JPH0618790Y2 - Electric nailer - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to an electric nailer that automatically drives nails, tacks, staples, etc. one by one. More details are summarized below. That is, when the operating mechanism of the known electric nailing machine reaches the inoperative position, the lever inside the trigger is used to operate the microswitch, and the motor is further rotated to disengage the lever from the inoperative position. thing. Also, after the driving operation is completed, the power is turned off, and at the same time, the electrodes of the motor are immediately connected to each other to actuate the electric brake to stop the motor quickly, which results in the distance between the cam and the ram. By increasing the value, ensure that the driving operation is performed when the rotation of the cam reaches a high speed when the motor is started next time. In addition, a safety lock is provided to improve safety.

[Prior art]

BACKGROUND ART Conventionally, an electric nailing machine controls a hammering operation such as a nail by turning on / off a micro switch by operating a trigger thereof. The operation of the conventional electric nailing machine will be described with reference to FIG. As shown in FIG. 7D, when the trigger is pushed, the lower end of the lever 100 provided on the upper side immediately turns on the micro switch 101 to supply power to the motor. As a result, when the started motor rotates the cam 102 in the direction of the arrow, the pin 10 provided on the cam 102 is rotated.
3 squeezes the ram 105, compressing a spring (not shown) in the ram 105. When the pin 103 is released from the pressing force of the ram 105 by the subsequent rotation of the cam 102, the compressed spring immediately repels the ram 105 to perform a nail driving operation. When the cam 102 subsequently rotates, the lever 1
00 is pushed toward one side, the rear end of the lever 100 is disengaged from the micro switch 101 (FIG. 7A), and the power supply to the motor is stopped. In this way, the driving operation is performed only once each time the trigger is pushed, so that the safety of the operation is ensured. Further, the cam 102 continues to rotate for some distance due to inertial movement (FIG. 7B) and stops at the position of FIG. 7C, and the lever 100 waits for the trigger to loosen before the spring 104 moves. The action restores the vertical position shown in FIG. 7D, that is, the initial non-rotated position, and waits for the next operation of the trigger.

[Technical problems to be solved]

Since the conventional product has the above-described configuration, the cam 102
When the operator's trigger operation is unstable or the supplied power is insufficient, the operator may stop at the position shown in FIG. 7A. In this case, the lever 100 rotates slightly and stops in an inclined state, so that even if the trigger is pushed, the lower end of the lever 100 cannot turn on the micro switch 101. The positions of the cam 102 and the lever 100 at this time are called inoperative positions. Conventionally, when such a phenomenon occurs, the micro switch 101 in the main body of the electric nailing machine is turned on by a driver (screwdriver) or the like to turn on the cam 10.
2 has a disadvantage that the next operation cannot be performed unless the lever 100 and the lever 100 are moved from the inoperative position. Further, at the end of the driving operation, the cam 102 does not stop suddenly but moves a little due to the inertial motion of the motor. Therefore, the distance between the pin 103 of the cam 102 and the ram 105 may approach and stop. There is. In this case, at the time of the next driving operation, when the rotation speed of the motor is slow, the driving operation is started and a load is applied to the motor, so that the starting load of the motor is large, and as a result, the efficiency of the motor is low, In addition, there is a drawback that the power consumption becomes large. The present invention has been made in view of the above problems,
When the lever and cam reach the inoperative position, it automatically corrects it, the function to save the electric power required for the motor by improving the motor rotation efficiency, and the electric nailer when not in use. An object of the present invention is to provide an electric nailing machine that can realize a safety function that ensures safety.

[Means for Solving the Problems]

