EP2889111A1

EP2889111A1 - Ejector for punched sheets of cardboard, for blanking presses or autoplaten press

Info

Publication number: EP2889111A1
Application number: EP14382506.5A
Authority: EP
Inventors: David Garcia Crespo
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-12-12
Filing date: 2014-12-11
Publication date: 2015-07-01
Anticipated expiration: 2034-12-11
Also published as: ES2612432T3; EP2889111B1; ES2537839B1; ES2537839A1

Abstract

Ejector cuts paperboard sheets, for flat stamping or autoplaten presses, wherein that ejector consist of a male base (1) having the active face at the same height a number of pushers (4) and a flat plate (2), which occupies the inner region and has the same perimeteral configuration and same windows (21) and which is expected to practice in the cardboard sheet to be cleaned; peripherally around the flat plate (2) there is a series of plates (3), which outwardly delimit the outliner of the blank sheet (1) and towards the interior the profile of the zone facing the plate (2) and of the strips, straps or pushers to be run between the two elements, each of these plates being mounted (3) into a threaded coupling (6) running through a slot (31), perpendicular to the plate (2), which allows a millimetrically aproach the corresponding plate (3) to cutting strips or uncutting strips.

Description

Object of the Invention

The present invention, as its title suggests, refers to an ejector cuts sheets of cardboard, for flat stamping presses or autoplaten press. The invention concerns both the male ejector, or part called ejector tool, and the female part of that ejector, both in order to ensure cleaning of leftover cuts on cardboard sheets or similar products, the kind which are used primarily in the packaging sector, such as boxes or packing, displays, or derivatives thereof.

Background of the invention

This ejector is intended for a flat stamping press or an autoplaten press, in which both male and female parts, are flat and the displacement of the male is perpendicular to the plate, so that with modern machines punching achieves high accuracy and perfect timing in registering the male with the female part in cleaning or removing cuts. In a first phase the die properly speaking acts itself carrying out all the cuts expected in one action, then the sheet already cut passes to a second stage where is the male ejector and the central plate or female ejector, where the punched sheet is located is positioned precisely above the female ejector, so that the autoplaten press active mechanisms necessary for the male ejector drops and impact on the cardboard sheet, push and separate discriminately only leftover generated in both windows or inner holes as the peripheral excess is termed as leftover cuts or leftover cardboard material.
An ejector is composed of: a male base, which presents a surface, preferably of wood, in which strips of different types of strips are fitted, with or without teeth, blocks can be wooden, plastic or metal spikes or punches and all of them non-cutting; All these elements have the task of pushing and removing from the punched sheet the material sections or areas called (cutout or excess material), for recycling if it is permitted. A bottom plate, technically called Central plate expulsion, it constitutes the called female ejector; this plate is manufactured in a material of carbon steel scaled for extreme cases or weak areas, or in wood, and presentes peripherally the form of a positive offset or expanded, corresponding to those practiced in the cardboard, or so that cuts pass through them when they are pushed by the ejection elements located in the above-mentioned male base.
As the male ejector is concerned, the problem with this action is the possibility of jams in the expulsion of the cuts, motivated by the fact that the cardboard on the male side, is only holded and supported in certain areas in which these foam blocks, natural rubber or similar material that have to hold and retain the sheet, are placed. while not cutting strips and strip pushers penetrate the cuts in female side, and having to drop out there all leftover cardboard cutouts, giving way to the blade cleanly in the end zone of the die.
Delimiting the outliner of the punched sheet, in the traditional male parts are attached immovably to the base of the male ejector. Parts that sometimes the operator of the cutting machine has to move roughly and mainly through hitting them with a hammer slightly, getting them closer or away from the steel strips to get the cardboard cutout is aligned in the right proportion.
These elements, strategically placed, have to push and pull the outer perimeter outliner and shaped windows or inner holes entirety; for this now is necessary to place a very high percentage, a series of punches lower expulsion, in an area of the die that is just below the female ejector, which carries a telescopic grilled spikes to follow the cut and effectively drops. Placing these punches is done manually, placing the driver or machine operator of the stamping press inside the maquine, to go placing them in all cuts to expel. Also comment that there is a lot of presses or autoplate, which do not have this lower grill spikers.
As for the central ejection plate or female cleaner is concerned, when the blank sheet has an irregular perimeter outliner, and reaches the body or area where the female cleaner is located, the area of perimeter cuts hangs by a mini attachment points , the operator previously given to strip die strategically, so that the blank sheet not disassemble during scrolling through th stamping press clips or autoplate press that holds the cardboard sheet. In many cases this is a reason to stop the machine and considerable loss of time, because the operator has to give with great skill and ability, the thickness and exact position of the point, so that it would be as accurate as to hold during displacement but allows to break, when the male pushers take action.

