CN114687082B - Sewing machine and thread cutting method thereof - Google Patents
Sewing machine and thread cutting method thereof Download PDFInfo
- Publication number
- CN114687082B CN114687082B CN202011641048.2A CN202011641048A CN114687082B CN 114687082 B CN114687082 B CN 114687082B CN 202011641048 A CN202011641048 A CN 202011641048A CN 114687082 B CN114687082 B CN 114687082B
- Authority
- CN
- China
- Prior art keywords
- assembly
- presser foot
- rod
- cam
- wire cutting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B65/00—Devices for severing the needle or lower thread
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B29/00—Pressers; Presser feet
- D05B29/02—Presser-control devices
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
The invention discloses a sewing machine and a thread cutting method of the sewing machine. The pushing part of the driving main rod is propped against the wire cutting cam, and the side surface of the wire cutting cam arranged on the lower shaft is provided with a U-shaped rail groove formed by sequentially connecting a cutter outlet section, a holding section and a cutter returning section. When the pushing piece rolls over the cutter outlet section, the wire cutting elastic piece pulls the driving main rod to swing through contraction, and the driving main rod drives the wire cutting assembly to execute cutter outlet action; when the pushing piece rolls over the cutter returning section, the wire cutting cam pushes the driving main rod to swing through the pushing piece, and the driving main rod drives the wire cutting assembly to execute cutter returning action. The thread cutting elastic piece drives the thread cutting assembly to execute the knife-out action, the thread cutting cam drives the thread cutting assembly to execute the knife-returning action, the power provided by the lower shaft is larger, the suture is easy to cut, and the working reliability is higher.
Description
Technical Field
The invention relates to the technical field of sewing machines, in particular to a sewing machine and a thread cutting method of the sewing machine.
Background
Referring to fig. 1, the wire cutting mechanism of the existing sewing machine comprises a driving assembly and a wire cutting assembly, wherein the driving assembly comprises an electromagnet 01, an electromagnet rod 02, a wire cutting shaft 03, a wire cutting shaft plate 04, a main rod assembly 05 and a wire cutting cam 06, two ends of the electromagnet rod 02 are respectively hinged with the electromagnet 01 and the wire cutting shaft 03, the wire cutting shaft 03 is fixed on the wire cutting shaft plate 04, the main rod assembly 05 slidably penetrates through the wire cutting shaft plate 04, a roller is arranged at the top end of the main rod assembly 05, a clamp spring is clamped at the bottom end of the main rod assembly 05, and a reset spring with two ends respectively propped against the wire cutting shaft plate 04 and the clamp spring is arranged on the main rod assembly 05 in a penetrating mode. The tangent line subassembly includes length adjustment pole 07, right tangent line lever 08, tangent line link assembly 09 and left tangent line lever 010, and the one end that mobile jib subassembly 05 is close to the gyro wheel articulates with length adjustment pole 07, and length adjustment pole 07 articulates with right tangent line lever 08, and tangent line link assembly 09's both ends articulate with right tangent line lever 08 and left tangent line lever 010 respectively.
When cutting wires, the electromagnet 01 is attracted, the electromagnet 01 pushes the cutting wire shaft 03 to move upwards through the electromagnet rod 02, the cutting wire shaft 03 drives the main rod assembly 05 to move upwards synchronously through the cutting wire shaft plate 04, the roller of the main rod assembly 05 enters the cam groove of the cutting wire cam 06, the cutting wire cam 06 drives the main rod assembly 05 to rotate rightwards, the main rod assembly 05 pushes the length adjusting connecting rod 07 hinged with the main rod assembly 05 to move rightwards, the length adjusting connecting rod 07 drives the right cutting wire lever 08 to rotate clockwise, the right cutting wire lever 08 drives the left cutting wire lever 010 to rotate clockwise synchronously through the cutting wire connecting rod assembly 09, and then the right moving cutter shaft and the left moving cutter are enabled to rotate synchronously to cut wires.
The thread cutting mechanism of the existing sewing machine generally drives the right thread cutting lever 08 and the left thread cutting lever 010 to synchronously cut the thread by means of the elastic force of the spring, the thread cutting power provided by the spring is relatively small, the thread is difficult to cut, the spring is extremely easy to be blocked due to overlarge resistance, the smooth thread cutting is affected, and therefore the working reliability of the thread cutting mechanism of the existing sewing machine is relatively low.
Disclosure of Invention
In view of the above, the present invention aims to provide a sewing machine, in which the elastic force of the thread cutting elastic member is used to drive the thread cutting assembly to perform the knife-out action, the driving force applied to the thread cutting cam by the lower shaft is used to drive the thread cutting assembly to perform the knife-back action, the power of the lower shaft is high, the thread is easy to cut, and the working reliability is high. Another object of the present invention is to provide a thread cutting method of a sewing machine.
The lower shaft drives the thread cutting assembly to execute thread cutting action through the thread cutting cam, a separate external power source is not needed, the structure is simpler, and the cost is reduced.
The specific scheme is as follows:
the sewing machine provided by the invention comprises:
a wire cutting assembly;
one end of the driving main rod is rotatably arranged, and the other end of the driving main rod is hinged with the wire cutting assembly; the thread cutting assembly comprises a thread cutting elastic piece, one end of which is fixed and the other end of which is connected with the driving main rod;
a thread cutting cam which is propped against the pushing piece of the driving main rod and is used for synchronously rotating along with the lower shaft; the side surface of the thread cutting cam is provided with a U-shaped rail groove formed by sequentially connecting a cutter outlet section, a retaining section and a cutter returning section;
when the pushing piece rolls over the cutter outlet section, the wire cutting elastic piece pulls the driving main rod to swing through contraction, and the driving main rod drives the wire cutting assembly to execute cutter outlet action;
when the pushing piece rolls over the holding section, the wire cutting assembly is kept still;
when the pushing piece rolls over the cutter returning section, the wire cutting cam pushes the driving main rod to swing through the pushing piece, and the driving main rod drives the wire cutting assembly to execute cutter returning action.
Preferably, two ends of the U-shaped rail groove are respectively connected with a non-shearing segment arranged on the end face of the shearing cam, and when the pushing piece rolls over the non-shearing segment, the shearing assembly does not act.
Preferably, the method further comprises:
a presser foot lifting assembly;
an eccentric drive assembly;
a support rod group hinged with the driving main rod;
the limiting assembly is arranged between the eccentric driving assembly and the abutting rod group;
when the eccentric driving assembly drives the presser foot lifting assembly to execute the presser foot lifting action, the limiting assembly abuts against the abutting rod group so as to prevent the pushing piece from abutting against the U-shaped rail groove;
when the eccentric driving assembly drives the limiting assembly to be far away from the abutting rod group to release the limitation, the presser foot lifting assembly does not act.
