JPH0224559Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a crank press, and more specifically to a crank press equipped with a mechanism for vertically guiding a slide by a guide means provided in an intermediate frame provided in a lower frame. be.

Conventionally, crank presses have included a mechanism in the upper frame that guides the slide.

In this type of crank press, the opening bends vertically apart due to the pressure reaction force during press processing, so the parallelism between the bottom surface of the slide and the top surface of the bolster is lost, resulting in products with inferior precision. There were inconveniences such as not being able to do so or damage to the mold.

The present invention has been made for the purpose of solving the above-mentioned disadvantages of the conventional crank press, and preferred embodiments thereof will be described in detail below based on the drawings.

Figures 1 and 2 show a crank press 1 as a reference example, in which a lower frame 5 with a bolster 3 on the upper surface, a column part 7 on the 1 side (right side in Figure 2), and an upper frame 9 are firmly attached. It is structured in such a way that it is connected to the

A flywheel 11 is provided on the outer side of the upper frame 9 (on the right side in FIG. 1), and is continuously driven to rotate by a drive motor 13 as shown in FIG. The generated rotational energy is transmitted to the eccentric portion 21 of the main shaft 19 via the clutch brake 15 and the gear 17.

In the reference example devices shown in FIGS. 1, 2, and 3, connecting rods 23 of the same size and shape surround two eccentric portions 21. The vicinity of the lower end is connected to an intermediate rod 27 by a shaft member 25.

The intermediate rod 27 is connected to the slide 29 by a second shaft member 31 at the upper center of the slide 29 in the longitudinal direction (horizontal direction in FIG. 2).

The shaft member 25 described above is the connecting rod 2.
A guide member 35 provided on the upper frame 9 and the above-mentioned wheels 33 constitute a guide means to guide the intermediate rod 27 only in the vertical direction. It is regulated.

As is most clearly seen in FIG. 3, a bracket 37 is provided above the slide 29 and is connected to the intermediate rod 27 by the aforementioned second shaft member 31, and the bracket 37 is connected to the intermediate rod 27 by a rib member 39. It has been reinforced.

Also, guide posts 41 are located at the four corners of the slide 29.
is planted facing upward.

An independent frame 43 similar to the column section 7 described above is fixed to the rear of the lower frame 5 (right side in FIG. 2) by an appropriate means, and the upper front side of the independent frame 43 (the right side in FIG. A rectangular frame 45 is provided on the top left side).

A hollow columnar guide tube 47 is provided at the four inner corners of the frame 45, and a guide sleeve 49 provided with an oil groove is installed inside the guide tube 47.

The guide post 41 described above is fitted into the guide sleeve 49, and the slide 29 is moved up and down by these guide means while keeping its lower surface always parallel to the upper surface of the bolster 3.

Next, an embodiment of the present invention will be explained with reference to FIG.

The embodiment shown in FIG.
A connecting rod 23 is attached to the eccentric portion 21 at several locations, and an intermediate rod 27 is connected via a shaft member 25.

In the reference example described above, the roller 33 provided on the outside of the shaft member 25 and the guide member 35 provided on the upper frame 9
In this embodiment, the intermediate rod 27 is made into a cylindrical body, and the cylindrical part is suspended from the upper frame 9. It is configured to be guided by a tube 51.

Therefore, below the intermediate rod 27 forming a cylindrical body, there is provided a screw rod 5 having a ball joint 53 on its head.
5 are screwed together, and the ball joint receiving part 57 provided on the upper surface of the slide 29 and the ball joint 5 are screwed together.
The slide 29 is pressed down at the surface contact portion between the slide 29 and the slide 29.

In addition, on the horizontal outer periphery of the ball joint 53,
For example, a worm wheel 59 having a polygonal center hole such as a hexagonal hole is loosely fitted therein, and a worm gear 61 that engages with the worm wheel 59 is provided in the ball joint receiving portion 57 .

