JPS6127532A - Exposure scanner of electronic copying machine - Google Patents

Abstract

PURPOSE:To curtail the number of parts, and to reduce the cost of a titled device by providing a sensor on a going-motion start point and an exposure start point of an exposure scanning means, and applying the brake to the exposure scanning means based on passing of the exposure tstart point as a reference, when the return-motion is executed. CONSTITUTION:A holding body 54 of an exposure lamp 10 is driven by a belt 55 along a guide bar 53, and the belt 55 is driven by a servo-motor 56 and an idler 57, and brings a lamp 10 to a reciprocating motion. The holding body 54 has two light shielding plates 58, 59, and turns off and on photocouplers (FC)60- 62. When a copying machine is started, the lamp 10 of a fixed position is brought to a going-motion in the NF direction, the light-shielded FC60 is turned on, the lamp 10 is lighted, the FC61 is light-shielded 59, and an exposure scan is started from the tip of an original. When the FC62 is light-shielded, a motor 56 is converted to a reverse rotation, the lamp 10 is turned off, and it is brought to a return-motion in the NR direction. When the FC61 is light-shielded, based on it as a reference, the holding body 54 is braked and stopped. In such a way, the number of parts is curtailed, and the cost is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to an exposure scanning device for an electronic copying machine in which a light source moves or a document table moves.

(b) Conventional technology Conventional exposure scanning devices of electronic copying machines (for example, Japanese Patent Application Laid-open No. 1986-
(as shown in Japanese Patent No. 118672), the exposure scanning means is provided with at least first and second detected members, and along the scanning locus of the exposure scanning means, the forward movement start position of the exposure scanning means, Detection means such as photointerrupters are provided in the vicinity of the image exposure start position, the backward movement start position, and the braking start position during the backward movement, and operate as follows.

First, during forward movement, a first detected member is detected by a first photointerrupter provided at a forward movement start position,
Thereafter, exposure scanning of the original image can be started by being detected by the second photo-in crack provided at the image exposure start position. stop.

When the first detected member is detected by a third photo-interrupter provided near the return movement start position,
After the exposure scanning means is braked and once stopped, the backward movement is started. Next, the second detected member is fully detected by the fourth photo-interrupter provided at the braking start position during the backward movement, so that the exposure scanning means is braked and stopped at the fixed position.

Therefore, in this conventional technique, photointerrupters are provided at the image exposure start position of the exposure scanning means and at the braking start position during the backward movement.

(c) Problems to be Solved by the Invention As mentioned above, in the conventional technology, a large number of detection means are provided on the scanning locus of the exposure scanning means, so the number of parts of the detection means increases, and Wiring became complicated, leading to higher prices for electronic copying machines.

(d) Means for solving the problem The present invention provides a detection means that is provided at least at a forward movement start position and an image exposure start position of the exposure scanning means, and when the exposure scanning means moves backward after exposure scanning, -C is detected by the detection means provided at the image exposure start position of the detection member;
The exposure scanning device for an electronic copying machine is characterized in that a braking start position of the exposure scanning means is controlled based on the detection position.

(e) Function In the present invention, since the detection means provided at the image exposure start position of the exposure scanning means is also used as the detection means provided at the braking start position during backward movement, either one of the detection means is used. means are no longer necessary.

That is, during the backward movement, the detected member can be detected by the detection means provided at the image exposure start position, and the braking start position of the exposure scanning means can be controlled based on the detection position.

Embodiment FIG. 1 is a perspective view showing an electronic copying machine in which the present invention is fully implemented, and FIG. 2 is a front view showing its internal structure. Following these figures, the structure of this electronic copying machine will first be explained.

(1) is the main body of the copying machine. On the top surface of the main body (1) of the copying machine, a document table (2) made of a transparent glass plate is fixed. On the top of this document table (2), an automatic Original transport device (3
) is attached with hinges (4) (4) so that it can be opened and closed. On the right side of this automatic document feeder (3), there is provided a document tray (6) on which the original document (5) before copying is placed, and on the left side, there is provided a tray (7) on which the original document after copying is placed. ) are provided.(8)... are rollers for conveying the original (5), and (9) is a belt.

