JPH01270065A - Structural body for recording device - Google Patents

Abstract

PURPOSE:To accomplish the maintenance of an electronic unit without detaching an armoring cover by opening the upper main body of every recording device, detaching a paper carrying means such as a carrier guiding plate, etc., which exists in a lower main body upward and taking out electric units such as a power source and a controller, etc., which exist below the above-mentioned means upward. CONSTITUTION:The recording device main body is constituted in a shell-shaped structure where the upper part and the lower part of the recording device can be separated and they can be opened and closed. The carrier guiding plate 30 functioning as a carrying means which carries paper P is arranged in the lower main body side and the carrier guiding plate 30 can be detached from te photosensitive drum 28 of a process cartridge 26 at the time of opening the upper main body to the lower main body. The power source units such as a DC controller substrate 32 and a constant voltage power source 33, etc., are arranged below the carrier guiding plate 30 and the power source units can be detected from the photosensitive drum 26, thereby accomplishing the maintenance of the electric unit without detaching the armoring covers such as a right cover 40 and a left cover 41, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is applied to various recording devices such as copying machines and LBPs, and particularly relates to the arrangement and maintainability of electrical units such as power supply controllers.

[Prior Art] Conventionally, in this type of recording apparatus, electrical units such as a power supply section and a controller section have been arranged in various miscellaneous ways depending on the apparatus, such as the one shown in FIG. 8, for example.

(a) is a perspective view showing the external appearance of the device, and (b) is a top view when the upper body is fully opened.

The electric unit 2, such as the power supply section and the controller section, is located on the right side of the main body.When removing it from the main body for maintenance etc., press the open/close button 6 to open the upper main body l, and then remove the
, 4.5, etc., by removing the exterior cover.

FIG. 9 shows another conventional example in which an electric unit is placed on the upper main body side. This also requires removing the upper exterior cover to perform unit replacement, maintenance, etc.

There have also been various other configurations, such as devices that allow the electrical unit to be attached and detached by removing the exterior cover and sliding the electrical unit to the outside of the main body.

[Problem to be solved by the invention] However, in the above conventional example, when removing the electrical unit from the device body for maintenance etc., in any case, first remove the exterior cover and then remove the electrical unit. Therefore, there were the following problems.

■Space is required to place the exterior cover that is removed during maintenance.

■There is a possibility of scratches or dirt on the exterior cover.

In particular, with regard to the space for placing the exterior cover (■), in small printers, etc., it may occupy as much space as the installation space of the device itself, which is extremely wasteful.

In addition, when installing the exterior cover, service personnel have to worry about making sure the appearance does not look unsightly, such as by adjusting the gaps and steps between the joints of the covers, which can be surprisingly troublesome for service personnel.

[Means for Solving the Problems] In view of the above problems, the present invention makes it possible to maintain the electrical unit without removing the exterior cover. That is, the upper main body is opened, the paper transport means such as the transport guide plate present in the lower main body is removed upwardly, and the electrical units such as the power supply and controller present below are removed upwardly.

[Embodiment] FIG. 1 is a drawing that best represents the features of the present invention, and is a schematic main cross-sectional view of a small-sized laser beam printer.

Briefly explaining the device, the paper P loaded in the paper cassette 20 is fed by the rotation of the pickup roller 21, and the paper P loaded in the paper cassette 20 is fed by the rotation of the pick-up roller 21, and is rotated by the action of the foot roller 22 and the reverse roller 23.
The sheets are separated and conveyed one by one, passing through a guide plate and reaching the nip portion of the pair of registration rollers 24. Here, the advance of the paper P is regulated, forming a loop, and waiting with the leading edge aligned, while the laser scanner unit 2
It is irradiated from 5, passes through the reflecting mirror 27, and passes through the
Process cartridge 2 disclosed in Publication No. 8152, etc.
The registration roller pair rotates in synchronization with the upper part of the image irradiated onto the photosensitive drum 28 of No. 6, and is further conveyed to the transfer section 29.

