JPH05307312A - High-voltage power source connection mechanism for image forming device - Google Patents

Abstract

PURPOSE:To surely bring a terminal member on a high-voltage power source side into contact with a terminal member on an electrifier side so that imperfect contact hardly occurs even with time. CONSTITUTION:The terminal member 27 fixed to an end block 26 is made of an elastic body. By forming plural slit-like notches 21 at the tip part of the elastic body which is brought into contact with the terminal member 23 on the high-voltage power source side, plural contacts 31 which can be independently displaced are formed. Even in the case that the imperfect contact occurs in one part of the contact 31 when the terminal members 23 and 27 are brought into contact with each other, they are surely brought into contact with each other by other contacts 31 so as to maintain the sure contact state. The terminal member 23 made of the elastic body may be formed with the plural notches 21 in the side of the terminal member 23, or both of the members may be made of the elastic body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high voltage power supply connecting mechanism for connecting a high voltage power supply to a charging device of an image forming apparatus such as a copying machine or a printer.

[0002]

2. Description of the Related Art A conventional high-voltage power supply connecting mechanism for connecting a high-voltage power supply to a charging device of an image forming apparatus such as a copying machine is shown in, for example, FIG. 6 of JP-A-63-298363. As described above, the terminal member 3 fixed to the high-voltage power supply-side receptacle 2 is fixed to the end block 6 by being connected to one end of the corona wire 8 of the charging device 5 by the conductive connecting member 4. 7
There is one in which a compression coil spring 9 wound in a cylindrical shape is surely brought into contact with the compression coil spring 9 so that the high voltage from the high-voltage power supply 1 can be reliably supplied to the corona wire 8.

Further, as shown in FIG. 7, when the charging device 5 is inserted into the main body of the device in the direction of arrow A, the input terminal 11 of the charging device 5 slides on the high-voltage power supply side receptacle 12 in the direction of arrow B. High voltage power source side terminal member 13 movably provided
The high voltage power source side terminal member 13 contacts the output terminal 14 of the high voltage power source 1 so that the input terminal 11 and the output terminal 14 are connected to each other, whereby the high voltage from the high voltage power source 1 is corona. There is also one that is supplied to the wire 8.

Further, as described in JP-A-62-94864, a high voltage power source side terminal member fixed to a high voltage power source side receptacle is connected to one end of a corona wire of a charging device and an end block. There is also one in which a terminal member fixed to the contact is brought into contact with the corona wire through a compression coil spring to supply a high voltage from a high voltage power source to the corona wire.

[0005]

However, in the case of the method of connecting the terminal member on the high voltage power source side and the terminal member on the charging device side by such a conventional high voltage power source connection mechanism,
In any of these cases, the terminal members were connected to each other at about 1 to 3 contact points, and therefore there was a risk of contact failure depending on the contact state. In addition, since such a contact portion is oxidized with time, if it is oxidized, a contact failure is likely to occur.

Further, when a cylindrical coil spring is used for contact between these terminals to increase the contact pressure at the contact portion, the spring jumps out from the storage portion when the charging device is attached or detached. It was easy to handle because it was easy, and it sometimes took time to assemble.

The present invention has been made in view of the above problems, and it is possible to surely bring the terminal member on the high-voltage power supply side into contact with the terminal member on the charging device side, and the contact portion also makes contact with time. An object of the present invention is to prevent a defect from occurring, and to prevent the cylindrical coil spring from popping out of the storage portion and taking a long time to assemble when the charging device is attached or detached.

[0008]

In order to achieve the above object, the present invention provides a high voltage power source side connecting member and a terminal member fixed to an end block in a high voltage power source connecting mechanism of an image forming apparatus as described above. One of them is made of an elastic body, and a plurality of independently movable contacts are formed by making a plurality of slit-like cuts at the tip of the elastic body that comes into contact with the other terminal member.

