JP5395119B2 - Printer and printing method - Google Patents

Description

  Embodiments described herein relate generally to a printer and a printing method.

  For example, a printer that draws and prints a long sheet wound in a roll shape is known. Some printers perform print positioning by detecting, with an optical sensor, black marks provided at regular intervals on the side of the paper conveyance direction. The paper positioned for printing is printed while being conveyed and discharged. The discharged paper is cut into a predetermined size by, for example, a cutter provided in the printer, or perforations are provided in advance in the paper, and the printed paper is separated one by one at the perforation. And attached to the product.

Japanese Patent Laid-Open No. 2005-22130

  By the way, with an apparel tag or the like, the type, size, color, price, etc. of the fabric of the product are printed on the printing surface (front surface) of the paper wound in a roll. On the back side opposite to the tag printing side, there are some which are pre-printed with a logo representing a brand such as a manufacturer or a distributor. For this reason, the tag printed by the printer that determines the printing position with the black mark has a black mark on the same back side as the logo printed surface, making it difficult to see the logo and damaging the brand image for manufacturers, etc. It is not preferable in appearance.

  Also, if the surface on which the mark is provided is a surface to be printed, the mark that has nothing to do with the information necessary for the tag and the printed information remains on the surface, which may make it difficult to see the necessary information. It's never good.

In this embodiment, the printing head for printing on paper, conveying means for feeding transportable said sheet, a sensor for detecting the black mark for printing positioning previously formed in the sheet by a color erasable ink by heating Heating means for applying heat to the paper, and the paper is conveyed by the conveying means until the position of the black mark detected by the sensor reaches the heating means, and the conveyance speed of the paper by the conveying means is set for printing. A decoloring control means for heating and decoloring the black mark of the paper with the heating means while controlling to a slower decoloring speed, and a print position based on the position of the decolored black mark. determined, it conveys the sheet to said print head by said conveying means, while controlling the conveying speed of the sheet by the conveying means speed for printing Anda print control means for causing the printing by the print head in the serial form, heating to the paper by the heating means and the printing by the printing head, and a printer is performed by a series of processes in the print command did.

Schematic of the printer of this embodiment. FIG. 3 is a block diagram showing electrical connection of the printer. The figure which shows the black mark attached | subjected to the paper. 6 is a flowchart illustrating processing executed by the printer.

  Hereinafter, this embodiment will be described with reference to FIGS.

  1 is a schematic diagram of the printer 1 of this embodiment, FIG. 2 is a block diagram showing electrical connection of the printer 1, FIG. 3 is a diagram showing a black mark 3 attached to the back surface of the paper 2, and FIG. 3 is a flowchart showing software processing executed by the printer 1;

  The printer 1 holds the paper 2 wound in a roll shape in the case 1 a by the holding unit 4. In the case 1 a, a printing unit 7 including a thermal head (printing head) 5 for printing on the paper 2 and a platen roller 6 is provided. A paper discharge port 8 is provided on the downstream side of the printing unit 7 in the paper conveyance direction. A sensor 9 is provided between the paper holding unit 4 and the printing unit 7 to detect the black mark 3 attached to the back surface of the paper 2 drawn from the roll held by the holding unit 4. This sensor 9 has a light emitting element and a light receiving element, and whether or not there is a black mark 3 at the position where the light is irradiated depending on the amount of light received from the light emitting element to the paper and the reflected light received by the light receiving element. It is a reflection type sensor for discriminating. A heater 11 is provided between the platen roller 6 and the sensor 9. The platen roller 6 is rotationally driven by a stepping motor 10 and conveys the paper 2 in the direction indicated by arrow A in the figure.

  The printer is provided with a CPU 12, which controls the operation of the printer 1. A ROM 14, a RAM 15, a motor control unit 16, a head control unit 17, a heater control unit 18, a sensor control unit 19, and a communication interface (I / F) 20 are connected to the CPU 12 via a bus line 13. The ROM 14 stores a program executed by the CPU 12 to control the printer 1 and the like. The RAM 15 is provided with a drawing area 15a for expanding print data for printing and a counter 15b for measuring the transport amount of the stepping motor 10, and a work area area necessary for the CPU 12 to execute a program. Have. The motor control unit 16 controls the rotation of the stepping motor 10 for driving the platen roller 6. In this embodiment, the stepping motor 10 is used to accurately control the sheet conveyance. The head controller 17 controls energization of the thermal head 5 in order to perform printing on the paper 2. The heater control unit 18 controls the heater 11 that erases the black mark 3. The sensor control unit 19 controls the sensor 9. An external terminal 22 is connected to the communication I / F 20 via a communication line 21 such as a LAN.

  FIG. 3 shows the back surface of the paper 2. The black mark 3 is formed on the back surface of the paper 2 with ink that can be erased (erased) by heat, and a logo 23 of a manufacturer or brand is printed. The black mark 3 printed on the paper 2 is one in which the color of the ink disappears when a high temperature is applied. The color of the ink disappears, but the ink itself is not removed. The printing surface of the paper 2 has a so-called color developing layer that develops color by the heat of the thermal head. Further, the sheet 2 is conveyed in the arrow direction indicated by A in the drawing.

  In this embodiment, the paper 2 has a color developing layer on the surface. However, the ink ribbon is used to transfer the ink on the paper without the color developing layer with a thermal head for printing. It may be.

  Next, control performed by the printer 1 will be described. The printer 1 performs the processing of the flowchart shown in FIG. 4 according to the program stored in the ROM 14. When data is transmitted from the external terminal 22 to the printer 1, the printer 1 starts processing. When the printer 1 receives the received data (Act 1), it determines whether or not it is a print command (Act 2). If it is not a print command, another process corresponding to the received data is performed (Act 3). The other processing is, for example, returning various types of information such as the usage state of the thermal head in the printer 1 in response to a request from the external terminal 22, but the description thereof is omitted here.

  If the print command is determined in Act 2, the image to be printed is drawn on the drawing area 15a of the RAM 15 based on the received data (Act 4), and the conveyance of the paper 2 is started (Act 5). Note that the data received by the print command includes the size of the paper 2 in addition to the data for printing. If the conveyance of the sheet 2 is started, it is determined whether or not the black mark 3 is detected (Act 6). This determination is made based on whether the amount of light received by the sensor 9 is equal to or greater than a predetermined value. If the amount of received light is equal to or greater than a predetermined value, the amount of reflection of light emitted from the light emitting element is large. Therefore, it is a portion other than the black mark 3. In this determination, the sensor 9 is driven and detected for each step of the stepping motor 10, and the detection result is determined. The mark detection process is repeated until the black mark 3 is detected.

  When the black mark 3 is detected in Act 6, counting of the transport of the stepping motor 10 is started using the transport control counter 15b (Act 7). Next, based on the count number of the counter, it is determined whether the black mark 3 has reached the position of the heater 11 (Act 8), that is, whether the black mark 3 has reached the erase position. Since the distance from the sensor 9 to the heater 11 is known in the design of the product, the sheet 2 reaches the position of the heater 11 by counting the number of steps of the stepping motor 10 after detecting the black mark 3 by the sensor 9. It can be determined whether or not. When the black mark 3 reaches the position of the heater 11, the heater control unit 18 drives the heater 11 (Act 9) and starts erasing the black mark 3. Next, it is determined whether or not the conveyance of the length of the black mark 3 has been completed (Act 10). When the conveyance of the length of the black mark 3 has been completed, the driving of the heater 11 is stopped (Act 11). Here, the erasing operation is to apply a temperature sufficient for erasing the black mark to the paper 2 by the heater 11.

  Next, if the conveyance of the length of the black mark 3 is not completed by the determination of Act 10 or the heater 11 of Act 11 is stopped, whether or not the sheet 2 has reached the print start position is determined by the count number of the counter 15b. Judgment is made (Act 12). Similar to the processing for erasing the black mark 3, since the distance from the sensor 9 to the thermal head 5 is known from the design of the product, the printing position can be determined by counting the number of steps that the stepping motor 10 has transported the paper 2. Can be determined accurately. If the print start position is not reached in Act 12, the process returns to the process of determining whether Act 10 has been erased. When the print start position is reached in Act 12, the print data for one line is read from the data drawn in the drawing area 15a, and information to be printed is given to the thermal head 5, and the thermal head 5 uses the information on the paper. 2 is heated to develop color (Act 13).

  Next, it is determined whether or not the printing is finished (Act 14). This process is determined based on whether all the print data in the RAM 15 has been printed. If there is still print data, the process starting from whether or not the position of the heater 11 of Act 10 has been reached is repeatedly executed.

  When printing is finished in Act 14, the paper 2 is conveyed until it is discharged (Act 15), that is, the stepping motor 10 is rotated by the distance to the paper discharge port, and then the stepping motor 10 is stopped to The conveyance is stopped (Act 16). When the sheet conveyance is stopped, the operator cuts the sheet 2 with the cutter of the sheet discharge port 8. If the printed portion of the paper 2 is discharged, the tip of the non-printed portion of the paper 2 is sent to the vicinity of the paper discharge port 8, so that the paper may be used when the next printing is performed if necessary. It is possible to reduce the waste of the sheet 2 by conveying the sheet 2 in the reverse direction and returning it to a predetermined position.

  By the way, in this embodiment, the printing position is a position where printing starts, and is the left end of the black mark 3 shown in FIG. Therefore, if the black mark 3 is detected by the sensor 9, the sheet 2 is moved to the print start position when the sheet 2 is conveyed by the distance from the sensor 9 to the thermal head 5. Further, when the sheet 2 is conveyed by the distance from the sensor 9 to the heater 11, the sheet 2 becomes the erasure start position. However, the print start position of the paper 2 is not limited to the left end of the black mark 3 and can be determined as appropriate.

