US3375992A

US3375992A - Apparatus for the beaming and winding of thread bolts and material webs

Info

Publication number: US3375992A
Application number: US525245A
Authority: US
Inventors: Garske Friedrich
Original assignee: Bemberg AG
Current assignee: JP Bemberg AG; Bemberg AG
Priority date: 1965-02-04
Filing date: 1966-02-04
Publication date: 1968-04-02
Anticipated expiration: 1985-04-02
Also published as: CH432407A; NL6601411A; DE1535152A1; BE675873A; AT267001B; GB1133730A

Description

April 2, 1968 F. GARSKE 3,375,992

APPARATUS FOR THE BEAMING AND WINDING OF THREAD BQLTS AND MATERIAL WEBS Filed Feb. 4, 1966 4 Sheets-Sheet 1 FIG! I l4 2s 26 .\i I? I 0 l8 I I6 22 2| TRANSFORMER 1 R I MP I 27 l i dsz 3|\ T *1 VOLTAGE VARIATIONY ,30

INVENTOR:

FRIEDRICH GARSKE Mag M aka ATT'YS April 2, 1968 F. GARSKE 3,375,992

APPARATUS FOR THE BEAMING AND WINDING OF THREAD BOLTS AND MATERIAL WEBS Filed Feb. 4, 1966 4 Sheets-Sheet F3 AMPLVIFIER 42 VOLTAGE VARIATION INVENTOR. L Rl E DRICH GARSKE ATT'YS April 2, 1968 Filed Feb. 4, 1966 l I 1 //l H m K2 I l l F APPARATUS FOR THE BEAMING AND WINDING OF GARSKE 3,375,992

THREAD BOLTS AND MATERIAL WEBS 4 Sheets-Sheet I5 INVENTOR: FRIEDRICH GARSKE April 2, 1968 F. GARSKE 3,375,992

APPARATUS FOR THE BEAMING AND WINDING OF THREAD BOLTS AND MATERIAL WEBS Filed Feb. 4, 1966 4 Sheets-Sheet 4 F RIEDRICH GARSKE United States Patent Ofilice 3,375,992 Patented Apr. 2, 1968 3,375,992 l APPARATUS FOR THE BEAMING AND WINDING F THREAD BOLTS AND MATERIAL WEBS Friedrich Garske, WnppertaLOberbarrnen, Germany, 'assigner to J. P. Bemberg Aktiengesellschaft, Wuppertal- Oberbarmen, Germany Filed Feb. 4, 1966, Ser. No. 525,245 Claims priority, application Germany, Feb. 4, 1965,

Claims. (63242-7551) ABSTRACT OF THE DISCLOSURE Winding and unwinding of thread bolts and material webs in which a constant thread tension is maintained utilizing two motors or motor groups which are coupled to one another in such a way that the turning speed difference produced from the speed of the thread bolt between the drive part of a coupling and the driven part of the coupling is kept Within the limits in which the coupling presents a range of constant or approximately constant torque.

The present invention relates to a process for the beaming and winding of thread bolts and material Webs in which the winding mechanism is driven by a motor controllable in its rate of revolution and the unwinding mechanism is braked with variable moment.

In checking thread purity or for the production of relatively large warp or weaving beams from several smaller ones it is important for reasons of quality that the thread tension be maintained as constant as possible in all operating states independent of the draw-off speed and winding diameter. For this problem various solutions have been proposed.

The known solutions are all very complicated and subject to breakdown and, moreover, are expensive. Additionally, most of them are not capable of assuring a really faultless thread tension course, since in all cases only the actually occurring tension or velocity fluctuations supply the adjusting magnitudes for the regulation, and, there fore, also belong to the system and are unavoidable.

The general technical problem basic to the present invention consists accordingly in finding a process for the rewinding and winding of thread bolts and material webs which, at all winding speeds, and in particular at very low speeds as well as at standstill, guarantees a constant thread pull with changing diameters of the material carriers and, furthermore, when the drive is switched off, holds the threads taut. The special technical problem also lies in providing a simple process and one assuring low susceptibility to breakdowns.

While any coupling having the mentioned characteristics may, of course, be employed, eddy-current couplings, Whose torque is in general dependent on the turning rate difference and the strength of the exciter current appear to be well suited for use in most cases. Especially advantageous are those devices whose character istic curve shows, in the desired range of eflective turn ing rate difference in the coupling, for the transmitted torque, dependence only on or practically only on the eXciter current.

According to the invention the motors or motor groups are coupled with one another in such a way that the turning speed difference between the driving and driven parts of the coupling is kept within a range of constant or approximately constant torque, independent of minor fluctuations in the turning rate dilference. If the exciter current is varied in dependence on the winding diameters, then constant thread tension may be attained during the entire winding process. The speeds of the two motors or motor groups can be attuned in such a way thatwith suitable choice of the coupling characteristic curvethe brake motor stands at the highest winding speed (turning rate), but for the maintenance of the torque is supplied with a corresponding rest current, while with the winding motor at a standstill the brake motor turns at maximum speed and thus also in this operative state maintains the desired thread tension. It is possible, for example, for both motors or motor groups to be provided with current by way of a voltage divider, so that the voltages on the two groups are dependent upon one another in a simple relationship.

By adjusting the coupling excitation or the guide blade setting, it is possible to balance out the influences which arise from the changing diameters both directly with respect to the torque to be provided for equal thread tension and also through the change of the differential turning rate in the slip coupling. It is also possible to regulate brake motor speed as a function of Winding speed; but diameter changes likewise enter into the regulating process in such a way that the diflerential turning rate in the slip coupling remains constant or approximately constant. This tends to happen especially in the case of meet one of the eddy-current couplings only when the range of the torque independent of the differential turning rate change is departed from. Within this range it is sufiicient for the attainment of constant thread tension (or of the desired thread tension course) if the excitercurrent of the coupling is varied only in dependence on the diameter of the running-oil, that is, of the braked part.

The invention can best be understood by referring to the attached drawing in which:

FIGURE 1 shows a schematic circuit diagram of the oppositely directed turning rate control making use of a voltage divider;

FIGURE 2 shows the appertaining diagram of the voltage course for the drive motor and the brake motor;

FIGURE 3 shows a rewinding (beaming) drive similar to FIG. 1 with current supply over magnetic amp1ifiers or controllable Si-thyratrons;

FIGURE 4 shows the diagram of the appertaining voltage course;

FIGURE 5 shows the basic circuit diagram of a drive for warping machines with direct current shunt Wound motors which are fed over magnetic amplifiers;

FIGURE 6 shows the basic circuit diagram of a warping machine drive with three-phase current commutator machines and mechanical shaft for the brake coupling; and

FIGURE 7 shows the torque characteristics of an especially well-suited eddy-current coupling.

As is shown in FIG. 1, the winding part 1 is driven by motor 4. An electromagnetically actuated braking means 2, 3, which becomes active when the machine is shut off, is connected with the drive shaft. The unwinding part 5 is driven by motor 9 over the interposed slip coupling 8, in the present case an eddy-current coupling. Braking means 6, 7 is connected with the shaft, between the slip coupling 8 and the unwinding part. The exciter current of slip coupling 8 is varied by the regulating

resistor

10, 13. The adjustable slide contact 13 is connected by lever 11 with a sensing roller 12, which senses the thickness of the unwinding part. Both motors 4 and 9 are directcurrent shunt motors which are energised through two

rectifiers

19 and 20, said motors having shunt field Windings 23 and 24. The current supply comprises a transformer 15 with

movable middle tap

16, 26. The shifting of the tap (take-oil) is done by means of a shifting motor 14, in such a way that movement of the tap in the direction of arrow 17 increases winding speed], while movement in the direction of arrow 18 reduces winding speed.

The movements of the

voltage tap

16, 26 are limited so that, in both end positions, a

residual voltage

31, 32 is provided, in each case for the motor energised at the lower voltage. This is necessary so that the torque necessary for the maintenance of the thread tension will be applied. A conventional current limiter 25 for starting purposes is installed in the supply line for the brake motor 9. The current-main voltage is applied at 21 and 22. The slip coupling 8 can include stationary adjustable guide blades of the usual type and an additional control device 12 is connected with the adjusting device for the guide blades.

The voltage variation can be clearly seen from FIG. 2, wherein the straight line 27 shows the voltage between 26 and 22, while the straight line 28 shows the voltage between 26 and 21. The

lateral limits

29 and 30 correspond to the end positions of the voltage tap 16.

Numbers

31 and 32 indicate the standstill voltages for the two motors 9 and 4. The turning rates of the two motors vary according to the known turning rate equation:

wherein 1 is armature current, R is resistance, C is capacitance, i is magnetic flux, and U is revolutions.

On switching ofi' of the drive the two braking means 2, 3 and 6, 7 securely hold the warp beams in order to prevent slacking of the thread. It is expedient to arrange a time lag between the starting of the motor 9, when the slip coupling 8 goes into action, and the release of the braking unit 6, 7, so that unit 6, 7 is released only when motor 9 and slip coupling 8 have reached their starting speed of revolution.

FIG. 3 likewise shows winding part 1 with drive motor 4 and braking means 2, 3, and an unwinding part with drive motor 9, slip coupling 8 and braking unit 6, 7. In addition to the alteration of the excitation as represented in FIG. 1 for the eddy-current coupling 8 there is here arranged a potentiometer 37, with the aid of which, for example, the optimal thread tension can be set in, generally difierent with differing denier. In the current circuit of motor 4 there is arranged, moreover, a potentiometer 33, on which tap 34 controlled over feeler roller 36 in dependence on the diameter of the winding part acts in such a way that the winding speed remains constant. The control of the two motors takes place in a manner known per se over magnetic amplifiers or silicon controlled

thyratron power amplifiers

39, 41 together with the common control set 40. The apparatus is dimensioned in such a way that the desired voltage course is achieved in both machines. The

curves

44 and 45 in FIG. 4 show the voltage course for the motors 4 and 9. Over the potentiometer 33 it is possible to influence either the control set 40 or the two

fields

23 and 24.

FIG. 5 shows the theoretical circuit diagram of a drive for warping machines. The run-off beams 5 arranged one behind the other are connected over eddy-current couplings S with drive motors 9, which lie in parallel on the output voltage of the power (output) amplifier 39. Otherwise, the circuit is built up as in FIG. 3.

FIG. 6 shows a variation of the drive for warping machines with two three-phase current commutator motors as drive machines, in which for all the unwinding parts in common there is present a brake motor 47, which drives the eddy-current couplings by means of a shaft 50, over bevel wheel gears 51, 52. The brake motor is a threephase current commutator motor the speed of which is controllable, for example, through brush cross shifting. A second three-phase current commutator motor drives the winding part, The speeds of the two machines are varied by a common shifting gear 48 proportionally and oppositely. Starting resistors 49 serve in the usual manner to limit the starting current.

Instead of the two three-phase

current commutator machines

46 and 47 it is also possible to use short-circuit rotor motors with an infinitely adjustable gear between motor and driven or braked part. There the infinitely shiftable gears must be arranged in such a way that the output turning rates automatically vary oppositely. In using short-circuit rotor motors it is also possible to employ socalled static frequency transformers, in which the turning rate can be regulated by continuous shifting of the output frequency.

FIG. 7 shows the characteristic torque diagram of an especially Well-suited eddy-current slip coupling, in which the torque transmitted in each case at a certain exciter current strength is plotted in dependence on the effective differential turning rate or the slip. With the choice of the working range within the horizontal part of the curve bundle limited by 53 and 54 there sufiices a relatively rough adaptation of the turning speed of the brake motor to that of the winding motors, just so long as care is taken that the actual effective turning rate difference remains within the range 53, 54.

Obviously many modifications and variations of the invention as hereinbetore set forth may be made without departing from the spirit and scope thereof, and therefore only such limitations should be imposed as are indicated in the appended claims.

I claim:

1. Apparatus for beaming and rewinding comprising the combination, with an unwinding reel and a rewinding reel, of variable speed motors drivingly connected respectively with the rewinding and unwinding reels, a slip coupling interconnecting the unwinding reel with its driving motor, means for varying the slippage of said coupling as a function of the amount of material on the unwinding reel, and voltage means comprising a winding having a shiftable tap, the movement of which is limited, in each of its opposite end positions of adjustment to apply a standstill potential on the motors sufiicient to maintain a desired thread tension.

2. Apparatus for beaming and rewinding comprising the combination, with an unwinding reel and a rewinding reel, of variable speed motors drivingly connected respectively with the rewinding and unwinding reels, a slip coupling interconnecting the unwinding reel with its driving motor, means for varying the slippage of said coupling as a function of the amount of material on the unwinding reel, a power amplifier for energising each motor, a common control set associated with said amplifiers for increasing the voltage on one motor while correspondingly decreasing voltage on the other, and vice versa.

3. Apparatus as set forth in claim 2, wherein the power amplifiers are magnetic.

4. Apparatus as set forth in claim 2, wherein the amplifiers are silicon-controlled thyratrons.

5. Apparatus as set forth in claim 2, including means for varying the speed of the motors as a function of the amount of material on the rewinding reel.

References (Cited UNITED STATES PATENTS 2,365,691 12/1944 Fodor 242-7551 3,061,228 10/1962 Andrade 242--75.51

FOREIGN PATENTS 218,036 8/1958 Australia.

STANLEY N. GILREATH, Primary Examiner,