CN112626729A - Feed lifting tooth height intelligent adjusting mechanism and sewing machine - Google Patents
Feed lifting tooth height intelligent adjusting mechanism and sewing machine Download PDFInfo
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- CN112626729A CN112626729A CN201910905855.1A CN201910905855A CN112626729A CN 112626729 A CN112626729 A CN 112626729A CN 201910905855 A CN201910905855 A CN 201910905855A CN 112626729 A CN112626729 A CN 112626729A
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- lifting tooth
- lifting
- tooth
- feed
- height 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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- Textile Engineering (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
The invention provides a feed lifting tooth height intelligent adjusting mechanism and a sewing machine, wherein the feed lifting tooth height intelligent adjusting mechanism comprises a main shaft, a feed lifting tooth shaft parallel to the main shaft, a tooth frame, a feed feeding tooth arranged on the tooth frame, a first feed lifting tooth transmission assembly connected between the main shaft and the feed lifting tooth shaft, a second feed lifting tooth transmission assembly connected between the feed lifting tooth shaft and the tooth frame, a feed lifting tooth height adjusting drive source and a feed lifting tooth height adjusting assembly, wherein the feed lifting tooth height intelligent adjusting mechanism is connected with a transmission part in the first feed lifting tooth transmission assembly through the feed lifting tooth height adjusting assembly; when the feed lifting teeth height adjusting driving source acts, the feed lifting teeth shaft is driven to rotate through the transmission part, and the swing amplitude of the main shaft which drives the feed lifting teeth shaft to swing through the first feed lifting teeth transmission assembly is changed. This application can the height of automatically regulated pay-off tooth, and can move down below the faller with the pay-off tooth voluntarily when the peak blowing on the eedle, be favorable to promoting the sewing quality.
Description
Technical Field
The invention relates to an intelligent lifting tooth height adjusting mechanism.
The invention also relates to a sewing machine comprising the lifting tooth height intelligent 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 respectively fixed to both ends of the feed lifting shaft 401, wherein the feed lifting connecting rod 403 is connected to the feed lifting eccentric 402 and the feed lifting crank 404 at upper and lower ends thereof, and the feed lifting fork 405 is connected to the dental articulator 200 through a slider.
Furthermore, when the sewing machine is designed, a fixed distance exists between a presser foot and a needle plate of the sewing machine, the presser foot needs to be automatically or manually lifted upwards before sewing is started, then sewing materials are placed between the presser foot and the needle plate, at the moment, a machine needle of the sewing machine is at the highest position of the movement stroke of the machine needle, the machine needle is driven by a main shaft through a needle rod mechanism to move, and therefore the machine needle and a feeding tooth are in a linkage relation. When the needle moves upwards to the highest point of the movement stroke of the needle, the feeding teeth also move to the highest point, the feeding teeth can protrude upwards from the tooth grooves of the needle plate, and when the feeding teeth protrude upwards from the tooth grooves of the needle plate, the following defects can be caused when sewing materials are put into the needle plate: 1. the originally not wide distance between the needle plate and the presser foot becomes narrower, so that the sewing material is very labored when being placed between the presser foot and the needle plate, particularly thick material; 2. special seam materials can be scraped; 3. friction force exists between the feeding teeth and the sewing material, and the friction force can cause the phenomenon of layer staggering and layering of the sewing material; 4. when the sewing material starts to be sewn after being put in, the feeding teeth can drive the sewing material to move forward in advance, and the needle falling point is influenced. In conclusion, when the feeding tooth protrudes upwards from the tooth groove of the needle plate, sewing materials are put into the feeding tooth, so that the sewing quality is greatly reduced.
Further, in the conventional 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. However, different feed lifting tooth heights are required to improve the sewing level for different sewing materials in the existing market, and a sewing machine with the feed lifting tooth height being a fixed value obviously cannot meet the requirement, so that the market competitiveness of products is reduced.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide an intelligent feed lifting tooth height adjusting mechanism, which can automatically adjust the height of a feed lifting tooth and automatically lower the feed lifting tooth below a needle plate when a needle moves up to the highest point for feeding.
In order to achieve the purpose, the invention provides an intelligent lifting tooth height adjusting 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, a second lifting tooth transmission assembly connected between the lifting tooth shaft and the tooth frame, a lifting tooth height adjusting driving source and a lifting tooth height adjusting assembly, wherein the lifting tooth height adjusting driving source is connected with a transmission part in the first lifting tooth transmission assembly through the lifting tooth height adjusting assembly; when the feed lifting mechanism is used for adjusting the feed lifting height of the feed lifting mechanism, the feed lifting mechanism drives the feed lifting shaft to rotate through the transmission part, and changes the swing amplitude of the main shaft which drives the feed lifting shaft to swing through the first feed lifting transmission assembly.
Furthermore, the first lifting tooth transmission assembly comprises a lifting tooth eccentric wheel fixed on the main shaft, a lifting tooth connecting rod, a first sliding block and a first lifting tooth swinging fork fixed on the lifting tooth shaft, one end of the lifting tooth connecting rod is rotatably sleeved on the periphery of the lifting tooth eccentric wheel, the other end of the lifting tooth connecting rod is hinged with the first sliding block, a first sliding groove is formed in the first lifting tooth swinging fork, and the first sliding block is located in the first sliding groove and is in sliding fit with the first sliding groove.
Further, the lifting tooth height adjusting driving source is connected with the first sliding block through a lifting tooth height adjusting assembly; when the lifting tooth height adjusting driving source acts, the position of the first sliding block in the first sliding groove in the extending direction of the first sliding groove is changed.
