CN112626725B - Feeding tooth lifting tooth height adjustable mechanism and sewing machine - Google Patents
Feeding tooth lifting tooth height adjustable mechanism and sewing machine Download PDFInfo
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- CN112626725B CN112626725B CN201910905820.8A CN201910905820A CN112626725B CN 112626725 B CN112626725 B CN 112626725B CN 201910905820 A CN201910905820 A CN 201910905820A CN 112626725 B CN112626725 B CN 112626725B
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- tooth
- lifting
- eccentric
- adjusting
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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
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B27/00—Work-feeding means
- D05B27/02—Work-feeding means with feed dogs having horizontal and vertical movements
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- 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
- D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
- D05D2209/00—Use of special materials
- D05D2209/08—Use of special materials elastic, e.g. rubber spring
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
The invention provides a feeding tooth lifting height adjustable mechanism which comprises a main shaft, a lifting tooth shaft, a tooth rack, a feeding tooth, a first lifting tooth transmission assembly connected between the main shaft and the lifting tooth shaft, and a second lifting tooth transmission assembly connected between the lifting tooth shaft and the tooth rack, wherein the first lifting tooth transmission assembly comprises a lifting tooth eccentric wheel sleeved on the main shaft, a lifting tooth eccentric adjusting assembly connected with the main shaft and the lifting tooth eccentric wheel, a lifting tooth connecting rod and a lifting tooth crank fixed on the lifting tooth shaft; when the feed dog height is adjusted, the main shaft is rotated, and the feed dog eccentric adjusting assembly is used for changing the feed dog eccentric amount L between the matching center O1 of the feed dog eccentric wheel and the feed dog connecting rod and the rotation center O2 of the main shaft, so that the transmission efficiency between the main shaft and the feed dog shaft is changed, the feed dog height adjustment is realized, and the adaptability of the sewing machine to different sewing materials is greatly enhanced.
Description
Technical Field
The invention relates to a feed tooth lifting tooth height adjustable mechanism.
The invention also relates to a sewing machine comprising the feeding tooth lifting tooth height adjusting mechanism.
Background
As shown in fig. 1, various sewing machines on the market at present include a main shaft 100 driven by a main motor to rotate, a thread frame 200, a feeding thread 300 installed on the thread frame 200, a thread lifting mechanism 400 connected between the main shaft 100 and one end of the thread frame 200, and a feeding mechanism 500 connected between the main shaft 100 and the other end of the thread frame 200, wherein the main shaft 100 drives the thread frame 200 and the feeding thread 300 to reciprocate up and down through the thread lifting mechanism 400, and the main shaft 100 drives the thread frame 200 and the feeding thread 300 to reciprocate back and forth through the feeding mechanism 500. Therefore, the feed dog 300 performs a compound motion of up-down reciprocating motion and back-and-forth reciprocating motion, and the motion track thereof is similar to an ellipse, as shown in fig. 2. Further, as shown in fig. 1, the feed lifting mechanism 400 includes a feed lifting shaft 401 parallel to the main shaft 100, a feed lifting eccentric 402 fixed to the main shaft 100, a feed lifting connecting rod 403, and a feed lifting crank 404 and a feed lifting fork 405 fixed to both ends of the feed lifting shaft 401 by screws, wherein both upper and lower ends of the feed lifting connecting rod 403 are connected to the feed lifting eccentric 402 and the feed lifting crank 404, respectively, and the feed lifting fork 405 is connected to the dental articulator 200 by a slider.
In the existing sewing machine shown in fig. 1, the transmission ratio of the main shaft 100 to the tooth frame 200 in the whole transmission process is fixed, so that the tooth lifting height of the feed tooth 300 (i.e. the distance from the upper surface of the needle plate when the feed tooth moves to the highest point) in the sewing machine is a fixed value, i.e. the highest point value in the operation process of the feed tooth 300 is fixed, and is set according to the machine type assembly process, and the tooth lifting height of the feed tooth 300 set by the method is generally the standard height. However, in order to adapt to different sewing material thicknesses, the feed lifting tooth height is often required to be adjusted, and the current method for adjusting the feed lifting tooth height is as follows: the screws for fixing the feed lifting fork 405 and the feed lifting shaft 401 in fig. 1 are loosened manually, the installation position of the feed lifting fork 405 relative to the feed lifting shaft 401 is adjusted by using a special measuring tool, the screws are screwed down after the adjustment is finished, and the feed lifting fork 405 is locked and fixed on the feed lifting shaft 401, so that different feed lifting heights are obtained. The adjusting process of the feed lifting tooth height of the feed feeding tooth is very complex, needs professional machine maintenance personnel to operate, and is not suitable for general sewing workers to operate, so that the labor intensity of the sewing workers is obviously improved, and the sewing experience is greatly reduced.
