Sewing machine and upper forking adjusting structure thereof

Abstract

The utility model relates to an upper forking adjusting structure which comprises an adjusting rod and further comprises a moving rod and a driving structure, the length direction of the adjusting rod is vertical, the length direction of the moving rod is transverse, the moving rod is hinged to the top end of the adjusting rod by arranging a hinge shaft, and the length direction of the hinge shaft is horizontal and is perpendicular to the length direction of the moving rod; the driving structure drives the moving rod to slide back and forth along the length direction; the driving structure comprises a driving gear and a stepping motor, a moving rack is arranged on the moving rod, the driving gear is meshed with the moving rack, and the length direction of a rotating shaft of the driving gear is parallel to the length direction of the hinge shaft; the stepping motor drives the driving gear to rotate. According to the scheme, a worker can adjust the cloth feeding distance of the upper-layer feed dog through the gear switch, manual operation is not needed, adjustment is convenient, the stepping motor is provided with a brake, when the sewing machine is used, the stepping motor cannot be loosened, and the upper-layer feed dog is not prone to deviation.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of sewing machine accessories, in particular to a sewing machine and an upper fork movement adjusting structure thereof. BACKGROUND

[0002] When double-layer fabric is sewn, in order to make the upper fabric and the lower fabric move synchronously, an upper feed dog and a lower feed dog are arranged to transport the fabric, and the upper fork movement adjusting structure is used to adjust the movement of the upper feed dog to be synchronous with the lower feed dog.

[0003] A patent with the authorization announcement number CN217997516U discloses a spacing adjusting mechanism of an upper feed dog of a sewing machine, which comprises an adjusting shaft mounted in a lockstitch machine base, a fork-shaped piece connected to one end of the adjusting shaft, and an adjusting rod connected to the other end of the adjusting shaft through a connecting plate; the adjusting rod extends out of the top surface of the lockstitch machine base and is connected with a handle; the handle is slidably mounted in a handle sliding groove of a handle locking plate. The handle is arranged on the top of the lockstitch machine base, and the front and rear feeding distances of the feed dog frame are controlled by controlling the rotating angle of the adjusting shaft. A locking bolt is arranged in the middle of the handle to prevent the adjusting rod from loosening due to vibration during work.

[0004] In the related technology described above, it is found in the use process that the locking bolt still loosens during the working process of the sewing machine, affecting the use of the sewing machine. Content of the utility model

[0005] In order to improve the phenomenon that the locking bolt still loosens during the working process of the sewing machine, the present application provides a sewing machine and an upper fork movement adjusting structure thereof.

[0006] In the first aspect, the present application provides an upper fork movement adjusting structure, which adopts the following technical scheme:

[0007] The upper fork movement adjusting structure comprises an adjusting rod, a moving rod and a driving structure, the length direction of the adjusting rod is vertical, the length direction of the moving rod is horizontal, the moving rod is hinged to the top end of the adjusting rod through a hinge shaft, and the length direction of the hinge shaft is horizontal and perpendicular to the length direction of the moving rod; the driving structure drives the moving rod to reciprocatingly slide along the length direction thereof.

[0008] The driving structure comprises a driving gear and a stepping motor, the moving rod is provided with a moving rack, the driving gear engages with the moving rack, and the rotating shaft length direction of the driving gear is parallel to the length direction of the hinge shaft; the stepping motor drives the driving gear to rotate.

[0009] By adopting the above technical scheme, the bottom end of the adjusting rod is connected with the adjusting shaft, the adjusting shaft is rotated to adjust the upper feed dog, the top end of the adjusting rod is hingedly connected with the moving rod, the stepping motor drives the gear to rotate, the moving rack is driven to slide to drive the moving rod to slide, so that the adjusting rod drives the adjusting shaft to rotate. The stepping motor is provided with a brake structure, which is stable after stopping rotating, so that the driving gear and the moving rod cannot rotate, so that the adjusting rod is not easy to loosen or abnormally displace, and the upper feed dog is stable after adjustment.

[0010] Optionally, the sewing machine further comprises a stabilizing structure for keeping the moving rack engaged with the driving gear, the stabilizing structure comprising a fixing plate, a pressing piece and a pressing spring, the fixing plate being used for fixing the outer wall of the sewing machine, the pressing piece being slidingly connected to the fixing plate, the bottom of the pressing piece abutting against the top of the moving rack, and the pressing spring keeping the pressing piece pressed against the top of the moving rack.

[0011] By adopting the above technical scheme, one end of the moving rod is hingedly connected with the adjusting rod, and the other end is lapped on the driving gear, the moving rack is pressed on the driving gear by the pressing piece, so that the connection is stable and the adjustment is facilitated.

[0012] Optionally, the pressing piece is fixed with a guide rod, the fixing plate is provided with a guide hole for vertical sliding of the guide rod, the pressing spring is sleeved on the guide rod, and the top end of the pressing spring abuts against the fixing plate, and the bottom end of the pressing spring abuts against the pressing piece.

[0013] By adopting the above technical scheme, the guide rod is provided, so that the sliding direction of the pressing piece is stable, and the moving rack is stably pressed on the gear.

[0014] Optionally, the end of the pressing piece is provided with a limiting groove for accommodating the moving rack.

[0015] By adopting the above technical scheme, the limiting groove positions the moving rod, so that the installation is facilitated, and the moving rack is not easy to deviate.

[0016] Optionally, the pressing piece is located directly above the driving gear.

[0017] By adopting the above technical scheme, the driving gear supports the moving rack, so that the moving rack is prevented from being deformed.

[0018] In a second aspect, the application provides a sewing machine, which adopts the following technical scheme:

[0019] A sewing machine comprises a machine shell and a control screen, the machine shell being provided with the above-mentioned upper cross adjustment structure, the machine shell being provided with an outer groove for sliding of the moving rod, the height of the outer groove being greater than the cross-sectional height of the moving rod; the control screen being electrically connected with the stepping motor, and the control screen being provided with a gear switch for controlling rotation of the stepping motor.

[0020] By adopting the above technical scheme, the height of the outer groove is greater than the sectional height of the moving rod, and space is reserved for the vertical displacement of the moving rod when the moving rod moves. By arranging the gear position switch, the rotation of the stepping motor is conveniently controlled, the fabric feeding distance of the upper fabric feeding dog is controlled through the gear position, the adjustment is convenient, and the memory function is provided.

[0021] In summary, the present application has at least one of the following beneficial technical effects:

[0022] 1. The stepping motor drives the gear to rotate, and then the moving rack drives the moving rod to slide, so that the adjusting rod drives the adjusting shaft to rotate. The stepping motor has a brake structure, which is stable after stopping rotating, so that the adjusting rod is not easy to loosen or abnormally displace, and the upper fabric feeding dog has high stability after the adjustment is completed and used;

[0023] 2. The lower pressing piece presses the moving rack on the driving gear, so that the connection between the moving rack and the driving gear is stable;

[0024] 3. The gear position switch is electrically connected to the control screen, and the control screen is electrically connected to the stepping motor. The stepping motor is conveniently controlled through the gear position, so that the fabric feeding distance of the upper fabric feeding dog is controlled, the adjustment is convenient, and the memory function is provided. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a schematic diagram of the upper cross dynamic adjustment structure of the embodiment.

[0026] Figure 2 is a schematic diagram of the structure of the sewing machine of the embodiment Figure 1 , mainly showing the structure of the outer groove and the installation position of the driving structure.

[0027] Figure 3 is a schematic diagram of the structure of the sewing machine of the embodiment Figure 2 , mainly showing the position of the control screen.

