JP5448180B2 - Inner diameter adjusting device and method for adjusting inner diameter of wound core - Google Patents

Description

  The present invention relates to an inner diameter adjusting device and an inner diameter adjusting method for adjusting the inner diameter of a wound iron core made of a magnetic steel strip wound in an annular shape.

  Conventionally, as a method of manufacturing a wound core made of a magnetic steel strip wound in an annular shape, a method in which the magnetic steel strip is wound and then a heat resistant resin is applied to the wound core and cured is known. (For example, refer to Patent Document 1). In such a manufacturing method of a wound core, steel strips made of a magnetic material wound with a cured heat-resistant resin are bonded to each other, thereby preventing the number of turns of the wound core from being changed thereafter.

JP 2001-126941 A

  However, when a steel strip made of a magnetic material is wound, the number of windings of the wound core obtained by the mechanical properties such as elasticity in the steel strip varies. There is a problem that adjustment becomes difficult. In particular, in recent years, in order to improve the productivity of the wound iron core, a band-shaped metal magnetic material is pressed against a bending roller to impart a winding rod to the steel strip, and the steel strip is to be wound with the winding rod. A method to do this has also been developed. In a wound iron core made of a magnetic steel strip with windings in this way, the radius of curvature of the steel strip differs depending on the speed of pressing against the bending roller, etc., and the variation that occurs in the inner diameter of the obtained wound core is relatively large. It has been known. Therefore, in such a wound core, the inner and outer diameters of the wound core are determined when the applied heat-resistant resin is cured, but the wound core obtained by curing the heat-resistant resin is determined. Has a variation in its inner diameter and the like, and there is a problem that the inner diameter cannot meet relatively strict requirements.

  In order to eliminate this point, it is necessary to adjust the inner diameter of the wound core to a predetermined value before bonding the wound steel strips constituting the wound core to each other. There was no regulator. And as this adjustment, although it is conceivable to wind the wound core around a cylindrical core having a predetermined outer diameter, even if the wound core is wound around the wound core, the outer diameter of the core is reduced. On the other hand, if the inner diameter of the wound core is not increased, it is not possible to remove the wound core from the core, and it is difficult to stably obtain a wound core having a desired inner diameter due to variations in the inner diameter that occurs during the removal. there were.

  It is an object of the present invention to provide a wound core inner diameter adjusting device and an inner diameter adjusting method thereof that can adjust the inner diameter of the wound core relatively easily to a predetermined value.

  The inner diameter adjusting device of the wound core according to the present invention includes an inner peripheral support device having a plurality of support pieces capable of supporting an annular wound core in the inner periphery by widening the interval, and a winding by reducing the interval between each other. The outer periphery gripping device having a plurality of contact pieces that can contact the outer periphery of the iron core and the outer periphery gripping device in which the plurality of contact pieces abut on the outer periphery of the wound iron core are rotated forward or reverse about the central axis of the wound iron core. Gripping device rotation means.

  And it is preferable to provide an inner diameter sensor for measuring the inner diameter of the wound iron core and a controller for controlling the gripping device rotating means based on the detection output of the inner diameter sensor. In this case, the inner diameter of the wound iron core is a predetermined value. When the inner diameter sensor detects that the inner diameter of the wound iron core exceeds the predetermined value, the outer circumference gripping device is rotated forward, and when the inner diameter sensor detects that the inner diameter of the wound iron core is less than the predetermined value, the outer circumferential gripping device is reversed. When the inner diameter sensor detects that has reached a predetermined value, the rotation of the outer peripheral gripping device is preferably stopped.

  Further, the inner diameter adjustment method of the wound core in the present invention is provided around the wound iron core by supporting the wound iron core on the inner periphery by widening the interval between the plurality of support pieces inserted into the annular wound iron core. The contact pieces are brought into contact with the outer periphery of the wound iron core by reducing the interval between the contact pieces, and the plurality of contact pieces brought into contact with the outer circumference of the wound iron core are rotated forwardly around the center axis of the wound iron core. The inner diameter of the wound iron core is reduced or enlarged by being reversed.

