DE2119372A1 - Device for the automatic folding of sheet material - Google Patents

Description

K 2027 / Gbm 4831 FP-Dr.Hn-ur April 19, 1971

Description for the registration of

KALLE AKTIENGESELLSCHAFT Wiesbaden-Biebrich

for a patent

Device for the automatic folding of sheet material

The invention relates to a device for automatically folding sheet material with which it is possible is to provide the material with sharp-edged parallel folds at any distance.

In a number of known folding devices (see e.g. the German Offenlegungsschriften 1 611 375 and 1 8o4 082) the material is between two rollers running against each other and provided with rebate profiles at certain intervals.

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However, these devices only allow the material to be folded with a certain constant distance between the folds. In order to achieve, for example, a larger distance between the folds in the material, a device of the same type with rollers of larger diameter is necessary. With these devices it is generally not possible to fold the material with unequal distances between the folds, so no standard folds, for example according to DIN, are possible. - ■■■■■ '"

In other known devices are used to produce the folds, two push-pull pivoting levers 'with' transport bars, which draw the material discontinuously into the device in cycle steps determined by the distance between the folds and clamp the material in the outermost pivot position, whereby the. Folding occurs. With these devices, a fold is achieved with constant fold spacing. Although it is possible ¹ to provide different sheets with folds of different spacings, it is not possible, however, to achieve unequal distances between folds on a sheet in one and the same device.

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Furthermore, splitting devices are known with which a sheet is provided with unequal gap spacings can be. The column sequence of the distances is, however unchangeable within a machine due to the arrangement of the transport and folding rollers, so that for a standard folding, e.g. the folding according to DIN 824, for every format size of the to be folded A device would be necessary

The object of the present invention was to create a device for folding sheet material, which makes it possible to achieve folds with different fold spacings on one sheet, and which makes it possible in one and the same device different format sizes according to a standard folding, e.g. DIN 824, to be folded.

In a further embodiment of the invention, the device should also be suitable for folding with constant To carry out the distances between the folds.

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According to the invention a device for automatic Splitting of sheet material suggested that is characterized by a drum, a driven, pivotably mounted feed roller pair, its Rollers running against each other are to be brought into contact with the drum alternately by pivoting, at least one switching element located in the transport path of the material and responding to the leading edge of the material and a control device to be set in motion by this switching element for the pivoting of the feed roller pair.

The pair of feed rollers can be pivoted about an axis that is parallel and in the middle between the axes of rotation its reels runs. As a result of the pivoting movements of the pair of feed rollers, one of them comes alternately Rollers in contact with the drum. Since the two rollers run against each other, the one with the drum has to change in contact with the roller result in a change in the direction of rotation of the drum. When changing the direction of rotation A pallet is created in the material, because the part that is already running on the drum and that through the feed roller pair incoming part of the material from the roller of the feed

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roller pair are driven over, which when pivoting in Is brought into contact with the drum.

The switching element located in the transport path of the material can be a mechanical switch, ζ. B, microswitch, or a photoelectric switch, e.g. B, a photocell. The switching element is preferably in the Transport path of the material arranged so that it is actuated by the leading edge of the material when the first pallet should arise. If the switching element is arranged so that it is actuated earlier, it must be between the switching element and a delay timer can be connected to the control device. In the case of arm folds, e.g. B. according to DIN 824, is the The distance between the leading edge of the material and the first fold is the same for all formats. For non-standard folds with constant fold distances, the distance between the leading edge of the material and the first fold must be variable, depending according to which constant pleat spacing is desired. An in is preferably used for such folds its position adjustable switching element or several, individually selectable switching elements.

The control for the pivoting of the feed roller pair can be done mechanically or electromechanically. Preferably, however, the control device consists of electronic

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see timers »The timers consist of several time levels. At the beginning of each time step, the pair of feed rollers is swiveled and, as described above, provide the material with a new fold. The last time stage determines the end of the folding process. Each time element is responsible for the folding of a format size according to a standard convolution, e.g. a time element for folding a DIN AO sheet according to DIN 824 folding, -

In non-standard folds d _f h, indefinite in the folding of a material length with constant folding intervals, the associated timer may contain no defined last time stage, which completes the folding process, as the end of the material is not known. In order to ensure that the FaItVorgang is ended at the right time, a further switching element is provided in the transport path of the material, which responds to the rear edge of the material. As soon as this switching element is released from the rear edge of the material, it acts on the timing element responsible for the constant convolution in question and determines its last timing stage.

