JP2016043993A - Printer, control method and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printer performing printing onto label paper and being capable of performing appropriate control, especially appropriate detection of a paper jam, when being used by switching two detection sensors provided in the front and in the rear of a printing position, or the like.SOLUTION: A printer comprises: a first detector provided closer to an upstream side than a printing position in a transportation direction of a printing medium; a second detector provided closer to a downstream side than the printing position in the transportation direction; and a control section switching the first detector and the second detector and activating the first detector or the second detector. The control section detects a predetermined position of the printing medium during activation of the first detector, subsequently activates the second detector and determines occurrence of failure when failing to detect the printing medium while the printing medium is being transported by a predetermined distance.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a printing apparatus that performs printing on label paper, and more particularly, to a printing apparatus that can perform appropriate control when a plurality of detection sensors provided before and after a printing position are switched.

  2. Description of the Related Art Conventionally, a label printer that performs a printing process on a label sheet having a configuration in which labels are attached to a long mount at regular intervals is used. The printer is configured to perform printing by transporting the label to a printing position, and thereafter, the label is peeled off from the mount by a peeler mechanism, and the label created from the label issuing port is issued.

  Further, detection sensors are provided on the upstream side and the downstream side of the printing position in the conveyance path of the label paper, and the detection values of these sensors are used for controlling the printing process. The upstream sensor detects a specific position of the conveyed label, and is used for alignment control (cueing control) to the printing position. The downstream sensor is used to detect whether the label has been correctly peeled off and whether the label after peeling has been removed by the user.

  As a related technique, Patent Document 1 below discloses a technique for detecting a paper jam caused by a base sheet with a printed label attached thereto, using two sensors provided on the downstream side of a printing position.

JP 2001-315738 A

  In the above-described label printer provided with detection sensors on the upstream side and the downstream side of the printing position, for the reason of rationalization of the device, the power supply device of these two sensors is shared, and the two sensors are switched and used. In this case, the detection by the upstream sensor and the detection by the downstream sensor that should be performed during the conveyance of the label paper may overlap in timing, and some device layout and control timing is required.

  In addition, the said patent document 1 does not show the solution with respect to the said subject.

  Therefore, an object of the present invention is a printing apparatus that prints on label paper, and when two detection sensors provided before and after the printing position are switched and used, appropriate control, particularly paper jam (paper jam) is detected. It is to provide a printing apparatus capable of performing appropriate detection.

  In order to achieve the above object, according to one aspect of the present invention, a printing apparatus includes a first detector provided upstream of a printing position in a conveyance direction of a print medium, and a printing device in the conveyance direction. A second detector provided downstream; and a control unit that switches and operates the first detector and the second detector, wherein the control unit performs the printing during the operation of the first detector. After detecting a predetermined position of the medium, the second detector is operated to determine that a problem has occurred unless the print medium is detected while the print medium is conveyed for a predetermined distance.

  Further, in the above invention, a preferable aspect is that the control unit activates the first detector when detecting the print medium by the second detector while the print medium is conveyed by a predetermined distance. Features.

  Furthermore, in the above-described invention, a preferable aspect thereof is that the print medium is a sheet in which a plurality of labels are affixed to a long mount at a predetermined interval, and the first detector is disposed inside the printing apparatus. The label is detected, and the second detector is arranged at a label issuing port of the printing apparatus and detects the label.

  Furthermore, in the above-mentioned invention, a preferred aspect is characterized in that the predetermined position of the print medium is a position of a leading end in the transport direction of the label.

  Furthermore, in the above invention, a preferable aspect thereof is further provided with a peeler mechanism upstream of the second detector in the transport direction, and the control unit is configured to operate the peeler mechanism during the operation of the second detector. The label peeled by the step is detected.

  Furthermore, in the above invention, a preferred aspect is that a separation distance between the first detector and the second detector in the transport direction is twice a length obtained by adding the length of the label and the predetermined interval in the transport direction. It is characterized by being less than.

  In the above invention, one aspect is that the first detector includes a light emitting unit, a first light receiving unit, and a second light receiving unit, and the light emitting unit and the first light receiving unit constitute a transmissive optical sensor. The light emitting unit and the second light receiving unit constitute a reflective optical sensor.

  Furthermore, in the above-mentioned invention, a preferred aspect is characterized in that the first detector and the second detector share one power supply device.

  In order to achieve the above object, another aspect of the present invention is provided with a first detector provided upstream of the printing position in the transport direction of the print medium, and downstream of the printing position in the transport direction. And a second detector, wherein the first detector and the second detector are switched and operated, and a predetermined position of the print medium is detected during the operation of the first detector. After that, if the second detector is operated and the print medium is not detected while the print medium is conveyed for a predetermined distance, it is determined that a problem has occurred.

  In order to achieve the above object, still another aspect of the present invention provides a first detector provided upstream of the printing position in the transport direction of the print medium, and provided downstream of the printing position in the transport direction. A control device of a printing apparatus comprising: the second detector, wherein the first detector and the second detector are switched and operated, and a predetermined position of the print medium is set during the operation of the first detector. After the detection, the second detector is operated to execute a process of determining that a failure has occurred unless the print medium is detected while the print medium is conveyed by a predetermined distance.

  Further objects and features of the present invention will become apparent from the embodiments of the invention described below.

1 is an external perspective view of a printing apparatus to which the present invention is applied. It is a schematic sectional drawing which shows the internal structure of the printing apparatus to which this invention is applied. It is a schematic sectional drawing which shows the principal part of the printing apparatus to which this invention is applied. 2 is a functional configuration diagram of the printer 2. FIG. 5 is a diagram for explaining a positional relationship in a conveyance direction F. FIG. 5 is a flowchart illustrating a control procedure of a first sensor 23 and a second sensor 24.

  Embodiments of the present invention will be described below with reference to the drawings. However, such an embodiment does not limit the technical scope of the present invention. In the drawings, the same or similar elements are denoted by the same reference numerals or reference symbols.

  FIG. 1 is an external perspective view of a printing apparatus to which the present invention is applied, FIG. 2 is a schematic cross-sectional view showing its internal configuration, and FIG. 3 is a schematic cross-sectional view showing its main part. The printer 2 shown in FIGS. 1 and 2 is a printing apparatus to which the present invention is applied. The printing apparatus includes a first sensor 23 (first detector) and a second sensor 24 (second detector) shown in FIG. The first sensor 23 detects a predetermined position of the label paper (printing medium) during the conveyance of the label paper, and then switches to the second sensor 24 to detect the label. Then, control for switching to the first sensor is performed again. Further, when the second sensor 24 does not detect a label during conveyance of a predetermined distance, control is performed to determine that an error has occurred. As a result, even if the power supply devices of the first sensor 23 and the second sensor 24 are shared, appropriate conveyance control and paper jam detection control can be performed, and rationalization can be performed by reducing the number of parts of the device.

  The printer 2 according to the present embodiment is a label printer that performs printing on a label sheet in which a plurality of labels 7 are attached to a long mount 8 having a constant width at regular intervals, and issues labels. . As an example, a label printer using a thermal head for printing on a label which is a thermal paper. Some label sheets used by the printer 2 are provided with a mark 9 for detecting the label position between each label (see FIG. 5).

  As shown in FIGS. 1 and 2, the printer 2 includes a printer case 5 having a vertically long rectangular parallelepiped shape as a whole. A label issuing port 3 is formed on the upper surface portion 5A of the printer case 5, and a mount is formed on the lower side thereof. A discharge port 4 is formed. Further, a paper feed button 251 and LED lamps 252 to 254 for informing the operation state are arranged on the front surface portion 5A.

  Inside the printer case 5, a roll paper loading section is formed in the lower half of the printer case 5, and a roll paper 6 having a configuration in which a label paper is wound in a roll shape is loaded therein. The mount 8 with the label 7 fed out from the roll paper 6 is guided between the thermal head (printing head) 12 and the platen roller 13 through the conveyance path 11.

  The platen roller 13 is pressed against the printing surface of the thermal head 12 and defines the printing position of the thermal head 12. After printing is performed on the label 7 attached to the surface of the mount 8 by the thermal head 12, the mount 8 passes through a peeler mechanism 223 provided with a guide for bending the mount that is bent at an acute angle as a whole. Be transported. The printed label 7 is peeled off from the mount 8 by the peeler mechanism 223 and issued from the label issuing port 3.

  On the other hand, the mount 8 after the label 7 is peeled off is transported along a transport path bent at an acute angle by the mount bending guide. Thereafter, the mount 8 is guided to the front side of the printer 2 and discharged from the mount discharge port 4 to the front of the printer.

  Here, a first sensor 23, which is a reflection type and a transmission type optical sensor used for controlling the label sheet transport operation, is disposed on the label sheet transport path 11, which is the mount 8 with the label 7. The transmissive optical sensor includes a light emitting unit 23A and a light receiving unit 23B arranged with a label sheet interposed therebetween. The reflective optical sensor is composed of a light emitting unit 23A and a light receiving unit 23C arranged on the side of the label sheet on which the mark 9 is attached. Further, in the vicinity of the label issuing port 3, a second sensor 24 which is a transmission type optical sensor for detecting the label 7 issued from the label issuing port 3 is arranged. The transmissive optical sensor includes a light emitting unit 24A and a light receiving unit 24B arranged with the label 7 interposed therebetween.

  As shown in FIG. 3, the first sensor 23 is arranged upstream of the printing position by the thermal head 12 in the label sheet conveyance direction, and includes a light emitting unit 23A and two light receiving units 23B and 23C. When the first sensor 23 detects the label sheet itself or the portion with the mark 9 that is not a black mark, the first sensor 23 is used as a transmissive optical sensor, and the label is determined based on the amount of light received by the light receiving unit 23B. Detect paper. In the detection of label paper, the amount of received light varies depending on whether the label paper itself is not present at the detection position, only the mount 8 is present at the detection position, or if the label 7 is present at the detection position. Determine the position.

  Similarly, when detecting a portion with a mark 9 that is not a black mark, depending on whether there is no paper at the detection position, only the mount 8 is at the detection position, or there is a mark 9 at the detection position, respectively. The amount of received light is different, so that the position of the label paper conveyed can be determined. The black mark is a black mark that hardly reflects light.

  Further, when detecting the mark 9 that is a black mark, the first sensor 23 is used as a reflective optical sensor, and the label sheet is detected based on the amount of light received by the light receiving unit 23C. Even when used in this way, the amount of received light varies depending on whether there is a sheet at the detection position or if there is a mark 9 at the detection position, so that the position of the label sheet conveyed can be determined.

  The second sensor 24 is disposed downstream of the printing position of the thermal head 12 in the label sheet conveyance direction, and includes a light emitting unit 24A and a light receiving unit 24B. The amount of light received by the light receiving unit 24B varies depending on whether or not the label 7 is present at the detection position, thereby determining whether or not the label 7 is present.

  FIG. 4 is a functional configuration diagram of the printer 2. As an example, the printer 2 performs printing on the label paper described above based on print data transmitted from the host computer 1 and issues a label. The host computer 1 is a host device of the printer 2 and includes a predetermined application for generating print contents (print image) and a driver that uses the print contents as print data for the printer 2.

  The print data transmitted from the host computer 1 includes a control command and recording data. The record data is data representing the print content (print image) to be printed on the label 7 and includes characters, graphics, images, and the like. The control command is a command for controlling print processing in the printer 2, and includes a cue command, a line feed command, and the like. In addition, the above-described cueing command is a command for requesting that the label 7 be transported to the first printing position in printing each label.

  Next, the printer 2 has a functional configuration as shown in FIG. 4, and includes a controller 21, a mechanism unit 22 (print execution unit), the first sensor 23 and the second sensor 24 described above, and an operation unit 25.

  The controller 21 is a control unit of the printer 2 and controls the operation of the mechanism unit 22 based on detection values of the first sensor 23 and the second sensor 24. Although not shown, the controller 21 includes a CPU (control device), RAM, ROM, NVRAM, ASIC, and the like.

  As shown in FIG. 1, the controller 21 includes a receiving unit 211, a command analysis unit 212, a data development unit 213, a print control unit 214, a head control unit 217, and a transport control unit 218 as functional configurations.

  The reception unit 211 is a part that receives print data transmitted from the host computer 1, and includes a communication I / F, a reception buffer (RAM), and the like.

  The command analysis unit 212 is a part that sequentially interprets the print data received by the reception unit 211. When the control command is interpreted, the command analysis unit 212 notifies the print control unit 214 of the result and interprets the recording data. Passes the data to the data expansion unit 213.

  The data development unit 213 is a part that generates image data for printing by the mechanism unit 22 based on the recording data. Specifically, processing for expanding data expressed in image object units into data for each pixel is executed.

  The print control unit 214 controls the entire printing process. The control command interpreted by the command analysis unit 212, the image data developed by the data development unit 213, the detection values of the first sensor 23 and the second sensor 24, and the like. Based on the above, an instruction is issued to the control units 217 and 218 of the mechanism unit 22 to execute printing on the label paper. The printer 2 is characterized by the switching control of the first sensor 23 and the second sensor 24 and the paper jam detection control, the specific contents of which will be described later.

  Next, the head control unit 217 and the conveyance control unit 218 are units that control the head unit 221 and the conveyance mechanism 222 of the mechanism unit 22 in accordance with instructions from the print control unit 214, respectively.

  Note that the command analysis unit 212, the data development unit 213, the print control unit 214, the head control unit 217, and the conveyance control unit 218 are configured by a program that describes the contents of processing performed by each unit, a CPU that operates according to the program, a RAM, and the like. Can be configured.

  Next, the mechanism unit 22 includes a head unit 221, a transport mechanism 222, and a peeler mechanism 223. The head unit 221 is a part that executes a printing process on a label sheet, and includes the thermal head 12 and the like. The transport mechanism 222 is a part that executes processing for moving the label sheet in the transport direction F (see FIG. 5), and includes a transport path, a transport roller, a motor, and the like. The peeler mechanism 223 is a device that peels the label 7 from the mount 8.

  The first sensor 23 and the second sensor 24 are sensors provided in the above-described configuration and arrangement position, and share the same power supply device (not shown). Therefore, both do not operate simultaneously, and are switched and used under the control of the print control unit 214. The first sensor 23 detects the end of the label 7 or the mark 9, and the detected value is used to start printing (cueing) from a predetermined position of the label 7. Further, the second sensor 24 is peeled off through the peeler mechanism 223, and detects the presence or absence of the issued label 7, and the detected value is used for judgment of occurrence of paper jam and judgment of removal of the issued label 7 by the user. It is done.

  The operation unit 25 includes the paper feed button 251 and the LED lamps 252 to 254 described above.

  FIG. 5 is a diagram for explaining the positional relationship in the transport direction F. FIG. FIG. 5A is a diagram comparing the separation distance (distance between P1 and P3) of the first sensor 23 and the second sensor 24 in the transport direction F with the length of the label sheet. Here, as described above, since the first sensor 23 and the second sensor 24 are installed on the upstream side and the downstream side of the printing position (the position of the thermal head 12), respectively, the first sensor 23, the thermal head 12, And the installation position of the 2nd sensor 24 of the conveyance direction F becomes the position of P1, P2, and P3 shown by the right side of FIG. At the position P3, the label 7 is peeled off from the mount 8, but FIG. 5 schematically illustrates the mount 8 as well.

In order to execute print processing without any problem by the sensor switching control described later, the separation distance (distance between P1 and P3) needs to satisfy the following conditions.
Condition (1): Separation distance <X + 2Y
Condition (2): Separation distance <2X + 2Y
However, X = interval in the label transport direction F, and Y = length in the label transport direction F.

  The condition (1) is applied when the first sensor 23 performs control to detect both the leading end of the label 7 in the transport direction F and the rear end of the transport direction F. The condition (2) is applied to the first sensor 23. This is applied when control is performed by detecting only the leading end of the label 7 in the transport direction F.

  In the label sheet to which the mark 9 is attached, for example, as shown in FIG. 5A, the mark 9 is attached between the label 7 and the label 7 at the end of the mount 8. Detecting the front end of the mark 9 in the transport direction F and the rear end of the transport direction F corresponds to detecting the rear end and front end of the label 7.

  When the above conditions are not satisfied, a timing at which the first sensor 23 and the second sensor 24 must be operated at the same time occurs, and appropriate control cannot be performed. Accordingly, in the printer 2, the first sensor 23 and the second sensor 24 are arranged at positions where the above conditions (1) and (2) are satisfied in accordance with the dimensions (X, Y) of the label paper to be used.

  In the printer 2 having the above-described configuration, when print data is received from the host computer 1, the print control unit is based on the interpretation result of the command by the command analysis unit 212 and the image data generated by the data development unit 213. Reference numeral 214 controls conveyance of the label paper and printing by the thermal head 12, and printing on the label 7 is performed.

  In the printing process, printing by the thermal head 12 is started at a predetermined timing based on the detection value of the first sensor 23 during the conveyance of the label paper, and when the printing proceeds thereafter, the label 7 after printing is peeled off by the peeler mechanism 223. After the label 7 is peeled off, the peeled label 7 is detected by the second sensor 24, and then the label 7 is transported to a predetermined position (removal position) and the transport is stopped. Thereafter, when no label is detected by the second sensor 24, it is determined that the user has removed the printed label, and processing of the next label is started.

