JPS62103674A - Developing device for electronic copying machine - Google Patents

Abstract

PURPOSE:To simplify assembling and to reduce the contacting force between a control member and a photosensitive body-side control part to prevent wear in the early stage by energizing only a developing roll with an elastic member. CONSTITUTION:The gap between a developing roll 8 and a photosensitive body surface 2a is kept at a prescribed value by a disc 17 and some projecting part of a control member 28, and the spring force of a coiled spring is weakened to simplify assembling because only the developing roll 8 is energized by the coiled spring 18, and further, the attaching work of a developing device is simplified because it is sufficient if only a housing 7 is attached to a copying machine body 1 to attach the developing device. A control member 28 is shaken to vary the length of projecting parts brought into contact with the disc 17 and the gap between the developing roll 8 and the photosensitive surface 2a is adjusted to many stages. Since a shaft 14 of the developing roll 8 is connected to the driving side through a biaxial parallel joint 19 or a universal joint, it is rotated smoothly even if the developing roll 8 is moved.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a developing device for an electronic copying machine.

Conventional technology In a developing device in which a developing roll is disposed in a housing, this developing roll is opposed to a photoreceptor, and the developer is conveyed to the surface of the photoreceptor by the developing roll for development, the developing roll and the photoreceptor are It is necessary to maintain the gap to the surface at a predetermined value.

As a structure for maintaining this gap at a predetermined value, for example, a regulating member is provided on the housing side, the entire housing is pushed toward the photoreceptor by a spring, and the housing-side regulating member is brought into contact with the photoreceptor. A device is known in which the gap between the photoreceptor and the surface of the photoreceptor is maintained at a predetermined value.

Problems to be Solved by the Invention Since the entire housing is pushed, a strong spring is required, which makes installation and removal troublesome, and the regulating member on the No-Ujifugu side contacts the photoreceptor with a large force, causing premature wear. Put it away.

Means and Function for Solving Problems: A developing roll can be freely moved in and out of a housing toward the photoreceptor center, and is biased toward the photoreceptor side by an elastic member, and a regulating member provided on the developing roll side is used to regulate the photoreceptor side. The elastic force of the elastic member can be reduced by pressing it against the elastic member.

Embodiment A drum-shaped photoreceptor 2 is rotatably supported in the main body 1 of the copying machine, and around it are a charger 3, a developing device 4, and a transfer unit ls.
5. Cleaning devices 6 and the like are arranged in sequence.

The developing device 4 has a developing roll 8, a conveying roll 9, and an agitation roll 10 disposed in a housing 7, and the developing roll 8 faces the photoreceptor surface 2tL from the opening of the housing 7.

The housing 7 has a bottom side housing 11 and an opening side housing 12 connected through an insulator 13,
The housing 11 on the bottom side is grounded, and as a result, the housing 12 on the opening side facing the photoreceptor 2 is in an electrically floating state, so that the charge on the photoreceptor 2 does not leak from the housing 12 on the opening side. In addition, the static electricity generated when the developer in the housing 7 is stirred flows from the bottom housing 11 to the ground and does not accumulate in the housing 7, causing sparks (discharge) to nearby conductive objects and adversely affecting the copying equipment. I have nothing to give.

The shaft 14 of the developing roll 8 passes through the elongated hole 15 of the opening-side housing 12 and is rotatably supported by a bearing body 16.
At its end, there is a regulating member on the side of the developing roll, for example, a disc 17.
is fixed, and the bearing body 16 is biased toward the photoconductor 2 by an elastic member, for example, a coil spring 18, so that the developing roll 8 is pushed toward the center of the photoconductor 2, and the shaft 14 is It is connected to a rotating shaft 21 equipped with a gear 20 through a joint, for example, a two-axis parallel joint 19, which allows eccentricity of the motor 24 through first and second gears 22 and 23. It is connected to an output shaft 25, and the output shaft 25 is connected to the conveyance roll 9 via a clutch 26. Either the central part or both ends of the biaxial parallel joint 19 is an insulator to electrically float the developing roll 8,
Even if the Tebe bias is used, this is to prevent leaks and problems.

Note that a universal joint may be used instead of the biaxial parallel joint 190.

A photoreceptor-side regulating portion, for example, a regulating member 28, is swingably supported on the shaft 27 of the photoreceptor 2, and first, second, and third protrusions 29, 30, 31 are provided at one end of the regulating member 28. are formed, and the distances of each protrusion from the axis 27 are different, so that the disc 17 comes into contact with any one of the protrusions, and an arc is formed on the other end of the regulating member 2g. A groove 32 is formed, and the bolt 33 is screwed into the fixed side 34 through the arcuate groove 32 so that any one of the protrusions can be fixed at a swinging position where it abuts against the disc 17.

Because of this, the gap between the developing roll 8 and the photoreceptor surface 2α can be maintained at a predetermined value by the disc 17 and the protruding portion of the regulating member 28, and only the developing roll 8 is attached by the coil spring 18. Since the spring force is weakened, assembly is easy, and the developing device only needs to be attached to the copying machine body 1 by attaching the housing 7, which simplifies the work.

