JP2007320154A - Printing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a printer capable of making judgment as to whether or not a roll of paper is placed such that the front and rear faces thereof are correctly set. <P>SOLUTION: After a roll of paper is loaded to a roll set shaft, the tip portion of the roll of paper is wound around a roll winding shaft by automatic feeding. After the paper is wound little and the paper becomes in a stable condition, a checkmark adapted to be used for determination of the front or rear face of the paper is detected. This printer is so constituted that when the checkmark is correctly detected, it is determined that the roll of paper is correctly set, and when it is not, it is determined that the roll of paper is not correctly set. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a printing apparatus for printing customer transaction information and the like on a roll of continuous paper, which is built in an automated teller machine (ATM) installed in a financial institution, More specifically, the present invention relates to a printing apparatus having a function of determining whether or not the roll-shaped continuous paper is correctly set.

An automatic teller machine installed in a financial institution or the like has a built-in printing device for printing and recording customer transaction information on a roll-shaped continuous paper (hereinafter referred to as roll paper or paper).
The configuration of the printing apparatus is shown in FIG.

  The printing apparatus includes a roll set shaft 1 that is a feed side of the roll paper 2, a roll take-up shaft 3 that is a roll take-up side, and roll paper 2 that is drawn from the roll set shaft 1 to the roll take-up shaft 3. A guide section (not shown) for guiding is provided, and a staff member of a financial institution loads a new roll paper 2 on the roll set shaft 1, and the leading end of the roll paper 2 is manually passed between the print head 5 and the platen 5b. Further, it is inserted into the guide portion inlet 14. The inserted roll paper 2 is guided by the guide unit and further conveyed (auto-feed) by the rotation of the platen 5b driven by the motor 4. The leading end of the conveyed roll paper 2 is configured to be wound around a roll winding shaft 3. The roll take-up shaft 3 rotates when the power of the stepping motor 4 is transmitted through the belt 6 and the gear 7. In such a printing apparatus, a check mark printed on the roll paper 2 by the print head 5 provided in the apparatus itself or a check mark preliminarily printed on the roll paper 2 is detected by a reflective sensor (sensor b9) such as an infrared sensor. Thus, it is determined whether the front and back of the roll paper 2 are set correctly. Patent Documents 1 and 2 disclose a printing apparatus having such a roll paper front / back determination function.

FIG. 12 shows an example of a paper front / back determination processing flow when paper is loaded in the printing apparatus.
First, in step S1401, an attendant or the like loads the roll paper 2 onto the roll set shaft 1, and in step S1402, the roll paper 2 shields the sensor a8 that is a transmission type sensor, and it is detected that the roll paper has been loaded. The rotation check counter used for the rotation check of the take-up shaft 3 and the paper jam idling check is cleared to zero. Next, the motor 4 is started in S1404, and the roll paper 2 starts to be conveyed by auto feed. In S1405, the rotation of the roll take-up shaft 3 is checked. If there is an abnormality in the rotation of the roll take-up shaft 3, etc. (NG), the process proceeds to S1406, the motor 4 stops, and an error occurs in the staff in S1407. Be notified. If there is no abnormality in the rotation of the roll take-up shaft 3 in S1405 (OK), the process proceeds to S1408, the solenoid 12 for fixing the roll take-up shaft 3 is turned on, and the roll paper 2 moves to the roll take-up shaft 3. The front / back determination processing of S1409 to S1413 is performed as it is conveyed toward the front.

  In the front / back determination process, first, a check mark printing process is started by the print head 5 in step S1409. Then, by detecting the check mark printed in S1410 by the sensor b9, it is determined whether the front and back sides are correctly set. If it is not set correctly (NG), the process proceeds to S1411, where the motor 4 is stopped and the conveyance of the roll paper 2 is stopped by auto feed, and a roll paper setting error is notified in S1412. If the roll paper is correctly set in S1410 (OK), the process proceeds to S1413, the check mark printing process is terminated, and the process proceeds to S1414.

