Summary of the invention
In view of this, electromagnet or manual elevation's pressure can be reduced the object of the present invention is to provide a kind of presser foot lifting device
Active force when foot.It is a further object of the present invention to provide a kind of sewing machines including above-mentioned presser foot lifting device.
To achieve the goals above, the invention provides the following technical scheme:
A kind of presser foot lifting device, comprising:
It is articulated with the lift lever of the casing of sewing machine, the pressure of sewing machine can be controlled when the lift lever rotates forward
Foot is lifted upwards；
The elastic component that first end is connect with the lift lever, second end can be connect with the casing；The elastic component
In nonequilibrium condition, so that lift lever edge rotates forward.
Preferably, the lift lever is equipped with strip-shaped hole, and slidable switching pin, the elasticity are equipped in the strip-shaped hole
Part and the switching pin connection.
Preferably, the strip-shaped hole is waist-shaped hole；Or the lift lever is in the form of sheets.
Preferably, the elastic component is spring.
Preferably, the both ends of the spring are distributed with upper hook body and lower hook body, the upper hook body by spring hanging pin with
The casing connection, the lower hook body are sheathed on the periphery of the switching pin.
It preferably, further include the switching hanging plate being articulated on the casing, the switching hanging plate is equipped with spacing breach, and works as
When the switching hanging plate is rotated to the direction close to the switching pin, the spacing breach can be pasted with the side wall of the switching pin
It closes, the position to limit the elastic component first end.
Preferably, the lift lever is equipped with cambered way, and the switching hanging plate is equipped with mounting hole, consolidates in the mounting hole
Surely it is connected with the guide pin that can be moved along the cambered way；When the lift lever rotates backward, the switching hanging plate energy
Enough directions to close to the switching pin rotate, until the spacing breach abuts limit with switching pin.
A kind of sewing machine, including any one of the above presser foot lifting device.
Presser foot lifting device provided by the invention includes lift lever and elastic component；Wherein, the machine of lift lever and sewing machine
Shell is hinged, and can control on presser feet and lift when rotating forward；The both ends of elastic component are connect with lift lever and casing respectively, and
Elastic component can control lift lever and rotate forward.
In use, elastic component is in nonequilibrium condition, and elastic component is pulled or supported using the elastic-restoring force of itself
Pushing and lifting lever makes it have the torque rotated along forward direction around articulated shaft.Sewing can be controlled since lift lever rotates forward
The presser feet of machine is lifted, therefore the lifting of the restoring force auxiliary presser foot of elastic component indirect utilization itself.In the certain feelings of foot pressure
Under condition, reduces active force needed for user is lifted presser feet manually, reduce the labor intensity of user；Also reduce the drive of electromagnet
Presser foot lifting device provided by the present application provides positive torque for lift lever using the restoring force of elastic component, realizes
Reduce the effect of working strength.Present invention also provides a kind of sewing machines with above-mentioned presser foot lifting device, have with above-mentioned
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Core of the invention is to provide a kind of presser foot lifting device, can reduce the working strength of worker's presser foot lifter, reduces electricity
The driving force of magnet presser foot lifter.It is a further object of the present invention to provide a kind of sewing machines including above-mentioned presser foot lifting device.
Fig. 1~4 is please referred to, Fig. 1 is the structural schematic diagram under presser foot lifting device assembled state provided by the present invention；Fig. 2
For the structural schematic diagram of presser foot lifting device provided by the present invention；Fig. 3 is presser foot lifting device first provided by the present invention work
Working principle diagram under state；Fig. 4 is the working principle diagram under the second working condition of presser foot lifting device provided by the present invention.
The present invention provides a kind of presser foot lifting devices, including lift lever 6 and elastic component 2, wherein lift lever 6 is hinged
In on the casing of sewing machine, and when lift lever 6 rotates forward, can control the presser feet of sewing machine and be lifted upwards；Elastic component 2
First end connect with lift lever 6, second end can be connect with casing.And elastic component 2 is in nonequilibrium condition, can make to mention
Lever 6 is risen along rotating forward.
Specifically, sewing machine generally includes the components such as presser foot lifter pull rod, cam, presser feet with reference to Fig. 1；Wherein, presser foot lifter is drawn
The end of bar is connect with lift lever 6, and cam is set to the lower section of lift lever 6, passes through the first articulated shaft 7 in the middle part of lift lever 6
It is carried out with the casing of sewing machine hinged.When pulling presser foot lifter lever or control cam rotation, lift lever 6 is hinged with first
It is rotated centered on axis 7, and presser feet is driven to rise.It describes hereinafter for convenience, the rotation of lift lever 6 when presser feet being claimed to rise
Direction is forward direction.
Elastic component 2 can be specifically using spring or stretch cord or rubber column or other flexible elements, both ends point
It is not connect with the casing of lift lever 6 and sewing machine.Elastic component 2 may be at drawing high state, also may be at compressive state,
Particular state can be determined according to the positional relationship between positive specific direction and elastic component 2 and the first articulated shaft 7.
For example, elastic component 2 is located at the first articulated shaft when presser foot lifting device is in visual angle shown in Fig. 3 and is clockwise positive
7 left side then needs to provide auxiliary force F upward for lift lever 6, just can reach labour-saving effect.
Presser foot lifting device provided by the present application is provided with the elastic component 2 for storing power function, utilizes the restoring force of elastic component 2
The rotation of auxiliary pushing lift lever 6, to reduce the working strength of user in the case where ensureing that foot pressure is constant；And it is right
The problem of in electronic presser foot lifting device, also can reduce the workload of electromagnet, alleviating electromagnet fever, abnormal sound.And due to
The height of presser foot lifter is generally only 1~2cm, therefore the variable quantity of 2 length of elastic component is smaller, and elastic component 2 is applied to lift lever 6
Active force variation it is smaller, when presser foot lifter the active force of manual rotating spanner can be relatively uniform.
Optionally, in a kind of embodiment provided by the present application, lift lever 6 is equipped with strip-shaped hole, and being equipped in strip-shaped hole can slide
Dynamic switching pin 4, elastic component 2 are connect with switching pin 4.Specifically, promoting thick stick to save the occupied space of material and component
Bar 6 preferably uses laminated structure；Strip-shaped hole on lift lever 6 can be in long waist type, arc or other shapes；4 sets of pin of switching
Be connected to strip-shaped hole inside, its being capable of the smooth sliding in strip-shaped hole.In actual use, the end cross-sectional of switching pin 4
Can suitably it increase, so that the axial position to itself limits.
Optionally, in a kind of embodiment of fixed elastic component 2 provided by the present application, specifically using spring as elastic component 2,
The both ends of spring are distributed with upper hook body and lower hook body, and upper hook body is connect by spring hanging pin 1 with casing, and lower hook body, which is sheathed on, to be turned
The periphery of outbound 4.
Specifically, spring hanging pin 1 is fixedly connected by bolt with the casing of sewing machine, while being offered in spring hanging pin 1
The upper hook body of cavernous structure, spring is placed in cavernous structure, and the lower hook body of spring is hooked on the periphery of switching pin 4, is realized
The fixation of spring.In addition, also needing to control elongation/decrement of spring according to demand during installation, so that spring generates properly
Driving moment.It should be understood that elastic component 2 can also be by being bonded or bolting or other modes are fixed.
Further, it is contemplated that when normal sewing operation, rising without controlling presser feet, the restoring force of elastic component 2 can be right
The pressure of presser feet interferes, and influences being normally carried out for sewing operation.Therefore, in order to optimize the using effect of presser foot lifting device,
On the basis of any one above-mentioned embodiment, presser foot lifting device further includes the switching hanging plate 3 being articulated on casing, hanging plate of transferring
3 are equipped with spacing breach, and when hanging plate 3 of transferring is rotated to the direction close to switching pin 4, spacing breach can be with switching pin 4
Side wall fitting, the position to limit 2 first end of elastic component.
Specifically, switching hanging plate 3 is hinged with casing by the second articulated shaft 9, edge is extended with concave structure to middle part,
The fringe region of switching hanging plate 3 is set to form spacing breach.Switching hanging plate 3 is mainly used for switching the effect of the restoring force of elastic component 2
Object, when presser foot lifter, the restoring force of elastic component 2 is acted on lift lever 6；And when being not necessarily to presser foot lifter, control switching hanging plate
3 around the second articulated shaft 9 rotate and make spacing breach close to switching pin 4, switching 3 rotation process of hanging plate in spacing breach can will
Switching pin 4 is enclosed in therein.When elastic component 2 is contacted and is detached from lift lever 6 with switching hanging plate 3, elastic component 2 is returned
Multiple power acts on switching hanging plate 3；Switching hanging plate 3 is using the restoring force of the second articulated shaft 9 balance elastic component 2 and to bullet at this time
The position of property 2 first end of part is limited.
It is provided with switching hanging plate 3 in the present embodiment, lift lever 6 can substituted without switching hanging plate 3 when being lifted presser feet
The restoring force for bearing elastic component 2, avoids the rotation of lift lever 6, to ensure the pressure of presser feet, make sewing operation smoothly into
Row.And when needing to be lifted presser feet, then can control the rotation of lift lever 6, hanging plate 3 of transferring at this time is first detached from switching pin 4, and
Elastic component 2 drives lift lever 6 to rotate forward afterwards, realizes the effect to lighten one's labor.
Optionally, in order to optimize the using effect of presser foot lifting device, on the basis of the above embodiments, lift lever 6 is set
There is a cambered way 8, switching hanging plate 3 is equipped with mounting hole, and being fixedly connected in mounting hole can the arcuately mobile guide pin 5 of slideway 8；
When lift lever 6 rotates backward, switching hanging plate 3 can be rotated to the direction close to switching pin 4, until spacing breach and switching
Pin 4 abuts limit.
Specifically, cambered way 8 can be the trough body structure on 6 surface of lift lever, or the through-hole structure of bar shaped.
Mounting hole is offered on switching hanging plate 3, mounting hole is fixed with guide pin 5 by way of interference fit.
In order to facilitate understanding, have a talk about by taking Fig. 3 and Fig. 4 as an example bright, lift lever 6 is suitable in Fig. 3 and visual angle shown in Fig. 4
Hour hands rotation is to rotate forward.When lift lever 6 rotates forward, the arcuately slideway centered on the second articulated shaft 9 of guide pin 5
8 rotations, and switching hanging plate 3 is driven to be detached from switching pin 4, contact elastic component 2 with lift lever 6, it realizes and is promoted using elastic component 2
The effect rotated forward into lift lever 6；And when lift lever 6 rotates backward, then guide pin 5 and the cooperation of cambered way 8 are slided
It is dynamic, it is detached from switching with pin lift lever 6 and contacts limit with switching hanging plate 3, to ensure the pressure of presser feet.
It should be noted that two dotted line camber lines with arrow respectively indicate lift lever 6 during presser foot lifter in Fig. 3
With the rotation direction of switching hanging plate 3；Lift lever 6 when two dotted line camber lines with arrow respectively indicate normal sewing in Fig. 4
With the rotation direction of switching hanging plate 3.It should be understood that the position of the rotation direction and the two of lift lever 6 and hanging plate 3 of transferring is closed
It is related, the two situation opposite there may be rotation direction.
Switching hanging plate 3 and switching pin 4 are automatically controlled using the mechanical structure of guide pin 5 and cambered way 8 in the present embodiment
Connection status, improve the degree of automation of presser foot lifting device, be more convenient user use.
In addition to above-mentioned presser foot lifting device, the present invention also provides a kind of sewing including any one of the above presser foot lifting device
Machine, the sewing machine can reduce the amount of labour of user during being lifted presser feet, be convenient for the user to use；Also it can reduce electricity
The driving force of magnet.Refer to the prior art for the structure of other each sections of the sewing machine, and repeats no more herein.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
Sewing machine provided by the present invention and its presser foot lifting device are described in detail above.Tool used herein
Principle and implementation of the present invention are described for body example, the above embodiments are only used to help understand this hair
Bright method and its core concept.It should be pointed out that for those skilled in the art, not departing from the present invention
, can be with several improvements and modifications are made to the present invention under the premise of principle, these improvement and modification also fall into right of the present invention
It is required that protection scope in.