Patent GB-1154827-A (GB)
Title: An apparatus for Automatically Positioning in a Fringe Machine an Unwoven Warp-Thread Section of a Fabric to be Fringed
Inventor: BATTISTA GIOVANNI
IPC: D04D5/00
Filed: 1967-11-15
Abstract: 1,154,827. Fringeing-machines. S.M.I.T. SOCIETA MACCHINE PER. l'INDUSTRIA TESSILE SOCIETA PER AZIONI. 15 Nov., 1967 [15 Nov., 1966], No. 52092/67. Heading D1S. A device for positioning in a fringeing machine an unwoven warp-thread section of a fabric to be fringed comprises first means for bringing the advancing fabric to a rest position in which the section is centred on a weft-wise centre line of the machine and means for slowing down the fabric as it approaches this rest position. In one embodiment, Fig. 1, the fabric to be fringed rotates an idling cylinder 3 covered by a rough sleeve and which rotates, through a universal joint 2, a gear I which transmits motion, 'reduced by a gear 4, to a shaft 5 having a gear 6 keyed thereto. Gears 6, 10 are rigidly connected to the input shafts of two electromagnetic toothed clutches 8, 9 to the output shafts of which there is secured a shaft 7 on which the gear 10 is freely rotatable. Gears 11, 12 are keyed to a shaft 13 and a gear 14 is keyed to a shaft 15. The gear ratio is 2:1 for the pair 6, 11 and is 1:1 for the train 10, 12, 14. When the clutch 8 is excited by a feeler (not shown), arranged to detect the leading edge of the advancing section and at a distance from this line at least equal to the maximum section length, a disc cam 16, keyed to the shaft 7, is rotated at the same speed as and in the same direction as the shaft 5. When the feeler detects the trailing edge of the section the clutch 8 is released and the cam 16 is thus stopped after having rotated through an angle directly proportional to the length of the section. The clutch 9 is excited when the leading edge of the section reaches a second feeler (not shown) on the centre line of the machine so that the cam 16 turns with the gear 10 in the opposite direction to and at twice the speed of the shaft 5 and reaches its initial position when the centre line of the section coincides with the centre line of the machine. When this initial position has been reached the cam 16 actuates a microswitch 17 to operate a slide valve to stop a hydraulic motor for advancing the article. To slow the advance of the fabric during the last few centimetres of its travel, a continuously adjustable slide valve (not shown) is provided in the oil flow path of the hydraulic motor to' throttle the feeding flow and reduce the motor speed and is controlled by a microswitch 18 arranged a few degrees in advance of the microswitch 17. The microswitches 17, 18 are normally isolated and activated only during the reverse phase of the cam 16. In a second embodiment, Fig. 2, the gearing of Fig. 1 is replaced by a large friction wheel 19 having a co-axial annular recess and the cam (not shown) is driven by a shaft 22 having a small friction wheel 23 fixed thereto. The diameter of the outer peripheral surface of the recess is twice that of the inner surface and, the wheel 23 engages the inner surface when the first feeler is actuated and the outer surface when the second feeler is actuated. In a further embodiment (not shown), the hydraulic motor is replaced by a d.c. motor. The microswitch 17, on actuation by the cam, switches off the motor and simultaneously applied a stopping brake and the microswitch 18 reduces the speed of the motor by connecting a resistance in series with the motor supply circuit.