JPS60179771A - Reader printer - Google Patents

Abstract

PURPOSE:To obtain a high resolution when the copy of a film original is made, by scanning the original with a scanning unit equipped at least with a fixing device, transfer paper carrying device, photosensitive drum, and plural image forming elements arranged around the drum at a fixed speed synchronously to the rotational speed of the drum during the course of exposure. CONSTITUTION:When a scanning unit 10 reaches a carrying starting position, a pair of carrier rollers 13 and 14 are rotated and a transfer paper P is carried to make the front end of a picture image on a photosensitive drum 17 coincident with the front end of the transfer paper P. Then signals from an image forming monitor M1 are selected at a switching circuit 39 and the scanning unit 10 makes scan and exposure at a fixed speed synchronously to the rotational speed of the photosensitive drum 17. As the scanning operation of the scanning unit 10 proceeds, the picture of a microfilm O is successively exposed onto the photosensitive drum 17 through an exposure slit 19 and developed by image forming elements, and then, successively transferred onto the transfer paper P by a transfer charger 19.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a transfer type electrophotographic reader printer.

A document scanning method and an optical system scanning method are used as a method of scanning and exposing a photoreceptor with a frame image. However, with the film scanning method, it is difficult to obtain high resolution because minute vibrations during scanning are magnified by the lens, and it has been particularly difficult to apply the method to high-magnification films that require high precision. Further, in the optical system scanning method, a similar problem occurs due to increased vibration of the mirror.

Furthermore, in the optical system scanning method, two mirrors are usually moved at a constant speed, which requires a high level of mechanical precision and is prone to errors due to aging.

Purpose/Summary of the Invention The present invention has been made in view of the above-mentioned disadvantages.
The purpose is to provide a reader printer that can obtain high resolution when obtaining copies of film originals.

In order to achieve the above object, the present invention provides a transfer type electrophotographic reader printer in which a scanning unit is installed reciprocally along the imaging plane of a film image obtained by an optical system, and inside the scanning unit. is provided with at least a fixing device, a transfer paper conveying device, a photoreceptor drum, and a plurality of image forming elements arranged around the drum, and the scanning unit is synchronized with the rotational speed of the photoreceptor drum during the exposure process. It is characterized by scanning at a constant speed.

Example Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 shows a reader printer (1) to which the present invention is applied, which is composed of an illumination system section (2), an optical system section (3), and a scanning unit (10).

When using the reader printer (1) as a reader, the microfilm (
0) is the illumination lamp (5) and condenser lens group (6)
The image is illuminated by lenses (7) and mirrors (8).

(9) and is enlarged and projected onto the screen (S).

Next, when copying the image on microfilm (0),
When the print button (not shown) is pressed, the mirror (9) moves to the position indicated by the dashed line, and the image of the film (0) is enlarged onto the scanning unit (10) via the mirrors (8) and (9). It is projected and imaged on the scanning plane [phase]) L.

The scanning unit (10), as shown in FIG. 2(a),
Inside it, there is a roller type fixing device (11) and a paper feed device (12).
).

Conveying roller pair (13), (14) and photosensitive drum (
17), and around the drum (17) are a charging charger (18), an exposure slit (19), a developing device (20), a transfer charger (2]), a separation charger (22), and a cleaning device (23). , image forming elements such as an eraser lamp (24) are arranged,
These are rotatable by an image forming motor (Ml) shown in FIG. Further, a pair of conveying rollers (13),
(14) and the ejection part of the fixing device (11).
A sensor (S1) that confirms the passage of the transfer paper (P),
(S2) is provided.

Scanning unit (10) equipped with the following devices inside
is installed on the main body of the reader printer (1) via an Accuride rail (not shown) so as to be located at the same height as the peripheral surface of the photoreceptor drum (17) or the scanning surface @), A scanning motor (M2) shown in FIG. 3 allows reciprocating movement in the lateral direction within the main body.

Further, a home switch (S3) is provided in the upper body of the scanning unit (10) for detecting that the scanning unit (10) is at the movement start position.

FIG. 3 shows the control of the scanning motor (Ml) that moves the scanning unit (10) and the image forming motor (M2) that drives the image forming element in the scanning unit (10). (31) and (32) are drive circuits that drive the image forming motor (Ml) and scanning motor (M2), respectively;
31) stops or rotates the imaging motor (Ml) at a constant speed in response to an output signal from a microconbeater (hereinafter abbreviated as MC), and a drive circuit (32) controls the MC.
The scanning motor (M2) is rotated forward, reversed, and stopped by the output signal from the scan motor (M2), and is also rotated at a predetermined speed.

(33) and (34) are the respective motors (Ml) and (M
2) An encoder that oscillates pulses according to the rotation speed of (
35) and (36) are encoders (33).

This is a wave shaper that shapes the pulses from (34).

