Patent Publication Number: US-3876166-A

Title: Method and apparatus for controlling the traverse members of a winder

Description:
United States Patent Kadokura et al. 1 Apr. 8, 1975 {5 METHOD AND APPARATUS FOR 3.406.918 /1968 R-ttmckem. 242/263 CONTROLLING THE TRAVERSE 3.429.515 2/1969 Ramcke 242/263 314445.073 5/1969 Schippers et al. 242/263 MEMBERS OF A WINDER 3.445.999 5/1969 De Ruig U 242/263 X [75] lnventors: Sadao Kadokura; Takashi Kishida. 1477.654 11/1969 Tonnies .r 242/26 both of Mihara, Japan 3768.244 10/1973 Yasutomi et al 242/261 [73] Asslgnecl Teum Llmned Osaka Japan Fri/Mar E.\wn/nerStanley N. Gilreath [22] Filed: Sept. 11, 1972 Attorney. Agent. or Firm-Wenderoth, Lind &amp; Ponack [21] Appl. No.: 288,078  
  [57] ABSTRACT [30] Foreign Application Priority Data A means and apparatus for digitally controlling the re- Sept 16, 197] Japan .r 46-72069 ciprocating motion of a yarn traverse guide using pulse signals for the purpose of winding the filaments i552 jg zg on bobbins to a definite form is disclosed. A pulse sigp nal is generated in proportion to the distance of the {52] U5. CL 242/1582. 242/261. 242/26 movement of the traverse guide, said pulse signal starting to be Counted as said traverse guide passes the [511 ML Cl H Bh 54/3&#39;2 reference position near the center of the bobbin, di- [58] Field 0fSarCh.....1..&#39;ir.. 242/1582 158 158.4 of movemen of the &#34;averse guide being 242/26. 262 263 264 571/99 reversed as the number of pulses counted reaches the i 1 setpoint value, and the traverse guide being controlled [56} References Cited to gradually shorten its stroke as said setpoint value is UNITED STATES PATENTS decreased sequentially. 3,325.985 6/1967 Bucher 242/263 x 48 Claims 12 Drawing Figures 3397529 8/1968 Wolf 1 242/263 X 1 I .154 15\ ,2 1 g g k 7 1&#34; 4 r P a 1 1| E 1 5 r .4 l 13 a 2 l2 2 1 II fiv I 6 1 Z 5 6b 8b 2 --Ee-- I l 13(111/ 5 PATENTEDAPR 81975 SHEET DlUF 10 Ill kBTaTZLlESG PATENTEUAPR 81975 SHEET Fig. 2  
 t a I L- PATENTEDA 8W5 3.676.166  
 SHEET U30F 10 Fig.3  
 SI bu PATENTEB 1975 SHEET DSOF 1O PATENTEU 8|975 3,876,166  
 SHEET 070F 10 PATENTEU 8l975 3875,1663  
 SHEET GBGF 10 sd Pd 9 b Sd Pd Fig. b O  
 PATENTEU APR 81975 SHEET 1B3? 10 Fig. /2  
  +6 n Q..- MD. i im- .l U T t. U M. H mg i A WW II&#39;WI 1| lfzhvlll o I?! F O N W .0 Q MW n aw o b w SIWON METHOD AND APPARATUS FOR CONTROLLING THE TRAVERSE MEMBERS OF A WINDER BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a method and apparatus for controlling traverse devices used for winding filaments, especially used for winders for winding synthetic filaments on bobbins.  
 2. Description of the Prior Art in order to form stable filament layers on bobbin yarn traverse guides or bobbin support members, it is re quired to perform the reciprocating motion by gradually decreasing the length. i.e.. in parallel winding manner.  
  Traverse members heretofore in use. such as yarn traverse guides and bobbin support members have been installed on a traverse rod or traverse belt driven by a hydraulic cylinder or motor. and the control of stroke has been performed by a pattern plate. Movement of the pattern plate which moves together with the traverse member is detected by means of a photo-electric system: interruption of light rays by the pattern plate causes the electromagnetic valve or relay to operate so that the moving direction of the traverse member is reversed. while slow movement of the pattern plate perpendicular to the traverse direction controls the traverse member so that the range of stroke gets gradually shorter (see U.S. Pat. No. l.077.65l  
  However. the modern trend toward higher winding speeds has resulted in increased centrifugal force which acts to the filament layer. presenting the possibility of slough off. To prevent this it became necessary to accurately control the form of package. i.e.. to control the traverse member more accurately. Also where a multispindle spindrawing machine is used. it is desirable to control the traverse mechanism independently for each or for definite numbers of spindles for reducing the required manpower for replacing bobbins as well as for reducing the amount of waste threads produced. The conventional control devices. however. necessitate a mechanical setup such as a bulky pattern plate which is not suited for independent attachment to individual spindles.  
 SUMMARY OF THE INVENTION This invention has succeeded in providing a method and apparatus for controlling the traverse members of the winder eliminating the abovementioned drawbacks.  
  It is an object of this invention to provide a method and apparatus for controlling the traverse members which is capable of forming accurately the package of filament layers to a desired form.  
  it is another object of this invention to provide a method and apparatus for digitally controlling the stroke of traverse members using a pulse signal gener ated in proportion to the distance of the movement of the traverse member. without using a pattern plate.  
  It is a further object of this invention to provide a small and precision control device.  
  It is yet another object of this invention to provide a control device which allows the setting of accurate winding time.  
  According to this invention. there is provided a method comprising, producing storke pulses everytime the traverse member moves a predetermined distance. counting the number of said pulses from the time at which said traverse member has passed a reference position. reversing said traverse member when the number of pulses counted has reached a setpoint value. and reducing said setpoint values sequentially so that the stroke of said traverse member is reduced gradually. maintaining a reciprocating motion in parallel winding.  
  According to this invention, there is provided a control apparatus comprising. a means for producing stroke pulses everytime the traverse member moves a predetermined distance. a means for producing a reference position signal when said traverse member has passed a predetermined reference position. a first counter circuit which starts to count said stroke pulses from the time at which said reference position signal is produced thereby increasing the counted values one by one. a second counter circuit which counts the reversing of said traverse member and reduces the counted values one by one. a coincidence descriminating circuit which produces a coincidence signal when the counted values of said first and second counter circuits coincide with each other, and a circuit which upon receipt of said coincidence signal causes said traverse member to be reversed. thereby the stroke of said traverse member is shortened by a definite length for every reversed.  
