JP2000193040A - Toothed belt and drive transmission system using this toothed belt - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To reduce a meshing vibration between a toothed belt and a pulley and obtain a clear printed image. A printer includes a driving pulley that is driven to rotate by a motor, and a driven pulley. A toothed belt 30 is wound around the two pulleys 16 and 18 with a predetermined tension. The carriage 12 is attached to the toothed belt 30.
Is fixed. The toothed belt 30 includes a belt main body made of chloroprene rubber having a hardness of 70 JIS-A. A belt tooth bottom 32 and a belt tooth 3 are provided on one surface of the belt body.
4 and a canvas is provided on the surface. The canvas is treated with a resorcin-formalin-latex solution.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive transmission system for driving, for example, a carriage of a printer via a toothed belt.

[0002]

2. Description of the Related Art In recent years, with the spread of color dot printers of the wire dot type, the ink jet type, the laser beam type, the thermal type, and the like, the performance thereof has been required to be improved. In color printing, for example, three dots of ink are overlaid on one dot and printed to reproduce the color of that dot. A carriage having a printing section of three colors of ink is fixed to an endless toothed belt, which is wound by pulleys driven by a motor. The rotational drive of the motor is transmitted to the carriage via the toothed belt, and line printing of each color is performed when the carriage moves in a direction perpendicular to the sheet feeding direction.
That is, in color printing, the carriage reciprocates in the same location by the number of ink colors, for example, three times.

[0003]

In order to obtain a clear printed image, it is required that the line printing positions for the three colors be exactly the same. However, if the vibration caused by the mesh between the toothed belt and the pulley is large, the vibration may cause the carriage to shift from a predetermined printing position in a vertical direction or a horizontal direction, resulting in a blurred print image in which each ink color is shifted. It is a problem.

[0004] The present invention has been made in view of such a point, and an object of the present invention is to obtain a clear printed image by reducing the meshing vibration between the toothed belt and the pulley.

[0005]

According to the present invention, there is provided a toothed belt including a tooth formed at predetermined intervals along a longitudinal direction on at least one surface of the belt main body, and a belt main body having the tooth formed thereon. A canvas covering the surface, wherein the belt body has a synthetic rubber having a hardness of 65 to 75 JIS-A as a raw rubber, and the canvas is treated with a resorcinol-formalin-latex solution.

In a toothed belt, the distance between two adjacent teeth is preferably 3 mm or less. The synthetic rubber used as a raw rubber has a hardness of 70 JI.
The material may be SA, or the material may be chloroprene rubber. Further, it is preferable that the side surface of the tooth portion is arc-shaped.

[0007] The drive transmission system according to the present invention comprises:
A toothed belt, and a drive pulley and a driven pulley, which engage with the teeth of the toothed belt and have grooves formed on the outer peripheral surface thereof and having substantially the same shape as the teeth, and the toothed belt is wound around the drive pulley and the driven pulley. By being turned, the rotational driving force of the driving pulley is transmitted to the driven pulley via the toothed belt. In the present invention, the toothed belt includes a tooth portion formed on the at least one surface of the belt body at predetermined intervals along the longitudinal direction, and a canvas covering the surface of the belt body on which the tooth portion is formed. The main body of the belt is made of synthetic rubber having a hardness of 65 to 75 JIS-A as raw rubber, and the canvas is treated with a resorcinol-formalin-latex solution.

