JP5428585B2 - Driving machine - Google Patents

Description

  The present invention relates to a driving machine, and more particularly to an electric driving machine.

  2. Description of the Related Art Conventionally, a driving machine that accumulates energy inside a housing by rotation of a motor and drives a plunger by the accumulated energy to drive a nail is known. As means for accumulating the driving force of the motor as energy, for example, a coil spring is used.

  More specifically, the plunger is provided with a pin locking portion, and a power transmission mechanism composed of a plurality of gears for transmitting the rotational force of the motor to the plunger is provided between the motor and the plunger. . In the vicinity of one peripheral surface of the gear constituting the power transmission mechanism, a pin protrudes. The motor is driven to rotate the gear, the pin is engaged with the pin locking portion, and the plunger is moved. As a result, the coil spring provided at one end of the plunger is compressed, and energy is stored in the coil spring. Then, when the engagement between the pin and the pin locking portion is released and the plunger is released, the plunger moves at a high speed in the direction in which the coil is urged, and a nail or the like is provided by a blade provided so as to be movable integrally with the plunger. Strike the fasteners into the workpiece. The plunger is configured to collide with a bumper provided in the housing after the blade hits the stopper.

  The driving machine is required to be capable of adjusting the depth at which the stopper is driven into the driven material, that is, the driving depth. This is because, when the material of the material to be driven is different, hitting the stopper with a certain striking strength and driving it in may cause the stopper to not be driven completely or to be driven too deeply. . Therefore, the driving machine is provided with a configuration that enables adjustment of the driving depth.

  Japanese Patent Laid-Open No. 4-122581 (Patent Document 1) describes a driving machine capable of moving a bumper in a driving direction of a stopper or an opposite driving direction which is the opposite direction. In the housing, the bumper is supported by a bumper holder, and the bumper holder can be moved integrally with the bumper in the driving direction or the counter driving direction of the stopper. A gear is screwed into a part of the bumper holder. An adjuster having a substantially columnar shape is disposed in the housing so that its axis is parallel to the driving direction and is rotatable about the axis. A gear is screwed into a part of the adjuster. A part of the peripheral surface of the adjuster is exposed to the outside of the housing through a through hole formed in the housing.

  The gear of the bumper holder and the gear of the adjuster are screwed together. The bumper and bumper holder are moved by moving the bumper holder in the driving direction of the stopper by rotating the adjuster by pressing the belly of the finger against the adjuster exposed to the outside of the housing. It is comprised so that it can be made to move to the driving | running direction of a stopper, or a counter driving | operation direction. By moving the bumper in the counter driving direction, the plunger quickly collides with the bumper at the time of driving, and the driving depth can be reduced. By moving the bumper in the driving direction, the plunger slowly collides with the bumper at the time of driving, and the driving depth can be reduced.

  An anti-rotation mechanism is provided to prevent the adjuster from rotating naturally when the user does not rotate the adjuster. Specifically, a circular concave portion is formed on the end surface of the adjuster in the axial direction, and a head portion of a spring-biased pin can contact the concave portion. With this configuration, it is possible to generate a so-called click feeling that the adjuster rotates discontinuously, and it is possible to prevent the adjuster from rotating naturally.

Japanese Patent Laid-Open No. 4-122581

  However, in the driving machine described in the above publication, a bumper is disposed on one end side of the adjuster in the axial direction. In the rotation prevention mechanism of the driving machine, the head of the pin is in contact with the axial end surface of the adjuster. Since the impact when the plunger collides with the bumper is transmitted in the axial direction of the adjuster, there arises a problem that the pin is damaged by the axial end surface of the adjuster.

  Therefore, an object of the present invention is to provide a driving machine having a rotation preventing mechanism that is not damaged by an impact of a plunger colliding with a bumper.

