CN113005647B - Needle distance adjusting and presser foot lifting device of sewing machine - Google Patents
Needle distance adjusting and presser foot lifting device of sewing machine Download PDFInfo
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- CN113005647B CN113005647B CN202110174687.0A CN202110174687A CN113005647B CN 113005647 B CN113005647 B CN 113005647B CN 202110174687 A CN202110174687 A CN 202110174687A CN 113005647 B CN113005647 B CN 113005647B
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- presser foot
- foot lifting
- cam
- adjusting
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B27/00—Work-feeding means
- D05B27/22—Work-feeding means with means for setting length of stitch
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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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- Sewing Machines And Sewing (AREA)
Abstract
The invention belongs to the technical field of sewing machine equipment, and particularly relates to a needle distance adjusting and presser foot lifting device of a sewing machine. The needle distance adjusting device solves the problems that the needle distance adjusting precision is poor and the like when the existing functions of lifting the presser foot and adjusting the needle distance of the sewing machine are controlled by one driving device. The needle pitch adjusting and presser foot lifting device of the sewing machine comprises a rotary driving source, a needle pitch adjusting connecting rod and a presser foot lifting lever, wherein a rotating shaft is arranged on the rotary driving source, a needle pitch adjusting cam is sleeved on the rotating shaft, a cam groove is formed in the needle pitch adjusting cam, a needle pitch adjusting rolling part positioned in the cam groove is arranged on the needle pitch adjusting connecting rod, a presser foot lifting cam is sleeved on the rotating shaft, a presser foot lifting rolling part propped against the end face of the presser foot lifting cam is arranged on the presser foot lifting lever, a presser foot lifting face is arranged on the end face of the presser foot lifting cam in a protruding mode, and a presser foot is lifted when the presser foot lifting rolling part is propped against the presser foot lifting face. The invention reduces the influence on the stitch length adjusting precision and is convenient for adjusting stitch length adjustment and raising presser foot.
Description
Technical Field
The invention belongs to the technical field of sewing machine equipment, and particularly relates to a needle distance adjusting and presser foot lifting device of a sewing machine.
Background
A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on a fabric, and interweaves or sews one or more layers of the fabric. The sewing machine is generally composed of a feeding device, a base, a transmission part and an accessory part, and the sewing materials are sewn together through reasonable matching and circulating work of the movements of the mechanisms.
At present, the sewing machine can use the functions of automatically lifting the presser foot and automatically adjusting the stitch length in the sewing process. The automatic presser foot lifting function is realized by independently driving the presser foot lifting mechanism to act through an electromagnet, and the automatic stitch length adjusting function is realized by driving the stitch length adjusting mechanism to act through a stepping motor. The driving mode has the defects of complex structure and low transmission efficiency.
For example, chinese patent (application No. 201910097855.3) proposes a cam, on which a presser foot lifting cam body and a needle pitch adjusting cam body are integrated, the periphery of the presser foot lifting cam body has a presser foot lifting profile surface for being matched with a presser foot lifting ball on a presser foot lifting driving crank and driving the presser foot lifting driving crank to drive a presser foot lifting mechanism to act; the periphery of the gauge cam body is provided with a gauge profile surface which is used for being matched with gauge balls on a gauge driving crank and driving the gauge driving crank to drive the gauge mechanism to act. The cam integrates the functions of needle pitch adjustment and presser foot lifting, but the cam realizes the function of lifting the presser foot, the presser foot lifting ball is required to be abutted against the circumferential outer side surface of the cam at all times, and when the presser foot is required to be lifted, the presser foot lifting ball is contacted with the presser foot lifting contour surface. Since the presser foot lifting ball is abutted against the circumferential outer side surface of the cam at a time, it is inevitable that a pressing force acts on the circumferential outer side surface of the cam through the presser foot lifting ball. The extrusion force is transmitted to the motor shaft through the cam, and the circle run-out error of the motor rotating shaft is influenced, so that poor contact is generated between the gauge needle adjusting profile surface on the cam and the gauge needle adjusting ball. The needle pitch adjustment amount is small, and the required adjustment precision is high, so that when poor contact occurs between the needle pitch adjustment profile surface and the needle pitch adjustment ball, the poor contact is finally reflected on the needle pitch adjustment, and the needle pitch adjustment precision is not high.
In the above patent, the needle pitch adjusting and presser foot lifting functions are integrated on one cam, and in the long-term operation process of the sewing machine, the related contour surface on the cam is worn due to the circle run-out error of the motor shaft, and adjustment is needed. However, the sewing machine may have problems of normal stitch length adjustment and abnormal presser foot adjustment; or the problem that the needle pitch adjustment is abnormal and the presser foot lifting function is normal occurs. The cam can be adopted to cause the difficulty in adjusting the profile surface of the pin adjusting and presser foot lifting functions on the cam to be increased.
Disclosure of Invention
The invention aims at solving the problems in the prior art, and provides a needle pitch adjusting and presser foot lifting device of a sewing machine, which aims at solving the technical problems that: how to control the presser foot lifting and stitch length adjusting functions through a driving device, the influence on stitch length adjusting precision is reduced, and the stitch length adjusting and presser foot lifting functions are convenient to adjust.
The aim of the invention can be achieved by the following technical scheme:
the needle pitch adjusting and presser foot lifting device of the sewing machine comprises a rotary driving source, a needle pitch adjusting connecting rod and a presser foot lifting lever, wherein a rotating shaft is arranged on the rotary driving source, a needle pitch adjusting cam is sleeved on the rotating shaft, a cam groove is formed in the needle pitch adjusting cam, a needle pitch adjusting rolling element which is positioned in the cam groove and abuts against the groove wall of the cam groove is arranged on the needle pitch adjusting connecting rod, and the presser foot lifting device is characterized in that the presser foot lifting cam is further sleeved on the rotating shaft, a presser foot lifting rolling element abutting against the end face of the presser foot lifting cam is arranged on the presser foot lifting lever, a presser foot lifting surface which can abut against the presser foot lifting rolling element is arranged on the end face of the presser foot lifting cam in a protruding mode, and a presser foot is lifted when the presser foot lifting rolling element abuts against the presser foot lifting surface.
The rotating shaft of the rotating driving source drives the needle pitch adjusting cam and the presser foot lifting cam to synchronously rotate, the needle pitch adjusting rolling element on the needle pitch adjusting connecting rod is abutted against the inner wall of the cam groove, and the relative position of the cam groove and the needle pitch adjusting rolling element is changed along with the rotation of the needle pitch adjusting cam, so that the needle pitch of the sewing machine is adjusted; when the presser foot lifting rolling element contacts with the end face of the presser foot lifting cam, the presser foot of the sewing machine is in an un-lifted state, and when the rotating shaft rotates to drive the presser foot lifting cam to rotate, the presser foot lifting rolling element is abutted against the presser foot lifting surface, the contact position of the presser foot lifting surface and the presser foot lifting rolling element is gradually changed along with the continuous rotation of the rotating shaft, and the presser foot lifting lever is deflected to gradually lift the presser foot; according to the presser foot lifting lever, the presser foot lifting rolling piece is abutted against the end face of the presser foot lifting cam, so that force acting on the presser foot lifting cam by the presser foot lifting lever is applied axially along the rotating shaft; because the presser foot lifting cam and the needle pitch adjusting cam are arranged on the rotating shaft in a split manner, when the presser foot lifting function fails, the presser foot lifting function can be recovered to be normal by independently adjusting the presser foot lifting cam, and the needle pitch adjusting cam is not influenced; when the stitch length adjustment is deviated, the stitch length adjustment precision can be recovered to be normal by independently adjusting the stitch length adjustment cam, and the presser foot lifting cam is not influenced.
In the needle pitch adjusting and presser foot lifting device of the sewing machine, the end face of the presser foot lifting cam is convexly provided with the presser foot lifting lug, the presser foot lifting surface is positioned on the presser foot lifting lug, one end of the presser foot lifting surface is connected with the end face of the presser foot lifting cam in a coplanar manner, and a distance is reserved between the other end of the presser foot lifting surface and the end face of the presser foot lifting cam. The presser foot lifting surface is positioned on the presser foot lifting lug, one end of the presser foot lifting surface is connected with the end surface of the presser foot lifting cam in a coplanar manner, the other end of the presser foot lifting surface is spaced from the end surface of the presser foot lifting cam, the presser foot lifting lug is driven to rotate along with the rotating shaft to lift the presser foot cam, the position of the presser foot lifting lug relative to the presser foot lifting rolling member is changed, the presser foot lifting surface acts on the presser foot lifting rolling member, and then the presser foot lifting lever swings to lift or fall off the presser foot, and the force of the presser foot lifting lever acting on the presser foot lifting cam is always applied along the axial direction of the rotating shaft in the process of acting on the presser foot lifting rolling member.
In the needle pitch adjusting and presser foot lifting device of the sewing machine, the presser foot lifting convex block is further provided with a presser foot lifting and holding surface which can be abutted against the presser foot lifting rolling piece, the presser foot lifting and holding surface is parallel to the end face of the presser foot lifting cam, and the presser foot lifting and holding surface is connected with the other end of the presser foot lifting surface. The rotating shaft drives the presser foot lifting cam to rotate, so that the presser foot lifting lever swings to lift the presser foot, and when the presser foot is lifted to the preset maximum lifting height, the presser foot lifting rolling piece abuts against the presser foot lifting holding surface, the height of the presser foot is kept from being continuously lifted, and the occurrence of faults caused by excessive lifting of the presser foot is prevented.
In the needle pitch adjusting and presser foot lifting device of the sewing machine, the cam groove comprises a needle pitch adjusting section and a needle pitch holding section, when the needle pitch adjusting rolling element is positioned in the needle pitch adjusting section, the end face of the presser foot lifting cam of the presser foot lifting rolling element is abutted against, and when the needle pitch adjusting rolling element is positioned in the needle pitch holding section, the presser foot lifting rolling element is abutted against the presser foot lifting surface or the presser foot lifting holding surface. When the needle pitch adjusting rolling element is positioned in the needle pitch adjusting section, the end faces of the presser foot lifting cams of the presser foot lifting rolling element are abutted against each other, so that the presser foot lifting cams do not act on the presser foot lifting levers when the needle pitch is adjusted, and the presser foot is kept in a pressing state; when the needle pitch adjusting rolling element is positioned in the needle pitch holding section, along with the rotation of the rotating shaft, the presser foot lifting rolling element is abutted against the presser foot lifting surface and drives the presser foot lifting lever to swing to lift the presser foot, finally, when the presser foot lifting rolling element is abutted against the presser foot lifting holding surface, the presser foot is lifted to a preset maximum lifting height and held, in the process, the force acting on the presser foot lifting cam by the presser foot lifting lever and the presser foot lifting rolling element is applied along the axial direction of the rotating shaft, so that the rotating shaft of the rotating driving source is prevented from further generating a circle jumping error, the matching precision between the cam groove and the needle pitch adjusting rolling element is ensured, the influence on the needle pitch adjusting precision is reduced, and the influence on the needle pitch adjusting precision is reduced when the presser foot lifting and needle pitch adjusting functions are controlled through one rotating driving source.
In the needle distance adjusting and presser foot lifting device of the sewing machine, the cam groove is provided with two closed ends respectively positioned at the end part of the needle distance adjusting section and the end part of the needle distance holding section, and a space is reserved between the two closed ends. The space between the two closed ends enables the cam groove to be in a non-closed loop state, which is beneficial to improving the strength of the gauge needle cam and preventing deformation during processing heat treatment.
In the stitch length adjusting and presser foot lifting device of the sewing machine, the distance between the stitch length adjusting section and the rotation center of the stitch length adjusting cam is gradually reduced, the corresponding stitch length is also gradually reduced, the stitch length holding section and the rotation center of the stitch length adjusting cam are concentrically arranged, and the corresponding stitch length is kept at a maximum value. The pitch between the pitch adjusting section and the pitch adjusting cam rotating center is changed to adjust the pitch, and the pitch maintaining section and the pitch adjusting cam rotating center are concentrically arranged, so that the pitch between the pitch maintaining section and the pitch adjusting cam rotating center is kept consistent, and the pitch is kept unchanged in the process of lifting the presser foot.
In the needle distance adjusting and presser foot lifting device of the sewing machine, the sewing machine comprises a machine shell, the presser foot lifting lever is hinged on the machine shell, the top end of the presser foot lifting lever is hinged with a presser foot lifting pull rod, and the presser foot lifting rolling piece is rotatably connected to the bottom end of the presser foot lifting lever. The rotating part of the presser foot lifting cam acts on the presser foot lifting rolling part on the bottom end of the presser foot lifting lever to enable the presser foot lifting lever to swing at the hinging point of the presser foot lifting lever and the machine shell to drive the presser foot lifting pull rod hinged on the top end of the presser foot lifting lever to move, so that the presser foot is lifted.
In the needle distance adjusting and presser foot lifting device of the sewing machine, the rotary driving source is a stepping motor or a servo motor. The stepping motor and the servo motor can execute forward rotation and overturning of the rotating shaft, so that stitch length adjustment and lifting of the presser foot are realized.
Compared with the prior art, the needle pitch adjusting and presser foot lifting device of the sewing machine has the following advantages:
1. the presser foot lifting lever is abutted against the end face of the presser foot lifting cam through the presser foot lifting rolling piece, so that force acting on the presser foot lifting cam by the presser foot lifting lever is applied axially along the rotating shaft, the rotating shaft of the driving source is prevented from further generating a circle run-out error, the matching precision between the cam groove and the needle distance adjusting rolling piece is ensured, and the influence on the needle distance adjusting precision is reduced.
2. The presser foot lifting rolling piece is abutted against the presser foot lifting and holding surface, the height of the presser foot lifting is kept from being continuously lifted, and the occurrence of faults caused by excessive lifting of the presser foot is prevented.
3. Because the presser foot lifting cam and the needle pitch adjusting cam are arranged on the rotating shaft in a split manner, when the presser foot lifting function fails, the presser foot lifting function can be recovered to be normal by independently adjusting the presser foot lifting cam, and the needle pitch adjusting cam is not influenced; when the stitch length adjustment is deviated, the stitch length adjustment precision can be recovered to be normal by independently adjusting the stitch length adjustment cam, and the presser foot lifting cam is not influenced.
Drawings
Fig. 1 is a schematic perspective view of a presser foot lifting roller bearing against the presser foot lifting cam end face.
Fig. 2 is a schematic perspective view of the presser foot lifting roller resting low on the presser foot lifting surface.
Fig. 3 is a schematic perspective view of the presser foot lifting roller resting low on the presser foot lifting holding surface.
Fig. 4 is a schematic perspective view of another view of the presser foot lifting roller resting low on the presser foot lifting holding surface.
Fig. 5 is a schematic perspective view of the gauge cam.
Fig. 6 is a front view of the gauge cam.
Fig. 7 is a schematic perspective view of a presser foot lifting cam.
In the figure, 1, a rotation driving source; 1a, a rotating shaft;
2. needle pitch adjusting cams; 2a, cam grooves; 2a1, a stitch length adjusting section; 2a2, a gauge needle holding section; 2a3, closed end;
3. a presser foot lifting cam; 3a, lifting the presser foot lug; 3a1, a presser foot lifting surface; 3a2, lifting the holding surface by the presser foot;
4. a needle pitch adjusting connecting rod; 4a, a first rod body; 4b, a second rod body;
5. a needle pitch adjusting rolling member; 6. a presser foot lifting lever; 7. a presser foot lifting rolling element; 8. a presser foot pull rod; 9. a high flat front lever; 10. a presser foot spring; 11. and (5) feeding the swinging plate seat.
Detailed Description
The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1 to 4, the sewing machine includes a housing, a presser foot, a presser bar guide bar, a presser bar guide, a presser bar spring 10, a pressure adjusting screw, a presser foot lifting plate, a high front lever 9, and a presser bar lifting lever 8. The pressure regulating screw is in threaded connection with the top of the pressure bar guide rod, the pressure bar and the presser foot spring 10 are sleeved on the pressure bar guide rod, the pressure bar can move up and down relative to the pressure bar guide rod, the presser foot is connected with the bottom end of the pressure bar, the two ends of the presser foot spring 10 respectively lean against the pressure regulating screw and the pressure bar, and the presser foot spring 10 presses the pressure bar to press the presser foot downwards.
As shown in fig. 1 to 4, the pressure bar guide frame is connected to the pressure bar, one end of the pressure bar lifting plate is hooked on the pressure bar guide frame, the other end is hinged with the high-level front lever 9, and the pressure bar lifting plate, the pressure bar and the pressure bar are driven to move up and down along with the swing of the high-level front lever 9. When the presser foot needs to be lifted, the high-level front lever 9 swings backwards to drive the presser foot lifting plate, the pressure lever and other parts to overcome the presser foot spring 10 to lift the presser foot; when the presser foot needs to fall back, the force acting on the high-level front lever 9 is removed, the high-level front lever 9 swings back forwards, the presser foot lifting plate, the pressing rod and other parts fall back under the action of the elastic force of the presser foot spring 10, and the presser foot keeps pressing down under the action of the elastic force of the presser foot spring 10. The presser foot lifting pull rod 8 is hinged to the high-level front lever 9, and the presser foot lifting pull rod 8 is pulled to drive the high-level front lever 9 to swing backwards, so that the presser foot is lifted. The lifting and falling of the presser foot are all applied to the existing sewing machine.
As shown in fig. 1 to 4, the stitch length adjusting and presser foot lifting device of the present sewing machine includes a rotation driving source 1, a stitch length adjusting link 4, and a presser foot lifting lever 6. The rotary driving source 1 is provided with a rotating shaft 1a, the rotating shaft 1a is sleeved with and connected with a needle pitch adjusting cam 2 and a presser foot lifting cam 3, and the rotating shaft 1a rotates to drive the needle pitch adjusting cam 2 and the presser foot lifting cam 3 to rotate. The rotary drive source 1 may employ a stepping motor or a servo motor, and preferably a stepping motor.
As shown in fig. 1 to 5, the gauge adjusting link 4 includes a first rod 4a and a second rod 4b, the ends of the first rod 4a and the second rod 4b are hinged to each other, the other end of the first rod 4a is further hinged to a feeding swing plate seat 11, the other end of the second rod 4b is hinged to the casing, and a gauge adjusting rolling member 5 is rotatably connected to a hinge point where the first rod 4a and the second rod 4b are hinged to each other. The end face of the needle pitch adjusting cam 2 is provided with a cam groove 2a, the needle pitch adjusting rolling element 5 is positioned in the cam groove 2a, and the needle pitch adjusting rolling element 5 is abutted against the groove wall of the cam groove 2 a.
Specifically, as shown in fig. 1 to 6, the cam groove 2a includes a stitch adjusting section 2a1 and a stitch holding section 2a2. The cam groove 2a is provided with two closed ends 2a3 respectively positioned at the end part of the needle distance adjusting section 2a1 and the end part of the needle distance maintaining section 2a2, and a space is reserved between the two closed ends 2a3, so that the cam groove 2a is in a non-closed loop state, the strength of the needle distance adjusting cam 2 is improved, and the deformation during the processing heat treatment is prevented.
As shown in fig. 1 to 6, the gauge cam 2 has a disk shape, the gauge adjusting section 2a1 is arranged eccentrically to the gauge cam 2, and the gauge holding section 2a2 is arranged concentrically to the gauge cam 2. Specifically, the distance between the path from the end of the stitch length adjusting section 2a1 connected with the stitch length holding section 2a2 to the closed end 2a3 of the stitch length adjusting section 2a1 and the rotation center of the stitch length adjusting cam 2 is gradually reduced, the corresponding stitch length is gradually reduced from the maximum value to the minimum value, the distance between any position on the same section of the groove wall on one side of the stitch length holding section 2a2 and the rotation center of the stitch length adjusting cam 2 is kept consistent, and the stitch length holding section 2a2 keeps the stitch length to the maximum value.
As shown in fig. 1 to 6, the pitch-adjusting cam 2 rotates along with the rotating shaft 1a, the cam groove 2a rotates with the rotation center of the pitch-adjusting cam 2, when the pitch-adjusting rolling element 5 is positioned on the pitch-adjusting section 2a1, the distance between the pitch-adjusting rolling element 5 and the rotation center of the pitch-adjusting cam 2 is changed, the first rod body 4a is driven to move up and down, and the first rod body acts on the feeding swing plate seat 11 to drive the pitch-adjusting assembly to move, so that the pitch adjustment is realized, and the pitch is reduced along with the reduction of the distance between the pitch-adjusting rolling element 5 and the rotation center of the pitch-adjusting cam 2; when the stitch length adjusting roller 5 is positioned on the stitch length holding section 2a2, the distance between the stitch length adjusting roller 5 and the rotation center of the stitch length adjusting cam 2 is not changed, so that the stitch length is kept at the maximum value.
As shown in fig. 1, 2, 3, 4 and 7, further, a presser foot lifting lug 3a is convexly arranged on the end face of the presser foot lifting cam 3, a presser foot lifting surface 3a1 and a presser foot lifting holding surface 3a2 are arranged on the presser foot lifting lug 3a, one end of the presser foot lifting surface 3a1 is connected with the end face of the presser foot lifting cam 3 in a coplanar manner, a space is reserved between the other end of the presser foot lifting surface 3a1 and the end face of the presser foot lifting cam 3, and the presser foot lifting surface 3a1 is arranged in an arc shape. The presser foot lifting and holding surface 3a2 is parallel to the end surface of the presser foot lifting and holding cam 3, and the presser foot lifting and holding surface 3a2 is connected to the other end of the presser foot lifting and holding surface 3a1, that is, the presser foot lifting and holding surface 3a2 is connected to the end of the presser foot lifting and holding surface 3a1 higher than the end surface of the presser foot lifting and holding cam 3.
As shown in fig. 1 to 4, the middle part of the presser foot lifting lever 6 is hinged on the machine shell, the top end of the presser foot lifting lever 6 is hinged with the presser foot lifting pull rod 8, and the bottom end of the presser foot lifting lever 6 is rotatably connected with a presser foot lifting rolling member 7. The presser foot lifting pull rod 8 enables the presser foot lifting rolling piece 7 to always abut against the presser foot lifting cam 3 under the action of the presser foot spring 10 and the high-level front lever 9. Along with the rotation of the presser foot lifting cam 3, the presser foot lifting rolling element 7 can be abutted against the abutted end surface or the presser foot lifting surface 3a1 or the presser foot lifting holding surface 3a2, the presser foot lifting lever 6 swings, the presser foot lifting pull rod 8 is pulled, the high-level front lever 9 is inclined backwards against the presser foot spring 10, and the presser foot is lifted.
As shown in fig. 1 to 4, when the stitch length adjusting roller 5 is positioned in the stitch length adjusting section 2a1, the end surface of the presser foot lifting cam 3 is abutted by the presser foot lifting roller 7, and when the stitch length adjusting roller 5 is positioned in the stitch length holding section 2a2, the presser foot lifting roller 7 is abutted by the presser foot lifting surface 3a1 or the presser foot lifting holding surface 3a 2. Specifically, when the stitch length adjusting roller 5 approaches the closed end 2a3 on the end of the stitch length holding section 2a2, the presser foot lifting roller 7 abuts against the presser foot lifting holding surface 3a 2.
In this embodiment, lift the presser foot lever 6 and act on and exert along the pivot 1a axial on the presser foot cam 3, compare in prior art, this application can prevent that the pivot 1a of rotary drive source 1 from further producing the circle and beat the error, ensure the cooperation precision between cam groove 2a and the needle pitch adjustment rolling member 5 to reduce the influence to the needle pitch adjustment precision, this application has realized lifting the presser foot and adjusting the influence to the needle pitch adjustment precision when the needle pitch function realizes controlling through a rotary drive source 1.
As shown in fig. 1 to 4, in this embodiment, the rotary driving source 1 may be connected to a controller of the sewing machine, the controller controls the forward rotation or the reverse rotation or the stop of the rotary driving source 1 according to the working requirement of the sewing machine, and the controller controls the rotation angle of the rotary driving source 1, thereby controlling the positional relationship of the stitch length adjusting roller 5 in the cam groove 2a, and also controlling the positional relationship between the presser foot lifting roller 7 and the presser foot lifting bump 3a, so as to realize the presser foot lifting and stitch length adjusting control. The controller can be a PLC or a singlechip which is arranged independently, and can also be a control system of the sewing machine.
The working process of the needle distance adjusting and presser foot lifting device of the sewing machine in the embodiment is as follows:
as shown in fig. 1 to 4, when the sewing machine is ready to start operation, the rotation driving source 1 drives the presser foot lifting cam 3 to rotate, so that the presser foot lifting rolling member 7 is abutted against the presser foot lifting holding surface 3a2 or the presser foot lifting surface 3a1 to lift the presser foot. At this time, the stitch length adjusting roller 5 is positioned in the stitch length holding section 2a2, and the stitch length of the sewing machine is held at the maximum value. After the cloth is placed, the rotary driving source 1 drives the presser foot lifting cam 3 to rotate, the presser foot lifting rolling element 7 is abutted against the end face of the presser foot lifting cam 3, the presser foot presses the cloth to be sewn, meanwhile, the controller controls the rotary driving source 1 to drive the needle pitch adjusting cam 2 and the presser foot lifting cam 3 to continue rotating, and the position of the needle pitch adjusting rolling element 5 in the needle pitch adjusting section 2a1 is adjusted according to the set needle pitch, so that needle pitch adjustment is realized. When the stitch length adjustment is completed, the rotation driving source 1 stops rotating. When the needle pitch adjusting roller 5 is in the needle pitch adjusting section 2a1, the presser foot lifting roller 7 always abuts against the end face of the presser foot lifting cam 3.
When the presser foot is required to be lifted in the sewing process of the sewing machine, the rotary driving source 1 drives the presser foot lifting cam 3 and the stitch length adjusting cam 2 to rotate, so that the presser foot lifting rolling element 7 is abutted against the presser foot lifting holding surface 3a2 or the presser foot lifting surface 3a1 to lift the presser foot, and the stitch length adjusting rolling element 5 enters the stitch length holding section 2a2. The size of the needle distance before the presser foot is lifted is memorized by the controller, after the presser foot falls down, the controller drives the presser foot lifting cam 3 and the needle distance adjusting cam 2 to rotate the position before the presser foot is lifted, and when the needle distance adjustment is completed, the rotation of the rotary driving source 1 is stopped.
When the sewing machine finishes the sewing work, the rotary driving source 1 drives the presser foot lifting cam 3 and the needle pitch adjusting cam 2 to rotate, so that the presser foot lifting rolling piece 7 is abutted against the presser foot lifting holding surface 3a2 or the presser foot lifting surface 3a1, and after the presser foot is lifted, the rotary driving source 1 stops rotating.
The presser foot lifting lever 6 in the application is abutted against the end face of the presser foot lifting cam 3 through the presser foot lifting rolling piece 7, so that the force of the presser foot lifting lever 6 acting on the presser foot lifting cam 3 is applied along the axial direction of the rotating shaft 1 a; because the presser foot lifting cam 3 and the stitch length adjusting cam 2 are arranged on the rotating shaft 1a in a split manner, when the presser foot lifting function fails, the presser foot lifting function can be recovered to be normal by independently adjusting the presser foot lifting cam 3, and the stitch length adjusting cam 2 is not influenced; when the stitch length adjustment deviates, the stitch length adjustment precision can be recovered by independently adjusting the stitch length adjustment cam 2, and the presser foot lifting cam 3 is not influenced.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (8)
1. The needle pitch adjusting and presser foot lifting device of the sewing machine comprises a rotary driving source (1), a needle pitch adjusting connecting rod (4) and a presser foot lifting lever (6), wherein a rotating shaft (1 a) is arranged on the rotary driving source (1), a needle pitch adjusting cam (2) is sleeved on the rotating shaft (1 a), a cam groove (2 a) is formed in the needle pitch adjusting cam (2), the needle pitch adjusting connecting rod (4) is provided with a needle pitch adjusting rolling element (5) which is positioned in the cam groove (2 a) and abuts against the groove wall of the cam groove (2 a), and the needle pitch adjusting device is characterized in that the rotating shaft (1 a) is also sleeved with a presser foot lifting cam (3), the presser foot lifting lever (6) is provided with a presser foot lifting rolling element (7) which abuts against the end surface of the presser foot lifting cam (3), the end surface of the presser foot lifting cam (3) is convexly provided with a presser foot lifting surface (3 a 1) which can abut against the presser foot lifting rolling element (7), and when the presser foot lifting rolling element (7) abuts against the lifting surface (3 a 1); the needle distance adjusting connecting rod (4) comprises a first rod body (4 a) and a second rod body (4 b), the end parts of the first rod body (4 a) and the second rod body (4 b) are mutually hinged, the other end of the first rod body (4 a) is hinged to a feeding swing plate seat (11) of the sewing machine, the other end of the second rod body (4 b) is hinged to a shell of the sewing machine, and the needle distance adjusting rolling part (5) is rotationally connected to a hinging point of the first rod body (4 a) and the second rod body (4 b) which are mutually hinged.
2. The needle pitch adjusting and presser foot lifting device of the sewing machine according to claim 1, wherein a presser foot lifting lug (3 a) is convexly arranged on the end face of the presser foot lifting cam (3), the presser foot lifting surface (3 a 1) is positioned on the presser foot lifting lug (3 a), one end of the presser foot lifting surface (3 a 1) is connected with the end face of the presser foot lifting cam (3) in a coplanar manner, and a distance is reserved between the other end of the presser foot lifting surface (3 a 1) and the end face of the presser foot lifting cam (3).
3. Needle pitch adjusting and presser foot lifting device of a sewing machine according to claim 2, characterized in that the presser foot lifting projection (3 a) is further provided with a presser foot lifting holding surface (3 a 2) capable of being abutted against the presser foot lifting rolling element (7), the presser foot lifting holding surface (3 a 2) is parallel to the end face of the presser foot lifting cam (3), and the presser foot lifting holding surface (3 a 2) is connected with the other end of the presser foot lifting surface (3 a 1).
4. A stitch length adjusting and presser foot lifting device of a sewing machine according to claim 1, 2 or 3, characterized in that the cam groove (2 a) comprises a stitch length adjusting section (2 a 1) and a stitch length holding section (2 a 2), when the stitch length adjusting rolling element (5) is positioned in the stitch length adjusting section (2 a 1), the end face of the presser foot lifting cam (3) is abutted by the presser foot lifting rolling element (7), when the stitch length adjusting rolling element (5) is positioned in the stitch length holding section (2 a 2), the presser foot lifting rolling element (7) is abutted by the presser foot lifting face (3 a 1) or the presser foot lifting holding face (3 a 2).
5. The stitch length adjusting and presser foot lifting device of a sewing machine according to claim 4, characterized in that the cam groove (2 a) has two closed ends (2 a 3) respectively located on the end of the stitch length adjusting section (2 a 1) and the end of the stitch length holding section (2 a 2), and a space is provided between the two closed ends (2 a 3).
6. The stitch length adjusting and presser foot lifting device of a sewing machine according to claim 5, wherein a distance between the stitch length adjusting section (2 a 1) and a rotation center of the stitch length adjusting cam (2) is gradually reduced, corresponding stitch length is gradually reduced, the stitch length holding section (2 a 2) and the rotation center of the stitch length adjusting cam (2) are concentrically arranged, and corresponding stitch length is kept at a maximum value.
7. The needle distance adjusting and presser foot lifting device of the sewing machine according to claim 5, wherein the sewing machine comprises a machine shell, the presser foot lifting lever (6) is hinged on the machine shell, the top end of the presser foot lifting lever (6) is hinged with a presser foot lifting pull rod (8), and the presser foot lifting rolling member (7) is rotatably connected to the bottom end of the presser foot lifting lever (6).
8. The stitch length adjusting and presser foot lifting device of a sewing machine according to claim 4, wherein the rotary driving source (1) is a stepping motor or a servo motor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110174687.0A CN113005647B (en) | 2021-02-07 | 2021-02-07 | Needle distance adjusting and presser foot lifting device of sewing machine |
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| CN202110174687.0A CN113005647B (en) | 2021-02-07 | 2021-02-07 | Needle distance adjusting and presser foot lifting device of sewing machine |
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| CN113005647A CN113005647A (en) | 2021-06-22 |
| CN113005647B true CN113005647B (en) | 2023-04-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4418812B2 (en) * | 2006-10-26 | 2010-02-24 | Ｊｕｋｉ株式会社 | sewing machine |
| CN111501223B (en) * | 2019-01-31 | 2022-01-11 | 浙江杰克智能缝制科技有限公司 | Cam wheel |
| CN111501217B (en) * | 2019-01-31 | 2022-01-11 | 浙江杰克智能缝制科技有限公司 | Sewing machine and device for lifting presser foot and adjusting needle pitch of sewing machine |
| CN112048838B (en) * | 2019-06-05 | 2022-02-22 | 杰克科技股份有限公司 | Sewing machine |
| CN111593497A (en) * | 2020-05-29 | 2020-08-28 | 浙江广和缝纫机有限公司 | Sewing machine |
| CN111719253A (en) * | 2020-07-25 | 2020-09-29 | 琦星智能科技股份有限公司 | Structure for controlling multiple sewing actions by one motor and sewing machine |
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