JP3003258B2 - Roving yarn cutting method at doffing in roving machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cutting a roving at the tail end of a full roving package at a desired position suitable for resuming spinning when doffing a roving machine.

[0002]

2. Description of the Related Art At the time of doffing operation in a roving machine, it is necessary to cut a roving extending from a full roving package to a draft mechanism at an appropriate position therebetween. This cutting should be performed so that the roving end is out of the presser blade of the flyer by 5 to 6 cm in order to facilitate the winding operation on the empty bobbin to be set on the roving machine next time. Is desirable.

When the roving package reaches fullness, the roving machine stops, and then the bobbin wheel carrying the roving package descends with the bobbin rail to occupy a low position which facilitates doffing operations. At this time, an excessive tension is applied to the roving of the butt at the time of spinning. The roving extending from the front roller of the draft mechanism to the roving package,
The part of the presser blade receives the greatest frictional resistance. Therefore, in the case of a cotton roving or the like having a relatively short fiber length and a low roving strength, before the tension is increased until the friction exceeds this frictional resistance, the fiber slips through the feather plate portion as a base point and the above-described preferred roving The end is obtained.

However, in the case of a roving yarn having a long fiber length and a large strength, such as a synthetic fiber, even if the tension increases beyond the frictional resistance of the blade portion, the roving yarn is not cut, so that the increased tension extends into the flyer pipe. It extends to the roving in a region where almost no false twist is applied, and the cutting often occurs here. When the roving yarn breaks in the flyer pipe in this way, the operation of winding the yarn around the new bobbin takes much time and is not preferable. Therefore, as a countermeasure,
No. 97226 discloses that after once stopping the operation of the roving machine for doffing, the motor is started again at a low speed, and the roving yarn is rotated from the front roller for a predetermined time while rotating the bobbin wheel and the flyer at the same speed. Spin and then stop the motor again. Since the bobbin wheel and the flyer rotate at the same speed, the roving is not wound up during this period, and the spun roving exists between the front roller and the flyer top. Next, when the bobbin rail descends to the doffing position, the slack roving is pulled into the flyer pipe without tension, and then cut off naturally due to the frictional resistance of the presser blade.
A roving end of the roving is obtained at a desired position.

[0005]

However, in this method, it is necessary to restart the roving machine once stopped for doffing to cut the roving, so that the doffing operation becomes complicated and the operation is difficult. There is a disadvantage that the time is long. In addition, there is a possibility that the roving yarn may be broken due to a shock at the time of restart, and thus measures have been required.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and provides a roving yarn cutting method capable of forming a roving end of a roving yarn at a desired position by a simple operation during doffing. With the goal.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a roving spinning drive system and a roving winding drive system capable of controlling the speed independently of each other. In the roving machine configured to drive the bobbin wheel carrying the bobbin by the roving winding system, before performing the doffing operation of the roving package, first, the roving yarn on the bobbin without excess or shortage. Shift the flyer and bobbin wheel, which are rotationally driven synchronously so as to wind up, to low-speed operation, and then increase the rotation of the roving spinning drive system by a predetermined amount relative to the roving winding system. Forming a slack in the roving from the front roller to the roving package, and then stopping both drive systems to lower the bobbin rail to a predetermined position for doffing. Reached by It is.

[0008]

According to the present invention, when the roving package reaches the full package, the drive signal is switched from the normal operation to the low-speed operation while maintaining the synchronous state of both driving systems by the signal. Next, the rotation of the roving spinning drive system is increased by a predetermined amount with respect to the roving winding drive system, and the operation is continued.

During this operation, the roving length of the roving exceeds the winding length, so that an extra roving length obtained by multiplying the increased speed of the roving spinning drive system by the operation continuation time is supplied from the front roller to the roving. It accumulates as slack in the roving path to the yarn package. When the bobbin rail is lowered, the slack is lowered together with the roving package in a substantially tension-free state, and is tensioned on the way to be cut without difficulty at the blade portion of the presser.

