JPH06104061A - Transmission device to rotating shaft in printing machine - Google Patents

Abstract

PURPOSE:To surely and stably perform transmission in spite of the high speed operation of a rotating shaft, and enhance resistance to friction and reliability to control by providing a brush and projector, and a light receiver on a fixed casing side, in conformation to a slip ring and light receiver, and a projector on a rotating cylinder side, respectively. CONSTITUTION:At non-transmission, a cantilever brush 15 is attracted by an electromagnet 14 and separated from a slip ring 5. When transmission is required, the brush 15 is released from the electromagnet 14 according to a brush control signal transmitted through a control lead, and makes contact with the slip ring 5. The current carried through an input lead is carried to an electric apparatus put on a rotating shaft 1 in the route of the brush 15 - the slip ring 5 - a lead 6 - connectors 7, 3 - a cable 2. The transmission of the control signal from a fixed casing 12 side to a rotating cylinder 4 is conducted by a projector 18 - a light receiver 8, and the reverse transmission by a projector 9 - a light receiver 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission device for a rotary shaft such as a plate cylinder shaft in a printing machine.

[0002]

BACKGROUND OF THE INVENTION For example, a printing plate wound around a plate cylinder of a sheet-fed printing press is position-corrected by an electric drive means such as a motor incorporated in the plate cylinder, thereby performing register adjustment. In addition, it became necessary to transmit current and signals from the fuselage side to the plate cylinder shaft that continuously rotates at high speed. The transmission here includes both a relatively large drive current for driving the motor and a relatively weak control signal for controlling a potentiometer and the like associated with the motor. As an indication of the necessity of such communication, Japanese Patent Laid-Open No. Hei 3
Although there is Japanese Patent No. 133643, this publication does not disclose any transmission device to the rotating shaft.

[0003]

2. Description of the Related Art U.S. Pat. No. 3,663,770 is a technique which discloses the structure of a general electric rotary joint, although it is not directly related to a printing machine. However, the technique described in this publication does not deal with various problems unique to a printing press, and requires a complicated mechanical structure.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides an improved transmission device for a rotating shaft, the object of which is to transmit the rotating shaft in spite of high speed rotation. Is performed reliably and stably, has excellent durability against abrasion, and is capable of highly reliable control.

[0005]

To this end, the transmission device to the rotary shaft in the printing machine according to the present invention is provided with the rotary shaft (1).
Side rotating cylinder (4) and a fixed casing (12) provided around this rotating cylinder (4), and on the rotating cylinder (4) side, a large number of slip rings (5) are provided on the outer circumference. Is formed, a light receiver (8) and a light projector (9) are provided at one end, and a detachable coupling portion with the rotating shaft (1) is provided, and a slip ring (5),
Means are provided for electrically connecting the receiver (8) and the projector (9) to electrical equipment, while a fixed casing (12).
On the side, a large number of brushes are juxtaposed in the axial direction of the rotating shaft (1), and the brush (15) that comes into contact with the slip ring (5) only when energized by the electromagnetic magnet (14), the light receiver (8) and the light projector ( 9) is provided with a light projector (18) and a light receiver (19).

[0006]

According to the device of the present invention, the brush (15) -slip ring (5) -electrical connecting means and the electric device mounted on the rotating shaft (1) by the electromagnetic magnet (14) only when energized. The circuit is formed as described above. Therefore, despite the high speed rotation of the rotary shaft (1), energization is reliable and stable, and since the brush (15) contacts the slip ring (5) only when energized, it is durable against wear. Is excellent. On the other hand, since the control signal is transmitted by photoelectric conversion by the light projecting-light receiving unit, despite the high speed rotation of the rotary shaft (1),
Reliable transmission is achieved.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a sectional explanatory view showing an embodiment of a transmission device to a rotary shaft in a printing machine according to the present invention, and FIG. 2 is a sectional view taken along the line II-II of FIG.

