CN107059269B - Thread cutting device of sewing machine - Google Patents
Thread cutting device of sewing machine Download PDFInfo
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- CN107059269B CN107059269B CN201611205865.7A CN201611205865A CN107059269B CN 107059269 B CN107059269 B CN 107059269B CN 201611205865 A CN201611205865 A CN 201611205865A CN 107059269 B CN107059269 B CN 107059269B
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- arbor
- inner shaft
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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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- Sewing Machines And Sewing (AREA)
Abstract
The invention provides a thread trimming device of a sewing machine, and belongs to the technical field of machinery. The thread trimming device solves the problems that the existing thread trimming device of the sewing machine is not compact in structure, occupies large space and seriously influences the appearance of the sewing machine. This sewing machine thread trimming device, which comprises a fixed base, one side of fixing base has the blade mount pad, the end fixing of blade mount pad has the bottom knife, still be equipped with the supported hole that extends along fixing base length direction on the blade mount pad, wear to be equipped with in the supported hole with the supported hole precision fit can follow self axis pivoted arbor, the one end of arbor is fixed with the last blade that sets up with the bottom knife meshing, be equipped with on the fixing base and be used for driving the arbor along self axis pivoted driving piece, this driving piece is connected with the arbor with the coaxial setting of arbor and through transmission structure and arbor, be equipped with the adjustment structure that is used for making last blade and bottom knife closely mesh all the time between arbor and the blade mount pad. The invention has the advantages of compact structure, small occupied space, convenient installation, low cost and the like.
Description
Technical Field
The invention belongs to the technical field of machinery, and relates to a thread trimming device of a sewing machine.
Background
Along with the continuous development of the technological level, the automation degree of the sewing machine is higher and higher, the automatic thread trimming mechanism is generally arranged on the existing sewing machine, and after the cloth is placed in the sewing machine and begins to be sewn in place, the automatic thread trimming mechanism can be used for trimming the thread to separate the thread from the cloth, so that the sewing time can be saved, and the labor intensity of sewing workers is reduced.
For example, the chinese patent discloses a thread trimming device [ No. CN204959277U ] of a sewing machine, comprising a power device, wherein the power device is connected with a fixing member, the fixing member is connected with one end of a linkage arm through a linkage shaft, and the other end of the linkage arm is fixedly connected with a cutter bar along an axial direction; the power device can drive the cutter bar to rotate; one end of the cutter bar is fixedly provided with a movable blade, and one side of the movable blade is fixedly provided with a static blade; when the cutter bar rotates, the movable blade can be driven to rotate relative to the fixed blade, so that the movable blade and the fixed blade are contacted to form cutting force. The movable blade and the fixed blade form a blade group, the power device and the blade group are respectively arranged in the sewing machine as two independent parts, and the power device is arranged externally, occupies space, influences the integral aesthetic property of the sewing machine, is relatively troublesome to assemble and has high cost.
In order to solve the problem of external power of a thread trimming device, Chinese patent discloses another sewing machine function driving device and a sewing machine [ application publication No. CN105908400A ], and the device comprises a motor positioned in a machine head, wherein a first rotating shaft is arranged in the motor, the first rotating shaft is horizontally arranged and is perpendicular to a main shaft of the sewing machine, two ends of the first rotating shaft are respectively a first end part and a second end part, the first end part and the second end part extend out of a motor main body, a first cam part is fixed at the first end part, the first cam part drives a thread trimming mechanism of the sewing machine to act through a clutch mechanism, and a second cam part is fixed at the second end part. Two ends of the motor are respectively provided with a first cam piece and a second cam piece, and both ends of the motor can complete specific functions, and the motor is mainly built in.
In order to enable the action relationship between the first cam piece and the first connecting rod to be more flexible and the interaction to be smoother, the first cam piece comprises a third connecting rod, one section of the third connecting rod is fixed on the first rotating shaft of the motor, and the other end of the third connecting rod is provided with a bearing or a shaft sleeve. When the motor works, the first cam piece drives the first connecting rod to move, the first connecting rod drives the second moving rod to move axially, the transmission mode is complex, the motor and the second moving rod are not of an integrated structure, and the motor and the second moving rod are inconvenient to install.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a thread trimming device of a sewing machine, which is compact in structure and small in occupied space.
