JP2994787B2 - Thread cutting device for spindle of spinning or twisting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention has an edge provided between a tube receiving portion of a spindle and a winding position of the spindle for fixing a spun yarn, and protruding radially from the spindle. An annular member having a plurality of notches whose sharp edges are inwardly directed at an acute angle, the edges of which are formed as blades. And a thread cutting device for a spindle of a spinning machine or a twisting machine.

[0002]

2. Description of the Related Art In a spinning machine or a twisting machine, after completion of cup forming, a so-called doffing preparation is performed, and the machine is placed in a preparation state for automatic cup change. For this purpose, in a ring spinning machine, for example, the ring rail is moved relatively quickly into the lower region of the tube, whereby the yarn of the cup draws a relatively steep torsion line relative to the cup surface. To the winding position, where it is wound in multiple layers to form a so-called underwind dig. This underwine dig section firmly holds the spun yarn on the spindle, so that after replacing the full cup with an empty tube, it is possible to start a new spinning operation. As the cup is removed from the spindle, the yarn is cut between the winding on the tube and the underwind dig on the spindle.

[0003] In order to cut such a yarn, a disk-shaped yarn cutting device having a number of notches provided with blades formed so as to be integrally formed on a spindle and having a circumferential surface is provided in a radial direction relative to the spindle axis. (See German Offenlegungsschrift 3202 888). When replacing the cup, the full cup is firstly removed from the spindle by the automatic lifting device. In this state, the spindle is again rotated for a certain time around the thread cutting ring which is rigidly connected to the spindle, whereby the thread is cut. The full cup is then completely doffed from the spindle.

[0004] It is also known to rotate the thread cutting ring in order to cut the thread existing between the cup winding and the underwinding section, without having to rotate the spindle itself again for a short period of time (Germany). Republic Patent Publication No. 1760 184). This thread cutting mode is effected by threads provided in the area of the tube housing of the spindle. When the tube carrying the full cup is withdrawn, the drive member is lifted together by a certain distance on the spindle, this drive member being rotatably supported on the spindle by a thread and comprising a cutting ring. Gear mechanism is forcibly rotated.

[0005] It is also known that a thread cutting device is formed by providing a spindle with two rings each having a notch formed by distributing the peripheral surface integrally with each other at an interval above and below each other. European Patent Publication No. 0278
Each of the notches in the lower ring has a blade at the bottom of the notch that projects vertically downward. Therefore, the blades of all the notches of this ring should be positioned tangentially to the horizontal annular line defined by the notch bottom surfaces of the other notches formed by being distributed over the entire ring peripheral surface. become. The spun yarn located between the underwine dig section and the cup winding is cut in the notch in the upper ring and the corresponding notch in the lower ring.
It is further turned along the edge of the notch in the lower ring.
Due to this deflection, which is carried out approximately perpendicular to the blade line, the thread is cut by this blade when the tube is pulled out of the spindle.

[0006]

The problem underlying the present invention is that a yarn cutting device of the type described at the outset is easy to manufacture and allows a reliable cutting of the yarn without rotation. It is configured as follows.

[0007]

SUMMARY OF THE INVENTION According to the present invention, there is provided, in accordance with the present invention, a member having a generally bowl-shaped configuration, and having a notched edge with an angle of about 45 DEG relative to the spindle axis.
The problem is solved by forming by pointing in the direction of the winding position at an inclination of about 65 °.

[0008] When preparing the doffed cup wound body after winding, the yarn is transferred from the cup wound body to the tube to form one of the notches in order to form an underwinding portion on the spindle. be introduced. When doffing the cup from the spindle, the thread is tensioned and drawn deep into the notch, the edge formed at the sharp end of the notch pointing in the direction opposite to the direction of the generated thread tension. I have. The cutting of the yarn is effected in the sharp end region of this cutout by the edges present on both sides of the yarn. As a result, all of the fibers that actually form the yarn are cut, and no tearing is performed. In actual tests, the function of the yarn cutting device according to the invention has been demonstrated even for yarns with a high tear strength.

With the arrangement according to the invention, the region formed as a blade at the edge of the cutout ends at a distance before the outer edge. This avoids the risk of injury to the operator coming into contact with the blade. Because the sharp blade is not exposed.

According to another embodiment of the invention, the edges of the notch transition into the outer edge with respective curved portions. Since the thread introduction portion is formed in a curved shape as described above, threading, that is, introduction of the thread into the cutout portion is reliably performed. In addition, this bend protects personnel from injury.

According to another configuration according to the invention, the notch has a zenith angle of about 20 ° to about 30 °. By forming the notch at this acute angle, the cutting action of the blade is improved. Furthermore, this acute angle prevents the operator from pinching his finger in the cutout.

