Patent GB-366977-A (GB)
Title: Automatic reversing gear for jiggers in machines for dyeing tissues in piece
IPC: D06B3/32
Filed: 1930-11-10
Abstract: Reversing mechanism for dye-jigs comprise actuating means associated with the tissue beams which alternately bring into action a change-over device which, working through a suitable kinematic chain, releases a toothed rim associated with a planetary system and locks another toothed rim, so as to cause one of the gear wheels actuating the corresponding tissue beams to revolve in the desired direction while the other gear wheel is braked and <PICT:0366977/IV/1> <PICT:0366977/IV/2> <PICT:0366977/IV/3> <PICT:0366977/IV/4> stopped. A cable 61 wound round each tissue beam a, a<1> and the dye-bath rollers independently of the cloth actuates the device by releasing an arm 60 on the unwinding beam when the desired length of cloth has passed through the bath.  The arm 60 is pivoted at 59 and is formed with a collar embracing a sleeve 62 and holding it against the action of a spring 63 until the arm ceases to be intercepted by the cable 61.  On release the arm 60 allows a polygonal cam 51 to move axially along the axle 50 of one or other of the beams a, a<1> so as to engage with a roller 52, and thus to push back an arm 53 which acts elastically through a spring 57 on another arm 55 fixed to one axle 56 of the reversing device D.  The latter comprises a lever 65 which receives a continuous oscillatory movement through an eccentric pin 71 carried by a toothed wheel 70 which is rotated by means of a pinion 69, driven by a shaft 37, the pin 71 threading a block 72 sliding in a slot 73 in the lever.  When one of two pawls 64 is depressed by the rotation of its corresponding axle 56, the tip of this pawl engages the tip 75 of the lever 65 and acts as a fulcrum, so that the end 66 of the lever is forced to move along the path 76 to a new position, about which the lever then oscillates until again reversed.  The motion of the end 66 of the lever to its new position causes a toothed quadrant 68 connected thereto to move round, raising or lowering a rack 18a which engages with a pinion 19 and in this way brings about the axial displacement of an arm 21 which operates a characteristic reversing transmission T through levers 23, 24 connected thereto. The lever 24, which is partly semicircular, rocks about a diametral axis causing eccentric pins 29 mounted thereon to displace a friction ring 30 axially towards one or other of two interacting toothed rims 31, 32.  In one case satellite pinions 33 are set revolving, in the other case satellites 34 are set revolving in the opposite direction, while the other rim remains loose in each case, and the planetary system corresponding thereto is at rest.  One or other of two differential planetary systems 35, 36 is consequently caused to revolve in one direction or the other by means of the spindle 37 which is driven by a motor pulley, or other device.  The outer gear wheels 2, 2<1> of the planetary systems 35, 36 are externally toothed, and engage with toothed wheels fast with the ends of the beams a, a<1>.  While the motion of the lever 24 sets one of the gear wheels 2, 2<1> in motion, the lever 23 acting through an arm 45 presses a ring 39 against the other gear wheel, and as sets of pins 38 are loosely inserted in sets of holes in the gear wheels, the pins being longer than the holes, this causes the other gear wheel to be braked and stopped.  A device is also provided for stopping the reversing mechanism after a definite number of reversals.  This comprises a pawl 79 pivotally connected to the oscillating system 65. To each complete oscillation of the lever 65 there corresponds a forward stroke of the pawl 79, and a resultant displacement by one tooth of a ratchet wheel 77 which engages therewith.  Each complete revolution of the wheel 77 causes an inwardly inclined portion 80<11> formed in a groove 80<1> therein to allow the inward displacement of the tooth a spring-actuated cam, another portion of which is thus brought underneath a shoulder 86 of the left-hand pawl 64.  This left-hand pawl 64 is loose on its axle 56, but its tip is normally moved into and out of engagement with the tip 75 of the lever 65 by the action of another pawl 87 which is fast on the axle 56 and fits in a slot in the pawl 64, a spring 91<1> fastened to the pawl 87 communicating the downward movement thereof to the pawl 64, the upward movement of the pawl 87 also causing the pawl 64 to move upward because of its engagement with a shoulder 64<111> thereon. When the shoulder 86 of the pawl 64 is prevented from downward movement as described above, the pawl 87 only is depressed, and the tip 75 of the lever 65 engaging with this latter pawl causes the lever 65 to move so that the fulcrum 66 finally comes to rest in the midway position, so that the tip 75 oscillates out of reach of either of the pawls 64 and the mechanism is stopped.