(37) is a frequency converter that converts the pulse signal from the imaging motor (Ml) that has been shaped by the waveform shaper (35), and (38) is a frequency converter that converts the pulse signal from the image forming motor (Ml) that has been shaped by the waveform shaper (35). This is a function oscillator that outputs a pulse signal whose width increases or decreases sequentially, and the pulse signals output from both are appropriately selected by a switching circuit (39), and one of the pulse signals is input to the MC. M.C.
is the pulse signal from the switching circuit (39) and the scanning motor (M2) shaped by the waveform shaper (36).
A signal for PLL control of the drive of the scanning motor (M2) is output to the drive circuit (32).

Further, the moving distance of the scanning unit (10) is obtained by counting the number of pulses from the encoder (34) within the MC after the home switch (S3) is turned off.

In addition, in the above explanation, the function oscillator (38
) and the selection of pulse signals in the switching circuit (39) are performed by signals from the MC.
This signal is arithmetic processed within the MC based on switches such as the print button, sensor (St), and sensor (S2) and the count value of the encoder (34) and is output. All of these methods use well-known methods,
The explanation will be omitted.

Next, the operations and speed changes of the scanning unit (10) and photosensitive drum (17) will be explained using FIGS. 2(a) to (d) and FIG. 4. Note that (a) in Figure 4 shows the photosensitive drum (
17) Speed change, (b) is the scanning unit) (10)
(A) to ('D) show the speed changes in Figure 2 (a) to ('D).
This corresponds to (d).

When the print button (not shown) is pressed, the mirror (9) described above moves to the dashed line position, and the image forming motor (
Ml) and the scanning motor (M2) start rotating. The photosensitive drum (17) and the scanning unit (10) are
As shown in Figure (a), the transfer paper P) is fed out from the paper feeder (12) and conveyed by the pair of conveyance rollers (13), and is eventually detected by the sensor (Sl). When the leading edge is detected, the transport roller pair (13) stops and the transfer paper (P) temporarily stops at the standby position. At the start of movement, the switching circuit described above (
In 39), a pulse signal whose pulse width gradually increases is selected from the 7 angulation oscillator (38), and according to the pulse signal, the scanning unit (10) gradually accelerates the pulse width from (A) to ). Move back and forth.

Scanning Unison) (10) or conveyance start position (Fig. 2 (b)
), a pair of transport rollers (
13).

(14) rotates to convey the transfer paper C), and the switching circuit (39) selects a signal from the image forming motor (Ml), and the scanning unit) (10) is transferred to the photoreceptor drum (C).
Scanning exposure is performed at a constant speed from (B) to (C) in synchronization with the rotation speed of step 17).

As the scanning unit (10) scans, the image on the microfilm (0) passes through the exposure sleeves l-(19) and is sequentially exposed to the photoreceptor drum (17) h, and after being developed by the image forming element, Transfer charger (19
) onto the transfer paper (P).

scanning unit) (10) is the scanning exposure end position (Fig. 2 (
C)), the signal is switched in the switching circuit (39) and output to the function oscillator (38).
The scanning unit (10) is gradually decelerated from (C) to υ) according to the pulse signal whose pulse width gradually decreases from Wait until discharge of ψ) is confirmed. Note that even when the scanning unit (10) is decelerating, the photosensitive drum (17) and the roller of the fixing device (11) are rotating at a constant speed.

When the sensor (S2) installed at the transfer paper ejection port in scanning unit (10) confirms that the transfer paper (P) has been ejected at @), the image forming motor (Ml) stops rotating. At the same time, the scanning unit (10) starts to move backwards,
As shown in (F) to (G), the copying operation is completed by returning to the movement start position (FIG. 2(a)) at a higher speed than during forward movement.

During this backward movement as well, the scanning unit (10) is gradually accelerated or decelerated from (c) to (g) and from (G) to (A') according to the pulse signal from the function oscillator (38).

As is clear from the above explanation, the photoreceptor drum (]7)
Since each image forming element arranged around the image forming element is integrally moved along the image forming plane and scanning exposure is performed in a state where the image is enlarged and projected, the influence of vibration can be minimized. can.

Furthermore, as shown in Fig. 4, the scanning unit) (10)
Since the speed change is trapezoidal with a gentle oblique side, there is no problem such as the developer inside it breaking up due to rapid acceleration.

Next, a second embodiment of the present invention will be described using FIGS. 2(a) to (d) and FIG. 5. Its configuration is almost the same as that of the first embodiment, with a sensor (S4) provided adjacent to the separation charger (22) as shown by the broken line in FIG. 2(a), and a pressure roller fixing device (11). It uses a container. Further, in FIG. 3, the drive circuit (31) is capable of changing the rotational speed in two stages by another signal from the MC, as indicated by a broken line.

Fig. 5 shows the speed changes of the scanning unit (10) and the fixing roller, and (2) shows the speed changes in this embodiment;
(b) shows the speed change of the scanning unit (10) in the first embodiment, and (c) shows the speed change of the fixing roller.

