CN109402888A - A kind of sewing machine switching device and sewing machine - Google Patents
A kind of sewing machine switching device and sewing machine Download PDFInfo
- Publication number
- CN109402888A CN109402888A CN201811425626.1A CN201811425626A CN109402888A CN 109402888 A CN109402888 A CN 109402888A CN 201811425626 A CN201811425626 A CN 201811425626A CN 109402888 A CN109402888 A CN 109402888A
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- CN
- China
- Prior art keywords
- touch
- needle
- sewing machine
- press
- key
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/96—Touch switches
- H03K17/9645—Resistive touch switches
- H03K17/9647—Resistive touch switches using a plurality of detectors, e.g. keyboard
Abstract
The invention discloses a kind of sewing machine switching device and sewing machines, comprising: for generating the benefit needle touch key-press for mending needle touch signal when itself is touched；For generated when itself is touched backstitch touch signal backstitch touch key-press；Respectively with mend needle touch key-press and backstitch the touch recognition circuit that touch key-press connect, for receive mend needle touch signal after determination benefit needle touch key-press be pressed, and trigger the manual benefit needle function of sewing machine；Receive backstitch touch signal after determine and backstitch touch key-press and be pressed, and that triggers sewing machine backstitches function manually.As it can be seen that the benefit needle key of the application and backstitching key and being all made of touch-key.The problem of mechanical aging is not present in touch-key, and reliability is higher, and the service life is longer；Moreover, the problem of mechanical shaking is not present in touch-key, signal is more stable.
Description
Technical field
The present invention relates to sewing machine fields, more particularly to a kind of sewing machine switching device and sewing machine.
Background technique
Currently, sewing machine includes simple held sewing machine and function held sewing machine.Simple held sewing machine only mends needle function manually
Can, and function held sewing machine not only has benefit needle function manually, there are also backstitch function manually.For simple held sewing machine, pass through
Needle function is mended in the benefit needle button triggering of mechanical spring-piece type manually；For function held sewing machine, equally pass through mechanical spring-piece type
It mends needle button or backstitches button and accordingly trigger benefit needle function manually or backstitch function manually.But too due to button frequency of use
Height is easy to cause the elastic slice in button to fail, to cause the case where can not bouncing after pressing；Moreover, button is pressed
When can there are problems that mechanical shaking, the identified difficulty of the signal for causing button to be pressed is higher.
Therefore, how to provide a kind of scheme of solution above-mentioned technical problem is that those skilled in the art needs to solve at present
The problem of.
Summary of the invention
It, the problem of mechanical aging is not present, can the object of the present invention is to provide a kind of sewing machine switching device and sewing machine
Higher by property, the service life is longer；And the problem of mechanical shaking is not present, signal is more stable.
In order to solve the above technical problems, the present invention provides a kind of sewing machine switching devices, comprising:
For generating the benefit needle touch key-press for mending needle touch signal when itself is touched；
For generated when itself is touched backstitch touch signal backstitch touch key-press；
Respectively with the benefit needle touch key-press and the touch recognition circuit for backstitching touch key-press and connecting, for receiving
It determines that the benefit needle touch key-press is pressed after to the benefit needle touch signal, and triggers the manual benefit needle function of sewing machine；?
Receive it is described backstitch determine after touch signal described in backstitch touch key-press and be pressed, and trigger backstitching manually for the sewing machine
Function.
Preferably, the benefit needle touch key-press is specially first resistor formula metal contact piece；It is described that backstitch touch key-press specific
For second resistance formula metal contact piece；Wherein, the first resistor formula metal contact piece and the second resistance formula metal contact piece exist
Resistance value declines when being touched；
Then the touch recognition circuit includes:
The benefit needle touch recognition circuit being connect with the first resistor formula metal contact piece, for detecting first electricity
It is generated after the resistance value decline of resistive metal contact piece and mends needle push button signalling；
Touch recognition circuit is backstitched with what the second resistance formula metal contact piece was connect, for detecting second electricity
It is generated after the resistance value decline of resistive metal contact piece and backstitches push button signalling；
It is connect respectively with the output end for mending needle touch recognition circuit and the output end for backstitching touch recognition circuit
Main control unit；For determining that the benefit needle touch key-press is pressed after receiving the benefit needle push button signalling, and trigger institute
State the manual benefit needle function of sewing machine；Receive it is described backstitch determine after push button signalling described in backstitch touch key-press and be pressed,
And it triggers the manual of the sewing machine and backstitches function.
Preferably, the first resistor formula metal contact piece and the second resistance formula metal contact piece are specially bimetallic touching
Piece.
Preferably, the benefit needle touch recognition circuit and it is described backstitch touch recognition circuit and include the first DC power supply,
First build-out resistor, the second build-out resistor, third build-out resistor, comparator, pull-up resistor, the first current-limiting resistance, the second current limliting
Resistance, the second DC power supply and switching tube；Wherein:
The first end of first build-out resistor is connect with the output end of first DC power supply, the first matching electricity
The second end of resistance one of contact with the anode of the comparator and the bimetallic contact of affiliated touch recognition circuit respectively
Connection, another contact is connect with the first end of the ground terminal of the comparator and second current-limiting resistance respectively, public
End ground connection, the cathode of the comparator respectively with the first end of second build-out resistor and the third build-out resistor first
End connection, second build-out resistor second end ground connection, the second end of the third build-out resistor respectively with the comparator
Power end, the first end of the pull-up resistor and the first end connection of the switching tube, common end and second direct current
The output end of power supply connects, and the output end of the comparator is electric with the second end of the pull-up resistor and first current limliting respectively
The first end of resistance connects, and the second end of first current-limiting resistance is connect with the control terminal of the switching tube, the switching tube
Second end is connect with the second end of second current-limiting resistance, output end of the common end as affiliated touch recognition circuit；Its
In, the switching tube ends in control terminal input high level, low level when be connected；
The comparator be used for when the bimetallic contact of affiliated touch recognition circuit is not touched export high level signal,
Low level signal is exported when being touched；
Then the main control unit is specifically used for after receiving the high level signal for mending needle touch recognition circuit output
It determines that the benefit needle touch key-press is pressed, and triggers the manual benefit needle function of sewing machine；Knowledge is touched receiving described backstitch
Touch key-press is backstitched described in determining after the high level signal of other circuit output to be pressed, and is triggered the manual of sewing machine and backstitched function
Energy.
Preferably, the comparator for mending needle touch recognition circuit and the comparator for backstitching touch recognition circuit are integrated
Together.
Preferably, the switching tube is specially PNP type triode, and the base stage of the PNP type triode is as the switch
The control terminal of pipe, first end of the emitter of the PNP type triode as the switching tube, the collection of the PNP type triode
Second end of the electrode as the switching tube.
Preferably, the main control unit is specially Digital Signal Processing DSP control unit.
Preferably, first DC power supply and second DC power supply are specially rechargeable battery.
Preferably, first DC power supply and second DC power supply are same power supply.
In order to solve the above technical problems, the present invention also provides a kind of sewing machine, including any of the above-described kind of sewing machine switch
Device.
The present invention provides a kind of sewing machine switching devices, comprising: believes for generating to mend needle and touch when itself is touched
Number benefit needle touch key-press；For generated when itself is touched backstitch touch signal backstitch touch key-press；Respectively with mend needle
Touch key-press and the touch recognition circuit for backstitching touch key-press and connecting, for receive mend needle touch signal after determine and mend needle touching
It touches key to be pressed, and triggers the manual benefit needle function of sewing machine；Receive backstitch touch signal after determine backstitch touch by
Key is pressed, and triggers the manual of sewing machine and backstitch function.
As it can be seen that the benefit needle key of the application and backstitching key and being all made of touch-key.There is no machinery for touch-key
The problem of aging, reliability is higher, and the service life is longer；Moreover, the problem of mechanical shaking is not present in touch-key, signal is more
Add stabilization.
The present invention also provides a kind of sewing machines, with above-mentioned sewing machine switching device beneficial effect having the same.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to institute in the prior art and embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of structural schematic diagram of sewing machine switching device provided in an embodiment of the present invention；
Fig. 2 is a kind of structural schematic diagram for mending needle/backstitch touch recognition circuit provided in an embodiment of the present invention.
Specific embodiment
It the problem of core of the invention is to provide a kind of sewing machine switching device and sewing machine, and mechanical aging is not present, can
Higher by property, the service life is longer；And the problem of mechanical shaking is not present, signal is more stable.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Fig. 1 is please referred to, Fig. 1 is a kind of structural schematic diagram of sewing machine switching device provided in an embodiment of the present invention.
The sewing machine switching device includes:
For generating the benefit needle touch key-press 1 for mending needle touch signal when itself is touched；
For generated when itself is touched backstitch touch signal backstitch touch key-press 2；
Respectively with mend needle touch key-press 1 and backstitch the touch recognition circuit 3 that touch key-press 2 connect, for receiving benefit
It determines that mending needle touch key-press 1 is pressed after needle touch signal, and triggers the manual benefit needle function of sewing machine；Touching is backstitched receiving
It determines that backstitching touch key-press 2 is pressed after touching signal, and triggers the manual of sewing machine and backstitch function.
Specifically, the sewing machine switching device of the application be set to function held sewing machine (have the function of to mend manually needle with it is manual
Backstitch function) on.This sewing machine switching device includes mending needle touch key-press 1, backstitching touch key-press 2 and touch recognition circuit 3, work
Make principle are as follows:
When mending finger touch of the needle touch key-press 1 by user, benefit needle touch signal can be generated by mending needle touch key-press 1, and
Needle touch signal will be mended and be sent to touch recognition circuit 3.Then true after receiving benefit needle touch signal by touch recognition circuit 3
Surely it mends needle touch key-press 1 to be pressed, and triggers the manual benefit needle function of sewing machine.
When backstitching touch key-press 2 and being touched by the finger of user, backstitches touch key-press 2 and can generate and backstitch touch signal, and
Touch signal will be backstitched and be sent to touch recognition circuit 3.Then by touch recognition circuit 3 receive backstitch touch signal after really
Surely it backstitches touch key-press 2 to be pressed, and triggers the manual of sewing machine and backstitch function.
As it can be seen that the benefit needle touch key-press 1 of the application and to backstitch touch key-press 2 be touch-key.Touch-key is not
There are problems that mechanical aging, reliability is higher, and the service life is longer；Moreover, touch-key asking there is no mechanical shaking
Topic, signal are more stable.
Similarly, for simple held sewing machine (only having the function of to mend needle manually), sewing machine switching device includes:
For generating the benefit needle touch key-press for mending needle touch signal when itself is touched；
The benefit needle touch recognition circuit connecting with benefit needle touch key-press is mended for determining after receiving benefit needle touch signal
Needle touch key-press is pressed, and triggers the manual benefit needle function of sewing machine.
The present invention provides a kind of sewing machine switching devices, comprising: believes for generating to mend needle and touch when itself is touched
Number benefit needle touch key-press；For generated when itself is touched backstitch touch signal backstitch touch key-press；Respectively with mend needle
Touch key-press and the touch recognition circuit for backstitching touch key-press and connecting, for receive mend needle touch signal after determine and mend needle touching
It touches key to be pressed, and triggers the manual benefit needle function of sewing machine；Receive backstitch touch signal after determine backstitch touch by
Key is pressed, and triggers the manual of sewing machine and backstitch function.
As it can be seen that the benefit needle key of the application and backstitching key and being all made of touch-key.There is no machinery for touch-key
The problem of aging, reliability is higher, and the service life is longer；Moreover, the problem of mechanical shaking is not present in touch-key, signal is more
Add stabilization.
On the basis of the above embodiments:
As a kind of preferred embodiment, mending needle touch key-press 1 is specially first resistor formula metal contact piece；Backstitch touch by
Key 2 is specially second resistance formula metal contact piece；Wherein, first resistor formula metal contact piece and second resistance formula metal contact piece are in quilt
Resistance value declines when touch；
Then touch recognition circuit 3 includes:
The benefit needle touch recognition circuit being connect with first resistor formula metal contact piece, for detecting first resistor formula metal
It is generated after the resistance value decline of contact and mends needle push button signalling；
Touch recognition circuit is backstitched with what second resistance formula metal contact piece was connect, for detecting second resistance formula metal
It is generated after the resistance value decline of contact and backstitches push button signalling；
Respectively with the output end for mending needle touch recognition circuit and backstitch the master control list that the output end of touch recognition circuit connect
Member；For determining that mending needle touch key-press 1 is pressed after receiving benefit needle push button signalling, and trigger the manual benefit needle function of sewing machine
Energy；Receive backstitch push button signalling after determine and backstitch touch key-press 2 and be pressed, and that triggers sewing machine backstitches function manually.
Specifically, the benefit needle touch key-press 1 of the application can select metal contact piece, this metal contact piece is the identification of resistance-type
Mode (referred to as first resistor formula metal contact piece): this metal contact piece is affixed on sensor surface, when being contacted with finger, resistance value
Become smaller.Similarly, the application backstitch touch key-press 2 can also select be affixed on sensor surface metal contact piece (referred to as second electricity
Resistive metal contact piece).
Based on this, the touch recognition circuit 3 of the application includes mending needle touch recognition circuit, backstitching touch recognition circuit and master
Unit is controlled, its working principle is that: needle touch recognition circuit is mended after the resistance value decline for detecting first resistor formula metal contact piece,
Think that mending needle touch key-press 1 is pressed, then generating indicates to mend the benefit needle push button signalling that needle touch key-press 1 is pressed, and will mend needle
Push button signalling is sent to main control unit.Main control unit determines that mending needle touch key-press 1 is pressed after receiving benefit needle push button signalling,
And trigger the manual benefit needle function of sewing machine.Similarly, it backstitches touch recognition circuit and is detecting second resistance formula metal contact piece
After resistance value decline, it is believed that backstitch touch key-press 2 and be pressed, then generating indicates to backstitch that touch key-press 2 is pressed backstitches key
Signal, and push button signalling will be backstitched and be sent to main control unit.Main control unit receive backstitch push button signalling after determination backstitch touching
It touches key 2 to be pressed, and triggers the manual of sewing machine and backstitch function.
As a kind of preferred embodiment, first resistor formula metal contact piece and second resistance formula metal contact piece are specially double
Metal contact piece.
Further, the first resistor formula metal contact piece of the application and second resistance formula metal contact piece are all made of bimetallic touching
Piece is mended needle touch key-press 1 or is backstitched in touch key-press 2 containing there are two metal contact pieces.
Referring to figure 2., Fig. 2 is a kind of structural representation for mending needle/backstitch touch recognition circuit provided in an embodiment of the present invention
Figure.
As a kind of preferred embodiment, mending needle touch recognition circuit and backstitching touch recognition circuit includes the first direct current
Power supply, the first build-out resistor R1, the second build-out resistor R2, third build-out resistor R3, comparator U, pull-up resistor R, the first current limliting
Resistance R11, the second current-limiting resistance R12, the second DC power supply and switching tube Q；Wherein:
The first end of first build-out resistor R1 is connect with the output end of the first DC power supply, and the second of the first build-out resistor R1
End is connect with one of contact of the anode of comparator U and the bimetallic contact of affiliated touch recognition circuit respectively, another
Contact is connect with the first end of the ground terminal of comparator U and the second current-limiting resistance R12 respectively, common end grounding, comparator U's
Cathode is connect with the first end of the first end of the second build-out resistor R2 and third build-out resistor R3 respectively, the second build-out resistor R2's
Second end ground connection, the second end of third build-out resistor R3 respectively with the power end of comparator U, pull-up resistor R first end and open
Close the first end connection of pipe Q, common end connect with the output end of the second DC power supply, the output end of comparator U respectively with it is upper
The second end of pull-up resistor R is connected with the first end of the first current-limiting resistance R11, the second end and switching tube Q of the first current-limiting resistance R11
Control terminal connection, the second end of switching tube Q connect with the second end of the second current-limiting resistance R12, and common end is as affiliated touching
Touch the output end of identification circuit；Wherein, switching tube Q end in control terminal input high level, low level when be connected；
Comparator U is used to export high level signal, quilt when the bimetallic contact of affiliated touch recognition circuit is not touched
Low level signal is exported when touch；
Then main control unit, which is specifically used for determining after receiving the high level signal for mending needle touch recognition circuit output, mends needle
Touch key-press 1 is pressed, and triggers the manual benefit needle function of sewing machine；Receiving the height electricity for backstitching touch recognition circuit output
It determines that backstitching touch key-press 2 is pressed after ordinary mail number, and triggers the manual of sewing machine and backstitch function.
