JPH04189125A - Fiber looseness preventive device - Google Patents

Abstract

PURPOSE:To positively remove the looseness of fiber at an extremely quick response speed by providing holding means for elevationally holding a looseness preventive shaft, and weights detachably hung on both end parts of the looseness preventive shaft. CONSTITUTION:Guide rollers 64,64 are provided at a predetermined position between a filament winding part 58 and a resin impregnation bath 50. Between these rollers 64,64, roving fiber is made to hang down vertically in an approximately U-shaped manner, and on the roving fiber, a looseness preventive shaft 65 is provided slidably, and further weights 68 are hung on both ends thereof. In this way, looseness caused by a reverse travel of the roving fiber during the period of filament winding mold can be absorbed promptly positively.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a fiber loosening prevention device for a FW device for preventing loosening that occurs during filament winding (hereinafter referred to as FW) of fiber reinforced plastic (FRP). .

[Prior Art] A fiber loosening prevention device of a conventional FW device prevents loosening by vertical movement of a tension control roller (dancer roller).

In this case, the rotation of the roving fibers is electrically controlled by the lever principle. There are also some that use an air pressure loosening prevention device.

In this device, a lever is moved up and down by air pressure to prevent the fibers from loosening.

These devices will be explained in more detail with reference to the drawings.

For example, FIG. 4 is an explanatory diagram showing a device in which the tension of fibers is controlled by electrically adjusting the torque between rollers (see Japanese Patent Laid-Open No. 48-51973). In the figure, 1 is a carbon fiber, and 3.4 is a roller for controlling the tension of the carbon fiber.

2 is a metal core rubber coated roller with which the roller 3 is in contact. Further, 9 is a winding device equipped with a winding mold or mandrel, 6.8 is a guide roller, and 7 is a resin impregnating device.

Further, FIG. 5 is an explanatory diagram showing a device in which tension is applied by rollers (Japanese Patent Laid-Open No. 48-71477
(see issue). In the figure, reference numeral 11 indicates a thread that is dipped in the resin 13 in the resin tank 12, and the thread 14 impregnated with the resin 13 is wound around a mandrel 7 via a tensioning device 15. .

16 is a roller that is in contact with the circumferential surface of the mandrel 17.

Furthermore, FIG. 6 is an explanatory view showing a device in which a thread is wound around a tension roller and a tension roller with a brake to apply tension (see Japanese Patent Laid-Open No. 17480/1983). 32 in the figure is a heat-retaining tank containing the supplied epoxy resin 33. In the supplied Epoquine resin 33, an impregnating bath 30 is provided.
is immersed. Supply epoxy resin 3 in impregnation bath 30
3, a fiber bottle 31 is immersed therein. fiber bin 3
1, a fiber bundle is supplied from a tension roller 21 via a guide roller 20.

The tension roller 21 is connected to a brake-equipped tension roller 22 via a belt.

The tension roller 22 with a brake has a brake 23
A weight 24 is attached via.

In addition, in the figure, 26 is a steam electromagnetic valve, 27 is a controller, and 2
8 is a thermal lightning pair.

[Problems to be Solved by the Invention] The conventional fiber tension control means for the FW device as described above has the following problems. (1) Tension control means:
Since it is far from the FW section and is affected by the viscosity of the resin in the impregnation tank, there may be a time delay in response. Especially when the fibers move backwards, the slack in the fibers cannot be completely removed. Furthermore, the tension control means has speed dependence, and if the diameter of the roving fiber changes, the tension will fluctuate.

(2) Tension control using air pressure has particularly poor responsiveness.

(3) Tension control by adjusting the torque of the rollers cannot remove slack when the filament moves backwards.

The present invention has been made in view of this point, and provides a fiber slack prevention device that can reliably remove fiber slack with an extremely fast response speed.

[Means for Solving the Problems] The present invention includes a pair of guide rollers arranged in parallel at a predetermined interval, and a pair of guide rollers which are provided in an area between the guide rollers so as to be movable up and down, and which guide the filament to be treated along the circumferential surface. an anti-sag shaft that guides the roller from one side to the other;
a holding means for holding the loosening prevention shaft so that it can be raised and lowered;
The fiber loosening prevention device is characterized in that it includes a weight freely suspended from both ends of the loosening prevention shaft.

Here, the guide roller may be installed, for example, by attaching a guide frame to both ends of a support shaft provided on the entire surface of the fiber supply base, and sandwiching the upper part of a shaft guide groove formed along the longitudinal direction of the guide frame. is preferable.

Preferably, the loosening prevention shaft is fitted into the guide groove so as to be vertically movable via bearings at both ends thereof.

The holding means for the loosening prevention shaft may be constituted by a guide frame in which a shaft guide groove is formed, or alternatively, both ends of the loosening prevention shaft may be held by one end of the swinging lever, and the other end of the swinging lever may be held by one end of the swinging lever. The support column may be rotatably fitted loosely into the tip of the support column.