Furthermore, the feed lifting height adjusting assembly comprises a rotating shaft driven to rotate by the feed lifting height adjusting driving source, a rotating crank fixed on the rotating shaft and a connecting plate, wherein one end of the connecting plate is hinged to the rotating crank, and the other end of the connecting plate is coaxially hinged to the feed lifting connecting rod and the first sliding block.
Furthermore, the lifting tooth height adjusting drive source is a motor, and an output shaft of the motor is connected with the rotating shaft through a coupler.
Furthermore, the first lifting tooth transmission assembly comprises a lifting tooth eccentric wheel, a lifting tooth connecting rod, a first lifting tooth swinging plate, a second lifting tooth swinging plate, a lifting tooth swinging seat with a fixed swinging fulcrum and a lifting tooth crank fixed on a lifting tooth shaft, wherein the lifting tooth eccentric wheel, the lifting tooth connecting rod, the first lifting tooth swinging plate and the second lifting tooth swinging plate are fixed on the main shaft, one end of the lifting tooth connecting rod is rotatably sleeved on the periphery of the lifting tooth eccentric wheel, the other end of the lifting tooth connecting rod, one end of the first lifting tooth swinging plate and one end of the second lifting tooth swinging plate are hinged coaxially, the other end of the first lifting tooth swinging plate is hinged with the lifting tooth swinging seat, and the other end of the second lifting tooth swinging plate is hinged with the lifting tooth crank.
Furthermore, the feed lifting height adjusting drive source is connected with the feed lifting swing seat through a feed lifting height adjusting assembly; when the lifting tooth height adjusting driving source acts, the position angle of the lifting tooth swinging seat is changed.
Furthermore, the lifting tooth height adjusting assembly comprises an adjusting crank and an adjusting connecting rod, wherein the adjusting crank and the adjusting connecting rod are driven by the lifting tooth height adjusting driving source to rotate, and two ends of the adjusting connecting rod are respectively hinged with the adjusting crank and the lifting tooth swinging seat.
Furthermore, the lifting tooth height adjusting driving source is a motor, and the adjusting crank is fixed on an output shaft of the motor.
Furthermore, the second lifting tooth transmission assembly comprises a second sliding block and a second lifting tooth swinging fork fixed on the lifting tooth shaft, the second sliding block is hinged with the tooth frame, a second sliding groove is formed in the second lifting tooth swinging fork, and the second sliding block is located in the second sliding groove and is in sliding fit with the second sliding groove.
The application also provides a sewing machine, install as above in the sewing machine lifting teeth height intelligent regulation mechanism.
Furthermore, the sewing machine further comprises an electric control module and a presser foot height detection unit for detecting the height of the presser foot, wherein the presser foot height detection unit comprises a detection sensor fixed with the machine shell and a sensed element fixed with the pressure rod, the detection sensor is matched with the sensed element, and the detection sensor and the lifting tooth height adjusting driving source are connected with the electric control module.
As mentioned above, the intelligent lifting tooth height adjusting mechanism and the sewing machine provided by the invention have the following beneficial effects:
in the application, the feed lifting height adjusting drive source acts on the transmission part through the feed lifting height adjusting assembly, and the feed lifting height is adjusted by changing the swinging amplitude of the feed lifting shaft driven by the main shaft to swing; meanwhile, when the sewing machine stops, the presser foot is lifted upwards, and the needle moves upwards to the highest point, the feed lifting tooth height adjusting driving source rotates by an angle, the feed lifting tooth shaft rotates by an angle through the feed lifting tooth height adjusting assembly and the transmission component, the feed lifting tooth shaft drives the tooth frame and the feed lifting tooth to move downwards through the second feed lifting tooth transmission assembly, the feed lifting tooth moves downwards to the position below the upper surface of the needle plate, and the feed lifting tooth does not interfere with the sewing materials to be placed between the presser foot and the needle plate. Therefore, the height of the feeding tooth can be automatically adjusted, the feeding tooth can be automatically lowered below the needle plate when the needle moves up to the highest point for discharging, and the sewing quality is favorably improved.
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 structural diagram of a first embodiment of an intelligent lifting tooth height adjusting mechanism in the present application.
Fig. 4 is an enlarged view of a circle a of fig. 3.
Fig. 5 is a schematic connection diagram of the feed lifting height adjusting drive source, the feed lifting height adjusting assembly and the first feed lifting transmission assembly in the present application.
Fig. 6 is an exploded view of fig. 5, with the feed dog shaft omitted from fig. 6 relative to fig. 5.
Fig. 7 is a schematic diagram of a first embodiment of the intelligent lifting tooth height adjusting mechanism in the present application.
Fig. 8 is a schematic structural diagram of a second embodiment of the intelligent lifting tooth height adjusting mechanism in the present application.
Fig. 9 is an enlarged view of circle B of fig. 8.
Fig. 10 is a schematic diagram of a second embodiment of the intelligent lifting tooth height adjusting mechanism in the present application.
Fig. 11 is a schematic structural view of a presser foot height detection unit according to the present application.
Fig. 12 is a graph showing the change of the motion trajectory of the feeding teeth in the present application.
Fig. 13 is a schematic view of the structure of the sewing machine of the present application.
Fig. 14 is a state view of a prior art sewing machine at the time of thread trimming.
Fig. 15 is a state view of the sewing machine in the present application at the time of thread cutting.
