U.S. patent application number 14/462895 was filed with the patent office on 2015-12-03 for soft start device for electronic cutting machine tool.
The applicant listed for this patent is DURQ MACHINERY CORP.. Invention is credited to Chien-Chang LIN, Chia-Sheng LIU.
Application Number | 20150349672 14/462895 |
Document ID | / |
Family ID | 54702935 |
Filed Date | 2015-12-03 |
United States Patent
Application |
20150349672 |
Kind Code |
A1 |
LIN; Chien-Chang ; et
al. |
December 3, 2015 |
SOFT START DEVICE FOR ELECTRONIC CUTTING MACHINE TOOL
Abstract
A soft start device for a power cutting machine tool, a control
circuit group includes two end, one of which is connected with an
input power source and the other is connected with each of two
control switches. When the input power source provides a working
voltage for the control circuit group, the control circuit group
outputs a low-level signal to the control switches to enable a
light emitting circuit group to lighting gradually from dark to
light, whereby a resistance of a trigger circuit group decreases
gradually to make motor setup the working voltage. Next, the
control circuit group outputs a high-level signal after a period of
time, to turn on the control switches for inputting voltage to the
motor directly. The soft start device can not only decrease the
noise during activation of the motor but effectively protect the
internal components of an electronic device from damage.
Inventors: |
LIN; Chien-Chang; (Taichung
City, TW) ; LIU; Chia-Sheng; (Taichung City,
TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
DURQ MACHINERY CORP. |
Taichung City |
|
TW |
|
|
Family ID: |
54702935 |
Appl. No.: |
14/462895 |
Filed: |
August 19, 2014 |
Current U.S.
Class: |
318/784 |
Current CPC
Class: |
B23D 59/001 20130101;
H02P 1/04 20130101; B23Q 11/0078 20130101; H02P 1/08 20130101 |
International
Class: |
H02P 1/04 20060101
H02P001/04 |
Foreign Application Data
Date |
Code |
Application Number |
May 30, 2014 |
TW |
103119159 |
Claims
1. A soft start device applied to an electronic cutting machine
tool, the machine tool having a motor, a cutting unit driven by the
motor, and the soft start device connected with the motor, and the
soft start device comprising a control circuit group, a first
control switch, a second control switch, a light emitting circuit
group, and a trigger circuit group; wherein the control circuit
group comprises a regulator circuit and a control circuit, an input
power source being connected to an end of the regulator circuit and
the motor, the other end of the regulator circuit being connected
to the control circuit; when the input power source provides a
working voltage for the control circuit, the control circuit
outputs a low-level signal to the first control switch, a light
emitting unit of the light emitting circuit group generates light
fading up for gradually decreasing a resistance of a sensing unit
of the trigger circuit group to make the working voltage of the
motor increase gradually and make the second control switch
turned-off; after a period of time, the control circuit outputs a
high-level signal to the first control switch to make the second
control switch turned on for inputting the voltage to the motor
directly.
2. The soft start device as defined in claim 1, wherein the control
circuit group further comprises a reversing switch circuit
connected to the control circuit and the first control switch, and
when the low-level signal and the low-level signal pass through the
reversing switch circuit, the reversing switch circuit provides the
high-level signal based on the low-level signal of the control
circuit to turn on the light emitting circuit group or the
reversing switch provides the low-level signal based on the
high-level signal of the control circuit to turn off the light
emitting circuit group.
3. The soft start device as defined in claim 2, wherein the light
emitting circuit group comprises a delay circuit, a Darlington
circuit, and the light emitting unit, the delay circuit being
connected to the Darlington circuit for delaying the lighting of
the light emitting unit for a period of time.
4. The soft start device as defined in claim 2, wherein the control
circuit comprises a control chip, a capacitor, a diode, an
electrolytic capacitor, and a resistor, the input power source
providing a normal working voltage for the control chip and the
electrolytic capacitor, the control chip being connected to the
capacitor, the diode, and the resistor, respectively.
5. The soft start device as defined in claim 2, wherein the trigger
circuit group comprises an RC circuit, a bidirectional trigger
diode, a bidirectional silicon controller, and the sensing unit,
the RC circuit being connected to the bidirectional trigger diode;
when the resistance of the sensing unit decreases gradually, the
voltage of the RC circuit increases gradually to enable the
bidirectional trigger diode to trigger a gate of the bidirectional
silicon controller.
6. The soft start device as defined in claim 2, wherein the first
control switch is a bidirectional silicon controlled switch.
7. The soft start device as defined in claim 2, wherein the second
control switch is a relay.
8. The soft start device as defined in claim 1, wherein the light
emitting circuit group comprises a delay circuit, a Darlington
circuit, and the light emitting unit, the delay circuit being
connected to the Darlington circuit for delaying the lighting of
the light emitting unit for a period of time.