The purpose of the invention can be realized by the following technical scheme:
this sewing machine thread trimming device, including the fixing base, one side of fixing base has the blade mount pad, the end fixing of blade mount pad has the bottom knife, still is equipped with the supported hole that extends along fixing base length direction on the blade mount pad, the supported hole in wear to be equipped with the supported hole accurate complex can follow self axis pivoted arbor, the one end of arbor is fixed with the top knife that sets up with the bottom knife meshing, its characterized in that, the fixing base on be equipped with and be used for driving the arbor along self axis pivoted driving piece, this driving piece and the coaxial setting of arbor just are connected with the arbor through transmission structure, arbor and blade mount pad between be equipped with and be used for making the adjustment structure of top knife and bottom knife closely meshing all the time.
In the thread trimming device of the sewing machine, the transmission structure comprises an outer shaft sleeve and an inner shaft sleeve which is arranged in the outer shaft sleeve in a penetrating mode and matched with the outer shaft sleeve, and a linkage unit which is used for driving the inner shaft sleeve/the outer shaft sleeve to rotate along the central axis of the linkage unit when the outer shaft sleeve/the inner shaft sleeve axially moves under the action of the driving piece is arranged between the outer shaft sleeve and the inner shaft sleeve.
The transmission structure has two cases: when the outer shaft sleeve axially moves under the action of the driving piece, the linkage unit drives the inner shaft sleeve to rotate along the central axis of the inner shaft sleeve; when the inner shaft sleeve axially moves under the action of the driving piece, the linkage unit drives the outer shaft sleeve to rotate along the central axis of the outer shaft sleeve.
In the thread trimming device of the sewing machine, the outer shaft sleeve is coaxially and fixedly connected with the output shaft of the driving piece, the cutter shaft penetrates through the inner shaft sleeve and is coaxially matched with the inner shaft sleeve, a circumferential limiting structure is arranged between the cutter shaft and the inner shaft sleeve, the linkage unit comprises at least one first spiral track arranged on the inner shaft sleeve and a first limiting pin arranged on the outer shaft sleeve, the inner end of the first limiting pin is in sliding fit with the first spiral track, the number of the first limiting pins is equal to that of the first spiral tracks, and the first limiting pins and the first spiral tracks are arranged in a one-to-one correspondence mode. The positions of the first spiral track and the first limit pin can be interchanged, namely, the first spiral track is arranged on the outer sleeve, and the first limit pin is arranged on the inner sleeve.
The cross section of the first spiral track along the radial direction of the inner shaft sleeve is arc-shaped, and in order to ensure that the inner end of the first limiting pin can be accurately matched and can well slide in the first spiral track, the inner end of the first limiting pin is spherical. In order to facilitate the installation of the first limit pin, a radial threaded hole is formed in the outer shaft sleeve, the first limit pin is fixed in the radial threaded hole in a threaded mode, and the inner end of the first limit pin can slide well in the first spiral track.
In the thread trimming device of the sewing machine, the number of the first spiral tracks is 1-6.
In the above thread trimming device of the sewing machine, the number of the first spiral tracks is 2. When the number of the first spiral tracks is 2, the first spiral tracks are symmetrically distributed along the central axis of the inner shaft sleeve, stability between the inner shaft sleeve and the outer shaft sleeve during linkage is guaranteed, transmission precision is improved, and therefore rotation precision of the inner shaft sleeve is guaranteed.
In the above thread trimming device of a sewing machine, the number of the first spiral tracks is 3. In a similar way, the first 3 spiral tracks are distributed in an annular array, stability between the inner shaft sleeve and the outer shaft sleeve during linkage is guaranteed, and transmission precision is improved.
In foretell sewing machine thread trimming device, the output shaft of inner shaft cover and driving piece coaxial link firmly, the arbor coaxial wear to establish in outer axle sleeve and arbor and outer axle sleeve circumference fixed, the linkage unit include at least one locate spiral track two on the outer axle sleeve and locate its inner and two sliding fit's of spiral track two spacer pins two on the inner shaft sleeve, the quantity of spacer pin two equals with the quantity of spiral track two and two one-to-one settings of spacer pin two and spiral track. The positions of the second spiral track and the second limit pin can be interchanged, namely, the second spiral track is arranged on the inner shaft sleeve, and the second limit pin is arranged on the outer shaft sleeve.
