JP7349856B2 - Door locking mechanism - Google Patents

Description

The present invention relates to a door locking mechanism.

Various types of equipment, such as processing equipment, have a housing that covers the outside of the equipment to ensure the safety of operators and prevent internal dust from being discharged, and are configured so that the inside can be accessed through opening and closing doors at the positions where operation is required. is known (see Patent Document 1).

Japanese Patent Application Publication No. 2005-046979

Various types of equipment equipped with such housings are designed for safety so that if the opening/closing door is open, the operator is considered to have entered the equipment, and the equipment cannot be operated unless the opening/closing door is closed. In many cases. Therefore, the opening/closing door needs to detect the opening/closing state, and is often equipped with an optical opening/closing sensor, for example. Furthermore, a locking mechanism is also required that can maintain the closed state so that the door does not open half-open. However, since the locking function and the opening/closing detection function using the opening/closing sensor are completely separate functions, various conventional devices have been equipped with a component that implements the locking function and a component that implements the opening/closing detection function. For this reason, it has been desired that various devices have a locking function and an opening/closing detection function implemented in a single component.

The present invention has been made in view of such problems, and an object of the present invention is to provide a door locking mechanism that can realize a locking function and an opening/closing detection function with one component.

In order to solve the above-mentioned problems and achieve the objects, the door locking mechanism of the present invention is a door locking mechanism that detects the opening/closing of an opening/closing door arranged at the opening of a housing, A circuit consisting of a magnet fixed to the end, a main body fixed to the housing at a position facing the magnet of the opening/closing door in the closed state, and the main body, and the opening/closing of the circuit. a detection circuit for detecting the opening/closing of the opening/closing door, and the main body includes a non-conductive base portion having a support surface facing the opening/closing door in the closed state; a metal member fixed to a support surface and attracting the magnet of the opening/closing door to maintain the opening/closing door in a closed state, and a metal member disposed in a through hole extending from the support surface of the base portion to the back surface on the opposite side; A switch rod whose tip protrudes from the support surface under the force of an elastic member and whose rear end is made of a conductive material, a + terminal to which the + side wiring of the detection circuit is connected, and a - side wiring of the detection circuit are connected. a pair of terminal parts fixed to the back side of the base part spaced apart from each other across the through hole, and the switch rod is pressed by the opening/closing door in the closed state. The rear end side contacts the pair of terminal portions and closes the detection circuit to detect the closed state of the opening/closing door.

The present invention can realize the locking function and the opening/closing detection function with one component.

FIG. 1 is a perspective view showing a configuration example of a processing device in which a door locking mechanism according to an embodiment is used. FIG. 2 is a sectional view showing an open state of the door locking mechanism according to the embodiment. FIG. 3 is a sectional view showing a closed state of the door locking mechanism according to the embodiment. FIG. 4 is a sectional view showing a main part of the door locking mechanism in an open state according to the embodiment. FIG. 5 is a sectional view showing a main part of the door locking mechanism in the closed state according to the embodiment.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Modes (embodiments) for carrying out the present invention will be described in detail with reference to the drawings. The present invention is not limited to the contents described in the following embodiments. Further, the constituent elements described below include those that can be easily assumed by those skilled in the art and those that are substantially the same. Furthermore, the configurations described below can be combined as appropriate. Further, various omissions, substitutions, or changes in the configuration can be made without departing from the gist of the present invention.

[Embodiment]
A door locking mechanism 1 according to an embodiment of the present invention will be described based on the drawings. FIG. 1 is a perspective view showing a configuration example of a processing apparatus 100 in which a door locking mechanism 1 according to an embodiment is used. As shown in FIG. 1, the door locking mechanism 1 is a mechanism that detects the opening/closing of the opening/closing door 4 disposed in the opening 3 of the housing 2 of the processing apparatus 100. In the following, the X-axis direction is one horizontal direction, the Y-axis direction is another horizontal direction and a direction perpendicular to the X-axis direction, and the Z-axis direction is the same as the X-axis direction and the Y-axis direction. This is a direction perpendicular to both the axial direction and parallel to the vertical direction.

The door lock mechanism 1 according to the embodiment constitutes a processing device 100. In this embodiment, the processing device 100 is a cutting device that cuts the workpiece 200, but the present invention is not limited to this, and the processing device 100 irradiates the workpiece 200 with a laser to perform laser processing on the workpiece 200. It may be a laser processing device that grinds one surface of the workpiece 200, a grinding device that grinds one surface of the workpiece 200, or the like.

