Lower differential feeding mechanism of sewing machine

Abstract

The utility model provides a lower differential feeding mechanism of a sewing machine, which comprises a main feeding shaft, a lower differential feeding shaft and a feed lifting shaft, the lower differential feeding shaft is movably sleeved on the main feeding shaft and can rotate independently, and the lower differential feeding mechanism further comprises a differential adjusting structure. The differential adjusting structure comprises a driving crank arranged on the main feeding shaft, a driven crank arranged on the lower differential feeding shaft and an adjusting crank arranged on the feed lifting shaft, a main feeding connecting rod is arranged between the driving crank and the adjusting crank, one end of the main feeding connecting rod is slidably connected to the driving crank through a first sliding block, and the other end of the main feeding connecting rod is slidably connected to the driven crank through a second sliding block; a lower differential feeding connecting rod is arranged between the driven crank and the adjusting crank, one end of the lower differential feeding connecting rod is connected with the driven crank, the other end of the lower differential feeding connecting rod is arranged on the adjusting crank, and the device further comprises an adjusting driving structure for adjusting the relative sliding position of the first sliding block and the second sliding block. The stroke difference between main feeding and lower differential feeding is changed through electric control, and the automatic feeding device is rapid, accurate and simple in structure.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewing machine technical field, especially a sewing machine's lower differential feeding mechanism. BACKGROUND

[0002] Sewing machine lower differential feeding refers to the feeding of front and rear feeding teeth respectively, and the feeding speed and feeding distance of the front and rear feeding teeth can be adjusted independently, so as to control the shrinkage or stretching of the sewing material. By adjusting the difference between the feeding speeds of the front and rear teeth, the mechanism can effectively control the feeding amount of the upper and lower layers of material and improve the sewing quality.

[0003] The existing mechanism for adjusting the front and rear feeding teeth usually adopts a mechanical structure and needs to be manually adjusted by artificial, realizing two states of positive difference and negative difference, and the structure is complex and inconvenient to adjust. UTILITY MODEL CONTENT

[0004] In order to solve the above problems of the prior art, the utility model provides a sewing machine's lower differential feeding mechanism, which is simple in structure and fast and convenient to adjust.

[0005] The technical scheme adopted is as follows:

[0006] A sewing machine's lower differential feeding mechanism, comprising a lower bottom plate, a main feeding shaft rotatably arranged on the lower bottom plate, a lower differential feeding shaft, and a tooth lifting shaft, the lower differential feeding shaft is movably sleeved on the main feeding shaft, and a main feeding tooth structure is arranged between the main feeding shaft and the tooth lifting shaft; a lower differential feeding tooth structure is arranged between the lower differential feeding shaft and the tooth lifting shaft, and the differential adjustment structure comprises a driving crank arranged on the main feeding shaft, a driven crank arranged on the lower differential feeding shaft, and an adjustment crank arranged on the tooth lifting shaft, a main feeding connecting rod is arranged between the driving crank and the adjustment crank, one end of the main feeding connecting rod is slidably connected to the driving crank through a first sliding block, the other end of the main feeding connecting rod is slidably connected to the adjustment crank through a second sliding block, and the adjustment crank is provided with a first crank for sliding of the second sliding block; a lower differential feeding connecting rod is arranged between the driven crank and the adjustment crank, one end of the lower differential feeding connecting rod is connected to the driven crank, the other end of the lower differential feeding connecting rod is arranged on the adjustment crank, the adjustment crank is provided with a second crank for connection of one end of the lower differential feeding connecting rod, and an adjustment driving structure for adjusting the relative sliding positions of the first sliding block and the second sliding block is further included.

[0007] Further, the adjustment driving structure comprises a driving motor and a double-bar crank arranged on the driving motor, one end of the double-bar crank is connected to the main feeding connecting rod near the end of the driving crank through a first transmission rod, and the other end of the double-bar crank is connected to the main feeding connecting rod near the end of the adjustment crank through a second transmission rod.

[0008] Further, the main feeding tooth structure comprises a main feeding tooth, a main feeding tooth frame, a main feeding tooth frame seat arranged on the main feeding shaft, and a first yoke arranged on the lifting tooth shaft and matched with the main feeding tooth frame.

[0009] Further, the lower differential feeding tooth structure comprises a lower differential feeding tooth, a lower differential feeding tooth frame, a lower differential feeding tooth frame seat arranged on the lower differential feeding shaft, and a second yoke arranged on the lifting tooth shaft and matched with the lower differential feeding tooth frame.

[0010] Further, the main feeding shaft is provided with a driving structure for driving the rotation of the main feeding shaft.

[0011] Further, the main feeding connecting rod is provided with a reset spring between one end of the main feeding connecting rod and a motor mounting plate on which a driving motor is mounted.

