JPS6037200Y2 - Variable stroke drive device for swinging crank mechanical press trimming equipment - Google Patents

Description

[Detailed description of the invention] A crank-type mechanical press trimming device that reciprocates the press ram with a constant stroke via a connecting rod.
As shown in FIG.
dc, and in order to adjust the stroke S, there is a method in which the eccentric position of the eccentric pin b on the crank a is moved in the radial direction, but in that case, the position of the bottom dead center bdc is displaced upward.

However, like a trimming press, a die f is fixed by a connecting rod C at the extreme point where the crank press d descends, and a punching die e is attached to the press ram d, which fits into the die f at the descending extreme point.
If the stroke S of the crank press d is fixed, the stroke S of the crank press d cannot be changed unnecessarily.

On the other hand, synthetic resin sheet molded products (g) to be trimmed are fed with molding heights such as H and H', and even when the molding height is low, the press ram stroke S is Leaving it constant is disadvantageous in terms of work efficiency.

The object of the present invention is to eliminate such disadvantages and to adjust the substantial top dead center of the press ram d so that the stroke can be changed as desired.

An embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 2 schematically shows an embodiment of a trimming press, in which a connecting rod 4 is connected at one end to an eccentric pin 3 of a crank which is rotationally driven by a pulse motor 1 that can change the rotation direction arbitrarily. The other end is connected to the press ram 5.

The press ram 5 is guided in vertical movement by a lifting guide 6, and a bed 8 with a trimming mechanism die 9 attached thereto is fixed below the bed 8.
Attach the cutting die 7 that fits.

In the present invention, the reversible motor 1 is used to reversibly rotate the crank 2 at an arbitrary angle below the top dead center tdc of the eccentric pin 3 of the crank 2 and at an arbitrary angle where the left and right sides are symmetrical, thereby swinging the connecting rod 4. , a command to change the rotational direction is given to the reversible motor 1, and numerical control is performed to change the rotation direction as necessary, such as arbitrary angles xx, x' to X'.

As clarified from the above explanation, the present invention does not drive the crank 2 by a pulse motor that continuously rotates in one direction, but by a reversible motor 1 that is numerically controlled and rotates reversibly. The height of the rising pole with respect to the falling pole fitted in the die 9 of 7 is made to correspond to the arbitrary heights of the trimming product (l, H'), and for this purpose, the reversible motor 1 is The stroke of the press ram 5 and the cutting die 7 is controlled by variable values corresponding to various heights of the trimmed product, for example, s'.
, s” (see Figure 3).

Therefore, it is possible to feed and trim trimming products of any height within the height range of the bottom dead center and top dead center of the crank eccentric pin, and if the stroke of the cutting die is shortened, the lowering timing of the press ram 5 can be adjusted. Since the work efficiency can be improved by increasing the number of presses, the degree of freedom in using the press can be increased.

[Brief explanation of drawings]

FIG. 1 is a schematic front view of a conventional constant stroke crank type mechanical press, FIG. 2 is a model front view of an embodiment of the present invention, and FIG. 3 is an explanatory view of the same. 1... Pulse motor, 2... Crank, 3... Eccentric pin, 4... Connecting rod, 5
...Press Ram.

Claims (1)

[Scope of utility model registration request] In a mechanical press/trimming device, a press ram is connected to an eccentric pin of a crank via a connecting rod, and a cutting die attached to the press ram is fitted into a die attached to a press bed at the lowest point of descent of the ram, numerical control is applied. A reversible motor that rotates reversibly rotates the crank so that the position of the lowering pole of the reversible rotor is set to the bottom dead center bed of the crank.
At the same time, the height of the rising point from the falling point of the cutting die is set at an arbitrary height X' to A variable stroke drive device for a swing crank type mechanical pre-trimming device, characterized in that the reversible motor is driven.