EP0967057A2 - Apparatus for cutting piled sheets - Google Patents

Abstract

The cutter has a two-part table to hold the material before and after cutting, and a side stop (22) movable at right angles to the cutting plane (15) of the knife (9) against a return force, which is active in direction of the cutting plane. The side stop is positioned near the knife, relative to its lower dead center. On this side, the stop has an end section, which is positioned relative to the wedge shape of the knife or the knife support (8), or at an acute angle to the cutting plane. The side stop is located on the table (3), a stand (2), or a portal frame (4) of the appliance.

Description

The invention relates to a device for cutting stacked, leafy crop, with a table to hold the Good, with a back part of the table the material to be cut and a front table part receives the cut material, further with a knife arranged above the table for cutting the Good, a press bar that can be lowered onto the material to be cut, a feed device arranged in the area of the rear table part to move the goods in the direction of the Knife and one arranged in the area of the front part of the table movable side stop for the lateral contact of the cut good, the knife being a wedge-shaped edge and is moved in a pulling cut through the goods, as well as the side stop on the pulling direction of the knife leading side of the table is arranged.

Such a cutting machine for cutting leafy material in the form of paper, cardboard, foil or the like, is from the DE 295 09 797 U1 known. This has a front and a rear part of the table, which can be pulled apart to form a gap are. Through the gap is at an edge or Intermediate cut discarded waste.

In such a cutting machine, after pressing the cutting good by means of the press bar the knife in pulling cut through the material to be cut until it is in its bottom dead center into the cutting bar embedded in the table penetrates. The knife moves with the pulling cut not just vertically towards the cutting bar, but it also has a horizontal component of motion in the direction of Side stop on. This has the consequence that towards this horizontal movement component a force on the material to be cut is exercised, with which it is firmly pressed against the side stop becomes. So that the cut on the front part of the table Do not stack when moving the front part of the table Side stop is moved, this is in a stationary Component of the cutting machine movably supported. Before the The side stop is opened when the front part of the table is opened moved its stop position to the stack of cut goods and only after the front part of the table has been closed again Stop position moved. The side stop is special perpendicular to its stop surface or parallel to its stop surface, with one component up, movable or swivels to the side.

Regardless of this, the wedge-shaped formation of the Cutting edge and the knife holder receiving the knife that the cutting material stack generated during cutting, in the direction of Cutting edge of the knife seen, parallelogram in itself is moved and then manually using a Utility angle, is converted back into its cuboid shape.

In practice, with such cutting machines too generates small-sized stacks that are, for example, a width of less than 25 mm. While larger stacks Strength is ensured that this, despite the pulling Cut the cutting knife, put it against the side stop, there is a risk with stacks of low strength that they Cut between the knife or knife holder and the latter facing end of the side stop can be clamped. The clamping is when lifting the knife or knife holder canceled again, yet the quality of the cut goods significantly reduced as a result of the crushing. This can go so far that the material to be cut is unusable. The Pinching also has the disadvantage that the Cutting process is disrupted because the machine operator crushed stack of cuttings manually from the ongoing cutting process must remove. This is particularly the case with stacks of cut goods low strength associated with considerable effort, whereby it cannot be ruled out that when handling the damaged stacks moved other already cut stacks become. This also causes a disturbance of the Cutting process. - Apart from that, they can be crushed of the material to be cut between the knife or knife holder and Side ruler forces cause the side stop is damaged, in particular is bent or breaks. The bent side stop does not guarantee an exact, vertical alignment of the side surfaces of the material to be cut Table surface. A broken side stop must be replaced become. This disrupts the cutting process or the function of the Machine itself considerably.

It is an object of the present invention to provide a device type mentioned in such a way that with this Thick material to be cut - in relation to the feed direction of the goods - cut reliably without disrupting the cutting process can be.

The object of a device of the type mentioned is solved Kind in that the side stop perpendicular to the cutting plane of the knife against an effective one in the direction of the cutting plane Restoring force is movable.