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
52 lifting tooth connecting rod
53 first slide
54 first feed dog swing fork
541 first chute
55 first connecting pin
56 first lifting tooth swing plate
57 second lifting teeth swinging plate
58 lifting tooth swing seat
59 lifting rock shaft crank
510 supporting pin
60 second feed dog transmission assembly
61 second slide
62 second feed dog swing fork
621 second chute
63 second connecting pin
70 lifting tooth height adjusting driving source
80 lifting tooth height adjusting assembly
81 rotating shaft
82 rotating crank
83 connecting plate
84 coupling
85 fixed pin
86 adjusting crank
87 adjusting connecting rod
91 detection inductor
92 pressure bar
93 sensed element
94 pressure foot
95 pressure bar sleeve
96 connecting seat
97 pressure spring
98 pressure regulating nut
110 casing
120-seam material
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 for convenience of description only and are not intended to limit the scope of the present invention, and changes or modifications of the relative relationship thereof may be made without substantial technical changes and modifications.
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. 3, 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 towards the head of the sewing machine is a left direction (i.e. the left side of the paper surface in the view of fig. 3), and the direction of the main shaft 10 towards the tail of the sewing machine is a right direction (i.e. the right side of the paper surface in the view of fig. 3); the moving direction of the sewing material when the sewing machine is used for sewing is defined as a front direction.
The application relates to a sewing machine, in which an intelligent feed lifting tooth height adjusting mechanism is installed. As shown in fig. 3, the feed lifting teeth height intelligent adjusting mechanism comprises a main shaft 10 extending left and right, a feed lifting teeth shaft 20 parallel to the main shaft 10, a tooth frame 30, a feed feeding tooth 40 mounted on the tooth frame 30, a first feed lifting teeth transmission assembly 50 connected between the main shaft 10 and the feed lifting teeth shaft 20, a second feed lifting teeth transmission assembly 60 connected between the feed lifting teeth shaft 20 and the tooth frame 30, a feed lifting teeth height adjusting drive source 70, and a feed lifting teeth height adjusting assembly 80, wherein the feed lifting teeth height adjusting drive source 70 is connected with a transmission part in the first feed lifting teeth transmission assembly 50 through the feed lifting teeth height adjusting assembly 80. When the sewing machine stops and the feed lifting tooth height adjusting drive source 70 acts, the feed lifting tooth height adjusting drive source 70 acts on a transmission part in the first feed lifting tooth transmission assembly 50 through the feed lifting tooth height adjusting assembly 80, so that the swinging amplitude of the spindle 10 which drives the feed lifting tooth shaft 20 to swing through the first feed lifting tooth transmission assembly 50 is changed, the amplitude of the feed lifting tooth shaft 20 which drives the tooth frame 30 and the feed feeding tooth 40 to reciprocate up and down through the second feed lifting tooth transmission assembly 60 is changed, and the adjustment of the feed lifting tooth height is realized. Meanwhile, after the feed lifting tooth height adjusting driving source 70 acts on the transmission component in the first feed lifting tooth transmission component 50 through the feed lifting tooth height adjusting component 80, the transmission component can also drive the feed lifting tooth shaft 20 to rotate, so that when the sewing machine stops, the presser foot is lifted upwards and the needle moves up to the highest point, the feed lifting tooth height adjusting driving source 70 rotates by an angle, the feed lifting tooth shaft 20 rotates by an angle through the feed lifting tooth height adjusting component 80 and the transmission component, the feed lifting tooth shaft 20 drives the tooth frame 30 and the feed teeth 40 to move downwards through the second feed lifting tooth transmission component 60, the feed teeth 40 move downwards to the position below the upper surface of the needle plate, and at the moment, the feed teeth 40 cannot interfere with the sewing material and are placed between the presser foot and the needle plate, and the feeding is realized. Therefore, the height of the feeding tooth 40 can be automatically adjusted, and the feeding tooth 40 can be automatically lowered below the needle plate when the machine needle moves upwards to the highest point for discharging, so that the sewing quality is favorably improved.
Further, preferred embodiments of the first tooth lift transmission assembly 50, the tooth lift height adjustment assembly 80, and the second tooth lift transmission assembly 60 are described below in this application.
First embodiment of the first feed dog transmission assembly 50 and the feed dog height adjustment assembly 80
As shown in fig. 3, 5 to 7, the first lift teeth transmission assembly 50 includes a lift teeth eccentric wheel 51 fixedly locked to the main shaft 10 by a screw, a lift teeth connecting rod 52, a first sliding block 53, and a first lift teeth swinging fork 54 fixedly locked to the lift teeth shaft 20 by a screw, an upper end of the lift teeth connecting rod 52 is rotatably sleeved on an outer periphery of the lift teeth eccentric wheel 51, a lower end of the lift teeth connecting rod 52 is hinged to the first sliding block 53 by a first connecting pin 55 extending left and right, a first sliding slot 541 is formed in the first lift teeth swinging fork 54, and the first sliding block 53 is located in the first sliding slot 541 and is in sliding fit with the first sliding slot 541. Preferably, the first sliding block 53 is in surface contact with the groove wall of the first sliding groove 541.
