JPH04113905U - Woodworking machine safety device and board thickness detection device - Google Patents

Abstract

(57) [Summary] (with amendments) [Purpose] To ensure the prevention of malfunction of the plate thickness detection device and safety device used in wood processing machines, especially super finishing plane machines, and to facilitate maintenance in the event of failure. Make it cheap. [Structure] The processing means 3, which can be raised and lowered, is provided with a plate thickness detection switch LS ₂ on the material feeding path side for detecting the plate thickness of the processed material W. The mounting table 2 is provided with an operation prohibition limit switch LS ₁ on the material feeding path side, and is connected in series with the plate thickness detection switch LS ₂ . The feeding means 5 and M are operated only when the plate thickness detection switch LS ₂ and the operation inhibiting limit switch LS ₁ are turned on at the same time. In addition, the plate thickness detection device is composed of one limit switch and three relay circuits.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a safety device and a plate thickness detection device for wood processing machines, especially for super-finishing. This article relates to improved technology for plate thickness detection devices and safety devices used in planing machines.

0002

[Conventional technology]

FIG. 4 shows a partial front cross-sectional view of a conventional superfinishing planer. A conventional super-finishing planer 50 includes a planer stand 2 on which a workpiece W is placed horizontally movably; A head portion 3 arranged to be movable up and down by a lifting motor BM, and a lifting motor BM. and an operation section 51 for driving the head section 3 to move the head section 3 up and down.

The plane stand 2 includes a feed belt 5 for conveying the workpiece W, and a belt drive motor M for driving the feed belt 5. The head section 3 includes a head stock section 4 provided with a thickness detection limit switch LS ₂ for detecting the thickness of the workpiece W, and a knife stock section in which a planer blade 10 for actual cutting is stored. It is equipped with 9 and.

[0004] The operation unit 51 includes a rise button 52 for raising the head part 3 by the lifting motor BM, and a lowering button 53 for lowering the head part 3 by the lifting motor BM. There is. When the plate thickness of the workpiece W is detected by the plate thickness detection limit switch LS ₂ of the headstock section 4, a plate thickness detection device (not shown) configured with a plurality of ICs (Integrated Circuits) detects the feed belt. 5 was driven to transport the material W to be cut below the head section 3, and the knife stock section 9 was used to perform a certain amount of cutting.

More specifically, when the material to be cut W is inserted into the material insertion side of the lower surface of the headstock portion 4 and the lowering button 53 is pressed, the plate thickness detection device drives the lifting motor BM. As a result, the head portion 3 is guided by the guide bars 12, 12 via the lifting screw 11 and lowered. Thereafter, when the workpiece W comes into contact with the detection plate 21 and the thickness is detected by turning on the thickness detection limit switch LS ₂ , the thickness detection device stops driving the lifting motor BM and moves the head Stop the lowering of section 3.

[0006] Further, the plate thickness detecting device drives the belt drive drive motor M to drive the feed belt. drive the cutter 5 to transport the workpiece W below the knife stock part 9 of the head part 3 and place it there. It was designed to cut to a constant thickness.

[0007]

[Problem that the idea aims to solve]

When moving the above-mentioned conventional super-finishing planer, the operator may carry it by holding both longitudinal ends of the head section 3, but at this time, the operator should not carry the super-finishing planer with the power turned on. There was a problem in that when the feed belt 5 was in use, the plate thickness detection limit switch LS ₂ was erroneously pushed up with a finger, causing the belt drive motor M to be driven and the finger to be caught in the feed belt 5.

[0008] In addition, conventional plate thickness detection devices often use ICs and have a large number of parts. Therefore, there are many work steps during manufacturing, which makes work efficiency poor, and it is difficult to identify the defective part in the event of a failure. The problem was that it was difficult to do so. Furthermore, since ICs are expensive, There was a problem that the cost would increase. Therefore, this invention not only ensures the prevention of malfunctions, but also provides maintenance support in the event of a failure. To provide a safety device and a board thickness detection device for wood processing equipment that is easy to install and inexpensive. With the goal.

