Thread trimming mechanism for a cylinder sewing machine

Abstract

The utility model provides a kind of thread trimming mechanism of barrel sewing machine, belong to barrel sewing machine technical field.It solves the problem of existing thread trimming mechanism complex structure, and inconvenient installation.This barrel sewing machine includes the cabinet with long arm, thread trimming mechanism is arranged in long arm in thread trimming shaft and is set in the drive source, main shaft and driving piece in the tail end of cabinet, cam is fixedly connected on main shaft, one side of driving piece is equipped with roller, the middle part of driving piece is hinged with cabinet, one end of driving piece is connected with cabinet or drive source by tension spring, the other end of driving piece is movably connected with the tail end of thread trimming shaft, roller has spacing between cam under the action of tension spring tension, drive source can overcome the tension of tension spring and drive driving piece rotation to make roller abut on the outer peripheral wall of cam, main shaft drive cam rotation can make driving piece swing by roller and then drive thread trimming shaft rotation.The thread trimming mechanism of this barrel sewing machine has the advantage that space is reasonably utilized, and thread trimming mechanism is arranged reasonably.

Description

Technical Field

[0001] This utility model belongs to the technical field of tube sewing machines and relates to a thread-cutting mechanism for tube sewing machines. Background Technology

[0002] A sewing machine is a mechanical device that uses one or more sewing threads to create specific stitches on materials (such as fabrics, leather, etc.), allowing one or more layers of material to interweave or sew together. Sewing machines include tube sewing machines, which include a thread-cutting mechanism that can cut the thread after sewing is completed.

[0003] Existing thread-cutting mechanisms for long-arm tube sewing machines, such as the thread-cutting mechanism for tube sewing machines disclosed in Chinese patent literature [Patent No.: 202020387411.1; Application Publication No.: CN212000161U], include a cylinder, a thread-cutting drive shaft, a lower shaft, a roller pusher frame, rollers, a cam, a rotary hook mounting frame, a moving cutter shaft connecting crank, a moving cutter mounting seat, a moving cutter, a moving cutter connecting frame, a fixed cutter seat, and a fixed cutter. The cylinder pushes the roller pusher frame, causing the thread-cutting drive shaft to move the moving cutter connecting frame forward, while simultaneously moving the moving cutter shaft connecting crank, thus moving the moving cutter.

[0004] This type of thread-cutting mechanism uses a cylinder to drive a roller pusher, which in turn causes the thread-cutting drive shaft to move the moving blade connecting frame forward. Simultaneously, this drives the crank connected to the moving blade shaft, which in turn moves the moving blade towards the fixed blade, thus completing the thread cutting. This type of tubular sewing machine includes a housing with a long arm. The thread-cutting mechanism has numerous components, all concentrated within the long arm. However, the limited space inside the long arm results in a complex structure and inconvenient installation for this type of thread-cutting mechanism. Summary of the Invention

[0005] The purpose of this utility model is to address the aforementioned problems in the existing technology by proposing a thread-cutting mechanism for a tube sewing machine. The technical problem to be solved is how to make reasonable use of space and arrange the thread-cutting mechanism in a reasonable manner.

[0006] The objective of this utility model can be achieved through the following technical solution: a thread-cutting mechanism for a tubular sewing machine, the tubular sewing machine including a machine housing with a long arm, the thread-cutting mechanism including a fixed blade fixed to the first end of the long arm, a thread-cutting shaft passing through the long arm, and a movable blade fixed to the first end of the thread-cutting shaft and cooperating with the fixed blade, characterized in that the thread-cutting mechanism further includes a drive source, a main shaft, and a drive plate disposed at the tail end of the machine housing, a cam fixedly connected to the main shaft, a roller provided on one side of the drive plate, the middle part of the drive plate being hinged to the machine housing, one end of the drive plate being connected to the machine housing or the drive source through a tension spring, the other end of the drive plate being movably connected to the tail end of the thread-cutting shaft, the roller having a gap with the cam under the tension of the tension spring, the drive source being able to overcome the tension of the tension spring to drive the drive plate to rotate so that the roller abuts against the outer peripheral wall of the cam, the main shaft driving the cam to rotate can cause the drive plate to swing through the roller and drive the thread-cutting shaft to rotate.

[0007] When not cutting the thread, the roller maintains a gap with the cam under the tension of the spring, meaning the roller does not contact the cam, and the rotation of the cam does not cause the thread-cutting shaft to rotate. When cutting the thread, the drive source overcomes the tension of the spring, causing the drive plate to rotate, thus causing the roller to press against the outer wall of the cam. The main shaft drives the cam to rotate, thereby changing the position of the roller. This change in roller position causes the drive plate to oscillate, which in turn causes the thread-cutting shaft to rotate. The rotation of the thread-cutting shaft drives the moving blade to rotate, and the rotating blade engages with the fixed blade to cut the thread. The long arm is cylindrical with limited internal space. This thread-cutting mechanism only places the thread-cutting shaft within the long arm, while the drive source, main shaft, and drive plate are located at the tail end of the machine housing. This efficient use of the internal space of the tubular sewing machine results in a rational arrangement of the thread-cutting mechanism.

[0008] In the thread-cutting mechanism of the aforementioned tubular sewing machine, a roller is fixedly connected to the tail end of the thread-cutting shaft. The roller is eccentrically positioned relative to the thread-cutting shaft. The other end of the drive plate has an elongated groove, in which the roller is embedded and can move relative to the groove wall, allowing the other end of the drive plate to be movably connected to the tail end of the thread-cutting shaft. This structure allows the oscillation of the drive plate to be converted into the rotation of the thread-cutting shaft, resulting in a simple structure.

[0009] In the thread-cutting mechanism of the aforementioned tubular sewing machine, a clamping ring is fixedly connected to the tail end of the thread-cutting shaft, and the roller is fixedly connected to the clamping ring. The axial direction of the roller is parallel to the axial direction of the thread-cutting shaft. This structure allows the roller to be eccentrically positioned relative to the thread-cutting shaft, resulting in a simple structure.

[0010] In the thread-cutting mechanism of the aforementioned tubular sewing machine, the drive source is located directly below the drive plate. One end of the drive plate has a downwardly protruding flange. The output shaft of the drive source extends and pushes against the flange, causing the drive plate to rotate. The flange ensures the strength at the contact point between the drive plate and the output shaft and also reduces the extension amount of the output shaft.

[0011] In the thread-cutting mechanism of the aforementioned tube sewing machine, the drive plate is bent at its hinge point. This structure allows the drive plate to swing smoothly.

[0012] In the thread-cutting mechanism of the aforementioned tube sewing machine, the width of the other end of the drive plate is greater than the width of the first end. This structure gives the other end of the drive plate higher strength, ensuring that it is not easily damaged when the drive plate drives the thread-cutting shaft to rotate, thus improving its service life.

[0013] In the thread-cutting mechanism of the aforementioned tube sewing machine, the driving source is a cylinder or an electromagnet.

[0014] In the thread-cutting mechanism of the aforementioned tubular sewing machine, a crank is fixedly connected to the first end of the thread-cutting shaft, and the moving blade is fixedly connected to the crank. The moving blade is annular in shape.

[0015] Compared with the prior art, the long arm of the tubular sewing machine provided by this utility model is long and cylindrical with a small internal space. The thread cutting mechanism only sets the thread cutting shaft in the long arm, while the drive source, main shaft and drive plate are set in the tail end of the machine housing. This makes reasonable use of the internal space of the tubular sewing machine and makes the thread cutting mechanism more reasonable. Attached Figure Description

[0016] Figure 1 This is a schematic diagram showing the location of the wire-cutting mechanism.

[0017] Figure 2 This is a schematic diagram of the overall structure of the wire-cutting mechanism.

[0018] Figure 3 This is a schematic diagram of the structure between the main shaft and the wire-cutting shaft of this wire-cutting mechanism.

[0019] In the diagram, 1 is the housing; 1a is the long arm; 2 is the fixed blade; 3 is the wire cutting shaft; 4 is the moving blade; 5 is the drive source; 6 is the main shaft; 7 is the drive plate; 71 is the slide groove; 72 is the raised edge; 8 is the cam; 9 is the roller; 10 is the tension spring; 11 is the roller; 12 is the clamping ring; and 13 is the crank. Detailed Implementation

[0020] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0021] like Figure 1 , Figure 2 As shown, the tube sewing machine includes a housing 1 with a long arm 1a and a thread-cutting mechanism. The thread-cutting mechanism includes a fixed blade 2, a thread-cutting shaft 3, a moving blade 4, a drive source 5, a main shaft 6, a drive plate 7, a cam 8, a roller 9, a tension spring 10, a roller 11, a clamping ring 12, and a crank 13. The drive source 5, main shaft 6, drive plate 7, cam 8, roller 9, tension spring 10, roller 11, and clamping ring 12 are all located at the tail end of the housing 1.

[0022] The fixed blade 2 is fixedly connected to the head end of the long arm 1a, the wire cutting shaft 3 is inserted through the long arm 1a, the head end of the wire cutting shaft 3 is fixedly connected to the crank 13, the moving blade 4 is ring-shaped, the moving blade 4 is fixedly connected to the crank 13, and the moving blade 4 cooperates with the fixed blade 2.

[0023] In this embodiment, the middle part of the drive plate 7 is hinged to the housing 1, one end of the drive plate 7 is connected to the drive source 5 through the tension spring 10, and the other end of the drive plate 7 is movably connected to the tail end of the wire cutting shaft 3. For example, Figure 3 As shown, the clamping ring 12 is fixed to the tail end of the wire cutting shaft 3, and the roller 11 is fixed to the clamping ring 12. The axial direction of the roller 11 is parallel to the axial direction of the wire cutting shaft 3. The roller 11 is eccentrically positioned relative to the wire cutting shaft 3. The other end of the drive plate 7 has a long, narrow groove 71. The roller 11 is embedded in the groove 71 and can move relative to the groove wall of the groove 71, so that the other end of the drive plate 7 is movably connected to the tail end of the wire cutting shaft 3. In actual production, one end of the drive plate 7 is connected to the housing 1 through a tension spring 10. The drive plate 7 is bent, and the drive plate 7 is bent at its hinge point. The width of the other end of the drive plate 7 is greater than the width of one end of the drive plate 7.

[0024] The drive source 5 is located directly below the drive plate 7, and one end of the drive plate 7 has a downwardly protruding flange 72. In this embodiment, the drive source 5 is a cylinder; in actual production, the drive source 5 is an electromagnet.

[0025] A cam 8 is fixedly connected to the main shaft 6. A roller 9 is provided on one side of the drive plate 7. When not cutting the thread, the roller 9 has a gap with the cam 8 under the tension of the tension spring 10, that is, the roller 9 does not contact the cam 8. When cutting the thread, the output shaft of the drive source 5 extends to overcome the tension of the tension spring 10 and pushes up the protrusion 72, causing the drive plate 7 to rotate, so that the roller 9 abuts against the outer peripheral wall of the cam 8. The main shaft 6 drives the cam 8 to rotate, thereby changing the position of the roller 9. The change in the position of the roller 9 causes the drive plate 7 to swing, causing the roller 11 to move along the slide groove 71. The swing of the drive plate 7 causes the thread cutting shaft 3 to rotate. The rotation of the thread cutting shaft 3 drives the moving blade 4 to rotate. The rotating moving blade 4 engages with the fixed blade 2, thereby cutting the thread.

[0026] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0027] Although this document frequently uses terms such as housing 1, long arm 1a, fixed blade 2, wire cutting shaft 3, moving blade 4, drive source 5, main shaft 6, drive plate 7, slide groove 71, raised edge 72, cam 8, roller 9, tension spring 10, roller 11, clamping ring 12, and crank 13, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A thread-cutting mechanism for a tubular sewing machine, the tubular sewing machine comprising a housing (1) having a long arm (1a), the thread-cutting mechanism comprising a fixed blade (2) fixedly connected to the head end of the long arm (1a), a thread-cutting shaft (3) passing through the long arm (1a), and a movable blade (4) fixedly connected to the head end of the thread-cutting shaft (3) and cooperating with the fixed blade (2), characterized in that, The wire cutting mechanism also includes a drive source (5), a main shaft (6), and a drive plate (7) disposed at the tail end of the housing (1). A cam (8) is fixedly connected to the main shaft (6). A roller (9) is provided on one side of the drive plate (7). The middle part of the drive plate (7) is hinged to the housing (1). One end of the drive plate (7) is connected to the housing (1) or the drive source (5) through a tension spring (10). The other end of the drive plate (7) is connected to the wire cutting shaft. (3) is movably connected at the tail end. The roller (9) has a gap with the cam (8) under the action of the tension of the tension spring (10). The drive source (5) can overcome the tension of the tension spring (10) to drive the drive plate (7) to rotate so that the roller (9) abuts against the outer peripheral wall of the cam (8). The main shaft (6) drives the cam (8) to rotate so that the drive plate (7) can swing through the roller (9) and drive the wire cutting shaft (3) to rotate.

2. The thread-cutting mechanism of a tube-type sewing machine according to claim 1, characterized in that, The tail end of the wire-cutting shaft (3) is fixedly connected to a roller (11), which is eccentrically arranged relative to the wire-cutting shaft (3). The other end of the drive plate (7) has a long strip-shaped groove (71), in which the roller (11) is embedded and can move relative to the groove wall of the groove (71) so that the other end of the drive plate (7) is movably connected to the tail end of the wire-cutting shaft (3).

3. The thread-cutting mechanism of a tube-type sewing machine according to claim 2, characterized in that, The tail end of the wire shearing shaft (3) is fixedly connected to a clamping ring (12), and the roller (11) is fixedly connected to the clamping ring (12). The axial direction of the roller (11) is parallel to the axial direction of the wire shearing shaft (3).

4. The thread-cutting mechanism of a tube sewing machine according to claim 1, 2, or 3, characterized in that, The drive source (5) is located directly below the drive plate (7). One end of the drive plate (7) has a downwardly protruding flange (72). After the output shaft of the drive source (5) extends out, it can push up the flange (72) to make the drive plate (7) rotate.

5. The thread-cutting mechanism of a tube sewing machine according to claim 1, 2, or 3, characterized in that, The drive piece (7) is bent, and the drive piece (7) is bent at its own hinge point.

6. The thread-cutting mechanism of a tube sewing machine according to claim 1, 2, or 3, characterized in that, The width of the other end of the driving piece (7) is greater than the width of one end of the driving piece (7).

7. The thread-cutting mechanism of a tube sewing machine according to claim 1, 2, or 3, characterized in that, The driving source (5) is a cylinder or an electromagnet.

8. The thread-cutting mechanism of a tube sewing machine according to claim 1, 2, or 3, characterized in that, The first end of the shearing shaft (3) is fixedly connected to a crank (13), and the moving blade (4) is fixedly connected to the crank (13). The moving blade (4) is ring-shaped.

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