JP2010014441A - Tray recognizing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tray recognizing apparatus capable of more accurately controlling the position of a code reader for reading a code showing data for discriminating trays. <P>SOLUTION: In the tray recognizing apparatus with a plurality of tray arranging parts 32a-32e for arranging specimen dispensing trays 30 housing a plurality of daughter specimen containers 31 for dispensing a specimen and constituted so as to irradiate a code recording part, on which bar codes 34a-34c showing the data provided to the specimen dispensing trays 30 to discriminate the specimen dispensing trays 30 are recorded, with light to read the bar codes 34a-34c by the barcode reader 40, the light from the barcode reader 40 is detected by the position detecting parts 50a-50e provided to the tray arranging parts 32a-32e to detect that the barcode reader 40 is moved to a code reading position reading the bar codes 34a-34c of the specimen dispensing trays 30. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a tray recognition device that identifies a plurality of trays on which containers used for dispensing specimens and the like are placed.

  Dispensing devices for dispensing a liquid sample from an original sample container in which a liquid sample (sample or reagent) is placed into a child sample container for automatic analysis are widely used. In the dispensing device, for example, a plurality of trays on which a plurality of child sample containers are arranged are prepared, and a liquid reagent is dispensed from the original sample container to the child sample containers of the tray using a nozzle chip or the like. The liquid sample dispensed into the child sample container is identified and managed in tray units (or child sample container units).

  As a tray recognition device used for tray identification in such a dispensing device, for example, a barcode representing identification information is provided for each of a plurality of trays, and each barcode is read by a movable barcode reader. A device that recognizes a tray is known (see Patent Document 1).

JP 2007-57332 A

  In the tray recognition apparatus as in the above prior art, as a method for controlling the position of the barcode reader with respect to each tray, for example, the movement distance is calculated by the amount (number) of pulses sent to the motor of the driving device that drives the barcode reader. In general, a method for controlling the position, a method for detecting the rotational speed of the motor with an encoder, calculating a moving distance from the rotational speed, and controlling the position are generally used.

  However, in the method of indirectly detecting the position of the bar code reader from the command to the motor or the operation of the motor in this way, the detection position of the bar code reader is detected due to slippage in the power transmission portion of the driving device or malfunction of the motor. If a deviation occurs from the actual position, the position of the bar code reader cannot be correctly controlled, and the tray may be erroneously recognized.

  The present invention has been made in view of the above, and is a tray recognition device that can more accurately control the position of a code reading device that reads a code representing information for identifying a tray and suppress erroneous recognition of the tray. The purpose is to provide.

  In order to achieve the above object, the present invention provides a tray containing a plurality of containers for dispensing a sample, a plurality of tray placement portions for placing the tray, and the tray provided to identify the tray. A code description part in which a code representing information to be recorded is written; a code reading device that reads the code by irradiating light to the code description part of the tray; a moving mechanism that moves the code reading device; A position detector that is provided in at least one of the tray arrangement portions of the tray and detects that the code reader has moved to a code reading position for reading the code on the tray by receiving light from the code reader. Shall be provided.

  In the present invention, the position of a code reading device that reads a code representing information for identifying a tray can be more accurately controlled, and erroneous recognition of the tray can be suppressed.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  FIG. 5 is a diagram showing an overall configuration of a dispensing apparatus to which the present invention is applied. In the following, the direction corresponding to the left / right in FIG. 5 is the left / right of the dispensing device, the direction corresponding to the top / bottom is the rear / front, and the direction corresponding to the front / back is the top.・ As below.

  The dispensing apparatus according to the present embodiment shown in FIG. 5 dispenses a liquid sample from a dispensing source sample container 12 containing a liquid sample (sample or reagent) to a child sample container 31 for automatic analysis. There is a predetermined position (dispensing position) where the original sample container transport rack 11 taken in from a main transport line (not shown) provided on the rear side (upper side in FIG. 5) of the dispensing apparatus is dispensed. ), And after the completion of dispensing, the conveyance unit 110, the dispensing tray mounting unit 130 on which the sample dispensing tray 30 holding the plurality of child sample containers 31 is placed, and the dispensing source A chip rack mounting section 120 for mounting a chip rack 20 holding a plurality of nozzle chips 21 used in a dispensing mechanism (not shown) for dispensing a liquid sample from the sample container 12 to the child sample container 31; .

  The transport unit 110 has a sampling line 10 that transports the original sample container transport rack 11. The original sample container transport rack 11 holds a plurality of (for example, five) dispensing source sample containers 12 in which liquid samples (samples and reagents) are stored. It is transported to the dispensing position together with the rack 11.

  The chip rack mounting unit 120 has a plurality of (a plurality of nozzle tips 21 arranged in an upright manner (not shown) used for dispensing a liquid sample from the dispensing source sample container 12 to the child sample container 31 (not shown). For example, three chip racks 20 are arranged in the left-right direction of the dispensing device.

  The dispensing tray mounting unit 130 is provided on the front side of the dispensing apparatus, and the operator installs, collects, and replaces the sample dispensing tray 30 from the front side of the dispensing apparatus.

  Next, the details of the dispensing tray mounting unit 130 will be described with reference to FIG. FIG. 1 is a perspective view showing the dispensing tray mounting portion 130 of the dispensing apparatus according to the present embodiment. In the example, three sample dispensing trays 30 are arranged on the dispensing tray mounting portion 130. Is shown. In FIG. 1, an X axis is defined in the left-right direction of the dispensing device, a Y axis is defined in the front-rear direction, and a Z axis is defined in the up-down direction.

  In FIG. 1, the dispensing tray mounting portion 130 has a square shape, and a tray placement table 32 arranged so that one side thereof extends along the X-axis direction, and the X-axis on the tray placement table 32. A plurality of (for example, five) tray placement sections 32a to 32e and tray placement sections 32a to 32e, which are arranged side by side in the direction, are arranged on the tray placement sections 32a to 32e. Recognizing units 39a to 39e (see FIG. 5 and the like) for detecting that the note tray 30 is arranged, and front sides of the tray arranging units 32a to 32e are arranged so as to be movable in the X-axis direction. A barcode reader 40 that reads barcodes 34a to 34c (described later) provided on the arranged sample dispensing tray 30, a moving mechanism 131 that moves the barcode reader 40, Position detectors 50a to 50e that are provided in the respective ray placement units 32a to 32e and detect that the barcode reader 40 has moved to a position (code reading position) for reading the barcodes 34a to 34c of the sample dispensing tray 30; It has.

  Bar codes 34 a to 34 c representing information (tray identification information) for identifying the sample dispensing tray 30 are described or attached to the side surface of the sample dispensing tray 30. The tray identification information represented by the barcodes 34 a to 34 c includes, in addition to identification information for each sample dispensing tray 30, a liquid sample to be dispensed into the child sample container 31 held in the sample dispensing tray 30. Information may be expressed. The sample dispensing tray 30 is arranged in the tray arrangement portions 32a to 32e with the barcodes 34a to 34c facing the front side of the dispensing apparatus. Hereinafter, the surface on which the barcodes 34a to 34c of the sample dispensing tray 30 are described (or attached) is referred to as a code description surface.

  Each of the tray placement units 32 a to 32 e includes a plurality of guides 33 for holding the sample dispensing tray 30. The guide 33 restricts the movement of the sample dispensing tray 30 in the horizontal direction (front and rear, left and right directions of the dispensing apparatus) and supports the sample dispensing tray 30 from the lower side, whereby the sample dispensing tray 30 is placed on each of the tray placement units 32a to 32e. It is to be held and is arranged at a position corresponding to the outer peripheral portion (for example, four corners) of the sample dispensing tray 30 in each of the tray arrangement portions 32a to 32e. By this guide 33, the plurality of sample dispensing trays 30 arranged in the respective tray arrangement portions 32a to 32e are held at the same position with respect to the front-rear direction and the vertical direction (vertical direction) of the dispensing apparatus. Further, the guide 33 is arranged so that the sample dispensing trays 30 arranged in the adjacent tray arrangement parts 32a to 32e are held at equal intervals. Therefore, the code description surface of the sample dispensing tray 30 is also arranged at the same position in the front-rear direction and the vertical direction. The guide 33 is not limited to the above-described configuration. For example, the tray arrangement table 32 is provided with a recess, and the sample dispensing tray 30 is fitted and held, or the tray arrangement table 32 is provided with a groove so that the sample dispensing is performed. It is good also as a structure which hold | maintains the sample dispensing tray 30 by providing a convex part in the tray 30 and fitting.

  The recognition units 39a to 39e are, for example, a switch that detects that the sample dispensing tray 30 has been arranged in the tray arrangement units 32a to 32e by being pushed and switched by the sample dispensing tray 30, or the sample dispensing tray 30. When detecting that the sample dispensing tray 30 is arranged in the tray arrangement units 32a to 32e, a detection signal is transmitted to a host control device (not shown).

  The barcode reading device 40 is disposed on the front side of the tray placement portions 32a to 32e, in other words, on the code writing surface side of the sample dispensing tray 30 placed on the tray placement portions 32a to 32e. The barcode reader 40 is slidably supported by a linear guide mechanism (not shown) such as a linear guide or a spline shaft provided in the X-axis direction along the tray arrangement portions 32a to 32e. It can move in the X-axis direction along the arrangement of the tray placement portions 32a to 32e. The barcode reader 40 provided in this way has a light emitting element 41 that irradiates light to the barcodes 34a to 34c of the sample dispensing tray 30 on the rear side (tray placement portions 32a to 32e side) (see FIG. 4 described later). And an imaging element 44 (see FIG. 4 below) that receives reflected light from the barcodes 34a to 34c (in other words, images the barcodes 34a to 34c).

  The moving mechanism 131 is wound around two pulleys 37a and 37b that are rotatably provided near the left and right ends of the front side of the tray arrangement table 32, and is wound around the two pulleys 37a and 37b, along the tray arrangement portions 32a to 32e. And a timing belt 38 disposed in the X-axis direction, and a drive device 36 (for example, a motor) that is provided on the rotation shaft of the pulley 37b and rotationally drives the pulley 37b. The timing belt 38 is connected to the barcode reader 40, and the barcode reader 40 linearly moves in the X-axis direction along the linear guide mechanism by driving the pulley 37b by the driving device 36. The initial position (reference position) of the barcode reader 40 is the left end of the movement range, and the apparatus waits at this initial position except during the operation (during the barcode reading operation). The operation of the driving device 36 of the moving mechanism 131, that is, the operation of the barcode reading device 40 (position in the X-axis direction) is controlled by a host control device (not shown).

  The position detectors 50a to 50e receive the light emitted from the light emitting element 41 of the barcode reader 40, so that the barcode reader 40 reads the barcodes 34a to 34c of the sample dispensing tray 30. It is detected that it moved to. Here, the code reading position is a position where the barcode reading device 40 reads each of the barcodes 34a to 34c, and a position at which the barcode 34a to 34c to be read by the image sensor 44 can be imaged (readable position). However, for example, the image sensor 44 of the barcode reader 40 and the code description surface of the sample dispensing tray 30 face each other, and the image sensor 44 is within a distance where the barcodes 34a to 34c can be imaged. Is a code reading position.

  The position detection units 50a to 50e are positions between the tray arrangement units 32a to 32e and the barcode reading position of the barcode reading device 40 and positions that do not hinder reading of the barcodes 34a to 34c by the barcode reading device 40, For example, the tray placement portions 32a to 32e are respectively arranged near the right front corner.

  Next, details of the position detectors 50a to 50e will be described with reference to FIGS.

  FIG. 2 is an enlarged front view showing the position detector, and FIG. 3 is a cross-sectional view taken along the line AA. The plurality of position detection units 50a to 50e have the same configuration, and in FIGS. 2 and 3, the position detection unit 50a is shown as a representative.

  2 and 3, the position detector 50a includes a long plate-like support member 52 provided on the tray arrangement table 32 along the Z-axis direction, and the front side of the support member 52 (on the barcode reading device 40 side). A light receiving element 51 that outputs a detection signal according to the amount of received light, and an incident direction limiting cylinder 53 that covers the light receiving element 51 and restricts the direction of light incident on the light receiving element 51. It has.

  A slit portion 53 a that allows light to pass therethrough is provided on the front side of the incident direction restricting tube 53 (on the barcode reading device 40 side). Only the light that has passed through the slit portion 53 a is incident on the light receiving element 51, and the other light is blocked by the incident direction limiting cylinder 53. Of the light incident on the slit portion 53a, the light incident on the slit portion 53a from the front direction of the slit portion 53a (the front side in the direction orthogonal to the paper surface in FIG. 2 and the left side in FIG. 3) passes through the slit portion 53a and is received. Incident on the element 51. Further, as the angle between the incident direction of the incident light to the slit portion 53a and the front direction of the slit portion 53a increases, the ratio of the incident light passing through the slit portion 53a decreases, and the light incident on the light receiving element 51 is reduced. Decrease. The slit portion 53a may have any shape that allows light to pass through or is blocked as described above. Therefore, the shape seen from the front direction of the slit portion 53a (the front side in the direction orthogonal to the paper surface in FIG. 2) is, for example, circular or A substantially circular shape such as an ellipse may be used.

  The position detection unit 50a is installed with the front direction of the slit portion 53a of the incident direction limiting cylinder 53 facing the direction of the light emitting element 41 of the barcode reading device 40 at the code reading position of the tray arrangement unit 32a. That is, when the barcode reading device 40 is moved to the code reading position of the tray placement unit 32a, the light emitted from the light emitting element 41 of the barcode reading device 40 passes through the slit portion 53a and enters the light receiving element 51. The As a result, it is detected that the barcode reader 40 has moved to the code reading position of the tray placement unit 32a.

  In addition, when the light emitting element 41 of the barcode reader 40 has a width in the X-axis direction (left-right direction) (or when the light-emitting elements 41 are arranged side by side in the plurality of X-axis directions), the incident direction is limited. The front direction of the slit portion 53a of the cylinder 53 is set toward the right end portion of the light emitting element 41 of the barcode reading device 40 at the code reading position of the tray arrangement portion 32a, and the barcode reading device 40 is moved from the initial position (direction). By moving and detecting the right end of the light emitting element 41, it can be detected that the bar code reader 40 has moved to the code reading position of the tray placement section 32a.

  The same applies to the other position detection units 50b to 50e.

  Next, details of the barcode reader 40 and the position detector 50a and the operation principle will be described with reference to FIG.

  FIG. 4 is a circuit diagram showing a schematic configuration of the barcode reader 40 and the position detector 50a. In FIG. 4, the position detector 50a is shown as a representative, and the description of the position detectors 50b to 50e is omitted.

  In FIG. 4, the barcode reader 40 includes a light emitting element 41, a resistor 42, a switch unit 43, a power source 60 a, a ground unit 61 a, and an image sensor 44.

  The light emitting element 41 irradiates light to the barcodes 34 a to 34 c of the sample dispensing tray 30 (for example, LED: Light Emitting Diode), and a resistor 42 that limits (adjusts) the current supplied to the light emitting element 41. Is connected to the power source 60a via the switch, and is connected to the grounding part 60a via the switch unit 43 that switches the current supplied to the light emitting element 41.

  The switch unit 43 has an energizing position for supplying current to the light emitting element 41 and a blocking position for interrupting supply of current to the light emitting element 41. When the switch unit 43 is switched to the energized position, a current is supplied to the light emitting element 41, and light is emitted from the light emitting element 41 to the barcodes 34a to 34c. The switching operation of the switch unit 43 is controlled by a host control device (not shown).

  The imaging device 44 is, for example, a CCD (Charge Coupled Device), reads the barcodes 34a to 34c by imaging the barcodes 34a to 34c, and displays the tray identification information represented by the barcodes 34a to 34c. To a control device (not shown).

  The position detection unit 50a includes a light receiving element 51, a resistor 54, a comparator 55, a power source 60b, and a grounding unit 61b.

  The light receiving element 51 is connected to the power source 60 b and is connected to the ground part 61 b through the resistor 54. The voltage on the power supply 60 b side of the resistor 54 is input to the comparator 55.

  The light receiving element 51 is, for example, a phototransistor, and causes a current (detection signal) corresponding to the amount of incident light to flow from the power supply 60b to the ground portion 61b side (resistor 54 side).

  The resistor 54 is a variable resistor having means for changing the resistance value. The current flowing through the light receiving element 51 flows into the resistor 54, and a voltage corresponding to the resistance value of the resistor 54 and the magnitude of the current is generated on the power supply 60b side of the resistor 54 (the current is converted into a voltage). Even if the current flowing from the light receiving element 51 to the resistor 54 is the same, the voltage generated on the power supply 60b side of the resistor 54 can be adjusted by changing the resistance value of the resistor 54.

  The comparator 55 compares the input voltage (voltage on the power supply 60b side of the resistor 54) with a predetermined threshold value. The output of the comparator 55 is connected to an upper control unit (not shown) via a signal line 56, and the comparison result is output to the control device.

  In the position detection unit 50a configured in this way, the voltage generated according to the amount of light incident on the light receiving element 51 is compared by the comparator 55, so that the light receiving element 51 is connected to the light receiving element 51 from the light emitting element 41 of the barcode reader 40. By determining, as a threshold value, a value between the voltage when the light is incident and the voltage when the light is not incident, it is detected that the light is incident from the light emitting element 41 to the light receiving element 51, and the upper control device To be told. Further, by changing the resistance value of the resistor 54, the conversion ratio of the voltage generated on the power supply 60b side of the resistor 54 with respect to the current flowing from the light receiving element 51 to the resistor 54 (in other words, the light detection sensitivity by the light receiving element 51) is adjusted. be able to.

  The same applies to the other position detection units 50b to 50e.

  The operation of the present embodiment configured as described above will be described.

  The operator arranges (or replaces) the sample dispensing tray 30 at a desired position (for example, the tray arranging units 32a to 32e shown in FIG. 1) of the tray arranging units 32a to 32e before starting the dispensing operation. At this time, it is detected by the recognition parts 39a-39e provided in each tray arrangement | positioning part 32a-32e that the dispensing tray 30 has been arrange | positioned (exchanged) in tray arrangement | positioning part 32a-32c.

  Next, when a command for starting the dispensing process is input to the host control device by the operator, the barcode reader 40 is dispensed by the moving mechanism 131 of the dispensing tray mounting unit 130 according to the command from the control device. It is driven rightward from the left end (initial position) of the device. When the barcode reading device 40 reaches the barcode reading position of the tray placement unit 32a, light from the light emitting element 41 of the barcode reading device 40 passes through the slit portion 53a of the position detection unit 50a and enters the light receiving element 51. The detection signal is output from the comparator 55 to the upper control unit. When the detection signal is input, the upper control unit stops driving the barcode reader 40 by the moving mechanism 131. As a result, the barcode reader 40 stops at the barcode reading position of the tray placement unit 32a. The code reading device 40 reads the barcode 34a of the sample dispensing tray 30 at the code reading position, and transmits the tray identification information represented by the barcode 34a to the upper control device.

  The barcodes 34b and 34c of the sample dispensing tray 30 arranged in the other tray arrangement units 32b and 32c are similarly read, and the tray identification information represented by the barcodes 34b and 34c is transmitted to the upper control device. .

  Thereafter, the child sample of the sample dispensing tray 30 arranged in the tray arrangement units 32a to 32c from the dispensing source sample container 12 of the original sample container carrying rack 11 taken in from the main conveyance line and conveyed to the dispensing position. A liquid sample (specimen or reagent) is dispensed into the container 31 by a dispensing mechanism.

  The effect of the present embodiment configured as described above will be described.

  A method of controlling the position by calculating the moving distance based on the amount (number) of pulses sent to the motor of the driving device that drives the barcode reader as in the conventional tray recognition device, or the number of rotations of the motor detected by the encoder In the method of calculating the moving distance from the position and controlling the position, when a deviation occurs between the detected position of the barcode reader and the actual position due to slippage in the power transmission portion of the driving device or malfunction of the motor, The position of the bar code reader could not be correctly controlled, and there was a risk of misrecognizing the tray. Another possible method is to read the barcode of each specimen dispensing tray and determine whether the barcode reader is in the correct position from the contents. In this case, register the barcode of the specimen dispensing tray in advance. It is necessary to do this, and the work becomes complicated.

  In the present embodiment, the position detectors 50a to 50e are provided in the tray placement portions 32a to 32e on which the sample dispensing tray 30 is placed, and the barcode reading device 40 has the code reading positions of the tray placement portions 32a to 32e. Therefore, the position of the barcode reader 40 can be directly detected, the position of the code reader 40 can be controlled more accurately, and erroneous recognition of the sample dispensing tray 30 can be suppressed. it can.

  Further, the position detectors 50a to 50e provided in the respective tray placement units 32a to 32e detect the position of the barcode reader 40 by receiving light from the light emitting element 41 of the barcode reader 40. Compared with the case where the position of the bar code reader 40 is detected by arranging a position detecting unit constituted by a light emitting element and a light receiving element in the tray arranging parts 32a to 32e, the number of members can be reduced.

  In the present embodiment, the position detectors 50a to 50e that detect light from the light emitting element 41 of the barcode reader 40 are provided to detect the position of the barcode reader 40. Without being limited thereto, a switch for detecting contact may be provided in each of the tray placement units 32a to 32e instead of the position detection units 50a to 50e. In this case, when the barcode reading device 40 is moved to the code reading position of each of the tray placement portions 32a to 32e, each barcode is read by arranging each switch so that the barcode reading device 40 and the switch are in contact with each other. The position of the device 40 can be detected.

  Further, in the present embodiment, the position detection units 50a to 50e are provided in all of the plurality of tray arrangement units 32a to 32e. However, the present invention is not limited to this, and the moving mechanism 131 that moves the barcode reader 40 is used. In the tray recognition device that calculates (moves) the moving distance of the barcode reading device 40 based on the amount (number) of pulses sent to the motor, and controls (detects) the position, any one (or a plurality) of the plurality of tray arrangement portions 32a to 32e. A position detection unit may be provided to detect the position of the barcode reader 40.

  In the present embodiment, the case where the barcode reader 40 using the light emitting element 41 (for example, LED) and the image pickup element 44 (for example, CCD) is used has been described as an example. Instead of the light emitting element 41, a laser light source may be used, and the barcodes 34a to 34c may be read by reflected light from the barcodes 34a to 34c by laser light. In this case, the position detectors 50a to 50e detect the position of the barcode reader 40 by detecting the laser light from the laser light source.

It is a perspective view which extracts and shows the dispensing tray mounting part of the dispensing apparatus in this Embodiment. It is a front view which shows the detail of a position detection part. It is a longitudinal cross-sectional view which shows the detail of a position detection part. It is a circuit diagram which extracts and shows a barcode reader and a position detection part. It is a figure which shows the whole structure of the dispensing apparatus with which this invention is applied.

Explanation of symbols

10 Sampling Line 11 Original Sample Container Transport Rack 12 Dispensing Source Sample Container 20 Chip Rack 21 Nozzle Tip 30 Sample Dispensing Tray 31 Child Sample Container 32 Tray Placement Tables 32a to 32e Tray Placement Section 33 Guides 34a to 34c Bar Code 35a 35e Position detector 36 Drive units 37a, 37b Pulley 38 Timing belt 40 Barcode reader 41 Light emitting element 42 Resistor 43 Switch unit 44 Image sensor 50a-50e Position detector 51 Light receiving element 52 Support member 53 Incident direction limiting cylinder 53a Slit Unit 54 Resistor 55 Comparator 56 Signal lines 60a and 60b Power supplies 61a and 61b Grounding unit 110 Transport unit 120 Chip rack mounting unit 130 Dispensing tray mounting unit 131 Moving mechanism

Claims (4)

A tray containing a plurality of containers for dispensing samples;
A plurality of tray placement portions for placing the trays;
A code description part provided on the tray and in which a code representing information for identifying the tray is written;
A code reader for reading the code by irradiating light on the code description part of the tray;
A moving mechanism for moving the code reader;
Position detection that is provided in at least one of the plurality of tray placement portions and detects that the code reading device has moved to a code reading position for reading the code on the tray by receiving light from the code reading device. A tray recognition device. The tray recognition device according to claim 1,
A tray recognition apparatus, further comprising incident direction limiting means for limiting a direction of light incident on the position detector from the code reader. The tray recognition device according to claim 1,
A tray recognition apparatus, further comprising sensitivity adjustment means for adjusting sensitivity of the position detector. A tray containing a plurality of containers for dispensing samples;
A plurality of tray placement portions for placing the trays;
A code description part provided on the tray and in which a code representing information for identifying the tray is written;
A code reader for reading the code by irradiating light on the code description part of the tray;
A moving mechanism for moving the code reader;
A tray provided in at least one of the plurality of tray placement portions and provided with a detection switch for detecting movement of the code reading device to the code reading position by contacting the code reading device. Recognition device.

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