Abstract: A fastener driving apparatus includes a power source, a control circuit, a motor, a first cylinder, a first piston, a linear motion converter, a second cylinder, a second piston, an anvil, a valve arrangement and at least one sensor. During a compression stroke, the first piston is configured to compress gas in a first cylinder to a predetermined pressure. At the predetermined pressure, the valve arrangement assumes an open position for communicating the compressed gas to the second cylinder, thereby causing the second piston to move linearly and enabling the anvil to drive the fastener into the workpiece. During a return stroke, at a predetermined position of the first piston in the first cylinder, the valve arrangement assumes the open position for communicating a vacuum created in the first cylinder to the second cylinder and thereby causing the second piston and the anvil to retract to their initial positions.

Abstract: A device for impacting a fastener in one embodiment includes a drive mechanism configured to impact a fastener, a lever arm pivotable between a first position and a second position, and a motor including a plurality of permanent magnets mounted on a rotatable housing, the motor mounted on the lever arm such that when the lever arm is in the first position, the rotatable motor housing is isolated from the drive mechanism and when the lever arm is in the second position, the rotatable motor housing is positioned to transfer rotational energy to the drive mechanism.

Abstract: A power beating device using includes a driving unit and an actuator. The driving unit has a spring for storing and releasing energy so as to drive an impact unit. The driving unit has at least one driving surface. The actuator serves for actuating the driving surface so that the impact unit is lifted with the driving unit. Deformation of the spring will store energy. When the impact unit is lifted to a predetermined height, it will rest and then the spring will release energy to drive the impact unit to have the effect of beating.

Abstract: A refill for staples, which can not be removed from a cartridge unless all sheet-type connected staples in a stapler body are delivered. A refill for staples is installed in a detachable manner in a stapler body, and includes a refill body which holds the sheet-type connected staples, and a pressing member which presses the sheet-type connected staples. A delivery port delivering the sheet-type connected staples and a locking plate provided with a locking section which locks a locked section in the stapler body are formed in the refill body. When the sheet-type connected staples are pressed, the pressing member is engaged with the locking plate not to allow rotation of the locking plate, and, when the sheet-type connected staples are not pressed, the pressing member is disengaged from the locking plate to allow rotation of the locking plate. Thereby, the locking section of the locking plate can be removed from the locked section in the stapler body.

Abstract: A table including a clincher mechanism is provided to be supported pivotably by a rear portion of a main body frame, the table is integrally formed with a wing piece 9 projected along the main body frame, a locking device is formed between the wing piece of the table and the main body frame, and by engaging the locking device with the wing piece, a pivoting force in an opening direction of the table is hampered.

Abstract: A stapler for stapling together a workpiece, primarily a sheaf of papers, in which the stapler comprises a stapling unit and an anvil, which interacts with the stapling unit and on which the workpiece is placed, and against which stapling is performed, which stapling unit and an anvil are, driven relative to each other in a reciprocating stapling movement, during which movement stapling takes place, the stapling unit comprises a frame and a staple cassette which houses staple blanks and which is exchangeable, and which is detachably connected to the frame by attachment devices, and the staple blanks are fed one by one to an outlet channel by a feeding device incorporated in the stapler.

Abstract: A tool with a structure, a driver that reciprocates along an axis between a returned position and an extended position and a bumper that is coupled to the structure so as to be disposed between the structure and the driver. The bumper includes a beat piece and a damper.

Abstract: An opening portion (104) is formed at a rear face of a staple cartridge (103), a slide door (106) is provided at the opening portion (104), and the slide door (106) is maintained at a closing position by a tension coil spring (107). When the slide door (106) is pushed down, also a pressing plate (109) is moved down by being pushed by the slide door, the opening portion (104) is opened and a staple pack (121) can be inserted into the cartridge. A staple can be refilled to an electric stapler (101) in a state of mounting the staple cartridge (103), and time and labor of attaching and detaching the staple cartridge is dispensed with.

Abstract: A device that generally includes a multistage solenoid having at least a first stage, a second stage and an armature member that travels therebetween. The device also includes a control module connected to the multistage solenoid. The control module detects a position of the armature member relative to at least one of the first stage, the second stage and a combination thereof. The control module adjusts a magnetic field of the at least one of the first stage, the second stage and the combination thereof based on the position of the plunger armature relative thereto.

