JP2010228084A - Spring type fastener driving machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spring type fastener driving machine for reducing reaction when driving a fastener such as a staple. <P>SOLUTION: Since a plunger 62 of this spring type fastener driving machine 1 is constituted of a resin mold including a contour part body (a hollow body) 62f, mass can be remarkably reduced, and the reaction in driving is remarkably reduced. A plurality of rib parts 62d are formed in parallel on an outer peripheral surface of the resin contour part body 62f of the plunger, and since a plurality of guide grooves 25 engaging with the rib parts 62d are formed in a housing 2, when pushing up a resin mold 62 of the plunger by motor driving, the moment generated since a central part of the plunger resin contour part body 62f and driving projection parts 62a and 62b are eccentric, can be dispersed by the plurality od rib parts 62d. Thus, durability of the rib parts 62d the guide groove parts 25 can be maintained. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a stopper driving machine for driving stoppers such as nails, scissors, staples and the like to a driven material, and in particular, a driver attached to a plunger by releasing a plunger biased by a compression spring. The present invention relates to a spring-type stopper driving machine for driving a stopper by applying an impact force by a compression spring to a blade.

  Conventionally, as disclosed in Patent Document 1, the plunger is urged and accelerated by using the elastic force of a spring to fasten nails, scissors, staples and other fasteners such as wood and gypsum board (processed) A spring-type stopper driving machine for driving into a material is known. In this type of driving machine, elastic energy is accumulated in the spring by a built-in electric motor.

  Accumulation of elastic energy in the spring is performed by compressing or extending the spring, particularly in a coil spring, and the operation of this spring is linked via a motor and a reduction gear, and is driven to a position eccentric from the center of rotation. Is achieved by disposing a fixed rotating body, engaging a driving pin of the rotating body with an engaging protrusion formed on the plunger, and pushing up the plunger by a predetermined stroke.

Japanese Examined Patent Publication No.7-115307

  In the conventional spring-type stopper driving machine, the present inventors have found that there are the following problems as a result of experimentally examining the structure of the plunger.

  That is, the coil spring compressed by the motor is released at the time of driving, and the plunger is rapidly accelerated by the compressed spring energy, and the stopper is struck through the driver blade (driver bit). A reaction occurs in which the driving machine main body is moved in the direction opposite to the direction in which the plunger is struck. This reaction tends to increase as the mass of the movable portion such as the plunger to be accelerated increases. In the conventional spring-type stopper driving machine, the plunger is made of a relatively heavy member such as a metal material, which causes a large reaction during driving. Especially when increasing the volume of the movable part to increase the strength of the movable part, or when increasing the spring size to increase the spring energy required for driving in consideration of the size of the fastener, The reaction force increases because the mass increases.

  When the reaction force is large, the spring-type stopper driving machine is lifted, and a phenomenon occurs in which the stopper cannot be sufficiently driven into the workpiece. Furthermore, the user of the spring-type stopper driving machine has a problem that the impact force transmitted to the wrist is increased, and a burden is imposed on the driving operation. Such recoil can be reduced to some extent by increasing the mass of the entire product of the driving machine with respect to the mass of the movable part, but the product itself becomes heavy, so the workability of the user is deteriorated. This will cause problems.

  Accordingly, an object of the present invention is to provide a spring-type stopper driving machine that eliminates the above-mentioned problems and reduces the reaction at the time of driving the stopper.

  In order to achieve the above object, the outline of typical ones of the inventions disclosed in the present application will be described as follows.

  According to one aspect of the present invention, a housing, a plunger housed in the housing and biased in the driving direction of the stopper by a spring, and a stop transferred from the magazine mounted on the housing to the nose portion. A driving blade that is driven via a driver blade fixed to the plunger so as to strike the tool by the elastic force of the spring, a driving projection formed on the plunger, and a speed reduction mechanism that reduces the rotational force of the motor And a driving rotator for engaging the driving protrusion and moving the plunger so that the spring is compressed or released in the biasing direction. In the machine, the plunger is formed of a resin molded body, and the resin molded body is formed of a resin material so as to include a part of the spring extending in the urging direction. Comprising a resin outer shell body which, and a driving projection which forms the drive protrusion protruding from one peripheral surface of the resin outer shell body.

  According to another feature of the present invention, the drive protrusion protruding from the one outer peripheral surface of the resin shell main body includes a resin protrusion formed of a resin material and a metal material that covers a side surface of the resin protrusion. It is comprised from the cover part formed by.

  According to still another aspect of the present invention, the driving protrusion is formed by a metal member embedded in the resin shell main body.

  According to still another feature of the present invention, the resin shell main body is formed integrally with the resin shell main body on an outer peripheral surface other than the one outer peripheral surface, and extends along a moving direction of the driver blade. The housing having an existing rib portion and housing the resin shell main body has a guide groove that engages with the rib portion.

  According to still another aspect of the present invention, a plurality of the rib portions are formed in parallel, and the housing has a plurality of guide grooves that engage with the plurality of rib portions.

  According to still another feature of the present invention, the resin molded body further includes a connection protrusion that protrudes from an outer peripheral surface other than the one outer peripheral surface of the resin outer shell main body and is connected to the driver blade, The connecting projection is composed of a plurality of connecting projections arranged in the moving direction of the driver blade and integrally formed with the resin outer shell main body and a resin material.

According to still another aspect of the present invention, the plurality of connection protrusions include a cover portion formed of a metal material that covers a side surface of the connection protrusion.
According to still another aspect of the present invention, a through hole into which a guide shaft is inserted is provided at the center of the bottom of the resin shell main body, and the resin shell main body can reciprocate along the shaft. Configured as follows.

  According to one configuration of the present invention, since the plunger is formed of a resin molded body, for example, since the density of the resin molded body can be 20% or less of the steel material, the mass of the plunger can be reduced. it can. As a result, reaction during driving can be suppressed without increasing the mass of the product itself of the driving machine.

  According to the other configuration of the present invention, the drive protrusion has a structure in which the side surface of the resin protrusion is covered with a metal material or the drive protrusion itself is made of a metal material, so that the strength of the drive protrusion is ensured. be able to.

  According to still another configuration of the present invention, since the outer peripheral surface of the resin shell portion main body of the plunger resin molded body has the rib portion that engages with the guide groove of the housing, the plunger can be directly guided by the housing. . Thereby, it is not necessary to provide a separate guide member, and the number of parts can be reduced. As a result, the mass of the product body can be reduced and the product can be manufactured at low cost.

  According to still another configuration of the present invention, a plurality of rib portions are formed in parallel on the outer peripheral surface of the resin shell portion main body of the plunger, and a plurality of guide grooves engaging with the rib portions are formed in the housing. Therefore, when the resin molded body of the plunger is pushed up by driving the motor, the moment generated due to the eccentricity of the central portion of the plunger resin outer shell main body and the drive projection can be dispersed by the plurality of rib portions. it can. For this reason, durability of a rib part and a guide groove part can be improved.

  According to still another configuration of the present invention, a plurality of connecting projections that are connected to the driver blade are formed on the outer peripheral surface of the resin outer shell main body of the plunger in the moving direction of the plunger. The contact area of the protruding portion to be increased can be increased. As a result, when the driver blade is driven, the impact load received from the driver blade can be dispersed, and the durability of the connecting projection can be improved and the life of the spring stopper driving machine can be extended.

  The above and other objects, and the above and other features of the present invention will become more apparent from the following description of the present specification and the accompanying drawings.

  Hereinafter, an embodiment in which the present invention is applied to a spring-type stopper driving machine for driving staples will be described with reference to the drawings. FIG. 1 is an overall cross-sectional view (side view) of a spring-type stopper driving machine, and FIG. 2 is a cross-sectional view (plan view) showing a plunger compression mechanism in the spring-type stopper driving machine shown in FIG. FIG. 3 is a cross-sectional view (side view) of the main part showing the compression mechanism of the plunger in the spring-type fastener driving machine shown in FIG. 2, and FIG. 4 is the spring-type fastener shown in FIG. A front view of a plunger is shown in a driving machine, respectively.

