JPH0518112B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a developing device for a recording device such as an electrophotographic copying machine, which performs development using a developer containing a carrier and a toner.

[Purpose of the invention]

In a recording device such as an electrophotographic copying machine, in a developing device that uses a developer containing a carrier and toner, if the carrier is worn or deteriorated, the toner conveyance performance of the carrier deteriorates, resulting in poor development. Therefore, it is necessary to replace the carrier periodically.

Conventionally, carrier replacement involves removing the top cover of the casing of the developing device, turning the top cover side of the casing downward to remove the carrier from inside the casing, and using a scraping member to remove the carrier stuck to the rotating sleeve of the magnet roller. It had been removed.

However, such work has the problem that it is complicated and inefficient. In order to solve the above problems, the present inventor has developed a developing device that has features in the structure of the magnet roller and the support structure of the magnet roller. was developed first. This will be explained based on FIGS. 1 to 7.

FIG. 1 is an overall perspective view of a conventional developing device, and FIG.
The figure is a sectional view of the magnet roller mounting part in Fig. 1, Figure 3 is an enlarged side view of the magnet roller mounting part in Fig. 2 during normal operation, and Fig. 4 is a developer discharge. 2 is an enlarged side view of the mounting portion of the magnet roller during normal operation, FIG. 5A is a sectional view showing the state of the magnet roller in FIG. 1 during normal operation, and FIG. Another example corresponding to the one shown in FIG. 6 is a sectional view showing the state of the magnet roller in FIG. 1 when the developer is discharged, and FIG. 7 shows the relationship between the conventional developing device and the drum mount. FIG.

The developing device shown in FIGS. 1 to 6 includes a magnetic roller consisting of a rotating sleeve that conveys a developer containing a carrier and toner, a magnet body having a plurality of magnets provided in the rotating sleeve, and an opening. a casing that houses a magnet roller so as to face the opening; the developer is conveyed to the opening by rotating the rotating sleeve for development; the body has a developer release portion that produces a magnetic field that acts to cause developer material to leave the surface of the rotating sleeve; and
It is characterized by being provided so that the magnetic field can be adjusted so that the developer detachment portion can be switched and positioned between the developer reservoir side and the opening side of the casing.

Note that, in the magnet body shown in FIG. 5A, the developer separation area is a weak magnetic field area where the magnets are arranged with wide spacing, and in the magnet body shown in FIG. 5B, magnets of the same polarity are placed side by side. This is the part that makes the installed magnetic flux stand up.

Since the developing devices equipped with the magnet bodies shown in FIGS. 5A and 5B both produce similar effects, the developing device equipped with the magnet bodies shown in FIG. 5A will be specifically explained as an example. .

Reference numeral 1 denotes a developing device, which includes a rotating sleeve 31 for conveying a developer including a carrier and toner, and a magnet roller 3 provided within the rotating sleeve 31 and having a plurality of magnets 33.
and a casing 2 which has an opening 25 and houses the magnet roller 3 so as to face the opening 25, and the developer is conveyed to the opening 25 by rotating the rotary sleeve 31. A plurality of magnets 33 are used for development and are developer separation parts.
are arranged so as to have one widely spaced part 34, and are switched to the position of the developer reservoir 26 and the opening 25 of the casing 2 by the magnetic angle adjustment mechanism 4, and the wide spaced part 34 between the magnets is The device is characterized in that it includes a magnet body 32 that is provided so as to be able to position the object.

When the developing device 1 is in a normal developing operation state, the magnetic angle adjusting plate 44 of the magnetic angle adjusting mechanism 4 has its projection 45 aligned with the first abutting portion 42 of the magnetic angle adjusting board 41.
It is positioned and fixed by a screw 46 so as to come into contact with it. At this time, the portion 34 of the magnet body 32 of the magnet roller 3 with a wide gap between the magnets is located in the developer reservoir 26 of the casing 2, and is in a state where normal developing operation can be performed.

When the developer is being removed from the developing device, the magnetic angle adjustment plate 44 of the magnetic angle adjustment mechanism 4 is screwed so that its protrusion 45 abuts the second abutting portion 43 of the magnetic angle adjustment board 41. It is positioned and fixed by 46. At this time, the portion 34 of the magnet body 32 of the magnet roller 3 with a wide gap between the magnets is located in the opening 25 of the casing 2. Therefore, by arranging the developing device 1 so that its opening 25 faces downward and rotating the rotating sleeve 31, the developer attached to the rotating sleeve 31 reaches the opening 25. Since a portion 34 of the magnet body 32 having a weak magnetic field with uniform spacing between the magnets is located in the opening 25, the developer falls off and is removed from the rotating sleeve 31 by its own weight.

As described above, in the developing device 1, the magnet body 32 of the magnet roller 3 has one part 34 with a wide gap between the plurality of magnets, and the position of the part 34 is adjusted by the magnetic angle adjustment mechanism 4 into the developer reservoir. 26 and the opening 25 for positioning, the normal developing operation state and the developer discharge state can be changed by simply adjusting the magnetic angle of the magnet body 32 of the magnet roller 3. Therefore, it can be set.

Developing device 1 equipped with such a magnetic angle adjustment mechanism 4
After the developer containing the worn or deteriorated carrier is discharged, the magnetic angle of the magnet body 32 of the magnet roller 3 is adjusted to the developing operation state, and the developer containing the new carrier is loaded and the recording device is started. It can be attached and installed.

The structure for attaching the developing device to the recording device is, for example, shown in FIG. 7, which was developed separately by the present inventor, in which the developing device 1 is attached to a support frame 6 for a photoreceptor (not shown). be. That is, in the developing device 1, the guide receiving member 5 provided so as to surround the magnetic angle adjustment mechanism 4 engages with the guide member 7 provided on the support pedestal 6, and is mounted in the direction of the arrow and at a predetermined position. It will be done. At this time, in the developing device 1, since the guide receiving member 5 protrudes from the side plate 23 of the casing 2 more than the magnetic angle adjustment mechanism 4, no matter what direction the magnetic angle adjustment plate 44 of the magnetic angle adjustment mechanism 4 is. is also mounted and attached in place. That is, the magnet body 32 of the magnet roller 3
The position in which the widely spaced portion 34 between the magnets excludes developer, i.e. the opening 25 of the casing 2
Even when the developing device 1 is located at a predetermined position on the support pedestal 6, even when it is not at a predetermined position in the developer reservoir 26 of the casing 2. As a result, when the developing operation is performed in these cases, the magnetic angle of the magnet body 32 is not adjusted to the proper angle for the developing operation, so the image formed on the photoreceptor may be distorted or the image may be distorted due to toner scattering. There was a problem in that good image quality could not be obtained due to stains and other problems.

In order to solve the problems in the mounting structure of the developing device which was separately developed by the present inventor as described above, the present invention provides a recording device that removes the developer and installs the developing device loaded with a new carrier and developer containing toner. It is an object of the present invention to provide a developing device in which the magnetic angle of a magnet body can be accurately adjusted when it is attached to a developing device.

[Structure of the invention]

In order to achieve the above-mentioned object, the present invention provides for mounting a developing device at a predetermined position on the main body of a recording device such as an electrophotographic copying machine while the magnetic angle adjustment mechanism adjusts the magnetic body to a regular magnetic angle at the time of development. The developing device is characterized in that it is capable of performing the following steps.

