JPS58166362A - Supporting device of recording head of electrostatic recorder - Google Patents

Abstract

PURPOSE:To maintain the spacing between an electrostatic recording head and an image carrying drum constant by making a turning member which supports said head so as to have a specified distance from said drum turnable around a shaft intersecting orthogonally with the drum shaft. CONSTITUTION:The surface 21b of an image carrying drum 21 which is uniformly electrified is destaticized selectively according to an image signal by an electrostatic recording head 23. The electrostatic latent image formed in such a way is developed with a toner and the toner image is transferred on transfer paper. Since the head 23 turns around the shaft of a turning member 36, the head is easy to inspect, and the spacing from the drum surface 21b is maintained constant by a roll 35. The head 23 is turnable around the shaft 37 while the center of the member 36 intersects orthogonally with the drum shaft; therefore, the position from the surface 21b is maintained exactly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support device for a recording head in an electrostatic recording device that forms an electrostatic latent image on a latent image carrier drum using a multi-needle electrode head or an optical fiber tube◇Generally As one type of image information recording device, there is a so-called electrostatic recording device that forms an electrostatic latent image on the surface of a latent image carrier drum using a multi-needle electrode head or an optical fiber tube (hereinafter abbreviated as recording head). Conventionally, in this type of recording apparatus, it is necessary to provide an appropriate gap between the latent image carrier drum and the recording head in the recording section, but recording performance such as recording efficiency, recording resolution, contrast, etc. In view of this, generally the gap between the recording head and the latent image bearing drum is at least 10 to
It is necessary to set it to 30/jm.

Moreover, in order to obtain a perfectly uniform and stable image over the entire recording width (for example, A3 or B4 size), the cylindricity of the latent image bearing drum, the straightness at each vertex, and the recording Of course, it is necessary to consider and pursue factors such as surface straightness, flatness, mechanical rigidity, etc., but in addition, under actual recording conditions, how should the latent image carrier drum be adjusted? It is important to set the recording head within the above gap (10 to 30 μm) under conditions of high precision, high maintainability, and high reliability. Many things have been done.

FIGS. 1 and 2 show an example of the most common recording head support device at present.

1 and 2, 1 is a latent image carrier drum, 2 is a support device for the recording head as a whole, 3 is a recording head, 4 is a recording head support base, 6 is a guide roller, 6 is a recording head mounting member, Reference numeral 7 indicates a guide rail, 8 indicates a gap setting roller, 9 indicates a recording device wall plate, arrow A indicates a head sliding direction, and arrow B indicates a recording section gap.

In this recording head support device, a guide roller 6 fixed to the recording head mounting member 6 is provided at a predetermined position on a recording head support pedestal 4 fixed to a recording device wall plate 9, and has a U-shaped cross section. Since the recording head 3 is fixed to the recording head mounting member 6, the rollers are configured to slide on the inner wall surface of the guide rail 7 having a It moves freely in the direction of the arrow in Figure 1. Next, when an electrostatic latent image is formed on the surface of the latent image carrier drum 1 by the recording head 3, a gap setting roller 8 provided on the recording head comes into contact with the surface of the latent image carrier drum. Then, by assembling and adjusting each part, an appropriate recording section gap B is set and latent image forming conditions are set.

Next, an example of another general recording head support device is shown in FIG.

In FIG. 3, 10 is a latent image carrier drum, 11 is a support device for the recording head as a whole, 12 is a recording head, and 13
1 is a recording head support base, 14 is a recording head mounting member, 1
5 is a guide shaft, 16 is a sliding member, 17 is a recording head urging means, 1B is a gap setting roller, 19 is a recording device wall plate, arrow C is a head sliding direction, and D is a recording section gap. There is.

The recording head support device is configured such that a sliding member 16 provided on the recording head mounting member 14 slides on a guide shaft 16 fixed to the recording head support pedestal 13.

