JPS6051106B2 - printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a printer with high printing quality, and relates to a printing device that illuminates a character image recorded on a film or the like using flash light and prints the character image using electrophotography.

Conventionally, when printing a wide variety of characters such as kanji, it was impossible to print at high speed if printed characters were used, so most of the methods used to express the characters using dot matrices.

However, in this case, there were drawbacks such as poor print quality and the need for a pattern generator. The apparatus of the present invention prints characters recorded on photographic film using electrophotography. In particular, when character information is sent, the apparatus moves the photographic film and prints characters corresponding to the character information. It is unique in that it decelerates a little beforehand and prints by flashing a lamp as the characters pass over the optical system (printing position) at low speed.

According to the apparatus of the present invention, high-quality characters that cannot be obtained with the conventional dot matrix printer can be printed at high speed, and there is no need for an electrical memory device for character images, and the control circuit etc. can be simplified. Ru.

Furthermore, not only alphanumeric characters, kana, and kanji, but also all kinds of characters can be printed by simply changing the dial. Furthermore, the size of printed characters can be easily changed by simply replacing the projection lens. Also, since it is a non-impact type, there is almost no noise. In addition, the present invention uses an electrophotographic method, which includes not only a method of transferring and printing on plain paper, but also a simple method of printing on zinc oxide paper, which requires a large number of copies. In this case, it is also possible to print on offset master paper.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a diagram showing the configuration of a printer according to the present invention. In the figure, 1 is a reflecting mirror, 2 is a xenon flash lamp (hereinafter referred to as a lamp) that is installed in front of the reflecting mirror 1 and emits light intermittently, and 3 is a further A lens is disposed in front of the lamp 2 to condense light, and 4 is a slit through which the necessary amount of light passes. It is designed to illuminate one of the character images recorded on the circumference. Here, the character image illuminated through the slit 4 is formed by an imaging lens 6 provided on the circumference of the dial 5, that is, facing the character position, and is reflected by the rotational scanning image 7. and is projected onto the photoreceptor 8.

In this case, if the surface of the photoreceptor 8 is uniformly charged,
A charge latent image corresponding to the projected character image is formed on its surface. Recorded characters are obtained by developing and visualizing this charge latent image. The center of the dial 5 is attached to the rotating shaft 9 of the servo motor drive mechanism 10,
Moreover, it can be attached to and detached from the shaft 9 at will. Further, on the circumference of the dial, as shown in Fig. 2, characters 5a recorded on a film or the like are arranged at equal intervals, and correspondingly slits or marks 5b are carved for confirming the character positions. . The apparatus of the present invention is configured as described above, and a desired printed character is selected from the dial 5 by controlling the servo motor drive mechanism 10, and the selected character is illuminated using the flash from the lamp 2. , and is projected onto the photoreceptor 8 via the imaging lens 6 and mirror 7 to form a latent image. FIG. 3 is a sectional view showing the printer according to the present invention, including a developing section for visualizing the latent charge image formed on the photoreceptor 8. FIG.

In the figure, reference numeral 8 denotes a photoreceptor, which is formed into a drum shape and rotates in the direction of the arrow. 11 is a developing device that develops the latent image formed on the surface of the photoreceptor into a toner image; 12 is a developing device that converts the toner image into a recording paper 1;
3, a transfer section 14 is located after the transfer section, and is a cleaning section for removing residual toner; and 15 is a charger for uniformly charging the upper surface of the photoreceptor 8.

Further, after the toner image is transferred to the recording paper 13, the recording paper 13 is sent to a fixing section 16 including a heater and the like to fix the toner, and is carried out to the outside. To explain the operation according to the diagram, the rotary dial 5 as shown in the second figure is accelerated using a drive device such as a servo motor, and decelerated before the character to be printed. When the lamp 2 comes to a position facing the slit 4, it emits a flash of light.

The light from the lamp 2 is collected by a lens 3 and passes through a slit 4 to illuminate desired characters. The illuminated character image passes through a lens 6, is formed into an image by a mirror 7, and is projected onto a photoreceptor 8. As a result, [the latent image of the desired character appears on the photoreceptor 8].
is formed on the recording paper 1, developed in the developing section 11, and then printed on the recording paper 1.
3 and is printed out after fixing. Fourth
The figure is a block diagram of a control circuit of the apparatus of the present invention, and the present invention will be explained in more detail using this figure.

In the figure, 20 is a central processing unit, hereinafter referred to as CPU. The CPU 2O transmits a drive control signal to each of the drive circuits 22 to 26 according to a program recorded in advance in the program memory 21, and sequentially performs control for printing characters. In other words,
The instructions in the program memory 21'' are retrieved and processed according to the commands of the instructions.Therefore, when a character code signal is input from the outside, the CPU 2O takes in the character code data via the interface 27, and the character code is Address on board 5 (
address).

Then, the position signal sent from the detection circuit 28 that detects the character position on the dial 5 is compared with the address signal corresponding to the character code, and a start/stop control signal is output to the servo motor drive circuit 24. However, the servo motor 10 is driven and controlled by the drive circuit 24 as follows. That is, when selecting a character to be printed, the servo motor 10 is accelerated to rotate the dial 5 at high speed, and then the dial 5 rotates the optical system (printing position) at a low speed in front of the character to be printed. The vehicle will be decelerated so that it passes by.

Regarding this point, let's take the example of searching for a character located at a position 90 degrees off from a certain position on a dial and explain it a little using Figure 5A and b.As a servo motor, the rated torque is 5.76K1 and the maximum torque is 17. If we use .3k9●α, rotor inertia 30.5y●d, and the load inertia of the letter disk is 63.7q-d, it will take 1.16×10-3 sec to accelerate to 2000r'Pm, and during that time The dial disk rotates 7 degrees.

Next, 76 rotates at a constant speed of 2000 r'Pm. This time takes 6.34 x 10-3 seconds. This state is shown in FIG. 5a. Next, it enters deceleration operation and 1.16
The speed is reduced to several tens of Rpm for ×10 −3 sec, and a flash light is emitted when the desired character is on the optical axis. When performing a search by rotating the servo motor in forward and reverse directions, the average search angle for one character is 90 degrees, and when the above motor is used, the time is 8.66 x 10-3 seconds, and the number of prints per second is 11.
Existence. FIG. 5b shows the current when the servo motor performs the above operation. The above operation is performed by CPU2O
The servo motor drive circuit 24 drives and controls the surfo motor 10 according to control signals from the servo motor drive circuit 24. In other words, the motor 10 is controlled so that a current higher than the rated value is passed through the motor 10 during acceleration, and a current of the opposite polarity is passed during deceleration. In this way, the dial 5 passes over the optical system at low speed, and when a desired character comes to the printing position, the CPU 2O outputs a control signal to the lamp light emitting device 22, and the lamp 2 emits a flash of light. As a result, a character optical image corresponding to the character code is projected onto the photoreceptor 8 via the lens 6, scanning mirror 7, and the like. When this operation is completed, a control signal is input to the pulse motor drive circuit 25, and the scanning mirror 7 is moved by one pitch by the pulse motor 31. When the above-described operation is repeated and image projection for one row onto the photoreceptor 8 is completed, a control signal is applied to the pulse motor drive circuit 26, and the photoreceptor 8 is rotated for one row by the pulse motor 32. On the other hand, control signals are sequentially transmitted to the copying device 23 in synchronization with the above operations, and development, transfer to the recording paper 13, and feeding of the recording paper 13 by one pitch are executed. still,
A disk was used as a dial and the characters were lined up in a line, but printing speed could be improved by lining up the letters in several cases.

Furthermore, when projecting a character optical image onto the photoreceptor 8, the size of the printed character can be freely changed by selecting an appropriate optical system, and by replacing the dial 5, any character can be printed.

Furthermore, using a drum as a dial, characters can be arranged in numerical rows and printed one line at a time, making it possible to increase speed.

Furthermore, although a lens system is used as the illumination light, an optical fiber may also be used. As described above, the present invention moves a dial on which characters are recorded on a film or the like at high speed, decelerates it slightly before the character corresponding to the character information, and causes the character to pass over the optical system (printing position) at low speed. At the time of printing, a lamp is flashed and a light image of the characters is projected onto a photoreceptor to form a latent image, which is then developed to print.Therefore, since it is not an impact type, there is no noise and it is similar to the type format. It is possible to obtain the same printing quality and also to obtain a printing speed higher than that of the type format.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining the configuration of the device according to the present invention, and FIG. 2 is a diagram showing an example of a dial on which characters according to the present invention are recorded, in which a is a plan view, b is an enlarged view thereof, and FIG. 3 is a structural diagram of the embodiment of the present invention, FIG. 4 is a block diagram of a control circuit in the apparatus of the present invention, and FIG. 5 is a time chart for explaining the present invention. 2: Xenon flash lamp, 3: Condensing lens, 5:
Dial, 6: Imaging lens, 7: Optical system, 8: Photoreceptor, 1
1: Developing device.

Claims (1)

[Claims] 1. A character font recording a large number of printed characters, a driving means for rotationally driving the character font to print a desired character, and a character position detection means for detecting the character position of the character font rotated by the driving means. In order to select a desired character from the font according to the input signal, the selected character is placed on the optical system (printing position).
The character body is rotated at high speed until it is detected by the character position detecting means that the selected character reaches a little bit in front of the optical system, and then the selected character passes through the optical system. a control means for controlling the driving means for rotating the character body at a low speed for a period of up to 30 seconds; and an illumination means for illuminating the selected character on the character body with a flash at the same time that the selected character on the character body faces the optical system (printing position). A printer comprising: an optical means for projecting an optical image of the selected character illuminated by the illumination means onto a photoreceptor to form a latent image; and a developing means for developing the photoreceptor.