Abstract: A tool (12) has a body (14) having an opening (16) forming a barrel (18) which has a top and a bottom (20 and 22), an opening (30) at the bottom (22), and a pressure input (44) for fluid communication. The barrel (18) receives a piston (24) and a magnet (23) which is contiguous with the pressure input (44). An actuator pin tube (26) is received in the opening (30) at the bottom (22) of the barrel (18), and an actuator pin (38) is engaged in the tube (26). A second opening (28) may be disposed in the top (20). A kit (110) containing the tool (12), hose (94), cartridges (84) and a pump (P). A method for using the tool (12) is also contemplated hereby. Multiple tools (12) may be detonated at the same time by hooking them up to a manifold (95 or 95?).

Abstract: From top to bottom of an inner wall of a case in which stacked stapled sheets each composed of linear staples connected in parallel are accommodated, horizontal nonreturn projections are successively arranged. A nonreturn lug is attached to a staple pushing plate pushing the staple sheets by a spring, and the nonreturn lug is engaged with the nonreturn projections of the case. The nonreturn lug and the nonreturn projections are shaped to permit a descent of the staple pushing plate and inhibit an ascent thereof. In addition, a height of an apex of each of the nonreturn projections is reduced step-wise or with no step from top to bottom of the inner wall of the case.

Abstract: A hand-held fastener driver for fastening elements, having a driving tappet that is movably mounted in a tappet guide and that can be driven using at least one drive spring element is disclosed, having a tensioner for the drive spring element, and having a locking mechanism. In a locked position of the locking mechanism, the drive spring element can be locked in its tensioned position, whereby the tensioner has a tensioning element that is provided with a profile, and said tensioning element can be axially moved along a longitudinal axis of motion using a rotatable counter-element that is engaged with the profile and that can be driven by a motor.

Abstract: A tool with a driver, a structure, a motor assembly and a bumper. The driver has a plurality of bumper tabs, each of the bumper tabs having an arcuate first contact surface that is formed about a tab axis, each tab axis being generally perpendicular to a translation axis about which the driver translates. The motor assembly is coupled to the structure and configured to selectively translate the driver along the translation axis. The bumper abuts the structure and includes a plurality of bumper members. Each bumper member is located in-line with an associated one of the bumper tabs and includes an arcuate second contact surface that is formed about an axis that is generally orthogonal to the translation axis and the tab axis.

Abstract: A stapler has a table formed with a clincher mechanism at a front end and is rotatably supported on a frame. A pair of locking plates slidably supported along the frame between the table and the frame prevents the clincher mechanism from rotating in a direction in which the clincher mechanism moves toward a staple driving section. Drive cams are provided independently for each of the locking plates to drive the locking plates. The times at which the respective locking plates are pulled out from between the table and the frame by the respective drive cams are shifted from each other.

Abstract: A method of driving a fastener into a workpiece with a tool generally includes retracting a trigger into a housing of the tool to execute a driver sequence and establishing a magnetic field in a multistage solenoid. The magnetic field is established in at least one of a first stage and a second stage. The method includes drawing an armature member to an extended condition from a retracted condition with the magnetic field and determining a position of the armature member relative to at least one of the first stage and the second stage. The method also includes directing power between the first stage and the second stage during the driver sequence based on the position of the armature member.

Abstract: A device for impacting a fastener in one embodiment includes a drive mechanism, a flywheel pivotable between a first flywheel position whereat the flywheel is not in contact with the drive mechanism and a second flywheel position whereat the flywheel contacts the drive mechanism, a motor operably connected to the flywheel, a trigger movable between a first trigger position and a second trigger position, and a WCE assembly movable between a first WCE position and a second WCE position, the WCE assembly configured such that (i) when the trigger is in the first trigger position and the WCE assembly is in the first WCE position, the WCE assembly mechanically engages the trigger to preclude movement of the trigger out of the first position, and (ii) when the WCE assembly is in the second WCE assembly position, the WCE assembly does not mechanically engage the trigger.

Abstract: A clincher mechanism 7 is provided with a clincher member 10 having an inductive guiding face 11 for bending and guiding staple legs; a sheet-shape piece 12 arranged between the inductive guiding face and sheets; and operating pieces 18 for advancing/retracting the sheet-shape piece 12 onto the inductive guiding face of the clincher member 10. The staple legs penetrated the sheets are guided along the lower surface of the sheet-shape piece 12, and the sheet-shape piece 12 is operated by the action of operating pieces 18 so that it is extracted from between the staple legs. A paper pan 26 for guiding the sheets is arranged swingably above the clincher mechanism 7. The operating pieces 18 are operated through the paper pan 26 which is swung by the action of the staple driving portion 2.

Abstract: A fastening device that drives one or more fasteners into a workpiece generally includes a tool housing and a multistage solenoid contained in the tool housing. The multistage solenoid includes an armature member that travels through at least a first stage, a second stage, and a sense coil disposed therebetween. A driver blade assembly includes a blade member connected to the armature member. The driver blade assembly is operable between an extended condition and a retracted condition. A control module determines a position of the armature member relative to at least one of the first stage and the second stage based on a signal from the sense coil. The trigger assembly is connected to the control module and partially contained within the housing. The trigger assembly is operable to activate a driver sequence that moves the driver blade between the retracted condition and the extended condition.

Abstract: A method for controlling a driving tool having a power source, a driver, an actuator, a follower, and a control unit. The power source includes a motor and a flywheel that is driven by the motor. The actuator is configured to selectively move the follower to push the driver into frictional engagement with a surface of the flywheel. The control unit is configured to selectively activate the electric motor and the actuator. The control unit includes a speed sensor that is configured to sense a rotational speed of an element of the power source and produce a speed signal in response thereto. The method includes: directly determining a rotational speed of an element in the power source; controlling electrical power provided to the motor based on the rotational speed of the element in the power source to cause the flywheel to rotate at a predetermined speed; and actuating the actuator when a set of actuating criteria has been met, the set of actuating criteria not including a rotational speed of the element.

Abstract: A driving tool that has a driver support base. The driver support base includes a transmitting portion having a V-shape in cross section. The driver support base can be pressed by a press member to cause the transmitting portion to wedge between a pair of left and right drive wheels, so that a friction force is produced to move the driver support base.

Abstract: A fastener driving tool has a housing, a nose portion, a magazine, a motor, a plunger, a drive mechanism, a trigger switch, a detection switch, an energizing switch, a failure detection circuit. The magazine is configured to store and supply a fastener to the nose portion. The motor is provided in the housing. The a plunger is provided in the housing to move between a top dead center and a bottom dead center. The plunger has a blade for impacting the fastener. The drive mechanism is configured to drive the plunger with power from the motor. The trigger switch is configured to drive the drive mechanism, and operated by a user. The detection switch is configured to be switched according to an arrangement of the drive mechanism. The energizing switch is configured to control power feed of the motor. The energizing switch is switched by the trigger switch and the detection switch.

Abstract: It is an object of the present invention to increase durability of a driving tool. A representative driving tool comprises an elongated operating member that drives in a driving material and a drive mechanism that drives the operating member. The drive mechanism comprises a rotating flywheel and the flywheel includes an inner wheel and an outer wheel which are concentrically disposed to each other. The inner circumferential surface of the outer wheel is fitted on an outer circumferential surface of the inner wheel. The outer circumferential surface of the outer wheel directly contacts the operating member and thus, the rotational force of the flywheel is transmitted from the inner wheel to the operating member via the outer wheel and the drive mechanism linearly moves.

Abstract: A fastener driving tool arranged to drive fasteners into a workpiece includes at least one electric motor having a central stator and an external rotor arranged to rotate around the stator. The rotor may be in the form of a flywheel. The tool includes an energy transfer member such as a driver arranged to transfer kinetic energy from the rotor to a fastener held in the tool, thereby to drive the fastener from the tool into a workpiece. The electric motor may be a brushless motor. The tool may include two such motors, arranged such that both of their rotors propel the driver simultaneously.

Abstract: A stapler comprises a stapling unit and a base movably connected to each other. The base comprises an anvil, a lower and an upper part with a contact surface which has a staple opening against which a workpiece is placed. The upper and lower parts are movably connected to each other. In operation, movement of the stapling unit and the base toward each other drives a staple into the workpiece, wherein the staple crown comes in contact with the workpiece and the staple legs extend through the staple opening. Upon movement of the upper part and stapling unit toward the lower part, the staple legs are bent by the anvil into contact with the underside of the workpiece. The anvil is attached to the base by an elastic element between the lower and upper part, and is urged toward the staple opening to block the opening when the stapler is in an initial position.

