CN213804307U - Driving structure of sewing machine - Google Patents
Driving structure of sewing machine Download PDFInfo
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- CN213804307U CN213804307U CN202022539065.7U CN202022539065U CN213804307U CN 213804307 U CN213804307 U CN 213804307U CN 202022539065 U CN202022539065 U CN 202022539065U CN 213804307 U CN213804307 U CN 213804307U
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Abstract
The utility model provides a sewing machine's drive structure belongs to sewing machine technical field. It has solved the problem that can not intermittent type nature action. This sewing machine's drive structure includes the motor, drive cam and driving medium, drive cam's center is fixed in the pivot of motor, the driving medium supports and leans on drive cam's lateral wall, drive cam is the rhombus form, drive cam's lateral wall includes two idle stroke faces and two working faces, two idle stroke faces are outside convex arc surface, two idle stroke faces are located same circumference and the centre of a circle of two idle stroke faces is located drive cam's central axis, two idle stroke faces are in the obtuse angle department of rhombus, two working faces are connected respectively between two idle stroke faces and two working face symmetry sets up. The driving structure of the sewing machine can enable the driven mechanism to realize intermittent actions of working, static, working and static in the process that the motor rotates for a circle, and has the advantages of strong reliability, high matching precision and the like.
Description
Technical Field
The utility model belongs to the technical field of sewing machine, a drive structure of sewing machine is related to.
Background
A sewing machine is a machine that uses one or more sewing threads to form one or more stitches in a material to be sewn, thereby interweaving or stitching one or more layers of material. A plurality of mechanisms are arranged in the sewing machine, and the sewing materials are sewn through the reasonable matching of the movement of each mechanism and the circular work. The conventional sewing machine is internally provided with a driving structure which can drive the mechanisms to automatically work.
For example, the sewing machine and the automatic presser foot lifting mechanism disclosed in the Chinese patent with application number 201822007003.4 comprise a presser foot lifting transmission mechanism, a motor and a presser foot lifting cam driven by the motor to rotate, wherein the presser foot lifting cam comprises a presser foot lifting part and an idle stroke part, the presser foot lifting transmission mechanism is in contact connection with the outer wall of the presser foot lifting cam through a roller, and the action of the motor is controlled by a controller. The motor drives the pressure foot lifting cam to rotate, and when the roller is contacted with the idle stroke part on the pressure foot lifting cam, the pressure foot lifting cam keeps still; when the pressure raising foot cam rotates until the pressure raising foot part is contacted with the roller, the pressure raising foot can be automatically raised upwards along with the further rotation of the motor, and the pressure raising foot is raised to the highest position when the top point of the pressure raising foot part is contacted with the roller. However, it also has some disadvantages: the presser foot lifting cam can only complete one-time driving work within one circle of rotation of the motor, and intermittent actions such as driving, idle stroke, driving and idle stroke cannot be completed within one circle of rotation of the motor, so that long waiting time exists, and the sewing machine cannot continuously work.
Disclosure of Invention
The utility model aims at the above-mentioned problem that prior art exists, provide a drive structure of sewing machine, solved the problem that can not intermittent type nature action.
The purpose of the utility model can be realized by the following technical proposal:
the driving structure of the sewing machine comprises a motor, a driving cam and a transmission piece, wherein the center of the driving cam is fixed on a rotating shaft of the motor, the transmission piece is abutted against the outer side wall of the driving cam, the driving cam is rhombic, the outer side wall of the driving cam comprises two idle stroke surfaces and two working surfaces, the two idle stroke surfaces are arc surfaces protruding outwards, the two idle stroke surfaces are positioned on the same circumference, the circle centers of the two idle stroke surfaces are positioned on the central axis of the driving cam, the two idle stroke surfaces are positioned at the obtuse angle of the rhombus, the two working surfaces are respectively connected between the two idle stroke surfaces and are symmetrically arranged, the two working surfaces protrude out of the circumference where the two idle stroke surfaces are positioned, the working surfaces comprise two working sections which are straight surfaces and arc transition sections which are connected between the two working sections, and the idle stroke surfaces and the arc transition sections are tangent to the corresponding working sections.
