A high-speed nailing control method for a nail gun

Abstract

The present application relates to a kind of high-speed driving control method of nail gun, belong to tool technical field.The control circuit of nail gun using this method contains the intelligent device of signal input end respectively connecting trigger switch, touch switch, mode switch button and the position sensor at driving wheel;The controlled end of motor is connected to the control output end of intelligent device, and each step is controlled according to continuous fire judgment, firing judgment, driving lifting, position judgment, continuous position, touch judgment, brake stop rotation.The control logic of the present application can "mask" the interference of muzzle impact vibration when driving by continuous position, ingeniously solve the misjudgment stop problem caused by touch judgment first, then position, ensure high-speed driving operation.

Description

Technical Field

[0001] This invention relates to a control method for a nail gun, and more particularly to a high-speed nail-driving control method for a nail gun, belonging to the field of tool technology. Background Technology

[0002] Fasteners such as nail guns use compressed air to power a piston in a cylinder, which in turn drives a firing pin to drive nails into the workpiece. They are commonly used tools in industries such as construction and decoration. Due to safety concerns and other issues associated with gas-powered nail guns, they have been gradually replaced by electric pneumatic nail guns in recent years. US Patent No. 8011441 discloses a typical structure of an electric pneumatic nail gun, which includes an energy storage mechanism consisting of a cylinder and a piston within the housing. A retractable nozzle is mounted at the front of the nail holder, and a nail magazine is located on one side. A handle with a battery pack is located on one side of the cylinder, and a nail magazine is located on the other side of the nozzle. The nail magazine contains a nail pusher that pushes the nails towards the nail holder. Between the handle and the nail magazine is an electric lifting mechanism that drives the piston to compress and store energy. The lifting mechanism includes a drive wheel that meshes with the firing pin, and the drive wheel is connected to a motor powered by the battery pack. When the nozzle is pressed down, the motor will be started, and the lifting mechanism will drive the firing pin from the temporarily locked ready position to drive the piston to compress air. After the firing pin is disengaged from the lifting mechanism, it will be suddenly released to strike the row of nails in the nail magazine that has been pushed into the nail holder by the nail pusher, causing it to be ejected from the nozzle.

[0003] To achieve rapid nailing, existing electric pneumatic nail gun control systems include not only a trigger switch typically located on the handle, an impact switch on the nail holder, and a drive wheel position sensor in the drive unit, but also a mode switching button. They offer not only a single-shot firing mode (firing once by pressing down the nozzle and the trigger) but also a continuous-fire mode: as long as the nozzle is pressed down and the trigger is held down, the nail gun fires continuously and automatically, thus increasing nailing speed. However, the continuous-fire control logic, as can be seen from US Patent No. 8387718, is still based on single-shot control. After each nail shot, the motor brakes and then checks if the impact switch has been released; if not, the motor restarts to continue nailing. Because the motor needs to brake after each nail shot during continuous-fire operation, it inevitably affects further improvements in nailing efficiency and shortens the motor's lifespan. In other words, because the motor that drives the compressed air has to pause after each nailing stroke and restart when the next nailing stroke begins, the nail gun cannot respond to the operator's actions in a timely manner even in high-speed nailing operations, and there will be occasional instances of not being able to fire continuously. This is because during rapid nailing operations, the gun will be triggered again before a nailing stroke is completed. Since the previous nailing cycle has not ended, the triggering is considered invalid. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a high-speed nailing control method for nail guns that can further and effectively improve the continuous nailing speed.

[0005] To achieve the above objectives, the basic technical solution of the high-speed nailing control method for a nail gun of the present invention is as follows: the nail gun includes a housing with a handle and...

[0006] The energy storage mechanism consists of a cylinder and a piston located inside the housing;

[0007] The striking mechanism consists of a telescopic nozzle attached to the nail-driving seat at the front of the housing.

[0008] The nail-driving mechanism consists of a firing pin that is connected to the piston and extends to the nozzle;

[0009] The lifting mechanism consists of a motor-driven wheel that meshes with the firing pin;

[0010] The control circuit contains intelligent devices whose signal input terminals are respectively connected to a trigger switch, a touch switch, a mode switching button, and a rotation sensor at the drive wheel;

[0011] The control output terminal of the intelligent device is connected to the controlled terminal of the motor, and control is performed according to the following steps:

[0012] Step 1: Continuous Fire Detection – After powering on, determine if it is in continuous fire mode based on the signal from the mode switch button; otherwise, enter single-fire control mode.

[0013] Step 2, Firing Detection – Determine whether firing has occurred based on the trigger switch signal. If yes, proceed to the next step; otherwise, return to the previous step.

[0014] Step 3, Drive Lifting - Start the motor to rotate, and the lifting mechanism drives the piston through the firing pin to compress air and store energy to fire the nail;

[0015] Step 4, Rotation Detection – From the moment the motor starts rotating until the drive wheel rotates to a predetermined initial rotation angle greater than 15° and less than 360°, determine whether a rotation sensor signal is detected. If so, proceed to the next step immediately; otherwise, proceed to Step 7.

[0016] Step 5, Continuous Rotation – From the moment the rotation sensor signal is detected, the control motor continues to drive the drive wheel to rotate by a first predetermined angle or for a first predetermined time, and proceeds to the next step;

[0017] Step 6, Touch Detection – Determine whether a touch switch signal is received during the process of the drive wheel rotating from the first predetermined angle to the second predetermined angle or from the first predetermined time to the second predetermined time. If not, proceed to the next step; if yes, return to step 3.

[0018] Step 7: Braking and stopping the rotation – Control the motor to brake and stop rotating.

[0019] Existing electric nail guns, even in continuous firing mode, continue with the traditional single-shot control logic. After each nailing action, the motor is paused to prevent accidental triggering, and the next nailing action is restarted after a reassessment. Therefore, even with short pauses during continuous firing, the deceleration and acceleration during restarting take 100-200ms longer than continuous, uniform rotation. Furthermore, tests show that the cycle time for a single nailing action in existing electric nail guns is around 500ms. If the time interval between two consecutive trigger presses is shorter than the cycle time—meaning the trigger is pressed again before the previous cycle is complete—the existing electric nail gun cannot initiate the next nailing action. This results in a feeling of unease for the operator, requiring repeated trigger presses and leading to a poor user experience. However, with the control method of this invention, in continuous firing mode, once fired, the motor receives the impact signal while continuously running, achieving continuous nailing. Since there is no time spent pausing and restarting the motor, the efficiency of continuous nailing can be further improved, and the stability and reliability of the motor and transmission mechanism can be guaranteed. By utilizing the rotation judgment control logic during this control process, faults such as Hall sensor malfunctions can be detected in a timely manner, ensuring safety. Furthermore, existing control logic, which performs a touch-based judgment during the nail-driving stage, is prone to misinterpreting the impact vibration of the nozzle as a release of the nozzle, causing the motor to stop. In contrast, the control logic of this invention, which performs continuous rotation before touch-based judgment, cleverly solves the problem of misjudgment and shutdown caused by the previous method, effectively "shielding" the impact vibration of the nozzle during nail driving by continuously rotating the nozzle, thus ensuring high-speed nail driving operations. Attached Figure Description

[0020] Figure 1 A schematic diagram of an embodiment of the method of the present invention.

[0021] Figure 2 for Figure 1 A cross-sectional structural diagram of the embodiment.

[0022] Figure 3 for Figure 1 A three-dimensional structural diagram of the embodiment after the outer shell has been removed.

[0023] Figure 4 for Figure 1 A three-dimensional structural diagram of the lifting mechanism in the embodiment.

[0024] Figure 5 for Figure 1 A schematic diagram of the structure where the phase angle of the drive wheel is 0° in the embodiment.

[0025] Figure 6 for Figure 1A schematic diagram of the structure with a drive wheel phase angle of 100° in the embodiment.

[0026] Figure 7 for Figure 1 A schematic diagram of the structure with a drive wheel phase angle of 250° in the embodiment.

[0027] Figure 8 for Figure 1 Corresponding to the Implementation Examples Figure 7 A schematic diagram of the transmission structure of the lifting mechanism.

[0028] Figure 9 for Figure 1 A schematic diagram of the control circuit in the embodiment.

[0029] Figure 10 for Figure 1 The control process logic block diagram of the embodiment. Detailed Implementation

[0030] In this embodiment, the nail gun used to implement the high-speed nail-driving control method is as follows: Figure 1 , Figure 2 and Figure 3 As shown, the device includes a housing 1 with a handle 1-1; a cylinder 3 and a piston 2 located inside the housing 1 constitute an energy storage mechanism; a nail-driving seat 4 at the front end of the housing 1 and a telescopic nozzle 5 constitute an impact mechanism; a firing pin 6 connected to the piston 2 and extending to the nozzle 5 constitutes a nail-driving mechanism; and a motor 9 that meshes with one side of the firing pin 6 drives a wheel 7 to form a lifting mechanism (see [reference]). Figure 4 (See Chinese patent document with application number 202122833775.5 for details); It also contains... Figure 10 The control circuit shown has similar basic components and working principles to existing technologies, and will not be described in detail here.

[0031] Control circuit such as Figure 9 As shown, the controller C, located above the battery 10, contains a smart device. Its signal input terminals are connected to the trigger switch A at the grip 1-1, the touch switch B at the nail holder 4, the single-shot / burst-fire mode switch E located above and behind the battery 10, and a Hall effect displacement sensor D fixed to the drive wheel bracket at the drive wheel 7. The magnet d of this sensor is mounted on the drive wheel 7. The control output terminal of the smart device is connected to the controlled terminal of the motor 10, and as shown... Figure 10 As shown, control is performed according to the following steps:

[0032] Step 1: Continuous Fire Judgment - After powering on, determine whether to fire continuously based on the signal from the mode switch button E. If so, proceed to the next step; otherwise, operate in the normal single-fire mode. Each time the trigger is pressed and the device is engaged, one nail-driving action is completed, the motor is paused, and the next nail-driving action will begin after the next engagement.

[0033] Step 2, Firing Detection – Determine whether to fire based on the signal from trigger switch A. If yes, proceed to the next step; otherwise, return to the previous step.

[0034] The third step is to drive the lifting mechanism. The motor 10 is started to rotate, and the lifting mechanism drives the piston 2 through the firing pin 6 to compress air and store energy before firing the nail.

[0035] Step 4, Rotation Judgment – ​​From the moment the motor starts rotating until the drive wheel 7 rotates 15° to 360°, ideally one full rotation, determine whether a rotation sensor signal is detected. If so, proceed to the next step immediately; otherwise, a fault such as magnet detachment or Hall sensor malfunction may occur, and proceed to Step 7.

[0036] Step 5, Continuous rotation – Control the motor from Figure 5 The signal from the detection of the rotation sensor, i.e., from the point where the Hall effect rotation sensor D and the magnet d coincide at an angular angle, continues to drive the drive wheel 7 to rotate a first predetermined angle of 100° (or it can continue to drive the drive wheel to rotate for a first predetermined time corresponding to the first predetermined angle) until... Figure 6 Proceed to the next step at the indicated location.

[0037] Step 6, Touch Detection – Determine if drive wheel 7 is affected. Figure 6 The first predetermined turning angle shown is 100°. Figure 7 During the second predetermined 250° rotation, does the system receive a trigger switch signal indicating that the nozzle 5 is pressed down? If not, the nail-driving operation will cease, and the next step will proceed. If yes, the system returns to the third step, enabling continuous rotation of the motor for nail-driving. The second predetermined 250° position is exactly as shown... Figure 8 As shown, the first side tooth 6-1 of the firing pin 6 meshes with the first drive roller 7-1 of the drive wheel 7.

[0038] Step 7: Braking and stopping the rotation – Control the motor to brake and stop rotating to ensure that the firing pin stops at the predetermined position to avoid accidental continuous nailing and ensure the safe completion of this nailing operation.

[0039] Experiments show that when the electric nail gun using the control method of this embodiment fires nails continuously, pressing the nozzle to maintain the striking action before the previous nailing cycle is completed will not stop the motor from rotating, allowing for continuous nailing in the next cycle. This significantly improves nailing efficiency and enables high-speed nailing. Simultaneously, it effectively avoids striking failure and misjudgment-induced shutdowns, ensuring safety and reliability.

[0040] In addition to the embodiments described above, the present invention may have other implementations. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A high-speed nail-driving control method for a nail gun, the nail gun comprising a housing with a handle, a control circuit, and... The energy storage mechanism consists of a cylinder and a piston located inside the housing; The striking mechanism consists of a telescopic nozzle attached to the nail-driving seat at the front of the housing. The nail-driving mechanism consists of a firing pin that is connected to the piston and extends to the nozzle; The lifting mechanism consists of a motor-driven wheel that meshes with the firing pin; Its features are: The control circuit contains intelligent devices whose signal input terminals are respectively connected to a trigger switch, a touch switch, a mode switching button, and a rotation sensor at the drive wheel; The control output terminal of the intelligent device is connected to the controlled terminal of the motor, and control is performed according to the following steps: Step 1: Continuous Fire Detection – After powering on, determine if it is in continuous fire mode based on the signal from the mode switch button; otherwise, enter single-fire control mode. Step 2, Firing Detection – Determine whether firing has occurred based on the trigger switch signal. If yes, proceed to the next step; otherwise, return to the previous step. Step 3, Drive Lifting - Start the motor to rotate, and the lifting mechanism drives the piston through the firing pin to compress air and store energy to fire the nail; Step 4, Rotation Detection – From the moment the motor starts rotating until the drive wheel rotates to a predetermined initial rotation angle greater than 15° and less than 360°, determine whether a rotation sensor signal is detected. If so, proceed to the next step immediately; otherwise, proceed to Step 7. Step 5, Continuous Rotation – From the moment the rotation sensor signal is detected, the control motor continues to drive the drive wheel to rotate by a first predetermined angle or for a first predetermined time, and proceeds to the next step; Step 6, Touch Detection – Determine whether a touch switch signal is received during the process of the drive wheel rotating from the first predetermined angle to the second predetermined angle or from the first predetermined time to the second predetermined time. If not, proceed to the next step; if yes, return to step 3. Step 7: Braking and stopping the rotation – Control the motor to brake and stop rotating.

2. The high-speed nailing control method for a nail gun according to claim 1, characterized in that: The second predetermined angle corresponds exactly to the engagement position between the first side tooth of the firing pin and the first drive roller of the drive wheel.

3. The high-speed nailing control method for a nail gun according to claim 1, characterized in that: The second predetermined rotation angle is 250±15°.

4. The high-speed nailing control method for a nail gun according to claim 2 or 3, characterized in that: The first predetermined rotation angle is 100±10°.

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