JPS5839488A - Printing by typewriter - 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 - Is this invention a ribbon skein? A carriage on which a print element and a printing element are placed performs a printing operation while moving along a printing line on a platen, and a ribbon feeding operation of a ribbon cassette is performed based on the movement of the carriage in conjunction with the printing operation. This typewriter relates to a printing method using the typewriter.

Prior Art In this type of typewriter, as described above, the ribbon feed is performed based on the movement of the carriage, and this movement is used as a drive source, so a motor dedicated to the ribbon feed is unnecessary and the structure is simple. has the advantage of

However, in the type 'Uta' configured in this way, umlaut characters, bold characters (thick characters), and underline characters shown in Figures 1 (a) to (0) are printed. In some cases, these characters may not be printed correctly and some or most of the printed characters may become blurred or faded.

Tsumashi and umlaut characters are those in which any of the letters A, O, or U are printed below the umlaut Q print grip, and bold characters are those in which the same alphabet is printed after one alphabet is printed. are printed so that they are overlapped with a slight shift, and furthermore, in the case of underline characters, after the alphabet is printed, an underline is printed below it. 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 in front of the text. That is, when printing umlaut characters and underline characters, the carriage does not move at all, and 9. Although the carriage does move when printing letters on the paper, the amount of movement is very small. Therefore, when printing umlaut characters and underline characters, the ribbon is not fed at all.
In the case of bold letters, only a very small amount is sent.

On the other hand, the ribbon is always placed at a rest position below the printing surface of the platen, and reaches a printing position facing the printing surface when printing is performed.''-: '11. It is something that will be done. Therefore, when printing umlaut characters and underline characters, if the ribbon always rises by a certain amount accurately from the resting 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, due to looseness of the ribbon etc.
If the ribbon does not rise enough, the part that was used for printing the first time will be used for printing again, and the alphabet part of the umlaut character or the underline part of the underline character will become blurred or faded. . In addition, in the case of Paul/Rudo character printing, even if the ribbon is raised accurately by a certain amount, the amount of ribbon feed is extremely small, so most characters are printed twice on the ribbon. There are some areas where the scratches occur, and the above-mentioned scratches and the like frequently occur.

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

EXAMPLE Hereinafter, an example embodying the present invention will be described based on the drawings. First, the structure of a typewriter used in the printing method of the present invention will be explained with reference to FIGS. has been done.

A carriage 13 is supported by 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 mounted on the support plate 17 supported by the support shaft 14.
are alumnus.

When the electromagnet 18 is demagnetized, a cassette holder 15 is attached to a part of the support plate 17 as shown in FIG.
is received, the ribbon cassette 16 is located at the rest position', and the ribbon 1 stored in the ribbon cassette 1-16 is
9 is located below the printing surface of the platen 11. Also, when the electromagnet 18 is excited, the magnetic piece 20 on the lower surface of the cassette holder 15 is attached to the electromagnet 18, as shown in FIG. By being attracted, the cassette holder 15 is swung, and the externally exposed portion faces the portion/face.

A character selection motor 21 is fixed on the carriage 13, and a petal-shaped type wheel 22 as a printing element is attached to the motor shaft.
Letters 24 are provided at the tips of a large number of radial arms 23. Further, a printing hammer 25 is attached to the outer frame of the character selection motor 21.

As shown in FIG. 4, a lever 27 is rotatably supported in the carriage 13 via a mounting plate 26 at an intermediate portion thereof, and one end of the lever 27 is connected to the cassette holder 15 via a spring 28. , cassette holder 1
5 is rotated to the third position, one end of the push-down lever 27 is pulled up via the spring 28, and the other end is lowered.

As shown in FIG. 5, a winding guide 3° and a first gear 31 are fixed to a four-digit shaft 29 rotatably supported by the carriage 13. Take-up shift'-! A ribbon feeding string 33 is wound around the outer periphery of the ribbon 330.The ribbon feeding string 33 has both ends tied to a part 32 of the frame of the tie lighter.

