JP2019093608A - Image recording device - Google Patents

Abstract

To record an image without deteriorating legibility of recording content according to a multi-feeding occurrence state when the multi-feeding of a recording medium occurs in an image recording device.SOLUTION: An image recording device 101 includes: recording means 205 which records an image on a recording surface of a sheet-like recording medium 201 conveyed by conveyance means in a conveyance direction; multi-feeding detection means 221 which detects the occurrence of multi-feeding in the recording medium conveyed by the conveyance means at a prescribed detection position on an upstream side of the recording means in the conveyance direction; and control means 301 which compares a non-multi-feeding range from a tip of the recording medium to a tip of a multi-fed subsequent recording medium with the position of a specific image included in the image when multi-feeding of the recording medium is detected by the multi-feeding detection means and records the specific image in the non-multi-feeding range when the specific image is included in the non-multi-feeding range.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an image recording apparatus for recording an image on a sheet-like recording medium.

  In an image recording apparatus such as a printer or a copying machine, when a sheet-like recording medium is fed and conveyed, so-called double feeding may occur in which a plurality of recording mediums are overlapped and conveyed. When double feed occurs and recording is performed in the same manner as in the normal state where double feed does not occur, an image to be recorded on one recording medium is recorded across a plurality of recording mediums. there is a possibility.

  Therefore, in Patent Document 1, when double feed is detected, the image is reduced according to the double feed amount (length of overlap of the recording media), and the image is recorded in one recording medium. Is disclosed.

JP, 2015-59974, A

  In Patent Document 1, since the image to be recorded is reduced according to the double feed amount, it can be avoided that the image is recorded across a plurality of recording media, but the image readability by the image being reduced. There is a problem that

  An object of the present invention is to provide an image recording apparatus capable of recording without reducing readability of recorded contents according to the occurrence state of double feeding when double feeding of the recording medium occurs.

  According to the present invention, there is provided a conveying means for conveying a sheet-like recording medium along a predetermined conveying direction, a recording means for recording an image on the recording surface of the recording medium conveyed by the conveying means, and the conveying means Double feed detecting means for detecting occurrence of double feeding on the recording medium to be carried out at a predetermined detection position upstream of the recording means in the transport direction, and double feeding detection of the recording medium by the double feeding detection means If it is determined that the non-overlapping range of the specific image included in the image is compared with the non-overlapping range from the And controlling means for recording the specific image to the non-double feed range when included in the range.

  According to the image recording apparatus of the present invention, when double feeding of the recording medium occurs, it is possible to perform recording without reducing readability of the recorded contents according to the occurrence state of double feeding.

It is a figure showing a recording system using a recording device in this embodiment. FIG. 2 is a cross-sectional view schematically showing a schematic configuration of the recording apparatus shown in FIG. FIG. 2 is a block diagram showing a schematic configuration of a control system of the recording apparatus. It is a figure which shows the structure of the line head used for this embodiment. FIG. 7 is a side view schematically illustrating an example of a sheet conveying operation in the recording apparatus. It is a flowchart which shows the procedure of the process performed by the main controller. It is a top view which shows the example of the image pattern recorded on a sheet | seat. It is an explanatory view showing an example of operation at the time of double feed occurrence. It is explanatory drawing which shows the other example of the operation | movement at the time of double feed generation | occurrence | production. It is explanatory drawing which shows the further another example of the operation | movement at the time of double feed generation | occurrence | production. It is a figure which shows the double feed detection method.

  Hereinafter, an embodiment of an image recording apparatus according to the present invention will be described in detail with reference to the drawings. In the present embodiment, an inkjet recording apparatus (hereinafter, simply referred to as a recording apparatus) that discharges ink onto a sheet-like recording medium to record an image will be described as an example. However, the embodiments described below are merely examples, and the present invention is not limited to the following embodiments.

