US3315508A - Lamp filament winding machine - Google Patents

Lamp filament winding machine Download PDF

Info

Publication number
US3315508A
US3315508A US346297A US34629764A US3315508A US 3315508 A US3315508 A US 3315508A US 346297 A US346297 A US 346297A US 34629764 A US34629764 A US 34629764A US 3315508 A US3315508 A US 3315508A
Authority
US
United States
Prior art keywords
wire
bobbin
winding
filament
winding head
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
US346297A
Other languages
English (en)
Inventor
Stanley J Mikina
Merrideth D Wilson
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.)
Philips North America LLC
Original Assignee
Westinghouse Electric Corp
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 Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US346297A priority Critical patent/US3315508A/en
Priority to GB53033/64A priority patent/GB1031340A/en
Priority to NL6500335A priority patent/NL6500335A/xx
Priority to FR6093A priority patent/FR1424924A/fr
Priority to BE660011A priority patent/BE660011A/xx
Application granted granted Critical
Publication of US3315508A publication Critical patent/US3315508A/en
Assigned to NORTH AMERICAN PHILIPS ELECTRIC CORP. reassignment NORTH AMERICAN PHILIPS ELECTRIC CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WESTINGHOUSE ELECTRIC CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K49/00—Dynamo-electric clutches; Dynamo-electric brakes
    • H02K49/02—Dynamo-electric clutches; Dynamo-electric brakes of the asynchronous induction type
    • H02K49/04—Dynamo-electric clutches; Dynamo-electric brakes of the asynchronous induction type of the eddy-current hysteresis type
    • H02K49/046—Dynamo-electric clutches; Dynamo-electric brakes of the asynchronous induction type of the eddy-current hysteresis type with an axial airgap
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F3/00—Coiling wire into particular forms
    • B21F3/02—Coiling wire into particular forms helically
    • B21F3/04—Coiling wire into particular forms helically externally on a mandrel or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
    • B65H59/02—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating delivery of material from supply package
    • B65H59/04—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating delivery of material from supply package by devices acting on package or support
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H81/00—Methods, apparatus, or devices for covering or wrapping cores by winding webs, tapes, or filamentary material, not otherwise provided for
    • B65H81/06—Covering or wrapping elongated cores
    • B65H81/08—Covering or wrapping elongated cores by feeding material obliquely to the axis of the core

