JPH08301480A - Recording paper shortage judging method for printer - Google Patents

Abstract

PURPOSE: To provide a recording paper shortage judging method for a printer whereby a time for detecting a recording paper shortage is shortened to enable a processing speed to improve. CONSTITUTION: Judgement of the shortage of recording paper 3 is performed in a spot where a end part of the recording paper 3 passes through a paper shortage judging position 9, to stop rotating a platen roller 4, so as to end processing paper feed a action in the case of paper shortage. In this way, in the case where the paper is cut, time for conveying the end part of the recording paper 3 from the paper shortage judging position 9 to a printing start position 8 can be shortened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording paper runout judging method for a printing apparatus for judging the recording paper runout of a recording paper conveyed to a printing means.

[0002]

2. Description of the Related Art In recent years, a printing apparatus having an automatic paper feeding function, which feeds recording sheets one by one from a cut sheet feeder to perform printing, has become mainstream.

FIG. 3 is a block diagram showing the state of the conventional printing device before feeding, and FIG. 4 is a block diagram showing the state of the conventional printing device after feeding. In FIGS. 3 and 4, 1 is a cut sheet feeder for setting a recording paper 3 which is a paper on which printing is performed, 2 is a hopper plate, 4 is a platen roller, 5 is a feed roller, 6 is an out-of-paper sensor, 7 Is a print head for printing, and 8 is a print start position.

The operation of the printer constructed as described above will be described with reference to the flowchart of FIG.

First, as shown in FIG. 4, the recording paper 3 set on the cut sheet feeder 1 (step a) is pressed against the platen roller 4 by the hopper plate 2 (step b). The pressed recording paper 3 is fed one by one along the platen roller 4 as the platen roller 4 rotates in the feeding direction (step c). The recording paper 3 passes through the paper-out sensor 6 and passes between the platen roller 4 and the feed roller 5. The rotation of the platen roller 4 is stopped when the leading end of the recording paper 3 passes under the print head 7 (step d) and reaches the print start position 8, and the paper feeding operation is ended (step e). The detection of the paper shortage of the recording paper 3 is performed when the rotation of the platen roller 4 is stopped, and the presence or absence of the recording paper 3 is determined by the paper shortage sensor 6 (step f). If the recording operation is judged to have the recording paper 3 (step g), the recording operation is judged to be absent (step h).

[0006]

However, in the above-mentioned conventional method, the time until the paper feeding operation is completed before the paper out of the recording paper 3 is determined, that is, the recording paper 3 is printed after the paper feeding operation is started. It took a long time to convey to the start position 8. That is, there is a problem in that a long waiting time occurs because the paper feed amount of L ₁ shown in FIG. 4 is required.

The present invention solves the above problems, and an object of the present invention is to provide a recording paper breakage determination method for a printing apparatus, which can shorten the time for recording paper breakage detection.

[0008]

In order to achieve this object, according to the present invention, the leading end of the recording paper reaches a detection means for detecting the recording paper provided on the upstream side of the printing means in the conveying direction of the recording paper. It is determined whether or not the recording paper is detected by the detection means at the time when the conveying means for conveying the time recording paper is driven.

[0009]

With the above arrangement, the present invention can detect a shortage of recording paper within the time when the leading edge of the recording paper reaches the detecting means.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
Will be described with reference to. Here, since the configuration of the printing apparatus according to the embodiment of the present invention is the same as that of the conventional example, the same reference numerals are used and the description thereof is omitted.

The recording paper 3 set on the cut sheet feeder 1 (step i) is pressed against the platen roller 4 by the hopper plate 2 (step j). The pressed recording sheets 3 are fed one by one along the platen roller 4 as the platen roller 4 rotates in the sheet feeding direction (step k). At the time when the leading edge of the fed recording paper 3 passes the paper-out sensor 6, that is, at the paper-out determination position 9 (step 1), the paper out of the recording paper 3 is detected (step m). When the out-of-paper sensor 6 determines that the recording paper 3 is present, the platen roller 4 continues to rotate in the paper feeding direction. The recording paper 3 passes between the platen roller 4 and the feed roller 5, and the recording paper 3
Of the platen roller 4 when the leading end of the sheet has passed the lower portion of the print head 7 and reached the print start position 8 (step n).
Is stopped, the feeding operation is completed (step o), and the printing operation by the print head 7 is started (step p). When the paper-out sensor 6 determines that there is no recording paper 3, the rotation of the platen roller 4 is stopped and the paper feeding operation is terminated (step q).

If the paper out of the recording paper 3 is detected as described above, the recording paper 3 is being fed, that is, the platen roller 4 is in operation.
When the leading edge of the recording paper 3 passes through the paper-out sensor 6 during the rotation of the recording sheet 3, it is determined whether the recording paper 3 is out of paper. It is possible to shorten the time to be conveyed up to, and since the paper feed amount is only L ₂ (= L ₁ −L ₃ ), it is possible to speed up the out-of-paper detection time of the recording paper 3.

[0013]

As described above, the present invention conveys the recording paper for the time when the leading end of the recording paper reaches the detection means for detecting the recording paper provided on the upstream side of the printing means in the conveying direction of the recording paper. By deciding whether or not the recording paper is detected by the detection means at the time of driving the means, it is possible to detect the shortage of the recording paper within the time when the leading edge of the recording paper reaches the detection means. The recording paper is judged to be running out,
When there is no recording paper, the conveying operation can be ended, so that the recording paper out detection time can be shortened and the processing speed can be improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a state after feeding a sheet of a printing apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart of a printing device according to an embodiment of the present invention.

FIG. 3 is a configuration diagram showing a state before paper feeding of a conventional printing device.

FIG. 4 is a configuration diagram showing a state of a conventional printing device after being fed.

FIG. 5 is a flowchart of a conventional printing device.

[Explanation of symbols]

 1 Cut Sheet Feeder 2 Hopper Plate 3 Recording Paper 4 Platen Roller 5 Feed Roller 6 Paper Out Sensor 7 Print Head 8 Printing Start Position 9 Paper Out Judgment Position

Claims (1)

[Claims] 1. A detection means for detecting a recording paper conveyed by a conveying means and printed by a printing means is provided upstream of the printing means in the conveying direction of the recording paper, and a leading end portion of the recording paper reaches the detecting means. A method for determining a recording paper run-out of a printing apparatus, wherein it is determined whether or not a recording paper is detected by the detection means when the conveying means is driven for a time.