Needle length adjusting device and sewing machine having the same

Abstract

The present invention provides a stitch length adjustment device and a sewing machine having the same. The stitch length adjustment device comprises: a drive structure; a presser foot, a drive end of the drive structure being connected to the presser foot so as to drive the presser foot to be raised or lowered by the drive structure; and a feed regulator, a drive end of the drive structure being connected to the feed regulator so as to adjust the position of the feed regulator to adjust the stitch length. The technical solution provided by the present invention can solve the technical problem of the inconvenience of stitch length adjustment in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of sewing machines, and in particular to a stitch length adjusting device and a sewing machine having the same. Background Art

[0002] Currently, a sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the material to interweave or sew one or more layers of material. The stitch adjustment device on the sewing machine is used to raise and lower the presser foot. By raising and lowering the stitch adjustment device, the sewing thread is passed through the fabric to achieve the stitching.

[0003] In the prior art, the stitch length of a sewing machine is generally adjusted manually. An adjustment button is provided on the sewing machine, and the stitch length is adjusted by adjusting the button before sewing begins.

[0004] However, the adjustment button in the prior art cannot adjust the stitch length during sewing, thus causing inconvenience in operation. Summary of the Invention

[0005] The main purpose of the present invention is to provide a needle distance adjustment device and a sewing machine having the same, so as to solve the technical problem of inconvenience in adjusting the needle distance in the prior art.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a needle length adjustment device is provided, including: a driving structure; a presser foot, the driving end of the driving structure is connected to the presser foot, so as to drive the presser foot to be lifted or dropped through the driving structure; a feed regulator, the driving end of the driving structure is connected to the feed regulator, so as to adjust the position of the feed regulator through the driving structure to adjust the needle length.

[0007] Furthermore, the needle length adjustment device also includes: a first transmission structure, which is connected to the driving end of the driving structure, at least part of the first transmission structure is used to abut against the adjustment surface of the feed adjuster to drive the feed adjuster to rotate, and the driving structure drives the first transmission structure to move to adjust the needle length by adjusting the rotation angle of the feed adjuster.

[0008] Furthermore, a first gear is provided at the driving end of the driving structure, and the first transmission structure is a rack. The end of the rack is used to abut against the adjustment surface of the feed regulator. The first gear is engaged with the rack to drive the feed regulator to rotate through the rack.

[0009] Furthermore, the adjusting surface of the feed adjuster is an arcuate surface, and the end of the rack is used to abut against the arcuate surface. After the end of the rack abuts against the arcuate surface, the feed adjuster is driven to rotate.

[0010] Furthermore, the end of the rack has an arc structure, and the arc structure is used to abut against the arc surface of the feed regulator to drive the feed regulator to rotate.

[0011] Furthermore, the needle distance adjustment device also includes: a swing plate seat, one end of which is connected to the feed regulator, and the first transmission structure drives the swing plate seat to rotate through the feed regulator to adjust the needle distance.

[0012] Furthermore, the needle distance adjustment device also includes: a feed shaft connected to the swing plate seat, and the swing plate seat adjusts the needle distance by limiting the swing position of the feed shaft.

[0013] Furthermore, the stitch length adjustment device also includes: a second transmission structure, one end of the second transmission structure is connected to the driving end of the driving structure, and the other end of the second transmission structure is connected to the presser foot. When the driving structure drives the presser foot to lift through the second transmission structure, the rack disengages from the feed adjuster; when the driving structure drives the presser foot to fall through the second transmission structure, the rack abuts against the feed adjuster to adjust the rotation angle of the feed adjuster.

[0014] Furthermore, the second transmission structure includes a second gear, and the first gear is engaged with the second gear to drive the presser foot to move.

[0015] Furthermore, the second transmission structure also includes a connecting rod structure, one end of the connecting rod structure is connected to the second gear, and the other end of the connecting rod structure is connected to the presser foot. The second gear drives the presser foot to be lifted or lowered through the connecting rod structure.

