US 3721165 A
A phototype composing machine having a continuously rotating character drum and a continuously moving line composing carriage is disclosed. The arrangement is such that by varying the carriage speed and the position from which a character is projected from the drum, the image of the character will be properly located on the recording medium.
Description (OCR text may contain errors)
United States Patent 1191 1111 3,721,165 Knoli 5]March 20, 1973  PHOTOTYPE COMPOSING MACHINE 3,422,736 1/1969 Moyroud et al ..95/4.5 WITH ROTARY CHARACTER DRUM 3,303,764 2/ 1967 Kudlicki et a1. ....95/4.5 3,218,945 11/1965 O'Brien et a1. ..95/4.5  Inventor: Alois Knoll, Bahnhofstrasse 33, 3,183,806 5/1965 O'Brien et a1. ..95/4.5 079 guchschlag, Germany 3,122,074 2/ 1964 O'Brien ..95/4.5 2,966,836 1/1961 Higonnet et a1 ..95/4.5  Filed: Dec. 1, 1970 Primary Examiner-Robert P. Greiner [211 939% Attorney-William P. Keegan  Foreign Application Priority Data ABSTRACT Dec.1 1969 Germany ..P 19 60 161.7 A Phototype composing machine having a ously rotating character drum and a continuously moving line composing carriage is disclosed. The ar-  15.51. ..95/4.5 R museum! is such that by varying the carriage Speed [5 litand the position from a character is projected  Fleld of Search ..95/4.5 from the drum, the image of the charabter will be properly located on the recording medium.  References Cited 4 Claims, 1 Drawing Figure UNITED STATES PATENTS 3,450,014 6/1969 Astley ..95/4.5
l w 25 4 1- 11 71 -7 11 U V 10 & a [L 30s. kWh-i 11- max PATENTED MAR 20 I973 I'TIOX PROTOTYPE COMPOSING MACHINE WITH ROTARY CHARACTER DRUM The invention relates to a phototype composing machine having a rotary character drum and a carriage for composing the type lines, said carriage being continuously transportable along a line for the purpose of placing images of exposed characters in side by side relationship on a sensitized sheet. Since the character drum and the line composing carriage are both con tinuously moving, there is provided means for adapting the carriage speed to the incremental speed of the characters previously exposed, storage means for determining the instant of flash in dependence on the width of the exposed line as well as in dependence on the carriage position and of the set values of the letters remaining to be exposed. There is also a comparator having an input connection with the aforesaid storage means and with a register that indicates the position of the carriage. The output of said comparator communicates with a logical switching network that combines the output value of the comparator and a value corresponding to the position of the character drum to effect operation of the flash lamp to expose a selected character.
According to a known phototype composing machine, storage or memory means are provided in which all characters of a line are stored and the set values of the characters are red-out for calculation of the interword spaces needed to justify the line. The positions or widths of the characters to be exposed, are supplied to registers associated with each character and the outputs of such registers are corrected with a comparator that compares the widths of said characters with the position of a continuously moving line composing carriage. The output of the comparator is connected with logical switching network. Such logical switching network is furthermore connected with the output of an additional comparator, where the locations of the letters on the drum, as measured from a reference station, are detected by scanning of markings on the drum. As means for adapting the carriage speed to the incremental speed of the exposed line, a counter is provided which counts the number of exposures dur ing each drum revolution, the speed of a driving motor for the carriage being regulated accordingly.
In connection with the above phototype composing machine, the comparator thus receives singularize informations from each of the registers about the position of a character within a line and successively compares it with the information received as to the carriage position at each instant. For the purpose of timing the exposure, which is by means of a cathode ray tube, the comparison results are received by the logical switching network which is supplied with the output values of the comparator for the drum position and the output values representing the positional locations of the specific characters with respect to the reference station on the drum. The timing of the exposure and the displacement of the bright zone of the cathode ray tube are regulated by the logical switching network in accordance with the information fed to the network. Since data about several letters are processed in parallel, the sequence of exposures need not necessarily correspond to the sequence of characters within a line. The composing speed for such a system is limited by the advance speed of the carriage which depends on the number of exposures during a past drum revolution. The result is that the carriage speed may be determined almost correctly for the next succeeding drum revolution. This is possible, from a practical standpoint, only when composing straight matter, i.e., text matter of one point size and a single type style. When changing type size or considering other interruptions in line composition, there is the danger of displacing the zone of exposure by the continuously actuated carriage to such an extent that any balancing by timing the flash is no longer possible.
