DE1940949A1 - Folding machine - Google Patents

Description

Mechanical engineering Oppenweiler Binder & Co., 7157 Oppenweiler near Backnang (Baden-Württemberg)

Folding machine

The invention relates to a folding machine with an alignment surface for a film-shaped material and with a forming device, the part to be folded of the material aligned on the alignment surface in the nip between Forms two press jaws adjacent to the alignment surface into a loop, which is then closed by the press jaws is pressed together in a fold.

In a machine of the above-mentioned type known under the designation "cylinder folding machine", the press jaws are mounted on a rotatably mounted cylinder roller, which cooperates with a second cylinder roller, the outer surface of which the alignment surface forms and the gripper for gripping and feeding a sheet to be folded and for Forming the loop of the sheet has a folding knife.

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The gripper and the folding knife are here in a fixed angular distance from each other, so that the fold is only for a very specific format in a specific, a constant distance from the gripper can be established. This makes the application of these known cylinder folding machines narrowly limited, so that they are practically only used for printing newspapers and the like in rotary printing presses who work from the roll and have no format change are common. The known cylinder folding machines a very complex construction.

The invention is based on the object of providing a folding machine for folding any film-shaped material, So to create for folding sheets and webs, which has the simplest possible construction and with which sheets of any format can be folded.

In the case of a folding machine, this task is the *. named type solved according to the invention in that the alignment surface has an interruption aligned with the pressure gap by means of which the part of the material to be folded can be introduced into the printing nip by the forming device is.

It is thereby achieved that, for example, any size folding table can be used as the alignment surface. Alignment strips can be provided on this folding table, which make it possible to use the film-shaped material as desired Align the format with respect to the interruption of the alignment surface in such a way that the part to be folded is immediately adjacent to the Interruption lies. Through this interruption of the alignment surface, the part to be folded of the film-shaped

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gene material through the forming device to a loop engaging in the pressure gap between the press jaws are shaped and then pressed together by the jaws. The invention makes it possible here as a molding device to provide any device that is suitable for introducing the part to be folded into the printing nip, e.g. a device for generating an air pressure which pushes the part of the material to be folded into the pressure nip presses between the jaws * This air pressure can e.g. be generated by a suction device that is placed in the pressure gap creates a negative pressure. However, a folding strip known per se can also be provided as the forming device, which briefly penetrates into the pressure gap to form the loop and is pulled out of the pressure gap before it is closed will. The use of the interrupted alignment surface also has the advantage that not only arcs are different Format, but also webs can be folded. A particular advantage of the invention is that the parts forming the alignment surface and the press jaws are Can be stored in relation to the machine frame fixed parts. This is a very simple design of the Folding machine possible according to the invention. One of the press jaws can be fixed in the machine frame and the other can be moved be stored. Both press jaws can also be mounted so as to be movable relative to the machine frame. Compared to the known sword and buckle folding machines, in which the in the folding station by means of a folding knife or loop formed by upsetting the sheet is drawn into the gap between two folding rollers and thereby the fold is formed, the folding machine according to the invention, similar to the cylinder folding machine, has an essential greater performance because here the loop is formed directly in the pressure gap between the press jaws, so that

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BATH

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the formation of the fold not as with the known. Sword- and buckle hemming machines depends on whether the loop is from the folding rollers is detected or not. Is the loop at the folding machine according to the invention once formed, then

is the smartness that extends over the entire printing gap
fe is folded securely at the same time and evenly, which is not guaranteed in the known sword and buckle folding machines, in which the loop must first be drawn into the gap between two folding rollers, because the formation of the fold is associated with an acceleration of the material to be folded, which can lead to a different rapid detection of the loop by the rollers.

In contrast, in the case of the folding machine according to the invention the loop with fixed jaws within the pressure gap are formed cleanly, so that when closing the J3ruckspaltes a flawless fold at a precisely determinable Body can be established.

But if you look at the well-known sword and buckle hemming machines, in which the loop is drawn in between the two rollers, wants to achieve a very precisely fitting fold, then you have to operate these folding machines at an operating speed which experience has shown is lower than that Operating speed of known automatic sheet feeders, so that their efficiency cannot be fully exploited. On the other hand, there is the working speed of cylinder folding machines is much larger than that of automatic sheet feeders, see above that when processing sheets, the high working speed of cylinder folding machines is not fully exploited, and thus the high construction costs of the cylinder folding machines for the processing of sheets are not exploited.

