JPS60223746A - Original-copy transporting apparatus - Google Patents

Abstract

PURPOSE:To prevent the clogging and breakage of an original copy when said original copy is pulled-out, by revolving a driving roller reversely by the output of a pulling-out detecting means for detecting the pulling-out of the original copy in the reverse direction to the feeding direction. CONSTITUTION:When an operator detects the skew of an original copy and the original copy PP is pulled in the direction of arrow A1, in the state where the original copy stops at a reading preparation position, a driving roller 2 reversely revolves clockwise, and a sensor 9 is turned ON, and then a controller 15 sets a reversal signal into a direction control signal DD, and starts-up an operation permission signal ED. Therefore, the driving rollers 2 and 3 are driven clockwise, and the original copy PP is transported in the direction of arrow A2. This state lasts until the rear edge of the original copy PP passes through a sensor 7, and when the sensor 7 is turned ON, the controller 15 stops a stepping motor 1. When the original copy PP which is in the stop state at the reading preparation position and interposed between the driving and a trailing rollers is to be pulled- out, the original copy PP is automatically discharged towards the operator.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a document conveyance device for conveying a transmission document in a facsimile machine.

[Prior art] Generally, in the document feeder of a facsimile machine.

An IM document is sandwiched between a drive roller driven by a motor and a driven roller in contact with the drive roller, and the document is supported and conveyed by its frictional force.

Conventionally, when an operator attempts to pull out a skewed document or sends the wrong document, the operator applies force to the document in addition to the frictional force between the driving roller and the driven roller. However, this has caused inconveniences such as the manuscript being twisted or torn.

[Purpose] The present invention has been made to solve the above-mentioned drawbacks of the prior art, and provides a document that can prevent the document from being torn by reversing the drive roller to eject the document when it detects that the document is being pulled out. The purpose is to provide a conveyance device.

[Configuration] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the invention.

In the figure, 1 is a stepping motor, 2 and 3 are drive rollers, 4 is a timing belt that transmits the driving force of the stepping motor 1 to the drive rollers 2 and 3, and 5 and 6
are driven rollers that are in pressure contact with the drive rollers 2 and 3, respectively; and 7 is a sensor that includes a pair of light emitting element and light receiving element, and detects that the document PP is inserted into the nip formed by the drive roller 2 and the driven roller 5. , 8 is a sensor consisting of a pair of light-emitting element and light-receiving element, which detects that the document PP is located immediately in front of the reading position RP.

A one-way clutch 10 is fitted to the shaft 2a of the drive roller 2, which engages and operates when the shaft 2a rotates clockwise, but does not engage when the shaft 2a rotates counterclockwise. A plate-shaped actuator 12 is attached to the clutch 10 via a boss portion 11 .

The actuator 12 extends vertically due to its own weight when the one-way clutch 10 is not operating, and thereby,
As shown in FIG. 2, the optical axis of the sensor 9 consisting of a pair of light emitting element and light receiving element is blocked by the actuator 12.

Furthermore, if the operator tries to pull out the document PP while it is being sandwiched between the drive roller 2 and the driven roller 5, the document PP will be pulled in the direction of the force indicated by the arrow AI, so the drive roller 2 will rotate counterclockwise. As a result, the one-way clutch IO is activated and moves together with the shaft 2a, which causes the actuator 12 to move as shown by the broken line, turning on the sensor 9. ing.

The output of the sensor 7.8.9 is applied to the controller 15, and also the timing signal TD from the reader (not shown). The controller 15 outputs a direction control signal DD and an operation permission signal HD to the motor controller 16 based on each input signal, and thereby the motor controller 16 switches the excitation of the stepping motor 1 to operate the stepping motor 1.

Now, since the sensor 9 is normally turned off by the actuator 12 as described above, the controller 15 executes normal feed control.

That is, when the document PP is inserted and the sensor 7 is turned off, the controller 15 sets forward rotation data in the direction control signal DD, raises the operation permission signal HD, and causes the motor controller 16 to rotate the stepping motor l counterclockwise. move in the direction. As a result, the drive roller 2
, 3 rotates in the document transport direction (sub-scanning direction), and the document PP
is conveyed in the sub-scanning direction A2 by the drive roller 2 and the driven roller 5.

Thereafter, when the leading edge of the document PP turns off the sensor 8, the controller 15 immediately lowers the operation permission signal HD and stops the stepping motor 1.

Thereby, the document PP is stopped at the reading preparation position. After this, in synchronization with the timing of the timing signal TD,
The stepping motor 1 is driven by the number of steps corresponding to one sub-scanning step by the controller 15,
The original PP is fed one sub-scanning step at a time.

By the way, with the document PP stopped at the reading preparation position,
When the operator discovers that the document is skewed, when the operator pulls the document PP in the direction of arrow A1 in an attempt to pull out the document PP, the drive roller 2 reverses clockwise.

This turns on the sensor 9 as described above, so
The controller 15 sets reverse data to the direction control signal DD and raises the operation permission signal HD. As a result, the drive rollers 2 and 3 are driven clockwise, and the document PP is conveyed in the direction of arrow A2.

This state continues until the rear end of the document PP passes through the sensor 7, and when the sensor 7 is turned on, the controller 15 stops the stepping motor 1. Note that when the stepping motor 1 stops, the actuator 12 is activated by the sensor 9.
If the sensor 9 is not turned off, the controller 15 appropriately operates the stepping motor 1 so that the sensor 9 is turned off.

In this manner, when an attempt is made to pull out the document PP which is sandwiched between the drive roller and the driven roller and is stopped at the reading preparation position, the document PP is automatically discharged toward the operator.

Note that even if the document PP is jammed during transportation, the document PP can be ejected in the opposite direction if the operator pulls the document PP.

Further, if the drive roller 2 is configured to be disconnected from the shaft 2a and the power transmission mechanism when an external force of a predetermined value or more is applied to the drive roller 2, it is possible to detect that the document is being pulled out during conveyance, and the document can be ejected.

[Effects] As explained above, according to the present invention, when an operator tries to pull out a document, the document is automatically ejected toward the operator, thereby preventing the document from being torn or twisted. . Another advantage is that it does not require much force when pulling out the original.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of the present invention, FIG. 2 is a perspective view showing details around an actuator, and FIG. 3 is a block diagram showing an example of a control section. ■... Stepping motor, 2, 3... Drive roller 4... Timing belt, 5, 6... Driven roller,
7.8.9...Sensor, 10...One-way clutch, 11...Boss part, 12...Actuator, 1
5...Fig. 7Fig. 2

Claims (1)

[Claims] A document conveyance device that conveys a document in a sub-scanning direction by a pair of a drive roller driven by a motor and a driven roller in contact with the drive roller, comprising a pull-out detection means for detecting that the document is pulled in a direction opposite to the conveyance direction; A document conveying device characterized in that the driving roller is reversely rotated depending on the direction of the extraction detection means.