Cylinder type thread cutting device of sewing machine

Abstract

The utility model belongs to the technical field of sewing machines, and particularly relates to a cylinder type thread cutting device of a sewing machine. According to the utility model, the roller foot machine comprises a base and a machine head, and one end of the base is provided with a trouser leg sleeving part for mounting a groove. The connecting rod assembly is arranged on the rear side of the rotating shuttle, and the swing arm connecting structure is arranged on the rear side of the trouser leg sleeving part, so that the sewing trimming space is not influenced and the trimming of the connecting rod assembly is stable during operation, and an operator on the front side is not influenced during operation by adopting a rear-mounted and external-mounted driving mode, so that the safety is improved, and the working efficiency is improved. Meanwhile, installation and stable thread trimming can be achieved in a small space, the swing arm connecting structure can be better controlled through the swing stroke of the swing arm, linear driving is changed into rotation, precision is higher, rigid connection is achieved, after multiple times of movement, the angle and the stroke of the thread trimming assembly are kept consistent, and thread trimming errors are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewing machines and relates to a thread cutting device for a cylinder-type sewing machine. Background Art

[0002] The reel-type sewing machine is a sewing machine used to sew the trouser legs of trousers and other cylindrical parts of clothing, and is widely used in clothing production. The existing reel-type sewing machine has a moving knife thread cutting structure located in the thread cutting space of the machine base, and its transmission structure is generally located in the machine base and extends to the thread cutting space and the front of the machine base. On the one hand, this type of setting is easy to affect the sewing thread cutting space during operation, and on the other hand, it is easy to affect the operator in front during operation. The safety is relatively general, and it is difficult to achieve installation and stable thread cutting in a small space. In addition, after a long period of thread cutting, the thread cutting stroke and angle are prone to deviation, affecting the accuracy. Therefore, it is urgent to design a thread cutting device for a cylinder sewing machine that can overcome the above defects.

[0003] In order to overcome the shortcomings of the prior art, people have proposed various solutions through continuous exploration. For example, a Chinese patent discloses a roller foot machine [application number: 201710045727.5], which also includes a mounting seat for installing a rotary hook mechanism or a bending needle mechanism. The front end face of the base opposite to the axial direction of the drive shaft has a front-to-back through-hole. The movement of the mounting seat toward the front end face of the base can enable the rotary hook mechanism or the bending needle mechanism on the mounting seat to pass through the hole and enter the mounting cavity. The mounting seat is detachably connected to the front end face of the base. Both sides of the base have mounting grooves for installing a separator mechanism that cooperates with the bending needle mechanism. The mounting grooves are open to the upper surface of the base, and the seam table cover plate covers the position where the mounting groove is opened when it is fixed to the base. Utility Model Content

[0004] The purpose of the utility model is to provide a thread cutting device for a cylinder-type sewing machine in view of the above-mentioned problems. The technical problem to be solved by the utility model is how to install and stably cut the thread in a smaller space to avoid deviations in the thread cutting stroke and angle.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A thread cutting device for a cylinder-type sewing machine, the foot-rolling machine comprises a base and a machine head, one end of the base is provided with a trouser leg set portion with an installation groove, the rotary shuttle is located in the installation groove, the rotary shuttle thread cutting device comprises a driving member located in the rear area of ​​the machine head, and a thread cutting assembly located in the installation groove, the driving member is installed on the base or the machine head, a transmission shaft is arranged at the rear side of the trouser leg set portion, the axis of the transmission shaft is arranged parallel to the axis of the rotary shuttle, the transmission shaft is rotatably connected to the base, one end of the transmission shaft is connected to the driving member through a swing arm connection structure, and the other end of the transmission shaft is connected to the thread cutting assembly through a connecting rod assembly, when the driving member drives the transmission shaft to rotate, the transmission shaft drives the thread cutting assembly to rotate through the swing arm connection structure to cut the sewing thread.

[0007] In the above-mentioned thread cutting device of the cylinder-type sewing machine, the swing arm connection structure includes a driver connection rotating arm arranged on the rear side of the base, and the driver connection rotating arm is connected to the connecting rod assembly through a transmission shaft.

