CN218321901U - Balance crank, sewing machine head and sewing machine - Google Patents
Balance crank, sewing machine head and sewing machine Download PDFInfo
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- CN218321901U CN218321901U CN202220344112.9U CN202220344112U CN218321901U CN 218321901 U CN218321901 U CN 218321901U CN 202220344112 U CN202220344112 U CN 202220344112U CN 218321901 U CN218321901 U CN 218321901U
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Abstract
The utility model relates to a balance crank, sewing machine head and sewing machine, which comprises a rotary block and an eccentric block connected with the rotary block, wherein the gravity center of the eccentric block deviates from the rotary center of the rotary block, and the rotary block is provided with a bearing installation part adaptive to a bearing; the balance crank can solve the structural limitation of the existing balance crank, so that the bearings for supporting the transmission shaft can be respectively arranged on the two sides of the balance crank, the transmission requirement of a driving system can be met, the bearings can be arranged at the positions closer to the needle rod, the turning radius of the machine head can be reduced, the turning radius of the whole machine head is smaller, and the high-speed rotation of the machine head is facilitated; but also can improve the stress of the bearing, and has the effects of protecting the bearing, reducing noise and prolonging the service life of the bearing.
Description
Technical Field
The utility model relates to a sewing machine technical field, concretely relates to sewing machine aircraft nose and sewing machine.
Background
Sewing machines are commonly used sewing machines, which generally make use of one or more sewing threads to form one or more stitches in the material to be sewn, to interlace or stitch together one or more layers of material; the sewing machine can sew fabrics such as cotton, hemp, silk, wool, artificial fiber and the like and products such as leather, plastic, paper and the like, and the sewed stitch is neat, beautiful, flat and firm, has high sewing speed and simple and convenient use, and is widely applied in the sewing industry.
At present, the types of sewing machines are various, but the sewing machines with various structures generally comprise an upper machine head, a lower machine head matched with the upper machine head and a sewing platform for placing sewing materials, wherein the upper machine head is the main part of the sewing machine and generally comprises four mechanisms of material puncturing, thread hooking, thread taking and feeding and auxiliary mechanisms of winding, material pressing, tooth falling and the like, and the upper machine head is generally arranged above the sewing platform; the lower head usually includes a rotating shuttle mechanism, and the rotating shuttle mechanism is usually disposed on the sewing platform at a position corresponding to the upper head, so that the rotating shuttle mechanism can be matched with the upper head (specifically, matched with the needle bar of the upper head) to smoothly complete the sewing operation.
A computer sewing machine (or referred to as a 360-degree rotation perfect stitch sewing machine, a computer pattern template sewing machine) with a head capable of rotating 360 degrees is a kind of sewing machine, and is also a commonly used sewing machine, an upper head of the sewing machine can rotate, and the upper head is generally provided with a needle bar and a driving system for driving the needle bar to ascend/descend, the needle bar is vertically arranged on the upper head, the driving system generally comprises a motor, a transmission mechanism, a transmission shaft, a balance crank (or referred to as a balance block), a crankshaft (or referred to as a crank), a transmission arm, a transmission rod and a vertical guiding mechanism, as shown in fig. 1, wherein the transmission shaft is generally connected to a frame through two bearings, the motor is in transmission connection with the transmission shaft through the transmission mechanism for driving the transmission shaft to rotate, the balance crank is generally connected to one end of the transmission shaft, the crankshaft is eccentrically connected to the balance crank (i.e., the rotation center of the crankshaft deviates from the rotation center of the transmission shaft), the upper end of the transmission arm is rotatably connected to the crankshaft, the lower end of the transmission rod is generally horizontally arranged, one end of the transmission rod is vertically connected to the needle bar, and the vertical guiding mechanism is used for guiding the movement of the transmission rod along the vertical direction; in actual operation, the driving system can drive the transmission shaft to rotate so as to achieve the purpose of driving the needle rod to ascend/descend along the vertical direction; for the whole upper machine head, the needle rod is usually positioned at the position of the rotation center of the upper machine head, and the upper machine head can rotate, so that the rotation radius of the upper machine head needs to be reduced as much as possible, however, by adopting the existing driving system, due to the structural limitation of the balance crank, the bearings for supporting the transmission shaft can only be arranged at the same side of the balance crank, as shown in fig. 1, on one hand, the bearing for supporting the transmission shaft can only be positioned at the position far away from the needle rod, so that the rotation radius of the whole upper machine head is increased, and the high-speed rotation of the upper machine head is not facilitated; on the other hand, the bearing is subjected to a large unbalance load, so that the bearing is easy to wear, has large noise and is shortened in service life, and a solution is urgently needed.
