JP2010023297A - Control method for printer and printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a printer which cancels printing data without making reprinting when it is predicted that paper is wasted if the printer makes printing as it is when returning from an operation stop state. <P>SOLUTION: A roll paper printer 1 stops printing operation when detecting various kinds of error states, returns from the error state with cover closing operation to switch an opening/closing cover 3 from an opened state to a closed state as a trigger, and restarts interrupted printing operation. When restarting the printing operation, the printer 1 performs paper discriminating operation to discriminate recording paper 12a loaded in a roll paper storing part 11, and decides whether paper type of the recording paper 12a loaded at present agrees with paper type designated as an object to be printed in unfinished printing data stored and held in a receiving buffer. The printer 1 makes reprinting of the printing data, when it is decided that the paper types agree with each other, and reads and cancels the printing data, when it is decided that they do not agree with each other. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a printer that returns to a printable state by a predetermined return process when an error state is entered, and a control method therefor.

  Conventionally, printing stops when various error conditions such as out of paper, paper jam, and paper type mismatch occur, and when the cause of the error is removed, it returns to a printable state and resumes interrupted printing. A printer has been proposed.

For example, Patent Document 1 discloses that when a paper jam condition, a paper out condition, a cover open condition, or the like during printing or paper feeding is detected, printing is stopped and the printer enters an offline state. A receipt printer that returns to a state is described. This printer discards the print data received immediately before the error state occurs from the reception buffer, and also discards all the print data received after the error state occurs. Then, when the printer returns, the reception buffer is cleared again and a signal to that effect is sent to the host computer to retransmit the print data from the host computer. As a result, it is possible to prevent a problem that a wasteful printed matter is issued due to the automatic restart of printing from a portion interrupted after the return, and it is possible to suppress wasteful consumption of consumables such as printing paper and ink. .
JP 2006-62266 A

  When the printer of Patent Document 1 is in an error state, all print data that is in the middle of printing or unprinted is discarded, and even data that does not cause a problem even if printing is resumed is discarded. Therefore, it is necessary to retransmit all print data that has not been printed from the host computer side at the time of return, and the processing load on the host computer is large. Further, since the printer side requests re-transmission after resuming to re-receive and re-analyze the print data, it takes time to complete re-printing of the discarded print data.

  Further, in the printer of Patent Document 1, an operation such as loading a new printing paper or changing a setting is performed during the restoration process, so that the state of the printer at the time of restoration or the loaded printing paper is not printed. It is not assumed that the print data will not be suitable for printing. Therefore, if printing is resumed as it is in such a case, the retransmitted print data may be printed on a non-conforming paper, and the print paper may be wasted.

  In view of these points, the present invention has an object to provide a printer that discards print data without performing reprinting when it is predicted that paper will be wasted if printing is performed as it is when returning from an error state. The purpose is to propose a printer control method.

In order to solve the above problems, a printer control method of the present invention includes:
When a predetermined error state is detected, the state shifts to an operation stop state, and waits until a predetermined return process for eliminating the error state is performed,
When the return process is performed, it returns to the operable state, and determines whether or not the received print data that has not been printed at the time of shifting to the operation stop state can be normally printed,
When it is determined that printing can be performed normally, the printing operation of the print data is started,
If it is determined that printing cannot be performed normally, the print data is discarded.

  As described above, the present invention determines whether or not the received print data that has not been printed can be printed normally according to the state of the printer after the return when the return from the operation stop state is completed. Since print data that cannot be predicted is discarded without being printed, wasteful consumption of consumables such as print media and ink due to printing of print data that cannot be printed normally can be suppressed. In addition, since print data that is expected to be printed normally is printed as it is, it is possible to minimize the effort required for normal reprinting.

  In the present invention, when a plurality of received print data for which printing has not been completed is stored at the time of shifting to the operation stop state, whether or not each of the plurality of print data can be normally printed. The print data determined to be unable to be printed normally among the plurality of print data is discarded, and the printing operation of the print data determined to be normally printed is started. In this way, by selecting received print data and printing only print data that can be printed normally, and discarding other print data, it is possible to create only prints that are not wasted. Further, it is possible to reduce the trouble of reprinting.