In FIG. 1, reference numeral (1) indicates a rotary shaft such as a plate cylinder shaft to be transmitted. As described above, the rotary shaft (1) is provided with an electric device such as a motor and a potentiometer for register adjustment.
Drive currents or control signals are required. Since electric devices such as motors are specifically mounted on the key points of the plate cylinder,
Although not shown, a cable (2) for conducting electricity
Is also shown, and at the end of the rotary shaft (1) is also shown a connector (3) which constitutes an electrical connection means.
Needless to say, the rotary shaft (1) is rotatably supported between the side walls of the printing machine, and the rotary shaft (1) is rotated at 1 hour / hour for printing operation.
It is continuously rotated at a high speed of 2,000 rpm or more.

A rotary shaft (1) which is continuously rotated in this way
In addition, the device of the present invention serves as a device for transmitting a current and a signal from a stationary outside, and the device of the present invention is detachably coupled to the rotary shaft (11) as a unit described in detail below.

Reference numeral (4) indicates a rotary cylinder, and this rotary cylinder (4) is a cylindrical member which is rotated integrally with the rotary shaft (1). A large number of slip rings (5) made of a conductive metal (for example, gold plating) are formed on the outer periphery of the rotary cylinder (4) at a constant pitch via an insulator. Each of the slip rings (5) is connected to the connector (7) by a large number of lead wires (6) forming an electrical connection means, and the connector (7) on the rotary cylinder (4) side. ) And the above-mentioned rotary shaft (1) with the connector (3) of the shaft, the electrical connection between the slip ring (5) and the electric device is achieved.

Further, at one end of the rotary cylinder (4), a photo
As shown in FIG. 3, the light receiver (8) and the light projector (9), which are composed of photoelectric conversion elements such as transistors, are arranged in a satellite manner with the light receiver as the center. These light projector (8) and light receiver (9) are for exchanging control signals for electric equipment with the outside as will be described later, and, of course, electrically with the connector (7). It is connected.

Further, one end of the rotary cylinder (4) is adapted to be fitted on the rotary shaft (1), and the pin is directed toward an elongated hole (10) provided on the rotary shaft (1). (11)
By inserting the rotary cylinder (4) into the rotary shaft (1)
Is rotated together with. However, it is extremely easy to remove the pin (11) and the rotary cylinder (4) from the rotary shaft (1), and after all, the rotary cylinder (4) is detachable from the rotary shaft (1), These pins (11), elongated holes (10), etc. constitute a detachable coupling part.

Reference numeral (12) indicates a stationary casing on the stationary side, and this stationary casing (12) surrounds the rotating cylindrical body (4) to be rotated (FIG. 2) and via a bearing (13). It faces the rotary cylinder (4).

In FIG. 2, a fixed casing (1) having a hexagonal shape and surrounding the rotary cylinder (4) is formed.
In 2), a cantilever-shaped brush (15) operated by an electromagnetic magnet (14) is arranged so as to be able to come into contact with and separate from a slip ring (5) of a rotary cylinder (4). Brush (1
The number and arrangement of 5), and thus the number of threads of the slip ring (5), are determined in response to the required drive current, but reliably on the rotating shaft (1) that is continuously rotated at high speed, and In order to stably supply various currents, it is preferable to provide a plurality of paths for one current, for example. Further, the tip of the cantilevered brush (15) may be partially plated with a conductive metal having excellent wear resistance.

The electromagnetic magnet (14) releases the cantilevered brush (15) by the brush control signal sent through the control lead wire (16) to bring it into contact with the slip ring (5). A drive current or the like sent through the lead wire (17) flows from the brush (15) to the slip ring (5).

Also, at the end of the fixed casing (12), the light receiver (19) is centered on the light emitter (18) as shown in FIG. 4, corresponding to the light receiver (8) and the light emitter (9). ) Are arranged in a satellite manner. These floodlights (1
8) and the light receiver (19) are also made up of photoelectric conversion elements such as phototransistors, and together with the light receiver (8) and the light projector (9) on the side of the rotary cylinder (4) constitute a signal transmission unit by photoelectric conversion. ing. The number of satellite-shaped light projectors (9) on the rotary cylinder (4) side shown in FIG. 3 is larger than the number of light receivers (19) on the fixed casing (12) side. The reason for this is to suppress the attenuation at the time of signal transmission from the side of the projector (9) rotated at a high speed as much as possible. By the way, regarding the signal transmission from the projector (18) on the side of the fixed casing (12) located at the center to the light receiver (8) of the rotating cylinder (4), it is not necessary to consider the influence of high-speed rotation.

