JPS6330876B2 - - Google Patents

Abstract

PURPOSE:To obtain a clear printing blurring of character or the like when printing is performed with the depression of a dead key by moving a carriage initially to a necessary amount and then, to the specified position before feeding a ribbon. CONSTITUTION:When a dead key for ''Umlaut'' or the like is operated, after the printing, a carriage 13 is moved once by one character width in the direction of feeding characters. A ribbon 19 is fed by one character width so that the new part thereof reaches the printing position. Upon the end of the stepping movement of the carriage 13, an electromagnet 18 is demagnetized and a cassette holder 15 returns to move the carriage 13 by one character width in the opposite direction this time. In this case, the feeding of the ribbon is not performed because of the rise of a clutch shaft. After the returning of the carriage 13 to the ''Umlaut'' printing position, with the operation of the corresponding character key, a selected character is printed. Thereafter, the carriage is moved by one character in the direction of feeding characters.

Description

[Detailed Description of the Invention] Technical Field The present invention provides a printing operation in which a carriage carrying a ribbon cassette and a printing element is moved along a printing line on a platen, and the carriage is moved in conjunction with the printing operation. The present invention relates to a printing method using a typewriter in which a ribbon feeding operation of a ribbon cassette is performed based on the present invention.

Prior Art This type of typewriter has the advantage that, as mentioned above, the ribbon is fed based on the movement of the carriage, and that movement is used as a driving source, so a dedicated ribbon feeding motor is not required and the structure is simplified. have.

However, in a typewriter configured in this way, when printing umlaut characters, bold characters (thick characters), and underline characters shown in Figure 1 a to c, these characters are not printed correctly. , there was a risk that some or most of the printed characters might become blurred or faded.

In other words, an umlaut character is one in which one of the letters A, O, or U is printed below the umlaut, and a bold character is a character in which one alphabet is printed and then the same alphabet is slightly shifted. The underline characters are printed so that they overlap each other, and furthermore, the underline characters are printed below after the alpha alphabet is printed. In this way, in the case of printing umlaut characters and underline characters, the alphabet or underline is printed without character advance after printing the umlaut or alphabet, and in the case of printing bold characters, the second printing There is a slight text shift before the text. That is, when printing umlaut characters and underline characters, the carriage does not move at all, and when printing bold characters, the carriage does move, but the amount of movement is very small. Therefore, when printing umlaut characters and underline characters, the ribbon is not fed at all, and when printing bold characters, it is fed only by a very small amount.

On the other hand, the ribbon is normally placed at a rest position below the printing surface of the platen, and when printing is performed, it is raised to a printing position facing the printing surface. Therefore, when printing umlaut characters and underline characters, if the ribbon always rises by a certain amount accurately from the rest position to the printing position for each printing operation, punched characters identical to the printed characters will be formed on the ribbon and printed. is done correctly and clearly. However, if the ribbon does not rise enough due to loosening of the ribbon, the part that was used for printing the first time will be used again for printing, and the alpha alphabet part of the umlaut character or the underline part of the underline character will become blurred or faded. or In addition, in the case of bold character printing, even if the ribbon is raised accurately by a certain amount, the amount of ribbon feed is extremely small, so for most characters, there is a portion of the ribbon that is printed twice. The above-mentioned blurring etc. frequently occur.

OBJECT OF THE INVENTION An object of the invention is to provide a printing method that can solve the above problems.

Embodiment Hereinafter, an embodiment embodying the present invention will be described based on the drawings. First, the configuration of a typewriter used in the printing method of the present invention will be explained based on FIGS. 2 to 5. A platen 11 is rotatably supported at a predetermined position on a frame (not shown) of the typewriter. ing.

A carriage 13 is supported on a guide shaft 12 installed on the frame so as to be parallel to the platen 11 so as to be movable back and forth along the printing lines of the platen 11.

A cassette holder 15 is supported on the carriage 13 by a support shaft 14 so as to be able to swing vertically, and a ribbon cassette 16 is removably mounted on the upper surface of the cassette holder 15. An electromagnet 18 is fixed on a support plate 17 supported by the support shaft 14.
When the electromagnet 18 is demagnetized,
As shown in FIG. 2, the cassette holder 15 is received on a part of the support plate 17, and the ribbon cassette 1 is held in place.
6 is in the rest position, and its ribbon cassette 16
The outwardly exposed portion of the ribbon 19 housed in the ribbon 19 is located below the printing surface of the platen 11. Also, electromagnet 18
When the cassette holder 15 is excited, the magnetic piece 20 on the lower surface of the cassette holder 15 is attracted to the electromagnet 18, as shown in FIG. opposite.

A character selection motor 21 is fixed on the carriage 13, and a petal-shaped type wheel 22 as a printing element is mounted on the shaft of the motor.
Type 24 is provided at the tip of 3. Further, a printing hammer 25 is attached to the outer frame of the character selection motor 21.

