CN113235231B - Thread trimming and presser foot lifting mechanism and overedger - Google Patents
Thread trimming and presser foot lifting mechanism and overedger Download PDFInfo
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- CN113235231B CN113235231B CN202110665092.5A CN202110665092A CN113235231B CN 113235231 B CN113235231 B CN 113235231B CN 202110665092 A CN202110665092 A CN 202110665092A CN 113235231 B CN113235231 B CN 113235231B
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- trimming
- presser foot
- thread
- foot lifting
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B29/00—Pressers; Presser feet
- D05B29/02—Presser-control devices
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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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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
- D05B69/10—Electrical or electromagnetic drives
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- Textile Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
The invention provides a thread trimming and presser foot lifting mechanism and a overedger, wherein the thread trimming and presser foot lifting mechanism comprises: the device comprises a driving device, a driving wheel, a thread trimming mechanism, a presser foot lifting mechanism and a resetting mechanism; the driving wheel is connected with the driving device, and the driving device drives the driving wheel to rotate; the thread cutting mechanism and the presser foot lifting mechanism are matched with the driving wheel, and the rotation of the driving wheel respectively controls the thread cutting mechanism to perform thread cutting action or controls the presser foot lifting mechanism to perform presser foot lifting action; when the driving wheel rotates forwards, the driving wheel drives the thread trimming mechanism to act, and the presser foot lifting mechanism does not act; when the driving wheel rotates reversely, the driving wheel drives the presser foot lifting mechanism to act, and the thread cutting mechanism does not act; the reset mechanism is used for resetting the driving wheel. The invention can respectively drive the wire cutting mechanism and the presser foot lifting mechanism to act by only one driving device through the transmission of the driving wheel, and has simple structure, compact layout and convenient assembly.
Description
The application is a divisional application of a patent application with the application date of 2019, 10 and 12 months and the application number of 201910969104.6 and the name of the invention is 'thread trimming and presser foot lifting mechanism and overedger'.
Technical Field
The invention relates to the technical field of sewing equipment, in particular to a thread trimming and presser foot lifting mechanism and a overedger.
Background
A sewing machine is a machine that uses a sewing thread to form one or more stitches on a sewn article to interlace or sew a plurality of layers of the sewn article. Sewing machines are classified into flat sewing machines, overlock sewing machines, flat sewing machines, and the like according to the purpose of sewing.
The overedger is generally provided with a thread cutting mechanism and a presser foot lifting mechanism, the existing overedger generally drives the thread cutting mechanism and the presser foot lifting mechanism to act respectively through two driving devices, such as two electromagnets, and the overedger has the disadvantages of more parts, complex structure and inconvenient assembly.
Disclosure of Invention
In view of the above, there is a need for an improved thread trimming and presser foot lifting mechanism and overedger that are simple in structure and easy to assemble.
The invention provides a thread trimming and presser foot lifting mechanism, which comprises: the device comprises a driving device, a driving wheel, a thread trimming mechanism and a presser foot lifting mechanism; the driving wheel is connected with the driving device, and the driving device drives the driving wheel to rotate; the thread cutting mechanism and the presser foot lifting mechanism are matched with the driving wheel, and the rotation of the driving wheel respectively controls the thread cutting mechanism to perform thread cutting action or controls the presser foot lifting mechanism to perform presser foot lifting action; when the driving wheel rotates forwards, the driving wheel drives the thread cutting mechanism to act, and the presser foot lifting mechanism does not act; when the driving wheel rotates reversely, the driving wheel drives the presser foot lifting mechanism to act, and the thread cutting mechanism does not act;
the driving wheel comprises a driving hole connected with the driving device, the driving wheel rotates by taking the driving hole as a rotation center, the driving wheel further comprises a driving part used for triggering the action of the thread cutting mechanism or the presser foot lifting mechanism, the thread cutting mechanism comprises a thread cutting triggering part, the presser foot lifting mechanism comprises a presser foot lifting triggering part, the thread cutting triggering part and the presser foot lifting triggering part are respectively arranged at two sides of the driving part, when the driving wheel rotates forwards, the driving part acts on the thread cutting triggering part to trigger the thread cutting mechanism to carry out thread cutting action, and at the moment, the presser foot lifting mechanism does not act; when the driving wheel rotates reversely until the driving part acts on the presser foot lifting triggering piece, the presser foot lifting mechanism is triggered to lift the presser foot, and the thread trimming mechanism does not act at the moment;
the thread trimming and presser foot lifting mechanism further comprises a base, and the driving device is fixedly arranged on the base;
the thread trimming mechanism further comprises: the wire cutting push rod, the elastic reset piece, the wire cutting connecting rod, the cutter shaft and the cutter are arranged on the wire cutting push rod;
the trimming push rod can be movably arranged on the base up and down;
the trimming trigger piece is arranged on the trimming push rod, and when the driving wheel rotates forwards, the driving wheel drives the trimming trigger piece to move upwards and lift the trimming push rod upwards;
the elastic resetting piece acts on the thread cutting push rod to reset the thread cutting push rod;
the middle part of the trimming connecting rod is hinged with the trimming push rod, one end of the trimming connecting rod is rotatably arranged on the base through a first rotating shaft, and when the trimming push rod moves up and down, the trimming push rod drives the trimming connecting rod to rotate by taking the first rotating shaft as a center;
the other end of the thread trimming connecting rod acts on one end of the cutter shaft so as to drive the cutter shaft to rotate in a direction opposite to the rotating direction of the thread trimming connecting rod through the rotation of the thread trimming connecting rod;
the knife is fixedly arranged at the other end of the knife shaft, and when the knife shaft rotates, the knife is driven to rotate to cut the thread.
