WO2017168924A1

WO2017168924A1 - Method for manufacturing toothed belt, core body layer component, and method for manufacturing core body layer components

Info

Publication number: WO2017168924A1
Application number: PCT/JP2017/000473
Authority: WO
Inventors: 吉田　雅一; 中野　嘉久
Original assignee: バンドー化学株式会社
Priority date: 2016-03-30
Filing date: 2017-01-10
Publication date: 2017-10-05
Also published as: JP6132949B1; JP2017177545A

Abstract

The purpose of the present invention is to provide a method for manufacturing a toothed belt, which method is capable of relatively easily suppressing variation in tension or embedment depth of core body cords while suppressing an increase in cost of a manufacturing apparatus. This method for manufacturing a toothed belt in which core body cords are embedded roughly at equal intervals in the width direction of the toothed belt, is provided with: a step for preparing a plurality of core body cords, a sheet-like core body layer component having a cover part of which the main component is a thermoplastic resin and that covers the core body cords, a sheet-like base part, and a tooth part layer component that has a plurality of teeth provided roughly at equal intervals in a conveying direction and that is arranged on one surface of the base part; and a step for heat-welding one or more of the core body layer components to a surface opposite to the surface to which the teeth of the tooth part layer component are provided. Preferably, a sheet-like backside layer component is further prepared in the preparing step, and the backside layer component is heat-welded to the core body layer component in the heat-welding step.

Description

Toothed belt manufacturing method, core layer component, and core layer component manufacturing method

The present invention relates to a method for manufacturing a toothed belt, a core layer component, and a core layer component manufacturing method.

Toothed belts are used in various fields such as drive belts for large processing machines such as machine tools and molding machines, automobile transmission belts, and precision transmission belts for office automation equipment. As such a toothed belt, a belt in which a plurality of core cords are embedded at substantially equal intervals is used in order to improve the strength, durability, and driving accuracy of the belt.

The number of core cords is usually several tens, although it depends on the width of the toothed belt. In order to avoid these core cords from being exposed from the conveying surface or waviness on the conveying surface, the tension between the cords should be approximately equal and the distance from the conveying surface of the toothed belt should be It needs to be buried so as to be substantially equal. In response to this requirement, for example, a toothed belt that is embedded to a predetermined depth while heating each core cord while controlling the tension of the core cord using a core cord feeding device corresponding to the number of core cords. A manufacturing method is disclosed (see JP-A-2015-505758).

In the above conventional toothed belt manufacturing method, the tension and the embedded depth of the core cord are adjusted by controlling the tension and heating temperature of each core cord. Thus, a feeding device and a heating device are required. For this reason, in the manufacturing method of the said conventional toothed belt, the cost of a manufacturing apparatus tends to increase.

Also, in the above conventional method for manufacturing a toothed belt, the tension and embedment depth of each core cord is adjusted. Therefore, in the conventional method for manufacturing a toothed belt, since the number of objects to be controlled is large and the control is complicated, the tension and the embedding depth generated in each core cord are likely to vary.

JP2015-505758A

The present invention has been made in view of such inconveniences, and it is possible to relatively easily suppress variations in the tension of the core cord and the embedded depth while suppressing an increase in the cost of the manufacturing apparatus. An object is to provide a method for manufacturing a belt. Another object of the present invention is to provide a core layer component that can suppress variations in core cord tension and embedment depth relatively easily while suppressing an increase in cost of the manufacturing apparatus. There is. Still another object of the present invention is to provide a method for manufacturing a core layer component that can relatively easily suppress variations in the tension and embedment depth of the core cord.

The invention made to solve the above problems is a method of manufacturing a toothed belt in which core cords are embedded at substantially equal intervals in the width direction, and a plurality of core cords and covering the core cords. The sheet-shaped core layer component having a covering portion mainly composed of a thermoplastic resin, the sheet-shaped base portion, and one surface of the base portion are provided at substantially equal intervals in the conveying direction. Preparing a tooth layer component having a plurality of teeth, and heating one or more core layer components to a surface opposite to the surface on which the tooth portions of the tooth layer component are provided. And a step of welding.

