JPH01284874A - Wire cleaning device for corona discharge device - Google Patents

Abstract

PURPOSE:To confirm a fact that a reciprocating moving body has returned to a home position by giving a command for moving the reciprocating moving body to a home position of a transfer rod at the time of ON of a supply power source of a copying machine and displaying its result. CONSTITUTION:When a start switch S1 is set to ON, a driving motor M turns forward through a moving body driving controller 9, a moving rod 1 rotates, and a reciprocating body 2 moves in the direction as indicated with an arrow (a). As a result, a side part of a pad supporting body 7 is separated from a magnet separating member 6 (a side part of a wire supporting body 11), a magnet 4 is sucked by a magnet catch 5 and a pad oscillating lever 3 oscillates counterclockwise centering around a stepped screw 14. Subsequently, the supporting body 7 oscillates and a pair of cleaning pads 8 are pressed against a wire 10 by magnetic force of the magnet 4, and by a movement of the moving body 2, the wire 10 is cleaned. When the moving body 2 approaches a home position, the pad 8 is separated from the wire 10. When the moving body 2 returns to the home position and a switch S3 becomes ON, the rotation of the motor M stops.

Description

TECHNICAL FIELD The present invention relates to a wire cleaning device for a corona discharger in a copying machine.

(Prior Art) Conventionally, with a cleaning pad in pressure contact with the wire of a corona discharger, a reciprocating body supporting the cleaning pad is reciprocated along a transfer rod disposed approximately parallel to the wire. Wire cleaning devices configured to clean wires are known.

By the way, the reciprocating body in this wire cleaning device is
When the wire cleaning device is not functioning, it is normally set to stand by at a position outside the image area of the copying machine, that is, at the home position of the transfer rod.

However, for example, the power of the copying machine may be turned off during the operation of the wire cleaning device, the reciprocating member may be moved to an intermediate position of the transfer rod due to manual operation during maintenance, or the reciprocating member may be overloaded due to a sheet jam or the like. If the reciprocating body is stopped at an intermediate position for some reason, such as when the movement of the reciprocating body is blocked at an intermediate position, and a copy is executed using a copying machine, the above-mentioned conventional wire cleaning device may cause missing images in the copy. There were drawbacks such as problems.

(Objective) An object of the present invention is to provide a wire cleaning device for a corona discharger that can keep the reciprocating body always on standby at its home position when starting up a copying machine.

Another object of the present invention is to provide a wire cleaning device for a corona discharger that can display whether the reciprocating body has been returned to its home position within a predetermined time.

(Structure) In order to achieve the above-mentioned object, the corona discharger wire cleaning device according to the present invention has the following features:
A command for moving the reciprocating body to a home position of the transfer rod is given to a driving means of the reciprocating body.

Further, the wire cleaning device for a corona discharger according to the present invention includes:
In order to achieve the purpose of the pond, a detecting means determines whether the reciprocating body has moved reciprocally within a predetermined time after being fixed to the transfer rod, and based on the determination result of the detecting means, the reciprocating body The display means displays whether or not the moving body has returned to its home position within the predetermined time.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

The wire '1fJH device of the corona discharger in which the present invention is implemented includes, for example, as shown in FIGS. 1 to 7, a transfer rod 1, a reciprocating body 2, a pad swinging rod 3, a magnet 4. Magnetic catch 5, magnet/separation member 6. It is composed of a pad support 7, a cleaning pad 8, a movable body driving means, and the like.

Note that, as is well known, the corona discharger includes a wire 10,
It is comprised of a wire support 11 for supporting both ends of the wire 10 and stretching the wire 10, and a shield case I2 for supporting the wire support 11 and shielding the wire 10.

The transfer rod 1 is rotatably supported by a pair of brackets 13 on the back side of the corona discharger, that is, on the back side of the shield case 12, along the direction in which the wire 1o is stretched (see FIG. 7). A feed screw 1a is formed on this transfer rod 1.

The reciprocating body 2 is fitted onto the transfer rod 1.

A female thread is formed in the fitting portion to be screwed into the feed screw of the transfer rod 1.

The pad swinging rod 3 has a stepped screw 14 as shown in FIG.
It is pivotally supported to the reciprocating body 2 so as to be swingable. Here, the stepped screw 14 is hinged in a direction perpendicular to the back surface of the shield case 12, so that the pad swinging rod 3 is configured to swing along the back surface of the shield case 12. ing.

The magnet 4 is fixed to the center of swing of the pad swing rod 3, that is, at a location off the axis of the stepped screw 14.

At least the part of the magnetic catch 5 that faces the magnet 4 is made of a magnetic material (such as a piece of iron) that is attracted to the magnet 4 by its magnetic force.
Its base is fixed to the reciprocating body 2. Further, as shown in FIGS. 2 and 3, this magnetic catch 5 is separated from the magnet 4 when the reciprocating body 2 is located at its home position (the position shown in FIG. 2). , and the position where the magnetic force of the magnet 4 is applied, that is, when the reciprocating body 2 starts moving from its home position as shown in FIG. 3, the magnetic catch 5 is attracted by the magnetic force of the magnet 4. The extending portion made of a magnetic material is formed so as to face the position where the pad swinging rod 3 is swung around the stepped screw 14. Furthermore, as shown in FIG. 3, when the magnet 4 is attracted to the magnetic catch 5 by its magnetic force, the magnet 4 is set so that the magnet 4 and the magnetic catch 5 are completely attracted to each other. Alternatively, the opposing surfaces of the magnetic catch 5 may be formed in advance so as to be in close contact with each other, or the wire 10 and the cleaning pad 8 may be separated due to an error in parallelism between the wire 10 and the transfer rod 1 (described later), when the reciprocating body 2 is separated from its home position, the magnet 4
The magnetic catch 5 may be formed so as to be slightly separated from the magnetic catch 5.

The magnet separating member 6 is disposed at a position where it comes into contact with a portion that restrains the swinging of the pad swinging rod 3 due to the magnetic force of the magnet 4 in the home position. That is, in the illustrated embodiment, the wire support 11 on the home position side also serves as this magnet separation member 6, and this magnet separation member 6, for example,
As shown in the figure, in the home position, the side part (the fourth
As shown in FIG. 2, the magnet 4, which is integrated with the pad swinging rod 3, is separated from the magnet catch 5 by making contact with the pad (left side in the figure).

The swinging of the pad swinging rod 3 due to the magnetic force of the magnet 4 is restrained.

As shown in FIG. 6, the pad support 7 is mounted on a pad swinging rod 3 so as to face a position along the inner surface of the shield case 12.
It is composed of an integrated system. That is, the illustrated pad support 7 extends from both ends of the pad swinging rod 3 to the inner surface of the shield case 12 through an elongated hole 12a (see FIG. 1) bored in the back of the shield case 12 along the transfer rod 1. It is integrated with the pad swinging rod 3 via a stay 15 hanging down from the side. Here, the elongated hole 12a and the stay 15 are
The pad swinging rods 3 are formed so as not to interfere with each other when swinging. Note that this pad support 7 may be formed so as to bypass both sides of the shield case 12 and be integrated with the pad swinging rod 3.

The cleaning pads 8 are composed of pairs, and as shown in FIGS. 4 to 6, the cleaning pads 8 are located at a position facing the wire 1o of the pad support 7 with the wire 1° therebetween, that is, as shown in FIGS.
A pair of tongues 7a are formed hanging from the pad support 7 on both sides of the wire 1o, and are attached to the surfaces facing the wire 10, respectively.

The cleaning pad 8 is made of, for example, felt or urethane foam.

The movable body driving means is a means for reciprocating the reciprocating movable body 2 along the wire tensioning direction, and for example, the end of the transfer rod 1 is formed into a crank shape, and this crank portion It may also be configured to rotate by.

The movable body driving means in the illustrated embodiment is, for example, the seventh
As shown in the figure, a drive motor M is directly connected to the end of the transfer rod L (or may be connected via a reduction gear), and a start switch S1. It is comprised of a reversing switch SZ that reverses the rotational direction of the drive motor M, a home position switch 83 that stops the rotation of the drive motor 1 when the reciprocating body 2 returns to its home position, and the like.

The start switch S1 is output when the number of copies reaches a preset value in conjunction with, for example, a signal from an operation button on the operation panel (not shown) of a copying machine or a copy counter. is turned on by

For example, as shown in FIG. 7, the reversing switch S2 is disposed on the wire support 11 facing the home position of the corona discharger, and is a part of the reciprocating body 2.
For example, it is turned on and off using the magnetic catch 5 as an actuator.

The home position switch S3 is, for example, disposed on the wire support 11 next to the home position,
Like the reversing switch S2, it is turned on and off using a part of the reciprocating body 2 as an actuator.

The outputs of these switches S l r SZ + SEI are respectively input to a mobile object drive control device 9 (for example, a microcomputer built into a copying machine)'', which controls the drive motor M as described below. Note that such control of the drive motor M is performed, for example.

