CN106436072B - Thread cutting mechanism of sewing machine - Google Patents
Thread cutting mechanism of sewing machine Download PDFInfo
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- CN106436072B CN106436072B CN201611075255.XA CN201611075255A CN106436072B CN 106436072 B CN106436072 B CN 106436072B CN 201611075255 A CN201611075255 A CN 201611075255A CN 106436072 B CN106436072 B CN 106436072B
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B65/00—Devices for severing the needle or lower thread
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/66—Disintegrating fibre-containing textile articles to obtain fibres for re-use
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Abstract
The invention provides a thread cutting mechanism of a sewing machine, and belongs to the technical field of machinery. The thread cutting mechanism solves the problems of complex structure and high production cost of the existing thread cutting mechanism of the sewing machine. The needle plate is parallel to the upper cutter and the lower cutter, the cutting edge is arranged on the upper side of the front end of the lower cutter, the cutting part is arranged on the lower side of the front end of the upper cutter, the driving part I which can drive the lower cutter to move back and forth relative to the upper cutter is arranged on a workbench of the sewing machine, the lower cutter is provided with a hooking groove and the front end of the lower cutter is in a barb shape, a penetrating wire inlet hole is arranged on the lower cutter from top to bottom, the wire inlet hole is positioned between the hooking groove and the cutting edge, the front end of the upper cutter is connected with an elastic wire clamping piece, and the wire clamping piece is positioned outside the front end of the lower cutter. The needle thread cutting device has the advantages that the needle thread can be clamped and cut by two cutters when the sewing starts, so that the bird nest phenomenon is eliminated, the needle thread and the bottom thread can be cut together when the sewing ends, the integral structure of the sewing machine is simplified, and the like.
Description
Technical Field
The invention belongs to the technical field of machinery, and relates to a sewing machine, in particular to a thread cutting mechanism of the sewing machine.
Background
An upper thread of the existing sewing machine penetrates into a needle hole of a needle, and a bottom thread is wound on a shuttle core in a rotating shuttle. When sewing, the upper thread and the bottom thread are interwoven to form a thread loop so as to form a required stitch. The existing industrial sewing machine is generally provided with a special automatic thread cutting mechanism, and the bottom thread and the surface thread need to be cut together after the sewing is finished. Because one side of the needle hole of the machine needle is required to be provided with a section of upper thread, a larger bird nest phenomenon can be formed on the reverse side of the sewing material. Along with the continuous development of the technology level, the degree of automation of the sewing machine is higher and higher, a special automatic thread cutting mechanism is generally configured on the existing industrial sewing machine and is divided into a thread cutting mechanism and a thread cutting mechanism, the thread cutting mechanism is specially used for cutting threads, the thread cutting mechanism is specially used for cutting bottom threads, the automatic thread cutting mechanism adopting the mode can lead to quite complex overall structure of the sewing machine, high production cost and low practicality.
To solve this problem, chinese patent discloses a thread cutting device for sewing machine [ application number: 02120318.0 it includes disposing under the needle plate, carry on the 1 st cutter of the reciprocating motion of the needle falling position of the crosscut machine under the drive of the pulse motor; a 2 nd cutter which is driven by the pneumatic cylinder and performs reciprocating motion between a standby position at intervals on one side of the needle falling position and a cutting position for cutting the suture line through the cooperation motion of the 1 st cutter when the sewing is finished; forming an initial position at a certain distance from the other side of the needle falling position and a position which moves a certain distance from the initial position along with the movement of the 1 st cutter to the 2 nd cutter side, and cutting off the 3 rd cutter of the suture line through the cooperation action of the first cutter after the sewing is started; and the thread clamping plate is fixed on the 3 rd cutter at the initial position and the position which moves a certain distance, and clamps the thread of the 1 st needle under the sewed object when the sewing starts through the cooperation action of the 3 rd cutter and the 1 st cutter. The thread cutting device of the sewing machine can cut off the thread by utilizing the cooperation of the 1 st cutter and the 3 rd cutter when sewing starts and clamp the thread by utilizing the clamp plate, and can cut off the thread by utilizing the cooperation of the 1 st cutter and the 2 nd cutter after sewing ends.
Although the thread cutting device of the sewing machine has the functions of cutting the thread at the beginning of sewing and cutting the thread after finishing sewing, the thread cutting device has some defects: the 1 st cutter and the 3 rd cutter are used for cutting the suture at the beginning of sewing, the 1 st cutter and the 2 nd cutter are used for cutting the suture after the end of sewing, and the 1 st cutter, the 2 nd cutter and the 3 rd cutter are all required to be provided with special driving devices for independent driving, so that the whole structure of the sewing machine is still complex, and the production cost of the whole sewing machine is still high due to excessive parts.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a thread cutting mechanism of a sewing machine, which aims to solve the technical problems of clamping and cutting an upper thread by two cutters at the beginning of sewing so as to eliminate the nest phenomenon and cutting the upper thread and a lower thread together at the end of sewing so as to simplify the whole structure of the sewing machine.
The aim of the invention can be achieved by the following technical scheme:
the utility model provides a sewing machine cuts line mechanism, includes the last cutter and lower cutter of faller downside that set up on the sewing machine workstation, faller, go up cutter and lower cutter parallel, lower cutter front end upside is equipped with the blade, it has cutting part to go up cutter front end downside, be equipped with on the sewing machine workstation and drive down the cutter for last cutter back-and-forth movement's driving piece one, it makes the front end of lower cutter be barb form to have on the lower cutter to collude the wire casing and collude the wire casing, its characterized in that, be equipped with the entrance hole that runs through and entrance hole from the top down on the lower cutter and be located and collude between wire casing and the blade, the front end of going up the cutter is connected with the clamp that has elasticity, the clamp is located outside the front end of lower cutter, and when cutter moves forward down the cutter front end can upwards extrude clamp and make clamp and the cutting part of last cutter front end press on the upside down.
The thread cutting mechanism of the sewing machine can clamp and cut the upper thread when sewing begins and cut the upper thread and the bottom thread together after sewing ends. When the sewing starts, the lower cutter is controlled by the first driving part to move forward to the position right below a needle hole on the needle plate, so that the upper thread can fall into the needle hole when the needle drives the upper thread to pass through the needle hole, and then the lower cutter is controlled by the first driving part to retract. Because the front end of the lower cutter moves forwards and upwards extrudes the front ends of the thread clamping sheet and the upper cutter and enables the cutting parts of the front ends of the thread clamping sheet and the upper cutter to be pressed on the upper side surface of the lower cutter, the upper side surface of the lower cutter moves along the cutting parts of the thread clamping sheet and the upper cutter when the lower cutter retracts, the upper thread can be clamped on the upper side surface of the lower cutter by the thread clamping sheet, the upper thread is cut off when the cutting edge of the lower cutter retracts to the position where the cutting edge of the upper cutter is staggered with the cutting part of the upper cutter, the cut upper thread is still clamped on the upper side surface of the lower cutter by the thread clamping sheet, and the reverse side of the stitching material has no bird nest phenomenon. After the sewing is finished, the lower cutter is controlled to move forwards by the first driving part, the bottom thread and the surface thread are simultaneously hooked into the hooking groove, the first driving part is used for controlling the lower cutter to retract, and the bottom thread and the surface thread are simultaneously sheared by the cutting part of the upper cutter when the lower cutter retracts until the cutting edge on the lower cutter is staggered with the cutting part of the upper cutter.
The thread cutting mechanism of the sewing machine is characterized in that the thread hooking groove on the lower cutter is provided with the thread inlet hole with the cutting edge, the thread inlet hole is matched with the thread clamping piece connected to the front end of the upper cutter, so that the upper cutter and the lower cutter have the function of cutting off the bottom thread and the upper thread together when the sewing is finished, and simultaneously have the function of clamping and cutting off the upper thread when the sewing is started, thereby greatly simplifying the integral structure of the sewing machine and reducing the production cost of the whole sewing machine.