[0008] In the thread cutting device of the cylinder-type sewing machine, a rotating arm accommodating cavity is provided at the rear side of the base, the transmission shaft is located in the rotating arm accommodating cavity and the transmission shaft is rotatably matched with the base.

[0009] In the above-mentioned cylinder-type sewing machine thread cutting device, the thread cutting assembly includes a moving knife group and a fixed knife group. The moving knife group is coaxially arranged with the rotary shuttle, the moving knife group is rotatably connected to the base, and the fixed knife group is fixedly connected to the base. When the driving member drives the transmission shaft to rotate, the transmission shaft drives the moving knife group to rotate through the driver connected rotating arm, and the moving knife group and the fixed knife group can cut the sewing thread.

[0010] In the above-mentioned cylinder-type sewing machine thread cutting device, the connecting rod assembly includes a swing arm and a connecting rod arranged in the base, the swing arm is connected to the driver connecting arm through a transmission shaft, the swing arm and the connecting rod are connected through a connecting shaft, and the connecting rod is connected to the moving knife group at one end away from the swing arm.

[0011] In the above-mentioned thread cutting device of the cylinder-type sewing machine, a swing arm accommodating chamber with an upward opening is provided in the base, the swing arm accommodating chamber is communicated with the mounting groove, and the swing arm is located in the swing arm accommodating chamber.

[0012] In the above-mentioned cylinder-type sewing machine thread cutting device, the moving knife group includes a moving knife connecting cylinder and a moving blade, the moving knife connecting cylinder and the moving blade are integrally formed, the moving knife connecting cylinder is connected to the connecting shaft of the rotary shuttle through a connecting structure, and the moving knife connecting cylinder is connected to the end of the connecting rod away from the swing arm through a clamping shaft.

[0013] In the above-mentioned cylinder-type sewing machine thread cutting device, the connecting structure includes a sleeve mounted on the connecting shaft of the rotary shuttle, the sleeve is fixedly connected to the base, the movable knife connecting cylinder is rotatably matched with the outer ring step of the sleeve, and a pressure plate is fixedly provided on the outer side of the movable knife connecting cylinder.

[0014] In the above-mentioned thread cutting device of the cylinder-type sewing machine, the axis center of the movable knife connecting the cylinder body coincides with the axis center of the sleeve.

[0015] In the above-mentioned thread cutting device of the cylinder-type sewing machine, the trouser leg covering portion has a downwardly recessed sewing operation cavity, and the sewing operation cavity corresponds to the position of the movable blade.

[0016] Compared with the existing technology, the advantages of the utility model are:

[0017] 1. During use of the utility model, the jeans leg to be processed is placed in the installation groove of the trouser leg set part, and the thread trimming assembly is used to trim the sewn rotary hook thread. The swing arm connecting structure is driven to swing by the driving member, and the transmission shaft is driven to rotate, thereby driving the connecting rod assembly to drive the thread trimming assembly to rotate to trim the sewing thread. By arranging the connecting rod assembly at the rear side of the rotary hook and the swing arm connecting structure at the rear side of the trouser leg set part, on the one hand, the sewing thread trimming space is not affected during operation, and the thread trimming of the connecting rod assembly is stable. On the other hand, the rear-mounted peripheral device is driven, which will not affect the operator in the front during operation, thereby increasing safety. At the same time, installation and relatively stable thread trimming can be achieved in a smaller space.

[0018] 2. The swing arm connection structure of the utility model can be better controlled through the swing stroke of the swing arm, and can be converted into rotation through linear drive, with higher precision and rigid connection. After multiple movements, the angle and stroke of the thread trimming assembly remain consistent, reducing the thread trimming error.

[0019] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the utility model.

[0021] Figure 2 It is a partial structural schematic diagram of the utility model.

[0022] Figure 3 It is a partial structural schematic diagram of the utility model in another direction.

[0023] Figure 4 It is a schematic diagram of the structure of the base.

[0024] Figure 5 It is a schematic diagram of the structure of the sleeve.

[0025] In the figure: base 1, machine head 2, trouser leg setting part 3, sewing operation chamber 3a, installation groove 4, connecting structure 5, shaft sleeve 5a, outer ring step 5b, pressing plate 5c, moving knife group 6, moving knife connecting cylinder 6a, moving blade 6b, transmission shaft 7, swing arm connecting structure 8, driver connecting rotating arm 8a, connecting rod assembly 9, swing arm 9a, connecting rod 9b, clamping shaft 9c, rotating arm accommodating rotating chamber 11, swing arm accommodating chamber 12. DETAILED DESCRIPTION

[0026] The utility model is further described below in conjunction with the accompanying drawings.

[0027] like Figure 1-5 As shown, a thread cutting device of a cylinder-type sewing machine is provided. The thread cutting device comprises a base 1 and a machine head 2. One end of the base 1 is provided with a trouser leg setting part 3 with an installation groove 4. The rotary shuttle is located in the installation groove 4. The rotary shuttle thread cutting device comprises a driving member located in the rear area of ​​the machine head 2 and a thread cutting assembly located in the installation groove 4. The driving member is installed on the base 1 or the machine head 2. A transmission shaft 7 is provided at the rear side of the trouser leg setting part 3. The axis of the transmission shaft 7 is arranged parallel to the axis of the rotary shuttle. The transmission shaft 7 is rotatably connected to the base 1. One end of the transmission shaft 7 is connected to the driving member through a swing arm connecting structure 8. The other end of the transmission shaft 7 is connected to the thread cutting assembly through a connecting rod assembly 9. When the driving member drives the transmission shaft 7 to rotate, the transmission shaft 7 drives the thread cutting assembly to rotate through the swing arm connecting structure 8 to cut the sewing thread.

[0028] In this embodiment, during use, the jeans leg to be processed is placed in the installation groove 4 of the trouser leg sleeve part 3, and the thread trimming assembly is used to trim the sewn rotary hook thread. The swing arm connecting structure 8 is driven by the driving member to swing, and the transmission shaft 7 is driven to rotate, thereby driving the connecting rod assembly 9 to drive the thread trimming assembly to rotate to trim the sewing thread. By arranging the connecting rod assembly 9 at the rear side of the rotary hook and the swing arm connecting structure 8 at the rear side of the trouser leg sleeve part 3, on the one hand, the sewing thread trimming space is not affected during operation, and the thread trimming of the connecting rod assembly 9 is stable. On the other hand, the rear-mounted peripheral driving form is adopted, which will not affect the front operator during operation, thereby increasing safety. At the same time, installation and relatively stable thread trimming can be achieved in a smaller space, and the swing arm connecting structure 8 can be better controlled by the swing stroke of the swing arm, and is converted into rotation by linear drive, with higher precision and rigid connection. After multiple movements, the angle and stroke of the thread trimming assembly are consistent, thereby reducing thread trimming errors.

[0029] Those skilled in the art should understand that the driving member in the rear area of ​​the machine head 2 can be a pneumatic cylinder, an oil cylinder or a linear motor.

[0030] Combination Figure 1-4As shown, the swing arm connection structure 8 includes a driver connecting rotating arm 8a arranged on the rear side of the base 1, and the driver connecting rotating arm 8a is connected to the connecting rod assembly 9 through a transmission shaft 7. A rotating arm accommodating rotating cavity 11 is opened on the rear side of the base 1, and the transmission shaft 7 is located in the rotating arm accommodating rotating cavity 11 and the transmission shaft 7 is rotatably matched with the base 1.

