CN111945281A

CN111945281A - Mechanical weft shearing device

Info

Publication number: CN111945281A
Application number: CN202010900238.5A
Authority: CN
Inventors: 黄春; 周萍
Original assignee: Bijiale Suzhou Industrial Park Textile Machinery Co ltd
Current assignee: Bijiale Suzhou Industrial Park Textile Machinery Co ltd
Priority date: 2020-08-31
Filing date: 2020-08-31
Publication date: 2020-11-17

Abstract

The invention discloses a mechanical weft yarn shearing device which is arranged on a rapier loom and positioned between a weft yarn clamping device and a fabric. This application can make the fabric of production reach the effect of no slitter edge, reduce the material loss, the device simple structure, modular design can realize simple and convenient installation under the original mechanical structure state of loom, seamless switching can freely install and switch with pneumatic woof shearing mechanism, need not external air supply, use this mechanical type woof shearing mechanism on the loom simultaneously and be used for pressing from both sides tight woof device after, need not to dispose corresponding annex such as slitter edge yarn and slitter edge dish again, reduction equipment cost.

Description

Mechanical weft shearing device

Technical Field

The invention relates to the technical field of rapier looms, in particular to a mechanical weft shearing device.

Background

The existing slitter edge-free weft shearing device for the shuttleless loom is a pneumatic weft shearing device, although the device has the advantages of simple structure, flexible and simple installation, light and convenient whole device and the like, the using environment of the device needs to have stable air source supply, but the rapier loom used by the device is mostly free of air source supply in factories, so the use of the device is greatly limited.

Therefore, in combination with the above problems, a new technical solution is needed.

Disclosure of Invention

The invention aims to provide a mechanical weft yarn shearing device, which adopts a mechanical transmission non-slitter edge weft yarn shearing structure to overcome the limitation of the existing pneumatic non-slitter edge weft yarn shearing device on air source conditions, aiming at the technical defects of the existing pneumatic non-slitter edge weft yarn shearing device. The mechanical weft yarn shearing device has the advantages of simple structure and modular design, and can be simply and conveniently installed and seamlessly switched under the original mechanical structure state of the weaving machine. This application adopts cam swing arm principle, and the spring resets, utilizes cam swing arm principle drive scissors blade device closed to cut the yarn, and the scissors blade is opened in the spring reset. The application can realize extremely short selvedge burrs (namely no waste selvedge) by matching with a weft clamping device (particularly see patent CN 109415849A). This application can reach and need not slitter edge yarn and slitter edge yarn device, makes selvedge deckle edge and shorten, need not to tailor once more, can realize reducing the material loss, practices thrift the purpose of cost.

In order to achieve the purpose, according to one aspect of the invention, the invention provides a mechanical weft yarn shearing device which is arranged on a rapier loom and is positioned between a weft yarn clamping device and a fabric, and the mechanical weft yarn shearing device comprises a shearing mechanism, a transmission mechanism and a driving mechanism, wherein the shearing mechanism comprises a fixed blade and a movable blade which is rotatably connected with the fixed blade, the driving mechanism comprises a cam and a driving unit which controls the cam to rotate, the transmission mechanism is respectively connected with the cam and the movable blade, and the cam rotates to drive the transmission mechanism to act so as to drive the movable blade to reciprocate relative to the fixed blade.

In a further embodiment, the yarn guide device further comprises a supporting seat and a yarn guide plate vertically installed on the supporting seat, the yarn guide plate is provided with a working end, a yarn guide opening is formed in the yarn guide plate inwards from the working end, the fixed blade is fixed on one side of the yarn guide plate, and the cutting edge of the fixed blade is aligned with the lower edge of the yarn guide opening.

In a further embodiment, the movable blade is vertically and rotatably mounted on one side of the fixed blade, the cutting edge of the movable blade is opposite to the cutting edge of the fixed blade, and the cutting edge end of the movable blade can be driven to be close to or far away from the cutting edge of the fixed blade in a vertical plane.

In a further embodiment, the shearing mechanism further comprises a plate spring, a blade bolt and a blade nut, through holes are correspondingly formed in the yarn guide plate, the fixed blade and the movable blade respectively, the blade bolt sequentially penetrates through the through holes in the yarn guide plate, the fixed blade and the movable blade and is fixed through the blade nut, and the plate spring is installed between the movable blade and the blade nut.

In a further embodiment, the transmission mechanism comprises a transmission rod, an adjusting mechanism and a roller, the transmission rod is rotatably mounted on the supporting seat and is provided with a driven part and a driving part, the connecting end of the movable blade is connected with the driven part of the transmission rod through the adjusting mechanism, the roller is mounted on the driving part, and the transmission rod is connected with the cam through the roller.

In a further embodiment, the adjusting mechanism includes an adjusting rod, the adjusting rod is mounted at an end of the driven portion, the adjusting rod can be adjusted to move a set distance in a vertical plane relative to the transmission rod, the connecting end of the moving blade is provided with a long hole, and the adjusting rod is movably connected with the connecting end of the moving blade through the long hole.

In a further embodiment, the transmission mechanism further includes a rotating spindle, the supporting seat is provided with a mounting hole which is installed in cooperation with the rotating spindle, the rotating spindle is installed in the mounting hole, and the transmission rod is sleeved on the rotating spindle.

In a further embodiment, the bearing seat further comprises a lubricating device, a lubricating hole is formed in the bearing seat and communicated with the mounting hole, and the lubricating device is mounted on the lubricating hole.

In a further embodiment, the transmission rod further comprises an adjusting portion, the adjusting portion is located between the driven portion and the rotating main shaft, the transmission mechanism further comprises a mounting seat, a spring adjusting seat and a spring, the mounting seat is fixed on the supporting seat, a threaded hole is vertically formed in the mounting seat, the spring adjusting seat is installed in the threaded hole in a matched mode, the spring adjusting seat is located above the adjusting portion, and the spring is installed between the spring adjusting seat and the adjusting portion.

In a further embodiment, the driving mechanism further includes a clamping device disposed on the cam, the driving unit includes a driving shaft, a shaft hole is formed at a rotating shaft position of the cam, one end of the driving shaft is mounted in the shaft hole, and the clamping device is driven to clamp one end of the driving shaft.

The utility model provides a whole mechanical type woof shearing mechanism is an independent module, installs between clamping woof device and fabric to can do latitudinal direction and remove, should be close to the selvedge of fabric as far as possible during the installation, make the guide plate and the fabric selvedge on the device keep minimum distance, thereby reach the effect of no slitter edge, reduce the material loss. The mechanical weft yarn shearing device can be freely installed and switched with the pneumatic weft yarn shearing device without an external air source. After the mechanical weft yarn shearing device and the weft yarn clamping device are used on the weaving machine, corresponding accessories such as waste selvage yarns, waste selvage discs and the like do not need to be configured, and equipment cost is saved.

Drawings

FIG. 1 is a side view of a mechanical weft cutting device of the present application in one embodiment;

FIG. 2 is a schematic perspective view of a mechanical weft cutting device according to the present application in one embodiment;

FIG. 3 is a schematic perspective view of one angle of a mechanical weft cutting device of the present application in one embodiment;

FIG. 4 is a schematic perspective view of another angle of the mechanical weft cutting device of the present application in one embodiment;

fig. 5 is a schematic cross-sectional view of fig. 4 along the dotted line.

Wherein, 1-weft yarn shearing device, 11-shearing mechanism, 111-stationary blade, 112-movable blade, 113-plate spring, 114-blade bolt, 115-blade nut, 12-transmission mechanism, 121-transmission rod, 1211-driven part, 1212-driving part, 1213-adjusting part, 122-adjusting mechanism, 1221-adjusting rod, 1222-adjusting screw, 1223-adjusting nut, 123-roller, 124-rotating spindle, 125-mounting seat, 126-spring adjusting seat, 127-spring, 13-driving mechanism, 131-cam, 1311-shaft hole, 132-clamping device, 133-driving shaft, 14-supporting seat, 15-yarn guide plate, 151-weft yarn guide opening, 16-lubricating device and 2-selecting device, 3-weft gripper, 4-guide piece, 5-weft clamping device, 6-weft clamp, 7-weft, 8-fabric, 81-selvedge.

Detailed Description

To further explain the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects according to the present invention will be given with reference to the accompanying drawings and preferred embodiments.

Referring to fig. 1 to 5, fig. 1 is a side view of a mechanical weft cutting device according to one embodiment of the present invention; FIG. 2 is a schematic perspective view of a mechanical weft cutting device according to the present application in one embodiment; FIG. 3 is a schematic perspective view of one angle of a mechanical weft cutting device of the present application in one embodiment; FIG. 4 is a schematic perspective view of another angle of the mechanical weft cutting device of the present application in one embodiment; fig. 5 is a schematic cross-sectional view of fig. 4 along the dotted line.

Examples

The present embodiment provides a mechanical weft cutting device which is mounted on a rapier loom and is located between the weft clamping device 5 and the fabric 8. As shown in fig. 1 and 2, the rapier weaving machine is shown only partially with a weft guiding system comprising a weft selection device 2, a weft gripper 3 and a weft clamping device 5. The weft selection device 2 is used to select a weft thread 7. The weft gripper 3 serves for gripping one or more weft threads selected by the action of the weft selection device 2 and for introducing the gripped weft thread 7 into the shed. The detailed structure of the weft yarn clamping device 5 is shown in patent application CN 109415849A, which comprises a guide sheet 4 and a weft yarn clamp 6. In use, the weft clamping device 5 and the mechanical weft cutting device of the present application are both mounted on a rapier loom and can be individually moved to adjust the position. In fig. 1, four weft yarns are schematically shown, and in a specific embodiment, the number of weft yarns 7 can be designed as desired. The weft clamping device 5 is arranged for clamping a weft thread 7 during beating-up of the weaving machine and for holding a plurality of weft threads after the weft cutting device 1 cuts the weft thread 7. After one of these weft threads is held by the weft thread gripper 3, the weft thread 7 drawn over the guide sheet 4 extends from the weft selection device 2 via the weft clamping device 5 and the weft cutting device 1 to the selvedge 81 and the fabric 8 with weft thread. As shown in fig. 1, selvage 81 is the side edge formed by the warp yarns of fabric 8, while the weft yarns are the weft beat-up edges of fabric 8. After the weft thread 7 has been gripped by means of the weft thread gripping device 5, the gripped weft thread 7 is cut by the mechanical system 1 arranged between the weft thread gripping device 5 and the selvedge 81. During the subsequent weft insertion, one of the weft threads 7 of the selection device 2 is held by the weft gripper 3, the leading end of which is then pulled out of the clamping weft device 5 and is introduced into the shed of the fabric 8. After weft insertion, the weft yarns are beaten by a reed and move into the blade edges of the scissors of the weft yarn clamping device 5 and the mechanical weft yarn cutting device 1. The mechanical weft cutting device 1 and the weft clamping device 5 constitute functional units or modules which can be mounted at corresponding positions on the rapier loom and are adjusted in the weft direction and warp direction with respect to the movement path of the weft gripper 3 (rapier head), the fabric 8 and the selvedge 81 and are mounted and fixed at suitable positions.

In this embodiment, the mechanical weft cutting device 1 includes a support seat 14, a cutting mechanism 11, a transmission mechanism 12, a driving mechanism 13, and a yarn guide plate 15.

As shown in fig. 3 to 5, the shearing mechanism 11 includes a fixed blade 111 and a movable blade 112 rotatably connected to the fixed blade 111. The shear mechanism 11 further comprises a leaf spring 113, a blade bolt 114 and a blade nut 115. The yarn guide plate 15 and the fixed blade 111 are vertically and fixedly installed on the supporting seat 14 through screws, and the fixed blade 111 is located on one side of the yarn guide plate 15, namely between the yarn guide plate 15 and the supporting seat 14. The yarn guide plate 15 has a working end, i.e. the leftmost end of the yarn guide plate 15 in the figure, a yarn guide opening 151 is formed in the yarn guide plate 15 from the working end to the inside, and the cutting edge of the fixed blade 111 is aligned with the lower edge of the yarn guide opening 151. Preferably, the yarn guide opening 151 is designed to be flared, i.e., the size of the yarn guide opening 151 at the edge of the yarn guide plate 15 is larger, and gradually and smoothly transits inwards to be horizontal and aligned with the cutting edge of the fixed blade 111. The structural design can ensure that the weft yarns 7 can smoothly enter the shearing mechanism 11, namely, between the cutting edges of the movable blade 112 and the fixed blade 111 during working. The yarn guide plate 15, the fixed blade 111 and the movable blade 112 are respectively and correspondingly provided with a through hole, the through hole on the movable blade 112 is arranged in the middle or near the middle of the movable blade 112, and the blade bolt 114 sequentially penetrates through the through holes on the yarn guide plate 15, the fixed blade 111 and the movable blade 112 and is fixed through the blade nut 115, so that the movable blade 112 is rotatably and vertically arranged on one side of the fixed blade 111 far away from the yarn guide plate 15. The cutting edge of the movable blade 112 is opposite to the cutting edge of the fixed blade 111 to form a structure similar to a scissor shape, and the cutting edge end of the movable blade 112 can be driven to be close to or far away from the cutting edge of the fixed blade 111 in a vertical plane. In this embodiment, the movable blade 112 may be an integrally formed blade, or a blade mounted on a carrier, and if the latter is adopted, when the blade is damaged, a user only needs to replace the blade, so that on one hand, the replacement cost can be saved, and on the other hand, the replacement time can be shortened. In the embodiment, the plate spring 113 is further installed between the movable blade 112 and the blade nut 115, and the proper deformation of the plate spring 113 can enable the cutting edge of the movable blade 112 to be tightly attached to the cutting edge of the fixed blade 111, so that the phenomenon that the shearing effect is poor due to the fact that a gap exists between the two blades when the device is used for a long time in the later period is effectively solved.

The driving mechanism 13 includes a cam 131 and a driving unit for controlling the rotation of the cam 131, the transmission mechanism 12 is respectively connected with the cam 131 and the movable blade 112, and the cam 131 rotates to drive the transmission mechanism 12 to move, so as to drive the movable blade 112 to reciprocate relative to the fixed blade 111. The driving mechanism 13 further includes a clamping device 132 disposed on the cam 131, the driving unit includes a driving shaft 133, a shaft hole 1311 is formed at a rotation shaft position of the cam 131, one end of the driving shaft 133 is installed in the shaft hole 1311, and the clamping device 132 is driven to clamp one end of the driving shaft 133. The driving unit further includes a driving device such as a driving motor, which is used to drive the driving shaft 133 to rotate, so as to drive the cam 131 to rotate, and finally drive the transmission rod 121 to swing back and forth.

The transmission mechanism 12 includes a transmission rod 121 (swing arm), an adjustment mechanism 122, and a roller 123. The driving rod 121 is rotatably mounted on the supporting base 14. Preferably, the transmission mechanism 12 further includes a rotating main shaft 124, a mounting hole is formed in the support seat 14 and is matched with the rotating main shaft 124, the rotating main shaft 124 is mounted in the mounting hole, and the transmission rod 121 is sleeved on the rotating main shaft 124. As shown, the driving rod 121 is approximately L-shaped, and the rotating main shaft 124 is disposed at a corner of the driving rod 121 to form an approximately lever structure. The transmission rod 121 has a driven portion 1211, an adjusting portion 1213 and a driving portion 1212 in sequence, the adjusting portion 1213 is located between the driven portion 1211 and the main rotating shaft 124, i.e. the leftmost end of the connecting rod shown in fig. 5 is bent slightly obliquely upward to form the driven portion 1211, the left side near-horizontal portion of the main rotating shaft 124 is the adjusting portion 1213, and the driving portion 1212 is located below the main rotating shaft 124. The connecting end of the movable blade 112 is connected to the driven portion 1211 of the transmission rod 121 through the adjusting mechanism 122, the roller 123 is installed in the driving portion 1212, and the transmission rod 121 is connected to the cam 131 through the roller 123. As shown in fig. 3, the driving portion 1212, i.e., the end of the transmission rod 121 near the cam 131, and the roller 123 may be fixed to the driving portion 1212 in a rotatable or non-rotatable manner by a screw or the like. In practical implementation, the roller 123 is in contact connection with the cam 131 of the cam 131 on the curved surface. The radius of the curved surface of the cam 131 is optimally designed, and by using the radius difference of the curved surface of the cam 131, the roller 123 can be driven to rotate in a reciprocating manner by a certain angle around the rotating main shaft 124 as an axis along with the high-speed rotation of the cam 131, and then the driven end of the driving rod 121 is driven to swing in a reciprocating manner by a certain angle around the rotating main shaft 124 as an axis, so that the movable blade 112 is driven to rotate in a reciprocating manner around the blade bolt 114 as an axis, and the opening and closing actions between the movable blade 112 and the fixed blade 111 are realized in one. Meanwhile, the driving rod 121 is also designed to be light, so that the swing arm movement of the whole cam 131 has excellent movement characteristics.

In a further embodiment, the actuator 12 further includes a mounting block 125, a spring adjustment block 126, and a spring 127. The mounting seat 125 is fixedly mounted on the supporting seat 14 by screws. A threaded hole is vertically formed in the mounting seat 125, the spring adjusting seat 126 is installed in the threaded hole in an external thread manner in a matching manner, the spring adjusting seat 126 is located above the adjusting portion 1213, and the spring 127 is installed between the spring adjusting seat 126 and the adjusting portion 1213. The spring 127 may be movably sleeved at the bottom end of the spring adjusting seat 126, or may be in other manners as long as it is ensured that the spring 127 can be always located between the spring adjusting seat 126 and the adjusting portion 1213. The spring adjustment seat 126 shown in fig. 1 to 5 has an adjustment hole such as a hexagonal hole at the upper end thereof, and a user can adjust the height of the spring adjustment seat 126 up and down by using a hexagonal wrench or other tool to adjust the compression amount of the spring 127, and then adjust the force of the spring on the adjustment portion 1213 of the transmission rod 121, so that the roller 123 fixed to the driving portion 1212 of the adjustment rod 1221 abuts against the curved surface of the cam 131 with a proper force.

In a further embodiment, it further comprises a lubricating device 16, preferably a grease nipple, in which grease is stored. The supporting seat 14 is provided with a lubrication hole at a proper position, the lubrication hole is communicated with the mounting hole, the lubricating device 16 is installed on the lubrication hole, and lubricating grease can be added into the mounting hole through the lubrication hole to lubricate between the rotating main shaft 124 and the inner wall of the mounting hole.

