EP0489987B1 - Insulating tape for winding coils - Google Patents
Insulating tape for winding coils Download PDFInfo
- Publication number
- EP0489987B1 EP0489987B1 EP90312424A EP90312424A EP0489987B1 EP 0489987 B1 EP0489987 B1 EP 0489987B1 EP 90312424 A EP90312424 A EP 90312424A EP 90312424 A EP90312424 A EP 90312424A EP 0489987 B1 EP0489987 B1 EP 0489987B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- strips
- bobbin
- tape
- insulating
- guide sheet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/12—Insulating of windings
- H01F41/122—Insulating between turns or between winding layers
Definitions
- This invention relates to an insulating tape used for producing winding coils which are usually used in electric apparatus such as home electric appliances or in electronic devices used in telecommunication systems or the like.
- the winding coils used as the switching transformers or the like usually have the construction as shown in Fig. 3, with wirings 21 and insulated tape 22 alternately wound on a bobbin 10.
- the bobbin 10 has rim portions 12 and 13 provided on both ends of a body portion 11 thereof, as shown in Fig. 4.
- One of the rim portions for example, the rim portion 12, has a plurality of terminal portions 14 projected from a side surface.
- These bobbins 10 usually are given a common configuration instead of preparing several kinds of bobbins with different configurations for each winding coil.
- An insulating layer is usually formed on the body portion 11 of the bobbin 10 by winding narrow, insulating strips on the two side edge portions or one of the side edge portions, depending on the amount of wiring to be wound on the bobbin or the width of the winding in each winding layer.
- each bobbin 10 is shown schematically. One of the rim portions 12 thereof is omitted from each drawing to make them more understandable.
- narrow insulating strips 23 having a predetermined width are wound on both side edge portions of the body portion 11 to form ridged portions 23A and 23B, respectively (as shown in Fig. 5-A).
- the wiring material 21 is folded on the surface of the insulating tape 22 toward the terminal 14 (as shown in Fig. 5-D).
- two further narrow insulating strips 23 having a predetermined width are wound on the two end portions of the insulating tape 22 to form two further ridged portions 23A and 23B (as shown in Fig. 5-F).
- a wiring coil is produced provided with a plurality of wiring layers, as shown in Fig. 3.
- the wiring coil thus produced includes the narrow insulating strips 23 which form the ridged portions 23A and 23B as insulated layers.
- the narrow insulating strips have extremely small stiffness and strength since they are 0.05 to 1.0mm in thickness and 2 to 10mm in width.
- the insulating strips 23 are wound on the bobbin 10 or on a surface of the wiring material 21, the insulating strips 23 are twisted even with a slight tension applied thereto. This makes it difficult for the insulating strips 23 to be wound precisely on a predetermined place.
- tension when tension is applied to the insulating strips 23, they are deformed, for example, are reduced in the thickness or the width, or are broken, to make it difficult to form a predetermined insulating layer.
- insulating strips having relatively high stiffness and strength should be used. Further, the operator should wind the insulating strips on the bobbin with a great care so as not to apply unnecessary tension thereto.
- JP-A-1-71112 discloses the alternate application, around a bobbin of, firstly an insulation tape to which is permanently attached a pair of spaced apart narrow corrugated insulation strips which, on application, project radially outwardly of the bobbin, then an array winding of copper wire disposed on the insulation tape and between the corrugated insulation strips and then another insulation tape of the same construction as the first tape, and so on.
- the present invention seeks to provide an insulating tape for winding coils which facilitates accurate winding of insulated strips on a bobbin or the like in a wiring coil producing method and further enables the winding operation to be carried out automatically.
- the present invention provides a tape comprising a backing sheet having a predetermined width and, removably secured thereto, a strip of material provided on both surfaces of the material with adhesive, characterized in that the backing sheet has secured thereto a plurality of strips in a predetermined spaced relationship with one another, which strips are narrow strips of insulating material, two said strips being arranged at opposite longitudinal edges of the backing sheet, whereby the strips may be applied to a winding coil, the backing sheet being capable of serving as a guide sheet during the said application and thereafter being capable of removal from the strips.
- the invention provides a method of applying narrow strips of insulating material to a bobbin during production of a winding coil, which method comprises rotating the bobbin and supplying thereto a tape comprising a guide sheet having a predetermined width and to which the strips are secured in a predetermined spaced relationship with one another, the strips facing the bobbin during the supply thereto of the tape so as to provide on the bobbin a channel between respective strips spaced longitudinally apart from one another on the bobbin, which channel is thereby arranged to accommodate a coil of wire wound around the bobbin, characterized in that the strips have adhesive on both surfaces thereof and are releasably secured to the guide sheet, the method additionally including the steps of pressing the tape into contact with the bobbin so that the strips adhere thereto and removing the guide sheet from the tapes.
