US3125130A

US3125130A - Zollinger

Info

Publication number: US3125130A
Authority: US
Publication date: 1964-03-17
Anticipated expiration: 1981-03-17

Description

March 17, 1964 H. ZOLLINGER 3,125,130

ARRANGEMENT ON A LOOM WITH FIXABLE LOOSE REED Filed Aug. 2, 1961 4 Sheets-Sheet 1 March 17. 1964 H. ZOLLINGER ARRANGEMENT ON A LOOM WITH FIXABLE LOOSE REED 4 Sheets-Sheet 2 Filed Aug. 2, 1961 March 17, 1 964 ZOLLlNGER v 3,125,130

ARRANGEMENT ON A LOOM WITH FIXABLE LOOSE REED Filed Aug. 2, 1961 4 Sheets-Sheet 3 March 17, 1964 H. ZOLLINGER 3,125,130

ARRANGEMENT ON A LOOM WITH FIXABLE LOOSE REED 4 Sheets-Sheet 4 Filed Aug. 2. 1961 24 10 F I 25 FIG. 4 w w 3/ 26 21 35 J6 E Q 44 E 9 45 United States. Patent 3,125,130 ANGEMENT ON A LOOM WITH FLE LOUSE REED This invention relates to an arrangement on a loom with fixable loose reed whose one baulk, incident to the beating up of a weft, is positively locked by pivoted reed holders which are rigidly connected to each other and to at least one actuating arm which grips together with a supporting member as the weft is beaten up.

In a loom of the type it is known that the reed not yet locked can swing out to the rear and force the reed holders back should the shuttle be jammed in the shed and the reed come against the shuttle. Thus breaking of the warp threads and damaging of the reed incident to the beating up of the lay and irregular course of the shuttle is prevented. Further in the event of the shuttle being jammed and the reed coming against the shuttle, the latter must force the reed back. The whole force that is required for swinging out the reed and reed-holders, etc. must be produced by the warp threads in which the shuttle is jammed. In high-speed looms the accelerating forces that are then necessary for instantly swinging out the reed are of such magnitude that in the case of finer yarns often many threads will be broken or overstressed so as to cause appreciable damage.

The object of the present invention is to eliminate the aforementioned inconvenience. Accordingly it is principally characterized by the provision of initially tensioned springs adapted to produce the accelerating forces necessary for swinging out the reed in the event the shuttle is jammed in the shed.

This arrangement has the advantage that the forces which are necessary for swinging out the reed in the event the shuttle is jammed in the shed, need no longer be produced by the warp threads so that these threads are no longer stressed at all in the event the shuttle is trapped in the shed. Consequently it is no longer necessary to keep the dimensions of the loose reed and reed-holders small in order to prevent breakage of the warp threads in case of a shuttle being jammed. v

In different heavy fabrics the force upon the reed is of adiiferent magnitude according to the type of fabric, not only with respect to the actual throw of the reed, but also immediately prior to this moment. These differences can be considered inasmuch as the magnitude of the pressure necessary to collapse the toggle joint according to the invention is adjustable. In this way unnecessary swinging out of the reed can be avoided. 7

Other features of the invention will appear from the following description and claims, taken in conjunction with the accompanying drawing which represents, purely by way of example, one form of embodiment incorporating the invention.

FIG. 1 is a fragmentary elevation view diagrammatically illustrating essential parts of a loom andrthe course of movement of the lay;

FIGS. 2 and 3 are fragmentary elevation views partly in vertical section and partly in side view, and each illustrate, in a different phase of movement, the arrangement according to the invention;

FIG. 4 is a fragmentary elevation view similar to FIGS. 2 and 3, and illustrates the arrangement at the moment of throwing-out the reed by a shuttle being jammed in the shed.

For a better understanding of the object of invention,

some essential parts of a loom are represented in FIG. '1. The lay 1 embodies a race plate 10 and a reed 11, between the reed teeth of which the

warp threads

12 and 13 of the fabric 14 to be woven are passed through, which runs over a breast beam 15. The race plate 10 is attached to two lay swords 16, only one of which is visible in FIG. 1, which supports are at their bottom end pivotally mounted by means of hinge-pins 17 on the machine frame (not shown). Each lay sword 16 is connected by means of a pusher arm 18 to a crank 19 driven by a shaft 20. As the shaft 29 rotates with the crank 19, the lay 1 is imparted a reciprocatory movement through the pusher arm :13. The solid lines represent the rear dead center A of the lay, whilst the broken lines show the forward dead center B in which the previously inserted weft is beaten up by the reed. Also represented in broken lines is an intermediary position C in which, as the lay moves forward in the sense of the arrow D (FIG. 3) i.e. to the right in FIG. l-the shuttle (not shown) must have left the shed in order not to interfere with the movement of the reed or to prevent the warp being endangered.

