US1666872A - Let-off for terry looms - Google Patents

Description

April 17, 1928. 1,666,872

H. A. DAVIS LET-OFF FOR TERRY LOOMS Filed Feb. 23, 1924 3 Sheets-Sheet 1 lnvenTor.

Harry A. Davis by/wMWJ M ATTys.

April 17, 1928. 1,666,872

H. A. DAVIS LET-OFF FOR TERRY LOOMS Filed-Feb.23, 1924 5 Sheets-Sheet 2 lnvenTor.

Harry A. Davis WWW AITyS.

April 17, 1928. 1,656,872

' H. A. DAVIS LET-OFF "FOR TERRY LOQMS Filed Feb. 23, 1924 3 Sheets-Sheet 3 Fig.3.

Patented Apr. 17,

LE, MAssAcH snTTsQAss IGNoa To DRAPER conrona- MASSACHUSETTS, A CORPORATION or MAINE.

HARRY A. DAVIS, OF HOPEI JA TION, OF HOPEDALE,

LET-OFF s P TENT OFFICE m. TERRY Looms.

Application filed February as, 1e24.,seria1 n 694,557.

This invention relates. to the terry loom such'as commonly employed ,for weaving double pile fabrics employed in the manufacture of Turkish towels. 5 in the weaving of such It is important fabric that there shall be woven sections of plain fabric as well as sections of pile fabric. tlons are alternated in These secstripes as desired and the width and position of the sections is usually determined by which automatically governs the change from plain to t the terry loom there One set is carried by warp beam suchas e The other set known carried by and warp beam and these erry weaving and vice versa.

a pattern mechanism In are two sets of warps. and runs off from a mployed in any loom. as the terry warps is runs off from a separate terry terry warps form the loops of the pile fabric.

The present invention I provision of means for "effecting object the has for its chief the control of the terry warps so as to secure satisfactory results especially in the weaving of the plain sections of the fabric.

The object of the invention is further to provide a friction letwarp otf means for the terry beam which shall exert an intensified or extra amount of friction during'the weaving of the plain sections of fabric and thus insure an even and regular quality of plain weaving.

The object of the invention is further .to provide means for controlling the iQITSlOIl on the terry warps to make it substantial sion upon the ground warps during insure a. regular plain weaving and thus weave.

The object of provide means during plain weaving so as ly the same as the tenplain the invention is further to for insuring that the terry loops shall be maintained of uniform and full length to theend of the zone of terry weaving and shall not decrease in length adjacent the zone of pla The object of the invention is provide an actuator for fication of the amou terry warp jected to in weaving.

further to effecting the intensint of friction on the beam which shall not be subany strain due to the normal or predetermined amount of friction on the terry warp beam imposed during terry weaving.

The object of the invention is further to provide a combinatio for the terry Warp bea 'for the terry warps n of m and a positive let-off together with means vember 25,

the construction shown in a. friction let-off acting to render the positive let-01f active and to cause the friction let-off to exert a predetermined amount of frictionnpon the full' forward stroke beat of the reed for forming the terry loops, to cause the friction let-ofl to exert the said predetermined 9 amount of friction and to render the positive let-off inactive during the partial forgreater amount of friction and to render the positive let-off inactive during plain weavmg g Y These and other objects and features of the invention will appear more fully from the accompanying description and drawings and will be particularly pointed out in the claims.

The invention in its preferred form is shown as applied to a familiar type of terry loom such, for example, as that illustrated in the patent to Merrill No. 1,322,715, No

well known and familiar to those skilled in the art it is only necessary herein to illustrate and describe such a. loom in so far as it is particularly concerned with the present invention.

In the drawings:

Fig. 1 is a front'elevation of the'end of the terry warp beam, its support,'and certain of the mechanism associated therewith and necessary to a disclosure of the inven-. tion.

Fig. 2 is a side elevation of a portion of Fig; 1. 1

Fig. 3 is a side elevation partially broken away and partially in vertical cross section showing therear portion of the loom.

Fig. tis a detail in side elevation showing the opposite end of the terry warp beam.

The loom comprises the usual side frames 1. These side frames rest upon the floor 2 and are connected by the usual girders and support the usual shafts and rods.

The warp beam 3 carrying the I ground warps is supported by its shaft 4 at the rear of the loom frame in the usual manner. The ground warps 5 extend from this warp beam over the usual whip roll 6 forward through the usual harnesses, reed, and so forth (not shown) to the front of the loom. The control of and tension upon the ground warps 5 nism such as employed in any regular loom.

1919. As this type of loom is c is provided by any suitable meehaof the terry warp beam 11.

' main under the usual tension.

