JP2008049440A - Connecting/disconnecting structure of contact member in nailing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent connection and disconnection of a contact top itself when a fastener is loaded. <P>SOLUTION: It is possible to connect and disconnect the contact top 8 to and from a tip end of a contact arm 11 in drawing out an additional stroke quantity exceeding a stroke quantity in reciprocal motion of the contact arm 11 and to draw out the additional stroke quantity of the contact arm 11 only when no nail is loaded in this connecting/disconnecting structure of a contact member on the nailing machine to connect and disconnect the contact top 8 to and from the tip end of the contact arm 11 by providing the contact arm 11 free to reciprocally move within a specified stroke quantity in parallel with the nailing direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a structure for attaching and detaching a contact member disposed at the tip of a nose portion for driving out the nail, screw and the like in a nailing machine used for driving a nail and a screw.

  The nailing machine is used to drive nails, screws and the like into a material to be driven, and is provided with a contact arm as a safety device. As for the contact arm, one end of the contact arm protrudes from the tip of the injection port of the nailing machine, and the other end is arranged so as to be linked with the trigger for starting, and when the trigger is pulled, the one end of the contact arm is placed on the driven material. It is known that the nailer is configured to operate only when hit.

  The contact arm is normally spring-biased so as to protrude in the driving direction from the tip of the nose portion, and when the nail is driven, the tip of the contact arm is covered until the tip of the nose hits the driven material. It moves to the side opposite to the pressing direction by pressing against the driving material, and this movement detects that the tip of the nose portion has been applied to the driving material and makes the trigger operation effective. .

  Incidentally, a contact top is attached as a contact member to the tip of the contact arm in order to prevent the surface of the finish material from being scratched when nailing the finish material or the like to be driven. Since the contact top is a consumable item, it will sometimes need to be replaced with a new one. Therefore, the attachment / detachment must be easy, and at the same time, the attachment / detachment of the contact top involves an operation of directly pulling or pushing the contact top by hand, so it is important to ensure the safety of the operation during attachment / detachment. For this reason, various improvements have been proposed from the viewpoint of ensuring the ease of attaching and detaching the contact top and ensuring safety.

  For example, as an improvement from the viewpoint of easy attachment / detachment of the contact top, the contact top (nose adapter, nose cap) is projected into the recess (hole) of the contact arm by simply pulling or pushing into the tip of the contact arm. 2. Description of the Related Art A contact top made of an elastic member such as rubber (resin) that is easily detachable by engaging a portion (projection) is known (see, for example, Patent Documents 1 and 2).

In addition, as an improvement that focuses on the ease of attaching and detaching the contact top and the safety of work in attachment and detachment, the contact arm is pulled down to disable the trigger operation, and the contact arm and the contact top are disengaged. Has been proposed that is extracted from the guide of the nose portion, and the contact top is engaged with the contact arm and fitted to the guide of the nose portion (see, for example, Patent Document 3).
JP 2000-52274 A JP-A-2005-7544 Japanese Patent Application No. 2006-69679

  The contact tops of the inventions described in Patent Documents 1 and 2, which are improvement proposals that focus on the ease of attachment / detachment of the contact top described above, can be easily attached / detached by simply pulling or pushing into the contact arm tip. There is no problem because the contact arm is pulled when removing the contact top, but the contact arm is pushed in when wearing, so the air is connected and the hand touches the trigger when the nail is loaded. There is a risk of an unexpected situation where a nail is accidentally fired, leaving a safety issue.

  Further, in the contact member attaching / detaching structure of the invention described in Patent Document 3, which is an improvement proposal from the viewpoint of safety, the contact top can be attached / detached regardless of whether or not the nail is loaded. Since the contact arm is held in the pull-out direction when removing the handle, there is no problem even if the hand touches the trigger, but when the contact top is attached, the contact arm is held so that it is pushed in, so the hand still touches the trigger. However, it cannot be said that there is no unforeseen situation that the nail is accidentally fired.

  Under such circumstances, the present invention is a proposal of an improvement measure for a contact member attaching / detaching structure, which is made by paying attention to the solution of the above-described problem in mounting of a contact top of a conventional nailing machine, and includes a nail, a screw, and a screw. The nailing machine is provided with safety measures that prevent the above-mentioned unexpected occurrences in the attaching and detaching work of the contact top so that the attaching and detaching of the contact top itself cannot be performed in a state where a fastener such as is mounted. Is to provide.

  In order to solve the above-mentioned problem, the invention according to claim 1 of the present invention arranges the contact top so as to be slidable along the nail driving direction of the nose portion provided with the injection port provided below the nailing machine body. In addition, in the attachment / detachment structure of the contact member in the nailing machine in which a contact arm capable of reciprocating with a predetermined stroke amount is provided in the vicinity of the injection port in the vicinity of the injection port, and the contact top is attached to and detached from the tip of the contact arm The contact top can be attached to and detached from the tip of the contact arm when an additional stroke amount exceeding the stroke amount in the reciprocating operation of the contact arm is pulled out. It is possible only at the time of loading.

  The invention according to claim 2 is the invention according to claim 1, wherein the nailing machine body is provided with a stopper that prevents the contact arm from moving beyond a certain stroke, and the contact arm is attached to the fastener in the magazine. The contact arm is interlocked with the operation of a lever for detecting the presence or absence of loading, and when the fastener is not loaded, the contact arm is disengaged from the stopper to allow an additional stroke of the contact arm.

  According to a third aspect of the present invention, in the first or second aspect, a contact nose is used instead of the contact top.

  According to the first aspect of the present invention, in the contact member attaching / detaching structure of the nailing machine, the attachment / detachment of the contact top to the tip of the contact arm is an additional stroke exceeding the stroke amount in the reciprocating operation of the contact arm. It is possible to pull out the additional stroke amount of the contact arm, and only when the fastener is not loaded, the contact arm can be pulled out to a position where the contact top can be attached and detached. Can not. Accordingly, since the contact top cannot be attached / detached in a state where the nail is loaded, the occurrence of an unexpected situation due to the erroneous firing of the nail in the attachment / detachment of the contact top and the danger of the operation are surely eliminated.

  The invention according to claim 2 is the invention according to claim 1, wherein the nailing machine body is provided with a stopper that prevents the contact arm from moving beyond a certain stroke, and the contact arm is attached to the fastener in the magazine. In conjunction with the operation of the lever that detects the presence or absence of loading, when the fastener is not loaded, the contact arm is disengaged from the stopper to allow an additional stroke of the contact arm. Since the human operation is completely eliminated, there is no room for error in selection, and the safety of attaching / detaching the contact top based on this selection is sufficiently ensured.

  The invention according to claim 3 replaces the contact top with a contact nose. Since the contact nose operates in the same manner as the contact top, the same effect as the invention according to claim 1 or 2 is expected. be able to.

  In FIG. 1 thru | or FIG. 3 (a) (b) etc., the code | symbol A shows a nailing machine. The nailing machine A includes a main body 1 provided with a striking mechanism (not shown), a grip 2 disposed rearward from the main body 1, a nose portion 3 provided at a tip which is a lower portion of the main body 1, a nose portion And a rectangular straight magazine 4 connected to the nose portion 3 and connected to the nose portion 3, and the leading nail supplied to the nose portion 3 from the nail supply path 4a of the magazine 4 constitutes the hitting mechanism. The driver is driven by a driver integrally coupled with the striking piston.

-Nose part The nose part 3 is comprised by the driver guide 5 which comprises a front wall, and the wear plate 6 which comprises a rear wall, and the driver guide 5 is detachable with respect to the wear plate 6 with the volt | bolt 7, When integrally coupled, a nail injection path is formed between the two. A contact top 8 is disposed at the lower end of the wear plate 6.

-When the contact arm is driven out, the trigger 10 is pulled to operate a trigger valve for activation (not shown), so that compressed air supplied from the air compressor is sent to the striking mechanism, and the leading nail is driven out by the air pressure. However, the pulling operation of the trigger 10 is linked to the operation of the contact arm 11, and is configured so that the trigger valve can be effectively operated when actually pressed against the workpiece.

  That is, as shown in FIG. 2, the contact arm 11 includes an upper arm 12 (not shown clearly) that is a link with the trigger 10, an intermediate adjusting member 13, a lower rotating arm 16, and a further intermediate member. The nail sensing lever 17 between the adjusting member 13 and the rotating arm 16, the nail sensing lever 17, the contact top 8, and the like.

  The adjusting member 13 is formed by fitting a hollow portion 15 having a locking arm 15a in the middle of an adjusting bolt 14 having a screw portion at the lower end, and the hollow portion 15 is rotatable relative to the adjusting bolt 14. However, it is configured to move integrally in the vertical direction.

  The locking arm 15a includes an upper surface that can be engaged with the lower end 12a of the upper arm 12 and a tip having a lower surface that can abut against a protruding portion 41 protruding from a side wall of the magazine 4 described later. It rotates by interlocking with rotation of the nail detection lever 17 via 18 (it is formed integrally with the hollow part 15).