In the thread trimming device of the sewing machine, the number of the second spiral tracks is 1-6.
In the above thread trimming device of the sewing machine, the number of the second spiral track is 2. When the number of the second spiral tracks is 2, the second spiral tracks are symmetrically distributed along the central axis of the outer shaft sleeve, stability between the outer shaft sleeve and the inner shaft sleeve during linkage is guaranteed, transmission precision is improved, and therefore rotation precision of the outer shaft sleeve is guaranteed.
In the above thread trimming device of the sewing machine, the number of the second spiral tracks is 3. In a similar way, the 3 spiral tracks II are distributed in an annular array, stability between the outer shaft sleeve and the inner shaft sleeve during linkage is guaranteed, and transmission precision is improved.
In the thread trimming device of the sewing machine, the circumferential limiting structure comprises a limiting plane arranged on the cutter shaft and a limiting column arranged on the inner shaft sleeve and attached to the limiting plane, a positioning hole is formed in the inner shaft sleeve, and the limiting column penetrates through the positioning hole.
The limiting column can be directly fixed in the positioning hole in a threaded mode, after the fixing is completed, the inner end of the limiting column is required to be attached to the limiting plane, and the outer end of the limiting column cannot protrude out of the outer surface of the inner shaft sleeve, so that interference with the outer shaft sleeve is prevented.
In the thread trimming device of the sewing machine, the thread pitch of the first spiral track is 10-100 mm. The self-locking phenomenon of the limiting pin and the inner shaft sleeve is prevented.
In the thread trimming device of the sewing machine, the driving piece is an air cylinder, an external thread is arranged on the part of a piston rod of the air cylinder, which extends out of the cylinder body, an internal thread hole which is coaxially arranged with a piston rod of the air cylinder is arranged on the outer shaft sleeve, and the piston rod of the air cylinder is in threaded connection with the internal thread hole of the outer shaft sleeve.
The outer shaft sleeve is barrel-shaped, one end of the outer shaft sleeve, which is close to the cylinder, is provided with a bottom, and an internal thread hole is arranged in the center of the bottom. In order to improve the connection stability of the outer shaft sleeve and the piston rod of the air cylinder, a locking nut which is abutted against the outer shaft sleeve is connected to the piston rod of the air cylinder in a threaded mode, and therefore the outer shaft sleeve and the piston rod of the air cylinder are guaranteed not to rotate.
The cross section of the piston rod in the cylinder body is polygonal, so that the piston rod cannot rotate in the cylinder body, and meanwhile, the cylinder does not rotate. The fixed seat is provided with a supporting seat, the supporting seat is provided with an installation hole coaxial with the cutter shaft, and the cylinder is coaxially fixed in the installation hole. Of course, the driving member may also be a rotary cylinder, in which case the radial rotation of the outer sleeve is limited.
The driving part can be a hydraulic cylinder, a push-pull electromagnet or any power source device with an output shaft capable of axially moving besides a cylinder. The driving piece can be a one-way motion cylinder besides a reciprocating motion cylinder, and the effect of the reciprocating motion cylinder can be achieved by adding a return spring in the one-way motion cylinder. Of course, the driving part can also be a motor, and an output shaft of the motor is directly connected with the cutter shaft in a transmission way through a coupling.
In the thread trimming device of the sewing machine, the adjusting structure comprises a limiting ring fixed on the cutter shaft and a spring sleeved on the cutter shaft, one end of the spring is abutted against the limiting ring, the other end of the spring is abutted against the blade mounting seat, the limiting ring is abutted against the inner shaft sleeve under the elastic force action of the spring, and at the moment, the upper blade is tightly meshed with the lower blade.
When a piston rod of the air cylinder extends out or retracts, the piston rod generates axial movement, the inner shaft sleeve is driven to rotate without fail, meanwhile, the inner shaft sleeve can generate slight axial movement in the axial direction, but under the action of the spring, the cutter shaft is driven to move slightly in the axial direction, so that the inner shaft sleeve is reset, and the upper blade and the lower blade are always guaranteed to be tightly meshed.
In the thread trimming device of the sewing machine, the cutter shaft is provided with an annular groove, the limit ring is clamped in the annular groove, and the side part of the limit ring is provided with an opening.
