JPS63107578A - Feed unit supporting method of printer recording head - Google Patents

Abstract

PURPOSE:To remove the occurrence of the disorder of an image even though a misregistration occurs between a main unit frame and a unit frame, by a method wherein the layout position of a feed unit is controlled with a unit frame and its relative position to the unit frame is so supported as not to be varied. CONSTITUTION:A unit frame 5 supports a pressure transfer mechanism for contacting a pressure transfer roller 3 with an image carrier drum 1 by pressure and a recording head 9. A feed unit 11 equipped with plenty pin probes 10 for feeding to the recording head 9 is supported with the unit frame 5 by an axis 21. Thereby, even though a positional shift or a temporary deformation due to impact occurs between a main unit frame 7 and the unit frame 5, since the feed unit 11 moves following the unit frame 5, the recording unit 9 is not influenced by the feed unit 11. Therefore, any positional shear never occur between the recording head 9 and the image carrier drum 1 and the disorder of an image is prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for supporting a power supply unit of a recording head in an electrostatic recording printer having a pressure transfer mechanism.

[Conventional technology]

Conventionally, various proposals have been made for electrostatic recording type printers having a pressure transfer mechanism, but the present inventors previously proposed the third patent, (B) in Japanese Patent Application No. 128102/1983.
proposed a printer with the configuration shown in This printer includes an image carrier drum 1 provided with a dielectric layer or a photoreceptor layer on its surface, drum bearing means 2 that rotatably supports both ends of the image carrier drum 1, a pressure transfer roller 3, and a pressure transfer roller 3. A roller bearing means 4 rotatably supports both ends of the pressure transfer roller 3, and the image carrier drum 1 and the pressure transfer roller 3 are held substantially parallel to each other, and the axial distance between the two is freely variable. A unit frame 5 that supports the drum bearing means 2 and the roller bearing means 4 so that the axial distance between them can be varied.
and a pressure transfer roller suspension means 6 for suspending the roller bearing means 4 from the drum bearing means 2, so that the image carrier drum 1 and the pressure transfer roller 3 are brought into contact with each other, so that the pressure transfer can be carried out simultaneously. Configure a fixing mechanism.

The drum bearing means 2 of the pressure transfer and simultaneous fixing mechanism is fitted and supported by the main body frame 7, and the protruding boss 8 provided on the main body frame 7 is fitted into the lower end notch 5a of the unit frame 5. A simultaneous transfer and fixing mechanism is supported by the main body frame 7. A recording head 9 for forming an electrostatic image is mounted on the unit frame 5 so as to face the image carrier drum 1. This recording head 9 is an ion dot projection matrix head (for example, see Japanese Patent Publication No. 57-501348) or a multi-needle electrode head when the image bearing drum 1 is a dielectric drum, and when it is a photosensitive drum. Examples include light emitting diode array heads and liquid crystal matrix heads. Further, a power supply unit 11 having a large number of bin probes 10 for supplying power to the recording head 9 is supported by a shaft 12 on the main body frame 7, and the bin probes 10 are brought into pressure contact with the electrode portion of the recording head 9. ing. A stopper 13 is provided on the shaft 12 to regulate the position of the power supply unit 11 relative to the recording head 9.

As shown in the third diagram, this printer also includes a developing device 15 for developing an electrostatic image formed by the recording head 9 on the image bearing drum 1 into a toner image, and an image bearing drum 1. A paper feed roller 16 for conveying the recording paper 17 to the pressure transfer section between the pressure transfer roller 3 and the pressure transfer roller 3;
a cleaning blade 19 that removes toner remaining on the image carrier drum l without being transferred to the recording paper 17 at the pressure transfer portion between the image carrier drum l and the pressure transfer roller 3; A static eliminator 20 is provided to remove static charges on the image carrier drum 1 in preparation for forming a new static charge image.

In the electrostatic recording printer configured as described above, by suspending the pressure transfer roller bearing means 4 from the image carrier drum bearing means 2, a pressure contact force is created between the image carrier drum 1 and the pressure transfer roller 3. , so that no pressing force is applied to the unit frame 5 or main body frame 7 that support both. Therefore, compared to a system in which the image carrier drum and the pressure transfer roller are supported by support means that directly receive the pressure contact force, the image carrier can be made smaller and lighter, and can have a more compact structure.

[Problem that the invention seeks to solve]

However, in the electrostatic recording type printer configured as described above, the power supply unit 11 equipped with a large number of bottle probes 10 for supplying power to the recording head 9 is supported by the shaft 12 on the main body frame 7. If there is even a slight positional deviation between the frame 7 and the unit frame 5, the recording pad 9 placed on the unit frame 5 may
However, the power supply unit 1 supported on the main body frame 7 side
Due to the pressure contact force of the bottle probe 10 of No. 1, the main body frame 7
This has the disadvantage that the image carrier drum 1 is dragged by the unit frame 5, causing a relative positional shift with respect to the image carrier drum 1 supported by the unit frame 5, which disturbs the image formed on the image carrier drum 1.

