A sewing machine and its feed dog adjustment mechanism

Abstract

The present invention relates to a sewing machine and a feed dog adjustment mechanism thereof. When the sewing machine and the feed dog adjustment mechanism thereof are used for sewing operations and the operating rhythm of the sewing machine needs to be adjusted, the sliding block is slid along the sliding groove to disengage the meshing gear teeth from the fixed gear, and then the main shaft and the feed eccentric wheel are rotated relative to the tooth lifting eccentric wheel by a certain angle, so that the angle between the tooth lifting eccentric wheel and the feed eccentric wheel can be adjusted; then the sliding block is released, and the reset spring presses the sliding block toward the fixed gear to mesh the meshing gear teeth with the fixed gear; after the angle between the tooth lifting eccentric wheel and the feed eccentric wheel is adjusted, when the sewing machine performs sewing operations, the tooth lifting eccentric wheel and the feed eccentric wheel will move in a new phase relationship, and the sewing operation rhythm of the sewing machine can be adjusted.

Description

Technical Field

[0001] The invention relates to a sewing machine and a feed tooth adjusting mechanism thereof, belonging to the technical field of sewing machine manufacturing. Background Art

[0002] like Figure 1 As shown, the feed teeth of the existing feed mechanism are formed by the horizontal swing and the up-and-down lifting teeth to form a feed track similar to an ellipse. The lifting teeth eccentric wheel 3 that moves up and down is an integrated structure with the main shaft 1. The horizontal swing is composed of the feed eccentric wheel 3 fixed on the main shaft 1, which has an adjustable eccentricity and has a certain relative angle with respect to the lifting teeth eccentric wheel 3. The lifting teeth eccentric wheel 3 and the feed eccentric wheel 2 act on the feed teeth through the intermediate transmission parts to realize the fabric transportation and achieve the purpose of sewing. However, since the upper and lower lifting teeth eccentric wheels 3 of the current sewing machine are an integrated structure with the main shaft 1, their angles are fixed, so it is impossible to change the phase of the lifting teeth eccentric wheel, and it is impossible to change the phase relationship between the embroidery and the feeding of the fabric. In view of the improvement of the current sewing process requirements, this lifting teeth eccentric wheel structure can no longer fully meet the sewing of different types of fabrics in the market. It is easy to cause sewing defects such as the upper and lower layers of fabric being misaligned, the same machine cannot meet the knitting and weaving requirements at the same time, the fabric is not wrinkled, or the feeding efficiency is low. Therefore, this cloth feeding mechanism cannot adjust the tooth lifting angle of the cloth feeding track during use, and its application range is relatively narrow. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a sewing machine and a feed dog adjustment mechanism thereof, which can conveniently adjust the operating rhythm of the sewing machine.

[0004] To achieve the above-mentioned purpose, the present invention provides a feed dog adjustment mechanism of a sewing machine, which adopts the following technical scheme: a feed dog adjustment mechanism of a sewing machine, comprising a main shaft, a feed eccentric wheel and a tooth-lifting eccentric wheel connected to the main shaft, the main shaft is driven by a driving mechanism to drive the feed eccentric wheel and the tooth-lifting eccentric wheel to rotate; the tooth-lifting eccentric wheel is used to drive the feed dog to reciprocate up and down, and the feed eccentric wheel is used to drive the feed dog to reciprocate along the feeding direction; the tooth-lifting eccentric wheel is fixed on a first side surface of a connecting disk, the connecting disk and the tooth-lifting eccentric wheel are rotatably mounted on the main shaft, a sliding groove is provided on the second side surface of the connecting disk, a sliding block is connected in the sliding groove, and a section of meshing gear teeth is provided on the sliding block; a fixed gear is connected to the main shaft, the sliding block is connected to a reset spring, and the reset spring presses the sliding block toward the fixed gear to make the meshing gear teeth mesh with the fixed gear.

[0005] Preferably, it also includes an adjustment button, on which is provided a pressing column, with the end of the pressing column aligned with one end of the sliding block; when the adjustment button is pressed, the pressing column abuts against the sliding block and pushes the sliding block to move along the sliding groove, thereby causing the meshing gear teeth to disengage from the fixed gear; when the adjustment button is released, the return spring drives the sliding block to press against the fixed gear to cause the meshing gear teeth to mesh with the fixed gear.

[0006] More preferably, the end of the sliding block opposite to the connecting column has an arc surface.

[0007] Preferably, the sliding block is provided with a long slot hole, and the main shaft passes through the long slot hole.

[0008] Preferably, the connecting disk is provided with two connecting columns perpendicular to the connecting disk, the two connecting columns are respectively located on both sides of the slide groove, the reset spring is a tension spring, and the two ends of the reset spring are respectively connected to the two connecting columns; the sliding block is provided with a connecting groove, and the reset spring is tightened in the connecting groove.

[0009] More preferably, the fixed gear is provided with a limiting column extending along its radial direction, and the limiting column is located between the two connecting columns.

[0010] Preferably, the tooth-lifting eccentric wheel and the connecting disk are an integral structure.

[0011] Preferably, a positioning groove is provided on the connecting plate, and when the adjusting button is pressed, a part of the pressing column is stuck in the positioning groove, and the other part is pressed on the sliding block.

[0012] Preferably, the upper end of the pressing column is connected to a pressing plate, a compression spring is sleeved on the pressing column, the upper end of the compression spring is against the lower surface of the pressing plate, and the lower end of the compression spring is against the frame.

[0013] Corresponding to the feed dog adjusting mechanism of a sewing machine of the present invention, the present invention also provides a sewing machine, comprising the feed dog adjusting mechanism of a sewing machine described in the above technical solution or any preferred technical solution thereof.

[0014] As described above, the sewing machine and its feed dog adjustment mechanism of the present invention have the following beneficial effects: when the sewing machine and its feed dog adjustment mechanism of the present invention are used for sewing operations, when the operating rhythm of the sewing machine needs to be adjusted, the sliding block is slid along the sliding groove to disengage the meshing gear from the fixed gear, and then the main shaft and the feed eccentric wheel are rotated relative to the tooth lifting eccentric wheel by a certain angle, so that the angle between the tooth lifting eccentric wheel and the feed eccentric wheel can be adjusted; then the sliding block is released, and the reset spring presses the sliding block toward the fixed gear to mesh the meshing gear with the fixed gear; after adjusting the angle between the tooth lifting eccentric wheel and the feed eccentric wheel, when the sewing machine is performing sewing operations, the tooth lifting eccentric wheel and the feed eccentric wheel will move in a new phase relationship, and the sewing operation rhythm of the sewing machine will be adjusted. The sewing machine of the present invention certainly also has the above beneficial effects, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the feed dog adjustment mechanism in the prior art.

[0016] Figure 2 Shown is a structural schematic diagram of a feed dog adjustment structure of a sewing machine of the present invention, wherein a compression spring and a frame are not shown.

[0017] Figure 3 Shown is a structural schematic diagram of a feed dog adjustment structure of a sewing machine according to the present invention.

[0018] Figure 4 Shown is a schematic diagram of the structure of the connecting plate and the tooth-lifting eccentric wheel.

[0019] Figure 5 A schematic diagram of the structure displayed as a slider.

[0020] Component number description

[0021] 1 Spindle

[0022] 2 Feed eccentric wheel

[0023] 3. Eccentric wheel for lifting teeth

[0024] 4 Connection plate

[0025] 5 First side

[0026] 6 Second side

[0027] 7 Chute

[0028] 8 Sliders

[0029] 9 Meshing teeth

[0030] 10 Fixed gear

[0031] 11 Return spring

[0032] 12 Adjustment buttons

[0033] 13 Press column

[0034] 14 Arc surface

[0035] 15 Long slot hole

[0036] 16 Connecting column

[0037] 17 Connection slot

[0038] 18 Limit column

[0039] 19 Positioning slot

[0040] 20 Press Plate

[0041] 21 Compression spring

[0042] 22 Rack DETAILED DESCRIPTION

[0043] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0044] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0045] like Figure 2 and Figure 3As shown, the present invention provides a feed dog adjustment mechanism of a sewing machine, comprising a main shaft 1, a feed eccentric wheel 2 and a tooth lifting eccentric wheel 3 connected to the main shaft 1, the main shaft 1 is driven by a driving mechanism to drive the feed eccentric wheel 2 and the tooth lifting eccentric wheel 3 to rotate; the tooth lifting eccentric wheel 3 is used to drive the feed dog to reciprocate up and down, and the feed eccentric wheel 2 is used to drive the feed dog to reciprocate along the feeding direction; the tooth lifting eccentric wheel 3 is fixed on a first side surface 5 of a connecting disk 4, the connecting disk 4 and the tooth lifting eccentric wheel 3 are rotatably mounted on the main shaft 1, a slide groove 7 is provided on the second side surface 6 of the connecting disk 4, a sliding block 8 is connected in the slide groove 7, and a section of meshing gear teeth 9 is provided on the sliding block 8; a fixed gear 10 is connected to the main shaft 1, the sliding block 8 is connected to a reset spring 11, and the reset spring 11 presses the sliding block 8 toward the fixed gear 10 to make the meshing gear teeth 9 mesh with the fixed gear 10.

[0046] When the feed dog adjustment mechanism of a sewing machine of the present invention is used for sewing operation, if the sewing machine operation rhythm needs to be adjusted, please refer to Figure 3 , slide the sliding block 8 along the sliding groove 7 to disengage the meshing gear 9 from the fixed gear 10, and then rotate the main shaft 1 and the cloth feeding eccentric wheel 2 relative to the tooth lifting eccentric wheel 3 by a certain angle, so that the angle between the tooth lifting eccentric wheel 3 and the cloth feeding eccentric wheel 2 can be adjusted; then release the sliding block 8, the reset spring 11 will press the sliding block 8 to the fixed gear 10 to make the meshing gear 9 mesh with the fixed gear 10; after adjusting the angle between the tooth lifting eccentric wheel 3 and the cloth feeding eccentric wheel 2, when the sewing machine performs sewing operation, the tooth lifting eccentric wheel 3 and the cloth feeding eccentric wheel 2 will move in a new phase relationship, and the sewing operation rhythm of the sewing machine will be adjusted.

[0047] In a feed dog adjustment mechanism of a sewing machine of the present invention, by adjusting the angle between the tooth lifting eccentric wheel 3 and the feed eccentric wheel 2, the motion phase relationship between the tooth lifting eccentric wheel 3 and the feed eccentric wheel 2 can be adjusted, thereby adjusting the operation rhythm of the sewing machine. The tooth lifting eccentric wheel 3 is connected to the connecting plate 4, such as Figure 4 As shown, as a preferred embodiment, the tooth lifting eccentric wheel 3 and the connecting disk 4 are an integrated structure, the tooth lifting eccentric wheel 3 is connected to the first side surface 5 of the connecting disk 4, and the slide groove 7 is arranged on the second side surface 6 of the connecting disk 4. Of course, the tooth lifting eccentric wheel 3 and the connecting disk 4 can also be arranged separately, and then the two are fixedly installed together.

[0048] When adjusting the angle between the tooth lifting eccentric wheel 3 and the cloth feeding eccentric wheel 2, the tooth lifting eccentric wheel 3 remains stationary, and the main shaft 1 is rotated to make the main shaft 1 and the cloth feeding eccentric wheel 2 rotate together, thereby adjusting the angle between the tooth lifting eccentric wheel 3 and the cloth feeding eccentric wheel 2. As a preferred embodiment, Figure 3As shown, a sewing machine and its feed dog adjustment mechanism of the present invention also include an adjustment button 12, on which a pressing column 13 is provided, and the end of the pressing column 13 is aligned with one end of the sliding block 8; when the adjustment button 12 is pressed, the pressing column 13 abuts on the sliding block 8 and pushes the sliding block 8 to move along the sliding groove 7, so that the meshing gear 9 is disengaged from the fixed gear 10; when the meshing gear 9 is disengaged from the fixed gear 10, the main shaft 1 can rotate relative to the tooth lifting eccentric wheel 3 and the connecting disk 4, at this time, the main shaft 1 can be rotated to adjust the angle between the feed eccentric wheel 2 and the tooth lifting eccentric wheel 3; when the angle between the feed eccentric wheel 2 and the tooth lifting eccentric wheel 3 is adjusted to a set value, the adjustment button 12 is released, and the reset spring 11 drives the sliding block 8 to press against the fixed gear 10 to make the meshing gear 9 mesh with the fixed gear 10, at this time, the tooth lifting eccentric wheel 3 cannot rotate relative to the main shaft 1. In order to make the pressing column 13 and the sliding block 8 have good contact, preferably, the sliding block 8 has an arc surface 14 at one end opposite to the connecting column 16. When the adjustment button 12 is pressed, the lower end of the pressing column 13 abuts against the arc surface 14.

