JPS60135968A - Copying machine - Google Patents

Abstract

PURPOSE:To load easily a photosensitive sheet to a drum without scraping a developer by providing a means which inserts a plate material into the space between the drum and a tuft part of the developer of a developing device. CONSTITUTION:In case that papers are removed at a jam time or a separate unit of a copying machine body is opened for the purpose of replacing a photosensitive sheet, side plates 1 and 1' are turned and are set to the inclined state, and a sliding plate 14 reaches a position distant from a projecting part 16 of a bottom plate 19, and therefore, the sliding plate 14 is moved downward by its dead weight, and a wire 8, a sheet metal 9, and a protective plate 10 fall down. Simultaneously, a developing device body 3 is turned in the direction of an arrow A with a shaft 4 as the pivot by its dead weight, and therefore, a space having a certain width is generated between a drum 17 and the developing device body 3, and the protective plate 10 is inserted into this space. Then, a photosensitive sheet 21 is inserted from the side of a side plate 2 to the side of a side plate 1 opposite to it so that it is wound around the outside circumference of the drum 17. In this case, since the protective plate 10 shields to the drum 17 of a tuft part 18 of the developer of the developing device 3, the tuft part 18 is not brought into contact with the inserted photosensitive sheet 21.

Description

[Detailed description of the invention] Technical fields> Mizumoto Ryl is related to copying machines.

<Prior Art> A copying machine has a drum and a developing device (developing tank) inside, but since the positional relationship between the drum and the developing device is fixed, the photoreceptor sheet's relationship with the drum is Attaching the developer tank through the gap is a very difficult task.

Conventionally, when installing a photoreceptor sheet, a mechanism was provided to transport the developing device to a location quite far away from the drum, and a mechanism was provided to transport the developing device to a location quite far away from the drum, and remove the spikes of developer attached to the drum and the developing device (adhering to the area around the magnetic roller in the developing device). A gap having a predetermined distance is provided between the outer edge arc-shaped protruding portion that contacts the outer periphery of the developer drum, and a photoreceptor sheet roller is inserted into the gap to prevent the developer from falling from the developing device. Ta.

However, the gap between the drum and the developing device cannot be made sufficiently large due to restrictions on the dimensions of the entire copying machine. Also, if the gap is too wide, the photoreceptor sheet may warp, creating the risk that the developer may fall.

<Purpose of development> Therefore, in the case of mizumoto, the copying machine is equipped with a means for inserting a plate material into the gap between the drum and the developer spike of the developing device, so that the developer can be removed without scraping it off. It is an object of the present invention to make it possible to easily load a photoreceptor sheet onto a drum.

Example The configuration of Mizumototsu 1 will be described below with reference to the drawings.

FIG. 1 shows a structural diagram of a developing device of a copying machine according to an embodiment of the present invention.

In the figure, 3 is the main body of the developing device, which is suspended on a shaft 4 passing through the main body. The developing device 3 is rotatable about the shaft 4. Arrows A and B indicate the direction of rotation.
It was shown in

The shaft 4 is held at both ends by two opposing side plates 1 and 2, and the side plates 1 and 2 are configured to be rotatable about a fulcrum 5. That is, it rotates to the side plates 1', 2' at the positions indicated by the two-dot chain lines.

Incidentally, as the side plates 1 and 2 move, the shaft 4 also moves in the same direction.

A cover 6 is attached to the developing device main body 3,
Furthermore, another cover 7 is covered above the cover 6. The cover 7 has a width extending from the side plate 1 to the side plate 2, and is bent from slightly inside at both ends thereof and extends for a predetermined length in a direction parallel to the planes of the side plates 1 and 2. A wire 8 having a shape that crosses the gap between the two is adjacently provided. The bent portion of M111 within the wire 8id serves as a fulcrum 20 and is rotatable.

The wire 8 is provided with the side plates 1 and 2 of the wire 8.
A sheet metal 9 was previously installed that was loosely fitted on both edges of the part that crossed the gap between the two, and a rectangular protective plate IO
are joined face-to-face on the longitudinal sides.

The metal plate 9 moves up and down by passing between the cover 6 and a guide plate 110 fixed with a gap in front of the cover 6.

