TWM659940U - Improved single-sided intermodulation two-color jacquard circular knitting structure - Google Patents

Abstract

An improved single-sided intermodulation double-color jacquard circular knitting structure includes a knitting needle and a Schenk sheet, and the knitting needle and the Schenk sheet can perform periodic cross knitting operations. The Schenk sheet has a belly, one end of the belly forms a front end, the upper part of the belly forms a nose, the nose and the belly are inwardly concave to form a nose groove, one end of the nose has a bevel, the bevel extends from the bottom side of the nose to the top side, the bevel gradually increases in height in the forward direction, and a first angle is formed between the bevel and the top side of the nose, the angle of the first angle is 51-60 degrees, and has a better yarn guiding effect. A first pushing gauze surface and a second pushing gauze surface are arranged on the belly of the Schenk film. The first pushing gauze surface and the second pushing gauze surface are arranged opposite to each other. There is a second angle and a third angle between the first pushing gauze surface and the second pushing gauze surface and the top side of the belly of the film respectively. The second angle and the third angle are 141-160 degrees, and can have better pushing and guiding effects. The first pushing gauze surface and the second pushing gauze surface can be used to push the yarns to adjust each other to achieve a color change effect.

Description

Improved single-sided intermodulation two-color jacquard circular knitting structure

This creation involves a two-color jacquard circular knitting structure, especially an improved single-sided intermodulation two-color jacquard circular knitting structure for single-sided fabric.

There are single-sided intermodulation two-color jacquard structures in single-sided fabrics, which are mostly made using flat knitting machines. However, they can only use thick needles, so the knitting effect is poor, the knitted pattern is easily blurred, the product quality is relatively unstable, and the production speed is slow, the error rate is high, and the output is low. The applicant has proposed a TW I769592 "single-sided intermodulation two-color jacquard circular knitting structure, its knitting method and knitted fabric", which mainly sets a first push yarn surface and a second push yarn surface on the Schenck sheet, and can use the first push yarn surface and the second push yarn surface to push the yarn intermodulation to achieve a color change effect, and can be applied to thick needles without limitation, and can increase the output and stabilize the effect. In order to make the Schenk film have a better yarn guiding effect, there is still room for further improvement.

The technical problem that this invention aims to solve is to provide an improved single-sided intermodulation two-color jacquard circular knitting structure to address the shortcomings of existing technologies. It is not limited to using only thick needles, has better knitting effects, more stable product quality, higher production speed, lower error rate, higher output, and can have better yarn pushing and yarn guiding effects, thereby improving product yield and quality.

In order to solve the above technical problems, the invention provides an improved single-sided intermodulation double-color jacquard circular knitting structure, comprising: a Schenk sheet, the Schenk sheet can move along a forward direction and a backward direction, the forward direction and the backward direction are two opposite directions, the Schenk sheet has a belly, one end of the belly forms a front end, the upper part of the belly forms a nose, the nose and the belly are inwardly concave to form a nose groove, the top side of the belly of the Schenk sheet has a first The first push-gauze surface and the second push-gauze surface are located between the front end of the sheet belly and the sheet nose groove, the horizontal heights of the first push-gauze surface and the second push-gauze surface are both lower than the horizontal height of the sheet nose groove, and the first push-gauze surface is located between the second push-gauze surface and the sheet nose groove, the first push-gauze surface and the second push-gauze surface are arranged to form a spacing, one end of the sheet nose has a bevel, and a first angle is formed between the bevel and the top side of the sheet nose, and the first angle is 5 1~60 degrees, a second angle is formed between the first push-gauze surface and the top side of the sheet belly, the second angle is 141~160 degrees, a third angle is formed between the second push-gauze surface and the top side of the sheet belly, the third angle is 141~160 degrees; and a knitting needle, the knitting needle can rise and fall, the upper end of the knitting needle has a needle hook, the knitting needle and the Schenk sheet can perform periodic cross knitting operations; wherein the first push-gauze surface and the second push-gauze surface are arranged opposite to each other, the first push-gauze surface The second push-gauze surface is closer to the front end of the sheet belly than the first push-gauze surface. The first push-gauze surface gradually increases in height in the direction away from the front end of the sheet belly, and the second push-gauze surface gradually increases in height in the direction close to the front end of the sheet belly. When the Schenk sheet moves along the forward direction, the first push-gauze surface can push the yarn to move. When the Schenk sheet moves along the backward direction, the second push-gauze surface can push the yarn to move, so as to change the inside and outside positions of the yarn to achieve the effect of color change.