[0012] Further, one end of the lower differential feeding connecting rod is adjustably arranged on the adjusting crank, and the second crank is provided with at least two adjusting holes for connecting the lower differential feeding connecting rod.

[0013] Compared with the prior art, the sewing machine lower differential feeding mechanism has the following beneficial effects:

[0014] The main feeding shaft and the lower differential feeding shaft can be separately rotated, the driving crank is arranged on the main feeding shaft, the driven crank is arranged on the lower differential feeding shaft, the adjusting crank is arranged on the lifting tooth shaft, the main feeding connecting rod is arranged between the driving crank and the first crank of the adjusting crank, the lower differential feeding connecting rod is arranged between the driven crank and the second crank of the adjusting crank, the two ends of the main feeding connecting rod are connected to the corresponding cranks through sliding blocks, the adjusting driving structure is arranged on the main feeding connecting rod and can drive the relative sliding displacement of the sliding blocks at the two ends of the main feeding connecting rod, the sliding displacement of the sliding blocks at the two ends can be adjusted, the rotation angles of the main feeding shaft and the lifting tooth shaft can be different, the rotation of the lifting tooth shaft can drive the rotation of the lower differential feeding shaft through the lower differential feeding connecting rod, the rotation angles of the main feeding shaft and the lower differential feeding shaft can be adjusted by adjusting the positions of the sliding blocks, and thus the main feeding stroke and the lower differential feeding stroke can be adjusted.

[0015] The adjusting driving structure comprises a driving motor and a double-rod crank arranged on the driving motor, the double-rod crank is provided with a transmission rod at each end and connected to the two ends of the main feeding connecting rod, the driving motor drives the double-rod crank to swing, the main feeding connecting rod is inclined through the transmission rod, the positions of the sliding blocks at the two ends of the main feeding connecting rod are adjusted, the driving is electrically controlled, the positions of the sliding blocks can be adjusted according to actual needs, the difference between the main feeding stroke and the lower differential feeding stroke is changed, the control is more accurate, and the adjustment is more convenient and faster. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is an angle structural schematic view of the utility model.

[0017] Figure 2 is a side view of the present application;

[0018] Figure 3 is a partial structure view of the present application;

[0019] Figure 4 is a structure view of the present application from another angle;

[0020] The main feeding shaft 1, the driving crank 101, the lower differential feeding shaft 2, the driven crank 201, the lifting tooth shaft 3, the adjusting crank 301, the first crank 3011, the second crank 3012, the main feeding tooth structure 4, the main feeding tooth 401, the main feeding tooth frame 402, the main feeding tooth frame seat 403, the first shift fork 404, the lower differential feeding tooth structure 5, the lower differential feeding tooth 501, the lower differential feeding tooth frame 502, the lower differential feeding tooth frame seat 503, the second shift fork 504, the differential adjusting structure 6, the adjusting hole position 7, the adjusting driving structure 8, the driving motor 801, the double-rod crank 802, the first transmission rod 803, the second transmission rod 804, the main feeding connecting rod 9, the first sliding block 901, the second sliding block 902, the lower differential feeding connecting rod 10, the motor mounting plate 11, and the reset spring 12. DETAILED DESCRIPTION

[0021] The present application will be further described below in combination with specific embodiments.

[0022] Reference Figures 1-4 A lower differential feeding mechanism of a sewing machine, comprising a main feeding shaft 1, a lower differential feeding shaft 2, and a lifting tooth shaft 3, the lower differential feeding shaft 2 is movably sleeved on the main feeding shaft 1, and the main feeding shaft 1 is provided with a main feeding tooth structure 4 between the main feeding shaft 1 and the lifting tooth shaft 3; the lower differential feeding shaft 2 is provided with a lower differential feeding tooth structure 5 between the lower differential feeding shaft 2 and the lifting tooth shaft 3, the lower differential feeding shaft 2 is movably sleeved on the main feeding shaft 2, and the two can rotate and drive the corresponding feeding tooth to move independently.

[0023] The differential adjustment structure 6 comprises a driving crank 101 arranged on the main feeding shaft 1, a driven crank 201 arranged on the lower differential feeding shaft 2, and an adjustment crank 301 arranged on the lifting tooth shaft 3. The driving crank 101 and the adjustment crank 301 are connected by the main feeding connecting rod 9. One end of the main feeding connecting rod 9 is connected to the driving crank 101 through the first sliding block 901, and the other end is connected to the adjustment crank 301 through the second sliding block 902. The adjustment crank 301 is provided with the first crank 3011 for the sliding of the second sliding block 901. The driven crank 301 and the adjustment crank 301 are connected by the lower differential feeding connecting rod 10. One end of the lower differential feeding connecting rod 10 is connected to the driven crank 301, and the other end is arranged on the adjustment crank 301. The adjustment crank 301 is provided with the second crank 3012 for the connection of one end of the lower differential feeding connecting rod. The adjustment driving structure 8 is arranged to adjust the relative sliding positions of the first sliding block 901 and the second sliding block 902.

