US3301496A

US3301496A - Yarn winding machine

Info

Publication number: US3301496A
Application number: US353693A
Authority: US
Inventors: Furst Stefan
Original assignee: Individual
Current assignee: Individual
Priority date: 1963-03-22
Filing date: 1964-03-23
Publication date: 1967-01-31
Anticipated expiration: 1984-01-31
Also published as: GB1063778A

Description

Jan. 3 l, 1967 s. FURST YARN WINDING MACHINE 2 Sheets-Sheet 1 Filed March 23, 1964 Jan.3l, 1967 s. FURST 3,301,496

7 YARN WINDING MACHINE Filed March 25, 1964 2 Sheets-Sheet 2 a 3T a i 35 A I I I -r- FY? 33 /0-// United States Patent C) 3,301,496 YARN WINDING MACHINE Stefan Furst, Monchen-Gladbach, Germany, assignor to Waiter Reiners, Monchen-Gladbach, Germany Filed Mar. 23, 1964, Ser. No. 353,693 Claims priority, application Germany, Mar. 22, 1963, R 34 9 12 Claims. (or. 24z s7 the rotating wound package or take-up spool is braked in order to repair the yarn break or substitute a new supply coil, respectively, and is driven in the opposite direction for a short time in order to seize the broken yarn end with a suction device and thereafter to knot that end with the other end of the broken yarn or of the new supply coil, as the case may be.

There are various possible ways of braking and of reversing the rotation of the take-up spool. Either the rotating yarn-guiding drum for the take-up spool is braked and oppositely rotated for a short time so that the take-up spool follows this reversed rotation due to frictional engagement therewith, or the position of the take-up spool is altered in such a manner that it is transferred from frictional engagement with the forwardly rotating yarn-guiding drum directly to a reversely rotating roller or first'intermediately to a stationary braking member. Independently of whether the take-up spool is transferred directly to the oppositely rotating roller or first transferred to a stationary braking member, in either case, there arises the disadvantage that the upper surface of the take-up spool is damaged because of friction when it runs up against the stationary member or even more so when it comes into contact with the roller rotating in the opposite direction. a

It is accordingly an object of my invention to provide a winding machine which avoids the aforementioned disadvantages of the known machines and, particularly, damage to the yarn of the take-up spool due to friction.

To this end and in accordance with a feature of my invention, I provide a yarn winding machine with braking and/or oppositely rotating rolls having a friction clutch or brake. In accordance with another aspect of my invention, the friction value of the friction clutch is made adjustable. The friction value of the clutch is selected so that the braking moment of the stationary or oppositely rotating rollers against the clutch is somewhat after only a slight sliding or slippage at the take-up spool surface. Thus the yarn surface essentially'rolls up on the braking or counter-rotating member, since with the exception of the slippage in the first moment of engagement until the roller is accelerated to the rotational speed of the take-up spool, the sliding friction is absorbed in suitable wear-resistant elements. The friction between the take-up spool and the roller is proportional to the weight or diameter of the take-up spool. In order to ice make allowance for this friction, the friction value of the friction clutch is adjustable in accordance with the weight or diameter of the spool. It is a relatively simple matter to apply my invention to winding machines of the type in which the pressure of the take-up spool against the roller is maintained at constant value independently of the weight of the spool.

Other features which are considered as characteristic for the invention are set forth in the appended claims.

Although the invention has been illustrated and described as embodied in a yarn-winding machine, it is nevertheless not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalence of the claims.

The construction and method of operation of the invention, however, together with additional objects and advantages thereof will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings, in which:

FIG. 1 is a partly diagrammatic side elevational view of a yarn-winding machine station according to the invention, some of the components being omitted for the purpose of clarity;

FIG. 2 is a fragmentary plan view, partly in section, of several coacting components of the machine shown in FIG. 1;

FIG. 3 is a graph showing the relationship of the peripheral speed of the take-up spool to the duration of braking when the braking member is not provided with a clutch;

FIG. 4 is a graph showing the peripheral speed of the braking roller which is provided with a clutch in accordance with my invention with respect to the duration of braking and its relationship to the peripheral speed of the take-up spool during the same period; and

FIG. 5 is a circuit diagram showing the electrical connections between the yarn guard or feeler and the take-up spool braking mechanism.

