US2685726A - Device for swinging the warp beam of warping machines into and out of working position - Google Patents

Description

1954 s. FURST DEVICE FOR SWINGING THE WARP BEAM OF WARPING MACHINES INTO AND OUT OF WORKING POSITION Filed Nov. 18, 1949 IN V EN TOR.

STEFAN F8257: BY

ATTOR/VEKF.

wheel is forced against Patented Aug. 10, 1954 DEVICE FOR SWINGING THE WARP BEAM OF WARPING MACHINES INTO AND OUT OF WORKING POSITION Stefan Fiirst, Munchcnsigner to Walter Rei rhein) Germany Gladbach, Germany, asners, Waldniel (Nieder- Application November 18, 1949, Serial No. 128,128

Claims priority, application Germany July 26, 1949 4 Claims. 1

My invention relates to a device for swinging the warp beam of warp winding machines into and out of working position.

The known positioning devices of this type leave much to be desired. The generally simplest type of power transmission, namely a friction wheel drive, has so far not been used for such devices, probably because it is feared that, in case of insufiicient coupling or pulling force of the friction wheels, an uncontrolled dropping of the warp beam in one or the other direction of motion can not be prevented. It has to be taken into consideration that, when the readywound warp beam is to be swung out of working position, it must first be lifted from that position by the driving mechanism, whereupon, after the warp beam has reached its highest point, no further driving power is necessary, because of the overhauling weight of the warp beam. That is, when this point is reached, the driving impetus is supplied by the weight of the warp beam and therefore works in the opposite direction. The driving mechanism then acts as a brake to secure a gradual swinging movement at predetermined speed.

'It is an object of my invention to provide a warp-beam positioning device which, in comparison with the known devices, is simple in design, easily controllable and reliable in operation.

To this end, and according to my invention the swinging device is actuated by means of friction wheels, which are arranged in such a way that the pressure with which the driven friction is increased by the overhauling weight of the warp beam.

According to a more specific feature of the invention, the swinging arm structure for rotatably supporting the warp beam is connected to the actuating means by a shaft which is axially displaceable in forward and reverse directions. The shaft has one end provided with a gearing for the operation of the swinging arm structure, while the other shaft end carries a pair of opposed friction wheels to be selectively driven by an intermediate third friction wheel.

According to another feature of the invention, the just-mentioned gearing includes a self-locking worm gear whose worm is mounted on the shaft of the two opposed friction wheels so as to impose a friction-increasing force in the axial displacement direction upon the shaft and the driven friction wheel when the warp beam weight is overhauling.

These and other features as well as the advantages of the invention will be understood from;

the following detailed description, taken inconthe driving friction wheel nection with the accompanying drawing showing by way of example a preferred embodiment of the invention. However, it is to be understood" that the invention is not confined to strict conformity with the drawing, but may be changed or modified without material departure from the salient features of the invention as expressed in the appended claims.

In the drawings:

Fig. 1 is a side elevation of the device showing the warp beam in its working position; and

Fig. 2 is a similar side elevation of the same device, showing the warp beam swung out of the working position.

Mounted on the machine frame I of the illustrated warper is an electric motor 2 whose shaft has a friction wheel 3. Positioned on both sides of the friction wheel 3 are two discs or friction wheels 4 and 5 which are rigidly mounted on a shaft 6. The shaft 6 is journalled in bearings 1 and 8 in which it is axially displaceable. The shaft 6 has a collar 9 engageable by a bifurcated control lever l0, stationarily pivoted at H, with a control stick l5 and a handle M movable in the directions indicated by arrows l 2 and I3.

Mounted on shaft 6 is a worm 6 meshing with a worm wheel I? rotatably'mounted on a shaft l8 and joined with a pinion l9. Pinion l9 meshes with a toothed segment 20 connected to a swing-arm structure 2|. The arm structure 2| has at its upper end a bearing 22 for revolvably accommodating a warp beam 23. During warping operation, the warp beam 23 rests against a pressure drum 25 which is rotatably mounted on a shaft 24 and drives the warp beam through frictional contact with the latter. The arm structure 2! is pivoted on a shaft 26 for angular movement about that shaft in the directions indicated by the arrows 21 and 28. The shaft 26 is rigidly secured to the machine frame I. The highest point of the swinging movement of the warp beam axis lies in the vertical axial plane of pivot shaft 26. This point is indicated at 29. It will be recognized that at point 29 the beam-carrying structure 2| is in labile equilibrium. That is, when the structure is being moved by the drive from the working position of Fig. 1 toward point 29, the beam weight acts as a load that must be lifted by the drive; but.

position of Fig. 2 to the operating position of Fig. 1, the handle 14 is pressed in the direction indicated in Fig. l by the arrow [2. The pressure thus exerted aganst the handle [4 is transmitted by stick l5, lever l and collar 9 to shaft 6. Shaft 6 is forced toward the left. This causes the worm IE to turn a small amount relative to the teeth of gear I'I. As a result, the shaft 6 is displaced toward the left and the disc 4 is pressed against the friction wheel 3. The friction wheel 4 then transmits .the'd-riving force of the motor 2 to shaft and worm [6 which drives the worm wheel I! and, through gear wheel l9 and segment 20, the arm structure 2! supporting the warp beam 23. As a result, the warp beam 23 is swung in the direction of arrow 281 After the beam has passed through its highest position at point 29, the handle 14 may be released by the operator. From point 29 on, the overhauling weight of the beam acts to increase the pressure between disc 4 and friction wheel 3 tosuch an extent that the frictional engagement sufiices to prevent the warp beam from being accelerated by its overhauling weight-and dropping toward the drum 25. The increased frictional pressure is caused by the circumferential pressure of the worm wheel I! which, while rotating in counter-clockwise direction, forces the worm i6 and the shaft 6 toward the left of the device (see Fig. 1). The worm gearing l6, I1 is preferably of the self-locking type to more reliably secure the just-mentioned performance. When the beam 23 reaches the operative position in which the surface of the beamed material touches the surface of the'pressure drum 25, the beam weight commences to becarried by the drum 25. As a result, the pressure previously exerted by gear I! through worm it upon the shaft 6 ceases so that the pressure between friction disc 4 and wheel 3 also comes to an end and no further driving effect is transmitted from the motor .2 to the beam.

When the warp beam 23 is to be swung from the operating position (Fig. 1), to the inactive position (Fig. 2) the disc 5 is first pressed'against the friction wheel 3 by pressure applied by the handle l4 through bar l5, lever and collar 9,to the shaft 6. This causes the operation to occur in the reversed sequence, and the warp beam is then prevented from dropping toward the outside in the same manner as described above. When the beam reaches the lowermost position it abuts against a stop (not shown) so that its weight ceases to act upon the worm l6 and the shaft 6, thus relieving the frictional pressure between disc 5 and wheel 3.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. In a warper, the combination of warp-beam supporting structure pivotally mounted for angular movement between warping and inactive positions respectively, and having a range of pivotal movement including a point of labile equilibrium so that the beam weight is opposed to movement of said structure from one of said positions to said point and is overhauling beyond said point, a gear train connected with said structure and having a revolvable gear member axially displaceable due to overhauling beam weight, a revolvable transmission shaft joined with said gear member and axially displaceable together therewith, a friction gear having a driving member and a driven member engageable with each other under frictional pressure, said driven member being secured to said shaft for revolving said shaft and being axially displaceable together with said shaft in a direction toward said driving member for increasing said pressure in dependence upon axial shaft displacement caused by said overhauling weight.

2. A device for swinging the warp beam of a warping machine into and out of working position, comprising a frame, a warp-beam support structure pivotally mounted on said frame, a drive shaft revolvably *journalled on said frame and axially displaceable relative thereto, a gearing .in driving connection with said structure and having a gear worm secured to said shaft, two coaxial friction wheels firmly mounted on said shaft and having respective friction surfaces facing each other, and a third friction wheel arranged between said coaxial friction wheels and selectively engageable with said surfaces to drive either one of said coaxial wheels.

3. A device for swinging the warp beam of a warping machine into and out of working position, comprising a frame, a warp-beam support structure pivotally mounted on said frame and having a path of movement including a labile equilibrium point so that the beam weight opposes movement of said structure up to said point and is overhauling beyond said point, a drive shaft revolvably journalled on said frame and axially displaceable relative thereto, a gearing in driving connection with said structure and comprising a self-lockng worm drive having a gear worm secured to said shaft to cause axial displacement of said worm and said shaft when said weight is overhauling, two coaxial friction wheels mounted on said shaft and having respective friction surfaces facing each other, and a third friction wheel arranged between said coaxial friction wheels and selectively engageable with said surfaces to drive either one of said coaxial wheels, said axial displacement being in the engagement direction of said one coaxial friction wheel.

4. In a warper, the combination of warp-beam supporting structure having journal means for revolvably accommodating a warp beam and being pivoted about an axis below said journal means for swinging movement between warping and inactive positions, said structure having at said journal means a path of movement extending through the vertical plane of said axis so that the beam weight is opposed to said movement from one of said positions to said plane and is overhauling during the rest of said movement, a transmission shaft geared to said structure for driving said structure from one of said positions to beyond said plane, said shaft being capable of axial displacement in response to overhauling weight of said structure, a friction gearing having a power input member and a power output member engageable with each other under frictional pressure, said output member being drivingly connected with said shaft and being movable toward said input member in depend ence upon said shaft displacement for increasing said frictional pressure due to said displacement.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,787,323 Reiners Dec. 30, 1930 1,795,506 Reiners Mar. 10, 1931 2,382,760 Wiggermann Aug. 14, 1945 2,491,740 Lambach Dec. 20, 1949 FOREIGN PATENTS Number Country Date 783,984 France Apr. 15, I935

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