[0016] According to another aspect of the present invention, a sewing machine is provided, comprising: a housing and a stitch length adjusting device. The stitch length adjusting device is arranged on the housing, and the stitch length adjusting device is the stitch length adjusting device provided above.

[0017] By applying the technical solution of the present invention, when the needle length adjustment device is in operation, the drive structure is activated, which not only drives the presser foot to be raised or lowered, but also adjusts the position of the feed regulator, thereby adjusting the needle length. Therefore, the technical solution provided by the present invention can solve the technical problem of the inconvenience of adjusting the needle length in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 It shows a structural schematic diagram of a needle distance adjustment device provided according to the first embodiment of the present invention;

[0020] Figure 2 It shows a side view of a needle distance adjustment device provided according to the first embodiment of the present invention; and

[0021] Figure 3 A structural schematic diagram of another angle of the needle distance adjustment device provided according to the first embodiment of the present invention is shown.

[0022] The above drawings include the following reference numerals:

[0023] 10. Drive structure; 20. Presser foot; 30. Feed adjuster; 31. Adjustment surface; 40. First gear; 50. Rack; 51. Arc structure; 80. Second transmission structure; 81. Second gear; 82. Connecting rod structure; 821. First connecting rod; 822. Second connecting rod; 823. Third connecting rod; 8231. Hinge point; 90. Lifting plate; 100. Pressing rod; 110. Pressing rod guide; 120. Pressing rod sleeve; 130. Pressure-adjusting nut; 140. Pressure-adjusting screw; 150. Mounting plate; 160. Eccentric wheel; 170. Feeding connecting rod; 180. First swing plate; 190. Second swing plate; 200. Swing plate seat; 210. Feed crank; 220. Feed shaft; 230. Tooth rack crank; 240. Tooth rack component; 250. Tooth lifting connecting rod; 260. First tooth lifting crank; 270. Tooth lifting shaft; 280. Second tooth lifting crank; 290. Connecting plate; 300. Reverse stitch electromagnet; 310. Reverse feed connecting rod; 320. Second spring; 330. Needle plate; 340. Feed dog; 350. Reverse stitch shaft; 360. Reverse stitch crank; 370. Reverse stitch shaft sleeve; 380. First spring. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] like Figures 1 to 3 As shown, a first embodiment of the present invention provides a stitch length adjustment device, which includes: a drive structure 10, a presser foot 20 and a feed regulator 30. The drive end of the presser foot 20 drive structure 10 is connected to the presser foot 20, so that the presser foot 20 is driven to be lifted or lowered by the drive structure 10. The drive end of the drive structure 10 is connected to the feed regulator 30, so that the position of the feed regulator 30 is adjusted by the drive structure 10 to adjust the stitch length. The stitch length here refers to the distance between the needle and the needle during sewing. The feed regulator 30 in this embodiment is installed on the casing of the sewing machine.

[0026] The needle length adjustment mechanism provided in this embodiment is applied. When the needle length adjustment device is in operation, the drive structure 10 is activated. The drive structure 10 can not only drive the presser foot 20 to be raised or lowered, but also adjust the position of the feed regulator 30. The size of the needle length is adjusted by adjusting the position of the feed regulator 30. Compared with the prior art that can only adjust the needle length manually, the needle length adjustment mechanism provided by the present invention can conveniently adjust the needle length through the drive structure 10. The needle length can also be adjusted during sewing to facilitate denser stitching. The drive structure 10 in this embodiment can be a motor, and the motor is arranged on the housing of the sewing machine.

[0027] To better adjust the position of the feed regulator 30 via the drive structure 10, the stitch length adjustment device in this embodiment further includes a first transmission structure. The first transmission structure is connected to the driving end of the drive structure 10. At least a portion of the first transmission structure is used to abut against the adjustment surface 31 of the feed regulator 30 to drive the feed regulator 30 to rotate. The drive structure 10 drives the first transmission structure to move, thereby adjusting the stitch length by adjusting the rotation angle of the feed regulator 30.