Further, a hook 12 is connected to the wire 8 at its end closer to the side plate l. A sliding plate I4 that slides on the side plate 1 and engages with the hook 12 is attached to a region of the side plate 1 opposite to the position where the hook 12 is formed. This is done by drilling two elliptical holes X and Y in the sliding plate 14, and inserting stepped screws I3 into each of the elliptical holes X and Y, respectively.
When screws a and +3b are inserted through the elliptical holes X and Y, the stepped screws +3a and +3b are movable within the range where they come into contact with the upper or lower ends of the elliptical holes X and Y, respectively.

This sliding plate 14 slides in the vertical direction of the side plate 1f, but one end is locked to the other end of a spring 15 fixed to the side plate 1, so that it is constantly urged downward. There is.

However, since the sliding plate 14 rests on the convex portion 16 of the bottom plate 19 that holds the bottom surface of the developing device main body 3, the step screws 18a, 13b do not move in spite of the physical elastic force of the spring 15. are stationary at positions where they abut against the lower ends of the holes x and y.

Now, during the copying operation, as shown in FIG. 2 (each part number means the same as in FIG. 1), the side 472+ is in a horizontal state, and the protrusion 16 pushes up the sliding plate 14. Therefore, in conjunction with this, the wire 8. The metal plate 9 and the protection plate 10 are lifted upward (to an upper side away from the contact point between the drum 17 and the developer spike portion of the developing device 3).

Next, when removing the string in the event of a jam or opening the separation corner of the copying machine main body to replace the photoreceptor sheet, etc., refer to Figure 3 (each part number means the same as in Figure 1).

), the side plate +(+')d rotates and becomes tilted, and the sliding plate 14 reaches a point away from the convex part 16 of the bottom plate 19, so the sliding plate 14 is moved by its own weight. The step screws +3a and +3b move downward, that is, the stepped screws +3a and +3b are inserted into the oval hole x.
, y, so that said wire 8. The metal plate 9 and the protection plate 10 also fall downward.

At the same time, the developing device main body 3 also rotates in the direction of arrow A around the shaft 4 due to its own weight, so that a gap of a certain width is created between the drum 17 and the developing device main body 30. The protection plate 10 is then inserted.

Then, the photoreceptor sheet 2+ is inserted from the front side plate 2 side to the opposite side plate 1 side so as to be wound around the outer periphery of the drum 17. At this time, since the protection plate 10 completely shields the front side of the developer spike portion 18 of the developing device 3 near the drum 17, the spike portion 18 comes into contact with the inserted photoreceptor sheet 21 and its arcuate shape Parts cannot be partially or completely cut and fall off.

Of course, the above matters also apply when the photoreceptor sheet 21 is inserted and removed.

The present invention provides a plate member that is coupled to a moving member when the photoreceptor sheet is attached or removed, and is movable in the direction of fully opening and closing the front surface of the developer tank facing the drum by moving the moving member, and when the photoreceptor sheet 1 and the stone are removed, the plate member This is a copying machine with the 'x4'J feature in which the plate material is interposed in the gap between the JJ and the developing tank. According to I'l's copying machine, in accordance with the trend toward more compact devices, the photoreceptor sheet can be moved with the minimum amount of movement without having to make use of the limited space available, and without making the developing device far apart from the entire drum. You can reliably flush the entire replacement developer on a safe day without worrying about contact with it.

[Brief explanation of drawings]

Figure 1 shows the developing device 1'' of a copying machine related to the example of the misfire in January.
FIG. 2 is a side cross-sectional view of the copying machine during copying operation, and FIG. 3 is a structural diagram of the photoconductor sorting device "i" of the copying machine.
Time? FIG. , Near)...1:1', 2,2'...Side plate, 3.Developing device body, 4...° axis, 6,7.Cover, 8.Wire, 9...
sheet metal. 10...Protection plate, 11...Guide plate, 12...Hook. 18a', +8b... step screw, 14... sliding plate, 15
Spring, 16 Convex portion, 17 Drum, +8 Developer spikes, 2+ Photoreceptor sheet.

Claims (1)

[Claims] 1. A copying machine characterized by being completely equipped with means for inserting a plate into the gap between the drum and the developer spike of the developing device.