DE2259988A1 - DEVICE FOR REDUCING THE TYPE SPEED DURING THE PRINTING PROCESS WITH FAST PRINTERS - Google Patents

Description

SIEMENS AKTIENGESELLSCHAFT Munich, December 7th, 1972 Berlin and Munich Witteisbacherplatz 2

72/2171

Device for reducing the type speed during the printing process with high-speed printers.

The invention relates to a device for reducing the type speed during the printing process in the case of a high-speed printer in which the type carrier rotates continuously.

Mechanical high-performance printers usually work on the principle of printing on the fly, i.e. the type flies past the pressure point, so it is for the approach. print hammer impact time not stopped. This is disadvantageous for both front and retro printers because of fluctuations in the point of impact Drawing errors and smudges occur due to the finite duration of contact with the print hammer. It would be about that desirable if the type would stand still while the print hammer was in contact.

In order to achieve this, it is known to move the type carrier intermittently rather than continuously. To this The purpose of drum printers is the uniform, mean rotational movement of the drum axis, a torsional vibration superimposed. As a result, there are times when the drum axis stands still or almost stands still. At these times the printing process must then be carried out. To-! Part of this process is that the generation of the intermittent movement of the type drum requires a great deal of effort

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requires mechanics. In addition, it cannot print at very high speeds can be achieved because the type drum has to be stopped and accelerated again and again.

The object on which the invention is based is therefore to provide a device through which the reduction the type speed during the printing process with high-speed printers without great effort and without reduction the printing speed is possible. This object is achieved in that the type carrier is resiliently suspended is so that it is movable perpendicular to the hammer impact direction is that an arrangement is provided which moves the type carrier in an oscillating manner and thus the continuous one Type movement superimposed an oscillating movement.

Each type of printing that comes into the printing position is thus once continuous by the drive means of the type carrier moves and, on the other hand, leads through the resilient suspension of the type carrier parallel to the direction of movement ~ the type of printing in the printing position emits an oscillatory vibration. The superposition of the continuous movement of the Printing type and the oscillating movement results in a relative standstill of the printing type to the print hammer certain times. The printing process must then take place at these times.

The device according to the invention can be used both in drum printers and in chain printers.

Further developments of the invention emerge from the subclaims.

The invention is further explained with the aid of exemplary embodiments which are shown in the figures. Show it:

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Fig. 1 shows a basic representation of the invention

moderate device in a drum printer, Fig. 2 the application in a chain printer, 3 shows the application in a push-link printer.

In Fig. 1, the type carrier consists of a type drum TR. The type drum TR rotates in the direction of arrow 1 continuously around its axis A. There are print hammers H opposite the type drum TR. is marked with the arrow 2. The type drum TR is resiliently suspended on its axis A. This is in FIG. 1 shown in principle by the spring FT, which is attached to the housing M and to the axis A of the type drum. By the resilient suspension of the type drum TR can swing the type drum in the directions of the arrows 3. The direction of oscillation is perpendicular to the direction of impact. In the case of the printing types on the type drum TR that are running in the printing position, the continuous ones are thus superimposed Movement in direction 1 and the oscillating movement in direction 3 · This means that there are times when the print type based on the hammer impact direction is stationary or has only a small relative speed. At this point in time the printing process must then be carried out.

. 4th

In Fig. 2, a type chain TK is used as a type carrier. The direction of movement of the individual type elements the type chain is marked with the arrow 4, the hammer impact direction of the hammer H is shown by arrow 6. The type chain TK is via springs FT1 and FT2 attached to the housing M. Due to the resilient mounting of the type chain TK, it can oscillate in one direction of arrows 5. Here, too, two movements are superimposed on the types of printing in the printing position, namely the direction of movement of the type links and the oscillation vibration of the type chain TK. There are times when

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which the type of printing, based on the direction of impact of the hammer stands still or has only a small relative speed. The direction of oscillation of the type chain TK is vertical to the direction of impact of the hammer.

With the help of a special arrangement it can be ensured that the type carriers move in an oscillating manner. That can e.g. by means of a mechanical control element, e.g. a camshaft or an eccentric. But it is also possible to set the type carrier in oscillation with the help of a magnetic vibration transmitter.

The oscillation frequency of the type carrier must be chosen so that it matches the clock frequency of those passing by Types at the printing point. In order to get by with small energy for the excitation of the oscillation, must the suspension can be constructed in such a way that the natural resonance frequency of the type carrier approximates the oscillation frequency matches.

Since the oscillation of the type carrier could interfere with the overall function of the printer, it is conceivable that a corresponding counter-phase oscillating counterweight to compensate for the vibrations.

Fig. 3 shows how a push link, chain or tape printer the standstill of the printing types can be achieved at the moment of printing. The individual type carriers TT run in a fixed type guide, e.g. the type carriers TT are pushed in one direction by a gearwheel. In addition the shaft of the gear is driven by a drive motor AM. The rotary motion of the drive shaft will a torsional vibration with the help of a vibration coupler SK superimposed. The movement of the drive shaft is transmitted to the individual TT type carriers, which are in the direction of

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move the arrow 8, but vibrations in the direction of arrows 7. The compensation for the vibrations caused by the vibrating type carrier is automatic here achieved because the type carriers on the back oscillate out of phase with those on the front.

In the exemplary embodiments, it is only shown in principle how the device according to the invention is used in different types Type carriers can be executed. It is assumed that the printers are constructed in a known manner and only are additionally provided with the device according to the invention.

5 claims
3 figures

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Claims (5)

Claims f 1.) Device for reducing the type speed during the printing process in a high-speed printer, in which the type carrier is continuously moved, thereby characterized in that the type carrier is resiliently suspended so that it is perpendicular to the direction of impact of the hammer is movable that an arrangement is provided which moves the type carrier in an oscillating manner and thus the continuous. an oscillating movement superimposed on animal type movement, 2. Apparatus according to claim 1, wherein the type carrier from a type drum, characterized in that the type drum (TR) is so resilient is suspended that it performs an oscillatory movement perpendicular to its axis under the influence of the arrangement. 3. Apparatus according to claim 1, in which the type carrier consist of a type chain, characterized in that the type chain (TK) is so resiliently suspended is that, under the influence of the arrangement, it has an oscillating movement parallel to the pressure side of the type chain executes. 4. Apparatus according to claim 1, in which the type carrier is made up of type links, a type chain or a type band consists, which run in fixed guides, characterized in that the type carriers (TT) given by the arrangement of an oscillating movement parallel to the direction of movement of the types will. VPA 9/210/2056 - 7 - 409824/0550 5. Apparatus according to claim 2 or 3, characterized in that that to compensate for the shocks caused by the oscillation of the type carrier a balance weight is provided which oscillates in phase opposition to the type carrier. VPA 9/210/2056 409824/0550 I. e (ί ι s e i 1