JP3426940B2 - Image forming device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention disperses an electric control circuit in a plurality of control circuit boards and arranges the control circuits in the apparatus body, and a drive motor for supplying a driving force to a drive mechanism of the apparatus body. The present invention relates to an image forming apparatus which is controlled by one of the two, is integrally configured, and is detachable from the apparatus body.

[0002]

2. Description of the Related Art Generally, an image forming apparatus transfers a recording paper image formed on a surface of a photosensitive drum to a recording paper and accumulates the recording paper on a recording paper conveyance mechanism, an image transfer mechanism, an image fixing mechanism. Etc., a non-driving member that supports them, an electric control circuit that controls the driving of the driving member, and the like.

The drive mechanism uses a motor as a drive source.
Since it is driven by being connected to each drive mechanism member via the reduction gear train, it is desired to periodically clean the drive mechanism member and lubricate with lubricating oil.

Further, since the electric control circuit repeatedly cuts off the supply of electric power to the electric member in order to control ON / OFF of the motor and other electromagnetic solenoids, etc., an electric switch and other electric Intermittent driving of the members may reduce or disable the responsiveness and may require replacement.

For these reasons, the image forming apparatus requires maintenance and inspection and member replacement services, and each member must be constructed so that replacement can be performed easily. Therefore, it is desirable to provide the customer with the product at the lowest total cost considering the product and the service as a whole.

On the other hand, among the drive mechanism members, those exposed to high temperatures such as a fixing mechanism, those exposed to high pressure such as a developing device, and conveyance for conveying recording paper to a predetermined position at high speed Since the durability is different depending on the purpose and the material such as the mechanism, it is desirable to collectively unite those having similar durability in consideration of the processing amount of recording paper, 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 plate on the rear surface of the control panel on which the control buttons and the like on the front surface of the apparatus main body are arranged. But in this case,
There is a problem that the size of the image forming apparatus becomes large because the unit becomes large, and the degree of freedom in design is lost due to the limitation of the back surface of the control panel or the vicinity thereof.

Therefore, the electric control circuit unit is dispersed into a plurality of units to dispose the plurality of units in a dead space between a driving mechanism and a non-driving mechanism, or the driving mechanism is positively downsized. It is expected that if a storage space for a plurality of units is created and the plurality of units are stored in that space, the apparatus main body can be provided without increasing the size.

In view of the above-mentioned circumstances, the present invention disposes a plurality of electric control circuit units in a distributed manner in the apparatus main body, and at the same time, together with a control board arranged in a drive motor for driving a drive mechanism of the apparatus main body. An object of the present invention is to provide an image forming apparatus in which a motor is attachable / 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 on the control board to which the drive motor terminal, the electromagnetic clutch, and the terminal of the cooling fan are connected. Is.

[0010]

The present invention has been made in view of the above problems, and in the first aspect of the present invention , the electric control circuits are dispersed in a plurality of control circuit boards and arranged in the apparatus main body. In the image forming apparatus, a drive force supply gear for driving the drive mechanism of the apparatus body is provided on the apparatus body side, and a drive motor for supplying drive force to the drive force supply gear is arranged on the motor control circuit board. , to form one of said plurality of control circuit boards, other rotor portion of said drive motor, provided on one surface of the motor control circuit board, the rotation shaft of the driving motor through the motor control circuit board together form to be able to transmit the rotational driving force in communication with the driving force supplied gear at surface side, the motor control circuit a detachable mounting plate provided to the apparatus main body to the other side of the substrate, the scan of the drive motor Over a data attachment portion secured to the motor control circuit board with the mounting plate, detachably configured with respect to the motor system <br/> apparatus body said drive motor with control circuit board, the motor control circuit board The other
Connector for connecting to control circuit board and / or electric member
Is provided, and the motor control circuit board is mounted on the device main body side.
Put the other side of the motor control circuit board
Abut on the other surface and stand upright supported by the mounting plate.
A support portion is provided, and the connector is connected to the motor control circuit board.
So that it is located near the outer edge of the
It is characterized by having done. The motor control circuit board
Support the other side of the device directly or indirectly
A holder is provided and the connector is arranged near the support.
You may do it.

