JP4872788B2 - Bobbin rail lifting device in roving machine - Google Patents

Description

  The present invention relates to a bobbin rail lifting device in a roving machine, and more particularly to a bobbin rail lifting device in a roving machine that lifts and lowers a bobbin rail by a drive motor capable of torque control.

In general, a roving machine is provided with a bobbin rail lifting device that lifts and lowers a bobbin rail.
The bobbin rail elevating device is provided with an elevating mechanism such as a rack and pinion gear, and the bobbin rail elevating with respect to the machine base via the elevating mechanism is raised and lowered by the elevating motor.
In a conventional roving machine, the bobbin rail is raised and lowered during normal spinning, and the bobbin rail is raised and lowered when the full bobbin is replaced with an empty bobbin.
In the case of a roving machine in which a flyer is provided with a downward spindle, it is necessary to raise the bobbin rail on which the empty bobbin is placed and insert the spindle into the empty bobbin when replacing the bobbin.
At this time, if the empty bobbin is not installed at a proper position on the bobbin rail, the spindle collides with the empty bobbin.
If the bobbin rail rises in a state where the empty bobbin collides with the spindle, the lifting mechanism in the bobbin rail lifting device may be damaged.

Therefore, conventionally, for example, a bobbin insertion abnormality is detected by the technique disclosed in Patent Document 1.
In this technology, detection devices such as photoelectric devices and ultrasonic sensors are provided so that light and ultrasonic waves travel along the longitudinal direction of the bobbin rail along the side of the bobbin that is normally inserted on the bobbin wheel of the bobbin rail. ing.
According to this technique, after the bobbin is inserted on the bobbin wheel, the bobbin wheel is rotated at least once, and the bobbin inserted into the bobbin wheel in a tilted state is detected by the detection device.
JP-A-60-65128 (page 1-3, FIG. 1-5)

However, the conventional technique detects a bobbin insertion error with respect to the bobbin wheel before inserting it into the spindle, and requires a detection device such as a photoelectric device or an ultrasonic sensor.
Further, in the conventional technology, for example, if the detection device fails, it is impossible to detect an abnormality, and the bobbin rail is raised without detecting the abnormality, so that the spindle and the bobbin collide.
It is unavoidable that the lifting mechanism such as the rack and the pinion gear included in the bobbin rail lifting device is damaged by the lifting of the bobbin rail even after the collision between the two.
Further, a roving machine that cannot be provided with a detecting device cannot detect an abnormality when the bobbin rail is moved up and down.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a bobbin in a roughing spinning machine that can avoid damage to the lifting mechanism even if an abnormality such as a collision occurs when the bobbin rail is lifted or lowered. To provide a rail lifting device.

  In order to achieve the above object, the present invention provides a bobbin in a roving machine having a bobbin rail that moves up and down via a lifting mechanism, a lifting motor that lifts and lowers the bobbin rail, and a control means that drives and controls the lifting motor. In the rail lifting device, the control means uses a low torque limit value set lower than a high torque limit value of the lifting motor at the time of spinning, for lifting and lowering at the time of lifting and lowering of the bobbin rail other than at the spinning time. It has a function of setting as a limit value of the output torque of the motor.

In the present invention, when the bobbin rail is moved up and down other than during spinning, the limit value of the output torque of the lifting motor is set to the low torque limit value by the control means.
Since the low torque limit value is a torque set lower than the high torque limit value of the lifting motor at the time of spinning, it is assumed that a collision between the spindle and the bobbin occurs and the torque reaches the low torque limit value. Even if this occurs, the lifting motor cannot output any more torque, so the lifting motor slips and the bobbin rail stops moving up and down.
In this way, when a torque reaching the low torque limit value is generated, the bobbin rail lifting is stopped, and the lifting mechanism is less likely to be damaged. Further, at the time of spinning, a high torque limit value higher than the low torque limit value is set as a limit value of the output torque in response to an increase in the weight of the roving yarn accompanying winding and an impact load when the bobbin rail is reversed. Therefore, it does not interfere with spinning. In the present invention, “at the time of spinning” refers to from the start to the end of winding of the roving around the bobbin.

  Further, the present invention provides the bobbin rail lifting device in the above-described roving machine, wherein the bobbin rail detection position or the lifting speed and the preset target of the bobbin rail when the bobbin rail is lifted / lowered other than during spinning. When the difference from the position or the target speed exceeds a predetermined value, the control means may recognize that the bobbin rail has stopped abnormally.

