CN100344412C - Electric nail gun that automatically reduces hammer force when there is no nail body - Google Patents

Abstract

An electric nailing gun able to automatically reduce the force of hammer without nail body features that a detector is arranged on the nail box of said electric nailing gun and connected with a control circuit, when the nail-pushing plate for pushing nail body is at predefined position on said nail box, a control signal is sent to said control circuit, a counter in said control circuit begins to count the impact times of hammer, and when the counter reaches predefined value, said control circuit controls said electric nailing gun to reduce its force.

Description

Electric nail gun that automatically reduces hammer force when there is no nail body

technical field

The invention relates to an electric nail gun, in particular to an electric nail gun which automatically reduces the force of a hammer when there is no nail body.

Background technique

Commonly used electric nail guns, after the nail body in the nail magazine is used up, the hammer can still be operated continuously by pressing the trigger trigger switch. Impact on the structure around the nail gun mouth of the electric nail gun. Long-term impact will damage the hammer and the electric nail gun body. Some electric nail guns are designed to install elastic buffers on the side of the nail gun mouth inside the electric nail gun. Such as a rubber pad, but the impact frequency and speed of the hammer are extremely fast, and the service life of the buffer is extremely short. The material will deteriorate and harden in a short period of time and lose the buffering effect. Therefore, in some countries such as the United States, the safety regulations require that electric nail guns need After many times of nail-free hitting tests for a long time, it will be a big challenge for those who want to manufacture and develop more powerful electric nail guns.

In the design of the nail body detector installed in the electric nail gun, a detector is installed on the top of the nail box. When the nail body is used up, the push piece that pushes the nail body to the nailing preparation position triggers the detector. , which stops the nailer from functioning. However, the nail body is not a precise mechanical structure, and generally large tolerances are allowed during manufacturing. The nail magazine and the electric nail gun itself also have a certain tolerance. Therefore, using the detector to judge whether the nail body is used up is prone to misjudgment. If the nail body cannot be used up, the electric nail gun will operate without the nail body, or after the nail body is used up, the electric nail gun will still maintain the operation mode with the nail body.

Contents of the invention

The main purpose of the present invention is to provide an electric nail gun that automatically reduces the force of the hammer when there is no nail body, which can avoid the structure damage of the electric nail gun caused by the direct impact of the hammer on the electric nail gun when there is no nail body.

In order to achieve the above object, an electric nail gun that automatically reduces the force of the hammer when there is no nail body provided by the present invention includes:

a gun body;

A hammer is arranged in the gun body and moves back and forth along a straight moving path in the gun body;

a first elastic member, connecting the hammer and the gun body, for maintaining the hammer at one end of the moving path;

At least one coil is arranged in the gun body, and when receiving current, it can generate a magnetic field to attract the hammer to move along its moving path toward the other end of the moving path, so as to cause the impact action of the hammer;

A nail box has a box body, a nail push piece and a second elastic member; the box body is used to accommodate a plurality of nail bodies, and can allow the nail body to move along a predetermined path therein; the nail push piece is provided with in the box body, and can move along the moving path of the nail body in the box body; the elastic piece is connected to the box body and the nail push piece respectively, so that the nail push piece can be pushed due to the elastic force of the elastic piece the nail body moves within the box;

A control circuit for controlling the energization state of the coil, the control circuit including a counter for counting the number of impacts of the hammer;

A detector is arranged on the nail box and connected to the control circuit. When the nail pushing piece is located at a predetermined position on the nail box, a control signal can be sent to the control circuit to make the counter start counting the The number of impacts of the hammer, and when the counter counts to a predetermined value, the control circuit reduces the current input to the coil, thereby reducing the impact force of the hammer.

Wherein the detector includes a transmitting end and a receiving end, respectively located on the two sides of the nail box, the transmitting end can emit a detection signal to be received by the receiving end, and the detection signal path is connected with the nail push piece The movement paths of the detectors are staggered, and when the detection signal is not blocked by the nail body and the nail push piece, the detector transmits the control signal to the control circuit.

Wherein the detector is a contact switch, which is arranged at a predetermined position on the nail box. When the nail push piece reaches the predetermined position, it touches the trigger switch, so that the detector emits the control signal to the control circuit.

It also includes a safety switch and a guide rod, the safety switch is connected to the control circuit to control the electric nail gun; one end of the guide rod protrudes from the nail gun mouth of the electric nail gun, and the other end is connected to the safety switch, It is used to switch the safety switch, and the electric nail gun can only be operated when the nail gun port of the electric nail gun touches the surface of the work object, the guide rod is pushed against and the safety switch is activated.

It also includes a warning device connected to the control circuit. When the counter counts to a predetermined value, the control circuit can activate the warning device to send out a warning signal.

Wherein when the control circuit interrupts receiving the control signal during the counting process of the counter, the counter will be reset to zero and stop counting; when the impact force of the hammer is reduced, if the control circuit interrupts receiving the control signal, the counter will Return to zero and restore the original current input to the coil, so that the hammer returns to normal impact force.

Description of drawings

The preferred embodiments of the present invention are listed below, and are described in detail in conjunction with the following drawings, wherein:

Fig. 1 is a schematic structural diagram of a preferred embodiment of the present invention.

Fig. 2 is a schematic structural view of the nail magazine in a preferred embodiment of the present invention.

FIG. 3 is a schematic diagram of a partial structure of FIG. 2 , revealing a state where the transmitting end and the receiving end are blocked by nails.

FIG. 4 is a schematic diagram of a partial structure of FIG. 2 , revealing a state where the transmitting end and the receiving end are not blocked by the nail body and the nail pushing piece.

Detailed ways

1 and 2, a preferred embodiment of the present invention provides an electric nail gun (100) that automatically reduces the force of the hammer when there is no nail body. It includes:

A gun body (10);

An impact device (20) includes a hammer (21), a first elastic member (22), and a coil (23); the hammer (21) is located in the gun body (10), and can be The gun body (10) reciprocates along a predetermined path; the first elastic member (22) connects the hammer (21) and the gun body (10) to maintain the hammer (21) at the predetermined One end of the path; the coil (23), which is located in the gun body (10), can generate a magnetic field to attract the hammer (21) to move along its moving path toward the other end of the moving path when receiving current, resulting in The impact action of the hammer (21);

A nail box (30) has a box body (31), a nail pushing piece (32) and a second elastic member (33); the box body (31) is used to accommodate a plurality of nail bodies (34), and Allow the nail body (34) to move along a predetermined path, the moving path of the nail body (34) is interlaced with the moving path of the hammer (21), when each nail body (34) reaches the hammer (21) During the moving path, each nail body (34) can accept the impact of the hammer (21); The path that body (34) moves moves; The second elastic member (33) is connected to the box body (31) and the push nail piece (32) respectively, so that the push nail piece (32) can be pushed by the second elastic piece (33) promotes the nail body (34) to move in the box body (31);

A control circuit (40), used to control the energization state of the coil (23), the control circuit (40) includes a counter (not shown in the figure, it can be a programmable integrated circuit), used to count the hammer (21) the number of impacts;

A trigger (50), connected to the control circuit (40), serves as a trigger switch for the electric nail gun (100) to start the nailing action;

A safety device (60) includes a safety switch (61) and a push rod (62); the safety switch (61) is connected to the control circuit (40) for opening and closing the electric nail gun (100) Power supply; one end of the ejector rod (62) protrudes from the nail gun mouth (11) of the electric nail gun (100), and the other end is connected to the safety switch (61) to control the safety switch (62). The muzzle (11) is sure to abut against the surface of the work object, so that the ejector rod (62) is abutted to activate the safety switch (61), and the electric nail gun (100) can only operate;

a warning device (70), connected to the control circuit (40), to accept the activation of the control circuit (40) to send a warning signal;

A detector (80) is located on the nail box (30), and several wires are connected to the control circuit (40), so that when the nail pushing piece (32) is located at a predetermined position on the nail box (30), , can send a control signal (H) to the control circuit (40), so that the control circuit (40) can carry out the corresponding control program, the detector (80) can be a contact trigger switch, the push pin The chip (32) touches directly to trigger the sending of the control signal (H), and it can also be a non-contact detector, such as the detector (80) used in this embodiment, which includes a transmitter (81) and a receiving end (82), are arranged on the two sides of this box body (31), and this transmitting end (81) can transmit a detection signal (S) to be received by this receiving end (82), and this detection The moving path of the signal (S) intersects with the moving path of the nail body (34) and the nail pushing piece (32); After pushing toward the exit and passing through the detection signal (S) path between the transmitting end (81) and the receiving end (82), the detection signal (S) is not affected by the nail body (34) or the nail push piece. (32) Blocking makes the receiving end (82) receive the detection signal (S), and at this time the detector (80) sends the control signal (H) to the control circuit (40) (as shown in Figure 3 and 4).

The above are the constituent elements of the preferred embodiment of the present invention, and then further explain its operation mode.

When the control circuit (40) does not receive the control signal (H), the electric nail gun operates normally. After the trigger (50) is pressed, the control circuit (40) outputs the current to the coil (23) Constant, make this hammer (21) striking force remain constant, to carry out normal nailing operation;

When the control circuit (40) receives the control signal (H), the counter (not shown) in the control circuit (40) begins to count the number of impacts of the hammer (21) until the hammer (21) ) the number of impacts reaches a predetermined value, at this time the control circuit (40) will reduce the current input to the coil (23) due to the completion of the counting of the counter (not shown), so as to reduce the driving magnetic field strength, thereby making the impact The impact of the hammer (21) is reduced to minimize the impact of direct air strikes with the original force when there is no nail body, and the warning device (70) can be controlled to send a warning signal when the impact force is reduced, so as to achieve protection and warning. effect.

Due to the lack of precision of the nail body (34), when the control signal (H) is sent to the control circuit (40), there may still be a nail body (34) in the nail box (30), so the counter can be used to (Not shown in the figure) counting, just reduce this hammer (21) impact force after reaching a predetermined value; If in the counting process (this moment has not yet reduced this hammer (21) impact force) this control circuit (40) interrupts Receive the control signal (H), then stop counting the counter and reset it to zero; if you stop receiving the control signal (H) after reducing the impact force of the hammer (21), then reset the counter to zero and make the motor The nail gun (100) returns to normal impact force, which can avoid reducing the impact force of the hammer (21) to affect normal work when there is a nail body, ensures that the nail body (34) is fully fired, and can also prevent the hammer (21) from still firing when there is no nail body. The electric nail gun (100) is damaged by continuous operation with normal impact force.

The above description is only a preferred feasible embodiment of the present invention, so all equivalent structural changes made by applying the description of the present invention and the scope of the patent application should be included in the scope of the patent of the present invention.

Claims (6)

1. one kind is not had the electric nail gun that reduces striking force when following closely body automatically, and it includes:

One rifle body;

One hammer is located in this rifle body, and mobile route moves back and forth along a straight line in this rifle body;

One first elastic component links this hammer and this rifle body, is positioned at an end place of this mobile route in order to keep this hammer;

At least one coil is located in this rifle body, produces when being subjected to electric current that the other end of this hammer of a magnetic field suction along its mobile route towards this mobile route moves and the impact start that causes this hammer;

One nail casket has a casket body, a pushing slice of nail and one second elastic component; This casket body and function is with ccontaining most nail bodies, and for this nail body in wherein along predetermined path movement, the mobile route of this nail body and the mobile route of this hammer are staggered, when respectively this nail body arrives the mobile route of this hammer, this is respectively followed closely body and accepts this hammer impacts: this pushing slice of nail is located in this casket body, and the path movement that moves along this nail body in this casket body; This elastic component is linked to this casket body and this pushing slice of nail respectively, moves in this casket body because of the elastic force of this elastic component promotes this nail body with this pushing slice of nail;

One control circuit, in order to control the "on" position of this coil, this control circuit includes a counter, in order to count this hammer impacts number of times;

One detector, be located on this nail casket, and connect this control circuit, when this pushing slice of nail is positioned at a precalculated position on this nail casket, send a control signal to this control circuit, make this counter begin to count this hammer impacts number of times, and when this rolling counters forward to one predetermined value, this control circuit just lowers the electric current of this coil of input, and reduces the impulsive force of this hammer.

2. according to the described a kind of electric nail gun that nail reduces striking force during body automatically that do not have of claim 1, it is characterized in that, wherein this detector includes a transmitting terminal and a receiving terminal, lay respectively on the two side faces of this nail casket, this transmitting terminal emission one detects signal and is received by this receiving terminal, and this mobile route that detects signal path and this pushing slice of nail is staggered, and when this detects signal when not blocked by this nail body and pushing slice of nail, this detector is launched this control signal to this control circuit.

3. according to the described a kind of electric nail gun that nail reduces striking force during body automatically that do not have of claim 1, it is characterized in that, wherein this detector is a touch switch, be arranged at the precalculated position on this nail casket, when this pushing slice of nail arrives this precalculated position, contact this trigger switch, make this detector launch this control signal to this control circuit.

4. according to the described a kind of electric nail gun that nail reduces striking force during body automatically that do not have of claim 1, it is characterized in that wherein also include a safety switch and a guide rod, this safety switch is connected to this control circuit to control this electric nail gun; One distal process of this guide rod is for the nail muzzle of this electric nail gun, the other end is linked to this safety switch, in order to switch this safety switch, when the certain butt work of the nail muzzle object surface of this electric nail gun, make this guide rod be subjected to contact and start this safety switch, this electric nail gun beginning operates.

5. according to the described a kind of electric nail gun that nail reduces striking force during body automatically that do not have of claim 1, it is characterized in that, wherein also include an alarming device, be connected to this control circuit, behind this rolling counters forward to one predetermined value, this control circuit starts this alarming device and sends alerting.

6. according to the described a kind of electric nail gun that nail reduces striking force during body automatically that do not have of claim 1, it is characterized in that wherein this control circuit interrupts receiving this control signal in this rolling counters forward process, then this counter is made zero and stop counting; After the impact power that reduces this hammer, if this control circuit interrupts receiving this control signal, this counter is made zero and recover the electric current of former this coil of input, make hammer reply the normal power of impacting.