JPH11133691A - Image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming device constituted so that an electrical control circuit unit is dispersedly arranged in plural places in a device body and a motor control circuit can be attached/detached together with a control base board arranged fro a driving motor for driving a driving mechanism for the device body. SOLUTION: The electrical control circuit is dispersed on plural control circuit boards and arranged in the device body, the driving motor 17 for supplying driving force to a driving force supplying gear provided on the side of the device body and a driving motor control circuit board 16 are arranged to make them integral, so that one of the plural control circuit boards is constituted. It is constituted so that the rotor part of the driving motor 17 is provided on one surface of the control circuit board 16 and the motor 17 is attachable to/detachable from the device body, together with the circuit board 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive motor for distributing an electric control circuit to a plurality of control circuit boards and arranging the electric control circuits in a main body of the apparatus, and supplying a driving force to a drive mechanism of the main body of the apparatus. The present invention relates to an image forming apparatus which is controlled by one of the methods described above, is configured integrally with each other, and is detachable from the apparatus main body.

[0002]

2. Description of the Related Art Generally, an image forming apparatus includes a recording paper transport mechanism, an image transfer mechanism, and an image fixing mechanism for transferring an image formed on the surface of a photoreceptor drum onto recording paper and stacking the recording paper on a tray. And the like, a non-driving member supporting them, an electric control circuit for controlling the driving of the driving member, and the like.

[0003] The drive mechanism uses a motor as a drive source,
Since the drive mechanism members are connected to and driven by the respective drive mechanism members via the reduction gear train, it is desired that the drive mechanism members be periodically cleaned and lubricated.

[0004] Further, the electric control circuit repeatedly cuts off the supply of electric power to electric members to control ON / OFF of the motor and other electromagnetic solenoids. In some cases, the intermittent driving of the members may reduce or disable the responsiveness and require replacement.

[0005] For such a reason, the image forming apparatus requires a service of maintenance and inspection and replacement of members, and it is necessary to configure each member so that replacement can be easily performed. Therefore, it is desired to provide products to customers at the lowest total cost, considering the products and services comprehensively.

On the other hand, among the driving mechanism members, those which are exposed to a high temperature such as a fixing mechanism, those which are exposed to a high pressure such as a developing device, and those which convey a recording sheet to a predetermined position at a high speed. Since the durability varies depending on the purpose and the material, such as a mechanism, it is desirable to unitize those having similar durability in consideration of the recording paper processing amount, aging and the like.

[0007]

Therefore, it is conceivable that all the electric control circuit units are integrated into one unit and integrated with the control panel on the back of the control panel on which the control buttons and the like on the surface of the apparatus are arranged. But in this case,
As the size of the unit increases, the degree of freedom in design is lost due to the limitation of the back surface of the control panel or the vicinity thereof, which causes a problem that the size of the image forming apparatus increases.

For this purpose, the electric control circuit unit is divided into a plurality of units, and the plurality of units are disposed in a dead space between a driving mechanism and a non-driving mechanism. By creating a storage space for a plurality of units, if the plurality of units are stored in the space, it is expected that the apparatus main body can be provided without increasing the size.

In view of the above-mentioned circumstances, the present invention provides an electric control circuit unit which is distributed in a plurality of units in an apparatus main body, and further includes a control board disposed on a driving motor for driving a driving mechanism of the apparatus main body. It is an object to provide an image forming apparatus in which a motor is configured to be detachable. Another object of the present invention is to provide an image forming apparatus having the control board serving as a relay board connected to another control unit or an electric member. Also,
Another object of the present invention is to provide an image forming apparatus in which various patterns on the control board are rationally arranged in the control board to which the drive motor terminal, the electromagnetic clutch, and the cooling fan terminal are connected. It is.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and the first invention of the first invention has the following features.
In an image forming apparatus in which an electric control circuit is dispersed in a plurality of control circuit boards and arranged in the apparatus main body, a driving force supply gear for driving a driving mechanism of the apparatus main body is provided on the apparatus main body side, and the driving force supply gear is provided. A drive motor for supplying a driving force to the motor control circuit board, forming one of the plurality of control circuit boards, and providing a rotor portion of the drive motor on one side of the control circuit board. The rotation shaft of the drive motor penetrates the control circuit board and communicates with the drive power supply gear on the other surface to transmit the rotational drive force. A mounting plate that is detachable from the main body, a stator mounting portion of the drive motor is fixed to the control circuit board together with the mounting plate, and the drive motor and the control circuit board are mounted on the apparatus body. Characterized by being configured removably to Te.

