US2308663A - Warping machine - Google Patents

Description

Jan. 19,1943. G. WIGGERMANN v 2,308,563

l wARPING MACHIE Filed Jap. 4, 1945. f 2 sn'e'etssheet 1' Patented Jan. 19, 1943 parte sra Georg Wiggermann, Gladbach-Rheydt,

Ger-

many; vested in the Alien Property Custodian Application `lanuary 4, 1941, Serial No. 373,137 1n Germany January 26, 1940 5 Claims.

It has not been possible up to the present time, without employment of complicated devices, to harmonize the braking of a warping beam and its pressing roller, so that the retarding eifect upon these two rotating elements keeps their circumferential speeds equal throughout their deceleration, regardless of the diameter of the warp-ball or of the instantaneous conditions of rotational energy. This is especially noticeable in the warping of soft beams, for instance of cellulose wool yarn. As the circumferential friction between beam and pressing roller is then very slight, the direct effect of the circumferential friction assisting the maintenance of synchronized retardation is negligible. In this case slippage between winding material and pressing roller readily occurs during the braking and damages the threads.

Movement of the rotating bodies apart by means of an auxiliary device during the braking has been tried, but the force necessary for this is very great, owing to the extremely short time at disposal and to the mass to be moved. Also, the same force must be expended again by the attendant in some way, when the machine is started again.

According to the invention the rotational energy of at least one of the revolving elements is converted into a force that effects the desired separation of beam and pressing roller.

This is attained by supporting at least one of the revolving elements and its braking means so that the rotational energy of the said revolving element, when the brake is applied, is made to produce a force acting to cause a Vpositive Separation of beam and pressing roller, without the necessity of using any additional force therefor.

Further, the outward movement of the revolving element may be opposed by a regulatable resistance acting in the direction of its return movement.

Besides this, the rotational energy translated according to the invention into a force for the separation of beam and pressing roller, is utilized for intensifying the braking effect; either the moved revolving element is connected with the braking mechanism so that its movement increases the braking effect, or by its movement comes under the influence of a second brake.

Several embodiments of the invention are illustrated in the accompanying drawings, in which Figs. l to 8 are diagrammatic side elevations of eight diiferent modifications of warping beams, the parts having similar functions being designated by similar reference numerals.

The beam 4 is rockably journalled by means of a swing I upon the fulcrum 2 of frame 3. A spring 5 in Fig. l, presses the beam 4 against a pressing roller 6. The brake of beam 4 consists of two brake shoes 8 mounted on a bolt 'I Xed on swing I, said brake shoes being spread apart at the braking in usual manner by double cam S. The actuating element I0 for the brake, which is a cable connected with the brake lever II and trained through a guide at the fulcrum 2, is not inuenced by the oscillating movement of the beam. The directions of rotation are indicated by arrows. The drive may be applied directly to the beam 4, in which case the only function of the roller E is to press the yarn as it is wound, or the roller 6 may be driven and drive the beam 4 by friction. The driving means are not shown, since the invention is concerned only with the braking operation.

When the brake is applied, the braking turning movement produces upon the swing I a turning moment in the direction of the arrow F, the amplitude of which turning moment is proportional to the braking turning moment. The beam 4 thereby rocks away from the pressure roller 6, in the direction of the arrow F, against the action of spring 5, and holds its separated position as long as the braking procedure lasts. The extent of the rocking movement can be limited by a stop. As soon as the beam 4 comes to rest, that is, ceases to turn about its axis, the force swinging the beam away becomes zero because there is no longer any rotational energy. The spring 5 will therefore return the beam into its original position, The procedure just described makes it possible to overcome even the greatest, practically occurring pressing forces by a suciently great braking turning moment. The required turning moment exists already at a braking travel of 2 m. at 500 to 1000 rn./min. warping speed. In order to make the braking retardation of the one element more independent of that of the other element, a dynamic damper of low inherent friction may be inserted between the beam support, that is the swing I, and the frame 3, with the aid of which damper the returning time can be delayed to any desired degree and therewith the relative brake retardation of the two revolving elements rendered still more uncritical.

Such a damper is shown in Fig. 2. To the swing I is connected a piston I2 which is guided in the cylinder I3. The piston I2 is equipped with a large check valve I4 and a screw bore I5.

"At the braking as the beam 4 moves away, the

from the upper side almost without resistance downwards through the valve I2. When the impeded return movement begins, the oil must ow back through the narrow bore I5 to the upper side, which causes a more or less great retardation according to the cross section of the adjustable bore I5.

Fig. 2 shows in comparison with the form of construction shown in Fig. l the possibility of utilizing part of the force applied to the brake for the outward rocking of beam 4.

Fig. 3 illustrates a form of construction, in which the rocking force of the revolving element is utilized, not only for the outward rocking of the beam, but also for the actuation of the brake. A lever I6 pivoted upon a fulcrum pin I1 is connected with the brake lever IIa by a rod I8 and secured in any position against a movement in the direction for releasing the brake by means of a toothed sector I9 and a pawl 2). When the lever I6 is depressed, it presses the brake shoe 8 against the beam 4. `In the following rocking movement of the beam in the direction of the arrow F, the lever I6 is pulled upwards, but cannot yield as the pawl 2B engages in the teeth I9. Because of the arrangement of levers shown the brake is thereby applied with a certain additional force, the beam 4 being held at a certain distance from the pressing roller. As soon as the number of revolutions of the beam is zero the force tending to rock the beam outward becomes zero, the tension of the lever I6 decreases, and it is then easy to completely release the brake.

In the form of construction shown in Fig. 4 two separately movable brake shoes are mounted on the swing I at the fulcrum 2l. The brake shoe 22 is connected to the frame 3 by its brake lever 23 through the intermediary of the link 24. An outward rocking movement of the beam 4 in the direction of the arrow F therefore elects the complete braking. The second brake shoe 25 is connected by its brake lever 26 to any force applying means released at the breaking of the thread. A slight application of the brake shoe 25 is suiicient, to initiate the outward movement of beam 4. Thereby the brake shoe 22 is automatically applied, its pressure, in dependence upon the construction of its connection with the frame, being any desired multiple of the actuation force released upon the lever 26. An automatic outward rocking of the beam is attained in this manner, and also a great braking eiect with only a small actuating force.

Fig. 5 shows another embodiment of the invention. The automatically increased braking effect may also be attained, as shown in this figure, by mounting the brake shoe 22 directly on the frame 3, instead of on the swing I as shown in Fig. 4. The beam 4 rocks to the left by the action of the first actuated brake 25 and thereby comes into braking Contact with the brake lining 22.

The rocking out of the beam can be attained also indirectly, as shown in Fig. 6. The beam 4 is driven by means of a chain 6D actuated by a sprocket wheel 5I journalled coaxially with the fulcrum for instance. A brake disc 21 is xed on the driving shaft of the sprocket wheel 6I and embraced by the brake shoes 28 and 29 mounted in the bearings 3U, 3l. The brake shoe 29 is hingedly connected with the swing I by means of a rod 32. The brake shoe 2'8 carries a jib 33, on the end of which acts the primary actuating force. When the brake 28 is applied, the swing I, and with it the beam 4, rock towards CFI the left as indicated by the arrow F. The swing, acting through the hinge rod 32 draws the brake shoe 29 against the brake disc 21'. By a transmission between swing I and brake shoe 2S, the braking effect caused by the primary force acting on the jib 33 can be accordingly increased.

In the form of construction shown in Fig. '7, the star-shaped lever 34 is mounted on the swing I so as to pivot about the beam axis. The starshaped lever 34 has three arms 35, 36, 31. The brake shoe 38 is mounted on the end of arm 35, and the braking force acts on the braking lever 39 of this brake shoe. A rod 4I is hingedly mounted on the end 40 of arm 3! and its free end is guided by a clamping device 42. This clamping device 42 allows the rod 4I to slip through only in leftward direction. 'I'he arm 36 of the star-shaped lever 34 serves for limiting the turning movement of this lever as, when rocking in right hand direction, it comes to bear against the free end of rod 4I. If a force applies the brake shoe 38, the braking turning moment is transmitted by the arm 35 to the star-shaped lever 34 and this lever is turned in clockwise direction. As the rod 4I, owing to the clamping device 42, can not be shifted towards the right, the whole beam support yields and gives way in the left hand direction, together with the beam 4, until the arm 35 comes to bear against the rod 4I, as shown in dot and dash lines. .fter the beam has stopped, a tension device, not shown, can rock the beam 4 into the initial position.

In the embodiments shown in Figs. 6 and '7, the turning direction of the beam and its outward oscillating direction are opposite to one another.

In Figs. 8 and 9 another form of construction is illustrated. 'I'he beam 4 carries on its right hand shaft end a hub 45 of a disk brake. The outer ring 4G of this brake is Xed on a toothed wheel 41, also journalled on the shaft of beam 4 and meshing with a toothed sector 48 mounted on the frame 3. The brake disks can be compressed by means of a cover plate 49 and actuated by a two-armed lever 5I mounted by a hinge 50 on the swing I. The braking force acts to the right on the end 52 of this lever. The braking moment is thereby transmitted to the frame 3 from the beam 4 by its shaft, the hub 45 fixed on the same, the brake disks and the toothed wheel 41, this toothed wheel rolling on the sector 48 and causing thus the outward movement of the beam. The toothed sector 48 may be convex if desired and then mesh with the toothed wheel on the opposite side of the same whereby, the turning direction of the beam remaining the same, a transverse movement of the beam in opposite direction takes place. In the constructions shown in Figs. '7 to 9, the turning direction is immaterial for the object attained according to the invention.

Instead of the beam, the roller Ii may be the moved and braked element, without any fundamental alterations.

W'hat I claim as my invention and desire to secure by Letters Patent of the United States is:

1. In a warp winding machine comprising two rotary elements, namely a warp beam and a pressing roller coacting therewith, a frame, a unit rockably mounted on said frame comprising a support and one of said rotary elements rotatably mounted thereon, means for rotatably mounting the other rotary element on said frame, and means for braking the rotary element formlng part of said rockably mounted unit, said braking means being adapted to transmit the force of momentum of the decelerating braked rotary element to said support to rock the latter in the direction to separate the rotary element thereon from the other rotary element.

2. A warp winding machine as described in claim l, wherein yielding means are disposed between said swing and said frame to restore the beam to normal position.

3. A warp winding machine as described in claim 1, wherein yielding means are disposed between said swing and said frame to restore the beam to normal position, and means to impede the return of the beam to normal position.

GEORG WIGGERMANN.

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