US1984068A - Carrier for braiding machines - Google Patents

Description

Dec. 11, 1934- M. KRISSIEP ET AL CARRIER FOR BRAIDING MACHINES Original Filed April 15, 1933 2 Sheets-Sheet 1 g g; w huh V H ..nl 11 vlu Ilium,

BY flermamus a Dec. 11, 1934. M. KRISSIEP ET AL 1,9311068 CARRIER FOR BRAIDING MACHINES Original Filed April 15, 1955 2 Sheets-Sheet 2 1 gga INVENTORS: W111i ssiqp 6. Hanna 1:,

BY 2 7% '7 ATTORN Patented Dec. 11, F334 sr'rs waists CARRIER F02, BRAIDING MACHINES Max Krissiep and Herman Staub, Wyomissing,

lPa.,

assignors to Textile Machine Works,

Wyomissing, Pa, a corporation of Pennsylvania Griginal application April 15, 1933, Serial No. 666,282. Divided and this application May 8, 1934, Serial No. 724,486

10 Claims.

multiplicity of rotatable and variously movable yarn carriers generally have included tension means to more or less uniformly feed the yarn from the yarn spools or cops, such means being arranged to effect stopping of the machine upon breakage of the yarn or thread.

The tension exerted upon the yarn by the carriers has not always been constant, frequently manifesting considerable variation in different working positions in the same machine. This has resulted in a certain non-uniformity of the braided product, as well as thread breakage, and

other failures, which it has generally been possible to remedy before becoming serious in View of the fact that the machines have rotated at a comparatively low speed.

In the case of high speed machines, however, additional problems are encountered, among which appears the desirability of eliminating as far as possible thread breakage, with consequent frequent stoppage of the mach ne and entanglement of loose ends of yarn among the moving parts, and non-uniformity of the work due to irregularity of tensions in the braid strands.

Accordingly, the present invention aims .to simplify and improve the construction of the braiding carriers and render them sensitive andpositive in action, so that the yarn tensioning or take-up member of the braiding carrier will function accurately and uniformly in controlling the yarn feeding rotation of the bobbin or yarn holder, thus adapting the latter particularly for the conditions met with in high speed operation of the braiding machine, in addition to providing carriers equally advantageous for use with low speed machines. Another object in line with the foregoing is-to enable the braiding carrier to efiect quick stoppage of the machine whenever a yarn breakage may occur.

In the case of certain braided products, the yarn may be unwound from a single carrier in a plurality of strands. When one strand or any number less than the total number of strands breaks and the machine continues in operation, defects in the braided product will almost surely occur before the trouble becomes apparent and can be corrected. Also, the broken strand may become badly tangled among the rapidlymoving parts. has for one of its objects the provision of means to stop the braiding machine practically immediately on the occurrence of a break of any strand or strands in a plural strand yarn.

With these and other objects in View, which will become apparent from the following detailed,

description of the illustrative embodiments of the invention shown in the accompanying drawings, the invention resides in the novel elements of construction, mechanisms and combination of parts in cooperative relationship, as hereinafter more particularly pointed out in the claims.

In the accompanying drawings:

Figure 1 is a side view,in elevation, of one form of a braiding carrier having certain novel features of the present invent-ion incorporated therein.

Fig. 2 is a partial side View taken from the opposite side of Fig. 1 and showing an elevation of the control levers in working tension position.

Fig. '3 is a view similar to Fig. 2 illustrating the control levers in idle tension position.

Fig. 4 is a transverse sectional view, partly broken away, taken on the line 4-4 of Fig. 1.

Fig. 5 is a side elevation illustrating a modified form of carrier for feeding a plurality of strands simultaneously from a single yarn spool or package.

Accordingly, the present invention also Fig. 6 is an end elevation of the strand control means for stopping a carrier, looking from theinside, certain of the parts being broken away to more clearly show others.

Fig. '7 is-a view similar to Fig. 5, showing the plural yarn-breakage stop-control in operation.

Fig. 8 is a transverse sectional view partly broken away and taken on the line 8 8 of Fig. 5.

Fig. 9 is a view similar to Fig. 8 but taken on the line 99 of Fig. 7.

Fig. 10 is a'partial side view taken from the opposite side of Fig. '7.

Fig. 11 is a transverse sectional View through the thread guide upright, taken on the line 11-11 of Fig. 6, on a slightly enlarged scale.

A braiding carrier is usually provided with a body portion whereon the yarn supply is carried, generally upon a spool or bobbin, and a foot or guiding portion which cooperates with other parts of the braiding machine.