  In the present invention, when the return process is performed, the print medium loaded in the print medium loading unit when returning to the operable state is a print target to be printed in the received print data. It is determined whether or not it matches with the medium. When it is determined that it matches, the printing operation of the print data is started, and when it is determined that they do not match, the print data is discarded. Good. In this way, since printing is not performed on an unsuitable print medium, it is not necessary to waste consumables such as the print medium and ink.

  At this time, it is preferable that the return process includes a process of detecting a cover close for closing an open / close cover for opening and closing the print medium loading unit. A cover close operation that opens and closes the print media loading unit is always performed during actions taken to resolve error conditions such as out of paper, paper jam, and paper incompatibility. If it is included in the operation, the return to the printable state can be started together with the operation of closing the print medium loading unit, and the printable state can be quickly returned.

  In addition, a print operation of received print data that is determined to be normally printed when returning to the operable state may be started by a print restart command from an external device. In this way, printing can be resumed after setting update by a setting command from an external device such as a host computer, etc., without immediately restarting printing even after the error elimination processing to the printer body is completed. Thus, it is possible to prevent printing failure due to incompatibility between the paper setting of the printer main body and the loaded printing medium.

  Further, in the present invention, the printing of the print data is interrupted at a predetermined position in the middle of the printing content due to the shift to the operation stop state, and the interrupted print data is normally restored when returning to the operation enable state. If it is determined that printing is possible, the printing operation of the print data may be resumed from the position where printing is interrupted. In this way, it is possible to print only the unprinted print contents in the print data for which printing has been interrupted, so that wasteful consumption of the print medium due to reprinting of the already printed contents can be suppressed.

  Alternatively, in the present invention, printing of the print data is interrupted in the middle of the print contents to the standard print area due to the transition to the operation stop state, and the interrupted print data is restored when returning to the operable state. If it is determined that the printing can be normally performed, the printing operation of the print data may be resumed from the top position of the printing area where printing is interrupted. In this way, when printing in a standard print area such as a standard sheet or label, printing can be resumed from a sheet or label that has been printed halfway through a transaction or the like and has been interrupted. Only necessary parts can be reprinted on a sheet or label basis.

  Next, the printer of the present invention is characterized in that printing or / and discarding of received print data that has not been printed at the time of shifting to the operation stop state is performed by the above-described printer control method.

  According to the present invention, it is possible to suppress wasteful consumption of consumables such as print media and ink due to the fact that received print data that has not been printed cannot be printed normally after returning from the operation stop state. In addition, since print data that is expected to be printed normally is printed as it is, it is possible to minimize the effort required for normal reprinting.

  Embodiments of a roll paper printer of the present invention will be described below with reference to the drawings.

(overall structure)
FIG. 1 is an external perspective view of an ink jet type roll paper printer to which the present invention is applied, and FIG. 2 is an external perspective view of the roll paper printer with the open / close lid fully opened. The roll paper printer 1 includes a printer main body 2 having a substantially rectangular parallelepiped shape as a whole, and an opening / closing lid 3 attached to the front surface of the printer main body 2. A discharge port 4 having a predetermined width is formed on the front surface of the outer case 2 a of the printer body 2. A paper discharge guide 5 protrudes forward below the discharge port 4, and a lid opening / closing lever 6 is disposed on the side of the paper discharge guide 5. A rectangular opening 2b for inserting and removing roll paper is formed below the paper discharge guide 5 and the lid opening / closing lever 6 in the outer case 2a. The opening 2b is sealed by the opening / closing lid 3.

