US1786675A

US1786675A - A omporation

Info

Publication number: US1786675A
Authority: US
Publication date: 1930-12-30
Anticipated expiration: 1947-12-30

Description

Dec. 30, 1930. Q Q J. REGAN 1,786,675

WARP STOP MOTION FOR TERRY TOWEL LOOMS Filed Sept. 17, 1928 2 Sheets-Sheet 1 (10% Ego/7 .u lllllflllllliiil H ...ml

2 Sheets-Sheet 2 I I I L f/m /zzor I [lime/7 all Dec. 30, 1930. J. REGAN I WARP STOP MOTION FOR TERRY TOWEL LOOMS Filed Sept. 17, 1928 291 26 M Ywt i '11 Patented Dec. 30, 1%39 JOHN REGAN, OF NEW BEDFORD, MASSAGHU$ETTS, ASSIGNOR TO OBOMPTON &

KNOWLES LOOM WORKS, MASSACHUSETTS OF WORCESTER, MASSACHUSETTS, A CORPORATION OF WARP STOP MOTION FOR TERRY-TOWEL LOOIVIS Application filed September 17, 1928.

This invention relates to improvements in warp stop motions for looms and it is the general object of the invention to provide a motion effective to stop the loom when all the harnesses of a multiharness loom are leveled.

In a loom employing a plurality of harnesses for producing pattern or varied effects it is usual to find certain of the harnesses which will be either up or down for a plurality of picks, while other harnesses will be crossed to hold the filling. If the loom stops as a result of warp breakage with certain of the harness frames up, forinstance, and the warp fault is in one of the threads which is in the lower plane of the shed the weaver is occasioned some annoyance in tying in the broken thread. The matching-up operation is also likely to cause breakage of one or more of the threads in the upper shed. It is desirable when correcting a warp breakage to have all of the warp threads in a plane, the threads when in this position being under less strain than is the case when the shed is open.

There are certain weaves wherein all the harness threads change their position on at least one pick of the repeat and it is on this pick that all of the warp threads will be in a plane as a result of the normal operation of the loom. It is an important object of my present inventionto provide a warp stop motion efiective to stop the loom at such times only as all of the warp threads will be crossing to gain the advantages already enumerated.

' I have chosen to illustrate my invention in connection with a terry towel loom more especially of the so-called three-pick type. In weaving three-pick terry certain of the harness frames will be held up for two picks and other frames will be correspondingly held down for the same two picks, these frames carrying the pile forming warps. On

' the first pick following the pile forming beat the terry warp controlling harness frames will remain unchanged, so that the last pick of one group of three picks and the first pick of the next group will be in the same shed. On the pick prior to the pile forming beat- Serial No. 306,324.

up, however, the pile forming warp threads are crossed so as to provide the proper friction with the filling to cause said pile warps to be looped when the three picks of filling are moved together as a unit toward the fell of the cloth.

There is ordinarily located on a terry towel loom a part which rotates in time with the terry forming mechanism, that is, on a threepick terry loom there will be a shaft which 6 has one revolution every third pick. It is a further object of my present invention to drive the knock-off for the warp stop motion from a part which is in time with the harness motion or as set forth specifically herein in time with the three-pick motion of the terry forming mechanism.

While I have illustrated my invention in connection with a three'pick terry yet i do not wish to be limited to this particular type of fabric or loom, inasmuchas my invention is equally applicable to any loom having a cycle of harness movements where all the harnesses cross on at least one pick of the repeat of the pattern, loom stoppage being effected by the warp stop-motion at the crossing of all the harnesses, so that the warp threads will all lie substantially in the same plane.

l/Vith these and other objects in view which will appear as the description proceeds, my

invention resides in the combination and an rangenient of parts hereinafter described and set forth in the claims.

In the accompanying drawings, wherein the invention has been illustrated in a three pick terry loom,

Fig. 1 is a rear elevation of a terry towel loom having my invention appliedthereto,

Fig. 2 is a detailed horizontal section taken on line 2 2 of Fig. 1,

Fig 3 is a vertical section taken in the direction of the arrows on line 33 of Fig. 1,

Fig. 1 is a vertical section on line 4 lof Fig. 1,

Fig. 5 is a diagrammatic view showing the relation of the terry forming warps and the filling in a three-pick terry, and

Fig. 6 is a detailed view of the head of the warp stop motion shown in section in Fig. 3, looking in the direction of arrow 6, Fig. 1.

