Lower differential feed mechanism for a sewing machine

Abstract

The utility model provides a kind of sewing machine's lower differential feeding mechanism, including first tooth holder, first feeding tooth fixed on first tooth holder, further include driving motor, driving motor is connected with the one end of first tooth holder by feeding unit, feeding unit includes output crank, output connecting rod, transmission crank, electric drive cloth axle, first tooth holder crank, the one end of output crank is fixed on the output shaft of driving motor, the both ends of output connecting rod are respectively hinged with output crank and transmission crank, transmission crank and first tooth holder crank are respectively fixed on the both ends of electric drive cloth axle, first tooth holder is hinged with first tooth holder crank.The lower differential feeding mechanism of this sewing machine drives the movement of second feeding tooth by setting driving motor, the second needle pitch of second feeding tooth is adjusted by controlling the output of driving motor, and then differential needle pitch is conveniently adjusted, electronic adjustment is realized, adjustment is quick and efficient, structure is simple, small space is occupied, and cost is low.

Description

Technical Field

[0001] This utility model belongs to the field of sewing machine technology and relates to a differential feeding mechanism for a sewing machine. Background Technology

[0002] Differential sewing machines are divided into upper differential and lower differential. Their working principle is that during the rotation of the sewing machine, one of the needle and thread pressure plates above or below feeds the fabric forward in two separate actions, one faster and one slower, creating a pleated effect. This processing method is mainly used for partial decoration of clothing, such as the front of a skirt or the hem of a garment.

[0003] The lower differential sewing mechanism of a differential sewing machine mainly consists of two independently moving feed dogs. When the strokes of the two feed dogs are adjusted to be the same, the sewing effect is a smooth sewing; when the strokes of the two feed dogs are not adjusted to be different, the effect of pleating is achieved. During sewing, this eliminates the need for the sewing operator to manually push and pull the fabric, allowing them to easily perform pleating sewing without needing to learn the skills of manually pushing and pulling the fabric or having extensive sewing experience. Typically, the structure for implementing the lower differential function of a sewing machine is as follows: the feeding power of one set of feed dogs and feeders comes from the feeding mechanism in the sewing machine; the feeding power of the other set of feed dogs and feeders comes from the lifting mechanism of the sewing machine. Specifically, the lifting shaft in the lifting mechanism is connected to one feed dog via a differential linkage mechanism and is equipped with a manual adjustment mechanism. The manual adjustment mechanism acts on the differential linkage mechanism to change the transmission efficiency of the differential linkage mechanism, thereby achieving manual adjustment of the differential stitch length (i.e., differential feed amount). Therefore, existing sewing machines suffer from complex structures and inconvenient differential stitch length adjustment, especially the inability to adjust them when sewing is stopped midway. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in the prior art by providing a lower differential feeding mechanism for a sewing machine that allows for convenient adjustment of the differential stitch length.

[0005] The objective of this utility model can be achieved through the following technical solution: A differential feeding mechanism for a sewing machine includes a first feed dog, a first feed dog fixed on the first feed dog, and a drive motor. The drive motor is connected to one end of the first feed dog through a feeding unit. The feeding unit includes an output crank, an output connecting rod, a transmission crank, an electric drive feed shaft, and a first feed dog crank. One end of the output crank is fixed on the output shaft of the drive motor. The two ends of the output connecting rod are respectively hinged to the output crank and the transmission crank. The transmission crank and the first feed dog crank are respectively fixed to the two ends of the electric drive feed shaft. The first feed dog is hinged to the first feed dog crank.

[0006] In the differential feeding mechanism of the sewing machine described above, the drive motor drives the output crank to rotate, the output connecting rod and the transmission crank swing and drive the electric feed shaft and the first feed dog crank to rotate, so that the first feed dog and the first feed dog reciprocate back and forth to feed the material.

[0007] In the differential feeding mechanism of the sewing machine described above, the output end of the drive motor is located away from the first feed dog.

[0008] In the differential feeding mechanism of the sewing machine described above, a plurality of bearing seats are sleeved on the electric drive feeding shaft. The bearing seats are fixed to the bottom of the base plate, so that the electric drive feeding shaft is rotatably mounted below the base plate.

[0009] The differential feeding mechanism of the sewing machine described above also includes a second feeder arranged side by side with the first feeder, a feed shaft, and a second feed tooth fixed on the second feeder. The end of the feed shaft is fixed with a second feeder crank. The second feeder is hinged to the second feeder crank. The electrically driven feed shaft is parallel to the feed shaft.

[0010] Compared with existing technologies, the differential feeding mechanism of this sewing machine drives the movement of the second feed tooth by setting a drive motor, and adjusts the second stitch distance of the second feed tooth by controlling the output of the drive motor, thereby facilitating the adjustment of the differential stitch distance. It realizes electronic adjustment, which is quick and efficient, simple in structure, occupies little space, and has low cost. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural diagram of the differential feeding mechanism of this sewing machine.

[0012] Figure 2 This is a three-dimensional structural diagram of a portion of the differential feeding mechanism of this sewing machine.

[0013] In the diagram, 1. First feed tooth; 2. Second feed tooth; 3. First feed tooth; 4. Second feed tooth; 5. Feed shaft; 51. Second feed tooth crank; 6. Drive motor; 7. Feeding unit; 71. Output crank; 72. Output connecting rod; 73. Transmission crank; 74. Electric drive feed shaft; 75. First feed tooth crank; 76. Bearing housing; 8. Base plate. Detailed Implementation

[0014] 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.

