DE1449993B2 - CIRCUIT ARRANGEMENT FOR CONTROLLING THE PART OF A MEMORY CONTROLLED SERIES PRINTING DEVICE MOVING IN LINE DIRECTION - Google Patents

Description

For typewriters and typewriters for data processing machines, such as booking machines, Calculating machines that work according to the series principle are used to write down characters, such as letters, numbers, etc. either the paper trolley at the printing unit or the printing unit at the Move paper carts by. This moving part of the writing device is advanced as is known, step by step at intervals that correspond to the predetermined character width, the so-called Division, correspond. For this purpose, a stepping mechanism is provided which, according to the character print or is released after pressing a space bar, so that a drive device is the moving Part advances until the indexing mechanism becomes effective again after the switching step has been carried out is. An imprint will not be made in every switching position, one or more will be Blanks have to be traversed. In general, the space is used to denote the movement of the understood moving part of the writing device, in which a feed without stop of the Type of printing is done. This problem occurs especially with typewriters and booking machines Storage facilities if on them, for example, tables, correspondence text with not full Completed lines of text written and forms such as calculation forms, account cards, etc., filled out should be.

There are accounting machines known in which the moving part of the writing device moved continuously over the entire writing line or starting with the beginning of a column. The imprint the individual characters are then carried out at the individual writing positions during this continuous Move. This can increase the overall writing speed slightly, however only to the detriment of the legibility of the printed characters. Such an application requires about it in addition, precise delivery of the write commands by the moving part of the writing device. There but the switching elements for issuing these write commands always show signs of wear are subject to, proper functioning of such facilities is not guaranteed in the long run. Furthermore, arrangements are known in which the characters to be printed are stored. To When a write command is issued, the content contained in the memory is automatically written down. Included one takes place in every possible writing position of the moving part of the writing device Query of the storage space of this writing position is equivalent to. If a character is stored in it, it will be printed out; is not a When characters are stored, the moving part is switched to the next writing position.

The invention relates to a writing device with stepping mechanisms. With these well-known Writing devices are the places where several characters in a row cannot be printed come, step through, d. that is, the moving part is stopped at every writing position and released regardless of whether an imprint is made in this writing position or not. the kinetic energy of the part to be moved of the writing device must therefore also be used in the event of a sequence are annihilated and rebuilt each time by two or more empty steps. Apart from The increased wear of the parts that are constantly under mechanical stress results in a loss of time, which is the greater, the greater the number of spaces.

It is also known to provide tabs with a fixed form division. However, these leave no freedom to alternate between blank spaces and imprint, because even after antabulating of a column are in particular when invoicing up to

ίο several more blank spaces for the first impression to go through. With known booking engines, each individual column is controlled, if no information is printed in one or more consecutive columns.

Typewriters and accounting machines continue to be a combination of continuous and subsequent step-by-step progression of the moving part of the writing device under the designation Tabulation known per se. It is also known through special program forms in advance to achieve certain subdivisions of the forms to be labeled by additionally using tabulation in the direction of a writing line also a tabulation in the direction of the line break as a result is made that at predetermined positions of the moving part of the writing device special switching commands are transferred from the program form to the writing device. at of this known arrangement is that used for the incremental advancement of the moving part Stepping mechanism can be switched off so that continuous movement up to a certain The writing position specified by the program can be carried out. The prerequisite is, that the positions of the writing device in which no prints are to be made, and the Positions in which the moving part is to be stopped must be known in advance. The invention is based on the stated disadvantages of the known arrangements to avoid with stepping mechanisms by using the during the advance of the moving part Writing device it is determined whether the next character fetched from the memory is one to be printed or a character that cannot be printed (space). According to the invention, this is not to be printed Character assigned a predetermined, but freely selectable switching state of the buffer and bistable switching elements are provided which, when the moving part is advanced by one writing position to the other, on the one hand, lock the printing unit and, on the other hand, that part the stepping mechanism, which stops the moving part of the writing mechanism in the writing position, make ineffective when the switching state of the buffer in the new position its dem corresponds to the switching status assigned to characters not to be printed.

According to a further embodiment of the invention, the stepping mechanism consists of an electromagnetic one Escapement with clutch and brake. The buffer is made in a manner known per se bistable switching elements, whose unset switching positions correspond to those not to be printed Characters are assigned to the corresponding switching status. The switch-on time of the bistable switching elements to control the escapement is due to the inertia of the moving part of the pressure

3 4

Direction determined, so that although a short-term sync pulse causes the transmission of an excitation of the brake magnet results, but the memory SP contained in the Zwinicht on the advance of the moving part can schenspeicher Fl to F 4 at the time of possible. possibility of each print. With the extinguishing pulse

The invention has the advantage that, for example, the switching element F 5 is deleted via line E 2,

when writing tables or when filling them out so that its output u becomes conductive. Simultaneously

of forms with column division none in particular is caused by the sync pulse via line E 1, and-

whose tab devices are required and gate U 9 and AND gate U 8, as the bistable elements

stopping the moving part at the column FS, F9 and FlO are deleted, the setting of the bi-

beginning with a subsequent switching element F 7, which is stable at the beginning of the column, and this in turn the

beginning and continuing until the first print point the switching element F 6. Via the output g

the gradual feed is not required, d. h., more of this element are on the one hand the inductively generated

rere successive spaces are in each coupled bistable element Fl to F 4 of the intermediate

Fall automatically without stopping by the schenspeicher to be moved into its starting position.

Drive through part of the writing device, no matter 15 These positions are in the present example

at which writing positions they occur. The predetermined positions for performing

The essence of the invention is therefore not in fact empty steps. In contrast, the inputs s' are the

thing to see that vacancies are generally galvanically coupled without switching elements F1 to F 4, so

Halt will be passed through, but in that while that now over the AND gates i / l to t / 4 of the

the advance of the moving part of the 20 value of the first queried in a known manner

Writing device before each activation of a character position in the memory SP in the intermediate

Writing position it is determined whether the next can be transferred from the memory F1 to F4.

Memory retrieved characters will be printed or after each memory location has been queried

is a character that cannot be printed. a timing pulse is sent via line E 3

The invention will be given with reference to one in the drawing, which deletes the bistable switching element F 6 and The exemplary embodiment shown in the illustration enables the transmission of a character from the Speiläutert. As an example, the switching of a verbatim SP in the buffer memory F1 to F 4 was instructed printing booking engine selected. Without ties.

Deviating from the principle of the circuit shown, became the first memory location of the memory

If the value zero can be taken from the 30 SP by a slight change in the circuit, then the

Invention without further ado to other than in the initial position of the intermediate store F1 to F 4

chose example underlying working conditions- nothing changed.

be adapted. For example, this will be the case with typewriters, if not tend, so that the bistable fully filled lines is deleted via the OR gate O 2 after the last element F7 has been printed. The arrangement according to the invention is loaded via its output μ letter and the AND gate t / 7 is used to set the bistable switching step in the first empty step to the effect korn- element F 8 and thus the driver stage TK should men. In this case, is effective through a special. This in turn switches the clutch command to the predetermined switching state of the intermediate magnet K. The moving part of the write memory device is now advanced regardless of the previous switching state 40. After this make the cache effective. the creation of parts, i.e. the position in which a

The electronic printing drawn in the drawing can be done, if it leaves, it is only in this one

Components are open in their mode of operation and in the closed position ία 2. Around in

known to their structure. In detail, the mean the middle of the division step, on the other hand, is short-

with s ' and /' designated inputs of the bistable 45, the contact sal is closed early. This switching

Switching elements Fl to FlO galvanically coupled state causes that during the indexing movement

and the inputs marked with s and I inductive generation of an input reaching the line El

coupled, d. In other words, in the first case, the pulse in question becomes ineffective by blocking the AND gate t / 9

The switch position of the element is held as long as it remains,

long a potential on the assigned input 50 After the paper carriage or the printing unit

There is a line, in the other case the EIe switches - if a partial step has been carried out, the contact is sa 1

ment only if a potential change on the input is reopened and contact sa2 is closed,

trunk line occurs. This deletes the switching element F9. There is

In the present example it is assumed that on the one hand the AND gate t / 9 is free, and on the other hand

gone that by some program control 55 the switching element F 8 is deleted. Of the

tion a tender order is given. This can clutch magnet K becomes ineffective and the brake

for example in the case of booking machines, magnet B is effective via its driver stage TB. Of the

if the moving part of the writing device became the moving portion of the writing device D.

