Patent GB-190913199-A (GB)
Title: Improvements in Sewing Machines.
Inventor: WILLIS PERCY RICHARD JULIUS
IPC: D05B57/22
Filed: 1909-06-05
Granted: 1909-08-19
Abstract: 13,199. Willis, P. R. J., [Vannette, J., Yingling, C. J, and Yingling, G. S.]. June 5. S e w i n g - m a c h i n e s ; lockstitching by shuttles.-Relates to two-reel sewing-machines and consists in the provision of improved spool-carrying mechanism, means specially applicable for driving the latter, and improved needlebar operating means. A reciprocating spool-case 7, of cylindrical form but having a V-shaped lower part to contain an ordinary commercial spool, is slidably supported by a reciprocating frame 8, which in turn is slidably supported by the bed-plate 1, grooves 10, 12 on the case and frame respectively engaging arms on the frame and bed-plate for this purpose. The spool-case engaging portion 9 of the frame 8 has an opening 13 to permit the passage of the needle loop around the spool, and the needle-loop is pushed along the spoolcase by means of a projecting part 15 at the end of the opening 13, the ends of which are connected by the part 14. The frame 8 is reciprocated by a lever 18, pivoted at 19 and actuated from the shaft 16 through a crank 20 and a link 21. The spool-case is reciprocated oppositely to the frame 8 by means of a driver on a frame 23 slidably held on the bed-plate by lugs 24 engaging slots 25; and being operatively connected to the link 21 by a block 26 engaging a slot 27 therein. The driver, Fig. 5, consists of two portions 28, 29 for engaging the ends of the case, and a connecting-part 30, the portion 28 having an arm 31 which is rigidly attached to the frame 23, while the portion 29 is pivoted at 33 so that it may serve as a latch over the open end of the spool-case for removably retaining the spool therein. The case is made to take the largest spool, and to prevent undue endlong movement when smaller spools are used, an adjustable wall 34 extends through one end 28 of the case, a plate 35 on which is slidably supported on the driver by flanges 37. A spring 38 normally holds the wall 34 sufficiently far advanced for a spool of minimum size, and permits the wall to yield for larger spools when the latch 29 is closed. To allow thread clearance at the spool ends, the wall is moved back a short distance after the insertion of the spool by means of a lever 42 pivoted on the driver arm 36 and having a dog 44 for engaging a series of teeth 45 on the wall of a slot 46 in the plate 35, the opening 47 for the pivot 43 being elongated and the pivot held against the top end thereof by a spring-pressed block 50 carrying a pin 51 extending through slots in the lever, and with one of its ends 51' engaging the arm 36 to limit the upward movement of the block, and so causing the spring 48 to hold the lever down. The lever 42 is normally held with its dog 44 out of engagement with the teeth 45 by means of a projection 53, Fig. 4, on the arm 36 engaging the pin 51<1>. To provide the thread clearance, the lever 42 is swung away from the spool, whereupon the dog 44 engages the teeth 45 and moves the plate 35 back through a distance predetermined by the length of the slot 47, the lower end of which is brought into contact with the pin 43. The pin 51<1> is now locked by the other side of the projection 53. The lever 42 may be released to act as a spool-ejector after the latch 29 has been swung open. The spool-case has also impinging tension plates 55 on its exterior side. A substantially triangular-shaped hook 58 is mounted on the end of the shaft 16, which hook seizes the needle-thread loop and also opens it into the path of a spreader 60, which moves forward to engage the loop, to carry it over and across one end of the spool-case and through the opening 13, the hook at the same time moving downwards, their combined operation causing the loop completely to encircle the spool-case. As soon as the loop is carried into the opening 13, this is moved to the other end of the case to permit the release of the loop which is carried along by the pusher 15 and the hook 58 to allow its being drawn up to interlock the underthread. The spreader 60 is carried at the upper end of an arm 61 on a shank-portion 62 operated from an horizontally swinging arm 63 pivoted at one end on a stud 64 and having mounted thereon a tubular rocker shaft 65 having two downwardly-extending arms 66, to one of which the shank 62 is attached and to the other of which one end of a pitman 67 is connected, the other end being connected by a sleeve 68 with a crank 69 on the shaft 16. The shaft 65 is thus both rocked on the arm 63 and swung on the stud 64, which compound movement moves the spreader in a generally circular path about the end of the spool-case, with a gyratory motion which turns the spreader finger to cause it first to enter and then to retain positively the needle-loop, and afterwards to release it freely. Driving.-To impart a substantially uniform rotary motion to the lower shaft 16, it is connected to the driving-shaft 6 by a pitman 75 connected at its upper end to a crank 76, and at its lower end to a stud 77 engaging a block 78 slidably supported in a grooved crank-arm 79 on the shaft 16. At a point centrally between its ends, the pitman 75 is connected with a bar 80 by a stud 81, and the bar 80 is pivoted at its ends to two links 83 pivoted on fixed studs 84. Needles, driving.-To give the needle the requisite movement for proper co-operation with the shuttle, the upper shaft 6 terminates in a sleeve 85 having a slot 86 extended by lugs 86<a>, in which slot works a roller 92 on a crank-arm 89 of a shaft 88 mounted opposite to and below the shaft 6. On the roller-pin 90 is mounted the upper end of a pitman 91, the lower end of which is engaged by a stud 93 on a sleeve 94 secured to the needle-bar.