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In contrast, the operating speed of the folding machine according to the invention can be very precise and cleaner Folding can be increased so much that it increases the working speed adapted from automatic sheet feeders can be. This ensures that the folding of sheets of any format with the folding machine according to of the invention performed at optimal speed can be.

In order to make the path that the material to be folded has to make in the formation of the loop as small as possible provided in an advantageous embodiment of the invention, that one side of both jaws of the pressure gap forms interrupted part of the alignment surface. This ensures that the pressure gap is directly adjacent to the alignment surface and the loop is through a very slight curvature of the material to be folded can be formed in the printing nip. This in turn has the advantage that when using a rebate strip this only has to exert a very small stroke, which increases the working speed the machine can be increased significantly.

In a further advantageous embodiment of the invention are provided with the clamping jaws cooperating holding devices that hold the material on the clamping jaws. It is thereby achieved in a very simple manner that the material to be folded is always kept exactly, so that in unfavorable exceptional cases, an inaccuracy of the fold can be avoided with certainty, which is very important especially at very high working speeds.

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In the embodiment in which one side of both Press jaws the part of the alignment surface interrupted by the pressure gap forms, it is advantageous here if the fastener during the formation of the loop and the fold the material on the sides forming the dislodged surface hold the press jaws and the movable press jaws assigned holder for joint movement with the. Press jaws is stored. This ensures that the movement of the press jaw contributes to the formation of the loop and that

/ During the formation of the loop and during pressing of the fold firmly on the sides forming the alignment surface the jaws are held, so that a particularly accurate Determining the position of the fold is possible.

In a further advantageous embodiment of the invention is at least on the side of the nip facing away from the alignment surface for further transport of the folded material a gripper is provided, which is used to grasp the fold formed in the folds that open again after folding Pressure gap engages. As a result, the folded material can pass through the printing nip by means of the gripper after it has been folded pulled through and fed to further processing.

A particular advantage of the invention is that one with one, preferably the stationary press jaw cooperating Perforating comb can be provided, by means of which the material perforates along the fold line before folding can be. The press jaw forms the counter knife for the perforating comb, so that no special » Component is required and the construction of the folding machine is simplified even further. The perforation is

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particularly advantageous if the film-shaped material be folded several times in aufeihanderverbindidsn folding stations

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The invention is in the following description one of the Drawing of the embodiment shown in a highly schematically simplified manner a folding machine according to the invention explained in detail. ·

Show it:

1 shows a partially sectioned schematic side view of the exemplary embodiment;

Fig. 2 to 5 excerpts from Fig. 1, the 'cooperating parts of the Exemplary embodiments according to FIG. 1 in the various successive ones. Show working phases of the machine.

The embodiment shown in the drawing of Folding machine has a machine frame 1, the upper surface of which, as a folding table, forms the alignment surface 2 on which film-shaped material, e.g. sheets or webs, is aligned for folding. The alignment surface 2 is here partially formed by the upper side surfaces of two pressing jaws 3 and 4, of which the pressing jaws 3 in the machine frame 1 fixed and the press jaw 4 is mounted displaceably parallel to the alignment surface 2, as is the case with the in a bearing bore 5 of the machine frame axially displaceable

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Baren, the press jaws 4 supporting pin 6 is illustrated. The pin 6 is not shown in the drawing with a Drive connected through which the press jaws, from its position shown in Fig. 1, in which it is in a gap forming a pressure gap 7 is located from the pressing jaws 3, up to the contact with the pressing jaws, 3 and back again is movable.

Above the dislodged surface 2 are fasteners 8 and 9 and as a Formr device for forming a loop a folding bar 11 and facing away from the alignment surface At least one gripper 12 is provided on the side of the pressure gap 7. Both retainers 8 and 9 are thus above the alignment surface 2 arranged that they cooperate with a press jaw 3 and 4, respectively. The bearing 13 of the movable press jaw 4 assigned Retainer 9 is firmly connected to the press jaw 4 » bind so that it joins the movement of the press jaw 4.

In addition to the fixed jaw 3, a conveyor '14 is provided, which the material to be folded, for example individual sheets 15, on the alignment surface 2, where these sheets 15 e.g. by means of adjustable, in the Drawing alignment strips, not shown, are aligned with respect to the printing gap 7 so that the in the printing gap 7 formed fold lies exactly in the desired place.