In an embodiment of the present invention, the trimming trigger is a pulley rotatably mounted on the trimming push rod through a shaft screw.
In an embodiment of the present invention, two mounting arms are disposed at an upper end of the trimming push rod at an interval, the trimming connecting rod is inserted between the two mounting arms, a plug pin passes through the trimming connecting rod and the two mounting arms, and two ends of the plug pin are fixed to the two mounting arms through set screws.
In an embodiment of the present invention, the thread trimming mechanism further includes a shaft sleeve, the base is provided with a thread trimming mounting plate, the shaft sleeve is fixedly mounted on the thread trimming mounting plate, the thread trimming push rod is inserted into the shaft sleeve and can move up and down relative to the shaft sleeve, the length of the thread trimming push rod is greater than that of the shaft sleeve, and the elastic reset member is connected to the thread trimming mounting plate and the thread trimming push rod to reset the thread trimming push rod.
In an embodiment of the present invention, the thread trimming mechanism further includes a spacer and a lock nut, the lock nut is fixed to the lower end of the thread trimming push rod through a threaded fit, and fixes the spacer to the lower end of the thread trimming push rod, the elastic reset member is a spring, the spring is sleeved on the outer side of the shaft sleeve, and two ends of the spring are abutted between the thread trimming mounting plate and the spacer, so that the thread trimming push rod has a tendency of moving and resetting downward.
In an embodiment of the present invention, the thread trimming push rod includes a mounting portion and a rod portion, the mounting portion is located above the rod portion, a step is formed between the mounting portion and the rod portion, the rod portion is inserted into the shaft sleeve, the thread trimming mechanism further includes a buffer washer, and the buffer washer is sleeved outside the rod portion and is disposed between the mounting portion and the shaft sleeve.
In an embodiment of the present invention, the shaft sleeve is a bushing or a linear bearing with a smooth inner surface.
In an embodiment of the present invention, a shift lever is disposed at the other end of the thread trimming connecting rod, a crank is fixedly disposed at one end of the cutter shaft, the crank has a sliding slot, the shift lever is inserted into the sliding slot to be slidably engaged with the sliding slot, and when the thread trimming connecting rod rotates around the rotating shaft, the shift lever slides in the sliding slot to drive the crank to rotate around the cutter shaft and drive the cutter to rotate to perform a thread trimming operation.
In an embodiment of the invention, the driving device is a motor, the driving wheel further includes an idle stroke portion, the driving portion is connected to an edge of one side of the idle stroke portion, when the driving portion drives the trimming trigger to operate, the idle stroke portion is close to one side of the presser foot lifting trigger, and when the driving portion drives the presser foot lifting trigger to operate, the idle stroke portion is close to one side of the trimming trigger.
The invention also provides an overlock machine which comprises the thread trimming and presser foot lifting mechanism in any one of the embodiments.
According to the thread trimming and presser foot lifting mechanism and the overedger, the thread trimming mechanism and the presser foot lifting mechanism can be respectively driven to act only by one driving device through transmission of the driving wheel, and the overedger is simple in structure, compact in layout and convenient to assemble.
Drawings
FIG. 1 is a schematic structural diagram of an overlock machine according to an embodiment of the invention;
fig. 2 is a schematic structural view of a thread trimming and presser foot lifting mechanism according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a thread trimming mechanism of the thread trimming presser foot lifting mechanism according to an embodiment of the present invention;
FIG. 4 is an exploded view of FIG. 3;
fig. 5 is a partially exploded view of the presser foot lifting mechanism of the thread trimming presser foot lifting mechanism according to the embodiment of the present invention;
fig. 6 is a schematic structural diagram of a base plate of a trimming and presser foot lifting mechanism according to an embodiment of the present invention;
fig. 7 is a schematic structural view of a driving wheel of a thread trimming and presser foot lifting mechanism according to an embodiment of the present invention;
fig. 8 is a partial structural schematic view of a thread trimming and presser foot lifting mechanism according to another embodiment of the present invention.