Further, in the high voltage power supply connection mechanism of the image forming apparatus, it is effective if the other terminal member is also made of an elastic body. Further, the plurality of contacts formed on the one terminal member are slidably brought into contact with the flat surface of the other terminal member, and at the time of sliding, the leading end portions of the contacts are locked to remove the contacts. It is advisable to form a stepped portion on the above-mentioned plane to prevent

[0010]

According to the high-voltage power supply connection mechanism of the image forming apparatus having the above-described structure, one of the high-voltage power supply-side terminal member and the terminal member fixed to the end block is formed of an elastic body, and the elastic body Since a plurality of contact elements that can be independently displaced by a plurality of slit-shaped notches are formed at the tip portion, when some of the contact elements are brought into contact with each other, some of the contact elements cause contact failure. Even if it occurs, the other contacts are surely in contact with each other, so that a reliable contact state can always be maintained.

Further, since a cylindrical coil spring is not used for connecting the terminal member on the high-voltage power supply side and the terminal member fixed to the end block, it is likely that it will pop out of the storage portion when the charging device is attached or detached. Not even. If both the high-voltage power supply-side terminal member and the terminal member fixed to the end block are made of an elastic material, they will contact each other more reliably due to the elastic force of the material itself, so that the high-voltage power supply-side receptacle and the charging device Even if the positional relationship is designed roughly, the contact between them can be surely maintained.

Further, a plurality of contacts formed on one terminal member of the high voltage power source side terminal member and the terminal member fixed to the end block are slidably brought into contact with the flat surface of the other terminal member, and at the time of sliding thereof, By forming the stepped portion for locking the tip end portion of the contactor to prevent the contactor from coming off, the connection of the above-mentioned terminal member is made reliable, and the trouble of coming off can be prevented. Further, when the terminal members are connected, they are brought into sliding contact with each other, and at that time, the contact portion is polished by the self-polishing action, so that even if the contact portion is oxidized, poor contact can be prevented.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a perspective view for explaining an embodiment of a high voltage power supply connection mechanism of an image forming apparatus according to the present invention.

The high-voltage power supply connection mechanism of this image forming apparatus is
In order to apply tension to the high voltage power source side terminal member 23 (hereinafter also simply referred to as the terminal member 23) formed of a conductive metal plate fixed to the high voltage power source side receptacle 22 of the high voltage power source and the corona wire 28 of the charging device 25. Is a mechanism for connecting the terminal member 27 fixed to the end block 26 that locks the spring member 24 of the terminal member 27 of the high voltage power supply side terminal member 23 and the terminal member 27 fixed to the end block 26. Is an elastic body such as a phosphor bronze plate.

Then, a substantially middle portion of the elastic terminal member 27 is bent downward at a substantially right angle to form an L-shape, and a plurality of tip portions of the terminal member 27 are in contact with the other terminal member 23. A plurality of contacts 3 that can be displaced independently by making slit-like notches 21
1 is formed, and the tip end portion 31a of each contactor 31 is brought into contact with the end edge 23a of the terminal member 23 on the high-voltage power supply side as shown in FIG. 2 to connect the terminal members 27 and 23. At the time of this connection, the protrusion 2 of the end block 26 shown in FIG.
6a and the guide portion 22a of the high-voltage power supply side receptacle 22 are fitted and positioned.

According to the high-voltage power source connecting mechanism constructed as described above, the terminal member 27 fixed to the end block 26 is formed of an elastic body, and a plurality of slit-shaped notches 21 are formed at the tip of the elastic body. Since a plurality of contacts 31 that can be displaced independently of each other are formed by fitting the charging device 25 with the protruding portion 26a of the end block 26 into the guide portion 22a of the high-voltage power supply side receptacle 22, When inserted in a predetermined position, each contact 31 of the terminal member 27 contacts the end edge 23a of the high-voltage power supply side terminal member 23, as shown in FIG. Edge 23a of member 23
Even if a contact failure occurs or is separated from the other contactor, the other contactor 31 surely contacts, so that a reliable and stable contact state can always be maintained between them.

The connection of the terminal member 23 on the high-voltage power supply side and the terminal member 27 fixed to the end block 26 does not use the compression coil spring 9 wound in a cylindrical shape as described in FIG. Therefore, when the charging device is attached or detached, it does not pop out of the storage part, so handling is easy at the time of attachment or detachment and the operability is improved, and the number of parts is reduced by the amount of the coil spring. be able to.

