JP4778393B2 - Continuous recording paper printer - Google Patents

Description

  The present invention relates to a printing apparatus that records an image on a continuous sheet of paper in a long shape, and particularly relates to sheet meandering correction control in the continuous recording sheet printing apparatus.

  FIG. 1 is a schematic configuration diagram of a continuous recording paper printing apparatus. The paper 1 is a long continuous paper, and although not shown, feed holes are formed at regular intervals along the paper transport direction on both edges. The sheet 1 is conveyed by a tractor 2 mainly used for sheet conveyance by an automatic sheet loading function, and a predetermined amount is conveyed by the folding length, the sheet is aligned, and automatic loading (sheet stop) is completed.

  As the reference position for paper meander correction, the position detected by the paper skew sensor 12 mounted at the paper edge at the end of automatic loading is set as the paper edge position, and the print standby state is set.

When a print start signal is transmitted from a host device (not shown), the photosensitive drum 3 rotating in the paper transport direction is charged to a predetermined potential by the charger 4, and the photosensitive drum 3 is irradiated by the irradiation beam of the exposure device 5. an electrostatic latent image is Ru formed thereon. The electrostatic latent image on the photosensitive drum 3 is reversely developed by the developing device 6. The toner image on the rotating photosensitive drum 3 is transferred by the transfer unit 7 to the paper 1 pressed against the photosensitive drum 3 by the retractor 8.

  The sheet 1 on which the toner image has been transferred is conveyed by the tractor 2, and is heated and pressurized and conveyed by the heating roll 9 and the pressure roll 10 that rotate in the closed state, whereby the toner image is fixed on the sheet 1, and then the stacker 11. It is carried out to.

  The edge position of the paper traveling during this series of printing operations is detected by the skew sensor 12 and compared with the paper reference position set after automatic paper loading, the paper meandering amount is calculated, and the pressure roll 10 By controlling the left and right pressing force, the paper meander is corrected.

  However, when an optical transmission sensor is used as a skew sensor, the paper meandering correction reference position is set at the end of automatic loading (paper stopped state), so that the paper floats when the operation stops. As a result, the detection value of the skew sensor 12 may fluctuate. If the fluctuating position is set as a reference position for paper meander correction, correct paper meander correction may not be performed.

  FIG. 2 is an explanatory diagram when the pre-printing unit overlaps the transmission sensor unit. As shown in the figure, when an optical transmission sensor is used for the skew sensor 12, the position of the ink pre-printed on the edge of the paper, which is aligned by automatic loading, overlaps the skew sensor mounting portion. The reference position may be erroneously detected due to the difference in transmittance.

  Also, in the case of paper pre-printed at the edge of the paper, the detection value of the sensor tends to fluctuate even during automatic loading (paper operation), so the reference position setting is not stable There is.

  FIG. 3 is a diagram illustrating fluctuations in the detection value of the transmission sensor due to the preprinting unit and the paper being folded or torn. As shown in the figure, even if the paper has not been printed in advance at the paper edge, the same phenomenon as described above occurs when the paper edge is folded or torn.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a continuous recording paper printing apparatus capable of stably transporting paper by eliminating the above-mentioned drawbacks of the prior art and correctly setting a reference position for paper meander correction.

To achieve the above object, the present onset Ming, the continuous paper printer that prints on a recording paper to be continuously in an elongated shape, one of the recording sheet edges in the sheet width direction perpendicular to the conveying direction of the recording sheet A transmissive sensor is provided so as to face one end, and detects the position of the edge of the one end of the recording paper in the orthogonal direction, and after the recording paper is conveyed by a predetermined amount before starting printing Has an automatic loading function for stopping conveyance and waiting for printing , and the position of the edge in the sheet width direction of the recording sheet is transmitted while a predetermined amount of sheet conveyance is being executed by the automatic loading function. An average value of the edge positions in the paper width direction detected by the transmission sensor is used as a paper reference position in paper meandering correction during printing .

Further, when the detection values detected during the conveyance of the predetermined amount of paper are continuously stored and divided into certain detected ranges, the low detection frequency value is determined from the setting of the reference position. After the exclusion, an average value is obtained to determine a reference position.

Further, a pre-printing section is preliminarily printed on the recording paper, and when the pre-printing sensor detects the pre-printing section during the automatic loading, the detection result is displayed at the paper reference position. It is excluded from setting .

  According to the present invention, it is possible to prevent erroneous detection of a paper meandering correction-related jam caused by erroneous detection of a paper meandering correction reference value. In addition, since the reference position can be set correctly, stable paper conveyance can be realized.

  By simply changing the microprogram without adding mechanical parts, the correct paper meandering correction reference position can be set without being affected by fluctuations in the sensor output value due to paper floating or preprinted parts.

As described above, the paper meander correction reference value is conventionally set using a temporary sensor detection value at the end of automatic loading (when the paper is stopped). lifting, also, due to differences in transmittance in the case where pre-printed portion on the paper edge is overlapped with the sensor detecting unit, the sensor detection value varies, the setting of the reference value is picture from the position to be the original reference There was a thing.

If this fluctuation amount exceeds a certain amount, it is determined that the paper meander correction area has been exceeded, and a paper jam may be erroneously detected.

  In the present invention, the sensor detection value at the end of automatic loading (when the paper is stopped) is detected by monitoring the sensor detection value at a certain distance during automatic paper loading (paper operation) and setting it as a reference value. And the erroneous detection of the reference position when the part printed in advance on the edge of the paper overlaps the sensor detection unit.

  Furthermore, the sensor output value at a certain distance is continuously stored, the detected value is divided into certain certain ranges, and the low detection frequency value is not used for the reference position setting. It is possible to set the reference position by deleting the fluctuation of the detection value due to the pre-printed part and the fluctuation of the sensor detection value due to the folding or tearing of the paper.

  The present invention can prevent erroneous detection of jam by changing the reference position setting method as described above.

  Even when the reference value for paper meandering correction is set based on the detection value during automatic paper loading (paper operation), it is caused by preprinted parts, paper breaks or tears as shown in FIG. With respect to the possibility of adversely affecting the reference position setting due to fluctuations in the detected value, a stable reference position can be set by not using a low detection frequency value for the reference position setting.

It is a schematic block diagram of a continuous printing apparatus. It is explanatory drawing when a preprint part overlaps with a transmission type sensor part. It is a figure showing the fluctuation | variation of the permeation | transmission type | mold sensor detection value by a pre-printing part and a paper fold and tear. It is a figure showing the setting of the reference position by the division | segmentation setting of the detection frequency of a transmission type sensor.

Explanation of symbols

  1 is paper, 2 is a tractor, 3 is a photosensitive drum, 4 is a charger, 5 is an exposure device, 6 is a developing device, 7 is a transfer device, 8 is a retractor, 9 is a heating roll, 10 is a pressure roll, 11 is A stacker table 12 is a skew sensor.

Claims (3)

In a continuous paper printer that prints on long continuous recording paper,
A transmission type that is provided so as to face either one end of both ends of the recording sheet in the sheet width direction orthogonal to the conveyance direction of the recording sheet and detects the position of the edge in the orthogonal direction of one end of the recording sheet With sensors,
After transporting a predetermined amount of the recording sheet before printing starts, and stops feeding, an automatic loading function for the printing standby state, the sheet conveyance of a predetermined amount in the automatic loading function During execution , the position of the edge of the recording paper in the paper width direction is detected by a transmission type sensor,
The average value of the position of the edge of the sheet width direction detected by the transmission type sensor, continuous for paper printing apparatus characterized by a sheet reference position in the paper meandering correction during printing. The detection values detected during the predetermined amount of paper conveyance are continuously stored, and when the detected values are divided into certain predetermined ranges, the low detection frequency values are excluded from the reference position setting. 2. The continuous paper printing paper according to claim 1, wherein the reference position is determined by obtaining an average value. A pre-printing unit is printed in advance on the recording paper, and the transmission sensor detects the pre-printing unit during the automatic loading, and the detection result is set from the setting of the paper reference position. 3. The continuous paper printing apparatus according to claim 2, wherein the continuous paper printing apparatus is excluded .

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