[0009]

[Means to solve the problem]

In order to solve the above problems, the first idea was to develop a feeding means for feeding the workpiece material during processing. and a mounting table on which the workpiece material is placed; A processing means that forms a material feeding path between the mounting table and the processing means that processes the material to be processed. and an elevating means for elevating the processing means, according to the thickness of the material to be processed. This is a safety device for a woodworking processing machine that performs processing, wherein the processing means is connected to the material feeding path. A plate thickness detection switch for detecting the plate thickness of the workpiece material is provided on the side, and the mounting table includes: A safety switch connected in series with the plate thickness detection switch is provided on the material feeding road side, and Only when the board thickness detection switch and the safety switch are turned on at the same time It is configured to cause the feeding means to operate.

0010 The second invention also includes a processing means for processing the material to be processed, and an elevation of the processing means. comprising a lifting means for lowering the material and a feeding means for transporting the material to be processed during processing; In the plate thickness detection device of a wood processing machine that performs processing according to the thickness of the workpiece material, the front The board thickness detection device includes a board thickness detection switch that detects the board thickness of the material to be processed; a first relay circuit that drives the feeding means when the thickness of the material to be processed is detected; Before detecting the thickness of the material to be processed, power for lowering is supplied to the elevating means, and the When the thickness of the processed material is detected, power is supplied to the first relay circuit and the circuit. a second relay circuit for supplying power and inhibiting the lowering operation of the lifting means; and At the time of the lifting operation of the means, power for raising is supplied to the lifting means, and the first and a third relay circuit that prohibits operation of the relay circuit and the second relay circuit. and configure it.

[0011]

[Effect]

According to the first invention, the safety device is a plate thickness sensor installed on the material feeding path side of the processing means. The switch and the safety switch installed on the material transport side of the loading table were turned on at the same time. The operation of the feeding means is performed only in this case. Therefore, it is less likely that two switches will be turned on by mistake, so wood processing Prevents panel malfunction.

0012 According to the second invention, the plate thickness detection switch detects the plate thickness of the workpiece material. A first relay circuit drives the feeding means when the thickness of the workpiece material is detected. Ru. A second relay circuit connects the lifting means to a lowering means before detecting the thickness of the workpiece material. When power is supplied and the thickness of the workpiece material is detected, the first relay circuit and and supplies power to the circuit, and prohibits the lowering operation of the elevating means. Third The relay circuit supplies lifting power to the lifting means during the lifting operation of the processing means. and prohibits the operation of the first relay circuit and the second relay circuit.

[0013] Therefore, it is possible to configure a plate thickness detection device with one switch and three relay circuits. This simplifies the configuration.

[0014]

【Example】

An embodiment of the present invention will be described with reference to FIGS. 1 to 3. Figure 1 shows a partially sectional front view of the super-finishing planer according to the present invention, and Figure 2 shows a partially enlarged view. Show the big picture. The super-finishing planer 1 includes a planer stand 2 on which a material to be cut W is placed horizontally movably; The head part 3 is arranged upwardly so as to be movable up and down.

The plane stand 2 is provided with a feed belt 5 for feeding the workpiece W, and a belt drive motor M for driving the feed belt 5. The feed belt 5 is supported by a plurality of receiving rollers 8, and when a driven roller 7 and a drive roller (not shown) rotate about a rotating shaft 6, the material to be cut W is sent below the head portion 3. The head section 3 includes a head stock section 4 provided with a thickness detection limit switch LS ₂ for detecting the thickness of the workpiece W, and a knife stock section in which a planer blade 10 for actual cutting is stored. It is equipped with 9 and.

[0016] The knife stock part 9 is provided with a planer blade 10 having a predetermined distance, and the head The blade contact position is set according to the vertical movement depending on the thickness of the material W to be cut in section 3. The material to be cut W is cut more easily. The head portion 3 is raised and lowered by a lifting motor BM via a lifting screw 11. As a result, the head section 3 is guided by the guide bars 12, 12 and moves up and down. Lifting motor The motor BM is driven by operating a foot switch (not shown).

