EP0300517A2 - Machine pour la formation d'ondulations dans un fil de résistance - Google Patents

Machine pour la formation d'ondulations dans un fil de résistance Download PDF

Info

Publication number: EP0300517A2
Authority: EP; European Patent Office
Prior art keywords: wire; shaping; fact; bending; injection
Prior art date: 1987-05-21
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.): Granted

Application number

EP88200978A

Other languages

German (de)

English (en)

Other versions

EP0300517A3 (en

EP0300517B1 (fr

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.)

1987-05-21

Filing date

1988-05-17

Publication date

1989-01-25

1988-05-17 Application filed by Aga Srl filed Critical Aga Srl

1988-05-17 Priority to AT88200978T priority Critical patent/ATE87121T1/de

1989-01-25 Publication of EP0300517A2 publication Critical patent/EP0300517A2/fr

1990-02-14 Publication of EP0300517A3 publication Critical patent/EP0300517A3/en

1993-03-17 Application granted granted Critical

1993-03-17 Publication of EP0300517B1 publication Critical patent/EP0300517B1/fr

2008-05-17 Anticipated expiration legal-status Critical

Status 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 household equipment generally employ a shaping system constituted by gears or disks into which wedges have been inserted. When they rotate, these gears on 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 because of the production of hot spots and a consequent interruption in the flow of electricity in the apparatus.
the machine of this invention brilliantly 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 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 is undergoes bending.
the machine according to the invention of this claim 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 at the terminal part of the guide which is shaped to form a chamber or free outlet zone Z in which the bending of the wire R takes place, and having 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 requirements.
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 bending 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
D the bending distance it determines the magnitude of the undulation produced and these parameters are directly proportional one to another. Therefore if the parameters are changed, undulated wire R′ of a different pitch and depth is produced, according to what is required.

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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)

EP88200978A 1987-05-21 1988-05-17 Machine pour la formation d'ondulations dans un fil de résistance Expired - Lifetime EP0300517B1 (fr)

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 true EP0300517A2 (fr)	1989-01-25
EP0300517A3 EP0300517A3 (en)	1990-02-14
EP0300517B1 EP0300517B1 (fr)	1993-03-17

Family

ID=11169660

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP88200978A Expired - Lifetime EP0300517B1 (fr)	1987-05-21	1988-05-17	Machine pour la formation d'ondulations dans un fil de résistance

Country Status (5)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US20110167888A1 (en) *	2008-09-16	2011-07-14	Bridgestone Corporation	Cord manufacturing apparatus and cord manufacturing method

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

1987
- 1987-05-21 IT IT20620/87A patent/IT1205666B/it active
1988
- 1988-05-17 DE DE8888200978T patent/DE3879306T2/de not_active Expired - Lifetime
- 1988-05-17 EP EP88200978A patent/EP0300517B1/fr not_active Expired - Lifetime
- 1988-05-17 ES ES198888200978T patent/ES2040322T3/es not_active Expired - Lifetime
- 1988-05-17 AT AT88200978T patent/ATE87121T1/de not_active IP Right Cessation

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US20110167888A1 (en) *	2008-09-16	2011-07-14	Bridgestone Corporation	Cord manufacturing apparatus and cord manufacturing method
US8402801B2 (en) *	2008-09-16	2013-03-26	Bridgestone Corporation	Cord manufacturing apparatus and cord manufacturing method

Also Published As

Publication number	Publication date
IT1205666B (it)	1989-03-31
EP0300517A3 (en)	1990-02-14
DE3879306T2 (de)	1993-07-22
EP0300517B1 (fr)	1993-03-17
IT8720620A0 (it)	1987-05-21
ES2040322T3 (es)	1993-10-16
DE3879306D1 (de)	1993-04-22
ATE87121T1 (de)	1993-04-15

Legal Events

Date	Code	Title	Description
1988-12-10	PUAI	Public reference made under article 153(3) epc to a published international application that has entered the european phase	Free format text: ORIGINAL CODE: 0009012
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