JP2014231133A - Driving machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving machine which can be manufactured at low cost and can stabilize a driving depth of a stopper. The driving machine 1 includes a housing 2, a nose portion 6, a magazine 7, and the like. It is arranged in the housing 2 so as to be reciprocally movable, has a flange portion 41 and a support portion 43, and is supported by a driver 4 that strikes a stopper and a support portion 43 so as to be reciprocally movable. It includes a striker 5 that hits 41 and a bumper 36 that absorbs the impact from the driver 4. [Selection diagram] Fig. 1

Description

  The present invention relates to a driving machine.

  2. Description of the Related Art Conventionally, a driving machine that hits a stopper such as a nail or a stapler using a compressed air, an urging member or combustion gas energy as a power source is known (FIG. 10). Such a nailing machine 101 incorporates a driver 104 for hitting a stopper (not shown) in a housing 102 so as to be slidable. By operating the trigger 112, the compressed air presses the driver 104, and the stopper supplied from the magazine 107 to the nose portion 106 is driven into a not-shown workpiece.

  The ideal striking in such a driving machine is a state in which the head of the stopper is flush with the surface of the material to be driven, or is slightly indented into the material to be driven. In order to realize such a state, the supply pressure of compressed air is adjusted, or the movable range of the push lever 113 at the tip of the driving machine is adjusted. However, if the material to be driven is wood, the hardness varies partially due to the density of the nodes and annual rings, etc., so that the fixed tool cannot be driven completely with a certain adjustment, or conversely, it will be driven too much. There was a problem.

  In order to solve the above problems, a method has been proposed in which an impact sensor installed in a driving machine body detects a reaction of the body and automatically adjusts the driving depth by controlling a supply pressure through arithmetic processing. (For example, refer to Patent Document 1).

JP-A-62-74580

  However, the time from when the leading end of the fastener comes into contact with the workpiece to be driven until the entire stopper is driven into the workpiece is only about 1 ms. With the configuration as in Patent Document 1, air is compressible. Since it is a fluid, it is difficult to follow even if the supply pressure is controlled in this short time. Furthermore, it is expensive because of the sensor and the arithmetic unit, and a drive power source for that purpose must be newly prepared, and it is very difficult to realize a high cost and extremely difficult to adjust the driving depth automatically. Therefore, an object of this invention is to provide the driving machine which can be manufactured cheaply and can stabilize the driving depth of a fastener.

  In order to solve the above-described problems, the present invention provides a housing, a nose portion in which an injection passage for injecting a stopper is formed, a magazine for supplying the stopper to the nose portion, and a reciprocating motion in the housing. A driver having a flange portion having a diameter expanded in a direction perpendicular to the reciprocating direction, and a driver for striking the stopper supplied from the magazine to the injection passage, and the reciprocating direction with respect to the driver And a striker that strikes the flange portion and is provided so as to be relatively movable by a predetermined amount.

  According to such a configuration, after the driver strikes the stopper, the striker strikes the flange portion and strikes the stopper twice, so that the striking energy can be subdivided. As a result, the material to be driven is hard, and if the stopper is not sufficiently driven into the material to be driven by one hit, it can be surely driven by the second hit. Moreover, the impact on the operator's handle when driving the stopper can be reduced by offsetting the recoil generated in the housing immediately after the driver hits the stopper by striking the flange with the striker. it can.

  In the driving machine configured as described above, a bumper positioned below the flange portion and capable of contacting the flange portion is further provided, the driver moves to the nose portion side, and a lower end of the driver and a lower end of the injection passage It is preferable that the flange portion and the bumper come into contact with each other when they are close to each other in the reciprocating direction.

  According to such a configuration, when the driven material is soft and the stopper is driven in or near the surface of the driven material by the first impact, the lower end of the driver and the lower end of the injection passage are In the reciprocating direction, the head is substantially coincident (the head of the stopper is substantially flush with the surface of the material to be driven), and the flange portion and the bumper are in contact with each other. The striking force is absorbed by the bumper, and the stopper is not excessively driven into the material to be driven. Thereby, without using a sensor or an arithmetic unit, the driving depth of the stopper can be stabilized at a low cost, and the stopper can be concentrated on the surface of the driven material or in the vicinity thereof.

  Further, it is preferable that the striker strikes the flange portion in accordance with a decrease in the moving speed of the driver in the reciprocating direction after the driver strikes the stopper.

