US2082678A - Automatic-loom shuttle - Google Patents

Description

June 1, 1937. Q BRlERLEY 2,082,678

AUTOMATIC LOOM SHUTTLE Filed April 30, 1936 2 Sheets-Sheet 1 I I l .I 1 23 22 1,7 2/ I! ATTO RNEY S INVENTOR June 1, 1937. c. E. BRIERLEY AUTOMATIC LOOM SHUTTLE Filed April 50, 1936 2 Sheets-Sheet 2 INVENTOR ATTO RN EYS Patented June 1, 1937 UNITED STATES PATENT OFFICE AUTOMATIC-LOOM SHUTTLE Claude E. Brierley, Utica, N. Y.

Application April 30, 1936, Serial No. 77,216

9 Claims.

My present invention relates to a shuttle for an automatic loom.

The purpose of this invention is to provide a new and improved shuttle for an automatic loom and particularly to provide a shuttle having means for preventing the escape of a wad or gathering of waste yarn from the bore of the bobbin carried by the shuttle. In automatic looms such as the Draper looms for weaving cotton cloth the shuttles are of the type which hold the bobbin rigidly within the shuttle without the use of a pivot spindle projecting into the bore of the bobbin, but the bore within the large end of the bobbin is necessary for the operation of winding the yarn upon the bobbin. As an incident to the winding of the yarn upon the bobbin by the use of'the usual machinery employed therefor waste cotton yarn or filling is very apt to accumulate within the bore of the bobbin. These balls or wads of cotton waste often stay within the bore of the bobbin until the bobbin has been placed into the shuttle of the automatic loom and then the usual violent reciprocation of the shuttle and the bobbin carried therein incident to the weaving operation loosens the ball of waste yarn enough to let it escape from the open end of the bore of the bobbin whereupon it drops from the shuttle and lodges between the two separated series of the warp threads or shed. After it is thus deposited between the set of warp threads or shed the subsequent movements of the loom and the subsequent threads of'filling added to the cloth by the loom hold the ball of waste within the I length of cloth being woven. The motion of the shuttle is apt to distribute the portion of waste some little distance crosswise of the cloth but the amount of waste thus enclosed within the cloth is usually sufiicient to make a serious and noticeable defect in the cloth which cannot be remedied by removing the waste yarn from the fabric because the inclusion/of the waste within the cloth makes such a luinp within the fabric as to distort both the/ warp threads and the filling threads so that they would not go back into place even if the I otton waste could be removed. It will be understood that in practice these automatic looms operate so rapidly that several threads of filling would be inserted into the fabric before the weaver could notice the defect and stop the loom even if he were watching the formation of the fabric at the instant the portion of waste was deposited within the cloth. Actually, however, the weaver hardly ever is able to see one of these defects when it is made for the reason that with these automatic looms one weaver is in charge of a considerable number of looms and does not see the defect until it has been made some time or he may not see the defect at all. In that case the defect is not discovered until the cloth is inspected in the usual course of the operations of the mill.

A piece of cloth having one of these waste defects is defective and cannot be used as first grade cloth so that a section of cloth bearing 10 one of these defects is cut from the length of cloth which of itself entails some loss of cloth. The more serious loss of cloth, however, is brought about through the fact that this cloth is used largely for the making of sheets and pillow cases requiring extended lengths of cloth to cut economically. In practice if these defects caused by waste dropping into the cloth occur too close to one another, the whole length of such cloth between the defects is reckoned as not first class cloth for such things as sheets and pillow cases because it will not satisfactorily cut into lengths A for making those articles. It will thus be seen that the occurrence of these waste cotton defects in this class of cloth and upon this class of automatic looms results in a very considerable loss of material and loss of quality and acceptability in the market.

It is the main object of this invention to provide a shuttle having means to prevent the escape of such cotton yarn waste from the bobbin while it is within the shuttle in the loom and at the same time to have such means of simple and effective form and so formed as not to require any addition or change in the loom nor 3r any change upon the bobbin nor upon the shuttle nor addition thereto except the addition of a simple guard spring to the shuttle that will not otherwise interfere in any way with the operation of the shuttle or bobbin nor the action of the loom.

Further advantages and purposes of this invention will appear from the specification and claims herein.

Fig. l is a top or plan view on a small scale of an automatic loom shuttle equipped with this improvement and carrying a bobbin of the usual type employed therewith.

