US3921921A

US3921921A - Winding mechanism for making yarn packages of a cylindrical form in a textile machine

Info

Publication number: US3921921A
Application number: US443958A
Authority: US
Inventors: Shigeo Katayama; Katsunori Sato; Tomoyuki Miyagawa; Hisateru Takahashi; Takashi Kato; Toshio Yoshizawa; Yasuo Yamada
Original assignee: Daiwa Boseki KK
Current assignee: Daiwa Boseki KK
Priority date: 1973-02-24
Filing date: 1974-02-20
Publication date: 1975-11-25
Anticipated expiration: 1992-11-25
Also published as: CH576907A5; DE2408382A1; DE2408382B2; GB1464112A; CS181742B2

Abstract

An improved winding mechanism is provided for making yarn packages of a cylindrical form in a textile machine in which a cradle for turnably holding a bobbin comprises a pair of cradle arms, each cradle arm is provided with a bobbin holder rotatably mounted thereon in facing condition to a bobbin holder of another cradle arm, one of the bobbin holders is provided with at least one catching member for catching a portion of yarn continuously delivered from a yarn delivering mechanism of said machine. Means for cutting yarn ends is disposed to a cradle arm at a position adjacent to the bobbin holder provided with the catching member.

Description

United States Patent Katayama et al.

WINDING MECHANISM FOR MAKING YARN PACKAGES OF A CYLINDRICAL FORM IN A TEXTILE MACHINE Inventors: Shigeo Katayama; Katsunori Sato;

Tomoyuki Miyagawa; Hisateru Takahashi, all of Fukui; Takashi Kato, Kariya; Toshio Yoshizawa, Chiryu; Yasuo Yamada, Kariya, all of Japan Assignees: Daiwa Boseki Kabushiki Kaisha,

Osaka; Kabushiki Kaisha Toyoda Jidoshokki Seisakusho, both of Japan Filed: Feb. 20, 1974 Appl. No.: 443,958

U.S. Cl. 242/18 DD; 242/18 PW Int. Cl. B6511 54/10; B65I-I 65/00 Field of Search 242/18 DD, 18 PW, 18 A References Cited UNITED STATES PATENTS 12/1964 Balash 242/18 PW 3,198,445 8/1965 Hull, Jr. et a1 242/18 PW 3,275,252 9/1966 Bolger 242/18 PW 3,411,726 11/1968 Engleman et al. 242/18 PW 3,532,278 10/1970 Sparling 242/18 A 3,690,575 9/1972 Ito et al. 2.42/18 A 3,801,030 4/1974 Kobatake et al 242/18 PW X FOREIGN PATENTS OR APPLICATIONS 1,104,156 2/1968 United Kingdom 242/18 A Primary Examiner,Stanley N. Gilreath Attorney, Agent, or FirmBurgess Ryan and Wayne [57] ABSTRACT An improved winding mechanism is provided for making yarn packages of a cylindrical form in a textile machine in which a cradle for turnably holding a bobbin comprises a pair of cradle arms, each cradle arm is provided with a bobbin holder rotatably mounted thereon in facing condition to a bobbin holder of another cradle arm, one of the bobbin holders is provided with at least one catching member for catching a portion of yarn continuously delivered from a yarn delivering mechanism of said machine. Means for cutting yarn ends is disposed to a cradle arm at a position adjacent to the bobbin holder provided with the catching member.

6 Claims, 16 Drawing Figures U.S. Patent Nov. 25, 1975 Sheetl0f8 3,921,921

Fig. Fig. 2 Pfl/OR A PH/Of? ART I F THTHE 4 1U ULLLL! U.S.-Patent Nov. 25, 1975 Sheet2of8 3,921,921

U.S. Patent Nov. 25, 1975 Sheet3of8 3,921,921

US. Patent Nov.2 5, 1975 Sheet4of8 3,921,921

US. Patent Nov. 25, 1975 Sheet5of8 3,921,921

US. Patent Nov. 25, 1975 Sheet6of8 3,921,921

F ig. /2

Fig.

