EP0411542A2 - Verfahren und Vorrichtung zur Herstellung von Spiralwiderständen - Google Patents

Verfahren und Vorrichtung zur Herstellung von Spiralwiderständen Download PDF

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Publication number
EP0411542A2
EP0411542A2 EP90114603A EP90114603A EP0411542A2 EP 0411542 A2 EP0411542 A2 EP 0411542A2 EP 90114603 A EP90114603 A EP 90114603A EP 90114603 A EP90114603 A EP 90114603A EP 0411542 A2 EP0411542 A2 EP 0411542A2
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EP
European Patent Office
Prior art keywords
swift
turns
width
blades
support
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.)
Withdrawn
Application number
EP90114603A
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English (en)
French (fr)
Other versions
EP0411542A3 (en
Inventor
Francesco Roggia
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0411542A2 publication Critical patent/EP0411542A2/de
Publication of EP0411542A3 publication Critical patent/EP0411542A3/en
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C17/00—Apparatus or processes specially adapted for manufacturing resistors
    • H01C17/04—Apparatus or processes specially adapted for manufacturing resistors adapted for winding the resistive element
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C3/00—Non-adjustable metal resistors made of wire or ribbon, e.g. coiled, woven or formed as grids
    • H01C3/14—Non-adjustable metal resistors made of wire or ribbon, e.g. coiled, woven or formed as grids the resistive element being formed in two or more coils or loops continuously wound as a spiral, helical or toroidal winding
    • H01C3/18—Non-adjustable metal resistors made of wire or ribbon, e.g. coiled, woven or formed as grids the resistive element being formed in two or more coils or loops continuously wound as a spiral, helical or toroidal winding wound on a flat or ribbon base
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/16—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor the conductor being mounted on an insulating base