[0049] As mentioned above, when adjusting the angle between the tooth lifting eccentric wheel 3 and the cloth feeding eccentric wheel 2, the tooth lifting eccentric wheel 3 remains stationary, and the main shaft 1 is rotated to make the main shaft 1 and the cloth feeding eccentric wheel 2 rotate together, thereby adjusting the angle between the tooth lifting eccentric wheel 3 and the cloth feeding eccentric wheel 2. As a preferred embodiment, Figure 4 As shown, the connection plate 4 is provided with a positioning groove 19, please refer to Figure 3 The axis of the pressing column 13 basically coincides with the second side surface 6 of the connecting disk 4. When the adjusting button 12 is pressed, a part of the pressing column 13 is stuck in the positioning groove 19, thereby preventing the connecting disk 4 and the tooth-lifting eccentric wheel 3 from rotating, and another part of the pressing column 13 is pressed on the sliding block 8, thereby causing the sliding block 8 to move downward, the meshing gear 9 is disengaged from the fixed gear 10, and the main shaft 1 and the cloth feeding eccentric wheel 2 can rotate relative to the tooth-lifting eccentric wheel 3.

[0050] When adjusting the angle between the tooth lifting eccentric wheel 3 and the cloth feeding eccentric wheel 2, the sliding block 8 can be pressed by adjusting the button 12, so that the sliding block 8 moves in the sliding groove 7. As a preferred embodiment, Figure 5 As shown, the sliding block 8 is provided with a long slot hole 15, please refer to Figure 3 The rotating shaft passes through the long slot hole 15, and the sliding block 8 is symmetrical in shape. The left and right sides of the sliding block 8 are slidably matched with the left and right side walls of the sliding groove 7.

[0051] In a feed dog adjustment mechanism of a sewing machine of the present invention, a return spring 11 is connected to the sliding block 8. Under the action of the return spring 11, the return spring 11 presses the meshing gear 9 on the sliding block 8 and the fixed gear 10 to mesh together. When the adjustment button 12 is pressed, the meshing gear 9 is separated from the fixed gear 10. When the adjustment button 12 is released, the return spring 11 presses the meshing gear 9 toward the fixed gear 10. As a preferred embodiment, Figure 3 As shown, the connecting plate 4 is provided with two connecting posts 16 perpendicular to the connecting plate 4, the two connecting posts 16 are respectively located on both sides of the slide slot 7, the reset spring 11 is a tension spring, and the two ends of the reset spring 11 are respectively connected to the two connecting posts 16; please refer to Figure 3 and Figure 5 , a connecting groove 17 is provided on the sliding block 8, and the return spring 11 is tightened in the connecting groove 17. The return spring 11 is in a stretched state, and the return spring 11 pushes the meshing gear 9 on the sliding block 8 toward the fixed gear 10.

[0052] When adjusting the angle between the tooth lifting eccentric wheel 3 and the cloth feeding eccentric wheel 2, in order to prevent the main shaft 1 from rotating too much relative to the tooth lifting eccentric wheel 3, it is necessary to limit the rotation range of the main shaft 1 relative to the tooth lifting eccentric wheel 3. Figure 3 As shown, the fixed gear 10 is provided with a limit column 18 extending along its radial direction, and the limit column 18 is located between the two connecting columns 16. In this way, the limit column 18 can only rotate between the two connecting columns 16, thereby limiting the rotation range of the main shaft 1 relative to the tooth lifting eccentric wheel 3.

[0053] In the feed dog adjustment mechanism of a sewing machine of the present invention, the pressing column 13 can be moved up and down by pressing the adjustment button 12. After releasing the adjustment button 12, the pressing column 13 returns to its original position. Figure 3 As shown, as a preferred embodiment, the upper end of the pressing column 13 is connected to a pressing plate 20, and a compression spring 21 is sleeved on the pressing column 13. The upper end of the compression spring 21 presses against the lower surface of the pressing plate 20, and the lower end of the compression spring 21 presses against the frame 22. In this way, when the adjustment button 12 is released, the compression spring 21 will push the pressing plate 20 upward, so that the adjustment button 12 is reset.

[0054] Corresponding to the feed dog adjusting mechanism of a sewing machine of the present invention, the present invention also provides a sewing machine, comprising the feed dog adjusting mechanism of a sewing machine described in the above technical solution or any preferred technical solution thereof.

