JP6297910B2 - Magnetic address sensor for automatic conveyor - Google Patents

Description

  In this invention, an automatic travel route is performed with a magnetic tape laid on the floor surface, and the magnetism of the magnetic tape is detected by a magnetic sensor attached to an automatic transport machine, thereby automatically carrying a load along the magnetic tape. The present invention relates to a magnetic address sensor used to detect address information on a magnetic address information plate affixed to these points in order to know the position of a passing position, a stop position, a branch point, etc. .

  In the case of an automated / unmanned baggage transport facility, when a transport device is controlled by a control device to transport a load, it is necessary to accurately recognize a passing position, a stop position, and a branch position of the transport machine. For this purpose, a code plate made of a magnetic pattern that combines the north and south poles of a magnet is installed at an appropriate position on the traveling surface of the transport machine, and a large number of magnets of a magnetic detection sensor attached to the automatic transport machine are installed. The address data of the code plate is read by the detection element, and the transport machine is controlled by the address data (for example, refer to Patent Document 1).

  By the way, in the present luggage transport by an automatic transport machine, a magnetic address sensor for detecting a stop position, a passing position, or a branch position of an automatic transport machine is placed on a wide magnetic tape plate from the least significant bit (LSB) to the lowest. The address data of a predetermined number of bits up to the upper bit (MSB) is magnetized, and the magnetic pole for the read timing signal is address data at the end adjacent to the least significant bit and the end adjacent to the most significant bit of the data. Regardless of the magnetic pole, the magnetic address information plate that is magnetized and added with a fixed polarity is detected by the magnetic detection element, and the fixed magnetic pole is confirmed. At the detected timing, magnetic address information from LSB to MSB is output as read address data (for example, patents) Document 1 reference.).

Japanese Examined Patent Publication No. 3-6522 (page 3-4, FIGS. 5-10)

  In the above-described conventional magnetic address sensor, the address data magnetic poles are continuously connected to the same magnetic pole and the read timing signal magnetic pole added to the adjacent end is the same as that of the address data of the continuous magnetic poles. When the magnetic pole and the magnetic pole for the read timing signal are different, the output timing position of the read timing signal is different and the positional relationship between the magnetic detection element for reading the address and the magnetic pole for address of each bit is different, and the address data Reading error occurs and the reliability is low.

This problem and the current situation will be described in more detail.
An example of a conventional magnetic address information board is shown in FIG. (A) shows the functional configuration and dimensions of a general 8-bit information board. (B), (C) and (D) show information board address = 0, information board address = 255, and information. Examples of magnetization of the plate address = 1 are shown.

In FIG. 5, RL is a magnetic pole for a read timing signal provided at an end adjacent to the least significant bit (LSB), and RM is a read provided at an end adjacent to the most significant bit (MSB). This is a magnetic pole for timing signals.

  The moment when the magnetic address sensor passes over this magnetic address information board, the magnetic detection element for the read timing signal of the magnetic address sensor passes just above RM and RL, and RL = S pole and RM = S pole are confirmed The read timing signal is output. The pitch of the 8-bit address detection magnetic detection element for detecting the address data is the same as the address information pitch of the magnetic address information plate, and each 8-bit magnetic detection element is approximately at the center of the magnetized magnetic information. Therefore, the magnetic information of D1 to D8 is read in response to the read timing signal, the data is latched and output as binary code position information, and held until a reset signal is input The

1) Generally, when D1 to D8 are electric signals, the S pole or non-magnetization is used as the electric signal “L” and the N pole is used as “H”. That is,
D1 to D8 = S address “0”
D1 = N D2-D8 = S Address “1”
D1 to D2 = N D3 to D8 = S Address “3”
D1 to D8 = N Address “255”
It is possible to output a general binary-digital signal and control it as 256 types of addresses from 0 to 255 in the case of 8 bits and 16 types of addresses from 0 to 15 in the case of 4 bits. It is configured.
2) For the read timing signal detection RL and RM, the S pole is generally used regardless of the address data. The magnetic detection element MSL has the RL = S pole and the MSM has both the RM = S pole. A readout timing signal is output at the moment when the S pole is detected and confirmed.
3) FIG. 6 (a) shows the positional relationship between a magnetic address information plate and a magnetic address sensor that detects the magnetic address information plate and controls the automatic conveyance device, which are conventionally used.
In actual use, the magnetic address sensor attached to the automatic transfer machine has a central portion in the width direction of the magnetic address information plate having a width of about 100 mm as shown in FIG. 5 (a), from RL to RM or from RM to RL. Pass in the direction. Therefore, when the automatic transporter passes over the magnetic address information board regardless of the passing direction, the LSB of the magnetic address information board is the LSB of the magnetic address sensor and the MSB of the magnetic address information board is the magnetic address sensor. Used to match direction with MSB.
At this time, the magnetic detection element MSL detects the S pole of the RL and the magnetic detection element MSM detects the S pole of the RM, and a data read timing signal is generated at the moment when the logical product (AND) is established. That is, it is because it is assumed that D1 to D8 of the magnetic address information plate are directly under the magnetic detection elements MS1 to MS8 of the magnetic address sensor.
When the read timing signal is generated, the magnetic detection element of the magnetic address sensor reads the data of D1 to D8, latches the read signal, and outputs it as an address signal.
In FIG. 6 (a), the magnetization of the two read timing signals and the eight address data on the magnetic address information board is generally performed at a pitch of 30 mm, and the magnetic address sensor is matched to the pitch. The magnetic detection element is also mounted. Therefore, in order for an automatic transport machine that travels at a high speed to read an address reliably and perform correct control while traveling, the generation timing of the read timing signal is very important. FIG. 6B illustrates an example in which the address of the magnetic address information plate is detected using a magnetic address sensor.
4) FIGS. 7A and 7B show changes in the magnetic flux density in the vicinity of the read timing signal detection magnetized portion generated by the conventional magnetic address information plate. (A) in FIG. 7-1 shows an example of an equal magnetic flux density curve in which the magnetic detection element at RL, D1 to D8 = S pole, address 0 (zero) discriminates, and (b) shows RL = FIG. 7B shows an example of an equal magnetic flux density curve in which the magnetic detection element at the S pole, D1 to D8 = N pole, and the address 255 has a level discrimination. FIG. The example of the equal magnetic flux density curve which discriminates is shown. Further, the solid line on the magnetic address information board indicates a curve having the same magnetic flux density as the level discrimination of the magnetic detection element of the S pole, the broken line indicates a similar curve of the N pole, and the two-dot chain line indicates the magnetic The setting distance position of the magnetic address sensor which detects an address information board is shown.
When the automatic transfer machine passes at a high speed from the magnetic information address plate RL side to the RM side in FIG. 7-1 (A), the magnetic detection element MSM of the magnetic address sensor first enters the magnetic address information plate, and from MS8 When MS1 enters MSL and finally MSL enters, MSM already detects and stores the magnetic flux of RM, and when MSL detects the magnetic flux of RL, the logical product (AND) of the storage signal of MSM and the signal of MSL is established, and the read timing Generate a signal.
At the moment of receiving this read timing signal, MS1 to MS8 read and latch the data on the magnetic address information plate directly under the magnetic detection element and hold it as an address signal. Since this readout timing signal is not constant depending on conditions such as the weight of the cargo to be conveyed, the readout timing signal must be output in real time as it is detected, and is quantitatively measured by a timer circuit or the like. It cannot be corrected in a short time.
In FIG. 7-1 (a), the magnetic flux generated from the RL of the magnetic address information plate has the same magnetic pole as that of D1, so there is no break of magnetic flux between RL and D1, and there is no address. Since the same applies to RM and D8 at 0 (zero), the read timing signal can be generated only at the rising portion where the magnetic flux density generated by the RL at a position L1 away from the end face of the magnetic address information plate increases. . This is the same even when the automatic transporter travels from the RM side of the magnetic address information board to the RL side, and the read timing signal can be generated only at the rising edge of the RM outside the magnetic information board.
Essentially, when the detection surface of the magnetic address information plate is the south pole, the back side is always the north pole, and the magnetic flux emitted from the south pole returns to the north pole due to the principle of the magnet. For this reason, in the case of the address as shown in FIG. 7-1 (b), the magnetic flux density of RL is subtracted due to the influence of different magnetic poles due to D1 and D2 at the boundary with D1, and the end face side of the magnetic address information plate is Under the influence of the return magnetic fluxes of D1 to D8 being added, the magnetic flux density increases to a position far from the end face of the magnetic address information plate.
The distance L1 of the RL portion in FIG. 7-1 (a) is generally about 10 mm, although it varies depending on the strength of the magnetic lines generated by the magnetic address information plate and the detection sensitivity of the magnetic address sensor. The distance of L2 of 1 (b) is as large as about 20 mm. Accordingly, an error of the output point of the read timing signal is generated about 10 mm. The difference of 10 mm is left as it is as the center misalignment between the magnetic address information plates D1 to D8 and the magnetic detection elements MS1 to MS8 of the magnetic address sensor for reading the magnetic flux, which causes a reading error and greatly reduces reliability. This is the cause of malfunction. This is because the magnetic flux density distribution of the 30 mm pitch magnetic address information board exceeds ± 15 mm from the center point and becomes the next bit area, so the center part of the pitch is the highest, and when it is shifted 10 mm from the center, the magnetic flux density is It is greatly attenuated and it becomes difficult to read highly reliable data.
With respect to this point, an example of the equal magnetic flux density curve of the address data 85 is illustrated in FIG.
As can be seen from FIG. 7-2 (d), the generation of the read timing signal due to the above-mentioned causes occurs when the magnetic address sensors MS1 to MS8 are located just above the respective centers of the magnetic address information plates D1 to D8. It must be moved from the end face of the magnetic address information plate to the outside so that the magnetic detection element MSL or MSM becomes the rising edge of the timing at which the RL or RM magnetic flux of the magnetic address information plate is detected. I must. For this reason, the interval L between MSL and MS1 is L = P + (1 / 2P) + (L1 + L2) / 2. However, (L1 + L2) ÷ 2 is obtained by averaging rising edge positions in order to avoid malfunctions with various magnetization patterns.
This is shown in FIG. In FIG. 8, the solid line shows the isomagnetic flux density curve of the level discrimination value detected by the S pole sensor, and the broken line shows the isoflux density curve of the level discrimination value detected by the N pole sensor. A chain line indicates a set position of the magnetic address sensor. As can be seen from this figure, the detection point of the magnetic address sensor goes out greatly from the end face of the magnetic address information board, causing the magnetic address sensor to be much larger than the magnetic address information board, It is expensive.

The automatic transporter loads a load of several tons of weight at the designated location, so it can be stopped accurately at a predetermined position, or various operations of the magnetic guide tape stretched around the network in the factory In order to travel the point, it is necessary to branch accurately. For this reason, a magnetic address information board indicating the point is pasted on the floor during the running of the automatic transfer machine, and the magnetic data emitted from the magnetic address information board is made highly accurate and reliable by the magnetic address sensor, that is, 1) When the magnetic detection element of each bit of the magnetic address sensor is positioned at the center of the information magnetic pole of each bit of the magnetic address information plate, the read address signal for reading the address is output to read the address,
2) By reducing the size of the magnetic address sensor, it is easy to use and inexpensive.
3) An object of the present invention is to prevent an address information reading malfunction of a magnetic address sensor due to an electromagnetic wave generated by an inverter, a motor, or the like mounted on an automatic transfer machine.

The present invention solves the problems of the conventional magnetic address information plate described above,
1) An accurate read timing signal is generated, and address data is read with high accuracy, thereby eliminating an address detection error and outputting the signal as highly reliable data.
2) It is used together with the magnetic address information board, and the magnetic address sensor for detecting the data on the magnetic address information board and controlling the automatic transfer machine is made smaller by reducing the size, thereby reducing the total cost.
3) An object is to read and output an address after confirming that the magnetic address sensor is surely positioned on the magnetic address information board.

  In order to achieve the above-described object, the magnetic address sensor of the present invention has a magnetic pole magnetized at the least significant bit in the magnetic pole for reading timing signal provided at the end adjacent to the least significant bit (LSB). Magnetic address information plate magnetized with a magnet different from the magnetism magnetized at the most significant bit is provided on the magnetic pole for reading timing signal provided at the end adjacent to the most significant bit (MSB). Among the detection signals detected by the two magnetic detection elements for read timing signals provided at both ends of the magnetic address sensor, the magnetic flux density is lowered after the magnetic flux in the detection signal finally input is detected. It is configured to generate a timing signal to read the address data at the falling edge and read the address data with the read timing signal And wherein the door.

A) D1 (LSB) that defines the address data of the least significant bit is different from the magnetic pole of the read timing signal generation RL provided at the end adjacent thereto, and D8 (the address data of the most significant bit is defined) MSB) is different from the magnetic pole of the read timing signal generating RM provided at the end adjacent to the MSB), so that a non-magnetic area with a large magnetic flux density change rate must always be generated above the magnetic address information plate. Is possible. For this reason, when the automatic carrier enters from the least significant bit of the magnetic address information board, the read timing signal is at the falling portion where the magnetic detection signal is attenuated after detecting the magnetism of RL. In the case of entering from the most significant bit, a read signal can be generated at the falling portion where the magnetic density is attenuated after detecting the magnetism of the RM.
This point is not easily affected by the magnetic pattern in which the address data is magnetized, and does not change. Therefore, the dimensional positional relationship is in the center of the magnetic address information D1 to D8. ... MS8 can be accurately matched, and highly reliable address information can be detected.
Further, since the read timing signal is output only when the magnetic address sensor comes on the magnetic address information board, it is possible to reduce malfunctions due to surrounding electromagnetic waves.
B) The size of the magnetic address sensor is determined by the distance between MSL and MSM as described above.
The magnetic detection element MSL for reading timing signal generation provided in the magnetic address sensor using the magnetic address information board of the present invention is moved to the MS1 side for reading the least significant bit (LSB) D1, and magnetic detection for reading timing generation is performed. Since the element MSM can be moved to the MS8 side for reading the most significant bit (MSB) D8, the area between the MSL and the MSM is shortened, the magnetic address sensor is made smaller, and the magnetic address sensor case is filled for environmental resistance. The amount of silicon rubber and epoxy resin to be reduced can be reduced, and the cost can be reduced, and the cost of the entire magnetic address sensor system can be reduced.

(A) shows an equal magnetic flux density curve generated by the magnetic address information plate when indicating the address 0 (zero) of the magnetic address information plate used for the magnetic address sensor of the present invention. The magnetic flux density curve generated by the magnetic address information board when the address 255 of the magnetic address information board of the present invention is shown is shown. (C) shows the magnetic field when the address 85 of the magnetic address information board of the present invention is shown. 3 shows an equal magnetic flux density curve generated by an address information plate. (A) shows the positional relationship between the magnetic detection element and the magnetic address information board constituting the magnetic address sensor of the present invention, and (B) shows the case of address 0 (zero) in the magnetic address sensor of the present invention. A detailed view of a detection point that generates a read timing signal is shown. (C) is a detailed view of a detection point that generates a read timing signal when the address is an odd number in the magnetic address sensor of the present invention. (A) shows a block diagram of logical OR processing of detection signals of N pole and S pole using a window comparator when a Hall sensor is used for magnetic detection, and (B) shows an MR sensor for magnetic detection. When used, a block diagram for detecting both the N pole and the S pole using a comparator is shown. An example of a block diagram in which a read timing signal is generated only when the magnetic address sensor comes on the magnetic address information board is shown. (A) shows an example of a general magnetic address information board and its dimensions, (B) shows an example of magnetization of a conventional magnetic address information board showing address 0 (zero), and (C) shows , An example of a conventional magnetic address information board showing an address 255 is shown, and (d) shows an example of a conventional magnetic address information board showing an address 1. (A) shows the positional relationship between the magnetic detection element constituting the conventional magnetic address sensor and the magnetic address information board, and (B) shows a detection diagram of the magnetic address information board using the conventional magnetic address sensor. Show. (A) shows an example of an equal magnetic flux density curve in which a magnetic detection element discriminates a level of a read timing signal magnetized portion in the vicinity of the least significant bit when address 0 (zero) of a conventional magnetic address information board is shown. (B) shows an example of an equal magnetic flux density curve in which the magnetic detection element discriminates the level of the read timing signal magnetized portion in the vicinity of the least significant bit when the address 255 of the conventional magnetic address information board is shown. (C) shows an isomagnetic flux density curve generated by the magnetic address information board when showing the address 47 of the conventional magnetic address information board, and (D) shows the address 85 of the conventional magnetic address information board. FIG. 5 is a diagram showing an equal magnetic flux density curve generated by the magnetic address information plate. (A) shows the positional relationship between the magnetic detection element used in the conventional magnetic address sensor and the isomagnetic flux density curve in the vicinity of the least significant bit when address 0 (zero) of the magnetic address information board is shown. These show the positional relationship between the magnetic detection element of the conventional magnetic address sensor and the equal magnetic flux density curve near the least significant bit when the address 255 of the magnetic address information board is shown.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The best mode for carrying out the present invention will be described below with reference to the drawings, taking a commonly used 8-bit magnetic address information board as an example.
In the present invention, the magnetic pole for generating the read timing signal of the magnetic address information plate is magnetized with the RL at the end adjacent to the least significant bit D1 being different from the magnetism of the least significant bit, and the most significant bit D8. The RMs at the adjacent ends are magnetized with a magnetism different from that of the most significant bit. Therefore, D1 and RL and D8 and RM are always magnetized with different magnetism. Thereby, a non-magnetic area with a high rate of change in magnetic flux density can be created between D1 and RL and between D8 and RM. The magnetic flux density pattern at the point approaching non-magnetism is different in the adjacent magnetic poles, so that it falls at a narrow acute angle, is very stable in position, and hardly moves and changes depending on the address contents.

1A shows the distribution of magnetic flux density when address = 0, FIG. 1B shows the distribution of magnetic flux density when address = 255, and FIG. 1C shows the distribution of magnetic flux density when address = 85. The distribution of magnetic flux density is shown. In FIG. 1, the solid line shows the isomagnetic flux density curve of the level discrimination value detected by the S pole sensor, and the broken line shows the isoflux density curve of the level discrimination value detected by the N pole sensor. A chain line indicates a set position of the magnetic address sensor.
As can be seen from FIG. 1, the magnetic flux generated outward from the end face of the magnetic address information plate is not significantly different from the conventional one, but the rising point at which the magnetic flux density increases is not used. You can ignore it. However, the point at which the magnetic flux density generated between D1 and RL and D8 and RM approaches a magnetism that attenuates at an acute angle can be used for read timing signal generation.

Therefore, the generation of the read timing signal is
1) When the MSM side of the magnetic address sensor enters from the RL side of the magnetic address information plate toward the RM side, the magnetic detection elements MS1 to MS8 are just at the point A that approaches the non-magnetism after the magnetic detection element MSL detects RL. If it is arranged so as to be directly above the center of D1 to D8 and the magnetic detection element MSL detects the RL and then outputs a read timing signal at a point approaching no magnetism, the MS1 to MS8 are respectively directly above the centers of D1 to D8. Therefore, the data on the magnetic address information board can be read accurately and reliably.

Since the magnetic pole for the read timing signal changes depending on the N pole or the S pole and the address data, both of the magnetic poles must be detected.
Therefore, in general, an analog output Hall element that can detect either the N pole or the S pole is amplified and converted into a digital signal by a window comparator, and then the N pole detection signal and the S pole detection signal are used. Thus, the read timing signal can be detected regardless of which magnetic pole is used. Generally, the falling edge of the logical sum signal (OR) is used as a read timing signal. This is shown in FIG.

In FIG. 3A, the Hall element outputs a midpoint voltage whose output voltage is approximately ½ of the power supply voltage when there is no magnetism, and when magnetism is applied, the Hall element increases or decreases the output depending on the direction of application of magnetic flux polarity. Can do. For example, if magnetism is applied in such a direction that the output increases when the N pole is applied, the output decreases when the S pole is applied. Therefore, when the signal is amplified and input to the window comparator, OUT N outputs a detection signal in the case of N pole detection, and OUT S outputs a detection signal in the case of S pole detection. When both signals are input to an OR circuit (OR circuit), a detection signal can be output with either N or S polarity. The falling edge of the OR circuit output is used as a read timing signal.

As another method, even if a bipolar detection signal using an MR element that can be detected regardless of the polarity if it is impossible to distinguish between the S pole and the N pole and has magnetism, the falling edge is similarly detected. Can be generated at the same point. This is shown in FIG. In addition, for the magnetic detection of D1 to D8, a detection signal of only N poles may be used when detecting only N poles using a single pole detection element or using a Hall element.

FIG. 2A shows the positional relationship between the magnetic address information plate used in the present invention and the magnetic detection element of the magnetic address sensor of the present invention. 2B and 2C show the detailed positional relationship between the magnetic address information plate used in the present invention and the point A which is the read timing signal generation point of the magnetic detection element of the magnetic address sensor of the present invention.

When the MSL side of the magnetic address sensor enters from the RM side of the magnetic address information board toward the RL side, the data detection timing signal of MS1 to MS8 is sent at the point B that approaches the non-magnetism after the magnetic detection element MSM detects RM Output. The distance between point A with respect to D1 and the distance between point B with respect to D (because the different magnetic poles are adjacent to each other, the rate of change in magnetism is large, and the movement of the position is very small and stable due to the magnetization pattern due to the address change. .

2) However, the automatic transfer machine is equipped with an inverter having a large power for speed control of the traveling motor, and generates an excessive leakage magnetic flux and a large common mode noise. For this reason, in the magnetic address sensor of the present invention, in order to avoid malfunction in these environments, the magnetic address sensor detects the magnetism of the magnetic address information plate, whichever is first, MSL or MSM, and the magnetic address sensor After confirming that it is on the address information board, a read timing signal is generated at the falling edge of the other signal that is input last, and the magnetic information of D1 to D8 is read. This will be described with reference to FIG.

The MSL and MSM magnetic sensors are each detected and compared by a window comparator via an amplifier, output as N-pole and S-pole detection signals, processed by an OR circuit, and then MSL and MSM magnetic detection signals, respectively. Is generated. The detection signals are latched and stored, and after being inverted by an inverting circuit in order to make the falling signal of the signal easier to differentiate, are converted into rising signals and differentiated by the differentiating circuit. Therefore, when the detection signal input and latched earlier and the differential output input later are processed by the AND circuit, a read signal is generated at the falling edge of the MSL or MSM magnetic detection input last. .

As is clear from FIG. 4, it is possible to generate exactly the same read timing signal for either of the two signals and after which of the two signals. That is, since it is not possible to generate a read timing signal unless it is confirmed that the magnetic address sensor is on the magnetic address information board, the magnetic address sensor can be made highly reliable.

3) As is clear from the above description, the magnetic detection element for generating the read timing signal can be shifted to the MS1 side and the MSM to the MS8 side, unlike the conventional product. Since the size of the magnetic address sensor is determined by the distance from the MSL to the MSM, it can be significantly reduced as compared with the conventional method.

  The magnetic address sensor according to the present invention is widely used in the field of automatic transport systems that transport materials and products on transport machines in unmanned and labor-saving facilities such as factories and warehouses. .

N, S Magnetic polarity RL Magnetic pole RM magnetic address information provided at the end adjacent to the least significant bit of the magnetic address information plate and for generating a read signal when the automatic carrier enters from the least significant bit direction A magnetic sensing element for detecting a least significant bit of a magnetic address sensor provided at an end adjacent to the most significant bit of the plate for generating a read signal when an automatic transporter enters from the direction of the most significant bit; The distance between the magnetic detection element for generating the read timing signal at the end adjacent to the least significant bit, or the magnetic detection element for detecting the most significant bit of the magnetic address sensor and the edge adjacent to the most significant bit. Distance L1 between magnetic detection element for reading timing signal generation and magnetic pole for data of least significant bit and reading magnetic pole for generation of reading timing signal adjacent thereto, or Is the distance L2 from the end face of the magnetic address information plate to the detection point when the most significant bit data magnetic pole and the adjacent read timing signal generating magnetic pole are the same, and the least significant bit data magnetic pole and the adjacent read timing Distances D1 to D8 from the magnetic address information plate end face when the signal generating magnetic pole or the most significant bit data magnetic pole is different from the adjacent read timing signal generating magnetic pole D1-D8 Magnetized address data D1 Least significant bit for defining a magnetized address D8 Most significant bit for defining a magnetized address MSL Provided at the end adjacent to the least significant bit of the magnetic address sensor, Magnetic detecting element M for detecting the magnetic flux of RL and generating a read signal when entering from the lower bit direction M Magnetic detecting element MS1 provided at an end adjacent to the most significant bit of the magnetic address sensor for detecting a magnetic flux of RM and generating a read signal when the automatic carrier enters from the most significant bit direction. MS8 Magnetic detecting element for detecting address data of magnetic address sensor MS1 Magnetic detecting element for detecting address data of least significant bit MS8 Magnetic detecting element for detecting address data of most significant bit P Magnetization pitch of magnetic data A Read signal generation point when automatic carrier enters from the least significant bit direction B Read signal generation point when automatic carrier enters from the most significant bit direction

Claims (3)

A plurality of magnetic poles indicating the address data of the magnetic address information plate are arranged in parallel, and are attached to an automatic transport machine that passes above the magnetic address information plate in which a predetermined number of bits of address data are magnetized by S and N magnetic poles. In a magnetic address sensor for an automatic transport machine that detects a position of a passing point through which the automatic transport machine passes by detecting by a magnetic detection element,
The magnetic address information board has a data read timing with a polarity different from the polarity of the least significant bit and the most significant bit at one end adjacent to the least significant bit defining the address data and the other end adjacent to the most significant bit. A magnetic pole for signal is added, and a magnetic detection element for data read timing signal is provided on both ends of the plurality of parallel magnetic detection elements, and the two magnetic detection elements for data read timing signal are provided. Falling edge of the data read timing signal generated when the magnetic flux density of the magnetic pole for the data read timing signal in the detection signal that is finally input among the detection signals detected by each decreases after the level discrimination value To read the address data on the magnetic address information board Magnetic address sensor for an automatic transfer machine, characterized in that the. Of the detection signals detected by the two data reading timing signal magnetic detection elements, the first detection signal that is detected and input is used as a confirmation signal for confirming that the signal has entered the upper part of the magnetic address information board. The address signal of the magnetic address information plate is read by outputting a data read timing signal only when the confirmation signal is present by a detection signal detected and inputted at the other end. 2. A magnetic address sensor for automatic conveyors according to 1. 3. The magnetic address sensor for an automatic carrier according to claim 1, wherein detection of the magnetic pole for data reading timing signal on the magnetic address information board is bipolar magnetic detection performed for both S and N magnetic poles.

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