JPS6036182A - Printer - Google Patents

Abstract

PURPOSE:To completely delete a printed image when deleting the image, by a method wherein a type is widened in cross-sectional area toward a body, while a controlling means is provided for changing an impact pressure of a printing hammer driving means between printing time and deleting time, and the impact force of the printing hammer at the time of deleting is set to be larger than that at the time of printing by the controlling means. CONSTITUTION:Bevels of the type are tapered to be widened from the face toward a body plate, and an output from a printing hammer driving means is changed between printing time and deleting time so that the printing hammer is controlledly driven with a larger force at the time of deleting than at the time of printing. Namely, the type 35A is provided with a gradient from the face 35C toward the body plate 35B by tapering the bevels 35D of the type 35A. In using the type, when an output signal from a deletion commanding key 42 is supplied, a controlling circuit 43 supplies a controlling signal to a driver 44 so that the printing hammer 4 is supplied with a driving voltage higher than that supplied when an output signal from a printing commanding key 41 is supplied. Accordingly, when a deleting command is received, the printing hammer 4 impacts a type body 5 with an impact pressure higher than that in the case of printing, thereby completely deleting a printed character.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to printers such as typewriters and word processor printing devices, and more particularly to a printer capable of erasing predetermined prints such as prints recorded by mistake.

[Prior art]

As a conventional printer of this kind, there is one shown in FIG. 1, for example. Here, 1 is an ink ribbon cassette that is rotatable around the support shaft 2, and unless printing is performed in the printer, the cassette 1 is maintained in a horizontal position as shown in the figure. Reference numeral 3 designates a platen on which printing paper (not shown) is held in a wound state, and a printing platen is provided at a position facing the printing position on the platen 3, and a printing hammer is connected to the platen 3. The typeface S to be printed is placed between them.

Although one typeface j is shown in this figure to simplify the explanation, in reality, for example, a plurality of typefaces formed on each spoke of a petal-shaped wheel may be used. be done. B is an ink ribbon stretched at the tip position facing the platen 3 of the cassette/.When printing is not performed, the ribbon 6 is retracted to a position below the typeface J together with the cassette L as shown in this figure. I am made to do so.

7 is a cam engagement bin fixed inside the cassette l, and t is a cam member slidably engaged with the engagement bin 7. The rotational movement of the cam member has the effect of lifting the tip of the cassette holding the di-ink ribbon≦ to the printing position.

As shown in FIG. 2, the cam member g has a cam surface A that engages with the engagement shaft 7, and is rotatably supported on the main body (not shown) via the cam shaft D. The hook gB is a 11-spring hanging hook, as shown in Fig. 3 (4) to (0).
A return spring /θ is hooked between and the main body side. Also,
gc is a push-up surface provided on the cam member r.

Furthermore, a ribbon solenoid // is provided below the cam member r, as shown in FIG. 3. Push up in the direction of the arrow as shown in Figure (B). Therefore, the cam member zone is rotated counterclockwise from the state shown in FIG. 3 (4) in one rotation direction against the spring force of the spring /θ, and the engagement pin 7 is slid along the cam surface IrAlc. By doing so, the leading end of the cassette l is pulled up together with the ribbon t to the printing position.

Note that the cam surface rA of the cam member is shown in FIG. 3(B).
The retaining pin 7 is formed in a groove shape so that vertical movement of the retaining pin 7 is suppressed in the printing state.

Next, the erasing mechanism of the printer, that is, the mechanism for erasing erroneous printing will be explained.

In Figure 1, "〃" is an arm plate connected by a connecting shaft and arranged symmetrically, and the arm plate placed on the left side is not shown. However, these symmetrical arm plates are connected to the connecting shaft 2/
It is pivoted around it so that it can rotate at the same time.

n is a lid that protrudes upward from the arm plate blade, and when erasing characters as will be described later, the cassette/ can be moved to the erasing position via this lifter n. n is a correction solenoid for erasing operation placed below the arm plate; by energizing this solenoid 3, the cassette / is rotated to the erasing position to t together with the arm plate via the arm plate. can be done.

Further, a ribbon spool 2 is provided on the arm plate blade, and a corrected ribbon spool 2 is provided between the ribbon spool 2 and the take-up spool provided on the other arm plate (not shown) via a guide pulley B.
is stretched, and when erasing characters, this correction ribbon is lifted together with the arm plate and positioned in front of the typeface j, that is, on the platen 3 side.

Next, the printing operation of the printer configured as described above will be explained first. When the ribbon solenoid l/ is energized by a print command in the standby state where no printing is performed as shown in Figs. 1 and 3 (70), the solenoid l/
, the cam member r is rotated, and its cam surface, rA
The engagement pin 7 is slid to the upper position shown in FIG. 3(B).

This operation can be further repeated by 2K'1 Figures (4) and (B)
To explain this, by moving the engagement bin 7 from the standby state shown in Figure (4) to the upper position as described above, the cassette is rotated to the position shown in Figure (B). and guides the ink ribbon B held in the cassette between the type S and the printing paper 3θ on the platen 3.

Therefore, printing is performed on the paper 3θ via the printing hammer 5 shown in FIG. Figure 3 (A) and Figure 3 ((
91), and the ink ribbon 6 is also retracted downward at the same time, making it possible to visually confirm the print.

In addition, in such a printing operation, erasure t2. ．． ．． The arm plate 2θ having the structure is held as it is as shown in FIG. 1(B).

Next, the erasing operation in the printer will be explained.

Now, after printing has been performed, if the state returns to the waiting state as shown in Figures 1, 3 (4), and 1 (4), and it is necessary to erase the characters that have already been printed. , correction solenoid n is energized by the erasing command.
As shown in Fig. f (G), the correction ribbon, which is rotated around the connecting shaft and held at its tip by a pulley 25 or the like, is guided between the paper 3θ and the type body S.

Also, at this time, the upper lid on the arm plate blade is
Since the ink ribbon is pushed upward, the ink ribbon held in the cassette can be retracted further upward from the printing position. Thus, the printing hammer shown in FIG. 1 is used to type the same typeface j onto the character to be corrected, and the erasing function of the correction ribbon makes it possible to erase the corrected character from the paper 3θ.

Furthermore, in the demagnetized position described above, the retaining pin 7 is in the demagnetized position as shown in FIG.
), it is located at an upper position away from the cam surface fA of the cam member g. Furthermore, when the demagnetization is completed, the correction solenoid n is demagnetized, so that both the cassette l and the arm plate are returned to their original standby states.

The degaussing operation is performed by overlapping the same typeface j at the printing position as described above, and two methods are normally used for this purpose. The first method is to transfer the ink of the characters printed on the paper 3θ onto the correction ribbon U by this typing, and the λ method is to transfer the demagnetized Kawaguchi ink on the correction ribbon A onto the print. By doing so, characters that have already been printed are hidden, and in either case, characters that have been erroneously printed due to overprinting are erased.

FIG. 3 shows an example of a type used for such a blink type body S, in which the convex portions sh are the type, and jB is the plywood of the type. Further, a certain figure shows a state in which a portion of the typeface 5A of the typeface S is typed toward the paper 30. In this way, the flexible paper 30 has a shape in which the printing part of the ribbon O (or P) digs in, creating a print width P or erase width P that is wider than the width T of the type 5A.
is obtained.

However, with such conventional printers,
Both printing and demagnetization are done using the same typeface S with the same embossing force on the I'11 octave, so the difference between the printed characters and the typeface 5 when demagnetized is the same. If there is a deviation in the printing position, the printing lIl? 3P and the erasing width P do not match, and the characters remain on the paper 3θ without being erased by the amount of the deviation.

That is, the character erasing function cannot be said to be sufficient, and there is a possibility that the printing quality will be degraded.

〔the purpose〕

SUMMARY OF THE INVENTION An object of the present invention is to address these conventional problems and provide a printer that has a sufficient character erasing function to eliminate unerased characters.

In order to achieve this object, the present invention forms a tapered surface on the side surface of the type that widens from the type surface toward the plywood, and also changes the output of the printing hammer driving means between when printing and when erasing characters. The printer is controlled to drive the printing machine with a stronger force than when printing when it disappears, so that an erasing width that is wider than the printing width of the printed characters on the paper can be obtained on the paper.

〔Example〕

The present invention will be described in detail below based on the drawings. 7th
The figure shows a typeface 3S used in the present invention. Note that the printed font 3S here corresponds to the printed font S in FIG. In the typeface 3S, the typeface 3 is placed on the typeface 33A.
A slope is formed from 5Q toward the base plate 3sB, and the side surface 33D of the type 35A is a tapered surface.

However, in the present invention, using such typeface 3S,
Printing and erasing are performed by the print hammer drive circuit described below. That is, FIG. 1 shows an example of a printing hammer drive circuit according to the present invention.

