JP2002264414A - Printer and method for processing error of printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To assure that an output of a sensor for detecting when an access cover is opened is made earlier than an output of a sensor for detecting the presence/absence of papers in a printer. SOLUTION: The printer 10 is provided with an opening detection mechanism CO for outputting a detection signal in accordance with opening/closure of the cover 18 to a housing 12, and a paper detection mechanism PE for detecting the presence/absence of papers. A delay means is set for delaying an output of the paper detection mechanism PE so that an output of the opening detection mechanism CO is transmitted earlier than the output of the paper detection mechanism PE to a printing control part 101 when the cover is opened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer for printing on roll paper stored in a housing, and more particularly, to the presence / absence of roll paper stored in a housing and an open / close state of a cover enabling the storage of the roll paper. The present invention relates to a printer provided with a function of detecting a printer.

[0002]

2. Description of the Related Art There is known a printer generally called a roll paper printer, which has a holder for accommodating roll paper in a housing and performs printing on a paper surface drawn from the roll paper contained in the holder. Roll paper printers do not require replenishment of paper for a long period of time, and are suitably employed as printers used with cash registers and the like. The roll paper printer is provided with an opening / closing cover that opens or closes a part of the holder for storing the roll paper, and by opening the opening / closing cover, an operator can put the roll paper into the holder. Like that.

[0003] A typical conventional roll paper printer, like other general printers, has several status sensors for notifying an operator of the internal status thereof. Includes a cover open / close sensor for detecting the state of the open / close cover, that is, whether the cover is open or closed, and a roll paper detection sensor for detecting the presence or absence of roll paper in the holder.

The cover opening / closing sensor includes, for example, an optical sensor, a magnetic sensor, and a microswitch arranged near the open end of the opening / closing cover. region)
Detects changes in the amount of received light, magnetic flux, and the on / off state of a switch, which accompanies movement during opening and closing of the switch. Further, the roll paper detection sensor is configured to include, for example, an optical sensor or a microswitch arranged near the roll paper holder or in the vicinity thereof.・ Detects off.

[0005]

On the other hand, in a certain kind of roll paper printer, the two sensors are provided near the open end of the opening / closing cover in order to efficiently route the wiring to the control board. There is a configuration that is arranged close to the. In the printer having such a configuration, the detection of the roll paper is performed in the area where the roll paper is pulled out.
When the opening / closing cover is opened, the drawn-out area moves with the opening, and the detection by the roll paper sensor is
If the detection is performed before the detection by the cover opening / closing sensor, the detection is erroneous, and there is a problem that the operator is erroneously notified. Regardless of the error (cover open, out of paper), a problem will occur if the printing process is continued, so it will be treated as an error without specifying the cause, and the printing process will be stopped or the subsequent printing process Although it is possible to prohibit the error, especially in a POS printer, it is necessary to accurately notify the operator which error has occurred in order to suggest the next operation to the operator.

Accordingly, an object of the present invention is to assure that in a printer of this type, when the opening / closing cover is opened, the output of the sensor for detecting the opening is earlier than the output of the sensor for detecting the presence / absence of paper. An object of the present invention is to provide a printer having a configuration.

[0007]

In order to achieve the above object, a printer according to the present invention is provided with a holder for accommodating paper, and is attached to the holder so as to be openable and closable, and can be loaded with paper in the holder when opened. Forming a state, a cover for covering the holder containing the paper when closed, a printing mechanism for transporting and printing the paper, and a print controller for controlling the printing mechanism and performing a printing process; An open / close detection mechanism for detecting that the cover is open, a paper detection mechanism for detecting that the paper has run out, and an output of the paper detection mechanism generated by the operation of opening the cover. And a delay unit that transmits the output to the print control unit after the output of the print control unit.

In the above configuration, when the cover is opened,
The output from the open / close detection mechanism for detecting the opening is guaranteed to be obtained before the output from the paper detection mechanism for detecting the presence / absence of paper, thereby preventing erroneous detection when the cover is opened. .

