JPH0321977A - Printer - Google Patents

Abstract

PURPOSE:To omit the waste of sheet feeding by a page unit by means of an eject operation and to prevent picture contamination caused by the contamination of a sheet feeding roller by performing flash light emission at the time of a skip operation for positioning perforations. CONSTITUTION:The printer is provided with a flash fixing unit 3. In the skip operation for positioning the perforations of a sheet to be printed at the time of print travelling, it detects the rotation of the sheet feeding roller 5 which is rotated following a sheet and on a following side and emits a light when a sheet presence/absence sensor detects sheet presence at the entrance of the fixing unit 3 and a skip switch is pressed. Then, by performing the flash light emission and skip fixation, the process of travelling and fixing a white sheet per page by the eject operation in case travelling is stopped from difficulty as a result of not assuming perforation positions is omitted. Thus, the contamination of the sheet feeding roller and of image data can be prevented even when the eject operation is insufficiently performed or not performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printing device, and more particularly to a printing device for information processing and output having a fixing device for fusing a toner image with a flash discharge tube.

[Conventional technology]

FIG. 5 shows a conceptual diagram of an electrophotographic printing apparatus for information processing and output having a conventional flash fixing device.

The paper in the paper feed section runs according to the arrow, and the paper onto which the toner image formed on the photoreceptor 1 has been transferred is sent to the fixing device 3a by the tractor unit 2 of the transport section. In the fixing device 3&, the toner image is fixed as a permanent image by the thermal energy of the flash discharge tube 4, and the toner image is delivered to the paper discharge section through the paper feed rollers 5, 6.

Since this printing apparatus performs printing control on a page-by-page basis, it is necessary for the tractor unit 2 to perform page alignment based on perforations, which are page separations of printing paper.

The skip switch, which is moved every 1/6 inch for page alignment, is a switch that is used to send blank pages, and at this time, it is determined that it is unnecessary and the flash is not emitted.

If paper perforations are not guaranteed, that is, if the machine stops immediately after a failure and the page standard shifts with the tractor, ejecting the paper one page at a time while emitting flash light is performed to ensure the print data before the machine stops. Let's do it. This eject switch was used to feed the paper until the printed image passed under the flash discharge tube 4, and the perforations were aligned by a skip operation.

If this eject does not feed the blank paper enough, or if the skip operation is performed directly without the intention of ejecting the paper, unfixed images may pass through the feed rollers 5 and 6, staining the rollers with toner, and contaminating the next print data. Sometimes I put it away.

[Problem to be solved by the invention]

In the above-described conventional printing apparatus, if the paper stops running due to a failure without ensuring the position of the paper perforation, the eject operation generates wasted paper due to blank paper feeding.

If the ejection operation is not performed or is insufficient,
There was a drawback that the paper feed roller was smeared and the print data was smudged. That is, since the present printing apparatus performs printing control on a page-by-page basis, it is necessary to perform page alignment using the tractor unit based on perforations that separate pages of printing paper, and this operation is performed using a skip switch. If a failure occurs and page alignment is performed immediately after stopping, the flash will not be emitted, so unfixed data will pass through the paper feed roller, staining the paper feed roller and staining the print data.

[Means to solve the problem]

The printing device of the present invention detects the rotation of a driven-side paper feed roller that rotates to follow the paper, and a paper presence/absence sensor detects the presence of paper at the entrance of the fixing device, and a flash is emitted when a skip switch is pressed. It has a fixing device.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a conceptual diagram of an embodiment of the present invention, FIG. 2 is a detailed configuration diagram of the buffer arm 9, and FIG. 3 is a paper feed roller 5,
6 and FIG. 4 is a time chart of sensor detection and rollers.

During normal printing 2 1 1. Paper that is printed at 7 mm/sec has a speed of 8 that does not interfere with perforation alignment for the skip operation of perforation alignment. 7 non/s
The non-printed sheet advances with ee, and the skip counter fires 6 flashes each time it advances one inch to perform skip fixing.

This eliminates the waste of feeding paper page by page through ejecting operations, and prevents the image from becoming smeared due to dirt on the paper feeding roller.

The presence or absence of paper is detected by a paper presence detection plate 10 attached to the buffer arm 9 shown in FIG. 2 and a paper presence detection optical sensor l1. That is, by detecting the presence of paper, there is no slack in the paper feed rollers 5, 6 and the tractor unit 2, and
Detects a state where paper is not running out.

Further, the rotation detection plate 7 and the rotation detection optical sensor 8 attached to the paper feed roller 5 on the following side in FIG. 3 detect the rotation of the fuller 5, and detect that the paper is in a running state.

Further, by pressing the skip switch, it is possible to feed the paper without soiling the paper, and to prevent the paper from generating heat due to paper cuts or paper jams.

FIG. 4 is a time chart showing the above operation.

〔Effect of the invention〕

As explained above, the present invention performs flash emission during the skip operation of perforation alignment, so that when the perforation position is not guaranteed and the travel stops due to an obstacle, a blank sheet is run for each page by the eject operation. The fixing process can be omitted and waste paper can be eliminated. This has the effect of preventing stains on the paper feed roller and image data when ejection is insufficient or not performed.

[Brief explanation of drawings]

Figure 1 is a conceptual diagram of an embodiment of the present invention, Figure 2 is a detailed diagram of the buffer arm, Figure 3 is a detailed diagram of the paper feed roller, and Figure 4 is a time chart of sensor detection and rollers. , FIG. 5 is a conceptual diagram of a conventional printing device. 1...Photoconductor, 2...Tractor unit, 3...Fuser, 4...Flash discharge tube, 5...Paper feed Roller, 6... Drive side discharge port-ra, 7... Rotation detection plate, 8...
- Rotation detection optical sensor, 9...Buffer arm, 10...Paper presence detection plate, 11...Paper presence detection optical sensor.

Claims (1)

[Claims] It is characterized by a flash fixing device that detects the rotation of the driven side paper feed roller that rotates to follow the paper, a paper presence sensor at the entrance of the fixing device detects the presence of paper, and emits light when the skip switch is pressed. printing device.