JPH06246580A - Automatic door safety device for machine tool - Google Patents

Abstract

PURPOSE:To shield the working area of a machine tool from an operating area so as to improve the environment and safety of work by disposing an opening part and a door pocket at part of a shielding plate, and disposing an automatic door, reciprocated by the driving force of an operating part, between the opening part and the door pocket. CONSTITUTION:An opening part 2 and a door pocket 12 are disposed at part of a shielding plate 1, and an automatic door 13 reciprocated by the driving force of an operating part 10 is disposed between the opening part 2 and the door pocket 12. A working area A on the machine tool side is thereby shielded from an operating area B on the work refuge side so as to improve the environment and safety of work and to facilitate going-in/out between both areas A, B. In the case of a l worker or the like coming in contact with a sensor part 19 disposed at the front end part of the automatic door 13, a clamp 27 is released to cut off transmission to the automatic door 13 from the operating part 10, In the case of the automatic door 13 receding to be enclosed in the door pocket 12, a clamp 27 is reset by a clamp reset part 44 so as to resume the automatic operation of the automatic door 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic door which shields a work area and an operation area in a machine tool, and when the automatic door is closed, the operator senses the presence of foreign matter and stops the door closing operation to stop the operator. The present invention relates to a safety device for an automatic door for machine tools designed to ensure the safety of.

[0002]

2. Description of the Related Art Conventionally, as such a safety device, as shown in FIG. 8, an arm b is provided on an automatic door a, an operating rod c is inserted through the arm b, and a proximal end of the operating rod c is inserted into a cylinder d. It was fixed on the front end of the cylinder and attached with a pressing piece e, and a spring f was wound around the operating rod c between the arm b and the cylinder d. When the operator or the like makes contact with the front end g of the automatic door a through the closing force of the automatic door a through the arm f and the arm b, the operating rod c projects forward from the arm b and the spring f contracts. I was working on the safety of the workers.

However, since the spring f also serves to transmit the closing force of the automatic door a, the amount of contraction of the spring f is limited and cannot be said to be a sufficient safety device. Even if the functioning is effective, the amount of advance / retreat of the cylinder d is larger than the amount of contraction of the spring f at the start of closing, and the automatic door a continues to be closed while the spring f is contracted. The front end g of the automatic door a continues to be pressed by a worker or the like to be closed, which is insufficient as a safety device for the automatic door a.

Further, due to the recent demand for increasing the operating rate of machine tools, the forward / backward movement speed of the automatic door a is also increased, and as a result, the elastic force of the spring f transmitting the pressing force of the cylinder d is decreased. However, it has a drawback that the contraction amount of the spring f as a safety device is reduced.

As a second safety device, as shown in FIG. 9, a transmission portion j is provided on the automatic door a via a fixed portion h and a retractable hanging rod i, and the fixed portion h is provided. A spring f is wound around the hanging rod i between the transmission part j and the transmission part j, and the transmission part j is formed in an inverted V shape to provide an inclined transmission part k.
A slide board l is installed below the transmission part j, a pressing piece e is mounted between the inclination transmission part k and the slide board l, and the pressing piece e is moved back and forth by an operating rod c connected to the cylinder d. Although the one used was also used, the advancing force of the cylinder d is performed by the contact of the pressing piece e with the inclination transmission part k, and when the worker or the like contacts the front end g of the automatic door a, the hanging bar i and the spring f contract. Then, the inclination transmitting portion k and the pressing piece e are disengaged from each other, which has a sufficient function as a safety device.

However, due to the increase in the forward / backward movement speed of the automatic door a in recent years, it is necessary to increase the inclination angle of the inclination transmitting portion k or the elastic force of the spring f. In either case, the inclination transmitting portion k and the pressing piece e are increased. The engaging force rises and the automatic door a
Even if it is possible to cope with the increase in advance / retreat speed, the release force for the safety device to function is almost the same as the engaging force, and the increase in advance / retreat speed required for the automatic door a and the safety are contradictory. Was.

[0007]

SUMMARY OF THE INVENTION The present invention improves safety by interrupting transmission of driving force from a cylinder during operation of a safety device, automates return of the safety device after operation, and automatically operates a door. It is intended to provide a safety device for an automatic door for machine tools, which transmits all of the driving force during normal opening and closing and responds to an increase in the speed of advance / retreat of the automatic door.

