JPS6339788A - Bias cutting method and device for baggy raw fabric - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a bias cutting method and apparatus for forming a strip-shaped raw fabric by cutting a bag-shaped raw fabric at a predetermined angle (particularly an acute angle).

[Conventional technology]

As shown in Figure 9 (A), plain woven fabric in which warp threads a and weft threads are plain woven in a lattice pattern is used as a reinforcing material for rubber layers in automobile tires and belts, but this (7) 81 cv A plain woven fabric lacks elongation in the machine direction V and the transverse direction H unless the warp threads a and the weft threads themselves have stretchability.

Although the warp and weft threads of the plain woven fabric used for such applications have some degree of elongation, they do not have much elongation, so the plain woven fabric used as a reinforcing material deforms to follow the deformation of the tire. If the belt is wrapped around a small diameter pulley that has been frequently used in recent years, the plain woven fabric may not be able to fully follow the deformation of the belt.In such cases, the plain woven fabric may break and the reinforcement It may become impossible to fulfill its function as a material.

In order to deal with this situation, a raw fabric made by sewing plain woven fabric into a bag shape (hereinafter referred to as a bag-shaped raw fabric) is cut into a strip shape by cutting it spirally (such cutting is referred to as bias cutting). Form the original fabric and use this material. In this strip-shaped raw fabric, warp threads a and weft threads are aligned in the longitudinal direction V and the transverse direction H of the raw fabric, as shown in Fig. 9(B). Because of the inclination, even if the warp yarns d and the weft yarns themselves do not have extensibility, the original fabric has extensibility in the machine direction V and the cross direction H.

Therefore, when a belt-shaped raw fabric formed by bias cutting a bag-shaped raw fabric is used as the reinforcing material, the occurrence of a situation in which the reinforcing material breaks due to deformation of the tire or belt is suppressed.

[Problem that the invention seeks to solve]

By the way, the ideal belt-like material used as a reinforcing material for tires and belts has a mechanical angle of 18 mm with respect to the warp of the bag-like material, that is, the threads woven in the longitudinal direction of the bag-like material.
It is known that this was a bias cut.

However, when bias cutting a bag-shaped raw fabric, the smaller the cutting angle with respect to the warp (hereinafter, this angle is referred to as bias angle θ), the harder the cutting becomes. angle is 4
If the angle was less than 5 degrees, it was impossible to cut.

In other words, the conventional bias cutting device maintains a bag-like raw fabric in a cylindrical shape, cuts it at a predetermined location with a cutter, and cuts the resulting strip-shaped raw fabric in its longitudinal direction (longitudinal direction of the bag-shaped raw fabric). According to this, when the bias angle is 45 degrees,
When the strip-shaped raw fabric is pulled in a direction of 45 degrees, the bag-shaped raw fabric is also rotated and fed in synchronization with this pulling force, and the bag-shaped raw fabric is bias cut without twisting.

However, when trying to perform bias cutting at a bias angle smaller than 45 degrees using conventional equipment, the bag-like material fed to the pull ear cutting device becomes twisted, making it impossible to perform good bias cutting. There was a problem.

This invention enables feeding in a predetermined direction forcibly and synchronously to both the bag-shaped raw fabric and the strip-shaped raw fabric formed by bias cutting, so that the bias angle can be adjusted not only when the bias angle is 45 degrees but also when the bias angle is 45 degrees. To provide a method and an apparatus for automatically and continuously bias-cutting even a strip-shaped original fabric having a bias angle of 18 degrees, which is suitable for reinforcing materials for tires and belts, even if the bias angle is larger or smaller than that. With the goal.

Means for Solving Problem C] In order to achieve the above object, the bias cutting method of the present invention provides a method for cutting a bag-shaped original fabric in the middle of the original fabric feeding path through which the original fabric is passed through while maintaining its shape in a cylindrical shape. In this method, the above-mentioned original fabric is bias cut with a cutter to form a strip-shaped original fabric, and the above-mentioned original fabric is cut at a bias angle with respect to its longitudinal direction in the original fabric feeding path on the front side of the cutter installation location. On the other hand, in the fabric feeding path behind the cutter installation location, a belt-shaped fabric formed by bias cutting is fed with a rotational force in the same direction as the rotational force. It is characterized by feeding only by force and synchronizing the feeding speed of the bag-shaped raw fabric and the feeding speed of the strip-shaped raw fabric.

