JPH024882B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the provision of a cable reel device that is particularly advantageous when transmitting signals such as control signals and video signals to and from unloaders, cranes, and other moving objects.

In recent years, the automatic control operation of unloaders, cranes, etc. has progressed, and for this reason, many transmission systems have been adopted that utilize signal transmission not only for power supply to the power section but also for remote control.

By the way, when transmitting both power and signals using a cable reel, a cable reel device is used in which a communication power composite cable containing both a power line and a signal transmission line is wound.

However, in conventional general cable reel devices, slip springs are used to connect the cable wound on the reel and the moving object or cable on the ground transmission side to be connected while allowing the reel to rotate. Equipment is heavily used.

However, when transmitting signals using a cable reel with a slip ring device, there is a risk of equipment malfunction due to noise generated by the mutual sliding of the slip ring and brush.In addition, the transmission speed is slow and the power line It had drawbacks such as being susceptible to damage.

In view of such prior art, the present invention aims to achieve signal transmission by using an optical rotary joint in place of the slip-ring mechanism.

By the way, as already proposed, the optical rotary joint mainly consists of two components that rotate relative to each other around the same axis, one of which is connected to the fixed side and the other to the rotating side. Since optical coupling is performed by propagating optical signals between elements, it achieves high transmission speed and highly reliable signal transmission. It is difficult to respond to various signal transmissions.

The purpose of the present invention is to increase the efficiency of transmission and reception and to provide a diversified system capable of handling different types of signal transmission such as control signals and video signals, based on the premise that the optical rotary joint, which is difficult to cope with multipolarization as described above, is adopted. It is an object of the present invention to provide an octopus-type cable reel device.

That is, as shown in the attached FIG. 1, the cable reel device of the present invention includes a drum-shaped shaft 3 provided with flanges 4, 4 on the periphery to form a winding drum for the cable, and a drum-shaped shaft 3 formed from one side of the shaft 3. It consists of a reel 2 having a cylindrical shaft body 6 extended and protruded while the rotation axes are aligned, and the cylindrical shaft body 6 of the reel is rotatably penetrated and extended inward. It has a housing 52 that is pivotally supported and fixed to a stand,
One optical rotary joint 10A is connected and provided between the side wall of the housing 52 and the end of the cylindrical shaft body 6, while one end is fixed to the housing 52 and bypasses the flanges 4, 4. A tubular fixed arm 80 is provided at the other end of the drum-shaped shaft 3 on the other side of the drum-shaped shaft 3 so as to coincide with the rotation axis of the shaft and spaced apart from each other. Another optical rotary joint 10B is connected to the side surface, and the cable wound on the drum-shaped shaft between the collars 4 and 4 is provided with different terminal devices 60 and 61 at the unwinding end. The winding start end of one of the optical fibers 8A is drawn into the drum-shaped shaft 3 and passed through the cylindrical shaft 6 to the one end. At the same time, the winding start end of another optical fiber 8B is drawn into the drum-shaped shaft 3 and connected to the rotation side of the other optical rotary joint 10B. The optical fiber 8A', which has one end connected to the fixed side of the one optical rotary joint 10A, is connected to one end station 90, and one end is connected to the fixed side of the other optical rotary joint 10B. is connected to the fixed arm 80 and connected to another terminal device 91 different from the one terminal device 90 by an optical fiber 8B' led out from the fixed end of the arm. It is characterized by

FIG. 1 shows a preferred embodiment of the cable reel device of the present invention. In this embodiment, the cable reel device is mounted on a mobile machine 50 such as an unloader, and the device 1 is used for combined communication power transmission. Available as a cable reel.

The reel 2, which forms the framework of the device, is equipped with a drum-shaped shaft 3. Flanges 4, 4 are provided around the body of the shaft 3, and a cable 5 is wound between them. One end of a cylindrical shaft 6 is fixed to the central shaft portion of one side wall of the shaft 3.

