JPS6274846A - Document transfer device - Google Patents

Abstract

PURPOSE:To obtain a compact and easy to operate device, by disposing a drive motor of a document transfer unit at the inside of an inverting passage. CONSTITUTION:A drive motor M is contained at the inside of an inverting section 25b. The motor M has a shaft passing through a base plate 1 for transmitting power to respective drive members assembled in the back of the base plate A. More specifically, rotation of the motor M is transmitted from a pulley P1 to a pulley P2 with slow down for driving a belt drive roller 28a and it is simultaneously transmitted from the pulley P2 to pulleys P3 and P4. The pulley P3 drives a paper feed roller 23a and drives inverting rollers 23b-d through a gear G1 or G2. In addition, the pulley P4 transmits rotation to a feed out roller 21 and a loosening belt 22a through a clutch C and they are driven together with the belt drive roller 28a. Further, respective drive members other than the drive motor M and small in size and occupy only a small depth dimension on the back of the base plate A, whereby a document transfer device 20 is small in size.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a document conveying device used in addition to a recording device such as an electrophotographic copying machine.

[Conventional technology]

Automated document feeders (ADFs) have already been provided as devices that can efficiently supply originals to be copied to recording devices even when unattended, but in the past, they mainly copied only one side of the original. Functionality was limited to those that perform

On the other hand, with the recent development of recording devices that can make continuous copies on both sides of recording paper, the need for ADFs that can copy double-sided originals has increased, and there are many mechanisms for reversing originals in ADFs. has been devised.

Regarding them, JP-A No. 59-216159, JP-A-53-112738, and Utility Model Application No. 59-4548
There are proposals such as Japanese Patent Application Publication No. 60-8834.

[Problem that the invention seeks to solve]

However, such an ADF that can copy the front and back sides of a document requires driving a large group of transport rollers to not only carry out and transport the document, but also to reverse the front and back sides of the document. It has a built-in powerful drive motor, and is controlled to rotate forward, reverse, and stop depending on the document transport situation by a control unit inside the device or a signal from the recording device itself. No A
In the case of a DF, the drive motor cannot be accommodated within the space of the document conveyance path due to its mechanism, and therefore, in many cases, a special space is provided outside the document conveyance path to accommodate the drive motor.

As a result, the volume of the ADF tends to increase, and the center of gravity tends to be inappropriate, resulting in poor handling.

In order to solve this problem, the present invention improves the configuration of the document reversing section, and as a result, it is possible to house the drive motor inside the document conveyance path, thereby providing a compact document conveyance device with good operability. This is the purpose.

[Means for solving problems]

The above object is to provide a document transport device that transports the document onto a platen glass, performs exposure, and then transports the document into a document reversing unit configured with a reversing path, and then reverses the document surface from front to back and transports the document onto the platen glass. This is achieved by a document conveying device characterized in that a driving motor of the document conveying device is disposed inside the reversing path.

〔Example〕

An embodiment of the invention is shown in FIGS. 1 and 2.

The figure shows the recording apparatus main body 10 viewed from the front with broken lines. On the upper surface of the apparatus main body 1O, an outline of the document feeding device (hereinafter referred to as ADF) of the present invention is indicated by a broken line.
20 is mounted in a structure that can be opened to the rear side by support with a hinge or the like, but in the case shown in the figure, the ADF 20 is tilted to the front side and the document conveyance bell) 30 is pressed against the platen glass 11 on the top of the main body 10 of the apparatus. situation.

In other words, the ADF 20 is capable of automatically feeding a document using a transport mechanism to be described below, but it also functions as a normal platen cover by manually opening and closing the entire ADF 20.

The document transport mechanism in the ADF 20 includes transport members shown in FIG. 1 between the substrates A and B, and drive members (see FIG. 1) for rotating the transport members on the back side of the board. (indicated by the two-dot chain line)
are arranged respectively, and are configured to be driven and rotated by the power of a drive motor M.