In the thread cutting mechanism of the sewing machine, the thread clamping piece is connected to the upper side of the front end of the upper cutter, and the front end of the thread clamping piece is provided with a thread clamping part which is bent downwards to the outside of the front end of the upper cutter.
The front end of the thread clamping piece is bent downwards to form a thread clamping part outside the front end of the upper cutter, the thread clamping part has elasticity, the front end of the lower cutter extrudes the thread clamping part of the thread clamping piece upwards to deform the thread clamping part when the lower cutter stretches out, so that the thread clamping part can be pressed on the upper side surface of the lower cutter under the action of self elasticity after the lower cutter stretches out, and then when an upper thread falls into a thread inlet hole of the lower cutter and the lower cutter retracts, the thread clamping part naturally clamps the upper thread on the upper side surface of the lower cutter. Through the design, the thread cutting mechanism of the sewing machine can clamp and cut the upper thread when sewing starts and cut the upper thread and the lower thread together when sewing ends by utilizing the lower cutter and the upper cutter, so that the whole structure of the sewing machine is simplified, and the clamping of the upper thread is ensured to be still realized normally.
In the thread cutting mechanism of the sewing machine, the lower side of the needle plate is provided with the abdication groove, and the thread clamping piece is positioned in the abdication groove.
When the lower cutter stretches out or retracts to enable the upper side face of the front end of the lower cutter to be in contact with the bottom face of the thread clamping part of the thread clamping piece, the upper side face of the front end of the lower cutter can upwards extrude the thread clamping part of the thread clamping piece, and the yielding groove is arranged on the lower side of the needle plate and can provide enough deformation space for the thread clamping part, so that the thread clamping part can be deformed smoothly to clamp the upper side face of the lower cutter.
In the sewing machine thread cutting mechanism, the motor mounting plate is fixed on the sewing machine workbench, the first driving piece comprises a driving motor fixed on the motor mounting plate, an output shaft of the driving motor is perpendicular to the motor mounting plate, a crank and a pull rod are arranged between the output shaft of the driving motor and the lower cutter, one end of the crank is connected with the output shaft of the driving motor, the other end of the crank is hinged with one end of the pull rod, the other end of the pull rod is connected with the rear end of the lower cutter, a first sensor is fixed on the motor mounting plate, a detection plate is connected to the upper side of one end, connected with the output shaft of the driving motor, of the crank, the detection plate is higher than the first sensor, and the lower cutter is driven by the driving motor to move forwards until the detection plate is opposite to the first sensor when the sewing starts.
One end of the crank is connected with the output shaft of the driving motor, then the output shaft of the driving motor rotates to drive the crank to swing, and as the other end of the crank is hinged with one end of the pull rod, the other end of the pull rod is connected with the rear end of the lower cutter, the lower cutter is driven to move back and forth through the pull rod after the crank swings, so that the extension and retraction of the lower cutter are controlled. The first sensor on the motor mounting plate is matched with the upper side connection detection plate connected to one end of the crank connected with the output shaft of the driving motor, so that the lower cutter can accurately move to the position right below a needle hole of the needle plate where the wire inlet is located when sewing starts, thereby ensuring that the upper thread can accurately fall into the wire inlet to be cut, and the upper thread cutting mechanism of the sewing machine can simultaneously cut the upper thread and the lower thread when sewing starts and cut the upper thread and the lower thread when sewing ends by only utilizing the lower cutter and the upper cutter.
In the sewing machine thread cutting mechanism, the positioning plate is fixed on the lower side of the needle plate, positioning grooves formed in the two end faces of the positioning plate are formed in the positioning plate, the upper cutter and the lower cutter are located in the positioning grooves, the spring piece is connected with the lower side of the front end of the positioning plate, the felt is fixed on the spring piece, and the felt is located below the lower cutter and contacts with the lower cutter.