FIGS. 2 and 3 illustrate the arrangement according to the positions A and B (FIG. 1) of the lay. Race plate Ill, reed 11,

warp threads

12 and 13 and fabric 14 are given the same reference characters as in FIG. 1. The race plate it? made of, say wood, is supported on a rectangular profiled metal tube 21 which is attached to the lay swords 16. The lay swords have also arranged thereon a profiled metal bar 22 which forms the lay cover. The reed '11 possesses an upper baulk 23 which engages a groove in the lay cover 22, and a lower baulk 24 which rests on a profiled bar 25 that is attached to some reed holders 26, of which only one is visible in FIGS. 1 and 3, and which are connected to each other by the profiled bar 25. The profiled bar 25 extends over the entire width of the reed 11. The number of reed-holders 26 may be as desired, depending on the width of the loom. Usually three holders 26 per meter will suffice.

All reed holders 26 are fixedly mounted on a tubular shaft 27 which is journaled in bearings (not shown) fixed to the lay swords d6. Said shaft 27 is common to all reed-holders 26, at least one of which carries a rigid operating arm 28 having a roller 29 rotatably mounted thereon. The rectangular profiled tube 21 has displaceably mounted therein a transverse pin 30 which, by means of a spring 31, can be pressed through an opening in the wall of tube 21 towards the reed holder 26. Said pin tends to rock the reed-holding lever 26 and thus the shaft 27 with the actuating arm 2%; counterclockwise and causes the roller 29 to press against a lever or arm 32 which is pivotal about an axle 33. The lever 32 has attached thereto a triangular plate 34 which carries a roller 35. Also pivotal about the axle 33 is a lever 36 having a pawl 37 which is rockable about a spindle 38 on lever 36. The pawl 37 embodies a short arm 39 adapted to cooperate with a stationary setscrew at The lever 32 with the triangular plate 34 having thereon the roller 35 may, together with lever 36 and pawl 37, constitute a rigid triangle that is rockable about the axle 33. A spring 41, stationarily supported at one end and pressing with its free end against the lever 36, tends to turn this triangle counterclockwise and to press with the arm 32 against the roller 29. On the other hand, the roller 29 is pressed against the arm 32 through the spring 31, as already mentioned. The triangle will therefore adjust itself in such a way that equilibrium prevails between the forces of the springs 31 and 4-1. In this position the setscrew M} can be set so as to provide quite a small gap 40a between setscrew ill and arm 39.

The arranged actuating arms 28 have associated therewith a supporting member 4-2, one each, which is formed by a lever oscillatably supported with a horizontal hingepin 44 on the loom frame 43. The top of the member 42 is movable in the direction of the picking movement of the lay 1, against the action of a resetting spring 46 which on the one hand engages the bottom end of member 42 and on the other hand is anchored to the loom frame 43. For determining the position of rest of the member 42 there is provided an adjustable stop formed by a setscrew 45. In the position of rest (FIGS. 2 and 3) of the member 42 the resetting spring 46 has a certain initial tension which may be varied by adjusting members (not shown).

The action of the described arrangement is as follows:

With the lay in its rear dead center (FIGS. 1 and 2) the torque exerted upon lever 32 by the pressure of roller 29 is smallest; the spring 41 is thus capable of securely holding the reed in its operative position (FIGS. 1, 2 and 3) even though, during the reversing movement of the lay (FIG. 1) in the rear dead center, the reed is subjected to appreciable inertia forces and is retarded in the following forward movement of the lay by friction on the

warp threads

12 and 13. Also the shuttle 50, which at this moment runs through the open shed, cannot force the reed 11 back against the action of spring 41.

If, with normal weaving operation, the lay 1 moves into the forward dead center B (FIGS. 1 and 3) for beating-up the inserted weft, the roller 29 advances on lever 32 so far as to enable the actuating arm 28 to rest on member :2 (FIG. 3). Thereby the latter is swung to a slight extent against the action of the resetting spring 46 and moves clear of the stop-screw 45. By the member 42 the arm 23 is prevented from moving downwards in the sense of the arrow E (FIG. 4). The imaginary plane, which passes through the axes of roller 29 and shaft 27, extends substantially at right angles to the imaginary plane that passes through the axes of roller 29 and hingepin 44. In this way positive locking of the reed holders 26 and profiled bar 25 is provided. The reed 11 will thus be clamped at this moment and able to beat up properly the inserted weft, even if a heavy fabric is being woven that requires a comparatively strong beating-up force. Deviation of the profiled bar 25 to the rear in the sense of the arrow F (FIG. 4) is impossible.

The reactive force of the beating-up pressure is transmitted from the actuating arm 28 to the member 42 substantially in radial direction to the swing axle d4 of said member.

Should for any reason the shuttle 5i! be trapped in the shed, it will, as they lay passes through the intermediary position C (FIG. 1), force the reed 11 to the rear. At this moment the actuating arm 28 is not yet supported by the member 42. The pressure of the shuttle against the reed ll, assisted by the spring 31 acts upon the reed holder 26, the equilibrium of the forces that had prevailed between the springs 31 and 41 is disturbed. The spring 41 is compressed to an extent. This causes the arm 39 to abut on the set-screw 4th The powl 37 is rocked counterclockwise and disengages with roller 35. Hence the lever 32 and roller 29 are no longer supported. The actuating arm 28 comes against the back of member 42, whereby the spring 46 makes possible a yielding or swinging of the member. Consequently the spring 31 can swing the profiled bar 25 entirely out of engagement with the reed 11, as illustrated in FIG. 4.