  According to such a configuration, when the hitting speed of the driver is reduced, the striker hits the flange portion, and an additional hitting force for hitting the stopper can be given to the driver.

  Further, it is preferable that the striker strikes the flange portion in accordance with a repulsive force received from the stopper by the driver striking the stopper.

  According to such a configuration, when the driver receives a repulsive force from the stopper, the repulsive force can be offset by striking the flange portion with the striker, and it is applied to the operator's handle when the stopper is driven. Impact can be mitigated.

  The said structure WHEREIN: It is preferable to provide further the urging member which is provided between this flange part and this striker, and urges | biases this striker in the direction in which this flange part and this striker leave | separate mutually.

  According to such a configuration, a constant gap can be formed between the flange portion and the striker by the urging member. Thereby, it can prevent that a flange part and a striker closely_contact | adhere, and can move to a reciprocating direction, and can give a hit | damage to a stopper reliably 2nd time.

  The driver further includes a stopper portion that restricts movement of the striker in a direction away from the driver, and a buffer member is provided between the stopper portion and the striker in the reciprocating direction. Preferably it is.

  According to such a configuration, the impact when the striker collides with the stopper portion can be mitigated by the reaction after the striker strikes the flange portion. Thereby, the impact applied to the operator's handle immediately after driving the stopper can be reduced.

  In the above configuration, a pressure accumulating chamber that is defined in the housing and stores compressed air, a cylinder that is accommodated in the housing, extends in the reciprocating direction, and supports the driver slidably in the reciprocating direction; A main valve that is housed in the housing and controls the flow of the compressed air from the pressure accumulating chamber into the cylinder, and the cylinder upper chamber is defined by the flange portion, the cylinder, and the main valve. It is preferable that it is formed.

  According to such a structure, a stop can be hit | damaged using compressed air as a motive power source of a driver.

  In the above configuration, a pressure accumulating chamber that is defined in the housing and stores compressed air, a cylinder that is accommodated in the housing, extends in the reciprocating direction, and supports the striker slidably in the reciprocating direction; A main valve housed in the housing and controlling the flow of the compressed air from the pressure accumulating chamber into the cylinder, and the cylinder upper chamber is defined by the striker, the cylinder, and the main valve. It is preferable that

  According to such a configuration, the stopper can be hit using compressed air as a power source for the striker.

  According to the driving machine of the present invention, it is possible to concentrate the driving depth of the stopper on the driven material in the vicinity of the same surface.

The fragmentary sectional view which shows the driving machine by the 1st Embodiment of this invention. FIG. 3 is an enlarged partial cross-sectional view of the driver and striker of the driving machine according to the first embodiment of the present invention. The fragmentary sectional view which shows the moment when the main valve of the driving machine by the 1st Embodiment of this invention was opened. The fragmentary sectional view which shows the middle of the driver of the driving machine by the 1st Embodiment of this invention driving the nail into the to-be-driven material. The fragmentary sectional view which shows the state (1st strike) which the driver of the driving machine by the 1st Embodiment of this invention hit | damaged the stop. FIG. 3 is a partial cross-sectional view showing a state where the striker of the driving machine according to the first embodiment of the present invention hits the driver and the nail head is driven substantially flush with the surface of the driven material. The graph which represented typically the relationship between the striking force and time by the 1st impact of the driving machine by the 1st Embodiment of this invention, and the 2nd impact, and time. The fragmentary sectional view which shows the driving machine by the 2nd Embodiment of this invention. The enlarged fragmentary sectional view of the driver and striker of the driving machine by the 2nd Embodiment of this invention. The fragmentary sectional view which shows the conventional driving machine.

  A driving machine according to a first embodiment of the present invention will be described with reference to FIGS. A nail driver 1 as a driving machine shown in FIG. 1 is a tool for driving a nail 71 as a stopper into a material to be driven W, and uses compressed air as a power source.

  As shown in FIG. 1, the nail driver 1 includes a housing 2, a handle 2 </ b> A located on one side of the housing 2, a cylinder 3 housed in the housing 2, and a top dead center housed in the cylinder 3. A driver 4 slidable between the bottom dead center, a striker 5 slidably supported by the driver 4 for striking the driver 4, a nose portion 6 connected to the housing 2, and a rear of the nose portion The magazine 7 is configured to supply the nail 71 to the nose portion 6, and the head bumper 8 can contact the driver 4. For convenience of explanation, in FIGS. 1 to 7, the direction in which the handle 2A extends from the housing 2 is defined as the rear direction, and the reverse is defined as the front direction. A direction in which the nose portion 6 extends from the housing 2 is defined as a downward direction, and the opposite direction is defined as an upward direction. Further, a direction orthogonal to the front-rear direction and the up-down direction is defined as the left-right direction (the front side in FIG. 1 is the left direction, and the reverse is the right direction).

