JPS6235869A - Printer with deleting function - Google Patents

Abstract

PURPOSE:To provide printer having the deleting function for positively deleting a character printed on a printing paper with a simple construction, by a method wherein a printing head is reciprocated across a character to be deleted, and overprinting by driving all printing wires is performed through a deletion ribbon each time the head is moved across the character to be deleted. CONSTITUTION:When the printing head 5 reaches a position P5, a carriage 3 is stopped at such a position that the wires of the head 5 reach a position P6. Energizing of a correction solenoid 6c is stopped, a printing ribbon 7a is located at a position facing the head 5, a forward deleting operation is completed, and control is transferred into a deleting processing. At the position P6, backward movement accompanied by acceleration of the carriage 3 is started, the carriage 3 is moved backward from the position P5 to a position P4 with the acceleration, and a deleting operation is carried out. The carriage 3 is moved backward at a fixed velocity from the position P4 to a position P3, and a deleting operation for the character C2 to be deleted is performed. Further, the carriage 3 is moved backward with deceleration from position P3 to position P2 and from position P2 to position P1, and a deleting operation is conducted.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention [Field of Industrial Application] The present invention relates to a printing device having a character erasing function for erasing characters, symbols @, etc. printed by a dot impact type print head.

[Prior Art] For example, a printing device has a printer that stores printed characters over one line or several lines of printing paper in a buffer memory as printed character data, and allows an operator to erase within the range of the stored printed character data. By selecting the commanded character, moving the print head to the position of the character to be erased, and driving the wire of the print head in a dot pattern corresponding to the character to be erased, the character is erased via the erase ribbon. He was practicing urajin.

[Problems to be Solved by the Invention] The conventional printing device having a character erasing function has the following problems. In other words, (1) Since the buffer memory capacity for storing printed character data is limited, the printed characters that can be erased are limited to one or several lines on the printing paper. There was a problem.

Note that when attempting to erase characters other than those stored in the buffer memory, a special operation is required, which may reduce the efficiency of printing operations.

(2) In addition, in order to realize the character erasing function, a dedicated buffer 7 memory and its peripheral circuit elements as mentioned above are required, leading to an increase in the number of parts of the device and the problem of high manufacturing costs. there were.

(3) Furthermore, since the erasing operation is performed by driving the print wires corresponding to the characters 1 to 1 of the patterns stored in the buffer memory, when performing the erasing operation, the print head is moved to the character to be erased. It is necessary to position accurately. For this reason, there is a problem in that the position detector of the print head and the drive mechanism of the print head are required to have high precision, making the device configuration complicated. A similar problem can also occur when attempting to erase characters located in the previous printing line by rotating the platen and returning the paper, and the reliability of the erasing operation in such cases is significantly reduced. There was also a problem.

SUMMARY OF THE INVENTION The present invention aims to solve each of the above-mentioned problems and to provide a printing device having a character erasing function for reliably erasing characters on printing paper with a simple configuration.

Structure of the Invention [Means for Solving the Problems] In order to solve the above problems, the present invention has the following structure. That is, as shown in FIG.
A platen M1 that supports a printing paper, and a driver 1 to an impact-type printing head M2 that has a plurality of printing wires and prints characters on the printing paper via a printing ribbon or erases characters via an erasing ribbon. In a printing device having a character erasing function, according to an erasing command for characters printed on the printing paper,
The print head M is moved over the characters to be erased multiple times.
2 is moved back and forth, and when the print head M2 passes over the character to be erased, erasing means M3 is provided for driving the printing wire and erasing the character to be erased via the erasing ribbon.

[Function] The printing device having the character erasing function of the present invention has the erasing means M
3 causes a print head M2 having a plurality of print wires to reciprocate across the characters to be erased, and connects the print wires through an erase ribbon when the print head M2 passes over the characters to be erased. It operates to erase the characters to be erased.

Therefore, the wire of the print head M2 serves to erase the characters by overstriking the characters to be erased through the erasing ribbon in a reciprocating motion.

[Example] Next, a first example of the present invention will be described in detail based on the drawings.

In the printing device 1 according to the first embodiment of the present invention, as shown in FIG. 2, a platen 2 is rotatably supported between left and right frames 1a and 1'b. The platen 2 has printing paper 2a
The printing paper 2a is fed or returned in a direction perpendicular to its width direction according to the rotational drive of the paper feed motor 2b.

Between the outside/right frame 1a and lb is the platen 2.
A guide shaft 3a and a guide bar 3b are installed parallel to the guide shaft 3a and the guide bar 3b. The carriage 3 is slidably mounted on the guide shaft 3a and guide bar 3b, and is reciprocated in the directions indicated by arrows A and B in the figure using a carriage drive motor 4 as a drive source. Hereinafter, the case in which the carriage 3 moves in the direction shown by arrow A will be referred to as forward movement, and the case in which the carriage 3 moves in the direction shown in arrow B will be referred to as backward movement. The carriage drive motor 4 is a stepping motor that rotates by a predetermined angle when receiving a stepping pulse, and also causes the carriage 3 to reciprocate via a toothed belt 4a. Therefore, although the printing points are not completely the same in the forward and backward movements, the positioning accuracy of the carriage 3 is extremely high, and printing in both directions has almost no effect on the printing quality. The backlash of the gear causes a positional deviation of less than half a printing point.

The carriage 3 includes a wire dot type print head 5.
is disposed so as to closely face the platen 2 described above. Further, a flexible cable 5a is connected to the carriage 3 for supplying a drive current to the print head 5.

The ribbon 7 pulled out from the ribbon cartridge 6 is connected to a right ribbon guide 6a, a print head 5 and a left ribbon guide 6.
The ribbon is then housed in the ribbon cartridge 6 again via b. The ribbon 7 is transported in the above-mentioned direction by the ribbon transport mechanism 8 as the carriage 3 moves forward. For details of the ribbon transport mechanism 8, please refer to Utility Model Application No. 12629/1983 filed by the applicant of the present invention. This ribbon 7
is made of a synthetic resin tape such as a polyester film, and as shown in FIG. 3, has an upper half printing ribbon 7a coated with carbon powder and a lower half erasing ribbon 7b coated with adhesive. It is composed of. The printing ribbon 7a and the erasing ribbon 7b are moved up and down by a ribbon lift FAfS, which will be described later, so that either the printing ribbon 7a or the erasing ribbon 7b selectively faces the printing head 5.

The ribbon lift mechanism includes a collection solenoid 6C1, a ribbon bar lifter 6d operatively connected to the collection solenoid 6c, and a base of which is rotatably supported by the guide bar 3b; A ribbon lifter 5e that is rotated and operatively connects the left and right ribbon guides 6a and 6b, and a pair of ribbon lifters that are vertically movable on the carriage 3 and that guide the ribbon 7 to the print head 5. The ribbon feeding holder 6f is composed of a ribbon feeding holder 6f, and a holder pressing spring 6g that urges the ribbon feeding holder 6f downward. If the collection solenoid 6C is not energized, the ribbon feed holder 6
Since the left and right ribbon guides 6a and 6b are located below, the print head 5 and the print ribbon 7a are opposed to each other.

On the other hand, when the collection solenoid 6c is energized, it passes through the ribbon bar lifter 6d, ribbon lift par 60 to the left and right ribbon guides 6a, 6b and the ribbon feed holder 6f.
is pushed upward against the bias of the holder pressing spring 6g, so that the erasing ribbon 7b faces the print head 5.

The correction solenoid 6c and carriage drive motor 4 described above are connected to the keyboard 9. Font ROMl
It is connected to the electronic control device 20 along with the 0 and the like. The electronic control unit 20 operates by receiving power from the power source 11, and prints on the printing paper 2a in a dot matrix format according to the data input by operating the keyboard 9 described above. Erase characters or codes.

As shown in FIG. 4, the electronic control device 20 includes a CPU 20a that controls each of the mechanisms described above according to a control program to perform printing or erasing operations, and a ROM 2 in which the control program and initial data are stored in advance.
0b, and a RAM 20c in which data input to the electronic control unit 20 is stored. It is configured to perform input/output to each external 1ih'4.

The electronic control device 20 includes a key scan control circuit 2Of that detects a pressed key among the keys arranged on the keyboard 9 according to a mode set by the operator.

Input data from the keyboard 9 and data stored in the font ROM 10 are input via the input/output port 20d and read by the CPU 20a. on the other hand,
The already mentioned paper feed motor 2b.

Carriage drive motor 4. Print head 5. Drive circuit 20 that supplies drive current to each collection solenoid 6C
i, 20j, 20, and 20m are output boats 20e, respectively.
It is controlled by the CPU 20a via the CPU 20a.

The erasing process executed by the electronic control unit 20 will be described below with reference to FIGS. 5 and 6(A).

31 will be explained based on the flowchart 1 shown in (B).

As shown in FIG. 5, the erasing process consists of a forward erasing process (step 100) and a backward erasing process (step 200). When the key indicating the position of the character to be erased is operated, step 100.2 above is executed.
00 is executed sequentially to complete erasing of characters.

