JP3013386U - Bobbin cap for feeding wire - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a wire rod feeding bobbin cap capable of preventing the wire rod from breaking due to an increase in tension at the time of feeding the wire rod. [Structure] A bobbin cap 5 is fitted from above to a collar 3 of a bobbin 1 with a collar, which comprises a wire winding body 2 and flanges 3 formed at both ends of the wire winding body 2. The joint section 6 is provided. The fitting portion 6 has a lower end side protruding portion 8 having a substantially semicircular cross section that protrudes downward from the lower surface of the collar portion 3.
The outer peripheral surface of the bobbin cap 5 also has an annular outer peripheral side protruding portion 9 protruding laterally. [Effect] When the wire rod 4 is unwound from the collared bobbin 1, since the wire rods 4 rub against each other for a short length, the increase in tension due to static electricity is small and wire breakage is unlikely to occur.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bobbin cap for stabilizing the pay-out property when paying out a winding material from a bobbin for paying out a wire rod with a collar.

[0002]

[Prior art]

 In recent years, magnet wires, which are wires used for coil windings, have been widely used even in ultra-fine magnet wires with a diameter of 10 μm, following the trend of lighter, thinner and smaller wires. On the other hand, the winding speed is steadily increasing to 10,000 to 50,000 rpm, and the traveling speed of the magnet wire is also increasing to 100 to 400 m / min. The magnet wire before winding is generally wound around a synthetic resin bobbin.However, in order to counter the above-mentioned speeding up of running, the wire breakage when the magnet wire is unwound from the bobbin during winding processing is performed. In order to prevent this and stabilize the winding shape, it has been used in the past to apply a small amount of lubricant, etc. to the surface of the wire, or to impart self-lubricity to the outer coating of the wire.

An example of a bobbin for feeding out a wire rod such as a magnet wire is shown in FIGS. 8 and 9. The bobbin 21 is made of synthetic resin, and has a cylindrical wire rod winding body 22 and the wire rod winding body portion. A wire rod 24 is wound around this wire rod winding body portion 22. Then, at the time of winding processing, the wire 24 is unwound from the bobbin 21 and wound around a coil or the like.

[0004]

[Problems to be solved by the device]

 When the wire rod 24 is unwound as described above, the wire rod 24 rubs against the lower end surface and the outer peripheral surface of the disk-shaped collar portion 23 and runs. By the way, the wire 24 such as a magnet wire is easily charged with static electricity. In addition, the bobbin 21 made of synthetic resin is originally easily charged and difficult to be discharged. Therefore, the longer the length of the wire 24 and the outer peripheral surface of the lower end surface and the outer peripheral surface of the collar portion 23 of the bobbin 21, the longer the length of the charged electric charge. Then, such static electricity causes clinging between the wire rod 24 and the collar portion 23 of the bobbin 21 that are fed out, and resistance (tension) to the feeding is generated. This tension becomes maximum at the upper end S of the wire winding body 22 where the contact length is the longest in relation to the unwinding angle. When this tension exceeds a predetermined value, there is a problem that wire breakage occurs and the yield is remarkably reduced. Further, when a surface defect such as a scratch is generated on the collar portion 23 of the bobbin 21, the wire rod 24 bites into the surface defect and the wire is easily broken. Therefore, the flange 23 of the bobbin 21 is ground to remove the surface defect, but this operation is complicated and causes a decrease in efficiency. In addition, a bobbin cap is attached in order to cover minute scratches generated on the collar portion 23 of the bobbin 21. However, although this bobbin cap can cover surface defects such as scratches on the collar 23 of the bobbin 21, this time, static electricity is generated due to friction between the bobbin cap and the wire material, which also causes a problem of disconnection. There is. Nylon filaments and fryer are also added to the collar of the bobbin, but they have a problem that the maintenance is difficult and the productivity is lowered.

As a bobbin capable of solving such a problem, Japanese Utility Model Laid-Open No. 59-18755 discloses a bobbin having a cylindrical body and a brim at both ends of the body. At the same time, one of the flange portions has a tapered surface portion having an angle of 8 to 30 degrees with respect to a plane orthogonal to the axis of the bobbin, and a flat portion extending on the outer periphery of the tapered surface portion and perpendicular to the axis. There is disclosed a wire rod bobbin having a surface portion.

In the bobbin described in Japanese Utility Model Laid-Open No. 59-18755, since the flat surface portion of the collar portion is larger than the taper surface portion, a protruding portion is formed on the outer peripheral portion thereof, and the bobbin is Although it is possible to reduce the contact length with the wire to some extent, the friction between the lower end surface of the collar and the wire when the wire is unwound from the upper end of the winding body is not sufficiently eliminated. However, there is a problem in that static electricity is apt to be generated and the wire material is attracted to the collar portion so as to come into contact with the brim portion due to the static electricity. In addition, if the collar of the bobbin is damaged, the wire will bite into it and the wire will be easily broken. At this time, the ribs of the bobbin are ground to remove surface defects, but the work is complicated and the efficiency is reduced.

The present invention is intended to solve such a problem, and an object of the present invention is to provide a wire rod feeding bobbin cap capable of preventing the wire rod from breaking due to an increase in tension at the time of feeding the wire rod. .

[0008]

[Means for Solving the Problems]

 A bobbin cap for feeding a wire according to claim 1 of the present invention is a cap for covering a collar portion of a collared bobbin including a wire winding body and flanges formed at both ends of the wire body winding body. There is provided a fitting portion which is fitted to the flange portion from above, and the fitting portion has a lower end side protruding portion which projects downward from the lower surface of the collar portion.

Further, in the wire rod feeding bobbin cap according to a second aspect of the present invention, a laterally protruding portion is formed on the outer periphery of the cap.

In the wire rod feeding bobbin cap of the third aspect, the projecting portion on the lower end side and the projecting portion in the lateral direction have a substantially semicircular cross section.

In the wire rod feeding bobbin cap of claim 4, a line connecting the lower end of the protruding portion on the lower end side and the upper end of the wire rod winding body of the bobbin to a plane orthogonal to the axis of the bobbin. Has an angle of 3 to 30 °.

Further, in the wire rod feeding bobbin cap of claim 5, the bobbin cap is made of a fluorine resin, a Delrin resin, a nylon resin, or a metal whose surface is subjected to a lubrication treatment. Is a fluorine-based resin, Delrin-based resin, nylon resin, or metal whose surface has been lubricated.

[0013]

According to the structure of claim 1, when the wire rod is unwound from the wire rod winding body portion of the collared bobbin, the wire rod protrudes below the lower surface of the collar portion at the fitting portion of the bobbin cap. Since the length of rubbing is short due to running in a non-contact state with the protruding portion formed by contacting the protruding portion formed, the increase in tension due to static electricity is less likely to cause disconnection. Furthermore, since the bobbin travels and is paid out without contacting the collar of the bobbin, even if the bobbin is damaged, the wire will not cut into it and the wire will not be broken. If the bobbin cap is damaged, the bobbin cap may be removed from the collar of the bobbin and ground, or the bobbin cap may be replaced.

According to the second aspect of the invention, since the lateral protrusion is formed on the outer periphery of the cap, the contact length between the bobbin cap and the wire can be minimized. It is possible to stabilize the feeding tension of the wire rod.

According to the configuration of claim 3, since the projecting portion on the lower end side and the projecting portion in the lateral direction have a substantially semicircular cross section, the wire rod makes a point contact with the projecting portions on the lower end side and the outer peripheral side. Therefore, the feeding tension of the wire can be extremely stabilized.

According to the configuration of claim 4, a line connecting the lower end of the protruding portion on the lower end side and the upper end of the wire rod winding body of the bobbin is 3 to a plane orthogonal to the axis of the bobbin. With an angle of 30 °, the wire does not come into contact with the lower end surface of the bobbin when the wire is unwound from the upper end of the bobbin winding body, and is guided to the lower end projection. Since there is little bending of the wire between the two, breakage is unlikely to occur.

Further, according to the structure of claim 5, since the bobbin cap is made of a fluorine resin, a delrin resin, a nylon resin, or a metal whose surface has been subjected to a lubrication treatment, when the wire rod is fed out. Has good slipperiness.

