DE1128399B - Device for trimming sheets, in particular paper sheets - Google Patents

Description

The invention relates to a device for trimming sheets, in particular sheets of paper, to remove the areas outside of one or more areas printed by blueprints lying cut edges.

As is well known, blueprints are generally produced on paper with complete edges are irregular. Preferably, such pauses should be in such a way after the cut edges have been cut off Way to be delivered that the paper format is pretty much the format of the light-paused field plus an edge of a fixed width.

Incidentally, it is quite often necessary to reproduce the same original several times or to trace multiple originals of different widths on the same tracing paper web. It is true that the individual deductions in this case follow one another in the direction of the path, but it is generally the case impossible to orient and / or align all these originals in the same way. In The practice never succeeds in using the original or the originals used on consecutive breaks be introduced or reintroduced into the pausing machine in exactly the same position.

The entirety of the sides of the fields lying in the vicinity of one edge of the paper web therefore mostly form a broken line that has to be cut off in a discontinuous manner. Fig. 1 shows, on a reduced scale, an example of such a path obtained during pause.

Furthermore, it is sometimes necessary to trim certain blueprints, the length of which is a multiple of 10 m. This applies in the case of "profiles" (e.g. ship hulls, railway lines, electrical views Line plans, etc.). It should also be noted that as a result of a slow lateral Relocation of the breaks in general because of the always imperfect stop in the pause machine assume a position similar to that shown in FIG. 2 on the web.

The trimming has so far been carried out by hand in a discontinuous manner. It is obvious that such a way of working is very tedious, because it has to be carried out repeatedly of the following work cycle: There must be a part of this bulky paper web whose Length is considerable, can be spread out using a ruler or cutting tool Cut are performed without changing the position of the paper web and the ruler, and the any paper cutting strips on the sides must have a device for trimming leaves, in particular of paper sheets

Applicant:
Lucienne Joannes, née Fournier, Paris

Representative: Dr. W. Koch, Hamburg 4,

and Dr.-Ing. R. Glawe,
Munich 27, Guvilliesstr. 16, patent attorneys

Claimed priority:
France of April 30, 1959 (No. 793 651)

Lucienne Joannes, née Fournier, Paris,
has been named as the inventor

removed. As a result of the repeated rescheduling, the cut naturally falls more or less unevenly.

Whether the cutting tool is one with a cutting tool that moves transversely to the cutting path Knife or a cutting tool carried by a laterally displaceable carriage, the cut is only made along one side of the light-paused field at a time, and it is generally impossible to cut the cutting strips on either side of this field.

With all of these machines, of course, the operator tires very quickly because of the handling the heavy rulers or the operation of the cutting tools and the turning of the blades when transitioning to the cuts in the transverse direction after making the longitudinal cuts.

In the wallpaper roll industry there are longitudinal cutting machines for continuous operation known. In these, the web removed from a roll of great width is made by means of rolls or Rollers with knurled surface or made of rubber conveyed and means in the transverse direction in the same Spaced knives cut into rolls of smaller width. The ones that occur with blueprints However, there are no difficulties with these machines. Rather, the downside is one There is no risk of skewing as shown in FIG. 2, since the delivery roller is below the conveying direction is at right angles and the paper, as soon as it is gripped between the conveyor rollers, from these

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inevitably, without the need arises, the paper from the grip of these rollers to correct a lateral deviation. Also there is the clipping of mutually parallel and adjacent tracks in such a way that not only are the disruptive influences small, but they even balance each other out. Also be the widths of the paper wallpaper at the time of printing cut up so that forced accuracy is not required.

The invention eliminates the difficulties associated with the known machines are connected, and allows cutting off a cut edge of of any length with previously unknown regularity and simplicity and without consideration whether the cutting line is a straight line, a curve or a broken line.

The invention also makes it possible to have both cutting edges on both sides of the traced field at the same time to cut off.

In the device according to the invention, they are arranged in a manner known per se behind a work table Feed devices for the paper with at least one device for longitudinal cutting of the paper conveyed by the rolls combined, with these feed members the paper enough clamp vigorously to generate its feed.

It is characterized in that the sheet for trimming along a pre-drawn edge can be oriented and set up by the sliding of the paper in the feed devices thereby is made possible that these from a pair on top of each other There are arranged rollers, the lower one is driven and the upper one with play on their Axis runs freely and presses with such a predetermined force on the lower roller that the sliding of the paper is made possible.

In Fig. 3 to 7, an embodiment of the invention is shown, for example, while a Discussion of FIGS. 1 and 2 is already included in the introduction to the description.

Fig. 3 shows in perspective and with parts broken away, the overall construction of a cutting machine according to the invention.

Fig. 4 is a main section through the fixed slitters on the right-hand side of FIG. 3.

Fig. 5 is a corresponding section through the movable cutting tools, which in the middle part in Fig. 3 lie.

Fig. 6 is a view, partly in longitudinal section, taken along the line VII-VII in Fig. 4 for illustrative purposes the mutual arrangement of the transverse and longitudinal cutting devices.

Fig. 7 shows in a perspective illustration and in schematically drawn sections, the profile of the Area of deflection of the cut edges or cut waste of the paper.

In Fig. 3 the cutting machine is shown, which is equipped with a light metal construction with two side walls 1 and 2 which are connected to one another by means of tubes 3. These serve on the one hand to form a rigid transverse reinforcement between the cheeks 1 and 2 in conjunction with a work table to be described below and on the other hand to form slideways on which a sliding carriage C can slide in the direction of the arrows F1 and F2 .

This carriage C consists of a vertical plate 4 which is equipped with guide collars 5 that slide on the parallel tubes 3. The carriage can be displaced along a rack 6 by means of a manual drive system mounted on the plate 4. This system consists of a gearwheel Ί which can be driven via a shaft 8 by means of a handwheel 9. Since the shaft 8 is mounted in bearing blocks 10, which are made in one piece with the plate 4

ίο exist or are permanently attached to it, moves this wave when rolling the gear 7 on the rack 6 in the lateral direction.

At the front of the cutting machine two parallel shafts 11 and 12 are also arranged, the are carried out through the plate 4 at a distance from one another. These waves are on top of each other and in with respect to the horizontal plane P, in which the upper Surface of the work table 13 is arranged symmetrically on both sides. The two waves are with same speed in the opposite sense (arrows / 1 and / 2) from a motor 14 via a Drive 15 for intersecting axes and a gear drive 16 driven.

The mode of operation of the cutting machine when cutting lengthways is essentially as follows:

The paper web 17 to be trimmed (FIG. 6) is placed on the work table 13 and advanced in the direction of arrow F3 (FIG. 6). On the cheek 2 and the plate 4 are, evenly cutting with the directed inner surfaces 18 and 19 of the same, provided knives, which are connected to feed devices for the paper and will be described in detail below. In this way the paper is drawn inward by the feed devices, trimmed by the knives and guided between the directed inner surfaces of the cheek 2 and the plate 4, while the lateral cut edges on both sides thereof are eliminated.

The shafts 11 and 12 are with their right ends in flanged bearing housings 20 and 21 (Fig. 4) worn, which are equipped with ball bearings 22. Corresponding bearing housings 20 and 21 carry the left ends of these waves on the side of the cheek 1 that is not visible in the figure.

The knife system known to those skilled in the art is self-sharpening. On the flange 25 a means a screw 27 attached to the shaft 11 so that it rotates with it is a cup-shaped sleeve by means of screws 24 Knife 23 attached. The lower edge of this cup-shaped knife works at a height of about 1 to 2 mm with an identical cup-shaped knife mounted elastically on a cylinder 29 28 ^ ε ^ 8ί8ϋΜείί6ηα together, with the cylinder 29 is secured on the shaft 12 by means of a screw 30.

In addition, a cylinder 31 is mounted with a certain clearance / on the sleeve 26, its outer diameter is equal to the diameter of the cylinder 29. Under these conditions, the cylinder is at rest 31 on the cylinder 29, and their common generatrix 32 lies in the plane P of the upper surface of the work table 13 at the same distance from the axes of the Wellenil and 12. The cylinder31 is on the sleeve 26 by means of a screw 27 attached collar 33 attached with play.

The paper web 17 (Fig. 6) is in this way of the cylinder 29 (Fig. 4), which is in the sense of Arrow / 1 (Fig. 1) rotates, taken as soon as the

Paper web is introduced under the cylinder 31. The latter practically only has the function a free pressing device for the paper, which is produced by the cylinder 29 or the paper 17 by circumferential friction is taken. The shaft 11, which does not drive the cylinder 31, only serves as a simple horizontal abutment, the central bore of which holds the cylinder in place and him only allowed to turn in its place.

When the paper reaches the common generating line 32, it encounters the cup-shaped knives 23 and 28, the ground edges of which are presented to the paper in a manner similar to the cutting edges of open scissors facing it, as shown in broken lines in FIG. The paper is thus cut in the longitudinal direction, as if it were being pulled forward on both sides of the half-open cutting edges, and the cutting edges separate so that one is above the knife 28 and the other is below the knife 23. The rotating movement of the cup-shaped knife also makes it easier to take the paper with you in the cutting zone. In reality, of course, the paper is not drawn forward on both sides of the cutting zone A, but only on one side, namely along the generatrix 32. The effect is the same, however, because on the one hand the tensile force is exerted on the paper in an area that reaches up to a few millimeters from the cutting zone A , and on the other hand the relatively long generatrix 32 gives the paper sufficient rigidity so that the one-sided tensile effect sufficient.

The cutting plane of the cup-shaped knives 23 and 28 is, as can be seen, exactly in the plane of the directed inner surface of the cheek 2.

This is achieved in that the cup-shaped knife 23 to within the thickness of the cheek 2 in a circular window 34 is sunk, the diameter of which is slightly larger than that of the knife.

Since, by the way, the cut edge of the paper to the right of the cutting plane 19 is to be removed, care must be taken to avoid causing this cut edge, whose rigidity should not be underestimated (especially if it rolls up into a spiral), too quickly is to move away from the cutting plane, as otherwise the paper runs the risk of tearing immediately before it reaches zone A and, on the other hand, the tensions developed in front of this zone could cause the paper to deflect from the direction of movement communicated to it.

For this reason, the cheek 2 is provided with a cutout 35 (FIG. 7) in which the cut edges of the paper are both guided strictly in the plane 19 with only a slight mutual vertical displacement. So when the field provided with a blueprint approaches the plane 19 after the perfect cut, the cut edge arrives in a recessed area 36 of such a type that in a zone 37 the thickness of the cheek 2 is several centimeters practically zero. Further back, the thickness increases markedly in the direction of arrow F 3 of the passage of the paper, starting from a zone 38. It can thus be said that the cutting edge of the paper, which sinks to the side, practically its rigidity in the horizontal plane loses and no longer harbors the risk of deflecting the paper to be trimmed from its correct direction of movement. In addition, an inclined transverse finger, not shown, can be provided on the cheek 2, which promotes the lowering of the cutting strip t of the paper indicated by the arrow F 4 (FIGS. 6 and 7).

Practically the same equipment is provided on the carriage C in a symmetrical arrangement. There, too, is a cup-shaped knife 39 (FIG. 5) on the flange 40 of a sleeve 41 and a second one elastic cup-shaped knife 42 mounted on a cylinder 43, while a cylinder 44 the Forms roller for pressing the paper. The general manner of assembly inside the plate 4 is approximate the same as with the cheek 2. Here, too, are a window 45 for inserting the cup-shaped Knife 39 and an obliquely delimited area 46 for the detachment of the cut paper edge provided on the left. An adjusting ring 47 provided as an abutment limits in conjunction with an intermediate adjusting ring 48 the lateral play of the cylinder 44 on its sleeve 41.

The main differences in the mode of operation are that the plate 4 in the sense of Arrows Fl and F 2 is movable, while the cheek 2 is certain.

The driving of the sleeve 41 during rotation takes place with the aid of a driver 49, which with an in the shaft 11 machined groove 50 cooperates, and in the same way the driving of the cylinder takes place 43 by means of a driver 51 engaging in a groove 52 in the shaft 12.

Flanged bearings 53 and 54 attached to the vertical plate 4 by means of screws 55 form in unison with collars 56 and 57, which are mounted on extensions 58 and 59 of the sleeves 41 and 43, one bilateral connection of the latter with respect to the mobile plate 4, allowing the rotation of the both sleeves.

With the help of these two assembly sets, the lengthwise cutting of a paper web or sheet is possible to a width allows the distance between the directed flat surfaces 18 and 19 from each other is equivalent to.

It is therefore sufficient to guide the sheet or the web under the pressure rollers 31 and 44 and an automatic one Allowing the paper to unroll while just being careful to keep its orientation is maintained.

It can be seen that, since the sheet or the track with the entrainment organs is not immovable Way is connected, but is freely movable in its plane, the operator full freedom has to correct any undesired deflection of the paper web or sheet. However that is Attack on the paper along the generators 32 and 60 is strong enough to ensure that it is carried along, on the other hand, loose enough to allow shifting or shifting.

This is of particular importance, because when the rollers 31 and 41 through from the shaft 11 inevitably axially fixed knurling rollers were replaced, the operator would not be in the Position, the orientation of the paper passing through, be it during the loading or during the Traversing the paper to correct. Consequently, any flawed attack would be so small the flaw also be, or any disturbance in the course of the cutting

dens lead to a constantly growing error, because in order to clear the sheet or the path, you would have to let it run through to the end. It must be noted at this point that this The disadvantage is also significant if the cut is only made on one side, as the entrainment the pressure roller, even if only one is provided, never only in one point of contact occurs, but always along a line, so that a pivoting of the paper in its plane Resistance is opposed.

The motor 14 is preferably controllable by means of a pedal-operated resistor, and this is permitted changing the speed while loading the paper or at any moment, in which an irregularity occurs. So has z. B. the operator an interest in the Insert the web at reduced speed or the layer at reduced speed to correct the paper between the attacking rollers by shifting ao sideways, while the Increase speed once the blade has taken its correct direction. The experience teaches that most of the usual irregularities or disturbances appear only after the sheet has been inserted occur, are so insignificant that the operator can use them even at high speeds is able to correct.

The cutting zone A is hidden from the operator's view through the cutting tools themselves, so that it is somewhat difficult to observe the proper passage of the paper through this zone.

This disadvantage is eliminated by marking. Such a marking can be in the form a longitudinal line 61 (FIG. 3) can be realized on a, for example, transparent ruler 62 is drawn, under which the paper passes. The longitudinal lines on the ones to be trimmed Plans always have to move in their correct direction, i.e. while they are being cut remain immovable in the transverse direction. So it is extremely easy for the operator to collapse the line drawn on the paper during the passage of the paper with the line 61 on the ruler to be determined and monitored. This, in turn, enables the use of very high levels Cutting speeds, and it is generally sufficient only to lightly tap the paper with the Finger to align the line that runs under the mark on the ruler with the To bring a mark if it deviates from this.

The mark 61 is located exactly in the cutting plane 19, that is to say in the plane in which the field carrying the blueprint is to be cut off without an edge. Otherwise, the mark is shifted to the left by the width of the prescribed margin. It can be seen that when the operator shifts the paper in one direction or the other, the center of the pivoting movement is on one of the generators 32 or 60. The displacement in the vicinity of zone, A is therefore significantly less. From this it is readily apparent that the correction of undesired deviations can be carried out with ease, without the danger of a deviation being corrected by an overly significant opposite deviation.

The ruler 62 can also have a division

63, the zero point of which lies in plane 19. So as soon as the sheet or the web is under the transparent ruler 62 is inserted, the width is easy to read off by which the movable plate 4 of the cheek 2 must be removed in order to bring about the trimming in the desired manner.

Finally, the slide C can be moved to the correct width using a metal tape measure

64, the one from right to left has ongoing division and on the mobile plate 4 is fixed in such a way that its origin is exactly in the plane 18 and that in the Inside a housing 65 attached to the flank 2 to the right of the plane 19 automatically up and down is unrollable. By the way, you can use a standard roll-up metal tape measure.

The operation is as follows: The operator guides the paper under the rollers 31 and 44 while the machine is running slowly in such a way that the straight cutting line b (FIG. 1) coincides with the marking 61 on the ruler. A simple reading on the ruler 62 simultaneously gives the cutting width between the traced lines b and c (FIG. 1), and an actuation of the handwheel 9 and subsequent reading on the metal measuring tape 64 indicates the suitable distance between the directed planes 18 and 19.

The operator now only needs to increase the feed rate and to watch that the line b remains in line with the marking 61 during the passage.

The cut edge of the paper in front of the line α is in turn taken along and in the run the subsequent manipulations ejected without the operator having to deal with it needs.

It should be noted that the worktable extends to the right beyond the cheek 2 in a cantilevered manner is. It must be taken into account that during the cutting of a paper web like after 2, the right cutting edge can have an appreciable width and therefore below the ruler 62 Space must be provided for its passage.

Arranged on the table is a profile with an incorrect V-shaped cross-section 99 (FIG. 6), which causes the paper to assume a curved course and thereby acquire a certain rigidity in the transverse direction, whereby the insertion of the paper under the ruler 62 facilitates will. The top of the cutting device is closed by a hinged lid 100 .

Claims (4)

PATENT CLAIMS: 1. Apparatus for trimming leaves, in particular sheets of paper, with feed devices for the paper arranged behind a work table, which are combined in a manner known per se with at least one device for longitudinal cutting of the paper conveyed by the rolls, these feeding devices sufficiently forceful the paper clamp in order to generate its feed, characterized in that the sheet can be oriented and set up for trimming along a pre-drawn edge, in that the sliding of the paper in the feed devices is made possible by the fact that the latter consists of a pair of rollers arranged one above the other. zen exist, the lower one is driven and the upper one runs freely with play on its axis and presses on the lower roller with such a predetermined force that the sliding of the Paper is made possible. 2. Apparatus according to claim 1, characterized in that the cutting edge of the cutting device arranged as close as possible to the feed device and the cutting device is formed by two self-grinding cutting discs. 3. Apparatus according to claim 1 and 2, characterized in that before the with a feed 10 pair of rollers combined cutting knife set with a guide mark provided for Setting the edge to be trimmed is arranged. 4. Apparatus according to claim 1 to 3, characterized in that two cutting devices arranged on axes located transversely to the conveying direction of the sheet to be trimmed are that one cutting knife set is adjustable to the other. Considered publications:
German patent specification No. 281073. For this purpose 2 sheets of drawings