Description of the main elements
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that when a mechanism is referred to as being "disposed on" another mechanism, it may be disposed directly on the other mechanism or there may be an intervening mechanism. When an entity is said to be "secured" to another entity, it may be directly secured to the other entity or intervening entities may be present. When an entity is said to be "mounted to" another entity, it may be directly mounted to the other entity or intervening entities may be present, and when an entity is said to be "coupled" to the other entity, it may be directly coupled to the other entity or intervening entities may be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 1, the present invention provides a thread trimming presser foot lifting mechanism, including: the device comprises a driving device 1, a driving wheel 2, a thread trimming mechanism 3 and a presser foot lifting mechanism 4.
The driving wheel 2 is connected with the driving device 1, and the driving device 1 drives the driving wheel 2 to rotate; the thread cutting mechanism 3 and the presser foot lifting mechanism 4 are matched with the driving wheel 2, and the rotation of the driving wheel 2 respectively controls the thread cutting mechanism 3 to perform thread cutting action or controls the presser foot lifting mechanism 4 to perform presser foot lifting action.
When the driving wheel 2 rotates forwards, the driving wheel 2 drives the thread trimming mechanism 3 to act, and the presser foot lifting mechanism 4 does not act; when the driving wheel 2 rotates reversely, the driving wheel 2 drives the presser foot lifting mechanism 4 to act, and the thread cutting mechanism 3 does not act. "forward" and "reverse" are two opposite directions, the "forward" can be clockwise or counterclockwise, and when the "forward" is clockwise, the "reverse" is counterclockwise; conversely, when "forward" is counterclockwise, "reverse" is clockwise.
The trimming and presser foot lifting mechanism provided by the embodiment can respectively drive the trimming mechanism 3 and the presser foot lifting mechanism 4 to act by only one driving device 1 through the transmission of the driving wheel 2, and has the advantages of simple structure, compact layout and convenience in assembly.
The driving device 1 can be connected with a control system, and the control system is internally provided with a control program, so that the thread cutting mechanism 3 and the presser foot lifting mechanism 4 are automatically controlled to respectively act through the control program.
The driving device 1 preferably adopts a stepping motor, and compared with an electromagnet as a power source, the motor has the advantages of small sound, sufficient power and the like during working. In other embodiments, the driving device 1 may also adopt a rotary cylinder.
Referring to fig. 1 and 5, an output shaft 11 of the driving device 1 is connected to the driving wheel 2, and the output shaft 11 rotates to drive the driving wheel 2 to rotate.
Further, referring to fig. 7, the driving wheel 2 includes a driving hole 201 connected to the driving device 1, and the driving wheel 2 rotates around the driving hole 201 as a rotation center. When assembling, the output shaft 11 of the driving device 1 is inserted into the driving hole 201, and the output shaft 11 and the driving wheel 2 are connected by a screw. For the convenience of assembly, the driving wheel 2 may be further provided with a mounting block 20 protruding toward one side, a driving hole 201 is provided on the mounting block 20, the output shaft 11 of the driving device 1 is inserted into the mounting block 20, and a screw is inserted into the mounting block 20 and the output shaft 11 from the side to fix the two together, which is more reliable.
Referring to fig. 1, 2, 5 and 7, the driving wheel 2 further includes a driving portion 21 for triggering the operation of the thread trimming mechanism 3 or the presser foot lifting mechanism 4. The thread cutting mechanism 3 comprises a thread cutting trigger 31, the presser foot lifting mechanism 4 comprises a presser foot lifting trigger 41, the thread cutting trigger 31 and the presser foot lifting trigger 32 are respectively arranged at two sides of the driving part 21, when the driving wheel 2 rotates in the forward direction, the driving part 21 acts on the thread cutting trigger 31 to trigger the thread cutting mechanism 3 to perform thread cutting action, and at the moment, the presser foot lifting mechanism 4 does not act; when the driving wheel 2 rotates reversely until the driving part 21 acts on the presser foot lifting trigger 41, the presser foot lifting mechanism 4 is triggered to lift the presser foot, and the thread trimming mechanism 3 does not act at this time.
Therefore, the embodiment has a simple structure, the thread cutting action and the presser foot lifting action are not influenced mutually, the driving wheel 2 can accurately control the thread cutting action and the presser foot lifting action by controlling the rotating direction, and the lifting height of the presser foot lifting action can be accurately controlled by controlling the rotating angle.
The driving wheel 2 further includes an idle stroke portion 22, the driving portion 21 is connected to one side edge of the idle stroke portion 22, the idle stroke portion 22 abuts against the presser foot lifting trigger 41 side when the driving portion 21 drives the thread cutting trigger 31 to operate, and the idle stroke portion 22 abuts against the thread cutting trigger 31 side when the driving portion 21 drives the presser foot lifting trigger 41 to operate. In this embodiment, the idle stroke portion 22 is kept in contact with the presser foot lifting trigger 41 or the thread trimming trigger 31 during trimming or presser foot lifting, so that the thread trimming trigger 31 or the presser foot lifting trigger 41 does not generate a large noise due to hitting the driving wheel 2 when switching the operation of trimming or presser foot lifting. It can be seen that the provision of the idle stroke portion 22 has the effect of reducing noise.