For the clamps 8 and 9, the rebate strip 11 and the gripper 12 these drives are provided which move up and down and are not shown in the drawing. These drives are coupled with one another and with the drive of the press jaw 4 in the manner described in detail below. A single drive can therefore also be provided, of which the movements of the individual parts are known Way are derived.

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The following is the sequence of movements of the various Parts described together with the operation of the folding machine.

After a sheet 15 is aligned on the alignment surface 2 is, as shown in Fig. 2, the retainer 9 and the folding bar 11 move downwards at the same time, the retainer 9 pressing the sheet 15 against the pressing jaws 4 before the sheet 15 comes into contact with the folding bar 11 will. Immediately thereafter, the folding bar 11 moves into the pressure nip 7 and presses into it the printing nip is a loop of the sheet 15, as shown in FIG. Here is the one above the press jaw 4 located arch part by the movement of the press jaw 4 participating in the retainer 9 on the press jaw held while the arch part located above the press jaws 3 moves towards the pressure gap 7. While The retainer 8 moves after the formation of the loop

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down and clamps the sheet 15 on the jaw 3 at the moment when the rebate bar 11 is the deepest. Point within the pressure gap 7 has reached. At this moment the rebate strip 11 immediately begins its return movement in its starting position and at the same time the movable jaw 4 begins its closing movement and pushes in its closed position, the loop formed by the sheet 15 between the press jaws 3 and 4 to form a fold (FIG. 4).

Immediately afterwards the press jaw moves back and the

.Greifer 12 begins its ~ ^, -, «« ·, / upward movement, so that it engages in this immediately after opening the pressure gap 7 and grips the fold just formed. As soon as this has been done, the holders 8 and 9 both lift together from the alignment surface 2 and release the sheet 15 so that the downward movement of the gripper 12 can now begin, in which the sheet 15 through the printing gap 7 from the alignment -

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area 2 is drawn. The folding process is now complete. In its lowest position shown in FIG The gripper 12 then opens and releases the folded sheet so that it cannot be replaced by one in the drawing further transport device shown can be removed.

In a modified embodiment, both clamps 8 and 9 clamp the sheet 15 on the press jaws 3 and 4 at the same time. As soon as the sheet 15 is clamped firmly on the press jaws 3 and 4, the sheet 15 is touched by the folding bar 11 moving downwards. Simultaneously with the contact of the sheet 15 from the folding bar 11, the press jaw 4 is moved in the direction of the press jaw 3 to close the pressure gap 7. The speed of movement of the folding bar 11 and the movable press jaw 4 are coordinated with one another in such a way that the part of the material to be folded always remains taut while the loop is being formed. Even before the press jaws 4 abuts ax thin folding strip 11, it is quickly drawn out from the printing nip 7 so that then immediately thereafter, the fixed of the fixed holders loop can be finally pressed at exactly the reserved ψ voted position into a fold. With this control of the holding fixtures, the sheet 15 to be folded does not perform any sliding movement during the loop formation by the folding bar 11, which precludes the dreaded blurring of the printing ink, especially with freshly printed sheets.

Immediately after the formation of the fold, the press jaw 4 moves back into its starting position. At the same time with the return movement of the press jaw 4, the holders 8 and 9 also begin their return movements and so give the Sheet 15 free, so that when the press jaw 4

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the FaXz is not pulled out of the pressure gap 7 and there by the gripper 12, as described above, grasped and pulled out can be.

In another modified embodiment, instead of or a suction device is provided with the rebate strip 11 which generates a negative pressure in the pressure gap 7 that the part of the sheet 15 to be folded is drawn into the printing nip 7 to form a loop. Instead of a vacuum generator, a compressed air nozzle can be provided above the alignment surface 2, which the part to be folded presses into the pressure gap 7.

In the exemplary embodiment described above, the one side of both press jaws 3 and 4 the part of the alignment surface interrupted by the pressure gap 7 Embodiment, it is also possible to arrange the press jaws under a plate forming the Ausricntflad "" ·, which has a gap that coincides with the pressure gap. In this embodiment, the sheet at Formation of the loop by the retainers not yet clamped to the immovable plate forming the alignment surface will. But if the fold is formed, then the retainer can hold the sheet during the return movement of the or Hold the clamping jaws on the alignment surface so that the fold is not pulled up out of the printing gap will.

