Tool bit of needle selector and needle selector

Abstract

The utility model relates to the technical field of needle selectors, in particular to a tool bit of a needle selector, which comprises a tool bit seat and a tool bit body, a pair of convex cambered surfaces and a top plane which are symmetrically arranged are formed at the end part of the tool bit body far away from the tool bit seat, the top plane is connected with the inner ends of the two convex cambered surfaces, and the convex cambered surfaces can be arc surfaces, parabolic surfaces and vortex line surfaces. The needle selector comprises a plurality of needle selector tool bits which are arranged in parallel. According to the needle selector, the inclined surface of the original tool bit is replaced by the convex cambered surface, and centrifugal force can be generated when the stitch moves on the convex cambered surface, so that the friction force between the stitch and the tool bit body is reduced, the abrasion of the tool bit can be reduced, the service life of the needle selector can be prolonged, and the market competitiveness of the needle selector can also be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of needle selectors, in particular to a needle selector cutter head and a needle selector. Background Art

[0002] A needle selector is an accessory that selects the jacquard needles in the needle cylinder to achieve the purpose of weaving patterns. Authorization announcement number CN 205775128U discloses a needle selector blade for a computer flat knitting machine, comprising a blade body, a through hole in the middle of the blade body, and slopes on both sides of the blade body. The lower end of the blade body is provided with a fixed end connected to the blade body as a whole, and both sides of the fixed end are bent in the same direction to form a pin seat, and a pin hole is provided on the pin seat. A magnet is also fixedly connected below the fixed end, and the outer side of the magnet is also covered with a magnetic sleeve. When the needle selector selects a needle, the inclined surface of the blade body presses against the pin corresponding to the needle, driving the pin to move. There is friction between the pin and the inclined surface of the blade body, and the friction is relatively large. Over time, the inclined surface of the blade body will produce greater wear, affecting needle selection. At the same time, a computer flat knitting machine needs to be equipped with multiple needle selectors, and the replacement cost of the needle selector is relatively high. Utility Model Content

[0003] The purpose of the utility model is to provide a needle selector cutter head and a needle selector, by replacing the original inclined surface of the cutter head with an outward convex arc surface. When the needle moves on the outward convex arc surface, centrifugal force can be generated, thereby reducing the friction between the needle and the cutter head body, thereby reducing the wear of the cutter head, increasing the service life of the needle selector, and also improving the market competitiveness of the needle selector.

[0004] The above technical objectives of the present invention are achieved through the following technical solutions:

[0005] A needle selector cutter head comprises a cutter head seat and a cutter head body. The end of the cutter head body away from the cutter head seat is formed with a pair of symmetrically arranged convex arc surfaces and a top plane, and the top plane connects the inner ends of the two convex arc surfaces.

[0006] By driving the needle foot to move through the convex arc surface, the needle foot can be subjected to a centrifugal force, thereby reducing the positive pressure of the needle foot on the cutter head body, thereby reducing the friction and reducing the wear of the cutter head body.

[0007] Preferably, the outer convex arc surface and the top plane are transitioned by a rounded corner.

[0008] Preferably, the outer convex arc surface is an arc surface, which is a section of a full circle, and its central angle does not exceed 45°. The center of the arc surface and the arc are respectively located on both sides of the perpendicular bisector of the top plane.

[0009] Preferably, the convex arc surface can also be a parabolic surface, the outline of the parabolic surface is a segment of a parabola, and the movement of the needle foot on the parabola will also generate centrifugal force, thereby reducing the positive pressure of the needle on the convex arc surface, reducing friction, and thus reducing wear on the convex arc surface.

[0010] Preferably, the convex arc surface can also be a vortex line surface, the contour of the vortex line surface is a section of vortex line, and the needle foot moving on the parabola will also generate centrifugal force, thereby reducing the positive pressure of the needle on the convex arc surface, reducing friction, and thus reducing the wear on the convex arc surface.

[0011] A needle selector comprises a plurality of needle selector cutter heads arranged in parallel.

[0012] Preferably, the number of the needle selector blades of the needle selector is 3 to 16, and the tapers of the convex arc surfaces of the multiple needle selector blades gradually become slower to adapt to the needles at different positions and different protruding heights of the machine needle.

[0013] Preferably, 2 to 4 needle selector blades form a group, and the specifications of the convex arc surfaces of the multiple needle selector blades in the same group are consistent;

[0014] The tapers of the outer convex arc surfaces of the multiple sets of needle selector blades gradually become gentler.

