Thin pulley block of needle selection device and needle selection device provided with pulley block

Abstract

The invention discloses a thin pulley block of a needle selection device and the needle selection device provided with the pulley block. The thin pulley block mainly comprises a support, two pulleys, a first fixing plate, a second fixing plate and a third fixing plate. The two pulleys are connected through the support, and the two pulleys are installed on the support in a freely rotating mode through the corresponding bearing assemblies. The first fixing plate, the second fixing plate and the third fixing plate are all fixed to the support, one pulley is located between the first fixing plate and the second fixing plate, and the other pulley is located between the second fixing plate and the third fixing plate. According to the design of the frame shaped like the Chinese character'wang ', under the condition that the vertical plate of the pulley block is thinned, the structural stability of the support can be enhanced, and the stress of the shaft part for bearing the pulley is changed from the stress of the end part of a cantilever beam fixed at a single end to the stress of the middle part fixed at two ends, so that the problem of'supporting' under the stress of the pulley shaft is solved; the manufacturing problem of the ultra-thin pulley block is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of electronic jacquard machines of textile machinery, and in particular relates to a thin pulley block of a needle selection device and a needle selection device equipped with the pulley block. Background Art

[0002] In recent years, electronic jacquard machines have made great progress. Electronic jacquard machines use a key component called a needle selection device (also called a solenoid valve, electromagnet, assembly, etc.). The needle selection device is the executive component of the electronic jacquard machine, and its function is to convert electrical signals into the rise and fall of the warp yarn. Jacquard machines are divided into single-action and double-action types. The double-action type has a complex mechanism. One jacquard needle (first thread) corresponds to two vertical hooks, and the two vertical hooks are converted into the rise and fall of a jacquard needle (first thread) through a pulley set. The double-action type causes less damage to the warp yarn and is beneficial to weaving. Currently, most electronic jacquard machines are double-action type.

[0003] The double-action needle selection device often uses a pulley block, which converts the up and down movement of the two vertical hooks into the up and down movement of a jacquard needle (first line) through the pulley block. The pulley block moves back and forth at high speed with the lifting knife in the jacquard mechanism, with both up and down displacement movement and rotation movement of the pulley. The pulley block is also a force-bearing part. The driving force of the lifting knife is applied to the pulley block through the vertical hook, and the spring tension of the wire assembly is also applied to the pulley block through the first line. The static force design value of the pulley used in ordinary textile weaving is 1kg. The force of the pulley used in carpet weaving will be increased. The force of the pulley used in special weaving such as industrial weaving and three-dimensional weaving may be further increased.

[0004] The jacquard machine with a large needle count requires the density of the needle selection device to be increased, which will inevitably require the size of the jacquard mechanism to be reduced, and thus the pulley block will also be required to be reduced in size. For example, the pulley block of the needle selection device of a certain mainstream jacquard machine has a width (depending on the pulley diameter) of 20mm and a thickness of 5mm. It is not difficult to change the width, such as reducing it from 20mm to 14mm, and reducing the pulley diameter can be achieved, but reducing the thickness and making a thin pulley will be more challenging.

[0005] The current pulley bracket is a "cross" structure, with the vertical plates on both sides and the middle connecting plate forming a "cross" shape (such as Figure 1 As shown). The shaft ends of the fixed pulley are located at both ends of the vertical plate. If the vertical plate is thick enough, this end-loaded structure will not cause much problem. If the vertical plate is thinned to a thin structure, the stability of this single-end fixed cantilever beam structure will become very poor. For example, if the design target is a pulley block with a thickness of 2 to 2.4 mm, the thickness allocated to the vertical plate is about 0.5 to 0.8 mm. Even if a very strong metal material is used, the bracket of this structure is not stable enough.

[0006] Therefore, the current problems are that, on the one hand, the force on the pulley may increase, and on the other hand, a thin design is required to adapt to high density to reduce the volume, which is a prominent contradiction. In fact, the main function of the existing pulley bracket is to "connect" two pulleys to form a pulley block, without considering the "support" function required under the condition of the force on the pulley shaft. Summary of the Invention

[0007] In order to make up for the deficiencies of the above-mentioned existing technologies, the present invention provides a thin pulley block for a needle selection device and a needle selection device equipped with this pulley block.

[0008] To solve the above technical problems and achieve the above technical effects, the present invention is realized through the following technical solutions:

[0009] A thin pulley block for a needle selection device, comprising a bracket, two pulleys, a first fixing plate, a second fixing plate and a third fixing plate; the two pulleys are connected by the bracket, and the two pulleys are rotatably installed on the bracket through corresponding bearing assemblies; at the same time, the first fixing plate, the second fixing plate and the third fixing plate are all fixed on the bracket, and one of the pulleys is located between the first fixing plate and the second fixing plate, and the other pulley is located between the second fixing plate and the third fixing plate.

[0010] Further, the first fixing plate, the second fixing plate, the third fixing plate and the bracket are in the same plane, and the first fixing plate, the second fixing plate and the third fixing plate are all vertically connected to the bracket, forming a "king" - shaped structure with the bracket.

[0011] Further, the bracket is composed of two vertical plates, the first fixing plate is composed of two first horizontal plates, the second fixing plate is composed of two second horizontal plates, and the third fixing plate is composed of two third horizontal plates; the first horizontal plate, the second horizontal plate and the third horizontal plate located on the front side are all fixed on the rear side surface of the vertical plate located on the front side, and the first horizontal plate, the second horizontal plate and the third horizontal plate located on the rear side are all fixed on the front side surface of the vertical plate located on the rear side, thus forming a pair of "king" - shaped brackets. After assembly, the "king" - shaped brackets are press - fitted and fixed into a "king" - shaped pulley frame; the two pulleys are clamped by the front and rear vertical plates through the corresponding press - fitting of the first horizontal plate, the second horizontal plate and the third horizontal plate, and there is a gap between the front and rear vertical plates due to the thickness of the first horizontal plate, the second horizontal plate and the third horizontal plate, and the gap between the front and rear vertical plates is slightly larger than the thickness of the pulley.

[0012] Furthermore, the vertical plates on both sides are provided with mounting holes, and all of the first transverse plates, the second transverse plates and the third transverse plates are provided with mounting blocks, and the first transverse plates, the second transverse plates and the third transverse plates are respectively fixedly mounted on the vertical plates on the same side by the cooperation between their respective mounting blocks and the corresponding mounting holes; at the same time, the first transverse plates, the second transverse plates and the third transverse plates are each divided into a pair of male transverse plates and a female transverse plate, the male transverse plates are provided with pressing blocks, and the female transverse plates are provided with pressing holes, and each pair of the male transverse plates and the female transverse plates are pressed and fixed by the cooperation between their respective pressing blocks and the pressing holes.

[0013] Furthermore, the vertical plate, the first horizontal plate, the second horizontal plate and the third horizontal plate are all made of plastic materials, or the vertical plate is made of metal material, the first horizontal plate, the second horizontal plate and the third horizontal plate are made of plastic material and are injection molded with the vertical plate.

[0014] Furthermore, the width of the vertical plate is smaller than the diameter of the pulley. Meanwhile, the width of the second transverse plate is slightly larger than the diameter of the pulley, and the left and right ends of the second transverse plate have the same thickness, so as to serve as a positioning slider when the pulley group moves in the pulley groove of the needle selection device.

[0015] Furthermore, the widths of the first transverse plate and the third transverse plate are equal, and the widths of the first transverse plate and the third transverse plate are slightly smaller than the width of the second transverse plate, or slightly larger than the width of the vertical plate.

[0016] Furthermore, the bearing assembly is a sliding bearing, the journal of the sliding bearing is arranged on the axis of the pulley, and the sleeves of the sliding bearing are respectively arranged on the vertical plates on the front and rear sides; the journal and the sleeve are made of metal materials with similar hardness, wherein the hardness rate of the sleeve is greater than the hardness of the journal; an oil storage tank is opened on the journal, and a sealing cover is arranged on the outer periphery of the sleeve.

[0017] Furthermore, the bearing assembly is a ball bearing, the body of the ball bearing is mounted on the axis of the pulley, and the rotating shaft of the ball bearing passes through the body and is fixed on the vertical plates on the front and rear sides.

[0018] Furthermore, a buffer and shock-absorbing structure is provided in the middle of the vertical plate by means of a groove.

[0019] The present invention also discloses a needle selection device, which is a double-action needle selection device and is equipped with the thin pulley block disclosed above.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The "W"-shaped frame design adopted in the present invention can enhance the structural stability of the bracket of the pulley block when the vertical plate is thinned. The shaft part supporting the pulley is changed from being stressed at the end of the cantilever beam fixed at one end to being stressed at the middle part fixed at both ends, thereby solving the "support" problem when the pulley shaft is stressed and solving the manufacturing difficulty of the ultra-thin pulley block.

[0022] 2. The "W"-shaped frame of the thin pulley block of the present invention is a combination of metal parts and injection molded parts, which is convenient for mass production and quality control.