To achieve the above object, the present invention provides a housing, a motor provided in the housing, a blade disposed in the housing for striking and driving a stopper, and a blade disposed in the housing. A plunger that integrally moves in the driving direction and the counter driving direction of the stopper, a spring that biases the plunger in the driving direction, and a spring that moves the plunger in the counter driving direction to move the spring in the counter driving direction. A power transmission mechanism that connects the motor and the plunger for compressing in the driving direction; and the plunger is movable in the driving direction and the counter driving direction, and when the stopper is driven by the blade, a bumper collision, is no axis of substantially cylindrical shape so as not to move in the direction of the shaft center with respect Rutotomoni said housing is rotatably supported in the housing about an axis disposed parallel to the ball striking write direction and supported by, the peripheral surface And leveling exposed to the outside of the housing part of the peripheral surface has a recess or protrusion, the biasing portion protrusion or urging portion recesses has the urging unit protrusions or urging portion recess the the biasing and urging portion protrusion or urging portion recess so as to constantly contact with the peripheral surface of the adjuster have a biasing portion that can engage the recess or protrusion of the adjuster, the The bumper is provided on one end side in the axial direction of the adjuster, and provides a driving machine that moves in the driving direction or the counter driving direction by rotating the adjuster .

  It has a substantially cylindrical shape and its shaft center is arranged parallel to the driving direction and is supported by the housing so that it can rotate around the shaft center. It has a concave or convex portion on its peripheral surface, and part of the peripheral surface is exposed to the outside of the housing. The bumper can move the bumper in the driving direction or the counter driving direction by rotating the adjuster, and has a biasing portion convex portion or a biasing portion concave portion. The plunger has a biasing portion that biases the biasing portion concave portion so as to always contact the peripheral surface of the adjuster and allows the biasing portion convex portion or the biasing portion concave portion to be engaged with the concave portion or convex portion of the adjuster. When an impact that collides with the bumper is transmitted to the adjuster, the direction in which the impact is transmitted is directed to the axial direction of the adjuster. For this reason, a strong impact does not act on the urging portion, and the urging portion can be prevented from being damaged by the impact.

  In addition, since a part of the peripheral surface of the adjuster is exposed to the outside of the housing, the adjuster can be easily operated by locking the concave or convex portion of the peripheral surface of the adjuster to the abdomen of the finger. Can be rotated. In addition, the urging portion convex portion or the urging portion concave portion engages with the concave portion or the convex portion on the peripheral surface of the adjuster to generate a so-called click feeling that the adjuster rotates discontinuously when the user rotates the adjuster. Can be made. In addition, it is possible to exhibit a function of preventing looseness that prevents the adjuster from rotating naturally when the user is not rotating the adjuster.

  Here, it is preferable that the urging portion is composed of a leaf spring supported by the housing. Since the urging portion is made of a leaf spring supported by the housing, the urging portion can be configured simply.

  Moreover, it is preferable that a part of this leaf | plate spring bends this urging | biasing part convex part. Since the urging portion convex portion is formed by bending a part of the leaf spring, the urging portion convex portion can be configured simply.

  Further, it is preferable that the concave portion is formed with a plurality of grooves extending in parallel to the axial direction of the adjuster on the peripheral surface. Since the concave portion is formed with a plurality of grooves extending in parallel with the adjuster in the axial direction on the peripheral surface, the concave surface of the user's finger can be prevented from slipping when the adjuster is rotated.

Moreover, the bumper is supported by the bumper holder having a support portion shaft portion extending in parallel to the nailing direction, the adjuster will annularly mounted the support part shank forms a hollow substantially cylindrical, the inner periphery of the adjuster It is preferable that the adjuster and the bumper holder are connected by screwing the surface and the outer peripheral surface of the support portion shaft portion.

  The bumper is provided on one end side of the adjuster in the axial direction and is supported by a bumper holder having a support portion shaft portion extending in parallel to the driving direction, and the adjuster has a substantially hollow cylindrical shape, and the support portion shaft portion is mounted. Since the adjuster and the bumper holder are connected by screwing the inner peripheral surface of the adjuster and the outer peripheral surface of the support portion shaft portion, the outer diameter of the adjuster can be increased. For this reason, the user of the driving machine can rotate the adjuster with a relatively weak force.

  As described above, the present invention can provide a driving machine having a rotation prevention mechanism that is not damaged by the impact of the plunger colliding with the bumper.

The fragmentary sectional view which shows the driving machine by embodiment of this invention. The principal part sectional drawing which shows the driving machine by embodiment of this invention. The principal part sectional drawing which shows the driving machine by embodiment of this invention.

  Hereinafter, a driving machine according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. Specifically, the driving machine is an electric nail driving machine 1, and a nail 1A as a stopper can be driven into a not-shown material to be driven such as wood or gypsum board. The nailing machine 1 includes a housing 2, a drive unit 3, a driving unit 6, a nose unit 7, and a magazine 8. A vertical direction in FIG. 1 as a direction in which a plunger 63 described later moves is defined as a vertical direction, and in particular, a direction in which the plunger 63 is urged by a spring 62 described below to strike the nail 1A is defined as a downward direction (driving direction). The direction opposite to the driving direction is defined as the upward direction (counter driving direction).

  The housing 2 is made of a resin such as nylon or polycarbonate, and includes a drive unit 3 and the like inside. The upper part of the housing 2 has a handle 21, and the handle 21 is provided with a trigger 21 </ b> A for controlling the drive unit 3. The handle 21 is provided with a detachable battery 22, and a power supply unit (not shown) that supplies power supplied from the battery 22 to the drive unit 3 is provided inside the handle 21.

  Further, a through hole 2a (FIG. 3) that connects the inside and the outside of the housing 2 is formed in a part of the housing 2 and in the vicinity of the nose portion 7 described later. A leaf spring 2 </ b> A is fixed to the housing 2 in the vicinity of the through hole 2 a and inside the housing 2. The leaf spring 2A corresponds to an urging portion. The surface of the leaf spring 2A is oriented parallel to the vertical direction, and a leaf spring convex portion 2B is formed at a substantially central position in the longitudinal direction of the leaf spring 2A so that the leaf spring 2A is bent and protrudes in a mountain shape. . The leaf spring convex portion 2B corresponds to the biasing portion convex portion. The leaf spring protrusion 2B extends in the vertical direction along the surface of the leaf spring 2A. The leaf spring 2A is configured by using a material having high hardness that is difficult to be worn when rubbed against a peripheral surface of an adjuster 66, which will be described later, for example, stainless steel for springs having a high hardness specification.

  The drive unit 3 includes a motor 30 and a power transmission mechanism 31. The motor 30 includes a shaft portion 31A serving as an output shaft. The motor 30 is provided inside the housing 2 and disposed below the handle 21, and the shaft portion 31 </ b> A is oriented in a direction perpendicular to the vertical direction.

  The power transmission mechanism 31 includes a planetary gear mechanism 32 and a plunger drive gear 33 that meshes with the planetary gear mechanism 32. The planetary gear mechanism 32 is a known gear mechanism that is provided at an end position of the shaft portion 31A and includes a sun gear, a revolution gear, an output shaft 32A, and the like. The output shaft 32A of the planetary gear mechanism 32 is arranged coaxially with the shaft portion 31A. The output shaft 32A of the planetary gear mechanism 32 includes a pinion 32B that rotates integrally with the output shaft 32A and a one-way clutch. The one-way clutch allows the output shaft 32A to rotate in the direction in which the output shaft 32A rotates by the rotational force from the motor 30, and when the output shaft 32A attempts to rotate in the opposite direction, the output shaft 32A does not rotate. To regulate.

  The plunger drive gear 33 meshes with the pinion 32B of the output shaft 32A, and is configured to rotate when the motor 30 is driven to rotate the output shaft 32A of the planetary gear mechanism 32. A pin 33 </ b> A is provided on the side surface of the plunger drive gear 33. The pin 33 </ b> A is configured to rotate about the rotation axis of the plunger drive gear 33 as the plunger drive gear 33 rotates.

  The driving portion 6 has a coil spring 62 and a plunger 63 as shown in FIG. The coil spring 62 is made of a steel wire. The upper end of the coil spring 62 is in contact with the inner surface of the housing 2 above the plunger 63. A blade 63B is connected to the plunger 63, and the plunger 63 and the blade 63B are configured to be movable in the driving direction (downward direction) or in the counter driving direction (upward direction). The plunger 63 is in contact with the lower end of the coil spring 62.

  The plunger 63 is provided with an engaging portion 63A that can engage with the pin 33A of the plunger driving gear 33. The plunger drive gear 33 rotates, the pin 33A engages with the engaging portion 63A, and the plunger 63 is pushed upward together with the blade 63B against the urging force of the coil spring 63. When the top dead center is reached, the pin 33A is engaged. The engagement with the joint 63A is configured to be released.

  The blade 63 </ b> B is formed in an elongated plate shape, and is provided to extend downward from the peripheral edge of the plunger 63. As shown in FIG. 1 in the initial state, the blade 63 </ b> B penetrates the injection port 72 a of the nose portion 7, and its tip protrudes from the lowermost end of the nose portion 7. A bumper 64 made of a soft rubber or resin such as urethane is provided below the plunger 63 in the housing 2.

  The bumper 64 has an annular shape, and its axial direction is directed vertically. The plunger 63 collides with the bumper 64 when the blade 63B hits the nail 1A. The bumper 64 is accommodated and held in a bumper holder 65. The bumper holder 65 has a substantially cylindrical shape, and one end in the axial direction opens on the entire surface, and the other end opens at the axial center position. The bumper holder 65 and the bumper 64 have a coaxial positional relationship, and the bumper 64 is accommodated in the bumper holder 65.

  An opening on the other end side in the axial direction of the bumper holder 65 is provided with a substantially cylindrical holder screw portion 65A extending downward. The holder screw portion 65A corresponds to the support portion shaft portion. The outer peripheral surface of the holder screw portion 65A is threaded. An adjuster 66 is provided around the holder screw portion 65A. The adjuster 66 has a substantially cylindrical shape, is supported on the housing 2 so as to be rotatable about its axis, and is arranged in a coaxial positional relationship with the holder screw portion 65A. The adjuster 66 cannot move in the axial direction. The inner peripheral surface of the adjuster 66 is screwed and is screwed into the outer peripheral surface of the screwed holder screw portion 65A. Accordingly, when the adjuster 66 rotates, the holder screw portion 65A can move integrally with the bumper 64 in the upward direction or the downward direction. The movable amount of the bumper 64 and the bumper holder 65 in the vertical direction is about 2 mm.

  A part of the outer peripheral surface of the adjuster 66 is exposed to the outside of the housing 2 through the through hole 2 a of the housing 2. On the outer peripheral surface of the adjuster 66, a plurality of grooves 66a extending in parallel to the axial direction of the adjuster 66 are formed over the entire outer peripheral surface. The groove 66a corresponds to a recess. The leaf spring convex portion 2B is always in contact with the outer peripheral surface of the adjuster 66 by the urging force of the leaf spring 2A itself, and the leaf spring convex portion 2B can be engaged with the groove 66a. Further, the outer peripheral surface of the adjuster 66 is plated with a material that does not easily wear when rubbed against the leaf spring convex portion 2A over the entire circumference, for example, nickel plating. Nickel plating has high hardness and is excellent in wear resistance and slidability.

  The nose portion 7 is disposed below the driving portion 6. An injection port 72a through which the blade 63B can be inserted is formed in the nose portion 7, and an insertion port 72b through which a push lever 73 described later can be inserted is formed. The magazine 8 contains a plurality of nails 1A. The nail 1A is supplied to the nose portion 7 by the magazine 8 and can be hit by the blade 63B.

  Further, a push lever 73 disposed in parallel with the blade 63B is provided in the nose portion 7. One end of the push lever 73 protrudes from the insertion opening 72 b to the outside of the nose portion 7, and the other end is connected to a switch 74 provided in the housing 2 and above the plunger 63. When the nail 1A is driven into the workpiece, the push lever 73 comes into contact with the workpiece and is pushed upward to turn on the switch 74 and when the trigger 21 is pulled by the user, the battery 22 Is configured to supply power to the motor 30.

  When the nail 1A is driven into a workpiece to be driven (not shown) in the nail driver 1 having the above configuration, first, the driving depth is adjusted according to the material of the workpiece. The adjustment of the driving depth is performed by rotating the adjuster 66 while the user of the nail driver 1 presses against the part of the peripheral surface of the adjuster 66 exposed to the outside of the housing 2. Do. In order to increase the driving depth, the adjuster 66 is rotated to move the bumper 64 in the driving direction. In order to reduce the driving depth, the adjuster 66 is rotated to move the bumper 64 in the counter driving direction.

  At this time, since a part of the peripheral surface of the adjuster 66 is exposed to the outside of the housing 2, the user of the nail driver 1 locks the peripheral surface of the adjuster 66 in which the groove 66a is formed to the abdomen of the finger. As a result, the adjuster 66 can be easily rotated. Further, the leaf spring convex portion 2B is engaged with the groove 66a formed on the peripheral surface of the adjuster 66, thereby generating a so-called click feeling that the adjuster 66 rotates discontinuously when the user rotates the adjuster 66. be able to.

  The bumper 64 is provided above the adjuster 66 and is supported by a bumper holder 65 having a holder screw portion 65A extending in parallel to the driving direction. The adjuster 66 is formed into a hollow, substantially cylindrical shape, and the holder screw portion 65A is installed around the adjuster 66. Since the adjuster 66 and the bumper holder 65 are connected by screwing the inner peripheral surface of 66 and the outer peripheral surface of the holder screw portion 65A, the outer diameter of the adjuster 66 can be increased. For this reason, the user of the nail driver 1 can rotate the adjuster 66 with a relatively weak force. More specifically, the adjuster 66 can be rotated with a force of about 700 g at the maximum in the tangential direction of the peripheral surface of the adjuster 66.

  Next, the driving position is determined by bringing the tip of the blade 63B protruding from the tip of the nose portion 7 along the driving position on the surface of the target material (not shown). Since the blade 63B is positioned on the trajectory through which the nail 1A passes, the position for driving the nail 1A is accurately and easily defined by performing the driving position alignment with the blade 63B protruding from the tip of the nose portion 7. can do.

  In this state, the operator pulls the trigger 21A to supply power to the motor 30, and rotates the shaft portion 31A. The rotation of the shaft portion 31A is decelerated by the planetary gear mechanism 32 and rotates the output shaft 32A. As a result, the plunger drive gear 33 rotates, the pin 33A engages with the engaging portion 63A, and the plunger 63 is pushed upward together with the blade 63B against the urging force of the coil spring 63. The engagement between 33A and the engaging portion 63A is released. Then, the plunger 63 and the blade 63B are integrally moved at a high speed downward by the urging force of the coil spring 63, and the blade 63B strikes a nail 1A supplied from a magazine 8 described later to the nail 1A to the workpiece. Type.

  When the impact that the plunger 63 collides with the bumper 64 during driving is transmitted to the adjuster 66, the impact is transmitted in the axial direction of the adjuster 66, so that the impact is in contact with the peripheral surface of the adjuster 66. A strong impact does not act on the leaf spring 2A having the leaf spring protrusion 2B. For this reason, it is possible to prevent the leaf spring 2A from being damaged by an impact. Further, since the groove 66a is formed on the peripheral surface of the adjuster 66, and the leaf spring convex portion 2B is engaged with the groove 66a, the adjuster 66 is not rotated when the user does not rotate the adjuster 66 when driving or the like. It can exhibit a function of preventing loosening that prevents it from rotating naturally.

  Further, since the urging portion is composed of the leaf spring 2A supported by the housing 2, the urging portion can be configured simply. Further, since the urging portion convex portion is composed of a leaf spring convex portion 2B formed by bending a part of the leaf spring 2A, the urging portion convex portion can be configured simply. In addition, since the concave portion is formed with a plurality of grooves 66a extending in parallel to the axial direction of the adjuster 66 on the peripheral surface, the peripheral surface of the user's finger can be made difficult to slip when the adjuster 66 is rotated.

  The driving machine of the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made within the scope described in the claims. For example, in the present embodiment, the urging portion is configured by the leaf spring 2A, but is not limited to the leaf spring 2A. Moreover, although the urging | biasing part convex part was comprised by the leaf | plate spring convex part 2B which bent the leaf | plate spring 2A and protruded in a mountain shape, it is not limited to this structure. Moreover, although the several groove | channel 66a was formed in the surrounding surface of the adjuster 66, and the recessed part was made, the recessed part is not limited to the groove | channel 66a.

  Further, a groove 66a that is a concave portion is formed on the peripheral surface of the adjuster 66, and the urging portion has a leaf spring convex portion 2B that is a urging portion convex portion. The urging portion may be provided with a urging portion recess. As a convex part of the peripheral surface of an adjuster, you may comprise by providing a steel ball in a peripheral surface, for example.

  In the present embodiment, the driving machine is a nail driving machine, but is not limited to a nail driving machine, and may be a driving machine for driving a screw or the like.

  The driving machine of the present invention is particularly useful in the field of driving machines that require a more accurate driving depth.

DESCRIPTION OF SYMBOLS 1 ... Nail driver Stopper ... 1A 2 ... Housing 2A ... Leaf spring 2B ... Leaf spring convex part 30 ... Motor 31 ... Power transmission mechanism 62 ... Coil spring 63 ... Plunger 63B ... Blade 64 ... Bumper 65 ... Bumper holder 65A ... Holder screw part 66 ... Adjuster 66a ... Groove

Claims (5)

A housing;
A motor provided in the housing;
A blade disposed within the housing for striking and driving a stop;
A plunger disposed within the housing and moving integrally with the blade in a driving direction and a counter driving direction of the stopper;
A spring for urging the plunger in the driving direction;
A power transmission mechanism connecting the motor and the plunger for moving the plunger in the counter driving direction and compressing the spring in the counter driving direction;
A bumper that is movable in the driving direction and the counter driving direction and that the plunger collides with when the stopper is driven by the blade;
Substantially cylindrical forms an axis is immovably supported in the direction of the shaft center with respect Rutotomoni said housing is rotatably supported in the housing about an axis disposed parallel to the ball striking write direction, the peripheral surface An adjuster having a concave portion or a convex portion and a part of the peripheral surface exposed outside the housing;
The urging portion convex portion or the urging portion concave portion has an urging portion convex portion or the urging portion concave portion, and the urging portion convex portion or the urging portion concave portion is urged so as to always contact the peripheral surface of the adjuster. the part recesses have a, a biasing portion which can engage the recess or protrusion of the adjuster,
The bumper is provided on one end side of the adjuster in the axial direction, and moves in the driving direction or the counter driving direction by rotating the adjuster .   2. The driving machine according to claim 1, wherein the urging portion includes a leaf spring supported by the housing.   3. The driving machine according to claim 2, wherein the urging portion convex portion is formed by bending a part of the leaf spring.   4. The driving machine according to claim 1, wherein the concave portion is formed with a plurality of grooves extending in parallel with an axial direction of the adjuster on the peripheral surface. 5. The bumper is supported by the bumper holder having a support portion shaft portion extending in parallel to the fastener driving direction,
The adjuster has a hollow, substantially cylindrical shape, and the support portion shaft portion is mounted,
5. The adjuster and the bumper holder are connected to each other by screwing an inner peripheral surface of the adjuster and an outer peripheral surface of the support portion shaft portion. Machine.

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