DE1233633B - Feed device for recording media in start-stop operation - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. α .:

G06k

German class: 42 m6 -13/00

Number:
File number:
Registration date:
Display day:

S71716IXc / 42m6
December I, 1960
2nd February 1967

The invention relates to a device for advancing recording media from a continuously rotating shaft from a friction clutch and a lockable in stopping positions Ratchet wheel, the pitch of which corresponds to two minimal characters for the rotation of the feed shaft and whose controllable pawls are effectively offset against each other by half a ratchet tooth pitch are.

Record carriers, e.g. B. with high-speed printers the form of 20 and more centimeters wide Paper tapes are supposed to work very quickly with electronic computing devices, for example and yet with individually retrievable steps in the size of a simple division or an integer Multiples of it can be funded. The recording media can of course also use the In the form of strips or tapes, for example punched tapes, have.

It is known for such a recording medium to have one continuously via a friction clutch Provide rotating shaft drivable feed shaft, which is an electromagnetically lockable Column wheel carries.

In such feed devices, it is when they are at a very high walking pace, for example should work with 200 steps per second, it is difficult to determine the rise or fall time of the To measure the electromagnet so precisely that with certainty only one feed to z. B. a tooth pitch, the minimum line spacing for high-speed line printers or for high-speed scanning of punched tape correspond to a row of holes is achieved.

The invention is based on the object of providing a recording medium of the type mentioned at the beginning As quickly and silently as possible, either by a minimum division or by any multiple this division, in particular by twice the amount, start-stop-wise or also in the run to be able to promote.

It is true that one already has one for the steady, step-by-step feed of film strips Device created in which a controlled by the driving shaft oscillating armature to two half a ratchet pitch offset acting pawls for the one that can be driven via a spring clutch Wave carries. But these pawls cannot be operated independently of each other. Continuous run is also not possible. The device according to the invention is characterized in that two separate, independent of one another in on feed device for recording media in the Start-stop operation

Applicant:

Siemens Aktiengesellschaft, Berlin and Munich, Munich 2, Wittelsbacherplätz 2

Named as inventor:

Dr.-Ing. Hans-Jörg Tafel, Aachen;

Dipl.-Ing. Erich Eißfeldt, Munich

As is known, electromagnetically actuated pawls are provided.

In this way, for example in the case of a known unlocking by means of an electromagnetic armature suit, the fall times spread much more than when only a single electromagnetic locking device is arranged.

A further development of the invention is characterized by a pre-settable binary counting chain in Connection with gates, a flip-flop and amplifiers as well as a controlled by the feed shaft, the number of teeth of the ratchet wheel adapted to the clock.

This makes it possible for a start-stop operation to perform, for example, is fast so be switched in a simple manner that step sizes between half a pitch up - divisions possible

where χ denotes the capacity of the meter used.

An embodiment of the invention is described below and shown in the drawing. In this case, a feed shaft 1 for the line-by-line paper feed is in one of a data processing unit Device-controlled high-speed sheet printer provided. With such printers it is in many If desired, the line spacing can be either a minimum or a whole To be able to set multiples of it and, in addition, also a fast feed to a

709 507/176

to allow the correct number of lines. In order to be able to achieve line feed times of the order of magnitude of 5 to 10 ms per line without having to place extremely high demands on the control magnets, the feed shaft 1 can be driven by a continuously running shaft 3 via a slip clutch 2. For the desired start-stop movement, two electromagnets 4 and 5 together with a ratchet wheel 6, which is fastened to the feed shaft and designed as a ratchet wheel, are decisive. In this case, the electromagnet 4 has an immediately effective as locking and release pawl of armature 7 and the electromagnet 5 a similar anchors 8. The anchor are tied by a respective spring 9, 10 in their fallen position in which they rest against the ratchet. 6 The teeth 6 a of the ratchet wheel have a pitch which corresponds to an advance of the recording medium by two minimum pitches. In the position shown, the ratchet wheel is prevented from advancing by the armature 7 of the electromagnet 4. The armature 8 engages in the ratchet wheel 6 offset by 3V2 tooth pitches with respect to the armature 7. The electromagnet 5 is not excited in the case shown.