[0008]

SUMMARY OF THE INVENTION The present invention is based on the above-mentioned prior art, and in view of the problem that the safety is not sufficient and the advance / retreat speed of the automatic door cannot be increased, a sensor provided at the front end of the automatic door is used. A clamp with a booster mechanism is installed on the automatic door and the pressing part of the sensor part can be freely contacted with the clamp release rod of the clamp, and the clamp of the power transmission part linked to the operating part By arranging the fixed part in the clamp gap of the clamp and providing the clamp return part on the automatic door, the clamp is immediately released by the boosting mechanism in response to the contact with the sensor part of the worker etc., and the automatic door of the operating part. The drive force transmission to the motor is cut off to ensure safety, and the drive force transmission is all performed during normal opening and closing to enable the advance / retreat speed to be increased. In the manner as practiced, it is obtained by solving cents above problems.

[0009]

According to the present invention, when a worker or the like comes into contact with the sensor portion at the front end of the automatic door, the pressing portion of the sensor portion presses the clamp release rod to release the clamp by lever action and boosting action. However, the clamp fixing part, which is placed in the clamp gap and press-fitted and linked to the operating part, is released from the clamp independently, and the interlocking transmission relationship between the operating part and the automatic door is cut off, and the automatic door stops moving and is safe. Moreover, when the automatic door is stored in the door pocket, the clamp release bar pushes the clamp release rod to restore the clamp.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is an operation area A in which a machine tool (not shown) is installed and an operation area B in which a worker evacuates and operates the machine tool. It is a shield plate for shielding and isolating, and an opening portion 2 through which a worker goes in and out of both areas A and B is provided in a required portion of the shield plate 1.

Reference numerals 3 and 4 denote upper and lower frames of the shield plate 1, and an upper frame 3
Of the upper frame 5 is provided on the lower surface of the upper frame 5 and the lower frame 7 is attached to the lower frame 4 on the working area A side of the lower frame 7 while protruding. Lower rail 8 on top of
In addition, an operating portion 10 is installed below the lower frame 7 on the side of the work area A of the lower frame 4 via a fixing plate 9.

Further, a vertical crosspiece 11 is fixed to the left side of the shield plate 1 between the upper and lower frames 3 and 4, and a door bag 12 is provided on the substantially right half side, and a substantially left half side between the vertical crosspiece 11 and the door bag 12 is provided. Is formed into the above-mentioned opening 2, and the operating portion 10 is horizontally slidable between the upper and lower frames 3 and 4.
An automatic door 13 is installed which reciprocates between the opening 2 and the door pocket 12 by transmitting the driving force from the.

Reference numeral 14 denotes a fitting portion provided on the upper portion of the automatic door 13,
The fitting portion 14 has a substantially gate-shaped cross section that can be inserted into the upper rail portion 6 from below, and the inside of the gate shape of the fitting portion 14 is fitted upward.
15 and a fitting plate 17 is provided at the lower part of the automatic door 13 to form a fitting portion 17 having a substantially gate-shaped cross section, and inside the fitting portion 17, wheels 18 and 18a running on the lower rail portion 8 are provided. is doing.

Reference numeral 19 denotes a U-shaped sensor portion installed on the front side of the automatic door 13 so as to be slightly slidable.
The vertical frame 20 of 19 is freely retractable from the front end 21 of the automatic door 13,
Further, the slide board 22 is mounted on the work area A side of the automatic door 13, and the upper frame 23 of the sensor part 19 is slidable in the upper fitting part 15 of the automatic door 13 and the lower frame 24 is slidable on the slide board 22. In addition, a stopper 25 that regulates the sliding amount of the sensor unit 19 is provided at a position slightly rearward of the front end 21 of the automatic door 13.

Reference numeral 26 denotes a plate pedestal provided on the work area A side of the automatic door 13 via a contact plate 16 below the automatic door 13, and in a clamp 27 of a toggle mechanism having a plurality of links on the plate pedestal 26. The fixed plate 28 is fixed, and the front portion 29 of the fixed plate 28 is inclined downward and the rear portion
After standing, 30 is inclined rearward to form an inclined position holding portion 31 in the clamp 27.

