DE1940949B2 - Folding machine - Google Patents

Description

The invention relates to a folding machine with a Alignment surface for a sheet-like material, which is partially formed by two press jaws, one of which at least one of the press jaws for opening and closing one that interrupts the alignment surface Pressure gap is mounted movably parallel to the alignment surface, with a forming device that allows the to

folded part of the material aligned on the alignment surface in the open printing nip into one Deformed loop, which is then pressed together to form a fold when the pressure gap is closed is, and with the clamping jaws associated retainers to hold the on both sides of the pressure gap lying parts of the material to be folded on the press jaws, as well as with a coupling device, which couples the action of the retainer with the movement of the movable press jaw.

"A folding machine of this type is available from the British Patent specification 709 804 known, which has a folding bar as a molding device and in which the Coupling device is formed by cams seated on the same shaft.

In this known folding machine, the folding bar is firmly connected to the retainer that the movable Is assigned press jaws. However, this has the consequence that the jaws are still closing the fixed holder associated with the movable press jaws for lifting the rebate strip out of the Printing gap must be lifted. As a result, when the pressure gap is closed further, the Move the sheet on the movable press jaw so that an exact fold is not guaranteed.

In order to achieve as precise a fold as possible with this known folding machine, it is possible therefore move the movable jaws only so slowly that there is friction between the movable Press jaws and the part of the arch resting on this is sufficient to the arch when Take the closing of the pressure gap with you. This known folding machine is therefore for a fast and exact folding unsuitable. The same is true to a much greater extent for a step through the German patent 87 398 known folding machine too.

Furthermore, cylinder folding machines are known which work very precisely and have a very high output. In these known cylinder folding machines, pressing jaws are provided on a rotatably mounted cylinder roller, which interact with a second cylinder roller, the outer surface of which forms the alignment surface and which has a gripper to grasp and feed a sheet to be folded and a fold to form the loop of the sheet.

S5 bar. The gripper and the rebate bar are here at a fixed angular distance from one another, so that the rebate always remains the same for a very specific format in a specific one.

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A sufficient distance from the gripper can be established can. As a result, the application of these known cylinder cutting machines is strictly limited. You can practically only when printing newspapers or the like. Are used in rotary printing machines that work from the roll and do not have to change the format. Also have the known cylinder folds a very complex construction.

The invention is based on the object of creating a folding machine which, if possible, has a simple construction a very precise folding with high Working speed allows.

In the case of a folding machine of the ArI mentioned at the outset, this object is achieved according to the invention solved, "that the coupling device is designed so that the retaining device during the closing movement of the movable press jaw, the parts of the part to be folded lying on both sides of the pressure gap Hold the material on the press jaws so that a control is provided for the molding device, which causes the forming device together with the Heninn of the closing movement of the press hook is effective, and that a device for the further transport of the folded material on the Ausridviefläche facing away from the printing nip vorec '.-' ien is. In that the coupling device -> is designed that the clamp during of the "closing movement of the movable press jaw, the parts lying on both sides of the printing gap of the material to be salted, e.g. B. an arch, hold on to the press jaws, one is in the pressure gap by holding the bow on the press jaws precisely defined loop and thus also a very precisely arranged fold formed. The jaws can do this at any speed are moved to each other, because a displacement of the sheet to be folded on the press jaws is not It must be feared, as this is caused by the clamps during the entire closing process of the printing gap is held on the jaws. The formation of the loop is always safely guaranteed, if it is only ensured by the Formein direction that the loop is into the pressure gap trains. A shaping device that prevents the bow from moving when it is closed is sufficient des. Pressure gap bulges upwards. This can be achieved in a number of ways, e.g. B. by a fixing, located directly above the pressure gap, not impairing the movement of the press jaws Fall bar or movable independently of the movement of the frame Rebate, which during the closing of the pressure gap shortly before the contact by the press jaws can be pulled out of the printing nip, or by a device for generating an air pressure, which is to be folded part of the material in the pressure gap between the press jaws presses.

A particular advantage of the invention is that, when the pressure gap is closed, the material to be folded, e.g. B. a sheet on both sides of the pressure gap, is held by the clamp firmly to the press jaws, the pressure gap can be opened relatively wide without affecting the accuracy of the fold, since even with a wide opening the material to be folded is not on any of the can move both jaws. The fact that a control is provided for the Furmeinrichtiing, which causes the forming device to be effective together with the start of the closing movement of the press jaw, ensures that a proper loop is formed in this even if the pressure gap is opened any further.

In that there is a device for the further transport of the folded material on the alignment surface facing away from the printing gap hen is, it is achieved that the folded material is removed immediately after opening the printing nip and then immediately further material can be folded, so that this also during further transport of the folded material and when feeding further material no time is lost, resulting in Achieving a high working speed contributes.