[0015] like Figure 1 and Figure 2As shown, the differential feeding mechanism of this sewing machine includes a first feed dog 1, a first feed dog 3 fixed on the first feed dog 1, and a drive motor 6. The drive motor 6 is connected to one end of the first feed dog 1 through a feeding unit 7. The feeding unit 7 includes an output crank 71, an output connecting rod 72, a transmission crank 73, an electric feed shaft 74, and a first feed dog crank 75. One end of the output crank 71 is fixed to the output shaft of the drive motor 6. The two ends of the output connecting rod 72 are respectively hinged to the output crank 71 and the transmission crank 73. The transmission crank 73 and the first feed dog crank 75 are respectively fixed to the two ends of the electric feed shaft 74. The first feed dog 1 is hinged to the first feed dog crank 75.

[0016] The drive motor 6 drives the output crank 71 to rotate, the output connecting rod 72 and the transmission crank 73 swing and drive the electric drive feeding shaft 71 and the first tooth frame crank 75 to rotate, so that the first tooth frame 1 and the first feeding tooth 3 reciprocate back and forth to feed material.

[0017] In the above technical solution: the output end of the drive motor 6 is located away from the first tooth frame 1.

[0018] In the above technical solution: a plurality of bearing seats 76 are sleeved on the electric drive feeding shaft 74, and the bearing seats 76 are fixed to the bottom of the base plate 8, so that the electric drive feeding shaft 74 is rotatably installed under the base plate 8.

[0019] In the above technical solution: the drive motor 6 is preferably a stepper motor, which is easy to control, improves the adjustment accuracy of differential needle pitch, and is more intelligent.

[0020] The above technical solution also includes a second feeder 2 arranged parallel to the first feeder 1, a feed shaft 5, and a second feeder 4 fixed on the second feeder 2. The end of the feed shaft 5 is fixed with a second feeder crank 51, and the second feeder 2 is hinged to the second feeder crank 51. The electrically driven feed shaft 74 is parallel to the feed shaft 5.

[0021] During the sewing process, the feed shaft 5 rotates, driving the first feed dog 1 to reciprocate back and forth (the rotation of the feed shaft 5 is common knowledge in the art). The first feed dog 3 reciprocates back and forth synchronously with the first feed dog 1, performing the feeding action and having a first stitch pitch. The drive motor 6 drives the second feed dog 2 to reciprocate back and forth through the feed unit 7. The second feed dog 4 reciprocates back and forth synchronously with the second feed dog 2, performing the feeding action and having a second stitch pitch. The difference between the first stitch pitch and the second stitch pitch is the differential stitch pitch. When the second stitch pitch of the second feed dog 4 is equal to the first stitch pitch of the first feed dog 3, they feed synchronously; when the second stitch pitch of the second feed dog 4 is not equal to the first stitch pitch of the first feed dog 3, they feed differentially. By setting the drive motor 6 to drive the movement of the second feed tooth 4, and by controlling the output of the drive motor 6 to adjust the second needle pitch of the second feed tooth 4, the differential needle pitch can be easily adjusted, realizing electronic adjustment. The adjustment is quick and efficient, the structure is simple, the space occupied is small, and the cost is low.

[0022] 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 replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0023] Although this document frequently uses terms such as first feeder 1; second feeder 2; first feeder 3; second feeder 4; feed shaft 5; second feeder crank 51; drive motor 6; feed unit 7; output crank 71; output connecting rod 72; transmission crank 73; electric drive feed shaft 74; first feeder crank 75; bearing seat 76; base plate 8, etc., 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 kind of additional limitation would contradict the spirit of this utility model.

[0024] Contents not described in detail herein are existing technologies known to those skilled in the art. The specific embodiments described herein are merely illustrative examples illustrating the spirit of this invention. Those skilled in the art to which this invention 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 invention or exceeding the scope defined by the appended claims.

Claims

1. A differential feeding mechanism for a sewing machine, comprising a first feed dog (1) and a first feed dog (3) fixed on the first feed dog (1), characterized in that... It also includes a drive motor (6), which is connected to one end of the first tooth frame (1) through a feeding unit (7). The feeding unit (7) includes an output crank (71), an output connecting rod (72), a transmission crank (73), an electric drive feeding shaft (74), and a first tooth frame crank (75). One end of the output crank (71) is fixed on the output shaft of the drive motor (6). The two ends of the output connecting rod (72) are respectively hinged to the output crank (71) and the transmission crank (73). The transmission crank (73) and the first tooth frame crank (75) are respectively fixed to the two ends of the electric drive feeding shaft (74). The first tooth frame (1) is hinged to the first tooth frame crank (75). The drive motor (6) drives the output crank (71) to rotate, the output connecting rod (72) and the transmission crank (73) swing and drive the electric drive feeding shaft (74) and the first toothed crank (75) to rotate, so that the first toothed rod (1) and the first feeding tooth (3) reciprocate back and forth to feed material.

2. The differential feeding mechanism for a sewing machine according to claim 1, characterized in that... The output end of the drive motor (6) is located away from the first dental frame (1).

3. The differential feeding mechanism for a sewing machine according to claim 1, characterized in that... A plurality of bearing seats (76) are fitted on the electric drive feeding shaft (74), and the bearing seats (76) are fixed to the bottom of the base plate (8), so that the electric drive feeding shaft (74) is rotatably installed below the base plate (8).

4. The differential feeding mechanism for a sewing machine according to claim 1, characterized in that... It also includes a second toothed bracket (2) arranged side by side with the first toothed bracket (1), a feed shaft (5), and a second feed tooth (4) fixed on the second toothed bracket (2). The end of the feed shaft (5) is fixed with a second toothed bracket crank (51). The second toothed bracket (2) is hinged to the second toothed bracket crank (51). The electric feed shaft (74) is parallel to the feed shaft (5).

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