The driving cam center is fixed on the rotating shaft of the motor, and the transmission part is abutted against the outer side wall of the driving cam. When the transmission piece is positioned at the idle stroke surface, the idle stroke surface is an arc surface, and the circle center of the idle stroke surface is positioned on the central axis of the driving cam, so that the driving cam executes the idle stroke along with the rotation of the motor rotating shaft, namely, the transmission piece is kept still, the phenomenon that the transmission piece acts in wrong time to interfere with the action of other parts of the sewing machine is avoided, and the sewing machine can be ensured to finish sewing work according to required steps; when the motor drives the driving cam to rotate until the working surface is contacted with the end part of the transmission piece, the working surface protrudes out of the circumference of the two idle stroke surfaces, which means that the working surface can drive the transmission piece to swing or lift upwards along with the continuous rotation of the motor, thereby completing corresponding actions. In particular, during driving, the contact between the transmission element and the working surface is transferred from one of the working sections to the other working section. In the process of contacting with the initial working section, along with the rotation of the motor rotating shaft, the driving force is generated to the transmission piece through the inclination of the working section, so that the transmission piece swings or is lifted upwards, and the corresponding mechanism completes one action. When the motor rotating shaft rotates until the transmission piece is contacted with the other working section, the transmission piece is not driven by driving force any more, and the transmission piece and the corresponding mechanism reset under the action of the self resetting component. When the motor shaft rotates reversely, the above process is repeated.
The driving cam is provided with two working faces and two idle stroke faces, and the two working faces are connected between the two idle stroke faces, so that the driven mechanism can realize intermittent actions of working, stillness, working and stillness in the process that the motor rotates for a circle. Through setting up two working segments to the slope opposite direction for the motor homoenergetic when just, the reversal accomplishes the drive, cooperates the setting of two idle stroke faces again, has guaranteed corotation a week or has reversed homoenergetic in a week and accomplish intermittent type nature action. Especially, when at least two driving cams are matched and used on a rotating shaft of a motor (such as one driving thread cutting mechanism and the other driving pressure foot lifting mechanism), the sewing machine can continuously complete various actions only by staggering the working surfaces on the driving cams according to a certain angle and matching with the intermittent action realized by the driving cams.
In the driving structure of the sewing machine, the driving cam comprises a body and a first mounting head protruding out of one side of the body, a sleeving hole penetrating through the body and the first mounting head is formed in the driving cam, the driving cam is sleeved on a rotating shaft of the motor through the sleeving hole, a first connecting hole is formed in the side portion of the first mounting head in a penetrating mode, and an end portion of the first connecting hole is connected with a fastener in the rotating shaft of the motor in an abutting mode.
During assembly, the driving cam is sleeved on the rotating shaft of the motor through the sleeving hole, and then the fastening piece in the first connecting hole in threaded connection is screwed, so that the end part of the fastening piece is abutted against the rotating shaft of the motor to fix the driving cam. The connection mode can adjust the position of the driving cam on the motor rotating shaft and the initial contact position of the transmission piece and the driving cam, ensure the matching precision and ensure the reliability of the intermittent action.
In the above-mentioned drive structure of sewing machine, the sewing machine include the trimming mechanism, the trimming mechanism include the trimming drive shaft that moves the tool holder and one end and move the tool holder and be connected, the trimming drive shaft parallels with the pivot of motor, the driving medium is the trimming crank, trimming crank one end is connected with the trimming drive shaft other end, trimming crank other end lateral part has the plush copper, the plush copper supports and leans on the lateral wall of body.
The raised head at the side part of the trimming crank is abutted against the outer side wall of the body, and when the motor drives the driving cam to rotate until the raised head is positioned at the idle stroke surface, the trimming crank does not swing so as to keep the trimming mechanism still; when the motor drives the driving cam to rotate until the raised head and the working section start to contact, the thread cutting crank starts to swing, and the thread cutting driving shaft rotates to enable the thread cutting knife rest to swing, so that thread cutting work is completed. In the process that the motor rotates for one circle, two working faces on the driving cam are matched with the thread trimming crank, so that intermittent action of the thread trimming mechanism is realized.
In the above-mentioned drive structure of sewing machine, as another kind of technical scheme, sewing machine including lifting the presser foot mechanism, lift the presser foot mechanism and include the presser foot, the driving medium includes the ejector pin and fixes the connector at the ejector pin lower extreme, the ejector pin upper end and the presser foot linkage, the connector lateral part has the lug, lug one side is equipped with the gyro wheel, the gyro wheel supports and leans on the lateral wall of body.
The roller abuts against the outer side wall of the body, and when the motor drives the driving cam to rotate until the roller is positioned on the idle stroke surface, the ejector rod cannot be lifted upwards to keep the presser foot still; when the motor drives the driving cam to rotate until the roller is in contact with the working section, the ejector rod starts to be lifted upwards, so that the presser foot is linked to be lifted upwards, and when the roller is arranged from the working section to the arc transition section, the presser foot is lifted to the highest position. In the process that the motor rotates for one circle, two working faces on the driving cam are matched with the ejector rod, so that intermittent action of the presser foot lifting mechanism is realized.