Further, the recording head 12 is installed on the recording head mounting member 14, and the head support pedestal 13 is further fixed to the recording apparatus wall plate 19. Therefore, the recording head 12 moves in the direction of arrow C with respect to the latent image carrier drum 10. When an electrostatic latent image is formed on the surface of the latent image carrier drum 1o by the recording head 12, the gap setting roller 18 provided on the recording head is activated by the biasing means 17 on the surface of the latent image carrier drum. By assembling and adjusting each part, an appropriate recording section gap is set and latent image forming conditions are set.

The recording head support device having the above-mentioned structure is a system in which the recording head is slid linearly with respect to the latent image carrier drum to set the recording section gap, and the above purpose can be achieved with a relatively simple device. have.

However, under actual usage conditions, as shown in Figure 1 above,
In the head support device shown in FIG. 2, when the guide roller 6 rolls and slides on the inner wall surface of the guide rail 7, the above-mentioned movement may be hindered due to the dimensional accuracy of the guide rail, mounting accuracy, etc. Usually, the gap between the roller and the guide rail is widened. Therefore, in FIG. 2, since the recording head 3 is loose with respect to the recording head support pedestal 4 fixed to the recording apparatus wall plate 9,
When this device is used to form an electrostatic latent image, mechanical vibrations inside and outside the recording device cause recording unevenness in the recording sub-scanning direction (vertical direction in Figure 2), which is a fatal drawback. be.

Another problem is that dust (developer, dust, etc.) enters the gap between the sliding parts of the guide roller and the guide rail, which worsens the sliding of the recording head against the latent image carrier drum. can't be ignored either.

Furthermore, as shown in FIG. 4, in the recording head support device of the conventional electrostatic recording apparatus as described above, there is a problem in the accuracy of the sliding direction of the recording head with respect to the latent image carrier drum. Rotation shaft 2o of latent image carrier drum
The recording surface parallelism accuracy for the recording head support pedestals 4 and 13 shown in FIGS. 1, 2, 3-A, and 3-B.
This is determined when the recording device is attached to the wall plates 9 and 19.

Therefore, as shown in FIG. 4, when the cylindricity of the latent image carrier drum is poor or when the drum is attached to the rotating shaft 20 at an angle, the gap setting rollers 8 and 18 of the recording head are As shown by arrow E in the figure, the latent image carrier drums 1 and 1o no longer come into contact with the surfaces, and recording malfunctions occur in a wide area centered on the core. Furthermore, in order to address the above-mentioned problems, an extremely high level of processing and assembly precision is required for device component parts such as the recording head support pedestal, recording device wall plate, and guide shaft, leading to an increase in processing and assembly costs. This method has many problems, including an increase in adjustment costs during service maintenance. Therefore, in view of the above-mentioned problems, it is an object of the present invention to have an extremely simple structure, which does not require a high level of machining accuracy for each device component, and which allows for rough assembly without the need for jigs. Under actual recording conditions, high accuracy and high maintainability without the need for advanced adjustment work.

An object of the present invention is to provide a recording head support device for an electrostatic recording device at a low cost, which allows the recording section gap to be easily set under highly reliable conditions.

An embodiment of the present invention will be described in detail below based on the drawings.

FIG. 6 shows a recording head support device of the present invention for an electrostatic recording device, in which the surface of the latent image carrier drum 21 rotated in the direction of the arrow Σ is energized by the charger 22 in the case shown in FIG. +) A recording signal of negative (-) polarity, for example, indicated by reference numeral 26, is supplied to the charged recording head 24 held by the recording head support device 23 from a recording signal generator (not shown), and the latent image is carried. The positive (+) charge on the body drum 21 is removed in response to the recording signal, and an electrostatic latent image is formed on the drum. Next, the developing device 26 causes a developer to adhere to the electrostatic latent image by Coulomb force, thereby forming a visible image. Next, the developer on the latent image carrier drum is transferred by the high-pressure transfer charger 28 onto the surface of the transfer paper 27 fed in the direction of arrow P from a paper feeder (not shown), and the transfer paper 27 is After the developer is transferred, electricity is removed by a paper electricity removal charger 29, and the paper is transported to the transport unit 3o. At this time, 20 to 30% of the developer that was not transferred onto the transfer paper during the transfer remains on the surface of the latent image carrier drum. Furthermore, since an unbalanced residual surface potential is formed due to the charging charger, recording head, high-voltage transfer charger, etc., the remaining developer from the former is cleaned by cleaning group 'P31 to carry the latent image. It is peeled off and removed from the surface of the body drum. Further, the residual surface potential on the surface of the latent image carrier drum is neutralized and neutralized by the static eliminating charger 32, the static eliminating lamp 33, and the like. On the other hand, the transfer paper 27 after the developer transfer is conveyed to a developer fixing unit (not shown) by a conveyance unit moving in the direction of arrow F, and a hard copy is obtained.