That is, the configuration of the first invention includes a rotary sleeve and a magnet body in which a plurality of magnets are arranged in the circumferential direction inside the rotary sleeve to attract the developer onto the rotary sleeve and also form a part for releasing the attraction. a casing having an opening and accommodating the magnet roller facing the opening; and a developing device with the position of the part releasing the attraction opposite to the carrier replacement position on the side of the opening. and a magnetic angle adjustment mechanism that is removably attachable to a recording device, the magnetic angle adjustment mechanism determining the installation phase of the magnet body in a manner that is switchable between the magnetic angle adjustment mechanism and the magnetic angle adjustment mechanism. The developing device can be attached to the recording device only when the position of the releasing portion is set to the phase at which the developing position is, and when the installation phase of the magnet body is out of the phase, the magnetic angle adjustment mechanism A developing device is characterized in that attachment of the developing device to the recording device is prevented by interference with a device receiving portion or means for fixing the developing device to the recording device. A magnet roller comprising a plurality of magnets disposed in the circumferential direction inside the rotating sleeve to attract the developer onto the rotating sleeve and also forming a part for releasing the attraction; A casing that houses the magnet roller facing the opening, and an installation phase of the magnet body such that the position of the part that releases the attraction can be switched between a carrier exchange position on the opening side and a developing position opposite to the opening. In a developing device that is removably attached to a recording device, the magnetic angle adjustment mechanism is provided such that the installation phase of the magnet body in the developing device receiving portion of the recording device is such that the position of the part that releases the attraction is the developing position. By providing an acting member to the magnetic angle adjustment mechanism that makes the phase deviate from the
In the developing device, when inserted into a recording device, the magnetic angle adjustment mechanism sets the installation phase of the magnet body to a phase in which the position of the portion releasing the attraction is the position during development.

Since the present invention has the above configuration, after removing the developer containing a worn or deteriorated carrier from the developing device and loading the developer containing a new carrier,
When the developing device is installed in the predetermined position of the recording device, the magnetic angle adjustment mechanism has adjusted the magnetic body to the correct magnetic angle during development, and the developing device is in a state where the magnetic angle of the magnetic body is inaccurate. The printer is not installed at a predetermined position on the recording device in an incorrect state.

That is, in the first invention, when the magnetic body is adjusted to a regular magnetic angle during development by the magnetic angle adjustment mechanism, the developing device can be mounted at a predetermined position of the recording device. However, if you forget to operate the magnetic angle adjustment mechanism, or if the operation is inaccurate and the magnet body is not adjusted to the proper magnetic angle, the developing device cannot be installed in the designated position of the recording device. Therefore, it can be detected that the magnetic angle of the magnet of the developing device is not adjusted to the normal state. Therefore, by operating the magnetic angle adjustment mechanism again and adjusting the magnetic angle of the magnet body to a normal state, the developing device can be mounted and attached to a predetermined position of the recording device.

Further, the second invention is such that the magnetic angle adjustment mechanism is activated when the developing device is attached to the recording device, and adjusts the magnetic angle of the magnet body to the normal value when the developing device is attached and attached to a predetermined position of the recording device. The magnetic angle of the magnet body is automatically adjusted.

As mentioned above, if the magnetic angle adjustment mechanism is activated before the developing device is attached to the recording device,
If you forget to operate it or the magnetic angle adjustment is inaccurate, it is possible to detect that the magnetic angle adjustment is inappropriate and readjust it when attaching the developing device to the recording device. If the magnetic angle adjustment mechanism is activated when the developing device is attached to the recording device,
The magnetic angle is automatically adjusted to the normal state when the developing device is installed in the specified position of the recording device, so the developing device can be installed in the specified position of the recording device even if the magnetic angle is inaccurate. without being installed,
Good image quality can be obtained without causing problems such as deformation of the image or staining due to toner scattering during the developing operation.

〔Example〕

The present invention will be explained in detail by way of examples.

In addition, in each embodiment, the same reference numerals as in the conventional one are used for the same members.

(Example ) An embodiment will be explained based on FIG.

1 is a developing device, 2 is a casing, 23 is,
This is the side plate of the casing. Reference numeral 4 denotes a magnetic angle adjustment mechanism provided on the side plate of the casing, and the amount of protrusion from the side plate of the casing is set to be larger than that of the guide light receiving member 5 provided adjacently. Reference numeral 6 denotes a pedestal for supporting a photoreceptor (not shown), and includes a guide member 7 and a groove 8 provided between the guide member 7.

