JPH07278969A - Speed change device of spinning frame and speed change method - Google Patents

Abstract

PURPOSE:To control a lord loaded from a belt shifter to a flat belt to a small value in case of changing a speed change ratio irrespective of a rotation direction of a drive motor. CONSTITUTION:A stepped pulley 4 is fixed to a driving shaft 3a of a drive motor 3 and a stepped pulley 5 is fixed on one terminal of the driving shaft 2 in the opposite direction to that of the stepped pulley 4. An endless flat belt 6 is laid between two stepped pulleys 4 and 5. A pair of belt shifters 7, 7 are arranged on both sides each of which corresponds to a loose side and a tension side of the flat belt 6 during driving the drive motor 3. Each lever 11 having a pair of guide rollers 8 capable of engaging with the flat belt 6 is rockingly attached to each of the belt shifters 7, 7 and each lever 11 is rockingly driven by a motor 9. Each motor 9 is controlled its drive by a controller, which is so installed as, at first, to start the belt shifter 7 to be the loose side during a rotation corresponding to a rotation direction of the drive motor 3 and, then, the shifter 7 of the tension side after the flat belt 6 begins to shift.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spinning machine such as a spinning machine and a twisting machine, which is mounted on a pair of step pulleys provided between a drive motor and a driving shaft (spindle drive shaft) for driving a spindle. The present invention relates to a speed change device and a speed change method for a spinning machine, in which the position where a flat belt is hung is changed by a belt shifter to shift the spinning machine.

[0002]

2. Description of the Related Art Generally, in a spinning machine such as a spinning machine and a twisting machine, a spindle is rotated at a high speed at a substantially constant speed during a normal spinning operation. During a certain period, or during a period from a constant high-speed rotation until the machine is stopped, low / medium-speed operation is performed for a certain period of time. For example, in Japanese Unexamined Patent Publication No. 61-201028, the rotation speed control of a spindle is performed by using a shift motor as a drive motor for the spindle and performing inverter control of the shift motor. However, it is difficult to cover a wide range of the rotational speed of the spindle only by controlling the rotational speed of the variable speed motor.
Therefore, flat belts that transmit power between the driving shaft that drives the spindle (hereinafter referred to as the spindle drive shaft) and the speed change motor are attached to the pair of step pulleys that are attached to the drive shaft of the speed change motor and the spindle drive shaft, respectively. The number of rotations of the spindle is changed by hanging the flat belt and changing the hanging position of the flat belt with respect to the step pulley. And with the inverter control of the variable speed motor,
By changing the mounting position of the flat belt to the step pulley, a wide range of rotation speed of the spindle is covered.

A belt shifter is provided as a means for changing the hanging position of the flat belt and the step pulley. As shown in FIG. 8, a stage pulley 32 having three mounted surfaces having different turning radii is attached to a drive shaft 31a of a spindle drive motor (hereinafter, simply referred to as a drive motor) 31, and a spindle drive shaft 33 A step pulley 34 having the same shape as the step pulley 32 is attached to the step pulley 32 in the opposite direction. A flat belt 35 is mounted between the two-stage pulleys 32 and 34, and the rotational force of the motor 31 is a gear ratio corresponding to the radius ratio of the mounted surface of each stage pulley 32, 34 on which the flat belt 35 is mounted. Spindle drive shaft 3 via a flat belt 35 that is shifted by
3 is transmitted.

The belt shifter 36 has a flat belt 3 at its lower end.
5 and the flat belt 35
It is equipped with two guide rollers 37 that face each other by sandwiching
The guide roller 37 includes the flat belt 35 and the step pulleys 32, 34.
It is installed at a position where it can be engaged at approximately the center thereof. The belt shifter 36 can be swung by a driving device (not shown) such as a motor or a cylinder.

When changing the rotation ratio between the drive motor 31 and the spindle drive shaft 33, the belt shifter 36 is swung by the driving device, and the guide roller 37 is swung along with the swing.
Pushes the rotating flat belt 35 in the side direction and slides it. Then, the two-stage pulleys 32, 3 of the flat belt 35
The rotation position of the spindle drive shaft 33 is changed by changing the hanging position with respect to No. 4 and changing the radius ratio of the hooked surfaces of the step pulleys 32, 34 on which the flat belt 35 is hooked.