US. Patent Nov. 25, 1975 Sheet70f8 3,921,921

US. Patent Nov. 25, 1975 Sheet80f8 3,921,921

WINDING MECHANISM FOR MAKING YARN PACKAGES OF A CYLINDRICAL FORM IN A TEXTILE MACHINE SUMMARY OF THE INVENTION The present invention relates to an improved winding mechanism for making yarn packages of a cylindrical form in a textile machine such as an open-end spinning frame.

In the conventional winding mechanism for making yarn packages of a cylindrical form in a textile machine, for example, in an open-end spinning frame, the

operation for doffing yarn packages of full size from the respective winding mechanisms has been carried out without stopping the spinning operation. That is, in the doffing operation, the yarn, which is continuously being delivered from the spinning unit, is first cut between a take-up means and the winding mechanism, then the cut end of the yarn which is continuously being delivered from the take-up means in introduced into a suction nozzle disposed adjacent to the winding mechanism and a full packaged yarn cylinder is doffed from a cradle of the winding mechanism following this, a fresh bobbin is mounted on the cradle in rotatable condition. Next, the yarn, which is continuously being sucked into the suction nozzle, is separated from the nozzle by cutting it, and a loop is manually formed in the free end portion of the yarn, which is continuously being delivered from the take-up means. The loop is then wound on the fresh bobbin rotatably held by the cradle while the end of the free end portion of the yarn is still held manually. When the above-mentioned loop is wound on the fresh bobbin, it is introduced into a gap between the fresh bobbin and a driving drum, which is usually a split drum, for driving the fresh bobbin at the time of commencing the winding operation, and for driving a yarn package until a full packaged yarn package is produced. The cradle is then turned so as to place the fresh bobbin into contact with the driving drum. After the above-mentioned operation, the end of the free end portion of the yarn held manually is cut so that a cut end portion of the yarn, which is connected to the yarn being delivered from the take-up roller, is also wound on the bobbin. Consequently, during the above-mentioned doffing and donning operation, it is required to cut the yarn two or three times. However, in the conventional open-end spinning frame, the delivery speed of the yarn from the take-up means is sufficiently low and the yarn produced by the open-end spinning frame is sufficiently weak as to make impossible the above-mentioned cutting operation of the yarn by hand.

unit has been remarkedly increased and, further, the latest tendency is to produce so-called blended yarns mixed with a synthetic fiber or yarns having greater thickness, so that the breaking strength of these yarns is increased, and they are too strong to cut by hand.

Due to the increase in the delivery speed of yarn from the take-up roller of a spinning unit and the increase of the breaking strength of the yarn, the above-mentioned manual cutting operation during the doffing operation has become very difficult. Further, if the cutting operation is carried out by hand, the free end portion of the cut yarn which is wound on a fresh bobbin is entangled with a yarn portion which was initially wound on a fresh bobbin. If the above-mentioned entangled portion of the yarn is created, in the successive process, this entangled portion disturbs the smooth unwinding operation of the yarn portion initially wound on a fresh bobbin.

The principal object of the present invention is to eliminate the above-mentioned undersirable results during the winding operation in the successive process such as supplying yarn in a knitting process or warping process of rewinding process.

A further object of the present invention is to produce cylindrical yarn packages wherein an initial portion of yarn is wound on an end portion ofa bobbin as a tail end yarn portion so that, when unwinding of the yarn package is required, the tail end yarn portion of a processing yarn package can be easily connected to a tip end portion of a fresh yarn package.

To attain the above-mentioned object, in the apparatus according to the present invention, a cradle for turnably supporting a bobbin, whereon a yarn package is formed, is provided with an improved mechanism comprising means for catching a portion of yarn continuously being delivered from a take-up means and means for cutting a yarn which is continuously being sucked into a suction nozzle during the doffing operation. Further, to attain a stable and smooth yarn catching and cutting operation, means for guiding a yarn portion delivered from the take-up means is additionally provided.

