EP0829441B1 - Device for ejecting stacked and printed sheets - Google Patents

Description

The invention relates to a device for ejecting stacked Press sheet, with a table on which the press sheet is too are stacked and with at least one ejector, the a stack on the table can be created and with which the stack can be pushed away from the table.

Devices of the type mentioned are in so-called stackers or cross layers known and serve to stacked and pressed Printed products from a rotary table of a stacking device push away. This is in a known device A pneumatically controlled rod is integrated in the rotary table forms a so-called output. The stick leads to ejection of a stack of vertical and linear horizontal movements out. With the vertical movements, the rod becomes one recessed position in a position protruding above the turntable raised and after a horizontal movement in the turntable sunk again. When moving horizontally, the above Stick placed on the stack and the stack off the table pushed away. The ejection can be left, right or alternate. An additional idle stroke is here not avoidable.

It is disadvantageous in the known device that an ejection speed of about 1.2 m / sec. not exceeded can be. At higher speeds it leads pneumatically controlled rod made a sudden movement on the stack off and there is a risk that the stack overturned or the printed products are damaged. An improvement would be here by a more complex pneumatic Control is possible in itself, but this would be very complex.

The invention has for its object a device mentioned type to create a much higher performance enables and yet functionally reliable and inexpensive can be produced.

The task is in a generic device solved that the ejector above the table on a closed Is mounted all the way around on a lever gear. In the device according to the invention, the ejection element is continuously movable and can, for example, with a servo motor can be controlled freely. One from a servo motor controlled continuous movement of the ejector not only very gentle, but can also at very high speed can be controlled reliably. So it's ejection speeds of, for example, 3 m / sec. possible. It is also essential that the drive and the lever gear are fully controllable from the turntable. The lever gear also enables very space-saving accommodation over a stacking shaft.

Two or more ejection elements are preferably provided, which alternately eject a stack. Are two Ejection organs provided with respect to a common Axis of rotation are arranged diametrically opposite, so after the Ejecting a stack already the other ejector ready for another ejection movement, which is a special one enables high performance.

A particularly simple, yet functionally reliable version the lever gear has according to a development of the invention a horizontally extending arm on one rotatably driven part is slidable and on which Ejection element is attached. In the case of two ejection bodies, according to a further training the invention two arms alternately in a control curve out, and these two arms are, for example, with one slidable with each other between these mounted pinions connected. By coupling the two arms, it is sufficient if only one arm is guided in the control curve, which in terms of design, significant simplifications and a space-saving design enables. Further advantageous developments and features result from the dependent claims, the description below and the Drawing.

Fig. 1

eine Draufsicht auf die erfindungsgemässe Vorrichtung, wobei zur besseren Sichtbarkeit Gehäuseteile weggelassen sind,

Fig. 2

einen Schnitt entlang der Linie II - II der Figur 1,

Fig. 3

einen Schnitt entlang der Linie III - III der Figur 1 sowie schematisch eine Ansicht eines Antriebsmotors,

Fig. 4

einen Schnitt entlang der Linie IV - IV der Figur 1,

Fig. 5

schematische Ansichten von Teilen der Vorrichtung gemäss Figur 1,

Fig. 6

eine Ansicht eines Teiles der Figur 1, und

Fig. 7 und 8

schematische Ansichten der erfindungsgemäs sen Vorrichtungen.

An embodiment of the invention is explained below with reference to the drawing. Show it:

Fig. 1

2 shows a plan view of the device according to the invention, housing parts being omitted for better visibility,

Fig. 2

2 shows a section along the line II-II of FIG. 1,

Fig. 3

2 shows a section along the line III-III in FIG. 1 and schematically shows a view of a drive motor,

Fig. 4

2 shows a section along the line IV-IV of FIG. 1,

Fig. 5

schematic views of parts of the device according to FIG. 1,

Fig. 6

a view of part of Figure 1, and

7 and 8

schematic views of the devices according to the invention.

According to FIG. 1, the device has a turntable 3, that for cross-wise stacking of printed products 1a by a vertical one Axis of rotation M is rotatable. The printed products 1a will the rotary table 3 in a known and not shown here Stacking shaft merged into a stack 1 in a known manner and pressed. A slidable stop 2 is above that Rotary table 3 arranged and enables the stacking of printed products 1a different formats.

Above the rotary table and at a distance from it is a lever mechanism 5 arranged, which serves to stack 1 in Figure 1 to the left, to the right or alternately in these directions eject and thus another not shown here Feed system. The ejection is shown schematically in FIG of a stack 1 shown to the left. The lever gear 5 is accommodated in a box-shaped frame 4 above the stack 1.

The lever mechanism 5 has two for ejecting the stack 1 with respect to an axis of rotation 24 diametrically opposite and vertically extending rods 20 which are an ejection member form. These rods 20 are at an upper end 20a, respectively firmly attached to an arm 15 and move on one endless resp. closed path W. As shown in Figure 1, runs a section W 'of the path W linear, namely where the stack 1 to be ejected is located. Each rod has 20 a free lower end 20b that the table 3 between two ridges, for example, ledges 20a happened so in any case the bottom printed product 1a of the stack 1 can be recorded. Below is the control of the bars 20 explained in more detail.