By the way, the belt shifter 36 is the flat belt 3
5 is activated during operation of the rotating machine base. During rotation, the flat belt 35 is rotationally driven based on the rotational force of the drive-side step pulley 32, so that the side fed from the step pulley 32 is slack and the side taken in by the step pulley 32 is in tension. When the belt shifter 36 is engaged with the side where the flat belt 35 is stretched to change the position where the flat belt 35 is hooked, a large force is required to slide it because sliding friction with the step pulleys 32 and 34 is large on the stretched side. Need. As a result, the flat belt 35 is bent at its end portion due to the pressing force received from the belt shifter 36, or is worn relatively early to shorten the life of the flat belt 35.

On the other hand, since the sliding friction with the step pulleys 32, 34 is relatively small on the slack side of the flat belt 35, the belt shifter 36 is engaged with the slack side of the flat belt 35 so that the flat belt 35 is mounted on the slack side. When changing the position of the flat belt 35, the mounted position of the flat belt 35 can be changed with a relatively light force. As a result, the load applied to the flat belt 35 is small and wear is reduced, and the flat belt 35 can be used for a long time. As shown in FIG. 9, the force required to change the hanging position of the flat belt can be lightened in the order of a, c, b and d when the drive side step pulley 32 rotates in the A direction. .
Therefore, the belt shifter 36 is arranged at a position corresponding to the slack side of the flat belt 35 so that the guide roller 37 can be engaged with the flat belt 35 from the vicinity of the center thereof toward the position a.

[0008]

However, in the case where the spinning machine is a dual-purpose machine for spinning S-twisted yarn and Z-twisted yarn having different twisting directions of the yarn, the rotation direction of the drive motor 31 varies depending on the twisting direction of the yarn. It goes in the opposite direction. As a result, due to the change in the rotation direction of the drive motor due to the change in the twisting direction of the yarn,
The positions of the flat belt 35 on the tension side and the slack side are exchanged with each other. As shown in FIG. 9, the force required to change the hanging position of the flat belt 35 differs depending on the rotation direction of the drive motor 31, and when the drive side step pulley 32 rotates in the A direction, a, Lightening is possible in the order of c, b, d, and when the step pulley 32 rotates in the B direction, lightening is possible in the order of d, b, c, a. Therefore, as described above, the belt shifter 36
When the guide roller 37 is arranged so that it can be engaged with the flat belt from the vicinity of the center thereof toward the position a, when the side corresponding to the belt shifter 36 of the flat belt 35 is the tension side depending on the twisting direction of the yarn to be produced. When the belt shifter 36 is operated, bending and premature wear of the flat belt 35 become a problem.

In particular, when the machine base is a long machine having a relatively long machine length with a large number of weights, a large drive motor is used, and the flat belt 35 and the step pulleys 32, 34 are also relatively correspondingly. Wide or large diameter is used for. As a result, the sliding friction between the flat belt 35 and the step pulleys 32, 34 is further increased, and the load applied from the belt shifter 36 to the tight side of the flat belt 35 at the time of shifting is further increased. Further, the end of the flat belt 35 is more worried about bending and early wear.

Therefore, in the case of the S / Z twisting yarn dual-use machine, the belt shifter 36 is removed and the belt shifter 36 is set to the flat belt every time the rotation direction of the drive motor 31 is changed in accordance with the change in the twisting direction of the produced yarn. 35 is changed to correspond to the slack side. As a result, the work of changing the installation position of the belt shifter 36 was very troublesome.

The present invention has been made to solve the above-mentioned problems, and its object is also to provide a spinning machine in which the rotational direction of the drive motor is changed and the positional relationship between the slack side and the tension side of the flat belt is switched. It is an object of the present invention to provide a transmission device and a transmission method for a spinning machine, which can reduce the load on the flat belt when the belt shifter operates.

[0012]

In order to solve the above-mentioned problems, in the invention according to claim 1, a step pulley attached to a drive shaft of a drive motor of a spinning machine and a step pulley attached to a driven shaft. A flat belt is hung between the pulley and the flat belt with respect to the hooked surface of each step pulley on at least both sides corresponding to the tension side and the slack side when the flat belt rotates. A belt shifter for changing the hanging position of is installed.

According to a second aspect of the present invention, there is provided drive control means for starting the belt shifter on the side corresponding to the tension side of the flat belt before the belt shifter on the side corresponding to the slack side of the flat belt. .

According to the third aspect of the invention, with respect to the flat belt mounted between the step pulley attached to the drive shaft of the drive motor of the spinning machine and the step pulley attached to the driven shaft, hand,
A plurality of belt shifters engageable on the tension side and the slack side of the flat belt at least when the drive motor is driven are provided on both sides of the flat belt and the slack side. At the time of changing the position of the belt with respect to the step pulley, the belt shifter is operated so that the belt shifter at the same time or at least the slack side first engages with the flat belt, and the position of the flat belt with respect to the step pulleys is applied. Is changed to change the rotational speed of the driven shaft.

