JP2001075328A - Color image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color image forming device with a simple constitution and a superior ability to be maintained. SOLUTION: In this device, discriminating display labels indicating color of stored toner or direction of loading to a frame body 51 are installed to each of the 4 pieces of image forming units 1Bk, 1C, IM and 1Y in places that can be seen from above when a cover 46 on a top surface of the device is in an opened state, and it is constituted so that the units are able to be extracted to a frame body from a lid part on a top surface of the device only in a state when the discriminating display labels are faced upward. Thus, an exchange operation can be carried out while confirming the color of stored color toner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a color printer,
The present invention relates to a color image recording apparatus applicable to a color copying machine, a color facsimile, and the like.

[0002]

2. Description of the Related Art In general, in order to form a color image by electrophotography, a method of forming a color image by superposing toner images of yellow, magenta, cyan, and black on a transfer material has been adopted. As a method of forming a color image, the present inventors disclosed in Japanese Patent Application No. Hei 5-178998 a method in which a plurality of image forming units corresponding to colors were sequentially moved in an apparatus, and a transfer material was sequentially moved at a single image forming position. And a method of forming a color image by transferring images of different colors to each other.

[0003]

In this method, since each color image is formed at a single image forming position, a required exposure optical system is provided as one set, and the apparatus configuration is simplified. Since the image forming unit can be integrally inserted into and removed from the apparatus and replaced, the method has a great advantage in terms of improvement in maintenance, which is the biggest problem of the electrophotographic apparatus. However, in such an apparatus, since the image forming units of each color have substantially the same shape, when the image forming unit is inserted / removed for maintenance / inspection / repair of the apparatus, the type of the unit and the type of the image forming unit in the apparatus. There has been a problem of erroneous insertion in which a combination of places where different types of units are to be stored is mistakenly inserted.

The present invention proposes a new configuration for preventing such erroneous insertion of the image forming unit.

[0005]

A color image recording apparatus according to the present invention comprises a plurality of individual units each having a toner accommodating section arranged in a substantially cylindrical shape, and is configured to be detachable from an opening / closing section on an upper surface of the apparatus. The identification display unit has a rotating body that is configured to be rotatable in a state always located on the outer peripheral side, the image formed on the photoconductor at the image forming position, via the intermediate transfer body,
A color image recording apparatus for transferring to a recording sheet, wherein each of the plurality of individual units has an identification display section indicating a color of toner stored in a toner storage section or a mounting direction to the rotating body, the identification display section being provided on an upper surface of the apparatus. When the opening / closing part is in an open state, it is arranged at a place visible from above, and is configured to be able to be taken out from the lid on the upper surface of the apparatus to the rotating body only with the identification display part facing upward. And According to this configuration, when an individual unit is replaced for toner consumption or maintenance, the individual unit of the wrong color is not mounted at an incorrect position in the apparatus, and the user can easily perform maintenance of the apparatus. It can be carried out. Particularly, since the replacement of the developing unit is performed only in a state where the opening is disposed above, the replacement operation can be performed while confirming the color of the stored color toner. Accordingly, it is possible to obtain a color image recording apparatus having a small, simple, and easy-to-maintain developing unit. The individual unit of the present invention is a state in which a plurality of individual units having a toner storage unit are collectively arranged in a substantially cylindrical shape, are configured to be detachable from an opening / closing unit on the upper surface of the apparatus, and the identification display unit is always located on the outer peripheral side. A color image recording apparatus that has a rotating body configured to be rotatable and transfers an image formed on a photoconductor at an image forming position to recording paper via an intermediate transfer body. In the unit, an identification display unit that indicates the color of the toner stored in the toner storage unit or the mounting direction to the rotating body is disposed at a location visible from above when the opening / closing unit on the upper surface of the apparatus is in an open state, The unit main body is configured so that it can be taken out of the rotating body via the lid on the upper surface of the apparatus only when the identification display unit is directed upward. According to this configuration, when replacing individual units for toner consumption or maintenance, each individual unit can be surely mounted at a predetermined position in the apparatus. Therefore, an individual unit with good maintenance can be obtained.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A color image recording apparatus according to a first embodiment of the present invention is formed so that the shaft side is formed smaller than the outer peripheral side, stores color toner in advance, and supplies the stored color toner to the outside of the unit. A plurality of columnar individual units of the same shape having a single opening are collectively arranged in a substantially columnar shape around a shaft provided in the apparatus main body, and the opening is always positioned around the shaft in a state of being located on the outer peripheral side. A rotating body having a housing that is rotatable and detachably supports the axis in a direction perpendicular to the axis, and an image forming unit that forms a color image on the photoconductor,
An intermediate transfer unit that is arranged to face the photoconductor and that contains an intermediate transfer member that sequentially transfers color images of each color from the photoconductor, and after transferring the color images of all colors to the intermediate transfer member, A transfer unit for transferring a color image from a transfer body to a recording sheet; a fixing unit for fixing the color image on the recording sheet after the transfer is completed; and An opening / closing unit that is smaller than the above and is configured to be able to selectively replace only the columnar individual unit requiring replacement, and rotating the rotating body to replace the columnar individual unit requiring replacement directly below the opening / closing unit. Moving means arranged at a position, wherein the columnar individual unit is arranged such that the opening is located laterally in the developing position, and the opening is located upward in the replacement position. A color image recording apparatus configured to be detachable from the opening / closing section on the upper surface of the apparatus only when the opening is turned upward when the columnar individual unit is replaced when the columnar individual unit is replaced. And the storage unit has an identification that specifies the color and the mounting direction of the color toner stored or to be stored at a location visible from above at the replacement position, and the color and the mounting direction of the color toner are It has a concavo-convex portion or shape that can be normally mounted only when it is correct, and when the columnar individual unit of a specific color is not normally mounted in the correct accommodation portion, the opening and closing portion does not close, and the device operation is performed. Use a configuration that does not start.

