JPH1135189A - Film type gripping member, manufacture thereof, gripping rotational member and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gripping rotational member, by which a sheet to be conveyed can be easily stuck/hooked on minute projections formed on the surface of the gripping rotational member so as to be conveyed with high precision, such as a gripping roller and a manufacturing method thereof. SOLUTION: An electroformed metallic mold α1 in which multiple comical recess parts 21 are formed on a surface 112 of a copper cylindrical member 1 is prepared. According to an electroforming method, nickel is deposited in the form of a film on the surface 112. The nickel film is separated from the surface 112 so as to be used as a film type gripping member. The film type gripping member is wound around a pipe and welded by spot welding, and consequently, a grip roller (gripping rotational member) can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary member for grip such as a grip roller which can be preferably used for conveying sheets (for example, paper) in OA equipment such as printers, copiers and facsimile machines, and other equipment. And its manufacturing method. Further, the present invention relates to a film-like grip member which can be used for producing such a grip rotation member, and a method of manufacturing the same.

[0002]

2. Description of the Related Art In OA equipment such as printers, copiers, and facsimile machines, generally, rollers such as paper and OHP sheets are transported or moved in predetermined directions and positions. Is used. As such a roller, a roller whose surface layer is made of a rubber material is generally and often used.

For example, in order to feed a sheet in a predetermined direction,
A pair of rollers as shown in FIG. 24 is used. The roller 92 is rotatably supported at a fixed position, and can be driven to rotate counterclockwise in the figure by a driving device including a motor (not shown). The roller 91 is rotatably supported, and is pressed against the roller 92 by a pressing device (not shown). The roller 91 is a so-called pinch roller. When the sheet S is fed, for example, to the left in the figure, the sheet S is held between the rollers 91 and 92, and the roller 92 is driven to rotate counterclockwise in the figure. The sheet S is sent to the left in the drawing by the frictional force with the rotating roller 92.

For example, a roller is also used to take out one stored sheet from a sheet tray, a sheet cassette, or the like that stores a plurality of sheets in a stacked manner and feed the sheet in a predetermined direction. In the example shown in FIG. 25, a plurality of sheets S are stacked and stored in the sheet tray 97,
Of the plurality of sheets S stored in the tray 97,
A roller 94 is arranged above the tray 97 to take out only the uppermost sheet S and feed it in the left direction in the figure. A shaft 98 is provided on the bottom surface 971 of the tray 97.
A push-up plate 98 is arranged so as to be swingable about 1. The push-up plate 98 is urged upward by a spring 96 to bring the sheet S into contact with the roller 94.
When the roller 94 is driven to rotate clockwise in FIG.
Due to the frictional force between the sheet 4 and the sheet S, the uppermost sheet S is fed leftward in the figure.

As described above, the rollers 92 and 94 move the sheet in a predetermined direction by the frictional force between the rotating roller and the sheet. Therefore, if the frictional force is small, the roller slides on the sheet and cannot convey the sheet. Therefore, the roller and the sheet are pressed against each other with a large force. For example, the pinch roller 91 in FIG. 24 is pressed toward the roller 92 with a large force. The push-up plate 98 in FIG. 25 pushes the sheet S upward with the roller 94 by a large force of the spring 96.

[0006]

However, if the roller and the sheet are brought into contact with such a large force, for example, the following problem may occur. For example, if a plurality of sheets S stored in the sheet tray 97 in FIG. 25 are single-sided copied sheets and the upper side in the figure is the already copied side, the roller 94 is used to transfer the uppermost sheet S When the sheet S is sent out, the lower surface of the uppermost sheet S rubs against the already copied upper surface of the sheet S immediately below the uppermost sheet S, and The side surface may become dirty. In this case, if the upward pushing force of the push-up plate 98 or the like is weakened, it is possible to prevent the lower surface of the sheet S from being stained. However, the sheet S cannot be sent out.

On the other hand, apart from such a problem, there is also the following problem. As described above, the roller whose surface layer is made of a rubber material is often used. For this reason, if the surface rubber deteriorates due to long-term use or the like, a sufficient frictional force is not generated between the roller and the sheet, and the roller may slide on the sheet. In the worst case, the sheet may not be able to be sent at all.

To solve such a problem, X
In a Y plotter or the like, for example, Japanese Patent Laid-Open No.
In Japanese Patent Publication No. 32, the following roller is proposed. That is, as shown in FIG. 26, a grip roller 93 in which a number of minute projections 931 are formed on the outer peripheral surface of a cylindrical body made of a metal material. This grip roller 9
When the grip roller 3 is used instead of the roller 92 in FIG. 24, for example, the protrusion 931 formed on the outer peripheral surface of the roller pierces the sheet S. The protrusions 931 are pierced one after another in S, and the sheet S is fed to the left in the figure while being combined with the protrusions 931.

Further, as described above, the grip roller 93 is
Since the sheet is not frictionally conveyed like a rubber roller, and the projection 931 is coupled to the sheet S and conveyed,
It can be said that the mutual pressing force between the roller 93 and the sheet S can be reduced, and the protrusion 931 pierces the sheet S, so that the roller 93 can be prevented from slipping on the sheet S. ing.

By the way, the shape of the projection 931 is
This affects the ease with which the sheet is pierced into the sheet and the ease with which the sheet is caught, and therefore affects the sheet conveyance accuracy. If the projection 931 is difficult to pierce the sheet S or is hardly caught, the projection 931 and the sheet S are less likely to be coupled, and the sheet conveyance accuracy and the like deteriorate accordingly. Therefore, it is preferable that the shape of the projection 931 be a shape that can be easily combined with the sheet S.

However, for example, Japanese Patent Application Laid-Open No.
As disclosed in Japanese Unexamined Patent Publication No. 32, since the projection 931 is formed by a method using etching, the shape of the projection is constant, and it is difficult to form the projection 931 into a convenient shape according to the transport target. Accordingly, the present invention is directed to a gripping rotating member such as a grip roller having a large number of minute projections formed on a surface thereof, the projection shape of which is easily pierced into a sheet or the like which is a predetermined conveyance target, or is easily caught, and a sheet or the like is used. It is an object of the present invention to provide a gripping rotating member having high transport accuracy and a method of manufacturing a gripping rotating member capable of easily forming a protruding shape into a sheet or the like or being easily caught.

Another object of the present invention is to provide a film-like grip member that can be used for manufacturing the grip rotation member, and a method of manufacturing the same.

[0013]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a film-like gripping member made of an electroformed film having a large number of minute predetermined projections formed on one surface, and a rotating member. For a grip having a core, and a film-like grip member formed of an electroformed film provided on an outer peripheral surface of the rotating member core and having a large number of minute predetermined projections formed on an outer surface. A rotating member is provided.

The film-like gripping member and the grip rotating member according to the present invention can be manufactured by these manufacturing methods according to the present invention using the electroforming method described later. The electroformed film refers to a film formed by an electroforming method. Examples of the material of such an electroformed film include a metal material that can be deposited by an electroforming method. Nickel, copper, chromium, iron, zinc, Ni-C
o-based alloy, Ni-Fe-based alloy, Cu-Ni-based alloy, Fe
-Ni-Cr-based alloy, Ni-SiC-based alloy and the like can be exemplified. Such a metal material is preferably, but not limited to, having an allowable stress of 23 kg / mm ² or less.
This is because when the projection is pierced into a sheet or the like and the sheet is conveyed or the like, flexibility (elasticity) is imparted to a load applied to the projection.

[0015] A brightener may be dispersed in such an electroformed film in order to improve the hardness of protrusions and the like. In this case,
The electroformed film is formed by electroforming so as to disperse the brightener together with the metal material as exemplified above.
Examples of such brighteners will be described later. Further, a lubricant may be dispersed in such an electroformed film in order to reduce the frictional resistance on the surface of the protrusion and to easily pierce the sheet or the like. Examples of the form of the lubricant include a particulate form. In this case, the electroformed film is deposited by an electroforming method so that the lubricant is dispersed together with the metal material exemplified above. Examples of such a lubricant will be described later.

A hard film may be formed on the outer surface of the projection to improve abrasion resistance or increase hardness. Examples of the material of the hard film include a nickel alloy such as a Ni-P alloy and a Ni-B alloy, and chromium. Such a hard film can be formed, for example, by plating. Further, on the outermost surface of the projection, a low friction resistance layer having a small friction resistance may be formed in order to reduce the friction resistance of the projection surface and to easily pierce a sheet or the like. Such a low friction resistance layer,
For example, it can be formed by fluorine dispersion plating, fluorine coating, silicon coating, or the like.

The film-like gripping member can be used as one component when manufacturing the gripping rotation member. Alternatively, if it is formed in an endless belt shape, it can be used alone for conveying a sheet such as paper. In any case, if the film-like gripping member is formed from the beginning (in other words, from the manufacturing stage) as a seamless endless belt, and the protrusions are formed on the outer surface thereof, the endless endless belt is formed. The step of forming a belt can be omitted.

In each of the film-like gripping member and the gripping rotation member according to the present invention, the protrusion formed on the surface has
For example, by piercing a sheet-like object such as paper or an OHP sheet and moving the surface, the sheet-like object can be moved in the surface moving direction. Examples of the shape of the projection include a conical shape, a pyramid shape, a truncated cone shape, a truncated pyramid shape, and a conide shape (so-called Mt. Fuji shape). The truncated cone refers to a shape obtained by removing a portion including a vertex from a cone. The same applies to the truncated pyramid. The shape of the protrusion is not limited to the above-mentioned one, but may be a shape having a higher degree of freedom by a manufacturing method using an electroforming method of the present invention, which will be described later, as compared with a manufacturing method using conventional etching. Can be. Such a protrusion is not limited to this, but for example, the diameter of the bottom portion is 80 to 200 μm.
m and a height of about 70 to 100 μm. The thickness of the film-like gripping member is not limited thereto, but may be, for example, about 60 to 150 μm.

The projections may be arranged in a predetermined pattern such as a grid pattern, a zigzag pattern or the like. Such protrusions are not limited to this, but may be arranged at a pitch of about 0.15 to 0.7 mm with respect to the moving direction of the sheet to be moved. The shape of the protrusion may be, for example, any of the following shapes. The protrusion has a truncated cone shape or a conide shape, and the diameter Du of the top surface and the diameter Db of the bottom surface are Db / 43 ≦ Du.
≦ Db / 3, and the height H of the projection
Is set to 0.04 mm ≦ H ≦ 0.2 mm, and the tip angle θ of the projection is set to 0 ° ≦ θ ≦ 45 °. The protrusion tip angle refers to an angle formed by two tangent lines at two positions in contact with the top surface of the protrusion on the protrusion slope when the protrusion is viewed in cross section. The tip angle of the projection becomes 0 ° when the two tangent lines are parallel. The top surface diameter Du and the bottom surface diameter Db are more preferably provided that Du = Db / 3. By doing so, as shown in the experimental results and the like described later, practically sufficient strength is obtained, and the projections are easily pierced into a sheet or the like. It said protrusion, protruding by supporting the pedestal with larger top surface the bottom surface of the raised, projecting a height H ₂ of the electromotive force, and a height H ₁ of the pedestal, the thickness of the sheet to be conveyed pierce the projections With respect to the length t, the relationship of H ₁ ≦ H ₂ ≦ t / 2 is satisfied. In this case, the projection does not break through the sheet to be conveyed. The projection is formed in a conide shape, and the ridge formed by the skirt portion has a shape in which a smooth concave curve is drawn. In this case, the radius R of the concave curve drawn by the ridge line and the height H of the projection are set so that the diameter Da of the bottom portion and the height H of the projection satisfy the relationship of 1.5H ≦ Da. , H / 3
It is preferable to satisfy the relationship of ≦ R. By doing so, the strength of the projection is improved, and when the projection is formed by a manufacturing method using an electroforming method described later, the projection is easily formed in such a shape.

The above-mentioned projections can be manufactured by a known etching technique or the like as long as the gripping rotation member has a large number of small projections made of a metal material of a predetermined form formed on the outer surface. The same can be said for the rotating member for grip. The present invention provides the following manufacturing method as a method for manufacturing the film-like grip member and the grip rotating member according to the present invention described above.

That is, a method for manufacturing a film-like grip member made of a metal material having a large number of small predetermined-shaped projections formed on one surface, wherein a large number of small predetermined-shaped concave portions are formed on an electroforming surface. A step of preparing the formed electroforming mold; a step of depositing the metal material in a film shape on the electroforming surface of the mold by an electroforming method; and a step of depositing the metal material on the electroforming surface of the mold. Separating the cast film from the mold to obtain a film-shaped grip member having the protrusions, and forming a large number of small protrusions of a predetermined shape on the outer surface. A method for preparing a rotating member for a grip, comprising the steps of: preparing a mold for electroforming in which a large number of minute concave portions having a predetermined shape are formed on the surface for electroforming; A step of depositing a metal material into a film by a casting method, and forming an electroformed film deposited on an electroforming surface of the mold. Separating the mold from the mold to obtain a film-like gripping member having the protrusions, and forming the film-like gripping member on the rotating member core body with the protrusions formed on one surface thereof facing outward. A method of manufacturing a rotating member for a grip including a step of covering.

In the method for manufacturing a film-like grip member according to the present invention, the film-like grip member is manufactured as follows. In the first step, an electroforming mold having a large number of minute concave portions formed on the electroforming surface is prepared.
The shape of the projection that fits into the recess of the predetermined shape on the electroforming surface is the shape of the projection finally formed. Therefore, the shape of the recess may be adjusted to the shape of the projection to be formed. The predetermined pattern formed by the recesses becomes the predetermined pattern formed by the projections finally formed. The recess can be formed on the electroforming surface of the electroforming mold by, for example, laser processing, plastic working such as embossing using a punch, blast processing, knurling, or other known methods. As a material for the electroforming mold, a conductive material is used, and examples thereof include copper, copper alloy, and stainless steel. The shape of the mold may be, for example, a column shape. In this case, the electroforming surface may include an outer peripheral surface thereof. Further, the mold is a hollow cylindrical mold that can be divided into two or more parts, and the cross-sectional shape of the hollow part of the mold is circular, and the electroforming surface is formed of the hollow part of the mold. It may be an inner peripheral surface. By doing so, the film-like gripping member obtained as described later has a seamless endless belt shape. In any case, in order to easily separate and separate the electroformed film deposited on the electroforming surface in a later step from the electroforming surface, the electroforming surface is chromium-plated, electroless. Nickel plating and WC sputtering may be performed.

In the next step, the metal material is deposited in the form of a film on the electroforming surface of the prepared electroforming mold by electroforming. In order to improve the hardness of the electroformed film to be deposited, the electroforming electrolytic solution used in this step may contain a brightener. Examples of such brighteners include sulfonic acid brighteners such as sodium saccharin and sodium naphthalene trisulfonate, and alcohol brighteners such as butynediol and butynethiol. When a brightener is included in the electrolytic solution for electroforming, the deposited electroformed film becomes a metal material in which the brightener is dispersed. Further, the electroforming electrolytic solution used in this step may contain a lubricant for reducing the frictional resistance of the surface of the formed projection.
Such a lubricant is preferably in the form of particles. Examples of such a lubricant include PTFE, MoS ₂ , and BN. When the lubricant is contained in the electrolytic solution for electroforming as described above, the electroformed film to be deposited becomes a metal material in which the lubricant is dispersed. When the metal material is deposited in a film shape by the electroforming method, various known methods may be applied.

Then, in the next step, the electroformed film deposited on the electroforming surface of the electroforming mold is separated from the mold. Thereby, a film-like grip made of an electroformed film in which a large number of protrusions of a predetermined form corresponding to the form of the concave portion on the minute electroforming surface are formed on one surface in contact with the electroforming surface. A member is obtained. As described above, the electroforming mold is a hollow cylindrical mold that can be divided into two or more, and the cross-sectional shape of the hollow part of the mold is circular, and the electroforming surface is When the inner peripheral surface of the hollow portion of the mold is used, the obtained film-like gripping member has a seamless endless belt shape. Mold 2
Since the above-mentioned division is possible, it can be easily separated from the electroforming surface.

A hard film may be formed on the surface of the film-like gripping member thus obtained in order to improve abrasion resistance and the like. Such a hard film can be formed by hard chrome plating, electroless nickel plating, or the like. Further, a low friction resistance layer having a low friction resistance may be formed on the outermost surface of the film-like gripping member thus obtained. Such a low friction resistance layer can be formed by, for example, fluorine dispersion plating, fluorine coating, silicon coating, or the like. When such a low frictional resistance layer is formed, the projections can easily penetrate into a sheet or the like.

