JP2015074508A - Sheets conveying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheets conveying device in which the number of components is decreased and noise in operation can be reduced.SOLUTION: A sheets conveying device 1 includes: a drive pulley 2 rotatably driven by a drive motor; a tension pulley 3; an endless toothed belt 4 bridged between the drive pulley 2 and the tension pulley 3; an inner roller 5 fixedly disposed at an inner circumference side of the toothed belt 4 in a conveyance passage part on which sheets 7 are conveyed along the endless belt 4; and a support roller 6 fixedly disposed to face the inner roller 5 sandwiching the toothed belt 4 therebetween. The inner roller 5 is a compression deformable elastic roller that is in pressure contact with the toothed belt 4.

Description

  The present invention relates to a transport device that transports sheets such as paper sheets and plastic sheets.

As a sheet transport device such as paper sheets used in copiers, printing machines, banknote transport machines, etc., it is bridged between a drive pulley that is driven to rotate by a drive motor, a tension pulley, and a drive pulley and a tension pulley. An endless toothed belt having a convex portion that engages with the drive pulley on the inner peripheral surface, and further, on the inner peripheral surface of the toothed belt in a conveyance path portion that conveys the sheets along the toothed belt. A toothed idler roller having teeth that engage with the convex portion of the toothed belt, and a hard support roller that is disposed opposite to the toothed idler roller across the toothed belt and that is biased by a spring to press the outer peripheral surface of the toothed belt. Are used (see cited document 1).
However, since the conventional sheet conveying apparatus has a large number of parts, the installation of rollers is complicated, which causes a cost increase. In addition, noise during operation due to the meshing sound between the toothed idler roller and the toothed belt is also a problem.

JP 2001-310444 A

  Therefore, a main problem of the present invention is to provide a sheet conveying apparatus that reduces the number of parts. Another object of the present invention is to provide a sheet conveying apparatus in which noise during operation is reduced.

As a result of intensive studies to solve the above problems, the present inventors have completed the present invention. That is, the present invention has the following configuration.
(1) A drive pulley that is rotationally driven by a drive motor, a tension pulley, an endless belt stretched between the drive pulley and the tension pulley, and a conveyance that conveys sheets along the endless belt. The path section includes an inner roller fixedly arranged on the inner peripheral side of the belt and an outer roller arranged fixedly opposed to the inner roller across the belt, and the inner roller presses the belt A sheet conveying apparatus, characterized by being an elastic roller capable of compressive deformation.
(2) The endless belt is a toothed belt having a convex portion that engages with the drive pulley on an inner peripheral surface, and the inner roller is compressively deformable in pressure contact with the inner peripheral surface of the toothed belt. The sheet conveying apparatus according to (1), wherein the outer roller is a hard support roller.
(3) The sheet conveying apparatus according to (1) or (2), wherein the pressing force of the elastic roller is 2 to 3N.
(4) Any of the above (1) to (3), wherein the elastic roller is a hollow roller configured by attaching a roll body having a substantially U-shaped cross section so as to form a cavity on the outer peripheral surface of the support. Crab sheet conveying apparatus.
(5) The sheet conveying apparatus according to any one of (1) to (4), wherein a plurality of a pair of conveying rollers including the elastic roller and the support roller are arranged along the conveying path portion.

In the sheet conveying apparatus of the present invention, the inner roller is an elastic roller capable of compressive deformation that presses against the endless belt. Therefore, as in the conventional sheet conveying apparatus, the spring that biases the hard support roller The number of parts required for the configuration of the sheet conveying apparatus can be reduced.
Further, the endless belt is a toothed belt having a convex portion that engages with the drive pulley on an inner peripheral surface, and the inner roller is an elastic roller capable of compressive deformation that presses against the inner peripheral surface of the toothed belt. In addition, when the outer roller is a hard support roller, the elastic roller absorbs an impact that collides with the convex portion of the toothed belt during operation of the sheet conveying apparatus, and noise during operation can be reduced.

It is the schematic of the sheet conveying apparatus which concerns on one Embodiment of this invention. It is a partial sectional view of a toothed belt in one embodiment of the present invention. (A) is a front view which shows the elastic roller in one Embodiment of this invention, (b) is the II sectional view taken on the line in (a).

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[One Embodiment of the Present Invention]
As shown in FIG. 1, a sheet conveying apparatus 1 according to an embodiment of the present invention includes a drive pulley 2, a tension pulley 3, and an endless toothed belt spanned between these pulleys 2 and 3. 4 and a plurality of conveying rollers 8 composed of an elastic roller 5 (inner roller) and a hard support roller 6 (outer roller) that can be compressed and deformed, and the sheets 7 are placed on the outer peripheral surface of the toothed belt 4. And is to be transported.

