JP7233951B2 - Crop mark detection device and cutting device equipped with the same - Google Patents

Description

The present invention relates to a crop mark detection device for detecting crop marks and a cutting device having the same.

Conventionally, crop marks have been used, for example, for positioning cutters of cutting devices. For example, Patent Document 1 discloses a cutting device equipped with a sensor for detecting crop marks. The sensor includes a light emitter and a light receiver and is configured to optically detect crop marks. Crop marks are printed on the media and are formed, for example, by black circles.

Light emitted from the light projector is reflected on the medium, and the reflected light enters the light receiver. The sensor detects crop marks based on the amount of light received by the light receiver. Since the crop marks are black, the reflectance is low. Therefore, when the sensor is above the crop marks, the reflected light will be weaker and less light will be received by the receiver. On the other hand, since the portion of the media other than the crop marks is white, the reflectance is high. Therefore, when the sensor is above the portion of the media other than the crop marks, the reflected light becomes stronger and the amount of light received by the light receiver increases. Therefore, the crop marks can be detected based on whether the amount of received light is equal to or less than the threshold.

A conventional sensor has an output circuit that increases the output voltage as the amount of light received by the light receiver decreases. As shown in FIG. 9, the output voltage becomes the maximum voltage VH when the crop mark is detected, and becomes the minimum voltage VL when the crop mark is not detected. Maximum voltage VH is lower than power supply voltage Vcc. A conventional sensor detects a crop mark based on whether or not the output voltage of the output circuit is equal to or higher than the threshold value Vth.

Japanese Patent Application Laid-Open No. 2001-260443

By the way, in recent years, media have become more diversified. For example, even if black crop marks are printed on glossy media, the crop marks themselves may be glossy and the reflectance may be relatively high. be. In such a case, for example, as shown in FIG. 9, the output voltage during crop mark detection may drop from VH to VH'. On the other hand, there are variations in sensor quality, and the threshold Vth may deviate from the design value due to individual differences in sensors. For example, the actual threshold may rise from Vth to Vth'. As a result, the output voltage VH' at the time of crop mark detection becomes lower than the threshold value Vth', and the crop mark cannot be detected satisfactorily in some cases. If a high-quality sensor is used, such a problem is less likely to occur, but the high-quality sensor is expensive, which leads to an increase in the cost of the device.

SUMMARY OF THE INVENTION The present invention has been made in view of such a point, and an object of the present invention is to improve detection accuracy while suppressing an increase in cost of a crop mark detection device.

A crop mark detection device according to the present invention is a crop mark detection device for detecting crop marks on a medium, comprising a light emitter for irradiating light toward the medium and a light receiver for receiving reflected light from the medium. an output circuit configured to output a higher voltage as the amount of light received by the photodetector increases within a range of a predetermined power supply voltage or less; and determining whether the output voltage of the output circuit is a threshold value or less; and a detection circuit for detecting the crop mark when it is equal to or less than a threshold. The crop mark detection device amplifies the output voltage of the output circuit so that the output voltage of the output circuit becomes the power supply voltage when the light receiver receives reflected light from a portion of the medium other than the crop marks. It has an amplifier that Alternatively, in the crop mark detection device, the output voltage of the output circuit becomes the power supply voltage and the output becomes overgain when the light receiver receives reflected light from a portion of the medium other than the crop marks. and an amplifier for amplifying the output voltage of the output circuit.

According to the crop mark detection device, the output circuit is configured to output a higher voltage as the amount of light received by the light receiver increases. When the light receiver receives reflected light from a portion other than the crop marks on the media, the output voltage of the output circuit becomes high, and when the light receiver receives the reflected light from the crop marks, the output voltage of the output circuit becomes low. . Since the output voltage when the reflected light from the crop mark is received is originally low, even if the reflectance of the crop mark is high, the increase in the output voltage can be suppressed. Therefore, even if the threshold deviates slightly from the design value, the output voltage during crop mark detection is less likely to be higher than the threshold. Therefore, erroneous detection of crop marks can be suppressed without using expensive light receivers and circuits. Therefore, it is possible to increase the accuracy of crop mark detection while suppressing an increase in cost.