The present invention is based on the problem of achieving a maximum possible composing speed by increasing the speed of the carriage used for line composing purposes. The increase in composing speed is achieved by varying the speed of a continuously moving carriage and simultaneously controlling the instant at which the selected character is exposed so that the carriage will be speeded up when a wide character is to be exposed and slowed down when a narrow character is to be exposed.
In carrying out the invention in a phototype composing machine having a rotary character drum and a line composing carriage, both of which are in continuous motion, the problem is solved in the following way. A line register is provided to store the cumulated character widths of the exposed line. This information is compared to a count corresponding to the position of the line composing carriage, and the difference in values is fed to a so-called adding device. Also a maximum value control mechanism is provided which has an input for the width value of the next character to be exposed. The character width value is fed to a subtracting device where it is subtracted from a specific value, e.g., the width of an em quad, with the remainder fed through a second input to the adding device. The output of said adding device then controls the carriage driving device as well as the device for determining the zone through which a character can be exposed from the character drum. This latter device is an apertured plate through which the light from a selectively exposed character passes to the optical projection system and the sensitized sheet on which the character image is recorded. The aperture permits only the light passing through the selected character to reach the sensitized sheet, and the character is exposed by flashing a light source as the selected character on the rotating drum reaches the optical axis of the optical projection system. The position of the recorded image can be shifted by timing the flash of the light source so as to expose the selected character either before or after it reaches the optical axis. The aperture will similarly be shifted so as to allow only the light passing through the selected character to reach the sensitized sheet. The permissable range for shifting the aperture is called the range of exposure and it is limited, for example, to two em quads of the maximum composable type size so as to avoid image distortions caused by exposing characters too far off the optic axis.
The phototype composing machine according to the present invention operates on the principle that a regulation of the carriage speed of the continuously displaceable carriage is carried out in consideration of the set values and spaces of several characters succeeding a letter previously exposed. The advance speed of the carriage is adjusted in such a way that the widest character of the characters following the exposed one may be definitely projected within the range of exposure. The remaining maximum possible portion of the range of exposure corresponds to that portion where the carriage is allowed to fall behind the subsequent line increment before the carriage has been accelerated to the corresponding higher speed. When exposing selected characters, particularly those of relatively great width, which closely follow one another on the character drum, a further drum revolution must be less frequently waited because until the range of exposure is sufficiently large so as to permit the aperture to be shifted to a position which together with the timing of the light source flash compensates for the actual position of the carriage which otherwise would not be properly located. Since, on the other hand, the maximum set value of the subsequent characters is taken into consideration, the carriage need not be decelerated for exposure of such character. On the whole, the carriage thus runs with maximum permissible speed. Any instability factors are practically eliminated in this connection. An optimum advance speed is thus achieved by adjusting the maximum possible advance speed with a specific allowance for time, which permits better utilization of the range of exposure by selection of the flash instant.
As concerns this phototype composing machine, a line register is provided which is supplied with the width value of the already exposed characters in a line. The output of the line register and the output of a positional register for the carriage are always communicating with the comparator so that any troubles by error propagation are eliminated. Besides being connected with the line register, the set value storage is also connected with the maximum value control mechanism, which is supplied with the set values of the subsequent characters in a line and the spaces between them. The maximum value control mechanism transfers the maximum set value of the characters succeeding the specific character having been exposed lastly, to the subtraction device, where said value is subtracted from a specific value. The balance enters the adding device. The carriage drive and the motion of a device for limiting that range of the character drum which is reproduced on the record means, are controlled by the output value of the adding device. Such range limiting device may be constructed as a displaceable apertured plate.
Features and advantages of the invention may be gained from the foregoing and from the description of a preferred embodiment of the invention which follows.
In the sole figure of the drawing, the electrical circuitry for carrying out the invention is shown in schematic, block diagram form.