The manufacturing method of the toothed belt uses a core layer component that includes a plurality of core cords and a coating portion that covers the core cords and has a thermoplastic resin as a main component. That is, one core layer component has a plurality of core cords. For this reason, the manufacturing method of the said toothed belt can reduce the feeding apparatus for arrange | positioning the components for core layer layers from the number of core cords. Moreover, since the said core part component can be manufactured by coat | covering a core code | cord with a thermoplastic resin, it can be prepared comparatively easily and cheaply. Therefore, the manufacturing method of the toothed belt can suppress an increase in cost of the manufacturing apparatus. Moreover, in the manufacturing method of the toothed belt, a plurality of core cords of the core layer component are fixed in advance with a thermoplastic resin. For this reason, the manufacturing method of the said toothed belt can adjust collectively the tension | tensile_strength and embedding depth of the several core code | cord | chord which one component for core body layers has. Thereby, the manufacturing method of the toothed belt can make the number of controlled objects smaller than the number of core cords. Therefore, the manufacturing method of the toothed belt can suppress variations in the tension of the core cord and the embedment depth as compared with the case where the control is performed in units of the core cord.

In the preparation step, a sheet-like back layer component is further prepared. In the thermal welding step, the back layer component is opposite to the surface on which the tooth layer component of the core layer component is disposed. It is better to further heat-weld to the surface side. By smooth welding the back layer component and the core layer component in this manner, the transport surface of the toothed belt to be manufactured can be smoothed.

The preparatory step may include a step of forming the core layer part by extruding the thermoplastic resin composition. Since the preparation step includes the formation step as described above, a toothed belt can be continuously manufactured from the thermoplastic resin composition, and thus the manufacturing cost for managing the core layer component can be reduced. Also, since the core layer component is prepared by extrusion molding, the core layer component in which a plurality of core cords are arranged so that the distance from the conveying surface of the toothed belt is substantially equal is relatively easy. Obtainable.

Another invention made to solve the above problems is a component used as a core layer of a toothed belt in which a core cord is embedded at substantially equal intervals in the width direction, and a plurality of core cords, and The core cord is covered and has a covering portion mainly composed of a thermoplastic resin.

Since the core body cord is preliminarily fixed with a thermoplastic resin in the core body layer component, the tension and embedding depth of a plurality of core body cords included in the core body layer component are summarized when the toothed belt is manufactured. Can be adjusted. Therefore, by manufacturing the toothed belt using the core layer component, the feeding device can be reduced from the number of the core cords, and the tension of the core cords and the variation in the embedded depth can be relatively reduced. It can be easily suppressed. Moreover, the said core body layer component can manufacture a toothed belt by heat-welding with a tooth | gear part layer part by making it into the component which fixed the core code with the thermoplastic resin. For this reason, manufacturing time can be shortened compared with the case where a core cord is directly embedded and a toothed belt is formed.

Still another invention made in order to solve the above-described problem is that a core cord is used as a core layer of a toothed belt in which a core cord is embedded at substantially equal intervals in the width direction, and a plurality of core cords and the core A method for manufacturing a core layer part component that covers a body cord and has a covering portion mainly composed of a thermoplastic resin, comprising a step of extruding a thermoplastic resin composition.

In the core layer component manufacturing method, since the core layer component of the toothed belt is manufactured by extrusion, a core body in which a plurality of core cords are arranged so that the distances from the surface are substantially equal. Layer parts can be obtained relatively easily.

Here, “main component” means a component having the highest content, for example, a component having a content of 50% by mass or more, preferably 90% by mass or more.

As described above, the toothed belt manufacturing method of the present invention can relatively easily suppress variations in the tension of the core cord and the embedment depth while suppressing an increase in the cost of the manufacturing apparatus. In addition, by using the core layer part of the present invention, it is possible to relatively easily suppress variations in the tension of the core cord and the embedment depth while suppressing an increase in the cost of the manufacturing apparatus. Manufacturing time can be shortened. Moreover, the manufacturing method of the core body layer component according to the present invention can relatively easily suppress variations in the tension and embedment depth of the core body cord.

