JPS62229257A - Image forming device - Google Patents

Abstract

PURPOSE:To make the copy operation impossible to prevent paper jam or the like by making it impossible to close a protective cover of an image forming device if a developing device is not locked. CONSTITUTION:If the developing device omitted in the figure is not completely locked to a part 100 to be set of a device body 1, a protective cover 104 cannot be closed, and movement of an original platen 4 is stopped to make the copy operation impossible. Thus, image defect, paper jam, or the like due to the copy operation with the developing device incompletely locked is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an image forming apparatus in which a mounting means for a developing device mounted on, for example, an electronic copying machine is improved.

(Prior Art) In recent years, in image forming apparatuses such as electronic copying machines, a developing device constituting a developing device is removably mounted in a cassette type to a mounting portion of the main body of the device, and is positioned and locked using an appropriate locking means. After the developing roller is engaged with the gear part of the drive mechanism and the input part is completely connected to the connector, the part to be attached to the main body of the apparatus can be opened and closed with a protective cover. It is served to.

However, such conventional image forming apparatuses are configured such that the protective cover closes even if the developing device is not positioned and locked in a proper position in the mounting portion of the apparatus main body.

(Problem to be Solved by the Invention) Therefore, it is possible to start the copying operation even in the unlocked state where the developing device is not set in the correct position in the attachment part of the main body of the apparatus. However, there were problems such as image defects and paper jams.

The present invention has been made in view of the above circumstances, and its object is to provide an image copying system in which the protective cover does not have to be closed when the developing device is not set in the correct position, making copying impossible. An object of the present invention is to provide a forming device.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a structure in which a developing device constituting a developing device is removably and lockably attached to a mounting portion of an apparatus main body. In the image forming apparatus, the image forming apparatus is provided with a protective cover that can be positioned and mounted in a state where the developing device is in an unlocked state, and a protective cover that can be opened and closed to cover a mounted portion of the device main body. It is structured as follows.

(Function) That is, by having the above configuration, the present invention has the following features:
Since the protective cover will not close unless the developing device is completely locked in the correct position in the installed part of the main body of the device, when this protective cover is open it obstructs the movement of the original unit, thereby preventing the copying operation. This makes it possible to prevent image defects and paper jams.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows the external appearance of an electronic copying apparatus which is an image forming apparatus according to the present invention, and numeral 1 in the figure is the main body of the copying apparatus. A paper feed cassette 2 that can automatically or manually feed paper is installed on the right side of the copying apparatus main body 1, and a paper ejection tray 3 is installed on the left side of the main body 1, and a document (not shown) is placed on the left side. A document table 4 is provided on the upper document placement plate, which is capable of reciprocating in the left and right directions (in the direction of arrow a). Reference numeral 5 in the figure denotes an operation display section provided on the front edge of the upper surface of the copying apparatus main body 1, which is comprised of a display 6, a numeric keypad 7, an exposure setting volume 8, a print key 9, and the like.

Next, the internal mechanism of the copying apparatus main body 1 will be explained with reference to FIG.

In the figure, reference numeral 10 denotes a drum-shaped photoreceptor as an image carrier rotatably supported approximately at the center of the main body 1 of the copying apparatus.
It can be rotated in the direction of the arrow in synchronization with the document table 4 by a drive mechanism (not shown). This photoreceptor 10 is uniformly charged by a charging charger 11, and a document image irradiated by an exposure lamp 12 is imaged on the photoreceptor 10 by a converging light transmission member 13 to form an electrostatic latent image. , a developer (hereinafter referred to as toner) is attached to this electrostatic latent image by a later-described developing device and developed, and the image of this developer (hereinafter referred to as toner image) is transferred to the transfer charger 1.
It is made by sending it to the 4th side.

The transfer charger 14 is formed on copy paper P made of plain paper as a recording paper that is fed from a paper feed cassette 2 that is automatically or manually fed via a paper feed roller 15 and a pair of registration rollers 16 and 16. The toner image is transferred onto the copy paper P. After the transfer, the copy paper P is peeled off from the photoreceptor 10 by a peeling charger 17 using AC corona discharge, passed through a conveyance path 18, and the toner image is melted and fixed by a fixing device 19. 20. On the other hand, the toner remaining on the photoreceptor 10 after the toner image is transferred to the copy paper P and peeled off is cleaned by the cleaning device 21 and static electricity is removed. The lamp 22 lowers the potential on the photoreceptor 10 below a certain level to enable the next copying operation.