[0009] The printer of the present invention includes a frame for supporting the holder, wherein the printing mechanism is mounted on one of the frame or the cover and on the other of the frame or the cover. The present invention is suitably applied to a printer that includes a platen, and when the cover is closed, the platen is in contact with the print head or faces the print head with a certain gap, and performs printing on paper guided therebetween.

For example, the opening / closing detection mechanism includes a first lever that moves with the opening and closing of the cover, and a first lever that moves with the opening and closing of the cover.
And a sheet detecting mechanism that moves with the opening and closing of the cover, and further, the sheet that is accommodated in the holder regardless of whether the cover is opened or closed. And a second detector that detects the movement of the second lever that can be moved even when the error has disappeared. In this case, the first and second
Are preferably arranged in a state where they are arranged in a direction substantially perpendicular to the paper transport direction.

For example, a delay circuit that delays the output of the paper detection mechanism and transmits the output to the print control unit can be employed as the delay unit.

[0012] Further, as a delay means, a timing section for starting timing when the output of the paper detecting mechanism is detected, and an output of the opening / closing detecting mechanism within a predetermined time after the timing section starts timing. When the detection is detected, a first interrupt process is performed prior to the print process performed by the print control unit. When the output of the open / close detection mechanism is not detected within the predetermined time, the first interrupt process is performed. An apparatus having an interrupt processing unit for performing a different second interrupt processing may be employed.

[0013] In the above configuration, the interrupt processing unit may include:
Prior to the output of the paper detection mechanism, when the output of the open / close detection mechanism is detected, the first interrupt processing is performed, and the output of the paper detection mechanism is detected prior to the output of the open / close detection mechanism. It is preferable that the timing be started when the time has elapsed.

In this case, the user is notified that the cover is open by the first interrupt processing performed by the interrupt processing section, and the absence of the paper is determined by the second interrupt processing. It is preferable that the user be notified so that the printing process of the print control unit is stopped or prohibited by either the first interrupt process or the second interrupt process.

An error processing method for a printer according to the present invention is characterized in that a holder for accommodating paper and a holder which is attached to the holder so as to be openable and closable so that paper can be loaded in the holder when opened and when closed. A cover for covering the holder accommodating the paper, a printing mechanism for transporting and printing the paper, a printing control unit for controlling the printing mechanism and performing a printing process, and the cover is open. In a printer error handling method provided with an opening / closing detection mechanism for detecting that the paper is out, and a paper detection mechanism for detecting that the paper has run out, timing is started when an output of the paper detection mechanism is detected. Then, when the output of the opening / closing detection mechanism is detected within a predetermined time after the start of the timing, a first interrupt process is performed prior to the printing process, and the opening / closing detection is performed within the predetermined time. When the output of the structure is not detected, it configured to include a step of performing a different second interrupt processing from the first interruption process.

In the above configuration, when the output of the open / close detection mechanism is detected prior to the output of the paper detection mechanism, the first interrupt processing is performed, and prior to the output of the open / close detection mechanism, It is preferable that the timing be started when the output of the paper detecting mechanism is detected.

Further, in the above-mentioned configuration, it is preferable that the first interrupt processing is one of the following or a combination thereof. Notifying the host connected to the printer of the cover open error; Notifying the user of the cover open error using the notification means provided in the printer.

Further, it is preferable that the second interrupt processing is one of the following or a combination thereof. Notifying the host connected to the printer of the paper end error; Notifying the user of the paper end error using the notification means provided in the printer.

It is preferable that each of the first interrupt processing and the second interrupt processing includes a step of stopping or inhibiting the printing processing.