It is a flowchart which shows the flow of the manufacturing method of the toothed belt which concerns on one Embodiment of this invention. It is a typical perspective view which shows the components for core layers used for the manufacturing method of the toothed belt of FIG. It is a typical perspective view which shows the component for tooth part layers used for the manufacturing method of the toothed belt of FIG. It is a typical perspective view which shows the components for back layers used for the manufacturing method of the toothed belt of FIG. It is a typical side view which shows the manufacturing apparatus of the toothed belt used for the manufacturing method of the toothed belt of FIG. It is a typical perspective view which shows the toothed belt obtained by the manufacturing method of the toothed belt of FIG.

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

The toothed belt manufacturing method of FIG. 1 is a toothed belt manufacturing method in which core cords are embedded at substantially equal intervals in the width direction, and includes a preparation step (S1) and a heat welding step (S2). .

In the manufacturing method of the toothed belt, the core layer component 1 shown in FIG. 2, the tooth layer component 2 shown in FIG. 3, and the back layer component 3 shown in FIG. 4 are used. Below, these components are demonstrated.

(Core layer parts)
The core layer component 1 has a sheet shape. The core layer component 1 is a component used as a core layer of a toothed belt, and includes a plurality of core cords 1a and a covering portion 1b that covers the core cords 1a.

The lower limit of the average width of the core layer part 1 is preferably 5 mm, and more preferably 10 mm. On the other hand, the upper limit of the average width of the core layer component 1 is preferably 100 mm, and more preferably 50 mm. If the core layer component 1 is less than the lower limit, the number of core layer component feeding devices to be described later increases, and the effect of suppressing the increase in cost of the manufacturing apparatus may be insufficient. Moreover, there exists a possibility that manufacture of the said core body component 1 may become difficult. Conversely, if the core layer component 1 exceeds the upper limit, the degree of freedom in selecting the average width of the toothed belt determined by the number of parallel core layer components 1 may be reduced.

The lower limit of the average thickness of the core layer part 1 is preferably 0.3 mm. On the other hand, the upper limit of the average thickness of the core layer component 1 is preferably 3 mm. If the average thickness of the core layer component 1 is less than the lower limit, the core layer component 1 is insufficient in strength, so that the plurality of core cords 1a are not sufficiently fixed, and the plurality of core bodies are not fixed. There is a risk that it may be difficult to control the tension between the cords 1a and the embedding depth. On the contrary, if the average thickness of the core layer component 1 exceeds the upper limit, the thickness of the toothed belt to be manufactured becomes too large, and the flexibility of the toothed belt may be insufficient. .

The core layer part 1 is cut after being manufactured as a toothed belt, and is configured as an endless belt having a desired length, for example. For this reason, the average length of the core body layer component 1 is not particularly limited as long as it can be incorporated into the core body layer feeding device, and can be, for example, 0.1 m or more and 10 m or less.

The core cord 1a is a linear body having a substantially circular cross section. Although it does not specifically limit as a main component of the said core code | cord | chord 1a, For example, steel, aramid, carbon, glass, polyester etc. can be mentioned.

The cross-sectional diameter of the core cord 1a is not particularly limited, but is generally 0.2 mm or more and 2.5 mm or less. The length of the core cord 1a is substantially equal to the average length of the core layer component 1.

The number of the core cords 1a is appropriately determined from the average width of the core layer part 1 and the pitch between the cords, but the lower limit of the number of the core cords 1a is preferably four. On the other hand, the upper limit of the number of the core cords 1a is preferably 60. If the number of the core body cords 1a is less than the lower limit, the number of core body layer parts 1 required increases, so the number of core body layer part feeding devices increases, and the manufacturing apparatus There is a risk that the effect of preventing the increase in cost will be insufficient. Conversely, if the number of the core cords 1a exceeds the above upper limit, the pitch of the core cords 1a may be reduced, and the flexibility of the toothed belt may be insufficient, or the pitch of the core cords 1a may be ensured. Therefore, the average width of the core layer component 1 is increased, and the degree of freedom in selecting the average width of the toothed belt may be reduced.