  A connecting portion 2B to which an air hose (not shown) connected to a compressor (not shown) is connected is provided at the rear end of the handle 2A. A pressure accumulating chamber 2 a for storing compressed air supplied from the compressor is formed in the handle 2 </ b> A and the housing 2 of the nailing machine 1.

  At the base of the handle 2A, a trigger 12 that is operated by an operator, extends from the lower end of the nose portion 6 to the vicinity of the trigger 12 and is urged from the housing 2 toward the nose portion 6 and vertically along the nose portion 6 A movable push lever 13, a trigger valve portion 14 that is a switching valve that communicates with a main valve 31 described later to send and exhaust compressed air, and a plunger 15 that transmits the operation of the trigger 12 to the trigger valve portion 14 are provided. It has been.

  As is well known, the plunger 15 of the trigger valve portion 14 is pushed up when both the pulling operation of the trigger 12 and the pressing operation of the push lever 13 against the workpiece W are performed.

  The cylinder 3 has a substantially cylindrical shape, and a return air chamber 3a for storing compressed air for returning the driver 4 to the top dead center is formed on the outer side of the cylinder 3 in the radial direction. The cylinder 3 includes a check valve 3A capable of only venting from the inside of the cylinder 3 to the return air chamber 3a, and an air passage below the check valve 3A and constantly communicating the inside of the cylinder 3 and the return air chamber 3a. 3b is formed. The inside of the cylinder 3 is divided into a cylinder upper chamber 45 and a cylinder lower chamber 46 by a flange portion 41 described later (FIG. 4). For convenience of explanation, in FIGS. 1 to 7, the direction from the central axis of the cylinder 3 toward the outer periphery of the cylinder 3 is defined as a radial direction.

  A main valve 31 that communicates and blocks the pressure accumulating chamber 2 a and the inside of the cylinder 3, a main valve spring 32 that biases the main valve 31 upward, and a main valve spring 32 are disposed radially outward of the upper portion of the cylinder 3. A main valve chamber 33 for housing and a main valve plate 34 are provided.

  The main valve 31 has a substantially cylindrical shape, and in the initial state (FIG. 1), the upper end portion of the main valve 31 contacts the housing 2 and the inner peripheral portion of the upper end of the main valve 31 contacts the head bumper 8. ing. At this time, the main valve 31 shuts off the pressure accumulating chamber 2a and the inside of the cylinder 3.

  An expansion chamber 35 is formed outside the main valve 31 in the radial direction. In the expansion chamber 35, a plurality of exhaust ports 35a communicating with the outside are formed. The compressed air in the cylinder upper chamber 45 is discharged to the outside through the expansion chamber 35. The compressed air in the cylinder upper chamber 45 is gradually brought close to the atmospheric pressure through the expansion chamber 35, thereby reducing noise when the compressed air is discharged.

  A bumper 36 for absorbing surplus energy of the driver 4 is provided at the lower portion of the cylinder 3. The bumper 36 is an elastic body made of urethane or nitrile rubber (NBR). Specifically, the bumper 36 is provided below the flange portion 41 described later, that is, on the nose portion 6 side in the reciprocating direction with respect to the flange portion 41.

  As shown in FIGS. 2A and 2B, the driver 4 is made of metal, and includes a flange portion 41 that is in sliding contact with the inner peripheral surface of the cylinder 3, a blade portion 42 that strikes a stopper, and a striker 5. It comprises a support portion 43 that is slidably supported in the reciprocating direction (vertical direction in FIG. 1), and a stopper portion 44 that prevents the striker 5 from coming off. A spring 9 is provided between the striker 5 supported by the support portion 43 and the flange portion 41, and the spring 9 biases the striker 5 in a direction away from the flange portion 41. The spring 9 corresponds to the biasing member of the present invention.

