DE2420841B2 - Cutting device for recording media or the like - Google Patents

Description

The invention relates to a cutting device for recording media od. The like. According to the Preamble of claim 1.

Cutting devices of various types can already be proven to be previously known. For example, according to US-PS 37 28 920 a cutting device for recording media for in booking and data processing systems of rolls or leporello-shaped stacks of a printing station fed endless papers is described, the ^4S cutting device consists of a fixed knife and a movable knife and the movable knife in Direction of movement is designed as a V-shaped design. In practice, this cutting device has a number of significant disadvantages ^V), in that this cutting device inevitably and due to its complex construction, provides a relatively long and time-consuming stroke of the knife, furthermore the knife stand time must be set very low, and ^r ' ^r > Finally, the insertion of the recording medium requires laborious threading.

In contrast, the object of the invention is to propose a generic cutting device through which a relatively short and ^w) energy-saving stroke of the knife is achieved, the knife service life is increased and the recording medium can be inserted without laborious threading.

This is achieved by the features of claim 1 ^.

In the following the invention will be described in more detail with reference to the drawings. Here shows in a schematic representation

F i g. 1 the side view of the cutting device.

F i g. 2 the top view of the knife in the direction of the arrow /! According to FIG. 1,

3 shows the view of the movable knife in the direction of the arrow θ according to FIG. 1.

According to FIG. 1, the cutting device consists in a known manner of a generally stationary one Knife 1 and a movable knife 2, with the recording medium between the two knives 3 by means of friction rollers or in Randlöc'.ier engaging transport devices in the vertical direction is promoted. At least two levers 4 are arranged on the knife 2, which levers on a swing arm 5 mounted axis 6 are pivotably arranged. On the pivotable about the fixed axis 7 Swings 5 are advantageously rollers 8 as attachments to fixedly arranged on the axis 9 Cam disks 10 are provided, with a secure contact of the rollers 8 on the cam disk 10 by means of Spring or counter-curve is achievable.

For the purpose of inserting a recording medium 3 into a data output device not shown in detail the printer is opened by pressing the button shown in FIG. 1 front part 11 of the data output device indicated by dash-dotted lines, in which, for example, the push button, also not shown, and the pressure rollers a transport device and the stationary knife 1 are arranged in parallel in the direction of arrow 12 is pulled forward while the movable knife 2 remains in the fixed part of the device, so that the Cutting device is separable in the plane of the recording medium 3 and offers enough space to with the hands to grasp the recording medium 3 comfortably and in a simple manner in its not shown Insert leadership. After the front part 11 has been returned, the recording medium is by means of the transport device held and the push button and the fixed knife 1 are in their Basic positions.

After a form has been printed, the latter is then used as a covering for the continuous web of the recording medium 3 truncated programmatically as follows:

When driving the axis 9 with the cam 10, the rocker 5 is about the axis 7 against the Pivoted clockwise and the lever 4 with the knife 2 in a straight line in the direction of arrow 12 to the front, in the Fig. 1 to the left, moved. The lever 4 slides by means of its curved guide 13 on a guide axis 14 until the front pin 15 arranged on the knife 2 at a height distance of, for example Cover the fixed knife 1 by several millimeters, as shown at 15 'in FIG. 1. At the Further pivoting of the rocker 5 lowers the lever 4 with the knife 2 by sliding off her Curve guide 16 on the guide axis 14 until the knife 2 with its front pin 15 on the The cutting edge of the knife 1 is resting. This state is shown in phantom in FIGS. 1 and 2 Position 15 ″ illustrated. Only when the now resting on the knife 1 is moved further Knife 2 is due to the in Fig. 2 in the direction of movement of the latter recognizable V-shape of the knife 2 of the recording medium 3 cut from its side edges towards the middle until the Position 15 '"is reached. The tension springs 17 shown in FIGS. 1 and 3 do not only do that

3 4

of the knife 2 on the knife 1, but rather the recording medium clean, smooth cut edges

perpendicular to the cutting direction and in the middle and the knife stand times thanks to self-sharpening

; s of the knife 2 as in FIG. 3 shows fungus increased. The backward movement of the knife 2

The air gap caused by manufacturing tolerances then takes place in the reverse order to the one above

; lichen and thus across the entire breadth of: the process described.

1 sheet of drawings

Claims (2)

Patent claims: 1. Cutting device for recording media od. DgL for in booking and data processing systems of rolls or leporello-shaped stacks of a printing station fed continuous paper, the cutting device consists of a fixed knife and a movable knife and the movable knife is provided as a lifting knife and the cutting edge of the movable knife having a V-shape in the cutting direction of movement, characterized in that the fixed knife (1) according to the data output device is forward to be drawn from the front part (11) arranged, while the movable blade (2) remains device part in the solid ^'5, and that in the movable knife (2) by means of the action of tension springs (17) perpendicular to the cutting movement direction, towards which the stationary knife (1) is bent in the middle. 2. Cutting device according to claim 1, characterized in that 2 » characterized in that the movable knife (2) driven by a rocker arm (5) by means of a Curve guide (13, 16) of a lever (4) on a guide axis (14) initially in a straight line in one specified distance above the horizontal 2> cutting plane of the fixed knife (1) in Direction of arrow (12) is movable and only after covering the fixed knife (1) through front pin (15) of the movable knife (2) with these pins (15) on the fixed knife (1) «' is lowerable.