[0028] In this embodiment, the driving end of the drive structure 10 is provided with a first gear 40. Specifically, the first gear 40 is provided on the output shaft of the motor. The first transmission structure is a rack 50. The end of the rack 50 is used to abut against the adjustment surface 31 of the feed regulator 30. The first gear 40 is engaged with the rack 50 to drive the feed regulator 30 to rotate via the end of the rack 50. Using this transmission method, the feed regulator 30 can be driven to rotate conveniently and stably to adjust the stitch length. In this embodiment, the drive structure 10 also includes a mounting plate 150. The mounting plate 150 is provided with a guide hole, and the rack 50 is inserted into the guide hole of the mounting plate 150.

[0029] Specifically, the adjustment surface 31 of the feed adjuster 30 is an arcuate surface, and the end of the rack 50 is designed to abut against the arcuate surface. This contact drives the feed adjuster 30 to rotate. In this embodiment, the arcuate surface is a symmetrical surface, divided into two parts along its axis of symmetry. When the end of the rack 50 abuts one part of the arcuate surface, the sewing machine is in a forward stitching state; when the end of the rack 50 abuts the other part of the arcuate surface, the sewing machine is in a reverse stitching state.

[0030] Specifically, in this embodiment, the end of the rack 50 has an arc structure 51, which is used to abut against the arc surface of the feed regulator 30 to drive the feed regulator 30 to rotate. With this arrangement, the abutment between the arc structure 51 and the arc surface can reduce the impact on the arc surface during the driving process, thereby protecting the regulating surface 31 of the regulator.

[0031] In this embodiment, the needle length adjustment device also includes a swing plate seat 200, one end of the swing plate seat 200 is connected to the feed regulator 30, and the first transmission structure drives the swing plate seat 200 to rotate through the feed regulator 30 to adjust the needle length.

[0032] In this embodiment, the needle distance adjustment device further includes a feed shaft 220 , which is connected to the swing plate seat 200 . The swing plate seat 200 adjusts the needle distance by limiting the swing position of the feed shaft 220 .

[0033] In order to better drive the presser foot 20 to be raised or lowered, the stitch length adjustment device in this embodiment also includes a second transmission structure 80. One end of the second transmission structure 80 is connected to the driving end of the driving structure 10, and the other end of the second transmission structure 80 is connected to the presser foot 20. When the driving structure 10 drives the presser foot 20 to be raised through the second transmission structure 80, the rack 50 is disengaged from the feed regulator 30. When the driving structure 10 drives the presser foot 20 to fall and press the needle plate 330 through the second transmission structure 80, the driving structure 10 also drives the rack 50 to move downward. When the rack 50 moves to abut against the feed regulator 30, the rack 50 drives the feed regulator 30 to rotate to adjust the rotation angle of the feed regulator 30.

[0034] To facilitate movement of the second transmission structure 80 by the first gear 40, the second transmission structure 80 in this embodiment includes a second gear 81. The first gear 40 meshes with the second gear 81 to drive movement of the presser foot 20. With the stitch length adjustment device of this embodiment, when the first gear 40 rotates, the first gear 40 simultaneously drives the second gear 81 and the rack 50 to move, thereby respectively driving movement of the presser foot 20 and the feed regulator 30.

[0035] In order to better drive the presser foot 20 to be raised or lowered, the second transmission structure 80 in this embodiment further includes a connecting rod structure 82. One end of the connecting rod structure 82 is connected to the second gear 81, and the other end of the connecting rod structure 82 is connected to the presser foot 20. The second gear 81 drives the presser foot 20 to be raised or lowered through the connecting rod structure 82.

[0036] The stitch length adjustment device in this embodiment also includes a pressure-adjusting screw 140 and a pressure-adjusting nut 130. The pressure-adjusting screw 140 is installed on the housing of the sewing machine. By adjusting the screw-in depth of the pressure-adjusting screw 140, the compression of the first spring 380 can be adjusted, and the downward pressure of the presser foot 20 can be controlled by the pressure rod 100. The pressure rod sleeve 120 is fixedly installed on the housing. The pressure rod 100 is installed in the pressure rod sleeve 120. The top end of the pressure rod 100 abuts against the lower end of the first spring 380. The pressure rod 100 tool holder is installed on the pressure rod 100, and the needle plate 330 is installed on the bottom plate of the sewing machine.

[0037] In this embodiment, the stitch length adjustment device further includes a mounting plate 150, which is disposed on the housing. The second gear 81 is a sector gear hinged to the mounting plate 150. The connecting rod structure 82 includes a first connecting rod 821, a second connecting rod 822, and a third connecting rod 823. The first end of the first connecting rod 821 is hinged to the sector gear, the second end of the first connecting rod 821 is hinged to the first end of the second connecting rod 822, the second end of the second connecting rod 822 is hinged to the first end of the third connecting rod 823, and the second end of the third connecting rod 823 is used to drive the pressure rod 100 to rise or fall. The third connecting rod 823 is provided with a hinge point 8231, which is disposed on the housing to improve the stability of the overall movement of the connecting rod structure 82. By disposing the second connecting rod 822 between the first connecting rod 821 and the third connecting rod 823, the flexibility of the overall movement of the device can be increased, making it easier for the connecting rod structure 82 to drive the pressure rod 100 to move. The needle distance adjustment device in this embodiment also includes a lifting plate 90 and a pressure rod 100 tool holder. The second end of the third connecting rod 823 abuts against the first end of the lifting plate 90, and the second end of the lifting plate 90 abuts against the pressure rod guide frame 110. Specifically, the second end of the lifting plate 90 abuts against the lower end surface of the pressure rod 100 tool holder to drive the pressure rod 100 to rise or fall.

[0038] The stitch length adjustment device in this embodiment also includes an eccentric wheel 160 and an upper shaft. The upper shaft is not shown in the figure. The eccentric wheel 160 is arranged on the upper shaft and rotates with the rotation of the upper shaft. The first end of the eccentric wheel 160 is hinged to the first end of the tooth lifting connecting rod 250, and the second end of the tooth lifting connecting rod 250 is hinged to the first end of the first tooth lifting crank 260. The second end of the first tooth lifting crank 260 is arranged on the lifting and pressing shaft to drive the tooth lifting shaft 270 to rotate through the first tooth lifting crank 260. The tooth lifting shaft 270 is passed through the bottom plate. The second tooth lifting crank 280 is arranged on the lifting and pressing shaft to drive the second tooth lifting crank 280 to move through the tooth lifting shaft 270. The second tooth lifting crank 280 is a fork-shaped crank.

[0039] In this embodiment, the second end of the eccentric wheel 160 is hinged to the first end of the feed connecting rod 170, the second end of the feed connecting rod 170 is hinged to the first end of the first swing plate 180, and the second end of the feed connecting rod 170 is hinged to the first end of the second swing plate 190. The second end of the second swing plate 190 is hinged to the first end of the feed crank 210, the second end of the first swing plate 180 is hinged to the first end of the swing plate base 200, and the feed crank 210 is fixedly connected to the feed shaft 220, which is passed through the base plate. The first end of the tooth frame crank 230 is fixedly connected to the feed shaft 220, the second end of the tooth frame crank 230 is hinged to the first end of the tooth frame component 240, and the second end of the tooth frame component 240 can slide back and forth within the slide groove of the second tooth lifting crank 280. The feed dog 340 is fixedly connected to the tooth frame component 240. The first end of the feeding regulator 30 is hinged to the reverse feeding link 310 , and the second end of the reverse feeding link 310 is hinged to the first end of the swing plate seat 200 .

