Abstract: When the plunger is a game moved to a prescribed position Ph of an initial state on the upper dead point side by the drive force of the motor after the plunger is moved to the lower dead point side, the controller of a spring driven-type fastener driving tool reduces the rotational speed of the motor to a prescribed value or less based on the detection signal of the operation detection switch and then stops the slowed down motor. In order to achieve this, the plunger is stopped at a stop position of an initial state that is as close as possible to an upper dead point side drive start position and is subjected to a strong compression force by the drive spring.

Abstract: According to an aspect of the invention, there is provided a power tool including: a commutator motor including a rotor and a stator having a substantially cylindrical stator core; a fan provided to face one axial end of the stator core so as to be rotatable coaxially with the rotor; and a stator coil bundle fixed to an inner peripheral surface of the stator core, the stator coil bundle having a coil end portion that protrudes more than the stator core in a rotational axis direction of the rotor, wherein a minimum internal diameter of the coil end portion is smaller than a maximum external diameter of the fan, and wherein the coil end portion has a fan facing portion that faces the fan along a direction perpendicular to the rotational axis direction.

Abstract: A portable electric cutting device includes housing, a saw blade, a saw cover, a base linked to the housing, and a centrifugal fan. The saw cover has a partition wall formed with a plurality of division walls including front and rear divisional walls. The plurality of division walls have an inclined part that extends at an angle with respect to a radial direction of the rotary axis of the fan such that a radially outer part of the inclined part locates upstream from a radially inner part of the inclined part with respect to the rotary direction of the fan.

Abstract: According to an aspect of the present invention, there is provided a driving device including: a driver bit for striking a fastener loaded in a launching section; a driver for driving the fastener from the launching section by reciprocating the driver bit; triggering means pullable to control the driver; and locking means that locks the pulling operation of the triggering means when being set to a lock position and that releases the locking state when being set to a release position, wherein the locking means includes release means to operate the locking means toward the release position when the triggering means is pulled and returning means to return the locking means toward the lock position when the pulling is released.

Abstract: An electric fastener driver having a compact size and simple construction. A driver segment provided with a rack is movably disposed in a housing. A flywheel is driven by a motor. A drive shaft is concentric with and integral with the flywheel. A coil spring is fixed to the drive shaft. A driven rotor is coaxial with the drive shaft and has one end portion serving as a spring seat portion positioned within the coil spring. A pinion is disposed at the driven rotor and is meshedly engaged with the rack. An urging section is disposed within the driven rotor. A ball is movably disposed in a through-hole formed in the driven rotor for urging an end portion of the coil spring by the urging section. A solenoid controls a protruding amount of the ball from the surface of the driven rotor.

Abstract: According to an aspect of the present invention, there is provided a nailing machine including: a housing; a motor that is accommodated in the housing; a plunger that plunges a nailing member; and a spring that is expanded or compressed by the motor to store an elastic energy therein and that accelerates the plunger by releasing the elastic energy, wherein a spring constant of the spring at one end of the spring in an expanding/compressing direction is set smaller than that of the spring at a center in the expanding/compressing direction.

Abstract: A fastener driving tool includes a housing, a motor, a plunger, a spring, a power transmission mechanism, and an impact buffering portion. The motor is provided in the housing. The plunger is provided in the housing and impacts a fastener in one direction. The spring urges the plunger in the one direction. The power transmission mechanism connects the motor and the plunger for moving the plunger in another direction opposite to the one direction against an urging force of the spring. The impact buffering portion is provided in one of the power transmission mechanism and the plunger.

Abstract: A stationary annular abutting member 14E is provided with a first projecting section that operates as part of a ratchet mechanism. A rotational flange section is provided with a second projecting section that operates as part of the ratchet mechanism. The first projecting section projects in the direction from the ON position toward the OFF position of a plunger of a solenoid. The second projecting section projects in the direction from the OFF position toward the ON position of the plunger. When a driven rotor starts rotating and comes to a rotary position slightly short of the rotary position of about ¾ of a full turn in the ON state of the solenoid, the projecting end of the first projecting section and that of the second projecting section are located opposite to each other and the second projecting section rides on the first projecting section.

Abstract: A drive machine includes a housing; a motor disposed in the housing; a magazine which is attached to the housing and supplies a nail to a drive position; a plunger for driving the nail; a spring which impels and accelerates the plunger to the drive position by elastic force; and a chain which is driven by the motor, to thus accumulate elastic energy in the spring. The chain has a projection which provides a first state where elastic energy is accumulated in the spring and a second state where the accumulated elastic energy is released.

Abstract: A portable electric cutting apparatus includes a housing for housing an electric motor rotating a saw blade a saw cover attached to the housing, the saw cover having a shape to cover an upper half of an outer periphery, the saw cover including a saw blade housing portion at least partially housing the saw blade and a cylindrical portion having a substantially cylindrical shape, the cylindrical portion connecting to the housing at an end face of the cylindrical portion a base being joined to at least one of the saw cover and the housing, the base having an opening to allow the saw blade to project downwardly from a bottom face which is slidable on a cut material and a fan being driven by the electric motor, wherein a discharge passage forming member is provided with the saw cover so as to form a discharge passage by cooperating with a wall face of the saw cover.

Abstract: A portable electric cutting apparatus includes a housing for housing an electric motor for rotating a saw blade a fan provided in the housing and driven by the electric motor, a saw cover attached to the housing and having a saw blade housing part having a shape to cover an upper half of the outer periphery of the saw blade for housing a part of the saw blade, a base formed with an opening for allowing the saw blade to project downward from a bottom face which is slidable on a cut material. A discharge passage for discharging a fan wind produced by driving the fan is formed along an outer periphery of the saw cover. The fan wind is discharged through the discharge passage toward a front side of the base in the cutting direction.

Abstract: A portable electric cutting device includes housing, a saw blade, a saw cover, a base linked to the housing, and a centrifugal fan. The saw cover has a partition wall formed with a plurality of division walls including front and rear divisional walls. The plurality of division walls has an inclined part that extends at an angle with respect to a radial direction of the rotary axis of the fan such that a radially outer part of the inclined part locates upstream from a radially inner part of the inclined part with respect to the rotary direction of the fan.

Abstract: In a portable driver (portable driver) comprising: a driver plate 18B for driving a nail (fastener); a plunger 18 formed integrally to or separately from the driver plate 18B; a rack 18A formed on the plunger 18; a pinion to be tooth-engaged with the rack 18A; and a driving means for rotatively driving the pinion, in which the fastener is driven by linearly moving the plunger 18 and the driver plate 18B owing to rotation of the pinion, a tooth width of the rack 18A is changed in a longitudinal direction thereof. For example, the tooth width L1 in an area A of the rack with which the pinion is tooth-engaged when driving is started or being carried out is set to be narrower than the tooth width L2 in an area B of the rack with which the pinion is tooth-engaged when the driving is completed, i.e. L1<L2.

Abstract: In a portable driver 1 (portable driver) comprising: a driver plate 18B for driving a nail (fastener) 6; a plunger 18 formed integrally to or separately from the driver plate 18B; a moving unit for linearly moving the plunger 18 in a direction of driving the nail 6; a guiding unit for guiding the linear movement of the plunger by the moving unit, the guiding unit is formed of a linear rail 21 covering a part of the plunger 18. Further, the rail 21 is formed of a hollow member and a slit along the moving direction of the plunger 18 is formed at a part thereof.

Abstract: Fanned air generated by a fan to cool a motor is discharged from a housing through fanned air discharge ports toward an opening formed in a base. The fanned air discharged toward the opening is then introduced into a groove in fluid communication with the opening. The groove is formed in a bottom surface of the base and has an open side at a front side of the base. The fanned air is then discharged from the front side of the base, blowing off saw dust on a cutting object so as to prevent dust from accumulating on a marking line on the cutting object.

Abstract: A stationary annular abutting member 14E is provided with a first projecting section that operates as part of a ratchet mechanism. A rotational flange section is provided with a second projecting section that operates as part of the ratchet mechanism. The first projecting section projects in the direction from the ON position toward the OFF position of a plunger of a solenoid. The second projecting section projects in the direction from the OFF position toward the ON position of the plunger. When a driven rotor starts rotating and comes to a rotary position slightly short of the rotary position of about ¾ of a full turn in the ON state of the solenoid, the projecting end of the first projecting section and that of the second projecting section are located opposite to each other and the second projecting section rides on the first projecting section.

Abstract: Fanned air generated by a fan to cool a motor is discharged from a housing through fanned air discharge ports toward an opening formed in a base. The fanned air discharged toward the opening is then introduced into a groove in fluid communication with the opening. The groove is formed in a bottom surface of the base and has an open side at a front side of the base. The fanned air is then discharged from the front side of the base, blowing off saw dust on a cutting object so as to prevent dust from accumulating on a marking line on the cutting object.

Abstract: An electric motor designed for electric tools. The motor includes a stator core having a first stator core and a second stator core. The motor includes a first molded coil having a first coil covered entirely with a thermosetting resin that is electrically insulating and highly heat conductive. The motor also includes a second molded coil having a second coil covered entirely with the thermosetting resin. The first coil and the first stator core are integrally firmly fixed together by the thermosetting resin which is injected in a metal mold to cover the entire first coil after the first stator core and the first coil mounted on the first coil mounting portion are fixed to the metal mold. Similarly, the second coil and the second stator core are integrally firmly fixed together by the thermosetting resin.

Abstract: An electric motor designed for electric tools. The motor includes a first molded coil having a first coil covered entirely with a resin that is electrically insulating and highly heat conductive. The motor also includes a second molded coil having a second coil covered entirely with the resin. The first molded coil has a pair of first axial portions, and the second molded coil has a pair of second axial portions in alignment with the first axial portions. A stator core disposed around the molded coils includes a first stator core and a second stator core with first stator core legs and second stator core legs, respectively. Air paths through which fan airflow passes are formed between the axial portions and the opposing stator core legs.

Abstract: Fanned air generated by a fan to cool a motor is discharged from a housing through fanned air discharge ports toward an opening formed in a base. The fanned air discharged toward the opening is then introduced into a groove in fluid communication with the opening. The groove is formed in a bottom surface of the base and has an open side at a front side of the base. The fanned air is then discharged from the front side of the base, blowing off saw dust on a cutting object so as to prevent dust from accumulating on a marking line on the cutting object.