Particularly, after the height of the feed lifting teeth is adjusted in the above manner, the swing amplitude of the feed lifting teeth shaft is not changed, but only the mounting position of the feed lifting teeth fork on the feed lifting teeth shaft is changed, so that the movement track of the feed lifting teeth is inevitably moved up or down integrally, and the feed needle pitch of the sewing machine is changed simultaneously when the height of the feed lifting teeth is adjusted. The specific analysis is as follows: the motion trail of the feeding teeth integrally moves up or down, and the change of the motion trail of the feeding teeth is shown in figure 3; as can be seen from fig. 3: when the motion track of the feeding tooth moves downwards integrally and the tooth lifting height of the feeding tooth is reduced from the standard height Z1(1.0mm) to Z2(0.8mm), the motion track of the feeding tooth is changed from the graph in FIG. 3b to the graph in FIG. 3a, and at the moment, the feeding needle pitch of the sewing machine is reduced from the standard needle pitch X1 to X2; when the motion track of the feeding tooth moves upwards integrally and the tooth lifting height of the feeding tooth is increased from the standard height Z1(1.0mm) to Z3(1.2mm), the motion track of the feeding tooth is changed from figure 3b to figure 3c, and at the moment, the feeding needle pitch of the sewing machine is increased from the standard needle pitch X1 to X3. Thus, the following steps are carried out: in the prior art, the feed lifting tooth height of the feed lifting tooth is adjusted by changing the mounting position of the feed lifting tooth fork on the feed lifting tooth shaft, but the feed needle pitch of the sewing machine is changed, so that the sewing quality is influenced.
Particularly, the feed lifting tooth height cannot be increased without limit in the above adjusting manner, and after the feed lifting tooth height is adjusted to a certain height, if the feed lifting tooth height is increased continuously, for example, to the feed lifting tooth height Z in the view shown in fig. 4, at this time, the needle pitch of the sewing machine is X, when the feed lifting tooth moves to the regions P1 and P2 in fig. 4, a phenomenon that the feed lifting tooth pulls the sewing material backward and reversely occurs, which affects the sewing quality, and also limits the maximum value of the feed lifting tooth height of the feed lifting tooth.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide a feed dog feed lifting height adjustable mechanism.
In order to achieve the purpose, the invention provides a feeding tooth lifting tooth height adjustable mechanism which comprises a main shaft, a lifting tooth shaft parallel to the main shaft, a tooth frame, a feeding tooth arranged on the tooth frame, a first lifting tooth transmission assembly connected between the main shaft and the lifting tooth shaft, and a second lifting tooth transmission assembly connected between the lifting tooth shaft and the tooth frame, wherein the first lifting tooth transmission assembly comprises a lifting tooth eccentric wheel sleeved on the main shaft, a lifting tooth eccentric adjusting assembly connected with the main shaft and the lifting tooth eccentric wheel, a lifting tooth connecting rod and a lifting tooth crank fixed on the lifting tooth shaft; when the feed dog height is adjusted, the main shaft is rotated, and the eccentric feed dog amount L between the matching center O1 of the eccentric feed dog wheel and the feed dog connecting rod and the rotation center O2 of the main shaft is changed through the eccentric feed dog adjusting component.
Furthermore, the eccentric adjusting assembly of the lifting tooth comprises a ratchet wheel, an adjusting slide piece with a pawl part, an adjusting eccentric wheel, an adjusting slide block, a fixed slide block and a lifting tooth adjusting button, wherein the ratchet wheel and the fixed slide block are fixedly sleeved on the main shaft, the adjusting eccentric wheel is provided with a first slide groove in sliding fit with the adjusting slide piece and a first eccentric part extending back to the adjusting slide piece, the lifting tooth eccentric wheel is provided with a second slide groove in sliding fit with the fixed slide block and a second eccentric part extending back to the fixed slide block, the main shaft, the first eccentric part, the adjusting slide block, the second eccentric part and the lifting tooth connecting rod are sequentially sleeved along the radial direction of the main shaft from inside to outside, the outer peripheral surface of the adjusting slide block is provided with a first matching plane, and the inner peripheral surface of the second eccentric part is provided with a second matching plane matched with the first matching plane; when the tooth lifting adjusting button does not act on the adjusting slide piece, a pawl part on the adjusting slide piece is meshed with a ratchet on the ratchet wheel; when the lifting tooth adjusting button acts on the adjusting sliding piece, the adjusting sliding piece slides along the first sliding groove, so that the pawl part on the adjusting sliding piece is separated from the ratchet on the ratchet wheel, and then the main shaft is rotated to change the eccentric amount L of the lifting tooth.
Furthermore, the eccentric lifting adjusting assembly comprises a ratchet wheel, an adjusting slip sheet with a pawl part, an adjusting eccentric wheel, a small eccentric wheel, a fixed wheel and a lifting adjusting button, wherein the ratchet wheel and the fixed wheel are fixedly sleeved on the main shaft, the adjusting eccentric wheel is provided with a first sliding chute in sliding fit with the adjusting slip sheet and a first eccentric part extending back to the adjusting slip sheet, the lifting eccentric wheel is provided with a mounting hole for mounting the small eccentric wheel and a second eccentric part extending back to the mounting hole, the fixed wheel is provided with an eccentric bulge matched with an eccentric hole in the small eccentric wheel, and the main shaft, the first eccentric part, the second eccentric part and the lifting connecting rod are sequentially sleeved from inside to outside along the radial direction of the main shaft; when the tooth lifting adjusting button does not act on the adjusting slide piece, a pawl part on the adjusting slide piece is meshed with a ratchet on the ratchet wheel; when the lifting tooth adjusting button acts on the adjusting sliding piece, the adjusting sliding piece slides along the first sliding groove, so that the pawl part on the adjusting sliding piece is separated from the ratchet on the ratchet wheel, and then the main shaft is rotated to change the eccentric amount L of the lifting tooth.
Furthermore, a pre-tightening torsion spring is installed on the end face, facing the ratchet wheel, of the adjusting eccentric wheel, and two ends of the pre-tightening torsion spring are connected with the adjusting eccentric wheel and the adjusting sliding piece respectively.
Furthermore, a hand wheel is fixedly mounted at the end part of the main shaft.
Furthermore, the second tooth lifting transmission assembly comprises a tooth lifting sliding block and a tooth lifting swing fork fixed on the tooth lifting shaft, the tooth lifting sliding block is hinged with the tooth frame, a third sliding groove is formed in the tooth lifting swing fork, and the tooth lifting sliding block is located in the third sliding groove and in sliding fit with the third sliding groove.
The application also provides a sewing machine, install as above in the sewing machine pay-off tooth lifting teeth height-adjustable mechanism.
As mentioned above, the feeding tooth lifting tooth height adjustable mechanism and the sewing machine provided by the invention have the following beneficial effects:
the eccentric cam lifting device can change the eccentric cam lifting amount L between the matching center O1 of the eccentric cam lifting cam and the connecting rod lifting cam and the rotation center O2 of the main shaft, and sequentially changes the transmission efficiency between the main shaft and the lifting cam shaft, so that the swinging amplitude of the main shaft driving the lifting cam shaft to swing is changed, the adjustment of the height of the feeding cam lifting cam is realized, the universality of the sewing machine is greatly improved, the adaptability of the sewing machine to different sewing materials is greatly enhanced, and the competitiveness of a product is improved; particularly, the adjustment of the height of the lifting tooth is realized by changing the swing of the lifting tooth shaft, the needle pitch cannot be changed while the height of the lifting tooth is adjusted, and the sewing quality is ensured.
Drawings
Fig. 1 is a schematic view showing a structure of a sewing machine in the prior art.
Fig. 2 is a schematic diagram of the motion track of the feeding tooth in fig. 1.
Fig. 3 is a schematic diagram of a change of a motion track of a feed dog caused by changing the installation position of a feed dog fork on a feed dog shaft in the prior art.
Fig. 4 is a schematic diagram of a movement track of a feeding tooth with an excessively high tooth lifting height in the prior art.
Fig. 5 is a schematic structural diagram of a first feeding tooth lifting height adjusting mechanism according to an embodiment of the present application.
Fig. 6 to 8 are schematic views illustrating the connection between the main shaft, the eccentric cam of the lifting tooth, and the eccentric adjustment assembly of the lifting tooth in fig. 5.
Fig. 9 is a schematic diagram of adjusting the feed dog lifting height of fig. 5.
Fig. 10 is a schematic structural view of a second feeding tooth lifting tooth height adjusting mechanism in the present application.
FIG. 11 is a schematic view of the connection between the main shaft, the cam, and the cam adjustment assembly of FIG. 10.
Fig. 12 is a schematic view illustrating adjustment of the feed dog lifting height in fig. 10.
Fig. 13 is a graph showing the change of the motion trajectory of the feeding teeth in the present application.
Description of the element reference numerals
10 spindle
20 lifting tooth shaft
30 dental articulator
40 feeding tooth
50 first tooth lifting transmission assembly
51 eccentric cam of lifting tooth
511 second chute
512 second eccentric part
513 second mating plane
514 mounting hole
52 lifting tooth connecting rod
53 lifting rock shaft crank
60 second feed dog transmission assembly
61 lifting tooth slide block
62 lifting tooth swing fork
621 the third chute
70 eccentric adjusting assembly of tooth lifting
71 ratchet wheel
72 regulating sliding vane
721 pawl part
73 adjusting eccentric wheel
731 first chute
732 first eccentric part
74 adjusting slide block
741 first mating plane
75 fixed slide block
76 lifting tooth adjusting button
77 small eccentric wheel
78 fixed wheel
79 pre-tightening torsion spring
80 hand wheel
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.
It should be understood that the structures, proportions, and dimensions shown in the drawings and described herein are for illustrative purposes only and are not intended to limit the scope of the present invention, which is defined by the claims, but rather by the claims. In addition, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are used for descriptive purposes only and are not intended to limit the scope of the present invention, and the relative relationship between the terms may be changed or adjusted without substantial technical change.
The present application provides a sewing machine, such as a flat bed sewing machine. For convenience of description, the following embodiments define the directions as follows: as shown in fig. 5, the axial direction of the main shaft 10 in the sewing machine is defined as a left-right direction, the direction of the main shaft 10 toward the head of the sewing machine is a left direction (i.e., the right side of the paper surface in the view of fig. 5), and the direction of the main shaft 10 toward the tail of the sewing machine is a right direction (i.e., the left side of the paper surface in the view of fig. 5); the moving direction of the sewing material when the sewing machine sews is defined as the front direction.
