JPS60120060A - Printer - Google Patents

Abstract

PURPOSE:To simplify a striking mechanism while eliminating fear of deterioration in material used therefor by varying the thickness of the bed to be striken by a plunger properly to each type to ensure a corresponding striking pressure with a uniform control in an impact printer using a petal-shaped type wheel. CONSTITUTION:In a type wheel 11, the thickness T in the striking direction of a plunger 6 concerning the bed 11B provided at the tip of a spoke 11A is varied with types and hence, the bed 11B has the thickness T varying according to the type area, namely, the area of the inscribed part of a type. The setting of the thickness T is done by controlling a striking force P of the plunger 6 to be almost in direct proportion to the stroke S. Therefore, the stroke S is kept shorter for the type of a smaller area permissible to a small striking force P by increasing the thickness T of the bed 11B while the stroke S is kept longer for the bed 11B having a type of a large area by reducing the thickness T thereof thereby making the stroke S correspond to each striking force P.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a printer, and more particularly to an impact printer having a petal-shaped type wheel and performing a printing operation via a striking mechanism.

[Prior art]

Conventional printers with this type of mechanism are configured so that the impact force is controlled depending on the size of the print area of the type placed on the type wheel. Printing was performed using a weak impact force, while large type characters with the same area were printed using a strong impact force.

Therefore, for such control, means have been used, such as changing the amount and time of energization to a magnet coil built into the striking mechanism, or changing it by using an elastic body, a buffer, or the like.

FIG. 1 shows an example of a printer using such a conventional petal type wheel, but here.

Only the parts related to the type wheel and the striking mechanism are shown, and illustrations of the carriage and other mechanisms are omitted. Here, 1 is a petal-shaped type wheel in which a type is provided at each tip of spokes/A arranged radially, and 1 is a motor for driving the type wheel.

Among the characters provided on the type wheel l, the next character to be printed is rotated to the opposite position on the printing paper q mounted on the platen 3 by the drive of the motor tacho. be done. S is an ink ribbon interposed between the printing paper DA and the type on the type wheel L.

6 is a plunger for striking, and the tip of the plunger is directed toward the rear side of the base/B where the letters ``spoke/A'' are provided. 7 is a magnet coil that causes the plunger 6 to perform a striking action, and the plunger 6 and coil 7 constitute a main striking mechanism,
When printing by impact is not performed, the plunger 6 and the printing spokes /A of the wheel l are in standby at positions 6' and /A', respectively, shown in FIG.

In a printer configured in this way, a printing table is stored in a storage means in a control electronic circuit (not shown)9, and the amount and time of energization for each character are read from the data in the printing table and the corresponding electricity is calculated. A signal is supplied to the coil 7 which causes the sibling 6 to respond.

That is, during printing, the plunger 6 is energized by the coil supplied with an electric signal, and the impact action of the plunger 6 as shown in Figure 1 moves the spoke /A that was in the standby position /A'. It is pushed out to the position shown by the dashed line, and the characters are struck onto the paper holder via the ink ribbon j.Thus, the amount of operation of the plunger base at this time is:
Therefore, the relationship obtained between the impact stroke S and the impact force P is changed in accordance with a preset rate of change in the amount of energization and the time of energization.

It can be controlled so that an appropriate printing pressure can be obtained for the printed characters.

However, in such a conventional impact printer, it is necessary to control the output to the coil 7 by including a storage means having a printing table for generating printing pressure, that is, impact pressure corresponding to the type side. Alternatively, in the case where the printing pressure is adjusted using an elastic body or a buffer body, there is a problem of deterioration of the material.

〔the purpose〕

The purpose of the present invention is to focus on the above-mentioned problems, and to reduce the thickness of the pedestal that is struck by the plunger during the printing operation.
By changing it appropriately for each type, the corresponding impact pressure can be obtained with regular control. To provide a printer having a petal type type wheel which is simple and free from the fear of deterioration of the material used for its striking mechanism.

〔Example〕

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

FIGS. 3 and 3 show an embodiment of the present invention.

Here, // is the type wheel and type wheel l/
As shown in Fig. 9, the thickness T of the plunger base in the travel direction of the base //B provided at the tip of the spoke //A varies depending on the type, and the type area, that is, the stamped part of the type. The pedestal//B has a different thickness T depending on the area.

As shown in FIG. 5, the setting of the thickness T is achieved by controlling the impact force P of the plunger base so that it is directly proportional to the stroke S of the pot 1.
Such control can be obtained very easily. Therefore, for type with a small type area that requires only a small impact force P, the stroke S can be kept short by increasing the thickness T of the pedestal //B, and the stroke S can be kept short by increasing the thickness T of the base//B. For the type pedestal //B with Bye.

Note that the other configurations are the same as in Figure 1, but
In this example, it is not necessary to control the amount of current supplied to the coil 7 and the duration of the current applied for each character.

However, it is only necessary to control the plunger AK to perform a constant operation such that the impact force P is directly proportional to the stroke S.

FIGS. 6 and 7 show examples of printing operations for characters having a small print area and for characters having a large print area, respectively. That is, FIG. 6 shows a case where the type area is small, and here, by forming the pedestal //B provided at the end of the spoke //A thick, the impact stroke S1 of the plunger base is shortened, and also, If the type area is large, the pedestal//B should be made thin as shown in Fig. 7, so that the impact stroke S can be reduced.
2 is longer than S.

Therefore, in order to obtain an impact force P that corresponds to the size of the typeface area, the thickness of the pedestal //B must be set so that the length of the impact stroke S corresponds to the size of the typeface area. Bye.

Although the above explanation deals with an impact printer having a petal type type wheel, the mechanism applied to the present invention is not limited to this type of printer, and the mechanism applied to the present invention is not limited to this type of printer. A mechanism is provided in which the distance is kept constant and a striking object is struck by a striking body projected from a striking generating device, and an impact force corresponding to the striking stroke of the striking body is applied to the striking subject. Needless to say, the invention is applicable not only to various printers that require it, but also to other general equipment that requires a similar mechanism.

〔effect〕

As described above, according to the present invention, the petal-shaped type wheel is provided with a type pedestal at each of the spoke ends, and the back surface of the type pedestal is struck by the impact stroke of the plunger to generate the impact pressure. In the case where printing is performed by υ, the thickness of each type base in the direction of the impact stroke is
By changing the stroke according to the type area of the type, the impact stroke of the plunger is almost directly proportional to the impact force, so the control circuit can be used to generate impact force for each type, unlike conventional methods. There is no need to provide a storage means with a printing table, so simple control is required, and since the impact pressure is not controlled using an elastic body or a buffer, there is no risk of functional deterioration due to deterioration of the impact pressure.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of the configuration of an impact printer using a conventional petal type type wheel, FIG. 2 is an explanatory diagram of its printing operation, and FIG. 3 is a perspective view showing an example of the configuration of the printer of the present invention. 5. Figure q is a perspective view showing an example of the configuration of the petal type type wheel. FIG. 5 is a characteristic curve diagram showing, as an example, the relationship between the impact force P generated by the printer of the present invention and the impact stroke S. FIGS. 6 and 7 are explanatory diagrams showing the printing operation of small type characters with a small type area and the printing operation of large type characters with a large type area, respectively, by the printer of the present invention. l...Type wheel, /A...Spoke. "/A', &'...position, 7B...type pedestal. λ...motor, 3...platen, q...paper, 5...ink ribbon. 6...plunger, R... Coil, l/... Type wheel, // A-... Spoke, // B... Pedestal, P... Impact pressure. S, S, , S2... Impact stroke. Figure 4 118

Claims (1)

[Claims] In a printer having a petal type type wheel in which type is arranged on each pedestal, and printing is performed by striking the pedestals, the thickness of each of the pedestals in the striking direction is defined as the thickness of the pedestals. 1. A printer characterized in that the printing pressure is adjusted according to the printing area of the printing type.