First, to explain how the ADF 20 transports documents, there is a document feeding tray 40 on the top of the ADF 20, which stacks documents in page order with the first side facing up. As the motor M rotates, each roller group begins to rotate due to the operation of a mechanism section to be described later, and the feed roller 21 presses the top surface of the leading edge of the document tray with its own weight, and then begins to rotate in the direction of the arrow to release the top first surface. The document with the upper surface facing forward is sent out along the guide plate 24a.

Subsequently, the manuscript is squeezed by the handling bell) 22a and the cutting roller 22b, and only the topmost sheet slides onto the guide plate 24b, and its tip reaches the paper feed roller 23a, which rotates in the direction of the arrow. When this point is reached, a detection signal from a sensor (not shown) cuts off the power transmission to the feed roller 2 and makes it free to rotate.

The original document conveyed by the paper feed roller 23a is conveyed through the V-shaped guide portion 5a, thereby removing the shielding member 27 provided at the exit of the guide portion 25a with the tip of the original document tray. Then, it reaches the conveyor belt 30, which is stretched between the belt drive roller 28a and the driven roller 28b, which rotate clockwise, and conveyance is continued by the frictional force thereof.

On the other hand, the document which is conveyed by the conveyance belt 30 while sliding to the left on the platen glass 11 has its left end connected to the document stopper member 1 provided at the left edge of the platen glass 11.
When the conveyor belt 30 comes into contact with and stops, the conveyor belt 30 slips on the document tray and idles, but immediately after that, the rotation of the belt drive roller 28a is temporarily stopped by a signal sent from the control section after a predetermined time delay by the sensor described above. It is supposed to be done. Note that if the belt drive roller is controlled to be stopped during the time when the document stops, the document stopper member may not be used.

In this state, the document is pressed onto the platen glass 11 by the conveyor belt 30 which receives the weight of a plurality of driven and rotating pressure rollers 29, and exposure of the first side is started, and then a well-known process is carried out. One-sided copying is completed by forming an image and transferring it to recording paper.

Furthermore, in the ADF 20, the platen glass 11
A document reversing section 25b is provided on the right side of the document reversing section 25b for reversing the document front and back through a reversing path formed by a pair of thin metal plates, resin plates, etc., and its ejection port opens and connects to the guide section 25a described above. The loading port is configured to open at the right edge of the platen glass 11.

At important points in the reversing section 25b, there are conveyor rollers for reversing that rotate in the direction of the arrow, that is, reversing roller groups 23b, 23 (
! , 23d are arranged, and near the entrance facing the platen glass II, there is a photocoupler consisting of a light emitting section 26a and a light receiving section 26b for detecting the document passing through the reversing section 25b. A sensor 26 is arranged.

On the other hand, the original document whose first side has been exposed by the above-described process is transported rightward on the platen glass 11 by the transport belt 30 because the transport roller 28a starts rotating counterclockwise in synchronization with the end of exposure. put out.

The right end of the conveyed document is blocked by the shielding member n, so that it does not enter the guide section 25a, and therefore the document is smoothly fed into the reversing section 25b.

Therefore, the original is transported by the transport rollers 23 d, 23 C, 23 b.
After circulating counterclockwise in the reversing section 25b in this order, the right end of the original document, that is, the leading end in this case, reaches the guide section 25a and is sent out onto the platen glass 11 again, excluding the shielding member 27. Since the path length of the reversing unit 25b is set in advance to be longer than the maximum length of the various document trays used, the left end, that is, the leading end of the document tray passes through the light beam of the 26 photosensors in advance. Based on this signal, the rotation of the belt drive roller 28a is again switched clockwise.

Therefore, the document sent onto the platen glass 11 is reversed by passing through the reversing section 25b, and is conveyed by the conveyor belt 30 to the document stopping position as described above with the back side, that is, the second surface, facing the platen glass 11. be done.

Then, the rotation of the belt drive roller 28a is stopped again by a signal sent to the photo sensor after a predetermined time delay. In other words, the belt driving roller 28a stops during the time required from when the document is detected by the photosensor 26 until it reaches the document stopper member 12, or after a predetermined time delay from the above.
Become.

