JPS61162439A - Original copy feed device - Google Patents

Abstract

PURPOSE:To prevent an endless belt from being exerted with unreasonable force, by providing a roller support means for making a self-absorptive roller in contact with the surface of the endless belt under the weight thereof, so that the self-absorptive roller cleans the endless bet. CONSTITUTION:In a belt cleaning unit 30, the rotary shaft 40 of a self-absorptive roller 36 is fitted in elongagted holes 39 in the end walls 32 of an attaching frame 34, and the roller 36 is made in contact with the surface of an endless belt 10 under the weight of the roller 36. The material of the roller 36 is special silicon rubber, etc. from which a liquid such as lubrication oil, spontaneously oozes out to the outer surface of the roller 36. With this arrangement, pencil powder, eraser dust, etc. which are gradually accumulated on the surface of the endless belt 10 are removed by the roller 36 which is made in contact with the surface of the belt 10 under the weight of the roller, so that the surface of the belt 10 may be always maintained to be clean. Accordingly, an original copy may be transferred with a constant level of transfer force with no unreasonable force being exerted to the belt 10.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a document feeding device used in a copying machine, a facsimile machine, or the like.

2. Description of the Related Art In recent years, as copying machines have become faster and their needs have become more diverse, many copying machines that can be equipped with an automatic document feeder as an option have come on the market. The automatic document feeder places a large number of originals to be copied on the document table, feeds them onto the platen glass, which is the single-sheet exposure position, and automatically ejects the originals as soon as scanning exposure is completed. The structure is such that the next document is fed to the exposure position. When copying multiple sheet-like originals in this way, there is no need for the operator to set each original on the platen glass, which is the copying position, so this method is particularly useful when high-speed copying or labor saving is required. Since it is a very convenient device, most recent medium-sized and larger copying machines can be equipped with an automatic document feeder as an option.

This type of automatic document feeder has a document feeder that stacks many originals and places them on the document table, and sends out one sheet of the original, and a platen glass, which is the exposure position, for sending out the original from the document feeder. It is comprised of a document loading/unloading section into which the document is loaded and then discharged after exposure. The configuration of a typical document loading/unloading section of an automatic document feeder is, for example, as shown in FIG.
One wide endless belt 1o is wound around a roller pair consisting of a driving roller 12 and a driven roller 14, and by rotating the driving roller 12, the endless belt 10 is rotationally driven, and the friction of the endless belt 10 is reduced. The original 16 is conveyed by force to a predetermined position on the platen glass 18, which is the exposure position. However, in such a belt-type document feeder, if pencil-written documents are sent frequently, pencil lead powder, eraser shavings, etc. adhere to the surface of the endless belt, and the surface of the endless belt becomes dirty. At the same time, the frictional force decreases, which often results in poor conveyance. Furthermore, when copying a highly transparent original, there were also problems such as stains from the endless belt appearing on the copy.

Problem 1 to be solved by the invention: In order to solve the above-mentioned problems, in the past, the endless belt was manually cleaned of dirt, which was troublesome and caused people to neglect the cleaning process. was there. Therefore, the applicant previously proposed a cleaning device that presses a roll-shaped cleaning member against the belt, but with this device, excessive force is applied to the endless belt, resulting in damage to the belt and the driving force of the endless belt. There was a problem with the increase.

Therefore, the present invention overcomes the problems of the prior art described above, and
It is an object of the present invention to provide a document feeding device capable of cleaning an endless belt for document conveyance with a simple configuration.

Means for solving illumination points In order to solve the above-mentioned problems of the prior art, the present invention provides an arrangement in which an endless belt wound between a pair of rollers transports a document onto and from a document support surface. The document feeder is configured to include roller support means for bringing a self-adhesive roller into contact with the surface of the endless belt with its own weight, and the endless belt is cleaned by the self-adhesive roller. Provide a feeding device.

The material of the self-adhesive roller is preferably made of special silicone rubber, etc., from which a liquid such as lubricating oil naturally oozes out on the surface.Furthermore, as a means for supporting the roller, for example, a bracket is attached to the document cover. The bracket may be provided with an elongated hole in the vertical direction, and the rotating shaft protruding from both ends of the roller may be fitted into the elongated hole. The roller supporting means is not limited to the above-mentioned structure, but any supporting means that can support the self-adhesive roller on the surface of the endless belt with its own weight can be used. .

Function: When a single original is fed from the original feeding section of the automatic document feeder, the endless belt is rotated to transport the original to the exposure position on the platen glass, and the rotation of the endless belt is stopped. Stop temporarily. After exposure is completed, the endless belt is driven again and the original is ejected from above the platen glass.

At the top of the endless belt, there is a self-adhesive roller that rotates in contact with the endless belt due to its own weight.
The endless belt can be cleaned by adsorbing dirt such as pencil lead powder or eraser shavings with the rollers. According to the present invention, since the endless belt is cleaned by a self-adsorption roller that contacts the endless belt with its own weight, no excessive force is applied to the endless belt, and the torque of the drive motor is also increased. It is not necessary and the cleaning device of the present invention can be added.

EXAMPLES Below, the present invention will be explained in detail based on examples shown in the drawings. Referring to FIG. 1, there is shown a longitudinal sectional view of a document feeder according to the present invention, in which a platen glass 18 is provided at the top of a frame 20 of an electrophotographic copying machine to support a document at an exposure position. An exposure system, a photoreceptor, a developing device, etc. necessary for electrophotographic copying are arranged below the platen glass 18, and the image of the original 8116 placed on the platen glass 18 is transferred onto copy paper (not shown). It is meant to be copied. A document feed roller 22 is disposed on the right side of the platen glass 18, and an original WA 16 supplied from an automatic document feeder (not shown) disposed to the right of the document feed roller 22 is a document rotated clockwise. The platen glass 18 is moved by the feed roller 22.
It is designed to be transported upwards.

An endless belt 16 is attached to the driving roller 12 and the driven roller 14.
The driving roller 12 is connected to a driving means such as a motor (not shown), and the driving means rotates the driving roller 12 to rotate the endless belt 10 wound between both rollers 12 and 14. It is designed to be rotationally driven. When the driving roller 12 is rotated clockwise, the original 16 sent by the original feeding roller 22 is carried onto the platen glass 18. An exit gate 24 is provided below the drive roller 12 so as to be freely retractable in the vertical direction.
When the original 16 is loaded onto the platen glass 18, the exit gate 24 is projected upward and serves to position the original, and when the original is ejected, the exit gate 24 is retracted downward to prevent the original from being ejected. controlled so that it does not occur. A plurality of pads are provided at a plurality of locations, for example, two locations, on the outer circumference of the endless belt 10, and these pads are
It may be configured such that the document is transported reliably. A support member 28 extending in the width direction of the endless belt 10 is provided adjacent to the drive roller 12, and a belt cleaning unit 30 attached to the cover 26 is provided opposite to this support member.

The belt cleaning unit 30 comprises a mounting frame 34 having two end walls 32, 32, as shown in FIG. 3, and a self-adhesive roller 36 rotatably mounted to the frame.

The self-adhesive roller 536 is attached to the frame 34 by forming an elongated hole 38 in the end wall 32 of the frame, into which the self-adsorbing roller 36 protrudes from both ends. 40, and the self-adhesive roller 36 is attached so as to contact the surface of the endless belt 10 with its own weight. The material for the self-adsorption roller is preferably a special silicone rubber that naturally oozes out a liquid like lubricating oil on its surface, but is not limited to this. It is possible to use any material that has the following properties.

If cleaning work is continued with such a self-adsorbing roller, dust such as pencil lead powder or eraser shavings will adhere to the surface of the roller, reducing the cleaning effect. In this case, by removing the roller 36 and washing it with water, the dust on the surface of the roller can be thoroughly removed.

In order to make it easier to clean the surface of the roller 36, the belt cleaning unit 30 uses a simple cloth such as Velcro.
It is preferable that the cover 26 be detachably attached to the cover 26 with a snap-lock 42.

By repeating the operation of conveying the document 16 to the exposure position on the platen glass 18 and ejecting the document 16 from the exposure position by the document feeder of the present invention configured as described above, the pencil gradually forms on the surface of the endless belt 10. Dust such as lead powder and eraser shavings will adhere to the paper. However, according to the present invention, since the roller 36 made of a self-adsorbing material is disposed so as to contact the endless belt 10 by its own weight, the dust on the endless belt is removed by the self-adsorbing roller 36. 36
The belt surface can be kept clean at all times. If a large amount of dust adheres to the surface of the self-adsorbing roller 36 and the cleaning effect becomes less effective, the dust adhering to the roller surface can be easily removed by removing the roller 36 and washing it with water as described above. I can do it.

Effects of the Invention Since the present invention is constructed as described in detail above, the belt surface can be cleaned without applying excessive force to the endless belt, and the document conveying force is maintained at a constant level, and the document This has the effect of being able to reliably transport the materials.

Further, since the cleaning roll of the present invention is configured to contact the endless belt only by its own weight, the belt cleaning unit of the present invention can be added without increasing the motor torque for driving the endless belt.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of the document feeder of the present invention, FIG. 2 is a schematic perspective view showing a conventional document feeder, and FIG. 3 is a perspective view of a frame showing the installation of the belt cleaning unit used in the present invention. It is. 10: Endless belt 12: Drive roller 14: Followed roller 16: Original 18 nib platen glass 24: Exit gate 26: Cover 30: Cleaning unit 34: Mounting frame 36: Self-adsorption roller

Claims (1)

[Claims] In a document feeding device in which a document is conveyed onto and from a document support surface by an endless belt wound between a pair of rollers, a roller support means brings a self-adsorption roller into contact with the surface of the endless belt with its own weight. and configure it.
A document feeding device characterized in that an endless belt is cleaned by the self-adsorption roller.