JP6565306B2 - Driving machine - Google Patents

Description

  The present invention relates to a driving machine that moves a bit with pressure to hit a stopper.

  Patent Document 1 discloses a structure of a driving machine that hits a stopper with the pressure of a pressure chamber. The driving machine described in Patent Document 1 includes a motor provided in a housing, a gear for transmitting the rotational force of the motor to a cam, a cylinder provided in the housing, and a piston accommodated in the cylinder so as to be reciprocally movable. A driver blade (bit) fixed to the piston, and a bellows provided in the cylinder. The bellows is extendable, the first end of the bellows is connected to the piston, and the second end of the bellows is fixed to the housing. Compressed air is enclosed in the bellows to form a pressure chamber.

  The driving machine described in Patent Document 1 lifts a driver blade halfway with one cam, and then lifts the driver blade to top dead center with a gear pin. The cam is rotated by the rotational force of the motor, and the piston is moved upward by the rotational force of the cam. While the piston moves from the bottom dead center toward the top dead center, the bellows is compressed and the pressure in the pressure chamber rises. When the piston reaches the top dead center and the locking part comes off the locked part, the driver blade moves from the top dead center toward the bottom dead center by the pressure in the pressure chamber. As a result, the driver blade strikes the stop.

JP 2014-69289 A

  However, since the driving machine described in Patent Document 1 has only one cam, when attempting to secure the stroke of the piston, the cam and gear become larger, the driving machine becomes larger, and the driving machine further increases. There arises a problem that the weight of the built-in machine increases.

  In addition, when the cam is enlarged, the shape of the housing portion that covers the cam is raised, and it becomes difficult to see the vicinity of the injection port of the driving machine during the driving operation, which makes it difficult to perform the driving operation.

  An object of the present invention is to provide a driving machine that can be miniaturized.

  The driving machine according to an embodiment includes a housing, a cylinder provided in the housing, a piston provided in the cylinder so as to be reciprocable, and attached to the piston, and is stopped by pressure in the cylinder. A bit for striking the tool, and a moving mechanism for moving the piston in the cylinder. Further, the moving mechanism includes a rotating member disposed on both sides of the bit with the bit interposed therebetween and engaged with the bit.

  According to the present invention, the size of the driving machine can be reduced.

It is a side view which shows the structure of the driving machine of embodiment of this invention in a partial cross section. It is a top view which shows typically the driving machine of FIG. It is a block diagram which shows an example of the structure cut | disconnected along the AA line shown in FIG. It is a block diagram which shows an example of the structure cut | disconnected along the BB line shown in FIG. It is a block diagram which shows an example of the structure cut | disconnected along CC line shown in FIG. It is a block diagram which shows an example of the structure cut | disconnected along the DD line | wire shown in FIG. It is a block diagram which shows an example of operation | movement from the winding start of the driving machine shown in FIG. 1 to winding completion. It is a block diagram which shows an example of the relationship between the movement position of the bit in the operation | movement shown in FIG. 7, and the rotational position of a cam.

  A driving machine according to an embodiment of the present invention will be described with reference to FIGS.

  The driving machine 10 shown in FIGS. 1 to 3 has a driving machine main body 11. The driving machine main body 11 includes a cylindrical housing 14, a nose portion 15 having an injection port 23 for injecting a stopper, a motor case 16 continuing to the housing 14, a grip 17 continuing to the housing 14, and a grip 17 and a mounting portion 18 continuing to the motor case 16. The nose portion 15 extends in a direction along the center line C <b> 1 of the housing 14.

  A battery 12 that is attached to and detached from the mounting portion 18 is provided. Further, a magazine 13 that is attached to and detached from the driving machine main body 11 is provided. Further, the driving machine 10 has an electric motor 19 and a striking mechanism 20. The electric motor 19 is accommodated in the motor case 16. As shown in FIG. 2, the magazine 13 accommodates a large number of bar-like nails (stoppers) 24, and the magazine 13 supplies the nails 24 one by one to the injection port 23.

  The striking mechanism 20 includes a bit (a striking element, also called a driver blade) 22 and a piston 21. Further, a trigger 25 is provided on the grip 17. The battery 12 includes a storage case and a plurality of battery cells stored in the storage case. The battery cell is a secondary battery that can be charged and discharged, and a lithium ion battery, a nickel hydrogen battery, a lithium ion polymer battery, a nickel cadmium battery, or the like can be used as the battery cell. The battery 12 is a direct current power source. The electric power of the battery 12 is supplied to the electric motor 19.

