Patent GB-481478-A (GB)
Title: Improvements in and relating to typographical slug casting machines
IPC: B41B11/18
Filed: 1937-06-24
Abstract: 481,478. Type-bar-making machines. MERGENTHALER LINOTYPE CO. June 24, 1937, No. 17584. Convention date, Sept. 5, 1936. [Class 100 (iii)] Assembling matrices.-In machines having means for supporting two-letter matrices bearing characters of the regular sizes and special matrices bearing characters of larger size at different upper levels in the first elevator, means are provided for securing the " regular " matrices against upward displacement when supported at the upper level. As heretofore, matrices composed at the lower level, whether regular or special, are supported by their upper ears on fixed rails a, regular matrices are supported at the upper level by a retractable rail B, and special matrices are supported at the upper level by a supplementary retractable rail B<1>. The lower edge of the bar A<4>, that provides one of the fixed rails a, serves to prevent upward displacement of special matrices assembled at the upper level, and is formed with a rib a<2>, which extends into notches in the lower ears of the matrices to prevent them from being pulled rearwardly by the mould in its retreat. The retractable rail B is normally held in operative position, as hitherto, by levers A<6> and springs A<7>, and is temporarily retracted by fixed cams, as the elevator rises, to permit the matrices to fall to the lower level. The supplementary rail B<1> is normally in retracted position, and is advanced, when required for supporting special matrices, by a pair of hand-operated slides F, F<1>, which are relatively movable, but are connected by a depending lip F<4> on the upper slide F engaging a recess in the lower F<1>, which is provided with a handle F<3>. The upper slide, when pushed inwards, acts through rockerarms H, rods H<4>, and levers H<5> to project the supplementary rail B <1>. When the elevator rises, the rail B <1> is retracted by the lower retractable rail B, but it is advanced again by springs H<6> on the descent of the elevator, the slide F moving accordingly. The lower edge of the rail A<4>, which prevents upward displacement of the special matrices, does not effect this for' the regular matrices, the lugs of which occupy a lower position, and a pair of hold-down members J, J<1> are therefore provided for the purpose. The members J, J<1> are guided by pins-and-slots on the inner faces of the elevator walls, and overlie the upper ears of the matrices. When the supplementary rail B<1> is in active position, the members J, J<1> are free, and are cammed upwards by the special matrices as they enter the elevator. When regular matrices are to be composed, the slide F' is drawn forwards by means of the handle F<3>, and levers operated thereby cam down the front member J, if it has not already fallen, and lock it in position, so that upward displacement of the matrices is prevented. The slide F<1> also retracts the slide F and withdraws the supplementary rail B<1>. The rear hold-down member J<1> is operated by gravity alone. The members J, J have on their lower edges thin flat springs, which bear on the top edges of the upper ears of both regular and special matrices when in the upper position, so as to prevent them from twisting.