  In S1414, the sensor c10 detects that the leading edge of the sheet has been conveyed to the front of the roll take-up shaft 3, and a lever (not shown) for fixing the roll take-up shaft, which is linked to the solenoid 12 after a certain time, and the roll In step S1415, the motor 4 is stopped to once separate the winding shaft 3, and the motor 4 is reversely rotated in step S1416. Thereafter, in S1417, the solenoid 12 is turned OFF, and the roll take-up shaft 3 is brought into a free state. When the motor 4 is activated in S1418, the roll paper 2 is conveyed in the direction of the roll take-up shaft 3 and taken up. In S1419, it is checked whether there is a paper jam or idling of the roll take-up shaft 3. If there is a paper jam or idling (NG), the motor stops in S1420, and an error is notified to the staff in S1421. The If there is no abnormality such as paper jam or idling in S1419 (OK), the process proceeds to S1422, and the roll paper setting process is terminated.

  As shown in FIG. 12, in the conventional printing apparatus, a check mark is detected before the leading edge of the roll paper is taken up by the roll take-up shaft 3, and it is determined whether or not the front and back sides of the paper are set correctly. It was.

  For this reason, for example, as shown in FIGS. 13 and 14, the check mark must be detected in a state where the behavior of the leading end of the sheet is unstable. That is, in the case of FIG. 13, since the leading edge of the paper is in a free state, the distance between the paper and the sensor cannot be kept constant as the distance between the paper and the sensor b9 becomes shorter or longer. The behavior was unstable and the check mark detection was unstable.

In the case of FIG. 14, the roll paper to be loaded has a small diameter and the paper curl state is tight, so that it is separated from the sensor b9 in the paper path, and the check mark detection is unstable.
In order to cope with the unstable check mark detection, the conventional printing apparatus can detect the check mark more reliably as the sensor b9 for paper front / back determination even if the paper is separated from the sensor b9. We have used good quality sensors where possible. That is, for example, when a reflection type infrared sensor is used as the sensor b9, an infrared sensor having a large output has been selected and used so that the infrared rays can reach a sheet that exists at a distance. However, even if a sensor with good quality is used, the check mark detection may not be stable because the behavior of the paper is not stable. There was a problem of increasing the manufacturing cost.

  By the way, in Patent Document 3, in order to prevent the printing position of the multicolor printed matter, the multicolor printing in which the pre-printed check mark, the rotation position of the conveying roller, and the tension of the paper are detected and the phase shift is controlled by the braking device. An apparatus is disclosed.

If the paper feeding side and the winding side of the roll paper are fixed and tension is applied to the paper as in Patent Document 3, the paper is always in a stable state, and the distance between the sensor and the paper is almost constant. Therefore, the check mark detection on the paper is considered to be stable regardless of the quality of the sensor.
JP 2005-206349 A JP 2002-87672 A JP-A-7-110535

  As described above, when detecting the check mark for determining whether or not the roll paper is correctly set in the conventional printing apparatus, the behavior of the leading edge of the roll paper is unstable, so it is necessary to use a high-quality sensor. As a result, there is a problem that the manufacturing cost of the apparatus increases.

  Accordingly, an object of the present invention is to provide a printing apparatus capable of detecting a check mark on a sheet in a state where the behavior of the roll paper is stable and determining whether or not the front and back of the roll paper are set correctly. is there. Accordingly, the check mark can be detected more reliably, and it is not necessary to limit the sensor used for detecting the check mark to only a high quality sensor, and it is possible to provide a printing apparatus with a lower manufacturing cost. And

  In order to solve the above-described problems, in the present invention, after the roll paper is loaded on the roll set shaft, the leading end of the roll paper is wound around the roll take-up shaft by auto feed, and a small amount of paper is taken up, thereby stabilizing the paper. After reaching this state, a check mark used for front / back determination is detected. That is, when the check mark is correctly detected, it is determined that the roll paper has been set normally. Otherwise, it is determined that the roll paper has not been set normally. With this configuration, the check mark detection for determining whether or not the roll paper has been set correctly is stable regardless of the quality of the sensor, thereby reducing the manufacturing cost of the printing apparatus. It is possible.