The limiting ring is an open ring and has certain elasticity, the size of the opening is smaller than the outer diameter of the cutter shaft, and the limiting ring is prevented from falling off after being clamped in the annular groove. The limiting ring is a split ring, can be conveniently connected into the limiting groove, and is convenient to install and disassemble.
In the device, the rotating angle of the upper blade is controlled by the linear motion distance of the outer shaft sleeve and the screw pitch of the spiral track of the inner shaft sleeve, and the rotating direction of the upper blade is controlled by the rotating direction of the spiral track of the inner shaft sleeve and the moving direction of the piston rod of the air cylinder. The working principle is as follows: when the air cylinder is ventilated, the piston rod moves linearly, the limiting pin I in the outer shaft sleeve moves in the spiral track I of the inner shaft sleeve, the linear movement of the piston rod is changed into the rotation of the cutter shaft, and the swinging of the upper blade is controlled to be matched with the lower blade to form the thread shearing action. And the inlet and the outlet of the air cylinder are exchanged, the piston rod moves linearly in the reverse direction, the cutter shaft rotates in the reverse direction, the upper blade is reset, and the thread trimming action is finished.
Compared with the prior art, the thread trimming device of the sewing machine has the following advantages:
the driving piece and the cutter shaft are coaxially arranged, so that the whole structure is more compact, the occupied space is small, the driving piece and the cutter shaft are completely arranged above the right side of the sewing table, and the integral attractiveness of the sewing machine is not influenced; the power transmission is realized through the first spiral track arranged on the inner shaft sleeve and the first limit pin arranged on the outer shaft sleeve, the linear motion is changed into rotation, the transmission stability is good, the precision is higher, and the occupied space is greatly saved compared with the prior connecting rod transmission; and it is convenient to install, with low costs.
Drawings
Fig. 1 is a schematic partial structural diagram of a first embodiment of the present invention.
Fig. 2 is a cross-sectional view of a first embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a linkage unit according to a first embodiment of the present invention.
Fig. 4 is a schematic structural diagram of an inner bushing according to a first embodiment of the present invention.
Fig. 5 is a schematic view illustrating a matching state of the cutter shaft and the inner sleeve according to the first embodiment.
Fig. 6 is a sectional view of a second embodiment of the present invention.
Fig. 7 is a schematic view of the fitting state of the outer sleeve and the inner sleeve in the second embodiment.
In the figure, 1, a fixed seat; 2. a blade mount; 3. a lower blade; 4. a cutter shaft; 5. an upper blade; 6. a drive member; 7. an outer sleeve; 8. an inner sleeve; 9. a first spiral track; 10. a first limiting pin; 11. a limiting plane; 12. positioning holes; 13. a limiting ring; 14. a spring; 15. an annular groove; 16. locking the nut; 17. a supporting seat; 18. a second spiral track; 19. and a second limit pin.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
Example one
The thread trimming device of the sewing machine shown in figure 1 comprises a fixed seat 1, wherein a blade mounting seat 2 is arranged on one side of the fixed seat 1, a lower blade 3 is fixed at the end part of the blade mounting seat 2, a supporting hole extending along the length direction of the fixed seat 1 is further formed in the blade mounting seat 2, a cutter shaft 4 which is precisely matched with the supporting hole and can rotate along the central axis of the cutter shaft 4 is arranged in the supporting hole in a penetrating mode, and an upper blade 5 which is meshed with the lower blade 3 is fixed at one end of the cutter shaft 4.
As shown in fig. 1, a driving member 6 for driving the cutter shaft 4 to rotate along its central axis is disposed on the fixing base 1, the driving member 6 is disposed coaxially with the cutter shaft 4 and connected to the cutter shaft 4 through a transmission structure, and an adjusting structure for always tightly engaging the upper blade 5 with the lower blade 3 is disposed between the cutter shaft 4 and the blade mounting base 2.
The transmission structure comprises an outer shaft sleeve 7 and an inner shaft sleeve 8 which is arranged in the outer shaft sleeve 7 in a penetrating mode and matched with the outer shaft sleeve 7, and in the embodiment, as shown in fig. 2 and 3, when the outer shaft sleeve 7 moves axially under the action of a driving piece 6, a linkage unit drives the inner shaft sleeve 8 to rotate along the central axis of the inner shaft sleeve.
