JPH08243950A - Trigger device for automatic nailing machine - Google Patents

Abstract

PURPOSE: To facilitate nailing pitch changing work of a trigger device by cams installed in an automatic nailing machine. CONSTITUTION: Plural cams 22,... are installed on a hexagonal cross-sectional camshaft 14 installed just under a trigger lever 15 of a nailing machine 1 so as be freely movable in the shaft direction. A fork lever 25 arranged in the rear of the camshaft 14 sandwiches a selected single cam, and positions it just under the trigger lever 15. The fork lever 25 is energized to a position to engage with the cam by a spring 27. A front roller 11 and the camshaft 14 are connected to each other through a belt 20, and the roller 11 is grounded, and when the nailing machine 1 is made to travel, the cam rotates in synchronism with the roller 11, and the cam positioned just under the trigger lever 15 reciprocates on the trigger lever 15, and nails are driven at constant intervals into a plate material 2. When a driving pitch is changed, the fork lever 25 is rotated, and engagement with the cam is released, and an optional cam is moved to a fixing position on the camshaft 14, and the fork lever 25 is engaged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trigger device for an automatic nailing machine, and more particularly to a trigger device for an automatic nailing machine which mechanically nails at a constant pitch by a cam.

[0002]

2. Description of the Related Art There is known an automatic nailing machine having a mechanical structure in which nails are nailed to a nailing object at a constant pitch while relatively moving the nailing object and a nailing machine on a work table. . In this type of automatic nailing machine, the nailing machine is provided with a cam facing the trigger lever or the valve stem of the starting operation valve, and the nose portion is provided with a rolling roller.
The rolling roller projects slightly from the nose part in the nail ejection direction.When the rolling roller is grounded to the nailing target on the work table and the automatic nailing machine is run, the nose part of the automatic nailing machine runs. Moves on the nailing target while maintaining a constant distance from the nailing target.

The rolling roller and the cam shaft are connected by a timing belt or the like, and the cam rotates in conjunction with the traveling of the automatic nailing machine, and the cam reciprocates the trigger lever or the valve stem of the starting operation valve. As a result, the nail is driven into the nailing target every constant traveling distance.

Also, in order to cope with various nail driving pitches, there is known a trigger device in which a plurality of types of cams are fitted on a cam shaft so as to be slidable in the axial direction. In this trigger device, a desired driving pitch can be set by selecting a cam according to the purpose, moving it to a position directly below the valve stem of the trigger lever or the starting operation valve, and fixing it by a fixing means such as a screw. it can.

[0005]

The conventional trigger device having a mechanical structure using a cam has a problem in workability because it takes time and labor to change the nail driving pitch.

Therefore, there is a technical problem to be solved in order to facilitate the work of changing the nail driving pitch and improve the workability, and an object of the present invention is to solve the problem.

[0007]

DISCLOSURE OF THE INVENTION The present invention is proposed to achieve the above object, and allows a plurality of cams to be axially movable to a cam shaft having a non-circular cross section such as a square cross section shaft or a feather key shaft. The cam shaft is fitted and installed directly below the starting operation member such as the valve stem or trigger lever of the starting operation valve of the nail driving machine, and any cam on the cam shaft is fixed facing the starting operation member. And a roller for supporting the nailing machine and grounding on the nailing target surface, and connecting the cam shaft and the roller via a timing belt or the like to form a synchronous rotation mechanism. In a trigger device of an automatic nailing machine configured such that the selected cam switches and operates the starting operation member in conjunction with a roller that rolls on a surface to be nailed, a fore means is provided as a positioning means for the cam. A lever is pivotally mounted in the vicinity of the cam shaft, and the fork lever is rotatable between an engaging position where the fork portion at the tip is sandwiched by the selected cam and a position retracted from the cam, and a spring. The trigger device for an automatic nailing machine is characterized in that the trigger device is biased to the engagement position by the above.

[0008]

The trigger device of the automatic nailing machine of the present invention is a fork lever as a means for fixing the cam slidably fitted on the cam shaft to the actuation operation member such as the trigger lever or the valve stem of the actuation operation valve. Is used. The fork lever is urged by a spring urging to a rotational position where it engages with the cam on the cam shaft, and the fork portion at the tip clamps both side surfaces of one cam to start the cam. Position directly under.

When the automatic nail driving machine travels on the surface of the nail driving object, the cam rotates in synchronization with the rotation of the roller grounded on the nail driving object, and the cam is positioned directly below the starting operation member by the fork lever. By moving the trigger lever or the like back and forth by the cam, the nails are driven into the nailing target at regular intervals.

When changing the nail driving pitch, the fork lever is rotated to disengage the fork from the cam,
If you move any cam to a fixed position on the cam shaft and release your hand from the fork lever, the fork lever will rotate due to the bias of the spring, and the fork part will engage the selected cam and move in the axial direction of the cam. The movement of the cam is regulated, and the cam is positioned immediately below the starting operation member.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. In FIG. 1, reference numeral 1 is an automatic nailing machine, and 2 is a plate material to be nailed in on a work table. The automatic nailer 1 is mounted on a carriage or a bracket (not shown) of the automatic nailer, and high-pressure air is supplied from an air compressor through an air hose connector plug 3. One or both of the automatic nailing machine 1 and the plate material 2 are moved by the feed mechanism, and the automatic nailing machine 1 travels in one direction in front of or behind the plate material 2.

A trigger device 5 is fixed by bolts 6 to the front surface of the nose block 4 of the automatic nailing machine 1. In the frame 7 of the trigger device 5, the side plates 7b are bent rearward from the left and right ends of the front plate 7a, and as shown in FIG. 2, the rollers 10, 11 are attached to the shafts 8, 9 at the front lower end portions of the left and right side plates 7b. Is attached. In the figure, a gear pulley 12 is attached to the right shaft 9, and a roller 11 is attached to the gear pulley 12 so that the roller 11 and the gear pulley 12 rotate integrally. Also, this roller 1
Two O-rings 13 are wound around the outer peripheral surface of 1 to prevent the roller 11 from slipping.

As shown in FIG. 1, the cam shaft 14 installed between the left and right side plates 7b is located immediately below the trigger lever 15 of the automatic nailing machine 1, and the cam shaft 14 is located behind the cam shaft 14. A fork support shaft 16 is installed in parallel with the shaft 14.
The cam shaft 14 is a hexagonal cross-section shaft, and as shown in FIG. 3, a screw 18 inserted into a bearing hole 17 opened in the left and right side plates 7b.
Are fastened to both ends of the cam shaft 14 to rotatably support the cam shaft 14. A gear pulley 19 is fixed to the left end portion (lower side in FIG. 3) of the cam shaft 14, and the gear pulley 1
The timing belt 20 is mounted on the gear 9 and the gear pulley 12 of the roller 11 described above. Further, three cams 21, 22, 23 are mounted on the cam shaft 14.

As shown in FIG. 4, the three kinds of cams 21, 22 and 23 each having one to three cam ridges each have a hexagonal hole 24 having the same sectional shape as that of the cam shaft 14, and rotate together with the cam shaft 14. Further, it is formed so as to be slidable on the cam shaft 14.

As shown in FIGS. 1 and 3, a fork lever 25 is fitted in the center of the fork support shaft 16 which is rotatably supported. The fork portion 25a at the front part of the fork lever 25 is spaced from each other by three types of cams 21, 22, 2
It is formed to be slightly wider than the thickness of 3, and the fork portion 25a
The arbitrary cams 21, 22, and 23 can be clamped by. Further, a torsion coil spring 27 is interposed between the fork lever 25 and the nail magazine 26 located below the fork lever 25, and the fork lever 25 is biased clockwise in FIG. A stopper portion 25b extending toward the top is provided, and as shown in the figure, at the rotational position where the fork portion 25a engages with the cam, the stopper portion 25b abuts the upper surface of the nail magazine 26 and the rotation is stopped. There is.