Referring to the accompanying drawings, Fig. 1 represents one embodiment of the invention including a bobbin 1 upon which is mounted a yarn or strand package 2. The lower formation or body portion in this instance is of a construction adapted for a particular commercial type of braiding machine for which purpose the carrier includes a foot portion comprising spaced plates 33, connected by a shuttle piece 3*, and including a downwardly extending pin 3 for engagement with the drive gears of the braiding machine.

Integral with the lower portion is an upright base member 4 upon which is pivotally secured a bifurcated yarn tensioning or take-up control lever 5 and a pivoted locking pawl lever 6. A spindle 7 which extends upwardly from the base member 4, receives the yarn or strand supply 2. Desirably, the yarn supply is carried upon the bobbin 1, which may be of usual con struction, with downwardly extending circumferentially arranged spaced teeth or serrations 9 adapted for engagement with the locking pawl 6 whereby the bobbin and yarn supply may be positively held from rotary movement immediately after each feed of a certain length of yarn strand until a further feeding is permitted by means of the tensioning lever 5 releasing the pawl 6 from the teeth of the bobbin 1.

The yarn tensioning lever 5 has the opposite ends of its two arms 5a and 5b united by a tubular shaft 10 which is journaled in a bearing 11 on the base member 4, and its front end is formed with a hook-shaped yarn guide 13. The arm 51) is provided with an intermediate eccentric projection or cam surface 14, as shown in Fig. 2, arranged to coact with a projection or cam member 15 on the pawl 6 to cause the latter to rotate on its pivot 16, thereby disengaging the pawl tooth or detent 8 from contact with the bobbin teeth 9. This pawl action insures the proper feeding of a yarn in a taut condition and also pr vents slack or overfeeding of the yarn. The lever 5 is raised to the yarn releasing position, as shown in Figs. 1 and 2, by an increased tension of the yarn strand caused by the braiding of the yarn on an article of manufacture (not shown). The tension of the yarn strand is maintained substantially constant by a coil spring 18 mounted within the hollow shaft 10, the ends of which are respectively hooked through an aperture 19 in one of the lever arms 5a or 5b, and the other end hooked through an aperture 20 in an arm 21 of the pawl lever 6. The pawl lever is formed with a detent portion 8 at its end opposite to the cam portion 15. One end of the pivot 16 is secured at the mid-portion of the pawl lever 6; and the arm 21 is rigidly secured to the opposite end of the pivot. The body of the pivot is journaled in a bearing 11a provided at the upper part of the base 4. Thus a rocking motion is imparted to the pawl lever 6 during the similar but opposite directional movement of the lever 5.

A thread guide upright 24 is fixed to an extension 22 on the base 4 and has one or more suitable yarn guide eyes 25 and 26 thereon. The yarn strand 27 unwinds from the package 2 to pass through the guide eye 25, then extends downward and around the hook-guide 13 and upwardly through the eye 26 to the article of manufacture to which the yarn is fed during the braiding operation.

Fig. 2 illustrates the cam surface 14 on the lever arm 51) in the operation of causing the cam follower 15 to rise, thereby oscillating the pawl lever 6 and disengaging the detent 8 from the bobbin teeth 9. The bobbin 1 and the yarn package held thereon are now free to rotate and release a length of yarn. The lever 5 immediately responds to the decreased tension of the fed strand 27 by means of the common spring 18 which simultaneously forces the lever hook 13 downward and the detent 8 into engagement with a bobbin tooth 9.

Fig. 3 illustrates the positions occupied by the levers 5 and 6 when a yarn strand breaks. At the instant a thread becomes severed during op eration, the pawl 6, by means of the detent 8 and through the action of the spring 18, looks the bobbin against further rotation or further unwinding of additional yarn. The lever 5 is at such time in its lower extreme position so that the outwardly curved surface of the arm 5 will serve as an abutment to the usual braiding machine automatic stop motion lever.

Fig. 4 illustrates the biased relation of the lever 5 and the pawl 6 by means of the action of the common spring 18 and the opposed relation of the spring ends in the separate apertures 19 and 20. The cam surface 14 acts as an eccentric cam member for the lever 6, so that, as the yarn tension increases, the eccentric end 14 of the lever 5'cams the pawl lever 6 by means of the lat ters cam follower or offset member 15. The length of the lever 5 further aifords a certain regulation of the tension on the strand 27 and maintains the same at a desired minimum degree, due to the arcuate swing of the hook portion 13 which acts to alternately increase and decrease the leverage effect upon the spring 18 as the tension of the latter alternately increases and decreases during upward and downward travel of the cam. The yarn tension is thus equalized at difierent points in the swing of the arm and maintained substantially constant during the swinging components of the arm before and after it engages the pawl lever 6.