When the print button is pressed, the image forming motor (Ml) and scanning motor (M2) rotate in the same manner as in the first embodiment, and the microfilm (0) is transferred to the photoreceptor drum (17).
After the images are scanned and exposed and developed, they are sequentially transferred to a transfer charger (transfer paper Q) L. scanning unit) (10) is the scanning end position (Fig. 2 (C))
When it reaches , it gradually decelerates from G) to υ).

On the other hand, during the deceleration, a sensor (S4) detects that the trailing edge of the transfer paper (P) has left the photosensitive drum (17), that is, the transfer paper (P) has passed over the sensor (s4). When this is confirmed, the rotational speed of the image forming motor (Ml) is increased as shown in FIG. 5 (I), and the fixing operation is accelerated. In this embodiment, the fixing speed is twice that of exposure transfer.

Eventually, the scanning unit (10) stops at the movement stop position (Fig. 2 (d)), and the sensor (S2) installed at the transfer paper ejection port checks whether the transfer paper (P) is ejected. When it is confirmed that the paper has been ejected, the paper returns to the movement starting position in the same manner as in the first embodiment.

In this example, as shown in FIG.
) The waiting time (t1') until it is ejected is reduced by the waiting time (t1') of the first embodiment by speeding up the fixing of the transfer paper.
), resulting in a shorter copy cycle. Also, in this embodiment, the same effects as in the first embodiment can be obtained.

In the first and second embodiments, the fixing device (11) and the photosensitive drum (17) always rotate at the same timing, but they can be rotated separately using a clutch or the like or by providing a new motor. FIG. 6 shows a third embodiment of the present invention, in which the paper feeding device (12)
is fixedly provided outside the scanning unit (10'). At the same time as the print button is pressed, the paper feeder (
The transfer paper (P) sent out from 12) is transported by a pair of transport rollers (
13), and is conveyed without moving C as the scanning unit (10') moves. The following description is omitted because it is similar to the first and second embodiments. -1 In this device, the paper feeder (12) and the plurality of transfer papers (P) are lighter and lighter, and the scanning motor (M2)
This reduces the load and reduces power consumption.

Effects As will be clear from the following explanation, the present invention provides a transfer type electrophotographic reader printer in which a scanning unit is installed so as to be movable back and forth along the imaging plane of a film image obtained by an optical system. , at least one fixed device in the scanning unit, a transfer desk 11/J j space device, a photoreceptor drum, and a plurality of image forming elements arranged around the drum, and during the exposure process, the scanning Since the unit scans at a constant speed in synchronization with the rotational speed of the photoreceptor drum, it is possible to perform scanning exposure while projecting an enlarged image, and there is little influence from vibrations during scanning movement, achieving high resolution. be able to. Further, when a C pressure roller fixing device is used as the fixing device, the copying cycle can be shortened by increasing the rotational speed of the pressure roller after the transfer paper is separated from the photosensitive drum.

[Brief Description of the Drawings] Fig. 1 is a schematic diagram illustrating the optical system of a reader printer to which the present invention is applied, and Figs. 21 (a) to (d) illustrate the configuration and operation of the scanning unit according to the present invention. FIG. 3 is a block diagram showing scanning control of the scanning unit; FIG. 4 is a block diagram showing scanning control of the scanning unit;
FIG. 5 is a graph showing speed changes of the scanning unit and photosensitive drum in the first embodiment, and FIG. 5 is a graph showing speed changes of the scanning unit and fixing roller in the second embodiment.
FIG. 6 is a schematic diagram showing the structure of a third embodiment of a scanning unit according to the present invention. (2) Illumination system section, (3)...Optical system section, (10)...
Scanning unit, (11) fixing device, (12) and paper feeding device, (13). (14)・Transport roller pair, (17)・Photosensitive drum,
(19)・Exposure slit, (21)・Transfer charger, however) Scanning surface (imaging surface), (Ml)・Image forming motor, (
M2)・Scanning motor. Figure 3 Figure 4 Time (1) Figure 5 Continuation of page 1 0 Inventor Yasuhide Ogura Inside Azuchicho Camera Co., Ltd., Higashi-ku, Osaka City

Claims (1)

[Claims] 1. Transfer-type electrophotographic reader printer 1. A scanning unit is installed so as to be movable back and forth along the imaging plane of the film image obtained by the optical system, and a small At least a fixing device, a transfer paper conveying device, a photoreceptor drum, and a plurality of image forming elements arranged around the drum are provided, and the scanning unit is synchronized with the rotational speed of the photoreceptor drum during the exposure process. A reader printer that scans at a constant speed. 2. The scope of the claims characterized in that the fixing device is a pressure fixing device and the roller rotation speed of the fixing device is increased after the transfer paper is separated from the photoreceptor drum. A reader printer according to claim 1 or 2, characterized in that: