A fixed circle mechanism of a weft knitting machine

Abstract

The present application relates to the technical field of knitting, and provides a circular positioning mechanism for a weft knitting machine, which includes a support arm and a circular positioning assembly. A plurality of support arms are arranged at intervals around the central axis of the inner ring. The circular positioning assemblies are arranged corresponding to the number of support arms, and each circular positioning assembly is arranged on the corresponding support arm. The circular positioning assembly includes a positioning block, a flatness adjusting member, and a coaxiality adjusting member. The positioning block is slidably mounted on the support arm. The positioning block has a support surface for supporting the bottom wall of the outer ring and an abutting surface for abutting against the peripheral wall of the outer ring. The flatness adjusting member is arranged between the positioning block and the support arm to adjust the height of the positioning block, and the coaxiality adjusting member is arranged between the positioning block and the support arm to drive the positioning block to move along the radial direction of the outer ring. The circular positioning mechanism for a weft knitting machine of the present application can improve the stability of positioning the outer ring.

Description

Technical Field

[0001] The present application relates to the technical field of knitting, and in particular to a circle-fixing mechanism of a weft knitting machine. Background Art

[0002] Weft knitting machine is a kind of knitting machine used to knit weft knitted fabrics. The characteristic of this machine is that the yarn is fed into the knitting needles along the weft direction for knitting; the fixed circle of the weft knitting machine refers to the fixed cylindrical needle bed in the weft knitting machine, also known as the fixed needle cylinder. When the needle cylinder is fixed, the cam rotating around the needle cylinder pushes the latch needle to complete the looping process. This method is convenient for changing the position of the cam during operation to meet different knitting needs.

[0003] In the prior art, the outer ring of the weft knitting machine is fixed relative to the frame, the triangular seat is installed on the outer ring, the outer ring is stationary, the needle cylinder is fixed to the inner ring, the inner ring and the needle cylinder rotate relative to the triangular seat, so that the needle moves up and down, that is, the coaxiality of the outer ring relative to the inner ring is extremely critical, affecting the position of the yarn during the knitting process, thereby affecting the fabric forming effect. For the positioning of the coaxiality of the outer ring, an external fixed positioning ring is mainly used. The positioning ring fixes the outer ring, that is, the outer ring is stationary, and the inner ring rotates. The cross-section of the positioning ring is L-shaped, that is, the positioning ring has a step surface, and the plane of the step surface is used to resist the bottom surface of the outer ring to adjust the flatness of the outer ring. In order to ensure the flatness of the outer ring, a pad will be added on the plane of the step surface. The pads of different thicknesses are adjusted and then matched with the plane of the step surface to adjust the flatness of the outer ring. The annular surface of the step surface fits the outer circumference of the outer ring. The position of the outer ring is adjusted by adjusting the horizontal position of the positioning ring so that the outer ring and the inner ring are coaxial. At the same time, the positioning ring can clamp the outer ring and reduce the deformation of the outer ring, so that the roundness of the outer ring remains stable.

[0004] The above-mentioned related technical solutions have the following defects: first, the diameter of the positioning ring itself is relatively large, and the roundness of a workpiece with a large diameter is difficult to ensure, and the processing is difficult and the processing cost is high; second, since the positioning ring has a large diameter and occupies a large space, it is easy to deform during use, resulting in a decrease in the roundness of the positioning ring and affecting the accuracy of the outer ring; and since the positioning ring is integrally formed, once the positioning ring is deformed (possibly under the action of external forces, such as transportation collision or natural stress deformation), it is extremely difficult to correct the roundness of the positioning ring, resulting in a decrease in the accuracy of the outer ring, and therefore further improvement is needed. Summary of the invention

[0005] In order to improve the stability of the outer ring positioning, the present application provides a circle-fixing mechanism for a weft knitting machine.

[0006] The circular fixing mechanism of a weft knitting machine provided in the present application adopts the following technical solution:

[0007] A fixed circle mechanism for a weft knitting machine, comprising a support arm and a fixed circle assembly. A plurality of the support arms are arranged at intervals around the central axis of the inner circle. The number of the fixed circle assemblies corresponds to that of the support arms, and each fixed circle assembly is arranged on a corresponding support arm. The fixed circle assembly includes a positioning block, a flatness adjusting member and a coaxiality adjusting member. The positioning block is slidably mounted on the support arm. The positioning block has a support surface for supporting the bottom wall of the outer circle and an abutting surface for abutting against the peripheral wall of the outer circle. The flatness adjusting member is arranged between the positioning block and the support arm to adjust the height of the positioning block. The coaxiality adjusting member is arranged between the positioning block and the support arm to drive the positioning block to move radially along the outer circle.

[0008] By adopting the above technical solution, through the arrangement of a plurality of support arms and fixed circle assemblies, the plurality of support arms are dispersed on the outer side of the outer circle for the installation of the fixed circle assemblies, reducing the overall space occupancy rate. The positioning blocks in the plurality of fixed circle assemblies support the bottom wall of the outer circle through the support surface, and the height of the positioning blocks is adjusted by the flatness adjusting members. The flatness adjusting members in the plurality of fixed circle assemblies cooperate to make the flatness of the outer circle meet the standard. The positioning blocks in the plurality of fixed circle assemblies abut against the outer peripheral wall of the outer circle through the abutting surface, and the positioning blocks are driven to move radially along the outer circle by the coaxiality adjusting members, which can drive the outer circle to move radially. The coaxiality adjusting members in the plurality of fixed circle assemblies cooperate to adjust the coaxiality between the outer circle and the inner circle to make the coaxiality of the outer circle meet the standard. The positioning block has a small size, and it is easy to machine a dimension with high precision, with low processing difficulty and low cost. Compared with the positioning method of the positioning ring, the positioning method of a plurality of positioning blocks has a high adjustment flexibility, strong stability after adjustment, and is not prone to the problem that the deformation and out-of-roundness of the existing integral positioning ring are difficult to correct, greatly improving the stability of the coaxiality adjustment of the outer circle.

[0009] Optionally, the positioning block is provided with a first kidney-shaped groove, the top wall of the support arm is provided with a first connection hole, the positioning block is provided with a first bolt, the first bolt sequentially passes through the first kidney-shaped groove and the first connection hole and is threadedly connected to the first connection hole. The positioning block is mounted on the support arm by the first bolt and can move radially along the outer circle. The flatness adjusting member includes a plurality of gaskets. The plurality of gaskets are stacked in sequence and arranged between the positioning block and the support arm. The surface of the gasket is provided with an avoidance groove for avoiding the first bolt. One end of the avoidance groove penetrates through the side wall of the gasket to form a notch of the avoidance groove.

[0010] By adopting the above technical solution, through the arrangement of a plurality of gaskets, after the positioning block is installed (the first bolt is not fully tightened), gaskets are inserted between the support arm and the corresponding positioning block, and different numbers of gaskets are inserted according to the actual situation. By selecting and inserting different numbers of gaskets between multiple groups of support arms and positioning blocks for cooperation, the flatness of the outer circle meets the requirements.

[0011] Optionally, the coaxiality adjusting member includes an inclined pushing block and a driving screw. There are two inclined pushing blocks, and both of the two inclined pushing blocks are slidably mounted on the top wall of the support arm. The moving direction of each inclined pushing block is perpendicular to that of the positioning block. The inclined pushing block has an inclined pushing surface. When the two inclined pushing blocks approach each other, the inclined pushing surfaces of the two inclined pushing blocks jointly push the positioning block to move towards the center of the outer ring. The driving screw sequentially passes through the two inclined pushing blocks, and the driving screw is threadedly connected to both of the two inclined pushing blocks. When the driving screw is rotated, the two inclined pushing blocks approach or move away from each other.

[0012] By adopting the above technical solution, through the arrangement of the inclined pushing block and the driving screw, after the flatness of the outer ring is adjusted, the driving screw is rotated. The driving screw is threadedly connected to both of the two inclined pushing blocks, so as to drive the two inclined pushing blocks to approach or move away from each other. When the two inclined pushing blocks approach each other, each inclined pushing block pushes the positioning block through its respective inclined pushing surface, so that the positioning block can push the outer ring through the abutting surface. The coaxiality adjusting members of multiple fixed circle assemblies cooperate to adjust the coaxiality of the outer ring, so that the coaxiality of the outer ring meets the requirements. With the arrangement of the two inclined pushing blocks, while the two inclined pushing blocks push the positioning block, they can clamp the positioning block, so that the positioning block can maintain linear displacement (i.e., radial displacement along the outer ring), reducing the possibility of the positioning block swinging during the moving process, and further improving the pushing effect of the positioning block on the outer ring.

[0013] Optionally, a fastening nut is sleeved on the outer peripheral wall of the driving screw. The fastening nut is threadedly connected to the driving screw and abuts against the side wall of the inclined pushing block.

[0014] By adopting the above technical solution, through the arrangement of the fastening nut, since the driving screw and the inclined pushing block are threadedly connected, there will inevitably be a thread clearance in the thread fit (that is, even when the driving screw is in a stationary state, due to the existence of the thread clearance, the inclined pushing block may still have a small offset along the axial direction of the driving screw). Therefore, after the positioning block abuts tightly against the outer ring, the fastening nut is rotated to make the fastening nut abut against the side wall of the inclined pushing block to control the movement of the inclined pushing block and keep the inclined pushing block in a state of tightly abutting against the positioning block. The fastening nut forms secondary reinforcement for the driving screw, greatly improving the structural stability after the positioning block abuts tightly against the outer ring and improving the adjustment accuracy.

[0015] Optionally, a direct pushing area is formed between the two inclined pushing blocks. A direct pushing block is slidably mounted in the direct pushing area. The moving direction of the direct pushing block is the same as that of the positioning block. A linkage member is provided between the direct pushing block and the two inclined pushing blocks. When the two inclined pushing blocks approach each other to drive the positioning block to move towards the outer ring, the linkage member forces the direct pushing block to push the positioning block.

[0016] By adopting the above technical solution, through the arrangement of the direct push block and the linkage member, when the two inclined push blocks approach each other, the two inclined push blocks jointly push the positioning block to displace, so as to adjust the coaxiality of the outer ring; during the movement of the inclined push blocks, the linkage member drives the direct push block to push the positioning block, and the moving direction of the direct push block is the same as that of the positioning block. The direct push block and the two inclined push blocks jointly act on the positioning block to form a "three-point push" on the positioning block, so as to drive the positioning block to displace and improve the pushing effect on the positioning block.

[0017] Optionally, a push groove is formed in the side wall of the direct push block. The linkage member includes two push inclined rods. The two push inclined rods are arranged corresponding to the two inclined push blocks. One end of the push inclined rod is connected to the corresponding inclined push block, and the other end is inserted into the push groove of the direct push block. The push inclined rod is inclined gradually toward the side away from the positioning block from the end far from the direct push block to the end close to the direct push block.

[0018] By adopting the above technical solution, through the arrangement of the push inclined rods, when the two inclined push blocks approach each other, the two push inclined rods are driven to approach each other. The push inclined rod can push the direct push block to displace through the inner wall of the push groove, so that the direct push block can push the positioning block, improving the operation convenience of the overall structure.

[0019] Optionally, a pressing block is slidably installed in the push groove. A pressing spring is arranged between the pressing block and the inner wall of the push groove. When the two inclined push blocks approach each other, the end of the push inclined rod close to the direct push block pushes the pressing block to slide, and forces the pressing spring to deform and store elastic force.

[0020] By adopting the above technical solution, through the arrangement of the pressing block and the pressing spring, when the push inclined rod drives the direct push block to displace, one end of the push inclined rod can act on the pressing block, forcing the pressing block to slide and compress the pressing spring. The elastic force of the pressing spring can act on the push inclined rod in the reverse direction, and then act on the inclined push block in the reverse direction, so that the inclined push block has a tendency to retreat, improving the tightening degree of the threaded fit between the inclined push block and the driving screw, and further reducing the possibility that the inclined push block may have a small offset (due to the existence of thread clearance) along the axial direction of the driving screw.

[0021] Optionally, a direct push area is formed between the two inclined push blocks. A first push cam is arranged on the outer peripheral wall of the driving screw. The first push cam is located in the direct push area, and the peripheral wall of the first push cam abuts against the side wall of the positioning block far from the outer ring.

[0022] By adopting the above technical solution, through the setting of the first driving cam, the first driving cam is arranged on the driving screw. When the driving screw rotates to drive the two inclined pushing blocks to approach each other, the first driving cam can rotate around the central axis of the driving screw to push the side wall of the positioning block away from the outer ring. The first driving cam and the two inclined pushing blocks act together on the positioning block to form a "three-point push" on the positioning block, so as to drive the displacement of the positioning block and improve the pushing effect on the positioning block.

[0023] Optionally, a plurality of the first driving cams are arranged at intervals along the length direction of the driving screw. An anti-retreat area is formed between two adjacent first driving cams. A limiting strip located in the anti-retreat area is arranged on the side wall of the positioning block away from the outer ring. The limiting strip has two first friction surfaces, and the two first friction surfaces are correspondingly arranged with the two first driving cams. A second friction surface is arranged at the surface edge of each first driving cam close to the anti-retreat area, and the second friction surface abuts against the corresponding first friction surface of the limiting strip.

[0024] By adopting the above technical solution, through the setting of the limiting strip, when the driving screw drives the first driving cam to rotate to drive the first driving cam to push the positioning block to displace, the second friction surface of the first driving cam and the first friction surface of the limiting strip are mutually attached, so as to improve the friction force between the first driving cam and the positioning block. This friction force makes the positioning block not easy to retreat (in other words, when the positioning block retreats, the friction force makes the first driving cam not easy to rotate, so that the positioning block is not easy to retreat), improves the pressing effect of the first driving cam on the positioning block, and further improves the accuracy of the outer ring coaxiality adjustment.

[0025] Optionally, the driving screw includes a first driving part, a second driving part and a synchronizing part. The first driving part and the second driving part are coaxially arranged. The first driving part is threadedly penetrated through one of the inclined pushing blocks, and the second driving part is threadedly penetrated through the other inclined pushing block; the synchronizing part is arranged between the first driving part and the second driving part, and the synchronizing part is used to synchronize and reverse-rotate the first driving part and the second driving part. When the first driving part and the second driving part rotate synchronously, the two inclined pushing blocks approach or separate from each other; the first driving cam is arranged on the outer peripheral wall of the first driving part, and a second driving cam is arranged on the outer peripheral wall of the second driving part. The peripheral walls of the first driving cam and the second driving cam jointly abut against the side wall of the positioning block away from the outer ring.

[0026] By adopting the above technical solution, through the setting of the second driving cam, the first driving part is driven to rotate. The first driving part and the second driving part rotate synchronously under the action of the synchronizing part, so as to drive the two inclined push blocks to approach or move away from each other. When the two inclined push blocks approach each other, the first driving part drives the first pushing cam, and the second driving part drives the second pushing cam to rotate simultaneously. The rotation directions of the first pushing cam and the second pushing cam are opposite and act on the positioning block at the same time, so as to push and press the positioning block, increase the contact area with the positioning block, and improve the pressing effect on the positioning block.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. Through the setting of multiple support arms and the fixed circle assembly, the multiple support arms are dispersed on the outside of the outer ring for the installation of the fixed circle assembly, reducing the overall space occupancy rate; the positioning blocks in the multiple fixed circle assemblies are supported on the bottom wall of the outer ring through the support surface, and the height of the positioning blocks is adjusted by the flatness adjusting parts. The flatness adjusting parts in the multiple fixed circle assemblies cooperate to make the flatness of the outer ring reach the standard; the positioning blocks in the multiple fixed circle assemblies are abutted against the outer peripheral wall of the outer ring through the abutting surface, and the positioning blocks are driven to move radially along the outer ring by the coaxiality adjusting parts, which can drive the outer ring to move radially. The coaxiality adjusting parts in the multiple fixed circle assemblies cooperate to adjust the coaxiality between the outer ring and the inner ring, so that the coaxiality of the outer ring reaches the standard; the positioning blocks are small in size, and it is easy to machine dimensions with high precision, with low processing difficulty and low cost. Compared with the positioning method of the positioning ring, the positioning method of multiple positioning blocks has high adjustment flexibility, strong stability after adjustment, and it is not easy to have the problem that the deformation and out-of-roundness of the existing integral positioning ring are difficult to correct, greatly improving the stability of the coaxiality adjustment of the outer ring;

[0029] 2. Through the setting of the straight push block and the linkage part, when the two inclined push blocks approach each other, the two inclined push blocks jointly push the positioning block to displace to adjust the coaxiality of the outer ring; during the movement of the inclined push blocks, the straight push block is driven to push the positioning block by the linkage part. The moving direction of the straight push block is the same as the moving direction of the positioning block. The straight push block and the two inclined push blocks jointly act on the positioning block to form a "three-point push" on the positioning block, so as to drive the positioning block to displace and improve the pushing effect on the positioning block.

[0030] 3. By setting the first driving cam and the second driving cam, the first driving part is driven to rotate. Under the action of the synchronizing part, the first driving part and the second driving part rotate synchronously to drive the two inclined push blocks to approach or move away from each other. When the two inclined push blocks approach each other, the first driving part drives the first driving cam, and the second driving part drives the second driving cam to rotate simultaneously. The rotation directions of the first driving cam and the second driving cam are opposite and act on the positioning block at the same time to push and press the positioning block, increasing the contact area with the positioning block and improving the pressing effect on the positioning block. Description of the Drawings

[0031] Figure 1 is the overall structural schematic diagram of Embodiment 1;

[0032] Figure 2 is the partial cross-sectional view of Embodiment 1 showing the supporting surface and the abutting surface;

[0033] Figure 3 is the exploded schematic diagram of Embodiment 1 showing the gasket;

[0034] Figure 4 is the structural schematic diagram of Embodiment 1 showing the inclined push block;

[0035] Figure 5 is the structural schematic diagram of Embodiment 2 showing the straight push block;

[0036] Figure 6 is the partial cross-sectional view of Embodiment 2 showing the top push inclined rod;

[0037] Figure 7 is the structural schematic diagram of Embodiment 3 showing the first driving cam;

[0038] Figure 8 is the partial cross-sectional view of Embodiment 3 showing the first driving cam;

[0039] Figure 9 is the structural schematic diagram of Embodiment 4 showing the limiting strip;

[0040] Figure 10 is the structural schematic diagram of Embodiment 5 showing the first driving cam and the second driving cam;

[0041] Figure 11 is the partial cross-sectional view of Embodiment 5 showing the first driving cam and the second driving cam.

[0042] Description of reference numerals: 1. Support arm; 2. Fixed circle assembly; 3. Positioning block; 31. Support surface; 32. Abutting surface; 33. First kidney-shaped groove; 34. First bolt; 35. Limiting strip; 351. First friction surface; 36. Avoidance notch; 37. Second kidney-shaped groove; 38. Second bolt; 39. Contact surface; 391. Chamfered surface; 4. Gasket; 41. Avoidance groove; 5. Inclined push block; 51. Inclined push surface; 52. Straight push area; 53. Top push inclined rod; 54. Third kidney-shaped groove; 55. Third bolt; 6. Driving screw; 61. Fastening nut; 62. First pushing cam; 621. Second friction surface; 63. First driving part; 64. Second driving part; 65. Second pushing cam; 66. Driving bevel gear; 67. Driven bevel gear; 7. Straight push block; 71. Top push groove; 72. Tightening block; 73. Tightening spring; 8. Outer ring; 81. Second connection hole; 9. Inner ring. Detailed implementation manners

[0043] The following further describes the present application in detail with reference to the Figure 1 - attached Figure 11 drawings. Embodiment 1

[0044] The embodiment of the present application discloses a fixed circle mechanism of a weft knitting machine, which is used to be installed on the weft knitting machine to position the outer ring 8 of the weft knitting machine.

[0045] Referring to Figure 1 and Figure 2 , a fixed circle mechanism of a weft knitting machine includes a support arm 1 and a fixed circle assembly 2. The support arm 1 is installed on the surface of the frame of the weft knitting machine. There are multiple support arms 1, and the multiple support arms 1 are arranged at intervals around the central axis of the inner ring 9 of the weft knitting machine; the number of support arms 1 is at least four or more than four, and the number of support arms 1 is an even number. In this embodiment, the number of support arms 1 is set to six.

[0046] Referring to Figure 2 and Figure 3 , the number of the fixed circle assemblies 2 is correspondingly set to the number of the support arms 1. Each fixed circle assembly 2 is installed on the top wall of the corresponding support arm 1 to position the outer ring 8; the fixed circle assembly 2 includes a positioning block 3, a flatness adjusting member and a coaxiality adjusting member. The positioning block 3 is slidably installed on the top wall of the support arm 1. A first kidney-shaped groove 33 is formed in the top wall of the positioning block 3. The first kidney-shaped groove 33 is a through groove penetrating the bottom wall of the positioning block 3, and both ends of the first kidney-shaped groove 33 extend along the radial direction of the outer ring 8; a first connection hole (not shown in the figure) is formed in the top wall of the support arm 1. The positioning block 3 is provided with a first bolt 34. The first bolt 34 sequentially passes through the first kidney-shaped groove 33 and the first connection hole and is threadedly connected to the first connection hole. The positioning block 3 is installed on the top wall of the support arm 1 through the first bolt 34 and can move along the radial direction of the outer ring 8.

[0047] Reference Figure 2 and Figure 3 , the positioning blocks 3 respectively have a supporting surface 31 and an abutting surface 32. The supporting surface 31 is used to support the bottom wall of the outer ring 8, and the abutting surface 32 is used to abut against the outer peripheral wall of the outer ring 8. The abutting surface 32 is arc-shaped, and the central axis of the abutting surface 32 coincides with the central axis of the outer ring 8; in order to reduce the processing difficulty of the abutting surface 32 of the positioning block 3 and reduce the processing error, an avoidance notch 36 is provided on the abutting surface 32.

[0048] Reference Figure 2 and Figure 3 , a second kidney-shaped groove 37 is provided on the supporting surface 31. The second kidney-shaped groove 37 is arc-shaped, and the central axis of the second kidney-shaped groove 37 coincides with the central axis of the outer ring 8. A second connection hole 81 is provided on the bottom wall of the outer ring 8; a second bolt 38 is installed on the positioning block 3. The second bolt 38 sequentially passes through the second kidney-shaped groove 37 and the second connection hole 81 and is threadedly connected to the second connection hole 81. The positioning block 3 is detachably installed on the outer ring 8 through the second bolt 38; it should be noted that in this embodiment, the number of the second connection holes 81 of the outer ring 8 is provided with a plurality, and the plurality of second connection holes 81 are arranged at intervals around the central axis of the outer ring 8.

[0049] Reference Figure 2 and Figure 3 , a flatness adjusting member is arranged between the positioning block 3 and the support arm 1 to adjust the height of the positioning block 3. The flatness adjusting member includes a plurality of gaskets 4. The plurality of gaskets 4 are stacked in sequence along the height direction and are placed between the positioning block 3 and the support arm 1. An avoidance groove 41 for avoiding the first bolt 34 is provided on the surface of the gasket 4, and one end of the avoidance groove 41 penetrates through the side wall of the gasket 4 and forms a notch of the avoidance groove 41.

[0050] Reference Figure 3 and Figure 4 , a coaxiality adjusting member is arranged between the positioning block 3 and the support arm 1 to drive the positioning block 3 to move along the radial direction of the outer ring 8. The coaxiality adjusting member includes an inclined push block 5 and a driving screw 6. There are two inclined push blocks 5. Both of the two inclined push blocks 5 are located on the side of the positioning block 3 away from the outer ring 8. Both of the two inclined push blocks 5 are slidably installed on the top wall of the support arm 1. A third kidney-shaped groove 54 is provided on the top wall of the inclined push block 5. The third kidney-shaped groove 54 is a through groove penetrating the bottom wall of the inclined push block 5, and the length direction of the third kidney-shaped groove 54 is perpendicular to the length direction of the first kidney-shaped groove 33; a third connection hole (not shown in the figure) is provided on the top wall of the support arm 1. A third bolt 55 is installed on the inclined push block 5. The third bolt 55 sequentially passes through the third kidney-shaped groove 54 and the third connection hole and is threadedly connected to the third connection hole. Both of the two inclined push blocks 5 are slidably installed on the top wall of the support arm 1 through their respective corresponding third bolts 55, and the moving directions of both of the two inclined push blocks 5 are perpendicular to the moving direction of the positioning block 3.

[0051] ReferenceFigure 3 , Figure 4 , for ease of description, the side wall of the positioning block 3 away from the outer ring 8 is hereinafter defined as the contact surface 39. Chamfered surfaces 391 are provided on both sides of the contact surface 39. Both of the two inclined push blocks 5 have inclined push surfaces 51. The inclined push surfaces 51 of the two inclined push blocks 5 are correspondingly arranged with the two chamfered surfaces 391 of the positioning block 3. The inclined push surface 51 of each inclined push block 5 abuts against the corresponding chamfered surface 391. When the two inclined push blocks 5 approach each other, the inclined push surfaces 51 of the two inclined push blocks 5 jointly push the positioning block 3 to move towards the center of the outer ring 8.

[0052] Refer to Figure 3 , Figure 4 , the driving screw 6 is rotatably installed on the top wall of the support arm 1. The driving screw 6 sequentially passes through the two inclined push blocks 5, and the driving screw 6 is threadedly connected to both of the two inclined push blocks 5. In this embodiment, the thread helix directions between the driving screw 6 and the two inclined push blocks 5 are set in opposite directions, so that when the driving screw 6 is rotated, the two inclined push blocks 5 can approach or move away from each other; a rotating groove is formed in the end surface of the driving screw 6, and the cross-sectional shape of the rotating groove is hexagonal. The rotating groove is used to dock with a hexagonal wrench to drive the driving screw 6 to rotate.

[0053] Refer to Figure 3 , Figure 4 , a fastening nut 61 is sleeved on the outer peripheral wall of the driving screw 6. The fastening nut 61 is threadedly connected to the driving screw 6. The number of the fastening nuts 61 is two. The two fastening nuts 61 are correspondingly arranged with the two inclined push blocks 5. The two fastening nuts 61 respectively abut against the side walls of the two inclined push blocks 5 away from each other.

[0054] The implementation principle of Embodiment 1 of this application is as follows: When positioning the outer ring 8, first, the flatness is adjusted. The first bolt 34 is not fully tightened, so that the positioning block 3 has a certain movement space. Then, the height of the planes of the six positioning blocks 3 is adjusted by adding gaskets 4, so that the flatness of the outer ring 8 meets the requirements; when the flatness of a certain circumferential position of the outer ring 8 is adjusted, the outer ring 8 needs to be rotated to another circumferential position (at this time, the flatness of the outer ring 8 will change), and then the number of gaskets 4 is readjusted to readjust the flatness of the outer ring 8 again. Repeat the above to ensure that the movement of the outer ring 8 within the circumferential range meets the flatness requirements.

[0055] After the flatness adjustment is completed, the driving screw 6 is driven to rotate, driving the two inclined push blocks 5 to approach each other. The two inclined push blocks 5 can push the positioning block 3 through their respective corresponding inclined push surfaces 51, so as to force the abutting surface 32 of the positioning block 3 to push the outer ring 8. By adjusting the horizontal movement of the six positioning blocks 3, the coaxiality between the outer ring 8 and the inner ring 9 is adjusted. After the coaxiality adjustment is completed, the first bolt 34, the third bolt 55, and the second bolt 38 are sequentially tightened to improve the convenience of positioning the outer ring 8.

[0056] Through the arrangement of two inclined pushing blocks 5, the two inclined pushing blocks 5 push the positioning block 3 obliquely, so that the positioning block 3 can be clamped and limited while being pushed, and the positioning block 3 can move along the set track, reducing the possibility of the positioning block 3 swinging around the central axis of the first bolt 34.

[0057] Through the arrangement of multiple positioning blocks 3, the positioning blocks 3 are small in size, and it is easy to machine dimensions with high precision, with low processing difficulty and low cost. Compared with the positioning method of the positioning ring, the positioning method using multiple positioning blocks 3 has a high adjustment flexibility, strong stability after adjustment, and is not prone to the problem that the deformation and out-of-roundness of the existing integral positioning ring are difficult to correct, greatly improving the stability of the coaxiality adjustment of the outer ring 8. Embodiment 2

[0058] The embodiment of the present application discloses a fixed circle mechanism of a weft knitting machine.

[0059] Refer to Figure 5 、 Figure 6 The difference between the fixed circle mechanism of the weft knitting machine disclosed in the embodiment of the present application and that of Embodiment 1 is as follows:

[0060] For the convenience of description, in this embodiment, the gap between the two inclined pushing blocks 5 is defined as the direct pushing area 52. A direct pushing block 7 is slidably installed on the top wall of the support arm 1. The direct pushing block 7 is located in the direct pushing area 52, and the moving direction of the direct pushing block 7 is the same as the moving direction of the positioning block 3; a linkage member is provided between the direct pushing block 7 and the two inclined pushing blocks 5. When the two inclined pushing blocks 5 approach each other to drive the positioning block 3 to move towards the outer ring 8, the linkage member forces the direct pushing block 7 to push the positioning block 3.

[0061] Refer to Figure 5 、 Figure 6 As shown in, a pushing groove 71 is formed in the side wall of the direct pushing block 7. The linkage member includes two pushing inclined rods 53. The two pushing inclined rods 53 are arranged corresponding to the two inclined pushing blocks 5. One end of the pushing inclined rod 53 is fixedly connected to the corresponding inclined pushing block 5, and the other end is inserted into the pushing groove 71 of the direct pushing block 7. In this embodiment, the two pushing inclined rods 53 are arranged in a staggered manner in the height direction; the pushing inclined rod 53 is inclined towards the side away from the positioning block 3 gradually from the end away from the direct pushing block 7 to the end close to the direct pushing block 7.

[0062] Refer to Figure 5 、 Figure 6 As shown in, a pressing block 72 is slidably installed in the pushing groove 71. A pressing spring 73 is installed between the pressing block 72 and the inner wall of the pushing groove 71. One end of the pressing spring 73 is fixedly connected to the pressing block 72, and the other end is fixedly connected to the inner wall of the pushing groove 71. When the two inclined pushing blocks 5 approach each other, the ends of the two pushing inclined rods 53 close to the direct pushing block 7 both push the pressing block 72 to slide, and force the pressing spring 73 to deform and store elastic force.

[0063] The implementation principle of Embodiment 2 of this application is as follows: When the two inclined pushing blocks 5 approach each other, they drive the two pushing inclined rods 53 to approach each other. The pushing inclined rod 53 can push the straight pushing block 7 to displace through the inner wall of the pushing groove 71, so that the straight pushing block 7 can push the positioning block 3. The straight pushing block 7 and the two inclined pushing blocks 5 act together on the positioning block 3 to form a "three-point push" on the positioning block 3, improving the pushing effect on the positioning block 3.

[0064] When the pushing inclined rod 53 drives the straight pushing block 7 to displace, one end of the pushing inclined rod 53 can act on the abutting block 72, forcing the abutting block 72 to slide and compress the abutting spring 73. The elastic force of the abutting spring 73 can act on the pushing inclined rod 53 in the opposite direction, and then act on the inclined pushing block 5 in the opposite direction, so that the inclined pushing block 5 has a tendency to retract, improving the tightening degree of the threaded fit between the inclined pushing block 5 and the driving screw 6, and further reducing the possibility that the inclined pushing block 5 may have a small offset (due to the existence of thread clearance) along the axial direction of the driving screw 6. Embodiment 3

[0065] This application embodiment discloses a fixed circle mechanism of a weft knitting machine.

[0066] Referring to Figure 7 、 Figure 8 The difference between the fixed circle mechanism of a weft knitting machine disclosed in this application embodiment and Embodiment 1 is that:

[0067] In this embodiment, a first pushing cam 62 is fixedly installed on the outer peripheral wall of the driving screw 6. The first pushing cam 62 is located in the straight pushing area 52, and the peripheral wall of the first pushing cam 62 abuts against the contact surface 39 of the positioning block 3.

[0068] The implementation principle of Embodiment 3 of this application is as follows: The first pushing cam 62 is arranged on the driving screw 6. When the driving screw 6 rotates to drive the two inclined pushing blocks 5 to approach each other, the first pushing cam 62 can rotate around the central axis of the driving screw 6 to push the side wall of the positioning block 3 away from the outer ring 8. The first pushing cam 62 and the two inclined pushing blocks 5 act together on the positioning block 3 to form a "three-point push" on the positioning block 3 to drive the positioning block 3 to displace, improving the pushing effect on the positioning block 3. Embodiment 4

[0069] This application embodiment discloses a fixed circle mechanism of a weft knitting machine.

[0070] Referring to Figure 9 The difference between the fixed circle mechanism of a weft knitting machine disclosed in this application embodiment and Embodiment 3 is that:

[0071] In this embodiment, a plurality of first pushing cams 62 are arranged at intervals along the length direction of the driving screw 6. An anti-retreat area is formed between two adjacent first pushing cams 62. When the two inclined pushing blocks 5 approach each other to push the positioning block 3, the outer peripheral walls of all the first pushing cams 62 simultaneously push the contact surface 39 of the positioning block 3.

[0072] Referring to Figure 9 , a limiting strip 35 is fixedly installed on the contact surface 39 of the positioning block 3. Both ends of the limiting strip 35 extend along the height direction. The limiting strip 35 is located in the anti-retreat area, and the number of the limiting strips 35 corresponds to the number of the anti-retreat areas; the limiting strip 35 has two first friction surfaces 351, and the cross-sectional shape of the limiting strip 35 is triangular due to the two first friction surfaces 351. The two first friction surfaces 351 correspond to the two first pushing cams 62. A second friction surface 621 is arranged at the surface edge of each first pushing cam 62 close to the anti-retreat area, and the second friction surface 621 abuts against the corresponding first friction surface 351 of the limiting strip 35; in this embodiment, both the first friction surface 351 and the second friction surface 621 are formed into surfaces with a certain roughness by grinding.

[0073] The implementation principle of Embodiment 4 of this application is as follows: When the driving screw 6 drives the first pushing cam 62 to rotate to drive the first pushing cam 62 to push the positioning block 3 to displace, the second friction surface 621 of the first pushing cam 62 fits with the first friction surface 351 of the limiting strip 35, so as to increase the friction force between the first pushing cam 62 and the positioning block 3. This friction force makes the positioning block 3 not easily retract, improves the pressing effect of the first pushing cam 62 on the positioning block 3, and further improves the accuracy of the coaxiality adjustment of the outer ring 8. Embodiment 5

[0074] The embodiment of this application discloses a fixed circle mechanism of a weft knitting machine.

[0075] Referring to Figure 10 、 Figure 11 , the difference between the fixed circle mechanism of the weft knitting machine disclosed in the embodiment of this application and Embodiment 3 is as follows:

[0076] In this embodiment, the driving screw 6 includes a first driving part 63, a second driving part 64 and a synchronizing member. The first driving part 63 and the second driving part 64 are coaxially arranged. The first driving part 63 is threadedly penetrated through one of the inclined pushing blocks 5, and the second driving part 64 is threadedly penetrated through the other inclined pushing block 5. It should be noted that the thread helix directions between the first driving part 63 and the second driving part 64 in this embodiment are the same, and the rotating groove is arranged on the first driving part 63.

[0077] Referring to Figure 10 、 Figure 11, A synchronizer is disposed between the first driving part 63 and the second driving part 64. The synchronizer is used to synchronize and reverse the rotation of the first driving part 63 and the second driving part 64. The synchronizer includes a driving bevel gear 66 and a driven bevel gear 67. The driving bevel gear 66 is rotatably mounted on the top wall of the support arm 1 and is located within the direct push area 52; there are two driven bevel gears 67. One of the driven bevel gears 67 is coaxially fixed to the end face of the first driving part 63, and the other driven bevel gear 67 is coaxially fixed to the end face of the second driving part 64. The driving bevel gear 66 meshes with both of the two driven bevel gears 67; when the first driving part 63 and the second driving part 64 rotate synchronously, the two inclined push blocks 5 approach or move away from each other.

[0078] Refer to Figure 10 , Figure 11 , In this embodiment, the first push cam 62 is fixedly mounted on the outer peripheral wall of the first driving part 63, and the second push cam 65 is fixedly mounted on the outer peripheral wall of the second driving part 64. The first push cam 62 and the second push cam 65 have the same shape. The peripheral walls of the first push cam 62 and the second push cam 65 jointly abut against the contact surface 39 of the positioning block 3.

[0079] The implementation principle of Embodiment 5 of this application is as follows: Drive the first driving part 63 to rotate. Under the action of the driving bevel gear 66 and the driven bevel gear 67, the first driving part 63 and the second driving part 64 can rotate synchronously and the rotation directions of the first driving part 63 and the second driving part 64 are opposite, thereby forcing the two inclined push blocks 5 to approach or move away from each other; when the two inclined push blocks 5 approach each other, the first driving part 63 drives the first push cam 62, and the second driving part 64 drives the second push cam 65 to rotate simultaneously. The rotation directions of the first push cam 62 and the second push cam 65 are opposite and act on the positioning block 3 simultaneously to push and press the positioning block 3, increasing the contact area with the positioning block 3 and improving the pressing effect on the positioning block 3.

[0080] The above is the preferred embodiment of this application. It does not limit the protection scope of this application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A circular fixing mechanism for a weft knitting machine, characterized in that: The invention comprises a support arm (1) and a circle fixing component (2), wherein a plurality of the support arms (1) are arranged at intervals around the central axis of the inner ring (9), the circle fixing components (2) are arranged in a corresponding manner to the number of the support arms (1), and each circle fixing component (2) is arranged on the corresponding support arm (1); the circle fixing component (2) comprises a positioning block (3), a flatness adjustment member and a coaxiality adjustment member, the positioning block (3) is slidably mounted on the support arm (1), the positioning block (3) has a supporting surface (31) for supporting the bottom wall of the outer ring (8) and an abutting surface (32) for abutting the peripheral wall of the outer ring (8); the flatness adjustment member is arranged between the positioning block (3) and the support arm (1) to adjust the height of the positioning block (3), and the coaxiality adjustment member is arranged The coaxial adjustment member comprises an inclined push block (5) and a driving screw (6), wherein two inclined push blocks (5) are provided, and the two inclined push blocks (5) are both slidably mounted on the top wall of the supporting arm (1), and the moving direction of each inclined push block (5) and the positioning block (3) are both arranged perpendicularly; the inclined push block (5) has an inclined push surface (51), and when the two inclined push blocks (5) are close to each other, the inclined push surfaces (51) of the two inclined push blocks (5) jointly push the positioning block (3) to move toward the center of the outer ring (8); the driving screw (6) is sequentially passed through the two inclined push blocks (5), and the driving screw (6) and the two inclined push blocks (5) are arranged perpendicularly to each other. The oblique push blocks (5) are all threadedly connected. When the driving screw (6) is rotated, the two oblique push blocks (5) move closer to or farther away from each other. A straight push area (52) is formed between the two oblique push blocks (5). A straight push block (7) is slidably installed in the straight push area (52). The moving direction of the straight push block (7) is consistent with the moving direction of the positioning block (3). A linkage member is provided between the straight push block (7) and the two oblique push blocks (5). When the two oblique push blocks (5) move closer to each other to drive the positioning block (3) to move toward the outer ring (8), the linkage member forces the straight push block (7) to push the positioning block (3). A push groove (71) is provided on the side wall of the straight push block (7). The linkage member includes two push inclined rods (53). The two push rods The inclined rod (53) is arranged corresponding to the two inclined push blocks (5), one end of the push inclined rod (53) is connected to the corresponding inclined push block (5), and the other end is inserted into the push groove (71) of the straight push block (7), and the push inclined rod (53) is gradually inclined from the end away from the straight push block (7) to the end close to the straight push block (7) toward the side away from the positioning block (3); a clamping block (72) is slidably installed in the push groove (71), and a clamping spring (73) is provided on the inner wall of the clamping block (72) and the push groove (71). When the two inclined push blocks (5) approach each other, the end of the push inclined rod (53) close to the straight push block (7) pushes the clamping block (72) to slide, and forces the clamping spring (73) to deform and have elastic force.

2. A circular fixing mechanism for a weft knitting machine according to claim 1, characterized in that: The positioning block (3) is provided with a first waist-shaped groove (33), the top wall of the support arm (1) is provided with a first connecting hole, the positioning block (3) is provided with a first bolt (34), the first bolt (34) is sequentially passed through the first waist-shaped groove (33) and the first connecting hole and is threadedly connected to the first connecting hole, the positioning block (3) is installed on the support arm (1) through the first bolt (34) and can move radially along the outer ring (8); the flatness adjustment member includes a plurality of gaskets (4), the plurality of gaskets (4) are sequentially stacked and arranged between the positioning block (3) and the support arm (1), the surface of the gasket (4) is provided with an avoidance groove (41) for avoiding the first bolt (34), one end of the avoidance groove (41) passes through the side wall of the gasket (4) and forms a notch of the avoidance groove (41).

3. A circular fixing mechanism for a weft knitting machine according to claim 1, characterized in that: The outer peripheral wall of the driving screw rod (6) is sleeved with a fastening nut (61), and the fastening nut (61) is threadedly connected to the driving screw rod (6) and abuts against the side wall of the inclined push block (5).

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