JP2001170840A - Safety device for machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safety means capable of securing the lowest limit safety in the case where a worker etc., intrudes in a critical region 7 where a table 4 for sliding carriage of a metal plate work etc., move in the case where there is the critical region 7 where the worker is in danger of hurting himself, for example, in turret punch press etc. SOLUTION: This safety device is constituted to emergency-stop movement of a table 4 at the time of collision even in the case when a worker, etc., are compelled to intrude in a critical region 7, for example, surrounded by something like a safety guard 8 by mistake by arranging a band type rubber switch 10 with elasticity for detection of contact with an obstruction on an end edge part in the moving direction of the moving table 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a safety device for a machine tool, and more particularly to a safety device for an operator in a machine tool or the like.

[0002]

2. Description of the Related Art FIG. 6 shows a schematic layout plan view of a turret punching press or the like as an example of a conventional machine tool in punching a work.

[0003] 1 is a bridge structure frame of a punching press, 2 is an NC control panel attached to the frame, 3 is a rotary turret provided with a plurality of upper dies (punches) and lower dies (dies), respectively. Is a table for slidingly feeding a sheet metal processing work (not shown) in each of the orthogonal coordinates XY (the depth direction and the left-right direction of the press) by each motor M and the ball screw mechanism. The reference numeral 6 denotes a carry base for moving the path line in the X-axis direction.

In the above arrangement, when the table 4 moves in the −Y-axis direction, if there is a danger area 7 for the worker between the table 4 and the NC control panel 2 as indicated by a broken line, For example, it is surrounded by a member such as a suitable safety guard 8 to prevent a worker from entering the danger area 7.

[0005]

However, the above configuration alone is not a complete safety measure for various workers, and is inevitably required for processing work, maintenance, inspection, and the like. When the vehicle enters the predetermined danger zone 7, there is a risk of colliding with the edge of the table 4 that has moved in the illustrated arrow -Y direction due to, for example, NC (numerical control) automatic operation.

The present invention has been made in view of the above situation, and has as its object to provide means for ensuring the minimum safety of an operator even in the above-mentioned emergency.

[0007]

Therefore, in the present invention, the above object is achieved by providing a machine tool safety device described in any of the following items (1) and (2). is there.

(1) In a machine tool for machining a workpiece, when a human body collision danger area exists between the moving table means for feeding the workpiece and the safety guard means for the worker, the safety of the table means is improved. A belt-shaped human body collision detection operation switch means having a predetermined length is provided at the front edge of the movement on the guard means side, and the movement of the table means is emergency stopped by turning on the switch. Machine tool safety device.

(2) The belt-like switch means has a continuous hollow portion inside thereof, and a pair of conductive elastic members having conductor cores on both sides thereof are always separated from each other. It has a band-shaped configuration of a predetermined length, the entire circumference of which is covered with an insulating elastic material, and when any external force is locally applied to its side surface at any point along its length in the longitudinal direction, (1) The work according to the above (1), wherein the elastic switch means is configured to cause conduction between the pair of core wires due to mutual contact due to deformation of the covering portion and elastic deformation of the pair of conductive members inside. Machine safety equipment.

[0010]

According to the construction of the present invention as described above, a contact detection switch having a band-like elasticity is provided over the entire length of the front end portion having a possibility of contact with a moving member in a predetermined dangerous area of a machine tool. Since the movement is stopped, the axial movement can be automatically stopped by a contact signal generated at any point, so that the minimum collision safety purpose can be achieved.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail based on an embodiment with reference to the drawings.

[0012]

(Structure) FIG. 1 is an equivalent view of an embodiment of the present invention when applied to a schematic arrangement example of a turret punching press as an example of the conventional machine tool shown in FIG. 6 and FIG. 6 is an enlarged side view of a main part of the table section, and the same components as those in FIG. 6 are denoted by the same reference numerals. FIG. 2 shows an essential part in an exaggerated manner.

To explain redundantly, in FIGS.
1 is a bridge frame of a punch press, 2 is an NC control panel mounted on the frame, 3 is a rotary turret having a plurality of upper dies (punches) and lower dies (dies), and 4 is a non-rotating turret. A table for moving the illustrated sheet metal work in each of the orthogonal coordinates XY (depth direction and left-right direction of the press) by each motor M and a ball screw mechanism. Reference numeral 5 denotes a path line moving in the Y-axis direction. Carry base, 6 is a carry for moving in the X-axis direction, 7 is a danger area, 8
Denotes a safety guard, and 9 denotes a work clamp.