Disclosure of Invention
The utility model aims to solve the problem that in the existing sewing machine driving system, because of the structural limitation of the balance crank, the bearings for supporting the transmission shaft can only be arranged at the same side of the balance crank, so that the bearings for supporting the transmission shaft can only be positioned at the position far away from the needle bar, the turning radius of the whole upper machine head is increased, and the high-speed rotation of the upper machine head is not facilitated; and lead to the bearing to receive very big unbalance loading, make the bearing easily wear out, the big and life reduction's of noise problem, a more reasonable balance crank of design is provided, not only can satisfy actuating system's transmission demand, and can install the bearing in balance crank, make when this balance crank is applied to actuating system, the bearing can be installed in the position department that is closer to the needle bar, thereby can reduce the radius of gyration of aircraft nose, and can improve the atress of bearing, be favorable to protecting the bearing, reduce the noise, and prolong the life of bearing, the main conception is:
a balance crank comprises a rotary block and an eccentric block connected to the rotary block, wherein the gravity center of the eccentric block deviates from the rotary center of the rotary block, and the rotary block is provided with a bearing mounting part matched with a bearing. In the scheme, the gravity center of the eccentric block deviates from the rotation center of the rotation block, so that in the driving system, when the motor drives the rotation block and the eccentric block to synchronously rotate around the rotation center of the rotation block, the eccentric block can play a balance role; the bearing mounting part of the adaptive bearing is constructed on the rotary block, so that in the assembly process, the inner ring of the bearing can be directly assembled on one side of the balance crank, the effect of supporting the balance crank can be achieved, the effect of supporting the transmission shaft can be achieved, the other bearing for supporting the transmission shaft only needs to be installed on the transmission shaft, and at the moment, the two bearings for supporting the transmission shaft just can be respectively positioned on the two sides of the balance crank; the balance crank with the structure can solve the structural limitation of the existing balance crank, so that the bearings for supporting the transmission shaft can be respectively arranged on the two sides of the balance crank, the transmission requirement of a driving system can be met, the bearings can be arranged at the positions closer to the needle rod, the turning radius of the machine head can be reduced, the turning radius of the whole machine head is smaller, and the high-speed rotation of the machine head is facilitated; but also can improve the stress of the bearing, and has the effects of protecting the bearing, reducing noise and prolonging the service life of the bearing.
Preferably, the bearing mounting portion is formed at least on a side surface of the end portion of the rotary block. The bearing can be conveniently mounted and dismounted from the end part of the rotary block, and the assembled bearing can be just positioned at one end of the balance crank, so that the interference on the actions of parts such as a crankshaft, a transmission arm and the like in a driving system is prevented.
Preferably, the bearing mounting portion comprises an annular mounting surface configured to the rotary block. The annular mounting surface is adapted to the inner race of the bearing such that the inner race of the bearing can be mounted to the balance crank by the annular mounting surface.
Further, the bearing installation part further comprises an annular groove matched with the clamp spring. The inner ring of the bearing is limited and restrained by the clamp spring, so that the axial movement of the inner ring of the bearing can be better limited.
In order to solve the installation problem of the crankshaft, a mounting hole matched with the crankshaft is further formed in the end face of the rotary block, and the mounting hole is formed at a position deviated from the rotary center of the rotary block. The crankshaft is eccentrically arranged on the rotary block through the assembling holes, and when the balance crank rotates under the driving of the transmission shaft, the crankshaft can rotate around the rotary center of the transmission shaft, so that the transmission arm can be driven to lift, and the purpose of driving the transmission rod and the needle rod to vertically lift/lower is achieved.
