CN111020892B - Sewing machine with adjustable tooth track - Google Patents
Sewing machine with adjustable tooth track Download PDFInfo
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- CN111020892B CN111020892B CN201911308611.1A CN201911308611A CN111020892B CN 111020892 B CN111020892 B CN 111020892B CN 201911308611 A CN201911308611 A CN 201911308611A CN 111020892 B CN111020892 B CN 111020892B
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- eccentric wheel
- tooth
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- sewing machine
- lifting
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B27/00—Work-feeding means
- D05B27/24—Feed-dog lifting and lowering devices
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
- D05B69/02—Mechanical drives
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
- D05B69/30—Details
Abstract
The invention provides a sewing machine with adjustable tooth track, which comprises: the tooth lifting assembly comprises a tooth lifting eccentric wheel fixed on the main shaft and a tooth lifting connecting rod connected with the tooth lifting eccentric wheel, and a first matching part containing a plurality of tooth sockets is arranged on the tooth lifting eccentric wheel in the circumferential direction; the feeding component comprises a feeding eccentric wheel sleeved on the main shaft and a feeding connecting rod matched with the feeding eccentric wheel; the feeding eccentric wheel is provided with a stop component which keeps unidirectional locking with the first matching part when rotating; the track adjusting assembly comprises a first driving piece connected with the main shaft and used for driving the main shaft to rotate in the forward and reverse directions and a locking assembly used for being combined with the feeding eccentric wheel and preventing the feeding eccentric wheel from rotating. The invention can adjust the tooth track and adapt to sewing materials with different thicknesses.
Description
Technical Field
The invention relates to a sewing machine, in particular to a sewing machine with an adjustable tooth track.
Background
The existing sewing machine can only realize single type cloth feeding track, has poor adaptability to different types of sewing cloth, and is difficult to adapt to the current diversified and personalized production environment.
The cloth feeding mechanism used in the existing sewing machine is shown in figure 1, and comprises a cloth feeding feed lifting tooth cam 200 fixedly arranged on a main shaft 100 of the sewing machine, a cloth feeding connecting rod 300 and a lifting tooth connecting rod 400, wherein the cloth feeding connecting rod 300 is in transmission connection with a cloth feeding tooth 700 to realize the movement of the cloth feeding tooth 700 along the X direction, and the lifting tooth connecting rod 400 is in transmission connection with the cloth feeding tooth 700 to realize the movement of the cloth feeding tooth along the Y direction.
Specifically, the method comprises the following steps: the feed dog lifting cam 200 is an integrated structure, as shown in fig. 2, the feed dog lifting cam 200 includes a feed eccentric portion 201 and a feed dog eccentric portion 202, which have a specific eccentric angle therebetween and are not adjustable, and at the same time, since the feed dog lifting cam 200 is fixed to the main shaft 100, the position angle thereof with respect to the main shaft is not adjustable. The cloth feeding eccentric portion 201 is provided with a cloth feeding link rod 300, and the tooth lifting eccentric portion 202 is provided with a tooth lifting link rod 400. The eccentric part 202 of the feed lifting tooth transmits power to the feed lifting tooth crank 500 through a connecting rod transmission structure, the eccentric part 201 of the feed feeding tooth transmits power to the tooth frame base 600 through a connecting rod transmission structure, as shown in fig. 3, the swing of the tooth frame base 600 mainly affects the displacement SX of the feed lifting tooth 700 in the X direction, the swing of the feed lifting tooth crank 500 mainly affects the displacement SY of the feed lifting tooth 700 in the Y direction, and the functional curves of SX and SY with respect to the rotation angle Φ of the sewing machine main shaft 100 are respectively shown in fig. 4.
As shown in fig. 4, the functions "SX- Φ" and "SY- Φ" have a certain phase difference Δ Φ, and since the position angle of the conventional cloth feed teething cam 200 with respect to the main shaft 100 is not adjustable, the main shaft rotation angles Φ corresponding to t1 and t2 are fixed in the function curves of the rotation angles Φ of SX and SY with respect to the main shaft 100. In the standard situation, the phase difference Δ Φ is about 90 °, and the "SX- Φ" and "SY- Φ" cooperate to form a feed track, as shown in FIG. 5. As shown in fig. 5, the trajectory is in the form of a standard type trajectory, in which: point 1 is the point when the tooth goes out of the needle plate (corresponding to time t1), point 2 is the highest point of the tooth, point 3 is the point when the tooth goes into the needle plate (corresponding to time t2), a and b are the horizontal distances of point 1 and point 2, point 2 and point 3 respectively, the ratio of a/b in the standard type track is close to '1', and the distances are basically the same. The standard type track is suitable for sewing cloth with medium thickness, and the adaptability to thick materials and thin materials is relatively poor.
