DE9003329U1 - Device for removing break-out parts from a sheet of material or similar. - Google Patents

Description

μ-248.02 6

Tfarrichtang «■ &igr;««&igr; by AeilflP from etna» qenod.dql.

The invention relates to a device for removing broken pieces, for removing all pieces from a material contained in blanks, on a breaking surface.

se rests that the breakout part ei. .an breakthrough of the breakout surface

and is printed by this under pressure from at least one stripping element, in particular a stripping pin, whereby the stripping element is assigned an abutment guided in the direction of movement of the stripping element below the stripping part.

For more than 30 years, automatic punching machines for producing blanks from cardboard sheets in the folding box industry have been equipped with stripping devices, which are preferably located in a setup table outside the punching machine. Such a stripping station is of particular importance for production, since if used incorrectly it takes up the largest share of the total setup time and a poorly adjusted stripping station leads to ongoing disruptions in the production process.

During stripping, the punched cardboard sheet is freed from waste by means of stripping pins or cutters pressing from above after it has reached a predetermined rest position on the stripping surface usually offered by a stripping board or a die.

•J*i ! J ." &idigr;&iacgr;&idigr;&Igr;

μ-248.02 * 7

In the bits of stripping technology, the first thing that came into being was the upper tool pin, which pushed from above and guided the waste piece through the opening in the stripping board. Then came an additional lower tool with a pin under the pin, which was connected to the

aligned and hold the ^ofallstück clamped.

Since a stripping tool can only safely strip a waste piece if there is a certain force connection between the tool and the waste piece, the above-mentioned lower pins form a favorable resistance at the moment the stripping tool or stripping element hits the

proved to be a waste of time.

If you want to avoid a clamping tool, the breakout opening in the breakout surface must be kept smaller in various places than the waste piece assigned to it, so that the latter rests on the breakout surface or die with higher friction in small areas. The resistance now arises when the breakout pin hits the waste thanks to the friction generated. When the breakout pin and the waste piece pass through the opening, friction occurs on the narrower hole walls, which creates a certain degree of force.

Also well known is the so-called DYN pin, a stripping pin with a tip whose essentially conical side walls have concave contours in cross-section. During the stripping process, this tip hits the waste piece, which offers enough resistance to the tip when it is placed on the break-through edges that the tip can penetrate slightly into the material of the waste piece. This prevents the waste piece from moving sideways.

When passing through the opening, the waste piece bends; the tension between it and the opening wall provides the DYN pin with sufficient friction to achieve the desired force connection with the waste piece, which may make a lower tool unnecessary when using the DYN pin.

Knowing this state of the art and the stripping process with or without a lower tool, the inventor has set himself the goal of further improving the stripping of waste pieces from material sheets and, above all, of simplifying the tool required for this and its handling.

To solve this problem, a device of the type mentioned at the beginning provides that the abutment is a surface that can be moved within the opening at a distance from the stripping surface and/or is resilient, which in its rest position grips the waste piece in the sheet of material roughly parallel to it and when the waste piece is moved - i.e. primarily when it is lowered - it can be converted by the stripping device into an angle of inclination to the sheet of material. It has proven to be advantageous for this purpose that the resilient surface is formed by a tongue-like spring, which is fixed at one end to the stripping surface or the so-called stripping board and whose free end is arranged in the opening and is roughly flush with the stripping surface in the rest position mentioned.

M-248.02

Thanks to this measure, a spring-loaded abutment is created within the opening, which - after positioning the punched sheet in the stripping station - is in its resting position below the waste piece to be stripped out and brings the lowering stripping pin or similar into force connection with the waste piece. The stripping pin or similar guides the waste piece and abutment downwards until its angle of inclination is sufficient to push the now stripped out waste piece sideways due to the inclination during the downward stroke - in relation to the free edge. In its discharge position, the support angle of the abutment or the spring tongue is so steep that the waste piece can no longer find a hold. Tests have shown that the pushing away takes place by the waste piece darting away at surprising speed.

