阅读说明：本技术 可调节的送布机构及缝纫机 (Adjustable cloth feeding mechanism and sewing machine ) 是由 郑吉� 祝书伟 赵秋红 于 2019-11-08 设计创作，主要内容包括：本发明提供一种可调节的送布机构及缝纫机,其包括：主轴、与送布组件相连的送布偏心轮和与抬牙组件相连的抬牙偏心轮,送布偏心轮固定在主轴上,抬牙偏心轮转动设于主轴上；离合机构,设于所述送布偏心轮和抬牙偏心轮间,将所述送布偏心轮和抬牙偏心轮相连,以实现所述送布偏心轮和抬牙偏心轮在周向运动的分离和接合；调节组件,驱动离合机构动作,解除送布偏心轮和抬牙偏心轮在周向运动的接合。本发明可以实现送布动作的提前或者延后,调节的角度越大提前或者延后的趋势越明显。(The invention provides an adjustable cloth feeding mechanism and a sewing machine, comprising: the cloth feeding eccentric wheel is fixed on the main shaft, and the tooth lifting eccentric wheel is rotatably arranged on the main shaft; the clutch mechanism is arranged between the cloth feeding eccentric wheel and the tooth lifting eccentric wheel and connects the cloth feeding eccentric wheel and the tooth lifting eccentric wheel so as to realize the separation and the connection of the cloth feeding eccentric wheel and the tooth lifting eccentric wheel in the circumferential motion; and the adjusting assembly drives the clutch mechanism to act, and the engagement of the cloth feeding eccentric wheel and the tooth lifting eccentric wheel in the circumferential motion is released. The invention can realize the advance or delay of the cloth feeding action, and the larger the adjusting angle is, the more obvious the trend of the advance or delay is.)

1. An adjustable feed mechanism, comprising: the cloth feeding eccentric wheel is fixed on the main shaft, and the tooth lifting eccentric wheel is rotatably arranged on the main shaft;

the clutch mechanism is arranged between the cloth feeding eccentric wheel and the tooth lifting eccentric wheel and connects the cloth feeding eccentric wheel and the tooth lifting eccentric wheel so as to realize the separation and the connection of the cloth feeding eccentric wheel and the tooth lifting eccentric wheel in the circumferential motion;

and the adjusting assembly drives the clutch mechanism to act, and the engagement of the cloth feeding eccentric wheel and the tooth lifting eccentric wheel in the circumferential motion is released.

2. The adjustable feed mechanism of claim 1, wherein: the clutch mechanism comprises a holding piece, a ratchet wheel and a pawl, the ratchet wheel is fixedly connected with the cloth feeding eccentric wheel, the pawl is connected with the tooth lifting eccentric wheel in a sliding mode and slides along the radial direction of the tooth lifting eccentric wheel, and the holding piece keeps the pawl meshed with the ratchet wheel; the adjusting component drives the pawl to slide.

3. An adjustable feed mechanism as claimed in claim 2, wherein: the adjusting component comprises an adjusting shaft which is arranged on the shell of the sewing machine in a penetrating mode and moves along the axis vertical to the main shaft, and a return spring which is arranged on the adjusting shaft in a penetrating mode.

4. An adjustable feed mechanism as claimed in claim 3, wherein: one side of the feed lifting eccentric wheel, facing the feed conveying eccentric wheel, is provided with a sliding groove, the pawl is arranged in the sliding groove in a sliding manner, and the feed lifting eccentric wheel is provided with a guide groove facing the adjusting shaft.

5. An adjustable feed mechanism as claimed in claim 2, wherein: the retaining member is a torsion spring.

6. The adjustable feed mechanism of claim 1, wherein: the clutch mechanism comprises a first tooth groove part arranged on the cloth feeding eccentric wheel, a second tooth groove part arranged on the tooth lifting eccentric wheel and a combination sleeve positioned between the cloth feeding eccentric wheel and the tooth lifting eccentric wheel, wherein a circle of tooth grooves are formed in the inner wall of the combination sleeve, the combination sleeve is mutually meshed with the first tooth groove part and the second tooth groove part under the holding of the holding piece, and the combination sleeve can axially slide along the first tooth groove part and the second tooth groove part; the adjusting assembly drives the combination sleeve to axially slide to release the engagement of the combination sleeve and the second tooth groove part.

7. An adjustable feed mechanism as claimed in claim 6, wherein: the adjusting assembly comprises a poke rod which is rotatably arranged and an adjusting rod which is arranged on the shell of the sewing machine in a penetrating mode and drives the poke rod to rotate, and the poke rod drives the combination sleeve to slide towards the cloth feeding eccentric wheel along the axial direction when rotating.

8. The adjustable feed mechanism of claim 7, wherein: and the tooth lifting eccentric wheel is provided with an insertion groove for inserting the end part of the poking rod.

9. The adjustable feed mechanism of claim 7, wherein: the poke rod is connected with a return spring.

10. An adjustable feed mechanism as claimed in claim 6, wherein: the holding piece is a compression spring arranged between the combination sleeve and the cloth feeding eccentric wheel.

11. The adjustable feed mechanism of claim 1, wherein: the main shaft is provided with a rotating wheel, the rotating wheel is provided with scales, and a shell of the sewing machine is provided with a pointer matched with the scales.

12. A sewing machine having an adjustable feed mechanism as claimed in any one of claims 1 to 11.

Technical Field

The invention relates to the technical field of sewing machines, in particular to an adjustable cloth feeding mechanism and a sewing machine.

Background

The existing sewing machine can only realize single type of 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 figure 4, functions 'SX-phi' and 'SY-phi' have a certain phase difference △ phi, and because the position angle of the existing cloth feeding tooth lifting cam 200 relative to the main shaft 100 is not adjustable, the main shaft rotation angles phi corresponding to t1 and t2 are fixed in a function curve of the rotation angles phi of the SX and the SY relative to the main shaft 100, under a standard condition, the phase difference △ phi is about 90 degrees, and the 'SX-phi' and the 'SY-phi' jointly act to form a tooth feeding track, as shown in figure 5, the track is in the form of a standard type track, wherein the point 1 is a point (corresponding to the time t1) when a tooth goes out of a needle plate, the point 2 is a highest point of the tooth, the point 3 is a point (corresponding to the time t2) when the tooth enters the needle plate, the points a and b are horizontal distances of the point 1 and the point 2, the point 2 and the point 3 respectively, and the ratio of a/b in the standard type track is close to '1', the distance is basically the same, and the distance between the two types of the standard type tracks is suitable for sewing materials with relatively low thickness and relatively.

Therefore, a sewing machine cloth feeding mechanism which is suitable for both thick materials and thin materials is needed.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, the present invention provides an adjustable cloth feeding mechanism and a sewing machine, 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 an adjustable cloth feeding mechanism, comprising: the cloth feeding eccentric wheel is fixed on the main shaft, and the tooth lifting eccentric wheel is rotatably arranged on the main shaft;

the clutch mechanism is arranged between the cloth feeding eccentric wheel and the tooth lifting eccentric wheel and connects the cloth feeding eccentric wheel and the tooth lifting eccentric wheel so as to realize the separation and the connection of the cloth feeding eccentric wheel and the tooth lifting eccentric wheel in the circumferential motion;

and the adjusting assembly drives the clutch mechanism to act, and the engagement of the cloth feeding eccentric wheel and the tooth lifting eccentric wheel in the circumferential motion is released.

Preferably, the clutch mechanism comprises a holding piece, a ratchet wheel and a pawl, the ratchet wheel is fixedly connected with the cloth feeding eccentric wheel, the pawl is connected with the tooth lifting eccentric wheel in a sliding mode and slides along the radial direction of the tooth lifting eccentric wheel, and the holding piece holds the pawl to be meshed with the ratchet wheel; the adjusting component drives the pawl to slide.

Preferably, the adjusting assembly comprises an adjusting shaft which is arranged on a machine shell of the sewing machine in a penetrating mode and moves along the axis vertical to the main shaft, and a return spring which is arranged on the adjusting shaft in a penetrating mode.

Preferably, a sliding groove is formed in one side, facing the cloth feeding eccentric wheel, of the tooth lifting eccentric wheel, the pawl is arranged in the sliding groove in a sliding mode, and a guide groove facing the adjusting shaft is formed in the tooth lifting eccentric wheel.

Preferably, the retaining member is a torsion spring.

Preferably, the clutch mechanism comprises a first tooth groove part arranged on the cloth feeding eccentric wheel, a second tooth groove part arranged on the tooth lifting eccentric wheel and a combination sleeve positioned between the cloth feeding eccentric wheel and the tooth lifting eccentric wheel, wherein a circle of tooth grooves are formed in the inner wall of the combination sleeve, the combination sleeve is mutually meshed with the first tooth groove part and the second tooth groove part under the holding of the holding piece, and the combination sleeve can axially slide along the first tooth groove part and the second tooth groove part; the adjusting assembly drives the combination sleeve to axially slide to release the engagement of the combination sleeve and the second tooth groove part.

Preferably, the adjusting assembly comprises a poke rod which is rotatably arranged and an adjusting rod which is arranged on a shell of the sewing machine in a penetrating mode and drives the poke rod to rotate, and the poke rod drives the combination sleeve to slide towards the cloth feeding eccentric wheel along the axial direction when rotating.

Preferably, the tooth lifting eccentric wheel is provided with an insertion groove into which the end part of the poke rod is inserted.

Preferably, the poke rod is connected with a return spring.

Preferably, the holding member is a compression spring provided between the coupling sleeve and the cloth feeding eccentric wheel.

Preferably, the main shaft is provided with a rotating wheel, the rotating wheel is provided with scales, and a casing of the sewing machine is provided with a pointer matched with the scales.

The invention also provides a sewing machine which is provided with the adjustable cloth feeding mechanism.

As described above, the adjustable cloth feeding mechanism and the sewing machine of the present invention have the following beneficial effects: the cloth feeding eccentric wheel and the feed lifting eccentric wheel realize the separation and the connection in the circumferential motion through the clutch mechanism, when the cloth feeding eccentric wheel and the feed lifting eccentric wheel are separated, the main shaft can be rotated, so that the feed lifting eccentric wheel and the main shaft can deflect, the position angle of the feed lifting eccentric wheel and the position angle of the feed lifting eccentric wheel are changed simultaneously, the feed feeding eccentric wheel is fixed relative to the main shaft, the feed feeding eccentric wheel is not changed, the feed lifting eccentric wheel is changed, the advance or the delay of the feed feeding action can be realized, and the greater the adjusting angle is, the more the advance or the delay trend is obvious.

Drawings

FIG. 1 is a schematic view of a cloth feeding mechanism of a sewing machine according to the prior art.

Fig. 2 shows a schematic view of a feed eccentric of the prior art.

Fig. 3 shows a schematic view of a cloth feed actuator.

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 is a schematic view of a cloth feeding mechanism of a sewing machine according to a first embodiment of the present invention.

FIG. 7 is an exploded view of a first embodiment of a cloth feeding mechanism of a sewing machine.

Fig. 8 is a schematic view of a clutch mechanism according to the first embodiment.

FIG. 9 is a diagram showing the relationship between the X-direction and Y-direction movement displacement of the feed dog and the main shaft of the sewing machine according to the present invention.

Fig. 10 is a schematic view of the cloth feeding track of the present invention.

Fig. 11 is another schematic view of the cloth feeding track of the present invention.

FIG. 12 is a diagram showing the take-up timing of the take-up lever and the cloth feeding timing.

FIG. 13 is a schematic view of a second embodiment of a cloth feeding mechanism of a sewing machine according to the present invention.

Fig. 14 is a state diagram of the second embodiment in which the feed cam and the feed lifting cam are locked.

Fig. 15 is a schematic view of a clutch mechanism according to a second embodiment.

Description of the element reference numerals

1 spindle

2 rotating wheel

21 scale

22 indicating mark

3 adjusting shaft

31 return spring

4 cloth feeding connecting rod

5. 17 cloth feeding eccentric wheel

51. 171 eccentric part for cloth feeding

172 first gullet portion

52 ratchet

6 screw

7 stop pin

8 pawl

81 engaging part

9 holding member

10 spacing pin

11. 16 eccentric cam of lifting tooth

111. 162 eccentric part of tooth lifting

112 chute

113 guide groove

161 second tooth space portion

163 insertion groove

12 lifting tooth connecting rod

13 adjusting rod

14 poke rod

141 poke rod end

15 return spring

18 screw

19 compression spring

21 combining sleeve

211 tooth slot

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 15. 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.

For convenience of description, a direction perpendicular to the axis of the main shaft is referred to as an up-down direction in this specification.

As shown in fig. 1 to 15, the present invention mainly relates to a sewing machine, the core of which mainly provides an adjustable cloth feeding mechanism, comprising: the cloth feeding device comprises a main shaft 1, cloth feeding eccentric wheels 5 and 17 connected with a cloth feeding assembly and feed lifting eccentric wheels 11 and 16 connected with a feed lifting assembly, wherein the cloth feeding eccentric wheels 5 and 17 are fixed on the main shaft 1, and the feed lifting eccentric wheels 11 and 16 are rotatably arranged on the main shaft 1;

the clutch mechanism is arranged between the cloth feeding eccentric wheels 5 and 17 and the tooth lifting eccentric wheels 11 and 16 and connects the cloth feeding eccentric wheels 5 and 17 and the tooth lifting eccentric wheels 11 and 16 to realize the separation and connection of the circumferential motion of the cloth feeding eccentric wheels 5 and 17 and the tooth lifting eccentric wheels 11 and 16;

the adjusting component drives the clutch mechanism to act, and the engagement of the cloth feeding eccentric wheels 5 and 17 and the tooth lifting eccentric wheels 11 and 16 in the circumferential motion is released.

The cloth feeding eccentric wheels 5 and 17 and the tooth lifting eccentric wheels 11 and 16 realize the separation and the connection of circumferential motion through a clutch mechanism, when the cloth feeding eccentric wheels are separated, the main shaft 1 can be rotated, so that the tooth lifting eccentric wheels 11 and 16 and the main shaft 1 can deflect, and the cloth feeding eccentric wheels 5 and 17 are fixed relative to the main shaft 1, so the cloth feeding eccentric wheel is not changed relative to the main shaft 1, while the tooth lifting eccentric wheel is changed relative to the main shaft 1, and the advancing or the delaying of the cloth feeding action can be realized, and the larger the adjusting angle is, the more the tendency of advancing or delaying the cloth feeding action is obvious.

For convenience of adjustment, in the embodiment, a rotating wheel 2 is arranged at the end of the main shaft 1, a scale 21 is arranged on the rotating wheel 2, and an indication mark 22 matched with the scale 21 is arranged on the shell of the sewing machine.

The working principle of the invention is as follows:

the adjustment of the feed motion can be achieved by rotating the rotating wheel 2 by actuating the clutch mechanism through the adjustment assembly to unlock the engagement of the feed cams 5, 17 and the feed cams 11, 16 in a circumferential movement.

As shown in FIG. 9, under normal conditions, the clutch mechanism is in the "locked" state, the X-direction displacement function "SY-phi" curve (see curve s1 in FIG. 9) and the Y-direction displacement function "SX-phi" curve of the teeth are substantially the same as those in FIG. 4, and the trajectory of the feed dog formed by the X-direction displacement function "SY-phi" curve is a standard trajectory, when the rotating wheel 2 rotates, the scale 21 indicates positive, the Y-direction displacement function "SX-phi" of the teeth translates rightward (see curve s2 in FIG. 9), while the X-direction displacement function "SY-phi" curve remains unchanged, so that while the feed motion is delayed, the phase difference △ phi between the X-direction displacement function "SY-phi" curve and the Y-direction displacement function "SX-phi" curve increases, thereby causing the shape of the teeth to shift from the standard trajectory to the far triangular trajectory, as shown in FIG. 10, when the scale 21 indicates negative, the Y-direction displacement function "SX-phi" curve translates leftward (see curve s3 in FIG. 9), while the X-direction displacement function "Y-phi" curve remains unchanged, thereby causing the teeth to shift toward the Y-phi "curve to the near to the triangular trajectory, thereby causing the teeth to shift toward the tooth to become smaller.

See fig. 10, in a far triangular trajectory, where: point 1 is the point (corresponds moment t1) when the tooth goes out the faller, point 2 is the tooth peak, point 3 is the point (corresponds moment t2) when the tooth goes into the faller, a, b are the horizontal direction distance of point 1 and point 2, point 2 and point 3 respectively, its a/b's ratio is greater than "1", a is great than b promptly, it is big along with its ratio of increase of scale numerical value, its vertical height of this kind of form orbit is slowly increased in tooth work feed prophase, it is slowly increased to correspond work feed power, its vertical height reduces fast in tooth work feed later stage, it reduces fast to correspond work feed power, be favorable to the take-up lever to receive the line, be fit for sewing thicker cloth.

See fig. 11, in a near triangular trajectory, where: point 1 is the point (corresponds moment t1) when the tooth goes out the faller, point 2 is the tooth peak, point 3 is the point (corresponds moment t2) when the tooth gets into the faller, a, b are the horizontal direction distance of point 1 and point 2, point 2 and point 3 respectively, its a/b's ratio is less than "1", a is less than b promptly, its ratio is littleer along with the increase of scale numerical value, its vertical height of this kind of form orbit in tooth work feed earlier stage increases fast, correspond work feed power and increase fast, its vertical height slowly reduces in tooth work feed later stage, correspond work feed power and slowly reduce, be difficult to produce the wrinkle, be fit for sewing thinner cloth.

As shown in fig. 12, after 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 more easily tightened and is suitable for the thick fabric; when the cloth feeding action is advanced, partial suture is clamped by the sewing material and the needle plate when the take-up lever starts to take up the thread, so that the take-up resistance of the take-up lever is increased, the suture is not easy to tighten, and the cloth feeding device is suitable for the sewing material which is thin in thickness and easy to wrinkle.