  The nail detection lever 17 is provided with a nail detection portion 17a at the tip thereof. The nail detection portion 17a can be projected and retracted in a nail supply path 4a inside the magazine 4, and the nail detection lever 17 is loaded with a nail in the supply path 4a. In this state, the nail sensing portion 17a at the front end is pushed out so as to retract from the supply path 4a against the spring S at the rear end 17b, and the nail is not filled in the supply path 4a by the spring S. It rotates so as to enter the supply path 4a (see FIG. 5). Therefore, when the nail is filled in the supply path 4a of the magazine 4, the front end of the locking arm 15a rotates so as to approach the side wall of the magazine 4, and the upper engaging portion 41a of the protruding portion 41 of the side wall is rotated. The lower surface of the front end is opposed so as to be engageable (see FIG. 3A), and when the nail is not filled in the supply path 4a, the front end of the locking arm is rotated away from the side wall of the magazine 4. It moves to a position where it cannot engage with the engaging portion 41a.

  A screw portion is formed at the lower end of the adjusting bolt 14, and this screw portion is screwed into a female screw portion formed in the cylindrical portion 16 a at one end of the rotating arm 16. An adjustment dial D is provided on the top of the adjustment bolt 14. The adjustment dial D is held at a fixed position of the nailing machine body 1, and a non-circular bearing hole having a D-shaped cross section is formed through the center thereof, and the upper part of the adjusting bolt 14 is fitted into the bearing hole. Yes. For this reason, when the adjustment dial D is turned, the adjustment bolt 14 is also rotated integrally, but both are configured to be relatively movable in the vertical direction. Accordingly, since the adjustment bolt 14 is also rotated by turning the adjustment dial D, the rotation arm 16 is screwed according to the rotation direction and the rotation amount thereof, so that the position can be adjusted in the vertical direction.

The amount of movement of the contact arm The amount of downward movement of the rotating arm 16 of the contact arm 11 is the amount of movement that moves as the upper arm 12 moves to the lowermost end, and the amount of movement that moves further downward by the adjustment dial D. Although the amount is the amount of movement in normal use, the nail that the nail is not loaded in the supply path 4a of the magazine 4 by further pulling the rotating arm 16 downward. It can be additionally moved only when it is detected by the sensing lever 17 and the tip of the locking arm 15a is separated from the upper engaging portion 41a of the protruding portion 41 of the magazine 4.

  The additional movement only when the nail is not loaded in the supply path 4a of the magazine 4 with respect to the normal use area is such that the tip 16b of the rotating arm of the contact arm 11 is completely exposed from the driver guide 5. The amount of movement is set to the amount of drawer movement until the tip of the locking arm 15a engages with the lower engaging portion 41b of the protruding portion 41 of the magazine 4 (FIGS. 4 to 4). (See FIG. 6).

  On the other hand, when the nail is filled in the supply path 4a of the magazine 4 is detected by the nail detection lever 17, the tip of the locking arm 15a can be engaged with the upper engaging portion 41a of the protruding portion 41 of the magazine 4. When the contact arm 11 is positioned at a position where the contact arm 11 is moved downward in the normal use range, the tip of the locking arm 15 a can be engaged with the upper engagement portion 41 a of the protrusion 41. Therefore, when the rotating arm 16 is pulled downward, the tip of the locking arm 15 immediately comes into contact with the upper engaging portion 41a, so that the movement of the contact arm 11 through the hollow portion 13 is prevented, and the contact arm 11 beyond this is stopped. Cannot be pulled out downward (see FIG. 3A).

Contact top The contact top 8, as shown in detail in FIG. 7 and FIG. 8, is a member that has almost the same outer shape corresponding to the shape of the lower part of the wear plate 6 and is slightly larger than a metal such as iron or stainless steel. It is formed thin and has an elastic body such as rubber or synthetic resin fixed to the outer surface of the tip. U-shaped guide grooves 8a that engage with both side edges of the wear plate 6 are formed on both side faces of the contact top 8, and the lower side edges of the wear plate 6 engage with the inside of the guide grooves 8a. The contact top 8 can slide along the wear plate 6 while maintaining this engaged state.

  Further, an engagement groove 8b is formed on the side of the upper side of the guide groove 8a. As shown in FIGS. 2, 3 (b), 6 and the like, the front end of the contact arm 11 is formed. The tip 16b of the rotating arm 16 is engaged from the side with the engaging groove 8b of the contact top 8, and the contact top 8 is attached to the tip 16b of the rotating arm 16.

  A part of the contact top 8 above the engaging groove 8 b and a part of the contact arm 11 above the tip 16 b of the rotating arm 16 are covered with a cover 51 provided on the side of the driver guide 5. However, in the additional movement of the contact arm described above, the contact top 8 has an engagement groove 8b between the wear plate 6 and the driver guide 5, that is, from the lower end 51a of the cover 51. It can be moved to a fully exposed position.

Attachment / detachment of contact top As described above, attachment / detachment of the contact top 8 is possible in a state where the nail is not loaded in the supply path 4 a of the magazine 4. That is, when the nail is not loaded in the supply path 4a of the magazine 4, the tip of the locking arm 15a of the hollow portion 15 is separated from the side wall of the magazine 4 and separated from the upper engaging portion 41a of the protruding portion 41 of the side wall. The contact top 8 can be attached and detached only when it is positioned at the position where it cannot be engaged.

  That is, when attaching or detaching the contact top 8, first, the adjustment dial D is rotated to lower the adjustment bolt 14 by the maximum adjustment amount. As a result, the pivot arm 16 and the contact top 8 are also moved downward by the same amount.

  Next, the adjustment bolt 14 is pulled further downward as shown in FIG. At this time, the distal end of the locking arm of the hollow portion 15 of the contact arm 11 is separated from the position facing the upper engaging portion 41a of the protrusion 41 on the side wall of the magazine 4, and can be pulled downward as it is. The bolt 14 moves to a position where the lower portion of the locking arm 15 a engages with the lower engaging portion 41 b on the side wall of the magazine 4.

  When the contact arm 11 is moved downward as much as possible by manually pulling the adjustment bolt 14 in this manner, the engagement groove 8b of the contact top 8 and the tip 16b of the rotating arm 16 are moved as shown in FIG. The driver guide 5 is completely exposed from the lower end 51 a of the cover 51 on the side of the driver guide 5. Therefore, when the pivot arm 16 is pivoted to remove the arm tip 16b from the engagement groove 8b, the contact top 8 becomes free, so that it can be pulled down and removed from the wear plate 6.

  On the other hand, when the contact top 8 is attached to the contact arm 11, both sides of the wear plate 6 are engaged inside the guide groove 8 a of the contact top 8 with the contact arm 11 pulled down to the maximum as described above. The contact arm 11 is slid upward to be lifted, and the pivot arm 16 of the contact arm 11 is pivoted to engage the tip 16b of the contact arm 8 with the engagement groove 8b. Then, the contact arm 11 and the contact top 8 are supported by the hand and moved upward by an amount corresponding to the amount by which the adjustment bolt 14 is pulled, and the adjustment bolt 14 is returned to the position before the pull-down.

  By this upward movement, the tip end 16 b of the rotating arm 16 and a part of the engagement groove 8 b of the contact top 8 are covered and held inside the cover portion 51 of the driver guide 5. For this reason, since the rotation arm 16 cannot be rotated, the contact top 8 moves integrally in a state where it is attached to the rotation arm 16.

  Further, the dial D of the adjusting bolt 14 is rotated in the reverse direction, and the contact arm 11 and the contact top 8 are moved upward by the amount of the adjustment described above, and the adjustment adjustment amount of the contact arm 11 with respect to the adjusting bolt 14 is set to the initial position. return. This completes the work of attaching the contact top 8.

  As another embodiment of the present invention, as shown in FIG. 9 and FIG. 10, it is possible to perform locking to prevent the contact arm 11 from being pulled downward by a manually operated locking lever 20. The locking lever 20 includes an operation portion 21 and a hook-shaped locking portion 22 formed of an arm portion bent at a substantially right angle, and a pivot 23 is attached to a cover portion 42 that covers the contact arm 11 on the front side portion of the magazine 4. When the nail is loaded, the hook-shaped locking portion 22 is immersed in the lower space of the locking arm 15a of the contact arm 11, and the lower portion of the locking arm 15a is lowered when the contact arm 11 is pulled out downward. By engaging with the locking portion 22 and the downward movement of the arm portion 15a is blocked, the downward movement of the contact arm 11 is blocked.

  Further, when the contact arm 11 for pulling out the contact top 8 when the nail is not loaded is pulled out downward, the operation portion 21 is manually pressed to release the engagement of the locking portion 22 in the space. By holding the locking portion 22 at a position away from the space, the contact arm 11 can be pulled out to a position where the contact arm 11 can be pulled out downward, that is, the contact top 8 can be attached and detached.

  Furthermore, as another embodiment, as shown in FIG. 11, instead of the contact top described above, the contact member is replaced with a contact nose 80 provided with an injection port (not shown) following the injection port of the nose portion 3, Application to a contact nose system in which this is attached and detached is also possible.

  Since the above-described attachment / detachment structure of the contact top 8 has the above-described configuration, the following effects can be obtained.

  When the nail is loaded, the contact arm 11 is completely prevented from being pulled out beyond the range of movement in the normal use range. Therefore, the contact top 8 cannot be attached and detached, and only when the nail is not loaded. Thus, the contact arm 11 can be pulled out downward to obtain an additional stroke amount exceeding the moving range in the use range, and the contact top 8 can be attached and detached. Therefore, the work for attaching and detaching the contact top 8 can be performed with peace of mind while ensuring the safety, and the work is easy to perform and the workability is improved.

  The prevention of the downward movement of the contact arm 11 when the nail is loaded and the permissibility of the downward movement of the contact arm 11 when the nail is not loaded are the loading state of the nail in the nail supply path 4a of the magazine 4. Since the engagement of the locking arm 15a in conjunction with the rotation of the nail detection lever 17 that detects the movement of the nail is engaged and disengaged from the protruding portion 41 of the front side wall of the magazine 4, the selection is accurate and automatically. Since the human operation is completely eliminated, there is no room for error in selection, and the safety of the attaching / detaching operation of the contact top 8 based on this selection is sufficiently ensured.

  The contact top 8 is attached / detached by removing or attaching the contact top 8 from the pivot arm 16 of the contact arm 11 which is pushed out and pulled out of the nailing machine body 1 and removed from the driver guide 5. In this manner, the contact top 8 can be attached / detached without removing the driver guide 5, and the need for a tool such as a spanner in the attachment / detachment work of the contact top 8 is eliminated, thus greatly improving the workability. Can be made.

  The movement amount of the contact arm 11 is obtained by adding a movement amount until the engagement groove 8b of the contact top 8 is completely exposed from the driver guide 5 to the movement amount in normal use. Since the engaging groove 8b of the contact top 8 is not completely exposed at the time of the work, and the upper part of the contact groove 8 is covered or entirely covered. It does not come off the pivot arm 16 at the tip.

  The contact member attaching / detaching structure can be applied not only to a nailing machine but also to a driving tool for driving screws.

It is a side view which shows the one aspect | mode of the nail driver of this invention, and is a figure which shows the largest drawer | drawing-out position of the contact top at the time of the latching | locking part effect | action at the time of nail loading. It is an enlarged view of the principal part in FIG. (A) is the aa cross-sectional enlarged view in FIG. 2, (b) is the enlarged view of the principal part shown in the state which cut | disconnected the front-end | tip part of the rotation arm. It is a side view which shows the one aspect | mode of the nail driver of this invention, and is a figure which shows the largest drawer | drawing-out position of the contact top at the time of the latching | locking part non-operation at the time of the nail non-loading. It is bb sectional drawing in FIG. It is an enlarged view of the principal part in FIG. FIG. 5 is a diagram showing a state in which the top is pulled out and removed at the maximum pull-out position of the contact top in FIG. 4. It is cc sectional drawing in FIG. FIG. 2 is a diagram in which the locking portion action in FIG. 1 is caused by a locking portion of another structure. FIG. 10 is a sectional view taken along line dd in FIG. 9. It is the figure where the application to attachment / detachment of a contact nose was made.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Nailer body 2 Grip 3 Nose part 4 Magazine 5 Driver guide 6 Wear plate 8 Contact top 10 Trigger 11 Contact arm 15a Locking arm 17 Nail detection lever

Claims (3)

A contact arm capable of reciprocating with a predetermined stroke amount in parallel with the nail driving direction is provided along a nose portion provided with an injection port provided below the nailing machine body, and the tip of the injection port is provided at the tip of the contact arm. In the attaching / detaching structure of the contact member in the nailing machine for attaching / detaching the contact top arranged at the tip,
The contact top can be attached to and detached from the tip of the contact arm when the additional stroke amount exceeding the stroke amount in the reciprocating operation of the contact arm is pulled out. A structure for attaching and detaching a contact member in a nailing machine, which is only possible at times.   The nailer body is provided with a stopper that prevents the contact arm from moving beyond a certain stroke, and the contact arm is interlocked with the operation of a lever that senses whether or not the fastener in the magazine is loaded, so 2. The contact member attaching / detaching structure according to claim 1, wherein the contact arm is disengaged from the stopper to allow an additional stroke of the contact arm during loading.   The contact member attaching / detaching structure in the nailing machine according to claim 1, wherein a contact nose is used instead of the contact top.

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