As shown in fig. 3, 5 to 7, the feed-dog height adjusting drive source 70 is connected to the first slider 53 of the first feed-dog transmission unit 50 via the feed-dog height adjusting unit 80, so that the first slider 53 constitutes a transmission member of the first feed-dog transmission unit 50; when the feed dog height adjusting drive source 70 is operated, the position of the first slide block 53 in the first slide groove 541 in the extending direction of the first slide groove 541 is changed, that is, the distance between the hinge point of the feed dog link 52 and the first slide block 53 and the central axis of the feed dog shaft 20 is changed, and simultaneously, the first feed dog swing fork 54 is driven to rotate through an angle by the first slide block 53, so that the feed dog shaft 20 is driven to rotate through a corresponding angle. Based on this, the feed-dog height adjusting assembly 80 comprises a rotating shaft 81 driven by the feed-dog height adjusting driving source 70 to rotate, a rotating crank 82 fixedly locked on the rotating shaft 81 by a screw, and a connecting plate 83, wherein the rotating shaft 81 is parallel to the feed-dog shaft 20 and rotatably installed in the bottom plate of the sewing machine, one end of the connecting plate 83 is hinged with the rotating crank 82 through a fixing pin 85 extending left and right, the connecting plate 83 is hinged on the fixing pin 85, the fixing pin 85 is fixed on the rotating crank 82, and the other end of the connecting plate 83, the feed-dog connecting rod 52 and the first slide block 53 are coaxially hinged through the first connecting pin 55. In this embodiment, as shown in fig. 3 and 13, the feed lifting height adjusting driving source 70 is a motor and is fixedly mounted on the housing 110 of the sewing machine, and an output shaft of the motor is connected to the rotating shaft 81 through the coupling 84; of course, in other embodiments, the output shaft of the motor may be connected to the rotating shaft 81 through a gear transmission mechanism or a synchronous belt transmission mechanism and drive the rotating shaft 81 to rotate. The motor can be a stepping motor or a servo motor, and the rotation angle of the motor can be accurately controlled through the electric controller, so that the accurate adjustment of the tooth lifting height is realized.
Second embodiment of the first feed dog transmission assembly 50 and the feed dog height adjustment assembly 80
As shown in fig. 8 to 10, the first lifting tooth transmission assembly 50 includes a lifting tooth eccentric wheel 51 fixedly locked to the main shaft 10 by screws, a lifting tooth connecting rod 52, a first lifting tooth swinging plate 56, a second lifting tooth swinging plate 57, a lifting tooth swinging seat 58 with a fixed swinging fulcrum, and a lifting tooth crank 59 fixedly locked to the lifting tooth shaft 20 by screws, an upper end of the lifting tooth connecting rod 52 is rotatably fitted around an outer periphery of the lifting tooth eccentric wheel 51, a lower end of the lifting tooth connecting rod 52, a front end of the first lifting tooth swinging plate 56, and a front end of the second lifting tooth swinging plate 57 are coaxially hinged by a left-right extending connecting pin, a rear end of the first lifting tooth swinging plate 56 is hinged to the lifting tooth swinging seat 58 by a left-right extending connecting pin, and a rear end of the second lifting tooth swinging plate 57 is hinged to the lifting tooth crank 59 by a left-right extending connecting pin. Preferably, the left and right sides of the lift tab swing base 58 are rotatably mounted to support pins 510 extending left and right, respectively, the support pins 510 are fixed to the housing 110 of the sewing machine, and the support pins 510 constitute a fixed swing fulcrum of the lift tab swing base 58, that is, the lift tab swing base 58 is rotatable about the support pins 510.
As shown in fig. 8 to 10, the lift tooth height adjustment drive source 70 is connected to the lift tooth swing base 58 of the first lift tooth transmission assembly 50 via the lift tooth height adjustment assembly 80, so that the lift tooth swing base 58 constitutes a transmission member of the first lift tooth transmission assembly 50; when the feed lifting height adjusting driving source 70 is operated, the feed lifting height adjusting assembly 80 drives the feed lifting swing base 58 to rotate around the supporting pin 510, so that the position angle of the feed lifting swing base 58 is changed, the transmission efficiency between the main shaft 10 and the feed lifting shaft 20 is changed, and the feed lifting shaft 20 can be driven to rotate through a corresponding angle. Based on this, the lifting tooth height adjusting assembly 80 comprises an adjusting crank 86 and an adjusting connecting rod 87, the adjusting crank 86 is driven by the lifting tooth height adjusting driving source 70 to rotate, and the upper end of the adjusting connecting rod 87 is hinged with the adjusting crank 86 and the lower lifting tooth swinging seat 58 of the adjusting connecting rod 87 through shaft position screws extending from left to right. In this embodiment, the feed lifting height adjusting driving source 70 is a motor and is fixedly mounted on the housing 110 of the sewing machine, and the adjusting crank 86 is directly fixed and locked on the output shaft of the motor by screws. The motor can be a stepping motor or a servo motor, and the rotation angle of the motor can be accurately controlled through the electric controller, so that the accurate adjustment of the tooth lifting height is realized.
As shown in fig. 3 and 4, the second tooth lifting transmission assembly 60 includes a second slide block 61 and a second tooth lifting swing fork 62 fixed on the tooth lifting shaft 20, the second slide block 61 is hinged to the tooth rack 30 through a second connecting pin 63 extending left and right, a second slide slot 621 is opened in the second tooth lifting swing fork 62, and the second slide block 61 is located in the second slide slot 621 and is in sliding fit with the second slide slot 621. Preferably, the second sliding block 61 is in surface contact with the groove wall of the second sliding groove 621.
Further, the sewing machine is also provided with an operation panel, an electric control module and a presser foot height detection unit for detecting the height of the presser foot. As shown in fig. 11, the presser foot height detection unit includes a detection sensor 91 fixed to the housing 110 and a sensed element 93 fixed to the pressing rod 92, the detection sensor 91 is engaged with the sensed element 93, and the detection sensor 91, the operation panel, and the feed lifting height adjustment driving source 70 are connected to the electronic control module. Preferably, as shown in fig. 11, a presser foot 94 in the sewing machine is mounted at the lower end of the pressing rod 92, and the pressing rod 92 is driven by a presser foot lifting mechanism in the sewing machine to move up and down; the pressure lever 92 can be vertically moved and is arranged in a pressure lever sleeve 95 in a penetrating way, and the pressure lever sleeve 95 is fixed in the shell 110; a connecting seat 96 is fixed above the pressure lever 92, and the sensed element 93 is fixedly arranged on the connecting seat 96, so that the sensed element 93 moves up and down along with the pressure lever 92; the top of the pressure lever 92 is sequentially provided with a pressure spring 97 and a pressure regulating nut 98 from bottom to top, two ends of the pressure spring 97 are abutted against the pressure regulating nut 98 and the pressure lever 92, and the pressure regulating nut 98 is in threaded fit with the shell 110. In this embodiment, the detection sensor 91 is a hall sensor, and the sensed element 93 is a magnet. The sensed element 93 moves up and down together with the pressing rod 92, and the detection sensor 91 monitors the height change of the sensed element 93 in real time, so that the height change of the presser foot 94 is monitored in real time.
