JPS59127939A - Knock-out device of press - Google Patents

Abstract

PURPOSE:To prevent the damage of members around a device owing to overload by mounting knock-out bars which are freely adjustable and fixable in the distance to the contact with a knock-out beam to sliding sleeves. CONSTITUTION:A ram 3 descends and working with the ram 3 progresses while knock-out beams 13 and ramming bars 15 remain in contact with the base of a long hole by their own weight. As the working progresses, the top end of the product forces upward the bars 15 and the beams 13 detach from the base of the hole 11 and are thus held afloat roughly horizontally between the base and the top of the hole 11. When the ram 3 starts moving upward, the beams 13 ascends as well while the product is held in the top die which is a female die and the beams contact with knock-out bars 17 near both right and left ends thereof and are prevented from ascending any more. The bars 15 drive out the product from the top die ascending in succession.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a knockout device for a press, and more particularly to an overload relief mechanism for a knockout bar that performs a knockout operation by contacting a knockout beam of a press.

First, the background on which the present invention was implemented will be explained.

FIG. 1 is a partial front view of a C-shaped frame mechanical press 1 showing the state in which the present invention is implemented. In the C-shaped gap part, a member called a ram 3 or a slide that moves up and down with a large amount of energy is installed to move the press with a large amount of energy. It is regulated by a gib 7 on the left and right columns 5.

The ram 3 has an upper mold (not shown) fixed to its lower surface, and pressurizes and forms the plate material placed between it and the lower mold fixed on the bolster 9 provided under the gap part. , perform processing such as punching.

A long hole 11 is provided in the middle of the ram 3 in the vertical direction from side to side.
3 is provided so as to be movable in the vertical direction.

The knockout beam 13 is equipped with a downwardly directed thrust rod 15 that can be replaced, and for example, during deep drawing, the thrust rod 15 serves to push down a product that is held upright along with the ram 3 while being held in an upper die forming a female mold. .

That is, in FIG. 1, the knockout beam 13 is in contact with the bottom of the elongated hole 11, the push rod 15 protrudes most downwardly, and the ram 3 is stopped at the top dead center of the crank (not shown)! However, when the next machining cycle starts, 7 to 6 ix 3 descends and the knockout beam 1
The machining of the ram 3 proceeds while the ram 3 and the push rod 15 are in contact with the bottom of the elongated hole 11 with the milt of A.

Next, as the deep drawing described above progresses, the upper end of the product pushes up the push rod 15, and the knockout beam 13 is pushed out from the bottom of the elongated hole 11, and is approximately spaced between it and the ceiling of the elongated hole 11. It will be floating horizontally.

Next, when the ram 3 turns to its upper back and moves upward, the knocker 1 to beam 13 also move upward while the product is held in the female upper mold, and the knockout par 1 near both left and right ends of the ram 3 moves upward.
The product is knocked out from the upper mold by the push rod 15, which is stopped by the upper back when it comes into contact with the upper mold.

Conventionally, in the knockout device for the above J: eel press, as shown in Fig. 2, a tapped hole 21 is formed in the upper protrusion 19 of the C-shaped flange 18 of the press 1 to determine the vertical hanging length of the knockout par 17. A freely adjustable attachment was used.

In this conventional device, it is necessary to machine the tapped holes 21 after assembling the wooden holes of the press 1 by welding, etc., and the work n has to be moved to the left and right of the press 1 to adjust the hanging length. This has the disadvantage that it is quite troublesome and requires a lot of man-hours, such as the need to make adjustments.

In addition, if the hanging length of the knockout par 17 is set to be unduly long by mistake, the center portion of the knockout beam 13 will be pushed upward by the bottom of the elongated hole 11 of the ram 3, and the knockout par 17 will move the knockout par 17 upward at both ends. As a result of being blocked, the knockout beam 13. Knockout par 17. This has caused an inconvenience that one of the upper front protrusions 19 of the C frame may be damaged.

The present invention has been made to solve the above-mentioned disadvantages of the conventional apparatus, and preferred embodiments thereof will be described in detail below with reference to the drawings.

In the embodiment shown in FIG. 3, a knockout bar holder 23 is attached to the gib 7 to directly hold the knocker and bar 17 in a vertically slidable manner. The distance until it comes into contact with the beam 13 can be adjusted and fixed freely.The one member 25 and the lock nut 27 are screwed together, and the ring member 31 is attached to the knockout par 17 above the bar holding part 23 to the knocker 1 via the bullet vM29. screw 3
Fixed by 3.

The embodiment shown in FIG. 3 streamlines the man-hours required to form a tap hole 21 in the upper front protrusion 19 of the C-frame 1 norm in the conventional device, and instead uses a bullet 29 to constantly knock out the par 17 of the C-frame. The left and right bolt members 2 have the function of urging the lower surface of the upper front protrusion 19 and keeping it in contact with it.
5 can be adjusted from the front, but if the amount of downward protrusion of the bolt member 25 is set excessively, rI due to excessive zero load that occurs around the knockout par 17 can be achieved.
It was not possible to prevent damage to the A transport components.

FIGS. 4 and 5 show a device according to a further improved embodiment of the present invention, in which a gib 7 for guiding the ram 3 or a knockout bar holding portion for holding the knockers 1 to 17 via a slide sleeve 35 is attached to the ram 5. 234- is fixed.

The knockout bar holding portion 23 described above has a rectangular block shape as shown in the figure, and has a round hole 37 in the center extending vertically, and a cut groove 39 in a part of the wall surrounding the round hole 37. Therefore, when fixing the knockout bar holding portion 23 to the gib 7 with four bolts 41 as shown in the figure, it is also possible to adjust the gripping force of the slide sleeve 35.

As is clear from FIG. 5, the slide sleeve 35 described above has a flange portion 42 at its upper end, a bolt-like knockout hole 17 that is concentrically threaded, and a lock nut 43 attached thereto.

In addition, as shown in the upper left part of FIG.
is attached to the slide sleeve 35, and a dog 47 is attached to the slide sleeve 35.
is provided, and when the slide sleeve 35 is pulled upward from the knockout bar holder 23 by exceeding the set gripping force at which the knockout bar holder 23 invites the slide sleeve 35, the detection object /15 is -I - The equipment is wired to detect the abnormal conditions described above and to emergency stop the operation of the press.

Since the apparatus according to the embodiment of the present invention is constructed as shown in item 2 above, the height of the apparatus is adjusted so that the knockout bar touches the knocker 1~beam 1'l and performs the knocker operation. Can be operated from the front of the machine, and press C
The number of man-hours required for tapping the upper front protrusion of the frame has been streamlined, and even if the operating position of the knockout bar is incorrectly adjusted, damage to the members surrounding the knockout device due to excessive Ω (h) is possible. The Song Dynasty was 19 years old.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing a press knockout device, Fig. 2 is an explanatory diagram of a conventional WA fffi, Fig. 3 is an explanatory diagram of a partially improved device, and Fig. 4 is a plan view of an embodiment of the device of the present invention. FIG. 5 is a cross-sectional view taken along the line v-V in FIG. 4. (Explanation of symbols representing main parts of the drawings) 1...Press 3...Ram 13...Knockout beam 17...Knockout bar 23...Knockout bar holding part 35...Slide sleeve 45 ...detector patent applicant AMADA Co., Ltd. Fig. 2 Fig. 3 Fig. 4 Fig. 4'+ 41 Fig. 5 7

Claims (1)

[Claims] A knockout bar holder is provided on the ram guide section or machine frame column of the press that can adjust the gripping force of the slide sleeve and can be fixed, and the knockout bar can be fixed and adjusted the distance until it comes into contact with the knockout beam on the slide sleeve. A press knockout device characterized in that it is equipped with: