JPH0335519Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Field of invention) The present invention relates to a safety device for a press machine.

(Introduction of conventional technology) When moving a movable mold toward a fixed mold to process a workpiece, such as punching, drawing, caulking, swaging, etc., the workpiece is moved one by one by hand. It is often necessary to insert it between molds and remove it from the mold after processing. In such cases, safety devices are required to avoid injury to the human body, and may be regulated by law. Many safety devices have been proposed for this purpose, but they often impair work efficiency, so a press machine with a simple mechanism and sufficient safety measures without impairing work efficiency is desired. There are very few things that are completely satisfying.
JP-A-58-9799 discloses a safety device in which the operation of a plunger is controlled by a link mechanism and an associated control switch. Here, when you press the pedal, the safety feeler detects if there is a hand or other obstruction between the movable mold and the fixed mold before starting the plunger, and activates the clutch to actuate the plunger. Operation is prevented. Even if your hand is withdrawn before you return the pedal, this blocking relationship will be maintained and the plunger will not come down. This will prevent the plunger from going down unless you return the pedal completely and repeat the same operation from the beginning. No ivy presses will be performed. However, in this system, the safety device is used in conjunction with a complex linkage mechanism, which is interlocked with a control switch connected to the plunger's power source. Therefore, it is troublesome to install it on a press machine, and careful maintenance is also required after installation.

(Purpose of the invention) The object of the invention is to provide a simple and highly effective safety device that establishes the safety of a press machine in place of conventional complicated safety devices.

(Summary of the invention) According to the invention, a press machine includes a power-driven plunger that supports a movable mold, and a frame that supports a fixed mold that is vertically aligned facing the movable mold. In the safety device, the plunger includes a cylinder member, a mounting means for the movable mold disposed at a lower end of the cylinder member, and a member that penetrates the cylinder member and slides inside the cylinder member. a piston member pivotally connected to the cylinder member, a first position in which a portion thereof does not engage an end of the piston member, and a portion thereof engages an end of the piston member and slides within the cylinder member; a piston stopper configured to be rotatable between a second position for stopping the piston stopper, and a stopper pin attached to the piston stopper,
A safety device for a press machine is provided, which includes a stopper pin that collides with a collided member fixed to the press machine and rotates the piston stopper by the reaction force thereof. In this configuration,
If your hand, etc. is accidentally caught between the movable mold and the fixed mold during press work, the piston member will not be stopped by the piston stopper and will penetrate into the cylinder member. On the other hand, if no obstacle or the like is present, the piston member locks the piston stopper and is integrated with the cylinder member, allowing normal pressing work to be performed.

(Description of Preferred Embodiments) Preferred embodiments of the present invention will be described in detail below with reference to the drawings.

2 and 3 illustrate the safety device 1 of the present invention in a non-operating state. Please refer to Figure 2. Preferably, the cylindrical cylinder member 2 has an opening at its lower end, and a large diameter portion 13 extending longitudinally upward from the opening to a predetermined length with the same diameter as the opening.
, and from there upward, the large diameter portion 13
A small diameter portion 7 is formed which extends to a predetermined length and has a diameter as follows. The piston member 3 has dimensions such that its lower portion and upper portion can slidably penetrate into the large diameter portion 13 and the small diameter portion 7, respectively. Further, the large diameter portion 13 of the cylinder member 2 is provided with a slot 20 for a drop stopper 14, which will be described later, and the small diameter portion 7 is provided with slots 15 and 16 for a piston stopper 5, which will also be described later. The piston member 3 is inserted through the opening of the cylinder member 2 with a spring 9 interposed therebetween, and a drop stripper 1 is preferably screwed onto the lower part through a slot 20.
4 prevents it from falling off from the cylinder member 2. A piston stopper 5 as shown is inserted into the small diameter portion 7 of the cylinder member 2 through the slots 15 and 16, and is pivotally supported within the cylinder member by a pin 22. The piston stopper 5
can rotate about the pin 22 so that the lower end 23 locks the upper end 24 of the piston member 3. A wide slot 11 is formed in the end 28 of the piston stopper 5 that is far from the cylinder member 2 and extends vertically through the end 28.
A piston stopper actuating member 6 is inserted into the piston with a spring 10 interposed therebetween. The member 6 has a nut 2 on the top.
5 is screwed to prevent it from falling out of the slot 11, and positioned so that the lower end 30 can collide with the member 12 supported by the press. A protrusion 18 is provided in the vicinity of the slot 16 of the piston stopper 5, and the protrusion 18 and the cylinder member 2
A spring 17 is interposed in the space defined between the small diameter portion 7 and the small diameter portion 7 . The force of the spring 17 is
0 force and the spring 17 biases the piston stop 5 into the inoperative position shown in FIG.

Please refer to Figure 3. When the press operation is started, a plunger (not shown) is lowered, and the movable mold equipped with the safety device 1 of the present invention is lowered toward the fixed mold 4. At this time, if there is no obstacle between the lower side of the safety device 1, that is, the lower end surface 26 of the movable mold attached to the piston member 3, and the fixed mold 4, the cylinder member 2 and the piston The member 3 is lowered while maintaining the positional relationship shown in FIG. 2 with respect to the member 3. The piston stopper operating member 6 is configured such that the lower end surface 30 of the piston stopper operating member 6 collides with the upper surface of the member 12 immediately before the lower end surface 26 of the movable mold comes into contact with the button member 100 on the fixed mold 4. After the collision, the piston stopper actuating member 6 rotates the end 28 of the piston stopper 5 in the direction of arrow c by the force of the spring 17, overcoming the force of the spring 17. At the same time, the lower end 23 is rotated in the direction of arrow b. As a result, the lower end 23 of the piston stopper 5 is connected to the piston member 3.
The upper end is brought into a state of being locked, and upward sliding of the piston member 3 is prevented. After that, as the movable mold continues to descend, the lower end surface of the movable mold comes into contact with the button member 100 on the fixed mold,
The pressing force of the plunger is transmitted to the piston member via the piston stopper 5, and normal pressing work is completed.

Please refer to Figure 4. If a finger 40 or the like gets caught between the lower end surface 26 of the movable mold and the fixed mold 4 during press work, the piston member 3 will move relatively upward inside the cylinder member 2 due to the resistance force. slide towards. Due to this sliding, the upper end 24 of the piston member 3 is moved from the position of the lower end 23 of the piston stopper 5 while bringing a part of the upper side surface of the piston member 3 into light contact with the side surface 29 of the piston stopper 5. move upwards. As a result, the piston stopper 5 is prevented from rotating in the direction indicated by the arrow b in FIG.
Even if the piston stopper 5 is compressed as shown in the figure, the piston stopper 5 is not activated.

A spring 9 is preferably interposed in the space between the large diameter part of the cylinder member and the upper part of the piston member, and the movable mold is raised for the next press operation. After the lower end surface 26 of the piston member is separated from an obstacle 40 such as a finger, the piston member is returned to the pre-operation position shown in FIG.

Although the above description has been made based on embodiments, it should be noted that many changes may be made within the present invention.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a press machine equipped with a safety device of the present invention. FIG. 2 is an illustrative view of the safety device of the present invention in a state position before plunger operation. FIG. 3 is an exemplary diagram showing the operating state of the safety device after the plunger is operated when there is no obstacle. FIG. 4 is an exemplary diagram showing the operating state of the safety device when the plunger is operated in the presence of an obstacle. The names of the main parts in the figure are as follows. 2...
...Cylinder member, 3... Piston member, 5... Piston stopper, 6... Piston stopper operating member.

Claims (1)

[Claims for Utility Model Registration] 1. Safety in a press machine that includes a power-driven plunger that supports a movable mold, and a frame that supports a fixed mold that is vertically aligned facing the movable mold. Apparatus 1 , wherein the plunger comprises: a cylinder member 2; attachment means for the movable mold disposed at the lower end of the cylinder member 2; penetrating into the cylinder member 2; a first piston member 3 which is slidable therein; a first member pivotally connected to the cylinder member 2 and whose portion does not engage with the end of the piston member 3;
and a second position for engaging the end of the piston member 3 and stopping sliding inside the cylinder member 2. and a stopper pin 6 attached to the piston stopper 5 that collides with the collided member 12 fixed to the press machine and rotates the piston stopper 5 by the reaction force.
A safety device for press machines that consists of 2. In the press machine according to claim 1, in which the stopper pin 6 is attached to the piston stopper 5 via a spring 10 and does not interfere with the continued descent of the plunger after the stopper pin 6 collides with the collided member 12. Safety device.