Here, the fact that the rotary shaft of the drive motor penetrates the control circuit board and communicates with the drive power supply gear on the other surface side means, for example, as shown in FIG. By engaging with the pinion 17a and the power transmission gears 36 and 59, the driving force may be transmitted not only by the magnetic coupling but also 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 together with the control circuit board is detachable from the apparatus main body. Therefore, the drive motor and the control circuit board can be attached and detached as an integrated unit, and if the unit is prepared in advance by adjusting the speed integrally with the drive motor, only the drive motor or only the control circuit board is replaced. As in the case, there is no need to adjust the drive motor, and the unit body can be replaced as needed during maintenance and inspection or during assembly, and the replacement process can be performed easily.

According to another aspect of the present invention, a mounting plate is provided on the other surface side of the control circuit board so as to be attachable to and detachable from the apparatus main body, and the 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 electrical conductor or an insulator as long as the rotor of the drive motor and the rotary 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 circuit patterns printed on both sides of the insulating plate, a metal plate is used as the insulating board. Since the cost is increased by forming a sandwiched state with, the cost can be further reduced by providing the mounting plate.

[0015]

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

Further, in the first aspect of the invention, the motor control is performed.
Attach the other side of the circuit board to the other side and attach it to the mounting plate.
Although there is a standing support part that supports the
By providing a support that directly or indirectly supports
Alternatively, for example, as shown in FIG.
The support 49e that is bent and extends is provided on the control circuit board 16.
The substrate 16 is supported by contacting the back surface (other surface) 16b.
You may do it. And directly or indirectly with the device body
The supporter that supports the target is not limited to this, and means that it may extend directly from the side wall 31 of the apparatus body to which the main plate 49 is attached.

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

As described above, the first aspect of the present invention provides the support,
Since the control circuit board is supported from the back side by the support part, the surface of the support part can be pressed with a tool or hand to pull out the connector, and the connector can be easily detached from the control circuit board. Is.

By arranging the connector in the vicinity of the outer edge of the control circuit board, the harness from the other control circuit board and / or the other party such as an electric member can be shortened, which is economical and It is possible to slightly bend the wiring of the mating connector portion to keep the connector portion away from the control circuit board, and it is possible to remove the control circuit board without being obstructed by the connector portion.

Further, in the present second invention, the drive and stop of conveying rollers for conveying the record sheet, a solenoid locking member is controlled by disengaging the rotating body, cooling for cooling the inside of the apparatus main body A fan is provided, and power sources for the solenoid and the cooling fan are separately provided, and one terminal of the solenoid is configured to be connectable to one terminal of a common power source applied to the drive motor,
The connection between the other terminal and the other terminal of the common power supply of the solenoid, characterized in that form so as to control in accordance with the conveyance condition of the recording paper.

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

Therefore, the solenoid 21 or 2
When 2 is turned off, a counter electromotive force is generated at the turned off terminal, but since the fan 43 uses a power source different from that of Solade, it is not possible to use the same pattern as the solenoid on the control circuit board. Moreover, since the counter 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 so that cooling is not hindered.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be exemplarily described in detail below with reference to the drawings. However, unless otherwise specified, the dimensions, materials, shapes, relative positions, etc. of the components described in this embodiment are not intended to limit the scope of the present invention thereto, but are merely illustrative examples. Nothing more than.

Embodiments 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, the image forming apparatus 1 is provided with a frame body formed by the side walls 30 and 31, and in the frame body, a conveyance path 50 (a notch 46 in the central portion) for conveying recording paper, 51 is provided, and the transport paths 50 and 51 are provided.
Between the and, a pressing plate 5 for suppressing the floating of the recording paper
8, a registration roller (18, 23), an optical unit 5 having an optical path below and above the conveying path 51, and projecting image information onto the photosensitive drum 9 of the cartridge 2, and a transfer roller 47. A registration sensor 45 is arranged in the space 46 on the upstream side of the pressing plate 58, and an electrical connector 52 is arranged below the side wall 30.

The guide groove 33, which serves as a guide when the cartridge 2 is mounted on the main body of the apparatus, has a groove 3 on the side wall 30.
2, 44 are provided on the side wall 31. Also, the side wall 31
A drive control unit 14 that controls the transmission of the drive force to the drive mechanism of the apparatus main body and the cartridge 2 is detachably disposed in the.

