Needle plate expanding structure of flat knitting machine

Abstract

The invention relates to a flat knitting machine needle plate expanding structure which comprises a plate body, the plate body comprises a front plate and a rear plate, the front plate and the rear plate are mutually fixed through a connecting rod to form a needle plate structure with a triangular section, expanding plates are detachably arranged at the two ends of the plate body in the length direction, and disassembling and assembling assemblies are arranged between the expanding plates and the plate body. The expansion plate is detachably installed on the plate body through the dismounting assembly, the dismounting assembly comprises an insertion block, an insertion groove, a fixing block and a fixing groove, the insertion block is arranged at one end of the plate body in the length direction in a sliding mode, the insertion groove is formed in one end of the expansion plate in the width direction, the insertion block is inserted into the insertion groove in a sliding mode, and the fixing block is arranged on the side wall of the insertion block in a sliding mode. The fixing grooves are formed in the side walls of the inserting grooves, and the inserting blocks are inserted into the inserting grooves or contained in the fixing blocks in a sliding mode. The knitting needle type yarn cutting structure has the effect that the knitting needle type yarn cutting structure can be used under the condition that the needle plate is full of needles.

Description

Technical Field

[0001] The present application relates to the field of computerized flat knitting machines, and in particular to a needle plate expansion structure of a flat knitting machine. Background Art

[0002] A computerized flat knitting machine is a double-needle plate latch needle weft knitting machine. Its cam mechanism acts like a set of flat cams. The needle's foot enters the cam's groove, moving the cam, forcing the needle to rise and fall rhythmically within the needle slot of the needle plate. Through the action of the needle hook and latch, the yarn is woven into a knitted fabric. As the needle rises, the yarn loop gradually exits the hook, opening the latch and withdrawing it to hang on the needle bar. As the needle descends, the hook grabs the newly placed yarn and bends it into a loop, while the existing loop escapes the hook. The new loop passes through the old loop, connecting in series. Numerous loops formed by knitting are interconnected to form a knitted fabric.

[0003] The existing computerized flat knitting machine is provided with yarn shears at both ends of the needle plate, which cut the yarn after the knitted fabric is knitted, thereby separating the yarns of the two pieces of knitted fabric. The existing yarn shears are complex in structure and high in cost. Installing them on the needle plate easily affects the operation of the yarn mouth. Therefore, our company has developed a knitting needle type yarn shearing structure. By installing a hook with a cutter in the needle plate, the triangular device on the machine head drives the hook with the cutter to slide to hook and cut the yarn when yarn shearing is required. However, when the needle plate is full of needles, there is no needle groove to place the yarn shearing structure, which makes the knitting needle type yarn shearing structure unable to be used when the needle plate is full of needles. Summary of the Invention

[0004] In order to enable the knitting needle type yarn cutting structure to be used when the needle plate is full of needles, the present application provides a flat knitting machine needle plate expansion structure.

[0005] The present application provides a flat knitting machine needle plate expansion structure adopting the following technical solutions:

[0006] A flat knitting machine needle plate expansion structure includes a plate body, the plate body includes a front plate and a rear plate, the front plate and the rear plate are fixed to each other by a connecting rod to form a needle plate structure with a triangular cross-section, expansion plates are detachably provided at both ends of the plate body in the length direction, a disassembly and assembly component is provided between the expansion plate and the plate body, the expansion plate can be detachably installed on the plate body through the disassembly and assembly component, the disassembly and assembly component includes an insert block, a slot, a fixed block and a fixed slot, the insert block is slidably provided at one end in the length direction of the plate body, the slot is opened at one end in the width direction of the expansion plate, the insert block is inserted into the slot by sliding, the fixed block is slidably provided on the side wall of the insert block, the fixed slot is opened on the side wall of the slot, the insert block is inserted into the slot by sliding or is received in the fixed block.

[0007] By adopting the above technical solution, the needle plate is expanded by adding an expansion plate on the plate body, thereby providing installation space for the knitting needle type yarn shearing structure, so that the knitting needle type yarn shearing structure can be used when the needle plate is full of needles.