[0015]

According to the invention of the first aspect, the rotation of the step pulley attached to the drive shaft when the drive motor of the spinning machine is driven is attached to the driven shaft via the flat belt. Is transmitted to the stepped pulley. At this time, the flat belt is slackened on the sending side from the step pulley attached to the drive shaft of the drive motor, and is in a tension state on the side fed to the step pulley attached to the drive shaft of the drive motor. Since the belt shifters are arranged on both sides of the flat belt, the flat belt is always pressed by the engagement with either one of the belt shifters on the slack side where sliding friction with the step pulley is relatively small at the time of shifting, and Due to the pressure, the mounting position of the flat belt is smoothly changed with a relatively weak force. Therefore, the flat belt does not receive a large load from the belt shifter when the hanging position is changed.
As a result, bending and premature wear of the flat belt due to the load received from the belt shift can be suppressed.

According to the second aspect of the present invention, when changing the hanging position of the flat belt, the drive control means first starts the belt shifter on the side corresponding to the tension side of the flat belt.
After that, the side corresponding to the slack side of the flat belt is started.
As a result, the flat belt is pressed first on the slack side and then on the tension side during gear shifting. By pressing the slack side first, the shift of the flat belt starts from the side where the sliding friction with the step pulley is relatively small. After the shift is started, the flat belt is pressed from the tension side, but the belt shifter on the tension side engages with and pushes the flat belt that is already moving, so that the flat belt moves with a comparatively light force.
Therefore, the load on the tension side of the flat belt can be small. Further, the load applied to the flat belt is dispersed by being pressed by the belt shift on the tension side, and the wear of the flat belt is further suppressed.

According to the third aspect of the invention, even when the rotation direction of the drive motor is changed, the flat belt is disposed on both sides of the slack side and the tension side when the hanging position of the flat belt is changed. The belt shifter is actuated such that the belt shifter at the same time or at least on the slack side first engages the flat belt. As a result, the flat belt always starts moving in the shift direction based on the pressing force pressed by the belt shifter installed on the slack side. When the slack side of the flat belt is pressed, the flat belt is smoothly repositioned with a small force due to relatively small sliding friction. Therefore, since the load applied from the belt shifter to the flat belt is relatively small, bending and early wear of the end portion of the flat belt due to the engagement with the belt shifter can be suppressed.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a transmission of a spinning machine will be described below with reference to FIGS.

As shown in FIG. 4, a driving shaft 2 is rotatably supported at the center of the spinning frame 1 in a state of extending along the longitudinal direction of the frame. At the gear end 1a of the machine base 1, a drive motor 3 for driving a spindle is arranged so that its drive shaft 3a is parallel to the driving shaft 2. On the drive shaft 3a of the drive motor 3, a step pulley 4 having two mounted surfaces 4a and 4b having different radii of rotation on its outer peripheral surface is attached. A step pulley 5 having the same shape as the step pulley 4 and having two mounted surfaces 5a and 5b is attached to the end of the driving shaft 2 opposite to the step pulley 4. Double-stage pulley 4,
Reference numeral 5 denotes the mounted surfaces 4a, 4b, 5 having different radii of rotation.
a and 5b are in a corresponding positional relationship. An endless flat belt 6 is hung between the two-stage pulleys 4 and 5 via the hung surfaces 4a and 5a (or 4b and 5b).

As shown in FIG. 1, a pair of belt shifters 7 and 7 facing each other with the flat belt 6 sandwiched therebetween are arranged on both sides corresponding to the outer peripheral surface of the flat belt 6 hung between the step pulleys 4 and 5. It is set up. The belt shifters 7 and 7 are arranged such that a pair of guide rollers 8 spaced apart from the width of the flat belt 6 are sandwiched between the guide rollers 8 in the width direction. In each belt shifter 7, 7, each guide roller 8 is a step pulley 4, 5
It is installed at a position where it can be engaged near the step pulley 5 of the flat belt 6 hung between them. Here, since the belt shifters 7 and 7 have substantially the same corresponding member structures, only the belt shifter 7 on the left side of FIG. 1 will be described in the present embodiment.

As shown in FIGS. 1 and 2, a motor 9 is disposed on one side of the main body 7a of the belt shifter 7, and the motor 9
Are controlled by the control device 10 shown in FIG. In addition, a lever 11 having a substantially T-shaped plate is provided on the front surface of the main body 7a so as to be swingable around a rotation shaft 11a. The lever 11 swings at a predetermined speed around the rotary shaft 11a when the driving force of the motor 9 is reduced by a gear mechanism or a belt mechanism (not shown) provided in the main body 7a. The guide roller 8 is rotatably supported by a pair of support shafts 12 provided upright on the tip of a lever 11 orthogonal to the surface thereof.

