Patent GB-190300755-A (GB)
Title: Improvements in or relating to Matrix-measuring Machines.
Inventor: DUNCAN HAROLD MALCOLM
Filed: 1903-01-12
Granted: 1904-01-07
Abstract: 755. Duncan, H. M., and Pierpont, F. H. Jan. 12. Microscopes for micrometrical purposes.-relates to optical apparatus more particularly applicable for measuring type matrices such as are used in Monotype machines. The matrix to be measured is a rectangular piece of bronze A, Fig. 4, having a transverse perforation A<1>, and a character cavity A<2> at one end. The measurements are to be taken on the end surface A' and on the character surface A<4> which forms the bottom of the cavity A'. Figs. 1 and 7 show one form of the apparatus. The microscope tube B is fixed in the hollow vertical part C<2> of the frame C, C', and comprises an objective, a reflecting-prism B' for vertical illumination, a field lens, an eye lens, and a glass scale B<6>. Beneath the objective is a plate D mounted to slide horizontally in the frame C', the lower surface of this plate being in the exact focus of the microscope. The plate is normally held by a spring D' so that the hole D' formed in it is directly beneath the objective. This hole is slightly smaller than the end of the matrix, so that, if the matrix be pressed up against the undersurface of the plate at this point, its end surface will be in focus, and the greater part of it visible. Near the hole D<3> is a second hole D<4>, the lower part D<5> of which is enlarged to receive the end of the matrix the vertical depth of such enlargement being equal to the depth of the cavity A' in the matrix. The matrices to be measured are placed in a feed-galley G, and the end one is engaged by a recess in the upper end of a vertical slide E, a pin E<1> on the slide engaging in the hole A<1> in the matrix. The slide is operated, to move the matrix up to the plate D, by a hand-lever E', pivoted at E<3>. The measurements of the surface A<3> are then noted, after which the plate D is pushed in until the hole D<4> comes over the matrix, and the end of the matrix is lifted into the enlarged part of the hole to bring the surface A<4> into focus. The plate D is pushed in by a pusher slide E<4>, on the lever E<2>, held in its outer position by a spring E<5>. After the measurements of the surface A<4> have been taken, the lever E<2> is pushed down until a pin E<6> on the pusher E<4> engages the upper end of a pivoted arm F held by a spring against a stop pin F<2>. This brings the matrix in line with a receiving-galley G<1> and with an ejector slide H, and the latter is also now in line with the pusher E<4>, as is shown in Fig. 1. The pusher E<4> is pushed in, pressing in the slide H and ejecting the matrix into the galley G. The pin E‹ is, by this movement of the pusher, moved clear of the arm F, and the lever E<2> is then pushed down to its lowest position and releases the slide H, which is moved outwardly by a spring H<1>. As the lever E<2> is moved up, the pin E<6> rocks the arm F on its pivot. Any matrix not of the required measurements may be ejected from the galley G<1> by operating a pusher K. Another form of apparatus is shown in plan view in Fig. 13. In line with the objective B' is a long rectangular tube M, in which is a ground glass screen M' on which the image is projected and on which the scale is ruled. Between the objective and the matrix carrier E, E' is a mirror N with a central hole N'. On the matrix carrier is a pin engaging a cam-slot o<2> in a cam-plate 0, reciprocated in guides L<2> by a slotted arm O<3> on a shaft O<4> operated by a rod D<10> connected to an arm on a shaft O<8> having an operating-handle O<7>. The camgroove is so shaped that the matrix is stopped with either of the required surfaces in focus, and in the return movement is stopped for ejection from the carrier into the receiving-galley G<1>. The matrices are moved along the feed-galley G by a block G<2> connected to a cord and weight G<3>. The ejector P<1> is on an arm P pivoted at P<2> and operated by a pawl O<13> pivoted on a plate fixed on the shaft O<4>. The pawl yields in the forward movement of the carrier E but operates the ejector in the return movement. Defective matrices may be ejected from the galley G<1> by a pusher operated from a shaft R<2> having a handle R<3>.