JPS60252372A - Copying machine - Google Patents

Abstract

PURPOSE:To obtain a copying machine which eliminates the loss of time of press scan after setting of an original and controls the length of scan exposure in accordance with the size of the original and uses effectively advantages of original automatic supply and automatic picture density control. CONSTITUTION:An optical part 2, a copy processing part 4, and a copy paper carrying part 3 are provided in a copying machine body 1, and an original supply device 5 is provided on the copying machine body 1, and an automatic picture density controller is provided which exposes the original before scan exposure of the original for formation of a copy picture on a copy paper and detects the density of the original to control the copy picture density. The automatic picture density controller is so constituted that the original is exposed to detect the original density by the optical part 2 during the original supply operation, and a sensor which detects the length of the original is provided in the upstream side of the scan exposure position of the original, and a control means is provided which sets the exposure time for original density detection in accordance with the length of the original detected by this sensor.

Description

[Detailed description of the invention]

TECHNICAL FIELD The present invention relates to a copying machine, and more particularly, to a copying machine equipped with a document feeding device and an automatic image density control device. <Prior Art> Conventionally, a document feeding device, J
There has been provided a copying machine equipped with an automatic image density control device whose purpose is to automatically obtain a decoded image having an optimum copy quality in correspondence with the original M image. FIG. 7 is a schematic diagram showing the interior of such a copying machine. (1') is the main body of the copying machine, the interior of which is divided into an upper chamber (12') and a lower chamber (13') by partitions &(11'). ) An optical section (2') for scanning haze light is provided, and in the lower chamber (13') there is a copy paper transport section (3') and a copy processing section that forms a copy image on the copy paper (P'). (4') is provided. Then, the document feeding device (
5') is installed. Here, the optical part (2') includes a light source (21'), a reflecting mirror (22') (23') (24'), and a lens (2').
5') and a reflecting mirror (26'), and a light source (21
') and reflectors (22') (23') (24')
This is a conventionally known configuration in which the document (D') on the contact glass (14') can be scanned and exposed by moving the document (D') in the direction indicated by the arrow A'. In addition, the copy paper transport section (3
') include paper feed rollers (31') (32'), paper feed paths (33') (34'), and registration rollers (35').
), feed roller (36'), paper feed conveyor (37'),
Heated fixing roller (38'), and discharge [1-ra (39')
')

[c Which paper feed [ ] - By selectively driving the paper feed cassette (16') or (17
``), a sheet of copy paper (P') is taken out, guided to the copying processing section (4'), where the toner image is transferred, and the toner image is heated and fixed by the heating fixing roller (38').
This is a conventionally known configuration in which the liquid is discharged onto a pedestal (18'). The copying processing section (4') includes a photosensitive drum (41') rotating in the direction indicated by arrow B- in the figure, a charger (42'), a developing device (43')
, transfer charge V (44'), separation charger (45')
), and a cleaner (46'), and a charging booth (42') is provided with a uniformly charged photoreceptor drum (J).
41') to form an electrostatic latent image, it is developed into a toner image by a developing device (43'), and the toner image is transferred to a copy paper by a transfer unit (44'). (P') and remove the remaining toner with a cleaner (4).
There is a conventionally known configuration in which the manuscript is collected by the document supplying device (5').
The conveyor belt (51') located at h and the copying machine body (1
'), the original table (52') located at the upper right in the figure;
A paper feed roller (53') that feeds the original (D') on the original platen (52') one by one, a conveyor belt (51') for transporting the original (D'), and one contact glass (14'). A conveyance roller (54') conveys toward between the conveyance belt (54') and a conveyance belt (
! ejection roller (55) that ejects the document (D') sent out from between the contact glass (14')
'), and sends out a large number of originals stacked on the original platen (52') one by one and guides them between the conveyor belt (51') and the contact glass (14'), The scanner is stopped at a predetermined position so that scanning exposure can be performed each time it is set, and after the copying of one original is completed, the original is ejected (I11) and the next original is loaded (C). As is clear from the above explanation, the document supply device (5')
Original document feeding is performed from the end side of scanning exposure to the start side. Although it is not clearly shown in the drawings, the automatic image density control device controls the scanning of the original document prior to scanning exposure for the copying operation.