As shown in fig. 2, the outer shaft sleeve 7 is coaxially and fixedly connected with the output shaft of the driving member 6, the cutter shaft 4 is arranged in the inner shaft sleeve 8 in a penetrating manner and coaxially matched with the inner shaft sleeve 8, a circumferential limiting structure is arranged between the cutter shaft 4 and the inner shaft sleeve 8, the linkage unit comprises at least one first spiral track 9 arranged on the inner shaft sleeve 8 and a first limiting pin 10 arranged on the outer shaft sleeve 7 and in sliding fit with the first spiral track 9, the number of the first limiting pins 10 is equal to that of the first spiral tracks 9, and the first limiting pins 10 are arranged in one-to-one correspondence with the first spiral tracks 9.
The cross section of the first spiral track 9 in the radial direction of the inner shaft sleeve 8 is arc-shaped, and in order to ensure that the inner end of the first limit pin 10 can be accurately matched and can well slide in the first spiral track 9, the inner end of the first limit pin 10 is spherical. In order to facilitate the installation of the first limit pin 10, a radial threaded hole is formed in the outer shaft sleeve 7, the first limit pin 10 is fixed in the radial threaded hole in a threaded mode, and the inner end of the first limit pin can slide in the first spiral track 9 well.
Wherein, the number of the first spiral tracks 9 is 1-6.
In this embodiment, as shown in fig. 4, the number of the first spiral tracks 9 is 2, and the first spiral tracks are symmetrically distributed along the central axis of the inner shaft sleeve 8, so that stability between the inner shaft sleeve 8 and the outer shaft sleeve 7 during linkage is ensured, transmission precision is improved, and rotation precision of the inner shaft sleeve 8 is ensured.
In the embodiment, the screw pitch of the first spiral track 9 is 10-100mm, so that the self-locking phenomenon of the first limit pin 10 and the inner shaft sleeve 8 is prevented.
As shown in fig. 5, the circumferential limiting structure includes a limiting plane 11 disposed on the cutter shaft 4 and a limiting post disposed on the inner shaft sleeve 8 and attached to the limiting plane 11, the inner shaft sleeve 8 is provided with a positioning hole 12, and the limiting post is inserted into the positioning hole 12.
The limiting column can be directly fixed in the positioning hole 12 in a threaded mode, after the fixing is completed, the inner end of the limiting column is required to be attached to the limiting plane 11, and the outer end of the limiting column cannot protrude out of the outer surface of the inner shaft sleeve 8, so that the interference with the outer shaft sleeve 7 is prevented.
In this embodiment, as shown in fig. 1 and 2, the driving member 6 is a cylinder, and as shown in fig. 2, a portion of a piston rod of the cylinder extending out of the cylinder body has an external thread, the outer sleeve 7 has an internal thread hole coaxially disposed with the piston rod of the cylinder, and the piston rod of the cylinder is threadedly connected in the internal thread hole of the outer sleeve 7.
Specifically, as shown in fig. 2, the outer sleeve 7 is barrel-shaped and has a bottom portion at one end close to the cylinder, wherein the internal threaded hole is formed in the center of the bottom portion. In order to improve the connection stability of the outer sleeve 7 and the piston rod of the cylinder, as shown in fig. 2, a locking nut 16 abutting against the outer sleeve 7 is screwed on the piston rod of the cylinder to ensure that the outer sleeve 7 and the piston rod of the cylinder do not rotate.
In this embodiment, the piston rod of the cylinder cannot rotate along the circumferential direction of the axis of the cylinder, and the cross section of the part of the piston rod, which is located inside the cylinder body, is polygonal, so that the piston rod is ensured not to rotate inside the cylinder body. The fixed seat 1 is provided with a supporting seat 17, the supporting seat 17 is provided with an installation hole coaxial with the cutter shaft 4, and the cylinder is coaxially fixed in the installation hole.
As shown in fig. 2, the adjusting structure includes a limiting ring 13 fixed on the knife shaft 4 and a spring 14 sleeved on the knife shaft 4, one end of the spring 14 abuts against the limiting ring 13, the other end of the spring abuts against the blade mounting seat 2, the limiting ring 13 abuts against the inner shaft sleeve 8 under the elastic force of the spring 14, and at this time, the upper blade 5 is tightly engaged with the lower blade 3.
When the piston rod of the cylinder extends or retracts, the piston rod generates axial movement, the inner shaft sleeve 8 is driven to rotate without fail, meanwhile, the inner shaft sleeve 8 may generate slight axial movement in the axial direction, but under the action of the spring 14, the cutter shaft 4 is driven to slightly move in the axial direction, so that the inner shaft sleeve 8 is reset, and the upper blade 5 is always ensured to be tightly meshed with the lower blade 3.
Specifically, as shown in fig. 5, the knife shaft 4 has an annular groove 15, the limiting ring 13 is clamped in the annular groove 15, and the side of the limiting ring 13 has an opening. The limiting ring 13 is an open ring and has certain elasticity, and the size of the opening is smaller than the outer diameter of the cutter shaft 4, so that the limiting ring 13 is prevented from falling off after being clamped in the annular groove 15. The limiting ring 13 is a split ring, can be conveniently connected into a limiting groove, and is convenient to mount and dismount.
In the device, the rotating angle of the upper blade 5 is controlled by the linear motion distance of the outer shaft sleeve 7 and the first 9 screw pitches of the spiral track of the inner shaft sleeve 8, and the rotating direction of the first 9 spiral track of the inner shaft sleeve 8 and the moving direction of the piston rod of the air cylinder control the rotating direction of the upper blade 5. The working principle is as follows: when the air cylinder is ventilated, the piston rod moves linearly, the limiting pin I10 in the outer shaft sleeve 7 moves in the spiral track I9 of the inner shaft sleeve 8, the linear movement of the piston rod is changed into the rotation of the cutter shaft 4, the swinging of the upper blade 5 is controlled, and the lower blade 3 is matched to form a thread cutting action. And the inlet and the outlet of the air cylinder are exchanged, the piston rod moves linearly in the reverse direction, the cutter shaft 4 rotates in the reverse direction, the upper blade 5 is reset, and the thread trimming action is finished.
According to the thread trimming device of the sewing machine, the driving piece 6 and the cutter shaft 4 are coaxially arranged, so that the whole structure is more compact, the occupied space is small, the thread trimming device is completely arranged above the right side of a sewing table of the sewing machine, and the integral attractiveness of the sewing machine is not influenced; the power transmission is realized through the first spiral track 9 arranged on the inner shaft sleeve 8 and the first limit pin 10 arranged on the outer shaft sleeve 7, the linear motion is changed into rotation, the transmission stability is good, the precision is higher, and the occupied space is greatly saved compared with the prior connecting rod transmission; and it is convenient to install, with low costs.
Example two
The structure principle of the present embodiment is substantially the same as that of the first embodiment, except that, as shown in fig. 6 and 7, the inner bushing 8 is connected to the piston rod of the driving member 6, the outer bushing 7 is connected to the cutter shaft 4, and when the inner bushing 8 moves axially under the action of the driving member 6, the outer bushing 7 is driven to rotate circumferentially.
As shown in fig. 7, the outer shaft sleeve 7 is provided with at least one second spiral track 18, the inner shaft sleeve 8 is provided with second limit pins 19, the outer ends of the second limit pins are in sliding fit with the second spiral tracks 18, the number of the second limit pins 19 is equal to that of the second spiral tracks 18, and the second limit pins 19 are arranged in one-to-one correspondence with the second spiral tracks 18.
In order to ensure that the inner end of the second limit pin 19 can be accurately matched and can well slide in the second spiral track 18, the outer end of the second limit pin 19 is spherical. In order to facilitate the installation of the second limit pin 19, a radial threaded hole is formed in the inner shaft sleeve 8, the second limit pin 19 is fixed in the radial threaded hole in a threaded mode, and the outer end of the second limit pin can slide well in the second spiral track 18.
In this embodiment, as shown in fig. 7, the number of the second spiral tracks 18 is 2 and the second spiral tracks are uniformly distributed.
EXAMPLE III
The structural principle of this embodiment is the same basically as that of embodiment one, and the difference lies in that spiral track 9 is 3 and is annular array distribution, guarantees the stationarity between interior axle sleeve 8 and the outer axle sleeve 7 during the linkage, improves the transmission precision.
Example four
The structure principle of the present embodiment is basically the same as that of the first embodiment, except that the driving member 6 is a hydraulic cylinder, a push-pull electromagnet or other power source device with an output shaft capable of axially moving.
EXAMPLE five
The structure principle of this embodiment is basically the same as that of the first embodiment, and the difference is that the driving member 6 is an output shaft of a motor and is directly in transmission connection with the cutter shaft 4 through a coupler.