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On both sides of the feed roller pair guide elements can be attached, which extend over part of the Extend the drum circumference and both guide the material on the drum and press it against the drum. as Guide elements can be used in a known manner, guide plates, guide belts or rollers running on the drum will.

At the beginning of the folding process, when the material is being fed in, there are two starting positions for the pair of feed rollers possible. In the first starting position that roller of the pair of feed rollers is in contact with the drum and drives it, which feeds the leading edge of the material to the switching element. The other preferred The starting position is the pair of feed rollers only slightly inclined relative to the horizontal, so that none of the rollers Is in contact with the drum. During this time, the drum is powered by its own motor with a greater peripheral speed driven as the feed roller pair. The direction of rotation of the drum is chosen so that the leading edge of the material is promoted in the direction of the switching element. This starting position makes one less prone to failure Transport of the material secured. at

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When the switching element is actuated by the front edge of the material, the drum motor is switched off and the pair of feed rollers pivoted into the position in which one of the rollers is in contact with the drum and drives it.

A guide track is attached to deliver the folded material to one side of the drum. on which the material slides into a collecting tray.

A second guideway is available for delivering the folded material to the other side of the drum. which is arranged so that the folded material from her to the other guide track falls and slides from there into the collecting tray. This arrangement of the guideways ensures that the folded material is always in the direction of rotation of the drum at the end of the folding process same location, e.g. B. with the label facing up, runs into the drip tray.

The invention is to be explained in more detail with the aid of an exemplary embodiment and with the aid of the drawings.

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Show it

Figure 1 shows a cross section through the device,

Figure 2 shows an enlarged section of Figure 1, Figure 3 shows the position of the material in different

Phases of wrinkling,

Figure 4 is a right side view of the device, Figure 5 is a left side view of the device, Figure 6 is a block diagram of the control device.

The housing of the device is denoted by 1 in FIG. A sheet 2 to be folded is entered with its label field pointing upwards and forwards (indicated in the drawing as a thick line) over a feed table 3 and under a guide plate 4 between the rollers 5 and 6 of the feed roller pair, which convey it onto the drum 7. The transport path of the sheet along the drum 7 is limited either by the guide roller 8 and the pressure roller 9 or by the guide roller 10 and the pressure roller 11, depending on their direction of rotation. After the folding process, the folded sheet 2 ¹ arrives at the depending on the direction of rotation of the drum 7

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last wrinkle formation either over the guideway in the collecting trough 13, or it slides over the guideway 14 onto the guide track 12 and from there into the collecting tray 13. Lying in the transport path of the sheet 2 following the pressure roller 9, two photocells 15! and 16 that on. address the leading edge of the sheet and depending on the desired distance between the leading edge of the sheet and first, folds can be selected individually. In front of the feed roller pair 5 »6 there is another photocell 17, which is on the trailing edge of the sheet responds.

The pair of feed rollers 5, 6 is mounted in a carrier 18 and is driven by the motor 19 via the coupling 20, the chain 21, the sprocket 22 and the gears 23 and 24 at a constant peripheral speed (see FIG. 5). The pair of feed rollers 5, 6 is held by the magnet 25 in an initial position that is slightly inclined with respect to the horizontal (see FIG. 4). If the magnet 25 is de-energized and one of the two magnets 26 and 27 is energized, the feed roller pair 5, 6 with its carrier 18 is rotated about the axis 28 into the position 5 ¹ , 6 'or 5 ", 6". In the position 5 ', 6', the roller 6 is in contact with the drum 7 and drives it (shown in FIG. 5), while in FIG

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the position 5 "» 6 "the roller 5 drives the drum 7 (see. Figure 2).

FIG. 4 shows the starting position in which the magnet is energized, the magnets 26 and 27 are de-energized and the switches S 29 and S 30 are both electrically closed. During this time, when none of the rollers 5 and 6 make contact with the drum 7, this is controlled by the motor 3I Driven by chain 32, sprocket 33 and clutch 34. In the starting position, the pressure roller 9 is lifted from the drum 7. By energizing the magnet the pressure roller 9 is brought into the position 9 'via the rod 36 around the axis 37 (shown in FIG. 5).

