JPH0245870Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a jig for setting the main pole of a developing roller of a copying machine at a predetermined position.

First, an overview of a general copying machine will be explained with reference to FIG. 1, and problems related to the setting of the main pole of the developing roller will be discussed.

The illustrated electrostatic copying machine has a housing generally designated by the number 1, and a transparent plate 2 on which an original to be copied is placed is disposed on the upper surface of the housing 1.
Further, on the upper surface of the housing 1, a transparent plate 2 and a document presser 3 which can be opened and closed to cover the document placed on the transparent plate 2 are attached (in FIG. 1, the document presser 3 covers the transparent plate 2). The interior of the housing 1 is divided by horizontal plates 4 and 5 into an upper space and a lower space. and,
A rotating drum 6 having a photoreceptor on its circumferential surface is rotatably mounted approximately in the center of the lower space.

Around the rotating drum 6, which is rotated in the direction shown by the arrow 7, there are sequentially a charging area 9, an exposure area 10, a developing area 11, a transfer area 13, a peeling area 14, and a cleaning area 15 when viewed in the direction of rotation. It is arranged. A charging corona discharger 12 is provided in the charging area 9, a suitable developing device 8 is provided in the developing area 11, a transfer corona discharger 16 is provided in the transfer area 13, and a stripping area 14 is provided. There is a corona discharger for peeling 1.
7 is disposed, and a cleaning device 18 is disposed in the cleaning area 15.

A copy paper conveying means, generally designated by numeral 19, is disposed in the lower part of the lower space of the housing 1. As shown in FIG.
A copy paper supply means is provided at one end of the copy paper transport means 19, the right end in FIG. In the illustrated copying machine, the copy paper supply means is composed of a copy paper supply device 22 composed of a cassette type paper feed cassette 20 and a paper feed roller 21. Sheet copy paper layer 23 housed in cassette 20
Copy paper is fed sheet by sheet from

The copy paper sent out from the paper feed cassette 20 passes through a guide plate 24 and is fed to a pair of transport rollers 25.
The copy paper fed to the pair of conveying rollers 25 is then transferred to the guide plate 22 by the action of the pair of conveying rollers 25.
It is conveyed to the transfer area 16 and the peeling area 17 through the transfer area 16 and the peeling area 17 . The image is then conveyed by the action of a suitable conveyor belt mechanism 27, and sent to a heat fixing device 31 consisting of a heating roller 28 in which a heater 30 is disposed, and a pressure roller 29 that is in pressure contact with the heating roller 28. be provided. Thereafter, the copy paper is discharged to a paper discharge tray 32 provided at the left end of the housing 1 shown in FIG.

On the other hand, in the upper space above the horizontal plates 4 and 5 in the housing 1, a document placed on a transparent plate 2 is scanned and exposed, and an image of the document is projected onto a photoreceptor on a rotating drum 6 in an exposure area 10. The whole number 33 for projecting
An optical device shown in is provided. This optical device 33 includes an original irradiation lamp 34 for irradiating the original placed on the transparent plate 2, a first reflecting mirror 35 for projecting reflected light from the original onto a photoreceptor, and a second mirror 35 for projecting light reflected from the original onto a photoreceptor. It has a reflecting mirror 36, a third reflecting mirror 37, a lens assembly 38, and a fourth reflecting mirror 39. During scanning exposure, the document irradiation lamp 34 and the first reflecting mirror 35 move substantially horizontally from the scanning exposure start position shown by the solid line to a required position (for example, the maximum scanning exposure end position 35' shown by the two-dot chain line). The second reflecting mirror 36 and the third reflecting mirror 37 are moved at a required speed V.
is a predetermined position from the scanning exposure start position indicated by the solid line (for example, the maximum scanning exposure end position 3 indicated by the two-dot chain line).
6' and 37') at a speed of V/2, which is half of the above-mentioned required speed. At this time, the reflected light from the original irradiated by the original irradiation lamp 34 is sequentially reflected by the first reflecting mirror 35, the second reflecting mirror 36, and the third reflecting mirror 37, and is reflected by the lens assembly 38.
, and then reflected by the fourth reflecting mirror 39,
The light passes through an opening 40 formed in the horizontal plate 4 and reaches the photoreceptor located on the outer periphery of the rotating drum 6 in the exposure area 10 . When the scanning exposure is completed, the document illumination lamp 3
4, first reflecting mirror 35, second reflecting mirror 36, third
The reflecting mirror 37 is returned to the scanning exposure start position shown by the solid line.

