Method and device for drawing-in a material web

A web of material is drawn into a printing press. A part of the tip of the web, which is laterally projecting over the edge of the web, is separated lengthwise at least once by the use of a slitting device. A device for accomplishing the drawing in of the web is also disclosed.

FIELD OF THE INVENTION

The present invention is directed to a method and to a device for drawing-in a web of material. A start of a web tip, which extends laterally of the web, is cut off.

BACKGROUND OF THE INVENTION

It is known from DE 196 21 507 C1 to draw paper webs into web-fed rotary printing presses. Paper web draw-in devices are used for this purpose.

DE 26 57 789 A1 describes a device for drawing-in a paper web. A draw-in tip of the web is cut off a draw-in mechanism by a cutting device at the side of the longitudinal former.

SUMMARY OF THE INVENTION

The object of the present invention is directed to providing a method and a device for drawing-in a web of material.

In accordance with the present invention, this object is attained by providing a start of the web tip which is extending laterally past an alignment line of one of the lateral edges of the web. This start of the web tip is cut off the web draw-in assembly. This cut-off start can be grasped by a conveying system and removed. A strip may be cut between the draw-in assembly and the web. A cutting arrangement to accomplish this can be situated upstream of a former roller or on an end of a driveable web guide roller. A disposal station can be provided to dispose of the cut-off start.

The advantages to be gained by the present invention consist, in particular, in that, following the automatic draw-in of a web of material, the fastening assemblies, for example a formed-on paper tip, are automatically cut off the draw-in mechanism, which may be, for example a draw-in chain, at a preselectable location of a machine, which machine may be, for example, a web-fed rotary printing press.

The cut-off of the paper web draw-in tip from the paper web takes place at a fixed location, for example at a combining roller which is located upstream of the entry of the web of material into a former. The draw-in speed can be increased.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

A guide roller01, for example a paper guide roller01, is seated or supported on both ends in spaced lateral frames02,03, as seen inFIG. 2. The left end04of the paper guide roller01which has a barrel length “a” is rotatably seated in the lateral frame02by the use of a shaft journal06, while the right end07of the paper guide roller01has an extended shaft journal08, which is supported by the use of bearings09, for example by the use of roller bearings09, in a sleeve11, which sleeve11is, in turn, seated fixed in the right lateral frame03and is arranged coaxially with relation to the shaft journal08. With its end12remote from the guide roller01, the sleeve11projects from the lateral frame03and supports a gear wheel13. The end14of the shaft journal08, which is remote from the roller01also projects out of the sleeve11and is connected, fixed against relative rotation, via a bushing16, with the driveshaft17of a motor18, which motor18may be, for example, an electric motor18. The motor18is flanged to the exterior of an outer housing19, which outer housing19is fastened on the outer side of the lateral frame03that is remote from the roller01.

A longitudinal cutting arrangement21is located outside the barrel length “a” and on an end, such as the right end07, of the paper guide roller01. This longitudinal cutting arrangement21consists at least of an upper cutter22, for example a circular cutter22, which upper cutter22is fastened on a driveable cutter shaft26extending axis-parallel with the shaft journal08and seated in the lateral frame03, as well as in a wall23of an inner housing24which is fastened on the inner side of the lateral frame03; i.e. the side of the lateral frame03close to the roller01.

A cutting edge of the cutter22works together with a lower counter cutter27, for example in the form of a cutter ring located on the end of the sleeve11which is close to the roller01.

While the paper guide roller01can be permanently driven by the motor18via its shaft journal08, the upper cutter22located on the shaft26, as well as the counter cutter27arranged on the sleeve11, can also be driven by the provision of a controllable coupling28, for example a magnetic coupling28.

The controllable coupling28is located inside the outer housing19between a cutter shaft gear wheel29, fastened on the shaft26, and a coupling gear wheel31, which is rotatably seated on the shaft26. The coupling gear wheel31meshes with a bushing gear wheel32arranged, fixed against rotation, on the bushing16. All of the various bearings used in this assembly are identified by09.

The mode of functioning of the longitudinal cutting arrangement21depicted inFIG. 2is as follows:

The paper guide roller01is driven when the motor18is switched on. The bushing gear wheel32, which is fixed on the bushing16, rotates simultaneously with the paper guide roller01, and meshes with the coupling gear wheel31, which can freely rotate on the cutter shaft26. After the coupling28is engaged, the cutter shaft26, with the upper cutter22, is caused to rotate. At the same time, torque is transmitted from the cutter shaft gear wheel29, which is fixedly arranged on the cutter shaft26, to the sleeve gear wheel13which is fixed on the sleeve11, so that the lower counter cutter27is also driven and moves along.

