US2082909A - Wire motion for looms - Google Patents

Description

W. W. ROBERTSON June 8, 1937.

IRE MOTION FOR LOOMS' Filed April 2. 1935 N RN Inventor Wilhaum w. Robertson Attorney Patented June 8, 1937 UNITED STATES PATENT oFF eE WIRE MOTION FOR LOOMS Application April 2, 1936, Serial No. 72,360

10 Claims.

This invention relates to improvements in wire motions for looms and it is the general object of the invention to provide a motion particularly adaptable to wide looms.

In the weaving of tapestry and Wilton fabrics it is customary to employ a series of pile wires which are introduced from one side of the loom and over which the loops of the pile yarn are formed. There is generally a set of wires, one wire being withdrawn from the front of the set to be inserted at a subsequent operation into the open shed under the raised pile yarns and take its place as the last of the set. When the fabric being woven is wide the pressure exerted by the pile loops is considerable, placing considerable strain on the parts which remove the front wire.

It has been customary on narrower looms to connect the wire carriage to a cable which is trained around a scroll rotated in opposite directions to effect, first, movement of the carriage along its slide toward the adjacent selvage, and then a reverse motion away from the selvage to withdraw the wire. It has been proposed to use chains or the like to operate wire motions of wide looms but such constructions are cumbersome .and expensive and it is an important object of my present invention to retain the type of wire motion used on narrower looms and provide an auxiliary source of power to initiate the wire extracting operation. I find that the greatest resistance occurs at the beginning of the wire Withdrawal and that by providing means to exert an additional force at this time, the ordinary fabric cable will sufiice to finish the outward motion of the wire.

It is another object of my invention to provide rigid or metallic means, such as a cam driven hook, to have direct pulling relation with respect to the wire carrier during the first few inches of outward travel of the wire. The aforesaid scroll will start its operation at the beginning of the withdrawing stroke but the force which it exerts will be supplemented by an additional force transmitted through devices which are stronger and subject to less stretch than the cable. As the wire moves out of the shed the cable will draw the carriage away from the auxiliary extractor, and the control for the latter is such that when the cable has a reverse motion to insert a fresh wire into the shed, said extractor will be in its inmost position where it will not interfere with the wire carriage.

With these and other objects in view which will appear as the description proceeds, my invention resides in the combination and arrangement of parts hereinafter described and set forth.

In the accompanying drawing, wherein a convenient embodiment of my invention is set forth,

Fig. 1 is a front elevation of one endv of a loom having my improved wire motion applied thereto,

Fig. 2 is a diagrammatic view of certain structure shown in Fig. 1 illustrating the mode of operation, and

Fig. 3 is a detailed top plan view taken in the direction of arrow 3, Fig. 1.

Referring to the drawing, the right hand loomside I0 is shown in Fig. 1, the loom proper with the harnesses and other weaving instrumentalities not shown being located to the left of this loomside. Extending from the right of the latter is an end frame H supporting a rotatable drum l2 journaled at I3 in the end frame. The drum has secured thereto a cable H! which extends around outer and inner guide sheaves l5 and I 6, respectively, and may be kept'tight by a third idle sheave I? mounted for horizontal adjustment toward and from the drum, with bolding means I8 as shown in Fig. 1 to retain the adjusted positions.

The end frame supports a wire guide bar 20 and there is also provided a wire carriage 2| sliding along a carriage rail 22. The cable is connected to the "carriage as illustrated in Fig. 3 and the carriage is provided with a hook 23 to co-operate with the pile wires P.

The drum I2 is fast with a driving pinion 25 meshing with a reciprocating rack 26 supported in a guide frame 21. A link 28 between the rack and a rotating crank arm 29 transmits motion from the latter to the drum. The crank arm is on a shaft 30 journaled in the end frame I I driven in any approved manner.

In the operation of the matter thus far described reciprocation of the rack 26 due to rotation of the shaft 30 will rock the drum l2 first in one direction and then in the other, sothat there is first a pull on the carriage 2| tending to move the latter outwardly or toward the "sheave IS on a wire withdrawing stroke, after which the drum reverses to move the carriage toward the cloth. The wire carriage 20 will ordinarily move from the forward position shown in Fig. 3 rearwardly after the foremost pile wire has been extracted to permit insertion of the latter into the shed. It is not deemed necessary to show details of the pile wires or the means for manipulating the rail 20, and the mechanism for driving the drum I2 of itself is not new, For

further details of the structure already described reference may be had to the following patents: 130,961, W. Webster; 960,211, F. A. Whitmore and 1,715,947, J. Petero.

5 In carrying my present invention into effect I provide means acting in conjunction with the drum l2 and cable I4 to exert on the carriage an additional force at the beginning only of its outward motion when attached to a pile wire by means of hook 23. To accomplish this result I provide a cam 40 which is secured to the shaft 30 in proper angular relation with respect to the crank 29, preferably as shown in Fig. 2, and further provide a cam lever 4! which pivots about a fixed axis 42. A roll 43 on lever 4| engages the cam 40 and the upper end of the lever is attached to a pull rod or link 44, as at 4 5. The left or inner end of the pull rod, as shown in Figs. 1 and 2, is hooked as at 46 to lie behind,

or to the left of a pin 41 projecting forwardly from the carriage 2!. A guide yoke 50 may be secured to the loom frame to support the inner end of the pull rod 44.

In operation and at the beginning of the wire '25 withdrawing operation, the arm 29 and link 28 will be substantially in alignment, as suggested in Fig. 2, with the roll 43 starting to rise up the incline 55 of the cam 40. This rise is rather abrupt and gives a relatively quick outward move- 30 ment of the lever 4| from the full to the dotted line position shown in Fig. 2, while the crank arm is moving from the full to the dotted line position in that figure. The parts are so proportioned, and the relation of the crank arm 29 and cam are such, that the hook 46 is moved to the right at a rate not essentially different from that of the cable. I find that there may be some slight variation in the rates of the hook and cable without damage to the latter due to the ability of the cable to stretch.

As the came 40 rotates in the direction of arrow a, Figs. 1 and 2, the hook and, therefore the pin 41 and carriage 2|, will move a space of several inches sufiicient to overcome the initial 45 resistance to motion on the part of the wire due to the binding of the pile yarns. After the hook has come to rest in the position shown in dotted lines in Fig. 2 due to the fact that the roll 43 has reached the high part of the rise or incline 55, the cable will be sufficiently strong to continue outward motion of the carriage, and the latter, together with the pin 41, will move away from the hook by a force derived from the rack and pinion which drives the drum l2. The cam has a gradual return surface 51 which merges with a dwell 58 coming under the roll 43 some time prior to the return of the carriage 2| from the outer to the inner position shown in Fig. 3. By this relation the hook 45 is always out of the 60 path of travel of the pin 41 as derived from the cable.

A spring 60 may be interposed between the lever ll-and a fixed part of the loom to hold the roll against the cam, although this spring is not -6 essential, since the pin 41 can if desired be re lied upon by its engagement with the hook 46 to return the lever from the dotted to the full line position shown in Fig. 2 when the cable moves the carriage to the inner or left hand position, at

'7 which time the dwell 58 will permit such motion of the lever.

" From the foregoing it will be seen that I have provided the comparatively simple auxiliary wire motion acting in conjunction with the usual cable and drum, the auxiliary motion serving to overcome the initial resistance to movement on the part of the wire, after which the cable can assume the full load and continue the outward motion of the carriage along its guide rail. It will further be seen that the cam and lever which operate the hook are so designed that the latter does not interfere with the return motion of the carriage 2| to the position shown in Fig. 3 during the insertion of a previously extracted wire into the shed under the pile yarns. It will also be seen that the cam is set to give its throw to the hook at a time when the crank arm 29 causes comparatively little motion on the part of the drum l2, thereby permitting the rates of travel on the part of the carriage induced by the drum and cam to be substantially the same, and in this connection the inclined surface 55 can be designed to give the hook a crank motion, or one closely simulating the motion given to the carriage by the drum.

Having thus described my invention it will be seen that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention and I do not wish to be limited to the details herein disclosed, but what I claim is:

1. In a wire motion for looms having a pile wire to be withdrawn, a pile wire carriage to be operatively related to the pile wire, a primary actuator operatively connected to the carriage and exerting a force on the latter throughout the wire withdrawing motion of said carriage, and an auxiliary actuator to be operatively related to and exert an additional force on the carriage during the first part of the wire withdrawing operation to assist the primary actuator.

2. In a wire motion for a loom having a pile wire to be withdrawn, 2. member to be operatively related to the pile wire for the purpose of withdrawing the latter, and two separate actuators for said member, one of said actuators exerting operating force on the member throughout the entire travel of the latter, and the other actuator exerting an additional force on said member during the first part only of the wire withdrawing stroke of the member.

3. In a loom having a pile wire to be moved longitudinally, a wire carriage to engage the pile wire, a primary actuator permanently connected to the carriage to exert a force on the latter throughout the entire movement thereof when withdrawing the wire, and an auxiliary actuator to exert an additional force on the carriage during the first part only of the wire withdrawing motion of the carriage.

4. In a pile fabric loom having a pile wire to be withdrawn, a carriage to be operatively related to the pile wire, a primary actuator for the carriage including a flexible cable, an operating drum therefor permanently connected to the carriage through the cable and exerting withdrawing force on the carriage throughout the entire wire withdrawing motion thereof, and an auxiliary actuator operating conjointly with the cable during the first part only of the wire withdrawing operation to exert an additional force on the carriage.

5. In a pile fabric loom operating with a pile wire to be withdrawn, a carriage to be operatively related to the pile wire, a pair of actuators for the carriage, and driving means for the actuators effective to cause both actuators to move at the beginning of the wire withdrawing operation and to cause but one of said actuators to remain operatively related to the wire throughout the remainder of the wire withdrawing operation.

6. In a pile fabric loorn having a pile wire to be withdrawn, a pile wire carriage to be operatively related to the pile wire, a rotatable drum, a flexible cable operatively and permanently connecting the drum and the carriage, a cam, a cam lever therefor, and a force transmitter interposed between the lever and the carriage efiective to exert a movement on the carriage in a direction to withdraw the wire during the first part only of the withdrawing motion of the carriage, said drum and cable thereafter continuing motion of the carriage.

7. In a pile wire loom having a pile wire to be withdrawn and over which pile yarns are looped, a carriage to be connected to the pile wire, a primary actuator to be permanently connected to and move the carriage throughout the withdrawing operation of the wire, and means detachably connected to the carriage and operative at the beginning only of the withdrawing operation to overcome the initial resistance to motion of the wire due to friction of the pile yarns.

8. In a pile wire loom having a pile wire withdrawing motion which is resisted by the pile yarns of the loom, a primary actuator operative throughout the wire withdrawing operation to exert a withdrawing force on the wire, and an auxiliary actuator to overcome the initial resistance to motion on the part of the pile wire due to friction of the pile yarns.

9. In a pile fabric loom having a pile wire held under pile yarn loops which exert a relatively high resistance to the beginning of the withdrawing motion of the wire and a less resistance after motion of the wire has been started, a primary actuator to overcome the lesser resistance and operative throughout the withdrawing operation to exert a continuous force on the wire, and a secondary actuator exerting a force in addition to the primary actuator for the purpose of overcoming said relatively large resistance opposing the beginning of the withdrawing motion.

10. In a pile fabric loom having a pile wire to be withdrawn and offering a relatively high resistance to the beginning of its withdrawing motion and offering a lesser resistance to the continuance of the withdrawing motion, two actuators both to be operatively related to the pile wire, means to cause one of the actuators to be operatively related to the wire and capable of overcoming the lesser resistance throughout the withdrawing motion of the latter, and means to cause the other actuator to add the force exerted thereby to the first actuator during the first part of the withdrawing motion of the wire to overcome said relatively high resistance.

WILLIAM W. ROBERTSON.

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