DE1561153C3 - Device for adjusting the roller spacing on folding machines - Google Patents

Description

The invention relates to a device for adjusting the roller spacing on folding machines for sheets of paper with at least two stationary mounted in the machine frame and at least one opposite them adjustable folding roller pressed by spring pressure against the stationary folding rollers.

With folding machines it is necessary to adjust the folding rollers to the thickness of the sheets passing through. For this purpose there is a wide variety of designs, which are used with adjusting wedges in connection with inclined bearings, or with levers and adjusting screws, or with thrust levers and adjusting wedges, or with threaded spindles work with adjusting nuts suspended bearings. Such a device is by the DT-PS I 098 966 known.

The disadvantage of these known adjustments is that the folding rollers to be set are in a straight line or in an arc with a larger radius than the Folding roller moved away, thereby shifting the WaI-Zcnmittc to the next folding roller and the one previously set Distance is no longer correct. This disadvantage is particularly evident when folding zigzag folds; because the folding rollers must be set to a certain paper thickness, but while depending depending on the number of folds made so far, pass through up to 9 or even more paper thicknesses. Through the straight or slightly curved evasive movement, the folding roller is only available for the next fold in working position when this evasive action has ended and the folding roller is in again due to the spring pressure their set position has come. This is also the reason why zigzag folds are over difficult or impossible beyond a certain number.

Different, depending on the design of the different Adjusting devices, there are also other disadvantages such as:

The lower folding rollers are not rigidly mounted, which increases the number of Sicllclemente.

The folding rollers all drive against each other. whereby the driving forces of the lower rollers and consequently the holding down spring force is great. what the necessary evasive movement of the folding roller opposes.

If there are more than 4 folding rollers, the number of one-setting elements is so large that they are no longer in one plane can be accommodated, whereby a larger construction of the machine is required.

The invention is based on the object of folding machines of the type described above in which ίο Sheets are processed with different thicknesses in the direction of passage, due to a different number of sheet layers is caused to achieve an exact fold, with a on a certain sheet thickness set distance between stationary folding roller and adjustable folding roller independent of an adjacent one Folding is largely retained.

This object is achieved according to the invention in that the adjustable folding roller (c) is mounted in a four-bar linkage (1, 2, 6, 7) fixedly mounted in the machine frame with its first hinge point (8). where the opposite second pivot point forms the bearing of the adjustable folding roller (c), so that the third (4) and fourth (5) pivot point in the zero position of the four-bar linkage (I, 2, 6, 7) on the axis lines of the first (« - /) and second (6) stationary folding roller lie, and that the distance between the stationary folding rollers (<;, b) and the adjustable folding roller (c) by means of adjustable rotation of a first (6) or second (7) lever of the four-bar linkage (1, 2, 6, 7) around the first hinge point (8) can be achieved.

The following advantages are achieved:

The lower folding rollers are rigidly mounted.

Each upper folding roller is circular in 2 directions around the fixed folding roller below or in movable according to the set distance. The folding rollers are set from the outside by placing them under them the corresponding number of paper strips of the paper to be folded between 2 setting surfaces.

There is a possibility of correcting the set distance from zero to plus and minus. .

An adjustment option for the folding rollers in the zero position and a readjustment option when it has occurred Wear is given.

Each fixed folding roller drives only its associated loose folding roller.

The spring pressure on the loose folding rollers can be low. All folding rollers can be in roller bearings to run.

An exemplary embodiment of the invention is explained with reference to the drawings. It shows

F i g. 1 shows a side view in section AB of FIG. 2,

F i g. Figure 2 is a front view of the adjustment device.

In the exemplary embodiment 3 folding rollers are shown, two of which -, 7 and b - read and the roller ^ can be adjusted with respect to the rollers a and b.

For this purpose, the bearing point of the folding roller c

of two half-shell levers 1 and 2, which are in the zero position are offset by 90 ° to each other to V4 of the circumference and is by means of a Screw compression spring 3 pressed into the same.

Levers 1 and 2 are at pivot points 4 and 5

movably attached to the levers 6 and 7, the center of the hinge points 4 and 5 in the zero position coinciding with the axes of the fixed folding roller.cn; / and b .

The two levers 6 and 7 are rotatably mounted on the machine frame in pivot point 8 so that they are in Vcr-

link with levers 1 and 2 to form an equal-armed, movable four-bar linkage.

Again at the distance of the folding roller diameter is on the levers 6 and 7 by hinge pins 9 and 10 each a ram head 11 and 12 articulated, in each of which one Push rod 13 and 14 is screwed in and locked with a nut.

The threads of the push rod heads and push rods in conjunction with the lock nuts are used to set the folding roller c in its zero position relative to the folding rollers a and b.

Due to the spring 3 acting from above, the push rods 13 and 14 are each on a movable one on the Folding unit wall attached measuring blocks 15 and 16, which in turn are on the measuring surfaces of the cube bearings Support 17 and 18.

In the bore of the cube bearings 17 and 18 is rotary

bar mounted the very slightly eccentric correction screw 19, which is fixed on the machine wall attached bolt 20 is seated.

If the measuring block is lifted on the ball handle provided and a number of paper strips corresponding to the desired distance is clamped between the measuring surfaces, the spring 3 rises against the spring pressure over the push rods and push rod heads 11 to 14 and the levers 1, 2, 6, 7 Folding roller c from the underlying fixed folding roller a by the same amount, whereby it moves in a circular arc around the fixed folding roller b or a.

If one or the other folding roller is to be set tighter or looser depending on the folding result, can this can be done at the correction screw 19 according to plus or minus.

1 sheet of drawings

Claims (1)

Claim: Device for adjusting the roller spacing on folding machines for paper sheets with at least two stationary folding rollers mounted in the machine frame and at least one adjustable folding roller that is adjustable against the stationary folding rollers by spring pressure, characterized in that the adjustable folding roller (c) is in one with its first pivot point ( 8) in the machine frame fixedly mounted quadrangle (1. 2, 6, 7) is mounted, the opposite second hinge point forming the bearing of the adjustable folding roller (c) that each of the third (4) and fourth (5) hinge point in the zero position of the four-bar linkage (1. 2. 6. 7) lie on the axis lines of the first (; /) and second (b) stationary folding rollers and that the distance between the stationary folding rollers (: i, b) and the adjustable folding roller (c) can be achieved by means of adjustable rotation of a single (6) or second (7) lever of the four-bar linkage (1. 2, 6, 7) around the first hinge point (8).