Patent GB-551161-A (GB)
Title: Improvements in or relating to typographical slug casting machines
IPC: B41B7/16
Filed: 1941-07-08
Abstract: 551,161. Type-bar-making machines. TURNER, H. K. (Mergenthaler Linotype Co.). July 8, 1941, No. 8622. [A Specification was laid open to inspection under Sect. 91 of the Acts, March 6, 1942.] [Class 100 (iii)] Moulds: driving-mechanism.-The machine is equipped with a horizontally adjustable mouldmagazine L, Fig. 3, containing a number of moulds A placed in vertical pockets, any one of which can be brought beneath a rotatable mould-holder B for transfer of a mould thereto. (1) The mould-holder comprises spaced side-portions B<SP>3</SP>, B<SP>4</SP>, Figs. 26 and 27, carried at their upper ends by a rock-shaft B' and connected together at their lower ends by an offset portion B<SP>5</SP>, so that a mould can be slid into and out of the holder. Each mould consists of base and cap portions Al, A2 separated by liners A3, A4 and secured together by screws. End-plates A7, A8 are also secured to the mould, and are adapted to slide in grooves in the mould-holder, which are also engaged by tongues on the base and cap of the mould. The mould is located endwise in the holder by a stop X and a spring buffer X2, and is retained by a latch B8 and by cams B14, which clamp it against one side of the holder. The mould-holder is swung from the vertical ejecting position to the horizontal position for casting by rotation of the shaft B7 by a toothed segment B18, Fig. 3, on a lever B17, which is operated by a cam. Movement of the mould towards and away from the matrix line is then effected by a lever D acting on the shaft B7 through a cushioning-spring D6. The mould is located in casting position by an adjustable lug on the machine frame. The return of the mould-holder to ejecting position, after the casting, is effected by an air-cylinder, under the control of the operating-cam. The admission of air to the air-cylinder is controlled by a cam-operated valve. Both faces of the mould are wiped, during the upward movement of the mould-holder, by pads carried by cam-operated arms which are pressed towards each other by springs. After disengagement of a latch, the shaft B7, together with the mould-holder, can be removed from the machine. (2) The mould-magazine L is adjusted for selection of a new mould by means of a hand-lever P, which rotates a pinion P8 gearing with a rack on the underside of the magazine. Before a new mould can be inserted into the holder, the mould in use must be returned to its proper compartment in the magazine. The transfer of a mould from and to the mould-holder B is effected by a slide L10 movable in a guide Ll and operated by an aircylinder L20, the admission of air to which is controlled by a handle O. The slide L10 normally projects through the magazine-compartment belonging to the mould in use, so that movement of the magazine is prevented, and a lug on the upper end of the slide is in engagement with a hookportion A10, Fig. 26, on the lower end of the mould in use. The slide L10 is locked in the raised position by a half-round shaft L14. When the mould is to be changed, the handle O is shifted, and the latch B8 and the cams B14, which retain the mould in the mouldholder, are thereby released. The half-round shaft L14 then turns, so as to unlock the transfer-slide L10, and air is admitted to the cylinder L20, so that the transferslide is drawn down and the mould is returned to the magazine. After selection of a new mould by means of the hand-lever P, the handle O is moved in the reverse direction, and the new mould is raised into the mould-holder, in which it is locked. Ejecting type-bars-The ejector is operated by pneumatic power under the control of a cam. Toggle-levers G4, G5, Fig. 20, are connected to a fixed pivot G7 and to the ejector-slide G2 respectively. The toggle-lever G4 is operated through a link G20 from a lever G11, which is actuated by the piston-rod G15 of an air-cylinder, the movement of the pistonrod being controlled by a cam. Another cam effects the admission of air. to the cylinder. The togglelevers are designed so that the thrust is greatest at the beginning of the stroke, when the slug breaks away from the mould. When the mould reaches the ejecting position, it is locked by a sliding bar g9. If the bar g9 is prevented from moving, owing to delay in the movement of the mould, a lever g10 connected to the bar g9 remains in engagement with a notch in the toggle-lever G4, so that the ejector is locked. The operation of the ejector before the mould has reached the ejecting position is prevented by a valve which controls the admission of air to the ejector-operating cylinder. The valve remains closed until it is opened by the arrival of the mould in the ejecting position. The width of the ejectorblade is automatically adjusted in accordance with the length of the mould when a new mould is selected. The mould-magazine L, Fig. 3, carries a series of vertically adjustable stops R15, one for each mould. When the magazine is shifted to select a mould, the associated stop is brought beneath the en ot a lever R12, the opposite end of which is pivoted to a vertically sliding bar R5, Fig. 20, which selects the appropriate number of ejector-blade sections Gl. The lever R12 is first raised and then lowered into contact with the stop R15 by the air-cylinder L20, that operates the mould-transfer slide L10. Trimming type-bars.-The base of the slug is trimmed by a back-knife F, Fig. 23, during the rotation of the mould-holder into the ejecting position. The knife is adjustable along inclined lugs F2 by means of screws F4, F5. A curved guide supports the free end of the mould-holder, in order to prevent distortion during the trimming. The slug is ejected between trimming-knives, the distance apart of which is automatically adjusted in accordance with the width of the mould in use. This is effected at each change of mould by means similar to those used for adjusting the ejector-width, and comprising adjustable stops on the mould-magazine. The knives are wiped by a sliding wiper operated from the mechanism that rotates the mould-holder, so that the knives are wiped before the mould reaches the ejecting position. Metal-pots.-The metal-pot is movable horizontally on rollers towards and away from the mould, and is operated by a cam acting through a spring on togglelevers. The pressure exerted can be adjusted by means of a wedge. Specification 551,171, is referred