Fig. 2 is a top or plan view on an enlarged scale of the left hand end of the shuttle shown in Fig. 1; that is of the end of the shuttle which holds the enlarged or butt end of the bobbin.

Fig. 3 is a central vertical sectional view on line 3-3 of Fig. 2, said view showing the shuttle and bobbin in its normal operative position and showing also a piece of cotton yarn waste near the open end of the bore of the bobbin.

Fig. 4 is a view similar to Fig. 3 but showing in connection with the shuttle the adjacent part 5 of the loom which supports the shuttle at the end of its travel and showing also two bobbins in connection with the shuttle in the position they occupy when the incoming bobbin has been placed on top of the old and exhausted bobbin and the 10 old bobbin is being pushed down through the shuttle, the guard spring being shown temporarily depressed by contact therewith of the upper part of the outgoing bobbin.

Fig. 5 is a detail sectional view similar to a part 15 of Fig. 4 but showing the two bobbins in a slightly different relative longitudinal position.

Fig. 6 is a perspective view of the spring guard and heel spring as shown in the preceding views. Fig. 7 is a perspective view of a heel spring and 20 a modified form of resiliently mounted guard member embodying my invention.

Figs. 8 and 9 are side elevations of said modified form showing the guard member extended in Fig. 8 and retracted in Fig. 9.

Referring to the drawings in a more particular description it will be seen that the automatic loom shuttle illustrated is of the type wherein the shuttle I has a centrally arranged longitudinally extending bobbin-receiving aperture l I which 30 extends entirely through the shuttle from top to bottom and is longer and wider than the bobbin t2 so that the bobbin may be placed in position in the shuttle by being pressed down into the shuttle from above and so that that bobbin in turn 35 when empty may be ejected through the bottom of the shuttle aperture II by another bobbin being pushed against the old bobbin from above.

As the parts are illustrated herein the en-' larged or butt end l3 of the bobbin [2 is at the 40 left hand end of the shuttle aperture 'and the bobbin is held in position in the shuttle by the usual plurality of tight metal rings I4 upon the butt end of the bobbin being engaged by the recesses l upon the inner surface of the two 45 opposite fingers l6 of the bobbin-holding clip. It will be understood that this clip is securely fastened in the left hand end of the shuttle with the fingers l6 projecting to the right or into the adjacent portion of the main aperture H of the j 50 shuttle. As is usual with this type of shuttle for automatic looms, the fingers 16 are slightly resilient and the recesses l5 in. the inner faces thereof are preferably concave in their vertical dimension so that the outwardly projecting part 55 of the metal rings I4 first can; the-fingers apart when the butt end of the bobbin is forced down into the fingers and the curved form of the recesses l5 automatically operates to hold the bobbin in the proper central position. Similarly 60 when the exhausted bobbin is to be ejected it is pushed downwardly by the incoming bobbin, such downward pressure upon the lower bobbin temporarily springing the fingers l6 apart.

In automatic loom shuttles of this type there 65 is provided in this left hand end of the shuttle what is commonly termed a heel spring ll arranged to slant towards the right as it extends downwardly. This spring is held in position by its usual integral tongue l8 resting upon a re- 70 cessed flat seat 19 formed in the wood of the shuttle and with said tongue commonly fastened to the shuttle by a screw 20 extending downwardly through the tongue of the heel spring into the adjacent portion of the shuttle. Commonly just below the slanting portion of the heel spring l1, there is a short substantially vertically arranged portion 2| from the lower end of which there extends to the left an integral arm 22 resting upon the face 23 in the shuttle so that the arm 22 is substantially parallel with the fixed tongue I8. It will be understood that the purpose of this heel spring I! is to provide a slightly resilient downwardly sloping cam face which operates to force the bobbin to the right slightly beyond the said heel spring in case the bobbin when shot down into the shuttle was not in proper longitudinal position relative to the shuttle.

The bobbin or filling-carrier I2 when on'ce placed in position in the shuttle remains fixed in position in the shuttle by the grip of the spring fingers l6 upon the rings I4 fixed upon the periphery of the butt end l3 of the bobbin. In

other words, in this type of shuttle the bobbin' does not rotate upon a spindle projecting into the bore 24 which extends into the butt end of the bobbin. This bore in the bobbin, however, has to be retained for mounting the bobbin upon the spindle in the spinning frame where these bobbins have the cotton yarn wound upon them.