[0018]

【Example】

 Hereinafter, a wire rod feeding bobbin cap according to a first embodiment of the present invention will be described in detail with reference to the accompanying drawings. 1 to 3, the bobbin 1 is made of a synthetic resin, and has a cylindrical wire winding body 2 and a disk-shaped collar 3 formed to have a diameter larger than that of the wire winding body 2 above and below. And a wire 4 is wound around the wire winding body 2. Reference numeral 5 denotes a bobbin cap, which is made of a fluororesin having a good sliding property when the wire rod 4 is paid out, and has an annular fitting portion 6 which can be fitted into the collar portion 3 of the bobbin 1. And the canopy portion 7 formed on the upper surface of the fitting portion 6 described above, and is fitted into the upper flange portion 3 from above. Further, the lower end surface of the fitting portion 6 of the bobbin cap 5 has a ring-shaped lower end side protruding portion 8 having a semicircular cross section and continuously protruding from the fitting portion 6 below the lower surface of the collar portion 3 of the bobbin 1. Is formed in. The protruding length of the lower end side protruding portion 8 is a plane orthogonal to the straight line L connecting the lower end of the lower end side protruding portion 8 and the upper end portion S of the wire rod winding body portion 2 of the bobbin 1 and the axis of the bobbin 1. It is preferable that the angle θ with M be in the range of 3 ° to 30 °. When the angle θ is less than 3 °, the wire 4 easily comes into contact with the lower surface of the collar 3 when the wire 4 is unwound from the upper end S of the wire winding body 2. Is greatly bent at the upper end S of the wire winding body 2 and is paid out, which increases the payout resistance, which is not preferable. Further, in this embodiment, one outer peripheral protruding portion 9 having a semicircular cross-section is formed annularly on the outer peripheral surface of the bobbin cap 5 so as to project laterally. Although the bobbin cap 5 is made of a fluororesin in this embodiment, it may be made of a material having a good slidability with respect to the wire 4, for example, a Delrin resin or a nylon resin. You can have it. Further, the material is not limited to the synthetic resin and may be a metal whose surface is subjected to a lubrication treatment.

The operation of the above configuration will be described. During the winding process, the wire 4 is unwound from the bobbin 1 and wound around a coil or the like. At this time, the wire rod 4 contacts only the lower end side protruding portion 8 and the outer peripheral side protruding portion 9, so that the length of rubbing during traveling is shortened, and thus the tension due to static electricity is reduced and the wire breakage is less likely to occur.

As described in detail above, the wire rod feeding bobbin cap 5 of the first embodiment includes the wire rod winding body portion 2 and the flange portions 3 formed at both ends of the wire rod winding body portion 2. A lower end that covers the collar portion 3 of the collared bobbin 1 and that includes a fitting portion 6 that fits into the collar portion 3 from above, and that the fitting portion 6 projects downward from the lower surface of the collar portion 3. Since the wire rod 4 has side protrusions 8, when the wire rod 4 is unwound from the wire rod winding body portion 2 of the bobbin 1 with a collar, the wire rod 4 is protruded at the lower end side formed in the fitting portion 6 of the bobbin cap 5. Since it travels in a non-contact state with the lower surface of the collar portion 3 while contacting the portion 8, the length of rubbing during traveling is short, which increases the tension caused by static electricity, especially the upper end portion (collar portion of the wire winding body 2). The amount of increase in tension when unrolled from the base end portion S of the portion 3 is small and disconnection is unlikely to occur. Further, since the lower surface of the collar portion 3 of the bobbin 1 is not in contact with the lower surface of the bobbin 1, even if the collar portion 3 of the bobbin 1 is damaged, the wire rod 4 does not bite there and is not broken. When the bobbin cap 5 is damaged, the bobbin cap 5 may be removed from the collar portion 3 of the bobbin 1 to grind and remove the damage, or the bobbin cap 5 may be replaced. In particular, in this embodiment, since the outer peripheral side protruding portion 9 is formed so as to laterally protrude also on the outer peripheral surface of the bobbin cap 5, the contact length between the bobbin cap 5 and the wire 4 can also be minimized. Therefore, the feeding tension of the wire 4 can be further reduced and stabilized. Further, since the lower end side protruding portion 8 and the outer peripheral side protruding portion 9 are substantially semi-circular in cross section, the wire rod 4 and the lower end surface side protruding portion 8 and the outer peripheral side protruding portion 9 substantially contact each other at a point. It is possible to make the feeding tension of No. 4 extremely stable. Further, an angle θ formed by a straight line L connecting the lower end of the lower end side protruding portion 8 and the upper end S of the wire rod winding body portion 2 of the bobbin 1 and a plane M orthogonal to the axis of the bobbin 1 is the collar portion 3. Since the wire rod 4 has an angle of 3 to 30 ° with respect to the lower surface of the bobbin 1, the wire rod 4 contacts the lower surface of the collar portion of the bobbin 1 when the wire rod 4 is unwound from the upper end portion S of the wire rod winding body 2. Since there is no bending and the wire rod is not bent until it is guided to the lower end side protruding portion 8, disconnection is extremely unlikely to occur. Further, since the bobbin cap 5 is made of a fluororesin, the slidability at the time of feeding the wire 4 is good.

The first embodiment of the present invention has been described above with reference to the accompanying drawings. However, the present invention is not limited to the first embodiment and can be appropriately modified within the scope of the present invention. For example, the outer peripheral side projection 9 does not have to be one as in the present embodiment, but may be two or more. Further, when the diameter of the wire 4 is large, the payout speed is high, and the payout tension of the wire 4 is large, as shown in FIG. 4, the lower end edge of the flange 3 is locked to the inner surface of the fitting part 6. The bobbin cap 5 can be firmly fixed to the collar 3 by forming the portion 6A or forming the inner surface side of the fitting portion 6 in a tapered shape.

Next, the present invention will be described in more detail with reference to the following specific embodiments.

Example 1 and Comparative Example 1 A magnet wire (φ50 μm, polyurethane copper wire) is wound around a bobbin 1 as shown in FIGS. 1 to 3, and the bobbin 1 of one bobbin 1 has the above-mentioned first embodiment. The bobbin cap 5 of Example 1 was attached (Example 1), and the bobbin cap 5 was not attached to the other bobbin (Comparative Example 1). As shown in FIG. 5, the tension is measured by connecting the wire rod 4 fed from the bobbin 1 to the variable speed winding device 11 and installing the tension detecting device 12 while the wire rod 4 is running to measure the tension at the time of feeding. The change was recorded by the tension fluctuation recording device 13. At this time, the winding speed by the variable speed winding device 11 was changed to (a) 100 m / min, (b) 200 m / min and (c) 300 m / min. The results are shown in FIGS. 6 and 7. 6 and 7, A1 to C1 and A2 to C2 are tensions when the wire rod 4 is fed from the upper end portion (base end portion of the collar portion 3) S of the wire rod winding body portion 2, respectively. Yes, and usually the tension is at a maximum here.

As can be seen from FIGS. 6 and 7, by using the bobbin cap of the present invention, the fluctuation ratio of the tension is about 50% as compared with the comparative example 1 in which the bobbin cap is not attached, and between the winding speeds. It can be seen that the tension is reduced even when the maximum tension points (A1 and A2, B1 and B2, and C1 and C2) in (1) are compared.

Example 2 and Comparative Example 2 A magnet wire (φ50 μm, polyurethane copper wire) was wound with a bobbin winding for a relay coil having a square shape at an average feeding speed of 200 m / min, and the bobbin cap 5 was provided. The number of disconnections was compared. The results are shown in Table 1.

[0026]

[Table 1]

As is clear from Table 1, by using the bobbin cap of the present invention, the upper end portion (collar portion) of the wire rod winding body portion 2 having the maximum tension as compared with Comparative Example 2 in which the bobbin cap is not attached. It can be seen that the number of wire breaks at the base end portion 3) S is reduced to 1/5. Also, it can be seen that the number of wire breaks below the upper end S of the wire winding body 2 having relatively little tension is reduced to 60%.

[0028]

[Effect of device]

 A bobbin cap for feeding a wire according to claim 1 of the present invention is a cap for covering a collar portion of a collared bobbin including a wire winding body and flanges formed at both ends of the wire body winding body. Since the flange is provided with a fitting part to be fitted from above, and the fitting part has a lower end side protruding part projecting downward from the lower surface of the flange part, the bobbin with a collar is provided. When the wire rod is unwound from the winding body of the wire rod, the wire rod comes into contact with a protruding portion formed below the lower surface of the collar portion at the lower end side of the fitting portion of the bobbin cap and runs, so that they rub against each other. Since the length is short, the increase in tension due to static electricity is small and stable, and wire breakage is unlikely to occur. In addition, since it does not come into contact with the collar of the bobbin, even if the collar of the bobbin is damaged, the wire will not cut into it and break. If the bobbin cap is damaged, the bobbin cap may be removed from the collar of the bobbin and ground, or the bobbin cap may be replaced.

In the wire rod feeding bobbin cap of the second aspect, since the lateral projection is formed on the outer periphery of the cap, the contact length between the bobbin cap and the wire rod can be minimized. Therefore, it is possible to further stabilize the feeding tension of the wire rod.

In the wire rod feeding bobbin cap of claim 3, since the projecting portion on the lower end side and the projecting portion in the lateral direction are substantially semicircular in cross section, the wire rod and the projecting portions on the lower surface side and the outer peripheral side are formed. Since and are almost in point contact with each other, the feeding tension of the wire can be extremely stabilized.

In the wire rod feeding bobbin cap of claim 4, the line connecting the lower end of the protruding portion on the lower end side and the upper end of the wire rod winding body of the bobbin with respect to a plane orthogonal to the axis of the bobbin. Since the wire rod has an angle of 3 to 30 °, the wire rod does not come into contact with the lower end face of the bobbin when the wire rod is paid out from the upper end portion of the wire rod winding body of the bobbin. Since there is little bending of the wire until it is guided to the protrusion, disconnection is unlikely to occur.

Furthermore, in the bobbin cap for paying out the wire according to claim 5, the bobbin cap is made of a fluorine resin, a Delrin resin, a nylon resin, or a metal whose surface is subjected to a lubrication treatment. Good slipperiness when unreeling.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which a wire rod feeding bobbin cap according to a first embodiment of the present invention is mounted on a bobbin.

FIG. 2 is a cross-sectional view showing a state in which the wire rod feeding bobbin cap of the first embodiment is mounted on a bobbin.

FIG. 3 is a perspective view of the wire rod feeding bobbin cap of the first embodiment as seen from below.

FIG. 4 is a sectional view showing a state in which a bobbin cap for feeding wire according to a second embodiment of the present invention is mounted on a bobbin.

FIG. 5 is a schematic view showing an apparatus for measuring the tension applied to a wire rod when the wire rod is fed out.

FIG. 6 is a graph showing a change in tension when a wire rod is fed out in a bobbin equipped with the bobbin cap of the present invention.

FIG. 7 is a graph showing a change in tension when a bobbin alone is fed out.

FIG. 8 is a perspective view showing a state where a bobbin feeds a wire.

FIG. 9 is a cross-sectional view showing a wire rod feeding state by a bobbin.

[Explanation of symbols]

 1 bobbin 2 wire rod winding body 3 collar 4 wire rod 5 bobbin cap 6 fitting part 8 lower end side protrusion 9 outer peripheral side protrusion

Claims (5)

[Scope of utility model registration request] 1. A cap for covering a collar portion of a bobbin with a collar, comprising a wire rod winding body portion and a collar portion formed at both ends of the wire rod winding body portion, the cap being fitted to the collar portion from above. A bobbin cap for feeding a wire, comprising a fitting portion to be fitted, and the fitting portion having a lower end side protruding portion that protrudes downward from a lower surface of the collar portion. 2. The wire rod feeding bobbin cap according to claim 1, wherein a lateral projection is formed on the outer periphery of the bobbin cap. 3. The bobbin cap for feeding wire rod according to claim 2, wherein the projecting portion on the lower end side and the projecting portion in the lateral direction have a substantially semicircular cross section. 4. The line connecting the lower end of the protruding portion on the lower end side and the upper end of the wire rod winding body of the bobbin has an angle of 3 to 30 ° with respect to a plane orthogonal to the axis of the bobbin. The bobbin cap for feeding a wire according to claim 3. 5. The bobbin cap for feeding a wire rod according to claim 4, wherein the bobbin cap is made of a fluorine resin, a Delrin resin, a nylon resin, or a metal whose surface is lubricated. .