In the driving structure of the sewing machine, the driving cam further comprises a second mounting head protruding out of the other side of the body, the sleeving hole penetrates through the second mounting head, and a second connecting hole with threads is formed in the side part of the second mounting head in a penetrating mode.
On the basis that a motor is used as a driving source to drive the presser foot lifting mechanism to work, the backstitch function is also realized only by inserting a connecting rod at the second mounting head of the driving cam (the connecting rod and the driving cam are fixed by a threaded connecting fastener in the second connecting hole), then installing a cam capable of driving a swinging seat in the backstitch mechanism in the sewing machine on the connecting rod, and ensuring that the working position on the cam for driving the swinging seat to swing and the working surface on the driving cam are staggered by an angle.
Compared with the prior art, the driving structure of the sewing machine has the following advantages:
1. by arranging the two working surfaces and the two idle stroke surfaces, the two working surfaces are connected between the two idle stroke surfaces, the two working surfaces are positioned on the same circumference, and the two idle stroke surfaces are symmetrically arranged, so that the driving cam can realize intermittent actions such as driving, idle stroke, driving and idle stroke in the process of one rotation of the motor, and the sewing machine can be ensured to continuously finish all actions;
2. the working surface comprises two working sections, so that the motor can realize intermittent action in the process of rotating forwards for one circle or rotating backwards for one circle.
Drawings
FIG. 1 is a schematic view of a first embodiment of a driving structure of the sewing machine.
Fig. 2 is a schematic perspective view of a driving cam in the first embodiment.
Fig. 3 is a plan view of the drive cam.
FIG. 4 is a schematic view of a second embodiment of the driving structure of the sewing machine.
Fig. 5 is a schematic view of the engagement between the driving cam and the jack in the second embodiment.
Fig. 6 is a schematic perspective view of a drive cam in the second embodiment.
The plan view of the driving cam in the first embodiment of the driving structure of the sewing machine is schematically shown.
In the figure, 1, a motor; 2. a drive cam; 2a, a body; 2a1, work surface; 2a11, working section; 2a12, arc transition; 2a2, idle stroke face; 2b, sleeving holes; 2c, mounting the first head; 2c1, connecting hole one; 2d, mounting a second head; 3. a movable knife rest; 4. a thread trimming drive shaft; 5. a thread cutting crank; 5a, a raised head; 6. a presser foot; 7. a top rod; 8. a connector; 8a, a tab; 8b and a roller.
Detailed Description
The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
Example one
As shown in fig. 1, 2 and 3, the driving structure of the sewing machine includes a motor 1, a driving cam 2 and a transmission member, wherein the center of the driving cam 2 is fixed on the rotating shaft of the motor 1, and the transmission member abuts against the outer side wall of the driving cam 2. The driving cam 2 is in a diamond shape, the outer side wall of the driving cam 2 comprises two idle stroke surfaces 2a2 and two working surfaces 2a1, the two idle stroke surfaces 2a2 are both arc surfaces protruding outwards, the two idle stroke surfaces 2a2 are located on the same circumference, the circle centers of the two idle stroke surfaces 2a2 are located on the central axis of the driving cam 2, and the two idle stroke surfaces 2a2 are located at the obtuse angle of the diamond. The two working surfaces 2a1 are respectively connected between the two idle stroke surfaces 2a2, the two working surfaces 2a1 are symmetrically arranged, the two working surfaces 2a1 protrude out of the circumference where the two idle stroke surfaces 2a2 are located, the working surfaces 2a1 comprise two working sections 2a11 which are straight surfaces and an arc transition section 2a12 connected between the two working sections 2a11, and the idle stroke surfaces 2a2 and the arc transition section 2a12 are tangent to the corresponding working sections 2a 11.
Further, as shown in fig. 2, the driving cam 2 includes a body 2a and a first mounting head 2c protruding from one side of the body 2a, wherein the first mounting head 2c and the body 2a are of an integral structure. The driving cam 2 is provided with a sleeving hole 2b penetrating through the body 2a and the first mounting head 2c, the driving cam 2 is sleeved on a rotating shaft of the motor 1 through the sleeving hole 2b, the side part of the first mounting head 2c is provided with a connecting hole 2c1 in a penetrating mode, and the inner thread of the first connecting hole 2c1 is connected with a fastener of which the end part is pressed against the rotating shaft of the motor 1. During assembly, the driving cam 2 is sleeved on the rotating shaft of the motor 1 through the sleeving hole 2b, then the fastener in the connecting hole one 2c1 in threaded connection is screwed, and the end part of the fastener is abutted on the rotating shaft of the motor 1 to fix the driving cam 2. The connection mode can adjust the position of the driving cam 2 on the rotating shaft of the motor 1 and the initial contact position of the transmission piece and the driving cam 2, and ensures the matching precision.
Specifically, as shown in fig. 1, the sewing machine includes a thread trimming mechanism, the thread trimming mechanism includes a movable knife rest 3 and a thread trimming driving shaft 4 having one end connected to the movable knife rest 3, the thread trimming driving shaft 4 is parallel to a rotating shaft of the motor 1, a driving member is a thread trimming crank 5, one end of the thread trimming crank 5 is connected to the other end of the thread trimming driving shaft 4, a protruding head 5a is provided at a side portion of the other end of the thread trimming crank 5, and the protruding head 5a abuts against an outer side wall of the body 2 a. When the motor 1 drives the driving cam 2 to rotate until the raised head 5a is positioned on the idle stroke surface 2a2, the thread trimming crank 5 is kept still and the thread trimming mechanism does not work because the idle stroke surface 2a2 is a circular arc surface. When the rotating shaft of the motor 1 rotates until the idle stroke surface 2a2 is separated from the projection 5a, the projection 5a comes into contact with the working section 2a11 on the working surface 2a1, and as the rotating shaft of the motor 1 further rotates, the working section 2a11 applies thrust to the trimming crank 5 through the projection 5a, so that the trimming crank 5 swings and the movable knife rest 3 is driven to swing through the trimming drive shaft 4. When the driving cam 2 rotates to the position that the raised head 5a is at the arc transition section 2a12, the swing amplitude of the movable knife rest 3 reaches the maximum to complete the thread cutting action. When the motor 1 continues to rotate until the nose 5a passes through the arc transition section 2a12 and through the other working section 2a11 and finally reaches the other idle stroke surface 2a2, the thread trimming mechanism is gradually reset to the initial state. The two working sections 2a11 and the arc transition section 2a12 are arranged, so that the thread cutting mechanism can cut threads when the motor 1 rotates reversely.
Example two
As shown in fig. 4 and 5, the sewing machine includes a presser foot lifting mechanism, the presser foot lifting mechanism includes a presser foot 6, the transmission member includes a push rod 7 and a connector 8 fixed at the lower end of the push rod 7, the upper end of the push rod 7 is linked with the presser foot 6 (the linkage of the push rod 7 and the presser foot 6 is the prior art, and is not described herein any more), the side part of the connector 8 has a lug 8a, one side of the lug 8a is provided with a roller 8b, and the roller 8b abuts against the outer side wall of the body 2 a. When the motor 1 drives the driving cam 2 to rotate until the roller 8b is located at the idle stroke surface 2a2, the push rod 7 is kept still and the presser foot 6 is not lifted because the idle stroke surface 2a2 is a circular arc surface. When the rotating shaft of the motor 1 rotates until the roller 8b comes into contact with the working section 2a11 on the working surface 2a1, the driving cam 2 will gradually jack up the mandril 7 through the working section 2a11 with the further rotation of the rotating shaft of the motor 1, and the presser foot 6 is lifted upwards, and the contact with different positions on the working section 2a11 means that the presser foot 6 is lifted up by different heights. When the drive cam 2 is rotated until the roller 8b contacts the circular arc transition section 2a12, the presser foot 6 is raised to a maximum height. When the motor 1 continues to rotate until the roller 8b passes through the arc transition section 2a12 and through the other working section 2a11 and finally contacts the other idle stroke surface 2a2, the presser foot 6 is lowered to the initial state. The two working sections 2a11 and the arc transition section 2a12 are arranged, so that the presser foot lifting mechanism can lift the presser foot 6 when the motor 1 rotates reversely. If one motor 1 is used as a driving source to drive the thread trimming mechanism and the presser foot lifting mechanism to work, only two driving cams 2 are fixed on a rotating shaft of the motor 1 at the same time, and idle stroke surfaces 2a2 on the two driving cams 2 are arranged in a staggered mode.