As described above, the shape of the protrusion formed on one surface of the film-like gripping member corresponds to the shape of the recess formed on the electroforming surface of the electroforming mold. Therefore, in order to make the form of the protrusion from the above-mentioned form, the form of the concave portion on the electroforming surface may be a form corresponding to the above-mentioned. In order to set the shape of the projection to the above-described shape, the concave portion is formed in a conide shape, and the ridge formed by the base portion is shaped to draw a smooth concave curve. In this case, the diameter Da of the opening surface of the concave portion corresponding to the bottom surface portion of the protrusion and the depth H of the concave portion corresponding to the height of the protrusion satisfy the relationship of 1.5H ≦ Da, and the concave curve drawn by the ridge line It is preferable that the radius R and the depth H of the concave portion satisfy the relationship of H / 3 ≦ R. By doing so, the strength of the projections formed is improved, and in the step of depositing a metal material or the like on the electroforming surface, a defect such as deposition on only a part of the concave portion such as an edge portion is suppressed. As a result, it becomes easy to form a projection having a shape corresponding to the shape of the concave portion.

In the method for manufacturing a rotating member for a grip according to the present invention, a rotating member for a grip is manufactured as follows using the member for a film-like grip thus obtained. That is, the obtained film-like gripping member is placed on the rotating member core body with the protrusion formed on one surface thereof facing outward, so that a large number of minute predetermined-shaped protrusions are formed on the outer surface. The rotating member for grip described above is obtained. The film-like gripping member does not need to cover the entire rotating member core, but may cover only a part thereof.

When such a rotating member core is formed into a roller shape, for example, and a film-like grip member is put on its peripheral surface,
In a OA device such as a printer, a copying machine, a facsimile machine, and the like, a roller-shaped grip rotating member that can be preferably used for conveying a sheet such as a sheet of paper or an OHP sheet is obtained. As described above, in the case where the rotating member core is formed in a roller shape, when the film-like gripping member is in the shape of a strip, the film-like gripping member is wound around the peripheral surface of the core in a spiral shape, for example, to form a spot. It may be fixed to the core body by welding, or may be fixed by an adhesive.
In addition, if the film-like gripping member is formed in a seamless endless belt shape as described above, the film-like gripping member itself can be used as a gripping rotating member, and the film-like gripping member is provided inside the film-like gripping member. The roller-shaped gripping rotation member can be obtained simply by fixing it by spot welding or an adhesive through the roller-shaped rotation member core. Therefore, the step of spirally winding can be omitted.

[0029]

Embodiments of the present invention will be described below with reference to the drawings. First, basic steps in a method for manufacturing a film-like grip member and a grip rotation member according to the present invention will be described in order in the following first embodiment. (Example 1) (Basic manufacturing method) (A) Electroforming die preparation step In this step, a large number of minute concave portions having a predetermined form were formed on the electroforming surface used in the subsequent electroforming step. Prepare an electroforming mold.

In this example, first, a columnar member 1 having the form shown in FIG. 1A was prepared. The columnar member 1 is made of copper in this example, and has a diameter of 80 mm and a height of 160 mm. On the peripheral surface 11 of the columnar member 1, grooves 115 and 116 are formed over the entire circumference so as to divide the peripheral surface into three in the axial direction. 1
14 are formed. The depth of these grooves is 1 mm in this example. The peripheral surface 11 is divided into three belt-like surfaces 111, 112, and 113 by these grooves.
In the present embodiment, silicon is buried in the grooves 114, 115, and 116.

As a result, on the peripheral surface 11 of the columnar member 1, the surfaces 111, 112 and 113 are exposed as electric conductors (copper in this example), and the other grooves 114, 115 and 116 are provided. The part is a non-conductor (in this example,
Silicon) is exposed. It should be noted that no metal material is deposited on the non-conductive portion in a later electroforming step. In this example, a large number of concave portions 2 are formed on the surface 112 by stamping using the punch 31 having the shape shown in FIG.
1 was formed. The punch 31 has a tip portion 311 having a conical shape, whereby the concave portion 21 also has a conical shape. The punch 31 is made of a cemented carbide material (in this example, manufactured by Sumitomo Electric Industries, Ltd., trade name: ultra-fine powder) so as to withstand tens of thousands of times of stamping and to suppress wear due to such stamping. Alloy AF
1) and manufactured by grinding.
The tip of the punch 31 is sharp and the diameter is 0.0
It is about 1 to 0.02 mm. The concave portion 21 is, in this example,
They were formed in a zigzag pattern at a pitch of 0.5 mm, with an opening diameter of about 70 μm and a depth of about 70 μm.

Then, in the subsequent electroformed membrane separation step, the surface 11 is formed to facilitate separation of the electroformed membrane from the electroforming surface.
In this example, 1, 112 and 113 were plated with chrome. In this manner, the minute conical concave portion 21 is
12, a large number of columnar electroforming molds α1 were obtained.
In this example, the surface 112 is an electroforming surface. (B) Electroforming Step In the next step, a metal material is deposited in a film shape on the electroforming surface of the prepared electroforming mold by an electroforming method.

In this embodiment, the surface 112 of the electroforming mold α1 is
Nickel was deposited by electroforming as follows. That is, as shown in FIG. 3, the electroforming mold α1 is supported by a support member (not shown) and immersed in the electroforming electrolyte 51, and the In the example,
An electroforming process was performed by connecting to a DC power supply (not shown) such that nickel (made of nickel) became the anode. At this time, the mold α
The electrolytic solution 51 is appropriately pumped (not shown) so that pits (micro holes) are not formed in the nickel film deposited on the surface 112 by bubbles (in this example, bubbles made of hydrogen) attached to the surface of the first electrode 1. The flow of the flow velocity was made. The cathode mold α1 was rotated at 2 rpm or more so that the nickel film deposited on the surface 112 had a uniform thickness. The plate member 6 of the anode may be rotated around the mold α1 as the cathode, and both the cathode and the anode may be rotated as described above.

The electrolytic solution 51 for electroforming used in this example is composed of a stable composition containing nickel sulfamate 200-800 g / l boric acid 30-60 g / l and sodium lauryl sulfate as a pit inhibitor in this example. PH 3.0-5.
0 electrolyte solution. The electroforming was performed at a liquid temperature of 50 ° C. and a current density of 5 to 12 A / dm ² .

In this manner, the surface 11 of the electroforming mold α1
Nickel was deposited on the film 2 in a film form of about 70 μm. In addition, in the grooves 114, 115, and 116 on the peripheral surface 11 of the mold α1, silicon as a nonconductor is embedded,
Nickel does not precipitate because the silicon is exposed. (C) Separation Step In this step, the electroformed film deposited on the electroforming surface of the electroforming mold is separated from the mold.

In this embodiment, the mold α1 in which nickel is deposited on the surfaces 111, 112 and 113 in the form of a film is taken out from the electroforming electrolyte 51, washed with water, dried and then manually electroformed. The nickel film on the surface 112 serving as the application surface was peeled off. Since the deposited nickel film is cut by the non-conductive silicon embedded in the groove 114 crossing the surface 112, the nickel film can be easily peeled. Since chrome plating is performed on the surface 112 as described above, the nickel film can be easily peeled off by this as well. Nickel deposited on the surfaces 111 and 113 is not used anymore, and may be reused. Faces 111 and 11
Reference numeral 3 denotes a dummy surface provided so that nickel is deposited in a uniform thickness on the surface 112 which is an electroforming surface.

In this way, as shown in FIG. 4, one surface of the electroforming mold α1 which was in contact with the electroforming surface 112 was
The film-like gripping member 41 according to the present invention, which is made of nickel in which a large number of minute projections 411 are formed in a predetermined pattern, is obtained. In FIG. 4, for easy understanding,
The protrusion 411 is shown in large size. The same applies to FIG. 5, FIG. 6, FIG. 9, FIG. 10, and FIG. The film-like gripping member 41 has a substantially rectangular shape in this example. The shape of the protrusion 411 corresponds to the shape of the concave portion 21 on the surface 112, in other words, corresponds to the tip shape of the punch 31 used to form the concave portion 21, and is shown in FIG. It becomes such a conical shape. The protrusion 411 has a bottom surface diameter of about 70 μm and a height of about 70 μm according to the shape of the recess 21.
m.

As shown in FIG. 5, the film-like gripping member 41 can be used as a grip belt used for sheet conveyance and the like if the both ends are joined by welding so that the projection 411 faces outward. . In order to improve abrasion resistance, a hard film may be formed on the surface of the film-like gripping member 41 by electroless nickel plating or chrome plating. The surface hardness of the film-like gripping member 41 made of nickel when such a hard film is not formed is about 200 to 300 in Vickers hardness. The surface hardness of the film-shaped lip member 41 when such a hard film is formed is about 800 to 1,000.

Up to this point, the method of manufacturing the film-like gripping member according to the present invention has been described. The method of manufacturing the gripping rotary member according to the present invention is further provided by adding the following attaching step. (D) Attaching Step In the method for manufacturing a gripping rotating member according to the present invention, the film-shaped gripping member thus obtained is used, with the projection formed on one surface thereof facing outward. ,
The gripping rotation member is manufactured by covering the rotation member core.

In the present embodiment, the rotating member core is shown in FIG.
A hollow cylindrical iron pipe 7 shown in (A) was used. The outer diameter of the pipe 7 is 30 mm, the inner diameter is 24 mm, and the length is 40 m
m. The film-like gripping member 41 was cut into an appropriate size, spirally wound around the pipe 7, and fixed by laser spot welding. As a result, FIG.
A rotating member for grip according to the present invention shown in (B), here, a grip roller β1 was obtained. The grip roller β1 is
A film-like gripping member 41 having a large number of small conical projections 411 formed in a predetermined pattern on an outer surface is integrally provided on an outer peripheral surface of a pipe 7 which is a rotating member core.

The grip roller β1 is used for paper, OA equipment such as printers, copiers and facsimile machines.
It can be suitably used for conveying sheets such as HP sheets. For example, it can be used in place of the roller 92 shown in FIG. 24 or the roller 94 shown in FIG. For example, when the grip roller β1 is used instead of the roller 92 in FIG. 24, when the roller β1 is driven to rotate counterclockwise in FIG. 24, the protrusions 411 on the outer peripheral surface of the roller β1 pierce the sheet S one after another. The sheet S is conveyed to the left in the figure in a state where it is combined with and fitted to the protrusion 411.

Since the projection 411 formed on the outer peripheral surface of the grip roller β1 was formed by the manufacturing method according to the present invention, the diameter at the tip end could be reduced to about 0.01 mm (FIG. 7). (A)). Also,
The variation of the diameter at the tip of the projection 411 is ± 0.00
It was confirmed that it was about 3 mm. Conventionally, when a protrusion is formed on the outer peripheral surface of a roller by a method using etching, the diameter of the tip of the protrusion is 0.02 to 0.0.
Only about 04mm (see FIG. 7 (B))
In addition, it can be seen that the protrusions 411 formed by the manufacturing method according to the present invention are easier to stab and bite into a sheet or the like, as compared with the case where the diameters are varied.
That is, the grip roller β1 according to the present invention can transport the sheet with higher accuracy. (Experimental Example 1) Here, an experiment for examining the sheet conveying performance of the grip roller β1 of the present invention was performed, and the contents and results of the experiment will be described.

In this experiment, the roller β1 of the present invention is used instead of the roller 94 shown in FIG. 25, and the roller S1 is required to move the sheet S without slipping on the sheet S.
The contact pressure between the sheet S and the roller β1 was examined. Sheet S
Then, it was also examined whether or not the back of the sheet was stained by using copied paper having one side already copied.

As a comparative example, a conventionally used rubber roller whose surface layer is a rubber is used as the roller 94.
An experiment similar to the above was performed. The size of the rubber roller was the same as that of the roller β1. The experimental results are shown in Table 1 below. Table 1 Roller β1 Rubber roller Required contact pressure Small Large Sheet back dirt No Yes From these results, it can be seen that the contact pressure required for sheet conveyance between roller β1 and the sheet is smaller than that of the conventional rubber roller. Therefore, no back stain on the sheet occurs. (Example 2) (Seamless endless belt-shaped film-like gripping member) Next, a method of manufacturing a seamless endless belt-like film-like gripping member according to the present invention will be described. When manufacturing the film-shaped grip member having such a shape, the cross-sectional shape of the hollow portion is circular instead of the mold α1 shown in FIG. 1B prepared in the electroforming mold preparation step of the first embodiment. A hollow cylindrical mold that can be divided into two or more is prepared. The electroforming surface is the inner peripheral surface of the hollow portion.

In this example, a copper electroforming mold α2 shown in FIG. 8A was prepared. The mold α2 has a cylindrical shape having a hollow portion 121 having a circular cross section, and is formed by joining four mold pieces 122 with bolts b and nuts n. Therefore, the mold α2 can be divided into four. Each mold piece 122
Has an arc-shaped cross section with a central angle of 90 °, and has a protruding portion 1221 that protrudes outward in the radial direction when assembled in order to join the four mold pieces 122 with bolts b or the like. The protrusion 1221 is provided with a hole 1222 for passing the bolt b. On the inner peripheral surface 1223 of each mold piece 122, a large number of minute conical concave portions 21 are formed. The concave portion 21 was formed by plastic working by stamping using a punch 31 shown in FIG. 2A before assembling each mold piece 122. In a later electroformed film separation step, the surface 1223 on which the concave portion 21 was formed was chromium-plated to facilitate separation of the electroformed film from the electroformed surface 1223. Such a surface 1223 is a surface for electroforming of the mold α2.

Next, nickel was deposited on the electroforming surface 1223 of the prepared electroforming mold α2 by electroforming. The electroforming conditions and the composition of the electroforming electrolyte were the same as those shown in Example 1. In this example, a nickel screw-shaped member was used as the anode, and the anode was located at the center of the hollow portion 121 of the mold α2 when immersed in the electrolytic solution.

The electroformed nickel film thus deposited is
The mold α2 was divided and separated from the mold to obtain a film-like gripping member 42 shown in FIG. Membrane grip member 42
Since it was manufactured as described above, it had a seamless (seamless) endless belt shape, and a large number of small conical protrusions 421 were formed in a predetermined pattern on the outer peripheral surface. In order to improve abrasion resistance, a hard film may be formed on the outer peripheral surface of the film-like gripping member 42 where the projection 421 exists.

The film-like grip member 42 can be used as it is as a grip belt for sheet conveyance.
Compared to the grip belt shown in FIG. 5, the cost can be reduced because the joining step is unnecessary. Further, as shown in FIG. 10, if a roller-shaped rotating member core 72 is passed through the inner peripheral surface of the film-like gripping member 42 and fixed by shrink fitting or bonding, it can be used as a grip roller. . Also in this case, compared to the grip roller shown in FIG. 6 (B), the cost for the step of spirally winding the film-like gripping member around the core 71 or joining the seam (joint) is not required. Can be lowered. In any case, since there is no seam portion where no projection is formed, there is no problem that the grip force is reduced at the seam portion. (Example 3) (Improvement of Hardness) Next, a method of improving the hardness of the electroformed film itself deposited on the electroforming mold by the electroforming method as described above will be described.

As described above, the surface of the electroformed film deposited on the electroforming surface of the mold by the electroforming method is subjected to hard chromium plating or the like to form a hard film, thereby reducing the surface hardness. And thereby the abrasion resistance and the like can be improved. However, if the metal deposited on the electroforming mold by the electroforming method is a soft metal, the following problems may occur. For example, as described in the above embodiment, a hard film is formed on an electroformed nickel film produced by depositing soft nickel having a Vickers hardness of about 200, and a film-like gripping member or a grip rotating member such as a grip roller. When used as a projection, although the surface of the projection is covered with a hard film and is hard, but the inside is soft nickel, when a force is applied to the projection by sheet conveyance or the like, the projection is elastically deformed and the like is repeated. The hard film on the surface of the projection may crack or the projection itself may be broken.

The hardness of the electroformed film (film-like gripping member) itself deposited by the electroforming method can be improved as follows. Such an electroformed film (membrane grip member)
Can be manufactured in the same steps as (A) to (C) shown in Embodiment 1. However, the electrolytic solution for electroforming used in the electroforming step contains a brightener. The mold shown in FIG. 8 may be employed.

In this example, the electrolytic solution for electroforming includes nickel sulfamate 200 to 800 g / l boric acid 30 to 60 g / l and a saccharin sodium 300 ppm or more as a brightener. An electrolyte was used. The electroforming conditions are as follows: the liquid temperature is 50 to 60 ° C.
The current density was set to 4 to 10 A / dm ² .

The obtained electroformed nickel film had a Vickers hardness of about 500. By a simple method such as adding a brightener to the electrolytic solution for electroforming, it was possible to significantly improve the hardness from about Vickers hardness 200 when no brightener was added. Here, the relationship between the Vickers hardness of the obtained electroformed nickel film and the concentration of saccharin sodium as a brightener is shown in FIG. FIG. 11 shows that the hardness can be adjusted by adjusting the concentration of the brightener in the electrolytic solution. The electroformed film thus obtained preferably has a Vickers hardness of about 500 or more. A hard film (Vickers hardness of about 1000 or more) may be further formed on the surface of the obtained electroformed nickel film. The obtained electroformed nickel film can be used as it is as a film-like gripping member, for example, as a grip belt as shown in FIG. Also, as shown in FIG. 6 (B), when it is joined to a rotating member core, it can be used as a grip roller.

It is considered that the hardness of the deposited electroformed film is increased by including a brightener in the electroforming electrolyte for the following reasons. Metals form crystals in a solid state, and atoms are regularly arranged in three dimensions. It is said that most of metals deposited from an electrolytic solution by electroforming or plating have a crystal lattice structure of face-centered cubic, body-centered cubic, or dense hexagonal.

When nickel is deposited as described in the above embodiment, it becomes a face-centered cubic lattice structure, and has a preferential orientation arrangement (orientation) peculiar to the electrodeposited metal as shown in FIG. When a brightener is added to the electrolytic solution for electroforming, an internal stress consisting of macroscopic stress and microscopic stress is generated inside the electrodeposited metal. The macroscopic stress refers to a compressive stress or a tensile stress which is a phenomenon peculiar to electroforming or plating as shown in FIG.
Microscopic stress refers to non-uniform stress in a crystal grain, a grain boundary portion, or the like. The microscopic stress is a compressive stress or a tensile stress depending on the location, and the direction is not uniform. The origin is the dislocation, the distortion of the crystal lattice caused by the eutectoid (S contained in the brightener), and the stress field at the crystal grain boundaries. These stresses result in an increase in hardness. Therefore, the reason why the brightener is added to the electrolytic solution for electroforming is to utilize such microscopic stress. Example 4 (Improvement of Friction Resistance of Projection Surface) As described above, the film-like gripping member and the grip rotation member according to the present invention pierce the projections formed on the surface thereof into a sheet or the like, and The sheet or the like is moved by being combined with the sheet or the like. Therefore, the more easily the projections pierce the sheet or the like, the better the sheet and the like can be conveyed. One factor related to the ease with which the projections pierce the sheet or the like is the frictional resistance of the projection surface. If the frictional resistance of the projection surface is small,
As a result, the protrusions can be easily pierced into a sheet or the like.

Therefore, a method for reducing the frictional resistance of the projection surface will be described below. Also when producing a film-like gripping member or a gripping rotation member having a small frictional resistance on the surface of the projection, basically, (A) to (A) shown in Example 1 are used.
(C) (In the case of manufacturing a gripping rotating member, it can be further manufactured in the same step as (D) step). Further, a mold shown in FIG. 8 can be used. However, the electroforming electrolyte used in the electroforming step contains a lubricant.

In this example, the electrolyte for electroforming has a stable composition having a pH of 3.0 g / L, comprising 300 g / L of nickel sulfamate / 80 g / L of particulate PTFE (average particle diameter: 0.1 to 1 μm). An electrolyte of 8-4.5 was used. The electroforming was performed at a liquid temperature of 50 ° C. and a current density of 2 A / dm ² .

As described above, by including PTFE (polytetrafluoroethylene) having self-lubricating properties in the electroforming electrolyte, the electroformed film having projections on the surface of the mold is formed of nickel material. Particle PTFE is dispersed therein. Hereinafter, such an electroformed film is referred to as an electroformed Ni / P
It is called TFE film. Due to the lubricity of the PTFE material, the coefficient of friction of the electroformed nickel film is about 0.2, while the electroformed Ni / PT
The friction coefficient of the FE film becomes about 0.1 or less. Therefore, the frictional resistance of the electroformed film and, consequently, the surface of the protrusion formed on the surface of the electroformed film can be reduced by a simple method of only including the particulate PTFE in the electrolytic solution for electroforming.

Instead of including the particulate lubricant in the electrolytic solution for electroforming, the surface of the electroformed nickel film having the protrusions is plated with a fluorine-dispersed material or coated with fluorine or silicon. Alternatively, the frictional resistance of the projection surface may be reduced. (Experimental Example 2) Here, the electroformed N produced as described above was used.
A grip roller was manufactured using the i / PTFE film, and an experiment was conducted to examine the sheet conveyance performance of the grip roller. The contents and results of the experiment are shown.

In this experiment, a grip roller using an electroformed Ni / PTFE film was used in place of the roller 92 shown in FIG. It is a thing. At this time,
The pressing force of the pinch roller 91 against the grip roller is 3
I went in different stages. As a comparative example, a similar experiment was performed using a grip roller using an electroformed Ni film (a film in which only nickel was deposited) instead of the roller 92. The protrusion shape was the same as that of the grip roller using the electroformed Ni / PTFE film.

The experimental results are shown in Table 2 below. In Table 2,
“◎” indicates that the sheet shift amount after conveyance was within 10 μm, and “○” indicates that the sheet shift amount after conveyance was 10 μm.
It indicates that the deviation of the sheet after conveyance was larger than 30 μm and 50 μm.
It was within. Table 2 Pinch roller pressure (unit: kg) Electroformed film material Transport accuracy 14 Ni ◎ 14 Ni / PTFE ◎ 12 Ni ○ 12 Ni / PTFE ◎ 10 Ni △ 10 Ni / PTFE ◎ From Table 2, electroformed Ni / PTFE film It can be seen that the grip roller using the PIP has better transport accuracy than the grip roller using the electroformed Ni film. Therefore, it can be seen that the smaller the frictional resistance of the projection surface and the easier the projection is to pierce the sheet, the better the transport accuracy. Further, the pinch roller pressure required to obtain the same conveyance accuracy is the electroformed Ni / P
It can be seen that the grip roller using the TFE film may be smaller than the grip roller using the electroformed Ni film. Example 5 (Preferred Example 1 of Protrusion Shape) In the above description, the shape of the protrusion formed on the surface of the film-like gripping member or the gripping rotating member has a conical shape shown in FIG. (Strictly speaking, the diameter is 0.01mm ~
Although it has a top surface of about 0.02 mm, it has a truncated cone shape. However, the shape of the protrusion is not limited to this, and various shapes can be obtained by the manufacturing method according to the present invention. According to the conventional method using etching, the projection shape can be formed almost only in a conide shape (so-called Mt. Fuji shape). However, according to the manufacturing method according to the present invention, the projection shape on the electroforming surface of the electroforming mold is reduced. By selecting the shape of the concave portion to be formed in FIG. 14A, for example, in addition to the conide shape shown in FIG. 14A, the protrusion shape is a pyramid shape (a quadrangular pyramid shape in the illustrated example) shown in FIG. 14 (C), FIG.
It can be formed in a truncated pyramid shape shown in (D) (a truncated pyramid shape in the illustrated example). When manufacturing a projection having such a shape, the shape of the recess formed on the electroforming surface of the mold may be adjusted to the shape of the projection. For example, when the recess is formed by plastic working by stamping using a punch, May be adjusted to the shape of the protrusion.

By the way, the shape of the projection affects the ease with which a sheet or the like is pierced, and consequently affects the conveying performance of the sheet or the like. Further, a force may be applied to the protrusion in a lateral direction (a direction crossing the protruding direction) with respect to the protruding direction, and depending on the shape of the protrusion, the protrusion may be broken from the root. For example, in the sublimation type thermal transfer printer shown in FIG. 15, when a grip roller having a large number of minute projections formed on the outer peripheral surface is used as follows, a load is applied to the projections. FIG. 15 is a schematic configuration diagram of such a printer. This printer includes a thermal head TH and an ink ribbon R for forming an image on a sheet based on document image data sent from a host device such as a computer. A roller 952 rotatably supported at a fixed position is disposed at a position facing the thermal head TH with the ink ribbon R interposed therebetween. The thermal head TH is driven by a roller 95 with a predetermined force F.
2 is pressed. Further, in order to convey the sheet S passing between the thermal head TH and the roller 952 in the right direction in the figure, the sheet S is pressed against the grip roller 953 having a large number of minute projections 9531 formed on the outer peripheral surface and the roller 953. A pinch roller 951 is provided. Grip roller 9
When the sheet 53 is rotated clockwise in the drawing, the sheet S can be conveyed rightward in the drawing. At this time, a force of about f = μF is applied to the protrusion 9531 of the grip roller 953 in the horizontal direction in the drawing. Here, μ is a coefficient of friction between the sheet S and the ink ribbon R. In such a case, if the strength of the projection is not sufficient, the projection may be broken from the root. Therefore, the shape of the projection is desirably a shape that can withstand the load applied to the projection.

When a stress is applied to a portion of the projection when a force is applied to the projection, the projection is likely to break at that portion. Therefore, when the stress generated in the projection by the applied force is uniform. In addition, it can be considered that they have the most excellent strength resistance characteristics. And the following was found. That is, the projection shape is as shown in FIG.
16 (C) and (D).
When the diameter of the top part is Du and the diameter of the bottom part is Db, the approximate model of "equal strength beam" and the formula of "equal strength beam" are used. hand,
Also, it was found that Du ≦ Db / 3 is preferable, considering that the flared portion is more excellent in strength.

Using a sublimation-type printer as shown in FIG. 15, the amount of protrusion pierced into paper (sheet) was measured to be 0.04 mm, so that the height H of the protrusion was 0.1 mm.
It has been found that it is preferable that the relation of 04 mm ≦ H is satisfied. Further, since the thickness of the paper (image receiving paper) used in the sublimation type printer as shown in FIG. 15 is about 0.2 mm, the height H of the projection is required to prevent the projection from penetrating the paper.
It was found that it was preferable that H ≦ 0.2 mm.

FIG. 17 is a graph showing the relationship between the diameter of the tip of the projection (the diameter of the top surface of the projection) and the paper conveyance performance. This graph shows that when the paper is transported using the grip roller having the protrusion according to the present invention instead of the roller 92 shown in FIG. 24, the pinch roller 91 in which the deviation amount of the transported paper becomes zero.
It shows the minimum pressure. The smaller the minimum pressure, the better the transfer performance. Such a pressure is preferably about 12 kg or less. As shown in FIG.
If it exceeds μm, it can be seen that the penetrability to paper is deteriorated and the transport performance is deteriorated. Therefore, it was found that the diameter of the protrusion tip is preferably about 30 μm or less.

In the case of a conide-shaped projection as shown in FIG. 18, when the height H is 0.2 mm and θ = 0 °, the diameter of the top surface is set to the above 0.03 mm from the viewpoint of easy penetration into paper. Then, the diameter Db of the bottom portion is Db = 0.2 + 0.03 +
0.2 becomes about 0.43 mm. On the other hand, the tip diameter Du
When Du <0.01 mm, it is very easy for the tip to be broken, and therefore Du ≧ 0.01 mm is preferable. From these, it was found that Db / 43 ≦ Du was preferable. (Experimental example 3) The tip angle θ of the projection affects the ease of piercing into a sheet or the like and, consequently, the conveying performance of the sheet or the like.

Then, an experiment for examining the relationship between the protrusion tip angle θ and the sheet conveying performance was performed, and the contents and results of the experiment are shown. In this experiment, instead of the roller 92 shown in FIG. 24, a grip roller manufactured in the same manner as in Example 1 was used to examine the sheet conveyance accuracy. The transfer accuracy was determined by examining the same thing as in Experimental Example 2. Nickel was used as a projection material (membrane-like grip member material) of the grip roller. The shape of a large number of protrusions formed on the outer peripheral surface of the grip roller is shown in FIG.
And a truncated cone as shown in FIG. The height H of the projection is 0.1 mm, and the diameter Du of the top surface is 0.025.
mm. The pitch at which the protrusions were formed on the roller surface was 0.5 mm. The tip angle θ is 25 °, 40 °,
45 ° and three different types were prepared. Further, the pressing force of the pinch roller 91 against the grip roller was changed in three stages.

The experimental results are shown in Table 3 below. In Table 3,
“◎” indicates that the sheet shift amount after conveyance was within 10 μm, and “○” indicates that the sheet shift amount after conveyance was 10 μm.
Larger indicates that it was within 30 μm, “△” indicates that the sheet deviation after conveyance was larger than 30 μm and was within 50 μm, and “×” indicates that the sheet deviation after conveyance was larger than 80 μm. Is shown. Table 3 Pinch roller pressure (unit: kg) Tip angle θ Transfer accuracy 14 45 ° ◎ 14 40 ° ◎ 14 25 ° ◎ 12 45 ° △ 12 40 ° ○ 12 25 ° ◎ 10 45 ° × 10 40 ° ○ 10 25 °よ り From Table 3, it can be seen that the smaller the protrusion tip angle θ, the easier it is to pierce a sheet or the like. The tip angle θ is θ ≦ 45 °, more preferably θ ≦ 40 °, in view of the ease of piercing the sheet.

Therefore, in the case where the shape of the projection is a truncated cone or conide as shown in FIG. 16, in order to provide both the strength and the ease of piercing a sheet or the like, Db
/ 43 ≦ Du ≦ Db / 3 and 0.04 mm ≦ H ≦ 0.
It is understood that the relationship of 2 mm and 0 ° ≦ θ ≦ 45 ° should be satisfied.

In the case where projections are formed on the outer peripheral surface of a grip roller or the like by a conventionally known method using, for example, etching, if the above-mentioned relationship is satisfied, the projections have strength and sheet or the like. It will be easy to pierce into. Embodiment 6 (Example 2 of Preferred Projection Shape) When the grip roller according to the present invention is used for unloading a sheet from a sheet cassette 97 storing a plurality of sheets as shown in FIG. In some cases, the projections may break through the sheet that the roller contacts, pierce the sheet below the sheet, and convey two sheets. Therefore, it is desirable that the shape of the protrusion does not break through the sheet that the roller contacts.

FIG. 19 shows an example of such a projection shape.
Such projections 43 is composed of height as the protrusion 432 of the H _2, frustoconical height H ₁ of the base 431 and having a larger top surface protrusion of the bottom surface. The height of H ₂ projections 432, the the height H ₁ of the base 431, of the sheet to be conveyed pierce the protrusion portion 432 with respect to the thickness _{t, H 1 ≦ H 2 ≦} t /
There is a relationship of 2. Thereby, when the sheet S is carried out from the sheet cassette in which a plurality of sheets S are stacked and stored as shown in FIG. 25, as shown in FIG.
32 pierces only the sheet S to be conveyed, and does not pierce the sheet S adjacent to the sheet S to be conveyed.
In addition, since the pedestal 431 is provided, the protrusion 432 is provided.
And the overall strength of the pedestal 431 is improved. further,
Even when the projection 432 is damaged, the damaged portion is
Since the surface is concentrated on the 31 surface, the damaged surface becomes flat and the back surface of the sheet can be prevented from being damaged.

The shape of the projection 431 is not limited to the conical shape shown in FIG. 19, and may be a truncated cone, a pyramid, a truncated pyramid, or a conide. The projection having a pedestal as shown in FIG. 19 was formed as follows in this example. That is, first, a half cutter having a shape as shown in FIG. 21 is attached to a milling cutter rotatable at 10,000 rotations or more, and truncated conical recesses are formed at regular intervals of 0.02 to 0.1 mm for electroforming. Formed on the surface. Next, a concave portion having a shape corresponding to the projection 43 was formed at the center position of the formed concave portion by stamping using a punch having a tip shape as shown in FIG. Other steps were the same as in Example 1. (Embodiment 7) (Preferred Example 3 of Protrusion) As described above, in the method for producing a film-like gripping member and the method for producing a gripping rotation member according to the present invention, the projection on the surface is formed by electroforming gold It is formed by depositing a metal material or the like by electroforming in a concave portion provided on the electroforming surface of the mold.

However, when a metal material or the like is deposited on the electroforming surface of the mold by the electroforming method, the metal material or the like is intensively deposited on an edge portion where the lines of electric force are concentrated. For example, as shown in FIG. 22, when the concave portion 22 formed in the electroforming surface 13 is a quadrangular prism having an edge, it is immersed in an electroforming electrolytic solution for electroforming, and the electrolytic voltage is increased. Also, as shown in the figure, there is a case where the particles are concentrated on the surface portion of the edge 131 in the opening and hardly deposited on the surface of the bottom 132 of the concave portion.

Therefore, in order to form the projections by the electroforming method, it is preferable that the shape of the concave portion formed on the electroforming surface of the mold has as few edge portions as possible. In particular, it is preferable that the opening of the concave portion has no edge portion. As such a concave shape, for example, a concave shape as shown in FIG. 23 can be mentioned. The concave portion 23 in FIG. 23 has a conide shape (Mt. Fuji shape) formed on the electroforming surface 14 of the mold, and the ridge formed by the base portion 233 has a smooth concave curve. That is, the opening surface 23 of the concave portion 23
One part has no edges. (Experimental Example 5) Here, when the electroforming process was performed on a mold electroforming surface having a conide-shaped recess as shown in FIG. 23, the depth H of the recess and the diameter Da of the opening surface were measured. An experiment was conducted to examine the relationship between the radius R of the curve drawn by the ridge line formed by the base portion and the penetration of the precipitate into the concave portion. The experimental results are shown in Table 4 below.

In Table 4, “◎” indicates that the shape of the concave portion of the mold was transferred by 95% or more after electroforming, and “○” indicates 8
5% or more and less than 95% were transferred.
5% or more and less than 85% were transferred.
This indicates that less than 5% was transferred. Table 4 Depth H Curve radius R Opening diameter Da Penetration (mm) (mm) (mm) 0.1 0.01 0.15 × 0.1 0.03 0.15 △ 0.1 0.05 0.0 15 0.1 0.17 0.15 0.1 0.1 0.15 0.1 0.1 0.1 x 0.1 0.03 0.1 x 0.1 0.05 0. 1 × 0.10.070.1 × 0.10.10.1 × From Table 4, from the viewpoint of the penetration of the electroformed precipitate into the recess, 1.5H ≦ Da and H It is understood that it is preferable to satisfy the relationship of / 3 ≦ R. More preferably, 1.5H ≦ Da and H / 2 ≦ R.

When the shape of the concave portion formed on the electroforming surface of the mold satisfies such a relationship, the shape of the concave portion substantially matches the shape of the projection formed in the concave portion by the electroforming process. be able to. In addition, the ridge line other than the skirt portion of the concave portion may be a curved line or a straight line.

[0076]

According to the present invention, there is provided a gripping rotating member such as a grip roller having a large number of fine projections formed on its surface, the projection shape of which is easily pierced into a sheet or the like to be conveyed, or Easy to get caught,
It is possible to provide a method for manufacturing a rotating member for a grip with good conveyance accuracy of a sheet or the like, and a rotating member for a grip capable of easily forming a projection into a sheet or the like or being easily caught.

Further, the present invention can provide a film-like grip member which can be used for manufacturing the grip rotating member, and a method of manufacturing the same.

[Brief description of the drawings]

FIG. 1A is a schematic perspective view of a columnar member, and FIG.
FIG. 1 is a schematic perspective view of an example of an electroforming mold.

FIG. 2A is a schematic perspective view of an example of a punch that can be used when producing an electroforming mold, and FIG. 2B is a schematic perspective view of an example of a projection.

FIG. 3 is a schematic view showing a state in which an electroforming process is being performed.

FIG. 4 is a schematic perspective view of an example of a film-like grip member according to the present invention.

FIG. 5 is a schematic perspective view of a film-shaped grip member spirally wound into an endless belt shape.

FIG. 6A is a schematic perspective view of an example of a rotating member core,
FIG. (B) is a schematic perspective view of a grip roller as an example of a grip rotating member according to the present invention.

FIG. 7A is a schematic cross-sectional view showing a state of a diameter of a projection top surface manufactured by a manufacturing method of the present invention, and FIG. 7B is a schematic view of a projection top surface manufactured by a conventional manufacturing method. It is a schematic sectional drawing which shows a mode of a diameter.

FIG. 8 is a schematic perspective view of another example of an electroforming mold.

9 is a schematic perspective view of a film-shaped grip member manufactured by using the electroforming mold shown in FIG.

FIG. 10 is a schematic perspective view of another example of the grip rotating member according to the present invention.

FIG. 11 is a graph showing the relationship between the concentration of saccharin sodium in an electrolytic solution for electroforming and the Vickers hardness of a deposited nickel film.

FIG. 12 is a schematic diagram showing a crystal lattice structure of nickel deposited by an electroforming method.

FIG. 13A is a diagram for explaining compressive stress, and FIG. 13B is a diagram for explaining tensile stress.

14A is a schematic perspective view showing another example of the projection shape, FIG. 14B is a schematic perspective view showing another example of the projection shape, and FIG. 14C is still another example of the projection shape. FIG. 4D is a schematic perspective view showing another example of the projection shape.

FIG. 15 is a schematic configuration diagram of an example of a sublimation type thermal transfer printer.

16A is a schematic perspective view for explaining the shape of a truncated conical projection, FIG. 16B is a schematic sectional view of the projection of FIG. 16A, and FIG. 16C is the shape of a conide-shaped projection. And FIG. (D) is a schematic sectional view of the projection of FIG. (C).

FIG. 17 is a diagram illustrating a relationship between a protrusion tip diameter and paper conveyance performance.

FIG. 18 is a schematic sectional view of a conide-like projection.

FIG. 19 is a schematic perspective view showing still another example of a projection shape.

FIG. 20 is a view showing a state in which a protrusion having the shape shown in FIG. 19 is pierced into a sheet.

FIG. 21 is a schematic perspective view of an example of a half cutter that can be used when forming a projection having the shape shown in FIG. 19;

FIG. 22 is a schematic cross-sectional view showing a deposit state of a precipitate deposited in a concave portion of an electroforming mold by an electroforming method.

FIG. 23 is a schematic sectional view for explaining the shape of a concave portion of the electroforming mold.

FIG. 24 is a schematic cross-sectional view showing how a sheet is conveyed by a pair of rollers.

FIG. 25 is a schematic cross-sectional view showing how a sheet is carried out from a sheet tray.

FIG. 26 is a schematic cross-sectional view of a roller provided with a protrusion on an outer peripheral surface.

[Explanation of symbols]

 α1, α2 Electroforming mold β1 Grip roller (Rotating member for grip) 1 Columnar member 112, 1223, 13, 14 Electroforming surface 21 Depression 31 Punch 411, 421, 9531, 931 Projection 51 Electrolytic solution for electroforming 7 pipe (rotating member core) 72 rotating member core

Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI // C25D 3/12 102 C25D 3/12 102 15/02 15/02 H

Claims (42)

[Claims] 1. A film-like gripping member made of an electroformed film having a large number of minute projections of a predetermined shape formed on one surface. 2. A film-like gripping member according to claim 1, wherein a brightener is dispersed in said electroformed film. 3. The member for a film-like grip according to claim 1, wherein a lubricant is dispersed in the electroformed film. 4. A low friction resistance layer having a low friction resistance is formed on the outermost surface of said projection.
A member for a film-like grip according to the above. 5. The film-like gripping member according to claim 1, wherein the member has a seamless endless belt shape, and the projection is formed on an outer surface. 6. The projection has a truncated cone shape or a conide shape, and the diameter Du of the top surface and the diameter Db of the bottom surface satisfy the relationship of Db / 43 ≦ Du ≦ Db / 3. The member for a film-like grip according to any one of claims 1 to 5, wherein the length H satisfies 0.04 mm ≤ H ≤ 0.2 mm, and the tip angle θ of the projection satisfies 0 ° ≤ θ ≤ 45 °. Wherein said projection is supported by a pedestal having a projecting larger top surface than the bottom surface of the electromotive force, the protrusion height H _2,
The height H ₁ of the pedestal, the thickness t of the sheet to be conveyed pierce the projections, one of _{H 1 ≦ H 2 ≦ t /} 2 of which satisfies the relationship claims 1 to 5 The member for a film-like grip described in the above item. 8. The projection according to claim 1, wherein the projection has a conide shape, and a ridge formed by a base of the projection has a smooth concave curve.
6. The film-like gripping member according to any one of items 1 to 5. 9. The diameter Da of the bottom surface of the projection and the height H of the projection satisfy a relationship of 1.5H ≦ Da, and the radius R of a concave curve drawn by the ridge and the height of the projection 9. The film-like gripping member according to claim 8, wherein H satisfies a relationship of H / 3 ≦ R. 10. A film-shaped grip made of a rotating member core, and an electroformed film provided on an outer peripheral surface of the rotating member core and having a large number of small projections formed on an outer surface thereof. And a rotating member for grip having a gripping member. 11. The gripping rotating member according to claim 10, wherein a brightener is dispersed in the electroformed film. 12. The gripping rotating member according to claim 10, wherein a lubricant is dispersed in the electroformed film. 13. The gripping rotating member according to claim 10, wherein a low frictional resistance layer having a small frictional resistance is formed on an outermost surface of said projection. 14. The gripping rotation member according to claim 10, wherein the film-like gripping member has a seamless endless belt shape, and the projection is formed on an outer surface. 15. The projection has a truncated cone shape or a conide shape, and the diameter Du of the top surface and the diameter Db of the bottom surface satisfy the relationship of Db / 43 ≦ Du ≦ Db / 3, and the height of the projection is 15. The gripping rotation member according to claim 10, wherein the length H satisfies 0.04 mm ≦ H ≦ 0.2 mm, and the tip angle θ of the projection satisfies 0 ° ≦ θ ≦ 45 °. 16. The projection is supported on a pedestal having a top surface that is larger than the bottom surface of the projection, and has a height H of the projection.
_2, the height H ₁ of the pedestal, the thickness t of the sheet to be conveyed pierce the projections, claims 10 satisfy the relationship of _{H 1 ≦ H 2 ≦ t /} 2 14 The rotating member for grip according to any one of the above. 17. The gripping rotation member according to claim 10, wherein the projection has a conide shape, and a ridge formed by a base portion of the projection has a smooth concave curve. 18. The diameter Da of the bottom surface of the projection and the height H of the projection satisfy a relationship of 1.5H ≦ Da, and the radius R of a concave curve drawn by the ridge and the height of the projection 18. The gripping rotation member according to claim 17, wherein H satisfies a relationship of H / 3 ≦ R. 19. A gripping rotating member having a large number of small protrusions made of a metal material having a predetermined shape formed on an outer surface, wherein the protrusions have a truncated cone shape or a conide shape, and a diameter of a top surface thereof. Du and the diameter Db of the bottom surface satisfy the relationship of Db / 43 ≦ Du ≦ Db / 3, the height H of the projection is 0.04 mm ≦ H ≦ 0.2 mm, and the tip angle θ of the projection Is a rotating member for grips, wherein 0 ° ≦ θ ≦ 45 °. 20. A gripping rotating member having a large number of small projections made of a metal material of a predetermined shape formed on an outer surface thereof, wherein the projections are supported on a pedestal having a top surface larger than the bottom surface of the projections. The height H ₂ of the projection and the height H ₁ of the pedestal are such that H ₁ ≦ H ₂ ≦ t / 2 with respect to the thickness t of the sheet to be conveyed by piercing the projection. A rotating member for a grip, which satisfies the relationship. 21. A gripping rotating member having a large number of small protrusions made of a metal material of a predetermined form formed on an outer surface thereof, wherein the protrusions have a conide shape, and a ridgeline formed by a base portion thereof is smooth. A rotating member for a grip, wherein the rotating member has a concave curve. 22. The diameter Da of the bottom surface of the projection and the height H of the projection satisfy a relationship of 1.5H ≦ Da, the radius R of a concave curve drawn by the ridge line and the height of the projection. 22. The grip rotating member according to claim 21, wherein H satisfies a relationship of H / 3 ≦ R. 23. A method of manufacturing a film-like gripping member made of a metal material having a large number of small predetermined-shaped projections formed on one surface, comprising a plurality of small predetermined-shaped concave portions formed on an electroforming surface. A step of preparing the formed electroforming mold; a step of depositing the metal material in a film form on the electroforming surface of the mold by an electroforming method; Separating the cast film from the mold to obtain a film-like gripping member having the projections. 24. The method according to claim 23, wherein the mold is a cylindrical mold, and the electroforming surface is an outer peripheral surface of the mold. 25. The mold according to claim 25, wherein the mold is a hollow cylindrical mold that can be divided into two or more. The cross section of the hollow portion of the mold is circular, and the electroforming surface is The method for manufacturing a member for a film-like grip according to claim 23, wherein the member is an inner peripheral surface of a hollow portion of a mold. 26. An electroforming electrolytic solution used in a step of depositing the metal material in a film form on the electroforming surface of the mold by electroforming to improve the hardness of the electroformed film. The method for producing a film-like grip member according to any one of claims 23 to 25, comprising a brightener. 27. The electrolytic solution for electroforming used in the step of depositing the metal material in a film form on the electroforming surface of the mold by electroforming, the frictional resistance of the surface of the formed projection is reduced. 27 to 26 comprising a lubricant for cleaning.
The method for producing a film-like grip member according to any one of the above. 28. The film according to claim 23, further comprising a step of forming a film on the outermost surface of the obtained film-like gripping member to reduce the frictional resistance of the surface. A method for manufacturing a grip member. 29. The film according to claim 23, wherein the shape of the minute recesses on the electroforming surface of the electroforming mold is such that the protrusions obtained thereby satisfy the following conditions. Method of manufacturing a member for a grip. The protrusion has a truncated cone shape or a conide shape, and the diameter Du of the top surface and the diameter Db of the bottom surface satisfy the relationship of Db / 43 ≦ Du ≦ Db / 3, and the height H of the protrusion is 0. 04 mm ≦ H ≦ 0.2 mm, and the tip angle θ of the projection is 0 ° ≦ θ ≦ 45 °. 30. The film according to claim 23, wherein the shape of the minute recesses on the electroforming surface of the electroforming mold is such that the projections obtained thereby satisfy the following conditions. Method of manufacturing a member for a grip. The projection is supported on a pedestal with a projecting larger top surface than the bottom surface of the raised, projecting a height H ₂ of the force, the height H ₁ of the pedestal, the thickness of the sheet to be transported pierce the projections With respect to t, H ₁ ≦ H ₂ ≦ t
/ 2 is satisfied. 31. The film according to claim 23, wherein the shape of the minute recesses on the electroforming surface of the electroforming mold is such that the projections obtained thereby satisfy the following conditions. Method of manufacturing a member for a grip. The protrusion has a conide shape, and the ridge formed by the base of the protrusion has a smooth concave curve. 32. The diameter Da of the bottom surface of the projection and the height H of the projection satisfy a relationship of 1.5H ≦ Da, and the radius R of a concave curve drawn by the ridge and the height H of the projection The method for producing a film-like grip member according to claim 31, wherein the following condition is satisfied: H / 3≤R. 33. A method for manufacturing a gripping rotating member having a large number of small predetermined-shaped projections formed on an outer surface thereof, the method comprising: A step of preparing a mold; a step of depositing a metal material in a film form on the electroforming surface of the mold by electroforming; and forming the electroformed film deposited on the electroforming face of the mold into the mold. To obtain a film-like gripping member having the projections, and covering the film-like gripping member on the rotating member core body with the projections formed on one surface thereof facing outward. The manufacturing method of the rotating member for grips including the process. 34. The method according to claim 33, wherein the mold is a cylindrical mold, and the electroforming surface is an outer peripheral surface of the mold. 35. The mold is a hollow cylindrical mold that can be divided into two or more parts, wherein the hollow portion of the mold has a circular cross section, and the electroforming surface includes The method for manufacturing a rotating member for a grip according to claim 33, wherein the rotating member is an inner peripheral surface of a hollow portion of a mold. 36. An electroforming electrolytic solution used in the step of depositing the metal material in a film form on the electroforming surface of the mold by electroforming, for improving the hardness of the electroformed film. The method for manufacturing a rotating member for a grip according to any one of claims 33 to 35, comprising a brightener. 37. The electrolytic solution for electroforming used in the step of depositing the metal material in a film form on the electroforming surface of the mold by electroforming, the frictional resistance of the surface of the formed projection is reduced. 37. A lubricant comprising:
The method for manufacturing a rotating member for a grip according to any one of the above. 38. The gripping rotating member according to claim 33, further comprising a step of forming a film on the outermost surface of the film-like gripping member to reduce the frictional resistance of the surface. Production method. 39. The grip according to claim 33, wherein the shape of the minute concave portion on the electroforming surface of the electroforming mold is such that the protrusion obtained thereby satisfies the following condition. Manufacturing method of a rotating member for use. The protrusion has a truncated cone shape or a conide shape, and the diameter Du of the top surface and the diameter Db of the bottom surface satisfy the relationship of Db / 43 ≦ Du ≦ Db / 3, and the height H of the protrusion is 0. 04 mm ≦ H ≦ 0.2 mm, and the tip angle θ of the projection is 0 ° ≦ θ ≦ 45 °. 40. The grip according to claim 33, wherein the shape of the minute concave portion of the electroforming surface of the electroforming mold is such that the protrusion obtained thereby satisfies the following condition. Manufacturing method of a rotating member for use. The projection is supported on a pedestal with a projecting larger top surface than the bottom surface of the raised, projecting a height H ₂ of the force, the height H ₁ of the pedestal, the thickness of the sheet to be transported pierce the projections With respect to t, H ₁ ≦ H ₂ ≦ t
/ 2 is satisfied. 41. The grip according to any one of claims 33 to 38, wherein the shape of the minute concave portion on the electroforming surface of the electroforming mold is such that the protrusion obtained thereby satisfies the following conditions. Manufacturing method of a rotating member for use. The protrusion has a conide shape, and the ridge formed by the base of the protrusion has a smooth concave curve. 42. The diameter Da of the bottom surface of the projection and the height H of the projection satisfy a relationship of 1.5H ≦ Da, and the radius R of a concave curve drawn by the ridge and the height H of the projection. The manufacturing method of a rotating member for a grip according to claim 41, wherein the following condition is satisfied: H / 3 ≦ R.