JPH02133621A - Cutting of winding end of roving in roving frame during doffing and device therefor - Google Patents

Abstract

PURPOSE:To surely automatically cut roving at a position somewhat separated from a battledore of presser by slightly dropping a bobbin rail after stopping of machine stand, mutually rotating a bobbin and a flyer in the opposite directions and lowering the bobbin rail. CONSTITUTION:After a roving bobbin is made full bobbin and a machine stand is stopped for doffing, a bobbin rail 15 is slightly dropped and at the position, one of a bobbin B and a flyer 5 is rotated in the direction reverse to that in ordinary winding operation to enlarge a winding angle of roving R against battledore 39b of a presser 39. Then the bobbin rail 15 is dropped to a doffing position. In the operation, the roving R is cut at a position reeled from the battledore 39b.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and apparatus for cutting the end of a bobbin during doffing in a roving frame.

[Prior Art 1] In a roving frame, it is always necessary to cut the end of the roving winding of a full pipe at some point during the doffing operation associated with full pipe. and,
When considering the next winding operation, the cutting position should be an appropriate length (50 to 60 mm) from the tip of the flyer blade.
It is desirable to cut it leaving mm ). However,
The reality is that the roving yarn is not cut at the desired position due to its strong strength or large mu.

The following may be the reason for this. When a predetermined amount of 11 yarns are wound on the bobbin to form a full tube, the full yarn is lowered from the lifting range during spinning to a predetermined position for doffing, which is one step lower. The front roller reliably grips the roving at the 0 winding end point - F, where a tension greater than the tension during winding is exerted on the yarn, but there is also resistance from the flyer neck and pre-twister along the way through which the roving passes. Since it is large, the maximum tension generated in the fit yarn is at the part where it exits the battledore of the presser. Therefore, for small m-fibers with 11 yarn strength such as cotton, the distance is 50 to 60 y from the tip of the presser battledore.
The roving is naturally cut at the n m position, but with long fibers such as synthetic fibers and large roving strength, the roving is not cut at this desired location, but rather the front roller twists unstablely or barely. The roving often breaks at the weak point between the flyer top and the strong i#J, and this requires time-consuming repair work such as passing the roving through the flyer when winding the next time. In the case of fibers with high roving strength, such as synthetic fibers, they are manually cut at the desired position before the bobbin rail is lowered to a predetermined position for doffing. This not only requires a considerable amount of labor and time from the operator, but also poses a major obstacle when attempting to automate doffing.

As a method to solve this problem, JP-A-60-23952
Publication No. 7 describes a bobbin rotary drive system that is equipped with a differential device that combines the rotation of the main drive shaft (driving shaft) and the rotation from the cone drum speed change tR to the differential device. An electromagnetic clutch is provided in the middle of the power transmission path, and a timer is used to disconnect the electromagnetic clutch during inertia rotation when the machine is stopped due to a full tube, thereby transmitting the rotational input from the cone drum transmission mechanism to the differential device. By cutting the bobbin at the same speed as the flyer and stopping the winding of the 11 threads sent out from the front roller, slack is created in the roving between the front roller and the flyer top for doffing work. A roving cutting method has been proposed in which the roving is not cut between the front roller and the flyer top when the bobbin rail is lowered to a predetermined position, but is cut at the position where it exits the breather.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional method, the inertia force is used when the machine is stopped, and a timer is used to turn on and off the electromagnetic clutch during manual rotation, so that the roving is kept at a predetermined level. I try to provide some slack. However, because the inertial force varies between machines or due to differences in the winding diameter of the bobbin, it is difficult to set the slack of the thread to a predetermined value, and as a result, the braided thread cannot be cut reliably at the desired position. There is a possibility. In addition, since the amount of slack in the roving is adjusted by the timing of turning on and off the electromagnetic clutch, the amount of slack in the roving changes due to wear of the electromagnetic clutch's rubbing plate even if the timer setting is the same.
There is a problem in that management such as gap adjustment takes time and effort.

Furthermore, when the machine is stopped, the vortex tube thread F is
The roving R connected to is an extension of the arm portion 39a of the Gresser 39.
2, the winding of the roving R on the battledore 39b has a small angle, and the frictional resistance of the yarn R on the battledore 39b is small. When the bobbin rail 15 is lowered in this state,
The tension applied to the Wl thread R when the bobbin rail 15 is lowered is at the upstream end of the battledore 39b! 1, and the roving R is likely to be cut within the flyer or between the flyer top 5a and the front roller 1.

