JPS59188245A - Signal transmitter of rotating body - Google Patents

Abstract

PURPOSE:To transmit a noncontact signal to both members which are in relative rotation relation by providing the transmission part of an optical signal transmitter to one of members whose axial centers of rotation are aligned to each other, and the reception part to the other. CONSTITUTION:An electric signal inputted from a lead wire 6b to an optical signal receiver and transmitter 3b is converted by an incorporated signal conversion part into light, which is emitted from the optical signal receiver and transmitter 3b to an optical receiver and transmitter 3a through hollow parts of brackets 1 and 2. The optical signal receiver and transmitter 3a receives the light to convert the light into an electric signal by its incorporated part, and transmits the signal to a target part through a lead wire 6a. Even when rotation is caused between the brackets 1 and 2, there is no influence because receiving and transmitting lens parts 3c and 3d of the optical signal receiver and transmitters 3a and 3b are on their center axes of rotation.

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to a signal transmission device for a rotating body.

[Background of the invention]

BACKGROUND ART In machines having a rotating body and a stationary body, when it is necessary to transfer electrical signals between the rotating body and the stationary body, a slip ring system, a torsion cable system, etc. are conventionally used.

With the increasing sophistication and complexity of control systems, for example in cranes, there is a tendency for the number of signal points to be passed between a rolling body and a traveling body that are in a relative rotational relationship to increase.

With conventional slip ring and torsion cable methods,
An increase in the number of signal points leads to an increase in the number of slip ring stages and an increase in the number of cables, creating problems in terms of installation space. In addition, there is a trend toward increasing the sophistication of control systems and increasing the use of computers and other light electrical equipment. In this case, maintenance and noise countermeasures are difficult in a device that transmits electrical signals by contact sliding, such as signal transmission using a conventional slip ring.

Generally, a signal transmission method using light is considered as a non-contact signal transmission method that is not affected by noise. For example, it is disclosed in Tokukan Sho 53-64351. However, members in a relative 62 rotation relationship (S device)
There is no indication of contactless signal transfer between the two.

[Purpose of the invention]

An object of the present invention is to provide a compact and highly reliable signal transmission device between members in a relative rotational relationship.

[Summary of the invention]

The present invention provides optical signal transmission to one of the members in a relative rotational relationship with the same rotation axis! The illuminating device is characterized in that a transmitting portion of ill is provided on the other side, and a receiving portion is provided on the other side, aligned with the rotation axis.

[Embodiments of the invention]

The present invention will be explained below based on an embodiment of the present invention shown in FIG. In Fig. 1, 1 is a hollow rotating body side bracket, 2 is a hollow fixed body side bracket, 3a and 3b.
are respectively optical signal reception and transmission 1i! It is B. 3C and 3
d is a receiving/transmitting lens portion of each optical signal receiving/transmitting device. 4 is a bearing, and 5 is a slip ring shaft for the center post of the crane. 6a and 6b are lead wires for transmitting electrical signals, and 7 is a cover.

The device of this embodiment, which is incorporated into the upper part of the slip ring shaft 5 for the center post of a crane, has the following configuration. That is, a hollow fixed body #1 bracket 2 is attached on the slip ring shaft 5. Inside the second bracket 2 is a hollow rotating body side bracket 1 with a bearing 4.
The rotatable guard is attached to the bracket 2 via.

For this purpose, each bracket 1.2 is a member in relative rotation about a common central axis.

An optical signal receiver M device W, 3a is fixed downwardly to the upper end surface of the bracket 1 so that the receiving/transmitting lens portion 3C is aligned with the center of rotation of the bracket 1.2. On the other hand, bracket 2
The other optical signal receiving and transmitting device 3b housed in the hollow is mounted on the bracket 2 with its receiving and transmitting lens portion 3d facing upward and aligned with the center of rotation of the bracket 1.2.
Fixed to.

The optical signal receiving/transmitting bags 5i and 3a are covered by a cover 7 fixed to the upper end of the bracket 1. A lead wire 6a for transmitting electrical signals from an external control circuit is connected to the optical signal receiving/transmitting bag @3a, and a lead wire for transmitting electrical signals from the external control circuit is connected to the other optical signal receiving bag @3b. 6b continues.

In this embodiment, the electrical signal input from the lead wire 6b to the optical signal receiver/transmitter m'3b is converted into light by the built-in signal converter, and this light is transmitted from the optical signal receiver/transmitter ab to the optical signal receiver/transmitter m'3b. Each bracket 1 to the signal receiving and transmitting device 3a
．． It is emitted through the hollow part of 2. The optical signal receiving and transmitting device 13a that receives this light converts the light into an electrical signal using a built-in conversion section, and transmits the signal to the target part through the lead wire 6a.

Even if rotation occurs between the bracket 1 and the bracket 2 in the case of 2, the receiving/transmitting lens portions 3c, 3d of each optical signal receiving/transmitting device 3a, 3b are on the rotation center axis) is not affected in any way. In the above example, the explanation was given of transmission from the bracket 2 side to the bracket 1 side, but transmission in the opposite direction is also possible.

According to this embodiment, the signal transmission device for the rotating body is −′
Since it can be constructed without using slip rings or torsion cables, the shape and dimensions are small and consideration for noise can be relaxed, and furthermore, since it can transmit without contact, it can be used as a signal transmission device for rotating bodies that can extend its life. Effects can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to realize a small and highly reliable signal transmission device between members having a relative rotational relationship.

[Brief explanation of the drawing]

FIG. 1 is a drawing showing an embodiment of the present invention. 1... Swivel body side bracket, 2... Fixed body side bracket, 3a, 3b... Optical signal receiving and transmitting device, 3c, 3d... Receiving and transmitting lens section , 4
······bearing.

Claims (1)

[Claims] 1. A rotation system in which a transmitting section of an optical signal transmission device is provided on one member and a receiving section of an optical signal transmission device is provided on the other member in a relative rotational relationship with the rotational axes aligned with each other, each aligned with the rotational axis. The body's signal transmitter.