  The electric motor 19 includes a stator fixed to the motor case 16 and a rotor provided rotatably in the motor case 16. The electric motor 19 can be a brushless motor. The stator is obtained by winding a coil for energization on a steel plate. The rotor has a permanent magnet fixed to a rotating shaft. That is, the parts of the electric motor 19 are steel materials. A current flows through the coil to form a rotating magnetic field, and the rotor rotates.

  A cylinder 33 is provided in the cylindrical housing 14. The cylinder 33 has a cylindrical shape, and the cylinder 33 is fixed to the housing 14 in a direction along the center line C1. Further, a damper 34 is fixed in the housing 14. The damper 34 is disposed at the open end of the cylinder 33. Specifically, a damper 34 is disposed at the open end of the cylinder 33 near the nose portion 15. The damper 34 is integrally formed of an elastic body (rubber or urethane material). The damper 34 is formed in an annular shape around the center line C <b> 1, and the damper 34 includes a shaft hole 35.

  Further, the piston 21 is operable along the center line C <b> 1 in the cylinder 33. That is, the piston 21 is provided in the cylinder 33 so as to be able to reciprocate.

  The bit 22 has a blade shape having a predetermined length in the direction along the center line C <b> 1, and the end portion of the bit 22 in the longitudinal direction is fixed to the piston 21. The bit 22 is disposed along the center line C <b> 1 and is movable in the shaft hole 35 and the injection port 23. That is, the bit 22 has one end in the longitudinal direction attached to the piston 21 and strikes the stopper with the pressure in the cylinder 33.

  The driving machine 10 of the present embodiment has a hoisting mechanism that moves the piston 21 in the cylinder 33 in a direction opposite to the tip side of the nose portion 15, that is, in a sealed pressure chamber (pressure accumulating chamber 42 described later) side. (Moving mechanism) 26 is provided. As shown in FIG. 3, the winding mechanism 26 is disposed on both the left and right sides of the bit 22 with the bit 22 interposed therebetween, and a high-speed side cam (first cam) 29 that is a rotating member that engages with the bit 22 and a low-speed cam. A side cam (second cam) 30 is included.

  The high-speed cam 29 and the low-speed cam 30 are both engaged with the output shaft 19a of the electric motor 19 via a gear, and are rotated via a gear (a motor drive gear 37 described later) by driving the electric motor 19. To do.

  Therefore, when the driving machine 10 presses the push rod 38 on the tip side of the nose portion 15 against an object such as wood and pulls the trigger 25 in this state, the driving of the electric motor 19 is started, and the high speed of the winding mechanism 26 is increased. The side cam 29 and the low speed side cam 30 rotate, and the bit 22 is lifted (wound up) by the rotational force of the two cams. After the bit is lifted, the bit 22 is released, and the released bit 22 is ejected to hit the stopper.

  That is, in the driving machine 10 of the present embodiment, as shown in FIGS. 2 and 3, two cams (a high speed side cam 29 and a low speed side cam 30) are arranged on both side surfaces of the bit 22 with the bit 22 interposed therebetween. The bit 22 is wound up using these two cams. By using two cams in this manner, the size of the cam can be reduced, and the size of the electric motor 19 can also be reduced, so that the driving machine 10 can be downsized. That is, the driving machine 10 can be made compact. Further, the weight of the driving machine 10 can be reduced.

  Further, by performing the winding operation of the bit 22 using two cams, the cam can be reduced in size, and the shape of the housing portion that covers the cams can also be reduced.

  Thereby, at the time of the driving work by the driving machine 10, the vicinity of the injection port of the driving machine can be easily seen, and the driving work can be easily performed. That is, the workability of driving by the driving machine 10 can be improved.

  Note that protrusions are provided on both side surfaces of the bit 22, and the pins (engagement portions) provided on the respective cams disposed on both side surfaces of the bit 22 engage with the protrusions. Thus, the winding operation of the bit 22 is performed. Here, as shown in FIG. 3, the two cams (the high speed side cam 29 and the low speed side cam 30) rotate in different directions. The bit 22 is wound up while taking up the winding operation of the bit 22 with two cams.