The invention thus makes it possible, with a substantial compared to the known cylinder milling machines simpler construction a high performance with approximately the same quality and accuracy of the fold to achieve, where dl ·. Folding machine according to the invention still has the advantage that it bows different formats can be folded. Compared to known knife and buckle hemming machines, in which those formed in the folding station by means of a folding blade or by upsetting a sheet The loop is drawn into the gap between two folding rollers and the fold is thereby formed is, 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 is so that the formation of the fold not as in the known sword and edging machines depends on whether the loop is caught by the rollers or not. Is the loop on the folding machine once correctly formed according to the invention, then the one extending over the entire printing nip is The loop is securely folded everywhere at the same time and evenly, which is the case with the well-known sword and buckle hemming machines in which the loop is first drawn into the gap between two folding rollers must be, is not guaranteed, because with the fold formation at the same time an acceleration of the to is connected to the folding material, which leads to the loop being grasped at different speeds by the Rolling can lead.

It is particularly advantageous that the operating speed of the folding machine according to the invention can be increased so far with very precise and clean folding that it can be adapted to the operating speed of automatic sheet feeders. It is thereby achieved that the folding of sheets of any format with the folding machine according to the invention can be carried out at optimum speed.

Fixed rollers or the like can be provided as a festival. In an advantageous Ausfüh approximate form of the invention it is provided that the fixed holder associated with the movable pressing jaws is mounted for joint movement with these pressing jaws. This ensures that the sheet is always held at the same distance from the pressure gap on the press jaws, which is adapted to the material to be folded, and so the position of the fold can be determined particularly precisely. The invention is in the following description

; An embodiment of a folding machine presented in a greatly simplified schematic manner in the drawing explained in detail according to the invention.

It shows

F i g. 1 shows a partially sectioned schematic side view of the embodiment,

Fig. 2 to 5 excerpts from Fig. 1, which together cooperating parts of the embodiment according to FIG. 1 in the various show successive working phases of the machine.

The exemplary embodiment of the folding machine shown in the drawing has a machine frame 1 on, the upper surface of which forms the alignment surface 2 as a folding table, on which sheet-shaped material, e.g. Sheets or webs are aligned for folding. The alignment surface 2 is here partially by the upper side surfaces formed by two pressing jaws 3 and 4, of which the pressing jaws 3 in the machine frame 1 fixed and the press jaw 4 is slidably mounted parallel to the alignment surface 2, like that by which is axially displaceable in a bearing bore S of the machine frame and supports the press jaws 4 Pin 6 is illustrated. The pin 6 is with a drive not shown in the drawing connected, through which the press jaws from its in F i g. 1 position shown in which he is in a a distance from the press jaw 3 forming a pressure gap 7 is located up to the point of contact with the press jaws 3 and can be moved back again.

Above the alignment surface 2 are fixtures 8 and 9 and as a forming device for forming a loop a rebate strip 11 and facing away from the AusriclUfläche Side of the pressure gap 7 at least tin gripper 12 is provided. Both clamps 8 and 9 are so arranged over the alignment surface 2 that they interact with a press jaw 3 and 4, respectively. The warehouse 13 of the retainer 9 assigned to the movable press jaw 4 is fixed to the press jaw 4 connected so that it joins the movement of the press jaw 4.

In addition to the fixed jaw 3, a conveyor 14 is provided, which is to be folded Material 15, for example, a single sheet, promotes to the alignment surface 2, where this sheet z. B. by means of adjustable alignment strips, not shown in the drawing, are aligned with respect to the pressure gap 7 be that the fold formed in the nip 7 is exactly at the desired location.

For the clamps 8 and 9, the folding bar 11 and the gripper 12, these are moving up and down, in Drives not shown in the drawing are provided. These drives are with each other and with the drive of the press jaw 4 in the following in the individually described way coupled together. A single drive can therefore also be provided from which the movements of the individual parts are derived in a known manner.

The following is the sequence of movements of the various parts ... together with the mode of operation of the folding machine.

After a sheet is aligned on the alignment surface 2, as shown in FIG. 2 is shown, move at the same time the retainer 9 and the folding bar 11 down, the retainer 9 the sheet presses against the press jaws 4 before the sheet is touched by the folding bar 11. Immediately afterwards on this the rebate strip 11 moves into the pressure gap 7 and thereby presses into the pressure gap a loop of the bow, like the one in FIG. 3 is shown. Here is the one above the press jaw 4 located arch part held by the retainer 9 on the press jaw 4, during the The arch part located above the press jaws 3 moves towards the pressure gap 7. During education the loop moves the retainer 8 downwards and clamps the sheet on the press jaw 3

ίο fixed at the moment in which the rebate strip 11 the has reached the lowest point within the pressure gap 7. At this moment the rebate strip 11 begins immediately their return movement to their starting position, and at the same time the movable press jaw 4 begins its closing movement and, in its closed position, presses the loop formed by the bow between the jaws 3 and 4 together to form a fold (Fig. 4). Immediately afterwards the press jaw moves 4 back, and the gripper 12 begins its

»Ο upward movement so that it is immediately after opening of the nip 7 engages in this and detects the fold just formed. Once that is done is, the holders 8 and 9 both rise together from the alignment surface 2 and give the Boas gene free, so that now the downward movement of the Gripper 12 can begin, in which the sheet through the pressure gap 7 through from the alignment surface 2 is pulled. The folding process is now complete. In his in F i g. 1 shown lowest position then opens the gripper 12 and releases the folded sheet so that it can be through one in the Drawing not shown further transport device can be removed.

