JPS60166478A - Erasing device for typewriter - Google Patents

Abstract

PURPOSE:To enable a mistyped part to be completely erased even where the position of a carriage and a printing paper are staggered a little from each other, by providing an erasing type having a flat face part the area of which is larger than those of various characters or symbols used for printing. CONSTITUTION:A hammer 32 impacts a type 35 against a platen 38 from the back side of the type 35, whereby printing is conducted when an ink ribbon 18 is intermediately provided between a printing paper 39 and the type 35. A type wheel 28 is provided with the erasing type 35'. The type 35' is provided with a face part 35A which is substantially flat and, correctly speaking, curved at a radius of curvature equal to that of the platen 38. Accordingly, when the erasing type 35' is impacted by the hammer 32, the entire surface of the face part 35A is pressed against the platen 38 through a correction tape 22, thereby completely erasing the mistyped character or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an erasing device for erasing characters and symbols printed by a typewriter.

[Prior art]

Most typewriters use an erasing tape called a collect tape and are equipped with an erasing device. When a mistype occurs, the operator moves the carriage backward to impact the type on the collect tape at the location where the mistype occurred. At this time, the mistyped typeface is used again. When the collection tape is impacted, the ink printed on the printing paper adheres to this tape and is peeled off. Some corrector tapes erase characters and symbols by attaching white ink to the tape.

However, in such conventional erasing devices, if the positional relationship between the carriage and the printing paper becomes misaligned for some reason, mistyped characters and symbols remain unerased. 1st
The figure shows an example of this, where the outline of the letter rHJ surrounded by a solid line represents the printed part, and the outline surrounded by a broken line represents the part erased with the correct tape. The diagonally shaded area 11 that is different due to the shift becomes the unerased portion.

[Purpose of the invention]

In view of these circumstances, an object of the present invention is to provide an erase device for a typewriter that can completely erase mistyped characters and symbols even if the positional relationship between the carriage and the printing paper is slightly misaligned. do.

[Structure of the invention]

In the present invention, a flat printing area wider than the area occupied by the various characters and symbols to be printed is made by using erase type letters and a hammer A474 that slams the erase type letters into the mistyped area via a collector tape. Equipped with the erase device of a typewriter.Since the printing part of the erase type sufficiently covers the area occupied by mistyped characters and symbols, even if the positional relationship between the carriage and the printing paper is slightly misaligned, the mistyped part can be completely erased. I can leave.

〔Example〕

The present invention will be described in detail below with reference to Examples.

FIG. 2 schematically shows the circuit configuration of a typewriter using the erasing device of this embodiment, and FIG. 3 shows the erasing device and its peripheral parts. In FIG. 2, the main control unit 12 connects -C; q+
Connected to x minutes. The '3ROM (read only memory) 14 stores a program for controlling the main control section 12. The keyboard 15 has a large number of keys 111 for manually inputting characters and symbols and various control signals. The ribbon control section 16 controls the ribbon drive section 17 to control the drive of the ink ribbon 18 (Fig. W'3). The collect tape control unit 19 controls the collect tape drive unit 21 to control the drive of the collect tape 22. The carriage control section 23 controls the carriage drive section 24 to control the drive of the carriage 25.

The print wheel control section 26 controls the print wheel drive section 27 and controls the drive of the print wheel 28. The hammer control section 29 controls the hammer driving section 31 to control the driving of the hammer 32.

The print wheel 28 is also called a type wheel, and has typefaces 35 formed at each tip of flexible spokes 34 extending radially from the center of rotation 33. The print wheel 28 is rotated to a desired position by a servo motor or pulse motor 37 equipped with a position detector 36 to select a spoke for the hammer 32. The hammer is designed to strike the type 35 from the back side toward the platen 38. , 2, if the ink ribbon 18 is interposed between the printing paper 39 and the characters, printing is performed, and the collection tape 2
If 2 is present, characters and symbols will be erased.

By the way, the print wheel 28 has the erase type 3.
One 5' is placed. The erase type 35' is
As shown in FIG. 4 (Δ), the printed portion 35A on which characters or the like are to be engraved is substantially flat. As shown in FIG. 3B, the printed portion 35Δ forms a slight MM curve, which is exactly equal to the curvature of the platen 38. This means that when this erasing type 35' is struck with a hammer,
This is to ensure that the entire surface of the printed portion 35Δ is brought into pressure contact with the platen 38 via the collection tape 22.

The operation of the erase device will be explained next.

Suppose that while typing using the keyboard 15, the character rHJ is mistyped. In this case, the operator presses an erase key (not shown) on the keyboard 15. The main control section 12 sends a backward instruction signal to the carriage control section 23 as many times as the erase key is pressed, and causes the carriage 25 to move backward one pitch at a time. Also, the ribbon control section 17
A tape raising instruction signal is sent to the collect tape controller 19, and the ink ribbon 18 and collect tape 22 are moved upward by a predetermined amount. As a result, the collect tape 22 is set at a position corresponding to the hammer 32.

When an execution key (not shown) on the keyboard 15 is pressed in this state, the print wheel control section 2G selects the erase type 35', and then the hammer control section 29 operates the hammer drive section 31, Impact type 35'.

As shown in FIG. 5, at this time, the printed portion 41 comes into pressure contact with an area slightly wider than the character [-H].

Therefore, even if the printing position is slightly shifted, the character rl (l is completely erased. After this printing operation, the collect tape control section 19 moves the collect tape 22 by one pi/notch. The ribbon control section 16 and the collect At the same time, the tape control section 19 returns the ink ribbon 18 and the collection tape 22 to their original positions.In this way, the entire erase operation is completed.

In the example, a typewriter equipped with a print wheel was explained, but a type ball, type cylinder,
The present invention is similarly applicable to typewriters equipped with other print heads such as Kuiphar.

〔Effect of the invention〕

As explained above, according to the present invention, since the erase type is provided, it is sufficient to always use this type when erasing a mistype, and there is no need for a mechanism to memorize and select the type that has been mistyped.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an example of characters left unerased by a conventional erase device, and FIGS. 2 to 5 are for explaining an embodiment of the present invention. FIG. Figure 3 is a perspective view showing the main parts of this printer, Figure 4 (Δ) is a front view of erase type,
FIG. 5B is a side view, and FIG. 5 is an explanatory diagram showing the relationship between the printed portion of the erase type and the mistyped characters. 15...Keyboard, 22...Collect tape, 32...Hammer, 35'...Erasing type, 41...Printing part. Applicant Fuji Xerox Co., Ltd. Representative Patent Attorney Umeo Yamauchi

Claims (1)

[Claims] It is characterized by being equipped with erasing type having a flat printing area wider than the area occupied by the various characters and symbols to be printed, and a hammer mechanism that slams the erasing type onto the mistyped area via a collect tape. Typewriter erasing device.