The density of the original is read by the sensor υ shown in the figure (61'), and the output signal from the sensor corresponding to the density of the original is subjected to C processing by a Δ-reconverter, CPtJSD-A converter, etc. However, it provides the optimum developing bias or voltage applied to the light source, etc., and the operator does not need to perform any S degree setting operation, and can automatically control the image density to be optimum. If the copying machine has the configuration shown below, the operator only needs to stack the originals on the original table (52'), set the number of copies, and operate the print key etc. The document feeder (5') automatically supplies and sets the document,
After performing one scanning exposure, the density of the original is read and the development bias value or voltage applied to the light source is controlled, and then scanning exposure is performed again to copy the optimum image quality onto the copy paper (1)'). It is convenient to form images. However, while it is convenient, it requires scanning exposure (hereinafter referred to as prescan) to read the density of the original after the original is printed and before the first scanning exposure for forming a copy image. Therefore, pressing must be performed every time the original is set, and if the number of copies is small, the ratio of press 4: press time to the total copying time becomes quite large, so the overall copying operation is It will take a long time. This point is not much of a problem with copiers that make copies at normal copying speeds, but in high-speed copiers that copy at high speeds, there is one factor that greatly impedes the increase in speed, especially when copying from a single sheet of paper. This has become a major problem in that the copying speed when the number of copies to be made is small is considerably slower than the normal copying speed determined by the scanning exposure time and the like. In addition, in the conventional copying machine described above, the scanning exposure distance for reading the density of the original is set to a predetermined distance, such as the distance that covers the A4 size original (D') that is passed horizontally. Because of this, large-sized originals (D
')? If there is l', only a portion of the document (r)') can be scanned and exposed, and if it is a small document (r)'), not only the document (D') but also the transport bell h (51') can be scanned and exposed. Therefore, in either case, it is difficult to accurately read the document density. Furthermore, a paper feed roller (53'), a transport roller (54')
) and the drive stop timing of the conveyor belt (si') to position the original (D') (2) The original (D') must be accurately moved to the scanning exposure start position. <Purpose> This invention was made in view of the above-mentioned problems. In the past, we aimed to provide a copying machine that can control the IC scanning exposure distance depending on the size of the original, and also take advantage of the advantages of automatic document feeding and automatic control of both WASI. '〈Structure〉 The structure of the copying machine of the present invention for achieving the above object and t) includes an optical section, a copy processing section, and a copy paper conveyance section inside the copying machine main body, and an upper part of the copying machine main body. It has an original feeding device on the copy paper, and controls the density of the copied image by detecting the density of the original by exposing the original before scanning and exposing the original to form a copied image on the copy paper. The automatic image density control device is configured to set the document feeding direction by the document feeding device from the start side to the end side of scanning exposure, and set the automatic image density control device during the document feeding operation. The optical part is configured to expose the original to light and detect the density of the original, and a sensor for detecting the length of the original is installed one stream side from the scanning exposure position of the original. The present invention is characterized in that it is provided with a control means for setting an exposure time when detecting a melon in accordance with the length of an IC document. <Examples> Hereinafter, examples will be described in detail with reference to the accompanying drawings showing examples. FIG. 1 is a schematic diagram showing the internal structure of a copying machine according to the present invention. (1) is the main body of the copying machine (hereinafter abbreviated as the main body), the interior of which is divided into an upper chamber (12) and a bottom chamber (13) by a partition plate (11). , Manuscript (1
1) An optical section (2) for scanning exposure is installed, and a 5-part room (1) is installed.
3) is provided with a copy paper conveying section (3) and a copy processing section (4) for forming a copy image on copy paper (P). Then, the document feeder (
5) (hereinafter abbreviated as ADF) is provided. Here, the optical part (2) is a light source (21) consisting of a light emitter and a curved reflector, and a flat reflector (22).
(23) (24) , a lens (25), and a plane reflection mirror (26), and a light source (21) and a plane reflection #R
(22), (23), and (24) are configured to scan and expose the original (D) on the contact glass (14) by moving them in the direction shown by the arrows, but the configuration is not limited to this configuration. Instead, it is possible to use a conventionally known optical section with another configuration. In addition, the copy paper transport section (3) includes paper feed rollers (31) (32), a paper feed path (33),
) (34>, registration roller (35), conveyance roller (36), paper feed conveyor (37), attention to the heating chamber - (3
8) and a discharge roller (39), and by selectively driving either paper feed roller, a single sheet of copy paper (P )
The toner image is taken out, guided to a copying processing section (4), where the toner image is transferred, heated and fixed by a heating fixing roller (38), and then discharged onto a receiving table (18). However, the present invention is not limited to this configuration, and it is also possible to use a copy paper conveyance section having other conventionally known configurations, such as a configuration in which the paper feed side and the discharge side are on the same side. In addition, the photosensitive drum (41), which is rotated in the direction shown by arrow B in the figure, is charged with an electric charge.