[0008] Optionally, a driving mechanism is provided between the fixed block and the insertion block, and the driving mechanism includes a sliding rod, an abutment block and a wedge surface. The sliding rod is slidingly arranged at the end of the insertion block away from the plate body, and the abutment block is fixed on the sliding rod. The wedge surface is opened at the end of the fixed block inserted into the insertion block, and the abutment block abuts against the wedge surface. The sliding rod slides toward the insertion block to drive the abutment block to slide, and the abutment block abuts the wedge surface to drive the fixed block to slide out of the insertion block. An elastic piece is provided between the fixed block and the insertion block, and the elastic piece drives the fixed block to slide and be stored in the insertion block.

[0009] By adopting the above technical solution, the setting of the driving mechanism can make the fixing block extend out of the plug-in block after the plug-in block is inserted into the slot, thereby fixing the expansion board. At the same time, it also reduces the probability of the fixing block sliding out of the plug-in block before the plug-in block is inserted into the slot, affecting the insertion of the plug-in block into the slot.

[0010] Optionally, an insertion hole is provided at the bottom of the slot, and a push rod is slidably inserted into the insertion hole. The push rod slides flush with the bottom of the slot or is received in the insertion hole. The insertion hole is adapted to the sliding rod. When the push rod is received in the insertion hole, the sliding rod is slidably inserted in the insertion hole.

[0011] By adopting the above technical solution, the insertion hole cooperates with the ejector rod to provide the sliding space for the sliding rod when the expansion plate needs to be disassembled, so that the fixed block can be reset and stored in the insertion block.

[0012] Optionally, a return spring is provided between the insert block and the plate body, and the return spring drives the insert block to slide and be accommodated in the plate body.

[0013] By adopting the above technical solution, the setting of the return spring can make the plug-in block accommodated in the plate body under normal conditions, reducing the probability of the plug-in block or the fixing block on the plug-in block being damaged by external force impact.

[0014] Optionally, a driving rod is rotatably provided on the plate body, one end of the driving rod abuts against one end of the insert block inserted into the plate body, and the other end of the driving rod extends out of one end of the plate body in the length direction.

[0015] By adopting the above technical solution, the setting of the driving rod can make the insert block slide out of the plate body by abutting the driving rod when the expansion plate is installed, thereby facilitating the installation of the expansion plate. The driving rod can also provide a thrust to move the expansion plate away from the plate body when the expansion plate is disassembled, thereby preventing the expansion part from adhering to the plate body and facilitating the disassembly of the expansion plate.

[0016] Optionally, an insert block is slidably provided on one end of the expansion board away from the board body in the width direction.

[0017] By adopting the above technical solution, an insert block is provided on the side of the expansion board away from the board body in the width direction, so that the expansion board can continue to be installed on the expansion board for expansion.

[0018] Optionally, the connecting rod is slidably arranged on the needle plate, and a fixing bolt is installed on the connecting rod, and the fixing bolt fixes the connecting rod.

[0019] By adopting the above technical solution, the sliding setting of the connecting rod can adjust the position of the connecting rod after the expansion plate is installed, so that it can be used to install ordinary knitting needles in the expansion class for the expansion of knitting needles.

[0020] Optionally, the connecting rod includes a sliding portion, a connecting portion and an abutting portion, the sliding portion is slidably arranged on the needle plate, the connecting portion is fixed on the sliding portion, the connecting portion extends toward one end in the length direction of the plate body, the abutting portion is fixed on the connecting portion, and the abutting portion abuts against the opposite side of the front plate and the rear plate.

[0021] By adopting the above technical solution, when the abutting portion abuts against the expansion plate through the connecting portion, the sliding portion can still be slidably arranged on the plate body, which facilitates the fixing of the connecting rod on the plate body.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. By adding an expansion plate to the plate body to expand the needle plate, it is possible to provide installation space for the knitting needle type yarn shearing structure, so that the knitting needle type yarn shearing structure can be used when the needle plate is full of needles;

[0024] 2. The drive mechanism allows the fixing block to extend out of the insert after the insert is inserted into the slot, thereby securing the expansion board. This also reduces the probability of the fixing block slipping out of the insert before the insert is inserted into the slot, thereby affecting the insertion of the insert.

[0025] 3. The insertion hole and the ejector rod provide space for the sliding rod to slide when the expansion board needs to be removed, so that the fixed block can be reset and stored in the insertion block;

[0026] 4. The reset spring allows the insert to be normally stored within the board, reducing the probability of damage to the insert or its mounting block due to external impact. The drive rod allows the insert to slide out of the board when the expansion board is installed by abutting the drive rod, thereby facilitating installation of the expansion board. The drive rod also provides a thrust to push the expansion board away from the board during removal, preventing the expansion portion from adhering to the board and facilitating removal of the expansion board.