  According to this invention. there is provided a control apparatus comprising. a means for producing stroke pulses everytime the traverse member moves a predetermined distance. a means for producing a reference position signal when said traverse member has passed a predetermined reference position. a first counter circuit which starts to count said stroke pulse from the time at which said reference position signal is produced and increases the counted values one by one. a circuit which produces a control signal when the counted value of said first counter circuit reached a setpoint value. a circuit which upon receipt of said control signal causes said traverse member to be reversed. a second counter circuit which counts the reversing of said traverse member to increase the counted values one by one. and a coincidence descriminating circuit which produces a coincidence signal when the counted values of said first and second counter circuits coincide. thereby when said coincidence signal is produced. said first counter circuit stops the counting of said stroke pulse. thereby reducing the stroke of said traverse member by a definite length for every reversed.  
  According to this invention. there is provided a control apparatus comprising. a means for producing stroke pulses everytime the traverse member moves a predetermined distance. a means for producing a reference position signal when said traverse member has passed a predetermined reference position. a first counter circuit which starts to count said stroke pulse from the time at which said reference position signal is produced and increases the counted values one by one. a pulse generating circuit for producing clock pulses. a second counter circuit which counts said clock pulse and reduces one by one the counted values which has been preset. a coincidence descriminating circuit which produces a coincidence signal when the counted values of said first and second counter circuits coincide with each other. and a circuit which upon receipt of said coincidence signal causes said traverse member to be reversed. so that the stroke of said traverse member is shortened by a definite length for every production of said clock pulse.  
  According to this invention. there is provided a control apparatus comprising. a means for producing a stroke pulses everytime the traverse member moves a predetermined distance. a means for producing a reference position signal when said traverse member has passed a predetermined reference position. a first counter circuit which starts to count said stroke pulse from the time at which said reference position signal is produced and increases the counted values one by one. a circuit which produces a control signal when the counted value of said first counter circuit has reached a setpoint value. a circuit which upon receipt of said control signal causes said traverse member to be reversed. a pulse generating circuit for producing clock pulses. a second counter circuit which counts said clock pulse and increases the counted values one by one. and a coincidence descriminating circuit which produces a coincidence signal when the counted values of said first and second counter circuits coincide. so that when said coincidence signal is produced. said first counter circuit stops the counting of said stroke pulse. thereby reducing the stroke of said traverse member by a definite length for very production of clock pulse.  
  The embodiments of this invention which is applied to the traverse mechanism for yarn traverse guide are illustrated below with reference to the accompanying drawings.  
 In the drawings.  
  FIG. I shows the traverse mechanism for filament guide means in accordance with this invention.  
  FIG. 2 is a block diagram showing a drive mechanism for the traverse member of FIG. I.  
  FIG. 3 is a block diagram showing an example of the control device for the traverse member in a manner which reduce the upper limit value for every reversed of the traverse member in order to decrease the stroke.  
  FIG. 4 is a time chart to illustrate the operation of the control device of FIG. 3.  
  FIG. 5 shows counter circuits and a coincidence descriminating circuit in the control device pf FIG. 3.  
  FIG. 6 is a block diagram showing another example of the control device for the traverse member in a manner which increases the initial value for every reversed of the traverse member in order to reduce the stroke.  
  FIG. 7 is a time chart to illustrate the operation of the control device of FIG. 6.  
  FIG. 8 shows counter circuits and a coincidence descriminating circuit in the control circuit of FIG. 6.  
  FIG. 9 is a block diagram showing a further embodiment of the control device for the traverse members in a manner which reduces the upper limit values by means of clock pulses in order to decrease the stroke.  
  FIG. is a time chart to illustrate the operation of the control device of FIG. 9.  
  FIG. 11 is a block diagram showing still another example of the control device of the traverse member in a manner which increase the initial value by means of clock pulses in order to decrease the stroke. and  
  FIG. I2 is a time chart to illustrate the operation of the control device of FIG. II.  
  Referring to FIG. I, filament 1 fed from the filament supplying mechanism (not shown) is taken up on bobbin 3 and inserted into spindle I driven by belt 16, through traverse guide 2, to form package 4. Traverse guide 2 is attached to nut 5. and nut 5 due to the rotation of ball screw 6 performs reciprocating traverse motion along guide shaft 7. Constant-speed servo motor 8 rotates ball screw 6 clockwise (viewed from the top of FIG. 1) via gears 80. 6a and moves nut 4 and traverse guide 2 in the A direction at a constant speed. Constant-speed servo motor 8&#39; also rotates ball screw 6 counterclockwise via gears 8b. 6b and moves nut 4 and traverse guide 2 in the B direction at a constant speed. At one of ball screw 6 is attached disc 9 having a number of equally spaced apart pores near its periphery. Stroke pulse generator 10 is attached to frame 11 and produces a stroke pulse Pd in proportion to the rotating angle of disc 9, i.e.. in proportion to the distance of the movement of the traverse guide 2. Stroke pulse generator 10 may be a conventional photoelectric pulse generator consisting of a light source and opposing photoelectric elements, such as phototransistor, and a pulse amplifier. Since the rotating speed of ball screw 6 is constant. the stroke pulse Pd is produced at substantially definite intervals of time. Arm I2 is attached to nut 5 at the opposite side of. and at substantially horizontally to traverse guide 2. Referenceposition detector I3 is attached to frame 11 at a level Lo which nearly conforms to the center level of bobbin 3. The reference-position detector I3 which detects the passage of arm I2 may be of a conventional photoelectric type detector. like a stroke pulse generator.  
