JP3561454B2 - Conveying belt and method of forming the same - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention mainly relates to a conveyor belt having a holding portion protrudingly provided on an outer peripheral surface side of a belt main body for holding an ink carriage of a printer or the like, and a molding method thereof .
[0002]
[Prior art]
The ink carriage and the like of the printer are provided so as to be movable in the left-right direction in order to print on the recording paper. As this moving mechanism, an inkless carriage is provided on an endless belt stretched between a pair of pulleys. A carriage is attached to the section, and the carriage is moved left and right by driving a pulley. The holding portion for engaging and holding the carriage is generally made of the same material as the rubber belt main body in consideration of the position control of the carriage and the vibration damping function at the time of driving stop, Since the holding part is located at one or two places on the outer peripheral surface of the main body of the belt, due to the problem of moldability, conventionally, the holding part is molded separately from the main body of the belt, and the two parts are bonded together to complete Goods.
[0003]
[Problems to be solved by the invention]
However, since the printer carriage is frequently driven and stopped by the printing operation, it is likely to be subjected to an impact at the time of driving and stopping, and if the frequency of use is increased, the carriage is separated from the adhesive portion between the belt main body and the holding portion. Alternatively, there has been a drawback that the fracture is likely to occur and the durability is lacking.
[0004]
In order to solve this, it is conceivable to increase the joint area between the holding portion and the belt main body. However, if the joint area between the two increases, the belt rigidity at the joint portion increases. However, in a small printer or the like, a small carriage moving mechanism is used due to space limitations, and the carriage holding unit may move around a pulley having a small number of teeth. Under such circumstances, as described above, when the joint area between the holding portion and the belt main body is large and the rigidity at the portion is high, a jumping phenomenon occurs in which the tooth portion of the belt skips the tooth portion of the pulley. This may hinder the position control of the carriage.
[0005]
Therefore, it is most desirable that the width of the connecting portion of the holding portion with the belt main body be a width that does not cause a jumping phenomenon and that the belt structure improves the durability of the holding portion.
[0006]
[Means for Solving the Problems]
Therefore, the present inventors have improved the durability of the connecting portion between the holding portion and the belt main body by adopting an integral molding method in which the strength is increased by crosslinking rather than physical adhesion.
[0007]
In this case, the belt main body may be either a flat belt having no toothed portion on the inner peripheral surface or a timing belt having a toothed portion on the inner peripheral surface. It is preferable to apply the present invention to a timing belt that can solve the above-mentioned durability at once. Of course, the belt connecting portion of the holding portion needs to be rigid so as not to cause a jumping phenomenon, and the width of the root portion (neck portion) of the holding portion which solves this problem is about one tooth of the toothed portion. It is desirable to suppress.
[0008]
As a molding method for integrally molding the belt main body and the holding portion, various molding methods such as injection, transfer, or compression molding can be adopted.However, when forming a toothed portion with a canvas on the inner peripheral surface of the belt, When burying the core wire inside the belt, unvulcanized rubber is wrapped around the inner mold in advance, and the inner mold is loaded with the opened outer mold having a split mold structure. A compression molding method in which the main body and the holding portion are integrally molded is preferable.
[0009]
In this case, since a plurality of deaeration holes are formed along the mating surface of the outer mold of the split mold structure in order to remove air in the cavity, the holding portion is formed at a position corresponding to the plurality of deaeration holes. By using the inner deaeration hole closest to the cavity and forming this part in a concave part that matches the shape of the desired holding part, the holding part can be easily molded and sufficient strength can be ensured. Can be.
[0010]
The shape of the holding portion may be formed into various shapes according to the shape of the engaging portion of the carriage, but the diameter of the neck portion serving as the connecting portion on the outer peripheral surface side of the belt as compared with the head portion on the tip side of the holding portion is different. In the case of forming a small holding portion, it is particularly preferable to form the holding portion forming portion by using a deaeration hole in the mating surface of the split mold.