The pitch between the core cords 1a is substantially equal. The lower limit of the pitch between the core cords 1a is preferably 0.3 mm. On the other hand, the upper limit of the pitch between the core cords 1a is preferably 5 mm. If the pitch between the core cords 1a is less than the lower limit, the flexibility of the toothed belt may be insufficient. On the contrary, if the pitch between the core cords 1a exceeds the upper limit, the effect of improving the strength, durability, drive accuracy, etc. of the belt by the core cords may be insufficient.

Of the plurality of core cords 1a, the core cord 1a disposed on the outermost side in the width direction of the core layer component 1, and the core layer parallel to and adjacent to the core cord 1a. The average distance from the end surface of the component 1 is preferably approximately half the pitch between the core cords 1a. In this way, when the plurality of core body layer components 1 are arranged so as to be parallel to and in contact with each other in the length direction by setting the average distance to substantially half of the pitch, The pitch between the core cords 1a that are close to each other between the components 1 can be substantially matched with the pitch of the core cords 1a in the core layer component 1. For this reason, when a plurality of the core layer parts 1 are arranged, the pitch control of the core cord 1a can be easily performed with the entire toothed belt.

The main component of the covering portion 1b is a thermoplastic resin. Examples of the thermoplastic resin include thermoplastic polyester, polyamide, and polyurethane. Among them, polyurethane having excellent wear resistance is preferable.

Further, the covering portion 1b may appropriately contain additives such as a crosslinking agent, a plasticizer, and a curing agent depending on the purpose.

The core layer part 1 can be manufactured by, for example, a manufacturing method including a step of performing extrusion molding using a thermoplastic resin composition for forming the covering portion 1b. By producing the core layer component 1 by extrusion molding in this way, the core layer component 1 in which a plurality of core cords 1a are arranged so that the distances from the surface are substantially equal can be relatively easy. Obtainable.

Specifically, the core layer part 1 covers the both sides with a molten thermoplastic resin composition while inserting a plurality of core cords 1a through a crosshead attached to a cylinder tip of an extruder. It can be manufactured by extrusion.

Further, the core layer 1 is embedded in the thermoplastic resin composition by sandwiching and pressing the melt-extruded thermoplastic resin composition and the plurality of core cords 1a with a pair of rolls. Parts 1 may be manufactured.

Although the heating temperature for melting the thermoplastic resin composition in the extrusion molding depends on the type of resin, the presence or absence of the use of a curing agent, etc., the lower limit of the heating temperature is preferably 150 ° C. On the other hand, the upper limit of the heating temperature is preferably 250 ° C. If the heating temperature is less than the lower limit, the thermoplastic resin composition is not sufficiently melted, and extrusion molding may be difficult. On the other hand, when the heating temperature exceeds the upper limit, the extruded product becomes unnecessarily hot, so that the cooling time becomes unnecessarily long, and the manufacturing efficiency of the core layer component 1 may be reduced.

(Tooth layer parts)
The tooth layer component 2 includes a sheet-like base portion 2a and a plurality of tooth portions 2b disposed on one surface of the base portion 2a and provided at substantially equal intervals in the transport direction.

The average width of the base portion 2a is appropriately determined depending on the number of core layer component parts 1 arranged on the surface of the tooth layer component 2, and can be, for example, 25 mm or more and 400 mm or less.

The average thickness of the base 2a is appropriately determined depending on the strength required for the toothed belt to be manufactured, and can be, for example, 1 mm or more and 10 mm or less.

The average length of the base portion 2a is not particularly limited, but may be substantially equal to the average length of the core layer component 1 from the viewpoint of manufacturing efficiency of the toothed belt.

The tooth part 2b is a convex part having a substantially trapezoidal shape, a triangular shape, a semicircular shape, a mountain shape, a waveform, a normal distribution curve shape, or the like. Further, the tooth portion 2b is disposed so that the ridge line (axial direction) thereof substantially coincides with the width direction of the base portion 2a.

The average height of the tooth part 2b and the pitch between the tooth parts 2b are appropriately determined according to the application. The average height of the tooth portion 2b can be, for example, 1.0 mm or more and 10 mm or less. Moreover, the pitch between the tooth parts 2b can be 2 mm or more and 25 mm or less, for example.