[0027] 5. An insert is set on the side of the expansion board away from the board body in the width direction, so that the expansion board can be further installed for expansion;

[0028] 6. The sliding setting of the connecting rod can adjust the position of the connecting rod after the expansion plate is installed, so that it can be used to install ordinary knitting needles in the expansion class for the expansion of knitting needles. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural diagram of a knitting needle type yarn shearing structure.

[0030] Figure 2 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0031] Figure 3 yes Figure 2 Magnified view of part A in the middle.

[0032] Explanation of the accompanying drawings: 1. Plate body; 101. Front plate; 102. Rear plate; 2. Connecting rod; 21. Sliding portion; 22. Connecting portion; 23. Abutting portion; 3. Expansion plate; 4. Disassembly and assembly component; 41. Insert block; 42. Slot; 43. Fixed block; 44. Fixed slot; 5. Driving mechanism; 51. Sliding rod; 52. Abutting block; 53. Wedge surface; 6. Elastic member; 7. Insert hole; 8. Push rod; 9. Return spring; 10. Driving rod; 11. Fixing bolt; 12. Push rod; 13. Needle groove; 14. Hook knife; 15. Fixed knife; 16. Wire pressing spring; 17. Hook groove; 18. Cutting opening. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-3 This application is described in further detail.

[0034] First of all, it should be noted that in the description of this application, if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and other directional words appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of this application; in addition, if the terms "first", "second", "third" and other numerical quantifiers appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", and "connected" appear, they should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an interference fit, a transition fit and other limited connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium; therefore, for ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0035] The knitting needle type yarn cutting structure mentioned in the background technology of this application is referred to as Figure 1 , including a hook knife 14, a fixed knife 15 and a wire pressing spring 16, the hook knife 14 is slidably arranged in one of the needle grooves 13, the fixed knife 15 and the wire pressing spring 16 are respectively fixedly mounted on the plate body 1 or the expansion plate 3 on both sides in the width direction of the hook knife 14, and the fixed knife 15 and the wire pressing spring 16 are respectively abutted on both sides in the width direction of the hook knife 14, and the fixed knife 15 is located on the side of the hook knife 14 facing the center direction of the plate body 1, and a hook groove 17 is provided on the hook knife 14, and a cutting opening 18 is provided on the hook groove 17 facing the side of the fixed knife 15. The flat knitting machine head cam runs to the hook knife 14 to drive the hook knife 14 to start needle hooking yarn. When the hook knife 14 closes the needle, the yarn to be cut is pulled to the fixed knife 15 and the wire pressing spring 16. After the yarn is clamped and fixed by the wire pressing spring 16, the yarn is clamped and cut by the hook knife 14 and the fixed knife 15 to achieve yarn shearing.

[0036] The present application discloses a needle plate expansion structure for a flat knitting machine, referring to Figure 2 and Figure 3 , including a plate body 1, the plate body 1 includes a front plate 101 and a back plate 102, the front plate 101 and the back plate 102 are fixed to each other by a connecting rod 2 to form a needle plate structure with a triangular cross-section, the two ends of the connecting rod 2 in the length direction are abutted against the front plate 101 and the back plate 102 facing each other, there are several connecting rods 2, respectively arranged at the two ends near the length direction of the plate body 1, the middle area of ​​the connecting rods 2 at the two ends of the length is the knitted fabric cutting area, so the connecting rod 2 needs to be arranged near the two ends of the length direction of the plate body 1 to avoid affecting the normal cutting of the knitted fabric, the front plate 101 and the back plate 102 are opposite to each other and are evenly provided with a plurality of needle grooves 13 along their length direction, and the two ends of the length direction of the plate body 1 are detachable and provided with an expansion plate 3, the expansion plate 3 is a rectangular plate body 1, and the expansion plate 3 is evenly provided with a plurality of needle grooves 13 along its width direction on one side in the thickness direction. A disassembly assembly 4 is provided between the expansion plate 3 and the plate body 1, and the expansion plate 3 can be detachably installed on the plate body 1 through the disassembly assembly 4. Two groups of disassembly and assembly components 4 are provided, and the two groups of disassembly and assembly components 4 are respectively provided at both ends of the length direction of the expansion board 3. The disassembly and assembly components 4 include an insert block 41 slidably provided at one end of the length direction of the plate body 1, a slot 42 provided at one end of the width direction of the expansion board 3, a fixed block 43 slidably provided on the side wall of the insert block 41, and a fixed groove 44 provided on the side wall of the slot 42. The insert block 41 is inserted into the slot 42 by sliding. In this embodiment, two fixed blocks 43 are provided, and the two fixed blocks 43 are respectively provided on the insert block 41. On both sides, two fixing slots 44 are provided corresponding to the fixing blocks 43, and the insert block 41 is inserted into the slot 42 by sliding or is received in the fixing block 43. When the insert block 41 is fully inserted into the fixing slot 44, the fixing slot 44 and the fixing block 43 are aligned with each other. At this time, the fixing block 43 can be inserted into the fixing slot 44 by sliding. By adding the expansion plate 3 to the plate body 1 to expand the needle plate, installation space is provided for the knitting needle type yarn shearing structure, so that the knitting needle type yarn shearing structure can be used when the needle plate is full of needles.