Referring to fig. 2 and 6, further, the thread trimming and presser foot lifting mechanism further comprises a base 5, the driving device 1 is fixedly mounted on the base 5, the thread trimming mechanism 3 and the presser foot lifting mechanism 4 are also mounted on the base 5, the structure is compact, during assembly, the driving device 1, the thread trimming mechanism 3 and the presser foot lifting mechanism 4 can be firstly assembled on the base 5, and then the base 5 is assembled on a frame of the overedger, so that the assembly efficiency can be greatly improved. The base 5 includes a base plate 51 and a power source mounting plate 52. The power source mounting plate 52 is vertically provided on the base plate 51, and the drive device 1 is mounted on the power source mounting plate 52. The base plate 51 is used for being mounted on a frame of the overedger, so that the base 5 and the mechanism mounted thereon can be mounted on the overedger through the base plate 51.
Referring to fig. 2-4, further, the thread trimming mechanism 3 further includes: a cutting push rod 32, an elastic reset piece 33, a cutting link 37, a knife shaft 38 and a knife 382.
The thread trimming push rod 32 is movably mounted on the base 5 up and down. The thread cutting trigger 31 is arranged on the thread cutting push rod 32, and when the driving wheel 2 rotates in the forward direction, the driving wheel 2 drives the thread cutting trigger 31 to move upwards and lift the thread cutting push rod 32 upwards. The elastic restoring member 33 acts on the thread cutting push rod 32 to restore the thread cutting push rod 32. The middle part of the thread trimming connecting rod 37 is hinged with the thread trimming push rod 32. "the middle of the trimming link 37" refers to any position between both ends of the trimming link 37, and is not limited to the middle. One end of the thread trimming link 37 is rotatably mounted on the base 5 through the first rotating shaft 371, and when the thread trimming push rod 32 moves up and down, the thread trimming push rod 32 drives the thread trimming link 37 to rotate around the first rotating shaft 371. The other end of the thread trimming link 37 acts on one end of the cutter shaft 38 to drive the cutter shaft 38 to rotate in the direction opposite to the rotation direction of the thread trimming link 37 by the rotation of the thread trimming link 37. The knife 382 is fixedly arranged at the other end of the knife shaft 38, and when the knife shaft 38 rotates, the knife 382 is driven to rotate to cut the thread. The first rotary shaft 371 is an axial screw, and is simple in structure and easy to assemble.
In this embodiment, when the driving device 1 rotates in the forward direction, the driving wheel 2 rotates in the forward direction, the driving portion 21 lifts the trimming trigger 31 upward, the trimming trigger 31 moves upward together with the trimming push rod 32, the trimming push rod 32 pushes the trimming link 37 to rotate the trimming link 37 about the first rotation shaft 371, the trimming link 37 drives the cutter shaft 38 to rotate, and further drives the cutter 382 to rotate, thereby performing a trimming operation, and at this time, the elastic reset member 33 accumulates a certain reverse elastic force. After the thread trimming is completed, the driving device 1 moves reversely, and under the reverse elasticity of the elastic reset piece 33, the thread trimming push rod 32 moves downwards to reset, and simultaneously drives the thread trimming connecting rod 37 to rotate reversely to reset, and the knife 382 resets along with the thread trimming push rod, and waits for the next thread trimming action.
Further, the thread cutting trigger 31 is a pulley, and is rotatably mounted on the thread cutting push rod 32 via a shaft screw 311. Because the trimming triggering part 31 is a pulley, the friction force is small when the driving wheel 2 contacts with the trimming triggering part 31, the phenomenon of clamping stagnation when the driving wheel 2 acts on the trimming triggering part 31 is avoided, and the driving wheel 2 can more accurately control the trimming mechanism 3 to trim wires.
Further, two mounting arms 321 arranged at intervals are arranged at the upper end of the thread trimming push rod 32, the thread trimming connecting rod 37 is inserted between the two mounting arms 321, a bolt 3211 penetrates through the thread trimming connecting rod 37 and the two mounting arms 321, and two ends of the bolt 3211 are fixed on the two mounting arms 321 through set screws 3212. During assembly, the middle part of the trimming connecting rod 37 is placed between the two mounting arms 321, the bolt 3211 is inserted, the bolt 3211 sequentially penetrates through one of the mounting arms 321, the trimming connecting rod 37 and the other mounting arm 321, and finally the set screw 3212 is installed to fix the two ends of the bolt 3211 on the two mounting arms 321. When the thread trimming push rod 32 moves upward, the thread trimming link 37 rotates relative to the thread trimming push rod 32, the thread trimming link 37 is pushed to rotate around the first rotation shaft 371, and the other end of the thread trimming link 37 moves upward. The structure of the embodiment is reliable in connection, the smoothness of rotation of the trimming connecting rod 37 can be ensured, and the service life is long.
