JP3323288B2 - Color image recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color image recording apparatus applicable to a color printer, 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 this color image, a toner image of each color is sequentially formed on one photoconductor, and the transfer material wound around the transfer drum is rotated to repeatedly oppose the photoconductor, and the color of each color sequentially formed there is formed. A transfer drum system in which toner images are superimposed and transferred, and a plurality of image forming units are arranged side by side, and each color toner image is sequentially transferred to a transfer material conveyed by a belt or the like by passing through the position of each image forming unit. In general, a continuous overlapping method in which the sheets are overlapped is performed.

The former using the transfer drum system is an example of a color image forming apparatus disclosed in Japanese Patent Application Laid-Open No. 1-252982.

FIG. 4 shows an outline of the entire configuration of the conventional example, and the configuration and operation will be briefly described below. In FIG. 4, reference numeral 101 denotes a photosensitive member, and
02, a developing unit 103, a transfer drum 104, and a cleaner 105 are provided. The developing unit 103 includes a Y developing unit 106 for forming a yellow toner image, an M developing unit 107 for magenta, and a C developing unit 10 for cyan.
8, a K developing device 109 for black, and the whole is rotated so that each developing device can be developed in a state where the developing device can face the photoconductor 101 sequentially.

During operation, the transfer drum 104 and the photoreceptor rotate at a constant speed in the direction of the arrow while facing each other.

First, when the operation is started, the photosensitive member 101 rotates in the direction of the arrow, and the surface thereof is uniformly charged by the charger 102.

Thereafter, the surface of the photoreceptor is irradiated with a laser beam 110 modulated by a signal for forming a first color yellow image.
To form a latent image. Further, this latent image is first developed in the yellow developing unit 106 facing the photoreceptor to form a yellow toner image. By the time the formed yellow toner image comes to a position facing the transfer drum 104, one sheet of the transfer material sent from the sheet feeding unit 111 has already been formed on the outer periphery of the transfer drum 104 with the claw part. The toner image is formed such that the yellow toner image on the photoreceptor is opposed to a predetermined position of the paper and is wrapped around the paper.

After the yellow toner image on the photoreceptor is transferred to the sheet by the operation of the transfer charger 113, the surface of the photoreceptor is cleaned by the cleaner 105 to prepare for the formation of the next color image. Subsequently, magenta, cyan, and black toner images are formed in the same manner. At that time, the developing unit 103 sets each developing unit that uses the color corresponding to the photoconductor to be in a developable state. The diameter of the transfer drum is large enough to allow the longest sheet to be wound and to replace the developing device between the images of each color.

Laser beam 110 for forming images of each color
Is performed at a timing such that the toner images of the respective colors on the photoreceptor and the toner images already transferred onto the paper on the transfer drum are aligned and faced with each other as they rotate. In this manner, the four color toner images are transferred to the transfer drum 10.
4, the image is transferred onto the sheet, and a color image is formed on the sheet. After the toner images of all colors have been transferred, the sheet is peeled off from the transfer drum 104 by the peeling claws 114, the upper toner image is fixed by the fixing device 116 via the transport section 115, and the sheet is discharged out of the apparatus. The above is a brief description of the configuration and operation of the conventional example.

On the other hand, as an example of a color image forming apparatus using the continuous transfer system, there is Japanese Patent Application Laid-Open No. 1-250970. In this example, four image forming stations each including a photoreceptor and an optical scanning unit are arranged for forming images of four colors, and the paper conveyed to the belt passes under the respective photoreceptors and passes therethrough. The toner images are superimposed.

Further, as another method of forming a color image by superimposing toner images of different colors on a transfer material, a method of superimposing toner images of respective colors sequentially formed on a photoreceptor on an intermediate transfer material is used. Is transferred to the transfer material at once as disclosed in JP-A-2-183276.

[0012]

Among the conventional examples described above, in the transfer drum system, a transfer drum is used to align and overlap toner images of different colors. The transfer drum is rotated at the same speed with respect to the photosensitive member, and the timing of the leading edge of the image is adjusted to match the mutual positions of the toner images of the respective colors when a color image is formed. However, in the above configuration, since the paper must be wound around the transfer drum, the diameter of the transfer drum needs to be a certain size or more, and the structure is very complicated. Had become.

Further, rigid paper such as postcards and cardboard cannot be used because they cannot be wound around the transfer drum.

