US1398532A - Stop mechanism for looms - Google Patents

Description

H. W. YOUNGQUIST.

STOP MECHANISM FOR LO OMS. APPLICATION FILED suL'v 2. 1921.

1,398,532. Patented Nov, 29, 1921.

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STOP MECHANISM FOR LOOMS.

APPLICATION man JULY 2, 1921.

1,398,532; Patented Nov. 29, 1921.

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HENRY W. YOUNGQUIST, OF MANCHESTER, NEW HAMPSHZBE, ASSIGNOR TO DRAPER CORPORATION, OF HOEEDALE, MASSACHUSETTS, A CORYOB-ATION OF MAINE.

sror MECHANISM FOR LOOMS.

To all whom it may concern:

Be it known that I, HENRY WV. YOUNG- UIsT, a citizen of the United States, and resident of Manchester, county of Hillsborough, State of New Hampshire, have invented an Improvement in Stop Mechanism for Looms, of which the following description, in connection with the accompanying drawing, is a specification, lik characters on the drawing representing like parts.

This invention relates to improvements in stop mechanisms for looms and the principal object thereof is to provide means operable by an abnormal variation in the tension of the warps passing over the whip roll to effect a stoppage of the loom.

In usual loom constructions warp stop mechanisms are provided which comprise a series of detectors each of which is suspended upon' a warp, all of said detectors being located above the reciprocating feeler which, when arrested by the dropping or letting down of a detector, will initiate the action of mechanism for effecting the stoppage of the loom. Thus the usual warp stop mechanism provides for a stoppage of the loom upon the breakage of a warp or if the tension upon the warp becomes so low as to permit one or more of the detectors to engage and arrest the reciprocating feeler. It is found that in weaving certain classes of goods an abnormally high tension upon the warp is apt to cause a defect in 'the weaving, such asa thin place, and the object of the present invention is to provide means, operable by, an abnormal variation in the tension, usually an excessive amount of tension, to cause a stoppage of the loom.

More specifically the invention comprises means operable by an abnormal movement of the whip roll, caused by a variation in the tension of the warp, to initiate the action of the usual warp stop motion of the loom to effect a stoppage of the loom.

In the present embodiment of the invention the action of the stop motion is initiated by a latch which is controlled by the movement of the whip roll and upon excessive movement of the latter is caused or' permitted to drop into the path of the reciproeating feeler of a usual warp stop motion.

A preferred embodiment of the invention is illustrated in the accompanying drawings as applied to the well known Northrop Specification of Letters Patent.

. Patented Nov. 29, 1921. 1921. Serial no. 482,036.

Fig; 3 is a detail plan view of thesame, I

Fig. 4 is a detail view in perspective of one of the bracket arms which support the shaft uponwhich the latch is mounted,

showing the cam surfaces carried by said bracket; and, v s

Fig. 5 is aperspective view ofthe shaft operating arm having cams adaptedto cooperate with those upon the bracket.

The loom illustrated in the accompanying drawing is of a usual type having loom sides 1, the usual lay 2 and means for actuating the same, a warp beam 3 from which the warp passes over a whip roll 4 across the usual leash rods 5 through harnesses '6 and thence through the reed 7 on the layto the fell of the web of'cloth being woven. The

loom also comprises a usual type of warp stopmechanism in which two parallel series of detector'bars 8 and 9 are supported upon the warps between the leash rods 5'. The detectors 8 and 9 are guided respectively by detector bars 10 and 11 and are adapted, when released by the breakage or undue slackness of the warp, to drop into the path of the feeler 12 between said feeler and the stop plate 13 or 14, thereby arresting the movement of the feeler and causing the initiation of the action of means for effecting the stoppage of the loom; Any suitable means may be utilized in so far asthe present invention is concerned. In the particular mechanism which is'illustrated herein the feeler 12 is carried by a rock shaft 15 havinv arms which are connected by rods 16 and 1 to actuating arms 18 and 19 which are mounted upon a rock shaft 20 carried by a boss or extension 21 of a link 22 which I is provided with a hook-shaped end 23 embracing the cam shaft 24. The actuator arms 18 and 19 are oscillated by a cam follower 25 engaging the cam 26 on said rock shaft. Tappet arms 27 and 28 are resiliently connected respectively-to the actuating arms 18 and 19 and are normally oscillated by the cam follower 25 out of the path of tappets 29 and 30 carried by the cam shaft.