  FIG. 6 is a flowchart illustrating the control procedure of the first sensor 23 and the second sensor 24. Hereinafter, sensor switching control and paper jam detection control, which are features of the printer 2, will be described with reference to FIGS. 5 and 6. The control described here is performed when the label sheet is being conveyed. The case where both the front end of the label 7 in the transport direction F and the rear end of the transport direction F are detected by the first sensor 23, that is, the case where the condition (1) is applied will be described.

  First, the printing control unit 214 detects the rear end of the label 7 in the transport direction F by the first sensor 23 that is operating (step S1 in FIG. 6). At this time, in the example shown in FIG. 5, for example, the label sheet is in the position shown in FIG. 5B, and the rear end of the first label 7 is detected.

  Thereafter, the print control unit 214 continues to detect the leading edge of the label 7 in the transport direction F using the first sensor 23 (step S2 in FIG. 6). At this time, in the example shown in FIG. 5, the label sheet is in the position shown in FIG. Then, the tip of the second label is detected.

  As described above, the processing is performed while the label sheet is being conveyed, and the first sensor 23 that is operating detects the amount of received light at a predetermined time interval, and the print control unit 214 that has received the detection value performs the detection. The detection (S1, S2) is performed based on the change in the amount of received light.

  When the detection of the leading edge of the label 7 is completed, the print control unit 214 immediately switches the sensor to be operated from the first sensor 23 to the second sensor 24 (step S3 in FIG. 6). Thereafter, the second sensor 24 is activated, and similarly, the amount of received light is detected at predetermined time intervals.

  Thereafter, the print control unit 214 receives the detection value from the second sensor 24, and each time it receives the detection value, it determines whether or not the label 7 is detected based on the change in the amount of received light (step S4 in FIG. 6). ).

  This determination is repeatedly executed until the label 7 is detected (Yes in step S4 in FIG. 6) or the label sheet is conveyed by a predetermined distance (Yes in step 5 in FIG. 6). Note that the predetermined distance in step S5 is the conveyance distance after the detection of the leading edge of the label 7 in step S2, specifically, the length Y in the label conveyance direction F. Since the arrangement positions of the first sensor 23 and the second sensor 24 satisfy the above-described condition (1), when the label 7 is normally peeled off by the peeler mechanism 223 and is normally conveyed, the predetermined position is determined. While being transported a distance, the second sensor 24 detects the label 7.

  Therefore, if the process proceeds normally, the print control unit 214 detects the label 7 (Yes in step S4 in FIG. 6). In the example shown in FIG. 5, the label 7 is not detected until the label sheet reaches the position shown in FIG. 5D, and then the label 7 is detected as the conveyance proceeds. For example, the label 7 is detected in the state shown in FIG.

  When the label 7 is detected (Yes in step 4 in FIG. 6), the print control unit 214 immediately switches the sensor to the first sensor 23 (step S6 in FIG. 6). That is, the sensor 7 to be operated is switched from the second sensor 24 to the first sensor 23. If the first sensor 23 is operated at this timing based on the positional relationship of the sensors satisfying the condition (1) described above, the end detection of the next cycle is in time.

  In the example shown in FIG. 5, the first sensor 23 operates in the state shown in FIG. 5E, so that the rear end of the second label 7 can be detected.

  If the process proceeds normally as described above, the process returns to step S1, and thereafter, the same process is repeatedly executed.

  On the other hand, if the label 7 is not detected (No in step S4 in FIG. 6) and the label sheet is conveyed by a predetermined distance (Yes in step 5 in FIG. 6), the print control unit 214 indicates that the label 7 is normal. It is determined that there is a possibility of paper jam without being peeled off, and error processing is instructed (step S7 in FIG. 6). Specifically, the conveyance of the label paper is stopped and the LED lamp 252 and the like are turned on to notify the user of the occurrence of the error.

  Thereafter, when the error is resolved and the label sheet is in the transport state, the process proceeds to step S6, and the process proceeds as described above.

  In this way, the sensor control during the conveyance is executed. When the first sensor 23 detects only the leading end of the label 7 in the conveyance direction F, that is, it is configured to satisfy the condition (2). If there is, the processing in step S1 is eliminated, and the predetermined transport distance in step S5 is X (interval in the label transport direction F) + Y (length in the label transport direction F). The other processes are performed in the same manner as described above.

  As described above, in the printer 2 according to this embodiment, the label detection sensor (23, 24) provided on the upstream side and the downstream side across the printing position is switched and operated. Thus, it is possible to accurately detect a defect such as a paper jam caused by the separation failure 7.

  Further, transport control such as cueing by the upstream sensor (first sensor 23) can be performed without any trouble.

  Further, the present invention is suitable for a printing apparatus that performs printing on a sheet on which a plurality of labels are pasted at intervals on a long mount, and peels off the printed labels with a peeler.

  Moreover, the above-mentioned appropriate control is implement | achieved by setting it as apparatus arrangement | positioning which satisfy | fills the conditions (1) and conditions (2) which were mentioned above.

  In addition, since the upstream sensor (first sensor 23) can be used as a reflective sensor, a label sheet with a black mark can also be used.

  Thus, since it was set as the structure which can be controlled even if it switches and uses two sensors, those power supply devices can be shared and the number of parts of an apparatus can be reduced.

  Further, the present invention can be applied even if the printing method is different from the printer in the above-described embodiment.

  The protection scope of the present invention is not limited to the above-described embodiment, but covers the invention described in the claims and equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 Host computer, 2 Printer, 3 Label issue port, 4 Mount paper discharge port, 5 Printer case, 5A Front part, 6 Roll paper, 7 Label, 8 Mount, 9 mark, 11 Conveyance path, 12 Thermal head, 13 Platen roller, 21 controller, 22 mechanism unit, 23 first sensor, 24 second sensor, 25 operation unit, 211 receiving unit, 212 command analysis unit, 213 data development unit, 214 print control unit, 217 head control unit, 218 transport control unit, 221 head unit, 222 transport mechanism, 223 peeler mechanism, 251 paper feed button, 251-254 LED lamp

Claims (10)

A first detector provided upstream of the printing position in the conveyance direction of the print medium;
A second detector provided downstream of the printing position in the transport direction;
A controller for switching and operating the first detector and the second detector,
The controller detects a predetermined position of the print medium during operation of the first detector, and then operates the second detector to detect the print medium while the print medium is conveyed by a predetermined distance. Otherwise, it is determined that a failure has occurred. In claim 1,
The control unit activates the first detector when detecting the print medium by the second detector while the print medium is conveyed by a predetermined distance. In claim 1 or 2,
The print medium is a paper in which a plurality of labels are attached to a long mount at predetermined intervals,
The first detector is disposed inside the printing apparatus, detects the label,
The second detector is disposed at a label issuing port of the printing apparatus and detects the label. In claim 3,
The printing apparatus, wherein the predetermined position of the print medium is a position of a tip in the transport direction of the label. In claim 3 or 4,
Furthermore, a peeler mechanism is provided upstream of the second detector in the transport direction,
The control unit detects the label peeled off by the peeler mechanism during operation of the second detector. In any one of Claims 3 thru | or 5,
The printing apparatus is characterized in that a separation distance between the first detector and the second detector in the transport direction is less than twice a length of the label and the predetermined interval in the transport direction. . In any one of Claims 1 thru | or 6,
The first detector includes a light emitting unit, a first light receiving unit, and a second light receiving unit, and the light emitting unit and the first light receiving unit constitute a transmissive optical sensor, and the light emitting unit and the second light receiving unit include A printing apparatus comprising a reflective optical sensor. In any one of Claims 1 thru | or 7,
The first detector and the second detector share one power supply device. A printing apparatus, wherein: A control method for a printing apparatus, comprising: a first detector provided upstream of a printing position in a conveyance direction of a print medium; and a second detector provided downstream of a printing position in the conveyance direction. ,
The first detector and the second detector are switched to operate, and after detecting a predetermined position of the print medium during the operation of the first detector, the second detector is operated to operate the print medium. A control method comprising: determining that a problem has occurred if the print medium is not detected while the printer is transported for a predetermined distance. In a control device of a printing apparatus comprising: a first detector provided upstream of a printing position in a conveyance direction of a print medium; and a second detector provided downstream of a printing position in the conveyance direction.
The first detector and the second detector are switched to operate, and after detecting a predetermined position of the print medium during the operation of the first detector, the second detector is operated to operate the print medium. A program for executing a process of determining that a failure has occurred if the print medium is not detected while the printer is transported for a predetermined distance.

Images