In the drive transmission system, the distance between two adjacent teeth of the toothed belt is preferably 3 mm or less. The synthetic rubber used as the raw rubber for the toothed belt may have a hardness of 70 JIS-A, and may be made of chloroprene rubber. Further, it is preferable that the side surfaces of the tooth portions of the toothed belt and the groove portions of the drive pulley and the driven pulley are arc-shaped. The drive pulley is preferably formed of metal, and the driven pulley is preferably formed of synthetic resin.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a drive transmission system and a toothed belt according to the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 and 2 show a printer to which a drive transmission system according to an embodiment of the present invention is applied. FIG. 1 is a side view showing the vicinity of the carriage of the printer, and FIG. 2 is a perspective view thereof. The printer 10 includes a carriage unit 12, and the carriage unit 12 is integrally provided with a print head 11 having an ink ejection port 11a. The carriage unit 12 includes two upper and lower parallel guide rods 15.
, And is movable in the axial direction of these guide rods 15, that is, in the direction of arrow A. The carriage unit 12 is fixed to an endless toothed belt 30 provided between the two guide rods 15 by a fixing member 17.

The toothed belt 30 is wound around two pulleys, that is, a driving pulley 16 and a driven pulley 18, and is provided with a constant tension by a spring 19 for urging the driven pulley 18 away from the driving pulley 16. . The drive pulley 16 and the driven pulley 18 are rotatably supported and fixed to a printer main body (not shown). The drive pulley 16 is driven to rotate by a motor 14.

The outer peripheral surfaces of the driving pulley 16 and the driven pulley 18 have a pulley tooth portion 22 and a pulley groove portion 2 respectively.
4 are alternately formed. On the other hand, on one surface of the toothed belt 30, a belt tooth bottom portion 32 having a size and shape corresponding to the pulley tooth portion 22 and a belt tooth portion 34 having a size and shape corresponding to the pulley groove portion 24 are alternately formed. The toothed belt 30 is rotated by the engagement between the pulley tooth portions 22 and the belt tooth bottom portions 32 and the engagement between the pulley groove portions 24 and the belt tooth portions 34.

The carriage 12 reciprocates between the driving pulley 16 and the driven pulley 18 as the toothed belt 30 rotates. In this way, the driving force of the motor 14 is transmitted to the carriage section 12 via the toothed belt 30, and the carriage section 12 moves in the direction of arrow A with respect to the printing paper 21.

FIG. 3 is a perspective view showing a part of the toothed belt 30. The toothed belt 30 includes a belt body 36, and a belt tooth portion 34 and a belt tooth bottom portion 32 are alternately formed on one surface of the belt body 36 along the longitudinal direction. A canvas 38 is provided on the surface of the belt teeth 34 and the belt teeth bottom 32. The canvas 38 is formed as a woven fabric made of nylon fibers. A cord 40 extending in the longitudinal direction is embedded in the belt main body 36. The plurality of core wires 40 are arranged in parallel with each other at a constant interval in the width direction of the belt.

In the toothed belt 30, the distance between two adjacent belt teeth portions 34, that is, the tooth pitch may be 2 mm or 1.5 mm generally used for printers and scanners. In order to obtain a clear printed image, the tooth pitch is preferably 3 mm or less.

As the raw material rubber for the belt body 36, chloroprene rubber, hydrogenated nitrile rubber, urethane rubber, or the like is suitably used, but is not limited thereto, and may be any rubber that can be vulcanized and molded. The hardness is preferably 70. The hardness is a value measured by a JIS-A hardness meter.

As shown in FIG. 4, the belt teeth 34 have an arc-shaped cross section. Although FIG. 2 shows a diagram defining the size and shape of the toothed belt 30, the size and shape are not particularly limited. The size, the tooth width, and the number of teeth of the toothed belt 30 are appropriately determined according to various running conditions.

The shape of the toothed belt 30 shown in FIG. 4 will be described. The toothed belt 30 is designed based on a reference line PL for determining a tooth pitch. The belt tooth portion 34 has a center line Y perpendicular to the reference line PL, and is formed symmetrically with respect to the center line Y. Centerline distance B _W of the two belts adjacent teeth is tooth pitch. The distance from the reference line PL to the root surface, that is, the root line X parallel to the reference line PL is B _D
Indicated by The tooth height, that is, the distance from the tooth bottom surface to the tooth tip surface is indicated by _BH .

