# US 2014/0197762 A1 · Motor-driving device of an electric caulking gun > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0197762 A1 - Document ID: US20140197762A1 - Status: Published application - Kind: A1 - Application number: 13/741,696 - Filed: 2013-01-15 - Published: 2014-07-17 - Earliest claimed: 2013-01-15 - Assignees: Techway Industrial Co., Ltd. - Applicants: Techway Industrial Co., Ltd. - Inventors: Chih-Hua HSU; Sen-Hsien FANG; Tain-Meei LEE; Hong-Yao CHEN - Web page: https://patentgrep.com/patent/US20140197762A1 ## CPC - H02P 7/03: for controlling the direction of rotation of DC motors - H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS ## Abstract A motor-driving device of an electric caulking gun has a micro-controller unit (MCU), a direction-changing module, a motor and a speed sensor. The direction-changing module and the speed sensor are electrically connected to the MCU. The direction-changing module is electrically connected to the motor, and the speed sensor detects a speed of the motor. The MCU is built in with a speed determination procedure comparing an actual speed of the motor acquired from the speed sensor with a preset speed. If the actual speed is lower than the preset speed, it indicates that the resistance at a tube nozzle of the electrical caulking gun increases and the direction-changing module increases the speed of the motor to maintain a preset caulk discharge rate. Given the motor-driving device, the operational inconvenience arising from the unstable caulk discharge rate of conventional electric caulking gun can be tackled. ## Claims ### Claim 1 A motor-driving device of an electric caulking gun comprising: a micro-controller unit (MCU) built in with a speed determination procedure comparing a speed of a motor with a preset speed and outputting a speed signal; a direction-changing module electrically connected to the MCU and the motor, and receiving the speed signal to control the speed of the motor; a power supply module electrically connected to the MCU and the direction-changing module to supply an operating power to the MCU and the direction-changing module; a power switch unit connected in series between the power supply module and the MCU to switch power on or off and set up the speed of the motor; and a speed sensor electrically connected to the MCU and the motor, detecting the speed of the motor and outputting the speed of the motor to the MCU. ### Claim 2 (depends on 1) The motor-driving device as claimed in claim 1, further comprising a circuit breaker and a rectification module connected in series between the power switch unit and the MCU, wherein the circuit breaker has a transistor connected in series between a positive electrode of the power supply module and the rectification module and connected to the MCU through another transistor, and the rectification module has a voltage regulation IC. ### Claim 3 (depends on 2) The motor-driving device as claimed in claim 2, further comprising a forward and rewind signal amplification module connected in series between the MCU and the direction-changing module, receiving forward and rewind speed signals from the MCU and outputting the forward and rewind speed signals to the direction-changing module after inverting amplification. ### Claim 4 (depends on 3) The motor-driving device as claimed in claim 3, wherein the direction-changing module has: two power pins connected to the power supply module; and four control pins connected to the forward and rewind signal amplification module. ### Claim 5 (depends on 4) The motor-driving device as claimed in claim 4, wherein the direction-changing module has two current-sensing pins detecting a current of the motor and outputting a signal to the MCU when the direction-changing module detects an over-current condition or an abnormal temperature rise of the motor. ### Claim 6 (depends on 1) The motor-driving device as claimed in claim 1, wherein the power supply module has: four pins; a battery set connected between two of the four pins; and a temperature sensor connected between other two of the four pins, and mounted in the proximity of the battery set to detect operating temperature of the battery set. ### Claim 7 (depends on 2) The motor-driving device as claimed in claim 2, wherein the power supply module has: four pins; a battery set connected between two of the four pins; and a temperature sensor connected between other two of the four pins, and mounted in the proximity of the battery set to detect operating temperature of the battery set. ### Claim 8 (depends on 3) The motor-driving device as claimed in claim 3, wherein the power supply module has: four pins; a battery set connected between two of the four pins; and a temperature sensor connected between other two of the four pins, and mounted in the proximity of the battery set to detect operating temperature of the battery set. ### Claim 9 (depends on 4) The motor-driving device as claimed in claim 4, wherein the power supply module has: four pins; a battery set connected between two of the four pins; and a temperature sensor connected between other two of the four pins, and mounted in the proximity of the battery set to detect operating temperature of the battery set. ### Claim 10 (depends on 5) The motor-driving device as claimed in claim 5, wherein the power supply module has: four pins; a battery set connected between two of the four pins; and a temperature sensor connected between other two of the four pins, and mounted in the proximity of the battery set to detect operating temperature of the battery set. ### Claim 11 (depends on 1) The motor-driving device as claimed in claim 1, wherein the power switch unit has: a variable speed switch connected to the power supply module; a speed adjustment knob connected to the power switch unit; and a forward and rewind switch connected to the forward and rewind signal amplification module. ### Claim 12 (depends on 2) The motor-driving device as claimed in claim 2, wherein the power switch unit has: a variable speed switch connected to the power supply module; a speed adjustment knob connected to the power switch unit; and a forward and rewind switch connected to the forward and rewind signal amplification module. ### Claim 13 (depends on 3) The motor-driving device as claimed in claim 3, wherein the power switch unit has: a variable speed switch connected to the power supply module; a speed adjustment knob connected to the power switch unit; and a forward and rewind switch connected to the forward and rewind signal amplification module. ### Claim 14 (depends on 4) The motor-driving device as claimed in claim 4, wherein the power switch unit has: a variable speed switch connected to the power supply module; a speed adjustment knob connected to the power switch unit; and a forward and rewind switch connected to the forward and rewind signal amplification module. ### Claim 15 (depends on 5) The motor-driving device as claimed in claim 5, wherein the power switch unit has: a variable speed switch connected to the power supply module; a speed adjustment knob connected to the power switch unit; and a forward and rewind switch connected to the forward and rewind signal amplification module. ### Claim 16 (depends on 6) The motor-driving device as claimed in claim 6, wherein the power switch unit has: a variable speed switch connected to the power supply module; a speed adjustment knob connected to the power switch unit; and a forward and rewind switch connected to the forward and rewind signal amplification module. ### Claim 17 (depends on 7) The motor-driving device as claimed in claim 7, wherein the power switch unit has: a variable speed switch connected to the power supply module; a speed adjustment knob connected to the power switch unit; and a forward and rewind switch connected to the forward and rewind signal amplification module. ### Claim 18 (depends on 8) The motor-driving device as claimed in claim 8, wherein the power switch unit has: a variable speed switch connected to the power supply module; a speed adjustment knob connected to the power switch unit; and a forward and rewind switch connected to the forward and rewind signal amplification module. ### Claim 19 (depends on 9) The motor-driving device as claimed in claim 9, wherein the power switch unit has: a variable speed switch connected to the power supply module; a speed adjustment knob connected to the power switch unit; and a forward and rewind switch connected to the forward and rewind signal amplification module. ### Claim 20 (depends on 10) The motor-driving device as claimed in claim 10, wherein the power switch unit has: a variable speed switch connected to the power supply module; a speed adjustment knob connected to the power switch unit; and a forward and rewind switch connected to the forward and rewind signal amplification module.