Patent GB-693708-A (GB)
Title: Improvements relating to warping machines for textile threads
Inventor: ROBERTSON ANDREW
IPC: D02H13/00
Filed: 1950-10-09
Abstract: 693,708. Warping machines. F.N.F., Ltd. Oct. 8, 1951 [Oct. 9, 1950], No. 24626/50. Class 142(iv) In a warping machine the height of the warp beam is adjusted during winding so that the warp always passes through the comb at the same height, the speed of rotation of the beam is decreased as the diameter of the warp on the beam increases, so as to keep the rate of winding constant, and the braking force applied on stopping the beam is proportional to the inertia of the beam. and the warp wound thereon. The warp threads, drawn from a conventional creel are taken between guide bars 19, 20, through a comb 25, between tension rollers 21, 22, 23, through the droppers 25A of a conventional stop motion, over a deflector rod 164, through a comb 27 to the warp beam 1. The warp beam is mounted horizontally on spindles 2, 3, spindle 2 being provided with manually operable means for adjusting it axially and being driven by a variable speed electric motor. Tension roller 21 drives a speedometer 24, the pointer of which, when it reaches a hand-set pointer, closes a circuit which acts to reduce the speed of the motor to keep the yarn speed substantially constant. The spindles 2, 3 are carried by arms 4, 5 having hubs 7, 8 pivoted on the base of the machine. The arms have casings 9 for trunnions engaged by screw jacks 10 driven by gearing in the feet 11 so as to raise and lower the arms. To prevent the jacks 10 being driven too far in either direction adjustable stops are provided operating microswitches to stop the motor driving the jacks. The arms may be lowered to insert a warp beam, then raised to the working position, in which position the height of arms can be controlled automatically. A yardage counter 29 is driven by a pulley round which a number of warp threads are taken. The counter is mounted on a bracket 126 which also carries the beam height control 28 having a feeler 128 which closes a circuit, on the warp rising sufficiently, to energise a motor driving the jacks 10, thus lowering beam 1 slightly to keep the height of the warp passing through comb 27 substantially constant. A rod 167 mounted close to comb 27 prevents the warp rising above the comb if the height control fails. Each spindle 2, 3 is provided with a brake of the internally expanding type, which is normally held in the off position by electro-magnetic means. The brake is operated by the release of a spring loaded arm, a plunger 75 moving over a cam face 76, as the height of arms 4, 5 is varied, to vary the compression of the spring and hence the braking force applied to the spindle. A cam-shaped member is provided on a guard rail 145 actuating switches such that on moving the rail to the right, as seen in Fig. 4, the motor driving spindle 2 is started, while moving the rail to the left stops the whole machine. If the guard rail be raised to give access to the beam the machine is stopped and can only be restarted when the rail is returned to its former position. Tension roller 22 is mounted on pivoted arms 84 so that it can be swung clear of the warp threads for threading up, and can be set in its working position at different heights. Rollers 21, 22, 23 drive a belt, the tension of which may be adjusted by jockey pulleys, driving a pair of brake drums. One brake drum is continuously braked to give the desired tension to the warp threads; electro-magnetic means enable the other brake to be applied on stopping the machine. A gumming bar 162 is provided enabling gummed paper to be attached to the end of the warp to keep the warp ends separate on the completion of winding. According to the Provisional Specification cams are provided bearing on the spindles 2, 3 so that if they tend to become unscrewed during winding a circuit is broken which acts to stop the machine.