"is also provided which, in the case shown in FIG. 1,

swings out when the yarn is broken or the supply coil 1 is depleted and connects the electrical circuit to a power source 8 by means of the contacts 6, 7 so that a motor 9 is energized to drive the cam 12 in the direction of the arrow through the agency of the meshing gear pair 10, 11. A rotary switch mechanism shown in FIG. 5, is provided on the shaft 11a of the gear 11 or the cam 12 to shut off the motor 9 after a single turn of the gear 11 on the cam 12. As shown in FIG. 1, the lever or follower arm 13a of a bell-crank or double-arm lever slides on the peripheral surface of the cam 12 and when the bell-crank lever swings about the shaft 14, the other lever arm 13b thereof swings the take-up spool 4 by means of the arm 15,- which is secured to the shaft on which the take-up spool is mounted, from the broken-line position of the take-up spool to the solid-line position in which it engages the braking roller 16. When the rotary speed of the take-up spool 4 has been slowed almost to zero, then the cam 12 causes the lever arms 13a, 13b again to swing slightly in a clockwise direction so that the take-up spool 4 comes into contact with the roller 18 which is rotating in the opposite direction. When the rotary direction of the take-up spool 4 is reversed, the yarn from the surface of-the take-up spool'4 is unwound slightly and can be gripped by means of a vacuum nozzle 17, shown only fragmentarily in FIG. 1 to avoid obscuring other details. A representative vacuum nozzle yarn seizing device of this general type is shown in my Patent No. 3,077,312. All of therelatively stationary components, for example the mounting peg of the supply coil or cop 1, the yarn tension'er 2, the shaft of the yarn guard 5, the yarn guide drum 3, the counter-rotating roller 18 as well as the shafts 11a, 14, 21 and the motor 9 are mounted in a suitable manner on the winding machine frame 19 in substantially similar relationship to each other as that shown in my Patent Nos. 3,003,478 and 3,092,340.

In order to avoid large frictional losses between the take-up spool 4 and the braking roller 16, the roller has a hollow construction and is consequently of relatively small mass, for example as shown in FIG. 2. The surface 20 of the roller 16 comes into contact with the take-up spool 4 and is freely rotatable on the bearings 20a and 201; about the shaft 21 which is suitably mounted on the frame 19. The bearing 20a is supported against a fixed abutment 22 connected to the shaft 21, while the bearing 20]) faces a counter bearing 23 which, though connected with the shaft 21 is nevertheless axially displaceable thereon by the well-known pin and groove arrangement such as is illustrated in FIG. 2. This counter bearing 23 is biased into engagement with the bearing 20b bymeans of a compression spring 24 and a set collar or adjusting ring 25.

When the take-up spool 4 is transferred into engagement with the surface 20 of the braking roller 16, the latter is first of all taken along or entrained therewith so that sliding occurs between the bearings 20a and 20b on the one hand and the counter bearings or abutments 22 and 23 on the other hand. The amount of backlash or .sliding depends upon the frictional force which exists between the components 20a and 22 or 20b and 23. This frictional force can be adjusted with the adjusting ring 25. After sliding between the components 20a and 22 as well as 20b and23 has ceased, the roller 20 and and shaft 21 act together as a rotating unit.

The frictional force can be adjusted by hand, and it is possible to lock the adjusting ring 25, for example, with a tightened screw (not shown) on the shaft 21. It is, however, also possible to automatically alter the position of the adjusting ring 25 and thereby the amount of frictional force between the roller bearings 20a, 20b and the abutments 22, 23, respectively, in proportion to the di ameter of the wound take-up spool 4. In the embodiment shown in FIGS. 1 and 2, there is provided a flexible adjusting member or Bowden wire whose tubular sheath 26 is secured at one end to a curved arm 130 of the bell crank lever 13a, 13b and at the other end to an arm 27 fixed to the shaft 14. The position of the flexible wire push-pull member 26a, connected at one end to the lever arm 28a and at the other end to the spool-carrying arm 15, within the sheath of the Bowden wire 26 depends upon the location of the arm 15. The more fully wound the take-up spool 4, the farther will the member 26a extend from the arm 15 into the tubular adjusting member 26 and exert pressure on the arm 28a of the double lever 28a, 28b and cause it to pivot clockwise as viewed in FIG. '2. The arm 28b of this double lever then presses against the adjusting ring 25, if necessary through the intermedi- :ary of a compression bearing (not shown), so that the spring 24 is placed under greater compression, the larger the diameter of the take-up spool 4. The frictional force :for braking the surfaceztl of the roller 16 thereby also varies with the diameter of the take-up spool 4.

FIG. 3 shows a graph in which the peripheral speed v of the take-up spool decreases gradually to zero during the braking interval t. The entire hatched area represents backlash or sliding at the yarn surface of the take-up spool which occurs due to the fact that the braking roller is not provided with a clutch for reducing the sliding friction.

In FIG. 4 there is shown the relationship of the peripheral speed v to the time t of braking, in. which the curve Sp represents the peripheral speed of the take-up spool 4 and the curve R represents the peripheral speed of the roller 16. Immediately after instituting the braking action the rotational speed of the braking roller which is provided with a clutch in accordance with my invention, increases to at least approximately the speed of the take-up spool and then either together with the spool or with a very slight mutual sliding, is slowed down with the spool to a speed of zero. The sliding between the take-up spool 4 and the braking roller 16 occurring in this case is only the relatively smaller hatched area of FIG. 4 as compared to FIG. 3. Since the braking moment of the friction clutch is somewhat smaller than the braking moment resulting from the peripheral friction between the take-up spool and the braking roller, the braking curve in its entirety follows a slightly flatter course so that, as is shown in FIG. 4, the braking process consumes a longer period of time.

Although the clutch has been described herein as a friction clutch, other types of clutches such as a magnetic clutch for example, are intended to be and are included within the scope of my invention.

Furthermore, the clutch can be provided for the counterrotating roller 18 in the same manner instead of, or in addition to, being provided for the roller 16.

In my Patents Nos. 3,033,478 and 3,092,340, I describe a winding machine in which a yarn take-up spool is rotated in one direction and then oppositely rotated indirectly through the yarn guide drum by means of an intermediate friction roller or idler which is pivotable into engagement simultaneously with the yarn guide drum and with the one and then the other of the counterrotating rollers. In the present invention, on the other hand, the take-up spool 4 is rotated in a forward direction only by the yarn guide drum 3 which is independently rotated clockwise, as shown in FIG. 1, by any suitable means, and is directly placed in engagement successively with the braking roller. 16 and the counter-rotating roller 18.

In my aforementioned Patent No. 3,033,478, -I have provided a completely mechanical device for effecting a single turn of the cam so that the take-up spool is rotated in reverse to permit the yarn end to be seized. Such a device can, of course, also be employed in the present invention for causing the take-up spool 4 to engage the counter-rotating roller 18 so as to reverse its rotation during one turn of the cam 12.

In the embodiment of this invention, however, I utilize an electromechanical device for effecting the single turn. As shown diagrammatically in FIG. 5, alternating current from a main power line is stepped down by the transformer 8a and converted to direct current by the rectifier '8. Upon the breakage of yarn or depletion of the supply coil 1, the yarn guard or feeler 5 swings outwardly and closes the contacts 6, 7, applying voltage to a coil 31 of a relay CR which actuates the contacts 32, 3-3 to close the circuit that energizes the motor 9 from the main power line. Simultaneously therewith, a self-holding contact 34 is closed. As the motor 9 begins to rotate the control cam 12 (FIG. 1), a switching cam 12a of the single-turn mechanism, suitably mounted for example coaxially with the control cam 12, opens a contact 36 and closes a contact 37. The yarn guard contacts 6, 7 are now rendered inactive, and the relay coil 31 remains energized until the single turn is completed. Then the cam 12a opens contact 37 and closes contact 36 thereby interrupting the self-holding circuit of relay CR so that the motor stops.

I claim:

1. In a yarn winding machine, a rotating take-up spool, braking roller means, means for bringing said rotating take-up spool and said braking roller means into mutual engagement so as to brake said rotating take-up spool, and clutch means cooperating with said braking roller means for reducing sliding friction between said take-up spool and said braking roller means.