  The flange portion 41 has a substantially disc shape, and a cylinder sliding contact surface 41A that is in sliding contact with the inner peripheral surface of the cylinder 3 is defined on the outer peripheral surface thereof, and an O-ring 41B is provided on the cylinder sliding contact surface 41A. ing. The O-ring 41B blocks the cylinder upper chamber 45 and the cylinder lower chamber 46. A face to be hit 41D that receives a hit from the striker 5 is defined on the surface of the flange portion 41 that faces the striker 5. A groove 41a is formed on the inner side in the radial direction of the hit surface 41D. The support portion 43 extends further upward from the radially inner side of the groove portion 41a. A bumper contact surface 41C capable of contacting the bumper 36 is defined on the surface opposite to the hit surface 41D with respect to the O-ring 41B. The blade portion 42 extends downward from the radially inner side of the bumper contact surface 41C.

  The blade portion 42 is formed integrally with the flange portion 41, extends downward from the flange portion 41, and drives the nail 71 into the driven material W at the lower end of the blade portion 42. The length (vertical length) of the blade portion 42 is configured to be substantially equal to the distance from the upper end of the bumper 36 to the surface of the workpiece W, and when the driver 4 is located at the bottom dead center. The flange portion 41 and the bumper 36 are in contact with each other, and the lower end of the blade portion 42 and the lower end of the injection passage 6a coincide with each other in the reciprocating direction (vertical direction).

  The support portion 43 is formed integrally with the flange portion 41, has a substantially cylindrical shape extending upward from the flange portion 41 and extending in the vertical direction. A screw part 43A having a thread that can be screwed with the stopper part 44 is provided on the outer periphery of the upper part of the support part 43, and the striker 5 is slidably supported in the reciprocating direction on the outer periphery of the lower part of the screw part 43A. A striker sliding contact surface 43B is defined.

  The stopper portion 44 has a substantially disc shape, and a screw hole 44a screwed with the screwing portion 43A is formed at the center thereof. Since the diameter of the stopper portion 44 is larger than the diameter of the support portion 43, the screw hole 44a and the screwing portion 43A are screwed together to prevent the striker 5 from coming off and at the same time the vertical direction of the driver 4 The kinetic energy is given to the striker 5 according to the movement of. A buffer member 44 </ b> A is provided on the surface of the stopper portion 44 that faces the striker 5 to relieve an impact when the striker 5 and the stopper portion 44 collide with each other. The buffer member 44A is an elastic body made of urethane or nitrile rubber (NBR).

  The striker 5 is made of metal and has a substantially disk shape, and the diameter thereof is smaller than the diameter of the cylinder 3. An insertion hole 5a that penetrates in the reciprocating direction and is inserted through the support portion 43 is formed at the center of the striker 5 in the radial direction. The striker 5 is slidably supported by the support 43 by inserting the support 43 into the insertion hole 5a. Since the inner diameter of the insertion hole 5a is slightly larger than the outer diameter of the support portion 43, the inner peripheral surface of the insertion hole 5a slides on the striker sliding contact surface 43B. On the upper surface of the striker 5, a buffer member contact surface 5A that can contact the buffer member 44A is defined. On the lower surface of the striker 5, a striking surface 5B that strikes the striking surface 41D of the flange portion 41 is defined, and a spring that abuts the upper end portion of the concave spring 9 upwards inward in the radial direction of the striking surface 5B. A contact groove 5b is formed.

  The nose portion 6 is formed with an injection passage 6a for guiding the blade portion 42 and injecting the nail 71. An injection hole 6b through which the nail 71 is injected is defined at the lowermost position of the injection passage 6a.

  The magazine 7 is provided behind the nose portion 6, and a nail feeder (not shown) that feeds the nails 71 sequentially to the nose portion 6 is provided inside the unillustrated interior.

  The head bumper 8 is fixed to an upper end portion inside the housing 2 and includes a contact portion that protrudes downward and can contact the driver 4. The contact portion is in contact with the upper surface of the stopper portion 44 in the initial state. .

  Next, the operation of the nailing machine 1 will be described.

  In the initial state shown in FIG. 1, the driver 4 is located at the top dead center, and the stopper portion 44 is in contact with the head bumper 8. The main valve 31 blocks communication between the cylinder upper chamber 45 and the pressure accumulating chamber 2a. The main valve chamber 33 communicates with the pressure accumulation chamber 2a. The main valve chamber 33 is filled with compressed air, and the main valve 31 is biased upward by the compressed air. The cylinder upper chamber 45 communicates with the expansion chamber 35 and is at atmospheric pressure.

  As shown in FIG. 3, when the operator pulls the trigger 12 in a state where the push lever 13 is pressed against the workpiece W, the operation of the trigger valve unit 14 causes the main valve chamber 33 to communicate with the outside, and the main valve The chamber 33 is at atmospheric pressure. As a result, the force by which the compressed air stored in the pressure accumulating chamber 2a pushes down the main valve 31 is greater than the force by which the main valve spring 32 pushes the main valve 31 upward. Move to.

  As the main valve 31 moves downward, the cylinder upper chamber 45 communicates with the pressure accumulating chamber 2a. At the same time, the communication between the cylinder upper chamber 45 and the expansion chamber 35 is blocked.

  When the cylinder upper chamber 45 and the pressure accumulation chamber 2 a communicate with each other, the compressed air stored in the pressure accumulation chamber 2 a flows into the cylinder upper chamber 45. The compressed air that has flowed in pushes the hit surface 41D downward and accelerates the driver 4 downward. Since the striker 5 is urged by the spring 9 in a direction away from the flange portion 41 (upward), a gap is formed between the striking surface 5B and the striking surface 41D. When the compressed air flows into the gap, the compressed air presses the hit surface 41D downward when the compressed air flows from the pressure accumulating chamber 2a into the cylinder upper chamber 45. As a result, the driver 4 and the striker 5 are accelerated downward in a state where the hit surface 41D and the hit surface 5B are separated (the state shown in FIG. 2A).

  The striker 5 is a state in which the driver 4 is accelerated downward by the compressed air and at the same time the buffer member contact surface 5A and the buffer member 44A are in close contact with each other (the state shown in FIG. 2A). In order to accelerate downward in response to the force, the driver 4 and the striker 5 move downward with the same acceleration.

  When the driver 4 moves downward, the air in the cylinder lower chamber 46 is compressed and flows into the return air chamber 3a through the check valve 3A and the air passage 3b (FIG. 4). When the driver 4 further passes through the check valve 3A, the compressed air in the cylinder upper chamber 45 flows into the return air chamber 3a through the check valve 3A, and the air in the cylinder lower chamber 46 passes through the air passage 3b to return air. It flows into the chamber 3a (FIG. 5).

  The driver 4 that has accelerated downward hits the nail 71 at its lower end (first hit) and drives the nail 71 into the workpiece W. Here, when the nail 71 is struck and driven into the driven material W, the driver 4 receives an upward repulsive force from the nail 71 or the driven material W, and the downward speed of the driver 4 rapidly decreases. Or, since it becomes 0, the striker 5 moves downward against the biasing force of the spring 9 by the inertial force, and strikes the driver 4 (second strike) (FIG. 2B).

  If the nail 71 is not sufficiently driven into the driven material W only by the first impact and the nail head of the nail 71 is slightly lifted from the surface of the driven material W (FIG. 5), the bumper 36 and the flange The striker 5 strikes the driver 4 (second strike) in a state where it is not in contact with the portion 41. Since the bumper 36 and the flange portion 41 are not in contact with each other, when the striker 5 strikes the driver 4 (second strike), most of the striking force is transmitted to the nail 71 via the driver 4, and the nail 71 further It is driven into the workpiece W (FIG. 6).

  If the nail 71 can be sufficiently driven into the workpiece W by only the first impact, and the nail head of the nail 71 and the surface of the workpiece W are substantially flush, the driver 4 The striker 5 is located at a substantially bottom dead center, the bumper 36 and the flange portion 41 are in contact with each other, and the lower end of the driver 4 and the lower end of the injection passage 6a are substantially aligned in the reciprocating direction (vertical direction). 4 will be hit (second hit). Since the bumper 36 and the flange portion 41 are already in contact with each other, most of the impact force of the second impact is absorbed by the bumper 36. That is, since the striking force transmitted to the nail 71 via the driver 4 is very small, the nail 71 is not further driven into the driven material W by the second hit.

  Further, the upward reaction that the driver 4 receives from the nail 71 due to the first hit can be offset by the striker 5 moving downward and hitting the driver 4 (second hit). Thereby, the impact concerning an operator's handle can be relieved.

FIG. 7 is a graph schematically showing the change over time of the force applied to the fasteners of the nail driver 1 according to the first embodiment of the present invention and the conventional nail driver 101. FIG. 7A shows the case where the stopper cannot be driven sufficiently by the first impact, and FIG. 7B shows the stopper substantially flush with the surface of the material to be driven by the first impact. This represents the case where you can type The vertical axis represents the force F applied to the nail 71, and the horizontal axis represents the elapsed time T since the main valve 31 was opened. The broken line represents the time change of the force applied to the fastener by the driver 104 of the conventional nail driver 101, and the solid line represents the time change of the force F applied to the nail 71 by the driver 4 of the nail driver 1. Time t ₁ is the first of the peak of the strike, the time t ₂ represents the peak of the second strike.

  In the graph shown in FIG. 7A, the area surrounded by the solid line and the horizontal axis (momentum given to the nail 71 by the nail driver 1) and the area surrounded by the broken line and the horizontal axis (the nail driver 101 is shown). The momentum given to the fasteners is almost equal.

The single hitting of the conventional nailing machine 101 in FIG. 7A can be divided into two hits by the nailing machine 1. As shown in FIG. 7B, when the driven member W is soft, the first impact force is applied to the nail 71, and most of the second impact force is absorbed by the bumper 36. Therefore, force peaks F at time _{t 2} in FIG. 7 (b) less than the peak force F at time _{t 2} in FIG. 7 (a). Thereby, it is possible to suppress excessively driving the nail 71 into the driven material W. Further, as shown by the solid line in FIG. 7A, when the driven member W is hard, the two striking forces are applied to the nail 71, so that the striking force comparable to that of the nail driver 101 is exhibited. it can.

  When the operator returns the trigger 12, the compressed air is supplied again to the main valve chamber 33 by the trigger valve section 14, and the main valve 31 moves upward to shut off the cylinder upper chamber 45 and the pressure accumulating chamber 2a. At the same time, the cylinder upper chamber 45 and the expansion chamber 35 communicate with each other. Thereby, the compressed air in the cylinder upper chamber 45 is discharged to the outside air through the exhaust port 35a. Since the air in the return air chamber 3a cannot pass through the check valve 3A, it flows into the cylinder lower chamber 46 through the air passage 3b. As a result, the driver 4 is returned to the top dead center. At this time, when the spring 9 pushes up the striker 5 upward, the buffer member 44A and the buffer member contact surface 5A come into contact with each other and return to the initial state. The buffer member 44A alleviates an impact when the buffer member 44A and the buffer member contact surface 5A are in contact with each other.

  In this way, the driver 4 is provided with a predetermined amount of relative movement in the reciprocating direction of the driver 4 with respect to the driver 4, and the striker 5 that strikes the flange portion 41 of the driver 4 is provided. After the striker 5 strikes the flange 41 and strikes the nail 71 twice, the strike energy can be divided into small portions. As a result, the material to be driven W is hard, and if the nail 71 is not sufficiently driven into the material to be driven W by one hit, it can be surely driven by the second hit. Further, by counteracting the recoil generated in the housing 2 by the driver 4 hitting the nail 71 by hitting the flange portion 41 by the striker 5, the impact on the operator's handle when the nail 71 is driven is reduced. Can be relaxed.

  According to such a configuration, when the material to be driven W is soft and the nail 71 is driven flush with or near the surface of the material to be driven W by the first impact, the driver 4 is positioned at the bottom dead center. Since the flange portion 41 and the bumper 36 are in contact with each other and the lower end of the driver 4 is in contact with the workpiece W, the impact force of the second impact is absorbed by the bumper 36. The nail 71 is not excessively driven into the workpiece W. Accordingly, the driving depth of the nail 71 can be stabilized at a low cost without using a sensor or an arithmetic device, and the nail 71 can be concentrated on the surface of the driven material W or in the vicinity thereof.

  According to such a configuration, when the hitting speed of the driver 4 decreases, the striker 5 hits the flange portion 41, and an additional hitting force for hitting the nail 71 can be given to the driver 4.

  According to such a configuration, when the driver 4 receives a repulsive force from the nail 71, the repulsive force can be offset by striking the flange portion 41 with the striker 5, and the operator can hold the nail 71 when the nail 71 is driven. The impact on the hand can be reduced.

  According to such a configuration, a constant gap can be formed between the flange portion 41 and the striker 5 by the spring 9. Thereby, it is possible to prevent the flange portion 41 and the striker 5 from moving together in the reciprocating direction in a state where the flange portion 41 and the striker 5 are in close contact with each other, and it is possible to reliably hit the nail 71 for the second time.

  According to such a configuration, it is possible to mitigate the impact when the striker 5 collides with the stopper portion 44 due to the reaction after the striker 5 strikes the flange portion 41. Thereby, the impact applied to the operator's handle immediately after the nail 71 is driven can be reduced.

  According to such a configuration, the nail 71 can be hit using compressed air as a power source for the driver 4.

  Next, a second embodiment of the present invention will be described with reference to FIGS. About the same structure as 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIGS. 8 and 9, the driver 204 of the nailing machine 201 is made of metal, and includes a flange portion 241 that slides on the inner peripheral surface of the cylinder 3, a blade portion 42 that strikes a stopper, and a striker. It comprises a support portion 43 that slidably supports 205 in the reciprocating direction (vertical direction in FIG. 9), and a stopper portion 44 that prevents the striker 205 from coming off. A spring 209 is provided between the striker 205 supported by the support portion 43 and the flange portion 241.

  The spring 209 urges the striker 205 in a direction away from the flange portion 241. The spring 209 is thicker and stronger than the spring 9 in the first embodiment of the present invention.

  Specifically, it is set to such an extent that the driver 204 and the striker 205 are not brought into close contact by the pressing force of the compressed air when the compressed air flows into the cylinder upper chamber 45.

  The flange portion 241 has a substantially disc shape, and a cylinder sliding contact surface 241A that is in sliding contact with the inner peripheral surface of the cylinder 3 is defined on the outer peripheral surface thereof. A face 241D to be hit by the striker 205 is defined on the surface of the flange part 241 facing the striker 205, and a groove part that comes into contact with the lower end of the spring 209 that is recessed downward in the radial direction of the hit face 241D. 241a is formed. The support portion 43 extends upward from the radially inner side of the groove portion 241a. A bumper contact surface 241C that can contact the bumper 36 is defined on the surface opposite to the hit surface 241D. The blade portion 42 extends downward from the radially inner side of the bumper contact surface 241C.

  The striker 205 has a substantially disc shape, and its diameter is slightly smaller than the diameter of the cylinder 3. An insertion hole 205a that penetrates in the reciprocating direction and through which the support portion 43 is inserted is formed at the center of the striker 205 in the radial direction. An O-ring 205 </ b> C is provided on the outer peripheral surface of the striker 205, and is in sliding contact with the inner peripheral surface of the cylinder 3. An O-ring 205D is provided on the inner peripheral surface of the striker 205, and is in sliding contact with the striker sliding contact surface 43B. The O-ring 205C and the O-ring 205D block the cylinder upper chamber 45 and the cylinder lower chamber 46 from each other.

  The striker 205 is supported by the support portion 43 so that the support portion 43 is inserted into the insertion hole 205a. Since the inner diameter of the insertion hole 205a is slightly larger than the outer diameter of the support portion 43, the inner peripheral surface of the insertion hole 205a slides on the striker sliding contact surface 43B. On the upper surface of the striker 205, a buffer member contact surface 205A that can contact the buffer member 44A is defined. On the lower surface of the striker 205, a striking surface 5B for striking the striking surface 241D of the flange portion 241 is defined, and a spring that is in contact with the upper end of the dent spring 209 upwards inward in the radial direction of the striking surface 205B. A contact groove 205b is formed.

  Next, the operation of the nailing machine 201 will be described.

  When the trigger 12 operation of the nailing machine 201 is performed, the main valve 31 is opened, and the compressed air flows from the pressure accumulating chamber 2a into the cylinder upper chamber 45.

  The compressed air that has flowed in presses the striker 205 downward. As a result, the striker 205 accelerates downward. At the same time, the pressing force of the compressed air is transmitted to the driver 204 via the spring 209, so that the driver 204 and the striker 205 move downward with the same acceleration.

  The driver 204 that has accelerated downward hits the nail 71 at the lower end (first hit) and drives the nail 71 into the workpiece W. Here, when the nail 71 is struck and driven into the workpiece W, the driver 204 receives an upward repulsive force from the nail 71 or the workpiece W, and the downward speed of the driver 204 decreases rapidly. Or it becomes 0. Since the striker 5 continues to receive the downward pressing force by the compressed air, the striker 5 moves downward and strikes the driver 204 (second strike).

  When the operator returns the trigger 12, the compressed air is supplied again to the main valve chamber 33 by the trigger valve section 14, and the main valve 31 moves upward to shut off the cylinder upper chamber 45 and the pressure accumulating chamber 2a. At the same time, the cylinder upper chamber 45 and the expansion chamber 35 communicate with each other. Thereby, the compressed air in the cylinder upper chamber 45 is discharged to the outside air through the exhaust port 35a. Since the air in the return air chamber 3a cannot pass through the check valve 3A, it flows into the cylinder lower chamber 46 through the air passage 3b. As a result, the driver 204 is returned to the top dead center. At this time, when the spring 209 pushes up the striker 205 upward, the buffer member 44A and the buffer member contact surface 205A come into contact with each other and return to the initial state.

  According to such a configuration, the compressed air can be used as a power source for the striker 205 and the nail 71 can be hit.

  The driving machine according to the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made within the scope described in the claims.

  In the above-described embodiment, compressed air is used as a power source, but the present invention is not limited to this configuration. For example, a biasing force of a spring may be used as a power source. The spring-type driving machine using the spring biasing force as a power source does not require an O-ring for blocking the inside of the cylinder into the upper chamber and the lower chamber, and therefore the number of members can be reduced.

Incidentally, by changing the mass ratio of the driver 4 and the striker 5 of the embodiment described above, it is possible to adjust the force F to be applied to the nail 71 at time t ₁ and time t ₂ shown in Figure 7 (a). For example, when setting a large mass of the striker 5 from the driver 4, the peak force F at time t ₂ is higher than the peak force F at time t _1. As a result, it is possible to realize an optimum hit according to the softness of the driven member W.

  In the above-described embodiment, the driver 4 is provided with the support portion 43 that extends in the reciprocating direction of the driver 4 and the striker 5 is slidably supported by the support portion 43. For example, the striker 5 may be provided with an extending portion extending in the reciprocating direction, and the striker 5 may be supported relative to the driver 4 via the extending portion. good.

  Further, the distance by which the striker 5 can be relatively moved with respect to the driver 4 is set by the stopper 44 provided in the driver 4, but the present invention is not limited to such a configuration. For example, one end is a flange portion. 41 may be configured such that the distance that the striker 5 can move is set by a spring whose other end is connected to the striker 5.

1, 201 ··· Nailer, ··· Housing, 2a ·· Accumulator, 3 ·· Cylinder, 4, 204 ·· Driver, 5, 205 ·· Striker, 6 ·· Nose part, 6a ·· Injection passage , 7 Magazine, 9, 209 Spring, 31 Main valve, 36 Bumper, 41, 241 Flange section 42 Blade section 43 Support section 44 Stopper section 44A ・ ・ Buffer member, 45 ・ ・ Cylinder upper chamber

Claims (8)

A housing;
A nose portion formed with an injection passage through which a stopper is injected;
A magazine for supplying the stopper to the nose portion;
A driver which is disposed in the housing so as to be reciprocally movable, has a flange portion whose diameter is enlarged in a direction perpendicular to the reciprocating direction, and strikes the stopper supplied from the magazine to the injection passage;
A driving machine comprising: a striker which is provided so as to be movable relative to the driver in a predetermined amount in the reciprocating direction and hits the flange portion. Further comprising a bumper located below the flange portion and capable of contacting the flange portion;
The flange portion and the bumper abut when the driver moves toward the nose portion and the lower end of the driver and the lower end of the injection passage come close to each other in the reciprocating direction. The driving machine according to 1.   3. The striker strikes the flange portion according to a decrease in a moving speed of the driver in the reciprocating direction after the driver strikes the stopper. 4. Driving machine.   3. The driving machine according to claim 1, wherein the striker hits the flange portion according to a repulsive force received from the stopper by the driver hitting the stopper. 4.   The urging member provided between the flange portion and the striker and urging the striker in a direction away from the flange portion is further provided. The driving machine described.   The driver further includes a stopper portion that restricts movement of the striker in a direction away from the driver, and a buffer member is provided between the stopper portion and the striker in the reciprocating direction. The driving machine according to claim 1 or 5. A pressure accumulating chamber that is defined in the housing and stores compressed air;
A cylinder housed in the housing, extending in the reciprocating direction, and supporting the driver slidably in the reciprocating direction;
A main valve housed in the housing and controlling the flow of the compressed air from the pressure accumulating chamber into the cylinder;
Further comprising
The driving machine according to any one of claims 1 to 6, wherein a cylinder upper chamber is defined by the flange portion, the cylinder, and the main valve. A pressure accumulating chamber that is defined in the housing and stores compressed air;
A cylinder housed in the housing, extending in the reciprocating direction, and supporting the striker slidably in the reciprocating direction;
A main valve housed in the housing and controlling the flow of the compressed air from the pressure accumulating chamber into the cylinder;
Further comprising
The driving machine according to any one of claims 1 to 6, wherein a cylinder upper chamber is defined by the striker, the cylinder, and the main valve.

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