Patent GB-662378-A (GB)
Title: Improvements in or relating to fabric take-up mechanisms
IPC: D04B27/34
Filed: 1949-07-20
Abstract: 662,378. Knitting-machines. BRITISH CELANESE, Ltd. July 20, 1949 [July 22, 1948], No. 19119/49. Class 74 (ii). To enable a tight uniform winding of the fabric to be obtained on the take-up roller 29 of a warp machine, the tension of the fabric between the feed roller 28 drawing the fabric from the needles and the take-up roller 29 is gradually increased from the commencement of taking-up the fabric on the take-up roller to when the take-up roller is partly full by a slipping clutch driving the take-up roller in which resistance to slip between two drive surfaces is gradually increased. The feed roller 28 is driven at one end through pawl-and-ratchet mechanism, operated by an eccentric plate mounted on the camshaft, to maintain a constant tension of the fabric as it is withdrawn from the needles. The other end of the feed roller 28 is supported by a shaft 82 which is mounted in a bearing in a frame support 34. The shaft 82 has a gearwheel 86 keyed to it which drives a gear-wheel 90 through an idler gear 88. The gear-wheel 90 is fixed to a shaft which has an eccentric stud 93 secured in its end and which engages in a slot 94 of a lever 95 pivoted to the end of the shaft 82. Rotation of the shaft by the gears 86, 88, 90 cause the eccentric stud 93 to oscillate the lever 95 and to cause a pawl 101 mounted on the lever to engage a ratchet of a rotatable cap 96. The rotatable cap 96 which is slidably mounted on the end of the shaft 82, is provided with a cam surface 116 which engages with a cam surface 117 of a ring 118, the two surfaces being retained in an abutting relationship by a helical spring 123 encircling the end of the shaft 82, one end engaging the cap 96 to urge it outwardly. The other end of the spring 123 engages a clutch disc 124 slidably keyed to the shaft 82 and urges it into engagement with a gear-wheel clutch disc 128 loosely mounted on the shaft 82. The gear-wheel clutch disc 128 drives a gear-wheel 131 keyed to a shaft 138 which is connected by a link 141 through universal couplings to a socket 147 adapted to engage and transmit the drive to the take-up roller 29. As the feed roller 28 rotates to draw the fabric from the needles of the machine and to drive the disc 124, the pawl-and-ratchet mechanism for the cap 96 rotates the cap, whereby the cam surface on the cap rotates with respect to the cam ring 118 and the surfaces being of the configuration shown in Fig. 11 urge the cap inwardly against the spring 123 which increases the pressure between the clutch disc 124 and the gear-wheel clutch disc 128. Such increase in pressure reduces the resistance to slip between the two surfaces of the discs whereby a more positive drive between the two discs is attained and, through the gear-wheel 131 and link 141, increases the tension of the fabric being taken by the take-up roller 29. To permit the tension of the fabric to remain constant until the take-up roller has been filled a number of blank portions 113 are left between groups of ratchet teeth, which portions the pawl 101 engages at the end of the motion of the cap for increasing the pressure between the two discs 124, 128. The take-up roller 29 rests on the feed roller 28 and the end of the take-up roller opposite to its driven end is supported by a similar socket to that at its driven end, this supporting socket being mounted in a bracket to enable the take-up roller to be readily detached from its mounting.