Here, the fact that the rotary shaft of the drive motor penetrates the control circuit board and communicates with the drive force supply gear on the other surface side means, for example, as shown in FIG. Not only when the driving force is transmitted by engaging the pinion 17a with the power transmission gears 36 and 59, but also when the driving force is transmitted in a non-contact manner by the magnetic coupling.

According to the first aspect of the present invention, the electric control circuit is dispersed in a plurality of control circuit boards and arranged in the apparatus main body, and the drive motor is detachably mounted on the apparatus main body together with the control circuit board. Therefore, the drive motor and the control circuit board can be attached and detached as an integrated unit. If the unit is prepared by adjusting the speed integrally with the drive motor in advance, only the drive motor or only the control circuit board is replaced. As in the case, the drive motor does not need to be adjusted, and can be replaced by the unit body as needed at the time of maintenance and inspection or during assembly, and the replacement process can be easily performed.

[0013] The present invention further provides a mounting plate which is detachable from the apparatus main body on the other surface side of the control circuit board, and a stator mounting portion of the drive motor is fixed to the control circuit board together with the mounting plate. However, the mounting plate may be an electric conductor or an insulator as long as the rotor of the drive motor and the rotating shaft fixed to the rotor are positioned.

The stator mounting portion of the drive motor may be directly fixed to the control circuit board. However, since the control circuit board usually has a circuit pattern printed on both sides of the insulating plate, a metal plate is attached to the insulating circuit board. In the case of forming in a sandwich state, the cost increases, so by providing the mounting plate, the cost can be further reduced.

According to a second aspect of the present invention, the control circuit board may include a connector for connecting to another control circuit board and / or an electric member.
This is an effective means of the invention. According to a third aspect of the present invention, in a state where the control circuit board is mounted on the apparatus main body side, a support body for directly or indirectly supporting the other surface of the control circuit board with the apparatus main body, and / or It is desirable to provide a supporting portion supported by the mounting plate. According to a fourth aspect of the present invention, a connector for connecting to another control circuit board and / or an electrical member is disposed near an outer edge of the control circuit board and near a support and / or the support portion. It is more preferable to configure them.

When a connector is provided on the control circuit board, the control circuit board can be used as a relay board with another control circuit board and / or an electric member, and therefore, can be assembled without using a long harness. Work is simplified,
Costs can be reduced.

Further, in the present invention, the support which directly or indirectly supports the apparatus main body and / or the support which is supported by the mounting plate may be, for example, as shown in FIG. Support 49 which is bent and extended to the portion
“e” abuts on the back surface (the other surface) 16 b of the control circuit board 16 to support the board 16, but is not limited thereto, and extends directly from the side wall 31 of the apparatus main body to which the ground plate 49 is attached. It means that it may be something.

The bent upright portion (support portion) 77a of the mounting plate 77 is connected to the back surface (the other surface) 16b of the control circuit board 16.
The support circuit board 16 is supported by the mounting plate 77. The mounting plate 77 extends to the support 49e, and the mounting plate 77 is used instead of the support 49e. Means that the control circuit board 16 may be supported by the supporting portion.

As described above, the first invention provides the support,
Since the control circuit board is supported from the back side by the support section, the connector can be pulled out by holding down the surface of the support portion with a tool or hand, and the connector can be easily detached from the control circuit board. It is.

By arranging the connector near the outer edge of the control circuit board, it is possible to shorten the harness from the other control circuit board and / or a partner such as an electric member. The wiring of the mating connector portion can be slightly bent so that the connector portion can be separated from the control circuit board, and the control circuit board can be removed without being disturbed by the connector portion.

According to a fifth aspect of the present invention, a locking member engages and disengages a rotating body for driving and stopping a driving motor for driving a driving mechanism of the apparatus main body and a conveying roller for conveying a recording sheet. And a cooling fan for cooling the inside of the apparatus main body, the power supply for the solenoid and the power supply for the cooling fan are separately provided, and one terminal of the solenoid is connected to the drive motor. And the connection between the other terminal of the solenoid and the other terminal of the common power supply is controlled in accordance with the recording paper conveyance state. It is characterized by having done.

According to the second invention, for example, as shown in FIG. 7, the solenoids (21, 22) and the cooling fan 4
3 is provided separately by 81 and 82, and one terminal (89a, 90
a) can be connected to one terminal 81a of a common power supply applied to the drive motor 17 via a switch 94. Then, the other terminal of the solenoid (89b.
The connection between the terminal 90b) and the other terminal (ground end) of the common power supply is made by switches 95, 96 according to the recording paper conveyance state.
It is configured to be controlled by:

Therefore, the solenoid 21 or 2
When 2 is turned off, a back electromotive force is generated at the turned off terminal. However, since the fan 43 uses a power supply different from that of the solenoid, it is not possible to use the same pattern as the solenoid on the control circuit board. In addition, since the back electromotive force is not applied to the fan 43, the value of the current flowing through the fan 43 does not change, and the rotation of the fan 43 does not become irregular and does not hinder cooling.

[0024]

Embodiments of the present invention will be illustratively described in detail below with reference to the drawings. However, unless otherwise specified, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention, but are merely illustrative examples. It's just

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a configuration perspective view showing an embodiment of an image forming apparatus according to the present invention. In FIG. 1, a frame formed by side walls 30 and 31 is provided in the image forming apparatus 1, and a conveyance path 50 (a central space 46 notch) for conveying recording paper is provided in the frame. 51 are provided, and transport paths 50 and 51 are provided.
Between the holding plate 5 and the holding plate 5 for holding up the rising of the recording paper.
8, a registration roller (18, 23), an optical unit 5 having an optical path below and above the transport path 51 and projecting image information on the photosensitive drum 9 of the cartridge 2, and a transfer roller 47 are disposed. A registration sensor 45 is disposed in the space 46 on the upstream side of the pressing plate 58, and an electrical connector 52 is disposed below the side wall 30.

The guide groove 33 serving as a guide when the cartridge 2 is mounted on the apparatus main body is formed in the side wall 30 by the groove 3.
2 and 44 are provided on the side wall 31. Also, the side wall 31
A drive control unit 14 for controlling transmission of driving force to the apparatus main body and the drive mechanism of the cartridge 2 is detachably provided.

The drive control unit 14 has a rotor pinion 17a of the motor 17 rotatably disposed therein,
Various gears and relays 2 connected to the rotor pinion 17a
1, 22, a metal base plate 49 provided with a contact piece 35 for grounding the photosensitive drum shaft, an electric control board 16 for controlling the motor 17, and a temperature inside the machine including the control board 16 Fan 43 that emits heat to cool it
The control board 16 has a wiring pattern,
A connector, an electric circuit component, a cooling plate for dissipating heat generated by the electric circuit component, and the like are provided.

FIG. 2 is a view of the drive control unit 14 as viewed from the back. A pinion 17a extending from the rotor of the motor 17 rotatably mounted on the main plate 49 meshes with a power transmission gear 36 having an electromagnetic clutch. The gear 36 is connected to an intermediate gear 37 and an intermediate gear 38 via an electromagnetic clutch. Is engaged. The intermediate gear 37 is attached to a shaft of the transfer roller 47, and is arranged to rotate the transfer roller 47 and to mesh with a drum gear (not shown) of the photosensitive drum 9 provided in the cartridge 2 described above. .

The other intermediate gear 38 meshing with the power transmission gear 36 is arranged to mesh with a developing device gear (not shown) provided on the cartridge 2 via the intermediate gear 39 and the intermediate gear 40. . The intermediate gear 39 meshes with the registration gear 26, and the large-diameter registration roller 23 and the small-diameter registration roller 18 are connected via a one-way clutch (not shown).
Is configured to be rotatable.

The intermediate gear 39 meshes with the paper feed gear 28 connected to a paper feed roller (not shown) via an electromagnetic clutch to transfer recording paper from the paper feed cassette to the registration rollers (1).
8, 23). The intermediate gear 37 is connected to a gear 60 via an electromagnetic clutch, and the gear 60 is connected to gears 61, 62, and 63. From these gears, a fixing roller gear (not shown) for recording paper and a tray 6 are connected. Connected to the paper feed gear. Also, the motor 17
A driving force supply gear 59 that meshes with the pinion 17a extending from the rotor of No. 1 is connected to a pickup roller driving gear from a recording paper storage cassette (not shown).

As described above, the power transmission gear 36, which meshes with the output gear (pinion 17a) provided on the rotor of the motor 17 and transmits the rotational driving force, transmits the power of the photosensitive drum via one intermediate gear 37. System and multiple intermediate gears (3
8, 39, 40) and a developing device power transmission system to provide a two-system power transmission system so that the driving force is transmitted, and the drive gear on the cartridge side is not shown in the drawings. A developing device side driving gear connected to a developing device power transmission system and the photosensitive drum side gear connected to the photoconductor drum power transmission system are arranged side by side and independently arranged, and the cartridge 2 is mounted on the apparatus. When mounted on the main body, the developing device side driving gear and the photosensitive drum side gear mesh with the two-system power transmission system.

Accordingly, since the driving force is transmitted from the power transmission gear 36 to the photosensitive drum 9 by the photosensitive drum power transmission system via one intermediate gear 37, the driving force is transmitted with a small gear train. Thus, the load torque is reduced, and the rotation of the photosensitive drum is accurately performed.

In the developing device 10, the driving force is used to stir the toner in the developing device and to transfer the toner to the photosensitive drum side. The driving force is transmitted by a developing device power transmission system via a plurality of intermediate gears. There is no effect even if the backlash or torque drops, and the position of the developing device gear is arranged at an arbitrary position with respect to the position of the drum gear of the photosensitive drum through a plurality of intermediate gear trains. And the degree of freedom in design is improved.

As shown in FIG. 3, the paper feed gear 28 is connected to a claw 27 formed integrally with the central shaft of the paper feed roller 64 via a clutch (not shown). The crow 27 is provided with an upright surface in the direction of rotation in the form of a ratchet gear around the cylinder, and teeth are cut out from the apex of the upright surface so as to have a gentle surface in the anti-rotation direction. A biased claw plate 66 is disposed, and the claw plate 66 is configured to be capable of engaging and disengaging with the teeth of the claw 27 by the relay 22.
8, the paper feed roller 64 is rotated clockwise by a slight frictional force of the clutch, and the pawl plate 66 is rotated.
When the claw 27 stops, the paper feed roller 64 stops, but can rotate against the frictional force. When the recording paper is pulled by a jam or the like, the paper feed roller 64 moves in the transport direction against the frictional force. Can rotate.

The registration gear 26 is connected to the claw 20 formed integrally with the center shaft of the registration roller 23 via a clutch (not shown). The crow 20 is provided with an upright surface in the rotation direction around the cylinder in the form of a ratchet gear, and teeth are cut out from the apex of the upright surface so as to have a gentle surface in the anti-rotation direction. A biased claw plate 65 is disposed, and the claw plate 65 is configured to be able to engage and disengage with the teeth of the crow 20 by the relay 21.
The clockwise rotation causes the registration roller 23 to rotate clockwise and the registration roller 18 to rotate counterclockwise due to a slight frictional force of the clutch. 23 stops, but can rotate against the frictional force. When the recording paper is pulled due to a jam or the like, the registration rollers 18 and 23 can rotate in the transport direction against the frictional force.

The paper feed roller shaft is rotated by the driving force from the motor 17, and the paper feed roller 64 (FIG. 3A) is rotated to convey the recording paper. On the other hand, when the leading end of the recording paper comes into contact with the registration rollers 18 and 23 to form an appropriate flexure, and the leading end of the recording paper is aligned at right angles to the transport direction, the relay 22 (FIG. 3B) is activated. When turned off, the nail plate 66
The second claw 27 stops rotating by entering the ratchet teeth of the black claw 27.

On the other hand, the leading end of the recording paper is
The relay 21 (FIG. 3B) is turned on until the leading edge of the recording paper is aligned at right angles to the conveyance direction, and the claw plate 65 is moved until the leading edge of the recording paper is aligned at right angles to the conveyance direction. The rotation of the first crow 20 is stopped by entering the ratchet teeth of one crochet 20.

Returning to FIG. 1, the frame constituted by the side walls 30, 31 is covered on the outside with an outer panel 8, and an operation button (not shown) is provided on the right upper surface 8a of the outer panel 8. The part 54 is arranged. The outer panel 8
Between the left upper surface 8b and the right upper surface 8a, a side door 12 having a hinge portion below and openable outward is disposed, and a transport roller is provided between the side door 12 and the outer panel 8. A tray 6 for stacking the recording paper transferred by 55 is formed.

A side frame 11 having a cassette storage 7 is attached to the outside of the transport path 50 so as to be detachable from the outside, and is opened and closed to cover between the upper surface 11a of the side frame 11 and the end surface 8c of the outer panel 8. The door 4 is arranged to be openable and closable by hinges (not shown) provided on the side walls 30 and 31.

Next, the transfer operation of the recording paper will be described. FIG.
, The rotational force from the pinion 17a is
The recording paper is conveyed to the registration rollers (18, 23) by the paper feed roller 64. The relay 21 sucks the claw plate 65 in synchronization with the conveyance of the recording paper, and the tip of the claw plate 65 enters the teeth of the crow 20 and the rotation of the crow 20 is stopped, so that the registration rollers (18, 23) Has stopped.

In this state, since the registration gear 26 continues to rotate but the registration roller is stopped, the clutch interposed between the registration gear 26 and the claw 20 applies a slight rotational force to the claw 20. , And continues to rotate with the resist gear 26 against the frictional force. When the recording paper is detected by the registration sensor 45 and a predetermined time has elapsed, the electromagnetic clutch between the paper feeding roller 64 and the paper feeding gear 28 is disengaged, and the conveyance of the recording paper is stopped.

On the other hand, the photosensitive drum 9 of the cartridge 2 and the mechanism in the developing device 10 are driven by the driving force from the power transmission gear 36, and the image signal light from the optical unit 5 (FIG. When the image formed on the surface is developed and the suction of the relay 21 is released at a predetermined timing, the registration roller immediately applies the recording paper to the photosensitive drum 9 and the transfer roller 47 (FIG. 1) by the driving force urged by the clutch. , And the image on the photosensitive drum is transferred to a recording sheet.
It is loaded on the tray 6 according to FIG.

Next, an operation of removing the drive control unit 14 from the apparatus main body will be described. In FIG. 1, the front door 13
Is opened, the drive control unit 14 appears. As shown in FIG. 3B, the unit 14 has screw holes 49a to 49d of the main plate 49 fixed to the apparatus main body with screws.

A mounting plate 77 is removably mounted on the drive control unit 14 by screw holes 77b to 77e. A motor control board 16 is fixed to the mounting plate 77. 87 to 90 are arranged.

When the connectors 87 to 90 are disconnected and the screws in the screw holes 49a to 49d are removed, the drive control unit 14 can be lifted vertically upward in FIG. 3B. When the drive control unit 14 is pulled up, the power supply is turned off, so that the claw plate 65 of the relay 21 is pulled by the spring SP and is disengaged from the ratchet 20, but the relay 22 is turned off by the spring SP. And the ratchet 27 is engaged.

When the drive control unit 14 is lifted vertically upward, the tip of the claw plate 66 of the relay 22 slides on the bottom of the ratchet 27, and the intermediate gear 39 disposed on the apparatus main body side of the drive control unit 14 is disengaged. , Resist gear 26
In addition, since the root of the feeding gear 28 is smaller in diameter than the roots of the ratchets 20 and 27, the drive control unit 14 can be taken out without being obstructed by these ratchets.

That is, the motor control circuit board 16 is provided with an opening 16c (FIG. 6) through which the stator mounting portion of the drive motor 17 can penetrate from the back side to the front side. The stator mounting part is fixed,
A mounting plate 77 is fixed to the stator mounting portion on the back side of the motor control board 16. Since the mounting plate 77 is detachably attached to the drive control unit 14, the motor control board 16 can be detached from the drive control unit 14 while the drive control unit 14 is attached to the apparatus body. Can be.

As shown in FIG. 5, the motor control board 16 includes a board-side connector 88 connected to a connector provided at the tip of a lead wire from the fan 43, and a connector provided at the tip of a lead wire from the relay 21. A board-side connector 89 to be connected, a board-side connector 90 to be connected to a connector provided at the end of a lead wire from the relay 22, and a signal line or a power supply line from the main control circuit 83 as shown in FIG. Connectors 87 and the like, which are arranged near the periphery of the motor control board 16.

The upright portion 49e of the base plate 49 supports the motor control board 16 mounted on the base plate 49 in the vicinity of the connectors 89 and 88, and the upright portion 77a of the mounting plate 77 is connected to the connector 87 and the connector 87. Located near 90,
The motor control board 16 is supported.

The bent upright portion (support portion) 77a of the mounting plate 77 is connected to the back surface (the other surface) 16 of the control circuit board 16.
b (FIG. 4) to support the substrate 16, but the mounting plate 77 supports the control circuit board 16 by extending the mounting plate 77 to the portion of the support (standing portion) 49 e of the base plate 49. Thus, the control circuit board 16 may be supported by a support portion of the mounting plate 77 instead of the support 49e, and another upright portion is raised from the main plate 49 instead of the upright portion (support portion) 77a. Alternatively, it may extend directly from the side wall 31 of the apparatus main body to which the main plate 49 is attached.

As described above, since the control circuit board 16 is supported from the back side by the support, the support portion, and the like,
The connector can be pulled out by holding the surface of the supporting portion with a tool or a hand, and the connector can be easily detached from the control circuit board.

Since these connectors are arranged in the vicinity of the outer edge of the control circuit board 16, it is possible to shorten the harness from the other control circuit board and / or a partner such as an electric member, which is economical. In addition, it is possible to bend the wiring of the mating connector portion slightly to keep the connector portion away from the control circuit board, and to remove the control circuit board without disturbing the connector portion. It is possible.

As described above, when the connector is provided on the control circuit board 16, the control circuit board is connected to another control circuit board,
And / or can be used as a relay board with an electrical member. Therefore, the assembly work is simplified without using a long harness.

Next, the motor control board 16 will be described. As shown in FIG. 6, the motor control board 16 formed in a rectangular shape has three connection patterns with a small current capacity at the periphery.
It is surrounded by a pattern P1 connected to the positive pole of the power supply and an earth pole pattern P2. In addition, P1 and P
Non-contact portions between the two are connected by a jumper wire (not shown).

A motor 17 is located at the center on the left hand side of the substrate 16.
Are opened, and patterns P4, P5, P6, and P7 connected to the coils of the stator are opened.
And a Hall element 86 for controlling the rotation speed of the motor 17
The patterns connected to a, 86b, and 86c are arranged inside the substrate 16 and are connected to the motor control IC 85 located on the right-hand side of the substrate 16.

A connector 88 connected to the cooling fan 43 and a connector 89 connected to the solenoid 21 are arranged at the lower right corner of the board 16, and a connector 90 connected to the solenoid 22 is arranged at the upper left corner of the board 16. Placed,
A connector 87 having seven connection terminals is arranged near the left edge of the board 16.

As shown in the block diagram of FIG. 7, the electric circuit for controlling the image control apparatus 1 receives the signal from the motor control board 16, the signal from the operation unit 54, and the signal from the recording paper feed state detecting means 84. A main control circuit 83 for receiving and transmitting a control signal to the motor control board 16 via the connector 87;
And a power supply unit 80 for supplying power thereto. The main control circuit 83 is disposed at the lower part of the apparatus main body, and is connected to an external switch 91 connected to the operation unit 54.
And a power supply section 80 including an AC / DC converter is disposed in the apparatus main body on the side opposite to the motor control board 16.

Then, as shown in FIGS. 6 and 7, the power of the solenoids (21, 22) and the
1 and 82, each of which is provided separately and one terminal (89a, 90a) of the solenoid can be connected to one terminal 81a of a common power supply applied to the drive motor 17 via a switch 94. . The connection between the other terminal (89b.90b) of the solenoid and the other terminal (earth end) of the common power supply is controlled by switches 95 and 96 according to the recording paper conveyance state. I have.

Therefore, the solenoid 21 or 2
When 2 is turned off, a back electromotive force is generated at the turned off terminal. However, since the fan 43 uses a power supply different from that of the solenoid, it is not possible to use the same pattern as the solenoid on the control circuit board. In addition, since the back electromotive force is not applied to the fan 43, the value of the current flowing through the fan 43 does not change, and the rotation of the fan 43 does not become irregular and does not hinder cooling.

As described in detail above, in the present embodiment, the electric control circuit is distributed over a plurality of control circuit boards and arranged in the apparatus main body, and the drive motor is moved together with the control circuit board to the apparatus main body. The drive motor and the control circuit board can be attached and detached as an integrated unit because they are configured to be detachable, and if this unit is prepared in advance by adjusting the speed integrally with the drive motor, only the drive motor or the control circuit Unlike the case where only the substrate is replaced, there is no need to adjust the drive motor, and the unit can be replaced as necessary at the time of maintenance and inspection or at the time of assembly, and the replacement process can be easily performed.

[0061]

As described above, according to the first aspect of the present invention, the electric control circuit is distributed over a plurality of control circuit boards and is disposed in the apparatus body, and the drive motor is mounted on the apparatus body together with the control circuit boards. The drive motor and the control circuit board are detachable as an integrated unit, and it is necessary to adjust the drive motor as in the case of replacing only the drive motor or only the control circuit board. In addition, the unit can be replaced as needed at the time of maintenance and inspection or during assembly, and the replacement process can be easily performed.

A mounting plate is provided on the other surface side of the control circuit board, and a stator mounting portion of the drive motor is fixed to the control circuit board together with the mounting plate, and the mounting plate is detachable from the apparatus body. By replacing the mounting plate, the motor and the motor control board can be attached and detached as an integrated unit, and if this unit is prepared in advance by adjusting the speed integrally with the drive motor, only the drive motor can be used. It is not necessary to adjust the drive motor as in the case of replacing only the control circuit board, or the unit can be replaced as necessary during maintenance and inspection or during assembly, making the replacement process easy. be able to.

According to a second aspect of the present invention, the control circuit board includes a connector for connecting to another control circuit board and / or an electric member. Provided with a connector, the control circuit board can be used as a relay board with another control circuit board and / or an electrical member. Therefore, the assembly operation is simplified without using a long harness, and the cost can be reduced.

According to a third aspect of the present invention, there is provided a support for directly or indirectly supporting the other surface of the control circuit board with the apparatus body when the control circuit board is mounted on the apparatus body. And / or the support portion supported by the mounting plate is provided, so that the control circuit board can be supported from the back surface side by the support, the support portion, and the like, and the surface of the support portion is formed by a tool or The connector can be pulled out by holding it by hand or the like, and the connector can be easily detached from the control circuit board.

According to a fourth aspect of the present invention, a connector for connecting another control circuit board and / or an electrical member is provided near the outer edge of the control circuit board, and the support body and / or the support portion are provided. Since it is arranged in the vicinity, the harness from the counterpart such as another control circuit board and / or an electric member can be shortened, which is economical. Can be kept away from the control circuit board,
The removal of the control circuit board can be performed without being disturbed by the connector portion.

Further, the second invention described in claim 5 is:
A solenoid for controlling the drive and stop of the transport roller for transporting the recording paper by engaging and disengaging the rotating member and a power supply for a cooling fan for cooling the inside of the apparatus main body are separately provided, and the solenoid is controlled by the solenoid. One terminal is configured to be connectable to one terminal of a common power supply applied to a drive motor that drives a drive mechanism of the apparatus main body, and the other terminal of the solenoid is connected to the other terminal of the common power supply. However, since the control is performed in accordance with the recording paper conveyance state, when the solenoid is turned off, a counter electromotive force is generated at the terminal which is turned off, but the fan does not use the same pattern as the solenoid. Since the back electromotive force is not applied to the cooling fan, the value of the current flowing through the cooling fan does not change, and the rotation of the cooling fan becomes irregular and cooling is performed. It never leads to disabilities.

[Brief description of the drawings]

FIG. 1 is a configuration perspective view showing an embodiment of an image forming apparatus according to the present invention.

FIG. 2 is a rear view of the drive control unit.

FIG. 3A is a perspective view of a drive control unit,
(B) is a front view thereof.

FIG. 4 is a perspective view of the motor control board as viewed from the back.

FIG. 5 is a front view of a motor control board.

FIG. 6 is a circuit pattern diagram of a motor control board.

FIG. 7 is a block diagram of an electric circuit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Image forming apparatus 2 Cartridge 14 Drive control unit 16 Motor control board 17 Motor (drive motor) 36 Drive power supply gear 65, 66 Claw plate (locking means)

Claims (5)

[Claims] 1. An image forming apparatus in which an electric control circuit is dispersed in a plurality of control circuit boards and arranged in an apparatus main body, wherein a driving force supply gear for driving a driving mechanism of the apparatus main body is provided on the apparatus main body side. A drive motor for supplying a driving force to the driving force supply gear is disposed on a motor control circuit board, forming one of the plurality of control circuit boards, and a rotor portion of the drive motor is provided on the control circuit board. Provided on one surface side, the rotating shaft of the drive motor penetrates the control circuit board and communicates with the drive force supply gear on the other surface so as to be able to transmit rotational drive force, and the other surface of the control circuit board A mounting plate that is detachable from the apparatus main body is provided on the side, a stator mounting portion of the drive motor is fixed to the control circuit board together with the mounting plate, and the drive motor is mounted together with the control circuit board. An image forming apparatus characterized in that configured to be able to attach and detach the from the apparatus main body. 2. The image forming apparatus according to claim 1, wherein the control circuit board has a connector for connecting to another control circuit board and / or an electric member. 3. A support for directly or indirectly supporting the other surface of the control circuit board directly or indirectly with the apparatus main body when the control circuit board is mounted on the apparatus main body side, and / or a support for supporting the other surface of the control circuit board by the mounting plate. The image forming apparatus according to claim 1, further comprising a unit. 4. A connector for connecting to another control circuit board and / or an electrical member is disposed near an outer edge of the control circuit board and near a support and / or the support portion. The image forming apparatus according to claim 3. 5. A driving motor for driving a driving mechanism of the apparatus main body, and driving and stopping of a conveying roller for conveying a recording sheet,
In an image forming apparatus in which a locking member is controlled by being disengaged from a rotating body and a cooling fan that cools the inside of the apparatus main body, a power supply for the solenoid and a power supply for the cooling fan are separately provided, One terminal of the solenoid is configured to be connectable to one terminal of a common power supply applied to the drive motor, and the connection between the other terminal of the solenoid and the other terminal of the common power supply is connected to a recording paper. An image forming apparatus, wherein the control is performed according to a conveyance state.