The lay 1 can move still further forwards in the direction of the arrow D (FIG. 1) until the loom is stopped in known manner by being disconnected from the driving motor.

From the foregoing it appears that by the described arrangement any damaging of the

warp threads

12, 13, reed II, roller 29 and supporting member 42 is practically excluded, even with the shuttle 5t) trapped in the shed. The reed can be swung out with big force by the spring 31 as soon as, by a slight additional force of the shuttle St on the reed 11, the pawl 37 becomes disengaged from the triangular plate 34 with the roller 35. Nevertheless, in the rear dead center of the lay, the reed is securely held and in the forward dead center firmly locked. Sliding friction occurs nowhere, thus wear and tear in the arrangement are much reduced. The big accelerating forces that are necessary for the reed and reed holders to be swung out in time in the event of the shuttle remaining jammed, are produced by the strong springs 31.

The adoption of a tubular shaft 27 has the advantage that, with its comparatively light weight, it ensures optimum stiffness against twisting. Since the shaft extends over the full length of the lay, because of its bending strength it moreover appreciably contributes to stiffening the arrangement.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is:

1. In a loose reed motion for power looms having a shed, a lay movable alternately forwardly to beat up the weft and rearwardly, a reed movably supported for movement with said lay, the improvement which comprises, means operable cyclically for releasably locking said reed in place when said reed is moved forwardly to beat up said weft and said shed is free of obstructions, means to render ineffective said means operable cyclically to lock said reed when said shed is obstructed, and means responsive to the last-mentioned means to swing the reed rearwardly independent of the movement of said lay when said shed is obstructed thereby to preclude the reed from being moved rearward solely by the obstruction in Said shed and the warp threads and thereby to positively preclude breakage of said warp threads.

2. In a loose reed motion for power looms having a shed, a lay movable alternately forwardly to beat up the weft and rearwardly, a reed movably supported for movement with said lay, the improvement which comprises, means operable cyclically for releasably locking said reed in placewhen said reed is moved forwardly to beat up said weft and said shed is free of obstructions, means to render ineffective said means operable cyclically to lock said reed when said shed is obstructed, and spring actuated means responsive to the last-mentioned means to swing the reed rearwardly independent of said lay when said shed is obstructed thereby to preclude the reed from being moved rearward solely by the obstruction in said shed and the warp threads and thereby to positively preclude breakage of said warp threads.

3. In a loose reed motion for power looms having a shed, a lay movable alternately forwardly to beat up the weft and rearwardly, a reed movably supported for move ment with said lay, the improvement which comprises, means operable cyclically to a state of equilibrium locking said reed positively in place when said reed is moved forwardly to beat up said weft and said shed is free of obstructions, means to preclude setting of said state of equilibrium to render ineffective said means operable cyclically to lock said reed when said shed is obstructed, and including means responsive to the last-mentioned means to swing the reed rearwardly independent of the said lay when said shed is obstructed thereby to preclude the reed from being moved rearward solely by the obstruction in said shed and the warp threads and to thereby positively preclude breakage of said warp threads.

4. In a loose reed motion for power looms having a shed, a lay movable alternately forwardly to beat up the weft and rearwardly, a reed movably supported for movement with said lay, means operable cyclically to a state of equilibrium for locking said reed positively in place when said reed is moved forwardly to beat up said weft and said shed is free of obstructions, means to preclude setting of said state of equilibrium to render ineffective said means operable cyclically to lock said reed when said shed is obstructed, and means responsive to the absence of said state of equilibrium to swing the reed rearwardly independent of said lay when said shed is obstructed thereby to preclude the reed from being moved O rearward solely by the obstruction in said shed and the warp threads and thereby to positively preclude breakage of said warp threads.

5. In a loose reed motion for power looms having a shed, a lay movable alternately forwardly to beat up the weft and rearwardly, a reed movably supported for movement with said lay, means operable cyclically to a state of equilibrium locking said reed in place when said reed is moved forwardly to beat up said weft and said shed is free of obstructions means to cooperative with said reed to sense an obstruction in said shed and preclude setting of said state of equilibrium to render inelfective said means operable cyclically to lock said reed when said shed is obstructed, means responsive to the absence of said state of equilibrium to swing the reed rearwardly independent of the movement of said lay when said shed is obstructed thereby to preclude the reed from being moved rearward solely by the obstruction in said shed and the warp threads and thereby to positively preclude breakage of said warp threads, and means to adjust the pressure said loom reed must develop against said obstruction in said shed to cause preclusion of said setting of said state of equilibrium.

References Cited in the file of this patent UNITED STATES PATENTS