The sewing machine of the first embodiment of the lifting tooth height intelligent adjusting mechanism with the structure has the following working principle:
when the sewing machine normally works, the feed lifting teeth height adjusting driving source 70 keeps an angle, the feed lifting teeth height adjusting driving source 70 keeps the rotating crank 82 at a fixed position through the rotating shaft 81, the rotating crank 82 keeps the position of the first slide block 53 in the first sliding groove 541 unchanged through the connecting plate 83, and therefore the distance between the hinge point of the feed lifting teeth connecting rod 52 and the first slide block 53 and the central axis of the feed lifting teeth shaft 20 is kept unchanged. The main shaft 10 drives the cam 51 to rotate together, the first cam swinging fork 54 is driven to swing back and forth through the cam connecting rod 52 and the first sliding block 53, the first cam swinging fork 54, the cam shaft 20 and the second cam swinging fork 62 swing back and forth together, and the tooth frame 30 and the feeding tooth 40 are driven to move back and forth up and down through the second sliding block 61. Since the distance between the hinge point of the feed lifting tooth connecting rod 52 and the first sliding block 53 and the central axis of the feed lifting tooth shaft 20 is kept constant, the swinging amplitude of the main shaft 10 for driving the feed lifting tooth shaft 20 to swing back and forth through the first feed lifting tooth transmission assembly 50 is also kept constant, so that the moving amplitude of the feed lifting tooth shaft 20 for driving the tooth frame 30 and the feed lifting tooth 40 to move back and forth up and down through the second feed lifting tooth transmission assembly 60 is also kept constant, and the height of the feed lifting tooth 40 is also kept constant.
When the height of the lifting tooth is adjusted, a user inputs a desired lifting tooth height parameter or mode through the operation panel, the electric control module controls the action of the lifting tooth height adjusting drive source 70 according to the lifting tooth height input by the user, the output shaft of the motor forming the lifting tooth height adjusting drive source 70 rotates by a certain angle, as shown in fig. 5 to 7, one end of the rotating crank 82 is driven by the rotating shaft 81 to rotate by the same angle, the rotating crank 82 changes in angle, the connecting plate 83 acts on the first sliding block 53, so that the position of the first sliding block 53 in the first sliding groove 541 changes, the first lifting tooth swinging fork 54 also rotates by an angle, the lifting tooth shaft 20 rotates by a corresponding angle along with the first lifting tooth swinging fork 54, and the change in position of the first sliding block 53 in the first sliding groove 541 directly results in the change in the distance between the hinging point of the lifting tooth connecting rod 52 and the first sliding block 53 and the central axis of the lifting tooth shaft 20, namely, the effective length of the first lifting tooth swinging fork 54 is changed, so that the transmission efficiency of the composite crank-link slider mechanism consisting of the lifting tooth connecting rod 52, the first slider 53 and the first lifting tooth swinging fork 54 is changed, namely, the swinging amplitude of the main shaft 10 which drives the lifting tooth shaft 20 to swing through the first lifting tooth transmission component 50 is changed, and further the amplitude of the lifting tooth shaft 20 which drives the tooth frame 30 and the feeding tooth 40 to reciprocate up and down through the second lifting tooth transmission component 60 is changed, and the automatic adjustment of the lifting tooth height is realized.
Further, when the swing amplitude of the feed lifting tooth shaft 20 is increased, the swing amplitude of the second feed lifting tooth swing fork 62 is correspondingly increased, so that the motion amplitude of the vertical reciprocating motion of the tooth frame 30 and the feed feeding tooth 40 is also increased; at this time, as shown in fig. 12, the movement locus of the feed dog 40 changes from the curve S1 to the curve S2, and the feed dog height becomes high, which belongs to the high feed dog height mode. Conversely, when the swing amplitude of the feed lifting tooth shaft 20 is smaller, the swing amplitude of the second feed lifting tooth swing fork 62 is correspondingly smaller, so that the motion amplitude of the vertical reciprocating motion of the tooth frame 30 and the feed feeding tooth 40 is also smaller; at this time, as shown in fig. 12, the movement locus of the feed dog 40 changes from the curve S1 to the curve S3, and the feed dog height becomes low, which belongs to the low feed dog height mode. The angle of the position of the crank handle 82 thus determines the change in height of the feed dog 40. As can be seen from fig. 12, in the present application, when the feed dog 40 is adjusted in the feed dog height, the stitch length of the sewing machine is kept constant, and thus the sewing quality is not affected. The Z direction in fig. 12 indicates the feed dog height of the feed dog 40, and the X direction in fig. 12 indicates the needle pitch.
When the sewing material is moved away after the sewing is finished or the sewing material is put in during the sewing, the needle moves up to the highest point, the presser foot 94 is manually or automatically lifted, the height change of the presser foot 94 during the lifting is monitored by the detection sensor 91 in the presser foot height detection unit in real time, and the value is fed back to the electric control module; the electronic control module judges whether the lifting height of the presser foot 94 reaches a preset value, if so, the electronic control module sends an instruction to the feed lifting tooth height adjusting drive source 70, the feed lifting tooth height adjusting drive source 70 rotates by a preset angle, the feed lifting tooth height adjusting drive source 70 drives the feed rack 30 and the feed feeding teeth 40 to move downwards through the feed lifting tooth height adjusting assembly 80, the first slide block 53 and the first feed lifting tooth swinging fork 54 to enable the feed lifting tooth shaft 20 to rotate by an angle, the feed lifting tooth shaft 20 drives the feed rack 30 and the feed feeding teeth 40 to move downwards through the second feed lifting tooth swinging fork 62 and the second slide block 61, so that the feed feeding teeth 40 cannot protrude upwards from tooth spaces of the needle plate, at the moment, the sewing material can be conveniently moved away or placed between the presser foot 94 and the needle plate, and the feed feeding teeth 40 cannot affect the movement away and placement of the sewing material, and the downward feeding and feeding of the sewing material can be realized. Then, when the presser foot 94 is put down manually or automatically, the electronic control module controls the feed lifting teeth height adjusting driving source 70 to turn over by a corresponding preset angle according to the feedback of the detection sensor 91, so that all the components in the feed lifting teeth height adjusting assembly 80 are reset, the first sliding block 53, the first feed lifting teeth swinging fork 54, the feed lifting teeth shaft 20, the second feed lifting teeth swinging fork 62, the second sliding block 61, the tooth frame 30 and the feed feeding teeth 40 are reset, and the feed feeding teeth 40 rise to the highest point again and emerge upwards from the tooth grooves of the needle plate.
The working principle of the sewing machine of the second embodiment of the lifting tooth height intelligent adjusting mechanism with the structure is as follows:
when the sewing machine normally works, the feed lifting height adjusting driving source 70 keeps an angle, and the feed lifting height adjusting driving source 70 keeps the feed lifting swing seat 58 at a fixed position through the adjusting crank 86 and the adjusting connecting rod 87. The main shaft 10 drives the feed dog eccentric wheel 51 to rotate together, the feed dog crank 59 is driven to swing through the feed dog connecting rod 52, the first feed dog swinging plate 56 and the second feed dog swinging plate 57, the feed dog crank 59, the feed dog shaft 20 and the second feed dog swinging fork 62 swing together in a reciprocating mode, and the feed dog frame 30 and the feed dog 40 are driven to reciprocate up and down through the second slide block 61. Since the position angle of the feed lifting tooth swinging seat 58 is kept unchanged, the swinging amplitude of the main shaft 10 for driving the feed lifting tooth shaft 20 to swing back and forth through the first feed lifting tooth transmission assembly 50 is also kept unchanged, so that the moving amplitude of the feed lifting tooth shaft 20 for driving the tooth frame 30 and the feed lifting tooth 40 to reciprocate up and down through the second feed lifting tooth transmission assembly 60 is also kept unchanged, and the height of the feed lifting tooth 40 is also kept unchanged.
When the height of the lifting tooth is adjusted, a user inputs a desired lifting tooth height parameter or mode through the operation panel, the electric control module controls the action of the lifting tooth height adjusting drive source 70 according to the lifting tooth height input by the user, an output shaft of a motor forming the lifting tooth height adjusting drive source 70 rotates by a certain angle, as shown in fig. 8 to 10, the motor drives the adjusting crank 86 to synchronously rotate, the lifting tooth swinging seat 58 is driven to rotate around the supporting pin 510 through the adjusting connecting rod 87, the position angle of the lifting tooth swinging seat 58 is changed, the change of the position angle of the lifting tooth swinging seat 58 directly leads to the change of the transmission efficiency of the first lifting tooth transmission assembly 50, and further the amplitude of the lifting tooth shaft 20 driving the tooth frame 30 and the feeding tooth 40 to reciprocate up and down through the second lifting tooth transmission assembly 60 is changed, and the automatic adjustment of the lifting tooth height is realized.
Further, when the swing amplitude of the feed lifting tooth shaft 20 is increased, the swing amplitude of the second feed lifting tooth swing fork 62 is correspondingly increased, so that the motion amplitude of the vertical reciprocating motion of the tooth frame 30 and the feed feeding tooth 40 is also increased; at this time, as shown in fig. 12, the movement locus of the feed dog 40 changes from the curve S1 to the curve S2, and the feed dog height becomes high, which belongs to the high feed dog height mode. Conversely, when the swing amplitude of the feed lifting tooth shaft 20 is smaller, the swing amplitude of the second feed lifting tooth swing fork 62 is correspondingly smaller, so that the motion amplitude of the vertical reciprocating motion of the tooth frame 30 and the feed feeding tooth 40 is also smaller; at this time, as shown in fig. 12, the movement locus of the feed dog 40 changes from the curve S1 to the curve S3, and the feed dog height becomes low, which belongs to the low feed dog height mode. Therefore, the position angle of the swing seat 58 of the lifting tooth determines the height change of the feeding tooth 40. As can be seen from fig. 12, in the present application, when the feed dog 40 is adjusted in the feed dog height, the stitch length of the sewing machine is kept constant, and thus the sewing quality is not affected. The Z direction in fig. 12 indicates the feed dog height of the feed dog 40, and the X direction in fig. 12 indicates the needle pitch.
