Patent GB-190118306-A (GB)
Title: Improvements in the Trimming Mechanism of Linotype Machines.
Inventor: LOCK WILLIAM HENRY
Filed: 1901-09-13
Granted: 1902-09-11
Abstract: 18,306. Lock, W. H., and Wich, F. J. Sept. 13. Linotype machines.-Relates to the trimming- mechanism of linotype machines, and is described with reference to the Mergenthaler machine, (Specification No. 14,582, A.D. 1890). The trimming-mechanism is so constructed that the knives are held at the normal distance apart when ordinary linotypes are being produced, but one of them is automatically moved aside when a linotype having one or more two-line or overhanging capitals is to be passed between them. Fig. 1 is a vertical section of the machine, showing the mould-wheel O and vice frame P<1>. Fig. 2 shows the trimming- mechanism from the rear, and Fig. 3 a plan view of the same. The right-hand or movable knife 1 is mounted in dovetail or undercut guides 2 secured to the rear side of the block P<1>, so that it can be approached to or withdrawn from the fixed knife 4. An ejection port 6 traverses the block P' from front to rear, and through it pass the linotypes after leaving the knives 1, 4. The movable knife 1 is pivoted to toggle links 8, the companion links 8<a> of which are pivoted to the block P<1>. The toggle links are connected to a vertical link 11, in the lower end of which is formed a rectangular aperture 12. The horizontal arm 13 of a bellcrank lever 13, 14 engages with the aperture 12, and by raising or lowering the link 1] serves to close or separate the knives 1, 4. The lever 14 is adapted to be rocked by cam-pieces 25, 26 through the medium of a plunger 22, lever 19, and link 18, and a spring 28 tends to keep the knives in their most closed position, for the trimming of ordinary linotypes. To the rear of the movable knife 1 are secured two bracket bearings 29, 30, in which is pivoted a vertical rod 31 so as to be capable both of axial and rotary movement. To the lower end of the rod is secured the stem of a fork 32, which is shown in rear elevation and plan in Figs. 4 and 6 respectively. The arms of this fork embrace the link 11 from opposite sides, and the arm 33 is normally held forward by a spring so that the projection 33<a> enters the aperture 12 above the horizontal arm 13 of the bell-crank lever 13, 14. The same spring tends to bold the fork and its rod 31 in their highest position. One or other of the projections 33<a>, 34<a> is always within the aperture 12, and the depth of the aperture is such that a clear space equal to its full stroke is always left above or below the arm 13. Projecting laterally from the rod 31 are two arms which carry a bar or plate 38 in close proximity to the rear edge of the movable knife 4. When the machine is casting ordinary linotypes, the projection 33<a> is above the arm 13, the link 11 is raised, and the knives are at the minimum distance apart. When the cams 25, 26 depress the arm 13, it descends in the clear space beneath it without shifting the knives. When a linotype bearing an overhanging capital has been cast, the forward movement of the mouldwheel O prior to ejection causes the overhanging capital to press forward the plate 38, and rock the rod 31 and fork 32. The projection 33<a> is thus swung rearwards out of the aperture 12. and the projection 34<a> enters the aperture beneath the arm 13. This occurs just before the cam-piece 26 actuates the plunger 22, and consequently, when the arm 13 is depressed, it forces down the link 11 and separates the knives The linotype is then ejected, being trimmed only by the fixed knife 4. The cam-piece 25 restores the parts to the normal position in readiness for the ejection of another linotype.