As a main component of the tooth layer component 2, resins such as polyester, polyamide, and polyurethane can be exemplified. These resins are preferably thermoplastic. By making the resin thermoplastic, the adhesive force by thermal welding between the tooth layer component 2 and the core layer component 1 is improved. Of these, thermoplastic polyurethanes that exhibit stable wear resistance over a long period of time are preferred.

The tooth part layer part 2 can be manufactured by a manufacturing method including an extrusion process and a tooth part forming process, for example.

In the extrusion molding step, the resin composition for forming the tooth layer component 2 is extruded using a known melt extrusion molding machine. Thereby, an extrusion-molded product is obtained. This extruded product is in the form of a sheet.

In the tooth portion forming step, the tooth portion 2b is formed on the extruded body after the extrusion step. Specifically, for example, by preparing a cylindrical mold roll having a concave portion corresponding to the tooth portion on the outer peripheral surface, and winding one surface of the extruded product around the mold roll, the tooth portion Form. The heating temperature is appropriately determined according to the temperature at which the extruded product is melted to form a tooth portion on one surface, and can be, for example, 150 ° C. or higher and 250 ° C. or lower.

(Back layer parts)
The back layer component 3 is a flat sheet-like component that does not have a tooth portion or a core cord.

The average width of the back layer component 3 is appropriately determined depending on the number of the core layer components 1 in parallel, and can be, for example, 25 mm or more and 400 mm or less.

The average thickness of the back layer component 3 is appropriately determined depending on the strength required for the conveying surface of the toothed belt, and can be, for example, 0.2 mm or more and 6 mm or less.

The average length of the back layer component 3 is not particularly limited, but may be substantially equal to the average length of the core layer component 1 from the viewpoint of manufacturing efficiency of the toothed belt.

The main component of the back layer component 3 can be the same as the main component of the tooth layer component 2.

The back layer component 3 can be manufactured, for example, by a manufacturing method including an extrusion process. Specifically, the back layer component 3 is manufactured by extruding a resin composition for forming the back layer component 3 using a known melt extrusion molding machine.

<Toothed belt manufacturing equipment>
In the toothed belt manufacturing method, for example, a toothed belt manufacturing apparatus shown in FIG. 5 can be used. The toothed belt manufacturing apparatus includes a core layer component feeding device 4, a tooth layer component feeding device 5, a back layer component feeding device 6, a heater 7, a mold roll 8, a nip roll 9, and a feeding roll. 10 is mainly provided.

The core layer component feeding device 4 is a device for feeding the core layer component 1. As the core layer component feeding device 4, a known feeding device can be used. For example, the core layer component 1 wound in a roll shape is sent out by rotating in a direction opposite to the winding direction. Configured as follows. Further, the core layer component feeding device 4 can adjust the tension of the core layer component 1 by adjusting the rotational torque thereof, and adjust the tension of the core cord in the toothed belt to be manufactured. it can.

The number of core layer component feeding devices 4 is determined by the number of core layer components 1 arranged in parallel, but is one or more for the production of one toothed belt. It is 4 in the manufacturing apparatus of the attached belt. These four core layer component feeding devices 4 are arranged so as to supply the core layer component 1 in parallel to a mold roll 8 to be described later and so as to be relatively close to the mold roll 8. The In addition, the width | variety of a toothed belt is decided by the parallel number and average width of the components 1 for core body layers.

The tooth layer component feeding device 5 is a device for feeding the tooth layer component 2. The tooth layer component feeding device 5 can be configured in the same manner as the core layer component feeding device 4. The number of the tooth part layer component feeding devices 5 is one for the production of one toothed belt. The tooth layer component feeding device 5 is relatively close to the mold roll 8 so that the tooth layer component 2 can be supplied between the core layer component 1 and the mold roll 8. It is arranged as follows.

The back layer component feeding device 6 is a device for feeding the back layer component 3. The back layer component feeding device 6 can be configured in the same manner as the core layer component feeding device 4. The number of rear layer component feeding devices 6 is one for the production of one toothed belt. Further, the back layer component feeding device 6 is capable of supplying the back layer component 3 to the surface of the core layer component 1 opposite to the mold roll 8 and relatively close to the mold roll 8. Is arranged.

