Circle setting mechanism of weft knitting machine

Abstract

The invention relates to the technical field of knitting, and provides a circle fixing mechanism of a weft knitting machine, the circle fixing mechanism comprises a plurality of supporting arms and circle fixing assemblies, the supporting arms are arranged around the central axis of an inner ring at intervals, the number of the circle fixing assemblies corresponds to the number of the supporting arms, and each circle fixing assembly is arranged on the corresponding supporting arm; the circle fixing assembly comprises a positioning block, a flatness adjusting piece and a coaxiality adjusting piece, the positioning block is installed on the supporting arm in a sliding mode, and the positioning block is provided with a supporting face used for supporting the bottom wall of the outer ring and an abutting face used for abutting against the peripheral wall of the outer ring; the flatness adjusting piece is arranged between the positioning block and the supporting arm and used for adjusting the height of the positioning block, and the coaxiality adjusting piece is arranged between the positioning block and the supporting arm and used for driving the positioning block to move in the radial direction of the outer ring. According to the circle fixing mechanism of the weft knitting machine, the stability of outer ring positioning can be improved.

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: A circle fixing mechanism of a weft knitting machine comprises a support arm and a circle fixing assembly, wherein a plurality of the support arms are arranged at intervals around the central axis of an inner ring, the circle fixing assemblies are arranged corresponding to the number of the support arms, and each of the circle fixing assemblies is arranged on a corresponding support arm; the circle fixing assembly comprises a positioning block, a flatness adjustment member and a coaxiality adjustment member, the positioning block is slidably mounted on the support arm, the positioning block has a supporting surface for supporting the bottom wall of the outer ring and an abutting surface for abutting the peripheral wall of the outer ring; the flatness adjustment member is arranged between the positioning block and the support arm for adjusting the height of the positioning block, and the coaxiality adjustment member is arranged between the positioning block and the support arm for driving the positioning block to move radially along the outer ring.

[0007] By adopting the above technical solution, through the arrangement of multiple support arms and circle fixing components, multiple support arms are dispersed on the outside of the outer ring for installation of the circle fixing components, thereby reducing the overall space occupancy rate; the positioning blocks in the multiple circle fixing components 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 member, and the flatness adjusting members in the multiple circle fixing components cooperate to make the flatness of the outer ring reach the standard; the positioning blocks in the multiple circle fixing components abut against the outer peripheral wall of the outer ring through the abutment surface, and the positioning blocks are driven to move radially along the outer ring through the coaxiality adjusting member, which can drive the outer ring to move radially, and the coaxiality adjusting members in the multiple circle fixing components 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 block is small in size, and it is easy to process a high-precision size, 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 and strong stability after adjustment, and is also not easy to have the problem of deformation and out-of-roundness of the existing integrated positioning ring that is difficult to correct, thereby greatly improving the stability of the outer ring coaxiality adjustment.

[0008] Optionally, the positioning block is provided with a first waist-shaped groove, the top wall of the support arm is provided with a first connecting hole, the positioning block is provided with a first bolt, the first bolt is sequentially passed through the first waist-shaped groove and the first connecting hole and is threadedly connected to the first connecting hole, the positioning block is installed on the support arm by the first bolt and can move radially along the outer ring; the flatness adjustment part 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 passes through the side wall of the gasket to form a notch of the avoidance groove.

[0009] By adopting the above-mentioned technical solution and setting a plurality of gaskets, after the positioning block is installed (the first bolt is not fully tightened), the gasket is inserted between the support arm and the corresponding positioning block, and different numbers of gaskets are inserted according to actual conditions. By selectively inserting different numbers of gaskets between multiple groups of support arms and positioning blocks for matching, the flatness of the outer ring meets the requirements.

[0010] Optionally, the coaxiality adjustment part includes an inclined push block and a driving screw, two of the inclined push blocks are provided, and the two inclined push blocks are slidably installed on the top wall of the support arm, and the moving direction of each inclined push block is perpendicular to the positioning block; the inclined push block has an inclined push surface, and when the two inclined push blocks approach each other, the inclined push surfaces of the two inclined push blocks jointly push the positioning block toward the center of the outer ring; the driving screw is sequentially passed through the two inclined push blocks, and the driving screw is threadedly connected to the two inclined push blocks, and when the driving screw is rotated, the two inclined push blocks approach each other or move away from each other.

