JP3619831B2 - Laminated hose manufacturing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of manufacturing a multilayer hose that is particularly connected to a water discharge device which can carry, such as a shower head.
More specifically , the present invention relates to a method for manufacturing a laminated hose in which an outer cover layer is formed by laminating by feeding an outer cover material from an extruder along an outer peripheral surface of the inner pipe while feeding the inner tube at a constant speed.
[0002]
[Prior art]
Conventionally, as a laminated hose of this type, as disclosed in, for example, Japanese Utility Model Publication No. 56-35978, the hose connection end is sandwiched between cylindrical hose connection fittings, and connected to the shower head. By winding a coiled spring along the outer periphery of the connection end exposed from the hose connection fitting, even if bending force acts on the connection end exposed from the rigid hose connection fitting in use, the hose is still bent , Which resists bending force and prevents the connection end from bending at an acute angle, preventing fluid from stopping, reducing the flow rate, and damaging the hose.
Furthermore, as disclosed in Japanese Utility Model Publication No. Hei 3-48194, the thin tube-shaped cylindrical guide portion covers the outer periphery of the hose with a neck breakage prevention device provided with a spiral reinforcing bone, or utility model registration No. 2527836. As disclosed in Japanese Laid-Open Patent Publication No. Hokukai, there are some which cover the outer periphery of the hose with a neck breakage prevention device in which a strip is formed in a spiral shape.
In addition, as a method for manufacturing this type of laminated hose, for example, as disclosed in Japanese Patent Publication No. 6-9844, the operation (rotation) speed of the extrusion pump is changed at regular intervals, and the discharge amount of the jacket material is determined. By alternately increasing / decreasing the thickness, there are cases in which thick portions and thin portions are alternately laminated in the axial direction as the outer layer.
[0003]
[Problems to be solved by the invention]
However, in such a conventional laminated hose, since it is covered with a spiral or cylindrical reinforcing material along the outer periphery of the connection end, not only the design is uncomfortable and the appearance is bad, but also the spiral member There is a problem that accidents such as biting a finger into the gap are likely to occur and are dangerous.
In addition, in the above-described manufacturing method of the laminated hose, it is possible in principle to control the discharge rate of the jacket material by changing the operating speed of the extrusion pump. Changing it will cause unevenness in the discharge rate of the jacket material, so the thickness dimensions of the thick and thin parts cannot be made uniform, resulting in poor product finish accuracy and providing a stable product. There is a problem.
In order to solve this problem, as disclosed in, for example, Japanese Patent Publication No. 6-20786, a mold is placed on the outer periphery of the jacket material extruded and supplied from the extruder without increasing or decreasing the extrusion supply amount of the jacket material. In some cases, a thick portion is laminated and formed by mounting and additionally supplying a jacket material from an injection molding machine into the mold.
However, in this method, a mold and an injection molding machine are separately required to supply the jacket material, so that the equipment becomes complicated and large, and as a result, equipment costs and manufacturing costs are increased. There is a problem that becomes expensive.
Therefore, it is conceivable to arbitrarily change the wall thickness of the jacket layer by variably controlling the operating speed of the feeder and accelerating / decelerating the feeding speed of the inner tube.
However, in this case, since it affects the feeding speed of the inner pipe upstream from the feeder, the inner tube extrusion molding machine for extruding the inner pipe, and further reinforcing between the inner pipe and the jacket layer. When the wire is wound at a constant pitch and embedded, it may cause unevenness in the discharge rate of the inner tube material from the extruder for the inner tube, or the winding pitch of the reinforcing wire may be changed to There is a problem that the finishing accuracy is poor.
[0004]
The invention according to claim 1 of the present invention is that the thickness of the jacket layer can be arbitrarily changed with a simple structure without changing the discharge amount of the jacket material and the operating speed of the feeder or without additional lamination. It is intended.
The invention of claim 2, wherein, in addition to the object of the invention described in claim 1, a laminated hose wall thickness projects into a substantially trapezoidal cross section gradually becomes thin in accordance with the distance from the cylindrical thick part easily It is intended to be manufactured.
The invention described in claim 3 is intended to simplify the structure of the bypass means in addition to the object of the invention described in claim 1 or 2 .
[0005]
[Means for Solving the Problems]
To achieve the above object, According to one aspect of the present invention, in the operating speed of the feed Ri machine D and extruder E is sent to the downstream side of the associated without said transmission Ri machine D tube H1 Only the feed speed of the inner pipe H1 from the feeder D to the extrusion molding machine E is partially varied, and a bypass means 1 is provided for bypassing the feed path W of the inner pipe H1 so that the distance changes.
The deceleration of the inner pipe H1 feed and the extension of the detour distance are linked, and the acceleration of the feed of the inner pipe H1 and the shortening of the detour distance are linked.
According to a second aspect of the present invention, in the configuration of the first aspect of the invention, the operating speed of the take-up machine F disposed on the downstream side of the extrusion molding machine E is controlled, and the inner pipe is interlocked with the deceleration. The present invention is characterized in that the detour distance of H1 is extended and the detour distance of the inner pipe H1 is shortened in conjunction with acceleration.
According to a third aspect of the present invention, in the configuration of the first or second aspect of the invention, the detour means 1 causes the tension pulleys 1a and 1b engaged with the inner pipe H1 to cross the shortest distance direction of the feed path W. It is characterized in that a configuration for reciprocating is added.
[0006]
[Action]
The invention according to claim 1, in a state where the operating speed of the feed Ri machine D and the extruder E is kept constant, by interlocking with the deceleration of the inner tube H1 feed and elongation of detour distance, the inner tube H1 feed At this time, the slack of the inner pipe H1 generated as a result of the deceleration is absorbed, and at the same time, the laminated thickness of the jacket material H3 ′ supplied from the extrusion molding machine E gradually becomes thicker than at the constant speed feeding. On the other hand, by accelerating the feeding of the inner pipe H1 and shortening the detour distance, the laminated thickness of the jacket material H3 ′ supplied from the extrusion molding machine E is gradually reduced.
The invention of claim 2 controls the operating speed of the take-up machine F disposed downstream of the extrusion molding machine E with respect to the structure of claim 1 and controls the inner pipe H1 in conjunction with the deceleration. Since the detouring distance of the inner pipe H1 is shortened in conjunction with acceleration, the thin section H31 is moved by continuously operating the take-up machine F at the same high speed as that of the feeder D. By laminating continuously, by decelerating the take-up machine F from this state, the tapered thick part H33 is laminated in the middle of decelerating the take-up machine F, and the take-up machine F is continuously operated in a low speed state, Cylindrical thick part H32 is continuously laminated, and by accelerating take-up machine F from this state, tapered thick part H34 opposite to the above-mentioned tapered thick part H33 is oppositely tapered. The meat part H34 is laminated.
According to a third aspect of the present invention, in the configuration according to the first or second aspect , the bypass means 1 causes the tension pulleys 1a and 1b engaged with the inner pipe H1 to cross the shortest distance direction of the feed path W. Since a configuration for reciprocal movement is added, the detour distance of the inner pipe H1 is expanded and contracted by bending the inner pipe H1 into a substantially V shape with the tension pulleys 1a and 1b.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
In this embodiment, as shown in FIGS. 1 to 3, the manufacturing apparatus for the laminated hose H has a take-up machine B, a spiral machine C, a feeder D, and an outer pipe on the downstream side of the extrusion molding machine A for the inner tube. By sequentially arranging the tube extrusion molding machine, E, and take-up machine F, the reinforcing wire H2 is wound around the outer peripheral surface of the inner pipe H1, and then the thin portion H31 and the thick portion H32 alternate in the axial direction. The case where the lamination | stacking hose H which laminated | stacked the jacket layer H3 arrange | positioned in FIG.
[0008]
In addition, the code | symbol G in drawing is cooling apparatuses, such as a water tank, for example, it extrudes continuously from the inner tube H1 extruded from the extrusion molding machine A for inner tubes, and the extrusion molding machine E for outer tubes. The supplied jacket material H3 'is cooled.
[0009]
Further, in the case of the present embodiment, these inner tube extrusion molding machine A, take-up machine B, spiral machine C, feeder D, and outer tube extrusion molding machine E are operated at a constant speed, respectively. Only the operating speed of the machine F is controlled to be adjusted as will be described later, and the shape of the covering layer H3 is changed from the thin portion H31 to the thick portion H32, or vice versa.
[0010]
That is, the inner tube H1 extruded from the inner tube extrusion molding machine A is drawn at a constant speed by the take-up machine B, and one or a plurality of reinforcing wires H2 are drawn by the spiral machine C along the outer peripheral surface of the inner pipe H1. Are spirally wound at a constant pitch, and the inner pipe H1 and the reinforcing wire H2 are fed at a constant speed by the feeder D toward the extrusion molding machine E for the outer tube.
[0011]
In this outer tube extrusion molding machine E, a die E1 is disposed along the outer periphery of the inner tube H1 fed at a constant speed by the feeder D, and the molten jacket material H3 'is fed from the die E1 to the inner tube. In the present embodiment, the operation (rotation) speed is kept constant so that there is no unevenness in the discharge amount of the jacket material H3 ′. It is held and supplied quantitatively.
[0012]
Further, the feed path of the inner pipe H1 from the feeder D to the die E1 of the extrusion molding machine E is provided with a detour means 1 for detouring the distance so as to change the expansion and contraction, and the detour distance of the inner pipe H1 is expanded and contracted. By changing, the slackness of the inner pipe H1 generated along with the acceleration / deceleration of the take-up machine F is absorbed.
[0013]
The detour means 1 reciprocates a tension pulley that engages with the inner pipe H1 in a direction intersecting the shortest distance direction of the feed path W, and the inner pipe H1 is bent into a substantially V shape by the tension pulley. The detour distance of the pipe H1 is configured to expand and contract, and a plurality or one of the tension pulleys are arranged along the feeding direction of the inner pipe H1.
[0014]
In the case of the present embodiment, as the bypass means 1, two first pulleys 1a and second pulleys 1b are arranged in the feed direction of the inner pipe H1, and they are arranged in an accumulator such as an air cylinder as described later. The operation is controlled separately so as to be linked with the operation speed of the.
[0015]
Here, the operation control of the take-up machine F will be described in detail. When the thin-walled portion H31 is continuously laminated and formed as the coat layer H3 as shown in FIG. 1, the same high speed as the take-up machine B and the feed machine D is used. When continuously operating at (for example, 10 m / min) and changing the shape from the thin portion H31 to the thick portion H32 as shown in FIG. 2, the speed is reduced to a low speed (eg, 8 m / min), and as shown in FIG. When returning from H32 to the thin portion H31, acceleration is performed from the low speed to the original high speed.
[0016]
Further, the operation control of the bypass means 1 will be described in detail. When the thin wall portion H31 is continuously laminated as the outer cover layer H3 as shown in FIG. 1, the first pulley 1a is separated from the shortest distance of the feed path W. The detour distance of the inner pipe H1 is kept constant by holding the position (upward in the illustrated example).
When the shape is changed from the thin wall portion H31 to the thick wall portion H32 as shown in FIG. 2, the first pulley 1a is moved in the reverse approaching direction (downward in the illustrated example) simultaneously with the deceleration of the take-up machine F. The second pulley 1b is gradually moved in the direction away from the shortest distance of the feed path W (upward in the illustrated example) so that the generated slack in the inner pipe H1 is absorbed, and the detour distance of the inner pipe H1 is extended. .
When returning from the thick part H32 to the thin part H31 as shown in FIG. 3, the second pulley 1b is moved in the reverse approaching direction (downward in the illustrated example) simultaneously with the acceleration of the take-up machine F, and is generated accordingly. The detour distance of the inner pipe H1 is shortened by gradually moving the first pulley 1a away from the first pulley 1a so that the slack of the inner pipe H1 is absorbed. Return when laminating.
[0017]
Next, the manufacturing method of such laminated hose H is demonstrated according to process order.
First, at the time of laminating the thin portion H31 occupying most of the laminated hose H in the axial direction as the covering layer H3, as shown in FIG. 1, the take-up machine F is operated at the same high speed (eg 10 m / min), the first pulley 1a and the second pulley 1b constituting the detour means 1 are not moved and are held as they are.
[0018]
As a result, the feed speed of the inner pipe H1 passing through the die E1 of the extrusion molding machine E is maintained at a constant speed. Therefore, the reinforcing wire H2 is sandwiched between the outer peripheral surface of the inner pipe H1 and a fixed amount is supplied from the die E1. The coated outer cover materials H3 'are laminated with the same thickness dimension, and the thin portion H31 is continuously formed in a cylindrical shape.
[0019]
On the other hand, when this laminated hose H is used as, for example, a shower hose, the length is appropriately increased in the axial direction about every 1.5 m, and when used as a sprinkling hose wound around a take-up reel, about 20 to 30 m. A thick portion H32 having a dimension is partially formed.
