JP5669333B2 - Belt winding device and winding method - Google Patents

Description

   The present invention relates to an improvement in a winding device and a winding method for a strip that winds the strip around a core.

  For example, a toroidal coil used as an inductor for a power line filter or the like includes a ring-shaped toroidal core and a conductive wire wound around the toroidal core via an insulating material. Conventionally, as a toroidal core constituting this kind of toroidal coil, a winding core sandwiching the tip of a magnetic strip is rotated and the magnetic strip is wound dozens of times. The ring-shaped thing obtained by extracting is known. And as a winding method of this strip, the thing as shown in FIG. 9 is proposed (for example, refer patent document 1).

  Specifically, in this method of winding the strip, as shown in FIG. 9 (a), the winding core 2 is formed in a columnar shape having a locking recess 2a opened on its outer peripheral surface, and FIG. 9 (b). As shown in FIG. 9, the locking bar 3 is inserted into the locking recess 2 a from the rotational radial direction of the core 2, and the tip of the magnetic strip 4 is folded back to lock the locking recess 2 a, and FIG. As shown in c), the winding core 2 and the locking bar 3 are rotated synchronously with each other, and the magnetic strip 4 is wound around the winding core 2. As shown in FIG. 2, the locking rod 3 and the winding core 2 are removed from the winding portion 4 a of the magnetic strip 4 after moving in the radial direction of the winding core 2 to release the tip of the magnetic strip 4. And in this winding method of a strip, the front-end | tip part of the magnetic strip 4 released after extracting the core 2 is made to follow the internal peripheral surface of the magnetic strip 4 already wound by the elastic restoring force. Is curved. According to this method, the tip of the magnetic strip 4 is released with respect to the core 2 after the magnetic strip 4 is wound dozens of times, so that the core 2 can be smoothly extracted. .

JP 2004-149233 A

  However, in the conventional winding method of the strip, the locking recess 2a for inserting the locking rod 3 for locking the tip of the magnetic strip 4 from the rotational radial direction of the winding core 2 is formed on the cylindrical winding core 2. An opening is formed on the outer peripheral surface. For this reason, as shown in FIG. 9 (d), when the strip 4 is wound around the core 2, the strip 4 is wound linearly at the opening of the locking recess 2a, and the portion across the opening is Since the linear shape is formed, the inner diameter of the obtained toroidal core is smaller than the outer diameter of the core 2, which makes it difficult to manage the inner diameter. Further, when the magnetic strip 4 is wound dozens around the winding core 2, even after the winding core 2 is pulled out, the straight portion across the opening of the locking recess 2a remains as it is, and the obtained toroidal core is obtained. There was also a problem that the inner diameter of the circle did not draw a perfect circle.

  In order to solve this problem, it is conceivable to reduce the width d of the locking recess 2a as much as possible. However, if the width d of the locking recess 2a is reduced, the diameter of the locking rod 3 inserted into the locking recess 2a. The tip of the strip 4 folded back by the locking rod 3 is plastically deformed, and even if the locking rod 3 and the winding core 2 are removed from the winding portion 4a of the magnetic strip 4, the released magnetism is released. There was a problem that the end portion of the strip 4 did not follow the inner peripheral surface of the magnetic strip.

  An object of the present invention is to provide a strip winding device and a winding method capable of obtaining a toroidal core whose inner diameter is equal to the outer diameter of the core and close to a perfect circle.

The strip winding device according to the present invention includes a cylindrical core having a slit through which the strip can be inserted, a core rotation driving mechanism that rotationally drives the core with a first servomotor, A locking rod that is inserted over the entire length, is rotatable about the rotation center of the winding core with respect to the winding core, and is formed with a gap, and the locking rod is driven to rotate by a second servo motor. A locking rod rotation drive mechanism; and a controller for controlling the torque and rotation amount of the first servo motor and the second servo motor , wherein the gap is a part of the outer periphery of the locking rod and the inner peripheral surface of the winding core. The control by the controller is at least an operation of rotating the locking rod with respect to the winding core, and rotating both the winding core and the locking rod in the same direction at the same speed by synchronously rotating both. A predetermined rotation of both the winding core and the locking rod It includes an operation of stopping the rotation after winding a number of times, and an operation of rotating the locking rod in the direction opposite to the direction with respect to the stopped core .
In this case, the obtuse angle at which the slit is formed along the tangent line on the inner surface of the core so that the strip inserted through the slit is along the inner surface of the cylindrical core, and the outer surface of the core intersects the slit It is preferable that the part is rounded.

