US1924790A

US1924790A - Driving means for warp stop motions

Info

Publication number: US1924790A
Application number: US661365A
Authority: US
Inventors: Hyde Joseph
Original assignee: Draper Corp
Current assignee: Draper Corp
Priority date: 1933-03-17
Filing date: 1933-03-17
Publication date: 1933-08-29
Anticipated expiration: 1950-08-29

Description

Aug. 29, 1933. HYDE 1,924,790

DRIVING MEANS FOR WARP STOP MOTIONS Filed March 17, 1955 EyiI.

W/ T/VESJ. INVENTOR. C2 //vTa/vJ,Co5u/e/v. J05: PH H YDE.

ATTORNEY.

Patented Aug. 29, 1933 UNlTEfi STATES DRIVING MEANS FOR WARP STOP MOTIONS Joseph Hyde, Gainesville, Ga, assignor to Draper Corporation, Hopedaie, Mass, a corporation of Maine Application March 17, 1933.

Serial No. 661,365

8 Claims. (01. 139360) The present invention relates to warp stop motions for looms and more particularly relates to the means for driving the or llator arm thereof.

The conventional types of warp stop motions now in use usually include moving detector members, operated by an oscillator and adapted to be arrested by a fallen drop wire, devices being provided for stopping the loom when movement of the detector members is thus arrested. It has been difficult to devise satisfactory means for driving the oscillator arm, because of the many factors which must be taken into consideration. Notable among these factors are the remoteness from the warp stop motion of a convenient source of power, the limited space available for driving connections, and, in some instances at least, the necessity of providing for adjustment of the warp stop motion forwardly and rearwardly on the loom.

The more common method of driving the oscillator arm involves the use of cam on the loom cam shaft, operating a cam follower rod which is connected to the oscillator arm through the medium of a form of knuckle joint, such as is shown, for example, in the patent to I. W. Noyes, No. 1,729,592, dated Sept. 24, 1929 or the patent to H. A. Davis, No. 1,687,471, dated Oct. 9, 1928. Such driving means have not proven entirely satisfactory for the reason that they present points subject to excessive wear, and depend upon relative sliding movement of certain of the parts, or lost-motion in others, to compensate for the fact that the oscillator arm and the driving means therefor operate in different planes.

Accordingly, it is an object of myinvention to provide, in a warp stop motion, improved driving means for the oscillator arm thereof, which drivin means shall be devoid of parts which might be subject to excessive wear.

A further object of my invention is to provide a new and improved oscillator rod for driving the oscillator arm of a warp stop motion, which oscillator rod shall be so constructed as to replace the oscillator rod and the connecting parts, or knuckle joint, of existin warp stop motions.

Further objects of my nvention will, in part, be hereinafter more specifically enumerated, or will become obvious as the description proceeds.

The preferred embodiment of my invention is illustrated in the accompanying drawing to which reference may be had and of which:

Fig. 1 is a view in perspective of the left hand end of a warp stop motion, and the driving parts, embodying my invention; and

Fig. 2 is a detail view, to a larger scale, of a portion of my improved oscillator red, the end of the oscillator arm being shown in section.

The warp stop motion which I have chosen to illustrate the application of my invention includes drop wires 1 which, upon breakage of the re spective supporting warp thread or threads, engage the teeth of detector members 2 to arrest tl movement. The detector members 2 are supported. and guided in toothed supporting bars 3 and are moved longitudinally, i. e. widthwise of the loom, by fingers i. The fingers a are reciprocated by a usual form of oscillator arm 5, through the medium of certain connections not shown in detail. The particular oscillator arm shown extends in the same general direction as the detector members and operates in a vertical plane parallel thereto.

When a drop wire 1 arrests movement of a detector member 2, the movement of the oscillator arm will be imparted to one of the levers 6 which will in turn, push downwardly upon a pivoted plate 7 to thereby operate a Bowden wire 8 connected to parts, not shown, for stopping the loom.

The warp stop motion is supported by stands, of which only the left hand stand 9 is shown. These stands are provided with slots 16 extending at right angles to slots 11 in brackets 12 supported by the loom side (not shown), the slots, together with securing bolts 13, constituting means for mounting the stands for adjustment forwardly and rearwardly or transversely of the loom.

The warp stop motion as thus far described is identical with that shown in the aforementioned Patent 1,687,471, to which reference may be had for a more detailed disclosure of the construction and operation of such mechanism. -It is noted at this time that the warp stop motion itself apertains to my invention only insofar as it constitutes one element in a combination, and other forms of warp stop motion maybe substituted for the one herein disclosed.

In certain well-known constructions, including those of the. above mentioned Davis and Noyes patents, the necessary power for operating the oscillator arm of the warp stop motion is derived from a cam on the loom cam. shaft and is transmitted to the oscillator arm by a part known in the art as an oscillator rod. The embodiment of my invention herein disclosed includes such a cam 14 mounted on the loom cam shaft 15 and serving to reciprocate, endwise, an oscillator rod indicated generally at 16. The cam 14 is a double track, face cam identical with that shown in the said Davis patent.- A collar-.17 serves to. retain the oscillator rod against the cam and, where my invention is employed, may serve to substantially limit the movement of oscillator rod to endwise reciprocation and oscillation about the axis of the cam shaft, i. e. to movement in a vertical plane which intersects the plane of movement of the oscillator at approximately a right angle. Prior constructions required a sloppy fit of the oscillator rod between the collar 17 and cam 1%, to compensatefor inherent limitations in the flexibility oi the connections between the oscillator rod and the oscillator arm.

