JP2002224890A - Press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric press without the fear of damages by adding a simple mechanism, and capable of easily and arbitrarily varying the pressure. SOLUTION: A manual handle 6 is provided, a slide mechanism 4 is mutually operated, a pressing part is lowered so as to almost bring into contact with the work 10, and a switch 8 of a motor is turned on. The final pressure can be varied by providing a lever mechanism to cancel the reaction of a spring installed on the lever mechanism for generating the reaction by the pressure generated by an eccentric cam.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press machine widely used for pressure molding of products made of metal and other materials.

2. Description of the Related Art In a conventional electric press machine, a slide mechanism and a pressurizing mechanism attached to the slide mechanism are driven by an electric motor during the entire operation. Further, in the conventional electric motor-driven press machine, the pressing force is uniquely determined by the output of the electric motor, the reduction ratio of the reduction gear, the stroke of the slide mechanism, and the like, and it is difficult to change the pressing force.

[Problem to be Solved] In a conventional electric press machine, a slide mechanism and a press mechanism are driven by an electric motor throughout the entire operation. There was a danger of being injured if fingers etc. were pinched. In addition, in the conventional electric press machine,
Since it was difficult to change the pressing force arbitrarily and easily, it often occurred that the workpiece could not be machined in an optimum state.

[Means for Solving the Problems] In the present invention, a new manual handle is additionally provided, and at the time of work, the slide mechanism and the pressing mechanism are brought into contact with the workpiece in advance by the manual handle. Then, the electric motor was driven by operating the switch provided at that position, and the pressurizing operation was performed.
Therefore, if a finger or the like is pinched by the pressing mechanism,
Since the switch does not operate, no injury occurs.
Further, in the present invention, a lever mechanism is newly provided, and the pressure generated by the eccentric cam is transmitted to the pressing mechanism through the lever mechanism. Then, a spring acting in the opposite direction to the pressing force generated by the eccentric cam mechanism is arranged at one end of the lever mechanism, thereby canceling the pressing force to control the generated pressing force of the entire processing machine. As the spring, an object having a variable tension mechanism and an object having a fixed tension that can be replaced can be used.

[Operation] In the present invention, a manual handle is provided in a conventional electric press machine, and at the time of work, the manual handle is used to move a pressing mechanism to a position in contact with a workpiece. Since the switch of the electric motor is operated by the manual handle, even if a finger is accidentally pinched by the pressurizing mechanism, no injury is caused. Further, according to the present invention, the pressing force generated by the eccentric cam mechanism is transmitted to the pressing mechanism via the lever mechanism, and a spring acting in the opposite direction to the pressing force is arranged at one end of the lever mechanism to cancel the pressing force. Was. Therefore, by adjusting the tension of the spring of the lever mechanism, the final pressing force of the processing machine can be arbitrarily and easily changed.

Next, an embodiment of a press machine according to the present invention will be described with reference to the drawings. [Fig. 1]
1 is a configuration diagram of a press machine according to the present invention as viewed from the front. In the drawing, reference numeral 1 denotes a rotation shaft of a reduction gear (not shown). A motor (not shown) is connected behind the reduction gear, and the reduction gear is driven by the motor. Reference numeral 2 denotes an eccentric cam attached to the rotation shaft of the reduction gear. The eccentric cam 2 changes the rotating operation to the up and down operation by sliding on the upper part of the slide mechanism indicated by reference numeral 4. Slide mechanism 4
Performs up and down operations supported by sliding shafts 3 and 3 'provided at both ends, and transmits a pressing force to an upper part 5 of a pressing mechanism composed of two parts indicated by reference numerals 5 and 5'. . Reference numeral 6 denotes a manual handle. The handwheel 6 rotates about an axis 9. The manual handle 6 is in contact with the upper portion of the slide mechanism 4 via a roller 7 provided on the handle, and slides on the slide mechanism 4. When the right end of the manual handle 6 is held by hand and rotated clockwise, the slide mechanism 4 is pushed down and the upper part 5 of the pressurizing mechanism is denoted by reference numeral 10.
Reaches the position in contact with the workpiece 10 indicated by. At the same position when the upper part 5 of the pressurizing mechanism contacts the object 10 to be lowered,
A switch indicated by reference numeral 8 is provided, and the movable portion is pushed by the manual handle 6 to shift to an ON state, and power is supplied to an electric motor (not shown) to perform a pressurizing operation. If a finger or the like is accidentally pinched between the pressurizing mechanisms 5 and 5 ', the lowering of the slide mechanism stops and the manual handle 6
Cannot be rotated, the switch 8 is not pushed, and the pressurizing operation does not proceed, so there is no risk of injury. Next, FIG. 2 shows a mechanism diagram of a press machine having a pressing force adjusting function by a lever mechanism according to the present invention. In the figure, reference numeral 11 denotes a newly added lever, and reference numeral 12 denotes a reaction force generating spring. The lever 11 is in contact with the slide mechanism at the left end in the figure, and is disposed so as to sandwich the reaction force generating spring 12 between the lever 11 and the slide mechanism at the right end. In addition, lever 11
Is in contact with the eccentric cam 2 at an appropriate ratio at the upper portion. The force generated by the eccentric cam 2 passes through the lever 11,
It is transmitted to the upper part 5 of the pressurizing section via the contact section 13 with the slide mechanism. In this case, at the contact point between the eccentric cam 2 and the lever 11, a downward force by the eccentric cam 2 and an upward force by the spring 12 act. Therefore, the spring 12
By adjusting the tension of, the pressing force can be arbitrarily changed. It goes without saying that the force transmitted by the spring 12 depends on the ratio of the distance from the fulcrum between the point of occurrence and the point of action according to the principle of leverage. Although the force of the spring 12 can be easily changed by providing an adjusting screw or the like, the pressing force can be adjusted by replacing the fixed tension spring. Further, needless to say, it can be changed by changing the contact position with the slide mechanism.

[Effects] As described above in detail, according to the present invention, by adding a simple mechanism, it is possible to eliminate the occurrence of injuries such as fingers of an operator by a press working machine. Was. Further, according to the present invention, it is possible to easily change the pressing force of the press working machine, and it is possible to perform a working operation under an optimum condition for a workpiece.

[0007]

[Brief description of the drawings]

FIG. 1 shows a mechanical diagram of a press machine provided with a manual handle according to the present invention.

FIG. 2 shows a mechanism diagram of a press machine provided with a lever mechanism according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotating shaft of reduction gear 2 Eccentric cam 3, 3 'Sliding shaft of slide mechanism 4 Slide mechanism 5 Upper part of pressure mechanism 5' Lower part of pressure mechanism 6 Manual handle 7 Roller of manual handle 8 Switch 9 Manual handle Rotation axis of 10 Workpiece 11 Lever 12 Spring 13 Contact part of lever slide mechanism

Claims (2)

[Claims] 1. A press working machine comprising an electric motor, a reduction gear, an eccentric cam, a slide mechanism, a pressurizing mechanism and the like, wherein a manual handle is provided, and prior to the working operation, the manual handle turns the slide mechanism into a pressurizing mechanism. A press working machine characterized in that it is moved to the extent that it contacts the workpiece, and a switch is provided so that the pressurizing mechanism operates simultaneously with contact with the workpiece, thereby driving a motor to perform a working operation. 2. A press machine comprising an electric motor, a reduction gear, an eccentric cam, a slide mechanism, a press mechanism, and the like, wherein one end thereof has a variable tension mechanism provided to act in a direction opposite to the press direction. The press machine according to claim 1, wherein the pressing force is transmitted via a lever mechanism having a replaceable fixed tension spring.