[0017] The plate thickness is detected by plate thickness detection switches located above and below the supply port for the material W to be cut to the superfinishing planer 1, that is, at the lower part of the head portion 3 and the upper part of the planer stand 2 so as to be substantially opposite to each other. A plate thickness detection limit switch LS ₂ and an operation prohibition limit switch LS ₁ as a safety switch that prohibits operation of the belt drive motor are provided.The belt drive is disabled unless both limit switches LS ₁ and LS ₂ are turned on. The motor M is set not to operate.

The operation prohibition limit switch LS ₁ is attached to a limit switch mounting plate 18 fixed with screws 19 inside the front surface plate 17 of the superfinish planing machine 1 . A limit switch plate 31 whose one end is fixed with a screw 41 is provided inside the front surface plate 17, and the other end of the limit switch plate 31, which is a free end 31a, forms a convex portion 31b at a slightly fixed end side. It is installed so as to slightly protrude from the upper surface of the front surface plate 17 so as to come into contact with the workpiece W, and when this protrusion 31b comes into contact with the workpiece W and is pushed down, the operation is prohibited. It turns on limit switch _LS1 .

The plate thickness detection limit switch LS ₂ is attached to a limit switch mounting plate 23 in the headstock section 4 that is integrally formed with the knife stock section 9 . A detection plate 21 whose one end is fixed with a screw 16 is provided on the protrusion 15 protruding from the inside of the headstock part 4, and the other end of the detection plate 21 is a free end curved downward in an arc shape. When 21a comes into contact with the workpiece W and is pushed upward, the plate thickness detection limit switch _LS2 is turned on.

Next, the main operations of the superfinish planer will be explained. When the wood that is the material to be cut W is placed in contact with the limit switch plate 31 and the lowering pedal of the foot switch is depressed with the operation prohibition limit switch LS ₁ turned on, the lifting motor BM is activated. The head section 3 descends. As a result, the headstock portion 4 approaches the wood and comes into contact with the detection plate 21, and when the plate thickness detection limit switch LS ₂ is turned on, the operation of the lifting motor BM is stopped and the belt drive motor M is activated. do. Then, when the wood is pushed into the material feeding path at the bottom of the head section 3, the wood is fed by the feeding belt 5, is planed by a planer blade 10 to a predetermined thickness, and then sent to the rear surface plate. When the lift pedal of the foot switch is pressed here, the operation of the belt drive motor M is stopped, and the lifting motor BM is operated to raise the head portion 3.

FIG. 3 shows a sequence diagram of a plate thickness detection circuit having a safety device of the present invention. In FIG. 3, when the down button (down pedal of the foot switch) 13 is pressed, the a contact (normally closed contact) of the up button (the up pedal of the foot switch) 14 is S _Ua and the b contact (normally open contact) of the down button 13 is pressed. Power for lowering is supplied to the lifting motor BM via S _Db , the second a contact S _STa2 of the stop button STP, and the a contact S _R2a of the relay R2, and the head portion 3 is lowered. Further, when the rise button 14 is pressed, the relay R3 is energized via the b contact S _Ub of the rise button, the a contact S _R3a of the relay R3 is turned off, and the b contact S _R3b is turned on. As a result, power for lifting is supplied to the lifting motor via the b contact S _Ub of the lifting button and the b contact S _R3b of the relay R3, and the head portion 3 is raised. Both the lowering button 13 and the higher button 14 are manually operated automatic return contacts, so they are valid only while the buttons are pressed. Further, if the down button 13 and the up button 14 are pressed at the same time, only the up button 14 is activated as a fail-safe.

[0022] Operation prohibition limit switch LS₁and plate thickness detection limit switch LS₂is direct relay R1 and relay R2 only when both switches are on. Power is applied. When both switches are turned on, the b contact S of relay R1_R1bis on Then, the belt drive motor M operates, and the workpiece W is moved to the head by the feed belt 5. It will be sent below the door section 3. Also, b contact S of relay R2_R2bGao and maintains that state. As a result, from then on, the b contact S of relay R2 _R2b , the first a contact S of the stop button STP_STa1, a contact S of relay R3 _R3a Relay R1 and relay R2 are always energized via Even after the cutting of the material W is finished, the belt drive motor M continues to operate. However, by pressing the rise button 14 or the stop button STP, the relay R2 is in a de-energized state, and as a result, relay R1 is also de-energized and is used for belt drive. Motor M stops.

In the above embodiment, by connecting the operation prohibition limit switch L S ₁ as a safety switch in series with the plate thickness detection limit switch LS ₂ , both limit switches LS ₁ and LS ₂ must be turned on. For example, the belt drive motor M is not driven, so even if an operator accidentally pushes up the plate thickness detection limit switch LS ₂ while holding both longitudinal ends of the head part 3 while the power is on, Since the belt drive motor M is not driven, worker safety can be ensured.

[0024] In addition, the plate thickness detection circuit consists of one limit switch and three relay circuits. It is simplified compared to the conventional plate thickness detection circuit using IC. , the number of parts mounted on the circuit board is reduced, reducing work processes and improving reliability. do. Furthermore, it is easier to identify the location of the failure.

[0025]

[Effect of the idea]

According to the first invention, the thickness of the material to be processed is detected on the material feeding path side of the processing means. A plate thickness detection switch is installed and connected in series with the plate thickness detection switch on the material feeding path side of the loading table. The plate thickness detection switch and safety switch are turned on at the same time. The feed means is operated only when the operator moves the woodworking machine. Since both switches are not turned on at the same time, this prevents malfunction of the feeding means. This has the effect of ensuring worker safety.

[0026] According to the second idea, a plate thickness detection device is constructed with one switch and three relay circuits. This simplifies the configuration and reduces the number of components mounted on the circuit board. This reduces work processes, improves reliability, and makes it easier to identify failure locations. It has the effect of

[Brief explanation of drawings]

FIG. 1 is a front partial cross-sectional view of an embodiment of the present invention.

FIG. 2 is a partially enlarged view of FIG. 1;

FIG. 3 is an operation sequence diagram of the embodiment of FIG. 1;

FIG. 4 is a front partial sectional view of a conventional example.

[Explanation of symbols]

1... Super finishing planer 2... Planer stand 3... Head part 4... Head stock part 5... Feeding belt 6... Rotating shaft 7... Follower roller 8... Receiving roller 9... Knife stock part 10... Planer blade 11... Lifting screw 12... Guide Bar 13...Down button 14...Up button 15...Protrusion 16...Screw 17...Front surface plate 19...Screw 21...Detection plate 21a...Free end 23...Limit mounting plate 31...Limit switch plate 31a...Free end 31b...Protrusion BM...Lifting motor LS ₁ ...Operation prohibition limit switch LS ₂ ...Plate thickness detection limit switch M...Belt drive motor S _R2a , S _R3a , S _Ua , S _STa1 , S _STa2 ...A contact S _R1b , S _R2b , S _R3b , S _Ub , S _Db ...B contact STP...Stop button W...Work material

Claims (2)

[Scope of utility model registration request] 1. A material feeding path is provided between a loading table on which the workpiece material is placed and a loading table provided above the loading table, comprising a feeding means for conveying the workpiece material during processing. A safety device for a woodworking machine that processes the work material according to the thickness of the work material, comprising a processing means for processing the work material, and an elevating means for raising and lowering the processing means, , the processing means has a plate thickness detection switch on the material feeding road side for detecting the thickness of the workpiece material, and the mounting table has a safety switch connected in series with the plate thickness detection switch on the material feeding road side. A safety device for a woodworking machine, comprising a switch, and operating the feeding means only when the board thickness detection switch and the safety switch are turned on at the same time. 2. A processing means for processing a workpiece material, an elevating means for raising and lowering the processing means, and a feeding means for feeding the workpiece material during processing, according to the thickness of the workpiece material. In the board thickness detection device for a woodworking processing board that performs processing, the board thickness detection device includes a board thickness detection switch that detects the board thickness of the workpiece material, and a board thickness detection switch that detects the board thickness of the workpiece material. , a first relay circuit for driving the feeding means, and supplying power for lowering to the elevating means before detecting the thickness of the material to be processed; and when the thickness of the material to be processed is detected; a first relay circuit and a second relay circuit that supplies power to the circuit and prohibits the lowering operation of the lifting means; 1. A board thickness detection device for a woodworking processing board, comprising: a first relay circuit and a third relay circuit that inhibits the operation of the second relay circuit.