A rectangular track feeding mechanism on a sewing machine

Abstract

The present invention discloses a rectangular track feeding mechanism for a sewing machine, comprising a spindle motor, a spindle, a feed horizontal swing assembly, and a feed up and down swing assembly; the feed up and down swing assembly comprises a vertical shaft gear pair assembly, a transmission shaft, a cylindrical gear pair, a tooth lifting shaft, and a tooth fork crank; the cylindrical gear pair comprises a large gear and a small gear; the large gear is provided with a track cam, and the tooth lifting shaft is provided with a tooth lifting crank; the track cam has a feed dog lifting area, a feed dog diving area, and an up and down switching transition damping area; the track cam cooperates with the tooth lifting crank through each area and converts it into a periodic swing of the tooth lifting shaft, thereby causing the feed assembly connected to the tooth fork crank to move up and down, and cooperates with the swing of the feed horizontal swing assembly to realize a rectangular track motion of the feed dog motion trajectory. The structure designed by the present invention can perform rectangular track sewing, and the structure has stable feeding and excellent sewing performance for multi-layer sewing materials, meeting higher customer demands.

Description

Technical Field

[0001] The invention relates to the technical field of sewing machines, and in particular to a rectangular track feeding mechanism on a sewing machine. Background Art

[0002] The feeding track of traditional sewing machines is elliptical, which is not ideal for feeding when there are too many layers of sewing material, and is prone to causing defects such as wrinkles and uneven stitch lengths. In market applications, users have higher requirements for sewing quality, so improvements are needed to meet the market demand for high sewing quality. Summary of the Invention

[0003] The purpose of the present invention is to solve the problems raised in the above background technology and to provide a rectangular track feeding mechanism for a sewing machine.

[0004] In order to solve the above technical problems, the technical solution of the present invention is as follows: a rectangular track feeding mechanism on a sewing machine, comprising a spindle motor, a spindle, a feeding horizontal swing assembly, and a feeding up and down swing assembly. The feeding horizontal swing assembly comprises an eccentric wheel rod assembly, a feeding shaft, and a feeding assembly; the feeding up and down swing assembly comprises a vertical axis gear pair assembly, a transmission shaft, a cylindrical gear pair, a tooth lifting shaft, and a tooth fork crank. The vertical axis gear pair assembly enables the spindle and the transmission shaft to form a transmission connection. The cylindrical gear pair comprises a large gear and a small gear. The large gear is provided with There is a track cam, and a tooth-lifting crank is provided on the tooth-lifting shaft. One end of the tooth-lifting crank is fixed to the tooth-lifting shaft, and the other end rests on the track cam. The tooth fork crank is connected to the feeding assembly; the track cam has a feed dog lifting area, a feed dog diving area, and an up and down switching transition damping area. The track cam cooperates with the tooth-lifting crank through each area and converts it into a periodic swing of the tooth-lifting shaft, so that the feeding assembly connected to the tooth fork crank moves up and down, and cooperates with the swing of the feeding horizontal swing assembly to realize the track motion of the feed dog in a rectangular shape.

[0005] In the rectangular track feeding mechanism on the above-mentioned sewing machine, a threaded hole is provided on the track cam, and the track cam is fixedly connected to the large gear through the threaded hole and abuts against the tooth lifting crank.

[0006] In the rectangular track feeding mechanism on the above-mentioned sewing machine, the large gear is installed with the sewing machine housing through the eccentric shaft, and the large gear is rotatably installed on the eccentric shaft and meshes with the small gear fixed on the transmission shaft for transmission.

[0007] In the rectangular track feeding mechanism on the above-mentioned sewing machine, a bearing is installed on the tooth lifting crank and is hinged through a pin, and the pin is fixed to the tooth lifting crank by a screw.

[0008] In the above-mentioned rectangular track feeding mechanism on a sewing machine, the eccentric shaft is provided with an eccentric structure, the outer circles of the two shaft ends are concentric structures, the axis of the outer circle of the middle section is parallel to the axis of the outer circles of the two shaft ends but not concentric, and the large gear of the cylindrical gear pair is installed in the middle section of the eccentric shaft.

[0009] In the rectangular track feeding mechanism on the above-mentioned sewing machine, the number of teeth on the large gear is twice the number of teeth on the small gear.

[0010] In the rectangular track feeding mechanism on the above-mentioned sewing machine, the cylindrical gear pair is in the form of cylindrical spur gears, but is not limited to this form of gear pair.