  The driving mechanism of traverse guide 2 is illustrated below with reference to FIGS. I and 2. Before filament l is wound on bobbin 3 inserted into spindle 15. a small length of filament is usually anchored to the waist roller (not shown) below the bobbin. or taken up by the aspirator. At this moment. the traverse guide 2 is at the lower limit Ll. Then switches 8,... S S are closed and the initiation signal S, is transmitted to the control circuit 20. Initiation signal S. turns output a of control circuit 20 ON (output b is OFF). and drive circuit 21 is thereby operated. The servo motor 8 rotates spindle shaft 6 clockwise. and traverse guide 2 starts to move toward the A direction from the lower limit position Ll. When traverse guide 2 reaches the reference position L0. arm 12 traverses over the detector 13, and detector I3 produces reference position signal Sd. Upon receipt of signal Sd. the control circuit 20 starts to count the numbered stroke pulses Pd transmitted from stroke pulse generator I0. After the start of counting. when the number of stroke pulses Pd received by control circuit 20 attains a setpoint value. output a of control circuit 20 is set to OFF and output b is set to ON. so that drive circuit 21 stops its operation and actuates drive circuit 21&#39; instead. As a result.  
 servo motor 8&#39; rotates ball screw 6 counterclockwise,  
 and traverse guide 2 is reversed to travel toward the B direction. Also when traverse guide 2 passes the reference position L0. reference position signal Sd is gener-; ated causing control circuit to start again the counting of stroke pulses Pd. As the number of stroke pulses Pdi counted attains the setpoint value. control circuit 20 output a is set to ON and output b is set to OFF. The traverse guide is again reversed to travel toward the A direction. The traverse guide 2 continues the reciprocating motion.  
  On the other hand. the control circuit 20 automatically and sequentially reduces the setpoint value for stroke pulses Pd. and hence the stroke of the traverse guide is gradually shortened. acquiring the so-called parallel wind motion. After a definite time or definite number of reversals. the control circuit 20 completes its winding by the parallel winding traverse motion. The  
 traverse guide 2 is then lowered down toward the B direction until it is stopped at the height of lower limit position LI by means of lower limit position detector 14. But is desired. the traverse guide 2 may be stopped at a suitable position. e.g.. just above the lower limit position L! for a short period of time for the purpose of forming a pig tail.  
  Methods of sequentially reducing the setpoint value for stroke pulses Pd for determining the distance between the reference position and the reversing position of traverse guide 2 consists of the following two: one method is to reduce the setpoint value for every reverse of the traverse guide 2, and the other is to reduce the setpoint value for every generation of a clock pulse. The setpoint value can be set as a difference between the upper limit value and the initial value of the counter circuit.  
  The following two types of control circuits are proposed in order to perform each of the above first and second methods: control circuits which sequentially reduce the upper limit value. maintaining the initial value constant (referred to the first and third type in this invention and control circuits which maintain the upper limit value constant and sequentially increase the initial value (referred to the second and fourth types in this invention). Control circuits of all types are discussed below.  
  A control circuit of the first type in which the upper limit value is reduced for every reversal of the traverse guide is illustrated with reference to FIGS. 3 and 4. The control circuit comprises gate circuit 22. consisting of AND circuit 23 and R-S type flip-flop circuit (bistable multivibrator circuit) 24, stroke pulse counter circuit 25. counter circuit 26 for setting the upper limit value, coincidence discriminating circuit 27. reverse command circuit 28 consisting of a flip-flop circuit. and AND circuit 29. The flip-flop circuit 24 is set by reference position signal Sd. and is reset by the initiation signal S and coincidence signal Se. The output signal Sg is ON when the flip-flop circuit 24 is set and OFF when the flip-flop circuit 24 is reset AND circuit 23 receives. as inputs, initiation signal 8.. output signal Sg of flip-flop circut 24. and stroke pulses Pd.  
  Stroke pulse counter circuit 25 is a binary counter circuit which is cleared to zero by the initiation signal S and coincidence signal. and counts the stroke pulses Pd which come through AND circuit 23 of gate circuit 22. Counter circuit 26 is provided for setting the upper limit value is a conventional binary counter circuit. and is set to the predetermined upper limit value M by the initiation signal S,. and reduces the upper limit value by one for every entry of coincidence pulse signal Se. Coincidence dcscriminating circuit 27 produces a coincidence signal Se when the counted value it of stroke pulse counter circuit 25 coincides&#39; with the counted value m of counter circuit 26 for setting upper limit value; the construction of which will be mentioned later in detail with reference to FIG. 5.  
  Reverse command circuit 28 is a T-typc flip-flop circuit in which output a is set to ON by the initiation signal S. which enters reset terminal R and then sets output b and output a ON alternately for every receipt of coincidence signal Se which enters trigger terminal T. Completion indicator circuit 29 is an AND circuit which. when a predetermined number No of traverses are completed. i.e.. when the counted value m of the counter circuit 26 for setting upper limit value reaches the determined value (M N0). produces a winding completion signal S...  
  The operaton of the control circuit 20 is mentioned below in more detail by referring to the time chart of FIG. 4. When the initiation signal S. is turned ON. the counted value it of the stroke pulse counter circuit 25 is cleared to zero. and the counted value m of the counter circuit 26 for setting upper limit value is set to a predetermined value M. Initiation signal S. causes output a of reverse command circuit 28 to be ON. so that the traverse guide 2 starts to move in the A direction from the lower limit position L1. As traverse guide 2 moves. stroke pulses Pd are generated. But since the flip-flop 24 has been reset by the initiation signal S, (Sg is OFF) and gate circuit 22 is closed. stroke pulses Pd are not transmitted to the counter circuit 25 and the counted value it remains zero.  
  When traverse guide 2 has reached the reference po sition Lo. the reference position signal Sd is generated. and signal Sd sets flip-flop circuit 24 to change the output signal 53 to ON. Two inputs 5,. 5,, of AND circuit then become ON. causing gate circuit 22 to open. and stroke pulses Pd are transmitted to stroke pulse counter circuit 25 thereby starting the counting. The counted value it of stroke pulse counter circuit 25 increases as traverse guide 2 moves in the A direction past the reference position Lo. Coincidence discrimination circuit 27 produces a coincidence signal Sc when the counted value it of stroke pulse counter circuti 25 coincides with the counted value m (=M) of the counter circuit 26 for setting upper limit value. The coincidence signal Se changes the state of RS type flip-flop circuit 28 so that output a is made OFF and output b ON. The traverse guide 2, in consequence. is reversed toward the B direction. Coincidence signal Se also causes flip-flop circuit 24 to be reset so that output signal Sg is made OFF. and gate circuit 22 is closed. As a result. stroke pulse counting circuit 25 stops the counting. Coincidence signal Se also clears the counted value it of stroke pulse counter circuit 25 to ZERO. Coincidence signal Se. in addition. reduces the counted value m of the counter circuit 25 for setting upper limit value by one with result that the value in become equal to M 1. Both counter circuits 25. 26. and coincidence descriminating circuit 27 will be illustrated later in more detail.  