Here, F/ is a key for printing commands, and key 3 is a key for erasing commands, and G3 controls the printing hammer t to output a different drive output from the driver based on output signals from these keys/or screws. It is a control circuit. Further, yS is a power supply circuit that supplies dynamic power to the driver +X.

In this example, in the control circuit a, when the output signal from the erase command key is supplied, the print hammer is activated more easily than when the output signal from the print command key +/ is supplied. Even better driving 111. A control signal is supplied to the driver so that pressure is supplied. Therefore, when a character erasing command is given, the printing hammer can drive the type S07 with a larger printing pressure than when printing.

Therefore, the state in which implantation is performed according to each of these commands will be explained with reference to FIGS. 9(4) and 9(B). FIG. 9 (4) shows the printing state of the typeface 5 in the case of printing, where the paper 3θ is
Assuming that a print width of width P1 is obtained on the top, in the case of erasing, as mentioned above, the first embossing force is stronger than that in printing.
Since the type is supplied to the printing hammer L shown in the figure, the type S is driven toward the paper 3θ with a stronger force, and the flexible paper 3θ is pushed into the flexible paper 3θ as shown in FIG. 9(4). The recess is made deeper than in the case of , and an erasing width P2 wider than the printing width P1 is obtained on the paper 30.

Therefore, the printing l1gP is covered by the erasing width P2. For example, even if the printing of the type 50 is slightly shifted on the paper 3θ between printing and erasing due to some reason, the printed characters can be sufficiently erased. Can be erased.

In addition to this example in which the printed characters approach the printing paper, the present invention may be implemented in such a way that the printing hammer is operated from the back side of the printing paper to bring the printing paper closer to the printed characters.

〔effect〕

As explained above, according to the present invention, there is provided a printing hammer and a printing hammer driving means for driving the typeface toward the paper, and printing and typesetting are performed using the same typeface. In this apparatus, the type is formed to widen from the type surface toward the plywood, and on the other hand, a control means is provided for changing the output of the print/printer drive means between printing and erasing.
With this control means, when erasing, the printing mark is driven with a stronger force than when printing, so when erasing, the above-mentioned Taber-type type is printed on the paper with the erasing ribbon, which is stronger than when printing. It can be pressed into a wedge shape with pressure, and an erasing width wider than the printing width can be obtained on the paper, thereby providing a character erasing function that leaves no erased portions.

[Brief explanation of drawings]

Figure 1 shows 4:! of a conventional printer. Figure 2 is a perspective view of the cam member; Figures 3 (4), (B) and (0) show the cam part during standby, printing and erasing. 41st FXJ (A), (B), and (0) are diagrams showing the operating postures at the time of the printer standby. Diagrams showing the operating postures during printing and erasing, Fig. 5 is a perspective view schematically showing an example of the typeface, Fig. 6 is a sectional view showing the state of printing with the typeface, and Fig. 7 is the main character. FIG. 9 is a block diagram showing an example of the configuration of the printing hammer driving means in the printer of the invention; FIGS.
) is a cross-sectional view showing the state of printed characters during printing and erasing according to the present invention. /... Ink ribbon cassette, λ... Support shaft, 3... Platen, ≠... Printing hammer, j... Type, jA... Type, 5B... Base plate, 6... Ink ribbon 7... Holding bottle r... Cam part O A gk... B... hook on cam surface, ga... push-up surface W... cam shaft, /θ ...Return spring, /l...Ribbon solenoid, 〃...Arm plate) 21...Connection shaft, n...Lifter, Katana...(lζ Positive solenoid, 21...Ribbon spool, β...guide pulley, to...correction ribbon, 3θ...printing paper, 35...type, 35 A...type, B B...base plate, 330...type surface, 33 D...Taber surface, PI r P2 + T...Width, II/...Print command key, G2...Erase command key, G3...Control circuit, Item...Driver, RiS... ...Power supply circuit. Patent applicant Canon Co., Ltd. Fig. 1 23 11 Fig. 2 A Fig. 3 (A) 8A C Fig. 3 (B) Fig. 3 (C) ''' 8Δ Fig. 4 (A) Sn Figure 5A Figure 6 Figure 7 5C 35A 35D Figure 8 Figure 9 (A) 1

Claims (1)

[Claims] In a printer in which printing and erasing of printing are performed by bringing the printing type and printing paper close to each other with a printing hammer, the printing is formed in a Suehiro pattern with the printing surface facing the plywood, and when erasing the printing, A printer characterized in that the printed characters and the paper are brought close to each other using a large driving force.