DE1774051C - Printing unit controlled by electrical code signals - Google Patents

Description

3 4

the specified angular position is reached, where it is provided up to and including the return of the type carrier

Reception of the next code signal combination Step-by-step pulses enable extraordinary

remains. Here, too, the printing speed is lent a high printing speed. If you order the

by the characters to be printed out most frequently when printing a character in the

if the necessary comparison process as well as the proximity of one or the other basic position, then

each required full turn of the type - the type carrier only needs one when printing

rades limited. relatively short distance there and back

From the German Auslegeschrift 1 100 07S it is to be moved, i. h .. that can be printed out

still already known, the type wheel of a long-distance carried out extremely quickly,

typewriter on its scope with font io An embodiment of the invention is now

to provide series of characters, which are explained in more detail in two groups on the basis of drawings in which

are divided, which shows up on opposite sides

Semicircular surfaces of the type wheel are located. The F i g. 1 is a perspective view of a push

Typewheel normally takes a rest position of the movement according to the invention,

one. which is in the middle between the two qua- 15 F i g. 2 is a perspective view of the mechanical

dranten of a group of characters is, depending on the structure of the printing unit according to Fig. 1,

which group (letters or digits) is F i g. 3 is a view of part of the mechanical

was chosen. Switching from letters to systems according to Fig. 2,

Digits and vice versa takes place with the help of a mecha- Fig. 4 ία form, a block diagram that im

Niche change-over gear, so that in particular in 20 printer of Fig. 1 used electrical system and

there is a risk of mechanical vibrations, FIG. 5 shows a part in the form of an oil circuit diagram

that the respective starting position is not exactly one of the system shown in FIG

is held so that the subsequent imprint of this part is shown in detail.

of a character is defective or faulty. Reference is now made to FIG. A

It is an object of the present invention to printer 10 is in a relatively small size reasons to have a printing unit of the type mentioned at the beginning of the housing 12 and can create a message on a paper that prints the extraordinarily high printing web 14. The paper 14 becomes line by line speeds and still always pushed out of the housing 12, and provides a flawless typeface. each character is printed one after the other. This

This task is solved by a printing unit 3 ° characters (together with control operations) of the type mentioned at the beginning, which thereby pekenn · retrieved with the help of electrical signals, which is shown that the resetting of the type carrier neither via a directly connected line, a under the control of a pedometer, wirelessly or otherwise which the number of step switching pulses are saved and received. The housing 12 carries certain with which the stepper motor is previously used for on 35 control devices 16 including a “setting of the type carrier in the printing position off” switch, a switchover control (book opening, the step counter a zero bars or digits), a carriage reset detector is assigned, which after printing the one u.

geste'iten characters the generation of a from In order to explain the device in detail, let

Contents of the step counter dependent number of 40 now referring to FIG. A cylinder Step switching pulses for the resetting of the shaped pressure element 18, which the character set 20 Type carrier caused in the starting position, and in the form of printing types for the individual characters

for setting the starting position, from which carries, is located in this device. The A-

the movement of the type carrier into the next printing individual characters can be on paper 14 or another

control takes place, coincidence circles are provided, 45 whose medium is printed. For execution

The printing element 18 will change the position of the printing process assigned to the type carrier in this way.

Lungsabtaster and controlled by setting signals arranged that a desired character under the

are and of which via the respective activated paper 14 in front of the hammer actuating device 24

Coincidence circle is the stepper motor as long as step. By energizing the device 24 is with

Switching pulses are supplied until the type carrier 50 with the aid of a hammer 26 a ribbon 28 briefly

that determined by the applied setting signal brought into contact with the paper 14, wherein

Assumes starting position. a pattern remains on the paper, which

In the printing unit according to the invention, the character 20 located in the printing position is deflected from the output corresponding to the type carrier. In other words, the desired time position in the printing position and the return 55 surfaces are printed on the paper 14. In order to bring the initial position through the characters 20 desired by the code signals in front of the hammer, derived stepping pulses, after which it may be necessary to rotate and / or move the pressure element 18 prior to each resetting operation. The shift from which the movement of the type carrier into the practical or translational movements is carried out with the next printing position, by means of step pulses 60 with the aid of a stepper motor 30, the cotation movement is carried out under control by a stepper motor 32 for the type carrier,
ordered position scanner precisely adjusted The pressure element 18 operates from a certain is. Since the respective starting position of the reference position is from and returns to this reference position after the print type carrier between successive printing processes, each step is precisely controlled and, if necessary, 65 back. In this context, any one can be set, one gets a perfect typeface even with the printing of two possible reference positions (depending on the mechanical vibrations acting on the type of characters to be printed). Which are correct for the setting, whereby the working speed

digkcit of the device can be increased considerably. The pressure member 18 sits in a bracket or slide 33, which in turn is on an elongated Splined shaft 34 runs. In this way, the shaft 34 extends in the axial direction through the organ 18. The body of the organ 18 can be moved in the manner indicated by the arrow 36. A rotational movement of the organ 18 can by rotating the shaft 34 (wedged with the organ 18) be brought about. However, the shaft 34 is freely rotatable in the slide 33. Therefore, if the spline shaft 34 rotated, the member 18 is shown in the manner indicated by the arrow 38!