Abstract: A stapler having ergonomic benefits includes a housing situated along a principal axis. The housing is conformed to include a handle and a head with a staple discharge opening spaced apart from the handle along the principal axis. A generally planar knife is within the head and oriented in parallel to a plane defined by an intersection of the principal axis and a normal axis. A magazine includes a sole at the staple discharge opening. The sole receives at least one first strip of staples. The first strip of staples is aligned such that the bight of a first staple within the strip of staples is parallel to the principal axis and the first strip is aligned with a lateral axis orthogonal to both of the principal and normal axes.

Abstract: An electric driving machine includes a remaining fastener sensor 257 which detects the amount of fasteners (e.g., nails) remaining, in an aligned and held manner, in a magazine 2 and which generates a residual-quantity signal (a signal showing depletion of fasteners) when the amount of remaining fasteners has decreased to a predetermined level or less; a remaining fastener detection circuit 406 which outputs a control signal (a signal of level 0) for controlling control means (299, 283, and other means) in accordance with an input of the residual-quantity signal (a switch-on signal) generated by the remaining fastener sensor 257; and a delay circuit 401 for delaying the remaining signal (the ON signal) generated by the remaining fastener sensor 257 by a predetermined period of time (e.g., 20 milliseconds) and inputs the thus-delayed remaining signal to the remaining fastener detection circuit 256 (406).

Abstract: An opening portion (104) is formed at a rear face of a staple cartridge (103), a slide door (106) is provided at the opening portion (104), and the slide door (106) is maintained at a closing position by a tension coil spring (107). When the slide door (106) is pushed down, also a pressing plate (109) is moved down by being pushed by the slide door, the opening portion (104) is opened and a staple pack (121) can be inserted into the cartridge. A staple can be refilled to an electric stapler (101) in a state of mounting the staple cartridge (103), and time and labor of attaching and detaching the staple cartridge is dispensed with.

Abstract: A power tool, such as a nailer, having a driver, a flywheel and an activation arm for selectively driving the driver into contact with the flywheel to transfer energy therebetween to cause the driver to translate. The power tool includes a wedging member that may be moved so as to resist movement of the activation arm in a direction that would bring the driver into contact with the flywheel. A method for operating a power tool is also provided.

Abstract: An opening portion (104) is formed at a rear face of a staple cartridge (103), a slide door (106) is provided at the opening portion (104), and the slide door (106) is maintained at a closing position by a tension coil spring (107). When the slide door (106) is pushed down, also a pressing plate (109) is moved down by being pushed by the slide door, the opening portion (104) is opened and a staple pack (121) can be inserted into the cartridge. A staple can be refilled to an electric stapler (101) in a state of mounting the staple cartridge (103), and time and labor of attaching and detaching the staple cartridge is dispensed with.

Abstract: An actuator is arranged in a housing of an electrical nail gun. The actuator includes a sliding base, an external-running brushless direct current motor, a swing base and an electric driver. The sliding base is slidably disposed on an end of a located supporter which is positioned in the housing. The sliding base loads a spring and forms a hitting nail bar thereon. The motor has a stator and a rotator attached on an outer wall of the stator. A flywheel is driven by the motor and is configured to engage or disengage with/from the sliding base. The swing base is pivotally mounted on the housing. The swing base is adjacent to the sliding base and the supporter. The motor is installed in the swing base. The electric driver is attached to the housing and is adjacent to an end side of the swing base. The electric driver has a rod member driven by electricity.

Abstract: A clutch mechanism arranged in a housing of an electrical nail gun includes a sliding base, a driver driven by electricity, a swing base pivotally mounted on the housing, and an electric driver attached to the housing and being adjacent to an end side of the swing base. The sliding base is slidably disposed on an end of a free roller positioned in the housing, and the sliding base loads a spring and forms a hitting nail bar thereon. The driver has a motor and a flywheel driven by the motor, and the flywheel is configured to engage or disengage with/from the sliding base. The swing base is adjacent to the sliding base and the free roller and receives the driver therein.

Abstract: An actuator is arranged in a housing of an electrical nail gun. The actuator includes a sliding base, an external-running brushless direct current motor, a swing base and an electric driver. The sliding base is slidably disposed on an end of a located supporter which is positioned in the housing. The sliding base loads a spring and forms a hitting nail bar thereon. The motor has a stator and a rotator attached on an outer wall of the stator. A flywheel is driven by the motor and is configured to engage or disengage with/from the sliding base. The swing base is pivotally mounted on the housing. The swing base is adjacent to the sliding base and the supporter. The motor is installed in the swing base. The electric driver is attached to the housing and is adjacent to an end side of the swing base. The electric driver has a rod member driven by electricity.

Abstract: A method of driving a fastener into a workpiece with a tool generally includes retracting a trigger into a housing of the tool to execute a driver sequence and establishing a magnetic field in a multistage solenoid. The magnetic field is established in at least one of a first stage and a second stage. The method includes drawing an armature member to an extended condition from a retracted condition with the magnetic field and determining a position of the armature member relative to at least one of the first stage and the second stage. The method also includes directing power between the first stage and the second stage during the driver sequence based on the position of the armature member.

Abstract: Circuit-breaker arrangement (32) in an indicating arrangement (33) forming part of an electrically powered stapler (1). The stapler comprises a stapling head (2) and an anvil (3). The stapling head comprises an interchangeably fitted staple cassette (5) containing staple blanks (36), and the indicating arrangement. The circuit-breaker arrangement is so positioned that it is moved by the staple cassette from a first to a second position when the staple cassette is fitted to the stapling head and when the power supply via the indicating arrangement changes. The circuit-breaker arrangement (32) comprises an input line (22) and output line (23), of which at least the input line is dimensionally stable and resiliency flexible.

Abstract: A hand-held drive-in tool for driving fastening elements in includes a drive-in ram (13) displaceably supported in the guide (12), a spring member (31) for displacing the drive-in ram (13), a device (70) for preloading the driving spring member (31) and a locking device (50) having a locking position (54) in which the locking device (50) retains the driving spring member (31) in its preloaded position (22) and includes an annular member (49) pivotally arranged on the locking device (50) and rollable off the locking stop (53) provided on the drive-in ram (13).

Abstract: A hand-held drive-in power tool for driving in fastening elements includes a drive-in ram displaceable in a guide located in the tool housing, a drive for driving the drive-in ram and including at least one preloaded drive spring, a tensioning device for preloading the drive spring, and a transmission mechanism arranged between the drive spring and the drive-in ram.

Abstract: A fastening device drives one or more fasteners into a workpiece. The fastening device generally includes a tool housing and a multistage solenoid having at least a first stage, a second stage and an armature member that travels therebetween. The multistage solenoid is contained within the tool housing. A driver blade is connected to the armature member. The driver blade is operable between an extended condition and a retracted condition. A control module determines a position of the armature member relative to at least one of the first stage, the second stage and a combination thereof. A trigger assembly is connected to the control module and activates a driver sequence that moves the driver blade member between the retracted condition and the extended condition. The control module directs power between the first stage and the second stage based on the position of the armature member relative thereto.

Abstract: A slide frame is mounted on a driver unit that can be vertically reversed on a base frame. A guide pin disposed in the slide frame engages with a concave portion of a cam plate portion formed in the base frame. When a fixation releasing handle of the driver unit is operated, a lever pushes the slide frame to slide the slide frame and the guide pin is deviated from the concave portion to rotate the driver unit. In a state where the driver unit is fixed in a regular posture, since the guide pin is pushing a switch lever, the detection switch is kept turned ON and thus an electric stapler is in an operable state. When the driver unit is rotated, the switch lever is released from the press of the guide pin and the detection switch is turned OFF, thereby cutting off the power.

Abstract: A hand-held drive-in tool for driving fastening elements (60) in a workpiece (U) includes a drive-in ram (13) displaceable in a guide (12), a spring (31) for driving the drive-in ram (13), a tensioning device (70) for loading the driving spring (31), a locking device (50) for retaining, in its locking position (54), the driving spring (31) in its loaded position thereof (33), and a sliding nut (78) supported on a threaded spindle (76), which is rotatable by the motor (71) of the tensioning device (70), without a possibility of rotation thereabout but with a possibility of an axial displacement therealong, the sliding nut (78) being axially displaceable, upon actuation of the motor (71) of the tensioning device (70) by a control unit (23) of the drive-in tool (10), from the first end position (83) to the second end position (84) for displacing the driving spring (31) into the loading position (33) of the driving spring (33), and being subsequently displaceable from its second end position (84) into the first e

Abstract: A transmission mechanism for an electric nail gun includes a linear transmission unit and a rotary transmission unit in a housing of the electric nail gun. The rotary transmission unit includes an electric driven driving wheel. The linear transmission unit includes a rack and a hitting bar. The hitting bar is disposed at a bottom of the linear transmission unit. The rack is in mesh with the driving wheel, slidably installed in the housing by a spring force, and configured to receive driving from the driving wheel and to drive the hitting bar to move linearly downward so as to hit a nail.

Abstract: A counterforce-counteracting device for a nailer comprises an active device, a rotating member, and a weight device. The active device drives the rotating member and the weight device to move. After the active device moves, the weight device is driven by the rotating member to produce a counterforce, so as to counteract the counterforce of the nailer. Thereby, such a device is secure and is easy to assemble.

Abstract: It is an object of the invention to provide an improvement of the operability in a driving operation using a power tool.

Abstract: A transmission mechanism for an electrical nail gun includes a rotary transmission unit and a linear transmission unit in a housing of the electrical nail gun. The rotary transmission unit includes a motor driven by electricity, a flywheel driven by the motor and extending to form a cylinder thereon, a solenoid activated by electricity, and a moveable driving wheel adjacent to an end side of the cylinder. A clutch is formed between the cylinder and the driving wheel. The solenoid is buried in the cylinder so that a magnetic conductivity loop is constructed around the solenoid to produce the magnetic field when the solenoid is activated.

Abstract: A device for applying insulated fasteners to a substrate is disclosed. The device comprises a housing that includes a fastener recess and an ejection recess, and the fastener recess is configured to accommodate insulated fasteners. The device further comprises a powered actuator that includes an ejection member that moves over a range of positions. The ejection member permits one of the insulated fasteners to enter the ejection recess in a retracted position, and the ejection member forces the one of the insulated fasteners to leave the ejection recess in an extended position. A power connector operatively connects the powered actuator to a power source to provide power to move the ejection member. A manual actuator is operatively disposed between the power source and the powered actuator to selectively provide power from the power source to the powered actuator.

Abstract: A method for calibrating a power tool having a roller, a driver and a solenoid. The solenoid has a body and a rod and is coupled to the roller so as to be capable of selectively advancing the roller toward the driver. The method includes: locating the roller onto a predetermined portion of the driver; moving the body of the solenoid in a first direction until the occurrence of a first predetermined condition, the first direction being in a direction that causes the roller to be driven toward the driver; after the occurrence of the first predetermined condition, moving the body of the solenoid in a second direction opposite the first direction until the occurrence of a second predetermined condition and thereafter securing the body of the solenoid to inhibit further movement of the body of the solenoid.

Abstract: A drive-in tool for driving in fastening elements includes a driving ram (13) displaceable in a guide (12) and driven by a drive flywheel (32), a drive unit (30) having an electric motor (31) for rotating the drive flywheel (32), a drive coupling (35) for connecting a coupling section (15) of the driving ram (13) with the at least one drive flywheel (32), and an acceleration device (40) for accelerating the driving ram (13), together with the coupling section (15) in a direction of the drive flywheel (32).

Abstract: A fastener driving device is disclosed. The device includes a housing assembly, and a nose assembly connected to the housing assembly. The device also includes a magazine for carrying a supply of fasteners that are provided to the nose assembly, a fastener driver, and a spring that moves the fastener driver through a drive stroke. The spring includes a composite material. The device also includes a motor for moving the fastener driver through a return stroke.

Abstract: Even when a transient decrease has arisen in a battery voltage VBAT of a battery pack at startup of a motor that drives a flywheel, a power terminal Vcc and a reset terminal RES (or an input terminal IN of a reset IC) of a microcomputer are replenished with a normal voltage by the voltage accumulated by a capacitor of the backup power circuit, and hence a controller can maintain normal operation without involvement of faulty operation. As a result, even the battery pack whose battery has a smaller amount of remaining energy can be effectively utilized as the power source of an electric driving machine.

Abstract: A nailer device has a housing containing a motor and a striking device arranged in a compact manner. A transmission mechanism is mounted in the housing for translating the rotating motions of the motor into the periodic impact motions upon the striking device. The transmission mechanism includes an impact assembly which imparts the periodic impact motions upon the striking device.

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.