[0031] In this embodiment, the rotating arm accommodates the rotating cavity 11 for accommodating the fixed transmission shaft 7 and a part of the driver connecting rotating arm 8a, so as to facilitate the driver connecting rotating arm 8a to rotate. When it is necessary to rotate the connecting shaft of the rotary shuttle and drive the thread trimming assembly, the driving member in the rear area of ​​the head 2 is started at this time, and the driver connecting rotating arm 8a is driven to rotate by the driving member. The driver connecting rotating arm 8a drives the connecting rod assembly 9 to swing through the transmission shaft 7, thereby driving the thread trimming assembly to perform synchronous axial movement. The rear-mounted peripheral device is driven, which will not affect the operator at the front during operation, thereby increasing safety. At the same time, installation and relatively stable thread trimming can be achieved in a smaller space. The swing arm connecting structure 8 can be better controlled by the swing stroke of the swing arm, and is converted into rotation by linear drive, with higher precision and rigid connection. After multiple movements, the angle and stroke of the thread trimming assembly are consistent, thereby reducing thread trimming errors.

[0032] Combination Figure 2 As shown, the thread cutting assembly includes a movable knife group 6 and a fixed knife group. The movable knife group 6 is coaxially arranged with the rotary shuttle. The movable knife group 6 is rotatably connected to the base 1, and the fixed knife group is fixedly connected to the base 1. When the driving member drives the transmission shaft 7 to rotate, the transmission shaft 7 drives the movable knife group 6 to rotate through the driver connected rotating arm 8a, and the movable knife group 6 and the fixed knife group can cut the sewing thread.

[0033] In this embodiment, the fixed knife group is fixedly connected to the base 1. During the thread cutting process, when the driving member drives the transmission shaft 7 to rotate, the transmission shaft 7 drives the movable knife group 6 to rotate through the driver connecting arm 8a, and the movable knife group 6 and the fixed knife group can cut the sewing thread.

[0034] The connecting rod assembly 9 includes a swing arm 9a and a connecting rod 9b arranged in the base 1. The swing arm 9a is connected to the driver connecting arm 8a through a transmission shaft 7, and the swing arm 9a and the connecting rod 9b are connected through a connecting shaft. The end of the connecting rod 9b away from the swing arm 9a is connected to the movable knife group 6.

[0035] In this embodiment, when the driver connecting rotating arm 8a rotates, the driver connecting rotating arm 8a synchronously drives the swing arm 9a and the connecting rod 9b to swing through the transmission shaft 7, and drives the movable knife group 6 to rotate through the connecting rod 9b.

[0036] Combination Figure 1-3As shown, a swing arm accommodating chamber 12 with an opening facing upward is provided in the base 1 , the swing arm accommodating chamber 12 is communicated with the mounting groove 4 , and the swing arm 9 a is located in the swing arm accommodating chamber 12 .

[0037] In this embodiment, the swing arm accommodating chamber 12 is used to install the swing arm 9a and the connecting rod 9b. The swing arm accommodating chamber 12 is connected to the installation groove 4 to ensure that there will be no interference with the base 1 during transmission.

[0038] Combination Figure 1-3 As shown, the movable knife group 6 includes a movable knife connecting cylinder 6a and a movable blade 6b, and the movable knife connecting cylinder 6a and the movable blade 6b are integrally formed. The movable knife connecting cylinder 6a is connected to the connecting shaft of the rotary shuttle through a connecting structure 5, and the movable knife connecting cylinder 6a is connected to the end of the connecting rod 9b away from the swing arm 9a through a clamping shaft 9c.

[0039] In this embodiment, a connecting structure 5 is provided between the movable knife connecting cylinder 6a and the connecting shaft of the rotary shuttle, so that the movable knife connecting cylinder 6a can rotate axially.

[0040] Combination Figure 1-5 As shown, the connecting structure 5 includes a sleeve 5a sleeved on the connecting shaft of the rotary shuttle, the sleeve 5a is fixedly connected to the base 1, the movable knife connecting cylinder 6a is rotatably matched with the outer ring step 5b of the sleeve 5a, and a pressure plate 5c is fixedly provided on the outer side of the movable knife connecting cylinder 6a.

[0041] In this embodiment, when the connecting rod 9b swings, the movable knife connecting cylinder 6a and the outer ring step 5b of the shaft sleeve 5a are rotated and matched, and the pressure plate 5c can prevent the movable knife connecting cylinder 6a from falling off.

