JP2003002471A - Paper separating member, and device for preventing overlap feeding of paper sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper separating member and a device for preventing overlap feeding of a paper sheet capable of preventing overlap feeding of the paper sheet while suppressing generation of an abnormal sound, and reducing a size with a simple and low-cost structure. SOLUTION: The device for preventing overlap feeding of the paper sheet is provided with the paper separating member which includes a pressure-contact part (a friction member 18) with a paper feeding member (a feed roller 10) of the paper separating member (a retard pad 14), and is formed of material of specific gravity of >=1.4, and a pressure-contact part (the friction member 18) with the paper feeding member (the feed roller 10) of the paper separating member (the retard pad 14) is formed of a material of which the specific gravity is higher than that of the material for forming the surface of the paper feeding member (the feed roller 10) in the device for preventing overlap feeding of the paper sheet.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet separating member used in an image forming apparatus such as a copying machine / facsimile / printer for preventing double feeding of sheets while conveying the sheets, and a sheet separating member. The present invention relates to a double feed prevention device.

[0002]

2. Description of the Related Art In an image forming apparatus, predetermined sheets are stacked and accommodated, and the sheets in such a state are supplied to an image transfer section. At that time, two or more sheets are overlapped. Must be prevented from being supplied. As a means for this, a device using a pressure member (paper separating member) having a friction member pressed against a paper feed roller (paper feed member), a roller-shaped pressure member (paper A feeding device including a device that uses a separating member) is known.

In such a conventional method, a frictional force is generated between the paper and the friction member or between the paper and the friction roller, and the pressure member having the frictional member vibrates due to fluctuations in the frictional force. May occur and generate an abnormal sound, or the friction roller (paper separating member) may vibrate in the rotation direction to generate an abnormal sound (paper squeal such as stick-slip sound).
A method to prevent the generation of abnormal noise due to such vibration is
For example, JP-A-64-8147 and JP-A-63-18
063 publication. In the paper feeding apparatus disclosed in Japanese Patent Laid-Open No. 64-8147, a weight is added to a separating body that prevents the paper from being fed by overlapping a plurality of papers by coming into contact with a paper feeding roller (paper feeding member). By lowering the natural frequency of the vibration system, vibration is prevented from being excited and abnormal noise is reduced. Also, JP-A-63-180
In the sheet feeding device disclosed in Japanese Patent No. 638, an impact damper having a weight capable of reciprocating or a ratchet damper in which the weight vibrates in a viscous liquid is attached to a separating means having a friction member. This is intended to damp vibrations.

[0004]

However, the conventionally known sheet feeding device including the double-sheet feeding preventing device has the following problems. Japanese Patent Laid-Open No. 64-8147
In the paper feeding device disclosed in the publication, a large weight may have to be added in order to prevent vibration, and there is a problem that the device becomes large and heavy. Further, in the sheet feeding device disclosed in JP-A-63-180638, vibrations in the high frequency range can be effectively damped, but no effect can be expected for vibrations in the low frequency range. Further, the provision of the impact damper and the ratchet damper has a problem that the manufacturing cost becomes high.

Further, in Japanese Unexamined Patent Publication No. 6-80266, as a means for suppressing the stick-slip sound caused by the vibration of the sheet separating member, a structure in which a cone (anti-vibration member) is attached to the sheet separating member via a spring is provided. Is disclosed. With this configuration, the vibration of the sheet separating member can be sufficiently prevented and the stick-slip noise can be suppressed with a simple and low-cost configuration, but further improvement is required due to the recent demand for cost reduction and size reduction. Is the current situation.

An object of the present invention is to solve the above-mentioned conventional problems and achieve the following objects. That is, an object of the present invention is to provide a sheet separating member capable of preventing the double feeding of sheets while suppressing the generation of abnormal sound, capable of downsizing with a simple and low-cost configuration, and a sheet double feeding preventing device. To provide.

[0007]

The above problems can be solved by the following means. That is, the present invention <1> is a sheet separating member arranged in pressure contact with a sheet feeding member for conveying sheets in a sheet double feeding preventing device for preventing double feeding of sheets while conveying the sheet, The material forming the pressure contact portion of the paper separating member with the paper feeding member is
The sheet separating member is made of a material having a specific gravity of 1.4 or more. <2> The material having a specific gravity of 1.4 or more is a material containing at least silicon rubber and at least one selected from calcium carbonate, zinc oxide and quartz. > The sheet separating member described in.

<3> A paper double feed preventing device for preventing double feed of paper while feeding the paper, comprising a paper feed member for feeding the paper and a paper separating member arranged in pressure contact with the paper feed member. And the paper separating member is the above <1> or <2
> The sheet separating member according to the above item>.

