JP2000293056A - Recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure capable of electrically connecting a transfer roller and a high-voltage substrate arranged at a separate position with easy operation. SOLUTION: A harness 21 is connected to the high-voltage substrate 20, a ring-shaped connection terminal 22 is attached to the tip of the harness 21 and fit to the projecting part 17a of a projecting base 17 supporting one end of a coil spring 13 for pressing the transfer roller 11 to a photoreceptor, and the spring 13 is held on the fit part thereof. Thus, the terminal 22 is pressed and fixed on the projecting part by the spring force of the spring 13 and also the contact of the terminal 22 with the spring 13 is secured, then high voltage is supplied to the transfer roller from the substrate 20 through the harness 21 and the spring 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus such as a printer, a facsimile, a copying machine, etc., which uses a transfer roller for transferring a toner image formed on a photoreceptor to recording paper.

[0002]

2. Description of the Related Art In a recording apparatus of this type, a high voltage is applied to a transfer roller from a high-voltage substrate (for example, 2 mA, 800 V). The connection structure between the transfer roller and the high-voltage substrate is as follows. I was

That is, as shown in FIG. 4, one end of a spring 2 for pressing the transfer roller 1 against a photoreceptor (not shown) is folded back like a ring, and this ring portion is directly connected to a connection terminal of the high voltage substrate 3. 4. As shown in FIG. 5, a sheet metal 6 is pressed against the end surface of the shaft 1 a of the transfer roller 1, and a terminal at the tip of a harness 7 is attached to the sheet metal 6 by using a screw 8. A configuration for connecting to the high-voltage substrate 9 was also known.

[0004]

However, according to the above conventional example, the following problems have occurred.

That is, in the connection structure shown in FIG. 4, the high-voltage board 3 must always be arranged near the transfer roller mounting position. This high-voltage board 3 has a considerable substrate area, so that the degree of design freedom is high. It was severely restricted. In the connection structure shown in FIG. 5, the sheet metal 6 must be fixed so as to be always in contact with the transfer roller shaft 1a. Since the shaft 1a rotates in contact with the sheet metal 6, there is a problem that noise such as a key is generated.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and it is possible to easily assemble while employing a configuration in which a high-voltage substrate is disposed at a position separated from a transfer roller, and furthermore, it is possible to generate noise. It is an object of the present invention to provide a recording device having no connection structure.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional problems, the present invention connects a connection member such as a harness having a connection terminal at a tip to a high voltage substrate, and connects the connection terminal to a transfer roller. Is pressed between the end of the pressing means for pressing the photoreceptor and the convex table holding the pressing means, and is pressed and fixed to the convex table by the spring force of the pressing means. As described above, by indirectly connecting the transfer roller and the high-voltage substrate via the connection member, it is not necessary to dispose the high-voltage substrate near the transfer roller, and the degree of freedom in apparatus design can be increased. By pressing and fixing the connection terminal to the convex base by pressing means for pressing the transfer roller, it is not necessary to fix the screw as in the conventional case, so that the number of parts can be reduced and the assemblability can be improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is directed to a projection for inserting a conductive pressing means for conducting to a transfer roller and pressing the transfer roller against a photoreceptor at one end of the pressing means. And a high-voltage board that supplies a high voltage to the transfer roller on the high-voltage substrate having a holding surface having a surrounding holding surface, a connecting member having a connection terminal configured to allow the protrusion to be inserted at the tip. The connecting terminal at the end is connected so that the convex portion is inserted into the convex base, and is pressed and fixed to the convex base by one end of a pressing means.
With this configuration, the transfer roller and the high-voltage substrate can be connected via the connection member and the pressing unit. Therefore, it is not necessary to dispose the high-pressure substrate near the transfer roller.
The degree of freedom in device design can be expanded. In addition, the connection terminal is fitted to the projection of the projection base, and is pressed and fixed to the projection base by the pressing means from above, so that the connection terminal is securely contacted with the pressing means without using a screw as in the conventional case. And the number of parts can be reduced, assembling work becomes easy, and assemblability can be improved.