  As shown in FIG. 1, a push rod 38 is provided on the distal end side of the nose portion 15 of the driving machine 10. The push rod 38 is movable with respect to the nose portion 15 within a predetermined range of the center line C1. The movement range of the push rod 38 is regulated by a stopper. The push rod 38 is stopped by being pushed in the direction along the center line C1 by the force of the spring. Specifically, the push rod 38 is pushed away from the damper 34 by the force of the spring. When the push rod 38 is pressed against the object, the push rod 38 moves in a direction approaching the damper 34 against the force of the spring, and the push rod 38 comes into contact with the stopper and stops.

  A wall member 39 is provided in the housing 14. The wall member 39 includes a cylindrical portion 40 and a disc portion 41 that is continuous with the cylindrical portion 40. An end portion on the opposite side of the damper 34 in the length direction of the cylinder 33 is disposed in the cylindrical portion 40. The cylindrical portion 40 is fixed to the cylinder 33.

  A pressure accumulating chamber 42 is formed from the inside of the cylinder 33 to the inside of the wall member 39. The pressure accumulation chamber 42 is hermetically sealed by a seal member, and air (gas) that is a compressive fluid is sealed in the pressure accumulation chamber 42. The pressure in the pressure accumulating chamber 42 changes when the piston 21 operates. The piston 21 receives the pressure of the pressure accumulating chamber 42 and is urged in a direction along the center line C <b> 1 in a direction approaching the damper 34.

  Thereby, when the bit 22 and the piston 21 are operated by the rotation of the first cam and the second cam, which are rotating members, the pressure in the pressure accumulating chamber 42 is increased. Then, after the pressure in the pressure accumulating chamber 42 rises, the engaging parts (pins 29a, 30a (first engaging part), 29b, 30b (second engaging part) shown in FIG. When the projections 27a to 27d and 28a to 28b of FIG. 7 described later are released (released), the bit 22 operates (fires and injects) by the pressure of the pressure accumulating chamber 42 to hit the object.

  The driving machine 10 includes a pressing detection sensor that detects that the push rod 38 is pressed against an object and a trigger switch 43 that detects that the trigger 25 is operated. Further, an angle detection sensor for detecting the rotation angle of the high speed side cam 29 and the low speed side cam 30 is provided. In addition, the driving machine 10 includes a controller that processes signals from the pressing detection sensor, the trigger switch 43, and the angle detection sensor to rotate and stop the electric motor 19.

  Further, a control board 44 is provided in the mounting portion 18, and the controller is attached to the control board 44. The control board 44 includes an electric circuit that connects the battery 12 and the electric motor 19, and a switching element is provided in the electric circuit. Then, the controller turns on and off the switching element.

  Next, the winding mechanism (moving mechanism) 26 of the bit 22 in the driving machine 10 of the present embodiment will be described in detail.

  As shown in FIG. 3, in the driving machine 10 of the present embodiment, cams are disposed on both side surfaces of the bit 22 with the bit 22 in between (a first cam (high-speed cam 29) and a second cam ( Low speed side cam 30)). Each of the first cam and the second cam is provided with a plurality of (for example, two) pins 29a, 29b, 30a, 30b (engagement portions), and these pins 29a, 29b, 30a, 30b engages with the protrusions 27a to 27d and 28a to 28b of FIG. 7 of the bit 22 and pushes each protrusion toward the extending direction of the bit 22, thereby winding the bit 22 toward the pressure accumulating chamber 42 (moving) Structure).

  The first cam and the second cam, which are two cams (rotating members), are rotated by the drive of the electric motor 19, and the pins provided on the respective cams are engaged with the protrusions provided on the bit 22. By doing so, the bit 22 is moved to the pressure accumulation chamber 42 side.

  In the driving machine 10, the first cam and the second cam have different rotation speeds (the number of rotations per unit time). This is because when the first cam and the second cam rotate at the same rotational speed, when the pin of one cam releases the protrusion at an arbitrary position, the other pin also rotates at the same rotational speed. Since the relative position of one pin and the other pin does not change, there is a possibility that the bit 22 cannot be released (cannot be fired) without the other pin being separated from the protrusion of the bit 22.

  In order to avoid this phenomenon, the rotational speeds (number of rotations per unit time) of the two cams are intentionally changed. And in changing the rotational speed of a 1st cam and a 2nd cam, it is preferable to make the ratio of the rotational speed of a 1st cam and a 2nd cam into 1 / integer (an integer greater than or equal to 2). This is because when the rotational speeds of the two cams are set, the integer of 1 is easier to assume the pin position.

  Therefore, the pin position is most easily assumed when the ratio of the rotational speeds of the first cam and the second cam is 2: 1. In this case, if the first cam rotates by 180 °, the second cam rotates by 90 °. Therefore, the pin positions of both cams can be easily grasped, and the pin positions can be easily set.

  For example, the ratio of the rotational speed of the first cam and the second cam is 2: 1, and two pins (pins 29a and 29b and pins 30a and 30b) are provided on each cam as shown in FIG. In this case, the first cam is the high speed side cam 29 and the second cam is the low speed side cam 30. That is, the first cam having a high rotational speed rotates at a high speed, and hence the high-speed cam 29 is used.

The ratio of the rotational speeds of the two cams can be set to 2: 1 by a speed change mechanism using gears.

  The state shown in FIG. 3 is, as an example, when the protrusion 27a (see FIG. 7) of the bit 22 engaged with the pin 29a in the high-speed cam 29 is pushed up and released toward the pressure accumulating chamber 42, almost simultaneously with this release. The engagement of the pin 29b with the protruding portion 27b of the bit 22 starts in the high-speed side cam 29, and the protruding portion 27b is pushed up toward the pressure accumulating chamber 42 by the pin 29b.

  As described above, in the driving machine 10 according to the present embodiment, one of the pins in the two cams pushes up the protruding portion of the bit 22 and releases the protruding portion. Each protrusion and each pin are provided so that the bit 22 is rolled up (pushed up) by taking over the pushing-up operation.

  In other words, the high-speed cam 29 and the low-speed cam 30 repeatedly take over the winding operation of the bit 22 and wind up the bit 22 without a gap. When the final stage pin is away from the protrusion, that is, when all the pins are released from the protrusion, the bit 22 is released (fired or ejected) to hit the stopper.

  In this way, the driving machine 10 is provided with two cams, and the bit 22 is wound up by a plurality of pins provided on each of the two cams while taking over without any gap between the pins. Thus, the bit 22 can always be wound up toward the pressure accumulating chamber 42 side, and the stopper can be driven in a short time.

  However, if the pin arrangement is such that any one of the pins always engages with the protrusion of the bit 22 at all the rotation angles of the two cams, the bit 22 cannot be released. Therefore, in the pin arrangement of the two cams, the pin arrangement must be such that none of the pins is engaged with the protruding portion of the bit 22.

  Further, the final stage of winding when the bit 22 is released (fired and injected) immediately after the winding is finished is performed from the final pin in a state where the low-speed cam (low-speed cam 30) is rotating at a reduced speed. It is preferable to release the protrusions. In other words, it is preferable that the final stage immediately before the bit release is performed by the cam rotated at a reduced speed. This is because the torque can be increased by winding up with a decelerated cam (low-speed cam 30) in the final stage of winding in which the reaction force against the piston 21 is greatest when winding up, and the load on the electric motor 19 is reduced. Can be rolled up.

  Thereby, the lifetime of the driving machine 10 can be extended, and the reliability of the driving machine 10 can be further improved.

  In the driving machine 10, the first cam and the second cam are engaged with the motor drive gear 37 shown in FIG. 5 provided on the rotation shaft (output shaft 19 a) of the electric motor 19 via the gears. In addition, a speed change mechanism is provided such that the gear ratio between the motor drive gear 37 and the first cam gear for the first cam is different from the gear ratio between the motor drive gear 37 and the second cam gear for the second cam. . Thereby, the rotational speed of the second cam can be decelerated from the rotational speed of the first cam.

  Next, the winding mechanism 26 incorporated in the driving machine 10 will be described in detail with reference to FIGS. Here, the first cam is the high speed side cam 29, the second cam is the low speed side cam 30, and the ratio of the rotational speeds of the high speed side cam 29 and the low speed side cam 30 is 2: 1. This will be described as an example.