<4> A paper double feed preventing device for preventing double feed of paper while feeding the paper, comprising a paper feed member for feeding the paper and a paper separating member arranged in pressure contact with the paper feed member. According to another aspect of the present invention, there is provided a sheet multi-feed preventing device, wherein a specific gravity of a material forming a pressure contact portion of the sheet separating member with the sheet feeding member is higher than a specific gravity of a material forming a surface of the sheet feeding member. .

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below. (Sheet Separation Member) The sheet separation member of the present invention is arranged in pressure contact with a sheet feeding member that conveys a sheet in a sheet double feeding prevention device that prevents double feeding of the sheet while conveying the sheet. The material forming the pressure contact portion with the sheet feeding member is a material having a specific gravity of 1.4 or more. According to the present invention, the specific gravity of the material forming the pressure contact portion of the paper separating member with the paper feeding member is set to 1.4 or more, so that the vibration generated when the paper is conveyed without disposing a vibration isolator or the like. Can be prevented, and abnormal noise such as stick-slip noise (paper squeaking noise) can be suppressed. Therefore, the paper separating member of the present invention can prevent the double feeding of paper while suppressing the generation of abnormal sound, and can be downsized with a simple and low-cost configuration.

In the paper separating member of the present invention, the specific gravity of the material forming the pressure contact portion with the paper feeding member is 1.4 or more, preferably 1.4 to 1.8, and more preferably 1. Four
~ 1.6. If the specific gravity is less than 1.4, it is impossible to sufficiently prevent the vibration generated when the sheet is conveyed, and an abnormal sound such as a stick-slip sound (paper squeaking sound) is generated. On the other hand, when it exceeds 1.8, the coefficient of friction between the sheet separating member and the sheet becomes lower than the coefficient of friction between the sheets, and the sheets may be double-fed, which is not preferable.

In the paper separating member of the present invention, the material forming the pressure contact portion with the paper feeding member is not particularly limited as long as the specific gravity is 1.4 or more. For example, at least silicon rubber (for example, dimethyl silicone rubber) is used. And the like) and at least one selected from calcium carbonate, zinc oxide and quartz. In the present invention, silicon rubber is filled with an appropriate amount of at least one selected from calcium carbonate, zinc oxide, and quartz as a high-specific-gravity filler, so that the specific gravity can be appropriately adjusted easily without causing document stains or the like. be able to.

The paper separating member of the present invention is not limited in its shape and may be a pad or a roller. In the case of a pad shape, the paper separating member is usually composed of a pressing member and a friction member forming a pressure contact portion with the paper feeding member, and the friction member is made of a material having a specific gravity of 1.4 or more. On the other hand, usually in the case of a roller, it is composed of a core material and a layer formed on the surface of the core material (outer peripheral surface), and at least the outermost surface layer of the layer is made of a material having a specific gravity of 1.4 or more. Composed.

(Paper Double Feed Prevention Device) The first paper double feed prevention device of the present invention will be described. A sheet double feeding prevention device of the first aspect of the present invention includes a sheet feeding member for feeding sheets and a sheet separating member arranged in pressure contact with the sheet feeding member, and prevents double feeding of sheets while feeding the sheets. The paper separating member according to the present invention is provided as the paper separating member. In the present invention, by providing the above-described paper separating member of the present invention, it is possible to prevent the vibration that occurs when the paper is conveyed without disposing a vibration isolating member or the like, and to make a stick-slip sound (paper squeaking noise). The abnormal sound of can be suppressed. Therefore, the sheet double feeding prevention device of the first aspect of the present invention can prevent the double feeding of sheets while suppressing the generation of abnormal noise, and can be downsized with a simple and low-cost configuration. .

A paper double feed prevention device of the second invention will be described. A paper double feed prevention device of the second aspect of the present invention includes a paper feed member for carrying paper and a paper separating member arranged in pressure contact with the paper feed member, and prevents double feed of paper while carrying the paper. The specific gravity of the material forming the pressure contact portion of the sheet separating member with the sheet feeding member is higher than the specific gravity of the material forming the surface of the sheet feeding member. In the present invention, the specific gravity of the material forming the pressure contact portion of the paper separating member with the paper feeding member is made higher than that of the material forming the surface of the paper feeding member, so that the paper separating member can be provided without disposing a vibration isolating member. It is possible to prevent vibration that occurs when the paper is conveyed and suppress abnormal sounds such as stick-slip sounds (paper squeaking sounds).
For this reason, the paper double feeding prevention device of the second aspect of the present invention can prevent the double feeding of paper while suppressing the generation of abnormal noise, and can be downsized with a simple and low-cost configuration. .

In the paper double feed prevention apparatus of the second aspect of the present invention, the specific gravity of the material forming the pressure contact portion of the paper separating member with the paper feeding member is higher than the specific gravity of the material forming the surface of the paper feeding member, From the viewpoint of preventing the vibration that occurs when the paper is more effectively conveyed, the difference in specific gravity is 0.4 to 0.
It is preferably 8 and more preferably 0.4 to 0.
It is 6. If this difference is less than 0.4, it is not possible to sufficiently prevent the vibration that occurs when the sheet is conveyed, and an abnormal sound such as a stick-slip sound (paper squeaking noise) is generated, or a sufficient sound is generated. The propulsive force of the paper may not be obtained, and paper jam may occur. On the other hand, when the value exceeds 0.8, the sheets may be double-fed. Further, the sheet separating member of the present invention can be preferably used as the sheet separating member in the double sheet feeding preventing device of the second aspect of the present invention.

In the sheet double feed prevention apparatus of the present invention (first and second), the sheet feeding member is usually in the form of a roll and is not particularly limited as long as it satisfies the above conditions.
On the surface of the core material, an elastic layer made of polyolefin rubber (for example, ethylene propylene rubber, chlorinated polyethylene, chlorosulfonated rubber, etc.), polynorbornene or polyurethane, and a thermoplastic resin (for example, polyethylene, polypropylene, vinyl chloride, polyethylene) Examples thereof include those in which a surface layer made of terephthalate, polyamide, fluororesin, urethane resin, etc.) is sequentially laminated. In addition,
The material forming the surface layer of the feed roller is preferably one whose specific gravity is appropriately adjusted to 1.0 to 1.1.

Here, a preferred example of the sheet double feed prevention device of the present invention (first and second) will be shown. However, the present invention is not limited to this. The paper double feed prevention device shown in FIG. 1 includes a feed roller (paper feed member) 10 that conveys paper.
And a retard pad (sheet separating member) 14 rotatably supported and urged toward the feed roller 10 by a spring member 12. The retard pad 14 includes a pressure member 16 rotatably supported, and a friction member 18 attached to the upper surface of the pressure member 16 and forming a pressure contact portion with the feed roller 10.

In the sheet double feed prevention apparatus shown in FIG. 1, when the sheet is fed to the pressure contact portion between the feed roller 10 and the retard pad 14 (friction member 18), the feed roller 10 is driven to rotate. , The paper is sandwiched between the retard pad 14 (friction member 18) and conveyed. Further, when the sheets are fed in an overlapping manner, the surface of the retard pad 14 (friction member 18) is rubbed with the sheets, and the lower one of the stacked sheets is stopped by this friction force. The feed roller 10 is pressed against the upper sheet, and slides between the stacked sheets to convey only the upper sheet.

In the sheet double feed prevention apparatus shown in FIG. 1, in the case of the first sheet double feed prevention apparatus of the present invention, the retard pad 14 is provided with the sheet separation member of the present invention. Further, in the case of the sheet double feed prevention device of the second aspect of the present invention, the feed roller 1 in the retard pad (sheet separating member) 14 is provided.
The specific gravity of the material forming the friction member 18 pressed against 0 is
It is higher than the specific gravity of the material forming the surface of the feed roller 10.

The paper double feeding prevention device of the present invention (first and second) can be arranged, for example, in a paper conveyance path in an image forming apparatus or incorporated as a member constituting a part of a paper feeding device.

[0022]

EXAMPLES The present invention will be described more specifically below with reference to examples. However, each of these examples does not limit the present invention. (Examples 1 to 9 and Comparative Examples 1 to 3) According to Table 1, dimethyl silicone rubber was filled (or not filled) with calcium carbonate, zinc oxide or quartz as a filler, and a material whose specific gravity was adjusted was used. The retard pads of Examples 1 to 9 and Comparative Examples 1 to 3 were prepared by forming pressure contact portions (friction members 18) with the feed rollers.

Each of the obtained retard pads is used as the retard pad 14 in the sheet double feed prevention device shown in FIG.
Installed as a feed roller 10 and retard pad 1
4 was fed to the pressure contact portion with 4 (friction member 18) and conveyed, and abnormal noise (stick slick noise) generated at that time was examined. The results are shown in Table 1.

-Evaluation of Abnormal Sound (Stick Slick Sound) -The abnormal sound is OH in the paper double feeding prevention device shown in FIG.
A P film (“JE001” manufactured by Fuji Xerox Office Supply Co., Ltd.) was passed through, and the abnormal sound generated at that time was heard and evaluated. The evaluation criteria are as follows. 0: No abnormal sound is generated. 1: Some abnormal noise is generated. 2: An abnormal sound is generated. 3: A very loud abnormal sound is generated.