[Function] According to the fiber slack prevention device according to the present invention, a guide roller is provided at a predetermined position such as between the FW section and the resin impregnation tank,
Roving fibers are suspended between guide rollers in a roughly U-shape,
A loosening prevention shaft is slidably provided on the roving fiber, and weights are suspended from both ends of the shaft. For this reason, F
The slack caused by the backward movement of the roving fibers during W molding can be quickly and reliably absorbed.

[Examples] Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory diagram showing the main parts of a FW device that employs a fiber slack prevention device according to an embodiment of the present invention.

In the figure, 50 is an impregnation tank containing a predetermined resin.

The impregnation tank 50 is placed on a fiber supply base 56.

The fibers 51 to be wound around the peripheral surface of an object to be processed (not shown) such as an FRP container are wrapped around a guide roller 52 provided at the entrance of the impregnation tank 50, a guide roller 53 inside the impregnation tank 50, and a guide provided at the exit. Roller 54 and longitudinal guide roller 5
After being immersed in the resin from the fiber supply section 55 through the filament winding section 58 (hereinafter referred to as FW section 58) in which the object to be processed is provided,

A fiber loosening prevention device 60 is interposed between the FW section 58 and the fiber supply base 56. FIG. 1(A) is a front view of the fiber loosening prevention device, and FIG. 1(B) is a side view of the same fiber loosening prevention device.

Reference numeral 61 in the figure represents a pair of guide frames constituting the fiber loosening prevention device 60. The guide frame 61 is attached to both ends of a support shaft 62 provided substantially horizontally on the entire surface of the fiber supply base 56. A shaft guide groove 63 is bored in the guide frame 61 along its elongated direction. At the top of the guide frame 61, a plurality of fibers 51 (12 in this example) drawn out from the vertical guide roller 57 are placed in the FW section 5.
A pair of guide rollers 64 for guiding the shaft to the shaft 8 are attached to sandwich the shaft guide groove 63.

Both ends of a loosening prevention shaft 65 are fitted into the shaft guide groove 63 via bearings 66 so as to be vertically movable. A large number of guide grooves 67 are formed at predetermined intervals on the circumferential surface of the loosening prevention shaft 65 to prevent the fibers 51 leading to the FW section 58 from getting entangled with each other.

A weight 68 is suspended from both ends of the loosening prevention shaft 65. The weight 68 is constructed by attaching a plurality of weights 70 to a holding rod 69 that is locked to the shaft of the anti-sagging shaft 65. That is, by changing the number of weights 70 attached to the holding rod 69, the force for pushing down the loosening prevention shaft 65 is adjusted, thereby finely adjusting the amount of slack in the fibers 51 that can be absorbed.

Note that as a means for holding the loosening prevention shaft 65 in a vertically movable manner, a guide frame 6 in which a shaft guide groove 63 is formed is used.
In addition to 1, for example, as shown in FIG. Pillar 7
A shaft elevating mechanism 75 configured by loosely fitting into the rotating shaft 73 provided at the tip of the shaft 2 may be employed.

Although the fiber slack prevention device 60 is provided between the FW section 58 and the fiber supply base 56 in the above description, it is preferable to set it at an appropriate position depending on the specifications and the like.

According to this fiber slack prevention device, the following effects are achieved.

(1) By installing this device near the FW section,
Loose fibers can be quickly removed.

(2) By installing this device near the outlet of the impregnation tank,
It is possible to eliminate the response delay when feeding fibers due to the viscosity of the resin.

(3) By attaching a weight between two adjacent guide rollers, it is possible to remove slack in the fibers by twice the amount of movement of the weight.

(4) The loosening prevention force can be finely adjusted by adjusting the number of weights included in the weight.

(5) To remove slack in the fibers by the weight of the weight,
The response speed when absorbing slack is fast, and the device has a simple structure and can be manufactured at low cost.

[Effects of the Invention] As explained above, the fiber loosening prevention device according to the present invention can prevent fiber loosening at an extremely fast response speed.
This has remarkable effects such as being able to remove it reliably.

[Brief explanation of drawings]

Figure 1 (A) is a front view of the fiber loosening prevention device, and Figure 1 (A) is a front view of the same fiber loosening prevention device.
B) is a side view of the fiber loosening prevention device, FIG. 2 is an explanatory diagram showing the shaft lifting mechanism, and FIG. 3 is a main part of the FW device that employs the fiber slackening prevention device of one embodiment of the present invention. FIGS. 4 to 6 are explanatory diagrams showing the configuration of a conventional fiber loosening prevention device. 60... Fiber loosening prevention device, 61... Guide frame, 62... Support shaft, 6
3... Shaft guide groove, 64... Guide roller,
65... slack prevention shaft, 66... bearing,
67... Guide groove, 68... Weight, 69...
...Holding rod, 70... Weight, 71... Rocking lever, 72... Support column, 73... Rotating shaft, 75... Lowering mechanism.

Claims (1)

[Claims] A pair of guide rollers arranged in parallel at a predetermined interval, and a loosening prevention shaft provided in the area between the guide rollers so as to be able to rise and fall freely and guide the fibers to be processed from one of the guide rollers to the other along the circumferential surface. A fiber loosening prevention device comprising: a holding means for holding the loosening prevention shaft so as to be movable up and down; and a weight removably suspended from both ends of the loosening prevention shaft.