DE202016100026U1 - Cutting device for cutting thread-like materials - Google Patents

Abstract

Cutting device (1) for cutting a strand of material (9), in particular a thread-like element, preferably a thread, a cord or a rope, with at least one holding element (2), in which a clamping channel (8) for receiving the material strand (9) is, with at least one cutting edge (6, 6 ') which is arranged movably in the holding element (2) and in the clamping channel (8) for cutting the material strand (9) can be inserted, characterized in that the clamping channel (8) has a recess (10) and the material strand (9) within the recess (10) of the clamping channel (8) freely, that is without contact with the clamping channel (8) is feasible and by the at least one cutting edge (6, 6 ') in this recess (10) is einschneidbar.

Description

The invention relates to a cutting device for cutting a strand of material, in particular thread-like elements, preferably a thread, a cord or a rope, with at least one holding element, in which a clamping channel is formed for receiving the material strand, with at least one cutting edge in the Holding element is arranged movable and can be inserted into the clamping channel for cutting the material strand.

Such a cutting device is from the FR 2 824 919 known. Described is a cutting device for cutting glass fiber strands. The cutting device has a holding element with a clamping channel in which a glass fiber strand is guided. In the interior of the holding element, a cutting edge is arranged. The cutting edge cuts into the fiberglass strand. To ensure a clean cut, a spring arrangement is provided at the incision site opposite the cutting edge. The spring assembly presses during the cutting the glass fiber strand against the cutting edge.

From the US 2009/0012560 A1 Another cutting device is known. The cutting device serves to provide threads, for example for medical purposes, with regularly arranged incisions. A blade cuts a thread fixed by the holding blocks in the area of the holding blocks. In this case, the blade opposite holding block serves as an abutment to allow a clean cut.

Another cutting device is from the WO 2011/139916 A2 known. In this device, a thread between a two-part holding element and a spring element is clamped. A blade then cuts into the fixed thread. Again, the retaining element serves as an abutment.

From the KR 10 1 391 812 B1 is a cutting device without an abutment known. In this cutting device, however, it is necessary to put a material to be cut under tension, since the cut material has to span a relatively wide free area.

From the prior art, it is therefore known, for cutting thread-like materials to deposit the material to be cut on a cutting counter block. On the opposite side of the cut counter block the material is cut with a cutting blade. The cut material is stabilized by the cut counter block and the cut can be performed clean. Another cut can be made after further transport and / or rotation of the material and / or the cutting device. If the material is to be cut, in particular, at two opposite points, therefore, the material must be rotated by 180 ° about its own axis or the cutting device must be moved by 180 ° about the axis of the material. Due to the flexibility of the commonly used material and the play of moving components, therefore, there is usually an offset of the two sections in the axis of rotation and the longitudinal direction of the material. This results in a reduced quality of the product. Also, subsequent production processes can be negatively influenced.

Cutting devices with a cutting counter block thus often allow only incisions with low precision and repeatability. In addition, in the known solutions usually the material must be cut under tension to fix the material sufficiently for the cut. This can lead to a rupture of the material.

Object of the present invention is therefore to further improve a cutting device for cutting thread-like materials. In particular, reproducible precise cuts are to be made possible. The risk of tearing the thread-like material should also be reduced.

The object is achieved by a cutting device for cutting a strand of material, in particular thread-like elements, preferably a thread, a cord or a rope, with at least one holding element in which a clamping channel is formed for receiving the material strand, with at least one cutting edge in the Holding member is arranged movable and in the clamping channel for cutting the material strand is inserted, wherein the clamping channel has a recess and the material strand within the recess of the clamping channel freely, d. H. can be guided without contact with the clamping channel and by the at least one cutting edge in this recess can be cut.

In this cutting device, it is possible to introduce a strand of material in the clamping channel. Along the clamping channel of the material strand is fixed with the exception of the recess through the clamping channel. Within the recess, the material strand is guided freely. In other words, the clamping channel surrounds the material strand, wherein the material strand does not touch the clamping channel within the recess. Due to the inherent strength and rigidity of the material strand of the material strand remains rigidly aligned within the recess. Especially if the recess has a small extent in the longitudinal direction of the material strand, for example in the order of the diameter of the material strand, it requires for cutting no opposite, touching the material strand cutting cross-section block. An incision can thus be made without cutting counter block. Since the material strand also does not have to be put under tension during cutting, unilateral and also deeper cuts can be made than previously. Also, strains or similar deformations of the material strand are avoided. Sections can therefore be placed more precisely within the material strand.

It is particularly advantageous if the holding element has two complementary formed and between an open and a closed position mutually movable cutting block units, wherein in each of the cutting block units a groove is formed and these grooves together form the clamping channel in the closed position of the cutting block units. Thus, in each case a cutting block unit, one half of the clamping channel is formed in its longitudinal direction. By moving the cutting block units apart, the clamping channel can be opened and a strand of material can be introduced into the clamping channel. Then the clamping channel can be closed and an incision made. For this purpose, the grooves preferably have a cross section corresponding to the desired shape of the clamping channel. It is particularly preferred to form the grooves with a semicircular cross section. In alternative embodiments, it may also be provided to make the grooves of polygonal cross-section, for example V-shaped. It is understood that within the recess, the cross section of the grooves may differ from the design of the cross section of the grooves in the areas outside the recess. Thus it can be achieved that the Materlalstrang is freely feasible within the recess of the clamping channel. In other words, it can thus be achieved that the material strand within the recess of the clamping channel does not touch the walls of the clamping channel or the two grooves.

Preferably, a guide for a cutting edge may be formed in each of the cutting block units. This makes it possible to attach two cuts that are opposite, at the same time or almost simultaneously or offset in time on the material strand. In this case, the two incisions can be positioned particularly accurately relative to one another as well as with respect to the material strand. If, in particular, opposing incisions are to be achieved, then these incisions may have a particularly small offset from one another. In particular, it becomes possible to perform cuts with an offset of only a few thousandths of a millimeter.

The guides can advantageously form the recess of the clamping channel. This results in a structurally simple embodiment of the cutting device.

It is also advantageous if the cutting block units are displaceable relative to one another in the longitudinal direction of the clamping channel. This makes it possible to align the cutting block units with high precision to each other. As a result, an offset of incisions, for example opposite incisions, can be reduced or set to a desired level.

A further advantage results if at least one cutting block unit has a coolant and / or heat medium guide. As a result, the cutting block unit can be tempered as needed. For example, when a coolant is supplied, the cutting block unit may be cooled during the cutting. As a result, the power of the cutting device, in particular the frequency with which cuts can be made, can be increased substantially. Depending on the material properties of the material strand, it may also be advantageous if a heating agent is supplied. As a result, the material strand can be brought to a temperature at which the material strand has a flexibility and / or hardness suitable for the incision. For this purpose, the cooling and / or heat supply can be designed, for example, as cooling plates, as a liquid channel system, as hot air heating, electric heating or the like.

It is also particularly advantageous if the cutting guides have a coating or a Gleitfluidzuführung. For this purpose, a coating can be provided at least in a region of the surface of the cutting guides. As lubricating fluid, for example, a lubricating oil or an air flow forming an air cushion can be provided. As a result, the friction of the cutting edge on the cutting guide can be reduced. This results in less frictional heat during use of the cutting device. It can thus improve durability and energy efficiency of the cutting device.

Likewise, the clamping channel may have a coating or a Gleitfluidzuführung. As a result, further transport of the material strand before and / or after cutting can be facilitated.

It is also advantageous if in at least one of the cutting block units a plunger for Replacement of the material strand is arranged movable from the clamping channel. This makes it possible, in particular when the clamping channel is opened, to detach the material strand from the clamping channel with the aid of the plunger. As a result, the material strand can be transported even easier. Damage to the material strand can be avoided.

Furthermore, it is advantageous if a wall of the clamping channel has a structured surface which increases the clamping action, at least in one area. Such a structured surface can preferably be formed with elevations and recesses, for example in a regular arrangement. As a result, on the one hand, it can be achieved that, with the clamping channel closed, the material strand is even better fixed by the clamping channel. It can also be achieved that, with the clamping channel open, the material strand can be detached more easily from the clamping channel.

It is particularly advantageous if the extent of the recess in the longitudinal direction of the clamping channel is between 0.05 mm and 2 mm. This can ensure that the material strand in the recess in which it is guided freely, has a sufficient rigidity. It can then be dispensed with a tense arrangement of the material strand during cutting. Thus, a high quality of cuts can be guaranteed.

It is particularly advantageous if the at least one cutting edge is movable transversely to its cutting direction. This can be achieved in a simple manner by suitable dimensioning of the cutting guide. This allows the cutting edge to perform a two-dimensional movement. In particular, the cutting edge can be moved in an oscillating manner. This can improve cutting performance and cutting speed. Incisions are made at different locations along the cutting edge. Thus, the cutting edge is used not only punctually but along part of its width. The service life of the cutting edge and thus the length of maintenance intervals for replacing the cutting edge lengthen.

Further features and advantages of the invention will become apparent from the following detailed description of the embodiments of the invention, with reference to the figures of the drawing showing essential to the invention, and from the claims.

The various features may be implemented individually for themselves or for a plurality of combinations in variants of the invention.

Show it:

1 a schematic representation of a cutting device with an open clamping channel in a perspective view;

2 the cutting device as in 1 in closed condition;

3 an enlarged detail of a longitudinal section through the device according to 2 ,

1 shows an embodiment of the cutting device 1 , The cutting device 1 has a retaining element 2 on, consisting of two substantially symmetrical cutting block units 3 . 3 ' is formed. Each cutting block unit 3 . 3 ' has a first sub-block 4 . 4 ' and a second sub-block adjacent thereto 5 . 5 ' on. The first subblock 4 . 4 ' is from the second subblock 5 . 5 ' spaced. The gap formed thereby forms a cutting guide 11 . 11 ' , In the cutting guide 11 . 11 ' is a cutting edge 6 . 6 ' arranged. The cutting edge 6 . 6 ' is inside the cutting guide 11 . 11 ' movable. The cutting block units 3 . 3 ' each have a contact surface 12 . 12 ' on. The two cutting block units 3 . 3 ' are arranged symmetrically to each other. With the aid of a displacement arrangement, not shown, the two cutting block units 3 . 3 ' be moved towards each other or spaced from each other. Thus, the two cutting block units can 3 . 3 ' in a closed state at their contact surfaces 12 . 12 ' touch. In an open state, however, are the contact surfaces 12 . 12 ' spaced apart.

In the contact areas 12 . 12 ' is in each case an extending in the direction L groove 7 . 7 ' educated. In the illustrated embodiment, the grooves 7 . 7 ' formed in a straight line and at corresponding locations in the contact surfaces 12 . 12 ' arranged. Be the contact surfaces 12 . 12 ' therefore brought into contact, complement the two grooves 7 . 7 ' to a clamping channel 8th , Are the contact surfaces 12 . 12 ' spaced apart, is the clamping channel 8th severed lengthwise, so that a strand of material 9 can be inserted into it.

Essential to the invention is that the clamping channel 8th in the area of the cutting guide 11 . 11 ' a recess 10 which is formed here by the cutting guides. It is understood that the resulting in the cutting area recess 10 may also be formed enlarged in addition. Is thus a strand of material 9 in the clamping channel 8th inserted and the cutting device is closed, then the material strand 9 over the entire length of the clamping channel 8th enclosed by this, with the exception of Klemmkanalausnehmung 10 ie, with the exception of a cutting area between the cutting guides 11 . 11 ' and the clamping channel 8th , In this Klemmkanalausnehmung 10 is the material strand 9 also with closed clamping channel 8th free and contactless. The length of the Klemmkanalausnehmung 10 but it is very low. In essence, it is through the thickness of the cutting 6 . 6 ' or the cutting guides 11 . 11 ' as well as the diameter of the clamping channel 8th certainly. This results in that the material strand 9 although he is in the Klemmkanalausnehmung 10 runs freely and is not under tension, has a sufficiently high intrinsic strength and rigidity. Thus, the cutting edges 6 . 6 ' each through the cutting guides 11 . 11 ' led into the material strand 9 penetrate and cut into a predefined penetration depth. In the example shown, the cutting guides 11 . 11 ' or the cutting edges 6 . 6 ' with respect to the longitudinal direction L of the clamping channel 8th inclined by approx. 45 °. Thus, an oblique incision at a 45 ° angle results in the material strand 9 , This angular position can be varied depending on the desired incision pattern.

In the embodiment according to 1 are the grooves 7 . 7 ' each semicircular in cross section. Thus, when the cutting device is closed, a substantially circular cross-section of the clamping channel results 8th , The walls of the grooves 7 . 7 ' are provided with a structured surface. The textured surface of the grooves 7 . 7 ' has regularly arranged surveys. That's where the material strand comes from 9 only selectively along these elevations in contact with the clamping channel 8th or the grooves 7 . 7 ' , This improves when the cutting device is closed 1 the fixation of the material strand 9 in the clamping channel 8th , When the cutting device is open 1 facilitates this structuring also a detachment of the material strand 9 from the terminal channel 8th or from the grooves 7 . 7 ' ,

In 2 is the cutting device 1 out 1 shown in closed condition. The blades 6 . 6 ' are shown as being in the material strand 9 cut in at the same time. However, it is equally possible to cut 6 . 6 ' to move at different times. Then cuts are made in the material strand 9 from opposite sides at different times. The two incisions are not or only slightly to each other in the longitudinal direction L of the clamping channel 8th added. If a larger offset is desired, then the cutting block units 3 . 3 ' relative to each other relative to the longitudinal direction L slidably disposed. Thus, the cutting positions of the cutting blades can 6 . 6 ' in the material strand 9 be coordinated with each other.