The cylindrical shaft 6 extends and projects along the rotational axis of the reel 2 by being fixed to the drum-shaped shaft 3.

On the other hand, a cylindrical housing 52 is fixed to a stand 51 installed on the mobile machine 50.
The cylindrical shaft 6 of the reel is passed through one side wall of the housing 52 to house the shaft 6 therein, and a ball bearing or the like is interposed between the shaft 6 and the one side wall of the housing 52. By communicating with each other, the cylindrical shaft body 6 is rotatably mounted on the housing 52. Therefore,
The reel 2 is rotatably supported on a protruding shaft with respect to the housing 52.

In connection with the rotational movement of the reel 2, it goes without saying that a rotational force is applied to the cable 5 by a drive mechanism such as a spiral spring or a motor so as to constantly wind the cable 5.

The cable 5 has a structure in which an arbitrary number of power lines 7 and two optical fibers 8A and 8B as signal transmission lines are arranged in parallel and covered with a common sheath 9, and the unwinding end is fixed. The device is fixed, and the end of the power line 7 is connected by connecting the power supply part, and the two optical fibers 8A and 8B are separately connected to different fixed side terminal devices 60 and 61, respectively. .

The cable 5 thus connected is connected to the mobile machine 50 via a predetermined rotary joint in order to achieve the predetermined connection while allowing rotation of the reel.

That is, the slip ring 70 is attached on the circumference of the cylindrical shaft body 6 within the housing 52,
A brush 71 that is in sliding contact with the outer peripheral surface of the slip ring 70 is fixedly supported on the housing 52 side, and a power line drum-shaped shaft 3 and a cylindrical shaft 6 are led out from the winding start end of the cable 5 wound on a reel.
A lead wire 72 led out from the brush 71 is connected to the power part of the mobile machine 50 through the inside of the brush 71.

On the other hand, the end closing wall 6a of the cylindrical shaft body 6 and the side wall 52a of the housing 52 facing on the extension of its central axis.
A first optical rotary joint 10A is connected and arranged between the two. Further, an annular arm 80 is provided with one end fixed to the housing 52 and extended so as to go around the collars 4 of the reel 2, and the other end 80a is attached to the outer wall of the drum-shaped shaft 3. These arms 80 are spaced apart and facing each other on the extension of the rotation axis.
A second optical rotary joint 10B is connected between the other end 80a and the side wall of the drum-shaped shaft 3.

Then, 1 derived at the winding start end of the cable 5
A book optical fiber 8A is connected to the rotating side of the first optical rotary joint 10A through the drum-shaped shaft 3 and the cylindrical shaft 6, and another optical fiber 8B is connected to the drum-shaped shaft 3 and the cylindrical shaft 6. It is introduced into the shaft 3 and connected to the rotating side of the optical rotary joint 10B, which connects the drum-shaped shaft 3 to the outer wall.

An optical fiber 8A', one end of which is connected to the fixed side of the first optical rotary joint 10A, is connected to one mobile terminal device 90 mounted on the mobile machine 50. On the other hand, the optical fiber 8B', one end of which is connected to the second optical rotary joint 10B, is passed through a tubular fixed arm and led out from the fixed end side of the arm, and is connected to a terminal different from the mobile terminal station 90. A parallel connection is made to another mobile terminal device 91.

As is clear from the above description, the two optical fibers 8A and 8B built into the cable 5 are connected to independent mobile terminal devices 90 and 91 via different optical rotary joints 10A and 10B, respectively. Since the wires are connected to independent fixed-side terminal equipment 60 and 61, and an independent transmission system is constructed between each one of the station equipment, one fixed-side terminal equipment 60 is used as a transmitter, Optical fiber 8A
→First optical rotary joint 10A→Optical fiber 8A' to send necessary signals to the mobile terminal device 90, and at the same time send the other fixed terminal device 61 as a receiving section to another different mobile terminal station. Necessary signals can be received from the device 91 through the optical fiber 8B'-> the second optical rotary joint 10B -> the optical fiber 8B.