Preferably, lift the presser foot subassembly and including lifting the presser foot gyro wheel, spacing subassembly includes spacing gyro wheel, and eccentric drive subassembly includes:
driving the rotating shaft;
the presser foot lifting cam and the limit cam are coaxially and fixedly arranged on the driving rotating shaft; the presser foot lifting cam is abutted against the presser foot lifting roller, and the limit cam is abutted against the limit roller;
when the driving rotating shaft rotates positively by a first preset rotation angle, the presser foot lifting cam jacks up the presser foot lifting roller to enable the presser foot lifting assembly to execute the presser foot lifting action, and the limiting roller abuts against the limiting section of the end face of the limiting cam to enable the limiting assembly to abut against the abutting rod group;
when the driving rotating shaft reversely rotates by a second preset rotation angle, the limiting roller falls into a shearing groove arranged on the side surface of the limiting cam so that the limiting component is far away from the abutting rod group.
Preferably, the limit assembly further comprises a driving swing rod and a driven swing rod which are rotatably arranged at one end and provided with limit rollers, and a middle connecting rod hinged between the driving swing rod and the driven swing rod; the abutting rod group comprises a limiting swing rod which is arranged opposite to the driven swing rod and a limiting connecting rod hinged between the limiting swing rod and the driving main rod;
when the limit roller rolls from a shearing groove arranged on the side surface of the limit cam to a limit section on the end surface of the limit cam, the driven swing rod abuts against the limit swing rod;
when the limiting roller falls into the shearing groove, the driven swing rod is far away from the limiting swing rod.
Preferably, the wire cutting assembly includes:
a length adjusting connecting rod hinged with the driving main rod;
the right thread cutting lever is hinged with the length adjusting connecting rod through a pivot shaft, and the movable end of the thread cutting elastic piece is fixedly connected with the pivot shaft;
when the pushing piece rolls over the cutter outlet section, the wire cutting elastic piece pulls the length adjusting connecting rod to swing through contraction so that the right wire cutting lever and the driving main rod synchronously and positively swing along with the length adjusting connecting rod, and the right wire cutting lever realizes a cutter;
when the pushing piece rolls over the cutter returning section, the thread cutting cam overcomes the elastic force of the thread cutting elastic piece to push the driving main rod to swing, so that the driving main rod drives the length adjusting connecting rod to swing reversely and synchronously with the right thread cutting lever, and the cutter returning is realized by the right thread cutting lever.
Preferably, the presser foot lifting assembly comprises:
a presser foot lifting lever provided with a presser foot lifting roller;
a presser foot lifting connecting rod;
the knee control connecting rod is connected between the presser foot lifting lever and the presser foot lifting connecting rod;
a compression bar provided with a compression bar hoop;
when the highest point of the presser foot lifting cam is propped against the presser foot lifting roller, the presser foot lifting connecting rod lifts the pressing rod through the pressing rod hoop.
Preferably, the eccentric driving assembly comprises a driving motor fixedly connected with the driving rotating shaft, and the driving motor is arranged on the rear window plate.
Preferably, the presser foot lifting device further comprises a controller connected with the driving motor, and the controller controls the driving motor to positively rotate by a first preset rotation angle from an initial preset rotation angle according to the received presser foot lifting instruction.
Preferably, the device further comprises a rotation angle detection piece which is connected with the controller and used for detecting the rotation angle of the driving motor; when the rotation angle detection piece detects that the driving motor rotates forwards by a first preset rotation angle, the controller controls the driving motor to rotate reversely according to the signal fed back by the rotation angle detection piece until the rotation angle is restored to the initial preset rotation angle.
Preferably, the controller controls the driving motor to reversely rotate by a second preset corner from the initial preset corner according to the received wire cutting instruction, and when the corner detection piece detects that the driving motor reversely rotates by the second preset corner, the controller controls the driving motor to stop rotating according to a signal fed back by the corner detection piece.
The thread cutting method of the sewing machine provided by the invention is applied to any one of the sewing machines, and comprises the following steps:
the thread cutting cam synchronously rotates along with the lower shaft;
the pushing piece of the driving main rod sequentially rolls through a U-shaped rail groove formed by sequentially connecting a cutter outlet section, a holding section and a cutter returning section;
when the pushing piece rolls over the cutter outlet section, the wire shearing elastic piece of the wire shearing assembly drives the main rod to swing through contraction and pulling, and the main rod is driven to drive the wire shearing assembly to execute cutter outlet action;
when the pushing piece rolls over the holding section, the wire cutting assembly is kept still;
when the pushing piece rolls over the cutter returning section, the wire cutting cam pushes the driving main rod to swing through the pushing piece, and the driving main rod drives the wire cutting assembly to execute cutter returning action.
Compared with the background art, the sewing machine provided by the invention comprises a thread cutting assembly, a driving main rod and a thread cutting cam, wherein the thread cutting assembly comprises a thread cutting elastic piece, one end of the thread cutting elastic piece is fixed, the other end of the thread cutting elastic piece is connected with the driving main rod, and one end of the driving main rod is rotatably arranged, and the other end of the driving main rod is hinged with the thread cutting assembly. The pushing piece of the driving main rod is propped against the thread cutting cam which is arranged on the lower shaft. The side of the thread cutting cam is provided with a U-shaped rail groove, and the U-shaped rail groove is formed by sequentially connecting a cutter outlet section, a holding section and a cutter returning section.
When the lower shaft rotates, the wire cutting cam synchronously rotates along with the lower shaft, and the wire cutting cam rotates relative to the pushing piece. When the pushing piece rolls over the cutter outlet section, the wire shearing elastic piece of the wire shearing assembly drives the main rod to swing through contraction and pulling, and the main rod is driven to drive the wire shearing assembly to execute cutter outlet action; when the pushing piece rolls over the holding section, the wire cutting assembly is kept still; when the pushing piece rolls over the cutter return section, the wire cutting cam pushes the driving main rod to swing through the pushing piece, and the driving main rod drives the wire cutting assembly to execute cutter return action, so that the wire cutting assembly realizes continuous wire cutting.
According to the thread cutting mechanism, the thread cutting assembly performs the cutting action by means of the elastic force of the thread cutting elastic piece, and then performs the cutting action by means of the driving force applied to the thread cutting cam by the lower shaft, the power provided by the lower shaft is large, the thread is easy to cut, the thread cutting elastic piece can be effectively prevented from being clamped, the risk of thread cutting faults of the thread cutting assembly is reduced, and the work reliability of the thread cutting mechanism is improved.
The thread cutting method of the sewing machine has the same beneficial effects.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a thread cutting mechanism of a conventional sewing machine;
FIG. 2 is a partial block diagram of a sewing machine according to an embodiment of the present invention;
FIG. 3 is an exploded view of FIG. 2;
FIG. 4 is a block diagram of the thread cutting cam of FIG. 2;
fig. 5 is a structural view of the limit cam of fig. 2.
the wire cutting assembly 1, the driving main rod 2, the wire cutting cam 3, the presser foot lifting assembly 4, the eccentric driving assembly 5, the abutting rod group 6 and the limiting assembly 7;
a length adjusting link 11, a right thread cutting lever 12, a right thread cutting link 13, a left thread cutting link 14 and a left thread cutting lever 15, a thread cutting elastic member 16 and a fixing column 17;
the pushing piece 21, the main rod shaft bracket 22 and the supporting rotating shaft 23;
a non-shear segment 31, a blade-out segment 32, a holding segment 33 and a blade-back segment 34;
the presser foot lifting roller 41, the presser foot lifting lever 42, the knee control connecting rod 43, the presser foot lifting connecting rod 44, the presser bar anchor 45, the presser bar 46 and the presser foot 47;
a driving motor 51, a driving rotating shaft 52, a presser foot lifting cam 53 and a limit cam 54;
a limit section 541 and a shear groove 542;
a limit swing rod 61 and a limit connecting rod 62;
the device comprises a limiting roller 71, a driving swing rod 72, a middle connecting rod 73 and a driven swing rod 74.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that those skilled in the art will better understand the present invention, the following description will be given in detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 2 to 5, fig. 2 is a partial structure diagram of a sewing machine according to an embodiment of the present invention; FIG. 3 is an exploded view of FIG. 2; FIG. 4 is a block diagram of the thread cutting cam of FIG. 2; fig. 5 is a structural view of the limit cam of fig. 2.
It should be noted that, based on the current view of fig. 3, the forward direction refers to the counterclockwise direction, and the reverse direction refers to the clockwise direction.
The embodiment of the invention discloses a sewing machine, which has the key improvement point that the structure of a thread cutting mechanism is optimized, so that a thread cutting assembly realizes a cutter return by virtue of a driving force provided by a lower shaft, thereby avoiding unsmooth thread cutting and having higher working reliability.
The sewing machine provided by the invention comprises a thread cutting assembly 1, a driving main rod 2 and a thread cutting cam 3, wherein the thread cutting assembly 1 is used for executing thread cutting action, and the structure and the working principle of the thread cutting assembly 1 can be referred to as follows.
One end of the driving main rod 2 is rotatably arranged, and the other end is hinged with the wire cutting assembly 1. The one end that drive mobile jib 2 kept away from cutting line subassembly 1 is equipped with mobile jib pedestal 22, and mobile jib pedestal 22 relies on fastening screw to fix on the casing, is fixed with on the mobile jib pedestal 22 to be equipped with and supports pivot 23, and drive mobile jib 2 corresponds to be equipped with and supports the cover, supports pivot 23 and supports the nested cooperation of cover, makes support pivot 23 support drive mobile jib 2 for mobile jib pedestal 22 rotates.
The thread cutting assembly 1 comprises a thread cutting elastic piece 16, one end of the thread cutting elastic piece 16 is fixed, and the other end of the thread cutting elastic piece is connected with the driving main rod 2. The housing is provided with a fixing post 17 for fixing the thread cutting elastic member 16. The wire cutting elastic member 16 is embodied as a cylindrical spring. The wire cutting elastic member 16 is indirectly connected to the driving boom 2 in a manner specifically described below.
The driving main rod 2 is provided with a pushing piece 21, the driving main rod 2 is integrally provided with a fixed pin shaft, and the pushing piece 21 is sleeved on the fixed pin shaft so that the pushing piece 21 rotates relative to the driving main rod 2. The center line of the pushing piece 21 is perpendicular to the center line of the wire cutting cam 3, so that the pushing piece 21 can rotate along the end face of the wire cutting cam 3. The pushing member 21 may be a roller or a pin, which is not particularly limited herein.
The pushing piece 21 is propped against the wire cutting cam 3, the wire cutting cam 3 is fixedly sleeved on the lower shaft, so that the wire cutting cam 3 synchronously rotates along with the lower shaft, and the pushing piece 21 rolls on the wire cutting cam 3 along a preset track. The end face of the thread cutting cam 3 is provided with a non-cutting segment 31, the side face of the thread cutting cam 3 is provided with a U-shaped rail groove, and two ends of the U-shaped rail groove are respectively connected with the non-cutting segment 31. When the lower shaft rotates, the wire cutting cam 3 synchronously rotates along with the lower shaft, the pushing piece 21 is firstly propped against the non-cutting wire segment 31 on the end face of the wire cutting cam 3, the driving main rod 2 does not swing along the axial direction of the wire cutting cam 3, and the wire cutting assembly 1 does not act.
The U-shaped rail groove is formed by sequentially connecting a cutter outlet section 32, a holding section 33 and a cutter return section 34, and the preset track is formed by a non-shearing section 31, the cutter outlet section 32, the holding section 33 and the cutter return section 34. The thread cutting cam 3 is cylindrical.
The wire cutting cam 3 continuously rotates along with the lower shaft, the pushing piece 21 rolls from the non-cutting section 31 to the U-shaped rail groove, so that the pushing piece 21 rolls through the cutter outlet section 32, the holding section 33 and the cutter return section 34 in sequence, and the cutter outlet section 32 and the cutter return section 34 are obliquely extended along the axial direction of the wire cutting cam 3, are symmetrically arranged and have the same length. The holding section 33 extends in the axial direction of the wire cutting cam 3.
Based on the current view of fig. 3, when the pushing piece 21 rolls over the cutter outlet section 32, the wire cutting elastic piece 16 pulls the driving main rod 2 to swing through contraction, one end of the driving main rod 2 close to the wire cutting assembly 1 swings anticlockwise, the driving main rod 2 drives the wire cutting assembly 1 to swing anticlockwise, the right moving cutter shaft and the left moving cutter shaft swing anticlockwise synchronously, and the driving main rod 2 drives the wire cutting assembly 1 to execute cutter outlet action; when the pushing piece 21 rolls over the holding section 33, one end of the driving main rod 2, which is close to the wire cutting assembly 1, does not swing, and the wire cutting assembly 1 is kept still; when the pushing piece 21 rolls over the cutter return section 34, the wire cutting cam 3 pushes the driving main rod 2 to swing through the pushing piece 21, one end, close to the wire cutting assembly 1, of the driving main rod 2 swings clockwise, the driving main rod 2 drives the wire cutting assembly 1 to swing clockwise, and the wire cutting assembly 1 executes cutter return action. The three actions of the knife-out action, the knife-keeping action and the knife-returning action are continuously carried out, and the line cutting assembly 1 can cut lines.
In summary, the thread cutting assembly 1 performs the cutting action by the elastic force of the thread cutting elastic member 16, and then performs the returning action by the driving force applied to the thread cutting cam 3 by the lower shaft, the power provided by the lower shaft is relatively large, the thread is easily cut, the thread cutting elastic member 16 is effectively prevented from being blocked, and the risk of thread cutting failure of the thread cutting assembly 1 is reduced, so that the sewing machine provided by the invention is beneficial to improving the working reliability of the thread cutting mechanism.
The invention further comprises a presser foot lifting assembly 4, an eccentric driving assembly 5, a supporting rod group 6 and a limiting assembly 7, and the structure and the working principle of the four assemblies can be referred to as follows. The presser foot lifting assembly 4 is used for realizing the action of lifting the presser foot. The eccentric driving assembly 5 is used for driving the presser foot lifting assembly 4 and the limiting assembly 7 simultaneously. The abutting rod group 6 is hinged with the driving main rod 2, and the limiting component 7 is arranged between the eccentric driving component 5 and the abutting rod group 6.
When the eccentric driving assembly 5 drives the presser foot lifting assembly 4 to execute the presser foot lifting action, the eccentric driving assembly 5 drives the limiting assembly 7 to prop against the abutting rod group 6, so that the limiting assembly 7 limits the swinging angle of the driving main rod 2 by means of the abutting rod group 6, the pushing piece 21 is prevented from propping against the U-shaped rail groove, the pushing piece 21 only rolls along the end face of the thread cutting cam 3, the pushing piece 21 props against the non-shearing segment 31, the driving main rod 2 does not swing, the thread cutting assembly 1 does not act, namely the presser foot 47 is lifted, threads are not sheared, and the mutual interference between the presser foot lifting action and the thread cutting action is avoided.
When the eccentric driving assembly 5 drives the limiting assembly 7 to act, the limiting assembly 7 is far away from the abutting rod group 6, the limiting assembly 7 is released from limitation, when the wire cutting cam 3 rotates along with the lower shaft, the pushing piece 21 alternately rolls between the end face of the wire cutting cam 3 and the U-shaped rail groove, the wire cutting assembly 1 executes the wire cutting action as required, and the wire cutting assembly 1 is effectively prevented from continuously and circularly executing the wire cutting action due to the fact that the lower shaft drives the wire cutting cam 3 to continuously rotate. When the limiting component 7 is far away from the abutting rod group 6, the presser foot lifting component 4 does not act, namely the presser foot 47 is not lifted when the wire is cut. When the distance between the limiting component 7 and the abutting rod group 6 reaches the maximum, the eccentric driving component 5 stops rotating.
Obviously, the eccentric driving assembly 5 only controls whether the wire cutting assembly 1 executes the wire cutting action or not, and does not directly drive the wire cutting assembly 1 to cut wires, so that a set of power source can be omitted, the structure is simpler, the power consumption is reduced, the low-power motor is conveniently used for replacing the high-power motor, and the cost is further reduced.
The eccentric drive assembly 5 includes a drive shaft 52, a presser foot lifting cam 53, and a limit cam 54. The presser foot lifting cam 53 and the limit cam 54 are coaxially and fixedly sleeved on the driving rotating shaft 52, so that the presser foot lifting cam 53 and the limit cam 54 synchronously rotate along with the driving rotating shaft 52. Correspondingly, the presser foot lifting assembly 4 comprises a presser foot lifting roller 41, and the presser foot lifting cam 53 is abutted against the presser foot lifting roller 41; the limiting assembly 7 comprises a limiting roller 71, and the limiting cam 54 abuts against the limiting roller 71.
Specifically, the outer contour of the presser foot lifting cam 53 is formed by smoothly connecting a semicircular contour and a half crescent contour. The limit cam 54 is cylindrical, one end of the limit cam 54 is provided with a shearing groove 542, and the groove edge of the shearing groove 542 is smoothly connected with the end surface of the limit cam 54. The outer side surfaces of the presser foot lifting roller 41 and the limit roller 71 are cylindrical, so that abrasion is reduced.
When the driving rotating shaft 52 rotates positively by a first preset angle, the driving rotating shaft 52 drives the presser foot lifting cam 53 to synchronously rotate by the first preset angle, the presser foot lifting roller 41 rolls from the lowest point to the highest point of the presser foot lifting cam 53, and the presser foot lifting assembly 4 executes the presser foot lifting action; meanwhile, the driving rotating shaft 52 drives the limit cam 54 to synchronously rotate by a first preset rotation angle, the limit roller 71 rolls along the end face of the limit cam 54 from the initial position, the limit roller 71 is propped against the limit section 541 of the end face of the limit cam 54, the limit roller 71 swings anticlockwise, the limit assembly 7 is propped against the propping rod group 6, the limit assembly 7 limits the driving main rod 2 to swing, and the wire cutting assembly 1 does not act.
It should be noted that, considering that the presser foot lifting operation can be performed only by the presser foot lifting assembly 4 when the limit roller 71 abuts against the limit section 541, the limit section 541 on the end surface of the limit cam 54 may be designed to have a longer length, so that the limit cam 54 has a sufficient rotation angle, and further, the lifting height of the presser foot lifting assembly 47 is ensured to be sufficiently large. In addition, the lifting height of the presser foot 47 can be correspondingly controlled by controlling the rotation angle of the driving rotating shaft 52, so that actions such as halfway presser foot lifting and micro presser foot lifting can be conveniently realized.
When the driving rotating shaft 52 reversely rotates by a second preset rotation angle, the driving rotating shaft 52 drives the presser foot lifting cam 53 to synchronously rotate by the second preset rotation angle, the presser foot lifting roller 41 rolls along the arc surface of the presser foot lifting cam 53, the height of the presser foot lifting roller 41 in the radial direction is unchanged, and the presser foot lifting assembly 4 does not act; meanwhile, the driving rotating shaft 52 drives the limit cam 54 to synchronously rotate by a second preset rotation angle, the limit roller 71 rolls into the wire cutting groove 542 from the limit section 541, the limit roller 71 swings clockwise around the hinge point, the limit assembly 7 swings clockwise integrally, the limit assembly 7 is far away from the abutting rod group 6, the limit assembly 7 releases the limit, and the wire cutting assembly 1 periodically and circularly executes the wire cutting action. When the limit roller 71 falls into the shearing groove 542, the rotation of the driving shaft 52 is stopped when the distance between the limit assembly 7 and the abutting rod set 6 reaches the maximum.
