DE3034675A1 - DEVICE FOR REGULATING THE TRAIN TENSION OF A GOODS TRAIN - Google Patents

Description

Device for regulating the web tension of a material web

10

The invention relates to a device for regulating the web tension of a material web, which is of a with a brake cooperating role is unwound and fed to a processing machine, in particular a paper web fed to a web-fed rotary printing press, with a pendulum roller which Is arranged freely rotatable on a swivel frame, which can be swiveled on the machine frame by means of a pendulum shaft is stored and supported thereon by means of a spring and through which the roller is assigned Brake can be operated.

ORIGINAL IhJSPECTED COPY

i-ε. -

In the known arrangements of this type, the frame-side support of the swivel frame is carried out by means a compression spring usually designed as a spiral spring. Such spring elements require a relatively steep spring characteristic to provide the necessary supporting force within small pendulum movements to raise. However, the steep spring characteristic leads to relatively large fluctuations the web tension. Counterweights have also been used to support the pendulum roller. In this case, however, it is very difficult to set the desired web tension precisely.

Proceeding from this, it is therefore the object of the present invention, while avoiding the disadvantages of known arrangements to create a device of the type mentioned at the outset, in which not only one extensive Ensuring uniformity of the web tension, but also an exact adjustability is possible.

The solution to this problem "succeeds according to the invention in a surprisingly simple manner in that the pendulum wave has a coaxially arranged bore which is penetrated by a torsion bar spring, which with one end is attached to the machine frame and the opposite end to the pendulum shaft.

Here, the entire width of the machine is advantageously available to accommodate the torsion bar spring. As a result, a very long spring with a relatively gentle spring characteristic can be used find, so that the web tension fluctuations that still occur within a very narrow web width lie. Due to the soft spring characteristics

COPY

results from setting the required spring preload a relatively large travel, which has a positive effect on the accuracy that can be achieved. Nevertheless, the torsion bar spring used according to the invention is a comparatively inexpensive component represents what has a beneficial effect on the prime costs. The accommodation of the torsion bar inside the pendulum shaft also results in a very space-saving and compact design.

In an expedient further development of the higher-level measures, the torsion bar spring can each have one at its ends Have bend and hereby engage in a respectively assigned groove of an assigned spring holder. These measures result in a secure form fit between the torsion bar spring and in a very simple manner Penholder.

To set the desired spring preload you can The spring holder on the frame is expediently arranged coaxially to the pendulum shaft and rotatable in the machine side wall mounted bolt be formed, which can be adjusted with a means of an adjusting device The swivel arm supported on the machine frame is provided and, on the spring side, one of the spring crankings is assigned Has groove.

Further expedient refinements and advantageous developments of the superordinate measures result can be found in the following description of an exemplary embodiment with reference to the drawing with the remaining subordinate claims.

In the drawing show:

Figure 1 is a side view of the device according to the invention and

FIG. 2 is a front view of the arrangement according to FIG. Partially in section.

The tension of a paper web unwound from a roll and fed to a printing machine is usually controlled by the fact that the role is more or less braked. For this purpose, the role carrier is in itself in a known manner provided with a brake which interacts with the roller core. Applying the brake takes place via a 'web tension scanning, in the figures at 1 indicated pendulum roller to the, how Figure 1 can best be seen that the paper web 2 is looped around and its movement is converted into a brake actuation movement. To the Guide rollers 3 are provided to guide the paper web. The arrangement and design of the roller carrier and the Brakes cooperating with the roller are known per se and therefore do not require any further explanation more. The drawing is therefore limited to the brake actuation device.

The pendulum roller 1 is freely rotatably mounted on a swivel frame 4 which, as best shown in FIG can be seen, consists of a pendulum shaft 5 and attached to it, the pendulum roller 1 receiving arms 6 consists. The pendulum shaft 5 is in turn freely rotatable on the side walls indicated at 8 by means of the bearing housing 7 of the machine frame stored. Is laterally next to the arms 6 receiving the pendulum roller 1 the pendulum shaft 5 is provided with a rocker arm 9, which in a manner not shown here to the brake

be articulated actuating linkage of the roller brake

target. The pendulum roller wrapped around by the paper web 2

ze 1, or the pendulum roller 1 receiving pivot j

frame 4 is contrary to the result of the web tension;

resilient force on the machine frame. i

For this purpose, the pendulum shaft 5, as can also be seen in FIG. 2:

NEN can be provided with an axial bore 10, in the! a torsion bar spring 11 is used, the one hand

on the pendulum shaft 5 and on the other hand on the machine;

stell is clamped. The torsion spring 11 is in the loading \ rich between its ends with attached centering j

rings 12 provided, which is a coaxial position of the
Ensure torsion bar spring 11 with respect to bore 10.

In the illustrated embodiment, the torsion bar is j

spring 11, as Figure 2 further shows, in the area ι

their ends each provided with a bend 13, j

which each between two walls of a feather shark;

ters 14 and 15 intervene what a simple and j

still results in a stable form fit. The wave-side j

Pen holder 14 can simply be inserted into the bore 10 of the j

ι pendulum shaft 5 inserted bolts be formed, j

to form one of the bend 13 of the torsion bar; tongue 11 associated groove 16 on the tongue side fork-shaped

is trained. In the illustrated embodiment
is the bolt forming the spring holder 14 through two
Pins 17 are rotationally locked on pendulum shaft 5. The frame-side spring holder 15 is to achieve an adjustability of the desired

Spring preload as rotatable in a wall reinforcement
18 mounted bolt formed, the spring side
is provided with a groove 19 receiving the associated bend 13 of the torsion bar spring 11.

ORIGINAL INSPECTED

The bolt forming the rotatably mounted spring holder 15 is provided with a lateral extension 20, on which, as can best be seen from FIG. 1, a swivel arm 21 is clamped. At this Swivel arm 21 is articulated to form an adjusting device, an adjusting screw 22, which on the other hand is supported on a projection 23 of the machine frame. In the illustrated embodiment is the pivot arm 21 is provided with a rotatably mounted pin 24 through which the adjusting screw 22 passes is, which is freely rotatably supported on the frame projection 23. By turning the adjusting screw 22 the pivot arm 21 is adjusted and thus the rotatably mounted spring holder 15 rotates, which leads to a twist the torsion bar spring 11 and thus leads to the desired spring preload. The 'proportionally soft spring characteristics of the torsion bar spring 11 allows a very precise setting in an advantageous manner. For this purpose, the pivot lever 21 is a Fixed pointer 25, which cooperates with a mounted on the adjacent frame wall 8 scale 26. The maximum deflection of the pendulum roller 1 is limited by a stop 27 provided on the frame, which cooperates with stop tabs 28 fastened on the arms 6 of the swivel frame 4.

A particularly preferred exemplary embodiment of the invention is explained in more detail above, without that there is, however, a limitation associated with this. So it would be, for example, to accomplish a positive engagement of the torsion bar spring 11 in the respectively assigned frame-side or pendulum-shaft side Spring holder also conceivable, the torsion bar spring 11 in the area of its ends with a

to provide fangs- or _o Stxrnverzahnung that of the respectively assigned, preferably engages a sleeve formed spring holder in an associated internal toothing. In such an embodiment, the torsion bar spring 11 can expediently be reinforced in the area of its ends receiving the teeth, which can be achieved, for example, by upsetting.

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Claims (6)

Claims 10 15 1) Device for regulating the web tension of a web of material that is unwound from a roller interacting with a brake and fed to a processing machine, in particular a paper web fed to a web-fed rotary printing machine, with a pendulum roller, which is arranged freely rotatable on a swivel frame, which by means of a pendulum shaft pivotably mounted on the machine frame and supported thereon by means of a spring and through which the brake assigned to the roller can be actuated, characterized in that the pendulum shaft (5) has a coaxially arranged bore (10) through which a torsion bar spring (11) passes with one end on the machine frame and with the opposite end on the pendulum shaft. 2) Device according to claim 1, characterized in that the torsion bar spring (11) has a bend (13) "at its ends and thereby engages in an associated groove (16 or 19) of an associated spring holder (14 or 15). 3) Device according to claim 2, characterized in that ' the shaft-side spring holder (14) is designed as a bolt which is firmly connected to the bore (10) of the pendulum shaft (5) and which is in the area of the bolt in the bore (10 ) protruding end face is fork-shaped. 4) Device according to claim 2 or 3, characterized in that the frame-side spring holder (15) arranged as coaxially to the pendulum shaft (5), .15 rotatably mounted in the machine side wall Bolt is formed, which is adjustable by means of an adjusting device on the machine frame supported pivot arm 21 is provided and on the spring side a'die associated spring crank (13) has receiving groove (19). 5) Device according to claim 4, characterized in that the adjusting device is designed as an adjusting screw (22) articulated to the pivot arm (21) and supported on the frame side, to which a scale (26) and a pointer (25) attached to the pivot arm (21) are assigned is. 6) Device according to at least one of the preceding claims, characterized in that the torsion bar spring (11) in the area between the clamped ends with at least one centering ring (12) is provided, which has movement play relative to the bore (10) of the pendulum shaft (5). 7} Device according to claim I _1, characterized in that the torsion bar spring (11) is reinforced in the area of its ends and is provided with a toothing in each case in the area of these reinforcements, which are inserted into an assigned internal toothing of a respectively assigned, preferably designed as a bushing spring holder (14 or . 15) intervenes.