FIG. 6 shows a schematic block diagram for the initial position of the device, i. H. when the device by the main switch S 38 is turned on, but the front edge of the sheet 2 the photocells 15 or 16 has not yet reached. When entering sheet 2, one of the switches S 39a to S 39f is switched from actuated by the operator and thus one of the timing elements 40a to 40f of the control device 40 is selected. If sheet 2 is to be folded in accordance with the standard, e.g. in accordance with DIN 824, one of the

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Timers 40a to 40d selected. On the other hand, if sheet 2 is to be folded with constant column spacing one of the timing elements 4Oe to 4Of is selected. In the embodiment described here the constant pleat spacing for which the timer 4Oe is selected (190 mm) corresponds to the Distance that the leading edge of the material has from the first pallet in the case of splits in accordance with the standard. Therefore the timer 40e as well as the timers 40a to 40d by the photocell 15 are set in motion. The timer 4Of can be selected for a second constant pleat spacing (210 mm) and is generated by the photocell set in motion.

Each of the timers 40a to 40f contains 1 to η Time stages. Each time stage controls the next time stage. In the timers 40a to 4Od for standard folds the last time step is fixed. With timers 40e and 40f for non-standard Foldings with constant column spacing, where the leaf length is unknown, becomes the last time stage determined by the photocell 17. As soon as the photocell is released from the trailing edge of the sheet, it gives one

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Pulse to timer 4Oe or 40f. This pulse causes the timer that is running at the time of the pulse, as well as the next time step already activated by it are still running, but no, further time step, more is controlled.

The last time stage η of each timing element 40a to 40f actuates a wiping relay 4l, which switches the device back into brings the starting position.

Should z. B. folded a DIN AO sheet according to the DIN 82 4-fold are operated, the switch S 39a is operated by the operator. This makes the timer 40a selected and the photocell 15 turned on. The device is in the starting position in which the pair of insertion rollers 5, 6 has no contact with the drum 7 and the pressure roller 9 is lifted off the drum 7. This position is shown in Figure 2 with solid lines. As already described above, the Drum 7 by its motor 31 in the in Figure 2 as direction of rotation shown by solid arrow,

The one above the feed table 3 and below the guide plate 4 entered sheet 2 is detected by the feed roller pair 5, 6 and fed to the drum 7, which it under the

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Guide roller 8 and the lifted pressure roller 9 to the photocells 15 and 16 promotes. The introduced Part of the sheet 2 has the position shown in Figure 3a. As soon as the front edge of the sheet 1 actuates the photocell 15 set by the switch S 39a, attracts a relay 42, which holds itself via a contact, and the switch S 42a assigned to it up to S 421 actuated. This switches off the drum drive and the pair of feed rollers 5 »6 for a short time braked, as well as the first time stage of the before input of the sheet 1 charged by the switch S 39a selected timer 4.0a.

In detail, the following processes take place: The switches S 42a to S 42c are opened and thereby the motor 31 of the drum 7 is switched off, the clutch for the drum 7 is disengaged and the magnet 25 is de-energized. Since the switch 42d is closed, ^ the Magnet 35 energized and thereby the pressure roller 9 in brought the position 9 '. The switch S 42e is closed and, since the switches S 29 and S 30 are also closed, the relay 43 picks up, whereby the Switch S 43 lifted from contact 44 and attached to the

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Contact 45 is placed, ie the feed roller brake 46 and the drum brake 47 are energized and the feed roller clutch 20 is disengaged. Furthermore, the switches S 42f to S 421 are closed, whereby the connections between the switches S 39a to S 39f and the respective associated timing elements 40a to 40f are closed. However, "only the first time step of that time element that was previously selected is applied, in this case the first time step of the time element 40a. The first time step excites the magnet 27, causing the feed roller pair 5, 6 about the axis 28 to be in position 5 ¹ , 6 ¹ , in which the roller 6 is in contact with the drum 7 and drives it in the direction of the broken arrow The guide rollers 8 and 10 and the pressure rollers 9 and 11 are driven by the drum 7 in the direction of the broken arrows (See Figure 2) When the magnet 27 is fully energized, the switch S 29 is opened, causing the relay 43 to drop out and the switch S to be lifted from contact 45 and applied to contact 44, with the result that the feed roller brake is applied 46 and the drum brake 47 are released and the feed roller

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clutch 20 is engaged.

