EP0300517B1 - Maschine zur Herstellung von Meandern in Widerstandsdraht - Google Patents

Maschine zur Herstellung von Meandern in Widerstandsdraht Download PDF

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Publication number
EP0300517B1
EP0300517B1 EP88200978A EP88200978A EP0300517B1 EP 0300517 B1 EP0300517 B1 EP 0300517B1 EP 88200978 A EP88200978 A EP 88200978A EP 88200978 A EP88200978 A EP 88200978A EP 0300517 B1 EP0300517 B1 EP 0300517B1
Authority
EP
European Patent Office
Prior art keywords
wire
machine
shaping
counter
resistance wire
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
Application number
EP88200978A
Other languages
English (en)
French (fr)
Other versions
EP0300517A3 (en
EP0300517A2 (de
Inventor
Andrea Agogliati
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.)
Aga Srl
Original Assignee
Aga Srl
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Aga Srl filed Critical Aga Srl
Priority to AT88200978T priority Critical patent/ATE87121T1/de
Publication of EP0300517A2 publication Critical patent/EP0300517A2/de
Publication of EP0300517A3 publication Critical patent/EP0300517A3/en
Application granted granted Critical
Publication of EP0300517B1 publication Critical patent/EP0300517B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F1/00—Bending wire other than coiling; Straightening wire
    • B21F1/04—Undulating
    • 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

Definitions

  • the invention relates to a machine for shaping resistance wire which permits a high quality product to be obtained and is based on an original shaping principle which is highly innovative compared to techniques in current use and eliminates the relative disadvantages.
  • the machines which are currently used to shape resistance wire into undulations for the construction of electrical resistances for electrical household appliances generally employ a shaping system constituted by gears or disks into which wedges have been inserted. When they rotate, these gears or disks with inserted wedges drag and pull the resistance wire and shape it in accordance with the parameters of the resistance to be constructed.
  • the action of pulling the resistance wire causes stretching and also buckling of the wire, creating considerable disadvantages during the construction stage because of cracks in the wire and during utilisation in an electrical household appliance because of the production of hot spots and a consequent interruption in the flow of electricity in said appliance.
  • the machine according to the present invention eliminates the disadvantages of the technique currently used, since it is based on the original principle of injecting the resistance wire instead of pulling it and thus does not use gears or disks with wedges for shaping
  • the technical problem is solved by the invention, in which the wire is pushed and not pulled, feeding it in at a speed higher than the speed at which it exits from the machine, so that the wire is forced to bend at a precise point, determined by the parameters which can be changed as requested, and defined by the conformation of the elements which guide the wire inside the machine, and thus the wire does not come into contact with any mechanical part which can damage it at the point at which it undergoes bending.
  • the machine basically consists of an injection system constituted by two counter-rotating disks S and S' of a suitable shape, which form the thrust wheels for the resistance wire R coming from an appropriate feeding system which is not shown in the drawings; a wire guide G provided with a channel C for the injection of the wire R into a formation zone Z at the terminal part of the guide which is shaped to form a chamber of free outlet zone in which the bending of the wire R takes place.
  • This zone has a dimension D equal to the distance between the exit of channel C of wire guide G and a point of tangency with the braking system, constituted by two braking rollers or cylinders F and F' which are also counter-rotating at a peripheral speed which is appropriately lower than that of the direction of rotation of counter-rotating thrust disks S and S'.
  • forces D r are induced on the wire R in such a way as to oblige the wire to bend at a precise point.
  • the wire is pushed by two thrust wheels S and S' into an obligatory path, in other words channel C of guide G and carried in proximity to the braking wheels F and F' which are also rotating and constitute a partial obstacle because their peripheral speed is lower than that of the thrust wheels S and S'.
  • This obstacle can be fixed or mobile according to the shaping requirements of the wire.
  • This obstacle impedes the linear passage of the wire R, which is thus forced to discharge its surplus from the opposite formation zone Z of the guide, situated between the guide and the braking rollers F and F'.
  • the wire R will acquire the special undulating shape, which is produced by the combined forces of the speed and the bending resistance of the wire which come into play at all the points involved in the formation zone, as well as the walls of the guide.
  • V r relative speed V s - V f
  • V s the peripheral speed of the thrust wheels
  • V f the peripheral speed of the braking wheels
  • E the spring-back due to the elasticity of the wire
  • V r -E determines the quantity of the final product of undulated wire R' in m ⁇ 1

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Mechanical Engineering (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Wire Processing (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Golf Clubs (AREA)
  • Ropes Or Cables (AREA)
  • Apparatuses And Processes For Manufacturing Resistors (AREA)

Claims (1)

  1. Maschine zum Formen von Widerstandsdraht in eine wellenförmige Mäanderform zum Herstellen von elektrischen Widerständen, wobei die Maschine versehen ist mit: einem Drahteinspeissystem, welches sich aus zwei in entgegengesetzter Richtung rotierenden Scheiben (S,S') zusammensetzt, welche eine axiale Schubkraft auf den Draht übertragen; einer Drahtführung (G) mit einem Kanal (C) zum Einspeisen von Draht in eine Formgebungszone (Z), wobei die Formgebungszone durch eine freie Auslaßzone der Drahtführung ausgebildet ist; einem Bremssystem, weiches sich aus zwei in entgegengesetzte Richtung rotierenden Walzen (F,F') zusammensetzt, welche mit einer geringeren Umfangsgeschwindigkeit als derjenigen der in entgegengesetzter Richtung rotierenden Scheiben des Drahteinspeissystems rotieren; und wobei der Draht in der Formgebungszone (Z) geformt wird, in welcher überschüssiger Draht durch die Differenz der Geschwindigkeit des Einspeissystems und des Bremssystems geschaffen wird, und der Draht infolgedessen dazu gezwungen wird, sich selbst zu biegen und so die Form von wellenförmigen Mäandern einzunehmen.
EP88200978A 1987-05-21 1988-05-17 Maschine zur Herstellung von Meandern in Widerstandsdraht Expired - Lifetime EP0300517B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88200978T ATE87121T1 (de) 1987-05-21 1988-05-17 Maschine zur herstellung von meandern in widerstandsdraht.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2062087 1987-05-21
IT20620/87A IT1205666B (it) 1987-05-21 1987-05-21 Macchina per la sagomatura ad onda,col principio dell'iniezione,di filo resistivo per l'esecuzione di resistenza elettriche ed altri prodotti

Publications (3)

Publication Number Publication Date
EP0300517A2 EP0300517A2 (de) 1989-01-25
EP0300517A3 EP0300517A3 (en) 1990-02-14
EP0300517B1 true EP0300517B1 (de) 1993-03-17

Family

ID=11169660

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88200978A Expired - Lifetime EP0300517B1 (de) 1987-05-21 1988-05-17 Maschine zur Herstellung von Meandern in Widerstandsdraht

Country Status (5)

Country Link
EP (1) EP0300517B1 (de)
AT (1) ATE87121T1 (de)
DE (1) DE3879306T2 (de)
ES (1) ES2040322T3 (de)
IT (1) IT1205666B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5319219B2 (ja) * 2008-09-16 2013-10-16 株式会社ブリヂストン コード製造装置及びコード製造方法

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4072921A (en) * 1976-04-27 1978-02-07 Amf Incorporated Low inductance precision resistor deposited on an adhesive backing and wound on a bobbin

Also Published As

Publication number Publication date
IT8720620A0 (it) 1987-05-21
DE3879306D1 (de) 1993-04-22
ATE87121T1 (de) 1993-04-15
EP0300517A3 (en) 1990-02-14
IT1205666B (it) 1989-03-31
ES2040322T3 (es) 1993-10-16
DE3879306T2 (de) 1993-07-22
EP0300517A2 (de) 1989-01-25

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