Reference numeral 32 denotes a clamp seat fixed on a fixed plate 28. A clamp plate 34 is pivotally attached to the upper left side of the clamp seat 32 via a pivot 33, and the position of the clamp plate 34 can be adjusted at its tip end. A spindle 35 composed of a hexagonal bolt is mounted, and a clamp gap 36 having a predetermined interval is provided between the lower end of the spindle 35 and the upper surface of the fixing plate 28.

Further, a V-shaped clamp releasing rod 38 is pivotally attached to the upper right side of the clamp seat 32 via a pivot 37, and a connecting plate 39 is provided between the bent portion of the clamp releasing rod 38 and the clamp plate 34. pivot
40 and 41 are pivotally attached and swingably provided.

In the toggle joint mechanism having the above structure, three pivots for swingably connecting a plurality of links
37, 40, 41 in a straight line, that is, a V-shaped clamp release rod
When the halves of the proximal end of 38 and the connecting plate 39 overlap each other linearly, the maximum toggle force is obtained and the clamping gap 36
The holding force of the lower end of the spindle 35 is held by the clamp 27. Due to the toggle mechanism, the holding force of the spindle 35 is doubled as compared with the swinging pressure of the clamp releasing rod 38.

Reference numeral 42 is a transmission plate which is erected and fixed on the upper portion of the clamp release rod 38, and a pressing portion 43 made of a hexagonal bolt whose position is adjustable is provided at the tip of the lower frame 24 of the sensor portion 19.
Is configured to come into contact with the transmission plate 42 of the clamp 27 at the time of retreating due to the operation of the sensor unit 19, and when the pressing unit 43 pushes the transmission plate 42 backward, the clamp release rod 38 below the transmission plate 42 is centered on the pivot 37. The spindle 27 swings backward and tilts, the spindle 35 swings upward, and the clamp 27 is released by retracting upward from the position where the spindle 35 is pressed against the clamp gap 36.
The 38 and the transmission plate 42 are held in contact with the inclined position holding portion 31 of the fixed plate 28.

Reference numeral 44 is a clamp return portion installed in the rear portion of the door pocket 12, and a return pressing portion 46 formed of a hexagonal bolt whose position is adjustable is provided on a mounting substrate 45 of the clamp return portion 44. Is abuttable against the transmission plate 42 of the clamp release bar 38 of the clamp 27 from the rear side, and is the door pocket 12 of the automatic door 13.
The return pressing portion 46 presses the clamp releasing rod 38 during storage in the container and restores the upright state to restore the clamp state.

Reference numeral 47 is a cylinder of the operating portion 10. The cylinder 47 is fixed to a fixing plate 9 provided on the lower frame 4 of the shield plate 1, and a slide board 48 is horizontally installed on the lower front side of the cylinder 47 to form a cylinder. Moving part 50 fixed to the tip of rod 49 of 47
Is installed slidably on the slide board 48, and the moving unit 50
The clamp fixing portion 52 is formed to extend through the L-shaped power transmission portion 51, and the clamp fixing portion 52 is arranged in the clamp gap 36 in the clamp 27 of the toggle mechanism.

Further, in the above-mentioned structure, the link mechanism having the toggle mechanism as the clamp 27 has been described. However, the clamp mechanism 27 may be constituted by the following cam mechanism, and the toggle mechanism itself by the link mechanism is the same. Not limited to the one in the embodiment, a usual toggle joint mechanism can be adopted, and it is a usage method that utilizes the fact that the pressing force rapidly increases as multiple links overlap or become linear, which is the usual usage method. On the other hand, in the link mechanism having the toggle mechanism of the present application, when the links are overlapped with each other and become linear, the link mechanism is applied so as to obtain the maximum pressure to obtain the boosting force.

As the clamp 27 of the cam mechanism, a pair of parallel mounting plates 53, 53a are formed by extending from the clamp seat 32,
A cam plate 54 is pivotally held by a pivot 55 between the mounting plates 53, 53a,
The pivot 55 may be eccentrically attached to the circular cam plate 54, or the cam plate 54 may be deformed (not shown), and the clamp release rod 38 is fixed to the upper portion of the cam plate 54.