[0055] Based on the technical solutions of the above-mentioned embodiments, the feed dog adjustment mechanism of a sewing machine of the present invention can conveniently adjust the relative angle between the feed eccentric wheel 2 and the lifting tooth eccentric wheel 3, thereby adjusting the motion phase of the two, so that the sewing operation rhythm of the sewing machine can be adjusted. The feed dog adjustment mechanism of a sewing machine of the present invention can easily, quickly and accurately adjust the phase of the upper and lower lifting teeth eccentricity of the feed dog relative to the main shaft 1, and the mechanism is simple, and it is easy to adjust the upper and lower lifting teeth eccentricity of the feed dog without replacing the main shaft 1, and realize the phase relationship between different lifting teeth and piercing the cloth or swinging back and forth, effectively improving the above sewing defects. The sewing machine of the present invention includes the feed dog adjustment mechanism of a sewing machine of the present invention, which of course also has the above-mentioned technical effects, which will not be repeated here.

[0056] In summary, the present invention effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0057] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A feed dog adjustment mechanism for a sewing machine, comprising a main shaft (1), a feed eccentric wheel (2) and a tooth lifting eccentric wheel (3) connected to the main shaft (1), wherein the main shaft (1) is driven by a driving mechanism to drive the feed eccentric wheel (2) and the tooth lifting eccentric wheel (3) to rotate; the tooth lifting eccentric wheel (3) is used to drive the feed dog to reciprocate up and down, and the feed eccentric wheel (2) is used to drive the feed dog to reciprocate along the feeding direction; Its characteristics are: The tooth-lifting eccentric wheel (3) is fixed on a first side surface (5) of a connecting plate (4); the connecting plate (4) and the tooth-lifting eccentric wheel (3) are rotatably mounted on the main shaft (1); a sliding groove (7) is provided on the second side surface (6) of the connecting plate (4); a sliding block (8) is connected to the sliding groove (7); a section of meshing gear teeth (9) is provided on the sliding block (8); a fixed gear (10) is connected to the main shaft (1); the sliding block (8) is connected to a return spring (11); the return spring (11) presses the sliding block (8) toward the fixed gear (10) so that the meshing gear teeth (9) mesh with the fixed gear (10); An adjusting button (12) is provided on the adjusting button (12), and an end of the pressing column (13) is aligned with one end of the sliding block (8); when the adjusting button (12) is pressed, the pressing column (13) abuts against the sliding block (8) and pushes the sliding block (8) to move along the sliding groove (7), thereby causing the meshing gear (9) to disengage from the fixed gear (10); when the adjusting button (12) is released, the return spring (11) drives the sliding block (8) to press against the fixed gear (10), thereby causing the meshing gear (9) to mesh with the fixed gear (10), wherein the sliding block (8) is provided with a long slot hole (15), and the main shaft (1) passes through the long slot hole (15).

2. The feed dog adjustment mechanism for a sewing machine according to claim 1, Features: The end of the sliding block (8) opposite to the connecting column (16) has an arc surface (14).

3. The feed dog adjustment mechanism for a sewing machine according to claim 1, Features: The connecting disk (4) is provided with two connecting columns (16) perpendicular to the connecting disk (4), and the two connecting columns (16) are respectively located on both sides of the sliding groove (7); the return spring (11) is a tension spring, and the two ends of the return spring (11) are respectively connected to the two connecting columns (16); the sliding block (8) is provided with a connecting groove (17), and the return spring (11) is tightened in the connecting groove (17).

4. The feed dog adjustment mechanism for a sewing machine according to claim 3, Features: The fixed gear (10) is provided with a limiting column (18) extending in its radial direction, and the limiting column (18) is located between the two connecting columns (16).

5. The feed dog adjustment mechanism for a sewing machine according to claim 1, Features: The tooth-lifting eccentric wheel (3) and the connecting plate (4) are an integrated structure.

6. The feed dog adjustment mechanism for a sewing machine according to claim 1, Features: The connection plate (4) is provided with a positioning groove (19). When the adjustment button (12) is pressed, a part of the pressing column (13) is stuck in the positioning groove (19) and the other part is pressed on the sliding block (8).

7. The feed dog adjustment mechanism for a sewing machine according to claim 1, Features: The upper end of the pressing column (13) is connected to a pressing plate (20), and a compression spring (21) is sleeved on the pressing column (13). The upper end of the compression spring (21) is pressed against the lower surface of the pressing plate (20), and the lower end of the compression spring (21) is pressed against the frame (22).

8. A sewing machine, Its characteristics are: A feed dog adjustment mechanism for a sewing machine comprising any one of claims 1 to 7.

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