[0024] The main feeding tooth structure 4 comprises the main feeding tooth 401, the main feeding tooth frame 402, and the main feeding tooth frame seat 403 arranged on the main feeding shaft 1. The lifting tooth shaft 3 is provided with the first shift fork 404 matched with the main feeding tooth frame 402. The lower differential feeding tooth structure 5 comprises the lower differential feeding tooth 501, the lower differential feeding tooth frame 502, and the lower differential feeding tooth frame seat 503 arranged on the lower differential feeding shaft 2. The lifting tooth shaft 3 is provided with the second shift fork 504 matched with the lower differential feeding tooth frame 502.

[0025] The rotation of the main feeding shaft 1 can drive the main feeding tooth structure 4 to move. The rotation angle of the main feeding shaft 1 determines the stroke of the main feeding tooth structure 4. Similarly, the rotation of the lower differential feeding shaft 2 can drive the lower differential feeding tooth structure 5 to move. The rotation angle of the lower differential feeding shaft 2 determines the stroke of the lower differential feeding tooth structure 5.

[0026] The adjustment driving structure 8 comprises the driving motor 801 and the double-rod crank 802 arranged on the driving motor 801. The double-rod crank 802 extends to both sides. One end is connected to the main feeding connecting rod 9 near the driving crank through the first transmission rod 803. The other end of the double-rod crank 802 is connected to the main feeding connecting rod 9 near the adjustment crank through the second transmission rod 804. The rotation of the driving motor 801 can drive the double-rod crank 802 to swing. The swing of the double-rod crank 802 can drive the main feeding connecting rod 9 to swing through the first and second transmission rods.

[0027] As preferred, the first transmission rod and the second transmission rod have the same length, and the double rod crank has the same length of extension to both ends. When the double rod crank is in the balanced state, i.e. left and right are in the same straight line, the main feeding connecting rod 9 is also at the same height, i.e. the distance between the first sliding block and the main feeding shaft is equal to the distance between the second sliding block and the lifting tooth shaft. The relative sliding position of the first sliding block and the second sliding block can be adjusted by driving the double rod crank 802 to swing.

[0028] The main feeding shaft 1 is provided with a driving structure for driving the main feeding shaft to rotate. The driving structure can be completely used in the prior art.

[0029] The driving structure drives the main feeding shaft 1 to rotate, and after the main feeding shaft rotates, the driving crank swings, and through the transmission of the main feeding connecting rod, the adjusting crank will swing, but the relative sliding position of the first and second sliding blocks can determine the rotation angle of the lifting tooth shaft.

[0030] For example, if the distance between the first sliding block and the main feeding shaft is greater than the distance between the second sliding block and the lifting tooth shaft, the main feeding shaft 1 rotates to drive the driving crank to swing, and through the transmission of the main feeding connecting rod 9, the adjusting crank will swing, and the swing amount is consistent. Since the distance between the second sliding block and the lifting tooth shaft is smaller, the rotation angle of the lifting tooth shaft is larger. The lower differential feeding connecting rod 10 is connected to the driven crank at one end, and the length of the driven crank is basically consistent with the length of the lower differential feeding connecting rod at the other end. Therefore, when the lifting tooth shaft rotates, the lower differential feeding connecting rod 10 transmits the rotation, and the rotation angle of the lower differential feeding shaft is basically consistent with the rotation angle of the lifting tooth shaft, which is larger than the rotation angle of the main feeding shaft, i.e. the lower differential feeding stroke is larger than the main feeding stroke.

[0031] If the distance between the first sliding block and the main feeding shaft is smaller than the distance between the second sliding block and the lifting tooth shaft, the main feeding shaft 1 rotates to drive the driving crank to swing, and through the transmission of the main feeding connecting rod 9, the adjusting crank will swing, and the swing amount is consistent. Since the distance between the second sliding block and the lifting tooth shaft is larger, the rotation angle of the lifting tooth shaft is smaller. The lower differential feeding connecting rod 10 is connected to the driven crank at one end, and the length of the driven crank is basically consistent with the length of the lower differential feeding connecting rod at the other end. Therefore, when the lifting tooth shaft rotates, the lower differential feeding connecting rod 10 transmits the rotation, and the rotation angle of the lower differential feeding shaft is basically consistent with the rotation angle of the lifting tooth shaft, which is smaller than the rotation angle of the main feeding shaft, i.e. the lower differential feeding stroke is smaller than the main feeding stroke.