Is now the rotation of the organ 18 in detail to be viewed as. The shaft 34 ends in bearing bushes 40 and 42, which are in the housing 12 (Fig. 1) are attached. The shaft 34 (Fig. 2) is driven by the motor 32 via a pulley 44, which with firmly connected to the shaft 34 and coupled to a pulley 46 via a drive belt 48 is set in rotary motion. The pulley 46 sits on a shaft 50, which at the same time is the motor shaft of the stepper motor 32. The stepper motor 32 is therefore over with the organ 18 a drive connected so that each step of movement of the motor 32 one rotation of the member 18 at 45, d. H. around an eighth, causes.

The shaft 34 also carries an octagonal dial 52 which is integral therewith. The eight distributed on the circumference of the disk 52 sides serve to a rotatably mounted arm 54, which of a leaf spring 56 is pressed to take up. It follows that the disc 52 and thus the with the shaft 34 coupled member 18 can assume eight stable positions, in each of these Positions of a printing type row 20 is on the same level as the printing position.

The disk 52 contains an opening 58 which cooperates with two photoelectric devices 60 or 62. The photographic devices 60 and 62 in turn operate with tubular ones Light guides 64 and 66 together accordingly. A light source 68 provides light to the tubular Light guides 64, 66 and 70 (known in the art) which transmit this light to the appropriate photoelectric Forward facilities 62. 60 and 72.

The photoelectric devices 60 and 62 serve to establish the reference positions of the organ 18 with respect to its rotational movement, while the photoelectric device 72 carries out the complete return of the organ 18 to the left side, which will be explained in more detail below.

The axial movements or translational movements of the organ 18 are carried out with the aid of the stepping motor 30 which pulls a rope or belt 74. The belt 74 is placed on a pulley 78 which is attached to the housing or other fixed receptacle. The belt 74 runs through the carriage 33 and is firmly connected to it. It also runs parallel to the shaft 34. Each individual step of the stepping motor 30 therefore displaces the member 18 in the axial direction by a unit of length.

In the case of a movement sequence which is in any way related to the axial movement of the pressure body 18, the stop hammer device 24 is transported by a stepping motor 80. The device 24 contains a magnet which is supplied with electrical energy via a cable 82. The magnet drives the hammer 26 against the printing type 20 on the body 18, the band 28 and the paper 14 lying between the hammer and the printing type. This is how a character is printed. The stop hammer device 24 sits on an elongated shaft 84 which is fixedly attached at its ends. The establishment

ίο 24 is also coupled to a rope or tape 86, which on a pulley 88 (driven by motor 80) and one permanently attached Pulley 90 is running. The band 86 firmly connected to the device 24 also carries a Flag 92, which has two photoclectric devices 94 and 96 (on the left and right edge attached) and two light sources 98 and 100 cooperate. The light sources 98 and 100 can tubular light guides or independent

ίο be light sources. The belt 86 runs through guide grooves in the devices 94 and 96 behind the light sources 98 and 100. The color feed device for the paper 14 also contains the belt 28, which is designed as an endless loop and is known in mathematics as the "Mocbius belt". It is constructed as a single or one-sided surface. The band 28 is made by turning one end 180 'prior to joining the free ends to form the endless loop. The belt runs in guide rollers 102, which bring it in parallel between the work wheels of the device 24 and the pressure body *.

The belt 28 is contacted and held by a drive roller 104 (connected to the drive device 106) and a spring-loaded guide roller 108 (FIG. 3). The drive roller 104 serves as a transfer roller which touches a suction pad roller 10 (also attached to the drive device 106). The suction pad roller 110 transfers ink to the drive roller 104 and thus to the belt 28. Since the belt 28 continues to move during the operation of the printing, the hammer 26 strikes the upper outer part of the belt during one complete revolution of the belt, but hits the upper outer part of the belt during the next complete revolution the inner lower part. This results from the structure as "Moebius'band". In this way, the belt 28 is worn evenly.

can be used longer and can absorb dye according to the printing area.

From the drawings it can be seen that the device places characters of the type shown by types 20 on body 13 on dr <? Paper 14

Ss prints. After each line of print is completed, a line feed magnet 112 is energized and the paper advances one line. The magnet 112 is connected to a ratchet wheel 114 by a mechanism 116 . The ratchet wheel 114 is coupled to a roller 117 from which the paper 14 is unwound.

It should now be the operation of the one shown in Fig.2 Systems are explained. During the initial energization of the device, the printer 18 becomes brought directly into one of two possible reference positions. In the present embodiment, the reference positions are selected according to whether the device is in operating condition

for »letters« or »numbers«. The Be-Irieoszusland for "Ziflcrn" can be viewed as an alternating state, as it is in an approximately analogous way can also be found with conventional telex. Should the device use an alphabetic "letter" If you print the next character, it is set to the operating status for "letters" and remains in this state as long as "letters" are to be printed. However, should a digit, a Number or any special character are printed, the device is in the operating state for "Numbers" offset.

If the device is in one of its possible operating states, coded electrical Signals are sent to a decoder and control device (not shown in Fig. 2) to generate drive pulses to operate the stepper motors 30 and 32 to generate. The stepper motors 30 and 32 transport the pressure body 18 by translational and rotational movements until the desired type of pressure 20 lies under the stop hammer 26. then the hammer is moved forward and presses the ribbon 28 against the paper 14 behind which the desired character is located. This process described takes place in a very short time, of course. The stepper motors 30 and 32 are then reactivated and lead the pressure body 18 into its original position. Finally, both the anchor device 24 and the Print body 18 shifted one position to the right to the next character that is printed on the paper 14 should be printed, record / u can.

At any point in time / between individual printing operations, the reference status of the device can be changed between the state for "letters *" and "digits", which will now be explained target. Whether or not such a change is made depends on the current state and on the type of the following character. The change can be done manually with the help of one of the Stcucrungseinrichtungcn 16 (Fig. 1) or by receiving an encoded Bcfehlssignal. In this It should be noted that the characters on one side of the pressure body 18 (Fig. 2) Letters are while the characters are on the other Page (not visible) Numbers or special characters are what will be described in detail below.

The instant reference state of the device is indicated by the disk 52 in cooperation with a control circuit and the associated photoelectric devices 60 and 62 maintained. That is, the pholoelectric device 62 determines the operating state for "letters" while the photoelectric device 60 senses the operating state for "digits". These devices work with a Servo device together, which in a time interval immediately before the printing process comes into action and brings the pressure body 18 into the correct position. It follows that immediately Before the printing process, the printing hulls into a correct position in order to avoid mistakes, which otherwise result from a displacement of the pressure hull as a result of vibrations could. In summary, it can be stated that the position of the pressure hull * before the Printing of each individual character is precisely adjusted, whereupon the printing body is shifted and rotated becomes that the desired type 20 is under the hammer 26. Then the establishment 24 excited and the mark printed. The pressure body is then returned to its reference position and transported together with the device 24 by one step to the right.

This process is repeated for printing characters and / or spaces until one Line is full.

ίο After completing a print line, the "Slide reset" initiated. It takes place either by supplying a suitable coded electrical signal, automatically when the line is full or manually by actuating one of the control devices 16. The Schlittcnritckstellung includes a control sequence for returning the Pressure body 18 and the Ansehlaghammcreinrichlung 24 to the extreme left operating position. This structuring program is implemented with the help of a

ao detailed electrical system carried out, which interacts with the photoelectric devices 72 and 94. Derate 72 and 94 represented the Completion of the Rückstcilopcration firmly.

The carriage reset is carried out automatically if no coded command signal or a manually generated command is given. The automatic reset takes place as soon as a word space occurs after the 29th character position has been reached. The automatic reset takes place unconditionally when the 36th character position is reached. This is achieved in that the flag 92 the piezoelectric device 96 with the 2 ⁽ ). Reached the character position and interrupts a beam of light from the beginning of the 29th character position to the 36th character position. The flag 92 therefore cooperates with the photoelectric device 96 and the light source 100, so that a signal 29/36 is generated which indicates these character positions. In a similar manner, the photoclaving device 72 supplies a signal CR (F), which indicates that the reset of the pressure body 18 has been completed (the flag 22 is reset). The photographic execution device 94 provides a similar reference signal CR (H) for the impact device 24.

The device described, the mechanical part of which is shown in Fig. 2, includes several Characteristics that represent an improvement over the previously known devices of this type. These features include: Servo control of the pressure body 18 to avoid errors dui Ί Shake or vibration, automatic edge or carriage reset control, proper ribbon transport and ink supply, etc. Although these Essential features from the description above and

S5 of the drawings is intended to provide a better understanding of this device and its mode of operation the electrical devices are discussed, which are shown in FIGS. 4 and 5 are shown.

The usable coded signals can be

be constructed in the most varied of ways. It will, however in the embodiment described here, binary coded signals in the form of digital pulses, known in the art. The format or structure of these signals is based on the table below. The table also shows the relationship between the individual Characters and related operations of the device.

309633/218

Binary
Input signal codc

Numbers and special characters

0 0 0 0 0

0 0 0 0 1

0 0 0 10

0 0 0 1 1

0 0 1 0 0

Letters Number of turning steps
ties pressure body ^ rs

CR <)
SP

0 0 1 0 I. "fT 0 0 1 1 0 ' 0 0 I. 1 I. 0 1 0 0 0 LF 0 1 0 0 1 ) 0 1 0 I. 0 4th 0 1 0 1 1 8 c 0 1 1 0 0 8th 0 I. 1 0 1 0 0 1 1 1 0 0 1 1 1 I. ^; 1 0 0 0 0 3 j (! () 0 I. 1 0 0 1 0 % I. 0 0 1 1 ·> 1 0 1 0 0 1 0 I. 0 1 ft I. 0 1 I. 0 1 1 0 1 1 1 1 1 0 0 0 - 1 1 0 0 1 2 1 1 0 1 0 I. 1 0 1 1 FIG 1 1 1 0 0 7th 1 1 1 0 1 1 1 1 1 1 0 ( 1 1 1 1 1 LTR

CR

SP

LF

FIG

LTR 0 0 0 0 0 0 0 0

2 2 2

3 3 3 3 3 3 3 3

Direction and number of translation steps

of the pressure hull (preceding »/ -«

= Left,

preceding »R« = right)

LO IA Ll L 3 Kl Rl R 3 K4

LO

Ll

Ll

L 3

Kl

Rl

R 3

K 4

LO

Ll

τ * if, L

L.

Rl

Rl

R3

R4

LO

Ll

Ll

L.