The present invention has been made in view of the above problems, and includes:
``The first objective is that doffing for one round per full pipe can reliably cut the unwinding of the roving near the point where it exits the battledore of the presser.
To provide a method and device for unwinding and cutting the phase system during doffing in a spinning machine, which eliminates the need for manual work and enables complete automation of doffing. Means for Doffing] In order to achieve the above object, in the present invention, the outside of the machine for doffing + L t& and the bobbin rail are only slightly
~100mm) and pause, and at that position, rotate the bobbin and flyer relative to each other in the opposite direction to the normal winding operation to attach the roving yarn to the battledore of the pre-sleeve.
The paddle and bobbin rail have been made larger in size so that they can be lowered to a predetermined position when doffing.

In addition, the apparatus η for carrying out the above-mentioned ``nl bobbin end winding method'' includes: 2 a variable speed motor that can be driven in forward and reverse rotation to drive a spindle that can be driven separately from the draft part; a variable speed motor capable of forward and reverse rotation for driving a bobbin rail; and a variable frequency power supply for driving both variable speed motors at variable speeds;
After stopping the machine for doffing F, first move the bobbin rail down and then rotate the spindle in the opposite direction to the spinning direction so that the first bobbin rail descends to the normal position y1. A controller 011'A:ξ for driving and controlling both the variable speed motors via the variable frequency power supply is provided.

[Function] In the present invention, when the spinning machine 11 is stopped at the doffing lick, first the bobbin rail is slightly damaged (30 to 100 rtr
m) and pauses at that position.

Next, either the bobbin or the flyer is rotated in the opposite direction to that during normal winding operation, and its rotation is stopped at a position where the af1 angle of the vIl yarn that wraps around the battledore of the pre-sousa becomes large. When the bobbin rail is lowered to a predetermined position for doffing, tension is applied to the roving as the full bobbin thread descends. As it descends, the frictional resistance of the roving at the battledore part of the prezza increases, making it difficult for the tension applied to the roving to be transmitted to the roving upstream from the breather, and the roving reaches the desired position around 50 to 60 mm from the tip of the battledore. It will be severed.

[Example 1] An example embodying the present invention will be described below with reference to FIGS. 1 to 7. As shown in FIG. 2, the front roller 1 constituting the draft parlage 1 has its ends connected to a driving shaft 3 that rotates integrally with a driving pulley 2 that is rotationally driven by a main motor (not shown). It is designed to be rotationally driven via an i-vehicle train 4 arranged between the two. The flyer 5 has a wave gear 6 fitted and fixed thereon so that it can rotate integrally with the flyer 5, and the flyer 5 has a wave gear 6 fitted and fixed thereon so as to be able to rotate integrally with the flyer 5.
It is designed to be rotated via a drive gear 9 fitted to the shaft 118.

On the other hand, the bobbin wheel 10 as a spindle mounted on the bobbin rail 15 (shown in Figure 1.7)
A rotating shaft 12 to which a driving gear 11 that meshes with a gear 10a is fitted and fixed is a driving shaft 16 driven by a variable speed motor 14 capable of forward and reverse rotation, which is driven at variable speeds via an inverter 13 as a variable frequency power source. Universal joint 17
and are connected via a connecting shaft 18. Further, the rotating shaft 21 fixed to the bobbin rail 15 and fitted with a shaft 20 that meshes with the lid rank 19 is the output shaft of a variable speed motor 22 which is driven via an inverter 13 and is capable of forward and reverse rotation. 23 and 24 through gears 23 and 24.

In the vicinity of the gear 1a that rotates integrally with the front roller 1, a rotational speed detection 825 as a spinning speed detection means is provided.
A rotational speed detector 26 for detecting the rotational speed of the fryer 5 is provided near the wave gear 6 of the fryer 5. Between the front roller 1 and the flyer top 5a, a one-piece contact type tension detection device 27 for detecting the tension state of the yarn R is disposed. As the tension detection device 27, for example, the system 8 disclosed in Japanese Patent Application Laid-Open No. 116016/1983 is used. Moreover, the y? of the bobbin rail 15 is located at the end of the rotating shaft 21. A rotary encoder 28 is provided for detecting erosion.

Next, an electric circuit for driving and controlling the variable speed motor 14, 22 will be explained with reference to FIG.

A microcomputer 30 constituting the control device 29 includes a central processing unit (hereinafter referred to as CP Ll) 31, a program memory 32 consisting of a read-only memory (ROM) that stores a control program, and an input device 33. data and CI-) tJ 31, and a working memory 34 consisting of a rewritable memory <RA~1) for temporarily storing arithmetic processing results etc. in the CPU 31; operate on the basis of

In the program memory 32, after the machine stops for doffing,
First, the bobbin rail 15 is moved downward, and then the bobbin wheel 10 is rotated in the opposite direction to the spinning direction, and then the inverter 1 is moved so that the bobbin rail 15 is lowered to a fixed position.
A control program for driving and controlling both the variable speed motors 14 and 22 via the variable speed motor 3 is stored.