9. The soft start device as defined in claim 1, wherein the control
circuit comprises a control chip, a capacitor, a diode, an
electrolytic capacitor, and a resistor, the input power source
providing a normal working voltage for the control chip and the
electrolytic capacitor, the control chip being connected to the
capacitor, the diode, and the resistor, respectively.
10. The soft start device as defined in claim 1, wherein the
trigger circuit group comprises an RC circuit, a bidirectional
trigger diode, a bidirectional silicon controller, and the sensing
unit, the RC circuit being connected to the bidirectional trigger
diode; when the resistance of the sensing unit decreases gradually,
the voltage of the RC circuit increases gradually to enable the
bidirectional trigger diode to trigger a gate of the bidirectional
silicon controller.
11. The soft start device as defined in claim 1, wherein the first
control switch is a bidirectional silicon controlled switch.
12. The soft start device as defined in claim 1, wherein the second
control switch is a relay.
13. The soft start device as defined in claim 1, wherein the light
emitting unit of the light emitting circuit group is a light
emitting diode.
14. The soft start device as defined in claim 1, wherein the
sensing unit of the trigger circuit group is a photosensitive
resistor.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims the benefit of Taiwan Patent
Application No. 103119159 filed on May 30, 2014, the disclosure of
which is incorporated herein in its entirety by reference.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present disclosure relates to an activation device, in
particular to a soft start device capable of delaying the
activation time of a motor of a power tool.
[0004] 2. Description of the Related Art
[0005] As the industry is developed, many manual operations have
been gradually replaced by electronic tools. In order to prevent
the electronic tool from being impaired by the surge current caused
by the activation of the power source, the activation time of the
electronic tool is usually designed to be delayed when the
electronic tool is activated. If the electronic tool is not
installed with a soft start device capable of delaying the
activation time, a great surge current will enter the electronic
tool as soon as the electronic tool is switched on to make
electronic tool generate enormous noise, so the enormous noise may
easily frighten the operator or spectators. Besides, a connection
interface or internal components of an electronic device are
subject to damage resulting from instant entry of the surge
current. Thus, what is need is to design a soft start device
capable of making the output voltage change gradually.
SUMMARY OF THE INVENTION
[0006] To solve the above-mentioned problems, the primary objective
of the present disclosure is to provide a soft start device for an
electronic cutting machine tool. The soft start device can not only
reduce noise, while the motor is activated, but protect internal
components of an electronic device effectively.
[0007] In order to achieve the above-mentioned objective, the
present disclosure provides a soft start device for an electronic
cutting machine tool. The machine tool comprises a motor, a cutting
unit driven by the motor, and a soft start device connected with
the motor. The soft start device comprises a control circuit group,
a first control switch, a second control switch, a light emitting
circuit group, and a trigger circuit group. The control circuit
group comprises a regulator circuit and a control circuit. An input
power source is connected to one end of the regulator circuit and
the motor, and the other end of the regulator circuit is connected
with the control circuit. When the input power source provides a
working voltage for the control circuit, the control circuit
outputs a low-level signal to the first control switch and a light
emitting unit of the light emitting circuit group generates light
fading up to make the resistance of a sensing unit of the trigger
circuit group decrease gradually and to make the working voltage of
the motor increase gradually. After a period of time, the control
circuit outputs a high-level signal to the first control switch to
turn on the second control switch for inputting the voltage to the
motor directly.
[0008] Preferably, the control circuit group further comprises a
reversing switch circuit connected with the control circuit and the
first control switch. While the low-level signal and the high-level
signal are transmitted through the reversing switch circuit, the
reversing switch circuit provides a high-level signal based on the
low-level signal of the control circuit for turning on the light
emitting circuit group, or the reversing switch provides a
low-level signal based on the high-level signal of the control
circuit for turning off the light emitting circuit group.
[0009] Preferably, the light emitting circuit group comprises a
delay circuit, a Darlington circuit, and the light emitting unit.
The delay circuit is connected to the Darlington circuit for
delaying the lighting of the light emitting unit for a period of
time.
[0010] Preferably, the control circuit comprises a control chip, a
capacitor, a diode, an electrolytic capacitor, and a resistor. The
input power source provides a normal working voltage for the
control chip and the electrolytic capacitor. The control chip is
connected to the capacitor, the diode, and the resistor.
[0011] Preferably, the trigger circuit group comprises an RC
circuit, a bidirectional trigger diode, a bidirectional silicon
controller, and the sensing unit. The RC circuit is connected to
the bidirectional trigger diode. When the resistance of the sensing
unit decreases gradually, the voltage of the RC circuit increases
gradually to enable the bidirectional trigger diode to reach
breakdown for conduction, so that a gate of the bidirectional
silicon controller is triggered to make rotation of the motor high
speed from low speed.
[0012] Preferably, the first control switch is a bidirectional
silicon controlled switch.
[0013] Preferably, the second control switch is a relay.
[0014] Therefore, the soft start device of the present disclosure
provides a light signal indicative of fading up for the sensing
unit of the trigger circuit group via the light emitting unit of
the light emitting circuit group to make the resistance of the
sensing unit decrease gradually and to make rotation of the motor
reach high speed from low speed, so that the noise generated during
the activation of the motor can be decreased and the internal
components of the electronic device are protected efficiently from
being damaged.
[0015] In order to further understand the techniques, means and
effects of the present disclosure, the following detailed
descriptions and appended drawings are hereby referred, such that,
through which, the purposes, features and aspects of the present
disclosure can be thoroughly and concretely appreciated; however,
the appended drawings are merely provided for reference and
illustration, without any intention to be used for limiting the
present disclosure.
BRIEF DESCRIPTION OF THE DRAWINGS
[0016] FIG. 1 illustrates an electronic cutting machine tool to
which the soft start device applied.
[0017] FIG. 2 illustrates an electronic cutting machine tool to
which the soft start device applied.
[0018] FIG. 3 is a rough circuit diagram of the soft start device
for the electronic cutting machine tool of the present
disclosure.
[0019] FIG. 4 is a detailed circuit diagram of the soft start
device applied to the electronic cutting machine tool of the
present disclosure in accordance with a first preferred
embodiment.
[0020] FIG. 5 is a block diagram of the soft start device applied
to the electronic cutting machine tool of the present disclosure in
accordance with the first preferred embodiment.
[0021] FIG. 6 is a detailed circuit diagram of the soft start
device applied to the electronic cutting machine tool of the
present disclosure in accordance with a second preferred
embodiment.
[0022] FIG. 7 is a block diagram of the soft start device applied
to the electronic cutting machine tool of the present disclosure in
accordance with the second preferred embodiment.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0023] Reference will now be made in detail to the preferred
embodiments of the present disclosure, examples of which are
illustrated in the accompanying drawings. Wherever possible, the
same reference numbers are used in the drawings and the description
to refer to the same or like parts.
[0024] Referring to FIGS. 1-4, a first preferred embodiment of the
present disclosure provides a soft start device 10 for an
electronic cutting machine tool 1. The machine tool 1 has a motor
20, a cutting unit 21 driven by the motor 20, and the soft start
device 10 connected with the motor 20. The machine tool 1 described
in this preferred embodiment can be but not limited to a table
sawing machine or a circular sawing machine, and the cutting unit
21 can be but not limited to a circular saw piece. The soft start
device 10 of the present in disclosure mainly comprises a control
circuit group 30, a first control switch 40, a second control
switch 50, a light emitting circuit group 60, and a trigger circuit
group 70. The control circuit group 30 comprises a regulator
circuit 31, a control circuit 32, and a reversing switch circuit
33. The control circuit 32 comprises a control chip 321, a
capacitor 322, a diode 323, an electrolytic capacitor 324, and a
resistor 325. The control chip 321 is connected to the capacitor
322, the electrolytic capacitor 324, the diode 323, and the
resistor 325. An input power source provides a working voltage for
the regulator circuit 31 and the motor 20. The regulator circuit 31
is connected to the control chip 321 and the capacitor 322. The
reversing switch circuit 33 is connected to the control chip 321 of
the control circuit 30 and connected to the first control switch 40
via a diode 41, for providing a reverse signal for the light
emitting circuit group 60. The light emitting circuit group 60
comprises a delay circuit 61, a Darlington circuit 62, and a light
emitting unit 63. The delay circuit 61 is connected to the
Darlington circuit 62 for delaying the lighting of the light
emitting unit 63 for a period of time. The trigger circuit group 70
comprises an RC circuit 71, a bidirectional trigger diode 72, a
bidirectional silicon controller 73, and a sensing unit 74. The RC
circuit 71 is connected to the bidirectional trigger diode 72. When
the resistance of the sensing unit 74 decreases gradually, the
voltage of the RC circuit 71 increases gradually to enable the
bidirectional trigger diode 72 to trigger the bidirectional silicon
controller 73, and the turned-on angle of the bidirectional silicon
controller 73 becomes larger and larger, so the working voltage of
the motor 20 increases gradually and the rotating speed of the
motor 20 become higher correspondingly.