[0020]
When the thick portion H32 is stacked, the take-up machine F is decelerated from the above-mentioned high speed state to a low speed (for example, 8 m / min) state, and at the same time, as shown in FIG. The second pipe 1b is gradually moved away (upward in the illustrated example) to extend the detour distance of the inner pipe H1.
[0021]
As a result, the slack in the inner pipe H1 generated with the deceleration of the take-up machine F is absorbed and stretched without slacking with a predetermined tension.
[0022]
Further, during the deceleration of the take-up machine F reaching the low speed state, the feeding speed of the inner pipe H1 passing through the die E1 of the extrusion molding machine E is gradually reduced along with this, and the outer cover supplied quantitatively from the die E1. The laminated thickness of the material H3 ′ gradually becomes thicker than that at the time of constant speed feeding. As a result, a tapered thick portion H33 is formed on the outer peripheral surface of the inner tube H1 with the reinforcing wire H2 interposed therebetween.
[0023]
After the take-up machine F reaches the low speed state, the slack of the inner pipe H1 generated because the feeder D is faster than the take-up machine F moves in the direction away from the second pulley 1b (upward in the illustrated example). Subsequently, the detour distance of the inner pipe H1 is increased and then absorbed.
[0024]
As a result, the feed speed of the inner pipe H1 passing through the die E1 of the extrusion molding machine E is maintained at a low speed, so that a constant amount is supplied from the die E1 with the reinforcing wire H2 sandwiched between the outer peripheral surface of the inner pipe H1. The covering material H3 'is laminated with the same thickness, and the thick portion H32 is continuously formed in a cylindrical shape.
[0025]
Thereafter, in order to return from the thick part H32 to the thin part H31, the take-up machine F is accelerated from the low speed state described above to the original high speed state, and at the same time, as shown in FIG. By moving in the direction (downward in the illustrated example) and gradually moving in the direction of leaving the first pulley 1a (upward in the illustrated example), the detour distance of the inner pipe H1 is shortened.
[0026]
As a result, the slack of the inner pipe H1 generated along with the acceleration of the take-up machine F is absorbed, and in the middle of the acceleration when the take-up machine F reaches the high speed state, the inside passes through the die E1 of the extrusion molding machine E accordingly. The feeding speed of the pipe H1 is also gradually accelerated, and the thickness of the outer cover material H3 ′ supplied from the die E1 is gradually thinner than that at the time of constant speed feeding. A tapered thick portion H34 opposite to the tapered thick portion H33 is formed across the reinforcing wire H2.
[0027]
Then, after the take-up machine F reaches the original high speed state, it returns to the state shown in FIG. 1, and the thin portion H31 is continuously formed.
At this time, if the take-up machine F is made faster than a high speed (for example, 10 m / min) as necessary, the thin wall portion H31 can be made thinner than its wall thickness to reduce the weight of the entire hose. is there.
[0028]
As shown in FIG. 4, the laminated hose H obtained by the manufacturing method described above is tapered in the axial direction with the thin portions H31... Arranged at appropriate intervals in the axial direction and the cylindrical thick portion H32 as the center. A covering layer H3 is alternately stacked in which the wall portions H33 and the portions protruding in a substantially trapezoidal cross section in which the tapered thick portions H34 in the opposite direction are continuous are alternately arranged.
[0029]
If the axial center positions of these cylindrical thick portions H32... Are cut as shown by the one-dot chain line in FIG. 4 in the subsequent process, the cylindrical thicknesses having appropriate lengths are connected to the cut connection end portions H4 on both sides. The thick portions H32 and H32 are arranged by an appropriate length, and tapered thick portions H33 and H34 are continuously formed so that the thickness dimension gradually decreases as they move away from the cylindrical thick portions H32 and H32. Is divided into a plurality of laminated hoses H ′.
[0030]
The laminated hose H ′ thus obtained is connected to the hose connection fittings I at the connection ends H4 on both sides thereof, for example, a water discharge device such as a shower head, and a water supply fitting such as a water supply tap and a hot water mixing tap. To be connected to each other.
As a specific example, FIGS. 5A and 5B show a case where the connection end H4 of the laminated hose H ′ and the shower head J are connected by a hose connection fitting I. FIG.
