US2279786A - Stop motion for drawing frames - Google Patents

Description

April 14, 1942. E; HOLT I STOP MOTION FOR DRAWING FRAMES Filed Sept. 27, 1940 3maentor April 14, 1942. E. M. HOLT S'TOP MOTION FOR DRAWING FRAMES Filed Sept. 27, 1940 4 Sheets-Sheet 2 Enwm 'M.

attorneys April 14, 1942. HOLT 2,279,786

STOP MOTION FOR DRAWING FRAMES 7 Filed Sepf. 27, 1940 4 Sheets-Sheet s EDWIN M- HOLT April 14, 1942. E. M. HOLT STOP M'oTIbN FOR DRAWING FRAMES v u. mm 4 m H. t FR M 3 O a m l\\fia N a h W, H n Qm m .m. MR

Filed Sept. 2'7, 1940 llll'll lll.

' causes.

Patented Apr. 14, 1942 UNITED STATES PATENT OFFICE STOP MOTION FOR DRAWING FRAMES Application September 27, 1940, Serial No. 358,673

1 Claim.

This invention relates to textile apparatus and more especially to a fly frame stop motion which will automatically stop the frame when a strand or roving becomes broken.

In the manufacture. of cotton yarns, the cotton which is delivered to the mill from the gin in bales is thoroughly cleared of foreign matter and immature fiber. It is-then run through pickers and is formed into rolls, called laps, after which it is carded and condensed into a strand known as sliver from whence it may be passed directly to draw framesfor parallelization-of the fibers. It is delivered from the drawing frames as drawing sliver. From the-final drawing process, it is run throughamachine known as a fly frame which has as its object the reduction of the thickness of the sliver, the evening of the-product, the twisting of the strand, now known as roving, and the winding of the strand or roving onto a bobbin.

Until the advent of the so-called long draft roving, the roving processes usually consisted of three systems in the steps as slubbers, intermediates and fine frame, but with the development of the long draft for fiy frames, the roving processes have been reduced to two processes and in some cases to one, depending on yarn counts desired.

The stock passing through the roving or fly frame process is drawn from cans, or bobbins if not the first roving process, through drafting rolls and through fiyers where'proper twist is inserted and finally wound on to bobbins. In passing from the drafting rolls to the flyers, it often occurs that the strand will *be broken either because of small weak placesin the strand, the fiyer becoming clogged, or various other When this occurs unless the frame is stopped and the break repaired the broken end will fly into otherstrands and cause them to break also. An attendant usually tends several of the fly frames, each of which runs a multiplicity of spindles andstrands. The alertness with which he watches such breaks affect both the quantity and quality of the roving produced. The old type of conventional fiy frame occupied a comparatively small floor space and an attendant could see and stop the frame quickly when the strand broke, but with the advent of the long draft frame, occupying a greater floor space, it becomes increasingly difficult for the frame tender to see and correct such breaks.

Therefore, it is an object of the present invention to render the fly frame inoperative automatically when the strand breaks and thus prevent the occurrence of the character just described.

More specifically, it is an object 0f this invention to provide a fiy frame having sets of drafting rolls between which a strand or roving is adapted to pass, in combination witha cloth covered roll for contacting one of the above named rolls and a mechanism controlled by the accumulated roving on the roll for automatically stopping the fly frame. When a strand or roving breaks, the loose end willbe engaged and wound around the roll. As more material is wound upon the roll, the diameter will be increased, thus forcing the roll away from the drafting roll. This movement of the roll is utilized to stop the -fiy frame so that :the broken end can be mended.

Some of the objects of the invention having been stated, other objects willappear as the description proceeds when taken in connectionwith the accompanying drawings, in Which- Figure 1 is an isometric viewof the central portion of a roving frame and embodying some features of the present invention;

Figure 2 is an isometric view of the end-portion of the roving frame shown in Figure '1;

Figure 3 is a transverse vertical sectional view taken along the line 33 in Figure 1;

Figure 4 is a longitudinal sectional view taken along line 44 in Figure 1;

Figure 5 is a transverse vertical sectional view taken along line 5--'5 in Figure 1;

Figure 6 is an enlarged sectional view o'f the central portion of Figure 5 showing the manner in which the end of a -broken strand or roving is wound around the stop motion;

Figure 7 is an elevation of the front set of drafting rolls and the associated stop motion rolls;

Figure 8 is an isometric view showing a modified form of the invention employing an electromagnet for effecting the stopping of the fly frame;

Figure 9 is a transverse vertical sectional view taken along line 99 in-Figure 8;

Figure 10 is a detail view showing the positions of the mercury switch;

Figure 11 is a longitudinal sectional view taken along line ll--H in Figure 8.