In the copying machine as described above, while the rotating drum 6 is rotated in the direction shown by the arrow 7,
In the charging zone 9, a charging corona discharger 12 charges the photoreceptor substantially uniformly to a specific polarity, and then in the exposure zone 1.
At 0, the optical device 33 projects an original image, thus forming an electrostatic latent image corresponding to the original on the photoreceptor. Thereafter, in the developing area 11, the developing device 8 applies a developer to the electrostatic latent image on the photoreceptor to develop the electrostatic latent image into a so-called toner image. Next, in the transfer area 13, the copy paper fed through the guide plate 26 by the conveyance roller 25 is brought into contact with the photoreceptor.
The toner image on the photoreceptor is transferred onto the copy paper by the action of the transfer corona discharger 16. Thereafter, in the peeling area 14, the copy paper is peeled off from the photoreceptor by the action of the peeling corona discharger 17. The copy paper onto which the toner image has been transferred is then conveyed to a fixing device 31, where the toner image is heated and fixed, and then discharged onto a paper discharge tray 32.

On the other hand, the rotating drum 6 continues to rotate further, and in the cleaning area 15, the toner and static charge remaining on the photoreceptor after the transfer are removed and disappeared by the action of the cleaning device 18.

The above is an overview of the copying machine, and the relationship between the rotating drum 6 and the developing roller 41 will be explained in detail.

The developing roller 41 consists of a hollow cylindrical sleeve 43 that rotates in the direction of arrow 42 in FIGS. 1 and 2 on the outside, and a magnet roller 44 that has a magnet embedded inside. Any type of material may be used as long as it has the effect of magnetically holding the developer 46 made of a magnetic material conveyed from the agent conveyance section 45 on the circumferential surface of the sleeve 43. drum 6
The magnet N' (hereinafter referred to as the main pole) facing the rotary drum 6 is connected to the rotary drum 6 to prevent excess developer 46 from adhering to the surface of the rotary drum 6 on which the electrostatic latent image is not drawn. It is directed to the position E closest to the roller 41, or depending on the rotation speed of the sleeve 43, it is fixed so as to be located upstream of the sleeve 43 in the rotation direction by a certain angle α. There is a need.

Therefore, when assembling a copying machine, the main pole
Although it is necessary to accurately align the direction of N' in a certain direction, conventionally a magnet with a polarity opposite to that of the main pole N' is arranged at a predetermined position and the magnet roller 44 is made rotatable. Using the suction between
After positioning the magnet roller 44, set it or set the main pole of the magnet roller 44.
A method was used in which a mark was placed at the N' position and the adjustment was made by visual measurement.

For this reason, the positioning of the main pole N' was not accurate, which sometimes caused fogging, trailing, poor density, etc. on the image corresponding to the original on the final copy paper, and the positioning of the main pole N' Determining the location required skill and was time-consuming.

The purpose of the present invention is to provide a jig for detecting the position of the main pole of the developing roller and setting it at a predetermined position in order to solve these drawbacks. In a jig for setting the main pole of the developing roller of a machine at a predetermined position, when the jig is set at a predetermined position relative to the developing roller, the suction force of the main pole causes the main pole to move in the direction of the main pole. In the past, a mirror was attached to a swingable magnetic body, and the shift in the position of the main pole was detected by detecting the inclination of the reflection direction of light incident on the mirror from a predetermined direction. The present invention provides a jig for a developing roller of a certain copying machine.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples embodying the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention.

FIG. 2 is a side sectional view of a developing device unit in which the developing roller 41, developer storage tank 47 and developer conveying section are combined into one unit, and FIG. 3 is a developing roller jig according to an embodiment of the present invention. A side sectional view of tool G, FIG. 4 is a partially enlarged view in the direction of arrow B in FIG. 3,
FIG. 5 is a perspective view showing the operation of the main pole detection member of the developing roller jig according to the above embodiment.