In the color image recording apparatus according to the second embodiment of the present invention, in the above-mentioned configuration, the identification display of the columnar individual unit includes an identification display for specifying the color of the stored color toner and an identification display for specifying the mounting direction. A configuration that also serves as a display is adopted.

Further, the color image recording apparatus of the present invention may have the following configuration. The present invention includes an electrostatic image carrier that rotates at least and a developing unit that has a toner of a different color, and can form toner images of different colors on the electrostatic image carrier, A plurality of image forming units, transfer means for transferring the toner image on the electrostatic image carrier to the transfer body at a single transfer position, and image exposure at a single exposure position corresponding to the transfer position. Exposure means for performing, a frame body that holds the plurality of image forming units, and that can be rotationally moved so as to be sequentially positioned at an image forming position corresponding to the exposure position and the transfer position,
Having a moving means for rotating the frame, and a single insertion port for inserting and removing the image forming unit from the apparatus one by one in the radial direction of rotation, according to the rotational position of the frame. In accordance with the rotational position of the frame, the display content changes corresponding to the type of image forming unit to be taken in and out at each rotational position, and an identification display for identifying the type and orientation of the image forming unit to be mounted. Means,
A color image recording apparatus that forms a color image by transferring toner images of different colors onto a transfer member in a superposed manner while adjusting the positions may be used. Further, the present invention includes the electrostatic image carriers each rotating at least and developing means having toners of different colors, so that toner images of different colors can be formed on the electrostatic image carriers. A plurality of image forming units, transfer means for transferring the toner image on the electrostatic image carrier to the transfer body at a single transfer position, and image exposure at a single exposure position corresponding to the transfer position Exposure means for performing
A frame body that holds the plurality of image forming units, and that can rotate and move so as to sequentially correspond to the image forming position corresponding to the exposure position and the transfer position, and a moving unit that rotates the frame body Having a single insertion opening for inserting and removing the image forming unit from the device one by one in the radial direction of rotation according to the rotational position of the frame, and according to the rotational position of the frame. An erroneous mounting prevention means for preventing erroneous mounting of the type and orientation of the image forming unit in a different shape corresponding to the type of the image forming unit to be taken in and out at each rotational position, facing the insertion opening. ,
A color image recording apparatus may be used in which toner images of different colors are transferred onto a transfer body in a superposed manner while being aligned to form a color image. Further, the color image recording apparatus of the present invention is provided with an electrostatic image carrier each rotating at least and a developing unit having a toner of a different color, and a different color of each color is formed on the electrostatic image carrier. A plurality of image forming units capable of forming a toner image, a transfer unit for transferring the toner image on the electrostatic image carrier to the transfer body at a single transfer position, and a single unit corresponding to the transfer position Exposure means for performing image exposure at an exposure position, and a frame that holds the plurality of image forming units and is rotatable so as to be sequentially positioned at an image forming position corresponding to the exposure position and the transfer position. Moving means for rotating and moving the frame, and a single insertion window for taking the image forming units out of the apparatus one by one according to the rotational position of the frame, and Unit type With a detector that is detectable and the manner of detection changes according to each rotational position of the frame body, having erroneous insertion detection means for detecting whether or not the type to be taken in and out at each rotational position, A color image recording apparatus may be used in which toner images of different colors are transferred onto a transfer body in a superposed manner while being aligned to form a color image. Further, the color image recording apparatus of the present invention is provided with an electrostatic image carrier each rotating at least and a developing unit having a toner of a different color, and a different color of each color is formed on the electrostatic image carrier. A plurality of image forming units capable of forming a toner image, a transfer unit for transferring the toner image on the electrostatic image carrier to the transfer body at a single transfer position, and a single unit corresponding to the transfer position Exposure means for performing image exposure at an exposure position, and a frame that holds the plurality of image forming units and is rotatable so as to be sequentially positioned at an image forming position corresponding to the exposure position and the transfer position. Position detecting means having moving means for rotating and moving the frame, and detecting a rotational position of the frame, unit detecting means capable of detecting the type of the image forming unit, and the position detecting means And Uni Control means for comparing the outputs of the two detection means to notify the presence / absence of a unit, the erroneous mounting, and / or the prevention of the start of the operation of the apparatus. May be a color image recording apparatus that transfers the images in a superposed manner to form a color image.