The engagement of the coupling28can be caused by a sensor, which is not specifically represented. A switched-on time of the coupling28can be limited.

The longitudinal cutting arrangement21, or the paper guide roller01with the longitudinal cutting arrangement, is arranged, viewed in the production direction, for example upstream of a former inlet roller of a former, so that the paper guide roller01is used as the combining roller for webs of material33,34,36,37, for example paper webs33,34,36,37, entering into the former, as may be seen by referring toFIG. 1. In the course of a web draw-in process, the paper webs33,34,36,37each reach the paper web guide roller01at different times by operation of a draw-in mechanism39, shown inFIG. 3, and which may be, for example, a finite driven roller chain39, guided, for example, in a common guide rail38fixed on the lateral frame03. Each one of the several paper webs33,34,36,37has on its leading end or tip a fastening assembly41, for example a glued-on or formed-on paper web tip41, whose start59projects laterally past a lateral or side edge42, or laterally past an alignment line61of the lateral edge42of the paper webs33,34,36,37. This paper web tip start59also extends past the area of the barrel length “a” of the paper guide roller01. The start59of the paper web tip41is fastened to an extended chain bolt lug or connecting fixture43of the roller chain.

If now the paper web tip41reaches the now coupled-in and therefore driven longitudinal cutting arrangement21, an element or segment46of the paper web tip41, which element or segment46is delimited by the generated cutting line44represented in dash-dotted lines and which element or segment46is fastened to the chain bolt43, is cut longitudinally, i.e. in the production direction, off the paper web tip41and is removed by continued operation of the roller chain39.

The cutting line44of the cutter22and the counter cutter27extends outside of the paper webs33,34,36or37and in close vicinity of the web lateral edge42, as seen inFIG. 3. It is also possible to employ a belt system as the draw-in mechanism39.

In accordance with a second preferred embodiment of the present invention, a second upper cutter47, as depicted inFIG. 2, is arranged remote from the roller01on the cutter shaft26at a distance “c” from the first upper cutter22. This second upper cutter47cooperates with a second lower counter cutter48located on the sleeve11. The second upper cutter47and the second counter cutter48are embodied analogous to the previously described first cutter22and first counter cutter27.

Following the arrival of a paper web tip41at the longitudinal cutting arrangement21in accordance with the second embodiment, an approximately trapezoidal strip49is cut out of the paper web tip41by the driven longitudinal cutting arrangement21, which strip49is delimited longitudinally by the cutting line44of the first cutter22and the first counter cutter27, as well as by the cutting line51, created by the second cutter47and the second counter cutter48and with cutting line51extending parallel in respect to cutting line42and being represented by dash-dotted lines, as may be seen inFIG. 3.

The cutting lines44,51run in such a way that neither the lateral edge42of the paper webs33,34,36,37, nor the chain bolt43are damaged.

In accordance with a third preferred embodiment, this strip49, or the element or segment46, which is fastened to the draw-in mechanism39, can be removed from the draw-in mechanism39by two endless conveying or belt systems52,53, as seen inFIGS. 2 and 3, which belt systems52,53grip, or clamp the strip49, or the element or segment46, and convey it to a disposal station54, for example. The disposal station54can consist, for example, of an aspirating device with an upstream connected comminuting device, which is not specifically represented.

One of the strands of the conveying or belt systems52,53is guided between the first cutter22and the first counter cutter27, or the second cutter47and the second counter cutter48, as shown inFIG. 2, and each belt system52,53runs over deflection rollers55,56, as well as through drive and tightening stations57,58, respectively.

The gear wheels31,32of the drive mechanism of the longitudinal cutting arrangement21are dimensioned in such a way that the circumferential speed of the first upper cutter22and the first counter cutter27and of the second cutter47and the second counter cutter48are different, by up to approximately 10%, from the circumferential speed of the paper guide roller01.

The starts59of the paper web tips41can be separated one after the other and in any arbitrary sequence from the paper webs33,34,36,37.

In accordance with a fourth preferred embodiment of the present invention it is also possible to generate a cutting line44with the first cutter22and with the first counter cutter27and to strip the element or segment46of the paper web tip41, which is now only fastened on the chain bolt43, off the chain bolt43. Stripping off of the element or segment46can be performed by passing the chain bolt43over an up ramp, which rises as far as the free length of the chain bolt43and which is fixed in place on the lateral frame.

While preferred embodiments of a method and device for drawing in a material web, in accordance with the present invention, are set forth fully and completely hereinabove, it will be apparent to one of skill in the art that various changes in, for example, the type of web being drawn-in, the drive for the draw-in mechanism, the types of bearings used, and the like could be made without departing from the true spirit and scope of the present invention, which is accordingly to be limited only by the appended claims.