Patent GB-1228750-A (GB)
IPC: B41B23/00
Filed: 1967-10-19
Abstract: 1,228,750. Photo-composing machines. LAMSON PARAGON Ltd. Oct. 16, 1968 [Oct. 19, 1967], No. 47737/67. Heading G2A. A photo-composing machine in which a latent image of a business form 20 is produced on lightsensitive material 29, which exposed material is then used to prepare a printing plate used in printing a plurality of copies of the form 20, is provided with means for projecting an image of the form 20 on a viewing screen 2; with projector mechanisms 25, 27 for projecting light patterns identical with part of the form 20 on to the screen 2 so as to overlie the appropriate part of the image of the form; and with means for exposing the material to so aligned light patterns. The light patterns are then changed to be identical with a different part of the form, aligned with the image thereof on the screen 2, and then imaged on to the sheet 29. The business form consists mainly of horizontal and vertical lines and the projector mechanisms 25, 27 accordingly project a vertical and a horizontal line respectively on to the sheet 2. Projector Mechanism (Fig. 3). Light from a source 30 passes through a condenser 31, through a coloured filter of a filter turret 32, through image selector unit 33, through a shutter 38 and lens 39 and is reflected by a mirror 26 which is adjustable in position so that the light pattern is in focus on the screen 2. The image selector unit consists of a black master sheet 35 having different thickness transparent lines therein, and of a gap 36 the length of which is adjustable by masking mechanism 37. Sequence of operation. An image of the form 20 is projected by an optical system 24 on to the screen 2. A horizontal line and a vertical line of light from the mechanisms 27, 25 are projected in correct focus and position on to the screen by the adjustable mirrors 26, 28, the thickness, length and positions being selected at a console Fig. 1 (not shown). When a box composed of horizontal and vertical lines is to be composed the lengths of lines are checked for coincidence at all corners of the box before the material 29 is moved to its exposure position adjacent the screen 2. Horizontal lines are of one colour and vertical lines of another, each of which is distinct from the colours of the paper and lines of the form 20. Retrieval mechanism is provided to automatically set up the positions of the lines obtained in checking the box. This operation is repeated for all lines on the form until they have all been imaged on the copy sheet. In another embodiment Figs. 5, 6 (not shown), the business form (20) has a common support with the light-sensitive material (72), and they are both adjusted so that light patterns formed by the mechanisms 25, 27 are correctly aligned with lines of the form (20). After all these'lines have been projected on to the material (72), text from a negative (65) is projected on to the viewing screen (61) and the form (20) aligned therewith. An enlarging lens system (75) enables more accurate positioning of the text, but there is no enlargement of the image on the material. In Fig. 7 (not shown) a business form is arranged in a head position of the machine. Figs. 8-12 (not shown) relate to two embodiments having complicated mirror systems for projecting the images.