In a further embodiment, the adjustment mechanism 122 includes an adjustment lever 1221. The adjustment lever 1221 is mounted at an end of the driven portion 1211, and the adjustment lever 1221 can be adjusted to move a set distance in a vertical plane with respect to the driving lever 121. Preferably, the adjustment rod 1221 is attached to an end of the driven portion 1211 by a screw, and a long through hole is formed at a middle position of the adjustment rod 1221, and a longitudinal direction of the long through hole is aligned with a longitudinal direction of the adjustment rod 1221. The screw is slidable in the elongated through hole. Meanwhile, the adjusting rod 1221 has a connecting end and an adjusting end, the adjusting end is provided with an adjusting device, the adjusting rod 1221 can move for a set distance along the length direction of the screw rod under the limitation of the screw rod by adjusting the adjusting device, so that the moving blade 112 is adjusted at a proper position to obtain a shearing opening with a proper size. The adjusting device may be an adjusting screw 1222 and an adjusting nut 1223, the adjusting screw 1222 may be fixed to the driven end of the driving rod 121, the adjusting screw 1222 has a length direction corresponding to the adjusting rod 1221, and the adjusting nut 1223 is mounted on the adjusting screw 1222. The adjusting nut 1223 can be rotatably installed at the adjusting end of the adjusting rod 1221, and of course, the adjusting nut 1223 may not be installed on the adjusting rod 1221, and is a free body, and can also adjust the adjusting rod 1221 to a certain extent. Similarly, the adjusting screw 1222 may be fixed to the adjusting end of the adjusting rod 1221, and the adjusting nut 1223 may be rotatably fixed to the driven end of the driving rod 121 by other structures, such as a bracket, etc., to adjust the position of the adjusting rod 1221. As long as the adjusting screw 1222 and the adjusting nut 1223 can drive the adjusting rod 1221 and the transmission rod 121 to move relatively.

The connecting end of the moving blade 112 is provided with a long hole, and the adjusting rod 1221 is movably connected with the connecting end of the moving blade 112 through the long hole. For example, the screw may be fixed on the connecting end of the adjusting rod 1221 and extend into the elongated hole of the movable blade 112.

The utility model provides a whole mechanical type woof shearing mechanism is an independent module, installs between clamping woof device and fabric to can do latitudinal direction and remove, should be close to the selvedge of fabric as far as possible during the installation, make the guide plate and the fabric selvedge on the device keep minimum distance, thereby reach the effect of no slitter edge, reduce the material loss. The whole weft shearing device 1 is driven by the cam to drive the transmission rod to swing in a reciprocating mode, so that the movable blade is driven to rotate in a reciprocating mode, and opening and closing actions are formed between the movable blade and the fixed blade in one weaving period. When the weft yarn gripper grips any one of the weft yarns to enter a shed of a fabric and finishes the whole weft insertion action, the weft yarns are pushed into a cutting edge formed by the opening state of a fixed blade and a movable blade of a cutting device through a yarn guide sheet on a weft yarn clamping device and a yarn guide plate on a mechanical weft yarn cutting device 1 by beating motion of the weaving machine, a driving rod and the movable blade are driven by a cam, the cutting edge of a cutting mechanism is closed, and the weft yarns in the cutting edge are cut. The mechanical weft yarn shearing device can be freely installed and switched with the pneumatic weft yarn shearing device without an external air source. After the mechanical weft yarn shearing device and the weft yarn clamping device are used on the weaving machine, corresponding accessories such as waste selvage yarns, waste selvage discs and the like do not need to be configured, and equipment cost is saved.

As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, including not only those elements listed, but also other elements not expressly listed.

In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.

The features of the embodiments and embodiments described herein above may be combined with each other without conflict.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The utility model provides a mechanical type woof shearing mechanism, its installs on rapier weaving machine to be located and press from both sides between woof device (5) and fabric (8), its characterized in that, it includes shearing mechanism (11), drive mechanism (12) and actuating mechanism (13), shearing mechanism (11) including stationary blade (111) and with stationary blade (111) rotatable coupling's moving blade (112), actuating mechanism (13) include cam (131) and control cam (131) pivoted drive unit, drive mechanism (12) respectively with cam (131) and moving blade (112) are connected, cam (131) rotate drive mechanism (12) action, drive then moving blade (112) relatively stationary blade (111) reciprocating motion.

