JPS59215887A - Printer - Google Patents

Abstract

PURPOSE:To enable to completely erase a printed character even when the position of the character and the position of a type are staggered slightly from each other at the time of erasing the character, by a method wherein a type provided with a base for erasing along side edges of a pattern of the type is used, and an impacting force at the time of erasing is set to be stronger than that at the time of printing. CONSTITUTION:The base 102 for erasing having a width W2 larger than the width W1 of a type part 101 is provided along the side edges of the pattern of the type part 101 on a type base 103. When printing by using the type thus constructed, a printing hammer is operated with such a force that only the type part 101 impacts an ink ribbon 13 against a printing paper 43, thereby transferring an ink provided on the ink ribbon 13 onto the paper 43. When erasing, the hammer is operated with an impacting force stronger than that at the time of printing, thereby causing the base 102 for erasing to impact a correction ribbon 33 against the paper 43 together with the type part 101.

Description

TECHNICAL FIELD The present invention relates to a printer, and more particularly to a printer in which an ink ribbon for printing and a correction ribbon for erasing are moved up and down and struck by type to erase printing or erroneous printing.

Prior Art The structure of a conventional printer of this type is shown in FIGS. 1 to 4.

In FIG. 1(a), 12 is an ink and a ribbon cassette 1.
This is a pin integrated with 1 and is a part that engages with a cam 21, which will be described later.

An ink ribbon 13 is exposed between both ends of the cassette 11, and is positioned between the printing paper 43 wound around the platen 16 and the type 17 during printing. (Figure 3(b)
) The cassette 11 supported by the support shafts 14 and 15 is configured such that its tip can move up and down in the direction of the arrow A shown in FIG. 1(a). When it moves up and down, the ink ribbon 13 exposed between both sides of its tip also moves up and down at the same time.

A printing hammer 18 is installed at a position facing the platen 16, and a type 17 is arranged between the platen 16 and the printing hammer 18. In the examples shown in Fig. 1(a) and Fig. 3, for the sake of clarity, the type 1
Although only one 7 is shown, in reality there are many, such as a daisy wheel type type wheel.

Reference numeral 22 shown in FIG. 1(b) is a cam surface provided on the cam 21, and 23 is a splash portion on which a spring 26 is applied to return the cam 21.

As shown in FIGS. 2(a) to 2(c), the cam 21 is supported by a cam shaft 25, is installed so that it can rotate around this shaft 25, and is always rotated clockwise in the drawing by a spring 26. The ribbon solenoid 41, which will be described later, is under tension.
Pushed in the direction of arrow B, the pin 12, which is integral with the cassette 11, comes into contact with any part on the cam surface of the cam 21.

24 is the highest part of the cam surface, which is the point farthest from the center of the camshaft 25; 28 is the lowest cam surface, which is the closest point;
Reference numeral 7 denotes a retaining wall that prevents the pin 12 from separating from the cam surface when the pin 12 moves toward the cam surface 24.

In FIG. 1(a), on the lower side of the cassette 11, arms 31 and 31 are integrally formed on the left and right sides (however, the right side is not shown).
A take-up spool is installed on the arm 31 on the right side (not shown), guide boos IJ 34 , 34 (the right side is not shown) are provided to stretch the correction ribbon 33, and a ribbon solenoid 41 is also installed on the arm 31.

Reference numeral 42 denotes a correction solenoid that is energized when the correction ribbon 33 is opposed to the front surface of the type 17. When energized, the correction solenoid 42 moves the arm 31, which is pivotally supported by the arm shaft 36, upward, thereby causing the correction ribbon 33 to move upward. Move it upward.

Moreover, 35 is fixedly installed on the arm 31 or is a lid for pushing up the lower surface. As a result, the ink ribbon 13 also moves upward.

Next, the operation of the conventional device configured as above will be explained.

The state shown in FIG. 3(a) is the ribbon solenoid 4 (not shown).
The excitation of the ink ribbon 1 at the tip of the arm 11 is cut off.
3 is lowered from the type 17, and the correction solenoid 4
2 is not excited and the arm 31 is also in a lowered position, which is a standby state during non-printing.

FIG. 3(b) shows the printing state, in which the ribbon solenoid 41 (not shown) is energized so that the state shown in FIG. 2(a) changes from the state shown in FIG. 2(1) in the direction of arrow B. cam 2
1 is pushed up and the highest cam surface 24 contacts the pin 12, the tip of the cassette 11 rises and the ink ribbon 13 faces the type 17, and by the operation of the print hammer 18, the type 17 and the ink ribbon 13 are removed from the printing paper. Printing is performed by instantaneous error on 43.

What is shown in FIG. 4(a) is to explain a situation where the type width W1 of the type 17 is struck against the ink ribbon 13, and the ink on the ribbon 13 at the portion of the type width W1 is applied to the printing paper 43. This shows the state of transfer.

When printing is completed, the solenoid 41 is de-energized, the pressing force in the B direction is reduced, and the return spring 26 causes the cam 21 (r
i Returns to the original state shown in FIG. 2(a), and the leading end of the cassette 11 also lowers, returning to the standby state shown in FIG. 3(a).

