US3132672A - Industrial apparatus and method - Google Patents

Description

May 12, 1964 H. H. FLOYD ETAL 3,132,672

INDUSTRIAL APPARATUS AND METHOD Original Filed March 15, 1961 2 Sheets-Sheet 1 INVENTOR. HARMONSON H. FLOYD RAYMOND B. PATTERSON BY y 1964 H. H. FLOYD ETAL 3, 72

INDUSTRIAL APPARATUS AND METHOD Original Filed March 15, 1961 2 Sheets-Sheet 2 6O be 27 2 O 25 IA T O /|Z o\ 0 n FIG.2

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INVENTOR. HARMONSON H. FLOYD 1f'AYNlOND B, PATTERSON United States Patent 1 Claim. ((11. 139-445) -'Ihis invention relates to looms for weaving soft floor coverings and more particularly to improvements in Wilton and velvet pile fabric looms. The present invention contemplates a modification of the picking mechanism on a Wilton or velvet loom which weaves a one shot pile fabric. This terminology refers to the number of shots or filling wefts inserted per pile wire. Two and three shot Wilton and velvet fabrics have been produced for many years and this well-known construction was considered necessary in order to produce a sufiiciently stiff backing for the fabric and also to provide adequate bind for the pile yarns. By laminating a separate backing material to the back of a single shot fabric, we have found that we can produce a one shot fabric without any stuifer warps which is characterised by the desired tuft bind and stiff ground substantially equivalent to or better than the well-known two and three shot woven fabrics.

In addition to the benefits noted above, several unexpected and unexplainable results were achieved. In a one shot fabric woven in accordance with the present invention, the pile projections do not have the characteristic lay in any particular direction, usually the direction in which the wires are withdrawn. The pile yarns are straighter and definitely give more coverage per pound. This may or may not be attributed to the fact that when a pile fabric is woven without a stufier, the pile yarns that work under filling wefts are not permitted to become further buried in the ground fabric. In the usual two or three shot material where stuifer warps are used, there is a tendency for the pile yarns to extend farther into the backing fabric adjacent the stulfers than would be the case if the pile yarns were pulled tightly around the filling wefts under which they work. This theory is advanced as a possible explanation of the improved results but applicants do not wish to be bound thereby in the event subsequent knowledge indicates that this theory is inaccurate or incomplete. In any event, a pile fabric woven in accordance with the present invention has a better hand and is not characterized by the well-known directional set or lay of the pile.

A primary object of the invention, therefore, is to provide an improved apparatus for throwing the shuttle in a Wilton or velvet loom once for every pile wire insertion.

A further object of the invention is to provide in a pile fabric loom an improved triggering device operating from the shade camshaft for releasing the picking levers in the picking mechanism in the loom.

A further object is to provide an improved method for producing a one shot pile fabric having improved hand.

A further object of the invention is to provide cam controlled picking mechanism for throwing the shuttle in a pile fabric loom once for every turn of the camshaft.

Further objects will be apparent from the specification and drawings in which:

FIGURE 1 is a schematic view of our improved picking mechanism,

FIGURE 2 is an enlarged detail of the righthand portion of the mechanism shown in FIGURE 1 in the position just after the picking lever has been released to throw the shuttle,

FIGURE 3 is a view similar to FIGURE 2 with the 3,132,672 Patented May 12., 1964 crank turned about to show the cocked, and

FIGURE 4 shows the picking crank rod moved from the position of FIGURE 2.

Referring now more particularly to the drawings, the picking mechanism on a conventional Wilton or velvet loom comprises a picking spring contained in a picking spring tube 10 mounted on the loom frame or girt 11. In the present invention the picking spring is alternately loaded or compressed through the agency of two crank rods 12 and 13 connected to cranks or crankshafts 14 and 15 respectively which are drivingly associated with the main crankshaft of the loom through the bottom back camshaft (not shown). Crank rods 12 and 13 are pivotally mounted .to the picking rocker arms 16 and 17 pivoted in brackets 18 and 19 at 20 and 21 respectively. Rocker arms 16 and 17 intermittently contact the picking levers 25 and 26 each of which is in turn controlled by the picking spring through associated links 27, 28 and picking spring rods 29, 30. Each of the picking levers 25 and 26 actuates picking sticks 35 and 36 through connecting leather picking straps 37 and 38. As seen in FIGURE 1, picking stick 35 is pivoted at 39 andis on the righthand side of the loom, whereas picking stick 36 is on the left side. As is well known, when the picking lever is released, the top of the picking stick 35 is in contact with the picker 45 which contacts the shuttle 46. Alternate actuation of the picking sticks 35 and 36 throws the shuttle 46 back and forth across the lay from the righthand picker 45 to the lefthand picker 47. The mechanism described above is generally found on pile wire fabric looms as distinguished from tufting and knitting machines that may or may not be used to produce pile fabrics.