When the sewing material is moved away after the sewing is finished or the sewing material is put in during the sewing, the needle moves up to the highest point, the presser foot 94 is manually or automatically lifted, the height change of the presser foot 94 during the lifting is monitored by the detection sensor 91 in the presser foot height detection unit in real time, and the value is fed back to the electric control module; the electronic control module judges whether the lifting height of the presser foot 94 reaches a preset value, if so, the electronic control module sends an instruction to the feed lifting tooth height adjusting driving source 70, the feed lifting tooth height adjusting driving source 70 rotates by a preset angle, the feed lifting tooth height adjusting driving source 70 enables the feed lifting tooth shaft 20 to rotate by an angle through the feed lifting tooth height adjusting assembly 80, the feed lifting tooth swinging seat 58 and the feed lifting tooth crank 59, the feed lifting tooth shaft 20 drives the tooth rack 30 and the feed feeding tooth 40 to move downwards through the second feed lifting tooth swinging fork 62 and the second sliding block 61, and the feed feeding tooth 40 moves downwards to be below the upper surface of the needle plate, so that the feed feeding tooth 40 cannot protrude upwards from the tooth space of the needle plate, and at the moment, the sewing material can be conveniently moved away or placed between the presser foot 94 and the needle plate, and the feed feeding tooth 40 cannot affect the removal and the feeding of the sewing material, and the feeding under feeding are realized. Then, when the presser foot 94 is put down manually or automatically, the electronic control module controls the feed lifting tooth height adjusting driving source 70 to turn over by a corresponding preset angle according to the feedback of the detection sensor 91, so that all components in the feed lifting tooth height adjusting assembly 80 are reset, the feed lifting tooth swinging seat 58, the feed lifting tooth crank 59, the feed lifting tooth shaft 20, the second feed lifting tooth swinging fork 62, the second sliding block 61, the tooth frame 30 and the feed feeding tooth 40 are reset, and the feed feeding tooth 40 rises to the highest point again and protrudes upwards from the tooth groove of the needle plate.
Further, when the sewing machine cuts thread, in the two embodiments, the electronic control module sends an instruction to the feed lifting teeth height adjusting drive source 70 to control the feed lifting teeth height adjusting drive source 70 to rotate by another preset angle large enough to enable the movement height of the feed feeding teeth 40 to be reduced enough and the movement height of the feed feeding teeth 40 to be close to zero, that is, when the main motor rotates, the feed feeding teeth 40 cannot move to the upper surface of the needle plate in any sewing period, and at the moment, the thread cutting can reduce the length of thread ends remained on the sewing material, so that the thread cutting effect of short thread ends is realized. The specific analysis is as follows: in the existing flat sewing machine, when a section of sewing is to be finished, the sewing needs to be cut off, the movable knife and the fixed knife are meshed with each other to cut off the sewing, but because a specific requirement is met during the thread cutting, the feeding tooth 40 is almost at the highest point during the thread cutting, and the length of the thread head remained on the sewing material 120 after the thread cutting is related to the distance from the thread cutting position to the sewing material 120, wherein the thread cutting knife (i.e. the movable knife and the fixed knife) is positioned below the needle plate, and the sewing material 120 is positioned above the feeding tooth 40, as shown in fig. 14, the length of the thread head after the thread cutting is considered to be equal to the sum of the distance d1 from the lower side of the needle plate by the thread cutting knife, the thickness d2 of the needle plate and the height d3 of the feeding tooth 40, so that the length L of the thread head remained on the sewing material 120 after the thread cutting is. In the sewing machine of the present application, when cutting a thread, the feed dog 40 can be moved to a height close to zero by the feed dog height adjusting drive source 70 and the feed dog height adjusting assembly 80, so that the feed dog 40 does not move above the upper surface of the needle plate in any sewing period, as shown in fig. 15, that is, the height d3 of the feed dog 40 is 0 when cutting a thread, so that the length L of the thread end remaining on the sewing material 120 after cutting a thread is d1+ d2, so that the sewing material 120 is closer to the engagement opening of the thread cutter, thereby achieving the thread cutting effect of the short thread end.
In conclusion, the sewing machine related to the application realizes the effect that the tooth lifting height of the feeding tooth 40 can be freely adjusted within a certain range, the feeding tooth 40 can automatically descend to the lower feeding material taking/feeding material below the upper surface of the needle plate when the presser foot 94 lifts the material taking/feeding, and the thread trimming effect of the short thread end, so that the adaptability of the sewing machine to different sewing materials is greatly improved, the sewing quality of the sewing machine is greatly improved, and the product competitiveness of the sewing machine is improved. Particularly, the corresponding relation between the sewing material thickness and the feed tooth height of the feed tooth 40 can be set in the electronic control module, parametric mode input of the feed tooth height of the feed tooth 40 is achieved, the automatic switching function of the feed tooth height of the feed tooth 40 is achieved, and the intelligent level of the sewing machine is greatly improved. 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 (12)
1. The utility model provides a feed lifting tooth height intelligent regulation mechanism, includes main shaft (10), is on a parallel with feed lifting tooth axle (20) of main shaft (10), dental articulator (30), installs pay-off tooth (40) on dental articulator (30), connects first feed lifting tooth transmission assembly (50) between main shaft (10) and feed lifting tooth axle (20), and connects second feed lifting tooth transmission assembly (60) between feed lifting tooth axle (20) and dental articulator (30), its characterized in that: the lifting tooth height adjusting mechanism further comprises a lifting tooth height adjusting driving source (70) and a lifting tooth height adjusting assembly (80), wherein the lifting tooth height adjusting driving source (70) is connected with a transmission part in the first lifting tooth transmission assembly (50) through the lifting tooth height adjusting assembly (80); when the feed lifting height adjusting driving source (70) acts, the transmission component drives the feed lifting shaft (20) to rotate, and the swing amplitude of the main shaft (10) which drives the feed lifting shaft (20) to swing through the first feed lifting transmission component (50) is changed.
2. The intelligent lifting tooth height adjusting mechanism according to claim 1, characterized in that: the first lifting tooth transmission assembly (50) comprises a lifting tooth eccentric wheel (51) fixed on the main shaft (10), a lifting tooth connecting rod (52), a first sliding block (53) and a first lifting tooth swinging fork (54) fixed on the lifting tooth shaft (20), one end of the lifting tooth connecting rod (52) is rotatably sleeved on the periphery of the lifting tooth eccentric wheel (51), the other end of the lifting tooth connecting rod (52) is hinged with the first sliding block (53), a first sliding groove (541) is formed in the first lifting tooth swinging fork (54), the first sliding block (53) is located in the first sliding groove (541), and the first sliding block (53) and the first sliding groove (541) are in sliding fit.
3. The intelligent lifting tooth height adjusting mechanism according to claim 2, characterized in that: the lifting tooth height adjusting driving source (70) is connected with the first sliding block (53) through a lifting tooth height adjusting assembly (80); when the lifting tooth height adjusting driving source (70) acts, the position of the first sliding block (53) in the first sliding groove (541) in the extending direction of the first sliding groove (541) is changed.
4. The lifting tooth height intelligent regulating mechanism according to claim 2 or 3, characterized in that: the feed lifting mechanism is characterized in that the feed lifting height adjusting assembly (80) comprises a rotating shaft (81) driven to rotate by a feed lifting height adjusting driving source (70), a rotating crank (82) fixed on the rotating shaft (81), and a connecting plate (83), wherein one end of the connecting plate (83) is hinged to the rotating crank (82), and the other end of the connecting plate (83) is coaxially hinged to the feed lifting connecting rod (52) and the first sliding block (53).
5. The intelligent lifting tooth height adjusting mechanism according to claim 4, characterized in that: the lifting tooth height adjusting driving source (70) is a motor, and an output shaft of the motor is connected with the rotating shaft (81) through a coupler (84).
6. The intelligent lifting tooth height adjusting mechanism according to claim 1, characterized in that: the first lifting tooth transmission assembly (50) comprises a lifting tooth eccentric wheel (51) fixed on the main shaft (10), a lifting tooth connecting rod (52), a first lifting tooth swinging plate (56), a second lifting tooth swinging plate (57), a lifting tooth swinging seat (58) with a fixed swinging fulcrum and a lifting tooth crank (59) fixed on the lifting tooth shaft (20), one end of the lifting tooth connecting rod (52) is rotatably sleeved on the periphery of the lifting tooth eccentric wheel (51), the other end of the lifting tooth connecting rod (52), one end of the first lifting tooth swinging plate (56) and one end of the second lifting tooth swinging plate (57) are coaxially hinged, the other end of the first lifting tooth swinging plate (56) is hinged with the lifting tooth swinging seat (58), and the other end of the second lifting tooth swinging plate (57) is hinged with the lifting tooth crank (59).
7. The intelligent lifting tooth height adjusting mechanism according to claim 6, characterized in that: the lifting tooth height adjusting driving source (70) is connected with the lifting tooth swinging seat (58) through a lifting tooth height adjusting assembly (80); when the feed lifting teeth height adjusting driving source (70) acts, the position angle of the feed lifting teeth swinging seat (58) is changed.
8. The lifting tooth height intelligent regulating mechanism according to claim 6 or 7, characterized in that: the lifting tooth height adjusting assembly (80) comprises an adjusting crank (86) and an adjusting connecting rod (87), wherein the adjusting crank (86) is driven by a lifting tooth height adjusting driving source (70) to rotate, and two ends of the adjusting connecting rod (87) are respectively hinged with the adjusting crank (86) and the lifting tooth swinging seat (58).
9. The intelligent lifting tooth height adjusting mechanism according to claim 7, characterized in that: the lifting tooth height adjusting driving source (70) is a motor, and the adjusting crank (86) is fixed on an output shaft of the motor.
10. The intelligent lifting tooth height adjusting mechanism according to claim 1, characterized in that: the second tooth lifting transmission assembly (60) comprises a second sliding block (61) and a second tooth lifting swing fork (62) fixed on the tooth lifting shaft (20), the second sliding block (61) is hinged with the tooth frame (30), a second sliding groove (621) is formed in the second tooth lifting swing fork (62), and the second sliding block (61) is located in the second sliding groove (621) and is in sliding fit with the second sliding groove (621).
11. A sewing machine characterized by: the sewing machine is provided with the lifting tooth height intelligent adjusting mechanism of any one of claims 1-10.
12. The sewing machine of claim 11, wherein: the device is characterized by further comprising an electric control module and a presser foot height detection unit for detecting the height of the presser foot, wherein the presser foot height detection unit comprises a detection sensor (91) fixed with the shell (110) and a sensed element (93) fixed with the pressing rod (92), the detection sensor (91) is matched with the sensed element (93), and the detection sensor (91) and the lifting tooth height adjusting driving source (70) are connected with the electric control module.
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| CN201910905855.1A CN112626729A (en) | 2019-09-24 | 2019-09-24 | Feed lifting tooth height intelligent adjusting mechanism and sewing machine |
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| CN115198454A (en) * | 2021-04-09 | 2022-10-18 | 杰克科技股份有限公司 | Sewing machine |
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Address after: 318010 No. 1008, east section of Donghai Avenue, Sanjia, Jiaojiang District, Taizhou City, Zhejiang Province Applicant after: Jack Technology Co.,Ltd. Address before: 318010 No. 15 Airport South Road, Jiaojiang District, Zhejiang, Taizhou Applicant before: JACK SEWING MACHINE Co.,Ltd. |
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Application publication date: 20210409 |