Specifically, the benefit needle touch recognition circuit of the application is identical with the recognition principle for backstitching touch recognition circuit, so
Identical circuit structure can be used in the two, comprising: the first DC power supply, the first build-out resistor R1, the second build-out resistor R2, third
It build-out resistor R3, comparator U, pull-up resistor R, the first current-limiting resistance R11, the second current-limiting resistance R12, the second DC power supply and opens
Close pipe Q.Below for mending needle touch key-press 1 (resistance-type bimetallic contact), illustrate recognition principle:
The voltage of the input anode of comparator U isWherein, Rk1It indicates to mend needle touch key-press 1
Resistance value (its Standard resistance range is determined by production technology), R1Indicate the resistance value of the first build-out resistor R1, Vcc indicates the first direct current
The output voltage in source.The voltage of the input negative terminal of comparator U isWherein, R2Indicate the second build-out resistor
The resistance value of R2, R3Indicate the resistance value of third build-out resistor R3, Vcc indicates the output voltage of the second DC power supply (with the first direct current
The output voltage of power supply is identical).
When selecting the resistance value of each build-out resistor, on the one hand, should ensure that idle state (i.e. benefit needle touch key-press 1 not by
Touch) under U+ > U-.Then output end output high level signal of comparator U is opened due to the effect of pull-up resistor R in the case of this
It closes pipe Q and be in off state when low level (switching tube Q ends in control terminal input high level, be connected), benefit needle touch recognition
The output end vo of circuit exports low level signal to main control unit.So main control unit receive mend needle touch recognition circuit it is defeated
Determine that mending needle touch key-press 1 is not pressed after low level signal out.
On the other hand, it should ensure that the U+ < U- when mending needle touch key-press 1 and being touched, i.e., when benefit needle touch key-press 1 is touched,
Rk1Become smaller, U+ < U-.Then output end of comparator U exports low level signal in the case of this, so switching tube Q is on shape
State, the output end vo for mending needle touch recognition circuit export high level signal to main control unit.So main control unit is receiving benefit
It determines that mending needle touch key-press 1 is pressed after the high level signal of needle touch recognition circuit output, and triggers the manual benefit of sewing machine
Needle function.
For backstitching the recognition principle of touch key-press 2, identical as needle touch key-press 1 is mended, details are not described herein by the application.
It mends needle it should be noted that main control unit is set in advance and backstitches I/O mouthfuls one-to-one, the corresponding I/ of benefit needle
O mouthfuls receive the level signal for mending the output end output of needle touch recognition circuit, backstitch corresponding I/O mouthfuls of reception and backstitch touch recognition
The level signal of the output end output of circuit.Main control unit accordingly identifies touch key-press according to two I/O mouthfuls of received level signal
Whether it is pressed.
In addition, if Rk1Standard resistance range 15 ± 2M Ω, each device parameters can be as shown in table 1 in circuit:
Table 1
| Vcc | R1 | R2 | R3 | R11 | R12 | R |
| 5V | 10MΩ | 10KΩ | 10KΩ | 1KΩ | 1KΩ | 10KΩ |
As for the design parameter of device each in circuit, the application is not particularly limited herein, according to the actual situation depending on.
As a kind of preferred embodiment, mends the comparator of needle touch recognition circuit and backstitch the comparison of touch recognition circuit
Device integrates.
Further, the comparator for mending needle touch recognition circuit can be integrated in one with the comparator for backstitching touch recognition circuit
One twin-channel comparator of composition is played, so that a twin-channel comparator can meet the needs of two touch key-press simultaneously.
It is twin-channel comparator for example, selecting the comparator of SLCS147 model.
As a kind of preferred embodiment, switching tube Q is specially PNP type triode, and the base stage of PNP type triode, which is used as, to be opened
Close the control terminal of pipe Q, first end of the emitter of PNP type triode as switching tube Q, the collector conduct of PNP type triode
The second end of switching tube Q.
Specifically, the switching tube Q of the application can be selected but is not limited only to PNP type triode (signal driving capability be put
Greatly), as long as meeting high level cut-off, low level conducting, the application is not particularly limited herein.
As a kind of preferred embodiment, main control unit is specially Digital Signal Processing DSP control unit.
Specifically, main control unit can select DSP (Digital Signal Processing, Digital Signal Processing) to control
Unit processed, DSP control unit need signal from analog domain being transformed into numeric field before carrying out signal processing.
As a kind of preferred embodiment, the first DC power supply and the second DC power supply are specially rechargeable battery.
Specifically, the first DC power supply and the second DC power supply of the application can select rechargeable battery, such as metatitanic acid
Lithium battery, better performances, cost is relatively low.
As a kind of preferred embodiment, the first DC power supply and the second DC power supply are same power supply.
Further, same power supply, save the cost can be selected in the first DC power supply and the second DC power supply.
The present invention also provides a kind of sewing machines, including any of the above-described kind of sewing machine switching device.
The introduction of sewing machine provided by the invention please refers to the embodiment of above-mentioned sewing machine switching device, and the application is herein not
It repeats again.
It should also be noted that, in the present specification, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (10)
1. a kind of sewing machine switching device characterized by comprising
For generating the benefit needle touch key-press for mending needle touch signal when itself is touched；
For generated when itself is touched backstitch touch signal backstitch touch key-press；
Respectively with the benefit needle touch key-press and the touch recognition circuit for backstitching touch key-press and connecting, for receiving
It states and determines that the benefit needle touch key-press is pressed after mending needle touch signal, and trigger the manual benefit needle function of sewing machine；It is receiving
To it is described backstitch determine after touch signal described in backstitch touch key-press and be pressed, and that triggers the sewing machine backstitches function manually
Energy.
2. sewing machine switching device as described in claim 1, which is characterized in that the benefit needle touch key-press is specially the first electricity
Resistive metal contact piece；The touch key-press that backstitches is specially second resistance formula metal contact piece；Wherein, the first resistor formula metal
Resistance value declines when touched for contact and the second resistance formula metal contact piece；
Then the touch recognition circuit includes:
The benefit needle touch recognition circuit being connect with the first resistor formula metal contact piece, for detecting the first resistor formula
It is generated after the resistance value decline of metal contact piece and mends needle push button signalling；
Touch recognition circuit is backstitched with what the second resistance formula metal contact piece was connect, for detecting the second resistance formula
It is generated after the resistance value decline of metal contact piece and backstitches push button signalling；
The master being connect respectively with the output end for mending needle touch recognition circuit and the output end for backstitching touch recognition circuit
Control unit；For determining that the benefit needle touch key-press is pressed after receiving the benefit needle push button signalling, and trigger the seam
It threads the manual benefit needle function of machine；Receive it is described backstitch determine after push button signalling described in backstitch touch key-press and be pressed, and touch
That sends out sewing machine described backstitches function manually.
3. sewing machine switching device as claimed in claim 2, which is characterized in that the first resistor formula metal contact piece and described
Second resistance formula metal contact piece is specially bimetallic contact.