In 3 is an enlarged detail of a longitudinal section through the closed device through the clamping channel 8th to see. Clearly visible is the Klemmkanalausnehmung 10 , It is between the cutting guides 11 . 11 ' educated. In the cutting guides 11 . 11 ' are the cutting edges 6 . 6 ' arranged.

LIST OF REFERENCE NUMBERS

1

cutter

2

retaining element

3, 3 '

Cutting block unit

4, 4 '

first subblock

5, 5 '

second subblock

6, 6 '

cutting edge

7, 7 '

groove

8th

clamping channel

9

material strand

10

Clamping channel recess

11, 11 '

cutting guide

12, 12 '

contact area

L

longitudinal direction

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• FR 2824919 [0002]
• US 2009/0012560 A1 [0003]
• WO 2011/139916 A2 [0004]
• KR 101391812 B1 [0005]

Claims (13)

Cutting device ( 1 ) for cutting a strand of material ( 9 ), in particular a thread-like element, preferably a thread, a cord or a rope, with at least one retaining element ( 2 ), in which a clamping channel ( 8th ) for receiving the material strand ( 9 ) is formed, with at least one cutting edge ( 6 . 6 ' ), which in the holding element ( 2 ) is movably arranged and in the clamping channel ( 8th ) for cutting the material strand ( 9 ) is insertable, characterized in that the clamping channel ( 8th ) a recess ( 10 ) and the material strand ( 9 ) within the recess ( 10 ) of the clamping channel ( 8th ), ie without contact with the clamping channel ( 8th ) is feasible and by the at least one cutting edge ( 6 . 6 ' ) in this recess ( 10 ) is einschneidbar. Cutting device according to claim 1, characterized in that the holding element ( 2 ) two complementarily formed and between an open and a closed position mutually movable cutting block units ( 3 . 3 ' ), wherein in each of the cutting block units ( 3 . 3 ' ) a groove ( 7 . 7 ' ) is formed and these grooves ( 7 . 7 ' ) in the closed position of the cutting block units ( 3 . 3 ' ) together the clamping channel ( 8th ) form. Cutting device according to claim 2, characterized in that in each of the cutting block units ( 3 . 3 ' ) a guided tour ( 11 . 11 ' ) for a cutting edge ( 6 . 6 ' ) is trained. Cutting device according to claim 3, characterized in that the guides ( 11 . 11 ' ) the recess ( 10 ) of the clamping channel ( 8th ) form. Cutting device according to one of claims 2 to 4, characterized in that the cutting block units ( 3 . 3 ' ) in the longitudinal direction ( 1 ) of the clamping channel ( 8th ) are displaceable. Cutting device according to one of claims 2 to 5, characterized in that at least one of the cutting block units ( 3 . 3 ' ) has a cooling and / or heat management means. Cutting device according to one of claims 3 to 6, characterized in that the cutting guides ( 11 . 11 ' ) have a coating or Gleitfluidzuführung. Cutting device according to one of the preceding claims, characterized in that the clamping channel ( 8th ) has a coating or a Gleitfluidzuführung. Cutting device according to claim 7 or 8, characterized in that the sliding fluid is air. Cutting device according to one of claims 2 to 9, characterized in that in at least one of the cutting block units ( 3 . 3 ' ) a ram for detachment of the material strand ( 9 ) from the clamping channel ( 8th ) is arranged movable. Cutting device according to one of the preceding claims, characterized in that a wall of the clamping channel ( 8th ) has a surface structure which improves the clamping effect at least in one region. Cutting device according to one of the preceding claims, characterized in that the extension of the recess ( 10 ) in the longitudinal direction (L) of the clamping channel ( 8th ) is between 0.05 and 2 mm. Cutting device according to one of the preceding claims, characterized in that the at least one cutting edge ( 6 . 6 ' ) is movable transversely to its cutting direction.

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