If you find that there is an error after printing on the printing paper 43 and want to erase it, the correction solenoid 42 is energized to raise the arm 31 and the correction ribbon 33 aligns with the type 17 as shown in FIG. 3(C). Make them face each other. Then print-
- Activate the printer 18 and strike the same type 17 as used during printing via the correction ribbon 33 at a position on the printing paper 43 that overlaps with the character to be erased.

Thereby, erasing can be performed in two ways: by peeling off the already printed characters onto the correction ribbon 33, or by hiding the already printed characters by transferring the white ink on the correction ribbon onto the vertically printed characters.

In any of the above methods and cases, when erasing already printed characters, the printed characters 17 are struck by the hammer 18 together with the correction ribbon 33 onto the vertically printed characters with the vertical and horizontal directions and inclination completely matching. There must be.

If the impact position of the type 17 and the position of the already printed characters are even slightly shifted, the already printed characters will remain on the printing paper 43 without being able to be erased by the amount of the shift.

Even if there is a slight play (backlash) in each operating mechanism of the printer, there is a possibility that it will not be completely erased using the conventional method of erasing already printed characters as described above, and that it may remain without completely erasing the vertically printed characters. Erasure is nearly impossible.

Purpose The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional technology, and even when the overlap between vertically printed characters and printed characters is slightly shifted during erasing, complete erasing can be easily achieved. The purpose is to provide printers.

EXAMPLES The present invention will be described in detail below based on examples shown in the drawings.

Figure 5 (a1 to Figure 5 (C)) show the structure of a type according to an embodiment of the present invention. along,
It has an erasing pedestal 102 having a width W2 wider than the width W1 of the type portion 101, and has a portion 103 at its base that corresponds to a conventional type pedestal.

During printing, as shown in FIG. 5(a), the type part 101
The printer operates the printing printer 18 with enough force to strike the ink ribbon 13 onto the printing paper 43, and the ink ribbon 1
The ink on 3 is transferred onto printing paper 43.

In addition, when erasing, as shown in FIG. 5(b), the impact force of the printing hammer 18 is made larger than during printing, and
01, the erasing pedestal 102 is also operated to strike the correction ribbon 33 onto the printing paper 43 so that the width portion indicated by W2 bites into the correction ribbon 33.
If the correction ribbon 33 is of a tear-off type, it is torn off at a width W2 that is wider than the width W1 of the turn of the vertically printed characters, so that the vertically printed characters and the type part 10 when erased are removed.
Even if the striking position of No. 1 deviates slightly for some reason, it is concealed by the already marked W2, so that the entire part is surely erased.

FIG. 6 is a block diagram showing the above-mentioned print/71 drive control device, in which 201 is a print key, which is connected to a control circuit 203 together with an erase key 202 for instructing erasure of vertically printed characters.

The control circuit 203 controls these print keys 201 and erase keys 2.
According to the command 02, the drive of the print hammer drive section 206 is controlled via the driver 205 connected to the power supply circuit 204.

The configuration itself of the printing hammer drive control device described above is almost the same as the conventional one, but in this embodiment, the control circuit 203 controls the erase key 20 more than the print key 201 input.
In the case of input No. 2, control is performed so that the printing pressure of the print mark 206 is greater. As a control method in this case, for example, there is a method of increasing the drive voltage of the print hammer drive unit 206 during erasing.

Effects As is clear from the above explanation, according to the present invention, the type is provided with an erasing pedestal along the side edge of the pattern of the type part, and the type is hit with a greater pressure during erasing than during printing. Since the eraser is configured to do this, even if the position of the printed character that should overlap the vertically printed character is slightly shifted during erasing, the entire vertically printed character to be erased can be surely erased.

[Brief explanation of the drawing]

Figures 1 to 4 explain the configuration and operation of the main parts of a conventional printer. Figure 1 (a) is a perspective view of the main parts of the printer, and Figure 1 (b) controls the movement of the cassette. 2(a) to 2(C) are explanatory diagrams showing the operation of the cam, and FIG. 3(a) to 3(C) are perspective views of the cam, respectively.
4(a) is a schematic side view showing the state of the main parts of the printer at time, printing, and erasing, respectively; FIG.
Figure 4 (I)) is a perspective view of type in a conventional printer;
Figures 5 to 6 provide detailed explanations of the present invention, and Figure 5 (a)
) is a cross-sectional view showing the state of printing by type in the example;
FIG. 5(b) is a sectional view showing the erasing state, FIG. 5(c) is a perspective view of the type, and FIG. 6 is a block diagram showing the configuration of the printing hammer drive control device. 11... Ink ribbon cassette 12... Pin 13
... Ink ribbon 14.15 ... Support shaft 16 ...
・Platen 17...Print 18...Print No. 1
Arm 21...Cam 31...Arm 3
3... Correction ribbon 41.42... Solenoid 4
3... Printing paper 101, type section 102, erasing pedestal 201... printing key 202, erasing key 203... control circuit 204... power supply circuit 205... driver 206... printing...
Canon Inc. Figure 1 (a) Figure 1 (b) 2 20 Figure 4 (0) Section 4! I(b) 43 Figure 5 (Q) Figure 5 (b) Section 5
0(C)

Claims (1)

[Claims] In printers that erase printing or erroneous printing by selectively striking an ink ribbon for printing and a correction ribbon for erasing with type, an erasing pedestal is formed along the side edge of the pattern of the type area, and the erasing pedestal is A printer characterized in that the impact force of type is greater than that during printing.