First Embodiment
FIG. 1 is a view showing a recording system using a recording apparatus in the present embodiment. The recording system shown here is configured to include the recording apparatus 101 and a host computer PC as an information processing apparatus connected to the recording apparatus 101. The printing apparatus 101 and the host computer PC are connected by a printer cable 107, and print data processed by the host computer PC and various other data are transferred to the printing apparatus 101. The recording apparatus 101 performs a recording operation based on the transferred data.

  The recording apparatus 101 includes a feeding unit 109 that feeds a sheet-like recording medium (hereinafter, also referred to as a sheet), and a recording unit 108 that forms an image on the recording medium fed from the feeding unit 109. Equipped with The recording unit 108 includes a full-line ink jet recording head (hereinafter simply referred to as a recording head) having a long discharge port array in which a large number of discharge ports that discharge ink are arranged.

  The recording unit 108 continuously conveys the sheet toward the above-described recording head held at the fixed position, and discharges the ink from each discharge port of the recording head based on the recording data, and the ink is An image is recorded by landing on one surface (recording surface). Conveying means for conveying the sheets includes a feeding unit 109 for feeding sheets one by one from the plurality of sheets (stacked bodies) stacked on the feeding tray 102, and a predetermined number of sheets fed from the feeding unit. And a transport unit configured to transport along the transport path. The feeding unit (feeding unit) 109 includes a feeding tray 102 and a feeding mechanism described later for feeding the sheet stacked thereon to the conveyance unit. The feeding mechanism in this embodiment sequentially takes out the sheet positioned at the lower end of the stack, that is, the lowermost sheet, and sends the sheet to the conveyance unit.

  An outer shell of the recording apparatus 101 is configured by an upper cover 103, a front cover 104, and the like. Both covers can be opened and closed, and the inside can be opened for maintenance work and the like. Further, the recording unit 108 and the conveyance unit are covered by the upper cover 103, and the ink tank unit 206 (see FIG. 2) and the like storing the ink supplied to the recording head is covered by the front cover 104.

  Further, the recording apparatus 101 includes an operation panel 106 for performing various input operations in the recording apparatus, a power switch 105, and an error lamp 111, an LCD 112, etc. as notification means for notifying the user of an error occurrence status of the recording apparatus. Is provided.

  FIG. 2 is a cross-sectional view schematically showing a schematic configuration of the recording apparatus 101 shown in FIG. The feeding unit 109 rotates the feeding roller 202 by driving of a feeding motor (not shown), and feeds the sheet 201 in contact with the feeding roller 202 toward the recording unit 108. At the time of feeding, the retard roller 220 rotates in the opposite direction to the feeding roller 202 to separate the sheet 201 one by one from a plurality of sheets (stacking unit) stacked on the feeding tray 102, The sheet is fed to the recording unit 108. In this embodiment, since the circumferential surface of the feed roller 202 contacts the lowermost sheet 201 of the sheets stacked on the feed tray 102, at least the lowermost sheet is fed to the recording unit 108. .

  The recording unit 108 is configured to include a conveyance unit that conveys the sheet fed from the feeding unit 109, a recording head 205, and the like. The conveyance unit includes a conveyance roller 208, a driven roller 214, a conveyance motor 209 that rotates the conveyance roller 208, and a conveyance belt 203 bridged between the conveyance roller 208 and the driven roller 214. Further, the recording unit 108 is provided with a recording head 205, an ink tank unit 206 for supplying ink to the recording head 205, and the like.

  In addition to the above configuration, the recording unit 108 is provided with a sensor that detects a sheet, detects an operation state of each unit, and the like. As a sensor for detecting a sheet, for example, a feed sensor 215 for detecting a sheet fed by the feed roller 202, a TOF (Top Of Form) sensor 204 for detecting a position of the sheet, and a weight of the sheet There is a double feed sensor 221 or the like that detects feed.

  The double feed sensor 221 is an ultrasonic sensor, and includes a transmitting element that transmits an ultrasonic wave to a sheet positioned on a conveyance path, and a receiving element that receives the ultrasonic wave. FIG. 11 is a graph showing the reception signal level of the sensor reception unit at the time of occurrence of double feeding and the double feeding determination threshold when the double feeding sensor 221 uses an ultrasonic sensor.

  When the double feed sensor 221 is driven to cause the transmitting unit to transmit an ultrasonic wave, the receiving unit raises the signal level to be received. When the front end of the preceding sheet 201a passes through the receiving unit, the ultrasonic signal transmitted by the transmitting unit is slightly attenuated by passing through the sheet. As a result, the signal level received by the receiving unit is slightly reduced. Furthermore, when the multi-feed unit passes through the receiving unit, the ultrasonic signal transmitted by the transmitting unit is greatly attenuated by passing through the air layer between the preceding sheet 201a and the subsequent sheet 201b, and the received signal is received by the receiving unit. The level (voltage value) drops significantly. The double feed determination threshold for determining whether double feed has occurred is set between the level of the received signal when one sheet passes and the level of the signal when passing a double feed portion. Thus, when it is detected that the level of the received signal is less than or equal to the threshold value, it is determined that double feed has occurred.

  Further, as a sensor for detecting the operation state of each part, a rotary encoder 310 (see FIG. 3) for detecting the amount of movement of the conveyance belt 203 is provided. The rotary encoder 310 is an optical sensor including a disk-like scale (not shown) fixed to the rotation shaft of the conveyance roller 208 for cyclically moving the conveyance belt 203, and a light emitting unit and a light receiving unit facing each other across the scale. And (not shown). A plurality of slits are radially formed on the scale at predetermined intervals. The light emitted from the light projecting unit passes through the slit and is received by the light receiving unit, and the light receiving unit outputs a pulse-like output signal. The main controller 301 (see FIG. 3) described later detects the rotation amount of the conveyance roller, that is, the conveyance amount of the conveyance belt 203 by counting the output signal of the light receiving unit. In the scale, the intervals between adjacent slits are equal, and the intervals are set to be the same as the recording resolution in the transport direction of the recording apparatus 101. Therefore, the detection capability of the movement amount of the transport belt 203 is equal to the recording resolution.

  The ink tank unit 206 is connected to the recording head 205 via a tube (not shown). By controlling a recovery motor (not shown), the ink stored in the ink tank unit 206 is supplied to the recording head 205. The sheet 201 fed by the feeding unit 109 is nipped between the conveyance belt 203 of the recording unit 108 and a plurality of passive rollers 210 to 213 disposed to face the conveyance belt 203, and the conveyance belt 203 is conveyed. Is transported in the transport direction (Y direction). The conveyance mechanism in the present embodiment is constituted by the conveyance roller 208, the conveyance motor 209, and the passive rollers 210 to 213, and the conveyance means is constituted by the conveyance mechanism and the above-described feeding unit (feeding means). . Further, a sheet path moving in the conveyance direction (Y direction) while being nipped by the conveyance belt 203 and the passive roller 210 is a conveyance path in the present embodiment.

  The sheet 201 fed from the feeding tray 102 recognizes the existing position on the conveyance path based on the detection signal of the feeding sensor 215, the detection signal of the TOF sensor 204, and the output signal of the rotary encoder 310 (FIG. 3). And managed. When the sheet 201 reaches a position (recording position) facing the recording head, the ink is discharged from the recording head 205, and the ink is discharged on the surface of the sheet to record an image. A power supply unit 207 is provided behind the ink tank unit 206, and power is supplied to an electric circuit board (not shown), the recording head 205, various motors, and the like from this.

  FIG. 3 is a block diagram showing a schematic configuration of a control system of the recording apparatus 101. As shown in FIG. The main controller 301 exchanges signals with the host computer PC and controls the entire printing apparatus. The main controller 301 performs operations, determinations, comparisons, data processing, control and the like according to the program stored in the ROM 302, and functions as the determination means and control means of the present invention. A RAM 303 capable of temporarily storing data is connected to the main controller 301, and the main controller 301 controls storage and reading of data in the RAM 303. The RAM 303 is also used as a working memory when the main controller 301 performs processing.

  Also, the recording data transmitted from the host computer PC is stored by the main controller 301 in an image buffer (recording data storage means) 304 in a bitmap format. The print data stored in the image buffer 304 is transferred to a head drive circuit 305 for driving the print head 205. The head drive circuit 305 is a circuit for driving an ejection energy generating element (not shown) provided corresponding to each of the plurality of ejection openings formed in the recording head 205. When the head drive circuit 305 drives the discharge energy generating element in accordance with the recording data stored in the image buffer 304, ink in the form of droplets is discharged from the discharge port and lands on the sheet, whereby an image is recorded. In the present embodiment, an electrothermal transducer (heater) is used as the ejection energy generating element, but an electro-mechanical transducer (piezo) or the like can also be used as the ejection energy generating element.

  Further, the main controller 301 is provided with a motor drive circuit for driving a motor provided in the recording apparatus 101. As a motor incorporated in the recording apparatus 101, for example, in addition to the above-described feed motor 308 and transport motor 209, a lift motor 316 for moving the feed tray 102 up and down, ink in the ink tank unit 206 is supplied to the print head 205 Recovery motor 306 and the like. Then, the motor drive circuits 311, 312, and 313 which drive the respective motors are controlled by the main controller 301.

  Further, various sensors are connected to the main controller 301 via the sensor circuit 314. Examples of sensors used in the present embodiment include the TOF sensor 204 described above, the feed sensor 215, the rotary encoder 310, and the double feed sensor 221. Signals output from these sensors are input to the main controller 301 by the sensor circuit 314. Further, the feeding state and feeding interval of the sheet 201 fed by the feeding roller 202 by the driving of the feeding motor 308 are monitored based on the output signal from the feeding sensor 215.

  FIG. 4 is a view showing the configuration of a line head (recording head) 205 used in the present embodiment, where (a) is a perspective view showing an appearance, and (b) is a view of each discharge port shown in FIG. It is a figure which shows the arrangement configuration typically. On the bottom surface (discharge port formation surface) of the recording head 205, 2400 discharge ports ep1 to ep2400 are linearly arranged at intervals of 0.0425 mm. That is, the recording head 205 can perform recording at a resolution of 600 dpi (600 dots per inch) with a maximum recording width of 102 mm.

  FIG. 5 is a schematic side view for explaining an example of the sheet conveying operation in the recording apparatus 101. As shown in FIG. When the feed motor 308 and the transport motor 209 (FIG. 3) are driven, rotation of the feed roller 202 and circulation of the transport belt 203 are started. As a result, of the plurality of sheets (stacking units) stacked in the vertical direction on the sheet feeding tray 102 of the sheet feeding unit 109, the sheet 201 positioned at the lowest position contacts the lower surface of the sheet By rotation, the sheet is conveyed in the conveyance direction (Y direction) (FIG. 5A).

  Thereafter, the leading end of the sheet 201 in the conveying direction abuts on the conveying belt 203 and the passive roller 210. The passive roller 210 is biased toward the transport belt 203 by a spring (not shown). However, after the sheet 201 abuts against the passive roller 210, the passive roller 210 is pushed down against the biasing force of the spring by further moving forward, and the sheet is placed between the conveying belt 203 and the passive roller 210. Enter Thereafter, the sheet 201 is conveyed in the Y direction together with the conveyance belt 203 while being nipped by the conveyance belt 203 and the passive roller 210 (FIG. 5B). When the leading edge of the sheet 201 in the transport direction reaches the detection position of the TOF sensor 204, the main controller 301 receives a detection signal from the TOF sensor 204 and stops the driving of the feed motor 308 and stops the rotation of the feed roller 202. Let

  When the double feed sensor 221 disposed on the front side (upstream side) of the recording head 205 in the transport direction detects a sheet and outputs a detection signal, the main controller 301 causes the transmission unit of the double feed sensor 221 to emit ultrasonic waves. The double feed detection of the sheet 201 is started. If double feeding has not occurred on the sheet 201, when the sheet 201 reaches the recording position, all images scheduled on the sheet 201 are recorded according to the recording data.

  When the trailing end of the sheet 201 passes the feeding sensor 215 and the detection signal of the feeding sensor 215 changes from ON to OFF, the main controller 301 rotates the feeding roller 202 again to feed the next sheet. Start (FIG. 5 (c)). Thereafter, when the rear end of the sheet 201 for which the recording operation is completed passes the passive roller 213, the sheet 201 is discharged to the discharge unit 110 (FIG. 5D).

  FIG. 6 is a flowchart showing the procedure of processing executed by the main controller 301. In the process shown in FIG. 6, for example, the main controller 301 reads a control program stored in the ROM 302 into the RAM 303, and executes the program according to the program.

  When the recording start command is received from the host computer PC (S100), the main controller 301 drives the feed motor 308 and the conveyance motor 209 to start the feeding and conveyance of the sheet 201. Next, when the leading end of the sheet 201 reaches the TOF sensor 204, and the detection signal is output from the TOF sensor 204 (when the ON signal is output (S102)), the main controller 301 moves the sheet 201 The measurement of s) is started (S103). The measurement of the movement distance is performed by counting the output signal of the rotary encoder 310.

  Next, it is determined whether or not the sheet 201 has reached the position facing the recording head 205 (recording position) (S104). In the present embodiment, the distance s from the TOF sensor 204 to the recording head 205 is set to 100 mm. Therefore, when the moving distance s of the sheet 201 from the TOF sensor 204 exceeds 100 mm, recording on the sheet 201 by the recording head 205 is started (S105).

  FIG. 7 is a plan view showing an example of an image pattern to be recorded on the sheet 201. As shown in FIG. In this example, a part of the entire image pattern includes a specific image such as a barcode BC. The image length of all image patterns is n, and the image length of a specific (bar code) image pattern is m.

  In addition, although a specific image is demonstrated as a barcode in a present Example, a two-dimensional code, a logo mark, etc. may be sufficient.

  When the recording operation is started, the main controller 301 starts measuring the moving distance (recording distance b) of the sheet 201 by counting the signal output from the rotary encoder 310 (S106). Furthermore, the main controller 301 conveys a sheet (preceding sheet) 201a fed in advance, in a state where a sheet (following sheet) 201b fed immediately after that is partially overlapped, so-called double feeding Is determined (S107). This determination is performed by the output signal of the double feed sensor 221. Double feeding occurs due to frictional resistance or adsorption force generated between the preceding sheet 201a and the following sheet 201b, and the occurrence position (double feeding position) is the number of stacked sheets at the time of conveyance, type of sheet, and It changes variously depending on the environment and other conditions. Therefore, based on the double feed detection signal from the double feed sensor 221, the double feed position of the following sheet 201b with respect to the preceding sheet 201a is measured.

  If it is determined based on the output signal of the double feed sensor 221 that the double feed has not occurred on the preceding sheet 201a, the main controller 301 performs the recording operation until the full image length n of the image pattern is reached (S108). That is, all the images to be recorded on one sheet are recorded on the preceding sheet 201a, and then the recording operation is ended.

  On the other hand, when the double feed sensor 221 detects double feed during recording (S107), the distance p from the leading end of the preceding sheet 201a to the double feed position, and identification in the image to be recorded in one sheet The length of the image in the transport direction (specific image length) is compared. Thus, it is determined whether a specific image can be recorded. Here, the specific image means an image having a particularly high recording priority in the image pattern.

  When the double feed sensor 221 detects double feed during recording, the distance p from the leading end of the preceding sheet 201 to the double feed generation position is “distance x from the double feed sensor 221 to the recording head 205”, “recording” The distance (b + x) is obtained by adding the recording distance b ′ from the start to the occurrence of double feed. Hereinafter, the area from the leading end of the preceding sheet 201 to the double feeding generation position is referred to as a non-double feeding area, and the distance p (= b + x) from the leading end of the leading sheet 201a to the double feeding generation position is referred to as a non double feeding distance.