As shown in FIG. 4, a push-down lever 27 is rotatably supported at the intermediate portion of the carriage 13 via a mounting plate 26, and one end of the push-down lever 27 is supported by a spring 27.
When the cassette holder 15 is rotated to the position shown in FIG. 3, one end of this push-down lever 27 is pulled up via a spring 28, and the other end is lowered. do.

As shown in FIG.
and the first gear 31 are fixed. A ribbon feed string 33 is wound around the outer periphery of the take-up pulley 30 and has both ends tied to a portion 32 of the frame of the typewriter. Therefore, the carriage 1
3 is moved to either the left or right along the printing line, the take-up pulley 3 is moved via the ribbon feed string 33.
0 is rotated either left or right.

A second gear 35 is connected to the upper end of a clutch shaft 34 which is supported so that the carriage 13 can move vertically and rotate.
is fixed. Further, the clutch shaft 34 is urged upward by a spring 36 via a second gear 35. A small diameter portion 37 is formed in the middle portion of the clutch shaft 34. Furthermore, the clutch shaft 3
A third gear 38 that always meshes with the first gear 31 is rotatably provided on the outer periphery of the clutch 4, and a roller clutch serving as a one-way clutch is provided between the third gear 38 and the clutch shaft 34. 39 are interposed.

The other end of the push-down lever 27 is opposed to the upper end surface of the clutch shaft 34, and when the cassette holder 15 is placed in the rest position shown in FIG. 2, the other end of the push-down lever 27 is raised. When the clutch shaft 3 is
4 moves upward to connect its small diameter portion 37 and the roller clutch 39.
are opposed to each other, the third gear 38 and the clutch shaft 34 are released, and the third gear 38 is in a state where it can freely rotate regardless of the clutch shaft 34. Furthermore, when the cassette holder 15 is placed in the printing position shown in FIG. contact, the third gear 38 and the clutch shaft 34 are coupled, and only rotation of the third gear 38 in one direction is transmitted to the clutch shaft 34.

A gear portion 4 is attached to the support shaft 40 on the carriage 13.
1, a fourth gear member 42 that always meshes with the second gear 35 is supported so as to be rotatable and movable up and down, and the fourth gear member 42 is urged upward by a spring 43. A connecting recess 44 is formed at the upper end of the fourth gear member 42, and when the ribbon cassette 16 is mounted on the cassette holder 15, a fitting recess 44 connected to the ribbon feeding drive shaft (not shown) of the ribbon cassette 16 is formed. The protrusion 45 is fitted into the connecting recess 44 and the fourth
The rotation of the gear member 42 is now transmitted to the ribbon feeding drive shaft.

Furthermore, although not shown, this typewriter is equipped with dead keys such as umlauts in addition to the character and symbol keys, and also has a bold key and an automatic underline key, which enable bold printing mode and automatic underline printing mode, respectively. You can now choose.

Next, the operation of the typewriter constructed as described above and the printing method using this typewriter will be explained according to the flowchart shown in FIG. In this flowchart, press the Bold key
key, and the automatic underline key is the U key.

Now, normally, as shown in Fig. 2, the electromagnet 18
is demagnetized and the cassette holder 15 is moved to the support plate 17.
The outwardly exposed portion of the ribbon 19 of the ribbon cassette 16 mounted on the cassette holder 15 is at a rest position below the printing surface of the platen 11. For this reason, one end is connected to the spring 2.
The other end of the push-down lever 27 connected to the cassette holder 15 via the lever 8 is raised, and the clutch shaft 34 is moved upward by the spring force of the spring 36.
The roller clutch 39 between the clutch shaft 34 and the fourth gear member 42 is released. Therefore,
Even if the carriage 13 is moved in this state and the take-up pulley 30 is rotated via the ribbon feed string 33, the rotation is only transmitted to the third gear 38 via the first gear 31 and the clutch shaft 34, and the ribbon is not fed.

Next, when the character and symbol keys are operated for printing and a print signal is output, the electromagnet 18 is energized and the cassette holder 1 is energized, as shown in FIG.
5 is swung, and the outwardly exposed portion of the ribbon 19 faces the printing surface of the platen 11. Further, based on the print signal, the character selection motor 21 rotates the type wheel 22 by a required amount, and the desired type 24 is selected.
When the ribbon 19 faces the printing surface, the printing hammer 25 is activated to print the desired characters.