On the other hand, during this time, in the main body 10, the recording paper that has been copied on one side is reversed after fixing, and is in a position where the back side can be transferred.
Following the stoppage of step a, exposure, image formation, and transfer of the back side, that is, the second side of the document tray, are performed within the apparatus main body 10.

When the exposure of the back side of the document sheet is completed, the document stopper member 12 is retracted by the action of an electromagnet or the like, and then the conveyance roller 28a starts rotating clockwise again and the conveyance belt 30 conveys the document sheet to the left. The documents are sent out to a document discharge tray 50 provided outside the ADF 20, and the documents are sequentially stacked as copying is repeated.

The functions of each of the conveying members are operated by a driving motor M, which will be described next, and each driving member rotated by the driving motor M.

The driving motor M is generally large in size and equipped with a reduction gear device due to its large load, and therefore requires a large space within the device 20 to house it. In the device, by accommodating the drive motor M inside the reversing portion 25b, it is effective to make the device 20 relatively compact.

Therefore, the shutoff of the driving motor M is configured to pass through the substrate A and transmit power to each driving member assembled on the back surface of the substrate A.

That is, the rotation of the drive motor M is transmitted through the timing belt from the pulley P1 to the pulley IJ-P2 at a reduced speed to drive the belt drive roller 28a, and at the same time, the rotation is transmitted from the pulley P2 through the timing belt to the pulley IJ-P2. P3 and is transmitted to pulley P,1.

The boot IJ-P 3 drives the coaxially integrated paper feed roller 23a, and further drives the reversing rollers 23b, 23c, 23d via gear G1 or G2.
The gears Gl and G2 are designed to drive
are installed on the same axis, respectively, IJ-PGI, PC
; a one-sided clutch is provided between the gears 2 and 2 that engages only in the case of mutually opposing rotational directions to make either the gear G1 and the gear IJ-PGI or the gear G2 and the gear U-PC2 coaxially integral; , and the direction of rotation of the paper feed roller 23a is determined by the direction of rotation of the paper feed roller 23a.
3c and 23d are both rotated only in the counterclockwise direction.

In addition, from the boot IJ-P 4, the feed roller 21
Rotation is transmitted to the handling belt 22a through a clutch C, and the belt drive roller 28
It is designed to be driven together with a.

Each of the drive members except for the drive motor M is a small member, and the depth dimension occupying the back surface of the substrate A is small, and the volume of the fruiting device 20 is small and easy to handle. There is.

Note that the sensors 26a and 26b are not limited to optical sensors,
It may be located within the guide portion 5a common to the reversing portion. Further, the stopper member 12 may not be provided. The main body 10 does not have to be an automatic double-sided copying machine. Furthermore, .

When the document is ejected, the document may be turned upside down again before being ejected.

〔Effect of the invention〕

According to the present invention, the drive motor, which serves as the power source for document conveyance, is housed inside the document reversing section formed in a circular manner, thereby making the apparatus more efficient than the conventional system in which the drive motor is installed outside the conveyance path. It is an object of the present invention to provide an original document conveying device that is compact, can be equipped with a large or powerful drive motor, and is capable of reliably reversing an original.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional configuration diagram of a document conveying device according to the present invention. FIG. 2 is a plan view of essential parts of the device. DESCRIPTION OF SYMBOLS 10...Recording apparatus main body 11...Platen glass addition...Document feeder (ADF) 21...Feeding roller 23a...Paper feed roller 23b-23d...Reversing roller 25a...Guide Part 25b... Inversion part 28a
... Belt drive roller 30 ... Conveyor belt M ... Drive motor G
l, G2... Gears P1 to P4, PGI, PC2... Pulley D.
・・Manuscript A, B・・Board C・・Clutch

Claims (1)

[Claims] The document is transported onto a platen glass, exposed to light, and then transported into a document reversing unit configured with a reversing path. A document conveying device characterized in that a driving motor of the conveying device is disposed inside the reversing path.