In this embodiment, the workpiece 200 to be cut by the processing apparatus 100 is, for example, a disk-shaped semiconductor wafer or an optical device wafer made of silicon, sapphire, silicon carbide (SiC), gallium arsenide, or the like. It's a wafer. As shown in FIG. 1, the workpiece 200 has a device 203 formed in each region of the surface 201 divided by a plurality of intersecting (in this embodiment, perpendicular) dividing lines 202. An adhesive tape 205 is attached to the back surface 204 of the back side, and an annular frame 206 is attached to the outer edge of the adhesive tape 205. Note that the workpiece 200 is not limited to this in the present invention, and may be a package substrate in which the device 203 is sealed with resin, a ceramic plate, a glass plate, or the like.

As shown in FIG. 1, the processing apparatus 100 includes a holding table 110, a processing unit 120 that performs cutting, a movement unit 130, a cleaning unit 140, a transport unit 150, a cassette stand 160, and a cassette 170. , and a control unit 180 that controls each unit. As shown in FIG. 1, the processing apparatus 100 is a so-called facing dual type cutting apparatus that includes two processing units 120, that is, a two-spindle dicer. Each unit of the processing device 100 is covered with a housing 2 on the outside.

The holding table 110 holds the workpiece 200 from the back surface 204 side via the adhesive tape 205. The holding table 110 includes a disk-shaped suction section made of porous ceramic or the like, which has a holding surface formed on its top surface and a large number of porous holes, and a frame that fits and fixes the suction section into a depression in the center of the top surface. It has a disc shape with a body. The holding table 110 has a suction section connected to a vacuum suction source (not shown) via a vacuum suction path (not shown), and suctions and holds the workpiece 200 on the entire holding surface. The holding table 110 is movable in the X-axis direction by a moving unit (not shown) disposed below the holding table 110, and is rotatably provided by a rotational drive source (not shown).

The processing unit 120 cuts the workpiece 200 held on the holding table 110 along the planned dividing line 202 . The processing unit 120 includes a cutting blade and a spindle. The cutting blade is rotated about the Y axis to cut the workpiece 200 held on the holding table 110. The spindle is provided along the Y-axis direction, and supports a cutting blade rotatably around the Y-axis at its tip. The processing unit 120 is provided movably in the Y-axis direction and the Z-axis direction by a moving unit 130.

The moving unit 130 processes and feeds the holding table 110 along the X-axis direction relative to the processing unit 120. The moving unit 130 indexes and feeds the processing unit 120 along the Y-axis direction relative to the holding table 110. The moving unit 130 cuts and feeds the processing unit 120 along the Z-axis direction relative to the holding table 110.

The cleaning unit 140 cleans the workpiece 200 after cutting. The transport unit 150 transports the workpiece 200 between the holding table 110, the cleaning unit 140, and the cassette 170 installed on the cassette table 160. The cassette stand 160 is a stand on which the cassette 170 is removably installed. The cassette 170 accommodates the workpiece 200 before and after cutting.

Further, as shown in FIG. 1, the processing device 100 includes a housing 2, an opening 3, an opening/closing door 4, a handle 5, and a door locking mechanism 1. The housing 2 covers the outside of the holding table 110, the processing unit 120, the moving unit 130, the cleaning unit 140, the transport unit 150, the cassette stand 160, and the cassette 170 of the processing apparatus 100, and is, for example, a transparent case, so that the operator can The inside can be visually recognized from the outside through the casing 2. The opening 3 is formed on one of the surfaces constituting the casing 2, penetrating the casing 2, and allows an operator to work from the outside through the opening 3 to the inside.

The opening/closing door 4 is arranged in the opening 3 of the housing 2. The opening/closing door 4 is movably arranged with respect to the housing 2, and opens and closes the opening 3 as it moves in the opening/closing direction. In this embodiment, the opening/closing door 4 has one end in the width direction connected to one side end on the same side of the opening 3 of the housing 2 so as to be rotatably movable around an axis parallel to the Z-axis direction. ing. When the opening/closing door 4 rotates around this axis, the other end in the width direction moves, for example, on a circumferential track in FIG. 1 . The opening/closing door 4 closes the opening 3 by having its other end closest to and in contact with the other side edge of the inner edge of the opening 3 of the housing 2 on the same side as the other end of the opening/closing door 4. When the other end of the opening/closing door 4 moves away from the other side end of the opening 3 of the housing 2 toward the front in FIG. 1, the opening 3 becomes at least partially open.

