Thread take-up mechanism

Abstract

The present invention discloses a thread picking mechanism (200) for the silk thread assembly of a lens suspension device. Among them, the lens suspension device includes a shrapnel and a silk thread, and the silk thread is fixed to the shrapnel. The thread picking mechanism (200) has a base (210), and a first guiding portion (220) is arranged on the base (210). The first guiding portion (220) guides along a straight line direction. A thread picking portion (230) is arranged on the first guiding portion (220). The thread picking portion (230) is arranged to be driven along the guiding direction of the first guiding portion (220) so as to bend the silk thread when the silk thread is pulled to the installation preset position on the shrapnel. The thread picking mechanism (200) of the present invention can improve the thread picking accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of factory automation, and particularly to a thread picking mechanism. Background Art

[0002] With the development of various electronic products such as digital cameras, computers, tablet computers, smart phones, etc., higher and higher requirements are put forward for their imaging functions. The lens suspension (OIS component) often used in high-quality imaging camera lenses is also used in these electronic products.

[0003] The lens suspension generally includes a base, a lens carrier, a coil, a shrapnel, a silk thread, etc. Among them, the silk thread is fixed to the shrapnel. Due to the small overall size of the lens suspension of the imaging system, its assembly difficulty is very high. Especially for the slender silk thread, its assembly is very difficult. For example, when the silk thread is fixed to the shrapnel, due to thermal expansion and contraction, the slender silk thread may break, resulting in the entire lens suspension being unable to work.

[0004] In view of this, research and development of a thread picking mechanism has been carried out. However, although the known thread picking mechanism can bend the silk thread to ensure that there is still a certain amount of expansion and contraction margin after the silk thread is fixed to the shrapnel, there is still the technical problem of low thread picking accuracy. Summary of the Invention

[0005] In order to at least to a certain extent improve the thread picking accuracy of the thread picking mechanism, the present invention proposes a thread picking mechanism.

[0006] A thread picking mechanism for the silk thread assembly of a lens suspension, wherein the lens suspension includes a shrapnel and a silk thread, and the silk thread is fixed to the shrapnel. The thread picking mechanism has a base, and a first guiding portion is provided on the base. The first guiding portion guides along a straight line direction, and a thread picking portion is provided on the first guiding portion. The thread picking portion is arranged to be driven along the guiding direction of the first guiding portion to bend the silk thread when the silk thread is pulled to the installation preset position on the shrapnel.

[0007] In some embodiments, the thread picking portion includes a first connecting block and a thread picking piece. The first connecting block is installed on the first guiding portion, and the thread picking piece is installed on the first connecting block.

[0008] In some embodiments, a connecting rod portion is further included. The connecting rod portion is installed on the base. One end of the connecting rod portion can abut against the thread picking portion, and the other end of the connecting rod portion can be driven to drive the thread picking portion and bend the silk thread.

[0009] In some embodiments, a second guiding portion is further included. The second guiding portion is mounted to the base. The second guiding portion is parallel to the first guiding portion. A driving transfer block is mounted on the second guiding portion. The other end of the connecting rod portion can abut against the driving transfer block.

[0010] In some embodiments, a first limiting portion is further included. The first limiting portion is mounted to the base and limits the stroke of the thread taking-up portion in the direction where the silk thread is driven.

[0011] In some embodiments, the first limiting portion has a micrometer head which adjusts and limits the stroke of the thread taking-up portion in the direction where the silk thread is driven.

[0012] In some embodiments, a second limiting portion is further included. The second limiting portion is mounted to the base and limits the stroke of the thread taking-up portion in the direction away from the silk thread when being driven.

[0013] In some embodiments, a reset portion is further included. One end of the reset portion is connected to the base, and the other end is connected to the thread taking-up portion, and drives the thread taking-up portion to abut against the second limiting portion.

[0014] In some embodiments, the reset portion includes a compression spring with one end abutting against the base and the other end abutting against the thread taking-up portion, and / or a tension spring with one end connected to the base and the other end connected to the thread taking-up portion.

[0015] In some embodiments, a third limiting member is further included. The third limiting member is mounted to the base. The first connecting block is provided with a third groove portion which is adapted to the third limiting member. The third limiting member is inserted into the third groove portion to limit the stroke of the first connecting block when being driven.