In the drawing the reference numberal 1 refers to a character drum rotating in the direction of arrow. inside the drum, there is an exposure device or flash lamp 2. In the path of the light rays coming from lamp 2, lenses 3, 4, and are provided which serve, respectively, for collection of the light, for collimation of the beam of rays projected through the character drum 2 and imaging a projected character onto the sensitized sheet 6. The path of rays of the optical system is illustrated by its optical axis. Lens 5 is rigidly mounted on a carriage 7, which also carried a reflector 8 for deflection of the path of the light rays. Through a driving device 9, carriage 7 is continuously displaceable. A lined screen piece 10 is connected to the carriage, and, when the carriage is moved, passes between a source of light 11 and a photodiode 12.
The electrical equipment of the phototype composing machine covers a positional register 13 for the carriage, which communicates with photodiode 12. in correspondence with the movement of the carriage 7 the screen 10, the photo-diode will for instance produce one impulse for each one forty-eighth of an em quad of the smallest type size the carriage 7 moves. Furthermore, a line register M is provided, whose input may be supplied with the width values of all characters and spaces of a line as they are exposed. The register 14, therefore, has a value at any instant of the cumulated character widths and spaces of the characters already exposed. An output 16 is led to a comparator 17 which is moreover connected with the positional register 13. 0ver the output 16 of the line register, information is delivered in correspondence with the exposed line section. The input of the line register communicates with a character width value storage device 15, which is coordinated with a line storage 15a intended for coding the characters and spaces of one line. The width value storage device 15 may be either constructed as storage with permanent wiring or else as magnetic drum storage device. The output 18 of the width value storage device 15 is connected with a maximum value control mechanism 19, which is supplied with the width values of the subsequent n characters to be exposed. In practice, the value of n will preferably be at least 2. Or, in other words, if the maximum value control mechanism is supplied with the set value of a character to be exposed, the same width enters the line register, where it is added to the width values of the previously exposed characters and spaces. The output value of the maximum value control mechanism is subtracted in a subtraction device 20 from a value supplied to the input 21 of the subtraction device, which corresponds to the value of one em quad of the maximum point size that can be reproduced in the machine. The remainder enters an adding device 22, which is additionally supplied with the output value of comparator 17 Depend ing on the total, driving device 9 of the carriage as well as driving means 24 of a movable diaphragm 25 are regulated over an amplifier 23.
To select a desired character prior to its entrance into the zone of exposure, a source of light 26, a photodiode 27 as well as a code comparator 28 are provided. The code of the selected character to be exposed is supplied to an input 29. The output of the code comparator is connected with a positional register 30 for the drum.
The output of positional register 30 for the drum as well as that of comparator 17 for the deviation of the carriage position lead to a comparator 31. The output of comparator 31 communicates with an ignition switch 32 supplying the exposure energy for exposure device 2 at the correct point of time, when the deviation of the carriage position corresponds to that of the drum position.
What is claimed is:
1. A phototype composing machine having a continuously rotating character carrier, aperture means through which a selected character is projected, and a continuously moving carriage mechanism for putting character images on a sensitized sheet in side by side relationship, and comprising means for varying the speed of said carriage mechanism and the position at which a selected character on said character carrier is illuminated for imaging on the sensitized sheet, said means including a line register wherein the widths of all previously exposed characters are cumulated, a carriage position register wherein a valuerepresenting the instantaneous position of said carriage mechanism is stored, comparator means responsive to the values stored in said line register and said carriage position register for producing an output indicative of the relative position of the already composed characters and the position of the carriage mechanism, an addition unit for modifying the output of said comparator means depending on the width value of the character next to be composed, means for varying the speed of the carriage mechanism and for shifting said aperture means in accordance with the modified output of said comparator means, and means for controlling the exposure of a selected character whereby a composed line is imaged in the order in which the characters are to appear.
2. A phototype composing machine according to claim 1 wherein the addition unit for modifying the output of the comparator unit is responsive to the widths of at least the next two characters to be composed.
3. A phototype composing machine according toclaim 2 wherein the addition unit modifies the output of the comparator unit by a value equal to a value corresponding to an em quad of the maximum type size to be composed less a value corresponding to the widths of the next two characters to be composed.
4. A phototype composing machine according to claim 1 wherein the exposure controlling means includes a second comparator responsive to the output of the aforesaid comparator and the position of the character carrier whereby the selected character is exposed at a time dependent on whether the carriage mechanism is ahead or behind the position represented by the cumulated width of the already exposed characters