Rl

Rl

RT ₁

R4

From the table above it can be seen that the> first digits (the least significant) of the

dttZttZ STBS

-Bit-C.Kte give. the direction

The printed characters were arranged on eight surfaces of the pressure hull distributed radially around the circumference arranged in the following way:

Letter part
(printed when operating status »letters«)

Tin ϊηζ different structure, ground. alXSa- and appropriately gel-those

K Q U A. W. J F. Y S. E. Z D. C. P. I. L. R. N H *1 T

Numbers and special characters (printed when operating status »ZifTem«)

# 8th * f 5 4th 0 ) % J 6th 7th 3 - • ( 1 - 2

Give the asterisk (*) in the illustration above the two reference positions of the pressure body 18. from which without exception the pressure hull is moved gradually. If, for example, the next / oak is a letter, the sequence position is the Pressure body on the upper star * l under the hammer 24 (Fig. 2). Is the next one

15 characters, however, a digit or a special character specified as a «1, the reference position is at the lower asterisk * / below the stop 24.

The electrical system shown in Figure 4 is used to bring the pressure hull into a position from which either a letter or a number or a special character is printed. These are the two reference positions.

The electrical input signal, which contains a character or a control operation! ', reaches an input register via a line 120 (FIG. 4) 122. The FZingangslcilimg can be a Cable with several conductors (one for each binary bit Line) or a single line on which the one / a character image is delivered in serial form will.

Some signals are explained in the table below. In the following description all these signals will be described in more detail in context.

signal

29/36

CR (F) CR (H)

CR SP LF FIC

LTR

Binary
word

LESKN TR

importance

The pressure hull is in the 29th to 36th character position

The pressure hull is in the 1st character position

The stop hammer device
is in the first character position

Command signal for stopping the slot in the morning
Line feed command signal

Command signal for operating status
»ZifTem«

Command signal for operating status
"Letters"

Coded input word consisting of 5 bits, which represents the various Retrieves characters and triggers the individual operations of the device

Solves the printing process (external)

Translational movement of the pressure hull to the right (signal SE available)

signal importance TL Translational movement of the pressure body
pers to the left (signal .SV- "available] SL Translation step of the pressure hull RFD Rotation step of the pressure hull
downward RFU Rotation step of the pressure hull
up FS Print body is set for printing FR Pressure hull is in the reference position
returned CO Start of the print cycle with offset
of the pressure body interval CO Resetting of the pressure hull to the «·
Reference interval SC Pressure hull servo interval (FIC) Pressure hull is not in the dei
"Numbers" position (LTR) Pressure hull is not in the
"Letter" position

The input register 122 is connected to a decoder control circuit 124 which provides desired output pulses for control operations. yeast as explained in the table above. In detail, the matrix circuit supplies the output signals SP (space), CA (carriage return), LF (line feed), LTR (operating status for "letters") and FlG (operating status for "digits"). The matrix circuit includes a logic diode circuit known in the art. The matrix circuit also supplies the encoded drawing command signals via a multiple gate 126 to the stepper motor control circuit 128. The decoding circuit sends encoded drawing command signals via the gate 126 to the stepper motor control circuit 128 when an activation signal "READ" appears at the terminal 132. The "READ" signal is part of the input signal transmitted to the device and occurs when an encoded character word is in the input register 122.

The gate 126 can consist of several AND gates as mentioned above. When activated, the coded words are transferred to a register located in circuit 1?>. The circuit 12Ϊ is explained in more detail below. Your task is to provide various control pulses to signals corresponding to the movement of the Druckkör pers. If the code word hebeispielswei * contains a command for an axial movement to the right, an output signal TR appears. while an output signal TL is given in the case of a command for a translation movement nail left. Changes output signals are the signal SF (translation step of the pressure body); the signal RFD (pressure hull rotation step down); RFV (pressure hull rotation step up); FS (set

zen of the pressure hull) and the signal FR (backstop of the pressure hull). The stepping motor control circuit 128 causes the movement of the pressure body 18 by sending corresponding control pulses / u

3387

14th

ichritimoioren supplies. Then Jas Simia appears! S and triggers the actual printing process. The pressure hull is then maintained with the help of such work cycles. the pressure hull in the reference position and see: · this position immediately before the start

iblf k d

: ans; ssiunalen of the stepper motor control circuit 128 printing process. The workflow can be in Uer i. mf \ a Bez.jcsposition returned, which can be logically represented by 5 send ways:

uespo
in Siunal FR at «ezeiui will. In the time interval between

Opera ''" ¹¹

READ · Pressure hull 0 - CO CO ■ Fs · Delay CO

CO FR = ■ .VC set pressure hull
Reset pressure hull
Pressure hull servo operation

35

The time interval in which the pressure hull is under servo control is extended, at intervals for device control operations. about slide retraction etc .. to be able to insert.

The various control operations will now be considered in more detail. An output signal LF on one of the lines 130 of the decoding circuit 124 causes a line feed for the paper to be printed and is therefore applied to the line feed magnet 136, which feeds the paper by one line. The line feed magnet is also automatically energized upon the occurrence of a carriage return operation. When the carriage is reset, a signal CR appears on a line 138 which is connected to the line feed magnet 136 via an OOER gate 140.

The slide reset can be triggered by three different command sources. If a switch 142 is closed, a positive signal goes to an OR gate 144 and generates a signal CR on line 146. which triggers the carriage reset. This signal CR can also be generated automatically if the signal .SP (space) appears at the same time as the signal 29/36 (the pressure body has at least reached the 29th position). If these two signals occur at the same time. as a gate 148 is activated and the positive signal CR supplies via gate 144 to line 146. Finally, the carriage return position can be triggered at the output of Malrixsehaltung 124 also by the appearance of the signal CR.