Since this method is widely used in controlling optical system drive motors of copying machines, only its operation will be explained here.

First, when the start switch S is turned on, the drive motor M is rotated in the forward direction via the moving body drive control device 9. Note that the normal rotation direction of the drive motor M is determined by the direction of the feed screw of the transfer rod 1, and here, the direction in which the reciprocating body 2 moves away from its home position is defined as the normal rotation direction of the drive motor M.

As the drive motor M rotates forward, the transfer rod 1 rotates in a predetermined direction, and the rotation of the transfer rod 1 causes the reciprocating body 2 to
In FIG. 7, it is moved in the direction of arrow a. Due to this movement of the reciprocating body 2, the side part of the pad support body 7 is separated from the magnet separation member 6 (the side part of the wire support body 11),
The magnet 4 is attracted to the magnet catch 5, and the pad swinging rod 3 swings counterclockwise in FIG. 2 about the stepped screw 14 (see FIG. 3). As the pad swinging rod 3 swings, the pad support 7 swings in the same direction, and the pair of cleaning pads 8 are pressed against the wire 10 by the magnetic force of the magnet 4 (see FIG. 5).

By moving the reciprocating body 2 in the above-mentioned state, that is, with the cleaning pad 8 in pressure contact with the wire 10, the cleaning pad 8 removes toner and paper powder adhering to the wire 10.

Next, when the reciprocating body 2 reaches the end of its reciprocation (the right end in FIG. 7), the reversing switch sZ is turned on and the rotation direction of the drive motor M is reversed. As a result, the transfer rod 1 reverses, and the reciprocating body 2 moves back in the direction indicated by the arrow in FIG. The cleaning pad 8 also comes into pressure contact with the wire 10 during the backward movement of the reciprocating body 2 to clean any deposits on the wire 10.

Next, when the reciprocating body 2 approaches its home position, first, one side of the pad support 7 comes into contact with the member 6 by a magnet, and the pad swinging rod 3 moves around the stepped screw 14 at the fifth position. The state shown in the figure swings to the state shown in FIG. 4, and the cleaning pad 8 that has been in pressure contact with the wire 10 is separated from the wire 10, and the magnet 4 is separated to a position separated from the magnetic catch 5. .

Then, when the reciprocating body 2 returns to its home position and the home position switch S3 is turned on,
The rotation of the drive motor ~1 is stopped, and the reciprocating body 2 is kept on standby at the home position until a signal to start the next cleaning is output (on signal of the start switch S+).

In addition, as shown in FIG. 8, for example, the above-mentioned moving body driving means includes a driving pulley P mounted on the output shaft of the driving motor M, and a driving pulley P1 that sandwiches the shield case 12.
A drive wire W (a chain or a belt may be used) is passed between the driven pulley P2 disposed at the opposite location, and a part of the reciprocating body 2 is fixed to the drive wire W. A means for rotating the drive motor M in the same manner as described above may also be used.

By the way, in the corona discharger wire cleaning device configured as described above, when the power supply to the copying machine is turned off during cleaning of the wire 10, the reciprocating body 2 is stopped at an intermediate position of the corona discharger. Ru. In this case, in the conventional wire cleaning device, even if the power supply to the copying machine is turned on again, the reciprocating body 2 does not operate and the first period start signal (
Unless there is an output from the start switch S1 or an output from the microcomputer, the reciprocating body 2 remains stopped at the intermediate position. Here, the reason why the start signal is not output when the power supply to the copying machine is turned on again is mainly to maintain the quality of the copied image. That is, when a start signal is output every time the copying machine is powered on, the reciprocating body 2 is driven back and forth each time, and the wire 10
There is a risk that the wire 10 may be damaged due to excessive cleaning, which will have an adverse effect on the copied image.

Moreover, when the reciprocating body 2 is operated for every copy and every operation,
It becomes necessary to wait the copying operation for the time required for cleaning the wire, which increases the loss of copying time. For this reason, normal copying machines are controlled so that the wire cleaning device does not operate when the fusing temperature is above a certain temperature or when a predetermined number of copies or more have not been made. When the reciprocating body 2 stops at an intermediate position as in the example shown in FIG.

Therefore, for example, in the moving body drive control device shown in FIG.
The output signal of the main switch SM of the copying machine, that is, the ON signal of the power supply of the copying machine is applied to the copying machine, and the wire cleaning device is configured to be driven according to the program shown in FIG. 9 based on this ON signal. This program is stored in the ROM of the mobile body drive control device 9 in advance. Here, if the transfer PII body drive control device 9 is a microcomputer in the main body of the copying machine, the above-mentioned ROM may be connected to the CPU of this microcomputer.