With the above configuration, when replacing the image forming unit for maintenance, the unit of the wrong color is not mounted at the wrong position in the apparatus, and the apparatus can be easily maintained by the user. Become like

According to this configuration, even though various units are inserted and removed from the same unit insertion window, the type of the unit to be automatically inserted can be determined according to the state of the apparatus at that time. The user's work for maintenance is further greatly simplified.

(First Embodiment) A color electrophotographic apparatus according to a first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall configuration diagram of a color electrophotographic apparatus according to an embodiment of the present invention. First, almost black, cyan,
The four fan-shaped image forming units 1Bk, 1C, 1M, and 1Y for each color of magenta and yellow form an image forming unit group, and are arranged in a ring as shown in the figure. Each image forming unit is made of the same constituent members except for the developer contained therein, so that the image forming unit for black will be described for simplification of description, and the other colors will be omitted. In addition, for each color, the same parts are given the same reference numerals, and when it is necessary to distinguish the configuration of each color,
Letters indicating each color are added to the code. FIG. 2 shows the black image forming unit 1Bk in detail.

In FIG. 2, reference numeral 9 denotes an organic photoreceptor in which phthalocyanine is dispersed in a polycarbonate binder resin;
0 is a non-rotating magnet fixed coaxially with the photosensitive member 9;
Denotes a charging roller for negatively charging the photoconductor, 13 denotes a signal light by a laser beam, and 14 denotes a developer hopper.

In the developer hopper 14, a two-component developer 26 is prepared by mixing a ferrite carrier 24Bk having a particle diameter of 50 μm, the surface of which is coated with a silicone resin, and a toner 25Bk.
Bk was added, and was adhered to the surface of the photoconductor 9 by magnetic force. The toner used is obtained by dispersing a pigment in a polyester resin and further adding an additive.

Reference numeral 17 denotes a rotatable collecting electrode roller made of aluminum, 16 denotes a non-rotating magnet coaxially fixed inside, 18 denotes an AC high-voltage power supply for applying a voltage to the collecting electrode roller, and 19 denotes a power supply on the collecting electrode roller. A scraper made of polyester film that scrapes toner. Photoconductor 9
Has a diameter of 30 mm and is rotated in the direction of the arrow at a peripheral speed of 60 mm / s. The collecting electrode roller 17 has a diameter of 16 mm and a peripheral speed of 60 mm.
Rotated in the direction of the arrow with / s.

Reference numeral 27 denotes a cleaner for cleaning the toner remaining on the surface of the photosensitive member after the transfer. The operation of the image forming unit configured as described above will be described below with reference to FIG. The photoconductor 9 was charged to −500 V by the charging roller 11. A signal light 1 by a laser beam is applied to the photosensitive member 9.
Irradiation No. 3 to form an electrostatic latent image. At this time, the exposure potential of the photoconductor was -100V.

On the surface of the photosensitive member 9, a two-component developer 26
Bk was deposited by magnetic force in the developer hopper 14.
Next, the surface of the photoconductor 9 was passed in front of the collection electrode roller 17. When the photosensitive member 9 passes through the uncharged area, the recovery electrode roller 17 is superposed by a high-voltage AC power supply 18 on which a DC voltage of 0 V is superimposed, 750 V0-p (1.5 k peak-to-peak).
V) (frequency 1 kHz). After that, when passing through the surface of the photoconductor 9 on which the electrostatic latent image is written by being charged to −500 V, a DC voltage of −350 V is superimposed on the collecting electrode roller 17 by the AC high voltage power supply 75.
An AC voltage (frequency 1.5 kHz) of 0V0-p (1.5 kV peak-to-peak) was applied. Then, the toner adhered to the carrier and the charged portion on the photoconductor 9 was collected by the collection electrode roller 17, and a negative-positive toner image was left only on the image portion on the photoconductor 9. The carrier and toner adhering to the collecting electrode roller 17 rotating in the direction of the arrow are scraped off by the scraper 19 and are again returned to the developer hopper 1.
4 and used for the next image formation.