  The traverse guide 2 continues to move toward the B direction. and when it reaches reference position Lu. reference position signal Sd is generated again. causing gate circuit 22 to open. and the counting of stroke pulses Pd is started again. When the counted value n of stroke pulse counter circuit 25, which increases from ZERO reaches the counted value m M l l of the counter circuit 26 for setting upper limit value. coincidence signal Se is generated again. The output b of the reverse command circuit 28 is made OFF and the output a is made ON. and traverse guidQ 2 is reversed again. Coincidence signal Se closes gatI circuit 22. and clears stroke pulse counter circuit 25 lb ZERO. Coincidence signal Se then reduces the counted value at of the counter circuit 26 for setting upper limit value by one with result that the value m bewme equal to M 2.  
 Control circuit 20 continues thdlsimilnr operation.  
 verse has been completed, completion indicating circuit 29 produces a wind completion signal 55. causing switches S S S to open. The winding operation by means of parallel wind traverse motion is now completed. and traverse guide 2 returns to the lower limit position L1.  
  The two counter circuits 25. 26. and coincidence discriminating circuit 27 are illustrated below with refernce to FIG. 5. Stroke pulse counter 25 which increases the counted value It for every entry of an input pulse. is a conventional binary counter circuit consisting of k units of flip-flop circuits. When a signal (S or Se) is applied to reset terminals R R R R,.. the state of each flip-flop (each bit). i.e.. x x is ZERO. and the state of other side. i.e.. R. E. 7 E... is ONE. In this way. in the above-mentioned counter circuit 25. the use of ar x x, as the counted value n causes the counted value n to be cleared to ZERO by the application of the reset signal. as shown in Table I. And the value it increases by one for every entry of an input pulse to the trigger terminal T Counter circuit 26 for setting the upper limit value. which will be set to a predetermined value which will be decremented by one for every entry of an input pulse. is also a conventional binary counter consisting of k units of flip-flop circuits. When a signal S is applied to reset terminals R R R R,.-. the state of each bit. i.c.. 3-,. v y is ZERO. and the state of other side. .31.. is ONE. In the counter circuit 26 comprised as mentioned above. the use of T. as counted value at causes said counted value an. after being set to a predetermined value. to be reduced one by one for every entry of input pulse Se to the trigger terminal T For example. to reduce the value one by one for every entry of the input pulse S with the upper limit maintained at M 75 (m lOOlOl l the complement of m. i.e.. 717 Ol lOlOO (see Table l may be set to the binary counter circuit (k I 7) of 7 bits. (method of setting will be mentioned later). ln this way. the complement it increases one by one for every entry of input pulse. and the counted value m decreases one by one.  
 values 11 and m of two counter circuits can be detected by comparing whether the state of all bits constituting the corresponding figures are identical. Whether the state of corresponding i-th bits .t&#39;. and? are equal or not can be determined from the equation,  
  When the result of Eq. l appears to be l the state of the corresponding i-th bits .r, andjfi are identical. and when the result appears to be 0&#39;, they are not equal. The result of Eq. l above is represented as an output of each comparative circuit 30. AND circuit 31 produces coincidence signal Se only when the outputs of all comparative circuits 30 are l.  
  A method of setting the counter circuit to W 01 10100 consists. as shown in FIG. 5, of first sending the initiation signal S, to the reset terminals R,. R R R (k 7) of each bit. so that the states n. y  
 . v,. of each bit are all 0&#39;. and then sending a delay signal S, composed of initiation signal S, which has been delayed for a very short period of time (e.g., 0.l see.) through the delay circuit. to the trigger terminals T T T so that the states v;,, 3- v.. of each bit are 1.  
  In the foregoing. with reference to the examples shown in FIGS. 3-5, we have illustrated the control circuit of the first type in which the values V\ A\\ k .r- ..r. of the counted value it is increased one by one from a definite initial value (00 .00) for each entry of stroke pulse Pd. and the values Y TI. Y of the upper limit value m is decreased one by one for every reversing. With the system of this type. however. it is also possible to use the state of each bit of the counter circuit from the opposite side. That is. the values Y m. of the counted value it are reduced one by one from a definite initial value (ll l l for every counting of stroke pulse Pd. and the values y ny of the lower limit value m is increased one by one for every reversal. As mentioned above, the control circuit according to this invention permits this to be accomplished in two ways. The circuit, however. is substantially the same.  
  The distance between the reference position L0 and a position where the reverse occurs, i.e. stroke [(mm) of the traverse guide is determined by pitch Dtmm/round) of ball screw 6. number d of pores of disc 9 (pores/round). and upper limit value m. Hence there exists a relationship.  
  in X D d Accordingly. the first stroke H,H, shown in FIG. 4. gives.  
 TAB LE 2 :W Ta M a .H Ti r .W .&#39;:i M rt H l l M 75 i 0 (J l U l l U l l U l U 0 M- I 74 l U l] l U l U U l l U l 0 l M J l 3 l U U l U U l U l l U l l 0 M 2172 l U U l U U U U l l U l l l M-r fl l l 0 U U l l l [l l l l U U 0 Coincidence discriminating circuit 27 is composed of Similarly.  
 H l-L. I (EM-&#39;5] X From the above. it will be understood that the stroke is shortened by 2D/d for every reversal. The length LH, of the first half-stroke is determined by the set-.  
 point M. For example, where D=6(mm/round) and d=30 (pores/round), M should be 750 to obtain L0H, 150 mm. Therefore. where M 750. the relationship 2&#39; 750 2 holds true. and accordingly stroke pulse counter circuit 25 and counter circuit 26 for setting upper limit value must he binary counters of at least l0 bits. The time required for the completion of winding can be found from the number of traverses. For example. if the initial upper limit is set to M. with the number of traverses required being No. the number of stroke pulses Pd produced before the completion of winding can be represented as (ZM-lH-(Z M3)+. .+[2M(2N0-l)}=N0(2MN0) Denoting the time interval separating successive stroke pulses Pd by AT. the winding time T can then be given by T=N0(2M-N0) A T. When the counted value m of counter circuit 26 for setting upper limit value reaches the predetermined value M N0. the completion com mand circuit 29 produces a winding completion signal Ss.  