Further, the bias cutting device of the present invention is provided with a pre-feeding mechanism that feeds the bag-shaped original fabric while applying a rotational force in a direction inclined by a bias angle with respect to the longitudinal direction of the original fabric. A shape-retaining mechanism is disposed around this feeding mechanism, which expands the bag-like raw fabric to maintain its shape in a cylinder and guides the feeding direction of this raw fabric in its longitudinal direction. A cutter that bias-cuts the raw fabric is provided in the middle of the raw fabric feeding path, and behind this cutter, the belt-shaped raw fabric formed by bias cutting is fed only by a force in the same direction as the rotational force. The present invention is characterized in that a second-stage feed mechanism is provided, and the feed rate by the first-stage feed mechanism and the feed rate by the second-stage feed mechanism are synchronized.

[For production]

According to the bias cutting direction and its device of the present invention, the bag-shaped raw fabric whose shape is maintained in a cylinder is forcibly rotated in the raw fabric feeding path on the front side of the cutter installation location, and the bag-shaped raw fabric is rotated by the rotation. Twisting is prevented. Also, at the rear of the cutter installation location, the strip of raw material cut by the cutter is forcibly fed in the longitudinal direction, and the feeding speed is synchronized with the feeding speed of the bag-shaped raw material. The belt-shaped original fabric can be transferred in the longitudinal direction without twisting.

〔Example〕

Hereinafter, an embodiment method and an embodiment apparatus of the present invention will be explained.

FIG. 1 is a schematic plan view of the bias cutting device of the present invention, FIG. 2 is a schematic side view thereof, and FIG. 3 is a perspective view showing the working state of bias cutting. This bias cutting device consists of a front-stage machine stand 1, a rear-stage base 2, a feeding table 3 for bag-shaped raw fabrics, and a processing device 4 for strip-shaped raw fabrics formed by bias cutting.

, a plurality of (four in the illustrated example) front-stage feed mechanisms 5 made of belt conveyors are arranged in the front-stage machine stand 1 in a staggered manner when viewed from above. All of these feeding mechanisms 5... apply a rotational force in a direction inclined by a bias angle θ (see FIG. 9 (El)) to the bag-shaped raw fabric A shown in FIGS. 3 and 4, and This feeds the raw fabric A in the longitudinal direction. In FIG. 1, arrows indicate the direction of the rotational force and the direction of the resultant force of the feeding force. In addition, on the front base 1,
A shape retaining mechanism 6 is provided around the pre-stage feeding mechanism 5. This shape-retaining mechanism 6 includes a dome-shaped tip guide 10 extending between the tips of three parallel rods 7.8. It is configured to rotate inward at high speed as shown by the arrow in Figure 5. Further, as schematically shown in FIG. 4, a plurality of presser rollers are arranged in the second feeder [5...], and a bag-like material kept in a cylindrical shape is The sheet A is forcibly transferred in the direction of the arrow in FIG. 1 while being held between the feed mechanism 5 and the presser roller 11.

Also on the rear stage base 2, a plurality (three in the illustrated example) of rear stage feed mechanisms 12 made of belt conveyors are arranged in different levels in a plan view. These feeding mechanisms 12...
applies only the feeding force in the same direction as the above-mentioned pre-stage feeding mechanism 5 .

A cutter 13 equipped with a rotary blade is provided in the middle of the original fabric feed path X□ formed by the shape retention mechanism 6.

Next, as shown in FIG.
At least one of the two rotating shafts 14.14 provided in No. 2 is common to the rotating shaft 14 of the adjacent rear-stage feed mechanism 12. Further, although not shown, each of the pre-stage feeding mechanisms 5 has a similar configuration. Furthermore, the front stage feed mechanism 5... and the rear stage feed mechanism 12...
. . . has zero or more configurations connected by a transmission means such as a checker 7B, so that the front-stage feed mechanism 5 and the rear-stage feed mechanism 12 are all driven by one motor (not shown), and , the feed rates by all of them are synchronized.