As already mentioned, during the machine operation of winding the cotton yarn upon the bobbins it happens that quite occasionally waste yarn gets into the bore 24 of a bobbin and accumulates there and remains in place therein until the bobbin is once more in the shuttle of a loom. Then the violent reciprocation. of the shuttle and bobbin incident to the weaving operation tends to dislodge the waste yarn and make it come out of the mouth of the bore of the bobbin and drop into the fabric which is- In order to overcome this objection and provide means to prevent the escape of these balls 44 of cotton waste while the bobbin is in the shut tle, I provide upon the shuttle adjacent the end of the aperture which receives the butt end of the bobbin a yielding member or resiliently mounted guard, the extremity of which ordinarily projects slightly into the mouth of the bore 24 of the bobbin and a part of said memberor guard yieldingly engages the adjacent butt end of the bobbin with a camming action so as to cause the retreat of the projecting extremity of the guard from the path of the bobbin when the bobbin is being placed in the shuttle or is being ejected therefrom.

In the drawings herein I have illustrated and will first describe in detail the preferred form of this guard member, but it will be understood that such illustration and specific description is only illustrative of the preferred form of my invention and that my invention may be carried out in other ways than those herein shown without departing from the spirit and essential characteristics of the invention as set out in the claims herein.

This preferred form of said guard member comprises a guard spring 25 preferably in the form of a leaf spring consisting of a lower extremity 26, a slanting cam portion 21 and a horizontal arm 28 extending back to the left from said cam portion as the parts are seen in Figs.-3 and 4. Said spring guard is conveniently formed with all its parts integral by forming the same out of a length of .thin spring steel. As the almost universal practice in these shuttles for automatic looms is to use a heel spring I! having a slanting cam face connected above to the heel spring tongue 3 and below to the short vertical portion 2|, I have shown my guard spring 25 as having its cam portion 21 corresponding in length to the cam portion of the heel spring and as hav- 5 ing a horizontal arm 28 of the guard spring lying directly upon and preferably even countersunk into the tongue l8 of the heel spring and secured to the underlying portion of said tongue as by welding or other suitable means. Prefer- 10 ably also the extremity 26 of the guard spring which is to normally project into the mouth of the bore 24 of the bobbin has a short downwardly bent tip at an angle to the cam portion 21 of the guard spring corresponding to the angle between the heel spring I! and itsvertical portion 2 I.

As will be seen particularly from Fig. 3 the parts of. this guard spring are so constructed and mounted that the cam portion 25 normally slants away from the cam portion I! of the heel.spring as it goes downward when the parts are in normal position and the lower extremity of said cam portion 21 and the sharply downturned tip 29 at its lower end project to an appreciable extent into the mouth of the bore of the bobbin. According- 25 ly the extremity 26 including the lower end of the cam portion 21 and the downturned tip 29 form a guard normally occupying a considerable area at the mouth of the bore of the bobbin sufficient in size and vertical and lateral extent to effec- 0 tively prevent the escape of balls 44 of waste cotton yarn from said bore while the bobbin is in the shuttle. To the extent that the guard spring 25 projects into the mouth of the bore of the bobbin and also to the extent if any that any particular bobbin may come towards the shuttle too far to the left, the said cam portion 21 and the extremity 26 of the guard spring will be in the path of the butt end of the bobbin as it comes into the shuttle and also as it leaves the shuttle. The resilient character and form of the guard spring allows the movable end of said guard spring to be temporarily moved out. of the vertical path of the incoming or outgoing bobbin by the automatic engagement with the cam portion 21 of the guard spring by the lower portion of the butt end of the bobbin when a bobbin enters the shuttle and by the automatic engagement of the portion of the butt end'of the bobbin immediately above the mouth of the bore of the bobbin when the bobbin is ejectedfrom the shuttle.

This retracted position of the guard spring is shown particularly in Fig. 4 wherein the cam portion 21 of the guard spring is lying flat against the cam portion of the heel spring I! and the downturned tip 29 of the guard spring is shown aslying flat against the vertical portion 2| of the heel spring. In Fig. 4 this retracted position of the guard spring has been brought about automatically by the engagement of the upper half of the butt end of the bobbin with the cam portion 21 of the guard spring due to the lower bobbin shown in said view being in the position it occupies while in the process of being ejected from the shuttle.