  As described above, in this embodiment, since the black mark 3 for printing positioning provided on the paper 2 so as to be erasable by heat is erased, there is no black mark 3 on the paper 2 after printing. Since the logo 23 printed in advance is left as it is, it is possible to provide a visually beautiful printed matter. In addition, since the black mark is erased in a series of processes according to the print command, it is not necessary to give a command for erasing the black mark.

  Next, a modification of this embodiment will be described. In this modification, the black mark 3 is erased by the thermal head 5 that performs printing in the case where the black mark 3 is provided on the printing surface. The printing surface of the paper 2 has a characteristic that the color is developed at a certain first temperature and the color is erased at a second temperature higher than the first temperature. The black mark 3 is formed on the printing surface of the paper 2 in advance. The paper 2 is formed by coloring.

  When the black mark 3 is detected after receiving the print command and starting the paper conveyance, the paper is conveyed until the black mark 3 reaches the thermal head 5. When the black mark 3 reaches the thermal head 5, erasing of the black mark 3 is started. Since the black mark 3 needs to be erased at a temperature higher than that for normal printing, the conveyance speed is set slower than that for normal printing so that sufficient heat is applied. After the erasing of the black mark 3 is finished, printing is performed by returning the paper conveyance speed to the conveyance speed at the time of printing.

  By doing so, the black mark 3 is not left on the printed surface after printing in order to erase the black mark 3. In addition, since erasing is performed using the thermal head 5 and printing is performed using the same thermal head 5, erasing can be performed using only one thermal head 5 without providing the heater 11. In addition, since the portion for detecting the printed black mark 3 uses the positioning sensor 9 of the printer 1, it is not necessary to provide a new sensor.

  In this modified example, if it is necessary to perform printing on the black mark 3 portion, the thermal head 5 is decolored, so that the corresponding dot of the black mark 3 is not erased for the dots to be printed. It can also be used as a part of print information. Further, the sensor 9 that detects the black mark 3 is a line sensor that can detect the entire width direction of the paper, and this line sensor detects the length of the black mark 3 in the width direction of the paper. If erasing is performed by the thermal head 5 by the length, the black mark 3 can be surely erased even on papers having different black mark 3 sizes.

  In the modification, the paper 2 has been described as having the property of developing at the first temperature and erasing at the second temperature. However, the paper has the property of developing only at the normal first temperature. The black mark 3 may be formed on the paper with another erasable ink.

  As described above, in this printer, the necessary information is not erased and the black mark 3 is erased (erased), so that it is possible to provide a printed matter whose display contents are easy to see.

  Not only this embodiment but various modifications can be made within a necessary range. For example, printing is not limited to a thermal head, but may be performed by an ink jet printer or an electrophotographic system. Further, as described above, when a thermal head is used, a printer that uses an ink ribbon coated with an ink that can be erased by heat and transfers the ink ribbon to a sheet can be used.

1 .. Printer 2 .. Paper 3 .. Black mark 5 .. Thermal head 6 .. Platen roller 7 .. Printing unit 9 .. Sensor 11 .. Heater (heating means)

Claims (4)

A print head for printing on paper;
Conveying means for feeding transportable said sheet,
A sensor for detecting the black mark for printing positioning previously formed in the sheet by a color erasable ink by heating,
Heating means for applying heat to the paper;
The paper is conveyed by the conveying means until the position of the black mark detected by the sensor reaches the heating means, and the conveying speed of the paper by the conveying means is controlled to a decoloring speed lower than that for printing. And a decoloring control means for decoloring by heating the black mark of the paper with the heating means,
A printing position is determined based on the position of the erased black mark, the paper is transported to the print head by the transport means, and the transport speed of the paper by the transport means is controlled to a printing speed. and print control means for causing the printing by the print head to the paper while,
Have,
A printer in which printing by the print head and heating of the paper by the heating means are performed by a series of processes in a print command . The sheet heat-sensitive layer is provided printed surface thereof is decolored at a second temperature and color at a first temperature, the black mark claim 1 Symbol placement printer was formed by coloring a heat-sensitive layer. The printer according to claim 1, wherein the print head and the heating unit are the same thermal head. Based on the reception of the print command, the conveyance of the paper is started,
During the conveyance, a black mark for print positioning formed in advance in the paper by ink that can be erased by heating is detected,
Transport the paper until the position of the detected black mark reaches the heating means,
While controlling the conveyance speed of the paper to a decoloring speed lower than that for printing, the black mark in the paper is heated by the heating means to decolorize,
Determine the printing position based on the position of the erased black mark and transport the paper to the print head,
A printing method for performing printing based on the print command on the paper by the print head while controlling a conveyance speed of the paper to a printing speed.

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