In the so-called electrostatic recording apparatus shown in FIG. 6 as described above, the recording head support device according to the present invention is installed in the configuration shown in FIGS. 6 and 7.

That is, FIG. 6, 7-a, and 7-b show a first embodiment of the present invention, in which 21 is a latent image carrier drum, 23 is a supporting device for the recording head as a whole, and 24 is a holding device. 34 is a support member for the recording head, 36 is a gap holding member, 36 is a rotating member, 37 is a swing shaft, and 38 is a wall plate of the electrostatic recording device.

In this configuration, the latent image carrier drum 21 has an optical semiconductor or an electrical insulator 21b formed on a cylindrical conductive member 2Ia, and is moved to a predetermined position on the electrostatic recording device wall plate 38 by a driving means (not shown). Rotatably provided.

Generally, an optical fiber tube is used as the recording head 24 when the latent image carrier drum is made of a semiconductor, and a multi-stylus head is used when it is made of an electrical insulator. Further, the recording head 24 is fixed to a support member 34, and the straightness or flatness of the recording surface 24b of the recording head 24 is formed to be less than □. A gap holding member 36 consisting of a bearing roller is provided at both ends of the support member oo0 34 in the longitudinal direction.
The apex of the bearing roller is fixed on the longitudinal center line of 4a with a recording section gap G provided from the recording surface 24b of the recording head 24.

Further, a swing shaft 37 is fixed to a predetermined position of the support member 34, and the swing shaft 37 is provided so as to be rotatable about a predetermined position of the rotation member 36. Further, the rotating member 36 is rotatably installed at a predetermined position on the electrostatic recording device wall plate 38 substantially parallel to the axis of the latent image carrier drum 21 .

Therefore, the recording head 24 is rotatable relative to the rotating member 36 in the directions of arrows H in FIGS. It is rotatable in the direction of the arrow in the figures and 7-A and 7-B.

Now, when a recording operation is performed using the recording head support mechanism of the present invention described above, for example, as described above, if the cylindricity of the latent image carrier drum is poor as shown in FIG. Even if the drum is installed at an angle with respect to the rotating shaft,
As shown in FIG. Even if the assembly and adjustment of each component part is relatively rough, there is a wide range of recording errors caused by the uneven contact between the recording head and the surface of the latent image carrier as described above. It has the characteristic of being resolved.

Furthermore, as shown in FIG. 6, the recording head 24 can be released to any desired position around the rotating member 36, for example, as shown by the two-dot chain line in the figure, so maintenance of the recording surface 24b of the recording head 24 is easy. It's extremely easy to do.

Furthermore, since the recording head comes into contact with and releases from the latent image carrier drum by rotating and swinging rather than by linear movement, it is easy to take measures to prevent foreign matter from entering the rotating and swinging parts, resulting in extremely reliable Highly smooth motion can be obtained.

Furthermore, each mechanical element does not require a high degree of processing precision, and since it has a simple structure and a small number of parts, it has many features such as being able to be implemented at a much lower cost than conventional examples.

Next, another embodiment of the recording head support device according to the present invention will be described with reference to FIG. 8 and FIG. 9. 8-Ear 8-B and FIG. 9, 39 is a rolling member, 4o is a regulating member, 41 is a biasing member, 42 is a holding member that holds the biasing member, and the arrow ■ indicates the sub-scan of the recording head. Arrows W each indicate the direction in which the recording head is held down.