The beneficial effect of the invention is that the top side of the belly of the Schenk sheet of the invention has a first pushing gauze surface and a second pushing gauze surface, the first pushing gauze surface and the second pushing gauze surface are arranged opposite to each other, the second pushing gauze surface is closer to the front end of the belly than the first pushing gauze surface, the first pushing gauze surface gradually increases in height in the direction away from the front end of the belly, and the second pushing gauze surface gradually increases in height in the direction close to the front end of the belly. When the Schenk sheet moves in the forward direction, the first pushing gauze surface can push the yarn (the second yarn) to move, and when the Schenk sheet moves in the backward direction, the second pushing gauze surface can push the yarn (the second yarn) to move, so as to change the inside and outside positions of the yarn to achieve the effect of color change. This creation uses a circular knitting machine, which is not limited to using only thick needles. The knitting effect is better, the product quality is more stable, and the structure is simple, easy to operate, the production speed is higher, the error rate is lower, and the output is higher.

Furthermore, one end of the nose has a bevel, and a first angle is formed between the bevel and the top side of the nose. The first angle is 51-60 degrees, which can make the bevel form a better angle and have a better yarn guiding effect. A second angle is formed between the first push yarn surface and the top side of the belly, and the second angle is 141-160 degrees. A third angle is formed between the second push yarn surface and the top side of the belly, and the third angle is 141-160 degrees, which can make the first push yarn surface and the second push yarn surface form a better angle, and have a better push yarn and yarn guiding effect.

To further understand the features and technical content of this work, please refer to the following detailed description and diagrams of this work. However, the diagrams provided are only for reference and description and are not used to limit this work.

The following is a specific and concrete example to illustrate the implementation methods disclosed by this creation. The technical personnel in this field can understand the advantages and effects of this creation from the content disclosed in this manual. This creation can be implemented or applied through other different specific embodiments, and the details in this manual can also be modified and changed in various ways based on different viewpoints and applications without deviating from the concept of this creation. In addition, the attached figures of this creation are only for simple schematic illustrations and are not depicted according to actual sizes. Please note in advance. The following implementation methods will further explain the relevant technical content of this creation in detail, but the disclosed content is not used to limit the scope of protection of this creation. In addition, the term "or" used in this article may include any one or more combinations of the related listed items depending on the actual situation.

[Implementation example]

Please refer to Figures 1 to 4. This invention provides an improved single-sided intermodulation double-color jacquard circular knitting structure, including a Schenk sheet 1 and a knitting needle 2. The Schenk sheet 1 can be placed above a needle cylinder (not shown), and a knitting needle 2 capable of rising and falling is provided on the knitting needle groove on the outer peripheral surface of the needle cylinder. The knitting needle 2 is provided on one side of the Schenk sheet 1. The upper end of the knitting needle 2 has a needle hook 21. The knitting needle 2 and the Schenk sheet 1 can perform periodic cross knitting operations. The Schenk sheet 1 has a belly 11, the top side of which can be horizontal, and the belly 11 is located at one end (front end) of the Schenk sheet 1, and one end of the belly 11 forms a front end 111. A nose 12 can be formed above the sheet belly 11, and a nose groove 13 is formed between the sheet nose 12 and the sheet belly 11. A guide protrusion 14 can be provided on the top side of the Schenk sheet 1 near the other end (rear end).

The top and bottom of the nose 12 may be horizontal. One end of the nose 12 has a bevel 121 extending from the bottom to the top of the nose 12 , and the bevel 121 gradually increases in height toward the forward direction A. A first angle θ1 is formed between the bevel 121 and the top side of the nose 12. The first angle θ1 is 51-60 degrees. The first angle θ1 can be 51, 52, 53, 54, 55, 56, 57, 58, 59 or 60 degrees. The first angle θ1 is preferably 55-57 degrees, and the best is 55.89 degrees. The first angle θ1 is at least 51 degrees, which can make the bevel 121 form a better angle and have a better yarn guiding effect.

In this embodiment, the nose 12 has a first height H1, which is the height of the Schenck sheet 1 in the vertical direction, and the first height H1 is 0.5~1.5mm. The first height H1 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm or 1.5mm, etc. The first height H1 is preferably 1mm. The nose 12 has a better first height H1 and has a better yarn guiding effect.

In this embodiment, the nose groove 13 has a second height H2, which is the height of the Schenck plate 1 in the vertical direction, and the second height H2 is 0.4~1.2mm. The second height H2 can be 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm or 1.2mm, etc. The second height H2 is preferably 0.8mm. The nose groove 13 has a better second height H2 and has a better yarn guiding effect. The nose 12 has a suitable first height H1, and the nose groove 13 has a suitable second height H2, so a better yarn guiding effect can be obtained.

When the Schenk piece 1 is set on the Schenk piece groove (omitted in the figure) of the needle cylinder, the Schenk piece 1 can cooperate with the Schenk piece cam seat (cooperation), so the rotation of the needle cylinder itself can be used to make the Schenk piece 1 perform periodic forward and backward movements. The Schenk piece 1 can be pushed forward and backward by the guide protrusion 14. The opposite weaving needle 2 also cooperates with the weaving needle cam seat to make the weaving needle 2 perform periodic rising and falling movements by the rotation of the needle cylinder itself. The Schenk piece 1 can be pushed forward and backward by the guide protrusion 14. The Schenk piece 1 can move along the forward direction A and the backward direction B. The forward direction A and the backward direction B are two opposite directions. The guide protrusion 14 of the Schenk piece 1 is matched in a track 31 of a mountain corner 3 (as shown in FIG. 11 ). The track 31 can be used to push the guide protrusion 14 of the Schenk piece 1 so that the Schenk piece 1 can move forward and backward. The two sides of the track 31 can form a first push surface 311 and a second push surface 312 respectively. The first push surface 311 can be used to push the guide protrusion 14 of the Schenk piece 1 so that the Schenk piece 1 can move along the forward direction A so that the Schenk piece 1 can be pushed forward. The second push surface 312 can be used to push the guide protrusion 14 of the Schenk piece 1 so that the Schenk piece 1 can move along the backward direction B so that the Schenk piece 1 can be retracted (not pushed out).

The top side of the sheet belly 11 of the Schenk sheet 1 has a first push-gauze surface 15 and a second push-gauze surface 16. The first push-gauze surface 15 and the second push-gauze surface 16 are arranged opposite to each other. The second push-gauze surface 16 is closer to the front end 111 of the sheet belly 11 than the first push-gauze surface 15, that is, the second push-gauze surface 16 is located in front of the first push-gauze surface 15. Preferably, the first push-gauze surface 15 and the second push-gauze surface 16 are arranged to be spaced apart. The first push-gauze surface 15 gradually increases in height from front to back, that is, the first push-gauze surface 15 gradually increases in height in the direction away from the front end 111 of the sheet belly 11. The second push-gauze surface 16 gradually increases in height from the back to the front, that is, the second push-gauze surface 16 gradually increases in height toward the front end portion 111 close to the sheet belly 11. When the Schenk sheet 1 moves along the forward direction A, the first push-gauze surface 15 can be used to push the yarn (the second yarn) to move. When the Schenk sheet 1 moves along the backward direction B, the second push-gauze surface 16 can be used to push the yarn (the second yarn) to move. Therefore, the first push-gauze surface 15 and the second push-gauze surface 16 can be used to form a guide surface to guide the movement of the yarn.

In this embodiment, there is a spacing length L between the first pushing yarn surface 15 and the second pushing yarn surface 16, and the spacing length L is 0.5~1.5mm. The spacing length L can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm or 1.5mm, etc. The spacing length L is preferably 0.9m. The first pushing yarn surface 15 and the second pushing yarn surface 16 form a better spacing and have a better yarn guiding effect.

The first and second push-gauze surfaces 15 and 16 can be inclined surfaces or curved surfaces, etc. The shapes of the first and second push-gauze surfaces 15 and 16 are not limited, as long as they can be used to push (guide) the yarn to move. In this embodiment, the first and second push-gauze surfaces 15 and 16 are both inclined surfaces, and the first and second push-gauze surfaces 15 and 16 are arranged at intervals. The top side of the sheet belly 11 of the Schenck sheet 1 also has a spacing surface 17, and the spacing surface 17 can be a plane, which can have a better yarn guiding effect. The yarn guiding effect can be greatly improved by matching the appropriate spacing length L between the first and second push-gauze surfaces 15 and 16. The spacing surface 17 is disposed between the first pushing yarn surface 15 and the second pushing yarn surface 16, that is, the spacing surface 17 is disposed between the lowest point of the first pushing yarn surface 15 and the lowest point of the second pushing yarn surface 16. With this design, when the knitting needle 2 is hooked down, the first pushing yarn surface 15 and the second pushing yarn surface 16 can push the yarn to move, so as to change the inside and outside positions of the yarn to achieve the effect of color change.

A second angle θ2 is formed between the first pushing surface 15 and the top side of the sheet belly 11. The second angle θ2 is 141-160 degrees. The second angle θ2 can be 141 degrees, 145 degrees, 150 degrees, 155 degrees or 160 degrees, etc. The second angle θ2 is preferably 148-152 degrees, and the best is 149.24 degrees. The second angle θ2 is at least 141 degrees, so that the first pushing surface 15 can form a better angle and have a better pushing and guiding effect.

A third angle θ3 is formed between the second pushing yarn surface 16 and the top side of the sheet belly 11. The third angle θ3 is 141-160 degrees. The third angle θ3 can be 141 degrees, 145 degrees, 150 degrees, 155 degrees or 160 degrees, etc. The third angle θ3 is preferably 148-152 degrees, and the best is 149.24 degrees. The third angle θ3 is at least 141 degrees, so that the second pushing yarn surface 16 can form a better angle and have a better pushing yarn and guiding yarn effect. The first angle θ1, the second angle θ2 and the third angle θ3 can be matched with each other to form a better angle, and have a better pushing yarn and guiding yarn effect.

In this embodiment, the first push-gauze surface 15 and the second push-gauze surface 16 are located between the front end 111 of the sheet belly 11 and the sheet nose groove 13, and the horizontal heights of the first push-gauze surface 15 and the second push-gauze surface 16 are both lower than the horizontal height of the sheet nose groove 13, and the first push-gauze surface 15 is located between the second push-gauze surface 16 and the sheet nose groove 13, and the highest point of the first push-gauze surface 15 can be connected to the bottom of the sheet nose groove 13.

[Second embodiment]

Please refer to Figures 3 to 10. This embodiment also provides a knitting method of an improved single-sided intermodulation two-color jacquard circular knitting structure, including the following steps: First, an improved single-sided intermodulation two-color jacquard circular knitting structure is provided, including a Schenck sheet 1 and a knitting needle 2. The knitting needle 2 can rise and fall, and the Schenck sheet 1 can move forward and backward. The Schenck sheet 1 can move along the forward direction A and the backward direction B, so that the knitting needle 2 and the Schenck sheet 1 can perform periodic cross knitting operations; since the improved single-sided intermodulation two-color jacquard circular knitting structure is the same as the above-mentioned embodiment, it will not be described in detail.

When a first yarn 4 and a second yarn 5 are located below the hook 21 of the weaving needle 2 (as shown in FIGS. 3 and 4 ), and the second yarn 5 is located below the first yarn 4, the Schenk plate 1 can be pushed along the forward direction A so that the first pushing surface 15 pushes (guides) the second yarn 5 along the forward direction A so that the second yarn 5 is located on one side of the first yarn 4 (as shown in FIGS. 5 and 6 ), and the weaving needle 2 is lowered (hooked down). The hook 21 hooks the first yarn 4 and the second yarn 5 for weaving, and the first yarn 4 and the second yarn 5 are respectively located on the first side 101 and the second side 102 of the woven fabric 100 (as shown in FIG. 12 ). The first side 101 can be the front side or the back side of the woven fabric 100, and the second side 102 can be the back side or the front side of the woven fabric 100. The first yarn 4 and the second yarn 5 are yarns of different colors, so that the single-sided fabric can present a double-color jacquard effect.

When the first yarn 4 and the second yarn 5 are located below the hook 21 of the knitting needle 2 (as shown in FIGS. 7 and 8 ), and the second yarn 5 is located below the first yarn 4, the Schenck plate 1 can be pushed to move along the retreat direction B, so that the second yarn pushing surface 16 pushes (guides) the second yarn 5 to move along the retreat direction B, so that the second yarn 5 is located below the first yarn 4. On the other side (as shown in FIGS. 9 and 10 ), the knitting needle 2 is lowered (hooked down) to make the hook 21 hook the first yarn 4 and the second yarn 5 for weaving, so that the first yarn 4 and the second yarn 5 are respectively located on the second side 102 and the first side 101 of the woven fabric 100 (as shown in FIG. 12 ), so that the single-sided fabric can present a two-color jacquard effect with intermixed colors. In this way, the movement of the Schenck sheet 1 can be used to select the first pushing surface 15 or the second pushing surface 16 to push the second yarn 5, so that the second yarn 5 can be located on one side or the other side of the first yarn 4, so as to change the inside and outside positions of the first yarn 4 and the second yarn 5, thereby controlling the colors of the first surface 101 and the second surface 102 of the woven fabric 100, thereby forming a woven fabric 100 with a double-color jacquard effect.

[Beneficial effects of the embodiment]

The beneficial effect of the invention is that the top side of the belly of the Schenk sheet of the invention has a first push-gauze surface and a second push-gauze surface, the first push-gauze surface and the second push-gauze surface are arranged opposite to each other, the second push-gauze surface is closer to the front end of the belly than the first push-gauze surface, the first push-gauze surface gradually increases in height in the direction away from the front end of the belly, and the second push-gauze surface gradually increases in height in the direction close to the front end of the belly. When the Schenk sheet moves in the forward direction, the first push-gauze surface can push the yarn (the second yarn) to move, and when the Schenk sheet moves in the backward direction, the second push-gauze surface can push the yarn (the second yarn) to move, so as to change the inside and outside positions of the yarn to achieve the effect of color change. This creation uses a circular knitting machine, which is not limited to using only thick needles. It has better knitting effects, more stable product quality, simple structure, easy operation, higher production speed, lower error rate, and higher output.

Furthermore, one end of the nose has a bevel, and a first angle is formed between the bevel and the top side of the nose. The first angle is 51-60 degrees, which can make the bevel form a better angle and have a better yarn guiding effect. A second angle is formed between the first push-gauze surface and the top side of the belly, and the second angle is 141-160 degrees. A third angle is formed between the second push-gauze surface and the top side of the belly, and the third angle is 141-160 degrees, which can make the first push-gauze surface and the second push-gauze surface form a better angle, and have a better yarn removal and yarn guiding effect.

The above disclosed contents are only the preferred feasible embodiments of this creation, and do not limit the scope of patent application of this creation. Therefore, all equivalent technical changes made by using the description and diagram contents of this creation are included in the scope of patent application of this creation.

1: Schenck film

11: Sliced belly

111: Front end

12: Flat nose

121: Beveled edge

13: Nose slot

14: Guide protrusion

15: First push gauze surface

16: Second push gauze surface

17: Interval surface

θ1: first angle

θ2: Second angle

θ3: The third angle

H1: First height

H2: Second height

L: Spacing length

2: Knitting needles

21: Hook

3: Mountain Corner

31: Track

311: First push surface

312: Second push surface

4: First yarn

5: Second yarn

100:woven fabrics

101: First page

102: Second side

A: Forward direction

B: Backward direction

Figure 1 is a plan view of the Schenk piece of this creation.

Figure 2 is a detailed diagram of Part II of Figure 1.

Figure 3 is the action diagram of the improved single-sided intermodulation two-color jacquard circular knitting structure of this invention (I).

Figure 4 is a detailed diagram of Part IV of Figure 3.

Figure 5 is the action diagram of the improved single-sided intermodulation two-color jacquard circular knitting structure of this invention (Part 2).

Figure 6 is a detailed diagram of part VI of Figure 5.

Figure 7 is the action diagram of the improved single-sided intermodulation two-color jacquard circular knitting structure of this invention (III).

Figure 8 is a detailed diagram of part VIII of Figure 7.

Figure 9 is the action diagram of the improved single-sided intermodulation two-color jacquard circular knitting structure of this invention (IV).

