JPS60114868A - Image forming device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, the transport unit and the like move toward and away from the image carrier in conjunction with the opening and closing of the opening/closing door of the main body! 1 relates to an image forming apparatus.

Conventionally, in image forming apparatuses, especially copying machines, copy sheets are transferred from a cassette or other storage unit to one paper feed roller, usually one A conveyance guide member consisting of a pair of plate shapes, a conveyance roller,
It is made to travel while being restrained by the fixing row 2 and the like.

On the other hand, as is well known, the properties of the sheet itself are constantly changing due to changes in environmental temperature and humidity, so it is not always easy to reliably transport a copy sheet throughout its entire travel process under any circumstances. It was an internal problem to completely prevent paper jams.

Moreover, when this jam occurs, it not only makes it impossible to make copies, but also has disadvantages such as wasting valuable copying time by manipulating various parts of the device to remove jammed paper. there were. Therefore, it is extremely important to configure a copying apparatus so that when a jam occurs, a means for detecting the jam occurs and a means for easily and quickly removing the jammed paper.

Conventionally, for this reason, the sheet conveying section near the transfer site where the toner image on the photoconductor is transferred to the copy sheet, where it is most difficult to remove the jammed sheet, was constructed integrally and included a transfer charger. The unit is made into a unit, and the entire unit is swingable. A swing mechanism and an operating handle are provided at the bottom of the unit, and by manually operating the handle, the transfer area can be freely moved toward and away from the photoreceptor, thereby preventing jamming. Even when jammed paper occurred, a space was created to remove jammed paper and the paper was removed.

However, this was an unpleasant task for the operator.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a new image forming apparatus that is improved in view of these drawbacks.

Another object of the present invention is, first, to greatly reduce the amount of jam clearance operations that should not be neglected and the time required for them.

In addition, the photoconductive layer of the photoreceptor, which is the image carrier, has a weak strength, so great care must be taken not to damage it during maintenance, and there is a risk that the photoconductive layer may deteriorate due to exposure to light. There is.

Therefore, if the photoreceptor is damaged or exposed to light during jam removal or maintenance, the device body or one or more image forming means are integrated into a unit. In addition to installing a photoreceptor protective cover on the
When the door of the main body of the apparatus is opened for maintenance, the transfer conveyance unit is automatically swung to separate the unit from the photoreceptor, and the photoreceptor protection cover enters into a sufficient space to protect the transfer section. This is to ensure that

As described above, by automating manual operations such as jam removal and maintenance, it is possible to shorten operation time and greatly improve operability, and it is also possible to protect the photoreceptor, which is the basic purpose. It becomes possible to provide an image forming apparatus that is close to maintenance-free.

First, let's look at an actual IMi example of a copying machine to which the present invention can be applied.
This will be explained in detail according to the figures.

Figure 1 is an Lfc cross-sectional view showing the side surface of a copying machine to which the present invention is applied, with the side cover provided on the copying shaft body that can be opened and closed, folded forward to open it, and a portion cut away. be. Inside the copying machine main body 100, a cylindrical photoreceptor 2 having a center axis extending perpendicular to the plane of the paper, a developing device 31, a cleaner 4, and a charger 5 arranged near the periphery are integrated into one frame 1a. These members are attached to each other and constitute a unit 1 as a whole. And this unit 1 is
After opening the opening/closing door (not shown) placed on the support guide portions Sa and Sb fixedly fixed inside the copying machine body and forming the shadow of the fc support member S, and arranged on the front side of the copying machine body, It can now be pulled out towards the front of the page.

Below the unit 11 containing the photoreceptor, there are disposed a transfer belt holder 8a, a separation roller 8b, etc. mounted on the right end of the unit 11, which will be described below. Photoreceptor 2
Above the lens system L is fixed to the support member S.
E is placed on the top of the copying machine, and original -M't- is placed on the top of the copier.
A transparent glass plate G is placed on it and reciprocated from side to side as shown in the figure. moves to one side, and when the light source illuminates the document surface, the reflected light from the document surface passes through the lens system LE and reaches the band 1! An electrostatic latent image is formed by forming an image on the surface of the photoreceptor which is uniformly charged by the device 5, and the latent image is transferred to the position of the developing device 3 by riding on the photoreceptor rotating in the direction of the arrow. As a result, a toner image is formed.

On the other hand, the transfer materials in cassette (C) engaged with the main body of the copying machine are sequentially fed into the machine by paper feed rollers 6 starting from the top, and are aligned with the toner image on the surface of the photoreceptor by registration rollers. The belt reaches a transfer site with a device 8a, and the toner image is transferred to the transfer material, and the transfer material carrying the toner image is further separated from the photoreceptor by the separation means of the separation row 28b, and then passed through the conveyance path 9 and fixed. It is fixed and fixed by the container 1o and is discharged outside the machine.

On the other hand, after the transfer is completed, the photoconductor further rotates L1. After the developer that did not contribute to the transfer is removed by the cleaner 14,
The process of copying the same machine as before begins again.

Next, a conventional example of the present invention will be explained.

A transfer conveyance unit rotatable about a support shaft 12, which has a copy sheet conveyance path 9 below the unit 1 including the IgA light body 2, a separation roller sb upstream thereof, and a transfer charger 8a. There are 11.

Below the unit 11, there is a shaft support plate 13 of the same type on the bottom of the main body of the copying machine, and a lever 15 rotatable about a shaft 14 supported by this is attached to the bottom of the transfer conveyance unit 11. It holds the roller 16 that presses the attached leaf spring 17.

For this reason, the lever 15 is normally in a position where it can form an image as shown in the figure, but it can be rotated counterclockwise by manual operation using an operation handle (not shown). The transfer/transport unit 11 can be lowered to secure a space with the photoreceptor 2, and jam removal and maintenance can be performed.

In such a copying apparatus, the second embodiment of the present invention will be described next.
The configuration will be explained with reference to the perspective view shown in the figure.

The bottom plate 20 of the main body of the copying device, which is located below the photoreceptor 2, is formed into a concave shape in the dead space between it and the rubber feet 21. A plywood 22 for unitizing mechanical parts is attached to the bottom surface. A support fitting 23 is attached to this, and a lever 24 is swingably suspended thereon by a foot shaft 25.

The lever 24 is connected to the transport unit 11 to which the copy sheet transport path 9, separation roller 8b, and transfer charger 8a are mounted, and a support plate 13 mounted to the bottom plate of the main body of the apparatus.
A roller 26 is rotatably attached to the shaft 28 to rotate the side plate 52 (see Fig. 3) about the shaft 12.

The lever 24 is equipped with a tension spring that has the weight of the transfer/transport unit 11 and a biasing force that can constantly press the unit 11 to a predetermined position near the photoreceptor 2 (portions 50 and 51 shown in FIG. 3). 27 is tensioned. Therefore, when the lever 24 is given a rotation release action, it is rotated clockwise about the shaft 25, and under normal conditions, the top surface of the conveyance unit ll is moved against the main body of the copying machine, as shown in FIG. It can come into contact with the reference positions 50 and 51 of the side plates and be in a position where image formation is possible.

On the front door 30 side of the bottom plate 20 of the main body of the copying machine, there is an arm support stand 31 of the same type equipped with a rotation hinge 30a for the front door 30).
An arm 32 is attached to the support base 31 so as to be swingable about a shaft 36.

The arm support stand 31 has a shaft at the 36th position! '& A long arc-shaped hole 31b is formed in the center, and its displacement range is the position where the arm 32 simultaneously opens the front door 30 as shown in Figure 2 and regulates its position, and the position shown in Figure 3. This is the angle until the front door 30 is closed and the door catch 45 attached to the side plate 53 of the main body of the device and the front door catch 46 reach a specified position where they engage.

Also, one arm 32 has a shaft 34 of the same type, and a part of this shaft (on the back side of the figure) is connected to the elongated hole 3 of the arm support base 31.
1b and is loosely fitted, and the axial direction is regulated from the penetrating side by a flat washer (not shown) with a larger width than the long width and an E-shaped stop ring.

Further, in front of the shaft 34, a joint lever 33 rotatable via a shaft 35 is loosely fitted into the lever 24 for raising and lowering the aforementioned conveyance 22) 11.
The axial direction is regulated and installed using a larger diameter flat washer and an E-shaped stop ring.

A shaft 34 of the same type as the arm 32 described above penetrates and loosely fits into the elongated hole 31b of the arm support base 31.
The reason why the position is restricted in the axial direction by an electronic washer and an E-type stop ring (not shown) on the back side is that the joint lever 33 has a tension spring that serves to push up the conveyor 11 via the lever 24. Since the traction force of 27 strongly pulls the shaft 34 and the arm 32 in the direction shown in the figure (Fig. 2), a moment is generated around the fulcrum 36 of the arm 32 in the direction of tilting the arm 32 in the direction C shown in the figure. is intended to suppress this power.

A shaft 37 of the same type is provided at the other end of the arm 32, and this shaft passes through a long 38a of an arm base 38 fixed to the front door 30 and is loosely fitted therein. hand,
Further, while maintaining an appropriate gap in the axial direction that allows the screw to slide through the long hole with a flat washer of a larger diameter than that shown in the figure, it is fixed with a υ screw to the back bait in the figure.

This screw can be easily installed and removed, for example by removing the d screw and manually lifting the arm 32 in the direction of the front side plate 53 of the device main body (see Figure 5). Automatically conveyed by the traction force of the tension panel 27)
11 is raised and its position is regulated at a predetermined position.

A tension spring 69 is attached to a portion 52a in the direction of the other end of the arm 26, and the other end of the tension spring 39 is
End portion 38 of arm stand 68 fixed to front door 6o
cVC is attached.

The tension spring 39 is attached with almost a free length in the state shown in FIG. 2, and is tensioned in the state shown in FIG. 6 in which the H image can be formed.

This tension spring 39/l'i applies tension to raise the transfer conveyance unit while the front door 3o is rotating from the state shown in FIG. 2 in which it is opened to the state shown in FIG. 6 in which it is closed. This is a braking spring to prevent sudden closing due to the traction force of the shingle spring 27.The force acting in the direction E to open the front door 6° as shown in FIG. 6 by the tension shingle spring 39 is 4th year middle school
5 and 46, and furthermore, when the operator rotates and opens the front door 3o in the E direction, the operator only needs to manually apply the door catch engagement force and the rest is to open the front door. It also has the function of automatically assisting the user by the traction force of the tension spring 39, making it extremely easy to operate.

Next, to explain the operating procedure, in Fig. 2,
The front #30 is moved around the hinge part 31a of the arm support stand 31, and is attached to the long part 38a of the arm stand 38 fixed to the front door 30 with a shaft 3 and a screw (not shown). When the shaft 37 of the arm 32 is moved from the open end point of the elongated hole 38a, which is the end of movement of the arm 32 loosely fitted in the hole 38a, to the closed direction of the arrow C, the shaft 37 of the arm 32 is moved.
The arm base moves from the point of the elongated hole 38a on the third day to the direction of the elongated hole 38b, which is the other end of the elongated hole. At the same time, the arm 32 is also fixedly attached to the arm 32 and has a shaft 34 centered on the axis 36 of the arm support stand 31. Move while regulating the position in the C direction.

Further, along with the above movement, the hinge lever 33, which is loosely fitted to the shaft 34 of the same type on the arm 32, also moves in the same direction as the arm 32.

As a result of this movement, the lever 24 at the bottom of the transport unit (11) inside the main body of the apparatus begins to rotate clockwise around the shaft 25. A tension spring 27 is tensioned in this direction of rotation. The transport unit) 11 is automatically pushed up to the reference position 50 or Fi 51 on the side plate of the main body of the apparatus.

At this point, the front door 3o engages with the door catch 45 attached to the side plate of the main body of the device and the door catch 46 attached to the front door 3o itself, and is maintained in a normal state where image formation is possible. .

In order to return the front door 30 to the open position, the front door is rotated open and the above-mentioned reverse operation is performed to enable jam removal and maintenance.

In addition, since the transport unit 11 can be brought into contact with and separated from the photoreceptor 2, when the front door 3o is opened and the transport unit 11 is separated from the photoreceptor 2, the photoreceptor stock number cover 18 attached to the transport unit l (Fig. 1) can be entered into the F direction, which is the space obtained by moving the above-mentioned transport unit, and can maintain the distance between the transfer part of the photoreceptor 2. In the case of the copying machine of this embodiment, the transport unit 1 is pulled out toward the front in the figure when replenishing developer, so at this time, the forward bending is linked to protect it from damage caused by external light and handling. By doing so, you can create a skewer that serves your purpose.

As explained above, according to the configuration of the present invention, the transport unit is linked with the opening/closing door in a balanced manner so that it can come into contact with and separate from the image forming section, so that jam handling, etc., becomes very easy and safe.

Furthermore, since it can be linked with an opening/closing door such as a protective cover, it is also possible to prevent scratches and deterioration caused by exposure to light.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of a copying apparatus to which the present invention is applied, FIG. 2 is a perspective view showing the transport unit in an open state, and FIG. 3 is a sectional view showing the door in a closed state. . In the figure, 11Fi transport unit, 24 is a lever, 3
0 is the front door, 32 is the arm, 33 is the door lever, 3
8 is the arm stand, 39 is the tension spring O

Claims (2)

[Claims] (1) In an image forming apparatus in which a transport unit that transports a sheet is opened in a direction away from a transport position, 1 when the transport unit is removed from the transport position in conjunction with movement of an opening door that opens and closes the transport unit, the transport An image forming apparatus characterized in that the opening/closing door is provided with an elastic means for swinging the unit and an elastic means for balancing the unit. (2) The image forming apparatus according to claim 1, wherein the transport unit includes a transfer means.