JPH09142687A - Paper sheet feeding belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress generation of static electricity in running of a belt and prevent a document from being stuck on the belt, by weaving a twist yarn formed by twisting a conductive fiber into a core canvas for a paper sheet feeding belt. SOLUTION: A paper sheet feeding belt 1 is composed of tow-layer structure by laminating a polyurethane cover 12 on a core canvas 11. The core canvas 11 is so formed that a twist yarn formed by twisting a carbon evaporation fiber is woven as a warp 1a along with a weft 1b. For example, a carbon evaporation fiber is used as one of 40 polyester fiber, and a carbon evaporation fiber contained twist yarn formed by twisting these fibers and a twist yarn composed of a polyester fiber containing no carbon evaporation fiber are used as the warp 1a. The twist yarn formed by using polyester fiber for the all is used for the weft 1b. The carbon evaporation fiber contained twist yarn 1a is used in such ratio of 1 to 4 and the core canvas 11 is constituted by weaving these fibers. A polyurethane cover 12 is laminated on this core canvas 11 and the core canvas is wrapped across pulleys 2, 3 with its face down.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feed belt mainly used in an automatic document feeder (document feeder) for automatically feeding a document to a reading surface such as a contact glass in a copying machine or a facsimile. Regarding

[0002]

2. Description of the Related Art A paper feed belt of this type generally has a structure in which a polyurethane cover or the like is coated or laminated on the surface of a core body canvas woven with rubber alone or twisted yarn such as polyester fiber or nylon fiber. In particular, no antistatic treatment was performed.

[0003] In recent years, paper feed belts with antistatic properties have been put to practical use. This paper feed belt is obtained by mixing or kneading an antistatic agent made of an organic compound into the cover layer.

[0004]

However, the paper feeding speed in the automatic document feeder is increasing year by year, and the conventional paper feeding belt described above has the following disadvantages.

[0005] When the belt runs, the back surface of the belt repeatedly contacts and separates from the pulley that drives the belt or slips, thereby generating static electricity. Particularly in a low temperature and low humidity state, the charged voltage is extremely high (room temperature 18). ℃,
When the humidity is 50% and the belt traveling speed is 330 mm / sec, the traveling band voltage is 500 to 1000 V), so that the original may adhere to the paper feed belt. For this reason, the document cannot be sent to a predetermined position on the contact glass, or the document cannot be discharged after reading the image. Also, in a belt in which an antistatic agent is mixed in the cover layer, static electricity is generated when the running speed is increased. Since the generated static electricity is structurally difficult to escape, the charged voltage is increased as in the case of the conventional belt in which the antistatic agent is not mixed, and the document may stick to the belt.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and has as its object to provide a paper feed belt that suppresses the generation of static electricity during belt running and prevents a document from sticking to the belt.

[0007]

In order to solve the above-mentioned problems, the paper feed belt of the present invention has a core body cloth of the paper feed belt in which a twisted yarn in which conductive fibers are twisted is woven.

According to the above-mentioned paper feed belt, even if static electricity is generated when the belt is running, the static electricity passes through the conductive fibers in the body cloth in the belt, flows to the machine such as the automatic document feeder, and is discharged into the air. Is discharged. As a result, the paper feed belt is hardly charged with voltage, and therefore paper (original) does not stick to the belt.

As described in claim 2, it is desirable that the twisted yarn in which the conductive fiber is twisted is woven continuously along the running direction of the paper feed belt and at equal intervals in the width direction of the core canvas. .

[0010] Since the paper feed belt normally travels by rotating the pulleys while being wound between two pulleys, a twisted yarn in which a plurality of conductive fibers arranged in the traveling direction are twisted onto the pulleys. Since the belt travels (rotates) upon contact, static electricity generated when the belt travels flows through the pulley to the body and is discharged.

As described in claim 3, carbon vapor deposited fibers may be used as the conductive fibers.

Since carbon vapor-deposited fiber has superior wear resistance and flexibility as compared with metal fiber, it exhibits an antistatic effect during running of the belt for a long period of time and does not disturb the magnetic field. Suitable for built-in devices.

As described in claim 4, a polyurethane cover can be laminated on the surface of the body canvas.

Since the paper is conveyed in contact with the polyurethane cover, it is reliably conveyed by the surface of the polyurethane cover which has a higher friction coefficient than that of the body canvas, and can be easily wiped off even if the original document is contaminated. .

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a paper feed belt according to the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view schematically showing a state in which a paper feed belt according to this embodiment is wound around pulleys of an automatic document feeder. FIG. 2 is an enlarged view of a part of the paper feed belt in FIG. FIG.

As shown in FIG. 1, an endless paper feed belt 1 is wound around a pair of pulleys 2 and 3 arranged in parallel at a predetermined distance from each other. 1 rotates counterclockwise. A document (paper) placement portion is provided on the upper surface side of the paper feed belt 1, and the document A on the placement portion is moved to a predetermined position on the contact glass 4 on the lower surface side by the rotation of the paper feed belt 1. Then, the rotation of the paper feed belt 1 is stopped. Then, after the original A is read, the paper feed belt 1 starts rotating and the original A
Is discharged from above the contact glass 4.

The paper feed belt 1 according to the present invention comprises:
It has the following characteristic configuration. That is, FIG.
1, the paper feed belt 1 has a two-layer structure in which a polyurethane cover 12 is laminated on a core canvas 11. The body cloth 11 is a warp 1a made of twisted yarn in which carbon vapor-deposited fibers are twisted.
It is woven together with the weft 1b. Specifically, in this example, one of the 40 polyester fibers is carbon-deposited fiber (carbon particles are coagulated (vaporized) on the polyester fiber).
As the warp yarn 1a, a twisted yarn containing carbon vapor-deposited fibers obtained by twisting these fibers and a twisted yarn made of polyester fiber containing no carbon vapor-deposited fibers are used. In addition, a twisted yarn made entirely of polyester fibers is used as the weft 1b. The warp yarns 1a containing carbon-deposited fibers are used at a ratio of one out of four yarns, and are woven into the core body canvas 11.

A polyurethane cover 12 is laminated (laminated) on the thus woven core body canvas 11 to form a two-layer structure, and the core body canvas 11 is wound between the pulleys 2 and 3 with the back side.

The paper feed belt 1 of the present embodiment is constructed as described above. When this paper feed belt 1 is compared with a conventional general paper feed belt, the following differences in effect are obtained. occured. ○ Belt circumference: 1045 mm, belt width: 300 mm,
Belt thickness: 0.55 mm ○ Room temperature: 20 ° C, humidity: 55%, surface electric resistance is 100
V × 60 seconds Paper feed belt of this embodiment Conventional paper feed belt Traveling band voltage 10 to 30 V 500 to 1000 V Surface electric resistance 2.8 × 10 ⁹ Ω / cm 7.6 × 10 ⁹ Ω / cm Original sticking When the paper feed speed is changed (400 mm / sec to 1500 mm / sec) Without sticking With sticking As can be seen from the above results, the paper feeding belt 1 of this example has a high antistatic effect and a paper feeding speed of 1500 mm. The original A will not adhere to the paper feed belt 1 even if it is raised to about / second. This is the cardboard canvas 11 on the back of the paper feed belt 1.
Since the paper feed belt 1 runs while the carbon-evaporated fiber-containing warp yarns 1a arranged along the running direction of the belt are constantly in contact with the pulleys 2 and 3, the belt has excellent conductivity even if static electricity is generated. It flows to the pulleys 2 and 3 through a large number of carbon vapor deposition fibers in 1 and is discharged from there through the fuselage,
This is because the charged voltage of does not rise.

Although the embodiment of the paper feed belt of the present invention has been described above, the present invention can be carried out as follows.

A) Instead of carbon-deposited fibers as conductive fibers, metal fibers obtained by depositing copper sulfide on nylon fibers, for example, can be used.

B) The ratio of the conductive fibers to be twisted into the twisted yarn may be one out of thirty, one out of fifty, or two to three out of thirty to fifty.

C) The weaving ratio of the warp yarn of the conductive fiber-containing twisted yarn may be 1 to 2 to 12, and in order to enhance the antistatic effect, all the warp yarns 1a may be made of the conductive fiber-containing twisted yarn. it can.

[0025]

As is apparent from the above description,
The paper feed belt of the present invention has the following excellent effects.

(1) Even if static electricity is generated while the belt is running, the static electricity flows through the conductive fibers in the body cloth in the belt to the machine such as the automatic document feeder and is discharged into the air. Almost no voltage is charged on the document, and the document does not stick to the belt.

(2) In the belt according to the second aspect, since the plurality of twisted yarns containing conductive fibers arranged in the running direction contact the pulley and the belt runs, the static electricity generated during the running of the belt is reduced. It flows through the pulley to the fuselage and is reliably discharged.

(3) In the belt according to the third aspect, the carbon vapor-deposited fiber is more excellent in wear resistance and flexibility than the metal fiber, so that the antistatic effect during running of the belt is exhibited for a long period of time.

(4) In the belt according to the fourth aspect, the document is reliably conveyed while being in contact with the polyurethane cover having a higher friction coefficient than that of the surface body canvas.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing a state in which a paper feed belt according to an embodiment of the present invention is wound around pulleys of an automatic document feeder.

FIG. 2 is a side longitudinal sectional view showing a part of the paper feed belt of FIG. 1 in an enlarged manner.

[Explanation of symbols]

 1 Paper feed belt 1a Warp 1b Weft 2.3 Pulley 11 Core canvas 12 Polyurethane cover

Claims (4)

[Claims] 1. A paper feed belt mainly used in an automatic document feeder, wherein a twisted yarn in which a conductive fiber is twisted is woven into a core canvas of the paper feed belt. 2. The paper feed belt according to claim 1, wherein the twisted yarn in which the conductive fiber is twisted is woven continuously along the running direction of the paper feed belt and woven at equal intervals in the width direction of the core canvas. 3. The paper feed belt according to claim 1, wherein the conductive fiber is carbon vapor deposition fiber. 4. The paper feed belt according to claim 1, wherein a polyurethane cover is laminated on the surface of the body canvas.