The handle 5 is provided so as to protrude from the other end of the closed door 4 to the outside of the housing 2, and can be gripped by an operator from the outside. Therefore, when the handle 5 is grasped from the outside by the operator, the door 4 can be rotated around the axis between the open state and the closed state.

The control unit 180 controls each unit and other components of the processing apparatus 100 to cause the processing apparatus 100 to perform various operations related to cutting the wafer 200. Control unit 180 includes a computer system in the first embodiment. The control unit 180 includes an arithmetic processing device having a microprocessor such as a CPU (central processing unit), a storage device having a memory such as ROM (read only memory) or RAM (random access memory), and an input/output interface device. and has. The arithmetic processing device performs arithmetic processing according to a computer program stored in the storage device, and sends control signals for controlling the processing device 100 to the configuration of each unit of the processing device 100 via the input/output interface device. Output to element.

When the opening/closing door 4 is in the closed state, the processing apparatus 100 is in a state in which the inside of the housing 2 is isolated from the outside, and cutting of the workpiece 200 is permitted. The processing apparatus 100 cuts the workpiece 200 in the following procedure. That is, in the processing apparatus 100 , the transport unit 150 takes out one workpiece 200 from the cassette 170 on the cassette table 160 and places it on the holding table 110 . The processing device 100 plans to separate the holding table 110 and the processing unit 120 using the moving unit 130 while sucking and holding the workpiece 200 on the holding table 110 and supplying cutting water to the workpiece 200 from the processing unit 120. While relatively moving along the line 202, the processing unit 120 cuts the planned dividing line 202 of the workpiece 200. After cutting all of the planned dividing lines 202 of the workpiece 200, the processing apparatus 100 cleans the workpiece 200 with the cleaning unit 140, and then stores the workpiece 200 in the cassette 170.

For example, when the processing device 100 finishes cutting all the workpieces 200 in the cassettes 170 on the cassette table 160, the operator of the processing device 100 moves the other end of the closed door 4 toward the front side. After rotationally moving the opening/closing door 4 to open state, the cassette 170 containing only the cut workpiece 200 is carried out from the outside of the housing 2 through the opening 3 from the cassette stand 160, and a new one is placed. Next, the cassette 170 containing the workpiece 200 before cutting is carried onto the cassette stand 160 and installed therein.

As shown in FIG. 1, the door locking mechanism 1 includes a magnet 10 fixed to the other end of the opening/closing door 4, and a magnet 10 fixed to the housing 2 at a position facing the magnet 10 of the opening/closing door 4 in the closed state. The detection circuit 30 is a circuit configured via the main body 20 and detects opening/closing of the door 4 by opening/closing of the circuit. In this embodiment, the magnet 10 is provided at the other end of the opening/closing door 4. In this embodiment, the main body 20 is provided in a region of the opening 3 of the housing 2 facing the other end of the closed door 4, that is, at the other side end of the opening 3 of the housing 2. .

FIG. 2 is a sectional view showing the door locking mechanism 1 according to the embodiment in an open state. FIG. 3 is a sectional view showing a closed state of the door locking mechanism 1 according to the embodiment. FIG. 4 is a sectional view showing essential parts of the door locking mechanism 1 in an open state according to the embodiment. FIG. 5 is a sectional view showing the main parts of the door locking mechanism 1 in the closed state according to the embodiment.

The magnet 10 has a generally rectangular plate shape and is made of a magnetic material having ferromagnetism. The magnet 10 has an opposing surface 11 and a through hole 12, as shown in FIGS. 2 and 3. The magnet 10 is embedded in the other end of the opening/closing door 4 on the side facing the main body 20 . The opposing surface 11 is a surface that faces the main body portion 20 when the opening/closing door 4 is in the closed state, and is formed flat. The opposing surface 11 is formed to be substantially flush with the inner surface 4-1 of the opening/closing door 4 when the opening/closing door 4 is in the closed state.

The through hole 12 penetrates the magnet 10 in a direction perpendicular to the facing surface 11. The through hole 12 communicates with a through hole 4-2 that penetrates the opening/closing door 4 in a direction orthogonal to the inner surface 4-1. The handle 5 is attached to the opening/closing door 4 by inserting both ends into the through holes 4-2 and 12 and fastening with a screw 5-1 inserted into the through hole 12.

The magnet 10 is firmly attached to the door 4 by being sandwiched between a handle 5 attached to the door 4 and a screw 5-1 to which the handle 5 is attached. Further, the screw 5-1 that attaches the handle 5 is inserted with its head completely embedded in the magnet 10 side, and does not protrude from the opposing surface 11 to the inside of the opening/closing door 4.

As shown in FIGS. 2, 3, 4, and 5, the main body section 20 includes a base section 21, a metal member 22, a switch rod 23, a pair of terminal sections 24, screws 26, 27, It has an elastic member 28.

The base portion 21 is non-conductive, that is, electrically insulating, and is formed in the shape of a generally rectangular parallelepiped block. The base portion 21 is, for example, a non-conductive resin block. As shown in FIGS. 4 and 5, the base portion 21 has a support surface 21-1, a back surface 21-2, a through hole 21-3, and two through holes 21-4.

The support surface 21-1 is a surface that faces the facing surface 11 of the magnet 10 via the metal member 22 of the base portion 21 when the opening/closing door 4 is in the closed state, and is formed flat. The back surface 21-2 is a surface of the base portion 21 opposite to the support surface 21-1, and is formed flat like the support surface 21-1 and generally parallel to the support surface 21-1. There is. The through hole 21-3 extends through the base portion 21 in the central region of the support surface 21-1 from the support surface 21-1 to the back surface 21-2 in a direction perpendicular to the support surface 21-1. The two through holes 21-4 are provided at positions sandwiching the through hole 21-3 between them, and extend from the support surface 21-1 to the back surface 21-2 in a direction generally parallel to the through hole 21-3. It passes through the base portion 21. The two through holes 21-4 have thread grooves formed near the support surface 21-1 and near the back surface 21-2.

The metal member 22 is fixed to the support surface 21-1 of the base portion 21, and when the door 4 is in the closed state, the magnet 10 of the door 4 is attracted to the metal member 22 to maintain the door 4 in the closed state. A door locking mechanism 1 realizes a locking function to maintain the closed state of the opening/closing door 4. The metal member 22 is formed into a rectangular plate shape roughly along the support surface 21-1 direction, and the area in the support surface 21-1 direction is approximately the same as the support surface 21-1 of the base portion 21. has been done. The metal member 22 is formed of a material that generates a predetermined attractive force between the metal member 22 and the magnet 10 depending on the ferromagnetism of the magnet 10 .

As shown in FIGS. 4 and 5, the metal member 22 has a suction surface 22-1, a through hole 22-2, and two through holes 22-3. The attraction surface 22-1 is a surface that faces the opposing surface 11 of the magnet 10 when the door 4 is in the closed state, attracts the opposing surface 11 of the magnet 10, and is formed flat. The through hole 22-2 penetrates the metal member 22 in the central region of the suction surface 22-1 in a direction perpendicular to the suction surface 22-1. In this embodiment, the diameter of the through hole 22-2 is larger than that of the through hole 21-3 of the base portion 21. The two through holes 22-3 are provided at positions sandwiching the through hole 22-2 between them, and penetrate the metal member 22 in a direction generally parallel to the through hole 22-2.

The through hole 21-4 of the base portion 21 and the through hole 22-3 of the metal member 22 communicate with each other, as shown in FIGS. 4 and 5. The two screws 26 are inserted into the through holes 22-3 and 21-4 that communicate with each other from the metal member 22 side, and are screwed into the thread grooves of the through holes 21-4, thereby fixing the base part. A metal member 22 is screwed to the support surface 21-1 side of 21.

As shown in FIGS. 4 and 5, the switch rod 23 is a generally cylindrical rod-shaped member, and is disposed within the through hole 21-3 of the base portion 21. As shown in FIGS. The switch rod 23 has a thickness corresponding to the length in the longitudinal direction from the support surface 21-1 to the back surface 21-2 of the base portion 21, and a thickness in the direction perpendicular to the suction surface 22-1 of the metal member 22. It is formed a little longer than the total thickness.

As shown in FIGS. 4 and 5, the switch rod 23 has a tip 23-1, a rear end 23-2, and an insulating spacer 23-3. The tip 23-1 protrudes from the insulating spacer 23-3 toward the support surface 21-1 of the base portion 21. The rear end 23-2 protrudes from the insulating spacer 23 toward the back surface 21-2 side of the base portion 21. Further, the tip 23-1 and the rear end 23-2 are formed to protrude in the radial direction with respect to the insulating spacer 23-3 of the switch rod 23, so that the tip 23-1 and the rear end 23-2 are respectively A predetermined step is formed between the switch rod 23 and the insulating spacer 23-3 of the switch rod 23. The rear end 23-2 is made of a conductive material, that is, an electrically conductive member.

The insulating spacer 23-3 is non-conductive, that is, electrically insulating, and has a cylindrical shape. The insulating spacer 23-3 electrically insulates the front end 23-1 side and the rear end 23-2 of the conductive member.

More specifically, as shown in FIGS. 4 and 5, the through hole 21-3 in which the switch rod 23 is disposed is connected to a front end portion 29-1 formed on the support surface 21-1 side of the base portion 21. , a rear end portion 29-3 formed on the back surface 21-2 side of the base portion 21, and an intermediate portion 29-2 formed between the front end portion 29-1 and the rear end portion 29-3. have The front end portion 29-1, the intermediate portion 29-2, and the rear end portion 29-3 communicate with each other. The inner diameter of the front end 29-1 and the inner diameter of the rear end 29-3 are approximately equal, and both are larger than the outer diameters of the tip 23-1 and the rear end 23-2 of the switch rod 23. The inner diameter of the intermediate portion 29-2 is slightly larger than the outer diameter of the insulating spacer 23-3 of the switch rod 23, and smaller than the outer diameters of the tip 23-1 and the rear end 23-2. As a result, a predetermined step is formed between each of the front end portion 29-1 and the rear end portion 29-3 and the intermediate portion 29-2.

In the switch rod 23, an insulating spacer 23-3 is inserted into the intermediate portion 29-2 of the through hole 21-3 before a pair of terminal portions 24, which will be described later, are fixed to the back surface 21-2 side of the base portion 21. , the tip 23-1 is inserted into the front end 29-1 side of the through hole 21-3 from the support surface 21-1 side and attached to the insulating spacer 23-3, and the rear end 29-3 of the through hole 21-3 is attached to the insulating spacer 23-3. The rear end 23-2 is inserted from the rear surface 21-2 side and attached to the insulating spacer 23-3, so that it is assembled and arranged in the through hole 21-3. As a result, the tip 23-1 of the switch rod 23 is arranged closer to the support surface 21-1 than the stepped portion between the front end 29-1 and the intermediate portion 29-2, and the rear end 23-1 of the switch rod 23 2 is arranged closer to the back surface 21-2 than the stepped portion between the rear end portion 29-3 and the intermediate portion 29-2.

The elastic member 28 is housed in the through hole 22-2 and urges the switch rod 23 toward the support surface 21-1. The elastic member 28 is a member that applies elastic force in the stretching direction, and in this embodiment, a coil spring is used. As shown in FIGS. 4 and 5, the elastic member 28 passes inside the insulating spacer 23-3 of the switch rod 23 and is housed in the front end 29-1 of the through hole 21-3. The elastic member 28 has a step between the front end portion 29-1 and the intermediate portion 29-2, and a biasing receiving member 28-1 which passes the insulating spacer 23-3 inside and is overlapped with the tip end 23-1. is located between.

As a result, the elastic member 28 biases the tip 23-1 of the switch rod 23 toward the metal member 22 side, that is, the closed door 4, via the bias receiving member 28-1, and 1 protrudes from the support surface 21-1 of the base portion 21 and is biased toward a position protruding from the suction surface 22-1 of the metal member 22. That is, the tip 23-1 of the switch rod 23 protrudes from the support surface 21-1 of the base portion 21 and from the suction surface 22-1 of the metal member 22 due to the biasing force of the elastic member 28.

As shown in FIG. 2, FIG. 3, FIG. 4, and FIG. , has. Both the + terminal 24-1 and the - terminal 24-2 are made of a conductive member, and are formed into a rectangular plate shape that extends generally along the direction of the back surface 21-2. It is formed on less than half of the area of

The + terminal 24-1 is a terminal to which the + side wiring (plus side wiring) 32-1 of the detection circuit 30 is connected. The - terminal 24-2 is a terminal to which the - side wiring (minus side wiring) 32-2 of the detection circuit 30 is connected. The + terminal 24-1 and the - terminal 24-2 are fixed to the back surface 21-2 side of the base portion 21 at a distance from each other. A gap 24-3 is formed between the +terminal 24-1 and the -terminal 24-2.

