JPH02132036A - Sheet conveying device - Google Patents

Abstract

PURPOSE:To improve the operability in jam processing by releasing the coupling between the second conveying guide plate and a driven roller pressing means and removing the pressure to the driven roller with an action to open the first conveying guide plate. CONSTITUTION:When the first conveying guide plate 11 is at the open position, the coupling between its lock section 11e and a lock pin 12h is released, the second conveying guide plate 12 is lowered, and the pressure between a driving roller 13 and a driven roller 12e is removed. When this coupling is released, the second conveying guide plate 12 is applied with a force by the driving roller 13, the driven roller 12e, and a compression spring 12d fitted to it, and its position is set. When the driving roller 13 and the driven roller 12e are opened and the pressure between them is removed, a jammed sheet in a conveyance path 2 can be removed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention includes a first conveyance guide plate that can be opened and closed and that constitutes a first conveyance path for conveying sheets, and a second conveyance guide plate that is continuous with the first conveyance path. an openable and closable second conveyance guide plate that forms a path and is equipped with a driven roller that is pressed against a stationary drive roller;
The present invention relates to a sheet conveying device for an image forming apparatus such as a copying machine, having the following.

-1 In the sheet conveyance path of a copying machine, etc., when conveying the sheet with the driving roller and the driven roller in pressure contact, the pressure on the driven roller is released in order to clear the sheet jam. There is a need. Then, a continuous first conveyance path and a second conveyance path are provided.
In a conveyance device having a conveyance path, when a driven roller is provided on the conveyance guide plate constituting the second conveyance path,
Conventionally, simply opening the first conveyance path did not release the pressure on the driven roller, and it was necessary to provide a mechanism for releasing the pressure on the second conveyance guide plate.

However, in such a device, it is necessary to open the first conveyance path and also operate the pressure release mechanism of the second conveyance guide plate, and it is not possible to clear a jam or the like with a simple operation.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems in the prior art and to provide a sheet conveying device with improved operability in jam handling and the like.

■ In the present invention, the first guide plate includes an engaging portion, a pressing means for pressing the driven roller against the driving roller, and a pressing means that engages with the engaging portion when the first guide plate is in the closed position. By providing an engaging member for setting the pressure position and a means for holding the second guide plate in position when the pressure is released, the driven roller can be pressurized or released by simply opening and closing the L-th guide plate. Can be done.

Figure 1 shows an embodiment in which the present invention is applied to a duplex conveying device of a copying machine. A transfer paper P, which is an example of a sheet carrying an unfixed toner image formed by a predetermined copying process, is transferred to the fixing section 10.
After being fixed at 0, the sheet is introduced into a conveying section, which is an example of a sheet conveying device.

The transfer paper P enters the second conveyance path 2, passes through the first conveyance path 1, and when single-sided recording is performed, passes through the conveyance path 3 and is then discharged to complete the copy. When double-sided recording is to be performed, the driving means (not shown) of the branch claw 4 is turned on, the branch claw 4 rotates clockwise, a conveyance path 5 is opened, and the transfer paper P passes through this and is transferred to a double-sided tray 7 by a paper discharge roller 6. It is released and stored in it. The leading edges of the transfer sheets P stored in the double-sided tray 7 are aligned by an end fence 8 that is movable for each size. Air A is blown onto the tip of the stored transfer paper P to make it float, thereby reducing the coefficient of friction between the sheets and improving the separation performance. As a result, the transfer papers P are sequentially re-fed starting from the lowest one, with their lower surfaces being attracted by the negative pressure section 9 to the upper surface of the belt 10 driven at a predetermined timing.

If the transfer paper P is jammed, it is necessary to remove it.

FIG. 2 shows a state in which the first upper transport unit 20 is opened.

When the transfer paper P is jammed, by opening the first upper conveyance unit 20 around the fulcrum 20a,
The driven roller 20b is released together with the first upper conveyance unit 20, and the jammed transfer paper P becomes free and can be removed.

If a jam occurs in the duplex tray 6 during duplex stacking or if a jam occurs during paper refeeding, it is necessary to remove the transfer paper P from the duplex tray 6.

At this time, the second conveyance section upper unit 30 is opened around the rotation shaft 30a to remove the jammed transfer paper P. Figure 3 is an enlarged view of the first and second conveyance paths.
and the second conveyance guide plate are both shown in the closed position.

After opening the upper conveyance unit 20, the first conveyance guide plate 11 constituting the first conveyance path 1 is rotated counterclockwise about the rotation center 11a as shown in FIG. Open the seat outlet section of the

A force is applied to the first conveyance guide plate 11 by a slide shaft 11c rotatably attached to the rotation center 1lb and a compression spring lid attached to the slide shaft 11c. As shown in FIG. 4, when the first conveyance guide plate 11 is opened, the force of the compression spring lid acts in the opening direction, and the moment due to the force of the spring 11d and the first conveyance Guide plate 1
The moment due to the self-weight of 1 is balanced, and the 1st
The open position of the guide plate 11 is determined.

Further, the first conveyance guide plate 11 has a locking portion 1 which is an engaging portion.
1e is provided.

As shown in FIG. 6, the slide shaft 11c is designed so that it can freely rotate and move in the axial direction by moving the position of the upper support point 1lb due to the rotation of the first conveyance guide plate 11.
It is held in position below by a member 11f rotatably supported on the transport device main body side Fi101. The second conveyance guide puller 12 is rotatable around a rotation center 12a, and the rotation center 12a is an example of position holding means.
Slide shaft 1 rotatably mounted around 2b
2c and a compression spring 12d attached thereto. Slide axis]. 2 c is slide axis 1
Similar to 1c, it is held in position by a member 12f shown in FIG.

The driven roller 12e of the second conveyance guide plate 12 is pressed against the drive roller 13 by a pressure member 12g, which is an example of pressure means. As shown in FIG. 7, a lock pin 12h, which is an engaging member, is attached to the bracket portion 12g-1 of the pressure member 12g, and this lock pin 12h engages with the lock portion lie when the first conveyance guide plate 12 is in the closed position. The driven roller 12e is pressed by the pressure member 12g, and the driving roller 1
Appropriate pressure is generated between 3 and 3. In addition, lock pin 1
2h is fixed to the bracket portion 12g-1 by caulking as shown in FIG. 7, and a roller 12h-1 is fitted therein so that engagement and disengagement can be smoothly performed.

FIG. 4 shows the first conveyance guide plate 11 in an open state.

When the first conveyance guide plate 11 is in the open position, the engagement between the lock portion lie and the lock pin 12h is released, the second conveyance guide plate 12 is lowered, and the pressure between the drive roller 13 and the driven roller 12e is reduced. The pressure is removed. When the second conveyance guide plate 12 is disengaged, the drive roller 13
The slide shaft L2c and the compression spring 12 attached thereto are arranged so that the pressure between the slide shaft L2c and the driven roller 12e is removed.
The position is set by receiving force from d.

If the space between the driving and driven rollers is opened and the pressure is removed in this way, the sheet jammed in the conveyance path 2 can be removed.
That is, by simply opening the first conveyance guide plate 1l, the pressure between both rollers is removed without the need to provide a special pressure removal mechanism and operate it, and the jam can be cleared with a simple operation.

FIG. 5 shows that after the first conveyance guide plate 11 is in the open position, the second
Bracket portion 12g-1 of the pressure member of the conveyance guide plate 12
The figure shows a case where the second conveyance guide plate 12 is further pushed down by holding the second conveyance guide plate 12. In this embodiment, the position holding means of the second Wi feed guide plate 12 when the roller is not pressed is the slide shaft 12c.
Since it has an elastic structure having a compression spring 12d and a compression spring 12d, the second conveyance guide plate 12 can be lowered and the second conveyance path can be widened as shown in the figure by simply applying pressure to the compression spring 12d. As a result, even if a sheet remains inside, it can be easily taken out.

Note that when the bracket part 12g-1 is released from the state shown in FIG. 5, the state shown in FIG. 4 is automatically returned to the state shown in FIG. 4 due to the action of the compression spring 12d.

Then, when the first conveyance guide plate 11 is placed in the closed position, it becomes the state shown in FIG.
ie is engaged with the lock pin 12h of the second conveyance guide plate, and the position is determined. As described above, according to the present invention, by simply opening the first conveyance guide plate, the engagement of the driven roller pressing means of the second conveyance guide plate is released, and the pressure on the driven roller is released. This improves the operability in jam handling.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a sheet conveying device used in a copying machine showing an embodiment of the present invention, FIG. 2 is a view showing the state in which the first conveying unit is opened, and FIG. 2Wi
An enlarged view of the feeding path part, Figures 4 and 5 are views showing the first conveyance guide plate in an open state, Figure 6 is a sectional view showing the slide shaft holding part, and Figure 7 is a view of the lock pin. FIG. 1...First conveyance path 2...Second conveyance path 11...First conveyance guide plate lie...Lock part (engaging part) 12...Second conveyance guide plate 12c...Slide Shaft (position holding means) 12d...
Compression spring (position holding means) 12e... Driven roller 12g... Pressure member (pressure means) 12h... Lock pin (engaging member) 13... Drive roller Fig.

Claims (1)

[Claims] An openable and closable first conveying path constituting a first conveying path for conveying a sheet.
A sheet conveyance device comprising a conveyance guide plate and an openable and closable second conveyance guide plate that forms a second conveyance path continuous with the first conveyance path and is equipped with a driven roller that is pressed against a stationary drive roller. an engaging portion on the first conveyance guide plate; a pressing means that presses the driven roller against the driving roller; and a pressurizing means that engages with the engaging portion when the first conveyance guide plate is in a closed position and presses the driven roller. A sheet conveyance device comprising: an engagement member for setting the means to a pressurizing position; and means for holding the second conveyance guide plate in a predetermined position when the engagement is released.