JP5443933B2 - Nailing machine - Google Patents

Description

  The present invention relates to a nailing machine for gold nails, staples and the like.

  Conventionally, as a nailing machine, as disclosed in Patent Document 1, a nail holding device that holds a nail, a hammer that drives a nail held by the nail holding device into a work, and a hammer driving device are provided. There is something to become. In this nailing machine, in order to make it possible to detect nailing defects, a metal sensor is attached, and a stroke sensor is provided in a moving mechanism of the metal sensor. After the nailing by the nailing machine is completed, the metal sensor is moved to the nailing position on the workpiece. If the nail is not driven and the nail driving machine is idle, the metal sensor does not respond and it is detected that there is no nail. When the nail floats without being driven to the end, the metal sensor cannot collide with the nail and move, and the stroke sensor detects the driving failure.

Japanese Patent Laid-Open No. 8-174381

  However, in the nailing machine described in Patent Document 1, even if the nail 1 is driven to the end of the workpieces 2A and 2B, the nail is detached as shown in FIG. 2B, or shown in FIG. It is not possible to detect nailing defects that cause cracks in wood.

  An object of the present invention is to inspect a nail quality with high accuracy in a nailing machine.

The invention of claim 1 is a nailing machine comprising a nail holding device for holding a nail, a hammer for driving a nail held by the nail holding device into a workpiece, and a hammer driving device. The load detection sensor for detecting the nail driving load, the hammer position detection sensor for detecting the position of the hammer, the detection data of the load detection sensor and the hammer position detection sensor are acquired, and the transition of the nail driving load and the hammer position is obtained. Ri Na and a discriminating means for discriminating the nailing quality Te, said determining means, when the nail is set nailing completion load Pe when completed implantation into the workpiece, reaches this nailing complete load Pe The hammer position Le is sampled, and the hammer position L for checking the nail driving load in the intermediate stage of driving the nail into the workpiece is set, and the hammer is driven at the position L. Heavy P is sampled, and the hammer position Le and driving load P are compared to those Le and P passing data Lea and Pa when the nail is driven into the work well. It is to be discriminated .

According to a second aspect of the present invention, in the first aspect of the invention, the discrimination means sets two points of hammer positions L1 and L2 for checking a nail driving load in an intermediate stage in which the nail is driven into a workpiece. The hammer loads P1, P2 at the hammer positions L1, L2 are sampled, and the hammer positions Le, P2, P2 are used as the Le, P1, P2 at normal times when the nail is successfully driven into the workpiece. Compared with the pass data Lea, P1a, P2a, the nail driving quality is discriminated .

According to a third aspect of the present invention, in the second aspect of the present invention, the determination means is configured such that Le is Le or higher, P1 is P1a or higher, P2 is P2a or higher, and P2−P1 is a constant value. This is what is described above.

(Claim 1)
(a) In the nailing machine, having the load detection sensor, the hammer position detection sensor, and the discrimination means, the discrimination means acquires the detection data of the load detection sensor and the hammer position detection sensor, and the nail driving load and the position of the hammer are detected. The nailing quality is determined based on the transition. Thereby, it is possible to detect nailing defects such as detachment of nails and cracking of wood.

(b) The discriminating means sets a nail driving completion load Pe when the nail has been driven into the work, collects the hammer position Le when the nail driving completion Pe is reached, and hits the nail into the work. The hammer position L for checking the nail driving load at the intermediate stage is set, the driving load P at the hammer position L is sampled, and the nail strikes the workpiece at the position Le and driving load P well. The nail quality can be inspected with high accuracy by discriminating the nail quality in comparison with the Le and P pass data Lea and Pa in the normal state.

(Claim 2 )
(c) The determination means sets two points, hammer positions L1 and L2, for checking the nail driving load in the intermediate stage in which the nail is driven into the workpiece in the above (b), and the hammers are driven at the positions L1 and L2. The loads P1 and P2 are sampled, and the hammer position Le and driving loads P1 and P2 are used as the passing data Lea, P1a, and P2a of those Le, P1, and P2 when the nail is driven into the workpiece normally. By discriminating the nail quality in contrast to the above, the nail quality can be reliably inspected with high accuracy.

(Claim 3 )
(d) In the above-mentioned (c), the determination means sets the conditions for determining whether or not to pass the nail quality as Le is Le or higher, P1 is P1a or higher, P2 is P2a or higher, and P2-P1 is a predetermined value or higher. The punching quality can be inspected with higher accuracy.

FIG. 1 is a schematic view showing a nailing machine. FIG. 2 shows a nailing state, (A) is a schematic diagram showing a normal nail driving state, (B) is a schematic diagram showing nail detachment, and (C) is a schematic diagram showing material cracking. FIG. 3 is a diagram showing nail passing data. FIG. 4 is a schematic diagram showing nail driving data when there is no nail. FIG. 5 is a schematic diagram showing nailing data when nailing is not completed. FIG. 6 is a schematic diagram showing nail driving data in the case of detachment. FIG. 7 is a schematic diagram showing nail driving data in the case of cracking wood. FIG. 8 is a schematic diagram showing a data collection method for the nail driving quality discrimination means.

  A nail driving machine 10 shown in FIG. 1 includes a nail holding device 11 that holds a nail 1 (or a staple) that is a material to be driven, and a hammer that drives the nail 1 held by the nail holding device 11 into workpieces 2A and 2B. 12 and a drive device 13 for the hammer 12.

  The nail holding device 11 has a cylindrical guide 11 </ b> A that holds the nail 1. An automatic supply mechanism for the nail 1 may be connected to the cylindrical guide 11A.

  The hammer 12 is preferably made of a material that is harder than the nail 1 and that is not deformed by repeated driving operations. If the nail 1 is an iron nail, the hammer 12 is preferably hardened steel, tool steel, mold material or the like.

  The driving device 13 may be any device that can transmit a driving force to the hammer 12 substantially linearly, and includes a cylinder 13A such as a pneumatic cylinder, a hydraulic cylinder, an electric cylinder, or a linear motion mechanism such as a motor.

  The nailing machine 10 includes a load detection sensor 21 that detects a nail load applied to the hammer 12 and a hammer position detection sensor 22 that detects the position of the hammer 12.

  The load detection sensor 21 may be anything as long as it can detect the reaction force when nailing with the hammer 12. If the nail 1 is an iron nail, it should have a detection capability with a maximum load of 500 kg and a resolution of about 1%. As long as the mounting position of the load detection sensor 21 is a part where the reaction force can be measured, the hammer 12 is driven in either the fixed portion of the driving device 13 (cylinder 13A) shown in FIG. 1 or the mounting portion of the hammer 12 to the cylinder 13A. Any part such as a side tip may be used.

  The hammer position detection sensor 22 may be anything such as an optical or magnetic encoder, a strain gauge type linear gauge, a potentiometer or the like as long as it can detect the position of the hammer 12. At this time, in consideration of the driving speed by the hammer 12, it is necessary to secure a sufficient sampling speed capable of collecting data in units of 1 mm at a minimum. For example, if the movement stroke of the hammer 12 at the time of driving is 50 mm and the driving is completed in 0.1 seconds, a sampling speed of 500 Hz or more is required.

  The nailing machine 10 includes a determination unit 30 that acquires detection data of the load detection sensor 21 and the hammer position detection sensor 22 and determines nail quality based on a transition of a nail load and a hammer position. The discriminating means 30 takes in the detection signals of the load detection sensor 21 and the hammer position detection sensor 22 via the A / D converter 31 to the arithmetic device 32, and extracts and collects specific information from the detection data acquired in the arithmetic device 32. Then, it is judged whether the driving is good or not, and the nail quality is acceptable. The result of acceptance determination by the arithmetic device 32 is displayed on the display 33. The discriminating means 30 may be a personal computer or a sequencer.

The pass determination operation of the determination means 30 is performed according to the following procedure.
(1) Set the nail driving completion load Pe when the nail 1 is driven into the workpieces 2A and 2B. For example, Pe = 200 kg.

  Then, using the detection data acquired from the load detection sensor 21 and the hammer position detection sensor 22, the position Le of the hammer 12 when the nail driving completion load Pe is reached is collected.

  Two positions L1 and L2 of the hammer 12 for checking a nail driving load in an intermediate stage where the nail 1 is driven into the workpieces 2A and 2B are set. For example, L1 = 65 mm and L2 = 75 mm.

  Then, using the detection data acquired from the load detection sensor 21 and the hammer position detection sensor 22, driving loads P1 and P2 at the positions L1 and L2 of the hammer 12 are collected.

  (3) The position Le of the hammer 12 and the driving loads P1 and P2 collected in the above (1) and (2) are used as their Lea (for example Lea) when the nail 1 is driven into the workpieces 2A and 2B in a normal state. = 79 mm), nail driving quality is determined in comparison with P1a (for example, P1a = 25 kg) and P2a (for example, P2a = 25 kg).

  At this time, the determining means 30 has, as acceptance determination conditions for nail driving quality, Le is Lea or more (79 mm or more), P1 is P1a or more (25 kg or more), P2 is P2a or more (25 kg or more), and P2−P1 is 5 kg, for example. That's it.

In the following, an example of nailing with the nailing machine 10 and an example of determining the quality of the nailing quality will be described.
In the nailing machine 10, a compressed air-driven cylinder with an encoder with a stroke of 90 mm is used as the drive device 13 for the hammer 12. A load cell having a maximum measurement load of 500 kg is installed as the load detection sensor 21. The detection signals of the load detection sensor 21 and the hammer position detection sensor 22 are taken into the arithmetic unit 32 by the A / D converter 31 having a sampling speed of 5 msec.

  FIG. 3 shows normal detection data (accepted data) when the nail 1 is driven into the workpieces 2A and 2B satisfactorily by the nailing machine 10. FIG. 3 is a graph in which the horizontal axis indicates the position (movement distance) of the hammer 12 and the vertical axis indicates the nail driving load, and the nail driving load and the hammer position change as follows.

  When the hammer 12 is driven, the nail 1 hits the work 2A at the position (i) and penetrates the work 2A at the positions (ii) to (iii) to start driving into the work 2B (the wood of the work 2A is Since the material is harder than the wood of work 2B, the data is as shown in FIG. At the position (iv), the driving of the nail 1 is completed, and the hammer 12 itself hits the workpiece 2A to be driven.

  In the case of “no nail” when nailing with the nailing machine 10, the detection data is as shown in FIG. Until the hammer 12 hits the wood to be driven, the driving load remains substantially zero.

  When the nail 1 hits a joint or the like in the workpiece 2B and is not driven to the end when nailing with the nailing machine 10, detection data as shown in FIG. 5 is obtained. The hammering completion position of the hammer 12 is different from the normal data in FIG.

  When “nail detachment” occurs at the time of nailing by the nailing machine 10, the detection data is as shown in FIG. The increase in friction between the nail 1 and the wood of the work 2B is eliminated, and the nail driving load becomes flat when the tip of the nail 1 is detached from the wood of the work 2B.

  When a “wood crack” of the workpiece 2B occurs when nailing with the nailing machine 10, detection data as shown in FIG. 7 is obtained. The nailing load suddenly drops from the time when the wood crack occurs, and then leveled off.

  In the discriminating means 30, the nail quality of the nail 1 as shown in FIG. 8 in the above procedure is based on the normal passing data (FIG. 3) when the nail 1 is successfully driven into the workpieces 2A and 2B. Pass / fail judgment is performed.

  First, based on the pass data, the normal nail driving load Pe is set to 200 kg, and the pass data of the position Le of the hammer 12 when the nail driving completion load Pe is reached is set to Lea = 79 mm. Further, the position of the hammer 12 for checking the nailing load is L1 = 65 mm and L2 = 75 mm, and the passing data P1 and P2 at the positions L1 and L2 of the hammer 12 are P1a = 25 kg and P2a = 25 kg.

  The above-mentioned Le, P1, and P2 collected from the detection data at the time of nailing by the nailing machine 10 are compared with the above-mentioned acceptable data Lea, P1a, and P2a, and the nail quality at the time of each nailing is determined. Pass / fail judgment is performed. At this time, the conditions for determining whether or not to pass the nailing quality are as described above: Le is Lea or more (79 mm or more), P1 is P1a or more (25 kg or more), P2 is P2a or more (25 kg or more), and P2-P1 is 5 kg or more, for example. And

  Therefore, when each of the nails shown in FIGS. 3 to 7 is subjected to the above-described acceptance determination conditions in light of the detection data, and the quality of the nailing quality is determined as follows (Table 1).

(Detection data in FIG. 3)
Le = 80mm, which is greater than Lea (= 79mm) and OK, P1 = 87kg, which is greater than P1a (= 25kg) and OK, P2 = 102kg, which is P2a (= 25kg) ) And OK, P2−P1 = 15 kg is 5 kg or more and OK, and all the pass determination conditions are satisfied with OK. That is, the nailing quality at the time of nailing in FIG. 3 is “pass”.

(Detected data in FIG. 4)
Le = 80mm is more than Lea and OK, P1 = 0kg is not more than P1a, NG, P2 = 0kg is not more than P2a, NG, P2-P1 = 0kg is not more than 5kg, NG. Do not meet. That is, the nail quality when nailing in FIG. 4 is “no nail”.

(Detection data in FIG. 5)
Le = 75mm is not more than Lea, NG, P1 = 87kg is more than P1a and OK, P2 = 280kg is more than P2a and OK, P2-P1 = 163kg is more than 5kg and OK, all pass judgment The condition is not met. That is, the nailing quality at the time of nailing in FIG. 5 is “nailing not completed”.

(Detection data in FIG. 6)
Le = 80mm is over Lea and OK, P1 = 82kg is over P1a and OK, P2 = 81kg is over P2a and OK, P2-P1 = −1kg is not over 5kg but NG, all passed The judgment condition is not satisfied. That is, the nailing quality at the time of nailing in FIG.

(Detection data in FIG. 7)
Le = 80mm is more than Lea and OK, P1 = 48kg is more than P1a and OK, P2 = 47kg is more than P2a and OK, P2-P1 = -1kg is not more than 5kg but NG, all passed The judgment condition is not satisfied. That is, the nail quality when nailing in FIG. 7 is “material cracking”.

According to the present embodiment, the following operational effects can be obtained.
(a) Since the nail driver 10 includes the load detection sensor 21, the hammer position detection sensor 22, and the determination means 30, the determination means 30 acquires the detection data of the load detection sensor 21 and the hammer position detection sensor 22, and the nail The nailing quality is determined based on the transition of the hammering load and the hammer position. Thereby, it is possible to detect nailing defects such as detachment of nails and cracking of wood.

  (b) The discriminating means 30 sets the nail driving completion load Pe when the nail 1 has been driven into the workpieces 2A and 2B, and collects the position Le of the hammer 12 when the nail driving completion load Pe is reached. Set the two points L1 and L2 of the hammer 12 for checking the nail driving load in the intermediate stage of driving the nail 1 into the workpieces 2A and 2B, and take the driving loads P1 and P2 at the positions L1 and L2 of the hammer 12 The position Le of the hammer 12 and the driving loads P1 and P2 are set to pass data Lea, P1a, and P2a of those Le, P1, and P2 when the nail 1 is driven into the workpieces 2A and 2B normally. By contrasting the nail quality, the nail quality can be reliably inspected with high accuracy.

  (c) In the above-described (b), the determination means 30 sets Le as Le or higher, P1 as P1a or higher, P2 as P2a or higher, and P2−P1 as a predetermined value or higher as the nail driving quality determination criteria. Nail driving quality can be inspected with higher accuracy.

  In the present invention, the discrimination means sets the nail driving completion load Pe when the nail is driven into the work, and collects the hammer position Le when the nail driving load Pe is reached. At the same time, a hammer position L for checking the nail driving load in the intermediate stage of driving the nail into the workpiece is set, the driving load P at the hammer position L is sampled, and the hammer position Le and the driving load P are set as follows. It is also possible to determine the nail driving quality in comparison with those Le and P pass data Lea and Pa when the nail is driven into the work well.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and even if there is a design change or the like without departing from the gist of the present invention. It is included in the present invention.

  The present invention acquires detection data of a load detection sensor and a hammer position detection sensor, and determines nail driving quality based on transition of a nail driving load and a hammer position. As a result, the nailing quality can be inspected and managed with high accuracy. In particular, it is possible to detect nailing failures that cannot be found without observing the back surface of the nailing portion, and nailing defects such as wood cracks that are difficult to visually judge. The reliability of nailing products can be significantly improved.

DESCRIPTION OF SYMBOLS 1 Nail 2A, 2B Work 10 Nail driver 11 Nail holding device 12 Hammer 13 Drive device 21 Load detection sensor 22 Hammer position detection sensor 30 Discrimination means

Claims (3)

A nail holding device for holding the nail;
A hammer for driving the nail held by the nail holding device into the workpiece;
In a nailing machine having a hammer drive device,
A load detection sensor for detecting a nailing load applied to the hammer;
A hammer position detection sensor for detecting the position of the hammer;
Acquires detection data of the load detection sensor and the hammer position detection sensor, Ri Na and a discriminating means for discriminating the nailing quality on the basis of transition of the position of the nailing load and hammers,
The discrimination means is
The nail driving completion load Pe when the nail has been driven into the workpiece is set, and the hammer position Le when the nail driving load Pe is reached is sampled.
A hammer position L for checking the nail driving load in the intermediate stage of driving the nail into the workpiece is set, and the driving load P at the hammer position L is sampled.
The nail quality is determined by comparing the hammer position Le and the driving load P with those Le and P passing data Lea and Pa when the nail is driven into the workpiece normally. Nailing machine to do. The discrimination means is
Two points, hammer positions L1 and L2, for checking the nailing load in the intermediate stage of driving the nail into the workpiece are set, and the hammering loads P1 and P2 at the hammer positions L1 and L2 are sampled.
The hammer position Le and driving loads P1 and P2 are compared with the passing data Lea, P1a and P2a of Le, P1 and P2 when the nail is driven into the workpiece normally. The nailing machine according to claim 1 , wherein the nailing machine is identified. The discrimination means is
3. The nailing machine according to claim 2 , wherein the conditions for determining whether or not to pass the nail quality are Le equal to or greater than Le, P1 equal to or greater than P1a, P2 equal to or greater than P2a, and P2-P1 equal to or greater than a predetermined value.

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