[0025]

[Table 1]

From the results shown in Table 1, the retard pad in which the specific gravity of the material forming the pressure contact portion with the feed roll (feeding member) is 1.4 or more has a low abnormal sound (stick slick sound) and good results are obtained. You can see that it is being done. As a result, it can be seen that the occurrence of abnormal noise can be prevented with a simple configuration without providing a vibration damping member. Further, in all of the examples and comparative examples, the double feed prevention function functions sufficiently,
The paper passing property was good.

(Example 10, Comparative Examples 4 to 5) According to Table 2, dimethyl silicone rubber was filled with calcium carbonate, and a material whose specific gravity was adjusted was used to form the pressure contact portion with the sheet feeding member ( A friction pad 18) was used to prepare a retard pad. Further, according to Table 2, a dimethyl silicone rubber was filled with a cross-linking agent and an inorganic filler, and a material whose specific gravity was adjusted was used to form a surface layer on each core material to prepare a feed roller (paper feeding member). . In this way, the retard pad and the feed roller of Example 10 and Comparative Examples 4 to 5 were obtained.

The retard pad and the feed roller thus obtained are mounted as the retard pad 14 and the feed roller 10 in the sheet double feed prevention apparatus shown in FIG. 1, and the pressure contact portion between the feed roller 10 and the retard pad 14 (friction member 18) is attached. The paper was fed and conveyed to the sheet, and an abnormal sound (stick slick sound) generated at that time was examined in the same manner as in Example 1, and further, the sheet passing property was also examined. The results are shown in Table 2.

-Evaluation of Paper Passability-The paper passability is determined by using the paper (P paper A manufactured by Fuji Xerox Office Supply Co., Ltd.) in the paper double feed prevention device shown in FIG.
3) Paper was passed and evaluated. The evaluation criteria are as follows. ◯: Double feeding and paper jam does not occur (occurs at a rate of 1/1000 sheets) Δ: double feeding and paper jam occurs slightly (occurs at a rate of 1/100 sheets) x: double feeding and paper jam occurs Yes (occurs at a rate of 1/10)

[0030]

[Table 2]

From the results shown in Table 2, it is found that the specific gravity of the material forming the pressure contact portion of the retard pad (paper separating member) with the feed roller (paper feeding member) is higher than the specific gravity of the material forming the surface of the feed roller. It can be seen that good results were obtained for the abnormal sound and the paper passing property. On the other hand, it can be seen that when the specific gravity of the material forming the surface of the feed roller is higher or the same, the paper passing performance is not good.

[0032]

As described above, according to the present invention, it is possible to prevent the double feeding of the paper while suppressing the generation of the abnormal sound, and the paper separating member which can be downsized with the simple and low cost structure, and the paper. A double feed prevention device can be provided.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an example of a double-sheet feeding prevention device of the present invention.

[Explanation of symbols]

10 Feed roller (paper feed member) 12 Spring member 14 Retard pad (paper separating member) 16 Pressure member 18 Friction member

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takazato Nakazato             Fuji Zero, 2274 Hongo, Ebina City, Kanagawa Prefecture             Co., Ltd. Ebina Office (72) Inventor Hiroaki Suzuki             1-4-25, Kitanomachi, Atobe, Yao City, Osaka Prefecture             Inside Nishiki Castle Co., Ltd. F-term (reference) 3F343 FA01 FB02 FB04 FC28 GA01                       GB01 GC01 GD01 HD09 HD18                       JD02 JD08 KB05 LA04 LA18                       LB08 LC07 LD04

Claims (4)

[Claims] 1. A sheet separating member which is arranged in pressure contact with a sheet feeding member for conveying sheets in a sheet double feeding preventing device for preventing double feeding of sheets while conveying the sheet. The sheet separating member, wherein the material forming the pressure contact portion with the sheet feeding member is a material having a specific gravity of 1.4 or more. 2. The material having a specific gravity of 1.4 or more is a material containing at least silicon rubber and at least one selected from calcium carbonate, zinc oxide and quartz. The sheet separating member according to Item 1. 3. A sheet double feed prevention device comprising a sheet feeding member for feeding sheets and a sheet separating member arranged in pressure contact with the sheet feeding member, for preventing double feeding of sheets while feeding the sheets. The sheet separation member is the sheet separation member according to claim 1 or 2. 4. A sheet double feed prevention device comprising a sheet feeding member for feeding sheets and a sheet separating member arranged in pressure contact with the sheet feeding member, for preventing double feeding of sheets while feeding the sheets. And a specific gravity of a material forming a pressure contact portion of the sheet separating member with the sheet feeding member is higher than a specific gravity of a material forming a surface of the sheet feeding member.