Furthermore, the length of the protrusion that contacts the disk 17 can be varied by swinging the regulating member 28, and the gap between the developing roll 6 and the photoreceptor surface 2α can be adjusted in multiple stages.

Moreover, since the shaft 14 of the developing roll 8 is connected to the drive side via a biaxial parallel joint 19 or a universal joint, the developing roll 8 can rotate smoothly even if it moves.

Note that the elastic member may be a leaf spring 35 as shown in FIGS. The shaft 14 may be brought into contact with the photoreceptor-side regulating portion.

As shown in FIG. 6, the conveyor roll 9 has a sleeve 36 made of grooved aluminum and a plastic ring 37 at both ends.
or both ends 9 as shown in Figure 7.
Aluminum IJ-P3 with only α polished to a mirror finish and the central portion 9b processed with a rough surface by sandblasting, and furthermore, as shown in FIG. 8, a groove 37' is formed only in the central portion 9b.
8, the frictional resistance at both ends 9α of the transport roll 9 is smaller than that at the center 9b, and the 9th
The length of the magnet roll 8α of the developing roll 8 shown in the figure is the same as the length of the central portion 9b. In FIG. 9, 8b is a sleeve.

Because of this, when the developer is transported by the transport roll 9, the amount of developer is small at both ends qa, and the amount of developer is small at the center 9.
Since the number increases in b, the sleeve 8 of the developing roll 8
The developer can be uniformly adhered onto the developing roll 8 without much developer adhering to both ends where the magnet roll 8α is not present in b.

In other words, when the developer is uniformly adhered and transported by the transport roll 9, the adhesion of the developer is weak at both ends of the developing roll 8 where the magnet roll 8α is not present, and the developer falls outward, so that the developer is not transported by the transport roll 9. More developer adheres to both ends and less to the center, making it impossible to achieve uniform development.

In addition, the gap S between the regulating plate 39 that regulates the adhesion height of the developer on the transport roll 9 and both end portions 9α is defined by the central portion 9b.
− becomes smaller than the gap S.

This allows the amount of developer attached to both end portions 9α to be further reduced.

The cleaning device 6 is provided with a blade 41 in the housing 40 to scrape off the toner remaining on the photoreceptor surface 2a and collect it in the housing 40.
The toner in the container 0 is collected in the container W#43 within a conveyance member 42 such as a bead chain.

Because of this, it is necessary to replace the container 43 when it becomes full of toner.

Therefore, as shown in FIG. 10, the container 43 is supported via a spring 44' so that the container 43 is successively lowered by the weight of the toner, and the container 43 is held at a predetermined position with a predetermined weight lighter than the full weight. When it descends to this point, a detection member 44 such as a switch or a photo interlamp is configured to detect it.

This detection signal is sent to the judgment circuit 46 of the control mechanism 45.
The signal is input to the memory 47 along with the start signal of the copying machine, and the signal is output to the memory 47 to which both signals are input.
It is calculated based on the number of copies input by the memory 47, and is output to the judgment function section 48. When the number of copies is 0 to X, it is output to the first display section 49, and when the number of copies is 7, it is output to the second display section It is configured to output to the display section 50, and output to the third display section 51 when the number of sheets is y or more. However, at<y.

The first display section 49 displays a warning that can only be seen by repair experts, the second display section 50 displays a warning that can be seen even by general users, and the third display section 51 prohibits copying operations.

Since it is like this, when the detection member 44 performs the detection operation,
The judgment circuit 46 is activated by the detection signal and the start signal, and from that time on, the first display section 49
to enable repair professionals to detect warnings.
When inspecting the container 43 at regular intervals, it is determined that a large amount of toner has accumulated in the container 43, and the container 43 is replaced.

Furthermore, while copying :tsyy sheets, the second display 50
, the general user can detect that a large amount of toner has accumulated in the container 43, and can contact a repair specialist.

When y or more copies are made, it is determined that the container 43 is full of toner, and the third display section 51 is activated to prohibit the copying operation, thereby preventing the toner from overflowing into the container 43.

Therefore, a warning can be displayed in two stages before the container 43 becomes full of toner, making it easier to determine whether the container tube should be replaced before the container 43 becomes full.

Furthermore, since the control mechanism 45 is actuated by ANDing the start signal, even if the container 43 vibrates as a result of moving the double or zero machine and the detection member 44 operates to detect it, it will not malfunction.

11 and 12 show other embodiments of the container, and the container 4
3 is made of a transparent material and has a narrow protrusion 43m, and the narrow protrusion 43g has a substantially U-shaped first and second full detection sensor 52.
At the same time, the first and second full detection sensors 52 and 53 are stacked on the fixed side 54 so as to be movable and adjustable in the vertical direction, and when the first full detection sensor 52 operates, a warning is issued. The copying operation is prohibited when the second groove detection sensor 53 performs a detection operation.

In this way, when a warning is detected, a repair specialist can be contacted and the container 43 can be replaced before the copying operation is prohibited, eliminating the waiting time for container replacement, and the first and second full detection sensors 52 and 53 can be replaced. The location can be changed depending on the time required for the repair specialist to arrive.

Although the cleaning device 6 is provided with a blade 41 within the housing 40, a fur brush roll may be provided instead of the blade 410.

In each of the above embodiments, the photoreceptor 2 is drum-shaped, but it may also be belt-shaped.

In this case, as shown in FIG.
A guide rail 60 is provided along the guide rail 60, and along this guide rail 60, a U-shaped support 64 having a bottom plate 61 and vertical plates 62 and 63 on both sides is provided so as to be removable. and both end plates 66 are rotatably attached to a rectangular mounting frame 67, and a bracket 68 fixed to one end plate 66 is moved up and down with a pin 70 to a bracket 69 fixed to one side vertical plate 63. In addition to freely connecting,
A receiver 71 fixed to the other end plate 66 is brought into contact with a pedestal 72 fixed to the other vertical plate 62 to hold the mounting frame 67 on the support body 64 in a substantially horizontal position.

An inclined holding member 73 is supported on the bracket 68 so as to be movable up and down by a pin 74, and a strut horn: -75 facing the inclined holding member 73 is fixed to the vertical plate 63 on one side,
The inclined holding member 73 has a bottom surface 73α and one side surface 73b bent in a dogleg shape, and is pivotally connected to one end of a rod 76 passing through the both side plates 65 of the mounting frame 67 through a pin 77, and the other end protrudes forward from the other side plate 65,
The stopper 75 is biased toward one side plate 65 by a spring 78, and the stopper 75 is pressed against the top surface 7 on which the bottom surface 7311 is placed.
5α and a protrusion 75b with which a bent portion 73'b of one side 73b engages.

Under normal conditions, the bottom surface 731g of the inclined holding member 73 is the top surface 751 of the stopper 75! At the same time, the receiving piece 71 abuts against the pedestal 72 and the mounting frame 67 is held in a substantially horizontal position.

When inspecting the belt-shaped photoreceptor 2, open the door (not shown) of the copying machine main body 1 and move the holder 64 to the guide rail 6.
0, pull out the bottle 70 by holding the mounting frame 67 with your hand.
Rotate upwards around the center.

At this time, since the tilt holding member 73 is given a clockwise rotational force about the pin 74 via the rod 76 by the spring force of the spring 78, the mounting frame 67 rotates upward about the pin 70. According to the bottom surface 731 and the top surface 75cL
The inclined holding member 73 is sequentially moved clockwise, and when it is rotated to a predetermined rotational position, the bent portion 73'b is
engages with the protrusion 75b of the stopper 75.

If you release your hand from the mounting frame 67 in this state, the mounting frame 67 will try to rotate downward around the bottle 70, but one side surface 73b of the inclined holding member 73 will touch the protrusion 75b of the stopper 75.
Since the inclined holding member 73 does not rotate counterclockwise, the mounting frame 67 is held in an inclined position, and the belt-shaped photoreceptor 2 can be easily inspected.

In addition, when returning to the horizontal position, the mounting frame 67 is rotated slightly upward from the above-mentioned state, and the one side surface 13b and the protrusion 75
b, and then pull the rod 76 against the spring 78 to rotate the inclined holding member 73 counterclockwise so that the bottom surface 738
is positioned on the upper surface 75α and rotated downward about the pin 70.

Because of this, the mounting frame 67 can be easily held in an inclined position or easily returned to a horizontal position.

Effects of the Invention Since only the developing roll 8 is biased by an elastic member, the elastic force may be weak, which simplifies assembly, and also simplifies installation and removal of the developing device.Moreover, the regulation member and the photoconductor side are not restricted. It is possible to prevent premature wear due to the reduced contact force with the parts.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a general schematic front view, FIG. FA2 is a sectional view of the main part, FIG. Partial sectional view, Figure 5 is the 4th
6, 7, and 8 are perspective views showing different embodiments of the conveyance roll, FIG. 9 is a plan view of the developing roll and the conveyance roll, and FIG. 11 is a sectional view of the toner amount detection device in the container, FIG. 12 is a perspective view thereof, FIG. 13 is a front view when a belt-shaped sensitive material is used, and FIG. Figure 14 is a side view;
FIG. 15 is a detailed cross-sectional view, and FIG. 16 is a detailed view of the Z section in FIG. 15. I is the main body of the copying machine, 2 is the photoreceptor, 7 is the housing, and 8 is the developing roll. Figure 1, 1 Figure 2 Figure 4') Figure 5 Figure 10 Figure 12 Figure 13 Figure 14 7゜

Claims (1)

[Claims] A developing roll 8 is provided in the housing 7 so as to be able to move in and out toward the center of the photoreceptor 2, and is urged toward the photoreceptor 2 side by an elastic member, and regulating members provided on the eight developing rolls are used to regulate the photoreceptor side. A developing device for an electronic copying machine, characterized in that the developing device is pressed against a portion of the electronic copying machine.