Standards 7 and '8 extend up from the side frames at the rear of the loom. These standards at the top are provided I with roller bearings '9 upon which rest the trunnions 10 The terry warps 12 extends from the terry warp beam downwardly through a positive let-off mechanism of a type similar to that shown in the patent to Davis No. 1,322,671, November 25, 1919, and then forwardly along with the ground warps. I

In thistype of 100111 the terry weaving is effected by varying the forward extent of the beat up movement of the reed. For several picks the reed has only a partial forward stroke toward the fell of the clotlrso that a gap. is leftbe'twe en the picks and the fell. The reed is then given a full forward stroke to beat up the several picks at once. (hen this full beat up the reed takes place the terry warps are under a predetermined but slight tension and are usually positively fed forward or let off from the warp bea-m whereas the ground warps re- Hence the portions of the terry warps which are between the group of picks and the fell of the cloth are looped on both sides of the fabric as the full beat up of the reed occurs.

When a section of plain weaving is made the reed has its full beat up movement fol" I lowing each pick and hence no loops are formed in the terry warps. But diliiculty has been experienced in making a perfect plain weave because of the inequality of tension betweenthe terry warps and the ground warps. The present invention provides for securing the requisite tension on the terry warps to correspond with that on the ground warps and thus insure a regular and perfect plain weave while at thesame time it provides for or permits the requi ite tension and let-off of the terry warps during terry weav- It is particularly desirable that the terry loops shall be maintained of the same length or height (throughout each zone of terry weaving. Heretofore difficulty has existed in this respect when the clnuige takes place particularly from terry weaving to plain weaving because the terry loops have been drawn down or shortened. The present invention in.-;ures that the terry loops shall remainof the same length clear upto the zone of plain weavingand shall not be shortened. or drawn down when the change takes place,

Various mechanisms may be provided for giving the partial and full forward strokes to the reed and for the purpose of disclosing the presentinvention it is assumed that such means as shown in the Merrill patent above mentioned are to be used. construction the control of thechange from In that plain weaving to terry weaving and vice versa is effected through a pattern mechanism including the pattern chain 13. An actuator 1 1 is pivoted at 15 and has a connector 16 which extends to and controls the beatarp motion. It. is assumed that when a riser 17 of the pattern chain holds the actuator 141 elevated the beat-up motion functions to perform plain weaving and that when the riser l7 passes from beneath the actuator l l allowing it to fall to the position shown in dotted lines in Fig. 1, the beat-up motion functions to perform terry weaving. v

In the construction illustrated the terry warps are under the control oftwo separate mechanisms, first, a positive let-off mechanism of the type shown in the Davis intent 1,322,671 above niei'itioned, and second, a

friction let-off which acts to e iert'a predetermined constant amount of friction. du'riii-g terry weaving and during plain weaving. k

The positive let-oil mechanism is located between the terry warp beam an'dthe reed. This mechanism, whichniaybe any. suitable construction, 'is'show'n in Fig. 3 as generally similar to that of the before mentioned Davis Patent No. 1,322,671. The terry warps 12 run from the terry warps beam under an idler roll 18 and thence around the rough surfaced let-off roll 19 thence over and under the idler roll 20 and thence forwardly to the harnesses. 'A gear 21 is fast with the roll 19 and is actuated by a pinion 22 on a shaft 23. The shaft carries a. ratchet wheel 24c which is actuated by a springpressed, pawl 25. This pawl 25 is pivoted to one end of a pivoted pawl lever 26 the other end of which is connected by a link 27 to a bell crank 28 pivoted at 29. This bell crank has a lost motionronn' ction 30 with a rod 31 adjustably connected at 32 to a crank arm 33 on the beat 'up mo tion rock shaft 8 1 corresponding to that in the before mentioned Merrill and Davis patents. Inthis type of mechanism a cam lever 35 is loosely hung at itsfront end 'on the shaft 34 and carries-a at its rear end a'roll 3G traveling in the groove 37 of the cam 38 secured to the hack shaft 39. arranged to be coupled to and uncoupled from the shaft 35 and during theterry wcaving it remains coupled to the shaft 3% and hence the shaft is rocked hack and forth every revolution of the cam 38. This cam is so shaped that the shaft is rocked every full beat-up stroke of the reed or in the illustrative instance at every third forward beat of the lay. During plain weaving the a greater amount lever 35 is uncoupled from the shaft, so that This lever 35 is ing the partial forward strokes of the reed in terry weavingbecause the cam groove 37 is so shaped that no movement is givento the shaft 34 and consequently to the rod" 31 during those strokes.

It will thus be seen that the positive let-off mechanism is rendered inactive during plain weaving and also during the partial forward strokes of the reed in terry weaving-but is rendei'edactive upon the full forward stroke beat of the reed for forming the terry loops.