According to FIG. 4, the two rods 20 are each on one side projecting neck 20a of an arm 15 attached. At the opposite end is on each arm 15 also on one laterally projecting shoulder 18 each have a roller 19 mounted, which according to Figure 4 in a control curve 22 of a horizontal Plate 23 engages. The course of the control curve 22 is shown in Figure 1. The control curve 22 is approximately U-shaped and open at both ends 25.

The two arms 15 are parallel and can be moved in opposite directions mounted on a rotating part 10. This roughly Z-shaped turned part According to FIG. 6, 10 has two approaches 10a, each of which an arm 15 is attached. The approaches 10a are in accordance with Figure 2 provided with a bearing 14 which in a guide groove 16 of the corresponding arm 15 is inserted. The rotating part 10 thus carries both arms 15 and allows the aforementioned parallel and horizontal and synchronous displacement of the two arms 15th

According to FIGS. 3 and 5, there is between the two arms 15 with bearings 9 and 13 a pinion 12 fixed to the frame and coaxial to Axis A of the rotating part 10, a pinion 12 mounted, which with serrations 21 of the two arms 15 combs. A shift of one Arms 15 thus inevitably causes the same but opposite Displacement of the other arm 15.

According to FIG. 3, the rotating part 10 has screws 11 on the underside a wheel 8 is attached, which is rotatably mounted on the frame 4 and that by means of a toothed belt 7 with a motor 6 as a drive connected is. The motor 6 is preferably a servo motor and allows a controlled rotary movement of the rotating part 10 in both directions.

If the rotating part 10 is driven by the motor, the rotate with both arms 15 in the same direction. Now become the arms 15 rotated clockwise in Figure 1, the moves rod 20 shown on the left and the one shown on the right Rod 20 forward. The one arranged to the left of the axis of rotation 24 Guide roller 19 moves into the cam 22 while the other guide roller 19 leaves the cam 22. Starting from the position shown in Figure 1 is now during a rotation of 180 ° only in the control curve 22nd retracted guide roller 19 engages with curve 22. Directly controlled by curve 22, therefore, only that in Figure 1 shown arm 15. The engagement of the pinion 12 on the two arms 15 now causes the other arm 15 to be the same but executes opposite and synchronous movements. Moving counterclockwise will change accordingly the other arm 15 is controlled directly by curve 22. Has a clockwise movement on the right in Figure 1 rod 20 shown reaches the position shown in broken lines, so it lies on stack 1. With continuous continuation the movement now becomes stack 1 in the direction of the arrow 26 shifted to the left and finally leaves the turntable 3. The ejecting rod 20 also leaves the turntable and moves away from turntable 3 on path W while the other rod 20 in Figure 1 from the right of the turntable 3 and a newly formed stack 1 approaches. A newly formed one Stack 1 is now ejected by the following rod 20. Of course, there is also a counterclockwise movement possible. Finally, the motor 6 can also do so can be controlled that the two rods 20 alternately left and be moved to the right. The rotational movement is preferred continuously. Changes in speed are however easily possible, for example a delay the speed when applying a rod 20 to the Stack 1 should be appropriate. This enables a particularly gentle Ejection. After ejection, the speed of rotation be increased again. Controlling the speed is the type of printed products 1a and for example also adjustable to the height and weight of the stack 1. In order to can each stack 1 with the highest possible speed be expelled.

Claims (11)

1. Device for ejecting stacked printed sheets (1a), comprising a table (3) on which the printed sheets (1a) are to be stacked and comprising at least one ejector element (20) which can be brought to bear against a stack (1) situated on the table (3) and by means of which the stack (1) can be pushed away from the table (3), characterised in that the ejector element (20) is supported above the table (3) on a lever mechanism in such a manner that it circulates around a closed path (W).
2. Device according to claim 1, characterised in that the ejector element (20) has a rod held at its upper end (20a).
3. Device according to claim 1 or claim 2, characterised in that the closed path (W) has a linear displacement section (W') associated with the ejecting movement of the stack (1).
4. Device according to claim 3, characterised in that the closed path (W) extends in a horizontal plane.
5. Device according to claim 3 or claim 4, characterised in that the ejector element (20) is guided alternately in the direction of the path.
6. Device according to one of claims 1 to 5, characterised in that the ejector element (20) can be freely actuated.
7. Device according to one of claims 1 to 6, characterised in that the ejector element (20) is mounted on a horizontally extending arm (15) which is displaceable on a part (10) driven in rotation.
8. Device according to claim 7, characterised in that the arm (15) is guided in a cam (22) at a distance from the ejector element (20).
9. Device according to claim 8, characterised in that two ejector elements (20) are provided, each mounted on a respective arm (15).
10. Device according to claim 9, characterised in that the two arms (15) are guided alternately in a cam (22) and that these two arms (15) are displaceably connected together, e.g. by a pinion (12) supported therebetween.
11. Device according to one of claims 1 to 8, characterised in that two ejector elements (20) are provided and are arranged diametrically opposite one another relative to a common axis of rotation (24).

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