Patent GB-844257-A (GB)
Title: Improvements relating to sewing machines
IPC: D05B11/00
Filed: 1957-06-24
Abstract: 844,257. Sewing machines. ANCIENS ETABLISSEMENTS BEYROUX. June 24, 1957 [June 22, 1956], No. 19801/57. Class 112 [Also in Group XXXVIII] Padded work sewing, feed by clamps. In a machine for sewing patterns on quilts or the like, the work is fixed to a support movable in two different directions through two friction couplings by two motors, and a plate provided with a groove or grooves reproducing in full size the pattern to be stitched co-operates with a guide member such as a roller, the plate and guide roller being respectively rigid with the support and machine frame, or vice versa. As shown in Figs. 1 and 2 a work support 31 is fixed by columns 30 to a frame 14 mounted by means of rollers 16 to move in a sideways direction #<SP>2</SP> on an intermediate frame 3, and the latter is mounted on rollers 5 to move in a to and away direction #<SP>1</SP> on a fixed frame 1. A shaft 11 journalled in frame 1 carries gears 12 meshing with racks 13 on frame 14, shaft 11 being driven by a fixed electric motor 38 (not shown) via a friction clutch 9 and gears 10. A shaft 23 journalled in frame 3 carries gears 24 meshing with racks 25 on frame 14, shaft 23 being driven by a motor 19, mounted on frame 3, via a friction clutch 21 and gears 22. Switches 27 on frame 1 are operated by frame 3 at the respective ends of its travel to reverse motor 38. Switches 29 on frame 3 are operated by frame 14 at the respective ends of its travel to reverse motor 19. A plate 33 on frame 14 is formed with grooves 34 corresponding to the stitching pattern. As shown, the grooves form a checkered pattern the outside corners 37 of which are disposed at the sides of a rectangle. An arm 35 fixed to the frame of the sewing machine 32 carries a roller 36 disposed in the grooves 34. The shafts 11, 23 are driven at equal speeds and the switches 27, 29 are so disposed that reversal of the motors occurs when the roller 36 arrives at the corners 37. The grooves ensure regularity of pattern, slipping of the clutches occurring when necessary to accommodate the movements of the frames to the motor speeds. In a modification, Figs. 5, 6, 8, 9. 12, motor 38 is controlled by a reversing switch 40 and drives shaft 11 via the friction clutch 9 and two-speed constant-mesh gearing the primary gears of which are controlled by electromagnetic clutches 42, 43. Motor 19 drives shaft 23 in a similar manner. Each motor drive is controlled by five switches 44 for respectively effecting drive in one direction, in the reverse direction, at high speed, at low speed, and disconnection of the drive. Said switches are mounted in a line and each one is operated by a lever 45 pivoted at 46<SP>1</SP>. Each lever is formed with a boss 45a spring-biased towards a respective circumferential groove in a rotary drum 47. Spaced around the edges of the latter are projections 49 which enter corresponding perforations in the edge of a programme tape 46 which is pressed on to the drum by spring- biased rollers 51. The tape is formed with ten longitudinal lines of perforations 56, lines a to e of which correspond to the switches 44 controlling shaft 11, and a<SP>1</SP> to e<SP>1</SP> controlling shaft 23. The perforations 56 are also arranged in transverse lines opposite the perforations 50, each transverse line corresponding to a rectilinear movement of the work support. The boss 45a opposite a perforation 56 passes therethrough to operate the corresponding switch 44. A ratchet wheel 57 carried by the drum is engaged by a pawl 58 carried by one end of a link 59 the other end of which is pivoted to a lever 61 connected by a link 63 to the armature of a solenoid 65. Energisation of the latter thereby serves to move the drum to bring a fresh transverse row of perforations under the levers 45.. Roller 36 is covered by a rubber coating 68 and is flanked by a pair of auxiliary rollers 82 on pins 81 in a bracket 80 pivoted about the axis of roller 36. A plate 80 carried by arm 35 is disposed concentrically about the rollers to bear on the upper surface of plate 33. A rod 72 mounted concentrically with roller 36 is biased downwardly by a spring 73 to project below the latter. The arrangement is such that rod 72 contacts an adjustable abutment 76 situated near the end of a rectilinear length of groove 34, whereby rod 72 is displaced upwardly to operate a switch 66 for energising the solenoid 65 to initiate movement of the drive shafts corresponding to the succeeding rectilinear length of groove. The corner is provided with clearances 83, 84 for the auxiliary rollers 82. The modified arrangement makes possible more varied forms of pattern. It is stated that the grooves 34 may also be curved the friction clutches then slipping to accommodate the movements of the frames 3, 14 thereto.