EXAMPLE six
The structure principle of this embodiment is basically the same as that of embodiment one, and the difference lies in that driving piece 6 is the unidirectional motion cylinder, through increasing reset spring in the inside of unidirectional motion cylinder, can reach the effect of reciprocating motion cylinder equally.
EXAMPLE seven
The structure principle of the present embodiment is basically the same as that of the first embodiment, except that the driving member 6 may also be a rotary cylinder, and the radial rotation of the outer sleeve 7 needs to be limited.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (7)
1. The utility model provides a sewing machine thread trimming device, includes fixing base (1), one side of fixing base (1) has blade mount pad (2), the end fixing of blade mount pad (2) has bottom knife (3), still is equipped with the supported hole that extends along fixing base (1) length direction on blade mount pad (2), the supported hole in wear to be equipped with and to follow self axis pivoted arbor (4) with supported hole precision fit, the one end of arbor (4) is fixed with last blade (5) that set up with bottom knife (3) meshing, a serial communication port, fixing base (1) on be equipped with and be used for driving arbor (4) along self axis pivoted driving piece (6), this driving piece (6) and arbor (4) coaxial setting just become pivoted transmission structure and arbor (4) through being used for with linear motion and be connected, arbor (4) and blade mount pad (2) between be equipped with and be used for making last blade (5) and bottom knife (3) all the time and be connected with bottom knife (3), blade (3) are equipped with all the time ) A closely engaged adjustment structure; the transmission structure comprises a structure I or a structure II;
the structure I is as follows: the outer shaft sleeve (7) and the inner shaft sleeve (8) are arranged in the outer shaft sleeve (7) in a penetrating mode and matched with the outer shaft sleeve (7), and a linkage unit used for driving the inner shaft sleeve (8) to rotate along the central axis of the outer shaft sleeve (8) when the outer shaft sleeve (7) axially moves under the action of the driving piece (6) is arranged between the outer shaft sleeve (7) and the inner shaft sleeve (8);
the outer shaft sleeve (7) is coaxially and fixedly connected with an output shaft of the driving part (6), the cutter shaft (4) penetrates through the inner shaft sleeve (8) and is coaxially matched with the inner shaft sleeve (8), a circumferential limiting structure is arranged between the cutter shaft (4) and the inner shaft sleeve (8), the linkage unit comprises at least one spiral track I (9) arranged on the inner shaft sleeve (8) and a limiting pin I (10) which is arranged on the outer shaft sleeve (7) and is in sliding fit with the spiral track I (9), the number of the limiting pin I (10) is equal to that of the spiral track I (9), and the limiting pin I (10) and the spiral track I (9) are arranged in a one-to-one correspondence manner;
the structure II is as follows: the outer shaft sleeve (7) and the inner shaft sleeve (8) are arranged in the outer shaft sleeve (7) in a penetrating mode and matched with the outer shaft sleeve (7), and a linkage unit used for driving the outer shaft sleeve (7) to rotate along the central axis of the inner shaft sleeve (7) when the inner shaft sleeve (8) axially moves under the action of the driving piece (6) is arranged between the outer shaft sleeve (7) and the inner shaft sleeve (8); inner shaft sleeve (8) and the output shaft of driving piece (6) coaxial link firmly, arbor (4) coaxial wear to establish in outer shaft sleeve (7) and arbor (4) and outer shaft sleeve (7) circumference fixed, the linkage unit include that at least one locates two (18) of spiral track on outer shaft sleeve (7) and locate its inner and two (18) sliding fit's of spiral track two (19) on inner shaft sleeve (8), the quantity of two (19) of spacer pin equals with the quantity of two (18) of spiral track and two (19) of spacer pin and two (18) one-to-one setting of spiral track.
2. The trimming device for sewing machines according to claim 1, characterized in that said first spiral track (9) is comprised between 1 and 6.
3. The trimming device for sewing machines according to claim 2, characterized in that said first spiral track (9) is 2.
4. The trimming device of sewing machine according to claim 1, 2 or 3, wherein the circumferential limiting structure comprises a limiting plane (11) arranged on the knife shaft (4) and a limiting column arranged on the inner shaft sleeve (8) and attached to the limiting plane (11), the inner shaft sleeve (8) is provided with a positioning hole (12), and the limiting column is inserted into the positioning hole (12).
