JPS5994776A - Magnetic toner recovering device of pressure fixing device - Google Patents

Abstract

PURPOSE:To increase the ability to recover toner without making the shape of a toner receiver which contains recovered toner larger by providing a magnet for toner attraction on the toner receiver. CONSTITUTION:The 1st magnet 7 for preventing the scattering of the recovered toner to the circumference is provided near the tip of the scraper 6 of a magnetic toner recovering device 4 and the 2nd magnet 10 for magnetic toner attraction is provided to the inner part of the toner receiver 9 under the scraper 6. Therefore, the recovered toner falling in the toner receiver 9 is attracted to the inner side, so the toner holding force of the toner receiver 9 increases to reduce the probability that a lump of toner falls on a printing surface, thereby increasing the ability to recover the toner. Consequently, >= about 40,000 copies of record of size A4 are taken without trouble by using the toner receiver 9 of the conventional size.

Description

DETAILED DESCRIPTION OF THE INVENTION σ) Technical Field of the Invention The present invention utilizes magnetic toner to 'fC! The present invention relates to a pressure fixing device for a secondary photographic electrostatic recording device, and particularly to a lid for collecting magnetic toner adhering to a pressure roller.

(2) Background of the technology In a 1C electrophotographic static recording device that uses a one-component developer, a latent image is developed with magnetic toner, and after this is transferred to recording paper, the rainbow magnetic toner is applied to a pressure roller of a pressure fixing device. It is fixed by pressing onto the recording paper. During fixation, magnetic toner on the recording paper may adhere to the pressure roller.

Such magnetic toner adhering to the pressure roller must be reliably collected because it stains the recording paper during fixing and degrades print quality.

(3) Prior Art and Problems In the conventional magnetic toner recovery device for a pressure fixing device, a toner suction magnet is provided on a scraper for scraping off magnetic toner adhering to a pressure roller, and the toner is scraped off below the scraper. This configuration includes a toner receiver that accommodates magnetic toner. Conventional magnetic toner collection devices like this do not have sufficient collection capacity for 5 toners, and only 1 A4 size recording paper can be collected.
When 20,000 to 27,000 tones were used, there was a problem in which toner lumps fell onto the recording paper from the toner tray when the collection capacity was full, staining the printing surface. To increase toner accommodation if
Simply increasing the size of the toner receiver is undesirable in view of the device configuration and the need for miniaturization.

(4) Object of the Invention The present invention has been made in view of the above-mentioned disadvantages of the prior art σ, and an object of the present invention is to provide a magnetic toner collecting device which has an increased toner collecting ability without increasing the shape of the toner receiver.

(51 Structure of the Invention In order to achieve this object, in the present invention, a toner suction magnet is provided on a scraper for scraping off magnetic toner adhering to a pressure roller, and a toner suction magnet is provided below the scraper. In the magnetic toner collecting device of the pressure fixing device, which is equipped with a toner receiver for storing the toner, the toner receiver is further provided with a magnet for attracting the toner.

(6) Embodiment of the Invention The drawing is a sectional view of a magnetic toner collection device according to the invention. The pressure fixing device has a first roller 1. 20th - La 2 and 3
The first roller 1 and the 30th roller 3 are each urged to come into pressure contact with the 20th roller 2, are connected by a drive transmission means (not shown), and rotate in the directions of the arrows. A recording paper (not shown) to be fixed is passed between the first roller 1 and the 20th roller 2 in the downward direction of arrow A with the printed surface facing upward. A magnetic toner recovery device 4 is provided behind the pressure contact portion of the pressure roller 1. This magnetic toner collection spell 4 has a frame 5 made of extruded aluminum material.
There are six scrapers for scraping off the magnetic toner adhering to the surface of the 10th layer, and near the tip of the scraper 6 there is a scraper that attracts the magnetic toner to facilitate its release and scrape it off. A 1ζth first magnet 7 is provided to prevent the magnetic toner from scattering around. The frame seat 5 is further made of felt material 8 impregnated with a small amount of silicone oil.
0-roller 1 to completely clean the surface of the first roller 1. A toner receptacle 9 for accommodating scraped magnetic toner is provided below the scraper 6 and supported by the frame 5. At the back of this toner receiver 9, a magnetic toner attracting member @2 magnet lO is provided.

(7) Effects of the Invention In the magnetic toner collecting device configured as described above, the magnetic toner scraped off by the scraper 6 falls onto the toner receiver 9 and is further attracted to the actual measurement of the toner receiver 9 by the second magnet IO. Therefore, the magnetic toner retention force of the toner receiver 9 increases, and the falling of toner lumps onto the printing surface is reduced. As a result, it has become possible to use more than about 40,000 sorts of A4 size recording paper without causing toner lumps to fall, while keeping the dimensions of the toner receiver 9 the same as the conventional one.

[Brief explanation of the drawing]

The drawing is a sectional view of a magnetic toner collection device according to the present invention. l...First roller, 5...Frame body, 6.
...Scraper, 7...First magnet, 9...Toner receiver, IO...Second magnet. Patent applicant Fujitsu Ltd. Patent agent Akira Aoki Patent attorney Kazuyuki Nishidate 1) Yukio Patent attorney Akira Yamaguchi

Claims (1)

[Claims] 1. Magnetic toner recovery in a pressure fixing device, which is equipped with a toner suction magnet on a scraper for scraping off the magnetic toner adhering to the pressure roller, and a toner receiver below the scraper to accommodate the magnetic toner scraped off. A magnetic toner recovery device for a pressure fixing device, wherein the toner receiver further includes a trap provided with a magnet for attracting toner.