If the signal CR is on line 146, a flip-flop 150 is set and an oscillator 152 is caused to operate at a higher frequency. In general, the oscillator 152 can be constructed like any variable frequency oscillator, which normally operates at a lower frequency, but when the signal CR appears from the flip-flop 150, it changes to a higher, stable operating frequency in order to drive the carriage clcmunlc (pressure hull and Aiisclilaghammcr ) to be able to return to the reset position more quickly. The oscillator may contain, for example, a capacitor which is charged by the signal CR and thereby increases the frequency in a manner known in the art.

The signal CK also reaches an AND gate 147. At the same time, the AND gate 147 receives output pulses from the oscillator 152 via a conventional pulse shaper 149. During the slide collapse, the shrill color scales 151 and 153 receive pulses with a higher repetition rate via their reset inputs. The tendon motors 30 and 80 therefore guide the pressure body. 18 and the stop hammer cretnrichlimg 24 on the left side of the printer. The complete resetting of these elements is achieved with the help of d. photoelectric devices 70 and 94 (above in connection with Fig. 2_erlaii Ter;) and displayed by the circuits 155 uü, 157 of Fig. 4 the signals CR (F) and CR (I!) n: together with the signal CR deliver. The signals CR (F) and CR (H) activate together with de-sienal CR (from flip-flop 150) an AND gate 15-J, whereby the flip-flop 150 is reset when the signal CR decays. This indicates the complete carriage reset operation.

Another device control operation bctrili the "space" caused by a signal SP . The signal SP sets a character space. This process includes a single step for both the motor 30 and the motor 80 to advance the pressure body 18 and the stop hammer accordingly. To carry out these steps, the signal .SV is fed to the forward switching inputs of the step circuits 151 and 153 via OR gates.

The remaining operating signals LTR and / -7 (7 determine the changing state of the device by setting a flip-flop 160. The state of the flip-flop 160 can also be changed manually by operating a toggle switch 162. In detail, the flip-flop is at Occurrence of the signal LTR set, which is fed via an OR gate 166. The flip-flop 160 can also be set (operating state for "letters") by moving the switch 162 to the left, so that a signal is sent directly from an Ouellc positive voltage is supplied via the gate 166. The flip-flop 160 can be reset in a similar manner (operating state for "digits") by transmitting the signal FIG via an OR gate 164. The switch 162 can also be used to reset the flip -Flops 160 can be used in the manner described above via gate 164. Flip-flop 160 therefore provides either a signal LTR or a signal FIG until its state is changed se the signals LTR and FlG are to be regarded as complementary signals.

In addition to controlling the direction of rotation of the printing body (for printing a letter or a number), the signals LTR and / ¹ Vf?

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used to make the pressure body 18 appear immediately. Thereupon the gate 180 is fully activated.

the beginning of a Dpxkz \ klus in the corresponding Es resets the flip-flop 170 so that the signal

Bring reference position. In dii_> em together .ST disappears and lasts the Linstellopera'ion.

Hang photoelectric devices 60 and which precede a character printing process.

62 (Fig. 2), as explained above, the position of the 5 The signal GO from gate 180 becomes a FHp-

Pressure body 18 fixed. Depending on whether the print flop 184 was sent for the character print cycle,

body is in the reference position for "letters" which are a signal for the temporal division of the inner

or "digits" is located, this is provided by the signals valles of a print cycle. 1st the flip-flop 184

(FlG) and '(LTR) are displayed. If the photo stops, then the stepper motor control circuit 128, line circuit, fixes that the pressure body is not OK, which also receives the signal GO , with which is in the position for "letters", a setting of the pressure body in the corresponding signal - ( LTR) . If the print position is "for a desired character,
body not in the position for "digits", a signal - (FIG) is supplied in the motor 30. which the translational movement is similar to. The control of the pressure hull can either be done via the automatic positioning of the pressure hull is 15 forward movement input A of the circuit 151 or with the help of two AND gates 168 and 169 from the reset input Jer the same circuit. In detail, the gate 168 receives the Si are moved step by step. A forward movement of the LTR signal from the flip-flop 160 together with that of the motor rest a transhnion movement of the signal - (LTR), the drive pulses of the oscillating pressure body to the right, while a gate 152 and a signal SC from a flip-flop 20 move backwards Motor to a left shift 170. The signal SC appears during this auto shift of the pressure body leads. The signal TR matic positioning cycle. The AND gate from circuit 128, which indicates that a 168 remains, therefore, right shifting should take place during this time interval, is activated until the signal - (LTR) disappears, which is used to activate two AND gates 190 and 192, indicates that the pressure body is in the reverse direction, the signal TL, which is in the correct position to the left when the system indicates movement or backward movement, assumes the instinctual state for "letters". Until this activation of the AND gates 194 and 196 used is the case, driving pulses from the AND These gates are connected to the opposite EinGatter 168 via the OR gates 176 and 172 for receipt by the circuit 151st It follows from this that the forward movement input of the circuit 174 is controlled so that when the gates 190 and 192 are activated and the motor 32 for the pressure body rotation, the motor 30 moves the pressure body to the right. The motor rotates the pressure body DES vvährend upon activation of the gate 194, and half FO until the desired reference position of the pressure body 196 is moved leftward. Da-letter is reached. after the pressure hull is in each case in the respective