[0042] The axis of the movable knife connecting cylinder 6a coincides with the axis of the shaft sleeve 5a. The trouser leg sleeve portion 3 has a downwardly recessed sewing operation cavity 3a, and the sewing operation cavity 3a corresponds to the position of the movable knife 6b.

[0043] In this embodiment, the axis of the movable knife connecting cylinder 6a coincides with the axis of the sleeve 5a, with high precision. During the sewing process of the trouser legs, the downwardly recessed sewing operation cavity 3a can prevent the needle from directly hitting the trouser leg sleeve portion 3.

[0044] The working principle of the utility model is:

[0045] During use, the jeans leg to be processed is placed in the installation groove 4 of the trouser leg sleeve part 3, and the thread trimming assembly is used to trim the sewn hook thread. The driver connecting rotating arm 8a is driven to swing through the driving member, and the transmission shaft 7 is driven to rotate, thereby driving the swing arm 9a and the connecting rod 9b to drive the thread trimming assembly to rotate to trim the sewing thread. By arranging the swing arm 9a and the connecting rod 9b at the rear side of the rotary shuttle, and arranging the driver connecting rotating arm 8a at the rear side of the trouser leg sleeve part 3, on the one hand, it does not affect the sewing thread trimming space during operation, and the thread trimming of the connecting rod assembly 9 is stable. On the other hand, the rear-mounted driving peripheral is adopted, which will not affect the front operator during operation, thereby increasing safety. At the same time, installation and relatively stable thread trimming can be achieved in a smaller space, and the driver connecting rotating arm 8a can be better controlled by the swing stroke of the swing arm, and the linear drive is converted into rotation, with higher precision and rigid connection. After multiple movements, the angle and travel of the thread trimming assembly are The process is consistent, reducing the thread trimming error, the arm accommodating rotating chamber 11 is used to place the fixed transmission shaft 7 and a part of the driver connecting the rotating arm 8a, which is convenient for the driver connecting the rotating arm 8a to rotate. When the driver connecting the rotating arm 8a rotates, the driver connecting the rotating arm 8a synchronously drives the swing arm 9a and the connecting rod 9b to swing through the transmission shaft 7, and drives the movable knife group 6 to rotate through the connecting rod 9b. The swing arm accommodating chamber 12 is used to install the swing arm 9a and the connecting rod 9b. The swing arm accommodating chamber 12 is connected with the installation groove 4 to ensure that there is no interference with the base 1 during transmission. When the connecting rod 9b swings, the movable knife connecting cylinder 6a rotates with the outer ring step 5b of the sleeve 5a, and the pressing plate 5c can prevent the movable knife connecting cylinder 6a from falling off. The axis of the movable knife connecting cylinder 6a coincides with the axis of the sleeve 5a, with high precision. In the process of sewing the trouser legs, the stitches can be prevented from directly hitting the trouser leg sleeve 3 through the downwardly recessed sewing operation chamber 3a.

[0046] 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 without departing from the spirit of the present invention.

[0047] Although the present invention uses the terms such as base 1, machine head 2, trouser leg sleeve 3, sewing operation cavity 3a, installation groove 4, connecting structure 5, sleeve 5a, outer ring step 5b, pressing plate 5c, moving knife group 6, moving knife connecting cylinder 6a, moving blade 6b, transmission shaft 7, swing arm connecting structure 8, driver connecting rotating arm 8a, connecting rod assembly 9, swing arm 9a, connecting rod 9b, clamping shaft 9c, rotating arm accommodating rotating cavity 11, swing arm accommodating chamber 12, etc. more frequently, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the utility model, and interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A thread trimming device for a cylinder-type sewing machine, the foot reel machine comprising a base (1) and a machine head (2), one end of the base (1) having a trouser leg sleeve portion (3) with a mounting groove (4), the rotary hook being located in the mounting groove (4), characterized in that: The rotary hook thread trimming device comprises a driving member located in the rear area of ​​a machine head (2) and a thread trimming assembly located in a mounting groove (4); the driving member is mounted on a base (1) or the machine head (2); a transmission shaft (7) is arranged on the rear side of a trouser leg sleeve portion (3); the axis of the transmission shaft (7) is arranged parallel to the axis of the rotary hook; the transmission shaft (7) is rotatably connected to the base (1); one end of the transmission shaft (7) is connected to the driving member via a swing arm connection structure (8); the other end of the transmission shaft (7) is connected to the thread trimming assembly via a connecting rod assembly (9); when the driving member drives the transmission shaft (7) to rotate, the transmission shaft (7) drives the thread trimming assembly to rotate via the swing arm connection structure (8) to cut the sewing thread.

2. The thread cutting device of a cylinder-type sewing machine according to claim 1, characterized in that: The swing arm connection structure (8) comprises a driver connection rotating arm (8a) arranged on the rear side of the base (1); the driver connection rotating arm (8a) is connected to the connecting rod assembly (9) via a transmission shaft (7).

3. The thread cutting device of a cylinder-type sewing machine according to claim 2, characterized in that: A rotating arm accommodating cavity (11) is provided on the rear side of the base (1), the transmission shaft (7) is located in the rotating arm accommodating cavity (11), and the transmission shaft (7) and the base (1) are rotatably matched.

4. The thread cutting device of a cylinder-type sewing machine according to claim 3, characterized in that: The thread cutting assembly comprises a movable knife assembly (6) and a fixed knife assembly. The movable knife assembly (6) is coaxially arranged with the rotary shuttle. The movable knife assembly (6) is rotatably connected to the base (1). The fixed knife assembly is fixedly connected to the base (1). When the driving member drives the transmission shaft (7) to rotate, the transmission shaft (7) drives the movable knife assembly (6) to rotate through the driver connected rotating arm (8a). The movable knife assembly (6) and the fixed knife assembly can cut the sewing thread.

5. The thread cutting device of a cylinder-type sewing machine according to claim 4, characterized in that: The connecting rod assembly (9) comprises a swing arm (9a) and a connecting rod (9b) arranged in the base (1); the swing arm (9a) is connected to the driver connecting rotating arm (8a) via a transmission shaft (7); the swing arm (9a) and the connecting rod (9b) are connected via a connecting shaft; and the end of the connecting rod (9b) away from the swing arm (9a) is connected to the moving knife assembly (6).

6. The thread cutting device of a cylinder-type sewing machine according to claim 5, characterized in that: The base (1) is provided with a swing arm accommodating chamber (12) with an opening facing upwards, the swing arm accommodating chamber (12) is connected to the mounting groove (4), and the swing arm (9a) is located in the swing arm accommodating chamber (12).

7. The thread cutting device of a cylinder-type sewing machine according to claim 4, 5 or 6, characterized in that: The movable knife assembly (6) comprises a movable knife connecting cylinder (6a) and a movable blade (6b); the movable knife connecting cylinder (6a) and the movable blade (6b) are integrally formed; the movable knife connecting cylinder (6a) is connected to the connecting shaft of the rotary shuttle via a connecting structure (5); and the movable knife connecting cylinder (6a) is connected to an end of the connecting rod (9b) away from the swing arm (9a) via a clamping shaft (9c).

8. The thread cutting device of a cylinder-type sewing machine according to claim 7, characterized in that: The connection structure (5) comprises a sleeve (5a) sleeved on the connecting shaft of the rotary shuttle, the sleeve (5a) being fixedly connected to the base (1), the movable knife connecting cylinder (6a) being rotatably matched with the outer ring step (5b) of the sleeve (5a), and a pressure plate (5c) being fixedly provided on the outer side of the movable knife connecting cylinder (6a).

9. The thread cutting device of a cylinder-type sewing machine according to claim 8, characterized in that: The axis center of the movable knife connecting cylinder (6a) coincides with the axis center of the shaft sleeve (5a).

10. The thread cutting device of a cylinder-type sewing machine according to claim 7, characterized in that: The trouser leg covering portion (3) has a downwardly recessed sewing operation cavity (3a), and the sewing operation cavity (3a) corresponds to the position of the movable blade (6b).

Images