Description of the invention

This new system cuts-ejection of the male ejector or upper expulsion tool, is ensuring cleaning or the expulsion of complete cuts, preventing loss and optimizing time, since this action is not necessary placement female telescopic ejector below the spikes. The invention also aims to correct the previously mentioned problems: firstly get hold the blank sheet of cardboard in all its inner surface, for tenths of a second before the tooling ejector impact occurs, acting the suitable pushers, which acts as pusher cuts. The second object of the present invention consist of to provide certain mobility to the parts which delimit the outliner of the male ejector, so that by loosening and tightening a screw, the operator can place them accurately tight in the desired position, without the need to hit them as today.
To achieve these objectives the male ejector presents the active face at the same height in which pusher cuts , when they are in the rest position a manufactured wooden base or high density foam or compressible, which presents a profile or silhouette of the stamped sheet, saving and allowing it to be crossed by strips or pushers spikers.
This sheet or plate, also invades if not wholly, a large surface areas to expel or push, in order to retain and keep up the cut and forcing it out of the area of the female that corresponds. Besides that the first major innovation contains as second major incorporation, which allow the elements or parts that expel the perimeter outliner, go with a system that allows moving and adjust to the needs of each die and material as in machine operator considers there to zoom in, out, up or down.
That plate is mounted in parallel with the male base through several telescopic centering elements, which have internally a spring which allows compression and therefore the displacement of the plate get closer to the base which forms the male die, in the moment of the impact. The above mentioned centering elements are formed by at least two cylinders telescopically displaced one inside the other, to a position proximate to the inner base, limiting to the maximum extent distance that has to situated the plate with respect to the base and compression, introduced one inside the other, leading to compression of the inner spring to a distance that defines the position of the plate at the moment of impact for steel strips and the ejectors operating properly.
Around the flat plate described in the previous section, a number of peripheral flat plates are situated , which externally delimit the male outliner and internally match with the profile of the facing area of the front plate and about the steel strips have to pass between both elements. Each of these peripheral plates is mounted on a threaded coupling which runs through a slot that is perpendicular to the outer face of the male, in order to make a millimeter approximation of the corresponding plate to the steel strips. This threaded coupling also allows height adjustment of these peripheral plates, either through interposition of a washer, a spring or any other means to tightening or loosening these screws slightly vary the height of the piece.
It is planned that all perimeter plates or outliner, that forms the active face of the male present a rough outer surface to ensure the fastening of the cut, but not in the central plate which will hold the entire inner surface of the sheet, the outer face will be coated by a varnish or superfine nonstick finish, avoiding the formation of marks on the cardboard, in the moment of impact of the central plate of the male ejector.
Regarding innovation center expulsion plate or female cleaner, the big news that incorporates a perimeter frame, which is always greater than the size of the blank sheet, so that this framework through profiles or crossbars, holds and stabilizes the punched cardboard sheet, particularly around the perimeter cut, as with the traditional center plate the cutting is not hold at any time, leaving it free. These mooring profiles will be placed strategically, so that does not obstruct the perfect expulsion of the cuts, the only and main object is stabilizing the sheet of cardboard, and that this rests perpendicular and parallel to the central expulsion plate, so that when the male ejector pushers act, the blade will be in the best position to be able to avoid leftover cuts.

Description of the figures

To comple the description being made and in order to facilitate understanding of the invention characteristics, the present specification is accompanied by a set of drawings in which, as a way of illustration and unlimited, show the following:

Figure 1 shows respective top and sectional views along the line marked on the floor of the male ejector, in rest position.
Figure 2 corresponds to a sectional view of the male ejector at the instant of impact.
Figure 3 shows respective top and sectional views along the line marked on the floor of the base (1) forming the male ejector
Figure 4 shows respective top and sectional views along the line marked on the floor, of the plate (2) situated on the active face of the male ejector.
Figures 5 and 6 show in detail the coupling of the peripheral plates (3) to the base (1) of the male ejector.
Figure 7 corresponds to the top view of the central expulsion plate or female cleaner (7) standard, where you can see the representation of the perimeter of the sheet, which when placed in position, rests on no area, float in the air or inclined by their own weight, causing difficulties during the expulsion.
Figure 8 corresponds with respective top and side views of a detail of the central expulsion plate or female cleaner (7), the area in which it presents profiles or crosspieces (8) that facilitate the removal of cut.