4. sewing machine switching device as claimed in claim 3, which is characterized in that the benefit needle touch recognition circuit and it is described fall
Seam touch recognition circuit includes the first DC power supply, the first build-out resistor, the second build-out resistor, third build-out resistor, compares
Device, pull-up resistor, the first current-limiting resistance, the second current-limiting resistance, the second DC power supply and switching tube；Wherein:
The first end of first build-out resistor is connect with the output end of first DC power supply, first build-out resistor
Second end is connect with one of contact of the anode of the comparator and the bimetallic contact of affiliated touch recognition circuit respectively,
Another contact is connect with the first end of the ground terminal of the comparator and second current-limiting resistance respectively, public termination
Ground, the cathode of the comparator connect with the first end of the first end of second build-out resistor and the third build-out resistor respectively
It connects, the second end of second build-out resistor ground connection, the second end of the third build-out resistor electricity with the comparator respectively
The first end of source, the first end of the pull-up resistor and the switching tube connects, common end and second DC power supply
Output end connection, the output end of the comparator respectively with the second end of the pull-up resistor and first current-limiting resistance
First end connection, the second end of first current-limiting resistance are connect with the control terminal of the switching tube, and the second of the switching tube
End is connect with the second end of second current-limiting resistance, output end of the common end as affiliated touch recognition circuit；Wherein, institute
State switching tube end in control terminal input high level, low level when conducting；
The comparator is used to export high level signal when the bimetallic contact of affiliated touch recognition circuit is not touched, be touched
Low level signal is exported when touching；
Then the main control unit is specifically used for determining after receiving the high level signal for mending needle touch recognition circuit output
The benefit needle touch key-press is pressed, and triggers the manual benefit needle function of sewing machine；Described touch recognition electricity is backstitched receiving
Touch key-press is backstitched described in determining after the high level signal of road output to be pressed, and is triggered the manual of sewing machine and backstitched function.
5. sewing machine switching device as claimed in claim 4, which is characterized in that the comparator for mending needle touch recognition circuit
It is integrated with the comparator for backstitching touch recognition circuit.
6. sewing machine switching device as claimed in claim 4, which is characterized in that the switching tube is specially PNP type triode,
Control terminal of the base stage of the PNP type triode as the switching tube, the emitter of the PNP type triode be used as described in open
Close the first end of pipe, second end of the collector of the PNP type triode as the switching tube.
7. sewing machine switching device as claimed in claim 4, which is characterized in that the main control unit is specially at digital signal
Manage DSP control unit.
8. sewing machine switching device as claimed in claim 4, which is characterized in that first DC power supply and described second is directly
Galvanic electricity source is specially rechargeable battery.
9. sewing machine switching device as claimed in claim 8, which is characterized in that first DC power supply and described second is directly
Galvanic electricity source is same power supply.
10. a kind of sewing machine, which is characterized in that including the described in any item sewing machine switching devices of such as claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811425626.1A CN109402888A (en) | 2018-11-27 | 2018-11-27 | A kind of sewing machine switching device and sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811425626.1A CN109402888A (en) | 2018-11-27 | 2018-11-27 | A kind of sewing machine switching device and sewing machine |
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| Publication Number | Publication Date |
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| CN109402888A true CN109402888A (en) | 2019-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811425626.1A Pending CN109402888A (en) | 2018-11-27 | 2018-11-27 | A kind of sewing machine switching device and sewing machine |
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| Country | Link |
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| CN (1) | CN109402888A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4053789A (en) * | 1976-08-27 | 1977-10-11 | Honeywell Inc. | Touch actuated system responsive to a combination of resistance and capacitance |
| JPS58221518A (en) * | 1982-06-18 | 1983-12-23 | Columbia Onkyo Kogyo Kk | Touch switch circuit |
| CN2775938Y (en) * | 2005-04-20 | 2006-04-26 | 谢勇 | Inductive switch |
| CN206181460U (en) * | 2016-11-24 | 2017-05-17 | 苏州工业职业技术学院 | Intelligent desk lamp based on single -chip microcomputer |
| CN206640562U (en) * | 2017-03-09 | 2017-11-14 | 东华理工大学 | A kind of practical touch sounding device circuit |
-
2018
- 2018-11-27 CN CN201811425626.1A patent/CN109402888A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4053789A (en) * | 1976-08-27 | 1977-10-11 | Honeywell Inc. | Touch actuated system responsive to a combination of resistance and capacitance |
| JPS58221518A (en) * | 1982-06-18 | 1983-12-23 | Columbia Onkyo Kogyo Kk | Touch switch circuit |
| CN2775938Y (en) * | 2005-04-20 | 2006-04-26 | 谢勇 | Inductive switch |
| CN206181460U (en) * | 2016-11-24 | 2017-05-17 | 苏州工业职业技术学院 | Intelligent desk lamp based on single -chip microcomputer |
| CN206640562U (en) * | 2017-03-09 | 2017-11-14 | 东华理工大学 | A kind of practical touch sounding device circuit |
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Application publication date: 20190301 |