Therefore, there is a need for a sewing machine that is compatible with both thick and thin materials.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention provides a sewing machine with adjustable tooth trace, which is used for solving the problem that the sewing machine in the prior art is difficult to adapt to thick materials and thin materials.
To achieve the above and other related objects, the present invention provides a sewing machine with an adjustable tooth trace, comprising:
the lifting tooth assembly comprises a lifting tooth eccentric wheel fixed on the main shaft and a lifting tooth connecting rod connected with the lifting tooth eccentric wheel, and a first matching part comprising a plurality of tooth sockets is arranged on the lifting tooth eccentric wheel in the circumferential direction;
the feeding assembly comprises a feeding eccentric wheel sleeved on the main shaft and a feeding connecting rod matched with the feeding eccentric wheel; the feeding eccentric wheel is provided with a stop component which keeps unidirectional locking with the first matching part when rotating;
the feeding connecting rod and the feed lifting connecting rod are both connected with the feed dog assembly; and
the track adjusting assembly comprises a first driving piece connected with the main shaft and used for driving the main shaft to rotate in the forward and reverse directions, and a locking assembly used for being combined with the feeding eccentric wheel and preventing the feeding eccentric wheel from rotating.
Preferably, one groove wall of the tooth groove is an inclined plane, a groove wall opposite to the inclined plane is a vertical plane, the stop assembly comprises a stop shaft positioned in the feeding eccentric wheel and a compression spring for keeping the stop shaft extending into the tooth groove, when the first driving piece drives the main shaft to rotate in the forward direction, the vertical plane of the tooth groove gives a horizontal forward driving force to the stop shaft, and the feeding eccentric wheel and the tooth lifting eccentric wheel are locked and combined under the elastic force of the compression spring; when the first driving piece drives the main shaft to rotate reversely, the inclined surface of the tooth groove gives an inclined reverse driving force to the stopping shaft, so that the stopping shaft compresses the compression spring to separate from the tooth groove, and the feeding eccentric wheel and the tooth lifting eccentric wheel are separated.
Preferably, a plurality of mounting grooves are formed in the feeding eccentric wheel, and one stop component is arranged in each mounting groove.
Preferably, the first matching part is a ratchet wheel, and the stop component comprises a ratchet arranged on the feeding eccentric wheel and a retaining spring for keeping the ratchet matched with the ratchet wheel.
Preferably, the feeding eccentric wheel is provided with a positioning pin, and the ratchet is rotatably arranged on the positioning pin.
Preferably, the feeding eccentric wheel is provided with a positioning hole, and the retaining spring is arranged at the positioning hole and tightly supports the ratchet wheel on the ratchet wheel.
Preferably, the sewing machine is provided with a track input unit, and the track input unit is connected with the controller.
Preferably, the trajectory input unit is provided with three trajectory selection keys, which are a "standard type" selection key, a "near triangle type" selection key and a "far triangle type" selection key.
Preferably, the end part of the locking rod is provided with a latch, and a gear ring matched with the latch is arranged on the circumferential direction of the feeding eccentric wheel.
As described above, the sewing machine with adjustable tooth tracks of the present invention has the following beneficial effects: the feed eccentric wheel and the feed eccentric wheel are arranged independently, the stop component and the first matching part can be locked in one direction to rotate together, and the motion separation of the two parts can also be realized.
Drawings
Fig. 1 is a schematic view of a cloth feeding mechanism of a sewing machine in the prior art.
Fig. 2 is a schematic view of a cloth feeding feed lifting cam in the prior art.
Fig. 3 is a schematic view of a cloth feeding actuator in the prior art.
FIG. 4 is a diagram showing the relationship between the X-direction and Y-direction movement displacement of a feed dog and the main shaft of a sewing machine in the prior art.
Fig. 5 shows a diagram of a prior art feed dog trajectory.
Fig. 6 shows a sewing machine with adjustable tooth trace according to the present invention.
FIG. 7 is a view showing a first embodiment of the sewing machine with an adjustable tooth trace according to the present invention.
Fig. 8 is a schematic view of a feed lifting eccentric and a feed feeding eccentric according to a first embodiment of the present invention.
FIG. 9 is a schematic diagram of a trace input unit according to the present invention.
Fig. 10 is a schematic view showing the matching of the feed lifting eccentric wheel and the feed feeding eccentric wheel when the main shaft rotates forwards and backwards.
Fig. 11a-11c are schematic views showing the state of adjustment of the tooth trajectory according to the present invention.
FIG. 12 is a view showing a second embodiment of the sewing machine with an adjustable tooth trace according to the present invention.
Fig. 13 is a schematic view of a feed lifting eccentric and a feed feeding eccentric according to the first embodiment of the present invention.
Description of the element reference numerals
1 feeding connecting rod
2 feeding eccentric wheel
3 lifting tooth connecting rod
4 eccentric cam of lifting tooth
5 Main shaft
6 iron core spring
7 second driving member
8 locking lever
9 holding spring
10 ratchet
11 ratchet wheel
12 first driving member
13 track input unit
14 positioning pin
21 eccentric part for feeding
22 ring gear
23 stop shaft
24 hold-down spring
25 screw
41 tooth slot
411 vertical plane
412 inclined plane
42 eccentric part of lifting tooth
43 maximum diameter section
81 latch
100 spindle
200 cloth feeding feed lifting cam
300 cloth feeding connecting rod
400 lifting tooth connecting rod
500 lifting rock shaft crank
600 dental articulator base
700 feed dog
201 eccentric part for feeding cloth
202 eccentric part of lifting tooth
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
Please refer to fig. 1 to 13. It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, and are not used for limiting the conditions that the present disclosure can be implemented, so that the present disclosure is not limited to the technical essence, and any structural modifications, ratio changes, or size adjustments should still fall within the scope of the present disclosure without affecting the efficacy and the achievable purpose of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
As shown in fig. 6 to 13, the present invention provides a sewing machine with an adjustable tooth trace, which includes:
the tooth lifting assembly comprises a tooth lifting eccentric wheel 4 fixed on the main shaft 5 and a tooth lifting connecting rod 3 connected with a tooth lifting eccentric part 42 of the tooth lifting eccentric wheel 4, and a first matching part comprising a plurality of tooth sockets is arranged on the tooth lifting eccentric wheel 4 in the circumferential direction;
the feeding assembly comprises a feeding eccentric wheel 2 sleeved on the main shaft 5 and a feeding connecting rod 1 matched with a feeding eccentric part 21 of the feeding eccentric wheel 2; the feeding eccentric wheel 2 is provided with a stop component which keeps unidirectional locking with the first matching part when rotating;
the feeding connecting rod 3 and the feed lifting connecting rod 1 are both connected with the feed dog assembly; and
the track adjusting assembly comprises a first driving piece 12 and a locking assembly A, wherein the first driving piece 12 is connected with a main shaft 5 and drives the main shaft 5 to rotate in the forward direction and the reverse direction, the locking assembly A is used for being combined with the feeding eccentric wheel 2 to prevent the feeding eccentric wheel from rotating, the locking assembly A comprises a second driving piece 7 and a locking rod 8 connected with the second driving piece 7, a locking portion 22 matched and locked with the locking rod 8 is arranged on the feeding eccentric wheel 2, and the first driving piece 12 and the second driving piece 7 are both connected with a controller of the sewing machine.
The cloth feeding eccentric wheel 2 and the feed lifting eccentric wheel 4 are independently arranged, the stop component and the first matching part can realize unidirectional locking and rotate together with the main shaft 5, and the stop component and the first matching part can also realize action separation of the stop component and the first matching part, namely, the feed lifting eccentric wheel 4 independently rotates with the main shaft 5, when the track adjustment is needed, only the second driving part 7 needs to be driven to act to lock the feed feeding eccentric wheel 2, and then the first driving part 12 drives the main shaft 5 to reversely rotate, so that the feed lifting eccentric wheel 4 independently rotates relative to the feed feeding eccentric wheel 2, the position angle of the feed lifting eccentric wheel and the position angle of the feed lifting eccentric wheel simultaneously change, the feed lifting eccentric wheel does not change, and the feed feeding eccentric wheel changes, thereby realizing the adjustment of the tooth track. The invention can unlock the joint of the cloth feeding eccentric wheel 2 and the feed lifting eccentric wheel 4 in the circumferential motion only by changing the rotation direction of the main shaft, and the adjustment of the cloth feeding action can be realized by rotating the rotating wheel 2; the automatic adjustment of the tooth track can be realized, so that the sewing machine can adapt to sewing materials with different thicknesses.
Example one
In order to realize the unidirectional locking of the feed eccentric 2 and the feed eccentric 4, in this embodiment, one of the slot walls of the tooth space 41 is an inclined surface 412, and the slot wall opposite to the inclined surface 412 is a vertical surface 411, the stop assembly comprises a stop shaft 23 located in the feed eccentric 2 and a compression spring 24 for keeping the stop shaft 23 extending into the tooth space 41, as shown in fig. 10, when the first driving member 12 drives the main shaft 5 to rotate in the forward direction (i.e. the direction indicated by the working turning arrow of the main shaft in the figure), the vertical surface 411 of the tooth space 41 gives a horizontal forward driving force F to the stop shaft 23Is justThe feeding eccentric wheel 2 and the feed lifting eccentric wheel 4 are locked and combined under the elastic force of the pressing spring 24, and normal sewing can be realized at the moment; when the first driving member 12 drives the main shaft 5 to rotate reversely (i.e. the direction indicated by the adjustment steering arrow in the figure), the inclined surface 412 of the tooth groove 41 gives an inclined reverse driving force F to the stopper shaft 23Trans formThe stopper shaft 23 compresses the pressing spring 24 to be disengaged from the teeth groove 41, i.e., a reverse driving force FInverse directionAgainst the spring force F of the pressure spring 24BulletAnd compressing the compression spring, so that the feeding eccentric wheel 2 is separated from the feed lifting eccentric wheel 4, and the adjustment of the tooth track is completed.
In the embodiment, the one-way locking is realized through the matching of the tooth grooves 41 and the stop shaft 23, so that the feeding eccentric wheel 2 and the feed lifting eccentric wheel 4 are combined to complete power transmission when the main shaft rotates forwards, and normal sewing is realized; when the main shaft rotates reversely, the feeding eccentric wheel 2 is separated from the feed lifting eccentric wheel 4, so that the eccentric angle between the feeding eccentric wheel 2 and the feed lifting eccentric wheel 4 is adjusted, and the tooth track is changed.
For better realizing one-way locking, in this embodiment, the feeding eccentric wheel 2 is provided with a plurality of mounting grooves, and one stopping component is arranged in each mounting groove, so that in this embodiment, a hole-shaped mounting groove is directly formed in the feeding eccentric wheel 2, the compression spring 24 and the stopping shaft 23 are directly connected, and the other end of the hole is sealed by the screw 25 to limit the compression spring 24.
The eccentric cam 4 of the lifting tooth in the embodiment is of a step-shaped structure, the eccentric part 42 of the lifting tooth is arranged in the middle, and the section 43 with the largest diameter is fixed with the main shaft 5 and also plays a role of limiting the axial movement of the connecting rod of the lifting tooth.
For convenience of adjustment and control, as shown in fig. 9, in the present embodiment, a trace input unit 13 is provided on the sewing machine, and the trace input unit 13 is connected to the controller. The trajectory input unit 13 is provided with three trajectory selection keys, namely a 'standard type' selection key, a 'near triangle type' selection key and a 'far triangle type' selection key, so that three different trajectories of 'standard type', near triangle type 'and far triangle type' can be switched, and the three trajectories respectively correspond to three types of cloth with medium thickness, thin and thick.
In order to better lock the feeding eccentric wheel 2 and ensure that the feeding eccentric wheel 2 does not rotate during the adjustment of the tooth track in the embodiment, as shown in fig. 7 and 8, the locking assembly a includes a second driving member 7 and a locking rod 8 connected to the second driving member 7, a latch 81 is provided at an end of the locking rod 8, a gear ring 22 engaged with the latch 81 is provided on the feeding eccentric wheel 2 in the circumferential direction, and the latch 81 and the gear ring 22 are engaged and locked in this embodiment. In this embodiment, the second driving member 7 is an electromagnet, the locking rod 8 can be an iron core in the electromagnet, an iron core spring 6 is arranged between the electromagnet body and the iron core, and the locking rod 8 can be stretched by controlling the on/off state of the driving magnet, i.e., the locking and the separation with the feeding eccentric wheel are realized.
The tooth trajectory adjustment process of this embodiment is:
1. under the action of the pressure spring 24, the head of the stop shaft 23 is abutted against the tooth groove 41 of the cam 4, when sewing, the spindle rotates clockwise to drive the cam 4 to rotate, and the cam 4 acts on the stop shaft 23 to drive the forward driving force FIs just forPerpendicular to the vertical plane 411, as shown in fig. 10, to the right in the horizontal direction, the stop shaft 23 drives the feeding eccentric 2 to rotate clockwise;
2. switching trackDuring the shape: a corresponding trajectory selection key is pressed in the trajectory input unit 13 to select a corresponding trajectory shape. The second driving piece 7 can be electrified by an electromagnet, and the locking rod 8 moves downwards until the latch 81 is matched with the gear ring 22 on the feeding eccentric wheel 2 for limiting. The first driving member 12 (the motor assembly in this embodiment) rotates counterclockwise by a corresponding angle in a direction opposite to the working direction according to a predetermined rotation angle value. As shown in fig. 10, the reverse driving force F of the cam 4 acting on the stop shaft 23 during rotationInverse directionIn the direction perpendicular to the active surface, pointing to the left. FInverse directionThe force component in the vertical direction causes the stop shaft 23 to move upward against the pressure of the hold-down spring 24, disengaging from the tooth space 41 of the feed eccentric 4, and separating the feed eccentric 2 and the feed eccentric 4.
Before and after adjustment, the Y-direction displacement function "SY-phi" of the tooth is kept unchanged, as shown in FIG. 11b, and the tooth track is a standard track; when the tooth is rotated by 360 degrees plus X degrees in a counterclockwise direction, as shown in figure 11a, the phase difference delta phi of the X-direction displacement function "SX-phi" of the tooth relative to the function "SY-phi" is increased, so that the shape of the tooth track is changed from the standard type track to the far triangular type track; when rotated 360-X counterclockwise, as shown in FIG. 11c, the X-direction displacement function of the tooth "SX- Φ" is reduced relative to the phase difference Δ Φ of the function "SY- Φ" thereby transforming the tooth trajectory shape from a standard trajectory to a near triangular trajectory.
In the far triangular trajectory, see FIG. 11a, where: point 1 is the point when tooth goes out the faller, point 2 is the tooth peak, point 3 is the point when tooth income faller, a, b is point 1 and point 2 respectively, the horizontal direction distance of point 2 and point 3, its a/b's ratio is greater than "1", a is big than b promptly, along with turned angle is its ratio of increase of X value big more, its vertical height of this kind of form orbit in tooth work feed earlier stage slowly increases, it slowly increases to correspond work feed power, its vertical height in tooth work feed later stage reduces fast, it reduces fast to correspond work feed power, be favorable to the take-up of take-up lever, be fit for making thicker cloth.
In the near triangular trajectory, see FIG. 11c, where: point 1 is the point when tooth goes out the faller, point 2 is the tooth peak, point 3 is the point when tooth income faller, a, b is point 1 and point 2 respectively, the horizontal direction distance of point 2 and point 3, its a/b's ratio is less than "1", a is less than b promptly, along with turned angle is its ratio of increase of X value is less, its vertical height of this kind of form orbit in tooth work feed earlier stage increases fast, it increases fast to correspond work feed power, its vertical height slowly reduces in tooth work feed later stage, it slowly reduces to correspond work feed power, be difficult to produce and corrugate, be fit for making thinner cloth.
When the cloth feeding action is delayed, the thread is not clamped by the sewing material and the needle plate when the take-up lever starts to take up the thread, and the take-up resistance of the take-up lever is small, so that the thread is easy to tighten, and the cloth feeding device is suitable for the thick fabric; when the cloth feeding action is advanced, partial stitches are clamped by the sewing material and the needle plate when the take-up lever starts to take up the stitches, so that the take-up resistance of the take-up lever is increased, the stitches are not easy to tighten, and the cloth feeding device is suitable for sewing materials which are thin in thickness and easy to wrinkle.
Example two
The sewing machine of the embodiment is basically the same as the first embodiment, except that: the mechanism realizes the one-way locking of the feeding eccentric wheel 2 and the feed lifting eccentric wheel 4. As shown in fig. 12 and 13, the first engaging portion is a ratchet 11, and the stopping assembly includes a ratchet 10 provided on the feeding eccentric 2 and a retaining spring 9 for retaining the ratchet 10 engaged with the ratchet 11. In the embodiment, the ratchet mechanism of the ratchet wheel capable of realizing one-way locking is used for realizing that the feeding eccentric wheel and the feed lifting eccentric wheel can be locked and can synchronously rotate when the main shaft rotates forwards, and the feeding eccentric wheel and the feed lifting eccentric wheel are separated when the main shaft rotates backwards to realize tooth track adjustment.
For convenience of implementation, in the embodiment, the feeding eccentric wheel 2 is provided with a positioning pin 14, the ratchet 10 is rotatably arranged on the positioning pin 14, the feeding eccentric wheel 2 is provided with a positioning hole, and the retaining spring 9 is arranged at the positioning hole and tightly presses the ratchet 10 against the ratchet 11. In the embodiment, the stop component is arranged on the inner ring of the feeding eccentric wheel 2, so that the stop component can be matched with the ratchet wheel 11 on the feed lifting eccentric wheel 4; the whole structure is simple and easy to install.
In summary, in the sewing machine with the adjustable tooth track, the cloth feeding eccentric wheel and the feed lifting eccentric wheel are arranged independently, the stop component and the first matching part can realize unidirectional locking and rotation together, and the action separation of the two parts can also be realized. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (9)
1. A sewing machine with adjustable tooth track, comprising:
the lifting tooth assembly comprises a lifting tooth eccentric wheel fixed on the main shaft and a lifting tooth connecting rod connected with the lifting tooth eccentric wheel, and a first matching part comprising a plurality of tooth sockets is arranged on the lifting tooth eccentric wheel in the circumferential direction;
the feeding assembly comprises a feeding eccentric wheel sleeved on the main shaft and a feeding connecting rod matched with the feeding eccentric wheel; the feeding eccentric wheel is provided with a stop component which keeps unidirectional locking with the first matching part when rotating;
the feeding connecting rod and the feed lifting connecting rod are both connected with the feed dog assembly; and
the track adjusting assembly comprises a first driving piece connected with the main shaft and used for driving the main shaft to rotate in the forward and reverse directions and a locking assembly used for being combined with the feeding eccentric wheel and preventing the feeding eccentric wheel from rotating, the locking assembly comprises a second driving piece and a locking rod connected with the second driving piece, the feeding eccentric wheel is provided with a locking part matched and locked with the locking rod, and the first driving piece and the second driving piece are both connected with a controller of the sewing machine;
when the track adjustment is needed, the second driving piece acts to lock the feeding eccentric wheel, then the first driving piece is utilized to drive the main shaft to rotate reversely, and the tooth lifting eccentric wheel rotates independently relative to the feeding eccentric wheel, so that the adjustment of the tooth track can be realized.
2. The sewing machine with adjustable tooth trace according to claim 1, wherein: one groove wall of the tooth groove is an inclined surface, the groove wall opposite to the inclined surface is a vertical surface, and the stop component comprises a stop shaft positioned in the feeding eccentric wheel and a compression spring for keeping the stop shaft extending into the tooth groove.
3. The sewing machine with adjustable tooth trace according to claim 2, wherein: the feeding eccentric wheel is provided with a plurality of mounting grooves, and one stop component is arranged in each mounting groove.
4. The sewing machine with adjustable tooth trace according to claim 1, wherein: the first matching part is a ratchet wheel, and the stop component comprises a ratchet arranged on the feeding eccentric wheel and a retaining spring for retaining the matching of the ratchet and the ratchet wheel.
5. The sewing machine with adjustable tooth trace according to claim 4, wherein: the feeding eccentric wheel is provided with a positioning pin, and the ratchet is rotatably arranged on the positioning pin.
6. The sewing machine with adjustable tooth trace according to claim 4, wherein: the feeding eccentric wheel is provided with a positioning hole, and the retaining spring is arranged at the positioning hole and tightly supports the ratchet wheel on the ratchet wheel.
7. The sewing machine with adjustable tooth trace according to claim 1, wherein: the sewing machine is provided with a track input unit, and the track input unit is connected with the controller.
8. The sewing machine with adjustable tooth trace according to claim 7, wherein: the track input unit is provided with three track selection keys, namely a standard type selection key, a near triangle type selection key and a far triangle type selection key.
9. The sewing machine with adjustable tooth trace according to claim 1, wherein: the end part of the locking rod is provided with a latch, and a gear ring matched with the latch is arranged in the circumferential direction of the feeding eccentric wheel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911308611.1A CN111020892B (en) | 2019-12-18 | 2019-12-18 | Sewing machine with adjustable tooth track |
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| CN201911308611.1A CN111020892B (en) | 2019-12-18 | 2019-12-18 | Sewing machine with adjustable tooth track |
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| CN111020892B true CN111020892B (en) | 2022-06-21 |
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