Representatively, the left wheel of the center line Y in FIG.
Guo will be described. Belt tooth profile is three consecutive
Arc, ie arc A₁A_TwoAnd arc A_TwoA_ThreeAnd arc A_ThreeA_FourAnd by
Formed. Arc A₁A_TwoIs point A₁From point A_TwoExtend to
Indicates an arc. Arc A ₁A_TwoIs the point C at the center₁Toss
Radius R₁Arc A_TwoA_ThreeIs the point C at the center_TwoWhen
Radius R_TwoArc A_ThreeA_FourIs the point C at the center_Three
Radius R_ThreeIs an arc.

[0020] Tooth pitch B_WIs 2, the tooth pitch B
_WDistance B to_D, Tooth height B_H, Radius R₁, R_TwoAnd
And R_ThreeIs B_D= 0.254, B_H= 0.7
5, R₁= 0.15, R_Two= 1, R_Three= 0.555
Can be Also, point C₁, C _TwoAnd C_ThreeThe relative position of
Each C₁= (0.740, 0.150), C_Two=
(-0.4,0), C_Three= (0, 0.195)
It is. Note that these relative positions are based on the bottom line X and the center line Y.
The origin O is the intersection point O of the tooth, and the bottom line X and the center line Y are two axes.
And the value is the tooth pitch B_WAnd 2
It is shown by the ratio when doing. Note that in these two-dimensional coordinates
The X axis goes to the left of the figure, and the Y axis goes to the bottom of the figure.
It is assumed that the numerical value increases as going.

Next, the canvas 38 will be described. Canvas 38
Is formed from a plain woven fabric woven with a crimped yarn having elasticity along the longitudinal direction of the toothed belt 30 and a non-stretchable yarn along the width direction of the toothed belt 30. It may be formed by a woven cloth, for example, a woven cloth obtained from satin weave or various modified weaves.

As the crimped yarn of the canvas 38, a synthetic fiber, for example, a nylon fiber crimped is preferably used. As the non-stretchable yarn of the canvas 38, for example, a filament yarn of nylon fiber is suitable. Thus, in the canvas 38, the crimped yarn having elasticity along the longitudinal direction of the toothed belt 30 is used, and the toothed belt 3
A non-stretchable yarn is used along the width direction of 0. Thereby, the canvas 38 is provided with elasticity along the longitudinal direction of the toothed belt 30.

The canvas 38 is made of resorcinol-formalin-to improve the adhesion of the belt body 36 to the rubber component.
The treatment is performed with latex, that is, an RFL solution. More specifically, after the canvas 38 is immersed in the RFL liquid, the canvas 38 is dipped by a pair of rolls at a predetermined drawing pressure and dried. By repeating this process a desired number of times, the amount of the solid component of the RFL solution adhered to the canvas 38 is adjusted.

The canvas 38 thus treated with the RFL solution has good adhesion to the belt body 36 and also has flexibility to allow deformation of the belt body 36. Further, wear of the toothed belt 30 is prevented.

As the core wire 40, a filament obtained by collecting and twisting a large number of filaments having a fine diameter is used. As the filament, glass fiber or aramid fiber having a small elongation with respect to stress and a large tensile strength is preferably used. Each filament is treated with an RFL solution that is a protective agent or an adhesive.

In order to improve the adhesion of the belt body 36 to rubber, an overcoat layer is formed on the outermost layer of the core wire 40. The overcoat layer is formed, for example, by immersing the core wire 40 in a rubber solution of chlorosulfonated polyethylene and then drying.

As described above, in the drive transmission system of the present invention, the hardness of the chloroprene rubber in the toothed belt 30 is changed from 80 to 70 in the related art, that is, the flexible rubber is used as the rubber of the belt body 36, and the canvas 38 is used. By using a material treated with the RFL solution, the overall meshing accuracy with the driving pulley 16 or the driven pulley 18 is improved, and vibration caused by the meshing can be suppressed. Therefore, if the drive transmission system of the present invention is applied to a printer, a clear print image can be obtained without the carriage unit 12 being shifted from a predetermined print position in the vertical direction or the horizontal direction.