To achieve the above object, an electric nailing machine according to the present invention includes a trigger moved to a release position and an operating position, a cam connected to an output shaft of a reduction gear driven by a motor, and a trigger. It is movably attached and linked to the cam via a locking member so as to engage and disengage with the rotation of the cam. When it is disengaged from the cam, it is returned to the first position by the urging force, and when it is locked to the cam. A lever which is rotated to a second position, a ram which is slidably movable and is pushed and moved by the rotation of the cam, and a rear side of the rear end portion of the lever when the trigger is moved to an operating position. , A first micro switch provided so as to be turned on by being pressed by the lever in the first position, and turned off by being rotated and released to the second position by the lever, and the lever side. Towards,
A second micro switch provided to be turned on when the lever is in the second position and turned off when the lever is in the first position when the trigger is moved to the release position; The switch and the second micro switch each have an electric circuit for supplying power to the motor when the switch is ON. In addition, the electric nailing machine of the present invention has a motor brake that operates by turning off the power, and stops the motor quickly after turning off the power to increase the distance between the cam and the ram so that the next time the motor starts. The feature is that the driving operation by the ram is performed after the rotation speed of the cam reaches a high speed. Further, in the electric nailing machine of the present invention, the anode of the power source is directly connected to the anode of the motor and the NC contact of the first micro switch,
The cathode of the power source is directly connected to the NO contacts of the first and second micro switches, and the cathode of the motor is the CO of the second micro switch.
It is characterized by comprising an electric circuit which is directly connected to the M contact and the COM contact of the first micro switch is directly connected to the NC contact of the second micro switch. In addition, the electric nailer of the present invention is
It is characterized in that when it moves to one side, the rotation of the lever is locked, and when it moves to the other side, a safety lock that allows the rotation of the lever is movably inserted.

[Action]

If the cam stops at the inoperative position and the lever stops at the second position, and the trigger is returned to the release position, the second micro switch is turned on by the lever, and the motor is powered. As it is supplied, the cam rotates again to return from the inoperative position to the operating position. As a result, when the trigger is loosened after the end of the nailing operation and the cam is stopped at the non-operating position, the cam can be forcibly returned to the operating position without fail. For this reason,
The lever 3 always returns from the second position to the first position.
That is, the cam and the lever are always returned to the operating position without stopping at the non-operating position. Further, after the driving operation is completed, the electrodes of the motor are immediately connected to each other at the same time when the power is turned off by the micro switch, so that the action of the electric brake occurs and the motor is quickly stopped. Therefore, since the distance between the cam and the ram becomes large, the driving operation is performed after the rotational speed of the cam becomes high when the motor is started next time. It requires less current. Furthermore, when the electric nailing machine is not used, the trigger is fixed by moving the safety lock in a predetermined direction, so that the electric nailing machine does not operate even if a pressing force acts on the trigger.

【Example】

Next, an embodiment of the present invention will be described with reference to the drawings of FIGS. FIG. 1 is a perspective view of an electric nailing machine according to the present invention,
FIG. 2 is an exploded perspective view of FIG. As shown in FIG. 2, the electric nailing machine of the present invention mainly has a trigger 1, a lever 3, a cam 5, a first micro switch 6 and a second micro switch 7. The trigger 1 is provided in a substantially middle portion of the main body of the electric nailing machine and is used for controlling the driving operation. That is, the driving operation is performed by pushing the trigger 1 to the operation position, and after the operation is completed, the trigger 1 is loosened and returned to the release position. The lever 3 is rotatably attached with the pivot 1a inside the trigger 1 as a fulcrum, and is urged by the urging force of the spring 2 so as to always maintain a non-rotation position described later. As shown in FIGS. 3A and 3B, the lever 3 is provided such that the side edge portion of the upper end portion 31 of the lever 3 is engaged with and disengaged from a pin 52 which is a locking member protrudingly provided on the small diameter portion of the cam 5. ing. That is, the lever 3 is linked to the cam 5 via the pin 52. Therefore, as shown in FIG. 3A, when the lever 3 is disengaged from the pin 52, the lever 3 is in a vertical state parallel to the longitudinal direction of the trigger 1, as shown by the biasing force of the spring 2, that is, , Is returned to the non-rotating position (first position). On the other hand, as shown in FIG. 3B, when the lever 3 is locked by the pin 52, the lever 3 is moved by the rotation of the cam 5 and is in an inclined state as shown in FIG. 2 position). A first micro switch 6 is provided behind the rear end 32 of the lever 3. As shown in FIG. 3A,
When the trigger 1 is pushed to the operating position in the direction of the arrow when the lever 3 is in the non-rotating position, the end of the rear end 32 of the lever 3 that moves along with this is the first micro switch 6
It is designed to be turned on by pressing. On the other hand, as shown in FIG. 3B, the pin 52 of the cam 5 pushes the side edge portion of the upper end portion 31 of the lever 3 to rotate the lever 3 from the non-rotated position to the rotated position. Then, the rear end portion 32 of the lever 3 is separated from the first micro switch 6 and is turned off. Further, on the side of the lever 3, the second micro switch 7
Is provided. As shown in FIG. 3C, the second micro switch 7 is pressed by the projection 33 of the lever 3 to be turned on when the lever 1 is in the turning position when the trigger 1 is returned to the release position. It has become so. On the other hand, unlike this, when the lever 3 is in the non-rotating position when the trigger 1 is returned to the release position, the protrusion 33 of the lever 3 does not press the second micro switch 7, so that the second micro switch 7 is turned on. Instead, it remains in the OFF state. When the first micro switch 6 and the second micro switch 7 described above are turned on, the driving operation is performed by supplying the power source 50 to the motor 9 by an electric circuit (not shown). The cam 5 is connected to the output shaft 81 of the reduction gear 8 by a screw 51, and the input shaft of the reduction gear 8 is connected to the drive shaft of the motor 9. Therefore, the rotational force of the motor 9 is transmitted to the cam 5 via the reduction gear 8 to rotate it. Further, the ram 4 provided so as to be slidable is brought into contact with the pin 52 of the cam 5 to be pushed, and is driven by the elastic force of the spring 20 provided at the rear of the ram 4. ing. The fixing screw 30 can be used to hold the spring 20 so as not to drop from the main body of the electric nailing machine and to adjust the amount of force with which the spring 20 presses the ram 4. Next, the operation of the above configuration will be described in detail. First, as shown in FIG. 3A, when the trigger 1 is pushed to the operating position in the arrow direction, the lower surface of the rear end portion 32 of the lever 3 in the non-rotating position moves the first micro switch 6 downward. Press it to turn it on. As a result, when the cam 5 rotates in the direction of the arrow when the power is supplied to the motor 9 via the power supply circuit and driven, the pin 52 of the cam 5 causes the pin 52 of the cam 5 to move.
The spring 20 provided in the main body of the electric nailing machine is compressed in order to abut and strongly move it. When the cam 5 continues to rotate and releases the pressure on the ram 4, the spring 20 compressed so far instantly repels the ram 4 in the opposite direction, so that the guide groove 4 provided inside the main body of the electric nailing machine is pressed.
Drive out only one nail etc. stored in 0. After the nail is hammered in, as shown in FIG. 3B, the pin 52 of the cam 5 pushes the right edge of the upper end 31 of the lever 3 from the side to push the lever 3 laterally. Since the lever 3 is rotated to the rotation position, the rear end portion 32 of the lever 3 pressing the first micro switch 6 is separated from the first micro switch 6. As a result, the rotation of the motor stops, so that the cam 5 and the pin 52 also stop. At this time, the trigger 1 is still in the pushed state and has not been loosened yet, that is, has not returned to the release position. Next, as shown in FIG. 3B, when the pin 52 of the cam 5 is in contact with the right edge of the upper end 31 of the lever 3, that is, when the cam 5 stops at the inoperative position, Lever 3
Since the right edge portion of the upper end portion 31 is locked by the pin 52, cannot return to the non-rotated position in the rotated position. At this time, the protrusion 33 provided on the right side in the vicinity of the upper end portion 31 of the lever 3 is at a position close to the lower side of the second micro switch 7. Next, as shown in FIG. 3C, when the trigger 1 is loosened and returned to the release position in the direction of the arrow, the protrusion 33 of the lever 3 moves upward and comes into contact with the second micro switch 7 to turn it on. To operate. As a result, the power is supplied to the motor through the electric circuit, so that the cam 5 is rotated again and the pin 52 is rotated clockwise. When the pin 52 is moved to the position shown in FIG. 3A, the pin 52 separates from the right edge of the upper end 31 of the lever 3, so that the lever 3 is rotated clockwise by the urging force of the spring 2. And return to the non-rotational position. The protrusion 33 of the lever 3 moves to the right and separates from the second micro switch 7 as the lever 3 rotates, so that the protrusion 33 is turned off and the driving of the motor is stopped. Therefore, the cam 5 stops at the position shown in FIG. 3A. That is, the correction operation of the cam 5 and the lever 3 is performed, and the series of driving operations are completed. When the cam 5 does not stop at the inoperative position (FIG. 3B) but rotates to the state shown in FIG. 3A due to inertial movement, the second micro switch 7 causes the protrusion of the lever 3 to move. Since it is not pressed by 33, it is not turned on. That is, the correction operation is not performed, but the lever 3 is
After returning to the non-rotational position shown in FIG. A, a series of driving operations is completed. As described above, when the second micro switch 7 is turned on, the cam 5 is rotated by the motor and separated from the inoperative position, so that the cam 5 is rotated from the inoperative position to the operative position. As a result, the lever 3 is returned to the non-rotatable position, so that the second micro switch 7
Is turned off. That is, when the trigger 1 is loosened and returned to the release position after the nailing operation is finished, if the cam 5 is stopped at the inoperative position, the cam 5 can be forcibly returned to the normal position. it can. For this reason, the lever 3 is always returned from the rotating position to the non-rotating position, so that the next nail driving operation is not hindered. Also, each time the trigger 1 is pushed once, a driving operation is performed once, so that safety is secured as in the conventional case. Another feature of the present invention is that the electric circuit is used to cause the motor to perform a braking action, and when the power is turned off, the motor 9 is quickly stopped at the most advantageous position, so that the force for the next driving can be improved. It is possible to reduce the electric current at the time of starting the motor and to save the electric power at the same time. That is, as shown in FIG. 4, the anode of the power source 50 is directly connected to the anode of the motor 9 and the NC contact of the second micro switch 7, and the cathode of the power source 50 is connected to the first and second micro switches 6, 7. The motor 9 is directly connected to the NO contact, the cathode of the motor 9 is directly connected to the COM contact of the second micro switch 7, and the COM contact of the first micro switch 6 is connected to the NC contact of the second micro switch 7. In the above circuit configuration, when the trigger 1 is pressed, the rear end portion 32 of the lever 3 immediately operates the first micro switch 6, so the NO of the first micro switch 6 is set.
The contact conducts to the COM contact. As a result, the cathode of the power supply 50 immediately contacts the NO contact of the first microswitch 6 and the C contact.
It conducts to the cathode of the motor 9 through the OM contact, then the NC contact and the COM contact of the second micro switch 7. At this time, since the anode of the power source 50 is directly connected to the anode of the motor 9, one power source circuit is configured by the above circuit and the motor 9 is started. On the other hand, when the lever 52 releases the first microswitch 6 by the pin 52 of the cam 5 pushing the lever 3 to the oblique position (rotational position), the cathode of the power source 50 is the first microswitch 6 Alternatively, it becomes impossible to conduct electricity to the cathode of the motor 9 via the second micro switch, so that the power supply to the motor 9 is cut off. If the cam 5 is in the inoperative position, the lever 3
It is impossible to turn on the first micro switch 6 at the rear end portion 32. However, when the trigger 1 is loosened, the protrusion 33 pushes the second micro switch 7 to turn it on, so that the cathode of the power supply 50 immediately becomes conductive with the NO contact of the second micro switch 7 and this. It conducts to the cathode of the motor 9 via the COM contact. Therefore, by forming one power supply circuit, the motor 9 is rotated by being supplied with power. In addition, when the protrusion 33 of the lever 3 releases the second micro switch 7 after the trigger 1 is released and the lever 3 returns to the non-rotating position, the cathode of the power source 50 passes through the second micro switch 7. Then, it becomes impossible to conduct electricity to the cathode of the motor 9, and this also achieves the purpose of turning off the power. At the same time when the first micro switch 6 and the second micro switch 7 are released, the cathode of the motor 9 is connected to the COM contact and NC contact of the second micro switch 7, the COM contact and NC contact of the first micro switch 6, and the power supply 50. It conducts to the anode of the motor 9 via the anode. Therefore, the motor 9 acts as an electric brake by the action similar to that of the generator, and brakes the motor 9 to quickly stop it. The purpose of such a braking action is to increase the distance between the pin 52 of the cam 5 and the ram 4 by the cam 5 pressing the ram 4 and then quickly stopping it, so that the next time. The driving operation is performed only after the started motor 9 reaches a high speed. FIG. 5 is a characteristic curve diagram of a general motor. As shown in the figure, the lighter the starting load (TORQUE) of the motor 5, the faster the rotation speed (SPEED), and the required current (CURREN).
It can be seen that T) decreases and efficiency (EFFICIENCY) also increases. The electric nailing machine according to the present invention has the above-mentioned circuit configuration,
Since a large distance between the cam and the ram is secured by the action of the electric brake, when the motor is started next time, the driving operation is performed after the rotational speed of the cam becomes high. Therefore, since the starting load is small due to the above-mentioned principle,
The efficiency of the motor can be increased, and the current can be reduced to save power. In addition to the above, the electric nailing machine according to the present invention has a safety lock 60 as shown in FIG. This safety lock 60 is movably inserted into the main body of the electric nailing machine, and when the electric nailing machine is not used, when the safety lock 60 is moved upward in FIG. The end portion 32 is locked, the trigger 1 is moved, and the first
It is impossible to turn on the micro switch 6. Therefore, even if pressing force is applied to the trigger 1 in this state, the trigger 1 does not move, so the electric nailer is not driven and safety is ensured. When driving a nail, the safety lock 60 may be moved downward in FIG. 6 to release the lever 3.

[Effect of device]

As described above, the electric nailing machine of the present invention has the following effects. (1) When the lever and the cam are stopped at the non-operating position and the trigger is loosened to return to the open position, the second micro switch is turned on by the lever to rotate the motor. , The inoperative position is corrected to the operating position. (2) When the first micro switch or the second micro switch is turned off, the motor is immediately stopped by the action of the electric brake, so that a large distance between the cam and the ram is ensured. Since the starting load of the motor at the time of the driving operation is reduced, the efficiency of the motor is improved and the electric power is saved. (3) By providing the safety lock that is interlocked with the lever, the trigger is fixed when the electric nailer is not in use, so that the safety of the electric nailer is ensured.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, FIG. 2 is an exploded perspective view of the same, FIG. 3 is an operation explanatory view, FIG. 4 is an electric circuit diagram, and FIG.
FIG. 6 is a characteristic curve diagram of a general motor, FIG. 6 is a perspective view showing a relationship between a trigger, a lever and a safety lock, and FIG. 7 is an operation explanatory diagram for explaining problems in a conventional electric nailing machine. . 1 ... Trigger, 2 ... Spring, 3 ... Lever, 31 ... Upper end, 32 ... Lower end, 33 ... Protrusion, 4 ... Ram, 5 ... Cam, 6 ... First micro switch, 7 …… Second micro switch, 9 …… Motor, 50 …… Power supply, 60 …… Safety lock.

Claims (4)

[Scope of utility model registration request] 1. A trigger which is moved to a release position and an operating position, a cam which is connected to an output shaft of a reduction gear driven by a motor, and which is rotatably attached to the trigger and is attached to the cam for rotation thereof. Accordingly, they are linked via a locking member so as to be disengaged, and when released from the cam, they are returned to the first position by the biasing force, and when locked to the cam, they are rotated to the second position. Lever, a ram that is slidably movable, and is pressed and moved with the rotation of the cam, and is located at the first position when the trigger is moved to the operating position behind the rear end of the lever. A first microswitch provided to be turned on by being pressed by the lever, and turned off when the lever is pivoted to a second position and released, and a lateral side of the lever, The trigger is released A second micro switch provided to be turned on when the lever is in the second position and turned off when the lever is in the first position when moved to the position; An electric nailing machine, comprising: an electric circuit that supplies power to the motor when the switch and the second micro switch are ON. 2. A motor brake which operates when the power is cut off, and the motor is quickly stopped after the power is cut off to increase the distance between the cam and the ram so that the rotation speed of the cam can be increased at the next motor start. The electric nailing machine according to claim 1, wherein the driving operation is performed by the ram after the speed reaches a high speed. 3. An anode of the power source is directly connected to an anode of the motor and an NC contact of the first micro switch, and a cathode of the power source is the first.
And the NO contact of the second micro switch, and the cathode of the motor to the COM contact of the second micro switch.
The electric nailing machine according to claim 1, further comprising an electric circuit in which the COM contact of the first micro switch is directly connected to the NC contact of the second micro switch. 4. A safety lock movably inserted into the main body of the electric nailing machine to lock the rotation of the lever when moved to one side and to allow the rotation of the lever when moved to the other side. The electric nailing machine according to any one of claims 1 to 3.