Hereinafter, based on a preferred embodiment shown in the drawings,
The present invention will be described in more detail.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a front roller 1 constituting a roving spinning drive system has one end thereof and a driving shaft 3 which rotates integrally with a driving pulley 2 which is driven to rotate by a main motor M. Gear train 4 provided between
Is driven to rotate. Inverter 5 for main motor M
A variable-speed motor that can be driven to change the speed is used. A driven gear 7 is fitted and fixed to the upper portion of the flyer 6 so as to be integrally rotatable, and a driving gear 10 fitted to a rotating shaft 9 through which the rotation of the driving shaft 3 is transmitted via a belt transmission mechanism 8. Rotated.

On the other hand, a rotating shaft 13 to which a driving gear 12 meshing with a driven gear 11a of a bobbin wheel 11 mounted on a bobbin rail (not shown) is fitted and fixed. 14
The rotational force of the variable speed motor 15 driven to change the speed is combined by the differential gear mechanism 16 and transmitted. That is, the rotation of the drive shaft 17 driven by the variable speed motor 15 is input to the differential gear mechanism 16 via the gear train 18 and the belt transmission mechanism 19, and the belt transmission provided on the output side of the differential gear mechanism 16 is provided. The rotating shaft 13 is connected to the mechanism 20 via a universal joint 21 and a connecting shaft 22. The rotation of the drive shaft 17 is transmitted to a rotation shaft 25 on which a gear 24 meshing with a lifter rack 23 fixed to the bobbin rail is fitted via a switching mechanism 26 and a gear train 27. The switching mechanism 26 is connected to a molding device (not shown) and operates in cooperation with the motion of the molding device.
By switching the meshing between the bevel gears 26a and 26b and the bevel gear 26c, the movement of the lifter rack 23 is reversed, and the direction of the vertical movement of the bobbin rail is changed.

A rotation speed detector 28 for detecting the rotation speed of the flyer 6 is provided near one toothed pulley 8a constituting the belt transmission mechanism 8, and a bobbin wheel 11 is provided near the driven gear 11a of the bobbin wheel 11. A rotation speed detector 29 for detecting the rotation speed of the bobbin B is provided. FIG. 2 shows an example of a system for controlling the main motor M and the variable speed motor 15. A microcomputer 32 constituting the control device 31 temporarily stores a CPU (central processing unit) 33, a program memory 34 composed of a read-only memory ROM storing a control program, and input data and arithmetic processing results. The CPU 33 operates on the basis of the program data stored in the program memory 34. The working memory 36 comprises a readable / rewritable memory RAM.

An input device 35 for inputting spinning conditions such as the spinning number, the number of twists, the bobbin diameter at the start of winding, and the draw ratio between the front roller and the bobbin into the working memory 36 is used as a keyboard for the control device 31. It is integrated into one.
The detection signals from the rotation speed detectors 28 and 29 are
33. Further, in the vicinity of the cradle of the molding apparatus, a switching signal transmitting means 38 including a limit switch or the like is provided at a position where the signal can be engaged with the cradle in accordance with the switching of the bobbin rail lifting / lowering movement. It is input to the CPU 33.
The CPU 33 controls the rotation of the main motor M via the output interface 39, the motor drive circuit 40, and the inverter 5 based on the spinning conditions input by the input device 35. Further, an appropriate bobbin rotation speed is calculated based on the output signals from the rotation speed detectors 28 and 29, and is output via the output interface 39, the motor drive circuit 41 and the inverter 14 in accordance with the output signal of the switching signal transmitting means 38. Thus, the rotation of the variable speed motor 15 is controlled so that the proper bobbin rotation speed is achieved.

Next, the operation of the roving machine configured as described above will be described. Prior to driving the roving machine,
Spinning of the number of twists, bobbin diameter at start of winding (empty bobbin diameter), etc.
The output condition, the speed change pattern indicating the relationship between the bobbin diameter (the diameter of the roving yarn package) and the bobbin rotation speed shown in FIG.