The following embodiment is a development example of a copying machine that is compatible with a commonly used unit including the developing roller 41, developer storage tank 47, developer transport section, etc., as shown in FIG. Although this invention relates to the roller jig G, the present invention can also be applied to a type in which the developing roller 41, developer storage tank 47, developer conveyance section, etc. are not integrated into a unit but are directly incorporated into the main body of the copying machine. It is something.

First, the developing device unit 65 will be explained. The developing device unit 65 consists of a developer storage tank 4 provided at the upper part of the unit casing 48.
7. Developer 46 provided at the bottom of the tank 47
a replenishment roller 49 for conveying the developer, an agitation roller 50 for stirring and conveying the developer 46, a developing roller 41 for conveying and adhering the developer 46 to the electrostatic latent image portion on the circumferential surface of the rotating drum 6, and a developing roller. A guide 51 and the like that guide the excess developer 46 cut off at the upper part of the developer 41 to the stirring roller 50 are integrally housed in the casing 48. By making the developing device into a unit in this way, Easy sealing structure and main pole of the developing roller 41
It has features such as easy adjustment of N'.

FIG. 3 shows a developing roller jig G for a copying machine according to an embodiment of the present invention, which is compatible with the developing device unit 65 described above.

In the figure, inside the casing 54 there is a main pole detection member 53 having a freely swingable magnetic body 55 and a mirror 56, and the main pole detection member 53 has a developing device unit 65 set at a predetermined position. In this case, the swing axis P of the main pole detection member 53 and the axis Q of the developing roller are arranged such that the distance is a constant distance. The swing axis P of the main pole detection member 53 is set at approximately the center of gravity of the main pole detection member 53.

Further, an opening 58 is provided in the casing 54 on a line connecting the swing axis P of the main pole detection member 53 and the developing roller 41.

Note that it is preferable that the reflective surface of the mirror 56 of the main pole detection member 53 includes the swing axis P of the main pole detection member 53.

A floodlight 52 is provided above the main pole detection member 53.
The light projector 57 is composed of a translucent plate 59 and the like having a line T' drawn parallel to the swing axis P of the main pole detection member 53 provided on the optical axis of the light projector 52. , is fixed to the casing 52 with the optical axis of the projector 52 directed toward the swing axis P of the main pole detection member 53.

In addition, when the main pole detection member 53 is oriented toward the main pole N' set at a predetermined position, light from the projector 52 passes through the line T' on the semi-transparent plate 59 and is reflected by the mirror 56. On the axis, lens 63
are arranged with their optical axes aligned. Furthermore, a mirror 60 that reflects the light that has passed through the lens 63 is fixed to the casing 54 on the extension of the optical axis, and the light that has passed through the lens 63 is reflected by the mirror 60. A light receiving section 61 provided in the upper opening of the casing 54 is disposed on an extension of the optical axis of the reflected light.

Here, for the following explanation, the line of the semi-transparent plate 59 is
The position of T' is fixed at T, and one point on the line segment extending in the QP direction on the line segment connecting the axis Q of the developing roller and the swing axis P of the main pole detection member 53 is fixed to the casing 54. Let R be the point on the reflective surface of the mirror 60, S be the point on the light-receiving surface 62 of the light-receiving section 61 attached to the casing 54, and further assume that the reflective surface of the mirror 56 is parallel to the line segment PQ. Then, the above point R satisfies ∠QPT=∠UPR.

Further, the lens 63 has a focal length f that satisfies the following relationship: 1/TP+PM+1/RM+SR=1/f.

The upper light-receiving section 61 has a light-receiving surface 62 that is an imaging screen for the image of the line T' of the semi-transparent plate 59, and the light-receiving surface 62 is as shown in FIG. 4 when viewed from the direction of arrow B in FIG. As shown in the figure, it has an oval shape, and a reference line 62' is drawn on the right half, and a uniform scale 64 parallel to the reference line 62' is provided on the left half.
As mentioned above, the light reflected by the mirror 56 at a predetermined position finally passes through the position of the reference line 62' and the line
An image of T' is projected onto the reference line 62'.

In the embodiment, a mirror 60 is provided in order to make the entire developing roller jig of a copying machine compact. However, the light receiving section 61 may be disposed on an extension of the straight line PR without having the mirror 60. It is possible.

