Thread trimming mechanism of multi-needle machine

Abstract

The utility model provides a thread trimming mechanism of a multi-needle machine, and belongs to the technical field of multi-needle machines. The thread trimming mechanism solves the problem that a movable knife rest in the thread trimming mechanism moves unstably. The thread trimming mechanism of the multi-needle machine comprises a machine base and a movable knife rest movably arranged on the machine base, a sliding guide assembly is connected to the machine base, at least one end of the movable knife rest is provided with a guide rod, a sliding groove for the guide rod to slide is formed in the machine base, and the thread trimming mechanism further comprises a connecting strip arranged in the transverse direction. The end, away from the movable knife rest, of the guide rod is connected with the sliding guide assembly through a connecting strip which is fixedly connected with the guide rod and drives the guide rod to slide along the machine base. According to the thread trimming mechanism of the multi-needle machine, shaking generated in the middle of the movable knife rest when the movable knife rest moves is reduced, and the moving stability of the movable knife rest is further improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of multi-needle machines and relates to a thread trimming mechanism of the multi-needle machine. Background Art

[0002] As people's requirements for sewing gradually increase, multi-needle sewing machines are generally used in industrial sewing to improve sewing efficiency. Multi-needle sewing machines usually use 3-needle, 4-needle, 6-needle, 9-needle, 12-needle, 16-needle, 21-needle, 24-needle, 25-needle, 33-needle, 38-needle, and 50-needle sewing machines. The thread trimming device of a general multi-needle machine has a moving knife and a fixed knife. At the end of sewing, the moving knife is driven by the moving knife to make the moving knife move tangent to the fixed knife, and the upper thread and lower thread extending from the processed cloth are automatically cut off. During the thread trimming process, the moving knife holder needs to move toward the machine base to achieve thread trimming.

[0003] For example, Chinese patent application [Authorization Announcement No.: CN217149550U] discloses a multi-needle machine thread trimmer disc reset device, which is used in conjunction with the multi-needle machine and includes a base, a moving knife mechanism and a control mechanism. The moving knife mechanism includes a moving knife holder, a moving knife and a moving knife drive unit, the moving knife is connected to the moving knife holder, the moving knife holder is slidably connected to the base, the moving knife drive unit is used to drive the moving knife holder to reciprocate axially to drive the moving knife to reciprocate axially, the control mechanism includes a magnet connected to the moving knife holder, a Hall sensor connected to the base and a control module, the Hall sensor is arranged corresponding to the magnet, the control module is communicatively connected to the Hall sensor, and is controlled to be connected to the moving knife drive unit, the control module is used to receive the signal of the Hall sensor, and control the operation of the moving knife drive unit according to the signal of the Hall sensor to drive the moving knife to reset.

[0004] The above structure drives the movable knife holder to move by the control mechanism, thereby realizing the resetting and movement of the movable knife holder. However, when the existing sewing machine controls the movement of the movable knife holder, since a plurality of movable knives are connected to the middle part of the movable knife holder, the middle part of the movable knife holder is subjected to greater force when it moves, and the two sides of the movable knife holder are arranged longer and connected to the base. The movable knife holder is only driven by the movable knife driving part when it moves, and it is easy to be displaced in the left and right directions when it moves, affecting the stability of the movement of the movable knife holder. Therefore, in order to ensure the stability of the movement, the installation positions of the two ends of the movable knife holder require higher symmetry accuracy, which makes the installation of the movable knife holder difficult and is prone to deviation after installation, so that the movable knife holder is offset when it moves, affecting the working stability of the movable knife holder. Utility Model Content

[0005] The utility model aims at the above problems in the prior art and proposes a thread trimming mechanism for a multi-needle machine. The technical problem to be solved by the utility model is: how to solve the problem of unstable movement of the movable knife holder in the prior thread trimming mechanism.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A thread trimming mechanism of a multi-needle machine comprises a machine base and a movable knife frame movably arranged on the machine base, a sliding guide assembly being connected to the machine base, and is characterized in that a guide rod is provided on at least one end of the movable knife frame, a slide groove for sliding the guide rod is provided on the machine base, and the thread trimming mechanism also comprises a connecting strip arranged in a transverse direction, an end of the guide rod away from the movable knife frame is connected to the sliding guide assembly via the connecting strip, and the connecting strip is fixedly connected to the guide rod and drives the guide rod to slide along the machine base.

