JPH0318556Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in cable manufacturing equipment, in particular to equipment for cabling glass fiber systems, ie to manufacturing very long mesh elements from twisting together at least two strands.

The invention relates in particular to an improvement of the device described in French Patent No. 1208273.

This French patent provides for two sources 1 and 2 for each working position, as shown in FIG.
It is equipped with an assembly similar to a double untwisting spindle (or DT assembly) capable of twisting together two strands (yarns) A and B fed from a double untwisting spindle (or DT assembly). In this device, two supply bobbins 1 and 2 supplying the two strands A and B are arranged one above the other. Bobbin 1
The strands A supplied from the balloon pass through a similar rotary plate to form a balloon 4 in which a source 2 supplying the strands B is placed. The strands A and B are twisted together at the junction 5 and the cable 6 formed is wound in a conventional manner onto a winding bobbin 7, for example in the form of a pinwheel.

The supply of the two strands A and B constituting the cable is initialized by the winding speed at the winding bobbin 7. The resistance means 8 and 9 are
It is formed on each of the strands A and B in order to equalize the tension of the strands A and B and obtain parallel strand yarns.

The systems used to twist the two strands together at the junction 5 include, for example, an inverted U-shaped rotating ply head with arms of different lengths. This rotating ply head has two arms whose central portions are rotatably supported by ball bearings, and whose longer arm is hollow and has an opening formed at its tip. One of the strands is introduced into the arm through the opening and pulled out from the center of the rotating ply head, and the balloon of this strand provides rotational drive to the rotating ply head. The rotating ply head also has a pulley in which grooves are formed to guide the two strands, and twist is applied to the two strands from this pulley.

Although this type of device is generally satisfactory, it has been found that, particularly in the case of glass fiber systems, the tension fluctuations that tend to occur during winding of the cable induce irregularities and breakage of the thread.

Additionally, the system for joining the two strands was complex and made it easy to continue working if either strand broke.

The purpose of the present invention is to improve the above-mentioned cable manufacturing equipment in order to overcome the aforementioned drawbacks, in particular to provide a regular and constant tension on the strands, and furthermore to automatically stop the equipment in case of any breakage of any strand. It is to let

Generally, the cable manufacturing device according to the present invention differs from the above-mentioned French patent in the following points.

The two strands are arranged in the axis of the upper bobbin and are twisted in partial contact with the peripheral surface on a rotatably mounted twisting roller, and the twisted cable is wound up after passing through the passage of said twisting roller. The front is acted upon by a compensation system which is able to absorb tension fluctuations and to activate the stop means if one of the strands is cut.

According to a preferred embodiment of the invention, the tension compensation system comprises an arm which is pivotably mounted around a primarily fixed axis. The free end of this arm is formed with a guide pulley, on which, in normal operation, the cable is arranged to catch around one quarter of the rotating twisting roller. The arm is also free to pivot between two limit points on either side of the equilibrium point under the action of a tension-adjustable return spring (or equivalent). When these limit points are exceeded, this arm activates means for controlling the shutdown of the device.

Embodiments of the present invention will be described below with reference to the drawings.

With reference to the drawings, the cable manufacturing device according to the invention comprises two strands A and 2 fed from two sources 1 and 2 arranged one above the other, such as the device described in French Patent No. 1208273. An assembly similar to a double untwisting spindle is provided for twisting B together.

Strands A supplied from a source 1 are passed through a rotating assembly 3 forming a balloon 4 in which a source 2 supplying strands B is placed. These strands A and B are twisted together at the junction 5.

Each strand has a resistance system (resistance means)
8 and 9 are formed.

As clearly shown in Fig. 2, confluence point 5
In the example shown, it is constituted by an assembly comprising a twisting roller 10 which is rotatably mounted approximately in the axis of the bobbin 2 on the resistance system 9. The two strands A and B are brought together in contact with the peripheral portion of the twisting roller 10.

Of course, according to the present invention, the two strands are
They are twisted on the twisting roller 10, and the twisting roller 1
The cable with two strands twisted together on the 0 is not directly fed to the winding means, but passes over a compensating assembly whose construction and operation are as shown in FIG. This compensating assembly essentially comprises an arm 12 which pivots about a fixed axis 13. This rotating arm 1
2 is acted upon by a return spring 14 whose tension force can be adjusted, for example, by changing the position of the spring end 15. As shown in FIG. 3, this tension adjustment is carried out on the support member 16 through an assembly 17 which is slidably inserted through an opening 18 formed in the support member 16. can be obtained simply by fixing the spring.
The other end of the spring 14 is fixed to a base 20 at one end of the pivot arm 12. A guide pulley 11 around which the cable passes is attached to the other end of this arm 12. In the illustrated example, this compensating element is arranged in such a way that the cable passes over the twisting rollers 10 over one-quarter of its periphery and then turns approximately at a right angle and is pulled out around the guide pulley 11. Then, in normal operation, the compensation element is 2
It can be pivoted between two outermost positions and changes its position in relation to the tension reaction that occurs during winding. According to FIG. 3, the pivot arm 12 is shown partially in the middle position of the block line, but its outer limit positions are generally indicated by X1 and X2.

Of course, according to the invention, the compensating device is adapted to automatically activate means for stopping the operation of the device when one strand of the cable breaks. In fact, as shown in FIG. 3, if both stone lands break, the compensating element rotates to the position shown by the dash-dotted line (Y-axis), and the base 20 controls the stoppage of the device. Relay (switch means) 21
Activate. Furthermore, even if one of the two strands breaks, the tension on the cable is halved, so the pivot arm 12 returns to the spring 14.
The relay 21 is rotated by the action of the relay 21. When starting to operate the device in such a stop system, for example, a cam (not shown) is connected to the handle 23.
(see FIG. 2), and the rotating arm 12 may be configured to rotate against the force of the return spring 14.

This particularly simple device not only makes it possible to prevent defects from occurring in the resulting cable, but also makes it possible to twist yarns such as glass fiber yarns, which are sensitive to tension fluctuations that frequently break. It is.

[Brief explanation of the drawing]

1 is a schematic view of the working position of the cable manufacturing device according to the invention; FIG. 2 is a detailed view of the cable manufacturing device according to the invention, each symmetrically arranged on a support frame of a known type; and FIG. 3; 1 is a schematic cross-sectional view showing the manufacture and operation of a tension compensator used in a cable manufacturing apparatus according to the present invention; FIG. A, B... Stone land, 1, 2... Supply source (bobbin), 5... Merging point, 6... Cable, 7...
... Winding means, 8, 9 ... Resistance system (resistance means), 10 ... Twisting roller, 11 ... Guide pulley, 12 ... Compensation system.

Claims (1)

[Claims for Utility Model Registration] Two strand supply sources arranged in front and behind each other, resistance means arranged downstream of these supply sources and applying tension to the strands from each supply source, and these resistance means a compensating system that absorbs tension fluctuations in the cable after twisting and activates a switch means to stop the entire operation when the strand is cut; winding means for winding the cable from the compensation system, the strands being twisted in contact with the outer peripheral surface of the twisting roller mounted rotatably around a horizontal axis perpendicular to the axis; The compensation system includes an arm rotatably attached to a fixed shaft, a spring attached to one end of the arm, and a guide pivotally supported at the other end of the arm and maintaining the cable at a constant tension. A cable manufacturing device characterized by comprising a pulley.