Further, a display means for displaying an abnormality in the operation of the reciprocating body 2 is connected to the output terminal of the movable body drive control device 9. This display means consists of a lamp, an LED, or a display for notifying an abnormality such as an alarm, and is arranged on the operation panel of the copying machine.

The program shown in FIG.
This is a subroutine that is executed when M is turned on.
The operation routine (main routine) of the wire cleaning device described above is called by inputting an ON signal of the main switch SM to the movable body drive control device 9.

When this subroutine is called, first, the drive motor M is reversed. As a result, the reciprocating body 2 is returned to the home position of the transfer rod 1, that is, to the left end in FIG. As a result, even if the reciprocating body 2 is stopped at an intermediate position of the transfer rod 1 when the copying machine is started, the reciprocating body 2
The return to the home position is executed, and the reciprocating body 2
is saved outside the image area of the copying machine. Therefore, in this wire cleaning device, the reciprocating body 2 does not interfere with the copying operation, and image omissions in copies are prevented. On the other hand, when the drive motor M is reversed, the timer circuit T is first started.

This timer circuit T is built in the moving body drive control device 9. Next, it is determined whether the elapsed time t from the start of the timer circuit T has exceeded the set time to. Here, the set time 0 is preset to a time (usually 20 to 30 seconds) obtained by adding a slight loss time to the time for the normal return movement of the reciprocating body 2. In this determination, if 1<to, the next step is executed, and it is determined whether the home position switch S5 is turned on. Here, when it is determined that the home position switch S9 is on, that is, the reciprocating body 2 has returned to the home position, the drive motor M is turned off and the timer circuit T is reset, and then the process returns to the main routine.

On the other hand, in the above step, if it is determined that the home position switches S are in the OFF state, that is, the reciprocating body 2 has not been returned to the home position yet, then the previous determination, that is, the elapsed time t is set to 0 This is fed back to the step of determining whether or not the above has been reached. Here, if t≧0, that is, the home position switch S3 is not turned on, and the set time to
If , the display means is turned on to notify that the reciprocating body 2 has stopped or jammed at the intermediate position of the transfer rod 1 for some reason. At this point, the program may be programmed to turn on the display means and also cancel the function of the copy start switch (turn on the red lamp built into the copy start switch) to prevent the occurrence of copy mistakes.

Further, it is desirable to program the drive motor M to be turned off at this point to prevent damage to the drive motor M.

(effect) A corona discharger wire cleaning device according to the present invention.

It is possible to return the reciprocating body to the home position before copying, thereby preventing missing images in copies, and to detect abnormal operation of the reciprocating body, thereby preventing damage caused by overloading the drive motor, etc. can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of essential parts of an embodiment of the present invention, Fig. 2 is a partial plan view of the back side of the above embodiment, Fig. 3 is a view of the operation mode of the back side of the above embodiment, and Fig. 4 is the above embodiment. FIG. 5 is a partial plan view of the inner surface of the embodiment, and FIG.
The figure is a sectional view taken along the line X-X in FIG. 2, FIG. 7 is an explanatory diagram of the operation of the above embodiment, FIG. 8 is a schematic diagram of another embodiment of the present invention, and FIG. 9 is a diagram showing the operation of the above embodiment. It is a flowchart. 1... Transfer rod, 2... Reciprocating body, 3...
Pad swinging rod, 4... Magnet, 5... Magnet catch, 6... Magnet front member, 7...
...Pad support, 8...Cleaning pad,
9... Mobile body drive control device, 10... Wire,
11...Wire support body, 12...Shield case, M...Movement motor, 5l11...Main switch, S3...Home position switch, T...
...Timer circuit, L...Display means. %5 figure

Claims (1)

[Claims] 1. With the cleaning pad in pressure contact with the wire of the corona discharger, the wire In a copying machine having a wire cleaning device for cleaning, when the power supply to the copying machine is turned on, a command to move the reciprocating body to a home position of the transfer rod is given to a driving means of the reciprocating body. A corona discharger wire cleaning device featuring: 2. Return movement time detection means for determining whether the reciprocating body has moved back and forth along the transfer rod within a predetermined time;
2. The wire cleaning device for a corona discharger according to claim 1, further comprising a display means that is turned on when the detection time of the detection means has exceeded the predetermined time.