are sewn together. As shown, a slotted ring-feeding bar 2 reciprocates horizontally from a retracted position to a position at an assembly station AS to present thereat a pair of rings 1 withdrawn from the lower end of a vertical shoot 3. Strapping ST is then fed vertically from a reel R through the rings via a C-shaped folding guide 4 and a spaced, similar guide 4a of smaller radius. The strapping is then severed in the gap G between the guides by a movable blade 6 co-operating with a fixed blade 7 to leave a portion St1 of strap above the rings shorter than the lower portion ST2. Bar 2 then moves further forwards, whereby the portions ST1 and ST2 are folded together by engagement respectively with a fixed plate 5 and the edge 40b of a cutout 40a in a table 40 arranged for movement in a direction transverse to the movement of bar 2. A presser foot 9 then momentarily clamps the portions ST1 and ST2 against a spring-biased plunger 40c located in a slot 40e formed in table 40 while bar 2 withdraws to its retracted position. Portions ST1 and ST2 are then clamped against table 40 by a presser 8 pivoted at 8a to a bracket 45 carried by table 40. The latter then commences to move rearwardly, whereupon a fold-line member 111, slidably mounted in bracket 45, moves downwardly to engage the free end ST3 of portion ST2. Further rearward movement of table 40 causes a folder member 11, mounted on table 40 and arranged for both sliding and pivotal movement, to fold end ST3 about member 111 and upon portion ST1. The strap is released by the members 8, 11 and 111 when the portions ST1, ST2 and ST3 pass beneath the presser foot 13 of a sewing machine 59 to be stitched together by a needle 12. The machine comprises a stand 14 in which is journalled a shaft 28 driven by a belt 29 from a continuously running motor 30. Respective cams on shaft 28 oscillate three pivoted arms 20, 24 and 27. Arm 20 is connected by a link 19 to the batton-feeding bar 2. Arm 24 is connected by a link 23 to the blade 6. Arm 27 is connected by a link 26c to a strap-feeding member 26 pivoted in a bracket vertically slidable in guide 4. A rotary cam 38, driven from shaft 28, actuates a cam follower 39a connected by a link 39 to table 40 and by a guide link 41 to frame 14. The sliding movements of the fold-line member 111 are controlled by a cam plate 48 co-operating with a cam follower 47 rigid with member 111. Folder member 11 is slidably mounted at one end of, and transversely to the axis of an elongated gear 51 journalled on a hollow shaft 40b rigid with a bracket 40F on table 40. The tail of member 11 serves as a follower to a fixed cam plate 11c controlling the sliding movements of member 11. Gear 51 engages a rack 52 slidable in a bracket 53 on table 40. A follower 52b on rack 52 co-operates with a fixed cam plate 54 control the pivoting movements of member 11. Near the end of the forward movement of plate 40, an abutment thereon is engaged by gear 51 to allow lost movement between the latter and table 40. The sewing machine 59 is driven by a continuously-running motor 61 and belt 63 via fast-and-loose pulleys 64. Cam lobes 42, 42a, 42b, 42c and 42d on cam 38 are arranged to actuate respective switches 43, 43a, 43b, 43c and 43d. Actuation of switch 43 energizes a solenoid 58 for operation of presser foot 9 via a linkage 57, 57a. Actuation of switch 43a energizes a solenoid 60 for lowering the presser foot 13. Actuation of switch 43b energizes a solenoid 50 for shifting a pin 49 into the path of movement of presser 8 for raising the latter. Actuation of switch 43c energizes a solenoid 56 to swing a pivoted arm 55 adapted to shift slide 52 for raising the folding member 11. Actuation of switch 43d energizes a solenoid 62 for operating a belt-shifting fork to start the machine 59. The latter runs until a cam lobe 61b, operated by the needle drive, actuates a switch 61c for deenergising solenoid 62 to stop the machine. The sewn loops, interconnected by a thread chain, pass through an opening 40i in table 40.