Patent GB-247064-A (GB)
Title: Improvements in or relating to creel brake mechanism of machines for warping yarns
IPC: D02H13/00
Filed: 1925-06-10
Abstract: 247,064. Marks, E. C. R., (Barber-Colman Co.). June 10, 1925. Force-transmitting mechanism. - In creel brake mechanism of machines for warping yarns, means are provided for relieving the pressure of the brakes when the rotation of the yarn masses has been stopped, this arrangement preventing the cheeses from revolving too freely while the warp beams are being revolved slowly preparatory to shifting to high speed, means being also provided for withdrawing the brakes from such yarn tensioning or drag position and held in readiness for another stopping application to the yarn masses. The cheese brakes 45, Fig. 4, are mounted on shafts 46 provided with toothed segments 64 in gear with racks 63 by which the brakes are operated. The motion to each brake 45 is transmitted from its shaft 46 through a light spring 51, Fig. 6, which prevents over running and a heavier spring 54 which is brought into operation for stopping. The springs are mounted on a sleeve 47 pinned with flanges 49, 50 on the shaft 46. One end of the spring 51 engages the brake arm and the other is hooked to engage in notches in the flange 49, the torsion being adjusted by moving the hook forward in notches. The spring 51 normally holds a shoulder 52, Fig. 7, on the brake arm 45 against a stop shoulder 53 on the flange 49. The spring 54 has one end hooked to engage notches in the flange 50 the other end holding a lug 55 which is rotatable on the sleeve 47. The brake comes into operation when the side 60, Fig. 8, of the lug: engages the portion 61 of the brake arm 45. The racks 63 are mounted on bars 62 sliding in guides 69, Fig. 12, and the bars are connected to a horizontal rod 68, provided with anti-friction rollers at its ends, and raised and lowered by links 71 from crank arms 72 on a rock shaft 73 which is operated by an adjustable group of tension springs 75, Fig. 11, connected to an arm 74 on the. rock shaft. A dog 80, Fig. 13, bears at one end against the flattened surface or shoulder 86 on a pivot 87 carrying an arm 88, Fig. 11, and at the other is provided with a counterweight 83 which rests against a stop 84 on an arm 82 keyed to the shaft 73, and thus prevents rotation thereof. The application of the creel brakes is automatic and is effected by energizing an electromagnet 44 which raises an armature 99. Fig 18, rotates a shaft 90, and withdraws a finger 89, Fig. 11, from the arm 88. The pressure of the dog 80 against the surface 86 turns the pivot 87 to release the dog 80 whereupon the springs 75 acting through the arms 74 turn the shaft 73 and apply the brakes. A second electromagnet is provided which is normally energised, but releases its armature when the current fails, and allows a weighted lever to strike away the finger 89 and release the arm 88. The resetting of the brakes is effected by a wheel 144 driven through reduction gears from a belt pulley. A cam 145, Fig. 13, on the wheel 144 engages a stud 146 on the arm 82 and lifts the said arm. When in this lifted position a cam 147 on the wheel 144 engages a roller 148 on the arm and lifts the arm further to a dwell position 149 of the cam. In this position the pressure of the springs 54 is removed and the drag on the cheeses due to the springs 51 is sufficient to prevent rotation during repair of broken thread and replenishing of creels. When ready, the operative sets the warper to run at high speed, the wheel 144 resumes rotation and the cam 150 raises the arm 82 past the shoulder 86. The cam then leaves the roller 148 and the springs 75 cause the dog 80 to press against the shoulder 86 ready for the next brake operation. The belt engaging arm 155, Fig. 14, is operated by a cam 161 on the rock shaft 73 which engages a projection 162 on a belt-shifter member 156 and the shaft 73 is turned to apply the creel brakes and beam brake. A latch 163 pivoted at 164 and having a shoulder 165 engaging an arm 166 rigid to the shifter member 156 locks the belt on its light pulley and such latch is disengaged by a cam 168, Fig. 13, engaging the end of the latch 163 when the dwell 149 has reached the roller 148. A lifter, connected to the belt-shifter lever by links and levers lifts the weighted lever carrying the armature of the second electromagnet into contact with its electromagnet when the belt is shifted on to the fast pulley.