According to another embodiment of the present invention, in addition to the configuration of the above-described embodiment, a cylindrical space is provided around the above-mentioned convex base integrally with the convex base, and the pressing base is housed with the convex base as a bottom. Is formed, and an opening through which a connection terminal can be inserted is formed in the convex base and the corner of the protective cover. When the protective cover forming the cylindrical space is provided in this manner, one end of the pressing unit can be aligned with the convex portion of the convex base only by inserting the pressing unit into the cylindrical space. Work becomes easier. Also,
By forming an opening through which the connection terminal can be inserted into the corner of the projection and the protective cover, the connection terminal can be pushed obliquely upward into the cylindrical space, and the pressing means is set in the cylindrical space. However, the connection terminal can be inserted between the projection and the end of the pressing means while pushing up the end of the pressing means riding on the projection with the connection terminal in a direction away from the projection,
Assembly can be easily performed.

In still another embodiment of the present invention, the connection terminal of the connection member has a ring shape into which the projection of the projection is inserted. When a ring-shaped connection terminal is used, a projection is inserted into the connection terminal, so that even if the connection terminal is pulled, the connection terminal is hooked on the projection and does not come off. Detachment from the table can be reliably prevented.

An embodiment of the present invention shown in the drawings will be described below. FIG. 1 is a cross-sectional view schematically showing a connection structure between a transfer roller and a high-voltage substrate in a recording apparatus according to one embodiment of the present invention. FIG. 2A shows a coil spring viewed in the direction of arrow AA in FIG. FIG. 2 (b) is a schematic cross-sectional view showing a removed state, and FIG.
It is the schematic bottom view seen in the -B direction. 11 is a transfer roller,
Reference numeral 12 denotes a bearing that supports the transfer roller 11, and is formed of a conductive resin. Reference numeral 13 denotes a coil spring made of a conductive material that constitutes a pressing unit for pressing the transfer roller 11 against a photoconductor (not shown). One end of the coil spring 13 is connected to the bearing 12. Reference numeral 15 denotes a resin-made conveyance guide which accommodates the transfer roller 11 and has a guide portion (not shown) for guiding recording paper before and after the transfer roller 11. A protection cover 16 is formed integrally with the transport guide 15 to form a cylindrical space for accommodating the coil spring 13, and a projection 17 is formed integrally with one end of the protection cover and forms a bottom of the cylindrical space. It is a stand. The convex base 17 has, at its center, a holding surface 17b around a convex portion 17a that can be inserted into one end of the coil spring 13. In addition,
The bearing 12 supporting the transfer roller 11 is
So that it can be pressed against a photoconductor (not shown).
The transfer guide 15 is held movably with respect to the transfer guide 15 by the coil spring 13. However, when the transfer guide 15 is removed from the recording apparatus, an appropriate stopper (not shown) is used to prevent the transfer roller 11 from falling off. The movement is restricted. Further, the coil spring 13 is
The spring force is set so that the bearing 12 and the projection 17 are pressed even when the movement is restricted by the stopper. Openings 18 are formed in the corners of the protective cover 16 and the projection 17 so that a connection terminal to be described later can be inserted.

Reference numeral 20 denotes a high-voltage substrate provided with a power supply for supplying a high voltage to the transfer roller 11, and reference numeral 21 denotes the high-voltage substrate 20.
And a round terminal, that is, a ring-shaped connection terminal 22 having a size capable of inserting the convex portion 17a at a tip thereof. Note that the connection terminal 22 is not limited to the round terminal shown in the figure, and a terminal of another type such as a U-shape may be used. The high-voltage substrate 20 does not need to be provided at a position close to the transfer roller 11, and is disposed at a desired position in the apparatus.
The length of the harness 21 is determined according to the position.

In the connection structure having the above-described structure, the connection terminal 22 at the tip of the harness 21 is arranged on the projection 17 in such a manner that the projection 17a is inserted, and the coil spring 13 has one end fitted to the projection 17a. It is attached in a combined form. Thus, the coil spring 13 presses the transfer roller 11 toward the photoreceptor (not shown) and presses and fixes the connection terminal 22 to the convex base 17 by the reaction force. The terminal 22 can be fixed at a predetermined position and can be electrically connected to the coil spring 13.

When assembling the connection structure having the above structure, first, the connection terminal 22 at the tip of the harness 21 is connected to the opening 1.
8 and inserted over the convex base 17, the holes of the connection terminals 22 are fitted on the convex parts 17 a and put on the convex base 17, and then attached to the bearing 13 from above the cylindrical space of the protective cover 16. The coil spring 13 is inserted, its tip is fitted to the projection 17a, and the bearing 13 is attached to the transport guide 15. As a result, the coil spring 13 is provided with the convex table 17 and the transport guide 15.
The connection terminal 22 is compressed by the bearing 13, which is restrained from moving outward by the stopper provided on the projection base 1.
7 and can be fixed. As described above, the assembly can be performed by a simple operation without the need for screwing work.