First, the details of the forward movement erasing process in step 100 will be explained based on the flowchart 1~ of FIG. As a result, the erasing ribbon 7b is placed at a position facing the print head 5.

In the following step 110, the kittridge 3 is moved until the position 1p1 near the character to be erased faces the ears of the print head 5, and then stopped. In this embodiment, it is assumed that each character is printed in a 9x7 dot matrix format, and the interval between each character is 3 dots.

Next, in step 115, processing for starting the through-up forward movement of the carriage 3 is performed. That is, the carriage 3 stopped at the position P1 starts to move forward with acceleration in the direction shown by arrow A in FIG. This acceleration is performed by gradually shortening the interval of pulse signals for excitation that are output to the Kittredge drive motor 4, which is a stepping motor. In the following step 120, Ki(1
Based on the change in the pulse signal output to the rigid drive motor 4, it is determined whether or not there is a printing timing corresponding to the timing at which the excitation phase is switched. If the excitation phase is switched, the process proceeds to step 125. Note that since the carriage 3 started forward movement from position P1 shown in FIG.
25, the wire of the print head 5 has reached a position opposite to position P2 shown in FIG. In step 125, all print wires of the print head 5 are driven. That is, the erasing operation is started for the position on the printing paper 2a corresponding to the position P2. Next, in step 130, it is determined whether the wire of the print head 5 has reached position P3 shown in FIG. As shown in the figure, position P3 is a position opposite to the leftmost dot row D1 of the character C2 to be erased. Print head 5
When the carriage 3 reaches the position P3, the process proceeds to step 135, and the constant speed forward movement of the carriage 3 is started. This forward motion at a constant speed is executed by outputting a pulse signal for exciting the carriage drive motor 4 at constant intervals. In the following step 140, the presence or absence of the printing timing described above is determined, and when the printing timing has arrived,
Proceeding to step 145, all wires of the print head 5 are driven to perform an erase operation. Next step 15
0, it is determined whether or not the wires of the print head 5 have reached the position P4 shown in FIG. As shown in the figure, position P4 is a position opposite to the rightmost dot row D7 of the character C2 to be erased.

In step 155, which is executed when the print head 5 reaches position P4, through-down forward movement processing of the carriage 3 is performed. In other words, forward movement accompanied by deceleration is performed. This is performed by gradually increasing the interval between pulse signals that excite the carriage drive motor 4.

In the following step 160, the presence or absence of printing timing is determined, and when the printing timing is reached, step 1 is executed.
The process advances to step 65, where a process of driving all the wires of the print head 5 to perform an erasing operation is executed. Next step 170
Then, it is determined whether the wire of the print head 5 has reached a position opposite to the position P5 shown in FIG. The position P
5 is a position two dots before the character C3 to the right of the character C2 to be erased.

If the print head 5 reaches position P5, step 17
5, the carriage 3 is stopped at a position where the wire of the print head 5 reaches position P6 shown in FIG. As shown in the figure, position P6 is the position of the rightmost dot of the dots forming the distance from the character C3 on the right.

After stopping at position P6, the process proceeds to step 180, in which the collection solenoid 6C is de-energized and the printing ribbon 7
a is placed at a position facing the print head 5, the forward erasing process is completed, and control shifts to the erasing process.

Next, in the erasing process, the forward erasing process 100 described above is performed.
The details of the backward erasing process 200 that is performed subsequently will be explained based on the flowchart shown in FIG. 6(B).

In the backward movement erasing process 200, the carriage 3 is moved backward from the position P6 to the position P1, and the same processes as the forward movement erasing process described above are performed, so only the operations will be explained briefly. First, the carriage 3 starts to move back with acceleration from position P6 shown in FIG. 230). Next, position P4
The carriage 3 is moved backwards at a constant speed from to position P3, and the erasing operation for the character C2 to be erased is performed (
Steps 235-250). Furthermore, from position P3 to position P
2, the carriage 3 is moved back with deceleration and the erase operation is executed (steps 255 to 270).
. Finally, the carriage 3 moves backward with deceleration from position P2 to position P1, stops at position P, and the erasing ribbon 7b is returned to its original position by the ribbon lift mechanism (steps 275 to 280). .

When the backward erasing process (step 200) is executed following the forward erasing process (step 100) described above, the erasing process can proceed to NEXT and end.

The first embodiment configured as described above performs the erasing operation over a wide range including the through-up area and the through-down area in addition to the area of the character C2 that is erased when performing the erasing operation. Therefore, it is not necessary to position the carriage 3 with high accuracy with respect to the character C2 to be erased, and the erasing operation can be suitably performed with a simple equipment configuration, and the wastage of erasing operation time and power consumption can be prevented. It becomes possible.

In addition, since there is no need for a buffer 7 memory dedicated to the erasing function, the number of parts can be reduced, and all characters printed on the printing paper 2a can be erased. Benefits also arise.

Roughly speaking, when the carriage 3 is moved forward and when it is moved backwards, even if the wire of the print head 5 is driven based on the same print timing signal to perform the erasing operation, the drive mechanism of the carriage 3 will be affected. Due to existing backlash, etc., the wire may be slightly misaligned. Therefore, during the erasing operation performed during the reciprocating movement, the wire strikes each dot over and over again through the erasing ribbon 7b for the dots to patterns constituting the character C2 to be erased. Since the erasing operation is performed at a high impact density over the range including the driver 1 pattern, the erasing operation can be performed reliably in a short time.

Next, a second embodiment of the present invention will be described. Since the device configuration of the second embodiment is exactly the same as that of the first embodiment, each part of the device will be denoted by the same reference numeral and a description thereof will be omitted. The second example is
A feature of the present invention is that when the wire is driven to perform an erasing operation, the striking position of the wire is relatively shifted by half a dot due to the reciprocating movement of the carriage 3. Hereinafter, the erasing process executed in the second embodiment of the present invention will be explained based on the flowchart of FIG.

In the erasing process of the second embodiment, first, the forward erasing process (step 100) described in the first embodiment is executed, followed by the backward erasing process (steps 405 to 480) shown in FIG.
) is executed.

The details of this double action erasing process will be explained based on the flowchart shown in FIG. It should be noted that steps for executing processing similar to the backward erasing processing of the first embodiment described above are indicated by the same numbers in the lower 21 lines, and the explanation thereof will be omitted. Second
The backward movement erasing process of this embodiment is similar to the backward movement erasing process of the first embodiment described above, and includes a process of performing a backward movement accompanied by acceleration of the carriage 3 and also executing an erasing operation (steps 405 to 4).
30), a process of performing a constant speed backward movement of the carriage 3 and performing an erasing operation (steps 435 to 450), and a process of performing a backward movement accompanied by deceleration of the carriage 3 and performing an erasing operation (steps 455 to 480) It is composed of: During each of these processes, a process for determining the presence or absence of print timing (steps 420, 440, 460>
After that, the delay port waits until a preset delay time elapses, and the inter-processing (steps 422, 442, 462)
> is newly provided, and after the delay time has elapsed, erasing processing (steps 425, 445, 465) for driving the wire is performed. Note that this delay time is
Based on the moving speed of the carriage 3, this is set as the time required for the carriage 3 to arrive at a position that is half a dot away from a predetermined printing position. In this way, in the backward erasing process, by hitting the wire at a position that is half a dot away from the forward erasing process, the wire is struck at a position that is half a dot away from the forward erasing process. An erase operation can be performed on the data.

When the backward erasing process is completed, it is possible to proceed to NEXT and the main erasing process ends.

As explained above, in the second embodiment, when performing an erasing operation, the wire of the print head 5 is struck at a position relatively half a dot away from the carriage 3 when it moves forward and when it moves back. It is composed of

Therefore, in addition to the effects of the first embodiment described above, the following effects are achieved. In other words, for one dot of the dot pattern constituting the character to be erased, the erasing ribbon 7b
The wire of the print head 5 passes through the page in the direction of movement of the carriage 3 to perform erasing strikes at a plurality of locations, ensuring high striking density.

Next, a third embodiment of the present invention will be described. Since the device configuration of the third embodiment is exactly the same as that of the first embodiment, each part of the device is denoted by the same reference numeral and the explanation thereof will be omitted. The third example is
The printing paper 2a is characterized in that the erasing operation is performed by moving the printing paper 2a in the paper feed direction and paper return direction by a distance corresponding to a half dot, respectively. Hereinafter, the line feed erasing process executed in the third embodiment of the present invention will be explained based on the flowchart shown in FIG.

As shown in FIG. 9, the line feed erasing process starts at step 500 according to the operator's instructions. first,
In step 500, the platen 2 is rotated and the printing paper 2a is line fed in the paper return direction by a distance corresponding to half a dot. In the following step 550, forward erase processing is performed. The content of this process is similar to the forward motion elimination process (step 100) described in the first embodiment, in which acceleration forward motion elimination, constant speed forward motion elimination, and deceleration forward motion elimination processing are performed. Next, the process proceeds to step 600, where the platen 2 is rotated and the printing paper 2a is line-fed in the paper feeding direction by a distance corresponding to half a dot. In the following step 650, backward erasing processing is performed. The content of this process is the same as the backward movement erasing process (step 200) described in the first embodiment, such as accelerated backward movement erasing,
Each process of constant speed backward motion elimination and deceleration backward motion elimination is performed.