[0032] The adjusting driving structure 8 has a simple structure, and is driven by a motor, which is faster and more convenient than manual adjustment, and is more accurate.

[0033] Further, one end of the lower differential feeding connecting rod 10 is adjustably arranged on the adjusting crank 301, and the second crank is provided with at least two adjusting holes 7 for connecting the lower differential feeding connecting rod 10. By adjusting the position of one end of the lower differential feeding connecting rod 10, the angle change of the lower differential feeding shaft can be changed, and the stroke difference between the lower differential feeding stroke and the main feeding stroke can be adjusted.

[0034] The main feeding connecting rod 9 is provided with a reset spring 12 between one end close to the driving crank 201 and the motor mounting plate 11 mounting the driving motor 801, so that the main feeding connecting rod 9 is reset, and the reset effect of the main feeding connecting rod 9 is better through simultaneous driving of the main feeding connecting rod 9 and the driving motor 801.

[0035] The above is only optional embodiments of the present application, and does not limit the patent range of the present application, and any equivalent structural transformation, direct / indirect application in other related technical fields under the inventive concept of the present application and according to the content of the present application are included in the patent protection range of the present application.

Claims

1. A differential feeding mechanism for a sewing machine, comprising a lower base plate and a main feeding shaft (1), a lower differential feeding shaft (2), and a tooth-lifting shaft (3) rotatably mounted on the lower base plate, wherein the lower differential feeding shaft (2) is movably sleeved on the main feeding shaft (1), and a main feeding tooth structure (4) is provided between the main feeding shaft (1) and the tooth-lifting shaft (3); a lower differential feeding tooth structure (5) is provided between the lower differential feeding shaft (2) and the tooth-lifting shaft (3), characterized in that: It also includes a differential adjustment structure (6), which includes a drive crank (201) on the main feed shaft (2), a driven crank (301) on the lower differential feed shaft (3), and an adjustment crank (301) on the tooth lifting shaft (3). A main feed connecting rod (9) is provided between the drive crank (201) and the adjustment crank (301). One end of the main feed connecting rod (9) is slidably connected to the drive crank (201) through a first slider (901), and the other end is slidably connected to the adjustment crank (301) through a second slider (902). The adjusting crank (301) is provided with a first crank (3011) for the second slider (902) to slide; a lower differential feeding link (10) is provided between the driven crank (201) and the adjusting crank (301), one end of the lower differential feeding link (10) is connected to the driven crank (201), and the other end is provided on the adjusting crank (401). The adjusting crank (301) is provided with a second crank (3012) for one end of the lower differential feeding link to be connected. It also includes an adjusting drive structure (8) for adjusting the relative sliding position of the first slider (901) and the second slider (902).

2. The differential feeding mechanism of the sewing machine as described in claim 1, characterized in that: The adjustment drive structure (8) includes a drive motor (801) and a double-bar crank (802) mounted on the drive motor (801). One end of the double-bar crank (802) is connected to the main feeding connecting rod (9) near the drive crank via a first transmission rod (803). The other end of the double-bar crank (802) is connected to the main feeding connecting rod (9) near the adjustment crank via a second transmission rod (804).

3. The differential feeding mechanism of the sewing machine as described in claim 1, characterized in that: The main feed tooth structure (4) includes a main feed tooth (401), a main feed tooth frame (402), a main feed tooth frame seat (403) on the main feed shaft (1), and a first shift fork (404) that cooperates with the main feed tooth frame (402) on the tooth lifting shaft (3).

4. The differential feeding mechanism of the sewing machine as described in claim 1, characterized in that: The lower differential feed tooth structure (5) includes a lower differential feed tooth (501), a lower differential feed tooth holder (502), and a lower differential feed tooth holder seat (503) provided on the lower differential feed shaft (2). The tooth lifting shaft (3) is provided with a second shift fork (504) that cooperates with the lower differential feed tooth holder (502).

5. The differential feeding mechanism of the sewing machine as described in claim 1, characterized in that: The main feeding shaft (1) is provided with a drive structure for driving the main feeding shaft to rotate.

6. The differential feeding mechanism of the sewing machine as described in claim 1, characterized in that: A return spring (12) is provided between the end of the main feeding connecting rod (9) near the drive crank (201) and the motor mounting plate (11) on which the drive motor (801) is installed.

7. The differential feeding mechanism of the sewing machine as described in claim 1, characterized in that: One end of the lower differential feeding link (10) is adjustablely mounted on the adjusting crank (301), and the second crank is provided with at least two adjusting holes (7) for the lower differential feeding link (10) to be connected.

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