[0015] Preferably, the number of needle selector heads in a group is 2, which can meet the needle selection requirements without causing too much wear difference and can also reduce the mold opening cost of the corresponding head.

[0016] The outstanding effects of the utility model are:

[0017] Compared with the existing technology, the outer convex arc surface replaces the original bevel of the cutter head. When the needle moves on the outer convex arc surface, centrifugal force can be generated, thereby reducing the friction between the needle and the cutter head body, thereby effectively reducing the wear of the cutter head, increasing the service life of the needle selector, and also improving the market competitiveness of the needle selector;

[0018] The cutter heads are grouped on the same needle selector, which can reduce the mold opening cost of the cutter heads and reduce the production cost of the needle selector while meeting the usage requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural diagram of the needle selector cutter head of the utility model;

[0020] Figure 2 This is a structural diagram of a needle selector cutter head embodiment 1 of the present invention;

[0021] Figure 3 This is a structural diagram of a needle selector cutter head embodiment 2 of the present utility model;

[0022] Figure 4 This is a structural diagram of a needle selector cutter head embodiment 3 of the present utility model;

[0023] Figure 5 Schematic diagram for comparison of the cutter head with an inclined surface, an arc surface, a parabola surface and a vortex line surface;

[0024] Figure 6 This is a schematic diagram of the needle selector and the needle status when selecting the needle;

[0025] Figure 7 This is the force analysis diagram when the pin moves on the inclined plane;

[0026] Figure 8 This is a force analysis diagram of the pin when it moves on the convex arc surface;

[0027] Figure 9 A schematic structural diagram of a needle selector embodiment 1 of the present invention;

[0028] Figure 10 for Figure 8 Front view of

[0029] Figure 11 for Figure 9 A partial enlarged view of B;

[0030] Figure 12 This is a structural diagram of a needle selector embodiment 2 of the utility model;

[0031] Figure 13 for Figure 11 Partial front view.

[0032] Reference numerals: 10, cutter head seat;

[0033] 20. Cutting head body; 201. Outer convex arc surface; 202. Top plane; 203. Rounded corners;

[0034] 90. Needle; 91. Stitch. DETAILED DESCRIPTION

[0035] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0036] The following references Figures 1 to 13 The following describes the embodiments of the present invention:

[0037] Needle selector blade embodiment 1

[0038] A needle selector head, such as Figure 1As shown, it includes a cutter head seat 10 and a cutter head body 20, and the end of the cutter head body 20 away from the cutter head seat 10 is formed with a pair of symmetrically arranged convex arc surfaces 201 and a top plane 202, and the top plane 202 connects the inner ends of the two convex arc surfaces 201, and the convex arc surface 201 and the top plane 202 are transitioned by a rounded corner 203.

[0039] like Figure 2 As shown, the outer convex arc surface 201 of this embodiment is a circular arc surface.

[0040] The part where the needle selector head of the prior art drives the pin 91 of the needle 90 to move is generally an inclined surface. Now, the force analysis is performed on the pin when it moves on the inclined surface. Figure 7 As shown in the figure, the box in the figure represents the needle foot, and the oblique line in the figure represents the inclined plane. The needle foot of the needle 90 itself is subjected to a force F exerted by the textile machine, and the inclined plane provides a supporting force F to it. N1 , according to the action and reaction forces, the support force F N1 Equal to the positive pressure of the needle pin on the inclined plane, first decompose the force F into F1 and F2, F1 and F2 are set vertically, F1 is set vertically to the inclined plane, and the angle between F and F1 is θ, thus obtaining

[0041] F1=F*cosθ= F N1；

[0042] Friction force F between the pin and the inclined surface 摩1 =μ*F N1 =μ* F*cosθ.

[0043] The force analysis of the needle pin on the arc surface of this embodiment shows that the needle pin itself is subjected to a force F from the textile machine, and the inclined surface provides a supporting force F to it. N2， like Figure 8 As shown:

[0044] Similarly, first decompose the force F into F3 and F 4， F3 and F4 are set vertically and F3 faces the center of the arc surface. Assuming that the angle between F and F1 is also θ, we can get

[0045] F3=F*cosθ;

[0046] Since the needle pin has a high speed when moving on the arc surface, the needle pin will generate a centrifugal force F 离 ,

[0047] F 离 =m*v 2 / r;

[0048] According to the action force and reaction force, we can get

[0049] F N2+ F 离 = F3, that is, F N2 = F3-F 离 = F*cosθ- m*v 2 / r ；

[0050] Friction force F between pin and arc surface 摩2 =μ*F N2 =μ*F*cosθ- m*v 2 / r, due to F 离 =m*v 2 / r is a force greater than 0, and the greater the speed, the greater the centrifugal force, so we can get

[0051] F 摩2 <F 摩1 That is, the friction force of the needle on the arc surface when it moves on the arc surface is smaller than the friction force when the needle moves on the inclined surface. The smaller the friction, the smaller the wear on the cutter head.