In the normal operation of the loom the feeler is oscillated back and forth beneath the detector bars. When, however, one or more of the detector bars is released by the breaking or sagging of the warp and drops into the path of the feeler the movement of the feeler is arrested thereby causing one of the tappet arms 2 7 or 28 to be held in the path of the tappet 29 or 30 so that the rotation of the cam shaft 24 causes the tappets 29 or 30, upon engagement with the tappet arms 27 or 28, to move the link 22 endwise.

The opposite end of the link 22 is connected to the lower end of a shipper actuating lever 31 which is pivotally mounted upon a stud 32 carried by the loom frame;

and is provided with a cam slot 33 engaging a shipper lever 34. hen the shipper actuating lever 31, therefore, is oscillated by the end-wise movement of the link 22 it throws the shipper out of engagement with its usual retaining slot and causes the stoppage of the loom in the manner well known to those skilled in the art.

The 'mechanism thus described may be and is of the type disclosed in Patent No. 673,824, Stimpson, May 7, 1901.

In the present invention means are provided for arresting the reciprocation of the feeler 12 when the tension upon the warp is varied beyond a predetermined amount. The means for thus arresting the reciprocation of the feeler may be actuated either by too great a tension upon the warp or too slack a tension upon the warp as will be readily understood. The means illustrated herein, however, are adapted to be actuated upon an excessive tension upon the warp by an abnormal movement of the whip roll caused by said excessive tension.

In the present construction the shaft 35 of the whip roll 4 is seated in journals 36 in arms 37 which are rigidly secured to a rock shaft 38 journaled in suitable bearings in brackets 39 carried by the loom side. 1m arm 40 also fixedly secured to the rock shaft 38 is pivotally connected at its free end to a. rod 41 slidably mounted in a bearing in a bracket carried by the loom side (not shown). A spring 42 is interposed between said bracket and a collar 43 upon the rod 41 and acts normally to cause said whip roll to exert a tension upon the warp passing from the, warp beam over it to the shed forming mechanism of the loom.

7 It will thus be obvious that the whip roll will move through an are about the axis of the rock shaft 38 as the tension upon the warp passing over it varies. This movement of the whip roll under the varying tension of the warp is utilized in the present invention to actuate means for arresting the feeler of the warp stop motion and thus causing a stoppage of the loom when-an abnormal tension is placed upon the warp.

' The preferred mechanism for thus arresting the feeler which is illustrated in the accompanying drawing comprises a latch 43 having a hook-shaped end 44 normally located above the path of the reciprocating feeler 12. The latch 43 desirably is pivotal ly mounted upon a shaft 45 which is slida-bly mounted in ournals 46 and 47 of a bracket 48 carried by the loom side. The latch 43 desirably is engaged on one side by a frictional washer 49 abutting against a non-rotatable washer 5O adjustably secured upon the end of said shaft by nuts 51' and is engaged upon the opposite side by a frictional washer 52 which is seated against the outer end of the bearing 46 for said shaft. The frictional Washer 49 is forced into engagement with the latch 43 by a helical spring 53 mounted upon the shaft 45 and abutting at one end against the opposite'side of the bearing 46 and at its other end against an actuating arm 54 which is, rigidly secured to the shaft 45 by a set screw 55. By reason of this construction the latch may be held many desired position so long as the frictional clamping means are forced into engagement with it by the action of the spring 52.