Preferred embodiment of the invention

As shown in the figures, the male ejector have a base (1), formed by a plate of wood or other alternative material, which has an identical configuration of the peripherally cutting as the cardboard sheet, previously stamped with the die, and with preestablished tolerances, for both the perimeter and the inner zones. Through various peripheral plates (3) the cutting plants and number plates is defined, to follow precisely and rigorously this outliner. These plates (3) are varied and are strategically placed on the sides, mainly in number of two for each side, to allow move slightly to the inside and outside, up and zero line so as to fit them millimetrically to the position that the machine operator sees , as to the distance of the cardboard sheet, as regards the outliner, with respect to the cardboard blank sheet.
On the base (1) the pushers are fixed at various strategic points (4) to extract the cuts through holes and windows are going to be done in the cardboard. All these pushers (4) are at the same level with the peripheral plates (3) and, as the female expulsion base (not shown) has the same shape as this, the stroke of the male against it causes the sheet is detached, while cuts are pushed through the windows has in correspondence to the purpose.
Coinciding with the area and shape in which the cardboard sheet should be cut , a plate (2) is placed, fixed to the base (1) of the male ejector throughseveral centering elements (5), so that it is flush with the peripheral plates (3). This plate (2) also has the same shape and the female and the gap defined on the base (1) by the plates (3), except that a sufficient channel is left between them for the passage of strips uncutting; likewise in the windows (21) also it is provided enough offset or tolerance to let the strips and pushers pass through (4). This plate is shown in detail in Figure 4.
Mounting the plate (2) on the base (1) it is done through a several centering elements (5), each of them has at least two cylinders that move telescopically inside one another, to a position proximate the inner base, defining to its maximum extent the distance has to take place the plate (2) with respect to the base (1) and its compression, introduced one inside the next, leading to compression of the internal spring (51) to a distance that defines the position of the plate (2) at the moment of the impact to steel strips and the ejectors (4) act appropriately. These two positions are seen in Figures 1 and 2.
A remarkable detail of the invention resides in the peripheral fixing plates (3) in the base (1), which will be hel through a Allen screws (6), which engage in slots (31) which are perpendicular the edge of the base of the male ejector (1), so that the operator can easily, to loosen slightly this screw, place each plate (3) independent at the right distance from strips of steel or other material.
The plate (2) has a smooth surface and optionally a nonstick finish varnish or superfine, and the plates (3) preferably have a rough surface, to ensure the grip of the pushing pieces of cardboard.
In Figure 7 the central expulsion plate or female cleaner (7), which incorporates a several windows (71) slightly larger than the cuts made in the cardboard to facilitate the exit of the cut through them also a perimeter frame (73) is greater than the size of the punched sheet, so that between it and the female plate (7) itself there is a gap (72) in which the cardboard precut cardboard sheet remains. In this gap (72), coinciding with the zones of transversal, cutting profiles or crosspieces are placed(8) holding sheet and stabilizes the carton blank, especially in the area around the perimeter cut, as the traditional central plate, The cut does not remain fastened ever, leaving it flying. These profiles mooring (8), strategically placed, that does not prevent the perfect expulsion of the cuts, the only and mainly object is stabilizing the sheet of cardboard, to rests perpendicular and parallel to the Central expulsion plate so that when acting pushers of the male ejector the sheet is in the best position to be able to avoid leftover cuts. The fixing of these clamping profiles (8) takes place through the rear face of the female plate (7), set in two wooden slats (9), which in turn are fixed to the rear face of this plate, through at least one transverse screw.
Having sufficiently described the nature of the invention and an example of preferential accomplishment, stated for all purposes that the materials, shape, size and arrangement of the elements described can be modified, Always and when does not suppose an alteration of the essential characteristics of the invention claimed below:

Claims

Cut sheets ejector of cardboard, for flat stamping presses or autoplaten, used primarily in the packaging sector, in shaping packing or boxes, in which ejector is a part of a male base that incorporates a number of strips, and pushers, jagged spikes or punches, all non-cutting, necessary for the expulsion of the leftover generated in the carton interior windows or holes and the peripheral remaining, through the female base, which represent for this purpose a series of holes in correspondence with the windows and holes to practice, characterized in that the ejector male base (1) presents the active face at the same height on which the pushers (4) are in the rest position:
- A flat plate (2), which occupies the inner side and has the same perimeter configuration and the same windows (21) which is expected to be done on the sheet of cardboard to be clean, but with a slight margin so that steel strips and pushers pass through them, during the impact with this plate (2) mounted in parallel with the male base (1) by means of several telescopic centering devices (5) with an inner compression spring and allowing movement of this plate (2) being in approach to the base (1), in the impact of the male ejector elements;

- Peripherally around the flat plate (2), a series of plates (3), also flat, which outwardly delimit the outliner of the punched sheet and the inward facing profile of the area of the plate (2) and of the strips, straps or pushers to be run between the two elements, each of these being mounted plates (3) into a threaded coupling (6) running through a slot (31), perpendicular to the plate (2), which allows a millimetrically aproach to the corresponding plate (3) cutting strips or strips.
Ejector according to claim 1, characterized so that the central expulsion plate or female cleaner (7) incorporates a peripheral frame (73) is greater than the size of the blank sheet, defining between it and the female plate itself (7) a gap (72) which, coinciding with the cross sectional areas, there are profiles or crosspieces (8) strategically placed, which secure and stabilize the sheet of punched cardboard, perpendicular and parallel to the plate Central expulsion (7).
Ejector according to claim 1, characterized so that the centering devices (5) are constituted by at least two cylinders that move telescopically inside one another, to a position proximate to the inner base delimiting at maximum extension the distance that has to place the plate (2) with respect to the base (1) and its compression, introduced one inside the next, leading to compression of the internal spring (51) to a distance which delimits the position of the plate (2) at the time of impact for steel strips and the ejectors (4) act appropriately.
Ejector according to claim 1, characterized so that the plate (2) has a smooth surface and optionally a nonstick finish varnish or superfine.
Ejector according to claim 1, characterized so that the plate (3) preferably have a rough surface, to ensure the grip of the pushing pieces of cardboard.