DE1024053B - Three-knife cutting machine for paper, cardboard or the like. - Google Patents

Description

GERMAN

The invention relates to a three-knife cutting machine for paper, cardboard or the like. With two at the same time effective side knives and one in the movement sequence of the cutting process by about 180 ° to these offset Ouermesser as well as with a driving the knives at their ends via tie rods Main shaft.

It is known in such machines that the outer knife and the side knife during a work cycle staggered in time from a single-turn shaft using a half-gear transmission to drive. For this purpose, a larger number of drive wheels as well as locking and control devices are required necessary, the manufacture and assembly of which is cumbersome and expensive.

There are also drives for three-knife cutting machines known, in which the knife movement or the temporary shutdown of the knife by means of Control curves is made. Such cam gears take up a considerable amount of space heavy in construction and also expensive to manufacture.

The invention is therefore based on the object of providing a drive for three-knife cutting machines create that easy by eliminating all entangled parts, such as half gears, locking elements and curves as well as being cheap to manufacture and clear and undemanding to maintain.

Appropriately, the single-tour wave is at both ends a crank with a crank pin and each tie rod at one end a double-armed lever mounted on the machine frame, the other end of which is linked by push rods is articulated with the respectively assigned crank pin, the double-armed Lever in connection with the cranks and push rods designed and arranged in such a way are that the cutting stroke of the one. Knife genus the other superior knife genre each one executes practically imperceptible overstroke.

This overstroke of the knife movement has no adverse effect on the machine, if it is very is small.

In order to keep the overstroke very small, the drive linkages are designed in such a way as to that the double-armed lever with respect to the vertical longitudinal center plane of the main shaft to both of them Pages are arranged and that the two lever arms of the double-armed, via tie rods with the Ouermesser connected levers at an acute angle to each other and the two lever arms of the double-armed, connected via the tie rods to the Seitenumesscrii Levers are arranged in a straight line, in such a way that with upright knives the over the scliub-

Three-knife cutting machine for paper,
Cardboard or the like

Applicant:
VEB paper processing machine plant

PERFECTA,
Bautzen (Sa.), Schäfferstr. 44

Walter Mitschke and Erich Fröhlich, Bautzen (Sa.),
have been named as inventors

rods with the; Crank pin connected to the main shaft Lever arms and the cranks parallel to each other and the second lever arms with the articulated tie rods approximately in the area of their extended position are.

An embodiment of the subject matter of the invention is described below and in FIG Drawing shown schematically. It shows

Fig. 1 is a side view of the three-knife cutting machine and

Fig. 2 is a tangential path diagram.

The knives are driven by a single-turn shaft 6 which is driven in a known manner and rotates in the direction of the arrow. At. the ends of the single-turn shaft 6 are each a crank 7 with a crank pin 8, on which a push rod 9 and a push rod 10 engage. Each thrust rod 9 is connected via a two-armed, pivotable about a fixed bearing 13 drives lever 11, 11 α and a "pulling rod 3 with a side cutter. 2 Each push rod 10 is connected to a two-armed drive lever 12, 12 a pivotable about a fixed bearing 14 and via a pull rod 5 to the outer knife 4,

The drive flags 11, 11a or 12., 12 a are included designed such that the tie rods 3 and 5 with the articulated thereon. Levers 11a and 12a of the drive lever in the dead center position of knives 2 and 4 move in the area of the extended position ;. Fig. 1 shows when the machine is at rest, the position of the drive linkage in strongly drawn lines. That Material 1 to be cut is first cut by the side knives 2, then by the outer knife 4. According to the structure of the drive linkage leads the high-standing knife genus with the drive linkage shown in dotted lines during the

709 S79 / 5

Claims (2)

Section of the other knife genus with the drive linkage drawn in each case with dashed lines has a slight overstroke üq or Üs that is not visible from the outside of the casing of the machine. Fig. 2 shows the course of movement of the otter knife 4 (strongly drawn curve) and the side knife 2 (weakly drawn curve) during a work cycle of the machine. Pa τ ε nt τ λ χ s ρ η ν c η κ: 1. Three-knife cutting machine for paper. Cardboard or the like with two simultaneously effective side knives and an outer knife offset by about 180 ° to this in the course of movement of the cutting process and with a main shaft driving the knives at their ends via tie rods, characterized in that the main shaft has a crank with a crank at each end Has crank pins and each pull rod is articulated to one end of a double-armed lever mounted on the machine frame, the other end of which is articulated by push rods to the respectively assigned crank pin, the double-armed lever being designed and arranged in this way in operative connection with the cranks and push rods are that after the cutting stroke of one type of knife, the other high-standing knife type in each case executes a practically imperceptible overstroke.
2. Dreimesserschneidemasehine according to claim 1, characterized in that the double-armed levers are arranged with respect to the vertical longitudinal center plane of the main shaft on both sides and that the two lever arms (12 and 12a) of the double-armed, via tie rods (5) with the outer knife (4) connected levers at an acute angle to each other and the two lever arms (11 and 11 ß) of the double-armed, via the tie rods (3) with the side knives (2) connected levers are arranged in a straight line, so that with upright knives the over the push rods (9 and 10) with the crank pin (8) of the main shaft connected lever arms (il and 12) and the cranks (7) parallel to each other and the second lever arms (lla and 12a) with the articulated tie rods (5 and 3) approximately in the area of their Are in the extended position. Considered publications:
German patent specification No. 310 208. 1 sheet of drawings