Patent GB-190407373-A (GB)
Title: Improvements in, or relating to, Sewing Machines.
Inventor: ANGUS EDMUND ALBERT
Filed: 1904-03-28
Granted: 1905-03-28
Abstract: 7373. Augus, E. A. March 28. Sewing-machine spools and the like, winding ; thread end holders ; thread - cutters.-Relates to mechanism whereby an empty thread-spool can be automatically removed from a rotary shuttle, be replaced by a full spool, and subsequently re-wound in readiness for further use. Three spools are used, and are conveyed from the shuttle to a position for re-winding by a plate 77, having three radial arms on each of which an expanding mandrel is slidably mounted. When, by the sound of the machine, a spool is known to be empty, the machine is stopped. The sliding cam-plate 7 is drawn forward, by means of a handle, until locked by a pin engaging with a recess 35. In so doing, a sleeve 5 on the main shaft and a pusher-spindle 2 in the centre of the main or shuttle-driving shaft are moved to the left. The end of the pusher-spindle bears against a washer 8, and forces the empty bobbin out of the bobbin case on to an expanding mandrel or split gripping- spindle 81 carried on the three-armed disc 77, which is kept in position by a stop-disc 98 and locking-bar 96. In addition to pushing out the empty bobbin, the sliding plate 7, by bearing against a sleeve 42, moves a spindle 46, and so forces a clutch 48 on the rear or driving portion of the shaft out of engagement with a clutch 49 on the main shaft and into engagement with a clutch pin 53 on a sprocket-wheel 54, thus throwing the driving-shaft 1 into gear with a cam-shaft 37, Fig. 1. The inclined surfaces 116 of the sliding plates 7 draw a fork 112 to the left and put a clutch 110 into gear with a clutch-pin 109 upon a sprocket-wheel 107. The operator then commences to work the machine in the ordinary manner. The rear portion of the main shaft 1 revolves, and at the same time by means of the sprocket-gear rotates both the cam-shaft 37 and a winder-shaft 105. A cam 69 thereupon forces down a lever 66 until its outer end engages behind the clutch 48 and holds the clutch in gear with the sprocket-wheel 54. Also, a cam 101, engaging with a rod 95, withdraws the locking- device 96. A segmentally-toothed wheel 73 on the cam-shaft engages with a wheel 75 on the spool-carrier 77 and commences to turn the carrier round. The empty bobbin is carried up past an inclined guide 150 and so pushed firmly on to its spindle 81, a full bobbin is brought into position opposite the bobbin-case, and the spare empty bobbin upon the remaining arm is brought into position for being re-wound. The cotton is by this movement led from the full bobbin and is guided by a curved hook 87 on the full bobbin into the empty bobbin, which has been brought to the position for being re-wound, and thence through guides to the supply-reel. A cam 36 then draws back the locking-pin 34, so that the sliding plates 7 and the pusher-shafts 2, 46 may be returned to their normal positions. At the same time a cam 140 operates upon a lever 139 so that a pair of grippers 137, which are slidably mounted at 138 and have been previously opened by a cam 143, are moved bodily forward and their jaws embrace the cotton. A cam-actuated lever 90 now forces a sliding spindle 88 against a plate 85 of the spool-carrier, causing a plate 86 to force the full bobbin forward into the bobbin-case 9. As the cam-shaft 37 continues to rotate, the hook-shaped cam 143 releases the grippers 137, which being closed by a spring 144 grip the cotton prior to being moved back. To thread the tension, a cam 12G releases a hookshaped arm 121, Figs. 1 and 16, and allows a spring 124 to turn the hook up into a horizontal position to engage the cotton. A cam 136 now acts upon a bell-crank lever 134 and draws back the hook, thereby drawing the cotton up under the ordinary tension-piece of the bobbin-case. After the hook 121 is returned to its forward position, it is rotated to its initial position by means of a lever 127 which bears against a projecting pin or horn 130. The cam 149 closes a pair of scissors 146 which sever the cotton. At the completion of one revolution of the cam shaft, the cam 69 will release the lever 66, and so allow the clutch 48 to be disengaged from the sprocket-wheel 54 by a spring 52 and to engage with the clutch 49, so that the shuttle will be revolved and the cam shaft will remain stationary. The winder-shaft 105 continues to revolve until a quantity of cotton has been wound sufficient to rotate the hook-shaped end 118 of a trip-lever 117 out of engagement with a pin 119, thereby disengaging the clutch 110 and stopping the winding-mechanism. The Provisional Specification states that the bobbins are extracted and reinserted by means of two cams mounted on the shaft and controlled by spiral springs. One of these cams is divided transversely. One portion is provided with a stop which engages slots in the shaft and can be turned by a handle through one third of a revolution.