[0016] For the thread taking-up mechanism of the present invention, since the thread taking-up portion is mounted to the first guiding portion which is guided in a straight line direction, therefore, the thread taking-up portion can bend the silk thread straightly, and the precision can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a perspective view of an embodiment of the thread taking-up mechanism of the present invention;

[0018] Figure 2 is Figure 1 a partial enlarged view of A;

[0019] Figure 3 is Figure 1 a partial cross-sectional view of the thread taking-up mechanism;

[0020] Figure 4 is a perspective view of another embodiment of the thread taking-up mechanism of the present invention;

[0021] Figure 5Yes Figure 4 Partial sectional view of the thread take-up mechanism

[0022] Figure 6 Figure 6 is a simplified schematic diagram of an embodiment of a lens mount, where (a) shows the lens mount observed from a top-down direction, and (b) shows a partial enlarged view of the relative position of the silk thread and the elastic piece of the lens mount. Detailed implementation mode

[0023] The present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the present invention can be implemented in many different ways and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to enable those skilled in the art to understand the disclosed content of the present invention more thoroughly and comprehensively.

[0024] In the description of the embodiments of the present invention, if it involves orientation description, such as "up", "down", "front", "back", "left", "right", etc., the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it should not be construed as a limitation of the present invention.

[0025] In the description of the embodiments of the present invention, if a certain feature is referred to as "set", "fixed", "connected", "installed" on another feature, it can be directly set, fixed, connected, or installed on another feature, or indirectly set, fixed, connected, or installed on another feature. In the description of the embodiments of the present invention, if it involves "several", its meaning is more than one. If it involves "multiple", its meaning is more than two. If it involves "greater than", "less than", "exceeding", it should be understood as not including the number itself. If it involves "above", "below", "within", it should be understood as including the number itself. If it involves "first", "second", it should be understood as used to distinguish technical features, rather than indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0026] In addition, for the same or similar technical features in different embodiments, the same symbols are given and will not be repeated unless necessary.

[0027] Figure 6 Figure 6 is a simplified schematic diagram of an embodiment of a lens mount 100, where (a) shows the lens mount 100 observed from a top-down direction, and (b) shows a partial enlarged view of the relative position of the silk thread 101 and the elastic piece 102 of the lens mount 100. For ease of understanding, first refer to Figure 6(a) and (b) of the following illustrate the basic processes on the wire 101. In the lens suspension 100, there is a shape memory alloy (SMA) wire 101, hereinafter simply referred to as wire 101, and there is also a spring piece 102. A plurality of wires 101 are arranged to surround the outer periphery of the spring piece 102 and are respectively fixed to the spring piece 102. The specific fixing structure is that a plurality of bending edges (also called clamping claws) 102a are respectively provided on the outer side (outer periphery) of the spring piece 102, and two bending edges 102a on the same side fix one wire 101. Here, the same side means: the same side of the same side of the spring piece 102. For example, when the spring piece 102 is quadrilateral, it has four sides. Similarly, when the spring piece 102 is hexagonal or octagonal, it has six sides or eight sides. The two bending edges 102a on the same side are respectively located at both ends of one side of the spring piece 102 and respectively fit the spring piece body 102b to press the wire 101. The number of sides of the spring piece 102 is the same as the number of wires 101. For example, when the spring piece 102 is quadrilateral, there are four wires 101. In addition, although in the lens suspension 100 described here, two bending edges 102a on the same side fix one wire 101, it is not limited to this. Due to different processes, it is also possible that one bending edge 102a clamps one wire 101, or more than two bending edges 102a clamp one wire 101, which will not be listed one by one here. Before press-fitting, the angle between the bending edge 102a and the spring piece body 102b can be a preset angle, such as 30 degrees - 60 degrees. Before the wire 101 is press-fitted, it is pulled to the preset installation position on the spring piece body 102a, that is, between the bending edge 102a and the spring piece body 102b. Then the bending edge 102a is pressed towards the spring piece body 102b and fits the spring piece body 102b to press the wire 101 onto the spring piece 102, completing the threading work of the wire 101.

[0028] The thread take-up mechanism 200 of the present invention is used to bend (take up the thread) the wire 101 with higher precision when the wire 101 is pulled to the preset installation position on the spring piece 102, so as to ensure that there is still a certain amount of expansion and contraction margin after the wire 101 is fixed to the spring piece 102, thereby preventing the wire 101 from breaking due to thermal expansion and contraction, etc.

[0029] Figure 1 is a perspective view of the thread take-up mechanism 100a, Figure 2 is Figure 1 a partial enlarged view at A, Figure 3 is a partial cross-sectional view of the thread take-up mechanism 100a, referring to Figures 1 to 3 and with the assistance of reference to Figure 6, in some embodiments, the thread picking mechanism 200a (200) can be installed on the thread feeding machine (not shown) of the lens mount 100 for assembling the thread 101 of the lens mount 100. The lens mount 100 includes a shrapnel 102 and a thread 101, and the thread 101 is fixed to the shrapnel 102. In some embodiments, the thread picking mechanism 200 has a base 210, on which a first guiding portion 220 is provided. The first guiding portion 220 guides in a linear direction (the up-and-down direction shown in the figure). A thread picking portion 230 is provided on the first guiding portion 220. The thread picking portion 230 is arranged to be driven along the guiding direction of the first guiding portion 220 to bend the thread 101 when the thread 101 is pulled to the preset installation position on the shrapnel 102.

[0030] In this embodiment, since the thread picking portion 230 is installed on the first guiding portion 220 that guides in a linear direction, the thread picking portion 230 can feed linearly and perpendicularly to the thread 101 during the process of bending the thread 101, preventing the thread 101 from slipping on the thread picking portion 230. Thus, the feeding stroke of the thread picking portion 230 from the moment it abuts against the thread 101 to the stop can be ensured. This stroke is the bending stroke of the thread 101. Therefore, the accuracy of bending (thread picking) the thread 101 can be improved. Based on determining the position where the thread 101 is fixed on the bending edge 102a, according to the position where the thread picking portion 230 abuts against the thread 101 and the bending stroke of the thread 101, using the formula for calculating the hypotenuse of a right triangle, the length of the thread 101 clamped by the bending edge can be calculated.

[0031] It can be conceived that the first guiding portion 220 can be an automated component well-known to those skilled in the art, such as a linear slide rail, directly installed on the base 210, and the thread picking portion 230 is directly installed on the first guiding portion 220. Additionally, the first guiding portion 220 can also be a guiding mechanism such as a dovetail groove, trapezoidal groove, or guiding hole directly provided on the base 210. Correspondingly, the thread picking portion 230 is arranged in a structure adapted to the dovetail groove, trapezoidal groove, or guiding hole, etc. For example, a guiding hole can be provided on the base 210, and the first connecting block of the thread picking portion 230 is arranged in a shaft shape (described later), and thus slides in the guiding hole. To prevent the thread picking portion 230 from rotating, a third restricting member (described later) for limiting the first connecting block 231 can be provided on the base 210.

[0032] It can be conceived that the thread picking part 230 can be linearly driven in any direction to abut against the silk thread 101 and bend the silk thread 101. For example, when the silk thread 101 is pulled horizontally (in the direction parallel to the ground) between the bending edge 102a and the main body 102b of the elastic piece 102, the thread picking part 230 is arranged above or below the vertical direction (for example, the direction perpendicular to the ground) of the silk thread 101 and is driven in the vertical direction. In this case, the first guiding part 220 is arranged to guide in the vertical direction.

[0033] It can be conceived that when the silk thread threading machine has an installation space, the thread picking part 230 can be driven by any known actuating element and bend the silk thread 101. It can be driven in a direct drive manner or an indirect drive manner. As a direct drive manner, for example, when the silk thread threading machine has sufficient installation space, the thread picking part 230 can be directly connected to a driving device 300 such as a cylinder or a motor and driven by the cylinder or the motor. As an indirect drive manner, for example, when the installation space of the silk thread threading machine is compact, the thread picking part 230 can be driven by a transfer device (such as a connecting rod part, etc.) by the driving device 300 (such as a pressing cylinder for pressing the silk thread 101).