Definitions

  • the present invention concerns a process and an apparatus for the manufacture of spiral-type electrical resistors.
  • "Spiral" electrical resistors are already known, particularly for use in air conditioners, consisting of a couple of strips made of insulating material, such as for instance micanite, each provided with a plurality of holes through which a wire, or strap, is passed, of resistive material so as to form a plurality of half turns projecting from the same side of the supporting strip.
  • the two strips are then coupled to form a single structure provided with a plurality of resistive "spirals", each consisting of two half turns opposite to one another and positioned on different strips.
  • resistors with elliptical spirals were proposed, provided with two insulating strips positioned near the ends of the resistor turns and housing said turns in a corresponding plurality of slits.
  • Said resistors are the object of Italian patent application n. 19355-A/85 as well as of Italian patent application n. 21428-A/89, both filed in the name of the Applicant.
  • the present invention provides a process for producing spiral electrical resistors, characterized in that it comprises the steps of: winding a preset length of resistive wire with a preselectable pitch around a swift having adjustable width to obtain a plurality of turns; blocking in position said turns on at least part of said swift; reducing the width of said swift; engaging at least some of said turns with at least one electrically insulating support; freeing said turns from said swift; withdrawing the resistor thus obtained from the swift having reduced width; and repeating said steps, restoring the original width of the swift before winding the subsequent length of wire.
  • the invention moreover comprises an apparatus for producing spiral electrical resistors, characterized in that it comprises: a swift having adjustable width; means to feed a length of resistive wire to said swift; means to reciprocally move the swift and said wire feeding means to obtain a plurality of turns with preset pitch; and blocking means to temporarily block in position said turns on at least part of said swift.
  • the swift width is preferably adjusted by means of one or more blades positionable sideways to a fixed and rotatable portion of said swift.
  • the process and apparatus according to the invention allow to automate the manufacture of the above described spiral resistors and to vary in a very simple way the size of said resistors, by replacing the side blades according to the width desired for the resistor, thus obtaining a considerable reduction in manufacturing costs.
  • the apparatus comprises a swift having adjustable width as a function of the manufacturing steps for the production of spiral resistors, means to secure and to feed a length of resistive wire 4 to said swift, means to reciprocally move the swift and said wire feeding means so as to obtain a plurality of turns with preset pace, and blocking means 6 to block temporarily in position on said swift a portion of the turns formed thereon.
  • the apparatus preferably comprises also means (not shown) for bringing said insulating supports into engagement with said turns as well as means (not shown) to withdraw the resistor provided with one or more insulating supports from the winding swift 1.
  • the swift 1 is mounted through shaft 1′ on a spindle 7 or similar means to be rotated about its own axis.
  • the means to secure and feed a length of resistive wire to the swift during the winding operation and the means to reciprocally move swift and feeding means are comprising a securing means 2 blocking the free end of the wire 4, a wire tightener 3 and a worm screw 5 on which the wire tightener 3 is movabble.
  • securing means 2 is shown exploded with respect to its actual position, that is laterally to swift 1, e.g. on spindle 7, in order to rotate with swift 1.
  • the swift is rotated but it remains fixed without translational motion, and the feeding means moves with respect to the swift; however the invention obviously comprises also embodiments where the reciprocal motion is reversed and those where the swift does not rotate while the wire is wound around it.
  • the swift 1 is preferably provided with a first fixed portion 1a fastened to the spindle 7 and rotatable about its own axis and at least a second portion securable to said fixed portion and movable in relation to the same to vary the swift width; in particular said second portion or portions are interchangeable as a function of the width desired for the winding swift.
  • said movable portions consist of blades 8 that can be positioned laterally to the fixed portion of the swift 1 by means of slots or similar guide means provided in a complementary way on said blades and on said fixed portion, as can be better seen in figure 2 (where one of the blades is shown in an exploded view to make the drawing better understandable), and indicated by references 9 and 10.
  • the fixed portion of the swift is preferably provided with means 11 to urge the blades 8 towards the outside when these are positioned onto the fixed portion 1a of the swift, sideways thereto.
  • the preferred embodiment shown comprises a couple of side blades 8 mounted on a portion 12 of a piston or similar means of translation, said portion 12 and said blades 8 being rotatable together with swift fixed part 1a.
  • Piston portion 12 is also provided with securing means 2′ to secure wire 4 before the next winding of a resistor, as better disclosed hereinbelow.
  • the blades 8 are preferably elastically hinged in 13 to portion 12, to allow their slight lateral movement effected by the urging means 11 provided inside the fixed portion of the swift 1a, consisting in this case of a couple of cams.
  • Said cams can be actuated by a rod 14 integral to the piston 12 and translatable therewith and with said blades, to urge the blades 8 towards the outside, once the correct positioning of the blades in respect to said fixed portion of the swift 1 has been obtained.
  • a longitudinal hole 14b is provided in the fixed portion of the swift 1 to temporarily house rod 14.
  • rod 14 can be permanently housed in hole 14b and be actuated by a pivot projecting from the piston 12 (not shown).
  • Figure 2 shows a particular configuration of the fixed portion of the swift 1a and of the blocking means 6, wherein said fixed portion 1a and said blocking means are provided with complementary shapings, such as male and female matching bulges 15 and 16 respectively, to shape on the turns of the resistor still wound about the swift a plurality of positioning saddles in which said insulating support, or supports, will be housed.
  • the shapings 15 are provided on the fixed portion of the swift 1 for reasons which will become obvious in the light of the process steps hereunder described.
  • the blocking means 6 are by stoppers, such as those shown in figure 2, or by combs or similar devices capable of keeping the pitch (i.e. the distance) of the turns during the step of positioning the insulating support.
  • a winding stage is provided to wind a preset length of said resistive wire 4 around the swift 1, which has the desired width to obtain a preset width of the resistor turns, that is, it is provided sideways with blades 8.
  • wire 4 end is secured to means 2 and, by actuating the worm screw 5 the wire tightener 3 is translated at a preset speed with respect to swift 1, that in the meantime is rotated at a preselected speed, in order to obtain a plurality of turns with a predetermined pitch that is depending on the reciprocal motion of said wire tightener and said swift.
  • means 6 is actuated to block the turns thus obtained on the fixed portion 1a of swift 1, wire 4 is cut to free the turns thus obtained from the remaining length of wire on tightener 3, and the other end of wire 4 is released from securing means 2.
  • the swift width is then reduced to leave sufficient room, in correspondence with the end of the winded turns, for the positioning of at least one electrically insulating support which is forced on said turns to engage with at least some of them and avoid they get in contact to each other during the subsequent use as resistor.
  • the next step provides the release of said turns from the swift by reversely actuating the blocking means 6, and the withdrawal of the resistor thus obtained from the swift; this operation is facilitated by the fact that the swift width has been previously reduced.
  • the width of the swift 1 is preferably adjusted by displacement and/or removal of one or more blades positionable sideways to the fixed portion of the swift and rotatable with spindle 7; the blades moreover are replaceable according to the width required for the resistor turns.
  • the preferred process using an apparatus of the type described in figures 2 and 3 provides to position two blades 8 sideways to said fixed portion 1a simultaneously stressing them towards the outside, for instance by means of cams 11 and rod 14, until the maximum preset width for the resistor turns is obtained.
  • the resistor obtained at this point is similar to the resistor 18 illustrated in figure 4, where for a better understanding of the drawing the swift 1 has been omitted.
  • first of all the swift width is partially reduced by translating slightly backwards piston 12, rod 14 and the blades 8, thus allowing the cams 11, which are elastically stressed towards a rest position, to be disengaged from the blades themselves. It thus is now possible to remove blades 8, withdrawing them from the fixed portion 1a and leaving a free room corresponding to their width adjacent to the turn ends.
  • the process according to the invention also envisages the possibility of using some further steps to obtain a radial resistor 20 of the type shown in figure 6.
  • the resistor comprises a central tubular support 21 appropriately made of an electrically insulating material and radially provided with a plurality of seats 22 designed to engage the end of a corresponding plurality of turns arranged radially to said support and provided with at least one flexible electrically insulating support 23 at a preselected distance from central support 21.
  • the process according to the invention envisages the additional steps of positioning at least a resistor obtained in the previously described way and provided with a single planar and flexible insulating support 23 in correspondence with the circular support 21; said planar support 23 is then bent by preferably acting on its ends by means of a template or similar device, until said ends are brought into contact to each other, and the ends of the turns adjacent to the circular support 21 are located in said superficial seats 22 of the support itself. Once the turns positioned, said ends of the supports 23 are fixed to one another so as to obtain a resistor with radial turns.
  • Two opposed resistors are preferably used, which are semicircularly bent and fixed to one another at the respective ends.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Apparatuses And Processes For Manufacturing Resistors (AREA)
EP19900114603 1989-08-02 1990-07-30 Process and apparatus for producing spiral resistors Withdrawn EP0411542A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8921428A IT1231096B (it) 1989-08-02 1989-08-02 Perfezionamento per la stabilizzazione meccanica delle resistenze a spire ellittiche appiattite.
IT2142889 1989-08-02

Publications (2)

Publication Number Publication Date
EP0411542A2 true EP0411542A2 (de) 1991-02-06
EP0411542A3 EP0411542A3 (en) 1991-05-22

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900114603 Withdrawn EP0411542A3 (en) 1989-08-02 1990-07-30 Process and apparatus for producing spiral resistors

Country Status (2)

Country Link
EP (1) EP0411542A3 (de)
IT (1) IT1231096B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0720183A2 (de) 1994-12-27 1996-07-03 Bobinajes Nugar, S.L. Biegsames Heizelement
KR100503434B1 (ko) * 2003-03-25 2005-07-22 이권연 권선저항기 제조용 피치 제어 및 코일과 권선저항기의 분리 감지 방법

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2645429A (en) * 1949-07-07 1953-07-14 Gen Electric Winding machine
DE2531854A1 (de) * 1975-07-16 1977-01-20 Bosch Siemens Hausgeraete Elektrischer heizkoerper fuer gasfoermige medien
DE2615013A1 (de) * 1976-04-07 1977-10-27 David & Baader Dbk Spezfab Verfahren zur herstellung eines elektroheizkoerpers

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2645429A (en) * 1949-07-07 1953-07-14 Gen Electric Winding machine
DE2531854A1 (de) * 1975-07-16 1977-01-20 Bosch Siemens Hausgeraete Elektrischer heizkoerper fuer gasfoermige medien
DE2615013A1 (de) * 1976-04-07 1977-10-27 David & Baader Dbk Spezfab Verfahren zur herstellung eines elektroheizkoerpers

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0720183A2 (de) 1994-12-27 1996-07-03 Bobinajes Nugar, S.L. Biegsames Heizelement
US5676872A (en) * 1994-12-27 1997-10-14 Bobinajes Nugar, S.L. Flexible heating element having a layer of fixing varnish
KR100503434B1 (ko) * 2003-03-25 2005-07-22 이권연 권선저항기 제조용 피치 제어 및 코일과 권선저항기의 분리 감지 방법

Also Published As

Publication number Publication date
EP0411542A3 (en) 1991-05-22
IT1231096B (it) 1991-11-18
IT8921428A0 (it) 1989-08-02

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