EP0141136B1 - Delay section for a folding apparatus - Google Patents

Description

The invention relates to a tape delay line for a folder, in which folded or to be folded copies can be introduced into a tape line system forming the delay line, the tapes of which can be driven at a variable speed in such a way that when the copy is taken over, the tapes (tape sections) have a high rate Run speed, after which they reduce their speed after detecting the specimens (see DE-A-3049595).

In the older patent application P 3321 811.0-27, a folder with a delay line formed by tape sections is already described. To change the speed of the belt sections, belt deflection rollers are moved back and forth in the rhythm of the speed variations parallel to the direction of the fold copy transport. These displacements can cause undesirable signs of wear, which have a particularly negative impact on the service life of the conveyor belts used.

• Figuren 1 und 2 eine erste Ausführungsform der erfindungsgemäßen Bandverzögerungsstrecke,
• Figuren 3 und 4 eine Variante einer sich an die Ausführungsform gemäß Fig. 1 und 2 anlehnenden Bänderführung,
• Figur 5 eine Bandverzögerungsstrecke mit nur einem Bandsystem,
• Figur 6 eine Bandführungsrolle,
• Figur 7 eine Bandumlenkrolle,
• Figur 8 ein weiteres Ausführungsbeispiel einer Bandverzögerungsstrecke und
• Figuren 9 und 10 eine empirische Entwicklungsmöglichkeit des Exzenterkurvenverlaufes, mit dessen Hilfe eine sinusförmige Bandverzögerung und Bandbeschleunigung mit der Vorrichtung gemäß Fig. 7 ermöglicht werden.

The object of the invention is to create a delay line of the type defined in the introduction, in which the rhythmic belt accelerations and decelerations are possible solely by the rotation of belt guide elements. This object is achieved by applying the features of the characterizing part of the patent claim. Further developments result from the subclaims and from the description in conjunction with the drawings. Each of these shows schematically:

• FIGS. 1 and 2 show a first embodiment of the band delay line according to the invention,
• FIGS. 3 and 4 show a variant of a belt guide based on the embodiment according to FIGS. 1 and 2,
• FIG. 5 shows a band delay line with only one band system,
• FIG. 6 a tape guide roller,
• FIG. 7 a belt deflection roller,
• Figure 8 shows another embodiment of a band delay line and
• FIGS. 9 and 10 an empirical possibility of developing the eccentric curve profile, with the aid of which a sinusoidal band deceleration and band acceleration are made possible with the device according to FIG. 7.

The band delay lines shown can be arranged, for example, behind the folding flap or collecting cylinder of a folding apparatus in order to feed the cross-folded printed copies to a third fold, the so-called “second longitudinal fold”. As is well known, it is necessary here for the fold copies coming out of the machine or out of the cylinders to be braked. The belt deceleration line must therefore take over the folding copies at machine speed and then brake them, the delivery of the folding copies, for example to a pair of folding rollers, to take place at minimum speed.

1 and 2, fold copies E coming from the right are fed to a delay line A. This belt deceleration system essentially consists of eccentrics 2 and 3, which are arranged on a shaft 1 in a manner fixed against relative rotation, around which the upper belt 4 is partially guided. As can be seen in FIG. 1, both eccentrics 2, 3 have the same eccentricity X. The shape and size of the eccentrics 2 and 3 are the same, but the eccentric 3, based on the eccentric 2, is offset by 180 ° on the shaft 1.

After the delay line A, the belt section a is fed to the upper eccentric 2, which, as shown in FIG. 2, lies in a different plane than the eccentric 3. After the eccentric 2 is partially wrapped, the belt section b leaves the eccentric 2 and becomes a deflection roller 5 led. The deflecting roller 5 has the task of deflecting the belt 4 and guiding it from the plane of the eccentric 2 into the plane of the eccentric 3, as can be seen in FIG. 2. The belt section c passes behind the deflection roller 5 to the eccentric 3 and also wraps partially around it, after which the belt section d is first fed to a belt guide roller 6 and then via the belt section e to the belt guide roller 7. Between the rollers 7, 6, the belt section f passes through the delay line A. The belt section a is returned to the plane of the eccentric 3 by the belt guide roller 6.

The band delay system shown in Figs. 1 and 2 comprises an upper and a lower band. The lower band 4 'is guided in the same way, but in mirror image, to the upper band 4, which is why the same reference numerals are used for the same components, but each are provided with an apostrophe to distinguish them. The same applies to the embodiment according to FIGS. 3 and 4.

The inventive leadership of the belts 4, 4 'and the arrangement and design of the eccentric means that when the shaft 1 or 1' rotates, which can be driven, the belts 4, 4 'change their speed in the delay line A in the Modify the rhythm of the rotation of the eccentrics 2, 3 or 2 ', 3' in such a way that the copies E to be folded or to be folded in from the right are grasped at the maximum speed and then decelerated. If the copies E reach their minimum speed, they can be folded away in a known manner, for example with the aid of a folding knife.

Due to the advantageous arrangement of the eccentrics 2, 3 and 2 ', 3', on the one hand the speed variation is achieved and on the other hand there is virtually a path compensation for the belts 4, 4 ', without linear displacement processes of deflection means being required here. In addition, the delay line according to the invention can be created at very low cost.

3 and 4 show a modification of the tape guide shown in FIGS. 1 and 2. Since essentially the same components are used in this second embodiment. To distinguish them, only one was prefixed to each reference number. Here, too, upper belts 14 and lower belts 14 'are used, which are guided around the eccentrics 12, 13 and 12', 13 'arranged on the shafts 11, 11' in a rotationally fixed manner. The transfer and deflection of the belts 14, 14 'again takes place with the aid of deflection rollers 15, 15' and 18, 18 '.

The band 14 is fed with its band section 1a first around the eccentric 13 and then over the band section 1 to the deflection roller 15, after which the band section 1c reaches the eccentric 12. As best shown in FIG. 4, both the deflection roller 15 and behind it are rotated by 180 ° of the belt sections 1b and 1c, these rotations of course being carried out in the opposite direction. That is, if the band section 1b is rotated through 180 ° to the right, the band section 1c is rotated through 180 ° to the left, that is, rotated back again. This results in an advantageous guidance of these belt sections between the eccentrics 11, 12 and the deflection roller 15. The belt section 1d behind the eccentric 12 then arrives at the belt guide roller 16 and as belt section e to the belt guide roller 17. The delay line A is between the belt guide rollers 17 and 18 formed, the band guide roller 18 lying below the deflection roller 15 being jointly responsible for guiding the band section 1a into the plane of the eccentric 13.

A comparison of the embodiment according to FIGS. 1 and 2 with FIGS. 3 and 4 shows that the embodiment according to FIGS. 3 and 4 takes up a little more space, since the belt 14 with the sections 1d, 1e must be guided around the outside of the belt guide roller 16 .

5 and 6 show a particularly advantageous embodiment, in which only a single band is used instead of upper and lower bands. Another arrangement of the eccentrics is also proposed here. In contrast to the two exemplary embodiments described above, the eccentrics 22, 23 on the shaft 21 are not offset from one another by 180 °, but lie one behind the other.

To differentiate between similar components and strip sections, the reference numerals are preceded by a 2 and 3 respectively in the illustration according to FIGS. 5 and 6.

The specimens E entering the delay line A from the right are taken over at the maximum speed of this section of tape and then decelerated in the manner already described. The belt section 2a passes around a front belt guide roller 25, that is to say in the plane of the front eccentric 23, after which the belt section 2b is fed to the front eccentric 23.

Behind the eccentric 23, the band section 2c arrives at a band guide roller 26, which is also in the plane of the eccentric 23. The offset takes place via the belt section 2d to the belt guide roller 27 lying in the plane of the eccentric 22. Behind the belt guide roller 27, the belt section 2e then reaches the rear eccentric 22. After partial wrapping, the belt section 2f runs to the one lying in the plane of the eccentric 22 Tape guide roller 29 and then to the tape guide roller 28 in the same plane as the tape section 2g. For better distinction, the parts and band sections lying in the plane of the rear eccentric 22 have been marked with an asterisk. The tape 24 is returned in the tape section 2a, since the tape guide roller 30 is again in the plane of the eccentric 23, that is to say in the front plane.

As shown in FIG. 5, the lower band line section 2i of the delay line A is formed between the band guide rollers 30 and 31. To form the upper band section 2n of the delay line A, a return, d. H. a detour around the entire arrangement. This runs as a band section 2j around the band guide roller 32, as a band section 2k around the band guide roller 33, as a band section 21 around the band guide roller 34 and as a band section 2m around the band guide roller 35. The upper band section 2n of the delay line A is formed between the band guide rollers 35 and 25. All tape guide rollers 30 to 35 are in the same plane. As already described, rotation of the eccentrics 22, 23 around the shaft 21 results in a deceleration and an acceleration of the belt sections 2i and 2n in the deceleration section A, the required path compensation being automatically ensured by the double eccentrics 22, 23.

