Method of manufacturing and a manufacturing device of reinforced hose

A single head forms an outside layer material supply passage connected through to an annular slit at joined portion, a reinforcing material supply passage and an inside layer material supply passage. An outside rubber layer is supplied to the outside material supply passage. A reinforcing cloth is supplied to the reinforcing material supply passage, and an inside rubber is supplied to the inside layer material supply passage respectively. A vacuum is formed up to the pressure of the joined portion by reducing under a vacuum the inside of the reinforcing cloth supply passage, thereby removing water or gas such as air attaching to both surfaces of the reinforcing cloth and increasing the adhesion of the outside rubber layer and the inside rubber layer with the reinforcing cloth being half there between.

BACKGROUND OF THE INVENTION 
1. Field of the Invention 
The invention relates to a method and a device adapted for manufacturing a 
reinforced hose such as a rubber hose with a reinforcing fiber material 
being caused to be interposed between the inside and outside layers. 
2. Prior Art 
In patent publication Sho 52-17855 a device is disclosed for manufacturing 
a reinforced hose wherein a supply passage is provided within the same 
head for providing a plastic material for an inside layer and a plastic 
material for an outside layer and a reinforcing cloth (reinforcing fiber 
material) between both layers, to thereby manufacture a reinforcing hose 
by one extrusion process (hereinafter called as a single stage process 
method). 
Further, it has been practiced in the past to form these three layers in 
turn by a continuous process, and in the case, the process comprises a 
second process wherein a reinforcing yarn is spirally wound on the surface 
of an inside layer tube extruded in a first process and a third process 
for forming further an outside layer thereon, and a third process, where 
adhesion of the outside layer, reinforcing yarn and inside layer tube is 
increased by suction under a reduced pressure (hereinafter called as a 
multiple stage process method). 
PROBLEMS IN THE PRIOR ART 
Incidentally, when the circumference of the reinforcing fiber material such 
as reinforcing cloth or yarn with water or air being attached thereto is 
joined with the inside and outside layers, the inside layer and the 
outside layer are easily made to peel off from the reinforcing fiber 
material thereby reducing the reinforcing effect of the reinforcing fiber 
material. In order to improve the strength of the reinforced hose, it is 
necessary to increase the adhesion of the reinforcing fiber material and 
the inside and outside layers, so that the improvement of the adhesion is 
especially important when aiming at manufacturing of produces of high 
performance. 
On the other hand, in order to improve the adhesion with the reinforcing 
fiber material, when the plastic material of the inside and outside layers 
is caused to be firmly compressed against the reinforcing fiber material 
for joining, the reinforcing fiber material must be pulled out from the 
head with a greater force. For this reason, since the dimensions of the 
reinforcing fiber material do not stabilize if such reinforcing fiber 
material is of a knit or resin film which is easily stretched, such 
stretchy reinforcing fiber material cannot be used and the use thereof is 
limited to a material having high dimensional stability and rigidity such 
as leno cloth. However, in the case where a product is used for an 
application wherein the product is subjected to repeated bending, the use 
of a flexible reinforcing fiber material such as a knit was eagerly 
desired. 
Moreover, when the reinforcing cloth made of woven cloth such as the knit 
is used, since the single fiber of the reinforcing cloth remains in direct 
contact in the entangled portion even after it is joined with the inside 
and outside layers, when it is used for a long time in a condition where a 
repeating force is applied, there is the possibility that the reinforcing 
cloth itself is broken, so that this is also desired that the mutually 
direct contact of the single fibers can be prevented. 
In addition to that, since a relatively large amount of gas such as steam 
or air is caught and stays in the joined portion even after the 
compression provided in such a manner as above, pressure must be applied 
during vulcanization to an extruded but not yet vulcanized hose in an 
application where high strength is required of a product such as a rubber 
hose for pressurized fluid for automobiles. However, since this 
pressurized vulcanizing is a batch process, continuous forming such as 
vulcanizing under normal pressure became impossible, posing a problem in 
improving the forming efficiency. 
What is more, according to the foregoing multiple step process method, it 
is not possible to reduce the pressure of the joint portion with the 
inside and outside layers while winding the reinforcing yarn, there is the 
possibility of the attachment of water or air through the gap between the 
inside layer tube and the reinforcing yarn. 
Since pressure reduction in the third process is carried out by the suction 
of the inside layer circumference with a vacuum pump while feeding the 
inside layer wound with the reinforcing yarn tube into the head, the 
passage in the head for feeding the inside layer tube requires a clearance 
to some extent and the passage must be relatively short in order to 
prevent the physical change of the inside layer tube. 