This misalignment between the main body frame 7 and the unit frame 5 is mainly caused by the impact when the recording paper 17 enters between the image carrier drum 1 and the pressure transfer roller 3. To prevent this, both frames 5 , 7 had the problem that various reinforcements had to be applied.

The present invention was made in order to solve the problems associated with the electrostatic recording type blink, and provides a printer that does not cause image distortion even if a positional shift occurs between the main body frame and the unit frame. An object of the present invention is to provide a method for supporting a power supply unit of a recording head.

[Means and operations for solving the problems] In order to solve the above problems, the present invention provides an electrostatic recording printer having a pressure transfer mechanism in which a pressure transfer roller is brought into pressure contact with an image bearing drum. The pressure transfer mechanism and a recording head for forming an electrostatic image on the image bearing drum are held in the same unit frame, and a power supply unit having an electrode for supplying power to the recording head is held by the unit frame. It regulates its arrangement position and supports it so that its relative position with respect to the unit frame does not change.

With this configuration, even if a positional shift occurs between the unit frame and the main body frame due to some kind of impact such as recording paper entering, the power supply unit is regulated in position by the unit frame. does not affect the relative positional relationship between the recording head and the image bearing drum, and therefore it is possible to always prevent image disturbance from occurring.

〔Example〕

Examples will be described below. FIG. 18, (B) is a schematic cross-sectional view and a side view of an electrostatic recording printer to which an embodiment of the method for supporting a power supply unit for a printer recording head according to the present invention is applied, and FIG. 8), (B)
Components that are the same as or equivalent to those of the conventional printer shown in FIG.

The method of supporting the power supply unit in this embodiment is as follows:
1 is held on a unit frame 5 by a shaft 21.

By adopting such a support method, even if a positional shift or temporary deformation occurs between the main body frame 7 and the unit frame 5 due to an impact, the power supply unit 1 will not move along with the unit frame 5. The recording head 9 is no longer affected by the power supply unit 1, so that no positional deviation occurs between the recording head 9 and the image carrier drum 1, and the occurrence of image disturbance is prevented.

Figure 2 (Al, +B) is a schematic cross-sectional view and side view of an electrostatic recording printer to which another embodiment of the present invention is applied, which is also shown in Figure 3, (B). Components that are the same or equivalent to those of conventional printers are designated by the same reference numerals. The power feeding unit supporting method of this embodiment is similar to the conventional power feeding unit supporting method shown in FIG. A positioning member in the thrust direction corresponding to the stopper 13 in the conventional example shown in FIG. The power supply unit 11 is positioned and supported by fitting into the provided positioning hole 23.

When such a support method is adopted, the power supply unit 11 is positioned by the unit frame 5 and is not affected by fluctuations in the main body frame 7.
Misalignment between the image bearing drum 1 and the recording head 9 due to misalignment of the unit frame 5 is prevented. Further, according to this support method, since the power supply unit itself is directly attached to the main unit, there is an advantage that the ease of assembly is not impaired.

〔Effect of the invention〕

As described above based on the embodiments, according to the present invention, due to the impact caused by recording paper entering, etc., there may be some damage between the unit frame supporting the image bearing drum and the recording head and the main body frame. Even if positional deviation or temporary deformation occurs, the position of the power supply unit that supplies power to the recording head is regulated by the unit frame, so the relative positional relationship between the recording head and the image carrier drum is maintained constant, and the power supply unit that supplies power to the recording head remains constant. Images without disturbance can be formed.

[Brief explanation of the drawing]

To FIG. 1, ■) is a schematic sectional view and a side view of a printer to which an embodiment of the method for supporting a power supply unit of a printer recording head according to the present invention is applied, a second foreign national. (81 is a schematic cross-sectional view and a side view of a printer to which another embodiment of the present invention is applied, FIG. 3^, (B) is a schematic cross-sectional view and a side view of a printer previously proposed by the present inventors. In the figure, 1 is an image carrier drum, 2 is a drum bearing means, 3 is a pressure transfer roller, 4 is a pressure transfer roller bearing means,
5 is a unit frame, 6 is a suspension means, 7 is a main body frame, 8 is a protruding boss, 9 is a recording head, 10 is a bin probe, 11 is a power supply unit, 12 is a shaft, 13 is a retaining ring, 1
5 is a developing device, 19 is a cleaning blade, 20 is a static eliminator, 21 is a shaft, 22 is a positioning bin, and 23 is a positioning hole.

Claims (1)

[Claims] In an electrostatic recording printer having a pressure transfer mechanism formed by pressing a pressure transfer roller against an image carrier drum, the pressure transfer mechanism and a recording head for forming an electrostatic image on the image carrier drum are provided. are held in the same unit frame, and a power supply unit having an electrode for power supply to the recording head is regulated in its arrangement position by the unit frame, and is supported so that its relative position with respect to the unit frame does not change. A method for supporting the power supply unit of a printer recording head.