Further, the predetermined time is set to a value smaller than L / v, which is a ratio of the distance L from the printing position of the printing mechanism section to the detection position of the paper detecting mechanism and the paper transport speed v. Is preferred.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (Overall Structure of Printer) An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an external perspective view showing an example of a printer to which the present invention is applied.
FIG. 2 is an external perspective view corresponding to FIG. 1 in a state where the opening / closing cover is opened. The printer 10 shown in the figure performs printing by an ink jet method, and here, a functional component for printing is mounted on a frame member (not shown).
The housing 12 is formed by externally covering this with a case member made of, for example, plastic.

As shown in FIG. 2, a space 14 for accommodating roll paper is formed in the housing 12, and a holder 14b for holding the roll paper at a predetermined position is formed in this space. Is provided. The paper end of the roll paper R is sent out from the paper discharge unit 16 disposed on the front side and provided to the operator. As will be described later, a lower portion of the sheet discharge section 16 is configured as an opening / closing cover 18, and the roll paper storage space 14 is opened by opening the cover 18 forward. The opening allows the operator to access the storage space 14, and in this state, the operator puts the roll paper R into the holder 14 b in the space 14. Openable cover 18
Is configured such that its lower end is pivotally supported by the housing 12 and its upper end can be opened to the front.
When the opening / closing cover 18 is closed, the paper end of the roll paper R supported by the
And is provided to the paper discharge unit 16. The printer 10 includes an ink cartridge storage unit 15.
The door 17 is opened and the ink cartridge is mounted here.

FIGS. 3 and 4 are perspective views showing the internal structure of the printer 10 around the roll paper storage space in the printer 10.
8 shows the closed state and the open / close cover opened. FIG. 5 is a side view showing the internal structure when the opening / closing cover 18 is closed. In these figures, the storage space 14 for the roll paper R is formed by the frame member 22 on the housing 12 side. Storage space 14
Is provided with a holder 14b for supporting roll paper. An opening / closing cover 18 is mounted on the front side of the holder 14b.

The opening / closing cover 18 is formed by covering the outer surface of the frame member 24 with a case member 26 made of, for example, plastic. (The case member 26 is omitted in FIG. 5.) The open / close cover 18 is rotatably supported by the frame member 22 and supports the transport roller unit 28 so as to be movable. It is opened and closed in conjunction with the operation of).

The transport roller unit 28 includes an auxiliary roller 32, a drive roller 34, and a plate-shaped platen 36 on the transport surface. With the opening / closing cover 18 closed with respect to the housing 12, the auxiliary roller 32 and the driving roller 34 are driven by the driving roller 38 and the auxiliary roller 40 installed on the housing 12 side.
(See FIG. 5), and the roll paper can be conveyed therebetween. A paper feed motor (not shown) is attached to the frame member 22 on the housing side, and the driving force of the paper feed motor is transmitted to the drive roller 38 on the housing 12 side by a transmission mechanism including a gear train (not shown). Is done. The transport roller unit 28 is provided with a gear train 34 a for transmitting a driving force to the driving roller 34. With the opening / closing cover 18 closed with respect to the housing 12, one of the gears constituting the transmission mechanism on the housing 12 meshes with one of the gears of the gear train 34a, and the driving force of the paper feed motor is reduced by the driving roller. 34. When the cover 18 is closed, the platen 36 faces the print head 42 and the print head 42
Enables printing on the roll paper R. As the print head, an ink jet type or a wire dot type head can be adopted, and the platen 36 faces the print head 42 with a certain gap in a state where the opening / closing cover 18 is closed. A thermal head may be used as the print head. In this case, a roller platen is used instead of the platen platen.
When the platen 8 is closed, the platen needs to be configured so as to be in contact with and facing the print head.