the position at the beginning of a booking line or be stopped if not the renewed query

also reached at the beginning of a column. 60 of the next storage location of the memory SP and the

If a word is to be printed out from these places, a logical decision about a change in the switching, the number of places of which is smaller than the possible state of the buffer Fl to F 4, the faster number of places in the column or the posting line, would take place when the braking effect is initially apparent from the moving part that steps. As it is to perform on line on El-writer spaces. For this purpose, the synchronizing pulse occurring 65 by setting the bistable, a clearing pulse is provided via the line £ 2, switching elements F 6 and F 7 of the memory SP are generated, which is queried again at the same time as that via the line E1. Will take effect in the previously described incoming sync pulse. In this way again no change in the switching state of the

Intermediate storage Fl to F 4 determined, the clutch magnet K becomes effective by setting the bistable switching element F 8 and the brake magnet B becomes ineffective.

The alternating effect of clutch magnet K and brake magnet B can be prevented by inserting the AND gate i / 10 and the OR gate O 3 in the lines between the bistable element F 8 and the driver stages TB and TK, respectively the second input can be connected to the output g of the bistable element F 5 via the line b and to the output μ of the same bistable switching element via the line α. This means that the brake magnet B is only effective when the bistable element F 5 is set. However, this switching element is only set if the switching state of the buffer F1 to F 4 is changed after a write-out command, that is to say if the character positions are to be printed.

Now, after setting the bistable switching element F 6, the transfer of the character position of the memory SP queried at this point in time into the buffer F1 to F 4 results in a change in the switching state of one of the four bistable switching elements of this buffer, e.g. B. if the number 5 is to be printed, the bistable switching elements Fl and F 3 are set according to the binary decimal code via the AND gates Ul and U 3. On the one hand, the bistable switching element F 5 is set via the OR gate O1 via its output g ; on the other hand, the conversion into the decimal digit 5 is carried out in the decoder DK. This decoder DK is enabled via the AND gate U 6 because, on the one hand , the bistable switching element F 7 is set by the synchronizing pulse arriving via the line El and, on the other hand, the switching element F 5 is also set. The printout of the character position taken from the memory SP can be carried out by the writing device D.

By setting the bistable switching element F 5, the connection of the clutch magnet K is prevented at the same time, since on the one hand no potential reaches the driver stage TK via the line α and on the other hand the bistable switching element F 8 is not set via the AND gate U 5. After the printout has taken place, the contact srl is switched over. This contact is controlled in a known manner by the switching ring of the writing device. It switches to its working position when a pressure element of the writing device D is in the printing position. The rest of the time it is in rest position. By switching this contact ir 1, the bistable switching element FlO is set. The bistable switching element F 7 is deleted via the OR gate O 2. This has the same effect on the bistable switching element F 8 and thus on the clutch magnet K as was previously described for connecting the clutch magnet K.

Since the bistable switching element F 5 is set, the input of the AND gate U 10 connected to this switching element via the line b also carries potential. After a partial step has been carried out, the bistable switching element F9 is deleted again in the manner described above by closing the contact sa2, so that the bistable switching element F 8 is deleted. The driver stage TB of the brake magnet B is thus effective via the AND gate U 10. The moving part of the writing device stops in this position.

In the meantime , the bistable switching element F10 has been deleted by the contact sr 1, which is again in the rest position. The inputs of the AND gates t / 7 and t / 8 connected to the output u of this bistable element are again conductive. If the sync pulse arrives again via the line El , the bistable switching element F 7 is set via the AND gates U 9 and U 8. A character position in the memory SP is again transferred to the intermediate memory F1 to F 4 via the switching element F 6. At the same time, all four bistable switching elements F1 to F 4 were previously reset via the inductively coupled inputs /.

If the interrogation of the memory SP again results in a change in the switching position of the intermediate memory, the previously described mode of operation of the circuit is repeated.

If, on the other hand, the switching state is not changed during this query, that is, the same feature occurs that was previously used to carry out empty steps, then the bistable switching element F7 cannot be deleted via the AND gate U 5, since the switching element F 5 is still set. Both inputs of the AND gate i / 6 are conductive, so that the unchanged switching state of the buffer F1 to F 4 is decrypted in the decoding device DK and the character assigned to the initial state of the buffer is printed in the writing device D. If digits are used as characters, the number zero is expediently assigned to the initial state of the buffer memory. But it can also be any other number. The same applies when letters are used. By switching over the contact srl , the clutch magnet K is excited in the manner described above and the moving part of the writing device D is advanced by a partial step. At the end of the sub-step, the bistable switching element F8 is deleted and the braking magnet B becomes effective by closing the contact sa 2 again.

If vacancies are then to be passed through on an imprint, the bistable switching element F5 must be deleted for this purpose via the line El. Only then can an empty step be carried out if the switching state of the intermediate store F1 to F 4 remains the same. The switching state of the bistable element F 5 is therefore decisive for whether a blank is passed through or a predetermined character is printed when the switching state of the intermediate memory is the same. The switching state of the element F 8, on the other hand, determines whether the clutch magnet K or the brake magnet B is effective.

Is set to a synchronism of the circuit arrangement illustrated with the remaining operations of the machine in which this circuit is used to dispense, it can time potential are applied to the line for the duration of El transcript. The writing device will then automatically carry out the printout and the incrementation as a function of one another. Such cases are conceivable when the control of the writing device is primary in relation to the overall machine, for example when a stored text is written on correspondence typewriters. at

Booking machines, on the other hand, in which the individual internal machine aisles are opposite the control the writing device are the essential, need not do without a synchronism will.

Claims (7)

Patent claims: 1.Circuit arrangement for controlling the part of a memory-controlled serial printing device that can be advanced by means of an indexing mechanism and moves in the line direction, which determines the occurrence of successive areas to be printed or not, the indexing mechanism being able to be switched off to achieve a continuous feed movement over areas not to be printed and at which the values to be printed in the individual writing positions are taken from a memory and fed to an intermediate memory as a function of a write command, characterized in that the characters not to be printed are assigned a predetermined but freely selectable switching state of the intermediate memory (F1 to F 4) and that bistable Switching elements (F5, F8) are provided which, when the moving part is advanced from one writing position to the other, on the one hand block the printing unit (D) and on the other hand that part (B) of the step switch erkes (B, K), which stops the moving part of the writing unit in the writing position, ineffective if the switching state of the buffer in the new position corresponds to its switching state assigned to the characters not to be printed. 2. Circuit arrangement according to claim 1, characterized in that an electromagnetic escapement is provided as the stepping mechanism, which consists of a clutch (K) and a brake (B) . 3. Circuit arrangement according to claims 1 and 2, characterized in that a bistable circuit (F 8) is provided to control the escapement, the inputs (s, J) on the one hand with switching elements (sal, sal), which by the local switching of the moving part of the writing device are switchable, and on the other hand are connected to the output of the buffer (Fl to F 4), and whose outputs (g, u) are connected to the clutch (K) and to the brake (B) of the electromagnetic escapement , whereby the switch-on time of the bistable circuit (F 8) caused by the buffer is shorter than the time for the brake (B) to become effective. 4. Circuit arrangement according to claims 1 to 3, characterized in that the intermediate memory consists of bistable switching elements (Fl to F 4) whose unset switching positions (outputs u) are assigned to the switching state corresponding to the characters not to be printed. 5. Circuit arrangement according to claims 1 to 4, characterized in that the switching element for controlling the printing unit consists of a bistable circuit (F 5), one input (s') of which with the outputs which become effective when a character to be printed is received (g) of the buffer (Fl to F 4), with the printing unit (D) and its other output (u) together with the outputs (u) of the buffer with the input (s) of the bistable circuit (F 8) that are effective in the unset state ) are connected to control the escapement. 6. Circuit arrangement according to claims 1 to 5, characterized in that the switch-on time of the bistable circuit (F 8) for controlling the escapement is determined by the inertia of the moving part of the printing device during the advance (interrelationship between the contacts sal, sa 2 ). 7. Circuit arrangement according to claims 1 to 6, characterized in that the output (g ) connected to the printing unit (D) of the bistable circuit (F 5) for controlling the printing unit also acts on an AND circuit (UlO) , the second of which Input with the bistable circuit (F 8) for controlling the escapement and the output of which is connected to the brake (B) of the escapement. 1 sheet of drawings 109 549/241