In the reference example, four guide posts 41 were provided on the slide 29, but in this example, several air balances 63 are further provided.

Thus, the device according to this embodiment has the worm gear 6
By rotating the crank press 1, the shaft height of the crank press 1 can be easily adjusted.

In short, in the crank press of this embodiment, even if the free end (open end) of the upper frame opens in the direction away from the bolster due to the pressure reaction force during press working, the slide does not move toward the intermediate rod from the second shaft member or The ball joint allows you to bend easily.

Furthermore, the multiple guide means for guiding the slide up and down are provided at the corners of the slide, and the slide is guided by a frame independently provided below the upper frame without receiving any pressure reaction force. Even when an unbalanced load is applied to the slide, the inclination of the slide is effectively suppressed, and the drawback of the conventional crank press in which the lower surface of the slide and the upper surface of the bolster are not parallel to each other can be solved.

In addition, since the slide is held in such a manner that it is always lifted by the balancer, the minute clearances that exist in each connecting portion are always pushed upward, allowing for higher precision machining.

As can be understood from the above description of the embodiments, in short, the present invention has an eccentric part 21 provided on the upper frame 9 provided on the upper part of the column part 7 which is integrated with the lower frame 5 having the bolster 3 on the upper surface. Main shaft 1
9 is rotatably provided, a slide 29 is vertically movably supported on an independent frame 43 provided on the lower frame 5 separately from the column section 7, and is fitted into the eccentric section 21 of the main shaft 19. The distal end of the rod 23 is pivotally connected to one end, and the other end of the intermediate rod is pivotally connected to the slide 29 to form a crank press. guide post 41
The frame body 4 provided on the upper part of the independent frame 43
The frame body 45 is provided so as to be guided in a vertically movable manner on
, the balance 6 urges the slide 29 upward.
3.

As is clear from the above configuration, in the present invention, the slide 29 is vertically guided to the frame 45 of the independent frame 43 via guide posts 41 erected at multiple locations near the corners. . Therefore, even if an unbalanced load is applied to a position offset from the center of the slide 29,
This can effectively suppress inclination of the slide 29 due to unbalanced loads.

Further, since the slide 29 is always urged upward by the balancer 63, for example, the main shaft 19
The minute clearances between the eccentric part 21 and the connecting rod 21 and the pivot joint between the intermediate rod and the slide 29 are always pushed upwards, so that the slide 29 When machining is performed by descending, the machining can be performed with high accuracy without being affected by the above-mentioned clearance.

[Brief explanation of the drawing]

Fig. 1 is a front cross-sectional view of a reference example of the present invention, Fig. 2 is a cross-sectional view taken along the - sectional arrow in Fig. 1, and Fig. 3 is a cross-sectional view of a reference example of the present invention.
FIG. 4 is a cross-sectional view taken along the arrow in FIG. Explanation of symbols representing main parts of the drawings, 1...Crank press, 23...Connecting rod, 2
5... Shaft member, 27... Intermediate rod, 31... Second shaft member, 33... Rolling wheel, 35... Guide member, 4
3... Independent frame, 51... Guide cylinder, 53...
ball joint.

Claims (1)

[Scope of utility model registration request] A main shaft 19 having an eccentric part 21 is rotatably provided on an upper frame 9 provided on the upper part of a column part 7 integral with a lower frame 5 having a bolster 3 on the upper surface,
A slide 29 is vertically movably supported on an independent frame 43 provided on the lower frame 5 separately from the column section 7, and a connecting rod 23 has a distal end portion fitted into the eccentric section 21 of the main shaft 19. A crank press is constructed by having one end pivotally connected and the other end pivotally connected to the slide 29, and a plurality of guide posts 41 erected at a plurality of locations near the corner of the slide 29 are connected to the slide 29. A crank press characterized in that a balancer 63 is provided on a frame 45 provided on the upper part of an independent frame 43 to be guided so as to be vertically movable, and the balancer 63 is provided on the frame 45 to bias the slide 29 upward.