If only one electromagnet such. B. denoted by 4, step by step are briefly excited, the ratchet 6 would be pivoted by one tooth pitch and so that the recording medium can be advanced by two minimum pitches. To the The electromagnets are alternately used for recording media to advance a minimum division excited. Only the rise or fall times need to be shorter, but not both times than the feed time for a paper division. To increase safety, it is advisable to reduce the tightening time make it greater than the fall time. In the case of multi-cell feed, both Magnet armature attracted; the required magnet armature must then fall off within a tooth pitch.

In the following, an electronic circuit is described that allows the actuation steps for single and multi-cell feed to be controlled. For this purpose, two amplifiers V1 and V2 are provided, the first of which is in the circuit of the electromagnet 4 and the second in the circuit of the electromagnet 5. Both amplifiers are controlled by a K flip-flop. A binary counter Z, which can be switched on by five switches S , which in turn can be controlled, for example by scanning tape, is used to set the desired number of line divisions to be advanced. The number of lines fed is scanned by a slotted disk 11, which is fastened on the feed shaft 1, with the aid of a photodiode 12 and a lamp 13. The pulses from the photodiode are fed to a pulse shaper /.

If the recording medium is to be advanced by one division, the binary counter Z must be set to the largest possible binary number, a five-digit counter rather than Hill. Two blocking gates Gl and G 2, which are connected to the two antiphase outputs of the first stage of the binary counter, are thus set so that gate Gl is blocked and gate G 2 is open. A trigger pulse, which triggers the line circuit after a line has been printed, acts via the line ^ through the open gate G2 on the flip-flop K, which thus controls the two amplifiers Vl and F 2 in such a way that the excitation of the electromagnet 4 switches on and that of the electromagnet 5 is switched off. The ratchet 6 and thus the feed shaft 1 continue to rotate by half a tooth pitch; the recording medium is thus advanced by one line. The trigger pulse simultaneously sets the binary counter Z by advancing one digit from 00000. As a result, the previously open gate G 3 is blocked by the last counter stage and the counting pulse that now comes from the photodiode 12 according to the feed scan cannot affect the amplifiers Vl and V2 .

To advance the recording medium by two lines, the binary counter must be set to 01111 in a corresponding manner. The trigger pulse then comes through the now open gate Gl to the common inputs of the amplifiers Vl and V 2, whereby the respective non-excited magnet is briefly attracted and falls into the next tooth. With the first incoming feed scanning pulse, the counter, which has already been switched from the trigger pulse to Hill, is reset to 00000. With an even selection of line feed steps, the first counter level is always set to 0, so gate G 2 is blocked; the next trigger pulse can then not activate the flip-flop K. The feed shaft 1 is therefore stopped by the previously blocking magnet, so that only feeds by even-numbered - here two-line - line divisions can take place.

In the case of multi-cell feed, the binary counter Z is preset in such a way that it passes through the required Number of lines is set to 0. Until this point in time, gate G 3 remains open, both amplifiers so keep both magnets excited to release the ratchet 6 of the feed shaft 1. Depending on, Whether an even or an odd number of lines is to be advanced, the selection of the blocking line is made Magnets according to one of the two options described above.

The actuation of the pawls of the ratchet wheel 6 can also be carried out in other appropriate ways take place. If necessary, more than two, for example three, preferably designed as electromagnets Locking devices may be provided, with the associated switching pawls in each case z. B. a third of the tooth pitch offset against each other are effective.

Claims (3)

Patent claims: 1. Device for feeding recording media from a continuously rotating shaft via a friction clutch and one in stopping positions Lockable ratchet wheel, the tooth pitch of which is two minimum steps of rotation corresponds to the feed shaft and its controllable pawls by half a ratchet tooth pitch are effective offset from one another, characterized in that two separate, independent of one another in an In a known manner, electromagnetically actuated pawls (7, 8) are provided. 2. Feed device according to claim 1, characterized by a presettable binary counting chain in connection with gates, a tilting stage and amplifiers as well as a controlled by the feed shaft, the number of teeth of the Switching wheel adapted clock (11 to 13). 3. Feed device according to claim 2, characterized characterized in that the binary counting chain corresponds to one of one for example from a memory tape existing scannable program can be preset. Considered publications: German Patent Specifications No. 233 165, 1041524; »AWF-Getriebhefte«, Issue 3/1957, p. 7. 1 sheet of drawings