US1462548A - A cospoeation op - Google Patents

Description

July 24, 1923. 1,462,548

E. R. HOLMES WARP STOP MOTION Filed Jim. 11, 1921 2 Sheets-Sheet l wwxlwm Jul 24, 1923. 1,452,543

Ev R. HOLMES WARP S TOP MOTI ON Filed Jan. 11 1921 2 Sheets-Sheet 2 Patented July 24, 1923.

hd dhwd IELBRIDGE R. HOLMES, OF WORCESTER. IKASSACHUSETTS, ASSIGNOR TO CROMPTON & KNOWLES LOOM WORKS, OF WOHCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

WARP STOP FICTION.

Application filed January 11, 1921.

T all whom it may concern:

Be it known that I, ELBRIDGE R. HOLMES, a citizen of the United States, residing at Worcester, in the county of Worcester and State of Massachusetts, have invented a new and useful Warp Stop Motion, of which the .following is a specification. 4

This invention relates to a warp stop motion and particularly to certain improvements in a warp stop motion of the type shown in my prior Patent #1,360,638 dated November 30, 1920. Under certain conditions the device shown in my prior patent is found not entirely satisfactory, as the loom is sometimes stopped a second time and unnecessarily when started after a warp break has been repaired.

It is the obi ect of my invention to provide certain improvements in warp stop mechanism of this general type whereby this unnecessary stopping of the loom may be avoided.

lVith this object in view, my invention particularly relates to improved connections between the knock-off rod and the stop motion pawl, whereby the rod more effectively controls the position of the pawl after the loom is stopped.

My invention further relates to arrangements and combinations of parts which will be hereinafter described and more particularly pointed out in the appended claims.

A preferred form of my invention is shown in the drawings in which.

Fig. 1 is a side elevation of a loom with my improved stop motion mounted thereon:

Fig. 2 is an enlarged side elevation of parts of the stop motion shown in-Fig. 1, the loom being stopped;

Fig. 3 is a similar sideelevation showing the parts in normal running position;

Fig. 4 is a rear elevationof the parts shown in Fig. 3;

Figs. 5 and 6 are side elevations similar to Figs. 3 and 4 andshowing the parts at dif' ferent stages of the loom stopping operation;-and s Fig. 7 is a view of a drop wire adapted for use in my improved stop motion.

Referring to the drawings, I have shown a loom frame 10 supporting a shipper handle 11 which is connected by a knock-off rod 12 to the warp stop motion to be described. The handle 11 has a pin and slot connection .cam shaft of the loom.

Serial No. 436,427.

to a lever 13 pivoted at 14 to the loom frame and having a spring plunger 15 connected thereto. The plunger 15 extends through a bracket 16 and is provided with a compression spring 17 which tends to throw the shipper handle 11 to its extreme off position as soon as it is released by the knock-0E rod.

My improved stop motion comprises end frames 20 adjustably secured to L-shaped rods 21 which, in turn, are adjustable in eye bars 22 which may be secured in selected vertical position in blocks 23 on the loom side 10. A plurality of drop wires /V are supported by the warp threads, preferably in parallel banks and an oscillating detector rod 24 extends through each bank of drop wires.

The stop motion shown in the drawings is arranged for four banks of drop wires and arms 25, 26, 27 and 28 are secured to the four detecting rods .24. These arms are 7 connected by links 30and the arm 25 isprovided with an upward extension 31 to which is pivotally connected a. U-shaped rod or link 32.

An actuator 38 is pivoted on a stud 34 on the stop motion frame 20 and is connected by a link 35 (Fig. .1) to a lever 36 which is regularly oscillated by a cam 37 on the lower The upper end of theactuator 33 is forked at 38 and is provided with a loosely pivoted cross stud 39 through which the upper end of the U- shaped link 32 extends. A collar 40 limits downward movement of the link relative to the stud 39 and a coil spring 41 yieldingl resists upward movement of the link. A

collar 42 is provided for adjustment of the spring tension.

The actuator is also provided with 0. depending hook or projection 43 adapted to engage a pawl 44 when the latter is in operative position. The pawl 44 is pivoted at 45 on aswinging arm or stand 46,.also looselv "pivoted on the fixed stud-34. The normal end of the knock-off rod 12. The head 53 has a depending projection 54: supporting a pin or stud 55, also positioned to at times engage the pawl plate l9.

Having described the construction of my improved stop motion, I will now describe its method of operation. When the drop wires W are all supported by their respective warp threads, the detector rods 24 oscillate freely in the broad lower portion of the drop wire slots and. at each such oscillation the pin engages the plate 49 and swings the pawl 44 downward, out of the path of the hook 43.

WVhen. however, the oscillation of the rods 24 is prevented by a fallen drop wire, the rods are held in the position shown in Fig. 5, and continued. movement of the actuator 33 merely compresses the spring ll on the link 32. As the pin 50 is not then moved to the left to engage the plate 49, the pawl 44 I remains in the path of the hook l3 and i I a engaged thereby as clearly shown in Big- 5. Such engagement pushes the knock-oil rod 12 to the left or toward the front of the loom and releases the shipper handle whlch "is thereafter moved by the spring 17 to full off position.

The excess movement of the shipper handle and knock-off rod is permitted by the provision of the slot 52 in the head 53 of the knock-off rod. During such excess movement the pin 55 in the head 53 engages the plate 49 on the pawl 44 and pulls the pawl out of engagement with the hook 43, as

" shown in Fig. 6. The weight of the knockoff rod. acting through the inclined slot 52 against the stud 51 has the effect of a cam to move the arm 46 back to its normal position as shown in Fig. 2, the pawl l i mov ing under the hook 43. The parts are then in such position that the loom may be started without again engaging the pawl by the hook and stopping the loom a second time.

In my prior patent no provision was made for moving the pawl out of the path of the hook as the loom was stopped and consequently the pawl was frequently engaged by the hook on the actuator on its first oscillation after the loom was started, thus causing a second and unnecessary stopping of the loom.

Having thus described my invention it will be evident that changes and modifi- 1 cations can be made therein by those skilled in the art within the spirit and scope of my invention as set forth in the claims, and I do not wish to be otherwise limited to the details herein disclosed but what I claim is 2. A warp stop motion having, in comhination, a pluralityof drop wires, an actuator, a loom stopping mechanism including a knock-off rod, a device operable to connect said actuator to said rod and movable to operative and inoperative positions, said device being normally inoperative and being rendered operative by a fallen drop wire, and means associated with said knock-off rod for restoring said device to inoperative position as the loom is stopped.

3. I11 a warp stop motion, a pawl, a pawl actuator, means to regularly oscillate said actuator, warp controlled means to move said pawl into and out of the path of said actuator, and loom stopping mechanism actuated through said pawl nd also effective to move said pawl out of the path of said actuator as the loom is'stopped.

4:. A warp stop motion having, in combination, a pluralityof drop wires, an actuator, a swinging arm, a pawl pivoted on said arm and movable into and out of the pathof said actuator, said pawl having a depending extension, a plurality of oscillating detector rods for said drop wires, a member movable with said rods, a knock-off rod, and a device associated therewith, said member and said device each engaging said depending projection of said pawl under certain conditions to move said pawl to inoperative position.

5. A warp stop motion having, in combination, a plurality of drop wires arranged in parallel banks, rods for said drop wires, means to yieldingly' oscillate said rods, and loom stopping mechanism controlled by said rods and drop wires, said mechanism including a pawl,means to engage and move said pawl when in operative position, a member movable with said rod and connections effective to move said pawl to inoperative position when said rods are freely movable, a swinging arm on which said pawl is mounted, a knock-off rod, and a lost motion connection between said rod and arm, said connection including a device'also effective to withdraw said. pawl to inoperative position when the loom is'stopped.

In testimony whereof I have hereunto affixed my signature.

ELBRIDGE R. HGLMES.

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