JPH0388670A - Medium processor - Google Patents

Abstract

PURPOSE:To prevent improper printing by providing constitution such that a medium is guided to the second conveying path and fed to the second feed part when a diagonal feed of the medium by a diagonal feed detecting means exceeds a predetermined permissible amount. CONSTITUTION:Paper 10a, received in a cassette 3a, is delivered by rotating a delivery roller 4 and conveyed in a conveying path 5a with a point end of the paper detected by either one sensor S1 or S2, and a detection signal is amplified by a sensor amplifier 15 and fed to a main control part 14 with a timer 12 starting time counting by a command of the main control part 14. When the detection signal of either the other sensor S1 or S2 is not output even when the time is counted by the timer 12 after the preset time, a timeout signal (a) from the timer 12 is fed to the main control part 14. In the main control part 14, a magnet driver 16 is commanded with a gate G actuated to close the conveying path 5a and open a branch conveying path 9a, and the paper 10a is conveyed to the conveying path 9a, to pass through a transcription part 66, and fed out to a reject stacker 11a.

Description

[Detailed Description of the Invention] [) Overview] This invention relates to a media processing device that can reject a fed-out medium that is skewed before performing printing or other processing. The object of the present invention is to provide a media processing device that can prevent processing defects such as oblique printing resulting in printing defects, and a first conveyance device that connects a media storage section and a first delivery section. It has a processing section on the road,
A media processing device that feeds media accumulated and stored in a media storage unit one by one, transports them through a first conveyance path, processes them in a processing unit, and then sends them to a first delivery unit, the media processing device comprising: a skew detection means, which is provided between the medium storage section and the processing section of the first transport path, and detects the skew amount of the medium fed out from the medium storage section or the medium conveyed through the first transport path; A second conveyance path is provided between the skew detection means and the first delivery section, and the second conveyance path is branched from the first transportation path and whose terminal end is connected to the second delivery section. When the amount exceeds a predetermined allowable amount, the medium is guided to the second transport path and sent to the second delivery section.

[Industrial application field]

The present invention relates to a media processing device such as a printer that processes media, and particularly to a media processing device that can reject a fed-out medium that is skewed before performing printing or other processing.

In recent years, various printers have been developed and put into practical use as facsimile machines, computer output terminal devices, etc., and cut sheets are widely used as printing paper in these printers.

When such a printer feeds out cut sheets one by one, the printing paper may run diagonally during feeding or conveyance, resulting in slanted printing and poor printing.Therefore, there is a method to prevent printing defects. desired.

[Prior Art] FIG. 5 illustrates an internal side view of the electrophotographic printing apparatus 1. In the figure, 2a is a cassette loading section, 3 is a cassette, 4 is a feeding roller, 5a is a conveyance path, 6a is a printer section, and 7a is a stacker.

The printer section 6a includes an optical unit 60. Photosensitive drum 61
, static eliminator 62. Cleaner 63. Charger 64. Developing device 65
．． It is composed of a transfer section 66, and a fixing device 67 including a fixing roller R1 and a pressure roller R2.

As shown in FIGS. 6(a) and 6(b), the cassette 3 is set in the cassette mounting section 2a, and the cassette 3 stores printing paper (hereinafter referred to as paper) 10a of a desired size held on a holding plate 30. has been done. Therefore, the cassettes 3 are prepared according to the size of the paper 10a.

The holding plate 30 is urged upward by left and right springs 31a and 31b, and the leading edge of the uppermost sheet 10a slightly engages with left and right engaging claws 32a and 32b provided on the front edge of the cassette 3. In addition, the paper 10a is pressing the feed roller 4. Therefore, when the sheet of paper 10a is fed out by the rotation of the feeding roller 4, the leading edge of the top sheet of paper 10a is disengaged from the engaging claws 32a, 32b.
b engages with the leading edge of the second sheet 10a to prevent double feeding. That is, the engaging claw 32a.

32b has a separator function.

At this time, the elasticity of the left and right springs 3La and 31b and the engagement amount of the engagement claws 32a and 32b are adjusted to be equal so that the paper 10a is not fed out in an oblique direction.