As a result, the pressure of the joined portion of the outside layer within 
the head is not reduced so much, so that even if it is possible to 
increase to an extent the adhesion between the outside layer, reinforcing 
yarn and inside layer tube by means of suction under a pressure reduction, 
it will not be possible to obtain the adhesion which meets the case where 
higher performance is required. 
SUMMARY OF THE INVENTION 
In a method for manufacturing a reinforced hose according to the present 
invention, wherein a reinforced hose is formed by simultaneously supplying 
within the same head a reinforcing fiber material between a plastic 
material for an inside layer and a plastic material for an outside layer, 
the portion where the plastic material for an inside layer and the 
reinforcing fiber material are jointed and integrated and the pressure of 
the portion where the plastic material for an outside layer and each layer 
of the reinforcing fiber material are joined and integrated are reduced. 
Further, a degree of pressure reduction in the present invention which is 
applied to the joined portion means a pressure reduction state lower than 
the atmosphere, for instance a pressure reduction extending below about 
600 mmHg is included. Also, the woven cloth and nonwoven cloth is included 
in the reinforcing fiber material. 
The device for manufacturing a reinforcing hose used for the method of 
above, a supply passage of the plastic material for an inside layer, that 
of the plastic material for an outside layer and that of the reinforcing 
fiber material are provided within the same head so as to join at the tip 
of the supply passage, the material supply passage for the reinforcing 
fiber material is caused to be joined between the supply passage of the 
plastic material for an inside layer and that of the plastic material for 
an outside layer, the reinforcing material supply passage is connected to 
a vacuum pump to reduce the pressure of the aforementioned joined portion, 
the reinforcing material supply passage is connected to a pressure 
reducing passage of the exterior of the head, to thereby supply the 
reinforcing fiber material to the reinforcing material supply passage 
through the pressure reducing passage. 
In this case, the vacuum pump is connected between the reinforcing material 
supply passage and the vacuum pump as the pressure reducing passage, so 
that it is possible to contain the roll of reinforcing fiber material in 
this vacuum tank. 
Instead of the vacuum tank, it is also possible to make the pressure 
reducing passage of an open type with one end of the pressure reducing 
passage connected to the reinforcing material supply passage, the other 
end thereof is opened to the atmosphere and the atmosphere opening portion 
is an inlet of the reinforcing fiber material to the pressure reducing 
passage. In this case, the vacuum pump is connected from the outlet of the 
pressure reducing passage to the head side. 
This pressure reducing passage can be formed by folding it in a plurality 
of stages, in which case, it is also possible to form the pressure 
reducing passage in the joined portion of a block which overlaps in a 
plurality of stages. 
Moreover, a roller with a part thereof fronting into the pressure reducing 
passage is provided, so that it is possible to feed the reinforcing fiber 
material pressurized by means of this roller. 
Furthermore, it is also possible to use a knit as the reinforcing cloth 
composing the reinforcing fiber material in the aforementioned 
manufacturing method or the manufacturing device. 
Furthermore, it is also possible that the reinforcing fiber member is sent 
by a sending belt which is wound and hung between a pair of rollers 
provided inside and outside of the pressure reducing passage, and a seal 
member is provided in an inlet of the sending belt and the reinforcing 
fiber member to the pressure reducing passage. 
The sending belt and the seal member may be composed of self-lubricating 
material respectively. 
EFFECTS OF THE INVENTION 
In the method of manufacturing a reinforcing hose according to the present 
invention, the pressure of the portion where the respective layer of a 
plastic material for an inside layer and a reinforcing fiber material and 
a plastic material for an outside layer and a reinforcing fiber material 
are joined and integrated, is reduced in the aforementioned single stage 
process. 
According to a method of manufacturing such as this, since it is possible 
to form a high vacuum respectively in the jointed portion of the plastic 
material for an inside layer and the reinforcing fiber material and the 
jointed portion of the plastic material for an outside layer and the 
reinforcing fiber material, it is possible to remove water and gas such as 
air mixing into these joined portions almost completely. 
Therefore, it is possible to integrate the plastic material for an inside 
layer, plastic material for an outside layer, and reinforcing fiber 
material with high adhesion. 
