Patent GB-484625-A (GB)
Title: Improvements in and relating to typographical slug casting machines
IPC: B41B11/38
Filed: 1937-03-25
Abstract: 484,625. Type-bar-making machines. MERGENTHALER LINOTYPE CO. March 25, 1937, No. 8897. Convention date, April 11, 1936. [Class 100 (iii)] Quadding-apparatus.-In quadding-apparatus of the kind in which the line-clamping jaws are actuated through two distinct trains of connections from a vertically movable rod, means comprising a pair of pawls having common operating means are provided for applying clamping pressure to the matrix line after the jaws have closed upon it. The vertical jaw-operating rod H, Fig. 1, is, as heretofore, connected to the supports E<1>, F<1> of the jaws E, F by levers E<2>, F<2>. The rod has at its upper end a grooved collar H', Fig. 18, adapted to engage pins e, f on the levers. The collar is cut away at one side h<2>, leaving a relatively shallow groove, and at the opposite side h<3> the upper flange of the collar is entirely cut away. For regular operation, the collar is in the position shown in Fig. 18, with both pins in the groove, but the rod is disconnected from its actuating- mechanism and an extension h<4> overlies a lug d on the vice-frame to prevent movement of the rod. In other positions of the collar, one or the other or both of the jaws are connected to the rod H for right- or left-hand quadding or for centring. The rod is turned by a sliding rack-bar J and a hand-lever D<5>. The rod telescopes into a sleeve H<5>, to which it may be connected by two dogs h<5>, pivoted in the sleeve and adapted to engage a groove h<9> in the rod. The sleeve is operated from a lever H" through a second sleeve H<7>, the two sleeves being connected, with capacity for slight relative movement, by a spring H9. When the jaws are arrested by contact with the line, the sleeve H<7> rocks the dogs h<5> and releases the rod H. When the rod is set for regular machine operation, the dogs h<5> pass idly through notches in a collar at the lower end of the rod. When the jaws have closed on the line, they are held in position by pawls K, K<1>, Figs. 1 and 10, which are pivoted for vertical movement to posts K<2> mounted on the vice-frame, and co-operate with teeth E5, F5 formed in the top edges of the jaws. In the outer position of the jaws, the pawls rest on short plain portions, or lands, so that a limited inward movement of the jaws can occur before the pawls engage the teeth. The pawls are also arranged to swing for a limited distance in the horizontal direction. The outer position of the pawls is determined by sliding blocks K9, K<10>, which contact with fixed stops. In the case of a line containing spacebands, spreading of the line by justification will force the jaws outwards and take up any slight clearance between the pawls and the teeth. The blocks K9, K<10> can be drawn towards each other by a rod L in order to clamp tightly a line containing no spacebands. The rod L is operated by the pump-stop lever P, which is rocked by a lever P<1> actuated through a sliding pin p<6> from a vertically moving rod P<8> having a cone-shaped head. The rod P<8> is spring-actuated under the control of a cam, so as to be arrested when the pawls clamp the line. If the lever P <1> makes more than a slight movement, it moves into the path of a lug p<1> on the pump-lever P<3>, so that the pump is locked. In this way, if the jaws are arrested in such a position that the movement of the pawls is insufficient to clamp the line, e.g. if the jaws have stuck, casting will not take place. Casting is also prevented in regular operation when the line is not justified, the pawls sliding along the lands sufficiently to stop the pump. To prevent locking of the pump by the sliding of the pawls on the lands in the case of a properly justified line of full measure, a slight outward movement of the right-hand jaw during justification acts through a lever S, Fig. 16, to raise a stop S<5> into the path of the block K<10>, so that the pawls cannot move. In quadding with the left-hand jaw, when movement of the pawls is necessary, an abutment S <6> is removed by hand from the path of the stop S<5>, so that the stop does not arrest the block K<10>. The degree to which the jaws can move before the pawls pass off the lands and come in contact with the teeth is adjustable by means of screw thimbles K<7>, K<8>, Fig. 10, threaded into the blocks K<9>, K<10>, and serving as abutments for the pawls. The thimbles are rotated, to adjust the pawls, by a rod T having at the right-hand end an operating knob and a scale. The left-hand jaw is adjustable with respect to its support E<1> to correspond with various lengths of mould, by means such as those described in Specification 473,710. The land associated with the jaw is not integral with it, but is carried by the jaw support, so that it is always in position to co-operate with the pawl. Cleaning matrices.-The pawls are raised out of engagement with the jaws by sliding rods and a lever carrying a roller, which bears against the slide of the first elevator. A depression in the slide receives the roller and allows the pawls to fall, the depression being so located that the pawls are not raised until the matrix line has cleared the jaws. The end matrices thus receive a wiping action against the jaws. Reference has been directed by the Comptroller to Specification 402,809.