  Note that components and elements having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiments, and the repetitive description thereof is omitted. In addition, for the sake of convenience, a direction in which a plunger, which will be described later, is defined as a vertical direction, and a direction in which the plunger is urged by a spring, which will be described later, to hit a stop is defined as a downward direction.

  As shown in FIG. 1, the spring-type stopper driving machine 1 is an electric type that drives the compression mechanism portion 5 related to the plunger 62 by the electric motor 3, and the staple 9 (see FIG. 3) that is a stopper. This is a tool for driving into a workpiece W such as wood. The spring-type fastener driving machine 1 includes a motor housing portion 24, a body housing portion 23, and a handle housing portion 21 that is branched from an upper end portion of the body housing portion 23 so as to be orthogonal to the body housing portion 23. And a housing 2 composed of: The housing 2 is made of a resin such as nylon or polycarbonate, and is configured to reduce the overall weight of the spring-type stopper driving machine 1. The housing 2 can be divided into two parts in the vertical direction in the direction crossing the plane of FIG. 1. After the components are assembled into the housing 2 divided into two parts, the two parts are fixed with screws (not shown). Assembled by.

  A battery pack (storage battery) 22 is detachably mounted so as to connect one end portions of the handle housing portion 21 and the motor housing portion 24 to each other, and the electric motor is driven by the battery pack 22 via a trigger switch 21a described later. 3 is supplied with driving power. A nose portion (injection portion) 7 is provided at the lower end portion of the body housing portion 23, and the connected staples 9 (see FIG. 3) are loaded in the nose portion 7, and the staples 9 are nose portions one by one. A magazine 8 is provided for supply to 7.

  A trigger switch 21 a for controlling the rotation of the electric motor 3 housed in the motor housing portion 24 is attached to the handle housing portion 21. The trigger switch 21a activates the electric motor 3 and enables rotation control by performing a retraction operation against the urging force of the trigger urging spring 21b.

The electric motor 3 is accommodated in the motor housing part 24, and the axial direction of the rotation output shaft is arranged in a direction orthogonal to the vertical movement direction of the plunger.
The speed reduction mechanism portion 4 is housed from the motor housing portion 24 to the fuselage housing portion 23 and is engaged with the planetary gear portion 41 meshed with the rotation output shaft of the electric motor 3 and the rotation output shaft of the planetary gear portion 41. And a spur gear portion including the final gear 42. This is constituted by so-called two-stage gear reduction.

  The compression mechanism section 5 is housed in the body housing section 23, and includes a first pin 51a and a second pin 51b that push up a plunger 62, which will be described later, and a roller 52 that is rotatably attached to each of the pins 51a and 51b. The The pins 51a and 51b are installed at two positions with an interval of 120 degrees in the eccentric position of the side surface of the final gear 42. As the final gear 42 rotates, the pins 51 a and 51 b move on concentric orbits and sequentially engage with the first drive protrusion 62 a and the second drive protrusion 62 b of the plunger 62, and the plunger 62 is dragged by the coil spring 61. On the contrary, it pushes up in two steps. As a result, the coil spring 61 is compressed and accumulates spring energy.

  The first drive protrusion 62a and the second drive protrusion 62b are provided at positions facing the surface on the side of the final gear 42, respectively, and a rotation track of a roller 52 rotatably attached to the pins 51a and 51b of the final gear 42, respectively. It arrange | positions so that it may engage and pushes up the plunger 62 upwards in two steps against the drag of the coil spring 61 as mentioned above. When the first pin 51a and the second pin 51b (roller 52) are engaged with the first drive protrusion 62a and the second drive protrusion 62b (protrusion member 63), the roller 52 is a protrusion made of a metal material. Contact the member 63. Accordingly, since the resin protrusions (62a, 62b) of the plunger 62 do not directly contact the roller 52, the resin protrusions can be prevented from being damaged. When the rotation of the final gear 42 further rotates and the second pin 51b reaches the top circular arc track, the engagement with the second drive protrusion 62b is released, and the accumulated energy of the compressed coil spring 61 is released together with the plunger 62. The staple 9 is driven by applying a striking force to the driver blade 64 mounted on the plunger 62.

  The coil spring 61 is accommodated in the body housing part 23. A washer 71a and an elastic body 72a are provided at one end of the coil spring 61, and similarly, a washer 71b and an elastic body 72b are provided at the other end of the coil spring 61. These elastic bodies 72a and 72b are formed in a cylindrical shape, and absorb the shock of the coil spring 61 when the both ends of the coil spring 61 are separated from the seating position by surging and the landing operation is repeated.

  The plunger 62 is housed in the body housing portion 23 and is located on the lower end side of the coil spring 61, and has a function of transmitting the accumulated energy when the coil spring 61 is compressed to the driver blade 64 as an impact force.

  The plunger 62 is formed of a resin molded body made of a resin material such as nylon according to the present invention. The density of the resin molded body (62) is selected to be 20% or less, for example, compared with the density of a steel material forming a normal plunger. As shown in FIG. 2 or FIG. 3, the resin molded body (plunger) 62 includes a resin outer portion main body 62f that encloses a part on the lower end side of the coil spring 61 that extends in the spring biasing direction, and the resin outer portion 62f. The protrusions 62a and 62b project from the outer peripheral surface 62g of the main part 62f and engage with the roller 52 of the final gear 42, and project from the outer peripheral surface 62h opposite to the outer peripheral surface 62g of the resin shell main part 62f. A connecting projection 62c connected to the driver blade 64 and a rib 62d formed in the moving direction of the plunger 62 on a pair of outer peripheral surfaces of the outer shell main body 62f facing each other are provided.

  The resin shell main body 62f is provided with a shaft through hole 62i into which the guide shaft 68 is inserted at the center of the bottom thereof so that the resin shell main body 62f can reciprocate along the shaft 68. It is configured. Further, as shown in FIG. 3, the resin shell main body 62 f is provided with a spring connection hole 62 e that is positioned below the coil spring 61 and supports the lower end of the coil spring 61.

As shown in FIG. 2, the rib portion 62d is slidably engaged with the guide groove 25 formed in the body housing portion 23, and restricts the movement of the plunger 62 in one direction.
A plurality of the connecting projections 62c are arranged in the moving direction (extending direction) of the driver blade 64, which will be described later, and are integrally formed with the resin shell main body 62f and the resin material. The resin shell main body 62 f of the plunger 62 is mechanically connected to the driver blade 64 through a connection hole 64 a provided in the driver blade 64. By providing a plurality of the connecting projections 62c, the resin outer shell main body 62f can increase the contact area with the driver blade 64, so that the impact load from the driver blade 64 can be received in a distributed manner when driven.

  As shown in FIGS. 3 and 4, the drive protrusions 62a and 62b are protrusion members 63 made of a metal material such as a steel material so as to cover at least a portion of the side surface of the resin protrusions 6262a and 62b that contacts the roller. Have By attaching the cover projection member 63 made of a metal material, the wear or damage of the drive projections 62a and 62b is protected when engaged with the roller 52.

  Further, as shown in FIGS. 5 and 6 as a first modification, the drive protrusions 62a and 62b are entirely formed by a protrusion member 63 made of steel and embedded in the resin outer shell main body 62f. As a result of the integration, the driving protrusions 62a and 62b can be replaced with the metal member 63 to further improve the strength of the driving protrusion. In particular, since the entire drive protrusion is integrated with metal, the strength of the drive protrusion against bending stress can be greatly improved. Therefore, in the case where the plunger 62 is formed of resin and protrudes from one outer peripheral surface of the outer shell main body to form the drive protrusion, a more remarkable effect can be obtained by the configuration shown in FIGS. .