The transport roller unit 28 includes a shaft 28a,
A shaft 28b is provided. The lower end of the frame member 24 is supported by the shaft 28c of the frame member 22 on the housing side, and the upper end of the frame member 24 is the shaft 2c of the transport roller unit 28.
8a so as to be rotatable. On the other hand, connecting rod 3
0 is the axis 2 of the frame member 22 on the housing side at the lower end side.
8d, and the upper end is rotatably attached to a shaft 28b of the transport roller unit 28. That is, the frame member 24, the connecting rod 30, and the shaft 2 connecting these to the frame member 22 and the transport roller unit 28.
The four-bar link mechanism 70 is constituted by 8a to 8d. The transport roller unit 28 supported by the four-bar link mechanism 70 is moved while maintaining a substantially horizontal state as the opening / closing cover 18 opens and closes.

On the opening / closing cover 18 side, a metal operating plate 44 is further provided so as to overlap with the transport roller unit 28, and includes an opening / closing operation lever 46, a pair of lock claws 48 and a paper guide. The plate 50 is formed integrally. The operation plate 44 is connected to the shaft 28 of the transport roller unit 28.
b and the locking claw 48 at the tip thereof is engaged with the groove 2 of the frame member 22 of the housing in a state where the opening / closing cover 18 is closed.
2a. In order to maintain the engagement of the lock claw 48 when the opening / closing cover 18 is closed, the operating plate 44 is constantly urged clockwise in the drawing by a spring or other urging means (not shown). Opening and closing operation lever 4 against the urging force of the spring
6 is slightly lifted upward, the operation plate 44 is moved to the shaft 28b.
, The lock pawl 48 is disengaged from the groove 22a, and the opening / closing cover 18 can be opened. In the present embodiment, the opening / closing operation lever 4
6 is integrated with the paper discharge unit 16, so that the operator can perform the operation by lifting the paper discharge unit 16 upward.

The paper guide plate 50 formed on the operation plate 44
Is located further upstream of the auxiliary roller 32 on the upstream side of the transport roller unit 28 and extends from below. The paper guide plate 50 is a guide member for guiding the paper r pulled out from the roll paper R in the storage space 14 to the transport surface of the transport roller unit 28, and is pulled out from the roll paper R as shown in FIG. The paper r is routed so as to cover the paper guide plate 50, thereby changing its course and being guided between the auxiliary roller 32 and the drive roller 38. By operating the opening / closing operation lever 46 when the opening / closing cover 18 is opened, the paper guide plate 50
8 together with the transport roller unit 28, so that the trajectory does not hit the drive roller 38 on the housing 12 side. As shown in FIGS. 3 and 4, a notch 50 a is formed at a substantially central position in the width direction of the paper guide plate 50, and corresponds to a tip position of one swing lever 54 described later. .

(Cover Open / Close Detection / Paper Detection Mechanism) The printer 10 according to the present invention further includes a mechanism (hereinafter, referred to as an open / close detection mechanism CO) for detecting whether or not the open / close cover 18 is open. A mechanism for detecting whether or not the roll paper remains in the holder a14 (hereinafter, referred to as a paper detection mechanism PE) is provided. Hereinafter, the configuration of each of these mechanisms will be described. In the description, FIG. 6 to FIG. 8 in which main parts of FIG. 5 are enlarged in addition to FIG. 3 to FIG.

As shown in these figures, the printer 10
Two rocking levers 52, 54 and 2 arranged in the depth direction on the upper part of the roll paper storage space 14.
And two micro switches 56 and 58. Each swing lever and each micro switch have the same configuration, and include one swing lever 52 and one micro switch 56 (front side in the figure), and include the open / close detection mechanism CO.
The paper detection mechanism PE is configured to include the other swing lever 54 and the other micro switch 58 (the back side in the figure).

Each of the swing levers 52 and 54 is formed of an elastic material such as plastic, for example, and, as shown particularly clearly in FIG. The front end 52a (54a) and the rear end 52b (54b) are pivotally supported by the mounting portion 22b, and can swing. In the state where the opening / closing cover 18 is closed, the tips 52 a and 54 a of the swing lever are directed toward the surface of the paper guide plate 50. In a state where the paper r is placed on the paper guide plate 50 as shown in FIG. 6, the tips 52a and 54a of the respective swing levers come into contact with the paper r and are pushed upward by the pressing force of the paper guide plate 50. Being lifted. In addition, since the sheet r on the paper guide plate 50 is pressed from above by the resistance of the swing levers 52 and 54 against this force, the swing levers 52 and 54 prevent the sheet r from rising in the present embodiment. It functions as a paper holder.

At the rear end 52b and 54b side of each swing lever of the detector mounting portion 22b, the micro switch 56 is provided.
And 58 are installed, and in this state, the button portions 56a and 58a are in a state of being pressed down by the operation surfaces 52c and 54c. Note that the printer 1
A control board constituting a control unit 100 described later is built in the microcontroller 0. Wirings for transmitting detection signals are drawn out from the microswitches 56 and 58, and are connected to the control board.

In order to open the opening / closing cover 18 from this state, as shown in FIG. 7, when the opening / closing operation lever 46 is lifted upward, the paper guide plate 50 is moved to the operating plate 4.
4 lowers by rotation. As a result, the swing levers 52 and 54 rotate clockwise in the drawing, and their operation surfaces 52c and 54c
Buttons 56a, 58a. As a result, the state of the microswitch 56 constituting the opening / closing detection mechanism CO changes, and the detection signal is transmitted to the control board side. At substantially the same time, the detection signal from the microswitch 58 constituting the paper detection mechanism PE is outputted. Is sent.

On the other hand, as shown in FIGS. 3 and 4, a notch 50a is formed in the paper guide plate 50 corresponding to the tip position of the swing lever 54 constituting the paper detection mechanism CO. As shown in FIG. 8, even when the opening / closing cover 18 is closed, the tip 54 a of the swing lever 54 has the notch 50
a, and as a result, the swing lever 54 is rotated clockwise, and the operation surface 54 c
Deviate from 8. As a result, a detection signal is transmitted from the micro switch 58 constituting the paper detection mechanism PE.
Although a microswitch is used to configure each detection mechanism, another detection element, for example, an optical sensor may be used to detect the movement of the swing lever. Other specific shapes and installation modes of the swing lever can be adopted.

(Control Unit of Printer) FIG. 9 is a block diagram showing a main part of the printer in this embodiment. The printer 10 mainly includes a printing mechanism unit 200 and a control unit 100.
And prints on paper according to a print command transmitted from the host 150. The printing mechanism unit 200 includes a print head 42, a paper feed motor 80 that conveys the paper, a carriage motor 90 that relatively moves a carriage on which the print head 42 is mounted with respect to the paper, and a roller, It includes a mechanism for transmitting to the carriage, a paper detection mechanism PE for detecting the presence or absence of paper, an open / close detection mechanism CO for detecting that the cover is open, and the like. For example, these mechanisms may be the mechanisms described in the printer described in the above-described embodiment, or may be the mechanisms generally used in known printers.

On the other hand, the control unit 100 includes a communication interface I / F for receiving a print command transmitted from the host 150, a print control unit for controlling the print mechanism unit 200 according to the print command, and mainly a print command. A storage unit 103 (RAM) for temporarily storing print data to be transmitted accompanying thereto; an interrupt processing unit 102 for performing an interrupt process in accordance with a signal output from the sheet detection mechanism PE and the open / close detection mechanism CO; A time keeping unit 104 that keeps time, an informing unit 105 that informs the user of the status of the printer (out of paper, opening and closing of the cover),
It comprises various drivers DR for driving the print head 42, the paper feed motor 80, the carriage motor 90 and the like.

Print control unit 101, interrupt processing unit 102
Is configured by a CPU and a program stored in a ROM in advance and executed by the CPU. The notification unit 105 may be, for example, a display device such as an LED provided on a panel of a printer, a liquid crystal, or an acoustic device such as a buzzer.

The operation of the printer according to this embodiment will be described below with reference to FIG. FIG. 10 illustrates the interrupt processing unit 102.
6 is a flowchart showing an interrupt process executed in step (a).
The interrupt processing unit 102 detects the presence or absence of the output of the sheet detection mechanism PE and the open / close detection mechanism CO. (Step S10,
S70) If there is no output for both, step S10,
The loop between S70 is repeated. When there is an output from the opening / closing detection mechanism CO (step S70), a first interrupt process described below is executed. That is, the notification unit 105 notifies the user that the cover is open (cover open error) (step S80), and simultaneously transmits an interrupt signal to the print control unit 102. The print control unit 102 that has received the interrupt signal processes the interrupt signal prior to the print processing. That is, the communication interface I /
A busy signal is transmitted from F to the host, and the interval between them is changed to offline. If the printing process is being performed at this time, the driving of the print head 42, the carriage motor 90, and the paper feed motor 80 is stopped.

On the other hand, if the output of the paper detecting mechanism PE is detected first, the timer 104 starts counting time (step S20). If the output of the opening / closing detection mechanism CO is detected before the predetermined waiting time α elapses (step S30), the notification unit 105 notifies a cover open error (first interrupt processing; step S8).
0). If the output of the opening / closing detection mechanism CO is not detected before the elapse of the waiting time α from the start of the timing (step S50), the second interrupt processing is executed. That is,
The notification unit 105 notifies the user that the paper has run out (paper end error). At this time, similarly to the first interrupt processing, the print processing is stopped, and the connection between the host 150 and the communication interface I / F is taken offline.

The notification unit 1 provided in the printer 10 itself
05, each error is notified (step S60,
S80) Alternatively, the error status may be transmitted to the host 150 via the communication interface I / F, and the host 150 may notify the user.

As described above, the first interrupt processing is immediately executed when the output of the opening / closing detection mechanism CO is output, but the second interrupt processing is immediately executed even when the output of the paper detection mechanism PE is output. Instead, the processing is executed after the elapse of the waiting time α. When the distance between the paper detection position de of the paper detection mechanism PE and the print position Pr of the print head 42 is L (shown in FIG. 5), and the paper conveyance speed is v, the waiting time α
Is preferably set to a time smaller than L / v. This is because if the second interrupt processing is delayed more than necessary, there is a problem in that the print processing is performed in a state where the paper is not already at the print position. Therefore, the waiting time α is set to a time smaller than L / v. By doing so, such a problem can be prevented.

In the above-described embodiment, an example has been described in which the CPU executes the program for performing the interrupt processing with a predetermined delay after detecting the output of the paper detecting mechanism PE. That is, in the above embodiment, the CPU has at least two interrupt terminals, and both the output of the open / close detection mechanism CO and the output of the paper detection mechanism PE are directly connected to the interrupt terminal of the CPU. However, as shown in FIG. 11, it is also possible to delay the output of the paper detection mechanism PE and input it to the CPU simply by using a delay circuit. The output of the opening / closing detection mechanism CO is directly connected to the interrupt terminal INT1 of the CPU.
The output of the paper detection mechanism PE is supplied to C through a delay circuit 150.
It is connected to the interrupt terminal INT2 of the PU. When an input is made to the interrupt terminal INT1, a first interrupt process (reporting of a cover open error or the like) stored after a predetermined address (# 1) in the ROM is executed, and the interrupt terminal INT2 is sent to the interrupt terminal INT2. If there is an input, a second interrupt process (such as notification of a paper end error) stored after a predetermined address (# 2) in the ROM is executed.
As the delay circuit 150, a known circuit may be used. However, the delay time of the delay circuit 150 needs to be set smaller than α, as in the above-described embodiment.

As described above, one embodiment of the present invention has been described with reference to the drawings. However, the present invention is not limited to the matters shown in the above embodiment, and the claims and the detailed description of the invention, and The range in which those skilled in the art can make changes and applications based on well-known techniques is included. For example,
In the embodiment described above, a printer that performs printing on roll paper has been described as an example. However, the present invention is not limited thereto, and a mechanism for storing fanfold paper, cut paper, and the like, and detecting the presence or absence of these papers, If the printer is equipped with a mechanism that detects the opening and closing of a cover and the like that opens and closes the paper storage unit, and if the printer separates the paper from the paper detection mechanism according to the opening and closing of the cover,
Effectively applied.

[0044]

As described above, according to the present invention, in the printer, when the opening / closing cover is opened, it is guaranteed that the output of the sensor for detecting the opening is earlier than the output of the sensor for detecting the presence / absence of paper. Erroneous notification to the worker can be prevented.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a printer according to an embodiment of the present invention.

FIG. 2 is an external perspective view corresponding to FIG. 1 in a state where an opening / closing cover is opened.

FIG. 3 is a perspective view showing an internal structure around a roll paper storage space, showing a state in which an opening / closing cover is closed.
This shows a state where the opening / closing cover is opened.

FIG. 4 is a perspective view showing an internal structure around a roll paper storage space, and shows a state in which an opening / closing cover is opened.

FIG. 5 is a side view showing an internal structure in a state where an opening / closing cover is closed.

FIG. 6 is an enlarged view of a main part of FIG. 5, showing a state where an opening / closing cover is closed.

7 is an enlarged view of a main part of FIG. 5, showing a state where an opening / closing operation lever is operated.

FIG. 8 is an enlarged view of a main part of FIG. 5, showing a state in which roll paper has run out.

FIG. 9 is a block diagram illustrating a control unit of the printer according to the embodiment of the present invention.

FIG. 10 is a flowchart illustrating an embodiment of error processing of the printer of the present invention.

FIG. 11 is a block diagram illustrating a control unit of a printer according to another embodiment of the present invention.

[Explanation of symbols]

 R Roll paper 10 Printer 12 Housing 14 Roll paper storage space 14b Holder 15 Ink cartridge storage 16 Paper discharge 17 Door 18 Cover 20 Gap 22, 24 Frame member 22a Groove 22b Detector mounting part 26 Case member 28 Transport roller unit 28a To d-axis 30 connecting rod 32 drive roller 34 auxiliary roller 34a gear train 36 platen 38 drive roller 40 auxiliary roller 42 print head 44 operating plate 46 opening and closing operation lever 48 lock claw 50 paper guide plate 50a notch 52, 54 swing lever 56 , 58 Micro switch 704 Four-section link mechanism 80 Paper feed motor 90 Carriage motor 100 Control unit 101 Print control unit 102 Interrupt processing unit 103 Storage unit 104 Clock unit 105 Notification unit 150 Host 200 Printing mechanism unit CO Open / close detection mechanism (of cover) PE paper detection mechanism

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B41J 29/46 B65H 26/06 B65H 26/06 B41J 29/12 C F term (Reference) 2C058 AC04 AC07 AE04 AF06 AF31 DA11 2C061 AQ05 AS06 CD07 CD14 CD15 HH03 HJ10 HK06 HK11 HK19 HN02 HN22 HV10 HV13 HV32 3F105 AA02 AB04 BA22 CA14 DA38 DB02 DC10 DC11

Claims (15)