The input device 33, which inputs the number of twists, the bobbin diameter at the start of winding, the bank roving, etc. into the industrial memory 3.1, has two control devices, a keyboard, and one controller. Aif rotation speed detector 25.
Detection No. 1.1 from 26 and the output signal from the rotary encoder 28 are directly input to the CPU 31 fJ, and detection No. 15 from the tension detection device r127 is input to the CPU 31 via the A and 'D converters 35. C, It's turning. C
Based on the output signal from the rotary encoder 28, the PU 31 determines whether the current winding yarn layer is the fi''1st layer and the switching timing of the lifting/lowering movement of the bobbin spool 15, that is, the rotation direction of the variable speed motor 22. Calculate the timing of UIJ replacement.

Moreover, c p U 3 t is the spinning 2! inputted by the input device 33 based on the output No. 11 from the 0-Tari encoder 28 . The appropriate rotational speed of the bobbin 174121 corresponding to the rotational speed is calculated. Then, the variable speed motor 111 is driven via the output interface 36, the winding motor drive circuit 37, and the inverter 13 to determine its rotational speed, and the output interface 36, The rotational direction of the variable speed motor 22 is switched and the variable speed is driven via the lifting motor drive circuit 38 and the inverter 13. That is, the bobbin wheel 1O and the bobbin rail 15 are moved by the variable speed motors 14 and 22 independently from the draft bar.

Next, the operation of carrying out the roving boundary cutting method of the present invention using the apparatus configured as described above will be explained. The fil yarn 1N sent out from the front roller l is sent to the flyer 5.
Due to the difference in rotation of the bobbin wheel 10, the thread is wound onto the bobbin I3 while being twisted.

When the roving R is not wound onto the set length bobbin [λ, the machine is fully loaded and stopped for doffing. In this state, Figure 1 (
a) and as shown in Figure 4, the full tube thread 1? The six ends of the roving 1t connected to the roving 1t form a T-shape extending along the longitudinal direction of the arm portion 39a of the presser 39. Therefore, this condition 2B
In this case, the angle of the m thread I (attached to the blade j' plate 391) is very small. In this state, the variable speed motor 22 is slowly driven in the direction of lowering the bobbin rail 15, and the bobbin rail 15 is It is temporarily stopped at the position where it has descended -100 mm.At this time, the thread R is in the state shown in 1st I:PJ (b), and the winding 1/1 angle θ of the 1411 thread R against the battledore 39 is the 5th As shown in the figure, it is still small.

Next, the variable speed motor 11 is driven to rotate in a direction opposite to that during normal spinning, and stops when the pobin-pool 10 has been rotated approximately 90 degrees. As a result, as shown in the first [λ1(c) and FIG. 6, the winding angle θ of the yarn R connected to the full tube yarn F from the arm portion 39a of the brezzar 39 with respect to the battledore 39b becomes large. In this state, the variable speed motor 22 is driven to lower the bobbin rail 15 to a predetermined position for doffing.

Midway down one line of the bobbin rail 15, the yarn R is lifted from the battledore 39 b by a distance longer than its fiber length (it is cut at the J position).

To explain in detail, as shown in FIG. 11(a), when the rock is stopped on time, the Ul thread R is connected to the length of the arm 39a of the presser 39.
[Since it extends in the direction 11, the battledore 39b
The winding angle θ of the roving R with respect to the battledore 391 is small, and the contact area of the roving 1 with respect to the battledore 391 is also small.

Therefore, in this state, when the bobbin rail 15 is lowered all at once to the doffing position 2 as in the conventional method of cutting the end of the roving thread 1, the tension acting on the 1f roving R as soon as the bobbin rail 15 is lowered. However, in the device of the present invention, the bobbin toll 15 is lowered to a predetermined position when threading. ) 111 ] As shown in FIG. 61 (C) and FIG. After the bobbin rail 15 is placed in a large state with a large contact area with the battledore 39b, the bobbin rail 15 is lowered to a predetermined position for doffing. Moreover, when the contact area with the battledore plate 39b is at its inner limit, when the roving R is pulled by 1 degree due to the lowering of the bobbin rail 15, the tension becomes difficult to be transmitted to the upstream side of the blade T-plate 39I). When the full yarn F descends with the bobbin rail 15 in the state of 1 or 2, the yarn R is separated from the battledore 39b by approximately the average fiber length or more, that is, 50% 60 mm from the tip of the battledore 391). disconnected.

[Example 2 Next, a second embodiment will be described with reference to FIG.

The immediate action mechanism of this embodiment is the rotation of the driving shirt l-3 and the cone drum speed change mechanism/10, similar to the conventional spinning machine.
The rotation from the differential device 41' is combined with the bobbin wheel 10. ! ! I've been kidnapped.

