JPH07216694A - Cutting tool for textile machine for organization of stitch - Google Patents

Abstract

PURPOSE: To improve a cutting tool for a textile machine for stitch knitting so as to obtain a long life time and neatly cut threads. CONSTITUTION: The cutting tool is intended for the textile machine for stitch knitting, particularly for manufacturing plush products, and is provided with a body part 1 and at least one cutting part 7 formed in this body part. This cutting part has cutting edges 90, 91 with sharp edges of a prescribed length formed in the wedged range 11. These cutting edges are formed in a corrugated shape over at least one portion of the length.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a cutting tool for a textile machine for knitting, in particular for making plush products, which comprises a stem and at least one cutting portion formed in the stem. This type of cutting section has a sharp cutting edge of a blade ground in a wedge-shaped cross section.

[0002]

2. Description of the Related Art When a so-called cutting plush product is produced on a knitting machine, it is known to cut the fluff that is pulled out in a loop shape directly on the knitting machine with an appropriate cutting tool. For this purpose, for example, West German Patent No. 1153482
The specification describes a circular knitting machine for making plush products.

In this known circular knitting machine, a plush sinker is inserted into the guide groove of the dial, and the plush thread is lowered by the tongue needle guided in the needle cylinder through the plush sinker. Each plush sinker supporting one control bat cooperating with a dial cam is provided with a cutting part formed as a kind of additional part.

The cutting part has an inwardly adjusted cutting edge, which is arranged in its own position in order to cut the plush thread after withdrawing the nap. Cooperates with the outwardly adjusted cutting edge of the sinker. Such so-called plush cutting knives are known in practice in many configurations, as are so-called plush cutting needles which additionally have a needle head at the cutting part.

Except for the production of cut plush products, in the context of textile machines for knitting knitting is often another relevance,
The need arises that individual threads must be cut during the knitting process.

Therefore, for example, the West German Patent Application Publication No. 2
From 003301 there is known a circular knitting machine for stockings or the like for making a notch in a tubular product piece in the longitudinal direction, the circular knitting machine being arranged in a guide groove of a needle cylinder. Work with the cutting needle inserted.

The trunk of the cutting needle, which is designed as a tongue needle, has a cutting portion in the rear region of the needle head, which cutting portion has a sharp cutting edge of a ground blade. By this cutting edge, it is possible to cut the stitches suspended by the needle by pushing the needle to the cutting position while forming the product piece portion, and in the product piece, the stitch row made by the special needle is cut. A cut is made along.

Furthermore, cutting tools of the above type can be used for jacquard machines, yarn strippers, when it is important to cut individual threads during the knitting process.
Also used in etc.

In this case, in order to improve the quality of the product, it is extremely important to cut the yarn sufficiently and cleanly at the cutting point. For example, in a yarn composed of endless filaments, there is a fear that a knitting error occurs when individual filaments are not cut.

When processing yarns made of plastic fiber material, the cutting edge is subjected to a relatively high load, which adversely affects the service life of conventional cutting tools. Moreover, it takes a considerable amount of time to replace the cutting sinker or the cutting needle in the knitting machine, and accordingly, the production loss occurs.

[0011]

SUMMARY OF THE INVENTION The object of the present invention is to improve a cutting tool for a textile machine for knitting of the type mentioned at the outset, so that a long service life is obtained and at the same time the thread can be cut cleanly. To do.

[0012]

The object of the invention is solved in a cutting tool of the type mentioned at the outset by the fact that the cutting edge is corrugated over at least part of its length. .

[0013]

As compared with known plush cutting knives and plush needles with straight cutting edges, the cutting length is consistently linear, that is, the cutting length is provided by the corrugated grinding section. Is enlarged.

The periodic peaks and troughs of the cutting edges in the corrugations significantly improve the cutting conditions, as can be seen from practical experience, while at the same time compared to known cutting tools with straight grinding. As a result, the service life is partially increased by 6 to 10 times.

In this connection, it is well known that hand knives or picks etc. are provided with a corrugated grinding part, but the conditions corresponding to this type of tool are only for the following reasons: the plush. It cannot be diverted without difficulty into cutting sinkers or needles for the production of plushes simply because the cutting knives and the plush cutting needles have comparatively very small dimensions and thus have limited lateral stability. The cut fibers of threads or yarns are extremely fine without exception.

The wedge-shaped area of the cutting portion of the cutting tool according to the invention is generally provided on at least one side with a corrugated grinding portion having an axially parallel valley extending substantially perpendicular to the corrugated cutting edge. At the same time, the troughs protect sharp cutting edges against external mechanical action.

In a preferred arrangement, the valleys extend at an acute angle of 10 ° to 30 °, preferably 15 °, with respect to a plane containing the longitudinal axis of the trunk or a plane parallel to the longitudinal axis of the trunk, which extends through the cutting edge. Is done.

The essentially wedge-shaped cutting section can be provided with a corrugated grinding section having such troughs on each side of the cutting edge. However, in an advantageous configuration, the wedge-shaped area of the cutting part is provided on one side with a smooth grinding part having a substantially flat grinding surface.

The substantially flat grinding surface of the smooth grinding section is preferably approximately 1 plane with the longitudinal axis of the trunk extending parallel to the longitudinal axis of the trunk extending through the cutting edge.
It forms an acute angle of 0 to 30 degrees, preferably 13 to 15 degrees.

In the case of a cutting needle, the cutting part of which has a corrugated grinding section on one side and a linear grinding section on the other side in the area of a wedge in cross section, in a practical construction The wedge angle is approximately 28 degrees.

The line tangent to the corrugated cutting edge, the so-called envelope, is simply a straight line, but it may also be curved concavely (sickle) or convexly. Said line preferably makes an acute angle with the longitudinal axis of the trunk, whereby a tensile cut is obtained.

Normally, tensioned threads are cut only by the relative movement between the thread and the cutting edge of the cutting tool. However, it is also known in connection with the construction of knitting machines to arrange the cutting part of the cutting tool in cooperation with a stationary corresponding knife.

The corresponding knife can be provided with a straight grinding section or likewise with a corrugated grinding section in the range of the cutting edges, so that in the former case there is a straight linear corresponding cutting edge and in the latter case. Corresponding cutting edges of the waveform are obtained.

The cutting edges of the cutting tool and the corresponding cutting edges of the corresponding knives are shaped such that they cooperate like a pinch. Correspondingly, the cutting tool and the corresponding knife are also constructed as described in detail.

[0025]

DETAILED DESCRIPTION OF THE INVENTION The illustrated cutting needle is used to make a cutting plush on a circular knitting machine. The cutting needle has a stamped stem 1, on the upper side of which three control bats 2, 3, spaced apart from one another for cooperating with the knitting cam parts in a known manner are provided. 4 are provided.

At the front end of the needle stem 1, there is formed a circular knitting hook or a splicing knitting hook (Plattierhaken) 5 having a circular cross section which is crushed laterally or internally or laterally and internally. Can be tapered taper towards the frustoconical hook tip if desired.

Subsequent to the hook 5, a substantially triangular cut portion 7 is formed on the needle stem 1, and the upper surface of the cut portion 7 has an edge extending obliquely upward in the direction of the needle stem end from the hook base portion 8. Bounded by 9, this edge makes an acute angle with the longitudinal axis 10 of the stem, which in the illustrated embodiment is 20 degrees (see FIG. 3).

As is particularly apparent from FIG. 4, the cutting portion 7 has a strip-shaped cross-section wedge-shaped region 11 on the upper edge side, which region 11 corresponds to a sharply ground edge 9 of the blade. It is formed to be tapered. A region 11 having a wedge-shaped cross section extends from the rear end 12 of the cutting portion 7 near the hook 5 and almost to the back of the needle stem (see FIG. 3).

Over most of its length, the edges 9 are
Is corrugated, starting somewhat below the upper edge of the. In this case, a straight cutting edge 91 extending to the end 12 of the cutting portion 7 is connected to the corrugated cutting edge 90, as is apparent from FIG.

The corrugated cutting edge 90 is axially parallel to the corrugated cutting edge 90 and extends substantially perpendicularly to the corrugated cutting edge 90 on one side, ie on the side shown in FIG. It is formed by providing a so-called corrugated grinding portion having a groove-shaped valley portion 13, and in this case, the valley portion 1
3 cooperates with the crests located between the troughs to produce a substantially sinusoidal shaped shape.

On the opposite side, the cross-section wedge-shaped region 11 of the cutting part 7 is provided on one side with a smooth grinding part having a substantially flat grinding surface 14, said grinding surface 14 on the other side. A corrugated cutting edge 90 is defined in cooperation with the corrugated grinding portion.

Basically, instead of a linear grinding part in the area of the grinding surface 14, a corrugated grinding part can likewise be provided in this region, in which case the troughs of this corrugated grinding part are replaced by troughs 13. Can be formed similar to the above and may be offset with respect to the valley 13 in the longitudinal direction of the cutting edge.

In the region 11 having a wedge-shaped cross section, the troughs 13 and / or the crests located between the troughs are cutting edges 90, 9.
A plane 15 extending through 1 and including the longitudinal axis 10 of the needle stem 1.
Alternatively, it is ground so as to form an acute angle with a plane 15 parallel to the longitudinal axis 10 of the needle stem 1. In this case, the acute angle is in the range of 10 to 30 degrees, but in the present embodiment, the angle indicated by reference numeral 16 is 15 degrees.

The plane 15 likewise makes an acute angle with the linear grinding surface 14 on the other side in the range 10 ° to 30 °. This angle is designated 17 (see FIG. 4) and is 13 degrees in the illustrated embodiment. This yields a wedge angle of 28 degrees in this embodiment in the area 11 of wedge-shaped cross section, where the apex of the wedge angle coincides with the cutting edge.

In the illustrated embodiment, the line tangent to the corrugated cutting edge 90, which is considered an extension of the straight cutting edge, is a straight line inclined at an angle of 20 degrees with respect to the longitudinal axis 10 of the needle stem. Further, an embodiment in which the contact line is curved concavely or convexly is possible. In connection with the construction of the cutting tool shown in the prior art as mentioned at the outset, the cutting edge can be oriented parallel or approximately at right angles to the longitudinal axis of the stem.

If it is desired to symmetrically cut the hairy foot into two parts of exactly the same length, the cutting edge 9 is preferably used.
A cutting tool with 0, 91 lying in the central plane 15 is used.

In the embodiment shown in FIGS. 1 to 4, the cutting needle cuts the tensioned thread only by the relative movement between the thread and the cutting edge 90 of the cutting needle. In connection there are also possible embodiments in which the cutting tool cooperates with the corresponding knife in the form of a pinch.

In this case, the cutting tool should be constructed as a cutting needle with a hook 5 similar to that of FIGS. 1 to 3, or as a cutting sinker without such a hook or as a general cutting knife. You can Such an embodiment is illustrated in FIGS. 5 and 6.

In FIGS. 5 and 6, "a" is added and the same components as those in FIGS. 1 to 4 are designated by the same reference numerals, and therefore, duplicated description is omitted in this respect. .

A cutting tool 19 configured as a hookless cutting sinker with a stem 3a cooperates with a corresponding knife 20. The edge of the corresponding knife facing the edge 9a of the cutting tool is provided on the side opposite to the cutting portion 7a with a strip-shaped cross section wedge-shaped area 110, which area is usually at least the length of the corrugated cutting edge. It extends all the way.

The region 110, which is wedge-shaped in cross-section, is provided with groove-shaped troughs 130 parallel to the axis which extend substantially at right angles to the cutting edge 900 of the wavy corrugation, which troughs lie between the troughs. In cooperation with the crests, a forming shape corresponding to the corrugated grinding part is produced. The cutting part 7a and the corresponding knife 20 are provided with flat surfaces 21 and 22 parallel to each other on the opposite sides (see FIG. 6), and these surfaces 21 and 22 are subjected to elastic biasing force as in the case of the sandwiching. Touch each other at.

The cutting tool 19 normally reciprocates in the horizontal direction as seen in FIG. 5, but it can also be arranged stationary in the individual case. Corresponding knife 20 accordingly
Can likewise reciprocate relative to the cutting tool 19, but the counter knife can carry out a pivoting movement or a combined pivoting and parallel movement, and only the counter knife is stationary and Embodiments in which only the cutting tool moves are also possible.

However, in each case the cutting edges 90a and in some cases 91a and 900 cooperate with each other.
A pinch-shaped cutting movement is generated between them. Furthermore, the counter knife 20 can also have a straight cutting edge 900 in each case.