Since it becomes difficult for the inside and outside layers to be peeled 
from the reinforcing fiber material and the reinforcing effect when the 
reinforcing fiber material becomes noticeable, it is possible to improve 
the strength of the reinforced hose to thereby remarkably improve the 
durability. 
As a result, in the case of a fluid pressurizing hose for a certain type of 
automobile, it is possible to obtain a high performance product which can 
be used satisfactorily for an application where high pressure is applied 
repeatedly. 
Moreover, when vulcanizing a unvulcanized hose extruded from the head, 
since it is possible to adopt vulcanization under normal pressure, the 
vulcanizing process can be made continuously unlike the conventional batch 
process, to thereby considerably improve the forming efficiency. 
Furthermore, since the adhesion of the plastic material for inside and 
outside layers with respect to the reinforcing fiber material is 
accomplished by suction under a vacuum from the side of the reinforcing 
fiber material, that is, from the inside it is not necessary to compress 
the plastic material for an outside layer form the side of the bed in 
order to increase the adhesion as in the case of a conventional method. 
Therefore, the pressure for extruding a vulcanized hose form the head is 
reduced, so that the force for pulling out the reinforcing fiber material 
can also be small. 
As a result, since unnecessary stretching caused for pulling out the 
reinforcing fiber material from the bed with a large force is restrained, 
it is possible to obtain a product of high dimensional stability and use 
the reinforcing fiber material as the reinforcing material. 
In addition, in the manufacturing device intended for the method of 
manufacturing, the reinforcing material supply passage is connected to the 
vacuum pump, the joined portion of the plastic material for an inside 
layer and the reinforcing material supply passage and the joined portion 
of the plastic material for an outside layer and the reinforcing material 
supply passage are sucked under a vacuum, the reinforcing material supply 
passage is connected to the pressure reducing passage of the exterior of 
the head, and the reinforcing fiber material is supplied to the 
reinforcing material supply passage through the pressure reducing passage. 
In this manner, since the reinforcing fiber material is supplied from the 
pressure reducing passage of the exterior of the head, it is possible to 
maintain a high vacuum in each of the aforementioned joined portions, to 
thereby obtain various effects such as an improvement in adhesion. 
If the vacuum tank is made of a pressure reducing passage and the roll of 
the reinforcing fiber material is contained therein, the pressure reducing 
passage becomes a closed type passage, so that it is possible to maximize 
the vacuum of the joined portion. 
Still more, instead of the vacuum tank, it is also possible to provide a 
passage cross section which is almost the same size as the width and 
thickness of the reinforcing fiber material, connect one end of the 
pressure reducing passage to the reinforcing material supply passage, and 
make an open type pressure reducing passage with the other end opened to 
atmosphere. 
In this case, by passing the reinforcing fiber material having a cross 
section which is almost the same as the cross section of the pressure 
reducing passage, a high vacuum is maintained in the reinforcing material 
supply passage, and continuous process is made possible by arranging the 
roll in the atmosphere. 
Further, when the pressure reducing passage is formed by folding it into a 
plurality of stages, it is possible to make the passage sufficiently long 
so as to separate the outlet side effectively from the inlet side opened 
to the atmosphere, restrict the reduction of vacuum on the outlet side to 
an extent without influence, and miniaturize the entire device at least in 
the direction of the length by folding back the pressure reducing passage. 
By forming at this time the pressure reducing passage in the joined portion 
of blocks overlaying in a plurality of stage, it is possible to easily 
form the overlaid pressure reducing passage. 
And furthermore, when a roller is provided with a part thereof facing into 
the pressure reducing passage so that the device is arranged to send the 
reinforcing fiber material pressurized by the roller, it is possible to 
increase the adhesion on the outlet side in the pressure reducing passage, 
it is possible to further reduce the length of the passage so as to 
miniaturize the entire device even if the pressure reducing passage is of 
an open type, thereby easily adopting to changes in thickness and width of 
the reinforcing fiber material. 
In addition, it is also possible to use a knit as the reinforcing cloth in 
the aforementioned manufacturing method or manufacturing device, and in 
this case, the elasticity and flexibility of the knit itself allow easy 
following with bending or expansion and contraction of the hose which is 
the product. 
Therefore, dimensional stability is increased although a knit is used as 
mentioned above, at the same time, even during severe use with no rigidity 
such as use of the conventional leno cloth and the single fiber composing 
the reinforcing cloth being bent repeatedly at the portion of mutual 
entangled, the inner and outer layer material comes into the portion of 
the single fiber mutually entangled area, and mutual direct contact of the 
single fiber in the portion of the single fiber entangling mutually can be 
prevented so that the durability is remarkably increased. 
