Cam and cam structure of large circular knitting machine
The cam structure for large circular knitting machines addresses the issue of reduced loop density by optimizing the needle movement groove width and incorporating adjustable components, resulting in improved loop density and operational efficiency.
Patent Information
- Application Number
- JP2023190347
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2023-07-05
- Filing Date
- 2023-11-07
- Publication Date
- 2025-01-20
- Estimated Expiration
- 2043-11-07
AI Technical Summary
The width of the needle movement groove in conventional cams for large circular knitting machines is relatively wide, leading to increased stroke due to inertia, which decreases the density of knitted loops.
The cam structure features a needle movement groove with a width of 3.1 mm to 3.3 mm, including ascending, descending, and thread hooking grooves, with specific arc formations and guide blocks to stabilize the knitting needle movement, and an adjustable design using connecting bolts and adjustment assemblies to maintain optimal groove width.
This design reduces the stroke of the knitting needle, increasing loop density by 5 to 10 meshes per inch, enhances stability, and allows for quick adjustments to maintain efficient operation.
Smart Images
Figure 2025009688000001_ABST
Abstract
Description
[Technical field]
[0001] The present invention relates to the technical field of large circular knitting machines, and in particular to a cam and a cam structure for a large circular knitting machine. [Background technology]
[0002] Knitted circular weft knitting machines are commonly called knitted large circular knitting machines (or knitted circular weft knitting machines). Knitted large circular knitting machines have many knitting systems (known in the industry as the number of yarn feeders or the number of knit feeders, abbreviated as the number of feeders), a high rotation speed, high production volume, easy pattern change, good knitting quality, few processes, and high product compatibility, and so have been developed rapidly. Knitted large circular knitting machines are composed of a frame, knitting mechanism, yarn feeding mechanism, transmission mechanism, lubrication and dust removal mechanism, electric control mechanism, tension winding mechanism, and other auxiliary devices. Among them, the knitting mechanism corresponds to the heart of the knitted large circular knitting machine, and is mainly composed of parts such as cylinders, knitting needles, cams, cam seats (saddles), and sinkers (only for single-sided knitting machines). The cam is also called a triangle, and it controls the knitting needles and sinkers to move back and forth in the cylinder groove according to the type of knitting of the knitted large circular knitting machine. There are five types of cams: knit cams, tuck cams, stitch cams, welt cams, and needle cams.
[0003] Conventionally, the cam includes a cam body, and the cam body is provided with a needle insertion groove, a needle operation groove, and a needle exit groove in this order along the movement direction of the knitting needle, and the needle groove includes an ascending groove, a descending groove, a thread hooking groove, and a knitting groove which are provided in this order on the cam body, and the needle insertion groove is connected to the ascending groove and a first circular arc is formed at the point where it is connected to the ascending groove, and a second circular arc is formed at the point where the ascending groove is connected to the descending groove, and the knitting groove is connected to the needle exit groove and a third circular arc is formed at the point where it is connected to the needle exit groove, and the widths of the ascending groove, the descending groove, the thread hooking groove, and the knitting groove are all 6.5 mm, that is, the width of the needle operation groove is 6.5 mm. The knitting needle enters the ascending groove from the needle insertion groove, then passes through the descending groove, then enters the thread hooking groove, then enters the knitting groove, and finally moves out of the cam body from the needle exit groove.
[0004] In the process of realizing the present invention, the inventors have found that the technology has at least the following problems: Because the width of the needle driving groove is relatively wide, when the knitting needle moves in the needle driving groove, the stroke of the knitting needle increases due to the inertia of the up and down movement, and the density of the knitted loops decreases. Summary of the Invention [Problem to be solved by the invention]
[0005] The present invention provides a cam and cam structure for large circular knitting machines to improve knitted loop density. [Means for solving the problem]
[0006] In a first aspect, the cam provided by the present invention uses the following technical solution. A cam including a cam body, the cam body having a needle insertion groove, a needle operating groove and a needle exit groove formed in this order, the needle operating groove communicating with the needle insertion groove and the needle exit groove, the width of the needle operating groove being 3.1 mm to 3.3 mm.
[0007] With the above technical solution, the knitting needle enters the needle operating groove from the needle insertion groove, then moves from the needle operating groove to the needle exit groove, and finally moves from the needle exit groove to exit the cam body, knitting the yarn into a loop as the knitting needle moves in the needle operating groove, the knitting needle moves in the needle operating groove with a width of 3.1mm to 3.3mm, and the increased stroke of the knitting needle due to the inertia of the up and down movement can be reduced, thereby improving the density of the knitted loops, and the density increases by 5 to 10 meshes per inch.
[0008] Optionally, the needle operating groove includes an ascending groove, a descending groove, a threading groove and a knitting groove which are opened in sequence on the cam body, one end of the ascending groove remote from the descending groove is connected to the needle insertion groove, a first circular arc is formed at a point where the needle insertion groove is connected to the ascending groove, a second circular arc is formed at a point where the ascending groove is connected to the descending groove, a cross section of the threading groove is arc-shaped, one end of the knitting groove remote from the threading groove is connected to the needle outlet groove, and a third circular arc is formed at a point where the knitting groove is connected to the needle outlet groove.
[0009] By using the above technical solution, the knitting needle enters the upward groove from the needle insertion groove, then passes through the downward groove, then enters the yarn hooking groove, then enters the knitting groove, and finally moves out of the needle exit groove and exits the cam body. The first, second and third arcs formed allow the knitting needle to move stably when the knitting needle moves, and can reduce damage to the knitting needle.
[0010] Optionally, the included angle between the descending groove and the ascending groove is between 59° and 61°.
[0011] With the above technical solution, the included angle between the ascending groove and the descending groove can make the needle move stably, and protect the needle, while later the needle can easily knit the yarn into a loop.
[0012] Optionally, two guide blocks are provided on the cam body, and the two guide blocks form a guide hole communicating with the needle ejection groove.
[0013] With the above technical solution, the needle moves more reliably from the needle exit groove of the cam to the needle entry groove of the adjacent cam due to the guide hole formed by the two guide blocks.
[0014] Optionally, the cam body includes a first half, a second half, a connecting body, and a first connecting bolt, the first half is connected to the connecting body by the first connecting bolt, and the second half is also connected to the connecting body by the first connecting bolt, and the first half and the second half form the needle insertion groove, the needle operation groove, and the needle exit groove in the connecting body.
[0015] With the above technical solution, when the first half or the second half is damaged, the needle operating groove formed in the connecting body by the first half and the second half will be deformed, the movement path of the knitting needle will change, and problems will occur in the knitted loop. Therefore, when the first half or the second half is damaged, the first connecting bolt is rotated to separate the first connecting bolt from the connecting body, and then the damaged first half or second half is replaced, so as to ensure the quality of the knitted loop, and also to realize the saving of resources by replacing only the damaged part.
[0016] Optionally, the connecting body includes a third half, a fourth half, and a second connecting bolt, a first screw hole is provided in the third half, a second screw hole is provided in the fourth half, the second connecting bolt passes through the second screw hole on the fourth half and is screwed into the first screw hole on the third half, and the second screw hole is also screwed into the second connecting bolt, and the first half is connected to the third half by the first connecting bolt, and the second half is connected to the fourth half by the first connecting bolt.
[0017] With the above technical solution, firstly, the first half is connected to the third half by the first connecting bolt, and the second half is connected to the fourth half by the first connecting bolt. If the width of the needle operating groove formed by the first half located on the third half and the second half located on the fourth half is not within 3.1mm-3.3mm, the distance between the third half and the fourth half can be adjusted as required to make the width of the needle operating groove 3.1mm-3.3mm. After the position of the third half relative to the fourth half is determined, the second connecting bolt is passed through the second screw hole on the fourth half and screwed into the first screw hole on the third half, and the second screw hole on the fourth half is also screwed into the second connecting bolt, thereby realizing the connection between the third half and the fourth half. Therefore, even if an adjustable connector is provided, the normal use of the cam can be guaranteed.
[0018] In a second aspect, the cam structure of a large-scale circular knitting machine provided by the present invention uses the following technical solution. A cam structure for a large circular knitting machine, comprising a saddle body, a plurality of sets of connection assemblies, and an adjustment assembly, wherein the connection assembly comprises two adjustment blocks and a plurality of third connection bolts, both of which are slidably mounted on the saddle body, the third half is connected to one of the adjustment blocks by one of the third connection bolts, and the fourth half is connected to the other of the adjustment blocks by one of the third connection bolts, the adjustment assembly is mounted on the saddle body, and the adjustment blocks in the plurality of sets of connection assemblies are all connected to the adjustment assembly.