The coil spring 13 may be set on the projection 17 before the connection terminal 22 is set on the projection 17. In that case, as shown in FIG. 3, the connection terminal 22 is pushed obliquely upward from the opening 18 to
While pushing up the lower end of the coil spring 18 pressed against the convex base 17, the coil spring 18 is inserted onto the convex part 17 a while being pushed up.
a may be fitted. Thus, even after the coil spring 13 is set, the connection terminal 22 is connected to the coil spring and the projection 17.
And can be easily inserted and connected.

[0016]

As is apparent from the above description, the present invention provides a high-voltage substrate between a convex base supporting one end of a conductive pressing means for pressing a transfer roller against a photoreceptor and the pressing means. The connection terminal provided at the tip of the connection member connected to
The transfer roller and the high-voltage substrate are indirectly connected to each other by using a connection member by arranging the protrusion formed on the protrusion to be inserted and pressing and fixing the protrusion to the protrusion by pressing means. Therefore, it is not necessary to dispose the high-voltage substrate near the transfer roller, so that the degree of freedom of the device design can be expanded. Further, the connection between the connection terminal and the pressing means is screwed as in the conventional case. Since there is no need to use the above, there is an effect that the number of parts can be reduced, the assembling work is facilitated, and the assemblability can be improved. Further, since it is not necessary to press the sheet metal against the transfer roller shaft to secure electrical conduction, there is also obtained an effect that noise is not generated unlike the case where a conventional sheet metal is used.

Here, a protection cover is provided around the projection and integrally with the projection so as to form a cylindrical space having the projection as a bottom and for accommodating the pressing means. Forming an opening through which the connection terminal can be inserted in the corner portion makes the assembly work easier, and even after the pressing means is set in the cylindrical space, the connection terminal can be used to press the pressing means on the convex base. The connection terminal can be inserted between the convex base and the pressing means while pushing up the end, so that an effect that the assembly can be easily performed is obtained.

Further, if the connection terminal of the connection member is formed in a ring shape into which the projection of the convex base is inserted, the connection terminal is pulled out of the connection terminal even if the connection terminal is pulled when the projection is inserted into the connection terminal. Therefore, it is possible to obtain an effect that the connection terminal can be reliably prevented from coming off the convex base.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically showing a connection structure between a transfer roller and a high-voltage substrate in a recording apparatus according to an embodiment of the present invention.

2A is a schematic cross-sectional view as viewed in the direction of arrow AA in FIG. 1 and shows the coil spring removed. FIG. 2B is a schematic bottom view as viewed in the direction of arrow BB in FIG.

FIG. 3 is a schematic sectional view showing a state where a connection terminal is inserted in the embodiment shown in FIG. 1;

FIG. 4 is a schematic perspective view showing a conventional example of a connection structure between a transfer roller and a high-voltage substrate.

FIG. 5 is a schematic perspective view showing another conventional example of a connection structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Transfer roller 12 Bearing 13 Coil spring (pressing means) 15 Transport guide 16 Protective cover 17 Convex base 17a Convex part 17b Holding surface 18 Opening 20 High-voltage board 21 Harness (connection member) 22 Connection terminal

Claims (3)

[Claims] 1. A pressing device comprising: a conductive pressing unit that is electrically connected to a transfer roller and presses the transfer roller against a photoreceptor; a protrusion inserted into one end of the pressing unit; and a holding surface around the protrusion. A convex base for holding one end of the means, a high-voltage board for supplying a high voltage to the transfer roller, and a connection terminal on one end which is inserted into the convex part and pressed and fixed to the convex base by one end of the pressing means; A recording device comprising: a connection member having the other end connected to the high-voltage board. 2. The pressing device according to claim 1, further comprising: a conductive pressing unit that is electrically connected to the transfer roller and presses the transfer roller against the photosensitive member; a protrusion inserted into one end of the pressing unit; and a holding surface around the protrusion. A convex base that holds one end of the means, a protective cover that forms a cylindrical space that houses the pressing means with the convex base as a bottom, a high-voltage board that supplies a high voltage to the transfer roller, and the convex part is inserted. A connection member having at one end a connection terminal pressed and fixed to the convex base by one end of the pressing means, and a connecting member connected to the high-voltage board at the other end, and at a corner of the convex base and the protective cover. A recording apparatus having an opening through which the connection terminal can be inserted. 3. The recording apparatus according to claim 1, wherein the connection terminal of the connection means has a ring shape into which the projection is inserted.