[0008] The existing movable tool holder slides along the machine base through the sliding guide assembly during operation. The existing technology is to directly connect the two ends of the movable tool holder with the sliding guide assembly, and the movement of the sliding guide assembly directly drives the movable tool holder to move. However, since the movable tool holder has strict requirements on the movement trajectory of the movable tool holder when it moves, in order to improve the stability of the movement of the movable tool holder and the convenience of installation, a guide rod is provided at at least one end of the movable tool holder, and the movable tool holder is connected to the sliding guide assembly through the guide rod and a connecting strip. When the sliding guide assembly slides, the guide rod is driven to slide through the connecting strip, so that the movable tool holder moves through the guide rod. The guiding improves the stability of the movement of the movable tool holder, and by opening a slide groove on the machine base, the guiding of the movement of the movable tool holder is achieved through the setting of the guide rod and the slide groove, and the connection strip is made so that the distance between the guide rod and the moving knife mounting part of the movable tool holder is closer, and the gravity at the moving knife mounting part of the movable tool holder is the largest, and the closer the movable tool holder is connected to the machine base in the middle, the faster the inertia force of the movable tool holder can be transmitted to the machine base when it moves. Since the machine base is fixed, it has higher stability, which helps to reduce the shaking of the middle part of the movable tool holder when the movable tool holder moves, and further improves the stability of the movement of the movable tool holder.

[0009] Due to the lateral arrangement of the connecting strip, the distance between the guide rod and the sliding guide assembly can be adjusted through the connecting strip, and since the force transmission path is shorter, the displacement deviation of the movable tool holder is reduced.

[0010] In the thread trimming mechanism of the multi-needle machine, the side wall of the guide rod is close to the groove wall of the slide groove, and the slide groove also has a limiting wall for the end of the guide rod away from the movable knife holder to abut.

[0011] The guide rod is close to the groove wall of the slide groove, so that the slide groove does not affect the movement speed of the guide rod and can also achieve a pre-guiding effect on the guide rod. In addition, through the setting of the limiting wall, the movement stroke of the guide rod can be limited, avoiding the transition of the movable knife holder movement and limiting the travel of the movable knife holder, thereby improving the stability of the thread cutting mechanism.

[0012] In the thread trimming mechanism of the above-mentioned multi-needle machine, the limiting wall has a limiting opening that is recessed outward along the longitudinal direction, the end of the guide rod away from the movable knife holder is embedded in the limiting opening, and the outer side walls of the guide rod are in contact with the mouth wall of the limiting opening.

[0013] The setting of the limiting part ensures that when the guide rod slides away from one end of the movable knife holder into the clearance opening, it can be further guided by the clearance opening, thereby improving the guiding effect of the guide rod, and the mouth wall of the limiting opening fits with the outer side wall of the guide rod, thereby improving the buffering of the stroke limitation of the movable knife holder, so that the impact force is smaller when they abut against each other, thereby further improving the stability of the thread cutting mechanism.

[0014] In the thread trimming mechanism of the above-mentioned multi-needle machine, the machine base extends toward the moving knife direction of the moving knife holder to form a guide mounting portion, the slide groove is opened on the guide mounting portion, the connecting strip is located below the slide groove and the limit opening, and there is a clearance between the upper end surface of the connecting strip and the lower end surface of the guide mounting portion.

[0015] By setting the guide installation part, the guide installation part extends toward the moving knife of the moving knife holder, so that the distance between the moving knife on the moving knife holder and the machine base is closer, and the gravity at the moving knife installation point of the moving knife holder is the largest. The closer the moving knife holder is connected to the machine base in the middle, the faster the inertia force of the moving knife holder can be transmitted to the machine base when it moves. The connecting strip is located at the bottom and has a clearance between it and the guide installation part, so that the setting of the connecting strip does not affect the sliding of the guide rod and the slide rail, reduces the sliding resistance, and further improves the stability of the movement of the moving knife holder.

[0016] In the thread trimming mechanism of the above-mentioned multi-needle machine, the sliding guide assembly includes a connecting guide block fixedly connected to the machine base and a slide rail arranged one-to-one with the connecting guide block, the slide rail slides along the connecting guide block, one end of the connecting strip is fixedly connected to the slide rail, and the guide rod is arranged parallel to the slide rail.

[0017] The slide rail slides along the connecting guide block, which increases the stability of the movable tool holder. The guide rod is arranged parallel to the slide rail so that the moving direction of the guide rod is the same as that of the slide rail, thereby reducing the sliding resistance and improving the stability of the movable tool holder.

[0018] One end of the slide rail is connected to a drive motor, which can push the slide rail to move and enable the slide rail to drive the guide rod to move synchronously. Through the dual guidance of the slide rail and the guide rod, the movement of the movable tool holder is more stable.