  In the inner diameter adjusting device and inner diameter adjusting method of the wound iron core according to the present invention, when the inner diameter of the wound iron core exceeds a predetermined value that is a target value, a plurality of contact pieces that are in contact with the outer periphery of the wound iron core are rotated forward. When the inner diameter of the wound iron core is less than the target value, the outer periphery of the wound iron core is rotated with respect to the non-rotating inner circumference by reversing a plurality of contact pieces in contact with the outer circumference of the wound iron core. This can increase or decrease the number of turns of the wound core. And since the full length of the magnetic steel strip which comprises a wound iron core does not change, the internal diameter of a wound iron core will become small gradually when the number of turns increases, and the internal diameter of a wound iron core will become large gradually when the number of turns decreases. Therefore, when the inner diameter of the wound core reaches a predetermined value that is a target value, the wound core having a desired inner diameter can be obtained by stopping the rotation of the outer peripheral gripping device.

  Then, the inner diameter of the wound core is measured by the inner diameter sensor, and the controller controls the gripping device rotating means based on the detection output of the inner diameter sensor, and the inner diameter sensor detects that the inner diameter of the wound core exceeds a predetermined value. If the inner diameter sensor detects that the inner diameter of the wound iron core is less than a predetermined value, the outer periphery gripping device is reversed to determine that the inner diameter of the wound iron core has reached a predetermined value. If the rotation of the outer peripheral gripping device is stopped when the sensor detects, it is possible to automatically obtain a wound core having a desired inner diameter.

It is a front view which shows the internal diameter adjustment apparatus of the wound iron core in this invention embodiment. It is a side view which shows the internal diameter adjustment apparatus. It is a top view of the inner periphery support apparatus. It is a front view which shows the inner peripheral support apparatus. It is a side view which shows the outer periphery holding | grip apparatus. It is a bottom view of the outer periphery holding device. It is a figure which shows the state which the contact piece contact | abuts to the outer periphery of the wound iron core by which the inner periphery was supported by the support piece.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings.

  1 and 2 show an inner diameter adjusting device 10 of a wound core in the present invention. The inner diameter adjusting device 10 includes an inner peripheral support device 12 that supports an annular wound core 11 on the inner periphery, an outer peripheral gripping device 21 that has a plurality of contact pieces that can contact the outer periphery of the wound core 11, And gripping device rotating means 31 for rotating the outer periphery gripping device 21 forward or backward. The wound iron core 11 in this embodiment is an example used for a magnetic head, and is assumed to be wound with a permalloy steel strip that is a strip-shaped metal magnetic material (FIG. 7).

  As shown in FIGS. 3 and 4, the inner peripheral support device 12 includes a support main body 13 and a plurality of support pieces 14 provided on the upper surface of the support main body 13 so as to be radially movable. In this embodiment, the case where the three support pieces 14 are provided radially is illustrated, and the support main body 13 is fixedly provided on the base 10a (FIGS. 1 and 2). A horizontal table 13c is provided on the upper portion of the support main body 13, and three support rails 13a are provided radially from the central portion of the table 13c every 120 degrees on the upper surface of the table 13c. Supporting sliders 13b are movably provided on the three supporting rails 13a, and supporting pieces 14 are attached to the supporting sliders 13b, respectively.

  The three support pieces 14 can support the annular wound core 11 on the inner periphery by widening the interval between them, a placement portion 14a on which the wound core 11 is placed, and the placement portion 14a. Abutting portions 14b that abut against the inner peripheral surface of the wound core 11 when inserted into the inner diameter of the wound core 11 placed on the inner surface of the wound iron core 11 and widen the distance from each other are continuously formed on the placed portion 14a. The support main body 13 is configured such that the three support pieces 14 can be moved radially through the slider 13b by the supply of compressed air, and the three support pieces 14 can be moved radially by the broken lines in FIG. As shown by arrows, the intervals are increased, or the intervals are reduced as indicated by solid arrows in FIG.

  As shown in FIG. 2, a support member 16 is erected on the base 10 a adjacent to the inner peripheral support device 12, and an elevating air cylinder 17 is attached to the support member 16. The lifting air cylinder 17 has a main body portion 17b attached to the support member 16, and a movable slider 17a attached to the main body portion 17b so as to be movable up and down by supplying compressed air, and is attached to the movable slider 17a. Member 18 is attached. Then, the outer peripheral gripping device 21 is attached to the attachment member 18. In this way, the outer periphery gripping device 21 is mounted above the inner periphery support device 12 via the lifting air cylinder 17, and the lifting air cylinder 17 supports the outer periphery gripping device 21 by moving the movable slider 17a up and down. It is configured to be movable up and down above the device 12.

  As shown in FIGS. 5 and 6, the outer periphery gripping device 21 includes a columnar portion 22 attached to the mounting member 18 via a bearing 19, a gripping main body portion 23 provided at the lower end of the columnar portion 22, and its gripping A plurality of contact pieces 24 are provided on the lower surface of the main body 23 so as to be radially movable. In this embodiment, the case where three contact pieces 24 are provided radially is illustrated, and three grip rails 23a are provided radially from the central portion of the bottom surface of the grip main body 23 every 120 degrees ( In FIG. 6), gripping sliders 23b are movably provided on the gripping rails 23a. The contact pieces 24 are attached to the gripping sliders 23b.

  As shown in FIG. 5, when the lifting / lowering air cylinder 17 lowers the outer peripheral gripping device 21 together with the movable slider 17 a as indicated by the solid line arrow, the three contact pieces 24 in the outer peripheral gripping device 21 become the inner peripheral support device 12. It adjusts so that it may be located in the circumference | surroundings of the wound iron core 11 supported by. Then, although not shown, when the outer peripheral gripping device 21 is lifted together with the movable slider 17a as indicated by the broken line arrow, the three contact pieces 24 in the outer peripheral gripping device 21 are also lifted and supported by the inner peripheral support device 12. A work space is formed above the iron core 11 and between the wound iron core 11 and the outer periphery gripping device 21, and an operator supports the wound iron core 11 on the inner peripheral support device 12 through the work space, or The wound core 11 supported by the inner peripheral support device 12 is configured to be removable from the inner peripheral support device 12. Here, an adjustment screw for adjusting the ascending position of the movable slider 17a is denoted by reference numeral 17c in FIGS.

  As shown in FIGS. 5 and 6, the outer periphery gripping device 21 in this embodiment is a commercially available operation protrusion 22 a that moves three contact pieces 24 on the upper part of the cylindrical portion 22 of the outer periphery gripping device 21. Is used. The operation protrusion 22a is pressed from above to move the gripping slider 23b along with the gripping rail 23a together with the contact piece 24, and as shown by the solid line arrows in FIG. When the pressed operation projection 22a is pulled back, the distance between the three contact pieces 24 is increased together with the gripping slider 23b as shown by the broken line arrows in FIG. The outer peripheral gripping device 21 has a cylindrical portion 22 attached to the mounting member 18 via a bearing 19 so as to be rotatable about a central axis that is vertical, and the central axis that is the rotational center is an inner peripheral support device. It is attached so as to coincide with the central axis of the wound core 11 supported by 12.

  The contact piece 24 in this embodiment is configured by a resin roller that contacts the outer periphery of the wound iron core 11 and hardly slides on the outer periphery. The contact piece 24 made of this resin roller is attached to the gripping slider 23b. Mounted non-rotatably. Then, the outer peripheral gripping device 21 in the lowered state abuts the three contact pieces 24 on the outer periphery of the wound core 11 by reducing the interval between the three contact pieces 24 positioned around the wound core 11. Configuration is possible (FIG. 7). Further, as shown in FIGS. 1 and 2, an operation air cylinder 26 that presses or pulls back the operation protrusion 22 a in the outer periphery gripping device 21 is provided on the movable slider 17 a in the lifting air cylinder 17 together with the outer periphery gripping device 21. It is done.

  As shown in FIG. 1, the gripping device rotating means 31 rotates the outer periphery gripping device 21 forward or backward with the central axis of the wound core 11 as the center of rotation, and is provided on the cylindrical portion 22 of the outer periphery gripping device 21. A driven pulley 32, an electric motor 33 provided on the attachment member 18 that supports the cylindrical portion 22 via a bearing 19 so as to be adjacent to the outer peripheral gripping device 21, and a drive pulley 34 on a rotating shaft 33 a of the electric motor 33. And a belt 36 stretched between driven pulleys 32 provided on the cylindrical portion 22. When the electric motor 33 is driven and the rotation shaft 33a is rotated forward or backward, the drive pulley 34 is also rotated forward or backward. The rotation is transmitted to the driven pulley 32 via the belt 36, and the outer gripping device 21 is wound around the wound core. Eleven central axes are configured to rotate forward or reverse about the center of rotation.

  As shown in FIG. 7, the plurality of contact pieces 24 together with the outer peripheral gripping device 21 are rotated in the normal direction in a state where the plurality of contact pieces 24 abut on the outer periphery of the wound core 11 supported by the support piece 14 in the inner peripheral support device 12. Or, when reversed, the outer peripheral portion of the band-shaped metal magnetic steel strip that is wound and constitutes the wound core 11 is the inner peripheral portion of the wound core 11 that is supported by the plurality of support pieces 14 and does not rotate. It is configured to rotate forward or reverse together with the plurality of contact pieces 24 to increase or decrease the number of turns of the wound core 11. Since the inner peripheral support device 12 in this embodiment moves the plurality of support pieces 14 radially by air pressure, the number of turns of the wound iron core 11 increases and the inner diameter of the wound iron core 11 is reduced. The plurality of support pieces 14 are opposed to the air pressure as shown by solid arrows, and conversely, when the number of turns of the wound core 11 is reduced and the inner diameter of the wound core 11 is increased, the plurality of support pieces 14 are increased by the air pressure of the compressed air. The support pieces 14 are configured to increase the distance between each other as indicated by a broken line arrow.

  Returning to FIG. 1, the inner diameter adjusting device 10 of the wound core includes an inner diameter sensor 38 that measures the inner diameter of the wound core 11 and a controller 41 that controls the gripping device rotating means 31 based on the detection output of the inner diameter sensor 38. Here, as described above, when the inner diameter of the wound iron core 11 is reduced, the inner peripheral support device 12 in this embodiment reduces the interval between the plurality of support pieces 14 and conversely increases the inner diameter of the wound iron core 11. It is comprised so that the space | interval in the some support piece 14 may be expanded. Utilizing this, the inner diameter sensor 38 in this embodiment is composed of an encoder that converts the mutual spacing of the plurality of support pieces 14 into a predetermined signal, and this inner diameter sensor 38 is based on the mutual spacing of the plurality of support pieces 14. It is configured to measure the inner diameter of the wound core 11 and is provided on the support main body 13 in the inner peripheral support device 12.

  The detection output of the inner diameter sensor 38 is connected to the control input of the controller 41, and the control output of the controller 41 is a control valve 42 that supplies compressed air to the inner peripheral support device 12, The contact valve 43 is connected to an elevating valve 44 that supplies compressed air to the elevating air cylinder 17 that moves the outer periphery gripping device 21 up and down, and to the electric motor 33. Here, reference numeral 46 in FIG. 1 denotes a compressed air source 46 that supplies compressed air to the inner peripheral support device 12, the operation air cylinder 26, and the elevating air cylinder 17. The memory 41a of the controller 41 stores a predetermined value in the inner diameter of the wound core 11 as a target value. The controller 41 determines that the inner diameter sensor 38 indicates that the inner diameter of the wound core 11 exceeds the predetermined value. When detected, the outer periphery gripping device 21 is rotated forward, and when the inner diameter sensor 38 detects that the inner diameter of the wound core 11 is less than a predetermined value, the outer periphery gripping device 21 is reversed and the inner diameter of the wound core 11 is set to a predetermined value. When the inner diameter sensor 38 detects that the outer peripheral gripping device 21 has been reached, the rotation of the outer peripheral gripping device 21 is stopped.

  Next, a method for adjusting the inner diameter of the wound core in the present invention using the aforementioned inner diameter adjusting device for the wound core will be described.

  The inner diameter adjustment method of the wound core 11 includes an iron core supporting step of supporting the wound core 11 on the inner periphery by increasing the interval between the plurality of support pieces 14 inserted in the annular wound core 11, and the wound core 11. A contact piece contact step in which a plurality of contact pieces 24 provided around the contact piece 24 are contracted to contact each other on the outer periphery of the wound iron core 11 and a plurality of contacts in contact with the outer periphery of the wound iron core 11. A gripping device rotating step for reducing or expanding the inner diameter of the wound core 11 by rotating the piece 24 forward or backward about the central axis of the wound core 11 as a rotation center, and a plurality of supports of the wound core 11 having a desired inner diameter. And an iron core removing step of removing from the piece 14.

<Core support process>
In this step, the plurality of support pieces 14 inserted into the annular wound core 11 are spaced apart from each other to support the wound core 11 on the inner periphery. Here, the wound core 11 is made by winding a steel strip made of a magnetic material. In a state before the wound core 11 is supported, the wound core 11 is indicated by a broken-line arrow in FIG. The outer peripheral gripping device 21 is raised to form a work space above the inner peripheral support device 12, and the plurality of support pieces 14 in the inner peripheral support device 12 are kept close to each other as indicated by solid line arrows in FIG. Then, the wound iron core 11 is placed on the placement portions 14 a of the plurality of support pieces 14 through the work space above the inner peripheral support device 12. At this time, the contact portion 14 b formed continuously with the placement portion 14 a is inserted into the inner diameter of the wound core 11. Thereafter, the controller 41 operates the support valve 42 to supply or discharge the compressed air to or from the support main body 13 in the inner peripheral support device 12, and the plurality of support pieces 14 are moved radially as indicated by broken line arrows in FIG. Then, the mutual space is widened, and the contact portions 14b of these are brought into contact with the inner peripheral surface of the wound core 11 as shown in FIG. In this way, the wound core 11 is supported on the inner periphery.

<Contact piece contact process>
In this step, the plurality of contact pieces 24 provided around the wound iron core 11 are contracted with each other so that the contact pieces 24 are brought into contact with the outer periphery of the wound iron core 11. In order to bring the plurality of contact pieces 24 into contact with each other, the outer periphery gripping device 21 is lowered. This lowering is performed by operating the elevating valve 44 by the controller 41, supplying or discharging compressed air to the elevating air cylinder 17, and lowering the movable slider 17a as shown by the solid line arrow in FIG. Thereby, the plurality of contact pieces 24 in the outer periphery gripping device 21 are arranged around the wound core 11. Then, the controller 41 is operated to operate the contact valve 43, and the operating rod 22a of the operating air cylinder 26 is protruded to press the operating protrusion 22a in the outer periphery gripping device 21, and the solid line arrow in FIG. As shown, the intervals between the plurality of contact pieces 24 are reduced. Thereby, as shown in FIG. 7, the plurality of contact pieces 24 are brought into contact with the outer periphery of the annular wound core 11 supported by the inner peripheral support device 12.

<Gripping device rotation process>
In this step, the plurality of contact pieces 24 that are in contact with the outer periphery of the wound core 11 are rotated forward or backward with the central axis of the wound core 11 as the center of rotation, and the inner diameter of the wound core 11 reaches a predetermined value that becomes a target value. When it does, rotation of the several contact piece 24 centering on the central axis of the wound iron core 11 is stopped. This is performed by rotating or reversing the outer periphery gripping device 21 itself having a plurality of contact pieces 24, and whether to rotate normally or reversely is determined by the value of the inner diameter of the wound core 11. Specifically, when the inner diameter of the wound core 11 exceeds a predetermined value that is a target value, the outer periphery gripping device 21 is rotated forward, and when the inner diameter of the wound core 11 is less than a predetermined value that is a target value. The outer periphery gripping device 21 is reversed. This normal rotation or reverse rotation is performed by driving the electric motor 33 shown in FIG. 1, and the drive pulley 34 provided on the rotation shaft 33 a is rotated forward or reverse so that the driven pulley 32 is connected via the belt 36. The outer periphery gripping device 21 rotates forward or reversely with the central axis of the wound iron core 11 as the center of rotation.

  In FIG. 7, forward rotation is indicated by a solid line arrow, and reverse rotation is indicated by a broken line arrow. That is, the forward rotation indicated by the solid line arrow is the winding direction indicated by the one-dot chain line of the wound iron core 11, and the reverse rotation indicated by the broken line arrow is the direction opposite to the winding direction of the wound iron core 11, that is, the direction in which the winding is loosened. Indicates. Here, since the inner periphery of the wound iron core 11 supported by the support piece 14 in the inner periphery supporting device 12 does not rotate, the outer periphery of the wound iron core 11 with which the plurality of contact pieces 24 abut in the outer periphery gripping device 21 is When forward rotation or reverse rotation together with the plurality of contact pieces 24, the outer periphery rotates forward or reverse with respect to the inner periphery that does not rotate, and the number of turns of the wound core 11 increases or decreases. Since the total length of the magnetic steel strip constituting the wound core 11 does not change, when the number of turns increases, the inner diameter of the wound core 11 gradually decreases, and when the number of turns decreases, the inner diameter of the wound core 11 gradually increases. When the inner diameter of the wound core 11 is reduced, the plurality of support pieces 14 are reduced in distance as indicated by solid arrows, and when the inner diameter of the wound core 11 is increased, the plurality of support pieces 14 are indicated by broken line arrows. Increase the distance between each other. Therefore, in the present invention, the wound core 11 having a desired inner diameter can be obtained by stopping the rotation of the outer peripheral gripping device 21 when the inner diameter of the wound core 11 reaches a predetermined value that is a target value.

  Here, in this embodiment, the inner diameter sensor 38 that measures the inner diameter of the wound core 11 based on the interval between the plurality of support pieces 14, and the gripping device rotating means 31 are controlled based on the detection output of the inner diameter sensor 38. Since the controller 41 is provided, when the inner diameter sensor 38 detects that the inner diameter of the wound core 11 exceeds a predetermined value, the outer periphery gripping device 21 is rotated forward, and the inner diameter of the wound core 11 is less than the predetermined value. When the inner diameter sensor 38 detects that the outer periphery gripping device 21 is reversed, the outer periphery gripping device 21 is reversed, and when the inner diameter sensor 38 detects that the inner diameter of the wound core 11 has reached a predetermined value, the rotation of the outer periphery gripping device 21 is stopped. Thus, it is possible to automatically obtain the wound iron core 11 having a desired inner diameter.

<Iron core removal process>
In this step, the wound core 11 having a desired inner diameter is removed from the adjusting device 10. A specific procedure is to operate the contact valve 43 by the controller 41, immerse the retracting rod 26a of the operating air cylinder 26, pull back the operating protrusion 22a in the outer periphery gripping device 21, and use the broken line arrow in FIG. As shown, the intervals between the plurality of contact pieces 24 are increased. Thereby, the some contact piece 24 contact | abutted on the outer periphery of the wound iron core 11 is spaced apart from the outer periphery. Thereafter, the controller 41 operates the lifting / lowering valve 44 to raise the movable slider 17a in the lifting / lowering air cylinder 17, raise the outer peripheral gripping device 21 together with the movable slider 17a as shown by the broken arrow in FIG. A work space is formed above the support device 12. At the same time or thereafter, the controller 41 operates the support valve 42 to move the plurality of support pieces 14 in the inner peripheral support device 12 radially as indicated by solid arrows in FIG. The contact portion 14b that has been in contact with the inner peripheral surface is separated from the inner peripheral surface. Then, the wound core 11 is supported above the wound core 11 and supported by the inner peripheral support device 12 through a work space formed between the wound core 11 and the outer periphery gripping device 21. Remove from the circumferential support device 12. Since the wound core 11 removed in this way has a desired inner diameter, the steel strips made of a magnetic material wound by resin or welding are bonded or welded without changing the inner diameter. Then, annealing is performed after preventing the number of turns of the wound core 11 from changing thereafter.

  In the embodiment described above, the electric motor 33 is used as the gripping device rotating means 31 for rotating the outer periphery gripping device 21 forward or backward. However, the gripping device rotating means 31 rotates the outer periphery gripping device 21 forward or backward. As long as it can be reversed, a fluid pressure cylinder or a fluid pressure motor may be used instead of the electric motor 33.

  In the above-described embodiment, the contact piece 24 made of a resin roller that is non-rotatably attached to the gripping slider 23 b has been described. However, the contact piece 24 is in contact with the outer periphery of the wound core 11 and is aligned with the outer periphery of the wound core 11. As long as it is possible to roll or reverse, the contact piece 24 is not limited to a roller, but may have another shape.

DESCRIPTION OF SYMBOLS 10 Inner diameter adjustment apparatus of wound iron core 11 Rolled iron core 12 Inner periphery support apparatus 14 Support piece 21 Outer periphery holding apparatus 24 Contact piece 31 Grip apparatus rotation means 38 Inner diameter sensor 41 Controller

Claims (3)

An inner peripheral support device (12) having a plurality of support pieces (14) capable of supporting an annular wound iron core (11) in the inner periphery by expanding the interval between each other;
An outer periphery gripping device (21) having a plurality of contact pieces (24) capable of abutting on the outer periphery of the wound iron core (11) by reducing the interval between them;
Gripping device rotation in which the outer peripheral gripping device (21) in which the plurality of contact pieces (24) are in contact with the outer periphery of the wound iron core (11) is rotated forward or backward about the central axis of the wound iron core (11). An inner diameter adjustment device for a wound iron core comprising means (31). An inner diameter sensor (38) for measuring the inner diameter of the wound core (11), and a controller (41) for controlling the gripping device rotating means (31) based on the detection output of the inner diameter sensor (38),
The controller (41)
When the inner diameter sensor (38) detects that the inner diameter of the wound iron core (11) exceeds a predetermined value, the outer periphery gripping device (21) is rotated forward,
When the inner diameter sensor (38) detects that the inner diameter of the wound iron core (11) is less than a predetermined value, the outer periphery gripping device (21) is reversed,
The winding according to claim 1, wherein the outer periphery gripping device (21) is configured to stop rotating when the inner diameter sensor (38) detects that the inner diameter of the wound core (11) has reached a predetermined value. Iron core inner diameter adjustment device. Supporting the wound core (11) on the inner periphery by expanding the interval between the plurality of support pieces (14) inserted into the annular wound core (11),
The contact pieces (24) are brought into contact with the outer periphery of the wound core (11) by reducing the distance between the contact pieces (24) provided around the wound core (11),
Reducing the inner diameter of the wound core (11) by rotating the plurality of contact pieces (24) in contact with the outer periphery of the wound core (11) forward or reverse with the central axis of the wound core (11) as the center of rotation. A method of adjusting the inner diameter of the wound core to be expanded or expanded.

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