The first preset corner and the second preset corner can be set according to actual design parameters, and the first preset corner can be larger than the second preset corner.
It should be noted that, when the wire cutting is started, the limit cam 54 needs to rotate when the pushing member 21 rolls along the non-cutting wire segment 31, so that the limit roller 71 rolls from the limit segment 541 to the wire cutting slot 542, and the limit cam 54 is unseated; after the thread cutting operation is completed, the limit cam 54 rotates in the opposite direction, so that the limit roller 71 returns to the limit section 541 from the thread cutting slot 542; therefore, the operation period of the limit cam 54 must be within the period in which the wire cutting roller 21 rolls along the non-cutting wire segment 31.
The limiting assembly 7 comprises a driving swing rod 72, a driven swing rod 74 and a middle connecting rod 73, wherein the limiting roller 71 is rotatably arranged on one side of the driving swing rod 72, which is close to the limiting cam 54, and the top end of the driving swing rod 72 is hinged to the machine shell. The middle connecting rod 73 is hinged between the driving swing rod 72 and the driven swing rod 74, when the limiting roller 71 moves along the axial direction of the limiting cam 54, the limiting roller 71 drives the driving swing rod 72 to swing along the axial direction of the limiting cam 54 around the hinge point, so that the limiting swing rod 61 drives the driven swing rod 74 to swing relative to the abutting rod group 6 through the middle connecting rod 73, and the driven swing rod 74 is close to or far away from the abutting rod group 6. The driven swing link 74 is specifically a long swing link, and the middle section of the driven swing link 74 is hinged to the casing by a pin shaft.
The abutting rod group 6 comprises a limiting swing rod 61 and a limiting connecting rod 62, the limiting swing rod 61 and the driven swing rod 74 are oppositely arranged, and the limiting connecting rod 62 is hinged between the limiting swing rod 61 and the driving main rod 2. The limit swing rod 61 is specifically a short connecting rod.
When the limit roller 71 rolls from the shearing groove 542 to the limit section 541, the limit roller 71 drives the driving swing rod 72 to swing anticlockwise around the hinge point, the limit swing rod 61 drives the driven swing rod 74 to swing anticlockwise around the hinge point through the intermediate connecting rod 73 until the driven swing rod 74 abuts against the limit swing rod 61, and the limit assembly 7 plays a limit role.
When the limit roller 71 rolls down into the shearing groove 542 from the limit section 541, the limit roller 71 drives the driving swing rod 72 to swing clockwise around the hinge point, the limit swing rod 61 drives the driven swing rod 74 to swing clockwise around the hinge point through the middle connecting rod 73, the driven swing rod 74 is far away from the limit swing rod 61, and the limit assembly 7 releases the limit.
The wire cutting assembly 1 comprises a length adjusting connecting rod 11 and a right wire cutting lever 12, wherein the length adjusting connecting rod 11 is hinged with the driving main rod 2 through a pivot shaft. The right wire cutting lever 12 is hinged with one end of the length adjusting connecting rod 11 far away from the driving main rod 2. The wire cutting assembly 1 further comprises a right wire cutting connecting rod 13, a left wire cutting connecting rod 14 and a left wire cutting lever 15, wherein the right wire cutting connecting rod 13 is fixedly connected with the left wire cutting connecting rod 14, the right wire cutting connecting rod 13 is hinged with the right wire cutting lever 12, and the left wire cutting connecting rod 14 is hinged with the left wire cutting lever 15. When the main rod 2 is driven to swing, the main rod 2 is driven to swing by the right trimming lever 12 through the length adjusting connecting rod 11, the right trimming lever 12 drives the left trimming lever 15 to swing synchronously by the right trimming connecting rod 13 and the left trimming connecting rod 14, so that the right moving cutter shaft and the left moving cutter shaft rotate synchronously, and further the right moving cutter and the left moving cutter move simultaneously, and the simultaneous trimming is realized.
It is critical that the movable end of the wire cutting spring 16, i.e. the end remote from the housing, is fixedly connected to the pivot shaft. When the pushing piece 21 rolls over the cutter outlet section 32, the wire cutting elastic piece 16 swings by shrinking and pulling the length adjusting connecting rod 11, the right wire cutting lever 12 and the driving main rod 2 synchronously swing forward along with the length adjusting connecting rod 11, the right wire cutting lever 12 executes the cutter outlet action, and the right wire cutting lever 12 drives the left wire cutting lever 15 to synchronously execute the cutter outlet action; when the pushing piece 21 rolls over the cutter return section 34, the thread cutting cam 3 overcomes the elastic force of the thread cutting elastic piece 16 to push the driving main rod 2 to swing, at the moment, the thread cutting elastic piece 16 is stretched, the driving main rod 2 drives the length adjusting connecting rod 11 to swing reversely synchronously with the right thread cutting lever 12, the right thread cutting lever 12 executes the cutter return action, and the right thread cutting lever 12 drives the left thread cutting lever 15 to synchronously execute the cutter return action.
As can be seen from the above description, the wire cutting elastic member 16 can drive the wire cutting assembly 1 to perform the wire cutting action, and the wire cutting elastic member 16 can also keep the pushing member 21 in contact with the wire cutting cam 3 all the time, so that the pushing member 21 moves along the preset track of the wire cutting cam 3, otherwise, the pushing member 21 may jump and not follow the track.
The presser foot lifting assembly 4 comprises a presser foot lifting lever 42, a knee control connecting rod 43, a presser foot lifting connecting rod 44, a pressure lever hoop 45, a pressure lever 46 and a presser foot 47, wherein the presser foot lifting lever 42 is provided with a presser foot lifting roller 41, the presser foot lifting lever 42 is in an L shape, and the middle section of the presser foot lifting lever 42 is hinged on the machine shell. The knee control link 43 is connected between the presser foot lifting lever 42 and the presser foot lifting lever 47, and the middle section of the presser foot lifting link 44 is also hinged to the casing. The pressure bar hoop 45 is fixedly sleeved on the pressure bar 46, and the presser foot 47 is fixedly arranged at the bottom of the pressure bar 46.