Referring more specifically to the drawings (Figure 2), the numeral '10 denotes the head on the driving end of a roving frame of a common type. This head has rotatably mounted therein a longitudinally disposeddrive shaft 1 l uponwhich a fixed pulley l2 and a loose pulley l4 aremounted. A suitable driving belt I5 is shown mounted upon the fixed pulley I2, but since both pulleys are of the same diameter, the belt may be shifted from one pulley to the other. The belt I5 is encircled by a belt shifter I6, said shifter |6 being secured upon the end of a shaft I1 which, in turn, is slidably mounted in the frame I0. Shaft I1 is also mounted in suitable brackets or uprights I8 and these brackets are in turn supported by table member I9 which supports other parts of the fly frame such as roll stand brackets 20. I

By observingFigures 1 and 4, it will be seen that the shaft I1 has fixedly secured thereon a collar by any suitable means such as a screw 26. Rotatably and slidably mounted around the shaft I1, and between thecollar 25 and one of the upright brackets I8, is a cylindrical member 21, said cylindrical member having a bore 28 therein for the accommodation of a suitable compression spring 29. This compression spring normally tends to force the cylindrical member 21, the collar 25, and the shaft I1 to the left in Figures 1, 2 and 4. In order to latch member 21 in position against the pressure of spring 29,

a suitable peripheral groove 30 is provided in the cylindrical member, said groove being adapted to accommodate the upper edge of the free end of a lever 3|. One end of the lever 3| is pivoted as at 32 to bracket 33; whereas the free end of the lever is slidably mounted in a slot 34, which is cut in the upstanding leg of bracket 35. In order to normally hold the upper edge of the lever 3| in engagement with the groove 30, a

suitable spring 31 is employed (see Figure 4) It is quite evident that when the upper edge of the free end of the lever 3| is disposed within the peripheral groove 30, the cylindrical member 21 will not be permitted to move to the left and consequently, the shaft I1 will remain in the position shown. But when one end or roving breaks, certain mechanism to be hereinafter described will release the free end of lever 3| from the peripheral groove 30 to thereby allow the spring 25 to move member 21 and shaft 11 to the left which, in turn, will move the belt shifter I6, causing belt I5 to move from the fixed pulley I2 to the loose or idler pulley I4.

Referring again to Figure 1, it is seen that the shaft I1 has the lower end of bracket 40 secured thereto, the upper end of the said bracket being secured to a longitudinally disposed shaft M which is mounted for longitudinal sliding movement in bracket I8. The end of shaft 4| has pivotally secured thereto as at 42 a link 43 which link is also pivoted to the intermediate portion of lever 44 as at 45. The lever 44 is pivoted to a vertically disposed shaft 41. When the belt I5 is disposed upon the loose pulley I4 and it is desired to place the machinein operation, it is necessary to again shift the belt back to the fixed pulley I2. To do this, the lever 44 must be rotated in a clockwise manner about shaft 41 thereby causing the shaft 4| to move longitudinally away. from the observer in Figure 1; carrying with it the bracket 40 and the shaft I1. Of course, when the shaft I1 moves away from the observer in Figure 1, the belt shifter I6 (Figure 2) will be moved away from the observer, thereby shifting the belt I5 from loose pulley I4 to fixed pulley I2. When the shaft I1 has been moved far enough away from the observer to cause the peripheral groove 3|] to coincide with the top edge of the free end of lever 3|, the spring 31 will force the upper edge of this lever into the groove 30 to If it.

latch the cylindrical member in position. If it is desired to manually stop the machine when the lever 3| is engaging the groove 30, it is only necessary to rotate lever 44 in a counter-clockwise manner in Figure 1. This rotation will cause members I1, 25, 4|, I8 and I5 to move toward the observer while the cylinder 21 remains stationary.

