JP2008149464A - Printer, printing system, method for controlling printer and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a printer which can stabilize a power supply voltage by partially adjusting printing densities according to printing elements, a printing system, a method for controlling the printer, and a program. <P>SOLUTION: The printer 3 which receives power supply from a power supply part 17 and prints printing data comprised of a plurality of element data is equipped with an importance degree judging means which judges an importance degree of each element data, an electric voltage detecting means which detects the power supply voltage V of the power supply part 17, a voltage judging means which judges whether or not the power supply voltage V is not larger than a predetermined voltage, a printing adjusting means which adjusts the printing densities of a plurality of the element data to be thin sequentially from the element data judged to be low in the importance degree when the voltage judging means judges that the supply voltage is not larger than the predetermined voltage, and a printing means 12 which prints a plurality of the element data by the adjusted printing densities. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a printing apparatus, a printing system, a printing apparatus control method, and a program for printing while suppressing a decrease in power supply voltage.

2. Description of the Related Art Conventionally, printing apparatuses that improve the storage state by applying an overcoat layer to color-printed recording paper are known. This printing apparatus inspects the remaining battery capacity before starting printing, and when the power supply from the battery is insufficient, the printing process of the overcoat layer that requires the most power supply for the printing process is omitted. Avoid sudden stops (see Patent Document 1).
JP 2002-192807 A

  However, the above printing apparatus has a problem that it is limited to a printing apparatus that performs overcoat printing. In order to solve this, considering that the power consumption of the printing apparatus is generally proportional to the print density, it is possible to reduce the power consumption and reduce the voltage drop by reducing the print density. However, if the printing density is reduced as a whole, there is a problem that important information is printed thinly. For example, in a receipt printer, if printing is performed with a light print density as a whole, the purchase merchandise information of the receipt and the total amount of money are reduced, and the role of the receipt can no longer be fulfilled.

  Accordingly, it is an object of the present invention to provide a printing apparatus, a printing system, a printing apparatus control method, and a program capable of stabilizing the power supply voltage by partially adjusting the printing density according to the printing element. .

  The printing apparatus according to the present invention includes an importance determination unit that determines the importance of each element data in the printing apparatus that receives power supply from the power supply unit and prints print data including a plurality of element data, and a power supply for the power supply unit. A voltage detection unit that detects a voltage; a voltage determination unit that determines whether the power supply voltage is equal to or lower than a predetermined voltage; and a print density of a plurality of element data when the voltage determination unit determines that the voltage is equal to or lower than a predetermined voltage. It is characterized by comprising: a print adjustment unit that adjusts lightly in order from the element data determined to be low in importance; and a print unit that prints a plurality of element data at the adjusted print density.

  According to a printing apparatus control method of the present invention, in the printing apparatus control method for receiving print power from a power supply unit and printing print data including a plurality of element data, the printing apparatus determines the importance of each element data. Detecting the power supply voltage of the power supply unit, determining whether the power supply voltage is equal to or lower than a predetermined voltage, and when the voltage determining means determines that the voltage is lower than the predetermined voltage, The step of performing light adjustment in order from the element data determined to be low in importance and the step of printing a plurality of element data with the adjusted print density are performed.

  According to these configurations, by reducing the printing density, it is possible to reduce power consumption used during printing and to suppress a decrease in power supply voltage. For example, if it is a thermal printing device, it reduces power consumption by reducing the energization time to the thermal head, and if it is an ink jet printing device, it reduces power consumption by reducing the number of ink ejections. Can do. Also, because the lightness is printed in order from the lower importance element data based on the importance determined for each element data, the printing density of the higher importance element data is given priority over the printing density of the lower importance element data. Can be printed darkly. For example, in the case of a receipt printing device, information of high importance such as purchased merchandise information and total amount of the receipt is printed with a print density that can be visually confirmed by the customer. Even if low information is printed thinly, it can serve as a receipt.

  In this case, it is preferable that the print adjustment unit does not adjust the print density of the most important element data to be thinner than the specified density.

  According to this configuration, the print density of the most important element data is not lightly printed. For this reason, for example, in the case of a receipt printing apparatus, important information such as the purchased merchandise information and the total amount of the receipt can be surely provided to the customer.

  In this case, it is preferable to further include a non-target data specifying means for specifying element data that is not a print density adjustment target.

  According to this configuration, the element data designated by the user can be excluded from the print density adjustment target, and the range of print density adjustment can be widened. For example, bar codes and two-dimensional codes may not be read by a code reader when printed thinly. Therefore, when it is desired to read them reliably, they may be designated outside the print density adjustment target.

  In this case, it is preferable that character analysis means for analyzing the character of the element data is further provided, and the importance level determination means determines the importance level based on the analyzed character.

  According to this configuration, the print density of the element data can be automatically adjusted based on the analysis result of the character analysis means. For example, if the analyzed character is element data with high importance such as the total amount of money, it is printed at the specified print density, and if it is element data with low importance such as an advertisement, the print density is reduced. Can be printed.

  In this case, it is preferable that the importance level determination unit determines the importance level of the element data based on the data type of the element data.

  According to this configuration, the print density of the element data can be automatically adjusted based on the determination result of the importance determination unit. For example, when the data type of the determined element data is text data, printing is performed with a specified print density, and when the element data is graphic data that consumes a lot of power, printing is performed with a reduced print density. . The data type includes data formats such as text data and graphic data described above.

  In this case, it is preferable that the importance level determination unit determines that the importance level is the lowest when the data type is graphic data.

  According to this configuration, for example, in the case of a receipt printing apparatus, the print density of graphic data (for example, a logo mark) with high power consumption and low importance is thinned preferentially, so that other element data The influence on the print density can be reduced.

  In this case, the image processing apparatus further includes a database that associates graphic data with text data to be printed as an alternative to the graphic data, and the print adjustment unit, when the data type is graphic data, associates the graphic data with the text data. It is preferable to convert to

  According to this configuration, it is possible to reduce power consumption without losing information indicated by graphic data by changing graphic data with high power consumption to text data corresponding thereto.

  A printing system according to the present invention includes a printing apparatus that receives power supply from a power supply unit and prints print data including a plurality of element data, and an information processing terminal connected to the printing apparatus. The terminal includes an importance level determination unit that determines the level of importance of each element data, and a transmission unit that transmits a plurality of element data and a determination result obtained by the importance level determination unit. Voltage detecting means for detecting, voltage determining means for determining whether or not the power supply voltage is equal to or lower than a predetermined voltage, and when the voltage determining means determines that the voltage is equal to or lower than the predetermined voltage, the print density of the plurality of element data transmitted is determined. A print adjustment unit that adjusts lightly in order from element data having a lower importance level based on the determination result; and a print unit that prints a plurality of element data at the adjusted print density. And features.

  According to this configuration, the printing apparatus can perform printing based on information acquired from the information processing terminal without performing complicated information processing. Thereby, the configuration of the printing apparatus can be simplified, and the downsizing and cost reduction of the printing apparatus can be realized.

  A program according to the present invention causes a computer to execute each step in the control method of the printing apparatus.

  According to this configuration, it is possible to provide a program that can suppress a decrease in power supply voltage by partially adjusting the print density according to the importance of printed information.

  Hereinafter, a printing apparatus, a printing system, a printing apparatus control method, and a program according to an embodiment of the present invention will be described. The present invention adjusts the power supply voltage of the printing apparatus to be stabilized when the operating voltage is expected to decrease by adding an expansion boat to the receipt printing apparatus, for example. In the present embodiment, a case will be described in which an operation voltage for performing a printing process cannot be sufficiently ensured by adding an expansion boat to the receipt printing apparatus.

  FIG. 1 is a block diagram showing the system configuration of the receipt printing system 1. The receipt printing system 1 includes a host device 2 that generates print data for printing on a receipt R, and a receipt printing device that is connected to the host device 2 via a connector 4 and prints print data received from the host device 2. 3. The print data consists of a plurality of element data corresponding to each character string printed on the receipt R. The receipt printing apparatus 3 is configured to read a plurality of element data in units of lines from the print data received from the host apparatus 2 and print on the receipt R line by line. The element data specifically includes graphic data such as a logo 41 indicating a store name, a barcode 42 and the like, “T-shirt” and “shoes” which are purchased products, and “08/08/2005” which is a date. Etc. (refer to FIG. 5).

  The host device 2 includes a keyboard and a code reader (not shown), and obtains product information by generating input using the keyboard or reading by the code reader, generates print data, and displays the product name, sales amount, etc. on the display. The amount of purchased goods is presented to the customer. Then, the print data generated in the host device 2 is transmitted to the receipt printing device 3 via the connector 4.