In a similar way, the AND gate 169 35 is led because the opposite direction,
by the signal from the flip-flop FIG supply Assuming 160 Drurkkörpermotor 30 moves together with the signal - (FLG) from the photoelectron the pressure body to the right, so the gate 190 is trical circuit 167 and the signal SC from the first activated by the signal TR and the signal GO akti-flip-flop 170 . The AND gate 169 fourth, whereby the stepping pulses SF remains activated and allows stepping pulses to flow 40 OR gate 200 to the circuit 151 through until the reference position for digits from the printer and the motor 30 move forward. At the end body is achieved. These stepping pulses of a stepping movement are supplied by the stepping motor control flows from the AND gate 169 through the OR circuit 128 a pulse FS which indicates that the gates 176 and 172 are set to the forward movement input pressure body. This pulse actuates the circuit 174 of the stepping motor 32. 45 hammer magnet 202, then flows through

It should be noted that the actual a delay circuit 204, whereby the print-printing operation can not be started while the body is returned to a reference position. If this setting operation is not completed, ie the flip-flop 184 is set, the signal -GO activates the gates 192 and 196 as long as the pressure body is not in the appropriate position. the reset reference position is located. To the operational sequence 50 signal is sent so that the pulses SF now complete a monostable Mullivibra is provided either by an OR gate 200 or 210 to the gate 173 , which both step switching back of the pressure body to the original pulses from gate 169 as well from the gate 168 borrowed central reference position can flow,
receives. The monostable multivibrator 178 insists the initial movement remains in a state in which there is no shift to the left, the process now reverses the signal to gate 180 during a time interval in such a way that the introductory step-by-step cycle is delivered, which bridges the time interval of the drive pulses pulses through the AND gate 194 during the. The gate 180 therefore remains deactivated, timing intervals of the signal GO flow and which are sent 32 until the stepping pulses no longer reach the motor reset step via the AND gate 196. The gate 180 is gc-60 and the pressure body to the right in its output locked as long as a correction to the positioning position. The above-explained translades pressure hull takes place. Thereafter, the monostation movement of the pressure hull to the right or bile multivibrator 178 is reset (to the left, of course, in accordance with the short delay) and delivers an activation signal to the AND gate 180, which generates a signal GO 65 The method of operation of the system for executing is generated, provided that the system is rotating. The turning operation and provided that a READ signal is set up, however, is indicated by a »letter« -

i 774

«Digits \ -flip-flop 160 determined. This means that when the flip-flop 160 is set and the Sienal LTR supplies, the pressure body, viewed from the front, is rotated downwards, which is in accordance with the forward steps of the motor 32 provided for this purpose. ! The print body must either be rotated forwards, depending on whether the character to be printed is a letter or a number or a special character. If the character is a letter, the output RFD (pressure body: turn down) contains one pulse for each downward turning step. On the other hand, if the character is a digit, the output signal RII 'contains pulses with which the pressure body moves upwards. can be. The RFD pulses flow through an AND gate 220 (activated by the GO signal) and an OR gate 222 to return the circuit 174 of the motor 32. In this case the pressure body is rotated into the letter area. If the pressure body is rotated in the number and special line areas: h, pulses RFU must flow through an AND gate 228 (activated by the signal CO) and the OR gate 172 to the forward movement input of the circuit 174. After the desired rotary movement has been carried out and the printing operation, the GO signal disappears, the —GO signal appears and the pressure body is reset to the reference position by a set of RFU or RFD pulses. The set of pulses for resetting is opposite to the first set of pulses and flows via one of the AND gates 226 or 230, which are activated by aas signal ~ GO in order to reset the pressure head to its starting position.

For a better understanding of the device described above and its mode of operation, together with FIGS. 2 and 4, the operation for printing characters, carriage return, etc. will be explained. For this purpose it is assumed that a binary code word 11111 first arrives as a series of pulses via the input line 120 and is held in the input register 122 . The de-coding matrix circuit 124 responds to such an input signal and provides a signal LTR at its corresponding output 130. This signal flows via the OR gate 166 to the flip-flop 160 and in doing so sets the flip-flop so that the signal LTR is generated which indicates that the next character is a letter.

If the flip-flop 160 is set, the Signa! LTR to gate 168, and when photocell circuit 167 provides the - (LTR) signal, drive pulses flow from oscillator 152 through AND gate 168, OR gate 176 and OR gate 172 to the feed forward input of circuit 174 of motor 32. until the appropriate reference position is reached. in this position the hammer is located above the upper star, which is indicated in the table above. If for whatever reason the pressure hull is shaken or moved in any other way so that it is no longer in the reference position, the signal - (LTR) appears, whereby a restoration of the reference position is initiated.

Assume that the next code word 10011 appears in the form of pulses on line 120 at the input of register 122. The decoding matrix identifies the code word as a character. After a short time interval, the sign appears! Li SEN at Eineang 132 and activate the gate 126 so that the code word 10011 at the Schnttmotor -., Uerschaltunuen can flow 128. The first BE, -the number -10, the code word passed to. that de; Pressure body two grooves in the Buchsiabenbere.c; · should be rotated. The middle digit "0" gives ar, dai; the translation movement to the left must be carried out. The last two digits »II * gen, -an. that three translation steps to the left follow M.iicn The table above shows that ei:. denrtiiie displacement of the pressure hull the Bu .: Maben ^: above, directly below the stop hammer.

126 brinct. . ,,

The desired shift is brought about by: Suirittnunorschaltuns 128, which a Sigr TL supplies there. an-zibt. ddi \ the translational movement :: to be executed to the left. Furthermore, c lietert: circuit 128 "three pulses SF which flow through üa AND gate 190 and OR gate 200, - and the engine th 30 by three steps to the right-shell ¹ It should be noted that the gate 19s.! is activated by the flip-flop 184 during this time interval, which supplies the signal GO.

