JP3333735B2 - Marking method on power transmission belt - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for engraving a mark on a power transmission belt, and more particularly, to a toothed belt, a flat belt,
In power transmission belts such as V-ribbed belts, marks are engraved on the back surface, which is used as a driving surface by contacting pulleys, without damaging the components of the belt, and is flat with other areas The present invention relates to a method of engraving a mark on a power transmission belt that maintains a surface, enables low-noise backside driving, and has a clear and always readable mark.

[0002]

2. Description of the Related Art As a conventional method of making a mark on the back of a power transmission belt, a transfer mark in which an unvulcanized color rubber serving as a mark is adhered on a transparent synthetic resin film substrate is attached to a forming drum. After inserting the cover with rubber, wrap the stretch rubber layer, the core wire and the compression rubber layer, then insert the jacket and vulcanize it, and peel off the transfer mark film from the vulcanized belt sleeve. The mark was transferred to the surface of the cover canvas with rubber.

However, during vulcanization, the rubber of the transfer mark raised from the base material and the base material is pressed into the back surface of the belt sleeve, so that a stepped pattern is formed on the back surface after the base material is peeled off. Area was slightly depressed. On the back surface of the belt, there was a step between the area where the mark was transferred and the area where the mark was not transferred, and the surface did not become flat. Recent V-ribbed belts are used for driving auxiliary equipment of automobiles. In particular, they are wound in a serpentine shape by multi-axis driving, and the belt back has an uneven surface on the back of the belt for engaging a tensioner. And the tensioner vibrated and generated noise. In addition, there is also a problem that the noise at the time of driving the belt is increased in the belt rear driving using the belt rear.

[0004] For this reason, Japanese Patent Publication No. Hei 7-96330 discloses a transfer mark material having a mark adhered on a base material and a canvas containing unvulcanized rubber so that the mark faces the canvas. A method is disclosed in which the mark is transferred to a canvas in advance by peeling the substrate after heating and pressurizing the mark, transferring the mark to a canvas, and using the canvas at the time of forming a belt.
JP-A-52048 proposes a method in which a mark material having a mark adhered on a nonwoven fabric base material is adhered to a cover canvas of a belt, and the mark material and the cover canvas are integrated.

Recently, without using a mark material,
A method of printing a mark directly on the back surface of a belt using an ink jet printer is disclosed in Japanese Patent Application Laid-Open No. 7-233992. This is to print a mark by directly jetting ink on the back of the belt by an ink jet printer.Specifically, prepare a cut from the belt sleeve to a certain width, and put it on the belt support base In this method, a fixed number of lines are fixed, the support table is moved to a predetermined position, an ink jet printer is operated, ink is ejected from the ink head toward the belt, and a desired mark is printed.

[0006]

However, in the method of transferring a mark on the back of the belt or integrating the transfer mark material with the belt, the back of the marked belt is brought into contact with a pulley and used as a drive surface. In this case, the mark is easily rubbed by the pulley and easily erased, and the manufacturer name, product name, manufacturing date, manufacturing lot No. There is also a problem that the mark including "" becomes unreadable soon after the belt runs. Also, the method of printing a mark directly on the back of the belt using an ink jet printer has a problem that the mark disappears because the pulley uniformly wears the back of the belt.

The present invention has been made to solve such a problem. Even when the back surface of the belt is used as a driving surface, a clear mark remains, and a marked surface and a non-marked region are flat surfaces with no steps. It is an object of the present invention to provide a method of marking a power transmission belt in which the noise of a rear drive surface is reduced while maintaining clearness and the clear mark is prevented from disappearing.

[0008]

According to a first aspect of the present invention, there is provided a method for engraving a mark on a power transmission belt having a mark on a back surface which is a driving surface in contact with a pulley. In the method, a mark is engraved by irradiating the rubber layer on the back surface while irradiating the laser beam with a reflection angle by at least one scan mirror so as not to damage a fiber member embedded in the rubber layer, and further, a mark is formed in a recess of the engraved mark. In the power transmission belt mark engraving method of attaching ink having a color different from that of the rear surface without overflowing by ink jet, even if the belt rear surface is used as a driving surface, the mark engraved to a predetermined depth on this surface is The mark pattern does not disappear even after running the belt, and the mark pattern can be kept clear for a long time.

According to a second aspect of the present invention, the back rubber layer of the toothed belt formed of the back rubber layer in which the cords are embedded and the tooth portions provided at predetermined intervals has a depth of 0.1 to 1 mm. In the power transmission belt mark engraving method
Marking can be performed without causing fatal damage to the cord, and the mechanical properties of the belt after laser beam irradiation are not reduced.

According to a third aspect of the present invention, there is provided a method for marking a power transmission belt for stopping the power transmission belt during laser beam irradiation.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention. FIG. 1 is a cross-sectional perspective view of a toothed belt which is one of the marked power transmission belts obtained by the method of the present invention. The toothed belt 1 has a plurality of tooth portions 2 and a core wire along the belt longitudinal direction. 3 and a tooth cloth 5 covering the surfaces of the tooth surface 6 and the tooth bottom 7.

The rubber used for the tooth portion 2 and the back portion 4 is a heat aging resistant material such as hydrogenated nitrile rubber, chlorosulfonated polyethylene (CSM), alkylated chlorosulfonated polyethylene (ACSM), and chloroprene rubber. Are preferred. The hydrogenated nitrile rubber has a hydrogenation rate of 80% or more, and preferably 90% or more in order to exhibit heat resistance and ozone resistance.
A hydrogenated nitrile rubber having a hydrogenation rate of less than 80% has extremely low heat resistance and ozone resistance. Among the above rubbers, as compounding agents, carbon black, zinc white, stearic acid, a plasticizer, an antioxidant, etc. are added, and as a vulcanizing agent, there are sulfur and organic peroxides. The vulcanizing agent is not particularly limited.

The core wire 3 is obtained by twisting filaments of 5 to 9 μm of E glass or high-strength glass and treating them with an RFL solution or the like which is a protective agent or an adhesive made of a rubber compound. . Further, as an organic fiber, a filament of 0.5 to 2.5 denier of a para-aramid fiber (trade name: Kevlar, Technora) having a small elongation with respect to stress and a large tensile strength is twisted, and an RFL solution, an epoxy solution A twisted cord treated with an adhesive of an isocyanate solution and a rubber compound is used. However, the present invention is not limited to these. The diameter of the core wire 3 is 0.6 to 1.10 mm.
However, if it is less than 0.6 mm, the tensile strength of the core wire 3 is low, and it cannot withstand high load transmission. On the other hand, if it exceeds 1.10 mm, it does not hold in terms of belt dimensions.

The canvas used as the tooth cloth 5 is 6 nylon, 66 nylon, polyester, aramid fiber or the like, and may be used alone or in combination. Warp (belt width direction) and weft (belt length direction) of tooth cloth 5
Is a filament yarn or a spun yarn of the above-mentioned fiber, and the woven structure may be any of a plain woven fabric, a twill woven fabric, and a satin woven fabric. In addition, it is preferable to use a part of urethane elastic yarn having elasticity as the weft.

The tooth cloth 5 is treated with an RFL solution, an isocyanate solution or an epoxy solution. RFL
The liquid is obtained by mixing a latex with an initial condensate of resorcinol and formalin. The latex used here is styrene. butadiene. Latex such as vinylpyridine terpolymer, hydrogenated nitrile rubber, chlorosulfonated polyethylene, epichlorohydrin.

Thus, in the toothed belt 1 described above,
The back portion 4 is made of a rubber layer, and the back surface 9, which is the outer surface thereof, is a driving surface that comes into contact with the pulley, and is engraved with a mark 10 represented by a trademark, manufacturing date, lot number, grade, and the like. The engraved mark 10 is obtained by irradiating a laser beam as described later, and has a depth of 0.1 to 1.
mm is important in affecting the mechanical properties such as the tensile strength of the belt, and if it is less than 0.1 mm, the mark 10 may disappear when the wear of the back surface 4 progresses. Meanwhile, 1
If the distance is more than 1 mm, there is a risk that the laser beam may have a bad thermal effect on the core wire 3 buried in the back part 4, and dust and the like are easily accumulated in the dents of the mark 10, and the dust accumulated during traveling is released. May contaminate other equipment. The width of the character of the mark 10 is also 0.1 to 1 mm,
This is arbitrarily adjustable.

The area 11 where the mark 10 imprinted on the back surface 9 exists is flat, and the boundary with the other area 12 is flat without any step. Without this, no vibration noise is generated.

FIG. 2 is a sectional perspective view of a flat belt 13 obtained by the method of the present invention. The belt 13 has a structure in which a core wire 3 such as a rope is embedded in a rubber layer 14 and a back surface 15 is formed. Is a drive surface for contacting the pulley. The back surface 15 is composed of only the rubber layer 14 and is engraved with various marks 10 represented by a trademark, a manufacturing date, a lot number, a grade, and the like.

In the method of engraving a mark by irradiating the above laser beam, a printing laser beam 21 such as a CO ₂ laser beam oscillated from a laser oscillating section 20 is collected by a condenser lens 22 as shown in FIG. The back surface 9 of the belts 1 and 13 installed on the movable support 25 while controlling the reflection angle of the laser light 21 by scanning the scan mirror 24 by the control unit 23 so as to minimize the laser spot on the surface. , 15
To mark the mark 10 within a predetermined range. This is similar to the principle of burning the surface, and the irradiated laser beam 21 instantaneously melts and vaporizes a small portion of the rubber on the back surfaces 9 and 15 to form a depression 27.

When engraving a mark outside the predetermined range,
After the support 25 is moved in the uniaxial direction in parallel, the laser beam 21 is irradiated again to engrave a new mark 10. That is, if the three characters A, B and C are in the maximum range, the support 2
After moving 5, another character is engraved.

The laser beam 21 automatically scans the scan mirror 24 in accordance with a program input by the control unit 23 which has previously input data such as characters, symbols, and figures.
In addition, by controlling ON / OFF of the laser beam 21, a desired input character, symbol, or figure can be drawn.
The distance between the back 9 and 15 of the belt and the scan mirror 24 is 1
Since the laser beam 21 is relatively short, about 100 to 150 mm, it is not necessary to irradiate the intense laser beam 21 for a long period of time.

FIG. 4 shows a state in which the laser beam 21 is applied to the back surfaces 9 and 15 of the belts 1 and 13 to engrave the mark 10 within a predetermined range, and has a depth of 0.1 to 1 mm. The depression 27 of the mark 10 is engraved. Thereby, it is possible to engrave without damaging the fiber member of the cord 3.

When the mark 10 is engraved using the laser light 21 described above, if the mark is directly irradiated onto the surface of the rubber layer, the mechanical properties such as the tensile strength of the belt are not changed. Irradiating the surface with the laser beam 21 cuts and damages the constituent yarns of the canvas, which undesirably lowers the mechanical properties of the belt.

The back surface 9 is irradiated with a laser beam 21 to mark the mark 1.
The belt 1 obtained by engraving 0 is thereafter attached by ink jet using ink having a color different from that of the back surface as shown in FIG. That is, the belt 1 is suspended on the two-axis pulleys 41 and 42 to move the belt at a predetermined speed,
In addition, the head 43 of the inkjet printer 40 is moved, and ink is ejected from the head 43 toward the belt 1 to attach the ink layer 44 to the depression 27 of the mark 10. In this case, the attached amount of the ink layer 44 must not overflow the depression 27 of the mark 10.

[0025]

The present invention will be described below in detail with reference to examples. Example 1 After weaving a woven fabric with a 140 denier 66 nylon warp and a weft composed of 280 denier 66 nylon and 140 denier urethane elastic yarn, the fabric is vibrated in water to give about 1 / l of the width at the time of weaving. After shrinking to 2 widths,
A rubber sheet of the hydrogenated nitrile rubber composition was immersed and dried, and a rubber sheet of the hydrogenated nitrile rubber composition was pressed against the above-mentioned fabric to form a tooth cloth.

Next, a predetermined number of E glass filaments each having a wire diameter of 9 μm are arranged as core wires, immersed in an RFL solution as a protective agent and an adhesive, dried, and then twisted to form a cord. A predetermined number of ropes were aligned and the upper strand was twisted in the direction opposite to the lower twist to produce a pair of S and Z twisted cords.

Each tooth cloth is finished into an endless cylindrical body,
This was set in a mold. From above, a pair of S and Z cords are wound alternately, and a rolled sheet of the hydrogenated nitrile rubber composition is wound thereon. After vulcanization by a normal press-fitting vulcanization method, the vulcanization sleeve is cut into a predetermined width. Thus, individual belts were produced. Belt size is 10 teeth
5. The belt width was 19.1 mm, the tooth pitch was 8 mm, and the tooth shape of the belt was STPD.

Next, using a device as shown in FIG. 3, CO ₂ laser light (12 W, class 4, wavelength 10.6 μm) oscillated from the laser oscillation unit was collected by a condenser lens and connected to the control unit. The scan mirror was caused to scan in two axes, and the back of the belt on the support table whose distance to the scan mirror was adjusted to 130 mm was irradiated, and a mark having a depth of 0.5 mm was imprinted on the surface.

The above-mentioned belt is suspended on a biaxial toothed pulley and run at a predetermined speed. At the same time, the head of the ink-jet printer is moved to operate the ink-jet printer, and white ink is directed from the head to the above-mentioned belt. And the ink adhered to the depression of the mark.

On the other hand, as a belt not engraved with a mark,
A belt having a mark printed directly on the back of the belt using only an inkjet printer was used.

The toothed belt on which the mark was imprinted and the toothed belt on which the mark was printed by an ink jet printer were mounted on a multi-axis bending running tester and allowed to run, and the presence or absence of mark disappearance was examined.

As shown in FIG. 7 , the multi-axis bending running tester 30 has a driving pulley 31 (24 teeth), two fixed driven pulleys 32 and 33 (24 teeth), and one movable. The driven pulleys 34 (24 teeth) are arranged facing each other,
Airer pulley 3 with a pulley diameter of 32 mm between each pulley
5, 36, 37, and 38 are placed. The running conditions were as follows: ambient temperature 100 ° C., axial load 6
0 kgf and the number of rotations of the drive pulley 16 is 5500 rpm.

According to the result, the toothed belt with the mark imprinted thereon did not lose the mark until the life of the belt, while the toothed belt on which the mark was printed began to disappear during the running time. At the time, the mark had partially disappeared.

[0034]

As described above, in the invention according to each of the claims of the present invention, the laser beam is radiated to the rubber layer on the back surface while adjusting the reflection angle by at least one scan mirror and embedded in the rubber layer. A mark is imprinted so as not to damage the fiber member, and a mark is formed on a power transmission belt in which ink having a color different from that of the back surface is adhered to the recess of the marked mark without overflowing by ink jet. Even when used, the mark engraved at a predetermined depth on this surface does not disappear even after running the belt, and the mark pattern can be kept clear for a long time, and the depth is 0.1 to 1 mm. When the mark is engraved, the core wire can be engraved without causing fatal damage, and the mechanical properties of the belt after laser beam irradiation are not reduced.

[Brief description of the drawings]

FIG. 1 is a sectional perspective view of a toothed belt which is one of the marked power transmission belts obtained by the method of the present invention.

FIG. 2 is a sectional perspective view of a flat belt obtained by the method of the present invention.

FIG. 3 is a diagram showing a method of engraving a mark by irradiating a laser beam.

FIG. 4 is a diagram showing a state in which a laser beam is applied to the back surface of the toothed belt to engrave a mark.

FIG. 5 is a diagram illustrating a process of attaching ink by ink jet to a mark engraved on the back surface of the belt.

FIG. 6 is a sectional view taken along line XX of FIG. 5;

FIG. 7 is a schematic view of a multi-axis bending running test machine.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 toothed belt 9 back surface 10 mark 11 area where mark exists 13 flat belt 15 back surface 20 laser oscillation unit 21 laser beam 22 condenser lens 23 control unit 24 scan mirror 27 dent 40 inkjet printer 43 head

──────────────────────────────────────────────────続 き Continued from the front page Examiner Katsumi Enari (56) References JP-A-10-252833 (JP, A) JP-A-8-152048 (JP, A) JP-A 8-174263 (JP, A) JP-B-47-22115 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) B41M 1/32 F16G 1/00

Claims (3)

(57) [Claims] In a method for marking a power transmission belt having a mark on a rear surface which is a driving surface in contact with a pulley, a laser beam is irradiated on a rubber layer on the rear surface while adjusting a reflection angle by at least one scan mirror. A power transmission belt, wherein the mark is engraved so as not to damage the fiber member embedded in the rubber layer, and ink having a color different from that of the back surface is adhered to the depression of the engraved mark without overflowing by ink jet. Mark engraving method. 2. A method in which a mark having a depth of 0.1 to 1 mm is stamped on a back rubber layer of a toothed belt formed by a back rubber layer in which a cord is embedded and tooth portions provided at predetermined intervals. Item 1
The mark engraving method of the power transmission belt described in the above. 3. The method for marking a mark on a power transmission belt according to claim 1, wherein the power transmission belt is kept stationary during the irradiation of the laser beam.