TWI444260B - Screw lock machine - Google Patents

Description

Screw lock machine

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a pneumatic tool that uses compressed air as a power source, and more particularly to a screwdriver that can be screwed at a tip end while rotating it in an axial direction to lock (lock in) the screw. Screw locking machine for workpiece.

For example, when a gypsum board to be screwed on a wood as a substrate is used, a screw locker that can continuously lock a plurality of screws can be used. The screw-locking machine constitutes a thrust (locking force) of a piston that uses compressed air as a power source, and a rotational force (screw-fixing force) of the air motor to rotate the screwdriver bit and move it in the axial direction. According to the above configuration, during the movement of the bit bit, the tip end of the bit bit can be fitted to the screw head at the front end of the column in the connecting band in which a plurality of screws are connected in parallel, so that the screw is detached from the screw connecting band, and The screw is directly rotated and penetrated through the upper material to lock (lock) to the substrate, and the upper material is screwed to the substrate.

Regarding the technique of the above-described screw-locking machine, the technique disclosed in Japanese Laid-Open Patent Publication No. 2000-6040 is known in the past. This conventional technique is configured such that when the piston is moved to the vicinity of the lower shift end, the compressed air of the piston homing in the circulating air chamber (circulation accumulating chamber) into which the compressed air flows is stopped, and the supply of air to the air motor is stopped.

As described above, the above-mentioned conventional air motor stopping mechanism is configured to block the supply of air to the air motor once the air to be compressed flows into the circulating air chamber from the upper chamber of the cylinder before the piston moves to the lower end thereof, and stops. The air motor. However, the compressed air is changed by the influence of conditions such as the ambient temperature. As a body of pressure and so on. Therefore, it is difficult to precisely control the stopping time of the air motor by means of the in-vivo type.

Moreover, in general, the movement of the screw of the screw-locking machine with the screwdriver bit (the screw-locking action) is performed by the compressed air supplied to the upper chamber of the cylinder, and the piston moves upwards. The bit movement is performed by the compressed air (circulating air) supplied from the circulating air chamber toward the lower chamber of the tubular portion.

The circulating air chamber is usually provided along the outer peripheral side of the tubular portion, and communicates with the inner peripheral side of the tubular portion via a check valve (circulation vent) provided on the lower portion of the tubular portion. When the piston moves down, once it passes through the one-way valve, compressed air will flow from the upper chamber of the cylinder through the one-way valve into the circulating air chamber. The compressed air flowing into the circulating air chamber acts on the lower side of the piston (the lower chamber of the cylinder) through a circulation hole provided at the lower end portion of the tubular portion. Therefore, after the screw lock is completed, the user releases the trigger lever of the starting operation, and blocks the supply of compressed air to the upper chamber of the cylinder, and opens the upper chamber of the cylinder to the atmosphere, and the piston passes through the circulation hole. The compressed air acting on the lower side of the circulating air chamber moves up and returns to the top dead center. In addition to the above-mentioned Japanese Patent Publication No. 2000-6040, there is Japanese Patent No. 3793272.

Secondly, in Japanese Laid-Open Patent Publication No. 2000-6040, once the piston moves to the vicinity of the lower shifting end and the compressed air flows into the circulating air chamber, the air pressure thereof causes the switching valve to act to close the air supply passage of the compressed air to the air motor. The piston is moved to the lower end and the air motor is also stopped.

However, the above conventional screw locker has the following problems. That is, the compressed air that flows into the circulating air chamber returns the piston to the top dead center side, and the time when the compressed air starts to flow into the circulating air chamber is set in a stage before the piston is completely moved to the bottom dead center. Therefore, the piston is completely moved to the bottom During the point of the point, the compressed air in the circulating air chamber has acted under the piston and the air motor may have stopped. When the piston is completely moved to the bottom dead center and the screw is locked, if the compressed air acts on the lower side of the piston (the lower chamber of the cylinder), the thrust (screw force) of the piston will decrease, and the screwdriver bit may occur. The so-called detachment of the apex from the screw head, or the rotation output of the air motor is stopped, resulting in incomplete screwing.

The present invention has been completed in view of the above circumstances. The purpose is to provide a screw locker with better controllability of a pneumatic motor or piston.

The first aspect of the present invention is a screw-locking machine comprising: a pneumatic motor for rotating a screwdriver bit for locking a screw in a screw-solid direction; and a piston for moving the aforementioned bit to a screw-locking direction; a gas supply passage for supplying compressed air for driving the air motor; and a passage blocking device for allowing or blocking supply of compressed air to the air motor via the air supply passage; and the passage blocking The device uses the action of the aforementioned piston to move the lower end as a power. In addition, the passage blocking device preferably has a passage blocking member that is movable in a moving direction of the piston, and the passage blocking member is adapted to be moved to the lower end with the piston, and moved downward by the piston. Move in direction.

According to the above configuration, once the piston is moved to the lower moving end to lock the screw, the passage blocking member will move toward the downward movement of the piston, thereby blocking the supply of compressed air to the air motor to stop the air motor. As described above, the air motor can be stopped by moving the body, that is, the piston, and moving the passage blocking member as the air passage switching valve to close the air supply passage of the compressed air. Therefore, the air motor can be blocked by the inflow of compressed air having no body, and the air motor can be controlled with higher precision. Stop time.

As described above, the passage blocking member is moved in accordance with the movement of the piston to block the supply of compressed air to the air motor, so that the time when the piston is moved to the lower end and the time when the air motor is stopped will not be different. This represents the time to precisely control the stop of the air motor.

Preferably, the passage blocking member is subjected to a potential energy in a direction in which the piston moves upward at least before the piston moves to the lower end. According to the above configuration, it is possible to absorb the impact of the piston moving to the stage of the lower shift end and to surely move the passage blocking member to the passage blocking side. The passage blocking member, in addition to constituting the initial state of the screw locker, is often subjected to the potential energy toward the upper side of the piston (when the biasing member is used, such as a spring), and may constitute at least the stage before the piston moves to the lower shift end. Inside, the action such as compressed air moves toward the upper side of the piston. According to the above configuration, the passage blocking member can be surely moved to the passage blocking position side in the stage in which the piston is moved to the lower moving end, thereby forming a gas supply passage that reliably blocks the compressed air to the air motor. .

In one embodiment, the passage blocking member is for restricting the damper of the lower piston end position. According to the above configuration, the piston can be moved downward to abut against the air lock, and the lower end of the piston can be restricted. Once the piston of the body moves to the lower shift end, the movement of the air lock will block the compressed air to the air supply passage of the air motor, thus stopping the air motor. As described above, according to this configuration, the movement of the piston of the body object toward the lower end can close the air brake as the air passage opening and closing valve, and the air motor can be stopped. Therefore, the time at which the air motor is stopped can be controlled with higher precision than the conventional configuration, and thereby the same effects as those described above can be obtained.

In addition, the air lock can also be used to close the compressed air to the air motor in addition to the general function of restricting the piston to the lower end and absorbing the impact. The function of the on-off valve (valve) of the gas passage. Thereby, the above-mentioned channel switch function can be added without increasing the number of components, thereby increasing the added value of the above-mentioned screw locker.

Preferably, the air brake is subjected to the potential energy imparted by the compressed air and/or the spring toward the upward movement of the piston. According to the above configuration, the potential energy can be imparted to the air lock in the upward direction of the piston. The method of imparting potential energy to the air brake may be a compressed air or a spring, or both compressed air and a spring may be used as a method of imparting potential energy. If the spring energy is applied to the potential energy method and the force of the spring can be adjusted from the outside, the time during which the air motor is stopped can be arbitrarily adjusted.

Moreover, the passage blocking member is subjected to the potential energy in the upward movement direction (reverse locking direction) of the piston, so that the reaction force during the locking will cause the screw locker body to move up, and the piston abuts the passage blocking member. As a result, even if the passage blocking member is moved to the closed side of the passage, the air motor will be stopped after a certain period of time (the time required to move the passage blocking member to the closed side against the biasing force). Therefore, even if the lock mechanism body is moved up by the reaction force, the air motor will rotate during the period of the predetermined time (the piston is moved to the lower shift end, and the air motor is stopped later). Therefore, the problem of so-called incomplete locking does not occur. Therefore, the user does not need to care about the reaction force when the lock is engaged, and pushes the body of the lock machine with a slight force, so that the operability of the screw locker can be improved.

A second aspect of the present invention is a screw-locking machine comprising a compressed air supply device for supplying a supply of compressed air for driving a pneumatic motor when the piston is moved to a lower moving end (bottom dead center). The passage supplies compressed air to the lower side of the piston to move the piston upward.

According to the above screw locking machine, once the piston is moved to the lower moving end, the compressed air can be supplied to the cylinder by the flow path for supplying compressed air to the air motor. The lower chamber (the lower side of the piston) moves the piston up by the compressed air. In this way, it is not necessary to provide a check valve in the cylinder as in the past, and when the piston passes through the one-way valve, the compressed air in the upper chamber of the cylinder flows into the circulating air chamber, and the compressed air in the circulating air chamber is used as a The compressed air that moves the piston up.

Moreover, the compressed air used to drive the air motor can be converted into compressed air for moving the piston upward, so that the stopping action of the air motor and the movement above the piston can be moved to the lower shift end after the piston is moved. The above two actions are performed at the same time point (simultaneously). In this way, after the thrust of the piston is fully exerted, the air motor can be stopped, and since the piston is moved upward, the problem of so-called shedding or incomplete locking of the screw can be surely prevented.

In one embodiment, the compressed air supply device has a flow rate switching valve that can switch the communication target of the air supply passage when the piston moves to the lower end. The operation of the flow switching valve can stop supplying compressed air to the air motor and supply compressed air to the lower side of the piston. According to the above screw locking machine, the stopping of the air motor and the circulating air supply to the lower chamber of the cylinder portion can be performed by the movement of the flow switching valve of the single member, so that the above-mentioned effects can be realized by simple construction, and the error can be constituted. A mechanism with fewer movements.

Preferably, the flow switching valve includes a damper for restricting the lower end of the piston. According to the above configuration, the air lock can be combined with the function of the flow switching valve, and the simplification of the structure and the prevention of the erroneous action can be further achieved.

Preferably, the air lock is provided to be movable up and down along a moving direction of the starter bit to a lower end portion of the tubular portion for receiving the piston. When the air brake is moved upward, the lower end portion of the tubular portion is sealed by the air lock, and the air supply passage for supplying the compressed air to the air motor is connected with the pneumatic horse. When the piston is moved to the lower moving end, the air brake is moved downward by the thrust of the piston, and the air supply passage for supplying compressed air to the air motor is closed to the air motor, and the air supply passage is the same as the foregoing The lower side of the piston is connected. According to the above configuration, the air lock for restricting the lower end of the piston can be used as an on-off valve for the lower chamber of the flow switch barrel. Once the air lock of the flow switching valve as a single component moves up, the lower chamber of the cylinder can be closed by the flow path and the piston can be smoothly moved underground (the occurrence of the lock thrust), and the compressed air will also be supplied to the air motor to make the air motor Rotate, thereby making sure the screw is locked.

When the screw lock is completed and the piston is moved to the lower shift end, the air lock is opened and the flow path is closed to the air motor side, and at the same time, the air chamber is opened to stop the air motor and supply circulating air. As described above, after the screw is locked, the air motor is stopped, and the circulating air is supplied to the lower chamber of the cylinder portion, so that the problem of so-called shedding and incomplete locking of the screw can be prevented.

Preferably, the air damper is moved upward to cause the compressed air of the air supply passage to act on the lower side of the air lock, and the damper is biased toward the upper moving side. According to the above configuration, the air lock as the single flow switching valve can be formed in a state in which the potential energy of the upwardly moving side is received by the pressure of the compressed air. Therefore, it is not necessary to separately use a spring or the like to impart a potential energy to the damper toward the upward moving side, and simplification of the construction of this portion can be achieved.

Moreover, the air supply passage preferably includes a ventilation chamber located below the piston when the piston is located at the lower end. Further, the air motor may preferably receive the supply of compressed air from the air supply passage before the piston has moved to the lower shift end.

Another aspect of the present invention is a screw lock machine including a control device provided for supplying air to a compressed air for driving a pneumatic motor The track can control at least a part of the operation of the piston or the air motor, and the control device uses the action of the piston toward the lower end as the power.

In one embodiment, the control device is a channel blocking device that allows and blocks compressed air to be supplied to the air motor via the air supply passage.

Further, in another embodiment, the control device is a compressed air supply device that supplies compressed air to the lower side of the piston from the air supply passage when the piston is moved to the lower end. .

Next, an embodiment of the present invention will be described based on the first to sixteenth drawings. The first figure and the second figure show the non-operating state (initial state) of the screw-locking machine 1 of the present embodiment. The screw locker 1 includes a main body portion 2 having a substantially cylindrical shape, and a handle portion 3 provided to protrude from a substantially central portion of the main body portion 2 in a longitudinal direction. A trigger valve 4 is disposed near the base of the handle portion 3. The trigger valve 4 can be opened and closed by the user pulling the trigger 5 with the fingertip. The trigger valve 4 itself is the same as those known to those skilled in the art, and detailed descriptions of its construction and operation are omitted.

Once the user pulls the operation trigger 5, a screw S will be locked from the front end (lower end in the first figure) of the body portion 2 toward the workpiece W. The workpiece W is a two-layer structure having an upper material W1 such as a gypsum board, and a base material W2 such as a wood board or a steel plate.

The tip end of the handle portion 3 is connected to an air hose 6 for supplying compressed air as a power source of the screw locker 1. Compressed air is supplied from the air hose 6 to the pressure accumulation chamber 7 inside the handle portion 3. Further, the inside of the handle portion 3 is provided with an exhaust pipe 8 along its longitudinal direction. One end side (exhaust port 8a) of the exhaust pipe 8 is opened at the tip end portion of the handle portion 3. The other end of the exhaust pipe 8 The side communicates with the exhaust chamber 8b provided in the body portion 2.

Between the lower portion of the main body portion 2 and the tip end portion of the handle portion 3, a magazine 11 for arranging a plurality of screws S to S screwing (not shown) is disposed, and the cartridge 11 can be pulled from the magazine 11 The screw-connecting belt is a screw-connecting belt conveying mechanism 12 that intermittently feeds the side of the main body 2 at a distance corresponding to the distance between the adjacent screws S.

The main body portion 2 includes the striking mechanism portion 20, the air motor 50, and the speed reduction mechanism portion 70 in this order from the upper side to the lower side in the first drawing. As shown in the figure, the striking mechanism portion 20 is disposed on the upper side with respect to the handle portion 3, and the air motor 50 and the speed reducing mechanism portion 70 are disposed on the lower side.

The striking mechanism portion 20 includes a tubular portion 21 and a piston 22 housed therein. The piston 22 is housed in the tubular portion 21 and is reciprocally movable in the up and down direction in the first drawing. Hereinafter, the air chamber inside the tubular portion 21, that is, the airtight upper side space, which is the piston 22, is referred to as the upper chamber portion 24, and the lower space is referred to as the lower chamber portion 25.

The tubular portion 21 is held inside the retaining sleeve 27 and is not movable. The retaining sleeve 27 is fixed relative to the body casing 2a of the body portion 2.

The center of the lower portion of the piston 22 is coupled to the upper end portion of the driver bit 23, and is rotatable about its axis and is not movable in the axial direction. The driver bit 23 is extended downward from the center of the lower portion of the piston 22 (the screw locking direction), and the lower end portion reaches the vicinity of the tip end portion of the body portion 2.

