US1391928A - Warp-tension-controlling mechanism for looms - Google Patents

Description

H. w. .YOUNGQUIST. I WARP TENSION CONTROLUNG MECHANISM FOR Looms. APPLICATION FILED SEPT. 8, 1920.

1,391,928. PatentedSept. 27,1921..

2 SHEETS-SHEET l.

\nvnTor. I Henry W.vYoungq uisT H. W. YOUNGQUIST.

WARP TENSION CONTROLLING MECHANISM FOR LOO MS.

APPLICATION FILED SEPT. B. 1920.

1,391,928, PatentedSept. 27,1921.

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L IIIIIIIIIII InvenTor. Henry W.Youngq;uisT M WIIW Aflys.

' UNITED STATES PATENT OFFICE.

HENRY W. YOUNGQUIST, OF MANCHESTER, NEW HAMPSHIRE, ASSIGNOR TO DRAPER CORPORATION;

MAINE.

OF HOPEDALE, MASSACHUSETTS, A CORPORATION OF Specification of Letters Patent. Patented Sept. 27, 1921- Application filed September 8, 1920. Serial Noi 409,000.

T 0 all to 7mm it may concern Be it known that I, HENRY lV. YOUNG- QUIST, a citizen of the United States, and resident of Manchester, county of Hillsborough, State of New Hampshire, have invented an Improvement in Warp-Tension- Controlling Mechanism for Looms, of which the following description, in connection with the accompanying drawing, is a specification, like characters on the drawing representing like parts.

This invention relates to improvements in warp tension controlling mechanism for looms, and the general object of the inven tion is to provide a mechanism which will let off the warp more uniformly than is accomplished in devices heretofore employed.

In the usual types of let off mechanisms the rotation of thewarp beam is controlled by a frictional mechanism or by a pawl and ratchet mechanism which maintains a relatively heavy tension upon the warp at all times and the rotationof the beam is inter mittent and more or less jerky.

By the present invention a relatively light tension is normally applied to the warps, preferably through a braking mechanism operating upon the warp beam, and the tensionmechanism is locked at a predetermined position of the lay in its beat-up movements, p'referablyjust before the reed. engages the fell of the cloth so that the prevent the breakage of warps when the shuttle becomes misplaced, as by rebounding into the shed during theoperation of.

the loom. In the present invention the tension which is imposed upon thewarp may be so light that if a shuttle should rebound into the shed the warp beam would be rotated sufiiciently as the shuttle is forced forward by the lay to prevent the breakage of the-warp before thetension mechanism is finally locked at the end of the beat-up of the lay. j

A further object of the invention is to provide a novel braking mechanism for warp beams of looms which is, operable to maintam-a predetermined tension upon the warp and at a predetermined position of the'lav in itsbeat-up which will be'actuated to lock the warp beam against rotation.

A further object of the invention is to provide braking mechanism for the warp beam of the loom of the character described with means for varyingthe amount of tension normally imposed upon the warps.

A further object of the invention is to provide a brakefor the warp beam of the loom which can be readily released to enable the warp beam to be removed and replaced with out varying the adjustment of the braking mechanism.

Further objects and features of the inventionwill more fully appear-from the following description and accompanying drawing and will be pointed out in the annexed claims A preferred embodiment of the invention isillustrated in the accompanying drawing as applied to the well known Northrop type of loom.

Figure 1 is a transverse sectional view of 'a sufiicient portion of a usual type of loom as is necessary to illustrate the invention embodied therein as applied thereto.

Fig. 2 is a rear elevatlon of a portion of a loom frame showing one end of the warp. beam wlth the braking mechanism embodying my invention applied thereto.

Fig. 3 is. a detail plan view of the lever mechanism for operating the warp beam brake. Fig. 4 is a detail side elevation of a portion of a preferred form of brake constructedin detachable sections. 7

Fig. 5 is. a plan view of the brake illustrated inFig. 4 showing a preferred fornr of interlocking detachable members.

The present invention is illustrated herein as applied toausualtype of loom 'which comprises the usual side frames 1, breast beam 2 and lay 3, which is supported upon swords l which are secured to a rock shaft 5 mounted 1n..su1t'able bearings 1n the loom sides. The loomsides are also connected by the usual cross girder 6. The loom may and does comprise the other usual mechanisms which, being well known and formmg no part of the present invention need not be illustrated herein.

The usual warp beam 7 is mounted upon a shaft 8 which is journaled in suitable open bearings 9 in the loom sides. The warp beam is provided with a brake drum 10 which may be acted upon by any suitable type of braking mechanism which will perform the function of locking the beam against rotation when the lay'reaches a pre determined position in its beat-up.

In the preferred construction illustrated the brake comprises sections 11 and 12 preferably made of flexible metal such as steel, which have attached to their ends respectively L-shaped locking members 13 and 14 so constructed that the laterally extending portion 15 of one will engage the laterally extending portion 16 of the other. The cooperatingengaging faces of the extensions 15 and 16 are inclined in such a manner as to provide, in effect, hooks whichinterlock with each other.

A brake shoe 17 which is secured at one end to one of the said sections underlies the brake strap sections 11 and 12 and engages the surface of the drum.

When the warp beam is to be removed the tension upon the brake is released as will hereinafter be more fully described, and

the interlocking members 13 and 1 1 disen gaged, so that the sections 11 and 12 may be separated and the warp beam lifted from its bearings. Upon the introduction of a new warp beam, the brake sections may be again applied by merely interlocking the detachable members 13 and ll and the normal tension restored without modifying the adjustment of the tension applying means.

Any suitable means may be provided for actuating the brake band to control the rotation of the warp beam to effect the purpose herein described. In the construction illustrated herein one end of the section 11 of the brake band is rigidly secured to an extension 18 of a bracket 19 which is secured to the loom side. The free end of section 12 of the brake is provided with a clamp 20 which is connected by a hook shaped link 21 to a brake actuating lever which is operated by suitably actuating means and moving in consonance with the movement of the lay and which serves to clamp the brake upon the brake. drum with sufiicient force to lock the warp beam against rotation when the lay has reached a predetermined position in its beat-up preferably when the reed is almost in engagement with the fell of theweb of the cloth being. woven.

"The preferred form of brake lever is con- .structed in two sections which are yieldably connected together in order to prevent the shock of the actuating mechanism from fracturing the lever. As illustrated, the brake lever comprises a main section 22 hav ing hook shaped end which engages the link 21 and which is pivoted upon a stud 23 projecting from the bracket 19, and a supplemental section 24: which also is pivoted upon the stud 23 and is provided with a downward extension 25 to which the actuating mechanism is connected.

The brake lever sections 22 and 24c desirably are provided avith laterally extending bosses 26 and 27 having respectively seats for a heavy spring 28 through which motion is imparted from the supplemental section 24 to the main section 22. This spring is of sufiicient strength to transmitthe force applied to the supplemental section to the main section to properly actuate the brake, but is adaptedto yield enough to prevent breakage caused by any unusual movement of the supplemental section. It also serves as a cushion to reduce the likelihood of crystallization of the parts due to repeated shocks.

Any suitable means may be providedfor actuating the supplemental section of the brake lever. As illustrated, the depending end 25 of said supplemental section is connected to one end of link 29. the other end of which is'adjustably secured by a set screw 30 in'a sleeve 31 which is pivotally connected with the upper end of an arm 32, the lower end of which is pivotally mounted upon a stud 33 upon an arm or extension 34: of the rock shaft 5 which carries the swords which support the'lay.

The arm 32 is provided with a lateral extension 35, which lies in the path of one of the swordsof the lay so that the latter engages the same during the beat-up movement of the lay, thereby actuating the arm 32 through the link 29, transmitting its movement to the arm 25 of the supplemen tal section of the brake lever. The movement of the supplemental section in turn actuates the main section 22 of the brake lever and causes the same to apply the brake to the brake drum with sufiicient force to lock the warp beam against rotation.

It may be noted that the arm 32 of the rock shaft 5 oscillates with the sword and that the armr'32 is movable relatively to the sword. By reason of this construction. and the adjustable connection between the arm 32 and the link 25 the action of the brake can'be so adjusted that the brake will be applied just before the reed engages the fell of the cloth.

Thus a normal, uniform lighttension may be maintained upon the warps at all times and, the tension mechanism looked after the shuttle has been thrown across-the lay and just before the lay beats up the filling.

By this lockingthe' tension mechanism for the warp threads just before the beat up takes place, a very light normal tension'may sufliciently to prevent breakage of the warp.

Furthermore, by thus providing means for releasing the normal light tension on the warp, the warp beam can be readily rotated by the operator when it is necessary to change the warp or to pick out imperfectly woven filling.

Any suitable means may be provided for maintaining this light normal tension upon the warp. 'A convenient means which is illustrated herein, comprises a stop which is in the form of an arm 36 pivotally secured to a bracket 37 upon the cross girder 6, the stop 36 being in a position to engage the depending end 25 of the lever 24: at such a point as to maintain a predetermined tension upon the brake. This stop 36- may be adjustably held in proper position by any suitable means As illustrated, the stop 36 is provided with a lateral extension 38 which is engaged byan adjusting screw 39 mounted in a swinging arm or retainer 40, which is pivotally mountedupon a stud 41 projecting from a bracket 42 secured to the cross girder 6, the cross girder 6 being provided with a slot 43 through which the extension 38 projects. A spring .44 surrounding the stem of the screw 39 and abutting at one end upon the retainer 40 and at the other end against the head 45of the screw serves to prevent the screw from rotation and thereby to hold it in position of adjustment to which it is set by the operator. 8

The bracket 42 desirably is provided with an offset hook shaped support 46 for the retainer 40 which will hold it normally in operative position but will permit the retainer to be swung out of the path of the extension 38 of the stop 36, thus enabling the pressure which normally is exerted upon the downward extension 25 of the supplemental section of the brake lever, to be removed when it is desirable to rotatethe warp beam 3, manually, or to release the brake sufiiciently to enable the interlocking sections thereof to be disengaged for the purpose of removing the warp beam.