Further features and advantages of the improved winding mechanism according to the present invention are hereinafter illustrated in detail with reference to the attached drawings.

BRIEF EXPLANATION OF THE DRAWINGS FIG. I is a perspective view of a conventional winding mechanism of the open-end spinning frame",

FIG. 2 is an elevational view of the main part of the winding mechanism shown in FIG. 1;

FIG. 3 is an explanatory perspective view of a part of a driving drum when a free end portion of the yarn delivered from the take-up means is introduced to a nip between the fresh bobbin turnably supported by the cradle and the driving split drum, when the operation is carried out manually;

FIG. 4 is a perspective view of the main part of the winding mechanism according to the present invention;

FIG. 5 is an elevational view of the main part of another winding mechanism according to the present invention;

FIGS. 6 and 7 are schematic side views of the mechanism shown in FIG. 4;

FIG. 8 is an elevational view of the main part of a modified embodiment of the winding mechanism shown in FIG. 5;

FIG. 9 is a schematic side view of a cradle arm of the winding mechanism shown in FIG. 5;

FIG. 10 is a schematic side view of a modified cradle arm of the winding mechanism shown in FIG. 5;

FIGS. 11, 12, 13, 14, 15 and 16 are schematic side views of the improved cradle showing the relative disposition of the main elements of the improved winding mechanism shown in FIG. 4.

DETAILED ILLUSTRATION OF THE PRESENT INVENTION For the sake of easy understanding of the present invention, the conventional winding mechanism is first 3 illustrated and then the embodiments according to the present invention are illustrated in detail.

Referring to FIGS. 1, 2 and 3, in the conventional unit of the open-end spinning apparatus, when a fresh bobbin 1 is rotatably mounted on a cradle 2, comprising a pair of

arms

2a and 2b, and it is necessary towind a yarn 3, which is continuously delivered from an openend spinning unit 4, on the fresh bobbin 1, the yarn 3 is first introduced to the bobbin 1 by way ofa take-up roller 5 and a top roller 6, a compensator 7, a split drum 8, by a hand 9. To allow the bobbin 1 to catch the yarn 3, a portion of the yarn 3 is slackened for an instant so as to form a loop at the nip line between the bobbin 1 and the split drum 8 while holding a free portion of the yarn 3 so that the loop is caught by the fresh bobbin 1. When the transverse motion of the yarn 3 along the axis of the bobbin 1 is commenced by the split drum 8, the free end portion of the yarn 3 caught by hand 9 is cut manually. According to the above-mentioned operation, the cut end portion 3a connected to the loop is wound on the bobbin 1 in an entangled condition with yarn would on the bobbin 1 which forms the lowermost layer of the yarn package, as shown in FIG. 2. As already pointed out, the above-mentioned entangled yarn portion 3a creates a resistance to smooth unwinding of the lowermost layer of yarn and, consequently, the yarn is often broken at the terminal period of the winding operation of the yarn packages.