According to another embodiment of the present invention, the member is formed in a substantially pot-like shape, and the member is covered with a cover except for an area of a notch. In particular, this cover, made of synthetic material, also protects personnel from injury due to contact with the blade.

According to another embodiment of the invention, the cover is a component of a ring which forms the tube housing and can be fixed to the spindle.

Further, according to the present invention, the ring is provided with another notch at an axial distance from the notch of the pot-shaped member, and the notch has a pot-like depth. At least approximately corresponds to the depth of the cutout of the member being cut.

The cover, which is the top of the lobe, has the same number of cutouts as the pot-shaped member, and these cutouts are present axially above the cutouts of this member. . However, the yarn moves in a spiral line from the cup winding to the top of the lobe and beyond the cutting member formed in a bowl shape to form an underwine dig section, so that the yarn is immediately Instead of penetrating into the notches situated one above the other, they penetrate into notches which are offset from one another in accordance with the spiral line.

According to another embodiment of the invention, the ring is formed as a means for fixing a pot-shaped member, by means of which the pot-shaped member is axially and circumferentially mounted on the spindle. Retained in the upper part. The lobe top holds a bowl-shaped cutting element on the ring collar above the spindle. For example, on the upper edge of the member formed in a pot shape,
A tongue is formed which engages inside the lobe top in the axial cutout and holds the lobe top circumferentially. In this way, the holding of the lobe top in the axial direction is performed, for example, by locking with the upper part of the spindle, for example, by a snap formed on the lobe top.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described in more detail with reference to an embodiment illustrated in the accompanying drawings, in which: FIG.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Each spinning or twisting machine has a number of spinning stations which are spaced from one another along at least one machine side in their longitudinal direction.
Each of these spinning positions is provided with a spindle, which is driven to wind the yarn supplied from the preceding spinning mechanism. Hereinafter, a spindle provided with a yarn cutting device according to the present invention will be described in detail with reference to the drawings, taking a spindle of a ring spinning machine as an example.

Such a spindle is essentially provided below the tube housing 2 on the spindle shaft 3 on which the extension 23 with the tube housing 2 is immovably mounted and on said extension 23. And the upper part 1 of the spindle with a working lobe 22. Spindle shaft 3
Are mounted in a spindle housing, not shown, which is held in a spindle rail which is rigidly connected to the frame of the ring spinning machine.

Tube housing 2 of spindle upper part 1
Serves for inserting a tube, and the yarn supplied from the draft mechanism is wound into a cup shape in the tube. The upper spindle part 1 is surrounded by a ring 4 concentric with its central axis 24, which ring is provided in a ring rail which carries out a lifting movement.

A traveler (not shown) rotates on the ring 4, and the traveler 10 winds the yarn 10 so that a cup is formed on the tube. The spindle 1 is driven by a tangential belt (not shown)
2 is carried out. A thread cutting device is provided in the region above the lobe 22 beside the transition to the tube housing 2. This yarn cutting device will be described in detail below. Below this thread cutting device, the worm 22 has a ring collar 5 with a notch.

In the ring spinning machine, a known automatic cup changing device is used for exchanging a cup after winding and forming with an empty tube. To prepare for this cup change, the ring rail is moved down relatively quickly from its upper turning point. Accordingly, the yarn 10 is wound on the cup at a steep pitch. The yarn 10 is wound on a notch in the form of a spiral having a narrow width at the height of the ring collar 5 to form an underwinding portion. Here, the ring rail remains at its lowest position, and the cup carrying the cup winding body is withdrawn to replace the cup. During this cup change, the yarn 10 is cut between the cup and the underwind dig in each of the spindles. This cutting is performed by a yarn cutting device described in detail below.

The yarn cutting device shown in FIGS. 1 to 3 comprises a cutting member 14 formed thin. The plate of this cutting member is in the form of a truncated cone and expands downward at an angle of 17, in particular 35 °, to the horizontal. The notch 11 formed symmetrically with respect to the radius extends from the outer edge of the cutting member 14 to the cutting member 14.
It is cut in the board. In the case of this embodiment, the cutting member 14 has twelve notches 11 formed integrally with the peripheral surface thereof. 2 and 3, these cutouts 11 are formed in a V-shape with an acute angle 18 of approximately 20 °. Each of the notches 11 has both edges sharply ground to form one blade 20. The blade is formed from the zenith 21 of the notch 11 toward the outer edge and ends shortly before the exit of the notch 11. Therefore, even if an operator contacts this blade, no injury is caused. Each of the edges of the notch 11 ends with a curved portion 19 in the direction of the outer edge. This bend facilitates, on the one hand, the introduction of the thread 10 into the cutout and, on the other hand, protects the operator from injury.