Definitions

  • INVENTORS 45 Z w M W M w m J 0,, Y5 Em m m5 S United States Patent 3,315,508 LAMP FILAMENT WINDING MACHINE Stanley J. Mikina, Penn Hills, and Merrideth D. Wilson, Monroeville, Pa., assignors to Westinghouse Electric Corporation, Pittsburgh, Pa., a corporation of Pennsylvania Filed Feb. 20, 1964, Ser. No. 346,297 12 Claims. (CI. 72-66)
  • the present invention relates to a machine for the winding of fine wire coils and, more particularly, to such a machine which produces filaments for electric lamps at a greater rate than heretofore and with increased quality of the finished product.
  • Machines for the winding of lamp filaments are now well known in the art but such machines have heretofore been limited in their production rate because of several factors. For example, it is necessary that a certain tension be applied to the filament 'wire and hence the spooled bobbin from which the relatively fine tungsten wire is unwound must necessarily have a slight drag. This is to preclude too free a rotation and thus eliminate the possibility of looping or tangling of the wire while maintaining the required tension which may be as much as 50 grams.
  • the spin velocity of the bobbin relative to its shaft approximates one percent the speed of the winding head, depending, of course upon the particular wire size, bobbin diameter, and diameter of the mandrel wire, which in a large percentage of instances represents a bobbin speed velocity of about 100 r.p.m. at a winding head speed of 8000 rpm.
  • This relatively low spin speed of the bobbin has been heretofore accomplished by the employment of small and accurate bushing-shaft clearances and the use of a relatively high viscosity lubricant therebetween in order to develop the above-noted required tensions.
  • bridge pin is utilized to heat the filament wire, as well as the mandrel wire, for the purpose of annealing the tungsten filament wire in order to make the inside diameter of the formed helix conform more accurately to mandrel wire diameter without cracking or breaking of the fine filament wire.
  • bridge pin which is of relatively low electrical resistance, has been heated by an electric current supplied thereto by brushes, resulting in the voltage drop at the brushes consuming about seventy percent of the applied voltage.
  • Another object of the present invention is the provision of a filament winding machine wherein the filament wire is maintained under a substantially constant preselected tension by means of a magnetic field.
  • a further object of the present invention is the provision of a filament winding machine wherein the bridge pin is heated to a definite substantially constant temperature by making such bridge pin a part of an alternating current generator.
  • a centrifugal clutch is utilized to apply a decelerating torque to the bobbin to thus maintain filament-wire tension during the short stopping pe riod.
  • a centrifugal clutch is utilized to apply a decelerating torque to the bobbin to thus maintain filament-wire tension during the short stopping pe riod.
  • such bridge pin is made an integral part of an alternating current generator which itself is part of the winding head. Heating of the bridge pin to a desired magnitude is accomplished by varying the generator field which is indicated on a field ammeter calibrated in terms of bridge pin amperes.
  • FIGURE 1 is a fragmentary top plan view of a filament winding machine constructed in accordance with the present invention and showing the electric circuitry in conjunction therewith;
  • FIG. 2 is a sectional view taken on the line II-II of FIG. 1 looking in the direction indicated by the arrows;
  • FIG. 3 is a sectional view taken on the line IIIHI of FIG. 2;
  • FIG. 4 is a sectional view taken on the line IV-IV of FIG. 2;
  • FIG. 5 is a sectional view taken on the line VV of FIG. 2;
  • FIG. 6 is a fragmentary view similar to FIG. 5 but on a slightly larger scale.
  • FIG. 7 is a sectional view taken on the line VH-VII of FIG. 6.
  • the filament winding machine as therein shown and described comprises a base 5 having mounted thereon a gear housing 6.
  • a gear housing 6 Such housing is provided with a sleeve 7 carrying bearings 8 at each end thereof in which the hollow main drive shaft 9 of the machine is journalled, see FIG. 2.
  • Interiordrel advances.
  • this main drive shaft 9 is provided with an integral worm 10 meshing with a gear 12 carried 'by a shaft 13 extending to the turns per inch (t.p.i.)
  • This drive shaft 9 carries a combination drive-pulley and flywheel 15 while the other end carries a flywheel 16 which supports a frame 17 carrying a wire guide tube 18 and an alternating cur-rent generator armature 19.
  • the combination drive-pulley-flywheel 15, together with the main shaft 9 and parts carried thereby and comprising the winding head, are rotated by an endless belt 20 extending from an induction motor (not shown) with the two flywheels 15 and 16 serving to minimize speed fluctuations due to momentary variations either in the driving torque or the load torque.
  • Coaxially disposed within the hollow main shaft 9 is another hollow-bore shaft 22 journalled on bearings 23 and on which the bobbin 24 is mounted from which the fine tungsten filament wire 25 is unspooled.
  • the filament wire '25 upon leaving the bobbin 24 passes through a wire feeding means comprising the guide tube 18 and is then fed to a wedge-shaped space between the nose of a tungsten-carbide-tipped mandrel guide or bearing 28 and a heating means comprising the heated bridge pin 29 where such fine filament wire is wound in the form of a spring-like helix 30 upon the mandrel wire 14 by rotation of the winding head.
  • the mandrel wire 14 advances axially through the ho-llow-bore shaft 22 and outwardly of the mandrel guide 28 at a rate of advance determined by the revolutions per minute speed of the winding head and the worm 10 and gear 12, which drive the conventional t.p.i. capstan in order to fix the turns per inch of the filament helix 30, as
  • the tungstencarbide-tipped mandrel guide 28 isaxially biased by a coil spring 32 against the heated bridge pin 29 with the [latter being positioned normal to the axis of the mandre-lwire 14 and extending above the latter, so that the filament wire 25 coming 'out of the guide tube 18 passes on the inside of the bridge pin 29 andabove the mandrel wire 14 as it is wound upon the latter.
  • a coil spring 32 against the heated bridge pin 29 with the [latter being positioned normal to the axis of the mandre-lwire 14 and extending above the latter, so that the filament wire 25 coming 'out of the guide tube 18 passes on the inside of the bridge pin 29 andabove the mandrel wire 14 as it is wound upon the latter.
  • electromagnet coil means or assemblies 34 and 35 are provided each of which comprises an exciting coil 36 and an iron core terminating in pole pieces 37 and 38 with the drag disc 33 being rotatable in the air gap therebetween.
  • electromagnet assemblies 34 and 35 are secured to a circular frame 39 journalled upon bearings 48 and carried by a short shaft 42 coaxially disposed relative to shaft 22 and the drag disc 33 affixed thereto.
  • the frame supporting shaft 42 is secured to an upright 43 extending from the base 5 and a stop-pin 44 projects from such upright parallel to the frame shaft 42 for the purpose of limiting axial rotation on the magnet frame 39 together with its electromagnet assemblies 34 and 35, and such rotation itself is restrained by a spiral spring 45 formed of two Phosphor bronze wires. 7
  • the two electromagnet assemblies 34 and 35 are located diametrically opposite to each other and they porting bearings 23 of the drag disc shaft 22 or the bearings of the magnet frame 39.
  • the magnet exciting coils 36 are energized with direct current from a first power supply means or source 46(FIG. 1) formed by power rectifier circuits which is connected to the exciting coils 36 by the Phosphor bronze spring wires to thus avoid indication errors by elimination of slip.
  • the currentconducting spring wires 45 are designed for an angular, travel of the circular or drum-shaped magnet frame 39 7 through an angle of approximately as limited by the stop-pin 44, with graduations 47 onthe frame drum giving an indication in terms of grams of wire tension.
  • a centrifugal clutch is provided by the present invention for automatically applying a friction decelerating torque to the bob'bin 24 to maintain filament tension during the short stopping period.
  • This centrifugal clutch as shown particularly in FIGS. 1 and 4, comprises two diametrically opposed brake shoes 48 biased by coil springs 49 into contact with the peripheral surface of the bobbin hubbrake drum 27. Since the brake shoe shafts 50 fit into holes provided in the winding head supporting frame 17 they rotate with such Although such graduations 47 maybe in terms of wire tension it actually constitutes a measurement of the torque frame and winding head with the mass of each brake shoe 48 being such that the centrifugal force causes radial sliding movement of the brake shoe shafts 50 together with a slight compression of the springs 49, so that the brake springs 49 apply sufficient brake torque to the bobbin assembly to effect the desired deceleration yet allow slippage at a permissible value of wire tension to allow coil winding without breakage of the fine filament wire 25 during the acceleration and deceleration period.
  • each brake shoe 48 is selected to cause each shoe to throw out radially and disengage the bobbin hub brake drum 27 at a winding head speed of 5000 rpm.
  • the tension of filament wire 25 is determined by the drag disc 33, while below the 5000 r.p.m. speed during acceleration or deceleration the wire tension represents the sum of the drag disc effect and .the brake shoe torque, with the former decreasing to zero linearly with speed while the latter increases from zero as the square of the speed ditference between 5000 rpm. and the actual speed, until it reaches maximum braking torque at standstill.
  • the laminated armature coil means 19' of such generator is secured to and hence rotates coaxially with the winding head frame 17.
  • Such laminated armature 19 is disposed between stationary pole pieces 52 and 53 of an clectromagnet supported by an upright 54 extending from the base 5 and having its exciting coil 55 connected to the second power supply means or direct current supply source 46 and constituting the power rectifier circuits shown in FIG. 1 with the magnitude of the current controlled by a variable resistor 56.
  • FIGS. 1 As shown in FIGS.
  • the center leg of the laminated armature 19 is provided with a single layer winding 57 having its respective end terminals connected directly to opposite ends of the low resistance bridge pin 29.
  • the periodic reversals of magnetic flux through the rotating armature coil 57 generates an alternating current and since the bridge pin 29 is of low resistance, the armature coil 57 needs only to be of the single layer of comparatively few turns as shown, to develop a relatively high heating current which is passed through the bridge pin 29.
  • an armature winding of only eighteen turns is suflicient to cause a current of 14 amperes to how through the bridge pin 29.
  • the armature reactance Lw must be made equal to the bridge pin resistance. That is:
  • the generated voltage is:
  • the magnitude of the bridge pin heating is adjusted by varying the generator field through operation of the variable resistor 56 and an indication of such setting is given by a field ammeter 58 calibrated in terms of bridge pin amperes. Also, the position of the bridge pin 29 tangent to the mandrel wire 14 is adjustable as is customary in the art.
  • uniformity of the finished filament coil is achieved by maintaining the bridge pin at a constant preselected temperature to thus assure uniform formation of the fine filament-wire helix on its mandrel wire by connecting such bridge pin as a load across the output of an alternating current generator forming an integral part of the winding head of the machine.
  • the electromagnet assemblies 34 and 35 could be replaced by permanent magnets.
  • adjustment of the drag could be made by moving the permanent magnets in and out so that the effective speed and radius of the disc 33 would vary, depending on the position of the permanent magnets.
  • a winding head for supporting a mandrel guide through which a mandrel wire is advanced, together With a bobbin supplying a fine filament wire, and a bridge pin, said head being operable upon rotation to draw the fine filament wire from said bobbin across said bridge pin and wind such wire in the form of a tight helix upon said mandrel wire as it is advanced;
  • a Winding head for supporting a mandrel guide through which a mandrel wire is advanced, together with a bobbin supplying a fine filament wire, and a bridge pin, said head being operable upon rotation to draw the fine filament wire from said bobbin across said bridge pin and wind such wire in the form of a tight helix upon said mandrel wire as it is advanced;
  • control means carried by said machine adjacent said drag torque means and operable to cause the V latter to apply a preselected drag torque to the bobbin carried by said winding head
  • control means carried by said machine adjacent said drag torque means and operable to cause the latter to apply a preselected drag torque to the bobbin carried by said winding head
  • a winding head for supporting a mandrel guide through which a mandrel wire is advanced, together with -a bobbin supplying a fine filamentwire, and a heated bridge pin, said head being operable upon rotation to draw the fine filament wire from said bobbin across said heated bridge pin and wind such Wire in the form of a tight helix upon said mandrel wire;