On the other hand, when the cassette holder 15 is swung to the printing position as described above, one end of the push lever 27 is pulled up via the spring 28, the other end of the push lever 27 is moved down, and the clutch shaft is 3
4 is pushed down, and the clutch shaft 34 and the third gear 38 are connected via the roller clutch 39. In this state, after the printing operation is completed, the carriage 13 is moved to the platen 11.
The character is moved one character in the character advance direction along the printed line. In this way, when the carriage 13 is moved in the character feeding direction, the take-up pulley 30 is rotated via the ribbon feeding string 33, and the rotation is the first.
gear 31, third gear 38, roller clutch 3
9, the ribbon is transmitted through the clutch shaft 34, the second gear 35, the fourth gear member 42, and the fitting protrusion 45 of the ribbon cassette 16 to the ribbon feeding drive shaft in the ribbon cassette 16, and the drive shaft is connected to the carriage 13. It is rotated according to the feed. Therefore, the ribbon is advanced by one character and a new portion of the ribbon faces the printing surface. Thereafter, the electromagnet 18 is demagnetized, the cassette holder 15 returns to the position shown in FIG. 2, the push-down lever 27 returns to rotation, and the clutch shaft 34 becomes released. The above operations are repeated every time a character or symbol key is operated.

As described above, the ribbon can be reliably fed by the required amount without using a dedicated motor for ribbon feeding.

Next, when a dead key such as an umlaut is operated, after the umlaut etc. is printed,
With the cassette holder 15 placed in the position shown in Figure 3, the carriage 13 is moved once in the character feeding direction.
Moved by character. Therefore, the ribbon 19 is advanced by one character, and a new portion of the ribbon 19 is located at the printing position. When the stepwise movement of the carriage 13 is completed, the electromagnet 18 is demagnetized and the cassette holder 1 is
5 returns to the position shown in FIG. 2, and in this state the carriage 13 moves one character in the opposite direction. In this case, as described above, the clutch shaft 34 is raised and the roller clutch 39 is released, so that the ribbon is not fed.

Then, after the carriage 13 returns to the umlaut printing position, when any of the character keys O, A, and U is operated, the selected character is printed in the same manner as described above. Thereafter, the carriage 13 is moved one character step in the character advance direction.

As described above, after the umlaut is printed, the ribbon is fed, the new part is located at the printing position, and the alpha alphabet is printed in this state, so that the printed parts do not overlap on the ribbon 19. The printed characters will not be blurred or faded.

Also, when the bold key (B key) or automatic underline key (U key) is operated, bold printing mode and automatic underline printing mode are selected respectively, and when character and symbol keys are operated in this state, First, the electromagnet 18 is energized so that the ribbon faces the printing surface, and the manipulated characters and
Printing is performed using printed characters that correspond to the symbol keys.
Then, the carriage 13 is moved 1 in the character feed direction.
After moving the ribbon 19 by one character, the electromagnet 18 is demagnetized and the cassette holder 15 is moved.
returns to the position shown in FIG. 2, and the carriage 13 moves in the opposite direction to the character feeding direction. At this time, if the bold printing mode is selected, the amount of return of the carriage 13 in the reverse direction is slightly less than one character pitch, and if the automatic underline mode is selected, the amount of return of the carriage 13 in the opposite direction is slightly less than one character pitch. It is one character pitch.

When the return of the carriage 13 is completed, the electromagnet 18 is energized again and the ribbon 19 faces the printing position, and the same character as the first character or an underline is printed. Therefore, bold or underlined characters shown in FIGS. 1b and 1c are printed. In this case as well, before the second printing, the ribbon is fed based on the movement of the carriage 13 and a new portion of the ribbon 19 is positioned at the printing position.
The characters printed the second time will not be blurred or faded.

To cancel the bold print mode and automatic underline print mode, simply operate those keys again.

Effects of the Invention As exemplified in the embodiments above, the present invention provides that when a printing operation is performed by pressing down a dead key or pressing down a character key in bold print mode or automatic underline mode, After moving the required amount from that position, move it again to the predetermined position, perform the ribbon feeding operation, and perform the printing operation for the remaining characters following the dead key or the remaining bold printing or the underline. This has the effect of reliably preventing blurring, etc., and ensuring clear printing at all times.

[Brief explanation of drawings]

Figure 1 a, b, and c are umlaut characters, respectively.
Figures 2 to 5 showing bold characters and underline characters show a typewriter in which the printing method of the present invention is implemented, and Figures 2 and 3 show the ribbon cassette in its rest position, respectively. , FIG. 4 is a side sectional view showing the push-down lever, FIG. 5 is a sectional view showing the ribbon feeding mechanism, and FIG. 6 is a printing embodying the present invention. This is a flowchart of the method. Platen...11, Carriage...13, Ribbon cassette...16, Type wheel...22.

Claims (1)

[Scope of Claims] 1. The carriage 13 on which the ribbon cassette 16 and the printing element 22 are placed advances one character at a time along the printing line of the platen 11 each time a printing operation is performed, and the carriage related to the printing operation moves one character at a time. 1
In a typewriter configured so that the ribbon feeding operation of the ribbon cassette 16 is performed based on the stepwise movement of step 3, the ribbon feeding operation of the ribbon cassette 16 is performed multiple times at the same printing position or at a moving position smaller than the stepwise movement amount for one character. When performing a printing operation, when the first printing operation is performed, the carriage 13 is moved from that position by a necessary amount, and then moved to a predetermined printing position again to perform the ribbon feeding operation. A typewriter printing method that performs a second printing operation.