JPH0721477Y2 - Cable reel - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a cable reel for a cable (including hoses) for supplying power and signals to a moving device, and particularly, pays out the cable from the cable reel. The present invention also relates to a cable reel having a simple structure capable of preventing the cable from being twisted when winding the extended cable, and being advantageous for transmitting a weak signal.

[Conventional technology]

Cable reels for cables that supply power and signals to moving equipment, such as robots for in-pipe inspection used to inspect various pipes installed in power plants, etc., are fixed and fixed. From the position, the cable is reeled out from the position by the drum rotation of the cable reel or the unwound cable is wound up to correspond to the movement of the robot, but in order to ensure the transmission and reception of signals, the following two basic functions are generally used: (I) Since the terminal on the opposite side of the cable payout side is connected to a fixedly installed control device, etc., it must not be affected by the cable payout or cable winding operation and must not move significantly. . (Ii) When the cable is unwound from the cable reel or the unwound cable is wound up, the cable should not be twisted due to the rotation of the drum. Is required. In order to meet this requirement, the structure of the drum of the cable reel is changed from the conventional structure in which a cable with a circular cross section is spirally wound to a structure in which a flat cable is wound in a layered structure, or a circular shape is formed on the same hollow shaft adjacent to each other. A drum in which a cable having a cross section is spirally wound, and an intermediate reel provided between the drum and the stationary output circuit are arranged, and an intermediate reel and a ribbon-shaped intermediate wound around the intermediate reel in a layered coil shape. The cable and the drum are rotated in the same direction at the same time as the rotation of the drum, and the effective average radius of winding of the ribbon-shaped intermediate cable is increased or decreased at the time of rotation so that the intermediate cable connected to the stationary output circuit is There is a device in which twisting does not occur (see, for example, JP-A-58-28183).

[Problems to be Solved by the Invention]

In the structure in which a flat cable is wound in layers on the drum of the cable reel, the cable wound on the drum and the control device fixedly installed are connected to each other by a slip ring provided at the end of the rotating shaft of the drum. Will be connected via. However, since the inspection signal from the robot or the like is a weak signal such as an ultrasonic output signal obtained by using an ultrasonic probe, the signal accuracy is significantly reduced due to the high frequency noise generated by the slip ring. However, there is a problem that it cannot be put to practical use.

On the other hand, in the cable reel shown in the example of the above-mentioned JP-A-58-28183, as described above, the intermediate reel is provided adjacent to the drum of the cable reel, and the cable reel is wound around the drum to be fed out or wound up. Root terminal,
Since the intermediate reel is connected to one end side of a ribbon-shaped intermediate cable wound in a layered coil shape, the drum and the intermediate reel are simultaneously rotated in the same direction. The intermediate cable is not twisted, and the twisting does not occur, so that the slip ring is not used, and the problem caused by the noise generated by the slip ring is eliminated. However, in this example, in addition to the drum, the intermediate reel, the intermediate cable wound on the intermediate reel, the means for holding the intermediate cable concentrically when the intermediate reel rotates, the means for connecting the end of the intermediate cable to the stationary output circuit. And so on,
There is a problem that the structure of the entire cable reel becomes complicated and the moving distance of, for example, a robot or the like connected to the tip of the cable is limited by the length of the intermediate cable.

In view of the above-mentioned problems of the prior art, the present invention prevents twisting of a cable wound on a drum of a cable reel and eliminates the need for a slip ring, and further, a control device fixedly installed with the cable wound on the drum. It is an object of the present invention to provide a cable reel having a simple structure capable of being directly connected to each other without using the intermediate reel or the intermediate cable.

[Means for Solving the Problems]

In order to achieve the above object, the cable reel of the present invention is fixed at a fixed position where a cable wound around a drum is unwound by the rotation of the drum, and the unwound cable can be unwound from the unwound side. In the cable reel, one rotatable side plate having a rotation shaft fixed to the center and one end fixed substantially vertically to the peripheral portion of the side plate opposite to the shaft fixing surface. A drum formed by a plurality of bars and a stand for pivotally supporting the shaft of the drum are provided, and a cable wound around the drum is sequentially wound around the bar fixed to the drum in a figure-eight shape. The cable wound around the drum is sequentially removed from the cable located on the free end side of the bar by continuously rotating the cable by about 180 ° alternately in the forward and reverse directions, and the cable is wound in the opposite direction. Le, is obtained by the configuration allowing winding in order to 8 shaped in the drum by rotating the drum by about 180 ° in the positive and negative alternately.

Further, it is effective to provide a weir for preventing the cable from freely falling off at the free end of the bar fixed to the drum.

[Action]

Since the cable reel of the present invention is constructed as described above, the cable wound around the fixed bar of the drum in the shape of a figure of 8 continuously and alternately moves the drum in the forward and reverse directions. By rotating each 180 °, the bar is sequentially removed from the free end side and fed out. The cable during this feeding, for example, when the drum is rotated in the positive direction by about 180 °, twisting by the rotation angle is generated by the rotation, but the following rotation by about 180 ° in the reverse direction causes the twist. Since the same amount of twist is generated in the direction opposite to the twist due to the forward rotation, the twist due to the forward rotation is returned to the original state without twist. In this way, by rotating the drum alternately in the forward and reverse directions by about 180 degrees, the twist of the cable being fed out will be canceled,
It is possible to pay out the cable without twisting.

On the contrary, when winding the unwound cable, as in the case of unwinding the above cable, the drum is continuously rotated alternately in the forward and reverse directions by about 180 °, and the cable is rotated at each rotation. Hook it on the free end of the bar that is fixed to the bar, and wind the hooked cable around the bar in the shape of a figure. Therefore, also in the case of this winding, the twist of the cable is canceled as in the case of the above-mentioned feeding,
It is possible to wind the cable without twisting.

In addition, when the drum is rotated about 180 °, some allowance should still be provided for the above-mentioned cable feeding and winding, to the length of the cable connecting the drum and the fixedly installed control device. As a result, it can be performed without applying the tensile force of the cable.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. In the figure, reference numeral 1 is a side plate, and a shaft 2 for rotating the side plate 1 is fixed to the center of the side plate 1. 3a and 3b are bars, and bar 3
A round bar, a square bar, an elongated plate having an arc shape, or the like is used as a and 3b, and one end side thereof is fixed to the peripheral portion of the side plate 1 opposite to the shaft 2 fixing face substantially perpendicularly to the side plate 1. Although the figure shows only one pair of bars 3a and 3b, a plurality of bars may be arranged to face each other. 4a is a flange attached to the free end of the bar 3a, which is larger than the outer dimension of the bar 3a (for example, the bar 3a is larger than the outer size of the bar 3a so that the cable wound between the bars 3a and 3b does not fall freely). In the case of a circular cross section with a diameter d, the diameter of the flange 4a is set to 2d or 3d) so that it has a weir function. 4b is a flange attached to the free end of the bar 3b and has the same dimensions as 4a. 5
Is a drum formed by the side plate 1, the shaft 2, the bars 3a and 3b, and the flanges 4a and 4b. Reference numeral 6 is a frame that supports the shaft 2 of the drum 5, and reference numeral 7 is a base on which the frame 6 is vertically erected and integrally attached. The frame 6 and the base 7 form a stand 8. Reference numeral 9 is a cable wound around the bars 3a and 3b of the drum 5 in a figure-like shape, 9a is a terminal of a cable connected to a moving device such as a robot, and 9b is a fixed installation not shown. It is the end of the cable on the side connected to the control device. The cable 9 is wound around the drum 5 alternately about 180 ° (about 1/2 rotation) in the clockwise direction (hereinafter referred to as the forward direction) and the counterclockwise direction (hereinafter referred to as the reverse direction) indicated by the arrow in the drum 5. When each of them is rotated, the cable 9 wound in the shape of 8 is fed out while being sequentially deviated from the position of the flange 4a or the flange 4b, or
The extended cable 9 is hooked in order from the position of the flange 4a or the flange 4b to the bar 3a, 3b.
It is designed so that it can be wound in a figure 8 shape between them.

Therefore, when the drum 5 is continuously rotated alternately in the forward and reverse directions by about 180 °, the cable 9 is connected to the bar 3a or 3b.
At the free end, that is, at the position of the flange 4a or 4b, is removed in order from the lower side (base 7 side) by rotation and is paid out from the drum 5, and conversely, hooked by hooking the paid-out cable 9 in order. Cable 9
Is wound between the bars 3a and 3b in the order of figure 8.
The cable 9 during the feeding or winding is
Twist is generated by the rotation of the drum 5, but the same amount of twist is generated when the drum 5 is rotated about 180 ° in the forward direction and about 180 ° in the opposite direction.
And since the twisting directions are opposite, they are offset each other, and eventually the work is performed without twisting. In this case, the length of the cable 9 connecting the drum 5 and the fixedly installed control device should be slightly longer so that the tensile force does not act on the cable 9 even if the drum 5 is rotated about 180 °. Be prepared with a margin.

Since the cable 9 can be unwound or wound up without being twisted, the connection between the cable 9 and the fixedly installed control device can be directly performed without using a slip ring, and noise is less generated. It becomes possible to make it a cable reel. Further, the configuration is a simple one including the drum 5 and the stand 8 each having a simple structure with a small number of parts as described above, and it is not only inexpensive, but also when the signal line is increased due to a system change or the like. Suffices to bundle a newly added cable with the current cable, and has the effect that no slip ring or junction box is required. Furthermore, regarding the moving distance of mobile equipment such as robots, increase the size between the bars 3a and 3b, or select the length of the bars 3a and 3b and wind the cable of the length corresponding to the moving distance. It becomes possible to deal with the travel distance without being restricted.

The rotation of the drum 5 depends on the dimensions of the drum 5 and the cable 9
Whether it is manual or power is selected according to the weight of the cable, and the removal of the cable 9 from the bars 3a and 3b and the hooking of the cable 9 to the bars 3a and 3b are determined by the dimensions of the drum 5, the cable 9 and Depending on the weight and the like, it is selected whether to perform it manually or to provide another device.

[Effect of device]

Since the present invention is configured as described above, the configuration is extremely simple and does not cause the cable to be twisted when the cable is paid out from the drum or wound on the drum. Therefore, it is possible to directly connect the drum and the fixedly installed control device with a cable without using a slip ring or an intermediate reel.

In addition, the weir provided at the free end of the bar fixed to the drum has the effect of preventing free fall from the bar at the time of paying out or winding up the cable and being able to perform paying out or winding in order at the free end of the bar. Have.

[Brief description of drawings]

FIG. 1 is an overall perspective view showing an embodiment of the cable reel of the present invention. 1 ... Side plate, 2 ... Shaft, 3a, 3b ... Bar, 4a, 4b ... Weir (flange), 5 ... Drum, 8 ... Stand, 9 ... Cable.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Eiji Minamiyama Eiji Minamiyama 650 Jinrachi-cho, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. Tsuchiura Plant (72) Creator Yoshikazu Hamasaki 1952, Shingu, Kasuya-gun, Fukuoka Prefecture Machinery Co., Ltd. Kyushu Branch (72) Inventor Shigenori Kishi 650 Jinrachicho, Tsuchiura City, Ibaraki Prefecture Tsuchiura Plant, Hitachi Construction Machinery Co., Ltd. (56) References: 2-18468 (JP, U)

Claims (2)

[Scope of utility model registration request] 1. A cable reel fixed to a fixed position where a cable wound around a drum is unwound by the rotation of the drum, and the unwound cable can be wound from the unwound side. A drum formed by one rotatable side plate having the shaft fixed thereto and a plurality of bars having one end fixed substantially perpendicularly to the peripheral portion of the side plate opposite to the shaft fixing surface. And a stand for supporting the shaft of the drum, and a cable wound around the drum is sequentially wound around a bar fixed to the drum in a figure 8 shape, and the drum is continuously alternated in forward and reverse directions. The cable wound around the drum is rotated 180 degrees at a time, and the cable is unwound from the cable located on the free end side of the bar in order, and the cable is wound around the drum alternately in the forward and reverse directions at about 180 °. Each A cable reel characterized in that the cable reel can be sequentially wound around the drum in a figure 8 shape by rotating the drum. 2. The cable reel according to claim 1, wherein a weir is provided at the free end of the bar fixed to the drum to prevent the cable from freely falling off.