Clamp in a modified embodiment Both clamps 8 and 9 hold the sheet on the press jaws 3 and 4 at the same time. Once the arch is clamped on the jaws 3 and 4, it is touched by the rebate strip 11 moving down. At the same time as the sheet is touched by the folding bar 11, the press jaw 4 closes of the pressure gap 7 is moved in the direction of the press jaw 3. The speed of movement of the folding bar 11 and the movable press jaw 4 are coordinated so that the part to be folded of the material is always tightened while the loop is being formed remain. Even before the press jaw 4 hits the thin rebate strip 11, it will quickly go out pulled out of the pressure gap 7, so that then immediately afterwards the fixed by the retaining η The loop can finally be pressed into a fold at the precisely predetermined point. at this control of the clamps leads to the to be folded Sheet 15 during the formation of the loop through the folding strip 11 does not cause any sliding movement, which is particularly important with freshly printed sheets excludes the colored smudging of the printing ink.

Immediately after the formation of the fold, the press jaw 4 moves back into its starting position. Simultaneously with the return movement of the pressbak-

kens 4, the clamps 8 and 9 also begin their return movements and so release the sheet, so that when the press jaw 4 moves back, the fold is not pulled out of the pressure gap 7 and there from the gripper 12, as described above,

grips and can be pulled out.

In another modified embodiment, there is a suction device in place of or with the rebate part provided, the one in the pressure gap 7

Vacuum generated, through which the part of the sheet to be folded to form a loop in the printing nip? is drawn in. Instead of a vacuum generator, a Compressed air nozzle may be provided, which presses the part to be folded into the pressure gap 7.

In your illustrated embodiment, the one jaw 3 is fixed in the machine frame and the other press jaws 4 parallel to the alignment surface 2

movably mounted. However, it is particularly advantageous for both jaws 3 and 4 to be movable in the same way, e.g. sliding parallel to the alignment surface 2, to be supported and the bearings of the holding devices 8 and 9 to firmly connect each with the associated jaws 3 and 4, so that the retainer 8 and 9 the Participate in the movement of the press jaws 3 and 4. This allows the exact position of the fold to be even better be determined.

For this purpose 1 inflatable drawings

409513 /;

Claims (8)

Patent claims: 1. Folding machine with an alignment surface for a sheet material that is partially through two jaws is formed, of which at least one jaw to open and Closing a pressure gap interrupting the alignment surface can be moved parallel to the alignment surface is stored, with a forming device, which the part to be folded on the alignment surface aligned material in the open pressure gap is deformed into a loop, which is then when closing the nip is pressed together to form a fold, and with the Clamps assigned to pressing jaws for holding the ones lying on both sides of the pressure gap Parts of the material to be folded on the press jaws, as well as with a coupling device, which couples the strength of the holding fixture with the movement of the movable press jaw, characterized in that the Coupling device is designed so that the fastener (8, 9) during the closing movement of the movable press jaw (4) on both sides of the pressure gap (7) lying parts of the to be folded material (15) on the press jaws (3, 4) hold that a control for the forming device is provided, which causes the Formeinrichtunk together with the beginning of the Closing movement of the movable press jaw (4) becomes effective, and that a> device for further transport of the folded Me erial (15) the side of the pressure gap (7) that is turned off from the alignment surface (2) is provided. 2. Folding machine according to claim 1 with retainers which can be moved up and down over the alignment surface are stored, characterized in that the movable press jaw (4) assigned Retainer (9) is mounted for joint movement with this press jaw (4). 3. Folding machine according to claim! or2, thereby characterized in that as a device for the further transport of the folded material (15) at least a gripper (12) is provided, which is used to grasp the fold formed in the after Fold the re-opening pressure gap (7) engages. 4. Folding machine according to claim 3, characterized in that a control of the movement of the gripper (12) and the retainer is provided, through which the retainer (8, 9) the material (15) only release when the gripper (12) has gripped the material (15). 5. Folding machine according to one of claims 1 to 4, characterized in that a device for generating an air pressure is provided as the forming device for forming the loop, which the part of the material (15) to be folded into the pressure gap (7) between the press jaws ( 3, 4) presses. 6. Folding machine according to claim 5, characterized in that a suction device is provided which creates a negative pressure in the pressure gap (7) generated. 7. Folding machine according to one of claims 1 to 6, characterized in that a known folding bar (1.1) is provided as a shaping device for forming the loop inde pendent of the movement of the retainer (8, 9). 8. Folding machine according to claim 7, characterized in that the movement of the folding bar (11) the closing movement of the movable press jaw (4) is adapted so that the to be folded Part of the material always remains taut during the formation of the vision loop.