JP2002086581A - Apparatus for winding core wire for forming transmission belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for winding a core wire for forming a transmission belt capable of winding the wire on an outer periphery of a reinforcing material without twisting the material due to a deviation of the material to wind the wire while retaining the material by a touch pulley. SOLUTION: The apparatus for winding the core wire for forming the transmission belt rotatably drives the wire 4 supplied to the outer periphery of the reinforcing material 1 coating on a die 2 by retaining the wire 4 by the outer peripheral surface of the touch pulley 3 to spirally wind the wire 4 on the outer periphery of the material 1. The pulley 3 has a winding core wire retainer 5 for retaining the wire 4 to be supplied to and wound on the outer periphery of the material 1, and a wound core wire retainer 6 for retaining the wound core wire 4 on the outer periphery of the material 1. A radius r3 of the retainer 6 is formed larger than a radius r1 of the retainer 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a toothed belt and the like.
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device used for winding a core wire around a molding die when forming a power transmission belt in which a core wire is embedded along the longitudinal direction of the belt.

[0002]

2. Description of the Related Art In the manufacture of a power transmission belt such as a toothed belt, for example, the following is performed.
That is, as shown in FIG. 3A, a cylindrical mold 2 formed by providing a large number of concave grooves 11 for forming teeth in the outer periphery in parallel with the axial direction is used. A sheet material such as canvas is covered with a reinforcing material 1 formed in a tubular shape, and then a core wire 4 is spirally wound around the outer periphery of the reinforcing material 1 covered on a mold 2. Thereafter, an unvulcanized rubber sheet 12 is wound on the outer periphery of the reinforcing member 1 from above the core wire 4 and is heated and pressed to be vulcanized to form a cylindrical sleeve. Then, by cutting the sleeve so as to cut it, the teeth 13 whose surface is reinforced by the reinforcing material 1 on one surface are formed at a predetermined pitch as shown in FIG. Can be obtained in the transmission belt T embedded in the belt longitudinal direction.

Here, in order to spirally wind the core wire 4 around the outer periphery of the reinforcing member 1 placed on the mold 2 as described above, a touch pulley is provided as disclosed in Japanese Patent Publication No. 6-92133. 3 are used. The touch pulley 3 is formed in a cylindrical shape, and is rotatable about a shaft 15. The touch pulley 3 is arranged on the outer periphery of the mold 2 so that the shaft 15 is parallel to the rotation shaft 16 of the mold 2 that is driven to rotate, and is moved and driven in parallel with the axial direction of the mold 2. It is so.

FIGS. 4 and 5 show an example of a conventional touch pulley 3. One end of the touch pulley 3 in the axial direction is a wound core presser 5, and the other part in the axial direction is a wound core. Pressing portions 6 are formed respectively. A core wire guide groove 17 is formed in the outer periphery of the wound core wire holding portion 5.
In the drawing, two core wire guide grooves 17 are recessed for use in a double winding in which a pair of S-strand and Z-twist core wires 4 are simultaneously wound. Uses a touch pulley 3 in which one core wire guide groove 17 is provided. Then, in the conventional Tatchipuri 3, the r ₁ (radius at the groove bottom portion of the core wire guide grooves 17) wound cord pressing portion 5 of the radius, and the radius r ₁ of the winding already cord pressing portion 6, equal size It is formed.

When the core wire 4 is spirally wound around the outer periphery of the reinforcing member 1 covered by the mold 2 using such a touch pulley 3, the core wire 4 is supplied to the outer periphery of the reinforcing member 1 covered by the mold 2. The core 2 is driven by rotating the mold 2 as shown by the arrow in FIG. 5 while guiding the core 4 by fitting the core 4 into the core guide groove 17 of the winding core presser 5 of the touch pulley 3. The core wire 4 can be wound around the outer periphery of the reinforcing member 1 while being guided and positioned by the groove 17. At the same time, the touch pulley 3 is moved in parallel with the mold 2 as shown by an arrow in FIG. The position where the core wire 1 is guided by the core wire guide groove 17 can be moved and spirally wound.

Here, the core wire 4 is held in a state where the touch pulley 3 is floated without directly contacting the outer periphery of the reinforcing member 1 placed on the mold 2 without contact.
However, in this method, the arrangement of the wound core wires 4 becomes poor, and the number of the core wires 4 embedded in the obtained transmission belt T varies, and
The dispersion of the strength of the power transmission belt T is increased, and if the core wires 4 are in contact with each other, stress may be generated between the core wires 4 while the belt is running, resulting in cutting.

For this purpose, as shown in FIGS. 4 and 5, the core wire 4 is wound while the touch pulley 3 is pressed against the reinforcing material 1 placed on the mold 2. 4 and 5, reference numeral 4a denotes a core 4 to be wound around the outer periphery of the reinforcing member 1, and reference numeral 4b denotes a core 4 already wound around the outer periphery of the reinforcing member 1. The core wire 4a to be wound is pressed by the core wire guide groove 17 of the winding core wire pressing portion 5 and wound around the outer periphery of the reinforcing member 1, and the core wire already wound around the outer periphery of the reinforcing member 1. 4b is held down by the wound core wire holding section 6. In this manner, the winding is performed in a state where the core wire 4a to be wound and the wound core wire 4b are pressed by the touch pulley 3, respectively, so that the arrangement of the core wires 4 on the outer periphery of the reinforcing member 1 is improved. It is.

[0008]

By pressing the touch pulley 3 against the reinforcing material 1 placed on the mold 2 as described above, the core wires 4 can be spirally wound in a lined manner. Of the reinforcing member 1 placed on the mold 2 by the action of the pressing force caused by the pressing force, the twisting due to the displacement easily occurs. The reinforcing material 1 is formed by sewing a cloth or the like into a cylindrical shape and sewing together end portions thereof. The seam 14 is manufactured so that the seam 14 is positioned at the top of the tooth portion 13 as shown in FIG. For this purpose, the reinforcing member 1 is placed in the mold 2 so that the seam 14 is positioned at the concave groove 11.
However, if the reinforcing material 1 is displaced when the core wire 4 is wound, the seam 14 of the reinforcing material 1 may be displaced from the position of the concave groove 11, and the seam 14 The seam 14 exists at a position, such as a valley between the teeth 13, shifted from the top of the portion 13, and there is a possibility that the transmission belt T having a problem in strength may be manufactured.

Here, when winding the core wire 4, the reinforcing material 1
The principle of occurrence of twisting due to misalignment will be described with reference to FIG.

The touch pulley 3 is not driven to rotate by itself. As shown in FIGS. 4 and 5, a wound core wire holding portion 4b already wound around the outer periphery of the reinforcing member 1 is wound around the core wire holding portion 4b. Due to the pressure contact of the mold 6, the touch pulley 3 is rotated as shown by the arrow in FIG. 5 following the rotational drive of the mold 2, and the core wire 4 a to be wound around the outer periphery of the reinforcing member 1 from now on Is wound around the core wire guide groove 17 of the core wire holding portion 5 within the range of the angle θ. The core wire 4a in contact with the nearest point on the inner mold 2 of the outer circumference of Tatchipuri 3, the points on the surface of 4b and A _0, the winding core wire holding portion 5 of the core wire 4a is Tatchipuri 3 to be Makitsukeyo now Arc A ₀ B ₀ , which is a range wound at an angle θ around the outer circumference of
_The point C ₀ is plotted on the outer surface of the wound core 4b so that ₀ B ₀ = arc A ₀ C ₀ . Also, the intersection of the extension line of the straight line connecting the shaft 15 of the touch pulley 3 and the point A ₀ and the pitch line p of the core wire 4 a to be wound from now on,
Since the intersection of the straight line connecting the rotation axis 16 of the mold 2 and the point A ₀ and the pitch line p of the wound core 4 b coincides in FIG. 5, the intersection is plotted as a point A _{1 and} the axis of the touch pulley 3 is further plotted. The intersection between the extension line of the straight line connecting 15 and the point B ₀ and the pitch line p of the core wire 4a to be wound is plotted as a point B ₁ , and the straight line connecting the rotation axis 16 of the mold 2 and the point C ₀ and plotting the intersection of the pitch line p of the winding already cords 4b as C _1.
Note that the pitch line p of the core wire 4 is substantially at the center of the core wire 4.

Since the radius r ₁ of the wound core wire pressing portion 5 of the touch pulley 3 is equal to the radius r ₁ of the wound core wire pressing portion 6, if there is no slippage between the touch pulley 3 and the core wire 4, the mold 2. Wound core wire 4b rotated with the rotational drive of
And the speed of the outer peripheral surface of the core wire holding portion 5 of the touch pulley 3 is equal, and therefore, the core wire 4 to be wound around which comes into contact with the core wire holding portion 5 is to be wound.
The speed of the inner surface of a and the speed of the outer surface of the wound core wire 4b are equal. That is, [feed speed on the inner surface of the core wire 4a to be wound: feed speed on the outer surface of the wound core wire 4b = arc A ₀ B ₀ : arc A ₀ C ₀ ],
Arc A ₀ B ₀ = arc A ₀ C ₀ .

Here, the feeding of the core wire 4a to be wound is performed.
The feed speed of the wound core wire 4b and the feed speed of the wound core wire 4b.
Comparing the pitch line p which is the length of
[Feeding speed of core wire 4a to be wound: wound
Feeding speed of core wire 4b = arc A₁B₁: Arc A₁C₁]
You. The thickness (diameter) of the core wire 4 is t, and the reinforcing material is added to the mold 2.
1 from the rotation axis 16 at the center of the mold 2
The radius to the outer circumference of 1 is r _TwoThen the arc A₁B₁/arc
A₀B₀= (R₁+ 0.5t) / r₁And the arc A₁C₁/
Arc A₀C₀= (R_Two+ 0.5t) / (r_Two+ T).
Arc A as above₀B₀= Arc A₀C₀Therefore, [Volume
Feeding speed of core wire 4a to be tied: wound core wire
4b feed rate = arc A₁B₁: Arc A₁C₁= (R₁+
0.5t) / r₁: (R_Two+ 0.5t) / (r_Two+ T)]
Becomes the relationship. Generally r_TwoIs r₁Is larger, so (r
₁+ 0.5t) / r₁> (R_Two+ 0.5t) / (r_Two+ T)
And therefore arc A₁B₁> Arc A₁C₁It is. Yo
The feed speed of the core wire 4a to be wound is already wound
It is always faster than the feed speed of the wire 4b.

In this manner, the core wire 4a to be wound is
If the feed speed is higher than the feed speed of the wound core wire 4b, the sent core wire 4a is longer than the fed core wire 4b. That is, it escapes in the rotating direction of the mold 2,
As a result, the reinforcing member 1 is displaced in the rotational direction of the mold 2 and twisting occurs.

The present invention has been made in view of the above points, and when winding a core wire while pressing it with a touch pulley, the core wire is wound around the outer periphery of the reinforcing material without causing the reinforcing material to shift and twist. It is an object of the present invention to provide a core winding device for forming a power transmission belt.

[0015]

SUMMARY OF THE INVENTION According to the present invention, there is provided a metal mold for forming a power transmission belt having a reinforcing member mounted on an outer periphery thereof, and a metal rotatable and rotatable in contact with the outer periphery of the reinforcing member mounted on the mold. A touch pulley 3 that is driven to move along the axial direction of the mold 2, and a core wire 4 that is supplied to the outer periphery of the reinforcing member 1 that covers the mold 2.
By pressing the outer peripheral surface of the touch pulley 3 to rotate the mold 2, the core wire 4 is spirally wound around the outer periphery of the reinforcing member 1. A wound core wire holding portion 5 for holding the core wire 4 supplied to and wound on the outer periphery of the reinforcing member 1 and a wound core wire holding portion 6 for holding the core wire 4 wound around the outer periphery of the reinforcing member 1 are formed. The radius r ₃ of the wound core wire holding portion 6 is formed to be larger than the radius r ₁ of the wound core wire holding portion 5.