[0011]
Further, if a canvas for reinforcement is attached to the outer peripheral surface of the holding portion, the durability of the holding portion can be further improved. In this case, it is preferable that the end of the canvas has a length from the root (neck) of the holding portion to the outer peripheral surface of the belt main body. Further, when the canvas is integrally attached at the time of forming the belt, In this case, a configuration is preferable in which the adhesive is attached to the entire outer peripheral surface of the belt main body and the outer peripheral surface of the holding portion. However, it is sometimes difficult to cover the outer surface of the unvulcanized rubber sheet with a cylindrical canvas when forming a belt with a short circumference.Therefore, a method of winding a long canvas over the unvulcanized rubber sheet is used. It is preferred to employ it. In this case, if at least the neck portion of the holding portion is covered with canvas, the holding portion can be formed into a desired shape and the durability of the holding portion can be sufficiently ensured.
[0012]
From the viewpoint of ensuring the reliability and durability of the belt, a configuration in which a core wire is embedded in the rubber portion of the belt main body is preferable, and in order to prevent wear of the toothed portion on the inner peripheral surface of the belt main body. In this case, a configuration in which a canvas is stuck to the toothed portion can be adopted.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a side view of a belt 1 with a holding portion showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view of a portion A of FIG. 1, and FIG. 3 is an enlarged sectional view of a portion B of FIG. As shown in the drawing, the belt 1 with a holding portion has a holding portion 10 protruding from an outer peripheral surface of an annular belt main body 3, and the belt main body 3 has a large number of toothed portions 5 formed on an inner peripheral surface thereof. The main body 6 is embedded in a rubber portion of the belt main body 3, and canvases 7, 8 are attached to the inner peripheral surface (toothed portion 5) and the outer peripheral surface of the belt.
[0014]
The toothed portion 5 is formed of a convex portion formed along the belt width direction, and is formed in a uniform number in the circumferential direction (longitudinal direction) of the belt, and is provided so as to mesh with the pulley 15 as shown in FIG. Have been.
[0015]
The inner peripheral side fabric 7 has a thickness of 3 mm that extends in the circumferential direction so that the convex portions 5 and the like can be formed at the time of vulcanization molding of rubber and that the flexibility of the belt is ensured. Nylon canvas is formed into a cylindrical shape by sewing, welding (for example, ultrasonic welding) or the like.
[0016]
The outer fabric 8 is made of the same material as the inner fabric 7. However, in order to reliably form the holding portion 10 by compression molding, the long fabric is made of unvulcanized rubber. And vulcanization molding.
[0017]
The core wire 6 buried inside the belt is made of a cord body such as glass fiber, steel fiber, or aluminized fiber, and is tightly wound around a canvas 7 on the surface of the toothed portion 5. Various rubber materials can be used for the rubber constituting the belt main body 3 according to required characteristics, and examples thereof include CR (chloroprene rubber) and NR (natural rubber).
[0018]
The holding portion 10 is provided so as to protrude from the outer peripheral surface of the belt main body 3 for mounting a printer carriage, and is formed integrally with the belt main body 3. As shown in FIG. 3, the holding portion 10 has a neck portion 11 serving as a connecting portion with the belt main body 3 formed to have a smaller diameter than the head portion 12 at the front end. The head 12 functions as a mounting part (not shown) and as a retaining part.
[0019]
FIG. 4 is an enlarged sectional view of a main part of the molding die 20 in a clamped state. As shown in the figure, the molding die 20 has a cavity 21 in which a main body forming part 22 for forming the belt main body 3 and a holding part forming part 23 for forming the holding part 10 are continuously provided at the time of mold clamping. is there. Grooves corresponding to the shape of the toothed portion 5 are formed on the outer peripheral surface of the inner mold 24 constituting the inner surface of the main body forming portion 22.
[0020]
The outer surface of the main molding part 22 and the outer mold 25 constituting the holding part molding part 23 have a pair of split mold structures which can approach and separate from each other, and a deaeration hole 27 for releasing air in the cavity 21 at the time of molding. Is formed, and the innermost deaeration hole is used as the holding part forming part 23. The holding part forming part 23 is formed in a concave shape on the mating surface 25 a of the outer mold 25 so as to face the main part forming part of the cavity 21.