When the bottom thread and the upper thread are cut off together after sewing, the rest bottom thread is still positioned in the hooking groove of the lower cutter, and as the spring piece is connected to the lower side of the front end of the positioning plate, the felt is fixed on the spring piece, positioned below the lower cutter and contacted with the lower cutter, and then the rest bottom thread is stuck on the felt when the lower cutter retracts to the rest bottom thread to contact with the surface of the felt with the rest bottom thread, thereby realizing clamping of the bottom thread. By adopting the structure, the upper cutter and the lower cutter are only utilized to simultaneously realize the functions of cutting the upper thread at the beginning of sewing and cutting the upper thread and the lower thread together after the end of sewing, and simultaneously ensure that the lower thread can be clamped normally after being cut, ensure that the lower thread can be interwoven with the upper thread smoothly when being sewn next time, and avoid the phenomenon of needle skipping.
Compared with the prior art, the thread cutting mechanism of the sewing machine has the advantages that the thread feeding hole is formed in the lower cutter, the thread clamping piece is connected to the front end of the upper cutter, the upper cutter and the lower cutter have the function of cutting the upper thread and the lower thread after sewing, and simultaneously have the function of cutting the upper thread when sewing starts, so that the thread cutting mechanism of the sewing machine only integrates the functions of clamping and cutting the upper thread when sewing starts and simultaneously cutting and clamping the lower thread after sewing ends through the two cutters, the whole structure of the sewing machine can be well simplified, and the production cost of the whole sewing machine can be well reduced. In addition, the thread cutting mechanism of the sewing machine is connected with the thread clamping piece at the front end of the upper cutter, the front end of the thread clamping piece is provided with the thread clamping part which is downwards bent to the outside of the front end of the lower cutter, and the upper side face of the lower cutter is matched with the thread clamping part to clamp the upper thread at the beginning of sewing, so that the thread cutting mechanism of the sewing machine integrates the functions of cutting the upper thread at the beginning of sewing and the functions of cutting the lower thread and the upper thread after finishing sewing into the upper cutter and the lower cutter, and simultaneously has due functions.
Drawings
Fig. 1 is a schematic view of the thread cutting mechanism of the sewing machine when the thread cutting mechanism is arranged on a workbench of the sewing machine.
Fig. 2 is a schematic view of the thread cutting mechanism of the sewing machine.
FIG. 3 is a schematic view of the thread cutting mechanism of the sewing machine at another angle.
Fig. 4 is a partial enlarged view of fig. 3.
Fig. 5 is a partially exploded view of the thread cutting mechanism of the present sewing machine.
Fig. 6 is an exploded view of the upper cutter, the lower cutter and the positioning plate in the thread cutting mechanism of the sewing machine.
Fig. 7 is a schematic view of the structure of the lower cutter in the thread cutting mechanism of the sewing machine.
Fig. 8 is a schematic diagram of the structure of the upper cutter in the thread cutting mechanism of the sewing machine.
Fig. 9 is a bottom view of the thread cutting mechanism of the sewing machine after the cutter is extended at the beginning of sewing.
Fig. 10 is a top view of fig. 9.
Fig. 11 is a bottom view of the thread cutting mechanism of the sewing machine after the lower cutter extends out after sewing.
In the figure, 1, a workbench; 2. a needle plate; 2a, a yielding groove; 3. an upper cutter; 3a, a cutting part; 3a1, a stress surface; 3b, limiting holes; 3c, a connecting part; 4. a lower cutter; 4a, cutting edges; 4b, hooking grooves; 4c, a wire inlet hole; 4d, cutting the surface; 4e, wire clamping surface; 4f, a guide surface; 5. a positioning plate; 5a, positioning grooves; 5b, connecting holes; 5c, limiting gaps; 6. a wire clamping piece; 6a, a wire clamping part; 7. a spring piece; 8. a felt; 9. a motor mounting plate; 10. a driving motor; 11. a crank; 12. a pull rod; 12a, connectors; 13. a fixing plate; 14. a first sensor; 15. a second sensor; 16. a detection plate; 17. a driving motor; 18. a connecting rod; 18a, raised heads.
Detailed Description
The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1, 2, 3 and 5, a thread cutting mechanism of a sewing machine is positioned at the lower side of a needle plate 2 on a workbench 1 of the sewing machine, and comprises an upper cutter 3 and a lower cutter 4 which are arranged at the lower side of the needle plate 2, wherein the lower cutter 4 is positioned below the upper cutter 3 and the upper cutter 3 is abutted against the lower cutter 4, the needle plate 2, the upper cutter 3 and the lower cutter 4 are parallel, a cutting part 3a protruding downwards is arranged at the lower side of the front end of the upper cutter 3, and a cutting edge 4a is arranged at the upper side of the front end of the lower cutter 4. The workbench 1 of the sewing machine is provided with a first driving piece and a second driving piece, the first driving piece is connected with the lower cutter 4, the second driving piece is connected with the upper cutter 3, the lower cutter 4 can be driven by the first driving piece to move forwards or backwards, and the upper cutter 3 can be driven by the second driving piece to move forwards or backwards.
As shown in fig. 6, 7 and 8, the lower cutter 4 is provided with a hooking groove 4b, the hooking groove 4b makes the front end of the lower cutter 4 be in a reversed hook shape, the lower cutter 4 is provided with a penetrating wire inlet hole 4c, and the wire inlet hole 4c is positioned between the cutting edge 4a of the lower cutter 4 and the hooking groove 4 b. The upper side of the front end of the lower cutter 4 is sequentially provided with a cutting surface 4d, a wire clamping surface 4e and a guide surface 4f from back to front, the cutting surface 4d is always inclined upwards from a wire inlet hole 4c to a position on the lower cutter 4, which is closer to the front end of the lower cutter 4 than the cutting edge 4a, the wire clamping surface 4e extends forwards from an inclined surface, the guide surface 4f is inclined downwards from the wire clamping surface 4e, and the bottom of the cutting part 3a of the upper cutter 3 is provided with a stress surface 3a1 with the same inclination direction as the guide surface 4 f.
As shown in fig. 2, 3, 4, 5 and 6, a positioning plate 5 is fixed on the lower side of the needle plate 2, positioning grooves 5a are formed on the positioning plate 5 and are formed at two end faces of the positioning plate 5, and the upper cutter 3 and the lower cutter 4 are located in the positioning grooves 5 a. The upper side of the front end of the upper cutter 3 is connected with a wire clamping piece 6, the front end of the wire clamping piece 6 is provided with a wire clamping part 6a which is bent downwards to the outside of the front end of the upper cutter 3, the lower side of the needle plate 2 is provided with a yielding groove 2a, the wire clamping piece 6 is positioned in the yielding groove 2a, when the lower cutter 4 retracts to enable a cutting surface 4d on the lower cutter 4 to be in contact with the wire clamping part 6a of the wire clamping piece 6, the cutting surface 4d can upwards extrude the wire clamping part 6a of the wire clamping piece 6 in the retracting process of the lower cutter 4, and the setting of the yielding groove 2a can just ensure that the wire clamping part 6a of the wire clamping piece 6 has enough deformation space. The front end downside of locating plate 5 is connected with spring leaf 7, is fixed with felt 8 on the spring leaf 7, and felt 8 is located the below of lower cutter 4 and felt 8 contacts with lower cutter 4.
As shown in fig. 1, 2, 3 and 5, the sewing machine table 1 is provided with a mounting groove corresponding to the positioning plate 5, and the positioning plate 5 is positioned in the mounting groove. The sewing machine workbench 1 is also provided with a motor mounting plate 9 close to the needle plate 2, the first driving part comprises a driving motor 10 fixed on the motor mounting plate 9, an output shaft of the driving motor 10 is perpendicular to the motor mounting plate 9, and a crank 11 is connected to an output shaft of the driving motor 10. One end of the crank 11 is connected with the output shaft of the driving motor 10, the other end of the crank 11 is connected with a pull rod 12, the end of the crank 11 is hinged with one end of the pull rod 12, the other end of the pull rod 12 is positioned in a mounting groove on the sewing machine workbench 1 and positioned below the positioning plate 5, the end of the pull rod 12 is provided with an upward protruding connector 12a, the connector 12a is cylindrical, the bottom wall of the positioning groove 5a on the positioning plate 5 is provided with a connecting hole 5b which penetrates and takes the shape of a strip, the upper cutter 3 is provided with a limiting hole 3b which penetrates and takes the shape of a strip, and the connector 12a penetrates through the connecting hole 5b and the rear end of the lower cutter 4 and is positioned in the limiting hole 3b of the upper cutter 3. The upper cutter 3 is provided with a limiting hole 3b mainly used for limiting the moving stroke of the lower cutter 4 and preventing the lower cutter 4 from moving excessively, in addition, a circular arc-shaped fixing plate 13 is also fixed on the motor mounting plate 9, a first sensor 14 and a second sensor 15 are respectively fixed on two ends of the fixing plate 13, a fan-shaped detection plate 16 is connected to the upper side of one end of the crank 11 connected with the driving motor 10, the height of the detection plate 16 is higher than that of the sensor, when the lower cutter 4 starts to be sewn, the detection plate 16 which is driven by the driving motor 10 to move forward to the crank 11 is opposite to the first sensor 14, and the second sensor 15 is used for controlling the retraction formation of the lower cutter 4, and when the lower cutter 4 is retracted to the detection plate 16 to be opposite to the second sensor 15, the driving motor 10 is controlled to stop working.
As shown in fig. 1, 2, 3 and 5, the second driving member comprises a driving cylinder 17 fixed on the motor mounting plate 9, a piston rod of the driving cylinder 17 is parallel to the motor mounting plate 9, and a connecting rod 18 is connected to an end of the piston rod of the driving cylinder 17. The connecting rod 18 comprises a transverse straight section and a vertical section perpendicular to the transverse straight section, the end part of the piston rod of the driving cylinder 17 is connected with the vertical section of the connecting rod 18, and the transverse straight section of the connecting rod 18 is positioned in the mounting groove of the sewing machine workbench 1 and below the positioning plate 5. The locating plate 5 lateral part has the spacing breach 5c that is linked together with constant head tank 5a, go up the middle part one side of cutter 3 and have the connecting portion 3c of outwards protrusion, connecting portion 3c are located spacing breach 5c, the other end upside that the horizontal straight section of connecting rod 18 is connected with vertical section has and is cylindric protruding head 18a, protruding head 18a is located spacing breach 5c and protruding head 18 a's tip passes the connecting portion 3c of cutter 3, can restrict the travel of going up cutter 3 through setting up spacing breach 5c, avoid going up cutter 3 excessive movement, and lead to unable and carry out normal trimming with lower cutter 4 cooperation.
The thread cutting mechanism of the sewing machine can cut off the upper thread when sewing begins and cut off the upper thread and the lower thread simultaneously when sewing ends. The specific process of shearing the upper thread during the seam opening is as follows: as shown in fig. 9 and 10, when the sewing starts, the upper cutter 3 is kept stationary, the output shaft of the driving motor 10 rotates and drives the crank 11 to swing, the detection piece extending to the crank 11 from the front end of the lower cutter 4 relative to the upper cutter 3 is opposite to the first sensor 14 through the cooperation of the crank 11 and the pull rod 12, and at the moment, the wire inlet hole 4c on the lower cutter 4 is just under the needle hole on the needle plate 2, so that the needle thread can be positioned in the wire inlet hole 4c on the lower cutter 4 when the needle brings the needle thread to the lower side of the needle plate 2 through the needle hole. In the process of extending the lower cutter 4, the front ends of the thread clamping part 6a of the thread clamping sheet 6 and the upper cutter 3 are pressed upwards under the action of the guide surface 4f at the front end of the lower cutter 4, and then the thread clamping part 6a of the thread clamping sheet 6 and the cutting part 3a of the upper cutter 3 are pressed on the upper side surface of the lower cutter 4 under the action of self elasticity. Then, the output shaft of the driving motor 10 rotates reversely to retract the lower cutter 4, and in the retracting process of the lower cutter 4, the upper thread is clamped on the upper side surface of the lower cutter 4 by the thread clamping part 6a because the thread clamping part 6a of the thread clamping piece 6 and the cutting part 3a of the upper cutter 3 are always stuck on the upper side surface of the lower cutter 4, and when the cutting edge 4a of the lower cutter 4 retracted to the lower cutter 4 is staggered with the cutting part 3a of the upper cutter 3, the upper thread is cut off by the lower cutter 4.