As shown in FIGS. 3 and 4, on the upper surface of one side of the main body 1 of the copying apparatus 1 corresponding to the lower surface of the original platen 4, there is provided a photoreceptor 10 which will be described later. A storage space 100 is formed, which serves as a mounting portion of the developing device. At the inner bottom of the storage space 100, there are information such as the gear part of a drive mechanism (not shown), the presence or absence of a developing device, the color detection of the developing device, and the automatic toner. A connector 101, which is a connecting device such as a power supply for a detection or toner replenishment function, is installed, and a support pin 102, which serves as a locking part of a locking means, is protruded and fixed on the inner wall surface of the connector 101, and an opening in the upper part of the connector 101 is installed. On the partial side, a drive control switching mechanism 103 such as a power switch or a door opening/closing detection switch on the copying apparatus main body 1 side and a protective cover 104 are provided so as to be openable and closable. This protective cover 104 includes an operating body 105 that includes the drive control switching mechanism 10 described above.
This operating body 103 is installed at a position corresponding to 3.
The drive control switching machine 1i1103 is opened and opened only when the protective cover 104 is completely closed.

Further, the developing device 30 includes a developing device main body 4o constituting a developing device as shown in detail in FIGS. 5 to 10.

That is, the developing device 30 includes a lower unit 30a and an upper unit 30b, and the lower unit 30a includes a developing mechanism section 31 and a developer stirring section 32.

The developing structure 31 includes a developing roller 33 disposed opposite to the opening 41 in the lower casing 40a of the developing device main body 40, and a developer magnetic brush D' formed on the surface of the developing roller 33. A doctor 35 is provided at the sliding contact portion with the photoreceptor 10, that is, upstream of the development position 34, and regulates the thickness of the developer magnetic brush D'.
It has a thin plate member 36 for leveling the developer magnetic brush D' whose thickness is regulated by. In addition, the developer stirring section 32
are the first and second developer agitating units 3 accommodated in the developer accommodating unit 37 in the upper casing 40b of the phenomenon device main body 40.
8.39.

Further, the current @O-ra 33 is composed of a magnetic roll 33a having five magnetic pole parts, and a rotating sleeve 33b that is fitted onto the magnetic roll 33a and rotates counterclockwise in the figure.

The rotating sleeve 33b is in a so-called "width mode" in which it rotates counterclockwise in the figure to cause the phenomenon to occur, and slides the developer brush D held on its surface in a direction that follows the flow of the photoreceptor 10. By bringing them into contact with each other, sufficient development time is ensured, and the electrostatic latent image formed on the photoreceptor 10 is developed in a high-quality image state.

Further, the upper unit 30b includes an upper casing 40b of the developing device main body 40, a donor hopper 50 that is freely movable 111152 with respect to the upper casing 40b, and a developer concentration detector that detects the concentration on the phenomenon side in the developer storage section 37. 51 (in the case of a color developer, this is installed at a position 51' shown by a two-dot chain line in FIG. 5), and a detection word from this developer concentration detector 51. A replenishment roller 52 incorporated in the toner hopper 51. The structure incorporates a replenishment device drive means 53 and the like that drive the replenishment device as necessary.

Further, as shown in FIGS. 6 and 7, the upper unit 30b has a plurality of screws 54 and 54 attached to the lower unit 30a.
It is fixed through the front side and the rear side is fixed and integrated, and can be lifted through the handle 60 attached to the upper unit 30b. It is now possible to do so.

Further, the developing device 30 configured in this manner is inserted through an opening 140 between the storage chambers for inserting and removing the developing device, which is formed empty on the upper surface side of the copying apparatus main body 1, as shown in FIG. It is configured to be detachable from a mounting portion formed in the main body 1 of the copying apparatus. Note that the opening 100
4-104 can be exposed after sliding the document table 4.

The shaft 33c of the developing row 233 protrudes from both ends of the developing device main body 40.
Both ends are guided and positioned by shaft guide parts (not shown) provided on the front and rear sides of the mounted part.

In addition, on the front side of the lower unit) 30m, there is a main pole 1it that can rotationally displace the magnetic roll 33m of the developing roller 33, as shown in FIG. , 1 adjustment lever 66 is provided so that the position of the magnetic pole facing the phenomenon position 34 can be adjusted.

Further, the toner hopper 50 of the upper unit 30b is of a cartridge type, so that when the toner T runs out, the toner hopper 50 can be replaced.

The hopper guide 67 that supports the toner hopper 50 is removable, and when the hopper guide 67 is removed, the phenomenon-side concentration detector 51 is removed as shown in FIG.
．． The replenishing device driving means 53°, the control board 68, etc. are exposed.

The replenishment device driving means 53 transmits the driving force of the drive gear 70 to the driven gear 72 via the clutch 71, and drives the replenishment roller 52 provided with a gear (not shown) that meshes with the driven gear 72. Further, the drive signal to the clutch 71 is sent in response to a detection signal from the developer concentration detector 51.

Further, as shown in FIG. 10, the phenomenon roller 33. is incorporated in the lower unit 30a. The first and second developer agitating bodies 38 and 39 are configured to move relative to each other via gear groups 73 to 76 that mesh with each other in sequence, and the gear 7
4 rotates in unison with the drive gear 70.

The first developer agitating body 38 has blades 38a attached so as to be externally fitted obliquely to the rotating shaft 38b, and the developer agitator 38 in the developer storage section 37 is moved from the developer roller 33 to the developer roller 33.
It is designed to move back and forth along the axial direction of the shaft.

Further, the second developer agitating body 39 has blades t1%39b, .
is located directly below the toner replenishment lower 7, and when the above-mentioned developing device 30 is installed in the storage space 100, which is the installed portion of the copying apparatus main body 1, As shown in FIG. 11, the handle 60, which is in a tilted state, is raised while being pulled up with both hands, and inserted through the opening of the storage space 100. In this state, as shown in FIG.
0, and allows the handle 60 to be tilted and rotated when the developing device 3o is in the normal and fully installed state;
As a result, the hook portion 60a can engage with the support pin 102 and maintain the locked state, making it impossible to remove it and making it possible to close the protective cover 104. When the hook part 60a of the handle 60 is not in the normal mounting state, the hook part 60a of the handle 60 is attached to the support pin 1.
02 and the steering wheel 60 becomes unable to tilt and rotate.
The handle 6 in the unlocked state of such a locking mechanism
0 rises, the protective cover 104 is made impossible to close and becomes a hindrance to the movement of the document table 4.
In addition to disabling the opening operation of No. 3, it is also possible to prevent the copying apparatus itself from being driven.

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that various modifications can be made without changing the gist of the present invention.6 [Effects of the Invention] As is clear from the above description, According to the present invention, the protective cover does not close unless the developing device is properly attached to the attached part of the apparatus main body and is completely locked. To provide an image forming device which has excellent effects in that a copying operation can be disabled because movement of a table is prevented, and image defects, paper jams, etc., which are conventional, can be prevented. It is something that can be done.

[Brief explanation of drawings]

FIG. 1 is an external perspective view showing an embodiment of an electronic copying apparatus applied as an image forming apparatus according to the present invention, FIG. 2 is a schematic cross-sectional view showing the internal structure, and FIG. 3 is a developing device installed. FIG. 4 is a plan view of the main parts of the mounting section of the apparatus main body, FIG. 5 is a schematic vertical side view of the developing device, and FIG. 6 is a toner hopper. Figure 7 is a perspective view of the main parts of the front side with the toner hopper removed, Figure 8 is an exploded perspective view of the upper unit and lower unit, and Figure 9 is the upper part. FIG. 10 is a perspective view of the lower unit, FIG. 11 is an explanatory view showing a state in which the device main body is attached to a portion to be attached, and FIG. 12 is an explanatory view showing a locked state. 1... Image forming apparatus main body, 4... Original table, 10...
...Image carrier, 30...Developing device, 40...
Developing device (developing device main body), 60...handle (handle)
, 60a... hook part (lock mechanism), 100.
... Mounted part (storage space), 102... Locking part (support bottle), 104... Protective cover. Applicant's representative Patent attorney Takehiko Suzue Figure 8 Figure 4 Figure 5 Figure 6 Figure 8 Figure 9 Figure 10 Procedural amendment, Kao. Showa 6th day, -B1 day

Claims (3)

[Claims] (1) The developing unit constituting the developing device is removably and positioned in a locked state on the attached part of the apparatus main body, and the attached part of the apparatus main body is covered with a protective cover that can be opened and closed. An image forming apparatus characterized in that the protective cover cannot be closed when the developing device is unlocked. (2) The developing device is provided with a handle, and a locking mechanism is provided that can lock the locking portion of the attachment portion of the apparatus main body in conjunction with the tilting and rotation of the handle.
The image forming apparatus described in . (3) The image forming apparatus according to claim 1, wherein the protective cover is provided with an operating body for a switching mechanism for drive control on the apparatus main body side.