Referring to the drawings, 1 have shown a loom frame 10 and a bottom shaft 11 supported and journaled thereon. A. large gear 12 secured to the bottom shaft meshes with a gear of half the size indicated at 13 and se cured to the top or crank shaft 14;. The latter is operatively connected to the lay 15 by means of a connector 16 which gives the lay a fixed range of movement as the crank shaft rotates.

A reed 17 is pivotally connected as at 18 to an upstanding arm 19 carried at'each end of the lay. The lower part of the reed is operatively connected to a link 20 which is pivotally connected as at 21 to a second link 22. The latter is pivotally connected as at 23 to a rear extension 2 carried by the lay.

An adjustable rod 25 is operatively connected as at 26 to the link 22 and is connected at the lower end thereof to a rocking lever 27. The latter is secured to a rock shaft 28 journaled in the loom frame and in order to give oscillating movement to said shaft- I secure thereto a lever 29 the rear end of which has a roll 30 to enter groove or track 31 of a cam 32. The latter is keyed to a stub shaft 33 mounted in an auxiliary frame 34 fixed with respect to the main loom frame.

Secured to the bottom shaft 11 is a gear 35 which meshes with another gear 36 secured to the stub shaft 33. In the present instance the ratio between the

gears

35 and 36 is as 2 is to 3 and the ratio between the

gears

12, and 13 is as 2 is to 1. It will therefore be seen that the stub shaft 33 and the cam 32 receive a complete revolution every third pick of the loom. The groove 31 of the cam 32 as indicated in Fig. 3 is such as to cause an oscillation of rockshaft 28 every third pick of the loom at which time the shaft 28 will move upwardly to the position shown in Fig. 3 with the

links

20 and 22 in substantial alignment. The effect of this is to move the reed 17 to its foremost or pile forming position. On other picks of the loom the lever 27 will be relatively down so that the reed 17 will be moved to a rear position. It is in this way that terry is formed in the well-known manner.

. As shown in Fig. 5 the terry forming pile which is .derived from beam T will be controlled by the harness mechanism D so as to remain in a given position for two picks of filling. For instance, during the laying of thelast pick F of one group of picks and the first pick F of the next group the terry warp will be raised as at 37. When the third pick F is to be laid, however, the harnesses Will cross preparatory to the beating-up of the length of pile 37 extending between picks F and F. It will be seen from Fig. 5 that the terry harnesses remain open for two picks and cross for the third pick. There are of course the usual ground warps which cross every pick and it will therefore be seen that on every third pick all ofthe harnesses will cross, but thaton the intrevening picks certain of the warp threads will be held up so as to render the mending of the broken warp inconvenient.

The matter thus far described is of com mon construction and of itself forms no part of mypresent invention. The loom may be constructed as shown in patent to Bardsley No. 937,139, or if the entire range of movement of the lay and its connector changes periodically so as to effect pile forming with a reed which is fixed to the lay the construction may be substantially the same as shown in patent to Rothwell No. 257,517. It will also be understood that in theusual form of terry towel certain of the pile warps Will be disposed oppositely to that shown in Fig. 5 so that piles will appear on both sides of the finished cloth.

As previously stated my present invention relates to means for knocking ofi the loom when all the harnesses are crossing. Accordingly, I secure to the rock shaft 28 an arm 50 to the end of which is conhected the lower end of a driving rod 51. I This rod corresponds to a similar rod 17 shown in patent to Holmes No. 1,360,638. Said rod 51 is-connected to an oscillating lever 52 which is pivoted in the head 53 of a Warp stop motion which may be constructed as shown in said Holmes patent and operating on the principle set forth in my Reissue Patent No. 14,829. Said lever 52 is provided with hook 5.4 which is adapted to cooperate with a dog 55 pivoted as at 56 to a knock-off lever 57 having pivotal connection with the head 53.

By means of a yielding driving connection 58 rocking'movement of lever 52 is communicated to a plurality of arms 59operatively connected to non-circular detector rods 60.

The latter extend through the upper ends of drop wires or detecting elements 61 having therein slots the upper ends of which are restricted as at 62. The drop wires are supported by the warp threads and are normally held with the restricted parts of the slots above the detectors 60, so that when all the warp threads are intact said detectors are free to move without interruption. When a drop wire falls, however, the corresponding detector rod 60 will be held against oscillation and the dog 55 will lie in the path of the hook 54 so that as the latter oscillates the irnock-olf rod 63 will operate to stop the For a further description of the constructron and operation of the particular Warp stop motion set forth herein reference maybe had to my aforesaid reissue patent and also to the patent to Holmes.

In the operation of the mechanism the harnesses II will be controlled as to their movements by the harness controlling mechanism D shown herein as a dobby of the usual form. It is not deemed necessary to set forth particularly the construction of the dobby nor its manner of operation as the same is well understood. The dobby will act through the mechanism shown in Fig. 1 to raise the harnesses so that the ground warps will be crossed every pick and the pile forming warps will be crossed as set forth in Fig. 5. So far as the broader aspects of my inven tion are concerned it is not necessary that the ground warps cross at every pick but it is desirable that at some point in the repeat or cycle of the weave all the harnesses shall cross and this feature of my invention is not necessarily limited to a terry towel loom.

The cam 32 will act through lever 29 to give an upward or loom stopping movement to the rod 51 every third pick of the loom when all the harnesses are crossing so that should the dog 55 be in the path of the hook 5a the loom will be stopped through the rod 63. It is obvious that by the arrangement set forth herein the loom will stop only on those picks when all the harnesses are changing their position so that irrespective of the location of the warp fault whether the broken thread be in the ground warp or in the terry forming warp all of said threads will lie in a plane to facilitate the mending operation when the loom is stopped.

While I have shown a warp stop motion of the type set forth in my aforesaid reissue patent yet I do not wish to be limited to this particular mechanism as my invention is applicable to any type of warp stop motion wherein the stopping is efiected through a periodic impulse such as that derived from the cam 32.

From the foregoing it will be seen that I have provided a simple means for effecting stoppage of the loom through the warp stop motion on those picks only when all the harnesses are crossing. Such mechanism results in having all the warp threads in substantially a single plane when the loom stops so that the weaver may correct the warp fault with ease and without danger of breaking any warp threads which might otherwise be in a raised position. I wish it to be understood that although I have shown the invention in connection with terry fabric yet there are other types of cloth the weave of which requires all of the harnesses to change their positions at one pick or another in the repeat of the pattern, and my invention is equally applicable in such cases, the rod 51 being given the knocking-off motion on the pick when all the harnesses shift their position.

Having thus described my invention it will be seen that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope nesses, a warp stop motion, and an actuator for the stop motion operatively connected to the member and having a knocking-off stroke on that pick of the repeat when all the harnesses cross and effective to stop the loom when a fault occurs in the warp.

2. In a warp stop motion for a terry towel loom having a plurality of harnesses which complete the repeat of the pattern in three picks and all of which cross on one pick of the repeat, a terry forming member having one movement for each repeat of the harnesses, an actuator operatively connected to the member and having a working stroke on that pick of the repeat when all the harnesses cross, and means to be operatively connected to the actuator upon occurrence of a fault in the warp to stop the loom on that pick when all the harnesses are crossing.

3. In a warp stop motion for a terry towel loom having a plurality of harnesses which complete the repeat of the pattern in a plurality of picks in excess of two and all of which cross on one pick of the repeat, a terry forming member having one movement for each repeat of the harnesses, an actuator operatively connected to the member and having a working stroke on that pick of the repeat when all the harnesses cross, and means to be operatively connected to the actuator upon occurrence of a fault in the warpto stop the loom on that pick when all the harnesses are crossing.

4. In a terry towel loom, means to form terry at periodic intervals separated by a given number of picks, a warp stop motion, an actuator therefor effective to knock-off the loom through the warp stop motion when a fault occurs in the warp, and connections between the actuator and means to give the actuator a working stroke on terry forming beats of the loom.

5. In a warp stop motion for a terry towel loom having a plurality of harnesses which complete the repeat of the pattern in three picks and all of which cross on one pick of the repeat, a filling beating up member, means to give said member a terry forming movement once for each cycle of the repeat of the pattern, and mechanism acting in timed relation with and operatively connected to the means and efiective to stop the loom on that pick when all the harnesses cross upon occurrence of a fault in the warp.

6. In a loom having a plurality of harnesses which operate in a repeat requiring 4 massi e three or more picks of the loom for completion, the harnesses all crossing at one pick in a complete repeat, and means active on the pick when all the harnesses cross and at 5 rest on all other picks of the repeat at intervals equal to the length of the repeat to stop the loom upon fault of a Warp thread on that pick when all the harnesses are crossing.

' 7. In a warp stop motion for a loom having a harness motion to weave a pattern having a repeat of more than two picks and wherein all the harnesses are leveled on a pick of the repeat, an element forming part of the Warp stop motion active on that pick of the repeat when all the harnesses are leveled and at rest on all other picks of the repeat, and means to be operatively related to the element when the latter is active to stop the loom when a fault occurs in the Warp. .In testimony whereof I have hereunto affixed my signature.

JOHN REGAN.