  As shown in FIG. 4, the high-speed cam 29 is disposed on one side of the bit 22 in the side surface direction so as to engage with the bit 22, and the low-speed cam 30 is also engaged with the bit 22 on the other side opposite thereto. Are arranged. The high speed side cam 29 is engaged with the protruding portion 27 b of the bit 22, and the low speed side cam 30 is engaged with the protruding portion 28 a of the bit 22.

  The high-speed cam 29 is connected to a high-speed cam gear (first cam gear) 31 and is provided on the same rotation shaft. Similarly, the low-speed cam 30 is connected to a low-speed cam gear (second cam gear) 32 and is provided on the same rotation shaft. The high speed side cam gear 31 is rotatably attached via a bearing 45a, and the low speed side cam gear 32 is rotatably attached via a bearing 45b and a bearing 45c.

  As shown in FIG. 6, a motor drive gear 37 is rotatably attached to the output shaft 19 a of the electric motor 19. The motor drive gear 37 has a two-stage speed change mechanism and is rotatably supported by a bearing 46b. The output shaft 19a of the electric motor 19 is supported by a bearing 46a.

  In the two-stage transmission mechanism of the motor drive gear 37, R: 1 / 2R, that is, 2: 1, can be set, and as shown in FIG. The cam gear 31 is engaged. On the other hand, the low-speed cam gear 32 is meshed with the 1 / 2-speed (1 / 2R) gear via the planetary gear 36 having a large number of teeth. The rotational speed of the cam gear 31 is ½.

  That is, the high-speed cam 29 is rotated by the rotation of the high-speed cam gear 31 that meshes with the motor drive gear 37 provided on the rotation shaft (output shaft 19a) of the electric motor 19, while the low-speed cam 30 is rotated by the motor drive gear. Rotate by rotation of the low-speed cam gear 32 that meshes with 37. The gear ratio between the motor drive gear 37 and the high-speed cam gear 31 is different from the gear ratio between the motor drive gear 37 and the low-speed cam gear 32, and the low-speed cam 30 rotating via the planetary gear 36 is different. As a result, the rotational speed is ½ that of the high-speed cam 29.

  As described above, the motor drive gear 37 is rotated by driving the electric motor 19, and the rotation of the motor drive gear 37 causes the high-speed cam 29 and the low-speed cam 30 to rotate at a rotation speed ratio of 2: 1. . That is, the bit 22 can be wound up by the high speed side cam 29 and the low speed side cam 30. Further, by using two cams, two cams having a small diameter can be used, and the driving machine 10 can be downsized. Further, the bit 22 can be wound even if a small motor is used by increasing the torque by using the low-speed cam 30 by changing the gear ratio.

  Next, the winding operation of the bit 22 in the driving machine 10 of the present embodiment will be described with reference to FIGS. 7 and 8. Here, a case where the ratio of the rotational speeds of the first cam (high-speed cam 29) and the second cam (low-speed cam 30) is 2: 1 will be described as an example. As shown in FIG. 8, four protrusions 27a, 27b, 27c, and 27d that engage with the high-speed cam 29 are provided at predetermined intervals on the high-speed side surface of the bit 22. On the other hand, on the side surface of the bit 22 on the low speed side, two protrusions 28a and 28b that engage with the low speed side cam 30 are provided at predetermined intervals.

  Further, in the high-speed cam 29 and the low-speed cam 30, the angles formed by the two pins 29a and 29b and the pins 30a and 30b with respect to the centers C2 and C3 of the cam rotation shafts are other than 180 °.

  That is, the two pins provided on each of the high speed side cam 29 and the low speed side cam 30 are not arranged on a straight line including the centers C2 and C3 of the rotation shafts of the respective cams.

  First, the electric motor 19 is driven by operating the trigger 25 of the driving machine 10 at the start of winding in the first step. By driving the electric motor 19, the high-speed cam 29 and the low-speed cam 30 rotate at a ratio of the rotation speed of 2: 1. Then, the pin 29a of the high-speed cam 29 is engaged with the protrusion 27a of the bit 22, and the bit 22 is wound up. Thereafter, the pin 29b engages with the protruding portion 27b of the bit 22 at substantially the same time as the pin 29a releases the protruding portion 27a, and the bit 22 is wound up.

  Next, in the second step, at substantially the same time as the pin 29b of the high-speed cam 29 releases the projection 27b, the pin 30b of the low-speed cam 30 engages with the projection 28a of the bit 22 and winds up the bit 22. That is, the low speed side cam 30 takes over the winding operation of the bit 22 from the high speed side cam 29.

  Next, at the same time as the pin 30b of the low-speed cam 30 releases the protrusion 28a in the third step, the pin 29a of the high-speed cam 29 engages with the protrusion 27c of the bit 22 and winds up the bit 22. That is, the high speed side cam 29 takes over the winding operation of the bit 22 from the low speed side cam 30 again.

  Next, in the fourth step, the pin 29b of the high-speed cam 29 engages the protrusion 27d to wind up the bit 22, and then the pin 30b of the low-speed cam 30 is released almost simultaneously with the release of the pin 29b. The bit 22 is wound up by engaging with the projection 28b. Thereby, the low speed side cam 30 takes over the winding operation of the bit 22 from the high speed side cam 29.

  Then, at the end of the winding of the fifth step, the pin 30a of the low-speed cam 30 engages with the protruding portion 28b of the bit 22 to wind up the bit 22, and immediately after that, the pin 30a releases the protruding portion 28b of the bit 22. . That is, the final stage of the winding operation is performed by the low speed cam 30.

  Then, the bit 22 is released by the release of the protruding portion 28b of the bit 22 by the pin 30a, and the piston 21 is pressed by the pressure of the pressure accumulating chamber 42, and the bit 22 is ejected (fired), and the nail 24 shown in FIG. Type in things.

  In the final contact between the pin 30a immediately before the release of the bit 22 in the fifth step and the protrusion 28b of the bit 22, as shown in FIG. ) A pin (second engaging portion) 30b is located in a region on the piston 21 side shown in FIG. 7 from an imaginary line L connecting 30a and the center C3 of the rotating shaft of the low-speed cam 30.

  This is because, in the high-speed cam 29 and the low-speed cam 30, the angles formed by the two pins 29a and 29b and the pins 30a and 30b with respect to the centers C2 and C3 of the cam rotation shafts are angles other than 180 °. Because it is. As a result, the final stage winding immediately before releasing the bit 22 can be performed by the low-speed cam 30.

  As a result, in the final stage of the hoisting in which the reaction force against the piston 21 is greatest when the bit 22 is hoisted, the hoisting is performed by the decelerated cam (low-speed cam 30), so that the torque can be increased, and the electric motor 19 Can be wound up with a small load.

  Further, in the driving machine 10 according to the present embodiment, an electric control part such as a latch is unnecessary, so that not only the driving machine 10 can be downsized at a low cost but also a smaller motor. Adoption becomes possible.

  It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention.

  For example, in the above embodiment, the case where the ratio of the rotational speeds of the first cam and the second cam is 2: 1 has been described as an example, but the ratio of the rotational speeds of the two cams is 3: 1 or 4 1 or the like, and may be an integer (an integer of 2 or more): 1.

  Moreover, the stopper hit | damaged by a driving machine may be a tucker etc. bent in the U shape other than a rod-shaped nail.

  In addition, as in the present embodiment, as a thing having a function equivalent to a configuration using a cam that rotates at a high speed and a low speed by using a speed reduction mechanism, a plurality of cams having different diameters, for example, the cam diameter is set to 1 to 2. Thus, even if both cams are rotated at a constant speed, the peripheral speed is in a two-to-one relationship, and thus is included in the scope of the present invention. In this case, the arrangement of the pins 30a and 30b can be appropriately arranged at an interval at which the operation is the same as that of the above embodiment.

  Further, the shape of the pressure accumulating chamber 42 may not be particularly described in the present embodiment as long as the compressed gas can be stored.

  For example, the pressure accumulation chamber 42 may be provided beside the cylinder 33, or the pressure accumulation chamber 42 may be provided so as to surround the cylinder 33.

  DESCRIPTION OF SYMBOLS 10 ... Placing machine, 11 ... Placing machine main body, 12 ... Battery, 13 ... Magazine, 14 ... Housing, 15 ... Nose part, 16 ... Motor case, 17 ... Grip, 18 ... Mounting part, 19 ... Electric motor, 19a DESCRIPTION OF SYMBOLS ... Output shaft, 20 ... Stroke mechanism, 21 ... Piston, 22 ... Bit, 23 ... Injection port, 24 ... Nail (stopper), 25 ... Trigger, 26 ... Winding mechanism (moving mechanism), 27a, 27b, 27c, 27d ... Projections, 28a, 28b ... Projections, 29 ... High speed side cam (first cam, rotating member), 29a ... Pin (first engagement part), 29b ... Pin (second engagement part), 30 ... Low speed Side cam (second cam, rotating member), 30a ... pin (first engaging portion), 30b ... pin (second engaging portion), 31 ... high speed side cam gear (first cam gear), 32 ... low speed side cam gear ( Second cam gear), 33 ... cylinder, 34 ... damper 35 ... Shaft hole, 36 ... Planetary gear, 37 ... Motor drive gear, 38 ... Push rod, 39 ... Wall member, 40 ... Cylindrical part, 41 ... Disc part, 42 ... Accumulation chamber, 43 ... Trigger switch, 44 ... Control Board, 45a, 45b, 45c ... bearings, 46a, 46b ... bearings

Claims (10)

A housing;
A cylinder provided in the housing;
A piston provided in the cylinder so as to be capable of reciprocating;
A bit attached to the piston and striking a stop with pressure in the cylinder;
A moving mechanism for moving the piston in the cylinder;
A motor for driving the moving mechanism;
With
The moving mechanism has a first cam and a second cam that are disposed on both sides of the bit with the bit interposed therebetween and engage with the bit,
A driving machine for branching the output of the motor and transmitting it to the first cam and the second cam .   The driving machine according to claim 1, wherein the first cam and the second cam have different rotational speeds. The first cam is rotated by rotation of a first cam gear that meshes with a motor drive gear provided on a rotation shaft of the motor;
The second cam is rotated by rotation of a second cam gear that meshes with the motor drive gear,
And the gear ratio of the first cam gear and the motor drive gear, the gear ratio of the second cam gear and the motor drive gear, Mixed, driving machine according to claim 1. Wherein each of the first cam and the second cam has an engagement portion, the engagement portion, and the protrusion are engaged provided on the bit, according to any one of claims 1 to 3 Machine. Each of the first cam and the second cam has a plurality of engaging portions, and the rotation shafts of the first cam and the second cam of the plurality of engaging portions in a plan view. The driving machine according to any one of claims 1 to 3 , wherein an angle formed by the first engaging portion and the second engaging portion with respect to the center is other than 180 °.   The rotation speed of the second cam is lower than that of the first cam, and a plurality of engaging portions of the second cam include a final portion of the engaging portion and the protruding portion of the bit before the bit is released. The second engagement portion is located in a region closer to the piston than an imaginary line connecting the first engagement portion that contacts the protrusion and the center of the rotation shaft of the second cam at the time of contact. The driving machine according to 1. The driving machine according to claim 6 , wherein the final contact between the engaging portion and the protruding portion of the bit before the bit is released is performed by the second cam. A pressure accumulation chamber whose pressure is changed by the operation of the piston is provided, and when the bit and the piston are operated by the rotation of the first cam and the second cam, the pressure of the pressure accumulation chamber is increased,
After the pressure in the pressure accumulating chamber rises, when the engaging portions of the first cam and the second cam are separated from the protruding portion of the bit, the bit operates with the pressure in the pressure accumulating chamber, and the object The driving machine according to claim 1, wherein A housing;
A cylinder provided in the housing;
A piston provided in the cylinder so as to be capable of reciprocating;
A pressure accumulating chamber in which the pressure is changed by the operation of the piston;
A bit attached to the piston and striking a stop with pressure in the cylinder;
A moving mechanism for moving the piston in the cylinder;
A motor for driving the moving mechanism;
With
The moving mechanism has a first cam and a second cam that are disposed on both sides of the bit with the bit interposed therebetween and engage with the bit,
The first cam and the second cam rotate by driving the motor,
When the bit and the piston are operated by the rotation of the first cam and the second cam, the pressure in the pressure accumulating chamber increases,
After the pressure in the pressure accumulating chamber rises, when the engaging portions of the first cam and the second cam are separated from the protruding portion of the bit, the bit operates with the pressure in the pressure accumulating chamber, and the object the striking, driving machine. The driving machine according to claim 9 , wherein the output of the motor is branched and transmitted to the first cam and the second cam .

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