Where the reinforcing fiber member is sent by a sending belt wound and hung 
between a pair of rollers provided inside and outside of the pressure 
reducing passage, and the seal member is provided in an inlet of the 
sending belt and the reinforcing fiber member to the pressure reducing 
passage, it is possible to reduce the pressure inside of the pressure 
reducing passage. 
When, if the sending belt and the seal member are composed of a 
self-lubricating material respectively, the resistance on transferring of 
the reinforcing cloth can be lessen, and since it is not required to make 
the tension applied to the reinforcing cloth excessively large, cutting on 
transferring of the reinforcing cloth can be prevented and the 
transferring devices such as a motor can be made compact.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
FIG. 2 shows the overall structure of the device, in which a head 1 is 
equipped with a product extruding nozzle section 2 which sticks out along 
the extruding axis C1 of the hose, an outside layer side joint 3 which 
sticks out to spread backward diagonally form the rear of the extruding 
nozzle section 2 (the extruding direction is the front) with the axis C1 
there between, and an inside layer side joint 4, and an extruding nozzle 
5,6 of crude rubber is respectively connected thereto. 
At the rear end section of the head 1 is provided a central joint 7 to 
which an end of a guide tube 8 is connected. The other end of the guide 
tube 8 is connected to a vacuum tank 9 which forms a closed type pressure 
reducing passage, and a reinforcing cloth 10 is contained in the inside of 
the vacuum tank 9. 
The reinforcing cloth 10 is a cloth made of a knit, and a roll 11 thereof 
is entirely contained in the vacuum tank 9. The roll 11 is replaced by a 
batch process whereby the vacuum tank 9 is opened. 
Further, the knit used for the reinforcing cloth 10 is made to easily 
stretch at least in the vertical direction (the feeding direction in the 
diagram) so as to bend flexibly with respect to the bending, provided that 
the knit may stretch in both the vertical and horizontal directions as 
occasion demands. 
The reinforcing cloth 10 enters the guide tube 9 which forms a part of the 
pressure reducing passage through a roller 12,13 provided inside the 
vacuum tank 9 and is supplied to the inside of the head 1 from the central 
joint 7. 
On the wall section of the vacuum tank 9 is provided a suction port 13 
which is connected therefrom to an outside vacuum pump 16 through a hose 
15, to thereby form a vacuum inside of the vacuum tank 9 and the guide 
tube 9 as well as the inside of the head 1 through the vacuum tank 9 and 
the guide tube 8 as mentioned later. 
As is apparent from FIG. 3, which is an enlarged cross section of the front 
portion of the head 1 and FIG. 1 which is a part of FIG. 3 showing a 
further enlarged joined portion of the reinforcing cloth 10 and the inside 
and outside rubber layer, the front end portion of the head 1 is provided 
with a core 20 and a die 21 which surrounds the front portion of the head 
1. 
Between the outside circumference of the core 20 and the inside 
circumference of the die 21 is formed an annular slit 23 to send out a 
semimanufactured hose 22. The semimanufactured hose 22 is a 
semimanufactured product before vulcanizing which is shaped like a hose 
adhered closely with the inside and outside rubber layer that hold the 
reinforcing cloth 10 therebetween. The annular slit 23 is concentric with 
the outside circumference of the core 20 and the inside circumference of 
the die 21 and is almost equivalent to the thickness of the 
semimanufactured hose 22. 
On the outside circumference of the core 20 and the inside circumference of 
the die 21 is formed a linear cross section 24,25 which is respectively 
parallel tot he extruding axis C1, and the rear section respectively 
thereof is continued to a slope 26 which is inclined inwardly and a slope 
27 which is inclined outwardly. 
In the space spreading backward and formed between the slope 26 and the 
slope 27 are provided a guide ring 28 and a front joint 29 and the front 
joint 29 is concentrically inserted into the inside of the guide ring 28. 
The guide ring 28 is equipped with an outside circumference slope 30 and an 
inside circumference slope 31, and the outside circumference slope 30 
forms an outside layer material supply passage 32 which faces the slope 27 
with a space therefrom. 
The front joint 29 is equipped with an outside circumference surface 33 and 
an inside circumference slope 34 of linear cross section, the outside 
circumference surface 33 forms a reinforcing cloth supply passage 35 
between the outside circumference surface 33 and the inside circumference 
slope 31, and the inside circumference slope 34 faces the slope 26 with a 
space therefrom so as to form an inside layer material supply passage 36. 