[0019] In the thread trimming mechanism of the multi-needle machine described above, both ends of the connecting strip are strip-shaped mounting portions, and the mounting portions are arranged along the length direction of the slide rail or the guide rod and are fixedly connected thereto.

[0020] The arrangement of the mounting portion makes the connection between the connecting strip and the slide rail and the guide rod more stable, thereby improving the stability of the movement of the movable tool holder.

[0021] In the above-mentioned thread trimming mechanism of the multi-needle machine, the guide mounting part is provided with a guide block, the side wall on one side of the guide rod can be close to the side wall on one side of the guide block, and the guide block is located on the side close to the slide rail, and the side wall on one side of the slide rail can also be close to the side wall on the other side of the guide block.

[0022] The guide block is provided to directly separate the slide rail from the guide rod, and both the slide rail and the guide rod can be guided by the side wall of the guide block, which not only guides the slide rail and the guide rod but also reduces the setting space.

[0023] In the thread trimming mechanism of the above-mentioned multi-needle machine, the guide mounting portion is also connected to a mounting cross bar installed under the moving tool holder, and one end of the guide rod has a limiting step, which can abut against the side wall of the mounting cross bar and prevent the guide rod from sliding outward.

[0024] The setting of installing the cross bar can, on the one hand, limit the movable knife holder in the up and down directions, and on the other hand, further control the stroke of the guide rod through the setting of the limit step, thereby improving the stability of the thread trimming mechanism.

[0025] In the thread trimming mechanism of the multi-needle machine described above, the sliding guide assembly includes a guide bar fixedly connected to the machine base, a slider is connected to the connecting bar, and the slider is slidably connected to the guide bar.

[0026] By directly arranging a guide bar on the machine base, the connecting bar is slidably connected to the guide bar through a slider, and specifically, a driving cylinder for driving the connecting block to slide can be arranged on the machine base, thereby achieving stable movement of the movable tool holder.

[0027] Compared with the prior art, the thread trimming mechanism of the multi-needle machine has the following advantages:

[0028] 1. By opening a slide groove on the guide mounting portion, and by setting the guide rod and the guide mounting portion, the movement of the movable tool holder is guided, and the guide mounting portion extends toward the moving knife direction of the movable tool holder, so that the distance between the moving knife on the movable tool holder and the machine base is closer, and the gravity at the moving knife installation point of the movable tool holder is the largest. The closer the movable tool holder is connected to the machine base in the middle, the faster the inertia force of the movable tool holder can be transmitted to the machine base when it moves. Since the machine base is fixed, it has higher stability, which helps to reduce the shaking of the middle part of the movable tool holder when the movable tool holder moves, and further improves the stability of the movement of the movable tool holder.

[0029] 2. The setting of the connecting strip avoids interference between the guide rod and the slide rail when they slide. The setting of the connecting strip facilitates the setting of the guide rod and enables the guide installation part to be closer to the moving knife of the moving knife holder, which further facilitates the installation and makes the thread trimming mechanism run stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of the thread trimming mechanism of the multi-needle machine after assembly.

[0031] Figure 2 This is one of the partial structural diagrams of the thread trimming mechanism of the multi-needle machine.

[0032] Figure 3 This is the second partial structural diagram of the thread trimming mechanism of the multi-needle machine.

[0033] Figure 4 This is a bottom view of a portion of the structure of the thread trimming mechanism of the multi-needle machine.

[0034] Figure 5 is along Figure 4 Sectional view of AA.

[0035] Figure 6 This is an exploded view of the thread trimming mechanism of this multi-needle machine.

[0036] Figure 7 It is a structural diagram of the second embodiment.

[0037] In the figure, 1, machine base; 12, guide mounting part; 12a, slide groove; 12a1, limit wall; 12a2, limit opening; 12b, guide block; 2, moving tool holder; 3, sliding guide assembly; 31, connecting guide block; 32, slide rail; 33, guide strip; 4, guide rod; 41, limit step; 5, connecting strip; 51, mounting part; 52, slider; 6, mounting cross bar; 7, connecting rod. DETAILED DESCRIPTION

[0038] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0039] Embodiment 1

[0040] like Figure 1 As shown, the thread trimming mechanism of the multi-needle machine includes a machine base 1 and a movable knife holder 2 movably arranged on the machine base 1, and a sliding guide assembly 3 is connected to the machine base 1.

[0041] Specifically, Figure 1-6As shown, at least one end of the movable knife holder 2 has a guide rod 4 arranged parallel to the slide rail 32, the machine base 1 extends toward the movable knife direction of the movable knife holder 2 to form a guide mounting portion 12, and the guide mounting portion 12 is provided with a slide groove 12a for the guide rod 4 to slide. The thread cutting mechanism also includes a connecting strip 5 arranged in the transverse direction, and the end of the guide rod 4 away from the movable knife holder 2 is connected to the sliding guide assembly 3 through the connecting strip 5, the connecting strip 5 is fixedly connected to the guide rod 4 and drives the guide rod 4 to slide along the machine base 1, and the sliding guide assembly 3 includes a connecting guide block 31 fixedly connected to the machine base 1 and a slide rail 32 arranged one by one with the connecting guide block 31, the slide rail 32 slides along the connecting guide block 31, one end of the connecting strip 5 is fixedly connected to the slide rail 32, and the guide rod 4 is arranged parallel to the slide rail 32.

[0042] The existing movable tool holder 2 slides along the connecting guide block 11 through the slide rail 32 during operation. The existing technology is to directly connect the two ends of the movable tool holder 2 with the slide rail 32, and the movement of the slide rail 32 directly drives the movable tool holder 2 to move. However, since the movable tool holder 2 has strict requirements on the movement trajectory of the movable tool holder 2 when it moves, in order to improve the stability of the movement of the movable tool holder 2 and the convenience of installation, a guide installation part 12 is extended on the machine base 1 in the direction in which the movable tool holder 2 is set. Guide rods 4 are connected to the two ends of the movable tool holder 2, and the guide rods 4 are arranged parallel to the slide rail 32. The movable tool holder 2 is connected to the slide rail 32 through the guide rod 4 and the connecting bar 5. When the slide rail 32 slides, it drives the guide rod 4 to move. Slide toward the rod 4, and a slide groove 12a is opened on the guide mounting part 12. Through the arrangement of the guide rod 4 and the guide mounting part 12, the movement of the movable tool holder 2 is guided, and the guide mounting part 12 extends toward the moving knife direction of the movable tool holder 2, so that the distance between the moving knife on the movable tool holder 2 and the machine base 1 is closer, and the gravity at the moving knife installation point of the movable tool holder 2 is the largest. The closer the movable tool holder 2 is connected to the machine base 1 in the middle, the faster the inertia force of the movable tool holder 2 can be transmitted to the machine base 1 when it moves. Since the machine base 1 is fixed, it has higher stability, which helps to reduce the shaking of the middle part of the movable tool holder 2 when the movable tool holder 2 moves, and further improves the stability of the movement of the movable tool holder 2.

[0043] Due to the lateral arrangement of the connecting strip 5 , the distance between the guide rod 4 and the slide rail 32 can be adjusted through the connecting strip 5 , and since the force transmission path is shorter, the displacement deviation of the movable tool holder 2 is reduced.

[0044] In this embodiment, if Figure 3 and Figure 4As shown, one end of the movable tool holder 2 is connected to a guide rod 4, and the other end is connected to a connecting rod 7 connected to the end of another slide rail 32. The lower end of the guide mounting portion 12 on the above-mentioned machine base 1 can be used for the installation and sliding of the guide rod 4, and the upper end of the guide mounting portion 12 can be used for the installation of other components of the multi-needle machine, thereby providing a small amount of installation space for other components, further improving the integration of the multi-needle machine.

[0045] like Figure 3 and Figure 6 As shown, the side wall of one side of the guide rod 4 is close to the groove wall of the slide groove 12a, and the slide groove 12a also has a limiting wall 12a1 for the end of the guide rod 4 away from the movable tool holder 2 to abut against.

[0046] like Figure 3-6 As shown, the limiting wall 12a1 has a limiting opening 12a2 which is recessed outward along the longitudinal direction, and the end of the guide rod 4 away from the movable tool holder 2 is embedded in the limiting opening 12a2, and the outer side walls of the guide rod 4 are both in contact with the opening walls of the limiting opening 12a2, the connecting strip 5 is located below the slide groove 12a and the limiting opening 12a2, and there is a clearance between the upper end surface of the connecting strip 5 and the lower end surface of the guide mounting portion 12, and both ends of the connecting strip 5 are strip-shaped mounting portions 51, and the mounting portions 51 are arranged along the length direction of the slide rail 32 or the guide rod 4 and are fixedly connected thereto.

[0047] like Figure 3 and Figure 6 As shown, the guide mounting portion 12 is provided with a guide block 12b, the side wall on one side of the guide rod 4 can be close to the side wall on one side of the guide block 12b, and the guide block 12b is located on the side close to the slide rail 32, and the side wall on one side of the slide rail 32 can also be close to the side wall on the other side of the guide block 12b, and the guide mounting portion 12 is also connected to a mounting cross bar 6 installed under the movable tool holder 2, and one end of the guide rod 4 has a limiting step 41, which can abut against the side wall of the mounting cross bar 6 and prevent the guide rod 4 from sliding outward.

[0048] Embodiment 2

[0049] The content of this embodiment is basically the same as that of the first embodiment, except that: Figure 7 As shown, the sliding guide assembly 3 includes a guide bar 33 fixedly connected to the base 1 , a slider 52 is connected to the connecting bar 5 , and the slider 52 is slidably connected to the guide bar 33 .

[0050] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A thread trimming mechanism for a multi-needle machine, comprising a machine base (1) and a movable knife holder (2) movably arranged on the machine base (1), wherein a sliding guide assembly (3) is connected to the machine base (1), characterized in that: The movable blade holder (2) has a guide rod (4) on at least one end, and the machine base (1) is provided with a slide groove (12a) for the guide rod (4) to slide. The thread trimming mechanism also includes a connecting strip (5) arranged in a transverse direction, and the end of the guide rod (4) away from the movable blade holder (2) is connected to the sliding guide assembly (3) through the connecting strip (5), and the connecting strip (5) is fixedly connected to the guide rod (4) and drives the guide rod (4) to slide along the machine base (1).

2. The thread trimming mechanism of the multi-needle machine according to claim 1, characterized in that: The side wall of one side of the guide rod (4) is close to the groove wall of the slide groove (12a), and the slide groove (12a) also has a limiting wall (12a1) for the end of the guide rod (4) away from the movable tool holder (2) to abut against.

3. The thread trimming mechanism of the multi-needle machine according to claim 2, characterized in that: The limiting wall (12a1) has a limiting opening (12a2) that is recessed outward in the longitudinal direction, and one end of the guide rod (4) away from the movable tool holder (2) is embedded in the limiting opening (12a2), and the outer side walls of the guide rod (4) are both in contact with the opening wall of the limiting opening (12a2).

4. The thread trimming mechanism of the multi-needle machine according to claim 3, characterized in that: The machine base (1) extends in the direction of the moving knife of the moving knife holder (2) to form a guide mounting portion (12), the slide groove (12a) is provided on the guide mounting portion (12), the connecting strip (5) is located below the slide groove (12a) and the limiting opening (12a2), and a clearance is provided between the upper end surface of the connecting strip (5) and the lower end surface of the guide mounting portion (12).

5. The thread trimming mechanism of the multi-needle machine according to claim 4, characterized in that: The sliding guide assembly (3) comprises a connecting guide block (31) fixedly connected to the machine base (1) and a slide rail (32) arranged in a one-to-one correspondence with the connecting guide block (31); the slide rail (32) slides along the connecting guide block (31); one end of the connecting bar (5) is fixedly connected to the slide rail (32); and the guide rod (4) is arranged parallel to the slide rail (32).

6. The thread trimming mechanism of the multi-needle machine according to claim 5, characterized in that: Both ends of the connecting strip (5) are strip-shaped mounting portions (51), and the mounting portions (51) are arranged along the length direction of the slide rail (32) or the guide rod (4) and are fixedly connected thereto.

7. The thread trimming mechanism of the multi-needle machine according to claim 5, characterized in that: The guide mounting portion (12) is provided with a guide block (12b), the side wall on one side of the guide rod (4) can be close to the side wall on one side of the guide block (12b), and the guide block (12b) is located on a side close to the slide rail (32), and the side wall on one side of the slide rail (32) can also be close to the side wall on the other side of the guide block (12b).

8. The thread trimming mechanism of the multi-needle machine according to claim 4 or 5, characterized in that: The guide mounting portion (12) is also connected to a mounting cross bar (6) mounted below the movable tool holder (2); one end of the guide rod (4) has a limiting step (41); the limiting step (41) can abut against a side wall of the mounting cross bar (6) and prevent the guide rod (4) from sliding outward.

9. The thread trimming mechanism of a multi-needle machine according to any one of claims 1 to 4, characterized in that: The sliding guide assembly (3) comprises a guide bar (33) fixedly connected to the machine base (1); a sliding block (52) is connected to the connecting bar (5); and the sliding block (52) is slidably connected to the guide bar (33).

Images