In this case, when the difference between the detection position or lifting speed of the bobbin rail and the preset target position or target speed of the bobbin rail does not exceed a predetermined value, the control means recognizes that there is no abnormality in the lifting and lowering of the bobbin rail, The bobbin rail continues to move up and down.
On the other hand, when the difference between the detection position or elevation position of the bobbin rail and the preset target position or target speed of the bobbin rail exceeds a predetermined value, the control means recognizes that the bobbin rail has stopped abnormally.

  In the bobbin rail lifting apparatus in the above-described roving machine, the low torque limit value is at least a torque that allows the bobbin rail on which an empty bobbin is placed to be lifted and the bobbin rail. It is good also as a torque which can avoid the damage of the said raising / lowering mechanism in the time of an abnormal stop.

  In this case, the low torque limit value is at least torque that enables the bobbin rail on which the empty bobbin is placed to be raised and lowered, and torque that can avoid damage to the lifting mechanism when the bobbin rail stops abnormally. Therefore, the bobbin rail provided with the empty bobbin can be lifted and lowered, and even if the output torque is generated in the lifting motor up to the low torque limit value, the lifting mechanism is not damaged.

In the bobbin rail lifting device in the above-described roving machine, the present invention may include a torque sensor that detects an output torque of the lifting motor.
In this case, the torque sensor directly detects the output torque of the lifting motor, and detects an abnormality when the detected output torque reaches the low torque limit value.

  According to the present invention, it is possible to provide a bobbin rail lifting / lowering device in a roving spinning machine that can avoid damage to the lifting / lowering mechanism even when an abnormality such as a collision occurs during the lifting / lowering of the bobbin rail.

(First embodiment)
Hereinafter, a bobbin rail lifting device (hereinafter simply referred to as a “bobbin rail lifting device”) in the roving machine according to the first embodiment will be described with reference to the drawings.
FIG. 1 is a schematic view showing a main part of the roving spinning machine according to the first embodiment.

The drive system of the roving machine has a configuration in which the flyer drive system, the bobbin drive system, and the lifting drive system are each driven independently.
As shown in FIG. 1, the front roller 11 in the flyer drive system is disposed between a driven gear 13 fitted to one end of a rotating shaft 12 and a driving shaft 15 that is rotationally driven by a main motor 14. It is rotated via a belt transmission mechanism and a gear train (both not shown).
The main motor 14 of this embodiment is driven and controlled by an inverter 16.
A driven gear 19 is fixed to the upper portion of the flyer 17 so as to be integrally rotatable with the spindle 17c as an axis.
The rotation of the driving shaft 15 is transmitted to the rotary shaft 20 via a belt transmission mechanism (not shown).
The driven gear 19 is rotationally driven together with the flyer 17 via a drive gear 21 fitted to the rotary shaft 20.

A driven gear 24 is fixed to a bobbin wheel 23 provided on the bobbin rail 22.
A rotary shaft 26 to which a drive gear 25 that meshes with the driven gear 24 is fitted and fixed has a differential between the rotational force of the driving shaft 15 and the rotational force of a winding motor 28 that is driven and controlled via an inverter 27. The gear mechanism 29 is combined and transmitted.
The winding motor 28 for driving the bobbin driving system is controlled to reduce the rotational speed of the bobbin B attached to the bobbin wheel 23 in response to an increase in the roving winding layer.
Further, when the bobbin B is driven in a state in which the driving of the winding motor 28 is stopped, that is, in a state where there is no input from the winding motor 28 to the differential gear mechanism 29, the rotation speed is the rotation of the flyer 17. It is set to be the same as the speed.

The lifting mechanism of the bobbin rail 22 according to this embodiment includes a lifter rack 30, a pinion gear 31, and a rotating shaft 32 that are elements of a lifting drive system.
A lifter rack 30 is fixed to the bobbin rail 22.
The rotation of the driving shaft 34 is transmitted to the rotating shaft 32 to which the pinion gear 31 that meshes with the lifter rack 30 is fixed.
The driving shaft 34 is driven by an elevating motor 36 that is driven and controlled via a servo amplifier 35.
The lifting / lowering motor 36 functions as a servo motor that drives the lifting drive system.

The rotation direction of the rotating shaft 32, that is, the raising / lowering direction of the bobbin rail 22 is changed by switching between the forward and reverse rotations of the lifting / lowering motor 36.
A rotary encoder 37 that detects the moving direction and moving amount of the bobbin rail 22 is connected to the end of the rotating shaft 32.
A gear train may be interposed between the elevating motor 36 and the driving shaft 34, or the both 36 and 34 may be connected so as to be integrally rotatable.
Further, the rotary encoder 37 may be a resolver or an encoder attached to the lifting / lowering motor 36.

A sensor 38 for detecting the rotational speed of the front roller 11 is disposed in the vicinity of the driven gear 13 that rotates integrally with the front roller 11.
A sensor 39 for detecting the rotational speed of the flyer 17 is disposed in the vicinity of the driven gear 19.
The roving yarn R fed from the front roller 11 is guided to the flyer leg 17b from the flyer top 17a through the yarn introduction tube, and further to the bobbin B through the presser 40 from the lower part of the flyer leg 17b.
The presser 40 of this embodiment has a configuration in which a guide hole 42 is formed in the presser paddle 41 and a guide groove 43 for guiding the roving yarn R is formed in the guide hole 42.

The main motor 14 and the winding motor 28 are controlled by the control means 45 via the corresponding inverters 16 and 27, and the lifting motor 36 is controlled by the control means 45 via the servo amplifier 35.
The control unit 45 includes a CPU (central processing unit) 46, a program memory 47, a work memory 48, an input interface 49, an output interface 50, and an input device 51.
The CPU 46 executes a predetermined program stored in the program memory 47 and controls the main motor 14 and the winding motor 28 via the output interface 50 and the inverters 16 and 27, and also via the output interface 50 and the servo amplifier 35. To control the lifting motor 36.

An input device 51 for inputting spinning conditions such as spinning roving weight (gelen), fiber type, number of twists and the like is integrally incorporated in the control means 45 as a keyboard.
Output signals from the rotary encoder 37 and the sensors 38 and 39 are input to the CPU 46 via the input interface 49.

The program memory 47 is a read-only memory (ROM), and the program memory 47 stores a program and various data necessary for executing the program.
Examples of the program include a control program for the main motor 14 and the winding motor 28 during the coarse yarn winding operation, and a control program for stopping the doffing.
Examples of the various data include correspondence data of the moving speed of the bobbin rail 22 during spinning operation, the diameter of the roving yarn winding, and the rotational speed of the bobbin wheel 23.

The work memory 48 includes a readable and rewritable memory (RAM), and the work memory 48 stores data input by the input device, a calculation processing result in the CPU 46, and the like.
The work memory 48 includes a backup power source (not shown).

  The control program at the time of operation stop for doffing includes a step of stopping the operation of the machine base and a step of lowering the bobbin rail 22 to the doffing position thereafter.

In the control program, as a limit value of the output torque of the lifting / lowering motor 36, a spinning time (winding from the beginning of winding) set corresponding to an increase in the weight of the roving yarn accompanying winding or an impact load when the bobbin rail is reversed. A high torque limit value (until the end) and a low torque limit value set lower than the high torque limit value are set.
In the lifting / lowering of the bobbin rail 22 other than during spinning, the low torque limit value is set as the limit value of the output torque of the lifting / lowering motor 36.

Next, the operation of the roving machine will be described.
Prior to the operation of the roving machine, spinning conditions such as the spinning roving weight (gelen), fiber type, and number of twists are input through the input device 51.
When the operation of the roving spinning machine is started, the main motor 14, the winding motor 28, and the lifting motor 36 are driven synchronously at a predetermined rotational speed based on the spinning conditions.
By rotating the driving shaft 15 based on the driving of the main motor 14, the front roller 11 and the flyer 17 are respectively rotated at a constant speed with a predetermined rotation ratio.
The bobbin wheel 23 combines the rotation of the driving shaft 15 based on the driving of the main motor 14 and the rotation based on the driving of the winding motor 28 by the differential gear mechanism 29 to wind the roving yarn R around the bobbin B at each time point. The gear is driven at a speed corresponding to the diameter.

On the other hand, the bobbin rail 22 is lifted and lowered based on switching between the forward and reverse rotations of the lifting motor 36.
The roving yarn R spun from the front roller 11 is wound around the bobbin B. During the spinning operation, the CPU 46 counts the count based on the output signal of the sensor 38.
Then, when the count number based on the detection signal of the sensor 38 reaches a value corresponding to the roving length obtained from the spinning roving weight, it is determined that the roving winding has reached the full pipe, and the CPU 46 determines that the dwindling has been completed. Start stop control.

  In the doffing stop control, the coarse yarn cutting operation is completed through a step of stopping the operation of the machine base and a step of lowering the bobbin rail 22 to the doffing position.

Next, the doffing associated with the full pipe is performed, and a pipe replacement operation for inserting a new empty bobbin B into the spindle 17c is performed.
At the time of doffing, the bobbin rail 22 is positioned at the lowest position, the full bobbin B is removed from the bobbin rail 22, the bobbin rail 22 is raised to the empty bobbin insertion position, and the bobbin wheel 23 of the bobbin rail 22 is reached. Attach an empty bobbin B.
In this embodiment, the full bobbin B is manually removed from the bobbin rail 22 and a new empty bobbin B is mounted on the bobbin wheel 23 on the bobbin rail 22.
When the empty bobbin B is set on the bobbin rail 22, the bobbin rail 22 is raised to insert the spindle 17c into the empty bobbin B.
At this time, the limit value of the output torque of the lifting motor 36 that raises the bobbin rail 22 is set to a low torque limit value.
In this embodiment, if the high torque limit value during spinning is 100%, the low torque limit value is about 33% of the high torque limit value during spinning.

When the empty bobbin B on the bobbin rail 22 is not set on the bobbin wheel 23 in a normal posture, such as when a part of the empty bobbin B on the bobbin rail 22 is set to be inclined, the bobbin rail 22 is driven by the lifting motor 36. Ascending, the spindle and empty bobbin B collide.
Even if there is a collision, the elevating motor 36 tries to drive further, but because of the collision between the spindle 17c and the empty bobbin B, the torque of the elevating motor 36 increases.
At this time, since the limit value of the output torque of the lifting motor 36 is set to a low torque limit value, the lifting motor 36 slips when torque that reaches the low torque limit value is generated in the lifting motor 36. .
For this reason, since the driving shaft 34 of the raising / lowering motor 36 does not rotate and the rotating shaft 32 also does not rotate, the bobbin rail 22 stops rising.

This point will be described in detail. The control means 45 reads a pulse signal sent from the rotary encoder 37 to the control means 45 and a position command pulse signal received by the servo amplifier 35 from the control means 45 over time. Yes.
The accumulation of pulse signals sent from the rotary encoder 37 to the control means 45 indicates the lift position of the bobbin rail 22, and the pulse signal per unit time indicates the lift speed of the bobbin rail 22.
A decrease in the pulse signal per unit time from the rotary encoder 37 means a decrease in the lifting speed of the bobbin rail 22.
When the accumulation of pulse signals does not change, it indicates that there is no change in the lift position of the bobbin rail 22, that is, the lift of the bobbin rail 22 is stopped.

While a certain amount of pulse signal is output from the control means 45 to the servo amplifier 35 for the position command, when the number of pulse signals sent from the rotary encoder 37 to the control means 45 decreases, the difference between the two pulse signals increases. Therefore, the difference between the target position (or target speed) based on the command and the actual lift position (or lift speed) increases.
When this difference is equal to or greater than a predetermined value, after reaching the low torque limit value, the elevating motor 36 slips and the driving shaft 34 does not rotate, so it is determined that the elevating of the bobbin rail 22 has stopped abnormally.

The bobbin rail lifting apparatus according to this embodiment has the following effects.
(1) When the bobbin rail 22 moves up and down at times other than spinning, the limit value of the output torque of the lifting motor 36 is set at a low torque limit value. Even if a torque reaching the low torque limit value occurs in the lifting motor 36, the lifting motor 36 cannot output a torque larger than the low torque limit value, so the lifting motor 36 slips. To do. Accordingly, when a torque reaching the low torque limit value is generated in the lifting / lowering motor 36, the lifting / lowering of the bobbin rail 22 is restricted, so that the lifting / lowering mechanism is less likely to be damaged.
(2) When the difference between the elevation position or elevation speed of the bobbin rail 22 and a preset target position or target speed of the bobbin rail 22 exceeds a predetermined value, the control means 45 causes the bobbin rail 22 to stop abnormally. An abnormality can be detected.
(3) The low torque limit value is at least a torque that enables the bobbin rail 22 on which the empty bobbin B is placed to be raised, and a torque that can avoid damage to the lifting mechanism when the bobbin rail 22 is abnormally stopped. Therefore, even if the output torque up to the low torque limit value is generated in the elevating motor 36, the elevating mechanism is not damaged.