[0040] The stitch length adjustment device in this embodiment further includes a reverse stitch shaft sleeve 370, which is fixedly connected to the base plate. The reverse stitch shaft 350 passes through the reverse stitch shaft sleeve 370 and is fixedly connected to the swing plate base 200. The reverse stitch crank 360 is fixedly connected to the first end of the reverse stitch shaft 350. The first end of the reverse stitch crank 360 is hinged to the first end of the connecting plate 290. The second end of the connecting plate 290 is hinged to the iron core of the reverse stitch electromagnet 300, and the reverse stitch electromagnet 300 is fixedly connected to the base plate.

[0041] Specifically, the upper shaft drives the eccentric wheel 160 to rotate. The first end of the eccentric wheel 160 converts the rotational motion into reciprocating swinging motion of the tooth lifting shaft 270 through the tooth lifting connecting rod 250 and the first tooth lifting crank 260. This is then converted into up and down reciprocating motion of the tooth frame through the second tooth lifting crank. The motion amplitude is fixed. The second end of the eccentric wheel 160 converts the reciprocating swinging motion of the feed shaft 220 through the feed connecting rod 170, the swing plate seat 200, the first swing plate 180, the second swing plate 190, the feed crank 210, and other parts. This is then converted into forward and backward motion of the tooth frame through the tooth frame crank 230. By adjusting the angle of the swing plate seat 200, the swing amplitude of the feed shaft 220 can be adjusted to achieve the purpose of controlling the stitch length during sewing.

[0042] In this embodiment, the swing plate base 200, the reverse feed connecting rod 310, the feed regulator 30 and the sewing machine casing constitute a four-bar mechanism. By adjusting the swing angle of the swing plate base 200, the swing angle of the feed regulator 30 can be adjusted to control the stitch length.

[0043] Specifically, when adjusting the stitch length, the motor drives the rack 50 downward to the desired position. The lower end of the rack 50 abuts the feed adjuster 30, and the second spring 320 is a tension spring. The second spring 320 maintains the two in abutment, keeping the swing plate base 200 stationary, and the feed dog 340 outputs a fixed stitch length. When the stitch length needs to be adjusted, the stitch length can be changed by simply adjusting the position of the rack 50. When adjusting the stitch length, the distance from the hinge hole at the upper end of the sector gear to the third connecting rod 823 is less than the maximum center-to-center distance between the hinge hole at the first end of the first connecting rod 821 and the hinge hole at the second end of the second connecting rod 822. At this time, the first connecting rod 821 and the second connecting rod 822 can rotate relative to each other about their hinge, without affecting the third connecting rod 823 and causing the problem of accidentally lifting the presser foot 20.

[0044] When the presser foot 20 needs to be lifted, the motor drives the sector gear to rotate, and drives the first connecting rod 821 to move, so that the hinge of the first connecting rod 821 and the hinge of the second connecting rod 822 are against each other to form an integral body. When the motor continues to rotate, the second connecting rod 822 drives the third connecting rod 823 to rotate around A, and the second end of the third connecting rod 823 moves upward, and drives the lifting plate 90, the pressure bar guide frame 110, the pressure bar 100, and the presser foot 20 parts to move upward, completing the presser foot 20 action. When the presser foot 20 is lifted, the rack 50 moves upward, away from the feed regulator 30. At this moment, the feed regulator 30 is not restricted by the rack 50, because when the presser foot 20 is lifted, sewing operations can not be performed. As long as the rack 50 is timely moved down to the required position after the presser foot 20 actions are completed, it does not affect sewing next time.

[0045] The stitch length adjustment device in this embodiment also includes a reverse stitching electromagnet 300. The function of the reverse stitching electromagnet 300 is to make the curved surface of the feed regulator 30 abut against the rack 50, so that the angle of the swing plate seat 200 is reversed to complete the reverse stitching operation.

