Patent GB-682770-A (GB)
Title: Improvements relating to garment and like presses
IPC: D06F71/10
Filed: 1949-04-19
Abstract: 682,770. Ironing presses. SIMPSON, J., and SIMPSON, jun. J., April 19, 1950. [April 19, 1949] No. 10363/49. Class 138 (ii). [Also in Group XXIV] In a garment or like press comprising a horizontally rotatable carrier 3 with two tables 8 which can be brought in turn into the pressing position, fluid pressure is communicated both to a vertically movable ram 6 for the tables and to carrier turning means through the same control valve 13 which is moved to one position to initiate the cycle and is moved to another position automatically in dependence on the position of the carrier to complete the cycle. The press comprises a press head 2 mounted on a base 1 which houses a cylinder 4 for the piston 5 of the ram 6. The tables 8 are vertically slidably mounted on stems 10 in arms 9 of the carrier 3. An externally toothed ring 12 is connected to the carrier 3 which is supported by a bearing structure 11 projecting from the base 1. The control valve 13 comprises a piston valve (Fig. 3) having heads 16, 18 and 20. A port 22 in the valve wall is permanently connected with an air pressure supply pipe 23. In the L.H. end position. of the valve shown in Fig. 3 pressure is communicated to the cylinder 4 through a ring of ports 24, an annular passage 24<SP>1</SP> and a duct 24<SP>2</SP>. In the R.H. end position the cylinder 4 is connected to atmosphere through exhaust ports 25 and silencers 26. Communication of pressure to chambers 27, 28 at the ends of the valve through ports 29, 30 is controlled by a pedal operated valve 14 and a carrier-influenced valve 15 respectively. A port 31. communicating with a carrier turning cylinder 32 by a pipe 33 (Fig. 2) is connected to pressure through port 29 in the R.H. end position and to exhaust through ports 25 in the L.H. end position. Finally, a port 34, controlled by the head 16, communicates through a pipe 35 with the cylinder 36 of a clutch-disengaging device. A head 37 on the valve co-acts with a resilient pad 37<SP>1</SP> which quietly arrests movement of the valve to the left. The pedal operated valve 14 is a piston valve (Figs. 1 and 2) with two heads 38 and loaded by a spring 39. A port 40 communicates with the L.H. end of the valve 13 and with the valve 15 through a pipe 41 and chamber 42 having branch connections 43, 44. When the pedal 47 is depressed the port 40 is put in communication with a port 45 connected by a pipe 46 to the air supply pipe 23. In the other position of the pedal the port 40 is connected to an exhaust port 48. The pedal 47 is coupled to the rod 49 of the valve by a link 50 which passes through a dead-centre position so that the pedal is held in its depressed position by the spring 39. Means for automatically tripping the pedal 47 comprises a cylinder and piston (Fig. 4, not shown) supplied with air through a pipe 53. The carrier influenced valve 15 (Fig. 3) comprises a slidable upper portion 54 and lower portion 56. Air from the pipe 44 enters the valve through a port 58 and urges the valve upwardly against the resistance of a compression spring 60 (Fig. 1) acting on an adjustable push rod 61 which bears on a head 62 of the valve. The ring of ports 30 opens into an annular passage 63. Exhaust ports 64 are provided. The push rod 61 and therefore the valve are normally held down by means of a rocker 65 which is rotatable about a vertical pivot 66. The rocker 65 carries a block 70 which is engageable by the hardened end 71 of an adjustable finger 72 carried by a bracket 73 at the end of each arm 9 of the carrier. The arrangement is such that as a table 8 becomes correctly located over the ram 6 the finger 72 causes the rocker 65 to turn sufficiently to be disengaged from the rod 61 which thus allows the valve 15 to rise. The ports 30 are thus opened to the space 59 and pressure can be communicated to chamber 28 under the control of the valve 14. The block 70 is mounted on springs, Fig. 6 (not shown), so that directly the rocker has been moved to release the valve 15, it moves out of the way to let the finger 72 snap past. The carrier-turning cylinder 32 has a plunger 76 formed with a rack 77 which meshes with a pinion 78, Fig. 7 (not shown). A dog clutch 90, 91 (see Group XXIV) for making a driving connection between the pinion 78 and a toothed wheel 79 meshing with the ring 12 of the carrier is operated by a piston 80. This piston also serves as a valve to control the communication of pressure to a return cylinder 81 by uncovering a port 82 leading thereto through a pipe 83. A piston 84 in the return cylinder has a rack 85 meshing with the pinion 78 and controls the communication of pressure through the pipe 53 to the pedal return cylinder by uncovering a port 86. The dog clutch is arranged so that the dog member is always returned to the correct engaging position after each half turn, wherever the carrier 3 may stop in relation to the ram 6. Operation. When the carrier 3 is at rest the parts are in the positions shown in Figs. 1, 2 and 3. The pedal 47 is now depressed to supply pressure to the chamber 27 of the control valve 13 and to the chamber 59 of the carrierinfluenced valve 15. The valve 15 is held down by the rocker 65 and the control valve is moved to the right, thus connecting the ram cylinder 4 to exhaust and then the cylinder 32 to the supply. The ram 6 and table 8 sink and the carrier is turned through 180 degrees by a drive transmitted from the plunger 76, through the rack 77, pinion 78, shaft 89, clutch 90, 91 and gearing 79, 12. The motion is retarded by a dash-pot 99 (Fig. 2) and as the other table 8 comes to rest in position over the ram 6, the rocker 65 is tripped by the finger 72 and the valve 15 rises. Pressure is thus communicated to the chamber 28 and moves the control valve 13 to the left, as the head 16 is larger than the head 18. Cylinder 32 is cut off from the supply and connected to exhaust, and pressure is communicated to the cylinder 4 to raise the ram 6 and the table. Pressure is also communicated to the clutch cylinder 36 whose piston 80, in rising to release the clutch 90, 91 allows pressure to pass to the return cylinder 81. The piston 84 drives the pinion 78 reversely through the rack 85 thereby returning the piston 76 and clutch part 90 to their initial positions. At the end of its stroke the piston 84 causes pressure to pass to the pedal return cylinder (not shown) via port 86 and pipe 53. The pedal 47 and valve 14 are returned to their original positions and the chambers 27, 28 and 59 connected to exhaust through the port 48. The valve 15 is again depressed by the spring 60, leaving the chamber 28 connected to exhaust and freeing the rocker 65 to be returned by a spring to the valve engaging position.. The whole press is then ready for a fresh cycle of operations by depressing the pedal 47. Specifications 643,270 and 643,285 are referred to.