In order to lock the installed crankshaft, further, at least one end of the rotary block is provided with a protrusion protruding outwards, the assembly hole penetrates through the protrusion, a transverse lock hole is formed in the side face of the protrusion, and the transverse lock hole is communicated with the assembly hole. When the crankshaft locking device is assembled, one end of the crankshaft can be inserted into the assembling hole and can be locked through the fastener of the transverse locking hole in a matched mode, so that the purpose of transversely locking the crankshaft is achieved, the crankshaft locking device is convenient to disassemble, and the crankshaft can be effectively prevented from falling off.
For the convenience of machining and forming, preferably, the rotary block and the eccentric block are integrally formed members, or the rotary block is connected to the eccentric block through a connecting piece.
In order to facilitate transmission, in some modes, the transmission shaft is further included, one end of the transmission shaft is connected to the rotary block and/or the eccentric block, the transmission shaft, the rotary block and the eccentric block are integrally formed components, and the rotation center of the transmission shaft is coincident with the rotation center of the rotary block. Namely, the balance crank is provided with the transmission shaft, and the transmission shaft does not need to be assembled.
In other forms, the rotary and/or eccentric mass is configured with a mounting hole adapted to the drive shaft, and the center of the mounting hole coincides with the center of rotation of the rotary mass. During assembly, the balance crank is sleeved on the transmission shaft through the mounting hole, so that the balance crank can be connected with the transmission shaft into a whole to rotate synchronously.
In order to solve the problem of falling off, the eccentric block is further provided with a transverse locking hole, and the transverse locking hole is perpendicular to the mounting hole and is communicated with the mounting hole. By constructing the transverse locking hole, the balance crank is locked by a fastener matched with the transverse locking hole, so that the balance crank and the transmission shaft can be firmly connected into a whole and can synchronously rotate.
Preferably, the mounting holes respectively penetrate through the rotary block and the eccentric block.
For the convenience of machining and forming, the rotary block is preferably of a ring structure.
Preferably, the eccentric block is a fan-shaped block structure.
The utility model provides a sewing machine aircraft nose, includes frame, needle bar and is used for the drive system of the vertical lift of drive needle bar/lift, drive system including install in the frame the motor with balanced crank, motor drive connects balanced crank, balanced crank drive connects the needle bar.
A sewing machine comprises the balance crank or the sewing machine head.
Compared with the prior art, the balance crank, the sewing machine head and the sewing machine provided by the utility model have the advantages that the structure is compact, the design is more reasonable, the structural limitation of the existing balance crank can be solved, the bearings for supporting the transmission shaft can be respectively arranged at the two sides of the balance crank, the transmission requirement of the driving system can be met, the bearings can be arranged at the position closer to the needle rod, the turning radius of the machine head can be reduced, the turning radius of the whole machine head is smaller, and the high-speed rotation of the machine head is facilitated; and the stress of the bearing can be improved, and the effects of protecting the bearing, reducing noise and prolonging the service life of the bearing are achieved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic view of a drive system and a needle bar in a conventional sewing machine head.
Fig. 2 is a front view of a driving system and a needle bar in a sewing machine head according to embodiment 1 of the present invention.
Fig. 3 is a schematic view of a three-dimensional structure of a driving system and a needle bar in a sewing machine head according to embodiment 1 of the present invention.
Fig. 4 is a schematic view of a three-dimensional structure of a sewing machine head provided by the embodiment of the present invention, in which two sides of a balance crank are respectively provided with a bearing.
Fig. 5 is a schematic three-dimensional structure diagram of a balance crank according to embodiment 1 of the present invention.
Fig. 6 is a front view of fig. 5.
Fig. 7 is a second schematic three-dimensional structure diagram of a balance crank according to embodiment 1 of the present invention.
Fig. 8 is a schematic three-dimensional structure diagram of another balance crank provided in embodiment 1 of the present invention.
Description of the drawings
First bearing 301 and second bearing 302
A rotary block 401, an eccentric block 402, an annular mounting surface 403, a mounting hole 404, a transverse locking hole 405, a mounting hole 406, a boss 407 and an annular groove 408.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.
Example 1
Referring to fig. 2 and 3, the present embodiment provides a head of a sewing machine, which includes a frame for supporting, a needle bar 110, and a driving system, wherein the driving system is disposed on the frame and is in transmission connection with the needle bar 110 for driving the needle bar 110 to move up/down along a vertical direction, so as to complete a sewing operation.
In this embodiment, the frame may be an existing frame, and the driving system includes a motor 100, a transmission mechanism 102, a transmission shaft 103 for transmission, a balance crank 104, a crank, a transmission arm 106, a transmission rod 107, and a vertical guide mechanism 108, wherein,
the motor 100 is mounted to the frame for providing power, and the motor 100 may preferably employ a servo motor, a stepping motor, a pneumatic motor 100, or the like.
As shown in fig. 2 and 3, the transmission shaft 103 is generally horizontally disposed in the rack, and the motor 100 is in transmission connection with the transmission shaft 103 through the transmission mechanism 102, so that the transmission shaft 103 is driven to rotate by the motor 100; in this embodiment, the transmission mechanism 102 has multiple embodiments, for example, the transmission mechanism 102 may adopt one or a combination of a gear transmission mechanism 102, a chain transmission mechanism, and a belt transmission mechanism 102, and in this embodiment, the transmission mechanism 102 includes the belt transmission mechanism 102, the belt transmission mechanism 102 includes a driving pulley 201, a driven pulley 202, and a transmission belt 203, wherein, as shown in fig. 2 and 3, the driving pulley 201 may be connected to the output shaft 101 of the motor 100, the driven pulley 202 may be mounted on the transmission shaft 103, and the transmission belt 203 is tensioned on the driving pulley 201 and the driven pulley 202, so that the motor 100 may drive the transmission shaft 103 to rotate through the belt transmission mechanism 102.
As shown in fig. 2 and 3, in the present embodiment, the balance crank 104 is connected to one end of the transmission shaft 103 so as to rotate synchronously with the transmission shaft 103; as shown in fig. 2 and 3, one end of the crank is connected to the balance crank 104 so as to rotate synchronously with the balance crank 104; the upper end of the driving arm 106 is rotatably connected to the crankshaft 105, the lower end of the driving arm 106 is rotatably connected to the driving rod 107, so that the driving arm 106 is driven to ascend/descend by the rotation of the crank, in this embodiment, the upper end of the driving arm 106 may be connected to the crankshaft 105 through a bearing, and the lower end of the driving arm 106 may also be connected to the driving rod 107 through a bearing.
As shown in fig. 2 and 3, one end of the transmission rod 107 is connected to the needle bar 110, the other end of the transmission rod 107 is constrained by the vertical guide mechanism 108, the vertical guide mechanism 108 is vertically disposed on the rack, and the vertical guide mechanism 108 is used for guiding the transmission rod 107 to move in the vertical direction, so that when the balance crank 104 is driven by the transmission shaft 103 to rotate, the crankshaft 105 can rotate around the rotation center of the transmission shaft 103, so as to drive the transmission arm 106 to ascend/descend, and further, the transmission rod 107 and the needle bar 110 can be driven to ascend/descend vertically under the constraining and guiding effects of the vertical guide mechanism 108.
The vertical guide mechanism 108 has various embodiments, for example, the vertical guide mechanism 108 may be a guide slot 109 configured along the vertical direction, as shown in fig. 2 and 3, one end of the transmission rod 107 is fitted into the guide slot 109, and movably constrained in the guide slot 109 for guiding and constraining purposes; for another example, the vertical guide mechanism 108 may include a sliding block and a sliding rail that are adapted to each other, one end of the transmission rod 107 is connected to the sliding block, and the sliding rail is arranged along the vertical direction and fixed to the rack; for another example, the vertical guide mechanism 108 may include a guide rod arranged in a vertical direction, the guide rod is fixed to the rack, one end of the transmission rod 107 is configured with a guide hole adapted to the guide rod, so that one end of the transmission rod 107 can be sleeved on the guide rod through the guide hole, and thus the transmission rod 107 can be raised/lowered in the vertical direction under the constraint of the guide rod; there are other similar embodiments of the vertical guide mechanism 108, which are not illustrated here.