Fig. 5 illustrates a modified form of a carrier 30 having a pawl 31 with an ofiset 32 formed at right angles to the detent portion 34 for coaction with a plurality of pawl locking devices 33 pro-- vided in racks 35 on the upright 36, presently referred to in detail. The bifurcated cam lever 3'? has a contour similar to the lever 5 hereinbefore described; and a bobbin 38, with ratchet teeth 39, is provided for functioning in the same manner as described for the bobbin 1 of Fig. 1.

In the form shown in Fig. 5, the thread guide upright 36 is preferably cast integral with the base portion 41 and is in the form of a fiat strip with a yarn guide eye 42 at its upper end. The base 41 is formed with spaced plates 40, a shuttle piece 400: and pin 4022 similar to the'corresponding parts 3, 3a and 3b of the form shown in Fig. 1.

A plurality of yarn strands 43 and 44 unwind simultaneously from the package 45. They are then divided into the single strands 43 and 44 so that each strand will pass singly under the hooks 46 of the suspended weights 33, then through separate eyes 47 at the mid-portion of the upright and downwardly together around the hook guide 48 on the bifurcated thread tension lever 3'7. The two strands then pass upwardly through the uppermost eye 42 and are grouped with threads from a plurality of carriers which are jointly worked into the desired article of manufacture.

The locking means in this instance comprises a plurality of thread tension weight bodies 33 which are suspended from the individual strands 43 and 44 of the yarn feeding package during the yarn feeding operation. Upper and lower racks 35, 35a and 351) are formed on the inner surface of the upright 36 in such manner that,

as certain of. the strands become severed during a feeding operation, one of the weight members 33 will be guided intolocking engagement with the pawl lever 31, as shown in Figs. '7 and 9.

In Fig. 6, the automatic pawl locking members 33 are shown suspended from the individual yarn strands. The yarn package and upper portion of the bobbin are here broken away for clarity. The locking members 33 are in this instance formed with hook shaped upper ends having long stems 49 which overlap the intermediate rack member 35a in such manner that the members 33 are guided and supported against vibration in all lateral directions, as clearly seen in Fig. 11.

In Fig. 7, the yarn strands have been severed, thereby causing the pawl locking members 33 to be positioned between the pawl offset member 32 and the inner surface of the thread guide upright 36. The thread tensioning lever 37 is here shown in released position.

The operatic-n of the plural feed thread carrier shown in Figs. 5 to 9, inclusive, is as follows: When one of the yarn strands breaks during rotation of the carrier ina braiding machine, one

of the weights 33, which is suspended from the severed thread, will descend and remain in a lowered position, as shown in Fig. 7, and thus being wedged between the pawl offset 32 and the upright post 36, thereby locking the pawl 31 against swin ing on its axis or pivot 50 upon actuation by 4 break, and release the remaining weight 33. The

thread tension lever 37 will then be free from the yarn and will drop to its lowermost position as indicated in Fig. '7, because of the action of the spring 51 in the hollow shaft 52. The lever 37 will then'stop the braiding machine by engaging. and operating the stop-motion trip lever 53, as shown at 56 in Fig. 9.

The spring 51 functions in a manner similar to that of the spring 18 of Figs. 1 to 4. In this instance, however, the pawl lever 31 and the thread tension lever 37 are separately actuated by individual springs 51 and 55 mounted about the piv otal axis of each lever. As seen in Fig. 10, the spring 51 is positioned within the hollow shaft 52 of the thread tension lever 37. One end of the spring 51 is secured to a stationary pin 58, at a side of the shaft journal 59, and the other end is inserted in an aperture 60 onthe opposite arm of the tension lever 3'7, so that the lever 37 is ten-' sioned against the base member 41.

The pawl lever 31 is maintained in tension by the separate spring 55 on an extension of the pawl pivot 50 (see Figs. 8 and 9). One end of the spring 55 is stationed in a suitable aperture in the side of the pivot journal 55'. The other end, as seen at 61, is secured to a flange 62 provided on the pivot member 50 which latter is secured to the pawl lever 31 for simultaneous rocking motion therewith.

Obviously, the invention is not limited to levers of the particular forms here disclosed. Also, spring operated devices may be satisfactorily substituted for the gravity actuated members 33.

Each of the modifications of the invention described and shown herein includes a spring pressed yarn tensioning lever arm and a spring pressed pawl lever, in which the coil spring portions are compactly arranged and substantially enclosed about the hollow shaft or pivot portions,

the springs being thereby kept out of the way of the flying yarn, with less likelihood of being affected by collection of lint or entanglement with the threads. The tension of the springs may be readily altered when desired by simply increasing or decreasing the number of turns or coils before securing the ends in place in their respective apertures; and for fine adjustment purposes, a plurality of spaced apertures 19, 20, 55 or 60, may be provided to receive the respective spring ends in tension-altering relation.

