Patent GB-193075-A (GB)
Title: Improvements in brickmaking machinery
IPC: B28B11/16
Filed: 1921-08-18
Abstract: 193,075. Dyhrberg, L. N. Aug. 18, 1921. Stream-cutting machines; extrusion machines. -In a brick-cutting machine having a cutting table 22 which is set in motion by the pressure of the extruded clay bar, said motion actuating the cutting mechanism, the cutting table 22 is adapted to telescope partly under a stationary stand 13 placed between it and the pugmill 7, and is provided with outwardly flanged side walls 13<a> which ride over the fixed table 13. The table 22 is suspended by a framework 27 from an overhead track 25, the framework also supporting cutting wires 28 ard carrying a plunger 29 by which the clay column is forced through the cutting wires. The plunger 29 is supported by arms in a frame 32 slidable on a horizontal power shaft 31, and is reciprocated on toothed carrier arms 50 by means of adjustable arms 122 driven by eccentrics on a countershaft 127. The latter is actuated from the shaft 31, the shaft being thrown in and cut of gear by the engagement and disengagement of a clutch disc 130 with a dog-toothed wheel 129 by means of a rocking pawl thereon. The latter is actuated by means of a rod 135 which during the outward motion of the cutting table strikes against a trip plate 138, which has an inclined edge and is pivotally mounted so as to allow the undisturbed passage of the rod 135 in the opposite direction. Locking means for holding the cutting- table in its receiving and cutting positions comprise two pivoted arms 79, 81, Fig. 9, having bent ends 79<a>, 81<a>, secured respectively to the rod 76, which reciprocates the cutting table, and to the underframe of the table 22. The arm 79 is connected by a rod 82a to an eccentric 82 mounted on the edge of a disc 77 so that its longest throw either wav is beyond that of the disc, while the arm 81 is pivoted through links with a horizontal lever 85 mounted on the end of the table 22. The clay bar in its forward motion impinges against the lever 85 and withdraws the arm 81 from engagement with the arm 79 and thus allows the table to move forward under the pressure of the clay bar. The table, in its motion draws with it the rod 76 and thus rotates the crank 77 so as to bring the arms 79, 81 again into engagement and lock the table in its cutting position. Disengagement of the table for its refurn movement is effected by an inclined arm 81<a> mounted on a carrier arm 50 which during the forward motion of the plunger engages the upturned end of the rod 83. During the motion of the table, the clay bar is severed by a pivoted bar cutter, and clutch mechanism is thrown into operation for mechanically advancing the table at greater speed; the mechanism comprises a driving shaft 31 operating by bevel gearing 86, 87, a sleeve 88 which normally rotates loosely on a countershaft 78. The sleeve. 88 and shaft 78 are clutched together by the engagement of a toothed wheel 89, Fig. 8, in the former with a disc 90 on the latter. For this purpose, a pivoted rocking-pawl is provided with arms 94, 91, the arm 91 being normally held in contact through a roller 91<a> with the teeth of the wheel 89 by a spring 92, and being set free by a rod 95 mounted in the underframe of the table 22 coming into contact with the arm 94. A trip rod 97 having a bent end 98 engages the projecting arm 91 as it reaches its highest position during its rotation round the wheel and then releases the clutch. Shocks are absorbed by forming the rod 76 in outer and inner portions connected by springs.