Figure 10 is a detailed diagram of part X in Figure 9.

Figure 11 is a schematic diagram of the mountain corner of this creation.

Figure 12 is a schematic diagram of the woven fabric of this creation.

1: Schenck film

11: Sliced belly

111: Front end

12: Flat nose

121: Beveled edge

13: Nose slot

14: Guide protrusion

15: First push gauze surface

16: Second push gauze surface

17: Interval surface

θ1: first angle

θ2: Second angle

θ3: The third angle

H1: First height

H2: Second height

L: Spacing length

Claims (7)

An improved single-sided intermodulation double-color jacquard circular knitted structure includes: a Schenk sheet, the Schenk sheet can move along a forward direction and a backward direction, the forward direction and the backward direction are two opposite directions, the Schenk sheet has a belly, one end of the belly forms a front end, the upper part of the belly forms a nose, the nose and the belly are inwardly concave to form a nose groove, the top side of the belly of the Schenk sheet has a first push-gauze surface and a second push-gauze surface, the first push-gauze surface The second push-gauze surface is located between the front end of the sheet belly and the sheet nose groove, the horizontal heights of the first push-gauze surface and the second push-gauze surface are both lower than the horizontal height of the sheet nose groove, and the first push-gauze surface is located between the second push-gauze surface and the sheet nose groove, the first push-gauze surface and the second push-gauze surface are arranged to form a spacing, one end of the sheet nose has a bevel, and a first angle is formed between the bevel and the top side of the sheet nose, the first angle is 51-60 degrees, and the first push-gauze surface and the sheet belly are spaced apart. A second angle is formed between the top side of the sheet, the second angle is 141-160 degrees, a third angle is formed between the second push-gauze surface and the top side of the sheet belly, the third angle is 141-160 degrees; and a knitting needle, the knitting needle is arranged on one side of the Schenk sheet, the knitting needle can rise and fall, the upper end of the knitting needle has a needle hook, the knitting needle and the Schenk sheet can perform periodic cross knitting operations; wherein the first push-gauze surface and the second push-gauze surface are arranged opposite to each other, the second The pushing yarn surface is closer to the front end of the sheet belly than the first pushing yarn surface. The first pushing yarn surface gradually increases in height in the direction away from the front end of the sheet belly, and the second pushing yarn surface gradually increases in height in the direction close to the front end of the sheet belly. When the Schenk sheet moves along the forward direction, the first pushing yarn surface can push the yarn to move. When the Schenk sheet moves along the backward direction, the second pushing yarn surface can push the yarn to move, so as to change the inside and outside positions of the yarn to achieve the effect of color change. The improved single-sided intermodulation two-color jacquard circular knitted structure as described in claim 1, wherein the bevel extends from the bottom side of the nose to the top side, and the bevel gradually increases in height toward the forward direction. As described in claim 1, the improved single-sided intermodulation two-color jacquard circular knitted structure, wherein the nose of the sheet has a first height, the first height is the height of the Schenck sheet in the vertical direction, and the first height is 0.5~1.5mm. As described in claim 1, the improved single-sided intermodulation two-color jacquard circular knitted structure, wherein the nose groove of the sheet has a second height, the second height is the height of the Schenck sheet in the vertical direction, and the second height is 0.4~1.2mm. As described in claim 1, the improved single-sided intermodulation two-color jacquard circular knitted structure, wherein there is a spacing length between the first push-gauze surface and the second push-gauze surface, and the spacing length is 0.5-1.5 mm, and the top side of the belly of the Schenck sheet has a spacing surface, and the spacing surface is a plane, and the spacing surface is arranged between the first push-gauze surface and the second push-gauze surface. The improved single-sided intermodulation two-color jacquard circular knitted structure as described in claim 1, wherein the nose has a first height, the first height is the height of the Schenker sheet in the vertical direction, the first height is 1mm, the nose groove has a second height, the second height is the height of the Schenker sheet in the vertical direction, the second height is 0.8mm, and there is a spacing length between the first push-gauze surface and the second push-gauze surface, the spacing length is 0.9mm. The improved single-sided intermodulation two-color jacquard circular knitted structure as described in claim 1, wherein the first angle is 55-57 degrees, the second angle is 148-152 degrees, and the third angle is 148-152 degrees.

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