Thanks to the spring force, this discharge process occurs equally with all types of stripping bodies, but it works best when using the well-known DYN pen with a strongly tapered tip.

After the waste piece has been released, the spring swings back to its resting position to be ready for a new breaking-out process.

In a special design of the bearing of the spring tongue, it is also guided sideways during its downward movement, thus describing a partial circle with its free edge.

It has proven to be advantageous to bend the free end of the tongue-like spring into a step or to fold it around at least two bend lines; this deformation creates an additional spring force in addition to the spring constant of the material.

AL-248.02 10

According to a further feature of the invention, at least one edge recess should extend from the free edge of the spring as a lateral limitation of the path of movement of the stripping device or stripping pin. Instead of this mostly partially circular edge recess or - in the case of several stripping devices - in addition to it, a hole can be provided within the spring surface, the width of which is larger than the cross section of the stripping pin or the like, so that - as with the edge recess described - the latter cannot come into direct contact with the spring surface on its way downwards. This measure also significantly improves the discharge effect.

The opening in the discharge board is usually shaped to suit the piece of waste to be removed therein. According to the invention, the opening arm, which is preferably directed transversely to its longitudinal axis, is connected to it for receiving the spring, which is fixed at one end to a support profile running in the opening arm, for example, and with this determines the angle of inclination already mentioned. This support profile or its support section can either be flush with the surface of the stripping board or run at a distance from it, which entails a correspondingly different shape of the spring tongue, which can then also carry a pin Γ\ that swings with it and is coaxial with the stripping pin that can be inserted from above in the rest position.

Within the scope of the invention, there are a number of designs of the spring tongue and its fastening. For further features, reference is made to the subclaims.

AL-248.02 11

The principle according to the invention is also implemented by a rigid bearing surface which can be lowered to a distance from the stripping surface and can also be adjusted to the angle of inclination described. For this purpose, a body which can rotate about an axis provided next to the path of movement of the stripping pin(s) or the like can be provided, the circumference of which has several surfaces which are inclined to the radii of the axis.

A roller whose cross-section is constructed from several interlocking circles and which has a circumferential groove through which the path of movement of the stripping pin is laid tangentially is particularly suitable for this purpose. It is also possible to place two disc-shaped rollers on the axle instead of one roller with a longitudinal groove, which have aligned circumferential contours and between which the path of movement of the stripping pin lies.

The main advantages of the stripping board according to the invention with its movable or spring-loaded abutments provided in the stripping openings are its simplicity and low cost; complicated lower tools are unnecessary, and there is no need to adapt the lower pins to a new stripping board, since its abutments are replaced with the new one.

M-248.02 12

Further advantages , Mwfcmait. and details of the invention emerge from the following description of preferred embodiments and from the drawing; this shows in

Fig. 1: the top view of a part of a stripping board for removing waste pieces from cardboard sheets in the folding box industry;

Fig. 2: the section through Fig. 1 along the line II-II;

Fig. 3: a part of Fig. 2 for a further embodiment;

Fig. 4: top view of a broken-out piece of waste;

Fig. 5: the top view of a part of another break-out board with a spring tongue arranged in an opening;

Fig. 6: the section through Fig. 5 in rest position of the spring tongue; |

m Fig. 7, 8: the corresponding reproductions of Fig. 6 under- ||

different operating positions of the spring tongue;

Fig. 9t is an enlarged detail from Fig. 6 to β;

Fig. 10,11: Partial sections through other versions of the device;

13

&igr; ■ &ngr;

·

M-248.02 13

Fig. 12 to

Fig. 14: Oblique views of different spring tongues«}; '

_:-. 16: a SsilgagesshBitt. through a stripping board with a rotating abutment for waste pieces;

Fig. 17: an oblique view of the abutment of Fig.

16; I

Fig. 18: the front view of another embodiment of the abutment;

Fig. 19: a cross-section through a stripping board with a pair of associated spring tongues;

Fig. 20: an oblique view of a part of Fig. 19;

Fig. 21,22: Partial sections through other designs of the breaking board.

Blanks for folding boxes or similar are punched out of cardboard sheets }0 used in the folding box industry, in or on which waste pieces 12, 12 _fi are created.

After a punching station (not shown in the drawing for reasons of clarity), the punched cardboard sheet 10 is passed to a breaking board or a die 14, on which it is freed from small waste pieces 12, _12a ; these are located above ~ designed depending on their contour -

14

4 t · I

M-248.02 14

Openings 16, in which in the cross section of Fig. 2 an upper frame part 17 with vertical walls is followed by a canoe part opening downwards.

Small edge zones of the waste pieces 12, 12 ^' are located on the stripping board 14, _the impact areas 12' of which run at a distance within the breakthrough contours 16' on the surface 15 of the stripping board 14. This creates zones with a relatively high friction coefficient and a zone of lower friction, designated N in Fig. 7.

Stripping members 20 in the form of pins or—in Fig. 1, 2 on the right, for example—as strips or pressure cutting members 20_ press down on the waste pieces 12, 12 _Q from above, in a point-like manner, whereby stripping members of a different design, not shown, can also be used.

j±e waste pieces 12,12, are separated from the cardboard sheet 10 and led away downwards in the stripping direction &khgr;.

Fig. 3 shows a stripping tool with a clamping or lower pin 22, the surface of which rests against the undersurface of the waste piece 12 coaxially with the upper stripping pin 20, clamping the waste piece 12 with the latter and thus leading it out of the opening 16. Fig. 4 shows a typical multi-armed waste piece 12 _fc , on which - corresponding to the marked points 20· - eight stripping pins 20 act, of which only two (black points) are supported on a coaxially provided lower pin 22.

»-248 15

The exemplary section of a stripping board 14 according to the invention according to Figs. 5 to 8 shows an approximately rectangular opening 16 for a stripping waste strip 12, to which a opening arm 24 is connected transversely to its longitudinal axis M for receiving a stepped support profile 26; this is fixed at one end by screws 25 or the like to a short bearing section 27 on the underside of the board 15, so that a support section 28 - longer than the profile section 27 - extends close to the board surface 15 and whose end edge 29 runs at a small distance b from the parallel opening edge 16.

The free length i of the spring tongue 30 of approximately 35 ran corresponds in the selected embodiment rgJiezu to three times the thickness q of the stripping board 14 or also the height of its opening 16. The cone angle t of the cone part 18 of the opening 16 is more than 50".

t:\ the lower surface of the support section 28 is fitted with a spring tongue 30, which is riveted or similarly attached to the latter with its rear end region and can otherwise be pivoted downwards by spring. A bearing step 32 is arranged in front of the end edge 29 of the support section 28 at its free end and is directed upwards in a cranked manner. In the rest position shown in Fig. 6, the bearing step 32 is located in the opening 16 and the upper side of which is approximately flush with the surface 15 of the stripping board 14.

When the stripping pin 20, which is equipped with a pressure tip 21 with a concave circumference as shown in Fig. 9, is pressed onto the waste strip 12 that overlaps the bearing step 32 of the spring tongue 30, the waste strip is guided downwards and remains clamped between the bearing step 32 and the stripping pin 20.

• I It·!

M-248.02 16

held until the bearing step 32 forms a deflection angle w of approximately 45* with the horizontal support section 28 and the broken-out waste strip 12 can snap away sideways (arrow z); this detachment process is facilitated by the shape of the pressure tip 21 of the break-out pin 20, but can also be carried out with break-out pins 20 with a flat pin face (Fig. 10, 11).

As can be seen from Fig. 5, the bearing step 32 of the spring tongue 30 has a part-circular recess 34 in the area of its free edge 33, within which the movement path of the break-out pin 20, determined by the pin axis A, runs.

The spring tongue 30 in the embodiment of Fig. 10 is curved in a loop-like cross-section between the bearing stage 32 and the fastening end and is fixed under the support section 28 of a U-shaped support profile 26, the transverse wall of which has a

* α

30 has a cutout 36 through it; the edges of which limit the spring deflection.

According to Fig. 11, 12, instead of the support profile 26 in the breakthrough arm 24, an axle bolt 38 can be fixed that crosses and holds the spring tongue 30 that is rolled spirally at its bearing end 31. Instead of the edge recess 34 described, here - as ;1

also possible in other examples - an elongated hole 34 is present at a distance from the free edge 33, through which the movement path of the stripping pin 20 leads.

According to Fig. 13, a spring tongue 30 fixed at one end at a distance from the surface 15 of the stripping board 14 is bent upwards with its free part and folded to form a double-layered bearing step 32, ν; this design increases the elasticity of the device considerably . Correspondingly folded free ends are also possible with spring tongues 30 projecting approximately vertically into the opening 16 according to Fig. 14. . S

17

M-248.02 17

In the embodiment according to Fig. 15, a spring-mounted pin 22 protrudes upwards from a spring tongue 30 provided at a distance from the surface 15 of the tally board 14 and ends slightly below the surface 15.

Instead of a bending spring tongue 30, a roller 40 can be mounted in the breakthrough arm 24 on a horizontal axis 28, so that it can rotate in stages, the cloverleaf-like or cross-shaped cross-sectional contour of which is composed of - in this case four - partial circles; the outer surface 41 of the roller 40, made up of bead strips thus created, form abutments for the stripping pin 20 or the waste piece 12 that can be moved downwards against the force of a spring 42. The roller 40 is also provided with a central circumferential groove 44 for the passage of the pin axis A. Instead of the roller 40 with its circumferential groove 44, two roller disks 40 ₉ can also be arranged at a distance e from one another on the axis 38.

α el

be fixed (Fig. 18).

Fig. 19 shows two approximately vertical leaf springs _30v on either side of the opening 16. These leaf springs 30 flank a passage gap 46 (Fig. 20) which determines the path of movement of a stripping pin 20 with a flat end edge or cutting edge. According to Fig. 21, such a passage gap 46 is limited by springy gunmina noses 48 or brush-like inserts 50 (Fig. 22). The bristles 52 of the brushes 50 run transversely to the pin axis A and are of decreasing length in the direction of pressure, so that on the one hand they can serve as abutments and on the other hand they enable the waste piece 12 to be guided downwards.

Claims (26)

&Mgr;-248.02 CLAIMS 1. Device for removing stripping parts, especially waste pieces, from a material sheet containing blanks or the like, which rests on a stripping surface in such a way that the stripping part spans an opening in the stripping surface and is pressed through it under the pressure of at least one stripping element, in particular a stripping pin, whereby the stripping element is provided below the ^ ' Stripping part in the direction of movement of the stripping device guided abutment is assigned, characterized, that the abutment (30, 41) is a surface which is movable and/or resilient within the opening (16) at a distance from the stripping surface (15), which in its rest position engages approximately parallel to the waste piece (12) located in the material sheet (10) and, when the waste piece is moved by the stripping member (20), in particular when the waste piece is lowered, is inclined at an angle (w) to / \ material sheet can be transferred. 2. Device for removing stripped parts, especially waste pieces, from a sheet of material containing blanks or the like, which rests on a stripping surface in such a way that 'the stripping part spans an opening in the stripping surface and is pressed through it under the pressure of at least one stripping element, in particular a stripping pin, wherein the stripping element below the stripping part is assigned an abutment guided in the direction of movement of the stripping element, characterized in. M-248.02 that the abutment is formed by two surfaces (32 _d , 48, 50) made of elastic material which delimit a passage gap (46) for the breaking-out element (20) and can be inclined towards this, which receive the outer element (20) or the like in the passage gap (46) when it is lowered and can be returned to their rest position. 3. Device according to claim 1 or 2, characterized in that the elastic surfaces delimiting the passage gap (46) are end regions of springs (30) bent in the manner of a desk. 4. Device according to claim 1 or 2, characterized in that the elastic surfaces delimiting the passage gap (46) are desk-like inclined noses made of elastic plastic or Gurani. 5. Device according to claim 1 or 2, characterized in that the elastic flat brushes (50) delimiting the passage gap (46) are the bristles of which extend to the movement path of the stripping member(s) (20). ) 6. Device according to claim 5, characterized in that the length of the bristles decreases in the pressure direction (x). 7. Device according to claim 1, characterized by a tongue-like spring (30) which is fixed at one end to a stripping board (14) or the like offering the stripping surface (15) and whose free end (32) is provided in the opening (16) and is approximately flush with the stripping surface in the rest position. 49- 8. Device according to claim 1 or 7, characterized in that the tongue-like spring (30) is fixed with its bearing end in an opening arm (24) of the opening (16) and runs transversely to its longitudinal axis (H). 9. Device according to at least one of claims 1 to 7, characterized in that the opening (16) widens conically towards the underside (15) of the breakout surface (14) at least in its area adjacent to the underside (15). '1 10. Device according to claim 9, characterized in that the ψ cone angle (t) of the conical extension (18) of the opening (16) is more than 50°. 11. Device according to claim 7 or 8, characterized in that the free end (32) of the tongue-like spring (30) is made of whose plane is bent to form a step. : 12. Device according to claim 7 or 8, characterized in that the marking strip forming the spring (30) is folded at a free end about at least two fold lines (Fig. 13, 14). 13. Device according to at least one of claims 7 to 12, characterized in that at least one edge recess (34) extends from the free edge (33) of the spring (30) as a lateral limitation of the movement path of a breaking-out element or breaking pin (20). 14. Device according to claim 13, characterized by a partially circular edge recess (34), μ-248.02 15. Device according to at least one of claims 7 to 12, characterized in that near the free edge (33) of the spring (30) there is provided at least one hole (34 _R ) in the latter. &te "gzä&ec is ä£s - ^; d5ae .QaeesÖBiit>' of the or break-out pin (2G). 16. Device according to at least one of claims 7 to 15, characterized in that the spring (30) is fixed at one end to a support profile (26) provided in the opening (24) which runs close to the break-out surface (15). 17. Device according to at least one of claims 1 to 15, characterized in that the spring (30) is fixed at one end at a distance from the break-out surface (15) and the free spring end is bent towards this. 18. Device according to at least one of claims 1 to 15, characterized in that the spring (30 _y ) is fixed with a cross-sectionally spirally rolled bearing end (31) at a distance from the break-out surface (15). 19. Device according to claim 18, characterized in that the rolled layer end (31) d
(38) or similar bolt. the rolled bearing end (31) of the spring (30 _y ) on an axis 20. Device according to at least one of claims 1 to 15, characterized in that the spring (3C_) extends at a distance from the break-out surface (15) and carries at least one attachment (22) which projects upwards therefrom and which can be tilted with the spring. M-248.02 21. Device according to at least one of claims 1 to 20, characterized in that the spring (30) is guided so as to be laterally movable on its downward path. 22. Device according to at least one of claims 1 to 21, characterized in that in a fixed position relative to the axis (15) or downwards in an angle of inclination (w) translatable surfaces (41) of sections of at least one by a distance beside the movement path of the or similar ves-geesfcsrä2 axis (38__) drfciibareri F^rpers (40,) is formed. 23. Device according to claim 1 or 22, characterized by a mallet (40) having a cross-section with several partial circles, the circumference (41) of which offers axially parallel surfaces inclined to the axial radius. 24. Device according to claim 23, characterized in that the roller (40) has a circumferential groove (44) through which the movement path of the stripping pin (20) or the like is laid approximately tangentially. 25. Device according to claim 22 or 23, characterized in that two disc-shaped roller elements (40) with aligned initial contours are fixed at a distance (e) from one another on the axis (38 _fl ) and the movement path of the break-out pin (20) or the like runs between them. 26. Device according to claim 23 or 25, characterized in that a force accumulator (42) generating a restoring force is arranged between the stripping surface (15) and the roller (40 _a ).