The friction let-off is shownin detail in Figures 1 and 2 and is conveniently applied to the warp beam. For this purpose the terry warp beam 11 is provided at one head with a drum 40. A flexible friction band 41 surrounds the greater portion of the periphery of the drum and is arranged so that its tension or pressure on the drum maybe adjusted as desired and so that a predetermined amount 'of tension or friction may be exerted during terry weaving or preferably j ust sufiicient to prevent over-running. This friction let-off mechanism is also arranged to act during plain weaving to give any required degree of tension to the terry warps and thus produce the same tension on the terry warps as on the ground warps and in addition this mechanism is arranged'to exert the normal or predetermined tension during terry weaving so as to enable the terry warps to be under the control of the positive let-off mechanism by which the terry warps are fed forward during the formation of the loops. In the construction illustrated a bracket 42 is secured to the inner faceof the standboss 48 is adjustably secured by means of a' set screw 49 to the inner end of the rod and has projectinginwardly therefrom 'a flat apertured head 50. A rod 51 passes through the aperture-in the head and: has a T shaped head 52 resting in a loop atone end of theband 41. This rod at its'op'posite end is threaded and provided with a thumb nut '53. A spring'54 extends between the nut and the head 50. v

The construction at the other end of the band 41 is similar. In this case the boss 55 nut and the head. 'juncts thus constitutes a movable support the nut and the head.

is 'pivotally mounted at 56 on the bracket 42 and has an arm 57 projecting laterally and connected by a link 58 with the actuator 14.

The boss 55 has adjustably secured therein by the set screws 59 the rod 60 carrying at its inner end the boss 61 provided with a fiat apertured head 62. A similar" rod 63'provided with a T-shaped head engages a loop in the other end of the band 41, passes through the aperture of the head 62 and 1 carries the thumb nut '64 threaded thereon with the spring 65 interposed between the I The boss 55 with its adfor the end of the friction band;

"The boss 55 is shouldered at 66 and this shoulder cooperates with a shoulder 67 and a sleeve fast to the bracket 42 so as to limit the upwai-dinovement of the rod 60 and the downward movement of the arm 57. Consequently there can be no strain on the actuator 14 or the pattern nechainism when these shoulders: are in engagement which is the normal condition during terry Weaving.

Since the direction of rotation of the terry warp beam and its drum 40 is toward the spring 54 this spring may be of less strength than the spring 65. The thumb nuts 53 and 64 enable the amount of friction applied to the drum 40 and consequently the tension on the terry warps to be adjustedas required.

It is desirable also in order to balance the construction to provide a similarnormal amount or predetermined amount of friction at the opposite end of the terry-warp beam and forthat purpose the construction. shown in Fig. 4 may be employed. Therein a drum v68 similar to the drum 40. is secured to the warp beam. A flexible friction band 69 encircles .the greaterv portion of this drum and is secured at one end 70 too. lever 71 fulcrumed at 72 on the standard 8. A vrod 73 provided with a. T-shaped head engages a loop in the other end of the band 69, passes through an aperturein the other end of the lever 71 and carries a thumbnut 74 threaded thereon with a. spring 75 interposed between This enables the tension on the band 69, and consequently the friction exerted upon the drum '68, to be adjusted as desired.

\Vhen the change takes place from terry weaving to plain weaving the riser 17 of the pattern chain raises the actuator 14 from its normal position shown in dotted lines in Fig. 1 to the full line position. Immediately through the link connection 58 the arm 57 is rocked thus suddenly compressing the spring 65 and intensifying the'ainount of friction applied to the drum 40. This action takes 1. A terry loom comprising a terry warp beam, a friction let-oil" for the terry warp beam, means acting to cause said let-off to exert a predetermined amount of friction on the terry warp beam during terry weaving, automatically controlled means for changing from terry to plain weaving, and means acting simultaneously with such a change and prior to the first beat-up of plain weaving to effect apredetermined intensification of the amount of friction exerted on the terry warp beam, thereby to maintain the terry loops of uniform and full length to the end of the zone of terry weaving and to begin the zone of plain weaving perfectly.

2. A terry loom comprising a ground warp beam and means for producing the required tension on the ground warps, a terry warp beam, a friction let-off for the terry warp beam, means acting to cause said let off to exert a predetermined amount of friction on the terry warp beam during terry weaving, automatically controlled means for changing from terry to plain weaving, and means acting simultaneously with such a change and prior to the first beat-up of plain weaving to effect an intensification of the amount of friction exerted on the terry warp beam sufficient to make the tension on the terry warpsto correspond to the tension on the ground warps, thereby to maintain the terry loops of uniform and full length to the end of the zone'of terry weaving and to begin the zone of plain weaving with equal tension on theterry and ground warps.

