US2070361A - Wire loom with weft grab bars - Google Patents

Description

Feb. 9, 1937.

w. KLEMM WIRE LOOM WITH WEFT GRAB BARS:

5 SheetsShee-b 1 Filed April 27. 1935 v W WM MH m Feb. 9, 1937.

w. KLE MM WIRE Loom WITH WEFT GRAB BARS Filed April 27; 1955 5 Sheets-Sheet 2 Feb. 9, 1937. w. KLEMM 2,070,361

WIRE LOOM WITH WEFT GRAB mas Filed April 27, 1935 5 Sheets-Sheet :5

w; big-M Feb. 9, 1937. w, R EM I WIRE LOOM WITH WEFT GRAB BARS 5 Sheets-Sheet 4 Filed April 27. 1935 Feb. 9, 1937. g M 2,070,361

WIRE LOOM WITH WEFT GRAB BARS Filed April 27, 1935 5 Sheets-Sheet 5 LNXW.

Patented Feb. 9, 1937 WIRE LOOM WITH WEFT GRAB BARS Willi Klemm, Neustadt-on-tlie-Orla, Germany Application April 27,

1935, Serial No. 18,640 g In Germany September- 6, 1933 Claims.

This invention relates to looms for the weaving of wire wherein the weft is laid across the garp by means of a pair of reciprocable weft ars.

An object of this invention is to provide an improved gripping means for the weft wire whereby either smooth or crimped wire may be laid across the warp, and wherein the weft wire is constantly maintained under sufficient tension to effect operation of a gripping means carried by each weft bar so that the gripping means will securely hold the wire.

Another object of this invention is to provide in combination with the wire gripping means carried by the weft bars an improved means for maintaining a tension on the wire beingfed to the weft bars.

A further object of this invention is to provide a means in combination with the weft bars and wire tensioning means. means whereby the loom is automatically stopped in the event of breakage of the wire between the source ofsupply and the weft bars, or upon failure of the gripping means carried by the weft bars to grab the wire.

A still further object of this invention is to provide a single source of supply for a pair of weft bars and'to'provide a resistance means maintained'under automatic tension to prevent loosening of the turns of wire on the supply spool during the withdrawal of the wire from the spool.

With theeabove and other objects in view, the invention resides in the form, construction and relative arrangement of the'parts of a loom construction, as will be hereinafter more fully described, illustrated in the accompanying drawings and subsequently incorporated in the subjoined claims. v

In the drawings, wherein Lhave illustrated a practical example of my present'improvements, and in which similar reference characters designate corresponding parts throughout the several views,

Figure 1 shows a diagrammatic view from the front of a pair of weft bars constructed according to an embodiment of this invention, together with a wire tensioning means for the weft wire.

Figure 2 is a View similar to Fig. 1, but showing the""weft bars in wire transferring position in substantially the center of the warp shed, the

latter being omitted for the purpose of better showing the transfer.

Figure'4 is a longitudinal section, partly in detail ,of the weft bars showing the bars prior to the transfer of the wire from one bar to another.

Figure 5 is a view similar to Fig. 4 showing the manner of releasing the wire gripping means of 5 one bar during the transfer of the wire.

Figure 6 is a viewsimilar to Fig. 4 showing the position of the bars as the transfer of the wire from one bar to the other is completed.

Figure 7 is a view similar to Fig. 4showing the weft bars moving away from each other with the wire being drawn through the warp shed.

'Figure 8 is a view similar to Fig. 4 showing the manner of releasing the wire in the pulling weft bar at substantially the moment of the cutting off of the wire at-the opposite edges of the warp.

Figure 9 is a detail side elevation on a larger scale of the wire tensioning means.

FigurelO is an enlarged sectional view taken on the line Ill-40 of Fig. 4.

. Figure 11 is an enlarged sectional view taken onthe line ll-ll of Fig. 4.

Figure 12 is an, enlarged sectional .view taken on the line l2-l2 of Fig. 4.

- Figure 13 is an enlarged sectional view taken on the linel3l3 of Fig. 4.

Figure 14 is a fragmentary diagrammatic view of a modified form of wire tensioning means.

. Figure 15 is a diagrammatic view of-a further embodiment of wire tensioningmeans.

Figure 16 is a top plan of the woven wire.

Figure 1'7 is a fragmentary detail side elevation of one of the weft bars.

- Figure 18 is a top plan of the bar shown in Fig. 1'7.

Referring to the drawings, and first to Figure 1, the numeral 20 designates a weft bar which is slidably mounted on a guide 2| extending transversely of the frame of the loom (not shown). This weft bar 20 is reoiprocated by means of a rock lever 22 connected to a suitable operating means, also not shown and of a conventional character.

The weft bar 20 is a wire carrying-bar, and is adapted to carry-a weft wire 23 across the warp and within the warp shed. A second weft bar 24 is slidingly mounted on the guide 2! in opposed relation tofth'e carrying bar 20 and constitutes a weft draw bar which grabs the-wire from the carrying bar 20 and draws the wire across the warp under the action of a rock lever 25, also connected to a suitable lever operating means not shown.- 1

' .I'he lower end of the lever 22 is rockably mounted on a stationary; part 2b of the frame of 5 the loom, and the lower end of the lever 25 is also rockably mounted on the part 26 of the frame on the side opposite from the connection of the lever 22.

The wire 23 is initially disposed on a supply spool or pulley 21 which is rotatably supported by a suitable portion of the loom frame, and in the present instance may be mounted on an extension of the part 26 of the frame. The wire 23 is first trained over a tensioning pulley 28 which is yieldingly supported from a spring 26 secured at its upper end to a stationary part of the loom frame. The wire 23 is then drawn downwardly and trained over a second pulley 36 which is rotatably carried by a rock lever-3| extending laterally of the framepa'rt 26. The wire 23 is then brought upwardly and trained over a stationary pulley 32 carried by a pair of arms 33 fixed to the frame of the loom adjacent the end of the guide 2 I.

A braking member 34 is mounted on a wire braking lever 35, which is rockably mounted one frame piece 36. This lever 35 is pivotally secured to the frame piece 36 at a point intermediate the ends thereof, with the braking member 34 at one end of the lever 35, while the opposite end of the .lever 35 is attached to one end of a lever tensionrelative to the arm 3| and rocks therewith. This arm 38 is connected to a loom stopping bar 36 which is provided with an elongated slot 39a thereby providing a degree of lost motion before 35 ,the bar 39 is actuated. A spring 46 is connected at one end to the lower end of the frame piece 36 and at the opposite end to the lever 3| so that in the event ofundue slack occurring in the wire 23 the lever 3| will be drawn downwardly and the crank arm 36 rocked forwardly to move the stopping bar 39 and thereby stop the loom.

The weft carrying bar 26 is provided with a guide 4| in which the wire 23 is disposed, and the wire 23 is passed through a wire transferring guide 42 at the forward end of the bar 26, and this guide 42 has a tapering nose 43 through which the wire 23 is adapted to protect.

A wire gripping means, generally designated as 44 is carried by the bar 26 adjacent the forward end thereof, and comprises a toothed gripping member 45 pivoted as at 46 to thebar 26. An arm or lever 41 is fixed relative to the gripper 45 and extends rearwardly thereof.- A gripper tensioning lever 48 is pivotally secured as at 49 to the bar 26, and is also pivotally secured at its Y forward end to the rear end of the arm 41. A

tensioning spring 56 is fixed to the lever 46 and has an end thereof disposed in a position for engagement with the wire 23 so as to tension this wire in the guide 4|. A threadedtensioning member 5| is carried by the lever 46 and bears against the spring 56 so as to not only tension the gripper 45 against the wire 23 but also to, provide a suitable drag on the wire when the bar 26 is moving from beneath'the warp shed. This portion 52 shaped to snugly receive the tapered nose 43 when the bars 26 and 24 are in transferring position in the center of the shed. The

draw bar; 24 is provided with a gripper 53 pivoted-.-

as at 54 to the bar 24 adjacent the forward end thereof, and this gripper 53 is reversely position with respect to the gripper 45 so that the gripper 53 will firmly hold the wire 23 in the bar 24 as the bar 24 moves outwardly and away from the 'bar 26. An arm 55 is fixed relative to the gripper 53 and extends rearwardly thereof, the rear end of the arm 55 being pivotally secured to a pressure lever 56, also pivotally secured as at 51 to the bar 24. A pressure spring 56 is secured to the lever 56 and is tensioned by means of a threaded member 56.

As the two weft bars 26 and 24 approach each other in the warp shed the gripper 53 is raised to a releasedposition by means of a draw bar 66 'wl.ich is secured at one end to the gripper 53. A releasing lever 6| is pivoted as at 62 to the bar 24 and is also pivotally connected as at 63 to the draw bar 66. The upper end of the releasing lever 6| has a pivoted portion 6|a under tension of a'spring 64 which constantly holds the 53 so that the end of the wire 23 projecting forwardly of the nose 42 may freely pass beneath the gripper 53. After the lever 6| passes the stop 65 the spring 66 will swing the lever 6| forwardly and coactively swing the gripper 53 downwardly against the end of the wire 23. The

swinging of the gripper 53 to gripping position is also facilitated by the spring 56. This release of the gripper 53 is clearly shown in Figure 5 where the end of the wire 23 is shown entering the forward end of the draw bar 24.

In Figure 6 there is 'shown the meeting of the two weft bars, which is done at the center of the warp shed, and in this position the gripper 53 is lowered to grip the end of the wire 23, with the lever 6| swung to its normal position by the spring 66.

Figure 7 shows the weft bars 26 and 24 separating, with the knuckle 6|a of the lever 6| passing beneath the stop 65, and in this movement of the weft bars the, wire' 23 slides through the bar 26 against the tension of the spring 56 and the dragging of the gripping member 45 thereon.

After the weft bars 26 and 24 have moved outwardly beyond the edges'of the warp the end of the wire held by the gripper 53 is released by means of a second releasing lever 61 pivoted to the bar 24 rearwardly of the lever 6| and connected to the rear end ofthe draw bar 66. This releasing lever 61 has a roller 66 on an end thereof which engages with an adjustable cam member 66 secured to a portion of the' loom frame. This cam member is adjustable lengthwise of the movement of the draw bar 24 so that the release of the end of the wire 23 may be effected at the proper time dependent upon the width of the warp.

When the wire 23 is released from the draw bar 24 this draw bar 24 may have a slight outward movement sufllcient to pull the end of the wire out of the forward endof the bar 24. It will be understood that the releasing lever 61 acts upon the draw bar 66 and the gripper 53 in the same will. be absorbed by the slidable guide 42.

able means (not shown) sofas to cut off the pro-' jecting ends of the wire 23.

Where wire is used which is relatively heavy an efficient form of wire tensioning means should be used, and in Figure 9 there is shown the tensioning means. In this form the wire 23a. is taken off of a pulley or spool 21a mounted similarly to the pulley or spool 21, and the wire 23a is then drawn upwardly to a tensioning pulley 28a which is yieldingly supported from a spring 29a. The wire 23a is then drawn downwardly and trained over a lower pulley 30a and then upwardly over an upper and fixed pulley 32a. The pulley 30a is mounted on a crank arm 3la connected to a stop rod 39a the same as the crank arm 3|. A spring 40a tensions the arm 3la and automatically moves this arm 3m to actuate the stop rod 39a when too much slack appears in the wire 23a, as when the wire is broken or the like.

A brake tensioning lever 35a is mounted on a frame piece 36a and carries a brakeshoe 34a. engageable with the wire remaining on the spool or pulley 21a. The lever 35a is tensioned by a spring 31a, as in Fig. 1.

In Figs. 17 and 18 there is disclosed the detailed construction of the weft bar 20 which carries the wire from the supply spool to the center of the warp for transfer to the weft bar 24. This weft bar 20 comprises an angular elongated bar 12 having one leg thereof horizontal and the other leg vertical, and at the forward end of this bar 12 there is provided a bearing block or guide member 13 in which the nose or wire guide 42 is slidable. By mounting the guide 42 for sliding movement in the bar 20 the two bars 20" and 24 may have their inner or confronting ends contact with each other during the transferring operation and the shock of the contact This manner of transferring the. wire will permit a relatively short piece of wire to be extended beyond the end of the guide 42 and the inward movement of. the guide 42 during the transferring operation will cause the extended end of the wire to be lengthened without bending of the end of the wire. An elongated rod 14 is secured to the inner end of the guide 42, and a spring 15 having one end secured to the rod 14 and the other end secured to a pin 16 on the bar 12 constantly urges the guidev member 42 outwardly.

In Figure 14 there is shown a further embodiment of this invention wherein a spool" 21b of uncrimped wire. has the wire strand 23b passed between a pair of crimping members 16 and H which are mounted on rock armsl8 and 19 respectively. In this embodiment the wire ten.- sioning means is positioned independently of the frame of the loom, being mounted on any suitable supporting structure. Before the wire 23b enters between the crimping rollers 16 and 11 it passes between staggered rollers or drag members which'if desired may be adjusted relative to each other to place the desired drag on the wire.

After the wire 23b passes between the crimping spring 84 which constantly urges the pulley 82 downwardly. The wire 23b is then trained over v a second idling pulley 85 which is so mounted that the wire 23b is drawn in a straight or horizontal line by the grab bar 20b which is similar to the grab bar 20. v

In the construction shown in Fig. 14 the loom is stopped by means of a stop rod 39b having one path of the downward movement of the lever 83. i

This lever 89 is connected to a crank 90 by means of a link 9|, and the crank 90 may be connected to an arresting mechanism or an alarm mechanism. i

In Fig. 15 there is shown a still further embodiment of this invention wherein the supply spool 210 is mounted on a standard or support 92 which may be disposed adjacent but independent of the frame of the loom. In this instance the wire 230 may be either initially crimped or may be uncrimped, being here shown as uncrimped and initially passing over an idling pulley Mo and underneath a tensioning pulley 820 carried by a rock lever 93. The rock lever 93 is pivotally mounted as at 94' on the standard or support 92, and the end of the lever 930pposite from the pulley B20 is formed substantially L- shaped as at 95. The terminal or upper end of the lever portion 95 is provided with a braking member 96 adapted to contact with the periphery of the spool 210 so as to prevent or retard rotation of the pulley or spool 210 when the lever 93 is in its lowermost position. The lever 93 is constantly urged downwardly to tension the wire 230 by means of .a spring 91. In this embodiment the stop rod 39c has an end secured to a'bell crank 86c, and the bell crank 86c is connected to a stop lever 810 by means of a link 880, so that when an undue strain is placed upon the wire 230 the lever 93 will be drawn upwardly and will rock the lever 81c and thus effect a stoppage of the loom structure.

The-operation of this device is as follows: The wire 23 is taken from the supply pulley 21 and trained over the pulleys 28, 30 and 32, and then threaded into the guide 4| of the weft wire carrying bar 20. The end of the wire is passed through the nose 42 and left projecting slightly beyond the nose 42. It is, of course, assumed that at this time the two weft bars20 and 24 are at their outermost positions. The weft bars 20 and 24 then move toward each other with in the shed of the warp, and just prior to the final inward movement of the weft bars the releasing lever 9| will raise the gripper 53 and permit the projecting end of the wire 23 to pass move. outwardly or away from each other. When the wire 23 is beneath the gripper 53 the lever 6| will have passed the stop 65 so that the gripper 53 will be swung downwardly into gripping position by the springs 58 and 66. Just prior to the weft bars 20 and24 reaching their outermost positions the second releasing member 61 engages the adjustable cam 69 and swings the gripper 53 into released position so that the wire 23 may be completely released from the. draw bar 24. At substantially the same moment as the release of the .wire 23 by the lever 61, the two scissors l0 and H are brought into action and cut off the portions of the wire, projecting beyond the warp.

In the above description and the accompanysorted to to accomplish similar results. Ac-

strand gripping means carried by the bars, thecordingly, it is to be understood that in practice I reserve the privilege of resorting to all such legitimate changes as may be fairly embodied within the spirit and scope of the invention as claimed.

As shown in Figure 14 the wire 23b may be trained over a pulley "mounted on a suitable portion of the loom frame, and the wire 23b may be cut in suitable lengths 99 by means of a scissors I" connected to the operating mechanism of the loom.

I claim:

1. In a loom a pairof reciprocable weft bars, operating means for the bars, rockable weft gripping means of one bar being active upon inward movement of said one bar and inactive upon outward movement thereof, the gripping means of gripping means of said other b'ar, an abutment disposed in'the path of said lever on the inward movement thereof whereby to swing said gripping means to released weft strand receivi position, a second lever connected to the gripp means of said other bar, and a second abutment engageable with said second lever during the outward movement thereof to thereby swingsaid gripping means of said other bar to released position.

2. Weft laying means comprising a pair of reciprocable elongated members, toothed weft strand gripping means carried by each member, means for pivotally securing the gripping means on the members, a iever'carried by one of said members, means for connecting the lever with the gripping means of said one member, an abutment disposed in the path of said lever on the inward movement thereof whereby to swing said gripping means to released weft strand receiving position, a second lever connected to the gripping means of said-one member, and a second abutment engageable with said second lever during the outward movement thereof to thereby swing said gripping means of said one member to released position.

3. Weft laying means comprising a pair of reciprocable elongated members, toothed weft strand gripping means carried by each member, means for pivotally securing the gripping means on the members, means for tensioning said gripping means, a lever carried by one of said members, 'means for connecting the lever with the gripping means of said one member, an abutment disposed in the path of said lever on the inward movement thereof whereby to swing said gripping means to released weft strand receiving position, a second lever connected to the gripping means of said one member, and a second abutment engageable with'said second later during the outward movement thereof to thereby swing said gripping means of said one member to released position.

'4. Weft laying means comprising a pair of 'reciprocable elongated members, toothed weft strand gripping means carried by each member, means forv pivotally securing the gripping means on the members. a lever carried by one of said members, means for connecting the lever with the gripping means 'of said one member, an abutment disposed in the path of said lever on the inward movement thereof whereby to swing said gripping means to released weft strand receiving position, a second lever connected to the gripping means of said one member, a second'- weft bars, means for connecting the lever with the gripping means of said weft bar, anabutment disposed in the path of movement of said lever on the inward movement thereof \whereby to swing said pping means to open .weft strand position for receiving the wire strand of the gripping means of the other weft bar,

- means for moving said first lever beyond said abutment to permit its gripping means to close upon the received weft strand, means for moving said weft bar in the opposite direction for draw-, ing the weft strand therewith, the positioning of the gripping member of the other weft permitting the free movement'of the strand therethrough, a second lever for the same weftbar having the first lever,'a second abutment engageable with said second lever during the outward movement thereof to thereby swing said gripping means of the first lever to weft strand releasing position, and means for tensioning the wire in a direction opposing the gripp g means during the movement of said weft bars.

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