[0031]
This hose connection fitting I includes a bamboo shoot-like nipple I1 inserted along the inner peripheral surface of the connection end H4, and a caulking sleeve I2 inserted along the outer peripheral surface of the connection end H4 into which the nipple I1 is inserted. After the nipple I1 is inserted while expanding the diameter of the connection end H4, they are integrated by tightening with a caulking sleeve I2 from the outside, and further rotatable with respect to the outer peripheral surface of the caulking sleeve I2. The nut I3 fitted to the screw is screwed into the base end J1 of the shower head J, and the nut I3 and the exposed outer peripheral surface of the nipple I1 are sealed with a packing I4.
[0032]
Here, in the connection end portion H4 of the laminated hose H ′, a portion facing the nipple I1 and the caulking sleeve I2 of the hose connection fitting I is constituted by a cylindrical thick portion H32, and these nipple I1 and caulking sleeve I2 are formed. The portion exposed from the nut I3 is designed to be configured with tapered thick portions H33 and H34 that gradually become thinner as the distance from the cylindrical thick portion H32 increases.
[0033]
As a result, even if the connection end H4 of the laminated hose H 'is sandwiched between the nipple I1 and the caulking sleeve I2 of the hose connection fitting I as shown in FIG. Because it is thick, it can be compressed and deformed to the required depth position, and the hose can be prevented from coming off reliably. Moreover, the hose can be pulled out even if the thickness of the connecting end H4 is slightly thin with time. Can be prevented.
[0034]
Even if the bending force acts on the connection end H4 of the laminated hose H ′ exposed from the nut I3 of the hose connection fitting I which is a rigid body as the shower head J is used, this portion is tapered and thick. Since the bending strength is high at the portions H33 and H34, it is difficult to bend.
As a result, the neck end of the connection end H4 can be reliably prevented with a simple structure.
[0035]
In the preceding embodiment, the case where the laminated hose H in which the reinforcing wire H2 wound by the spiral machine C is embedded between the inner pipe H1 and the outer sheath layer H3 is formed is shown. Alternatively, the reinforcing wire H2 may not be embedded, or a reinforcing material having a shape other than the illustrated reinforcing wire H2 may be wound and embedded.
[0036]
Furthermore, although the first pulley 1a and the second pulley 1b are arranged as the bypass means 1 in the feeding direction of the inner pipe H1, the present invention is not limited to this, and one or three or more tension pulleys may be arranged.
Further, the tension pulley is elastically supported so as to move based on a change in the tension of the inner tube H1, without being driven by an accumulator such as an air cylinder, and automatically moves by the amount of slack in the inner tube H1. Anyway.
[0037]
Furthermore, although only the feed speed of the inner pipe H1 to the extrusion molding machine E is varied by acceleration / deceleration of the take-up machine F, the present invention is not limited to this, while the take-up machine F is operated at the same speed as the feed machine D at a constant speed. The detouring distance of the inner pipe H1 is driven to expand and contract, and the feed path from the extrusion molding machine E to the take-up machine F is detoured so that the distance changes, so that the feeding speed of the inner pipe H1 can be varied. It may be configured.
More specifically, from the laminated state of the thin portion H31, the detour distance of the inner pipe H1 is driven to extend and part of the constant speed feed of the inner pipe H1 by the feeder D is absorbed, whereby the inner pipe is fed to the extrusion molding machine E. By gradually reducing the feed rate of H1, the tapered thick portion H33 is stacked, and conversely from this state, the detour distance of the inner tube H1 is reduced and the feed rate of the inner tube H1 is gradually increased, The taper-shaped thick part H34 of the reverse direction is laminated | stacked, it returns to the lamination | stacking state of the thin part H31, and the laminated hose which protrudes in a cross-sectional substantially mountain shape as a result is manufactured.
[0038]
【The invention's effect】
As described above, the invention according to claim 1 of the present invention is such that the inner pipe H1 feed is decelerated and the bypass distance is extended while the operating speeds of the feeder D and the extrusion molding machine E are maintained constant. Are coupled to absorb the slack in the inner pipe H1 generated by the deceleration of the feeding of the inner pipe H1, and at the same time, the laminated thickness of the jacket material H3 'supplied quantitatively from the extrusion molding machine E is fed at a constant speed. The thickness of the outer cover material H3 'supplied from the extrusion molding machine E is fixed by linking the acceleration of the feeding of the inner pipe H1 with the shortening of the detour distance. Since the thickness is gradually reduced, the thickness of the jacket layer can be arbitrarily changed with a simple structure without changing the discharge amount of the jacket material and the operating speed of the feeder or separately adding additional layers.
Therefore, compared with the conventional type in which thick parts and thin parts are alternately stacked by increasing and decreasing the extrusion supply amount of the jacket material, the thickness of the thick part and thin part can be made uniform by simple control. In addition to providing a stable product with improved product finishing accuracy, the equipment is simplified and downsized compared to conventional products that require a separate mold and injection molding machine to supply additional coating materials. As a result, equipment costs and manufacturing costs can be reduced.
Also, since the feeder may be a constant speed feed, even when an inner tube extrusion molding machine for extruding the inner tube, and even when a reinforcing wire is wound at a constant pitch and embedded between the inner tube and the outer sheath layer, The discharge amount of the inner tube material from the extrusion molding machine for the inner tube does not vary, and the winding pitch of the reinforcing wire does not change, so that the finished accuracy of the product is improved and a stable product can be provided.
[0040]
In the invention of claim 2 , in addition to the effect of the invention of claim 1 , the thin portion H31 is continuously laminated by continuously operating the take-up machine F at the same high speed as that of the feeder D. By decelerating the machine F, the tapered thick part H33 is laminated during the deceleration of the take-up machine F, and the cylindrical thick-walled part H32 is continuously operated by continuously operating the take-up machine F in a low speed state. When the take-up machine F is accelerated from this state, the tapered thick part H34 opposite to the tapered thick part H33 is laminated with the tapered thick part H34 opposite to the tapered thick part H33. A laminated hose that protrudes into a substantially trapezoidal cross section in which the thickness dimension gradually decreases as the distance from the thick portion increases can be easily manufactured.
Therefore, the existing hose production line remains as it is simply by controlling the shift of the take-up machine F of the existing hose production line that produces a constant thickness laminated hose at a constant speed and additionally installing a detour means in the middle of the line. Since it can be used, remodeling is easy and the remodeling period and remodeling cost can be suppressed, and the manufacturing cost can be reduced.
[0041]
In the invention of claim 3 , in addition to the effect of the invention of claim 1 or 2 , since the inner pipe H1 is bent into a substantially V shape by the tension pulleys 1a and 1b, the detour distance of the inner pipe H1 is expanded and contracted. The structure of the detour means can be simplified.
[Brief description of the drawings]
FIG. 1 is an explanatory view of a laminated hose manufacturing apparatus according to an embodiment of the present invention, and shows a time when a thin portion is formed.
FIG. 2 is an explanatory view showing the start of formation of a tapered thick part and a cylindrical thick part.
FIG. 3 is an explanatory view showing the end of formation of a tapered thick wall portion in the reverse direction.
FIG. 4 is a partially cutaway front view of the manufactured laminated hose.
5A is a partial longitudinal front view showing a joined state of laminated hoses according to an embodiment of the present invention, and FIG. 5B is a partial longitudinal front view showing an exploded state thereof. is there.
[Explanation of symbols]
D Feeder E Extruder F Take-up machine H1 Inner tube H3 Outer coating layer H3 'Outer coating material H31 Thin part H32 Cylindrical thick part H33, H34 Tapered thick part H4 Connection end W Feed path 1 Bypass means 1a , 1b Tension pulley

Claims (3)

While the inner pipe (H1) is fed at a constant speed by the feeder (D), the outer jacket material (H3 ′) is extruded and supplied from the extrusion molding machine (E) along the outer peripheral surface thereof. In a method for producing a laminated hose,
Only the feed rate of the inner pipe (H1) fed to the downstream side of the feeder (D) is partially varied regardless of the operating speed of the feeder (D) and the extrusion molding machine (E), and A detour means (1) for detouring the feed path (W) of the inner pipe (H1) from the machine (D) to the extrusion molding machine (E) so that the distance thereof is expanded and contracted,
A method for manufacturing a laminated hose, wherein the deceleration of the inner pipe (H1) feed and the extension of the bypass distance are linked to each other, and the acceleration of the feed of the inner pipe (H1) and the shortening of the bypass distance are linked. The operating speed of the take-up machine (F) arranged on the downstream side of the extrusion molding machine (E) is controlled to increase / decrease, and the detour distance of the inner pipe (H1) is extended in conjunction with the deceleration, and also linked to acceleration. method for producing a laminated hose according to claim 1, wherein to shorten the detour distance of the inner tube (H1) and. The lamination according to claim 1 or 2, wherein the bypass means (1) reciprocates the tension pulleys (1a, 1b) engaged with the inner pipe (H1) in a direction intersecting the shortest distance direction of the feed path (W). Hose manufacturing method.

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