The heater 7 includes the core layer component feeding device 4, the tooth layer layer component feeding device 5, and the back layer component feeding device 6, and the core layer layer component 1, the tooth layer layer component 2, and the back surface. It is a heater that heats the layer part 3 and melts at least the surface of the core layer part 1. As the heater 7, for example, a known resistance heater can be used. The heater 7 is disposed between the core layer component feeding device 4, the tooth layer component feeding device 5 and the back layer component feeding device 6, and a mold roll 8 and a nip roll 9 described later. If there is, it is not particularly limited, but the vicinity of the mold roll 8 and the nip roll 9 is preferable. By disposing the heater 7 in the vicinity of the mold roll 8 and the nip roll 9, the core roll part 1, the tooth layer part 2, and the back layer part 3 are heated immediately after the mold roll 8 and Pressure can be applied by the nip roll 9. Further, the arrangement position of the heater 7 is not particularly limited as long as the surfaces of the core layer component 1, the tooth layer component 2, and the back layer component 3 can be heated. A position where both surfaces of the component 1 are heated is preferable. In the toothed belt manufacturing apparatus of FIG. 5, two heaters 7 for heating both surfaces of the plurality of core body layer components 1 are disposed. One heater 7 heats the respective surfaces where the core layer component 1 and the tooth layer component 2 are fused, and the other heater 7 connects the core layer component 1 and the back layer component 3. Each surface to be fused is configured to be heated. With this configuration, the temperature of each component can be controlled with a small number of heaters.

The mold roll 8 is a roll having a recess that can be fitted with a tooth portion of a toothed belt to be manufactured. The nip roll 9 is fed by the core layer component feeding device 4, the tooth layer component feeding device 5, and the back layer component feeding device 6 and heated by the heater 7. The tooth layer component 2 and the back layer component 3 can be sandwiched between the mold rolls 8. The mold roll 8 and the nip roll 9 are configured to weld the core layer part 1, the tooth layer part 2 and the back layer part 3 by pressing to form the toothed belt 11. Yes.

The pressed toothed belt 11 is fed by a mold roll 8. While being fed by the mold roll 8, the toothed belt 11 is cooled and its shape is stabilized. The cooling method of the toothed belt 11 is not particularly limited, and examples thereof include natural cooling at room temperature, air cooling by air blowing, and water cooling for cooling the mold roll 8 itself with water or the like.

The delivery roll 10 is a roll for collecting the toothed belt 11 sent from the mold roll 8 from the mold roll 8 and sending it to a winding device for the toothed belt 11, for example. The position of the delivery roll 10 is not particularly limited as long as it is cooled to such an extent that the shape of the toothed belt 11 formed through the nip roll 9 is stabilized. For example, in the toothed belt manufacturing apparatus of FIG. 5, the feed roll 10 is disposed at a position symmetrical to the nip roll 9 with respect to the center of the mold roll 8.

Hereinafter, the manufacturing method of the toothed belt will be described using the above-described toothed belt manufacturing apparatus.

<Preparation process>
In the preparation step S1, a core layer component 1, a tooth layer component 2, and a back layer component 3 are prepared. Specifically, the core layer component 1, the tooth layer component 2, and the back layer component 3 manufactured in advance are used as the core layer component feeding device 4, the tooth layer component feeding device 5, and the back surface. Set in the layer component feeding device 6. Alternatively, the core layer component 1, the tooth layer component 2, and the back layer component 3 may be supplied to each feeding device while being manufactured. Since the toothed belt can be continuously manufactured from the thermoplastic resin composition by supplying each part while manufacturing the part in this way, the manufacturing cost for managing each part can be reduced.

<Heat welding process>
In the thermal welding step S2, the core layer component 1, the tooth layer component 2, and the back layer component 3 are thermally welded.

