JPS5821051A - Driving transmission device of unit - Google Patents

Abstract

PURPOSE:To prevent vibration of a motion transmitting unit, by arranging a fixing means of the motion transmitting unit in one place and aligning the direction of driving transmission to the unit with the direction of thrust of a rotary member. CONSTITUTION:If a unit is depressed, a hooked lever 8 is turned clockwise about the center of a pin 11. In this way, a connecting arm 26, actuator lever 31 and the second clutch member 17 are moved. If a fixing hook 13 is stopped to a fixed pin 14, the connecting arm 26, actuator lever 31 and the second clutch member 17 are reset to the original position again by action of a tension spring 32 and compression spring 23. Accordingly, the second clutch member 17 is engaged to the first clutch member 16 to connect a clutch 15. Engagement of the clutch 15 is surely performed in a sliding manner, and a transmission system is never caused vibration.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a unit that includes a rotating body and is removable from a recording device main body in the radial direction of the rotating body, and a unit that is detachable from a recording device main body when the unit is installed in the recording device main body. It has a fixing means for fixing the position, and a pull-out lever connected to the fixing means and capable of releasing the unit from fixing the position, and transmits the drive of the recording apparatus main body to the unit when the unit is attached to the recording apparatus main body. , relating to a drive transmission device for a unit configured to drive the rotary body. The drive transmission device of the above type is well known, and includes, for example, a fixing unit having a rotary body configured as a fixing roller, or a developing sleeve configured as a developing sleeve. It is attached to a developing unit etc. that has a rotating body inside.

In this type of conventional drive transmission device, a spur gear is fixed to a drive shaft on the main body side of a recording device such as a copying machine, and a spur gear that can mesh with the spur gear is provided on the unit side.

When the unit is attached to the recording apparatus main body, the above-mentioned spur gears mesh. Also, at the position where the spur gears mesh, that is, the position where the unit is attached to the recording apparatus main body,
The position of the unit and the main body is fixed only by means of fixing means, such as a fixing wheel that engages with a pin. In this way, a drive transmission device that transmits drive to the unit using a spur gear is a flat gear. When the gears rotate, an action is applied to increase the distance between the center points of the gears.

This action causes vibrations in the unit and/or the main body (furthermore, since the unit is fixed at one point as mentioned above), such vibrations are relatively severe; has various adverse effects on precision instruments. For example, if the unit is a fusing unit for a copying machine, this causes deterioration in image quality0. Note that if the unit is fixed in multiple ways, the vibrations will be slightly weakened, but when the unit is attached or removed, the This requires a mechanism that can be released, resulting in problems such as increased cost and increased size of the device. Moreover, even if the vibrations were slightly weakened, the above-mentioned deterioration in image quality could not be resolved.

SUMMARY OF THE INVENTION An object of the present invention is to provide a drive transmission device for a unit that eliminates all of the above-mentioned conventional problems and causes less vibration even if the unit is fixed at one point.

Embodiments in which the present invention is applied as a drive transmission device for a fixing unit of a copying machine will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 is a fixing unit, 2 and 3 are rotating bodies configured as fixing rollers, and fixing roller 2 is a rotating body configured as a fixing roller.
, 3 is a fixing unit installed internally in 1. This fixing unit is removably attached to the copying machine body (not shown) in the radial direction of fixing rollers 2 and 3, in the direction of arrow A in this example. The unit 1 has a pull-out lever 4 for pulling it out from the copying machine main body, and a fixing means 5 for fixing the unit when it is attached to the copying machine main body.The draw-out lever 4 has a handle portion at one end. 4a is formed, and the other end thereof extends upward and is swingably attached to the side plate of the unit 1 via a pin 6. Further, the fixing means 5 includes an intermediate lever 7, a pawl lever 8, and a torsion spring 9, and one end of the torsion spring 9 is anchored to the intermediate lever 7 and the pawl lever 8, respectively. The intermediate lever 7 has one end fixed to the drawer lever 4 and a curved recess 10 formed at the other end. The pawl lever 8 is rotatably attached to the unit 1 through a pin 11 at its center, and has a pin 4 loosely fitted in the recess 10 of the intermediate lever 7 at one end, and a pin 4 at the other end. Fixing claws 13 that can be engaged with fixing pins 14 provided on the copying machine main body side are provided respectively.

The pull-out lever 4 and the fixing means 5 are constructed as described above. In this case, the torsion spring 9 biases the claw lever 8 counterclockwise around the pin 11, and the tip of the fixing claw 13 is tapered. 0 formed in Therefore,
When installing the unit 1, simply move the unit l to the right in FIG. The unit 1 is rotated clockwise around the center, the fixing claw 13 is locked with the fixing pin 14, and the unit 1 is mounted in a fixed position on the main body of the copying machine. Also, when pulling out the unit,
Pull - □ By pulling the handle 4a of the pull-out lever 4 to the left in the mirror 1 figure, the pull-out lever 4 moves around the pin 6, and along with this movement, the intermediate lever 7 also moves to the left.0 Intermediate lever Due to the movement of 7, the pin 12 of the claw lever (=8) is lifted upward by the recess 10, and the claw lever 8 is rotated clockwise around pin 11 as shown by the chain line, and the fixed claw 13 is fixed. It escapes from the pin 14, and the unit 1 is pulled out from the copying machine main body.

The pull-out lever 4 and the fixing means 5 configured in this manner are known per se, but the drive transmission device according to the present invention has a clutch that is connected and disconnected by unit fixing and releasing operations of the pull-out lever 4 and the fixing means 5. I have 15 wo.

1 and 2, the clutch 15 includes a first clutch member 16 fixed to a drive shaft 18 on the copying machine main body side,
The first and second clutch members 16 are comprised of a second clutch member 17 rotatably mounted on a shaft 19 attached to the side plate 1a of the fixing unit 1 and slidably movable in the axial direction. Reference numeral 17 is constructed as a pawl clutch, and the grid line portion shown in FIG. 0) is formed
Further, a drive gear 20 is fixedly or integrally formed with the second clutch member 17 , and this gear 20 meshes with a gear 21 fixed to the shaft of the fixing roller 2 . The drive shaft 18 is drivingly connected to a drive device (not shown) provided in the main body of the copying machine, and in this example, a sprocket 22 is fixed to the drive shaft 18, and a sprocket 22 is connected to the A chain (not shown) is moved in a predetermined direction by a drive device. Furthermore, in this example, the fixing roller 3 is in contact with the fixing roller 2, so that the fixing roller 22 is in contact with the fixing roller 2.
When the fixing roller 3 is driven, the fixing roller 3 is provided in a position configured to follow the driving, and the clutch 15 is connected to the second clutch member 17.
In this case, the compression spring 23 is connected between the drive gear 20 and the side plate 1a. It is fitted onto the shaft 19 and urges the second clutch member 17 to move in the direction of arrow B.

Thus, the second clutch member 17 is moved by the compression spring 23 to the first clutch member 17 when the fixing unit (1) is mounted on the opposite side of the copying machine.
The clutch member 16 is engaged and the clutch 15 is connected, but if the clutch remains connected, the fixing unit 1
cannot be attached or detached. Therefore, the drive transmission device is provided with a clutch connecting/disconnecting means 24 which is interlocked with the fixing and releasing operations of unit (1) when unit (1) is attached and detached.

The clutch connection/disconnection means 24 in this example includes a connecting arm 26 pivotally attached to one end of the pawl lever 8 on the fixed pawl 13 side via a pin 25, and an inclined cam 2 attached to the other end of the arm.
7, and an operating lever which is provided with a cam follower 28 of an inclined cam 27 at one end and a roller 29 for clutch disengagement at the other end (see Fig. 3), and which is rotatably attached to the unit side plate 1a via a pin 30. 31, and a cam 7 on the operating lever 31.
The roller 28 has a tension spring 32 that provides a rotational behavior in the direction in which the roller 28 comes into contact with the inclined cam 27. The connecting arm 26 is supported almost vertically by the pin 25 and the inclined cam 27 coming into contact with the cam 7 orob 28, and an elongated hole 33 extending in the extending direction of the arm is formed approximately in the center thereof. A pin 34 attached to the unit side plate 1a is fitted into this elongated hole 33. The inclined cam 27 has a lower surface formed as an inclined surface, and the lower surface of the cam 7 and the inclined cam 2
It is inclined along the inclined plane of 7.

The clutch connection/disconnection means 24 configured in this manner connects/disconnects the clutch 15 by rotating the pawl lever 8. First, the unit 1 is installed and the operation of disconnecting the connected clutch 15 is performed. explain.

When the fixing unit) 1 is attached to the main body of the copying machine, the fixing claw 13 is locked to the fixing pin 14.

When pulling out the unit 1, the pull-out lever 4 is pulled to the left as described above, thereby causing the pawl lever 8 to rotate clockwise in FIG. 1 with the pin 30 as the center.

Due to this rotation, the fixing claw 13 is lowered and detached from the fixing pin 14, and the connecting arm 26 also moves from the long hole 33 to the pin 34.
Move downward while being guided by. As the connecting arm 26 moves, the inclined cam 27 comes into pressure contact with the cam follower 28, and the operating lever 31 rotates clockwise about the pin 30 in FIG.

Then, the disengagement rollers 29 press the drive gear 20 in the opposite direction of the arrow B, and the drive gear 20 and the second clutch member 17 provided integrally with the drive gear 20 resist the compression spring 23 in the direction of the arrow B. Moving in the opposite direction, the second clutch member 17 is separated from the first clutch member 16.

Thus, the clutch 15 is disconnected in conjunction with the pulling out operation of the fixing unit 1. Note that after pulling out the unit l, if you release the pull-out lever 4, the torsion spring 9
Due to this action, the pawl lever 8 returns from the position shown by the chain line to the position shown by the solid line, and the connecting arm 26, the operating lever 31, and the second clutch member 17 also return to their original positions. The second clutch member 17 is pressed in the direction of arrow B by the compression spring 23, and the shaft 19 has a support stopper.
19a is provided, and the second clutch member 17 is held at an appropriate position.

Next, when the pulled-out fixing unit 1 is to be attached to the main body of the copying machine, the unit 1 can be fixed in position and the clutch 15 can be connected by simply pushing the fixing unit 1 all the way in. That is, when the unit 1 is pushed in, the pawl lever 8 rotates clockwise about the pin 11 as shown by the chain line as described above. Due to this rotation, in exactly the same way as the above-mentioned operation when pulling out,
The connecting arm 26, the actuating lever 31, and the second clutch member 17 move. When the fixed claw 13 is locked to the fixed pin 14, the connecting arm 26, the actuating rake 31 and the second clutch member 17 are connected to the tension spring 32 and the compression spring 2.
3 returns to its original position again, and the second clutch member 17 engages with the first clutch member 16, causing the clutch 1
5 is connected. At this time, since the first and second clutch members 16 and 17 are tapered at the claw portions, they can be connected securely in a sliding manner. Even with a unit that can be attached and detached in both directions, the drive transmission that drives the rotating body is in the thrust direction of the rotating body, making it possible to significantly reduce vibrations of the unit and recording device.

Moreover, the clutch can be automatically connected and disconnected by the unit's attachment/detachment operation, which is advantageous. Furthermore, if used in the fixing unit of a copying machine as in the above embodiment, deterioration of image quality can be prevented.

It should be noted that the drive transmission device according to the present invention is not limited to the fixing unit of a copying machine, but can of course be applied to various units such as a copying machine and an electrostatic recording device as long as it is a unit that can be attached and detached in the radial direction of a single rotating body. is 0

[Brief explanation of the drawing]

1, 2, and 3 show an embodiment of the drive transmission device according to the present invention, and FIG. 1 shows the I-I diagram in FIG.
FIG. 2 is a side view, and FIG. 3 is a plan view of a portion of the actuating lever. 4... Pull-out lever 5... Fixing means 15...
Clutch 16...first clutch member 17...
Second clutch member 24...Clutch connection/disconnection means

Claims (1)

[Claims] a unit that includes a rotating body and is removable from the recording device main body in the radial direction of the rotating body; a fixing means that fixes the unit in position when the unit is installed in the recording device main body;
a pull-out lever connected to the fixing means and capable of releasing the fixed position of the unit, and transmitting the drive of the recording device main body to the unit when the unit is attached to the recording device main body;
The drive transmission device for the unit configured to drive the rotating body includes a first clutch member fixed to the drive shaft of the recording device main body q, and a second clutch member provided on the unit and drivingly connected to the rotating body. , when the unit is attached to the recording device main body, the latch and the second
an elastic member that urges the clutch member in a clutch connection direction to engage the first clutch member; and a clutch connection/disconnection stage that connects and disconnects the clutch in conjunction with the unit fixing release operation by the pull-out lever; Drive transmission device 0 for a unit, characterized in that the direction of drive transmission from the device main body to the unit is the thrust direction of the rotating body.