JP3005736U - Paper feed pad - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To provide a paper feed pad capable of suppressing the occurrence of troubles associated with paper feed even after long-term use in a paper feed mechanism of office equipment. [Structure] This paper feed pad is attached to a paper feed roller, and has a hole 1 in a contact portion 2 with the paper.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a paper feed pad used in a paper feed mechanism of office equipment such as a copying machine and a facsimile.

[0002]

[Prior art]

 Conventionally, a paper feed roller (hereinafter, referred to as a roller) made of rubber or rubber foam and a flat paper feed pad (hereinafter, referred to as a pad) are combined in a paper feed mechanism in the above-mentioned office equipment. Have been adopted. When copying or sending multiple sheets of base paper in office equipment, they are stacked and set automatically. In automatic feeding, normally only the bottom (or top) sheet of paper is pulled out, and then the other paper on the top (or bottom) is automatically fed sequentially one by one. ing.

[0003]

[Problems to be solved by the device]

 Although such a paper feeding mechanism has good initial characteristics, if it is used for a long period of time, problems such as a double feeding phenomenon in which multiple sheets of paper are fed together or a state in which no paper is fed will occur. I couldn't avoid it. Generally, in the paper feeding mechanism, the pad is fixed with a certain pressure applied to the roller, but in that state, the friction resistance between the roller and the paper, the paper and the pad, and the paper and the paper are sequentially applied. It is required to be kept small. The relationship of such frictional resistance depends on the material and surface condition of the pad, and the frictional resistance is adjusted by changing the pressure applied to the pad. It is considered that the above relationship is broken and troubles occur due to changes in the surface condition due to surface wear and paper dust adhesion. Therefore, it is an object of the present invention to provide a pad capable of suppressing the occurrence of troubles associated with sheet feeding even in long-term use in a sheet feeding mechanism of office equipment.

[0004]

[Means for Solving the Problems]

 The present invention is characterized in that the paper feed pad attached to the paper feed roller is provided with a hole in the contact portion with the paper, and the aperture ratio is 50% or less with respect to the area in contact with the paper. The hole is provided.

The details of the pad of the present invention will be described below with reference to FIGS. FIGS. 1 (a) to 1 (d) are plan views showing different embodiments of pads, and in these drawings, 1 indicates whether or not the pad provided in the contact portion 2 with the paper is penetrated to some extent. A hole with a bottom that stops at the depth, and 3 is a hole for attachment to the device. The ratio of the total size of the holes 1 to the area of the pad in contact with the paper in each of the above embodiments (aperture ratio) is 10, 20, 50 and 60%, respectively. FIGS. 1 (e) to 1 (j) are plan views showing different embodiments of the pads, and in these pads, a hole 1 having various shapes as shown in the drawing is provided in a contact portion 2 with a paper. Only there is no mounting hole 3. As shown in the figure, the present invention has a technical feature in that a hole is provided in a portion of the pad that contacts the paper, and the shape of the hole depends on the thickness of the paper or the pad and the elastic force. Usually, it can be a circle, an ellipse, a rectangle, a polygon, an irregular shape, etc., but in particular, an ellipse or a rectangle whose paper feeding direction (the direction of the arrow in the figure) is long is preferable, and the diameter and dispersion are The shape of the pad can be arbitrarily designed, but the size is 50% or less in terms of the opening ratio, which is the ratio of the area of the pad that contacts the paper.

When the elliptical or rectangular hole is long in the width direction, the paper to be fed does not get caught in the hole or hit the corner of the paper to cause a paper feed error, and the pad itself due to wear of the corner of the hole. The total size of the holes does not exceed 50% of the area of the pad in contact with the paper, so as not to cause wear and tear and to keep the original paper separating function difficult. Preferably. Regarding the cross-sectional shape of the hole 1, as shown in FIG. 2 (a), the hole 1 has the same diameter and the edge of the opening edge is raised, and as shown in FIG. 2 (b), the hole 1 has the same diameter. In the case where the opening edge has an R, as shown in FIG. 2 (c), the hole 1 is opened only on the side of the contact portion 2 with the paper and the edge of the edge stands, FIG. 2 (d) As shown in FIG. 2 (e), symmetrical holes 1 and 1 having a trapezoidal cross section and an R at the periphery of the opening are provided from both sides through a central partition wall. There are various types such as those in which both ends of 1 are largely sculpted to form a trapezoidal cross section and the edge of the opening edge stands, or a combination of these. Among these, the edge of the opening edge is included. It is more preferable that the stand be upright or the hole 1 be penetrated. Such hole drilling on the pad causes wear and wear on the pad surface due to wear on the pad surface, causing wear powder and paper dust of the material itself to be drawn into the hole as the paper moves and discharged to the outside of the system. By preventing the change of the surface condition due to paper dust adhesion and maintaining the initial condition for a long time, it is possible to suppress the paper feed error in the automatic paper feed mechanism for a long time.

The material constituting the pad of the present invention is a plastic if it is an elastic material such that the frictional resistance between the pad and the paper is between the frictional resistance between the roller and the paper and the frictional resistance between the papers. There is no particular limitation on rubber or a composite material thereof, but for example, silicone rubber, chloroprene rubber, acrylonitrile rubber, butadiene rubber, ethylene / chloroprene and the like, which are heat-cured, are preferably used. In order to manufacture this pad, a die having a pad-shaped cavity with a predetermined hole is used to mold the above materials by any method such as press molding or cast molding, or according to the thickness of the pad. Alternatively, the sheet may be formed by using the sheet forming die and punched out by a punching die having a predetermined hole.

Next, a usage state of the pad of the present invention will be described. FIG. 3 is a front explanatory view schematically showing an automatic paper feeding state in a facsimile. In the drawing, 4 is a pad of the present invention, 5 is a roller, 6 is a paper tray, 7 is a pinch roller, P is paper, and an arrow. Indicates the rotation direction of the roller 5. In this paper feeding mechanism, the lowermost paper P ₁ among the plurality of papers P ₁ set on the paper receiving tray 6 by the roller 5 is first fed to the left side and picked up by the pinch rollers 7, 7. At this time, the leading edge of the paper P on the upper side of the paper P ₁ is pressed by the pad 4 from the upper side of the roller 5 to prevent double feeding of the paper. FIG. 4 is a front explanatory view schematically showing the automatic paper feed state in the manual feed section of the copying machine. In this case, of the plurality of paper sheets P set on the paper tray 6 by the roller 5, the first paper sheet is the first. The upper paper P ₂ is sent to the left side and picked up by the pinch rollers 7, 7. At this time, the leading edge of the paper P below the paper P ₂ is pressed by the pad 4 from below the roller 5 to prevent double feeding of the paper. As described above, the pad of the present invention is arranged such that when the rollers 5 sequentially feed the plurality of sheets of paper P set in the paper tray 6 one by one from the lowermost paper, the paper is placed above the second paper from the bottom. This is a pressing member that suppresses the leading edge of the paper and prevents the rollers 5 from being fed out in a state where two or more sheets are stacked, and is usually a sheet-like member with a thickness of 2 to 5 mm and a length and width of 30 x 25 mm. It is preferable to use an elastic member.

[0009]

[Action]

 The pad of the present invention is a conventional pad provided with holes, and its manufacturing method is substantially the same as that of the conventional pad. It is possible to prevent a change in the surface state due to, and to suppress the paper feed error for a long time by maintaining the same frictional resistance as in the initial stage.

[0010]

【Example】

 The pad of the present invention will be described with reference to specific embodiments. (Embodiment 1) As shown in FIGS. 1 (a) to 1 (d), four types of pads having a thickness of 2 mm and provided with through holes of the same diameter in a plan view are used for the automatic paper feeding mechanism of the facsimile shown in FIG. I put it on and did a practical test. For comparison, the same test was performed for the sample without holes. In Test 1, as an endurance test for four types of pads, 10 plain copy papers were set and piled every 1,000 sheets to be sent (plain paper), and the results of observing the automatic paper feed status and pad wear status were shown. The results are shown in Table 1 and Table 2.

[Table 1]

[0011]

[Table 2] It can be seen from Table 1 that by forming a hole in the portion of the pad that contacts the paper, it is possible to suppress a paper feed error in the automatic paper feed mechanism in the fax machine for a long period of time. Further, it can be seen from Table 2 that the wear state changes depending on the shape and size of the hole, but the present invention can maintain the effect even if the periphery of the hole is worn.

(Embodiment 2) As shown in FIGS. 1 (e) to 1 (j), 6 kinds of pads having a thickness of 5 mm are used in the automatic paper feeding mechanism of the manual feeding section of the copying machine shown in FIG. A practical test was performed by bonding with double-sided tape. For comparison, the same test was performed for the sample without holes. In Test 3, 20 sheets of plain copy paper (manufactured by Fuji Xerox Co., Ltd.) were stacked and set for the initial 3,000 sheets and after 6,000 sheets (the number of sheets of plain paper passed), respectively, and the results of observing the automatic feeding state Is shown in Table 3.

[Table 3] From Table 3, it is possible to suppress a paper feed error in the automatic paper feed mechanism of the manual feed section of the copying machine for a long time by providing a hole in the portion of the pad that contacts the paper, and in that case, the effect may be slightly different depending on the hole shape. It turns out that

[0013]

[Effect of device]

 When the pad of the present invention is applied to office equipment, it is possible to suppress a paper feed error for an extremely long period of time as compared with a conventional pad having no holes.

[Brief description of drawings]

1A to 1J are plan views showing different embodiments of the paper feed pad of the present invention.

2A to 2E are vertical cross-sectional views showing different embodiments of the holes in the paper feed pad of the present invention.

FIG. 3 is an explanatory front view schematically showing an automatic sheet feeding state of a facsimile.

FIG. 4 is a front explanatory view schematically showing an automatic paper feed state of a manual insertion portion of a copying machine.

[Explanation of symbols]

1 ... hole, 2 ... contact with paper,
3 ... mounting holes, 4 ... paper feed pad, 5 ...
Roller, 6 ... Paper tray, 7 ... Pinch roller, P ... Paper, P ₁ ... Bottom paper,
P ₂・ ・ ・ Top paper.

Claims (2)

[Scope of utility model registration request] 1. A paper feed pad attached to a paper feed roller, characterized in that a hole is provided at a contact portion with the paper. 2. A paper feed pad attached to a paper feed roller, wherein a hole having an opening ratio of 50% or less with respect to an area in contact with paper is provided.