Thus, a black toner image is obtained on the photoreceptor 9. The image forming unit shown in FIG. 2 is an image forming unit for black, and also shows the vertical position of the image forming unit at the image forming position. In the figure, two-component developer 2
The developer hopper 14 containing 6Bk is located on the upper side, and the cleaner 27 is located on the lower side.
The development and cleaning can be performed smoothly without providing a feeding mechanism or a stirring mechanism for moving the developer or toner inside the cleaner or inside the cleaner 27. That is, in the developer hopper 14, the developer is supplied onto the photoreceptor 9 by its own weight, and in the cleaner 27, the toner scraped by the blade falls to the bottom of the cleaner by its own weight and separates from the photoreceptor.

Image forming units 1C and 1 other than black
M and 1Y have the same configuration and operate.

The configuration of the printer unit will be described again with reference to FIGS. The image forming units 1Bk, 1C, 1M, and 1Y arranged in an annular shape are supported by a frame 51 (omitted in FIG. 1) having an annular shape of four storage units as shown in FIG. .

Returning to FIG. 1, the image forming unit group supported by the frame 51 is driven as a whole by a moving motor 30 controlled by a control circuit 29, which is a moving means, to form a cylindrical fixed member. It is rotatable in the direction of the arrow around the shaft 31 that is not rotated. Each image forming unit 1
Bk, 1C, 1M, and 1Y are sequentially moved to and positioned at an image forming position 50 facing a transfer roller 33 that supports an intermediate transfer belt 32 described later. The image forming position 50 is also an exposure position by the signal light 13.

Reference numeral 3 denotes a laser exposure device, which is a signal light 13 of a laser beam modulated by a signal input to a printer unit.
Which is generated by the image forming units 1Bk and 1Bk in FIG.
The light passes through the optical path formed between the fan sectors of Y, enters the mirror 5 fixed inside the shaft 31 through the transparent window 4 opened in a part of the shaft 31, and is reflected to the image forming position 50. The photosensitive member 9 of a certain image forming unit is irradiated to form a latent image.
In the state of FIG. 1, it acts on the image forming unit 1Bk for black.

Here, since the optical path to the mirror 5 is along the wall surface of the fan-shaped image forming units on both sides, there is almost no wasteful area occupied by the image forming unit group. Further, since the mirror 5 is provided at the center of the image forming unit group, it can be constituted by only one fixed mirror, and has a simple and highly reliable structure for alignment and the like.

Reference numeral 32 denotes an intermediate transfer belt having a thickness of 100 μm.
Is wound around a transfer roller 33 and a stainless steel drive roller 34, which are made of an endless belt-like semiconducting polycarbonate-based film, and are formed of urethane foam with a low resistance treatment. It is possible. Here, in this embodiment, the distance between the drive roller 34 and the second transfer roller 35 is set so that the circumference thereof is slightly longer than the length of the A4 sheet in the longitudinal direction.
The transfer roller 33 is lightly pressed against the photoconductor 9 of the unit 1Bk at the image forming position 50 via the intermediate transfer belt 32. A second transfer roller 35 having the same configuration as the above-described transfer roller 33 is lightly pressed to the driving roller 34 via the intermediate transfer belt 32 so as to be driven and rotatable.

Intermediate transfer belt 32 and second transfer roller 35
The paper feed sections 36a and 36b
The paper transport path is formed so that paper is sent from the printer.

Reference numeral 40 denotes a belt cleaner section including a belt cleaner for cleaning the intermediate transfer belt 32.

Reference numeral 44 denotes a fixing device for fixing the toner image on the transferred paper, and reference numeral 45 denotes a discharge roller for discharging the fixed paper. The above is the description of the main configuration of the electrophotographic apparatus of the present invention.