2. The mechanical weft cutting device according to claim 1, characterized in that it further comprises a support base (14) and a yarn guide plate (15) vertically mounted on the support base (14), the yarn guide plate (15) has a working end, a yarn guide opening (151) is opened on the yarn guide plate (15) from the working end inwards, the fixed blade (111) is fixed on one side of the yarn guide plate (15), and the cutting edge of the fixed blade (111) is aligned with the lower edge of the yarn guide opening (151).

3. The mechanical weft shearing device according to claim 2, characterized in that the movable blade (112) is vertically installed at one side of the fixed blade (111) in a rotatable manner, the cutting edge of the movable blade (112) is opposite to the cutting edge of the fixed blade (111), and the cutting edge end of the movable blade (112) can be driven to be close to or far from the cutting edge of the fixed blade (111) in a vertical plane.

4. The mechanical weft shearing device according to claim 3, characterized in that the shearing mechanism (11) further comprises a plate spring (113), a blade bolt (114) and a blade nut (115), through holes are correspondingly formed in the yarn guide plate (15), the fixed blade (111) and the movable blade (112) respectively, the blade bolt (114) sequentially penetrates through the through holes in the yarn guide plate (15), the fixed blade (111) and the movable blade (112) and is fixed through the blade nut (115), and the plate spring (113) is installed between the movable blade (112) and the blade nut (115).

5. The mechanical weft cutting device according to claim 2, characterized in that the transmission mechanism (12) comprises a transmission rod (121), an adjusting mechanism (122) and a roller (123), the transmission rod (121) is rotatably mounted on the support base (14), the transmission rod (121) has a driven part (1211) and a driving part (1212), the connecting end of the movable blade (112) is connected with the driven part (1211) of the transmission rod (121) through the adjusting mechanism (122), the roller (123) is mounted on the driving part (1212), and the transmission rod (121) is connected with the cam (131) through the roller (123).

6. The mechanical weft cutting device according to claim 5, characterized in that the adjusting mechanism (122) comprises an adjusting rod (1221), the adjusting rod (1221) is mounted at the end of the driven part (1211), the adjusting rod (1221) can be adjusted to move a set distance in a vertical plane relative to the driving rod (121), the connecting end of the movable blade (112) is provided with a long hole, and the adjusting rod (1221) is movably connected with the connecting end of the movable blade (112) through the long hole.

7. The mechanical weft cutting device according to claim 5, characterized in that the transmission mechanism (12) further comprises a rotating main shaft (124), the supporting seat (14) is provided with a mounting hole matched with the rotating main shaft (124), the rotating main shaft (124) is mounted in the mounting hole, and the transmission rod (121) is sleeved on the rotating main shaft (124).

8. The mechanical weft cutting device according to claim 7, characterized in that it further comprises a lubricating device (16), a lubricating hole is opened on the supporting seat (14), the lubricating hole is communicated with the mounting hole, and the lubricating device (16) is mounted on the lubricating hole.

9. Mechanical weft cutting device according to claim 7, characterized in that the transmission rod (121) further comprises an adjustment part (1213), the adjustment part (1213) being located between the follower part (1211) and the rotating main shaft (124),

the transmission mechanism (12) further comprises a mounting seat (125), a spring adjusting seat (126) and a spring (127), the mounting seat (125) is fixed on the supporting seat (14), a threaded hole is vertically formed in the mounting seat (125), the spring adjusting seat (126) is installed in the threaded hole in a matching mode, the spring adjusting seat (126) is located above the adjusting portion (1213), and the spring (127) is installed between the spring adjusting seat (126) and the adjusting portion (1213).

10. The mechanical weft cutting device according to claim 1, characterized in that the driving mechanism (13) further comprises a clamping device (132) arranged on the cam (131), the driving unit comprises a driving shaft (133), a shaft hole (1311) is opened at the rotating shaft position of the cam (131), one end of the driving shaft (133) is installed in the shaft hole (1311), and the clamping device (132) is driven to clamp one end of the driving shaft (133).