[0037] Reference Figure 2 and Figure 3 A driving mechanism 5 is provided between the fixed block 43 and the insertion block 41. The driving mechanism 5 includes a sliding rod 51 that is slidably provided at one end of the insertion block 41 away from the plate body 1, an abutting block 52 fixed on the sliding rod 51, and a wedge-shaped surface 53 provided at one end of the fixed block 43 that is inserted into the insertion block 41. In this embodiment, the fixed block 43 is provided with two abutting blocks 52 corresponding to two fixed blocks 43. The two abutting blocks 52 respectively abut against the wedge-shaped surfaces 53 of the two fixed blocks 43. The sliding rod 51 slides toward the insertion block 41 to drive the abutting block 52 to slide. The abutting block 52 abuts against the wedge surface 53 to drive the fixed block 43 to slide out of the insertion block 41. When the insert block 41 is fully inserted into the slot 42, the sliding rod 51 abuts against the bottom of the slot 42 and slides into the insert block 41 through the abutment of the bottom of the slot 42. Then, the sliding rod 51 drives the abutment block 52 to slide, and the abutment block 52 drives the fixed block 43 to slide out of the insert block 41, so that the fixed block 43 is inserted into the fixed groove 44. An elastic member 6 is provided between the fixed block 43 and the insert block 41. In this embodiment, the elastic member 6 is a spring. The elastic member 6 drives the fixed block 43 to slide and be accommodated in the insert block 41 through elastic force. The setting of the driving mechanism 5 can make the fixed block 43 extend out of the insert block 41 after the insert block 41 is inserted into the slot 42, thereby The expansion board 3 is fixed, and the probability of the fixed block 43 sliding to the outside of the plug-in block 41 before the plug-in block 41 is inserted into the slot 42 is reduced, which affects the insertion of the plug-in block 41 into the slot 42. The slot 42 is provided with an insertion hole 7 at the bottom, and a push rod 8 is slidably inserted into the insertion hole 7. The push rod 8 is flush with the bottom of the slot 42 or is received in the insertion hole 7 by sliding. The insertion hole 7 is adapted to the sliding rod 51. When the push rod 8 is received in the insertion hole 7, the elastic member 6 drives the fixed block 43 to be received in the plug-in block 41. The fixed block 43 drives the sliding rod 51 to be slidably inserted into the insertion hole 7 through the abutment rod. At this time, the plug-in block 41 can be removed from the slot 42. The insertion hole 7 cooperates with the push rod 8 to provide sliding space for the sliding rod 51 when the expansion plate 3 needs to be disassembled, so that the fixed block 43 can be reset and stored in the insertion block 41; in this embodiment, two sets of disassembly and assembly components 4 are provided, so there are even two push rods 8 on the expansion plate 3. In this embodiment, the two push rods 8 are connected by a shift rod 12, and the shift rod 12 is slidingly set on the expansion plate 3. A spring is set between the shift rod 12 and the expansion plate 3. The spring elastic force makes the shift rod 12 drive the push rod 8 to be flush with the bottom of the slot 42 under normal conditions. A bolt is threaded on the shift rod 12, and tightening the bolt can fix the shift rod 12 on the expansion plate 3.

[0038] Reference Figure 2 and Figure 3A return spring 9 is provided between the plug block 41 and the plate body 1. The return spring 9 drives the plug block 41 to slide and be received in the plate body 1 through elastic force. The setting of the return spring 9 can make the plug block 41 be received in the plate body 1 under normal conditions, reducing the probability of external force impact causing the plug block 41 or the fixed block 43 on the plug block 41 to be damaged by force; a driving rod 10 is rotatably provided on the plate body 1, one end of the driving rod 10 abuts against the end of the plug block 41 inserted into the plate body 1, and the other end of the driving rod 10 extends out of one end in the length direction of the plate body 1. The setting of the driving rod 10 can make the plug block 41 slide out of the plate body 1 by abutting the driving rod 10 when the expansion plate 3 is installed, thereby facilitating the installation of the expansion plate 3. At the same time, the driving rod 10 can also provide a thrust to make the expansion plate 3 away from the plate body 1 when the expansion plate 3 is disassembled, thereby avoiding the expansion part from adhering to the plate body 1, facilitating the disassembly of the expansion plate 3.

[0039] Reference Figure 2 and Figure 3 The expansion board 3 is slidably provided with an insert block 41 at one end away from the board body 1 in the width direction, and a structure for connecting the expansion board 3 is provided on the board body 1. The insert block 41 is provided on the side of the expansion board 3 away from the board body 1 in the width direction, so that the expansion board 3 can continue to be installed on the expansion board 3 for expansion.

[0040] Reference Figure 2 and Figure 3 The connecting rod 2 is slidably arranged on the plate body 1, and the connecting rod 2 includes a sliding portion 21 slidably arranged on the plate body 1, a connecting portion 22 fixed on the sliding portion 21 and an abutting portion 23 fixed on the connecting portion 22. The sliding portion 21 is slidably arranged in an area near the center position of the main body, and the connecting portion 22 extends toward one end in the length direction of the plate body 1, and the abutting portion 23 abuts against the side facing the front plate 101 and the rear plate 102. A fixing bolt 11 is installed on the connecting portion 22 of the connecting rod 2, and the fixing bolt 11 fixes the connecting rod 2; under normal circumstances, the abutting portion 23 of the connecting rod 2 abuts near the end in the length direction of the plate body 1, and the sliding portion 21 is arranged near the center of the plate body 1. When the expansion plate 3 is installed and the expansion plate 3 is used to place knitting needles, the fixing bolt 11 is loosened, the abutting portion 23 is driven to slide to the end of the expansion plate 3 away from the plate body 1, and then the fixing bolt 11 is tightened to fix the connecting rod 2, so that the connecting rod 2 can be outside the knitting area, thereby reducing the influence of the connecting rod 2 on the knitted fabric blanking.

[0041] The implementation principle of the embodiment of the present application is as follows: when the knitting needle type yarn cutting structure needs to be installed or more needles need to be added under the condition of full needles, the expansion plate 3 is abutted against the plate body 1, and the expansion plate 3 is abutted against the driving rod 10, so that the driving rod 10 rotates, and the driving rod 10 drives the plug 41 to slide and insert into the slot 42 of the expansion plate 3. When the plug 41 is fully inserted into the slot 42, the sliding rod 51 abuts against the bottom of the slot 42 and slides into the plug 41, and drives the fixing block 43 to slide and insert into the fixing slot 44 to complete the installation and fixation of the expansion plate 3; when it is needed When removing the expansion plate 3, the driving block slides away from the plate body 1, the top rod 8 slides to open the insertion hole 7, the sliding rod 51 loses its abutment, and the fixed block 43 is disengaged from the fixed groove 44 under the elastic force of the elastic member 6 and is received in the insertion block 41. The insertion block 41 abuts against the driving rod 10 under the elastic force of the reset spring 9 to rotate the driving rod 10. The driving rod 10 applies a force to the expansion plate 3 to slide away from the plate body 1, remove the expansion plate 3, and complete the disassembly of the expansion plate 3. At this time, the insertion block 41 resets and slides to be received in the slot 42 to complete the reset.

[0042] It should be noted that the above embodiments are only used to illustrate the present application and are not intended to limit the technical solutions described in the present application. Although this specification has described the present application in detail with reference to the above embodiments, ordinary technicians in this field should understand that technicians in the relevant technical field can still modify or replace the present application with equivalents, and all technical solutions and improvements that do not depart from the spirit and scope of the present application should be included in the scope of the claims of the present application.

Claims

1. A needle plate expansion structure for a flat knitting machine, comprising a plate body (1), wherein the plate body (1) comprises a front plate (101) and a rear plate (102), wherein the front plate (101) and the rear plate (102) are fixed to each other via a connecting rod (2) to form a needle plate structure having a triangular cross section, characterized in that: The plate body (1) is detachably provided with expansion plates (3) at both ends in the length direction. A disassembly assembly (4) is provided between the expansion plate (3) and the plate body (1). The expansion plate (3) is detachably installed on the plate body (1) through the disassembly assembly (4). The disassembly assembly (4) comprises an insert block (41), a slot (42), a fixed block (43) and a fixed slot (44). The insert block (41) is slidably provided at one end in the length direction of the plate body (1). The slot (42) is provided at one end in the width direction of the expansion plate (3). The insert block (41) is inserted into the slot (42) by sliding. The fixed block (43) is slidably provided on a side wall of the insert block (41). The fixed slot (44) is provided on a side wall of the slot (42). The insert block (41) is inserted into the slot (42) by sliding or is accommodated in the fixed block (43).

2. The needle plate expansion structure of a flat knitting machine according to claim 1, characterized in that: A driving mechanism (5) is provided between the fixed block (43) and the inserting block (41), and the driving mechanism (5) comprises a sliding rod (51), an abutting block (52) and a wedge surface (53). The sliding rod (51) is slidingly provided at one end of the inserting block (41) away from the plate body (1), the abutting block (52) is fixed on the sliding rod (51), and the wedge surface (53) is provided at the fixed block (43) inserted into the inserting block (41). ) one end, the abutting block (52) abuts against the wedge surface (53), the sliding rod (51) slides toward the inside of the inserting block (41) to drive the abutting block (52) to slide, the abutting block (52) abuts against the wedge surface (53) to drive the fixed block (43) to slide out of the inserting block (41), an elastic member (6) is provided between the fixed block (43) and the inserting block (41), and the elastic member (6) drives the fixed block (43) to slide and be accommodated in the inserting block (41).

3. The needle plate expansion structure of a flat knitting machine according to claim 2, characterized in that: An insertion hole (7) is provided at the bottom of the slot (42), and a push rod (8) is slidably inserted into the insertion hole (7). The push rod (8) is flush with the bottom of the slot (42) or is received in the insertion hole (7) by sliding. The insertion hole (7) is adapted to the sliding rod (51). When the push rod (8) is received in the insertion hole (7), the sliding rod (51) is slidably inserted in the insertion hole (7).

4. The needle plate expansion structure for a flat knitting machine according to claim 3, characterized in that: A return spring (9) is provided between the insert block (41) and the plate body (1), and the return spring (9) drives the insert block (41) to slide and be accommodated in the plate body (1).

5. The needle plate expansion structure of a flat knitting machine according to claim 4, characterized in that: A driving rod (10) is rotatably provided on the plate body (1), one end of the driving rod (10) abuts against an insert block (41) inserted into one end of the plate body (1), and the other end of the driving rod (10) extends out from one end of the plate body (1) in the length direction.

6. The needle plate expansion structure for a flat knitting machine according to claim 5, characterized in that: An inserting block (41) is slidably provided on one end of the expansion plate (3) away from the plate body (1) in the width direction.

7. The needle plate expansion structure for a flat knitting machine according to claim 1, characterized in that: The connecting rod (2) is slidably arranged on the plate body (1), and a fixing bolt (11) is installed on the connecting rod (2), and the fixing bolt (11) fixes the connecting rod (2).

8. The needle plate expansion structure for a flat knitting machine according to claim 7, characterized in that: The connecting rod (2) comprises a sliding portion (21), a connecting portion (22) and an abutting portion (23); the sliding portion (21) is slidingly arranged on the plate body (1); the connecting portion (22) is fixed on the sliding portion (21); the connecting portion (22) extends toward one end of the plate body (1) in the longitudinal direction; the abutting portion (23) is fixed on the connecting portion (22); and the abutting portion (23) abuts against the opposite sides of the front plate (101) and the rear plate (102).

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