Any suitable means may be providedfor releasing the latch upon an abnormal variation of the tension of the warp. In the construction illustrated in the drawings the actuating arm 54 is provided with preferably a plurality of cams 56 whichengage cooperating cam surfaces 57 upon the bracket- 47 in which the shaft 45 is journaledi The cams 56 and 57 are so arranged that an oscillatory movement of the actuating arm 54 will cause a longitudinal movement of the shaft, thereby releasing the engagement of said frictional means with the latch 43 so that the latter will be released and free to drop. V

The actuating arm 54 is connected to a rod 58 which is slidably mounted in a boss 59 on the bracket 48 and its free end lies in the path of an adjustable abutment 60 which is carried by an arm 61 fixedly secured to the rock shaft 38.

As illustrated'herein the rock shaft arm 61 is provided with a semi-circular portion 62' which partially embraces the rock shaft and a complementary semi-circular member 63 which are clamped upon the rock shaft by bolts 64. 1

Any suitable means may be provided for adjusting the abutment 60. As illustrated, the abutment 60 comprises the head of a screw 65 which is adjustably seated'in the arm 61 and is adapted to be held in adjusted positions by a lock nut 66 abutting against said arm.

In the operation of the device the Whip roll 4 will be oscillated more or less under variations of tension upon the warp which passes over it. lVhen an excessive tension is imposed upon the warp the whip roll will be forced downwardly thereby rocking the shaft 38 and causing the arm 61 to force the abutment 60 into engagement with the end of the rod 58. This will move the rod 58 endwise and thereby rock the actuator arm 54, thus causing the cams 56 and 57 to force the rock shaft endwise. This endwise movement of the rock shaft releases the engagement between the frictional washer 49 and the latch 43 and permits the hooked end of the latter to drop into the path of the feeler 12, thereby arresting its movement and causing an initiation of the action of the warp stop mechanism to efiect a stoppage of the loom,

It will be understood that the particular embodiment of the invention disclosed herein is of an illustrative character and is not restrictive and that various changes may be made in construction and arrangement of parts within the meaning and scope of the following claims which are intended and designed to cover any form of mechanism operable by an abnormal movement of the whip roll caused by excessive variations in tension upon the warp to effect the stoppage of the loom.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is:

1. A loom comprising a whip roll, a warp stop motion operable upon detection of a warp fault to effect a stoppage of the loom and a reldasably supported member operable when released by an abnormal movement of the whip roll, caused by a change in the tension of the warp, to initiate the action of said stop motion.

2. A loom comprising a yieldable whip roll, a warp stop motion having a series of detectors, a reciprocating feeler located in proximity to said detectors and adapted, when engaged by a detector, to initiate the action of said stop motion, a releasable member normally supported out of the path of said feeler and means operable by an abnormal yielding movement of the whip roll, caused by an excessive tension upon the warp to release said member thus causing the same to arrest said feeler and thereby initiate the action of said stop motion.

3. A loom comprising a yieldable whip roll, a warp stop motion comprising a series of detectors, a reciprocating feeler located in proximity to said detectors and adapted, when engaged by a detector, to initiate the action of said stop motion, a latch, means normally supporting said latch adjacent to and out of the path of the feeler and means operable by an abnormal yielding movement of said whip roll, caused by an excessive tension upon the warp, to cause said latch to engage and arrest said feeler and thereby initiate the action of said stop motion.

4. A loom comprising a yieldable Whiproll and a warp stop motion having a series of detectors, areciprocating feeler located in proximity to said detectors and adapted, when engaged by a detector, to initiate the action of said stop motion, a latch, frictional means normally supporting said latch adjacent to but out of the path of said feeler and means operable by an abnormal yielding movement of said whip roll, caused by an excessive tension upon the warp, to release said frictional means and thereby permit said latch to drop into the path of said feeler and thereby initiate the action of said stop motion.

5. A loom comprising a warp stop motion having a series of detectors and a reciprocating feeler located below said detectors adapted to initiate the action of said stop motion when engaged and arrested by a' detector, a pivotally mounted latch located above and in proximity to said feeler, frictional means supporting said latch, a yieldable whip roll and means operable by an ab: normal yielding movement of said whip roll, resulting from an excessive tension upon the warp, to release said frictional means thereby permitting said latch to engage andv arrest said feeler, thus initiating the action of the stop motion.