[0028] BRIEF DESCRIPTION OF DRAWINGS: 1, adjusting rod; 11, hinged shaft; 2, moving rod; 3, driving structure; 31, driving gear; 32, stepping motor; 33, moving rack; 4, stabilizing structure; 41, fixed plate; 42, lower pressing piece; 43, lower pressing spring; 44, guide rod; 45, guide hole; 5, limiting groove; 6, machine shell; 7, control screen; 8, outer groove. DETAILED DESCRIPTION

[0029] The present application will be further described in detail below with reference to the drawings.

[0030] The embodiment of the present application discloses an upper cross dynamic adjustment structure. Referring to Figure 1The uplink dynamic adjustment structure comprises an adjustment rod 1, a moving rod 2 and a driving structure 3 for the sliding of the moving rod 2. The length direction of the adjustment rod 1 is vertical, and the bottom end of the adjustment rod 1 is connected with an adjustment shaft, which is connected with the upper layer feed dog through a cam structure. After the adjustment shaft is rotated, the feed distance of the upper layer feed dog is changed.

[0031] Referring to Figure 1 , the length direction of the moving rod 2 is horizontal, and the moving rod 2 is hinged to the top end of the adjustment rod 1 through a hinge shaft 11. The length direction of the hinge shaft 11 is horizontal and perpendicular to the length direction of the moving rod 2.

[0032] Referring to Figure 1 , the driving structure 3 drives the moving rod 2 to slide back and forth along the length direction, and the moving rod 2 abuts against the top end of the adjustment rod 1 when sliding, thereby driving the bottom end of the adjustment rod 1 to drive the adjustment shaft to rotate, so as to realize the adjustment of the feed distance of the upper layer feed dog.

[0033] Referring to Figure 1 , the driving structure 3 comprises a driving gear 31 and a stepping motor 32, and the moving rod 2 is fixed with a moving rack 33, and the tooth part of the moving rack 33 faces downward. The driving gear 31 is located below the moving rack 33, and the driving gear 31 engages the moving rack 33. The rotation axis of the driving gear 31 is parallel to the length direction of the hinge shaft 11. The motor shaft of the stepping motor 32 is coaxially fixed with the driving gear 31, and the stepping motor 32 drives the driving gear 31 to rotate.

[0034] Referring to Figure 1 , the uplink dynamic adjustment structure further comprises a stabilizing structure 4 for keeping the moving rack 33 engaged with the driving gear 31. The stabilizing structure 4 comprises a fixed plate 41, a pressing piece 42 and a pressing spring 43. The fixed plate 41 is used for fixing the outer wall of the sewing machine, the top of the pressing piece 42 is fixed with a guide rod 44, the length direction of the guide rod 44 is vertical, and the fixed plate 41 is provided with a guide hole 45 for the vertical sliding of the guide rod 44, and the pressing piece 42 is slidably connected to the fixed plate 41 through the guide rod 44.

[0035] Referring to Figure 2 , the pressing spring 43 is sleeved on the guide rod 44, the top end of the pressing spring 43 abuts against the fixed plate 41, and the bottom end of the pressing spring 43 abuts against the pressing piece 42. The bottom of the pressing piece 42 abuts against the top of the moving rack 33, the bottom of the pressing piece 42 is provided with a limiting groove 5, and the moving rack 33 is located in the limiting groove 5. The pressing piece 42 is located directly above the driving gear 31, and the pressing spring 43 drives the pressing piece 42 to press on the top of the moving rack 33, so as to press the moving rack 33 against the driving gear 31 and keep the two in stable engagement.

[0036] The implementation principle of the upper fork movement adjusting structure is as follows: when the fabric feeding interval of the upper fabric feeding tooth is adjusted, the stepping motor 32 drives the driving gear 31 to rotate, the moving rod 2 is slided, the adjusting rod 1 is driven to rotate by the adjusting rod 1, the fabric feeding interval of the upper fabric feeding tooth is changed through the cam cooperation. The upper fabric feeding tooth is adjusted by the stepping motor 32, so that the adjustment is convenient, and the loosening is not easy to occur, so that the stability of the motor is good when the motor is used.

[0037] The application further discloses a sewing machine, referring to Figure 3 、 ​ , comprising a shell 6 and a control screen 7, the shell 6 is provided with the upper fork movement adjusting structure, the shell 6 is provided with an outer groove 8 for the moving rod 2 to slide, the height of the outer groove 8 is greater than the cross-sectional height of the moving rod 2. The fixed plate 41 is fixed to the outer side of the shell, and the stepping motor 32 is fixed to the outer side of the shell.

[0038] The control screen 7 is electrically connected with the stepping motor 32, the control screen 7 is provided with a gear switch (not shown in the figure) to control the rotation of the stepping motor 32, so as to control the moving interval of the moving rod 2, and then control the rotation of the adjusting shaft, so that the adjustment is convenient. The worker can realize the fabric feeding interval adjustment of the upper fabric feeding tooth through the gear switch, without manual operation, so that the adjustment is convenient, and the stepping motor 32 is provided with a brake, so that the stepping motor 32 is not loosened when the sewing machine is used, so that the upper fabric feeding tooth is not easy to deviate.

[0039] The above are preferred embodiments of the application, and do not limit the protection scope of the application, so that: all equivalent changes made according to the structure, shape, principle of the application should be covered in the protection scope of the application.

Claims

1. A structure for adjusting the height of a top cross member, comprising an adjusting rod (1), characterized in that: It also comprises a moving rod (2) and a driving structure (3), the length direction of the adjusting rod (1) is vertical, the length direction of the moving rod (2) is horizontal, the moving rod (2) is hinged to the top end of the adjusting rod (1) through a hinge shaft (11), the length direction of the hinge shaft (11) is horizontal and perpendicular to the length direction of the moving rod (2); the driving structure (3) drives the moving rod (2) to reciprocate along the length direction thereof. The driving structure (3) comprises a driving gear (31) and a stepping motor (32), the moving rod (2) is provided with a moving rack (33), the driving gear (31) engages with the moving rack (33), the rotation axis of the driving gear (31) is parallel to the length direction of the hinge shaft (11); the stepping motor (32) drives the driving gear (31) to rotate.

2. The upshift regulation structure according to claim 1, characterized by: It also comprises a stabilizing structure (4) for keeping the moving rack (33) engaged with the driving gear (31), the stabilizing structure (4) comprises a fixed plate (41), a pressing piece (42) and a pressing spring (43), the fixed plate (41) is used for fixing the outer wall of the sewing machine, the pressing piece (42) is slidingly connected to the fixed plate (41), the bottom of the pressing piece (42) abuts against the top of the moving rack (33), the pressing spring (43) drives the pressing piece (42) to keep pressing on the top of the moving rack (33).

3. The upper fork adjustment structure according to claim 2, characterized by: The pressing piece (42) is fixed with a guide rod (44), the fixed plate (41) is provided with a guide hole (45) for vertical sliding of the guide rod (44), the pressing spring (43) is sleeved on the guide rod (44), and the top end of the pressing spring (43) abuts against the fixed plate (41), and the bottom end of the pressing spring (43) abuts against the pressing piece (42).

4. The upper fork adjustment structure according to claim 2, characterized by: The end of the pressing piece (42) is provided with a limiting groove (5) for accommodating the moving rack (33).

5. The upper fork adjustment structure according to claim 2, characterized by: The pressing piece (42) is located directly above the driving gear (31).

6. A sewing machine comprising a casing (6) and a control panel (7), characterized in that, The shell (6) is provided with the upper cross dynamic adjusting structure according to any one of claims 1-4, the shell (6) is provided with an outer groove (8) for sliding of the moving rod (2), the height of the outer groove (8) is greater than the cross-sectional height of the moving rod (2); the control panel (7) is electrically connected to the stepping motor (32), and the control panel (7) is provided with a gear switch for controlling rotation of the stepping motor (32).

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