In the drive control unit 14, the rotor pinion 17a of the motor 17 is rotatably arranged, and
Various gears and relays 2 connected to the rotor pinion 17a
1, 22, a metal base plate 49 on which a contact piece 35 for grounding the photosensitive drum shaft is arranged, an electric control board 16 for controlling the motor 17, and an internal temperature of the machine including the control board 16. Fan 43 that radiates heat to the outside for cooling
And a wiring pattern on the control board 16,
A connector, an electric circuit component, a cooling plate that dissipates heat generated by the electric circuit component, and the like are provided.

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

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

Further, the intermediate gear 39 meshes with a sheet feeding gear 28 connected to a sheet feeding roller (not shown) via an electromagnetic clutch, and the recording sheet from the sheet feeding cassette is registered with the registration roller (1).
8 and 23). Further, the intermediate gear 37 is connected to a gear 60 via an electromagnetic clutch, and the gear 60 is connected to gears 61, 62, 63. From these gears to a fixing roller gear (not shown) of recording paper and a tray 6. Is connected to the paper feed gear. In addition, the motor 17
The drive force supply gear 59 meshing with the pinion 17a extending from the rotor is connected to a pickup roller drive gear from a recording paper storage cassette (not shown).

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

Therefore, 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 number of gear trains. As a result, the load torque is reduced, and the photosensitive drum is driven with high precision.

Further, in the developing device 10, the driving force is used for agitating the toner in the developing device and transferring the toner to the photosensitive drum side, but by the developing device power transmission system through a plurality of intermediate gears. The backlash and torque are not affected, 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 by interposing a plurality of intermediate gear trains. The degree of freedom in design is improved.

As shown in FIG. 3, the paper feed gear 28 is connected to the claw 27 formed integrally with the central shaft of the paper feed roller 64 via a clutch (not shown). The claw 27 is provided with an upright surface in the rotation direction around the cylinder in the ratchet gear shape, and teeth are engraved so as to have a smooth surface in the anti-rotation direction from the apex of the upright surface. A biased claw plate 66 is arranged, and the claw plate 66 is configured to be disengageable from the teeth of the claw 27 by the relay 22.
The clockwise rotation of 8 causes the paper feed roller 64 to rotate clockwise due to a slight frictional force of the clutch, thereby causing the claw plate 66 to rotate.
Although the paper feed roller 64 stops when the claw 27 stops due to, the paper feed roller 64 can rotate against the frictional force, and when the recording paper is pulled by a jam or the like, the paper feed roller 64 moves in the conveying direction and resists the frictional force. Can rotate.

The registration gear 26 is connected to the claw 20 integrally formed with the central axis of the registration roller 23 via a clutch (not shown). The claw 20 is provided with an upright surface around the cylinder in the direction of rotation in a ratchet gear shape. Teeth are machined so as to have a smooth surface in the counter-rotation direction from the apex of the upright surface. A biased claw plate 65 is disposed, and the claw plate 65 is configured to be engageable with and disengageable from the teeth of the claw 20 by the relay 21.
When the claw 20 stops by the claw plate 65, the registration rollers 23 rotate clockwise and the registration rollers 18 rotate counterclockwise due to the slight frictional force of the clutch. Although 23 is stopped, it can rotate against the frictional force, and when the recording paper is pulled by a jam or the like, the registration rollers 18 and 23 can rotate in the conveying 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 edge of the recording sheet comes into contact with the registration rollers 18 and 23 to form an appropriate bend and the leading edge of the recording sheet is aligned at right angles to the transport direction, the relay 22 (FIG. 3B) is activated. When turned off, the claw plate 66 is in the second position.
The ratchet teeth of the cloak 27 are entered and the rotation of the second crow 27 is stopped.

On the other hand, the leading edge of the recording paper is the registration roller 1.
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 by contacting the contact surfaces 8 and 23, and the claw plate 65 moves to the first position. The rotation of the first crow 20 is stopped by entering the ratchet teeth of the first crow 20.