In the clamp 27 of the cam mechanism described above, when the swingable clamp release bar 38 is in the vertical state, the lower surface of the cam plate 54 has a pressing force against the clamp gap 36, and the action point distance from the pivot 55 varies. It is designed to gain a boost due to the difference.

An auxiliary plate 56 is provided on the front surface of the inclined position holding portion 31 so that the clamp released rod 38 can come into contact with the inclined position holding portion 31 of the fixed plate 28 when the clamp releasing rod 38 is inclined. .

Next, the operation of the safety device for an automatic door for machine tools according to the present invention will be described.
Then, the work is set on the machine tool, and the work is moved to the operation area B through the opening 2 of the shield plate 1, the automatic door 13 is closed, and then the two-hand start switch is pressed to operate the machine tool.

When there is a danger that a worker, a foreign object, or the like is present in the opening 2 when the automatic door 13 is closed, the automatic door 13
When a worker or the like comes into contact with the sensor portion 19 of the front end portion 21 of the sensor portion 19, the sensor portion 19 immediately retracts and retracts with respect to the automatic door 13, and the pressing portion 43 of the lower frame 24 of the sensor portion 19 also retracts slightly. .

The retracted pressing portion 43 is a clamp of a toggle mechanism.
The transmission plate 42 above the clamp release rod 38 of 27 is pushed rearward, the clamp plate 34 of the clamp 27 and the spindle 35 are oscillated upward, and the fixing force is released, and the clamp plate 36 and the fixing plate 28 are arranged. The clamp fixing part 52, which is connected to the operating part 10 crimped and fixed by the spindle 35, is released, and the drive transmission between the cylinder 47 of the operating part 10 and the automatic door 13 is disconnected and released, and the automatic door 13 is in the contact position. At the same time, the operation of the operating unit 10 by the cylinder 47 is continued, and the clamp fixing unit 52 independently advances to the front of the clamp 27.

Further, when the driving force transmission is released, the clamp releasing rod 38 of the clamp 27 is swung rearward, and the inclined position holding portion is held.
When the automatic door 13 is retracted by the reverse operation of the operating part 10, the clamp fixing part 52 of the operating part 10 is initially retracted independently, and then the clamp fixing part 52 is moved to the front end of the clamp seat 32 of the clamp 27. The automatic door (13) is retracted by contacting the edge and stored in the door pocket (12).

Immediately before the end of storage, the return pressing portion 46 of the clamp return portion 44 provided on the door pocket 12 has the clamp release rod 38.
Press the upper transmission plate 42 from the rear to
Moves upright, the clamp plate 34 and the spindle 35 also swing down, abuts against the clamp seat 32 and retracts, and the fixed plate 28 moves.
The clamp fixing portion 52 of the operating portion 10 existing above is fixed by pressure contact with the fixing plate 28 and the spindle 35, and the fixing by the clamp 27 of the toggle mechanism and the connection between the operating portion 10 and the automatic door 13 are restored.

Further, as a function of the safety device for the automatic door for machine tools, which is constituted by the clamp 27 of the cam mechanism instead of the clamp 27 of the toggle mechanism, as in the clamp 27 of the toggle mechanism, the pressing portion 43 or the return pressing portion 46 is used. Clamp 27 Clamp release rod 38
Alternatively, by pressing the transmission plate 42, the fixing or releasing of the clamp 27 operates, and when the fixing operation is performed, the clamp releasing rod 38 stands upright and the lower end of the cam plate 54 directly below the pivot 55 fixes the clamp fixing portion 52 by pressing.

The clamp 27 of the toggle mechanism and the cam mechanism is used.
Explaining the operation as a boosting mechanism in, the common point of both the toggle mechanism and the cam mechanism is that the clamp release bar 38 or the transmission plate on which the pressing portion 43 or the return pressing portion 46 acts.
If 42 is the input side and the pressing action part 57 consisting of the spindle 35 or the cam plate 54 that comes into contact with and comes into pressure contact with the clamp fixing part 52 from the upper side is the output side, a boosting action as a lever action depending on the distance between them and the fulcrum. In the toggle mechanism, the maximum pressing force is generated when the pivots 37, 40 and 41 are aligned and the link portions overlap each other.

