Patent GB-170028-A (GB)
Title: Improvements in type casting machines
IPC: B41B5/06
Filed: 1920-05-03
Abstract: 170,028. Williams, V. S., and Williams Engineering Co., Ltd. May 3, 1920. Type-casting machines ; moulds ; metal pots and pumps ; trimming type. -Relates to machines in which the mould parts are separated to permit of ejection of the type, and particularly to (1) means for operating the mould parts and the matrix, (2) means for ejecting the tang from the mould, (3) metal-pump mechanism, and (4) means for producing a variable dwell or interval between the introduction of the metal and the ejection of the type. The description is substantially identical with that of Specification 170,027 but the claims are different. (1) According to the invention, the upper mould-block is adapted to be turned about its longitudinal axis to facilitate inspection &c. In the arrangement described, the mould carrier 1, Fig. 2, slides on a fixed dovetailed guide 2, and is moved to and from the metal-pot by a bell-crank lever and a cam. The end of the lever is engaged between pads 11, 12, Fig. 5, on the mould-carrier, one pad being supported by a spring arranged in a screwed bush 14, so that the pressure of the mould-carrier against the metal-pot can be varied. The matrix 20 is carried by a sliding member 19, which is operated by a lever 18 pivoted on the mould-carrier, the lower end of the lever being connected by a spring 22 to a fixed point so that the movement of the mouldcarrier advances and retracts the matrix. The member 19 is internally threaded to receive a threaded rod 24 to which the matrix is attached, a. second threaded rod 25 serving to lock the rod 24 in adjusted position. The block 26, Fig. 1, carrying the upper half of the mould has a prolongation 27 of circular cross section which is clamped in one arm of an L-shaped member 28, so that the block can be adjusted longitudinally and also turned about its longitudinal axis for inspection &c. The member 28 is pivoted in a bracket 31 on the mould-carrier, and is connected by a link 35 to a lever 36 pivoted on the mouldcarrier, the end of the lever being connected to the machine frame so as to form a toggle arrangement by which the mould is opened and closed as the mould-carrier slides. The upper mouldblock is held down during casting by an abutment comprising a. screw 44 mounted in a fixed bracket 45 and carrying a ball 42 which bears upon a bevelled surface or a hardened plate on the mould block. The block 26 is provided with passages for water-circulation. (2) The tang is ejected from the break parts of the mould by a knife 48 pivoted on the mould-carrier and connected to the mould-opening mechanism. (3) The pump is operated by a cam on which rests a roller 53, Fig. 6, carried by a slide 54, having a socket to receive the spherical end of a rod 58 which is depressed by a spring 62. To avoid stresses in the rod 58, it is guided by means of a spherical portion 63 engaged in a tubular member 64 which slides in a guide 61. The rod 58 is connected by a yoke-piece. 65 guided on a pin 66 with a screwed sleeve 67 on a rod 68 which is secured to the pump-piston 70. The, piston may be engaged by means of screw-threads with a normally fixed sleeve 71 whereby the piston area is increased. The pump-nozzle is controlled by a jobber which is closed by a spring and is opened by the pressure of the metal on a piston face formed on the jobber. (4) The cam-shaft 87. Fig. 8, of the machine carries a toothed wheel 88 gearing with a pinion 90 which is loosely mounted on a rotating driving-shaft 91 carrying two sliding clutch-members 95, 97. The clutchmember 95, which is operated by a lever 96, serves for operating the machine continuously- The clutch-.member 97, which is arranged to be disengaged at intervals in order to produce a variable dwell in the operation of the machine is attached to a sliding sleeve 98 which can be retracted by a lever 102 and a spring 103. The clutch is held in gear by a block 104 which engages a groove in the sleeve 98 and is carried by a lever 106. The block is raised, to permit the clutch to open, by a boss 112 on the wheel 88 which engages a finger 113 connected to the lever 106. The retraction of the sleeve 98 by the lever 102 withdraws the finger 113 and permits the block 104 to fall into engagement with a screw-thread on the sleeve 98, so that the sleeve is fed to the right and the clutch is re-engaged after an interval. Means is provided for varying the point at which the block 104 engages the screw-thread and, consequently, the length of the interval. The block 104 is held out of action when the machine is to be continuously driven. Specifications 170,027 and 174,650 are referred to. The Provisional Specification describes also: -(1) A tang-ejector sliding in guides on the mould-carrier, and operated bv a spring and retracted by a fixed cam. (2) Means for securing a variable dwell in the operation of the machine comprising a number of toothed wheels, one or more of which are multitated, mounted on a driving shaft and gearing with pinions, which are loosely mounted on a driven shaft and are adapted to be connected therewith by clutchmembers. (3) The use of a change-speed device such as cone-pulleys, to vary the speed of the machine. (4) A metal-pump having an inlet or inlets, extending to an annular groove in thecylinder to ensure a rapid admission of metal.