Next, the operation will be described. Since the transmission to the rotary shaft (4) is required only for a short time of the printing operation time, the cantilever shape is used when the transmission is not performed. The brush (15) is attracted by the electromagnetic magnet (14) and separated from the slip ring (5).

However, when transmission is required, the brush control signal sent through the control lead (16) releases it from the electromagnetic magnet (14) causing the brush (15) to slip ring as shown in FIG. (5) is contacted. At this time, the electric current sent through the input lead wire (17) passes through the brush (15) -slip ring (5) -lead wire (6) -connector (7), (3) -cable (2) along the rotating shaft ( The electric equipment mounted in 1) is energized.

In the printing environment, paper dust and various powders are scattered, and abrasion powder of the slip ring (5) is also present, and these dusts adhere to the brush (15) and the slip ring (5). Therefore, it is recommended that the cantilevered brush (15) be slapped several times when energized to remove the obstacle due to dust.

On the other hand, the control signal is transmitted by photoelectric conversion by the above-mentioned light projecting-light receiving unit. That is,
The transmission of the signal from the fixed casing (12) side to the rotary cylinder (4) side is fixed by the centrally located projector (18) -light receiver (8), and conversely fixed from the rotary cylinder (4) side. The transmission of the signal to the casing (12) side is performed by the projector (9) -light receiver (19) arranged in a satellite shape.
At this time, since the number of light projectors (9) on the side of the rotary cylinder (4) is made larger than the number of light receivers (19) on the side of the fixed casing (12), the rotation phase of the rotary cylinder (4) is changed. Despite the changes, the attenuation of the signal to be transmitted can be kept low. In addition, since it uses photoelectric conversion, noise is extremely small, and bidirectional data transfer is favorably performed. Therefore, highly reliable control of the mounted electrical equipment becomes possible.

[0021]

According to the device of the present invention, the transmission is reliable and stable, and the durability against wear is excellent.
Moreover, since it is possible to perform highly reliable control, there is a significant effect that the electrical equipment mounted on the rotary shaft can exhibit various functions such as register adjustment and further advance printing technology. .

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view showing an embodiment of a transmission device to a rotary shaft in a printing machine according to the present invention.

FIG. 2 is a sectional view taken along the line II-II of FIG.

FIG. 3 is a diagram showing an arrangement of a light projector and the like on a rotary cylinder side.

FIG. 4 is a diagram showing an arrangement of light receivers and the like on a fixed casing side.

[Explanation of symbols]

 1 Rotating Shaft 2 Cable 3 Connector 4 Rotating Cylindrical Body 5 Slip Ring 6 Lead Wire 7 Connector 8 Light Receiver 9 Emitter 10 Slotted Hole 11 Pin 12 Fixed Casing 13 Bearing 14 Electromagnetic Magnet 15 Brush 16 Control Lead 17 Input Lead Wire 18 Emitter 19 Light Receiving vessel

Claims (1)

[Claims] 1. A transmission device for a rotary shaft of a printing press, which transmits required current and signals to a rotary shaft, which is mounted with an electric device and is rotated at a high speed, wherein the rotary shaft (1) is rotated. It is composed of a tubular body (4) and a fixed casing (12) provided so as to surround the rotary tubular body (4). On the rotary tubular body (4) side, a large number of slip rings (5) are formed on the outer circumference. In addition, a light receiver (8) and a light projector (9) are provided at one end, and a detachable coupling part with the rotating shaft (4) is provided, and the slip ring (5) and the light receiver (8) are provided. ) And a means for electrically connecting the projector (9) and the electric device are provided, while on the fixed casing (12) side, a large number are arranged side by side in the axial direction of the rotating shaft (4), and an electromagnetic magnet ( 14) With the slip ring (5) only when energized Contact brushes (15)
And a light projector (18) and a light receiver (19) corresponding to the light receiver (8) and the light projector (9), respectively.