[0025] Please refer to FIG. 5. After the power source switch is
turned on, when the input power source provides the working voltage
for the control circuit 32 the control circuit 32 outputs a
low-level signal L1 to the reversing switch circuit 33 and then the
low-level signal L1 passes through to reach the first control
switch 40 via the diode 41. Because the low-level signal L1 is
insufficient to make the first control switch 40 turn on the second
control switch 50, the second control switch 50 and the motor 20
are turned-off. The reversing switch circuit 33 provides a
high-level signal H2 for a delay circuit 61 of the delay circuit
group 60 according to the low-level signal L1 of the control
circuit 30, so the light emitting unit 63 of the light emitting
circuit group 60 generates light fading up to gradually lower the
resistance of the sensing unit 74 of the trigger circuit group 70
and to steadily heighten the working voltage of the motor 20
increases steadily. In the meantime, the rotating speed of the
motor 20 increases gradually to become higher and higher as the
working voltage increases gradually. Next, the control circuit 32
outputs a high-level signal H1 to the reversing switch circuit 33
and the first control switch 40 after a period of time, the second
control switch 50 is switched to be turned on with the motor 20
directly by the first control switch 40. The high-level signal H1
of the control circuit group 30 is converted into a low-level
signal L2 through the reversing switch circuit 33, and the
low-level signal L2 is provided for the light emitting circuit
group 60, so the light emitting circuit group 60 and the trigger
circuit group 70 stop operation. In addition, the trigger circuit
group 70 also stops operation due to the increased resistance of
the sensing unit 74, and meanwhile, the voltage is directly
inputted to the motor 20 via the second control switch 50, and the
motor 20 does not stop operation until a power switch is turned
off. In this preferred embodiment of the present disclosure, the
first control switch 40 is a bidirectional silicon controlled
switch, the second control switch 50 is a relay, the light emitting
unit 63 is a light emitting diode, and the sensing unit 74 is a
photosensitive resistor.
[0026] Please refer to FIGS. 6-7. A second preferred embodiment of
the present disclosure provides a soft start device 10' for the
electronic cutting machine tool 1. The soft start device 10' mainly
comprises the control circuit group 30, the first control switch
40, the second control switch 50, the light emitting circuit group
60 and the trigger circuit group 70. The circuits of the second
preferred embodiment are similar to those of the first preferred
embodiment, having the following difference. The control circuit
group 30 of the second preferred embodiment only comprises the
regulator circuit 31 and the control circuit 32 other than the
reversing switch circuit 33 of the first preferred embodiment, so
the descriptions of the same parts are omitted and only the
difference is recited in following paragraph.
[0027] The input power source is connected to one end of the
regulator circuit 31 and the motor 20. The other end of the
regulator circuit 31 is connected to the control circuit 32. After
the power switch is turned on, the input power source provides the
working voltage for the control circuit 32 and the control circuit
32 outputs the low-level signal L1 to the first control switch 40
for linking-up with the second control switch 50. However, the
low-level signal L1 is insufficient to make the second control
switch 50 switched on, so the second control switch 50 and the
motor 20 become turned-off. The light emitting unit 63 of the light
emitting circuit group 60 generates light fading up as the power
switch is turned on, so that the resistance of the sensing unit 74
of the trigger circuit group 70 decreases gradually and the working
voltage of the motor 20 starts to increase gradually and steadily.
In the meantime, the rotating speed of the motor 20 becomes higher
as the working voltage increases and after a period of time, the
control circuit 32 outputs the high-level signal H1 to the first
control switch 40 to enable the first control switch 40 to make the
second control switch 50 switched on with the motor 20 directly, so
the voltage can be inputted to the motor 20 directly via the second
control switch 50 and meanwhile, the motor 20 can keep operation.
It is worth mentioning that the difference between the trigger
circuit groups 70 of the first preferred embodiment and the second
preferred embodiment lies in that the trigger circuit group 70 of
the second preferred embodiment is not turned on or turned off by
the low-level signal L1 or the high-level signal H1 outputted from
the control circuit 32. However, the trigger circuit group 70 of
the second preferred embodiment can be turned on or turned off
directly by the power switch.
[0028] In conclusion, the soft start devices 10 and 10'of the
present disclosure provide the light fading up for the sensing unit
74 of the trigger circuit group 70 through the light emitting unit
63 of the light emitting circuit group 60, so the resistance of the
sensing unit 74 decreases gradually to make the motor 20 have
steady working voltage. In this way, the noise generated during the
activation of the motor can be decreased and the internal
components of the electronic device can be protected
effectively.
[0029] The above-mentioned descriptions represent merely the
preferred embodiments of the present disclosure, without any
intention to limit the scope of the present disclosure thereto.
Various equivalent changes, alternations or modifications based on
the claims of present disclosure are all consequently viewed as
being embraced by the scope of the present disclosure.
* * * * *