The feature of the embodiment of the present invention is that
A rubber switch 10 as a collision detecting means having a continuous elastic band is provided over the entire length of the axial edge, and when this comes into contact with a worker or other foreign matter at any part of the entire length, The electric control circuit (not shown) described later is configured to stop the movement of the table 4 in the −Y-axis direction during the automatic operation in an emergency.

FIG. 3 is a block diagram showing the configuration of the safety device according to the present embodiment, and FIG. 4 is a structural explanatory view of an example of the rubber switch 10.

In FIG. 3, reference numeral 10 denotes a rubber switch for detecting contact on the side surface of the table 4 in the Y-axis direction, reference numeral 11 denotes a processing program for a punching press, and an emergency stop circuit 12 through an axis control unit 13 when the switch 10 is turned on. To stop the movement of the Y axis.

Reference numeral 14 denotes a ram operation control section of the turret 3.

FIG. 4 is a sectional view (a) and an external perspective view (b) of a commercially available rubber switch 10 as an example of a contact detection switch, and 10a is made of an insulating silicon rubber having elasticity. And has a hollow portion 10b. In the hollow portion 10b, a pair of conductive silicon rubbers 10c each having an inner conductor core wire 10d buried in the longitudinal direction are elastically opposed to each other in a non-contact state with each other. Then, both conductive silicon rubbers 10c come into contact with each other due to elastic deformation of the portion, and both conductive core wires 10d conduct, and (b)
The signal line 15 shown in the figure conducts, and the emergency stop circuit 12 shown in FIG. 3 is operated to function to ensure the safety of collision with an operator or foreign matter.

(Operation) FIG. 5 is a flowchart of the above operation sequence. When the punching operation of the punching press starts, the operation of the rubber switch 10 is constantly monitored in step S1, and when the operation is performed,
In step S2, the emergency stop circuit 12 is turned on, and in step S3, the operation in the −Y-axis direction is stopped to ensure safety.

(Other Embodiments) In the above embodiment, a commercially available rubber switch was used as the -Y-axis direction contact detection switch 10. However, the present invention is not limited to this. It is a matter of course that the danger area 7 can be arranged so as to be able to cope with a collision in any direction of the X and Y axes.

[0021]

As described above, according to the present invention,
In a machine tool or the like, when there is a danger area where an operator may be injured, an elastic band-shaped switch means for detecting contact with an obstacle is provided on a moving unit such as a table,
Emergency stop is configured when an obstacle, such as a worker, comes into contact with the obstacle, so that the worker, etc. accidentally or unavoidably enters the danger area surrounded by something like a safety guard. Even in such a case, the minimum security can be ensured.

[Brief description of the drawings]

FIG. 1 is a schematic layout plan view of a turret punching press of an embodiment.

FIG. 2 is an enlarged side view of a main part of the table unit of the embodiment in FIG. 1;

FIG. 3 is a block diagram illustrating a configuration of a safety device according to an embodiment.

FIG. 4 is a structural explanatory view of an example of a rubber switch, (a)
Sectional view, (b) external perspective view

FIG. 5 is an operation sequence flowchart of the embodiment.

FIG. 6 is a schematic layout plan view of a conventional turret punching press.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bridge structure of punching press 2 Frame base 3 Turret 4 Table 5 Carriage base (Y-axis movement) 6 Carriage (X-axis movement) 7 Danger area 8 Safety guard 9 Work clamp 10 Rubber switch (collision detection switch) 11 Processing program 12 Emergency stop circuit 13 Axis control unit 14 Ram operation control unit 15 Signal line M Motor

Claims (2)

[Claims] In a machine tool for processing a workpiece, when a human body collision danger area exists between a moving table means for feeding a workpiece slide and a safety guard means for an operator, the safety guard of the table means is provided. A belt-shaped human-body collision detection operation switch having a predetermined length provided at a front edge of the movement of the means, and the switch is turned on to stop the movement of the table means in an emergency. Machine safety equipment. 2. The belt-shaped switch means has a continuous hollow portion inside thereof, and a pair of conductive elastic members each having a conductor core wire on both sides thereof are always separated from each other and opposed to each other. It has a band-like configuration of a predetermined length which is disposed and its entire periphery is covered with an insulating elastic material, and in the case where a side surface is locally subjected to an external impact force at any point of its longitudinal length, 2. The machine tool according to claim 1, wherein the elastic switch means is configured to generate conduction between the pair of core wires by deformation of the covering portion and mutual contact due to elastic deformation of the pair of internal conductive members. Safety device.