JPH05246596A - Paper sheet turning-over unit - Google Patents

Abstract

PURPOSE:To eliminate any possibility of a paper sheet being conveyed in a laterally inclined state by making control in such a way that a point of time when a matching part is released from matching is caused to fall behind a time when the forward end of a paper sheet delivered to a paper feed route is held by means of a conveyance roller. CONSTITUTION:A paper sheet S the side edge part of which is regulated and corrected by means of a matching part 409 is delivered by means of a friction force between a paper feed roller and an auxiliary roller in such a way that when a paper feed signal is outputted, an auxiliary roller 445 is rotated counterclockwise togetherwith a paper feed roller 444, and nipped by means of the paper feed roller 444. As a result of a one-way regulating guide 419 being switched, the paper sheet S is guided to the paper feed route 420 side. The forward end part S2 of the paper sheet S is detected when the forward end thereof passes a reset sensor 423 and counting by a timer is started. At this time, both sides of the paper sheet S are still guided by a guide member 415. Since the forward end S2 of the supplied paper sheet is held by a conveyance roller 422, the matching part 409, simultaneously, is released from matching. Therefore stable conveyance of the paper sheet is carried out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet reversing unit equipped in a sheet handling device or the like.

[0002]

2. Description of the Related Art An image forming apparatus such as a copying machine or a printing machine, or other sheet handling apparatus, is provided with a so-called sheet reversing unit capable of reversing the sheet surface during or after the conveyance. There is. This sheet reversing unit generally includes a sheet receiving port 2 and a sheet feeding port 3 of a unit body 1 as shown in FIG.
A sheet reversing path 4 formed so as to draw a substantially S-shape, and an aligning section 5 arranged near the sheet discharge port 9 of the sheet reversing path 4 are provided between the sheet reversing path and the sheet reversing path. The aligning section 5 restrains both sides of the sheet discharged from the sheet reversing path 4 and corrects the position of the sheet in the width direction, and the aligning section 5 is arranged below the guide member 6 to guide the guide member 6. It comprises a driving means 7 such as a motor for sliding the sheet to an alignment position according to the sheet size. Further, the aligning section 5 is provided with an empty sensor 8 to detect the presence or absence of a sheet in the aligning section 5. The sheet whose position is corrected by the aligning unit 5 is fed out to the sheet feeding path 11 by the sheet feeding / discharging roller 10 which rotates in the direction opposite to the sheet discharging direction, and is further fed to the sheet delivery port 3 by the conveying roller 12.

[0003]

By the way, the guide member 6 of the aligning portion 5 has a releasing position located outside the sheet width and an aligning position corresponding to the sheet width. Then, the sheet is normally located at the release position, and when the sheet is discharged to the aligning section 5, the aligning operation is performed according to the sheet size and the sheet is set to the aligning position. And
When feeding the sheet from the aligning section 5 to the sheet feeding path 12,
The guide member 6 of the aligning unit 5 is fed while guiding both sides of the sheet, and the empty sensor detects the trailing edge of the sheet. At the same time, the aligning operation of the aligning unit 5 is released and the guide member 6 is retracted to the release position. I was doing.

However, when the aligning operation of the aligning section 5 is released at such a timing, the guide member 6 is moved to the release position when the leading end does not reach the transport roller 12 such as when a small-sized sheet is transported. When the sheet is conveyed only by the sheet feeding / discharging roller 10, the conveying posture of the sheet becomes unstable, and the sheet may be conveyed in a state of being inclined in the left-right direction.

Therefore, the technical problem to be solved by the present invention is that the time when the aligning operation of the aligning portion is released is after the front end portion of the sheet fed to the sheet feeding path is held by the conveying roller or the like. This control eliminates the risk of the sheet being conveyed in a state of being inclined in the left-right direction.

[0006]

In order to solve the above-mentioned problems, the present invention is provided with a sheet receiving port and a sheet sending port on opposite sides of a unit main body, and a single-sided process sent from an image forming apparatus. The completed sheet is introduced into the unit main body from the receiving port, the predetermined reversing path formed in the unit main body is conveyed to reverse the image forming surface of the sheet, and the sheet is sent to the aligning section by the paper discharge roller, After the positional deviation of the sheet is corrected by the aligning operation of the aligning section, the aligned sheet is fed from the aligning section to the sheet feeding path different from the reversing path by the sheet feeding roller, and further provided in the middle of the sheet feeding path. In the sheet reversing unit configured to convey the image from the delivery port of the unit main body to the image forming apparatus via the conveying roller, Place the detection means of a sheet in the paper path, and means for sheet reversing unit which is adapted to release the matching operation of the matching unit based on the detection signal from the detection means.

[0007]

According to the above-mentioned means, when the sheet is fed from the aligning section to the sheet feeding path, the passage of the sheet is detected by the limit sensor disposed in the middle of the sheet feeding path, and the leading edge of the sheet is detected based on this detection signal. The time until the unit is nipped by the transport rollers is counted, and then the aligning operation of the aligning unit is released.

[0008]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. 1 and 2 show a printer P as an image forming apparatus. The printer P includes a printer main body 100 for forming an image, a transport unit 200 arranged on the downstream side of the printer main body 100, a main body-mounted paper feeding unit 300 installed in the lower portion of the printer main body 100, and a lower portion thereof. The sheet reversing unit 400 is installed. It should be noted that the main body-mounted paper feeding unit 300 can be formed by stacking the same units in a plurality of stages such as two stages and three stages, or conversely, without mounting the units directly to the printer main body 100.
It is possible to stack the sheet reversing unit 400 and the sheet reversing unit 400 and to freely combine a sheet distribution unit (not shown) under the sheet reversing unit 400. The sub-control units 301 and 401 of the units 300 and 400 are connected to the main control unit 1 of the printer body 100 via the connectors.
01 is electrically connected to the main control means 1
The configuration state of each unit mounted by 01 is recognized and individually controlled. In particular, the sub-control unit 301 of the main body mounting paper feeding unit 300 that can be stacked in a plurality of stages is configured to output a signal to the printer main body 100 so that the printer main body 100 can be recognized and the upper unit of the upper unit. Locking means (not shown) are provided so that the drawer cassettes, which will be described later, cannot be pulled out while the lower unit is operating. In addition, each of the above units 300, 40
0 is provided with positioning means 302, 402 for mounting and positioning the printer main body 100 or the upper unit, and unit mounting order error preventing means 303, 304 for restricting each unit 300, 400 in a stacked state of a predetermined pattern. Has been. Further, a main body accommodating and feeding unit 500 is integrally incorporated in the bottom of the printer main body 100.

The printer main body 100 includes an image forming unit 102 for printing a sheet fed from a paper feeding unit such as the main body accommodating paper feeding unit 500 or the main body mounting paper feeding unit 300. In the image forming unit 102, the sheet guide unit 10 to the sheet guide 10
3 is fed into the registration roller 105 by the conveyance roller 104, and the registration roller 10
Then, the image forming drum 106 transfers the image onto the sheet. Then, the sheet is further passed through a pair of fixing rollers 107 to fix the image on the sheet, and the sheet is sent to the transport unit 200 via the paper discharge roller 108 arranged on the downstream side. A switchable sheet reversing guide 1 is provided near the downstream side of the paper discharge roller 108.
The sheet reversing guide 09 is provided, and by switching the sheet reversing guide 109, it is also possible to discharge the sheet in a sheet reversing tray 110, which is provided separately from the transport unit 200, with its front and back reversed.

The sheet fed into the conveying unit 200 is conveyed to the sheet discharging roller 203 side through the sheet discharging relay roller 202 after the leading edge of the sheet is detected by the sheet discharging sensor 201, and in the state where the front side thereof faces up. The paper is discharged onto the paper discharge tray 204. Further, the transport unit 200 has a sheet re-feeding path in addition to the sheet discharging path. This re-feeding path includes a switchable re-feeding guide piece 205 arranged between the delivery relay roller 202 and the delivery roller 203, and a re-feeding guide 206 continuing from the re-feeding guide piece 205. ,
A refeed sensor 207 that detects the passage of the leading edge of the sheet at the leading end of the refeed guide 206, and the refeed discharge roller 20.
8 and. Then, the refeed guide piece 2
By switching 05, the path of the re-feeding path is opened and the sheet is fed into the re-feeding guide 206. When the leading edge of the sheet is detected by the re-feed sensor 207 and the trailing edge passes through the fixing roller 107, the sheet discharge roller 203
The sheet rotation speed is increased and the sheet conveyance speed is increased. The sheet that has passed through the re-feeding guide 206 passes through the lower conveyance guide section 304 provided at the rear portion of the main body-mounted sheet feeding unit 300, and is then fed into the sheet reversing unit 400.

The sheet reversing unit 400 is for reversing the sheet to form an image on both sides of the sheet and sending the sheet back to the printer main body 100, and the unit main body 404 has a rear end upper surface and a front end upper surface. Seat entrance 4
05 and a sheet outlet 406, and a conveyance guide 407 and a conveyance guide 4 for conveying a sheet to a sheet distribution unit mounted in a lower portion (not shown).
A guide piece 408 which is appropriately operated by a switching means provided in the sheet distribution unit for switching the sheet to 07
Is equipped with.

Further, an alignment portion 409 for aligning the inverted sheets is provided in the unit main body 404, and a substantially S-shape is provided between the alignment portion 409 and the sheet receiving port 405. An inversion path 410 is formed.
The reversing path 410 includes an upper path 430 that extends substantially horizontally from the sheet receiving opening 405 to the sheet sending outlet 406, and a lower path that draws a large arc downward from the end of the upper path 430 that extends to the vicinity of the sheet sending opening 406. The lower path 431 is provided with a paper feed / ejection roller 414 that can rotate in the forward and reverse directions, and a guide member 415 of the alignment portion 409 is provided in the vicinity of the paper exit 418 of the lower path 431. It extends almost straight horizontally. In addition, the guide member 41
The driving means 432 of the matching unit 409 for driving the
It is arranged in a space 437 surrounded by the upper path 430, the lower path 431 and the guide member 415. In this embodiment, in order to handle the jam generated in the sheet reversing unit 400, a part of the reversing path 410 and the matching portion 409 are put together on the front side of the unit main body 404 (the right side of the printer main body 100 in FIG. 2). It is designed to be pulled out. That is, the unit main body 404
In the inside of the conveyance roller 4 arranged in the upper path 430,
It has a structure that can be separated between 12 and 413.

Therefore, the sheet guided from the sheet receiving port 405 into the unit main body 404 has its image forming surface reversed while being conveyed through the S-shaped reversing path 410, and the sheet feeding / discharging roller arranged at the end thereof. Alignment unit 4 by 414
It is sent to 09. In the aligning unit 409, the guide member 415 slides according to the size of the sheet and regulates the sheet in the left-right direction to correct the sheet. Then, the sheet feeding / discharging roller 414 is rotated in the reverse direction so that the sheet in the aligning section 409 is reversed by the one-way regulation guide 419 using an elastic thin plastic plate provided at the sheet discharge port 418 of the reversing path 410. The sheet feeding port 4 that is fed into the sheet feeding path 420 separated from the lower path 431 of the path 410 and is formed on the upper surface of the front end portion of the sheet reversing unit 400.
The paper is sent from 06 to the main body mounted paper feeding unit 300. still,
At this time, the printer body 100 and the sheet reversing unit 400
When the main body-mounted paper feeding unit 300 is stacked between the sheets and the path length is long, a new sheet is sent from the main body-mounted paper feeding unit 300 to the printer main body 100 while the sheet of the sheet reversing unit 400 is being conveyed. The conveyance time can be eliminated by performing so-called alternate paper feeding for the next printing.

An upper conveyance guide portion 305 is provided at the front end portion of the main body-mounted paper feeding unit 300 so that the inverted sheet can be passed upward as it is. The sheet that has passed through the upper conveyance guide portion 305 is sent to the image forming unit 102 of the printer body 100 described above, is printed on the opposite surface side this time, and is then conveyed to the conveyance unit 200 again.

The above-mentioned main body mounted paper feeding unit 30
0 and the main body storage / feeding unit 500 are both in front of the printer P (right side of the printer main body 100 in FIG. 2).
It has paper feed cassettes 306 and 506 that can be pulled out. The cassettes 306 and 506 are basically the sheet hoppers 307 and 50 for placing sheets.
7, separation claws 308 and 508 for locking both front side corners of the sheet placed on the sheet hoppers 307 and 507, and the front side bottom portions of the sheet hoppers 307 and 507, which are always arranged to move the sheet hoppers 307 and 507 upward. Energizing springs 309 and 509, sheet feeding rollers 310 and 510 that abut on the uppermost sheet by the spring pressure, and sheet feeding guide 3 formed in front of separation claws 308 and 508.
It is basically configured with 11, 511. Then, at the time of sheet feeding, the sheet feeding rollers 310 and 510 are selectively rotated on the sheet, and the frictional force feeds the uppermost sheet in the sheet feeding direction to separate the sheets one by one from the separating claws 308 and 508. Sheet feed guides 311 and 511
Then, the image is sent into the image forming unit 102 of the printer body 100.

3 and 4 show the main part of the sheet reversing unit according to the present invention. In this figure, reference numeral 410 indicates an inversion path arranged in the unit.
Reference numeral 420 denotes a paper feed path connected to the sheet outlet 406, and the paper exit 418 of the reversal path 410 and the paper feed opening 421 of the paper feed path 420 can be switched by a one-way regulation guide 419. Then, the paper feed path 4
20 paper feed ports 421 and the transport rollers 4 located immediately behind them
A reset sensor 423 is arranged at an appropriate position between the reset sensor 423 and the sensor 22. The reset sensor 423 is composed of an integrated light emitting element 426 and a light receiving element 427 which are arranged on both sides of the guide walls 424 and 425 forming the sheet feeding path 420, and the sheet is fed to the sheet feeding path 420. When it is conveyed, its tip is detected. Then, based on this tip detection signal, counting by a timer is started, and after counting for a predetermined time set in advance, a matching operation release signal is output to the matching unit 409. The predetermined time set in advance by the timer is the same as the time required for the leading edge of the sheet to reach the holding position P2 of the transport roller 422 from the detection position P1 of the reset sensor 423.

On the other hand, the sheet discharge port 418 of the reversing path 410.
A paper feeding / discharging roller 414 is disposed in the vicinity, and a matching portion 409 extends ahead of the paper feeding / discharging roller 414.
A sheet detection sensor 440 is also provided inside. The sheet detection sensor 440 includes an integrated light emitting element 442 and a light receiving element 4 which are arranged above and below the intermediate tray 441 on which the sheet S discharged to the aligning unit 409 is placed.
43, which is used as a timing signal for starting the aligning operation by detecting the discharge-side leading end S1 of the sheet S discharged to the aligning unit 409.

The alignment section 409 has guide members 415 having a U-shaped cross section arranged on both sides of the intermediate tray 441 and a driving means 43 arranged above the guide members 415.
2 and. As shown in FIG. 4, the guide member 415 has a release position P3 at the outermost position with respect to the intermediate tray 441, a standby position P4 at the intermediate position,
Three different positions of the innermost alignment position P5 are taken. Normally, it is located at the release position P3, but when the sheet is fed to the aligning section 409, the guide member 415 moves from the release position P3 to the standby position P4 corresponding to the sheet size and is fed onto the intermediate tray 441. Both sides of the sheet S are held by the guide members 415. When the sheet S is completely discharged to the aligning section 409, the guide member 415 slides again and is set to the aligning position P5. Similar to the standby position P4, the aligning position P5 is also determined in advance by the sheet size, and by regulating both sides of the sheet S with the guide members 415, the sheet S is straightened in the transport direction. Correct the position. Further, at the alignment position P5, both sides of the sheet S are constrained by the guide members 415, so that the sheet S also functions as a guide during sheet feeding. The release position P3 and the standby position P4 may be combined and used as one position.

The paper feeding / discharging roller 414 is shown in FIGS.
As shown in FIG.
4 and an auxiliary roller 445. Paper feed roller 444
Is fixed to a drive shaft 446 of a motor that rotates in the forward and reverse directions, and the auxiliary roller 445 is fixed to a driven shaft 449 that is connected to the drive shaft 446 by arm members 447 and 448. A pair of arm members 447 and 448 are arranged on both sides of the paper feed roller 444 and the auxiliary roller 445, and are rotatably attached to the drive shaft 446 and the driven shaft 449. Further, pulleys 450 and 451 are fixed to the drive shaft 446 and the driven shaft 449, respectively, and the auxiliary roller 445 performs the same rotation as the paper feed roller 444 by the driving force of the belt 452 spanning the pulleys 450 and 451. It has a structure that can be transmitted to.

Further, in this embodiment, a compression spring 453 mounted on the drive shaft 446 is interposed between the paper feed roller 444 and the one arm member 447. Therefore, the compression spring 453 is always kept in the arm member 447.
When the paper feed roller 444 rotates, the compression spring 453 also rotates together, and the winding end on one side of the compression spring 453 presses against the arm member 447, so that the friction force with the arm member 447 is generated. And the arm member 447 is rotated in the rotation direction of the paper feed roller 444.

Further, in this embodiment, a torque limiter 454 is provided between the other arm member 448 and the drive shaft 446. The torque limiter 454 includes a boss 455 having a built-in one-way clutch and a coil spring 456 arranged between the boss 455 and the arm member 448. The boss 455 is rotatably attached to the drive shaft 446, but in FIG.
Is connected to the one-way clutch only when is rotated counterclockwise, and the rotational force of the drive shaft 446 is transmitted to the boss 455. Further, the winding end portion of the coil spring 456 is tightly fitted into the brim portion of the boss 455 and the brim portion of the arm member 448, respectively.
The end of 6 is fixed.

Next, a case where a sheet is conveyed into the sheet reversing unit 400 having the above structure will be described. When feeding a sheet to the sheet reversing unit 400, it is first detected whether or not the previous sheet remains in the aligning unit 409. At this time, the reset sensor 423
Alternatively, one of the sheet detection sensors 440 is used as an empty sensor, and the detection signal is used as the printer main body 100.
Output to the main control means 101. If the previous sheet still remains in the alignment section 409, the next sheet is made to stand by at the position of the registration roller 105 of the printer body 100.

On the other hand, if no sheet remains in the aligning section 409, the next sheet is subjected to predetermined image processing in the printer body 100, and then the body-mounted paper feeding unit 300.
Is guided to the sheet receiving port 405 of the sheet reversing unit 400. At this time, the guide member 4 of the matching portion 409
15 is set to the standby position P4. The sheet S passes through a predetermined reversing path 410 and then passes through a lower path 431.
From the paper discharge port 418 to the paper feed roller 444 and the pinch roller 45.
It is sandwiched between 7 and the matching portion 40 by its conveying force.
It is rolled up in 9. At this time, the auxiliary roller 445
Is the compression spring 453, as shown by the solid line in FIG.
Is held at a position separated from the upper surface of the sheet S. Next, when the discharge-side leading end portion S1 of the sheet S passes through the sheet detection sensor 440, a leading end detection signal is output and counting is started. The sheet S is further aligned with the aligning section 40.
9 and arrives at a predetermined paper discharge position such that the leading end S2 on the paper feed side is located slightly ahead of the auxiliary roller 445, as shown in FIG. Then, almost simultaneously with this arrival time, a start signal of the matching operation is output to the driving means 432, whereby the guide members 415 slide inward in the lateral direction. Then, by sliding to the alignment position P5 corresponding to the sheet size, the side edge portion of the sheet S placed on the intermediate tray 441 is regulated and the lateral position of the sheet S is corrected.

Next, when a paper feed signal is output from the main control means 101 of the printer body 100, the paper feed / discharge roller 4
14 drive shaft 446 rotates in the opposite direction and feed roller 44
4 rotates counterclockwise. At this time, the action of the torque limiter 454 attached to the drive shaft 446 causes the arm member 44 to move.
8 is pressed downward, and the auxiliary roller 445 presses the sheet S against the pinch roller 458 as shown by the chain double-dashed line. Auxiliary roller 445 together with paper feed roller 444
Since it is also rotating counterclockwise, the sheet S is first fed out by the frictional force with the auxiliary roller 445, and then sandwiched by the sheet feeding roller 444. By switching the one-way regulation guide 419, the sheet S moves in the reverse path 410.
To a sheet feeding path 420 side different from Then, it is detected when the sheet feeding side front end portion S2 of the sheet S passes through the reset sensor 423, and the counting by the timer is started. At this time, the guide member 415 still maintains the aligning operation at the aligning position P5.
Both sides of the sheet S are guided when the sheet is conveyed. Then, almost at the same time that the leading end S2 of the sheet S on the sheet feeding side is held by the transport roller 422, a canceling signal of the aligning operation is output to the aligning unit 409. As a result, the driving means 432 operates to slide the guide member 415 to the release position P3 and then stops.

Therefore, in this embodiment, when the aligning operation of the aligning unit 409 is released, the sheet feeding side leading end portion S2 of the sheet S is reliably sandwiched by the transport rollers 422, so that the sheet transport posture is stable. Paper feed path 420
The sheet S will not be inclined to the left and right with respect to the conveying direction during the conveyance. Further, even when a small-sized sheet is conveyed, the sheet detection sensor 4 whose rear end (sheet discharge side front end S1) of the sheet S is inside the alignment section 409 is assumed.
Even when the sheet 40 has passed through 40, the aligning portion 409 is not released until the sheet-feed-side leading end portion S2 is sandwiched by the transport rollers 422, so that the conventional problem can be solved.
It should be noted that, regardless of the size of the sheet, even if a part of the sheet remains in the aligning unit 409 after the sheet-feed-side front end S2 of the sheet S is sandwiched by the transport rollers 422, It will be canceled.

In the above embodiment, the leading edge of the sheet is detected by the reset sensor 423 in the sheet feeding direction. However, the same reset sensor 423 detects the trailing edge of the sheet, and the detection signal is used to detect the trailing edge of the sheet. The matching operation of the matching unit 409 can be canceled. In this case, the reset sensor 423 is arranged at a position where the trailing edge of the sheet can be detected after the leading edge of the sheet is held by the transport roller 422, and the aligning section 409 is immediately set based on the detection signal from this sensor. It is to cancel.

Further, in the above embodiment, the sheet discharge to the aligning section 409 and the sheet feeding from the aligning section 409 are performed by the sheet feeding / discharging roller 414 which rotates in the forward and reverse directions. When the aligning unit is provided, the paper discharging roller and the paper feeding roller are separately arranged.

[0028]

As described above, according to the sheet reversing unit of the present invention, when the sheet is fed from the aligning section to the sheet feeding path, the leading end of the sheet is conveyed to the conveying roller arranged in the middle of the sheet feeding path. Until both sides of the sheet are nipped, the both sides of the sheet are guided by holding the aligning operation in the aligning section, and the aligning operation of the aligning section is released after the leading edge of the sheet is nipped by the transport rollers. As a result, the conveyance posture of the sheet in the paper feed path becomes stable, and the sheet does not tilt leftward or rightward with respect to the conveyance direction during the conveyance of the paper feed path.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a printer including a sheet reversing unit according to the present invention.

FIG. 2 is a schematic sectional view of a printer including a sheet reversing unit according to the present invention.

FIG. 3 is a side view showing a main part of the sheet reversing unit according to the present invention.

FIG. 4 is a plan view showing a main part of a sheet reversing unit according to the present invention.

FIG. 5 is a schematic view showing an example of a conventional sheet reversing unit.

[Explanation of symbols]

 P Printer S Sheet S2 Sheet feeding side tip 100 Printer main body 200 Conveying unit 300 Main body mounting paper feeding unit 400 Sheet reversing unit 404 Unit main body 405 Sheet receiving inlet 406 Sheet feeding outlet 409 Aligning portion 410 Reversing path 414 Paper feeding and discharging roller 415 Guide member 420 Paper feed path 422 Conveying roller 423 Reset sensor

Claims (1)

[Claims] 1. A unit main body is provided with a sheet inlet and a sheet outlet on opposite sides of the unit main body, and a single-side processed sheet sent from an image forming apparatus is introduced into the unit main body through the inlet, After transporting a predetermined reversal path formed in the main body to reverse the image forming surface of the sheet, the sheet is sent to the aligning section by the paper discharge roller, and the positional deviation of the sheet is corrected by the aligning operation of the aligning section, The aligned sheet is fed from the aligning section to a sheet feeding path different from the reversing path by a sheet feeding roller, and further, from a delivery port of the unit main body through a conveying roller provided in the middle of the sheet feeding path. In the sheet reversing unit configured to convey the sheet, the sheet detecting unit is arranged in the sheet feeding path between the sheet feeding roller and the conveying roller. Sheet reversing unit being characterized in that so as to release the matching operation of the matching unit based on the detection signal.