On the other hand, the continuous transfer method has an image forming position corresponding to the number of colors, and a sheet is required to pass through the sheets one after another. Therefore, a transfer drum is not necessary. A latent image forming means such as a laser optical system for forming a latent image is required corresponding to the number of colors, and the structure is very complicated and expensive at this portion. Furthermore, since there are a plurality of image forming positions, the relative positional relationship between the image forming units of each color greatly affects the color shift. In particular, it is necessary to accurately position each color of the latent image by the latent image forming means, and as shown in the example of JP-A-1-250970, the image exposure system of the latent image forming means is required. There was a problem that a considerable device and a complicated configuration were required.

Further, Japanese Patent Application Laid-Open No. 2-1 uses an intermediate transfer material.
In the example disclosed in JP-A-83276, the shape of the photoconductor becomes large so that a toner image of each color can be formed on one photoconductor by each color developing unit. For example, a belt-shaped photoconductor is required. It becomes. In addition, there is a problem that the maintenance of the developing units and the photosensitive members of each color is also difficult. For example, each developing device requires image adjustment and position adjustment with the photoconductor at the time of maintenance, and the same applies when the photoconductor is replaced.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a small and simple configuration that does not require a complicated transfer drum and does not require a complicated configuration for alignment of an image exposure system. An object of the present invention is to provide an excellent color image recording apparatus which can be accurately performed, has a simple configuration of a toner image forming section including a photoconductor and a developing device, is small in size, and has good maintainability.

[0017]

According to the present invention, there is provided a color image recording apparatus in which a plurality of individual units integrally having a toner container and a photoreceptor are collectively arranged in a detachable state in a substantially annular shape. A color image recording apparatus having a body, and transferring the image exposed and developed on the photoreceptor to an intermediate transfer body , wherein the image forming position is such that the individual units are located laterally, The toner container of the individual unit is disposed above the photoconductor. According to this configuration, at the time of image formation, since the toner storage portion of the individual unit at the image forming position is located above the photoconductor of the individual unit, the toner photoconductor in the toner storage portion can be provided without providing the feeding mechanism. Supply in the direction can be performed.
Therefore, the configuration of the individual unit is simple and small, and the size of the device can be reduced. In addition, since the individual units are rotated, the toner in the toner container is agitated, so that no agitation mechanism is required.

Further, in the color image recording apparatus of the present invention, a plurality of individual units integrally having a toner container, a photoreceptor, and a photoreceptor cleaning means are collectively arranged in a detachable state in a substantially annular shape. A color image recording apparatus that has a rotating body and transfers an image exposed and developed on the photoconductor to an intermediate transfer body , and in an image forming position, the individual unit is located on a side, The toner accommodating portion of the individual unit is disposed above a photoconductor, while the photoconductor cleaning unit is disposed below the photoconductor.

According to this configuration, when forming an image, the toner storage section of the individual unit at the image forming position is located above the photosensitive member of the individual unit, and the photosensitive member cleaning means is located below the photosensitive member. The toner in the toner container can be supplied in the direction of the photoconductor without providing a mechanism, and the toner remaining on the photoconductor can be collected without providing a collection mechanism. Therefore, the configuration of the individual unit is simple and small, and the size of the device can be reduced.

Further, in the color image recording apparatus of the present invention, a plurality of individual units integrally having a toner storage section, a photoconductor and a photoconductor cleaning means are collectively arranged in a detachable state in a substantially annular shape. A color image recording apparatus having a rotating body, and transferring an image exposed and developed on the photosensitive body to an intermediate transfer body , wherein the rotating body is configured such that the photosensitive body is always positioned outside the individual unit. While supporting in a state where the photosensitive member is positioned at an individual unit replacement position where the photosensitive member is positioned upward and an image forming position where the photosensitive member is positioned laterally,
In the image forming position, the individual unit is supported such that the toner storage unit is disposed above the photoconductor and the photoconductor cleaning unit is disposed below the photoconductor. According to this configuration, the rotating body is stopped at the individual unit exchange position above the apparatus at the time of individual unit exchange or maintenance, so that individual unit exchange or maintenance can be easily performed. In addition, during image formation, the rotating body stops at a position where the toner storage unit is located above and the photoconductor cleaning unit is located below, so that the toner in the toner storage unit can be moved in the direction of the photoconductor without providing a feeding mechanism. The toner can be supplied, and the toner remaining on the photoreceptor can be collected without providing a collecting mechanism. Therefore, the configuration of the individual unit is simple and small, and the size of the device can be reduced.

Further, in the color image recording apparatus of the present invention, in the color image recording apparatus described above, the rotating body has a cylindrical shape having an optical path changing means for changing the optical path of the exposure laser beam to expose the photosensitive body. It is configured to be rotatable around a space. According to this configuration, since the optical path changing means is provided in the cylindrical space, the occupied volume is reduced, and the device can be downsized.

The individual unit of the present invention is used in the above color image recording apparatus, and is configured to be detachable from the rotating body only above the apparatus and perpendicularly to the rotation axis of the rotating body.
It is characterized by the following. According to this configuration, since it is detachable in a direction perpendicular to the rotation axis of the rotating body, it can be easily removed and attached above the apparatus. That is, an easy-to-use individual unit can be provided.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A color image recording apparatus according to one embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall configuration diagram of a color image recording apparatus according to an embodiment of the present invention. First, four sets of fan-shaped image forming units 1Bk, 1C, 1M, and 1Y for each color of black, cyan, magenta, and yellow form an image forming unit group in the center, and are arranged in an annular shape as shown in the figure. Have been. 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. Note that, for each color, the same portions are denoted by the same reference numerals, and when it is necessary to distinguish the configuration of each color, a character indicating each color is denoted by the reference numeral. 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 2 is prepared by mixing a ferrite carrier 24Bk having a particle diameter of 50 μm whose surface is coated with a silicone resin and a toner 25Bk.
6Bk was added and attached to the surface of the photoreceptor 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 that applies 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.
/ S rotated in the direction of the arrow.

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 electrode roller 17
750 V0-p (1.5 kV peak-to-peak) AC voltage (frequency 1 kHz) superimposed on a DC voltage of 0 V was applied from the AC high voltage power supply 18 to the AC power supply. Then, -5
When passing through the surface of the photoreceptor 9 charged with the electrostatic latent image and charged to 00 V, the electrode roller 17 is superposed by a high-voltage power supply 18 on which a DC voltage of -350 V is superimposed and 750 V0-p (peak-to-peak 1. 5 kV) AC voltage (frequency 1.5 kHz) was applied. Then, the toner adhered to the carrier and the charged portion on the photoconductor 9 was collected by the electrode roller 17, and the negative-positive toner image was left only on the image portion on the photoconductor 9. Electrode roller 17 rotating in the direction of the arrow
The carrier and the toner adhered to the surface were scraped off by the scraper 19, returned to the developer hopper 14, 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, the developer 26Bk
Is placed on the upper side of the developer hopper 14,
Since is located on the lower side, development and cleaning can be performed smoothly without providing a feed mechanism or a stirring mechanism for moving the developer or toner inside the developer hopper or the cleaner. That is, in the developer hopper, the developer is supplied onto the photoconductor 9 by its own weight, and in the cleaner, the toner scraped by the blade falls to the bottom of the cleaner by its own weight and separates from the photoconductor.

The other developing units 1C, 1M and 1Y other than black have the same configuration and operate.

Referring again to FIG. 1, the configuration of the printer unit will be described. Image forming unit 1B arranged in an annular shape
k, 1C, 1M, and 1Y are supported by a support (not shown), and are driven by a moving motor 30 controlled by a control circuit 29 as a moving unit, and are fixed in a cylindrical shape and do not rotate. It is rotatable about the axis 31 in the direction of the arrow. Each image forming unit is sequentially moved to an image forming position 50 facing a first transfer roller 33 that supports an intermediate transfer belt 32 described below, and is positioned. 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. .

An intermediate transfer belt 32 has a thickness of 100 μm.
Is wound around a first transfer roller 33 and a stainless steel roller 34, which are formed of an endless belt-like film made of semiconductive urethane as a base material, and around which a low-resistance treated urethane foam is formed, and move in the direction of the arrow. It is possible. Here, the intermediate transfer belt 32 has a circumference of A
The length is set slightly longer than the length of the four sheets in the longitudinal direction. The first transfer roller 33 is lightly pressed against the photoconductor 9 of the unit 1Bk at the image forming position via the intermediate transfer belt 32. The second transfer roller 3 having the same configuration as the first transfer roller 33 is provided on the roller 34 via the intermediate transfer belt 32.
5 is lightly pressed so as to be able to be driven and rotated.

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.

A fixing device 44 fixes the toner image on the sheet after the transfer, and a discharge roller 45 discharges the sheet after the fixing. 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. This is also the first
It 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 1
The image forming speed of Bk (equal to the peripheral speed of the photoreceptor) and the moving speed of the intermediate transfer belt are set to be the same. The image is transferred to the intermediate transfer belt. 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 does not contact the image forming unit.

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

The same operation as described above is performed for magenta and yellow, and the four color toner images are superimposed on the intermediate transfer belt in a position-matched 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 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 an image forming position and positioned. Next, image formation of a predetermined color and transfer to the intermediate transfer belt are performed in the same manner as before, and this transfer is continued as it is, and transfer to the sheet sent from the sheet feeding unit by the next second transfer roller is performed. I will do it.

Next, maintenance of the apparatus will be described. It is assumed that the developer of a specific color is not 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 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. Also, since the image forming unit to be replaced can be replaced at an upper position different from the image forming position, it can be easily taken out of the apparatus because it is not disturbed by the related members such as the transfer unit and is not positioned. Is possible and maintenance is excellent.

The above is the description of the configuration and operation of the embodiment . According to the present invention, since the image formation of each color is performed at the same image forming position without using a transfer drum having a complicated structure, accurate color registration can be performed with a simple structure, and The forming unit is completed independently as one image forming unit for each color, so that the configuration is simple, and the maintainability such as easy replacement of each color is also excellent.

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

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

In the above embodiment, 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, operation and effect of the present invention can be obtained. Does not change.

[0049]

As described above, the present invention does not use a transfer drum having a complicated structure, has a simple structure, and forms images of all colors at the same image forming position.
Accurate color registration can be performed with a simple configuration. In addition, since the image forming unit is completed independently as one image forming unit for each color, the configuration is simple,
In addition, maintenance properties such as easy replacement of an image forming unit adjusted in advance for each color are also excellent.

Specifically, at the time of image formation,
The toner storage of the individual unit is
Since it is located above the body, it is necessary to provide a delivery mechanism.
Supply the toner in the toner storage section toward the photoconductor.
It can be carried out. Therefore, the configuration of individual units
It is simple and compact, and the device can be downsized.

At the time of image formation, the individual at the image formation position
The toner container of another unit is
The photoconductor cleaning means is located on the upper side, respectively.
Therefore, without providing a feeding mechanism, the toner
The toner in the container can be supplied toward the photoconductor.
To the photoreceptor without a collection mechanism.
Can be collected. Therefore, individual
The configuration of the unit is simple and compact, and the device can be downsized.
It works.

The rotating body can be replaced by an individual unit or
Stops at the individual unit replacement position above the device during maintenance
Facilitates replacement and maintenance of individual units
It is possible to do. Also, the rotating body is used during image formation.
Means that the toner storage unit is located
Since it stops at the position located below, set the feeding mechanism.
The toner in the toner container toward the photoreceptor
Can be supplied, and no collection mechanism should be provided.
The toner remaining on the photoconductor can be recovered.
Therefore, the configuration of individual units is simple and compact.
Thus, the size of the device can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a color image recording apparatus according to an embodiment of the present invention.

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

FIG. 3 is a diagram illustrating replacement of an image forming unit.

FIG. 4 is a configuration diagram of a conventional color image recording apparatus.

[Explanation of symbols]

 1Bk, 1C, 1M, 1Y Image forming unit 3 Laser exposure device 5 Mirror 9 Photoconductor 13 Signal light 32 Intermediate transfer belt 33 First transfer roller 35 Second transfer roller 50 Image forming position

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Claims (5)

(57) [Claims] A rotating unit in which a plurality of individual units each having a toner storage unit and a photoconductor are integrally mounted in a detachable manner in a substantially annular shape, and exposed and developed on the photoconductor. A color image recording apparatus for transferring the obtained image to an intermediate transfer member , wherein a toner storage portion of the individual unit is disposed above a photoreceptor in a state where the individual unit is located on a side at an image forming position. A color image recording apparatus. 2. A photoreceptor, comprising: a rotating body in which a plurality of individual units integrally including a toner container, a photoreceptor, and a photoreceptor cleaning unit are collectively arranged in a detachable state in a substantially annular shape. Intermediate transfer of the exposed and developed image
A color image recording apparatus for transferring images onto a body , wherein the image forming position is such that the individual units are located laterally, and the toner storage portion of the individual units is disposed above a photoconductor, while the photoconductor is A color image recording apparatus, wherein a cleaning unit is disposed below the photoconductor. 3. A photoreceptor, comprising: a rotating body in which a plurality of individual units integrally including a toner storage unit, a photoreceptor, and a photoreceptor cleaning unit are collectively arranged in a detachable state in an annular shape. Intermediate transfer of the exposed and developed image
A color image recording apparatus for transferring to a body , wherein the rotating body supports the individual unit in a state where the photoconductor is always located outside, and an individual unit replacement position and a side where the photoconductor is positioned upward. And at the image forming position, the toner accommodating portion is disposed above the photoreceptor and the photoreceptor cleaning unit is disposed below the photoreceptor, respectively. A color image recording device supporting an individual unit. 4. The rotator is configured to be rotatable around a cylindrical space having an optical path changing means for changing the optical path of the exposure laser beam to expose the photoconductor. The color image recording device according to claim 1. 5. A separate unit for use in a color image recording apparatus according to claim 1, wherein said unit is located only above the apparatus and from a direction perpendicular to a rotation axis of the body. An individual unit, which is detachably configured.