= (42) Image device (43), transfer charger (44)
), minutes - [charger (45), and cleaner (46
) are arranged in this order, and a document image is formed on the outer surface of the photoreceptor drum (41), which is uniformly charged by a charging charge t (42). The toner image is developed into a dot image by a device (43), the toner image is transferred to copy paper (total) by a transfer jet r (44), and the residual toner is cleaned (46) and collected. However, the configuration is not limited to this configuration, and for example, a configuration using a belt-shaped photoreceptor, copy paper (P
) It is also possible to use a copy processing section of other conventionally known configurations, such as one that forms an electrostatic latent image directly on soil. AD (5) has a contact glass (14) inside a casing (50) attached to the top surface of the main body (1).
The conveyor bell 1-(51) is provided so as to be located above, and the original placing table (52) is provided above the scanning exposure start side of the copying machine body (1) (upper left h in the figure). ) above the paper feed roller (53) that feeds the document (D) one sheet at a time.
A conveyor roller (54) for conveying the document (D) and a sensor (for applying force) for detecting the length of the document (D) are installed between the document placement table (52) and the conveyor belt (51). A discharge [1-ra' (55) and a discharge] are provided on the scanning exposure end side (right side in the figure) to discharge the document (r) sent out from between the conveyor belt (51) and the contact glass (14). The guide plate (56) that guides the original document (D>) toward the top of the casing (50) is set at the number, and the original document (D) that has been taken out only by the paper feed roller (53) is transferred to the conveyance roller. (5
4) between the conveyor belt (51) and the contact glass (
14) while guiding the original (
D) is detected and positioned at a set position for copying operation so that scanning exposure of the original (D) can be performed.After the scanning exposure is completed, the original (D) is conveyed to the right in the figure. By feeding, the casing (50
), but it is not limited to this configuration; for example, various configurations may be used, such as one in which the document ([)) is directly discharged to the right of the conveyor belt (51). can be used. . However, the direction in which the document is fed from the document table (52) must be from the scanning exposure start position of the optical section (2) to the scanning exposure end position. FIG. 2 is a block diagram showing the relationship between the A D F (5) and the main body (1) side. While applying the force output signal, A D
F (applying a signal indicating the operating state of 51, Δl) F
A control signal for controlling (i) is output via the I10 port. Also, in the micro-viewer (63) on the main body (1) side,
The output signal of the sensor (61) installed at a predetermined position in the optical path (L) of the reflected light from the document (D) is applied, avoiding the interposition of the I10 boat, and the operation state of the main body (1) is indicated. A control signal to control the main body (1) and a signal to stipple the light m (21) are interposed (outputted) through the I10 port.Furthermore, both microcomputers (
62063), an I10 boat is interposed between C
1 microcomputer (62), A D F (
5) The operation signal, automatic exposure sampling start signal, and automatic exposure sampling stop signal are sent to the microcomputer (63
), and the microcomputer (63) transmits a ready signal indicating an operable state, an automatic exposure t-tod signal, and an original exchange signal to the microcomputer (62). In addition, (64) is a display part for AI)-(5), and (65) is a display part for main body (1). The operation timings of the optical section (2), the copy paper transport section (3), the copy processing section (4), the 80 F (5), the control means, and the automatic image WJ melon control device are first A.
Activate D F (5) and place the original (D) on the original platen (5).
2) While transporting the person to the specified position,
C. The sensor (detects the document (1)) by force, and integrates the document detection signal output time using the counter (71). After detecting the edge of the document (1), if a predetermined time elapses, the optical section (2) without moving the light source (21).
) is turned on, and this lighting time is controlled to be equal to the v4n value by the counter (71), and the sensor (61
) to sequentially read the entire area of the document (D) and automatically create image 1.
Once the control device detects the density of the original (D), a developing bias potential or a voltage for light m (21) corresponding to this detection signal is applied. Further: After the sensor (force) outputs a document non-detection signal, by driving the conveyor belt t (51) for a predetermined period of time, the edge of the document ([)) is accurately positioned at the scanning exposure start position. After that, move the optical part (2) in the direction shown by the arrow to scan and expose the -Ci manuscript (D),
The photosensitive drum (4) is moved in synchronization with the moving speed of the optical section (2).
1) in the direction shown by arrow B, and the copy paper (P) is further moved toward the left in the figure by the copy paper transport section (3), thereby making it possible to perform normal copying operations. . Next, the operation of the copying machine having the above structure will be explained in detail using the 7O chart in FIGS. 3 and 4. First, the operation of the A D F In step ■, the presence or absence of the document (D) is determined, in step ■, the presence or absence of the ready signal from the main body (1), and in step ■, it is determined whether the A D F start switch is ON or OFF. Step ■ - It is determined that there is a document (D>) by smell, and Step ■
It is determined that there is a ready signal from the main unit, and it is determined that the start switch of 80 is turned on. In step C, it is determined whether or not the main body is in automatic exposure mode, and if it is in automatic exposure mode, step
Start conveying the document (1)), hold until the sensor (7) outputs the document detection signal at step 3, output the document detection signal, and then adjust until the start of automatic exposure zumbling in step 3. Counting is started, and in step 2, the count value reaches the set value. When the count value reaches the set value, an automatic exposure sampling start signal is transmitted to the main body in step 2,
After holding the sensor (force) until it outputs a document non-detection signal in step ①, the adjustment count starts until the automatic exposure sampling stops in step @Oi-C, and
In step [phase], a count is started until the document conveyance is stopped. Then, in step ■, after the count until the automatic exposure zumbling stops reaches the set value, the automatic exposure sampling stop signal is transmitted to the main body in step ■, and in step [phase], the count until the document feeding stops reaches the set value. After holding the original (D) until it reaches , the conveyance of the original (D) is stopped in step 0, a print signal is transmitted to the main body in step [phase], and AD and F are held in a wait state in step [phase]. Then, in step [phase] J3, hold until the document exchange signal from the main unit is received = (, step ■ Odor C original (D)
Determine the presence or absence of. Then, if there is a document (D), in step [phase], the C conveying belt (51) is driven.
After discharging the Kyoto draft (D), the determination process from step (2) onwards is performed. On the other hand, if there is no document (D), a reset of the ADF operation signal is transmitted to the main body in step 0, and after the document (D) is ejected in step [phase], the determination processing from step 2 onwards is performed. Furthermore, if it is determined that the automatic exposure mode is not set in step (2), the conveyance of the document (D) is started in step (2), and after holding the document (D) until the sensor (D) outputs a document detection signal in step [phase], the document (D) is held until the document (D) is outputted in step Phase 4 is held until the document non-detection signal is output until the document non-detection signal is output. Then, in step C @, counting is started until the document conveyance is stopped. Thereafter, the determination process in step [phase] and subsequent steps is performed. The action of the main body (1) is as shown in FIG.
After waiting until the camera becomes ready (ready state), a ready signal is transmitted to the ADF in step (3), and it is determined in step [phase] whether or not it is in automatic exposure mode. and,
If in automatic exposure mode, A D F in step ■
If the automatic exposure mode is not in the automatic exposure mode, step
', it is determined whether the ADF operation signal transmitted from the ADF is set or not. Then, if the A D F operation signal is hit, it is determined again in step [phase] whether or not it is in automatic exposure mode, and if it is in automatic exposure mode, the automatic exposure sampling signal is set in step [phase]. After holding it until the light source (21) is turned on, in step [phase]
In step [phase], the sensor (61) performs an exposure amount reading operation, and the operation in step (2) is performed until it is determined that step [phase] is +15 and an automatic exposure sampling stop signal is set. When the automatic exposure sampling stop signal is set, the light source (21) is turned off in step 0, and the print signal from the ADF is held until the number is received in step [phase]. On the other hand, if it is determined that it is not the automatic exposure mode, the determination processing from step [phase] to step [phase] is omitted, and the process continues until the print signal from ΔDF is received in step @. After receiving the print signal from the ADF, the copying operation of the main body is performed in step (2), and the operation of step (2) is performed until it is determined in step O that the copying operation has been completed. Then, when the copying operation is completed, in step 0, the UAD
It is determined whether or not the F operation signal is set and -C is set. If it is set, a document exchange signal is transmitted to the ADF in step O, and the determination processing in steps [phase] and below is performed, and if it is reset, , directly performs the determination processing in step 910 and above. Furthermore, if it is determined in step [phase] that the ADF operation signal is reset, it is determined in step (2) whether or not the main body is in a state where copying operation is possible. It is determined whether the mode is automatic exposure mode or not, and if the mode is automatic exposure mode, a prescan operation is performed in step ■, and then step ■
The following determination processing is performed. Further, if it is determined in step [phase] that copying is not possible, the determination processing in step [phase] and subsequent steps is performed. With the above configuration, the original (by A D F (51)
The sensor (71) detects the length of the document (D) while the document (D) is being conveyed, and the light source (21) detects the degree of IjA over the entire length of the document (D). This makes it possible to perform accurate density detection, and also eliminates the independent time required for press 4:1!, making it possible to perform copying operations at high speed. This does not compromise the advantage of eliminating the need for control of thinning. In addition, since the edge of the document ([) is detected by a sensor (sword) and the conveyance operation is stopped after a predetermined period of time has elapsed, the document ([)
)) can be determined accurately. It should be noted that the present invention is not limited to the above-described embodiments; for example, a probe for detecting the surface potential of the photoreceptor can be used as the sensor (61), and the position of the sensor (61) may also be modified. is in the optical path, the lens (25
) Can you freely choose between the upstream side and the downstream side? Also, as shown in Fig. 5, a Nislit (15) is provided on the upstream side of the document (D) transport with respect to the contact glass (14), and a glass made of the same material and the same thickness as the contact glass is arranged. As shown in FIG. 6, at the beginning of supplying the document (D), the optical section (2) is slightly moved in the scanning exposure direction (direction indicated by the arrow) (below the edge of the touch glass). It is possible to detect the density of the original (D) when the original (D) is moved up to
J3"C within the scope of not changing the gist of the invention.
It is possible to create a variety of installations. <Effects> As described above, the present invention provides a copying machine with a document feeder and an automatic image I! If the camera is equipped with a control device and the feeding direction of the original is set from the scanning exposure start side to the scanning exposure path r side, a lens for detecting the length of the original is stepped and the total length of the original is set. By providing a control means for setting the exposure time in accordance with While having the advantages of automatically supplying C1 and automatically setting the temperature of the copy image, it also has the unique effect of reducing the time required for copying by eliminating the need for separate time for detecting the density of the C1 original. play. Furthermore, if the control means is also provided with a document positioning function, it is possible to accurately position the document.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the internal mechanism of an embodiment of a copying machine, and FIG. 2 is an automatic image density control device, A3 and exposure time settings,
The block diagram does not show the control means for positioning the document;
The figure shows the operation of the document feeder (5).
Fig. 4, No. 1, does not show the action of the copying machine main body side.
17-, FIG. 5, and FIG. 6 are schematic diagrams of main parts showing other embodiments of a copying machine, and FIG. 7 is a schematic diagram showing a conventional copying machine. (1)... Copying machine body, (2)... Optical section, (3)
)... Copy paper transport section, (4)... Copy processing section, (5
)...Original supply device, (14)...Contact glass, (15)...Slit, (21)...Light source, (
D)...Manuscript, (P)...Copy paper. Patent applicant Sanda Kogyo Co., Ltd.

Claims (1)

[Claims] 1. An optical section, a copy processing section, and a copy paper transport section are provided inside the copying machine main body, a document feeding device is provided at the top of the copying machine main body, and a copy image is formed on the copy paper. It has an automatic image density control device that controls the copy image by exposing the original to light and detecting the density of the original before scanning the original for scanning, and the original feeding by the original feeding device described above. The scanning exposure direction is set from the start side to the end side of scanning exposure, and the automatic image density control device is configured to detect the density of the original by exposing the original using an optical section during the original feeding operation. A sensor for detecting the quality of the original is provided upstream of the operational exposure position, and a control means is provided for setting the exposure time when detecting the density of the original in accordance with the length of the original detected by the sensor. A copying machine with many features. 2. The copying machine according to claim 1, wherein the control means positions the document five times. 3. The copying machine according to claim 1 or claim 2, which is an automatic image density control device that exposes the original to light at the end of the contact glass on which the original is set and detects the density of the original. 4. The copying machine according to claim 3, wherein the contact glass extends above the stop position of the light source constituting the optical section. 5. The copying machine according to claim 3, wherein the light source moves to a position below the end of the contact glass as the original is fed. 6. Provide a slit for light transmission at a position away from the contact glass on which the original is placed, and insert J3 into this slit.
3. The copying machine according to claim 1, wherein the copying machine is an automatic image density control device that exposes a document to light and detects the density of the document.