  • (b) means connected to said bridge pin for heating the same to a uniform temperature comprising an alternating current generator provided with an exciting coil and an armature winding carried by said winding head and operable by rotation of the latter to cause its armature winding to generate an alternating current for heating said bridge pin to a substanti-ally constant temperature;
  • variable voltage source connectable by an operator to said generator exciting coil to energize the latter with a preselected voltage to cause said armature winding to supply a preselected current to said bridge pin to control the magnitude of its temperature
  • a winding head for supporting a mandrel guide through which a mandrel wire is advanced, together With a bobbin supplying a fine filament wire, and a heated bridge pin, said head being operable upon rotation to draw the fine filament wire from said bobbin across said heated bridge pin and wind.
  • such wire in the form of a tight helix upon said mandrel wire as it is advanced;
  • a winding head for supporting a mandrel guide through which a mandrel wire is advanced, together with a bobbin supplying a fine filament wire, and a heated bridge pin, said head being operable upon rotation to draw the fine filament wire from said bobbin across said heated bridge pin and wind such wire in the form of a tight helix upon said mandrel wire as it is advanced;
  • a winding head for supporting a mandrel guide through which a mandrel wire is advanced, together with a bobbin supplying a fine filament wire, and a heated bridge pin, said head being operable upon rotation to draw the fine filament wire from said bobbin across said heated bridge pin and wind such wire in the form of a tight helix upon said mandrel wire;
  • a centrifugal clutch carried by said winding head and operable to apply a decelerating torque to said rotating bobbin upon deceleration of said winding head below a predetermined speed thereby preventing possible overriding therebetween during deceleration and maintaining suflicient tension of said fine filament wire to eliminate possible tangling thereof
  • a winding head for supporting a mandrel guide through which a mandrel wire is advanced, together with a bobbin supplying a fine filament wire, and a heated bridge pin, said head being operable upon rotation to draw the fine filament wire from said bobbin across said heated bridge pin and wind such wire in the form of a tight helix upon said mandrel wire,
  • a filament coiling apparatus comprising means for advancing a mandrel at a predetermined rate of speed, rotatable coiling means for rotating about the advancing mandrel and at a predetermined rate a bobbin of the wire to be wound as a helix about such mandrel, wire feeding means for directing the wire wound from the bobbin onto the advancing mandrel, and a heating means for heating the wire as it is wound onto the advancing mandrel, the improvement which comprises:
  • adjustable power supply means for energizing said magnetic field generating means to set at a predetermined value the power consumed by said heating means; whereby the amount which the wire is heated on being wound is carefully controlled.
  • electromagnetic coil means energized by first power supply means and having spaced pole pieces between which is generated a magnetic field, said pole pieces spaced on either side of said rotatable disc means to generate therein eddy currents and a drag force which acts against the rotation of said bobbin;
  • said first power supply means being adjustable to set at a predetermined value the drag force on said disc means and said connected bobbin to prevent free rotation thereof;
  • said heating means comprising a resistive load References Cited by the Examiner connected across the output terminals of said arma- UNITED STATES PATENTS g f fif i 0 d W 1 s f en r 1,855,876 4/1932 Barker 72--66 g S g g 2 e 5 2,163,565 6/1939 Thomas 72--66 glzln sal ma netlc e eneratmg means to set 2,667,204 1/1954 Jaycox H at a predetermined value the power consumed by said heating means to carefully control the amount CHARLES LANHAM, Pnmmy Examine"- which the wire is heated on being wound.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Coil Winding Methods And Apparatuses (AREA)
  • Wire Processing (AREA)
US346297A 1964-02-20 1964-02-20 Lamp filament winding machine Expired - Lifetime US3315508A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US346297A US3315508A (en) 1964-02-20 1964-02-20 Lamp filament winding machine
GB53033/64A GB1031340A (en) 1964-02-20 1964-12-31 Lamp filament winding machine
NL6500335A NL6500335A (de) 1964-02-20 1965-01-12
FR6093A FR1424924A (fr) 1964-02-20 1965-02-18 Boudineuse pour filaments de lampes
BE660011A BE660011A (de) 1964-02-20 1965-02-19

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US346297A US3315508A (en) 1964-02-20 1964-02-20 Lamp filament winding machine

Publications (1)

Publication Number Publication Date
US3315508A true US3315508A (en) 1967-04-25

Family

ID=23358778

Family Applications (1)

Application Number Title Priority Date Filing Date
US346297A Expired - Lifetime US3315508A (en) 1964-02-20 1964-02-20 Lamp filament winding machine

Country Status (4)

Country Link
US (1) US3315508A (de)
BE (1) BE660011A (de)
GB (1) GB1031340A (de)
NL (1) NL6500335A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3493017A (en) * 1966-01-27 1970-02-03 Philips Corp Method and apparatus for winding filaments for electric incandescent lamps,discharge tubes or the like
US3515176A (en) * 1967-06-02 1970-06-02 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Coil winding machines
DE2350399A1 (de) * 1973-10-08 1975-04-17 Radium Elektrizitaets Ges Mbh Wickelmaschine fuer wendelgluehkoerper elektrischer lampen
US3916959A (en) * 1974-05-02 1975-11-04 Mikhail Alexeevish Konin Device for initial colling of filament on filament core
US4041683A (en) * 1975-01-07 1977-08-16 Gluhlampenfabrik A.G. Machine for coiling lamp filaments
CN112453270A (zh) * 2019-09-06 2021-03-09 张欣 自动绕丝装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1855876A (en) * 1929-03-21 1932-04-26 Western Electric Co Method of and apparatus for producing electrical resistance elements
US2163565A (en) * 1938-10-12 1939-06-20 Hygrade Sylvania Corp Apparatus for filament coiling
US2667204A (en) * 1952-03-29 1954-01-26 Westinghouse Electric Corp Coiling head assembly

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1855876A (en) * 1929-03-21 1932-04-26 Western Electric Co Method of and apparatus for producing electrical resistance elements
US2163565A (en) * 1938-10-12 1939-06-20 Hygrade Sylvania Corp Apparatus for filament coiling
US2667204A (en) * 1952-03-29 1954-01-26 Westinghouse Electric Corp Coiling head assembly

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3493017A (en) * 1966-01-27 1970-02-03 Philips Corp Method and apparatus for winding filaments for electric incandescent lamps,discharge tubes or the like
US3515176A (en) * 1967-06-02 1970-06-02 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Coil winding machines
DE2350399A1 (de) * 1973-10-08 1975-04-17 Radium Elektrizitaets Ges Mbh Wickelmaschine fuer wendelgluehkoerper elektrischer lampen
US3916959A (en) * 1974-05-02 1975-11-04 Mikhail Alexeevish Konin Device for initial colling of filament on filament core
US4041683A (en) * 1975-01-07 1977-08-16 Gluhlampenfabrik A.G. Machine for coiling lamp filaments
CN112453270A (zh) * 2019-09-06 2021-03-09 张欣 自动绕丝装置

Also Published As

Publication number Publication date
NL6500335A (de) 1965-08-23
GB1031340A (en) 1966-06-02
BE660011A (de) 1965-06-16

Similar Documents

Publication Publication Date Title
US2317290A (en) Winding apparatus
US3785140A (en) Device for winding threads, particularly textile threads
US2365691A (en) Apparatus for advancing filamentary material
US3113746A (en) Strand tension control apparatus
US4650132A (en) Method of using a controlled magnetic bearing arrangement in a textile winding device and textile winding device for use with spinning machines and equipped with such controlled magnetic bearing arrangement
US2179334A (en) Magnet wire insulating machinery
US3315508A (en) Lamp filament winding machine
US2233060A (en) Combined clutch and brake
US3581060A (en) Temperature control device in a heated galette
US2277134A (en) Brake
US5506460A (en) Precision drive system for independently driven coaxial shafts, particularly to make coiled electric lamp filaments
US3022025A (en) Tension control for filamentary materials
US2534496A (en) Constant tension elongated material handling mechanism
US3053474A (en) Tension control device
GB189905A (en) Improvements in and relating to electric devices for controlling the rotation of bobbins during winding thereon or therefrom
US3441702A (en) Method and apparatus for heating thread-like products
US2845235A (en) Electromagnetic wire tension device
US1996450A (en) Bobbin drag device for wrapping machines and the like
US2296959A (en) Winding machine
US2748299A (en) Automatic torque controller
US3282037A (en) Apparatus for detecting a substantially depleted or missing binder thread condition
US1855876A (en) Method of and apparatus for producing electrical resistance elements
US3117742A (en) Variable torque brake for a winding reel
US1981133A (en) Material handling apparatus
US2668019A (en) Strand tension control mechanism

Legal Events

Date Code Title Description
AS Assignment

Owner name: NORTH AMERICAN PHILIPS ELECTRIC CORP.

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:WESTINGHOUSE ELECTRIC CORPORATION;REEL/FRAME:004113/0393

Effective date: 19830316