  As shown in FIG. 7, the driver blade 64 is made of an elongated plate-shaped steel material. A plurality of connecting holes 64 a are arranged in the moving direction (extending direction) of the driver blade 64. The plunger 62 is coupled to the driver blade 64 by fitting or embedding the plurality of coupling projections 62c of the resin outer shell main body 62f into the plurality of coupling holes 64a.

  A bumper 65 formed of a resin material such as soft rubber or urethane is provided below the plunger (resin molded body) 62 in the body housing portion 23. Further, a bumper holder 66 and an adjuster 67 are provided below the bumper 65. The bumper holder 66 has a threaded portion 66 a that holds the outer peripheral side surface and the lower end surface of the bumper 65 and is screwed with the adjuster 67. A part of the outer peripheral surface of the adjuster 67 is exposed from the body housing portion 23 and is arranged so as to be rotatable from the outside of the body housing portion 23. By rotating the adjuster 67, the bumper holder 66 can be moved up and down to adjust the position of the bumper 65 up and down.

  The shaft 68 is disposed at the central portion of the coil spring 61, the lower end thereof is in contact with the bumper 65, and the upper end is attached to the body housing portion 23 through the shaft biasing spring 69 with a certain amount of clearance. The shaft 68 is always urged downward by a shaft urging spring 69 to press the bumper 65 against the bumper holder 66. Since there is a predetermined amount of gap due to the shaft biasing spring 69 between the shaft 68 and the body housing portion 23, the vertical movement of the bumper 65 due to the turning operation of the adjuster 67 is caused by a certain amount of gap provided at the upper end of the shaft 68. Only minutes can be tolerated.

The nose portion 7 is disposed below the coil spring portion 6. An injection hole through which the blade 64 passes is formed in the nose portion 7.
The magazine 8 is located below the motor housing portion 24 and is loaded with a plurality of staples 9. The staples 9 are sequentially supplied from the magazine 8 into the ejection holes provided in the nose portion 7 by a feeding mechanism (not shown) provided in the magazine 8.

  Next, the driving operation of the spring-type stopper driving machine 1 will be described. In order to drive the staple 9 into the driven material W, an operator holds the handle housing portion 21 to hold the driving machine 1 so as to be substantially orthogonal to the upper surface of the driven material W, The electric motor 3 is rotated by pulling the trigger switch 21a. The rotational force of the electric motor 3 is transmitted to the final gear 42 by the speed reduction mechanism 4 and moves the plunger 62 upward via the roller 52 of the compression mechanism 5 provided on the side surface of the final gear 42. By moving the plunger 62 upward against the urging force of the coil spring 61, the coil spring 61 is compressed and elastic energy (spring energy) is accumulated in the coil spring 61.

  When the plunger 62 is pushed up to the maximum (top dead center), the roller 52 (first pin 51a, second pin 51b) in the compression mechanism 5 and the protrusion member 63 (first drive protrusion 62a, second). Since the engagement with the drive projection 62b) is released, the elastic energy accumulated in the coil spring 61 is released and the plunger 62 is suddenly pushed down, and the staple 9 supplied from the magazine 8 into the nose 7 by the driver blade 64 is loaded. The staple 9 is driven into the workpiece W.

  According to the embodiment of the spring-type stopper driving machine 1 as described above, the plunger 62 is composed of a resin molded body including the outer shell main body (hollow body) 62f, and therefore the mass can be remarkably reduced. As a result, since the magnitude of the reaction that the coil spring 61 receives from the plunger 62 when the coil spring 61 is released is proportional to the mass of the plunger 62, the reaction when the plunger 62 strikes the workpiece W together with the staple 9 is significantly reduced. be able to. As a result, the driving machine 1 can be prevented from rising during driving and the staple 9 can be driven sufficiently.

  Further, according to the above embodiment, since the outer peripheral surface of the resin shell main body 62f of the plunger resin molded body 62 has the rib portion 62d that engages with the guide groove of the housing, the plunger is formed by the housing 2 (body housing portion 23). 62 can be guided directly. Thereby, it is not necessary to provide a separate guide member, and the number of parts can be reduced. As a result, the mass of the product main body 1 can be suppressed and manufactured at low cost.

  Furthermore, according to the above-described embodiment, the plurality of rib portions 62d are formed in parallel on the outer peripheral surface of the resin outer shell main body 62f of the plunger, and the housing 2 has a plurality of guides that engage with the rib portions 62d. Since the groove 25 is formed, when the plunger resin molded body 62 is pushed up by motor driving, the moment generated due to the eccentricity of the central portion of the plunger resin outer shell main body 62f and the drive projections 62a and 62b is caused by a plurality of moments. It can disperse | distribute by the rib part 62d. For this reason, durability of the rib part 62d and the guide groove part 25 can be improved.

  Further, according to the above-described embodiment, the plurality of connecting projections 62c that are connected to the driver blade 64 are formed in the movement direction of the plunger 62 on the outer peripheral surface of the resin outer shell main body 62f of the plunger. It is possible to increase the contact area of the connecting projection 62c connected to the. As a result, when the driver blade 64 is driven, the impact load received from the driver blade 64 can be dispersed, and the durability of the connecting protrusion 62c can be improved and the life of the spring stopper driving machine 1 can be extended.

  In addition, in the said embodiment, the planar shape of the connection protrusion part 62c for connecting the plunger resin molding 62 and the driver blade 64 and the connection hole 64a other than the elliptical shape shown in FIG. As shown in FIG. 9, it may be a perfect circle.

  FIG. 8 and FIG. 9A show the outer periphery of the connection protrusion 62c having a perfect circle shape in order to make the connection protrusion 62c and the connection hole 64a have a planar shape and improve the strength of the connection protrusion 62c. A modified example in which a metal material protruding member (cover member) 63c is formed on the side surface portion to improve the strength will be described. By forming a cover member 63c made of a metal material on the outer peripheral side surface of the resin coupling projection 62c, the impact load applied from the driver blade 64 to the resin coupling projection 62c when driving staples, nails or the like is dispersed to disperse the coupling projection. Breakage of 62c can be prevented. In particular, it is advantageous when installing the driver blade 64 in a spring-type stopper driving machine that requires a large striking force. Further, as shown in FIG. 9B, in the spring-type fastener driving machine with a relatively low striking force, the cover member 63c made of a metal material is omitted, and the driver blade 64 is directly connected to the connecting protrusion 62c. May be.

  Furthermore, as shown in FIG. 10, a large number of connection protrusions 62 c and connection holes 64 a can be provided to strengthen the connection between the plunger resin molded body 62 and the driver blade 64. In the example illustrated in FIG. 10, the connection protrusion 62 c and the connection hole 64 a are arranged at three locations along the vertical movement direction of the plunger 62. Also in this case, as shown in FIG. 10A, the strength of the connecting projection 62c can be reinforced by forming a cover member 63c made of a metal material.

  With the above-described configuration, it is possible to disassemble and repair the driver blade 64 and the plunger 62 in the event of a failure while increasing the strength of the connecting projection 62c. Further, when it is required to strengthen the connection between the driver blade 64 and the plunger 62, the driver blade 64 may be embedded in the resin shell main body 62f and integrally molded.

  In the above-described embodiment, the case of a staple driving machine that drives staples as a stopper has been described. However, the same effect can be obtained even when applied to a spring-type stopper driving machine that uses a nail as a stopper.

  As mentioned above, the invention made by the present inventor has been specifically described based on the embodiments. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention. .

1 is an overall cross-sectional view (side view) of a spring-type fastener driving machine according to an embodiment of the present invention. Sectional drawing (plan view) of the principal part which shows the plunger of the spring-type fastener driving device shown in FIG. Sectional drawing (side view) of the principal part which shows the plunger of the spring-type stopper driving machine shown in FIG. The front view of the plunger shown in FIG. The principal part sectional drawing (side view) which shows the 1st modification of the plunger in the spring-type fastener driving device shown in FIG. The front view which shows the 1st modification of the plunger shown in FIG. FIG. 4 is a rear view of a plunger of the spring-type stopper driving machine shown in FIG. 3. The principal part sectional drawing (side view) which shows the 2nd modification of the plunger in the spring-type fastener driving device shown in FIG. The rear view of the plunger shown in FIG. The rear view which shows the 3rd modification of the plunger in the spring-type stopper driving device shown in FIG.

1: Spring-type stopper driving device 2: Housing 21: Handle housing portion 21a: Trigger switch 21b: Trigger bias spring 22: Battery pack 23: Body housing portion 24: Motor housing portion 25: Guide groove 3: Electric motor 4 : Deceleration mechanism part 41: Planetary gear part 42: Final gear 5: Compression mechanism part 51a: First pin 51b: Second pin 52: Roller 6: Coil spring part 61: Coil spring 62: Plunger 62a: First drive protrusion 62b: Second drive projection 62c: coupling projection 62d: rib 62e: spring coupling hole 62f: resin shell main body 62g: one outer circumferential surface 62h: other outer circumferential surface 62i: shaft penetration hole 63, 63c: projection Member (Metal member)
64: Driver blade 64a: Connection hole 65: Bumper 66: Bumper holder 66a: Screw part 67: Adjuster 68: Shaft 69: Shaft biasing spring 7: Nose part 71a, 71b: Washer 72a, 72b: Elastic body

Claims (8)

A housing, a plunger housed in the housing and biased in a driving direction of the stopper by a spring, and a stopper transferred from the magazine mounted on the housing to the nose portion are driven out by the elastic force of the spring. A driver blade fixed to the plunger, a drive protrusion formed on the plunger, and a drive rotating body driven by a speed reduction mechanism that decelerates the rotational force of the motor, wherein the spring is biased In a spring-type fastener driving machine comprising: a driving rotator for engaging the drive projection and moving the plunger so that it is compressed or released in a direction;
The plunger is formed of a resin molded body, and the resin molded body includes a resin shell main body formed of a resin material so as to include a part of the spring extending in a biasing direction, and the resin shell main body. And a drive projection that protrudes from one outer peripheral surface of the drive projection to form the drive projection.   The drive protrusion protruding from the one outer peripheral surface of the resin shell main body includes a resin protrusion formed of a resin material and a cover formed of a metal material that covers a side surface of the resin protrusion. 2. The spring-type fastener driving machine according to claim 1, wherein   2. The spring-type fastener driving machine according to claim 1, wherein the drive protrusion is formed of a metal member embedded in the resin shell main body.   The resin outer shell main body has a rib portion that is integrally formed with the resin outer shell main body on an outer peripheral surface other than the one outer peripheral surface, and extends along a moving direction of the driver blade. The spring-type fastener driving machine according to any one of claims 1 to 3, wherein the housing that houses the main part has a guide groove that engages with the rib part.   The spring-type fastener driving machine according to claim 4, wherein a plurality of the rib portions are formed in parallel, and the housing has a plurality of guide grooves that engage with the plurality of rib portions.   The resin molded body further includes a connecting protrusion that protrudes from the outer peripheral surface other than the outer peripheral surface of the resin outer shell main body and connects to the driver blade, and the connecting protrusion moves the driver blade. 6. The apparatus according to claim 1, comprising a plurality of connecting projections arranged in a direction and integrally formed with the resin outer shell main body and a resin material. A spring-type fastener driving machine.   The spring-type fastener driving machine according to claim 6, wherein the plurality of connecting protrusions include a cover part formed of a metal material that covers a side surface of the connecting protrusion.   A through hole into which a guide shaft is inserted is provided at the center of the bottom of the resin shell main body, and the resin shell main body is configured to reciprocate along the shaft. Item 8. The spring-type fastener driving machine according to any one of items 7 to 9.

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