[Claims] 1. A holder for accommodating sheets, and a holder which is openably and closably attached to the holder, forms a state in which sheets can be mounted in the holder when opened, and covers the holder for accommodating the sheets when closed. A cover, a printing mechanism for transporting and printing the paper, a printing controller for controlling the printing mechanism and performing a printing process, and opening / closing detection for detecting that the cover is open A mechanism, a paper detection mechanism for detecting that the paper has run out, and delay means for delaying the output of the paper detection mechanism caused by the operation of opening the cover from the output of the open / close detection mechanism and transmitting the output to the print control unit. Equipped printer. 2. A printing apparatus, comprising: a frame supporting the holder; wherein the printing mechanism includes a printing head installed on one of the frame and the cover; and a platen installed on the other of the frame and the cover. 2. The printer according to claim 1, wherein, when the cover is closed, the platen contacts the print head or faces the print head with a certain gap, and performs printing on paper guided therebetween. A first lever that moves with the opening and closing of the cover, an opening and closing detection mechanism that includes a first detector that detects the first lever that moves, a first lever that moves with the opening and closing of the cover, A second lever that moves even when the paper stored in the holder runs out, regardless of whether the cover is open or closed, and a paper detection mechanism that includes a second detector that detects the second lever that moves. 3. The printer according to claim 1, further comprising a support member configured to support the first and second levers in a state of being arranged in a direction substantially perpendicular to the sheet conveyance direction. 4. The printer according to claim 1, wherein the delay unit includes a delay circuit that delays an output of the sheet detection mechanism and transmits the output to the print control unit. 5. The timer according to claim 1, wherein the delay unit starts timing when the output of the paper detecting mechanism is detected, and outputs the output of the opening / closing detecting mechanism within a predetermined time after the timing unit starts measuring time. Is detected, a first interrupt process is performed prior to the print process performed by the print control unit. If the output of the open / close detection mechanism is not detected within the predetermined time, the first interrupt process is performed. The printer according to claim 1, further comprising an interrupt processing unit that performs a different second interrupt process. 6. The interrupt processing section performs the first interrupt processing when an output of the open / close detection mechanism is detected prior to an output of the paper detection mechanism, and precedes an output of the open / close detection mechanism. 6. The printer according to claim 5, wherein the timing is started when an output of the paper detecting mechanism is detected. 7. The print processing of the print control unit is stopped or inhibited by the first interrupt processing and the second interrupt processing performed by the interrupt processing unit.
The printer according to any of the above. 8. The information processing apparatus according to claim 5, further comprising a notifying unit for notifying a user that the cover is opened by the first interrupt processing performed by the interrupt processing unit. Printer. 9. The printer according to claim 5, further comprising: a notifying unit for notifying a user of the absence of the sheet by the second interrupt processing performed by the interrupt processing unit. 10. A holder for accommodating paper, and attached to the holder so as to be openable and closable so that a paper can be mounted in the holder when opened and covers the holder for accommodating the paper when closed. A cover, a printing mechanism for transporting and printing the paper, a printing control unit for controlling the printing mechanism and performing printing processing, and opening / closing detection for detecting that the cover is open A mechanism and a printer error handling method comprising a paper detection mechanism for detecting that the paper has run out, wherein timing is started when the output of the paper detection mechanism is detected, and after the timing is started, When the output of the opening / closing detection mechanism is detected within a predetermined time, a first interrupt process is performed prior to the printing process. When the output of the opening / closing detection mechanism is not detected within the predetermined time, An error processing method for a printer, comprising a step of performing a second interrupt process different from the first interrupt process. 11. Prior to the output of the paper detecting mechanism,
Performing the first interrupt processing when the output of the open / close detection mechanism is detected, and starting the timing when the output of the paper detection mechanism is detected prior to the output of the open / close detection mechanism. The method according to claim 10, wherein the error is included. 12. The printer according to claim 10, wherein each of the first interrupt processing and the second interrupt processing includes a step of stopping or inhibiting the print processing. Error detection method. 13. The printer error processing method according to claim 10, wherein the first interrupt processing is one of the following or a combination thereof. Notify the cover open error to the host connected to the printer. Notify the user of the cover open error by the notifying means provided in the printer. 14. The printer error processing method according to claim 10, wherein the second interrupt processing is any one of the following or a combination thereof. Notifying the host connected to the printer of the paper end error. Notifying the user of the paper end error by the notifying means provided in the printer. 15. The predetermined time is set to a value smaller than a ratio L / v of a distance L from a printing position of a printing mechanism section to a detection position of a sheet detection mechanism and a sheet conveyance speed v. 15. A printer error processing method according to claim 10, wherein: