US1725668A

US1725668A - Harness stop motion for looms

Info

Publication number: US1725668A
Application number: US315393A
Authority: US
Inventors: William H Nix
Original assignee: Draper Corp
Current assignee: Draper Corp
Priority date: 1928-10-27
Filing date: 1928-10-27
Publication date: 1929-08-20
Anticipated expiration: 1946-08-20

Description

w H. NIX- Aug. 20, 1929,

HARNESS STOP MOTION FOR LOOMS Filed Oct. 27, 1928 2 Sheets-Sheet ATTORNEY W. H. NIX

Aug. 20, 1929.

HARNESS STOP MOTION FOR LOOMS Filed Oct, 2?, 192

2 Sheets-Sheet Fateated fang. 192$ UNITED STATES lJZSfiZTS PATENT OFFICE.

WILLIAM H. NIX, OF G-REENSBGRU, NORTH. CAROLINA, ASSIGNOR TO DRAPER COR- PORATION, F HOPEDALE, MASSACHUSETTS, A CORPORATION OF MAINE.

HARNE$S STOP MOTION FOR LOOMS.

Application filed Qctober 27, 1928.

This invention relates to looms and is more particularly directed to a harness stop motion by which the loom is stopped when a harness connection becomes broken or too slack for weaving purposes.

During weaving, the harness frames are raised and lowered in the formation of the shed by means of harness connections with the shedding mechanism. Should one of the harness connections become broken the as sociated harness will of course fail to perform its prescribed function and imperfect cloth is liable to result. Many attempts have been made to overcome this difiiculty and effects loom stoppage when an abnormal condition occurs, but in such cases the mechanism has either been complicated or so related to the other operating parts of the loom as to render such mechanisms open to criticism and objections.

One of the objects of the present invention is to provide a harness stop motion of simple construction and so disposed with relation to the parts of the loom as not to interfere with the operation thereof, and as a further feature of the invention, provision is made for effecting loom stoppage either upon the breakage of a suspending connection or a lower connection with the harnesses.

The invention and new combination of parts will best be made clear from the following description and the accompanying drawings of one good form of means for carrying the invention into effect.

In the drawings:

Fig. 1 is a perspective view showing the present invention associated with harness frames and detached from the loom;

Fig. 2 is a side elevation, parts in section, showing a loom provided with the present invention;

Fig. 3 is a detail, sectional elevation, showing the action of the parts when an upper harness connection breaks; and

Fig. 4 is an. enlarged detail showing one form of means for guiding the stop bar.

The general construction of the loom, its operating mechanism for weaving cloth and the various accessories utilized in this con nection are or may be of old or usual type and need not, therefore, be herein shown and described in detail.

The loom frame 1 may be of usual constructi on and mounted at the rear of the loom is the warp beam 2 from which the warp a Serial No. 315,393.

is directed frontwardly to the weaving mechanism. The lay 3 is carried by the usual lay swords 4 which have a rocking movement about a center 5 at the lower part of the loom frame and, as usual, the lay may be operated from a pitman 6 connected to the crank shaft The Warp threads a pass through eyes or openings 7 in a series of heddles 8 carried by harness frames 9 which are raised and lowered during the weaving operation to form the shed. There may be any number of harness frames 9 but in the present instance of the invention only two are shown, for simplicity of description and illustration.

Connected to the upper portion of each harness frame 9 are the suspending connections 10 which pass about guide pulleys 11 mounted on the loom arch 12, and such suspending connections are attached to any usual form of mechanism for raising the harness frames in any desired sequence for the formation of the shed.

In the present instance of the invention, the lower connections to the harness frames consist of straps 13 and springs 14- whereby the harness frames may be lowered under the dictates of the shedding mechanism.

As hereinbefore stated, it is desirable that the means for initiating loom stoppage on the breakage of either a suspending or lower harness connection be so disposed that it will not interefere with the operations of other parts of the loom, and in the present instance of the invention a frame is provided beneath the harness frames for supporting the mechanesm for initiating loom stoppage. The frame referred to may be of any appropriate. construction but as shown in the present instance of the invention comprises the uprights 15 at each side of the loom below the harness frames, and such uprights are in the present instance connected by the cross-ties 16 and brace bars 17 between the uprights.

Mounted between the cross-ties 16 is a rod or support 18 on which are pivotally mounted a. series of dogs 19 each of which has a hook 20 to which the lower end portion of the springs 14, constituting a part of the loo lower harness connection, are secured, the

result being that the dogs 19 are normally held in elevated position against a bar 21 extending between the cross-ties, the construction being such that should one of the lower connections of the harness frames break, the connected dog 19 will drop or swing about its pivotal support 18, and advantage is taken of this condition to call into action the loom stopping mechanism, as will be presently described.

Mounted on the frame and preferably in the cross-ties 16 is a rocker 22 provided with an offset portion 23 extending between its end pivotal supports, more clearly indicated in Fig. 1. The rocker 22 is positioned with respect to the dogs 19 such that the latter will overlie the offset portion 23 of the rocker which is itself held in its normal raised position against theunder portion of the dogs by an appropriate spring 24, one end of which may be conveniently secured to one of. the cross-ties 16, as at 25. and the other end of which may be attached to the offset portion of the rocker.

From the construction thus far described it will be apparent that should one of the lower harness connections break, its connected dog will drop and engage the offset portion 23 of the rocker, thereby turning the rocker downwardly against the stress of the spring 24.

Since it is usual in effecting lowering movement of the harness frames under spring action, as in the present invention, there is a spring-stressed lower connection to the harness frames at each end thereof or at each side of the loom, the efl'ect being that any lowering movement of the harness frames will be spring-stressed in a downward direction equally throughout their length. Since such lower connections may break either at one side or the other side of the loom, there are two series of dogs and a rocker at each side of the loom, as indicated in Fig. 1.

Each of the rockers 22 is provided with an arm 26 constituting a crank, and connected to the crank arms 26 is a transmitter 27 which, should either of the rockers 22 beturned by a released dog, will be moved in the direction of the arrow, Fig. 1, or to the right as shown. Pivotally connected to the transmitter 27 at 28 is a bell crank lever 29 pivoted at 30 to a suitable bracket 31 secured to the loom frame, and extending upwardly from the upper arm of the bell crank lever is a link 32 the upper end of which is pivotally connected at 33 to a lifter 34. The lifter 34 is pivotally mounted at 35 on the link 39 and has an extended portion 36 underlying the stop member 37. 7

Under normal weaving operations when the suspending and lower harness connections are intact, the lifter 34 will be maintained in the position indicated in Fig. 1, that is, its end 36 will be lowered so that the pivoted stop member 37 which rests on the end 36 of the lifter, will remain in lowered position out of the path of movement of a hunter 38 mounted on the under portion of the lay, as indicated in Fig. 2. Should, however, one of the lower connections break and its associated dog 19 fall, it will engagethe offset portion 23 of the rocker 22 thereby turning the rocker and the crank arms 26 in the direction of the arrows, or to the right. The transmitter 27 will be correspondingly moved, thereby actuating the lifter 34 to raise the stop memher 37 into the path of the hunter 38.

The lifter 34 and stop member 37 are carried by a link 39 pivotally mounted at 40 so that on engagement of the stop member 37 with the hunter 38 as the lay moves back, the stop member and lifter will be moved rearwardly. Connected to the lifter and stop member is a link 41 connected to a knock-off lever 42, the upper end portion 43 of which bears against a shipper 44 which,

as the knock-elf lever is actuated, will detach the shipper from its usual holding notch and effect loom stoppage.

Associated with the loom stopping mechanism is another device to effected loom stoppage should one of the suspending conneclions break, and in the present instance of the invention such device comprises a stop bar 45, one at each side of the loom below the harness frames. Each of the stop bars 45 is mounted for movement in slots 46 formed in the uprights 15 or in an adjustable connection 47 secured thereto.

Underlying each stop bar 45 is a stop slide 48 mounted for sliding movement in lugs 49v adjustab'ly secured to one of the uprights 15, as indicated more clearly in Fig. 1. Each of the stop slides 48' is under the influence of a spring 50 normally acting to hold the stop slide in its upper position against the under side of its associated stop bar 45. The spring'50 may have one end secured to the guide bracket 49, as at 51, and its lower end secured to the slide bar, as indicated at ,52, the stress of the spring tending normal ly to hold the stop bar in raised position but with permissive downward movement under the weight of a dropped harness frame.

Pivotally connected to the stop slide 48 at the left, Fig. 1, is an arm 53, the lower end portion of which is connected at 54 to the transmitter 27, with the result that should the stop bar 45 be depressed under the weight of a dropped harness frame, at the left, Fig. 1, the stop slide 48 will be depressed and act through the arm 53 to move the transmitter 27 in the direction of the arrow, Fig. 1, thereby acting through the lifter 34 to position the stop member 37 for engagement by th hunter 38 on the lay. Y i

The stop slide 48 at the right has also pivotally connected thereto at 55 an arm 56 the lower end portion of which is provided with a slot 57 through which passes the offset portion23 of the rocker 22, with the result that should one of the suspending connections. 10 break at this side of the loom, the harness frame will drop upon the stop bar, effect sliding movement of the stop slide, and through the offset portion 23 of the rocker, turn the rocker to effect movement of the transmitter 27 to the right and effect loom stoppage as hereinbefore explained.

From the construct-ion thus far described it will be apparent that two devices are provided to stop the loom, one of which acts in this capacity to effect loom stoppage upon the breakage of a lower harness connection, and the other of which acts to effect loom stoppage through breakage or undue slackness of a suspending harness connection, and

both said mechanisms act through the rocker 22 to effect their prescribed purpose.

As will be apparent from Fig. 1 of the drawings, the stop slide 48, one at each side of the loom, acts near one end portion of its associated stop bar, and in order to insure proper movement of the stop bar, the present invention provides an arm or projection 58 at each end portion of the stop bar and the outer end portion of each of the arms 58 is mounted in an enlarged slot 59 formed in a brace member 60 the lower portion of which is secured to the associated riser 15 by a bolt (31, best indicated in Fig. 4, the effect being that the stop bar movements are controlled and rendered stable and uniform both in their lowering and rising movements. While this construction has subserved the purpose of properly guiding the stop bar in its movements, it will be apparent, of course, that various expedients may be adapted for this purpose.

From the foregoing description of one good practical form of the present invention it will be apparent that two devices are provided, one of which acts through the rocker 22 to effect loom stoppage on the breakageof a lower connection, and the other of which acts through one of the rockers to effect loom stoppage on the breakage or undue slackness of an upper connection to the harness frames.

What is claimed is:

1. In a harness stop motion for looms, the combination of harness frames, shed forming mechanism including suspending connections for raising the harness frames, lower connections acting yieldingly to lower the harness frames in the shed formation, loom stopping mechanism, a rocker mounted at the lower part of the loom and having an offset portion, means connecting the rocker to the loom stopping mechanism, and two devices mounted below the harness frames, one for operating the rocker to effect loom stoppage when a suspending connection breaks or becomes too slack and the other for operating the rocker to effect loom stoppage when a lower connection breaks.

2. In a harness stop motion for looms, the combination of harness frames, shed forming mechanism includingsuspending connections for raising the harness frames, lower connections acting yieldingly to lower the harness frames in the shed formation, loom stopping mechanism, two rockers mounted at the lower part of the loom, one at each side thereof and each having an off-set portion, means connecting the rockers to the loom stopping mechanism, and two devices mount-ed below the harness frames, one for operating a rocker to effect loom stoppage when a suspending connection breaks or becomes too slack and the other for operating a rocker to effect loom stoppage when a lower connection breaks.

3. In a harness stop motion, the combination of harness frames, shedding mechanism including suspending and lower connections, loom stopping mechanism, a rocker mounted below the harness frames and having an offset portion, and two devices mounted below the harness frames, one for operating upon the oi'lset portion of the rocker to effect loom stoppage when a lower connection breaks, and the other for operating upon the rocker to effect loom stoppage when a suspending connection breaks.

4. In a harness stop motion, the combination of harness frames, shedding mechanism including suspending and lower spring actuated connections, loom stopping mechanism, a rocker mounted below the harness frames and having an off-set portion, a connection between the rocker and loom stopping mechanism, and two devices below the harness frames, one for comprising a series of dogs sustained above the offset portion of the rocker to operate the rocker and effect loom stoppage when a lower connection breaks and the other connected to the rocker to operate it and effect loom stoppage when a suspending connection breaks.

5. In a harness stop motion for looms, the combination of harness frames, shed forming mechanism including suspending connections for raising the harness frames, lower connections including a spring, for lowering the harness frames, loom stopping mechanism, a rocker mounted at the lower part of the loom and having an off-set portion, dogs normally sustained in fixed position above the off-set portion of the rocker by the springs of the lower connections and adapted to actuate the rocker when a lower connection breaks and a dog falls upon the off-set portion of the rocker, and means actuated by rocking movement of the rocker to effect loom stoppage.

6. In a harness stop motion, the combination of harness frames, shedding mechanism including suspending connections and lower spring actuated connections, a rocker having an off-set portion, a series of pivoted dogs normally sustained above the offset portion of the rocker by the lower spring connections, loom stopping mechanism connected to the rocker for operation thereby when a lower connection breaks, a stop bar adapted to be depressed by a harness frame when a suspendin g connection breaks, and means between the rocker and stop bar to turn the rocker and effeet loom stoppage when a suspending connection breaks.

7. In a harness stop motion, the combination of harness frames, shedding mechanism including suspending connections and springstressed lower connections, loom stopping mechanism, a rocker ntiounted below the harncss frames and having an off-set portion, and two devices below the harness frames, one in clnding a series of dogs normally held above the off-set portion, of the rocker by the spring: stressed lower connection to stop the loom when a lower connection breaks, and the other including a stop slide and connections with the rocker to stop the loom when a sus pending connection breaks.

8. In a. harness stop motion, the combination of harness frames, suspending connec tions for the harness frames, a rocker having an off-set portion below the harness frames, a series of pivoted dogs, lower spring-stressed harness connections secured to the pivoted dogs and normally ho ding them above the off-set portion of the rocker, a stop bar e: tending under the harness frames and connected to the rocker, and loom stopping mechanism adapted to be positioned to stop the loom when a lower connection breaks and the rocker is turned and also when the rocker is turned by the stop bar upon breakage of a suspending connection.

9. In a harness stop motion, the combination of harness frames, suspending connections for the harness frames, a rocker having an off-set portion below the harness frames, a series of pivoted dogs, lower spring-stressed harness connections secured to the pivoted dogs and normally holding them above the off-set portion of the rocker, a stop bar ex tending under the harness frames and connected to the rocker, spring means normally acting to hold the stop bar in raised position below the harness frames, and loom stopping mechanism adapted to be positioned to stop the loom when a lower connection breaks and the rocker is turned and also when the rocker is turned by the stop bar npon breakage of a suspending connection.

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

WILLIAM H. NIX.