US 2774018 A
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Description (OCR text may contain errors)
F. WEISS CONDENSERS Dec. 11, 1956 2 Sheets-Sheet 1 biled Sept. 29, 1952 IN! 'ENTOR.
A TTOR NE Y Dec. 11, 1956 F. WEISS 2,774,018
CONDENSERS Filed Sept. 29, 1952 2 Sheets-Sheet 2 I N V E NTOR.
- fZz/x fife-A519 ATTORNEY United States Patent CQNDE-NSERS Felix Weiss, Brookline, Mass., assignor to Cornell-Duhilier Electric Corporation, a corporation of Application September 29, 1952, Serial No. 312,075
3 Claims. ((11. 317-260) This invention relates to a rolled paper condenser and particularly to the interleaving of the insulating and conductive strips and the securing of the outer ends of the insulating strips to prevent the roll from unravelling.
This application is a continuation-impart of my copending application, Serial No. 616,825, filed September 17, 1945, and issued on November 11, 1952, as Patent No. 2,617,605, which is a division of application, Serial No. 553,776, filed September 12, 1944, and issued on September 18, 1945, as Patent No. 2,3 84,983.
An object of the invention is to provide a condenser roll that remains tightly and permanently wrapped.
Another object of the invention is to provide a condenser roll that is easily secured against unravelling.
A still further object of the invention is to provide a condenser roll that utilizes a minimum amount of adhesive or cementing material to secure a condenser roll.
Other and further objects of the invention will be apparent from the following description taken in connection with the accompanying drawings in which:
Fig. 1 is a perspective view of a condenser roll;
Fig. 2 is a side view of the outer end of the roll unravelled with the interleaved strips spaced to show the relation of the ends of the insulating and conductive strips;
Fig. 3 is a top view of the unravelled portion of the insulating and conductive strips;
Figs. 4 to illustrate the Steps of forming the condenser roll; and
Fig. 11 illustrates the severance of the composite condenser strip.
The condenser roll shown in the drawings is fully set forth in the aforementioned patent application 616,825 on the method of making the condenser roll and aforementioned Patent No. 2,384,983 on the machine for malting the condenser roll. The condenser roll has interleaved insulating strips 10, 11, 12, 13 and conductive strips 14, 15 to form a composite condenser strip 16, The strips are wound on a split mandrel 17 in a series of steps and ejected as diagrammatically illustrated in Figs. 4 to 10. The conductive strips 14-, 15 are shorter than the insulating strips so that the ends of the insulating strips extend beyond the ends of the conductive strips at bott ends of the composite strip. The insulating strips 10, 11, 12, 13 are evenly laid with the edges substantially even while the conductive strips 14, 15 are olfset from the insulating strips so that the conductive strip 14 protrudes out from one edge of the roll and conductive strip 15 protrudes out from the other edge of the roll. The conductive strips are of approximately the same width as the insulating strips so that there are insulating areas 13, 19 between the inside edges of the conductive strip and the edges of the insulating strip. The two conductive strips are thereby isolated from one another to prevent shorting of the conductive Strips or puncturing of the insulatin paper. The exposed rolled edges of the conductive strips 14, 15 form bases for attaching terminal leads to the condenser roll.
The outer or peripheral end 20 is fastened to the preceding layer of the composite strip by cementitious material pressed at spaced points Ztla, 20b, 2110 into the end of the insulating strips. The cementitious material penetrates the outer layer of insulating material to form a firm solid adhering mass.
The insulating strips and conductive strips are unreeled from their respective supply rolls (not shown) and are fed through feed rollers 23, 24 (Figs. 4 to 10) to form the composite condenser strip. The composite condenser strip passes through the foil severing mechanism 25 and is wound on the mandrel 17. The mandrel comprises two halves with a slot 26 in between. The forward or inner end of the composite strip is passed through this slot to form a gripping portion to wind the remainder of the strip on the mandrel. The conductive strips extend through the slot 26 as well as the insulating strips. The insulating strips being longer than the conductive strips have their forward or inner ends passed through slot 26 and are folded or rolled back on the forward or inner portion of the composite strip to form an initial inner roll core around which the composite condenser strip is wound.
.T he mandrel forms a passage extending axially through the condenser roll. The portion of the composite condenser strip held between the halves of the mandrel 17 in siot 26 traverses this passage.
The toll severing mechanism 2:5 temporarily separates the conductive strips from the insulating strips and then the foil and insulating strips are recombined into a composite strip. When the strips are separated, the cutting means in severing the conductive strips forms the ends e and f.
The insulating strips pass continuously through the foil severing mechanism 25 while the foil or conductive strips are severed into lengths to provide the proper capacitance. The foil supply reels are stopped on each severence for an interval of time to space the ends e and f of successive inductive strips apart so that a portion 27 (Fig. 11) of the layers of insulating strips are free of conductive material to provide end flaps 28, 29 to serve as a relatively short inner flap 2) as a gripping portion on the mandrel and a longer outer fastening flap 28 to secure the condenser roll as a unit. The condenser strip 16 is severed into desired lengths by the knife 31 cutting through the insulating strips 1t), 11, 12, 13. The mandrel 17 moves from station A to station E to position the portion of the strip free of conductive material opposite the knife 31 and needle 32. The succeeding mandrel is positioned at station A to receive the forward inner end of the strip 16 of the following condenser. The condenser strip 16 is then held between a wound condenser roll on the mandrel at station E and the succeeding mandrel at station A. The clear portion 27 thus held is severed by the cutting means 31. The needle 32 holds the inner end of the succeeding condenser taut until it is wound on the mandrel. At sta tion B, the forming of the condenser roll is completed with flap 29 wound into the core and flap 2% with its strip ends 213 at the periphery.
The adhesive material is applied by the grooved roller 34 (Figs. 4 to 10). The grooved roller is moved down to momentarily contact the glue roiler 35 and the adhesive or cementitious material is dauhed on a short arcuate portion of the grooved roller. The roller 34 returns to firmly engage the condenser roll and hold it tightly wound on the mandrel and apply the glue on the end of flap 23. The roller 34 and the condenser roll are synchronized so that the adhesive bearing portion of the roll will come in contact with the ends of the insulating strips and apply the cementitious material or adhesive to the ends 20 of the insulating strips. The insulating strip ends 21) are dry and absorb the adhesive. On the next turn, the clean surface of the grooved roller presses the strips together, squeezing the adhesive between the strips and cements the ends of the strips to the preceding completely wrapped layer to fasten the condenser roll in a tightly wound condition. The adhesive penetrates the ends of the strips and the outer strip of the preceding layer to form a mass of impregnated adhesive. The adhesive is applied at spaced areas along the roll with intervening uncemented areas in between. The grooved roller 34 presses against the condenser roll and deforms at 36 the peripheral sun face to tightly hold the wound condenser roll and cement the insulating strips together these deformed annular portions 36 are pressed into the outer periphery of the roll and hold the strips together.
The mandrel remains at station A until the condenser roll is almost completed. The mandrel is then moved to station E for severing and securing of the free end 20. At station C the halves of the mandrel are parted and at station D the arm 33 swings along the mandrel removing the finished condenser roll.
The sequence of operation can be readily perceived by reference to Figs. 4 to 10. In Fig. 4, condenser a is in the course of being rolled at station A and before the foils 14, 1.5 are severed by the severing mechanism 25. The foils or conductive strips have been cut and the gaps between the ends of successive foil strips are being formed. The condenser roll is then moved to station B where it is stationary. The cutting knife 31 and needle 32 are in a retracted position to permit the condenser roll to move to the next station.
In Fig. 6, the mandrel with the unsecured condenser roll is at station B and the retractable half of the mandrel is slid in place to grip the composite strips on both sides at station A for a succeeding roll. The grooved roll 34 is moved into contact with the roll, needle 32 pierces the insulating strip to hold the unwound composite strip taut after cutting and the knife 31 then cuts the insulating strip in Fig. 7. The ends 20, 29 of the insulating strip overlap the foil ends e and 1 respectively. In Fig. 8, the end 20 is wound onto the condenser roll and the end 29 is folded about the mandrel 17 to form a basis for a succeeding roll.
The grooved roller 34 moves down in Fig. 6 to contact the adhesive bearing roller 35 and received a daub of cementitious or adhesive material. The roller 34 then returns to its original position and engages the roll to turn with it, and deposit the glue on the end 20 of the condenser strip in Figs. 7 and 8 and press the adhesive into the insulating layers. In Figs. 8, 9 and 10, succeeding rolls are wound at station A while between stations C and D in Fig. 10 the roll is ejected by the arm 33.
Various modifications and changes may be made without departing from the scope of the invention.
1. An electrical condenser comprising a wound composite roll of interleaved insulating and conductive strips with the ends of the insulating strips extending beyond the ends of the conductive strips to form a peripheral binding portion, and deposits of cementitious material along the ends of siad insulating strips penetrating said ends and adsorbed by the material thereof so as to form masses of impregnating adhesive cementing the strip ends to each other and to the preceding underlying layer and fastening the condenser roll in Wound condition.
2. An electrical condenser as set forth in claim 1 in which the deposits of cementitious material are transversely spaced apart in regular manner so as to be separated by intervening uncemented spaces.
3. An electrical condenser as set forth in claim 1 in which the condenser roll has a series of transversely spaced, pressure deformed annular portions acting to tightly hold the wound condenser roll.
References Cited in the file of this patent UNITED STATES PATENTS 1,726,343 Danziger Aug. 27, 1929 1,986,680 Marcalus Jan. 1, 1935 2,333,570 Hild Nov. 2, 1943