US1799995A - Thin-place preventer for looms - Google Patents

Description

April 7, 1931. w. A. TEBO I THIN PLACE PREVENTER FOR LOOMS Filed June 12, 1929 2 Sheets-Sheet l L E i M lnvenTor.

William A.Tebo b fiw Wz M ATTy-S.

w. A. TEBO 1,799,995

THIN PLACE PREVENTER FOR LOOMS Filed June 12, 1929 2 Sheets-Sheet 2 Flg. 2.

April 7, 1931.

sz zs InvenTor.

ATTyS.

Willidm A. Tebo byw QHHHHIl IE Patented Apr. 7, 1931.

UNITED srars ATENT OFFICE WILLIAM A. 'IEBO, 013 ANTHONY, REIODE ESL AND, ASSIGNOI TO "DRALPER CORPORATION,

OF HOPEDALE, MASSACHUSETTS, A CORPORATION OF MAINE THIN-PLACE PREVENTER FOR LOOMS Application filed June 12, 1929. Serial No. 370,337.

, by failure of filling either through breakage of filling or the exhaustion of filling upon the filling carrier.

It has heretofore been customary to avoid the appearance of thin places in the cloth caused by the omission of one or more strands of filling, or by a broken strand of filling, for the operator to rub the cloth toward the fell and toward the selvage in such a manner as sli htly to spread the filling strands so that the thin place would not be clearly apparent. One of the objects of the present invention is to provide means operable upon detection of .failure of filling to stretch the clothand' thereby cause a slight rearward movement of '1 the fell which will prevent the production of a thin place because of the omission of a partial strand, or one or more strands of filling.

A further object of the invention is to provide means operable upon detection of failure of filling to stretch the cloth for the purpose above stated, comprising clamping means operable momentarily to engage the cloth, with means operable momentarily thereafter to stretch the cloth from the clamp to-the take- A further object of the invention is to provide guiding members spaced apart to direct the cloth to the take-up roll, with clamping means momentarily operable upon detection t of failure of filling to clamp the cloth upon the rearward guiding member, and means momentarily operable thereafter to move the cloth transversely between the guiding members and thereby stretch the cloth for the purpose above stated.

A further object of the invention is to provide clamping and stretching means of the character above described operable by the forward movement of the rocking layupon initiation of a change in the operation of the loom following the detection of failure of filling.

Thesev and other objects and features of the invention will more fully appear from the following description and the accompanying drawings and will be particularly pointed out in the claims.

In th-edrawings:

Fig. l is a view in side elevation of a portion of a loom embodying the invention, look- J,

ing from the center of the loom toward one side, and shown partially in vertical cross section;

Fig. 2 is a detail view of the guiding, clamping and stretching means looking toward the front of the loom on line 2-2 Fig. 1, the cloth being shown in vertical section;

Fig. 3 is a detail View of a guide plate secured to the sword of the rocking lay showing the actuator rod for the clamping and stretchmg mechanism in cross section;

Fig. 4; is a. detail view of a modified form of stretching roller; and,

Fig. 5 is an end elevation of the device illustrated in Fig. 4.

A preferred embodiment ofthe invention is shown as embodied in a usual type of loom which may be either an ordinary loom, or a filling replenishing type of loom, in which failure of filling is detected by filling fork mechanism which actuates the usual controller rock shaft. Inasmuch as the mechanism of the loom is and may be of a'usual type only so much of the 100m is illustrated as is necessary to shou the embodiment of the present invention therein.

In the construction illustrated in the drawings the loom comprises the side frames 1, a rocking lay 2 including the usual swords 3, and shed forming mechanism (not shown) from which the cloth 4 is guided to a take-up roll 5 and thence to the cloth roll 6. In the particular construction illustrated guiding members 7 and 8, preferably in the form of rollers, are mounted respectively in bosses 9 and extending upwardly from the breast beam 11, and the web of cloth is led over these guiding members thence downwardly beneath a guiding roll 12 to the take-up 5, around the take-up roll and over guiding rolls 13 and 14 and a guide bar 15 to the cloth roll 6.