The specific process of shearing the upper thread and the lower thread during seam stopping is as follows: as shown in fig. 11, after the sewing is finished, the driving motor 10 controls the lower cutter 4 to move forward through the cooperation of the crank 11 and the connecting rod 18, the piston rod of the driving cylinder 17 extends out and drives the upper cutter 3 to move forward through the connecting rod 18, and the moving distance of the lower cutter 4 is larger than the moving distance of the upper cutter 3. Because the lower cutter 4 is provided with the hooking groove 4b, the upper thread and the lower thread can be hooked into the hooking groove 4b together after the lower cutter 4 moves forwards, then the lower cutter 4 is controlled to retract by the driving motor 10, and when the lower cutter 4 retracts until the cutting edge 4a on the lower cutter 4 passes through the cutting part 3a on the upper cutter 3, the upper thread and the lower thread are cut off together. After the upper thread and the lower thread are cut off, the residual lower thread in the sewing machine workbench 1 is still hooked in the hooking groove 4b on the lower cutter 4, the piston rod of the driving cylinder 17 retracts and drives the upper cutter 3 to retract to the initial position, and the lower cutter 4 retracts to the initial position under the driving of the driving motor 10. Since the front end of the positioning plate 5 is provided with the block-shaped felt 8, when the lower cutter 4 moves to the felt 8, the bottom thread hooked by the hooking groove 4b is stuck on the felt 8. It should be noted here that the upper cutter 3 is also moved forward a certain distance during the cutting of the upper thread and the lower thread mainly in order to be able to cut the thread ends shorter.
The thread cutting mechanism of the sewing machine is characterized in that the thread feeding hole 4c is formed in the lower cutter 4, and the front end of the upper cutter 3 is connected with the thread clamping piece 6, so that the upper cutter 3 and the lower cutter 4 have the function of cutting an upper thread and a lower thread after sewing is finished and simultaneously have the function of clamping and cutting the upper thread at the beginning of sewing, and the thread cutting mechanism of the sewing machine only has the functions of clamping and cutting the upper thread at the beginning of sewing and simultaneously cutting the upper thread and the lower thread at the end of sewing and clamping the lower thread through two cutters.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (5)
1. The utility model provides a sewing machine thread cutting mechanism, includes upper cutter (3) and lower cutter (4) of needle board (2) downside on sewing machine workstation (1), needle board (2), upper cutter (3) and lower cutter (4) are parallel, lower cutter (4) front end upside is equipped with blade (4 a), upper cutter (3) front end downside has cutting part (3 a), be equipped with on sewing machine workstation (1) and can drive lower cutter (4) for last cutter (3) fore-and-aft movement's driving piece one, have on lower cutter (4) and collude wire casing (4 b) and make the front end of lower cutter (4) be the barb form, its characterized in that, be equipped with wire inlet (4 c) and wire inlet (4 c) that run through on lower cutter (4) are located between collude wire casing (4 b) and blade (4 a), the front end of upper cutter (3) is connected with has elastic clip (6), clip (6) are located the front end of outer side of lower clip (4), and when the lower cutter (4) moves forwards, the front ends of the lower cutter (4) can upwards extrude the front ends of the thread clamping sheet (6) and the upper cutter (3) and enable the cutting parts (3 a) at the front ends of the thread clamping sheet (6) and the upper cutter (3) to be pressed on the upper side face of the lower cutter (4).
2. The thread cutting mechanism of sewing machine according to claim 1, wherein the thread clamping piece (6) is connected to the upper side of the front end of the upper cutter (3), and the front end of the thread clamping piece (6) has a thread clamping portion (6 a) bent downward to the outside of the front end of the upper cutter (3).