Further, as shown in fig. 6, the driving cam 2 in this embodiment further includes a second mounting head 2d protruding from the other side of the body 2a, the sleeve hole 2b penetrates through the second mounting head 2d, and a connecting hole 2d1 with a thread is formed in a side portion of the second mounting head 2 d. On the basis that the motor 1 is used as a driving source to drive the thread trimming mechanism and the presser foot lifting mechanism to work simultaneously, the backstitch function is realized only by inserting a connecting rod at the mounting head II 2d of the driving cam 2 (the connecting rod is fixed with the driving cam 2 by a threaded connection fastener in the connecting hole II 2d1), and then installing a cam capable of driving a swinging seat in the backstitch mechanism in the sewing machine to swing on the connecting rod.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (5)
1. The driving structure of the sewing machine comprises a motor (1), a driving cam (2) and a transmission piece, wherein the center of the driving cam (2) is fixed on a rotating shaft of the motor (1), the transmission piece is abutted against the outer side wall of the driving cam (2), the driving cam (2) is in a diamond shape, the outer side wall of the driving cam (2) comprises two idle stroke surfaces (2a2) and two working surfaces (2a1), the two idle stroke surfaces (2a2) are arc surfaces protruding outwards, the two idle stroke surfaces (2a2) are positioned on the same circumference, the circle centers of the two idle stroke surfaces (2a2) are positioned on the central axis of the driving cam (2), the two idle stroke surfaces (2a2) are positioned at an obtuse angle of the diamond shape, the two working surfaces (2a1) are respectively connected between the two idle stroke surfaces (2a2) and the two working surfaces (2a1) are symmetrically arranged, and the two working surfaces (2a1) protrude out of the circumference where the two idle stroke surfaces (2a2) are positioned, the working surface (2a1) comprises two working sections (2a11) which are straight surfaces and an arc transition section (2a12) connected between the two working sections (2a11), and the idle stroke surface (2a2) and the arc transition section (2a12) are tangent to the corresponding working sections (2a 11).
2. The driving structure of the sewing machine according to claim 1, wherein the driving cam (2) comprises a body (2a) and a first mounting head (2c) protruding from one side of the body (2a), the driving cam (2) is provided with a sleeve hole (2b) penetrating through the body (2a) and the first mounting head (2c), the driving cam (2) is sleeved on the rotating shaft of the motor (1) through the sleeve hole (2b), the side part of the first mounting head (2c) is provided with a first connecting hole (2c1) in a penetrating way, and the first connecting hole (2c1) is internally connected with a fastener of which the end part is pressed against the rotating shaft of the motor (1).
3. The driving structure of the sewing machine according to claim 2, wherein the sewing machine comprises a thread trimming mechanism, the thread trimming mechanism comprises a movable knife rest (3) and a thread trimming driving shaft (4) with one end connected with the movable knife rest (3), the thread trimming driving shaft (4) is parallel to a rotating shaft of the motor (1), a driving part is a thread trimming crank (5), one end of the thread trimming crank (5) is connected with the other end of the thread trimming driving shaft (4), a raised head (5a) is arranged on the side part of the other end of the thread trimming crank (5), and the raised head (5a) abuts against the outer side wall of the body (2 a).
4. The driving structure of the sewing machine according to claim 2, characterized in that the sewing machine comprises a presser foot lifting mechanism, the presser foot lifting mechanism comprises a presser foot (6), the transmission member comprises a mandril (7) and a connector (8) fixed at the lower end of the mandril (7), the upper end of the mandril (7) is linked with the presser foot (6), a convex piece (8a) is arranged at the side part of the connector (8), a roller (8b) is arranged at one side of the convex piece (8a), and the roller (8b) is abutted against the outer side wall of the body (2 a).
5. The driving structure of the sewing machine according to claim 4, wherein the driving cam (2) further comprises a second mounting head (2d) protruding from the other side of the body (2a), the sleeving hole (2b) penetrates through the second mounting head (2d), and a second threaded connecting hole (2d1) is formed in the side portion of the second mounting head (2 d).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022539065.7U CN213804307U (en) | 2020-11-05 | 2020-11-05 | Driving structure of sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022539065.7U CN213804307U (en) | 2020-11-05 | 2020-11-05 | Driving structure of sewing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213804307U true CN213804307U (en) | 2021-07-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022539065.7U Active CN213804307U (en) | 2020-11-05 | 2020-11-05 | Driving structure of sewing machine |
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| CN (1) | CN213804307U (en) |
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2020
- 2020-11-05 CN CN202022539065.7U patent/CN213804307U/en active Active
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Address after: 317604 Pu Qing Dou Men Tou Cun, Yuhuan City, Taizhou City, Zhejiang Province Patentee after: Qixing Intelligent Technology Co.,Ltd. Address before: 317604 Nanyou Industrial Zone, Damaiyu Development Zone, Yuhuan City, Taizhou City, Zhejiang Province Patentee before: Qixing Intelligent Technology Co.,Ltd. |