In the fixing and releasing actions of the toggle mechanism and the cam mechanism having these boosting actions, both mechanisms at the time of fixing correspond to a speculation point and a dead point, and when the clamp 27 is released, a leverage force is applied. By the action, it can be released with a small contact force on the sensor part 19, and when the clamp 27 is fixed, the spindle
If the clamp fixing portion 52 is pressed by the 35 or the cam plate 54,
Due to the reaction, the same pressure acts on the spindle 35 or the cam plate 54, and the clamp fixing portion 52 is pressed and held in the clamp gap 36 against the movement of the clamp fixing portion 52 by the operating portion 10 and has the above-described reaction. Therefore, the clamp 27 and the automatic door 13 slide in conjunction with the movement of the clamp fixing portion 52.

In the toggle mechanism clamp 27,
Since the linear state of the pivots 37, 40 and 41 is the dead point and the dead point due to the reaction to the spindle 35, the fixing state by the clamp 27 can be completely achieved.

[0035]

In summary, according to the present invention, the opening 2 and the door pocket 12 are provided in a part of the shield plate 1, and the automatic door 13 which reciprocates by the driving force of the operating portion 10 is provided between the opening 2 and the door pocket 12. Therefore, by shielding the work area A on the machine tool side and the operation area B on the worker retreat side, it is possible to prevent personal injury during machining and improve the work environment. It is possible to easily move in and out between the operation areas B.

Also, a retractable sensor section 19 is attached to the front end 21 of the automatic door 13, a pressing section 43 is attached to the rear end of the lower frame 24 of the sensor section 19, and a clamp 27 is attached to the automatic door 13. The clamp 27 is provided with a clamp release rod 38 on the input side and a pressing action portion 57 on the output side, and has a booster mechanism between the clamp release rod 38 and the pressing action portion 57. The clamp fixing portion 52 that is connected to the operating portion 10 is arranged in the clamp gap 36 formed between the plate 28 and the pressing portion 57 so that the pressing portion 57 presses and holds the clamp fixing portion 52 when the clamp 27 is operated. The clamp release rod 38
Since the pressing portion 43 is abuttable, the clamp 27 is released when the operator or the like comes into contact with the sensor portion 19 of the front end portion 21 of the automatic door 13 in response to the depression of the sensor portion 19, and the operation is performed. The driving force of the part 10 can be stopped without being transmitted to the automatic door 13 to ensure safety. Also, since the clamp 27 has a booster mechanism, the force required to release the clamp 27 should be small. Therefore, the safety device can be immediately actuated when a worker or the like comes into contact with the sensor unit 19.

Further, since the clamp return portion 44 is installed on the door pocket 12 and the clamp release bar 38 is abuttable on the return pressing portion 46 of the clamp return portion 44, the automatic door 13 is retracted and the interior of the door pocket 12 is retracted. When it is stored in, the clamp 27 is restored by the action of the clamp return part 44, and the automatic operation of the automatic door 13 can be restarted. Therefore, in the safety device of the present invention, the driving load on the automatic door 13 is reduced in the case of danger. It does not exist at all, and all the driving force of the operating unit 10 can be transmitted at the time of reciprocating movement, and it is possible to safely cope with the increase in reciprocating speed of the automatic door 13.

Further, since the clamp 27 having the boosting mechanism has the toggle mechanism having a plurality of links, the toggle joint mechanism including the toggle link mechanism of the embodiment is generally used. The joint mechanism can be easily adopted for the clamp 27, and the maximum pressing force at the time of overlapping of links can be easily achieved by applying its boosting action, that is, by expanding the movement amount of the link to a thought point, etc. You can get it.

