JP2002145525A - Pressure-contact control device for yarn winder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a practical pressure-contact control device capable of controlling the feedback by improving a pressure detecting means and the location structure thereof. SOLUTION: This pressure-contact control device for a yarn winder is provided with a bobbin holder 5, a pressure-contact roller 11 to be brought in pressure-contact with a bobbin B fitted on the bobbin holder 5, a slide support mechanism (s) for supporting the pressure-contact roller 11 with a machine main body 2 freely to be slid for elevation and a pressure-contact cylinder 13 capable of adjusting the pressure-contact force between the pressure-contact roller 11 and the bobbin holder 5. A load cell 16 is provided just under the pressure-contact cylinder 13 arranged between a pair of slide support mechanism (s) and (s), and a control printed substrate for controlling the pressure-contact cylinder 13 on the basis of a detection value of the load cell 16 is provided to maintain the pressure-contact force at the predetermined value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact pressure control device for a spinning winder. More specifically, the present invention relates to feedback of contact pressure between a bobbin holder for winding a yarn and a contact pressure roller which rotates in conjunction with the bobbin holder. The present invention relates to a technique for accurately maintaining a predetermined value by control.

[0002]

2. Description of the Related Art In a yarn winding machine of this type, in a process of winding a yarn around a bobbin holder to form a package, the bobbin holder rotates at a high speed, and the quality of the yarn is improved by stable winding. Therefore, control for adjusting the contact pressure between the contact pressure roller and the package, that is, the contact pressure is required. As the contact pressure control device for that purpose, there are known winding devices disclosed in Japanese Patent Publication No. 7-55764 and Japanese Patent Application Laid-Open No. 8-26597.

In these devices, a pressure detecting means such as a strain sensor for detecting a load of a bearing portion rotatably supporting the pressure contact roller is provided, and the detected value of the pressure detecting means is fed back, so that the pressure contact roller is provided. A control structure for controlling the contact pressure to the package to a target value.

[0004]

The technique disclosed in the above publication is intended to maintain the contact pressure accurately at a target value (or target range) by performing a so-called feedback control. It is expected that these measures will not work as expected. That is, the bobbin holder in which the plurality of bobbin holders are loaded is cantilevered with respect to the machine body in order to facilitate replacement of the package,
In this state, high-speed rotation is performed, so that vibration accompanying rotation always occurs, and the load fluctuation of the contact pressure roller is intense. In addition to the necessity, some kind of processing means for treating both of these detected values as one data is necessary, so that control accuracy that can withstand use cannot be actually realized.

In order to solve this problem, it is conceivable that the detected values of the left and right pressure detecting means are matched with each other and no fluctuation occurs. However, there is room for improvement in realizing feedback control with good accuracy and practical use.

An object of the present invention is to obtain a contact pressure control device capable of performing feedback control that can withstand practical use by devising a pressure detecting means and an installation structure thereof.

[0007]

According to a first aspect of the present invention, there is provided a bobbin holder rotatably driven, a contact pressure roller which is pressed against a bobbin fitted in the bobbin holder and is rotatable in conjunction therewith, and
A spinning winder provided with roller support means for movably supporting the contact pressure roller with respect to the bobbin in the direction of contacting and separating from the bobbin, and a contact pressure adjusting mechanism capable of adjusting the contact pressure between the contact pressure roller and the bobbin holder. In the contact pressure control device, pressure detecting means for detecting a pressure acting on the contact pressure adjusting mechanism is provided, and the contact pressure adjusting mechanism is controlled based on the detected value of the pressure detecting means so that the contact pressure is maintained at a predetermined value. A means for controlling is provided.

According to the first aspect of the present invention, the pressure detecting means detects the pressure acting on the contact pressure adjusting mechanism (such as a pneumatic cylinder which supports the contact pressure roller so as to be able to move up and down). Is arranged closer to the base than the bearing portion of the contact pressure roller in the support means of the contact pressure roller, so that it is associated with the interlocking rotation in contact with the bobbin holder or the package as compared with the prior art. Vibration is attenuated, and the detection value is stabilized.

According to a second aspect of the present invention, in the configuration of the first aspect, the contact pressure adjusting mechanism is vertically installed over a machine main body rotatably supporting the bobbin holder and the roller supporting means. A fluid pressure cylinder, wherein the pressure detecting means is a load cell interposed between the fluid pressure cylinder and the machine main body immediately below the fluid pressure cylinder.

According to the second aspect of the present invention, the roller supporting means for supporting the contact pressure roller is configured to be received by the fluid pressure cylinder disposed vertically, and the load cell is disposed immediately below the fluid pressure cylinder. Because of the arrangement, relatively large loads of both the roller support means and the fluid pressure cylinder act on the load cell, so that the detected change can be clearly captured as compared with the case of detecting a small load change. become able to.

According to a third aspect of the present invention, in the configuration of the second aspect, the roller support means includes a movable frame rotatably supporting the contact pressure roller positioned above the bobbin holder, and a pair of slide support mechanisms. The hydraulic cylinder is slidably supported by the machine main body via the slide mechanism, and one hydraulic cylinder is disposed between the two slide support mechanisms.

According to the third aspect of the present invention, only one load cell is required to be disposed immediately below the fluid pressure cylinder. Therefore, it is possible to reduce the cost as compared with the case where two or more load cells are used. A means for processing a plurality of detected values as one control data, such as a means for averaging the detected values, becomes unnecessary.

According to a fourth aspect of the present invention, in the configuration of the second aspect, the roller support means pivotally moves a base end of a movable frame rotatably supporting the contact pressure roller positioned above the bobbin holder. The fluid pressure cylinder is disposed between the moving frame and the machine main body, and is supported by the machine main body.

According to the fourth aspect of the present invention, the short-stroke hydraulic cylinder is disposed between the base end of the moving frame and the contact pressure roller and between the main body of the machine and the hydraulic lever according to the principle of leverage. Compared with a case where a relatively large load is applied to the cylinder and a minute load change is detected, the detected change can be clearly captured.

According to a fifth aspect of the present invention, in the configuration of any of the second to fourth aspects, when the hydraulic cylinder is operated at one of the stroke ends of expansion and contraction, the entire weight of the lifting frame acts on the load cell. The amount of expansion and contraction movement of the fluid pressure cylinder is set.

According to the fifth aspect of the present invention, as will be described in detail in the embodiment, in the stroke end state, the weight of the entire lifting frame and the fluid The total weight with the weight of the pressure cylinder will act. Since the total weight is a constant value that has been clarified by measurement or the like in advance, the zero point of the load cell can be corrected by comparing the constant value with an actual detection value.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 4 and 5, the spinning winder 1 includes a turret 4 that rotates around a central axis 3 with respect to a machine main body 2, and two bobbin holders 5 and 6 that protrude from the turret 4. And induction motors 7, 8 fixed to the back surface of the turret 4 to rotate the bobbin holders 5, 6
A lifting frame 10 as a moving frame which is guided vertically by a guide column 9 in the machine body 2 and rises or falls; a contact pressure roller 11 supported by the lifting frame 10; And a traverse device 12.

The weight of the entire lifting frame 10 supporting the contact pressure roller 11 and the traverse device 12 is the weight of the lifting frame 10 and the machine body 2.
, And the difference between the weight and the lifting force of the contact pressure cylinder 13 is used as the contact pressure of the contact pressure roller 11 with respect to the package P. That is, the lifting frame 10 that supports the pressure roller 11 that comes into contact with the package P is
As a result, it is possible to move up and down with respect to the machine main body 2, and the contact pressure to the package P is adjusted by the contact pressure cylinder 13.

That is, the package P is wound around the bobbin B while keeping the entire lifting frame 10 at a predetermined contact pressure.
It is designed to be able to rise according to the thickness of the winding. or,
By increasing the air pressure with respect to the contact pressure cylinder 13, the entire lifting frame 10 can be lifted away from the package P. The guide support 9 constitutes a slide support mechanism s, and the guide support 9, the lifting frame 10 and the like constitute roller support means.

The general operation of this take-up winder is as follows. In FIG. 5, the bobbin holder 5 is located at a winding position substantially vertically above the central shaft 3, and the bobbin holder 6 is located at a standby position substantially vertically below the central shaft 3. When the package P at the winding position is fully wound, the turret 4 becomes 180
The full bobbin package P is turned to the standby position, and the empty bobbin B is switched to the winding position.

While the yarn Y is in contact with the empty bobbin B, the yarn Y is wound up by the full winding package P, and the yarn Y is transferred from the full winding package P to the bobbin B by a yarn transfer device (not shown). Next, the rotation of the bobbin holder 6 at the standby position is stopped, and the full package P is pushed out to a doffing car (not shown), and the empty bobbin B is inserted into the bobbin holder 6 at the same time. By repeating the above operation, the yarn Y is continuously wound.

The bobbin holders 5 and 6 are cantilevered rotating bodies, hold a package P of a substantial weight wound around the bobbin B, and receive a predetermined contact pressure through a contact pressure roller 10. Structure. For this reason, the bearing 14 for the turret 4 that rotatably supports the bobbin holders 5 and 6 is disposed as forward as possible of the machine main body 2, and as a result, the guide support 9 and the contact pressure cylinder 13 are provided.
Is provided on the side of the bearing 14 and shifted to the side opposite to the bobbin holder.

1 and 2, the turret 4 has a disk portion 21 for the bearing 14, a small-diameter body portion 22, and a mounting portion 23 for the bobbin holders 5, 6. The inner ring 24 of the bearing 14 is fitted on the outer periphery of the disk portion 21, and the outer ring 25 of the bearing 14 is attached to the front wall of the machine body 2.

A guide column 9 is provided upright between a pedestal 26 provided on the machine main body 2 and a holding member 27. The position of the guide column 9 is a position beside the bearing 14 and a position of the trunk 22. And the spindle motors 7, 8
This is a position where the width is reduced within a range that does not interfere with the rotation trajectories of the connecting shafts 28 and 29 from the position. That is, the degree of the small diameter of the body portion 22 may be within the rotation locus of the connecting shafts 28 and 29 (due to the rotation of the turret 4).

In FIG. 1, the guide column 9 is a main body 2 of the machine.
Is set up before the front wall of the
Is movable up and down while being separated from the front wall of the machine body 2. Therefore, the height of the portion where the elevating frame 10 is installed can be reduced to the extent that it does not interfere with the bobbin holders 5 and 6. In FIG. 2, the guide support 9 and the contact pressure cylinder 13 are arranged side by side so as not to interfere with the rotation locus of the connecting shaft 28 of the spindle motor 7 (due to the rotation of the turret 4). The width of the machine determined by the interval of 9 and the interval of the contact pressure cylinder 13 is reduced.

The positions of the bobbin holders 5 and 6 extend forward by the body portion 22 and the load on the bearing 14 increases.
Since there is no obstacle in the outer peripheral part of the bearing, a high-load bearing 14 can be selected and attached. for that reason,
An increase in load on the bearing 14 can be absorbed. Reference numeral 31 denotes a rotating shaft of the turret 4, 32 denotes a pulley with respect to the rotating shaft 31, 33 denotes a belt, 34 denotes a pulley, and 35 denotes a rotation driving motor, which can rotate the turret 4 to a predetermined position. Reference numeral 36 denotes a base on which the machine main body 2 is mounted.

Next, a description will be given, with reference to FIG. 3, of a spinning take-up machine which makes maximum use of the reduction of the machine height by the mechanism of the above-mentioned lifting frame guide. The contact pressure roller 11 is initially wound (with a yarn layer thickness of 2).
(To about 0 mm) and from the a1 position to the a2 position. At this time, the position A of the bobbin holder 5 is at the fixed position. During the initial winding, the full package P is doffed. After doffing, the turret 4 rotates clockwise, the bobbin holder 5 changes from the position A to the position C, and the contact pressure roller 11 also lowers to the position a3. Then, the position of the contact pressure roller 11 remains stopped at the position a3, and the thickening of the package P is released by the clockwise rotation of the turret 4. Finally, the full package P at the position b1 is doffed.

Then, the turret 4 is slightly rotated to bring the full-wrap package P to the b2 position where the doffing can be performed, and the contact pressure roller 11 is raised so that the thread can be transferred to the empty bobbin B inserted into the bobbin holder 6. State. Then, a series of operations of transferring the yarn from the full package P to the empty bobbin B and doffing the full package P is repeated to continuously wind the yarn Y.

As a method of releasing the turret 4 according to the winding thickness, a method is used in which the upper and lower limit positions of the contact pressure roller 11 are detected by a sensor, and the turret 4 is intermittently rotated so as to fall within a predetermined upper and lower limit position. Alternatively, there are a method of automatically calculating the winding diameter of the package P and automatically rotating the turret 4 and a method of automatically rotating the turret 4 with a predetermined function value over time.

Next, the control for adjusting the contact pressure on the package P by the contact pressure cylinder 13 will be described. In the present spinning winder 1, the contact pressure on the package P (hereinafter referred to as “winding contact pressure”) is maintained at a predetermined value irrespective of a change in the thickness of the package P, and the winding condition of the yarn Y is stabilized. And a contact pressure control device S for reducing the pressure. That is, the contact pressure control device S controls the piston rod 1 of the contact pressure cylinder 13.
3a and a pedestal 26 on the machine body 2 side are connected via a load cell (an example of pressure detecting means) 16 to perform feedback control for maintaining the detected value of each load cell 16, 16 within a set range. It is.

The contact pressure control device S shown in FIG. 6 includes an electromagnetic control valve 17 for supplying air to the contact pressure cylinder 13, an air pump 18 capable of supplying compressed air, a control circuit 19, and a winding contact pressure. A setting device 20 to be set, a display device 3 for displaying the pressure set by the setting device 20, the actual pressure detected, and the like.
0, an amplifier 37 for amplifying a signal from the load cell 16,
An A / D converter 38 for converting an analog signal from the amplifier 37 into a digital signal and transmitting the digital signal to the control circuit 19 is provided. The control circuit 19, the amplifier 37, and the A / D converter 38 are a control printed circuit board (an example of a means for controlling the contact pressure adjusting mechanism based on the detected value of the pressure detecting means) 39
Are integrally formed.

The setting unit 20 sets a target winding contact pressure. When a target value is set, a program is set so that an upper limit value and a lower limit value centered on the target value are automatically determined. Have been. For example, if the target value is M, ± 3%
Is a setting range H, 0.97M ≦ H ≦ 1.03
M is controlled. Due to this feedback control, even if the diameter of the package P changes due to thickening of the winding, the winding contact pressure is maintained within a set range following the change. Although not shown, the upper limit setting switch and the lower limit setting switch may constitute the setting unit 20, and the setting range H may be directly set by operating both switches.

Here, L: contact pressure of contact pressure roller 11 W1: weight of lifting frame 10 W2: total weight of piston 13p and piston rod 13a F1: thrust (lifting force) of contact pressure cylinder 13 F2: load cell 16 Assuming that the load acts (see FIG. 4), L = W1-F1 F2 = F1 + W2, and L = W1 + W2-F2 (1). Since the value of W1 + W2 is a predetermined constant value, the contact pressure cylinder 13 is fully extended and the contact pressure roller 1
When 1 is separated upward from the package P of the bobbin B, that is, when L = 0, F2 = W1 + W2 (2). That is, by extending the contact pressure cylinder 13 to the stroke end, the detection value of the load cell 16 is theoretically determined by the above equation (2) regardless of whether the package P is fully wound or not, regardless of the presence or absence of the package P. W1
+ W2.

Therefore, the zero point of the load cell 16 can be corrected by comparing the detected value of the load cell 16 when the contact pressure cylinder 13 is extended to the stroke end with W1 + W2. That is,
The adjusting means (not shown) of the load cell 16 is operated so that the detected value of the load cell 16 becomes W1 + W2.

By providing a control valve 17 for each of the contact pressure cylinders 13 and 13 and by providing means for changing and setting the distribution of compressed air to the control valves 17 and 17,
If there is an error in the detected values of the pair of load cells 16, 16, the pressure applied to the pair of contact pressure cylinders 13, 13 is adjusted so as to correct the error, and the lifting distortion of the lifting frame 10 is corrected. It is also possible to perform control.

[Alternative Embodiment] As shown in FIGS. 7 and 8,
Spinning winder 1 having a structure having only one contact pressure cylinder 13
The present invention may be applied to That is, a bridge frame 40 is provided so as to straddle the pair of frame members 15, 15, and a single contact pressure cylinder 13 is bridged between the bridge frame 40 and the lifting frame 10. The single contact pressure cylinder 13 is disposed between the pair of slide support mechanisms s, s,
The lower end portion of the piston rod 13a is arranged and configured so that the lower end of the piston rod 13a abuts on the load cell 16 mounted on the receiving base 41 bolted to the side surface of the bridge frame 40.

The piping to the pressure cylinder 13 is an elbow 43
The air supply / discharge pipe 44 for compressed air is connected to the hole of the piston 13p from below through the hole. That is, the pipe is provided to the piston 13p on the fixed position side. still,
Reference numeral 42 denotes a partition plate for avoiding interference between the load cell and the elbow 43, and is screwed to the receiving table 41.

In this case, only one load cell 16 is required, and the configuration can be made at a lower cost than when two load cells are used. Also, such as means for averaging,
There is an advantage that means for processing the two detected values is not required, and the contact pressure control device S can be simplified accordingly.

As shown by a virtual line in FIG. 7, a load cell 16 may be provided between the cylinder body 13A of the contact pressure cylinder 13 and the lifting frame 10. Even in this case, the entire weight of the lifting frame 10 can be applied to the load cell 16 in a state where the contact pressure cylinder 13 is operated at one of the expansion and contraction stroke ends, whereby the above-mentioned zero point correction can be performed. It is.

[Another Embodiment] As shown in FIG. 9, a turning frame 60 for rotatably holding a contact pressure roller 61 and a machine body 5 are provided.
The present invention may be applied to a spinning winder 51 having one or more contact pressure cylinders 63 between the two.

The take-up winder 51 includes a turret 54 rotating around a central axis 53 with respect to a machine main body 52, and two bobbin holders 55, 5 protruding from the turret 54.
6 and a bobbin holder 5 fixed to the back of the turret 54.
An induction motor (not shown) that rotationally drives the motors 5 and 56, a turning frame 60 supported by a fulcrum 52a of the machine main body 52 and turning vertically, a contact pressure roller 61 supported by the turning frame 60, and a turning frame 60. And a traverse device 62 supported by the traverse device 62. The traverse device 62 is a blade traverse device that transfers and traverses yarns between blades rotating in opposite directions, and is disposed right above the contact pressure roller 61. This turning frame 60 is used for the contact pressure roller 6.
A moving frame as roller supporting means for supporting the bobbin 1 movably in a direction in which the bobbin contacts and separates from the bobbin.

The weight of the entire turning frame 60 supporting the contact pressure roller 61 and the traverse device 62 is the contact weight provided between the supporting point 52a at the base end of the turning frame 10 and the contact pressure roller 61 and the machine body 52. It is supported by the pressure cylinder 63, and the difference between this weight and the lifting force of the contact pressure cylinder 63 is set as the contact pressure of the contact pressure roller 61 against the package P. That is, the contact pressure roller 6 that rolls on the package P
1 is rotatable relative to the machine body 52 by a contact pressure cylinder 63, and the contact pressure on the package P is adjusted by the contact pressure cylinder 63.

The turret 54 gradually rotates clockwise in the illustrated example in accordance with the thickness of the package P wound around the bobbin B, and the contact pressure roller 61 and the package P are rotated.
Is maintained at a substantially constant position. That is, the turning frame 6
0 while maintaining a predetermined contact pressure,
The contact pressure cylinder 63 has a short stroke as long as the contact pressure cylinder 63 can be turned in the direction of contacting and separating from the bobbin. The moving frame is constituted by the turning frame 60, and the roller supporting means r is constituted by the fulcrum 52a, the turning frame 60 and the like.

The spinning winder 51 maintains the contact pressure against the package P at a predetermined value irrespective of the change in the thickness of the package P, thereby stabilizing the winding state of the yarn Y. It has. That is, the contact pressure control device S connects the cylinder 63a of the contact pressure cylinder 63 and the machine body 52 via the load cell (an example of a pressure detecting unit) 66, and sets the detection value of the load cell 66 within the set range. This is to perform the feedback control to be maintained.

As shown in FIG. 10, the contact pressure control device S
A pair of electromagnetic air supply valve 67a and exhaust valve 67b for controlling the pressure of air supplied to the contact pressure cylinder 63
Is connected to an air source 68, and a control circuit 69 outputs a command to open and close the air supply valve 67a and the exhaust valve 67b. The air supply valve 67a and the exhaust valve 67b are connected in parallel to the contact pressure cylinder 63, and
8 is also connected in parallel. The air supply valve 67a is directly connected to the air source 68 to form a high pressure line, and the exhaust valve 67b forms a low pressure line via a pressure reducing valve 97. Further, throttles 95 are provided on the side of the contact pressure cylinder 63 of the supply valve 67a and the exhaust valve 67b, respectively.
a and 95b are provided, and a common air tank 96 is connected.

As in the above-described embodiment, when the pressure decreases, the air supply valve 67a opens, and when the pressure increases, the exhaust valve 67b opens, so that the target winding contact pressure falls within a predetermined range. The supply pressure to the contact pressure cylinder 63 is controlled. Other operations of the spinning winder 51 are the same as those described with reference to FIGS.

The revolving frame 60 of the take-up winder 51 shown in FIG. 9 has a structure in which the contact pressure cylinder 63 is provided between the contact pressure roller 61 at the front end and the fulcrum 52a at the base end. The load acting on the contact pressure cylinder 63 is amplified by the length ratio from 52a. Further, since the contact pressure cylinder 63 is located away from the contact pressure roller 61 and the traverse device 62 that is a vibration source, it is hardly affected by vibration. Therefore, a slight change in the load of the contact pressure cylinder 63 is detected by the load cell 66.

[0048]

As described above, in the contact pressure control device for the winding machine according to the first aspect, the pressure acting on the contact pressure adjusting mechanism is detected and fed back to stabilize the control data. Thus, even in a high-speed rotation and severe vibration state, feedback control with practically accurate accuracy can be performed.

In the contact pressure control device for the winding machine according to the second aspect, the above-described effect according to the first aspect is exhibited, and
The use condition suitable for a load cell suitable for detection of a relatively large load can be realized, and feedback control with excellent control accuracy can be performed at a relatively low cost.

According to the third aspect of the present invention, the contact pressure control device for a winder has the same advantages as those of the second aspect, and
There is an advantage that only one load cell as the pressure detecting means is required, and the structure as the control device can be simplified and the cost can be reduced.

In the contact pressure control device for the winding machine according to the fourth aspect, the above-described effect according to the second aspect is exhibited, and
There is an advantage that a large output can be taken out from the load cell as the pressure detecting means.

In the contact pressure control device for the winder according to the fifth aspect, the zero point of the load cell can be corrected for further improving the control accuracy, and the zero point can be corrected in the fluid cell. There is the convenience obtained by a simple operation of operating the pressure cylinder at any of the stroke ends of expansion and contraction.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a spinning winder.

FIG. 2 is a cross-sectional view of a main part of the upper surface of the spinning winder.

FIG. 3 is a front view of the spinning winder.

FIG. 4 is a side view of the spinning winder.

FIG. 5 is a front view showing a turret portion.

FIG. 6 is a block diagram showing a contact pressure control device.

FIG. 7 is a side view showing another structure of the contact pressure adjusting mechanism.

FIG. 8 is a partial view showing a load cell part of FIG. 7;

FIG. 9 is a side view showing another structure of the contact pressure adjusting mechanism.

FIG. 10 is a partial view showing a load cell part of FIG. 7;

[Explanation of symbols]

 2,52 Machine body 5,55 Bobbin holder 10,60 Elevating frame 11,61 Contact pressure roller 13,63 Contact pressure adjustment mechanism 16,66 Pressure detection means 39 Means for controlling contact pressure adjustment mechanism r Roller support means s Slide support mechanism B bobbin

Claims (5)

[Claims] 1. A bobbin holder, a contact pressure roller pressed against a bobbin fitted in the bobbin holder, and a roller supporting means for movably supporting the contact pressure roller in a direction of coming into contact with and separating from the bobbin. And a contact pressure control device of the spinning winder provided with a contact pressure adjusting mechanism capable of adjusting a contact pressure between the contact pressure roller and the bobbin holder, wherein a pressure acting on the contact pressure adjusting mechanism is detected. A contact pressure control of a spinning winder, comprising a pressure detecting means, and a means for controlling the contact pressure adjusting mechanism based on a detected value of the pressure detecting means so that the contact pressure is maintained at a predetermined value. apparatus. 2. The contact pressure adjusting mechanism is a fluid pressure cylinder vertically mounted over a machine main body rotatably supporting the bobbin holder and the roller supporting means, and the pressure detecting means is The contact pressure control device for a spinning winder according to claim 1, wherein the contact pressure control device is a load cell interposed between the hydraulic cylinder and the machine main body immediately below the hydraulic cylinder. 3. The machine body in which the roller supporting means rotatably supports the contact pressure roller positioned above the bobbin holder via a pair of slide support mechanisms. 3. The contact pressure control device for a spinning winder according to claim 2, wherein one fluid pressure cylinder is disposed between the two slide support mechanisms. 4. 4. The apparatus according to claim 1, wherein the roller supporting means rotatably supports a base end of a movable frame rotatably supporting the contact pressure roller positioned above the bobbin holder, on the machine body. The contact pressure control device for a spinning winder according to claim 2, wherein the fluid pressure cylinder is disposed between a frame and the machine main body. 5. The expansion and contraction movement amount of the hydraulic cylinder is set such that the total weight of the lifting frame acts on the load cell when the hydraulic cylinder is operated at one of the expansion and contraction stroke ends. A contact pressure control device for a spinning winder according to claim 2.