It goes without saying that, at right angles to the transport direction of the specimens E, at least two tapes are used next to one another in the same plane in order to ensure reliable detection and deceleration of the specimens E.

In Fig. 7, a deflection roller 15 and 18 is indicated schematically, which is equipped with unspecified rims on both sides. Such rollers ensure a safe guidance of the tapes used.

It goes without saying that the expression "eccentric" also means eccentric-like curves. The two eccentrics used do not necessarily have to be identical curves, but can also be calculated so that no relative movements occur.

Another exemplary embodiment is described with reference to FIGS. 8 to 10.

Fig. 8 shows a tape delay line for a folder into which folded or to be folded copies can be inserted. The tapes of this tape line system can be driven at a variable speed in such a way that when a copy is taken over, the tapes or tape sections run at a high speed, after which they reduce their speed after the copies have been detected.

The copies EO entering the delay line AO from the right are taken over at the maximum speed of this strip section and, as already mentioned, decelerated so that, for example, a fold can be made downwards at the minimum speed. The belt section 20a runs to a front, i.e. H. in the plane of a front eccentric or cam disk 230 lying tape guide roller 250, after which it is fed to the front eccentric 230 as a band section 20b. Behind the eccentric 230, the band section 20c arrives at a band guide roller 260, which is also in the plane of the eccentric 230. The plane offset takes place in the band section 20d to the band guide roller 270 lying in the plane of the rear eccentric or cam disc 220. After the band guide roller 270, the band section 2e then runs directly to the rear eccentric 220. After the eccentric 220 is partially wrapped around the band 240, the band 240 runs as a section 20f to the tape guide roller 290 lying in the plane of the eccentric 220 and then to the tape guide roller 280 in the same plane as the tape section 20g. For better distinction, the parts and band sections lying in the plane of the rear eccentric 220 have been marked with an asterisk. The band is returned to the front plane 240 via the band section 20b, since the band guide roller 300 is again in the plane of the eccentric 230, that is to say in the front plane.

As can be seen in FIG. 8, the lower band line section 20i of the delay line AO is formed between the band guide rollers 300 and 310. To form the upper band section 20n of the delay line AO, a return, that is to say a detour around the entire arrangement, must then take place. This runs as a belt section 20j around the belt guide roller 320, as a belt section 20k around the belt guide roller 330, as a belt section 201 around the belt guide roller 340 and as a belt section 20m around the belt guide roller 350. The upper belt section 20n of the delay line AO is formed between the belt guide rollers 350 and 250. All tape guide rollers 300 to 330 are on the same level. When the eccentrics 220 and 230 rotate about the shaft 210, the belt sections 20i and 20n are decelerated and accelerated in the deceleration section A0. It goes without saying that at least two bands are used next to one another transversely to the direction of transport of the copies EO in the same plane in order to ensure reliable detection and delay of the copies EO.

In contrast to the device according to FIGS. 1 to 7, the belt section 20c is not guided from the front eccentric 230 directly to the belt guide roller 260, but via a roller 360 forming a belt length compensation element, which e.g. B. is movable via a lifting element 400 in the direction of the arrow, so that in the inventive design of the outer contour of the eccentric 220, 230, a compensation of the rhythmically occurring band length differences can take place. Instead of a piston carrying the roller 360, an eccentric can also be used, the outer contour and eccentricity of which are fixed in such a way that it can compensate for the band length differences that occur.

As can be seen from FIG. 8, the two eccentrics 220, 230 used, which are arranged in mirror image to a common center line MO in order to obtain the smallest band length differences, each have an outer contour that deviates from the circular shape. In the exemplary embodiment shown, one half of the outer contour each has approximately the shape of an isometric and the other half has the shape of a dimetric ellipse. This results in sinusoidal decelerations and sinusoidal accelerations in the band sections 20i and 20n in the band delay line AO during the rotation of the eccentrics 220, 230. The measure of the eccentricity XO of the eccentrics 220, 230 depends on the ratio of maximum speed to minimum speed. Theoretically, a minimum speed of 0 would result if this measure corresponds to half the diameter, i. H. if the two eccentrics 220, 230 would rotate about a point lying on their periphery. In practice, however, the ratio of approximately 4: 1 is sufficient, which means that in this case the common center of rotation is approximately at the level of the lower focal point of the two eccentrics 220, 230 with the approximately elliptical curve shape.

FIGS. 9 and 10 show how the contour of an eccentric can be empirically determined by processing an eccentric, with the aid of which the desired sinusoidal deceleration and acceleration in the deceleration path are possible. 2 shows the development of the outer contour 380 in 30 ° steps of one half of the eccentric according to the invention for the range from 0 ° to 180 °, wherein this is rotated from 0 ° to 180 ° in the direction of the arrow. The outer contour 390 has no influence in FIG. 9 yet. The distance traveled in the deceleration section AO between two belt rolls, not specified, is in each case plotted for 30 °. Fig. 9 clearly shows that over the range of 0 to 180 ° of the band section moving in the direction of the arrow from right to left, the delay line AO results in a sinusoidal slowdown. 10 shows the development of the sinusoidal acceleration with the aid of the curve area 390 between 180 ° and 360 ° in the deceleration distance A. As in FIG. 9, the linear belt movement is again removed for a rotation angle of 30 ° in the deceleration distance AO.

Since in FIG. 9 the curve 380, that is the left half of the contour of the eccentric, and in FIG. 10 the curve 390, that is the right half of the contour, are responsible for the development of the sinusoidal deceleration or acceleration, respectively Areas fully marked, while the areas not directly involved, that is the area 390 in FIG. 2 and the area 380 in FIG. 10, are shown in broken lines.

The mirror-image arrangement of the eccentrics 220, 230 to form a common line MO results in a minimal path difference to be compensated for in the band section 20c, so that the band length compensation elements used have to perform the smallest stroke.

Claims (13)

1. Delay section for a folding apparatus, in which folded copies, or copies to be folded, can be inserted into a belt guide system forming the delay section, the belts of which system (4, 14, 24) can be driven at variable speed in such a way that when a copy is being picked up, the belts (belt sections) run at high speed, and after they have gripped the copies the belts reduce their speed, characterised in that the belts (4, 14, 24) are guided at least partially round equally sized eccentrics lying in two planes and arranged on a common shaft (1, 11, 21), and which have the same eccentricity (X), whereby the end (c, 1 c, 2c) coming from one eccentric (2, 13, 23) is deflected into the plane of the other eccentric (3, 12, 22) by a first guide roller (5, 15, 27), and the belt (4, 14, 24) is guided back again by a second guide roller (6, 18, 30) lying in front of or behind the delay section (A).

2. Delay section according to claim 1, characterised in that on both sides of the delay section (A), belt guide rollers (6, 7 ; 17, 18 ; 25, 35) are arranged in the same plane.

3. Delay section according to claim 1 or 2, characterised in that when the belt (14) is deflected from the plane of one eccentric (12) into the plane of the other eccentric (13), the belt section (1b. 1c) running over the guide roller (15) is rotated twice by 180° into itself (Fig. 4).

4. Delay section according to claim 1 to 3, characterised in that the eccentrics (2, 3 ; 12, 13) are offset by 180° to each other on the axle (11, 11').

5. Delay section according to one of the preceding claims, characterised in that on both sides of the delay section (A, Fig. 1, 3) two identical belt systems (4, 4' ; 14, 14') are arranged on top of each other.

6. Delay section according to claim 1, characterised in that the eccentrics (22, 23, Fig. 5) are arranged congruently on the shaft (21) one behind the other.

7. Delay section according to claim 6, characterised in that the delay section (Fig. 5, A) incorporates a single belt (24), wherein the lower belt section (2i) is formed by guiding the belt (24) round the entire eccentric- and guide roller arrangement over guide rollers (31, 32, 33, 34, 35) lying in the same plane.

8. Delay section according to one of the preceding claims, characterised in that transversely to the travel direction of the belts (4, 4' ; 14' ; 24) at least two belt guides are arranged next to each other.

9. Delay section according to claim 1, characterised in that the cam plates (220, 230) have an external contour which deviates from circularity, so that in the delay section (AO) the belt sections (20i, 20n) running between these are delayed and accelerated rhythmically sinusoidally, and in that in the belt section (20c), in which the belt (240) is guided from the plane of one cam plate (220) into the plane of the other cam plate (230), there is arranged a belt length compensating element (360).

10. Delay section according to claim 9, characterised in that the belt length compensating element (360) is a belt guide roller actuatable by a lifting cylinder (400).

11. Delay section according to claim 9, characterised in that the belt length compensating element (360) is a rotating cam plate.

12. Delay section according to claim 9, characterised in that the cam plates (220, 230) are arranged on a shaft (210) in mirror-image fashion with respect to a common centre line (MO).

13. Delay section according to one of the preceding claims 9 to 12, characterised in that one half respectively of the circumference of each cam plate (220, 230) has approximately the shape of an isometric ellipse, and the other half has approximately the shape of a dimetric ellipse, and the common rotation centre of both cam plates (220, 230) is approximately on a level with an elliptical focal point.

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