Further, the trimming mechanism 3 further comprises a shaft sleeve 34, the base 5 is provided with a trimming mounting plate 53, the shaft sleeve 34 is fixedly mounted on the trimming mounting plate 53, the trimming push rod 32 is inserted into the shaft sleeve 34 and can move up and down relative to the shaft sleeve 34, the length of the trimming push rod 32 is greater than that of the shaft sleeve 34, and the elastic reset piece 33 is connected with the trimming mounting plate 53 and the trimming push rod 32 to reset the trimming push rod 32. The shaft sleeve 34 is arranged to guide the movement of the trimming push rod 32, and the trimming push rod 32 is prevented from deflecting.
In one embodiment, the sleeve 34 is a linear bearing, so that the rod of the trimming push rod 32 can move up and down more smoothly in the linear bearing. In another embodiment, the bushing 34 is a bushing with a smooth inner surface, and the bushing plays a guiding role to prevent the trimming push rod 32 from tilting after moving up and down for many times. The bushing may be a metal bushing, such as a copper bushing, a stainless steel bushing, or a non-metal bushing.
The trimming mounting plate 53 is provided with a mounting hole 531, and the shaft sleeve 34 passes through the mounting hole 531 to be mounted on the trimming mounting plate 53, so that reliable mounting of the shaft sleeve 34 is ensured.
Further, the thread trimming mechanism 3 further comprises a spacer 35 and a lock nut 36, the lock nut 36 is fixed to the lower end of the thread trimming push rod 32 through threaded fit, and the spacer 35 is fixed to the lower end of the thread trimming push rod 32. The elastic restoring member 33 is a spring, the spring is sleeved outside the shaft sleeve 34, and two ends of the spring are pressed between the trimming mounting plate 53 and the spacer 35, so that the trimming pushing rod 32 has a tendency of moving downwards for restoration. The embodiment has simple structure and convenient assembly. The gasket 35, the locking nut 36 and the spring can be made of standard parts and are low in price. Further, the number of the locking nuts 36 is two, and the two locking nuts 36 can be locked with each other, so that the loosening is avoided.
Further, the trimming push rod 32 includes a mounting portion 322 and a rod portion 323, the mounting portion 322 is located above the rod portion 323, a step is formed between the mounting portion 322 and the rod portion 323, the rod portion 323 is inserted into the shaft sleeve 34, and the trimming mechanism 3 further includes a buffer washer 39, and the buffer washer 39 is sleeved outside the rod portion 323 and is located between the mounting portion 322 and the shaft sleeve 34. The buffering washer 39 is arranged to play a buffering role, so that the installation part 322 is prevented from directly impacting the shaft sleeve 34 when the trimming push rod 32 moves up and down, the trimming push rod 32 is prevented from moving to generate loud sound, and the trimming push rod 32 is prevented from being worn.
Further, the mounting arm 321 is disposed on the mounting portion 322, and the trimming trigger 31 is disposed on a side surface of the mounting portion 322.
Furthermore, a shift lever 372 is disposed at the other end of the thread trimming connecting rod 37, a crank 381 is fixedly disposed at one end of the knife shaft 38, the crank 381 has a sliding groove 3811, and the shift lever 372 is inserted into the sliding groove 3811 and slidably engages with the sliding groove 3811. When the thread trimming connecting rod 37 rotates around the rotating shaft, the driving rod 372 slides in the sliding groove 3811, so that the crank 381 rotates around the cutter shaft 38, and the cutter 382 rotates to perform thread trimming. In this embodiment, the driving rod 372 slides in the sliding groove 3811 to drive the crank 381 to rotate, and further drive the knife shaft 38 and the knife 382 to rotate together, so as to complete the thread trimming operation. In one embodiment, the rod 372 is a screw mounted to the shear link 37, which is simple, inexpensive, and easy to assemble. The crank 381 can be fixed on the knife shaft 38 through a set screw 3212, and is convenient to assemble.
Referring to fig. 2 and 5, further, the presser foot lifting mechanism 4 further includes: a presser foot lifting lever 42, a hook 43, a presser foot lifting small lever 44, a reset torsion spring 45, a presser foot shaft 46, a presser foot arm 47 and a presser foot assembly 48.
One end of the presser foot lifting lever 42 is rotatably mounted on the base 5 via a second rotating shaft 421. The presser foot raising trigger 41 is a pulley and is rotatably attached to the other end of the presser foot raising lever 42 via a pin 411. One end of the hook 43 hooks the middle part of the presser foot lifting lever 42, and the other end hooks one end of the presser foot lifting small lever 44. The "middle of the presser foot lifting lever 42" refers to an arbitrary position between both ends of the presser foot lifting lever 42. The other end of the small lever 44 is sleeved outside one end of the presser foot shaft 46. A retainer ring 461 is fixedly arranged at one end of the presser foot shaft 46, and the retainer ring 461 is matched with the presser foot lifting small lever 44 to drive the presser foot shaft 46 to rotate by the presser foot lifting small lever 44. The reset torsion spring 45 acts on the presser foot lifting small lever 44 to reset the presser foot lifting small lever 44. The presser foot arm 47 is fixedly arranged at the other end of the presser foot shaft 46. The presser foot assembly 48 is fixedly connected to the presser foot arm 47. When the driving wheel 2 rotates reversely to drive the presser foot lifting trigger 41 to move downwards, the presser foot lifting lever 42 rotates around the second rotating shaft 421, the hook 43 pulls one end of the presser foot lifting small lever 44 downwards, the presser foot lifting small lever 44 pushes the retainer ring 461 to rotate, the retainer ring 461 drives the presser foot shaft 46 to rotate, the presser foot arm 47 rotates around the presser foot shaft 46, and the presser foot assembly 48 lifts the presser foot.
