JPH0447734Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improved technique for a corona discharge device used for separating paper from the surface of a photoreceptor.

[Conventional technology]

The above-mentioned corona discharge device consists of a corona discharge wire stretched inside a shield case for corona discharge, and in order to prevent the leading edge of the paper from entering the shield case, it receives the leading edge of the paper and connects it to the downstream side. A paper guide member is provided at the discharge opening of the shield case.

This paper guide member generally consists of a plurality of rib-like guide parts connected to a plate-like base end part, and the axis of the corona discharge wire in the tension direction is placed on both sides of the corona discharge shield case in the longitudinal direction. The shield case is configured such that the guide portion is pivotably mounted around the shield case and can be freely switched between a paper-intrusion prevention posture in which the guide portion is positioned at the discharge opening of the shield case, and a maintenance-enabled posture in which the discharge opening is opened. Various types of maintenance such as cleaning paper dust and toner that have accumulated inside the device and cleaning and replacing the corona discharge wire can be easily performed.

[The problem that the idea attempts to solve]

However, in the past, because the paper guide member was simply pivotally attached to the shield case, the paper guide member swung due to vibrations when the corona discharge device was inserted into and removed from the device loading section, vibrations of the machine body, etc.
The guide portion sometimes lifted up and damaged the surface of the photoreceptor.

In addition, since the base end portion of the paper guide member is generally long and relatively thin compared to its width, the longitudinal intermediate portion of the base end portion, to which both sides are pivoted, is attached to the body of the machine. If the proximal end portion was not made particularly strong in bending strength, the intermediate portion of the guide portion would lift up and vibrate, possibly damaging the surface of the photoreceptor.

The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide a corona discharge device that eliminates the above-mentioned disadvantages by adding a simple structure.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a corona discharge device in which the guide portion can be freely switched between a posture that prevents paper from entering and a posture that allows maintenance, in which the paper guide member is provided so as to be slidable in the direction of the pivot axis. , one of a locking member and a locked member that can be locked to each other as the paper guide member slides while the guide portion is in a paper-intrusion prevention posture is provided in a longitudinally intermediate portion of the shield case; The paper guide member is characterized in that the other member is provided at the base end portion of the paper guide member, and the paper guide member is prevented from lifting up by locking the two members.

[Effect]

According to the above characteristic configuration, by switching the guide portion to the paper-intrusion prevention posture and sliding the paper guide member, rotation of the paper guide member is prevented, and the longitudinal intermediate portion of the base end portion is shielded. It is fixed to the case and prevents the longitudinal middle part of the proximal end from lifting up.
This prevents the guide portion from lifting up due to sliding of the machine body, etc.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 1 shows an image forming section of an electrostatographic copying machine, in which a charging device 2, an exposure section 3, a developing device 4, a transfer device 5, a paper separating device 6, and a cleaning device 7 are arranged around the photoreceptor 1. is installed.

The paper fed from the paper feed section (not shown) is
A toner image is introduced between the photoreceptor 1 and the transfer device 5 by the conveyance roller 8, and after the toner image formed on the surface of the photoreceptor is transferred, it is electrostatically separated from the surface of the photoreceptor by the paper separation device 6. , and is configured to be transported to a fixing device (not shown) by a belt-type transport device 9.

The transfer device 5 and the paper separation device 6 are integrally assembled, and are slidably engaged with a rail member 10 (not shown) fixed to the main body case side in the lateral direction (direction perpendicular to the plane of the paper in the drawing). is inserted and is biased upwardly by a leaf spring 11 and fixed.

Therefore, this transfer device 5 and paper separation device 6
During maintenance, it can be easily pulled out using the handle 12 shown in FIGS. 2 and 3.

In FIGS. 2 and 3, 13 is a metal shield case for corona discharge that is open at the top, and 14 is a shield case 14 that is connected to the transfer device 5.
It is a metal partition wall that separates the sheet separation device 6 from the sheet separation device 6, and corona discharge wires 15, 16, 16 for transfer and sheet separation are built in and stretched in each portion, respectively. 17, 17 are plugs.

Reference numeral 18 denotes a plate member continuous to the side of the shield case 13, and the upper horizontal portion 18A has a plurality of notches 19 formed at predetermined intervals in the direction in which the corona discharge wire 15 is stretched. , In addition, downward tongue portions 1 are provided on both sides of the corona discharge wire 15 in the tensioning direction.
8B and 18B are connected in a bent manner, one of which has an upward potbelly-shaped hole 20, and the other of which has a circular hole 21 with its axis oriented in the direction in which the corona discharge wire 15 is installed. It is formed by

Reference numeral 22 denotes a paper guide member integrally formed of a relatively soft synthetic resin material, which includes a plate-shaped base end portion 22A and a plurality of rib-shaped paper guide portions 22B protruding approximately horizontally from the base end portion 22A. It consists of...
In addition, as shown in FIG. 5, the base end portion 22
A potbell-shaped pivot shaft 23 with a circular tip that is inserted into the pothole-shaped hole 20 is protrudingly provided on one longitudinal side of A, and a circular pivot shaft 23 that is inserted into the circular hole 21 on the other longitudinal side. A shaft 24 is provided protrudingly.

Then, with the circular pivot shaft 24 engaged in the circular hole 21, the base end portion 22A is slightly bent, and the circular tip of the potbell-shaped pivot shaft 23 is engaged with the potbell-shaped hole 20. By inserting the proximal end portion 2
Both sides of the paper guide member 2A are rotatably attached to both sides of the shield case 13, and as shown in FIG. It is designed to be able to switch between an intrusion prevention posture A and a maintenance possible posture B in which the discharge opening is opened by swinging back and forth about the pivot axis P.

Then, with the guide portion 22B switched to the paper entry prevention posture A, the potbell-shaped hole 2
0 and the potbell-shaped pivot shaft 23 match, so that the base end portion 22A and, in turn, the paper guide member 22 can slide in the direction of the pivot axis P.

Reference numeral 25 denotes a locking member that is connected to the lower surface side of the base end portion 22A in correspondence with the cutout portions 19, and is a locking member that is connected to the lower surface side of the base end portion 22A in correspondence with the notch portions 19, and is a locking member that , and the notch 1
The upper horizontal portion 18A near 9 is used as a locked member, and the locked member 18A is locked with the base end portion 22A, and the base end portion 22A is fixed to the shield case 13 at multiple locations between the pivot joints. I'm starting to let them do it.

That is, when the guide portion 22B is in the paper entry prevention posture A, the base end portion 22A is fixed to the shield case 13, and at the same time, the base end portion 22A is configured to be prevented from floating between the pivot portions. ing.

Reference numeral 26 indicates an engaged portion formed by a rectangular small hole formed in the engaged member 18A corresponding to one of the cutout portions 19, and 27 indicates the engagement of the paper guide member 22 by the engagement of both the members 18A and 25. It is an engaging part that engages with the engaged part 26 in a state where the base end part 22A is fixed to the shield case 13, and both 26, 2
7 makes it impossible for the paper guide member 22 to slide relative to the shield case 13.

Reference numeral 28 denotes an operating portion for releasing the engagement of the engaging portion 27 with the engaged portion 26 by pressing, and is provided on the locking member 25 to which the engaging portion 27 is connected.

According to the above configuration, pressing the operating portion 28 releases the engagement of the engaging portion 27 with the engaged portion 26;
Moreover, by sliding the paper guide member 22 to release the locking of the locking member 25 from the locked member 18A, the guide portion 22B of the paper guide member 22 can be moved into the paper as shown by the imaginary line in FIG. It is possible to switch between the prevention posture A and the maintenance possible posture B shown by a solid line.

On the contrary, switch the paper guide member 22 to the paper entry prevention posture A and slide it,
By locking the engaged member 18A with the engaging member 25 and the base end portion 22A, fixation of the paper guide member 22 to the shield case 13 is achieved, and the longitudinal intermediate portion of the paper guide member 22 and the body of the paper guide member 22 are fixed. This prevents the guide portion 22B from lifting up due to sliding or the like.

[Effect of idea]

As explained above, according to the corona discharge device of the present invention, the base end portion of the paper guide member can be moved into the shield case by a simple operation of sliding the paper guide member with the guide portion switched to the paper-intrusion prevention posture. It can be fixed and reliably prevents the guide part from lifting due to vibrations of the aircraft, etc.
It is possible to eliminate scratches on the surface of the photoreceptor.

Since the fixation point of the proximal end portion of the paper guide member to the shield case is the intermediate portion in the longitudinal direction of the shield case, even if the proximal end portion is structurally flexible, the proximal end portion This prevents the longitudinal middle part of the body from lifting up, which in turn prevents the guide part from lifting up due to vibrations of the machine body, etc., and even without taking measures such as making the base end part resistant to bending. Scratches on the surface of the photoreceptor are effectively prevented.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the image forming section of an electrostatographic copying machine, Fig. 2 is an exploded perspective view of the main parts, Fig. 3 is a plan view of the main parts, Fig. 4 is a vertical cross-sectional side view of the main parts, FIG. 5 and FIG. 6 are explanatory diagrams showing a state in which the proximal end portion is released from being fixed to the shield case and a state in which it is fixed. 13... Shield case, 15... Corona discharge wire, 18A... Locked member, 22... Paper guide member, 22A... Base end portion, 22B... Guide portion, 25... Locking member, 26... ...Engaged portion, 27
...Engagement part, 28...Operation part, A...Paper entry prevention posture, B...Maintenance possible posture, P...
...Pivotal axis.

Claims (1)

[Claims for Utility Model Registration] (1) A paper guide member consisting of a base end portion and a guide portion is rotatable on both longitudinal sides of a corona discharge shield case around an axis in the direction in which the corona discharge wire is stretched. In the corona discharge device, the corona discharge device is configured to be pivotably attached to the paper guide and can be freely switched between a paper-intrusion prevention posture in which the guide portion is positioned at the discharge opening of the shield case and a maintenance-enabled posture in which the discharge opening is opened. A locking member and a cover member are provided to be slidable in the direction of the pivot axis, and lock each other and prevent rotation of the paper guide member as the paper guide member slides when the guide portion is in a paper-intrusion prevention position. One of the locking members is provided at an intermediate portion in the longitudinal direction of the shield case, and the other is provided at the base end portion of the paper guide member, and the lifting of the paper guide member is prevented by the locking of both members. A corona discharge device characterized in that it is configured to cause (2) The locked members are arranged in series with the shield case at a predetermined interval in the sliding direction of the paper guide member, and the locked members are attached to the proximal end as the paper guide member is slid. 2. The corona discharge device according to claim (1), wherein a locking member that locks with the sheet guide member is connected to a base end portion of the paper guide member. (3) Forming an engaged portion in at least one of the locked members, engaging the engaged portion as the paper guide member slides, and disabling the paper guide member from sliding. an engaging part is provided on the locking member, and further an operating part for releasing the engagement of the engaging part with the non-engaging part,
2. The corona discharge device according to claim (2), wherein the engaging portion is provided in a continuous locking member.