[0052] Needle selector blade embodiment 2

[0053] like Figure 1 、 Figure 3 As shown, a needle selector cutter head includes a cutter head seat 10 and a cutter head body 20. The end of the cutter head body 20 away from the cutter head seat 10 is formed with a pair of symmetrically arranged convex arc surfaces 201 and a top plane 202, and the top plane 202 connects the inner ends of the two convex arc surfaces 201.

[0054] In this embodiment, the convex arc surface 201 is a parabola.

[0055] Since the parabola is also an outwardly convex surface, the needle foot also has centrifugal force when moving on the parabola, which can also reduce the friction on the parabola, thereby reducing the wear on the cutter head.

[0056] Needle selector blade embodiment 3

[0057] like Figure 1 and Figure 4 As shown, a needle selector cutter head includes a cutter head seat 10 and a cutter head body 20. The end of the cutter head body 20 away from the cutter head seat 10 is formed with a pair of symmetrically arranged convex arc surfaces 201 and a top plane 202, and the top plane 202 connects the inner ends of the two convex arc surfaces 201.

[0058] The outer convex arc surface 201 of this embodiment is a spiral line surface.

[0059] Similarly, since the vortex line surface is also an outward convex curved surface, the needle foot also has centrifugal force when moving on the vortex line surface, which can also reduce the friction on the vortex line surface, thereby reducing the wear on the cutter head.

[0060] Needle selector embodiment 1

[0061] A needle selector, such as Figure 9 、 Figure 10 、 Figure 11 As shown, it includes multiple needle selector cutter heads arranged in parallel.

[0062] The number of the needle selector blades of the needle selector of this embodiment is 3 to 16, and the tapers of the convex arc surfaces 201 of the multiple needle selector blades gradually become slower to adapt to the needle pins with different protruding heights at different positions of the machine needle.

[0063] Needle selector embodiment 2

[0064] A needle selector, such as Figure 12 、 Figure 13 As shown, it includes multiple needle selector cutter heads arranged in parallel.

[0065] The needle selector blades of the needle selector of this embodiment are grouped into 2 to 4 pieces, and the specifications of the convex arc surfaces 201 of the needle selector blades of the same group are consistent;

[0066] The tapers of the convex arc surfaces 201 of the multiple sets of needle selector blades gradually become gentler.

[0067] The best number of needle selector heads in a group is 2, which can meet the needle selection needs, will not cause too much wear difference, and can also reduce the mold opening cost of the corresponding head.

[0068] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications based on the above assumptions should also be regarded as within the scope of protection of the present invention.

Claims

1. A needle selector cutter head, comprising a cutter head seat (10) and a cutter head body (20), characterized in that: The end of the cutter head body (20) away from the cutter head seat (10) is formed with a pair of symmetrically arranged outer convex arc surfaces (201) and a top plane (202), and the top plane (202) connects the inner ends of the two outer convex arc surfaces (201).

2. The needle selector cutter head according to claim 1, characterized in that: The outer convex arc surface (201) and the top plane (202) are transitioned via a rounded corner (203).

3. The needle selector cutter head according to claim 1, characterized in that: The outer convex arc surface (201) is a circular arc surface.

4. The needle selector cutter head according to claim 1, characterized in that: The outer convex arc surface (201) is a parabolic surface.

5. The needle selector cutter head according to claim 1, characterized in that: The outer convex arc surface (201) is a vortex line surface.

6. A needle selector, characterized in that: The invention comprises a plurality of needle selector cutter heads according to any one of claims 1 to 5 arranged in parallel.

7. The needle selector according to claim 6, characterized in that: The number of the needle selector cutter heads is 3 to 16, and the tapers of the convex arc surfaces (201) of the plurality of needle selector cutter heads gradually become slower.

8. The needle selector according to claim 6, characterized in that: The needle selector blades are grouped into 2 to 4 pieces, and the specifications of the convex arc surfaces (201) of the needle selector blades in the same group are consistent; The tapers of the convex arc surfaces (201) of the multiple sets of needle selector blades gradually become slower.

9. The needle selector according to claim 8, characterized in that: The number of needle selector heads in a set is 2.

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