The flat sewing machine is provided with a feed tooth lifting height adjusting mechanism for adjusting the lifting height of the feed tooth 40. As shown in fig. 5 or 10, the feed lifting tooth height adjustable mechanism according to the present invention includes a main shaft 10 extending left and right, a lifting tooth shaft 20 parallel to the main shaft 10, a tooth frame 30, a feed lifting tooth 40 mounted on the tooth frame 30, a first lifting tooth transmission assembly 50 connected between the main shaft 10 and the lifting tooth shaft 20, and a second lifting tooth transmission assembly 60 connected between the lifting tooth shaft 20 and the tooth frame 30, wherein the first lifting tooth transmission assembly 50, the lifting tooth shaft 20, and the second lifting tooth transmission assembly 60 constitute a lifting tooth mechanism in a lockstitch sewing machine. Specifically, the first feed lifting transmission assembly 50 comprises a feed lifting eccentric wheel 51 sleeved on the main shaft 10, a feed lifting eccentric adjusting assembly 70 connected with the main shaft 10 and the feed lifting eccentric wheel 51, a feed lifting connecting rod 52, and a feed lifting crank 53 fixedly locked on the feed lifting shaft 20 through a screw, wherein the upper end of the feed lifting connecting rod 52 is rotatably sleeved on the periphery of the feed lifting eccentric wheel 51, and the lower end of the feed lifting connecting rod 52 is hinged with the feed lifting crank 53; the distance between the matching center O1 of the cam eccentric 51 and the cam connecting rod 52 and the rotation center O2 of the main shaft 10 is the cam eccentric amount L.
When the sewing machine sews normally, the cam eccentric adjusting component 70 keeps the relative positions of the cam connecting rod 52, the cam eccentric wheel 51 and the main shaft 10, thereby keeping the cam eccentric amount L unchanged; a main motor in the flat sewing machine drives a main shaft 10 to rotate, the main shaft 10 drives a feed lifting tooth shaft 20 to periodically reciprocate through a first feed lifting tooth transmission assembly 50, and the feed lifting tooth shaft 20 drives a tooth frame 30 and a feed tooth 40 to reciprocate up and down through a second feed lifting tooth transmission assembly 60. Therefore, the main shaft 10 drives the feeding teeth 40 fixed on the tooth frame 30 to do a periodic up-and-down reciprocating motion through the tooth lifting mechanism; the motion amplitude of the up-and-down motion of the feeding tooth 40 is directly related to the swing amplitude of the feed lifting tooth shaft 20, and the feed lifting tooth eccentricity L directly influences the swing amplitude of the main shaft 10 driving the feed lifting tooth shaft 20 to swing in one period. Because the eccentric amount L of the feed lifting teeth is kept unchanged, the transmission efficiency between the main shaft 10 and the feed lifting teeth shaft 20 is also kept unchanged, namely the swinging amplitude of the main shaft 10 driving the feed lifting teeth shaft 20 to swing is kept unchanged, and the feed lifting teeth height of the feed feeding teeth 40 is also constant and kept unchanged. When the feed dog height of the feed dog 40 needs to be adjusted, the main motor of the sewing machine stops running, the main shaft 10 is rotated, and under the action of the feed dog eccentric adjusting assembly 70, the relative positions of the feed dog connecting rod 52, the feed dog eccentric wheel 51 and the main shaft 10 are changed, that is, the feed dog eccentric amount L between the matching center O1 of the feed dog eccentric wheel 51 and the feed dog connecting rod 52 and the rotation center O2 of the main shaft 10 is changed, so that the transmission efficiency between the main shaft 10 and the feed dog shaft 20 is changed, that is, the swinging amplitude of the feed dog shaft 20 driven by the main shaft 10 to swing is changed, and the adjustment of the feed dog height is realized.
Further, the present application adjusts the feed dog height of the feed dog 40 based on changing the feed dog eccentricity L, which enables the movement locus of the feed dog 40 to be changed only in the vertical direction with respect to the upper surface of the needle plate in an equal ratio, as shown in fig. 13. Specifically, in the movement locus diagram of the feed dog 40 shown in fig. 13, the Z direction indicates the tooth lifting height of the feed dog 40, the X direction indicates the needle pitch, and L indicates the upper surface of the needle plate; the tooth height corresponding to the curve S1 in fig. 13 is 1.0 mm. When the spindle 10 is rotated and the eccentric amount L of the feed lifting teeth is reduced by the feed lifting teeth eccentric adjusting assembly 70, the swing amplitude of the feed lifting teeth shaft 20 can be reduced, the motion track of the feed feeding teeth 40 is changed from a curve S1 in fig. 13 to a curve S3, the feed lifting teeth height of the feed feeding teeth 40 is reduced from 1.0mm corresponding to a curve S1 to 0.8mm corresponding to a curve S3, the feed lifting teeth are suitable for sewing thin materials, and the wrinkling phenomenon of the sewing materials can be improved. When the spindle 10 is rotated and the eccentric amount L of the feed lifting teeth is increased through the feed lifting teeth eccentric adjusting assembly 70, the swing amplitude of the feed lifting teeth shaft 20 can be increased, the motion track of the feed feeding teeth 40 is changed from a curve S1 in fig. 13 to a curve S2, the height of the feed lifting teeth of the feed feeding teeth 40 is increased from 1.0mm corresponding to a curve S1 to 1.2mm corresponding to a curve S2, the feed lifting teeth are suitable for thick material sewing and over-peduncle sewing, the feed efficiency can be effectively improved, and the feed is smoother. As can be seen from fig. 13: in the application, when the feed dog height of the feed dog 40 is adjusted, the motion track of the feed dog 40 does not move up or down as a whole, but only changes the amplitude in the vertical direction, but does not change the amplitude in the front-back direction, so that the needle pitch of the sewing machine is kept unchanged in the process of adjusting the feed dog height, the sewing quality is not influenced, and the phenomenon that the feed dog 40 drags back sewing materials is avoided. Therefore, the height of the feed dog 40 can be adjusted within a certain range, the feed dog is in stepless adjustment, the needle pitch cannot be changed while the height of the feed dog is adjusted, the sewing machine can have different heights of the feed dog according to sewing materials of different specifications, the sewing quality can be effectively guaranteed, the adaptability of the sewing machine to different sewing materials is improved, the universality of the sewing machine is greatly improved, and the competitiveness of products is improved.