According to the present invention, the creation of the above-mentioned entanglement of the tip end portion of a supply yarn with the lowermost layer of yarn wound on a bobbin is prevented by adopting an auxiliary means for positively catching the tip end portion of the supply yarn 3 on an end portion of a fresh bobbin 1 rotatably mounted on the cradle 2. Further, an additional means such as a cutter to cut an excess portion of the yarn 3 which is gripped by hand 9 is utilized to carry out the operation without failure even though the delivery speed of the yarn 3 from the unit 4 of the open-end spinning apparatus is very high. The improvement of the winding mechanism of the open-end spinning apparatus which is a typical embodiment of the present invention is hereinafter illustrated in detail with reference to FIG. 4, wherein the elements having similar function to the elements shown in FIGS. I and 2 are represented by the same reference numerals as the elements shown in FIGS. 1 and 2. In the improved winding device shown in FIG. 4, each cradle arm or 2b is provided with a bobbin holder 13 which is turnably mounted thereon in such a way that the holder 13 of each cradle arm 20, 21) faces the holder 13 on the other cradle arm so as to hold a fresh bobbin 1 therebetween and the holder 13 of the cradle arm 20 is provided with at least one hook member 14 which is capable of picking up a yarn 3 when the yarn 3 is turned over the fresh bobbin 1 as shown in the drawing of FIG. 4. A guide rod 11 is turnably mounted on a supporting member 10, secured to a machine frame, by a pin mechanism 12 in such a manner that after the doffmg operation and when a yarn end portion is introduced to the fresh bobbin 1 turnably mounted on the cradle 2, the guide rod 11 is turned to a position which is perpendicular to the supporting member 10 and is represented by a solid line in the drawing from a position represented by a dot-dash line in FIG. 4. The position of the pin mecha nism 12 is fixed at a position in the same vertical plane as the end ofthe bobbin 1 at the side of the cradle arm 2a. The pin mechanism 12 is provided with a holding 4 means such as a spring member which holds the guide rod 11 at the positions represented by the solid line or dot-dash line alternatively in such a conditionthat the guide rod 11 can be turned about the pin mechanism 12, manually. The pin mechanism 12 is provided with a spring means (not shown) by which the holding position of the guide rod 11 can be maintained eventhough a yarn tension pulls against it. The operation of the,

winding mechanism shown in FIG. 4 can be illustrated as follows. When it is required to catch an end portion of the yarn 3 on the bobbin 1, first the guide rod 11 is turned to a projecting position which is shown by the solid line, from a position represented by the dot-dash lin in FIG. 4, so that the passage of the yarn 3 is dis-.

placed toward the side of the cradle arm 2a. Thereaf- I ter, the yarn 3 is turned over the bobbin 1 as shown in FIG. 4. When the cradle 2 is turned towards the split drum 8 and the bobbin 1 is placed into contact with the I split drum 8, the bobbin 1 is rotated and one. of the hook members 14 catches a free end portion of the yarn 3 so that winding of the yarn 3 about the bobbin 1 is commenced. If the yarn end portion is .cut while being caught by the hook member 14 of the holder 13, the cut end portion of the yarn 3 is wound on the end portion of the bobbin 1. When a sufficient length of yarn as a tail end portion has been woundon and end portion of the bobbin 1 on the side of the cradle arm 20, the guide rod 11 is turned to its waiting position represented by the dot-dash line in FIG. 4. According to the above-mentioned turning motion of the guide rod 11, the yarn 3 is caught by a guide split of the split nected to a tip end of the fresh yarn package and the rewinding operation of the successive yarn packages can be continuously carried out. Further, as the tail end portion of the yarn package produced by the abovementioned device is not entangled with the first yarn layer wound on the bobbin 1, resistance from such entanglements which disturbs in the free unwinding of the yarn package can be perfectly prevented so that yarn breakage due to the above-mentioned resistance is perfectly eliminated.

In the embodiment of the improved cradle according to the present invention which is shown in FIGS. 5, 6 and 7 a connecting member 20 holds the cradle arm 2a and an auxiliary arm 16 rigidly. The cradle arm 2b is turnably mounted on the auxiliary arm 16 by a pin 18, and an extended portion 17 of the arm 2b is always pushed away from the arm 2a by a spring 19 mounted on a base member 15 which is provided with a pair of arms 15a, 15b. The

arms

2b and 16 are secured to the connecting member 20 in such a way that the arms 2b. and 16 are capable of turning about a pivot shaft together with the connecting member 20. Consequently, the arm 2b is capable of being turned manually about the pivot shaft 150 as well as about the pin 18 V toward directions represented by A.

The cradle arm 2:: is provided with a holder 13a at a.

free end portion thereof, while the cradle arm 2b is also provided with a holder 13b at a position facing the.

holder 13a as shown in FIG. 5. Each holder 13a and 13b is provided with stepwise disc portions, for example, the holder 13a comprises a base disc portion 130 turnably mounted on the cradle arm 2a and an additional disc portion 13d coaxially projecting from the base disc portion 130 and which has an identical diameter to a diameter of a bore of a bobbin 1. The base disc portion 130 is provided with a plurality of small cut-out portions 21 formed on the peripheral surface thereof. The holder 13b is provided with a construction similar to that of the holder 13a except that holder 13b does not have the cut-out portions 21. Therefore, when it is required to doff a yarn package from the cradle 2, the cradle 2 is first turned about the pivot shaft 150 in a direction which moves it away from the drum 8, then the cradle arm 2b is turned about the pin 18 in a direction which moves it away from the cradle arm 2a. When it is required to mount a fresh bobbin on the cradle 2, one end of the bore of bobbin 1 is mounted on the additional disc portion 13d while holding the bobbin 1, and then the additional disc portion of the holder 13b is inserted into the other end of the bore of the bobbin 1 by turning the cradle arm 2b toward the cradle arm 2a. As the cradle arm 2b is always urged toward the cradle arm 2a by the spring 19, the fresh bobbin 1 is stably held by the cradle 2 in a turnable condition as shown in FIG. 5. The cradle arm 2a is provided with a small cutout portion 22 at a position adjacent to the holder 13a. A cutter 23 is disposed in the cradle arm at a position adjacently below the cut-out portion 22 as shown in FIG. 6. As shown in FIGS. 5, 6 and 7, the cutter 23 is mounted at a position recessed from the outer surface of the cradle arm 2a. The doffmg and donning operation can therefore be safely operated without any possibility of injuring the hand of the operator. The detailed construction of the cut-out

portions

21 and 22, and the cutter 23 is shown in FIGS. 9 and 10. That is, in FIG. 9, the holder 13a is turnably mounted on the cradle arm 20 by a bearing assembly 13e and the cutter 23 is held in the cradle arm 2a by a fastener 26. In a modified embodiment shown in FIG. 10, an edge of the additional portion 13c extends outwardly, and the cutout portions are formed in this extending portion.

In the donning operation for mounting a fresh bobbin on the cradle 2 and winding a free end of a yarn 3 on the bobbin 1, a free end portion of the yarn 3 is hung over the bobbin 1 and manually introduced toward the cradle arm 2a in such a way that the yarn 3 is introduced into the cut-out portion 22 of the cradle arm 20. In this condition, the yarn 3 is caught by one of cut-out portions 21 and the free end portion of the yarn 3 is cut by the cutter 23 when the cut-out portion 21 by which the yarn 3 is caught, passes through a position facing the cut-out portion 22 of the cradle arm 2a as shown in FIG. 7. After the yarn 3 is wound on an end portion of the bobbin 1, the yarn 3 is displaced to a normal winding position where the yarn 3 is caught by a guide groove of the drum 8 so as to commence the normal winding operation.

To wind a transfer tail of the yarn 3 on a fresh bobbin 1 in a preferable condition for handing a yarn package in the successive unwinding process, a guide member 24, as seen in FIG. 8, such as the guide rod 11 utilized in the embodiment shown in FIG. 4 may be applied to the winding unit shown in FIG. 5.

That is, after the guide rod 24 displaces the yarn toward the cradle arm 2a, the yarn 3 is caught by the cut-out portion 21 of the holder 13a while a free end of 6 the yarn 3 is introduced into the cut-out portion 22 of the cradle arm 20. Therefore, a transfer tail portion of a yarn package can be formed at an end portion of the bobbin 1 before carrying out the normal winding operation which is commenced after the guide rod 24 is displaced to its waiting position.

In the above-mentioned embodiments, shown in FIGS. 4, 5 and 6, the catch member such as the hook member 14 or the cut-out portion 21 is utilized to catch a portion of the yarn 3. However, modifications of the catch member can be made in the present invention.

Now the donning operation of the fresh bobbin 1 on the cradle 2 shown in FIG. 8 is hereinafter illustrated in detail. Referring to FIGS. 11, 12, 13, 14, 15 and 16, when a yarn package la of full size is produced as shown in FIG. 11, the yarn 3 being continuously delivered from the pair of

rollers

5 and 6 is manually intro-' duced into a suction means 27 after cutting the yarn 3 as shown in FIG. 12. A cutter 28 may be utilized for cutting the yarn 3.

Next the yarn package 10 is displaced to a conveyor 30 via a guide plate 29 mounted on each spinning unit. The conveyor 30 is disposed along a longitudinal direction of the spinning frame at a position adjacent to the spinning units 4. During the above-mentioned operation, the yarn 3 is continuously sucked into the suction means 27, and the cradle 2 is turned about the pivot shaft 15c so as to move it away from the drum 8, as shown in FIG. 13. Next, a fresh bobbin 1 is mounted on the cradle 2 in such a manner that the yarn 3 runs under and then over the bobbin 1 while the yarn 3 is continuously sucked into the suction means 27. This condition is shown in FIG. 14. Next, the cradle 2 is turned about the pivot shaft toward the drum 8 so as to place the bobbin 1 into contact with the drum 8, as shown in FIG. 15. In this condition, the yarn 3 between the bobbin 1 and the suction means 27 is displaced toward the cradle arm 20 so as to introduce the yarn into the cut-out portion 22 of the Cradle 2:: (see FIG. 5), so as to catch the yarn 3 by one of cut-out portions 21 of the holder 13a.

As the bobbin 1 is turned together with the holder 13a, the yarn is cut by the cutter 23 automatically when the cut-out portion 21, by which the yarn 3 is caught, passes a position facing the cutter 23, and the winding of the yarn 3 on the bobbin 1 is commenced. As already mentioned in the embodiment shown in FIG. 8, the guide rod 24 is utilized in winding a transfer tail end of the yarn 3 on an end portion of the bobbin 1. When the above-mentioned donning operation is completed, the yarn guide 24 is displaced to its waiting position, so that a normal winding operation of the yarn 3 on the bobbin 1 is commenced.

In the above-mentioned explanation of the donning operation, a sliver 31 is supplied from a can 32 into the spinning unit 4.

As mentioned above, the yarn package 10 produced by the winding mechanism according to the present invention is provided with a transfer tail end portion wound on an end portion of the bobbin 1 without entanglement of the innermost layer of yarn so that, when the rewinding operation carried out in a successive process, yarn breakage due to the entanglement of the tail end of yarn 3 can be perfectly prevented. Further, if it is required to connect the transfer tail end of an exhausted yarn package with a tip end portion of a fresh yarn package, it can be easily carried out.

What is claimed is:

1. In a winding mechanism of a textile machine provided with a yarn delivery means, a cradle for turnably holding a bobbin wherein a yarn package is formed by a yarn delivered from said yarn delivery means, a driving drum for turning said bobbin and an instant yarn package formed on said bobbin by frictional contact, said cradle comprising a pair of cradle arms connected by a connecting member turnably mounted on a pivot shaft rigidly mounted on a frame of said winding mechanism, the improvement comprising a pair of opposed bobbin holders turnably mounted on said cradle arms, each bobbin holder being provided with a base disc portion and an additional disc portion projecting coaxially from said base disc portion, said additional disc portion having a diameter identical to the diameter of the bore of said bobbin and smaller than the diameter of said base disc portion one of said bobbin holders being provided with at least one catching member positioned on a peripheral surface of said base disc portion thereof, a cut-out portion formed on said cradle arm at a position adjacent to said bobbin holder provided with said catching member, a cutter disposed on said cradle arm at a position adjacent to said cut-out portion,

whereby when a donning operation is carried out, a portion of a yarn being continuously delivered from said delivery means is caught by said catching member, and a yarn connected to a doffed yarn package is cut by said cutter so that a tail end portion of yarn is formed and said tail end portion of yarn is wound on an end 8 I portion of said bobbin without being entangled with an innermost layer of yarn formed on said bobbin;

2. A winding mechanism according to claim 1, further comprising a suction means disposed above said cradle.

3. A winding mechanism according to claim 1, further comprising a movable guide rod fordisplacing a yarn toward a cradle arm provided with a bobbin 7 holder having said catching member 4. A winding mechanism according to claim 1, wherein said catching member is a cut-out, portion formed on a base disc portion of said bobbin holder.

5. A winding mechanism according to claim 1 comprising guide means for reciprocating said yarn parallel to the axis of rotation of said bobbin whereby the yarn i is evenly wound in layers on said bobbin, and auxiliary guide means for lifting said yarn from said guide means I and for displacing said yarn to said catching member.

6. A winding mechanism according to claim 5,

wherein said guide means comprises a guide rod rotatbobbin rotational axis and spaced from said yarn'to a a position substantially normal to said bobbin rotational UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Pa Dated November 25, 1975 I t Shigeo Katayama et a1.

It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

column 7, line 27: After "yarn" :first pccurrence, add previouslyafter "package" add -and separated from a delivered yarn Signed and Sealed this A ttest:

RUTH C. MASON C. MARSHALL DANN Arresting Officer Commissioner oj'larenrs and Trademarks

Claims

1. In a winding mechanism of a textile machine provided with a yarn delivery means, a cradle for turnably holding a bobbin wherein a yarn package is formed by a yarn delivered from said yarn delivery means, a driving drum for turning said bobbin and an instant yarn package formed on said bobbin by frictional contact, said cradle comprising a pair of cradle arms connected by a connecting member turnably mounted on a pivot shaft rigidly mounted on a frame of said winding mechanism, the improvement comprising a pair of opposed bobbin holders turnably mounted on said cradle arms, each bobbin holder being provided with a base disc portion and an additional disc portion projecting coaxially from said base disc portion, said additional disc portion having a diameter identical to the diameter of the bore of said bobbin and smaller than the diameter of said base disc portion, one of said bobbin holders being provided with at least one catching member positioned on a peripheral surface of said base disc portion thereof, a cut-out portion formed on said cradle arm at a pOsition adjacent to said bobbin holder provided with said catching member, a cutter disposed on said cradle arm at a position adjacent to said cut-out portion, whereby when a donning operation is carried out, a portion of a yarn being continuously delivered from said delivery means is caught by said catching member, and a yarn connected to a doffed yarn package is cut by said cutter so that a tail end portion of yarn is formed and said tail end portion of yarn is wound on an end portion of said bobbin without being entangled with an innermost layer of yarn formed on said bobbin.

3. A winding mechanism according to claim 1, further comprising a movable guide rod for displacing a yarn toward a cradle arm provided with a bobbin holder having said catching member.

4. A winding mechanism according to claim 1, wherein said catching member is a cut-out portion formed on a base disc portion of said bobbin holder.

5. A winding mechanism according to claim 1 comprising guide means for reciprocating said yarn parallel to the axis of rotation of said bobbin whereby the yarn is evenly wound in layers on said bobbin, and auxiliary guide means for lifting said yarn from said guide means and for displacing said yarn to said catching member.

6. A winding mechanism according to claim 5, wherein said guide means comprises a guide rod rotatable about an axis that is substantially perpendicular to the bobbin rotational axis and passes through a position proximate the catching member, said guide rod being rotatable from a position substantially aligned with said bobbin rotational axis and spaced from said yarn to a position substantially normal to said bobbin rotational axis and engaging said yarn.