DE1235048B - High-speed printer system - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. α .:

G06k

German class: 42 m6 -15/06

Number: 1235 048

File number: P 28965IX c / 42 m6

Filing date: March 12, 1962

Opened on: February 23, 1967

The invention relates to high speed drum type printers and, more particularly, relates to timing wheels and the associated circuitry for such high-speed printers.

In the field of electronic computing devices, it is often necessary to have a wide variety of information Kind of print out. As the electronic computing devices at very high speeds work, printing devices that can be used in conjunction with such computing devices should also be able to operate at high speed. In general, allow it High speed printers of the type to which the invention relates, ten or more lines of information in the second to print. Used with a high-speed printer suitable for this operating speed a type drum, and each character position within a line is a separate print hammer assigned. The type drum carries on its circumferential surface for each character position within the line a wreath of characters. The sheet to be printed is between the print hammers and the type drum passed through. If a line with 20 characters is to be printed, you can see thus proposing a drum carrying 20 sets of types; here each set of types forms one the drum arranged wreath each containing one of all the different characters to be printed; furthermore, 20 print hammers are arranged in a row parallel to the drum axis so that they the Facing the drum. The drum is rotated continuously at a secondary speed, which is equal to the number of lines to be printed per second; for example, the drum makes in everyone Ten revolutions second to print ten lines every second. The print hammers will in each case actuated at the moment in which a certain character to be printed corresponds to the relevant Print hammer faces. The print hammer is activated when input information, that require a certain sign in a certain place, with the presence of the relevant character on the drum opposite the print hammer at the required character position coincide.

The essential components of a high-speed printer of the type described above include a clock wheel, which is used to determine the positions of the various characters on the type drum, while the drum rotates when the high-speed printer is operating. The clock wheel can be attached to the type drum or with a high-speed printer system

Applicant:

Potter Instrument Company, Inc.,
Plainview, NY (V. St. A.)

Representative:

Dr.-Ing. F. Wuesthoff, Dipl.-Ing. G. Pulse
and Dr. E. v. Pechmann, patent attorneys,
Munich 9, Schweigerstr. 2

Named as inventor:

Charles H. Doersam Jr.,

Port Washington, N.Y. (V. St. A.)

Claimed priority:

V. St. v. America April 26, 1961 (105 763)

be suitably coupled to her. Since the determination of the character position requires the greatest possible accuracy arrives, the clock wheel is usually on one and the same with the drawing drum Arranged shaft. One known high-speed printer system uses two timing wheels and three scanning heads to provide a clock pulse for each type position and for each new drum revolution a start or reset pulse between two consecutive clock pulses to generate the time-dependent actuation of the print hammers opposite the type drum be fed to a timing control circuit. This known high speed printer system has as a result of Using several scanning heads has the disadvantage of a very high manufacturing price, since a scanning head, which must be carried out very carefully for the intended use, only with high Costs is to be produced.

The invention is based on the object of creating a high-speed printer system, the production price of which is at least half smaller than that of known high-speed printer systems, which is before especially with regard to the series production of such high-speed printers for calculating machines Meaning is.

709 510/276

I 235 048

3 4

According to the invention, this object is thereby achieved by impulses indicating the position of the characters solved that the provided on the clock wheel of the work signal generating with a magnetic resistance Elements are arranged so that the scanning head 11 whose signals they can be scanned by a single scanning head winding 12 via lines 13 and 14 to a syn- and that the time control circuit for the time-dependent 5 chronologically working signal oscillator 52 and via Lei actuation the positions 33 and 34 opposite the type drum to a control unit 35 Print hammer a signal separation circuit is pre-closed. The clock wheel 5 is suitable with is connected, in which the clock pulses from the start pulse generating elements, e.g. B. incisions 15, or reset pulses are separated. 16,17,18 etc., provided that when walking past

The signal-generating elements will cause the scanning head 11 to generate signal pulses expediently through incisions or teeth on the winding 12. With the exception of the clock wheel formed in such a way that an incision 17 associated with the start signal is provided for each of the various characters distributed over the circumference of each of the other incisions 15, 16, 18 etc. speaks to the drum circumference. with regard to its location of a certain row of In addition, an additional incision or tooth 15 characters on the type drum 1. If z. B. 20 is provided, which is used to generate the start or back rows of printing types on the peripheral surface of the actuating pulse. If there are drum 1 on the type drum, the clock wheel 5 has spaces not occupied by characters, twenty corresponding incisions and one additional incision for the start signal can be found on the clock wheel. Leave out in front of tooth or incision. One can use a 20 lying case, corresponding to the slot 15 of the series oscillator, which normally by the clock generator on the drum, which is synchronized in each ring of character wheel impulses, which contains the letter B, to generate the slot 16 missing pulses which when passing the series of letters C etc.
the gap does not appear. In this way, in FIG. Figure 2 is an end view of the clock wheel 5 again generating an accurate time stamp signal. 25 shown, wherein the from F i g. 1 visible parts of each

Appropriately, there is that immediately because they are designated with the same reference numerals,

to one of the end faces of the type drum. Furthermore, FIG. 2 at 53 and 54 indicated that

closing clock wheel in a manner known per se, certain incisions may be missing, since the

with the type drum in one piece. talking points on the type drum free

The signal isolation circuit can have a locking gate and 30 spaces. So there is one for everyone an AND gate, which is so de-clocked by one of the characters on the circumference of the drum 1 synchronized control circuit speaking point a pulse generation incision can be controlled that the clock pulses by the only available that delivers a pulse which is in the Locking gate open during its duration and the comparison and control stage 35 is evaluated. A Reset or start pulses are generated by the oscillator 52 Duration of the clock pulses generated closed AND gate, which is derived from the location of the characters be synchronized, speaking impulses, and the

The invention will be seen in the following with reference to the time stamp clock is the comparison and control stage

matic drawings on several execution 35 via lines 31 and 32 supplied. The supply

examples explained in more detail. 40 the information signals are fed in via an input

F i g. 1 is a schematic representation of an output line 36. The evaluation of the time stamp

embodiment of the invention; signals, character position signals and information

FIG. 2 is an end view of an invention signal takes place in stage 35 in a known manner

appropriate clock wheel; Way.

F i g. 3 shows as a block diagram a circuit which 45 for separating the back to the incision 17

to recover the start signal are used to supply the start or reset signal from the

can; composite pulse signal can be used in

F i g. 4 shows a set of timing diagrams, FIG. Use the circuit shown in Figure 3. That together-

to explain the operation of the invention set pulse signal is used as the input signal

serve according to arrangement; 50 input 19 and a switch-off lock 20 and above

F i g. 5 is a perspective partial illustration of a line 21 fed to an AND gate 28,

modified embodiment of the invention. This signal has the in FIG. 4 on line A

In Fig. 1 one recognizes a type drum 1, on the reproduced form and comprises the pulses C, E, the circumferential surface of which has several rows of printing G. H. K etc. If no blocking is arranged in the form of a ring. The drum 1 55 line 26 of the delay multivibrator 25 is suitably connected, e.g. B. by means of a motor 2, apparent signal occurs, these pulses pass rotated, the electrical energy from a not the lock 20 here and arrive via a line 22 ta shown source is supplied and the one with an output 23, where they are used as time stamp signals verTrommel is coupled by a shaft 3. Are on applies or where she is in the presence of the other end of the drum shaft 4 a pre ^6o vacancies on the type drum serve saw that led to synchronize the position of the sign indicating the time stamp generator. The clock wheel 5 carries. The printing with the help of the delay multivibrator 25 is done with the signal drum on a suitable sheet or line connected by a line 24 and so from sheet 6, z. A pressure-sensitive paper, and formed to be effected in response to each input by a series of print hammers, 65 pulses for a predetermined period of time one of those in FIG. 1 is indicated at 7; to be switched. During the switch-on time, actuation of the print hammer 7 provides a winding 8, the output of the delay multivibrator 25 which is connected to supply lines 9 and 10. The speaking of the line B in F i g. 4 an and lock

I 235

signal via line 27 and a switch-off lock signal via line 26. Thus, for each character position pulse C, E , etc., periods D, F, J, L , etc., during which the lock 20 is closed, while the AND lock 28 is a pass signal is fed. The normal character position signals C, E, H, K etc. pass through the switch-off lock 20, because they occur while the multivibrator 25 is switched off, and for the same reason they do not pass through the AND-lock 28. However, since the start or reset pulse G occurs during the switch-on time of the multivibrator 25, it passes the AND lock 28 and appears in the line 29 as a reset signal that can be taken from the output 30, while this signal does not pass the switch-off lock 20. In this way, the character position signals and the start or reset signals can be separated from the composite signal. As already mentioned, time stamp signals can be generated as a function of the character position signals, and this has shown how all three signals can be derived from a single clock wheel that works with a single scanning head.

F i g. Figure 5 shows a modified embodiment of the invention in which the incisions or the take place this in FIG. 5 teeth shown as fixed components of the type drum are provided in the same way are like the print types. In Fig. 5 you can see timing teeth 46, 41, 43, 44, 45, etc., and this one A ring of teeth extends over the entire circumference of the drum supported by a shaft 51 39. At 42 an additional tooth is provided for generating the reset or start pulse; this tooth lies essentially in the middle between the normal timing teeth 41 and 43. The Scanning head 40 is arranged on a suitable support piece 47 which, with the aid of slots 48 and 49 can be adjustable with respect to a frame part 50. This adjustment is provided so that a accurate calibration of the timestamp pulses can be performed while the drum is rotating.

Claims (3)

Patent claims: 1. High-speed printer with a rotatable type drum and one with the type drum synchronously rotating clock wheel, which is provided with signal-generating elements, by means of which for the time-dependent actuation of the print hammer opposite the type drum a time control circuit for each type position a clock pulse and for each new drum revolution a start or reset pulse between two consecutive clock pulses are available, characterized in that the signal-generating elements (15 to 18; 41 to 46) are provided on the clock generator wheel (5) that they are supported by a single scanning head (11,12; 40) can be scanned, and that of the timing control circuit (35) a signal separation circuit for the time-dependent actuation of the print hammers (7) opposite the type drum is connected upstream, in which the clock pulses are separated from the start or reset pulses. 2. High-speed printer according to claim 1, characterized in that it is directly connected to a the end faces of the type drum subsequent clock wheel in a known manner with the Type drum consists of one piece (Fig. 5). 3. High-speed printer according to claim 1 or 2, characterized in that the signal separation circuit a lock gate (20) and an AND gate (28) so selected from one of the clock pulses synchronized control circuit (25) controlled that the clock pulses by the only during their duration open locking gate (20) and the reset or start pulses by the during the duration of the clock pulses closed AND gates (28) are passed. Considered publications:
U.S. Patents Nos. 2,805,620, 2,906,200,
919 967. 1 sheet of drawings 709 510/276 2.67 © Bundesdruckerei Berlin