  It is determined whether the specific image in the image pattern can be recorded by comparing the non-double feed distance p (= b + x) with the specific image length m (S109). Here, when the specific image length is longer (p <m), that is, when the specific image can not be included in the non-double feed area, it is determined that the recording of the specific image is not possible, and the double feed is performed. The recording operation for the preceding sheet 201a is stopped among the sheets 201 being printed. Further, for the succeeding sheet 201b of the sheet 201 being double-fed, recording is normally performed by the recording head 205 with the position where the double-fed sensor has detected double-fed feeding as the leading end position (S112) Record all the images to be recorded.

  As a result of comparison between the non-double feed distance p (= b + x) and the specific image length m, when the specific image length m is shorter than the non-double feed distance (p> m), the specific image can be recorded It is determined (S109) that the recording on the preceding sheet 201a is continued (S110). Here, as a recording form on the preceding sheet 201a, (i) a form in which only a specific image is recorded, and (ii) an image of a non-double feeding area (area from the leading end of the preceding sheet to the double feeding occurrence position) There is a form to record. The user may designate which recording form to select, or may be determined according to the image pattern to be recorded. After recording of the preceding sheet 201a (S110), the leading edge detection / recording operation of the succeeding sheet 201b is performed in the same manner as the preceding sheet 201a (S112).

  8 to 10 are explanatory views showing the recording operation based on the double feed detection result of the present embodiment. In each of FIG. 8, FIG. 9 and FIG. 10, (a) is a side schematic view of the recording apparatus, and (b), (c) and (d) are recording media according to the double feed pattern (double feed distance). Indicates the recording status of

  FIG. 8 shows that the non-double feed distance p (the distance (b + x) from the leading edge to the double feed occurrence position) of the preceding sheet 201a at the time of double feed occurrence is the total length (total image length n) of the image to be recorded on one sheet. ) Is an explanatory view showing an operation in the case of being longer than. When double feeding occurs while feeding and transporting the sheet 201 (FIG. 8B), and the double feeding occurrence position moves to a position facing the double feeding sensor 221 (FIG. 8C), the double feeding sensor A detection signal is output from 221. At this time, when the non-double feed distance p of the preceding sheet 201a is longer than the total image length n, the recording operation on the preceding sheet 201a by the recording head 205 is continuously performed (FIG. 8C).

  After the recording for the entire image length n on the preceding sheet 201a is performed, the recording operation on the subsequent sheet 201b by the recording head 205 is continuously performed with the position where the double feed is detected as the leading end of the subsequent sheet 201b (see FIG. 8 (d). As a result, a predetermined image pattern can be recorded on both the preceding sheet 201a and the succeeding sheet 201b.

  FIG. 9 is an explanatory view showing the operation in the case where the non-double feed distance p of the preceding sheet 201a when double feed occurs is shorter than the total image length n of the image pattern to be recorded and longer than the specific image length m. It is. It is assumed that double feeding occurs while feeding and transporting the sheet 201 (FIG. 9B), and then double feeding is detected by the double feeding sensor 221. At this time, when the non-double feed distance p of the leading sheet 201a is shorter than the total image length n and longer than the specific image length m, as shown in FIG. 9C, the leading sheet 201a is not moved by the recording head 205. The recording operation is performed for the specific image length m and the recording operation is stopped. After that, the recording operation on the subsequent sheet 201b by the recording head 205 is executed with the position where the double feed has been detected as the leading end of the subsequent sheet 201b (FIG. 9D).

  FIG. 10 is a diagram showing an operation in the case where the non-double feed distance p of the preceding sheet 201a when double feed occurs is shorter than the specific image length m in the image pattern to be recorded. When double feed occurs while feeding and transporting the sheet 201 (FIG. 10B), and then double feed is detected by the double feed sensor 221, the non-double feed distance p and the specific image length m The following operations are performed based on the relationship of. That is, when the non-double feed distance p of the preceding sheet 201a is shorter than the specific image length m (FIG. 10B), the recording operation on the preceding sheet 201a by the recording head 205 is immediately stopped. Then, with the position where double feed is detected by the double feed sensor 221 as the leading end of the subsequent sheet 201b, the recording operation on the subsequent sheet 201b by the recording head 205 is executed (FIG. 10 (d)).

  As described above, according to the image recording apparatus of the present embodiment, even when double feeding occurs during recording, the predetermined operation is not performed uniformly, but the predetermined image is generated based on the double feeding occurrence position. Since the recording operation for the minute is continued, it is possible to reduce the decrease in throughput due to the device stop. In addition, at the time of double feed occurrence, while recording a high priority image in the non-double feed area, by suppressing inappropriate recording such that one image is formed across two sheets, ink or It is possible to reduce time waste. Therefore, it is possible to suppress an increase in running cost.

(Other embodiments)
In the above embodiments, a recording apparatus using an inkjet recording method has been described as an example of an image recording apparatus to which the present invention is applied. However, the present invention can be applied to any recording apparatus that performs recording on a sheet-like recording medium, such as an electrophotographic printer, a copier, a multifunction peripheral, or a thermal transfer apparatus, regardless of the recording system. .

  Further, the present invention is applicable not only to the case where two recording media are double-fed but also to double feeding when three or more recording media overlap. Also in this case, based on the detection result of the double feed detection unit, it is determined whether or not a specific image can be recorded inside the non-double feed range, and the recording operation by the recording unit is controlled based on the result. You should do it.

101 image recording apparatus 201 recording medium 205 recording means 221 double feeding detection means 301 control means

Claims (12)

Conveying means for conveying a sheet-like recording medium along a predetermined conveyance direction;
Recording means for recording an image on the recording surface of the recording medium conveyed by the conveyance means;
Double feed detection means for detecting occurrence of double feed on the recording medium transported by the transport means at a predetermined detection position upstream of the recording means in the transport direction;
When double feeding of the recording medium is detected by the double feeding detection unit, a non-double feeding range from the leading end of the recording medium to the leading end of the subsequent recording medium double fed, and the position of the specific image included in the image Control means for comparing the specific image to the non-double feed range when the specific image is included in the non-double feed range;
An image recording apparatus comprising:   The control means, when the double feed detection means detects double feed of the recording medium, determines the non-double feed distance which is the distance in the transport direction of the non-double feed range, and the specification from the front end in the transport direction of the image. The position where the recording is to be stopped inside the non-double feed range is determined based on the result of comparison with the image length which is the length to the rear end in the transport direction of the image. Image recording device.   3. The image recording apparatus according to claim 2, wherein, when the non-double feed distance is longer than the image length, the control means stops the recording when the recording means executes the recording of the specific image. .   4. The control method according to claim 2, wherein, when the non-double feed distance is longer than the image length, the control means stops the recording when all the images in the non-double feed range are recorded by the recording means. The image recording apparatus described in.   The image recording apparatus according to any one of claims 2 to 4, wherein when the non-double feed distance is shorter than the image length, the recording by the recording unit is not performed.   The said control means records the said image by the said recording means, when the said non-double feed distance is longer than the length in the said conveyance direction of the said image. Image recording device.   When the specific image is not included in the non-double feed range, the control means executes the recording of the image with the position at which the double feed is detected by the double feed detection unit as the leading end position of the subsequent recording medium. The image recording apparatus according to any one of claims 1 to 6, wherein   The double feed detection means detects a state in which a subsequent recording medium conveyed behind the preceding recording medium overlaps the recording surface of the preceding recording medium conveyed by the conveyance means. An image recording apparatus according to any one of claims 1 to 7.   The image recording apparatus according to any one of claims 1 to 8, wherein the double feed detection unit detects double feed in which three or more recording media overlap.   The conveying means is a feeding means for feeding the recording medium located at the end of the stacking portion formed by stacking a plurality of the recording media toward the recording means, and the feeding from the feeding means The image recording apparatus according to any one of claims 1 to 9, further comprising: a transport mechanism for transporting the selected recording medium toward the recording means.   The image recording apparatus according to any one of claims 1 to 10, wherein the specific image is a barcode or a two-dimensional code.   The image recording apparatus according to any one of claims 1 to 11, wherein the recording unit discharges ink to perform recording.

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