FR2712273A1 - Bobbin winding control to give consistent winding even on a change of wound yarn - Google Patents

Abstract

To control the operation of a bobbin winder, the bobbin dia. is registered directly for bobbin winding control. Also claimed is an appts. with a monitor (133) at the reciprocating yarn guide system to measure the bobbin dia. Pref. the control action is applied to the reciprocating yarn guide and/or the bobbin rotary speed. The bobbin dia. is measured at the bobbin where the yarn is wound. The monitor is protected by a shrouding (143) on a mounting (117) apart from the yarn guide.

Description

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  The present invention relates to a method for

  guiding a wire from a wire feed by a back-and-forth guide

  comes and winds it on a spool driven in rotation by a spindle, for example a method for winding by a bobbin winder and, more particularly, a method for controlling the back-and-forth of the guided back-and-forth so

  than a device for implementing this method.

  In the bobbin winder as shown in Figure 4, each of the multiple pins 1 is provided with a bobbin body 2 and a guide bar 4 is mounted vertically movable relative to the bobbin body 2. A guide 5 back and forth to guide the wire of a coil P is provided for each spindle. The wire Y on the coil P is guided by the reciprocating guide 5, being wound in the form of a bobbin 6, around the coil body 2 which is rotated by the spindle 5 while moving vertically the up and down guide 5 up and down on a

specific width back and forth.

  The guide 5 gives the thread a reciprocating movement during the winding of the chain while gradually decreasing the width TW of the reciprocating from the start of the winding to the end of the winding as shown in the Figure 3 (b), thus forming the bobbin (a spool) 6 having tapered tapered portions 6a at both ends

  upper and lower, as shown in Figure 3 (a).

  The back-and-forth guide 5 of the prior art uses a cam to change the width of the back-and-forth, and cannot respond to a change in the type and speed of winding of a wire to be wound. It therefore becomes necessary to perform a test winding and an adjustment of the cam to

  each time a change is made.

  The object of the present invention is to provide a method for controlling the winding operation of a winder which is capable of solving the above described problem and which makes it possible to produce a reel having a good desired shape of the winding even if the we change the type of

wire and the like.

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  In order to achieve the above objective, the present invention relates to a method for controlling the winding operation of a winder to form a spool by rotation of a spool body while a thread has a movement of back-and-forth in axial direction of said coil body by means of a back-and-forth member, and according to this method, the diameter of a coil is directly detected and the control relating to the winding is carried out according to the detection result. According to the above-mentioned construction, a coil having a good shape can be produced by directly detecting the diameter of a coil during the winding operation and the winding control can be accomplished according to the result of the detection of the diameter, c that is to say that one controls the back and forth of a wire or the

  control of the speed of rotation of the coil body.

  The invention will be better understood and other aims, characteristics, details and advantages thereof

  will appear more clearly during the description

  Explanatory which will follow made with reference to the accompanying schematic drawings given solely by way of example illustrating several embodiments of the invention and in which: - Figure 1 is a diagram showing an embodiment of the present invention; - Figure 2 is a view showing the shape of a can to explain the winding according to the present invention; - Figures 3A and 3B show a bobbin wound by a bobbin winder and the change in the width of the back and forth during winding; - Figure 4 is a view showing the bobbin winder; - Figure 5 is a plan view showing another embodiment of a device for controlling the back-and-forth movement of a winder according to the present invention; - Figure 6 is a side view of Figure 5;

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  - Figure 7 is a side view showing the entire bobbin winder; - Figure 8 is a plan view of Figure 7; and

  - Figure 9 is a front view of Figure 7.

  An embodiment of a method for controlling the back-and-forth movement of a winder according to the present invention will be described below in detail with reference to

attached drawings.

  In Figure 1, the spindle 1 is of the belt driven type; for example, a unit formed of eight pins, although not shown, is rotated in contact with a belt, to drive the body of

  coil 2 which is mounted on pin 1.

  The reciprocating guide 5 for guiding the wire Y from the wire supply spool (not shown) is connected to a bar 4 which is raised and lowered by means

  of a lifting device 3 over a specific width of

  back and forth along the axial line of the coil body 2 while being guided by a guide which is not shown. Indeed, the bar 4 is suspended vertically mobile at its two ends by a belt 7 or the like, and the other end of the belt 7 is guided by pulleys 8 which are connected to a ball nut 9. The nut to ball 9 is provided in engagement with a ball screw 11 which is connected to a reversible motor 10. While the screw 11 performs a normal or reverse rotation with the normal or reverse rotation of the reversible motor, the ball nut 9 rises or descends so vertically move the guide 5 by the

  belt 7 over a specific width of back and forth.

  The speed of the reversible motor 10 is detected by a sensor 12, the detected value of which is entered into a control device 13. The control device 13 is designed to change the number of revolutions of the spindle 1 (rotation speed of a coil body), which is not

represented.

  The guide 5 is provided with a laser distance sensor 14 to detect the winding diameter of the bobbin 6 and

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  information about the winding diameter is

  introduced into the control device 13.

  The direction of laser emission from the laser distance sensor 14 is determined so that it can detect the diameter of the bobbin 6 which is at a position

  winding or close to it.

  The control device 13 is capable of detecting the position of the guide 5 from a detected value of the sensor 12 and of controlling the rotation of the reversible motor 10 so thus controlling the width of the reciprocating motion, by controlling the reversible motor 10 in order to obtain a preset width back and forth relative to the diameter of the winding and in

  additionally controlling the speed of the spindle 1.

  The sensor 14 which is used has a good precision which makes it possible to discriminate the difference of the

  diameter of the winding of the diameter of a single wire.

  According to the method described above, the spindle 1 is rotated while the wire Y coming from the supply reel P is guided by the guide 5. The wire Y at the position of the guide 5 is wound on the body of coil 1

  to form a bobbin (a coil) 6.

  In this case, the control device 13, receiving a type of wire to be wound, a final form of the winding (weight)

  and a wire winding speed, adjusts the back-and-forth width

  comes TW based on the diameter D of the winding measured by the

laser distance sensor 14.

  The relationship between the type of wire, the form of winding, the speed of the wire and the diameter of the winding will now be explained. First, in Figure 2, r0 is the radius of the spool body 2, r1 is the winding radius, 0 is the angle of the tapered upper and lower portions 6a of the bobbin 6, 10 is the total length of the bobbin 6, 11 is the length of the straight line section 6c, h1 is the height of the tapered body of the tapered portion having the radius r1 as the base surface and h0 is the height of the tapered body

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  having the radius r0 of the coil body as the base surface. There, the volume Va of a conical base having for height (h1 - h0) and the radius of the base r1 can be expressed by Equation 1. 1 2h 1 2h V1 = 3-r1 h1 - -irr h0. .. 1

3 3

  Similarly, as tanO = r1 / hI = ro / h0 and h1 = r1 / tanO and h0 = r0 = tanO, Equation i can be expressed in terms

from Equation 2.

  r2 r1 2 k Va = --r1 r r) V 3 while tan8 i X 3 3 3- (r - 3) ... 2 3 tan8

  There, the length 11 can be expressed by Equation 3.

  11 = 10 - 2 (h1 - ho) 2 (ri ro tan8 tan8 = 1o 2 - _q -) .... 3 tan8 tan8 Consequently the volume Vb of a body having a

  length 11 is given by Equation 4.

  Vb = nr121o =; rl2 11 tan (2 =, zr2 {îî - t (r1 - o) 4 as long) Consequently the volume V of the bobbin can

express yourself by Equation 5.

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  V = 2Va + Vb - n210 2x 3ta (r13 - ro3) =; r12 {l - (r1 - ro)} - ro210 ... 5 In Equation 5, with the radius r0 of the coil body 2, l ' angle O of the tapered portion 6a, and the total length 10 of the bobbin 6 introduced as winding conditions, the volume V can be calculated if the radius rI of the

  coil body 2 which is in winding is known.

  Then, the volume V1 at the moment when the radius of the winding is r1 can be expressed by V1 = Weight -. winding density = (Wire thickness x

  wire speed x Time T1) - wire density.

  In this equation, the density of the wire is the value obtained by dividing the weight of the wire per unit of length by

  the volume of the wire per unit of length.

  When we have wire thickness x wire speed + wire density equal to the constant K,

V1 = K * T1

  The value of V1 can be found if the radius rI of the winding is known. Consequently, in the case of a wire of known thickness and density, the value of K is proportional to the speed of the wire. Likewise, we can find

  the relationship between time T1 and the radius of the winding r1.

  Then, the relation between the radius of the winding and the

  back and forth width will be explained.

  The width 11 of the reciprocating radius rI is 11 = 10 - 2 / tanO * (rI - r0) Therefore it is necessary to constantly decrease the width of the reciprocating 10 - 11 = 2 / tanO AT

(r1 - r0) during time T1.

  Similarly, in order to allow winding at a constant speed of the wire Ys, the winding speed must be

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  decreased by Ys (l / 2iro - 1 / 2nrl) during time T1 because the speed P1 of the spindle at time of rI is P1 = Ys / 2nr1 and

  the initial speed of the spindle P0 is P0 = Ys / 2r0o.

  It therefore becomes possible, as described above, to establish the back-and-forth width according to the diameter of the winding if this diameter is known. As the width of the back and forth is controlled while measuring the diameter of the winding, the bobbin can be reliably wound to a desired shape if the desired shape of the bobbin (including for example the final diameter of the bobbin , the final length of the bobbin and the angle of the tapered portion) has been entered. Then, when the bobbin has reached a desired final diameter, the machine is stopped, which makes it possible to obtain a full bobbin in a stable manner in comparison with the case of checking a full bobbin by time. In this case, the diameter of the winding is

  directly detected by the laser distance sensor 14 below

  above described, but the bobbin can be photographed by a camera (for example a CCD camera) to calculate the

  bobbin diameter based on the area photographed.

  The bobbin diameter can also be detected by means of an ultrasonic sensor. Furthermore, as given by Equation 5, the diameter of the winding can be indirectly determined on the basis of time if the type of wire, the speed of the wire and the speed of the spindle are known. The width of the back and forth can be controlled according to the diameter if you change the type of wire and the speed, which allows to obtain a bobbin of a good desired shape. This bobbin diameter can be seen by measuring a bobbin on a single spindle; moreover, taking into account a break in the wire and a variation between the pins, the measurement can be made of the diameter of a bobbin

  on at least two pins. In the embodiment below

  above, an example applied to the bobbin winder has been described. The present invention applies to this type of winder, that is to say to a winding device o a body

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  spool is rotated to wind a wire while the wire is reciprocating along the axial line of the

coil body.

  In the above-mentioned embodiment, the width of the back-and-forth is controlled in response to the diameter of the winding of a coil. However, other factors are

  relating to winding conditions such as the speed of the

  back and forth, the position of the back and forth return point, the speed of rotation of the coil body etc., can be

  checked in response to the diameter of the winding of a coil.

  Below, an embodiment will be illustrated making it possible to undertake the above process, that is to say a device for controlling the reciprocating movement of a winder which allows an appropriate measurement of the diameter. of the

can.

  In order to properly measure the diameter of the bobbin, a sensor for measuring the diameter of the spool is provided on a reciprocating member which moves along the axis of

rotation during winding.

  The sensor, in the above construction, is used to measure the diameter of the winding portion of the wire of a coil according to the movement of the reciprocating member so as to be able to properly measure the desired diameter of the can. An embodiment of a device for controlling the back-and-forth movement of a bobbin winder according to the present invention will be explained with reference to the accompanying drawings. First, a bobbin winder 101 will be explained with reference to Figures 7 to 9. The bobbin winder 101 mainly consists of a winding mechanism 103 which

  rotates a coil body 102a and a valve mechanism

  back and forth 104 which gives the y y a back and forth movement.

  The winding mechanism 103 has a number of pins 106 which are juxtaposed on both sides of a frame 105 of the machine and a drive motor 108 for driving

  the pins 106 in friction contact with a belt 107.

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  16 pins 106 are provided per illustrated bay; a rotary shaft 109 which is the axis of rotation of the winder extends upwards so that the reel bodies 102a can be vertically inserted at two heights on the rotation shaft 109. The motor 108 is mounted in a box 110 adjacent to the extreme longitudinal part of the frame 105 of the machine and on an output shaft 111 is mounted a pulley 112 around which the belt 107 passes. The pulley 112 rotates the belt 107 at a rapid speed in cooperation with a number of tension pulleys 113

  which are placed near pin 106.

  The back-and-forth mechanism 104 has a member 115 for guiding the y-wire from the spool 114 for supplying the yarn to a spool body to thereby form a bobbin (a spool) and a means for vertical drive 116 for moving the member 115 back and forth movement up and down. The member 115 consists of a bar 117 which is placed in the center in the direction of the width of the frame of the machine and which extends in a longitudinal direction and of a guide 118 which is mounted on the end of base of the bar 117 and which extends near each pin 106. The bar 117 has the shape of a hollow rod whose length corresponds to a span; in this control device, two bars 117 with reciprocating movement are juxtaposed to correspond to the two stages of the coil bodies 102a. These bars 117 are connected at their two ends and in a central position to a longitudinal plate 119, being vertically separated by a distance corresponding to the length of the coil bodies. On the extreme front side of the guide 118 is formed a thread engagement section 157 which is curved along the peripheral surface of the bobbin 102, thereby diverting the path of the thread arriving there through the tensioner 120, on the side of the

bobbin 102.

  The lifting drive means 116 consists of a servomotor 121 which is mounted at the upper part of the box 110, of a ball screw 124 driven by the

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  servomotor 121 for vertically moving two lifting members 122 and 123, belts 125 and 126 installed between the lifting members 122 and 123 and the bar 117 and a rail 127. The servomotor 121 is used to change a speed, a direction of rotation and an output by commands according to control signals entered, and it is connected by wiring to a controller 128 which is mounted on the extreme outer side of the cabinet 110. The ball screw 124 extends vertically; its upper end is connected to the output shaft of the servomotor 121 while its lower end is supported on the box 110 by a bearing 129. To each of the lifting members 122 and 123 is attached one end of the first belt 125 by a member mounting 130 while the other end of the first belt 125, which is diverted by a guide roller 131, is connected to the rail 127 extending horizontally in longitudinal direction at the upper and lower ends of the frame 105 of the machine. This rail 127 is engaged by a rack and pinion mechanism with a winding roller 132 disposed in an appropriate position on the frame 105 of the machine. As the rail 127 moves in the longitudinal direction, the roller 132 rotates so as to wind and unwind the second belt 126 which is

  connected at the front end to the crossbar 117.

  Consequently, with the vertical movement of the lifting members 122 and 123 driven by the normal and reverse rotation of the servomotor 121, the movement is transmitted to the bar 117 by the belts 125 and 126 and the rail 127 and the guide 118 has a reciprocating movement. parallel to the tree

rotary 109 of spindle 106.

  Next, as shown in FIGS. 5 and 6, a sensor (laser distance sensor) 133 which is characteristic of the present invention is mounted on the bar 117 by means of a cylindrical tab 134 and a plate support 135. The cylindrical tab 134 adapts to a specific position of the bar 117 and is fixed by a bolt 136. The support plate 135 is

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  supported at one end on the cylindrical tab 134 so that its surface is vertical and the other end of the support plate 135 extends on the side of the pin 106 and is slightly curved. The sensor 133 is attached by a bolt 137 to the curved end portion of the support plate 135, with its light-emitting part 138 and a light-receiving part 139 directed in the radial direction of the bobbin 102. When the laser light emitted 140 strikes the surface of the bobbin 102 (a layer of wire 141), the reflected light 142 is picked up by the photo-receiving part 139, thus detecting the distance from the picked-up position, or else the surface of the bobbin. The detected value thus obtained is entered into the controller 128 where the value is converted

into a diameter.

  In the present embodiment, a cover 143 of the sensor is provided which covers the sensor 133. The cover 143 is attached to the crossbar 117 by a cylindrical tab 144, separate from the cylindrical tab 134 of the sensor 133, covering the upper side and both sides

  of the sensor 133 as well as the support plate 135.

  Furthermore, a tab 145, which is branched in the direction of the width of the machine, is fixed to the end of the bar 117 on the shaft side, as shown in FIGS. 5 and 6, and the branched end part is attached by a bolt 146 to the vertical plate 119. On the vertical plate 119, a sliding block 147 having a recess is attached by a bolt 148. The second belt 126 is attached to this sliding block 147, which is guided up and down. bottom by guide rail 149 fixed in the recess. The guide rail 149 is installed by a bolt 151 on a plate 150 of the frame which constitutes the part

  extreme in the longitudinal direction of the frame 105 of the machine.

  The plate 150 is provided with a cover 152 to cover the end of the shaft side of the bar 117, and an opening 153 is provided in the vertical direction to allow a regular vertical movement of the bar 117. Furthermore, below the cover 152, a tab is mounted

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  support 154 for supporting the winding roller 132.

  The pin 106 is provided with a cover 155, which covers the upper side and both sides of the part driven by the belt 107 comprising the tension pulley 113. And a support rail 156 having a U-shaped section for supporting pin 106 is provided through the part

bottom of plate 150.

  The operation of this embodiment will be

explained below.

  Before unwinding the y y by the bobbin winder 101, the operator first establishes and introduces a type of yarn, a bobbin length, a bobbin shape, etc. in controller 128, from a touch control panel or the like. The controller 128 extracts the optimum operating program for the established conditions and starts the drive motor 108 and the servomotor 121. With the rotation of the drive motor 108, the belt 107 moves at a rapid speed, making it turn the pin 106 and consequently the coil body 102a. The rotational speed of spindle 106 is decreased, for example functionally, so that the coil body 121 rotates at a constant peripheral speed. The speed of rotation of the spindle 106 can also be controlled according to the diameter of the bobbin measured, by the sensor 133. The diameter of the wound part of a bobbin on which the yarn is wound and the profile of the layer of the yarn. at this time are entered according to the information concerning the diameter of the bobbin measured by the sensor 133 and the position of the guide 118 indicated by the rotation of the servomotor 121. The number of revolutions, the speed of rotation and the direction of rotation of the servomotor 121 are reapplied and controlled according to a program, thus actuating the guide 118 so that it has

  a back and forth movement over a specific width of back and forth

  back and forth and in a back and forth position to thereby form a bobbin, for example by winding at a fixed pitch.

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  The average of the predetermined number of values measured by the sensor 133 is averaged and this average value is used as a control value. This is done to eliminate the influence of vibrations from the back and forth guide, etc. As the sensor 133 for a non-contact measurement of the diameter of the bobbin 102 is installed on the bar 117 which rises and falls along the rotary shaft 109 of the spindle 106, the method of measuring the diameter of the bobbin in one position specific with a fixed sensor makes it possible to measure the diameter of the bobbin even in the case where the shape of the bobbin does not easily allow to see the diameter of a part of the bobbin which is surrounded by a thread y. The detected value is an axially balanced value, and therefore an appropriate value can be obtained without the effect of vibrations. In fact, in the bobbin winder 101 equipped with the servomotor 121 as an elevation drive mechanism, the formation of

  the bobbin with a programmed check.

  Furthermore, in this embodiment, while the cover 143 of the sensor is installed on the bar 117, it is possible to prevent any part from interfering with the sensor 133 which goes up and down. Furthermore, as the cylindrical tab 144 is installed separately, the measurement operation of the sensor 133 will not be adversely affected, even when the cover 143 of the sensor has moved. It should be noted that the sensor to be used is not limited to the laser distance sensor and that it is sufficient that it be of the contactless type; for example, we can use a

ultrasonic sensor.

  According to the above embodiment of the present invention, the excellent effect is obtained that the diameter of a

  coil of any shape can be well measured.

  According to the present invention, it is possible to produce a coil having a good desired shape of the winding, by directly determining the diameter of the coil.

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  during winding and by checking the winding conditions according to the thus determined diameter of the coil. There is no need to change the preset values if the wire type and wire speed have been changed as long as the desired spool shape remains the same. In addition, it becomes unnecessary to carry out a

  test winding to check the shape of the coil.

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Claims (6)

  1. Method for controlling the winding operation of a winder in order to form a reel by rotation of a   coil body, while giving a thread a movement of   back and forth in the axial direction of said coil body by means of a reciprocating member, characterized in that the diameter of the coil is directly detected and the   winding control according to the detection result.   2. Method according to claim 1, characterized in that   that the winding control includes the back and forth movement   comes from a back-and-forth organ and / or the control of the   speed of rotation of a coil body.   3. Method according to claim 1, characterized in that a sensor is provided for measuring the diameter of the coil, said sensor measuring the diameter of the coil in a position of a part of said coil on which a wire is wound and by performing the winding control according to the measurement result.   4. Device for controlling the winding operation of a winder, characterized in that, in a winder o a reel body is mounted on a rotary shaft for winding and to form a reel by winding a wire on said body coil while giving said wire a reciprocating movement in the axial direction of said coil body by a reciprocating member, said reciprocating member is provided with a sensor (133) for measuring the diameter of the   coil in order to perform the winding control.   5. Device according to claim 4, characterized in that a cover (143) is provided for the protection of said sensor, said cover being mounted on a member (117) which   is separated from the reciprocating organ.   6. Device according to claim 4, characterized in that it comprises a position sensor for detecting the position of the reciprocating member and a control means (128) for accomplishing the control of the winding in order to obtain 16 2712273   a desired shape of the coil based on the result of the detection by the position sensor and the   coil diameter detection.