As shown in fig. 5, a hand wheel 80 is fixedly installed at the right end of the main shaft 10, and when the sewing machine is stopped to adjust the height of the lifting tooth, the main shaft 10 can be conveniently rotated by rotating the hand wheel 80, so that the eccentric amount L of the lifting tooth can be changed by the lifting tooth eccentric adjusting assembly 70. Additionally, there are a number of ways in which the eccentric adjustment assembly 70 may be implemented, and two preferred embodiments of the eccentric adjustment assembly 70 are provided as follows.
First embodiment of the eccentric adjustment assembly 70,
As shown in fig. 6 to 8, an embodiment of the eccentric adjustment assembly 70 for the lifting tooth includes a ratchet wheel 71, an adjustment slide 72 having a pawl portion 721 at a lower end thereof, an adjustment eccentric 73, an adjustment slide 74, a fixed slide 75, and a lifting tooth adjustment button 76, wherein the ratchet wheel 71, the adjustment slide 72, the adjustment eccentric 73, the eccentric 51 for the lifting tooth, and the fixed slide 75 are sequentially arranged from left to right along an axial direction of the main shaft 10. Wherein, the ratchet 71 and the fixed slide block 75 are fixedly sleeved on the main shaft 10 through screws; a circle of ratchets are arranged at the left end of the ratchet wheel 71; a first sliding groove 731 is formed in the right end face of the adjusting eccentric wheel 73, and the adjusting sliding piece 72 is located in the first sliding groove 731 and is in sliding fit with the first sliding groove 731; a long groove is formed in the adjusting sliding piece 72, the extending direction of the long groove is consistent with the extending direction of the first sliding groove 731, and when the adjusting sliding piece 72 slides in the first sliding groove 731, the main shaft 10 is prevented from interfering the sliding of the adjusting sliding piece 72 through the long groove; the left end of the adjusting eccentric wheel 73 is provided with a first eccentric part 732 extending leftwards in the direction back to the adjusting slide sheet 72; the left end of the eccentric cam 51 of the lifting tooth is provided with a second chute 511 which is in sliding fit with the fixed slide block 75, and the right end of the eccentric cam 51 of the lifting tooth is provided with a second eccentric part 512 which extends rightwards in a direction opposite to the direction of the fixed slide block 75; the inner periphery of the first eccentric part 732 is matched with the main shaft 10, the outer periphery is matched with the inner periphery of the adjusting slide block 74, the inner periphery of the second eccentric part 512 is matched with the adjusting slide block 74, and the outer periphery is matched with the inner periphery of the upper end of the tooth lifting connecting rod 52, namely, the main shaft 10, the first eccentric part 732 of the adjusting eccentric wheel 73, the adjusting slide block 74, the second eccentric part 512 of the tooth lifting eccentric wheel 51 and the upper end of the tooth lifting connecting rod 52 are sequentially sleeved and matched from inside to outside along the radial direction of the main shaft 10; a first fitting plane 741 is disposed on an outer circumferential surface of the adjustment slider 74, and a second fitting plane 513 fitted with the first fitting plane 741 is disposed on an inner circumferential surface of the second eccentric portion 512; the tooth lifting adjustment button 76 is provided above the adjustment slide 72, and is capable of acting on the adjustment slide 72 to slide the adjustment slide 72 in the first slide groove 731.
In the first embodiment of the feed dog eccentric adjustment assembly 70, when the feed dog 40 does not need to be adjusted in height, the feed dog adjustment button 76 does not act on the adjustment slide 72, the position of the adjustment slide 72 in the first slide groove 731 is not changed, and at this time, the pawl portion 721 on the adjustment slide 72 is engaged with the ratchet teeth on the ratchet wheel 71. When the lockstitch sewing machine sews normally, the main shaft 10 and the ratchet wheel 71 are fixed, the two are relatively static, the adjusting sliding piece 72 is static relative to the main shaft 10 by the engagement of the pawl part 721 on the adjusting sliding piece 72 and the ratchet on the ratchet wheel 71, the adjusting sliding piece 72 is positioned in the first sliding groove 731 of the adjusting eccentric wheel 73, the first sliding groove 731 also plays a limiting role, so the adjusting eccentric wheel 73 is static relative to the main shaft 10 along with the adjusting sliding piece 72; meanwhile, the main shaft 10 and the fixed slide block 75 are fixed and are relatively static, and the fixed slide block 75 is positioned in the second chute 511 of the eccentric cam 51, so that the eccentric cam 51 is static relative to the main shaft 10 along with the fixed slide block 75; therefore, the ratchet wheel 71, the adjusting slide piece 72, the adjusting eccentric wheel 73, the adjusting slide block 74, the fixed slide block 75 and the cam wheel 51 rotate together with the main shaft 10, the cam wheel 51 drives the cam connecting rod 52 to move, the cam connecting rod 52 drives the cam shaft 20 to periodically reciprocate through the cam crank 53, and the cam shaft 20 drives the tooth rack 30 and the feeding tooth 40 to periodically reciprocate up and down through the second cam transmission assembly 60. Because the adjusting eccentric wheel 73 and the lifting tooth eccentric wheel 51 are relatively static, the lifting tooth eccentric amount L between the matching center O1 of the lifting tooth eccentric wheel 51 and the lifting tooth connecting rod 52 and the rotation center O2 of the main shaft 10 is kept unchanged, so that the up-and-down movement amplitude of the feeding tooth 40 is constant, and the lifting tooth height is kept unchanged.
In the first embodiment of the tooth lifting eccentric adjusting assembly 70, when the tooth lifting height of the feeding tooth 40 needs to be adjusted, the tooth lifting adjusting button 76 is pressed, so that the lower end of the tooth lifting adjusting button 76 acts on the adjusting slide piece 72 to cause the adjusting slide piece 72 to slide downwards along the first slide groove 731, and further to cause the pawl part 721 on the adjusting slide piece 72 to be disengaged from the ratchet teeth on the ratchet wheel 71; then, the hand wheel 80 is manually rotated to drive the main shaft 10 to rotate together, the main shaft 10 drives the fixed slide block 75 and the tooth lifting eccentric wheel 51 to rotate together, the adjusting slide block 74 rotates together with the second eccentric part 512 of the tooth lifting eccentric wheel 51 under the mutual matching action of the first matching plane 741 and the second matching plane 513, and the adjusting slide block 72 is still under the limit of the tooth lifting adjusting button 76, so that the adjusting eccentric wheel 73 is still together with the adjusting slide block 72; therefore, when the main shaft 10 is rotated by rotating the hand wheel 80, the fixed slider 75 drives the second eccentric portion 512 of the cam 51 to rotate relatively around the first eccentric portion 732 of the adjusting eccentric 73, as shown in fig. 9, so as to change the cam eccentricity L between the matching center O1 of the cam eccentric 51 and the cam connecting rod 52 and the rotation center O2 of the main shaft 10, thereby directly changing the swing amplitude of the cam shaft 20 driven by the main shaft 10 to swing, and realizing the adjustment of the feed cam height.
Second embodiment of the eccentric adjustment assembly 70,
As shown in fig. 10 and 11, the embodiment of the eccentric adjustment assembly 70 for lifting teeth includes a ratchet wheel 71, an adjustment slide 72 having a pawl portion 721 at a lower end thereof, an adjustment eccentric 73, a small eccentric 77, a fixed wheel 78, and a lifting teeth adjustment button 76, wherein the ratchet wheel 71, the adjustment slide 72, the adjustment eccentric 73, the eccentric 51 for lifting teeth, and the fixed wheel 78 are sequentially arranged from left to right along the axial direction of the main shaft 10. Wherein, the ratchet wheel 71 and the fixed wheel 78 are fixedly sleeved on the main shaft 10 through screws; a circle of ratchets are arranged at the left end of the ratchet wheel 71; a first sliding groove 731 is formed in the right end face of the adjusting eccentric wheel 73, and the adjusting sliding piece 72 is located in the first sliding groove 731 and is in sliding fit with the first sliding groove 731; the adjusting sliding piece 72 is provided with a long strip groove, the extending direction of the long strip groove is consistent with the extending direction of the first sliding groove 731, and when the adjusting sliding piece 72 slides in the first sliding groove 731, the main shaft 10 is prevented from interfering the sliding of the adjusting sliding piece 72 through the long strip groove; the left end of the adjusting eccentric wheel 73 is provided with a first eccentric part 732 extending leftwards in the direction back to the adjusting slide sheet 72; the left end of the eccentric cam 51 of the lifting tooth is provided with a mounting hole 514 for mounting the small eccentric cam 77, and the right end of the eccentric cam 51 of the lifting tooth is provided with a second eccentric part 512 extending rightwards in a direction opposite to the mounting hole 514; an eccentric protrusion protruding rightwards is arranged on the right end face of the fixed wheel 78, the eccentric protrusion is matched with an eccentric hole in the small eccentric wheel 77, and the eccentric hole in the small eccentric wheel 77 is formed in a manner that the hole is eccentrically arranged relative to the center of the small eccentric wheel 77; the inner periphery of the first eccentric part 732 is matched with the main shaft 10, the outer periphery of the first eccentric part 732 is matched with the inner periphery of the second eccentric part 512, and the outer periphery of the second eccentric part 512 is matched with the inner periphery of the upper end of the tooth lifting connecting rod 52, namely the main shaft 10, the first eccentric part 732 of the adjusting eccentric wheel 73, the second eccentric part 512 of the tooth lifting eccentric wheel 51 and the tooth lifting connecting rod 52 are sequentially sleeved from inside to outside along the radial direction of the main shaft 10; the tooth lifting adjustment button 76 is provided above the adjustment slide 72, and is capable of acting on the adjustment slide 72 to slide the adjustment slide 72 in the first slide groove 731.