[0034] In some embodiments, in order to facilitate the installation of the thread picking part 230 and improve the accuracy of thread picking, the thread picking part 230 includes a first connecting block 231 and a thread picking piece 232. The first connecting block 231 is installed on the first guiding part 220, and the thread picking piece 232 is installed on the first connecting block 231. Specifically, the first connecting block 231 can be in the shape of a cuboid block, and the first connecting block 231 is provided with mounting holes for connecting to the first guiding part 220, for example, connecting to a linear slide rail. The thread picking piece 232 is installed on the upper part of the first connecting block 231, and the thickness of the thread picking piece 232 is, for example, 0.1 mm to 0.5 mm to ensure that when the thread picking piece 232 bends (picks up) the silk thread 101, it will not interfere with other components of the lens suspension 100, such as the elastic piece 102. When the thread picking mechanism 200 is arranged on the silk thread threading machine, the thread picking piece 232 is arranged below the silk thread 101, that is, between the silk thread 101 and the main body of the elastic piece 102, to prevent the thread picking piece 232 from interfering with the wire pulling mechanism (not shown) of the silk thread threading machine. In this case, when the thread picking part 230 is driven upward in the vertical direction from bottom to top, the thread picking piece 232 approaches the silk thread 101 and can bend the silk thread 101, and when the thread picking part 230 is driven downward in the vertical direction from top to bottom, the thread picking piece 232 moves away from the silk thread 101.

[0035] It can be conceived that although an example with the first connecting block 231 and the thread picking piece 232 has been described here, it is not limited thereto. The thread picking part can also be composed of only one sheet metal part, or the first connecting block 231 and the thread picking piece 232 can be integrally processed and formed, etc.

[0036] In some embodiments, a connecting rod portion 240 is further included. The connecting rod portion 240 is mounted to the base 210. One end 241 of the connecting rod portion 240 can abut against the thread picking portion 230, and the other end 242 of the connecting rod portion 240 can be driven to drive the thread picking portion 230 and bend the silk thread 101. For example, the connecting rod portion 240 has a connecting rod member 243. One end 245 of the connecting rod member 243 can abut against the thread picking portion 230, such as abutting against the first connecting block 231. The other end 246 of the connecting rod member 243 can be driven by the driving device 300. The connecting rod member 243 is provided with a hinge hole 244. Correspondingly, a hinge shaft 212 is provided on the base 210. The connecting rod member 243 is mounted to the base 210 through the hinge connection of the hinge hole 244 and the hinge shaft 212, and is driven by the driving device 300, so that it can swing in the up and down direction on the base 210. When the end 245 of the connecting rod member 243 abutting against the first connecting block 231 is driven to swing upward, the first connecting block 231 is pushed to slide upward and drive the thread picking piece 232 to move upward. Thus, it is possible to realize the arrangement of the driving device 300 above the base 210 and enable the thread picking portion 230 to move upward in the up and down direction from bottom to top. In addition, since the driving device 300 can be arranged above the base 210, the driving device 300 of other components of the silk thread threading machine, such as the driving device 300 of the pressing portion, can be used as the driving device 300 of the thread picking mechanism 200.

[0037] In some embodiments, in order to more easily drive one end 241 of the connecting rod portion 240, a second guiding portion 250 is further included. The second guiding portion 250 is mounted on the base 210. The second guiding portion 250 is parallel to the first guiding portion 220. A driving transfer block 251 is mounted on the second guiding portion 250. The other end 242 of the connecting rod portion 240 can abut against the driving transfer block 251. The second guiding portion 250 can be arranged in the same way as the first guiding portion 220. For example, a linear slide rail can be used, or a dovetail groove, a trapezoidal groove, or a guiding hole directly provided on the base 210 can be used. Specifically, for example, the first guiding portion 220 is arranged on one side of the base 210, the second guiding portion 250 is arranged on the other side of the base 210, and the connecting rod portion 240 is arranged between the first guiding portion 220 and the second guiding portion 250 and above the first guiding portion 220 and the second guiding portion 250. An upper portion of the first connecting block 231 is provided with a first groove portion 234. One end 241 of the connecting rod portion 240 extends into the first groove portion 234 and abuts against the upper side of the first groove portion 234. An upper portion of the driving transfer block 251 is provided with a second groove portion 252. The other end 242 of the connecting rod portion 240 extends into the second groove portion 252 and abuts against the upper side of the second groove portion 252. The driving device 300 drives downward from above the driving transfer block 251, thereby causing one end 246 of the connecting rod member 243 connected to the driving transfer block 251 to swing downward and causing the other end 245 of the connecting rod member 243 connected to the driving first connecting block 231 to swing upward.

[0038] In some embodiments, in order to further improve the accuracy of the thread take-up portion 230 in bending (taking up) the silk thread 101, a first limiting portion 260 is further included. The first limiting portion 260 is mounted on the base 210 and limits the driving stroke of the thread take-up portion 230 toward the silk thread 101. Specifically, for example, when the thread take-up portion 230 is driven in the up-and-down direction, the first limiting portion 260 is arranged to limit the upward sliding stroke of the thread take-up portion 230. Thus, as a mechanical limit, the first limiting portion 260 can ensure the stability of the upward sliding stroke of the thread take-up portion 230 and improve the accuracy of the thread take-up portion 230 in bending the silk thread 101.

[0039] In some embodiments, in order to precisely adjust the limiting position of the first limiting portion 260, the first limiting portion 260 has a micrometer head 261. The micrometer head 261 adjusts and limits the driving stroke of the thread take-up portion 230 toward the silk thread 101. The micrometer head 261 can be an adjustment tool well known to those skilled in the art that can finely adjust the stroke. When the thread take-up portion 230 is driven upward, the first connecting block 231 abuts against the micrometer head 261 and is thus limited by the micrometer head 261. By providing the micrometer head 261, the upward driving stroke of the thread take-up portion 230 can be adjusted very precisely, thereby precisely adjusting the length of the silk thread 101 being bent.

[0040] In some embodiments, in order to limit the stroke of the thread take-up portion 230 during resetting and prevent the thread take-up portion 230 from colliding with the elastic piece 102, a second limiting portion 270 is further included. The second limiting portion 270 is mounted to the base 210 and limits the stroke of the thread take-up portion 230 being driven in a direction away from the silk thread 101. Specifically, for example, when the thread take-up portion 230 is driven in the vertical direction, the second limiting portion 270 is arranged to limit the downward sliding stroke of the thread take-up portion 230. Thus, the second limiting portion 270 serves as a mechanical limit, which can ensure the stability of the downward sliding stroke of the thread take-up portion 230 and prevent the thread take-up portion 230 from colliding with the elastic piece 102.

[0041] It can be conceived that, whether it is the first limiting portion 260 or the second limiting portion 270, as long as there is sufficient installation space, components well-known to those skilled in the art such as limiting blocks, limiting pins, limiting bolts, hydraulic buffers, etc. can be used.

[0042] In some embodiments, in order to enable the thread take-up portion 230 to freely reset when not being driven, a reset portion 280 is further included. One end of the reset portion 280 is connected to the base 210, and the other end is connected to the thread take-up portion 230, and drives the thread take-up portion 230 to abut against the second limiting portion 270. Specifically, for example, the reset portion 280 may include a compression spring 281. One end of the compression spring 281 abuts against the base 210, and the other end abuts against the thread take-up portion 230. Additionally, the compression spring 281 may be arranged between the first limiting portion 260 and the first connection block 231. Thus, when the thread take-up portion 230 is driven upward, the compression spring 281 is compressed. When the thread take-up portion 230 is not being driven, the thread take-up portion 230 is driven downward by the extension of the compression spring 281, and thus is reset. Additionally, the reset portion 280 may further include a tension spring 282. One end of the tension spring 282 is connected to the base 210, and the other end is connected to the thread take-up portion 230. When the thread take-up portion 230 is not being driven, the tension spring 282 is in a stretched state, pulls the thread take-up portion 230 and abuts against the second limiting portion 270. When the thread take-up portion 230 is driven upward, the tension spring 282 is further stretched. When the thread take-up portion 230 is not being driven, the thread take-up portion 230 is driven downward by the contraction of the tension spring 282, and thus is reset.

[0043] Figure 4 is a perspective view of the thread take-up mechanism 200b; Figure 5 is a partial cross-sectional view of the thread take-up mechanism 200b, referring to Figure 4 、 Figure 5, in some embodiments, to simplify the limiting structure of the thread take-up part 230, a third limiting member 211 is further included. The third limiting member 211 is installed on the base 210. The first connecting block 231 is provided with a third groove portion 233. The third groove portion 233 is adapted to the third limiting member 211. The third limiting member 211 is inserted into the third groove portion 233 to limit the stroke of the first connecting block 231 being driven. Thus, the stroke of the thread take-up part 230 sliding in the up and down direction can be limited, and the structure is compact. Specifically, a guide hole serving as the first guiding portion 220 is provided on the base 210. The first connecting block 231 of the thread take-up part 230 can be arranged in a shaft shape adapted to the guide hole of the first guiding portion 220. The third groove portion 233 penetrates the first connecting block 231 and extends along the axial direction of the first connecting block 231. The third limiting member 211 is in a shaft shape. The third limiting member 211 passes through the third groove portion 233, and both ends of the third limiting member 211 are supported on the base 210. Thus, the third limiting member 211 can not only limit the stroke of the thread take-up part 230 sliding up and down, but also prevent the thread take-up part 230 from rotating in the guide hole. The structure is compact and easy to implement.