Returning to FIG. 1, the frame body composed of the side walls 30 and 31 is covered with an outer panel 8 on the outside, 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 capable of opening outward is disposed, and between the side door 12 and the outer panel 8, a conveyance roller is provided. A tray 6 for accumulating the recording sheets transferred by 55 is formed.

On the outside of the conveying path 50, a side frame 11 having a cassette storage 7 is detachably attached from the outside, and an opening and closing is provided 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 such that it can be opened and closed by hinge portions (not shown) provided on the side walls 30 and 31.

Next, the transfer operation of the recording paper will be described. Figure 2
At, the rotational force from the pinion 17a is
The recording paper is transmitted from the paper feed roller 64 (FIG. 3) to the registration rollers (18, 23) by the paper feed roller 64. In synchronization with the conveyance of the recording paper, the relay 21 sucks the claw plate 65, the tip of the claw plate 65 enters the teeth of the crow 20 and the rotation of the crow 20 is stopped, so the registration rollers (18, 23). Has stopped.

In this state, the registration gear 26 continues to rotate, but the registration rollers are stopped. Therefore, the clutch interposed between the registration gear 26 and the crow 20 applies a slight rotational force to the crow 20. Then, it continues to rotate together with the resist gear 26 against the frictional force. When the recording paper is detected by the registration sensor 45 and a predetermined time elapses, the electromagnetic clutch between the paper feed roller 64 and the paper feed gear 28 is disengaged, and the conveyance of the recording paper is stopped.

On the other hand, the driving force from the power transmission gear 36 drives the photosensitive drum 9 of the cartridge 2 and the mechanism inside the developing device 10, and the image signal light from the optical unit 5 (FIG. 1) is transferred to the photosensitive drum 9. When the image formed on the surface of the sheet is developed and the suction of the relay 21 is released at a predetermined timing, the registration roller immediately transfers the recording paper to the photosensitive drum 9 and the transfer roller 47 (FIG. 1) by the driving force urged by the clutch. The image on the photosensitive drum is transferred to a recording sheet, and thereafter, the image is transferred to a conveyance roller 55 via a fixing device (not shown).
(FIG. 1), the tray 6 is loaded.

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

A mounting plate 77 is detachably mounted on the drive control unit 14 by means of screw holes 77b to 77e. The motor control board 16 is fixed to the mounting plate 77, and the control board 16 has a plurality of connectors. 87-90 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 pulled upward in the vertical direction of the paper in FIG. 3 (b). When the drive control unit 14 is pulled up, since the power is off, the claw plate 65 of the relay 21 is pulled by the spring SP and is not engaged with the ratchet 20, but the relay 22 does not have the spring SP. Is engaged with the ratchet 27.

When the drive control unit 14 is pulled up 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 arranged on the apparatus main body side of the drive control unit 14 moves. , Registration gear 26
Since the bottom of the feeding gear 28 has a smaller diameter than the bottoms 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 has an opening 16c (FIG. 6) through which the stator mounting portion of the drive motor 17 can penetrate from the back surface side to the front surface side. The stator mounting part is fixed,
A mounting plate 77 is fixed to the stator mounting portion on the rear surface 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 attached to and detached from the drive control unit 14 with the drive control unit 14 attached to the apparatus body. You can

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

The upright portion 49e of the main plate 49 is positioned near the connectors 89 and 88 and supports the motor control board 16 attached to the main plate 49, and the upright portion 77a of the attaching plate 77 includes the connectors 87 and 88. Located near 90,
The motor control board 16 is supported.

The bent upright portion (support portion) 77a of the mounting plate 77 is provided on the back surface (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 up to the supporting body (standing portion) 49e of the main plate 49. The control circuit board 16 may be supported by the support portion of the mounting plate 77 instead of the support body 49e, and another standing portion is raised from the main plate 49 instead of the standing portion (support portion) 77a. Alternatively, it may directly extend from the side wall 31 of the apparatus main body to which the main plate 49 is attached.

In this way, since the control circuit board 16 is supported from the back side by the support body, the support portion, etc.,
The connector can be pulled out by pressing 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 the other party such as an electric member, which is economical. In addition, it is possible to slightly bend the wiring of the mating connector part to separate the connector part from the control circuit board, and the control circuit board can be removed without being disturbed by the connector part. It is possible.

As described above, when the control circuit board 16 is provided with the connector, the control circuit board is connected to another control circuit board,
And / or it can be used as a relay substrate with an electric 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 peripheral edge portion.
It is surrounded by a pattern P1 connected to the positive electrode of the power source and a ground electrode pattern P2. In addition, P1 and P
The non-contact portions between the two are connected by a jumper wire (not shown).

A motor 17 is provided in the central portion on the left-hand side of the board 16.
The opening 16c in which the status is located is opened, and the patterns P4, P5, P6 and P7 are connected to the coils of the status.
And Hall element 86 for controlling the rotation speed of the motor 17
Patterns for connecting 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,
Further, a connector 87 having seven connection terminals is arranged near the left edge of the board 16.

Further, the electric circuit for controlling the image control apparatus 1 receives the signal from the motor control board 16, the operation section 54 and the signal from the recording paper feed state detecting means 84 as shown in the block diagram of FIG. A main control circuit 83 which receives and sends a control signal to the motor control board 16 via the connector 87;
It is configured with a power supply unit 80 that supplies electric power to these. The main control circuit 83 is arranged in the lower part of the main body of the apparatus and is connected to the operation unit 54 by an external switch 91.
The power supply unit 80 including the AC / DC converter is arranged in the apparatus main body on the side opposite to the motor control board 16.

Then, as shown in FIGS. 6 and 7, the solenoids (21, 22) and the cooling fan 43 are turned on.
1 and 82 are provided separately, and one terminal (89a, 90a) of the solenoid can be connected to one terminal 81a of the common power source applied to the drive motor 17 via the switch 94. . The connection between the other terminal (89b.90b) of the solenoid and the other terminal (earth end) of the common power source is controlled by the switches 95 and 96 in accordance with the transport state of the recording paper. There is.

Therefore, the solenoid 21 or 2
When 2 is turned off, a counter electromotive force is generated at the turned off terminal, but since the fan 43 uses a power source different from that of Solade, it is not possible to use the same pattern as the solenoid on the control circuit board. Moreover, since the counter 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 so that cooling is not hindered.

As described above in detail, in the present embodiment, the electric control circuit is dispersed in a plurality of control circuit boards and arranged in the main body of the apparatus, and the drive motor is provided to the main body of the apparatus together with the control circuit board. Since it is configured to be removable, the drive motor and the control circuit board can be installed and removed as an integrated unit. If the 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 board is replaced, it is not necessary to adjust the drive motor, and the unit body can be replaced as needed during maintenance / inspection or assembly, and the replacement process can be performed easily.

[0061]

As described above, according to the first aspect of the invention, the electric control circuit is dispersed in a plurality of control circuit boards and arranged in the apparatus body, and the drive motor is installed in the apparatus body together with the control circuit board. The drive motor and the control circuit board can be attached and detached as an integrated unit because it is configured to be removable, 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. Instead, the unit body can be replaced as needed at the time of maintenance and inspection or at the time of assembly, and the replacement process can be easily performed.

Further, a mounting plate is provided on the other surface side of the control circuit board, the stator mounting portion of the drive motor is fixed to the control circuit board together with the mounting plate, and the mounting plate can be attached to and detached from the apparatus main body. The motor and the motor control board can be attached and detached as an integral unit by replacing the mounting plate, and if the unit is prepared in advance by adjusting the speed integrally with the drive motor, only the drive motor Alternatively, unlike the case of replacing only the control circuit board, it is not necessary to adjust the drive motor, and the unit can be replaced as needed during maintenance inspection or assembly, and the replacement process is simple. be able to.

According to the first aspect of the invention, the motor control circuit board has a connector for connecting to another control circuit board and / or an electric member. When the control circuit board is provided with a connector, the control circuit board is
It can be used as another control circuit board and / or a relay board with an electric member. Therefore, the assembly work can be simplified and the cost can be reduced without using a long harness.