Referring now to Figures 1 and 5, it will be noted that the fly frame is equipped with fluted bottom rolls 50, 5|, 52, and 53, said rolls having top rolls 54, 55, 56 and 51, respectively mounted thereon. Between the sets of top and bottom rolls, suitable strands or rovings 58 are adapted to pass from the drafting and parallelization process. Usually the strands 58 are drawn from suitable cans 59 upwardly over lifting rolls 60, thence to second set of lifting rolls 5|, from whence they pass between the drafting rolls just described. From the drafting rolls the strands pass to suitable fiyers 62 and are deposited on bobbins 63.

As heretofore stated,; it frequently happens that a strand or roving 58 breaks at a point between the front rolls 50 and 54-and the flyers 52, thereby causing the loose end to engage the adjacent unbroken strands and to break them also. The present invention contemplates the construction of a stop motionroll 61 which will engage the broken loose end and wind it therearound. The roll 61 is driven by peripheral contact with the drafting roller 58. As the roving on the roll 61 builds up in diameter, the roll moves away from the drafting roll. This stop motion roll, as it moves away from the drafting roll 58, will actuate the lever 3|, previously described, and cause it to move out of the peripheral groove 30 thereby releasing the cylindrical member 21 so that the spring 29 can move the shaft I1 and belt IG-longitudinally of the frame and shift the belt I5 from the fixed pulley to the loose pulley.

Roll 81 is covered with felt or cloth, or is otherwise provided with a surface to which the roving will cling to cause the broken roving to be attached to the roll 61. The roll 61 has its ends rotatably mounted-in the forked ends of suitable levers 10. These levers 10 are pivoted intermediate their ends as at 1| to the roll stands 20. Figure '1 illustrates the apparatus employed in supporting the ends of these stop motion rolls and 1 Figure 1 (also see Figure 3), has fixedly secured thereon a short lever 18, and the free end of this lever is adapted to rest. upon the upper free end of another lever 19, said lever 19 being rotatably secured as at to the central portion of lever 3|, previously described. Also secured to the lever 19 as at 80 is an upstanding arm 82 which has a forked portion 83 on the upper end thereof for encircling a collar 84, said arm being rotatably mounted with respect to lever 3|.

Collar 84 has integral therewith, a cam 85. both the collar and the cam being fixedly secured on shaft 86. The shaft 86 has a-spiraled gear 88 on one end thereof (see Figure l), and the other end has a beveled gear 89, said beveled gear meshing with another beveled gear 90 on longiiuslin l' dis gscd name m1 s af 9. ar

s a 9| a a t d to any the li in rolls ts lifting rolls "6i will be moved at the proper speed todeliver the roving '58 to the drafting rolls.

It will be noted by referring to Figure 3 that the upper portion of the arm "82 has a -T-shaped bar 95 adjustably secured thereto by any suitable means such as a bolt 96. When the parts are .in the positions shown in Figures 1 and 3, the upper end of the bar 95 will not be engaged by the periphery of cam 85 as it rotates. However, when the arm 82 is allowed to pivot in a counter-clockwise manner, about pivot point 89, the upper end of this bar will be contacted by the periphery of cam 85 to thereby force the arm 82 as well as the free end of lever 3I downwardly. Of course, upon the forcing of the lever 3| downwardly, the upper edge of this lever will be moved out of the peripheral groove 30 to thereby effect a release of the cylindrical member 21 to cause the belt I to be shifted from the fixed pulley 2 to the loose pulley I4. A suitable counterweight 98 is provided so that the members I9 and 82 will normally rotate in a counter-clockwise manner about point 89 when released. The counterweight is secured to the upper portion of the arm 82 by means of a suitable bolt 99. This bolt penetrates a slot IUD in the counterweight 98 and has its end threadably embedded in the arm 82. The slot permits the adjustment of the counterweight to suit various operating conditions.