The processing device 4 for processing raw raw material strips 4 includes two feed rollers 18 and 17 arranged side by side in close proximity, and these rollers 1B and 1.
7 and a feed roller 18 arranged at a higher position than them, and these rollers 1B, 1? .

and a motor 19 for driving the motor 18. It should be noted that the motor 18 is also used as a motor for driving the above-mentioned front-stage feed mechanism 5 . . . and rear-stage feeder yi12 .

The feeding table 3 rotatably supports a bag-shaped original fabric holding table 21 on a base 20, and is provided with a feeding roller 22 and an up/down type guide arm 23, and the holding table 21 is of a manual rotation type. It may be a power rotation type.

In this embodiment device, Miki's rod 7.8 is attached to the shape retention mechanism 6.
．． 9 has been explained, but the number of these rods may be two or three or more, and by increasing the number of rods, the bag-shaped raw fabric A can be made into a state closer to a cylinder. Can retain shape. Further, the tip guide lO may have a shape other than the dome shape. A curved wire rod may be provided in between, or other configurations may be used.In short, when the bag-shaped raw fabric A is fed, it can be prevented from getting caught at the end of the shape retaining mechanism 8. It can be anything. As a more preferable configuration for this purpose, shape retention mechanism B
If air is blown into the inside of the bag-shaped raw fabric A from the end of the bag-shaped raw fabric A, and the bag-shaped raw fabric A is made to fill up with air pressure, a reliable effect can be expected.

FIG. 8 illustrates a device for turning the front feed mechanism 5 and the rear feed mechanism 12. That is, in this turning device, a rotary table 41 is rotatably supported on a base 4o, and a bottle 43.43 protruding from the base 4o is inserted into an arcuate guide hole 42.42 formed in the rotary table 41.
It is inset. Note that when changing the bias angle, the front-stage feed mechanism 5 and the rear-stage feed mechanism 12 are turned to an angle corresponding to the bias angle.

Next, an example method will be explained along with the operation of the above device.

The bag-shaped raw fabric A folded into a flat shape is held on the bag-shaped raw fabric holding table 21
The bag-like raw fabric A is fed out from the holding table 21 via the guide arm 23 as shown by the imaginary line as a second factor, and placed over the tip guide tool 10 of the shape-retaining mechanism 6 and placed on the rod 7.8. .9, and at the same time, the front stage feed mechanism 5... and the rear stage feed mechanism 1.
2... is driven. As a result, the bag-like raw fabric A is sent to the fabric feeding mechanism Xl formed by the shape-retaining mechanism 8 in a cylindrical shape-retained state. In this case, shape retention mechanism B
If Miki's rod 7.8 is rotated at high speed in the direction of pulling the lower part of the bag-shaped raw fabric A as shown by the arrow in Fig. 5,
This prevents the bag-shaped raw fabric A from twisting inadvertently, which is convenient for bias cutting. ′! The bag-like raw fabric A sent to the X anti-feed path x1 is applied with a rotational force in a direction inclined by a bias angle θ with respect to its longitudinal direction, and at the same time, the bag-shaped raw fabric A is fed in the longitudinal direction of the bag-shaped raw fabric A. is applied. Therefore, the bag-like raw fabric A is forcibly rotated and sent while being kept in shape by the shape keeping mechanism 6. Moreover, if the bias cutting is continued while simply feeding out the bag-like raw fabric A from the feeding device 3, the bag-shaped raw fabric A will be twisted.
In order to avoid this, the holding stand 21 is rotated in synchronization with the twisting of the bag-shaped raw fabric A. Of course, this rotation may be performed manually or automatically using mechanical power. The bag-like raw fabric A that is fed out from the feeding device 3 is guided by the guide arm 23.
Since the eel delivery position is always set at a constant location, the state of delivery to the shape retaining mechanism 6 is stabilized.

In the middle of the fabric feeding path x1, the bag-shaped fabric A is bias cut by the cutter 13 to form a band-shaped ring. During this belt-shaped ring roll, feed is applied in the longitudinal direction of this belt-shaped raw fabric B by the rear-stage feeding mechanism 12, and no rotational force is applied to the bag-shaped raw fabric A. The direction of the applied rotational force coincides with the direction of the applied rotational force, and the feed speed of the first-stage feed mechanism 5... and the second-stage feed mechanism 12...
Since the feeding speeds of are synchronized, the bag-shaped raw fabric A will not be twisted even if continuous bias cutting is performed.

X2 indicates the original fabric feeding path on the rear side of the installation location of the cutter 13.

The belt-like ring formed by bias cutting is attached to the feed rollers 1B, 1?, as shown in FIGS. 3 and 7. .

18 in a meandering manner and placed on the original fabric table 3o while being folded. In addition, feed roller 1B
Since the presser rod 31 is provided close to the belt, the belt-shaped ring roll is reliably transferred to the original fabric table 30. When winding up the band-shaped ring without folding it, a paper tube may be used instead of the feed roller 17 to wind it up.

〔Effect of the invention〕

As described above, according to the bias cutting method and device of the present invention, the bag-like material kept in a cylindrical shape is forcibly rotated in the material feeding path on the cutting side of the cutter installation location. Since the rotation prevents the bag-shaped raw fabric from twisting, not only bias cutting at 45 degrees but also bias cutting at larger or smaller bias angles can be performed in a stable manner. As a result, it is now possible to efficiently perform bias cutting at an angle of 18 degrees, which is the optimum bias angle for strip-shaped raw materials used as reinforcing materials for tires and for reinforcing belts wrapped around small-diameter pulleys. It's huge.

[Brief explanation of drawings]

Fig. 1 is an overall schematic plan view of an embodiment of the present invention;
The figure is an overall schematic plan view of the device, Figure 3 is a perspective view showing how the device is used, Figure 4 is a schematic diagram of the pre-stage feed mechanism, and Figure 5
The figure is a front view of the shape retention mechanism, Figure 6 is a schematic plan view of the rear feed mechanism, Figure 7 is a schematic side view showing the processing device, and Figure 8 is a schematic diagram showing the turning device of the front feed mechanism and the rear feed mechanism. Hei 1
FIG. m, FIG. 9(A), and FIG. 9(B) are enlarged views for explaining the weaving direction of the original warped warp and weft. A... Bag-shaped raw fabric B... Band-shaped raw fabric Post-stage feed mechanism 13... cutter

Claims (2)

[Claims] (1) A method in which the bag-shaped raw fabric is bias-cutted with a cutter at the middle part of the fabric feeding path in which the fabric is passed through while maintaining its cylindrical shape to form a band-shaped fabric. In the fabric feed path on the front side of the cutter installation location, while applying a rotational force to the fabric in a direction inclined at a bias angle with respect to its longitudinal direction, the fabric is fed while the cutter is installed. In the fabric feed path on the rear side of the point,
A bag-shaped raw material, characterized in that a belt-shaped raw fabric formed by bias cutting is fed only by a force in the same direction as the rotational force, and the feeding speed of the bag-shaped raw fabric and the feeding speed of the belt-shaped raw fabric are synchronized. Anti-bias cutting method. (2) A pre-feeding mechanism is provided that feeds the bag-shaped fabric while applying a rotational force in a direction inclined at a bias angle with respect to its longitudinal direction, and a section around this feeding mechanism is provided. , a shape-retaining mechanism is provided that expands the bag-like raw fabric and maintains its shape in a cylindrical shape while guiding the feeding direction of the raw fabric in its longitudinal direction, and the fabric feeding path formed by this shape-retaining mechanism is A cutter for bias-cutting the raw fabric is provided in the middle, and a post-feeding mechanism is arranged behind the cutter to feed the strip-shaped raw fabric formed by bias cutting using only a force in the same direction as the rotational force. A bias cutting device for bag-shaped raw fabric, characterized in that the feed speed of the first-stage feed mechanism and the feed speed of the second-stage feed mechanism are synchronized.