Patent GB-797347-A (GB)
Title: A stop motion device for knitting machines
IPC: D04B35/10
Filed: 1954-10-06
Abstract: 797,347. Knitting-machines. ZAPADOMORAVSKE STROJIRNY, NARODNI PODNIK. Oct. 6, 1954 [Oct. 6, 1953], No. 28802/54. Class 74 (2). A stop-motion device for straight-bar machines comprises means detecting continuity and correct tensioning of the yarn and controlling actuating means, which actuating means, in the event of failure of, or excess tension in the yarn, intervenes to deflect the needle bar away from the presser edge, or to do that and to stop the machine, the detecting and actuating means being constituted by mechanical mechanisms and the deflection of the needle bar from the presser edge being smaller during knitting of the welt than during knitting of the remaining part of a blank. Yarn from each supply spool passes through a gap between an adjustable member and a stationary grid 14, and thence between the grid and a pivoted dropper 15, and through an eye of a pivoted yarn feeler 25. If the yarn tension is increased by a badly wound bobbin, or by a slub being caught in the gap, the feeler is deflected and a bent arm thereof presses against a lever 18, to bring a lever 54 into the position of Fig. 8. A needle 59 is thus lifted in its guide 62, until its upper end projects into the path of a cam 168 on a shaft 167 which, after the laying of each course, is swung clockwise (in the Figure) and the guide member 60 is thus swung in the opposite direction. The resultant rotation of a shaft 61 acts, through linkwork, to swing a shaft 71, Fig. 12, and hence, through lever 70, pin 77 and lever 78, to open a switch 81 and stop the machine. Whilst the welt is being knitted, a cam 136, Fig. 15, on a drum 133, holds a lever 129 in the position shown. Rotation of the shaft 71 at that time, rocks a lever 85 to release one end 88 of a lever 89 and allow its other end to engage a stop 109 on a lever 111, to cause that lever 111 to rock about a pivot 114 into a position determined by engagement of a nose 131 on the stop 109 with a bent end of the lever 129. Simultaneously, a pin 118 on a lever 119 is disengaged from a recess 115 and, in consequence, the needle bar 2 is given a small displacement away from the presser into a position in which the presser cam 98 is ineffective. This slight displacement prevents undesirable dropping of the loops of the first course from the welt hooks and damage to the needles from those hooks. After the machine has stopped, the needles may be further displaced, by means of the handle on lever 111, and facilitate access to them. When the welt is complete, the follower 137 drops off cam 136 on to the surface of drums 133. The lever 129 is thus tilted further, to remove its bent end. from the path of the nose 131 of the stop 129. Accordingly, the end 108 of lever 89 can, by action on the stop 109, deflect lever 111 into a position determined by engagement of pin 118 in a recess 117 of lever 111, resulting in a displacement of the needle bar greater than that occurring during well formation. If the yarn supply fails, the dropper 15 rotates about its - pivot 16 and deflects the lever 18, to set in train those of the above series of operations appropriate to the knitting of the welt or the remainder of the blank. Reference has been directed by the Comptroller to Specification 623,376.