In Fig. 4 the lower and outgoing bobbin is shown as partly ejected downwardly from the shuttle and as entering the aperture 30 provided in the bottom 3! of the lay end of the loom. The upper and incoming bobbin shown in Fig. 4 is shown in the position it occupies directly over the outgoing bobbin when the incoming bobbin is projected down upon the top of the outgoing bobbin and being pressed down thereagainst by the hammer or transfer 32 bearing upon the 75 butt end of the upper bobbin and by the fork 33 straddling and bearing down upon the smaller diametered portion of the bobbin to the right of its butt end. Said fork 33 projects downwardly from a horizontally disposed arm 34 projecting to the right from the hammer or transferer 32.

It will be understood that the guard spring 25 is very thin and relatively light but very quick or active in its resiliency. The guard spring is made thus very thin in order not to affect the action of the loom nor the automatic ejection of the old bobbin nor the introduction of the new bobbin into the shuttle. The light action of the guard spring 21 it will be understood does not affect the downward movement of the bobbin being ejected nor the straight downward movement of the incoming bobbin from the battery containing the loaded bobbins as the downward movement given to the incoming bobbin is given with sufficient power not to be affected by the slight resilient actionof the guard spring 25. On the other hand the guard spring 25 as already noted is adapted to lie flat against the cam portion or slanting portion of the heel spring itself ll. This action results in any strain being removed from the light guard spring 25 and being placed upon the heel spring I! which is heavy and well reinforced for the very purpose of camming the bobbin tothe right if required when it comes down into the shuttle. At the same time the downturned tip 29 of the guard spring lies fiat against the vertical portion 2| of the heel spring and thus enables said tip of the guard spring to be clear of the moving bobbin and free of strain from either the incoming or outgoing bobbin.

Figs. 4 and 5 also illustrate how my guard spring can effectively operate during the refilling of the shuttle by a new bobbin in either of the two slightly different relative positions of the outgoing and incoming bobbin.

It will be understood that the rings i4 rigidly secured upon the butt endof the bobbins are the parts of the butt ends of the'bobbins that engage when an incoming bobbin isforced down upon the bobbin already in the shuttle. As the new bobbin comes down upon the old bobbin the engaged faces of the two sets of rings and the power transmitted from the hammer transferer 32 to the upper bobbin causes the upper bobbin to slide slightly to the right or to the left until the two sets of rings interlock as far as they can go. In Fig. 4 of the drawings the upper bobbin is shown as hav ing been thus slightly forced to the right. With the parts in this position continuous downward movement imparted to the two bobbins by the hammer transferer 32 will carry the lower and old bobbin past the heel spring and the guard spring and let the old bobbin fall through the lower part of the bobbin aperture I l and through the aperture 30 in the bottom of the lay end of the loom. At the same time the incoming bobbin is being forced downwardly and its rings force the fingers iii of the clip I'lapart until the incoming bobbin comes to its desired central position in the shuttle. During this downward movement of the incoming bobbin the guard spring 25 will, assuming the two bobbins are in the position shown in Fig. 4, at its lower end move slightly towards the right while the lower half of the butt end of the bobbin is going past the tip 29 but as soonas the incoming bobbin has been brought nearly to its fixed position the movable end of the guard spring will at once spring to the right and occupy the mouth of the bore as shown in Fig. 3.

It will be obvious that if the relative longitudinal position of the old and incoming bobbins was the reverse of that shown in Fig. 4, the upper bobbin would as appears in Fig. 5 project to the left slightly beyond the lower bobbin and the 5 lower half of the butt end of the incoming bobbin would have a more positive and direct engagement with the cam portion 21 of the guard spring and said guard spring would not start toward its outer position until the incoming bobbin had nearly reached its ultimate position. It is obvious also that when a shuttle is first loaded with a bobbin the lower half of the butt end of the bobbin would engage the cam portion 21 of the guard spring and automatically move the guard spring from the path of the incoming bobbin until said bobbin nearly reached its central and ultimate position in the shuttle.

In Figs. 7 to 9 there is illustrated a modified form of guard member namely a guard member proper 35 resiliently mounted upon the heel spring and yieldingly normally extended by means of a leaf spring 33. In this modified form the slanting cam portion 31 of the heel spring is cut away forming a slot midway the width of the said heel spring and in this slot is mounted the guard member 35. The guard member at its upper end is hinged to the adjacent portion of the heel spring as by having the upper extremity of the guard member bent to encircle a hinge pin 39 suitably supported at its ends in straps 40 upon the rear side of the heel spring. From the opposite sides of the lower part of the guard member wings M project inwardly through the bottom part of the slot in the heel spring and the extreme edge of each of these wings is provided with an ear 62 projecting outwardly so as to engage the rear face of the heel spring to form a stop limiting the outward swinging movement of the guard member under the constant tension of the leaf spring 36. This leaf spring has its upper and left hand end suitably fastened to the under surface of the tongue 43 of the heel spring. The lower part of this spring bears against the lower side of the guard member between the said wings and exerts a tension tending to press said guard member outwardly from the heel spring. It will be seen that this yieldingly mounted guard member will normally project into the mouth of the bore of a bobbin in the shuttle as already described in detail with regard to the other form of guard member namely the guard spring. It will be seen also that the slanting outer face of the guard member 35 will form a cam to be engaged by the downward movement of the bobbin and so automatically retract the guard member from the mouth of the bobbin and from the path of the bobbin when the bobbin is either being inserted in the shuttle or ejected therefrom.

What I claim as new and Letters Patent is:

1. In an automatic-loom shuttle, the combination of a shuttle having a bobbin-receiving aperture extending from top to bottom of the shuttle, means on the shuttle adjacent one end of said aperture for laterally engaging and detachably holding the butt end of a bobbin having an openended bore in its butt end and adapted to receive the spindle of the spinning frame, and a separate, very lightly-tensioned guard spring projecting from the shuttle into the same end of the aperture in a downwardly slanting direction and having its lower portion normally entering the open end of the bore of a bobbin in the shuttle desire to secure by and preventing the escape of waste fromthe bore, said guard spring being adapted to readily but temporarily yield and retreat from the path of the bobbin upon engagement with said slanting portion by the adjacent end of a bobbin entering or leaving the shuttle.

2. In an automatic-loom shuttle, the combination of a shuttle having a bobbin-receiving aperture extending from top to bottom of the shuttle, means on the shuttle adjacent one end of said aperture for laterally engaging and detachably holding the butt end of a bobbin having an open-ended bore in its butt end and adapted to receive the spindle of the spinning frame, and a separate movably mounted and lightly spring-tensioned guard projecting from the shuttle into the same end of the aperture in a downwardly slanting direction and having its lower end normally yieldingly positioned adjacent the open end of the bore of said bobbin and preventing the escape of waste from the bore, said lower end of the guard being adapted means on the shuttle adjacent one end of said aperture for exteriorly engaging and detachably holding the butt end of a bobbin having an openended bore in its butt end, and a resiliently mounted guard projecting from the shuttle into the same end of the aperture in a downwardly slanting direction and having its lower end provided with a downturned extension normally yieldingly positioned adjacent the open end of the bore of said bobbin and preventing the escape of waste from the bore, said lower end of the guard being adapted to temporarily yield and retreat from the vertical path of the bobbin upon engagement with the slanting portion of said guard by the butt end of a bobbin which is entering or leaving the shuttle.

4. In an automatic-loom shuttle, thecombination of a shuttle having a bobbin-receiving aperture extending from top to bottom of the shuttle, means on the shuttle adjacent one end of said aperture for exteriorly engaging and detachably holding the butt end of a bobbin having an openended bore in its butt end, a heel spring adjacent the same end of the aperture and having a cam portion slanting downwardly and outwardly into the aperture and a guard spring mounted in said shuttle and having its movable portion-nor-- mally spaced from the cam of the heel spring and slanting downwardly and outwardly with its lower end normally adjacent the mouth of the bore of a bobbin in the shuttle and preventing the escape from said bore of waste located therein, the movable portion of said guard spring being automatically swung towards the heel spring cam and out of the vertical path of the bobbin by a bobbin being inserted in or removed from the shuttle.

5. In an automatic-loom shuttle, the combination of a shuttle having a bobbin-receiving aperture extending from top to bottom of the shuttle, means on the shuttle adjacent one end of said aperture for exteriorly engaging and detachably holding the butt end of a bobbin having an open-ended bore in its butt end, a heel spring adjacent the same end of the aperture and having a cam portion slanting downwardly and outwardly into the aperture and a guard spring mounted in said shuttle and having its movable portion normally spaced from the cam of the heel spring and slanting downwardly and outwardly with its lower end normally projecting into the mouth of the bore of a bobbin in the shuttle and preventing the escape from said bore of waste located therein, the movable portion of said guard spring being automatically swung towards the heel spring cam and out of the vertical path of the bobbin by a bobbin being inserted in or removed from the shuttle.

6. In an automatic-loom shuttle, the combination of a shuttle having a bobbin-receiving aperture extending from top to bottom of the shuttle, means on the shuttle adjacent one end of said aperture for exteriorly engaging and detachably holding the butt end of a bobbin having an open-ended bore in its butt end, a heel spring adjacent the same end of the aperture and having at its upper end a tongue fastened to the shuttle and adjacent thereto, a cam portion slanting downwardly and outwardly into the aperture and a guard sprinhaving its fixed end secured to the tongue of the-heel spring and having its movable portion normally spaced from the cam of the heel spring and slanting downwardly and outwardly with its lower end normally adjacent the mouth of the bore of a bobbin in the shuttle and preventing the escape from said bore of waste located therein, the movable portion of said guard spring being automatically swung. towards the heel spring cam and out of the vertical path of the bobbin by a bobbin being inserted in or removed from the shuttle.

7. In an automatic-loom shuttle, the combination of a shuttle having a bobbin-receiving aperture extending from top to bottom of the shuttle, two oppositely disposed spring fingers at one end of said aperture for exteriorly engaging and detachably holding the butt end of a bobbin having an open ended bore in its butt end to receive the spindle of a, spinning frame, a stifl bobbin guide having a cam sloping downwardly between said fingers and adapted to engage the butt end of an incoming bobbin and thereby force the bobbin lengthwise into proper relation to said fingers, a resiliently mounted guard having a portion normally slanting outwardly from said guide cam as it extends downwardly with its lower end positioned adjacent the open end of the bore of said bobbin and preventing the escape of waste from the bore, the portion of the guard projecting away from the stiff guide cam being adapted to easily and temporarily swing towards said guide cam and from the downward path of the bobbin upon the butt of an entering or a leaving bobbin engaging the slanting portion of said guard.

8. In an automatic-loom shuttle, the combination of a shuttle having a bobbin-receiving aperture extending from top to bottom of the shuttle, two oppositely disposed spring fingers at one end of said aperture for exteriorly engaging and detachably holding the butt end of a bobbin having an open-ended bore in its butt end to receive the spindle of a spinning frame, a stiff bobbin guide having a cam sloping downwardly between said fingers and adapted to engage the butt end of an incoming bobbin and thereby force the bobbin lengthwise into proper relation to said fingers, a lightly-tensioned spring guard having a portion normally slanting outwardly from said guide cam as it extends downwardly with its lower end positioned adjacent the open end of the bore of said bobbin and preventing the escape .of waste from the bore, the portion of the guard projecting away from the stiif guide cam being adapted to easily swing towards said guide cam and from the downward path of the bobbin upon the butt of an entering or a leaving bobbin engaging the slanting portion of said guard.

9. In an automatic-loom shuttle, the combination of a shuttle having a bobbin-receiving aperture extending from top to bottom of the shuttle, two oppositely disposed spring fingers at one end of said aperture for exteriorly engaging and detachably holding the butt end of a bobbin having an open ended bore in its butt end to receive the spindle of a. spinning frame, a stiff bobbin guide having a cam sloping downwardly between said fingers and adapted to engage the butt end of an incoming bobbin and thereby force the bobbin lengthwise into proper relation to said fingers and having a vertical portion at the lower end of said cam, a lightlytensioned spring guard having a portion normally slanting outwardly from said guide cam as it extends downwardly with its lower end depending vertically and normally positioned in the open end of the bore of said bobbin and preventing the escape of waste from the bore, the portion of the guard projecting away from the stiff guide cam being adapted to easily and temporarily swing towards said guide cam and from the downward path of the bobbin upon the butt of an entering or a leaving bobbin engaging the slanting portion of said guard, extreme retreating motion of said spring guard bringing its slanting portion flat upon the cam of the guide and its depending end against the said lower vertical portion of the guide whereby the stifi guide supports the spring guard and prevents its being distorted.

CLAUDE E. BRIERLEY.

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