FIG. 5 is a view showing the shape of the drive pulley 16 and a partially enlarged view of a cross section of the drive pulley 16. The drive pulley 16 is formed of a metal such as brass, for example, and is formed into a shape corresponding to the toothed belt 30 shown in FIG. The driven pulley 18 has the same size and shape as the driving pulley 16, and a description thereof will be omitted. The driven pulley 18 is formed of a synthetic resin such as a polyacetal thermoplastic resin.

The pulley groove 2 is formed on the outer peripheral surface of the driving pulley 16.
4 and the pulley tooth portions 22 are formed alternately, the pulley groove portion 24 has substantially the same size and shape as the belt tooth portion 34 of the toothed belt 30, and the pulley tooth portion 22 has the same size and shape as the belt tooth bottom portion 32. are doing. A detailed description of the dimensions and shape of the driving pulley 16 is omitted, but a dashed line PL ′ shown on the outer circumference of the pulley tooth portion 22 shown in FIG.
It coincides with the reference line PL when the toothed belt 30 is engaged. The distance P _D from the one-dot chain line PL ′ to the tip of the pulley tooth portion 22 is substantially equal to, for example, the distance B _D of the toothed belt 30 shown in FIG. The distance from the pulley teeth 22 tip to the pulley groove 24 deepest, i.e. groove depth P _H is approximately equal to the tooth height B _H of the toothed belt 30.

[0030]

The present invention will be described below with reference to examples and comparative examples. The present invention is not limited by these examples.

Example Belt and Comparative Example Belt An example of a toothed belt according to the present invention is referred to below as Example Belt 1. Two types of toothed belts were also manufactured as comparative examples of the toothed belt according to the present invention, which are referred to below as Comparative Example belts 1 and 2.

The structures of the example belt 1 and the comparative example belts 1 and 2 are as shown in Table 1 below.

[Table 1]

Example belt: As shown in Table 1, in the example belt, chloroprene rubber having a hardness of 70 JIS-A was used as a raw material rubber of the belt body 36.
Glass fiber was used for the cord 40, and the diameter of the cord 40 was 0.26 mm. The canvas 38 used was a plain woven nylon fiber. The canvas 38 was treated with an RFL solution using chloroprene rubber latex as a latex component, that is, immersed in the RFL solution, and then dried to form an RFL layer on the canvas surface. The thickness of the canvas 38 was 0.100 mm.

The dimensions and shape of the embodiment belt are shown in FIG.
Was applied, and the tooth pitch was determined to be 2 mm. The number of teeth was 360 and the tooth width was 6 mm.

The cord 40 will be described. Three yarns, each of which converges 200 glass fibers having a diameter of 9 μm, are collected and RFL
After the treatment, the strand was twisted in one direction, that is, twisted in a Z twist or an S twist.

Comparative Example Belt 1: As shown in Table 1, in Comparative Example Belt 1, chloroprene rubber having a hardness of 70 JIS-A was used as a raw material rubber of the belt body 36. Glass fiber was used for the cord 40, and the diameter of the cord 40 was 0.26 mm. Nylon fiber was used for the canvas 38. The canvas 38 was treated with a rubber glue solution and had a thickness of 0.136 mm. The comparative example belt 1 is substantially the same as the example belt except that a rubber glue solution is used instead of the RFL liquid in the canvas processing.

Comparative Example Belt 2 As shown in Table 1, in Comparative Example Belt 2, chloroprene rubber having a hardness of 80 JIS-A was used as a raw material rubber for the belt body 36. Glass fiber was used for the cord 40, and the diameter of the cord 40 was 0.26 mm. Nylon fiber was used for the canvas 38. The canvas 38 was treated with a rubber glue solution and had a thickness of 0.136 mm. Comparative Example Belt 2 had a chloroprene rubber hardness of 80 JIS-A.
This is substantially the same as the belt of the example, except that the rubber paste solution is used instead of the RFL solution in the canvas processing.

[Running Test of Toothed Belt and Its Evaluation] A running test was performed using the three types of toothed belts as described above, ie, the example belt and the comparative belts 1 and 2.

FIG. 6 is a diagram showing a schematic configuration of a running test apparatus. The running test device includes a driving pulley 62 and a driven pulley 64, and the belt 61 with a tooth to be tested is wound around the two pulleys 62 and 64 with a predetermined belt tension. The driving pulley 62 is rotated in one direction, and its rotation speed is 700 rpm. The shape shown in FIG. 4 is applied to the two pulleys 62 and 64, and the number of teeth is 20, respectively. The drive pulley 62 was molded from brass, and the driven pulley 64 was molded from a polyacetal thermoplastic resin.

In the first running test apparatus, running tests were performed on the example belt and the comparative belts 1 and 2 under the same conditions. For evaluation of the running test, four stages of belt tension, that is, 0.5 kgf, 1 kg
The rotation fluctuation rates at f, 1.5 kgf, and 2.0 kgf were measured, respectively. The rotation fluctuation rate indicates a fluctuation amount of the driven pulley 64 with respect to the number of rotations to be rotated, that is, a shake amount, and is indicated as a ratio (unit:%) with respect to the rotation number of the driving pulley 62. Also, each belt tension is
It is set by changing the relative position of the driven pulley 64 with respect to the driving pulley 62.

The results of the first running test are shown in FIG. The rotation fluctuation rate of the example belt is shown by a solid line in FIG. 7, and this solid line is a straight line rising slightly to the right with little change. That is, the rotation fluctuation rate of the example belt increased substantially in proportion to the increase in the belt tension, and the rotation fluctuation rate was as low as 0.03% or less at any belt tension.

On the other hand, the rotation fluctuation rate of the comparative example belt 1 (indicated by a broken line in FIG. 6) is as follows.
At 5 kgf and 2.0 kgf, this is not much different from that of the example belt.
% And a high value was shown. In addition, the rotation fluctuation rate of the comparative example belt 2 indicated by the one-dot chain line in FIG.
Was 0.064% at the maximum.

From the above results, it can be seen that, compared to the comparative belts 1 and 2 which were subjected to the canvas treatment with the rubber glue solution, the belt of the embodiment which had been subjected to the canvas treatment with the RFL solution had a lower rotation fluctuation rate. . Especially when the belt tension is 1.0
The range of kgf to 1.5 kgf, which is a value generally used when a toothed belt having a tooth pitch of 2 mm is installed in a printer or the like, particularly in this range, a reduction in rotation fluctuation rate is remarkably exhibited.

When the belt tension is lower than this range,
Since the toothed belt shakes during running, that is, the vibration increases when the toothed belt and the pulley mesh with each other, it is not suitable for a printer or the like. If the belt tension is higher than this range, the load on the drive shaft or the driven shaft increases, and there is a possibility that distortion may occur in the mounting portion or the like, and vibration may be induced. Therefore, the belt tension is required to be a value that allows both a reduction in vibration and a low load on the mounting portion. 2m tooth pitch
In the case of m, the appropriate belt tension is about 1.0 kgf. As described above, the rotation fluctuation rate of the example belt was significantly reduced at a belt tension of about 1.0 kgf as compared with the comparative example belts 1 and 2.

As compared with the comparative example belt 2, the comparative example belt 1 in which the hardness of the chloroprene rubber is lower, the rotation fluctuation rate was reduced to some extent, but it was 1.0 kgf to 1.5 kgf.
The tendency to show a high value in the range of f did not change, and in this range, the value was higher than that of the comparative example belt 2. However, in the example belt using the chloroprene rubber having low hardness and the RFL-treated canvas, the rotation fluctuation rate could be remarkably reduced particularly in the range of 1.0 kgf to 1.5 kgf.

By using the toothed belt having a small rotation fluctuation rate in the printer as described above, the vibration of the carriage attached to the toothed belt can be reduced, and the carriage can be moved vertically or horizontally from a predetermined printing position. A clear printed image can be obtained without shifting.

[0047]

According to the present invention, the vibration of meshing between the toothed belt and the pulley can be reduced, and a clear printed image can be obtained.

[Brief description of the drawings]

FIG. 1 is a side view showing a part of a printer provided with a drive transmission system according to the present invention, showing a vicinity of a carriage unit.

FIG. 2 is a perspective view showing the vicinity of a carriage unit shown in FIG. 1 together with printing paper.

FIG. 3 is a partial perspective view showing an embodiment of a toothed belt according to the present invention.

FIG. 4 is a diagram showing an example of a cross-sectional shape of a toothed belt.

5 is a diagram showing a cross-sectional shape of a driving pulley corresponding to the toothed belt shown in FIG.

FIG. 6 is a schematic diagram of a running test apparatus for performing a running test of the example belt and the comparative example belts 1 and 2 according to the present invention.

FIG. 7 is a graph showing a running test result by the running test device shown in FIG. 6;

[Explanation of symbols]

 Reference Signs List 10 printer 12 carriage unit 14 motor 16 drive pulley 18 driven pulley 30 toothed belt

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3J049 AA03 BF02 BH01 BH04 CA10 4F100 AG00 AK28A AK28K AK33B AK48 AN02A BA02 DD04A DG07 DG12 DG14B DH02 EJ82B GB48 JH02 JK12A JL00 JL01 YY00A

Claims (11)

[Claims] 1. A belt comprising: teeth formed on at least one surface of a belt main body at predetermined intervals along a longitudinal direction; and a canvas covering a surface of the belt main body on which the teeth are formed. The body is made of raw rubber with hardness of about 65JIS-
A toothed belt having a synthetic rubber of A to about 75 JIS-A, wherein the canvas is treated with a resorcinol-formalin-latex solution. 2. The toothed belt according to claim 1, wherein the predetermined interval is 3 mm or less. 3. The synthetic rubber has a hardness of about 70 JIS-A.
The toothed belt according to claim 1, wherein: 4. The toothed belt according to claim 1, wherein said synthetic rubber is chloroprene rubber. 5. The toothed belt according to claim 1, wherein a side surface of the tooth portion has an arc shape. 6. A belt comprising: tooth portions formed at predetermined intervals along a longitudinal direction on at least one surface of a belt main body; and canvas covering a surface of the belt main body on which the tooth portions are formed. The body is made of raw rubber and has a hardness of about 65 JI
A toothed belt having a synthetic rubber of SA to about 75 JIS-A, wherein the canvas is treated with a resorcinol-formalin-latex solution; and engaging the toothed portion of the toothed belt. A groove portion having substantially the same shape as the tooth portion includes a driving pulley and a driven pulley formed on an outer peripheral surface; and the toothed belt is wound around the driving pulley and the driven pulley, thereby forming the driving pulley. A drive transmission system, wherein the rotational driving force is transmitted to the driven pulley via the toothed belt. 7. The drive transmission system according to claim 6, wherein the predetermined interval is 3 mm or less. 8. The synthetic rubber has a hardness of about 70 JIS-A.
The drive transmission system according to claim 6, wherein: 9. The drive transmission system according to claim 6, wherein the synthetic rubber is chloroprene rubber. 10. The drive transmission system according to claim 6, wherein side surfaces of the teeth and the grooves are arc-shaped. 11. The drive transmission system according to claim 6, wherein the drive pulley is formed of metal, and the driven pulley is formed of synthetic resin.