Next, the operation of this apparatus when forming a color image will be described. First, each image forming unit is at a position as shown in FIG. 1, and the image forming unit 1Bk for black is positioned at the image forming position 50. It also faces the transfer roller 33. The black signal light is input to the image forming unit 1Bk by the laser exposure device 3, and an image is formed with black toner. At this time, the image forming unit 1Bk
The image forming speed (equal to the peripheral speed of the photoreceptor) and the moving speed of the intermediate transfer belt 32 are set to be the same. The image is transferred to the intermediate transfer belt 32. Immediately after all the black toner images have been transferred, the entire image forming unit group 1Bk, 1C, 1M, 1Y is driven by the moving motor 30 to rotate integrally in the direction of the arrow in FIG. The image forming unit 1 </ b> C rotates and stops at a position where the image forming unit 1 </ b> C reaches the image forming position 50.
C is positioned. During this movement, the portion of the developer hopper 14 (see FIG. 2) other than the photoconductor of the image forming unit is located inside the rotation arc at the tip of the photoconductor.
The intermediate transfer belt 32 does not contact the image forming unit.

After the image forming unit 1C arrives at the image forming position 50, the laser exposure device 3 inputs a signal light to the image forming unit 1C with a cyan signal as before, and forms and transfers a cyan toner image. Done. At this time, the timing of writing the cyan signal light is controlled such that the intermediate transfer belt 32 makes one rotation and the next cyan toner image is positionally matched with the previously transferred black toner image. During this time, the second transfer roller 35 and the belt cleaner section 40 are slightly separated from the intermediate transfer belt 32, and do not act on the toner image thereon.

The same operation as described above is performed for magenta and yellow, and four color toner images are superimposed on the intermediate transfer belt 32 in a position-matching manner to form a color image. After the transfer of the final yellow toner image, the toner images of the four colors are collectively transferred to the sheet sent from the sheet feeding unit 36a or 36b at the same time by the operation of the second transfer roller 35. The toner image transferred to the paper is fixed by the fixing device 44. Thereafter, the sheet is discharged out of the apparatus via a discharge roller 45. The transfer residual toner remaining on the intermediate transfer belt 32 is cleaned by the operation of the belt cleaner unit 40 to prepare for the next image formation.

Next, the operation in the monochrome mode will be described. In the monochrome mode, first, an image forming unit of a predetermined color is moved to the image forming position 50 and positioned. Next, image formation of a predetermined color and transfer to the intermediate transfer belt 32 are performed in the same manner as before, and the transfer is continued as it is after the transfer, and is sent from the paper feed unit 36a or 36b by the next second transfer roller 35. Transfers to incoming paper.

The above is the description of the overall configuration of the apparatus to which the present invention is applied. However, since the image formation of each color is performed at the same image forming position 50 by the above-described configuration, accurate colors can be obtained with a simple configuration. And the image forming units are completed independently as a single image forming unit for each color, so the structure is simple and maintenance is easy, such as easy replacement for each color. It will be excellent.

Further, in this configuration, since each image forming unit including the photosensitive member 9 can be independently adjusted externally, for example, a unit already adjusted at the time of shipment from a factory can be easily replaced without adjustment on site. is there.

Furthermore, in this configuration, even when a color image is continuously formed, each photosensitive member 9 is inactive every time while forming another color, so that a stable image without electrostatic fatigue is obtained. Is obtained.

Next, maintenance of the apparatus will be described. It is assumed that the developer of a specific color is no longer consumed and maintenance is performed. First, the image forming unit group is rotated by the action of the moving motor 30 controlled by the control circuit 29 in response to a command from an operator (by a switch (not shown)), and the image forming unit of the target color is moved to the upper position (FIG. 1). (The position of the image forming unit 1C). Then, as shown in FIG. 3, the operator opens the cover 46 located at the upper part of the apparatus main body, and takes out only the image forming unit of interest from the insertion port 47 to the outside of the apparatus. Next, a new image forming unit of the color adjusted in advance as an image forming unit is mounted.

Therefore, after mounting, image formation can be started without any adjustment. Further, since the image forming unit to be replaced can be replaced at an upper position different from the image forming position 50, without being disturbed by related members such as the transfer unit,
In addition, since it is not positioned, it can be easily taken out of the apparatus, and the maintenance is excellent.

Here, if the image forming unit to be newly mounted at the time of replacement is not mounted in an appropriate one of the four storing portions of the frame 51 according to the color of the development, a correct color image is formed. Can not do. Since the image forming units of the respective colors are almost the same in shape, erroneous mounting in which the image forming units are put in the wrong storage unit easily occurs. A configuration for preventing this erroneous mounting in the present embodiment will be described below with reference to FIG.

FIG. 4 shows the insertion slot 47 and its periphery in a state in which the cover 46 is opened, with the exterior of the apparatus partially sectioned. In this case, of the four storage portions of the frame 51, A cyan storage section 51 </ b> C into which the cyan image forming unit is to be placed faces the insertion slot 47. Black storage section 51B of frame 51
Similarly to the black identification labels 53B and 54B indicated by, an identification label in the form of an arrow colored in cyan is also provided inside the cyan storage portion 51C (not shown in the figure).
Before attaching the image forming unit, cover 4 is attached.
When the unit 6 is opened, the user can clearly see which color unit should be inserted through the insertion opening. Therefore, the user can easily replace the image forming unit without erroneous mounting.

Further, an identification display plate 52C whose surface is colored cyan is integrally provided at a side end of the frame body 51 corresponding to the cyan storage section 51C. On the other hand, a display window 55 is formed on the exterior of the end portion of the insertion slot 47 at a position facing the identification display plate 52C, and the identification display plate 52C is externally provided.
Is visible. Therefore, the frame 51 shown in FIG.
It is clear to the user that the user should insert the cyan image forming unit at the position shown in FIG.

Furthermore, a label 56 in the shape of an arrow colored in cyan is provided above the cyan image forming unit.
Since C is affixed, it can be seen that the orientation of the unit should be matched with the direction of the arrow on the identification label. Also, when the unit is inserted, it is possible to confirm whether the type and the orientation are correct by the correspondence between the label 56C and the identification display plate 52C.

The same applies to the case where the frame 51 rotates to mount an image forming unit of another color. For example, when the black storage section 51B faces the insertion slot 47, the black identification display labels 53B and 54B and the black identification display plate 5
2B becomes visible from the outside.

The above is the configuration for preventing erroneous mounting in the present embodiment. In this case, the identification label and the identification display
Although the double erroneous mounting prevention is performed by the two means, the object and the effect of the present invention can be achieved by using only one of them.

Further, in this embodiment, the identification display label or the identification display plate is colored in a development color, but a symbol or a character may be used instead of the color identification.

As described above, in this embodiment, although various image forming units are mounted from one insertion port,
Since the type and orientation of the image forming unit to be automatically inserted can be automatically determined according to the state of the apparatus at that time, an apparatus that is easy to operate and has good maintainability without erroneous mounting can be configured.

The above is the description of the configuration and operation of the first embodiment. Second Embodiment Next, the configuration and operation of the second embodiment will be described. The configuration of the main part of the second embodiment is the same as that of the first embodiment (FIGS. 1 to 3), so that the description thereof will be omitted, and the configuration and operation for preventing erroneous mounting will be described with reference to FIGS. .
Only the image forming unit uses the same reference numeral 1C as in the first embodiment.

In the case of this embodiment, projections for preventing erroneous mounting are provided at both ends of the image forming unit. For example, as shown in FIG.
6C and 67C are provided. 6 of these projections
7C is provided at a different position of the image forming unit depending on the type of the image forming unit, that is, the developing color, as described later. The projection 66C and the projection 67C have different vertical lengths.

On the other hand, on both side ends of the cyan storage section 61C of the frame body 61, at a position where the cyan image forming unit 1C is completely mounted and the projections 66C and 67C are engaged, and a corresponding length is provided. Are provided with grooves 63C and 64C.
The position of the groove 64C among these two grooves differs depending on the storage portion of each color of the frame, and as shown by the dashed line in FIG. 5, each storage portion for storing the black, magenta, and yellow units has:
They are formed at 64'B, 64'M, and 64'Y, respectively. On the other hand, the position of the groove 63C is common in each storage section.

Corresponding to the positions of these grooves, the projections on the far side of the projections of the image forming unit (corresponding to the projections 67C of the cyan image forming unit) are provided so as to be shifted in position for each color unit. Each storage section can store only an image forming unit for a predetermined color. Even if the user attempts to insert the image with the wrong color, the projection stops and the image forming unit partially stops beyond the insertion opening 68 and stops. Therefore, when the cover 69 is to be closed as it is, the cover 69 stops in a half-open state.

Further, even if an attempt is made to insert the image forming unit with the back side and the front side reversed, the image forming unit of any color cannot be completely inserted because the length of the groove is different between the back side and the front side.

On the other hand, a switch pressing plate 70 is provided at an end of the cover 69. As shown in FIG.
When the switch 9 is completely closed to the normal position, the switch 71 is operated to be operable. However, when the unit of the wrong color is mounted as described above, the switch does not operate because the cover is not completely closed. Operation cannot be started.

As described above, in the present embodiment, even if an attempt is made to mount the unit with the wrong type or orientation, the unit cannot pass through the insertion slot completely. It is possible to set the state, or to notify the user of erroneous attachment or the like by using an appropriate display means.

The above is the description of the configuration and operation of the second embodiment. Third Embodiment Next, the configuration and operation of the third embodiment will be described. The configuration of the main part of the third embodiment is also the same as that of the first embodiment (from FIG. 1 to FIG. 3), so the description is omitted, and the configuration and operation for preventing erroneous mounting will be described with reference to FIGS. explain. FIG. 7 is a diagram illustrating a portion of the frame when the cyan storage unit is opposed to the insertion slot 47 (FIG. 3).

In this embodiment, as shown in FIG.
A detection hole for light transmission is provided at a position corresponding to each storage section of the side plate on the front side of the front panel. For example, a detection hole 8 is provided in a portion corresponding to the storage portion 81C of the cyan image forming unit 1C.
2C is provided. The positions of the detection holes are slightly changed by the storage portions of the respective colors. As shown by the broken lines in FIG. 7, the positions of the detection holes corresponding to the black, magenta, and yellow storage portions are 82, respectively. 'B, 82'M,
The position is 82'Y. The entire front surface of the side plate is made of black, which is hard to reflect light.

On the other hand, on the front side of the image forming unit 1C for cyan, the detection hole 82C
A label 84 partially having a surface 83C for reflecting light is attached only at a position opposed to. The position of the light reflecting surface is different for each color unit, and the black, magenta and yellow units have 83 'in FIG.
Labels having reflective surfaces are attached at positions indicated by B, 83'M, and 83'Y.

Further, at a position facing the label, on the outside of the side plate of the frame body 81, a light reflection detector in which a light emitting portion and a light receiving portion are arranged as a pair of detecting portions and four pairs are arranged side by side to form a set. 85 is provided fixed to the device. Therefore, as shown in FIG. 8, only the detection section facing the detection hole 82C receives the reflected light and turns on.

With these configurations, the storage section for each color has
Only when the image forming unit of the color to be mounted in the storage unit is mounted, one of the pair of detection units of the light reflection detector 85 is turned on, and otherwise, there is no response. According to this configuration, which of the four pairs of detectors arranged horizontally detects which pair of detectors is automatically determined by the positions of the detection holes in the respective color storage portions of the frame body 81. With only the set of light reflection detectors 85, it is possible to determine whether or not the type of the image forming unit is mounted in the correct storage unit and how many colors the unit is for. Also, if the image forming unit is inserted in the wrong direction, it will not be detected even if the color is correct.

As described above, in the present embodiment, a large amount of information can be obtained and the erroneous mounting of the unit can be detected by a simple configuration of the detecting means.

When the present configuration is combined with another simple unit presence / absence detecting means (not shown), (1) which color storage section is currently facing the insertion slot 47 as the state of the apparatus; All information such as whether or not the unit is mounted in the storage unit, and (3) whether or not the type and orientation are correct if mounted, can be detected with a simple configuration.
If necessary, the apparatus can be set in an inoperable state, or an appropriate display means can be used to notify the user of erroneous mounting. Further, in the present embodiment, the position of the detection hole 82C is made different in each storage part in order to change the detection method according to the rotation position of the frame 81, but the detector itself is changed according to the frame rotation position. Other methods, such as varying, still achieve the purpose of the invention.

The above is the description of the configuration and operation of the third embodiment. (Fourth Embodiment) Next, the configuration and operation of the fourth embodiment will be described. The configuration of the main part of the fourth embodiment is also the same as that of the first embodiment (FIGS. 1 to 3), so that the description is omitted, and the configuration and operation for preventing erroneous mounting will be described with reference to FIGS. explain.

FIG. 9 is a view showing a frame portion in the case where the cyan storage section faces the insertion slot 47 (FIG. 3).
In this embodiment, parts having the same functions as those in the third embodiment are denoted by the same reference numerals.

The same label 84 as in the third embodiment is attached to the cyan image forming unit 1C. The position of the reflection surface 83C is different for each color, as in the third embodiment.

On the side plate of the frame 91, grooves 92B, 92C, 92M and 92Y are formed at positions facing the label 84 of the unit in a state where the image forming unit is mounted in each storage section. At the same position as in the third embodiment, a unit detector 93 having the same configuration is fixedly installed on the apparatus. Thereby, it is possible to detect how many color units are mounted in the storage portion of the frame body facing the insertion opening.

On the other hand, a shaft detector of the frame 91 is provided with a position detector 94 for detecting the rotational position of the frame. This makes it possible to detect the rotational position of the frame, that is, how many colors of the storage portion of the frame are now facing the insertion opening.

