JPS6363450B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for correcting paper skew when inserting paper into a recording section of a recording apparatus.

Generally, in a recording apparatus such as a printer, when paper to be recorded is conveyed to a recording section, it may be conveyed with oblique feeding, or so-called skew. This tendency is particularly strong when paper is manually fed.

Conventionally, in order to prevent skew, guides have been provided at both ends of the paper insertion tray.

However, it is troublesome to adjust the guide correctly each time depending on the paper size, and if the guide adjustment is not accurate, skew occurs and normal recording is not possible.

The present invention has been made in order to eliminate the above-mentioned defects, and a plurality of recording paper detectors are provided close to the feed roll that conveys the recording paper. An object of the present invention is to provide a recording medium skew correction device that detects and corrects skew of a recording medium.

The present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an embodiment in which the present invention is applied to a thermal recording device.

Reference numeral 1 denotes a supply roll for an ink donor film for thermal recording, and an ink donor film 2 is wound around this supply roll 1 and is successively wound onto a winding roll 3.

The ink donor film 2 is a film having a base coated with heat-fusible ink, and the heat-fusible ink is transferred onto the paper by placing a sheet of paper thereon and heating it from the back side with a recording head. On the path of the ink donor film 2, a thermal recording head 4 is provided in the opposite direction to the surface on which the hot-melt ink is applied, and a back roll 5 is provided on the ink application surface side to heat the ink donor film 3. The recording head 4 is held between the recording head 4 and a back roll 5, and the back roll 5 is driven by a drive roll 6 in contact with it. Reference numeral 7 denotes a toilet for inserting recording paper, and a pair of feed rolls 8 and 19 are provided at the tip of the toilet, and a tray 7
The recording paper 10 that is manually inserted along is conveyed by feed rolls 8 and 9. The contact pressure between feed rolls 8 and 9 is relatively small;
When a strong force is applied to the recording paper 10 from another source, the recording paper is made to move according to the force. A pair of feed rolls 11 and 12 are further provided below the feed rolls 8 and 9 and in the conveyance direction of the recording paper 10, and the recording paper 10 is conveyed between the ink donor film 2 and the back roll 5 by the feed rolls 11 and 12. do it like this. As shown in FIG. 2, the feed rolls 11 and 12 are each divided into three parts to form a pair, and photo sensors 13 and 14 are arranged in the divided spaces. This photo sensor 1
The signals No. 3 and 14 are input to the timing controller 15 as shown in FIG. 3, and the arrival time difference is detected, and if the magnitude is larger than a predetermined magnitude, it is determined that there is a skew. Furthermore, photo sensor 1
The order in which the output signals 3 and 14 arrive is determined, and the left and right feeder drivers 16,
A predetermined signal is output to each of 17. For example, if the time difference between the output signals of the left sensor 13 and the right sensor 14 is greater than a certain value and the signal from the left sensor 13 arrives first, then the timing controller 15
determines that the recording paper 10 is skewed clockwise and drives the right feeder driver 17. Reference numeral 18 denotes a drive motor provided at the bottom of the recording apparatus, and the drive motor is configured so that its power is transmitted to the take-up roll 3, feed roll 8, feed roll 11, and drive roll 6, respectively.

The operation of one embodiment of the present invention constructed as described above will be described below.

Now, when the recording paper 10 is manually inserted from the tray 7, the recording paper 10 reaches the vicinity of the contact portion of the feed rolls 11 and 12 conveyed by the feed rolls 8 and 9. At this time, assuming that the recording paper 10 is not skewed, the photo sensors 13 and 14 detect the recording paper 10 almost simultaneously, and this signal is the third signal.
The timing controller 15 in the figure determines that the feeding is normal, and the left and right feeder drivers 16,1
Drive 7. This drive output causes the left and right feed rolls 11 and 12 to rotate simultaneously, and the recording paper 10 is fed between the ink donor film 2 and the back roll 5. The recording paper 10 is conveyed by a back roll 5 driven by a drive roll 6, overlapping the ink donor film 2. The ink donor film 2 is supplied with heat according to the recording signal by the thermal recording head 4, and the heat-melting ink in that area is transferred onto the surface of the recording paper 10. Thereafter, the recording paper 10 and the ink donor film 2 are separated, and the recording paper 10 is discharged from the upper exit of the apparatus, while the ink donor film 2 is wound onto the take-up roll 3.

If the recording paper 10 is conveyed in a skewed manner, the photo sensors 13 and 14 simultaneously
cannot be detected. If the recording paper 10 rotates to the right, that is, skews clockwise, the photo sensor 13 detects the recording paper 10 first, and the photo sensor 14 detects the recording paper 10 with a delay depending on the degree of skew. At this time, since the output of the photo sensor 13 has arrived first, the timing controller 15 determines that the recording paper 10 is skewed in the right rotation direction, and
The degree of skew is determined from the delay of the signal from 4. Then, the output signal is supplied to the right feeder driver 17 a predetermined time corresponding to this signal difference, and then the output signal is also supplied to the left feeder driver 16. As a result, the skew of the recording paper 10 is corrected, and the recording operation as described above is performed.
If the recording paper 10 is skewed in the counterclockwise direction,
The recording paper 10 is corrected in the right direction by an operation completely opposite to this.

In this embodiment, an example was shown in which when a certain amount of skew is detected, the skew is corrected and conveyed, but an instruction to reset the recording paper 10 is issued without performing the correction operation. Alternatively, the feed roll may be reversed and returned to the tray.

Furthermore, in this embodiment, the feed roll is divided and each performs a different operation, but the invention is not necessarily limited to this, and when the recording paper is returned to the tray as described above, There is no need for division.

As described above, according to the present invention, since skew of recording paper is accurately detected and corrected, it has a significant effect on improving the reliability of the recording apparatus.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention, FIG. 2 is a configuration diagram showing details of the feed roll section in FIG. 1,
FIG. 3 is a circuit diagram of the embodiment of FIG. 1. 1... Ink donor film supply roll, 2...
...ink donor film, 4...thermal recording head,
5... Back roll, 11, 12... Feed roll, 13, 14... Photo sensor, 15... Timing controller, 16... Left feeder driver, 17... Right feeder driver.

Claims (1)

[Claims] 1 At least two recording medium detectors installed at a distance from each other when feeding a recording medium such as paper into the storage section of a recording device, and each of these recording medium detectors detecting the leading edge of the recording medium. A skew determination circuit that determines the skew of the recording medium based on the time difference, and a skew determination circuit that is arranged at a predetermined interval in a direction substantially perpendicular to the conveyance direction of the recording medium and that changes the drive start timing depending on the direction and degree of skew. A skew correction device comprising: two conveyance rollers driven at the same conveyance speed.