- the insulating tape 1 for winding coils of the present invention includes guide sheet 2 having a predetermined width and a plurality of narrow insulating strips 3 provided with adhesive on both surfaces thereof and removably connected to the guide sheet at predetermined spaces.
- the guide (release) sheet 2 is made of a nonadhesive sheet-like material, such as paper or plastic film.
- the insulating strips 3 are preferably made of an epoxy resin impregnated fabric tape. In the illustrated case they are provided along the edge margins of the sheet 2.
- the insulating tape for winding coils 1 of the present invention is wound on a reel 4 or the like made of paper or plastic. At one end, there is a portion on which the narrow insulating strips 3 are not provided, to form a portion 2a to be wound on a winding reel 5.
- the reel 4 on which the insulating tape is wound is mounted on a chuck (not shown) rotatably supported on a machine frame (not shown) or a movable arm (not shown) moving in both vertical and horizontal directions, then the end of the guide sheet 2 is withdrawn from the reel 4 and wound on a reel 5.
- the narrow insulating strips 3 are wound on a bobbin 10 while moving a pressing means 30 or a movable arm to a surface of the bobbin 10 or a surface of wound insulated tape 22 to make the insulating strips 3 contact the surface while the bobbin is rotated.
- the insulating strips 3 are adhered to the end surfaces of the bobbin in predetermined lengths by the rotation of the bobbin 10 to form the ridge portions 3A and 3B, respectively.
- the rotation of the bobbin is stopped.
- the pressing means 30 is removed from a contact position X at which the insulating strips 3 contact the surface of the bobbin and is moved to a position Y at which the insulating strips 3 do not contact the surface of the bobbin.
- the insulating strips 3 are cut with a suitable cutter (not shown).
- the bobbin 10 is started rotating to wind the wiring material 21 delivered from a reel 40 through a suitable guide member 41 onto the surface of the bobbin 10 and between the ridge portions 3A and 3B.
- insulating tape 22 delivered from a reel 30 through a suitable guide member 31 is wound on the bobbin 10 to cover the wiring material 21 and the ridge portions 3A and 3B.
- a portion of the wiring material 21 is folded on the surface of the insulating tape 22 and covered with the tape 22 during the sheet winding operation as shown in Figs. 5-D and 5-E.
- the pressing means 30 is again moved to the position X to bring the insulating strips 3 into contact with the surface of the insulating sheet previously wound thereto and covering a portion of the wiring material 21 to form stacked ridge portions.
- the guide sheet 2 provided with the insulating strips 3 is guided by the rim portions 12 and 13 of the bobbin.
- the insulating tape 1 of the present invention includes a guide sheet 2 having a wide width and a plurality of narrow insulating strips provided with adhesive on both surfaces thereof and since the guide sheet 2 has relatively high stiffness and high strength, there is no deformation or twisting due to tension or other external force applied thereto.
- the narrow insulating strips can be accurately wound on the surface portion of the bobbin alongside the rim portions 12 and 13.
- the guide sheet 2 is wound on the reel 5 after the narrow insulating strips 3 are removed therefrom and wound on the surface of the bobbin 10.
- the narrow insulating strips can be precisely wound at predetermined defined positions of the bobbin just by arranging an end of the guide sheet at a predetermined winding position with respect to the bobbin.
- an insulating layer having predetermined dimensions can be formed without deformation or twisting of the narrow insulating strips caused by tension or the like in the winding operation, since the narrow insulating strips are placed on the guide sheet.
- the operation for winding the narrow insulating strips on the surface of the bobbin can be carried out utilizing an automatic apparatus, resulting in improved production efficiency in the wiring coil production.
Description
- This invention relates to an insulating tape used for producing winding coils which are usually used in electric apparatus such as home electric appliances or in electronic devices used in telecommunication systems or the like.
- In electric apparatus such as home electric appliances or in electronic devices used in telecommunication systems or the like, the winding coils used as the switching transformers or the like usually have the construction as shown in Fig. 3, with
wirings 21 and insulatedtape 22 alternately wound on abobbin 10. - The
bobbin 10 hasrim portions body portion 11 thereof, as shown in Fig. 4. - One of the rim portions, for example, the
rim portion 12, has a plurality ofterminal portions 14 projected from a side surface. - These
bobbins 10 usually are given a common configuration instead of preparing several kinds of bobbins with different configurations for each winding coil. An insulating layer is usually formed on thebody portion 11 of thebobbin 10 by winding narrow, insulating strips on the two side edge portions or one of the side edge portions, depending on the amount of wiring to be wound on the bobbin or the width of the winding in each winding layer. - The manufacturing steps for producing the winding coil explained above illustrated in Fig. 5-A to 5-F.
- In these figures, each
bobbin 10 is shown schematically. One of therim portions 12 thereof is omitted from each drawing to make them more understandable. - First, narrow
insulating strips 23 having a predetermined width are wound on both side edge portions of thebody portion 11 to formridged portions - When an end portion of the
wiring material 21 is terminated with apredetermined terminal 14, not shown in Fig. 5-B, it is wound on thebody portion 11 of thebobbin 10 starting at the edge portion of theridged portion 23A (as shown in Fig. 5-B). - After a certain amount of the
wiring material 21 is wound on thebody portion 11 along a longitudinal direction thereof and when the wiring martial 21 reaches a position on which of end portion of the otherridged portion 23B exists (as shown in Fig. 5-C), an adhesive is coated over of whole surface of thewiring material 21 just wound on thebody portion 11, then a predetermined amount of aninsulating tape 22 having the same width as that of thebody portion 11 is wound on the adhesive layer. - After that, the
wiring material 21 is folded on the surface of theinsulating tape 22 toward the terminal 14 (as shown in Fig. 5-D). - When the
wiring material 21 is entangled with theterminal 14, a predetermined amount of theinsulating tape 22 is wound again on thebody portion 11 to cover thewiring material 21 arranged on the previously wound insulating tape 22 (as shown in Fig. 5-E). - After a first wiring layer is formed by the operation as explained above, two further narrow
insulating strips 23 having a predetermined width are wound on the two end portions of theinsulating tape 22 to form two furtherridged portions - Then, the wire winding operation as explained above is again carried out to form a second wiring layer, etc. Finally, a wiring coil is produced provided with a plurality of wiring layers, as shown in Fig. 3.
- As explained above, the wiring coil thus produced includes the narrow
insulating strips 23 which form theridged portions - However, the narrow insulating strips have extremely small stiffness and strength since they are 0.05 to 1.0mm in thickness and 2 to 10mm in width.
- Accordingly, when the
narrow insulating strips 23 are wound on thebobbin 10 or on a surface of thewiring material 21, theinsulating strips 23 are twisted even with a slight tension applied thereto. This makes it difficult for theinsulating strips 23 to be wound precisely on a predetermined place. - Also, when tension is applied to the
insulating strips 23, they are deformed, for example, are reduced in the thickness or the width, or are broken, to make it difficult to form a predetermined insulating layer. - Therefore insulating strips having relatively high stiffness and strength should be used. Further, the operator should wind the insulating strips on the bobbin with a great care so as not to apply unnecessary tension thereto.
- These problems cause extremely low operational efficiency for producing the wiring coils.
- The need to provide coil winding separated by insulation tape and including, on the bobbin, spaced apart narrow insulating strips also arises during the manufacture of transformers. Thus JP-A-1-71112 discloses the alternate application, around a bobbin of, firstly an insulation tape to which is permanently attached a pair of spaced apart narrow corrugated insulation strips which, on application, project radially outwardly of the bobbin, then an array winding of copper wire disposed on the insulation tape and between the corrugated insulation strips and then another insulation tape of the same construction as the first tape, and so on.
- The present invention seeks to provide an insulating tape for winding coils which facilitates accurate winding of insulated strips on a bobbin or the like in a wiring coil producing method and further enables the winding operation to be carried out automatically.
- According to one aspect the present invention provides a tape comprising a backing sheet having a predetermined width and, removably secured thereto, a strip of material provided on both surfaces of the material with adhesive, characterized in that the backing sheet has secured thereto a plurality of strips in a predetermined spaced relationship with one another, which strips are narrow strips of insulating material, two said strips being arranged at opposite longitudinal edges of the backing sheet, whereby the strips may be applied to a winding coil, the backing sheet being capable of serving as a guide sheet during the said application and thereafter being capable of removal from the strips.
- According to another aspect, the invention provides a method of applying narrow strips of insulating material to a bobbin during production of a winding coil, which method comprises rotating the bobbin and supplying thereto a tape comprising a guide sheet having a predetermined width and to which the strips are secured in a predetermined spaced relationship with one another, the strips facing the bobbin during the supply thereto of the tape so as to provide on the bobbin a channel between respective strips spaced longitudinally apart from one another on the bobbin, which channel is thereby arranged to accommodate a coil of wire wound around the bobbin, characterized in that the strips have adhesive on both surfaces thereof and are releasably secured to the guide sheet, the method additionally including the steps of pressing the tape into contact with the bobbin so that the strips adhere thereto and removing the guide sheet from the tapes.
- A preferred embodiment of the invention will now be described in more detail with reference to the accompanying drawings, wherein
- Figure 1 is a schematic perspective view of one embodiment of an insulating tape for winding coils of the present invention;
- Figure 2 is a schematic view of one embodiment of a winding operation of an insulating tape for winding coils of the present invention;
- Figure 3 is a schematic cross-sectional view of one embodiment of a wiring coil;
- Figure 4 is a schematic perspective view of one embodiment of a construction of a wiring coil used in the present invention; and
- Figures 5A to 5F are schematic views of steps in a wiring coil producing method.
- As explained above, the
insulating tape 1 for winding coils of the present invention includesguide sheet 2 having a predetermined width and a plurality ofnarrow insulating strips 3 provided with adhesive on both surfaces thereof and removably connected to the guide sheet at predetermined spaces. - The guide (release)
sheet 2 is made of a nonadhesive sheet-like material, such as paper or plastic film. - The
insulating strips 3 are preferably made of an epoxy resin impregnated fabric tape. In the illustrated case they are provided along the edge margins of thesheet 2. - The insulating tape for winding
coils 1 of the present invention is wound on areel 4 or the like made of paper or plastic. At one end, there is a portion on which the narrowinsulating strips 3 are not provided, to form a portion 2a to be wound on awinding reel 5. - When a wiring coil is produced utilizing the
insulating tape 1, as shown in Fig. 2, thereel 4 on which the insulating tape is wound is mounted on a chuck (not shown) rotatably supported on a machine frame (not shown) or a movable arm (not shown) moving in both vertical and horizontal directions, then the end of theguide sheet 2 is withdrawn from thereel 4 and wound on areel 5. - After this preparatory operation is completed, the wiring winding operation and the insulated
tape 22 winding operation are started. - The
narrow insulating strips 3 are wound on abobbin 10 while moving apressing means 30 or a movable arm to a surface of thebobbin 10 or a surface of wound insulatedtape 22 to make theinsulating strips 3 contact the surface while the bobbin is rotated. - Therefore, the
insulating strips 3 are adhered to the end surfaces of the bobbin in predetermined lengths by the rotation of thebobbin 10 to form theridge portions - After the predetermined lengths of the
insulating strips 3 are wound on thebobbin 10, the rotation of the bobbin is stopped. Thepressing means 30 is removed from a contact position X at which theinsulating strips 3 contact the surface of the bobbin and is moved to a position Y at which theinsulating strips 3 do not contact the surface of the bobbin. - Simultaneously with this movement of the
pressing means 30, theinsulating strips 3 are cut with a suitable cutter (not shown). - Then, the rotation of the
winding bobbin 5 for winding theguide sheet 2 is stopped. - After that, the
bobbin 10 is started rotating to wind thewiring material 21 delivered from areel 40 through asuitable guide member 41 onto the surface of thebobbin 10 and between theridge portions - After a predetermined amount of
wiring material 21 is wound on the bobbin,insulating tape 22 delivered from areel 30 through asuitable guide member 31 is wound on thebobbin 10 to cover thewiring material 21 and theridge portions - If required, a portion of the
wiring material 21 is folded on the surface of theinsulating tape 22 and covered with thetape 22 during the sheet winding operation as shown in Figs. 5-D and 5-E. - Then, the
pressing means 30 is again moved to the position X to bring theinsulating strips 3 into contact with the surface of the insulating sheet previously wound thereto and covering a portion of thewiring material 21 to form stacked ridge portions. - The same operation as explained above is repeated.
- In this operation, the
guide sheet 2 provided with theinsulating strips 3 is guided by therim portions - As explained above, since the
insulating tape 1 of the present invention includes aguide sheet 2 having a wide width and a plurality of narrow insulating strips provided with adhesive on both surfaces thereof and since theguide sheet 2 has relatively high stiffness and high strength, there is no deformation or twisting due to tension or other external force applied thereto. - Accordingly, the narrow insulating strips can be accurately wound on the surface portion of the bobbin alongside the
rim portions - On the other hand, the
guide sheet 2 is wound on thereel 5 after the narrowinsulating strips 3 are removed therefrom and wound on the surface of thebobbin 10. - Using the insulating tape for winding coils of the present invention, the narrow insulating strips can be precisely wound at predetermined defined positions of the bobbin just by arranging an end of the guide sheet at a predetermined winding position with respect to the bobbin.
- Also, an insulating layer having predetermined dimensions can be formed without deformation or twisting of the narrow insulating strips caused by tension or the like in the winding operation, since the narrow insulating strips are placed on the guide sheet.
- Moreover, the operation for winding the narrow insulating strips on the surface of the bobbin can be carried out utilizing an automatic apparatus, resulting in improved production efficiency in the wiring coil production.
Claims (5)
- A tape comprising a backing sheet having a predetermined width and, removably secured thereto, a strip (3) of material provided on both surfaces of the material with adhesive, characterized in that the backing sheet has secured thereto a plurality of strips (3) in a predetermined spaced relationship with one another, which strips (3) are narrow strips of insulating material, two said strips being arranged at opposite longitudinal edges of the backing sheet whereby the strips (3) may be applied to a winding coil, the backing sheet being capable of serving as a guide sheet (2) during the said application and thereafter being capable of removal from the strips (3).
- A tape according to claim 1, wherein each strip (3) consists of an epoxy resin impregnated fabric.
- A method of applying narrow strips (3) of insulating material to a bobbin (10) during production of a winding coil, which method comprises rotating the bobbin (10) and supplying thereto a tape comprising a guide sheet (2) having a predetermined width and to which the strips (3) are secured in a predetermined spaced relationship with one another, the strips (3) facing the bobbin (10) during the supply thereto of the tape so as to provide on the bobbin (10) a channel between respective strips (3) spaced longitudinally apart from one another on the bobbin, which channel is thereby arranged to accommodate a coil of wire (21) wound around the bobbin, characterized in that the strips (3) have adhesive on both surfaces thereof and are releasably secured to the guide sheet (2), the method additionally including the steps of pressing the tape into contact with the bobbin (10) so that the strips (3) adhere thereto and removing the guide sheet (2) from the tapes.
- A method according to claim 3, wherein two said narrow strips (3) of insulating material are arranged at respective opposite longitudinal edges of the guide sheet (2).
- A method according to claim 3 or claim 4, wherein each strip (3) consists of an epoxy resin impregnated fabric.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1990616444 DE69016444T2 (en) | 1990-11-14 | 1990-11-14 | Insulating tape for winding coils. |
EP90312424A EP0489987B1 (en) | 1990-11-14 | 1990-11-14 | Insulating tape for winding coils |
US07/839,688 US5284541A (en) | 1990-11-13 | 1992-02-24 | Insulating tape for winding coils |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP90312424A EP0489987B1 (en) | 1990-11-14 | 1990-11-14 | Insulating tape for winding coils |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0489987A1 EP0489987A1 (en) | 1992-06-17 |
EP0489987B1 true EP0489987B1 (en) | 1995-01-25 |
Family
ID=8205610
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90312424A Expired - Lifetime EP0489987B1 (en) | 1990-11-13 | 1990-11-14 | Insulating tape for winding coils |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0489987B1 (en) |
DE (1) | DE69016444T2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102623170B (en) * | 2012-04-16 | 2013-08-07 | 珠海市艾森科技有限公司 | Automatic rubber-coating device installed on automatic coil winding machine |
CN103258637B (en) * | 2013-05-07 | 2015-04-22 | 深圳市泰顺友电机电有限公司 | Multihead automatic coil winding and rubber belt packaging integrated machine |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54136653A (en) * | 1978-04-14 | 1979-10-23 | Tokyo Shibaura Electric Co | Winding apparatus |
-
1990
- 1990-11-14 DE DE1990616444 patent/DE69016444T2/en not_active Expired - Fee Related
- 1990-11-14 EP EP90312424A patent/EP0489987B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
& JP-A-59 2307 (MEIJI NATIONAL KOGYO K.K.) 07-01-1984 * |
Also Published As
Publication number | Publication date |
---|---|
EP0489987A1 (en) | 1992-06-17 |
DE69016444T2 (en) | 1995-05-24 |
DE69016444D1 (en) | 1995-03-09 |
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