JPS625285A - Image forming device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention is directed to, for example, separating the developer (hereinafter referred to as toner) adhering to the recording paper from a fixing roller that fixes the developer (hereinafter referred to as toner) to the recording paper and then being carried out. The present invention relates to an image forming apparatus equipped with a separating claw.

[Technical Background of the Invention and Problems Therewith] In recent years, image forming apparatuses capable of copying recording paper on which information media are recorded have become widely used due to improved processing speed, convenience, and economy.

Conventionally, such an image forming apparatus includes a paper feed section A, an image section B, a transfer section C1, a fixing section, and a paper discharge section E, as shown in FIG.

The paper feed section A includes an upper cassette 2a and a lower cassette 2b that store recording sheets 1a and 1b of a predetermined size and are removable from the main body, and the recording sheets 1a and 1b stored in the upper cassette 2a and the lower cassette 2b. The upper delivery roller 3a and the lower delivery roller 3b transport the recording paper 1 to the main body, respectively, and the recording paper 1 delivered from the upper delivery roller 3a to the lower delivery roller 3b.
It consists of a registration roller 4 that conveys the images a to 1b to the transfer section C.

Also, the II image area line, a document table 6 on which the original 5 to be copied is placed, a lamp 7 that irradiates the original 5 with a predetermined light while scanning the original 5 to be copied, and a lamp 7 that simultaneously scans and copies. A mirror 8.9.10 that receives reflected light from the original document 5 and reflects the light in a predetermined direction, a lens 11 that condenses the light reflected from this mirror 8.9.10, and this lens. The mirror 12 includes a fixed mirror 12 that receives the light collected from the mirror 10 and reflects it to the transfer section C.

Roughly speaking, the transfer section C includes a photosensitive drum 13 that attaches toner to a predetermined position of the recording paper 1a or 1b carried out from the paper feed section A, a charger 14 that charges the photosensitive drum 13, and an image pickup section. A developing device 15 that deposits toner on areas other than the portion where the light incident from B enters the drum 13 and becomes a latent image; and a developing device 15 that deposits toner on areas other than the portion where the light incident from B enters the drum 13 and becomes a latent image; The transfer charger 16 charges the recording paper 1a or 1b with an electric charge so that the recording paper 1a or 1b can be attached to the recording paper 1a or 1b.

Further, in the fixing section, the recording paper 1a or 1b to which the toner is attached by the transfer section C is carried in via the conveyor belt 17, and the toner is transferred to the recording paper 1a or 1b by heat and pressure.
A fixing roller 18 to be fixed on the top and this fixing roller 18
It consists of a separation claw 19 that separates the paper attached to the paper.

Further, the paper ejection section E includes a paper ejection roller 20 for ejecting the recording paper 1a or 1b ejected from the fixing section to the outside from the main body, and a tray 21 for storing the ejected recording paper.

The image forming apparatus configured in this way has an upper cassette 2a.
or the recording paper 1a or 1 stored in the lower cassette 2b
b is conveyed out by the lower delivery rollers 3a or 3b, and conveyed to the transfer section C by the registration rollers 4. In response to this operation, the lamp 7 of the imaging section B scans and irradiates light onto the original 5 to be copied on the original platen 6, and this reflected light is reflected by the mirror 8, 9, 10 and passes through the lens 10. The light is focused, reflected by the fixed mirror 12, and an image is formed on the transfer portion C. Further, the drum 13 is driven to rotate in response to such an operation, and a charger 14 charges the drum 13, and a latent image is formed on the drum 13 by the collected light. The toner is attached from the drum 15, and the recording paper 1a or 1b carried in from the paper feed section A is charged with an electric charge by the transfer charger 16, and the toner is attached from the drum 13 onto the recording paper 1a or 1b. .

This recording paper 1a or 1b is roughly conveyed by the conveyor belt 17.
is conveyed to the fixing section, and the toner adhered to the recording paper 1a or 1b is fixed by the heat and pressure of the fixing roller 18. Then, the recording sheets 1a and 1b are discharged from the fixing section to the paper discharge section E.

Conventionally, in the fixing section of such an image forming apparatus,
Since the recording sheets 1a and 1b are conveyed while adhering to the fixing roller 18, a separating claw 19 is required to separate the recording sheets 1a and 1b from the fixing roller 18.

As shown in FIGS. 7 and 8, such a separation claw 19 has a claw-like tip 19a in contact with the fixing roller 18, and
Fitting holes 19d corresponding to the outer diameter of the support shaft 19G are provided in the base 19b of the separating claw 19 at predetermined intervals on the support shaft 19c disposed parallel to the fixing roller 18.
9d. were fitted to the support shaft 19G.

The support shaft 19G is inserted into holes at both ends of a bracket 19e fixed to the main body so that both ends of the support shaft 19G are supported. Fixation in the axial direction was achieved by attaching an E-ring 19f to the E-ring 19f.

However, if the separation claw 19 fitted to the support shaft 19c has some kind of malfunction and needs to be replaced, the E-ring 1 installed in the E-ring groove carved in the support shaft 19G
9f, and then attach the support shaft 19G to the bracket 19.
Since it is necessary to remove the separation claw 19 from the support shaft 19c after removing the separation claw 19 from the support shaft 19c, a great deal of effort and time is required.

[Object of the Invention] The present invention has been made in response to the above-mentioned circumstances, and it is possible to easily attach and detach the separation claw from the support shaft, and when there is a problem with the separation claw, the separation claw can be easily replaced. The object of the present invention is to provide an image forming apparatus that can perform the following steps.

[Summary of the Invention] In other words, the image forming apparatus of the present invention includes a fixing roller that fixes developer deposited on a recording medium onto the recording medium, and a claw-like tip portion that contacts the fixing roller so that the base portion is fixed onto the recording medium. An image forming apparatus comprising: a plurality of separating claws that are fitted at predetermined intervals to a support shaft disposed parallel to a fixing roller to separate the recording medium attached to the fixing roller;
An engaging portion is provided at the base of the separating claw, and includes an arcuate portion that fits into the support shaft and a cutout portion that guides the support shaft to the arcuate portion, and the engaging portion is fitted onto the support shaft. By combining the separating claws, the separating claws can be easily attached and detached from the support shaft, and when there is a problem with the separating claws, the separating claws can be easily replaced.

[Embodiments of the Invention] Hereinafter, details of embodiments of the present invention will be described based on the drawings.

FIG. 1 is a diagram for explaining one embodiment of the present invention, FIG. 2 is a diagram showing the dimensions of the engaging part of this embodiment, and FIGS. 3, 4, and 5 are variations thereof. It is a figure for explaining.

As shown in FIG. 1, the separation claw 22 of the image forming apparatus of this embodiment has a claw-like tip 22a that can be fitted into the support shaft 23 at a position facing the paper discharge section (not shown). It consists of a base portion 22G provided with an engaging portion 22b having an arcuate notch.

Further, as shown in FIG. 2, the engaging portion 22b has the following relationship: CO≧d>C+, where the tip opening dimension is Go, the back root dimension is C+, and the support shaft dimension is d.

Then, such separation claws 22 are attached to the support shaft 23 at predetermined intervals.
A plurality of support shafts 23 are fitted into the fixing roller 24 and arranged parallel to the fixing roller 24 so that both ends of the support shafts 23 are supported by holes at both ends of a bracket (not shown) fixed to the main body. Insert the E-ring grooves (
Fixation in the axial direction is achieved by attaching an E-ring (not shown) to the E-ring (not shown).

In addition, this separating claw 22 is attached to the fixing roller 24 during use.
The claw-like tip portion 22a is brought into contact with the fixing roller 24, and separates the recording paper that has been carried out and adhered to the fixing roller 24.

In the separation claw 22 of the image forming apparatus of the present embodiment configured as described above, when some kind of malfunction occurs in the separation claw 22 and the separation claw 22 needs to be replaced, the support shaft 23 can be replaced with a bracket (see Fig. It is not necessary to remove the separation claw 22 from the support shaft 23 (not shown), and this can be done by removing the separation claw 22 from the support shaft 23.

Furthermore, the end opening dimension Go of the engaging portion 22b is the support shaft dimension d.
Since it is larger, it can be smoothly attached to the support shaft 23, and since the rear root dimension C+ of the engaging portion 22b is smaller than the support shaft dimension d, it is prevented from being lost from the support shaft 23.

Note that in this embodiment, the engaging portion 22b of the base portion 22C of the separating claw 22 was provided at a position facing the paper ejection portion;
The present invention is not limited to this, and as shown in FIG. 3, the position may be opposite to the fixing roller 24.

Further, the engaging portion 22b of the base 22G of the separation claw 22 is connected to the support shaft 2.
However, as shown in FIG. 4, engaging portions 25b are provided at both ends of the base 25G of the separating claw 25, and as shown in FIG. Using a separation claw holder 26 having protrusions 26a that support both ends of the base 25G of the claw 25, the engaging portion 25b of the base 25G of the separation claw 25 is fitted into the protrusion 26a of the separation claw holder 26, and fixed. A plurality of them may be arranged in parallel with the roller.

[Effects of the Invention] As described above, according to the image forming apparatus of the present invention, an arc-shaped engaging portion having a notch that can fit into the support shaft is provided at the base of the separating claw, and this engaging portion is supported. Since the separation claw is fitted onto the shaft, the separation claw can be easily attached and removed from the support shaft, and if there is a problem with the separation claw, the separation claw can be easily replaced.

[Brief explanation of the drawing]

Fig. 1 is a diagram for explaining one embodiment of the present invention, Fig. 2 is a diagram showing dimensions of the engaging part of this embodiment, and Fig. 3 is a diagram for explaining an embodiment of the present invention.
FIG. 4 and FIG. 5 are diagrams for explaining variations thereof,
FIG. 6 is a diagram for explaining an image forming apparatus, and FIGS. 7 and 8 are diagrams for explaining a conventional example. 22...Separation claw 22a...Claw-shaped tip 22b-...Engaging portion 22G...Base 23...・・Support shaft 24 ・・・・・Fixing roller Applicant: Toshiba Co., Ltd. Patent attorney Suyama Sa - Figure 5

Claims (1)

[Claims] (1) A fixing roller that fixes the developer deposited on the recording medium onto the recording medium, and a support whose claw-like tip is in contact with the fixing roller and whose base is parallel to the fixing roller. In an image forming apparatus comprising a plurality of separation claws that are fitted to a shaft at predetermined intervals to separate the recording medium attached to the fixing roller, a circle that fits on the support shaft is provided at the base of the separation claw. An image forming apparatus characterized in that an engaging part is provided that includes an arc-shaped part and a notch part that guides the support shaft to the arc-shaped part, and the engaging part is fitted to the support shaft.