JPH036919Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a jig for setting the main pole of a developing roller 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 mentioned.

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 inside 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 paper cassette type paper feed cassette 20 and a paper feed roller 21. The copy paper is fed one by one from a sheet-like copy paper layer 23 housed in the paper 20.

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 heating 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 outline of the copying machine has been described above, 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 an arrow 42 in FIGS. 1 and 2 on the outside, and a magnet roller 44 that has a magnet embedded inside. The magnetic developer 46 in the device 8 is
Any type of magnet may be used as long as it has the effect of magnetically holding the sleeve 43 on the peripheral surface of the sleeve 43, but the magnet N' (hereinafter referred to as the main pole) facing the rotating drum 6 is In order to prevent excess developer 46 from adhering to the surface on which the electrostatic latent image is not drawn, the developer 46 is directed to the position closest to the rotating drum 6 and the developing roller 41, or the sleeve 4
Depending on the rotation speed of No. 3, it may be necessary to fix the position so as to be shifted by a slight angle toward the upstream side in the rotation direction.

Therefore, when assembling a copying machine, it is necessary to precisely align the direction of the main pole N' in a certain direction.
Conventionally, a magnet having a polarity opposite to that of the main pole N' was disposed at a predetermined position, the magnet roller 44 was allowed to rotate freely, and the attraction between the magnetic poles was used to position the magnet roller 44. A method has been adopted in which a mark is placed on the position of the main pole N' of the magnet roller 44 and the adjustment is made by visual measurement.

However, in the former method, the magnetic roller 44
Due to the heavy weight of the main pole N, the attraction force between the magnetic poles does not rotate the magnet roller 44 to a strictly accurate position, resulting in some errors.On the other hand, in the latter method, the main pole N The positioning of ' is not sufficiently accurate, and as a result, there have been cases where the image corresponding to the original is fogged, trailing, and poor density occur on the final copy paper.

The present invention aims to solve these drawbacks by providing a jig for detecting the position of the main pole of the developing roller and setting it at a predetermined position. The main points of the configuration of the position detection jig are as follows: First, the jig is used to set the main pole of the developing roller at a predetermined position. When set, a swingable magnetic body is attached to the mirror, which is oriented toward the main pole by the attractive force of the main pole.
The mirror is configured to detect the inclination of the reflected direction of light incident from a predetermined direction to detect the shift in the position of the main pole. Alternatively, a magnet body that can be displaced in the repulsion direction is provided, and the main pole can be confirmed in terms of magnetic polarity based on the direction of displacement of the magnet body.

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 an explanatory diagram of the structure of the main pole position detection jig of the developing roller according to the above embodiment, including the main pole magnetic polarity confirmation means, and FIG. A perspective view showing the operation of the tool, FIG. 7 is a view corresponding to FIG. 5 of another 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 conveyance section, etc. as shown in FIG. Regarding the main pole position detection jig G of the roller, the present invention is a type in which the developing roller 41, the developer storage tank 47, the developer conveying section, etc. are not integrated into a unit, but are directly integrated into the main body of the copying machine. It can also be applied to things.

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 replenishing 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 roll 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 jig G for detecting the main pole position of a developing roller of 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, there is a main pole detection member 53 having a freely swinging magnetic body 55 and a mirror 56 inside the casing 54, and the main pole detection member 53 is used when the developing device unit 65 is set at a predetermined position. The main pole detection member 53 is arranged so that the distance between the swing axis P of the main pole detection member 53 and the axis Q of the developing roller 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 inclination 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, the light from the projector 52 that passes through the line T' on the semi-transparent plate 59 and is reflected by the mirror 56 is reflected. On the optical axis, lens 6
3 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 T, and on the line segment connecting the axis Q of the developing roller 41 and the swing axis P of the main pole detection member 53, QP
One point on the line segment extended in the direction is U, casing 5
A point on the reflective surface of the mirror 60 fixed to the mirror 54 is R, a point on the light receiving surface 62 of the light receiving section 61 attached to the casing 54 is S, and the reflective surface of the mirror 56 is a line segment PQ. Assuming that they are parallel, the above R point satisfies ∠QPT=∠UPR.

Further, the lens 63 has a focal length f so as to satisfy the following relationship: 1/TP+PM+1/RM+SR=1/f.

The light-receiving section 61 has a light-receiving surface 62 which is an imaging screen for the image of line T' of the semi-transparent plate 59, and the light-receiving surface 62 is the fourth
As shown in the figure, it has an oval shape, the reference line 62' is drawn on the right half, and the reference line 62' is drawn on the left half.
A uniform scale 64 parallel to 2' is provided. The light reflected by the mirror 56 at a predetermined position as described above is finally reflected by the mirror 60, and an image of line T' is projected onto the light receiving surface 62.

In the embodiment, a mirror 60 is provided in order to make the entire jig for detecting the main pole position of the developing roller of a copying machine compact. It is also possible to arrange.

As shown in FIG. 5, the projector 52 is supplied with power via a power supply switch 72. As shown in FIG. This power supply switch 7
2 is turned on only when the lever 71 is pressed against itself. A magnet 70 is attached to the tip of the lever 71, and a magnetic pole n having the same polarity as the main pole N' is formed on one side of the magnet 70 on the developing roller 41 side, and a main pole n is formed on the opposite side. very
A magnetic pole s having a polarity opposite to N' is formed.

