Patent GB-190406294-A (GB)
Title: Means for Positioning Printed Characters or Designs upon a Planographic Printing Surface.
Inventor: MILLS BENJAMIN JOSEPH BARNARD
Filed: 1904-03-15
Granted: 1904-04-21
Abstract: 6294. Mills, B. J. B., [Cornwall, G. R.]. March 15. Lithographic and like printing ; chases ; leads and rules; printed strips, arranging into page or column form ; cutting and perforating apparatus ; feeding sheets.-A planographic printing-surface of the kind described in Specification No. 7165, A.D. 1903, may be built up in a special frame, from a series of single strips, and means may be provided to make the printed lines on the transfer sheet, which may be of the kind usually employed in planographic printing-processes, agree exactly with the position of the before-mentioned strips forming the printing-surface. The chase or frame holding the units or strips forming the printing- surface may consist of two parts 7, 8, Fig. 5, the part 7 forming three sides of the frame. The part 8 forms the fourth side, and is fixed to the part 7 by pins 25, and bolts 22. IE desired, all the four sides of the frame may be formed separately and clamped together. On the inner sides of the chase are clamped the strips .9, formed with grooves 13 to receive the "leads" or plain strips 14, alternating with V-shaped ribs to hold the bars or units 26. The "leads" 14 and the bars 26 are of the same metal, and, when clamped in the frame or chase, they form a homogeneous printing-surface, ready to have the impressions transferred to it. A little further from the printing-surface than the strips 9, two strips 16 are fitted in grooves formed either completely in the frame, or partly by the frame and partly by the strips 9. These strips are fitted with short tapered pins 3, accurately spaced with the bars 26, and also with the holes 2, Fig. 3, in the transfer sheet, on which the typographic impressions have been formed possibly in a machine such as that described in Specification No. 10,910, A.D. 1903. The pins 3 normally project above the printing-surface, and cause the lines of printed matter on the transfer sheet, which are spaced exactly to correspond with the holes, the pins, and the bars or units of the printing-surface, to register accurately with the printing-surface units 26. The slots holding the bars 16 are deeper than the bars themselves, so that rollers passing over the printing-surface may depress the pins 3 and therefore the bars 16, against the action of springs situated in holes formed in the frame below the bars. Thumb-screws 17, working in slots in the bars 16, control the movement of the bars, and, by being withdrawn, allow of their removal, when necessary, for cleaning. The transfer sheet may be plain, or formed with slits 4 as shown in Fig. 3, between each line of type, which slits may be carried right through one or both sides, thereby rendering the sheet less liable to distortion by warping, and also making each line independently adjustable on the corresponding bar. Lines of perforations may be used instead of slits if preferred. The slits may be formed in any suitable manner, such as by a gang of knives or cutters accurately spaced the correct distance apart.