Patent GB-758295-A (GB)
Title: Machine for assembling resilient bushings
IPC: B25B27/28
Filed: 1954-07-26
Abstract: 758,295. Assembling resilient bushings. GENERAL TIRE & RUBBER CO. July 26, 1954 [July 28, 1953], No. 21772/54. Class 108 (3). The invention relates to a machine for assembling resilient tubular bushings of the type comprising a tubular rubber insert A under radial compression between an inner tubular core C, and an outer tubular sleeve B. According to the invention, the machine comprises a pair of opposed pressing members 3, 4, one (3) of which is a sleeve-holding member, and has a sleeve-receiving socket 9, the other member (4) being an insert holding member and having an insert receiving socket 10, the member 4 having a bore 8 in which a core inserting plunger 19 is slidable, and an opening 18 through which a core C may be entered in the bore, means for moving one of the members 3, 4, toward the other to force an insert A into a sleeve B, and means for actuating the plunger 19 to force a core C into the insert A, thus positioned in the sleeve. The plunger 19 is operated and retracted by the action of a crank-shaft 25 connected by a one-revolution clutch 34 coupled to a continuously-rotating pulley-wheel 35. The clutch 34 is tripped by the energization of a solenoid 38. Co-operating with the sleevereceiving socket 9 is a sleeve-supporting member 12 carried by pistons 13 outwardly-urged from pneumatic cylinders 14. Similarly co-operating with the insert receiving socket 10 is a supporting member 15 carried by pistons 16 outwardly urged from pneumatic cylinders 17. Auxiliary supporting members 55, 55, and 58, 58, are carried by slides 51, 51 (Fig. 8), which may be projected inwardly to an operative position (Figs. 6 and 8), from an inoperative position (Fig. 1), by the action of pressure fluid supplied to cylinders 52, 52. The members 55, 55 carry projections 56, 57, which engage and additionally support the insert A. The members 58, 58 carry projections 59 which engage and support a flange b of the sleeve B. A pin 60 can be projected through the insert A by the action of pressure fluid in a cylinder 62 when the insert is in position as shown in Fig. 6. Control fingers 76, 77, (Fig. 3), are projected and retracted respectively, and vice versa, by the action of a solenoid 85 to control the feed of cores C in a shoot 75 above the opening 18. Similar control fingers actuated by the same solenoid 85, control the supply of inserts A from a shoot 74, and sleeves B from a shoot 73. The pressing member 4 can be projected towards the member 3 by the action of a piston 5 and pressure fluid in a cylinder 6. Lubricating liquid is supplied by a flexible pipe 68 to the interior of the plunger 19, and issues from an annular gap 65 adjacent its tapered end 21. Operation.-From the position of Fig. 1, the slides 51 are moved inwardly. The solenoid 85 is energized to release a core C into the opening 18, an insert A on to the supporting member 15 and the auxiliary supporting members 55, 55, and a sleeve B on to the supporting member 12 and the auxiliary supporting members 58, 58. (The parts are now as shown in Fig. 6.) The aligning pin 60 is then projected into engagement with the insert A, and the slides 51, 51 are retracted. The piston 5 then drives the pressing member 4 towards the member 3 and this results in the insert A being projected into the sleeve B. As the supporting members 12, 15 come into abutment, their pistons are retracted into their respective pneumatic cylinders, the insert A and sleeve B thereby being seated in their respective sockets 10, 9. The solenoid 38 is then energized to release the clutch 34 which results in the plunger 19 projecting the core C into the nowassembled insert A and sleeve B. On retraction of the member 4, an ejector latch 70 (which on the outward stroke sprang into engagement with the flange b of the sleeve B) drags the assembled mounting out of engagement from the socket 9 (Fig. 12, not shown). When the sleeve is in position in the socket 9 it opens a switch 121 by engagement with a spring-loaded plunger 122. The switch 121 is in the circuit (Fig. 15) of the solenoids 38 and 85, and thus prevents their energization and consequent projection of the plunger 19 and feed of a further insert A, sleeve B, and core C, should the ejector latch 70 fail to function. The connections of pressure fluid and exhaust to the respective ends of each cylinder 52, cylinders 6 and cylinder 62, are controlled by respective valves 94, 89, and 99, connected to a main pressure fluid line 87. These valves are operated by solenoids 98, 93 and 103, connected to a power line through rotary switches 110, 116 and 114, forming part of a timing mechanism driven by a motor 107. Also forming part of this mechanism are switches 112, 118 and 120, in the respective circuits of the solenoids 85 and 38, and a solenoid 105 which controls a valve which supplies lubricant from a line 88 to the flexible connection 68 leading to the interior of the plunger 19.