Patent GB-190809285-A (GB)
Title: Improvements in and relating to Power Looms having Freely Falling Lays or Lathes
Inventor: WINTERMAYR JOSEF
IPC: D03D41/00
Filed: 1908-04-29
Granted: 1909-01-21
Abstract: 9285. Wintermayer, J., and Lehmann, O. April 29. Loom beat - up motions ; stop - motions ; brake mechanism ; stopping and starting mechanism.-In wire-cloth and other looms with freely-falling lays, the lay-actuating shafts 5, Figs. 1 and 3, is provided with an electro-magnetic or other brake 12 or 12<1> or ratchet mechanism, which is thrown into operation to stop this shaft quickly when the electro-magnetic driving-clutch 2 or other driving- means is thrown out of action, either automatically or by hand. The main shaft 1 having the driving- clutch 2 drives an intermediate shaft 3, which may have a disk 8, Fig. 1, carrying rollers 7 actuating an arm on the shaft 5, so that the lay 11 is lifted by the arm 9 and connexion 10 and falls by gravity. The brake may be of the Siemens type of electromagnetic brake, the windings of the electro-magnets in the brake being so connected with the windings of the clutch 2 and a source of current that, on breaking the clutch circuit, the brake circuit is closed. A block, spring, or friction brake may be employed. In the arrangement shown in Fig. 3, the lay is lifted by bands 13, Fig. 3, secured to pulleys 14 on the shaft 5, which is provided with a brake 12<1> arranged as a clutch so as to serve for lifting the lay. The brake 12<1> consists of apart freely mounted on the shaft 5 and driven by a chain 15, and an axially movable part. The brake clutch 12<1> is periodically excited and the axially movable part is moved into and out of engagement with the rotating part by a rotating commutator on the shaft 3. The commutator consists of two adjustable contact-brushes 16, Fig. 12, connected to a source of current, and a rotating contact-piece 17. This periodical engagement of the brake clutch 12<1> is effected by a shunt circuit. During the time the clutch 12<1> is not excited, the lay is free to fall. By means of main circuit connexions, Fig. 12, the current is passed through the brake 12 or 12<1> and is interrupted from the driving-clutch, when the machine is stopped by band, or when it is stopped automatically owing to (a) absence of the shuttle from the shuttle box, (b) too great rearward motion of the lay, or (c) breakage of the warp. When the stopping-bar 18, Fig. 6, is moved by hand, an arm 20, shaft 21, and segment 22 are rocked by a link 19, and one of two projections 23 on the segment 22 engages and raises a weighted lever 24 provided with a slot 25, in which engages a pin 26 linked to the switch-bar 28. The lever 24 overbalances and quickly shifts the bar 28 carrying the switch 29, the current being switched from the contacts a, b, Figs. 6 and 12, to the contacts a, c. The current through the driving-clutch 2 is thus interrupted, and that through the brake 12 is closed. In the case of the automatic stoppage (a) referred to above, a weighted feeler 31, Fig. 3, pivoted on the lay is provided with a pawl 32, Figs. 3 and 12, which is normally held raised from a rack 34 by the engagement of the free end of the feeler with the shuttle in the box. If the shuttle is not boxed, the rack 34 is moved by the pawl against the action of a spring 35, and a pin 39 no longer supports a weighted lever 37, which then falls and moves a switch-bar 41 by means of a link 40, so that the current is switched from the contacts a', b<1>, Fig. 12, to the contacts a', c'. In the case of the automatic stoppage (b), if the lay swings too far back, a projection 44 thereon engages a buffer 43, which then rocks a lever 45 against spring action. A weighted lever is then allowed to fall and a switch bar 52, Fig. 12, is operated to switch the current from the contacts a<2>, b<2>. In the case of the automatic stoppage (c), when a warp breaks, an independent electric circuit is closed through one of the usual insulated bars 53, Fig. 3, a solenoid 54, Fig. 12, is excited and a switch - bar 58 carrying a switch 57 is moved by lever mechanism to switch the current from the contacts a<3>, b<3> to the contacts a<3>, c<3>. When the current is switched from the driving-clutch and the brake clutch 12<1> is energized, the inertia of the shafts 1, 2 causes a braking action, but the shaft 3 may be further provided with a ratchet-wheel with which a pawl engages to prevent the shaft 3 from turning owing to the action of the weight of the lay. A ratchet mechanism may be employed instead of the brake 12 or 12<1>, the shaft 5 being provided with a ratchet-wheel 60, Fig. 13, with which pawls 61 are caused by lever mechanism 66, 67, 68, 70 to engage when a solenoid 63, introduced into the circuit in the same manner as the brake 12 or 12<1>, is energized ; or the pawls may be arranged to drop into engagement, and thus give the required braking effect, by the action of their weight or a spring, when the solenoid 63 is no longer excited. In this case, however, the solenoid 63 and electro-magnetic driving-clutch are arranged in series.