DE8016735U1 - DEVICE FOR LENGTH CUTTING MATERIALS - Google Patents

Description

I I I << «4 * 1 ·

1141 «« « It · «* * **

Patent attorneys Elan.Bröndalröm.StrBQe 1 + 3

D-rtöOO Blelolold 1

D.pi.-ing. Bodo THIELKING

Talolon. fOSaO 60621 + 63313

Dipi, mg. Otto ELBERTZHAQEN _{Telex: 932O59 anwll d}

PoslaoheokKohlo; Wan 3O9193 Anwallaäklenielchsn: 1 2 06

Date: June 20, 198C

Sign in Maschinenfabrik Stahlkontor Weser Lenze KG, Hans-Lenze-Strasse 1, 3251 Aerzen 2

Device for longitudinal cutting of material webs

The invention relates to a device for longitudinally cutting material webs according to the preamble of claim 1.

In known devices of this type, the upper knives are each individually freely rotatable and can be used for cutting be lowered onto the material web. The upper knives themselves are not driven but are driven by the material web driven when cutting. This principle cannot be used for all material webs.

Longitudinal cutting devices are therefore already known in which one or more pairs of knives on separate, jointly driven knife shafts sit. The adjustment with these jointly driven cutter shafts, the knife pairs cannot be made continuously during operation be / but for an adjustment of the knife pairs to set new web strip widths must Production to be interrupted - to the lower and upper knives

, ti i I · «· ·

111 »I <I I I · <· · ·

«I« ti * ···

Mil III "· ·· ··

12 069a 20 «June 1980

set to the desired new web strip width in a complex assembly process «

Finally, longitudinal cutting devices are known (DE-PS 12 22 784), in which, although the pairs of knives during the Can be adjusted transversely to the web width, but with these constructions the driven upper knife si

Bi cannot be removed up to a desired safety distance for pulling in the material web. Introducing [; ' the web of material in such known constructions is particularly dangerous.

The invention is therefore based on the object of improving a device of the type mentioned in such a way that Continuous adjustment across the width of the web without interrupting the drive of the top and bottom during operation Lower knife and also a change in the distance between the axes of the knives interacting in pairs are possible is"

This object is achieved with the characterizing part of claim 1.

The device according to the invention combines the advantages of all previously known different construction principles without having their disadvantages. She allows during the Operation allows the strip width to be adjusted continuously and also allows the material webs to be pulled in easily. When pulling in the material webs, the driven upper knife can up to a sufficient safety distance of the lower knife are pivoted, so that in this process the earlier particularly critical risk of injury Operators is practically excluded.

«111 It I III

4 ι ι ι ι ι

I I I I I I

MM HI ti ti

12 069a June 20, 1980

Preferred embodiment air shapes of the invention are in the sub-sewing spray heights and the foreground description below. In the drawing show:

Figure 1 - a section through part of the device with the upper knife folded down,

Figure 2 - a side view of the device shown in Figure 1,

Figure 3 - a plan view of an arrangement of several, one behind the other set up devices for Cutting a web of material into several individual strips.

An upper cutter 2 is attached to an upper cutter shaft 1 which is rotatably mounted in an intermediate piece 5. The upper knife shaft 5 carries a gear 10c at one end. About the gear 10c, the gear 10b, the gear 10a and the gear the rotary movement of the upper cutter shaft 1 is coupled to the rotary movement of the lower cutter shaft 3.

The intermediate piece 5 is mounted on the shaft 9 so as to be pivotable about the pivot axis 9a. The pivot axis 9a of the shaft 9 is at the same time the axis of rotation of the gear 10b. When the intermediate piece 5 is pivoted about the pivot axis 9a the gear 1Cc runs on d ^ m gear 10b.

On the side of the shaft opposite the gearwheel 10b, a plate 22 is screwed tight by means of a connecting screw 23. The plate 22 carries a limiting pin 8, which in the illustrated embodiment in a blind hole 5a of the Intermediate piece 5 engages *

An adjusting lever 6 is mounted on the intermediate piece 5 so as to be pivotable about the axis 6a. The adjusting lever carries a pressure roller 7, which when pivoting against the inside of the plate

I t ""

• ·

1 ** 4

I I 1 I # · «

12 069a 2O _{June 4} , 1980

applies. With a further pivoting in the direction of the arrow 23 according to Figure 1, the return spring / which is on the one hand on the intermediate piece 5 or a doutiit fixed bush and on the other hand supported on a carrier 11, compressed. As soon as the blind hole 5a releases the limiting pin 8 / can Hand lever 6 with the intermediate piece attached to it is pivoted into a plane running perpendicular to the upper cutter shaft from the position shown in Figure 1 to the position in which the upper knife 2 is dash-dotted is shown. In this position, the limiting pin 8 plunges into a further, not shown, blind hole in the pivotable intermediate piece 5.