5. The trimming device of sewing machines according to claim 1, 2 or 3, characterized in that the pitch of the first helical track (9) is 10-100 mm.
6. The thread trimming device of sewing machine according to claim 1, 2 or 3, wherein the driving member (6) is a cylinder, the portion of the piston rod of the cylinder extending out of the cylinder body has an external thread, the outer sleeve (7) has an internal threaded hole coaxially disposed with the piston rod of the cylinder, and the piston rod of the cylinder is threadedly coupled in the internal threaded hole of the outer sleeve (7).
7. The thread trimming device of sewing machine according to claim 1, 2 or 3, wherein the adjusting structure comprises a limiting ring (13) fixed on the knife shaft (4) and a spring (14) sleeved on the knife shaft (4), one end of the spring (14) abuts against the limiting ring (13), the other end of the spring (14) abuts against the blade mounting seat (2), the limiting ring (13) abuts against the inner shaft sleeve (8) under the elastic force of the spring (14), and the upper blade (5) is tightly engaged with the lower blade (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611205865.7A CN107059269B (en) | 2016-12-23 | 2016-12-23 | Thread cutting device of sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611205865.7A CN107059269B (en) | 2016-12-23 | 2016-12-23 | Thread cutting device of sewing machine |
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| CN107059269B true CN107059269B (en) | 2020-06-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110938947B (en) * | 2019-12-20 | 2021-11-02 | 浙江宝宇缝纫机股份有限公司 | Transmission shaft supporting structure of sewing machine |
| CN113396714B (en) * | 2021-05-28 | 2023-10-20 | 浙江亚特电器股份有限公司 | Blade of pruning tool |
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| CN87212542U (en) * | 1987-12-03 | 1988-09-07 | 上海针织机械三厂 | Mechnical semi-automatic thread cutting machine |
| CN204000211U (en) * | 2014-06-06 | 2014-12-10 | 拓卡奔马机电科技有限公司 | Knife structure in a kind of muti needle chainstitch m/c |
| CN204875126U (en) * | 2015-08-22 | 2015-12-16 | 台州市三本缝制设备有限公司 | Automatic trimming top cop latch device of sewing machine circular knife |
| CN205258817U (en) * | 2015-12-26 | 2016-05-25 | 东莞市飞杰电脑针车有限公司 | Pneumatic trapping mechanism |
| CN205636087U (en) * | 2016-05-23 | 2016-10-12 | 温州市亨泰缝制设备有限公司 | Automatic manual dual -purpose thread trimmer devices |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100575079C (en) * | 2007-12-15 | 2009-12-30 | 中北大学 | Can be automatically to the high speed curved surface printing machine of version |
| CN102116308B (en) * | 2011-04-13 | 2012-08-29 | 襄樊五二五泵业有限公司 | Adjustable mechanical sealing structure for pump |
| CN105889340A (en) * | 2015-01-13 | 2016-08-24 | 石河子大学 | Rotary unloading mechanism between boxes |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87212542U (en) * | 1987-12-03 | 1988-09-07 | 上海针织机械三厂 | Mechnical semi-automatic thread cutting machine |
| CN204000211U (en) * | 2014-06-06 | 2014-12-10 | 拓卡奔马机电科技有限公司 | Knife structure in a kind of muti needle chainstitch m/c |
| CN204875126U (en) * | 2015-08-22 | 2015-12-16 | 台州市三本缝制设备有限公司 | Automatic trimming top cop latch device of sewing machine circular knife |
| CN205258817U (en) * | 2015-12-26 | 2016-05-25 | 东莞市飞杰电脑针车有限公司 | Pneumatic trapping mechanism |
| CN205636087U (en) * | 2016-05-23 | 2016-10-12 | 温州市亨泰缝制设备有限公司 | Automatic manual dual -purpose thread trimmer devices |
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| CN107059269A (en) | 2017-08-18 |
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Address after: 318014 No. 1008, east section of Donghai Avenue, Sanjia, Jiaojiang District, Taizhou City, Zhejiang Province Patentee after: Jack Technology Co.,Ltd. Address before: 318010 No. 15 Airport South Road, Jiaojiang District, Zhejiang, Taizhou Patentee before: JACK SEWING MACHINE Co.,Ltd. |
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