The invention broadly contemplates ,the provision of mechanism operable upon initiation of a change in the operation of the loom, caused by the detection of failure of filling by a filling fork, momentarily to stretch the cloth and thereby cause a limited rearward movement or" the tell of the cloth, so that upon continuation of the weaving operation the forward movement of the lay will beat the filling firmly against the tell of the cloth. Preferably this is accomplished by providing means momentarily operable upon initiation of a change in the operation of the loom to clamp the cloth, and means momentarily operable while the cloth is so clamped to stretch the cloth between the clamping means and the take-up roll, so that when the cloth is released the resilience of the warp will draw the tell of cloth rearwardly such limited distance as to enable the filling, upon continuation of the weaving oporation to be properly beaten against the tell of the cloth, thereby avoiding the production of a thin place in the cloth.

In the particular construction illustrated a shaft 16 is mounted in suitable hearings in brackets 17 mounted upon the breast beam 11 above and intern'iediate of the guiding m mbers 7 and S. T is shaft has secured to it a nieml .r having a longitudinally extending enlargement operable upon rotation of the shaft to engage the section of cloth intermediate oi. the guiding members.

In the construction illustrated in Figs. 1 and 2, the shaft has eccentrically mounted upon and secured to it a roller 18, the eccentric portion 19 of the roller forming the enlargement which engages and stretches the cloth. The shaft 16 so mounted in relation to the normal plane of the web a: of cloth passing over the guiding members 7 and 8 as to permit the eccentric portion or enlargement of the roller to be raised above said plane during the normal operation of the loom, but upon rotation of the roller when a change in the operation of the loom is initiated to cause said enlargement to move transversely across the plane of the web of the cloth, thereby depressing the same intermediate of the guiding members 7 and 8 and imposing sullicient tension upon the cloth slightly to stretch the same.

Obviously other forms of mechanism may be provided to produce this function. One of such modifications is illustrated in Figs. 4 and 5 in which the enlargement of the roller 18 comprises a rib 19.7: which extends longitudinally of the roller and in angular relation to the axis thereof, so that as the roller is rotated the enlargement or rib 190; will progressively engage the web of cloth in a direction toward a selvage thereof, thus in a measure simulating the usual action of a weaver in smoothing and stretching the cloth by hand to avoid the production of a thin place.

Any suitable means may be provided for supporting the enlargement of the roller normally out of engagement with the cloth and for causing it to engage the cloth. In the preferred construction illustrated herein helical springs 20, which are coiled upon the end portions of the shaft 16, have offset end portions 21 engaging the brackets 17 in which the shaft is journalled. The opposite ends of the springs are oilset and extend into suitable apertures in collars 22 which are adjustably secured to the shaft 16 by set screws 23. The springs 20 are under sullicient tension normally to rotate the roller in a counterclockwise direction and the rotation of the rollers in such direction may be limited by suitable means to retain the enlargement out of engagement with the cloth.

[is illustrated herein t 1e shaft 16 has secured to it an arm which extends downwardly through a slot 25 in the breast beam 11 and the slot is of such length that when the arm engages the wall 26 at the rear end of the slot it will limit the rotary movement of the roller under the action of the springs 20, thereby holding tl e enlargement of the roller above the plane of the portion of the cloth l which extends over the guides 7 and 8.

In order to enable the cloth to be stretched a predetermined amount by the movement of the enlar ement of the roller transverselj. across the plane of the warp between the guiding members 7 and 8, means are provided for clamping the cloth rearwardly of the roller 18, so that when the enlargement 19 of the roller 18 engages the cloth it will or;- ert a tension upon the cloth which will stretch it from the take-up roll to the clamp.

In the preferred construction illustrated the clamp comprises a bar 27 which lies above and extends longitudinally of the rearward guiding member or roller 7 in 'co-operative clamping relation thereto. The bar 27 is fixedly secured in the ends of arms 28 which are provided at their opposite ends with bosses 29 which are rotatably mounted upon the shaft 16. Spiral springs 30, surrounding the shaft, are provided wi h oilset ends 31 which engage the arms 28 and also with offset ends which engage recesses in collars 32 which are adjustably secured to the shaft 16 by screws r he springs are undersuflicient tension normally to depress the clamping bar 27 toward the roller, but the downward movements of the arms 28 and bar 27 are limited by stops such as studs 34 projecting from the arms 24 into the path of the clamping arms 28, the springs being of greater strength slightly in advance of the engagement of the cloth by the enlargement 19 of the roller.

It is desirable that the stretching of the cloth required to permit a slight rearward movement of the fell ofv the cloth to prevent the production of a thin place shall take place momentarily immediately upon detection of failure of filling by the filling fork, and means are provided for accomplishing this purpose which are actuated by or through the mechanism for effecting a change in the operation of the loom upon detection of failure of filling by the filling fork. lhis preferably is effected in the particular construction illustrated by mechanism operated from the locking lay which is brought into operation by the rotation of the usual Controller rod caused bythe act-ion of the filling fork mechanism upon detection of failure of filling.

In the particular construction illustrated Elie arm 24: has pivotally connected to its lower end a rod which extends obliquely downwardly and merges into an arcuate portion 36 which is substantially concentric with the path of movement of the lay. The rod 35 is normally supported upon a stud 37 projecting from the loom side and extends through a slot 38 in a plate 39 which is secured to one of the swords 3. A hook-shaped member 40 is adjustably secured to the arcuate portion 36 of the actuating rod 35 by slot and screw connections 41 and 4:2, with the hooked portion 43 of said member extending upwardly from the rod and adapted to engage the wall at at the up or end of the slot 88 when the actuating rod is raised, so t-hatup'on beat-up of the lay the actuating rod will be moved endwise, thereby swinging the arm 24 of the roller 16 forwardly, as illustrated in dotted lines in Fig. 1, and consequently moving the enlargement 19 of the stretching. roller 16 downwardly into engagement with and transversely across the plane of the section of the cloth which supported by the guides T and 8. p

The mechanism for raising the actuating rod into operative position comprises an arm which is secured to the usual controller rock shaft 16 andextends upwardly above and across the lay and is preferably connected by a spring l7 to the rod 35.

In the operation of the loom, therefore, upon detection of failure of filling by the filling fork, thecontroller rock shaft will be ro fated by the usual filling fork mechanism in a counterclockwise direction, thereby raising the rear end of the arm 45 and through the spring 4? raising the actuating rod 35 suliiciently to causethe member 40 thereupon to be engaged by the wall 4% of the plate 39 upon the sword. As the rocking laymoves forwardly such engagement will move the actuating rod endwise, thereby causing the arm 2% of the roller to rotate the shaft 16 in a clockwise direction, first causing the clamping member 27 to engage thecloth and clamp it against the rear guide 7 and thereafter to move the enlargement 19 of the stretching roller 18 transversely of the cloth, thus de pressing the cloth intermediate of the guiding members 7 and 8 and stretching the portion of the cloth between thec'lanip' and the take-uproller. The rotative movement of the roller 18, after the engagement of the clamping member 27 with the guide 7, is permitted by reason of the fact that the arms 28 of the clamping member are rotatably mounted upon the shaft 16, with the spring 30 providing a yielding connection between the shaft 16 and the arms 28 of the clamp.

Inasmuch the actuation of the controller rod to initiate a changein the operation of the loom is momentary, the actuation of the controller shaft to establish co-operative relation between the actuating rod and the rocking lay is likewise momentary, and only effective upon a single beat-up of the lay. Therefore, upon rearward movement of'the lay the clamping mechanism will be released and the enlargement 19 of the roller 18 rotated out of engagement with the cloth and restored to normal position. The stretching'of the cloth effected by such momentary action will, therefore, permit a slight rearward movement of the fell of the cloth, so that the'next strand ofifilling will be laid properly upon thefell of the cloth. T

Having thus described the invention, what is claimed as new, and desired to be secured by Letters Patent, isz

1. A loom having means operable by a filling fork upon detection of failure. of filling to effect a change in the operation of the loom, and means operable upon initiation of such change first positively to clamp the web of cloth and then to stretch the cloth and thereby cause a limited rearward movement of the fell of the cloth to prevent the production of-a' thin place in the cloth;

2. A loom having means operable by a filling fork upon detection of failure of filling to effect a change in the operation ofthe loom, means including clamping means momentarily operable upon initiation of such change to engage the cloth and to stretch the same from the take-up roll to said clamping means'and thereby cause alimited rearward movement of the fell of the cloth to prevent the production of a thin place in the cloth Sll 3. A loom having means operable by a filling fork upon detection of failure of filling to effect a change in the operation of the loom, clamping means momentarily operable upon initiation of such change to engage the cloth, and a member momentarily movable into engagement with the cloth and trans versely thereof acting to stretch the cloth from the take-up roll to the clamping means, and thereby cause a limited rearward move- -ment of the fell of the cloth to prevent the production of a thin place in the cloth.

