Patent GB-685560-A (GB)
Title: Improvements in or relating to automatic reversing gearing
IPC: D06F37/30
Filed: 1950-03-07
Abstract: 685,560. Reversing-gearing; machinery safety devices. CHERRY TREE MACHINE CO., Ltd., and DOWELL, G. June 7, 1951 [March 7, 1950], No. 5668/50. Classes 80 (ii) and 80 (iv). In a reverse gearing, of the kind in which open and crossed belts are movable axially of two loose pulleys on a driven shaft so that one or the other belt may be engaged with a third pulley disposed between the loose pulleys, the third pulley is connected to the driven shaft through a friction clutch. In the embodiment shown in Fig. 1 a counter-shaft 13, which drives through V-ropes 12 the rotary drum 11 (Fig. 5) of a washing machine, has loosely mounted thereon pulleys 18, 19, 20 but the pulley 18 is keyed to a sleeve 38 attached to the driving member 39 of a friction clutch 40 the driven member 41 of which is keyed to the shaft 13. A clutch operating sleeve 42 is connected by levers 43, 47 and links 46, 49 to a manual control lever 50, Fig. 3. The lever 50 is also connected by a link 55 to the actuating lever 59 of a brake band 58 encircling a drum 57 on the shaft 13. In the control lever position shown in full lines in Fig. 3 the clutch is disengaged and the brake is on, the lever being biassed to this position, in which it may be retained by a latch 51 engaging a notch 52, by a spring 60. As the lever is moved to the position shown in broken lines, in which it may be retained by the latch 51 engaging a notch 52a, the brake is released and the clutch engaged. Belts 22, 23 rotate the loose pulleys 19, 20 in opposite directions. By means of an arm 37 on a rod 34, a belt shifting member 26 may be connected to, or disconnected from, a lever 28 reciprocated automatically by a worm and wheel 32, 29, a pin 30 and a cam 31. To disengage the arm 37 from the lever 28, the rod 34 is rotated by means of a handle 64a connected thereto by a link 65 and crank arm 66. The handle 64a is pivotally mounted in a clevis 63 carried by a rod 61 which is rotatable in brackets 62 and carries a crank arm 67 associated with a slider 68 on a member 69 rotatable but fixed axially relative to the rod 34. In the full-line position shown in Fig. 3, the handle 64a may be moved to rotate the shaft 61 and actuate the member 26. Lugs 72 are provided, on a quadrant plate 73 attached to the support 62, to co-operate with a latch 71 carried by the handle 64a and define forward, neutral and reverse positions of the driving belts. By manually depressing the latch 71 and rotating the handle 64a about its pivot, the arm 37 may be engaged with the lever 28, the reverse gear then operating automatically. To prevent a door 16 in the casing 10 of the machine from being opened when the machine is running and to ensure disengagement of the automatic reversing gear when that door is open, a .cam 74 on the door is arranged to operate a follower 76 on a lever 75. A lever 78 integral with the lever 75 carries a cam plate 80 arranged to abut the latch 71 and move the arm 37 out of engagement with the lever 28 on opening the door 16, the handle 64a, however, remaining free for manual reversing operation since the lugs 72 will not be engaged by the latch. A further lever 79 integral with lever 75 simultaneously moves a horn 84 on a bell crank 82 to obstruct the notch 52a making it impossible to leave the handle 50 in the running position. The handle may, however, be actuated to inch the drum 11 into such a position that a door 14 therein registers with the casing door 16. A pin 83 on the handle 50 obstructs one end of the lever 82, and hence the opening of the door 16, unless the handle is in the off position. To prevent inching of the drum when the door (or doors) 14 is opened, a lever 90, biassed by a weight 90a to the position shown, is pivotally mounted on a shaft 86 and has a V notch 91 co-operating with the pin 83. The door (or doors) 14 is arranged to contact a lever (or levers) 89 at the end of its opening movement to rotate the shaft 86 and lever 90. It is impossible to fully open the door 14 unless the handle 50 is in the off position.