First, a core layer component feeding device 4, a tooth layer layer component feeding device 5 and a back layer component feeding device 6 fed by a heater 7 from a core layer component feeding device 4, a tooth layer layer feeding device 6, and a back surface layer component 2 The layer part 3 is heated to melt at least the surface of the core layer part 1. In addition to the surface of the core layer component 1, in addition to the surface of the core layer component 1, the surface of the tooth layer component 2 and the back layer component 3 on the core layer component 1 side may be melted.

The heating temperature of the heater 7 is at least a temperature at which the thermoplastic resin of the core layer component 1 is melted. Specifically, the lower limit of the heating temperature of the heater 7 is preferably 150 ° C. On the other hand, the upper limit of the heating temperature is preferably 250 ° C. If the heating temperature is less than the lower limit, the thermoplastic resin is not sufficiently melted, and the welding between the core layer component 1 and the tooth layer component 2 or the back layer component 3 may be insufficient. There is. Conversely, if the heating temperature exceeds the upper limit, the core layer component 1, the tooth layer component 2, and the back layer component 3 become unnecessarily hot and may be deformed.

After the heating, the core layer component 1, the tooth layer component 2, and the back layer component 3 are overlapped. Specifically, the tooth layer component 2 is fitted so that the surface having the tooth portion 2 b is on the surface side of the mold roll 8 and the tooth portion 2 b is fitted to the recess of the mold roll 8. It is sandwiched between the mold roll 8 and the nip roll 9. Further, the tooth layer component 2 and the nip roll are arranged so that the plurality of core layer components 1 are juxtaposed along the longitudinal direction on the surface opposite to the surface having the tooth portion 2b of the tooth layer component 2. 9 between. Further, the back layer component 3 is sandwiched between the core layer component 1 and the nip roll 9 so as to overlap the surface of the tooth layer component 2 opposite to the surface having the teeth 2b. Thus, by sandwiching the core layer component 1, the tooth layer component 2, and the back layer component 3 between the mold roll 8 and the nip roll 9, the core layer component 1, the tooth layer layer The component 2 and the back layer component 3 can be overlaid.

Next, the core layer component 1, the tooth layer component 2 and the back layer component 3 are thermally welded by pressing them with the mold roll 8 and the nip roll 9. The pressurization is not particularly limited as long as the core layer component 1 and the tooth layer component 2 can be heat-welded, and can be, for example, 5 N / mm or more and 50 N / mm or less per belt unit width.

After the heat welding, cooling is performed to stabilize the shape, and if necessary, the end portion is cut to prepare the toothed belt 11 as shown in FIG. The toothed belt 11 includes a core layer 11 a formed by a plurality of core layer components 1, a tooth layer 11 b formed by a tooth layer component 2, and a back surface formed by a back layer component 3. A layer 11c is provided. That is, the toothed belt 11 includes a core body layer 11a that includes a plurality of core body cords and a coating layer that mainly covers a thermoplastic resin and covers the core body cord, and one of the core body layers 11a. A tooth layer 11b having a plurality of teeth provided on the surface side and provided at substantially equal intervals in the conveying direction, and a sheet-like back layer 11b provided on the opposite surface side of the core layer 11a. With.

The average thickness of the toothed belt 11 is substantially equal to the sum of the average thicknesses of the core layer component 1, the tooth layer component 2, and the back layer component 3, and can be, for example, 1 mm or more and 20 mm or less. Here, the average thickness of the toothed belt means the average thickness from the bottom surface of the tooth portion of the tooth layer to the upper surface of the back surface layer.

The average width of the toothed belt 11 is determined by the parallel number of the core layer parts 1 and is, for example, 25 mm or more and 400 mm or less.

<Advantages>
The manufacturing method of the toothed belt uses the core layer component 1 having a plurality of core cords 1a and a covering portion 1b that covers the core cords 1a. That is, one core layer component 1 has a plurality of core cords 1a. For this reason, the manufacturing method of the said toothed belt can reduce the feeding apparatus for arrange | positioning the components 1 for core layer layers from the number of the core cord 1a. The core layer component 1 can be manufactured by coating the core cord 1a with a thermoplastic resin, and therefore can be prepared relatively easily and inexpensively. Therefore, the manufacturing method of the toothed belt can suppress an increase in cost of the manufacturing apparatus. In the toothed belt manufacturing method, a plurality of core cords 1a of the core layer component 1 are fixed in advance with a thermoplastic resin. For this reason, the manufacturing method of the said toothed belt can adjust collectively the tension | tensile_strength and embedding depth of the some core cord 1a which the component 1 for one core body layer has. Thereby, the manufacturing method of the toothed belt can make the number of controlled objects smaller than the number of core cords 1a. Therefore, the manufacturing method of the toothed belt can suppress variations in the tension and the embedding depth of the core body cord 1a as compared with the case where the control is performed in units of the core body cord.