In the present embodiment of my invention, I form the oscillator rod of two separate parts or pieces. rod and embodies a cam follower, in the usual manner. The upper piece 19 includes means for attachment to the oscillator arm. To this end, the piece 19 may be formed of a round iron or steel rod bent laterally as at 20 to project through a slot 21 in the oscillator arm. The bent portion 29 is threaded to receive

nuts

22, 22 which are located on opposite sides of the oscillator arm and rigidly clamp the piece 19 thereto. The piece 19 constitutes a form of fixed connector, for connecting a spring 23 with the oscillator arm. Other connectors may be substituted if so desired.

The spring 23 is interposed between the rod 18 and the connector 19 or, in effect, between the rod 18 and the oscillator arm. The spring shown is of the well known coiled variety and has its lower end secured to the upper end of rod 18 as by having its coils engaged in threads formed on the rod. The upper end of the spring 23 is fixed with respect to the oscillator arm and this result may be accomplished by engaging the coils of the spring in threads formed on the lower end of connector 19, as shown.

The spring 23 is sufficiently rigid to impart motion from the rod 18 to the connector 19, and thereby to the oscillator arm, but is yieldable laterally of the direction of such motion. The physical dimensions of the spring necessary to result in the desired mode of operation will, of course, vary with the size and kind of warp stop motion employed, and other factors, but such dimensions are easily determinable regardless of whether the spring employed is of the coiled type or otherwise.

It will be apparent that the use of a spring for the purpose indicated will permit proper cooperation between the rod 18 and the oscillator arm even though the warp stop motion be adjusted forwardly or rearwardly or laterally on the loom.

It will likewise be apparent that my improved oscillator rod can be substituted for existing devices, and will eliminate the knuckle joints or other parts which may be subject to rapid wear.

I wish to direct attention to the fact that my invention, in at least one of its respects, is not restricted to the constructions wherein the reciprocating part which activates the oscillator arm is constituted by a reciprocating rod. as 18, but many other forms of reciprocating partsmay be employed.

Having disclosed the preferred embodiment of my invention, I claim:

1. A warp stop motion including movable detector r'nembers, means including an oscillator arm for moving said members, a connector rigidly fixe d to said oscillator arm, a earn, a rod reciprocated endwise by said cam and confined to movements in a single plane, and a spring having one end secured to said rod and its other end secured to said connector, said spring being suinciently rigid to impart motion from said rod to said connector but being yieldable laterally of the direction of said motion.

2. A warp stop motion including movable detector members, means including an oscillator arm for moving said members, a connector rigidly fixed to said oscillator arm, a cam, a rod re- The lower piece 18 is in the form of a ciprocated endwise by said cam and confined to movements in a single plane, and aspring interposed between said connector and said rod and constituting the sole connection therebetween, said spring being sufficiently rigid to impart motion from said rod to said connector but being yieldable laterally of the direction of said motion.

3. A warp stop motion including a stand, means for adjustably mounting said stand on a loom for forward and rearward adjustment, detector members supported by said stand, means including an oscillator arm for moving said members, an endwise reciprocating rod, which rod is confined to'moveinents in a single plane, and a spring having one end fixed to said rod and its other end fixed with respectto said oscillator arm for operating the latter, said spring being sufficiently rigid to impart motion from said rod to said oscillator arm but being yieldable laterally of the 5. A warp stop motion including movable detec- .c

tor members, means including an oscillator arm operating in a given plane for moving said members, a reciprocating part operating in a diiferent plane, and a spring having one end fixed to said part and its other end fixed with respect to said oscillator arm for operating the latter, said spring being sufiiciently rigid to impart motion from said rod to said oscillator arm but being yieldable laterally of the direction of said motion.

6. A warp stop motion including movable detector members, means including an oscillator arm for moving said members, a reciprocating part, and a coiled spring having one end fixed to said part and its other end fixed with respect to said oscillator arm for operating the latter, said spring being SLlfllClSl'ltlY rigid to impart motion from said rod to said oscillator arm but being yieldable laterally of the direction of said motion.

7. As an article of manufacture, an endwise movable oscillator rod for driving the oscillator arm of warp stop motions, said oscillator rod being formed of separate pieces the lower one of which embodies a cam follower and the upper one of which includes means for attachment to an oscillator arm, the said pieces being connected by a spring which is sufiiciently rigid to impart motion from the lower one of said pieces to the upper one thereof but which is yieldable laterally of the direction of said motion.

8. As an article of manufacture, an endwise movable oscillator rod for driving the oscillator arm of warp stop motions, said. oscillator rod being formed of separate pieces the lower one of which embodies a cam follower and the upper one of which includes means for attachment to an oscillator arm, thesaid pieces being connected by a coiled spring which is sufiiciently rigid to impart motion from the lower one of said pieces to the upper one thereof but which is yieldable laterally of the direction of said motion.

JOSEPH HYDE.