JPH0236677Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a safety gate device that simplifies the opening/closing structure of a safety gate attached to an entrance/exit of a machine tool.

(Prior Art) Safety gates are provided at the entrances and exits of machining equipment in order to prevent people from getting close to the area where machining is being performed and to prevent the scattering of discharged materials during machining. Generally, as shown in FIG. 5, a cylinder device 3 is supported by a bracket 2 fixed to the main body 1 of the machine tool, and a piston rod 4 of the cylinder device 3 is connected to a knuckle 6 fixed to a safety door 5. Therefore, as the piston rod 4 of the cylinder device 3 expands and contracts, the safety door 5 opens and closes.

(Problem to be solved by the invention) When opening and closing the safety door 5 using this method, as shown in Fig. 5, the bracket 2 is attached to the device body 1 by the amount that protrudes from the device when the door is opened. It was designed to support cylinder 3. Therefore, the device becomes large and expensive due to the height of the bracket and the length of the cylinder, and the safety door must be opened and closed by operating the cylinder separately from the operation of the device. The present invention has been made in order to obtain a safety door that can be opened and closed using the movement of the drive unit of the device without relying on the drive of the cylinder as described above, and that has a simple structure.

(Means for solving the problem) As a means for solving the above problem, the present invention is a device that is attached to the opening of the main body of a machine tool so that it can be opened and closed by sliding, and that applies force in the same direction at all times. a door biased to move in the opening direction; a stopper that swings around a hinge pin to stop the door from moving in the opening direction when the door is in the open state; , a pawl that rotates in only one direction with respect to the stopper and does not rotate with respect to the stopper in the direction in which the stopper releases the lock of the door; The safety door device is connected to a drive member of the machine tool and includes a clutch arm whose other end abuts the pawl.

(Function) With this configuration, when the drive member of the machine tool operates, the clutch arm connected thereto rotates and presses the pawl pivotally connected to the stopper. The stopper also rotates with the claw,
The lock between the stopper and the door is released. As a result, the door is always moved in the opening direction by the applied force. When the door is returned to its original position, the stopper locks the door with a spring or the like, and at that time, the drive member of the machine tool also returns to its original position, but the pawl rotates freely relative to the stopper, preventing the movement of the stopper. The clutch arm also returns to its original position without affecting.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIGS. 3 and 4, the safety door 11 of the machining device 10 is attached to the frame 13 of the main body of the machining device 10 by guide rollers 12 so as to be movable up and down so as to cover the opening 10a of the machining device 10. . Further, a chain 14 is fixed to the safety door 11, and the chain 14 is supported by a front sprocket 15 and a rear sprocket 16, and a weight 17 is attached to the chain 14 below the rear sprocket 16.
are connected, the gravity of the weight 17 causes the chain 1 to move through the sprockets 15 and 16.
4 is biased to push the safety door 11 upward (in the A direction). Above the safety door 11 are the first and second
As shown in the figure, a locking device main body 18 is fixed to the main body 13 of the machine tool 10, and a stopper 20 is swingably attached to a hinge pin 19 of the locking device main body 18, which is parallel to the surface of the door 11. Stoppa 2
One end of the spring 21 is in contact with the spring 21, and the other end of the spring 21 is in contact with the spring seat 2 provided on the lock device main body 18.
1a, a force is applied to swing in the direction B in the figure, and one side of the stopper 20 is always elastically biased in the direction of the safety door 11. As a result, when the safety door is closed, the tip 20a of the stopper 20 and the upper end 11a of the safety door 11 come into contact with each other, thereby preventing the safety door 11 from moving upward (in the direction A). A pawl 22 is pivotally attached to the stopper 20 via a hinge pin 23.
fits into the groove 23a of the stopper 20, and
rotatable relative to the stopper 20 in the B'direction;
It is no longer possible to rotate in the B direction. A clutch arm 25 is pivotally attached to the lock device main body 18 by a separate hinge pin 24. clutch arm 2
5 is pulled by one end 26 to the tip 28 of the lock device main body 18 via a spring 27, and is biased in the direction C in the figure. The other end 29 of the clutch arm 25 is connected to rollers 30a, 3 by a rope 30.
It is connected to the pin P of the drive member of the machine tool via 0b. The clutch arm 25 has an end portion 26,
In addition to 29, there is a protrusion 31 which comes into contact with the pressing slope 22a provided on the claw 22. The stopper 20 has a metal fitting 32 extending upward, and the metal fitting 32 contacts a lever 33, but the lever 33 is pivoted to a small bracket 34 by a hinge pin 35, and the other end of the lever 33 is connected to a suspension 36. They are connected by a chain 37.

The machining device 10 is shown here as an example of a press-fitting machine, but the machining device (press-fitting machine) 10 has a positioning jig 38 that can slide, and the clamp cylinder 39 has a trunnion pin attached to a bracket 40 fixed to the positioning jig 38. It is attached by 41. Further, a clamper 43 is attached to the clamp arm 42, and the clamp arm 42 is rotatably attached to the positioning jig 38 by a hinge pin 44. Twist and swing, clamper 4
Perform the attachment/detachment operation in step 3. Also, clamp arm 4
A connecting pin P that connects to the rope 30 is located near the tip pin 45 of the second piston rod. Note that the press-fitting machine has a press-fitting shaft 4 in the press-fitting unit 46.
7 is attached, and the press-fitting cylinder 48 press-fits into the workpiece W which is clamped by the clamper 43.

To explain the operation, initially the safety gate 11 is the third,
As shown in Figure 4, it has moved in the A direction and is at the rising end, and is in an open state. Clamp cylinder 39
The piston rod is in a shortened state, and the connecting pin P of the clamp arm 42 with the rope 30 is in the position P'. The rope 30 is thus in a tensioned position, and the clutch arm 2 connected to the rope 30
5 is in the state shown in FIG. But safety door 1
1 is in the raised position, not in the Figure 1 position,
Also, the stopper 20 is caused by the elastic force of the spring 21.
Contact the back side of the safety door 11 and move the safety door 11 in the direction B.
is in a state where it is pressed.

An operator places the workpiece W at a predetermined position, and manually moves the safety door 11 downward (in the A' direction) using the door handle 11b to lower it to the position of the imaginary line 11'. Then, in FIG. 1, the safety door 11 comes to the position shown in the figure, so the stopper 20 projects above the safety door 11 as shown in the figure and stops the safety door 11 from moving upward. When the start button is pressed with the safety door 11 closed, the clamp cylinder 39 extends, the clamp arm 42 rotates, and the clamper 43 is pressed against the work W to clamp it. At this time, the connecting pin P of the clamp arm 42 with the rope 30 moves to the position shown in FIG.
The tension on the rope 30 is relaxed. Then, in FIG. 1, the clutch arm 25 rotates in the C direction with one end 26 pulled by the spring 27, and the protrusion 31 of the clutch arm 25 reaches a position 31' on the imaginary line. At this time, the pawl 22, which is attached to the stopper 20 by a shaft 23, is pushed from below, but since the pawl 22 freely rotates in the direction B' in the figure, the protrusion 3
It rotates only while the protrusion 31 passes, and when the protrusion 31 finishes passing, it returns to its original position under its own weight. In this state, the machine device (press-fitting machine) 10 operates, and the press-fitting cylinder 4
8 works to perform press fitting.

When the predetermined press-fitting process is completed, the clamp cylinder 39 shortens and releases the clamp on the workpiece W, but the clamp arm 42 rotates and the rope 30
The connecting pin P moves to the position P'. The rope 30 is therefore pulled and the clutch arm 25 pivots in the direction C' in FIG. 1 to reach the position shown in the figure. At this time, the protrusion 31 of the clutch arm 25
contacts the pressing inclined surface 22a of the claw 22 and presses the pressing inclined surface 23a downward. Since the pawl 22 cannot rotate relative to the stopper 20 in the direction B in the figure, the pawl 22 presses the stopper 20 and rotates it in the B' direction, thereby releasing the stopper 20 from the safety door 11. Ru. When the safety door 11 is unlocked, it is always urged to move in the direction A by the weight 17, so it rises and the safety door is opened.

If you want to raise the safety door 11 while the machine tool 10 is in operation for some reason, manually pull the hoist 36 down, the lever 32 will press the metal fitting 32 of the stopper 20, and the stopper 20 will be raised. By rotating in the direction B', the lock of the safety door 11 is released.

In addition, in this embodiment, the safety door is opened and closed in the vertical direction,
Although weights and chains are used to bias in the opening direction, the opening/closing direction is not limited to up and down. Further, in a direction other than the vertical direction, a spring device can be used to bias the safety door in the opening direction.

(Effects of the Invention) Since the present invention has the above-described configuration and operation, the safety door can be opened in conjunction with the opening/closing operation of a driving member of a machine tool, such as a clamp arm. Therefore, the conventional door opening/closing cylinder and the like are not required, which not only reduces costs but also allows the device to be made more compact.

[Brief explanation of the drawing]

Fig. 1 is a side view of the bracket with the stopper, clutch arm, etc. attached, showing the main parts of the invention, Fig. 2 is its plan view, and Fig. 3 is the machining device (press-in machine).
FIG. 4 is a front view of the entire structure, FIG. 4 is a side view thereof, and FIG. 5 is a side view of a conventional safety door opening/closing device. 10...Machining equipment (press-fit machine), 11...Safety door,
20...Stopper, 22...Claw, 25...Clutch arm, 30...Rope.

Claims (1)

[Scope of utility model registration request] A door is attached to the opening of the main body of a machine tool so that it can be opened and closed by sliding, and is always biased to move in the opening direction by applying force in the same direction. a stopper that moves to lock the door from moving in the opening direction; and a stopper that is pivoted to the stopper and rotates in only one direction with respect to the stopper, such that the stopper moves in the direction in which the door is unlocked. is characterized by comprising a pawl that does not rotate with respect to the stopper, and a clutch arm that is pivotally supported by the machine tool body, one end of which is connected to a driving member of the machine tool, and the other end of which abuts the claw. Safety gate device.