As shown in fig. 2 and fig. 3, in the present embodiment, the transmission shaft 103 may be mounted to the frame through at least two bearings, for example, for convenience of description, in the present embodiment, the transmission shaft 103 may be rotatably connected to the frame through a first bearing 301 and a second bearing 302, and the first bearing 301 and the second bearing 302 are respectively disposed on two sides of the balance crank 104 along the length direction of the transmission shaft 103, as shown in fig. 2 to fig. 4, with such a structural design, not only the transmission shaft 103 may be effectively supported and restrained, but also both bearings may be disposed at positions closer to the needle bar 110, on one hand, the distance between the bearings and the needle bar 110 may be effectively reduced, which is beneficial to reducing the turning radius of the upper handpiece and is more beneficial to the rotation of the upper handpiece; on the other hand, can effectively improve the atress condition of bearing and transmission shaft 103, make the bearing more difficult wearing and tearing in the operation process, can effectively prolong the life of bearing, the fatigue resistance of bearing also can be improved, and the noise of bearing operation in-process can be lower, in addition, because needle bar 110 has frictional force at the in-process of vertical rising/falling, be unfavorable for the speed-up, and after adopting the structure that this embodiment provided, the speed of improvement needle bar 110 that can be easier, thereby be favorable to realizing the high-speed raising and lowering function of needle bar 110.
In order to solve the problem that it is inconvenient to install the first bearing 301 and the second bearing 302 on two sides of the balance crank 104 due to the structural limitation of the balance crank 104 in the prior art, the present embodiment provides a novel balance crank 104, wherein the balance crank 104 comprises a rotary block 401 and an eccentric block 402 connected to the rotary block 401, as shown in fig. 2-7, the center of gravity of the eccentric block 402 is deviated from the center of rotation of the rotary block 401 (i.e., the balance crank 104 rotates under the driving of the transmission shaft 103, and the center of rotation of the rotary block 401), and the eccentric block 402 mainly plays a role in balancing; the rotary block 401 is configured with a bearing mounting part which is matched with the first bearing 301 so as to mount the first bearing 301, and particularly, the bearing mounting part at least needs to be configured at the side surface of the end part of the rotary block 401, as shown in fig. 5, so that the bearing can be conveniently mounted and dismounted from the end part of the rotary block 401, and the assembled bearing can be just positioned at one end of the balance crank 104, and the actions of the crankshaft 105, the transmission arm 106 and other parts in the driving system are prevented from being interfered; in a preferred embodiment, the bearing mounting portion comprises an annular mounting surface 403 configured to the rotary block 401, as shown in fig. 4-7, the annular mounting surface 403 may be adapted to the inner race of the first bearing 301 such that the inner race of the first bearing 301 may be mounted to the balance crank 104 via the annular mounting surface 403, as shown in fig. 4 and 5, in which case the second bearing 302 may be mounted to the drive shaft 103 with the first bearing 301 and the second bearing 302 on either side of the eccentric block 402, as shown in fig. 3 and 4. In a more complete scheme, the bearing mounting portion further includes an annular groove 408 adapted to fit with a snap spring, the annular groove 408 may be configured on the annular mounting surface 403, and may be configured at one end of the annular mounting surface 403, as shown in fig. 5 and 7, so that the snap spring may be assembled in the annular groove 408, so as to limit and constrain the inner ring of the first bearing 301 by using the snap spring, so as to better limit the axial movement of the inner ring of the first bearing 301.
For convenience of processing and forming, in implementation, the rotary block 401 may preferably adopt an annular structure, as shown in fig. 4-6, so that the rotation center of the rotary block 401, the center of the annular mounting surface 403 and the rotation center of the transmission shaft 103 may coincide with each other, which is more favorable for realizing high-speed rotation; accordingly, the eccentric mass 402 may preferably have a fan-shaped block structure, as shown in FIGS. 5 to 7.
In order to facilitate the installation of the second bearing 302 and the driven pulley 202, in this embodiment, the transmission shaft 103 may preferably be a stepped shaft.
In the present embodiment, the balance crank 104 has various embodiments, for example, the rotary block 401 and the eccentric block 402 can be integrally formed, as shown in fig. 5-7; for another example, the rotary block 401 and the eccentric block 402 in the balance crank 104 may also be separately molded, and the molded rotary block 401 and the molded eccentric block 402 may be connected together by a connecting member (e.g., a bolt, etc.) to form the balance crank 104.
In this embodiment, the balance crank 104 may be integrally formed with the transmission shaft 103, as shown in fig. 8, that is, one end of the transmission shaft 103 is connected to the rotary block 401 and/or the eccentric block 402, the transmission shaft 103, the rotary block 401 and the eccentric block 402 are integrally formed members, and the rotation center of the transmission shaft 103 coincides with the rotation center of the rotary block 401, so that the balance crank 104 carries the transmission shaft 103 itself without the need of assembling the transmission shaft 103.
Furthermore, the balance crank 104 can also be detachably mounted to the drive shaft 103, for example, in a preferred embodiment, the turning block 401 and/or the eccentric block 402 are configured with a mounting hole 404 adapted to the drive shaft 103, and the center of the mounting hole 404 coincides with the turning center of the turning block 401; when the balance crank 104 is assembled, the balance crank 104 can be sleeved on the transmission shaft 103 through the mounting hole 404, so that the balance crank 104 and the transmission shaft 103 can be connected into a whole to rotate synchronously.
In a preferred embodiment, the mounting hole 404 may respectively penetrate through the rotary block 401 and the eccentric block 402, as shown in fig. 5-7, which facilitates a more secure connection with the transmission shaft 103; in yet a further embodiment, the balance crank 104 is configured with a transverse locking hole 405, as shown in fig. 5-7, the transverse locking hole 405 is perpendicular to the mounting hole 404 and is communicated with the mounting hole 404, for example, the transverse locking hole 405 may be preferentially configured on the eccentric block 402, so that during the assembly process, the balance crank 104 can be sleeved on the transmission shaft 103 through the mounting hole 404 and can be locked on the transmission shaft 103 through a fastener adapted to the transverse locking hole 405, so that the balance crank 104 and the transmission shaft 103 can be connected into a whole and can rotate synchronously; in practice, the fastening member may be a lock nut or the like, which will not be described in detail later.
In the implementation process, the transverse locking hole 405 may be a threaded hole to fix a fastener, and in addition, a locking hole adapted to the transverse locking hole 405 may also be configured on the transmission shaft 103, the locking hole may be a threaded hole or a smooth hole, and the front end of the fastener may be inserted into the corresponding locking hole through the transverse locking hole 405, so as to achieve the purpose of locking the transmission shaft 103.
In order to improve the stress of the transmission shaft 103, in a preferred embodiment, the transmission mechanism 102 may transmit the transmission shaft 103 connected between the first bearing 301 and the second bearing 302, for example, as shown in fig. 2-4, the driven pulley 202 is mounted on the transmission shaft 103 and located between the balance crank 104 and the second bearing 302.
In a more sophisticated scheme, in order to drive the needle bar 110 to vertically ascend/descend by using the rotation of the balance crank 104, one end of the crankshaft 105 is mounted on the rotary block 401 and is located at a position deviated from the rotation center of the transmission shaft 103, as shown in fig. 2-4, that is, the crankshaft 105 is eccentrically mounted on the rotary block 401, when the balance crank 104 is driven by the transmission shaft 103 to rotate, the crankshaft 105 rotates around the rotation center of the transmission shaft 103, so as to drive the transmission arm 106 to ascend and descend, thereby achieving the purpose of driving the transmission rod 107 and the needle bar 110 to vertically ascend/descend.
To facilitate the installation of the crankshaft 105, in a further embodiment, a mounting hole 406 adapted to the crankshaft 105 is formed in an end surface of the rotation block 401, and the mounting hole 406 is formed at a position offset from the rotation center of the rotation block 401 (i.e., the transmission shaft 103), as shown in fig. 4 and 5, so that one end of the crankshaft 105 can be fixedly mounted to the mounting hole 406.
During assembly, the crankshaft 105 and the assembly hole 406 may be connected by a screw, or the crankshaft 105 may be fixed to the rotary block 401 by a nut; for better locking the assembly hole 406, in a more sophisticated scheme, at least one end of the rotary block 401 is configured with a protrusion 407 protruding outwards, the assembly hole 406 penetrates through the protrusion 407, and the side surface of the protrusion 407 is configured with a transverse locking hole 405, as shown in fig. 4-7, the transverse locking hole 405 is communicated with the assembly hole 406 and can be perpendicular to each other; in the assembling process, one end of the crankshaft 105 can be inserted into the assembling hole 406 and can be locked by a fastener (such as a locking bolt) matched with the transverse locking hole 405, so that the purpose of transversely locking the crankshaft 105 is achieved, the crankshaft 105 is convenient to disassemble, and the crankshaft 105 can be effectively prevented from falling off; in the present embodiment, the purpose of the configuration protrusion 407 is to provide space for configuring the assembly hole 406, so as to facilitate the machining and forming of the assembly hole 406, and also facilitate the installation and removal of the fastener during the subsequent use; in practice, the protrusion 407 may be formed only at one end of the rotary block 401, or may be formed at both ends of the rotary block 401, as shown in fig. 5 to 7, in order to more firmly fix the crankshaft 105.
Example 2
The embodiment provides a sewing machine, including the sewing machine aircraft nose in embodiment 1, still include with the aircraft nose lower aircraft nose of mutually supporting and be used for placing the sewing platform of sewing material, the aircraft nose is installed in sewing platform down, the aircraft nose is installed in sewing platform's support arm to be located sewing platform top adaptation the position department of aircraft nose down for the needle bar 110 of aircraft nose can mutually support with the rotating shuttle mechanism of aircraft nose down, so that smooth completion sewing work.
In practice, the machine head may be fixedly mounted to the support arm or rotatably mounted to the support arm, so that in actual use, the machine head may be driven by the rotating motor 100 to rotate, so as to better fit the lower machine head below.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention.
Claims (10)
1. A balance crank is characterized by comprising a rotary block and an eccentric block connected to the rotary block, wherein the gravity center of the eccentric block deviates from the rotary center of the rotary block, and the rotary block is provided with a bearing mounting part matched with a bearing.
2. The balance crank of claim 1 wherein the bearing mount is configured at least laterally of the end of the rotary block.
3. The balance crank of claim 2, wherein the bearing mounting portion comprises an annular mounting surface configured to the rotary block and to fit a bearing;
and/or, the bearing installation part further comprises an annular groove matched with the clamp spring.
4. The balance crank of claim 1, wherein the end face of the rotary block is formed with a fitting hole for fitting the crankshaft, the fitting hole being formed at a position offset from a rotation center of the rotary block.
5. The balance crank of claim 4, wherein at least one end of the rotary block is configured with a protrusion protruding outward, the fitting hole penetrates the protrusion, and a lateral locking hole is configured at a side of the protrusion, the lateral locking hole communicating with the fitting hole.
6. The balance crank of any one of claims 1 to 5, wherein the rotary block and the eccentric block are integrally formed members, or the rotary block and the eccentric block are integrally connected through a connecting member;
and/or the rotary block is of a ring structure;
and/or the eccentric block is of a fan-shaped block structure.
7. The balance crank of any one of claims 1 to 5, wherein the rotary block and/or the eccentric block is configured with a mounting hole adapted to the transmission shaft, and the center of the mounting hole coincides with the center of rotation of the rotary block;
or the transmission shaft, the rotary block and the eccentric block are integrally formed components, and the rotation center of the transmission shaft is coincided with the rotation center of the rotary block.
8. The balance crank of claim 7, wherein the eccentric mass is configured with a transverse locking hole perpendicular to the mounting hole and communicating with the mounting hole;
and/or the mounting hole respectively penetrates through the rotary block and the eccentric block.
9. A sewing machine head, characterized by comprising a frame, a needle bar and a driving system for driving the needle bar to vertically ascend/descend, wherein the driving system comprises a motor arranged on the frame and a balance crank as claimed in any one of claims 1 to 8, the motor is in transmission connection with the balance crank, and the balance crank is in transmission connection with the needle bar.
10. A sewing machine comprising a balance crank according to any of claims 1 to 8 or comprising a sewing machine head according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220344112.9U CN218321901U (en) | 2022-02-21 | 2022-02-21 | Balance crank, sewing machine head and sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220344112.9U CN218321901U (en) | 2022-02-21 | 2022-02-21 | Balance crank, sewing machine head and sewing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218321901U true CN218321901U (en) | 2023-01-17 |
Family
ID=84830518
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220344112.9U Active CN218321901U (en) | 2022-02-21 | 2022-02-21 | Balance crank, sewing machine head and sewing machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218321901U (en) |
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2022
- 2022-02-21 CN CN202220344112.9U patent/CN218321901U/en active Active
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