Claims
- 1. Apparatus for taking-up an advancing nascent filament from a rotating quench surface at a substantially constant speed, comprising:
- (a) a winding reel which has a reel core and is in rotative communication with a synchronous-hysteresis electrical motor having a substantially constant pull-down torque characteristic; and
- (b) selection means for adjusting the voltage input to said motor to select winding torque and for adjusting the frequency input to said motor to select a rotational velocity of said motor which at synchronous condition provide a reel core peripheral velocity that is about 2% less than the peripheral velocity of said quench surface, said voltage and frequency being adjusted to operate said motor in its pull-down mode while said filament is being taken up on said reel, thereby providing said substantially constant filament take-up speed without a dramatic tension increase on the filament during pull-down.
- 2. Apparatus, as in claim 1, wherein the moment of inertia of said motor is substantially less than the moment of inertia of said reel with a full winding of said filament.
- 3. Apparatus, as in claim 1, further comprising:
- (c) cut-and-grip means for simultaneously cutting and securing said advancing filament at the core of said winding reel.
- 4. Apparatus, as in claim 3, wherein said filament has high tensile stiffness relative to the winding tension exerted by said winding torque.
- 5. A method for taking up an advancing nascent filament from a rotating quench surface at substantially constant speed onto a winder having a winding reel which has a reel core driven by a synchronous-hysteresis electrical motor, comprising:
- (a) adjusting the voltage input to said motor to select winding torque;
- (b) adjusting the frequency input to said motor to select a rotational speed of said winding reel which at synchronous condition provides a reel core peripheral velocity that is about 2% less than the peripheral velocity of said quench surface;
- (c) selecting said voltage and frequency inputs to operate said motor in its pull-down mode while said filament is being taken up on said reel to provide said substantially constant filament take-up speed without a dramatic tension increase on the filament during pull-down;
- (d) securing said advancing filament to the core of said winding reel, whereupon in-line winding of said advancing filament proceeds.
- 6. A method, as in claim 5, wherein the moment of inertia of said motor is substantially less than the moment of inertia of said reel with a full winding of said filament.
Parent Case Info
This is a continuation of application Ser. No. 067,088 filed Aug. 16, 1979, now abandoned.
US Referenced Citations (12)
Foreign Referenced Citations (2)
Number |
Date |
Country |
2729303 |
Jan 1979 |
DEX |
1380550 |
Oct 1964 |
FRX |
Non-Patent Literature Citations (2)
Entry |
Noodleman, S., Torque Motors and Brakes, Reprinted from Product Engineering, Apr., 1957. |
Graham Company, AC Adjustable Frequency Drive, Sep., 1978. |
Continuations (1)
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Number |
Date |
Country |
Parent |
067088 |
Aug 1979 |
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