FIG. 3 shows an embodiment of a high-voltage power supply connection mechanism of an image forming apparatus in which a terminal member fixed to an end block is slidably contacted with a flat surface of a high-voltage power supply-side terminal member to connect between them. The same reference numerals are given to the parts corresponding to those in FIG. In the high-voltage power supply connection mechanism according to this embodiment, the terminal member 27 fixed to the end block is slidably contacted with the flat surface 23b of the high-voltage power supply side terminal member 23 along the direction of arrow C in FIG. Further, an inclined portion 23c for facilitating sliding contact with the terminal member 27 is formed on the inlet side of the high voltage power source side terminal member 23.

With this configuration, when the terminal member 27 and the high-voltage power supply side terminal member 23 are connected, the plurality of contacts 31 formed at the tip end portion of the terminal member 27 have the flat surfaces of the high-voltage power supply side terminal member 23. Since the contact portion is polished by the self-polishing action by sliding on 23b in the direction of arrow C in FIG. 3,
Even if it is oxidized, it is polished to improve conductivity and prevent contact failure.

FIG. 4 shows the high voltage of the image forming apparatus in which both the high voltage power source side terminal member and the terminal member fixed to the end block are elastic bodies so that one terminal member is brought into sliding contact with the plane of the other terminal member. It shows an embodiment of the power supply connection mechanism, and the portions corresponding to those in FIG. 3 are denoted by the same reference numerals. In the high-voltage power supply connection mechanism according to this embodiment, both the terminal member 27 fixed to the end block and the other high-voltage power supply-side terminal member 23 are both formed of an elastic body such as a phosphor bronze plate, and the terminals on the charging device side thereof. The member 27 is brought into sliding contact with the flat surface 23b of the high-voltage power supply-side terminal member 23 along the direction of arrow C in FIG.

With this arrangement, the dimension H between the terminal member 27 and the terminal member 23 on the high-voltage power supply side is set in advance so that the terminal members slightly bend together as shown in the drawing in the contact state. In other words, even if the height relationship between the high-voltage power supply side receptacle and the charging device is roughly designed, the terminal member 2
The contact between 7 and 23 can be ensured.

The high voltage power source side terminal member 23 is pressed in the direction in which the flat surface 23b is pressed against the plurality of contacts 31 of the terminal member 27 by the elastic restoring force of the material itself (upward direction in FIG. 4).
Since the urging force acts on the contact element 31,
The self-polishing action at the time of sliding contact with the top in the arrow C direction becomes more effective.

FIG. 5 shows an embodiment in which a step portion for locking the tip of the contact of the terminal member fixed to the end block is formed on the plane of the terminal member on the high-voltage power supply side. Corresponding parts are designated by the same reference numerals. The high-voltage power supply connection mechanism according to this embodiment includes a plurality of contacts 31 formed on the terminal member 27 fixed to the end block.
Is slidably contacted with the flat surface 23b of the other high-voltage power supply-side terminal member 23, and the tip 31a of the contactor 31 is locked during the sliding so that the contactor 31 does not come off in the direction of arrow E. The step portion 32 (bent twice) for preventing the flat surface 23b
Is formed.

In this way, the connection between the terminal members 27 and 23 is ensured, and it is possible to prevent the problem that they will come off. Although the respective embodiments of the high-voltage power supply connection mechanism of the image forming apparatus have been described above, the side on which the plurality of slit-shaped cuts are formed at the tip portion is the side of the terminal member 27 fixed to the end block as in the above-described embodiments. However, the same operation and effect can be obtained even if it is formed on the high-voltage power supply side terminal member 23 side.

[0025]

As described above, according to the present invention, one of the terminal member on the high-voltage power supply side and the terminal member fixed to the end block is made of an elastic body, and a plurality of contacts are formed at its tip. Therefore, even if contact failure occurs in some of the contact elements when these terminal members are brought into contact with each other, other independently displaceable contact elements are surely in contact with each other, so that it is always reliable. Can maintain a good contact state.

