Patent GB-980641-A (GB)
Title: Sewing apparatus
IPC: D05B33/00
Filed: 1961-11-09
Abstract: 980, 641. Sewing machines. S. EMSIG, J. EMSIG, and J. R. SUCHER, [trading as EMSIG MANUFACTURING CO.]. Nov. 9, 1961 [Nov.10, 1960], No. 40174/61. Heading D1G A cyclically-operated machine for sewing buttons at spaced-apart positions on a workpiece comprises a work-holding carriage provided with abutment means for stopping the carriage at the stitching positions, and means for engaging and releasing the stop means in cyclically-timed relation to the starting and stopping of the sewing machine at the stitching positions.  The machine is as described in Specification 77.6, 001. Shanked buttons travel from a holder 14 through a shoot 15 to a presser foot 16 which is connected to the presser bar 16a and also to a bar 84 pivoted at 84a to the machine frame. On completion of a button sewing operation the machine stops and the presser foot is raised, while a pawl 204, pivoted on the machine frame, co-operates with a roller 212, mounted on the presser foot, to remove the sewn button from the presser foot. The machine is mounted on a table 10, the front edge of which supports a work-holding carriage adapted to feed the work from one sewing position to the next. The carriage comprises a bar 22 which is slidable on a fixed bar 21 within fixed pairs of guides 23 and 23a. Posts 26 and 27 at respective ends of bar 22 carry a bar 32 to which intermediate stops 34 and end stops 100, 101 are adjustably attachable. A bar 29 rigid with post 26 is connected by a cable 31 to a spring-loaded drum 30 adapted to move the carriage to the right, the extreme right hand position of the carriage being determined by the engagement of stop 100 with the guides 23, and the extreme left hand position by the engagement of stop 101 with the guides 23a. Bars 52 and 55, adjustably attached to posts 42 and 43 respectively, carry at their free ends work-supporting plates 60 and 61 which may be aligned with the work support 17 of the machine. A lever 66, pivoted at 68 to bar 52, is formed with a shank 74 carrying a work-holding tooth 64 which is biased by a spring 70 into a groove 62 in plate 60. A lever 67, pivoted at 69 to plate 61, carries a work-holding tooth which is biased by a spring 71 into a groove in plate 61. A block 80, adjustably secured to bar 84, is formed with a sloping cam surface 82. A block 81, carried by a bar 87 adjustably secured to a fixed post 91, is formed with a sloping cam surface 83. The parts may be so adjusted that when the carriage is in its extreme right hand position, rollers 76, 77 on levers 66 and 67 engage the respective cam surfaces 82, 83 to raise the  said work-holding teeth to allow a completed work piece to fall by gravity, and a new workpiece to be stretched between the plates 60, 61 with its right hand edge abutting an adjustable stop 79 on plate 61. A fixed block 105 carries pawls 106 and 125 adapted to co-operate with the stops 34 to halt the carriage at the button-sewing positions. Pawl 106 is loosely pivoted on a horizontal stud 107. Pawl 125 is provided at its front end with depending fingers 141 and 147, and is loosely mounted at its respective ends on vertical studs 126 and 131, a compression spring 128 being interposed between pawl 125 and the head 129 of stud 126. A spring 113 acting on a rearward extension 114 of pawl 106 biases the rear end of the latter to the right against a bevelled portion 116 of block 105, and also biases the front end of pawl 106 downwardly. A stud 142 on pawl 106 thereby engages One arm of a lever 135, pivoted to block 105 on a horizontal stud 136, whereby the other arm of lever 135 engages finger 141 to raise the front end of pawl 125 against the bias of spring 128. A compressed air line L1 is connected to a valve 150 having a plunger 151a spring-biased to the valveclosed position adjacent pawl 106 to isolate a control cylinder C1 which is connected by a line L2 to valve 150 and which contains a piston rod coupled to the starting lever of the machine. Line L1 is also connected via a line L3, a normally open spring-biased valve 163, and a line L4 to a control cylinder C2 containing a piston which is thereby operated against spring bias, to raise the presser bar 16a, via a linkage 16b, 171 and 172. When the carriage is moved manually to the left to load the spring drum 30, the stops 34 cooperate successively with a cam surface 149 on pawl 106 to raise the latter above the stops. When the carriage is moved by the spring drum 30 to the right, a stop 34 will engage a flat surface 145 on pawl 106 to pivot the latter horizontally to operate plunger 151a. Valve 150 is thereby opened to energize cylinder C1 for operating the starting lever of the machine. A switch associated with the starting lever is also thereby closed to energize a relay 165 for closing valve 163. Cylinder C2 is thus isolated, and its piston is spring-moved to lower the presser bar 16a. A block 120 carried by bar 84 thereby engages the upper end of a rod 117 secured to the read portion of pawl 106. The front end of the latter is thus raised to release both the stop 34 and pawl 125, the front end of which is then lowered by spring 128. The stop 34 thereby moves into engagement with the lowered finger 147 to establish the sewing position. At the end of the sewing operation presser bar 16a is automatically raised, whereby block 120 releases rod 117 and finger 141 is thereby raised to release the stop 34. It is stated that if the button-ejecting pawl 204 is not employed, the end of the button shoot 15 will be aligned in the direction of movement of the work-feeding carriage. Specifications 701,586 and 720,320 also are referred to.