Therefore, when the carriage 13 is moved to the left or right along the printing line, the take-up pulley 30 is rotated to the left or right via the ribbon feed string 33.

A second gear 35 is fixed to the upper end of a clutch shaft 34 that is supported so that the carriage 13 can move vertically and rotate. Also, the second clutch shaft 34vi spring 36
is biased to one side through the gear 35. A small diameter portion 37 is formed in the middle portion of the clutch shaft 34 . Further, a third gear 38 that always meshes with the first gear 31 is rotatably provided on the outer circumference VC of the clutch shaft 34, and between the third gear 38 and the clutch shaft 34, ~
A roller clutch 39 serving as a directional clutch is interposed.

The other end of the push-down lever 27 faces the upper end surface V of the clutch shaft 34, and the cassette holder 1
5 is placed in the rest position shown in FIG.
When the other end of 7 is raised, the clutch shaft 34 is moved upward by the spring force of the spring 36, and the small diameter portion 37 and the roller clutch 39 are opposed to each other, and the distance between the third gear 38 and the clutch shaft 34 is increased. When released, the third gear 38 becomes in a state where it can freely rotate regardless of the clutch shaft 34.

Further, 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 connected, and only the rotation of the third gear 38 in one direction is transmitted to the clutch *1h34.

On the support shaft 40 on the carriage 13, there is a fourth gear member 4 that always meshes with the second gear 35 in the gear portion 41.
2 is rotatably and vertically movably supported, and the fourth
The 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. When the 011B ribbon cassette 16 is loaded into the cassette holder 15, a ribbon feeding drive shaft (not shown) for the ribbon cassette 16 is formed. The static mating protrusion 45 connected to the ribbon is fitted into the connecting recess 44, and the rotation of the fourth gear member 42 is transmitted to the ribbon feeding drive shaft.

Furthermore, although not shown, this typewriter can
In addition to the symbol keys, there are keys such as umlauts, and the bold key and automatic underline key allow selection of a bold print mode and an automatic underline print mode, respectively.

Next, the operation of the typewriter configured as above,
The printing method using this typewriter will be explained according to the flowchart shown in FIG. In this flowchart, the B key is pressed for the bold key, and the U key is pressed for the automatic underline key.

Now, normally, as shown in FIG. 2, the electromagnet 18 is demagnetized and the cassette holder 15 is received by the support plate 17.
The outwardly exposed portion of the ribbon 19 of the ribbon cassette door 16 mounted on the cassette holder 15 is at a rest position below the printing surface of the platen 11. Therefore, the other end of the push-down lever 27, whose one end is connected to the T-set holder 15 via the spring 28, is raised, and the clutch shaft 34 is moved upward by the spring force of the spring 36. The roller clutch 39 between the fourth gear member 42 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 feeding cord 33, the rotation is transmitted to the third gear 38 via the first gear 31. The ribbon is not transmitted to 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 excited and the cassette holder 15 is swung, as shown in FIG.
The outwardly exposed portion 9 faces the printing surface of the platen 11. Further, when the type wheel/L/22 is rotated by the required amount by the character selection motor 21 based on the print signal to select the desired type 24 and the ribbon 19 faces the printing surface, the print hammer 25 is activated. Then, printing is performed using the required characters.

