NAILING MACHINE

An electric nailing machine capable of continuous driving is provided. A driving unit 10 which drives a nail N supplied to a driving position a includes a cylinder unit 11 having a cylinder 12 and a piston 13, a driving rod 14 which is consecutively provided on the piston 13 and slidably penetrates a cylinder cap 12b, a driving spring 15 which biases the piston 13 in a driving direction, and a moving unit 16 which moves the piston 13 in a counter-driving direction against a biasing force of the driving spring 15 and has a brushless motor 17 and power converting means 18 which converts a rotary motion of the brushless motor 17 to a linear motion in the counter-driving direction of the piston 13, in which the power converting means 18 has a sector gear 21 rotated/driven by the brushless motor 17 and a rack gear 22 meshed with the sector gear 21 and mounted on the piston 13, in which, when the piston 13 moves to a predetermined position in the counter-driving direction, meshing between the sector gear 21 and the rack gear 22 is disengaged.

TECHNICAL FIELD

The present invention relates to an electric nailing machine.

BACKGROUND ART

This type of nailing machines includes the one disclosed in Patent Literature 1, for example. This nailing machine50includes, as shown inFIG.10, a nail supply unit51which supplies nails to a driving position and a driving unit52which drives the nail supplied to the driving position, and the driving unit52has a plunger53supported at the driving position of the nail, capable of approaching/separation, a spring (not shown) which biases the plunger53to a direction separating from the driving position of the nail, a rack gear54mounted on the plunger53, a blade55which is mounted at a distal end of the plunger53and drives the nail supplied to the driving position, a motor57which is ON/OFF driven by a trigger switch56disposed on a handle portion, a drive gear58mounted on a rotating/drive shaft57aof the motor57, a driven shaft (not shown) disposed in parallel with the rotating/drive shaft57a, a flywheel59rotatably supported by this driven shaft through a clutch mechanism (not shown), and a pinion60mounted on the driven shaft and meshed with the rack gear.

In this nailing machine50, as shown inFIG.11, when a worker grips the handle portion and pulls the trigger switch56, the motor57is driven, a rotating/drive force of the motor57is transmitted from the drive gear58to the flywheel59, and the flywheel59is rotated/driven. At this time, since the clutch mechanism is OFF, the flywheel59is not coupled with the driven shaft, the flywheel59idles with respect to the driven shaft, and though power transmission from the flywheel59to the driven shaft is shut down, after predetermined time has elapsed, the clutch mechanism is turned ON, the flywheel59and the driven shaft are coupled, a rotary motion of the flywheel59is transmitted to the driven shaft, and the driven shaft is rotated/driven. When the driven shaft is rotated/driven as above, the pinion60mounted on this driven shaft is also rotated integrally, the plunger53on which the rack gear54meshed with this is mounted is pushed out to a driving position side against the biasing force of the spring, a distal end of the blade55mounted on the distal end of the plunger53drives the nail supplied to the driving position, and the nail is driven into a nailed material W such as wood by this driving force.

CITATION LIST

Patent Literature

SUMMARY OF INVENTION

Technical Problem

In the aforementioned nailing machine50, when the worker pulls the trigger switch56, the flywheel59is immediately rotated/driven, but during a period until the predetermined time has elapsed, that is, during a period until the flywheel59is rotated at a constant speed, the clutch mechanism is not turned ON, a rotary force of the flywheel59cannot be transmitted to the driven shaft during that period, and the plunger53cannot be pushed out to a driving position side and thus, a certain degree of time is required until the nail is driven after the trigger switch56is pulled, which leads to a problem that the worker cannot sequentially drive nails.

Moreover, in the aforementioned nailing machine50, the nails are driven with a constant driving force and thus, the driving force cannot be adjusted in accordance with a length or a thickness of the nail, which leads to another problem that a plurality of types of nails cannot be handled.

Thus, a first object of the present invention is to provide an electric nailing machine capable of sequential driving and moreover, a second object is to provide a nailing machine capable of handling a plurality of types of nails.

Solution to Problem

In order to solve the aforementioned problems, an invention according to claim1is to provide a nailing machine, characterized by including a nail supply unit which supplies a nail to a driving position and a driving unit which drives the nail supplied to the driving position, in which the driving unit has a cylinder unit having a cylinder with a cylinder cap formed of an elastic member and a piston sliding in the cylinder, a driving rod which is consecutively provided on the piston and slidably penetrates the cylinder cap, a driving spring which biases the piston in a driving direction, and a moving unit which moves the piston in a counter-driving direction against a biasing force of the driving spring, the moving unit has an electric motor and power converting means which converts a rotary motion of the electric motor to a linear motion in the counter-driving direction of the piston, and the power converting means has a sector gear which is rotated/driven by the electric motor and a rack gear which is meshed with the sector gear and is mounted on the piston, and it is set such that, when the piston moves to a predetermined position in the counter-driving direction, meshing between the sector gear and the rack gear is set to be disengaged.

An invention according to claim2is characterized in that, in the nailing machine of the invention according to claim1, it is configured such that, when the driving rod drives the nail, air in a space defined by the cylinder and the piston is pushed out by the piston from the cylinder, and a driving-force adjustment unit which adjusts the driving force of the driving rod by adjusting push-out resistance of the air is provided.

An invention according to claim3is characterized in that, in the nailing machine of the invention according to claim1or2, the nail supply unit performs supply to the driving position by sending out a roll nail in a tangent direction of a winding part of the roll nail.

Advantageous Effects of Invention

As described above, the nailing machine of the invention according to claim1includes the cylinder unit having the piston to which the driving rod is consecutively provided, the driving spring which biases the piston in the driving direction, and the moving unit which moves the piston in the counter-driving direction against the biasing force of the driving spring and has the power converting means which converts the rotary motion of the electric motor to the linear motion in the counter-driving direction of the piston, the power converting means has the sector gear which is rotated/driven by the electric motor and the rack gear which is meshed with the sector gear and is mounted on the piston, and it is set such that, when the piston is moved to a predetermined position in the counter-driving direction, the meshing between the sector gear and the rack gear is disengaged and thus, when the sector gear is rotated by the electric motor, the sector gear is meshed with the rack gear mounted on the piston, whereby the piston moves to the counter-driving direction, the biasing force is accumulated in the driving spring with that, and at the time when the piston has moved to the predetermined position in the counter-driving direction, that is, at the time when the meshing between the sector gear and the rack gear is disengaged, the biasing force accumulated in the driving spring is released, the piston moves in the driving direction by the biasing force, and the driving rod drives the nail supplied to the driving position.

As described above, since this nailing machine can drive one nail while the sector gear makes one rotation, unlike the conventional nailing machine which cannot drive a nail during a period until the flywheel rotates at a constant speed from the time when the worker pulls the trigger switch, such an effect can be obtained that the nails can be sequentially driven.

Moreover, since this nailing machine has the cylinder cap formed of the elastic member, an impact when the piston collides against the cylinder cap can be absorbed, components are hardly broken, and nail driving operability is favorable.

Furthermore, the nailing machine of the invention according to claim2is configured such that, when the driving rod drives the nail, the air in the space defined by the cylinder and the piston is pushed out by the piston from the cylinder and includes the driving-force adjustment unit which adjusts the driving force of the driving rod by adjusting the push-out resistance of the air and thus, the driving force can be adjusted in accordance with the length, the thickness and the like of the nail to be driven, and a plurality of types of the nails can be handled.

Furthermore, since the nail supply unit of the nailing machine of the invention according to claim3is configured to supply the roll nail to the driving position by sending out the roll nails in the tangent direction of the winding part of the roll nail, sending-out resistance of the roll nail is small, and the nail can be supplied to the driving position smoothly and reliably with a small force.

DESCRIPTION OF EMBODIMENT

Hereinafter, an embodiment will be described by referring to drawings. As shown inFIGS.1to6, this nailing machine1is constituted by a main body portion2in which a driving unit10which drives a nail supplied to a driving position a is accommodated in a casing2a, a nail supply portion3which supplies the nail to the driving position a, and a power supply portion4detachably attached to the main body portion2, and the main body portion2and the nail supply portion3are coupled with each other.

The driving unit10includes, as shown inFIGS.5and6, a cylinder unit11having a cylinder12in which a cylinder cap12bformed of an elastic member is fitted on one end of a cylindrical cylinder main body12aand a piston13having a cylindrical piston rod13bconsecutively provided on a piston head13ain sliding contact with an inner peripheral surface of the cylinder main body12a, a driving rod14which extends in a driving direction from the piston head13aand slidably penetrates the cylinder cap12b, a driving spring15which biases the piston13in a driving direction and is internally attached to the cylindrical piston rod13b, a moving unit16which moves the piston13in a counter-driving direction against a biasing force of the driving spring15, and a trigger switch23capable of operating the moving unit16, and the moving unit16is constituted by a brushless motor17and power converting means18which converts a rotary motion of the brushless motor17to a linear motion in the counter-driving direction of the piston13.

The power converting means18has, as shown inFIGS.5, a sector gear21rotated/driven by the brushless motor17through a pair of bevel gears19and a plurality of spar gears20and a rack gear22meshed with the sector gear21and mounted on the piston rod13bof the piston13, and it is set such that, as shown inFIG.5(b), the piston13moves in the counter-driving direction by counterclockwise rotation of the sector gear21meshed with the rack gear22, and when the piston13moves to a predetermined position in the counter-driving direction, the meshing between the sector gear21and the rack gear22is disengaged.

In the cylinder cap12bof the cylinder unit11, as shown inFIG.7, a communication hole CH communicating between an inside and an outside of the cylinder12is formed, and it is configured such that, when the driving rod14drives the nail, an air in a space S defined by the cylinder12and the piston head13ais pushed out through the communication hole CH from the cylinder12.

The nail supply portion3includes, as shown inFIGS.1to5andFIG.7, a nail supply unit30which supplies nails to the driving position a and a driving-force adjustment unit41which adjusts a driving force of a nail N by the driving unit10, and the driving-force adjustment unit41is configured to adjust the driving force of the driving rod14by adjusting push-out resistance of the air in the cylinder12, which is pushed out by the piston13.

The nail supply unit30includes, as shown inFIGS.1to8, a nail-accommodating magazine31which accommodates roll nails RN in which a large number of nails N sequentially coupled through a wire are wound in a roll state, nail sending-out means32which sequentially sends out each of the nails N of the roll nail RN accommodated in the nail-accommodating magazine31to the driving position a, a guiding portion36which has a conveyance path for guiding the roll nail RN pulled out of the nail-accommodating magazine31to the driving position a, and a sandwiching portion37which sandwiches the roll nail RN sent out from the conveyance path of the guiding portion36in front of the driving position a, and as shown inFIG.2, the guiding portion36is disposed so that the roll nail RN accommodated in the nail-accommodating magazine31in the wound state is pulled out in a tangent direction of the winding part.

The nail sending-out means32includes a linear electromagnetic actuator33having a mover33awhich reciprocates in a sending-out direction of the roll nail RN, a swing member34supported by the mover33aof the linear electromagnetic actuator33, capable of swing so that a distal end side approaches to/separates from the roll nail RN, a spring, not shown, which biases the distal end side of the swing member34to the roll nail RN side, and a lock claw35which is mounted on the distal end of the swing member34and locks the nail N of the roll nail RN, and it is configured such that, by means of an extending operation of the mover33aof the linear electromagnetic actuator33, the nail N of the roll nail RN in a state of being locked by the lock claw35is pushed out to the driving position a side, whereby the roll nail RN is moved to the nail driving position a side.

The lock claw35has, as shown inFIG.8, a locking surface which locks the nail N and a guide surface inclined while being curved to an opposite side (counter-sending out direction side of the roll nail NR) from an upper end of this locking surface, and as shown inFIG.9(a), by means of the extending operation of the mover33aof the linear electromagnetic actuator33, a second nail N from the distal end, which is locked by the locking surface, is pushed out to the driving position a side, whereby the nail N at the distal end is moved to the driving position a. After that, by means of a withdrawing operation of the mover33aof the linear electromagnetic actuator33, the lock claw35retreats to the counter-sending out direction of the roll nail RN, but at that time, as shown inFIG.9(b), while the distal end side of the swing member34is being separated from the roll nail RN against the biasing force of the spring which is biasing to the roll nail RN side so that the third nail N from the distal end follows a guiding surface of the lock claw35, the lock claw35rides over the third nail N from the distal end, and as shown inFIG.9(c), the nail N is locked by the locking surface of the lock claw35. Then, after the nail N located at the driving position a is driven, the nail N at the distal end is sequentially supplied to the driving position a by repeating the similar nail supply operation.

The sandwiching portion37includes a base plate38on which the roll nail RN is caused to follow, a sandwiching piece39which sandwiches the roll nail RN caused to follow this base plate38between it and the base plate38and is supported capable of swing so that a distal side approaches to/separates from the roll nail RN, and a spring40which biases the distal end side of the sandwiching piece39to the roll nail RN side, and it is configured such that the distal end of the sandwiching piece39sandwiches the roll nail RN in the vicinity on the counter-sending out side of a moving range of the lock claw35.

The base plate38has, as shown inFIG.6andFIG.8, an arc portion38awhose distal end side is curved in a semi-arc shape so as to surround the nail driving position a and a window38binto which the lock claw35can enter is formed so that the lock claw35advances/retreats in the window38bof the base plate38by advancing/retreating of the mover33aof the linear electromagnetic actuator33.

The driving-force adjustment unit41includes, as shown inFIG.7, a valve43which is connected to the communication hole CH formed in the cylinder cap12bthrough an air channel42and whose opening degree can be adjusted by a manual operation, and by adjusting the opening degree of the valve43, the push-out resistance of the air in the cylinder12pushed out by the piston13can be adjusted. Therefore, by adjusting the push-out resistance of the air in the cylinder12by adjusting the opening degree of the valve43, the driving force of the driving rod14can be adjusted in accordance with the length or the thickness or the like of the nail N, and a plurality of types of nails can be handled.

Moreover, though detailed explanation is omitted, a safety device which prevents unintended driving of the nail N is mounted in this nailing machine1, and unless a driving-out port for the nail N provided in the nail supply portion3is pressed onto a driving surface for the nail N of a wall surface or the like, the brushless motor17or the linear electromagnetic actuator33is not operated even if the trigger switch23is pulled, the driving rod14which has advanced to the driving position a by means of the previous driving operation does not retreat to the counter-driving direction from the driving position a, and the nail N is not supplied to the driving position a.

In the nailing machine1configured as above, as shown inFIG.6(a), when the trigger switch23is pulled in a state where the driving-out port for the nail N provided in the nail supply portion3is pressed onto the driving surface DS for the nail N on the wall surface or the like so as to cancel the operation of the safety device, the brushless motor17is operated, the sector gear21is rotated in the counterclockwise direction and is meshed with the rack gear22mounted on the piston rod13b, and as shown inFIG.6(b), the piston13is withdrawn in the counter-driving direction, while the driving spring15is compressed and thus, the driving rod14located at the driving position a is also retreated from the driving position a to the counter-driving direction, and the nail N is supplied by the nail sending-out means32to the driving position a.

When the piston13is withdrawn to a predetermined position in the counter-driving direction, the meshing between the sector gear21and the rack gear22is disengaged and thus, as shown inFIG.6(c), the piston13is driven out to the driving direction by the biasing force of the driving spring15, which has been accumulated by being compressed, and with that, the nail N supplied to the driving position a is driven into the driving surface DS by the driving rod14.

As described above, since this nailing machine1can drive one piece of the nail N while the sector gear21makes one rotation, unlike the conventional nailing machine which cannot drive a nail during a period until the flywheel rotates at a constant speed from the time when the worker pulled the trigger switch, the nails N can be continuously driven.

Moreover, since this nailing machine1has the cylinder cap12bformed of an elastic member, an impact when the piston head13acollides against the cylinder cap12bcan be absorbed, components are hardly broken, and driving operability for the nails N is favorable.

Furthermore, since the nail supply unit30of this nailing machine1is so configured that the roll nail RN is sent out in the tangent direction of the winding part of the roll nail RN accommodated in the nail-accommodating magazine31and is supplied to the driving position a, the sending-out resistance of the roll nail RN is small, and the nail N can be supplied to the driving position a smoothly and reliably with a small force.

INDUSTRIAL APPLICABILITY

The present invention can be applied to electric nailing machines.

REFERENCE SIGNS LIST