In this way, by dividing the two transmission systems into one for transmitting and one for receiving and transmitting and receiving between the mobile machine 50 and the fixed device, the terminal station can be made simpler and more economical.

In the above embodiment, two optical fibers 8A,
Although we have described an example in which the optical fiber 8B is used for transmission and reception, for example, one optical fiber 8A may be used for transmitting control signals, and the end station device 61 of a fixed device connected to the other optical fiber 8B may be used as a monitor for a mobile machine. It is also possible to use the terminal device 91 as a television camera that displays meters and other devices for transmitting image signals to monitor the status of mobile machines.

In addition, in the above embodiment, the cable reel device 1
is mounted on the mobile machine 50, but the device 1 is also installed on the fixed device side, and the unwinding end of the cable 5 wound on the reel 2 is fixed to the mobile machine for use. It is also possible.

Further, in the above embodiment, a communication power composite cable is used as the cable 5, but the present invention is not limited to this, and the present invention is also applicable to a case where a communication-only cable is used.

As explained above, according to the cable reel device of the present invention, two optical rotary joints are specially arranged between the rotating part of the reel and the fixed part facing it, and the reel is wound. By connecting the two optical fibers of the cable separately to each optical rotary joint, an independent signal transmission system is constructed between the mobile end station equipment and the fixed end office equipment. This makes it possible to simultaneously transmit different types of signals such as control signals and video signals, which has great practical benefits.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of a cable reel device according to the present invention. In the symbols, 1 is a cable reel device, 2 is a reel, 3 is a drum-shaped shaft, 4 is a collar, 5 is a cable, 6 is a cylindrical shaft, 8A, 8B, 8A', 8B' are optical fibers, and 10A is a 10B is a second optical rotary joint; 50 is a mobile machine; 51 is a stand; 52 is a housing; 60 and 61 are fixed end devices; 80 is a tubular fixed arm; Reference numeral 91 indicates a mobile terminal station device.

Claims (1)

[Claims] 1. A drum-shaped shaft 3 provided with flanges 4, 4 on the circumference to form a cable winding drum, and a cylindrical shaft 6 extending from one side of the shaft 3 so as to align the rotation axes. The reel 2 has a housing 52 which is rotatably passed through the cylindrical shaft body 6 of the reel and is pivotally supported and fixed to a stand so as to extend and protrude inside. One optical rotary joint 10A is connected and provided between the side wall of the housing 52 and the end of the cylindrical shaft body 6, while one end is fixed to the housing 52, bypassing the flanges 4, 4, and the other end is A tubular fixed arm 80 is provided on the other side of the drum-shaped shaft 3 and spaced apart and opposed to the rotation axis of the shaft.
Another optical rotary joint 10B is connected and arranged between the other end and the side surface of the drum-shaped shaft body 3,
The cable wound on the drum-shaped shaft between the flanges 4, 4 has different terminal devices 6 at each unwinding end.
Two optical fibers 8A connected to 0,61,
8B, one of the optical fibers is 8B.
The winding start end of the optical fiber A is drawn into the drum-shaped shaft 3 and inserted into the rotating side of the one optical rotary joint 10A through the cylindrical shaft body 6, and the winding start end of the other optical fiber 8B is is drawn into the drum-shaped shaft 3 and connected to the rotating side of the other optical rotary joint 10B, and is connected by an optical fiber 8A' whose one end is connected to the fixed side of the one optical rotary joint 10A. An optical fiber 8B' is connected to one end station 90, and one end is connected to the fixed side of the other optical rotary joint 10B, and the optical fiber 8B' is passed through the fixed arm 80 and led out from the fixed end of the arm. A cable reel device characterized in that the cable reel device is connected to another terminal device 91 different from the one terminal device 90.