When the presser foot lifting roller 41 rolls from the lowest point to the highest point of the presser foot lifting cam 53, the presser foot lifting roller 41 moves upwards along the radial direction of the driving rotating shaft 52, the presser foot lifting roller 41 drives the presser foot lifting lever 42 to rotate clockwise, the presser foot lifting lever 42 drives the presser foot lifting connecting rod 44 to rotate anticlockwise through the knee control connecting rod 43, the presser foot lifting connecting rod 44 pushes the presser bar hoop 45 to move upwards, the presser bar 46 drives the presser foot 47 to move upwards, and the presser foot 47 is lifted.
In addition, the eccentric driving assembly 5 includes a driving motor 51 fixedly connected to a driving shaft 52, and an output shaft of the driving motor 51 is coaxially connected to the driving shaft 52. The drive motor 51 may be a servo motor in particular. The driving motor 51 is fixedly arranged on the rear window plate, so that the driving motor 51 is far away from the oil pan, oil mist generated by the oil pan is prevented from corroding the driving motor 51, and the service life of the driving motor 51 is prolonged.
In order to improve the control precision, the invention also comprises a controller which is connected with the driving motor 51, when the controller receives the instruction of lifting the presser foot 47, the controller controls the driving motor 51 to automatically rotate a first preset rotation angle from the initial preset rotation angle forward direction, so that the presser foot lifting assembly 4 automatically executes the presser foot lifting action. The initial preset rotation angle refers to a rotation angle corresponding to the time when the driving motor 51 does not cut a wire or lift the presser foot 47.
The present invention further includes a rotation angle detecting member for detecting a rotation angle of the driving motor 51, and the rotation angle detecting member is connected to the controller, and the rotation angle detecting member may be a rotary encoder provided to the driving motor 51, but is not limited thereto. When the rotation angle detecting member detects that the driving motor 51 rotates forward by a first preset rotation angle, the controller controls the driving motor 51 to rotate reversely according to the signal fed back by the rotation angle detecting member until the rotation angle is restored to the initial preset rotation angle, and the presser foot 47 automatically falls down.
When the controller receives a wire cutting instruction, the controller controls the driving motor 51 to reversely rotate by a second preset rotation angle from the initial preset rotation angle, the limiting assembly 7 releases the limit, and the wire cutting assembly 1 automatically executes the wire cutting action. When the angle detecting member detects that the driving motor 51 reversely rotates by a second preset angle, the controller controls the driving motor 51 to automatically stop according to the signal fed back by the angle detecting member.
The thread trimming method of the sewing machine provided by the invention is applied to the sewing machine, and comprises the following steps:
the first step, the wire cutting cam 3 synchronously rotates along with the lower shaft, and the wire cutting cam 3 rotates relative to the pushing piece 21 of the driving main rod 2;
the second step, the pushing piece 21 sequentially rolls through a U-shaped rail groove formed by sequentially connecting a cutter outlet section 32, a holding section 33 and a cutter returning section 34;
when the pushing piece 21 rolls over the cutter outlet section 32, the wire cutting elastic piece 16 of the wire cutting assembly 1 pulls the driving main rod 2 to swing through contraction, and the driving main rod 2 drives the wire cutting assembly 1 to execute cutter outlet action;
the wire cutting assembly 1 remains stationary as the ejector 21 rolls over the holding section 33;
when the pushing piece 21 rolls over the cutter return section 34, the wire cutting cam 3 pushes the driving main rod 2 to swing through the pushing piece 21, and the driving main rod 2 drives the wire cutting assembly 1 to execute cutter return action.
Specifically, when the driving motor 51 rotates forward by a first preset angle, the driving shaft 52 drives the presser foot lifting cam 53 to synchronously rotate by the first preset angle, the presser foot lifting roller 41 rolls from the lowest point of the presser foot lifting cam 53 to the highest point, the presser foot lifting roller 41 moves upwards along the radial direction of the driving shaft 52, the presser foot lifting roller 41 drives the presser foot lifting lever 42 to rotate clockwise, the presser foot lifting lever 42 drives the presser foot lifting link 44 to rotate anticlockwise through the knee control link 43, the presser foot lifting link 44 pushes the presser bar hoop 45 to move upwards, and the presser bar 46 drives the presser foot 47 to move upwards, so that the presser foot 47 is lifted; meanwhile, the driving rotating shaft 52 drives the limit cam 54 to synchronously rotate by a first preset rotation angle, the limit roller 71 rolls along the end face of the limit cam 54 from the initial position, the limit component 7 limits the driving main rod 2 to swing, the pushing component 21 rolls along the non-shearing segment 31 of the shearing cam 3, the driving main rod 2 does not swing, and the shearing component 1 does not act;
the driving motor 51 reversely rotates by a second preset rotation angle, the driving rotating shaft 52 drives the presser foot lifting cam 53 to synchronously rotate by the second preset rotation angle, the presser foot lifting roller 41 rolls along the arc surface of the presser foot lifting cam 53, the height of the presser foot lifting roller 41 is unchanged, and the presser foot lifting assembly 4 does not act; meanwhile, the driving rotating shaft 52 drives the limit cam 54 to synchronously rotate by a second preset rotation angle, the driving rotating shaft 52 drives the limit cam 54 to synchronously rotate by the second preset rotation angle, the limit roller 71 rolls into the shearing groove 542 from the limit section 541, the limit roller 71 swings clockwise, the limit swinging rod 61 drives the driven swinging rod 74 to swing clockwise through the middle connecting rod 73, the driven swinging rod 74 is far away from the limit swinging rod 61, and the limit component 7 releases limit; the wire cutting cam 3 synchronously rotates along with the lower shaft, and when the pushing piece 21 is propped against the non-cutting wire segment 31 of the wire cutting cam 3, the driving main rod 2 does not swing, and the wire cutting assembly 1 does not act; when the pushing piece 21 rolls over the cutter outlet section 32, the main rod 2 is driven to swing anticlockwise, the main rod 2 is driven to drive the right wire cutting lever 12 to swing anticlockwise through the length adjusting connecting rod 11, the right wire cutting lever 12 drives the left wire cutting lever 15 to swing anticlockwise synchronously through the right wire cutting connecting rod 13 and the left wire cutting connecting rod 14, so that the right movable cutter shaft and the left movable cutter shaft rotate synchronously, and cutter outlet action is executed; when the pushing piece 21 rolls over the holding section 33, the driving main rod 2 does not swing, and the wire cutting assembly 1 is kept still; when the pushing piece 21 rolls over the cutter return section 34, one end, close to the wire cutting assembly 1, of the driving main rod 2 is clockwise swung, the driving main rod 2 drives the right wire cutting lever 12 to clockwise swung through the length adjusting connecting rod 11, the right wire cutting lever 12 drives the left wire cutting lever 15 to synchronously clockwise swung, so that the right moving cutter shaft and the left moving cutter shaft synchronously rotate, and cutter return action is executed; thereby completing the thread cutting action.
After the wire cutting is completed, the driving motor 51 rotates forward again, the driving rotating shaft 52 drives the limit cam 54 to rotate synchronously, the limit roller 71 rolls from the wire cutting groove 542 to the limit section 541 of the limit cam 54, the limit roller 71 drives the driving swing rod 72 to swing anticlockwise, the limit swing rod 61 drives the driven swing rod 74 to swing anticlockwise through the middle connecting rod 73 until the driven swing rod 74 abuts against the limit swing rod 61, the limit assembly 7 limits the swing angle of the driving main rod 2, the driving main rod 2 prevents the pushing piece 21 from abutting against the U-shaped rail groove, and the pushing piece 21 rolls along the non-cutting section 31 of the wire cutting cam 3.
The sewing machine provided by the invention has been described in detail, and specific examples are employed herein to illustrate the principles and embodiments of the invention, the above examples being provided only to assist in understanding the method of the invention and its core ideas; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (12)
1. A sewing machine, comprising:
a wire cutting assembly (1);
a driving main rod (2) with one end rotatably arranged and the other end hinged with the wire cutting assembly (1); the wire cutting assembly (1) comprises a wire cutting elastic piece (16) with one end fixed and the other end connected with the driving main rod (2);
a wire cutting cam (3) which is propped against the pushing piece (21) of the driving main rod (2) and is used for synchronously rotating along with the lower shaft; the side surface of the thread cutting cam (3) is provided with a U-shaped rail groove formed by sequentially connecting a cutter outlet section (32), a holding section (33) and a cutter returning section (34);
when the pushing piece (21) rolls over the cutter outlet section (32), the wire cutting elastic piece (16) pulls the driving main rod (2) to swing through shrinkage, and the driving main rod (2) drives the wire cutting assembly (1) to execute cutter outlet action;
the wire cutting assembly (1) remains stationary while the ejector (21) rolls over the holding section (33);
when the pushing piece (21) rolls over the cutter return section (34), the wire cutting cam (3) pushes the driving main rod (2) to swing through the pushing piece (21), and the driving main rod (2) drives the wire cutting assembly (1) to execute cutter return action.
2. The sewing machine of claim 1, wherein both ends of the U-shaped rail groove are respectively connected with a non-cutting segment (31) provided on an end surface of the cutting cam (3), and the cutting assembly (1) does not act when the pushing member (21) rolls over the non-cutting segment (31).
3. The sewing machine of claim 1, further comprising:
a presser foot lifting assembly (4);
an eccentric drive assembly (5);
a butt joint rod group (6) hinged with the driving main rod (2);
the limiting assembly (7) is arranged between the eccentric driving assembly (5) and the abutting rod group (6);
when the eccentric driving assembly (5) drives the presser foot lifting assembly (4) to execute the presser foot lifting action, the limiting assembly (7) is abutted against the abutting rod group (6) to prevent the pushing piece (21) from being abutted against the U-shaped rail groove;
when the eccentric driving assembly (5) drives the limiting assembly (7) to be far away from the abutting rod group (6) so as to release the limitation, the presser foot lifting assembly (4) does not act.
4. A sewing machine according to claim 3, wherein the presser foot lifting assembly (4) comprises a presser foot lifting roller (41), the limiting assembly (7) comprises a limiting roller (71), and the eccentric drive assembly (5) comprises:
a drive spindle (52);
the presser foot lifting cam (53) and the limit cam (54) are coaxially and fixedly arranged on the driving rotating shaft (52); the presser foot lifting cam (53) is propped against the presser foot lifting roller (41), and the limit cam (54) is propped against the limit roller (71);
when the driving rotating shaft (52) rotates positively by a first preset rotation angle, the presser foot lifting cam (53) jacks up the presser foot lifting roller (41) to enable the presser foot lifting assembly (4) to execute a presser foot lifting action, and the limiting roller (71) is abutted against a limiting section (541) of the end face of the limiting cam (54) to enable the limiting assembly (7) to be abutted against the abutting rod group (6);
when the driving rotating shaft (52) reversely rotates by a second preset rotation angle, the limiting roller (71) falls into a shearing groove (542) arranged on the side surface of the limiting cam (54) so that the limiting assembly (7) is far away from the abutting rod group (6).
5. The sewing machine of claim 4, wherein the limit assembly (7) further comprises a driving swing link (72) with one end rotatably provided with the limit roller (71), a driven swing link (74) and an intermediate connecting rod (73) hinged between the driving swing link (72) and the driven swing link (74); the abutting rod group (6) comprises a limiting swing rod (61) arranged opposite to the driven swing rod (74) and a limiting connecting rod (62) hinged between the limiting swing rod (61) and the driving main rod (2);
when the limit roller (71) rolls from a shearing groove (542) arranged on the side surface of the limit cam (54) to a limit section (541) on the end surface of the limit cam (54), the driven swing rod (74) is abutted against the limit swing rod (61);
when the limit roller (71) falls into the shearing groove (542), the driven swing rod (74) is far away from the limit swing rod (61).
6. Sewing machine according to any of claims 1 to 5, characterized in that the thread cutting assembly (1) comprises:
a length adjusting connecting rod (11) hinged with the driving main rod (2);
a right thread cutting lever (12) hinged with the length adjusting connecting rod (11) through a pivot shaft, wherein the movable end of the thread cutting elastic piece (16) is fixedly connected with the pivot shaft;
when the pushing piece (21) rolls over the cutter outlet section (32), the wire cutting elastic piece (16) pulls the length adjusting connecting rod (11) to swing through contraction so that the right wire cutting lever (12) and the driving main rod (2) synchronously and positively swing along with the length adjusting connecting rod (11), and the right wire cutting lever (12) realizes cutter outlet;
when the pushing piece (21) rolls over the cutter return section (34), the thread cutting cam (3) overcomes the elastic force of the thread cutting elastic piece (16) to push the driving main rod (2) to swing so that the driving main rod (2) drives the length adjusting connecting rod (11) to swing reversely with the right thread cutting lever (12) synchronously, and the right thread cutting lever (12) realizes cutter return.
7. Sewing machine according to claim 4, characterized in that the presser foot lifting assembly (4) comprises:
a presser foot lifting lever (42) provided with the presser foot lifting roller (41);
a presser foot lifting connecting rod (44);
a knee control link (43) connected between the presser foot lifting lever (42) and the presser foot lifting link (44);
a compression bar (46) provided with a compression bar hoop (45);
when the highest point of the presser foot lifting cam (53) is propped against the presser foot lifting roller (41), the presser foot lifting connecting rod (44) lifts the pressing rod (46) through the pressing rod hoop (45).