(Second Embodiment)
Next, a bobbin rail lifting apparatus according to the second embodiment will be described.
FIG. 2 is a schematic diagram showing the main part of the drive system in the roving machine according to the second embodiment, and the components in the lifting drive system are different from those in FIG.
Therefore, for the elements common to the first embodiment, common reference numerals are used for convenience of explanation.
Moreover, about the element common to 1st Embodiment, description of 1st Embodiment is used and description is abbreviate | omitted here.

In the bobbin rail lifting apparatus of the second embodiment, the lifting motor 54 is an induction motor, and includes an inverter 55 that drives and controls the lifting motor 54.
The inverter 55 performs vector control of the lifting motor 54. Specifically, the inverter 55 estimates the torque and the rotational speed based on the magnitude and phase of the current of each winding of the lifting motor 54, and based on the estimated torque and the rotational speed. By changing the voltage and frequency, control is performed to obtain the target torque and rotational speed.
The inverter 55 controls the elevating motor 54 so as not to exceed a current value corresponding to a preset low torque limit value.
According to 2nd Embodiment, there exists an effect equivalent to the effect (1), (3) of 1st Embodiment.
More specifically, when the inverter 55 performs vector control on the lifting motor 54, an encoder is not necessary, and the elements of the control system are simplified.

The present invention is not limited to the first and second embodiments described above, and various modifications are possible within the scope of the gist of the invention. For example, the following modifications may be made.
In the first and second embodiments described above, the case where the low torque limit value is set when the bobbin rail is raised during the pipe changing process has been described. Not only at times, but also a low torque limit value may be set for the entire ascent and descent including when descending. As a result, the control means can also recognize an abnormality caused by a collision between the bobbin rail and another article when the bobbin rail is lowered other than during spinning.

In both the first and second embodiments, the torque of the lifting motor is limited by the low torque limit value, and the bobbin is based on the lifting speed or the lifting position of the bobbin rail when the spindle and the empty bobbin collide. Although it is recognized that the rail has stopped abnormally and an abnormality due to a collision is detected, for example, an actual torque may be detected by a torque sensor and recognized as an abnormality when a preset low torque limit value is reached. . Alternatively, when the rate of change in torque changes suddenly and exceeds a certain rate of change, the control means may recognize that an abnormality has occurred in raising and lowering the bobbin rail.

It is a block diagram which shows the principal part of the rough spinning machine which concerns on 1st Embodiment. It is a block diagram which shows the principal part of the rough spinning machine which concerns on 2nd Embodiment.

Explanation of symbols

17 Flyer 17a Flyer top 17b Flyer leg 17c Spindle 22 Bobbin rail 23 Bobbin wheel 30 Lifter rack 31 Pinion gear 32 Rotating shaft 35 Servo amplifier 36, 54 Lifting motor 37 Rotary encoder 45 Control means 46 CPU (Central processing unit)
47 program memory 48 work memory 49 input device 50 output interface 55 inverter B bobbin R roving

Claims (4)

In the bobbin rail lifting apparatus in the roving machine, which has a bobbin rail that moves up and down via a lifting mechanism, a lifting motor that lifts and lowers the bobbin rail, and a control means that drives and controls the lifting motor.
The control means sets a low torque limit value set lower than a high torque limit value of the lifting motor at the time of spinning to an output torque of the lifting motor at the time of lifting the bobbin rail other than at the spinning time. A bobbin rail elevating device in a roving spinning machine having a function of setting as a limit value. When the bobbin rail is lifted or lowered other than at the time of spinning, the control is performed when the difference between the detection position or lift speed of the bobbin rail and a preset target position or target speed of the bobbin rail exceeds a predetermined value. The bobbin rail lifting / lowering device for a roving machine according to claim 1, wherein the means recognizes that the bobbin rail has stopped abnormally. The low torque limit value is at least a torque that enables the bobbin rail on which an empty bobbin is placed to be raised and lowered, and a torque that can avoid damage to the lifting mechanism when the bobbin rail stops abnormally. The bobbin rail raising / lowering apparatus in the roving machine of Claim 1 or 2 characterized by the above-mentioned. 2. A bobbin rail lifting device in a roving spinning machine according to claim 1, further comprising a torque sensor for detecting an output torque of the lifting motor.

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