The operation of the above embodiment will be explained below. First, the jig G is set at a predetermined position relative to the developing roller 41. The slit 75 normally provided on the shaft 74 of the magnet roller 44 and the main pole
Since the position of N′ has a nearly constant relationship during manufacturing,
Using the direction of this slit 75 as a guide, the main pole N' is generally directed toward the jig G. At this time, if the slit 75 is a single straight groove as shown in Fig. 5, the direction may be changed by 180 degrees.
Normally, no magnetic pole is formed on the side 180° opposite to the main pole N', or a magnetic pole opposite to the main pole N' is formed. is not repelled, and the lever 71 is turned off by the power supply switch 7.
2 is not pressed, so the projector 52 is not powered.
On the other hand, if the main pole N' is correctly oriented in the direction of the jig G, the main pole N' will repel the magnet 70, so the lever 71 will turn on the power supply switch 72, and the projector 52 will be supplied with power. . In this way, the magnet 70, the lever 71, and the power supply switch 72 constitute means 73 for confirming the directivity of the main pole N' with respect to the magnetic body 55 in terms of magnetic polarity, that is, from the viewpoint of magnetic polarity. Once you confirm that it is lit, you can orient the main pole N' roughly in the direction of the jig G without making any mistakes.

Next, the main pole N' is precisely aligned with the predetermined position, but if the position of the main pole N' is tilted from the predetermined position, the The main pole detection member 53 is also inclined from a predetermined position because the magnetic body 55 is attracted to the main pole N'. Let this inclination angle be θ radians. FIG. 6 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, it passes through the line T' of the semi-transparent plate 59 from the projector 52,
Since the light reflected by the mirror 56 is tilted at an angle of 2θ, 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 shifted by (+) sin2θ from the normal predetermined position. It turns out. However, if θ is small, this deviation is approximately calculated as 2θ×(+).

This allows the inclination of the main pole N' to be quantitatively displayed on the light receiving surface, but in this embodiment, since (+) 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 62', the main pole N' of the developing roller 41 can be accurately set.

FIG. 7 shows another embodiment, in which the constituent elements are the same as those of the above embodiment, but the feature is that the arrangement is horizontal. That is, the optical path l from the light projector 52 to the light receiving surface 62 via the main pole detection member 53 is arranged approximately along the axis of the developing roller 41. With this arrangement, a sufficient length of the optical path l can be obtained without increasing the height of the jig G.

Further, as another embodiment, magnetic polarity confirmation means 73
Instead of using the power supply switch 72, the lever 71 may be used to cut off the optical path l.
Further, in the above embodiment, the lens 63 is used to form an image of the line T' on the semi-transparent plate 59 onto the light-receiving surface 62, but a slit is provided in place of the semi-transparent plate 59 and the line T'. It is also possible to use the light source from the projector 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 a photoelectric element or the like may be used.
It is also possible to electrically detect the inclination of the main pole N' of the developing roller 41.

As described above, the present invention provides a jig for setting the main pole of the developing roller at a predetermined position, and when the jig is set at a predetermined position relative to the developing roller, the suction force of the main pole A mirror is attached to a swingable magnetic body that is oriented in the direction of the main pole, and the shift in the position of the main pole is detected by detecting the inclination of the reflection direction of light incident on the mirror from a predetermined direction. and a magnetic body that can be displaced in the attracting or repelling direction depending on the magnetic body of the main pole,
This jig for detecting the main pole position of a developing roller is characterized in that the main pole can be confirmed in terms of magnetic polarity by the direction of displacement of the magnet, so it is possible to quickly roughly position the main pole. By using this, the main pole of the developing roller can be set at an appropriate position, and the movement of toner from the developing roller to the rotating drum surface can be accurately controlled, so that the toner image on the copy paper is It is possible to prevent fogging, trailing, poor density, etc., and it is possible to make high-quality copies.

If the developing device is made into a unit and detachably attached to the jig for detecting the main pole position of the developing roller according to the present invention, the inclination of the main pole of the developing roller can be adjusted extremely easily and accurately, reducing the number of manufacturing steps. This also makes it 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. FIG. 3 is a side sectional view of a developing roller main pole position detection jig G 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 an explanatory diagram of a configuration including main pole magnetic polarity confirmation means of the main pole position detection jig of the developing roller according to the above embodiment;
FIG. 6 is a perspective view showing the operation of the developing roller main pole position detection jig according to the above embodiment, and FIG. 7 is a view corresponding to FIG. 5 of another embodiment. Explanation of symbols, 41...Developing roller, 52...Light projecting section, 53...Main pole detection member, 55...Magnetic material,
56...mirror, 61...light receiving section, 62...light receiving surface,
70...Magnet, 71...Lever, 72...Power supply switch, 73...Magnetic polarity confirmation means.

Claims (1)

[Scope of utility model registration request] In a jig for setting the main pole of the developing roller 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 be oriented in the direction of the main pole. A mirror is attached to a swingable magnetic body, and the tilt of the reflection direction of light incident on the mirror from a predetermined direction is detected, and the shift in the position of the main pole is detected. Detection of the main pole position of a developing roller, characterized in that a magnet body that can be displaced in an attraction or repulsion direction according to the magnetic polarity of the developing roller is provided, and the main pole is confirmed in terms of magnetic polarity according to the direction of displacement of the magnet body. jig.