6. A loom comprising a warp stop motion havin series of detectors, a reciproeating feeler located below said detectors and adapted to initiate the action ofsaidstop motion when engaged and arrested by a detector, a slidably, mounted latch-supporting shaft, a latch pivotally mounted upon said shaft and located above and in proximity to said feeler, frictional means acting to retain said latch from rotation upon said shaft and means operable by an abnormal tension upon said warp to move said shaft endwise and thereby release said frictional retaining means, thus permitting said latch to drop into the path of said feeler and by arresting the latter to initiate the action of said stop motion.

7. A loom comprising a warp stop motion having a series of detectors and a reciprocating feeler located below said detectors and adapted to initiate the action of said stop motion when engaged and arrested by a detector, a slidably mounted latch supporting shaft, an actuating arm having a cam operable to move said latch supporting shaft endwise, a latch pivotally mounted on said shaft and located above and in proximity to said feeler, frictional means acting to retain said latch from rotation onsaid shaft, a yieldably mounted whip roll and means operable by an abnormal tension upon said Warp to actuate said cam actuating arm and thereby to move said shaft end *ise and release said frictional retaining means, thus permitting the latch to drop into the path of the feeler and by arresting the latter to initiate the action of the stop motion.

8. A loom comprising a: Warp stop motion having a series of detectors and a reciprocating feeler located below said detectors and adapted to initiate the action of said stop motion when engaged and arrested by a detector, a slidably mounted latch supporting shaft, an actuating arm having a cam operable to move said latch supporting shaft endwise, a latch pivotally mounted on said shaft and located above and in proximity to said feeler, frictional means acting to retain said latch from rotation on said shaft, a yieldably mounted whip roll and means operable by an abnormal tension upon said warp to actuate said cam actuating arm and thereby to move said shaft endwise and release said frictional retaining means, thus permitting the latch to drop into the path of the feeler and by arresting the latter to initiate the action of the stop motion and adjustable means for regulating the extent of movement of said Whip roll required to actuate said cam arm.

9. A loom comprising a warp stop motion having a series of detectors and a reciprocating feeler located below said detectors and adapted to initiate the action of said stop motion when engaged and arrested by a detector, a slidably mounted latch supporting shaft, an actuating arm having a camoperable to move said latch supporting shaft endwise, a latch pivotally mounted on said shaft and located above and in proximity to said feeler, frictional means acting to retain said latch from rotation on said shaft, a whip roll, a rock shaft having an arm supporting said whip roll, means acting upon said rock shaft to yieldably support said whip roll, a rock shaft arm and means operable by the movement of said rock shaft arm when the whip roll is subjected to excessive tension upon the Warp to actuate said cam actuating arm and thereby to release said latch thus permitting the latch to drop into the path of said feeler and by arresting the latter to initiate the action of said stop motion. 7

10. A loom comprising a warp stop motion having a series ofdetectors and a reciprocating feeler located below said detectors and adapted to initiate the action of said stop motion when engaged and arrested by a detector, a slidably mounted latch supporting shaft, an actuating arm having a cam operable to move said latch supporting shaft endwise, a latch pivotally mounted on said shaft and located above and in proximity to said feeler, frictional means acting to retain said latch from rotation on said shaft, a whip roll, a rock shaft having an arm supporting said Whip roll, means acting upon said rock shaft to yieldably support said whip roll, a rock shaft arm, an abutment adjustably secured to said latch actuating arm, a slidably mounted rod connected to said cam arm adapted to be engaged by said abutment upon the movement of said whip roll caused by excessive tension upon the warp and operable thereby to cause said cam to move the latch shaft endwise thereby releasing said latch and permitting it to drop into the path of said feeler and by arresting the latter to initiate the action of said stop motion.

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

HENRY W. YOUNGQUIST'.

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