We have modified the picking mechanism described above so that the shuttle 46 is thrown to insert a filling weft for every pile wire. The shade camshaft 50 is provided with an adjustable crank 51 which drives a connecting rod 52 journaled at one end to a trigger rod 53 slidable in guides 54 and 55. The trigger rod 53 is provided with a pair of adjustable triggers 56 and 57 which are mounted in collars 58 and 59.

Referring to FIGURES 2-4, the operation of the cocking and picking mechanism will be more clearly described. FIGURE 2 shows the mechanism after a pick is made and with the links 16 ready to load the picking spring for the next shot by pivoting picking lever 25 clockwise to engage the lever pin 6th with the sear 61 on the knockoff lever 62. -As crankshaft 14 continues to rotate in a clockwise direction in FIGURE 3, the rocker arm 16 pivots the picking lever 25 until the pin 60 contacts the face 65 of sear 61 thus pivoting the knock-off lever 62 on post 66. Continued movement of crank 14 permits the sear 61 to drop in back of the pin 6las seen in FIG- URE 4 thus loading the picking spring and holding the picking lever in the cockedposition. During this operation the trigger rod 53 has been moved to the left as seen in FIGURE 3 to fire the lefthand picking lever and throw the shuttle from left to right.

Picking crankshaft 14 on the right side of the loom and picking crankshaft 15 on the left side of the loom are driven in suitable timed relation to the movement of the lay and harness frames. These two picking crankshafts are driven from the. bottom back camshaft of the loom and the ratio between the camshaft and picking shafts is 2:1. In other words, the picking crankshafts 14 and 15 turn at half speed with respect to the bottom back camshaft.

The rope motion for inserting the pile wires is well known in a conventional Wilton or velvet loom and the driving mechanism for the rope motion is timed with picking lever beingv the bottom back camshaft mentioned above and consequently both picking crankshafts. The timing cycle, as previously noted, of the picking crankshafts with re gard to the rope motion for inserting the wires is 1:1. Referring again to FIGURE 4, when the trigger pivots the picking knock-off lever to release the pin 60 from sear 61, the picking crankshaft is turned 180 from the position shown so that the picking rocker arm is pivoted to a retracted position and does not interfere with the firing or snapping of the picking lever. FIGURE 2 shows the position of the picking lever and the rocker arm just after firing and with the flat face of the picking lever against the bumper 70. The lefthand picking motion actuated by picking crankshaft 14 is identical to that just described in conjunction with the righthand picking motion, and it will be understood that reciprocation of the trigger rod 53 selectively loads and fires the picking levers from side to side on the loom for every insertion of a pile wire. With the lefthand picking lever 26 cocked and retained by the sear 61' on the lefthand knock-off lever 62, rocker arm 17 pivots clockwise under control of crank 15 until trigger rod 53 oscillates to the left and fires the picking lever 26 when trigger 57 displaces lefthand knock-ofl? lever 62'.

The conversion of conventional weaving equipment to single shot operation can be accomplished with a minimum of expense and downtime of the loom both on broad and narrow equipment. The operation, if desired, can be made continuous to provide the application of the laminated backing as the fabric leaves the loom which permits a further saving in cost and space.

This application is a division of application Serial No. 95,970, filed March 16, 1961.

Having thus described our invention, we claim:

In a picking motion for a pile fabric loom the improvement which comprises a picking crankshaft at each side of the loom, a picking spring mounted on a front girt of the loom, a picking lever pivotally mounted on the front girt at each end of the picking spring, a connection between each of the picking levers and the picking spring,

a picking rocker arm pivotally mounted to the loom girt at each end thereof, a crank rod connecting each picking crankshaft to its associated picking rocker arm, a knockoff lever pivotally mounted on the girt in close spaced relation to each of the picking levers, a scar on each of the knock-01f levers positioned to engage a pin on each of the picking levers whereby the picking levers are alternately cocked and released in accordance with the movement of picking cranks, journal means mounted on top of the front girt, a trigger rod slidably mounted insaid journal, a pair of adjustable triggers mounted on said trigger rod facing in opposite directions and positioned to alternately pivot each of the knock-ofi levers to suddenly unload the picking spring and pivot the picking levers and the picking sticks and throw a shuttle across the loom, a connecting rod for the trigger rod, a shade cam shaft on the loom and an adjustable crank on the shade cam shaft for actuating the connecting rod.

References Cited in the file of this patent UNITED STATES PATENTS 695,622 Naven Mar. 18, 1902 1,428,572 Wilson Sept. 12, 1922 1,704,860 Lassey Mar. 12, 1929 2,582,761 Shertz et al. Jan. 15, 1952 2,615,474 Iboney Oct. 28, 1952

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