When the developing device 1 is attached to a predetermined position on the pedestal 6 that supports the photoreceptor, the developing device 1 is moved by the guide receiving member 5 engaging with the guide member 7 of the pedestal 6 that supports the photoreceptor. However, if the magnetic angle of the magnet body is adjusted to a normal state, that is, as shown in the figure, the magnetic angle adjustment plate 4 of the magnetic angle adjustment mechanism 4
When the protrusion 47 of 4 is adjusted, the protrusion 47 engages with the groove 8 of the pedestal 6 that supports the photoreceptor, so that the developing device 1 is mounted and attached at the predetermined position.

However, if the magnetic angle of the magnet body is not adjusted to a normal state, that is, if the protrusion 47 of the magnetic angle adjustment plate 44 of the magnetic angle adjustment mechanism 4 is in a different state from that shown in the drawing, the developing device 1 Even if an attempt is made to attach the photoreceptor to the pedestal 6 that supports the photoreceptor, the protrusion 47 of the magnetic angle adjustment plate 44 hits the edge of the pedestal 6 without engaging the groove 8 of the pedestal 6. I can't. Therefore, if you try to mount the developing device 1 on the pedestal 6 that supports the photoconductor, but it is not possible, you may have forgotten to operate the magnetic angle adjustment mechanism, or the operation may be inaccurate. If it is detected that the magnetic angle of the body is not adjusted to the normal state, the magnetic angle adjustment mechanism is operated again to correct the magnetic angle of the magnet body to the normal state.

As described above, if the magnetic angle of the magnet body is not adjusted properly, the protrusion of the magnetic angle adjustment plate of the magnetic angle adjustment mechanism will not engage with the groove of the pedestal that supports the photoreceptor. It is possible to prevent the developing device from being attached to a predetermined position of the mount that supports the photoreceptor.

(Example ) An embodiment will be explained based on FIG. 9.

Reference numeral 4 denotes a magnetic angle adjustment mechanism, which has a length in which the protrusion 45 of the magnetic angle adjustment plate 44 protrudes from the back plate of the casing 2 at a position where it abuts the positioning abutment 42 of the magnetic angle adjustment board 41. are doing. Reference numeral 9 denotes a main body of the copying machine, which has a groove 10 extending in the direction in which the developing device is mounted.

When installing the developing device 1 in a predetermined position of the copying machine main body 9, if the magnetic angle of the magnet body is adjusted to the normal state, that is, as shown in the figure, the magnetic angle adjustment plate of the magnetic angle adjustment mechanism 4 When the protrusion 45 of 44 is in contact with the positioning abutment 42, the end of the protrusion 45 engages with the groove 10 of the copying machine main body 9, so that the developing device 1 is moved to the predetermined position. It is attached and attached to.

However, if the magnetic angle of the magnet body is not adjusted to the normal state, that is, if the protrusion 45 of the magnetic angle adjustment plate 44 of the magnetic angle adjustment mechanism 4 is in the state shown by the dotted line in the figure, The developing device 1 is connected to the copying machine main body 9.
Even if you try to attach it to the magnetic angle adjustment plate 44, the protrusion 4
5 does not engage with the groove 10 of the main body 9 of the copying machine and abuts against the edge thereof, so that it cannot be installed in the predetermined position.

As described above, similarly to the embodiment, if the magnetic angle of the magnet body is not adjusted to the normal state, it is possible to prevent the developing device from being installed at a predetermined position on the main body of the copying machine. .

(Example ) An embodiment will be explained based on FIGS. 10 and 11.

4 is a magnetic angle adjustment mechanism, and a magnetic angle adjustment board 4
1 and a magnetic angle adjusting plate 44 rotatably positioned on the substrate 41. The magnetic angle adjustment plate 44 is a first positioning abutment 4 provided on the magnetic angle adjustment board 41.
A protrusion 45 is provided which determines the magnetic angle during the developing operation by abutting on the protrusion 45 . Moreover, the protrusion 45
is provided with a wide member 45' at its end.
Reference numeral 11 denotes a fixing bolt for attaching the developing device 1, and is attached to a mounting leg member 12 of the developing device 1.

When the magnetic angle of the magnet body is adjusted to the normal state, the protrusion 45 of the square adjustment plate 44 touches the first positioning abutment 42 of the magnetic angle adjustment board 41, as shown in FIG. It is in contact. After attaching the developing device 1 to the copying machine main body in this state, fix the fixing bolt 1
1, the developing device 1 can be attached to the main body of the copying machine. However, if the magnetic angle of the magnet body is not adjusted to a normal state, for example, as shown in FIG. If the fixing bolt 45' is located above the fixing bolt 11, even if you try to tighten the fixing bolt 11 after installing the developing device in the copying machine main body, the wide member 45' of the protrusion 45 will not be located above the fixing bolt 11. Therefore, it cannot be tightened and the developing device 1 cannot be attached to the main body of the copying machine.

As described above, similarly to the embodiment, if the magnetic angle of the magnet body is not adjusted to the normal state, it is possible to prevent the developing device from being installed at a predetermined position on the main body of the copying machine. .

(Example ) An embodiment will be explained based on FIGS. 12 and 13.

1 is a developing device, 2 is a casing, 23 is,
The side plate 4 of the casing is a magnetic angle adjustment mechanism provided in the casing 2, which includes a magnetic angle adjustment board 41 fixed to the side plate 23 of the casing 2, and a magnetic angle adjustment plate 44 rotatably positioned on the board 41. Consists of. The magnetic angle adjustment plate 44 is rotatably guided by the guide member 14 provided on the magnetic angle adjustment board 41, and is a protrusion that determines the magnetic angle during development operation by abutting against the positioning abutment 42. It is equipped with 45. Further, the magnetic angle adjustment plate 44 has only its protrusion 47 connected to the guide receiving member 5 provided adjacent to the magnetic angle adjustment mechanism 4.
The amount of protrusion of the casing 2 from the side plate 23 is set to be larger than that of the casing 2. 6 is a photoreceptor (not shown)
It is a pedestal that supports a guide member 7 and an elastic body 15 provided on the guide member 7.

When the developing device 1 is mounted on the pedestal 6 that supports the photoconductor and moved in the direction of the arrow, the developing device 1 is adjusted to the developing operating state as shown in a, b, and c in FIG. 13. The magnetic angle adjustment plate 44 of the magnetic angle adjustment mechanism 4, which does not have the magnetic angle adjustment mechanism 4, is sequentially rotated when its protrusion 47 contacts and is pressed by the elastic body 15, and the normal magnetic angle is adjusted. That is, the magnetic angle adjustment plate 44
is rotated until the projection 45 comes into contact with the positioning abutment 42 of the magnetic angle adjustment board 41, and is pressed and held by the elastic body 15 when mounted at a predetermined position.

As described above, before mounting the developing device 1 on the pedestal 6 that supports the photoreceptor, the magnetic angle adjustment mechanism 4 is
The magnetic angle adjustment mechanism 4 is automatically operated in the process of mounting and attaching the developing device 1 to the pedestal 6 that supports the photoreceptor without adjusting the magnetic angle of the developing device 2 to a normal state.

Note that even when a cam member is used instead of the elastic body, the magnetic angle adjustment mechanism is operated in the same manner, and the magnetic angle of the magnet body is adjusted in a normal state.

〔Effect of the invention〕

In the present invention, the developing device can be attached to a predetermined position of the recording device while the magnetic angle adjustment mechanism is adjusting the magnet body to a regular magnetic angle, so that the developing device can be attached to the recording device. For those equipped with a magnetic angle adjustment mechanism for adjusting the magnetic angle of the magnet body,
If the magnetic angle adjustment mechanism is forgotten to operate or is operated inaccurately, the developing device cannot be attached to a predetermined position of the recording device. In addition, if the magnetic angle adjustment mechanism does not adjust the magnetic angle of the magnet before installing the developing device in the recording device, the magnetic angle adjusting mechanism is activated during the process of installing the developing device in the recording device. When the developing device is installed at a predetermined position of the recording device, the magnetic angle of the magnet body is adjusted to a normal state.

As mentioned above, when the developing device is installed in a predetermined position of the recording device, the magnetic angle of the magnet body is adjusted to the normal state, so there is no possibility that the image shape will be distorted or the toner will scatter during the developing operation. Good image quality can be obtained without causing problems such as staining due to twisting.