Let us suppose that a strand or roving 58 breaks between the front rolls 59 and 54 and the fiyers 62. The loose end will be engaged by the roll 61 and wound therearound in the manner shown in Figure 6. As the diameter of the fibers on the roll is built up, the lever arm III will be rotated in a counter-clockwise manner in Figures 1 and 5 thereby causing the members I2 and I3, as well as the shaft I4 to rotate in a clockwise manner. This clockwise manner rotation of shaft I4 will cause the lever I8 to rotate in a clockwise manner in Figure 3, thereby allowing the counterweight 98 to rotate the lever I9 and arm 82 in a counter-clockwise manner in Figure 3 to a point where the upper end of T-bar 95 will be disposed in the path of the periphery of cam 85. Upon the rotation of the cam 85 with the T-bar in this position, the arm 82, as well as the free end of lever 3| will be pushed downwardly until the upper edge of lever 3| is disengaged from the peripheral groove 36. Of course, upon this disengagement, as heretofore stated, the shaft I! will be shifted longitudinally to effect the stopping of the machine. At this time, the broken end can be mended, after which the lever 44 will be rotated about shaft '4'! until the spring 29 (Figure 4) is compressed sufiiciently to allow the groove 30 to again accommodate the free end of lever 3I in the position shown in the drawings. It is desirable that the roll 6'! be covered with a suitable material such as felt or the like which will easily catch strands of roving.

Figures 8 to 11 inclusive show a slightly modified form of the invention in which an electromagnet is employed for effecting the tripping operation of cylindrical member 21. Fundamentally, the principle employed is the same as in the preceding form and therefore like reference characters will be given to like parts and a de- 'scription -of-ethe parts Whifih differ will be :given.

In "this form 0f the invention, it will be :noted that-the freeend of lever 3'Ia has pivoted thereto as at 465, the upperend-of a core I06, said core being slidably mountedina cylinder Illlcof magnetic coil I66. A spring I99 isdisposed beneath the freeend of the lever 3[ which normally forces so that the force of the spring 29 within cylindrical member 21 will not move the free end of the lever out of place. Leading from the coil I88 are suitable wires H2 and H3, the wire H3 having its other end attached to main current supply line II 4, and the wire I I2 having its other end connected to one end of a mercury tube switch H6. Also leading from the same end of the tube H6 is another wire H! which leads to main current supply line H8. The tube H6 is supported by a clamp I20 on the end of a shaft I2I, said shaft being rotatably mounted in bracket I8 and also having a pinion I22 fixedly secured to the other end thereof. This pinion meshes with a rack I23 which, in turn, is fixedly secured on the end of shaft I4 previously described.

During the normal operation of the machine the tube H6 is in the bold line position shown in.

Figures 8 and 10 at which time the mercury I25 therein has settled to the end removed from the wires H2 and H1 thereof. Upon the breaking of a strand 58, the roll 61 will wind the loose end therearound thereby causing the lever 19 to rotate in a counterclockwise manner (Figure 8) which at the same time will effect a clockwise rotation of shaft I4, and rack I23. This rotation of rack I23 will cause the shaft I2I and the tube H6 to rotate in a counterclockwise manner, that is the tube H6 will be rotated from bold line position (Figure 10) to dotted line position, allowing the mercury I25 to settle into the other end of the tube I I6, to close the circuit between wires H2 and H7. Upon the closing of the circuit the coil I08 will be energized to cause core I08 to be pulled downwardly. At the same time the free end of lever 3la will be pulled downwardly out of the peripheral notch 30 so that the cylindrical member 21 will be released to allow the spring 29 to move the cylindrical member 21 and its as sociated shaft Il longitudinally in a manner previously described. Of course, upon the movement of the shaft H, the belt shifter I6 and the belt I5 will be moved from the fixed pulley I2 to the idler pulley I4.

In the drawings and specification there has been set forth a preferred embodiment of the invention, and although specific terms are em In a drawing frame having a main driving shaft provided with tight and loose pulleys and a driving belt and having a longitudinally movable rod to shift saidbelt, in combination, a cylindrical member mounted on said rod, a coiled compression; spring enclosed within. said cylindrical member and encircling said. rod, afixed abutment engaged by one end of said spring and the other end of said spring abutting said cylindrical member, said spring normally forcing said rod to shift said belt, in combination, a cylinpulley, and said cylindrical member having a peripheral groove therein, a lever adapted to swing in a plane transverse to the path of movement of said rod and to be engaged in said groove to latch said cylindrical member and rod in a position to hold the belt on the tight pulley, a rotary member onto which a broken sliver passing through the drawing frame is adapted to fall frame, and said latter means including an elec- 10 tro -magnet, a connection from said magnet to said lever, and a switch device bodily responsive to the radial displacement of said rotary member.

EDWIN M. HOLT.

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