[0044] For each of the specific technical features described in the above specific embodiments, they can be combined in any way without contradiction. For the sake of unnecessary repetition, the present invention does not separately describe various possible combination manners.

[0045] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Any modification or equivalent replacement that does not depart from the scope of the present invention shall be included in the technical solutions of the present invention.

Claims

1. Thread take-up mechanism for the silk thread assembly of the lens mount, wherein, The lens suspension includes a shrapnel and a silk thread, and the silk thread is press-fitted by a driving device and thus fixed to the shrapnel. It is characterized in that the thread picking mechanism has a base, a first guiding portion is provided on the base, the first guiding portion guides in a straight line direction along the driving direction of the driving device, a thread picking portion is provided on the first guiding portion, and the thread picking portion is arranged to be driven along the guiding direction of the first guiding portion to bend the silk thread when the silk thread is pulled to a preset installation position on the shrapnel. The thread picking portion includes a first connecting block, the first connecting block is mounted on the first guiding portion, and a first groove portion is provided on the upper portion of the first connecting block; The thread picking mechanism further includes: a connecting rod portion, the connecting rod portion is mounted on the base as a transfer device, the connecting rod portion has a connecting rod member, the connecting rod member is provided with a hinge hole, a hinge shaft is provided on the base, and the connecting rod member is mounted on the base through the hinge of the hinge hole and the hinge shaft; one end of the connecting rod portion extends into the first groove portion and abuts against the upper side of the first groove portion, and the other end of the connecting rod portion can be driven by the driving device to drive the thread picking portion and bend the silk thread; a second guiding portion, the second guiding portion is mounted on the base, the second guiding portion is parallel to the first guiding portion, a driving transfer block is mounted on the second guiding portion, the driving transfer block is provided with a second groove portion, the other end of the connecting rod portion extends into the second groove portion and abuts against the upper side of the second groove portion, and the driving device swings the end of the connecting rod portion connected to the driving transfer block and swings the other end of the connecting rod portion connected to drive the thread picking portion in the opposite direction; Moreover, when the other end of the connecting rod portion swings in the opposite direction, the thread picking portion is pushed by the other end of the connecting rod portion and slides along the guiding direction of the first guiding portion.

2. The thread take-up mechanism according to claim 1, characterized in that, The thread picking portion includes a thread picking piece, and the thread picking piece is mounted on the first connecting block.

3. The thread take-up mechanism according to claim 1, wherein It further includes a first limiting portion, the first limiting portion is mounted on the base and limits the driving stroke of the thread picking portion towards the silk thread.

4. The thread take-up mechanism according to claim 3, characterized in that, The first limiting portion has a micrometer head, and the micrometer head adjusts and limits the driving stroke of the thread picking portion towards the silk thread.

5. The thread take-up mechanism according to claim 1 or 2, characterized in that It further includes a second limiting portion, the second limiting portion is mounted on the base and limits the driving stroke of the thread picking portion in the direction away from the silk thread.

6. The thread take-up mechanism according to claim 5, characterized in that, It further includes a resetting portion, one end of the resetting portion is connected to the base, the other end is connected to the thread picking portion, and drives the thread picking portion to abut against the second limiting portion.

7. The thread take-up mechanism according to claim 6, characterized in that, The resetting portion includes a compression spring with one end abutting against the base and the other end abutting against the thread picking portion, and / or a tension spring with one end connected to the base and the other end connected to the thread picking portion.

8. The thread take-up mechanism according to claim 2, wherein It further includes a third limiting member, the third limiting member is mounted on the base, the first connecting block is provided with a third groove portion, the third groove portion is adapted to the third limiting member, and the third limiting member is inserted into the third groove portion to limit the driving stroke of the first connecting block.

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