At the joined portion 37, the annular slit 23 is made to be communicated to 
three supply passages consisting of the outside layer material supply 
passage 32, reinforcing cloth supply passage 35 and inside layer material 
supply passage 36. 
The outside layer material supply passage 32 is communicated to the raw 
rubber extruding nozzle 5 (FIG. 2) through the outside layer side joint 3, 
and the inside layer material supply passage 36 is communicated to the raw 
rubber extruding nozzle 6 through the inside layer side joint 4, and an 
outside layer rubber 38 and an inside layer rubber 39 which are not 
vulcanized or half vulcanized are supplied as the plastic material 
respectively to the extruding nozzle 5 and the extruding nozzle 6. 
On the other hand, since the reinforcing cloth supply passage 35 is 
communicated to the guide tube 8 through the central 7, the reinforcing 
cloth 10 from the guide tube 8 is supplied to the jointed portion 37. At 
this time, since the reinforcing cloth supply passage 35 is connected to 
the vacuum tank 9 through the guide tube 8 and the reinforcing cloth 10 
and the roll 11 thereof are entirely contained in the vacuum tank 9, the 
vacuum tank 9 and the guide tube 8 for sending out the reinforcing cloth 
10 to the reinforcing cloth supply passage 35 are of a closed type. 
Therefore, when a pressure reduction is performed by the vacuum pump 
connected to the vacuum tank 9, since the passage of the reinforcing cloth 
10 is closed entirely through the guide tube 8, vacuum tank 9 and 
reinforcing cloth supply passage, the specified high vacuum state is 
maintained up to the joined portion 37 by the vacuum pump 16 for the most 
part. 
In addition, in FIG. 3 a back joint 40 forms a part of the inside layer 
material supply passage, holds the guide ring 28 and the front joint 29 
concentrically, and supports the core 20 through an axis center rod 41. 
The case 42 supports the die 21. 
When a reinforcing hose is manufactured in this device, the outside rubber 
layer 38 and the inside rubber layer 39 are joined at the joined portion 
37, but the reinforcing cloth 10 nearing the joined portion as it is 
rounded gradually into a cylindrical shape at this time is supplied 
between the joined portion of the outside layer rubber 38 and the inside 
layer rubber 39 so that the three layers are integrated. 
At this time, as is apparent in FIG. 1, since a high vacuum of the 
reinforcing cloth supply passage 35 is maintained up to the joined portion 
37, water and gas such as air is removed almost completely, so that the 
outside layer rubber 38 and the inside layer rubber 39 are respectively 
integrated at high adhesion on both the inside and the outside surfaces 
thereof. 
Moreover, by maintaining a high vacuum up to the joined portion 37, the 
outside layer rubber 38 and the inside layer rubber 39 are applied with a 
force in a mutually approaching direction, so that integration with 
greater strength can be accomplished. 
In addition to that, since the linear cross section 25 is formed in the die 
21 and the outside layer rubber 38 having entered the inside of the 
annular slit 23 from the joined portion 37 generates a force F toward the 
direction of the axis C1 from the linear cross section 25, the outside 
layer rubber is caused to adhere to the reinforcing cloth 10 and the 
inside layer rubber 39 with greater strength so as to be joined and 
integrated. However, the adhesion (secondary adhesion) taking place here 
is supplementary, and the adhesion (primary adhesion) caused by a high 
vacuum in the aforementioned joined portion 37 has priority. Therefore, if 
the adhesion is sufficient, it is so arranged that the aforementioned 
force F is minimized in the secondary adhesion and that the 
semimanufactured hose 22 is smoothly sent out from the head 1. 
Therefore, it is possible to cause the reinforcing cloth 10 to adhere to 
the joined surfaces of the outside rubber layer 38 and the inside rubber 
layer 29, and moreover, since water or gas such as air can be mostly 
removed from the reinforcing cloth 10, it is possible to remarkably 
improve the adhesion between these three layers, and by vulcanizing 
thereafter the semimanufactured hose 22 obtained in this manner, it is 
possible to form a reinforcing hose of a high strength as a final product. 
Furthermore, since the outside rubber layer 38 and the inside rubber layer 
39 also enter between single fibers forming the reinforcing cloth which is 
a knit, it is possible to prevent the direct contact in the portion where 
single fibers are mutually entangled, thereby increasing the durability as 
well. 
Still more, as the material of the outside rubber layer 38 and the inside 
rubber layer 39, it is possible to use various plastic rein materials no 
only limiting to rubber. 
Next, a form of a second embodiment will be explained based on FIG. 3 and 
FIG. 5. The same symbols will be used for the same portion as the form of 
the aforementioned embodiment (the same applies to the form of other 
embodiments of the following). 
FIG. 4 is a diagram illustrating a partially cutaway view of the entire 
device in the form of the second embodiment, and FIG. 5 is a cross 
sectional view of the line 5--5 of FIG. 4. As is apparent in these 
figures, at the back of the guide tube 8 is connected a pressure reducing 
member 110 through a connecting pipe 100. To this connecting pipe 100 is 
connected a vacuum pump 104 through a hole 102. 
The pressure reducing member 110 is composed of a plurality of blocks and 
assembled by overlaying a plate-shaped first stage member 111, a second 
stage member 112, a third stage member 113 and a fourth stage member 113 
as well as a first edge member 115 between the first stage member 111 and 
the third stage member 113 and a second edge member 116 between the second 
stage member 112 and the fourth stage member 114, and an open type 
pressure reducing passage 120 folded in many stages is formed between 
these blocks. 
The pressure reducing passage 120 is formed by a surface groove from 121 to 
123 and a guide groove 124, 125 as well as the joining surface of adjacent 
stage members, and provides a passage cross section almost equivalent to 
the width and thickness of the reinforcing cloth 10. 
Each surface groove from 121 to 123 is formed respectively on each joining 
surface of the first stage member 11, the second stage member 112 or the 
third stage member 113 so as to spread into the direction of the plane of 
each stage member at a depth of almost the same as the thickness of the 
reinforcing cloth 10, and one side is opened so that the surface groove 
from 121 to 123 is closed by the joining surface between adjacent stage 
members. 
The surface groove 121 is formed on the upper surface of the first stage 
member 111 which joins the lower surface of the second stage member 112, 
the front end (on the head 1 side) is opened so as to be connected to the 
connecting pipe 100, the rear end (on the roll 11 side) forms a dead end 
and is connected to the curved guide groove 124 formed on the surface of 
the vertical direction of the first edge member 115 placed at the rear end 
portion of the first stage member 111. 
The surface groove 122 is formed on the upper surface of the second stage 
member 112 which joins the lower surface of the third stage member 113, 
the rear end forms a dead end and is connected to the guide groove 124 of 
the first edge member 115, and the front end also forms a dead end and is 
connected to the similar guide groove 125 formed on the second edge member 
116 placed on the front end of the second stage member 112. 
The surface groove 123 is formed on the upper surface of the third stage 
member 113 which joins the lower surface of the fourth stage member 114, 
the front end forms a dead end and is connected to the guide groove 125 of 
the second edge member 116, and the rear end is opened backward to form an 
opening 117 at the back of the pressure reducing member 110. 
The reinforcing cloth 10 enters the pressure reducing passage 120 from the 
opening 117 formed on the back of the pressure reducing member 110, enters 
the connecting pipe 100 from the front end of the surface groove 121 while 
moving in a zigzag direction through each stage, and is supplied further 
to the reinforcing cloth supply passage 35 in the head 1. 
Between the opening 117 of the pressure reducing member 110 and the roll 11 
are provided rollers 150, 151. In such a open type pressure reducing 
passage, the roll side atmosphere opening is the inlet and the head 1 side 
joint opening is the outlet. 
The symbol 126 shown in FIG. 5 is a sealing member to secure the seal on 
the joining surface between each stage member. 
Further, the pressure reducing passage 1210 is formed into three stages so 
as to fully secure the passage length, but the number of stages is not 
limited to such numbers and can be freely decreased or increased. 
In a device in the form of the present embodiment, when the pressure 
reduction is carried out by the vacuum pump 104 in front of the pressure 
reducing member 110, pressure from the reinforcing cloth supply passage 35 
to the pressure reducing passage 120 is reduced and the opening 117 which 
is opened to atmosphere is remotely separated from the connected portion 
of the vacuum pump 104 by means of the pressure reducing passage 120 
having a sufficiently long passage. 
Therefore, it is possible to maintain a high vacuum in the reinforcing 
cloth supply passage and increase the adhesion between the aforementioned 
inside and outside layer rubber materials and the reinforcing cloth, and 
the roll 11 can be installed in the atmosphere, so that it is possible to 
carry out continuous forming by immediately replacing the roll 11 even 
when it runs out. 
Since the pressure reducing passage 120 is folded to form many stages, it 
is possible to miniaturize the pressure reducing member 110 at least in 
the direction of the length. Further, since the pressure reducing passage 
120 is formed simply by overlaying from the first stage member 11 to the 
fourth stage member 113 and the first edge member 115 and 116, assembly of 
the pressure reducing member 110 is easy, and when the number of stages is 
increased or decreased as occasion demands, the number of folding stages 
can be changed freely. 
Next, the form of a third embodiment will be explained according to FIG. 6. 
FIG. 6 is a diagram corresponding to FIG. 4 in the form of the third 
embodiment. The form of the third embodiment possess an open type pressure 
reducing passage similarly to the form of the second embodiment, but the 
pressure reducing member is changed to the pressure reducing member 110 
which possess the pressure reducing passage 120 with many folded stages, 
to thereby provide a roller type pressure reducing member 200. 
In the roller type pressure reducing member 200, a linearly short pressure 
reducing passage 210 is provided from the opening 202 which is an inlet of 
the reinforcing cloth to the head 1. The pressure reducing passage 120 is 
formed with a height which has some allowance than the height of the 
aforementioned pressure reducing passage 100 with respect to the thickness 
of the reinforcing cloth 10. 
In the vicinity of the central portion of the pressure reducing passage 210 
are provided rollers 220, 222, and by transferring the reinforcing cloth 
10 by compressing each roller from the upper and lower side with these 
rollers, it is possible to secure the specified reduced pressure level in 
the reinforcing cloth supply passage 35 so as to easily send out the 
reinforcing cloth 10 easily. In the form of the present embodiment, 
rollers are provided in two stages in the front and rear but the roller 
arrangement is not limited thereto. 
In a device according to the form of the present embodiment, since the 
roller 220, 222 transfer the reinforcing cloth 10 while compressing it 
from the upper and lower side, it is possible to remove water or gas 
contained in the reinforcing cloth 10 by extruding it, to eliminate the 
void around the reinforcing cloth 10, it is possible that the outlet 204 
side of pressure reduction passage 210 can reduce the length of the 
pressure reducing passage while maintaining a specified pressure reduction 
in the reinforcing cloth supply passage 35. 
Therefore, it is possible to miniaturize the entire device. In addition, 
even when the thickness or width of the reinforcing cloth 10 is changed, 
the flexibility with respect to design change and the like is increased 
since the roller type pressure reducing member 200 can be used as it is in 
many cases without replacing the roller type pressure reducing member 200. 
Next, the form of a fourth embodiment will be explained according to FIGS. 
7 and 8. The fourth embodiment uses a roller type pressure reducing member 
300 which is the same as the third embodiment, but it can reduce the 
pressure more efficiently. 
FIG. 7 is a diagram corresponding to FIG. 6 roughly showing the whole 
composition. FIG. 8 is a exploded sectional view of the reinforcing cloth 
inlet portion of a roller type pressure reducing member 300, wherein the 
roller type pressure reducing member 300 is formed approximately in a box 
type and a inner space thereof forms a pressure reducing passage 310 from 
an inlet 302 of the reinforced cloth 10 to an outlet 304 of the head 1, as 
the same is outlined above, side. 
The reinforced cloth 10 is transferred by a sending belt 324, which is made 
of self-lubricating material such as fluorine resin, wound and hung 
between an inner roller 320 arranged in a pressure reducing passage 310 
and an outer roller 322 are arranged outside of the roller type pressure 
reducing member 300. 
The inner roller 320, the outer roller 322 and the sending belt 324 are 
arranged as two stages on and under the reinforcing cloth 10 to be a pair, 
the reinforcing cloth 10 is interposed between the upper and lower sending 
belts 324 in the compressed state, the upper and the lower rollers 320 and 
322 rotate in a reverse direction respectively and a portion compressed on 
the reinforcing cloth 10 between each of the upper and lower sending belt 
324 is moved in the same direction. 
The reinforcing cloth 10 is, after transferred by upper and lower sending 
belt 324, passed through the first to fifth idle roller 330, 332, 334, 336 
and 338 arranged in the pressure reducing passage 310 and sent off to the 
head 1 side. Where, the vacuum pump 316 is joined in the vicinity of the 
outlet 304. 
The second idle roller 332 located between the first and third idle roller 
can move freely according to a tension applied to the reinforced cloth 10 
and the moving amount is detected with a displacement meter 340. 