[0016] The invention according to claim 2, r ₁ and the radius of the winding core wire holding portion 5 of Tatchipuri 3, wound already cord holding portion 6 radius r ₃ of, including mold thickness of the reinforcing material 1 Where r _{2 is} the radius of the core wire and t is the thickness of the core wire 4,
Of the difference d of the radius r ₃ and the winding core wires radius r ₁ of the pressing portion 5, d = A × (0.5t (r 1 + r 2) / r 2) ( however, A is from 0.1 to 0. (Coefficient of 7).

[0017]

Embodiments of the present invention will be described below.

FIGS. 1 and 2 show an embodiment of the present invention, in which a touch pulley 3 is formed in a columnar (or cylindrical) shape and is rotatable about a shaft 15. It is. The touch pulley 3 is formed integrally with one end in the axial direction as a wound core presser 5 and the other axial portion as a wound core presser 6. Core guide groove 17
Is recessed. And in this touch pulley 3,
The radius r ₃ of the wound core wire holding portion 6 is formed to be larger than the radius r _{1 of} the wound core wire holding portion 5 (radius at the groove bottom of the core wire guide groove 17).

As described above, the mold 2 is formed by a cylindrical body (or a cylindrical body) formed by providing a large number of concave grooves 11 for forming teeth in the outer periphery in parallel with the axial direction. , And is driven to rotate about the rotation shaft 16. The touch pulley 3 is provided with shafts 15 and 1
6 are arranged so as to be parallel, and are driven to move in a direction parallel to the axial direction of the mold 2.

The outer periphery of the mold 2 is covered with a reinforcing member 1 formed by sewing a sheet material such as canvas into a tube. A core wire is attached to the outer periphery of the reinforcing member 1 covered on the mold 2. When winding 4 in a spiral shape,
Is supplied to the outer periphery of the reinforcing material 1 and the mold 2 is rotationally driven in the direction of the arrow in FIG. 2 while guiding the core wire 4 with the core wire guide groove 17 of the winding core wire holding portion 5 of the touch pulley 3. At the same time, the touch pulley 3 can be moved in parallel with the mold 2 as shown by an arrow in FIG.
A pressing force is applied to the touch pulley 3 so as to press the core wire 4 against the reinforcing member 1 placed on the mold 2. The core wire 4 a to be wound from now on is a core guide of the winding core pressing portion 5. Since the core wire 4b wound around the outer periphery of the reinforcing member 1 is pressed by the groove 17 and wound around the outer periphery of the reinforcing member 1, the core wire 4b wound around the outer periphery of the reinforcing member 1 is held by the wound core core pressing portion 6, so that the reinforcing member 1 The arrangement of the core wires 4 on the outer periphery can be made good.

As described with reference to FIG. 5 of the conventional example, when the mold 2 is rotationally driven while being pressed by the touch pulley 3, and the core 4 is wound around the outer periphery of the reinforcing member 1, the core to be wound is to be wound. When the feed speed of the core wire 4a is faster than the feed speed of the wound core wire 4b, the reinforcing material 1 is partially drawn by the wound core wire 4a and moves, and the reinforcing material 1 shifts in the rotation direction of the mold 2. Twisting occurs. Therefore, if the feed speed of the core wire 4a to be wound is equal to the feed speed of the wound core wire 4b, the length of the fed core wire 4a and the length of the fed core wire 4b become equal. , The reinforcing material 1 on the core wire 4a to be wound.
Is no longer partially pulled, and the reinforcing material 1
Can be prevented from being distorted and twisted.

[0022] than the radius r ₁ of the winding core wire holding portion 5 of Tatchipuri 3 in the present invention, by forming the radius r ₃ of the winding already cord pressing portion 6 to a larger size, the winding core wire pressing portion 5 A difference in peripheral speed between the outer periphery of the core wire and the outer periphery of the wound core wire pressing portion 6, and the feed speed of the core wire 4 a to be wound while being pressed by the wound core wire pressing portion 5,
The feed speed of the wound core wire 4b held by the wound core wire holding portion 6 can be made equal, and the principle will be described with reference to FIG.

In FIG. 2, A ₀ , B ₀ , C ₀ , A ₁ , B ₁ ,
C ₁ is the same as that in FIG. 5 (where A ₀ is a point on the surface of the core wire 4a to be wound, and A ₁ is a point on the pitch line p of the core wire 4a to be wound. ). Further, since the radius r ₃ of the wound core wire holding portion 6 is formed to be larger than the radius r _{1 of} the wound core wire holding portion 5, the reinforcing material 1 and the wound core The wire 4b is compressed, and the wound core wire 4 is in contact with a portion of the outer periphery of the wound core wire holding portion 6 which is closest to the mold 2.
The point on the outer surface of b is A ₃ , the rotation axis 16 of the mold 2 and the point A ₃
Plots points as A ₅ on the pitch line p lines and winding pre cord 4b connecting. As in the case of FIG. 5, the arc A ₀ B ₀ = arc A ₀ C ₀ and the wound core 4b
Is compressed, but substantially arc A ₀ C ₀ = arc A ₃ C ₀
It does not matter. Then, a point B ₃ where the arc A ₃ C ₀ = the arc A ₃ B ₃ is plotted on the outer peripheral surface of the wound core wire holding portion 6.
₃ connecting straight line plots points B ₄ intersects the pitch line p of the core wire 4a to be Makitsukeyo.

Here, as described above, the touch pulley 3 is not driven to rotate by itself, and the wound core wire pressing portion 6 is pressed against the wound core wire 4b already wound around the outer periphery of the reinforcing member 1. As a result, the touch pulley 3 is rotated as shown by the arrow in FIG. Then, since the arc A ₃ C ₀ = the arc A ₃ B ₃ , the mold 2 is rotationally driven as shown by the arrow in FIG. 2 to feed the wound core 4 b, and the outer periphery of the wound core 4 b when point C ₀ of the reached point a ₃ of FIG. 2 will be a point B ₃ on the periphery of the winding core wire holding portion 6 is Tatchipuri 3 to reach the point a ₃ of FIG. 2 is rotated, Touch pulley 3
With this rotation of the core wire 4a, the core wire 4a to be wound is sent by the winding core wire pressing portion 5. Therefore, at this time, the feed speed of the core wire 4a to be wound and
Comparing the feed speed of the wound core wire 4b with respect to the pitch line p which is the true length of the core wire 4, [Feed speed of the core wire 4a to be wound: feed speed of the wound core wire 4b] = Arc A ₁ B ₄ : Arc A ₅ C ₁ ]. As is apparent from FIG. 2, arc A ₁ B ₄ <arc A ₁ B ₁
, And the so substantially the arc A ₅ C ₁ = arc A ₁ C _1,
Conventional 5 [feedrate core 4a to be Makitsukeyo: winding already cord 4b feedrate = arc A ₁ B ₁ of: arc A ₁ C _1] than in relation to attempts Makitsukeyo The feed speed of the core wire 4a can be reduced. Therefore, the state in which the feed speed of the core wire 4a to be wound as in the related art becomes faster than the feed speed of the wound core wire 4b is eliminated,
It is possible to make the feed speed of the core wire 4a to be wound and the feed speed of the wound core wire 4b as equal as possible, and it is possible to prevent the reinforcing material 1 from being distorted and twisted. Things.

Next, the reinforcing material 1 is deviated needed to prevent twisting, winding cord pressing portion 5 in Tatchipuri 3 radius r ₁ and the winding already cord holding portion 6 of the radius r ₃ The difference d is determined based on FIG. That is, from the relationship of [feed speed of the core wire 4a to be wound: feed speed of the wound core wire 4b = arc A ₁ B ₄ : arc A ₅ C ₁ ], the arc A ₁ B ₄ = arc A if ₅ C _1, the rate of speed and winding pre cord 4b of the core wire 4a to be Makitsukeyo are equal, it is possible to prevent the twisting displaced reinforcements 1. Therefore, as a necessary condition for making the arc A ₁ B ₄ = the arc A ₅ C ₁ , the difference d between the radius r ₁ of the wound core wire pressing portion 5 and the radius r ₃ of the wound core wire pressing portion 6 can be obtained. I just need.

Thus, in FIG. 2, arc A ₅ C ₁ / arc A ₃ C ₀ = (r ₂ + 0.5t) / (r ₂ + t) (the wound core wire 4b is compressed, Both sides can be virtually equal). Also, arc A ₁ B ₄ / arc A
_{3 B 3 = (r 1 +} 0.5t) / r 3 = (r 1 + 0.5t) /
(R ₁ + d). Since arc A ₃ C ₀ = arc A ₃ B ₃ , arc A ₁ B ₄ : arc A ₅ C ₁ = (r ₁ +0.5 t) /
To become _{(r 1 + d) :( r} 2 + 0.5t) / (r 2 + t). The condition for satisfying the arc A ₁ B ₄ = arc A ₅ C ₁ is (r ₁ + 0.5t) / (r ₁ + d) = (r ₂ +0.5)
t) / (r ₂ + t). Expanding this equation gives d
= Become _{0.5t (r 1 + r 2 +} t) / (r 2 + 0.5t). Since t is sufficiently smaller than r ₁ and r ₂ , r ₁ + r ₂ + t
{R ₁ + r ₂ , r ₂ + 0.5t} r ₂ .
Therefore, d = 0.5t (r ₁ + r ₂ ) / r ₂ can be obtained.

As described above, the radius r ₁ of the wound core wire holding portion 5 and the wound core wire holding portion 6 of the touch pulley 3 necessary to prevent the reinforcing member 1 from being distorted and twisted.
The difference d between the radii r ₃ can be obtained as d = 0.5t (r ₁ + r ₂ ) / r ₂ (1). However, in practice, slippage between the core wire 4 and the touch pulley 3, sinking of the core wire 4 due to compressive deformation of the reinforcing member 1, and the like are complicatedly affected. Since there is a phenomenon of warpage that is shifted in the opposite direction to the rotation of the mold 2, it is necessary to correct the above equation (1) obtained theoretically by applying a coefficient. As shown in FIG. 6, the phenomenon of warpage is caused by the core wire 4 to be wound around the reinforcing material 1 covering the outer periphery of the mold 2.
When the pressing force of the touch pulley 3 is applied via a, the reinforcing member 1 is partially floated from the surface of the mold 2 by the pressing force and is pushed in the direction opposite to the rotation direction of the mold 2 to be displaced. This is a shift opposite to the direction in which the reinforcing member 1 is vegitated in the rotation direction of the mold 2 due to a shift generated when the core wire 4 is wound around the outer periphery of the reinforcing member 1. Therefore,
D = A × (0.5t (r ₁ + r ₂ ) / r ₂ ) (2) obtained by multiplying the above equation (1) by a coefficient A of 1 or less is practically used. The coefficient A varies depending on the material of the reinforcing material 1 and the core wire 4 and the like, but is empirically determined to be 0.1 to 0.7 from a test using an actual machine.

Here, in manufacturing a toothed belt having 106 teeth, tooth shape MY, and a belt width of 25 mm, r ₁ = 7.
When 0 mm, r ₂ = 135 mm, and t = 1.20 mm, when these values are substituted to obtain d from the equation (1), d = 0.9 mm. ~
Multiplying by 0.7 results in d = 0.09 mm to 0.63 mm. Therefore, the radius r _{1 of} the winding core wire pressing portion 5 is 70
In the case of the touch pulley 3 of mm, the radius r ₃ of the wound core wire pressing portion is formed between 70.09 mm to 70.63 mm, thereby reliably preventing the reinforcing member 1 from shifting and twisting. , The core wire 4 can be wound.

In the present invention, as described above, the touch pulley
3 radius r of the wound core wire holding portion 6 _ThreeThe core wire is pressed
Radius r of head 5₁Is formed to be larger
The pressed core wire holding portion 6 for the wound core wire 4b
If the pressing force of the wire is weak, the winding core wire holding part 5 may be wound.
Floating from the core wire 4a to be wrapped around the reinforcing material 1
There is a possibility that the arrangement of the cored wires 4 may be deteriorated. others
To apply additional pressing force to the touch pulley 3
Wire 4b and the reinforcing material 1 are compressed by the wound wire holding part 6.
And wrap it around the wrapping wire holder 5.
So that the core wire 4a to be pressed can be pressed down.
Need to be Thus, the touch pulley 3 is strongly pressed.
Touch pulleys made of metal material
3, the radius r of the core wire holding portion 5₁And wound heart
Radius r of wire holding part 6_ThreeThe ratio of
There is no effect on the effect of preventing the material 1 from shifting and twisting. Ma
Since the core 4 and the reinforcing member 1 are formed of a fiber material,
Even if it is temporarily pressed by the tip pulley 3 and is compressed and deformed, power is transmitted.
There is no problem in the performance of the belt T.

[0030]

As described above, the present invention relates to a power transmission belt forming mold having a reinforcing material covered on the outer periphery thereof, and a rotatable and axially movable mold in contact with the reinforcing material covered on the mold. And a touch pulley that is driven to move along the die, by rotating the die while pressing the core wire supplied to the outer periphery of the reinforcing material over the die with the outer peripheral surface of the touch pulley,
In a transmission belt forming core wire winding device in which the core wire is spirally wound around the outer periphery of the reinforcing member, a winding core pressing portion for holding the core wire supplied to the outer periphery of the reinforcing member and being wound on the touch pulley, Since the wound core wire holding part that holds the wound core wire is formed around the outer periphery of the reinforcing material, the core wire to be wound and the wound core wire are wound with the core wire held down respectively. The arrangement of the cords on the outer periphery of the reinforcing member can be improved. Moreover, since the radius of the wound core wire holding portion is formed to be larger than the radius of the wound core wire holding portion, the circumferential speed at the outer periphery of the wound core wire holding portion and the outer circumference of the wound core wire holding portion is reduced. Make a difference so that the feed speed of the core wire to be wound while holding down with the wound core wire holding portion is equal to the feed speed of the wound core wire held by the wound core wire holding portion. The core wire can be wound around the outer periphery of the reinforcing member while preventing twisting due to displacement of the reinforcing member caused by the speed of the core wire to be wound being higher than the speed of the wound core wire. is there.

[Brief description of the drawings]

FIG. 1 is a partial front view showing an example of an embodiment of the present invention.

FIG. 2 is a side view of a part of the above.

3A is a side cross-sectional view illustrating an example of a process of manufacturing a power transmission belt, and FIG. 3B is an enlarged perspective view illustrating a part of the power transmission belt.

FIG. 4 is a partial front view showing a conventional example.

FIG. 5 is a partial side view of the same.

FIG. 6 is a partial side view showing the phenomenon of warpage.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reinforcement material 2 Die 3 Touch pulley 4 Core wire 5 Winding core wire holding part 6 Rolled core wire holding part

Continuation of the front page (72) Inventor Kaoru Doi 4-1-1, Hamazoe-dori, Nagata-ku, Kobe-shi, Hyogo Mitsuboshi Belting Co., Ltd. F term (reference) 4F213 AG16 AH12 WA17 WA97 WB01 WF05 WF23

Claims (2)

[Claims] 1. A mold for forming a power transmission belt having an outer periphery covered with a reinforcing member, and a touch pulley rotatable in contact with the outer periphery of the reinforcing member arranged on the mold and driven to move along the axial direction of the mold. The core wire is spirally wound around the outer periphery of the reinforcing member by rotating the mold while pressing the core wire supplied to the outer periphery of the reinforcing material over the mold with the outer peripheral surface of the touch pulley. In the above-described core winding device for forming a transmission belt, a touch core is provided on a touch pulley to hold a core wire supplied to the outer periphery of a reinforcing member and pressed, and a core wire wound around the outer periphery of the reinforcing member. A core winding device for forming a power transmission belt, wherein a winding core holding portion is formed, and a radius of the winding core holding portion is formed to be larger than a radius of the winding core holding portion. 2. The radius of the core wire holding portion of the touch pulley is r ₁ , the radius of the wound core wire holding portion is r ₃ , the radius of the mold including the thickness of the reinforcing material is r ₂ , and the thickness of the core wire is Let t be
The difference d of the radius r ₁ of radius r ₃ and the winding core wires holding portion of the winding already cord pressing portion, d = A × (0.5t ( r 1 + r 2) / r 2) ( however, A is 0 2. The core winding apparatus for forming a power transmission belt according to claim 1, wherein the coefficient is set to (a coefficient of 1 to 0.7).