In the embodiment described above, the biasing member 41 provided on the swing shaft 37 causes the support member 34 to move in the direction shown by the arrow W in the figure through the roller member 39 and the rotation member 3
In particular, the recording head 24
When the recording width indicated by L is large (for example, A2, A
1 size, etc.), the play in the sub-scanning direction around the swing axis near both longitudinal ends of the recording head is completely eliminated.Furthermore, the regulating member 4o The support member 3 of the rolling member 39 is
4 and the rotation range on the rotation member 36 is the 8th-ear 8
- By being regulated within the range indicated by S in the figure, when the recording head is released, the head rotates more than necessary, which interferes with the operation of other process units in the recording apparatus. It also plays a role in preventing this.

Therefore, in this embodiment, the recording head 24 mounted on the support member 34 is pushed against the rotation member 36 via the rolling member 39 by the urging member 41 provided on the swing shaft 37. This makes it extremely smooth and easy to maintain under actual recording conditions.
A stable and reliable recording section gap setting operation can be obtained.

As described above, according to the present invention, the uneven contact phenomenon of the recording head against the surface of the latent image carrier can be eliminated, and recording malfunctions can be eliminated.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a conventional recording head support device, a side view and a front view of some parts of the conventional recording head support device, and FIG. 4 is a conventional recording head support device showing a partial contact phenomenon. and FIG. 6 is a front view of a main part of a partial cross-section of a latent image carrier drum, and FIG. Partially cross-sectional front view and front view of the recording head support device when the recording head and the latent image carrier drum are in contact with each other, No. 4--4
=〒1-drop 1bi1 Front view of a recording head support device according to another embodiment of the present invention as seen from the latent image carrier drum side, and a diagram showing the contact between the recording head and the latent image carrier drum. FIG. 9 is a front view of the support device for the recording head when the recording head is in the state shown in FIG. 1.10,21...Latent image carrier drum, 2,1
1... Conventional recording head support mechanism, 3, 12,
24... Recording head, 4, 13... Recording head support pedestal, 5... Guide roller, 6
, 14...recording head mounting member, 7...
・Guide rail, 8, 18... Gap setting roller, 9, 19... Recording device wall plate, 15...
...Guide shaft, 16...Sliding member, 17...
...Biasing means, 20...Drum rotation shaft, 22
...Charger, 23... Recording head support mechanism according to the present invention, 26... Recording signal, 26... Developing device, 27...・Transfer paper, 28...High pressure transfer charger,) JI1
9...Paper static elimination charger, 30...
Conveyor knit, 31...Cleaning device, 3
2... Static elimination charger, 33... Static elimination u/p, 34... Support member, 36...
・Gap holding member, 36...Rotating member, 37...
... Swing axis, 38 ... Electrostatic recording device wall plate,
21a... Conductive member, 21b... Optical semiconductor or electrical insulator, 24b... Recording surface, 2
4a... Recording electrode section, 39... Rolling member, 4o... Regulating member, 41...
Biasing member, 42... Name of holding member/agent
Patent attorney Toshio Nakao and 1 other person 111m 2nd! I $113 Figure (b) @ 4 m 5th floor! 4 2.5 Figure 6

Claims (1)

[Claims] 0) a recording head having a recording surface for forming an electrostatic latent image;
a latent image carrier drum having a surface for an electrostatic latent image formed on the recording head, facing the recording surface of the recording head with a predetermined gap and rotatably provided; a gap retaining member provided on the support member so as to have a gap between the recording surface of the recording head and the latent image carrier drum; a swing shaft provided substantially perpendicular to the axial center of the recording head and at the center of the recording surface of the recording head; A recording head support device for an electrostatic recording device that includes a rotating member that is provided to rotate in parallel with an axis. (1) When the support member rotates about a predetermined position on the rotation member, a rolling member and a regulating member for regulating the rotation range of the rolling member are provided at predetermined positions on both longitudinal sides of the support member; A recording head support device for an electrostatic recording device according to claim 1, wherein a biasing member is provided on the swing shaft so that the support member is pressed against the rotating member via the rolling member.