The second rotating shaft 421 is a shaft position screw, and has a simple structure and is easy to assemble. Because the presser foot lifting trigger 41 is a pulley, the friction force is small when the driving wheel 2 is in contact with the presser foot lifting trigger 41, so that the idle stroke part 22 can rotate on the presser foot lifting trigger 41 without triggering the action of the presser foot lifting mechanism 4, meanwhile, the phenomenon of clamping stagnation when the driving part 21 of the driving wheel 2 acts on the thread trimming trigger 31 is avoided, and the driving wheel 2 can more accurately control the action of the presser foot lifting mechanism 4.
In this embodiment, the presser foot lifting lever 42 is a curved bar structure, and the presser foot lifting small lever 44 is a straight bar structure.
Referring to fig. 8, in an embodiment, the thread trimming and presser foot lifting mechanism further includes a reset mechanism 6, and the reset mechanism 6 is used for resetting the driving wheel 2. Further, the driving device 1 is a motor, the reset mechanism 6 includes a magnet fixing frame 61 and a hall sensor switch 62, the magnet fixing frame 61 is fixedly installed on the driving wheel 2, and a magnet (not shown) is fixedly installed on the magnet fixing frame 61. The hall inductive switch 62 is electrically connected to the driving device 1, the hall inductive switch 62 senses the magnetic field strength of the magnet and outputs a corresponding voltage signal to the driving device 1, and the driving device 1 controls the driving wheel 2 to rotate according to the voltage signal.
Since the magnet fixing frame 61 rotates along with the rotation of the driving wheel 2, the distance between the magnet and the hall sensor switch 62 changes along with the rotation of the driving wheel 2, and thus the intensity of the magnetic field sensed by the hall sensor switch 62 changes. The hall sensor switches 62 output corresponding voltage values according to the sensed magnetic field strengths, and the positions of the driving wheels 2 correspond to the voltage values one to one. Assuming that the initial position of the driving wheel 2 corresponds to 1 voltage value, when the driving wheel 2 needs to return to the initial position, the motor starts to rotate until receiving the corresponding hall voltage (i.e. 1 voltage value), and it is determined that the driving wheel 2 reaches the initial position, and the motor stops rotating.
As can be seen from fig. 8, in the initial position, the magnet holder 61 faces the hall sensor switch 62, and the voltage output by the hall sensor switch 62 is the maximum, which is taken as the initial voltage value. If the voltage detected during the rotation of the motor is changed from small to large, the motor continues to rotate until the set initial voltage value position. If the motor detects that the voltage is changed from large to small, the rotation direction is not correct, and the motor rotates reversely until the set initial voltage value position is reached. The rotating angle of the motor can be accurately controlled by arranging the reset mechanism 6, so that the height of the presser foot lifting is determined, and the motor can control the driving wheel 2 to return to the initial position, namely reset the driving wheel 2 when the motor is out of step caused by mechanism jamming or other factors.
With reference to fig. 2, the working principle of the thread trimming and presser foot lifting mechanism according to an embodiment of the present invention is as follows:
when the thread cutting is needed, the driving device 1 rotates counterclockwise, the driving wheel 2 rotates clockwise, the driving part 21 lifts the thread cutting trigger 31 upwards, the thread cutting push rod 32 moves upwards simultaneously, the elastic reset piece 33 is compressed, the upper end of the thread cutting push rod 32 jacks up the thread cutting connecting rod 37, the thread cutting connecting rod 37 rotates counterclockwise around the first rotating shaft 371, the shift lever 372 slides in the sliding groove 3811, the crank 381 is pushed to rotate clockwise around the cutter shaft 38, and the cutter 382 fixed at the other end of the cutter shaft 38 rotates clockwise along with the crank and finishes the thread cutting action. When the thread trimming mechanism 3 performs a thread trimming operation, the idle stroke portion 22 abuts on the presser foot lifting trigger 41 side, and the presser foot lifting mechanism 4 does not operate. Then, the driving device 1 rotates clockwise, the thread trimming push rod 32 moves downward due to the acting force of the elastic reset member 33, and drives the thread trimming connecting rod 37 to rotate clockwise around the first rotating shaft 371, the shift lever 372 slides in the chute 3811, the crank 381 is pushed to rotate counterclockwise around the knife shaft 38, the knife 382 rotates counterclockwise along with the crank, and returns to the original position to wait for the next thread trimming operation.
When the presser foot needs to be lifted, the driving device 1 rotates clockwise until the driving part 21 contacts the presser foot lifting trigger 41, at this time, the idle stroke part 22 leans against one side of the trimming trigger 31, the driving wheel 2 continues to rotate clockwise, the presser foot lifting lever 42 is driven to rotate clockwise around the second rotating shaft 421, the hook 43 pulls down one end of the presser foot lifting small lever 44, the other end of the presser foot lifting small lever 44 presses the check ring 461 to enable the check ring 461 to rotate around the presser foot shaft 46, the presser foot shaft 46 and the check ring 461 rotate together to lift the presser foot arm 47, and the presser foot assembly 48 on the presser foot arm 47 is lifted, so that the presser foot lifting operation is completed. The height of the presser foot can be accurately controlled by controlling the rotation angle of the driving wheel 2. Then, the driving device 1 rotates counterclockwise, the presser foot lifting small lever 44 rotates reversely to reset under the action of the reset torsion spring 45, the hook 43 pulls the presser foot lifting lever 42 to reset, simultaneously, the presser foot shaft 46 rotates reversely to reset, the presser foot lifting arm 47 and the presser foot assembly 48 thereon rotate reversely to reset, and the next presser foot lifting action is waited.
The invention also provides an overlock machine which comprises the thread trimming and presser foot lifting mechanism in any one of the embodiments.
All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that suitable changes and modifications of the above embodiments are within the scope of the claimed invention as long as they are within the spirit and scope of the present invention.
Claims (9)
1. The utility model provides a trimming lifts presser foot mechanism which characterized in that includes: the device comprises a driving device, a driving wheel, a thread trimming mechanism and a presser foot lifting mechanism; the driving wheel is connected with the driving device, and the driving device drives the driving wheel to rotate; the thread cutting mechanism and the presser foot lifting mechanism are matched with the driving wheel, and the rotation of the driving wheel respectively controls the thread cutting mechanism to perform thread cutting action or controls the presser foot lifting mechanism to perform presser foot lifting action; when the driving wheel rotates forwards, the driving wheel drives the thread cutting mechanism to act, and the presser foot lifting mechanism does not act; when the driving wheel rotates reversely, the driving wheel drives the presser foot lifting mechanism to act, and the thread cutting mechanism does not act;
the driving wheel comprises a driving hole connected with the driving device, the driving wheel rotates by taking the driving hole as a rotation center, the driving wheel further comprises a driving part used for triggering the action of the thread cutting mechanism or the presser foot lifting mechanism, the thread cutting mechanism comprises a thread cutting triggering part, the presser foot lifting mechanism comprises a presser foot lifting triggering part, the thread cutting triggering part and the presser foot lifting triggering part are respectively arranged at two sides of the driving part, when the driving wheel rotates forwards, the driving part acts on the thread cutting triggering part to trigger the thread cutting mechanism to carry out thread cutting action, and at the moment, the presser foot lifting mechanism does not act; when the driving wheel rotates reversely until the driving part acts on the presser foot lifting triggering piece, the presser foot lifting mechanism is triggered to lift the presser foot, and the thread trimming mechanism does not act at the moment;
the thread trimming and presser foot lifting mechanism further comprises a base, and the driving device is fixedly arranged on the base;
the thread trimming mechanism further comprises: the wire cutting push rod, the elastic reset piece, the wire cutting connecting rod, the cutter shaft and the cutter are arranged on the wire cutting push rod;
the trimming push rod can be movably arranged on the base up and down;
the trimming trigger piece is arranged on the trimming push rod, and when the driving wheel rotates in the forward direction, the driving wheel drives the trimming trigger piece to move upwards and lift the trimming push rod upwards;
the elastic resetting piece acts on the thread cutting push rod to reset the thread cutting push rod;
the middle part of the trimming connecting rod is hinged with the trimming push rod, one end of the trimming connecting rod is rotatably arranged on the base through a first rotating shaft, and when the trimming push rod moves up and down, the trimming push rod drives the trimming connecting rod to rotate by taking the first rotating shaft as a center;
the other end of the thread trimming connecting rod acts on one end of the cutter shaft so as to drive the cutter shaft to rotate in a direction opposite to the rotating direction of the thread trimming connecting rod through the rotation of the thread trimming connecting rod;
the cutter is fixedly arranged at the other end of the cutter shaft, and when the cutter shaft rotates, the cutter is driven to rotate to cut the thread;
the other end of the trimming connecting rod is provided with a shifting lever, one end of the cutter shaft is fixedly provided with a crank, the crank is provided with a sliding groove, the shifting lever is inserted into the sliding groove and is in sliding fit with the sliding groove, when the trimming connecting rod rotates by taking the rotating shaft as a center, the shifting lever slides in the sliding groove to drive the crank to rotate by taking the cutter shaft as a center and drive the cutter to rotate so as to perform trimming.
2. The thread trimming presser foot lifting mechanism of claim 1 wherein the thread trimming trigger is a pulley rotatably mounted to the thread trimming push rod by a shaft screw.
3. The thread trimming presser foot lifting mechanism according to claim 1, wherein the upper end of the thread trimming push rod is provided with two mounting arms arranged at intervals, the thread trimming connecting rod is inserted between the two mounting arms, a bolt penetrates through the thread trimming connecting rod and the two mounting arms, and two ends of the bolt are fixed on the two mounting arms through set screws.
4. The thread trimming presser foot lifting mechanism according to claim 1, wherein the thread trimming mechanism further comprises a shaft sleeve, the base is provided with a thread trimming mounting plate, the shaft sleeve is fixedly mounted on the thread trimming mounting plate, the thread trimming push rod is inserted into the shaft sleeve and can move up and down relative to the shaft sleeve, the length of the thread trimming push rod is greater than that of the shaft sleeve, and the elastic reset member is connected with the thread trimming mounting plate and the thread trimming push rod to reset the thread trimming push rod.
5. The thread lifting and pressing foot mechanism according to claim 4, wherein the thread cutting mechanism further comprises a spacer and a lock nut, the lock nut is fixed to the lower end of the thread cutting push rod in a threaded fit manner, the spacer is fixed to the lower end of the thread cutting push rod, the elastic reset member is a spring, the spring is sleeved on the outer side of the shaft sleeve, and two ends of the spring are abutted between the thread cutting mounting plate and the spacer, so that the thread cutting push rod tends to move downwards for resetting.
6. The thread trimming presser foot lifting mechanism according to claim 4, wherein the thread trimming push rod comprises a mounting portion and a rod portion, the mounting portion is located above the rod portion, a step is formed between the mounting portion and the rod portion, the rod portion is inserted into the shaft sleeve, the thread trimming mechanism further comprises a buffer washer, and the buffer washer is sleeved on the outer side of the rod portion and is arranged between the mounting portion and the shaft sleeve.
7. The thread trimming presser foot lifting mechanism of claim 4, wherein the bushing is a bushing or a linear bearing with a smooth inner surface.
8. The thread trimming presser foot lifting mechanism of claim 1, wherein the driving device is a motor, and the driving wheel further comprises an idle stroke portion, the driving portion is connected to an edge of one side of the idle stroke portion, the idle stroke portion is located at a side of the presser foot lifting trigger when the driving portion drives the thread trimming trigger to operate, and the idle stroke portion is located at a side of the thread trimming trigger when the driving portion drives the presser foot lifting trigger to operate.
9. An overlock machine, comprising a trimming and presser foot lifting mechanism according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110665092.5A CN113235231B (en) | 2019-10-12 | 2019-10-12 | Thread trimming and presser foot lifting mechanism and overedger |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910969104.6A CN110670249B (en) | 2019-10-12 | 2019-10-12 | Thread trimming and presser foot lifting mechanism and overedger |
| CN202110665092.5A CN113235231B (en) | 2019-10-12 | 2019-10-12 | Thread trimming and presser foot lifting mechanism and overedger |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910969104.6A Division CN110670249B (en) | 2019-10-12 | 2019-10-12 | Thread trimming and presser foot lifting mechanism and overedger |
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| CN113235231A CN113235231A (en) | 2021-08-10 |
| CN113235231B true CN113235231B (en) | 2022-09-20 |
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| CN202110665092.5A Active CN113235231B (en) | 2019-10-12 | 2019-10-12 | Thread trimming and presser foot lifting mechanism and overedger |
| CN201910969104.6A Active CN110670249B (en) | 2019-10-12 | 2019-10-12 | Thread trimming and presser foot lifting mechanism and overedger |
| CN202110665831.0A Active CN113235232B (en) | 2019-10-12 | 2019-10-12 | Thread trimming and presser foot lifting mechanism and overedger |
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| CN201910969104.6A Active CN110670249B (en) | 2019-10-12 | 2019-10-12 | Thread trimming and presser foot lifting mechanism and overedger |
| CN202110665831.0A Active CN113235232B (en) | 2019-10-12 | 2019-10-12 | Thread trimming and presser foot lifting mechanism and overedger |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112391746A (en) * | 2020-10-30 | 2021-02-23 | 浙江广和缝纫机有限公司 | Presser foot lifting and trimming device of overedger |
| CN112941745A (en) * | 2021-03-31 | 2021-06-11 | 上海富山精密机械科技有限公司 | Thread trimming and presser foot lifting device and sewing machine |
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- 2019-10-12 CN CN202110665092.5A patent/CN113235231B/en active Active
- 2019-10-12 CN CN201910969104.6A patent/CN110670249B/en active Active
- 2019-10-12 CN CN202110665831.0A patent/CN113235232B/en active Active
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| Publication number | Publication date |
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| CN110670249A (en) | 2020-01-10 |
| CN113235232B (en) | 2022-05-20 |
| CN113235232A (en) | 2021-08-10 |
| CN113235231A (en) | 2021-08-10 |
| CN110670249B (en) | 2022-03-22 |
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