With this configuration, when the power of the apparatus is turned on, the fixing roller R1 of the fixing device 67 reaches a predetermined temperature and becomes ready for printing, and thereafter the temperature is controlled within a temperature range suitable for fixing.

Therefore, based on the print instruction signal, the paper 10a is fed out from the cassette in the direction of arrow A by rotation of the feeding roller 4, and is conveyed along the conveying path 5a to the photosensitive drum 6 of the printer section 6a.
Send downward from 1.

By this time, while the photosensitive drum 61 is rotating, the static eliminator 6
2, cleaned by a cleaner 63, and charged again by a charging section 64.

When the print data is input manually, the photosensitive drum 61 is irradiated with the converted optical data from an optical unit 60 configured with a laser light source or the like. The electrostatic image formed on the photosensitive drum 61 is developed into a toner image in the developing section 65, and then transferred to the transfer section 6.
After being transferred onto the paper 10a at step 6, the fixing roller I? is transferred at fixing device 67. 1 and the pressure roller R2, the toner is heated and pressurized and fixed, and the printed paper 1
0a is discharged to the stacker 7a. A sensor (not shown) detects the feeding of the paper 10a, and if further printing is required, the next paper 10a is fed.

[Problem to be solved by the invention]

According to the above conventional method, the elasticity of the left and right springs that press the holding plate in the cassette upward is balanced so that the paper fed out from the cassette does not move skewly, and the elasticity of the left and right springs that press the holding plate in the cassette upward Although the retention amount of the left and right retention amounts that are retained at the top edge of the cassette is made to be equal, there may be slight deviations in the paper stored in the cassette, or there may be strong adhesion between the edges of the paper. In some cases, the paper may be fed diagonally, and since paper of different sizes is used, both sides are not necessarily guided in the direction of travel, so the paper may be fed out diagonally before reaching the printer section. Depending on the feeding condition of the feed roller, the feed may skew along the way. Therefore, it is difficult to completely prevent skewed feeding, and as shown in Figure 7, if the paper is sent to the printer section with skewed feeding, it will be printed skewed, resulting in poor printing, wasting paper, and requiring reprinting. There is a problem that there is.

SUMMARY OF THE INVENTION An object of the present invention is to provide a medium processing apparatus that can prevent processing defects such as printing defects caused by oblique printing on a medium that is conveyed obliquely.

[Means to solve the problem]

FIG. 1 is a diagram showing the principle configuration of the present invention.

In the figure, 2 is a medium storage section, 5 is a first transport path, 6 is a processing section, 7 is a first delivery section, 10 is a medium, 11 is a second delivery section, 8 is the medium storage section 2 or the first delivery section. It is provided between the medium storage section 2 and the processing section 6 of the first transport path 5, and detects the amount of skew of the medium 10 fed out from the medium storage section 2 or the medium 10 transported through the first transport path 5. A skew detection means 9 is a second conveyance path which is branched from the first conveyance path 5 between the skew detection means 8 and the first delivery section 7 and whose terminal end is connected to the second delivery section 11. be.

Therefore, when the amount of skew of the medium 10 detected by the skew detection means 8 exceeds a predetermined allowable amount, the medium 10 is guided to the second transport path 9 without being processed by the processing section 6 and is Sending section 1
1.

[Operation] The skew detection means 8 detects the amount of skew of the medium 10 fed out from the medium storage section 2 or the medium 10 fed out and conveyed to the first conveyance path 5 .

As a result of the detection, if the amount of skew is within the predetermined allowable amount, the medium (
0 is processed in the processing section 6 and conveyed through the
The data is sent to the sending unit 7.

As a result of detection, if the amount of skew exceeds the predetermined allowable amount, media 1
0 is guided to the second conveyance path 9 without being processed by the processing section 6 and sent to the second sending section 11.

In this way, when the amount of skew of the medium 10 exceeds a predetermined allowable amount, the medium 10 is heli-directed to the second delivery section 11 without being processed, so that it can be reused and processed as it is skewed. This eliminates waste and reprocessing due to poor processing of the medium 10.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 2 to 4. The same reference numerals refer to the same objects throughout the design. In FIG. 2, parts corresponding to those in FIG. 1 are shown surrounded by a dashed line.

FIG. 2 is a configuration diagram of an electrophotographic printing device W1a in which the present invention is applied to the electrophotographic printing device described in the conventional example, in which (a) is an internal side view, (b) is a plan view of main parts, and (C) is a A control block diagram is shown.

As shown in FIGS. 2(all) and (b), a conveyance path 5a between the cassette loading section 2a and the transfer section 66 of the printer section 6a.
, transmission type optical sensors (hereinafter referred to as sensors SL and S2) are provided.The sensors Sl and S2 are arranged at intervals in the width direction of the transport path 5a.

Further, a branch conveyance path 9a branches from the conveyance path 5a between the transfer unit 66 and the fixing device 67, and a gate G is provided at the branch point, and the gate G is normally located in a direction that closes the branch conveyance path 9a. Branch conveyance path 9 according to instructions from main control section 14, which will be described later.
a and close the conveyance path 5a.

At the end of the branch conveyance path 9a, there is a beam
is provided.

FIG. 2 (In C3, the timer 12 is connected to the sensor Sl,
The difference in the detection timing of the leading edge of the paper 10a in S2 is counted up to the time T0 set in the time setting section 13.

That is, when one of the sensors St and S2 detects the leading edge of the paper 10a, it is activated for a set time T. If the other is detected by then, it is reset as being less than the allowable skew amount, and if the other is not detected until the set time T,) is counted, a timeout signal a is transmitted. A time To corresponding to the permissible skew amount is set in advance in the time setting section 13, and this is a permissible time when the conveyance speed is constant.

As shown in FIG. 3, when the sheet 10a is conveyed along the conveyance path 5a in the direction of the arrow, if there is no skew, the leading edge will be at the sensor S1.
．． Although they are detected almost simultaneously in S2, if there is skew, there will be a shift in the detection timing by the sensors Sl and S2, so by counting this over time, the amount of skew can be detected.

14 is the main control unit, 15 is the sensor amplifier, 16 is the magnet driver, 17 is the motor driver, 18 is the printer control unit, MGI, MG2 is the magnet, G is the gate, c is the clutch, the old motor is, and R is the feed roller. shows.

The main control section 14 controls each section to perform feeding, conveyance, and printing of the paper 10a, and further operates the gate G to open the branch conveyance path 9a when the timeout signal a is sent from the timer 12. , the paper 10a is passed through the transfer unit 66 without being printed, sent to the branch conveyance path 9a, and rejected.

Since it has such a tank bottom, the operation will be explained next with reference to the flowchart shown in FIG.

■First, when the fixing device 67 is heated to the appropriate fixing temperature by the electric HoN and becomes ready for printing, the paper 10a stored in the cassette 3a is transferred to the feeding roller 4 by a print command signal.
The rotation causes it to be drawn out in the direction of the arrow. Print data is input to the printer section 6a in parallel.

■The fed paper 10a is conveyed through the conveyance path 5a,
The tip is detected by one of the sensors St and S2, the detection signal is amplified by the sensor amplifier 15 and sent to the main control section 14, and the timer I2 starts counting time according to a command from the main control section 14.

■Next, set time T. When the other of the sensors St and S2 detects the leading edge of the paper 10a and the timer I2 is similarly notified, the timer 12 stops counting and is reset.

(2) After the paper 10a is temporarily stopped just before the printer section 6a, the paper 10a is conveyed in correspondence with the image on the photosensitive drum 61, printed on it, fixed by the fixing device 67, and sent to the stand cuff a. The feeding of the paper 10a is detected by a sensor (not shown), and if further printing is necessary, the next paper 10a is fed.

■Even if the timer 12 counts up to the set time T0, if the detection signal from either sensor Sl or S2 is not output, the timeout signal a is sent from the timer 12 to the main control unit 1.
Sent to 4.

■The main control unit 14 commands the magnet driver 16 to
The gate G is operated to close the conveyance path 5a and open the branch conveyance path 9a, thereby temporarily suspending the printing preparation that had been proceeding in the printer section 6a.

(2) The paper 10a is then conveyed without waiting in front of the printer section 6a, passed through the transfer section 66, conveyed to the branch conveyance path 9a, and sent to the reject stacker lla.

(2) Then, when a sensor (not shown) detects the feeding of the sheet 10a (not shown), the next sheet 10a is fed out.

In this way, when the skew is detected and the skew allowance is exceeded, the paper 10a is rejected without being printed, so defects due to skew printing can be prevented, and paper waste and reprinting efforts are avoided. It can be omitted. Needless to say, rejected paper can be reused.

In the above example, a case was described in which the skew detection means detects the leading edge of the paper by a shift in timing of detection of the leading edge of the paper by a plurality of sensors. Of course, it is also possible to use a method of detecting skew depending on whether or not the values are reversed.

In addition, although the case where the skew detection means is provided in the conveyance path has been explained,
A method may also be adopted in which the sensor is provided in the cassette mounting section and detects the skew feeding at the moment when the paper is fed out.

Furthermore, although the above example describes the case of a laser printer, the present invention can be similarly applied to other printers or electronic copying apparatuses that feed and print cut sheets.

Furthermore, although the case where the processing means is a printer unit has been described, the present invention can be similarly applied to the case of processing such as magnetic recording or perforation on a medium.

[Effects of the Invention] As described above, according to the present invention, the skew amount of the medium fed out from the medium storage section is detected by the skew detection means, and when the skew amount exceeds the allowable skew amount, Since the medium can be guided to a second conveyance path separated from the first conveyance path and then helijected to the second delivery section, printing defects can be prevented, paper wasted, and This has the effect of eliminating the need for reprinting.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the principle of the present invention; Fig. 2 is a block diagram showing an embodiment of the invention; Fig. 3 is an explanatory diagram of the embodiment; Fig. 4 is a flowchart of the embodiment; Fig. 5 is an electronic photograph. FIG. 6 is an internal side view of the printing device, FIG. 6 is a configuration diagram of a cassette loading section, and FIG. 7 is an explanatory diagram of a conventional example. In the figure, 2 is a medium storage section, 2a is a cassette mounting section, 5 is a first conveyance path, 5a is a conveyance path, 6 is a processing section,
6a is a printer section, 7 is a first sending section, 7a is a stacker, 8 is a skew detection means, 9 is a second transport path, 9
a is a branch conveyance path, 10 is a medium, 10a is paper,
11 is a second sending section, 11a is a beam stacker, and 12 is a timer. Figure 9 Atsushi) A composition diagram showing the construction of the 1st floor of the roof with a bent wood and winter sun roof. Figure 2 (1) (b) Flat plan (C) 2 (T02) Transcription section 66 Recommendation diagram of the 10th example of Shimiuri I1 Flow + Yard depth 4 Diagram 4 of the electrophotographic section 4 Internal view of the device (J-side view) Figure 5 (α) Thousand-face grip (b) Side view of the side view

Claims (1)

[Claims] A processing section (6) is provided on the first conveyance path (5) connecting the medium storage section (2) and the first delivery section (7), The media (10) accumulated and stored in the processing section (6) are fed out one by one and transported through the first transport path (5).
), the media processing device sends the media to the first delivery section (7) after processing in the media storage section (2) or the first conveyance path (5).
is provided between the medium storage section (2) and the processing section (6), and the medium (10
) or fed out from the medium storage section (2) and
a skew detection means (8) for detecting the skew amount of the medium (10) conveyed through the conveyance path (5); and between the skew detection means (8) and the first delivery section (7). a second conveyance path (9) that branches off from the first conveyance path (5) at a terminal end thereof and connects to the second delivery section (11), and is detected by the skew detection means (8). media (10)
When the amount of skew exceeds a predetermined allowable amount, the medium (10) is guided to the second conveyance path (9) and the second delivery section (11
).