JPH0574536A - Conducting device to rotary shaft in printing machine - Google Patents

Abstract

PURPOSE:To surely and stably feed electric power regardless of the high-speed rotation of a rotary shaft, provide excellent durability, and facilitate assembly and repair. CONSTITUTION:Many slip rings 5 are formed on the outer periphery, a connection section 8 removable from a rotary shaft 1 is provided, and a rotary tube 4 with a means 7 electrically connecting the slip rings 5 and an electric apparatus is provided. A fixed casing 10 provided around the rotary tube 4 and many brushes 13 arranged in the axial direction of the rotary shaft 1 on the fixed casing 10 side and brought into contact with the slip rings 5 by an electromagnet 12 only at the time of power feeding are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for energizing 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, and thereby register adjustment is performed. In addition, it has become necessary to energize the plate cylinder shaft that continuously rotates at high speed from the fuselage side. The energization here includes both a relatively large drive current for driving the motor and a relatively weak control current for controlling the potentiometer and the like associated with the motor. As an indication of the necessity of such energization, JP-A-3-133
Although there is Japanese Patent No. 643, this publication does not disclose any energizing device for the rotating shaft.

[0003]

Although not directly related to a printing press,
Japanese Patent Application Laid-Open No. 64-672 is a technique which discloses a structure of a slip ring for a video tape recorder. However, the technique described in this publication does not address various problems peculiar to a printing press.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and provides an improved current-carrying device for a rotating shaft. Is performed reliably and stably, has excellent durability, and is capable of easily performing assembly and repair.

[0005]

To this end, in the energizing device for the rotating shaft in the printing machine according to the present invention, a multiplicity of slip rings are formed on the outer periphery, and a connecting portion that is detachable from the rotating shaft is provided. And a rotating cylinder having means for electrically connecting the slip ring and the electric device,
And a brush which is provided around the rotary cylinder and a plurality of which are arranged side by side in the axial direction of the rotary shaft on the fixed casing side and which come into contact with the slip ring only when energized by an electromagnetic magnet. And

[0006]

According to the apparatus of the present invention, the circuit is formed by the electromagnetic magnet only when the electric current is applied, such as the brush-slip ring-electrical connecting means and the electric equipment mounted on the rotary shaft. Therefore, despite the high speed rotation of the rotating shaft, the energization is reliable and stable, and since the brush contacts the slip ring only when energizing, the durability is excellent, and the rotating shaft is a unit. It can be easily attached and detached, and assembly and repair can be done easily.

[0007]

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

In FIG. 1, reference numeral (1) indicates a rotary shaft such as a plate cylinder shaft to be energized. As described above, such a rotating shaft (1) requires a drive current or a control current for electric equipment such as a motor for register adjustment. The electric equipment such as a motor is specifically mounted on a key part of the plate cylinder, so that it is not shown in the drawing, but a cable (2) for energization is shown, and a rotary shaft (1 The connector (3) forming the electrical connection means is also shown at the end of FIG. Needless to say, the rotary shaft (1) is rotatably supported between the side walls of the printing machine, and is continuously rotated at a high speed of 12,000 rpm or more for printing operation.

The rotary shaft (1) which is continuously rotated in this way
Further, it is the device of the present invention that energizes from a stationary outside, and the device of the present invention is detachably coupled to the rotary shaft (1) 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. And
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 is connected to the connector (7) on the rotary cylinder (4) side. Connector (3) on the rotating shaft (1) side described above
By combining and, an electrical connection between the slip ring (5) and the electrical equipment is achieved.

Further, one end of the rotary cylinder (4) is adapted to be fitted on the rotary shaft (1), and is pinned toward an elongated hole (8) provided on the rotary shaft (1). By inserting (9), the rotary cylinder (4) is rotated integrally with the rotary shaft (1). However, it is extremely easy to remove the pin (9) and the rotary cylinder (4) from the rotary shaft (1), and the rotary cylinder (4) is eventually the rotary shaft (1).
The pins (9), the long holes (8) and the like constitute a coupling portion which is detachable.

Reference numeral (10) indicates a stationary casing on the stationary side. The stationary casing (10) surrounds the rotating cylindrical body (4) to be rotated (FIG. 2), and a bearing (11) is interposed therebetween. 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 FIG. 0), a cantilevered brush (13) operated by an electromagnetic magnet (12) is disposed 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 3), and thus the number of threads of the slip ring (5), are determined in response to the required drive current and control current, but are ensured for the rotating shaft (1) that is continuously rotated at high speed. In addition, in order to stably supply various currents, it is preferable to provide a plurality of paths for one control current, for example. Further, it is preferable that the tip of the cantilevered brush (13) is partially plated with a conductive metal having excellent wear resistance.

The electromagnetic magnet (12) releases the cantilevered brush (13) to contact the slip ring (5) by the brush control signal sent through the control lead (14), and at this time, the input lead. The drive current or the like sent through the wire (15) flows from the brush (13) to the slip ring (5).

Next, the operation will be described. Since the rotary shaft (1) needs to be energized only for a short period of the printing operation time, the cantilever beam is not energized. The brush (13) is attracted by the electromagnetic magnet (12) and separated from the slip ring (5).

However, when energization is required, the brush control signal sent through the control lead (14) releases the electromagnetic magnet (12), causing the brush (13) to slip ring as shown in FIG. (5) is contacted. At this time, the electric current sent through the input lead wire (15) passes through the brush (13) -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 (13) and the slip ring (5). Therefore, it is recommended that the cantilevered brush (13) be slapped several times when energized to remove the obstacle caused by dust.

[0018]

According to the apparatus of the present invention, the electric current is reliable and stable, the durability is excellent, and the assembly and repair are easy. Therefore, it is suitable for the electric equipment mounted on the rotary shaft. There is a significant effect that various functions such as adjustment can be exerted to further enhance the printing technology.

[Brief description of drawings]

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 rotary shaft 2 cable 3 connector 4 rotary cylinder 5 slip ring 6 lead wire 7 connector (electrical connection means) 8 slot (coupling part) 9 pin (coupling part) 10 fixed casing 12 electromagnetic magnet 13 brush 14 control lead wire 15 Input lead wire

Claims (1)

[Claims] 1. A rotary shaft energizing device in a printing press for supplying a required electric current to a rotary shaft, which is mounted with an electric device and is rotated at a high speed, comprising a multi-slip ring (5).
Is formed on the outer periphery, and a coupling part (8) that can be attached to and detached from the rotary shaft (1) is provided, and means (7) for electrically connecting the slip ring (5) and the electric device. A rotary cylinder (4), a fixed casing (10) surrounding the rotary cylinder (4), and a large number of the fixed casing (10) on the fixed casing (10) side in the axial direction of the rotary shaft (1). Brushes (1) arranged side by side and contacting the slip ring (5) only when energized by the electromagnetic magnet (12)
3) and having.