Below the document table (2), an exposure lamp (10) serving as an exposure and scanning means for the document is provided so as to be movable in the horizontal direction. The mirror (11) is completely attached.

Further, a first movable mirror (12) is fixed to this reflecting mirror (11). When the exposure lamp (10) scans forward to the right, the original (5) is completely exposed to the slit, and the speed is VF. Further, when the exposure lamp (10) performs backward scanning to the left, the original (5) cannot be fully exposed, and the speed is VR. Note that a means for detecting the exposure lamp (10) is provided along the scanning locus of the exposure lamp (10), and this point will be described later.

(13) and (14) are a pair of second movable mirrors that reflect the original image reflected by the first movable mirror (12) again toward the image lens (15). This second movable mirror (1
:1) (14) is 1 of the scanning speed of the exposure lamp (10)
/2 speed, that is, VF/2 or VR/2, in the same direction as the exposure lamp (10).The imaging lens (15) is a zoom lens that can change the copying magnification. It has been configured.

To the right of the imaging lens (15) is this lens (15).
) is provided with a fixed reflecting mirror (17) that reflects the original image transmitted through the photoreceptor drum (16). (
18) is an infrared absorption filter.

On the upstream side of the exposure position of the photoreceptor drum (16), there is a zide erase for removing (site erase) the electric charge on the portion of the photoreceptor drum (16) corresponding to the side edge of the copy paper (19). A charging corotron (21) for uniformly positively charging (approximately 600 V) the photoreceptor drum (6) is installed on the upstream side of the site lamp (20) where the lamp (20) is installed. It is permanently installed.

On the downstream side of the exposure position of the photoreceptor drum (16), an electrostatic latent image formed by a charging flotron (21), an exposure lamp (10), and an imaging lens (15) is developed with toner. A developing device (23>) is provided for this purpose.This developing device (23) is provided with screw container hairs (22) and (24) for stirring carrier and toner.(25) is a developing device (23). (23) is a toner storage container that supplies toner, and is configured to be able to swing back and forth about a support shaft (26) as a fulcrum.

A photosensitive drum (1) is provided downstream of the developing device (23).
6) A transfer corotron (27) is provided to transfer the above toner image onto copy paper (19), and this transfer corotron [1
A separating corotron (28) that separates the copy paper (19) from the photosensitive drum (16) is installed downstream of the photosensitive drum (27), and both corotrons (27) and (28) are integrally connected to the photosensitive drum. The body drum (16) is configured to be able to approach and separate from the body drum (16).

(29) is a lower paper feed cassette which is removably attached to the inner bottom of the copying machine body (1) and stores A3 size copy paper 19). The paper feed cassette (
A compression spring (30) and a support plate (31) for pressing the copying paper 19) upward are provided at the inner bottom of the paper feeding force cera) (29). The uppermost copy paper (19) is pressed against a rotatably provided paper feed roller (32). (33) is an upper paper feeding power set similar to the paper feeding cassette (29), and A4 size copy paper (19) is stacked and stored inside. Reference numeral (34) denotes a manual paper feed tray, which enables manual paper feeding by rotating it clockwise. The copying machine body (1) is provided with a sensor (not shown) that detects the size of the copy paper (19) in the paper feed cassette (29)<33).

Along the photoreceptor drum (16), a transfer corotron (2
7) is equipped with a cleaning device (35) for removing toner that has not been completely transferred and remains on the photosensitive drum (16). This cleaning device (35) includes a blade (36) made of comb that scrapes off the residual toner on the photoreceptor drum (16), and a blade (36) that removes the residual toner scraped off by the blade (36). Screw conveyor (38) carrying out toner storage box (37)
And it's decorated.

Further, upstream of this cleaning device (35), a static elimination lamp (39) for removing residual charges on the photoreceptor drum (16) is provided, and downstream of this static elimination lamp (39), A corotron (21) is located there.

A vacuum conveyor (41) for conveying the copy paper (19) on which the toner image has been transferred to the fixing device (40) is provided on the horizontal downstream side of the separation corotron (28). .