[0019] With the above technical solution, firstly, the third half and the fourth half connected by the second connecting bolt are respectively connected to the two adjusting blocks by the third connecting bolt; when it is necessary to adjust the distance between the third half and the fourth half, that is, when it is necessary to adjust the width of the needle movement groove, firstly, the second connecting bolt is separated from the second screw hole on the fourth half; then, the position of the two adjusting blocks in the connecting assembly is adjusted by the adjusting assembly; then, the two adjusting blocks change the positions of the third half and the fourth half; and when the positions of the third half and the fourth half are determined, The second connecting bolt is screwed into the second screw hole on the fourth half, and when the saddle needs to be attached to a large circular knitting machine, the distance between the third half and the fourth half can be first increased so that neither the first half nor the second half is fully abutted against the knitting needle, and then the position of the third half and the fourth half is adjusted by the adjustment assembly to reduce the width of the needle operating groove formed between the first half and the second half, so that the knitting needle is more reliably positioned in the needle operating groove and the knitting needle is quickly adapted to the needle operating groove of the cam located on the saddle body, thereby shortening the adjustment time and improving efficiency.
[0020] Optionally, the adjustment assembly includes an adjustment shaft and a bidirectional screw, the adjustment shaft is rotatably mounted on the saddle body, the bidirectional screws are provided in plurality, and the plurality of bidirectional screws are all mounted on the adjustment shaft, the bidirectional screw and the connection assembly have a one-to-one correspondence, the bidirectional screw passes through two of the adjustment blocks, and the two adjustment blocks in the connection assemblies of the same set are respectively screw-connected to both ends of the same bidirectional screw.
[0021] By using the above technical solution, when the adjustment shaft is rotated, the adjustment shaft rotates together with the bidirectional screw, and the bidirectional screw takes the two adjustment blocks to move oppositely or back to back, and the adjustment assembly provided has a simple structure and is easy to operate.
[0022] As can be seen from the above, the present invention includes at least one of the following beneficial technical effects. 1. The knitting needle moves within a needle groove with a width of 3.1 mm to 3.3 mm, and the increasing stroke of the knitting needle due to the inertia of the up and down movement can be reduced, thereby improving the density of the knitted loops, and the density increases by 5 to 10 meshes per inch. 2. The provided cam structure can quickly match the knitting needle with the needle groove of the cam located on the saddle body, shortening the adjustment time and improving efficiency. [Brief description of the drawings]
[0023] [Figure 1] FIG. 1 is a schematic diagram showing the structure of a cam according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a structural schematic diagram of a connector according to an embodiment of the present invention. [Diagram 3] FIG. 3 is a structural schematic diagram of a cam structure of a large circular knitting machine according to an embodiment of the present invention. [Figure 4] FIG. 4 is a structural schematic diagram of an adjustment assembly according to an embodiment of the present invention.
[0024] Explanation of symbols: 1...cam body, 11...needle insertion groove, 12...needle operation groove, 121...ascending groove, 122...descending groove, 123...yarn hooking groove, 124...knit groove, 13...needle exit groove, 2...guide block, 21...guide hole, 3...first half, 4...second half, 5...connecting body, 51...third half, 52...fourth half, 53...second connecting bolt, 6...first connecting bolt, 71...saddle body, 72...connecting assembly, 721...adjusting block, 722...third connecting bolt, 73...adjusting assembly, 731...adjusting shaft, 732...bidirectional screw. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0025] The present invention will now be described in more detail with reference to FIGS.
[0026] The embodiments of the present invention disclose a cam and a cam structure for a large circular knitting machine.
[0027] Referring to FIG. 1, the cam includes a cam body 1, which includes a connecting body 5 having a first half 3 provided at one end of the connecting body 5 and a second half 4 provided at the other end of the connecting body 5.
[0028] Referring to Figure 2, the connecting body 5 includes a third half 51, a first screw hole is provided in the third half 51, a fourth half 52 is provided on one side of the third half 51, a second screw hole is provided in the fourth half 52, and a second connecting bolt 53 is provided in the fourth half 52, which passes through the second screw hole on the fourth half 52 and is screwed into the first screw hole on the third half 51, and the second connecting bolt 53 is also screwed into the second screw hole on the fourth half 52.
[0029] The first half 3 abuts against the third half 51, and the first half 3 is provided with a first connecting bolt 6 that passes through the first half 3 and is screwed to the third half 51, and the second half 4 abuts against the fourth half 52, and the second half 4 is provided with a first connecting bolt 6 that passes through the second half 4 and is screwed to the fourth half 52.
[0030] 1, between the first half 3 connected to the third half 51 and the second half 4 connected to the fourth half 52, a needle insertion groove 11, a needle operation groove 12 and a needle exit groove 13 are formed in this order along the movement direction of the knitting needle. The needle operation groove 12 includes an ascending groove 121, a descending groove 122, a thread hooking groove 123 and a knit groove 124 in this order along the movement direction of the knitting needle. One end of the ascending groove 121 communicates with the needle insertion groove 11, and a first circular arc is formed at the point where the needle insertion groove 11 communicates with the ascending groove 121, one end of the ascending groove 121 away from the needle insertion groove 11 communicates with the descending groove 122, and a second circular arc is formed at the point where the ascending groove 121 communicates with the descending groove 122, and the included angle between the ascending groove 121 and the descending groove 122 is 59° to 61°, and in this embodiment, it is 60°. It is preferable that one end of the descending groove 122 remote from the ascending groove 121 communicates with the thread hooking groove 123, the cross section of the thread hooking groove 123 is arc-shaped, one end of the thread hooking groove 123 remote from the descending groove 122 communicates with the knitting groove 124, one end of the knitting groove 124 remote from the thread hooking groove 123 communicates with the needle outlet groove 13, and a third arc is formed at the point where the knitting groove 124 communicates with the needle outlet groove 13.
[0031] The width of the needle operating groove 12 is 3.1 mm to 3.3 mm, and in this embodiment, it is preferably 3.25 mm. That is, the widths of the ascending groove 121, the descending groove 122, the threading groove 123 and the knitting groove 124 are all 3.25 mm.
[0032] Referring to Figure 2, one guide block 2 is fixedly connected to one end of the first half 3 close to the needle ejection groove 13 and one end of the second half 4 close to the needle ejection groove 13, and the guide block 2 on the first half 3 and the guide block 2 on the second half 4 form a guide hole 21, and the guide hole 21 is connected to the needle ejection groove 13.
[0033] The knitting needle moves from the needle insertion groove 11 into the upward groove 121, then passes through the downward groove 122, then into the yarn hooking groove 123, and further into the knit groove 124, then moves from the needle exit groove 13 into the guide hole 21, and finally moves from the guide hole 21 to exit the cam body 1.
[0034] The implementation principle of the cam of the embodiment of the present invention is as follows: the first half 3 is connected to the third half 51 by the first connecting bolt 6 , and the second half 4 is connected to the fourth half 52 by the first connecting bolt 6 .
[0035] Next, the positions of the third half 51 and the fourth half 52 are adjusted to set the width of the needle operation groove 12 formed by the first half 3 and the second half 4 to 3.25 mm. Finally, the second connecting bolt 53 is passed through the second screw hole on the fourth half 52 and screwed into the first screw hole on the third half 51, and the second connecting bolt 53 is also screwed into the second screw hole on the fourth half 52.
[0036] An embodiment of the present invention also discloses a cam structure for a large circular knitting machine.
[0037] 3 and 4, the cam structure of a large circular knitting machine includes a saddle body 71, in which a slide groove is formed, and four sets of connection assemblies 72 are provided on the saddle body 71, and one cam body 1 is connected to the connection assembly 72 of each set, and each set of connection assemblies 72 includes two adjustment blocks 721 that slide and connect within the slide groove, and the third half 51 in the cam body 1 abuts against one of the adjustment blocks 721, and the third half 51 is provided with a third connection bolt 722 that passes through the third half 51 and is screwed to the adjustment block 721, and the fourth half 52 in the cam body 1 abuts against the other adjustment block 721, and the fourth half 52 is also provided with a third connection bolt 722 that passes through the fourth half 52 and is screwed to the adjustment block 721.
[0038] 3 and 4, the saddle body 71 is provided with an adjustment assembly 73, which includes an adjustment shaft 731 that rotates in a slide groove, and four bidirectional screws 732 are provided on the adjustment shaft 731. The four bidirectional screws 732 correspond one-to-one to the four sets of connection assemblies 72, and the two adjustment blocks 721 in each set of connection assemblies 72 are respectively screw-connected to both ends of the bidirectional screws 732.
[0039] The implementation principle of the cam structure of the large-scale circular knitting machine in the embodiment of the present invention is as follows: First, the third half 51 and the fourth half 52 connected by the second connecting bolt 53 are respectively connected to the two adjustment blocks 721 of the same set of connection assembly 72 by the third connecting bolt 722; when the distance between the third half 51 and the fourth half 52 needs to be adjusted, that is, when the width of the needle driving groove 12 needs to be adjusted, the second connecting bolt 53 is first separated from the first screw hole on the third half 51; then, the adjustment shaft 731 is rotated, and the adjustment shaft 731 rotates together with the bidirectional screw 732, which moves the two adjustment blocks 721 oppositely or back-to-back, so that the distance between the third half 51 and the fourth half 52 on the two adjustment blocks 721 changes; when the positions of the third half 51 and the fourth half 52 are fixed, the second connecting bolt 53 is screwed into the first screw hole on the third half 51.
[0040] The above are preferred embodiments of the present invention, and do not limit the scope of protection of the present invention. Therefore, any equivalent changes in the structure, shape, and principle of the present invention are also included in the scope of protection of the present invention.
Claims
1. In a cam including a cam body (1), The cam body (1) is provided with a needle insertion groove (11), a needle operation groove (12) and a needle exit groove (13) in this order, the needle operation groove (12) is connected to the needle insertion groove (11) and the needle exit groove (13), and the width of the needle operation groove (12) is 3.1 mm to 3.3 mm.
2. The needle operating groove (12) includes an ascending groove (121), a descending groove (122), a thread hooking groove (123) and a knitting groove (124) which are sequentially opened on the cam body (1), One end of the upward groove (121) remote from the downward groove (122) communicates with the needle insertion groove (11), and a first circular arc is formed at the point where the needle insertion groove (11) communicates with the upward groove (121); A second circular arc is formed at a point where the ascending groove (121) is connected to the descending groove (122); The cross section of the thread hook groove (123) is arc-shaped, The cam described in claim 1, characterized in that one end of the knitting groove (124) remote from the thread hooking groove (123) is connected to the needle outlet groove (13), and a third arc is formed at the point where the knitting groove (124) is connected to the needle outlet groove (13).
3. The cam according to claim 2, characterized in that the included angle between the descending groove (122) and the ascending groove (121) is between 59° and 61°.
4. The cam according to claim 1, characterized in that two guide blocks (2) are provided on the cam body (1), and the two guide blocks (2) form guide holes (21) communicating with the needle ejection groove (13).
5. The cam body (1) includes a first half (3), a second half (4), a connecting body (5), and a first connecting bolt (6), The cam described in claim 1, characterized in that the first half (3) is connected to the connecting body (5) by the first connecting bolt (6), the second half (4) is also connected to the connecting body (5) by the first connecting bolt (6), and the first half (3) and the second half (4) form the needle insertion groove (11), the needle operation groove (12) and the needle exit groove (13) in the connecting body (5).
6. The connector (5) includes a third half (51), a fourth half (52), and a second connector bolt (53), A first screw hole is provided in the third half (51), a second screw hole is provided in the fourth half (52), the second connection bolt (53) passes through the second screw hole on the fourth half (52) and is screwed into the first screw hole on the third half (51), and the second screw hole is also screwed into the second connection bolt (53); A cam according to claim 5, characterized in that the first half (3) is connected to the third half (51) by the first connecting bolt (6) and the second half (4) is connected to the fourth half (52) by the first connecting bolt (6).
7. The saddle includes a saddle body (71), a plurality of sets of connection assemblies (72), and an adjustment assembly (73); The connection assembly (72) includes two adjustment blocks (721) and a plurality of third connection bolts (722), and the two adjustment blocks (721) are both slidably mounted on the saddle body (71), the third half (51) is connected to one of the adjustment blocks (721) by one of the third connection bolts (722), and the fourth half (52) is connected to the other adjustment block (721) by one of the third connection bolts (722), The cam structure of a large circular knitting machine including a cam as described in claim 6, characterized in that the adjustment assembly (73) is provided on the saddle body (71), and the adjustment blocks (721) in the multiple sets of connection assemblies (72) are all connected to the adjustment assembly (73).
8. The adjustment assembly (73) includes an adjustment shaft (731) and a bidirectional screw (732); The adjustment shaft (731) is provided to rotate in the saddle body (71), The cam structure of a large-scale circular knitting machine according to claim 7, characterized in that a plurality of the bidirectional screws (732) are provided, the plurality of bidirectional screws (732) are all provided on the adjustment shaft (731), the bidirectional screws (732) and the connection assemblies (72) correspond one-to-one, the bidirectional screws (732) pass through two of the adjustment blocks (721), and the two adjustment blocks (721) in the same set of the connection assemblies (72) are respectively screw-connected to both ends of the same bidirectional screw (732).