Next, proceed to step 700, rotate the platen 2,
A process is performed in which the printing paper 2a is line fed in the paper feeding direction by a distance corresponding to half a dot. In the following step 750, the forward erase process similar to that in step 550 is performed, and the process can be proceeded to NEXT, thereby terminating the present process.

As explained above, in the third embodiment, when performing an erasing operation, the printing paper 2a is fed by a distance corresponding to half a dot each time the aforementioned forward erasing process or backward erasing process is performed. It is configured to perform line feeding processing in the paper return direction or the paper return direction. Therefore, in addition to the effects of the first embodiment described above, the following effects are achieved. In other words, for each dot pattern constituting the character to be erased, the wire of the print head 5 is moved through the erasing ribbon 7b in both the moving direction of the carriage 3 and the paper feeding direction of the printing paper 2a. Since the characters are struck for erasing at a plurality of locations, characters can be reliably erased with extremely high striking density.

In addition, since the erasing target is a range expanded by half a dot in both the paper feed direction and the paper return direction relative to the character to be erased, when performing the erasing operation, the area in which the carriage 3 moves is It becomes possible to reduce restrictions regarding positioning accuracy in the line feed direction, which is relatively difficult.

Furthermore, since the key A ridge 3 performs the forward erasing process again after one reciprocating movement, if characters adjacent to the right side of the character that was erased this time are to be erased in succession, it can be quickly erased. There also arises the advantage that an erase operation can be performed.

Several embodiments of the present invention have been described above, but
The present invention is in no way limited to these embodiments. For example, each time the erasing process that is performed in the second embodiment and causes a relative positional shift of half a dot between the forward movement port 4 and the backward movement of the carriage 3 is executed, the erase process is performed in the third embodiment. The printing paper 2a is configured to line-feed the printing paper 2a by a distance corresponding to half a dot in the paper feeding direction or the paper returning direction. In this way, already)
Of course, each of the above embodiments can be implemented in various ways without departing from the gist of the present invention.

Effects of the Invention As detailed above, the printing device having the character erasing operation of the present invention has a printing device in which the print head reciprocates across the character to be erased, and every time the print head moves across the character, all the printing wires are driven through the erasing ribbon. Since small strokes are performed, it is possible to perform the erasing operation with a high impact density on the dot pattern constituting the character to be erased, and the reliability of the character erasing operation is improved, which is an excellent effect.

Further, since the position of the character to be erased is not subject to restrictions such as η caused by the buffer memory capacity, all characters printed on the printing paper can be erased.

Furthermore, there is an advantage that a dedicated buffer 7 memory and other peripheral circuits are not required to perform the erase operation, and the number of C1 components can be reduced and manufacturing costs can also be reduced.

Further, when performing an erasing operation, since accurate positioning of the print head is not required, reliable character erasing can be performed with a simple device configuration.

[Brief explanation of the drawing]

Fig. 1 is a basic configuration diagram conceptually illustrating the content of the present invention, Fig. 2 is a schematic configuration diagram of a printing device which is the first embodiment of the invention, and Fig. 3 also focuses on its ribbon lift mechanism. FIG. 4 is a block diagram for explaining the configuration of the electronic control device, and FIG. 5 is a flowchart p-t-1 of the erasing process executed by the electronic control device in the first embodiment of the present invention. Figure 6 (A> is a flowchart showing the details of the forward erasing process, Figure 6 (B) is a flowchart showing the details of the backward erasing process, and Figure 7 is a flowchart showing the details of the forward erasing process. Figure 7 shows the position and erasure of characters to be erased. An explanatory diagram for explaining the relationship with the position of the print head during operation, FIG. 8 is a flowchart showing details of the backward erasing process executed by the electronic control unit in the second embodiment of the present invention, and FIG. It is a flowchart showing the line feed erasing process executed by the electronic control unit in the third embodiment of the present invention. 1... Printing device 2... Platen 5...
Print head 20...electronic control device 20a
・CPU

Claims (1)

[Scope of Claims] 1. A dot impact type having a platen that supports printing paper and a plurality of printing wires, and printing characters on the printing paper via a printing ribbon or erasing characters via an erasing ribbon. In a printing device having a character erasing function, which is equipped with a print head and a character erasing function, according to an erasing command for the printed characters on the printing paper,
reciprocating the print head to traverse the character to be erased multiple times, and as the print head passes over the character to be erased, driving the print wire through the erase ribbon to cause the erase to occur; A printing device having a character erasing function, characterized in that it is equipped with an erasing means for erasing characters.