Further, an electromagnetic clutch MCI is provided on the shaft 42 between the cone drum transmission mechanism 40 and the differential gear knee 11, and a gear li3 is provided between the electromagnetic clutch MCI and the differential gear 41 to connect the shaft 42 and the body rotation i1. It is fitted and fixed to Noh. The rotation of the motor M is transmitted to the gear 43 via the electromagnetic clutch MC, 2 and the gear 44. When carrying out the method of the present invention using a refilling device, the 5-bobbin rail 15 is moved from 30 to
After descending by 1100 nn, the electromagnetic clutch MCI is disconnected to disconnect the cone drum transmission mechanism 40 and the differential gear Z41. In this state, the electromagnetic clutch MC2 is connected and the motor M is driven to rotate the bobbin wheel 10 approximately 90 degrees in the opposite direction to that during normal spinning. As a result, the bobbin wheel 10 is rotated independently of the draft part 2, resulting in the state shown in FIG. 1(C) in the same manner as described above. Therefore, from this state, by lowering the 11-bin rail 5 to the predetermined 11"I position for doffing, the end of the ``n1 bobbin of the full tube line is 50 to 60 mm from the tip of the battledore 39b. Automatically disconnected at digit 1.

Note that the present invention is not limited to the above embodiments,
For example, in order to obtain the state shown in FIG. 1(C), instead of rotating the bobbin wheel 10 in the feeding force direction as in normal spinning, 5. Fly with the bobbin wheel 10 stopped.
S-5 may be rotated approximately 90 degrees jF at low speed. In order to implement this, for example, as shown in FIG. 9, an electromagnetic clutch MC'3 is provided in the middle of the gear train 4, and the electromagnetic clutch MC'3
By rotating the driving shear 71-3 in the state of 3, the flyer 5 is rotated independently of the draft bar and the bobbin wheel 10. In addition, bobbin rail 1
The angle at which the bobbin wheel 10 and the flyer 5 are rotated relative to each other with the bobbin wheel 10 and the flyer 5 lowered by 100 mm to 30 is not limited to 90 degrees;
becomes larger, and the tension between the 1st thread R and the battledore 391) becomes larger, and the tension of the 1st thread (connected to the full pipe thread F) increases.
The rotation 1 may be changed as long as it is large enough to prevent the rotation from being transmitted to the upstream side, and the rotation 1 may be changed depending on the difference in the spinning raw material.

[Effects of the Invention] As described in detail above, according to the present invention, when doffing due to tsunami, the battledore of the button 1/tsuza can be adjusted while lowering the bobbin L/L to a predetermined position. The roving can be precisely cut in the vicinity where it comes out, and regardless of the type of raw material fiber of the spun yarn, manual work by the operator is unnecessary, making it possible to automate the finishing process. Further, when the present invention is implemented using the device according to the second claim, it is possible to implement the present invention by simply changing the control program of the control 3g device.

[Brief explanation of drawings]

Figures 1 to 7 do not show one embodiment of the present invention υ11, and Figure 1 (a) and (d) are side views of essential parts showing the action of the 11 thread cutting method, and Figure 2 is A schematic perspective view of the drive mechanism, FIG. 3 is a block circuit diagram, FIG. 71 is a schematic side view in a stopped state, and FIG. 5 is an enlarged cross section along the line A=A in FIG.
Figure 6 is an enlarged sectional view taken along line B-B of Figure 1(c), and Figure 7
The figure is a schematic side view showing the state at the time of cutting the end of the roving, FIG. 8 is a schematic perspective view of the drive mechanism of a modification, and FIG. 9 is a partial perspective view of the drive mechanism of another modification. 71"7 controller 1, fly to -5, bobbin wheel 10 as spindle, inverter 13 as variable frequency power supply. Variable speed motor 14.22, main bin rail 1
5. Control device 29, Gresser 39, Battledore 39b, Roving Y.

Claims (1)

[Claims] 1. After stopping the machine for doffing, the bobbin rail is slightly lowered and stopped temporarily, and at that position, the bobbin and flyer are rotated relative to each other in the opposite direction to the normal winding operation. A method for cutting the end of a roving during doffing in a roving frame, in which the bobbin rail is lowered to a predetermined position for doffing after increasing the winding angle of the roving around the battledore of a presser. 2. A variable speed motor that can be driven in forward and reverse rotation to drive a spindle that can be driven separately from the draft part, and a variable speed motor that can be driven in forward and reverse rotation to drive a bobbin rail that can be moved up and down separately from the draft part. A variable speed motor, a variable frequency power supply for driving both of the variable speed motors at variable speeds, and after stopping the machine for doffing, first move the bobbin rail downward, and then rotate the spindle in the opposite direction to that used for spinning. move it,
and a control device that drives and controls both of the variable speed motors via the variable frequency power supply so that the bobbin rail is then lowered to a fixed position.