US2382741A - Loom - Google Patents

Description

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s. P. PARKER LOOM Filed May 7. 1942 2 Sheets-Sheet 2 I/VI ENTOR 'SIZ MUEL R PAR/(ER 8 W A6 NT Patented Aug. 14, 1945 LOOM 7 Samuel P. Parker, La Grange, Ga., assignor to Callaway Mills, La Grange, Ga., a corporation of Georgia Application May 7, 1942, Serial No. 442,025

Claims.

This invention relates to looms,and, more particularly to warp stop motions for pile looms.

The invention will be described as used on a loom adapted to weave a terry fabric.

Heretofore, warp stop motions using drop wireshave been unsatisfactory when used on terry warp because of the very slight tension under which this warp operates. The usual drop wires, when used with a terry warp, are held upward by their warp threads for a small number of picks, but, after a short period of operation, the terry warp yarns sag sufficiently to allow the drop wires to move down to the position in which they are effective to stop the loom.

It is accordingly an object of this invention to provide a, mechanism to relieve the tension, applied by the drop wires, on the terry warp at regular intervals, so that stoppage of the loom as a result of sagging of the terry warp yarns rather than breakage thereof is prevented.

Other objects, advantages, and novel features of the invention will become more apparent from the following description of the illustrative embodiment shown in the accompanying drawing, in which:

Figure 1 is a perspective view of a stop motion embodying the invention as applied to a loom.

Figures 2, 3, and 4 are, respectively, front elevational, top plan, and side elevational views of the new stop motion, and Figures 5 and 6 are fragmentary sectional views showing motion in different positions.

In Figure 1, a portion of the well-known loom mechanism is shown and it includes the cam parts of the stop shaft I, center brace supports 3, a center brace 4 3 20, rigidly'attached to shaft 2I.- Shaft 2| is rotatably mounted in any desired manner. Rigidly fastened to shaft 2| is cam 22,-whose function will be described later.

A shaft 23 is provided, and is journalled at 24 and 25. A lever 26 is secured to theshaft 23,

and has pivotally attached to it a downwardly extending rod 21. Rod 2! passes through a hole in bracket 28 which is secured to the loom side,

not shown. A collar 29 is secured to rod 21 at which are bifurcated at their ends. Vertical rods 32 are pivotally secured at their lower ends to the bifurcated ends of lever arms 3|. Resting horizontally in the upper bifurcated ends of rods 32 and held into position by means of pins 33 is a contact bar 34, which cooperates with the .drop

for a group of contact bars generally designated 5, a bar separator I, a stop motion cam 8 on camshaft I, cam lever 9, levers I 0 and II and rods I2 and I3 fOr actuating knock-off lever I4, and knock-off case l5. As all this mechanism is old in the art, it will not be necessary to describe it further than to state that the usual drop Wires (not shown) are to be provided for making contact between the two members of each contact bar 5. When the drop wires are permitted to fall, as upon breakage of a strand of warp yarn, an electric circuit is closed energizing an electromagnet in case I5, which permits knock-ofl lever I 4 to engage and operate the shipper handle (not shown) to stop the loom.

The new stop motion as shown in the drawings comprises a spur gear I8, rigidly secured to one of the rotating shafts of the loom. This shaft is indicated at I9 and may be coincident with cam shaft I. Spur gear I8 drives another spur gear wires carried by the terry warp yarns.

The contact bars 5 are constructed in the usual manner with an inner metallic member insulated from an outer metallic member 36. The inner members of all the bars, except bar 34, are normallycharged and the outer members of all the bars are grounded through the loom frame. Secured at one end to an extension of the inner member of contact bar 34 is a metallic bracket 31, adapted to engage a similar extension of the inner member of contact bar 40, when the bar 34 is in its down position, and cause the inner member of bar 34 to be charged. When contact is made by one of the drop wires between the inner and outer members of bar 34, when that bar is in its down position, the loom is automatically stopped in the usual manner.

The difficulty in connection with the use ofdrop wires on the pile warp of a terry loom is well known to operators of such looms. The pile warp is under such slight tension that if drop wires and contact bars were used in the usual manner, the drop wires would gradually fall, thus stopping the loom when no break in the pile warp had occurred. It has been found that the terry warp yarns will keep the drop wires out of engagement with the contact bars during the inser-- tion of several picks in the fabric, after which the sagging of the yarns will allow the drop wires to engage the contact bars and stop the loom. Accordingly, if the pull of the drop wires on the terry warp yarns is relieved for most of the time, as, for example, during the insertion of ten out of every twelve picks, those drop wires will fall and cam 22 engages rod 21 and is so designed asto;

force rod 21 upward and hold the rod 21 in the upward position for about one sixth of a revolution of the cam 22. ward by cam 22, it rocks shaft 23 through lever arm 26, andthis causes the bifurcated end of lever arm 3| to move downward, thus carrying the contact bar 34 downward by means of rod 32. When bar 34 is in its down position, its inner member 35 becomes energized by engagement of bracket 31 with the inner member of contact bar and the drop wires associated with bar 34 are supported wholly by the terry warp yarns.

During operation, the rod 21 isin the upward position for approximately two picks of the loom,

after which time, the rod is forced downward by spring 30, rotating shaft 23 in the direction opposite to that mentioned above, thus raising conmeans for moving the bar between upper and lower positions at regularly recurring intervals,

When rod 21 is moved uptact bar 34' and disengaging it electrically from contact'bar 40 When the contact bar 34 is in its upper position, the bar engages its drop wires 4| and supports'them so that the terry warp yarns 42 are relieved'of the 'weight of the drop wires. Whenthe parts are in this relation, the drop wires bridge the inner and outer members of the contact bar, but since the inner member is not charged, the loom is not stopped. When bar 34 is in its down position and its inner member is charged byv reason of the engagement of projection 31 with the inner member of the adjacent stationary bar, the breakage of a warp yarn will permit its drop wire 4i to fall andbridge the inner and outer members of bar 34. This will cause a flow of current which will bring about the stopping of the loom.

While only one embodiment of the invention has been shown and described, it is not intended the scope of the invention be limited thereby, nor otherwisev than by the terms of the appended claims. I

What is claimed is: v i

l. A warp stop motion for a loom comprising a vertically reciprocatable contactbar, a rotatably driven cam and means operated by said cam and so constructed and arranged as to reciprocate said contact bar into and-out of operating position at regularly recurring intervals.

drop wires engaging individual warp yarns and being supported wholly thereby when the yarns are unbroken and the bar is in its lower position, the bar in its upper position supporting the wires and relieving the warp yarns of the weight of the wires, and means operable when the bar is in its lower position only for charging the inner member of the bar. v t

4. A warp stop motion for a loom, which comprises a vertically movable contact bar having an inner and an outer member insulated from one another, the outer member being grounded,

means for movin the bar between upper and lower positions at regularly recurring intervals, the bar being held in its upper positionby said means for a longer period than it is held in its lower position, drop wires engaging individual warp yarns and being supported wholly thereby when the yarns are unbroken and the bar is in its lower position, the bar in its upper position supporting the wires and relieving the warp yarns of the weight of the wires, and means operable when'the bar is in its lower position only' for charging the inner member of the bar. 5. A warp stop motion for a loom, which comprises a stationary contact bar having an inner and an outer member insulated from eachother with the outer member grounded and the inner member charged, a vertically movable contact bar adjacent the stationary bar and having an inner member and an outer member insulated from one another, the outer member ,being grounded, means for moving the movable .bar between upper andlo'wer positions, means. for electrically connecting the inner members of said bars when the movable bar is in its lower position, and drop wires engaging individual warp yarns and being supported wholly thereby when the yarns are unbroken and the movable bar is in its lower position, the movable bar in its upper position supporting thewires and relieving the warp yarns of the weight of the wires. SAMUEL P. PARKER.

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