[0011] In the rectangular track feeding mechanism on the above-mentioned sewing machine, the vertical shaft gear pair assembly includes a vertical shaft, a main shaft gear pair, and a transmission shaft gear pair. The vertical shaft forms a transmission connection between the main shaft and the transmission shaft through the gear pairs at both ends of the vertical shaft.

[0012] The beneficial effects of the present invention are:

[0013] The present invention realizes the periodic swing of the tooth lifting shaft by cooperating with the track cam and the tooth lifting crank through the arrangement, so that the feeding assembly connected to the tooth fork crank moves up and down, and cooperates with the swing of the feeding horizontal swing assembly to realize the rectangular track motion of the feed dog; the designed structure can perform rectangular track sewing, and the structure has stable feeding and excellent multi-layer sewing performance, which meets the higher needs of customers. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the present invention;

[0015] Figure 2 This is a structural diagram of the feeding up and down swinging assembly in the present invention;

[0016] Figure 3 It is a planar structural diagram of the track cam in the present invention;

[0017] Figure 4 It is a three-dimensional diagram of the tooth lifting crank in the present invention;

[0018] Figure 5 It is a three-dimensional diagram of the eccentric shaft in the present invention;

[0019] Figure 6 It is a stereoscopic diagram of the cooperation between the tooth lifting crank and the cylindrical gear pair in the present invention. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; in the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] See also Figures 1 to 6 The present invention provides a main shaft motor, an upper shaft connected to the main shaft motor, and a feeding horizontal swing component and a feeding upper and lower swing component connected to the upper shaft.

[0023] A rectangular track feeding mechanism on a sewing machine includes a spindle motor 1, a spindle 2 connected to the spindle motor 1, and a feeding horizontal swing assembly 3 and a feeding up and down swing assembly 4 connected to the spindle 2. The feeding horizontal swing assembly 3 includes an eccentric wheel rod assembly 5, a feeding shaft 6, and a feeding assembly 7. The spindle 2 and the feeding shaft 6 are installed on the casing of the sewing machine, wherein the feeding step tooth 21 is connected to the feeding assembly 7; the feeding up and down swing assembly 4 includes a vertical shaft gear pair assembly 8, a transmission shaft 9, a cylindrical gear pair 10, a tooth lifting shaft 11, and a tooth fork crank 12. The transmission shaft 9 and the tooth lifting shaft 11 are installed on the casing of the sewing machine. The vertical shaft gear pair assembly 8 includes a vertical shaft 8-1, a spindle gear pair 8-2, and a transmission shaft gear pair 8-3. The vertical shaft 8-1 forms a transmission connection between the spindle 2 and the transmission shaft 9 through the gear pairs at its two ends.

[0024] The cylindrical gear pair 10 includes a large gear 10-1 and a small gear 10-2. The cylindrical gear pair 10 is in the form of a cylindrical spur gear, but is not limited to this form of gear pair. It can also be other forms of gears such as cylindrical helical gears, wherein the number of teeth of the large gear 10-1 is twice the number of teeth of the small gear 10-2; the large gear is installed with the sewing machine housing through the eccentric shaft 16, and the large gear 10-1 is rotatably installed on the eccentric shaft 16 and meshes with the small gear 10-2 fixed on the transmission shaft 9 for transmission.

[0025] The large gear 10-1 is provided with a track cam 13, and the tooth lifting shaft 11 is provided with a tooth lifting crank 14. One end of the tooth lifting crank 14 is fixed to the tooth lifting shaft 11 and the other end is against the track cam 13. The tooth fork crank 12 is connected to the feeding assembly 7; the track cam 13 has a feed dog lifting area 131, a feed dog diving area 132, and an upper and lower switching transition damping area 133. At the same time, a threaded hole 134 is provided on the track cam 13. The track cam 13 is fixedly connected to the large gear 10-1 through the threaded hole 134 and is against the tooth lifting crank 14 accordingly.

[0026] During operation, the track cam 13 is converted into a periodic swing of the tooth lifting shaft 11 through the cooperation of the feed dog lifting area 131, the feed dog diving area 132, the up and down switching transition damping area 133 and the tooth lifting crank 14, thereby causing the feeding assembly 7 connected to the tooth fork crank 12 to move up and down, and cooperate with the swing of the feeding horizontal swing assembly 3 to realize the rectangular trajectory of the feed dog 15.

[0027] Furthermore, a bearing 17 is installed on the tooth lifting crank 14 and is hinged through a pin 18. The pin 18 is fixed to the tooth lifting crank 14 by a screw 19, thereby reducing the abutting friction between the tooth lifting crank 14 and the track cam 13.

[0028] Furthermore, the eccentric shaft 16 is provided with an eccentric structure, the outer circles of the two shaft ends 161 are concentric structures, the axis of the outer circle of the middle section 162 is parallel to the axis of the outer circles of the two shaft ends 161 but not concentric, and the large gear 10-1 of the cylindrical gear pair 10 is installed at the middle section of the eccentric shaft 16, so that the center distance of the gears in the cylindrical gear pair 10 and the gear bonding tooth gap can be adjusted by adjusting the angle of the eccentric shaft 16, thereby achieving the most ideal gear pair operating state.

[0029] The above is a detailed introduction to the rectangular track feeding mechanism on a sewing machine provided by an embodiment of the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the technical solutions disclosed by the present invention. At the same time, for general technical users in this field, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation of the present invention.

Claims

1. A rectangular track feeding mechanism for a sewing machine, comprising a spindle motor (1), a spindle (2), a feeding horizontal swing assembly (3), and a feeding up and down swing assembly (4), wherein the feeding horizontal swing assembly (3) comprises an eccentric wheel rod assembly (5), a feeding shaft (6), and a feeding assembly (7); characterized in that: The feeding up and down swinging assembly (4) includes a vertical shaft gear pair assembly (8), a transmission shaft (9), a cylindrical gear pair (10), a tooth lifting shaft (11), and a tooth fork crank (12). The vertical shaft gear pair assembly (8) enables the main shaft (2) and the transmission shaft (9) to form a transmission connection. The cylindrical gear pair (10) includes a large gear (10-1) and a small gear (10-2). The large gear (10-1) is provided with a track cam (13). The tooth lifting shaft (11) is provided with a tooth lifting crank (14). One end of the tooth lifting crank (14) is fixed to the tooth lifting shaft (11), and the other end is against On the track cam (13), the tooth fork crank (12) is connected to the feeding assembly (7); the track cam (13) has a feed dog lifting area (131), a feed dog diving area (132), and an up and down switching transition damping area (133); the track cam (13) cooperates with the tooth lifting crank (14) in each area and converts it into a periodic swing of the tooth lifting shaft (11), so that the feeding assembly (7) connected to the tooth fork crank (12) moves up and down, and cooperates with the swing of the feeding horizontal swing assembly (3) to realize the track motion of the feed dog (15) in a rectangular shape; The large gear (10-1) is mounted on the sewing machine housing via an eccentric shaft (16), and the large gear (10-1) is rotatably mounted on the eccentric shaft (16) and meshes with a small gear (10-2) fixed on the transmission shaft (9). The vertical shaft gear pair assembly (8) comprises a vertical shaft (8-1), a main shaft gear pair (8-2), and a transmission shaft gear pair (8-3). The vertical shaft (8-1) forms a transmission connection between the main shaft (2) and the transmission shaft (9) through the gear pairs at both ends of the vertical shaft (8-1).

2. The rectangular track feeding mechanism for a sewing machine according to claim 1, characterized in that: A threaded hole (134) is provided on the track cam (13), and the track cam (13) is fixedly connected to the large gear (10-1) through the threaded hole (134) and abuts against the tooth lifting crank (14).

3. A rectangular track feeding mechanism for a sewing machine according to claim 1 or 2, characterized in that: The tooth lifting crank (14) is provided with a bearing (17) and is hinged via a pin (18), and the pin (18) is fixed to the tooth lifting crank (14) via a screw (19).

4. The rectangular track feeding mechanism for a sewing machine according to claim 1, characterized in that: The eccentric shaft (16) is provided with an eccentric structure, the outer circles of the two shaft ends (161) are concentric structures, the axis of the outer circle of the middle section (162) is parallel to the axes of the outer circles of the two shaft ends (161) but not concentric, and the large gear (10-1) of the cylindrical gear pair (10) is installed at the middle section (162) of the eccentric shaft (16).

5. The rectangular track feeding mechanism for a sewing machine according to claim 1, characterized in that: The number of teeth of the large gear (10-1) is twice the number of teeth of the small gear (10-2).

6. The rectangular track feeding mechanism for a sewing machine according to claim 1, characterized in that: The cylindrical gear pair (10) is in the form of cylindrical spur gears, but is not limited to this form of gear pair.

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