The fixing device (40) includes a heat roll (43) that has a built-in heater (42), and a heat roll (43) that has a built-in heater (42).
A pressure roll (44) that is brought into pressure contact with the copy paper (19) is installed, and the unfixed toner is heated and pressed by both rolls (43) and (44) to be fixed on the copy paper (19). <45) (46) is a pair of paper ejection rollers that ejects the copy paper (19) after fixing onto the paper ejection tray 47). (48> is an oil supply member 1 that supplies silicone oil to the heating roller (43).

(49) is a control box with control parts (50) inside, and (51) is an exhaust fan. Also,(
52)... is a numeric keypad for setting the number of copies.

FIG. 3 is a perspective view showing the exposure lamp (10) and its driving section, which are the essential parts of the present invention. In these figures, (53) is a guide bar extending in a direction parallel to the scanning direction of the exposure lamp (10), on which the holder (54) of the exposure lamp (10) is slidably attached. . Further, this holding body (54) can be connected to a belt (55) that drives it in the scanning direction by means not shown, and this belt (54)
5) is connected to the rotating shaft of the DC servo motor (56) and the idler (57).

Two light-shielding plates (58) and (59) are fixedly installed at one end of the holder (54) as members to be detected that cross the optical axis of a photointerrupter, which will be described later.

(60) (61) (62) are the above-mentioned exposure (10)
The first photointerrupter (60) is a photointerrupter provided along the scanning locus of the exposure lamp (60).
10), the second photointerrupter (61) is at the image exposure start position (IP), and the third photointerrupter (62) is at the backward movement start position (RP).
) (positions closer to the IP side).

When the operator operates the copy start switch, the exposure lamp (10) is initially stopped at the home position (HP), and the -X light shielding plate (58) is moved to the first photo interrupter (60). ) begins to move forward.Next, the front edge (59a) of the other light shielding plate (59) shields the second photointerrupter (61), and the exposure lamp (10) lights up and the original is exposed and scanned, and this other light-shielding plate (59) is connected to the third photo-interrupter (62).
), the brake is applied to the DC servo motor, and the exposure lamp (10) is turned off and stopped. Thereafter, the exposure lamp (10) starts to move forward, and the rear edge (59b) of the other light shielding plate (59>)
When the photointerrupter (61) is shielded from light, this second
A timing signal for applying the brake is output from the photointerrupter (61), and the braking start position of the exposure lamp (10) can be controlled based on this output. In this embodiment, as shown in FIG. 4, after the second photointerrupter (61) (IP during forward movement) is shielded from light during the backward movement, braking is started at a position where the second photointerrupter (61) has moved backward by a distance X. Ru. Thereafter, the exposure lamp (10) stops at the home position (HP). In addition,
Since the light shielding plate (59) has a long radius in the direction parallel to the scanning direction, the second photointerrupter (61) has a relative distance between the forward and backward movements. The light will be blocked at a position that is far away.

Furthermore, the scanning speed VR during the backward movement of the exposure lamp (10) is
Since the distance X varies depending on the copy size and the magnification ratio, the distance X can be changed depending on the copy size and the magnification ratio. The table below shows the relationship between the copy size, variable magnification, and distance X.

Margins Below As can be seen from this table, the distance X becomes shorter as the copy size becomes larger and as the magnification ratio becomes larger. This means that the larger the copy size, the more
Further, as the magnification ratio increases, the scanning speed becomes faster, and therefore, the exposure lamp 0) must be braked at an earlier stage.

FIG. 5 is a block diagram showing an outline of the circuit configuration of this embodiment, in which (63) is a microprocessor, (64) is various types of memory 1. (65) is an interface, which is an IF detection circuit (
66) is connected to the microprocessor (63) and memory (64) via the interface (65). Further, the DC servo motor (56) is connected to the interface (65) via its controller (67).
It is connected to the.

Next, the operation of this embodiment will be further explained based on the flowchart shown in FIG.

First, as described above, when the operator operates the copy start switch, the exposure lamp (10) moves forward until the forward movement IF (second incluctor (61)) is detected, and then the forward movement continues. Once this is completed, the return movement will begin. And I at the time of return movement
When the second ink lamp (61>) is detected, the return movement continues for a further distance X, and then the exposure lamp (10)
braking is started, and HP (first interrupter (60)
) is detected, the exposure lamp (lO) is stopped.