The laser beam irradiated onto the photosensitive drum is developed with toner by a known electrophotographic process, and the toner image is transferred to paper by corona discharge from the transfer charger 29. The paper onto which the toner image has been transferred is separated from the photosensitive drum and is conveyed to a fixing device 31 through a conveyance guide plate 30 . Here, a voltage-applied neutralization needle 36 is provided near the transfer guide plate to facilitate separation from the drum, and at the same time,
The toner image is strongly attracted to the paper and stabilized. The toner image on the paper is fixed by the fixing device 31, and the paper passes through a U-turn-shaped conveyance guide plate, and is placed with the image side down (referred to as face down) on a paper output tray 37 at the top of the main body by a pair of paper ejection rollers 35. It is discharged and loaded.

Next, the conveyance means in the lower body, which is the basis of the present invention, the arrangement of the electric appliance units, the removal of the units during maintenance, etc. will be described in detail with reference to FIGS. 2 to 7.

FIG. 2 is a schematic sectional view of the upper body when fully opened with respect to the lower body, and FIGS. 3 and 4 are views of the lower body viewed from above.

FIG. 3 is a diagram when the fixing device 31 is removed. FIG. 4 shows a view with the conveyance guide plate 30 also removed. FIG. 5 is a perspective view showing the conveyance guide plate. FIG. 6 is a side view of the conveyance guide plate.

Now, the conveyance guide plate shown in figures f55-6 etc. is, for example, t
= 1. It is made of iron plate of Omen grade which has been bent and drawn. Then, on the transfer section side, there is a t=0. A needle-shaped static elimination needle made of an In+m SUS plate or the like with a sharp tip is attached to an insulating plate made of polycarbonate or the like with both sides sandwiched therebetween.

The static eliminating needle is electrically connected to a high-voltage power source, which will be described later, through electrodes, cables, etc. (not shown), and is configured to be able to apply a high voltage of several thousand volts. The conveyance guide plate is broadly divided into a guide section A for guiding the paper from transfer to fixing, and a section B located below the fixing device.

Portion A has an inclination and several ribs along the traveling direction to smoothly guide the paper carrying the unfixed toner image on the fixing device. The cross section of the rib has a shape as shown in FIG. 7, and is drawn to a height of 1 ms and a width of about 21 mm, for example, to reduce the contact resistance with the paper.

Next, part B located at the bottom of the fixing unit is a kind of cover to prevent water vapor, rarely water droplets, etc. generated in the fixing unit from leaking to the electrical unit located below. Since water vapor is particularly likely to be generated downstream of the pair of fixing rollers, the three end faces are raised up as shown in Figure 5, and the two downstream corners are squeezed or welded to eliminate gaps.

Now, below the above-mentioned conveyance guide plate, there is an AC power input section 3 to which the power cord is connected and which supplies AC input to the main body of the apparatus.
4, a low voltage power supply 33 that supplies DC to the entire device, and a charging,
A high-voltage power supply 39 for operating electrophotographic processes such as a developing bias and a DC controller board 32 for controlling the entire apparatus are arranged as shown. That is, below the conveyance guide plate B, an AC power input section is integrated with the conveyance guide by screws, and a low voltage power source and a high voltage power source are fixed to the bottom plate 38 by screws. Furthermore, the DC controller board is fixed to the bottom plate, and the three units of the AC power input section, high voltage power supply, and low voltage power supply are directly connected to the DC controller board through connectors without using the east line.

The unit arrangement has been described above, and next, the removal of the unit during maintenance will be described in detail.

First, as shown in the second diagram, the upper main body is fully opened and the fixing device is removed (as shown in the third diagram). The fixing device is fixed together with the conveyance guide plate B portion by screws to taps provided on left and right fixing fixing plates 42 and 43 fixed to left and right side plates 48 and 49 of the main body.

Further, a fixing connector for supplying power to the fixing heater, etc. is directly connected to a connector 44 of a power input section located directly below.

Next, remove the screws fixed to the left and right fixing plates 45 and 46 of the conveyance guide, and remove the conveyance guide plate 30. At this time, since the AC\L source input section is integrated as described above, it is removed at the same time.

Now the state shown in Figure 4 is reached, and since the high-voltage power supply, low-voltage power supply, and DC controller are each fixed to the bottom plate, it is possible to remove the necessary units for maintenance as appropriate.

By adopting the configuration as explained above, various advantages can be mentioned as follows.

■Since the electric unit can be removed without removing the exterior covers such as the right cover 40 and left cover 41, it saves space during mincing and also prevents scratches on the exterior cover.
It is possible to prevent the occurrence of dirt, etc.

■Since the area directly above the power supply section is covered with a sheet metal transport guide, fire safety is extremely high in the event of a capacitor ignition.

For the same reason as ■■, it has high noise resistance and electromagnetic shielding against radiated noise, electrostatic noise, etc.

For the same reason as described in ■■, especially when integrated with the conveyance guide plate, the conveyance guide plate also functions as a heat sink.

[Other Embodiments] In the above-mentioned embodiments, the conveyance guide plate was extended to the bottom of the fixing unit, but it is not necessary to do so, and the conveyance guide plate can be installed at the bottom without taking the trouble of setting it as a component. A part of the electric unit, for example a heat sink, may be used as a guide for conveyance, or the conveyance means and a plurality of electric units may be integrated.

Furthermore, even if it is disposed in the upper main body, as shown in Figure 1O, in the complete opposite manner to the previous embodiment, maintenance can be performed without removing the exterior cover.

That is, for example, the main body structure is like the one shown in Fig. 1 with the top and bottom reversed, with the electrophotographic processing section located in the lower main body, the transfer section 56, the conveying section 52, the electrical equipment section 51, etc. being arranged in the upper main body, and the paper is placed on the back side. This is a type of device in which a toner image is transferred, transported, and fixed.

In this case as well, by opening the upper main body and removing the conveyance section, upper fixing unit, etc., the electrical component 51 can be easily replaced and maintained without having to remove the exterior cover, etc., and almost the same effect as the above-mentioned embodiment can be obtained. It is.

[Effects of the Invention] As described above, by arranging the electric unit below the conveying means of the lower main body, the following effects can be obtained.

■There is no need to remove the exterior cover during maintenance of the electrical unit; it is relatively easy to do by simply opening the upper body and removing the transport means upwards, and in the past, space was required to place the removed exterior cover. This eliminates this and greatly saves space.

■If the main part of the conveyance means is made of metal, it is possible to improve fire safety, electrical noise resistance, electromagnetic shielding, etc., without providing any other special means.

It can also be expected to be quite effective as a heat sink.

[Brief explanation of the drawing]

FIG. 1 is a schematic main sectional view of a small laser printer embodying the present invention. FIG. 2 is a diagram showing the upper body fully opened. FIGS. 3 and 4 are views of the lower body viewed from above, showing the arrangement of electrical units, etc. FIGS. 5 to 7 show the shape of the conveyance guide plate, etc., and FIG. 51O shows another embodiment of the present invention. In fig. Reference numeral 30 indicates a conveyance guide plate 31, a fixing device 32, a DC controller board 33, a low voltage power source 34, an AC power input section 39, a high voltage power source 40, a right cover 41, and a left cover.

Claims (1)

[Claims] (1) In a recording device having a so-called shell structure in which the device body is divided into an upper part and a lower part and can be opened and closed, the recording device has a conveying means for conveying paper to at least the lower body side,
When the upper body is opened relative to the lower body, the conveyance means can be easily removed, and at least one electric unit such as a power supply unit and a controller is disposed below the conveyance means. A structure of a recording device characterized in that an electric unit can also be removed for information purposes.