JP2017213634A - Placing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a placing machine in which an increase in a size of a bumper in a radial direction can be suppressed.SOLUTION: A placing machine having: a striking element 12 for striking a nail; a housing in which the striking element 12 is so located as to be capable of being reciprocated; and a bumper 33 which is provided in the housing, and with which the striking element 12 collides when the striking element 12 is operated in a nail striking direction. The placing machine comprises a hole 34 which is provided in the bumper 33 and in which the striking element 12 is movably located, and a pressure reception part 87 which is provided in teh housing and receives a load when the striking element 12 collides with the bumper 33. An open width L1 of the hole 34 in a first direction A2 in a plan view perpendicular to an operation direction of the striking element 12 is larger than an open width L2 of the hole 34 in a second direction A3 at a right angle to the first direction A2, and a width of the pressure reception part 87 in a radial direction of the hole 34 in a plan view is constant over the while circumference of the hole 34.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a driving machine that hits a stopper with a hammer and drives the stopper into a workpiece.

  A driving machine for driving a stopper into a material to be driven is described in Patent Document 1. The driving machine described in Patent Document 1 is operable along a housing, a cylindrical guide member provided in the housing, a bumper provided in the housing, a bellows arranged in the housing, and the guide member And a striking child. The striker has a piston and a driver blade fixed to the piston. A first end of the guide member in the central axis direction is connected to the housing. 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 compression chamber.

  The housing includes a wall portion, and the bumper is supported by the wall portion. The wall portion extends in the radial direction of the guide member, and the wall portion is connected to a second end portion in the central axis direction of the guide member. An injection part is provided outside the housing, and the injection part is fixed to the partition wall. An injection path is provided in the injection unit. The magazine is attached to the injection unit, and the stopper accommodated in the magazine is supplied to the injection path.

  Furthermore, the driving machine described in Patent Document 1 includes a motor provided in the housing, a gear that transmits the rotational force of the motor to the cam, a protrusion provided on the cam, a locking portion provided on the piston, And a bumper provided in the housing. The bumper is made of resin, and a hole is provided in the bumper. The driver blade is movable in the hole of the bumper. Furthermore, the driving machine described in Patent Document 1 includes a push rod that is movable with respect to the housing and a trigger that is operated by an operator.

  When the motor is stopped, the striker is stopped at the bottom dead center because the piston is pressed against the bumper by the pressure of the compression chamber. When the push rod is pressed against the material to be driven and the trigger is operated, the cam is rotated by the rotational force of the motor and the protrusion is engaged with the locking portion, and the impactor is moved from the bottom dead center by the rotational force of the cam. Move toward top dead center. While the striker moves from the bottom dead center toward the top dead center, the bellows is compressed and the pressure in the compression chamber rises.

  When the striker reaches top dead center, the protrusion is separated from the locking portion, and the rotational force of the cam is not transmitted to the striker. For this reason, the striker moves from the top dead center toward the bottom dead center by the pressure of the compression chamber. As a result, the driver blade strikes the stopper located in the injection path and drives the stopper into the driven material. Next, when the striker collides with the bumper, the bumper bends and softens the impact. Further, the motor stops after the driver blade has driven the stopper into the driven material, and the striker stops at the bottom dead center where the piston contacts the bumper.

JP 2014-69289 A

  However, the driving machine described in Patent Document 1 discloses a motor and a link mechanism as a hoisting mechanism that winds up the striker from the bottom dead center toward the top dead center. However, these all disclose a structure provided around a bellows or the like in the housing, and the structure is inevitable to increase the size of the housing.

  Although not described in Patent Document 1, as a proposal for downsizing the housing part, a rack-like unevenness is provided on the driver blade part described above, and winding is performed by fitting with a pinion output from a motor Can be considered. However, in this case, since the diameter of the opening hole in the central portion of the bumper increases based on the diameter of the driver blade portion that penetrates the central portion of the bumper, there is a problem that the bumper becomes large in the radial direction.

  An object of the present invention is to provide a driving machine capable of suppressing the bumper from increasing in size in the radial direction as much as possible based on the above-described problems.

  The driving machine according to an embodiment includes an impactor that strikes a stopper, a housing in which the impactor is disposed so as to be reciprocally movable, and provided in the housing, and the impactor strikes the stopper. A bumper with which the striker collides when operated in a direction, provided in the bumper and provided in the housing, and a hole in which the striker is movably disposed And a pressure receiving portion that receives a load when the striker collides with the bumper, and the first opening width of the hole in the first direction in a plan view perpendicular to the operation direction of the striker Is larger than the second opening width of the hole in the second direction perpendicular to the first direction, and the width of the pressure receiving portion in the radial direction of the hole in the plan view is the entire circumference of the hole. It is constant over time.

  The driving machine according to the embodiment can suppress the bumper from being enlarged in the radial direction.

It is the half sectional view which looked at the driving machine from the side. It is the half sectional view which looked at the driving machine from the side. It is sectional drawing which looked at the driving machine from the front. (A), (B) is sectional drawing which shows the principal part of a driving machine. (A) is a top view of the bumper used for a driving machine, (B) is a bottom view of a bumper. (A), (B) is a perspective view of a bumper.

  An embodiment of a driving machine will be described with reference to the drawings.

  The driving machine 10 shown in FIGS. 1, 2, and 3 operates the housing 11, the striker 12 disposed from the inside of the housing 11 to the outside, and the striker 12 along the first direction B <b> 1. A pressure chamber 13, a winding mechanism 14 that moves the striker 12 along the second direction B <b> 2, and an electric motor 15 are provided.

  The housing 11 includes a cylindrical main body 16, a cover 17 in which an opening of the main body 16 is closed, a handle 18 and a motor accommodating portion 19 that are continuous with the main body 16, and a connecting portion that connects the handle 18 and the motor accommodating portion 19. 20 and. An accumulator vessel 21 and a cylinder 22 are provided in the housing 11. The pressure chamber 13 is formed in the pressure accumulation container 21. The pressure chamber 13 moves the striker 12 along the first direction B1 between the top dead center and the bottom dead center. The first direction B <b> 1 is an operation direction of the striker 12 and is a direction parallel to the axis A <b> 1 that is the center of the cylinder 22. The meaning of the top dead center and the bottom dead center of the striker 12 will be described later.

  The cylinder 22 is made of metal, and the cylinder 22 has a large-diameter portion 76, a small-diameter portion 77, and a tapered portion 78, as shown in FIGS. The tapered portion 78 is disposed between the large diameter portion 76 and the small diameter portion 77 in the direction of the axis A1. The tapered portion 78 connects the small diameter portion 77 and the large diameter portion 76. The small diameter portion 77 is disposed between the tapered portion 78 and the pressure chamber 13 in the direction of the axis A1. The inner diameter of the large diameter portion 76 is larger than the inner diameter of the small diameter portion 77.

  The inner diameter of the tapered portion 78 differs in the direction of the axis A1. The inner peripheral surface of the tapered portion 78 is inclined in a direction in which the inner diameter increases as the small diameter portion 77 approaches the large diameter portion 76. The taper portion 78 has a taper in a direction in which the inner diameter increases in both the front view and the side view of the driving machine 10. An annular connector 23 is provided in the main body 16, and the connector 23 connects the pressure accumulating container 21 and the small diameter portion 77 of the cylinder 22.

  The striker 12 has a piston 24 and a driver blade 25. The piston 24 is movably disposed in the small diameter portion 77 of the cylinder 22. The driver blade 25 is fixed to the piston 24. The piston 24 can reciprocate in the direction of the axis A <b> 1 with respect to the cylinder 22. The striker 12 is operable with respect to the cylinder 22 in the first direction B1 and the second direction B2. The first direction B1 and the second direction B2 are parallel to the axis A1, and the first direction B1 and the second direction B2 are opposite to each other.

  A seal member 79 is attached to the outer periphery of the piston 24, and the seal member 79 contacts the inner surface of the cylinder 22 to form a seal surface. The seal member 79 hermetically seals the pressure chamber 13. Compressed air is enclosed in the pressure chamber 13.

  The driver blade 25 is made of metal or resin, and the driver blade 25 has a narrow plate shape. The driver blade 25 is provided with a rack 26 along the longitudinal direction as shown in FIG. The rack 26 has a plurality of convex portions 26A and a concave portion 26B formed between the convex portions 26A. The convex portion 26A protrudes from the edge portion 26C of the driver blade 25. A plurality of the convex portions 26A are arranged at regular intervals in the direction of the axis A1.

  The piston 24 is circular in plan view perpendicular to the axis A1 as shown in FIG. The driver blade 25 has a rectangular cross-sectional shape in plan view perpendicular to the axis A1. The thickness t1 of the driver blade 25 in the first direction A2 is larger than the thickness t2 of the driver blade 25 in the second direction A3. The first direction A2 and the second direction A3 are perpendicular to each other. The first direction A2 is a direction in which the convex portion 26A protrudes from the edge portion 26C of the driver blade 25. When the driving machine 10 is viewed in plan, the second direction A3 is parallel to the axis A4. The axis A4 will be described later.

  A holder 28 is provided inside the main body 16. The holder 28 is made of an aluminum alloy or a synthetic resin. The holder 28 includes a cylindrical accommodating portion 80 and a bottom portion 81 that protrudes in the radial direction from the accommodating portion 80. The large-diameter portion 76 of the cylinder 22 is disposed in the accommodating portion 80, and the holder 28 and the cylinder 22 are connected so as not to rotate relative to each other. A boss portion 82 is provided in the main body 16, and the holder 28 is supported by the boss portion 82 via a buffer member 83. The buffer member 83 is integrally formed of a material such as resin, for example, soft rubber or urethane resin.

  An annular step portion 84 is formed on the inner periphery of the accommodating portion 80. The step portion 84 contacts the large diameter portion 76. As shown in FIG. 5B, the bottom 81 has a circular shape when viewed from the bottom perpendicular to the axis A1, and a hole 85 is provided through the bottom 81 in the direction of the axis A1. The hole 85 has a rectangular shape, a rectangular similar shape having no corners, an oval shape, an elliptical shape, or the like. In short, the opening diameter in one direction is different from the opening diameter in a direction orthogonal to the one direction. The driver blade 25 is movable in the direction of the axis A <b> 1 within the hole 85. In the bottom view of the holder 28, the axis A <b> 1 is located in the arrangement region of the holes 85.

  The bumper 33 is disposed over the cylinder 22 and the holder 28. The bumper 33 is integrally formed of a material such as resin, for example, soft rubber or urethane resin. The bumper 33 is supported by the cylinder 22 and the holder 28, and the bumper 33 is disposed in the tapered portion 78 and the large diameter portion 76.

  A hole 34 penetrating the bumper 33 in the direction of the axis A1 is provided. 5B, the opening width L1 in the first direction A2 is different from the opening width L2 in the second direction A3 when viewed from the bottom perpendicular to the axis A1. The opening width L1 is larger than the opening width L2. In the bottom view of the bumper 33, the axis A <b> 1 is located in the arrangement region of the holes 34.

  As shown in FIGS. 4A, 4B, and 6B, the bumper 33 includes a base 86 and a pressure receiving portion 87 that protrudes from the base 86 in the direction of the axis A1. Notches 88 are formed on both sides of the pressure receiving portion 87 in the second direction A3. The pressure receiving portion 87 has two planes 87A that are arranged with a predetermined width in the second direction A3 and are parallel to each other. In the base 86, a shoulder 89 is formed at a position opposite to the pressure receiving portion 87 in the direction of the axis A1, as shown in FIG. The shoulder 89 is arranged in an annular shape about the axis A1. The shoulder portion 89 is disposed inside the tapered portion 78, and the shoulder portion 89 is inclined so that the outer diameter increases as the pressure receiving portion 87 is approached. That is, the shoulder portion 89 is a tapered surface.

  The pressure receiving portion 87 has a contact surface 90 that contacts the bottom portion 81. The hole 34 opens in the contact surface 90. As shown in FIG. 5B, the contact surface 90 has a track shape in a bottom view perpendicular to the axis A1. The width of the contact surface 90 is substantially constant over the entire circumference. A space 91 is formed between the bottom 81 and the base 86 with the contact surface 90 in contact with the bottom 81. The space 91 is formed by a notch 88.

  A nose portion 35 is fixed to the main body 16 using a screw member, and the nose portion 35 has an injection path 36. The injection path 36 is a space or a passage, and the driver blade 25 can move in the direction of the axis A1 in the injection path 36.

  The electric motor 15 is provided in the motor housing portion 19, and the electric motor 15 transmits a rotational force to the winding mechanism 14. The electric motor 15 has a motor shaft 37, and the motor shaft 37 is rotatably supported by bearings 38 and 39. The motor shaft 37 is rotatable about the axis A4. In a side view of the driving machine 10 shown in FIG. 1, the axis A1 and the first direction A2 intersect at a right angle. As shown in FIG. 2, a detachable storage battery 40 is provided for the connection unit 20, and the storage battery 40 supplies power to the electric motor 15.

  The storage battery 40 includes a storage case 41 and battery cells stored in the storage case 41. The battery cell is a secondary battery that can be charged and discharged, and a lithium ion battery, a nickel hydride battery, a lithium ion polymer battery, or a nickel cadmium battery can be used as the battery cell. The storage battery 40 is a direct current power source. A first terminal is provided in the housing case 41, and the first terminal is connected to the battery cell. If a 2nd terminal is fixed to the connection part 20 and the storage battery 40 is attached to the connection part 20, a 1st terminal and a 2nd terminal will be connected so that electricity supply is possible.

  As shown in FIG. 1, the speed reducer 43 is provided in the motor housing portion 19. The reduction gear 43 includes an input member 44, an output member 45, and three sets of planetary gear mechanisms. The input member 44 is fixed to the motor shaft 37. The input member 44 and the output member 45 are rotatable about the axis A4. The rotational force of the motor shaft 37 is transmitted to the output member 45 via the input member 44. The speed reducer 43 reduces the rotation speed of the output member 45 relative to the input member 44.

  The hoisting mechanism 14 operates the striker 12 in the second direction B2 opposite to the first direction B1. The winding mechanism 14 includes a pin wheel shaft 48 and a pin wheel 49. The pin wheel shaft 48 is rotatably supported by bearings 46 and 47. The pin wheel 49 is fixed to the pin wheel shaft 48.

  A pinion 50 is provided on the pin wheel 49. The pinion 50 has a plurality of pins 50 </ b> A arranged at intervals in the circumferential direction of the pin wheel 49. The number of protrusions 26A and the number of pins 50A are the same, and each pin 50A can be engaged and released independently with respect to each protrusion 26A.

  A rotation control mechanism is provided in the main body 16. The rotation control mechanism transmits the rotational force of the motor shaft 37 to the pinwheel shaft 48 and prevents the rotational force of the pinwheel shaft 48 from being transmitted to the motor shaft 37.

  Further, a magazine 59 for accommodating the nail 58 is provided, and the magazine 59 is supported by the nose portion 35 and the connection portion 20. The magazine 59 has a feed mechanism that supplies the nail 58 to the injection path 36. A plurality of nails 58 are accommodated in the magazine 59 in a state where they are connected by a connector.

  The motor board 60 is provided in the motor housing portion 19, and the inverter circuit is provided on the motor board 60. The inverter circuit includes a plurality of switching elements, and the plurality of switching elements can be individually turned on and off.

  A control board 62 is provided in the connection unit 20, and a controller is provided on the control board 62. The controller is a microcomputer having an input port, an output port, a central processing unit, and a storage device. The controller is connected to the second terminal via a lead wire and connected to the inverter circuit via the lead wire.

  A trigger 66 is provided on the handle 18. The trigger 66 is operably attached to the handle 18. The operator applies an operating force to the trigger 66 by grasping the handle 18 by hand. A trigger switch 67 is provided in the handle 18, and the trigger switch 67 is turned on when an operating force is applied to the trigger 66 and turned off when the operating force of the trigger 66 is released.

  A push lever 68 is attached to the nose portion 35. The push lever 68 is movable with respect to the nose portion 35 in the direction of the axis A1. A push switch is provided in the nose portion 35. The push switch is turned on when the push lever 68 is pressed against the workpiece W1 as shown in FIG. 3, and turned off when the push lever 68 is released from the workpiece W1. A phase detection sensor that detects the phase in the rotational direction of the pin wheel 49 is provided in the housing 11. Signals from the trigger switch 67, push switch, and phase detection sensor are input to the controller, and the controller drives and stops the electric motor 15. The controller can process the signal of the phase detection sensor to estimate the position of the striker 12.

  Next, an operation in which the operator uses the driving machine 10 to drive the nail 58 into the driven material W1 will be described. When the trigger switch 67 is turned off and the push switch is turned off, the controller turns off all the switching elements of the inverter circuit. For this reason, the electric power of the storage battery 40 is not supplied to the electric motor 15, and the electric motor 15 is stopped.

  When the electric motor 15 is stopped, the striker 12 is stopped at a standby position below the top dead center. The top dead center is the position of the striker 12 in the direction of the axis A1 when the piston 24 comes closest to the pressure chamber 13. The striker 12 is urged toward the bumper 33 by the pressure of the pressure chamber 13.

  When the striker 12 is urged by the pressure of the pressure chamber 13 and the rack 26 and the pinion 50 are engaged, the pin wheel 49 receives a clockwise rotational force in FIG. The rotation restricting mechanism prevents the pin wheel 49 from rotating. That is, the rotation restricting mechanism stops the striker 12 at the standby position and prevents the rotational force of the pin wheel 49 from being transmitted to the motor shaft 37. When the striker 12 is stopped at the standby position, the piston 24 is separated from the bumper 33.

  When the controller detects that the trigger switch 67 is turned on and the push switch is turned on, the controller repeats control to turn on and off the switching elements of the inverter circuit, and supplies the electric power of the storage battery 40 to the electric motor 15. Then, the motor shaft 37 of the electric motor 15 rotates, and the rotational force of the motor shaft 37 is transmitted to the pin wheel shaft 48 via the speed reducer 43.

  Then, the pin wheel 49 rotates counterclockwise in FIG. 3, and the striker 12 operates in the second direction B <b> 2 by the engagement force between the pinion 50 and the rack 26. That is, the striker 12 operates toward the top dead center against the force of the pressure chamber 13, and the air pressure in the pressure chamber 13 increases. When the striker 12 reaches top dead center, the pinion 50 is released from the rack 26. Then, the striker 12 moves toward the bumper 33 with the air pressure of the pressure chamber 13, and the driver blade 25 strikes the nail 58 in the injection path 36, and the nail 58 is driven into the driven material W1.

  Further, the piston 24 collides with the bumper 33 as shown in FIGS. 4A and 4B after the nail 58 is driven into the driven material W1. The load received by the bumper 33 is transmitted to the main body 16 through the holder 28. Further, the bumper 33 absorbs the kinetic energy of the striker 12 by elastic deformation. The state where the piston 24 collides with the bumper 33 and the piston 24 is farthest from the pressure chamber 13 in the direction of the axis A1 is the bottom dead center of the striker 12.

  Further, the motor shaft 37 of the electric motor 15 rotates even after the driver blade 25 hits the nail 58. For this reason, the pinion 50 engages with the rack 26, and the striker 12 operates from the bottom dead center toward the top dead center. The controller stops the electric motor 15 when the striker 12 reaches the standby position. When the electric motor 15 stops, the rotation control mechanism holds the striker 12 at the standby position.

  The action when the piston 24 collides with the bumper 33 will be described in detail. When the piston 24 collides with the bumper 33, the bumper 33 is elastically deformed by receiving a compressive load in the direction of the axis A1 between the piston 24 and the bottom portion 81 of the holder 28. Specifically, a part of the bumper 33 expands in the radial direction and is pressed against the inner surface of the tapered portion 78 and the inner surface of the large diameter portion 76. In addition, a part of the bumper 33 is deformed so as to approach the bottom 81, and the space 91 becomes narrow. To do. Further, the pressure receiving portion 87 is pressed against the bottom portion 81.

  Of the bumper 33, the contact surface 90 pressed against the bottom 81 has a track shape as shown in FIG. 5B, and the width of the contact surface 90 is substantially constant over the entire circumference. Therefore, the concentration of stress on a part of the bumper 33 can be alleviated.

  In the hole 34 in which the driver blade 25 is movably disposed, the opening width L1 and the opening width L2 are different as shown in FIG. That is, the planar shape of the hole 34 approximates the planar shape of the driver blade 25. For this reason, by adopting the hole 34 of the present embodiment, an area where the bumper 33 receives a load can be secured, and an increase in the outer diameter of the bumper 33 can be suppressed.

  The meaning of the matters described in the embodiment will be described. The nail 58 is a stopper, the first direction A2 is the first direction, the second direction A3 is the second direction, and the opening width L1 is the first opening width. The opening width L2 is the second opening width, the thickness t1 is the first thickness, the thickness t2 is the second thickness, the electric motor 15 is a motor, and the pressure chamber 13 is It is a striking mechanism, and the cylinder 22 is a cylindrical member.

  The driving machine is not limited to the above embodiment, and various changes can be made without departing from the scope of the driving machine. For example, the standby position of the striker is not limited to the state where the piston is separated from the bumper, but the state where the piston is stopped by the bumper can be grasped as the standby position of the striker. It is also possible to provide a bellows in the housing and connect the bellows and the piston to form a pressure chamber in the bellows.

  Further, the striking mechanism that applies a biasing force to the striking element may be either a structure that operates the striking tool with air pressure or a structure that operates the striking tool with the force of an elastic member. The elastic member may be either a synthetic rubber or a metal spring. The metal spring may be either a compression spring or a tension spring. When using a bellows or using a metal spring, a guide member for guiding the operation of the striker may be a rail instead of a cylinder.

  The driver blade may be any of a narrow plate shape, a rod shape, and an axial shape. Further, the pinion may be a gear. Further, the cylindrical member that houses the bumper may be the holder itself.

  Motors that move the striker away from the bumper include an electric motor, a hydraulic motor, a pneumatic motor, and an internal combustion engine. The electric motor may be either a brush motor or a brushless motor. The power source of the electric motor may be either a DC power source or an AC power source. When an AC power source is used as a power source, the driving machine and an AC power source outlet are connected by a power cable.

  The stopper driven into the workpiece by the driving machine includes a U-shaped stopper in addition to the shaft-shaped nail. The nail includes a nail having a head and a nail having no head. The injection part to which the stopper is supplied has an injection path through which the stopper and the impact tool move. The injection path includes a space, a hole, a groove, and a recess. The workpieces include floors, walls, ceilings, columns, and roofs. The material of the material to be driven includes wood, concrete, and plaster.

  DESCRIPTION OF SYMBOLS 10 ... Driving machine, 11 ... Housing, 12 ... Strike element, 13 ... Pressure chamber, 15 ... Electric motor, 22 ... Cylinder, 26 ... Rack, 33 ... Bumper, 34 ... Hole, 50 ... Pinion, 58 ... Nail, 78 ... Tapered portion, 87 ... Pressure receiving portion, 89 ... Shoulder portion, A2 ... first direction, A3 ... second direction, L1, L2 ... opening width, t1, t2 ... thickness.

Claims (6)

A striking element that strikes a stopper, a housing in which the striking element is reciprocally movable, and a bumper that is provided in the housing and collides after the striking element strikes the stopper. An embedded machine,
A hole provided in the bumper and in which the striker is movably disposed;
A pressure receiving portion provided in the housing and receiving a load when the striker collides with the bumper;
With
The first opening width of the hole in the first direction is larger than the second opening width of the hole in the second direction perpendicular to the first direction in a plan view perpendicular to the operation direction of the striker. big,
The driving machine in which the width of the pressure receiving portion in the radial direction of the hole is constant over the entire circumference of the hole in the plan view.   2. The driving machine according to claim 1, wherein, in the plan view, a first thickness of the striker in the first direction is larger than a second thickness of the striker in the second direction.   The driving machine according to claim 2, wherein a rack that performs at least a part of the reciprocation is provided at an edge of the striker in the first direction. A motor provided in the housing;
A pinion that rotates with the rotational force of the motor and engages the rack;
The driving machine according to claim 3, comprising: A striking mechanism for applying a biasing force in a direction to bring the striking element closer to the stopper is provided,
The striker is
When the pinion rotates while engaged with the rack, it operates against the biasing force,
The driving machine according to claim 4, wherein when the pinion is released from the rack, the driving device hits the stopper by operating with the biasing force. A cylindrical member provided in the housing and accommodating the bumper;
A tapered portion provided on the cylindrical member and inclined with respect to the operation direction of the striker;
A shoulder provided on the bumper and inclined in the same direction as the tapered portion;
The driving machine according to any one of claims 1 to 5, further comprising:

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