  According to one aspect of the present invention, a roll set shaft that is a roll paper supply side and is loaded with roll paper, a roll take-up shaft that is a roll paper take-up side, and a roll supplied from the roll set shaft A printing apparatus comprising a guide unit for guiding paper to the roll take-up shaft and a printing unit for printing on the roll paper, wherein the roll paper newly loaded on the roll set shaft is guided by the guide unit, and After performing the winding process with the roll winding shaft, the front and back of the roll paper are correctly set based on the sensor that detects the check mark used for front / back determination and the detection result of the check mark detected by the sensor. And a control unit for determining whether or not. As a result, the distance between the sensor for detecting the check mark and the sheet can be kept constant at all times, so that the check mark can be detected stably regardless of the quality of the sensor. Therefore, it is not necessary to limit the quality of the sensor used to a good one, and it is possible to reduce the device manufacturing cost.

  According to the present invention, in a printing apparatus having a function of determining whether or not the front and back sides of the paper are correctly set when the roll paper is loaded, a small amount of the paper is wound around the roll take-up shaft and the paper is stretched, that is, the paper Since the check mark is detected and determined in a state where the behavior of is stable, it is possible to make a stable determination. Even when a small-diameter roll paper is loaded, a check mark is detected in a state where the paper is stretched, so that stable determination is possible.

  In the printing apparatus of the present invention, since the distance between the sensor for detecting the check mark and the paper can be kept constant at all times, the check mark can be stably detected regardless of the quality of the sensor. It is not necessary to limit the sensor to be used only with a good quality, and the manufacturing cost of the printing apparatus can be reduced.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows the configuration of a printing apparatus according to an embodiment of the present invention. The same parts as those of the printing apparatus shown in FIG. 11 are denoted by the same reference numerals. Since each part was mentioned above, it abbreviate | omits. There is no significant difference between the arrangement of the printing apparatus according to the embodiment of the present invention and the components of the printing apparatus shown in FIG.

  A major difference between the printing apparatus according to the embodiment of the present invention and the printing apparatus shown in FIG. 11 is that, as shown in FIG. 2, when determining whether the roll paper is correctly set, the roll paper After a small amount is wound on the roll winding shaft 3, a check mark for front / back determination is detected and front / back determination is performed. In FIG. 1, after the roll paper front end is wound on the roll take-up shaft 3, a state is shown in which the sensor b9 which is a reflective sensor makes a determination by irradiation with infrared rays or the like (from the sensor b9 to the roll take-up). Arrow pointing to the paper).

  As described above, in the printing apparatus according to the embodiment of the present invention, when the roll paper is set, the roll paper is wound around the roll take-up shaft 3 in a small amount, that is, the paper is stretched, and the behavior of the paper is stable. In this state, it is possible to detect a check mark and determine whether or not the sheet is normally set. Therefore, the distance between the sensor b9 and the sheet can be always kept constant, and stable determination is possible. . Even when a small-diameter roll is loaded on the roll set shaft 1, a small amount of roll paper can be taken up on the roll take-up shaft 3 and a check mark can be detected while the paper is stretched. Stable check mark detection is possible.

FIG. 3 is a functional block diagram of the printing apparatus shown in FIG.
The main control unit 30 is a main control unit of a schedule processing unit such as an automatic teller machine, and controls each unit of the statement slip processing unit to execute card processing, receipt printing, journal printing processing, etc. Control data communication. Further, based on the detection result from each sensor in the sensor monitoring unit 34, the state of the roll paper, the state of the winding shaft, and the like are determined. The main control unit 30 also determines whether or not the roll paper is correctly set based on the detection result from the front / back detection sensor (sensor b) 9, which will be described in detail later. The printing apparatus is connected to the main control unit 30 which is a part of the statement slip processing unit, receives a control command, and returns a processing result.

The inside of the printing apparatus includes a printing apparatus control unit 31, a roll paper conveyance control unit 32, a print control unit 33, a sensor monitoring unit 34, and an error notification unit 35.
The printing device control unit 31 controls each unit in the printing device. In response to a control command or the like from the main control unit 30, each unit is controlled based on the command.

The roll paper conveyance control unit 32 controls the motor 4 for conveying the roll paper.
The print control unit 33 controls the print head 5 that prints check marks for performing front / back determination, customer transaction information, and the like on roll paper.

  The sensor monitoring unit 34 detects detection results from a roll paper insertion sensor (sensor a) 8, a front / back detection sensor (sensor b) 9, a roll paper conveyance sensor (sensor c) 10, and a take-up shaft rotation sensor (sensor d) 11. Is transmitted to the printer control unit 31.

The error notification unit 35 notifies an attendant or the like of an error in the printing apparatus such as an abnormality in the roll take-up shaft 3, a roll paper front / back set error, a paper jam, or idling by an LED (not shown).
Next, FIG. 4 shows a paper front / back determination processing flow when the paper is loaded in the printing apparatus according to the embodiment of the present invention configured as shown in FIGS.

  First, in S401, an attendant or the like loads the roll paper 2 onto the roll set shaft 1, and when the roll paper is stretched and inserted along the guide portion, the roll paper 2 shields the transmissive sensor a8 in S402. Detected. In step S403, the rotation check counter used for the rotation check of the roll take-up shaft 3 and the paper jam idling check is cleared to zero. Next, in S404, the motor 4 is activated and the roll paper 2 is conveyed by auto feed. In S405, the rotation of the roll take-up shaft 3 is checked (details will be described later). If there is an abnormality in the rotation of the roll take-up shaft 3 or the like (NG), the process proceeds to S406, the motor 4 stops, and S407 An error is notified to the staff. If there is no abnormality in the rotation of the roll take-up shaft 3 in S405 (OK), the process proceeds to S408, where the solenoid 12 is turned on and the roll take-up shaft 3 is fixed. FIG. 5 shows an enlarged view around the roll winding shaft 3. An interlocking lever 13 is attached to the solenoid 12, and when the solenoid 12 is turned on, the roll winding shaft 3 is fixed so as not to rotate by the interlocking lever.

  In step S409, the sensor c10 detects that the front end of the sheet has been conveyed to the front of the roll take-up shaft 3, and after a predetermined time, the lever 13 and the roll interlocked with the solenoid 12 that has fixed the roll take-up shaft 3. In order to release the winding shaft 3 once, the motor 4 is stopped in S410, and the motor 4 is reversely rotated in S411. Thereafter, in S411, the solenoid 12 is turned off, and the roll take-up shaft 3 is brought into a free state. Thereafter, when the motor 4 is started in S413, the roll paper 2 is conveyed in the direction of the roll take-up shaft 3. In step S414, the roll paper 2 is taken up on the roll take-up shaft 3. For example, in S414, winding is performed for about 1000 msec. This eliminates sagging of the roll paper 2.

  After the roll paper 2 is wound on the roll winding shaft 3, the front / back determination processing in S415 to S419 is performed. In the front / back determination process, first, a check mark printing process is started by the print head 5 in S415. Then, the check mark printed in S416 is detected by the sensor b9 to determine whether or not the front and back sides are correctly set. If it is not set correctly (NG), the process proceeds to S417, where the motor 4 is stopped and the conveyance of the roll paper 2 is stopped by auto feed, and a roll paper setting error is notified in S418. If the roll paper is correctly set in S416 (OK), the process proceeds to S419, the check mark printing process is terminated, and the process proceeds to S420.

  In S420, it is checked whether or not there is a paper jam and idling of the roll take-up shaft 3 (details will be described later). If there is a paper jam or idling (NG), the motor stops in S421, and the staff in S422 An error is notified. Therefore, the clerk can put the roll paper set in error in a normal state, and can use the automatic teller machine without stopping it.

If there is no abnormality such as paper jam or idling in S420 (OK), the process proceeds to S423, and the roll paper setting process is terminated.
12 is largely different from the flow at the time of paper loading in the conventional printing apparatus shown in FIG. 12, as described above, a small amount of roll paper is wound around the roll take-up shaft 3 in S414, and the slack of the paper is removed. In the state where the behavior of the paper is stable, the front and back determination processing for determining whether the front and back of the roll paper is correctly set in S415 to S419 is performed. Accordingly, in the embodiment of the present invention, when detecting a check mark for front / back determination, the distance between the sensor and the paper can be always kept constant, and the check mark is not affected by the quality of the sensor. Can be detected stably. That is, it is not necessary to limit the sensor to be used to a high-quality sensor with good detection accuracy, and the manufacturing cost of the printing apparatus can be reduced.

  Now, the winding shaft rotation check at S405 in FIG. 4 and the paper jam idling check at S420 will be described in more detail with reference to FIG. 6, and details of the front / back determination processing in FIG. 4 will be described with reference to FIGS. This will be described in more detail.

  First, regarding the winding shaft rotation check and the paper jam idling check, these checks are performed by referring to a memory that is updated by an interrupt process that is always performed when the motor rotates. This memory is called a check memory. Further, when an abnormal state is detected in the setting operation process (FIG. 4) when the roll paper is loaded, a notification is given to the host system (for example, the main control unit 30).

FIG. 6 shows a flow of interrupt processing performed when the motor rotates.
First, an interrupt is generated in S601, and the motor 4 which is a stepping motor advances one step in S602. As the motor 4 advances by one step, the rotation check counter is incremented by 1 in S603. In step S604, it is determined whether there is a change in the sensor d11 that is the take-up shaft rotation sensor.

  As shown in FIG. 5, the take-up shaft rotation sensor d <b> 11 is a transmission type sensor that monitors slits provided at regular intervals that rotate with the roll take-up shaft 3. When the winding shaft rotates, the slit also rotates and the state of the sensor d11 changes.

    If it is determined in step S604 that the sensor d11 has changed and the process proceeds to step S605, if the rotation check counter is 10 steps or more, the rotation check counter is cleared to 0 in step S609 and the interrupt process is terminated (S611). If it is determined in step S605 that the rotation check counter is 9 steps or less, it is stored in the check memory in step S608 that idling has been detected. In step S610, the rotation check counter is cleared to 0, and the interrupt process is terminated (S611).

  If the sensor d11 does not change in S604 and the process proceeds to S606, if the rotation check counter is 130 steps or more, the fact that a paper jam has been detected is stored in the check memory in S607. Then, the interrupt process ends (S611). If the rotation check counter is less than 130 steps in S606, the interrupt process is terminated as it is (S611).

  As shown in FIG. 6, an interrupt process is performed every time the motor 4 advances one step, and the contents of the check memory are updated when the process advances to S607 and S608. In the winding shaft rotation check in S405 and the paper jam idling check in S420 in FIG. 4, this check memory is referred to and it is determined whether it is NG or OK. That is, in the paper jam idling check in S420, if the paper jam state or idling state is stored in the check memory, the process proceeds to the motor stopping step in S421 as NG. Further, in the winding axis check in S405, it is determined that the paper jam state is stored in the check memory as NG, and the process proceeds to the motor stopping step in S406. In the winding axis check in S405, the purpose is to check whether or not the winding axis is rotating. Therefore, if the idle state is stored in the check memory, it is ignored.

  As described above, the winding shaft rotation check in S405 and the paper jam idling check in S420 in FIG. 4 have been described. Next, the front / back determination processing in S415 to S419 in FIG. 4 will be described.

FIG. 7 shows an outline of the front / back determination processing.
The roll paper used in the present invention is a thermal paper that enables color printing by applying color to only one side (front side) by applying heat, and if it is set to be printed on the back side by mistake, check it. Since the mark is not printed, it is determined that there is no change in the sensor and the back side set.

  In the printing apparatus according to the embodiment of the present invention, as shown in FIG. 7, a plurality of squares are printed at equal intervals, for example, length a as check marks, so that black and white appears repeatedly a plurality of times. If the reflection sensor b9 can detect the combination of white level and black level twice in succession, that is, white → black → white → black or black → white → black → white, it is determined that the surface is set. That is, it is configured not to be performed only by detecting one printed check mark. This is because, for example, when the paper is torn in the middle of the paper, the torn part is detected as a black level, the black level is determined to be due to printing, and it is erroneously determined that the surface is set. It is.

The determination process performed by the main control unit 31 in FIG. 3 will be described with reference to FIGS. 8 to 10, using specific examples when the roll paper is normally set in the conventional apparatus and the apparatus of the present invention.
First, FIG. 8 shows measured values when a check mark is detected by the sensor b9 of the printing apparatus of the present invention. The horizontal axis in FIG. 8 is the number of steps, and the vertical axis is the voltage value. The infrared rays emitted from the sensor b9 are reflected in response to the black portions printed on the paper, and the reflected waves are measured as voltage values. 9 and 10 show measured values when the check mark is detected by the sensor b9 of the conventional printing apparatus.

  When the paper behavior is unstable as in the prior art, when the distance between the sensor b9 and the roll paper is large, the voltage value change of the reflected wave is small as shown in FIGS. . In FIG. 9, since the distance between black and white is not constant and the period between black and white is not constant, the front / back determination cannot be performed. In addition, when the voltage change is small as shown in FIG. 10, the threshold for judging white and black is not exceeded, so black and white judgment cannot be made, and as a result, front and back judgment cannot be made. For this reason, it is difficult to determine a constant threshold value for determining a check mark (monochrome).

  FIG. 8 is a check mark measurement value of the sensor b9 of the roll printer according to the embodiment of the present invention. Since the roll paper on which the check mark is printed is tensioned on the roll paper by the roll paper take-up shaft, the distance between the sensor b9 and the roll paper is kept constant, so that the voltage value change of the reflected wave is stabilized. Therefore, the threshold for determining the check mark (black and white) can be determined to be constant.

  In the roll paper printing apparatus according to the embodiment of the present invention, it is possible to prevent erroneous recognition because the front and back sides are determined by a plurality of check marks. Conventionally, sensor measurement values as shown in FIGS. 9 and 10 have been performed in a state where the behavior of the paper is unstable, and thus it has been impossible to stably acquire the sensor measurement values. However, as shown in FIG. 8, in the roll paper printing apparatus according to the embodiment of the present invention, it is possible to stably perform sensor measurement in a stable state where the paper is wound around the roll winding shaft. .

  According to the present invention, when a roll paper is loaded, a small amount of the roll paper is wound around the roll take-up shaft, and the check mark is detected in a state where the paper is stretched, that is, in a state where the behavior of the paper is stable. Since it is determined, it is possible to make a stable determination. Even when a small-diameter roll paper is loaded, the check mark is detected in a state where the paper is stretched, so that stable determination is possible.

  That is, unlike the conventional apparatus, the roll paper printing apparatus of the present invention can always keep the distance between the sensor for detecting the check mark and the paper constant when detecting the check mark for front / back determination. . As a result, check marks can be detected stably without being affected by the quality of the sensor, and it is not necessary to limit the quality of the sensor to be used, and the manufacturing cost of the roll paper printer can be reduced. It is.

  According to the present invention, when a roll paper is loaded, a small amount of the roll paper is wound around the roll take-up shaft, and the check mark is detected in a state where the paper is stretched, that is, in a state where the behavior of the paper is stable. Since it is determined, it is possible to make a stable determination. Even when a small-diameter roll paper is loaded, the check mark is detected in a state where the paper is stretched, so that stable determination is possible.

  That is, unlike the conventional apparatus, the printing apparatus of the present invention prints a check mark for front / back determination, and always keeps the distance between the sensor for detecting the check mark and the paper constant when detecting the check mark. Is possible. As a result, the check mark can be stably detected without being influenced by the quality of the sensor, and it is not necessary to limit the check mark to a sensor having a good quality, and the manufacturing cost of the printing apparatus can be reduced. .

  As described above, the printing apparatus according to the embodiment of the present invention has been described in detail with reference to FIGS. 1 to 10, but the present invention is not limited to the above description. That is, in the above-described embodiment of the present invention, as shown in FIG. 4, as the front / back determination processing, after the roll paper 2 is wound on the roll winding shaft 3, a check mark is printed in S415, and then the check is performed. Although the mark detection is performed, the check mark printing process may be performed before the roll paper 2 is wound on the roll take-up shaft 3, or a check mark may be provided only on the surface in advance. You may comprise so that front-and-back determination processing may be performed by detecting the check mark using the printed roll paper. The present invention is characterized in that detection of a check mark for determining whether or not roll paper is correctly performed is performed in a state where the behavior of the paper is stable, and deviates from the gist of the present invention. Needless to say, various configurations or shapes can be made without departing from the scope.

1 is a diagram illustrating a configuration of a printing apparatus according to an embodiment of the present invention. It is a figure which shows the outline | summary of the front / back determination in the printing apparatus which is embodiment of this invention. It is a figure which shows the functional block diagram of the printing apparatus which is embodiment of this invention. It is a figure which shows the flow at the time of paper loading in the printing apparatus which is embodiment of this invention. It is a figure which shows the enlarged view of the part enclosed with the dashed-dotted line of FIG. It is a figure which shows the detailed flow of a winding shaft rotation check and a paper jam idling check. It is a figure which shows the outline | summary of a front / back determination process. It is a figure which shows the sensor measured value when roll paper is set normally in the printing apparatus of this invention. FIG. 6 is a diagram (part 1) illustrating measured values of a sensor when roll paper is normally set in the conventional printing apparatus. FIG. 6 is a diagram (part 2) illustrating measured values of a sensor when roll paper is set normally on the front and back of a conventional printing apparatus. It is a figure which shows the structure of the conventional printing apparatus. It is a figure which shows the flow at the time of paper loading in the conventional printing apparatus. It is a figure which shows the outline | summary of the front / back determination in the conventional printing apparatus. It is a figure which shows the outline | summary of the front / back determination in the conventional printing apparatus (when the roll paper to be loaded is small diameter).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Roll set axis | shaft 2 Roll paper 3 Roll winding axis | shaft 4 Motor 5 Print head 5b Platen 6 Belt 7 Gear 8 Sensor a (Roll paper insertion sensor)
9 Sensor b (front and back detection sensor)
10 Sensor c (roll paper transport sensor)
11 sensor d (winding shaft rotation sensor)
12 Solenoid 13 Interlocking lever 14 Guide section entrance 30 Main control section 31 Printing device main control section 32 Roll paper transport control section 33 Print control section 34 Sensor monitoring section 35 Error notification section

Claims (5)

A roll set shaft on which the roll paper is loaded, a roll take-up shaft on the roll paper take-up side, and the roll paper supplied from the roll set shaft is guided to the roll take-up shaft. A printing device comprising a guide unit for printing and a printing unit for printing on the roll paper,
A sensor that detects a check mark used for front / back determination after the roll paper newly loaded on the roll set shaft is guided by the guide unit and wound by the roll winding shaft,
A control unit that determines whether the front and back of the roll paper are correctly set based on the detection result of the check mark detected by the sensor;
A printing apparatus comprising: The roll paper is a thermal paper, and the printing unit performs a printing process on the thermal roll paper with the check mark after the winding process is performed by the roll winding shaft.
The sensor detects whether a check mark printed by the printing unit has been printed,
The printing apparatus according to claim 1, wherein the control unit determines whether the front and back of the roll paper is correctly set based on a detection result of the sensor.   The printing apparatus according to claim 2, wherein the check mark printed by the printing unit includes a plurality of black levels and white levels arranged in order at equal intervals.   The printing according to any one of claims 1 to 3, further comprising an error notification unit that notifies an error when the control unit determines that the front and back of the roll paper are not set correctly. apparatus. In a printing apparatus for printing and recording information on roll paper, a method for determining whether or not the front and back of the roll paper are set correctly,
A check mark used for front / back determination after the roll paper newly loaded on the roll set shaft on the paper feeding side is guided by the guide unit that guides to the winding side and is taken up by the winding shaft on the winding side Detect
It is determined whether the front and back of the roll paper is correctly set based on the detection result of the check mark,
A roll paper set determination method characterized by the above.