According to the present invention, it is possible to improve the detection accuracy while suppressing an increase in the cost of the crop mark detection device.

1 is a perspective view of a cutting device according to an embodiment; FIG. Fig. 2 is a front view of the coupled print head unit and cutting head unit; FIG. 4 is a front view of the separated print head unit and cutting head unit; It is a front view of a cutting head unit. 1 is a block diagram of a control system of a cutting device; FIG. 4 is a plan view of media; FIG. Fig. 3 is an electronic circuit diagram of part of the crop mark detection device; FIG. 10 is a diagram showing changes in output voltage when the crop mark detection device passes above the crop marks; 4 is a flow chart showing the operation of the cutting device; FIG. 10 is a diagram showing changes in output voltage when the conventional crop mark detection device passes above the crop marks;

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a cutting device 10. FIG. A crop mark detection device 55 (see FIG. 3) according to this embodiment is provided in the cutting device 10 . It should be noted that the embodiments described herein are, of course, not intended to limit the invention in particular. Further, members and portions having the same function are denoted by the same reference numerals, and overlapping descriptions are appropriately omitted or simplified.

The cutting device 10 is a device that cuts the media 5 . In this specification, the terms “cutting” and “cutting” include cutting the entire media 5 in the thickness direction and cutting a part of the media 5 in the thickness direction. The cutting device 10 according to this embodiment also has a function of printing on the media 5 .

In the following description, left, right, top, and bottom refer to left, right, top, and bottom, respectively, as seen by the user in front of the cutting device 10 . Also, the direction closer to the user from the cutting device 10 is defined as the front, and the direction away from the cutting device 10 is defined as the rear. Symbols F, Rr, L, R, U, and D in the drawings represent front, rear, left, right, up, and down, respectively. Symbol Y in the drawing represents the main scanning direction. In this embodiment, the main scanning direction Y is the horizontal direction. Reference character X in the drawings indicates the sub-scanning direction. The sub-scanning direction X is a direction intersecting with the main scanning direction Y (for example, a direction intersecting perpendicularly in a plan view). In this embodiment, the sub-scanning direction X is the front-rear direction. However, the above direction is merely determined for convenience and should not be construed as limiting.

The cutting device 10 includes a table 12 on which the medium 5 is placed, a grit roller 14, a pinch roller 16, a guide rail 18, a belt 20, a print head unit 30, and a cutting head unit 40. there is

A grit roller 14 is provided on the table 12 . The grit roller 14 is driven by a feed motor 38 (see FIG. 4). The grit roller 14 is an example of a moving device, and moves the medium 5 in the sub-scanning direction X. As shown in FIG. The pinch roller 16 is arranged above the grit roller 14 . The grit rollers 14 and pinch rollers 16 are configured to sandwich the media 5 .

A guide rail 18 is arranged above the table 12 . The guide rail 18 extends in the main scanning direction Y. As shown in FIG. A carriage 31 (see FIG. 2A) of the print head unit 30 and a carriage 41 (see FIG. 2A) of the cutting head unit 40 are engaged with the guide rail 18 .

The belt 20 extends in the main scanning direction Y. As shown in FIG. The belt 20 is an endless belt. Pulleys (not shown) are wound around the right and left ends of the belt 20 . One pulley is connected to a carriage motor 39 (see FIG. 4) that drives the pulley. When the carriage motor 39 rotates, the pulley rotates and the belt 20 runs in the main scanning direction Y. As shown in FIG.

As shown in FIG. 2A, the print head unit 30 includes a carriage 31 and ink heads 32 provided on the carriage 31 . The ink head 32 is an example of a print head. The ink head 32 has nozzles 33 for ejecting ink. The ink head 32 ejects ink toward the medium 5 placed on the table 12 . Here, five ink heads 32 are mounted on the carriage 31 . The five ink heads 32 eject five different colors, such as yellow ink, magenta ink, cyan ink, black ink, and white ink. However, the number of ink heads 32 and the color of ink are not limited at all.

