EP3320133A1 - A chopper assembly and a method for cutting filaments - Google Patents

A chopper assembly and a method for cutting filaments

Info

Publication number
EP3320133A1
EP3320133A1 EP16736790.3A EP16736790A EP3320133A1 EP 3320133 A1 EP3320133 A1 EP 3320133A1 EP 16736790 A EP16736790 A EP 16736790A EP 3320133 A1 EP3320133 A1 EP 3320133A1
Authority
EP
European Patent Office
Prior art keywords
rods
pinch
strand
axis
chopper assembly
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP16736790.3A
Other languages
German (de)
French (fr)
Inventor
Willem Frans Van Der Mast
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Van Der Mast Industrial Innovations BV
Original Assignee
Van Der Mast Industrial Innovations BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Van Der Mast Industrial Innovations BV filed Critical Van Der Mast Industrial Innovations BV
Publication of EP3320133A1 publication Critical patent/EP3320133A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G1/00—Severing continuous filaments or long fibres, e.g. stapling
    • D01G1/02—Severing continuous filaments or long fibres, e.g. stapling to form staple fibres not delivered in strand form
    • D01G1/04—Severing continuous filaments or long fibres, e.g. stapling to form staple fibres not delivered in strand form by cutting

Definitions

  • the invention is related to a chopper assembly for cutting filaments in a strand into short lengths, provided with a rotatable first member having a surface extending around the axis of rotation of the first member and being provided with cutting blades extending outwards with respect to said surface, and provided with a rotatable second member having a surface extending around the axis of rotation of the second member, wherein the first and second members are positioned in such way, that said two surfaces form a pinch where the two surfaces face each other and the smallest distance between the two surfaces is present, wherein the chopper assembly is provided with means for guiding the strand to said pinch in order to be cut by said cutting blades in said pinch, wherein a rotatable third member is present being provided with a number of rods, which rods can move between and together with said surface of the first member and the surface of said second member in said pinch, whereby the rods extend parallel with respect to said cutting blades.
  • the surfaces of the first and second members may be located at a
  • the surfaces of the first and second member may be substantially cylindrical or may have any other shape, provided that the two members can form a pinch between their surfaces.
  • the surfaces may consist of elastic material.
  • the strand can be a bundle of glass or carbon filaments or filaments of any other material that has to be cut into short lengths, for example to be put in plastic or other material in order to improve the properties of that material.
  • the expression cut is used for any action resulting in the separation of a strand into pieces, including bending the strand in order to break it.
  • the cutting blades for cutting the filaments may be metal blades or may consist of any other suitable material.
  • Publication US 4253363 discloses a chopper assembly as described above, whereby the rods are attached to a member that rotates around an axis of rotation located at a distance from the axis of rotation of the member provided with the cutting blades.
  • An object of the invention is a chopper assembly for cutting filaments in a strand into short lengths, whereby an improved and more reliable cutting action is applied.
  • Another object of the invention is a chopper assembly for cutting filaments in a strand into short lengths, whereby the cut filaments correctly are removed from the location where they are cut.
  • the rods contact said surface of said rotatable second member, so that the strand is clamped in the pinch between at least two rods and the surface of the second member, and the filaments in the strand can be cut by a cutting blade between said at least two rods.
  • the third rotatable member may have any shape and position, provided that the rods can move through the pinch, whereby they are substantially parallel with respect to the cutting blades in the pinch.
  • the axis of rotation of the third member is parallel with respect to the axis of rotation of the second member, whereby the rods rotate around the surface of the first member or the surface of the second member. Thereby, any movement between the rods and the surface of the second member can be precluded when the strand is clamped.
  • the surfaces of the first and second member may have any shape, provided that the two members form a pinch between their surfaces.
  • said surface of the first member and/or said surface of the second member have a substantially cylindrical shape.
  • the surface of the second member is preferably made of elastic material.
  • the surface of the first member may be made of elastic material.
  • At least one of said surfaces of the first and second members are provided with grooves for engagement with said rods when they pass the pinch.
  • both surfaces are provided with grooves, so that the three members can drive each other, whereby only one of the members has to be driven by a motor.
  • said rotatable second member is connected with a motor in order to drive that member, and therewith the other two members.
  • a stationary air supply pipe is present for blowing away said short lengths of filaments after they are cut, wherein the end of the air supply pipe is located against a wall of the rotatable third member, said wall being provided with a number of openings through which openings the air from the pipe can pass in order to direct an air blow towards the filaments after they are cut.
  • the end of the air supply pipe is directed to the location where the cut fibres are released from the clamping action of the rods of the rotating third member.
  • the end of the air supply pipe is positioned against a wall of the rotating third member, so that the end is closed, unless an opening in the wall passes. At that moment a blow of air is produced.
  • the location of the openings is such that the blow of air reaches the cut pieces of filaments just after the rods release them.
  • said rotatable second member is provided with plates extending in outward direction with respect to the surface of the second member and extending parallel with said cutting blades when they pass said pinch, which plates can cooperate with said cutting blades in order to cut the strand.
  • one plate can cooperate with one cutting blade, but in a preferred embodiment of the invention, in said pinch, the cutting blade is positioned between two plates of the second member, so that two plates of the second member cooperate with one cutting blade of the first member.
  • the plates of the second member may be metal plates or may consist of any suitable material.
  • the plates may be sharp or blunt, or may have any other shape in order to perform the cutting action in cooperation with the cutting blades of the first member.
  • the axis of rotation of the second member and the axis of rotation of the third member and the pinch, and also the axis of rotation of the first member, may all be located in the same plane. Thereby, the clamping action between the rods and the surface of the second member takes place equally at both sides of the pinch. However, the cutting action of the cutting blade will take place before that blade reaches the pinch, because from the moment that the cutting blade passes the pinch, the cutting blade moves away from the surface of the second member.
  • the center of the first member being located on the axis of rotation of the first member, is located at a distance from the plane through the axis of rotation of the second member and the axis of rotation of the third member, so that the cutting blade still moves towards the second member when cutting the strand in the pinch.
  • the center of the first member is located centrally on the axis of rotation of that member. Said distance depends on the dimensions of the parts of the chopper assembly, but preferably, said distance is at least 2 mm.
  • the invention is related to a method for cutting filaments in a strand into short lengths by means of a chopper assembly, provided with a rotating first member having a surface extending around the axis of rotation of the first member and being provided with cutting blades extending outwards with respect to said surface, and provided with a rotating second member having a surface extending around the axis of rotation of the second member, wherein the first and second members are positioned in such way, that said two surfaces form a pinch where the two surfaces face each other and the smallest distance between the two surfaces is present, whereby the strand is guided to the pinch in order to be cut by said cutting blades, and whereby a rotating third member is present being provided with a number of rods, which rods move between and together with said surface of the first member and said surface of the second member through said pinch, whereby the rods in said pinch extend parallel with respect to said cutting blades, and whereby the said rods are pressed against said surface of said rotating second member and the strand is clamped between at least
  • Figure 1 shows the three rotatable members of the chopper in side view
  • Figure 2 is a view from the direction indicated by arrow II.
  • the figures show a first member 1 rotating around axis 2.
  • the first member 1 has a substantially cylindrical surface 3 and is provided with cutting blades 4 extending parallel with respect to axis 2.
  • the surface 3 is also provided with grooves 5 (not shown in figure 2) extending parallel with respect to axis 2.
  • the first member 1 cooperates with a second member 7 rotating around axis 8 being parallel with axis 2 of the first member 1.
  • the second member 7 has a substantially cylindrical surface 9 provided with grooves 10 (not shown in figure 2) extending parallel with respect to axis 8.
  • the first member 1 and the second member 7 form a pinch 12, being the location where the surfaces 3,9 of the first and second rotating members 1,7 has the smallest mutual distance.
  • the surface 9 of the second member 7 is provided with plates 11 extending substantially parallel with respect to axis 8.
  • the mutual positions of the cutting blades 4 of the first member 1 and the plates 11 of the second member 7 are such that, near the pinch 12, one cutting blade 4 of the first member 1 cooperates with two plates 11 of the second member 7 in order to cut the filaments of a strand (not shown in the figures) into short lengths. Thereby, the cutting blade 4 of the first member 1 moves between two plates 11 of the second member 7.
  • a third member 13 is present, rotating around axis 14 being parallel with respect to the axis 8 of the second member 7.
  • the third member 13 is provided with a number of rods 15, extending parallel with respect to axis 14.
  • the chopper assembly is provided with a stationary pipe 20 for guiding the strand comprising filaments (not shown in the figures) towards the pinch 12 where the strand will be cut.
  • the input of the strand is indicated by arrow 21.
  • the strand Before the strand reaches the pinch 12, it will be clamped between a rod 15 of the third member 13 and a groove 10 of the surface 9 of second member 7. The clamping takes place before, during and after the rods 15 pass the pinch 12.
  • the chopper assembly is provided with a stationary air supply pipe 22 for blowing away the cut filaments after the cutting action has taken place.
  • the end of air supply pipe 22 is positioned against a rotating flat wall 23 being a portion of third member 13. That wall 23 is provided with a number of openings 24 passing the end of the stationary air supply pipe 22 when third member 13 rotates around axis 14. Every time that an opening 24 passes the end of the air supply pipe 22, a blow of air is directed towards the location where the cut filaments are present, whereby the cut filaments will leave the chopper assembly.
  • the rods 15 of third member 13 are rotating around the substantially cylindrical surface 9 of the second member 7.
  • the rods 15 of member 13 may rotate around the substantially cylindrical surface 3 of first member 1.
  • the axis 14 of rotation of third member 13 is positioned above the axis 2 of first member 1 (in the arrangement of the first and second members 1,7 shown in the figures).
  • the axis 2 of the first member 1 , and the axis 8 of the second member 7, and the axis 14 of the third member 13 are all located in one plane, as is indicated in figure 1 with striped line 25.
  • the cutting blades 4 reach their farthest position between the cooperating plates 11 of the second member 7 in the pinch 12 being located in said plane 25.
  • the real cutting action will take place before the cutting blade 4 reaches said farthest position in the pinch 12. Therefore, in another embodiment, the axis 2 of the rotating member 1 is displaced a little to the right (in figure 1), so that the axis 2 as well as the pinch 12 is located at the right side of line 25 in figure 1. In that case, the real cutting action will take place at the location of line 25 in figure 1 (before the pinch 12 is reached), whereby the strand is clamped between the rods 15 and the grooves 10 equally at both sides of that location

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)

Abstract

A chopper assembly for cutting filaments in a strand into short lengths having rotatable first and second members (1,7), each having a surface (3,9) extending around the axes (2,8) of rotation of the members (1,7). The first and second members (1,7) are positioned in such way that said two surfaces (3,9) form a pinch (12). The first member (1) is provided with cutting blades (4). A rotatable third member (13) is provided with a number of rods (15). The rods (15) can move between and together with said surfaces (3,9) through said pinch (12). The strand is clamped between the surface (9) of the second member (7) and at least two rods (15). The filaments in the strand are cut by a cutting blade (4) between said at least two rods (15).

Description

A CHOPPER ASSEMBLY AND A METHOD FOR CUTTING FILAMENTS
The invention is related to a chopper assembly for cutting filaments in a strand into short lengths, provided with a rotatable first member having a surface extending around the axis of rotation of the first member and being provided with cutting blades extending outwards with respect to said surface, and provided with a rotatable second member having a surface extending around the axis of rotation of the second member, wherein the first and second members are positioned in such way, that said two surfaces form a pinch where the two surfaces face each other and the smallest distance between the two surfaces is present, wherein the chopper assembly is provided with means for guiding the strand to said pinch in order to be cut by said cutting blades in said pinch, wherein a rotatable third member is present being provided with a number of rods, which rods can move between and together with said surface of the first member and the surface of said second member in said pinch, whereby the rods extend parallel with respect to said cutting blades. In said pinch, the surfaces of the first and second members may be located at a distance from each other, said distance being small, so that the cutting blades of the first member can cut the filaments in the strand, whereby the strand is supported by the surface of the second member.
The surfaces of the first and second member may be substantially cylindrical or may have any other shape, provided that the two members can form a pinch between their surfaces. The surfaces may consist of elastic material.
The strand can be a bundle of glass or carbon filaments or filaments of any other material that has to be cut into short lengths, for example to be put in plastic or other material in order to improve the properties of that material. In this specification and in the claims, the expression cut is used for any action resulting in the separation of a strand into pieces, including bending the strand in order to break it. The cutting blades for cutting the filaments may be metal blades or may consist of any other suitable material.
Publication US 4253363 discloses a chopper assembly as described above, whereby the rods are attached to a member that rotates around an axis of rotation located at a distance from the axis of rotation of the member provided with the cutting blades.
Therefore, in the pinch, the rods keep some distance from the surface of the second member, but away from the pinch, the rods move outwardly with respect to the rotating first member, so that the rods are functioning as an ejection mechanism for the cut fibres. The rods do not interfere with the cutting action (see column 4, lines 35-44). An object of the invention is a chopper assembly for cutting filaments in a strand into short lengths, whereby an improved and more reliable cutting action is applied.
Another object of the invention is a chopper assembly for cutting filaments in a strand into short lengths, whereby the cut filaments correctly are removed from the location where they are cut.
In order to comply with one or both these objects, the rods contact said surface of said rotatable second member, so that the strand is clamped in the pinch between at least two rods and the surface of the second member, and the filaments in the strand can be cut by a cutting blade between said at least two rods. The third rotatable member may have any shape and position, provided that the rods can move through the pinch, whereby they are substantially parallel with respect to the cutting blades in the pinch. In a preferred embodiment of the invention, the axis of rotation of the third member is parallel with respect to the axis of rotation of the second member, whereby the rods rotate around the surface of the first member or the surface of the second member. Thereby, any movement between the rods and the surface of the second member can be precluded when the strand is clamped.
The surfaces of the first and second member may have any shape, provided that the two members form a pinch between their surfaces. However, in a preferred embodiment of the invention, said surface of the first member and/or said surface of the second member have a substantially cylindrical shape. In order to improve the clamping of the strand between the rods and the surface of the second member, the surface of the second member is preferably made of elastic material. Also the surface of the first member may be made of elastic material.
In a preferred embodiment of the invention, at least one of said surfaces of the first and second members are provided with grooves for engagement with said rods when they pass the pinch. Preferably both surfaces are provided with grooves, so that the three members can drive each other, whereby only one of the members has to be driven by a motor. Preferably, said rotatable second member is connected with a motor in order to drive that member, and therewith the other two members.
In a preferred embodiment of the invention, a stationary air supply pipe is present for blowing away said short lengths of filaments after they are cut, wherein the end of the air supply pipe is located against a wall of the rotatable third member, said wall being provided with a number of openings through which openings the air from the pipe can pass in order to direct an air blow towards the filaments after they are cut. Thereby, the end of the air supply pipe is directed to the location where the cut fibres are released from the clamping action of the rods of the rotating third member. The end of the air supply pipe is positioned against a wall of the rotating third member, so that the end is closed, unless an opening in the wall passes. At that moment a blow of air is produced. The location of the openings is such that the blow of air reaches the cut pieces of filaments just after the rods release them.
In a preferred embodiment of the invention, said rotatable second member is provided with plates extending in outward direction with respect to the surface of the second member and extending parallel with said cutting blades when they pass said pinch, which plates can cooperate with said cutting blades in order to cut the strand. Thereby, one plate can cooperate with one cutting blade, but in a preferred embodiment of the invention, in said pinch, the cutting blade is positioned between two plates of the second member, so that two plates of the second member cooperate with one cutting blade of the first member. The plates of the second member may be metal plates or may consist of any suitable material. The plates may be sharp or blunt, or may have any other shape in order to perform the cutting action in cooperation with the cutting blades of the first member.
The axis of rotation of the second member and the axis of rotation of the third member and the pinch, and also the axis of rotation of the first member, may all be located in the same plane. Thereby, the clamping action between the rods and the surface of the second member takes place equally at both sides of the pinch. However, the cutting action of the cutting blade will take place before that blade reaches the pinch, because from the moment that the cutting blade passes the pinch, the cutting blade moves away from the surface of the second member.
In order to perform the clamping action of the rods equally at both sides of the location where the cutting action takes place, in a preferred embodiment of the invention, the center of the first member, being located on the axis of rotation of the first member, is located at a distance from the plane through the axis of rotation of the second member and the axis of rotation of the third member, so that the cutting blade still moves towards the second member when cutting the strand in the pinch. The center of the first member is located centrally on the axis of rotation of that member. Said distance depends on the dimensions of the parts of the chopper assembly, but preferably, said distance is at least 2 mm.
Furthermore, the invention is related to a method for cutting filaments in a strand into short lengths by means of a chopper assembly, provided with a rotating first member having a surface extending around the axis of rotation of the first member and being provided with cutting blades extending outwards with respect to said surface, and provided with a rotating second member having a surface extending around the axis of rotation of the second member, wherein the first and second members are positioned in such way, that said two surfaces form a pinch where the two surfaces face each other and the smallest distance between the two surfaces is present, whereby the strand is guided to the pinch in order to be cut by said cutting blades, and whereby a rotating third member is present being provided with a number of rods, which rods move between and together with said surface of the first member and said surface of the second member through said pinch, whereby the rods in said pinch extend parallel with respect to said cutting blades, and whereby the said rods are pressed against said surface of said rotating second member and the strand is clamped between at least two rods and the surface of the second member, and the filaments in the strand are cut by a cutting blade between said at least two rods.
The invention will now be further elucidated by means of a description of an embodiment of a chopper assembly for cutting filaments in a strand into short lengths, whereby reference is made to the drawing comprising diagrammatical figures, showing schematically the relevant components of the chopper, whereby:
Figure 1 shows the three rotatable members of the chopper in side view, and
Figure 2 is a view from the direction indicated by arrow II.
The figures show a first member 1 rotating around axis 2. The first member 1 has a substantially cylindrical surface 3 and is provided with cutting blades 4 extending parallel with respect to axis 2. The surface 3 is also provided with grooves 5 (not shown in figure 2) extending parallel with respect to axis 2. The first member 1 cooperates with a second member 7 rotating around axis 8 being parallel with axis 2 of the first member 1. The second member 7 has a substantially cylindrical surface 9 provided with grooves 10 (not shown in figure 2) extending parallel with respect to axis 8. The first member 1 and the second member 7 form a pinch 12, being the location where the surfaces 3,9 of the first and second rotating members 1,7 has the smallest mutual distance. The surface 9 of the second member 7 is provided with plates 11 extending substantially parallel with respect to axis 8. The mutual positions of the cutting blades 4 of the first member 1 and the plates 11 of the second member 7 are such that, near the pinch 12, one cutting blade 4 of the first member 1 cooperates with two plates 11 of the second member 7 in order to cut the filaments of a strand (not shown in the figures) into short lengths. Thereby, the cutting blade 4 of the first member 1 moves between two plates 11 of the second member 7. Furthermore, a third member 13 is present, rotating around axis 14 being parallel with respect to the axis 8 of the second member 7. The third member 13 is provided with a number of rods 15, extending parallel with respect to axis 14. In order to show the rotating second member 7 in figure 2, some of the rods 15 of third member 13 are not reproduced in figure 2, notably the rods in front of the second member 7. During rotation of the first, second and third members 1,7,13 the grooves 5,10 in the surfaces 3,9 of the first and second members 1,7 are engaging the rods 15 near the pinch 12. Therefore, the motor (not shown in the figures) driving shaft 16 of second member 7, drives also the third member 13 and the first member 1. The direction of rotation of the three members 1,7,13 is indicated in figure 1 by arrows 17,18,19.
The chopper assembly is provided with a stationary pipe 20 for guiding the strand comprising filaments (not shown in the figures) towards the pinch 12 where the strand will be cut. The input of the strand is indicated by arrow 21. Before the strand reaches the pinch 12, it will be clamped between a rod 15 of the third member 13 and a groove 10 of the surface 9 of second member 7. The clamping takes place before, during and after the rods 15 pass the pinch 12.
Furthermore, the chopper assembly is provided with a stationary air supply pipe 22 for blowing away the cut filaments after the cutting action has taken place. The end of air supply pipe 22 is positioned against a rotating flat wall 23 being a portion of third member 13. That wall 23 is provided with a number of openings 24 passing the end of the stationary air supply pipe 22 when third member 13 rotates around axis 14. Every time that an opening 24 passes the end of the air supply pipe 22, a blow of air is directed towards the location where the cut filaments are present, whereby the cut filaments will leave the chopper assembly.
In the embodiment shown in the figures, the rods 15 of third member 13 are rotating around the substantially cylindrical surface 9 of the second member 7. However, in another embodiment, the rods 15 of member 13 may rotate around the substantially cylindrical surface 3 of first member 1. In that case, the axis 14 of rotation of third member 13 is positioned above the axis 2 of first member 1 (in the arrangement of the first and second members 1,7 shown in the figures).
In the embodiment shown in the figures, the axis 2 of the first member 1 , and the axis 8 of the second member 7, and the axis 14 of the third member 13 are all located in one plane, as is indicated in figure 1 with striped line 25. Thereby, the cutting blades 4 reach their farthest position between the cooperating plates 11 of the second member 7 in the pinch 12 being located in said plane 25. However, the real cutting action will take place before the cutting blade 4 reaches said farthest position in the pinch 12. Therefore, in another embodiment, the axis 2 of the rotating member 1 is displaced a little to the right (in figure 1), so that the axis 2 as well as the pinch 12 is located at the right side of line 25 in figure 1. In that case, the real cutting action will take place at the location of line 25 in figure 1 (before the pinch 12 is reached), whereby the strand is clamped between the rods 15 and the grooves 10 equally at both sides of that location
As said before, the figures show only the relevant parts of the chopper assembly. For example, means for bearing the three rotating members 1,7,13 are not shown, but they are well known in the art.
While the invention has been illustrated in the figures and the foregoing
description, the figures and description are to be considered as illustrative and exemplary and not restrictive, the invention is not limited to the shown embodiment.

Claims

1. A chopper assembly for cutting filaments in a strand into short lengths, provided with a rotatable first member (1) having a surface (3) extending around the axis (2) of rotation of the first member (1) and being provided with cutting blades (4) extending outwards with respect to said surface (3), and provided with a rotatable second member (7) having a surface (9) extending around the axis (8) of rotation of the second member (7), wherein the first and second members (1,7) are positioned in such way, that said two surfaces (3,9) form a pinch (12) where the two surfaces (3,9) face each other and the smallest distance between the two surfaces (3,9) is present, wherein the chopper assembly is provided with means (20) for guiding the strand to the pinch (12) in order to be cut by said cutting blades (4), and wherein a rotatable third member (13) is present being provided with a number of rods (15), which rods (15) can move between and together with said surface (3) of the first member (1) and the surface (9) of said second member (7) in said pinch (12), whereby the rods (15) extend parallel with respect to said cutting blades (4), characterized in that the rods contact said surface (9) of said rotatable second member (7), so that the strand is clamped in the pinch between at least two rods (15) and the surface (9) of the second member (7), and the filaments in the strand can be cut by a cutting blade (4) between said at least two rods (15).
2. A chopper assembly as is claimed in claim 1, characterized in that the axis (14) of rotation of the third member (13) is parallel with respect to the axis (8) of rotation of the second member (7).
3. A chopper assembly as is claimed in claim 1 or 2, characterized in that said surface (3) of the first member (1) has a substantially cylindrical shape.
4. A chopper assembly as is claimed in anyone of claims 1-3, characterized in that said surface (9) of the second member (7) has a substantially cylindrical shape.
5. A chopper assembly as is claimed in anyone of the preceding claims, characterized in that at least one of said surfaces (3,9) of the first and second members (1,7) are provided with grooves (5,10) for engagement with said rods (15) when they pass the pinch (12).
6. A chopper assembly as is claimed in anyone of the preceding claims, characterized in that said rotatable second member (7) is connected with a motor in order to drive that member (7).
7. A chopper assembly as is claimed in anyone of the preceding claims, characterized in that a stationary air supply pipe (22) is present for blowing away said short lengths of filaments after they are cut, wherein the end of the air supply pipe (22) is located against a wall (23) of the rotatable third member (13), said wall (23) being provided with a number of openings (24) through which openings (24) the air from the pipe (22) can pass in order to direct an air blow towards the filaments after they are cut.
8. A chopper assembly as is claimed in anyone of the preceding claims, characterized in that said rotatable second member (7) is provided with plates (11) extending in outward direction with respect to the surface (9) of the second member (7) and extending parallel with said cutting blades (4) in said pinch (12), which plates (11) can cooperate with said cutting blades (4) in order to cut the filaments in the strand.
9. A chopper assembly as is claimed in claim 8, characterized in that, in said pinch (12), the cutting blade (4) is positioned between two plates (11) of the second member (7).
10. A chopper assembly as is claimed in anyone of the preceding claims, characterized in that the center of the first member (1), being located on the axis (2) of rotation of the first member (10, is located at a distance from the plane through the axis (8) of rotation of the second member (7) and axis of (14) rotation of the third member (13).
11. A chopper assembly as is claimed in claim 11 , characterized in that said distance is at least 2 mm.
12. A method for cutting filaments in a strand into short lengths by means of a chopper assembly, provided with a rotating first member (1) having a surface (3) extending around the axis (2) of rotation of the first member (1) and being provided with cutting blades (4) extending outwards with respect to said surface (3), and provided with a rotating second member (7) having a surface (9) extending around the axis (8) of rotation of the second member (7), wherein the first and second members (1,7) are positioned in such way, that said two surfaces (3,9) form a pinch (12) where the two surfaces (3,9) face each other and the smallest distance between the two surfaces (3,9) is present, whereby the strand is guided to the pinch (12) in order to be cut by said cutting blades (4), and whereby a rotating third member (13) is present being provided with a number of rods (15), which rods (15) move between and together with said surface (3) of the first member (1) and said surface (9) of the second member (7) through said pinch (12), whereby the rods (15) in said pinch (12) extend parallel with respect to said cutting blades (4), characterized in the said rods are pressed against said surface (9) of said rotating second member and the strand is clamped between at least two rods (15) and the surface (9) of the second member (7), and the filaments in the strand are cut by a cutting blade (4) between said at least two rods (15).
EP16736790.3A 2015-07-10 2016-06-10 A chopper assembly and a method for cutting filaments Withdrawn EP3320133A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1041396A NL1041396B1 (en) 2015-07-10 2015-07-10 A chopper assembly and a method for cutting filaments.
PCT/EP2016/000955 WO2017008871A1 (en) 2015-07-10 2016-06-10 A chopper assembly and a method for cutting filaments

Publications (1)

Publication Number Publication Date
EP3320133A1 true EP3320133A1 (en) 2018-05-16

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Application Number Title Priority Date Filing Date
EP16736790.3A Withdrawn EP3320133A1 (en) 2015-07-10 2016-06-10 A chopper assembly and a method for cutting filaments

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EP (1) EP3320133A1 (en)
NL (1) NL1041396B1 (en)
WO (1) WO2017008871A1 (en)

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CN112030278B (en) * 2020-07-24 2021-08-13 江苏恒力化纤股份有限公司 Intermittent grading carding and cutting equipment for carbon fiber filaments

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WO2017008871A1 (en) 2017-01-19

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