When the roving machine is driven, the main motor M is driven at a variable speed via the inverter 5 according to the input conditions. When the driving shaft 3 is driven to rotate together with the driving pulley 2 by the driving of the main motor M, the front roller 1 and the belt transmission mechanism 8, the rotating shaft 9, the driving gear 10 and the driven gear 7 are transmitted via the gear train 4. Each of the flyers 6 is rotationally driven. Then, the rotation speed of the flyer 6 is detected by the rotation speed detector 28 and input to the CPU 33.

The variable speed motor 15 is also driven at the same time when the main motor M is driven, so that the drive shaft 17, the switching mechanism 26,
The rotary shaft 25 is driven via the gear train 27, and the lifter rack 23 is moved, whereby the bobbin B carried on the bobbin wheel 11 moves up and down together with the bobbin rail. On the other hand, the drive shaft 17, the gear train 18, the belt transmission mechanism 1
9, the rotational force input to the differential gear mechanism 16 and the rotational force of the driving 3 are combined by the differential gear mechanism 16,
Thus, the rotating shaft 13 is driven via the belt transmission mechanism 20, the universal joint 21 and the connecting shaft 22, and the bobbin wheel 11 is rotated. That is, the main driving force of the rotating shaft 13 is given from the driving shaft 3, and the driving force for shifting with the increase of the roving layer wound around the bobbin B is given by the variable speed motor 15. Lifter rack 2
The meshing between the bevel gears 26a and 26b of the switching mechanism 26 and the bevel gear 26c of the switching mechanism 26 is switched every time the winding of the roving thread R on the bobbin B is completed for one roving thread. Is changed by

In this way, the operation of the roving machine is continued,
The bobbin B carried on the bobbin wheel 11 is full
Once the roving package has been formed, it will be
The full-package signal is input to the control device 31. Control device 31
Are the inverters 5 and 1 of the main motor M and the variable speed motor 15
4 and a deceleration signal is issued, and both motors M and 15
While maintaining the synchronous speed ratio during rotation, the diagram shown in FIG.
Therefore, the speed is reduced, whereby the flyer 6 and the bobbin are decelerated.
Bin wheel 11 is a predetermined low speed value N_FAnd N _BMaintain
I do. In this state, the rotation of the flyer and bobbin wheel
Since the rotation speeds are perfectly synchronized,
The amount of roving R spun from the front roller 1
And wound up on bobbin B.

Next, the control device 31 issues a speed increasing signal only to the inverter 14 of the variable speed motor 15 so that the speed of the variable speed motor 15 increases stepwise to a predetermined speed over a predetermined time range β. As a result, the rotation speed of the flyer is maintained at a medium speed of N _F + ΔN. In this time range β, the spun length of the roving is longer than the winding length, so that extra roving is gradually accumulated in the roving path between the front roller 1 and the roving package, and the slack is reduced. Form. It will be clear that this slack yarn length will be proportional to the value obtained by multiplying the speed increase ΔN of the flyer by the time β.

[0020] After the predetermined time β has elapsed, flyer 6 is decelerated to the synchronous rotational speed N _F again, then the rotational phase of the flyer watches timing γ as stops in a position suitable for doffing, the motors M , 15 are issued. The length of the time range β is preferably controlled by counting output pulses of an encoder (not shown) for detecting the number of rotations of the front roller 1.

