JPS6128440B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in press machines.

Various types of press machines are known.

For example, a toggle press, as is well known, consists of toggle links 1 and 2 and a connection 3, and by driving the connection 3 in the direction of the arrow, the toggle links 1 and 2 are moved, and the ram 4 is moved up and down.

This toggle press has the advantage of having a strong compressive force, but it has the disadvantage that it cannot be operated at high speed and that it is not easy to manufacture parts such as links because precision in the shape and length of the links is required. .

Another example of a press machine is an eccentric press. It has a mechanism as shown in FIG. 2, and consists of an eccentric shaft 7 fixed to a drive shaft 6, and a connection 8 connecting the eccentric shaft 7 and a ram 9. The eccentric movement of the eccentric shaft 7 caused by rotating the eccentric shaft 6 is converted into the vertical movement of the ram 9 via the connection 8.
This eccentric press also has drawbacks such as not being able to operate at high speeds and requiring the connections to be manufactured with high precision.

The present invention provides another eccentric shaft that is further eccentric to the eccentric shaft, and converts the eccentric movement of one eccentric shaft due to the rotation of the drive shaft into the vertical movement of the other eccentric shaft, thereby moving the ram up and down. The present invention provides a press machine that can operate at high speeds and generate a strong compressive force.

The press machine of the present invention will be explained below with reference to the drawings. In FIG. 3, 11 is a drive shaft rotated by a drive source (not shown), and 12 is a drive shaft 11.
The first eccentric shaft 13 is eccentrically fixed to the first eccentric shaft 12 and is fixed to the eccentric shaft 12.
14 is an eccentric shaft guide that is arranged to be movable only in the vertical direction and has a second eccentric shaft inside thereof. 13 is arranged so that it can be rotated. 15 is a ram arranged to be able to move up and down along a ram guide 16; 17 is a connection screw connecting the eccentric shaft guide 14 and the ram 15; and 18 is a frame.

In the press machine of the present invention having the above-described structure, when the drive shaft 11 is rotated by the drive source, the first eccentric shaft 12 fixed thereto is also rotated. This eccentric movement of the first eccentric shaft 12 causes the second
The eccentric shaft 13 also moves eccentrically. However, since the eccentric shaft guide 14 is configured to move only in the vertical direction and not in the lateral direction, the second eccentric shaft 1
3 cannot move laterally either. Therefore, the eccentric shaft guide 14 moves up and down along the frame 18.
Along with this, the ram 15 moves up and down along the ram guide 16 via the connection screw 17.

Among the operations of the press machine of the present invention described above, the movement of the second eccentric shaft 13 due to the rotation of the drive shaft 11 will be explained. FIG. 4 is a diagram sequentially showing the movement of the second eccentric shaft 13. When the drive shaft 11 is rotated from state A in FIG. 4 and the first eccentric shaft 12 is rotated in the direction of the arrow, the second eccentric shaft 13 also tries to rotate in the same direction. However, as mentioned above, the second
Since the horizontal movement of the eccentric shaft 13 is restricted, the second eccentric shaft 13 descends while being shifted from the first eccentric shaft 12, changing as shown in FIG. 4B. During this time, the second eccentric shaft 12 rotates through 90 degrees, but the second eccentric shaft 13 moves by an angle α such that, for example, point a moves to a'. Furthermore, the first eccentric shaft 12 is moved in the direction of the arrow.
When rotated through 90 degrees as shown in FIG. 4D, the second eccentric shaft 13 rotates in the opposite direction and point a' returns to point a. When the first eccentric shaft 12 further rotates 90 degrees, point a
moves to the right by α and rises. Then rotate another 90 degrees and return to Figure 4A. As described above, when the first eccentric shaft 12 rotates once, the second eccentric shaft 13 reciprocates by the angle 2a and also moves up and down.

During the above movement of the eccentric shaft, when the state shown in FIG. 4D is reached, that is, when the ram descends the most, the operation is exactly the same as that of the toggle link of a toggle press. FIG. 4C is a diagram showing the state before FIG. 4D. In this figure, the eccentric shaft 12 moves in the direction of the arrow x. On the other hand, the second eccentric shaft 13 moves in the direction of the arrow y.
If we consider the straight line X and the straight line Y, they correspond to the two toggle links of a toggle press. Since the straight line X moves in the direction of the arrow x and the straight line Y moves in the direction of the arrow y, this is the same as the movement of the toggle link in a toggle press. Therefore, when the second eccentric shaft 13 and therefore the ram 15 descend the most, an extremely large compressive force is generated. Moreover, since all motions are rotational, high-speed motion is possible.

Further, as shown in FIG. 3, by using an O-ring 19 on the sliding part of the eccentric shaft guide 14 with the frame 18 to maintain airtightness in this part and filling the frame 18 with oil, the first eccentric shaft can be moved. Since oil is constantly supplied to the sliding parts such as the contact parts between 12 and the second eccentric shaft 13 and between the second eccentric shaft 13 and the eccentric shaft guide 14, the movement is extremely smooth.

As explained above, the press machine of the present invention can realize extremely strong compressive force and can operate at high speed. Moreover, since it is sufficient to combine eccentric plates without using links or the like, manufacturing is extremely simple and there is also the advantage that the number of parts can be reduced. Furthermore, by sealing oil in the frame, oil is always automatically supplied to the contact parts, ensuring smooth movement at all times.

[Brief explanation of the drawing]

Figures 1 and 2 are diagrams showing the vertical movement mechanism of a conventional press machine, Figure 3 is a diagram showing the configuration of the press machine of the present invention, and Figure 4 is a diagram showing the first and second eccentricity in the press machine of the present invention. It is a figure showing movement of an axis. 11... Drive shaft, 12... First eccentric shaft, 13
... second eccentric shaft, 15 ... ram, 18 ... frame.

Claims (1)

[Claims] 1 A first eccentric shaft that is eccentrically fixed to the drive shaft, a second eccentric shaft that is arranged eccentrically around the first eccentric shaft, and an inner surface that is in contact with the outer peripheral surface of the second eccentric shaft. and an eccentric shaft guide that enables only reciprocating motion in a straight line so that the second eccentric shaft can rotate with the second eccentric shaft in contact with the inner surface. A press machine in which the eccentric shaft guide is moved up and down by the rotation of the second eccentric shaft based on the movement of the ram, and the ram is moved up and down.