  Control circuit of the second type which employs the system in which the upper limit value M remains constant and the initial value increases by one for every reversal is illustrated below with reference to FIGS. 6, 7 and 8. In FIG. 6. numerals correspond to those of HO. 3. The control circuit 20, consists of gate circuit 22 composed of AND circuit 23 and flip-flop circuit 24. stroke pulse counter circuit 25 counter circuit 26 for setting initial value. coincidence discriminating circuit 27, flip-flop circuit 28. AND circuit 29. upper limit sctted circuit 33, and delay circuit 34.  
  The gate circuit 22, composed of AND circuit 23 and flip-flop circuit 24, is opened by the reference position signal St and is closed by the coincidence signal Se. Stroke pulse counter circuit 25 is an ordinary binary counter circuit which is cleared to ZERO by the of initiation signal S and the delay control signal Sc&#34;. and increases the counted value by one for every entry of stroke pulse Pd. Upper limit setting circuit 33 is an AND circuit which produces a control signal Sc when the counted value n of stroke pulse counter circuit 25 reaches the upper limit value M (constant). The  
 lcounter circuit 26 for setting initial value is an ordinary binary counter circuit which is cleared to ZERO by the rising of the initiation signal 5 and increases the counted value m by one for every entry of control pulse signal Sc. Coincidence discriminating circuit 27 produces a coincidence signal Se when the counted value n of the stroke pulse counter circuit 25 and the counted value m of the counter circuit 26 for setting initial values coincide. lts construction will be mentioned later with reference to FIG. 8. Reverse command circuit 28 is a T-type flip-flop circuit which is set to ON by the initiation signal 5,, and thereafter sets outputs b. a alternately ON for every entry of control pulse signal Sc from AND circuit 33. Completion command signal 29 produces a wind completion signal 85 when the predetermined number No of traverses is completed. i.e., when the counted value m of counter circuit 26 for setting initial value reached the predetermined value No, Delay circuit 34 causes delays of very short periods of time (e.g.. 0.01 sec.) in order that the stroke pulse counter circuit 25 is prevented from being cleared to ZERO by control pulse signal Sc before the counted value m of counter circuit 26 is set to ONE by the same control pulse signal Sc.  
  The operation of control circuit 20 of HO. 6 is illustrated below in more detail with reference to time chart of FIG. 7. When the initiation signal S is set to ON. the counted values n and m of stroke pulse counter circuit 25 and couter circuit 26 for setting initial value are cleared to ZERO. causing output a of reverse command circuit 28 to be ON. Traverse guide 2 then starts to move for the lower limit position L1 in the A directionv Since flip-flop circuit 24 has been reset and its output signal Sg is in the OFF state. gate circuit 22 is closed so that stroke pulse Pd is not transmitted to stroke pulse counter circuit 25. If traverse guide 2 reaches the reference position L0. the reference position signal Sd is generated. Reference position signal Szl sets the flip-flop circuit 24., thereby causing its output signal Sg to be ON. Therefore. gate circuit 22 is opened. and stroke pulses Pd are transmitted to stroke pulse counter circuit 25 counting is then started.  
  As the counted value 11 of stroke pulse counter circuit 25 increases and reaches the upper limit M. all inputs of the upper limit setting circuit 33 are set to ON. producing control signal Sc. Control signal Sc changes the state of reverse command circuit 28. output a is set to OFF and output b ON. Traverse guide 2 is then reversed toward the B direction. Control signal Sc enters counter circuit 26 for setting initial value. and changes the counted value In from ZERO to ONE. Control signal Sc also enters delay circuit 34. and delay control signal Sc causes stroke pulse counter circuit 25 to be cleared to ZERO.  
  Development of control signal Sc causes no change to the state of flip-flop circuit 24. and gate circuit 22 remains open. Hence. stroke pulse counter circuit 25 continues the counting from the counted value n ZERO. Counting of one stroke pulse Pd makes it ONE: the counted value n of stroke pulse counter circuit 25 will be in coincidence with the counted value in of counter circuit 26 for setting initial value (n m l). Coincidence discriminating circuit 27, therefore. produces coincidence signal Se. Coincidence signal Se resets flip-flop 24, rendering its output signal Sg OFF. Gate circuit 22. therefore, is closed. and stroke pulse Pd is not transmitted to stroke pulse counter circuit 25, so that the counted value it of counter circuit 25 which has now stopped the counting is maintained at ONE. When transverse guide 2. moving in the B direction. reaches the reference position L0. the reference position signal St! is generated setting the output signal Sg of flip-flop 24 ON to open gate circuit 22. As a result. the stroke pulse counter circuit 25 again starts the counting from n ONE. As the counted value It increases and reaches the predetermined upper limit value M (constant). i.e.. if M 1 units of stroke pulses Pd are counted, AND circuit 33 generates a control signal Sc. Control signal Sc changes output I) of reverse command circuit 28 to OFF and output a to ON. and causes traverse guide 2 to be reversed toward the A direction. Control signal Sc. furthermore. changes the counted value in of counter circuit 26 for setting initial value from ONE to TWO. Delay control signal St&#34; clears the stroke pulse counter circuit to ZERO. Stroke pulse counter circuit 25 continues the counting. and when n TWO is obtained. coincidence discriminating circuit 27 produces a coincidence signal Se. Coincidence signal Se closes gate circuit 22. and maintains the counted value it of stroke pulse counter circuit 25 which has now stopped the counting to TWO. Control circuit repeats the similar operation; initial value m increases by one for every reversal, and the setpoint value (i.e.. upper limit value minus initial value) decreases by one correspondingly so that the stroke of traverse guide 2 is shortened gradually. When a prede termined number No of traverses is completed. completion indicating circuit 29 produces a wind completion signal 55, and switches SW SW3. Sn are opened. completing the winding operation. Setting the length of initial stroke and the estimation of time required for winding can be done as in the case of control circuit 20 of the first type (FIGS. 3, 4. and 5). The two counter circuits 25. 26 and coincidence discriminating circuit in the control circuit (FIG. 6) of the second type are illustrated in FIG. 8 in detail, and depend for their operation on the same principle as those shown in FIG. 5. Stroke pulse counter circuit and counter circuit 26 for setting initial value are ordinary binary circuits which increase the counted values (n. m) by one for each input pulse. For example. if the counter circuit 26 is a binary counter circuit having 7 hits. the counted value in (y; y r;, y. 3, y,) for each input pulse (Se) will change as shown in Table 3 below.  
  The counted value it (x .t x x x x x of the stroke pulse counter circuit 25 also changes in the same way as shown in Table 3 in response to the entry of input pulse (Pd)v Coincidence of the counted values it and m can be detected by the coincidence discriminating circuit 27. consisting ofa plurality of comparitive circuits 30 and an AND circuit 3]. Whether the state ofi-th bits 13. corresponding to both counter circuits 25, 26 are equal or not can be determined from the equation,  
  I +.T (I) The result of Eq. (2) can be represented as an output of the comparative circuit 30 composed of two AND circuits and one OR circuit. When the state of all bits corresponding to both counter circuits are equal. the outputs of all comparative circuits 30 will be I and AND circuit 31 will produce a coincidence signal Se.  
  In the foregoing, with reference to examples of FIGS. 6-8, we have illustrated a control circuit of the second type in which the values .r .r x of the counted value it are increased one by one for every entry of stroke pulse. and the values )id&#39;ir-i y r, of the counted value m are increased one by one for every entry of the coincidence signal Se. With the system of this type. however, it is possible to express the value in the following way by using the state of each bit of the counter circuit from the opposite side. That is, the value .11. T T. of the counted value it is decreased by one for every entry of stroke pulse. and the value T ai if, of the counted value m is decreased by one for every entry of the coincidence signal Se. In this way. the control circuits of systems in accordance with this invention can express the values in two ways. But  
 since the circuits are substantially the same, the description hereinafter will proceed with the former expression method.  
  If now M (lOOlOl l the purpose of the AND circuit constituting the upper limit setting circuit 33 in FIG. 6, can be achieved by applying the state x x x x, of bits of stroke pulse counter circuit 25 as an input. The AND circuit, of course. may be applied with the state of 1&#39; X... X X x x, of each bit as an input.  
  The tapered portion of the package formed by control circuits 20 of the above first and second types which reduce the stroke by a definite length for every reversal. acquires a curve of somewhat convex-shape. This results from a constant filament feeding speed and a constant traveling speed of the traverse guide. wherein the ratio of package diameter increasing per stroke is on the decrease with the increase of package diameter. while maintaining a constantly decreasing ratio of stroke. The form of tapered portion can be analyzed as follows:  
 ( 10 nAj n r(n) r0 Ar dn t Ar 2Irn n I An where.  
 n is the number of traverse, I (n) is the length of a half-stroke of the n-th traverse. I0 is the length of a half-stroke of the first traverse, A! is the amount by which the stroke reducer driving each reversal. r( ii) is the radius driving package of the n-th traverse. m is the radius of bobbin, Ar is the amount of package radius which by which the package radius increases during each traverse, T(n) is the time required for a half-stroke at the n-th traverse. 1-0 is the traverse speed (constant), in; is the filament feeding speed (constant). AD is the amount by which the radius increases per winding. From the above. we obtain a relationship,  
  From Eq. (3) above. it will be understood that the tapered portion of the package acquires a parabola shape. This conforms to the fact that the tapered portion acquires the curve of somewhat convex-shape. Selecting the parameters of Eq. (3) above appropriately. it is possible to vary the form (inclination. etc.) of the tapered portion. Usually, the inclination of the tapered portion can be adjused by changing the amount AI by which the stroke is reduced for every reversal. To change Al. for example. the number d of pores of disc 9 may be changed.  
  As methods for reducing the setpoint by changing the upper limit value or the initial value, we have so hlustrated control circuits of the first and second types which make use of pulse (Se) produced at the time of reversing. We should now mention the contorl circuits of the third and fourth types. employing a system which reduces the setpoint value for every definite interval of time using a clock pulse. This method can be classified to the third type control of circuit which reduces the upper limit value while maintaining the initial value at constant (ZERO) and the fourth type control circuit which increases the initial value maintaining the upper limit value constant.  
  First. the third type of control circuit employing a method of reducing the upper limit value using a clock pulse is illustrated below with reference to FIGS. 9 and 10. The third type of control circuit is constructed in the same manner as the control circuit 20 shown in FIG. 3. except for the inclusion of clock pulse generator 36 and clock gate circuit 37. and operates in a slightly different manner that the counted value In of the counter circuit 26 for setting upper limit value is decreased by one for each clock pulse Pr. Clock pulse generator circuit 36 is a conventional pulse generator circuit which de-multiplies the pulse produced by the astable multi-vibrator in order to produce clock pulses P! for every interval of time 1 (constant). Clock gate circuit 37 is an AND circuit which receives. as inputs. an initiation signal S and clock pulses Pt. Other elements correspond to those shown in FIG. 3 (indicated by same numerals). The operation of the third type of control circuit 20 shown in FIG. 9 is as diagrammed in the time chart of H0. 10. The operation of the first type control circuit (FIG. 4) is equal to the operation of the third type control circuit except in the method of chaning the upper limit value m. According to the first type of control circuit. the upper limit value m is reduced by one by a coincidence signal Se which will be produced simultaneously with the reversal of the traverse member. whereas the counted value m of the third type of control circuit 20 is reduced by one for every production of clock pulse Pt.  
  If the time interval 1 of clock pulses Pt is made nearly equal to the time required for the initial traverse (m) as shown in FIG. 10. a clock pulse P: is generated for every traverse (Fl FE. m. H HJ. and the upper limit value In is reduced by one. But as the time required for the traverse gets shorter and shorter. no clock pulse Pt is generated during the traverse of H H Hence there exists a relation LOH; L0H For example. in FIG. 10, lfit is assumed. where m M 50 that the time interval 1 of clock pulse P1 is 100 times when the interval rT at which stroke pulse Pd is generated, as well as if the initial clock pulse P. is generated at the time of n 27. then the upper limit M will be 49 on account of clock pulse P The traverse memeber is reversed when the counted value n reached n 49. and hence the next clock pulse P will be generated when 100 [(49 27) 491= 29 That is. the next clock pulse P, will be generated when 29 units of stroke pulses are produced after the reference position L0 of the next traverse FIE has been passed. The upper limit value m will then be m 48. In the same way. P is produced between traverse H, a when n 100 [(48 -29) +48]= 33. so that m 47, z d tccordingly P, will be generated between traverse H H when n 100 [(47 33)]+ 47 39, so that m 46. The next clock pulse P; will not be produced between traverse m because 100 [(46 39) 46l= 47 46 m. but will be produced when a stroke pulse Pd is produced after the reverse of the traverse member. Similarly, P will be produced with 10 pulses Pd are generated after the traverse member has been reversed. Practically, however, the upper limit values m are far greater than the above illustrated examples, and the ratios of the time interval 1&#39; of clock pulses P! to the time interval AT at which stroke pulse Pd are generated are far greater than those shown above. But the principle is quite the same.  
  As mentioned above. the third type of control circuit 20 reduces the upper limit value or by one for every definite interval of time T in order that the traverse guide 2 assumes the reciprocating motion of which stroke becomes gradually shorter.  
  Next. we should illustrate the fourth type of control circuit 20, employing a system in which the initial value increases for every definite period of time using a clock pulse, with reference to FIGS. 11 and 12. The fourth type of control circuit 20 is constructed in the same manner as the control circuit 20 FIG. 6 of the second type. except for the inclusion of a clock pulse generator 36, clock gate circuit 37, monostable multivibrator 40. and auxiliary gate circuit 39 consisting of AND circuit 41. Delay circuit 34 contained in the second type control circuit 20 is not needed here. and hence it is omitted.  
 The clock pulse generator 36 produces a clock pulse Pt for every definite period of time 1 (constant) in the same way as produced by the third type of control circuit 20 (FIG. 9); the counted value m of the circuit 26 for setting initial value starts from ZERO and increases by one for each clock pulse Pr. The auxiliary gate circuit 39 consisting of monostable multivibrator 40 and AND circuit 41, works to block the coincidence signal Se for a very short period of time just after the production of reference position signal Sd for the purpose of preventing the gate circuit 22 from being closed just after the production of the reference position signal Sd. The operation of the fourth type of control circuit 20, shown in FIG. 11, is as diagrammed in the time chart of FIG. 12. The operation of the fourth type of control circuit is identical to the second type of control circuit (FIG. 7). except for the method of changing the initial value. With the second type control circuit. the counted value m of the counter circuit 26 for setting initial value increases by one for each control signal Sc produced simultaneously with the reversing. whereas with the fourth type of control circuit 20, the counted value In increases by one for every production of clock pulse Pt. Briefly illustrating the operation of the fourth type of control circuit 20, if the time interval of clock pulse P! is allowed to be equal to the time required for the initial traverse (m) as shown in FIG. 12, then a clock pulse Pt will be produced for every traverse (H,H 2H3, H H and the counted value m of the counter circuit 26 will be increased by one each time. However, the periods required for the traverse. which is on the decrease. will not allow the production of a clock pulse during the traverse of HF. leaving the counted value or maintained at 4. Hence a relation LOH, LOH; holds. ln FlG. I2, if a clock pulse P is produced while the counted value it of the stroke pulse counter circuit is maintained at n 5. the counted value In of the counter circuit 26 will increase by one to become m 6. When the reference position signal Sd is generated. the counting of stroke pulse counter circuit 26 is started again, and when the counted value it is increased by one to become n 6, a coincidence signal Se is produced. in this instance, however, due to the operation of the gate circuit 29, composed of monostable multivibrator 40 and AND circuit 4!, coincidence signal Se will be blocked and corrected coincidence signal Se is not allowed to become ON. The control circuit in the same way reduces the upper limit value In by one for each definite interval of time 1&#39; so that the stroke of traverse guide 2 shortens gradually.  
  With the third and fourth types of control circuits 20, the time required for completing the winding can be set precisely by the counter circuit 26 for setting upper limit value (or initial value). That is, if the reciprocating motion is completed when the upper value (or initial value) reaches the predetermined number M No (or No), then the time required for winding will be No Consideration should now be directed to the shape of the package formed by the control circuits 20 of the above-mentioned third and fourth types according to which the setpoint is reduced by one for each definite interval of time 1&#39; so that the stroke is reduced by a definite length each time. With this method, the tapered portion of the package is substantially linear and not curved. This is desirable for increasing the stability of the package. The following reasons may presumably be causes that the tapered portion acquires a linear shape. The rate of frequency of reversing direction responsive to the production of clock pulse Pl (varies with shortening stroke) increases with the increase of diameter due to the continuing reciprocal motion. Also the rate of increase of the diameter during one stroke decreases with the increase of diameter. These factors compensate or offset each other so that the amount of diameter increased compared to the amount of stroke decreased are nearly equal.  
  The shape of the tapered portion can be analyzed as follows:  
  O 1) 2n it) 1ft) where,  
 I is time,  
 [(1) is the length of a halfstroke of traverse,  
 I0 is the length of a half-stroke of the initial traverse (about 0.2 m),  
 r is the time interval of clock pulse PI (about 24 see),  
 A! is the amount of half-stroke reducing for every production of clock pulse Pr (about 0.2 X 10 m r(t) is the radius of package,  
 r0 is the radius of bobbin (about 0.025 m),  
 Ar is the rate by which the package radius increases per unit time,  
 in) is the filament feeding speed (about 45 m/sec),  
 AD is the amount of radius increasing per winding (about 0.] X l0 m),  
  Values in parenthesis denote those used in embodiments. From the above, we obtain a relationship,  
  From Eq. (4), it will be understood that the shape of the tapered portion of package is in the form of an exponential curve. Since l-[(21rAl)/(wm-AD)](r ru)l is sufficiently less than 1, Eq. (4) can be approximated to Irrlu-U I n-MAD U m) As will be understood from Eq. (5 the tapered portion of package takes the form of a substantial straight line. Also, appropriately selecting the parameters of Eq. (5) above, it is possible to freely determine the inclination of the tapered portion. Usually, inclination of the tapered portion, i.e., the rate of stroke length l decreasing with the increase of radius r, can be adjusted by changing the time interval 1&#39; of clock pulse PI.  
  The foregoing dealt with the control devices of the four types used for controlling the yarn guide members of this invention. Also, in the description of the counter circuits, if the conditions for each bit and the binary relationship between 1 and 0 are specified in opposite order, the expression &#34;the counted value increases by one can be replaced by the counted value decreases by one.&#34; Accordingly, it should be taken that the expression, the counted value increases (decreases), merely specifies the relationship between the two counter circuit (25, 26). And it will be clear that these control devices are also applicable to the instances where the ring of the ring twister is being reciprocated, as well as the instances where the spindle of the Flyertype twister is being reciprocated.  
  it should also be understood that the setups of the control circuit in accordance with this invention make it possible to provide a variety of modifications. For example, the stroke pulse counter circuit 25 which starts. the counting with the production of the reference position signal Sd, may be made to start the counting after certain periods have passed from the time of the production of the signal Sd. Since the traverse speed is always constant, the stroke of all traverse is merely lengthened by a definite length. Also, FIG. 1 shows a rod-like arm 12 of which width is negligible, but the arm of a definite width may be used instead. in this case, the reference position signal Sd assumes a rectangular wave of a definite width. And if the counting of stroke pulses is started from the instant of rising (OFF to ON) of the reference position signal Sd, the length; of the stroke will be shorter by the width of arm com-l pared to the instance where a rod-like arm is used.i Conversely, if the counting of stroke pulses is started from the instant at which the signal Sd is turned to OFF, the length of the stroke is lengthened by the width of arm. Furthermore, a delay circuit, which upon receipt of a command of reverse from the control circuit effects the reversing after certain periods have passed, may be used. In this way, it will be understood that the use of a variety ofDelay makes it possible to reduce the number of bits in counter circuit 25 and 26.  
  ln the foregoing. the present invention was illustrated with reference to control circuits of four types. but it should be understood that this invention is not limited to the examples disclosed and shown in the specification and drawings but should be regarded that all possible modifications covered by claims belong to the scope of this invention.  
 What we claim is:  
  l. A method of controlling the traverse member of winders in parallel winding, comprising the steps of:  
 producing pulses every time the traverse member moves a predetermined distance;  
 defining a reference position along the path of the traverse member;  
 counting the number of said pulses from the time at which said traverse member has passed the reference position;  
 reversing said traverse member when the number of pulses counted has reached a predetermined setpoint value; and.  
 reducing said setpoint sequentially whereby the stroke of said traverse member becomes progressively smaller.  
  2. A method as set forth in claim 1 wherein said setpoint value is reduced sequentially for every definite numbers of reversing of said traverse member.  
  3. A method as set forth in claim 1 wherein said setpoint value is reduced sequentially for every definite interval of time.  
  4. An apparatus for controlling the traverse member winde s in parallel winding comprising:  
 a means for producing stroke pulses every time the traverse member moves a predetermined distance;  
 a means for producing a reference position signal when said traverse member has passed a predetermined reference position;  
 a first counter circuit operatively coupled to said ref crence producing means which starts to count said stroke pulses from the time at which said reference position signal is produced and successively increases the counted value by one;  
 a second counter circuit operatively coupled and which counts the reversing of said traverse member and succesively reduces by one the counted value which has been preset;  
 a coincidence discriminating circuit operatively coupled to said first and second counter circuits and which produces a coincidence signal when the counted values of said first and second counter circuits coincide with each other; and  
 a circuit operatively coupled to said coincidence discriminating circuit and which upon receipt of said coincidence signal causes said traverse member to to be reversed, whereby the stroke of said traverse member is shortened by a definite length for every reversing.  
  S. A control apparatus as set forth in claim 4, wherein the second counter circuit for counting the reversing of said traverse member counts said coincidence signalv 6. A control apparatus as set forth in claim 4, wherein said first and second counter circuits consist ofa binary counter circuit, said coincidence discriminating circuit consists of a plurality of comparative circuits and an AND circuit which receives as inputs outputs of said comparative circuits. and said comparative circuits being connected to the figures corresponding to both counter circuits and when the state of bits constituting respective figures are x v., said comparative circuits constitute a logical circuit producing an output of my, x v, and output signal of said AND circuit being used as a coincidence signal.  
  7. A control apparatus as set forth in claim 4, wherein the circuit for reversing the traverse member has a flipflop circuit which will be triggered by said coincidence signal.  
  8. An apparatus as set forth in claim 7, wherein said winder comprises; a spindle in which is inserted a bobbin. a ball screw which has been positioned in parallel with said spindle and will change its rotating direction responsive to the output signal of said flip-flop circuit. a fixed frame to support said ball screw, a nut fastened to said ball screw. a guide shaft capable of moving in the axial direction of said ball screw without rotating said nut, a traverse member attached to said nut. means for producing said stroke pulses in proportion to the rotating angle of said ball screw, and a position detector which produces said reference position signal when said nut came near the center of said ball screw.  
  9. An apparatus as set forth in claim 8. wherein said traverse member is a guide to engage with filaments.  
  10. An apparatus as set forth in claim 8. wherein said traverse member is a ring of a ring twister.  
  ll. An apparatus as set forth in claim 8, wherein said ball screw is actuated by two servo motors, one servo motor being started when one output of said flip-flop circuit is made ON. thereby rotating said ball screw in the clockwise direction via a gear at a constant speed. and the other servo motor is started when the other output of said flip-flop circuit is made ON, thereby rotating said ball screw in the counterclockwise direction via a gear at the same constant speed as said speed in the clockwise direction.  
  12. An apparatus as set forth in claim 8, wherein means which produces said stroke pulses comprises a disc attached to an end of the ball screw. said disc having. on its periphery, portions which permit the passage of light and portions which do not permit the passage oflight arranged alternately and maintaining an equally spaced-apart relation, and a light source and a photoelectric element provided on said frame in such a manner as to face each other with the peripheral portion of said disc sandwiched therebetween.  
  13. An apparatus as set forth in claim 8, wherein said position detector consists of a light source and a photoelectric element provided on said frame in such a manner as to face each other and is actuated by the arm attached to said nut.  
  14. A control apparatus as set forth in claim 4, fur ther comprising a gate circuit operatively coupled and which will be opened by said reference position signal and will be closed by said coincidence signal. said first counter circuit counting stroke pulses which have passed through said gate circuit. and the counted value of said first counter circuit being cleared to zero by said coincidence signal.  
  15. An apparatus for controlling the traverse member of winders in parallel windings, comprising:  
 means for producing stroke pulses every time the traverse member moves a predetermined distance;  
 a means for producing a reference position signal when said traverse member has passed a predetermined reference position;  
 a first counter operatively coupled to said reference producing means and which upon receipt of said