On the other hand, when the cassette holder 15 is swung to the printing position as described above, one end of the push-down lever 27 is pulled up via the spring 28, and the push-down 1rf V/<-
The other end of 27 moves downward, and the clutch shaft 34 is pushed down.
The clutch shaft 34 and the 30th gear 38 are connected via the roller clutch 39. In this state, after the printing operation is completed, the carriage 13 is moved forward by one character in the character feeding direction along the printing line of the platen 11. As described above, 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 caused by the first gear 31, the third gear 38, the roller clutch 39, The ribbon cassette 16 is connected to the clutch shaft 34, the second gear 35, the fourth gear member 42, and the ribbon cassette 16 through the fitting protrusion 45 of the ribbon force set 16.
This signal is transmitted to the ribbon feeding drive shaft in the inner ribbon feeding shaft, and the driving shaft is rotated in accordance with the feeding of the carriage 13. 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.
rotates back, 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, the carriage 13 is moved once in the character feeding direction with the set holder 15 placed in the position shown in FIG. Moved by character. Therefore, the ribbon 19 is advanced by one character, and a new portion of the ribbon 19 is located at a printing position. When the stepwise movement of the carriage 13 is completed, the t=rb stone 18 is demagnetized 17 and the cassette holder 15 is returned to the position shown in FIG. 2, and in this state the carriage 13 is moved in the opposite direction by one character. 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 gear horn V'L3 returns to the umlaut printing position, 0. When either the A or U character key is operated, the selected character is printed in the same manner as described above. Thereafter, the carriage 13 is moved forward by one character in the character feeding direction.

As described above, after the umlaut is printed, the ribbon is fed and the new part is located at the printing position, and the alphabet is printed in that state, so the printed parts overlap on the ribbon 19. There is no problem, and the printed characters are not blurred or faded.

Also, when the bold key (B key) or the automatic underline key (U key) is operated, the print mode, print mode, automatic underline print mode and automatic underline print mode are selected, respectively.
When a character or symbol key is operated in this state, the electromagnet 18 is first excited and the ribbon faces the printing surface.
Printed markings corresponding to the operated characters and symbol keys! will be held.

Then, once the carriage 13 moves one character in the character feeding direction and the ribbon 19 is fed one character, the electromagnet 1
8 is demagnetized and the cassette holder 15 returns to the position shown in FIG. 2, and the carriage 13 moves in the opposite direction to the one-character feeding direction. At this time, if the bold printing mode is selected, the amount of return of the gear ridge 13 in the reverse direction is less than one character pitch, and if the automatic underline mode is selected, the amount of return of the gear ridge 13 in the reverse direction is less than one character pitch. 1
This is the 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 characters or underline characters shown in FIGS. 1(b) and 1(C) are printed. In this case as well, before the second printing, the ribbon is fed based on the movement of the gear ridge 13 and a new part of the ribbon 19 is located at the printing position, so the second printing characters may not be blurred or faded. There isn't.

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 by pressing down a character key force in bold printing mode or automatic underline mode, After moving the carriage from that position by the required amount, move it again to the specified position, perform the ribbon feeding operation, and print the character following the dead key or the bold Jl or underline. This has the effect of reliably preventing blurring of printed characters and ensuring clear printing at all times.

[Brief explanation of the drawing]

Figures 1 (a), (b), and (c) are diagrams showing umlaut characters, bold characters, and underline characters, respectively;
5 to 5 show a typewriter in which the printing method of the present invention is implemented, and FIGS. 2 and 3 show the side in which the ribbon cassette is placed at the rest position and the printing position, respectively. 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 flowchart of a printing method embodying the present invention. Latin 11. Carry Fuji 13. Ribbon cassette 1
6. Type Hoinobi 22゜ Patent Applicant Brother Industries, Ltd. Agent/Person
Patent Attorney On 1) Hironori (a) (
C) Mouth = 22222 (b)

Claims (1)

[Claims] l A carriage (13) on which a ribbon force set (16) and a printing element (22) are mounted performs a printing operation while moving along the printing line of the platen (11). In a typewriter configured so that the ribbon feeding operation of the ribbon cassette (16°) is performed based on the movement of the carriage (13) in conjunction with the printing operation, when a dead key is pressed down or when the baud/l/ When a printing operation is performed by pressing down a character key in print mode or automatic underline mode, the carriage (13) is once moved by the required amount to that position, and then moved again to a predetermined printing position, The typewriter printing method, wherein the ribbon feeding operation is performed and the remaining printing of characters following the dead key or bold printing or underline printing is performed.