An overhead valve 30 having a cylindrical shape is disposed on the outer peripheral side of the upper portion of the retainer sleeve 27. Details of the overhead valve 30 and its surroundings are shown in the third diagram. The third figure shows that the operation trigger 5 is pulled from the initial state shown in the first figure and the second figure to start the top valve 30, whereby the air motor 50 starts to rotate, and the air chamber 26 is placed thereon. The state of the move. Relevant from its The action of the initial position is left to be described later.

Compression springs 31 to 31 are attached between the overhead valve 30 and the top case 2b. By the above-described compression springs 31 to 31, potential energy can be always applied to the overhead valve 30 toward the lower side (closed side). Further, the top valve upper chamber 30a on the upper side of the overhead valve 30 can be switched to a state in which the compressed air of the pressure accumulation chamber 7 acts via the trigger valve 4, and a state in which it is opened to the atmosphere without causing the compressed air to act. The switching of the air pressure action state of the upper chamber 30a of the overhead valve is performed by the operation of the trigger 5 and the action of the trigger valve 4.

Further, the lower portion of the overhead valve 30 is provided with a pressure receiving surface 30e and a pressure receiving surface 30f on the inner circumferential side which are inclined outward in the direction in which the thickness of the overhead valve 30 is thinned toward the entire circumference. The under-valve lower chamber 30d, which is located below the pressure receiving surface 30e on the outer peripheral side, often has compressed air flowing into the pressure accumulating chamber 7. Therefore, the air pressure of the compressed air often acts on the pressure receiving surface 30e. The compressed air pressure acting on the pressure receiving surface 30e acts in a direction in which the top valve 30 can be moved upward.

By the pulling operation of the trigger 5, the triggering valve 4 is actuated to discharge the compressed air in the upper chamber 30a of the overhead valve and open to the atmosphere. The biasing force of the compression springs 31 to 31 is set to be smaller than the pressure of the compressed air acting on the pressure receiving surface 30e of the overhead valve 30. Therefore, once the trigger valve 4 is actuated, the overhead valve 30 can be moved upward by the compressed air pressure acting on the pressure receiving surface 30e against the compression springs 31 to 31.

When the overhead valve 30 is moved up, the lower end thereof is separated from the upper surface of the valve seat portion 35. In the initial stage (semi-open state), the inner peripheral side ventilating chamber 30b communicates with the outer peripheral side overhead valve lower chamber 30d, and as a result, compressed air flows into the venting chamber 30b. The venting chamber 30b is in communication with the air motor 50 via the venting chamber 32. Therefore, the overhead valve 30 is opened. During the initial phase of initial opening, the air motor 50 will begin to rotate first. Details regarding the air motor 50 will be described later.

Since the compressed air that has flowed into the venting chamber 30b acts on the pressure receiving surface 30f on the inner peripheral side of the overhead valve 30, the overhead valve 30 is then moved up and fully opened. The state in which the overhead valve 30 has been fully opened is shown in the seventh diagram. Once the overhead valve 30 is fully opened, a seal ring 27a disposed on the outer periphery of the upper portion of the retaining sleeve 27 and the overhead valve 30 will open an air passage. Thus, the ventilating chamber 30c on the inner peripheral side of the overhead valve 30 will communicate with the venting chamber 30b, so that compressed air will flow into the venting chamber 30c. The compressed air that has flowed into the venting chamber 30c flows into the upper chamber 24 of the tubular portion through the flow rate switching valve 40 installed at the upper portion of the tubular portion 21. As such, once the compressed air flows into the upper chamber 24 of the barrel, the piston 22 will move downward. Once the piston 22 is moved down, the driver bit 23 is integrally moved down the piston 22 along its axial direction.

Once the screwdriver bit 23 is moved down, the tip end of the screwdriver bit 23 is engaged with the head of one screw S of the screw connection belt supplied from the magazine ,11, and the screw S is removed from the screw coupling belt, and then locked to the workpiece W. . The locking force of the driver bit 23 (the thrust of the piston 22) can be switched to the two-stage phase by switching the suction flow rate to the upper chamber 24 of the cylinder portion by the flow switching valve 40 described below.

The details of the flow switching valve 40 are also shown in the tenth to sixteenth views. The flow rate switching valve 40 includes a valve block seat portion 41 that can fix the upper end portion of the tubular portion 21 in a hermetically sealed state, a valve body portion 42, and a switching lever 43 that can change the relative positions of the two.

The valve seat portion 41 is fitted in an upper end portion of the cylindrical portion 21 that is expanded into a cup shape, and is airtightly sandwiched between the upper end portion of the cylindrical portion 21 and the top case 2b. between. Thereby, the valve seat portion 41 is fixed in a state in which it is not movable in the axial direction and is not rotatable about the shaft. The valve seat portion 41 has a moderate elasticity, and can restrict the upper end (top dead center) of the piston 22, and has a function as a damper (buffer body) for absorbing the impact when it is moved up. The valve seat portion 41 is provided with reference vent holes 41a to 41a penetrating in the thickness direction thereof. In the present embodiment, three reference vent holes 41a to 41a are disposed at the circumferential three-divided position (interval 120 ∘). As shown in the twelfth and fifteenth figures, each of the reference vent holes 41a has a fan-shaped opening, and the opening area thereof is large.

The valve body 42 and the valve seat portion 41 are positioned to face each other, and have a substantially circular plate shape, and a support shaft portion 42c is integrally provided at the center of the upper portion. The valve body 42 is supported by the top case 2b via the support shaft portion 42c, and is rotatable about its axis and is movable in parallel in a certain range in the axial direction. The support shaft portion 42c penetrates the top case 2b and protrudes into the recess 2c provided outside the top case 2b. The protruding portion is provided with a switching lever 43. The switching lever 43 is fixed to the tip end of the spindle portion 42c by means of a small screw 45. The position around the shaft portion 42c of the valve body 42 can be easily switched from the outside by the screwing operation of the switching lever 43. As shown in the tenth and thirteenth drawings, the concave portion 2c of the top case 2b is viewed from the rear (as viewed from above in the first figure) to form a fan shape of about 60 inches. The switching lever 43 is housed in a state in which the inside of the top case 2b is not exposed. Therefore, the switching lever 43 can perform the turning operation within a range of about 60 。. If the switching lever 43 is rotated within a range of about 60 Torr, the valve body 42 can be operated by rotation within a range of about 60 。.

Three large vent holes 42a and three small vent holes 42b are formed in the valve body 42 so as to penetrate in the thickness direction. Three large vents 42a are configured The circumferential direction is divided into three equal positions around the support shaft portion 42c. In the present embodiment, each of the large vent holes 42a is formed in a fan shape having the same size as the reference vent hole 41a on the valve seat portion 41 side. The three small vent holes 42b are also disposed at three positions in the circumferential direction around the fulcrum portion 42c. Each of the small vent holes 42b is disposed adjacent to the center between the two large vent holes 42a and 42a in the circumferential direction. Therefore, the three large vent holes 42a to 42a and the three small vent holes 42b to 42b are alternately arranged at intervals of 60 Å on substantially the same circumference. Therefore, once the switching lever 43 is rotated within a range of about 60 ,, the three reference vent holes 41a to 41a of the valve seat portion 41 can be switched to the state in which the large vent hole 42a has been aligned (tenth The state shown in Fig. 2), and the state in which the small vent hole 42b has completed the alignment (the state shown in Fig. 15).

The inner peripheral side of the overhead valve 30 is in a state where the large vent holes 42a to 42a have been aligned with respect to the reference vent holes 41a to 41a of the valve seat portion 41, and in a state where the small vent holes 42b to 42b have been aligned. The cross-sectional area of the flow path between the venting chamber 30c and the upper chamber 24 of the tubular portion is greatly different. Compared with the former, the latter has a smaller cross-sectional area. The former is the total cross-sectional area of the three large vent holes 42a to 42a (in the present embodiment, substantially equal to the total area of the three reference vent holes 41a to 41a), and the latter is the three small vent holes 42b. The total area of ~42b is the flow path cross-sectional area.

Therefore, the inflow amount of the compressed air flowing into the upper chamber 24 of the tubular portion per unit time is large, so that the thrust of the piston 22 is also large, and the locking force of the screw S is also large. As will be described later, in this case, when the base material W2 is a steel sheet (steel plate mode).

In contrast, the latter flows per unit time due to the small cross-sectional area of the flow path. The inflow of compressed air into the chamber 24 above the cylinder is small, and as a result, the thrust of the piston 22 is smaller than that of the former, so the locking force of the screw S is also small. In this case, it is suitable when the substrate W2 is a wooden board (wood board mode).

As described above, the screw locker 1 of the present embodiment has the flow switching valve 40 for adjusting the locking force of the screw S. The flow switching valve 40 can switch the inflow of compressed air to the chamber 24 above the cylinder portion in two stages, thereby performing lock cooperation with the most appropriate locking force in any case of so-called steel plate nailing and wood nailing. industry. The tenth figure shows that the switching lever 43 has been switched to the state of the steel plate mode suitable for the steel plate nailing, and the eleventh figure shows that the switching lever 43 has been switched to the state of the wood board mode suitable for the nailing of the wood board. .

The bottom of the recessed portion 2c is provided with position maintaining projections 2d, 2e for holding the switching levers 43 at the steel plate mode position and the wood plate mode position, respectively. Further, the valve body 42 can receive the potential energy in the direction of pushing against the valve seat portion 41 (below the figure) by the compression spring 44 attached between the top and the bottom case 2b. Therefore, the switching lever 43 integrally attached to the support shaft portion 42c of the valve body 42 can be formed by the biasing force of the compression spring 44 to form a potential energy that receives the direction in which the convex portion 2d, 2e is pressed toward the position of the concave portion 2c. . The biasing force of the compression spring 44 maintains the elastic engagement state of the switching lever 43 with respect to the position maintaining convex portions 2d, 2e, and imparts a moderate movement resistance. By imparting the above-described movement resistance, the switching lever 43 can be elastically held at each position to prevent accidental movement.

Next, the valve body 42 can receive the potential energy in the direction of pushing against the valve seat portion 41 by the compression spring 44 as described above. In the above-described steel plate mode, the three reference vent holes 41a to 41a of the valve seat portion 41 have been completed with the large vent holes 42a to 42a having substantially the same opening area. In alignment, when the piston 22 moves up, the compressed air pressure in the chamber 24 above the cylinder hardly acts on the valve body 42. Therefore, when the piston in the steel plate mode moves up, the valve body 42 is maintained in a state of being pressed against the upper surface of the valve seat portion 41, so that the compressed air flows into the upper chamber 24 of the cylinder portion and the exhaust gas from the chamber 24 above the cylinder portion. The flow is performed by a flow path in which the total area of the three reference vent holes 41a to 41a is the cross-sectional area.

On the other hand, in the wood board mode shown in the thirteenth to sixteenth drawings, the three reference vent holes 41a to 41a of the valve seat portion 41 have completed the small vent holes 42b to 42b having a small opening area. Counterpoint. Therefore, as shown in Fig. 15, in the reference vent holes 41a, the lower surface of the valve body 42 is exposed in the upper chamber 24 of the tubular portion. The exposed portion acts as a pressure receiving surface 42d that receives the compressed air pressure in the chamber 24 above the tubular portion when the piston moves up, so that the compressed air pressure in the upper chamber 24 of the cylinder portion acts on the valve body 42. At this time, the compressed air pressure in the upper chamber 24 of the cylinder portion acts in a direction in which the valve body 42 moves upward against the compression spring 44. The biasing force of the compression spring 44 is appropriately set to move the valve body 42 upward by the pressure of the compressed air in the chamber 24 above the cylinder when the piston 22 is moved up.

As shown in Fig. 16, once the valve body 42 is moved up against the compression spring 44, the valve body 42 is separated from the upper surface of the valve seat portion 41 to create a gap 42e therebetween. The upper portion 24 of the tubular portion communicates with the three large vent holes 42a to 42a outside the three small vent holes 42b to 42b of the valve body 42 via the gap 42e.

As described above, in the steel plate mode shown in the tenth to twelfth drawings, the reference vent holes 41a to 41a of the valve seat portion 41 are individually aligned with the large vent holes 42a of the valve body 42, so that the piston is moved downward. Every time When the suction flow rate of the valve body 42 is increased per unit time, a large locking force can be obtained, and when the piston moves up, the amount of exhaust gas from the upper chamber 24 of the cylinder portion per unit time can be ensured to be sufficient, thereby ensuring a relatively large amount of air. High exhaust efficiency and smoother movement above the piston 22.

On the other hand, in the wood board mode shown in the thirteenth to sixteenth drawings, the suction flow rate per unit time to the upper chamber 24 of the cylinder portion is small when the piston moves downward, and the utility model can be applied to the nailing of the wood board. A weaker lock. In addition, when the piston moves up, if the valve body 42 moves against the compression spring 44, the flow path cross-sectional area can be automatically enlarged to ensure high exhaust efficiency. Therefore, at this time, it is also ensured that the piston 22 moves smoothly.

The exhaust gas flows back to the ventilation chamber 30c on the inner peripheral side of the overhead valve 30 via the flow rate switching valve 40. At this time, the overhead valve 30 is moved downward to form a closed state with respect to the retaining sleeve 27, so that the breather chamber 30c is in a state of being hermetically sealed from the breather chamber 30b and the lower valve lower chamber 30d. Therefore, the exhaust gas is discharged to the exhaust chamber 30h on the outer peripheral side of the overhead valve 30 via the exhaust holes 30g to 30g provided in the overhead valve 30. The exhaust chamber 30h communicates with the exhaust chamber 8b via an exhaust passage (not shown), and thus communicates with the exhaust pipe 8 in the handle portion 3. The exhaust air (compressed air) flowing into the exhaust pipe 8 is discharged to the atmosphere through the exhaust port 8a.

Further, a plurality of exhaust holes 21a to 21a are provided in the peripheral wall of the upper portion side of the tubular portion 21. These vent holes 21a to 21a are hermetically sealed (check valve) in one direction (suction side) by the seal ring 28 provided on the outer peripheral side. Therefore, the exhaust of the chamber 24 above the cylinder portion when the piston is moved up can be performed by the above-described flow rate switching valve 40, or by the vent holes 21a to 21a. The compressed air discharged from the exhaust holes 21a to 21a flows into the ventilation chamber 30c in the same manner as the exhaust gas passing through the flow rate switching valve 40. After that, it is discharged to the exhaust chamber 30h through the exhaust holes 30g to 30g.

The exhaust of the lower chamber 25 of the tubular portion when the piston is moved downward is performed through a plurality of circulation holes 21b to 21b provided on the peripheral wall of the lower portion side of the tubular portion 21. The circulation holes 21b to 21b are open to the circulating air chamber 29 which is airtightly partitioned between the tubular portion 21 and the retaining sleeve 27. As will be described later, the compressed air may flow from the venting chamber 33 toward the circulating air chamber 29 through the circulation holes 21b to 21b while the magazine 11 is moved to the lower moving end (bottom dead center) and the air brake 26 is opened. The compressed air flowing into the circulating air chamber 29 is again circulated through the circulation hole 21b to the lower chamber 25 of the cylinder when it moves over the piston 22, and is used as a power for moving the piston 22 upward.

Second, the lower end position (bottom dead center) of the piston 22 is limited by the damper 26. Details of the construction of the damper 26 and its surroundings are shown in the fourth and ninth figures. The air lock 26 is an elastic body that hermetically seals the lower end portion of the tubular portion 21. In the present embodiment, the damper 26 is supported and can be displaced in a certain range toward the piston moving direction (upward and downward directions in the fourth drawing). The center of the air lock 26 is provided with an insertion hole 26a. Inside the insertion hole 26a, a screwdriver bit 23 is inserted to be in a state of being movable in the axial direction.

The air lock 26 includes a body portion 26b and a support shaft portion 26c extending downward from a center of a lower portion of the body portion 26b. The upper portion of the main body portion 26b is formed in a conical trapezoidal shape that is inclined in a direction in which the diameter thereof becomes smaller toward the upper side. By pressing the circumferential surface of the main body portion 26b toward the inclined surface 21c formed on the inner circumference of the lower opening portion of the tubular portion 21, the tubular lower chamber 25 can be hermetically sealed with respect to the ventilation chamber 33 to be described later.

The shaft portion 26c of the air lock 26 is fixed to the body casing 2a. The insertion hole 61a of the first frame body 61 is inserted into the support hole 60a of the second frame body 60 which is also fixed on the lower side of the main body casing 2a and supported by the support frame 60a, and is movable in the axial direction. status. The second frame body 60 supports the rotating shaft portion 51 on the upper side of the air motor 50, which will be described later, via the bearing 53, and is rotatably provided.

As shown in the ninth diagram, the damper 26 can absorb the impact at this time once the piston 22 is moved to the lower end position, and is displaced toward the lower side by the thrust of the piston 22. In the present embodiment, the position shifted to the lower side is set as the initial position of the air lock 26. As will be described later, the piston 22 is moved to the bottom dead center to displace the air lock 26 toward the lower side, so that the lower chamber 25 of the tubular portion communicates with the breath chamber 33. Thereby, compressed air can be supplied from the ventilation chamber 33 to the cylinder lower chamber 25, and can flow into the circulating air chamber 29 through the circulation hole 21b.

The lower surface of the main body portion 26b is provided with a convex portion 26d having a semicircular cross section around the entire circumference of the support shaft portion 26c. The upper surface 61b of the first frame body 61 is positioned below the convex portion 26d. As shown in the fourth figure, when the air lock 26 is displaced upward by the pulling operation of the trigger 5, the convex portion 26d is formed in a state of being separated from the upper surface 61b of the first frame 61. In this state, the ventilation chamber 33 on the outer peripheral side of the convex portion 26d communicates with the inside of the insertion hole 61a. As will be described later, the breather chamber 33 communicates with the breather chamber 30b on the inner peripheral side of the overhead valve via the breather chamber 32. Therefore, in the initial stage in which the overhead valve 30 is opened and started to be opened, compressed air is supplied to the inside of the ventilation chamber 33, so that the air lock 26 is supplied from the pressure accumulation chamber 7 toward the air motor 50 as the air lock 26 is moved upward from the initial position. The air is compressed and thereby the air motor 50 begins to rotate.

On the other hand, as shown in the ninth figure, once the air lock 26 is displaced toward the lower side, the convex portion 26d is formed to be pushed onto the upper surface 61b of the first frame body 61. status. In this state, as described above, the breather chamber 33 and the chamber lower chamber 25 are in communication with each other. Further, the ventilation chamber 33 is hermetically sealed with respect to the insertion hole 61a, the ventilation chamber 34, and the motor vent 52. As will be described later, in the closed state, the supply of compressed air from the accumulator chamber 7 to the air motor 50 is blocked without driving the air motor 50.

Secondly, the air motor 50 opens the overhead valve 30 with the pulling operation of the trigger 5, and starts to rotate in the initial stage in which it starts to start. The ventilating chamber 30b on the inner peripheral side of the lower portion of the overhead valve 30 communicates with the motor vent 52 of the air motor 50 via the venting chambers 32, 33, 34. Therefore, as shown in the third figure, the over-the-valve valve 30 will block the venting chamber 30b with respect to the accumulator chamber 7 in a closed state with respect to the valve pedestal portion 35. Therefore, compressed air is not supplied to the motor vent 52, so that the air motor 50 is not driven.

When the overhead valve upper chamber 30a is opened to the atmosphere by the pulling operation of the trigger 5 and the overhead valve 30 is started to be opened, the overhead valve lower chamber 30d on the outer peripheral side of the overhead valve 30 and the inner peripheral side ventilation chamber 30b is connected. Thereby, compressed air can be supplied to the ventilation chamber 30b. The supply of compressed air to the venting chamber 30b is moved up by the overhead valve 30 to create a gap between the seal ring 27a and the inner peripheral surface of the overhead valve 30, whereby the venting chamber 30b and the inner peripheral side of the overhead valve are provided. Before the venting chamber 30c is in communication, that is, before the compressed air is supplied to the venting chamber 30c to cause the piston 22 to start moving downward (the initial stage of starting the starting), that is, it has started. As described above, the ventilation chamber 30b communicates with the ventilation chamber 33 via the ventilation chamber 32. Therefore, when the compressed air is introduced into the ventilation chamber 30b, it will also flow into the ventilation chamber 33. The compressed air flowing into the venting chamber 33 acts to move the damper 26 that has been displaced downward. That is, in the initial state, the ventilation chamber 3 The compressed air of 3 will act on the outer side of the convex portion 26d on the outer side of the convex portion 26d in the direction in which it can be displaced upward. Therefore, during this phase, the damper 26 will move upward from its initial position. Once the air lock 26 is moved up, the airtight chamber between the lower chamber 25 and the air chamber 33 is hermetically blocked, and the air chamber 33 and the air chamber 34 are in communication. Therefore, the compressed air flowing into the venting chamber 30b is supplied to the air motor 50 via the venting chamber 34 and the motor vent 52, whereby the air motor 50 starts to rotate. That is, the air motor 50 starts to rotate after the overhead valve 30 starts to open.

The rotary shaft portion 51 of the air motor 50 has a drill insertion hole 51a having a circular cross section for the entire length thereof. The drill bit 23 is inserted into the drill insertion hole 51a to form a state in which it is relatively rotatable about the axis and relatively movable in the axial direction.

Further, since the air motor 50 itself is a so-called vane motor which has been known in the past, detailed descriptions of the structure and the like are omitted.

The rotating shaft portion 55 on the lower side of the air motor 50 is supported by the third frame 63 mounted on the tip end portion of the main body casing 2a, and is rotatable by the bearing 54. A pneumatic motor 50 is incorporated between the third frame body 63 and the second frame body 60.

The rotating shaft portion 55 on the lower side of the air motor 50 is coupled to the speed reducing mechanism portion 70. In the present embodiment, the speed reduction mechanism portion 70 uses a planetary gear mechanism. The sun gear 71 is attached to the rotating shaft portion 55. Two planetary gears 72, 72 are engaged in the sun gear 71. The two planetary gears 72, 72 are engaged with the internal gear 75 fixed to the main body casing 2a. The two planet gears 72, 72 are supported by brackets 73. The bracket 73 is supported by the front end of the body casing 2a via the bearing 74, and is The state of rotation.

The center of the bracket 73 penetrates along its central axis to form an insertion hole 73a for inserting the driver bit 23. The insertion hole 73a allows the driver bit 23 to be inserted, and is relatively movable in the axial direction, and is not rotatable relative to the axis, but is in an integrated state.

The inner circumference of the insertion hole 73a of the bracket 73 is viewed in cross section, and includes a pair of straight portions parallel to each other, and a portion of the straight portions connected to the partial arc-shaped portion (hereinafter abbreviated as an oblong shape). On the other hand, in the range of substantially half of the lower side in the axial direction of the bit bit 23, a flat portion 23a which is parallel to the long circular cross-sectional shape of the insertion hole 73a is provided in a long range along the row axial direction. 23a. The driver bit 23 is provided in the entire range in the axial direction, and the flat portions 23a and 23a are provided in a long range in the axial direction so that the flat portions 23a and 23a are often positioned in the insertion holes 73a. As described above, if the two planetary gears 72, 72 are often located in the insertion hole 73a of the bracket 73, the bracket 73 can be rotated around the axis of the bracket 73 to be integrated. The rotational torque of the air motor 50 output from the bracket 73 is transmitted to the driver bit 23.

As described above, the rotational output of the air motor 50 can be decelerated by the speed reduction mechanism portion 70 and transmitted to the driver bit 23. Here, the rotational torque of the air motor 50 and the speed reduction mechanism unit 70 can be transmitted to the driver bit 23 at the tip end side of the main body portion 2, that is, the portion closest to the lock portion of the screw S. Therefore, it is possible to effectively apply the rotational torque (screw torque) to the screw S without causing the twist of the bit bit 23 to occur as much as possible.

A cylindrical locking cylinder portion 13 is provided at a lower end of the body portion 2. The inner peripheral side of the lock cylinder portion 13 is adapted to rotate and reciprocate the drill bit 23 move. The screw coupling belt conveying mechanism 12 is connected to the intermediate position of the locking cylinder portion 13 in the longitudinal direction. By the screw coupling belt transport mechanism 12, the screw coupling belt can be intermittently fed at intervals, and the single screw S can be supplied to the lock cylinder portion 13 in conjunction with the screw S.

A holder 14 is attached to the tip end portion of the lock cylinder portion 13, and the holder 14 is provided with an elastic piece 14a for preventing damage to the workpiece W. The lock cylinder portion 13 can abut against the workpiece W via the holder 14, and in this state, the screw S is locked (locked) to the workpiece W.

In the screw locker 1 of the present embodiment having the above configuration, in the state where the compressed air is supplied to the pressure accumulation chamber 7, once the operation trigger 5 is pulled, the upper chamber upper chamber 30a can be opened toward the atmosphere, so that the upper chamber 30a can be opened toward the atmosphere. The overhead valve 30 is moved up. Once the overhead valve 30 is moved up, it will initially supply compressed air to the plenum 30b during the initial phase of its opening, which will flow into the plenum 33 through the plenum 32. Once compressed air is supplied to the plenum chamber 33, its pressure will cause the damper 26 to move upward from the initial position. Thereby, the chamber 25 below the cylinder can be closed, and the ventilation chamber 33 can be communicated with the ventilation chamber 34. Thus, by allowing the pressure accumulating chamber 7 to communicate with the venting chambers 30b, 32, 33, 34, compressed air can be supplied to the air motor 50, and thereby the air motor 50 starts to rotate. By the rotation of the air motor 50, the bit bit 23 can be rotated in the screwing direction.

Moreover, once the overhead valve 30 is fully opened, compressed air can be supplied to the ventilation chamber 30c via the ventilation chamber 30b. The compressed air can be supplied to the upper chamber 24 of the cylinder via the flow switching valve 40, whereby the piston 22 is moved downward. If the piston 22 moves down, the driver bit 23 will move down integrally. Therefore, the screwdriver bit 23 can be rotated in the screwing direction by the air motor 50, and moved downward by the piston 22 in the screw locking direction. Thereby, the lock cylinder can be supplied The single screw S in the portion 13 is locked to the workpiece W by the bit bit 23 and is locked.

During the downward movement of the piston 22, a portion of the compressed air of the chamber 25 below the cylinder portion is opened to the atmosphere via the insertion hole 26a or the like of the air lock 26 located around the driver bit 23. Next, the remaining portion flows into the circulating air chamber 29 through the circulation holes 21b to 21b to perform pressure accumulation. Therefore, the piston 22 will be able to flow down. By smoothly moving the piston 22 downward, the workpiece W can be locked to the workpiece W by the sub-bit 23 .

As shown in the ninth figure, when the piston 22 abuts against the air lock 26 and moves to the lower shift end (bottom dead center), the screw S is locked (locked). As shown, the piston 22 is moved to the lower shift end to elastically abut against the air lock 26 to absorb its impact. Further, the abutment of the piston 22 (the thrust of the piston 22) causes the air lock 26 to be displaced toward the lower side.

When the air lock 26 is displaced toward the lower side, the main body portion 26b is separated from the lower opening portion of the tubular portion 21, and as a result, a gap 26e is formed over the entire circumference between the air lock 26 and the inclined surface 21c. The lower portion 25 of the tubular portion communicates with the venting chamber 33 via the gap 26e. When the pulling operation of the trigger 5 is maintained, the state in which the compressed air is supplied to the breather chamber 33 can be maintained. Therefore, compressed air sufficient for the return of the piston can be supplied from the venting chamber 33 into the circulating air chamber 29 through the gap 26e, the lower chamber 25, and the circulation hole 21b.

Further, when the air brake 26 is displaced toward the lower initial position by the thrust of the piston 22, the convex portion 26d of the main body portion 26b is pressed against the upper surface of the first casing 61. Thus, the communication state between the breather chamber 33 and the breather chamber 34 can be blocked, so that the supply of compressed air to the motor port 52 can be blocked, thereby automatically stopping the rotation of the air motor 50. So even The state in which the operating trigger 5 has been pulled is maintained, and the time at which the piston 22 reaches the lower shift end and the stop time of the air motor 50 are also synchronized (substantially simultaneously). Therefore, it is possible to prevent the screw S of the workpiece W from being excessively locked.

Thereafter, once the user releases the pulling operation of the trigger 5, the compressed air is supplied to the overhead valve upper chamber 30a via the trigger valve 4, thereby moving the overhead valve 30 downward. Once the overhead valve 30 is moved downward and the lower end portion thereof is in airtight contact with the valve seat portion 35, the ventilation chamber 30c and the ventilation chamber 30b can be blocked by the sealing ring 27a, and the ventilation chamber 30b and the overhead valve can be blocked. Room 30d. Thus, the supply of compressed air to the chamber 24 above the barrel can be blocked. Once the supply of compressed air to the chamber 24 above the cylinder is blocked, the compressed air in the chamber 24 above the cylinder will pass through the flow switching valve 40, the exhaust holes 21a-21a, and the exhaust hole 30g of the overhead valve 30~ 30 g, the exhaust chamber 30h, and the exhaust pipe 8 are opened to the atmosphere (the thrust of the piston 22 is not moved downward).

In this manner, in addition to closing the overhead valve 30 to block the supply of compressed air to the upper chamber 24 of the tubular portion, the compressed air stored in the circulating air chamber 29 is once the upper portion 24 of the tubular portion is formed to be open to the atmosphere. The piston 22 will be returned to top dead center.

Further, in a state where the overhead valve 30 is closed, since the supply of compressed air to the ventilating chamber 33 is blocked, the damper 26 is maintained in a state of being displaced downward (the initial position of the damper 26).

Further, the screw locker 1 of the present embodiment can move the piston 22 to the lower shift end to abut against the air lock 26, that is, the thrust of the air lock 26 against the compressed air of the breath chamber 33 is lowered by the thrust thereof. Once the air lock 26 is moved downward, the convex portion 26d disposed under the abutment 26 abuts against the upper surface 61b of the first frame body 61, thereby blocking the air passage between the ventilation chamber 33 and the ventilation chamber 34. The air motor 50 is stopped. As described above, it is moved downward by the piston 22 of the body, and the air lock 26 as the passage blocking member is moved toward the closed side to stop the configuration of the air motor. The conventional technique is a structure in which the passage blocking member is moved toward the closed side by the compressed air having no body, and therefore there is a problem that the air motor stop time is inconsistent. This embodiment has no such problem, and can control the stop time of the air motor 50 with higher precision than in the past, and can improve the repeat accuracy of the time.

Further, the illustrated embodiment can supply the compressed air to the venting chambers 33, 34 by the pulling operation of the trigger 5, and the damper 26 can receive the compressed air by the venting chambers 33, 34 upward (the piston is moved upward). The potential energy. Therefore, after the abutment of the piston 22, the damper 26 can move downward toward the closed side against the biasing force of the compressed air of the venting chambers 33, 34. Therefore, after the piston 22 moves to the bottom dead center, the air motor 50 is stopped for a certain time. Thereby, even if the reaction force at the time of the lock is moved up by the main body 2, and the piston 22 is brought into contact with the air lock 26, the air motor 50 can be rotated for a certain time thereafter. Therefore, there will be no problem of incomplete locking. Therefore, the user does not need to push the body portion 2 with a large force in advance to avoid the reaction force when the screw is locked, so that the body portion 2 moves up. In this regard, the operability of the screw locker 1 can be improved.

Further, the air lock 26 has a function of restricting the bottom dead center function of the piston 22 and the impact function of the absorbing piston 22, and also has a function of opening and closing the air supply passage for the compressed air to the air motor 50 as an on-off valve. Therefore, the air lock 26 can further achieve high added value of the screw locker 1.

Moreover, once the air lock 26 is moved downward, a gap 26e is formed between the air lock 26 and the inclined surface 21c of the tubular portion 21, so the lower chamber 25 of the tubular portion It will communicate with the venting chamber 33 so that compressed air will flow from the venting chamber 33 into the lower chamber 25 of the tubular portion. This compressed air is utilized as a circulating air for moving the piston 22 upward. Therefore, in the screw-locking machine 1 of the present embodiment, the one-way valve for connecting the upper chamber 24 of the tubular portion and the circulating air chamber 29, which is conventionally provided on the lower side of the tubular portion, is omitted.

Further, as described above, after the piston 22 is moved to the bottom dead center to complete the locking of the screw S, the circulating air acts on the lower surface of the piston 22, and the air motor 50 is stopped. Therefore, it is possible to surely prevent the problem of the so-called shedding or the incomplete locking of the screw S.

Further, since the compressed air which is the venting chamber 33 which is a flow path for supplying the compressed air to the air motor 50 is configured as the circulating air for the piston to be moved, the conventional check valve and the circulating air chamber are basically unnecessary. In the present embodiment, the arrangement of the circulating air chamber 29 and the circulation holes 21b to 21b is an auxiliary property.

Further, since the screw locker 1 is configured to use the air brake 26 of a single member as the flow rate switching valve, it is possible to maintain a simple structure and perform a precise screw-locking operation (no error operation).

Various modifications can be added to the above-described embodiments. In the above embodiment, the damper 26 is subjected to the biasing force of the compressed air of the ventilating chambers 33, 34, and is subjected to the potential energy toward the upper moving side (starting side) of the piston. However, as an example, although the illustration has been omitted, a compression spring may be attached around the support shaft portion 26c, that is, between the main body portion 26b and the lower surface and the upper surface 61b of the first frame body 61. Thereby, in addition to the biasing force of the compressed air, the damper 26 can be biased toward the upper side of the piston by the biasing force of the compression spring. At this time, it is preferable to change the force of the above-mentioned compression spring by an operation from the outside, whereby the force of the air brake 26 and the thrust of the piston 22 can be matched. The adjustment can be arbitrarily adjusted, and the added value of the screw locker 1 can be further improved.

Further, the passage blocking member that moves in accordance with the movement of the piston 22 and opens and closes the air passage to the air motor 50 has been constructed using the damper 26. However, a separate member other than the air lock may be used as the passage blocking member having the opening and closing function of the air passage.

Further, in the above embodiment, although the air lock 26 is exemplified as the flow rate switching valve, another member different from the air lock 26 may be separately provided as the flow rate switching valve, and when the piston is moved to the bottom dead center, The other members move so that the compressed air for the air motor 50 acts below the piston 22. Further, at this time, the flow path for supplying the compressed air to the air motor 50 may be blocked by using other members. That is, in the illustrated embodiment, the opening operation of the lower chamber 25 of the cylinder portion to the venting chamber 33 and the blocking operation of the compressed air to the air motor 50 can be performed substantially simultaneously by the movement of the damper 26 of a single member. However, if the piston 22 is moved to the bottom dead center, the two actions need not be performed simultaneously.

Further, the present invention may be configured to separately apply a potential energy to the upward movement side of the air lock 26 by using a compression spring. At this time, the convex portion 26d can be omitted, and the pressure of the ventilating chamber 33 is not required to act on the lower side of the damper 26 to shift the damper 26 from the initial position.

However, the above description is only a detailed description of the preferred embodiments of the present invention, and the present invention is not limited thereto, and is not intended to limit the present invention. The scope of the patent application is subject to the scope of the present invention, and any one skilled in the art can easily include it in the field of the present invention. Think about changes or modifications Covered in the following patent scope of this case.

1‧‧‧ screw lock machine

2‧‧‧ Body Department

2a‧‧‧ body shell

2b‧‧‧ top shell

2c‧‧‧ recess

2d‧‧‧ Position retaining convex part (for steel plate mode)

2e‧‧‧ Position retention convex (for wood board mode)

3‧‧‧Handle

4‧‧‧trigger valve

5‧‧‧ Trigger

6‧‧‧Air hose

7‧‧‧Accumulation room

8‧‧‧Exhaust pipe

8a‧‧‧Exhaust port

8b‧‧‧Exhaust room

11‧‧‧ Cangjie

12‧‧‧ Screw connection belt conveying mechanism

13‧‧‧Locked tube

14‧‧‧Support

14a‧‧‧Elastic film

20‧‧‧Combat Department

21‧‧‧ Tube

21a‧‧‧ venting holes

21b‧‧‧Circular hole

21c‧‧‧ sloped surface

22‧‧‧Piston

23‧‧‧drive bit

23a‧‧‧Flat Department

24‧‧‧The upper chamber of the tube

25‧‧‧The lower chamber of the tube

26‧‧‧ Airlock (bottom dead side)

26a‧‧‧ Inserting through holes

26b‧‧‧ Body Department

26c‧‧‧ shaft part

26d‧‧‧ convex

26e‧‧‧ gap

27‧‧‧ Keep the set

27a‧‧‧Seal

28‧‧‧Seal

29‧‧‧Circular air chamber

30‧‧‧Overhead valve

30a‧‧‧Overhead valve upper chamber

30b‧‧‧ Ventilation room

30c‧‧ ́s ventilation room

30d overhead valve lower chamber

30e‧‧‧pressure surface (outer side)

30f‧‧‧pressure surface (inner side)

30g‧‧‧ venting holes

30h‧‧‧Exhaust room

31‧‧‧Compressed spring

32‧‧‧ Ventilation room

33‧‧‧ Ventilation room

34‧‧‧ Ventilation room

35‧‧‧Valve seat

40‧‧‧Flow switching valve

41‧‧‧Valve seat

41a‧‧‧Base Vent

42‧‧‧ valve body

42a‧‧‧ large vent

42b‧‧‧Small vent

42c‧‧‧ shaft part

42d‧‧‧pressured surface

42e‧‧‧ gap

43‧‧‧Switching the handle

44‧‧‧Compressed spring

45‧‧‧Small screws

50‧‧‧Air motor

51‧‧‧Rotary shaft

51a‧‧‧Drill insertion hole

52‧‧‧ motor vent

53‧‧‧Rotary shaft

54‧‧‧ bearing

55‧‧‧Rotary shaft

60‧‧‧ second frame

60a‧‧‧Support hole

61‧‧‧ first frame

61a‧‧‧ inserted through hole

61b‧‧‧above

63‧‧‧ third frame

70‧‧‧Deceleration Mechanism Department

71‧‧‧Sun Gear

72‧‧‧ planetary gear

73‧‧‧ bracket

73a‧‧‧ inserted through hole

74‧‧‧ Bearing

75‧‧‧Internal gear

S‧‧‧ screws

W‧‧‧Workpiece

W1‧‧‧Upper material (gypsum board)

W2‧‧‧ substrate (steel or wood)

The first drawing is a longitudinal sectional view of the entire screw locker according to an embodiment of the present invention. This figure shows its initial state.

The second drawing is a longitudinal sectional view of the body portion of the lock machine of the embodiment. This figure shows the initial state of the body section.

The third drawing is a partial enlarged view of the second figure, and is a longitudinal sectional view of the top valve and the periphery of the upper portion of the cylinder. This figure is the same as the second figure, and shows the fully closed state of the overhead valve in the initial state of the main body portion.

The fourth figure is a longitudinal section of the lower part of the cylinder and the periphery of the air lock. This figure shows the phase in which the air brake moves up from the initial position on the lower side and the air motor starts to rotate.

The fifth drawing is a longitudinal sectional view of the body portion of the screw locker of the embodiment. This figure shows the half-open state of the overhead valve, which is the phase at which the air motor starts to rotate. During this phase, the piston is still at top dead center.

Fig. 6 is a longitudinal sectional view showing the body portion of the screw locker of the embodiment. This figure shows the fully open state of the overhead valve, ie the phase at which the air motor rotates and the piston begins to move down.

The seventh drawing is a partial enlarged view of the sixth figure, that is, a longitudinal section of the top valve and the upper periphery of the cylinder which have been fully opened. This figure shows that the overhead valve is fully open and the piston begins to move down.

The eighth drawing is a longitudinal sectional view of the body portion of the screw locker of the embodiment. This figure shows that the piston is moved to the bottom dead center, and as a result, the air motor is stopped and the screw is locked.

The ninth figure is a partial enlarged view of the eighth figure, that is, an enlarged view of the piston and the periphery of the air brake that has been moved to the bottom dead center. This figure shows that the air brake is pushed down by the piston. As a result, the state in which the air passage used by the air motor is closed is formed.

The tenth figure is a rear view obtained by observing the body portion from the arrow (10) direction of the first figure. This figure shows the state in which the switching lever has been switched to the position of the steel plate in which the steel plate is fixed.

The eleventh figure is a cross-sectional view of the (11)-(11) line in the tenth figure. This figure shows the longitudinal section of the internal structure around the overhead valve.

The twelfth figure is a cross-sectional view of the line (12)-(12) in the eleventh figure. This figure shows the cross section of the valve seat and the overhead valve of the switching valve.

The thirteenth picture is a rear view of the body portion. This figure shows the state in which the switching lever has been switched to the position of the board mode for the board nailing.

Figure 14 is a cross-sectional view of the (14)-(14) line in the thirteenth figure. This figure shows the cross section of the valve seat and the overhead valve of the switching valve.

The fifteenth figure is a cross-sectional view of the line (15)-(15) in the fourteenth figure. This figure shows the cross section of the valve seat and the overhead valve of the switching valve.

The sixteenth figure is a longitudinal section of the upper portion of the body portion, that is, the periphery of the flow switching valve. This figure shows the flow switching valve when the piston moves up. The valve body moves against the compression spring and moves up to the valve seat. As a result, a gap is formed between the valve seat and the valve body, and the state can be exhausted through the gap.

1‧‧‧ screw lock machine

2‧‧‧ Body Department

2a‧‧‧ body shell

2b‧‧‧ top shell

3‧‧‧Handle

4‧‧‧trigger valve

5‧‧‧ Trigger

6‧‧‧Air hose

7‧‧‧Accumulation room

8‧‧‧Exhaust pipe

8a‧‧‧Exhaust port

8b‧‧‧Exhaust room

11‧‧‧ Cangjie

12‧‧‧ Screw connection belt conveying mechanism

13‧‧‧Locked tube

14‧‧‧Support

20‧‧‧Combat Department

21‧‧‧ Tube

22‧‧‧Piston

23‧‧‧drive bit

23a‧‧‧Flat Department

25‧‧‧The lower chamber of the tube

26‧‧‧ Airlock (bottom dead side)

26a‧‧‧ Inserting through holes

27‧‧‧ Keep the set

27a‧‧‧Seal

30‧‧‧Overhead valve

30a‧‧‧Overhead valve upper chamber

30b‧‧‧ Ventilation room

30c‧‧ ́s ventilation room

31‧‧‧Compressed spring

32‧‧‧ Ventilation room

33‧‧‧ Ventilation room

34‧‧‧ Ventilation room

35‧‧‧Valve seat

40‧‧‧Flow switching valve

43‧‧‧Switching the handle

50‧‧‧Air motor

51‧‧‧Rotary shaft

52‧‧‧ motor vent

53‧‧‧Rotary shaft

54‧‧‧ bearing

55‧‧‧Rotary shaft

60‧‧‧ second frame

61‧‧‧ first frame

63‧‧‧ third frame

70‧‧‧Deceleration Mechanism Department

71‧‧‧Sun Gear

72‧‧‧ planetary gear

73‧‧‧ bracket

73a‧‧‧ inserted through hole

74‧‧‧ Bearing

W‧‧‧Workpiece

W1‧‧‧Upper material (gypsum board)

W2‧‧‧ substrate (steel or wood)

Claims (15)

A screw locking machine comprising: a pneumatic motor for rotating a screwdriver bit for locking a screw in a screwing direction; a piston for moving the aforementioned bit to a screw locking direction; and an air supply passage for supplying a compressed air for driving the air motor; and a passage blocking device for allowing or blocking the supply of compressed air to the air motor via the air supply passage; wherein the passage blocking device moves to the lower end by using the piston As a driving force for blocking. The screw-locking machine according to claim 1, wherein the passage blocking device has a passage blocking member that is configured to be movable in a moving direction of the piston, and the passage blocking member is movable to the piston Move the lower end and move in the downward direction by the aforementioned piston. The screw-locking machine of claim 2, wherein the passage blocking member receives a potential energy in an upward direction of the piston at least before the piston moves to the lower end. The screw-locking machine of claim 2, wherein the passage blocking member is for restricting an air lock of a position of a lower end of the piston. The screw-locking machine of claim 4, wherein the air brake is subjected to a compressive air and/or a potential imparted by a spring toward the upward movement of the piston. A screw lock machine comprising: The air motor can rotate the screwdriver bit for locking the screw toward the screwing direction; the piston can move the aforementioned bit to the screw locking direction; the air supply passage can supply the compressed air for driving the air motor; and The compressed air supply device can supply the compressed air from the air supply passage toward the lower side of the piston to move the piston upward when the piston moves to the lower end. The screw-locking machine according to claim 6, wherein the compressed air supply device has a flow switching valve, and the connecting object of the air supply passage is switched when the piston moves to the lower moving end, and the flow is switched. The action of the valve stops supplying compressed air to the aforementioned air motor while supplying compressed air to the lower side of the piston. The screw-locking machine of claim 7, wherein the flow switching valve comprises an air lock for restricting a downward movement of the piston. The screw-locking machine of claim 8, wherein the air brake is configured to move up and down along a lower end portion of the tubular portion for receiving the piston, and to move up and down along a moving direction of the screwdriver bit, When the air brake is moved upward, the lower end portion of the tubular portion is sealed by the air lock, and the air supply passage for supplying the compressed air to the air motor is connected to the air motor, and the piston is moved once. At the lower end, the air brake is moved downward by the thrust of the piston, and the air supply passage for supplying compressed air to the air motor is closed to the air motor, and the air supply passage is in communication with the lower side of the piston. The screw-locking machine according to claim 9, wherein the moving of the air damper causes the compressed air of the air supply passage to act on the lower side of the air lock, and the potential energy is applied to the upward movement side of the air lock. . The screw-locking machine according to any one of claims 1 to 10, wherein the air supply passage includes a ventilation chamber located below the piston when the piston is located at a lower moving end. The screw-locking machine according to any one of claims 1 to 10, wherein the air motor receives the supply of compressed air from the air supply passage before the piston has moved to the lower shift end. A screw locking machine comprising: a pneumatic motor for rotating a screwdriver bit for locking a screw in a screwing direction; a piston for moving the aforementioned bit to a screw locking direction; and an air supply passage for supplying a compressed air for driving the air motor; and a control device disposed in the air supply passage to control at least a part of the operation of the piston or the air motor; wherein the control device uses the action of the piston to move to the lower end Driving force. The screw-locking machine of claim 13, wherein the control device is adapted to block and block passage of compressed air through the air supply passage to the air passage of the air motor. The screw-locking machine according to claim 13, wherein the control device is configured to supply compressed air from the air supply passage toward the lower side of the piston when the piston is moved to the lower moving end, and move the piston upward. It Compressed air supply unit.