(Drive pulley 2)
The drive pulley 2 has a convex portion (not shown) that meshes with the convex portion 4 a of the toothed belt 4 on the outer peripheral surface, and is driven to rotate by a drive motor during operation of the sheet conveying device 1. By meshing with the convex portion 4a, the toothed belt 4 is driven in one direction.

  The diameter, width, and number of teeth of the drive pulley 2 may be appropriately adjusted according to the toothed belt 4. The rotation speed of the drive pulley 2 is usually 1000 to 2000 rpm.

(Tension pulley 3)
The tension pulley 3 has a convex portion (not shown) that meshes with the convex portion 4 a of the toothed belt on the outer peripheral surface, and the belt 4 is bridged with a predetermined tension between the tension pulley 3 and the drive pulley 2. The set tension of the belt 4 may be set as appropriate depending on the material of the belt 4 and the like, and is usually 10 to 140N.

(Toothed belt 4)
The toothed belt 4 is bridged between the drive pulley 2 and the tension pulley 3 and conveys the sheets 7.

  The toothed belt 4 is, for example, a rubber belt in which a core wire, such as a glass fiber, whose tooth profile is provided at right angles to the belt longitudinal direction is embedded, but the present invention is not limited to this, and a commercially available one such as a helical tooth belt is used. Can be used.

As shown in FIG. 2, the shape (tooth shape) of the convex portion 4a is preferably a round tooth shape that is smoothly meshed and that provides high power transmission. This invention is not limited to this, For example, a flat tooth, a helical tooth, a mountain tooth, a trapezoid tooth, etc. may be sufficient.
The height of the convex portion 4a (height H shown in FIG. 2) is usually 0.75 to 1.93 mm. The pitch of the protrusions 4a (pitch P shown in FIG. 2) is usually 2 to 5 mm.

(Elastic roller 5)
In the toothed belt 4, the elastic roller 5 is pressed against the inner peripheral surface having the convex portion 4a with a predetermined pressing force.

  The elastic roller 5 has a compressive deformation property that bites into the convex portion 4a of the toothed roller 4 with a predetermined pressing force. For example, a hollow roller, a soft rubber roller, a soft foam rubber roller, a soft foam plastic A roller or the like can be used.

  For example, as shown in FIG. 3, the hollow roller is a hollow roller 9 configured by attaching a roll body 11 having a substantially U-shaped cross section so as to form a cavity on the outer peripheral surface of the support 10. The paper sheet conveyance roller described in International Publication No. 2011/125551 can be used.

  The radial thickness (length A in FIG. 3B) of the roller body 11 of the hollow roller 9 is preferably 0.15 to 0.3 times the height H of the convex portion 4a. The width of the roller body 11 of the hollow roller 9 (length B in FIG. 3B) is preferably 0.8 to 1.0 times the width of the toothed belt 4.

(Supporting roller 6)
The support roller 6 is disposed to face the elastic roller 5 with the toothed belt 4 interposed therebetween. The support roller 6 is a urethane mold bearing whose surface member quality is made of thermoplastic ether urethane, but is not limited to this in the present invention, and the surface member quality is, for example, a metal such as aluminum; ethylene propylene rubber or urethane rubber. It may be a hard roller such as a hard rubber such as polyacetal. Further, instead of the hard roller, an elastic roller such as the hollow roller 9 described above may be used.
The diameter of the support roller 6 is usually 15 to 25 mm. The width of the support roller 6 is usually 6 to 12 mm.

(Sheets 7)
Examples of the sheets 7 conveyed by the sheet conveying apparatus 1 of the present invention include paper sheets such as banknotes, securities, newspapers, and tickets; plastic sheets such as cards.

(Installation method)
The sheet conveying device 1 spans the toothed belt 4 between the drive pulley 2 and the tension pulley 3, adjusts the set tension of the toothed belt 4 within a predetermined range, and then contacts the toothed belt 4. A plurality of support rollers 6 may be installed at predetermined intervals, and then an elastic roller 5 that can be compressed and deformed may be pressed against the inner peripheral surface of the toothed belt 4 so as to have a predetermined pressing force described later. As described above, in the sheet conveying apparatus 1, the toothed belt 4 is pressed by the compressible and deformable elastic roller 5, so that a spring for urging the support roller 6 is not required. Therefore, the number of parts required for the configuration of the sheet conveying apparatus 1 can be reduced as compared with the conventional sheet conveying apparatus.

  The pressing force of the elastic roller to the inner peripheral surface of the toothed belt is preferably 2 to 3N, more preferably 2.5 to 2.7N. If the pressing force is within the above range, the sheets can be reliably conveyed while reducing the generation of noise due to the engagement between the toothed belt and the elastic roller. Furthermore, when a hollow roller is used as the elastic roller 5, if the pressing force is within the above range, the deformation stress of the hollow roller does not increase too much, and the occurrence of cracks at the location where the deformation stress is concentrated is further suppressed. Generation of wear due to friction between the support 10 (wheel) of the hollow roller and a shaft (not shown) inserted through the central through hole of the support 10 and supporting the support 10 is also suppressed.

  In order to install the elastic roller so that the pressing force is within the above range, the following may be performed. First, separately from the state in which the elastic roller is in line contact with the flat surface, a load equal to the desired pressing force is applied to the elastic roller to bring the elastic roller into surface contact with the flat surface. The amount of compressive deformation of the elastic roller with respect to the radius is measured. Next, when the elastic roller is installed in the sheet conveying apparatus 1, the elastic roller may be installed so that the amount of compressive deformation of the elastic roller due to contact with the inner peripheral surface of the toothed belt becomes the above measured value. .

  For example, when using a hollow roller “H-BU-27-20 × 14” 20 mm in diameter made by NITTA Corporation as an elastic roller and the pressing force is set to 2.7 N, it is necessary to change from a state where line contact is made with a plane. When a load of 7 N is applied to the hollow roller, the hollow roller compressively deforms by 1 mm with respect to the radius of the hollow roller. Therefore, if the hollow roller is installed in the sheet conveying device 1 so that the amount of compressive deformation of the hollow roller due to contact with the inner peripheral surface of the toothed belt 4 is 1 mm, the hollow roller (elastic roller) is toothed. The pressing force to the inner peripheral surface of the belt is 2.7N. In this case, it is excellent in the balance between the conveying force of the sheets and the durability of the hollow roller.

  During operation, the sheet conveying apparatus 1 elastically deforms the contact portion with the convex portion 4a of the elastic roller 5 while the elastic roller 5 and the support roller 6 pinch the toothed belt 4 and the sheets 7. Thereby, while the conveyance locus | trajectory of the sheet | seats 7 is stabilized, the impact which the elastic roller 5 collides with the convex part 4a of the toothed belt 4 can be absorbed, and the noise at the time of operation | movement of the sheet | seat conveyance apparatus 1 can be reduced.

[Other Embodiments of the Present Invention]
Even if the drive pulley, tension pulley, endless belt, inner roller, and outer roller are the following <Configuration 1> or <Configuration 2> as the sheet conveyance device according to another embodiment of the present invention, the above-described implementation Similar to the sheet conveying apparatus 1 according to the embodiment, the number of parts can be reduced and the noise during operation can be reduced.
<Configuration 1>
Drive pulley: Toothless drive pulley Tension pulley: Toothless tension pulley Endless belt: Endless flat belt Inner roller: Compression-deformable elastic roller Outer roller: Hard support roller <Configuration 2>
Drive pulley: toothless drive pulley Tension pulley: toothless tension pulley Endless belt: Endless flat belt Inner roller: Compression-deformable elastic roller Outer roller: Compression-deformable elastic roller

  Commercially available products can be used as the toothless drive pulley, the toothless tension pulley, and the endless flat belt. As the elastic roller capable of compressive deformation, the same elastic roller as described above can be used. As a hard roller, the thing similar to the support roller mentioned above can be used.

  Examples of the present invention will be described below, but the present invention is not limited thereto.

(Example 1)
A sheet conveying apparatus 1 having the configuration shown in FIG. 1 was produced. The drive pulley 2, tension pulley 3, endless toothed belt 4, elastic roller 5 and support roller 6 used were as follows, and the following setting conditions were used.

Drive pulley 2: Misumi's toothed drive pulley "GPA24GT3090-B-P6"
Tension pulley 3: Misumi's toothed tension pulley "AGTFW24-GT3090-6"
Toothed belt 4: "624-3GT-9" manufactured by Gates Unitta Asia Co., Ltd.
Elastic roller 5 (inner roller): Hollow roller “H-BU-27-20 × 14” manufactured by Nitta Corporation (material: urethane rubber (millable urethane), diameter: 20 mm, overall width: 14 mm)
Support roller 6 (outer roller): Hard roller “UMRW20” manufactured by MISUMI Corporation
<Setting conditions>
Set tension of toothed belt 4: 45N
Pressing force of the elastic roller 5: 2.7N
Length L of transport path part: 280 mm

  The elastic roller 5 was installed in the sheet conveying apparatus 1 as follows. First, separately, the hollow roller was brought into surface contact with the flat surface by applying a load of 2.7 N to the hollow roller from a state where the hollow roller was in line contact with the flat surface. In this surface contact state, the amount of compressive deformation of the hollow roller relative to the radius of the hollow roller was 1 mm. Next, when the hollow roller was installed in the sheet conveying apparatus 1, the pressing force of the elastic roller was adjusted so that the amount of compressive deformation of the hollow roller due to contact with the inner peripheral surface of the toothed belt was 1 mm.

(Comparative Example 1)
In the sheet conveying apparatus 1 of Example 1, a sheet conveying apparatus was produced in the same manner as in Example 1 except that the elastic roller 5 and the support roller 6 were configured as follows. In addition, all the hollow rollers (outer roller 6) are installed in a state of being compressed and deformed by 1 mm by contact with the outer peripheral surface of the toothed belt.

Inner roller: MISUMI Corporation toothed idler roller "AGTFW24-GT3090-6"
Outer roller: Hollow roller “H-BU-27-20 × 14” manufactured by Nitta Corporation
<Setting conditions>
Pressing force of hollow roller: 2.7N

(Comparative Example 2)
In the sheet conveying apparatus 1 of Example 1, a sheet conveying apparatus was produced in the same manner as in Example 1 except that the elastic roller 5 and the support roller 6 were changed to the following configurations and setting conditions. For all the outer rollers, the following two coil springs are attached to each outer roller, and the outer rollers are moved from the outer peripheral surface side to the inner peripheral surface side of the toothed belt 4 by the elastic force of the coil springs. It installed so that the toothed belt 4 might be pressed. Each coil spring was installed in a compressed state of 4.4 mm from an unloaded state.

Inner roller: MISUMI Corporation toothed idler roller "AGTFW24-GT3090-6"
Outer roller: Hard support roller "UMRW20" made by MISUMI Corporation
Coil spring: "WR4-15" manufactured by MISUMI Corporation
<Setting conditions>
Outer roller pressing force: 2.64 N (spring constant: 0.3 N / mm, 4.4 mm compression)

(Comparative Example 3)
In the sheet conveying apparatus 1 of Example 1, a sheet conveying apparatus was produced in the same manner as in Example 1 except that the elastic roller 5 and the support roller 6 were changed to the following configurations and setting conditions. And about all the outer rollers, similarly to the comparative example 2, it installed so that a coil spring might be mounted | worn and the toothed belt 4 might be pressed. The coil spring was installed in a state compressed 4.4 mm from the unloaded state.

Inner roller: Toothless idler roller "Polyacetal resin roller" manufactured by Nitta Corporation
Outer roller: Hard support roller "UMRW20" made by MISUMI Corporation
Coil spring: "WR4-15" manufactured by MISUMI Corporation
<Setting conditions>
Pressing force of the outer roller 6: 2.64 N (spring constant: 0.3 N / mm, 4.4 mm compression)

(Noise measurement test)
A sound level meter ("NL-01A" manufactured by Rion Co., Ltd.) is placed on the same work bench with a 1 m interval from the test machine, and the rotational speed of the drive pulley 2 is set to 1000 rpm or 2000 rpm. 1, Total noise during operation of the sheet conveying apparatus of Comparative Examples 1 to 3 was measured. The results are shown in Table 1. The background noise at this time was 53.0 dB (A).

DESCRIPTION OF SYMBOLS 1 Sheet conveying apparatus 2 Drive pulley 3 Tension pulley 4 Toothed belt (belt)
5 Elastic roller (inner roller)
6 Support roller (outer roller)
7 Sheets 8 Transport Roller 9 Hollow Roller 10 Support 11 Roller Body

Claims (5)

A drive pulley that is rotationally driven by a drive motor;
Tension pulley,
An endless belt stretched between the drive pulley and the tension pulley;
An inner roller fixedly arranged on the inner peripheral side of the belt in a conveying path section for conveying sheets along the endless belt;
An outer roller disposed opposite to and fixed to the inner roller across the belt,
The sheet conveying apparatus according to claim 1, wherein the inner roller is an elastic roller capable of compressive deformation that presses the belt.   The endless belt is a toothed belt having a convex portion that engages with the drive pulley on an inner peripheral surface, and the inner roller is an elastic roller capable of being compressively deformed in pressure contact with the inner peripheral surface of the toothed belt. The sheet conveying apparatus according to claim 1, wherein the outer roller is a hard support roller.   The sheet conveying apparatus according to claim 1 or 2, wherein the pressing force of the elastic roller is 2 to 3N.   The sheet according to any one of claims 1 to 3, wherein the elastic roller is a hollow roller configured by attaching a roll body having a substantially U-shaped cross section so as to form a cavity on the outer peripheral surface of the support. Conveying device.   The sheet conveying apparatus according to any one of claims 1 to 4, wherein a plurality of a pair of conveying rollers including the elastic roller and the support roller are arranged along the conveying path portion.

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