The strip winding method of the present invention uses the above-described strip winding device, the step of passing the slit through the gap and entering the leading end of the strip, and the locking to the core A step of rotating only the rod to bite the tip of the strip, a step of synchronously rotating the core and the locking rod in the same direction as the rotation, and winding the strip around the core; A step of stopping the rotation of the stopper rod and the winding core, a step of rotating only the locking rod with respect to the winding core in a direction opposite to the rotation to release the leading end of the strip, and a magnet wound around the winding core And a step of extracting the core from the strip.

In this method of winding the strip, the slit is formed along the tangent line on the inner surface of the core, and the strip inserted through the slit in the step of entering the tip of the strip is formed on the inner peripheral surface of the cylindrical core. In the process of biting the tip of the strip, the tip of the strip is bitten without plastic deformation, and the obtuse angle corner where the outer periphery of the core and the slit intersect is rounded. In the step of winding the strip around the winding core, the strip inserted through the slit is wound around the corner where the obtuse angle is rounded in the cross section intersecting the outer peripheral surface of the winding core. It is preferable to bend the tip of the strip separated from the slit in the step of drawing out in a circular arc shape along the inner peripheral surface of the strip that has been wound by elastic restoring force .

In the present invention, a slit is formed to insert the leading end of the magnetic strip from the rotational radius direction of the core. However, the width of this slit is sufficient if the strip can be inserted. There is no need to insert a stop rod. For this reason, the inner diameter of the obtained toroidal core can be made equal to the outer diameter of the core by significantly reducing the width of the slit. Also, if the slit is formed along the tangent line on the inner surface of the core, the strip inserted through the slit is along the inner peripheral surface of the cylindrical core, and is held by the locking rod in that state. The tip of the strip is not folded back and plastically deformed. In addition, if the obtuse angle corner in the cross section where the slit intersects the outer peripheral surface of the winding core is rounded, the band plate inserted through the slit is smoothly guided to the outer periphery. There is no plastic deformation of the plate . For this reason, when the winding core is pulled out from the wound magnetic strip together with the locking rod, the released magnetic strip can be reliably aligned with the inner peripheral surface of the wound magnetic strip. it can. Therefore, in the present invention, a toroidal core having an inner diameter equal to the outer diameter of the core and close to a perfect circle can be obtained.

It is a front view which shows the winding apparatus of the strip | belt board of this invention embodiment. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. FIG. 3 is a cross-sectional view corresponding to FIG. 2 showing a state in which the winding core is immersed. It is sectional drawing corresponding to FIG. 3 which shows the state which the core was immersed. It is process drawing which shows the winding method of the strip | belt board of this invention. It is a figure corresponding to the enlarged view of FIG. 1 which shows the shape of another latching bar of this invention. It is a figure corresponding to the enlarged view of FIG. 1 which shows the shape of another latching rod of this invention. It is process drawing which shows the conventional winding method.

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

  1 to 3 show a winding device 10 of the present invention. This strip winding device 10 includes a winding core 13 around which a leading end protrudes from a front surface of a main body 11 made of a rectangular body so as to be rotatable and a magnetic strip 12 is wound around the leading end. Examples of the magnetic strip 12 include a tape-like thin plate made of amorphous metal, a tape-like thin plate made of silicon steel, and the like. As shown in FIGS. 2 and 3, a bearing body 14 that is movable in the axial direction of the core 13 is provided on the back side of the main body 11. The winding core 13 includes a support cylinder portion 13a rotatably supported by the bearing body 14 via a bearing 16, and a tip cylinder portion 13b provided coaxially with the support cylinder portion 13a continuously to the support cylinder portion 13a. Prepare. On the other hand, a through-hole 11a is formed in the main body 11 coaxially with the winding core 13 so as to penetrate from the back side to the front side, and the distal end cylindrical portion 13b of the winding core 13 passes through the through-hole 11a and the leading end is the main body 11. It is comprised so that it may protrude ahead from the front. The diameter of the through hole 11a is slightly larger than the outer diameter of the tip tube portion 13b so that the difference from the outer diameter of the tip tube portion 13b is less than the thickness of the band plate 12.

Further, as shown in the enlarged view of FIG. 1, the distal end cylindrical portion 13 b protruding from the front surface of the main body 11 of the core 13 is formed in a cylindrical shape, and the strip 12 rotates from the outer periphery to the inner periphery at the distal end portion. A slit 13c that can pass from the outside in the radial direction is formed. The slit 13c is formed to extend in the axial direction from the end edge of the cylindrical core 13, and when viewed in a cross-sectional shape, the strip 12 inserted through the slit 13c is the inner peripheral surface of the cylindrical core 13. Is formed along a tangent line on the inner surface of the core 13 so as to extend along the line . The corner 13d on the obtuse angle side in the cross section where the slit 13c intersects the outer peripheral surface of the core 13 is rounded, and the strip 12 inserted through the slit 13c from the outer side in the rotational radial direction smoothly It is configured to be guided to the outer periphery.

  Further, the winding device 10 is provided with a core rotation driving mechanism 20 that rotationally drives the core 13. As shown in FIG. 3, the core rotation drive mechanism 20 in this embodiment includes a first servomotor 21 attached to the bearing body 14 in parallel with the core 13, and a rotation shaft 21 a of the first servomotor 21. Pulleys 22 and 23 are provided at the ends of the support cylinder portion 13a in the winding core 13, respectively. A belt 24 is wound around these pulleys 22, 23, and the rotation of the rotation shaft 21 a in the first servomotor 21 is transmitted to the winding core 13 via the belt 24, whereby the first servomotor 21 is transferred to the winding core 13. It is configured to be rotatable.

  Further, the winding device 10 includes a locking rod 26 inserted through the cylindrical winding core 13 and a locking rod rotation driving mechanism 27 that rotationally drives the locking rod 26. The locking rod 26 is formed in a columnar shape having an outer diameter slightly smaller than the inner diameter of the cylindrical winding core 13, and is inserted through the entire length of the winding core 13. It is configured to be rotatable around the center of rotation. As shown in the enlarged view of FIG. 1, a gap 26a is formed at the tip of the locking bar 26, into which the tip of the magnetic strip 12 that has passed through the slit 13c enters. This gap 26a is formed between the inner peripheral surface of the core 13 by cutting out a part of the outer periphery of the end of the locking rod 26 on the extension line of the slit 13c in parallel with the slit 13c.

As shown in FIGS. 2 and 3, the locking rod rotation drive mechanism 27 in this embodiment includes a second servo motor 28 provided coaxially with the locking rod 26 on the proximal end side of the locking rod 26. In addition, the second servo motor 28 is fixed to the bearing body 14 via an angle member 29. The rotary shaft 28a of the second servo motor 28 is connected to the base end of the locking rod 26 via a coupling 31, and the rotation of the rotary shaft 28a is directly transmitted to the locking rod 26. The locking rod rotation drive mechanism 27 including the second servomotor 28 rotates the locking rod 26 with respect to the winding core 13 in a stopped state, and moves the gap 26a with respect to the slit 13c at the tip thereof. The tip of the magnetic strip 12 is sandwiched and held, and the tip of the magnetic strip 12 is rotated by rotating the locking rod 26 from the state of gripping the strip 12 so that the gap 26a faces the slit 13c. Configured to release parts.

  As shown in FIG. 2, the winding device 10 is provided with a bearing body moving mechanism 36 that moves the bearing body 14 in the axial direction of the core 13 with respect to the main body 11. The bearing body moving mechanism 36 is a pair of cylinders 37, 37 provided on both sides of the core 13 so as to sandwich the core 13 between the main body 11 and extending in the axial direction of the core 13. The bearing body 14 is fixed to the tips of the projecting shafts 37a and 37a. Then, the tip of the core 13 protrudes from the front surface of the main body 11 in the state shown in FIG. 2 in which the protruding and retracting shafts 37a and 37a of the cylinder 37 are immersed, and from this state, the protruding and retracting shaft 37a, When the member 37a is protruded, the bearing body 14 moves in the axial direction of the core 13 with respect to the main body 11, and the core 13 also moves together with the bearing body 14 so that the tip thereof is immersed in the main body 11 from the front surface of the main body 11. Configured as follows. 1, 2, and 4, reference numeral 38 indicates that the bearing body 14 comes into contact with the bent portion 38 a at the distal end of the winding core 13 while the distal end of the core 13 is immersed in the main body 11, thereby moving the bearing body 14. A limiting member 38 for limiting the range is shown.

  The winding device 10 includes a controller (not shown). The controller includes a first servo motor 21 that constitutes the core rotation driving mechanism 20, a second servo motor 28 that constitutes the locking rod rotation driving mechanism 27, and a bearing body. The cylinders 37 and 37 constituting the moving mechanism are controlled based on a preset program. Although not shown, the winding device 10 is fixed by welding a supply mechanism for supplying the magnetic strip 12, a cutter for cutting the magnetic strip 12, and a terminal portion of the cut magnetic strip 12. A welding machine is provided.

The first servo motor 21 and the second servo motor 28 described above are known “electric motors used to convert an electrical control signal of a servo mechanism into torque and to apply rotation or displacement to a load.” Second edition revised edition "Iwanami Shoten, issued October 15, 1982).

  In particular, the servomechanism is “a feedback system class that focuses on the control amount, and is a generic name for control systems that use the position or angle as the control amount. Further, in some cases, the speed is an amount related to the position and angle. The servo mechanism may include a control system that controls angular velocity, acceleration, force, etc. ”(“ Mechanical Engineering Handbook, 4th edition ”, The Japan Society of Mechanical Engineers, May 31, 1990). Is.

  Normally, the electrical control signal of the servo mechanism in the servo motor consists of three parts: position control, speed control, and current control. In order to perform more precise control, the servo mechanism makes rapid acceleration / deceleration / stop / It is set by the program so that the reverse rotation can be dealt with quickly.

  In the present invention, “the end of the magnetic strip 12 is rotated by rotating the locking rod 26 (only) with respect to the core 13 in a stopped state and moving the gap 26 a with respect to the slit 13 c at the tip. In order to release the tip of the magnetic strip 12 by rotating the locking rod 26 (only) from the state of gripping the strip 12 and making the gap 26a face the slit 13c. As described in the above description, the rotation angle and stop position of the locking rod 26, and the maintenance of the relative position during the synchronous rotation of the locking rod 26 and the winding core 13, or In the case where the locking rod 26 and the core 13 are simultaneously stopped in synchronization, it is necessary to control the accurate position of the rotational speed and rotational angle with high accuracy.

  Therefore, also in the object of the present invention to manage the inner diameter of the toroidal core and to obtain a perfect circle, a servo motor is used as a drive means of the core rotation drive mechanism 20 and the locking rod rotation drive mechanism 27 constituting the present invention. It is desirable to use

  Further, “control based on a preset program” means (a) an operation of rotating the locking rod 26 with respect to the winding core 13 in a stopped state, as will be described later on the winding method of the strip. (B) an operation of synchronously rotating both of the locking rods 26 with respect to the winding core 13 and rotating them in the same direction at a constant speed, and (c) an operation of simultaneously stopping both the winding core 13 and the locking rods 26 simultaneously. (D) the rotational speed of the first servo motor 21 and the second servo motor 28 in the operation of rotating the locking rod 26 in the direction opposite to the aforementioned direction with respect to the core 13 in the stopped state, the acceleration at the time of acceleration / deceleration, and Necessary conditions such as the number of rotations, the rotation time, and the position of the rotation angle are preset as a program.

   Next, a method for winding the strip in the present invention in which the magnetic strip is wound using the winding device will be described.

As shown in FIG. 6A, the tip of the magnetic strip 12 supplied from a supply mechanism (not shown) is inserted into the slit 13c formed at the tip of the core 13 from the outside in the rotational radial direction, and the slit 13c. The leading end portion of the strip 12 that has passed through the slit 13c is caused to enter the gap 26a of the locking rod 26 that communicates with. Thereafter, as shown in FIG. 6 (b), the locking rod rotation drive mechanism 27 (FIGS. 2 and 3) rotates the locking rod 26 with respect to the winding core 13 in the stopped state, so that there is a gap between the slit 13c. 26a is moved so that the leading end of the magnetic strip 12 is sandwiched and held between the slit 13c and the gap 26a, and the leading end of the magnetic strip 12 is inserted into the slit 13c to the core 13 Lock.

Next, as shown in FIG. 6C, the core 13 is rotated together with the locking rod 26 to wind the magnetic strip 12 around the core 13. In this embodiment, both the first servo motor 21 constituting the core rotation driving mechanism 20 and the second servo motor 28 constituting the locking rod rotation driving mechanism 27 are synchronously rotated, so that the core 13 and the locking rod are rotated. 26 is rotated at the same speed in the same direction (FIGS. 2 and 3). The rotation direction at this time is rounded on the obtuse angle side in the cross section where the strip 12 inserted through the slit 13c formed along the tangent on the inner surface of the core 13 intersects the outer peripheral surface of the core 13. It is set as the direction hung around the corner 13d. As a result, the strip 12 inserted through the slit 13 c is smoothly guided to the outer periphery of the core 13, and the magnetic strip 12 can be quickly wound around the core 13. Then, by rotating the winding core 13 and the locking rod 26 synchronously, the winding core 13 is rotated while maintaining the state where the tip of the magnetic strip 12 is held by the inner peripheral surface of the winding core 13 and the gap 26a. After the magnetic strip 12 is wound around the core 13 a predetermined number of times, their rotations are synchronized and stopped simultaneously . When the magnetic strip 12 has been wound around the core 13, the magnetic strip 12 is cut by a cutter (not shown), and the terminal portion of the cut magnetic strip 12 is welded to the winding portion of the magnetic strip 12 by the welding machine 40. Fix by welding.

Next, as shown in FIG. 6 (d), the locking rod 26 is rotated in the direction opposite to the direction in which the strip plate 12 is held with respect to the core 13 in the stopped state, so that the gap 26a faces the slit 13c. This releases the tip of the magnetic strip 12. Subsequently, as shown in FIG. 6 (e), the core 13 is extracted from the magnetic strip 12 wound together with the locking rod 26. As shown in FIGS. 4 and 5, this extraction is performed by moving the bearing body 14 with respect to the main body 11 in the axial direction of the core 13 by the bearing body moving mechanism 36. Specifically, projecting shafts 37a and 37a in a pair of cylinders 37 and 37 provided on both sides of the core 13 so as to extend in the axial direction of the core 13 are protruded, and a bent portion 38a (see FIG. 4), the bearing body 14 is moved with respect to the main body 11 until the bearing body 14 comes into contact therewith, whereby the tip of the winding core 13 is inserted into the main body 11 from the front surface of the main body 11.

  Here, the difference between the diameter of the through-hole 11a formed in the main body 11 and through which the distal end cylindrical portion 13b of the winding core 13 passes and the outer diameter of the distal end cylindrical portion 13b is less than the thickness of the band plate 12. Therefore, when the front end of the winding core 13 is immersed in the main body 11 from the front surface of the main body 11, a part or all of the strip 12 wound around the front end cylindrical portion 13b is formed between the through hole 11a and the front end cylindrical portion 13b. It does not get into the gap between them. For this reason, when the front end of the core 13 is immersed in the inside of the main body 11, the side surface of the strip 12 wound around the front end cylindrical portion 13 b of the core 13 comes into contact with the front surface of the main body 11 and the front end of the core 13. The core 13 is removed from the wound strip 12 when the core 13 is moved to the side and the immersion of the core 13 is completed.

  When the winding core 13 is removed, the leading end of the strip 12 inserted through the slit 13c and entering the gap 26a is also moved along with the movement of the wound strip 12 toward the leading end of the winding core 13. 13 and the front end side of the locking rod 26, and when the core 13 is extracted, the core 13 is detached from the slit 13c and the gap 26a. Then, when the winding core 13 is extracted from the magnetic strip 12 wound together with the locking rod 26, the tip of the magnetic strip 12 detached from the slit 13c and the gap 26a as shown by the arrow in FIG. 6 (e). Is curved in an arc shape along the inner peripheral surface of the magnetic strip 12 already wound by the elastic restoring force. Thereby, the toroidal core 18 which consists of the wound magnetic strip 12 can be obtained.

After the magnetic strip 12 is wound around the core 13 as described above, the locking rod 26 is rotated in the direction opposite to the direction wound around the core 13 in the stopped state, so that the core 13 is rotated. Thus, the tip of the magnetic strip 12 is released, so that the locking rod 26 and the winding core 13 can be smoothly extracted from the toroidal core 18 formed of the wound magnetic strip 12. Therefore, the quality and yield of the obtained toroidal core 18 can be improved.

  Further, in the present invention, the slit 13c for inserting the tip end portion of the magnetic strip 12 from the rotational radial direction of the core 13 is formed. However, the width D (FIG. 1) of the slit 13c can be inserted through the strip 12. Since it is sufficient, there is no need to insert the locking rod as in the prior art. For this reason, the width D of the slit can be made significantly narrower than the width d of the conventional locking recess 2a shown in FIG. Therefore, as shown in FIG. 6C, even when the strip 12 is wound around the core 13, the strip 12 is linearly wound around the outer periphery of the core 13 where the slit 13c is opened. Absent. As a result, the inner diameter of the obtained toroidal core 18 can be made equal to the outer diameter of the core 13.

Further, since the slit 13c is formed along the tangent line on the inner surface of the core 13, the strip 12 inserted through the slit 13c is along the inner peripheral surface of the cylindrical core 13, and in this state, the locking rod 26, the leading end of the strip 12 is not folded back and plastically deformed. Further, the obtuse angle side corner 13d in the cross section where the slit 13c intersects the outer peripheral surface of the core 13 is rounded, and the strip 12 inserted through the slit 13c from the outer side in the rotational radial direction smoothly guides to the outer periphery. Thus, the strip 12 does not plastically deform at the corner portion 13d . For this reason, when the winding core 13 is extracted from the wound magnetic strip 12 together with the locking rod 26, the released end portion of the magnetic strip 12 is securely attached to the inner peripheral surface of the wound magnetic strip 12. Can be along. Therefore, in the present invention, the toroidal core 18 whose inner diameter is equal to the outer diameter of the core 13 and close to a perfect circle can be obtained.

In the above embodiment, since the second servomotor 28 is used as the locking rod rotation drive mechanism 27 that rotates the locking rod 26 with respect to the core 13, the torque and the rotation amount for rotating the locking rod 26 are set. Can be controlled. For this reason, it is possible to adjust the force with which the gap 26 a holds the leading end of the magnetic strip 12 together with the slit 13 c depending on the type of the strip 12 wound around the winding core 13. On the other hand, even if the second servo motor 28 is used as the locking rod rotation drive mechanism 27, the first servo motor 21 in the winding core rotation drive mechanism 20 rotates the winding core 13 and the locking rod 26 synchronously with each other. There is no problem in maintaining the state in which the tip of the magnetic strip 12 is held when the core 13 is rotated.
However, the locking rod rotation drive mechanism 27 is not limited to including the second servomotor 28, and the servomotor can be used to rotate the locking rod 26 with respect to the core 13 without using the servomotor. another mechanism having a similar performance may be used.

  In the above-described embodiment, a gap formed between the inner peripheral surface of the core 13 by cutting out a part of the outer periphery of the distal end of the locking rod 26 on the extension line of the slit 13c in parallel with the slit 13c. 26a has been described, but is not limited to this shape, and the gap 26a is formed between the inner peripheral surface of the core 13 by cutting or notching a part of the outer periphery of the end of the locking rod 26, for example. It is formed and includes all shapes that can grip the tip of the magnetic strip 12 by moving with respect to the slit 13c. For example, as shown in FIG. 7, the parallel portion 26 b parallel to the slit 13 c and the slit 13 c are inclined so that the cross-section has a square shape, and the gap between the slit 13 c is widened toward the slit 13 c. 8, and a part or all of the outer periphery of the distal end of the locking rod 26 is cut so that the distal end shape is centered from the central axis of the locking rod as shown in FIG. 8. A biased perfect circle or ellipse may be used, and the outer peripheral surface thereof may be a gap 26 a generated between the inner peripheral surface of the core 13.

  If the gap 26a is as shown in FIGS. 7 and 8, as shown in FIGS. 7A and 8A, the magnetic strip 12 can be easily inserted into the gap 26a by the inclined portion 26c or the curved surface. As shown in FIGS. 7B and 8B, when the locking rod 26 is rotated, the inclined portion 26c or the curved surface comes into surface contact with the band plate 12 and the tip thereof together with the slit 13c. Therefore, it can be expected that the front end portion of the band plate 12 is prevented from being damaged due to the pinching.

DESCRIPTION OF SYMBOLS 10 Winding device 12 Magnetic strip 13 Winding core 13c Slit 13d Obtuse angle side corner 20 Winding core rotation drive mechanism 26 Locking rod 26a Clearance 27 Locking rod rotation driving mechanism

Claims (4)

A cylindrical core (13) having a slit (13c) through which the strip (12) can be inserted;
A core rotation drive mechanism (20) for rotating the core (13) with a first servo motor (21);
A locking rod (26) inserted through the entire length of the core (13), rotatable about the rotation center of the core with respect to the core, and having a gap (26a) formed therein,
A locking rod rotation drive mechanism (27) for rotating the locking rod (26) with a second servo motor (28) ;
A controller for controlling torque and rotation amount of the first servo motor (21) and the second servo motor (28) ;
The gap (26a) is formed between a part of the outer periphery of the locking rod (26) and the inner peripheral surface of the core (13),
Control by the controller is at least
(A) an operation of rotating the locking rod (26) with respect to the core (13);
(B) an operation of rotating both the core (13) and the locking rod (26) in the same direction at the same speed by synchronously rotating;
(C) an operation of stopping both the winding core (13) and the locking rod (26) after winding them by a predetermined number of revolutions;
(D) an operation of rotating the locking rod (26) in the direction opposite to the direction with respect to the stopped core (13) ;   The slit (13c) is formed along the tangent line on the inner surface of the core (13) so that the strip (12) inserted through the slit (13c) is along the inner peripheral surface of the cylindrical core (13). The winding device for a strip according to claim 1, wherein the obtuse angle corner (13d) where the outer peripheral surface of the winding core (13) and the slit (13c) intersect is rounded. A method of winding a strip using the strip winding device according to claim 1,
A step of advancing the distal end portion of the strip through said slit (13c) wherein the gap (26a),
A step of rotating only the locking rod (26) with respect to the winding core (13) to hold the tip of the strip (12);
Winding the winding strip (12) around the winding core (13) by synchronously rotating the winding core (13) and the locking rod (26) in the same direction as the rotation;
Stopping the rotation of the locking rod (26) and the core (13);
A step of releasing only the locking rod (26) with respect to the winding core (13) in a direction opposite to the rotation to release the tip of the strip (12);
And a step of extracting the winding core (13) from the magnetic strip (12) wound around the winding core (13). A slit (13c) is formed along the tangent line on the inner surface of the core (13),
In the step of entering the front end of the strip, the strip (12) inserted through the slit (13c) along the inner peripheral surface of the cylindrical winding core (13),
In the step of biting the tip of the strip (12), the tip of the strip (12) is bitten without plastic deformation,
Round the obtuse angle side corner (13d) where the outer peripheral surface of the core (13) and the slit (13c) intersect,
In the step of winding the strip (12) around the core (13), the cross section of the strip (12) inserted through the slit (13c) intersects the outer peripheral surface of the core (13). Hung around the rounded corner (13d) at
The tip of the strip (12) detached from the slit (13c) in the step of removing the core (13) is along the inner peripheral surface of the strip (12) wound by elastic restoring force. The method for winding a strip according to claim 3, wherein the winding is performed in an arc shape.

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