  The receipt printing apparatus 3 includes a conveyance unit 11 that conveys the receipt R, a printing unit 12 (printing unit) that prints the receipt R in synchronization with the conveyance of the receipt R, and a cut that cuts a printed portion of the receipt R. A unit 13 and a drive unit 14 for driving them are provided, and each unit is connected to the control unit 16 via a drive circuit 15. The receipt printing apparatus 3 also includes a power supply unit 17 that supplies power to each unit of the receipt printing apparatus 3 and a voltage monitoring unit 18 that monitors the power supply voltage V of the power supply unit 17. The receipt printing apparatus 3 of the present embodiment is a thermal printing apparatus, and the printing unit 12 has a thermal head (not shown).

  The voltage monitoring unit 18 includes a comparator (not shown) that compares the power supply voltage V of the power supply unit 17 with a reference voltage value, detects the power supply voltage V of the power supply unit 17 (voltage detection means), and supplies the power supply voltage. The voltage drop of the power supply unit 17 is monitored by comparing V and a reference voltage value (voltage discrimination means). In the present embodiment, a first reference voltage value V1 and a second reference voltage value V2 that is larger than the first reference voltage value V1 are provided as reference voltage values, and the printing method is changed depending on the detected voltage value of the power supply voltage V. It is the composition to do.

  FIG. 2 shows a graph showing a drop in the power supply voltage V of the receipt printing apparatus 3 on the left side of the drawing, and shows each state of graphic data printed on the receipt R on the right side of the drawing corresponding to the graph. The receipt printing apparatus 3 performs prescribed printing (host apparatus 2) when the power supply voltage V detected by the voltage monitoring unit 18 is greater than the second reference voltage value V2 (when the power supply voltage V> the second reference voltage value V2). If the second reference voltage value V2 is less than or equal to the first reference voltage value V1 (when the second reference voltage value V2 ≧ the power supply voltage V> the first reference voltage value V1), the graphic is printed. Printing is performed by adjusting the print density of the data thinly (print adjustment means). If the first reference voltage value V1 or less (when the first reference voltage value V1 ≧ the power supply voltage V), the graphic data is converted into text data. Convert and print (data conversion means). In this way, by changing the graphic data printing method as the power supply voltage V of the receipt printing apparatus 3 decreases, the decrease in the power supply voltage V can be suppressed without impairing the appearance of the printed result as much as possible. In the case where the print density of the graphic data is adjusted to be thin to suppress the decrease in the power supply voltage V, it is preferable to adjust the graphic data to a print density at which the graphic data can be visually observed at least.

  The drive circuit 15 adjusts the amount of current supplied to each unit of the receipt printing apparatus 3 based on the control of the control unit 16. The drive circuit 15 controls ON / OFF switch (transistor) in the circuit to control the supply / stop of current to each part, and also adjusts the print density adjustment by adjusting the current application time to the thermal head. It is the composition which does.

  Here, a method for adjusting the print density will be described with reference to FIG. FIG. 3A shows a head energization signal in a normal state, and FIG. 3B shows a head energization signal when the power supply voltage V is equal to or lower than the second reference voltage value V2 and higher than the first reference voltage value V1. . When the power supply voltage V is equal to or lower than the second reference voltage value V2 and greater than the first reference voltage value V1, the receipt printing apparatus 3 drives the ON / OFF switch in the drive circuit 15 to supply a current to the thermal head. T2 is controlled to be shorter than the energization period T1 of the normal head energization signal. In this case, the amount of current supplied to the thermal head is saved as compared with the normal time because the energization time to the thermal head is short. That is, in general, the amount of current consumption is proportional to the print density, so by shortening the energization time to the thermal head, the amount of current supplied to the thermal head is reduced and printing is performed on the receipt R. The print density can be adjusted thinly.

  The control unit 16 includes a connection interface 21, a CPU 22 (Central Processing Unit), a ROM 23 (Read Only Memory), and a RAM 24 (Random Access Memory), which are connected to an internal bus 25. The ROM 23 stores a control program 32 and a database 31 for converting graphic data into alternative data (see FIG. 1).

  The database 31 stores graphic data and text data to be printed as an alternative to the graphic data in association with each other. For example, as shown in FIG. 4, a logo 41 indicating “TM SPORTS” which is a store name and text data corresponding to the logo 41 are stored in association with each other. In this case, even if the logo 41 indicating “TM SPORTS” is replaced with the corresponding text data and printed on the receipt R, the customer can know the store name information from the printed text data. (See FIG. 7).

  The control program 32 is for controlling each part of the receipt printing apparatus 3 based on the print data transmitted from the host apparatus 2. Specifically, according to the control program 32, the CPU 22 determines the level of importance of each element data included in the received print data (importance level determination means). The level of importance is determined based on the data type (print command). When the read element data is graphic data, it is determined as low importance, and when it is text data, it is determined as high importance. Then, based on the determination result of the power supply voltage V and the determination result of the importance level, the CPU 22 controls the drive circuit 15 to adjust the print density and convert the graphic data to the text data.

  In this case, the user can also specify element data that is not to be converted to text data and not to be adjusted for print density (non-target data specifying means). In this case, the barcode print command is stored in the ROM 23, and when the print command is executed, control is performed so as to exclude it from the print density adjustment target and the text data conversion target. For example, since the barcode 42 and the two-dimensional code may not be read by a code reader when printed thinly, the barcode 42 and the two-dimensional code are designated as non-adjustment targets when the customer wants to read them reliably. In the present embodiment, the barcode 42 is designated not to be converted into text data and not to be adjusted for print density.

  When the power supply voltage V monitored by the voltage monitoring unit 18 is equal to or lower than the second reference voltage value V2 and greater than the first reference voltage value V1 (when the second reference voltage value V2 ≧ the power supply voltage V> the first reference voltage value V1). When it is determined that the element data is graphic data, the CPU 22 controls the drive circuit 15 according to the control program 32 so as to shorten the energization time to the thermal head and adjust the printing so that the receipt R is printed lightly. . On the other hand, if it is determined that the element data is text data, printing is performed on the receipt R with a specified current amount. In the present embodiment, since the barcode 42 is designated as a printing density adjustment target, only the “TM SPORTS” logo 41 is printed lightly (see FIG. 6).

  Further, when the power supply voltage V monitored by the voltage monitoring unit 18 is equal to or lower than the first reference voltage value V1 (when the first reference voltage value V1 ≧ the power supply voltage V), it is determined that the element data is graphic data. The CPU 22 converts the graphic data into corresponding text data with reference to the database 31 according to the control program 32. On the other hand, if it is determined that the element data is text data, normal printing is performed. In the present embodiment, since the barcode 42 is designated as not to be converted into text data, only the “TM SPORTS” that is the logo 41 is converted into text data and printed (see FIG. 7).

  Next, the printing process in the receipt printing apparatus 3 will be described with reference to the flowchart of FIG.

  When the receipt printing apparatus 3 receives the print data from the host apparatus 2 (S01), the receipt printing apparatus 3 reads a plurality of element data corresponding to each line of the receipt R from the print data, and stores one line in the receipt R. Printing is started one by one (S02). Then, it is determined whether or not the graphic data is included in the element data included in one line (S03). If it is determined that the graphic data is not included (S03: No), the receipt R is printed at a normal density. (S04). If it is determined that graphic data is included (S03: Yes), it is determined whether the graphic data is a barcode 42 (S05). When the graphic data is the barcode 42 (S05: Yes), the receipt R is printed at a normal density (S04). When the graphic data is not the barcode 42 (S05: No), it is determined whether or not the power supply voltage V is equal to or lower than the second reference voltage value V2 (S06).

  When the power supply voltage V is greater than the second reference voltage value V2 (S06: No), the receipt R is printed at a normal density (S04). When the power supply voltage V is less than or equal to the second reference voltage value V2 (S06: Yes), it is determined whether or not the power supply voltage V is less than or equal to the first reference voltage value V1 (S07). When the power supply voltage V is greater than the first reference voltage value V1 (S07: No), printing is performed with the print density of only graphic data reduced (S08), and the power supply voltage V is equal to or less than the first reference voltage value V1. In this case (S07: Yes), graphic data is converted into alternative text data and printing is performed (S09). In this way, when printing of the first line is completed (S10), this process is repeated until the last line of the receipt R is printed (S11).

  As described above, the receipt printing apparatus 3 according to the present embodiment adjusts the print density of graphic data with high power consumption during printing or converts the graphic data into text data according to the detected power supply voltage V. Thus, a decrease in power supply voltage V can be suppressed. This suppresses a decrease in the power supply voltage V of the receipt printing apparatus 3 due to the addition of the expansion boat, and also provides the customer with a receipt R that holds information such as purchased merchandise information and total amount that is highly important element data. Can do.