And hence, a tension detector 342 is arranged to the fourth idle roller 336 
for detecting a tension applied to the reinforcing cloth 10 and can be 
watched with a tension monitor 346. 
Tension control of the reinforcing cloth 10 is achieved by arranging a 
servo motor 344 on the lower side roller between the upper and lower main 
driving rollers, for example, the inner roller 320 for controlling the 
rotating speed according to the tension and changing the sending belt 
speed of the upper and lower sending belt 324. 
At the time, it is possible to control the servo motor 344 by either a 
displacement control or tension detection control based on a detected 
value of the displacement meter 340 or the tension detector 342 of by 
joint use of both controls. 
Besides, as is apparent from FIG. 8, the lower side of the upper stage 
sending belt 324 and the upper side of the lower stage sending belt 324 
enter into the roller type pressure reducing member 300 from the common 
inlet 302 together with the reinforcing cloth 10 and the upper side of the 
upper stage sending belt 324 and the lower side of the lower stage sending 
belt 324 enter into the roller type pressure reducing member 300 from a 
single inlet 306 and 308 respectively. 
Seal packages 350, 352 and 354 made of a material provided with 
self-lubrication and elasticity, for example, fluorine resin, are fixed on 
the inlets 302, 306 and 308, to almost tightly close the openings while 
permitting the sending belt 324 to slide freely. 
Thereby, since it is possible to seal the inlet 302, 306 and 308 which 
communicate with the pressure reducing passage 310 and the atmosphere with 
the seal packing 350, 352 and 354, even with the atmosphere open type, a 
sufficient pressure reducing level, for example below 600 mmHg, can be 
maintained in the pressure reducing passage. Also, as these seal packings 
have elasticity, the seal ability is improved. 
Besides, since the sending belt 324, the seal packing 350, 352 and 354 are 
composed of the self-lubricating material such as fluorine, a resistance 
on transferring of the reinforcing cloth 10 can be lessened and since it 
is not required to have large and excessive tension the tension applied to 
the reinforced cloth 10 for cutting or transferring of the reinforcing 
cloth 10 can be prevented and the transferring devices such as the motor 
can be made compact. 
Further, it is possible that the control of the tension applied to the 
reinforcing cloth 10 is done be either the displacement control or the 
tension detecting control based on the displacement meter 340 or the 
tension detector 342 or both of them, control can be achieved easily using 
many control methods. 
Still more, the present invention will not be limited to the form of these 
embodiments but can be changed into various forms, for example, it is 
possible to use a resin sheet made of suitable synthetic resin film and 
the like, substituting the reinforcing cloth. In this case, water or gas 
is likely to remain essentially on the surface of the resin sheet, but a 
good adhesion is obtained as mentioned above. 
EXAMPLE 
The following sample is prepared by the method and device based on the form 
of the first embodiment, and a comparative sample is prepared in almost 
the same manner. 
Sample: 
A knit is used as the reinforcing cloth, EPDM is used as the rubber for the 
plastic materials of the inside and outside, and a 300 mm long hose of 
30.5 mm inside diameter and 39.5 mm diameter is prepared as the sample by 
the method and device of the above. 
Comparative sample: 
For each of seven samples and comparative samples of the above, 
incompressible fluid of 95C flowed into the inside thereof, the 
incompressible fluid is repeatedly pressurized by impulse at the rate of 
40 cycles/min. between 0 to 4 kg/cm.sup.2, the number of pressurization 
until breakdown is measured, and the result is used as the number of limit 
durability. 
The following is the result of measurement. 
Test result: (Number of limit durability) 
______________________________________ 
No. Comparative Sample 
Sample 
______________________________________ 
1 13,375 356,812 
2 19,935 253,157 
3 9,826 219,354 
4 11,396 584,231 
5 4,521 412,687 
6 2,205 254,935 
7 43,567 613,549 
Log Average 9,520 357,562 
______________________________________ 
As is apparent from the test result, the average number of limit durability 
of the sample is remarkably improved approximately 36 times that of the 
comparative sample, and a performance has been obtained that can be 
sufficiently used as the fluid pressurizing hose for automobile in a 
hostile application. 
The invention being thus described, it will be obvious that the same may be 
varied in many ways. Such variations are not to be regarded as a departure 
from the spirit and scope of the invention, and all such modifications as 
would be obvious to one skilled in the art are intended to be included 
within the scope of the following claims.