JPH0198566A - Drive for folder - Google Patents

Abstract

PURPOSE: To prevent a folded product from being damaged when it is delivered from a folding knife drum to a folding flap drum by synchronously driving a driving device for the folding flap drum in relation to the folding knife drum in a driving device of folder. CONSTITUTION: When the drive of a folding flap drum 7 is performed through a driving device 13, the driving force is introduced from the driving gear 15 of a folding knife drum 5 through a bevel gear 14, and transmitted to a dividing plate 18 through a worm screw 16 and through a following roller 17 geared with the worm screw 16. The dividing plate 18 is engaged with a gear 20 for driving the folding flap drum 7 through a gear 19. According to this, two drums 5, 7 are driven perfectly synchronously at the same speed when a folded product 6 is received. Then, the speed of the folding flap drum 7 is reduced so that the folded product 6 can be carefully delivered from the folding knife drum 5 to the folding flap drum 7.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drive for a folding device having at least one folding knife cylinder and a folding flap cylinder.

BACKGROUND OF THE INVENTION A drive device of this type is known, for example, from DE 28 07 387 A1. In this known drive, the sheets that are pushed by the folding knife into the folding flaps of the adjacent folding flap cylinder, that is, the sheets still present in the folding knife barrel with the perforating needle, correspond to the speed of the folding knife cylinder. The speed is reduced to If the speed of the folding flap cylinder is increased within the range of the working speed of the folding device, which is constantly increased as technology progresses, the speed of the folding flap cylinder will increase when the sheet is withdrawn from the folding knife cylinder. The front section is subjected to a whiplash-like load due to a sudden reversal of the direction of motion, generally from horizontal to vertical, which often causes corner edges of the signature to tear or damage to the signature. It turns out.

SUMMARY OF THE INVENTION It is therefore an object of the invention to prevent the signatures from being damaged when they are transferred from the folding knife cylinder to the folding flap cylinder, even at high production speeds.

Means for Solving the Problems According to the present invention, which solves the above problems, the drive device for the folding knife cylinder is driven synchronously in relation to the folding knife cylinder, but with a pulsating speed change. hand,
When taking up the signatures, the same speed is obtained in each case between the folding knife body and the folding flap cylinder, and then the speed of the folding flap cylinder is reduced while the folding flap cylinder takes up the signature from the folding knife body. is configured to be

DESCRIPTION OF THE PREFERRED EMBODIMENTS The folding device 1 shown schematically in the drawings is fed with a paper wrapper which generally enters through a former 2 . This wrapping paper 3 is cut by passing between the pair of sewing machine rollers 40, so that
A signature 6 is obtained which is fed into the folding knife barrel 5. The folding knife body 5 generally has a perforation needle 8 and a folding knife 9 for receiving the signatures 6. The folding sheets 6 present on the folding knife body 5 are each transferred by the folding knife to a folding flap force 7 applied to the folding knife body 5. This folding flap body 7 is a folding flap 10.
A folding knife 9 is provided inside this folding flap 10.
pushes signature 6.

The signature 6 is then transferred to the folding flap 7, during which the front part of the signature 6 and thus the signature 6 may be damaged.

Signature 6 folded horizontally to form a second vertical fold
is transferred directly from the folding flap cylinder 7 to the impeller 11 or is fed to the pair of folding cylinders 12 by conveying means, not shown in detail, typically belt guides. Paper ejection then likewise takes place via the generally known means shown schematically.

According to the invention, the risk of damage when withdrawing the signature from the folding knife cylinder 5 is reduced as long as the speed of the folding flap cylinder 7 and of the folding knife cylinder 5 are the same while taking up and entraining the signature 6, i.e. During the relatively high speed, however, subsequent signature withdrawal movement,
Since the speed of the folding flap cylinder 7 is reduced in each case, this can be avoided by also reducing the speed when removing the signatures 6 from the folding knife cylinder 5. As a result, the above-mentioned risks are significantly reduced or completely avoided. When the delivery process of the signature 6 has been completed and the signature 6 has been completely placed on the folding flap cylinder 7, the folding flap cylinder 7 is accelerated again so that when picking up the next signature, the folding flap cylinder 7 is accelerated again.
The speeds of the two cylinders, folding knife cylinder 5 and folding flap cylinder 7, are again at the same speed.

A particularly advantageous construction of the drive device by applying the measures of the invention is that the folding flap cylinder 7 is driven via a drive device 13 which is driven intermittently. In this case, the driving force is introduced into the folding knife body 5 from a drive gear 15 (not shown in detail) via a bevel gear 14 and via a worm screw 16 with different pitches and a drive gear meshing with this worm screw. Roller 17t-
It is transmitted to the index plate 18 via the index plate 18.

This indexing plate 18 meshes via a gear 19 with a gear 20 which drives the folding flap cylinder 7.

As a result, the receipt of the signature 6 is sometimes carried out between the two cylinders 5 and 7.
are driven at the same speed, ie completely synchronously, and then a reduction in the speed of the folding flap cylinder 7 takes place in order to be able to carefully transfer the signatures from the folding knife cylinder 5 to the folding flap cylinder 7. Subsequently, due to the different pitches of the worm screw 16, the speed of the folding flap cylinder 7 is increased again, so that the next signature take-up is provided with the same speed for the operation. The diameter of the folding flap cylinder 7 is advantageously smaller than the dimension calculated for the same circumferential speed.

Effects As described above, according to the present invention, damage to signatures can be avoided even when the machine is operated at high speed.

FIG.

DESCRIPTION OF SYMBOLS 1... Folding device, 2... Former, 3... Rolling paper, 4... Sewing machine roller pair, 5... Folding knife body, 6
... Signature, 7... Folding flap body, 8... Perforating needle, 9... Folding knife, 10... Folding flap, 1
DESCRIPTION OF SYMBOLS 1... Impeller, 12... Folding cylinder pair, 13... Drive device, 14... Bevel gear, 15... Drive gear, 16
... Worm screw, 17... Taking roller, 18...
・Index plate, 19.20...gear

Claims (1)

Claims: 1. A drive device for a folding device having at least one folding knife cylinder (5) and a folding flap cylinder (7), in which the driving device for the folding flap cylinder (7) (5), but with a pulsating speed, the folding knife cylinder (5) and the folding flap cylinder (7) are driven synchronously in relation to the folding knife cylinder (5), but with a pulsating speed.
), and then the folding flap body (7) moves from the folding knife body (5) to the signature (6).
1. A drive device for a folding device, characterized in that the speed of the folding flap cylinder (7) is reduced during the withdrawal of the folding flap cylinder (7). 2. The diameter of the folding flap cylinder (7) is kept smaller than that calculated on the basis of the same circumferential speed of this folding flap cylinder (7) and of the folding knife cylinder (5); A drive device for a folding device according to claim 1. 3. The folding flap cylinder (7) is driven by the folding knife cylinder (5) via an intermittently driven drive (13), which drives a worm with different pitches. It is equipped with a screw (16), on which the entraining roller (1
7) is engaged with a drive device for a folding device.