JPS5919186A - Printing apparatus - Google Patents

Abstract

PURPOSE:To reduce the consumption of a ribbon and to fasten operation, by a method wherein a memory means of a printing character is provided and memory content is referred when the character is erased while the sending of an erasing ribbon is not performed with respect to one constituted of plural characters. CONSTITUTION:In order to erase a character M with an underline, the erasing key 102 on a keyboard is pressed down to permit a control apparatus 103 to recognize that erasing operation is subsequently performed and a carriage is moved on previously printed character sets 120, 121 by a known back space key. The apparatus 103 calculates back to the movement amount of the carriage and buffer memory for a printing character line is referred to recognize the character while the same character and the erasing ribbon are positioned between a printing hammer and printing paper and the printing hammer is driven to erase the character by peeling an ink according to the property of the erasing ribbon or by coating a coating material.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing device, and more particularly to a printing device used in a typewriter or the like having a function of erasing printed characters.

In recent years, typewriters have become more multifunctional due to electronicization, and an increasing number of typewriters have a function to erase characters that have already been printed. Generally, vertically printed characters in such a typewriter are erased by (a) returning a carriage mounted with a printing means on unnecessary already printed characters; (b) Place an erasing ribbon (such as one whose back side is coated with an adhesive substance or a substance of the same color as the paper) at the printing position instead of the ink ribbon for printing. (C) This is performed by three operations: printing the same type of characters as the vertically printed characters via an erasing ribbon. Advanced electronic typewriters that have a function to memorize input or printed characters can perform the task (a) above and automatically perform the task (bL (C)) simply by pressing a specific erase key. There are also some that are complete.

On the other hand, not only the erasing function but also the text highlighting function has become more convenient due to digitization. For example, manual
When underlining with a typewriter, etc., after printing the text, the carriage was returned to the desired point and the underline was changed by -1. There are some cases in which the underline is automatically removed along with the text by changing the text.

By the way, if you think about printing and correcting underlined characters, in conventional typewriters, after printing or erasing the characters, the ink ribbon or correction ribbon is advanced one character and the -underline is printed. , or had been erased. When printing or erasing underlines and characters, the printing ink ribbon or erasing ribbon does not use the same location, but characters always print (erase) → underline print (erase)
Since the ink ribbon (erasing ribbon) must be fed during this process, it is not economical, but it also takes a long time to operate.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a printing device which requires less consumption of printing ribbon and erasing ribbon, and which is suitable for use in fast-operating typewriters and the like.

In order to achieve the above object, the present invention provides a storage means for storing #j printed or input characters, and by referring to this storage means, when erasing a vertically printed character composed of a plurality of characters, adopted a configuration in which erasing of this set of characters is performed without sending an erasing ribbon.

The present invention will be described in detail based on the embodiments shown in the drawings. FIG. 1 shows the external appearance of a set of electronic J'' typewriter to which the printing device of the present invention is applied.Here, characters arranged on the keyboard IJ- are shown. By pressing the key, the carriage 3
Platen 2 is struck by hammer 4a of printing hammer unit 4 through the printing ribbon from the back side of printing type 5a provided on printing wheel 5 set on soil.
It is configured so that printing is performed on a printing paper 6 made of clay. Furthermore, an erase key, which will be described later, is arranged on the keyboard 1.

FIG. 2 shows an embodiment of the carriage portion of the printing device of the present invention. Here, the carriage 3 is passed through a guide section provided at the bottom of the lower stand 11 by a guide rail 1o arranged parallel to the platen 2, and is moved left and right along the guide rail 10 by a gear ridge drive device (not shown). 1jJ-Noh.

A type wheel 5 and a print hammer unit 4 are disposed at the front of the lower base 11 of the carriage 3, in a portion facing the platen 2.
A type rJ engraving mechanism is provided, and a printing ribbon cassette 7 containing a printing ribbon 7a is mounted behind it.

The printing ribbon 7a stored in the printing ribbon cassette 1 is pulled out from the arm of the cassette 7 that protrudes forward! And it's being hung up. In FIG. 2, the exposed portion of the printing ribbon 7a is exposed to the printing ribbon cassette 7 during the printing operation.
is rotated in the direction of arrow A in FIG. 2 by a printing ribbon shift plunger (not shown) about rotation shafts 7b provided at both rear ends thereof, and the type 5a of the type wheel 5 is rotated. It is configured to be interposed between the printing paper 6 on the platen 2 and the printing paper 6 on the platen 2.

FIG. 3 (6) shows a side view of the double carriage 3 in the non-printing state, in which the printing ribbon shift plunger (not shown) is in the non-driving state, and the printing ribbon 1 and the erasing ribbon are in the non-printing state. 8 are both at the bottom of their swing strokes, so the type 5a faces the printing paper 6 on the platen 2.

FIG. 3 [F]) shows the same side view of the double carriage 3 in the printing operation state. Prior to the striking of the printing hammer 4a, the aforementioned plunger (not shown) is energized, and its drive causes the printing Ribbon cassette 1 is its shaft 1b
The iL1 print revolving unit 7a, which is swung upward around the center, is interposed between the type 5a and the printing paper 6 on the platen 2, and printing is performed.

FIG. 3C) shows the same surface of the carriage 3 mentioned above in the erasing operation state of vertically printed characters, and the plunger for shifting the erasing ribbon shown in the figure is pressed immediately before striking the printing hammer 5a. When the arm 9 is energized and driven, the arm 9 is swung in the - direction about its axis 12, and the erasing ribbon 8 is interposed between the type and the printing paper 6 on the platen 2, and the erasing ribbon 8 is inserted vertically through this. The vertically printed characters are erased by striking the same type as the printed characters. However, at this time, the printing ribbon cassette 1 is pushed up from the direction 1 due to the swinging of the arrow 9 and is further retracted toward the direction -C1.

The lift state of each ribbon shown in Fig. 3 CB> and Fig. 3 (C) is changed as shown in Fig. 3 (3) due to its own weight when each plunger for printing ribbon and erasing ribbon is de-energized. It is configured to return to the state of

Figure Wj4 shows a control circuit for the ribbon shift mechanism of the carriage 3 described above, and those indicated by numerals 101 and 102 in the figure are connected to the control device 103 by character keys and erase keys arranged on the keyboard 1, respectively. has been done.

The control device 103 includes a CPU, a buffer memory for print character strings, and other control systems such as a type wheel 5, a print number unit 4, and a carriage portion 3.
Since these are well known, they are omitted here, and only the control systems for the printing ribbon shifting plunger 110 and erasing ribbon shifting plunger 111 described above are shown. Here, the plungers 110 and 111 are driven by a drive device 104 10 that receives an output signal from a control device 103 and is driven by electric power from a power source 106 connected to it.
5 to the control device 103, respectively.

In the above configuration, in order to perform a normal printing operation, press the desired character key 101 (here, r
Press MJ). As a result, the control circuit 103 rotates the type wheel 5 by a known operation to interpose the desired type 5a (M) between the print mark 4a and the printing paper 6. Immediately thereafter, the control circuit 103 starts driving the drive device 1.
04 to drive the plunger 110 for the print ribbon 7 foot, and press the printer A7 cartridge 3. The printing ribbon cassette 7 is swung around its shaft 7b in the direction of the arrow A in FIG. The printing hammer 4a is driven in synchronization with the positioning of the letter JMJ, and the letters 5a are struck onto the printing paper via the printing ribbon 7a, thereby printing the letters JMJ. Next, the control circuit 103 stops driving the plunger 110 via the drive device 104, and as a result, as described above, the printing ribbon cassette 1 returns to the position shown in FIG. Ribbon 7a and gear ridge 3 are moved one space.゛Synchronizing with the above series of operations, the control device 103 prints the character (M) printed in the built-in print character string buffer memory.
Store the corresponding code. This buffer memory is composed of, for example, a shift register, and stores printed characters in sequence, and is a well-known type that can store characters for one line or several lines.

r printed in the same way as above with the underline type
If printed under the character MJ, the characters as shown in Figure 5 (
M)120. The printing of the underlined characters consisting of the underline 121 is completed. This underline-dominant printing can be done even if the keyboard is equipped with a key for specifying underline printing, and by setting this key, character printing and underline printing are automatically performed consecutively. good. Furthermore, even if several lines of character examples are stored in the buffer memory and these are printed in several lines, the operations described in item 2 are the same.

Next, the operation of erasing the amplifier line (-1 character (Y)) shown in FIG. 6 obtained in the above manner using the above configuration will be described in detail below.

First, keyboard 1. ] By pressing the second erase key 102, the control device 103 is made to recognize that the erase operation will be performed from now on, and then by pressing the well-known bank space key etc. 120,121 (¥)” Move to second. With this operation, the control device 103 calculates the distance of the carriage 3, recognizes how many spaces have been backspaced, and uses the above-mentioned print character string to find out what the character was printed at that location. Reference buffer memory. In this case, as mentioned earlier, the underlined code is stored together with the code for the character 120 (M), so the control device 10
3 is the same type 5a as the printed character 120 (M).
) After positioning it between the printing hammer 4a and the printing paper 6 in the same manner as described above, perform the following operations.

First, the control device 103 drives the erasing ribbon plunger 111 via the drive device 105 to swing the ground 9, also known as the print ribbon cassette 7, in the direction of arrow A in FIG. As a result, the erasing ribbon 8 is positioned between the printing paper 6 and the type 5a as shown in FIG. 13(C).

Subsequently, the printing hammer 4a is driven in the same manner as when printing, and depending on the properties of the erasing ribbon 8, the ink is removed or a coating material is applied (I) to form the characters 120 (
M) is deleted.

Subsequently, in a normal erasing operation, the carriage 3 and the erasing ribbon 8 are moved by one space, but the erasing device 10
3 recognizes that the character 120 (M) is in the A/R line 121 (=J) as described above, so neither the gear ridge part 3 nor the erasing ribbon 8 are sent, and the type wheel Rotate 5 to type 5 for underlining.
Printing a is interposed between the marker 4a and the printing paper 6,
The underlay /121 can be erased by the same operation as described above.

In the above configuration, the erase key can be either an alternator type that allows the erase operation to continue until the next press once it is pressed, or a momentary type that is released each time a character is erased. It is also possible to print both characters and underlay/ without feeding the ribbon when printing.

As is clear from the above description, according to the present invention, a storage means for storing printed or manually written characters is provided, and by referring to this storage means during erasing operation, vertically printed characters composed of a plurality of characters can be erased. In some cases, the erasing operation is performed without sending the erasing ribbon for this set of marked 'j' characters.Since the 17 composition is adopted, it is easy and inexpensive to use, with less ribbon consumption and smooth operation. A fast printing device can be provided.

[Brief explanation of drawings]

Fig. 1 is an external perspective view of the 1-old J device of the present invention, Fig. 2 is an external oblique view of the carriage section of the printing device of the present invention, and Fig. 3 1'A) to (C) are - 9 is an explanatory diagram showing the operation of the joint part, FIG. 4 is a block diagram of the control circuit of the printing device of the present invention, and FIG. 5 is an explanatory diagram showing the printing results by the printing device of the present invention.・Keyboard 3 ・Gear ridge part 6 ・
・Print paper 1 ・Print ribbon cassette 8 ・
...Erase ribbon 101...Character key 102...
Erase key 103...Control device 110.111.
...Plunger Figure 2-483-

Claims (1)

[Claims] In a printing device that performs printing and erasing vertically printed characters according to commands input from a keyboard, means is provided for storing printed or input characters,
1. A printing device characterized in that when erasing a vertically printed character composed of a plurality of characters, the erasing operation is performed without carrying out erasing ribbon feeding by referring to the storage means.