As shown in FIG. 1, at the rotational position where the fork portion 25a engages with the cam, the tip of the fork portion 25a reaches the vicinity of the cam shaft 14, and the tip of the fork portion 25a and the shaft center of the cam shaft 14 are formed. The intervals of cams 21, 22, 23
Is smaller than the minimum radius of the cam 21, the cams 21, 22 and 23 are always clamped on both side surfaces by the fork portion 25a during rotation, so that the cam shaft 1 is separated from the fork portion 25a at the time of rotation.
It does not move up 4.

When the automatic nailing device is activated, the automatic nailing machine 1 travels on the surface of the plate material 2, and the cams 21, 22, 2 are synchronized with the rotation of the rollers 10, 11 which are in contact with the plate material 2.
3 rotates, and the cam positioned immediately below the trigger lever 15 by the fork lever 25 is the trigger lever 1
By turning the trigger lever 15 in contact with 5,
Nails are driven into the plate material 2 at regular intervals.

When changing the nailing pitch, first, the fork lever 25 is manually rotated counterclockwise in FIG. 1 to release the engagement between the fork portion 25a and the cam. Then, the cams 21, 22, and 23 are slid along the cam shaft 14, and any cam is moved to the central fixed position of the cam shaft 14 and the fork lever 25 is released. The urging force causes the cam to rotate to the engagement position, and the selected cam is clamped by the fork portion 25a and positioned immediately below the trigger lever 15.

The shape of the fork lever 25, the number of cams, etc. should not be limited to the above-mentioned embodiment, but various modifications can be made within the technical scope of the present invention.
It goes without saying that the invention extends to these modifications.

[0020]

As described in detail in the above-described embodiment, the present invention fixes a cam slidably fitted on a cam shaft so as to face a starting operation member such as a trigger lever or a valve stem of a starting operation valve. A fork lever is used as a means for doing this. When changing the nail driving pitch, rotate the fork lever to the retracted position, move any cam to the fixed position on the cam shaft, and engage the fork lever to move the selected cam to the specified position. This is an invention in which the work of being fixed and changing the nail driving pitch is extremely quick and easy and contributes to the improvement of workability.

[Brief description of drawings]

FIG. 1 is a side view of an automatic nailing machine showing an embodiment of the present invention.

FIG. 2 is a front view of the automatic nailing machine shown in FIG.

FIG. 3 is a plan view of a trigger device.

4A, 4B, and 4C are side views of three types of cams, respectively.

[Explanation of symbols]

 1 Automatic Nailing Machine 2 Plate Material 5 Trigger Device 7 Frame 8, 9 Shaft 10, 11 Roller 12, 19 Gear Pulley 13 O Ring 14 Cam Shaft 15 Trigger Lever 16 Fork Support Shaft 20 Timing Belt 21, 22, 23 Cam 25 Fork Lever 27 Torsion coil spring

Claims (1)

[Claims] 1. A plurality of cams (21, 22, 22) attached to a cam shaft (14) having a non-circular cross section such as a square cross section shaft or a feather key shaft.
23) is fitted so as to be movable in the axial direction, and the cam shaft (14)
Is installed directly below a starting operation member such as a valve stem of a starting operation valve or a trigger lever (15) of a nailing machine, and an arbitrary cam on the cam shaft (14) is fixed to face the starting operation member. A roller (10, 10) is provided which is provided with a positioning means and which supports the nailing machine and grounds on the surface to be nailed.
11) is provided, the cam shaft (14) and the roller (11) are connected via a timing belt (20) or the like to form a synchronous rotation mechanism, and the roller (10) rolls on the nailing target surface. , 11), the trigger device of the automatic nailing machine is configured such that the selected cam switches and operates the activation operation member, and a fork lever is used as a positioning means for the cam (21, 22, 23). (25) is pivotally attached in the vicinity of the cam shaft (14), and the fork lever (25) is attached.
Is rotatable between an engaging position where the fork portion (25a) at the tip is clamped by the selected cam and a position retracting from the cam, and is biased to the engaging position by a spring (27). A trigger device for an automatic nailing machine characterized by being provided.