US1789451A

US1789451A - Method of and apparatus for manufacturing electrostatic condensers

Info

Publication number: US1789451A
Application number: US113858A
Authority: US
Inventors: Rosaire Esme Eugene; Kerns Arthur David
Original assignee: Western Electric Co Inc
Current assignee: AT&T Corp
Priority date: 1926-06-05
Filing date: 1926-06-05
Publication date: 1931-01-20
Anticipated expiration: 1948-01-20

Description

Jan. 20, 1931. 5.15. ROSAIRE ET AL METHOD OF AND APPARATUS FOR MANUFACTURING ELECTROSTATIC CONDENSERS Filed June 5, 1926 Patented Jan. 20, 1931 4 UNITED STATES PATENT orricr.

ESME EUGENE ROSAIRE, OEHOUSTON, TEXAS, AND ARTHUR DAVID .KERN S, OE BLOCK- 'F IELD, NEW JERSEY, ASSIGNORS TO WESTERN ELECTRIC COMPANY, INCORPORATED,

OF NEW YORK, N. Y., A CORPORATION OF NEW YORK v METHOD OF AND AEPARATUS FOR MANUFACTURING ELI!GTROSTATIG CONDENSERS Application filed June 5,

This invention relates to a method of and apparatus for manufacturing electrostatic condensers and has for its principal object the construction of electrostatic condensers to definite measured capacities in a simple, inexpensive and expeditious manner.

In accordance with the object'of the present invention strips of paper or other dielectric and metal foil are assembled into a plurality of units which are individually subected to pressure and passed through a heated impregnating solution, preferably paraflin,

from which they pass to-a common point where an additional strip of paper or other dielectric is interposed between the units which are caused to adhere thereto. The composite units are then passed through a heated impregnating solution, also preferably paraffim-subjected to pressure for causing the intimate association of the respective elements and for expelling any entrapped ail and then wound in coil form until'a predeter- Fig. 3 is a fragmentary elevational view of.

a winding arbor with acondenser wound thereon showing the means for electrically connecting the condenser plates tothe associated circuit during the forming of the con-- ticed will lie/described. Referring to Fig. 1. of the drawing, the numerals 10, 11, 12 and- 13 represent supply rolls of paper or other dielectric material, and 14 and 15 supply rolls of tin foil or other material forming 1926. Serial No. 113,858.

the plates of the condensers, the width of the foil being sli htly less than that 'of the paper as shown in %ig..3. At 17 and 18 are indi-' cated pairs of heated rollers between which the sets of paper and foil strips 10, 11 and 14,-and 13 and 15 respectively are drawn, im 'mediately upon leaving their respective supply rolls, to remove any moisture which may may be heated either electrically or as illustrated by steam' supplied from a suitable vbe contained therein. The

rollers

17 and 18 source (not shown) through a pipe indicated at 19 and passing axially through each of the rollers. Receptacles containing fused dielectric material, which may be parafiin, are indicated at 20, 21 and 22, which may be heated by gas burners 23. A roller 24 is carried in each of the

receptacles

20, 21 and 22 around which the strips of paper and foil pass on their way through the receptacles, the paper strips itwill be apparent being impregnated Pairs of suitablepressure rollers are indicated at 25, 26 and 27 between which the paper and foil strips with the fused 1 paraflin.

pass upon emergence from the paraffin baths to cause a suitable adherence between the. strips passin therebetween. Associated with the receptac e 22 is another set of pressure rollers 28, between which the various strips pass after leaving the pressure rollers 25 and 26 and before their joint entrance into the receptacle 22. Upon leaving the pressure rollers 27 the several impregnated strips ofpaper and associated strips of tin foil are wound upon a winding arbor 30 which may be rotated in any suitable manner, for instance by a hand crank (not shown) I It will be apparent upon causing the arbor 30 to be rotated inthe 'direction indicated by the arrow (Fig. 1) that the several strips of paper and tinfoil will be simultaneously drawn from their respective supply rolls and wound into a coil upon the arbor in the following manner:

The paper strips 10 and 1 1 together with the strip of tin foil 14 form a unit or one set of strips, which is advanced .fromits respec; tive source of supply with the foil 14 outs1de 'of the two pa 1' strips; 10 and 11,-between ers I7, which serve to posithe heated [r01 tively remove any moisture contained in the paper strips, and thence under the roller 24 supported in the bath 20 which serves to impregnate the paper strips with parafiin. Upon emergence from the ath 20 the several strips are drawn between the pressure rollers to cause a close adherence of the impregnated dielectric strips 10 and 11 with the tin foil strip 14 to form a three ply composite strip indicated at 31. Simultaneously with the advance of the strips 10, 11 and 14 between the heated rollers 17 through the parafiin bath 20 and between the pressure rollers 25, the paper strip 13 together with the strip of tin foil 15 which forms a second unit is advanced from its respective source of supplyand treated'in a manner similar to that described in connection with the strips 10, 11 and 14 by being drawn between the heated rollers 18, through the parafiin bath 21 and between the pressure rollers 26 to form treated with para 11 and between the pressure rollers 27 to cause a close adherence of i the

composite strips

31 and 32 into a single composite strip 33.

Upon the condenser being wound to a predetermined capacity, as indicated by a ca-- pacity measuring device associated therewith to be described in detail hereinafter, the operator may sever the

composite strips

31 and 32 at the points indicated by the numerals 34, without, however, severing strip 12. The

.winding of the coil is thereafter continued until the balance of the

strips

31 and 32 associated with the arbor have passed through the bath 22, between the rollers 27 and wound upon the arbor 30 with a suiiicient length of the unsevered paper strip 12 wound thereon to form a protective covering. The paper strip 12 is then severed at a point indicated by the numeral 35 and the completed condenser roll removed from the arbor 30, and thereafterthe severed ends of the

composite strips

31 and 32 are brought into engagement with opposite surfaces of the paper strip 12 and caused to adhere thereto, the operation being facilitated by their previous treatment in the

paraflin baths

20 and 21. The free end of the paper strip 12 is then associated with the winding arbor 30 and the forming of the condenser roll continues, as hereinbefore described, until the predetermined capacity has been obtained, the paper strip 12 serving to thread the

composite strips

31 and 32 through the bath 22 and between the rollers 27 and to the winding arbor 30. Referring to Figs. 3 and 4 which i1lus-, trate the means for electrically connecting the metallic condenser plates 14 and 15 to the circuit during the winding of the condenser, the circuit serving to indicate when the condenser has reached a predetermined capacity, 36 and 37 indicate condenser terminals consisting of thin metal strips, preferably of tinned copper ribbon, which are slipped into position asthe

composite strips

31 and 32 are being formed into the single composite strip 33,-the terminals 36 and37 each being in electrical contact with one of the plates 14 and 15. Fixed to the arbor 30 is a collar 38 composed of insulating material, for instance, vulcanized hard rubber. Attached tothe periphery of the collar 38 at diametrically opposite points is a pair of spring clips 39 which, as clearly shown in Fig. 4, are designed to firmly engage the terminals 36 and 37. Secured to an insulating collar 40 in spaced relation with each other are a pair of contact rings 41 which are engaged by a pair of stationary brushes 42.

The circuit combinedwith a vacuum detector tube (Fig. 2), which is associated with the condenser during the forming-thereof, in practicin the method hereinbefore described and designed to indicate to the operator when the condenser has reached a predetermined capacity will now be described. The terminals 36 and 37 of the condenser (Figs. 3 and 4) during the winding thereof are connected to the circuit through the brushes 42 bearing upon the contact rings- 4lcarried by the Winding arbor 30, as her ein before described. Referring to Fig. 2, the numeral 45 indicates a suitable oscillatory circuit which includes a suitable source of current of constant frequency at approximately eighteen hundred cycles. The circuit 45 is connected to a vacuum tube 46 which has a tuned plate circuit consisting of a variable inductance 47 and a condenser 48 in parallel, which represents the condenser being wound, the brushes 42 hereinbefore mentioned being connected into the tuned plate circuit at points 49' and 50. When the condenser 48 reaches a predetermined capacity it forms a resonant circuit for the fixed frequency of the pulsating current flowing in the plate crcuit of the tube 46, at which time a large current will flow in the resonant circuit. The value of the capacity may be varied by varying the inductance 47. It will, therefore, be apparent that at any value of capacity of the condenser 48 during the winding thereof other than that at which the tuned plate circuit is" in resonance, the current through the condenser 48 and the variable inductance 47 is much smaller than the resonance value. A very small portion of the inductance 47, as indicated at 53, is conncctcd single composite strip and forming the latter to the grid electrode of a vacuum detector tube 54-which has a large amplification factor and the current flow through its plate circuit is reduced nearly to zero by a negative grid bias. .A sensitive relay 55 is included in the plate circuit of the tube 54. When the tuned plate circuit of the tube 46 is in resonance with the impressed'frequency, a large potential is induced upon the grid of the tube 54 by the current flowing in the variable inductance 47 which causes a rectified or uni-- a directional current to flow 1n the plate circult of-the tube 54, thereby energizing the relay 55 and closing a circuit which includes a signal lamp 57 which, in operating, indicates to the operator winding the condenser that the capacity thereof has reached a predeterv mined value.

What is claimed is:

1. The method of forming electrostatic condensers, which consists in simultaneously advancing a plurality of separate units of strips of fibrous material and strips of metal through a fused dielectric material, subjecting the several strips comprising each unit to pressure upon both faces immediately upon emergence therefrom so as to form the several strips into composite strips, interposing a strip of fibrous material between the com= posite strips, subjecting the composite strips and the interposed strip to pressure, advancing the whole through a fused dielectric material and again subjecting the same to pressure to cause a close adherence of the composite strip and the interposed strip into a intoa roll.

2. The method of forming electrostatic condensers, which consists in simultaneously heating and advancing a plurality of separate units of strips of fibrous material and strips of metal through a fused dielectric material, causing a close adherence of the several strips comprising each unit into a composite strip,

inter-posing a strip of fibrous material between the composite strips, advancing the whole through a fused dielectric material,

applying pressure to both faces thereof to .cause a close adherence of the composite strips and the interposed strip into a singlet composite strip and forming the latter into a roll.

3. The .method of forming electrostatic condensers, which consists in simultaneously advancing a plurality of strips of fibrous material and a strip of metal with the latter positioned outside of the former through a fused dielectric material, causing a close ad.- herence of the several strips into a composite strip immediately upon emergence therefrom, interposing a strip of fibrous material into adjacent relationship with the strip of metal, advancing a strip of fibrous material and a strip of metal through a fused dielectric material, causing a close adherence of the latter strips into a composite strip immediately upon emergence therefrom. advancing the whole through a fused dielectric material, subjecting the whole to pressure upon both its faces to remove excess dielectric and form a single composite strip and forming the latter into a roll.

4. The method of manufacturing electrostatic condensers, which consists in assembling a plurality of strips of dielectric and metallic elements in predetermined relation, interposing a dielectric stripbetwcen the thus assembled strips, advancing through a treating bath, forming the treated strips into a roll. and continuously testing the metallic elements for capacity during such assembly.

5. In combination with apparatus for forming electrostatic condensers, means for assembling a plurality of fibrous and metallic tallic elements of the condenser being formed and an inductance, a source of pulsating current associated therewith, and means operable when a condition of resonance is obtained between the circuit and the current source for indicating when the condenser in process of being formed has reached a predetermined capacity.

7. The combination with apparatus for forming electrostatic condensers, means for assembling a plurality of fibrous and metallic elements arranged in prcdetcrmim-d relation into a roll of a circuit including the metallic elements of the condenser being formed and an inductance, a source of pulsating current associated therewith, and means under the control of the circuit when resonance is obtained between the circuit and the current source for indicating when the condenser in process of being formed has tion into a roll of a circuit including the metallic elements of the condenser being formed and an inductance, a source of pulsating current connected thereto, a vacuum detector tube connected to the circuit, and electro-magnetically, oper'ated means connected in the plate circuit thereof and dcsigned to be operated vhen resonance is ob the strips tained between the first mentioned circuit and the current source for indicating when the condenser in process of being formed has reached a predetermined capacity.

9. The combination with apparatus for forming electrostatic condensers, means for assembling a plurality of fibrous and metallic elements arranged in predeterminedrelation into a roll of a circuit including. the metallic elements of the condenser being formed connected in parallel with a variable inductance, a source of pulsating current connected to the circuit, a vacuum detector tube having its grid connected to the inductance, electromagnetically operated means connected in the plate circuit thereof and designed to be operated when resonance is obtained between the circuit and the current source, and an electrically operated signaling device and circuit therefor designed to be closed by the operation of the relay when the condenser in process'of being formed has reached a pre determined capacity.

10. The combination with apparatus for forming electrostatic condensers, means for assembling a plurality of fibrous and metal lic elements arranged in predetermined relation into separate composite strips and advancing the same to a common point, a receptacle containing a fused dielectric material, a strip of fibrous material threaded therethrough, means for causing an adherence of the composite strips to the latter strip of fibrous material, means for advancing the associated strips through the material and compressing the same upon emergence therefrom into a single composite strip and form- IHI ing the latter into a roll, of means associated with the metallic elements and responsive when a predetermined capacity has been at tained therein for indicating when the condenser in process of .being formed has reached a predetermined capacity.

11. The method of operating an apparatus for forming electrostatic condensers, where- 'in two outer strips and an inner strip are s1- multaneously passed through a series of rolls and wound upon an arbor, which consists in severing at a determined instant the outer strips at a point to the rear of said rolls, continuing the winding of the inner strip to complete the condenser,.severing the inner strip at a point forward of the rolls, attaching the outer strips to the inner strip at .a point to the rear of the rolls, and repeating the operation.

12. The method of forming electrostatic condensers b means of an apparatus comprising a series of rolls and an arbor, which comprises simultaneously passing two outer strips and an inner strip through' the rolls to the arbor, severing the outer strip at a. point to the rear of said rolls, continuing the forward of said rolls, causing the ends of the outer strips to adhere to the inner strip at a point to the rear of said' rolls, and repeating the operation.

13. In an apparatus for manufacturing electrostatic condensers, a rotating arbor for winding aplurality of dielectric and metallic elements in predetermined relation thereon, contacting means carried by the arbor for making an electrical connection to the rotating metallic elements, and means engaging the contacting means for continuously testin the elements for capacity.

n witness whereof, we hereunto subscribe our names this 7th day of May A. D., 1926.

ESME EUGENE ROSAIRE.

ARTHUR DAVID KERNS.

winding of the inner strip to complete the condenser, severing the inner stripat a point