[0023] 3. The thin pulley block of the present invention adopts a metal sliding bearing solution. Compared with the ultra-thin ball bearings which are difficult to manufacture and have high costs, the metal sliding bearings are more suitable for the ultra-thin pulley block and have lower costs.

[0024] 4. The middle part of the vertical plate of the thin pulley block of the present invention is designed with an elastic part for shock absorption, so as to buffer the vibration and impact during the operation of the mechanism and extend the working life of the pulley block.

[0025] 5. The thin pulley block of the present invention can fully achieve the design goal of reducing the thickness to 2-2.4 mm, opening up a larger design space for high-density needle selectors and even high-density jacquard machines.

[0026] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The specific implementation of the present invention is given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0028] Figure 1 It is a structural schematic diagram of a pulley block of a needle selection device in the prior art;

[0029] Figure 2 It is a structural schematic diagram of an embodiment of a thin pulley block of a needle selection device of the present invention;

[0030] Figure 3 An exploded view of a thin pulley block of a needle selection device of the present invention;

[0031] Figure 4 It is a schematic structural diagram of another embodiment of the thin pulley group of the needle selection device of the present invention. DETAILED DESCRIPTION

[0032] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. The description made herein is used to provide a further understanding of the present invention and constitutes a part of this application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0033] See Figure 2 As shown, a thin pulley set of a needle selection device mainly includes a bracket 1, two pulleys 2, a first fixing plate 3, a second fixing plate 4, and a third fixing plate 5; the two pulleys 2 are connected by the bracket 1, and the two pulleys 2 are rotatably installed on the bracket 1 through corresponding bearing assemblies; at the same time, the first fixing plate 3, the second fixing plate 4, and the third fixing plate 5 are all fixed on the bracket 1, and one of the pulleys 2 is located between the first fixing plate 3 and the second fixing plate 4, and the other pulley 2 is located between the second fixing plate 4 and the third fixing plate 5. The first fixing plate 3, the second fixing plate 4, the third fixing plate 5 and the bracket 1 are in the same plane, and the first fixing plate 3, the second fixing plate 4, and the third fixing plate 5 are all vertically connected to the bracket 1, forming a "king" - shaped structure with the bracket 1.

[0034] Further, see Figure 3 As shown, the bracket 1 is composed of two vertical plates 101, the first fixing plate 3 is composed of two first transverse plates 301, the second fixing plate 4 is composed of two second transverse plates 401, and the third fixing plate 5 is composed of two third transverse plates 501; the first transverse plate 301, the second transverse plate 401, and the third transverse plate 501 located on the front side are all fixed on the rear side of the vertical plate 101 located on the front side, and the first transverse plate 301, the second transverse plate 401, and the third transverse plate 501 located on the rear side are all fixed on the front side of the vertical plate 101 located on the rear side, thus forming a pair of "king" - shaped brackets, and the pair of "king" - shaped brackets are press - fitted and fixed into a "king" - shaped pulley frame after assembly.

[0035] The first fixing plate 3, the second fixing plate 4, and the third fixing plate 5 are press - fitted respectively through the pairwise corresponding connections of their respective first transverse plates 301, second transverse plates 401, and third transverse plates 501, and the two vertical plates 101 sandwich the two pulleys 2 through the press - fitting of the first fixing plate 3, the second fixing plate 4, and the third fixing plate 5. The assembly of the pulley assembly actually also includes an upper pulley wire and a lower pulley wire (not shown in the figure), so when pressing the two pulleys 2, the corresponding pulley wires are included.

[0036] There is a gap between the front and rear two vertical plates 101 due to the thickness of the first transverse plate 301, the second transverse plate 401 and the third transverse plate 501, and the gap between the front and rear two vertical plates 101 is slightly larger than the thickness of the pulley 2, so as to meet the rotation needs of the pulley 2.

[0037] At the same time, arc grooves are provided at the lower edge of the first transverse plate 301, the upper and lower edges of the second transverse plate 401, and the upper edge of the third transverse plate 501; the lower arc groove of the first fixed plate 3 and the upper arc groove of the second fixed plate 4, as well as the lower arc groove of the second fixed plate 4 and the upper arc groove of the third fixed plate 5 respectively constitute cavities for accommodating the pulley 2, and the diameter of the cavity is slightly larger than the diameter of the pulley 2, so as to avoid interference with the rotation of the pulley 2.

[0038] For further information, see Figure 3 As shown, the vertical plates 101 on both sides are provided with mounting holes 9, and all the first transverse plates 301, the second transverse plates 401 and the third transverse plates 501 are provided with mounting blocks 8. The first transverse plates 301, the second transverse plates 401 and the third transverse plates 501 are respectively fixedly installed on the vertical plates 101 on the same side by the cooperation of their respective mounting blocks 8 and the corresponding mounting holes 9; at the same time, the first transverse plates 301, the second transverse plates 401 and the third transverse plates 501 are divided into a pair of male transverse plates and a female transverse plate, the male transverse plates are provided with pressing blocks 7, and the female transverse plates are provided with pressing holes 6, and each pair of the male transverse plates and the female transverse plates are pressed and fixed by the cooperation of their respective pressing blocks 7 and the pressing holes 6.

[0039] Furthermore, the vertical plate 101, the first horizontal plate 301, the second horizontal plate 401 and the third horizontal plate 501 are all made of plastic materials, or the vertical plate 101 is made of metal material, the first horizontal plate 301, the second horizontal plate 401 and the third horizontal plate 501 are made of plastic material and are injection molded with the vertical plate 101, and the combination of metal parts and injection molded parts is convenient for mass production and quality control.

[0040] For further information, see Figure 3 As shown, the width of the vertical plate 101 is smaller than the diameter of the pulley 2. At the same time, the width of the second transverse plate 401 is slightly larger than the diameter of the pulley 2, and the left and right ends of the second transverse plate 401 have the same thickness, so as to serve as a positioning slider 10 when the pulley group moves in the pulley groove of the needle selection device.

[0041] Furthermore, the widths of the first transverse plate 301 and the third transverse plate 501 are equal. Figure 2 and 3 As shown, the widths of the first transverse plate 301 and the third transverse plate 501 are slightly smaller than the width of the second transverse plate 401. As another embodiment, see Figure 4 As shown, the widths of the first transverse plate 301 and the third transverse plate 501 have been greatly shortened, and are both significantly shorter than the width of the second transverse plate 401, and are only slightly larger than the width of the vertical plate 101. Both of these "W"-shaped pulley frame structures have three mechanical support points, so that the stress condition of the shaft end is effectively improved.

[0042] For further information, see Figure 3 As shown, the bearing assembly is a sliding bearing, the journal 11 of the sliding bearing is arranged on the axis of the pulley 2, the sleeve 12 of the sliding bearing is respectively arranged on the vertical plates 101 on the front and rear sides, the journal 11 is provided with an oil storage tank 13, and the outer periphery of the sleeve 12 is provided with a sealing cover 14. The journal 11 and the sleeve 12 are made of metal materials with similar hardness, wherein the hardness rate of the sleeve 12 is greater than the hardness of the journal 11. The metal sliding bearing solution is more suitable for ultra-thin pulley blocks and has lower cost.

[0043] Furthermore, of course, without considering the manufacturing cost and process, the bearing assembly can also be a ball bearing, the body of the ball bearing is installed on the axis of the pulley 2, and the rotating shaft of the ball bearing passes through the body and is fixed on the vertical plates 101 on the front and rear sides.

[0044] For further information, see Figure 4 As shown, the middle area of ​​the vertical plate 101 can be designed as an elastic buffer and shock absorbing structure 15 by grooving, so as to buffer the vibration and impact during the operation of the mechanism and extend the service life of the thin pulley block.

[0045] By adopting the above design, the structural stability of the support of the pulley block can be enhanced when the vertical plate is thinned, and the force on the end of the cantilever beam fixed at one end is changed to the force on the middle part fixed at both ends, which solves the "support" problem when the pulley shaft is under force and solves the manufacturing difficulty of the ultra-thin pulley block.

[0046] The present invention also discloses a needle selection device, which is a double-action needle selection device and is equipped with the thin pulley block disclosed above. The appearance of the thin pulley block of the present invention opens up a larger design space for high-density needle selection devices and even high-density jacquard machines.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A thin pulley block for a needle selection device, characterized in that: It includes a bracket (1), two pulleys (2), a first fixing plate (3), a second fixing plate (4) and a third fixing plate (5); the two pulleys (2) are connected by the bracket (1), and the two pulleys (2) are rotatably mounted on the bracket (1) through corresponding bearing assemblies; at the same time, the first fixing plate (3), the second fixing plate (4) and the third fixing plate (5) are all fixed on the bracket (1), the first fixing plate (3), the second fixing plate (4), the third fixing plate (5) and the bracket (1) are in the same plane, and the first fixing plate (3), the second fixing plate (4) and the third fixing plate (5) are all perpendicularly connected to the bracket (1), forming a "king" - shaped structure with the bracket (1), and one of the pulleys (2) is located between the first fixing plate (3) and the second fixing plate (4), and the other pulley (2) is located between the second fixing plate (4) and the third fixing plate (5).

2. The thin pulley block according to claim 1, characterized in that: The bracket (1) is composed of two vertical plates (101), the first fixing plate (3) is composed of two first transverse plates (301), the second fixing plate (4) is composed of two second transverse plates (401), and the third fixing plate (5) is composed of two third transverse plates (501); the first transverse plate (301), the second transverse plate (401) and the third transverse plate (501) located on the front side are all fixed on the rear side of the vertical plate (101) located on the front side, and the first transverse plate (301), the second transverse plate (401) and the third transverse plate (501) located on the rear side are all fixed on the front side of the vertical plate (101) located on the rear side, thus forming a pair of "king" - shaped brackets. After the "king" - shaped brackets are assembled, they are press - fitted and fixed into a "king" - shaped pulley frame; the two pulleys (2) are clamped by the corresponding pressing of the front and rear vertical plates (101) through the first transverse plate (301), the second transverse plate (401) and the third transverse plate (501). There is a gap between the front and rear vertical plates (101) due to the thickness of the first transverse plate (301), the second transverse plate (401) and the third transverse plate (501), and the gap between the front and rear vertical plates (101) is slightly larger than the thickness of the pulley (2).

3. The thin pulley block according to claim 2, characterized in that: The vertical plates (101) at the front and rear sides are provided with mounting holes (9), and all the first transverse plates (301), the second transverse plates (401) and the third transverse plates (501) are provided with mounting blocks (8). The first transverse plates (301), the second transverse plates (401) and the third transverse plates (501) are respectively fixedly mounted on the vertical plates (101) at the same side by the cooperation of their respective mounting blocks (8) and the corresponding mounting holes (9); at the same time, the first transverse plates (301), the second transverse plates (401) and the third transverse plates (501) are each divided into a pair of male transverse plates and a female transverse plate, the male transverse plates are provided with pressing blocks (7), and the female transverse plates are provided with pressing holes (6), and each pair of the male transverse plates and the female transverse plates are pressed and fixed by the cooperation of their respective pressing blocks (7) and the pressing holes (6).

4. The thin pulley block according to claim 2, characterized in that: The vertical plate (101), the first horizontal plate (301), the second horizontal plate (401) and the third horizontal plate (501) are all formed of plastic materials, or the vertical plate (101) is made of metal material, the first horizontal plate (301), the second horizontal plate (401) and the third horizontal plate (501) are made of plastic materials, and are injection molded with the vertical plate (101).

5. The thin pulley block according to claim 2, characterized in that: The width of the vertical plate (101) is smaller than the diameter of the pulley (2), and the width of the second transverse plate (401) is slightly larger than the diameter of the pulley (2), and the left and right ends of the second transverse plate (401) have the same thickness, so as to serve as a positioning slider (10) when the pulley group moves in the pulley groove of the needle selection device.

6. The thin pulley block according to claim 5, characterized in that: The widths of the first transverse plate (301) and the third transverse plate (501) are equal, and the widths of the first transverse plate (301) and the third transverse plate (501) are slightly smaller than the width of the second transverse plate (401), or slightly larger than the width of the vertical plate (101).

7. The thin pulley block according to claim 2, characterized in that: The bearing assembly is a sliding bearing, the journal (11) of the sliding bearing is arranged on the axis of the pulley (2), and the sleeve (12) of the sliding bearing is respectively arranged on the vertical plates (101) at the front and rear sides; the journal (11) and the sleeve (12) are made of metal materials with similar hardness, wherein the hardness of the sleeve (12) is greater than the hardness of the journal (11); an oil storage tank (13) is provided on the journal (11), and a sealing cover (14) is provided on the outer periphery of the sleeve (12).

8. The thin pulley block according to claim 2, characterized in that: The bearing assembly is a ball bearing, the body of the ball bearing is mounted on the axis of the pulley (2), and the rotating shaft of the ball bearing passes through the body and is fixed on the vertical plates (101) at the front and rear sides.

9. The thin pulley block according to claim 1, characterized in that: A buffering and shock-absorbing structure (15) is provided in the middle of the vertical plate (101) by means of a groove.

10. A needle selection device, characterized in that: The needle selection device is a double-action needle selection device and is equipped with a thin pulley block as described in any one of claims 1-9.

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