In the operation of the device the parts are assembled as illustrated in Fig. 1, with the adjusting screw 39 so positioned as to cause the stop 36 to impose the desired tension upon the brake through the brake lever. As the lay is oscillated to beat up the filling, the sword upon each forward movement of the lay engages the lug 35 on the arm 32 just before the reed engages thefilling which is to be beaten in the fell of the cloth, thereby drawing the link 29 and operating the brake lever to exert a suficient tension upon the brake to lock the warp beam against rotation.

WVhen the lay moves rearwardly the lock ing pressure upon the brake drum is soon released and the arm 25 of the brake lever engaged with the stop 36, thus restoring the normal light tension upon the warp. When it is desired to rotate the warp beam freely or to remove the warp beam, the retainer tO is swung upwardly out of the path of the extension 38 of the stop so that the pressure of the latter against the brake lever is entirely removed, thereby removing all tension of the brake upon'the drum and enabling the ends of the section of the brake to'be be removed and replaced.

. It will be understood that the embodiment of the invention disclosed herein is illustrative and not restrictive, and that various modifications in construction and arrang ment of parts may be made within the spirit and scope of the following claims.

Having thus described my invention, what I claimas new and desire to obtain by Letters Patent is: i

l. Warp tension controlling mechanism for looms, having a warp beam provided with a friction drum and a brake band anchored at one end engaging said drum, comprising a lever connected to the other end of said brake band, an adjustable stop engaging said lever adapted to maintain a constant normal tension upon said brake band and means operating upon said lever when the lay reaches a predetermined position in its beat-up to cause said brake band to lock the warp beam against rotation.

2. Warp tension controlling mechanism for looms having a warp beam provided with a friction drum comprising a brake band anchored at one end engaging said drum, a brake lever connected to the other end of said brake band, having a main section fulcrumed upon a pivot on the loom side and a supplemental section also fulcrumed upon said pivot, yielding means connecting said lever sections and means operating upon said lever when the lay reaches a predetermined position in its beat-up to cause said brake band to lock the warp beam against rotation.

a 3. arp tension controlling mechanism for looms having a warp beam provided with a friction drum comprising a brake band anchored at one end engaging said drum, a brake lever connected to the other end of said brake band, having a main section fulcrumed upon a pivot on the loom side and a supplemental section also fulcrumed upon readilv detached so that the warp beam can said pivot, yielding means connecting said band to lock the warp beam against rotaband anchored at one end engaging said drum, a brake lever connected to the other end of said brake band, having a main section fulcrumed upon a pivot on the loom side and a supplemental section also fulcrumed upon said pivot, yielding means connecting said lever sections and means operating upon said lever when the lay reaches a predetermined position in its beat-up to cause said brake band to lock the warp beam against rotation, a stop pivotally mounted on the loom frame engagin said lever, a bracket pivotally mounted on the loom frame having an adjusting screw engaging said stop, said bracket being so mounted as to be removable from the path of said stop to enable the stop to be released from engagement with said lever.

5. Tarp tension controlling mechanism for looms, having a warp beam provided with a friction drum comprising a brake band anchored at one end engaging said drum, a lever connected to the other end of said brake band, an adjustable stop engaging said lever operating to impose a predetermined tension upon said brake band, and means connected to said lever operable by the movement of the lay, when the lay reaches a predetermined position in its beatup to cause said brake band to lock the warp beam against rotation.

6. arp tension controlling mechanism for looms, having a warp beam provided with a friction drum comprising a brake band anchored at one end engaging said drum, a lever connected to the other end of said brake band, an adjustable stop engaging said lever operating to impose a predetermined tension upon said brake band, an adjustable link connected to one end of said lever and at its other end to an arm carried by the lay supporting shaft and means on said arm adapted tobe engaged by the sword when the reed of the lay is in close proximity to the fell of the cloth.

7. Warp tension controlling mechanism for looms having a warp beam provided with a friction drum comprising a brake band anchored at one end and engaging said drum, a lever connected to the other end of said brake band, an adjustable stop engaging said lever operating to impose a predetermined tension upon said brake band, a link connected at one end to said lever, an arm pivotallyconnected to the other end of said link having means adapted to be engaged by the sword upon the beat-up of the lay, said arm being pivotally connected to the rocking shaft upon which the lay is supported, whereby the lower end of said arm is movable with the sword and the arm also movable relatively to the movement of the sword.

8. arp tension controllingmechanism for looms having a warp beam provided with a friction drum comprising a brake anchored at one end having separable interlocking hooked sections engaging said drum, actuating means connected to the other end of said brake, means for releasing said actuating means to permit detachment of said interlocking sections whereby the warp beammay be readily removed.

9. arp tension controlling mechanism for looms having a warp beam provided with a friction drum comprising a brake anchored at one end and formed of detachable interlocking sections engaging said drum, a lever connected to the other end of said brake, .means for actuating said lever to lock said warp beam against rotation when the lay reaches a predetermined position in its beat-up and adjustable means engaging said lever, for adjusting the normal tension upon said brake, adapted to be released from said engagement to permit detachment of said interlocking sections, whereby the warp beam may be readily removed and replaced.

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

HENRY N. YOUNGQUIST.

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