Note that in this embodiment, the document table is fixed and the exposure lamp is movable, but in the present invention, the exposure lamp is fixed and the exposure lamp is movable.
It can also be applied to a type in which the document table moves.

Furthermore, as the detection means, a microswitch or a magnetic sensor can be used in addition to a photointerrupter.

(G) Effects of the Invention In the present invention, the detection means is provided at least at the forward movement start position and the image exposure start position of the exposure scanning means, and when the exposure scanning means moves backward after exposure scanning, the detected member is The image exposure start position is detected by the detection means provided at the image exposure start position, and the braking start position of the exposure scanning means can be determined based on the detection position. There is no need to provide a photo interrupter at the braking start position and at the braking start position during the backward movement.

Therefore, the number of parts can be reduced and the wiring work can be simplified, and the cost of the electronic copying machine can be reduced.

[Brief explanation of the drawing]

Each of the drawings shows an embodiment of the present invention, and FIG. 1 is an overall perspective view of an electronic copying machine, FIG. 2 is an internal configuration diagram thereof, FIG. 3 is a perspective view of main parts, and FIG. 4 is an exposure lamp. 5 is a block diagram showing an outline of the circuit configuration, and FIG. 6 is a flow tilt diagram. (1)...Electronic copying machine body, (2)...Document stand, (1
0)・Exposure lamp, <12)...First movable mirror, (54
)...Holding body, (55)...Belt, (56)...
- DC servo motor, <58) (59) - Light shielding plate (detected member), (60) (61) <62)... Photo interrupter (detection means). -4i1- Ward 1 Proceeding Amendment (Spontaneous) August 2Z, 1980 1, Incident indication 1981 Patent Application No. 149917 2, Title of invention Exposure scanning device 6 of electronic copying machine, making amendments Relationship with the Patent Case Patent Applicant Name (188) Sanyo Electric Co., Ltd. 4, Agent Address 2-18-5 Keihan Hondori, Moriguchi City, Subject of Amendment (1) “Detailed Description of the Invention” in the Specification column. (2) Figures 4 and 6 of the drawings. (1) On page 11 of the specification, from line A14 to line A17, the words ``then...exposure scanned'' were replaced with ``
At the same time, the exposure lamp lights up. Next, the front edge (591) of the other light shielding plate shields the second 7-way interrupter @υ, so that exposure scanning is started from the leading edge of the document. (2) In the first line of page 12 of the specification, the statement "has started forward motion, and..." has been corrected to "has started backward motion, and...". (3) The table on page 15 of the specification is amended as follows. Below, in margin (4), page 14, line 5 of the specification, "scanning speed" is corrected to "return scanning speed." (In the 14th page, line 13 of the 51 specification, "connected to a microprocessor or memory (goods)" is corrected to ``connected to a microprocessor''. (61 specification, page 15, line 1) "Until (second interrupter 11)) is detected" is replaced with "until (second interrupter 11)) is detected."
interrupter @) is detected, and then the third interrupter is detected.'' (7) Figures 4 and 6 of the drawings will be corrected as shown in the attached sheet. Figure 4 1 ■ Ichimo

Claims (1)

[Scope of Claims] 1. A document table on which a document is placed, a means for exposing and scanning the document on the document table, a means for controlling the scanning speed of the exposure and scanning means, and a device provided in the exposure and scanning means. A detected member;
Exposure scanning of an electronic copying machine equipped with a plurality of detection means provided along the scanning locus of the exposure scanning means for detecting the position of the exposure scanning means by detecting the detected member. In the apparatus, the detection means is provided at least at a forward movement start position and an image exposure start position of the exposure scanning means, and when the exposure scanning means moves backward after exposure scanning, the detected member is provided at the image exposure start position. 1. An exposure scanning device for an electronic copying machine, wherein a braking start position of the exposure scanning device is controlled based on the detected position. 2. Claim 1, in which the detection means is constituted by a photointerrupter, and the detected member is constituted by a light shielding plate.
An exposure scanning device for an electronic copying machine as described in 1. 3. The exposure scanning device for an electronic copying machine according to claim 1 or 2, wherein the detection means is also provided near the backward movement start position of the exposure scanning means.