3, A terry loom comprising a terry warp beam, a friction let-off for the terry warp beam, means acting to cause said let-off to exert a predetermined amount of friction on the terry warp beam during terry weaving, means for adjusting the said predetermined amount of friction, automatically controlled means for changing from terry to plain weaving, and means acting simultaneously with such a change and prior to the first beatup of plain weaving to effect a predetermined intensification of the amount of friction eXerted'on-the terry warp beamythereby "to maintain the terry loops of uniform and full length to the end of-the zone of terry weaving and to begin the zone of plain weaving perfectly.

4:. A terry loom comprising a terry warp beam,a friction let-off for the terry warp of friction exerted on the terry warp beam and acting simultaneously with the change from plain to terry weaving and prior to the first beat-up of terry weaving to restore the said predetermined amount of friction on the terry warp beam, thereby to maintain the terry loops of uniform and full length throughout the zone of terry weaving and to "effect perfect plain weaving throughout the zone of :plain weaving.

5. A terry loom comprising a terry warp beam, a friction let-off for the terry warp beam, means acting to cause said let-off to exert a predetermined amount of friction on the terry warp beam, an actuator which acts to effect-the change from terry weaving to plainweaving and vice versa, and means operated by and simultaneously with said actuator upon effecting the change from terry weaving to plain weaving and prior to the first beat-up of plain weaving to ef feet a predetermined intensification of the amount of friction exerted'on the terry war-p beam and upon effecting the change from plain to terry weaving and prior to the first beat-up of terry Weaving to restore the said PIGClBtGIIIIlDG Cl amount of friction on the terry war-p beam, thereby to maintain the terry loops of uni-- form and full length throughout the zone of terry weaving and to effect perfect plain weaving throughout the, zone of plain weaving. I

6. A terry loom comprising a terry warp beam, a friction let-off for the terry warp beam, means acting to cause said friction letoff to exert a predetermined amount of friction on the terry warp beam during terry weaving and a greater amount during plain weaving, apositive let-off mechanism for the terry warp located between the terry warp beam and the reed, and means acting to render said positive let-off mechanism active at the full. forward stroke beat of the reed in terry weaving and to render it inactive during the other forward strokes of the reed in both terry an'diplam weaving whereby the :positive let-oif acts on the terry warps upon the full ,forwa-rd stroke beat of the reed in forming the'terry loops, the fricti'onlet-oif exerts the said predetermined amount of '7. A terry loom comprising a terry warp beam, a friction let-off for the terry warp beam, a positive let-off mechanism for the terry warp located between the terry warp beam and themed, and means acting to render the positive let-off active and to cause the friction let-oif to exert a predetermined amount of friction upon the full forward stroke beat of the reed for forming the terry loops, to cause the friction let-off to exert the said predetermined amount of friction and to render the positive let-off inactive during the partial forward strokes of the reed in terry weaving and to cause the friction letoif to exert a greater amount of friction and to render the positive let-off inactive during lain Weaving.

8. A terry loom comprising a terry warp beam, a friction let-off for the terry warp beam, means acting to cause said let-ofi to exert a predetermned amount of friction on the terry warp beam, an actuator which acts to effect the change from terry weaving to plain weavingand vice versa, means operated by said actuator upon effecting the change from terry weaving to plain weaving to intensify the amount of said friction and upon effecting the change from plain weaving to terry weaving to restore the said predetermined amount of friction, and means for preventing the friction let-off from exerting any strain on the actuator during terry weaving.

9. In a terry loom, a terry warp beam, a drum rigid and concentric therewith, a frame for supporting the beam, a friction band partially surrounding the drum, a tension spring connecting one end of the band to the frame, a support movably mounted on the frame,

change suddently to move thesupport a predetermined distance against the tension of the second spring, thus immediately to effect a predetermined intensification of the, friction exerted by the band on the drum during plain weaving. I

10. In a terry loom, a terry warp beam, a drum rigid and concentric therewith, a frame for supporting the beam, a friction band partially surrounding the drum, means connecting the end ofthe band toward which the drum is rotated to the frame, a support movably mounted on the frame, a tension spring connecting the other end of the band to the support, automatically controlled means for changing from terry to plain weaving, and means acting simultaneously with such a change suddently to move the support a predetermined distance against the tension of the spring thus imme'd iatel 'to effect a'predetermined intensification o the friction exerted by the band on the drum during plain weaving.

11. In a terry loom the construction defined in claim 9 together with means for limiting the movement of the support in the opposite direction to that which it is moved to intensify the friction whereby a minimum predetermined amount of friction is exerted by the band on the drum without exerting strain on the means for moving the support.

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

' HARRY. A. DAVIS.

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