In the second embodiment of the feed dog eccentric adjusting assembly 70, when the feed dog 40 does not need to be adjusted in height, the feed dog adjusting button 76 does not act on the adjusting slide 72, the position of the adjusting slide 72 in the first slide groove 731 is not changed, and at this time, the pawl portion 721 on the adjusting slide 72 is engaged with the ratchet teeth on the ratchet wheel 71. When the lockstitch sewing machine sews normally, the main shaft 10 and the ratchet wheel 71 are fixed, the two are relatively static, the adjusting sliding piece 72 is static relative to the main shaft 10 by the engagement of the pawl part 721 on the adjusting sliding piece 72 and the ratchet on the ratchet wheel 71, the adjusting sliding piece 72 is positioned in the first sliding groove 731 of the adjusting eccentric wheel 73, the first sliding groove 731 also plays a limiting role, so the adjusting eccentric wheel 73 is static relative to the main shaft 10 along with the adjusting sliding piece 72; meanwhile, the main shaft 10 and the fixed wheel 78 are fixed and are relatively static, the fixed wheel 78 is relatively static with the eccentric cam 51 through the small eccentric wheel 77, and therefore the eccentric cam 51 is static relative to the main shaft 10 along with the fixed wheel 78; therefore, the ratchet wheel 71, the adjusting slide 72, the adjusting eccentric wheel 73, the fixed wheel 78 and the cam 51 rotate together with the main shaft 10, the cam connecting rod 52 is driven by the cam 51 to move, the cam connecting rod 52 drives the cam shaft 20 to periodically reciprocate by the cam crank 53, and the cam shaft 20 drives the tooth rack 30 and the feed tooth 40 to periodically reciprocate up and down by the second cam transmission assembly 60. Because the adjusting eccentric wheel 73 and the lifting tooth eccentric wheel 51 are relatively static, the lifting tooth eccentric amount L between the matching center O1 of the lifting tooth eccentric wheel 51 and the lifting tooth connecting rod 52 and the rotation center O2 of the main shaft 10 is kept unchanged, so that the up-and-down movement amplitude of the feeding tooth 40 is constant, and the lifting tooth height is kept unchanged.
In the second embodiment of the tooth lifting eccentric adjusting assembly 70, when the tooth lifting height of the feeding tooth 40 needs to be adjusted, the tooth lifting adjusting button 76 is pressed, so that the lower end of the tooth lifting adjusting button 76 acts on the adjusting slide piece 72 to urge the adjusting slide piece 72 to slide downwards along the first slide slot 731, and further urge the pawl part 721 on the adjusting slide piece 72 to disengage from the ratchet teeth on the ratchet wheel 71; then, the hand wheel 80 is manually rotated to drive the main shaft 10 to rotate together, as shown in fig. 12, the main shaft 10 drives the fixed wheel 78 to rotate together, the fixed wheel 78 drives the tooth lifting eccentric wheel 51 to rotate through the matching of the eccentric protrusion and the small eccentric wheel 77, but the rotation amplitude of the tooth lifting eccentric wheel 51 is different from that of the fixed wheel 78, and the adjusting slide sheet 72 is stationary under the limit of the tooth lifting adjusting button 76, so that the adjusting eccentric wheel 73 is stationary along with the adjusting slide sheet 72; therefore, the main shaft 10 is rotated by rotating the hand wheel 80, and the feed lifting tooth eccentric amount L between the matching center O1 of the lifting tooth eccentric wheel 51 and the lifting tooth connecting rod 52 and the rotation center O2 of the main shaft 10 can be changed, so that the swing amplitude of the main shaft 10 driving the lifting tooth shaft 20 to swing is directly changed, and the height of the feed lifting tooth is adjusted. In fig. 12, point a is the center of the eccentric projection of the cam 51, i.e., the center of the eccentric hole of the small eccentric cam 77, point B is the center of the small eccentric cam 77, and point C is the center of the first eccentric portion 732.
In the two embodiments of the eccentric adjustment assembly 70, the adjusting eccentric wheel 73 is provided with a pre-tightening torsion spring 79 on the right end surface facing the ratchet wheel 71, and two ends of the pre-tightening torsion spring 79 are respectively connected with the adjusting eccentric wheel 73 and the adjusting slide 72; when the lifting tooth adjusting button 76 is not pressed down, the ratchet teeth on the ratchet wheel 71 and the ratchet pawl part 721 on the adjusting slide piece 72 are kept in an engaged state by pre-tightening the spring force of the torsion spring 79; when the lifting tooth adjusting button 76 is pressed, the adjusting slide 72 is moved downward against the spring force of the pretensioned torsion spring 79, and the pawl portion 721 on the adjusting slide 72 is disengaged from the ratchet teeth on the ratchet wheel 71. In addition, a feeding eccentric part extending rightwards can be arranged at the right end of the ratchet wheel 71 and is used for being matched with a feeding connecting rod in a feeding mechanism, so that the ratchet wheel 71 simultaneously forms a feeding eccentric wheel, and the whole structure of the lockstitch sewing machine is more compact.
Further, as shown in fig. 5, the second tooth lifting transmission assembly 60 in the tooth lifting mechanism includes a tooth lifting slider 61 and a tooth lifting swing fork 62 fixedly locked on the tooth lifting shaft 20 by a screw, the tooth lifting slider 61 is hinged with the tooth frame 30 by a pin extending left and right, a third sliding slot 621 is formed in the tooth lifting swing fork 62, and the tooth lifting slider 61 is located in the third sliding slot 621 and is in sliding fit with the third sliding slot 621.
In conclusion, the present invention effectively overcomes various disadvantages of 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 (5)
1. The utility model provides a pay-off tooth lifting height adjustable mechanism, includes main shaft (10), is on a parallel with the lifting tooth axle (20) of main shaft (10), tooth frame (30), installs pay-off tooth (40) on tooth frame (30), connects first lifting tooth drive assembly (50) between main shaft (10) and lifting tooth axle (20), connects second lifting tooth drive assembly (60) between lifting tooth axle (20) and tooth frame (30), its characterized in that: the first tooth lifting transmission assembly (50) comprises a tooth lifting eccentric wheel (51) sleeved on the main shaft (10), a tooth lifting eccentric adjusting assembly (70) connected with the main shaft (10) and the tooth lifting eccentric wheel (51), a tooth lifting connecting rod (52) and a tooth lifting crank (53) fixed on a tooth lifting shaft (20), one end of the tooth lifting connecting rod (52) is rotatably sleeved on the periphery of the tooth lifting eccentric wheel (51), the matching center of the tooth lifting eccentric wheel (51) and the tooth lifting connecting rod (52) is O1, and the other end of the tooth lifting connecting rod (52) is hinged to the tooth lifting crank (53); when the feed dog height of the feed dog (40) is adjusted, the main shaft (10) is rotated, and the eccentric amount L of the feed dog between the matching center O1 and the rotation center O2 of the main shaft (10) is changed through the feed dog eccentric adjusting component (70);
the tooth lifting eccentric adjusting assembly (70) comprises a ratchet wheel (71), an adjusting slide piece (72) with a pawl part (721), an adjusting eccentric wheel (73), an adjusting slide block (74), a fixed slide block (75) and a tooth lifting adjusting button (76), wherein the ratchet wheel (71) and the fixed slide block (75) are fixedly sleeved on a main shaft (10), the adjusting eccentric wheel (73) is provided with a first slide groove (731) in sliding fit with the adjusting slide piece (72) and a first eccentric part (732) extending back to the adjusting slide piece (72), the tooth lifting eccentric wheel (51) is provided with a second slide groove (511) in sliding fit with the fixed slide block (75) and a second eccentric part (512) extending back to the fixed slide block (75), and the main shaft (10), the first eccentric part (732), the adjusting slide block (74), the second eccentric part (512) and a tooth lifting connecting rod (52) are sleeved in sequence from inside to outside along the radial direction of the main shaft (10), a first matching plane (741) is arranged on the outer peripheral surface of the adjusting slide block (74), and a second matching plane (513) matched with the first matching plane (741) is arranged on the inner peripheral surface of the second eccentric part (512); when the tooth lifting adjusting button (76) does not act on the adjusting slide piece (72), a pawl part (721) on the adjusting slide piece (72) is meshed with the ratchet on the ratchet wheel (71); when the tooth lifting adjusting button (76) acts on the adjusting slide piece (72), the adjusting slide piece (72) slides along the first sliding chute (731), so that a pawl part (721) on the adjusting slide piece (72) is separated from a ratchet on the ratchet wheel (71), and then the main shaft (10) is rotated to change the tooth lifting eccentric amount L.
2. The feed tooth lifting height adjustable mechanism of claim 1, characterized in that: and a pre-tightening torsion spring (79) is arranged on the end surface of the adjusting eccentric wheel (73) facing the ratchet wheel (71), and two ends of the pre-tightening torsion spring (79) are respectively connected with the adjusting eccentric wheel (73) and the adjusting slide sheet (72).
3. The feed dog feed lifting height adjustable mechanism of claim 1, wherein: and a hand wheel (80) is fixedly mounted at the end part of the main shaft (10).
4. The feed dog feed lifting height adjustable mechanism of claim 1, wherein: the second lifting tooth transmission assembly (60) comprises a lifting tooth sliding block (61) and a lifting tooth swinging fork (62) fixed on the lifting tooth shaft (20), the lifting tooth sliding block (61) is hinged with the tooth rack (30), a third sliding groove (621) is formed in the lifting tooth swinging fork (62), and the lifting tooth sliding block (61) is located in the third sliding groove (621) and is in sliding fit with the third sliding groove (621).
5. A sewing machine characterized by: the sewing machine is provided with a feed dog lifting tooth height adjustable mechanism as claimed in any one of claims 1 to 4.
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| CN201910905820.8A CN112626725B (en) | 2019-09-24 | 2019-09-24 | Feeding tooth lifting tooth height adjustable mechanism and sewing machine |
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| CN112626725B true CN112626725B (en) | 2022-08-23 |
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| CN109594208A (en) * | 2019-01-14 | 2019-04-09 | 安徽杰羽制鞋机械科技有限公司 | A kind of needle gage of sewing machine adjusts and falls automatically feeding structure |
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| GB1522422A (en) * | 1976-05-05 | 1978-08-23 | Singer Co | Feed mechanism for sewing machines |
| JP2000279670A (en) * | 1991-06-18 | 2000-10-10 | Brother Ind Ltd | Sewing machine |
| DE4316410A1 (en) * | 1992-06-19 | 1993-12-23 | Union Special Gmbh | Sewing machine feed dog mechanism |
| JPH10235047A (en) * | 1996-12-25 | 1998-09-08 | Brother Ind Ltd | Sewing machine |
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| CN104153131A (en) * | 2014-07-03 | 2014-11-19 | 杰克缝纫机股份有限公司 | Modified forked feed lifting rock shaft crank |
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| CN112626725A (en) | 2021-04-09 |
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