Another advantage of the construction resides in the arrangement of the bifurcated lever arm and the oppositely acting, relatively short, awl lever, with their yarn engaging and tooth engaging portions disposed at the front of the yarn carrier, in compact order and their cam portions intermediate their respective pivoted mountings. This arrangement also aiiords a very efiicient and uniform leverage between the coacting cam portions of the arm and pawl, in which the pressure is applied evenly and gradually during the upstroke of the yarn tensioning lever arm without any jar or perceptible increase as the pawl is caused to release the toothed portion of the bobbin. The entire construction is simple and rugged and not likely to get out of order, and is easy to disassemble or reassemble whenever the same may be necessary.

Of course, the improvements specifically shown and described, by which we obtain the above results, can be changed and modified in various ways without departing from the scope of the invention herein disclosed and hereinafter claimed.

We claim:

1. In combination with a braiding carrier having a rotatable support for a yarn package; a rocking pawl and a lever for controlling the rotation of said package support and means operative to engage the pawl to lock the same against rocking on its axis independently of the lever, to prevent rotation of said package, when a yarn strand breaks.

2. In combination, a braiding carrier having a rotatable bobbin for supporting a yarn package comprised of a plurality of parallel wound strands; rocking levers cooperatively associated with said bobbin to control movement thereof and means responsive to breakage of any of the strands independently of another to lock one of said levers to prevent rotation of said bobbin.

3. In combination, a braiding carrier having a rotatable bobbin arranged to support a yarn package composed of a plurality of parallel wound strands, lever means cooperative with said bobbin to control the movement thereof, and locking means responsive to breakage of any of the strands independently of another to prevent coaction of said levers for locking said package against rotation.

4. In a braiding carrier, the combination of a base including a footpiece, a yarn carrying bobbin rotatably mounted on said base, said bobbin provided with a toothed portion, a yarn tensioning lever arm pivotally mounted on said base, a spring for tensioning said lever arm against upward movement, a pawl lever pivotally mounted on said base above said lever arm, said pawl lever including a locking portion engageable with the toothed portion of said bobbin, and said lever-arm and pawl-lever including cooperatively engageable portions between the pivot point and the free end of the yarn-tensioning lever whereby upward tensioning movement of said arm swings said pawl away from said toothed portion to permit rotation of said bobbin, and means dependent on yarn breakage for locking said pawl lever in its bobbin-rotation-preventing position.

5. In a braiding carrier, the combination of a base including a foot piece, a plural thread yarncarrying bobbin rotatably mounted on said base, said bobbin provided with a toothed portion, a thread guide uprising from said base, said yarn extending through said guide, a spring pressed yarn tensioning lever arm and a spring pressed pawl lever, both pivotally mounted on said base, said pawl lever being arranged to engage the toothed portion of said bobbin, and said leverarm and pawl-lever including cooperatively engageable portions whereby tensioning movement of said arm swings said pawl away from said.

toothed portion to permit rotation of said bobbin,

and means coactive with said yarn whereby yarn breakage causes said means to lock said pawl lever in its bobbin rotation preventing position.

6. In a braiding carrier, the combination of a base including a footpiece, a plural thread yarncarrying bobbin rotatably mounted on said base, said bobbin provided with a toothed portion, a

thread guide uprising from said base, said yarn bodies arranged for suspension by the threads of said yarn, and, upon breakage of said yarn, to fall to a position between said pawl lever and thread guide.

7. A carrier, for feeding a plurality of yarns in a braiding machine, comprising a base, package-supporting means rotatably mounted on the base, means on the base for controlling movement of said supporting means, and means responsive to breakage of one of said yarns irrespective of breakage of another of said yarns and including an element for actuating a machine control member. r

8. A braiding carrier comprising a rotatable yarn-package support, means including a pawl and a lever for controlling the rotation of the support, and means including an element responsive to breakage of the yarn for locking the pawl against movement independently of the lever.

59. A braiding carrier comprising a rotatable bobbin for supporting a parallel-strand package, means including a lever for controlling movement of the bobbin, and means responsive to breakage of one of the strands independently of another for preventing operation of the lever and locking the bobbin.

10. A braiding carrier comprising a base, a bobbin rotatably mounted on the base and having teeth, a yarn-tensioning arm pivotally mounted on the base, a spring for tensioning the arm against upward movement, a pawl mounted on the base above the arm for locking cooperation with the teeth and cooperation with the arm between the pivot point and the free end of the arm for movingthe pawl to unlock the teeth in response to upward tensioning movement of the arm, and means responsive to yarn breakage for locking the. pawl in its tooth-locking position.

- MAX KRISSIEP.

HERMAN STAUB.

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