[0046] The second embodiment of the present invention provides a sewing machine, which includes: a housing and a stitch length adjustment device. The stitch length adjustment device is arranged on the housing, and the stitch length adjustment device is the stitch length adjustment device provided in the first embodiment.

[0047] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects: the needle distance can be easily adjusted, and the degree of automation is improved.

[0048] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A needle distance adjustment device, characterized in that: include: Drive structure (10); A presser foot (20), wherein the driving end of the driving structure (10) is connected to the presser foot (20) so as to drive the presser foot (20) to be lifted or lowered through the driving structure (10); A feed regulator (30), wherein the driving end of the drive structure (10) is connected to the feed regulator (30), so that the position of the feed regulator (30) can be adjusted through the drive structure (10) to adjust the needle length; A first transmission structure is connected to a driving end of the driving structure (10), at least a portion of the first transmission structure is used to abut against an adjusting surface (31) of the feed regulator (30) to drive the feed regulator (30) to rotate, and the driving structure (10) drives the first transmission structure to move, so as to adjust the stitch length by adjusting the rotation angle of the feed regulator (30); The driving end of the driving structure (10) is provided with a first gear (40), the first transmission structure is a rack (50), the end of the rack (50) is used to abut against the adjustment surface (31) of the feeding regulator (30), and the first gear (40) is engaged with the rack (50) to drive the feeding regulator (30) to rotate through the rack (50); The regulating surface (31) of the feed regulator (30) is an arcuate surface, and the end of the rack (50) is used to abut against the arcuate surface. After the end of the rack (50) abuts against the arcuate surface, the feed regulator (30) is driven to rotate. The arcuate surface is a symmetrical surface, and the arcuate surface is divided into two parts along the symmetry axis of the arcuate surface; when the end of the rack (50) abuts against one part of the arcuate surface, the sewing machine is in a forward sewing state; when the end of the rack (50) abuts against the other part of the arcuate surface, the sewing machine is in a reverse sewing state; The end of the rack (50) has an arc structure (51), and the arc structure (51) is used to abut against the arc surface of the feed regulator (30) to drive the feed regulator (30) to rotate; The stitch length adjustment device further comprises: a second transmission structure (80), one end of the second transmission structure (80) is connected to the driving end of the driving structure (10), and the other end of the second transmission structure (80) is connected to the presser foot (20), when the driving structure (10) drives the presser foot (20) to rise through the second transmission structure (80), the rack (50) is disengaged from the feed regulator (30); when the driving structure (10) drives the presser foot (20) to fall through the second transmission structure (80), the rack (50) moves to abut against the feed regulator (30) to adjust the rotation angle of the feed regulator (30); The second transmission structure (80) comprises a second gear (81), and the first gear (40) is meshed with the second gear (81) to drive the presser foot (20) to move; The second transmission structure (80) further includes a connecting rod structure (82), one end of the connecting rod structure (82) is connected to the second gear (81), and the other end of the connecting rod structure (82) is connected to the presser foot (20), and the second gear (81) drives the presser foot (20) to be raised or lowered through the connecting rod structure (82).

2. The needle distance adjustment device according to claim 1, characterized in that: The stitch length adjustment device further comprises: A swing plate seat (200), one end of which is connected to the feed regulator (30), and the first transmission structure drives the swing plate seat (200) to rotate via the feed regulator (30) to adjust the stitch length.

3. The needle distance adjustment device according to claim 2, characterized in that: The stitch length adjustment device further comprises: The feeding shaft (220) is connected to the swing plate seat (200), and the swing plate seat (200) adjusts the needle pitch by limiting the swing position of the feeding shaft (220).

4. A sewing machine, characterized in that: The sewing machine comprises: chassis; A needle distance adjusting device is provided on the housing, and the needle distance adjusting device is the needle distance adjusting device according to any one of claims 1 to 3.

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