JPH06211433A - Device to dissociate underwining thread from surface of cup - Google Patents

Abstract

PURPOSE: To sharply improve cutting efficiency regardless of the strength of threads to be cut in a device for dissociating under-winding threads from the surface of a cup. CONSTITUTION: A cutting means is constituted of a cutting tool 23 connected with a driving device 27 which is always moved almost laberally to threads during cutting, and a thread dissociator 17 is provided with a dent 22, and the cutting tool 23 is allowed to enter the dent 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device according to the preamble of claim 1 for separating underwinding yarn from the surface of a cup.

[0002]

2. Description of the Related Art In a ring spinning machine, for example, an underwinding extending from a tip of a cup toward a leg of a cup is usually formed by a yarn end at the end of the production of the cup. For this reason, for example, when the spindle becomes empty, the ring rail can be moved relatively quickly from top to bottom. The underwinding can be spun at the sleeve legs and twisted with the yarn. Also, the underwinding is located on the surface of the cup with a relatively strong tension.

When preparing a cup of this kind for the unwinding process of a winding machine, the yarn end is exposed as far as possible without damaging the surface of the winding part, and the yarn end is unwound. It is important to be able to capture in position and pre-install the corresponding winding assembly.

Devices are already known in which it is possible to locate the yarn start on the surface of the cup and then to place it in a defined position for the payout process. In many devices of this type, the cup is guided along many different handling stations, for example in one circular track, thereby forming a step-like preparation process.

US Pat. No. 2,675,971 discloses that
A preparation device for a cup, which is fed to the winding section of a winder, is disclosed. The underwinding is then dissociated by a hook formed from a bent wire by means of a suction slit arranged along the suction tube before the thread start is sought. The hook is supported in one joint and is further supported by the thread train of the captured threads, in particular parallel to the longitudinal axis of the cup,
This prevents the hook from entering the thread layer. The hooks then engage the cup surface until the cup moves further along the transport path by a predetermined amount. If the hook captures the underwinding thread directly after the hook contacts the cup surface, the hook pulls the thread portion extending toward the tip of the cup tightly on the surface of the cup wrap. It is also conceivable to bias the hooks downwards so that the captured thread is relatively late or non-tearable, whereby the cup surface additionally has a relatively flat surface. It becomes possible to form extremely strong windings,
As a result, it becomes extremely difficult to be captured by the subsequent device.

German Patent No. 3,925,988 A1 discloses a device for disengaging underwinding yarns, which is conventional in that the control of the catching of the underwinding yarn is performed by a yarn dissociator. The device is especially different.

All the devices mentioned so far have in common:
It is not suitable for disengaging relatively strong yarns, and is particularly unsuitable if the device is open at the sleeve winding at the previously described reverse winding. In turn, this may lock the entire transport system.

German patent application No. 41 31 44.9 already discloses a corresponding device in which the thread dissociator is formed as one of the legs of the scissors which opens at the beginning of the thread search. Or has a sharp cutting edge immovably arranged on the back side of the thread dissociator.
With this device, it is also possible to slide on the yarn dissociator to cut the underwinding yarn having a strength above average. In any case, in the case of the scissor leg part, the thread is caught between the scissor leg parts and the underwinding thread cannot be released before or during the further transport of the cup. Has been done. Therefore, a stagnation portion immediately occurs on the transport path. Similarly, the relative movement between the thread on the back side of the thread dissociator and the cutting edge may be insufficient to cut a very strong thread. In other words, in this case, the same result as described above occurs.

[0009]

SUMMARY OF THE INVENTION It is therefore an object of the invention to improve the device mentioned at the beginning so that it can further improve the cutting efficiency irrespective of the strength of the thread to be cut. is there.

[0010]

SUMMARY OF THE INVENTION In the present invention, the cutting means is constituted by a cutting tool connected to a drive device which is moved substantially transversely to the thread during the cutting, and the thread dissociator is provided. The above problem can be solved by having a recess on the opposite side of the cup and having the cutting tool protruding into this recess.

[0011]

Due to the constant movement of the separating tool, the jamming of the thread itself is effectively prevented during the thread cutting operation. Furthermore, by the cutting tool plunging into the depressions arranged on the rear side of the thread dissociator, the thread guided on the thread dissociator is guided on the upper and lower edges of the depression in the region of the cutting tool on both sides of the cutting tool. It is held and pulled by the edges. In this way the thread will not separate from the cutting tool. In other words, the safety of cutting can be ensured to the maximum and the locking of the cup in the conveying path can be prevented.

According to the invention, other advantageous configurations are possible with the features of claims 2 to 8.

A particularly simple and effective construction is possible by constructing the cutting tool as a cutting disc.

The principal dimension of the depression in the longitudinal direction of the thread dissociator is such that the direction of movement of the cutting means is substantially perpendicular to the longitudinal axis of the thread. This also simplifies the cutting.