As shown in FIG. 10, the outputs of the unit detector and the position detector are compared with each other through a control circuit,
It is configured to output to the alarm and the drive circuit. For example, when an erroneous mounting is detected, a notifying device for notifying the erroneous insertion or the like is operated by a display means (not shown), and the information is input to a drive circuit to make the device inoperable.

According to the above arrangement, the type of unit to be automatically inserted is determined based on the state of the apparatus at the time, although various units are inserted and removed from the same one unit insertion window. Since the user can be instructed and control the apparatus in response, the user's work for maintenance is greatly simplified.

The above is the description of the fourth embodiment. In the above-described embodiments, a specific developing method is used for the image forming unit. However, even in the case of an image forming unit having a structure using another developing method, the essence and operational effects of the present invention may be changed. Absent. As described above, in the present invention, since the image formation of each color is all performed at the same image formation position, accurate color registration can be performed with a simple configuration. In addition, since the image forming units are completed independently as one image forming unit for each color, the configuration is simple, and maintenance such as easy replacement of the image forming unit adjusted in advance for each color is possible. The properties are also excellent.
Further, when the image forming unit is replaced for maintenance, the unit of the wrong color is not mounted in the wrong position in the apparatus, and the apparatus can be easily maintained by the user. According to this configuration, even though various units are mounted from the same one unit insertion window, the type of the unit to be automatically inserted can be determined based on the state of the apparatus at that time, so that maintenance can be performed. The work of the user becomes much easier.

[0067]

As described above, according to the present invention, when an individual unit is replaced for toner consumption or maintenance, the individual unit of the wrong color is not mounted at the wrong position in the apparatus. The user can easily maintain the apparatus. In particular, replacing the developing unit
Since the replacement is performed only when the opening is disposed above, the replacement operation can be performed while confirming the color of the stored color toner. Accordingly, it is possible to obtain a color image recording apparatus having a small, simple, and easy-to-maintain developing unit.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a color electrophotographic apparatus according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of an image forming unit used in the color electrophotographic apparatus according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram when an image forming unit is replaced.

FIG. 4 is a configuration diagram around a frame of the first embodiment.

FIG. 5 is a configuration diagram around a frame according to a second embodiment.

FIG. 6 is a partial configuration diagram of an insertion slot of the second embodiment.

FIG. 7 is a configuration diagram around a frame body according to a third embodiment.

FIG. 8 is an explanatory diagram showing a state of detection of erroneous mounting in the third embodiment.

FIG. 9 is a configuration diagram around a frame body according to a fourth embodiment.

FIG. 10 is a block diagram showing the flow of a detection signal according to a fourth embodiment;

[Explanation of symbols]

 1Bk, 1C, 1M, 1Y Image forming unit 3 Laser exposure device 5 Mirror 9 Photoreceptor 13 Signal light 32 Intermediate transfer belt 33 Transfer roller 35 Second transfer roller 47 Insertion port 50 Image forming position 51, 61, 81, 91 Frame

Claims (2)

[Claims] A plurality of individual units each having a toner storage unit are collectively arranged in a substantially cylindrical shape, are configured to be detachable from an opening / closing unit on an upper surface of the apparatus, and rotate while an identification display unit is always located on an outer peripheral side. A color image recording apparatus having a rotatable member configured to be capable of transferring an image formed on a photoreceptor at an image forming position to recording paper via an intermediate transfer member, wherein the plurality of individual units are provided. Each of the identification display unit indicating the color of the toner stored in the toner storage unit or the mounting direction to the rotating body, is disposed at a position visible from above when the opening and closing unit on the upper surface of the apparatus is open, A color image recording apparatus characterized in that it can be taken out from the lid on the top surface of the apparatus to the rotating body only when the identification display section is directed upward. 2. A plurality of individual units each having a toner storage section are collectively arranged in a substantially columnar shape, are configured to be detachable from an opening / closing section on an upper surface of the apparatus, and rotate while the identification display section is always located on the outer peripheral side. An individual unit used only in a color image recording apparatus having a rotatable member configured to be capable of transferring an image formed on a photoreceptor at an image forming position to recording paper via an intermediate transfer member. An identification display unit that indicates the color of the toner stored in the toner storage unit or the mounting direction of the toner to the rotating body, is disposed at a location visible from above when the opening / closing unit is open on the upper surface of the apparatus, Wherein the identification unit can be taken out of the rotating body via the lid on the upper surface of the apparatus only when the identification display unit is directed upward.