JPH0872013A - Detecting device for nail jam of nailing machine - Google Patents

Abstract

PURPOSE: To make swift correspondence by detecting nail jam in a nose part of a nailing machine. CONSTITUTION: A slide shutter 15 frequenting nailing guiding hole 7 is provided in a nose part 6 of a nailing machine. The slide shutter 15 is driven by an air cylinder 16 provided with a positional sensor. A nail(N) is charged automatically into a nailing guide hole 7 by advancing and driving the slide shutter 15 to a set position P1 and the nail(N) is held by the slide shutter 15. At the time of nailing, the slide shutter 15 is shunted from the nailing guide hole 7. At the time of generation of nail jam, the slide shutter 15 can't be attained to the set position P1 by a bent nail and the nail jam is detected by a positional sensor built in the air cylinder 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nailing machine that uses air pressure, electricity or the like as a power source, and more particularly to a nail jamming detecting device for detecting clogging of a nose portion of the nailing machine. .

[0002]

2. Description of the Related Art In a nail driving machine, a nail supplied to a driving guide hole in a nose portion of the nail driving machine is driven to a desired place by a driver driven by compressed air or the like. The nose portion is provided with a slide shutter protruding into the driving guide hole, and the head of the nail supplied from a nail feeder or the like is held by the slide shutter so that the nail does not drop from the nose portion. The slide shutter is connected to a contact arm, etc. attached to the tip of the nose part, and when driving, it retracts from the driving guide hole to release the holding of the nail, and the driver hits the nail head and drives the nail into the target object. . Then, when the driver moves up to the standby position, the slide shutter again projects into the driving guide hole and stands by for the next supply of nails.

[0003]

During a nailing operation by a nailing machine, for example, a nail is struck in a knot or the like of a wood at a driving position, and the nail bends in the nose portion of the nailing machine, resulting in nail clogging. Sometimes. When the nailer is hand-held, it is possible to detect clogging of nails, but when performing automatic nailing work, when clogging of nails occurs, blanking will be continuously interrupted while the nails are clogged in the subsequent steps. It will come.

Therefore, there arises a technical problem to be solved in order to prevent the occurrence of defective products and the reduction of work efficiency by making it possible to detect the occurrence of nail clogging in the automatic nailing work. The object is to solve the above problems.

[0005]

DISCLOSURE OF THE INVENTION The present invention is proposed in order to achieve the above-mentioned object, and is provided with a slide shutter which moves into and out of a driving guide hole in a nose portion of a nail driving machine,
A nail driving machine in which a head of a nail introduced into a driving guide hole is supported by the slide shutter, the slide shutter is retracted to open the driving guide hole, and then a driver is driven to drive the nail. And a sensor for detecting the position of the slide shutter is provided, and nail clogging of a nailing machine configured to detect clogging of the nail in the driving guide hole based on an output state of the sensor at a forward stop position of the slide shutter. A device is provided.

[0006]

The slide shutter provided in the nose portion of the nail driving machine is driven by an actuator such as an air cylinder or a mechanical cam mechanism so that it can be freely moved in and out of the driving guide hole of the nose portion. When the slide shutter projects into the driving guide hole, the head of the nail supplied to the nose portion is prevented from passing by the slide shutter, and the nail is supported in the driving guide hole.

When the nail driver is pressed against the driving target, the slide shutter retracts from the driving guide hole, and the nail is driven by the driver. After driving, the slide shutter protrudes again into the driving guide hole and waits for the next nail to be introduced.However, if the nail bends and is jammed in the driving guide hole for some reason, the slide shutter comes into contact with the nail and the predetermined Stop before the position. At this time, the sensor that detects the position of the slide shutter detects that the slide shutter does not reach the target position, and the occurrence of nail clogging is detected.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. 1 and 2 show an air-driven nailing machine 1, which is attached to an automatic nailing device via a bracket (not shown). As shown in FIG. 2, a cylinder portion 3 is formed in the casing 2 of the nail driving machine 1, and a plunger 4 is loosely inserted in the cylinder portion 3. Driver 5 for plunger 4
Are coupled, and the driver 5 moves up and down along the driving guide hole 7 formed in the nose portion 6.

High pressure air as a driving source is supplied by connecting a socket 9 provided at an end of the grip portion 8 of the nailing machine 1 to a compressor 10 by connecting a hose 11 to the trigger valve socket. 12 is connected to the compressor 10 via an electromagnetic switching valve 13. Also, as shown in FIG.
Nail chutes 14 are attached to the upper and lower intermediate portions of the front surface of the nose portion 6, and the nails dropped from the nail feeder device (not shown) that supplies the nails one by one to the nail chute 14 through a hose are not attached to the nose portion 6 by a hose. Is injected into the driving guide hole 7. The driving guide hole 7 has an inner size through which a nail can pass, and a slide shutter 15 is provided below the connecting portion of the nose portion 6 with the nail chute 14.

The slide shutter 15 is connected to a piston rod of an air cylinder 16 with a position sensor fixed to the side surface of the nose portion 6 and is driven orthogonally to the axis of the driving guide hole 7. As shown in FIG. 2, when the nail is thrown in from the nail chute 14 at the position retracted from the driving guide hole 7, when the nail is thrown in from the nail chute 14, as shown in FIG. The gap between the hole wall of the driving guide hole 7 and the slide shutter 15 is driven forward to a position P ₁ where the axial diameter of the nail N is approximately equal to prevent the head H of the nail N from passing,
Are held in the nose portion 6.

As shown in FIG. 3, the control device 18 drives the electromagnetic switching valve 19 to control the air cylinder 16, and the position sensor 17 built in the air cylinder 16 controls the forward / backward stop position. Piston rod 16a
Is detected, and the clogging of the nose portion 6 is detected based on the detected value.

Next, the operation of the nailing machine 1 will be described with reference to FIGS. First, when the control device 18 is activated (step 101), the electromagnetic switching valve 19 that controls the air cylinder 16 with the position sensor is switched (step 10).
2) The slide shutter 15 is driven in the forward direction, and the time set according to the moving time of the piston 16a of the air cylinder 16 with the position sensor is counted (step 10).
After 3), the state of the position sensor 17 of the air cylinder 16 with position sensor is read (step 104).

Then, after detecting that the slide shutter 15 has reached a predetermined position, a signal is output to the nail feeder device 20 to insert the nail N into the driving guide hole 7 (step 105). When the loading of the nail N is detected by the proximity sensor 21 provided in the nose portion 6 (step 106), the nose portion 6 of the nail driving machine 1 is subsequently pressed against the driving target. When the contact arm 22 is driven and the contact switch 23 is turned on (step 107), the electromagnetic switching valve 19 is switched, the slide shutter 15 is retracted (step 108), and the driving guide hole 7 is opened.

Then, the electromagnetic switching valve 13 for controlling the trigger valve is switched (step 109), the driver 5 of the nail driver 1 is driven to drive the nail N into the driving target, and the driver 5 descends and then moves upward. After counting the time required for one cycle to return to the standby position (step 110), the process returns to step 102 and the above process is repeated.

Here, as shown in FIG. 6, when the nail N to be driven is not driven into the object for some reason, but is bent and jammed in the driving guide hole 7 by the impact of the driver 5, When the slide shutter 15 is driven forward (step 102), the slide shutter 15 comes into contact with the deformed nail N in the driving guide hole 7 and cannot reach the set position P ₁ . Therefore, after the elapse of the set time (step 103), since the output of the position sensor 17 is off (step 104), all the operations are stopped (step 111) and processing such as warning display is performed.

As a result, the worker who recognizes the occurrence of the clogging of the nail performs the nail removing work and restarts the automatic nailing device, whereby the nailing work is restarted from the point where the process is interrupted. The present invention should not be limited to the above-described embodiment, and for example, the drive mechanism of the slide shutter 15 and the like can be modified in various ways, and the present invention does not extend to those modifications. Of course.

[0017]

As described in detail in the above-mentioned embodiment, the present invention detects the clogging of the nose portion of the nailing machine immediately after the clogging of the nailing machine. It is possible to eliminate the risk of defective products and process delays due to the above, and it is effective in preventing a decrease in work efficiency.

[Brief description of drawings]

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

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

FIG. 3 is a block diagram of an automatic nailing device.

FIG. 4 is an explanatory diagram showing a forward movement position of a slide shutter.

FIG. 5 is a flowchart of the operation of the nail driver.

FIG. 6 is an explanatory view showing nail clogging at the nose portion.

[Explanation of symbols]

 1 nail driver 5 driver 6 nose part 7 guide hole 15 slide shutter 16 air cylinder with position sensor 17 position sensor 18 controller 19 solenoid switching valve

Claims (1)

[Claims] 1. A nose portion (6) of a nailing machine is provided with a slide shutter (15) which goes in and out of a driving guide hole (7),
The head of the nail introduced into the driving guide hole (7) is supported by the slide shutter (15), the slide shutter (15) is retracted to open the driving guide hole (7), and then the driver (5). ) Is driven to drive the nail, the sensor (17) for detecting the position of the slide shutter (15) is provided, and the slide shutter (15) is provided.
A nail jam detecting device for a nail driving machine configured to detect a nail jam in the driving guide hole (7) based on the output state of the sensor (17) at the forward stop position.