[Brief explanation of drawings]

FIG. 1 is an overall perspective view of a conventional developing device, and FIG.
The figure is a sectional view of the magnet roller mounting part in Fig. 1, Figure 3 is an enlarged side view of the magnet roller mounting part in Fig. 2 during normal operation, and Fig. 4 is a developer discharge. 2 is an enlarged side view of the mounting portion of the magnet roller during normal operation, FIG. 5A is a sectional view showing the position of the magnet roller in FIG. 1 during normal operation, and FIG. Another corresponding example, FIG. 6 is a sectional view showing the position of the magnet roller in FIG. 1 during developer discharge, and FIG. 7 is a perspective view showing the relationship between a conventional developing device and a drum mount. 8 is a perspective view of the first embodiment, FIG. 9 is a perspective view of the second embodiment, FIG. 10 is a partially enlarged view of the developing device with magnetic angle adjustment of the third embodiment, and FIG. The figure is a partially enlarged view of the developing device in which the magnetic angle is not adjusted according to the third embodiment, FIG. 12 is a perspective view of the fourth embodiment, and FIG. 13 is an explanatory diagram of the operating state of the fourth embodiment. be. DESCRIPTION OF SYMBOLS 1... Developing device, 2... Casing, 3... Magnetic roller, 4... Magnetic angle adjustment mechanism, 5... Guide receiving member, 6... Mount supporting photoreceptor, 7...
Guide member, 8... Groove, 9... Copying machine main body, 10...
...Groove, 11...Fixing bolt for mounting the developing device,
12... Attachment leg member of the developing device, 13... Elastic body, 14... Guide member for the magnetic angle adjustment plate 44, 21...
...Top lid of the casing, 23...Side plate of the casing, 31...Rotating sleeve, 32...Magnet, 3
3...Magnet, 34...Part with wide spacing between magnets,
34'...A part where magnets of the same polarity are arranged in parallel, 41...
...Magnetic angle adjustment board, 42...First abutment part, 44...
Magnetic angle adjustment plate, 45... protrusion, 47... protrusion.

Claims (1)

[Scope of Claims] 1. A magnet comprising a rotating sleeve and a magnet body having a plurality of magnets arranged in the circumferential direction inside the rotating sleeve to attract developer onto the rotating sleeve and also forming a part for releasing the attraction. a magnet roller, a casing having an opening and accommodating the magnet roller facing the opening, and a position of the part for releasing the attraction at a developing position opposite to a carrier replacement position on the opening side. and a magnetic angle adjustment mechanism that is removably attachable to a recording device, the magnetic angle adjustment mechanism determining the installation phase of the magnet body in a manner that allows the magnetic angle adjustment mechanism to change the installation phase of the magnet body to release the attraction. The developing device can be installed in the recording device only when the position of the part is in the phase corresponding to the developing position, and when the installation phase of the magnet body is out of the phase, the magnetic angle adjustment mechanism is installed in the developing device receiving portion of the recording device. Alternatively, a developing device is characterized in that the developing device is prevented from being attached to the recording device by interfering with means for fixing the developing device to the recording device. 2. A magnet roller consisting of a rotating sleeve and a magnet body having a plurality of magnets disposed in the circumferential direction inside the rotating sleeve to attract the developer onto the rotating sleeve and also forming a part for releasing the attraction, and an opening. a casing for storing the magnet roller facing the opening; and a casing for storing the magnet roller facing the opening, and the magnet so that the position of the attraction releasing portion can be switched between a carrier exchange position on the opening side and a developing position opposite to the opening. In a developing device that is detachably attached to a recording device, the developing device is provided with a magnetic angle adjustment mechanism that determines the installation phase of the magnet body, and the position of the part that releases the attraction is set in the developing device receiving part of the recording device. By providing an action member for the magnetic angle adjustment mechanism that sets the phase to be out of the developing position, the magnetic angle adjustment mechanism changes the installed phase of the magnet from the attraction when inserted into a recording device. A developing device characterized in that the position of the released portion is set in a phase such that it is in a position during development.