Depending on whether the cut lower end of the underwinding yarn is further sucked in the area of the total preparation device of the cup, different starting times for the drive of the cutting tool can be selected. If a suction of this kind takes place, the drive of the cutting tool can already be activated at the beginning of the yarn dissociation process. This causes the underwinding yarn to be cut immediately after it is captured. However, if a separate spacing device for the lower end of the underwinding yarn is not provided, it is advantageous to operate the cutting tool only when the search for the yarn on the cup surface is complete. In this way, either the actual yarn end of the underwinding yarn is dissociated along the cup or, in some cases, the lower end is torn off to bounce back towards the cup leg. The possibility arises. In that case, the cutting tool does not cut the unwound or unbroken underwinding thread, so that the thread does not get stuck in the thread dissociator or cause stagnation of the cup. It has only such a function.

In order to ensure sufficient cutting safety, the cutting disc has a sharp outer edge on the outer periphery thereof,
The outer edge optionally has a rougher surface. This rough surface assists the cutting action by loosening the thread.

[0017]

EXAMPLES Next, the present invention will be described in detail based on examples.

The cup 1 is erected by a leg of a cup sleeve 3 being fitted on a caddy, and is conveyed along a guide track 5 on a conveyor belt 6. The guide track 5 has a transport passage 7 which serves to guide the caddy 4 and the transport belt 6.

A cup 1 coming from a cup feeding station or directly from a ring spinning machine is fed to the device according to the invention for separating the underwinding yarn 2. In the drawing of FIG. 1, the frame 18 supporting the thread dissociator 17 is located in the working position. That is, the frame 18 is swung toward the transport path 5 or toward the cup 1. Revolving shaft 1 for supporting the frame 18
9 simultaneously forms the pivot axis for the frame 18. The pivot shaft 19 is fixedly connected to the frame 18 via fixing devices 20 and 20 '. This fixing device may be formed by a brazing or welding connection or by a detachable connection, for example a screw connection.

The direction of movement of the conveyor belt 6 and thus the cup 1
The direction of movement of the caddy 4 with is indicated by arrows. The caddy 4 is stopped by a stopper, not shown here, while the conveyor belt is in constant motion. This is because the transport is done by frictional connections only. Similarly, the arrival of the caddy 4 is confirmed by a sensor (not shown) arranged on the upstream side. After that, the already mentioned stopper is activated and the rotary drive for the cup 1 is activated.
This rotary drive mainly comprises a drive roller 10 and two belt discs 8 and 9, around which a common flat belt 11 is located.

The belt disks 8 and 9 and the drive roller 10 are rotatably supported on the support plate 12.
The support plate 12 is swung by the support 13 through the opening 7 ′ towards the caddy 4. This turning movement is suggested by the double arrow. A flange wheel 16 is arranged on the opposite side of the transport track 5, which flange wheel 16 is likewise pivotally supported but immovably arranged. The flange wheels 16 together with the belt discs 8 and 9 and the flat belt 11 form a kind of rotary bearing for the caddy 4 with the cup 1.

The control unit 15 controls the drive motor 14 which drives the drive roller 10 and drives the belt disks 8 and 9 via the flat belt 11. It is further suggested that the control unit 15 has, for example, a stop, not shown, and a further control connection, which leads to a rotator or pivot 19 for the frame 18. Furthermore, the motor 27, which will be explained later separately, can also be controlled via the control unit 15. Control unit 15
Receives a departure signal from a sensor (not shown) arranged on the transport track 5, and thereafter issues a control command based on a fixed time sequence fixedly.

The yarn dissociator 17 is fixed to the frame 18 via a fixing screw 21 so that the surface of the yarn dissociator on the cup side projects from the surface of the frame 18 at least at the yarn searching position. There is. However, the distance between the frame and the cup-side surface is then so small that the frame can be supported on the cup surface, albeit slightly. In this manner, it is possible to prevent the yarn dissociator 17 from entering the cup winding portion by the front edge portion thereof.

The back side of the thread dissociator 17 projects into the opening 18 'of the frame 18. The upper and lower edges of this opening 18 'likewise form guides for the underwinding thread 2 and / or for the looper 2'which is pulled through the back of the thread dissociator 17. It forms a guide.

The frame 18 has a support plate 18 "which supports a sleeve-like holding part 28 for the motor 27. The support plate 18" and the holding device 28 are connected to each other, for example by a brazing connection. You can

The motor 27 has a motor shaft 24, and the shaft 2
4 has a stopper plate 2 for the cutting disc 23
5 is fixed. The cutting disk 23 is the motor shaft 2
It is pressed against the stopper plate 25 with the help of a nut 26 screwed onto the 4.

This connection allows the cutting disc 23 to participate in the rotary movement of the motor shaft 24. The cutting disc 23 has a sharp outer edge 2 on its outer periphery.
It has inclined chamfers on both sides ending in 3 '. The cutting disk 23 preferably has a hard body part for forming a rough surface, at least along and near the outer edge 23 '.

The cutting disk 23 projects into a recess 22 located on the back side of the yarn dissociator 17 on the opposite side of the cup.

In FIGS. 2a to 2d, 4 are continuous with each other.
Two phases are shown in the figure. First, the looper 2'of the underwinding yarn 2 is extruded via the chamfered portion 17 'of the yarn dissociator 17. The phase shown in FIG. 2a then corresponds to the phase shown in FIG.

From FIG. 2b, underwinding yarn 2
It can be seen that the knuckle 2'is completely guided on the thread dissociator 17, that is, the knuckle 2'has already passed the chamfered part 17 '.

FIG. 2C shows underwinding yarn 2
It is shown that the inner ring 2'of the wheel reaches the recess 22 and contacts the outer edge 23 'of the cutting disk 23.
At this time, the rim 2'is relatively strongly tightened via the recess 22, so that a corresponding pressing force is created on the outer edge 23 '. In addition, the tunnel 2'is curved in the recess 22 even if it is small or large, as can be seen especially from FIG. Cutting disc 23
Due to the movement of the outer edge 23 'of the underside of the underwinding yarn 2 transverse to the yarn longitudinal axis, the separated yarn end 2 "is shown in FIG. Cutting work is achieved.

Sharp outer edge 23 'based on chamfer
Due to the above-mentioned rough surface, this cutting operation can be carried out without problems even with extremely strong yarns.

It will be appreciated that the slots 29 present in the frame 18 make it possible to adjust the position of the thread dissociator 17 in the frame 18 depending, for example, on the diameter of the cup. The long hole 30 which is additionally present is
By turning and rotating the yarn dissociator 17 by 180 °, it is possible that the same device could be used for the cup 1 in the opposite winding direction. The slot 31 in the support plate 18 "suggests that the retaining plate 18" may be releasably coupled to the frame 18 instead of a non-releasable coupling device with the frame 18. Further, the long hole 31 is provided so that the position of the supporting plate 18 ″ is set to the other frame 18 and the motor 27 is connected to the motor shaft 2 thereof.
Suggesting that it can be modified to allow adjustment with a cutting disc 23 fixed in position 4, and indent 2
2 suggests that the position of the cutting disk 23 and the plunge depth can be varied.

Due to the detachable fixing of the cutting disc 23, it is possible to replace the cutting disc itself due to wear without problems.

[Brief description of drawings]

FIG. 1 is a perspective view of the device of the present invention in a cup transport path.

FIG. 2 is a diagram of four phases in an underwinding yarn supplying and cutting process.

FIG. 3 is a partially cut side surface of a cutting tool in a cutting process.

[Explanation of symbols]

 1 cup 2 underwinding yarn 2'ringer 2 "yarn end 3 cup sleeve 4 caddy 5 guide track 6 conveyor belt 7 passage 7'opening 8,9 belt disc 10 drive roller 11 flat belt 12 support plate 13 support 14 drive Motor 15 Control unit 16 Flange wheel 17 Thread dissociator 17 'Chamfer 18 Frame 18' Opening 18 "Support plate 19 Pivot shaft 20, 20 'Fixing device 21 Fixing screw 22 Cutting disk 23' Outer edge 24 Motor shaft 25 Stopper Plate 26 Nut 27 Motor 28 Holding Device 29, 30, 31 Long Hole

Claims (8)

[Claims] 1. A device for separating an underwinding yarn (2) from the surface of a cup (1), said device being located on a transport track (5) and located on the transport track. A thread dissociator (17) which is capable of abutting against, and means (8 to 1) for rotating the cup to bring the thread dissociator under its underwinding thread at its front edge.
6)), wherein the thread dissociator is provided with a cutting means for separating the underwinding thread slid on the thread dissociator. Is constituted by a cutting tool (23), which is connected to a drive (27) and which is moved almost transversely to the thread during the cutting, the thread dissociator (17) being recessed on the opposite side of the cup. Device for unwinding an underwinding yarn from the surface of a cup, characterized in that it has (22) and a cutting tool (23) projects into this recess (22). 2. Device according to claim 1, characterized in that the cutting tool is a cutting disc (23) and the drive is a rotary drive (27). 3. Device according to claim 1 or 2, characterized in that the recess (22) extends substantially in the longitudinal direction of the thread dissociator (17). 4. A drive (27) for the cutting tool (23) is connected to a control device (15), said control device (1).
Device according to any one of claims 1 to 3, characterized in that 5) switches the drive device (27) on at the beginning of the thread dissociation process. 5. A drive device (27) for the cutting tool (23) is connected to a control device (15), said control device (1).
5) The drive device (27) is switched on at the earliest when the rotary drive device (8 to 16) for the cup (1) is stopped.
The described device. 6. The thread dissociator (17) is inserted in a pivotable frame (18) and the thread dissociator (17)
6. Device according to any one of claims 1 to 5, characterized in that it projects at least in the yarn search position of the yarn dissociator (17) on the surface of the frame (18) on the cup (1) side. . 7. The cutting disk (23) is chamfered in order to form a sharp outer edge at its outer circumference (23 ').
The apparatus according to any one of 1 to 6 above. 8. The cutting disk (23) has a rough surface at least on its outer periphery (23 '),
Device according to any one of claims 2 to 7.