As the lever 11 swings, the flat belt 6 positioned between the guide rollers 8 is guided by the guide rollers 8 and the covered surfaces 4 of the step pulleys 4 and 5 are guided.
The mounting position is changed by sliding between a, 4b, 5a and 5b.

As shown in FIGS. 2 and 3, a pair of limit switches 13 and 14 are arranged on the bottom surface (lower side of FIG. 2) of the main body 7a at predetermined intervals. The limit switches 13 and 14 are connected to the control device 10. The limit switches 13 and 14 are arranged at positions where the detection portions 13a and 14a can engage with the detected member 15 fixed to the back surface of the lever 11. When one of the limit switches 13 and 14 is engaged with the detected member 15 and turned on by the swing of the lever 11, the driving of the motor 9 is stopped. By restricting the movement amount of the lever 11 in this way, the guide roller 8 can guide the flat belt 6 to the positions corresponding to the mounted surfaces 4a, 4b, 5a, 5b.

The drive motor 3 is drive-controlled by the control device 10 shown in FIG. The drive motor 3 is a forward / reverse variable speed motor, and its rotation speed is drive-controlled via an inverter (not shown). The twisting direction of the production yarn can be set to either the S twisting yarn or the Z twisting yarn by an input device (not shown). When the S twisting yarn is input and set, the drive motor 3 is rotationally driven in the direction of arrow A in FIG. When the Z twisted yarn is input and set, the drive motor 3 is rotationally driven in the direction of arrow B in FIG.

Further, the control device 10 has a microcomputer (not shown) built therein so that the spindle rotation speed draws a predetermined speed locus during the spinning operation of the machine base 1 by a predetermined program stored in the microcomputer. Is set to. The belt shifters 7 and 7 are at the time when the spindle speed reaches a predetermined speed (medium speed) from the start of the machine base and when the spindle speed reaches a predetermined speed (medium speed) from the predetermined high speed spinning operation in the machine stop process. Drive control is performed by the control device 10. When the belt shifters 7 and 7 are driven, the belt shifter 7 installed on the slack side of the flat belt 6 is always driven first according to the rotation direction of the drive motor 3, and after a predetermined time, the flat belt 6 moves. Driving of the belt shifter 7 on the tension side is started. The deviation of the starting timing of both belt shifters 7 is caused as soon as the flat belt 6 starts sliding on the mounted surfaces 4a, 4b, 5a, 5b by the start of the belt shifter 7 installed on the loose side of the flat belt 6. The belt shifter 7 installed on the tight side of 6 is set to be started. In addition, the spindle is shown in FIG.
As shown in FIG. 5, the driving shaft 16 is driven to rotate at a high speed through a tape mounted on a driving pulley 16 fitted on the driving shaft 2 at predetermined intervals.

Next, the operation of the speed change device of the spinning machine configured as described above will be described. Prior to the start of machine operation, the twisting direction of the production yarn is input to the control device 10 by the input device, and either the S twisting yarn or the Z twisting yarn is input and set. When the machine is stopped, the flat belt 6 is
5 as shown by the solid line in FIGS.
It is hung between b and 5b.

For example, when the twisting direction of the produced yarn is set to the S twisting yarn, the drive motor 3 is rotationally driven in the direction of arrow A in FIG. The driving force of the drive motor 3 is transmitted to the driving shaft 2 via the flat belt 6, and the driving shaft 2 is attached to the mounted surface 4
It is driven at a rotation ratio according to the radius ratio of b and 5b. The drive motor 3 is drive-controlled through an inverter based on a program set in the microcomputer so that the spindle rotation speed draws a predetermined speed locus. When producing the S twisted yarn in which the drive motor 3 is rotated in the direction of the arrow A, the flat belt 6 is fed from the step pulley 4 and the right side of FIG.
The left side of FIG. 1 fed into the step pulley 4 is in a tensioned state.

When the spindle rotation speed reaches a predetermined speed (medium speed) after the operation of the machine base, the control device 10 drives the belt shifters 7, 7. That is, first, the belt shifter 7 on the right side (upper side in FIG. 5) of FIG. 1 installed on the slack side of the flat belt 6.
Is started and the lever 11 is swung in the direction of the arrow in FIG. Then, when the guide roller 8 engages with the flat belt 6 and the flat belt 6 starts to move as the lever 11 moves, the other side of the other side of FIG. The belt shifter 7 (below 5) is started.