As a result of the movable mounting of the side stop this under the influence of the deforming during the cut Give up the material to be cut, d. H. move away from the knife like this that the cutting material stack is not between the side stop and the knife or knife holder is squeezed. The knife or rather the knife carrier acts on the stack of material to be cut one, converts it into the parallelogram form, whereby, due to the pulling cut of the knife that the knife or side of the stack facing away from the knife carrier to the end face of the side stop and this according to the kinematic Specifications of the knife or knife holder from the Cutting plane moves away. This is done with low forces, which ensure that the material to be cut is not crushed. When lifting the knife or knife holder, there is no need for it Action on the stack of material to be cut, so that the side stop under the action of the restoring force in its starting position in Is shifted in the direction of the knife plane and thereby the Slightly erect stack of material to be cut. The real one Alignment of the material to be cut is usually done with the knife raised by the operator using a The stack of cut goods e.g. on the good to be cut aligns, which is pressed by the press beam.

The side stop is preferably in the immediate vicinity of the Knife, based on the bottom dead center of the knife. This makes it possible to cut material of particularly low thickness cut, d. H. one with a thickness below 25 mm lies.

The side stop expediently points towards the knife facing side, related to the bottom dead center of the knife, an end section facing the knife, which accordingly the wedge shape of the knife or the wedge shape of the knife holder arranged at an acute angle to the cutting plane is. This design of the side facing the side stop takes into account the parallelogram shape resulting from the cut of the material to be cut and allows the side stop to be placed as close as possible to the cutting plane.

The side stop can on any stationary components of the Device be attached. For example, if a stationary Table is used on this, otherwise, in particular when forming a movable front table part on which Stand of the machine or the portal frame. The attachment can on these components directly or indirectly.

According to a preferred embodiment it is provided that the Side stop is plate-shaped. He builds with it quite narrow, with a plate surface of the side of the Material to be cut. The diametrical side surface can then Form management function for a stationary bearing element, the is preferably also designed as a plate. The bearing element, that slidably receives the side stop is expediently fixed with the table, the stand or the portal frame connected.

According to a particular embodiment of the invention provided that the side stop against spring force in Bearing element is stored. Here you will find one or use of several compression or tension springs, in particular spiral springs, which attack the side stop and the bearing element. A particularly simple and practical guidance of the side stop relative to the bearing element, there are several for this Bolt-slot arrangements are provided. So he can plate-shaped side stop can be provided with several bolts, which engage in elongated holes in the plate-shaped bearing element. The arrangement of the bolts on the side stop has the advantage that the area serving the cutting material Elongated holes is interrupted, which is a precise system and Guiding the material to be cut at the side stop would be a hindrance.

Further features of the invention are in the description of the Figures and shown in the figures themselves, being noted is that all individual characteristics and combinations of individual characteristics are essential to the invention.

Figur 1

eine Vorderansicht der erfindungsgemäßen Vorrichtung,

Figur 2

einen vertikalen Schnitt durch die Vorrichtung gemäß der Linie A-A in Figur 1,

Figur 3

einen horizontalen Schnitt durch die Vorrichtung gemäß der Linie B-B in Figur 2,

Figur 4

den in Figur 2 mit strichpunktiertem Kreis veranschaulichten Bereich des Seitenanschlages, bei abgesenktem Messer, ohne Schneidgut und

Figur 5

eine Seitenansicht gemäß Figur 4, veranschaulicht nach dem Trennen eines Schneidgutstapels geringer Stärke.

In the figures, the invention is illustrated using an exemplary embodiment, without being limited to this. It shows in a simplified representation:

Figure 1

2 shows a front view of the device according to the invention,

Figure 2

2 shows a vertical section through the device along the line AA in FIG. 1,

Figure 3

3 shows a horizontal section through the device along line BB in FIG. 2,

Figure 4

the region of the side stop illustrated with a dash-dotted circle in FIG. 2, with the knife lowered, without cutting material and

Figure 5

a side view according to Figure 4, illustrated after separating a stack of small thickness.

The cutting machine 1 has a stand 2, one of the stand 2 worn table 3 as well as one above the table extending portal frame 4. A rear part 5 of the Table 3 is used to hold the goods to be cut and one front part 6 of the table 3 receiving the cut Good. The table surface on which the individual stack of sheets rest, is designated by the reference number 7.

A press bar, not shown, is mounted in the portal frame 4, which is placed above the rear table part 5 and on the material to be cut can be lowered. In front of the press beam Portal frame 4 a knife carrier 8 movably mounted with a cutting knife 9 is screwed to its lower end. The lower ends of the cutting knife 9 and knife carrier 8 are wedge-shaped, the rear part of the table facing sections 10 and 11 of knife carrier 8 and cutting knife 9 in a plane perpendicular to the table surface 7 extend. The wedge shape of the cutting knife 9 and knife holder 8 is by further sections 12 on the knife 11 and 13 on the knife carrier 8 formed at an acute angle to the sections 11 on the cutting knife 9 and 10 on the knife carrier 8 are positioned. Below the knife 9 is in the table 3 a cutting bar 14 embedded, in which the knife 9 in the bottom dead center to ensure that also the bottom layer of the stack of sheets, made of paper, Cardboard, film or the like is cut. The Cutting plane in which the material to be cut is cut is in the Figures denoted by the reference number 15.

Not shown in the figures is in the range of rear table part 5 arranged feed saddle for moving of the material to be cut in the direction of the cutting plane.

The knife carrier 8 is mounted in the portal frame 4 such that the knife 9 in its downward movement in a pulling Cut through the stack of sheets. For this is the Knife holder 8 on both sides of the knife 9 with respect to the portal frame 4 can be swiveled as well as moved in a straight line stored. In the area of the respective side of the knife carrier 8 it is provided with a groove 16 which is a sliding block 17th enforced. This is provided with a pin 18 which is pivotally mounted in the portal frame 4. Related to the The machine operator is in the right-hand area the machine a generally designated by the reference number 19 Drive provided with a crank, which swivels a crank rod 20 picks up the swiveling in the right area of the knife holder attacks. As can be seen from the illustration in FIG the knife 9 in its top dead center with its cutting edge 21 not arranged parallel to the table surface 7, and the the right area of the cutting knife 9 is deeper than the left Area of the cutting knife 9 positioned.

In the right area of the front table part 6, thus the Crank drive 19 facing area of the front table part 6, is a side stop 22 near the cutting knife 9 appropriate. This is designed as a movable plate is arranged next to the table 3, at a short distance this, so that movement of the stop plate 22 relative to rear table part 5 is guaranteed. The stop plate 22 stands by a measure that is slightly higher than the maximum Insert height of the material to be cut, beyond the table surface 7. The stop plate 22 is also mounted in a plate shape trained bearing element 23, which on its Side stop 23 opposite side with a flange shoulder 24 is provided, which is screwed to the portal frame 4. The plate-shaped bearing element 23 is perpendicular to three Cutting plane 15 extending slots 25 provided in the in each case a bolt 26 connected to the stop plate 22 intervenes. A helical compression spring 27 engages parallel to Longitudinal extension of the elongated holes 25 on the stop plate 22 and the bearing element 23 so that they stop plate 22 in Direction of the cutting knife 9 depressed, the travel of the Stop plate 22 through the contact of the respective bolt 26 the end of the respective elongated hole facing the cutting knife 9 25 is limited. The displacement path of the stop plate 22 is accordingly away from the cutting knife 9 by the other End of the respective elongated hole 25 limited.

The stop plate 22 and the plate-shaped bearing element 23 are essentially identical in shape. The top and bottom and the side of these parts facing away from the knife 9 parallel to the table surface or parallel to the cutting plane 15 aligned. The knife 9 or the knife carrier 8 facing Side of the parts, however, has a short, lower one Section that runs parallel to the cutting plane 15 and from starting from there an inclined away from the cutting plane 15 Section 28, which is at an acute angle to the cutting plane 15th runs, which corresponds approximately to the angle that when cutting the material, its parallelogram-shaped displacement due to the action of knife 9 and knife holder 8 corresponds.

Figure 4 shows the process of cutting without cutting. The cutting knife 9 is at the bottom dead center. Between the knife carrier 8 and the section 28 of the stop plate 22 remains a small gap, so that the stop plate 22 is not moved with respect to the bearing element 23. If material of great thickness is cut from the remaining stack, with which the material to be cut is already on the side of the cut Stop plate 22 abuts, stop plate 22 remains in the position shown in Figure 4, since the acting on it lateral forces due to the pulling cut of the Knife for no relative displacement of the stop plate 22 and Guide bearing element 23. However, if a stack of cut goods 29 low strength, as shown in Figure 5, from the remaining stack 30 cut off, which is therefore not before the cut on the Stop plate 22 rests, although the pulling cut causes that the cut stack of cut 29 is slightly in the area between the stop plate 22 and knife 9 and Knife holder 8 moves. The deformation of the stack of cut items 29 in the sense of the parallelogram form, as illustrated in FIG. 5, the stop plate 22 can evade, however, since they are in this case relative to the bearing element 23 against the force of Spring 27 moves. Immediately after the lifting movement of the Knife 9 is initiated and therefore no longer on the cut cut stack 29 acts, presses the spring 27 the stop plate 22 back to its starting position. Of the Cutting material stack 29 is at the decline of the knife 9 and Knife holder 8 due to the evasive movement of the stop plate 22 has not been squeezed.

Claims (9)

Device for cutting stacked, leafy goods, with a table for receiving the goods, a rear table part receiving the goods to be cut and a front table part receiving the cut goods, further with a knife arranged above the table for cutting the goods, one on the Press bar that can be lowered, a feed device arranged in the area of the rear table part for moving the goods in the direction of the knife, and a movable side stop arranged in the area of the front table part for lateral abutment of the cut goods, the knife having a wedge-shaped cutting edge and in the pulling direction Section through the material is moved, and the side stop is arranged on the side of the table leading in the direction of pull of the knife, characterized in that the side stop (22) perpendicular to the cutting plane (15) of the knife (9) against one in the direction of the cutting plane ( 15) effective restoring force is mobile. Device according to claim 1, characterized in that the side stop (22) is arranged in the vicinity of the knife (9) with respect to the bottom dead center of the knife (9). Apparatus according to claim 1 or 2, characterized in that the side stop (22) on its side facing the knife (9), relative to the bottom dead center of the knife (9), has an end section (28) facing the knife (9), which is arranged in accordance with the wedge shape of the knife (9) or the wedge shape of the knife holder (8) receiving the knife or at an acute angle to the cutting plane (15). Device according to one of claims 1 to 3, characterized in that the side stop (22) in the table (3) or a stand (2) or a portal frame (4) of the device is mounted directly or indirectly. Device according to one of claims 1 to 4, characterized in that the side stop (22) is plate-shaped. Device according to one of claims 1 to 5, characterized in that the side stop (22) is slidably mounted in a bearing element (23) which is fixedly connected to the table (3), stand (2) or portal frame (4). Device according to one of claims 1 to 6, characterized in that the side stop (22) is mounted in the bearing element (23) against spring force. Apparatus according to claim 6 or 7, characterized in that the side stop (22) is held relative to the bearing element (23) in a plurality of elongated bolt guides (26, 25). Device according to one of claims 6 to 8, characterized in that the plate-shaped side stop (22) is provided with a plurality of bolts (26) which engage in elongated holes (25) of the plate-shaped bearing element (23), and at least one compression or tension spring ( 27) on the side stop (22) and the bearing element (23).

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