2. In a yarn winding machine, a rotating take-up spool, bra-king roller means, means for bringing said rotating take-up spool and said braking roller means into mutual engagement so as to brake said rotating take-up spool, and friction clutch means frictionally engaging said braking roller means for reducing sliding friction between said take-up spool and said braking roller means.

3. In a yarn winding machine, a rotating take-up spool, braking roller means, means for bringing said rotating take-up spool and said braking roller means into mutual engagement so as to brake said rotating take-up spool, friction clutch means frictionally engaging said braking roller means for reducing sliding friction between said take-up spool and said braking roller means, and means for adjusting the frictional force between said clutch and said braking roller means.

4. In a yarn Winding machine, a rotating take-up spool, braking roller means, means for bringing said rotating take up spool and said braking roller means into mutual engagement so .as to brake said rotating take-up spool, friction clutch means frictionally engaging said braking roller means for reducing sliding friction between said take-up spool and said braking roller means, and means for adjusting the frictional force between said clutch and said braking roller means in proportion to the weight of said take-up spool.

5. In a yarn winding machine, a rotating takeaup spool, braking roller means, means for bringing said rotating take-up spool and said braking roller means into mutual engagement so as to brake said rotating take-up spool, friction clutch means friction-ally engaging said braking roller means for reducing sliding friction between said take-up spool and said braking roller means, and means for adjusting the frictional force between said clutch and said braking roller means relative to the diameter of said take-up spool.

6. In a yarn Winding machine, a rotating take-up spool, a stationary idler roller spaced from said rotating take-up spool, means for bringing said rotating take-up spool and said idler roller into mutual engagement so as to brake said rotating take-up spool, and clutch means cooperating with said idler roller for reducing sliding friction between said take-up spool and said idler roller.

7. In a yarn winding machine, a rotating take-up spool, braking roller means comprising a stationary idler roller and a counter-rotating roller rotating in the same rotary direction as said rotating take-up spool, said rollers being spaced from one another and from said rotating take-up spool, means for bringing said rotating take-up spool into successive mutual engagement with said rollers so as to brake said rotating take-up spool and reverse its direction of rotation, and clutch means cooperating with at least one of said rollers for reducing sliding friction between said take-up spool and said one roller.

'8. In a yarn winding machine, a rotating take-up spool, braking roller means including means for reversing the rotary direction of said take-up spool spaced therefrom, means for bringing said rotating take-up spool and said braking roller means into mutual engagement so as to brake said rotating take-up spool and reverse its rotary direction, and clutch means cooperating with said braking roller means for reducing sliding friction between said take-up spool and said braking roller means.

9. In a yarn winding machine, a freely rotating take-up spool, braking roller means comprising a shaft, a stationary idler roller mounted on said shaft and freely rotatable with respect to said shaft, means for bringing said rotating take-up spool and said idler roller into mutual engagement whereby said idler roller is entrained by said rotating take-up spool and is rotated about said shaft so as to brake said rotating take-up spool, and clutch means comprising at least one abutment member mounted on said shaft, said abutment member being frictionally engageable with said idler roller so as to reduce sliding friction between said take-up spool and said idler roller.

10. A yarn winding machine according to claim 9 including means for adjusting the frictional force between said abutment member and said roller.

11. A yarn winding machine according to claim 10, wherein said adjusting means comprises a compression spring biasing said abutment member into engagement with said idler roller and a linkage system applying pressure to said spring for varying the biasing force of said spring in relation to the diameter of said take-up spool.

12. A yarn winding machine according to claim 10 wherein said braking roller means includes a counterrotating roller spaced from said idler roller and said take-up spool, said means for bringing said take-up spool and said idler roller into mutual engagement comprising a single-turn mechanism including a cam, means for giving said cam a single turn and follower means operatively connected to said take-up spool, said follower means being guided by said cam to operatively bring said take-up spool into engagement with said counter-rotating roller for reversing the original direction of rotation of said take-up spool during a single turn of said cam.

References Cited by the Examiner UNITED STATES PATENTS 474,381 5/ L892 Hagadorn et a1 242-455 594,688 11/ 1897 Gue et al. '1 8825 2,992,785 7/1961 Pitts 242--35.6 3,081,046 3/ 1963 Barnes et al 242-86 STANLEY N. GILREATH, Primary Examiner.

MERVIN STEIN, W. S. BURDEN,

Assistant Examiners.