Next, the bobbin wheel is lowered, and the slack portion is lowered together with the roving package in a substantially tensionless state, and is tensioned in the middle of the bobbin wheel to be cut without difficulty at the blade portion of the presser (see FIG. 7). . Next, a second embodiment of the present invention will be described with reference to the diagram shown in FIG. In this example, when the full signal is input, both motors M and 15 are decelerated while maintaining the synchronous speed ratio at the time of steady operation,
This is the flyer 6 and the bobbin wheel 11 to maintain a predetermined value N _F and N _B over time range alpha. In this state, the roving spun from the front roller 1 is wound around the bobbin B without excess or shortage. Next, bobbin wheel 11
Only during this time period β, a slack is formed since the roving length of the roving exceeds the winding length. This slack amount can be changed by adjusting the time of β. Then, when a predetermined amount of slack is obtained, the flyer also stops.

A third embodiment of the present invention will be described with reference to the diagram shown in FIG. In this example, when the full signal is input, both motors M and 15 are decelerated during the time range α while maintaining the synchronous speed ratio during the steady operation. When the flyer enters the time zone β, the flyer is decelerated at the same gradient as the time zone α, but the bobbin wheel is further decelerated at a steep gradient, reaches the speed 0 first, and stops. As a result, the time range β
In, since the spun length of the roving is longer than the winding length, slack is formed in the roving. This slack amount can be changed by adjusting the length of the time range β and the rapid deceleration rate of the bobbin wheel.

The present invention is not limited to the above embodiment. For example, the flyer 6 and the bobbin wheel 1
It is also possible to shift 1 to low-speed rotation while maintaining the synchronous speed, and then further decelerate only the bobbin wheel again to form slack. Further, the speed of the flyer with respect to the bobbin wheel can be increased until the rotational speeds of the bobbin wheel and the flyer match.

[0024]

As described above in detail, according to the present invention, at the time of doffing, the operation of the roving machine is temporarily stopped as in the prior art, and then the machine is restarted for cutting the roving yarn. Without stopping the operation, the rotation speed of the flyer is increased / decreased, the synchronization with the rotation speed of the bobbin wheel is shifted, the slack of the roving is formed, and the roving can be cut at an appropriate position. ing.

Therefore, the doffing operation can be performed smoothly in a short time, and the production efficiency is improved.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a drive system of a roving machine to which the present invention is applied.

FIG. 2 is an example of a block diagram of a control circuit.

FIG. 3 is a diagram showing a relationship between a change in the diameter of the roving package during spinning and a bobbin rotation speed to be changed accordingly.

FIG. 4 is a time chart for controlling the rotation speed of a flyer and a bobbin wheel for forming slack of roving during doffing according to the first embodiment of the present invention.

FIG. 5 is a time chart for controlling the rotational speed of a flyer and a bobbin wheel for forming slack of roving during doffing according to a second embodiment of the present invention.

FIG. 6 is a time chart for controlling rotation speeds of a flyer and a bobbin wheel for forming slack of roving during doffing according to a third embodiment of the present invention.

FIG. 7 is a side view showing a cut state of a roving yarn.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Front roller 6 ... Flyer 11 ... Bobbin wheel 15 ... Variable speed motor 16 ... Differential gear mechanism 28, 29 ... Rotation speed detector M ... Main motor 31 ... Control device B ... Bobbin R ... Roving yarn

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-97226 (JP, A) JP-A-60-239527 (JP, A) JP-A-2-133621 (JP, A) Jpn. 22075 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) D01H 9/16 D01H 1/28 D01H 13/24

Claims (1)

(57) [Claims] A roving yarn winding drive system and a roving yarn winding drive system capable of controlling the speed independently of each other, wherein the roving yarn winding driving system drives a front roller and a flyer to drive the roving yarn. In a roving machine configured to drive a bobbin wheel carrying a bobbin by a system, before performing a doffing operation of a roving package, first, synchronously winding a roving yarn on a bobbin without excess or deficiency. Shift the flyer and bobbin wheel, which are rotationally driven, to low speed operation,
Next, the rotation of the roving spinning drive system is accelerated by a predetermined amount with respect to the roving winding drive system to form slack in the roving from the front roller to the roving package, and thereafter, both drive systems are rotated. And stopping the bobbin rail to lower the bobbin rail to a predetermined position when doffing.