JPS6189062A - Printer - Google Patents

Abstract

PURPOSE:To hold a minimum carriage standstill time to the extent that no faulty printing action occurs and accelerate printing speed by arranging so that a time from the generation of a drive signal to a hammering means to the generation of a carriage moving signal in relation of a time for driving the hammering means. CONSTITUTION:A printing hammer 3 is actuated by exciting an electromagnetic coil 8, and a type 3A is hammered to paper 2 with a ribbon 4 by a springing force obtained at the time of actuation. If printing is done, a printing wheel 3 and a printing hammer 7 return to their original position by the repelling force of a platen 1 and the springing force of a spring 9. A carriage 13 on which a type hammer case 11 is mounted together with the type wheel 3 or a ribbon cassette 5 is connected to a timing belt 14. The time spent until the head of the hammer 7 finished hammering varies, but a carriage moving signal is generated at a time when the following printing action is not adversely affected so that the carriage 13 begins to be moved at each time when the hammering action is completed.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a printer, and more specifically, the present invention relates to a printer, and more specifically, a type wheel, a print knob, etc. are mounted on a carriage, and the type arranged on the type wheel is driven by a striking action of a printing hammer. It relates to a printer that prints.

[Prior art]

In conventional printers of this type, the type provided on the type wheel is driven onto the printing paper by a printing hammer via the ink ribbon, and the characters are printed. The type wheel is equipped with a wheel drive motor, an ink ribbon, etc., and the type wheel rotates while being moved to the next printing position by the carriage, and remains stationary relative to the platen that holds the paper during printing operations. After the printing is completed, it is rotated again to select the type to be printed next and is moved by the carriage.

In addition, since the optimal value for the impact pressure on the type produced by the printing knob differs depending on the size of the type area, a table of impact pressure corresponding to the type area is generally provided, and the look amplifier of this table is used to determine the optimal value for each type. i! controls so that the striking pressure is obtained. 4 tJ2. In addition,
In order to obtain this kind of impact pressure, since the mass of the hammer is constant, the impact force that drives the hammer toward the wheel can be changed by changing the current applied to the magnet coil, etc. so that the speed of the hammer can be changed. It was common practice to control the

However, in such conventional printers,
In the series of printing operations described above, after one printing operation is completed, a movement start signal for moving the carriage is output after a certain sufficient period of rest. It is necessary to shorten the time as much as possible.

〔the purpose〕

The purpose of the present invention is to solve such problems,
To provide a printer in which a carriage movement start time is set in accordance with the impact pressure table of a printing hammer, and by setting the movement start time in this manner, the carriage rest time is shortened and printing speed is increased. There is a particular thing.

〔Example〕

Embodiments of the present invention will be described in detail below based on the drawings.

1 and 2 show one embodiment of the invention.

Here, only the parts directly involved in the printing operation, such as the carriage and platen, are shown, but 1 is the platen, 2 is the printing paper held by the platen 1, and 3 is the type with type 3A arranged at the tip of the radial arm. The ink ribbon 4, which is a wheel and is interposed between the paper 2 and the type 3A, is supplied from an ink ribbon cassette 5.

Furthermore, 6 is a motor that rotates the type wheel 3, 7 is a print hammer that drives the type 3A toward the paper 3 via the revolving ribbon/4, and 8 is a magnetic coil that holds the print hammer 7. . Thus, by excitation of the magnet coil 8, the printing hammer 7 can be caused to perform a striking operation. 9 is the printing hammer return spring, 10 is the printing knob 7
An elastic shock absorber 11 holds the coil 8, spring 9, and shock absorber 10 in the return position.The hammer case 11 is attached to the carriage 13 by screws 12. A carriage 13 loaded with a type wheel 3, a ribbon cassette 5, and a type letter case 11 is connected to a timing belt 14, and is moved in a direction parallel to the platen 1 by a carriage drive motor 15. 16 is a guide shaft of the carriage 13.

In the printer configured in this way, the electromagnetic coil 8
By energizing the printing knob 3, the printing knob 3 is energized.
The dynamic force obtained at that time drives the type 3A together with the ribbon 4 toward the paper 2, and when printing is completed, the repulsive force of the platen 1 and the spring force of the barb 9 cause the type wheel 3 to
and printing...knob 3 returns to its original position.

FIG. 3 shows the relationship between the driving operation and return operation of the print knob 7 and the timing at which the carriage movement 8 start signal and the wheel rotation start signal are generated in the printer of the present invention, and the right half of FIG. For the sake of easy explanation, this is in relation to the position shown in FIG.

That is, the vertical lines P1°P2. in the right half of FIG.
and P4 represent the surface of the platen 1, the final impression position of the type 3A, and the tip position of the printing hammer 7, and therefore the distance between the lines P1 and P2 is the paper 2. This corresponds to the total dimension of the wheel thickness of the ribbon 4 and the type 3A portion.

Furthermore, in the left half of FIG. 3, the time just before the magnet coil 8 is excited is set as the horizontal axis where 1=0, and the horizontal axis is ? The timings at which the IL magnetic coil 8 magnetic signal, carriage movement signal, and wheel rotation signal are generated are shown in accordance with the printing hammer operation curve on the right side of FIG. 3.

Therefore, here, there are two cases: a case where the magnet excitation signal A1 that causes the hammer 7 to generate a large impact force is outputted, and a case where the magnet excitation signal B1 that causes the hammer 7 to generate a small impact force is output. Displayed the street.

That is, when the excitation signal A1 is output, the knob 7
The tip moves along the trajectory shown by curve A, and the excitation signal B
When 1 is output, the tip moves along a trajectory as shown by curve B.

As is clear from these trajectories A and B, the time until the tip of the hammer 7 finishes striking is T.
A and TB are different, but K is set so that the carriage 13 starts to move at each point in time when these impacts are completed.
However, there is no problem in the next printing operation. Therefore, in the present invention, the carriage movement signals Ac and BC are generated at these times.

Note that this example shows a case where two types of impact force can be obtained, but it goes without saying that settings can be made so that several types of impact force can be obtained depending on the size of the typeface area. In such a case, the carriage movement signal generation timing may be set in the same manner.

Next, referring to FIG. 4, a control means for realizing the above-mentioned operation timing for the printing hammer and carriage will be described.

In FIG. 4, target print information 1 inputted from a key board (not shown) or the like and converted into a parallel signal is read into the memory of the printer control CPU 22, and then once transferred to the print wheel 3 using a print-target position conversion table 23. is converted to the target position. Next, the CPU 22 refers to the blood on the printing pressure table 24 corresponding to the target position of the type character, and at the same time controls the type wheel 3 and the carriage 13 to advance to the target position using servo logic not written here.

Then, upon confirming that the type wheel 3 and carriage have reached the target position, the CPU 22 activates the timer 31 in the program timer module (PTM) 5, which selects the print hammer excitation time corresponding to the reference value from the print pressure table 1. On the other hand, a value proportional to the printing hammer excitation time is written and activated. (Fixed timer 31 in PTM25
, 32. ...°, the clock signal C from the CPU 22
When the values written sequentially according to LK are subtracted and become zero,
It functions to generate an interrupt signal to the CPU 22.

On the other hand, from the value referenced from the printing pressure table, CPU 2
2 refers to the corresponding period in the waiting time table 6 and starts the timer 32 almost simultaneously with the timer 31.

The value written to the timer 32 at this time is set in such a manner that the value written to the timer 1 is N.

Here, k and m are constants determined by the performance of the printing knob 7. The output HMRE of the output boat 27 changes to "ON" as soon as the carrier 3 and type wheel 13 reach the target position, so the output H of the OR gate 8 changes to "ON".
MR (print hammer drive signal, that is, magnet excitation signal Ai + Bi...) is the output time T1 of the timer 31
During this period, the printer is in an active state and the printing knob 7 is driven.

On the other hand, the timer 32, which was activated almost simultaneously with the timer 1, becomes zero after the elapse of time and interrupts the CPU 22. In response to this interrupt from timer 32, the CPU
22 turns on the carriage motor drive signal in the output port 27 and starts control to move the carriage I3 to the next printing target position. Therefore, the start of operation of the carriage motor 13 is caused by the electromagnetic motor driving the printing hammer 7. When the excitation time of the coil 8 is long, it becomes faster, and when the excitation time is small, it becomes slower, and the time is always set at the time when the hammer 7 finishes striking, so there is no wasted carriage rest time, and time efficiency is improved. A high-quality printer can be realized.

〔effect〕

As explained above, according to the present invention, there is provided a carriage on which a type carrier is mounted, and printing is performed by moving the selected type from the type carrier by the striking means with a force corresponding to the area of the type. In the printer, since the time from the generation of the drive signal to the impacting means to the time of generation of the ca. The minimum carriage resting time can be maintained within a limit that does not cause any damage, and printing speed can be increased.

It goes without saying that the application of the present invention is not limited to this type of printer, but can be applied to a wide range of printers in which printing is performed by moving a carriage.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an overview of the carriage drive section and platen of the printer of the present invention, Fig. 2 is a model diagram showing the relative position of each member in the printing section of the printer of the invention, and Fig. 3 is a printing of the printer of the invention. FIG. 4 is an explanatory diagram showing a relative relationship between the operation locus of the tip of the printing hammer and the output timing of the hammer drive electromagnetic filter drive signal, carriage movement signal, and wheel rotation signal. It is a control block diagram. 1. Platen, 2. Paper, 3. Type wheel, 3A. Type, 4. Ink ribbon, 5. Ribbon cassette, 6. Motor, 7. Printing hammer, 8. ... Electromagnetic coil, 9 ... Spring, 10 ... Buffer, 11 ... Hammer case, 12 ... Screw, 13 ... Carriage, 14 ... Timing belt, 15 ... Drive motor, 16... Guide shaft, Ac, Be... Carriage movement signal, Aw
, Bw...Print wheel rotation signal, Ai,
Bi: Magnet excitation signal.

Claims (1)

[Scope of Claims] 1) A type supporter supporting a plurality of type characters, a type selection device that operates the type supporter to guide a type selected from the plurality of type characters to a printing position, and the type selection device. means for supplying a striking signal to a striking device that moves the type selected by the device toward a recording sheet; and a carriage movement signal that moves a carriage carrying the type carrier, the type selection device, and the striking device. In the printer, the time from the time when the impact signal is generated to the time when the carriage movement signal is generated is changed in relation to the individual print area of the plurality of print characters. A printer featuring 2) In the printer according to claim 1,
The time from the time when the impact signal is generated to the time when the carriage movement signal is generated is a time set based on the generation period of the impact signal that is set in relation to the individual type area. Featured printers.