[0011] By adopting the above technical solution, through the arrangement of the oblique push block and the driving screw, after the flatness of the outer ring is adjusted, the driving screw is rotated, and the driving screw and the two oblique push blocks are threadedly connected to each other, so as to be able to drive the two oblique push blocks to approach or move away from each other. When the two oblique push blocks approach each other, each oblique push block pushes the positioning block through its own oblique push surface, so that the positioning block can push the outer ring through the abutment surface, and the coaxiality adjustment parts of the multiple sets of fixed circle components cooperate to adjust the coaxiality of the outer ring so that the coaxiality of the outer ring meets the requirements; the arrangement of the two oblique push blocks, the two oblique push blocks can clamp the positioning block while pushing the positioning block, so that the positioning block can maintain linear displacement (i.e. radial displacement along the outer ring), reduce the possibility of swinging during the movement of the positioning block, and thereby improve the pushing effect of the positioning block on the outer ring.

[0012] Optionally, a fastening nut is sleeved on the outer peripheral wall of the driving screw, and the fastening nut is threadedly connected to the driving screw and abuts against the side wall of the oblique push block.

[0013] By adopting the above technical solution and setting the fastening nut, since the driving screw and the oblique push block are threadedly connected, there will inevitably be a thread gap in the thread matching (that is, even if the driving screw is not moving, the oblique push block may still have a small offset along the axial direction of the driving screw due to the existence of the thread gap). Therefore, when the positioning block is pressed against the outer ring, the fastening nut is rotated to make the fastening nut press against the side wall of the oblique push block to control the movement of the oblique push block, so that the oblique push block remains pressed against the positioning block. The fastening nut forms a secondary reinforcement for the driving screw, which greatly improves the structural stability of the positioning block after being pressed against the outer ring, and improves the adjustment accuracy.

[0014] Optionally, a straight push area is formed between the two oblique push blocks, and a straight push block is slidably installed in the straight push area, and the moving direction of the straight push block is consistent with the moving direction of the positioning block; a linkage member is provided between the straight push block and the two oblique push blocks, and when the two oblique push blocks approach each other to drive the positioning block to move toward the outer ring, the linkage member forces the straight push block to push the positioning block.

[0015] By adopting the above-mentioned technical scheme, through the setting of the straight push block and the linkage part, when the two oblique push blocks approach each other, the two oblique push blocks jointly push the positioning block to move, so as to adjust the coaxiality of the outer ring; during the movement of the oblique push block, the linkage part drives the straight push block to push the positioning block, the moving direction of the straight push block is consistent with the moving direction of the positioning block, the straight push block and the two oblique push blocks jointly act on the positioning block, forming 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.

[0016] Optionally, a push groove is provided on the side wall of the straight push block, and the linkage part includes two push oblique rods, and the two push oblique rods are arranged corresponding to the two oblique push blocks, one end of the push oblique rod is connected to the corresponding oblique push block, and the other end is inserted into the push groove of the straight push block, and the push oblique rod is gradually inclined toward the side away from the positioning block from the end away from the straight push block to the end close to the straight push block.

[0017] By adopting the above-mentioned technical solution and setting the pushing inclined rod, when the two inclined pushing blocks approach each other, the two pushing inclined rods are driven to approach each other, and the pushing inclined rod can push the straight pushing block to move through the inner wall of the pushing groove, so that the straight pushing block can push the positioning block, thereby improving the operational convenience of the overall structure.

[0018] Optionally, a clamping block is slidably installed in the pushing groove, and a clamping spring is provided on the inner wall of the clamping block and the pushing groove. When the two oblique pushing blocks approach each other, the end of the pushing oblique rod close to the straight pushing block pushes the clamping block to slide and forces the clamping spring to deform and generate elastic force.

[0019] By adopting the above-mentioned technical scheme, through the arrangement of the clamping block and the clamping spring, when the top pushing inclined rod drives the straight pushing block to displace, one end of the top pushing inclined rod can act on the clamping block, forcing the clamping block to slide and squeeze the clamping spring, and the elastic force of the clamping spring can react on the top pushing inclined rod, and then react on the oblique pushing block, so that the oblique pushing block has a tendency to retreat, thereby improving the tightness of the threaded fit between the oblique pushing block and the driving screw, and thereby reducing the possibility that the oblique pushing block may have a small offset along the axial direction of the driving screw (the existence of a thread gap).

[0020] Optionally, a straight push zone is formed between the two oblique push blocks, and a first push cam is provided on the outer peripheral wall of the driving screw. The first push cam is located in the straight push zone, and the peripheral wall of the first push cam abuts against the side wall of the positioning block away from the outer ring.

[0021] By adopting the above-mentioned technical solution, through the setting of the first pushing cam, the first pushing cam is set on the driving screw. When the driving screw rotates to drive the two inclined push blocks to approach each other, the first pushing 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 pushing cam and the two inclined push blocks act on the positioning block together 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.

[0022] Optionally, multiple first pushing cams are arranged at intervals along the length direction of the driving screw, and an anti-retreat zone is formed between two adjacent first pushing cams. The side wall of the positioning block away from the outer ring is provided with a limit strip located in the anti-retreat zone, and the limit strip has two first friction surfaces. The two first friction surfaces are arranged corresponding to the two first pushing cams, and each of the first push cams is provided with a second friction surface on the surface edge close to the anti-retreat zone, and the second friction surface abuts against the first friction surface corresponding to the limit strip.

[0023] By adopting the above-mentioned technical solution, through the setting of the limit strip, the driving screw drives the first pushing cam to rotate, so as to drive the first pushing cam to push the positioning block to move, the second friction surface of the first pushing cam and the first friction surface of the limit strip fit each other, thereby increasing the friction between the first pushing cam and the positioning block, and this friction makes it difficult for the positioning block to retract (in other words, when the positioning block retracts, the friction makes it difficult for the first pushing cam to rotate, thereby making it difficult for the positioning block to retract), improving the tightening effect of the first pushing cam on the positioning block, and thereby improving the accuracy of the outer ring coaxiality adjustment.

[0024] Optionally, the driving screw includes a first driving part, a second driving part and a synchronous part, the first driving part and the second driving part are coaxially arranged, the first driving part is threadedly penetrated into one of the inclined push blocks, and the second driving part is threadedly penetrated into the other inclined push block; the synchronous part is arranged between the first driving part and the second driving part, and the synchronous part is used to make the first driving part and the second driving part rotate synchronously and in opposite directions, when the first driving part and the second driving part rotate synchronously, the two inclined push blocks approach each other or move away from each other; the first pushing cam is arranged on the outer peripheral wall of the first driving part, and the outer peripheral wall of the second driving part is provided with the second pushing cam, the peripheral wall of the first pushing cam and the peripheral wall of the second pushing cam jointly abut against the side wall of the positioning block away from the outer ring.

[0025] By adopting the above-mentioned technical solution, the first driving part is driven to rotate through the setting of the second pushing cam, and the first driving part and the second driving part rotate synchronously under the action of the synchronous member to drive the two oblique pushing blocks to approach or move away from each other. When the two oblique pushing 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 direction of the first pushing cam and the rotation direction of the second pushing cam are opposite and act on the positioning block at the same time to push and tighten the positioning block, increase the contact area between the positioning block, and improve the tightening effect on the positioning block.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. Through the arrangement of multiple support arms and circle fixing components, multiple support arms are dispersed on the outside of the outer ring for installation of the circle fixing components, thereby reducing the overall space occupancy rate; the positioning blocks in the multiple circle fixing components 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 piece, and the flatness adjusting pieces in the multiple circle fixing components cooperate to make the flatness of the outer ring reach the standard; the positioning blocks in the multiple circle fixing components abut against the outer peripheral wall of the outer ring through the abutment surface, and the positioning blocks are driven to move radially along the outer ring through the coaxiality adjusting piece, which can drive the outer ring to move radially, and the coaxiality adjusting pieces in the multiple circle fixing components 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 block is small in size, and it is easy to process a high-precision size, 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 and strong stability after adjustment, and is also not easy to have the problem of deformation and out-of-roundness of the existing integrated positioning ring that is difficult to correct, which greatly improves the stability of the outer ring coaxiality adjustment; 2. Through the setting of the straight push block and the linkage, when the two oblique push blocks approach each other, the two oblique push blocks jointly push the positioning block to adjust the coaxiality of the outer ring; during the movement of the oblique push block, the linkage drives the straight push block to push the positioning block, and the moving direction of the straight push block is consistent with the moving direction of the positioning block. The straight push block and the two oblique push blocks jointly act 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; 3. Through the setting of the first pushing cam and the second pushing cam, the first driving part is driven to rotate, and the first driving part and the second driving part rotate synchronously under the action of the synchronous part to drive the two oblique pushing blocks to approach or move away from each other. When the two oblique pushing 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 direction of the first pushing cam and the rotation direction of the second pushing cam are opposite and act on the positioning block at the same time to push and tighten the positioning block, increase the contact area between the positioning block, and improve the tightening effect on the positioning block. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of the overall structure of Example 1; Figure 2 is a partial cross-sectional view of the supporting surface and the abutting surface of Embodiment 1; Figure 3 is an exploded schematic diagram of a gasket according to Embodiment 1; Figure 4 This is a schematic diagram of the structure of the oblique push block embodied in Example 1; Figure 5 This is a schematic diagram of the structure of the direct push block embodied in Example 2; Figure 6 is a partial cross-sectional view of the push diagonal rod embodying the second embodiment; Figure 7 is a schematic structural diagram of a first pushing cam according to Embodiment 3; Figure 8 is a partial cross-sectional view of the first push cam according to Embodiment 3; Fig. 9 is a schematic diagram of the structure of the limit strip in Example 4; Fig.10 is a schematic structural diagram of a first pushing cam and a second pushing cam according to Embodiment 5; Fig.11 It is a partial cross-sectional view of the first push cam and the second push cam embodied in Example 5.

[0028] Description of reference numerals: 1. support arm; 2. fixed circle assembly; 3. positioning block; 31. support surface; 32. abutment surface; 33. first waist-shaped groove; 34. first bolt; 35. limit strip; 351. first friction surface; 36. avoidance notch; 37. second waist-shaped groove; 38. second bolt; 39. contact surface; 391. chamfered surface; 4. gasket; 41. avoidance groove; 5. oblique push block; 51. oblique push surface; 52. straight push area; 53. Push diagonal rod; 54, third waist-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, active bevel gear; 67, driven bevel gear; 7, straight push block; 71, push groove; 72, pressing block; 73, pressing spring; 8, outer ring; 81, second connecting hole; 9, inner ring. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1 -Attached Fig.11 This application is described in further detail. Example 1

[0030] The embodiment of the present application discloses a circle-fixing mechanism for a weft knitting machine, which is used to be installed on the weft knitting machine to position an outer ring 8 of the weft knitting machine.

[0031] Reference Figure 1 , Figure 2 A circle fixing mechanism of a weft knitting machine includes a support arm 1 and a circle fixing assembly 2. The support arm 1 is installed on the frame surface of the weft knitting machine. A plurality of support arms 1 are provided. The plurality of support arms 1 are arranged at intervals around the central axis of an inner ring 9 of the weft knitting machine. The number of support arms 1 is at least four or more, and the number of support arms 1 is an even number. In this embodiment, the number of support arms 1 is set to six.

[0032] Reference Figure 2 , Figure 3 , the number of the circle-fixing components 2 is set corresponding to the number of the support arms 1, and each circle-fixing component 2 is installed on the top wall of the corresponding support arm 1 to position the outer ring 8; the circle-fixing component 2 includes a positioning block 3, a flatness adjustment member and a coaxiality adjustment member, the positioning block 3 is slidably installed on the top wall of the support arm 1, and the top wall of the positioning block 3 is provided with a first waist-shaped groove 33, the first waist-shaped groove 33 is a through groove penetrating the bottom wall of the positioning block 3, and the two ends of the first waist-shaped groove 33 are extended along the radial direction of the outer ring 8; the top wall of the support arm 1 is provided with a first connecting hole (not shown in the figure), and the positioning block 3 is installed with a first bolt 34, the first bolt 34 is sequentially penetrated through the first waist-shaped groove 33 and the first connecting hole and is threadedly connected to the first connecting hole, and 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.

[0033] Reference Figure 2 , Figure 3 The positioning block 3 has a supporting surface 31 and an abutting surface 32 respectively. 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 the outer peripheral wall of the outer ring 8. The abutting surface 32 is arranged in an arc shape, 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 and processing error of the abutting surface 32 of the positioning block 3, an avoidance notch 36 is opened on the abutting surface 32.

