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CN-115319011-B - Fastening tool

CN115319011BCN 115319011 BCN115319011 BCN 115319011BCN-115319011-B

Abstract

The invention provides a fastening tool. The fastening tool has a motor, an anvil, a pin grip, a magnet, a first magnetic sensor, a second magnetic sensor, and a control device. The magnets are arranged such that the N pole and the S pole are aligned in the front-rear direction, and move in the front-rear direction integrally with the pin holding portion. The second magnetic sensor is disposed at a position rearward of the first magnetic sensor. The control device moves the pin holding part backward from the initial position to the stop position according to the detection result of the second magnetic sensor, and moves the pin holding part forward from the stop position to the initial position according to the detection result of the first magnetic sensor. The first magnetic sensor and the second magnetic sensor are monopole detection type sensors configured to detect the same predetermined magnetic pole of the magnet, and are arranged such that the orientation of the first detection surface with respect to the movement axis of the magnet is opposite to the orientation of the second detection surface with respect to the movement axis of the magnet. Accordingly, the detection accuracy of the first magnetic sensor and the second magnetic sensor can be improved.

Inventors

  • The shaft is too tight
  • Kyoku Motoki

Assignees

  • 株式会社牧田

Dates

Publication Date
20260508
Application Date
20220211
Priority Date
20210510

Claims (16)

  1. 1. A fastening tool configured to fasten a work using a fastener including a pin and a cylindrical portion, characterized in that, Comprising a motor, an anvil, a pin holding part, a magnet, a first magnetic sensor, a second magnetic sensor and a control device, wherein, The anvil is capable of abutting against the cylindrical portion; The pin gripping portion is configured to grip the pin and is configured to move relative to the anvil along a first axis by power of the motor, wherein the first axis defines a front-rear direction of the fastening tool; the magnets are arranged such that N-poles and S-poles are aligned in the front-rear direction, and are configured to move integrally with the pin grasping portion in the front-rear direction along a second axis parallel to the first axis; The first magnetic sensor is provided with a first detection surface; The second magnetic sensor has a second detection surface, and is disposed at a position rearward of the first magnetic sensor; the control device is configured to move the pin grasping portion from an initial position to a stop position rearward relative to the anvil based on a detection result of the second magnetic sensor, and to move the pin grasping portion from the stop position to the initial position forward relative to the anvil based on a detection result of the first magnetic sensor, The first magnetic sensor and the second magnetic sensor are single-pole detection type sensors configured to detect the same predetermined magnetic pole of the magnet, The first and second magnetic sensors are configured such that an orientation of the first detection surface relative to the second axis is opposite an orientation of the second detection surface relative to the second axis.
  2. 2. The fastening tool according to claim 1, wherein, The prescribed magnetic pole is a magnetic pole arranged on the rear side of the N pole and the S pole, The first detection surface is configured to face the second axis, The second detection surface is configured to face away from the second axis.
  3. 3. The fastening tool according to claim 2, wherein, The prescribed magnetic pole is an N pole.
  4. 4. The fastening tool according to claim 1 to 3, wherein, The first magnetic sensor and the second magnetic sensor are disposed on the same side with respect to an imaginary plane including the second axis.
  5. 5. The fastening tool according to claim 1 to 3, wherein, The distance between the magnet and the detection point of the first magnetic sensor when the magnet and the first magnetic sensor are located on a first straight line orthogonal to the second axis is equal to the distance between the magnet and the detection point of the second magnetic sensor when the magnet and the second magnetic sensor are located on a second straight line orthogonal to the second axis.
  6. 6. The fastening tool according to claim 1 to 3, wherein, The first magnetic sensor and the second magnetic sensor are mounted on a first substrate and a second substrate, respectively, which are separately provided.
  7. 7. The fastening tool according to claim 1 to 3, wherein, The first magnetic sensor and the second magnetic sensor are sensors having the same structure.
  8. 8. The fastening tool according to claim 1 to 3, wherein, The fastening tool can use, as the fastener, a break-off fastener in which the pin having a small diameter portion for breaking is inserted through the cylindrical portion, The pin gripping portion is configured to pull the pin rearward with respect to the cylindrical portion to fasten the work tool and to break the pin at the small diameter portion while moving from the initial position to the stop position.
  9. 9. A fastening tool configured to fasten a work using a fastener including a pin and a cylindrical portion, characterized in that, Comprising a motor, an anvil, a pin holding part, a magnet, a first magnetic sensor, a second magnetic sensor and a control device, wherein, The anvil is capable of abutting against the cylindrical portion; The pin gripping portion is configured to grip the pin and is configured to move relative to the anvil along a first axis by power of the motor, wherein the first axis defines a front-rear direction of the fastening tool; the magnets are arranged such that N-poles and S-poles are aligned in the front-rear direction, and are configured to move integrally with the pin grasping portion in the front-rear direction along a second axis parallel to the first axis; The first magnetic sensor defines a first detection direction; The second magnetic sensor defines a second detection direction, and is disposed at a position rearward of the first magnetic sensor; the control device is configured to move the pin grasping portion from an initial position to a stop position rearward relative to the anvil based on a detection result of the second magnetic sensor, and to move the pin grasping portion from the stop position to the initial position forward relative to the anvil based on a detection result of the first magnetic sensor, The first magnetic sensor and the second magnetic sensor are single-pole detection type sensors configured to detect the same predetermined magnetic pole of the magnet, The first and second magnetic sensors are configured such that an orientation of the first detection direction relative to the second axis is opposite an orientation of the second detection direction relative to the second axis.
  10. 10. The fastening tool according to claim 9, wherein, The prescribed magnetic pole is a magnetic pole arranged on the rear side of the N pole and the S pole, The first detection direction is a direction away from the second axis, The second detection direction is a direction toward the second axis.
  11. 11. The fastening tool according to claim 10, wherein, The prescribed magnetic pole is an N pole.
  12. 12. The fastening tool according to any one of claims 9 to 11, wherein, The first magnetic sensor and the second magnetic sensor are disposed on the same side with respect to an imaginary plane including the second axis.
  13. 13. The fastening tool according to any one of claims 9 to 11, wherein, The distance between the magnet and the detection point of the first magnetic sensor when the magnet and the first magnetic sensor are located on a first straight line orthogonal to the second axis is equal to the distance between the magnet and the detection point of the second magnetic sensor when the magnet and the second magnetic sensor are located on a second straight line orthogonal to the second axis.
  14. 14. The fastening tool according to any one of claims 9 to 11, wherein, The first magnetic sensor and the second magnetic sensor are mounted on a first substrate and a second substrate, respectively, which are separately provided.
  15. 15. The fastening tool according to any one of claims 9 to 11, wherein, The first magnetic sensor and the second magnetic sensor are sensors having the same structure.
  16. 16. The fastening tool according to any one of claims 9 to 11, wherein, The fastening tool can use, as the fastener, a break-off fastener in which the pin having a small diameter portion for breaking is inserted through the cylindrical portion, The pin gripping portion is configured to pull the pin rearward with respect to the cylindrical portion to fasten the work tool and to break the pin at the small diameter portion while moving from the initial position to the stop position.

Description

Fastening tool Technical Field The present invention relates to a fastening tool for fastening work elements using fasteners (fasteners). Background A fastening tool is known that fastens a plurality of work pieces using a fastener having a pin and a cylindrical portion. For example, in the fastening tool disclosed in patent document 1, a pin holding portion (jaw assembly) holds a pin and pulls the pin in an axial direction with respect to a cylindrical portion during a rearward movement from an initial position, thereby deforming a fastener and fastening a work. After reaching the predetermined stop position, the pin holding portion returns to the initial position. The movement of the pin grip portion is controlled based on the detection results of the detection by the 2 sensors. [ Prior Art literature ] [ Patent literature ] Patent document 1 Japanese patent laid-open publication No. 2019-892 Disclosure of Invention [ Problem to be solved by the invention ] In the fastening tool described in patent document 1, hall sensors are used as 2 sensors, which detect magnetic fields of magnets integrally moving with the pin grip portion, respectively. The detection accuracy of a position detection mechanism using a magnetic sensor such as a hall sensor is affected by the mounting manner of the magnetic sensor. In view of the above, an object of the present invention is to provide an improvement in a position detecting mechanism in a fastening tool for fastening a work using a fastener including a pin and a cylindrical portion. [ Solution for solving the problems ] According to one aspect of the present invention, there is provided a fastening tool configured to fasten a work using a fastener including a pin and a cylindrical portion. The fastening tool has a motor, an anvil, a pin grip, a magnet, a first magnetic sensor, a second magnetic sensor, and a control device. The anvil is configured to be capable of abutting against the cylindrical portion. The pin holding portion is configured to hold a pin of the fastener. The pin grip is configured to be moved relative to the anvil along a first axis by power of a motor. The first axis defines a front-to-back direction of the fastening tool. The magnets are arranged such that the N pole and the S pole are aligned in the front-rear direction. The magnet is configured to move in the front-rear direction along a second axis parallel to the first axis integrally with the pin grip portion. The first magnetic sensor has a first detection surface. The second magnetic sensor has a second detection surface. The second magnetic sensor is disposed at a position rearward of the first magnetic sensor. The control device is configured to move the pin gripping portion from the initial position to the stop position rearward relative to the anvil based on the detection result of the second magnetic sensor, and to move the pin gripping portion from the stop position to the initial position forward relative to the anvil based on the detection result of the first magnetic sensor. The first magnetic sensor and the second magnetic sensor are single-pole detection type sensors configured to detect the same predetermined magnetic pole of the magnet. In other words, the first magnetic sensor and the second magnetic sensor are configured to react only to the N pole of the magnet (detect only the magnetic field of the N pole), or to react only to the S pole of the magnet (detect only the magnetic field of the S pole). The first and second magnetic sensors are configured such that the first detection surface is oriented opposite the second detection surface with respect to the second axis. In the fastening tool according to the present aspect, when the magnet approaches the second magnetic sensor from the front, the magnetic poles of the magnets that approach the respective magnetic sensors are different from the magnetic poles of the magnets that approach the first magnetic sensor from the rear. In contrast, the orientation of the first detection surface of the first magnetic sensor with respect to the second axis (the movement axis of the magnet) is opposite to the orientation of the second detection surface of the second magnetic sensor with respect to the second axis. Therefore, one of the first magnetic sensor and the second magnetic sensor can function in the same manner as a single-pole detection type sensor for detecting a magnetic pole opposite to the original magnetic pole. Therefore, when the magnet approaches the second magnetic sensor from the front and when the magnet approaches the first magnetic sensor from the rear, the change in the magnetic field (magnetic flux density) of the magnetic pole detected by each magnetic sensor can be made the same. Accordingly, the dimension design of the fastening tool becomes easy, and the possibility of error occurrence can be reduced, so that the position detection accuracy of the pin grip portion is improved. According to another aspect of the