4. A loom having means operable by a filling fork upon detection of failure of filling to effect a change in the operation of the loom, clamping means momentarily operable upon initiation of such change to engage the cloth, and a cylindrical member having an enlargement extending longitudinally thereof momentarily rotatable into engagement with the cloth and acting to stretch the same and thereby cause a limited rearward movement of the fell of the cloth to prevent the production of a thin place in the cloth.

5. A loom having means operable by a filling fork upon detection of failure of filling to effect a change in the operation of the loom, clamping means momentarily operable upon initiation of such change to engage the cloth, and a cylindrical member having an enlargement extending longitudinally thereof and in angular relation to the axis of said cylindrical member momentarily rotatable into engagment with the cloth and acting progressively toward a selvage thereof to stretch the cloth and thereby cause a limited rearward movement of the fell of the cloth to prevent the production of a thin place in the cloth.

6. A loom having means operable by a filling fork upon detection of failure of filling to effect a change in the operation of the loom, guiding members spaced apart over which the cloth is directed to the takeup roll, clamping means co-operating with the rearward guiding member operable upon initiation of such change in the operation of the loom momentarily to clamp the cloth thereupon, and means intermediate of said guiding members momentarily movable transversely of the cloth while clamped, acting to stretch the cloth and thereby cause a limited rearward movement of the fell of the cloth to prevent the production of a thin place in the cloth.

7. A loom having means operable by a filling fork upon detection of failure of filling to effect a change in the operation of the loom, guiding members spaced apart over which the cloth is directed to the take up roll, a shaft located intermediate of said guiding members having a longitudinally extending enlargement operable upon rotation of said shaft to engage the cloth intermediate of said guiding members and move the same transversely therebetween, a clamping member mounted on said shaft in co-operative relation to the rearward guiding member, and means momentarily operable upon initiation of such change in the operation of the loom to rotate said shaft and thereby first actuate the clamping member and thereafter to cause said enlargement to engage and stretch the cloth and thereby cause a limited rearward movement of the fell of the cloth to prevent the production of a thin place in the cloth.

8. A loom having means operable by a filling fork upon detection of failure of filling to effect a change in the operation of the loom, guiding members spaced apart for directing the cloth to the take-up roll, a shaft located intermediate of said guiding members having secured thereto a cylindrical roller provided with a longitudinally extending enlargement operable upon rotation of said shaft to engage the cloth intermediate of said guiding members and to move the same transversely therebetween, clamping member rotatably and yieldably mounted upon said shaft in co-operative relation to the rearward guiding member, a spring acting upon said shaft normally to hold the enlargement of said roller and said clamp out of engagement with the cloth, and means momentarily operable upon initiation of a change in the operation of the loom for rotating said shaft in a dir ction to cause said clamping member first to clamp the cloth upon said rearward guiding memher and then to cause said enlargement to stretch the cloth and thereby cause a limited rearward movement of the fell of the cloth to prevent the production of a thin place in the cloth.

9. A loom having means including a controller rod operable by a filling fork upon detection of failure of filling to effect a change in the operation of the loom, guiding members spaced apart for directing the cloth to the take-up roll, a shaft located intermediate of said guiding members having secured thereto a cylindrical roller provided with a longitudinally extending enlargement operable upon rotation of said shaft to engage the cloth intermediate of said guiding members and to move the same transversely therebetween, a clamping member rotata-bly and yieldably mounted upon said shaft in co-operative relation to the rearward guiding member, a spring acting upon said shaft normally to hold the enlargement of said roller and said clamp out of engagement with the cloth, an arm on said shaft, an actuator rod pivotally connected to said arm, a rocking lay, co-operatmg means on said actuating rod and said lay normally disengaged, and means actuated by the rotation ofsaid controller rod upon initiation of a change in the operation of the m to effect engagement between said co-operating means and upon forward movement of the lay to rotate said shaft momentarily to cause said clamping member first to clamp the cloth upon the rearward guiding member and then to cause the enlargement to stretch the cloth and thereby cause a limited rearward movement of the fell of the cloth to prevent the production of a thin place in the cloth.

In testimony whereof, I have signed my name to this specification.

WILLIAM A. TEBO.

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