Simultaneously with the operation described above, the stepping motor control circuit 128 supplies two Ir pulses RFD, which flow through the AND gate 220 and the OR gate 222 to the circuit Π4 and cause two rotational steps of the pressure body. In this way, the pressure body reaches the desired position.

The stepper motor control circuit then delivers s ..-. a setting signal FS for the pressure hull, which d. to the stop hammer device 202 (FIG. 4) ■■ '·, and the stop hammer device 24 (FIG. Z ¹ operates. In this way, the hammer 26 prints ■ the letter "B" on the paper.

The setting impulse for the .. pressure hull flows. ·. by a delay circuit 204 (Fig. 4) ι an activated AND gate 233 to the reset flip-flop 184, which supplies the signal -GO. IX-the AND gates 192 and 196 are activated so that the motor 30 for the translational movement of the pressure body can return to its starting position. This operation is done with the help of de; Impulse SF. suitably supplied with signal TR from stepper motor control circuit 128 and returning the motor to its appropriate central position. The pressure body is also returned to its reference position, namely by means of pulses RFU, which DA gate 230, soft Activate by signal GO! is. flow. It follows that the letter "B" has been printed and the system has been returned to its original position.

If the pressure body is in its reference or rest position because of the setback pulses, the stepping motor control circuit supplies a signal FR which indicates that the pressure body has been reset. The signal FR sets the flip-flop 170. The flip-flop 170 is used to create a time interval zi in which the pressure body is automatically returned to the reference position. A new operating cycle begins with the appearance of the READ signal, which resets flip-flop 170 and sets flip-flop 184 for the character printing cycle.

From the above it follows that dre

different work intervals are provided. In the first interval, the printing body for printing the desired character is set. In the second interval, the pressure hull is returned to its reference position. In the third interval, the pressure body is automatically brought into its new reference position until a new drawing command arrives. The apparatus continues to print characters or spaces until either a carriage reset signal CR is decoded or until, on the other hand, an automatic carriage reset occurs when a space signal SP occurs and the carriage is at least 2 ^l >. Character position is located. In this case the clatter 148 is activated, whereby the flip-flop 150 is set and the signal CR / um oscillator 152 is sent. The oscillator then increases its frequency, which leads to a quick return of the slide elements (pressure body and stop hammer). As explained above, the carriage return is terminated when the signals CR (F) and CR (H) from the photocell circuits 155 and 157 appear. These signals indicate that the pressure body 18 and the stop hammer 24 have been returned all the way to the left. Thereupon the gate 154 is activated and the flip-flop 150 is reset.

The device guides the carriage return - which can be seen - either on command or automatically out. Furthermore, the device works relatively quickly and accurately. The insensitivity to Shocks or vibrations is considerably increased and the maintenance effort is reduced, which is also due to the improved ribbon layout.

The in F i g. Circuits shown in FIG. 4 are known in various embodiments, except for stepper motor control circuit 128 , and are widely used in the art. The construction of the stepper motor control circuit 128 is shown in FIG. 5 in the single .. 'n and should now be considered.

As explained above, the binary code word consisting of five bits is divided into three parts in the stepper motor control circuit 128. The first two bits indicate the rotational steps of the pressure hull, the next bit determines the direction of the translational movement and the remaining two bits indicate the number of translational steps of the pressure hull. In this context, the bit determining the direction has the same function with regard to the translational movement as the "letters" - "numbers" c-signals LTR and FlG with regard to the rotation of the printing body. This means that if the system is in the operating state for »letters and the LTR signal is present, the pressure hull is rotated downwards. The reverse process occurs when the FIG signal appears.

Reference is now made to FIG. Via the two input lines 250, the two binary bits from the gate 126 (FIG. 4), which indicate the number of rotational steps of the pressure body, were called individually. These signals are stored in a two digit register 252 (Fig. 5) which is self-clearing, as is known in the art. The register 252 is connected to a coincidence detector 254 . The coincidence detector is also connected to the output of a step counter 256 known in the art. The connection is made by cables 258 and 260 . Different types of coincidence detectors. those that come into question are also known in the art. The detector 254 supplies an output signal to the line 202 if the contents of de-registers 252 match the contents of the counter 256. If this is not the case, the detector sends a signal over the line 264.

The counter 256 is also connected to a NuIi detector 266 , via a cable anyway

in 268. The zero detector 266 provides an output - ii; pi 'to a line 270. when the counter 256 aut Nu! is reset. If that is not the case, er-chei: ·: no initial signa! on line 270.

After these introductory explanations de- ·; Fig. 5 shown subsystem is now to I land a-. .Duty cycle described the device in more detail the individual work steps eiei η timely with other elements of the.-templated graze. Assume that register 252 h.i:

via lines 250 i \ i at a point in time in we; the counter 256 is cleared. received two digits. When the signal GO appears , drive pulses are supplied through an AND gate 272 for switching the counter 256 up to the counting state registered in register 252. Any pulse thus provided also flows through two AND gates 274 and 276. These gates are activated by the signal on line 264 indicating that there is no coincidence and by the signals LTR and FIG. This means that only one of the gates is activated, depending on the operating status of the system. For example, if the LTR signal is present, each count up of counter 256 is accompanied by a pulse through gate 274, referred to above as an RFD (downward rotary motion) pulse. Therefore, pulses are delivered until the counter 256 reaches the value held in register 252. The signal then disappears on line 264 and deactivates L ¹ ND gates 274 and 276, so that no further control pulses for rotating the pressure body can flow through them.

At the same time that the signal on line 264 disappears, a signal appears on line 262 and activates an AND gate 278, which also receives signal GO and therefore emits a signal FS (pressure body set). The Signa! GO disappears while the GO signal appears:

It should be noted that this change mn coordinated the stepping motor control circuit for the purpose of executing the translation of the pressure hull will.

When the signal GO appears an AND gate 282 is activated so that reset pulses can flow through this gate. These reset / pulses also flow to two AND gates 284 and 286, i'- ren output signals which are signals RIl and RFD . These signals are reversed, however, in order to

6c to bring about the resetting of the pressure hull. The gates 284 and 286 remain activated until the zero detector 266 determines that the counter 256 is clear. The signal on line 288 then disappears and gates 284 and 286 are disabled. If the counter 256 hears the counting state zero, this is indicated by the zero detector in that it sends a signal to the line 270 which, together with the signal GO, the AND gate 290

fourth, so that the signal FR (pressure body rushes back) appears.

/ ie explained above, the in F i g. 5 shown aging used in a similar form to control the slalion movements of the pressure hull

The bit determining the direction is analogous to the signals LTR and FlG. This again shows the many possibilities in the construction of this device. The embodiment described here is therefore only intended as an example.

1 sheet of drawings

Claims (4)

supplies a signal if the type carrier is not in the other starting position. Claims: 5-printing unit according to claim 1, characterized in that in addition to the step-5 motor (32) which rotates the type carrier 1. Adjusted by electrical code signals controlled device, a stepper motor (30) for the axial printing unit with a stepper motor adjustment of the type carrier is provided and adjustable type carrier, in which to print the reset of the type carrier in the axial direction by means of electrical code signals in analog How the resetting of the specified characters eriolgt the type carrier io of the type carrier in the direction of rotation.
durcli the stepper motor from an initial position to the one determined by the code signals Print position moved, then the set Characters printed out and then the Type carrier returned to its original position -5
is characterized in that the
The type carrier (18) is reset under the control of a step counter (256 ). 2o stepper motor adjustable type carrier, in which voi for setting the type carrier in the for printing a by electrical code signals Druckstellun ^ has been acted upon, the fixed character of the type carrier by step counter is assigned a zero detector (266) the stepper motor from an initial position into the, which is after Imprint of the set font - specified by the code signals - the generation of a number depending on the content of the 25, then the set font from the step counter is printed by incremental switching and then the type carrier is set back to the initial pulse for resetting the type carrier . in the starting position, and for on-off the German Auslegeschrift 1 256 930 it is position of the starting position from which the already known, the type carrier of an electrical Movement of the type carrier in the next 30 tric code signals controlled printing unit under Druckstelli, - <g done, circles of coincidence (168, use of electric stepper motors in 169) are provided, which can be adjusted by one of the types - direction of rotation and lengthways, position sensor (167) assigned to the carrier and a specific printing position of the type carrier, are controllable by setting signals and by defining code signals are in a comparison which are stored via the respectively controlled coincidence circuit, and at the same time is sent to the circuit is applied to the stepper motor as long as stepping stepper motor voltage, whereby the pulses are supplied until the type carrier type carrier in the direction of rotation and in the longitudinal direction which is continuously incremented by the applied setting signal. To the type carrier assumed starting position. code comparison disks are coupled, of which 2. Printing unit according to claim 1, characterized in that 40 the actual setting code of the type carrier op indicates that table, inductive or capacitive can be scanned for the optional setting. The Abdes type carrier (18) in two Ausgangsstellun- keyed setting code is a flip-flop is provided (160) in the Vergleichsschalgen whose processing compared with the stored signal code, which a setting signal (LTR) leading output and if they match is the question to the Input of a coincidence circle (168) 45 stepper motor is permanently connected in the current position, which is additionally held with stepping. After both stepping motors have stopped pulses and one has been given the absence of one, the print hammer is caused to hit the output signal ( -LTR) of the position sensor to print the set character indicating the off-starting position of the type carrier. The printing speed is applied (167) , while the other 5 ° is set by the required comparison process limits setting signal {FIG) leading output of the flip, since on average the type carrier for flops with the input of a different coincidence each setting has a complete circle of difference in length (169) is connected, the addition and executes one full turn. Hch with step switching impulses and the out of the German patent specification 911 736 is also Unknown presence of the other starting position 55 already printing telegraph receiver in of the type carrier indicating the output signal after receiving a code signal combination (-FIG) is applied. nation a character wheel of a given angular 3. Printing unit according to claim 2, characterized overall position is displaced from in rotation, with the features that the two coincidence circuits number of character positions through which (168, 169) rotated by a by resetting the 60, the print wheel, are counted. The type carrier generated signal (5C) activatable type wheel is used to imprint the received by the. , captured code signal combination specified font 4. Printing unit according to claim 2, characterized in that it is stopped in a position which determines indicates that the position scanner (167) is determined by the comparison between the number of two photoelectric scanning sensors (60, 62) counted character positions and that of which one supplies a signal if the corresponding code signal combination is caught the type carrier (18) is not in the one number. After the print has been carried out, the type's starting position is located, while the other wheel is rotated in the same direction until it is