The part of the sheet 2 which is already on the drum 7 has at this time the position shown in FIG. Jb , and is also conveyed in the new direction by the new direction of rotation of the drum 7. This part of the sheet 2 as well as the part newly entering through the feed roller pair 5 »6 are passed over by the roller 6 (see FIG. 3b), the first fold is formed.

The second time stage is triggered by the first time stage of the timing element 40a. After the first The part of the sheet 2 which runs on the drum 7 is in the position shown in FIG. 3c. At the beginning of the second time stage, the magnet 27 is de-energized, whereby the switch S 29 is closed. At the same time, the magnet 26 is excited. As long as the magnet 26 has not yet reached its end position, the switch S 30 is still closed. Since all three switches S 29, S 30 and S 42e are closed for a short time are, the relay 43 is attracted and the switch S 43 is placed from contact 44 to contact 45,

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whereby the feed roller brake 46 and the drum brake Tighten 47 with the feed roller clutch disengaged. If the magnet 26 is fully excited, it opens he the switch S 30, whereby the relay 43 drops out and the switch S 43 comes back to the contact 44. The brakes 46 and 47 are released again and the clutch 20 is engaged. Due to the excitation of the magnet 26, the pair of feed rollers 5, 6 pivot into the Position 5 ", 6", in which the roller 5 drives the drum 7 in the direction of the solid arrow. The leaf has the position shown in Figure 3d, and the second Palte is created.

This process is repeated at the beginning of each subsequent time step. The last time stage η actuates the wiping relay 41, whereby the self-holding contact of the relay 42 is canceled and the switches S 42a to S 421 are switched to the starting position shown in Figure 6, i.e. the feed roller pair 5, 6 comes back to its starting position, the motor 31 drives the drum 7 and the pressure roller 9 is lifted off the drum 7. In the meantime, the completely folded sheet 2 ^{1 has} slipped into the collecting tray 13, as already described above.

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If a sheet 2 is to be folded with a constant crease spacing of 210 mm, the same run flat described processes, with the exception that the switch S 39 f set, and thereby the timer ' 40f. And photocell l6 is selected. Hence be the processes for forming the first fold are only triggered when the leading edge of the sheet actuates the photocell 16. Another difference to the sequence described above is that the last time stage η is not is fixed from the outset, but is determined by the photocell 17 when this is from the 'sheet trailing edge is released. "-.

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Claims (9)

Claims l.j device - for the automatic splitting of Sheet material, characterized by a drum (7) »a driven, pivotably mounted feed roller pair (5, 6), whose counter-rotating rollers alternately come into contact with the drum (7) by pivoting are to be brought, at least one in the transport path of the material (2), on the leading edge of the material responsive switching element (15) and a control device to be set in motion by this switching element (15) (40) for pivoting the pair of feed rollers (5, 6). 2. Apparatus according to claim 1, characterized in that the control device (40) consists of at least an electronic timing element (40a to 40f). 3. Device according to one of claims 1 to 2, characterized in that on both sides of the pair of feed rollers (5, 6) extend over part of the drum circumference extending guide elements (8, 9, 10, 11) for the material (2) are attached. 209845/0029 4. Apparatus according to claim 3 »characterized in that the guide elements (8, 9, 10, 11) are rollers for the material (2) running on the drum (7). 5. Device according to one of claims to 4, characterized in that the feed roller pair (5, 6) can be pivoted into a position in which none the rollers of the feed roller pair (5 »6) is in contact with the drum (7) and in this position the drum (7)
is drivable. 6. Device according to one of claims to 5, characterized in that the position of the switching element (15) is adjustable in the transport path of the material (2), 7. Device according to one of claims to 5 »characterized in that at least two on the front edge of the material (2) responsive, individually selectable switching elements (15, l6) in the transport path of the
Materials (2) lie. 209845/0029 8 _β device according to one of claims 1 to 7j characterized in that another on the Material trailing edge responsive switching element (17) is in the transport path of the material that the control device (40) turns off. 9. Device according to one of the claims to 8, characterized in that a guide track (12) and an adjoining collecting tray (13) are provided for outputting the folded material (2 ¹ ) to one side of the drum (7) and that for outputting the folded material (2 ^f ) on the other side of the drum (7) there is a second guide track (14) from which the material (2 ') falls onto the above-mentioned guide track (12). 2Ü9845 / 0Ü29