  When the lid opening / closing lever 6 is operated, the opening / closing lid 3 is unlocked. When the paper discharge guide 5 is pulled forward after unlocking, the opening / closing lid 3 pivots forward about its lower end and opens until it is almost horizontal. When the opening / closing lid 3 is opened, as shown in FIG. 2, the roll paper storage unit 11 (printing medium loading unit) formed inside the printer is opened. At the same time, the conveyance path A (see FIG. 3) from the roll paper storage unit 11 to the discharge port 4 is opened, and the roll paper 12 can be easily replaced from the front of the printer. In FIG. 2, the opening / closing lid 3 and the lid opening / closing lever 6 are omitted.

  An open / close detector 3 a is attached in the vicinity of the open / close lid 3. The open / close detector 3a includes a photo sensor, a magnetic sensor, a micro switch, and the like. The open / close detector 3a can detect that the open / close lid 3 has been switched from the open state to the closed state, and that the open / close lid 3 has been switched from the closed state to the open state.

  An error lamp (not shown) for notifying various errors in the roll paper printer 1 is attached to a predetermined position of the outer case 2a. A plurality of error lamps can be provided in association with the type of error. For example, the error lamp is loaded in the roll paper storage unit 11 that notifies the cover open error state in which the open / close lid 3 is open. The lamp that is turned on when the roll paper 12 is used up, and the paper type of the recording paper 12a on the conveyance path A is different from the paper type specified by the setting data stored in the roll paper printer 1 or the received print data. There are a lamp that lights when the paper jam occurs, a lamp that lights when a paper jam occurs, and an error lamp that lights when other normal printing is difficult. In addition, you may attach the buzzer for alert | reporting an error state with a sound at the time of error occurrence.

  FIG. 3 is an explanatory diagram showing a schematic configuration inside the roll paper printer 1. A roll paper 12 is stored in the roll paper storage unit 11 so as to be able to roll in a horizontal state facing the printer width direction. The roll paper 12 is obtained by winding a long recording paper 12a having a constant width in a roll shape.

  A head unit frame 13 attached horizontally to the upper end of the printer main body frame 10 is disposed above the roll paper storage unit 11. In the head unit frame 13, an inkjet head 14, a carriage 15 on which the inkjet head 14 is mounted, and a carriage guide shaft 16 that guides the movement of the carriage 15 in the printer width direction are arranged. The inkjet head 14 is mounted on the carriage 15 so that the ink nozzle surface 14a faces downward. A carriage conveyance mechanism including a carriage motor 17 and a timing belt 18 for reciprocating the carriage 15 along the carriage guide shaft 16 is disposed above the roll paper storage unit 11.

  A platen 19 that extends horizontally in the width direction of the printer is disposed below the inkjet head 14 so as to face the ink nozzle surface 14a with a certain gap therebetween, and the printing position of the inkjet head 14 is defined by the platen 19. . A tension guide 20 that is curved downward is attached to the rear end of the platen 19.

  On the rear side of the platen 19 (upstream in the transport direction), a rear paper feed roller 21 and a rear paper press roller 22 are horizontally stretched in the printer width direction. A rear paper pressing roller 22 is pressed against the rear paper feeding roller 21 from above with a predetermined pressing force via the recording paper 12a. A front paper feed roller 23 and a front paper press roller 24 are arranged on the front end side (downstream side in the transport direction) of the platen 19. A front paper pressing roller 24 is pressed against the front paper feeding roller 23 from above via the recording paper 12a. The rear paper feed roller 21 and the front paper feed roller 23 are rotationally driven in synchronization by a paper feed motor 25 mounted on the printer main body frame 10.

  A paper detector 26 is disposed upstream of the inkjet head 14 in the transport path A. The paper detector 26 is constituted by a reflection type photosensor or a transmission type photosensor, and the presence or absence of the recording paper 12a is detected by using reflected light or transmitted light from the recording paper 12a drawn on the conveyance path A. , And the paper type of the recording paper 12a is detected.

  The recording paper 12a fed out from the roll paper 12 in the roll paper storage unit 11 is transported through a printing path A on the platen 19 in a state where a predetermined tension is applied by the tension guide 20 (the thick paper shown in FIG. 3). It is conveyed along the alternate long and short dash line) and set in a state of being pulled out from the discharge port 4. When the paper feed motor 25 is driven and controlled in this state, the rear paper feed roller 21 and the front paper feed roller 23 are rotated, and the recording paper 12a is fed by a constant transport amount. Then, the inkjet head 14 is driven in synchronization with the paper feed of the recording paper 12a, and printing is performed on the surface of the recording paper 12a passing through the printing position. Thereafter, the conveyance is stopped in a state where the printed recording paper 12a is discharged from the discharge port 4, and the leading end portion of the recording paper 12a is cut by the auto cutter 28 arranged in the vicinity of the discharge port 4, so that the printed recording is completed. A piece of paper is issued.

(Control system)
FIG. 4 is a schematic block diagram showing a control system of the roll paper printer 1. The control system of the roll paper printer 1 is mainly configured by a control unit 30 including a CPU, a ROM, a RAM, and the like. The control unit 30 is connected to a nonvolatile memory 33 such as a flash ROM. Print data and commands are supplied to the control unit 30 from a host device such as the host device 32 via the transmission / reception unit 31. Based on a print command from the host device 32 or the like, the control unit 30 controls the drive of each unit such as a paper feed mechanism that feeds roll paper and a carriage transport mechanism, and executes a paper feed operation and a print operation.

  The inkjet head 14 is connected to the output side of the control unit 30 via a head driver 14b, and the control unit 30 drives and controls the inkjet head 14 via the head driver 14b. The output side of the control unit 30 is connected to the carriage motor 17 and the paper feed motor 25 via the motor driver 17a and the motor driver 25a. The control unit 30 feeds the paper via the motor drivers 25a and 17a. The motor 25 and the carriage motor 17 are driven and controlled. The control unit 30 calculates a predetermined transport amount of the recording paper 12a by accumulating the number of steps or the rotation amount for driving and controlling the paper feed motor 25 in the feed direction.

  The roll paper printer 1 is a label paper that is attached to the surface of a long peeling mount in a state where the labels can be peeled at regular intervals, and a black indicating a printing reference position at a predetermined position on each label of the label paper. Printing on various types of recording paper, such as labeled paper with a mark, continuous paper with a mark that is not a label paper, and plain continuous paper without a mark, is possible. In addition, label paper and mark paper can be printed on various types of recording paper having different layouts and dimensions of labels and marks. Further, even a plain continuous paper can be printed on various types of recording paper having different paper qualities. Furthermore, it is possible to print on recording papers in which the paper width and label width of these recording papers are appropriately changed.

  Therefore, the control unit 30 of the roll paper printer 1 matches the type of recording paper 12a constituting the roll paper 12 loaded in the roll paper storage unit 11 (various specifications such as label and mark arrangement, paper quality, and paper width). Thus, sheet setting information for controlling the printing position, the ink discharge amount, and the like is held. In other words, the non-volatile memory 33 of the roll paper printer 1 stores in advance various types of paper setting information corresponding to the various types of recording paper 12a that can be printed by the roll paper printer 1.

  An open / close detector 3 a and a paper detector 26 are connected to the input side of the control unit 30. When the open / close detector 3a detects that the open / close lid 3 is closed, the control unit 30 determines the type of paper loaded in the roll paper storage unit 11 based on the detection output of the paper detector 26. I do. For example, a predetermined amount of the recording paper 12a drawn from the roll paper 12 and loaded on the conveyance path A is conveyed, and the type of the recording paper 12a is determined based on the detection output of the paper detector 26 being conveyed. . Then, the control unit 30 can read out the corresponding sheet setting information based on the determined sheet type and control each unit of the roll paper printer 1 to perform an optimal printing operation on each sheet. The paper detector 26 can also determine the type and size of the paper by detecting the presence or absence of the paper, the length of the paper, the length of the label, the distance between marks marked on the paper, and the like. In addition, the paper width can be detected by scanning the carriage 15 with an optical sensor (not shown) mounted on the carriage 15. Further, an encoder (not shown) mounted on the carriage 15 can detect that the carriage 15 is locked and a paper jam has occurred. The control unit 30 can also perform optimum print control and error control based on these.

  Further, the control unit 30 determines an error state of the roll paper printer 1 based on the detection outputs of these detectors. That is, the control unit 30 determines that it is in the cover open error state when the open / close detector 3a detects that the open / close lid 3 is not closed. If the recording paper 12a is not detected by the paper detector 26, it is determined that the paper is out of paper. Whether or not the paper type of the recording paper 12a determined by the paper determination operation matches the paper type specified in the setting data stored in the roll paper printer 1 or the received print data. A determination is made, and if they do not match, it is determined that the paper type is different. Then, based on the detection results such as the conveyance speed of the recording paper 12a and the load of the paper feed motor 25, it is determined whether or not the paper jam state. In addition, whether there is an error that prevents normal printing from being performed based on detection results such as the open / closed state of the ink cartridge housing cover (not shown), the installed state of the ink cartridge, the ink out condition, and the amount of waste ink in the waste liquid tank. Can be determined.

(Return control from operation stop state to operation enable state)
Next, the control performed when the roll paper printer 1 is returned from the print stop state (operation stop state) to the printable state (operation enable state) when an error occurs will be described.

  As described above, when the control unit 30 detects various error states such as a cover open error in which the open / close lid 3 is open, a paper out error, a paper type error, a paper jam error, or other errors, the printing operation is performed. In addition to stopping, the occurrence of an error is notified to the user by an error lamp or the like. After this notification, when a cover closing operation for switching the open / close lid 3 from the open state to the closed state is detected, each part of the roll paper printer 1 is controlled so as to resume the printing operation that has been interrupted by returning from the error state. .

  FIG. 5 is a flowchart of the return control to the operable state triggered by the cover closing operation. In this process, when the roll paper printer 1 is in an error occurrence state, the operator opens the open / close lid 3 and performs a process for recovering from the error. (Operation) is detected as a trigger. Here, in the reception buffer and image buffer of the roll paper printer 1 in the error occurrence state, uncompleted print data that has not been printed among the received print data (print data in the print suspended state and print wait state). Status print data) is stored and held.

  In steps S1 to S2, the control unit 30 performs a sheet determination operation for the recording sheet 12a loaded in the roll sheet storage unit 11. First, in step S1, the presence or absence of the recording paper 12a on the conveyance path A is determined by the paper detector 26, and when the recording paper 12a is not detected, it is determined that there is no paper error (step S1: No). The error state is entered again. On the other hand, when the recording sheet 12a is detected, it is determined that there is a sheet (step S1: Yes), and the process proceeds to step S2. Then, it is determined what type of recording paper 12a is currently loaded.

  Subsequently, in steps S3 to S4, the paper type of the currently loaded recording paper 12a determined in step S2 matches the paper type specified as the print target in the incomplete print data stored in the reception buffer. It is determined whether or not to do. First, in step S3, it is determined whether or not the paper size (paper width, print area size, etc.) of the recording paper 12a being loaded matches the designated recording paper 12a. If it is determined that the paper sizes do not match (step S3: No), it is determined that a paper size error has occurred, and the process proceeds to step S6 described later.

  On the other hand, when it is determined in step S3 that the paper sizes match (step S3: Yes), the process proceeds to step S4, and the paper type of the recording paper 12a designated as the recording paper 12a being loaded (whether continuous paper or not) No., whether it is label paper, and the shape of the label, the presence or absence of a mark such as a black mark or notch, etc.) are determined. If it is determined that the paper types do not match (step S4: No), it is determined that there is a paper type difference error, and the process proceeds to step S6 described later.

  If it is determined in step S4 that the paper types also match (step S4: Yes), the process proceeds to step S5. In this case, the control unit 30 determines that the recording paper 12a that can normally print unprinted print data is currently set in the roll paper printer 1, and currently stores and holds it in step S5. Start printing operation of unprinted print data.

  If it is determined in steps S3 and S4 that either the paper size or the paper type is different, the control unit 30 normally uses the unprinted print data stored and held in the recording paper 12a. In step S6, the currently held print data is erased from the reception buffer or image buffer and discarded. That is, in this case, unprinted print data currently held is discarded.

  Here, when a plurality of print data is stored and held as unprinted print data, the control unit 30 performs the determination of steps S3 to S4 for each print data, and loads the print data into the current loading data. The recording sheet 12a is sorted into one that can be normally printed and one that is not normally printable. Then, only the print data that cannot be printed normally is erased from the buffer and discarded in step S6, and the print data that can be printed normally is left to be reprinted in step S5.

  In this way, since the paper that cannot be printed normally is not automatically reprinted when returning from the operation stop state, wasteful consumption of the recording paper 12a and ink can be suppressed, and the printed matter that is not wasted. Can only create. In addition, since print data that is expected to be printed normally is printed as it is, it is possible to minimize the effort required for normal reprinting.

  In addition, a cover closing operation for closing the open / close lid 3 is performed at the end of the measures for returning from the error state related to the paper (for example, replacement work or replenishment work of the recording paper 12a, work for removing the paper jam). Therefore, the return to the printable state and the reprinting can be started simultaneously with the completion of the treatment for removing the cause of the error. Therefore, quick return is possible.

  Of the unprinted print data, the print data in the print suspended state may be controlled to resume printing from the suspended position. At this time, in the case of non-standard print data such as a receipt in which the length of the printed matter changes according to the print content, printing may be started as it is from the interruption position, but a standard sheet or label is printed. The size of the print area is set in advance, as in the case of printing in sheet units, or in the case of print data to be printed on a standard label, printing is started from the beginning of the sheet or label where printing was interrupted. Each unit of the roll paper printer 1 may be controlled to start. In this way, wasteful consumption of the print medium due to reprinting of the already printed content can be suppressed to the maximum, and only the minimum necessary portion can be reprinted in sheet units or label units.

(Modification example)
(1) In the above embodiment, the cover closing operation is used as a trigger to perform not only the paper determination operation but also the reprint execution start or the print data read-out. Until the paper discrimination operation and whether or not the unprinted print data can be printed normally, or until the print data that cannot be reprinted is discarded, a print restart command is issued from the host device 32 after the cover close operation. The printing operation may be resumed by receiving.

  Alternatively, only the paper discrimination operation is performed using the cover close operation as a trigger. After the cover close operation, the setting change command of the roll paper printer 1 is sent from the host device 32 to change the print setting, and then the print setting after the change is made. To determine whether it is possible to normally print unprinted print data on the currently loaded recording paper 12a. If it is determined that printing is possible, reprinting is started and printing is performed normally. If it is determined that this is not possible, the print data may be discarded.

(2) In the above embodiment, whether or not unprinted print data can be printed normally is determined by focusing only on the mismatch or mismatch of the paper type. The determination may be added. For example, arbitrary conditions that affect the printing operation and paper feeding operation among the states of the roll paper printer 1 such as ink outage determination, waste ink amount determination, ink leakage, nozzle clogging, and head temperature abnormality. You may make it perform determination of.

(3) In the above embodiment, whether or not printing is possible when resuming printing is determined based on whether or not the paper types match, that is, whether or not normal printing can be performed as specified by the print data. Inconsistencies such as layout and color may be allowed, and printing may be executed when it is determined that all the print contents can be printed.

(4) In the above embodiment, whether or not normal printing is possible for all unprinted print data, that is, whether or not reprinting is possible is determined. However, depending on the type of print data, reprinting is possible. You may divide whether to judge whether it is possible. Alternatively, for each print data, it may be set on the driver screen of the host device 32 whether or not to perform reprinting individually. Further, the setting of the print resumption position such as whether reprinting is performed in units of pages or from the interruption position may be set according to the type of print data or individually for each print data.

(5) The above embodiment is an example in which the present invention is applied to the roll paper printer 1 loaded with roll paper. However, the present invention is a printer that prints on a sheet that has been cut into a fixed form, or a state in which a continuous form is folded. This can be applied to a printer that prints on a continuous form set in the above.

1 is an external perspective view of a roll paper printer to which the present invention is applied. FIG. 3 is an external perspective view of the roll paper printer with the open / close lid fully opened. FIG. 3 is an explanatory diagram illustrating a schematic configuration inside a roll paper printer. FIG. 2 is a schematic block diagram illustrating a control system of a roll paper printer. It is a flowchart of return control to an operable state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Roll paper printer, 2 ... Printer main body, 2a ... Exterior case, 2b ... Opening part, 3 ... Opening / closing lid, 3a ... Opening / closing detector, 4 ... Discharge port, 5 ... Discharge guide, 6 ... Cover opening / closing lever, 10 ... Printer body frame, 11 ... roll paper storage unit (printing medium loading unit), 12 ... roll paper, 12a ... recording paper (printing medium), 13 ... head unit frame, 14 ... ink jet head, 14a ... ink nozzle surface, 14b ... head driver, 15 ... carriage, 16 ... carriage guide shaft, 17 ... carriage motor, 17a ... motor driver, 18 ... timing belt, 19 ... platen, 20 ... tension guide, 21 ... rear paper feed roller, 22 ... rear side Paper press roller, 23... Front paper feed roller, 24... Front paper press roller, 25. Paper feed motor, 25 a. Paper detector, 28 ... automatic paper cutter, 30 ... controller, 31 ... transceiver unit, 32 ... host device, 33 ... nonvolatile memory, A ... conveyance path

Claims (8)

When a predetermined error state is detected, the state shifts to an operation stop state, and waits until a predetermined return process for eliminating the error state is performed,
When the return process is performed, it returns to the operable state, and determines whether or not the received print data that has not been printed at the time of shifting to the operation stop state can be normally printed,
When it is determined that printing can be performed normally, the printing operation of the print data is started,
A printer control method, comprising: discarding print data when it is determined that printing cannot be performed normally. The printer control method according to claim 1, comprising:
When a plurality of received print data for which printing has not been completed is stored at the time of transition to the operation stop state,
Determining whether each of the plurality of print data can be normally printed;
A method for controlling a printer, comprising: discarding the print data determined not to be normally printed from the plurality of print data, and starting a printing operation of the print data determined to be normally printed . A method for controlling a printer according to claim 1, wherein:
When the return processing is performed, whether the print medium loaded in the print medium loading unit when returning to the operable state matches the print medium to be printed in the received print data Determine whether or not
When it is determined that they match, the printing operation of the print data is started,
A printer control method comprising: discarding the print data when it is determined that they do not match. A method for controlling a printer according to claim 1, wherein:
The printer control method according to claim 1, wherein the returning process includes a process of detecting a cover close for closing an open / close cover for opening and closing the print medium loading unit. A printer control method according to any one of claims 1 to 4, comprising:
A printer control method, comprising: starting a print operation of received print data that has been determined to be normally printed when returning to the operable state, in response to a print restart command from an external device. A printer control method according to any one of claims 1 to 5, comprising:
When it is determined that printing of the print data is interrupted at a predetermined position in the middle of the print content due to the transition to the operation stop state, and the interrupted print data can be normally printed when returning to the operation enable state. Is
A method for controlling a printer, wherein the printing operation of the print data is resumed from a position where printing is interrupted. A printer control method according to any one of claims 1 to 5, comprising:
The printing of the print data is interrupted in the middle of the print contents to the standard print area by shifting to the operation stop state, and the interrupted print data can be normally printed when returning to the operation enable state. If judged,
A method for controlling a printer, wherein the printing operation of the print data is resumed from the start position of the print area where printing is interrupted.   8. A printer according to claim 1, wherein printing or / and discarding of received print data that has not been printed at the time of shifting to the operation stop state is performed.

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