[0034] Reference Figure 2 , Figure 3 The support surface 31 is provided with a second waist-shaped groove 37, which is arc-shaped, and the central axis of the second waist-shaped groove 37 coincides with the central axis of the outer ring 8, and the bottom wall of the outer ring 8 is provided with a second connecting hole 81; the positioning block 3 is installed with a second bolt 38, and the second bolt 38 is sequentially passed through the second waist-shaped groove 37 and the second connecting hole 81 and is threadedly connected with the second connecting hole 81, and 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 outer ring 8 is provided with a plurality of second connecting holes 81, and the plurality of second connecting holes 81 are arranged at intervals around the central axis of the outer ring 8.

[0035] Reference Figure 2 , Figure 3 The 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 placed between the positioning block 3 and the support arm 1. An avoidance groove 41 for avoiding the first bolt 34 is opened on the surface of the gasket 4. 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.

[0036] Reference Figure 3 , Figure 4 , the coaxiality adjustment member is arranged between the positioning block 3 and the support arm 1 to drive the positioning block 3 to move radially along the outer ring 8, the coaxiality adjustment member includes an inclined push block 5 and a driving screw 6, two inclined push blocks 5 are arranged, the two inclined push blocks 5 are located on the side of the positioning block 3 away from the outer ring 8, the two inclined push blocks 5 are slidably installed on the top wall of the support arm 1, the top wall of the inclined push block 5 is provided with a third waist-shaped groove 54, the third waist-shaped groove 54 is a through groove penetrating the bottom wall of the inclined push block 5, and the length direction of the third waist-shaped groove 54 is perpendicular to the length direction of the first waist-shaped groove 33; the top wall of the support arm 1 is provided with a third connecting hole (not shown in the figure), the inclined push block 5 is installed with a third bolt 55, the third bolt 55 is sequentially penetrated through the third waist-shaped groove 54 and the third connecting hole and is threadedly connected with the third connecting hole, 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 the two inclined push blocks 5 are perpendicular to the moving direction of the positioning block 3.

[0037] Reference Figure 3 , Figure 4 For the convenience of description, the side wall of the positioning block 3 away from the outer ring 8 is defined as the contact surface 39 below. Chamfered surfaces 391 are provided on both sides of the contact surface 39. The two inclined push blocks 5 both have inclined push surfaces 51. The inclined push surfaces 51 of the two inclined push blocks 5 are arranged corresponding to the two chamfered surfaces 391 of the positioning block 3. The inclined push surfaces 51 of each inclined push block 5 abut 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 toward the center of the outer ring 8.

[0038] Reference Figure 3 , Figure 4 The driving screw 6 is rotatably installed on the top wall of the support arm 1. The driving screw 6 is sequentially passed through the two oblique push blocks 5, and the driving screw 6 and the two oblique push blocks 5 are threadedly connected. In this embodiment, the thread rotation directions of the driving screw 6 and the two oblique push blocks 5 are opposite, so that when the driving screw 6 is rotated, the two oblique push blocks 5 can approach or move away from each other; a rotation groove is opened on the end face of the driving screw 6, and the cross-sectional shape of the rotation groove is hexagonal. The rotation groove is used to connect the hexagonal wrench, thereby driving the driving screw 6 to rotate.

[0039] Reference Figure 3 , Figure 4 A fastening nut 61 is sleeved on the outer peripheral wall of the driving screw 6, and the fastening nut 61 is threadedly connected to the driving screw 6. There are two fastening nuts 61, and the two fastening nuts 61 are correspondingly arranged with the two oblique push blocks 5. The two fastening nuts 61 respectively abut against the side walls of the two oblique push blocks 5 that are away from each other.

[0040] The implementation principle of Example 1 of the present application is as follows: when positioning the outer ring 8, the flatness is adjusted first, and the first bolt 34 is not fully tightened, so that the positioning block 3 has a certain amount of activity space, and then the heights of the planes of the six positioning blocks 3 are adjusted by adding gaskets 4 so that the flatness of the outer ring 8 meets the requirements; after adjusting the flatness of a certain circumferential position of the outer ring 8, it is necessary to rotate the outer ring 8 to another circumferential position (at this time the flatness of the outer ring 8 will change), and then readjust the number of gaskets 4 to adjust the flatness of the outer ring 8 again, and repeat the above to ensure that the movement of the outer ring 8 within the circumferential range meets the flatness requirements.

[0041] After the flatness adjustment is completed, the driving screw 6 is driven to rotate, driving the two oblique push blocks 5 to approach each other. The two oblique push blocks 5 can push the positioning block 3 through their corresponding oblique push surfaces 51 to force the abutment 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 tightened in sequence to improve the convenience of positioning the outer ring 8.

[0042] By setting two oblique push blocks 5, the two oblique push blocks 5 push the positioning block 3 obliquely, so that the positioning block 3 can be clamped and limited during the process of pushing the positioning block 3, so that the positioning block 3 moves along the set trajectory, reducing the possibility of the positioning block 3 swinging around the central axis of the first bolt 34.

[0043] By setting up multiple positioning blocks 3, the positioning blocks 3 are smaller in size and can be easily processed into higher-precision sizes, with low processing difficulty and low cost. Compared with the positioning method of the positioning ring, the positioning method of multiple positioning blocks 3 has high adjustment flexibility and strong stability after adjustment. At the same time, it is not easy to have the problem of deformation and out-of-roundness that is difficult to correct in the existing integrated positioning ring, which greatly improves the stability of the coaxiality adjustment of the outer ring 8. Example 2

[0044] The embodiment of the present application discloses a circle fixing mechanism of a weft knitting machine.

[0045] Reference Figure 5 , Figure 6 The difference between the circular fixing mechanism of a weft knitting machine disclosed in the embodiment of the present application and the embodiment 1 is that: For the convenience of description, in this embodiment, the gap between the two oblique push blocks 5 is defined as a straight push area 52, and a straight push block 7 is slidably installed on the top wall of the support arm 1. The straight push block 7 is located in the straight push area 52, and the moving direction of the straight push block 7 is consistent with the moving direction of the positioning block 3; a linkage member is arranged between the straight push block 7 and the two oblique push blocks 5, and when the two oblique push blocks 5 approach 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.

[0046] Reference Figure 5 , Figure 6 The side wall of the straight push block 7 is provided with a push groove 71, and the linkage part includes two push inclined rods 53, and the two push inclined rods 53 are arranged corresponding to the two oblique push blocks 5, one end of the push inclined rod 53 is fixedly connected to the corresponding oblique push block 5, and the other end is inserted into the push groove 71 of the straight push block 7. In this embodiment, the two push inclined rods 53 are staggered along the height direction; 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.

[0047] Reference Figure 5 , Figure 6 A clamping block 72 is slidably installed in the pushing groove 71, and a clamping spring 73 is installed between the clamping block 72 and the inner wall of the pushing groove 71. One end of the clamping spring 73 is fixedly connected to the clamping block 72, and the other end is fixedly connected to the inner wall of the pushing groove 71. When the two oblique pushing blocks 5 approach each other, the ends of the two pushing oblique rods 53 close to the straight pushing block 7 both push the clamping block 72 to slide, and force the clamping spring 73 to deform and have elastic force.

[0048] The implementation principle of Example 2 of the present application is: when the two oblique push blocks 5 approach each other, they drive the two top push oblique rods 53 to approach each other, and the top push oblique rods 53 can push the straight push block 7 to move through the inner wall of the top push groove 71, so that the straight push block 7 can push the positioning block 3, and the straight push block 7 and the two oblique push blocks 5 act on the positioning block 3 together, forming a "three-point push" on the positioning block 3, thereby improving the pushing effect on the positioning block 3.

[0049] When the pushing inclined rod 53 drives the straight pushing block 7 to move, one end of the pushing inclined rod 53 can act on the clamping block 72, forcing the clamping block 72 to slide and squeeze the clamping spring 73. The elastic force of the clamping spring 73 can react on the pushing inclined rod 53, and then react on the oblique pushing block 5, so that the oblique pushing block 5 has a tendency to retreat, thereby improving the tightness of the threaded fit between the oblique pushing block 5 and the driving screw 6, and thereby reducing the possibility that the oblique pushing block 5 may have a small offset along the axial direction of the driving screw 6 (the existence of a thread gap). Example 3

[0050] The embodiment of the present application discloses a circle fixing mechanism of a weft knitting machine.

[0051] Reference Figure 7 , Figure 8 The difference between the circular fixing mechanism of a weft knitting machine disclosed in the embodiment of the present application and the embodiment 1 is that: In this embodiment, a first pushing cam 62 is fixedly mounted on the outer peripheral wall of the driving screw rod 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 .

[0052] The implementation principle of Example 3 of the present 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 push 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 push blocks 5 act on the positioning block 3 together to form a "three-point push" on the positioning block 3, so as to drive the positioning block 3 to move and improve the pushing effect on the positioning block 3. Example 4

[0053] The embodiment of the present application discloses a circle fixing mechanism of a weft knitting machine.

[0054] Reference Fig. 9 The difference between the circular fixing mechanism of a weft knitting machine disclosed in the embodiment of the present application and the embodiment 3 is that: In this embodiment, multiple first pushing cams 62 are arranged at intervals along the length direction of the driving screw 6, and an anti-retreat zone is formed between two adjacent first pushing cams 62. When the two inclined push 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.

[0055] Reference Fig. 9 The contact surface 39 of the positioning block 3 is fixedly installed with a limit strip 35, and both ends of the limit strip 35 are extended in the height direction. The limit strip 35 is located in the anti-retreat zone, and the number of the limit strips 35 is set corresponding to the number of the anti-retreat zones; the limit strip 35 has two first friction surfaces 351, and the two first friction surfaces 351 make the cross-sectional shape of the limit strip 35 triangular. The two first friction surfaces 351 are arranged corresponding to the two first pushing cams 62, and the surface edge of each first pushing cam 62 close to the anti-retreat zone is provided with a second friction surface 621, and the second friction surface 621 abuts against the first friction surface 351 corresponding to the limit strip 35; in this embodiment, the first friction surface 351 and the second friction surface 621 are both formed by grinding to form a surface with a certain roughness.

[0056] The implementation principle of Example 4 of the present application is: when the driving screw 6 drives the first pushing cam 62 to rotate, so as to drive the first pushing cam 62 to push the positioning block 3 to move, the second friction surface 621 of the first pushing cam 62 and the first friction surface 351 of the limit strip 35 fit each other, thereby increasing the friction force between the first pushing cam 62 and the positioning block 3. This friction force makes it difficult for the positioning block 3 to retreat, thereby increasing the tightening effect of the first pushing cam 62 on the positioning block 3, and thereby improving the accuracy of the coaxiality adjustment of the outer ring 8. Example 5

[0057] The embodiment of the present application discloses a circle fixing mechanism of a weft knitting machine.

[0058] Reference Fig.10 , Fig.11 The difference between the circular fixing mechanism of a weft knitting machine disclosed in the embodiment of the present application and the embodiment 3 is that: In this embodiment, the driving screw 6 includes a first driving part 63, a second driving part 64 and a synchronous part. The first driving part 63 and the second driving part 64 are coaxially arranged. The first driving part 63 is threadedly inserted into one of the inclined push blocks 5, and the second driving part 64 is threadedly inserted into the other inclined push block 5. It should be noted that the thread rotation direction between the first driving part 63 and the second driving part 64 in this embodiment is the same, and the rotating groove is set in the first driving part 63.

[0059] Reference Fig.10 , Fig.11 The synchronizer is arranged between the first driving part 63 and the second driving part 64. The synchronizer is used to make the first driving part 63 and the second driving part 64 rotate synchronously and in opposite directions. The synchronizer includes an active bevel gear 66 and a driven bevel gear 67. The active bevel gear 66 is rotatably mounted on the top wall of the support arm 1 and is located in the straight push area 52; there are two driven bevel gears 67, one of which is coaxially fixed to the end face of the first driving part 63, and the other is coaxially fixed to the end face of the second driving part 64. The active bevel gear 66 and the two driven bevel gears 67 are meshed for transmission; when the first driving part 63 and the second driving part 64 rotate synchronously, the two oblique push blocks 5 approach or move away from each other.

[0060] Reference Fig.10 , Fig.11 In this embodiment, the first pushing cam 62 is fixedly mounted on the outer peripheral wall of the first driving part 63, and the second pushing cam 65 is fixedly mounted on the outer peripheral wall of the second driving part 64. The first pushing cam 62 and the second pushing cam 65 have the same shape, and the peripheral wall of the first pushing cam 62 and the peripheral wall of the second pushing cam 65 are jointly in contact with the contact surface 39 of the positioning block 3.

[0061] The implementation principle of Example 5 of the present application is: the first driving part 63 is driven to rotate, and under the action of the active 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 oblique push blocks 5 to approach each other or move away from each other; when the two oblique push blocks 5 approach each other, the first driving part 63 drives the first pushing cam 62 and the second driving part 64 drives the second pushing cam 65 to rotate simultaneously, and the rotation direction of the first pushing cam 62 and the rotation direction of the second pushing cam 65 are opposite and act on the positioning block 3 at the same time, so as to push and tighten the positioning block 3, increase the contact area between the positioning block 3, and improve the tightening effect on the positioning block 3.

[0062] The above are preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present 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) for adjusting the height of the positioning block (3), and the coaxiality adjustment member is arranged between the positioning block (3) and the support arm (1) for driving the positioning block (3) to move radially along the outer ring (8).

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 coaxiality adjustment member comprises an inclined push block (5) and a driving screw (6). Two inclined push blocks (5) are provided. The two inclined push blocks (5) are both slidably mounted on the top wall of the support arm (1). The moving direction of each inclined push block (5) is perpendicular to the positioning block (3). The inclined push block (5) has an inclined push surface (51). 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) toward the center of the outer ring (8). The driving screw (6) is sequentially inserted into the two inclined push blocks (5), and the driving screw (6) is threadedly connected to the two inclined push blocks (5). When the driving screw (6) is rotated, the two inclined push blocks (5) are close to each other or away from each other.

4. A circular fixing mechanism for a weft knitting machine according to claim 3, 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).

5. The circular fixing mechanism of a weft knitting machine according to claim 3, characterized in that: A straight push area (52) is formed between the two oblique push blocks (5), and 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) approach 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).

6. A circular fixing mechanism for a weft knitting machine according to claim 5, characterized in that: The side wall of the straight push block (7) is provided with a push groove (71), and the linkage member comprises two push inclined rods (53), and the two push inclined rods (53) are 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).

7. A circular fixing mechanism for a weft knitting machine according to claim 6, characterized in that: A clamping block (72) is slidably installed in the pushing groove (71), and a clamping spring (73) is provided between the inner wall of the clamping block (72) and the pushing groove (71). When the two oblique pushing blocks (5) approach each other, one end of the pushing oblique rod (53) close to the straight pushing block (7) pushes the clamping block (72) to slide, and forces the clamping spring (73) to deform and generate elastic force.

8. The circular fixing mechanism of a weft knitting machine according to claim 3, characterized in that: A straight push area (52) is formed between the two oblique push blocks (5), and a first push cam (62) is provided on the outer peripheral wall of the driving screw (6). The first push cam (62) is located in the straight push area (52), and the peripheral wall of the first push cam (62) abuts against the side wall of the positioning block (3) away from the outer ring (8).

9. A circular fixing mechanism for a weft knitting machine according to claim 8, characterized in that: A plurality of the first pushing cams (62) are arranged at intervals along the length direction of the driving screw (6), and an anti-retraction zone is formed between two adjacent first pushing cams (62). A side wall of the positioning block (3) away from the outer ring (8) is provided with a limiting strip (35) located in the anti-retraction zone, and the limiting strip (35) has two first friction surfaces (351), and the two first friction surfaces (351) are arranged corresponding to the two first pushing cams (62). A second friction surface (621) is provided on the surface edge of each of the first pushing cams (62) close to the anti-retraction zone, and the second friction surface (621) abuts against the first friction surface (351) corresponding to the limiting strip (35).

10. The circular fixing mechanism of a weft knitting machine according to claim 8, characterized in that: The driving screw (6) comprises a first driving part (63), a second driving part (64) and a synchronous member. The first driving part (63) and the second driving part (64) are coaxially arranged. The first driving part (63) is threadedly arranged in one of the inclined push blocks (5), and the second driving part (64) is threadedly arranged in the other inclined push block (5). The synchronous member is arranged between the first driving part (63) and the second driving part (64). The synchronous member is used to make the first driving part (63) and the second driving part (64) rotate synchronously and in opposite directions. When the first driving part (63) and the second driving part (64) rotate synchronously, the two inclined push blocks (5) approach each other or move away from each other. The first pushing cam (62) is arranged on the outer peripheral wall of the first driving part (63), and the outer peripheral wall of the second driving part (64) is provided with a second pushing cam (65). The peripheral wall of the first pushing cam (62) and the peripheral wall of the second pushing cam (65) are jointly in contact with the side wall of the positioning block (3) away from the outer ring (8).

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