Further, the clamp seat 32 is fixed on the fixing plate 28, and the pivots 33, 37 are provided on both sides of the upper part of the clamp seat 32.
A clamp plate 34 and a clamp release rod 38 are pivotally attached to each other via a pin, a spindle 35 having a pressing action portion 57 is attached to the tip of the clamp plate 34, and the clamp release rod 38 is bent and the bent portion and the clamp plate are attached. Since the pivots 40 and 41 are provided at the base ends of the 34 and the connecting plate 39 is pivotally attached, the linear state of the pivots 37, 40 and 41, that is, the overlapping of the links in the normal toggle joint mechanism is also a thought point and a dead point. Therefore, the link mechanism can maintain its state even when stress is generated from the clamp fixing portion 52, and can maintain a completely crimped state.

Further, the clamp 27 having a boosting mechanism is made of a cam mechanism, or mounting plates 53, 53 are mounted on the fixed plate 28.
The clamp seat 32 having a is fixed, and the eccentric cam plate 54 is pivotally attached to the mounting plates 53, 53a through the pivot 55, and the clamp release rod 38 and the pressing action portion 57 are provided on the cam plate 54. The adoption of the boosting mechanism by the cam of the embodiment that is usually used, the maximum pressing force can be easily obtained by application, the cam mechanism has few moving parts and the crimped state can be easily maintained. The practical effect is enormous.

[Brief description of drawings]

FIG. 1 is a rear view from a work area side of a shielding plate provided with an automatic door equipped with a safety device according to the present invention.

FIG. 2 is a side sectional view of FIG.

FIG. 3 is a rear view of the automatic door.

FIG. 4 is a rear view of the clamp of the toggle mechanism.

FIG. 5 is a rear view of the clamp of the cam mechanism.

FIG. 6 is a side view of FIG.

FIG. 7 is an enlarged rear view of the cam plate.

FIG. 8 is a rear view showing a conventional example.

FIG. 9 is a rear view showing another conventional example.

[Explanation of symbols]

 1 Shield 2 Opening 10 Actuator 12 Door pocket 13 Automatic door 19 Sensor 21 Front end 24 Lower frame 27 Clamp 28 Fixing plate 32 Clamp seat 33 Axis 34 Clamp plate 35 Spindle 36 Clamp gap 37 Axis 38 Clamp release rod 39 Connecting plate 40 Axis 41 Axis 43 Pressing part 44 Clamp return part 46 Return pressing part 52 Clamp fixing part 53, 53a Mounting plate 54 Cam plate 55 Axis 57 Pressing part

Claims (5)

[Claims] 1. A sensor which is provided with an opening and a door pocket in a part of a shielding plate, and an automatic door which reciprocates by a driving force of an operating portion between the opening and the door pocket, and which can be retracted at a front end portion of the automatic door. Mounting part, the pressing part is mounted on the rear end of the lower frame of the sensor part, and the fixing plate equipped with the clamp is installed on the automatic door. The clamp has the clamp release rod on the input side and the pressing action part on the output side. Each of them has a booster mechanism between the clamp release rod and the pressing action part, and the clamp fixing part that connects with the operating part is arranged in the clamp gap formed between the fixing plate and the pressing operation part to operate the clamp. At this time, the pressing action part presses and holds the clamp fixing part, and the pressing part can be brought into contact with the clamp release bar, and the clamp return part is installed on the door pocket and the return pressure of the clamp return part is set. Clamp release rod on the part It is a safety device for automatic doors for machine tools, characterized by being able to abut freely. 2. The safety device for an automatic door for a machine tool according to claim 1, wherein the clamp having the boosting mechanism is a toggle mechanism having a plurality of links. 3. A spindle having a clamp plate fixed on a fixing plate, and a clamp plate and a clamp release rod are pivotally mounted on both upper sides of the clamp seat via pivots, and a spindle having a pressing action portion at the tip of the clamp plate. 3. The safety device for an automatic door for machine tools according to claim 2, wherein the clamp releasing rod is bent, and the connecting plate is pivotally mounted by providing pivots at the bent portion and the base end of the clamp plate. . 4. The safety device for an automatic door for a machine tool according to claim 1, wherein the clamp having the boosting mechanism is a cam mechanism. 5. A clamp seat having a mounting plate is fixed on a fixed plate, and an eccentric cam plate is pivotally attached to the mounting plate via a pivot, and the cam plate is provided with a clamp releasing rod and a pressing action portion. The safety device for an automatic door for machine tools according to claim 4, wherein.