DE204268C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

■ - Jig 204268 CLASS 54 d. GROUP

The invention relates to Vorrichtμngen for cutting through endless paper webs to selectable lengths. The device is intended in particular for machines Folding of Leporello blocks are attached, in order to separate the Leporello blocks after folding a selectable number of block sheets. The cutting knife is for this purpose - as with

lo. knew such machines in a groove of one of the guide rollers for the endless Paper web attached and is in a known manner after any number of times the circulation Guide roller eccentrically moved out over its surrounding area in order to enter a narrow groove penetrate the second guide roller and thereby cut the paper web transversely.

The invention is in the special choice

the means used to regulate the activity of the knife. As' special Advantages of the invention results in the most convenient setting for any length of paper, unconditional Reliable in effect and great durability.

1 and 2 of the accompanying drawings show the device in section along line AB of FIG. 3 with different positions of the knife. Fig. 3 shows the device in elevation. FIG. 4 shows individual parts causing the knife to protrude, seen from the left of FIG. 3.

Of the two rollers 2 and 3 giving guidance to the paper web 1, the latter is in the usual way provided with a narrow longitudinal groove, the entry of the knife. cut allowed when cutting through the paper web. The roller 2 has a longitudinal groove 4 of greater width and depth to accommodate the knife clamp 5 and the same clamped knife 6. The axis 7 of the knife clamp is eccentric to the roller axis with their end pins in disks 8 fixed in front of the two ends of the roller 2 (Fig. 3) stored. Outside the disk 8, a lever arm provided with a roller 9 is seated on the shaft 7 10. A spring 11 influences the lever arm 10 in the sense that the knife clamp 5 with the knife between the individual cutting operations assumes the inclined position shown in Fig. 1, in which the knife edge is located within the circumference of the roller 2. On the shaft 12 of the roller 2 sits displaceably e; n Lifting thumb 13. With two screws 14, the thumb 13 is a forked releaser 15 connected, which is also the locking lever. The screws 14 penetrate with their end pin into the hub of the thumb, whereby the latter is secured against rotation will. Above the releaser 15 is a ratchet lever 16, 17 on the machine frame rotatably mounted about the axis 18. A tension spring 19 pulls the lever arm 17 upwards. At the A stop lug 20 sits at the end of the lever arm 17 Rotation of a disk 21 rigidly connected to a worm wheel on this fixed driver 22. This driver can also be attached directly to the worm wheel be. The worm wheel is driven by one seated on the shaft 12 of the roller 2 Screw 23 set in rotation. The gear ratio is chosen so that the

Claims (2)

Worm wheel always makes one revolution, while roller 2 one of the number of Blades of a block executes the corresponding number of revolutions. Worm and worm wheel are interchangeably attached, so that in the most convenient way each for the respective desired number of block leaves suitable transmission ratio can be produced. - A compression spring 24 is inserted between the thumb and the frame. With each revolution of the worm wheel or the one with the same or with it Shaft rigidly connected disk 21, the driver 22 arrives in the one shown in FIG. 3 Position. With further rotation of the worm wheel, the driver 22 moves through ■ would take the lever arm 17 downwards of the stop 20, the ratchet hook 16 rising up the releaser 15 releases. The driver 22 revolves in a circle, the radius of which is much smaller than the distance between the stop lug 20 of the ratchet lever 16, 17 and the pivot point 18 of the latter. As a result, the driver slides soon after the pawl lever is triggered 16.17 from the stop lug 20. The . The compression spring now pushes the thumb 13 against the roller 2, so that it is in the area of rotation of the roller 9 of the lever arm 10 comes. As soon as the roller 9 comes into the area of the lifting point of the thumb 13, If the arm 10 is pressed outwards, the knife is in the cutting position shown in FIG receives. After the cut has been made, the roll leaves 9 - the lifting point of the thumb 13 again, so that the arm 10 · and the knife 6 under the In the course of the spring 11 again that shown in FIG. 1 Received position. A stuck on the end plate 8 of the roller 2 arrives inclined ramp 25 in front of a roller 26 of the releaser 15, whereby the latter, in the in Fig. 3 position shown is pushed back, in which his nose 27 behind the lower the action of the spring 19 standing locking hook 16 snaps into place. The thumb becomes 13 now held by the releaser 15 in the disengaged position until after folding one a certain number of blocks the worm wheel made one full turn again Has. To transfer the movement of the roller axis 12 to the driver 22 can of course any gear train can be used if the driver is on its own rotatable shaft or is firmly attached to a disc that is firmly seated on this. Of the The driver can then remain in place permanently while switching on Intermediate gears on displaceable shafts change the ratio in the widest possible limits. Godfather ν T-A N Proverbs: ι. Cutting device for cross-cutting paper webs to selectable lengths with a knife swinging eccentrically out of the longitudinal groove of one of the guide rollers over its circumferential surface in adjustable time segments, characterized in that a displaceable thumb (13) is located on the shaft of the guide roller (2) equipped with the knife (6). is provided, which can be triggered by a locking lever (15) designed as a releaser and one in selectable time segments by a rotating driver (22). Locking hook lever (16, 17) from the orbit of an arm (10) of the shaft (7) of the knife holder (5) and held back by a spring (24) after releasing the locking hook (16) in the path of a roller (9) of the arm ( 10) is indented so that the thumb (13) causes the knife (6) to swing forwards by lifting the roller (9) against the action of a spring (11) acting on the arm (10), while an on the roller (2 ) seated, sloping _{ramp (25) passing a roller go} (26) of the locking lever (15) pushes the thumb (13) out again so far that the nose of the locking lever (15) can snap into place behind the locking hook. 2. Cutting device according to patent claim i, characterized in that the triggering of the pawl lever (16,17) by a during its rotation against a stop lug (20) of the pawl lever (16, 17) pushing driver (22) is effected, which in a circle orbits, whose radius is smaller than the distance between the stop lug (20) of the latch lever (16, 17) and the rotary point _lo g. 1 sheet of drawings.