During this gear shifting, the flat belt 6 has the step pulleys 4, 5
Since the sliding friction between and is pressed first from the slack side, the movement starts smoothly with a relatively small force.
As a result, the load that the flat belt 6 initially receives from the guide roller 8 is relatively small, and the end portion of the flat belt 6 is not bent at the engaging portion with the guide roller 8. Further, the lever 11 of the belt shifter 7 installed on the tension side of the flat belt 6 engages with and pushes the moving flat belt 6, and together with the lever 11 of the belt shifter 7 started earlier, the flat belt 6 comes from both sides. Since the flat belt 6 is pressed, the load applied from the guide roller 8 to the flat belt 6 is small even on the tight side of the flat belt 6. During the movement, the flat belt 6 is pressed from both sides by the guide rollers 8 by the belt shifters 7 on both the slack side and the tension side, so that the load applied to the flat belt 6 is dispersed to both sides. .
As a result, the contact area with the flat belt 6 increases, but the force applied to the flat belt 6 per unit area decreases, so that the flat belt 6 wears due to sliding with the guide roller 8 due to the contact pressure reducing effect. The speed can be kept low.

Then, the detected member 15 fixed to the back surface of the lever 11 is mounted on the limit switch 1 at the swing destination.
When 3 is contacted and turned on, the controller 10 stops driving the motor 9. As a result, the lever 11 stops at the position where the guide roller 8 can regulate the flat belt 6 at the position corresponding to the hooked surfaces 4a and 5a. In this way, the hanging position of the flat belt 6 is changed from the hanging surfaces 4b, 5b to the hanging surfaces 4a, 5a, and the rotation ratio between the drive motor 3 and the driving shaft 2 is changed. At this time, the rotation speed of the drive motor 3 is appropriately decelerated so that the spindle rotation speed is controlled so as to draw a smooth velocity locus.

After that, when the spindle rotation speed rises along a predetermined speed locus and reaches a predetermined high speed rotation speed, the drive motor 3 is driven at that rotation speed and the S-twisted yarn is produced. Then, when the pipe is full, the spindle rotation speed is lowered so as to draw a predetermined velocity locus. Then, when a predetermined number of rotations (medium speed) is reached during the downward movement, the control device 10 again starts driving the belt shifters 7, 7, and the belt shifter 7 is installed on the slack side of the flat belt 6 in the same manner as described above. The flat belt 6 is started first, and then the side installed on the tight side of the flat belt 6 is started. Then, the flat belt 6 is moved from the hooked surfaces 4a, 5a to positions corresponding to the hooked surfaces 4b, 5b by the lever 11 moving in the direction opposite to the arrow direction in FIG. Then, the detected member 15 fixed to the back surface of the lever 11 is the detection unit 14 a of the limit switch 14.
Press to turn it on and lever 1 at that position
1 is stopped and the movement of the flat belt 6 is completed. On this occasion,
The rotation speed of the drive motor 3 is appropriately accelerated and the spindle rotation speed is controlled so as to draw a smooth velocity locus. After that, the spindle rotation speed descends along a predetermined speed locus, the driving of the drive motor 3 is stopped, and the operation of the machine base 1 is stopped.

On the other hand, when Z-twisted yarn is produced, the drive motor 3 is rotationally driven in the direction of arrow B in FIG. When the Z-twisted yarn in which the drive motor 3 is rotated in the direction of the arrow B is produced, the flat belt 6
1 is slackened on the left side in FIG. 1 fed from the stepped pulley 4 and stretched on the right side in FIG. 1 fed to the stepped pulley 4.

When the spindle rotation speed reaches a predetermined speed (medium speed) after the operation of the machine base, the belt shifters 7, 7 are driven by the control device 10, and the left side of FIG. The belt shifter 7 (on the lower side of FIG. 5) is started. Then, when the flat belt 6 is guided by the guide roller 8 and starts to move due to the swing of the lever 11 accompanying the start thereof, immediately after that, the right side of the other side of FIG. The belt shifter 7 (upper side of 5) is started.

