Patent GB-191212868-A (GB)
Title: Type Casting Machines.
Inventor: BHISEY SHANKER ABAJI
IPC: B41B5/06
Filed: 1912-05-31
Granted: 1913-06-02
Abstract: 12,868. Bhisey, S. A. May 31. Type-casting machines; moulds; nicking and trimming type.-In rotary machines in which the moulds rotate in continuous contact with the casting-spout, the type are cast with tangs, and the tang-members of the moulds are arranged next to the casting-spout to take the wear, the length of the type being thus maintained constant. The moulds are preferably arranged parallel to the axis of the wheel. Closed moulds or moulds adapted to open can be used, means of the following character being provided for extracting and conveying the type from the moulds. If pivotal moulds are used, two casting-spouts may be provided, the moulds being arranged to open alternately on opposite sides of the wheel. If closed moulds are used, the nicks are formed by cutters, or the moulds can be provided with movable nick-forming projections which are withdrawn automatically by a cam or gearing to permit of extraction of the type. The nick-forming projections may consist of slides or of rotatable bars formed with flats. The moulds are mounted in channels in the wheel, and are built up from bodyplates, partitions, and cover-plates, each channel preferably containing several moulds adapted to cast a comb of type with a common tang projecting from one corner of the type. The tang-members may, however, be arranged to separate the type. The moulds may be adjustable set-ways by providing an adjustable wedge in engagement with a wedgemember on the movable wall of the mould, this wall being formed with a T-head to engage the matrix. In the machine shown in Fig. 1, the moulds 6 are arranged parallel to the axis of the wheel 1 and the tang-members 19 are mounted on slides 20 and provided with rollers 21 engaging a fixed cam 21<a>, the arrangement being such that the type are extracted from the moulds bv the movement of the tang-members during the passage of each mould from the casting-spout 22 to the top of the machine. The cam is formed with a dwell for maintaining the tang-members in engagement until the type are set. The matrices 14 are adjustably supported by eccentric plates 15 secured to adjusting-screws 16. For casting quads, the matrix is replaced by a core. The wheel is pressed towards the casting-spout by an adjustable spring 24. Water-passages 2 are formed in the wheel, and also, if desired, in the ccverplates of the moulds, in which case the coverplates 9 and the attachment-ring 11 are formed integrally instead of separately as shown. During the passage of the type from the casting- spout to the top of the machine, nicks are cut by one or more rotary cutters mounted on levers on the frame and movable towards the type by cams on the wheel, the cam 21<a> being formed with dwells to maintain the type stationary during cutting. The type are sliced off the wheel at the top by a stationary tangential platform, each comb of type being delivered from the wheel pushing the preceding type along the platform. The platform is provided with an extension consisting of a rotatable polygonal block 35, Figs. 1 and 4, provided on each face with a sliding stop 38 controlled by a fixed cam 37. During the passage under the platform of a part of a wheel not provided with moulds, the type on the platform remain stationary, and at this time the block 35 turns to deliver the type thereon to a shoot 39, the projected stop 38 being retracted by its spring to release the type and the stop on the following face of the polygon being projected. The block 35 may be replaced by a plate adapted to tilt about one edge, or, according to the Provisional Specification, by a chain running over a polygonal block. The platform may be provided with a projection adapted to lift the tang end of the type and thus to prevent the tang from being accidentally broken off. The type may be pushed along the platform by engaging projections on a chain which runs faster than the periphery of the wheel 1, the platform inclining so that the type are gradually carried clear of the projections and are then pushed along by the following type in engagement with the projections. The type thus transferred by the block 35 or the tilting plate to the shoot 39 are arrested by the engagement of the tang with the partitions of a shoot 43, and the tang is then detached by means of a slide 41 operated by a cam 42. The type pass through the shoot 43 to a rotatable toothed bar 44, which transfers them to a tray 46. In a modification, the type are extracted by sliding the tang-member and the cover-plate and matrix-holder away from the base of the mould, the tang being parallel-sided. In this case, the platform is forked at the end, one tine engaging the tangs and the other tine engaging the type-heads. In the construction shown in Fig. 8, the tangs are cast and then ploughed away whilst the metal is plastic, the tang-member having an annular tang-forming aperture adapted to receive a projection 50 on the casting-spout 49 and a plough 51, which is secured to a watercooled bracket 52 and may be adapted to cut grooves in the feet of the type. The plough may be replaced by a projection on the casting- spout adapted to remove the tang immediately after casting. The cover-plates of the moulds carry the matrices, and are pivotally mounted and are opened to permit the type to be extracted by cam-operated sliding pushers which work through the tang-forming aperture. In some cases, the cover-plates remain closed, the matrix-carriers alone being pivoted. Instead of these sliding pushers, the pushers 69, Fig. 22, may be employed. The pushers are normally in the position shown, but are adapted after the moulds have been opened to turn down into engagement with the nicks in the type, a cam 73 being then operative to cause the hooks to slide outwards. The extracted type can be conveyed by the device shown in Fig. 17 comprising a running chain 62 provided with type-carriers 63 co-operating with carriers 64 on the arms 65 of a running chain 65<a>, the type being deposited by the carriers 64 on a tiltable plate 67. According to the Provisional Specification, the tangs can be detached by engagement with the adjacent mould during the delivery of the type to the platform; further there may be two wheels side by side with moulds on the outer faces. Specification 17,417/11 is referred to.