JPS6211148Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cable reel that is particularly suitable for use in a power supply system for mobile devices that uses a control system signal transmission path.

Generally, this type of cable reel has a reel body that is rotatably supported on a shaft and has a required rotational force applied to it by a spiral spring, etc., and a cable reel that is rewound and reeled using the rotational force applied to the reel body. The reel body is installed on one side between the mobile device and the power supply unit, and the distal end of the wound cable is attached and connected to the other side. As the cable moves, the cable is fed out and extended, or rewound and wound to supply power.

By the way, according to such a cable reel, when the wound mobile cable is boarded on a mobile device, the unwinding end of the cable is connected to the fixed cable wired inside the device, while the tip of the cable is connected to the mobile device. When connected to the power source, it is necessary to connect to the fixed side cable that is routed from the power supply side to supply electricity, but this connection must take into account the rotation of the reel.

Conventionally, a contact rotation energizing mechanism, that is, a slip ring device, has been frequently used to connect the rotating side and the stationary side of such cables.

However, according to this slip ring device, each cable core requires at least one slip ring and a pair of current collector brush that slides into contact with this ring. As the number of cable wires increases, the additional equipment for the reel tends to become bulky, which is clearly disadvantageous in terms of making mobile equipment more nimble and reducing the area of equipment.

In recent years, the number of mobile devices that are equipped with a variety of operating functions has increased, and in order to satisfy these functions, the number of cable wires for mobile power supply has increased to more than 50 cores, and These wire cores are responsible for supplying power and signals, and the signals used are often delicate signals such as pulse signals.

In such a situation, if a slip ring device is employed, the following problem will occur.

In other words, when a pulse signal is used as a supply signal, the noise that often occurs between the current-carrying parts of the slip ring body and the current collector brush may be mixed into the signal, leading to malfunction of the equipment, and also over a long period of time. When handling a large number of parts, the collector brushes (usually carbon black) tend to wear out, causing frequent noise and sparks due to instantaneous disconnection. Maintenance is not easy. Conventionally, a so-called slip ring-less cable reel with a non-contact rotating energizing mechanism has been developed to solve the technical problems of slip ring devices, and it is already known that it has excellent energizing performance.

The main component of this non-contact rotating energization mechanism is a flexible twisted connection wire, which allows the rotation of the reel body by the rotational twist allowed by the connection wire itself, and allows the moving cable to move. It has a configuration that enables power supply by.

Therefore, when connecting a connecting wire between a movable side cable and a fixed side wiring cable, conventionally the abutting connecting line is routed through the cable without being protected, or it is wired while housed in a flexible tube. For this reason, the connecting wire itself tends to become slack, and the rotational twist of the connecting wire due to the rotation of the reel is not uniform, and one-sided twist tends to occur intensively at the slack portion. Ta. When the number of cable wires is small, the connecting wire itself can be chosen to have any size, in other words, a relatively large one, so that such single twisting has little practical effect.

However, when the number of wire cores required for a cable increases, the number of twists of connecting wires also increases, and small-sized cores must be used in order to maintain sufficient flexibility. In such a case, it is expected that the one-way twist applied to the connecting wire will increase the local fatigue of each wire core, increasing the rate of wire breakage and making the wire unusable.

The present invention was devised in view of these points, and is based on a cable reel in which a movable cable containing a large number of insulated wire cores is unwound. The object of the present invention is to provide a cable reel of this type which prevents the connecting wire from being twisted one-sidedly when using a mated connecting wire, and which fully utilizes the effectiveness of the non-contact rotating energizing mechanism.

In other words, the cable reel of the present invention has a plurality of twisted flexible insulated conductors connected at one end to a fixed wiring cable and at the other end to a movable cable wound around the reel. It is arranged through a rigid pipe,
One end of the flexible insulated conductor is attached and fixed to a fixing fixture coaxially fixed to one end of the rigid tube, and the other end of the flexible insulated conductor is connected and supported by the reel and fixed to the rigid tube. It is characterized in that it is configured to be attached and fixed to a rotating retainer disposed on an extension of the axis.

The following points should be taken into consideration when applying the above-mentioned twisted flexible insulated conductor.

In other words, since the transfer range of the moving device is finite, the number of rotations of the reel when the moving cable is fed out or reeled out is also finite as the device moves. Therefore, a twisted state is created in which twisting can be tolerated within this reel rotational speed range. The best way to create this twisted state is as follows. In other words, as shown in the example of use in FIG. Assume that the reel rotates 2N. At this time, if the intermediate point C is a position where the reel has made N rotations from point A, the connecting insulator will not be twisted when the reel 2 is located at this point C. The torsion of the insulated conductor caused by the rotation of the reel is rotated equally on the left and right sides, and by minimizing the twist, it is useful for improving the life of the insulated conductor itself.

FIG. 2 shows an embodiment of the cable reel of the present invention, in which 10 is a take-up reel, which is mounted on a rigid tube 12 made of, for example, a steel tube, which is fixed to a stand 11 with screws at one end and is placed horizontally. bearing 13,
13 is rotatably supported, and a rotational reaction force is obtained by a spiral spring 14 fixedly wound between the reel body and the tube 12, respectively. Reference numeral 15 denotes a moving cable wound around the reel 10, whose winding start end side is once led out from the winding trunk of the reel 10, and then guided and connected to the connector 16 attached to the outside of the reel 10. Yes, reel 10
The rotation reaction force is used to unwind the film.

Reference numeral 17 is a fixed cable wired to the power supply side or the mobile device side, and one end thereof is led and connected to a connector 18 attached to the stand 11 or the like. Further, 20 is a twisted flexible insulated conductor for connecting and energizing, which is passed through the rigid tube 12, and one end thereof is led to and connected to the rotating connector 16, and the other end is fixed. It is connected to the connector 18 on the side, and serves as a current-carrying path between the movable cable 15 and the fixed cable 17. The twisted flexible insulated conductor 20 is
One end is fixed to the end of the rigid tube 12 on the support side, and the fastening hole 2 of the retainer 21 is fixedly arranged substantially coaxially.
The tube 12 is pulled into the tube 1a and held therein, and the other side is attached to the bracket 23, which is attached to the outer side of the reel 10 via a connecting rod 22 and is disposed opposite to the open end of the rigid tube 12.
The center of the hole is positioned at the axis 30 of the rigid tube 12, and the clamping device 24 is pulled into the tightening hole 24a and held, thereby maintaining a predetermined tension in the rigid tube 12 in any twisted state. They are arranged in a straight line while giving

The retaining devices 21 and 24 are, for example, two-part metal fittings each having a semicircular recess and a flange on the outer side, and the insulated conductor 20
When tightening, it is done by fitting and assembling the respective recessed parts on the outer side of the insulated conductor 20 via rubber brushings, and then tightening the respective metal fittings together with bolts. Good.

In addition, in the drawing, 25 is a binding wire that binds the insulated conductors 20 pulled out from the retainer 24;
26 passes the moving cable 15 through the bushing 27, and connects the connector 16 and the insulated conductor 20.
The inspection lid 26a is a frame that protects the rotating parts of the machine. Reference numeral 28 is a frame for allowing the cable 15 on the fixed side to pass through the lead-in port 29 and protecting the fixed wiring portion of the connector 18 and the insulated conductor 20, and also includes an inspection lid 28a.

Since the present invention is constructed as described above, when the stand 11 is installed on a mobile device and mounted on the tower, the fixed side cable 17 is guided into the device and used for wiring, while the feeding end of the mobile cable 15 is is connected to the power supply box (see Fig. 1, 4), and from the power supply box, which becomes the power supply side, is connected to the moving cable 15.
Furthermore, a configuration is taken in which power is supplied to the device via the twisted flexible insulated conductor 20. Then, as the device moves away from the power supply box, the moving cable 15 is unwound, and as the device approaches the power supply box, the moving cable 15 is unwound by the rotational force accumulated in the reel. As the reel 10 rotates as the cable 15 moves, the retainer 24 rotates about the axis 30 of the rigid tube 12 via the connecting rod 22 and the bracket 23, and the rotating retainer 24 and one of the retainers rotate. Fixed side retainer 2
1, the twisted flexible conductor 20 itself stretched in a straight line is rotated in the direction of twisting or untwisting along the axis 30 within the rigid tube 12. Therefore, the rotation applied to the flexible insulated conductor 20 can be applied evenly over the entire length between the opposing clamps on the coaxial line without forming any slack that would cause unreasonable twisting within the rigid tube 12. Therefore, there is no need to concentrate twisting locally and cause local fatigue.

The present inventor conducted the following test in order to confirm the above-mentioned twisting situation over time.

First, we adopted ^two 0.75mm cores from a 300V vinyl cabtire cable as a flexible insulated conductor.We used 54 cores, each independent of the other, that is, without mutual twisting, and having a length of 389mm and pulling both ends through connectors. I fastened it, stretched it in a straight line, and then rotated one of the retaining parts back and forth by ±2.5 turns at a rotation speed of 33R, P/N. Even after making 12,000 round trips, there were no abnormalities.

In addition, 0.75mm ² cores of the same 300V vinyl cabdia cable are used, and each of the 50 cores is untwisted, and the diameter φ is fixed in advance.
40, passed through a 110mm long steel pipe, total length 470mm
After binding both ends with PVC tape, I stretched it in a straight line between the fixed metal fitting and the rotating metal fitting, and then I tried to make it reciprocate at the same rotational speed and number of rotations as in the above test row.

Even after making an astonishing 61,000 round trips, no abnormalities were observed.

As is clear from the above results, the present invention can be used to connect and rotate energize a large number of supply cores without sacrificing overall flexibility using a large number of thin flexible insulated conductors. By adopting this configuration, it was confirmed that the fatigue exerted on the flexible insulated conductor was minimized, and that it was possible to provide a slip-ringless cable reel that had no practical problems and was highly reliable over a long period of time.

Incidentally, it is practically preferable for the flexible insulated conductor used in the present invention to have a stranded wire structure. Furthermore, when changing the number of flexible insulated conductor wires, etc., it is only necessary to release the retainer, release the connections at the connector connecting portions at both ends, and pull out the flexible insulated conductor from the inside of the rigid tube.

Further, in the above embodiment, the connector and the retainer are arranged separately, but it is within the practical range to connect the connector to the rear of the retainer.

As explained above, according to the cable reel of the present invention, when a moving cable having a large number of supply cores such as power or signal cores is energized with a fixed side using a connecting wire, the connecting wire It is highly reliable and safe, with minimal fatigue and no disconnection even during long-term use, and is also practical as the compact wiring of the connecting wire can be utilized as is. A contactless rotational energization method with high efficiency has been achieved, and a cable reel with high utility value can be provided, which is highly effective.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing how to use the cable reel, and FIG. 2 is an explanatory diagram showing, in partial cross section, one embodiment of the cable reel of the present invention. 10... Reel, 12... Rigid tube, 13... Bearing, 15... Moving cable, 16, 18... Connector, 17... Fixed cable, 20... Twisted flexible insulated conductor, 21, 24... ...Retainer, 30...
...Axis of rigid tube.

Claims (1)

[Scope of utility model registration request] A reel for rewinding and rewinding a moving cable containing a large number of cores is rotatably supported on a fixed rigid tube. A fixing device comprising a number of twisted flexible insulated conductors each connected to a movable cable, and one of the flexible insulated conductors is coaxially fixed to one end of the rigid tube. The insulated conductor is attached to and held by a retaining device, and the other end of the insulated conductor is attached to and held by a rotating retaining device that is connected and supported by the reel and is arranged on an extension of the axis of the rigid tube. A slit springless cable reel.