The + terminal 24-1 has a through hole 25-1, as shown in FIGS. 4 and 5. The through hole 25-1 passes through the + terminal 24-1 in a direction perpendicular to the back surface 21-2. - The terminal 24-2 has a through hole 25-2, as shown in FIGS. 4 and 5. The through hole 25-2 passes through the - terminal 24-2 in a direction perpendicular to the back surface 21-2.

One through hole 21-4 of the base portion 21 and the through hole 25-1 of the + terminal 24-1 communicate with each other, as shown in FIGS. 4 and 5. One of the screws 27 is inserted into the through hole 25-1 and one of the through holes 21-4 from the + terminal 24-1 side, and is screwed into the thread groove of one of the through holes 21-4, so that the base A + terminal 24-1 is screwed to the back side 21-2 of the portion 21. Similarly, the other through hole 21-4 of the base portion 21 and the through hole 25-2 of the - terminal 24-2 communicate with each other. The other screw 27 is inserted into the through hole 25-2 and the other through hole 21-4 from the -terminal 24-2 side, and is screwed into the thread groove of the other through hole 21-4, thereby fixing the base. A negative terminal 24-2 is screwed to the back side 21-2 of the portion 21.

When the metal member 22 and the pair of terminal parts 24 are screwed to the base part 21 with the screws 26 and 27, the through hole 21-3 of the base part 21 and the through hole 22-2 of the metal member 22 are connected to each other. , the gap 24-3 between the pair of terminal portions 24 is in communication with each other. As a result, the pair of terminal parts 24 are fixed to the back surface 21-2 side of the base part 22 while being separated from each other with the through holes 21-3 and 22-2 in between.

Further, the gap 24-3 between the +terminal 24-1 and the -terminal 24-2 is formed narrower than the radial size of the rear end 23-2 of the switch rod 23. Therefore, the rear end 23-2 of the switch rod 23 cannot move to the rear side of the pair of terminal parts 24 through the gap 24-3, and the rear end 23-2 and the intermediate part 29-2 cannot move rearward than the pair of terminal parts 24 through the gap 24-3. The range of movement is limited between the step between the two terminals 2 and the pair of terminal sections 24.

The detection circuit 30 includes a power source 31, wiring 32, and an ammeter 33, as shown in FIGS. 2 and 3. In this embodiment, a battery is used as the power source 31. The wiring 32 includes a + side wiring (plus side wiring) 32-1 and a - side wiring (minus side wiring) 32-2. The + side wiring 32-1 electrically connects the + terminal 24-1 and the anode of the power source 31, and is made of, for example, a conducting wire. The - side wiring 32-2 electrically connects the - terminal 24-2 and the cathode of the power source 31, and is made of, for example, a conducting wire. The ammeter 33 is provided on the wiring 32 and measures the current flowing through the wiring 32. Although the ammeter 33 is provided on the - side wiring 32-2 in this embodiment, the present invention is not limited thereto, and may be provided on the + side wiring 32-1. Ammeter 33 transmits information on the measured current to control unit 180.

The operation of the door locking mechanism 1 according to the embodiment will be described below. In the door locking mechanism 1, when the opening/closing door 4 is in the closed state, the facing surface 11 of the magnet 10 provided on the opening/closing door 4 is attached to the suction surface 22 of the metal member 22 of the main body 20 fixed to the housing 2. The closed state is maintained by the attraction force of the attraction surface 22-1, which faces the magnet 10 and corresponds to the magnetic force of the magnet 10. At the same time, the opposing surface 11 of the magnet 10 provided on the opening/closing door 4, as shown in FIGS. By pushing the switch rod 23 toward the rear surface 21-2 of the base portion 21 against the bias of the elastic member 28, the rear end 23-2 of the switch rod 23 made of a conductive member is connected to the + terminal 24-1 and the − terminal. The positive terminal 24-1 and the negative terminal 24-2 are electrically connected by contacting the terminal 24-2. As a result, the switch rod 23 pressed toward the back surface 21-2 side of the base section 21 by the closed door 4 moves the detection circuit 30 sequentially from the power source 31 to the + side, as shown in FIG. A closed circuit is made up of the wiring 32-1, the + terminal 24-1, the rear end 23-2, the - terminal 24-2, and the - side wiring 32-2, and the ammeter 33 detects a current value higher than the threshold value. By doing so, an opening/closing detection function capable of detecting the closed state of the opening/closing door 4 is realized. When the control unit 180 detects that the opening/closing door 4 is in the closed state based on the current value detected by the ammeter 33, for example, the processing device 100 executes each operation of cutting the workpiece 200. can be made possible.

On the other hand, in the door locking mechanism 1, when the opening/closing door 4 is in the open state, the opposing surface 11 of the magnet 10 provided on the opening/closing door 4 becomes the suction surface of the metal member 22 of the main body 20 fixed to the housing 2. 22-1. Therefore, as shown in FIGS. 2 and 4, the tip 23-1 of the switch rod 23 is directed toward the back surface 21-2 of the base portion 21 by the opposing surface 11 of the magnet 10 provided on the opening/closing door 4. Since it is not pressed, it protrudes from the suction surface 22-1 of the metal member 22 due to the biasing force of the elastic member 28. The rear end 23-2 of the switch rod 23, which is made of a conductive member, is separated from the + terminal 24-1 and the - terminal 24-2, and the electricity between the + terminal 24-1 and the - terminal 24-2 is removed. disconnect. As a result, as shown in FIG. An opening/closing detection function that can detect the open state of the opening/closing door 4 by creating an electrically insulated open circuit between -1 and - terminals 24-2 so that the ammeter 33 does not detect a current value higher than a threshold value. Realize. When the control unit 180 detects that the opening/closing door 4 is in the open state based on the fact that the ammeter 33 does not detect a current equal to or higher than the threshold value, the processing device 100 controls the cutting of the workpiece 200, for example. The implementation of each operation can be restricted.

In the door locking mechanism 1 according to the embodiment having the above configuration, the magnet 10 is attracted to the metal member 22 of the main body part 20 to realize the locking function of the opening/closing door 4, and the magnet 10 is attached to the main body part. The opening/closing detection function of the opening/closing door 4 is realized by determining whether or not the detection circuit 30 is closed depending on whether or not the switch rod 23 protruding from the metal member 22 of 20 is pressed. Therefore, the door locking mechanism 1 according to the embodiment has the effect that the locking function and the opening/closing detection function can be simultaneously realized with one component.

Further, the door locking mechanism 1 according to the embodiment can stabilize the pressing state of the switch rod 23 by the locking function, so that the locking function can assist the opening/closing detection function.

Note that the present invention is not limited to the above embodiments. That is, various modifications can be made without departing from the gist of the invention.

1 Door locking mechanism 2 Housing 3 Opening 4 Opening/closing door 10 Magnet 20 Main body 21 Base 21-1 Support surface 21-2 Back 21-3 Through hole 22 Metal member 23 Switch rod 23-1 Tip 23-2 Rear End 24 Pair of terminal parts 24-1 + terminal 24-2 - terminal 28 Elastic member 30 Detection circuit 100 Processing device 180 Control unit 200 Workpiece

Claims (1)

A door locking mechanism that detects opening/closing of an opening/closing door arranged at an opening of a housing,
A magnet fixed to the end of the opening/closing door;
a main body fixed to the housing at a position facing the magnet of the opening/closing door in a closed state;
A circuit configured through the main body, and a detection circuit that detects opening/closing of the opening/closing door by opening/closing of the circuit,
The main body is
a non-conductive base portion having a support surface facing the opening/closing door in a closed state;
a metal member fixed to the support surface of the base portion and attracting the magnet of the opening/closing door to maintain the opening/closing door in a closed state;
a switch rod that is disposed in a through hole extending from the support surface of the base portion to the back surface on the opposite side, a tip of which protrudes from the support surface when biased by an elastic member, and a rear end of which is made of a conductive member;
A terminal consisting of a + terminal to which the + side wiring of the detection circuit is connected, and a - terminal to which the - side wiring of the detection circuit is connected, and is fixed to the back side of the base part with the through hole in between and spaced apart from each other. a pair of terminal parts,
A door locking mechanism in which the rear end side of the switch rod pressed by the door in the closed state contacts the pair of terminal portions to close the detection circuit to detect the closed state of the door.

Images