The end of the cutting member 14 opposite to the outer edge of the plate has a tongue 1 projecting upward in a crown shape.
6 is provided. The tongue has a substantially square or rectangular shape, and is formed integrally with the peripheral surface of the cutting member 14 at intervals. The entire cutting member 14 is stamped from a thin, in particular 0.4 mm thick, spring steel sheet. In order to form the notch 11 by shaving the blade 20, for example, grinding is performed. The edge is then ground until it reaches the area of the zenith 21.

The cutting member 14 has an annular shoulder 6 formed in the lobe 22 above the ring collar 5. The holding of this cutting element in the axial direction as well as in the rotational direction takes place on the one hand by the lobe top acting as cover 8. The tongue 16 of the cutting member 14 engages in the longitudinal groove 12 inside the annular cover 8 so that the cutting member is held on the cover 8 against rotation. In addition, the cover 8 has an inwardly projecting locking projection 13 which engages in an annular groove 7 formed around the worm 22 above the annular shoulder 6. Therefore, the cutting member and the cover 8 are held in the axial direction. The upper side of the cutting member 14 is covered by a cover 8 made of synthetic material, which in its lower area conforms to the frusto-conical shape of the cutting member 14 and thus the cover is Abuts integrally. Twelve notches 9 are formed in the area of the cover projecting in the direction of the tube housing 2 and formed as a crown-shaped ring and distributed integrally with its peripheral surface. The edge of the lower region of the cover 8 is likewise provided with cutouts 32 which are radially symmetrically inward from the edge of the cover 8 corresponding to the cutouts 11 of the cutting member. Oriented towards. The notch 32 is formed wider and deeper than the notch 11 so as not to impair the cutting action of the cutting member. The edge of the cover 8 is in particular overlaid with the edge of the cutting member 14, so that the worker does not come into contact with the cutting member and is not injured. The cutouts 9 in the upper region of the cover 8 are provided above these in the axial direction corresponding to the cutouts 32. These cutouts 9 serve to guide and turn the yarn 10 between the cup winding and the lower yarn tail. Since the yarn 10 spirally moves on the yarn cutting device between the cup winding and the lower yarn tail, the yarn does not enter into the notches 11, 32, 9 which are present above and below each other in the axial direction. , Into the notch 9 which is displaced relative to the notch 11 or 32 in accordance with the helix.

As soon as the thread 10 is tensioned by withdrawing the tube from the tube housing 2, the thread is drawn deep along the blade 20 into one of the notches 11,
While moving to the zenith part 21 of the notch part 11, it is gradually cut by the two blades 20.

The new empty tube is the upper part 1 of the spindle.
After being inserted into a new cup, molding of a new cup is started by restarting the spindle. To this end, the ring rail is quickly moved upward from its lowest position to the lower region of the tube, and the yarn 10 is wound on the tube and formed into a cup base. Therefore, the thread 10 still fixed on the lower thread tail is guided again over the cutting member and the cover at a steep pitch. The yarn 10 is cut after the start of spinning, and the unwinding portion is removed from the notch of the ring taller 5,
A residual yarn removing device 15 is provided at each of the spinning positions, and the residual yarn removing device is movable in the direction of the ring collar 5 by means not shown. The residual yarn removing device 15 penetrates into the hollow space formed by the pot-like shape of the cutting member 14 below the annular shoulder 6, and cuts the tensioned yarn 10 there. The remaining yarn removing device 15 is further pressed against the notch in the ring collar 5, thereby releasing the lower yarn tail.

The cutting member 25 according to another embodiment shown in FIGS. 4 and 5 has eight double notches 28 formed so as to be distributed over the entire peripheral surface. Each of these double notches 28 is likewise provided on the outer edge 27 of the plate 26.
, Two single cutouts are formed, the centerlines of which are mirror-symmetric with respect to the radius of the spindle axis. Depending on the S-twist or Z-twist rotation of the spindle, a notch oriented in one circumferential direction or a notch oriented in a different circumferential direction is used. Each of these single notches has a front edge 29 and a rear edge 31. These edges are sharply opposed to each other and form an acute angle zenith 30.

In another embodiment, not shown, a cover made of synthetic material into which a metal strip is inserted serves as a thread cutting device. Although not described here, a separate cutting member can also be used. Similarly, the bowl-shaped cover, which is formed as a truncated cone, is provided with a V-shaped notch which is directed symmetrically radially inward from the outer edge with respect to the spindle axis. ing. On both sides of the cutout, sharply ground thin metal sheet pieces are provided which project into the cutout and overlap in the region of the zenith of the cutout. These metal strips are, for example, screwed to the cover or inserted into slits formed along the edge at the height of the notch in the board. It is also possible to clamp the above-mentioned metal sheet by means of a clamping part which is detachably connected to the cover. In this way, a notch is formed which forms a very sharp edge.