  Next, a modification of the above embodiment will be described. In the modification, the receipt printing apparatus 3 analyzes the character printed on the receipt R (character analyzing means) and determines the level of importance of each element data based on the analysis result. In this case, the user designates a character string and stores it in the ROM 23 in advance. When the character string analyzed by the receipt printing apparatus 3 matches the character string designated by the user, the element data that is the character string is determined to have high importance. On the other hand, if it does not match the character string designated by the user, it is determined as low importance. In the present embodiment, information 44 regarding purchased items such as character strings “T-shirts”, “shoes”, “* co”, “* yen”, a total amount 45 such as character strings “total”, “consumption tax”, A deposit amount 46 such as a character string “cash” and a change 47 such as a character string “fishing” are designated as highly important element data, and a barcode 42 is designated as not being subject to print density adjustment (see FIG. 9). ).

  When the power supply voltage V monitored by the voltage monitoring unit 18 is equal to or lower than the second reference voltage value V2 and greater than the first reference voltage value V1 (when the second reference voltage value V2 ≧ the power supply voltage V> the first reference voltage value V1). If it is determined that the element data is of low importance, adjustment is made so that the receipt R is printed lightly. On the other hand, if it is determined that the element data is of high importance, printing is performed on the receipt R with a specified print density. In the present embodiment, the product name, quantity, price information 44, the total amount 45, the deposit amount 46 and the change 47 regarding the purchased product “T-shirt” and “shoes” are printed at a prescribed print density. Element data such as date and branch name is printed lightly on the receipt R (see FIG. 9).

  Further, when the power supply voltage V monitored by the voltage monitoring unit 18 is equal to or lower than the first reference voltage value V1 (when the first reference voltage value V1 ≧ the power supply voltage V), the graphic data is converted into corresponding text data. In the present embodiment, “TM SPORTS” which is the logo 41 is converted into text data (see FIG. 10).

  As described above, in the receipt printing apparatus 3 according to the modification of the present embodiment, the printing method of the low-importance element data that does not match the character string designated by the user is changed according to the detected power supply voltage V. Thus, it is possible to suppress a decrease in the power supply voltage V of the receipt printing apparatus 3 due to the addition of the expansion boat. As described above, since the importance is determined for each character string, it is possible to perform control corresponding to the importance more than the configuration in which only the graphic data such as the logo 41 is determined to be the low importance. Yes. Moreover, it is good also as a structure which designates a low importance character string instead of designating a high importance character string. In addition, the degree of importance may be set in a plurality of stages. Accordingly, since the lighter printing is performed in order from the lower importance element data, the print density of the high importance element data can be preferentially darker than the print density of the lower importance element data. In this case, if the graphic data is judged to have the lowest importance, the print density of graphic data with a high density ratio and high power consumption during printing is reduced, thereby affecting the print density of other element data. Can be reduced.

  In the present embodiment and its modification, the receipt printing apparatus 3 has been described as an example. However, the present invention is not limited to this, and can be applied to other printing apparatuses. In particular, it is effective for a device having a limited battery capacity, such as a handy-type receipt printing apparatus 3. Further, the present invention can be applied not only to a thermal printing apparatus but also to an inkjet printing apparatus. In this case, the power consumption of the printing apparatus is reduced by reducing the number of ink ejections. In the present embodiment, the configuration has two reference voltage values. However, the configuration may have one reference voltage value, or may have three or more reference voltage values. That is, it is possible to perform only data conversion of graphic data, or a configuration in which density adjustment of printing density is performed in a plurality of stages according to importance.

  Further, in the present embodiment and the modification thereof, the receipt printing apparatus 3 is configured to determine the importance level of the element data. Alternatively, the host apparatus 2 may be configured to determine the importance level of the element data. In this case, when the host apparatus 2 transmits print data to the receipt printing apparatus 3, the determination result of the importance of each element data is also transmitted, and the receipt printing apparatus 3 performs print control based on the determination result. Thus, print control can be performed with the data acquired from the host device 2 without the receipt printing device 3 performing complicated determination processing, and the control configuration of the receipt printing device 3 can be simplified.

  Furthermore, each part (each function) of the receipt printing apparatus 3 shown in the above example can be provided as a program. Further, the program can be provided by being stored in a recording medium (not shown). As the recording medium, a CD-ROM, flash ROM, memory card (compact flash (registered trademark), smart media, memory stick, etc.), magneto-optical disk, digital versatile disk, flexible disk, and the like can be used.

  Further, the apparatus configuration and processing steps of the receipt printing apparatus 3 can be appropriately changed without departing from the gist of the present invention, regardless of the above-described embodiment.

1 is a system configuration diagram of a receipt printing system. It is the graph which shows the fall of the power supply voltage of a receipt printing apparatus, and the transition diagram of the state of the graphic data printed on the receipt. (A) is a figure which shows the head energization signal at the time of normal, (b) is a figure which shows a head energization signal when a power supply voltage is below a 2nd reference voltage value and larger than a 1st reference voltage value. It is a figure which shows the database which linked | related graphic data and the text data for printing as an alternative of the said graphic data. It is a figure which shows an example of the receipt in a normal state. It is a figure which shows an example of the receipt in the case of 2nd reference voltage value> = power supply voltage> 1st reference voltage value. It is a figure which shows an example of the receipt in the case of 1st reference voltage value> = power supply voltage. It is a flowchart of the printing process in a receipt printing apparatus. It is a figure which shows an example of the receipt in the case of the 2nd reference voltage value> = power supply voltage> 1st reference voltage value of a modification. It is a figure which shows an example of the receipt in the case of 1st reference voltage value> = power supply voltage of a modification.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Receipt printing system (printing system) 2 ... Host apparatus (information processing terminal) 3 ... Receipt printing apparatus (printing apparatus) 12 ... Printing part (printing means) 17 ... Power supply part 31 ... Database V ... Power supply voltage

Claims (10)

In a printing apparatus that receives power supply from a power supply unit and prints print data including a plurality of element data.
Importance determining means for determining the importance of each element data;
Voltage detection means for detecting a power supply voltage of the power supply unit;
Voltage determining means for determining whether the power supply voltage is equal to or lower than a predetermined voltage;
Print adjustment means for adjusting the print density of the plurality of element data in order from the element data determined to be low in importance when the voltage determination means determines that the voltage is equal to or lower than a predetermined voltage;
And a printing unit that prints the plurality of element data at the adjusted print density.   The printing apparatus according to claim 1, wherein the print adjustment unit does not adjust the print density of the most important element data thinly from a predetermined density.   The printing apparatus according to claim 1, further comprising non-target data specifying means for specifying the element data that is not the adjustment target of the print density. Further comprising character analysis means for analyzing the character of the element data;
The printing apparatus according to claim 1, wherein the importance level determination unit determines the importance level based on the analyzed character.   The printing apparatus according to claim 1, wherein the importance level determination unit determines the importance level of the element data based on a data type of the element data.   The printing apparatus according to claim 5, wherein the importance determination unit determines that the importance is the lowest when the data type is graphic data. A database that associates the graphic data with text data to be printed as an alternative to the graphic data;
The printing apparatus according to claim 5, wherein, when the data type is graphic data, the print adjustment unit converts the graphic data into the related text data. In a printing system including a printing apparatus that receives power supply from a power supply unit and prints print data including a plurality of element data, and an information processing terminal connected to the printing apparatus,
The information processing terminal
Importance determining means for determining the importance of each element data;
A transmission unit that transmits the determination result by the plurality of element data and the importance level determination unit,
The printing apparatus includes:
Voltage detection means for detecting a power supply voltage of the power supply unit;
Voltage determining means for determining whether the power supply voltage is equal to or lower than a predetermined voltage;
When the voltage determination unit determines that the voltage is equal to or lower than a predetermined voltage, the print adjustment unit adjusts the print density of the transmitted plurality of element data lightly from the element data having the lowest importance based on the determination result. When,
And a printing unit that prints the plurality of element data at the adjusted print density. In a control method for a printing apparatus that receives power supply from a power supply unit and prints print data including a plurality of element data.
The printing device is
Determining the importance of each element data;
Detecting a power supply voltage of the power supply unit and determining whether the power supply voltage is equal to or lower than a predetermined voltage;
Adjusting the print density of the plurality of element data thinly in order from the element data determined to be low in importance when the voltage determination unit determines that the voltage is equal to or lower than a predetermined voltage;
Printing the plurality of element data with the adjusted print density. A control method for a printing apparatus, comprising:   A program for causing a computer to execute each step in the method for controlling a printing apparatus according to claim 9.

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