As shown in FIG. 1 , the cutting head unit 40 is arranged to the side of the print head unit 30 . As shown in FIG. 3, the cutting head unit 40 includes a cutting head 40A and a carriage 41. As shown in FIG. The cutting head 40A is mounted on the carriage 41. As shown in FIG. The cutting head 40A includes a cover 42, a cutter 43, and a cutter moving mechanism 44. As shown in FIG. 2A, carriage 41 is fixed to belt 20 . As the belt 20 runs, the carriage 41 moves in the main scanning direction Y along the guide rails 18 . The cutter 43 is configured to be vertically movable. As shown in FIG. 3, the cutter 43 includes a body case 43a detachably supported by the cutter moving mechanism 44, and a blade 43b disposed in the body case 43a and exposed to the outside from the lower end of the body case 43a. ing. The media 5 (see FIG. 1) is cut by the blade 43b of the cutter 43. As shown in FIG. The cutter moving mechanism 44 includes a voice coil motor 50 (see FIG. 3) that moves the cutter 43 toward and away from the media 5 . In this embodiment, the cutter moving mechanism 44 moves the cutter 43 vertically.

As shown in FIG. 2A, connecting members 90 and 91 made of magnets are provided on the left side of the carriage 31 of the print head unit 30 and the right side of the carriage 41 of the cutting head unit 40, respectively. An L-shaped bracket 92 is provided on the right side of the carriage 31 .

As shown in FIG. 2A, a right side frame 15R is arranged at the right end of the table 12. As shown in FIG. The right side frame 15R is provided with a lock device 93 for locking the print head unit 30 at the standby position. The locking device 93 includes a receiving metal fitting 94 hooked on the receiving metal fitting 92, and a locking solenoid 95 (see FIG. 4) for moving the receiving metal fitting 94 between a locking position (see FIG. 2B) and an unlocking position (see FIG. 2A). ) and The locking solenoid 95 is controlled by a controller 70 (see FIG. 4).

As shown in FIG. 2A, when the print head unit 30 performs printing, the receiving metal fitting 94 is set to the unlocked position. When the carriage 41 of the cutting head unit 40 moves to the right and the connecting member 90 and the connecting member 91 come into contact with each other, the carriage 41 and the carriage 31 are connected. As a result, the print head unit 30 can move in the main scanning direction Y together with the cutting head unit 40 . On the other hand, during cutting by the cutting head unit 40, as shown in FIG. 2B, the print head unit 30 is positioned at the standby position and the receiving metal fitting 94 of the lock device 93 is set at the lock position. This prevents movement of the print head unit 30 . When the carriage 41 moves leftward, the connecting member 90 and the connecting member 91 are separated, and the connection between the carriage 41 and the carriage 31 is released. As a result, the cutting head unit 40 can move in the main scanning direction Y while the print head unit 30 is waiting at the waiting position.

As shown in FIG. 4 , the control device 70 is a device that controls printing on the media 5 and cutting of the media 5 . The configuration of the control device 70 is not particularly limited. The control device 70 is, for example, a microcomputer. As shown in FIG. 1, the control device 70 is provided inside the cutting device 10 . The control device 70 is connected to an external computer 87 via an interface 86 so as to be capable of wired or wireless communication. The computer 87 stores data for printing and cutting. Controller 70 receives data from computer 87 and controls feed motor 38 , carriage motor 39 , locking solenoid 95 of locking device 93 , voice coil motor 50 and ink head 32 . The computer 87 is connected to an input device 88 such as a keyboard and a mouse, and a display device 89 such as a liquid crystal display.

The medium 5 is, for example, recording paper formed into a sheet from a resin material such as polyvinyl chloride or polyester. The medium 5 is not particularly limited as long as it can be cut at least. The medium 5 may be a relatively heavy plate-like body such as a resin plate made of acrylic resin or the like, a metal plate made of aluminum or iron, a glass plate, a wood plate, or a corrugated cardboard. , plain paper, and the like. The media 5 may have a glossy surface. The media 5 may be made of a material with high light reflectance.

As shown in FIG. 5, an image 6 and four crop marks 8 are provided on the surface of the medium 5 . The crop marks 8 are provided outside the four corners of the rectangular area 6W containing the image 6, respectively. Although the color and shape of the crop marks 8 are not particularly limited, they are formed by black circles here. The crop marks 8 are provided diagonally upward left, diagonally upward right, diagonally downward left, and diagonally downward right in FIG. 2 of the rectangular area 6W. Note that the upper side and the lower side in FIG. 5 indicate the rear side and the front side, respectively. In the cutting device 10, printing is performed while moving the medium 5 forward. The crop marks 8 are printed, for example, by an ink head 32 (see FIG. 2A). The media 5 has a peripheral area 9 located around the crop marks 8 . The peripheral area 9 has a different color than the crop marks 8 . In this embodiment, the color of the surface of the medium 5 is white. The color of the peripheral area 9 is here white. The color of the surface of the medium 5 and the color of the peripheral area 9 are not particularly limited, but the color of the crop marks 8 is set to be darker than the color of the surface of the medium 5 . In other words, the crop marks 8 are formed with a color having a lower light reflectance than the surface of the medium 5 .

As shown in FIG. 3, the cutting device 10 includes a crop mark detection device 55. As shown in FIG. The crop mark detection device 55 is provided on the cutting head 40A. The crop mark detection device 55 is configured to move together with the carriage 41 . The crop mark detection device 55 includes a main body 56 , a light emitting diode (LED) 57 and a photodiode 58 . The light emitting diode 57 and the photodiode 58 are examples of a light emitter and a light receiver, respectively, but the types of light emitter and light receiver are not particularly limited. For example, other light emitting elements and light receiving elements can be used as the light emitter and light receiver. The light-emitting diode 57 and the photodiode 58 are provided on the body portion 56 . The light emitting diode 57 and the photodiode 58 are arranged above the table 12 and face the media 5 on the table 12 . Although the light emitting diode 57 and the photodiode 58 are arranged at the same height here, there is no particular limitation. The light emitting diode 57 emits light toward the medium 5 and the photodiode 58 receives light reflected by the medium 5 .

The main body 56 of the crop mark detection device 55 is provided with an output circuit 22 for outputting a signal corresponding to the amount of light received by the photodiode 58, as shown in FIG. Output circuit 22 includes transistor 24 connected to photodiode 58 and amplifier 26 . The output circuit 22 is configured to output a higher voltage as the amount of light received by the photodiode 58 increases within a range below a predetermined power supply voltage Vcc.

Since the peripheral area 9 of the medium 5 is white, the reflectance is high. When the light emitted from the light emitting diode 57 strikes the peripheral area 9 and is reflected, the amount of light received by the photodiode 58 increases. As a result, the voltage output from the output circuit 22 increases. On the other hand, since the crop mark 8 is black, the reflectance is low, and when the light emitted from the light emitting diode 57 hits the crop mark 8 and is reflected, the amount of light received by the photodiode 58 is reduced. As a result, the voltage output from the output circuit 22 becomes low. If the output circuit 22 were not equipped with the amplifier 26, when the crop mark detector 55 passed over the crop mark 8, the output voltage would change as indicated by the dashed line in FIG. That is, when the crop mark detection device 55 moves from above the peripheral area 9 to above the crop mark 8, the output voltage drops from V1 to V2, and when it moves from above the crop mark 8 to above the peripheral area 9, the output voltage rises from V2 to V1.

On the other hand, in this embodiment, since the output circuit 22 includes the amplifier 26, the output voltage is amplified. Here, the gain Gain1 of the amplifier 26 is set so that the output voltage Vout becomes the power supply voltage Vcc when the photodiode 58 receives the reflected light from the peripheral region 9 . In many cases, the gain Gain1 of the amplifier 26 is set to a gain (amplification factor) such that the output voltage Vout is saturated when the photodiode 58 receives the reflected light from the peripheral region 9. (overgain). Therefore, as shown by the solid line in FIG. 7, when the crop mark detection device 55 moves from above the peripheral area 9 to above the crop mark 8, the output voltage drops from Vcc (>V1) to V3 (>V2). Moving from above the crop mark 8 to above the peripheral area 9, the output voltage rises from V3 to Vcc.

Since the output voltage is amplified by the amplifier 26, the voltage increases from V2 to V3 when the crop mark detector 55 detects the crop mark 8. FIG. For example, when the output voltage is doubled (Gain1=2), V3 is twice V2. However, since the absolute value of V2 is originally small, the absolute value of V3 is relatively small. Therefore, the voltage difference between the output voltage Vcc when the crop mark detection device 55 detects the peripheral area 9 and the output voltage V3 when the crop mark 8 is detected is sufficiently ensured. On the other hand, by amplifying the output voltage, the voltage change becomes steep. The voltage change rate θ1 when Gain1=2 is larger than the change rate θ0 when the output voltage is not amplified (θ1>θ0). Therefore, according to the present embodiment, the crop marks 8 can be detected more accurately, so that the positions of the crop marks 8 can be detected with higher accuracy.

As shown in FIG. 6, the crop mark detection device 55 has a detection circuit 28 that determines whether or not the output voltage Vout is equal to or less than a predetermined threshold Vth, and detects the crop mark 8 if the output voltage Vout is equal to or less than the threshold Vth. . Although the value of the threshold Vth is not particularly limited, it is set to Vth=Vcc/2 here. The value of the threshold Vth is set to an intermediate value between the output voltage when the crop mark detection device 55 detects the peripheral area 9 and the output voltage when the crop mark 8 is detected. can be set to Here, the detection circuit 28 is composed of a comparator. The detection circuit 28 is configured to send a signal to the control device 70 (see FIG. 4) when the output voltage Vout is equal to or less than the threshold Vth.

Furthermore, the gain of the amplifier 26 may be set to Gain2 (Gain2>Gain1), which is an overgain larger than Gain1. Even when such a gain Gain2 is set, the output voltage Vout when the crop mark detection device 55 detects the peripheral area 9 is saturated, as indicated by the dashed line in FIG. Become. However, the change in voltage becomes steeper than in the case of Gain1. That is, the voltage change rate θ2 in the case of Gain2 is larger than the change rate θ1 in the case of Gain1 (θ2>θ1). Therefore, the positions of the crop marks 8 can be detected with higher accuracy.

In this case, since the output voltage Vout is further amplified by the amplifier 26 compared to when the gain is Gain1, the output voltage Vout increases from V3 to V4 when the crop mark detection device 55 detects the crop mark 8. . For example, when the output voltage Vout is amplified three times (Gain2=3), V4 is three times V2. However, since the absolute value of V2 is originally small, the absolute value of V4 is relatively small. Therefore, the voltage difference between the output voltage Vcc when the crop mark detection device 55 detects the peripheral area 9 and the output voltage V4 when the crop mark 8 is detected is sufficiently ensured. In this way, the voltage difference between the output voltage when the crop mark detection device 55 detects the peripheral area 9 and the output voltage when the crop mark 8 is detected is used to detect the position of the crop mark 8. Increasing the gain of the amplifier 26 is effective in detecting the position of the crop mark 8 with higher accuracy, as long as it is sufficiently ensured without any trouble.

The configurations of the crop mark detection device 55 and the cutting device 10 have been described above. An example of the operation of the cutting device 10 will now be described with reference to FIG. FIG. 8 is a flow chart showing the procedure of printing and cutting by the cutting device 10. As shown in FIG.

In step S<b>10 , the user operates, for example, the external computer 87 to decide to print a predetermined image 6 on the medium 5 and cut the medium 5 . Thereby, the print data and the cut line data are transmitted from the computer 87 to the control device 70 .

In step S20, the control device 70 controls the ink head 32 based on the print data to print the image 6 and crop marks 8 on the surface of the medium 5 (see FIG. 5). At this time, the control device 70 functions as a print control device.

In step S30, the control device 70 controls movement of the crop mark detection device 55 so as to detect the periphery of the four corners of the rectangular area 6W of the medium 5. FIG. At this time, light is emitted from the light emitting diode 57 and the photodiode 58 receives the light reflected by the medium 5 . That is, the photodiode 58 receives reflected light reflected by the peripheral area 9 of the medium 5 or the crop mark 8 . As described above, the crop mark detection device 55 detects the crop mark 8 based on whether the output voltage Vout of the output circuit 22 is equal to or less than the threshold Vth. The crop mark detection device 55 sends a signal to the control device 70 when the crop mark 8 is detected. In this embodiment, the carriage motor 39 and the feed motor 38 are servo motors. The control device 70 receives a signal from an encoder (not shown) of the servomotor and detects the position of the crop mark detection device 55 . The position of the crop mark 8 is specified by the position of the crop mark detection device 55 when the crop mark 8 is detected.

At step S40, the control device 70 positions the cutting head 40A based on the position of the crop mark 8. FIG. Since the method of positioning the cutting head 40A based on the positions of the crop marks 8 is well known, the description thereof will be omitted here.

When the positioning is completed, in step S50, the control device 70 controls the feed motor 38, the carriage motor 39, and the cutting head 40A to cut the medium 5 along the cutting line 65 (see FIG. 5). Thus, the cutting of the medium 5 is performed based on the detection result of the crop marks 8 in step S30. In step S<b>50 , the control device 70 functions as a movement control device that controls the movement device based on the detection result of the crop marks 8 .

Thus, the cutting device 10 performs printing on the medium 5 and cutting of the medium 5 .

As described above, according to the crop mark detection device 55 of this embodiment, the output circuit 22 is configured to output a higher voltage as the amount of light received by the photodiode 58 increases. Therefore, when the photodiode 58 receives the reflected light from the peripheral area 9 of the medium 5, the output voltage of the output circuit 22 becomes high, and when the photodiode 58 receives the reflected light from the crop mark 8, the output circuit 22 output voltage will be lower. That is, the crop mark detection device 55 according to the present embodiment is configured such that the voltage becomes LOW when receiving the reflected light from the crop mark 8 and becomes HIGH when receiving the reflected light from the peripheral area 9 . It is configured.

Here, for example, the media 5 itself may be glossy and the reflectance of the crop marks 8 may be higher than expected. However, according to the crop mark detection device 55 according to the present embodiment, as shown in FIG. 7, the output voltage V3 when receiving the reflected light from the crop mark 8 is originally low, so the reflectance of the crop mark 8 is Even if it is higher than expected, the rise of the output voltage V3 is suppressed. Therefore, even if the threshold Vth slightly deviates from the design value, the difference between the threshold Vth and the output voltage V3 is sufficiently ensured, and the output voltage V3 at the time of crop mark detection is unlikely to become higher than the threshold Vth. Therefore, erroneous detection of the crop mark 8 can be suppressed without using an expensive photodetector and circuit. According to the crop mark detection device 55 according to the present embodiment, it is possible to improve the detection accuracy of the positions of the crop marks 8 while suppressing cost increases.

Further, according to the crop mark detection device 55 according to the present embodiment, the output voltage is amplified by the amplifier 26 so that the output voltage when detecting the peripheral area 9 becomes the power supply voltage Vcc. Therefore, as shown in FIG. 7, a sufficient difference can be ensured between the output voltage Vcc when detecting the peripheral area 9 and the output voltage V3 when detecting the crop marks. Further, when the crop mark detection device 55 passes above the crop mark 8, the change in output voltage can be steep. Therefore, the detection accuracy of the positions of the crop marks 8 can be further improved.

Also, when the output voltage is amplified in an overgain state by the amplifier 26 so that the output voltage when detecting the peripheral region 9 becomes the power supply voltage Vcc, as shown in FIG. and the output voltage V4 at the time of crop mark detection can be sufficiently secured. As a result, the change in the output voltage when the crop mark detection device 55 passes over the crop mark 8 can be made steeper. Therefore, the detection accuracy of the positions of the crop marks 8 can be further improved.

A crop mark detection device 55 according to this embodiment is provided in the cutting device 10 . The cutting device 10 positions the cutting head 40A based on the detection result of the crop mark detection device 55. FIG. Therefore, the cutting device 10 can accurately position the cutting head 40A.

The cutting device 10 according to this embodiment has not only the function of cutting the medium 5 but also the function of printing on the medium 5 . The cutting device 10 can print crop marks 8 on the media 5 (see FIG. 5). Therefore, the above technique can be applied not only to the medium on which the crop marks 8 are provided in advance, but also to the medium 5 on which the crop marks are not provided in advance.

Although one embodiment of the present invention has been described above, the above embodiment is merely an example, and various other embodiments are possible.

The cutting apparatus 10 according to the above embodiment includes a table 12 on which the medium 5 is placed, and the medium 5 is conveyed in the sub-scanning direction X by a so-called roll-to-roll conveying device. However, the cutting apparatus 10 may be of a flatbed type having a table on which a sheet of media is placed. In this case, the print head and cutting head move in the main scanning direction X and the sub-scanning direction Y with respect to the medium fixed on the table. As described above, the cutting device 10 is not limited to cutting the media 5 fed out from the roll, and may cut the media in sheet form. The cutting device 10 is not limited to a so-called roll-to-roll type device, and may be a flatbed type device. In the present invention, the term "table" means all members that support media, including a member called a platen.

The cutting device 10 according to the embodiment includes a print head unit 30 and has a printing function. However, the print head unit 30 may be omitted. The cutting device 10 need not have printing capabilities.

In the cutting device 10 according to the embodiment, the moving device conveys the medium 5 in the sub-scanning direction X by the grit roller 14 driven by the feed motor 38, and the crop mark by the carriage 41 driven by the carriage motor 39. It is configured to move the detection device 55 in the main scanning direction Y. As shown in FIG. However, it suffices if one of the crop mark detection device 55 and the medium 5 is movable relative to the other, and the configuration of the moving device is not limited at all. For example, the moving device may be configured to move the carriage 41 in the main scanning direction Y and the sub-scanning direction X.

In the above embodiment, the crop mark detection device 55 was provided in the cutting device 10 . However, the device on which the crop mark detection device 55 is mounted is not limited to the cutting device 10 . The crop mark detection device 55 can be applied to any device that utilizes crop marks.

5 media 8 crop marks 10 cutting device 12 table 22 output circuit 26 amplifier 28 detection circuit 32 ink head (printing head)
33 nozzle 41 carriage 43 cutter 55 crop mark detection device 57 light emitting diode (light emitting device)
58 Photodiode (light receiver)
70 control device (movement control device, printing control device)

Claims (4)

A crop mark detection device for detecting crop marks on media,
a light emitter that emits light toward the medium;
a light receiver that receives reflected light from the medium;
an output circuit configured to output a higher voltage as the amount of light received by the light receiver increases within a range of a predetermined power supply voltage or less;
a detection circuit that determines whether the output voltage of the output circuit is equal to or less than a threshold and detects the crop mark if the output voltage is equal to or less than the threshold;
an amplifier that amplifies the output voltage of the output circuit so that the output voltage of the output circuit becomes the power supply voltage when the light receiver receives reflected light from a portion of the medium other than the crop marks . Crop mark detection device. A crop mark detection device for detecting crop marks on media,
a light emitter that emits light toward the medium;
a light receiver that receives reflected light from the medium;
an output circuit configured to output a higher voltage as the amount of light received by the light receiver increases within a range of a predetermined power supply voltage or less;
a detection circuit that determines whether the output voltage of the output circuit is equal to or less than a threshold and detects the crop mark if the output voltage is equal to or less than the threshold;
The output voltage of the output circuit is adjusted so that the output voltage of the output circuit becomes the power supply voltage when the photodetector receives the reflected light from a portion other than the crop marks of the medium, and the output becomes overgain. A crop mark detection device , comprising : an amplifying amplifier. a table on which a medium having crop marks is placed;
a carriage spaced apart from the table;
a moving device that relatively moves at least one of the carriage and the medium on the table with respect to the other;
a cutter provided on the carriage for cutting the medium;
a crop mark detection device according to claim 1 or 2 provided on the carriage;
a movement control device connected to the detection circuit of the crop mark detection device and configured to control the movement device based on a detection result of the crop mark;
A cutting device with a print head having nozzles for ejecting ink onto the medium;
a print control device that controls the print head to print the crop marks on the media;
4. The cutting device of claim 3 , comprising:

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