Take-up winder

Abstract: The present invention relates to a take-up winder having a contact pressure control device to adjust the contact between a contact pressure roller and a package produced by winding a yarn to a bobbin set on a bobbin holder. The contact pressure control device of the take-up winder comprises a bobbin holder 5, a contact pressure roller 11 contacted against the bobbin B set on the bobbin holder 5, a slide supporting mechanism (s) for supporting the contact pressure roller 11 elevating or descending to the machine main body 2, and a contact pressure cylinder 13 freely adjusting the contact pressure of the contact pressure roller 11 and the bobbin holder 5. Moreover, a load cell 16 is provided directly below one contact pressure cylinder 13 located between a pair of slide supporting mechanismus (s), (s). Furthermore, a print circuit board for controlling is provided for controlling the contact pressure cylinder 13 based on the detected value of the load cell 16 so that the contact pressure is to be maintained at the designated value (Fig. 3.).

Description: The present invention relates to a take-up winder according to the preamble of claim 1 and a method for operation a take-up winder according to claim 5. A take-up winder of this type is known from DE-A-196 32 748. The arrangement of this take-up winder is such that among the occurring forces to maintain a predetermine supporting profile of the contact pressure roller as the weight of the roller supporting arm, the lifting force of the pressure cylinder, the contact pressure of the contact pressure roller and the bearing sliding resistance also the sliding resistance between the cylinder and the cylinder piston is included as an error effecting the supporting profile. Furthermore since bobbin holders on which a plurality of bobbins are inserted are normally supported in cantilever to the machine main body of the take-up winder vibrations due to high speed rotations of the bobbin holders influence the accuracy of the contact pressure control. The object underlying the present invention is therefore to enhance the accuracy of the contact pressure between the contact pressure roller and a bobbin. This object is solved by the features defined in the characterizing portion of claim 1. According to the method for operating a take-up winder as defined in claim 5 it is possible to keep the contact pressure within a target range. This method is also useful to determine whether an abnormal resistance may influence the contact pressure. Brief description of the Drawings Figure 1 is a sectional view of the relevant, part of a take-up winder. Figure 2 is a sectional view of the relevant part of the upper surface of the take-up winder. Figure 3 is a front view of the take-up winder. Figure 4 is a side view of the take-up winder. Figure 5 is a front view showing the turret section. Figure 6 is a block diagram showing the contact pressure control device. Figure 7 is a sectional view showing a different configuration of the contact pressure adjusting mechanism. Figure 8 is a partial diagrammatic view showing the load cell section of Figure 7. Figure 9 is a side view showing a different configuration of the contact pressure adjusting mechanism. Figure 10 is a partial diagrammatic view showing the load cell section of Figure 7. Figure 11 is a side view of the take-up winder showing a preferred embodiment of the present invention. Figure 12 is an enlarged front view of the relevant part of the take-up winder. Figure 13 is a circuit diagram of the diagnostic device. Figure 14 is a graph showing the load acting on the load cell when supplying air to the contact pressure cylinder. Figure 15 is a front view of the conventional take-up winder. Detailed Description of the Preferred Embodiments The embodiments of the present invention will be described in reference to the accompanying drawings. As shown in Figure 4 and Figure 5, a take-up winder 1 for winding a yam produced by a melt-spinning machine comprises a turret 4 rotating around the center shaft 3 to a machine main body 2, two bobbin holders 5, 6 projecting from the turret 4, induction motors 7, 8 for rotating and driving the bobbin holders 5, 6 fixed to the back of the turret 4, an elevating frame 10 elevating or descending perpendicularly by being guided by a guide rods 9 in the machine main body 2, a contact pressure roller 11 supported by the elevating frame 10, and a traverse device 12 supported by the elevating frame 10. The weight of the entire elevating frame 10 which supports the contact pressure roller 11 and the traverse device 12, is supported by a contact pressure cylinder 13 provided between the elevating frame 10 and the machine main body 2. The difference between this weight and the lifting force of the contact pressure cylinder 13 is the contact pressure to a package P of the contact pressure roller 11. In other words, the elevating frame 10 which supports the contact pressure roller 11 rotating and contacting the package P can elevate or descend to the machine main body 2 by the contact pressure cylinder 13. The contact pressure cylinder 13 adjusts the contact pressure applied to the package P. The entire elevating frame 10 is capable of elevating according to the increase in the winding diameter of the package P formed by yam wound to a bobbin B, while maintaining the contact pressure at a designated value. By increasing the air pressure to the contact pressure cylinder 13, the entire elevating frame 10 can be elevated by being separated from the package P. The schematic operation of such take-up winder is as follows. Referring to Figure 5, the bobbin holder 5 is located at a winding position approximately vertically above the center shaft 3. The bobbin holder 6 is located at a standby position approximately vertically below the center shaft 3. When the package P at the winding position becomes full wound, the turret 4 rotates 180 degrees, the full wound package P is located at a standby position, and an empty bobbin B reaches the winding position. A yam Y contacts to the empty bobbin B is transferred from the package P to the bobbin B. Next, the rotation of the bobbin holder 6 at the standby position is stopped, the package P is pushed out to a doffing cart (not shown), and an empty bobbin B is set on the bobbin holder 6 at the same time. By the repetition of such operation, the yarn Y is wound continuously. The bobbin holders 5, 6 are rotating bodies supported in a cantilever. Furthermore, the bobbin holders 5, 6 hold packages P of considerable weight, and a designated contact pressure is applied via the contact pressure roller 11. Therefore, a bearing 14 of the turret 4 supporting the bobbin holders 5, 6 rotatable, is provided on the front side of the machine main body 2. The guide rods 9 and the contact pressure cylinder 13 are provided adjacent to and in front of the bearing 14. Referring to Figure 1 and Figure 2, the turret 4 is provided with a disk unit 21 of the bearing 14, a body section 22 of narrow diameter, and an attaching section 23 of the bobbin holders 5, 6. An inner ring 24 of the bearing 14 is inserted to the outer periphery of the disk unit 21, and an outer ring 25 of the bearing 14 is attached to the wall of the front side of the machine main body 2. The guide rods 9 are arranged in a standing condition between a base 26 and a pressing member 27 in the machine main body 2. The position of the guide rods 9 is next to the position of the bearing 14, along the body section 22, and a position not interfering with the connecting shafts 28, 29 of the spindle motors 7, 8. Referring to Figure 1, since the guide rods 9 are arranged in a standing condition in front of the front surface of the machine main body 2, the elevating frame 10 is separated from the front surface of the machine main body 2 and freely elevates or descends. Therefore, the height where the elevating frame 10 is provided can be lowered in the extent not to interfere with the bobbin holders 5, 6. Moreover, referring to Figure 2, since the guide rods 9 and the contact pressure cylinder 13 are provided in proximity in a row not to interfere with the connecting shaft 28 of the spindle motor 7, the machine width determined by the interval of the guide rods 9, 9 and the interval of the contact pressure cylinders 13, 13, is narrow. 31 is the rotating shaft of the turret 4, 32 is a pulley for the rotating shaft 31, 33 is a belt, 34 is a pulley, and 35 is a drive motor. 36 is a base where the machine main body 2 is to be placed. Referring to Figure 3, the take-up winder will be further described. The contact pressure roller 11, elevates only at the beginning of the winding (until the yam layer thickness reaches 20 mm), and elevates from a1 position to position a2. The position A of the bobbin holder 5 is fixed at this time. The doffing of the full wound package P is carried out during the beginning of the winding. When the doffing is completed, the turret 4 rotates in the clockwise direction, the bobbin holder 5 moves from the position A to the position C, and the contact pressure roller 11 also descends to position a3. Then the contact pressure roller 11 reaches a standstill position a3, and the winding diameter of the package P increases. Then, the turret 4 is rotated slightly, the full wound package P is located at b2 position capable of being doffed, and the contact pressure roller 11 is elevated to a state in which the yam Y can be threaded to an empty bobbin B set on the bobbin holder 6. Next, the adjusting control of the contact pressure to the package P by the contact pressure cylinder 13 will be described. The take-up winder 1 comprises a contact pressure control device S for stabilizing the winding condition of the yam Y by maintaining the contact pressure applied to the package P (hereafter referred to as "winding contact pressure") at a designated value despite the change in the increase of the winding diameter of the package P. In other words, the contact pressure control device S connects a piston rod 13a of each contact pressure cylinder 13 and the base 26 of the machine main body 2 side via a load cell forming a pressure detecting means 16, and carries out a feedback control for maintaining the detected value of each load cells 16, 16 within a setting range. The contact pressure control device S illustrated in Figure 6 comprises an electromagnetic control valve 17 for controlling the air supply to the contact pressure cylinder 13, an air pump 18 freely supplying compressed air, a control circuit 19, an adjuster 20 for setting the winding contact pressure, an indicator 30 for displaying the pressure set in the adjuster 20 or the detected actual pressure, an amplifier 37 for amplifying the signal from the load cell 16, and A/D converter 38 for converting an analog signal from the amplifier 37 into a digital signal and then transmitting to the control circuit 19. The control circuit 19, the amplifier 37, and A/D converter 38 are formed into a print circuit board 39 for controlling the contact pressure adjusting mechanism based on the detected value of the pressure detecting means. The adjuster 20 sets the winding contact pressure which is to be the target, and it is programmed in that when the target value is set, the upper limit and the lower limit are determined automatically with the target value as the center value. For example, when the target value is to be M and the value between ±3% of the target value M is a setting range H, it is controlled to be 0.97M≤H≤1.03M. Even when the diameter of the package P is changes due to the increase in the winding diameter, the winding contact pressure is maintained within the setting range. Moreover, although it is not illustrated, the adjuster 20 is formed of an upper limit setting switch and a lower limit setting switch, and it is possible to directly set the setting range H by operating both of these switches. When: L :contact pressure of the contact pressure roller 11 W1 :weight of the elevating frame 10 W2 :total weight of the piston 13p and the piston rod 13a F1 :the lifting force of the contact pressure cylinder 13 F2 :the load acting on the load cell 16, L=W1-F1 F2=F1+W2, and L=W1+W2-F2 The value of W1+W2 is fixed beforehand, and when the contact pressure roller 11 is separated to the upper part from the package P of the bobbin B by extending the pistons 13a, 13b of the contact pressure cylinder 13 at maximum level, in other words, when L=0, F2=W1+W2 That is, by extending the pistons 13a, 13b of the contact pressure cylinder 13 to the stroke end, despite the winding status of the package P or the presence or the absence of the package P, according to the equation (2), the detected value of the load cell 16 is to be theoretically W1+W2. Therefore, by comparing the detected value of the load cell 16 when working the contact pressure cylinder 13 to the stroke end, and W1+W2, the zero-point correction of the load cell 16 can be carried out. In other words, an adjusting means (not shown) of the load cell 16 is to be operated so that the detected value of the load cell 16 equals W1+W2. Further, by providing a control valve 17 per each contact pressure cylinder and providing a means for setting the change in the admeasurement of the compressed air to these control valves 17, when there is a margin of error in the detected value of a pair of the load cells 16, to correct the margin of error, the pressure to the pair of the contact pressure cylinders 13, can be adjusted, and the control to correct the elevation strain of the elevating frame 10 can be carried out. Figure 7 and Figure 8 show an embodiment of a take-up winder 1 of a structure with only one contact pressure cylinder 13. A bridge frame 40 crossing over a pair of frame members 15 provided, and a single contact pressure cylinder 13 is extends over the bridge frame 40 and the elevating frame 10. The single contact pressure cylinder 13 is provided between a pair of the slide supporting mechanisms (S), and the lower edge section of the piston rod 13a is provided to contact the load cell 16 placed on a bearer 41 attached by a bolt to the bridge frame 40. Plumbing to the contact pressure cylinder 13 is formed by connecting a supplying and discharging pipe 44 of the compressed air via an elbow 43 to the piston 13p from downward. Further, a partition plate 42 avoids the interference of the load cell and the elbow 43, and is fixed to the bearer 41 by a screw. Since only one load cell 16 is provided and comparing to the case in which using two load cells, the whole structure can be formed at a low cost. Moreover, a means for processing two detected values, such as a means for averaging, becomes unnecessary, and the contact pressure control device S can be simplified to this extent. As shown in Figure 7 by the imaginary line, the load cell 16 can be provided between the cylinder main body 13A of the contact pressure cylinder 13, and the elevating frame 10. In such case as well, under the condition the contact pressure cylinder 13 is acted to the stroke end of either forward or backward, the total weight of the elevating frame 10 acts on the load cell 16 and accordingly the zero-point correction can be carried out. Figure 9 shows a take-up winder of a structure wherein one or a plurality of the contact pressure cylinders 63 is provided between a rotating frame 60 which holds a contact pressure roller 61 rotatable, and a machine main body 52. The take up-winder 51 comprises a turret 54 rotating around the center shaft 53 of a machine main body 52, two bobbin holders 55, 56 projecting from the turret 54, and induction motor (not shown) fixed to the back of the turret 54 for rotating and driving the bobbin holders 55, 56, the rotating frame 60 supported at a fulcrum 52a of the machine main body 52 and revolving vertically, a contact pressure roller 61 supported by the rotating frame 60, and a traverse device 62 supported by the rotating frame 60. The traverse device 62 is constructed of a rotary blade traverse device which transfers and traverses yam between the wings rotating in the opposite direction to one another, and is provided directly above the contact pressure roller 61. The rotating frame 60 comprises a roller supporting means for supporting the contact pressure roller 61. The weight of the entire rotating frame 60 which supports the contact pressure roller 61 and the traverse device 62, is supported by the contact pressure cylinder 63 provided between the fulcrum 52a of the rotating frame 60 and the contact pressure roller 61, and the machine main body 52. The difference of this weight and the lifting force of the contact pressure cylinder 63 is made to be the contact pressure applied to the package P of the contact pressure roller 61. The rotating frame 60 which supports the contact pressure roller 61 rotating and contacting the package P, is made rotatable to the machine main body 52 by the contact pressure cylinder 63. The contact pressure applied to the package P is adjusted by the contact pressure cylinder 63. According to the increase in the winding diameter of the package P to be formed around the bobbin B, the turret 54 rotates gradually in the clockwise direction in the example illustrated, and the contact pressure point of the contact pressure roller 61 and the package P is maintained at an approximately fixed position. That is, the contact pressure roller 61 rotates with the bobbin B while the entire rotating frame 60 is maintaining the designated contact pressure. The take-up winder 51 comprises a contact pressure control device S for stabilizing the winding condition of yam Y by maintaining the contact pressure applied to the package P at a designated value despite the change in the winding diameter of the package P. The contact pressure control device S connects the cylinder 63a of the contact pressure cylinder 63 and the machine main body 52 via the load cell 66, and carries out a feedback control for maintaining the detected value of the load cell 66 within a setting range. As shown in Figure 10, the contact pressure control device S connects a pair of electromagnetic air supplying valve 67a and electromagnetic air releasing valve 67b for controlling the pressure of the air to be supplied to the contact pressure cylinder 63, to an air source 68. The contact pressure control device S outputs the opening and closing order of the air supplying valve 67a and the air releasing valve 67b from a control circuit 69. The air supplying valve 67a and the air releasing valve 67b are connected in parallel to the contact pressure cylinder 63, and are also connected in parallel to the air source 68. The air supplying valve 67a is connected directly to the air source 68 to form a high pressure line, and the air releasing valve 67b forms a low pressure line via pressure reducer 97. On the contact pressure cylinder 63 side of the air supplying valve 67a and the air releasing valve 67b, squeezes 95a, are provided respectively, and a common air tank 96 is connected. As in the same manner with the embodiment described above, the air supplying valve 67a opens when the pressure decreases, and the air releasing valve 67b opens when the pressure increases, and the air supplying pressure of the contact pressure cylinder 63 is controlled the settle to the winding contact pressure within a designated range. The other operations of the take-up winder 51 are same as described with reference to Figure 1 through Figure 6. Referring to Figure 9, since the structure of the rotating frame 60 of the take-up winder 51 is provided with the contact pressure cylinder 63 between the contact pressure roller 61 and the fulcrum 52a, the load acting on the contact pressure cylinder 63 amplifies according to the length ratio from the fulcrum 52a. Moreover, since the contact pressure cylinder 63 is located away from the contact pressure roller 61 or the traverse device 62 which are vibrations sources, the rotating frame 60 is less subject to the influence of vibrations. Therefore, also minute changes of the load of the contact pressure cylinder 63 can be detected by the load cell 66. Next, a method for diagnosing with the pressure detecting means, whether or not the elevation or descending of the roller supporting means is carried out smoothly, will be described. As shown in Figure 15, a take-up winder for winding a yam produced by a melt-spinning machine 140 holds a plurality of bobbins 142 on a bobbin holder 141, and a contact roller 143 pressed down with a designated pressure onto the bobbin 142, a yam (not shown) is wound while sandwiched between the bobbin 142 and the contact roller 143. The contact roller 143 is supported rotatably on the roller supporting means 144 supported slidingly in the vertical direction. The roller supporting means 144 elevates according to the increase in the winding diameter. A contact pressure cylinder 145 optimizes the contact pressure acting on the bobbin 142. Then, by winding the yam while applying the most appropriate contact pressure to the contact roller 143, the yarn can be wound in a consistent designated form. Since the diameter of a package increases gradually by the winding yam to the bobbin 142, the contact roller 143 is to follow the change in the diameter of the package at all times so that the contact pressure is not changed. However, there were problems in that when wastes such as dust get stacked in the abrading system of such as a slide bearing (not shown) for guiding the slide box 144, a bearing ball (not shown) can break, or the oil runs out, the smoothness of the roller supporting means 144 is lost and the follow up of the contact roller 143 is worsenend. To accomplish aforementioned problem, the load acting upon the contact pressure cylinder is measured respectively while supplying air to the contact pressure cylinder for fixing the contact pressure of the package and the contact roller, or while releasing air from the contact pressure cylinder, and it is diagnosed whether or not there is an abnormal resistance in the elevation or descending of the roller supporting means of the contact roller according to whether or not the load is within a tolerance range. A diagnosis can be carried out easily at any time if during the take-up winder is stopping, and it can be judged easily whether or not there is an abnormality in the elevation or descending of the slide box. The abnormality in the elevation or descending of the roller supporting means can be easily found with a simple structure. As shown in Figure 11 and Figure 12, a take-up winder 101 comprises a bobbin holder 103 for holding a plurality of bobbins 102, and a contact pressure device 104 for applying a designated contact pressure to the bobbin 102 which is in the process of winding a yarn. Two bobbin holders 103 are provided in the outer periphery section of a turret 106 supported rotatably on a take-up winder main body 105, to project horizontally. One bobbin holder 103 which holds a full package 107 is moved to a position capable of being doffed. The other bobbin holder 103 which holds an empty bobbin 102 moves to a position for winding a yam. The contact pressure device 104 comprises a plurality of guide rods 108 provided upright on the take-up winder main body 105, a roller supporting means 110 provided in a guide rod 108 via a slide bearing 109 which is capable of sliding in the vertical direction, a contact roller 111 supported rotatable by the roller supporting means 110 which for applying the contact pressure to the bobbin 102 on the bobbin holder 103, and a contact pressure cylinder 113 for achieving a designated contact pressure. The contact pressure device 104 extends to the upper part from the take-up winder main body 105 and supports the roller supporting means 110 from below, which elevates according to the increase of the winding diameter of the package P. As shown in Figure 12 and 13, the contact pressure cylinder 13 is a single air cylinder, which determines the contact pressure by the air being supplied from an air pressure circuit 114. The air pressure circuit 114 comprises an air supplying path 115 extending from an air source 125 to the contact pressure cylinder 113, electromagnetic control valves 116, 117 provided in the air supplying path, capable of opening and closing the air supplying path 115, a tank 118 provided in the downstream side of the electromagnetic control valves 116, 117, an air releasing path 119 for releasing air from the contact pressure cylinder 113 connected to the air supplying path 115 branched off from the downstream side of the tank 118, a pressure reducer 120 provided in the air releasing path 119, and an electromagnetic control valve for reducing pressure 121 provided in the air releasing path 119 and opening and closing the air releasing path 119 at the upstream side of the pressure reducer 120. The electromagnetic magnetic control valves 116, 117 comprises an electromagnetic control valve for high speed supplying 116 and an electromagnetic control valve for low speed supplying 117. The electromagnetic control valve for high speed supplying 116 opens the air supplying path 115 all the way when elevating the air pressure inside the contact pressure cylinder 113 promptly. The electromagnetic control valve for low speed supplying 117 is provided in parallel to the electromagnetic control valve for high speed supplying 116, and is used during a contact pressure control. An orifice 135 is provided in the electromagnetic control valve for high speed supplying 116 and a supply line for low speed 134, and the quantity passed is squeezed. The generation of hunting is prevented by closing the electromagnetic control valve for high speed supplying 116 during the contact pressure control, and switching control the electromagnetic control valve for low speed supplying 117. Moreover, the contact pressure device 104 comprises a diagnostic device 136 for diagnosing whether or not the elevation or descending of the roller supporting means 110 is carried out smoothly. The diagnostic device 136 comprises a pressure detecting means 137 provided in the contact pressure cylinder 113 for measuring the load acting upon the contact pressure cylinder 113, a control unit 122 connected to the pressure detecting means 137 for judging whether or not the detected value of the pressure detecting means 137 is within a designated tolerance level, and an indicator 123 connected to the control unit 122 for displaying the judged result output from the control unit 122. The pressure detecting means 137 is a load cell 112, and is provided between the contact pressure cylinder 113 and the take-up winder main body 15. When the contact roller 111 is separated from the bobbin 102 and stands still, the pressure detecting means 137 detects the weight of the contact roller 111, the roller supporting means 110 and the contact pressure cylinder 113. The control unit 122 is also connected to the electromagnetic control valves for supplying 116, 117 or the electromagnetic control valve for reducing pressure 121. The feedback control to stabilize the contact pressure by the contact roller 111 is carried out by operating the electromagnetic control valve for low speed supplying 117 during winding. The target contact pressure and the weight of the members (not shown) attached to the roller support means 110 are input beforehand in the control unit 122, and an adjuster 24 for carrying out various manual operations is connected thereon. The effects will be described next. As shown in Figure 12, the package P on the bobbin holder 103 located at a designated winding position, winds the yam while applying a designated contact pressure to the contact roller 111 and after winding the yarn on the package P the control roller 111 is in a non-contacting state. By receiving a force directed upwardly from the contact pressure cylinder 113, the contact roller 111 elevates like continuing to apply the designated contact pressure to the package P following the increase in the winding diameter of the package P. The contact pressure cylinder 113 carries out a feedback control based on the load measured by the load cell 112. The feedback control is carried out by controlling the opening and closing of the electromagnetic control valve for low speed supplying 117 and the electromagnetic control valve for reducing pressure 121 by keeping the measured value measured by the load cell 112 within a designated target range. The target range is figured out by subtracting the range of the target contact pressure from the weight acting upon the load cell when no contact pressure is applied to the package P. When a yarn breakage occurs and the winding is interrupted, the diagnosis of whether or not the elevating and descending of the roller supporting means 110 is carried out smoothly is started automatically by utilizing the time until next yam threading. During the diagnosis, it is checked whether or not the load acting upon the load cell 112 is within a designated tolerance level. As shown in Figure 13 and Figure 14, the load F applied to the load cell 112 is read accordingly by supplying air at a low speed to the contact pressure cylinder 13 by opening the electromagnetic control valve for low speed supplying 117. When supplying air to the contact pressure cylinder 113 from the state where the roller supporting means 110 is located in the lower edge, the load F acting upon the load cell 112, in other words, the measured value of the load cell, increases gradually. When the roller supporting means 110 starts moving and starts departing from the lower edge, the load F acting upon the load cell 112 elevates to a designated value with the abrading resistance Fr added to the weight of the roller supporting means 110 and the contact pressure cylinder 113, and the value is fixed until changes occur in abrading resistance Fr. Then, as shown by a dotted line in Figure 14, when the measured value of the load cell 112 exceeds the limit value (tolerance level) set beforehand, before the contact pressure cylinder 113 reaches the upper end, the control unit 122 displays on the indicator 123 the report of the fact that there is an abnormal resistance in the elevation or descending of the roller supporting means 110, along with the measured value. In such case, since the possibility of some resistance acting upon the elevation of the roller supporting means 110 is large, the contact pressure device 104 is checked in a detail. Specifically, the following aspects are checked for example, and whether or not a packing (not shown) which seals the space between the slide box 110 and the guide rod 108 is deformed or a waste such as dust is stacked therein, whether or not waste is stacked in the slide bearing 109, whether or not a ball (not shown) of the slide bearing 109 is broken, whether or not a lubricant has run out in the abrading section of the roller supporting means 110 and the guide rod 108, and whether or not there is an abnormality in the abrading section of the contact pressure cylinder 113. Then, when there is an abnormality, operations such as repair or exchanging are effected. Moreover, when the piston rod of the contact pressure cylinder 113 extends to the end without passing the limit value, the control unit 112 displays on the indicator 123a report that there is no abnormality, the air is released from the contact pressure cylinder 113 which is then returned to the original position, and returns to a state capable of winding. As in the manner stated above, the load acting upon the contact pressure cylinder 113 is measured repetitively while supplying air to the contact pressure cylinder 113 or while releasing air from the contact pressure cylinder 113 for fixing the contact pressure of the package P and the contact roller 111. According to whether or not the measured load is within a tolerance range, it is checked whether or not there is an abnormal resistance in the elevation or descending of the roller supporting means 110 which supports the contact roller 111. Therefore, it can be checked easily in a short period of time whether or not the elevation or descending of the roller supporting means 110 is carried out normally. As a result, defaults such as a defective package P formed due to the abnormal elevation or descending of the roller supporting means 110, or falling apart of the package P apart during winding can be prevented from occurring. The diagnostic device 136 comprises the pressure detecting means 137 for measuring the load acting upon the contact pressure cylinder 113, and the control unit connected to the pressure detecting means 137 for judging whether or not the measured value of the pressure measuring means 137 is within the designated tolerance level. Therefore, the abnormality in the elevation or descending of the slide box 110 can be easily found with a simple structure. Further, the diagnostic device 136 starts operating automatically when a yam breakage occurs, however, it is not to be limited to such condition. For example, the diagnostic device 136 can be operated by hand by switching the mode from running mode to maintenance mode by the adjuster 124. In such case, after the slide box 110 is lowered to the lower edge position by opening the electromagnetic control valve for reducing pressure 121, the piston rod of the contact pressure cylinder 113 is extended gradually at a designated low speed by opening the electromagnetic control valve for slow speed supplying 117, and the reading of the load by the load cell 112 is started. The diagnostic device 136 can check whether or not there is an abnormality in the elevation or descending of the roller supporting means 110 easily at a short time. Moreover, the load acting upon the load cell 112 is measured repetitively while supplying air to the contact pressure roller 113 (while elevating roller supporting means 112). However, the load acting upon the load cell 112 can also be measured repetitively while releasing air from the contact pressure cylinder 113 (while descending the roller supporting means 110). The load acting upon the contact pressure cylinder 113 can be measured repetitively while supplying air to the contact pressure cylinder 113 or releasing air therefrom. However, the measurement must not to be carried out repetitively.

Claims: A take-up winder comprising: a bobbin holder (5); a contact pressure roller (11) pressed against a bobbin set on the bobbin holder; a roller supporting means (9, 10) for supporting the contact pressure roller (11) movably in relation to the bobbin; a fluid pressure cylinder (13) for adjusting the contact pressure between the contact pressure roller and the bobbin wherein the fluid pressure cylinder is bridged vertically between a machine main body (2), which supports the bobbin holder rotatably, and the roller supporting means (9, 10); and a pressure detecting means for detecting the pressure acting on the pressure cylinder (13), characterized in that the pressure detecting means is a load cell (16) provided directly below the fluid pressure cylinder (13) between the fluid pressure cylinder (13) and the machine main body (2). A take-up winder according to claim 1, characterized in that the roller supporting means (9, 10) comprises an elevating frame (10) supporting the contact pressure roller (11) and being guided by at least one guide rod (9), and that at least one fluid pressure cylinder (13) is provided between the elevating frame (10) and the machine main body (2). A take-up winder according to claim 1, characterized in that the roller supporting means (60) is supported rotatably at a fulcrum (52a) of the machine main body (52). A take-up winder according to claim 1 characterized in that the roller supporting means (9, 10) comprises an elevating frame (10) supporting the contact pressure roller (11) and being guided by two guide rods (9), and that the fluid pressure cylinder (13) is provided between the elevating frame (10) and the machine main body (2, 15, 40). A method for operating a take-up winder according to one of the claims 1 to 4, characterized in that the pressure detected by the pressure detecting means is feedback controlled to be kept within a target range (H) by corresponding air supplying to and air releasing from the fluid pressure cylinder. Method according to claim 5 characterized in that during e.g. a yam breakage when the winding operation is interrupted the fluid pressure cylinder is activated to determine whether during ascending or descending of the roller supporting means an abnormal resistance occurs. Method according to claim 5 characterized in that it is determined whether the abnormal resistance is due to an abnormal abrading resistance (Fr.)

Inventors: TONE SHOICHI, TONE, SHOICHI
Applicants: MURATA MACHINERY LTD, MURATA KIKAI KABUSHIKI KAISHA
Application year: 2001
Main classification: B65H54
IPC codes: B65H54