During this speed change, the flat belt 6 moves the step pulleys 4, 5
The sliding friction between the first roller and the flat belt 6 is pressed first from the slack side and starts to move smoothly with a relatively small force, so that the load applied from the guide roller 8 to the flat belt 6 is relatively small. As a result, the end portion of the flat belt 6 does not bend at the engaging portion with the guide roller 8 when the flat belt 6 starts to slide. Further, since the flat belt 6 is pressed against the guide roller 8 from both the slack side and the tight side by the belt shifter 7 which is moved after the flat belt 6 starts sliding, the force received by the flat belt 6 from the guide roller 8 is dispersed. It As a result, the contact pressure between the guide roller 8 and the end portion of the flat belt 6 is reduced, and the abrasion speed of the flat belt 6 due to the sliding friction with the guide roller 8 can be suppressed low. Thus, the hanging position of the flat belt 6 is changed from the hanging surfaces 4b, 5b to the hanging surfaces 4a, 5a.
And the rotation ratio between the drive motor 3 and the driving shaft 2 is changed. At this time, the rotation speed of the drive motor 3 is appropriately decelerated so that the spindle rotation speed is controlled so as to draw a smooth velocity locus.

Further, when the spindle rotation speed is lowered after the pipe is full and reaches a predetermined rotation speed (medium speed) in the middle, the belt shifters 7, 7 are driven again by the control device 10, and the belt shifter 7 is moved in the same manner as described above. The side installed on the loose side of the flat belt 6 is started first, and then the side installed on the tight side of the flat belt 6 is started. The lever 11 moving in the direction opposite to the arrow in FIG.
a, 5a to a position corresponding to the hooked surfaces 4b, 5b, the hooking position of the flat belt 6 is changed from the hooked surfaces 4b, 5b to the hooked surfaces 4a, 5a, and the drive motor 3 and The rotation ratio between the driving shafts 2 is changed. On this occasion,
The rotation speed of the drive motor 3 is appropriately accelerated and the spindle rotation speed is controlled so as to draw a smooth velocity locus.

As described in detail above, in the transmission of the spinning machine of this embodiment, the rotational direction of the drive motor 3 is reversed depending on whether the production yarn is the S twist yarn or the Z twist yarn, and the slack side of the flat belt 6 is driven. The tension side position is reversed. However, the belt shifter 7 installed on the slack side of the flat belt 6 is always started first when the hanging position of the flat belt 6 is changed, and immediately after the start, the belt shifter 7 installed on the tension side of the flat belt 6 is started. It is started. As a result, the sliding friction between the flat belt 6 and the step pulleys 4 and 5 is first pushed from the side where the slack is relatively small, so that the flat belt 6 starts sliding smoothly with a relatively small force, and the flat belt 6 starts to slide. Sometimes the load received from the guide roller 8 is relatively small. for that reason,
It is possible to prevent the end portion of the flat belt 6 from bending at the engaging portion with the guide roller 8.

Further, by starting the belt shifter 7 installed on the tight side of the flat belt 6 with the starting timing shifted,
After the flat belt 6 starts to slide, the flat belt 6 is pressed by the guide rollers 8 from both the loose side and the tight side, so that the load applied from the guide rollers 8 to the flat belt 6 can be dispersed. Therefore, the contact pressure that the flat belt 6 receives from the guide roller 8 is reduced, so that the guide roller 8
The wear rate of the end portion of the flat belt 6 due to the contact with the flat belt 6 can be kept low. As a result, the flat belt 6 is bent and the wear rate of the end portion of the flat belt 6 is reduced, so that the flat belt 6
The life of can be extended. Then, the number of times the flat belt 6 is replaced can be reduced, so that the time and labor required for the replacement can be saved. Further, since the service life of the flat belt 6 is extended, the cost of the flat belt 6 is reduced accordingly.

Further, since the guide roller 8 of the belt shifter 7 on the tension side of the flat belt 6 engages with the moving flat belt 6 from the beginning, it comes into contact with the stationary flat belt 6 to start sliding it. It requires less force than it does. Therefore, even if the tension side of the flat belt 6 is pressed, the load applied to the flat belt 6 can be small. As a result, the flat belt 6 is slid with a comparatively light force even on the tension side where the sliding friction with the step pulleys 4 and 5 is large, and therefore the flat belt 6 is also guided by the guide roller 8 of the tension side belt shifter 7. It is possible to prevent the ends of the sheet from being bent or prematurely worn.

Even if the spinning machine is a long stand having a large number of spindles for both S and Z twisted yarns, it is possible to prevent the flat belt 6 from bending and prematurely wearing. Further, according to the transmission of the present embodiment, it is not necessary to replace the belt shifter 7, and it is possible to save the time and labor for replacing the position of the belt shifter 7 each time the rotation direction of the drive motor 3 is changed. You can

Further, since the belt shifters 7, 7 are installed between the step pulleys 4, 5 on the side of the step pulley 5 on the driven side, the belt shifter 7 which is started before pressing the slack side of the flat belt 6 to the flat belt 6 It is possible to keep the load on the user very small.

The present invention is not limited to the above embodiments, but may be configured as follows, for example, without departing from the spirit of the invention. (1) The combination of the arrangement positions of the belt shifters 7, 7 can be set appropriately. For example, in FIG. 6, the pair of belt shifters 7, 7 may be arranged so that the guide roller 8 is arranged at the combination position (c, b). Further, the pair of belt shifters 7, 7 may be arranged and set together in the vicinity of the center of the flat belt 6. In the case of the combination (c, b), in order to slide the flat belt 6 in FIG.
When position A rotates in the direction of arrow A, the position b on the tension side is light, and when position pulley 4 rotates in the direction of the arrow B, position c on the tension side is light. In addition, the combination (c,
Not limited to b), when the installation position of the belt shifters 7, 7 is closer to the step pulley 4 on the drive side than the center between the step pulleys 4 and 5, the flat belt 6 can be shifted with a lighter force than before.

A particularly effective combination is that a pair of belt shifters 7, 7 are provided on both sides of the flat belt 6 on the slack side and the tension side, at the center position between the rotation centers of the step pulleys 4, 5 and the rotation of the step pulley 5. It is to be installed so that it can be engaged with the flat belt 6 in a range between the center and the center. In this case, the belt shifter 7 on the slack side does not matter whether the rotation direction of the drive motor 3 is forward or reverse.
Therefore, the load applied to the flat belt 6 can be sufficiently reduced. Further, all the above-described combined positions of the belt shifters 7, 7 can reduce the load applied to the flat belt 6 as compared with the conventional case.

(2) As shown in FIG. 7, a pair of guide rollers 17 may be provided on both sides in the thickness direction with the flat belt 6 sandwiched therebetween. In this case, even if the flat belt 6 is pressed by the guide roller 8 and is restrained by the guide rollers 17 and 17, the flat belt 6 is prevented from bending in the thickness direction. Therefore, for some reason (for example, wind that has entered between the step pulley and the flat belt). Even if the end portion of the flat belt 6 bends due to increase in friction due to cotton or the like), the occurrence of the bend can be reliably prevented.

(3) In the above embodiment, the belt shifters 7, 7
Although the start timings of 1 and 2 have been shifted, the belt shifters 7 and 7 may be started at the same time. Even in this case, since the slack side of the flat belt 6 is always pressed by the guide roller 8, the load applied from the guide roller 8 to the flat belt 6 can be reduced, and the flat belt 6 can be prevented from bending and premature wear.
Further, by rotating the levers 11 of the belt shifters 7 and 7 at the same speed in synchronization with each other, the flat belt 6 can be evenly shifted from both sides, so that the flat belt 6 is subjected to a force in the twisting direction. Can be prevented.

(4) Of the pair of belt shifters 7, 7, the belt shifter 7 on the tight side of the flat belt 6 is set in a free state,
The flat belt 6 may be configured to operate only the belt shifter 7 on the slack side. Also in this case, the load applied from the guide roller 8 to the flat belt 6 can be reduced, and the flat belt 6 can be prevented from bending and prematurely wearing.

(5) The drive-side step pulley does not necessarily need to be directly attached to the drive shaft of the motor, but is between the drive-side step pulley and the driven-side step pulley that are indirectly rotationally driven by the drive means. The present invention may be applied to a transmission having a configuration in which a flat belt is attached to the transmission.

(6) In the above embodiment, the guide roller 8 of the belt shifter 7 is of the swing type by the lever 11, but it may be of a moving type in which it slides parallel to the axial direction of the driving shaft 2. For example, if a hydraulic cylinder or an air cylinder is used, the guide roller 8 is attached to the driving shaft 2
It can be configured to be linearly movable in parallel with the axial direction of.

(7) The number of steps of the step pulleys 4 and 5 (that is, the number of mounted surfaces) is not limited to two steps. For example, the number of stages may be three, as in Japanese Patent Laid-Open No. 61-201028. Further, it may be a plurality of stages of three or more.

(8) In the above embodiment, one belt shifter 7 is provided on each of the slack side and the tension side of the flat belt 6, but a plurality of belt shifters 7 may be provided on any one side or both sides. Good.

(9) The present invention may be applied to spinning machines other than the spinning machine. For example, it may be applied to a twisting machine. (10) In FIG. 6, combinations (a, b) and (c, where the belt shifters 7, 7 are installed on one side of the flat belt 6)
The case of d) is also effective. That is, the force required to slide the flat belt 6 is light when the step pulley 4 rotates in the direction of the arrow A at the slack side a position and the tension side c position, respectively. When rotating in the direction of the arrow B, the b position on the tension side and the d position on the slack side can be light. This combination of installation positions is effective when there is a space for disposing the belt shifter 7 on only one side of the flat belt 6. Further, it is more effective to start the belt shifter 7 which requires a light force for sliding the flat belt 6 first.

The technical idea grasped from the above-mentioned embodiment and not described in the claims will be described below together with the effect thereof. (1) In claim 1, drive control means for simultaneously starting the belt shifter at the same speed is provided. According to this configuration, the flat belt can be moved evenly from both sides at the same timing, and the flat belt can be prevented from being subjected to a force in the twisting direction.

(2) In claim 1, there is provided drive control means for driving only the belt shifter on the side corresponding to the slack side of the flat belt when changing the rotation ratio between the drive motor and the driven shaft. Prepared With this configuration, the load applied to the flat belt by the belt shifter can be reduced.

(3) In claim 1, the belt shifter is arranged so as to be engageable with the flat belt between a center position between the step pulleys and a step pulley attached to a driven shaft. . With this configuration, the load applied from the belt shifter to the flat belt can be further reduced.

(4) In Claims 1 and 2, and the above-mentioned technical ideas (1) to (3), the belt shifter includes a first guide roller for guiding the flat belt in its width direction, and the flat belt. And a second guide roller that regulates the position in the thickness direction. With this configuration, it is possible to more reliably prevent the end portion of the flat belt from being bent by the second guide roller.

[0055]

As described in detail above, according to the invention described in claim 1, even in the spinning machine in which the rotational direction of the drive motor is changed and the positional relationship between the slack side and the tension side of the flat belt is switched, the flat belt is also changed. On the other hand, since the belt shifters are provided on both sides of the slack side and the tension side, an excellent effect that the load applied from the belt shifter to the flat belt at the time of operating the belt shifter can be suppressed is achieved.

According to the second and third aspects of the invention, since the belt shifter on the loose side of the flat belt is started before the belt shifter on the tight side of the flat belt, the flat belt is pressed from both sides. In addition, the load on the tension side can be suppressed to a small level, and the load applied to the flat belt is distributed to both sides, so that the wear of the flat belt can be further suppressed.

[Brief description of drawings]

FIG. 1 is a schematic front view of a transmission according to an embodiment of the present invention.

FIG. 2 is a schematic front view of a belt shifter.

FIG. 3 is a partial schematic bottom view of the belt shifter.

FIG. 4 is a partial schematic side view of the transmission.

FIG. 5 is a partially cutaway schematic plan view of the transmission.

FIG. 6 is a schematic side view showing an engagement positional relationship of a belt shifter with a flat belt.

FIG. 7 is a partial schematic bottom view of a belt shifter of another example.

FIG. 8 is a schematic side view of a transmission according to the related art.

FIG. 9 is a schematic side view showing an engagement positional relationship of a belt shifter with a flat belt according to a conventional technique.

[Explanation of symbols]

2 ... Driving shaft as driven shaft, 3 ... Drive motor, 3a ... Drive shaft, 4, 5 ... Stage pulley, 4a, 4
b, 5a, 5b ... Attached surface, 6 ... Flat belt, 7 ... Belt shifter, 10 ... Control device as drive control means.

Claims (3)

[Claims] 1. A flat belt is hung between a step pulley attached to a drive shaft of a drive motor of a spinning machine and a step pulley attached to a driven shaft, and is stretched at least when the flat belt rotates. On both sides corresponding to the part that becomes the side and the part that becomes the slack side,
A transmission device for a spinning machine, comprising a belt shifter for changing a hanging position of the flat belt with respect to a hanging surface of each step pulley. 2. The spinning machine according to claim 1, further comprising drive control means for starting the belt shifter on the side corresponding to the tension side of the flat belt before the belt shifter on the side corresponding to the slack side of the flat belt. Gearbox. 3. A flat belt mounted between a step pulley attached to a drive shaft of a drive motor of a spinning machine and a step pulley attached to a driven shaft, and at least the flat belt of the drive motor. A plurality of belt shifters engageable on the tension side and the slack side of the flat belt are arranged on both sides of the flat belt at the time of driving, and the belt shifter is provided with the step pulley of the flat belt. At the time of changing the hanging position with respect to, simultaneously or at least the slack side belt shifter is actuated so as to engage with the flat belt first, by changing the hanging position of the flat belt with respect to each step pulley A method for shifting a spinning machine that changes the rotational speed of a driven shaft.