Further, since a cylindrical coil spring is not used for connecting the terminal member on the high-voltage power supply side and the terminal member fixed to the end block, it may pop out from the storage portion when the charging device is attached or detached. It is easy to operate because it never happens. Furthermore, if both the high-voltage power supply side terminal member and the terminal member fixed to the end block are made of an elastic body, they will contact each other more reliably due to the elastic force of the material itself, so the high-voltage power supply side receptacle and the charging device. Even if the positional relationship is designed to be rough, the contact between them can be reliably maintained, the contact pressure and the sliding force can be stabilized, and the spring constant can be reduced.

Further, a plurality of contacts formed on one terminal member of the terminal member fixed to the high-voltage power source side terminal block and the end block are slid on the flat surface of the other terminal member, and at the time of sliding thereof, By forming the stepped portion for locking the tip end portion of the contactor to prevent the contactor from coming off, the connection of the above-mentioned terminal member is made reliable, and the trouble of coming off can be prevented.
Further, when the terminal members are connected, they are brought into sliding contact with each other, and at that time, the contact portion is polished by the self-polishing action, so that even if the contact portion is oxidized, poor contact can be prevented.

[Brief description of drawings]

FIG. 1 is a perspective view for explaining an embodiment of a high voltage power supply connection mechanism of an image forming apparatus according to the present invention.

FIG. 2 is a perspective view showing a connection state in which the tip end portion 31a of each contact 31 is brought into contact with the end edge 23a of the high-voltage power supply side terminal member 23 in the same embodiment.

FIG. 3 is a perspective view showing an embodiment of a high-voltage power supply connection mechanism of an image forming apparatus in which a terminal member fixed to an end block is slidably contacted with a flat surface of a high-voltage power supply-side terminal member to connect between them.

FIG. 4 is a high-voltage power supply connection of an image forming apparatus in which both the high-voltage power supply-side terminal member and the terminal member fixed to the end block are elastic bodies so that one terminal member is brought into sliding contact with the plane of the other terminal member. It is a perspective view which shows the Example of a mechanism.

FIG. 5 is a perspective view showing an embodiment in which a step portion for locking a tip end portion of a contactor of a terminal member fixed to an end block is formed on a flat surface of a high voltage power source side terminal member.

FIG. 6 is a perspective view showing an example of a conventional high-voltage power supply connection mechanism of an image forming apparatus using a compression coil spring at a connection portion between a high-voltage power supply side terminal member and a terminal member fixed to an end block.

FIG. 7 is a perspective view showing an example of a different high-voltage power supply connection mechanism of a conventional image forming apparatus.

[Explanation of symbols]

21 Notch 22 High-voltage power supply side receptacle 23 High-voltage power supply side terminal member 23b Flat surface 24 Spring member 25 Charging device 26 End block 27 Terminal member 28 Corona wire 31 Contact 31a Tip part 32 Step part

Claims (3)

[Claims] 1. An image forming method for connecting a high-voltage power supply-side terminal member fixed to a high-voltage power supply-side receptacle and a terminal member fixed to an end block that locks a spring member for applying a tension to a corona wire of a charging device. In the high-voltage power supply connection mechanism of the device, one of the high-voltage power supply-side terminal member and the terminal member fixed to the end block is an elastic body, and a plurality of slits are provided at a tip end portion of the elastic body that comes into contact with the other terminal member. A high-voltage power supply connection portion of an image forming apparatus, wherein a plurality of contacts that can be independently displaced by forming a notch are formed. 2. The high voltage power supply connection mechanism for an image forming apparatus according to claim 1, wherein the other terminal member is also made of an elastic body. 3. A high-voltage power supply connection mechanism for an image forming apparatus according to claim 1, wherein a plurality of contacts formed on the one terminal member are slidably in contact with a plane of the other terminal member. A high-voltage power supply connection mechanism for an image forming apparatus, wherein a step portion for locking the tip end portion of the contactor during sliding is formed on the plane to prevent the contactor from coming off.