8. A sewing machine according to claim 4, characterized in that the eccentric drive assembly (5) comprises a drive motor (51) fixedly connected to the drive shaft (52), the drive motor (51) being mounted to the back window panel.
9. The sewing machine of claim 8, further comprising a controller coupled to the drive motor (51), the controller controlling the drive motor (51) to rotate forward by the first preset angle from an initial preset angle in response to the received presser foot lift command.
10. The sewing machine of claim 9, further comprising a rotation angle detecting member connected to the controller for detecting a rotation angle of the driving motor (51); when the rotation angle detection part detects that the driving motor (51) rotates forwards by the first preset rotation angle, the controller controls the driving motor (51) to rotate reversely according to the signal fed back by the rotation angle detection part until the rotation angle is recovered to the initial preset rotation angle.
11. The sewing machine of claim 10, wherein the controller controls the driving motor (51) to reversely rotate the second preset rotation angle from the initial preset rotation angle according to the received thread cutting command, and when the rotation angle detecting member detects that the driving motor (51) reversely rotates the second preset rotation angle, the controller controls the driving motor (51) to stop according to a signal fed back by the rotation angle detecting member.
12. A thread cutting method for a sewing machine, characterized by being applied to the sewing machine of any one of the above claims 1 to 11, comprising the steps of:
the thread cutting cam (3) synchronously rotates along with the lower shaft;
the pushing piece (21) of the driving main rod (2) sequentially rolls through a U-shaped rail groove formed by sequentially connecting a cutter outlet section (32), a holding section (33) and a cutter returning section (34);
when the pushing piece (21) rolls over the cutter outlet section (32), the wire cutting elastic piece (16) of the wire cutting assembly (1) pulls the driving main rod (2) to swing through shrinkage, and the driving main rod (2) drives the wire cutting assembly (1) to execute cutter outlet action;
the wire cutting assembly (1) remains stationary while the ejector (21) rolls over the holding section (33);
when the pushing piece (21) rolls over the cutter return section (34), the wire cutting cam (3) pushes the driving main rod (2) to swing through the pushing piece (21), and the driving main rod (2) drives the wire cutting assembly (1) to execute cutter return action.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011641048.2A CN114687082B (en) | 2020-12-31 | 2020-12-31 | Sewing machine and thread cutting method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011641048.2A CN114687082B (en) | 2020-12-31 | 2020-12-31 | Sewing machine and thread cutting method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114687082A CN114687082A (en) | 2022-07-01 |
| CN114687082B true CN114687082B (en) | 2023-05-26 |
Family
ID=82135883
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011641048.2A Active CN114687082B (en) | 2020-12-31 | 2020-12-31 | Sewing machine and thread cutting method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114687082B (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5372079A (en) * | 1993-08-11 | 1994-12-13 | The Singer Company N.V. | Thread trimming device for a sewing machine |
| TWM365364U (en) * | 2009-03-12 | 2009-09-21 | Chee Siang Ind Co Ltd | Automatic thread-cutting device of sewing machine |
| CN106835526B (en) * | 2017-04-01 | 2019-08-30 | 杰克缝纫机股份有限公司 | A kind of novel thread cutting mechanism and sewing machine |
| CN106948103B (en) * | 2017-04-01 | 2019-12-17 | 杰克缝纫机股份有限公司 | Thread trimming device of sewing machine and sewing machine |
| CN109234929B (en) * | 2018-12-03 | 2024-04-09 | 美机科技集团有限公司 | Thread cutting mechanism of sewing machine and sewing machine |
| CN110878450B (en) * | 2019-12-23 | 2021-11-02 | 杰克缝纫机股份有限公司 | Sewing machine trimming lifting presser foot and presser foot pressure adjusting device and sewing machine |
| CN110923967B (en) * | 2019-12-23 | 2021-12-14 | 浙江杰克智能缝制科技有限公司 | Sewing machine trimming and thread loosening pressure foot lifting device and sewing machine |
| CN111979654A (en) * | 2020-09-30 | 2020-11-24 | 琦星智能科技股份有限公司 | Driving device for trimming, lifting presser foot and adjusting needle pitch in sewing machine |
-
2020
- 2020-12-31 CN CN202011641048.2A patent/CN114687082B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN114687082A (en) | 2022-07-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110923967B (en) | Sewing machine trimming and thread loosening pressure foot lifting device and sewing machine | |
| JPH1052167A (en) | Tool, especially pruning shears | |
| US9636762B2 (en) | Desk-top cutting machine | |
| CN109537194B (en) | Sewing machine and automatic presser foot lifting and thread cutting control method | |
| CN110219101A (en) | A kind of sewing machine and presser foot lifter thread releasing mechanism | |
| CN112170722B (en) | Oscillating welding wire shearing mechanism | |
| CN114687082B (en) | Sewing machine and thread cutting method thereof | |
| CN209144415U (en) | A kind of sewing machine and automatic shearing mechanism | |
| JPS6333999B2 (en) | ||
| CN208183275U (en) | A kind of sewing machine | |
| JP3682360B2 (en) | Sewing machine presser foot | |
| JP3980316B2 (en) | Lock control method and lock device for vehicle door | |
| CN114068205B (en) | Switch system for controlling switching of double-medical-treatment power switch | |
| CN114990794B (en) | Sewing machine with same motor for controlling pressure of presser foot, lifting presser foot and cutting thread | |
| CN214572639U (en) | Sewing machine and bobbin rotation preventing device thereof | |
| CN114990796B (en) | Sewing machine with same motor for controlling pressure of presser foot, lifting presser foot and cutting and loosening thread | |
| CN110042579A (en) | A kind of thread-trimming lifter-presser foot mechanism and sewing machine | |
| CN108118450B (en) | Buttonhole sewing machine | |
| CN108118469B (en) | Buttonhole sewing machine | |
| CN218540041U (en) | Single cam thread trimming and presser foot lifting driving mechanism of overedger | |
| CN213804305U (en) | Trimming and presser foot lifting integrated mechanism of overedger | |
| CN114990795B (en) | Sewing machine with same motor for controlling presser foot lifting and thread cutting and loosening | |
| CN219410155U (en) | Vertical-mounted thread cutting driving mechanism and flat seaming machine comprising same | |
| CN219137119U (en) | Improved roller car | |
| CN219410123U (en) | Presser foot mechanism |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |