Patent GB-643285-A (GB)
Title: Improvements relating to garment and like presses
IPC: D06F71/06
Filed: 1946-11-01
Abstract: 643,285. Ironing-presses. SIMPSON, J., SIMPSON, jun., J., and ODELL, G. Nov. 1, 1946, No. 9335/47. Divided out of 32530/46. [Class 138 (ii)] [Also in Group XXXII] Relates to ironing-presses of the kind comprising a horizontally-rotatable carrier 11, Fig. 1, with two tables 8 which can be brought in turn into pressing position According to the invention, the carrier is arranged to be turned always in the same direction of rotation by means operated by fluidpressure, and the cycle of each individual pressing operation is adapted to be separately initiated and automatically completed in response to a single action by the operator, such action consisting in the same operation of a single control device for each cycle. As shown, each table 8 is brought in turn to a position below a fixed press head 6, and then raised by a verticallymoving ram 4 so as to press an article. The tables 8, which are each provided with a railed platform 9, are carried at the ends of opposed radial arms 10 on the carrier and are mounted upon plungers 12 slidable in the arms 10, additional guided plungers 14 being provided to steady the tables. The arms 10 project from a hub 15 which has a toothed ring 18 engaging a toothed wheel 19, Fig. 4, carried by a sleeve 20 in a bearing 21. A member 26, which is slidable axially in the sleeve, carries a pinion 32 meshing with a rack 33 on one side of a plunger 34 working in a cylinder 35. The member 26 is adapted to be pressed upwardly by a cam 30 so that clutch members 23, 24 are engaged and the pinion 32 is clutched to the toothed wheel 19. The clutch members 23, 24 are engaged by means of a pedal lever 59, which is connected through links 56, 58, 70, Fig. 1, and a bellcrank 57 with an arm 71 on the cam-shaft. On the side opposite to the rack 33, the pinion 32 meshes with a rack 40, Fig. 2, formed on a plunger 41 working in a cylinder 42. The cylinder 35 is controlled by a valve 46, Fig. 1, which is constantly connected with a source of pressure through a port 72 so that, unless the ram 4 is in raised position, pressure is communicated through the valve outlet 75 to the inlet port of the cylinder 35 ; in the raised position of the ram, a roller 77, Fig. 1, on the ram acts through a lever 80 to depress a piston 76 in the valve 46 so as to connect the cylinder 35 to exhaust. The cylinder 42 receives pressure from the cylinder 2 when the piston 3 therein is in its upper position. The rotation of the carrier 11 is controlled by a dashpot (see Group XXXII) comprising a plunger 86, Fig. 4, which is coupled to the plunger 34 with a considerable degree of lost motion and works in a cylinder 87 coaxial with the cylinder; an oil reservoir 92 communicates with the cylinder 87 through two staggered ports 88, 89 controlled by needle valves 90, 91 and a passage 94 provided with a non-return valve 95. Pressure is supplied to the cylinder 2 for the operation of the ram under the control of a valve 45, the piston 50 of which is moved to its inner position in which the cylinder is connected to exhaust by the pedal lever 59 acting through the bell-crank 57 and links 56, 58; this movement is assisted by the action of a piston 63 working in a counterbalancing cylinder 61. The piston 50 is prevented from moving to supply position except when a table 8 is correctly placed over the ram 4 by means of a rocking-lever 65, Fig. 2, which is pivoted to the rod 64 and only permits outward movement of the piston when a roller 6 on the lever engages one of a pair of slots 69 in a flange 68 on the hub 15. Controls.-A cut-off valve 44, Fig. 1, comprises a piston which is normally held by fluid pressure from a connection 44<SP>2</SP> in a position to allow pressure to be transmitted through a connection 44<SP>3</SP> to the cylinder 35. When the piston is moved to cut off pressure by a pushrod and cam 47<SP>1</SP> actuated by a pedal 48, the cylinder 35 is connected to exhaust. The pedal 48, arm 471 and push-rod may be mounted on the pedal lever 59. The valve 44 may be disposed between the valve 46 and cylinder 35 or in the main pressure supply to the machine. In operation, depression of the pedal lever 59 causes (a) the valve 45 to connect the ram cylinder to exhaust so that the table 8 then in pressing position is lowered, and the return cylinder 42 is connected to exhaust, and (b) the roller 67 to be withdrawn from the slot 69 and the cam 30 to effect engagement of the clutch 23, 24. The descent of the ram permits the valve 46 to connect the cylinder 35 to pressure whereby the carrier 11 is rotated through 180 degrees. Towards the end of this movement, the dashpot 86 stops the carrier with the second table in position over the ram 4, at which time the roller 67 moves into a second slot 69 so as to permit operation of the valve 45 and raising of the ram. As the ram rises, pressure passes to the return cylinder 42 whereby the plunger 41 thereof acts through racks 33, 40 and pinion 32 to withdraw the plungers 34, 86. The tables 8 may be heated by means as described in Specification 643,270. The Provisional Specification describes also the rotation of the carrier by a sector which, when the ram-control valve is moved to exhaust, is rocked vertically into engagement with the toothed ring on the corner by cam-and-lever mechanism connected with the piston of the valve; the ram, in descending, then operates a valve to supply pressure to a cylinder so that the piston thereof drives the 'sector.