Moreover, since the manufacturing method of the said toothed belt heat-welds the components 3 for back layers, and the components 1 for core layers, the conveyance surface of the toothed belt 11 manufactured is smoothed. Moreover, the manufacturing method of the said toothed belt can shorten manufacturing time by using the core part component 1, the tooth part layer component 2, and the back layer component 3 manufactured in advance.

[Other Embodiments]
The present invention is not limited to the above-described embodiment, and can be implemented in a mode in which various changes and improvements are made in addition to the above-described mode.

In the above embodiment, the case where the back layer component is placed on the surface of the core layer component and thermally welded has been described. However, the placement and thermal welding of the back layer component are not essential constituent requirements. In the case where the rear layer component placement and thermal welding are not performed, the rear layer component feeding device can be omitted in the manufacturing apparatus of FIG. Thereby, the manufacturing cost can be further reduced. In addition, the conveyance surface of a toothed belt when arrangement | positioning and thermal welding of the components for back layers are abbreviate | omitted becomes one surface of the components for core layer.

In the above-described embodiment, the case where a plurality of core layer components are used has been described. However, the number of core layer components may be one.

The toothed belt manufacturing method of the present invention can relatively easily suppress variations in core cord tension and embedment depth while suppressing an increase in the cost of the manufacturing apparatus. In addition, by using the core layer part of the present invention, it is possible to relatively easily suppress variations in the tension of the core cord and the embedment depth while suppressing an increase in the cost of the manufacturing apparatus. Manufacturing time can be shortened. Moreover, the manufacturing method of the core body layer component according to the present invention can relatively easily suppress variations in the tension and embedment depth of the core body cord.

DESCRIPTION OF SYMBOLS 1 Core body part 1a Core body code 1b Cover part 2 Tooth part layer part

2a Base part

2b Tooth part 3 Back layer part 4 Core layer part feeding apparatus 5 Tooth layer part feeding apparatus 6 Back layer part Feeder 7 Heater 8 Mold roll 9 Nip roll 10 Feed roll 11 Toothed belt 11a Core body layer 11b Tooth layer 11c Back layer

Claims

A manufacturing method of a toothed belt in which core cords are embedded at substantially equal intervals in the width direction,
A plurality of core cords, a sheet-shaped core layer part covering the core cords and having a covering portion mainly composed of a thermoplastic resin, a sheet-like base, and one surface of the base A step of preparing a tooth layer component having a plurality of teeth disposed and arranged at substantially equal intervals in the conveying direction;
Heat-welding one or a plurality of the core layer components to the surface opposite to the surface on which the tooth portions of the tooth layer components are provided.
In the preparation step, further preparing a sheet-like component for the back layer,
2. The toothed belt according to claim 1, wherein in the thermal welding step, the back layer component is further thermally welded to a surface side opposite to a surface on which the tooth layer component of the core layer component is disposed. Production method.
The method for manufacturing a toothed belt according to claim 1 or 2, wherein the preparation step includes a step of forming a core layer part by extrusion of a thermoplastic resin composition.
A component used as a core layer of a toothed belt in which a core cord is embedded at substantially equal intervals in the width direction,
A core layer component that includes a plurality of core cords and a coating portion that covers the core cords and has a thermoplastic resin as a main component.
Used as a core layer of a toothed belt in which a core cord is embedded at substantially equal intervals in the width direction, and covers a plurality of core cords and the core cord, and a thermoplastic resin as a main component A method for manufacturing a core layer component having a portion,
A method for producing a core layer part comprising a step of extruding a thermoplastic resin composition.