The carrier Ί1 is on the two sliding bars 12 and 12 '(cf. Figure 2) stored, which extend transversely to the web of material. The adjustment takes place by means of the adjusting spindle 13 or by means of the hand wheel 13a. The adjusting spindle 13a is shown offset in FIG. 1 for a better overview.

The adjusting spindle 13, the sliding bars 12 and 12 'and the Drive spindles 16 are mounted in frame 20. From the drive spindle 16, which can be driven for example by means of an electric motor, not shown, is the drive movement is transmitted to a sprocket 15 and from there to the sprocket 14 by means of a chain, not shown, which is non-rotatably connected to the gear 10 and rotatably mounted on a shoulder of the lower cutter shaft.

From Figure 2 two Ümlenkwellen 17 and 18 can be seen over the one material web 21 is guided / which is to be cut into strips.

From Figure 3 it can be seen that many of the devices described are arranged one behind the other in the web direction can, both in mirror image and offset behind

12 069a June 20, 1980 |

- 5 - I.

each other.

Instead of adjusting the upper knife by means of the mentioned adjusting lever this adjustment can also take place via other drive elements, for example pneumatic actuating cylinders.

The described arrangement of the limiting pin 8 and the blind hole 5a initially takes place before the pivoting axial offset of the upper knife 2. This axial movement is necessary in order to move the upper knife to the lower knife avoid touching the knife.

Claims (9)

1. Device for longitudinal cutting of material webs, in particular of plastic, paper and nonwoven webs, with circular knives designed at least once, in pairs cooperating lower and upper knives that work on different Knife shafts are arranged, with a first knife shaft adjustable from the cutting position of its knife and the second, driven knife shaft is rotatably mounted in a carrier that is connected to this knife shaft and the knife attached to it is displaceable transversely to the width of the web, characterized in that that the first cutter shaft (1) is driven and mounted on the carrier (11) via an intermediate piece (5) which consists of the Engagement position of the knife (2; 4) can be pivoted out. 2. Apparatus according to claim 1, characterized in that the pivot axis (9a) of the intermediate piece (5) coincides with the axis of rotation of an intermediate wheel (10b) that controls the rotary movement of a knife shaft (1) transfers to the other knife shaft (3). 3. Apparatus according to claim 1 or 2, characterized in that in the intermediate piece (5) the knife shaft (1) of the upper knife (2) is mounted. 4 «device according to one or more of claims 1 to 3, characterized / that between 2 - • * »ι» · »J J j , ■ ti · 11 I! t ^r ' O69 _a June 20, 1980 piece (5) in the engagement position of the knife (2; 4) lockable and for unlocking in the direction of the Pivot axis (9a) is slidably mounted. 5. Device according to one or more of claims 1 to 4, characterized in that one Return spring (19) is provided, which on the one hand on the carrier (11) and on the other hand on the intermediate piece (5) and holds the intermediate piece (5) in the locking position corresponding to the engagement position of the knives. 6. Device according to one or more of claims 1 to 5, characterized in that the Intermediate piece has an adjusting element (6) for its displacement from the locking position. 7. Device according to one or more of claims 1 to 6, characterized in that the The adjusting element is an adjusting lever (6) which can be pivoted about a lever axis extending transversely to the pivot axis (9) (6a) is mounted on the intermediate piece (5) and which is in the actuated position on a part fixed to the carrier ^ 22) supports. 8. The device according to one or more of claims 1 to 7 , characterized in that the Ilesserwellen (1; 13) each carry a gear (10 or 10c) at their ends which mesh with two intermediate gears (10a and 10b), wherein the axis of rotation of one intermediate wheel (10b) coincides with the pivot axis (9a) of the intermediate piece (5). 9. Apparatus according to claim 8, characterized / That the gear drive is a spur gear.