The angle formed by the faces on either side of the cutting edge forming the cutting edge 90a or 900 is 28 degrees in the illustrated embodiment. Moreover, this angle can be very large, for example 70 degrees or a limit of 90 degrees, depending on the requirements of the individual case in each case. In this case, it is not necessary for the cutting tool to have the same value as the corresponding knife 20.

The cutting needles or cutting tools (and possibly corresponding knives) are made of suitable spring-elastic steel. The cutting parts 7, 7a are hardened in the region of the cutting edges 90, 91 or 90a, 91a or 900 and optionally additionally heat treated, for example wear-resistant coated.

[Brief description of drawings]

1 is a side view of a cutting tool of the present invention as a so-called cutting needle.

FIG. 2 is a plan view of the cutting needle of FIG.

FIG. 3 is an enlarged side view of a part of a needle head and a cutting portion of the cutting needle of FIG.

FIG. 4 is an enlarged cross-sectional view of the cutting needle taken along line IV-IV in FIG.

FIG. 5 is a partial side view of a cutting tool and a corresponding knife associated therewith.

FIG. 6 is an enlarged cross-sectional view taken along line VI-VI in FIG.

[Explanation of symbols]

 1 Trunk 7 Cutting part 10 Longitudinal axis 11 Wedge range 13 Valley 14 Grinding surface 15 Plane 20 Corresponding knife 21,22 Surface 90,91,90a, 900 Cutting edge

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Claims (13)

[Claims] 1. Especially for making plush products,
A cutting tool for a textile machine for stitch knitting, comprising a trunk portion and at least one cutting portion formed on the trunk portion, the cutting portion having a sharp predetermined length of a blade formed in a wedge-shaped area. Textile machine for knitting, characterized in that the cutting edges (90, 91) are corrugated over at least a portion of their length Cutting tools for. 2. A corrugated cutting edge (9) with at least one wedge-shaped cross section (11) of the cutting portion (7).
0) Valley portion (13) extending substantially at right angles to and parallel to the axis
The cutting tool according to claim 1, further comprising a corrugated grinding portion having a. 3. The area (11) of the cutting section (7), which is wedge-shaped in cross section, is provided on one side with a smooth grinding surface with a substantially flat grinding surface (14). Cutting tool. 4. The valley (13) extends parallel to the plane (15) containing the longitudinal axis (10) of the trunk (1) or extending through the cutting edge (90) or said longitudinal axis (10). 3. A cutting tool according to claim 2, which makes an acute angle with the plane (15). 5. The cutting tool according to claim 4, wherein the acute angle is 10 to 30 degrees, preferably 15 degrees. 6. A substantially flat ground surface (1) of a smooth ground portion.
4) a plane (15) comprising the longitudinal axis (10) of the trunk (1) extending through the cutting edge (90, 91) or a plane (15) extending parallel to said longitudinal axis (10) 4. The cutting tool according to claim 3, wherein the cutting tool forms an acute angle (17). 7. A cutting tool according to claim 6, wherein the acute angle (17) is between 10 and 30 degrees, preferably between 13 and 15 degrees. 8. The cutting tool according to claim 1, wherein the line tangent to the corrugated cutting edge (90) is a straight line. 9. The line according to claim 1, wherein the line contacting the corrugated cutting edge (90) is concavely or convexly curved.
The cutting tool according to claim 1. 10. The cutting tool according to claim 1, wherein the line tangent to the cutting edge (90, 91) forms an acute angle with the longitudinal axis (10) of the trunk (1). 11. Cutting according to claim 1, wherein the cutting portion (7) is at least in the region of a wedge-shaped cross section and is additionally provided with an anti-wear treatment, for example a coating. tool. 12. A cutting knife is associated with the cutting tool, the corresponding knife being arranged to cooperate with a cutting tool of the pinch type, the cutting tool and the corresponding knife (2).
Cutting tool according to any one of claims 1 to 11, characterized in that 0) are provided with flat surfaces (21, 22) on opposite sides. 13. The cutting edge (9) of the corresponding knife (20).
Cutting tool according to claim 12, wherein 00) is also corrugated over at least part of its length.