JPS6245839Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pneumatic dictation device for a press.

The dictation of a press is a device that is installed in the bed of the press and is used for suppressing wrinkles during drawing or knocking out products through a cushion pin or the like.

Conventionally, a dictation adjustment device and a damper device for a pneumatic dictation have been provided at the lower part of a pneumatic chamber for the dictation and separated from the pneumatic chamber, as shown in Japanese Utility Model Application No. 47-24679. For this reason, the lower part of the dictation device protrudes from the installation surface of the press bed, necessitating a corresponding pit. In addition, the dictation protruding from the bed caused inconvenience during transportation and installation.

Another conventional example is a device shown in Japanese Utility Model Application Publication No. 50-68375, which uses an adjusting mechanism for adjusting the stroke of a dictation, in particular a cushion rod inserted through a nut.
A stopper mechanism is provided at the lower end of the nut.

For this reason, the overall structure has a length that includes the nut and the stopper mechanism, and also requires an oil retainer to accommodate these, resulting in a considerable height, and when installed in a press machine, it is difficult to install at least You'll probably have to dig a pit around the oil stop.

In addition, in the above publication, a part of the stopper mechanism is engaged in the nut, but as is clear from the drawing, only a small part of the stopper mechanism is inserted, and this does not correspond to the above-mentioned problem. This makes it impossible to achieve the goal of making the entire device low-profile.

In addition, a similar device is introduced in Japanese Utility Model Publication No. 46-36958, in which the lower end opening of the adjustment screw is formed in a stepped portion, and a damper that engages within this stepped portion is attached to the piston rod. It is installed at the bottom end, and the entire device consists of a cylinder, case,
Since the oil pans are connected downward in this order, there is a problem in that at least the oil pans have to be accommodated in the pit.

The present invention has been made to solve these conventional problems, and has succeeded in incorporating the entire device into the press bed and using a pittress as the foundation for the press.

In order to achieve the above object, the present invention forms an oil sump on the upper surface of a shelf provided in a pressbed, a casing with an oil chamber communicating with the oil sump on the lower surface of the shelf, and A cylindrical adjustment nut whose lower end faces inside the casing and whose mounting position can be changed in the vertical direction is provided in the reservoir, and inside the adjustment nut there is a small-diameter engagement step and an open end below the engagement step. The cushion rod is formed to have a diameter that allows the damper piston to be inserted into it, and the cushion rod is inserted into the adjusting nut.The damper piston is housed at the lower end of the cushion rod below the engagement stage of the adjusting nut, and the upper end is formed with the shelf board. It is characterized by a cushion pad that protrudes upward from the bottom.

Next, embodiments will be described with reference to the drawings. The drawing shows the entire dictation device, and the device according to the invention is installed in a pressbed 1.

The cushion pad 3 is guided in a vertically movable manner by a guide 4 provided on the bed 1, a cushion rod 5 is fixed to the lower surface of the cushion pad 3, and a damper piston 10 is provided at the bottom of the cushion rod 5.

A casing 6 is provided on the lower surface of the shelf board 2 provided on the bed 1, and an oil chamber 6a connected to the casing 6 is provided at a position corresponding to the cushion rod 5. A worm gear 7 is attached to the casing 6 and is rotated by a motor. Further, a worm wheel 8 that meshes with the worm gear 7 is rotatably held in the casing 6. The adjustment nut 9 attached to the lower part of the cushion rod 5 has a threaded portion 9a provided on its outer diameter portion that engages with a threaded portion 8a provided on the inner diameter portion of the worm wheel 8, and furthermore, the screw 11 is attached to the shelf. This kotta 11 is provided on the board 2.
fits into a groove provided in the axial direction on the outer diameter of the adjusting nut 9, and serves to prevent the adjusting nut 9 from turning.

The adjustment nut 9 has a small-diameter engagement step portion 9b inside.
Furthermore, the diameter from the engagement step portion 9b to the lower opening end is formed to allow insertion of the damper piston 10, and when the damper piston 10 rises, hydraulic pressure is generated between the damper piston 10 and the engagement step portion 9b. There is.

As described above, the damper piston 10 enters the oil chamber 6a of the casing 6, and the damper piston 10 extends axially from the lower end surface of the cushion rod 5 and communicates with the oil chamber 6a through the hole 5a that opens at the side of the rod. A fastening portion 3b is provided above the shelf board 2. The oil retaining portion 3b is in the same room as the air pressure chamber 3a for the dictation, but the oil retaining portion 3b has a cylindrical fence 12 that communicates with the air tank.
is provided to prevent the oil in the oil retaining portion 3b from flowing over the fence 12 and into the air tank.

Next, the effect will be explained.

Regarding the stroke adjustment of the dictation, when the worm gear 7 is rotated, the worm wheel 8 is rotated, and the adjusting nut 9 is raised by the screw action.
descend. As a result, the position of the engagement step 9b where the adjusting nut 9 and the damper piston 10 come into contact moves up or down, so that the upper limit position of the cushion pad 3 is adjusted. That is, since the lower limit of the cushion pad 3 does not change, the stroke length of the cushion pad changes.

About the damper The cushion pad 3 rises due to air pressure.
A shock is generated when stopping at the upper limit.
An engaging stepped portion 9b provided on the inner diameter of the adjusting nut 9 and the damper piston 1 to alleviate this impact.
Oil is squeezed by the outer diameter of 0 to generate hydraulic pressure, and this resistance is used to absorb and alleviate shock.
At this time, the pressure oil flows through the oil stopper 3 from the gap between the inner diameter of the adjusting nut 9 and the outer diameter of the damper piston 10.
b or is pushed out to the oil chamber 6a.

As explained above, in the present invention, the upper part of the shelf board provided in the pressbed is formed as an oil sump part in the same room as the air chamber of the dictation, a casing with an oil sump is provided below, and the upper end is made into the oil sump part. An adjusting nut with a lower end facing inside the casing is formed into a cylindrical shape, and the adjusting nut has a small-diameter engagement step inside and a diameter such that a damper piston can be inserted from the engagement step to the lower opening end. Since the damper action of the damper piston, which rises as the cushion pad rises, is performed within the adjustment nut, the dictation device The overall length is shortened, and therefore the dictation device does not protrude from the lower surface of the bed, so that the press base can be made pitless.

[Brief explanation of the drawing]

The drawing is a cross-sectional view of the entire assembled dictation device of the present invention. 1...Bed, 2...Shelf board, 3a...Air chamber,
3b...Oil reservoir, 3...Cushion pad, 4
...Guide, 5...Cushion rod, 5a...
Hole, 6...Casing, 6a...Oil chamber, 7...Worm, 8...Worm foil, 9...Adjusting nut, 8a, 9a...Threaded portion, 9b...Engaging stepped portion,
10... Piston for damper, 11... Kotta, 1
2... Fuens.

Claims (1)

[Scope of utility model registration request] The upper surface of a shelf provided in the press bed is formed into an oil sump in the same chamber as the air chamber of the duct, and a casing with an oil chamber communicating with the oil sump is provided on the lower surface of the shelf, and the upper end is formed into an oil sump. A cylindrical adjustment nut whose lower end faces inside the casing and whose mounting position can be changed in the vertical direction is provided, and inside the adjustment nut there is a small diameter engagement step and a damper from the engagement step to the lower open end. A cushion rod is inserted into the adjustment nut, and the lower end of the cushion rod has a damper piston housed below the engagement stage of the adjustment nut, and the upper end has a damper piston inserted upward from the shelf board. A pneumatic dictation characterized by a protruding cushion pad.