[0021]
In order to manufacture the belt 1 with the holding portion 10, first, the cylindrical inner mold 24 is covered with a cylindrical canvas 7 extending in the circumferential direction, and the core wire 6 is wound thereon. The sheet 4 is wound, and a long canvas 8 which is also extended in the circumferential direction is wound around the sheet 4. Then, the inner mold is loaded on the outer mold so that the end of the canvas on the outer peripheral side is positioned on the mating surface of the outer mold, and the pair of outer molds 25 are brought close to each other to perform mold clamping as described above. The compact is vulcanized under heat and pressure.
[0022]
In the vulcanized molded body, the rubber penetrates into the inner canvas 7 through the core wire 6 and presses the canvas 7 against the groove, so that the vulcanized molded body 2 having the toothed portion 5 formed on the inner surface is obtained. In addition, a part of the rubber wound around the inner mold 24 escapes along the split mold mating surface 25a of the outer mold 25 together with the canvas 8 at the time of pressure molding, and the surplus rubber also enters the holding portion molding portion 23. The vulcanized molded body 2 which has penetrated and integrally molded the holding portion 10 is obtained.
[0023]
When entering the holding part forming part 23, the surplus rubber presses the outer canvas 8 against the outer mold 25 side, so that a molded body in which the canvas 8 is stuck on the surface of the holding part 10 can be obtained. The molded vulcanized molded product is separated from the molding die 20, subjected to a process such as surface polishing, and then cut to a desired belt width by a cutter device to obtain a finished product.
[0024]
The belt 1 with a holding portion manufactured as described above is used by being suspended by a pulley 15 and a carriage for a printer attached to the holding portion 10. And a sufficient strength about 10 times as high as the adhesive strength of the above, and is excellent in durability.
[0025]
In addition, the elongation of the belt in the circumferential direction is regulated by the core wire 6, and the strength in the circumferential direction is sufficiently ensured. Further, since the canvas 7 is present on the inner peripheral surface in contact with the pulley 15, the generation of rubber powder can be prevented. Further, since the holding portion 10 is covered with the canvas 8, generation of rubber powder due to friction with the printer carriage can be prevented.
[0026]
It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that many modifications and changes can be made within the scope of the present invention. For example, the holding portion is not limited to one location on the outer peripheral surface of the belt main body 3 and may be formed at a plurality of locations. Also in this case, the outer mold has a split mold structure, and the holding portion forming portion is set on the mating surface. What should I do?
[0027]
【The invention's effect】
As is clear from the above description, according to the present invention, by integrally molding the holding portion and the belt main body, a sufficient strength is obtained at the joint between the holding portion and the belt main body, and the durability of the belt is improved. Can be achieved.
[Brief description of the drawings]
1 is a side view of a belt with a holding portion according to an embodiment of the present invention; FIG. 2 is an enlarged sectional view of a portion A in FIG. 1; FIG. 3 is an enlarged sectional view of a portion B in FIG. 1; Enlarged sectional view of the main part of the forming die of the belt with part [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Belt with holding part 3 Belt main body 5 Toothed part 6 Core wire 7, 8 Canvas 10 Holding part 11 Neck 12 Head 20 Mold 21 Cavity 22 Main part forming part 23 Holding part forming part 24 Inner mold 25 Outer mold 27 Deaeration hole

Claims (2)

On the outer peripheral surface side of the belt main body having a toothed portion on the inner peripheral surface, in order to hold a printer carriage or the like, a neck portion serving as a connection portion with the belt main body and a head at the tip thereof are configured, and the neck portion is formed. A method of forming a conveyor belt that integrally forms a holding portion formed to have a smaller diameter than a head ,
On the inner mold having a groove corresponding to the shape of the toothed portion on the outer peripheral surface, cover a cylindrical canvas extending in the circumferential direction, wind a core wire thereon, further wind an unvulcanized rubber sheet, A long elongate canvas stretched in the circumferential direction is wrapped around the outside, and then the outer mold has a pair of split mold structures that are open and has a holding portion forming portion formed in a concave shape on the mating surface. The inner mold is loaded so that the end of the canvas on the outer peripheral side thereof is positioned at the mating surface of the outer mold, the pair of outer molds are brought close to each other, and the mold is clamped. molding process of the conveyor belt, which comprises adhering together wrapped all peripheral surface and outer peripheral surface elongated reinforcing canvas of the holding portion of the belt main body when integrally forming the holding portion on the outer peripheral surface of the. A conveying belt formed by the forming method according to claim 1.

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