Further, according to the invention described in claim 1,
With the control circuit board attached to the main body of the device,
Touch the other side of the control circuit board to the other side and
Since the upright support part that supports by the attached plate is provided,
The support section allows the control circuit board to be supported from the back side, and the connector surface can be pulled out by pressing the surface of the support section with a tool or hand, allowing the connector to be detached from the motor control circuit board. It can be done easily. Note that the other side of the motor control circuit board is
A support that directly or indirectly supports the mounting body
Even so, from the motor control circuit board of the connector as well
It is possible to easily perform the detachment operation.

The invention described in claim 1 is the connection
The motor near the outer edge of the motor control circuit board and near the support.
Since so as to place beside the other control circuit group Ita及 beauty /
Or together with a can be economically possible to shorten the harness from the counterpart electric member or the like and bent slightly wiring phase hand side connector portion can be kept apart from the connector portion from the control circuit board The motor control circuit board can be removed without being disturbed by the connector portion. In addition, other than the motor control circuit board
Support that supports the direction directly or indirectly with the device body
To position the connector near the support.
Even if you do, remove the motor control circuit board in the same way.
Can be performed without being disturbed by the connector part.
Noh.

According to the second aspect of the present invention, the solenoid for controlling the driving and stopping of the transport roller for transporting the recording paper by engaging and disengaging the locking member with the rotating body and the inside of the apparatus body are cooled. Power sources for the cooling fans are separately provided, and one terminal of the solenoid is configured to be connectable to one terminal of a common power source applied to a drive motor that drives a drive mechanism of the apparatus body, and the other terminal of the solenoid is connected. And the other terminal of the common power supply,
Since it is configured to control according to the conveyance state of the recording paper,
When the solenoid is turned off, a counter electromotive force is generated at the turned off terminal, but the fan does not use the same pattern as the solenoid and the back electromotive force is not applied to the cooling fan. There is no change in the value of the current flowing through the cooling fan, and the cooling fan does not rotate irregularly and cooling is not hindered.

[Brief description of 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 the front view.

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

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 configuration diagram of an electric circuit.

[Explanation of symbols]

1 Image forming device 2 cartridges 14 Drive control unit 16 Motor control board 17 Motor (drive motor) 36 Drive power supply gear 65, 66 Claw plate (locking means)

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G03G 15/00 550 G03G 21/16-21/18

Claims (3)

(57) [Claims] 1. In an image forming apparatus in which an electric control circuit is dispersed in a plurality of control circuit boards and arranged in an apparatus body, a driving force supply gear for driving a drive mechanism of the apparatus body is provided on the apparatus body side, and A drive motor that supplies a drive force to the drive force supply gear is arranged on a motor control circuit board to form one of the plurality of control circuit boards, and a rotor portion of the drive motor is connected to the motor control circuit board. The rotation shaft of the drive motor is provided on one surface side and penetrates the motor control circuit board to communicate with the driving force supply gear on the other surface side so as to be able to transmit the rotation drive force. A mounting plate that is attachable to and detachable from the apparatus main body is provided on the other surface side of the motor, and the stator mounting portion of the drive motor is fixed to the motor control circuit board together with the mounting plate. The drive motor is configured to be attachable to and detachable from the apparatus main body together with a circuit board, and the motor control circuit board is provided with a connector for connecting to another control circuit board and / or an electric member. In a state where the motor control circuit board is mounted on the apparatus main body side, a standing support portion is provided to support the other surface of the motor control circuit board by contacting the other surface with the mounting plate, and the connector near the outer edge of the motor control circuit board. An image forming apparatus, wherein the image forming apparatus is arranged in the vicinity of the supporting portion. 2. A support body for directly or indirectly supporting the other surface of the motor control circuit board with the main body of the apparatus is provided, and the connector is arranged in the vicinity of the support body. 1. The image forming apparatus according to 1. The drive and stop of conveying rollers for conveying the 3. Symbol recording paper, comprising a solenoid retaining member is controlled by disengaging the rotating body, and a cooling fan for cooling the inside of the apparatus main body, said solenoid And a power source for the cooling fan are separately provided, one terminal of the solenoid is configured to be connectable to one terminal of a common power source applied to the drive motor, and the other terminal of the solenoid is common to the other terminal. The image forming apparatus according to claim 1 , wherein the connection to the other terminal of the power source is controlled according to the conveyance state of the recording paper.