In the illustrated embodiment, one of the press jaws 3 is fixed in the machine frame and the other press jaws 4 mounted displaceably parallel to the alignment surface 2. It is particularly advantageous, however, to have both press jaws 3 and 4 movable in the same way, e.g. displaceable parallel to the alignment surface 2, and the bearings of the fixtures 8 and

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to be firmly connected in each case with the associated pressing jaws 3 and 4, so that the holders 8 and 9 the movement the press jaws 3 and 4 participate. This allows the exact position of the fold to be determined even better.

In a further, not shown, advantageous embodiment is on the upper side of the fixed press jaw 3 is a parallel to the pressure gap 7 extending rectangular Groove provided, which is immediately next to the rounded

fe deten upper, the pressure gap 7 facing edge of the jaw 3 runs. The edge of this groove adjacent to the pressure gap 7 forms a "with a" above the press jaw 3 arranged perforating comb cooperating cutting edge. Furthermore, in this exemplary embodiment, a Conveyor device for the sheet 15 is provided, which initially aligns the sheet on the alignment surface that the line along which the fold should run coincides with the The cutting edge of the perforation groove on the press jaw 3 covers. In this position of the sheet 15 is then a drive of the Perforating comb switched on, so that this in cooperation with the cutting edge the sheet along the line of the desired fold perforated. After perforating it will

"Then the sheet 15 in the direction of the nip 7 so far promoted until the perforation is exactly at the point at which the sheet 15 in the further activity of the folding machine is folded. In this embodiment, the cutting edge is also the perforating groove during later removal. of the sheet 15 protected from wear by the pressure nip.

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Claims (14)

- 13 claims Folding machine with an alignment surface for a film-shaped material and with a forming device that the part to be folded of the material aligned on the alignment surface in the pressure gap between two of the Alignment surface adjacent pressing jaws into a loop, which is then formed into a loop by the pressing jaws The fold is pressed together, characterized in that the alignment surface (2) is connected to the pressure gap (7) has aligned interruption through which the part of the material (15) to be folded through the forming device (11) can be introduced into the pressure gap (7). 2) folding machine according to claim 1, characterized in that the movable press jaw (4) parallel to the alignment surface (2) is movably mounted. 3) folding machine according to claim 1 or 2, characterized in that the alignment surface (2) and the press jaws (3, 4) forming parts are stored in parts that are stationary with respect to the machine frame (1). 4) Folding machine according to one of claims 1 to 3, characterized in that one side of both press jaws the 'Part of the alignment surface interrupted by the pressure gap forms. 5) Folding machine according to one of claims 1 to 4, characterized in that cooperating with the pressing jaws (3, 4) Holders (8, 9) are provided that hold the machine . Hold the material (15) on the alignment surface (2). 6) Folding machine according to claim 4 and 5, characterized in that the retainer (8, 9) during the formation of the loop and the fold the material (15) on the sides of the press jaws that form the alignment surface (3, 4) and the clamp (9) assigned to the movable press jaws (4) for a common movement is mounted with the press jaws (4). 7) folding machine according to claim 6, characterized * in that a control for the molding device is provided which causes the molding device to operate together with the start the closing movement of the press jaw becomes effective. 8) Folding machine according to one of claims 1 to 7, characterized in that for further transport of the folded Material (15) on the side of the printing gap (7) facing away from the alignment surface (2) has at least one gripper (12) is provided for grasping the formed fold in the folds that open again after folding Pressure gap (7) engages, .9) folding machine according to claim 8 and S or 6, characterized in that that a control of the movement of the gripper (12) and the retainer is provided, through which the retainer (8, 9) only release the material (15), when the gripper (12) has grasped the material (15). 10) Folding machine according to one of claims 1 to 9, characterized in that as a forming device for forming the Loop a device for generating an air pressure is provided, which is to be folded part of the material (15) presses into the pressure gap (7) between the press jaws (3, 4). 1ÜÖÖ09 / 01 11) folding machine according to claim 10, characterized in that that a suction device is provided which generates a negative pressure in the pressure gap (7). 12) Folding machine according to one of claims 1 to 11, characterized in that as a forming device for formation the loop is provided with a per se known foldable strip (11). 13) folding machine according to claim 7 and 12, characterized in that the «movement of the rebate strip is adapted to the closing movement of the movable press jaw that the part of the material to be folded remains taut while the loop is being formed. 14) Folding machine according to one of claims 1 to 13, characterized in that one with the one ,, preferably the fixed jaws (3) cooperating perforating comb is provided. 109809/0152 Blank page