According to FIGS. 6, 7 and 8, the cutting member is formed from two jackets and is provided with a notch according to FIGS. Jackets 32 and 33
Are displaced from each other, so that the edges 34 and 35 of the notches intersect each other. The edges of the two jackets 32, 33 are advantageously ground in this case in such a way that they overlap at the intersection 36 without spacing. At this time, unlike the configuration shown in the figure, each of the cutouts needs to have only one sharp edge that does not need to be sharpened to the top of the cutout. This facilitates the production of the cutting member and sharpening of the edges and reduces the costs involved.

[0031]

As described above, according to the present invention, when exchanging a finished cup for a new tube, any thread, thick or thin, is reliably cut, thereby replacing the cup. The doffing work is performed without any trouble.

[Brief description of the drawings]

FIG. 1 shows the spindle half-cut so that it can be clearly seen that the thread cutting device with a pot-shaped element is held at the top of the lobe serving as a cover in the upper part of the spindle. It is.

FIG. 2 shows a half of the cutting member according to FIG. 1;

FIG. 3 is an enlarged plan view showing a part of the cutting member shown in FIG. 2;

FIG. 4 is a view illustrating a half portion of a cutting member according to another embodiment.

FIG. 5 is a plan view of the embodiment according to FIG. 4;

FIG. 6 is a view of another embodiment of a cutting edge.

FIG. 7 is a view of another embodiment of a cutting edge.

FIG. 8 is a view of another embodiment of a cutting edge.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spindle upper part 2 Tube accommodating part 3 Spindle shaft 4 Ring 8 Cover 9, 11, 32 Notch 10 Thread 14, 25 Cutting member 16 Tongue 17 Cutting member mounting angle 20 Blade 21, 30 Zenith 22 Warb 23 Extension 24 Spindle center axis line 26 Cutting member plate 27 Outer edge portion 28 Double notch portion 29, 31, 34, 35 Edge 32, 33 Jacket

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Joachim Wolmershausel, Heimeldeingen, Germany, Wieseneckelstraße, 37 (56) References JP-A-55-132722 (JP, A) U.S.A. 63-295726 (JP, A) U.S.A. 63-78078 (JP, U) U.S.A. 55-789 (JP, U) U.S. Patent 3,530,657 (US, A) U.S. Patent 3,967,440 (US, A) West Germany Patent application publication 3202888 (DE, A1) (58) Fields investigated (Int. Cl. ⁶ , DB name) D01H 9/16 D01H 1/38

Claims (10)

(57) [Claims] An annular member is provided between the tube receiving portion of the spindle and a winding position of the spindle for fixing the spun yarn, and has an edge projecting radially from the spindle. A spinning or twisting machine of the type in which the annular edge is provided with a number of notches which are sharply directed inward and the edges of which are formed as blades. Wherein the member (14) has a generally bowl-like shape and the edge with the notch (11) is about 45 ° to about 45 ° with respect to the spindle axis (24). A yarn cutting device for a spindle of a spinning machine or a twisting machine, characterized in that it is directed in the direction of the winding position (5) at an inclination of 65 °. The member (14) is formed in an annular, bowl-like shape.
2. The thread cutting device according to claim 1, wherein the thread is formed of a thin plate made of spring steel. The blade (20) at the edge of the notch (11)
2. The yarn cutting device according to claim 1, wherein the region formed as a pattern ends at a distance before the outer edge. 04. The yarn cutting device according to claim 1, wherein the edges of the cutouts (11) transition to the outer edges with respective curved portions (19). The notch (11) has an angle of about 20 ° to about 30.
5. The yarn cutting device according to claim 1, wherein the yarn cutting device has a zenith angle of 18 degrees. 06. The device as claimed in claim 1, wherein the substantially bowl-shaped member is covered with a cover, leaving the area of the notch. Or one thread cutting device. [07] The cover (8) is a tube accommodating portion (2).
7. The thread cutting device according to claim 6, wherein the ring cutting device is a component of a ring which forms a ring and can be fixed to a spindle. [08] A notch (9) is provided at an axial distance from the notch (11) of the member (14) in which the ring is formed in a bowl shape, and the depth of the notch is provided. Notch (11) of member (4) formed in a bowl shape
8. The yarn cutting device according to claim 7, wherein the yarn cutting device at least approximately corresponds to the depth of the yarn. [09] The ring is formed as a means for fixing the pot-shaped member (14), whereby the pot-shaped member (14) is axially and circumferentially mounted on the spindle. 8. The yarn cutting device according to claim 7, wherein the device is adapted to be held by an upper part. 10. A member (14) comprising two jackets (3).
2, 33), the cutouts of these jackets each having one edge (34;
10. The method according to claim 1, wherein the first and second jackets are offset from one another so as to form a sharp edge (36) with the oppositely oriented edge of the other jacket. One thread cutting device.