3. The thread cutting mechanism of the sewing machine according to claim 2, wherein the underside of the needle plate (2) is provided with a relief groove (2 a), and the thread clamping piece (6) is positioned in the relief groove (2 a).
4. A sewing machine thread cutting mechanism according to claim 1, 2 or 3, characterized in that the sewing machine workbench (1) is fixedly provided with a motor mounting plate (9), the first driving part comprises a driving motor (10) fixed on the motor mounting plate (9), an output shaft of the driving motor (10) is perpendicular to the motor mounting plate (9), a crank (11) and a pull rod (12) are arranged between the output shaft of the driving motor (10) and the lower cutter (4), one end of the crank (11) is connected with the output shaft of the driving motor (10), the other end of the crank (11) is hinged with one end of the pull rod (12), the other end of the pull rod (12) is connected with the rear end of the lower cutter (4), a first sensor (14) is fixed on the motor mounting plate (9), a detection plate (16) is connected to the upper side of one end of the crank (11) connected with the output shaft of the driving motor (10), and the detection plate (16) is higher than the first sensor (14), and the driving motor (10) drives the lower cutter (4) to move forward to the first sensor (14) when sewing starts.
5. The thread cutting mechanism of sewing machine according to claim 1, 2 or 3, wherein the lower side of the needle plate (2) is fixed with a positioning plate (5), the positioning plate (5) is provided with positioning grooves (5 a) arranged at two end faces of the positioning plate (5), the upper cutter (3) and the lower cutter (4) are both positioned in the positioning grooves (5 a), the lower side of the front end of the positioning plate (5) is connected with a spring piece (7), the spring piece (7) is fixed with a felt (8), the felt (8) is positioned below the lower cutter (4) and the felt (8) is contacted with the lower cutter (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611075255.XA CN106436072B (en) | 2016-11-29 | 2016-11-29 | Thread cutting mechanism of sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611075255.XA CN106436072B (en) | 2016-11-29 | 2016-11-29 | Thread cutting mechanism of sewing machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106436072A CN106436072A (en) | 2017-02-22 |
| CN106436072B true CN106436072B (en) | 2023-07-11 |
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| CN107938192A (en) * | 2017-12-26 | 2018-04-20 | 方琳 | Cut the control method of bottom line device, sewing machine and sewing machine |
| CN108442051A (en) * | 2018-03-31 | 2018-08-24 | 宁波舒普机电股份有限公司 | A kind of trimming thread ends control mechanism of sewing machine |
| CN109234928B (en) * | 2018-11-14 | 2021-02-12 | 杰克缝纫机股份有限公司 | Thread trimming mechanism and sewing machine |
| CN109868574B (en) * | 2019-04-09 | 2024-03-01 | 拓卡奔马机电科技有限公司 | Double-acting knife thread cutting device and method for sewing machine |
| CN111020903B (en) * | 2019-12-17 | 2021-08-24 | 杰克缝纫机股份有限公司 | Seam-making thread trimming mechanism and method thereof |
| CN111218778B (en) * | 2020-02-27 | 2024-08-02 | 温州新固泰机械科技有限公司 | Needle lifting wireless head device |
| CN112226928B (en) * | 2020-11-11 | 2022-08-16 | 东莞市钰腾机械科技有限公司 | Sew with long stitches cutting device |
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Effective date of registration: 20200927 Address after: 198 Xinggang East Road, Damaiyu street, Yuhuan City, Taizhou City, Zhejiang Province Applicant after: ZOJE SEWING MACHINE Co.,Ltd. Address before: 317604, Taizhou, Zhejiang province Yuhuan County barley island Street Hing Tung Road, No. 198 Applicant before: ZOJE SEWING MACHINE Co.,Ltd. Applicant before: ZHEJIANG JOYEE SEWING MACHINE Co.,Ltd. Applicant before: ZHEJIANG BSM SEWING MACHINE Co.,Ltd. |
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