The operation of the embodiment described above will be explained below. When the position of the main pole N' of the developing roller 41 is tilted from a predetermined position, a main pole swingably disposed at a position opposite to the main pole N' of the developing roller 41 is inclined. The detection member 53 is also inclined from a predetermined position because the magnetic body 55 is attracted to the main pole N'. Let the angle of the inclination be θ radian. FIG. 5 is a diagram showing the inclination of the main pole detection member 53, where the solid line indicates the normal predetermined position and the two-dot chain line indicates the inclined state.

By the way, when the main pole detection member 53 is tilted by θ, the actual deviation of the main pole is rθ, and the angle of the light that passes from the projector 52 through the line T' of the semi-transparent plate 59 and is reflected by the mirror 56 is tilted by 2θ. Therefore, the image of the line T' that passes through the lens 63, is reflected by the mirror 60, and appears on the light-receiving surface 62 is also shifted by (PR+RS) sin2θ from the normal predetermined position. However, when θ is small, this deviation is approximately calculated as 2θ×(PR+RS).

This allows the inclination of the main pole N' to be quantitatively displayed on the light receiving surface, but in this embodiment, since (PR+RS) is quite large, the inclination of the main pole N' of the magnet roller 44 is magnified. The light receiving surface 62
will be displayed.

Therefore, the operator rotates the magnet roller 44 around its axis while looking at the light-receiving surface 62 to align the line.
By fixing the magnet roller 44 with a set bolt or the like at a position where the image of T' coincides with the reference line T', the main pole N' of the developing roller 41 can be accurately set.

In the above embodiment, the lens 63 was used to form the image of the line T' on the semi-transparent plate 59 onto the light-receiving surface 62, but a slit was provided in place of the semi-transparent plate 59 and the line T', and the projector It is also possible to use the light source from 52 as a point or line light source with parallel luminous flux,
In this case, the lens 63 becomes unnecessary.

Further, in the above embodiment, the light receiving surface 62 is a semi-transparent screen, but it is also possible to electrically detect the inclination of the main pole N' of the developing roller 41 using a photoelectric element or the like.

As described above, the present invention provides a jig for setting the main pole of a developing roller of a copying machine at a predetermined position, and when the jig is set at a predetermined position relative to the developing roller, the main pole A mirror is attached to a swingable magnetic body that is oriented toward the main pole by attractive force, and the tilt of the reflection direction of light incident on the mirror from a predetermined direction is detected to determine the position of the main pole. This jig for the developing roller of a copying machine is characterized by being configured to detect misalignment, so by using this jig, the main pole of the developing roller can be set at an appropriate position, and the main pole of the developing roller can be set at an appropriate position. Since the movement of toner to the rotating drum surface can be accurately controlled, it is possible to prevent fogging, trailing, poor density, etc. of toner images on copy paper, and it is possible to make high-quality copies.

Furthermore, if the developing device is made into a unit and detachably attached to the developing roller jig of the copying machine according to the present invention, the inclination of the main pole of the developing roller can be adjusted extremely easily and accurately, and the manufacturing cost can also be reduced. It becomes possible to increase the effect.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a general copying apparatus, FIG. 2 is a side sectional view of a developing device unit, and FIG. 3 is a side sectional view of a developing roller jig according to an embodiment of the present invention.
Figure 4 is a partially enlarged view in the direction of arrow B in Figure 3;
The figure is a perspective view showing the operation of the main pole detection member of the developing roller jig according to an embodiment of the present invention. Explanation of symbols, 41...Developing roller, 52...Light projecting section, 53...Main pole detection member, 55...Magnetic material,
56...mirror, 61...light receiving section.

Claims (1)

[Scope of utility model registration request] In a jig for setting the main pole of the developing roller of a copying machine at a predetermined position, when the jig is set at a predetermined position relative to the developing roller, the suction force of the main pole causes the main pole to move in the direction of the main pole. A mirror is attached to a swingable magnetic body that is oriented in a direction, and the tilt of the reflection direction of light incident on the mirror from a predetermined direction is detected to detect a shift in the position of the main pole. A jig for a developing roller of a copying machine, which is characterized by: