JPS6027661Y2 - wire dot printer - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a wire dot printer that is small and lightweight and has a high printing speed.

A conventional printer of this type is shown in FIG.

In FIG. 1, 25 is a plunger magnet section, which is separated from the plunger 31, the front magnetic pole 32, the rear magnetic pole 33, the yoke 34, and the coil 35.

Reference numeral 26 denotes a print head section, which includes a plurality of plunger magnet sections 25, a push rod 36, a wire 37, a pallet head 38, a return spring 39, a wire guide 40, and a plunger stopper 44.

41 is a platen, 42 is printing paper, and 43 is an ink ribbon.

When printing, a current is passed through the coil 35 to generate a magnet.

The raw magnetic flux circulates from the plunger 31 to the front magnetic pole 32 to the yoke 34 to the rear magnetic pole 33 to the plunger 31, and attracts the plunger 31 toward the front magnetic pole 32.

The sucked plunger 31 is moved by the push rod 3 provided at its tip.
6, the wire 37 is pressed against the platen 41, and dots are printed on a printing paper 42 placed between the wire 37 and the platen 41.

Characters are composed of multiple dots printed in a matrix.

In order to increase the printing speed of matrix characters, the tips of the plurality of wires 37 are concentrated in one vertical line, for example, in the vertical dimension of the character, and the plurality of wires 37 are simultaneously driven to print a plurality of dots at the same time. It is now possible to do so.

The wire 37 has an appropriate curvature to enable smooth sliding movement.

After printing the dots, the wire 37 and plunger 3
1 is returned by the restoring force of the return spring 39, and is pressed against the plunger stopper 44 and becomes stationary.

A printing paper 42 is placed between the tip of the wire 37 and the platen 41.
and a gap (
(hereinafter referred to as wire stroke) is provided.

This gap amount is closely related to printing speed, printing quality, and difficulty in inserting printing paper.

In order to increase the printing speed in this type of printer, the force with which the front magnetic pole 32 attracts the plunger 31 of the plunger magnet section (hereinafter referred to as attraction force) is increased, and the operating speed of the plunger 31 is increased. be.

There are two ways to increase the attractive force: increasing the product of the current flowing through the coil 35 and the number of turns of the coil 35 (hereinafter referred to as ampere turns), and increasing the gap between the plunger 31 and the front magnetic pole 32 (hereinafter referred to as the ampere turn). There is a method to reduce the amount (called a stroke).

Conventionally, in this type of printer, the wire 37 and the plunger 31 must slide a wire stroke amount in order for the wire 37 to collide with the platen 41 and print a dot.

Therefore, since the plunger stroke amount must be at least larger than the wire stroke amount, in order to increase the printing speed, it is necessary to rely on a method of increasing the ampere-turn value.

The first method to increase the ampere-turn value is to increase the current value flowing through the coil 35. However, increasing the current value increases the amount of heat generated from the coil 35 and shortens the life of the coil 35. However, the disadvantage is that the printing speed cannot be increased.

A second method is to increase the number of turns of the coil 35. However, increasing the number of turns of the coil 35 increases the size of the entire plunger magnet section 25. Therefore, in order to maintain an appropriate curvature of the wire 37, the length of the wire 37 must be In serial printers, etc., the print head section 26 becomes large due to the need to increase the length, making it difficult to feed the print head section 26 at a high speed corresponding to the number of digits printed in one line, making it impossible to increase the printing speed. There are drawbacks.

Further, if the length of the wire 37 becomes long, buckling occurs, resulting in a decrease in printing power.

Furthermore, as the number of turns of the coil 35 increases, the coil resistance also increases, so the load voltage must also be increased.

This invention is characterized by printing dots using the deflection recovery force of a cantilevered leaf spring, and its purpose is to increase the printing speed and to reduce the size and weight of the print head.
This will be explained in detail below.

FIG. 2 shows an embodiment of the present invention, in which 1 is a leaf spring assembly integrally formed with a plurality of leaf springs, each leaf spring is supported in the form of a cantilever, and the tip of the leaf spring is The plunger 3 is fixed to the midsection of the wire 2.

The plunger magnet section 15 includes a plunger 3, a front magnetic pole 4, a rear magnetic pole 5, a yoke 6, and a coil 7.

The print head section 16 includes a plate spring assembly 1 in which a plurality of plate springs are formed, a wire 2, a wire guide 8, a plunger magnet section 15, 9 a platen, 10 a printing paper,
11 is an ink ribbon.

When a print signal is input, a current flows through the coil 7, and the magnetic flux is generated.

The generated magnetic flux is the plunger 3 - front magnetic pole 4 - yoke 6 →
The flow is from the rear magnetic pole 5 to the plunger 3, and the front magnetic pole 4 attracts the plunger 3.

Since the plunger 3 is fixed to the leaf spring of the leaf spring assembly 1, when the plunger 3 is attracted, the leaf spring of the leaf spring assembly 1 is bent.

When the suction is finished, the current flowing through the coil 7 is stopped.

When the current stops flowing, the leaf spring of the leaf spring assembly 1 is released, the deflection is recovered by the natural frequency of the leaf spring of the leaf spring assembly 1, and the wire 2 fixed to the tip of the leaf spring 1 prints. Characters are formed by printing dots on printing paper 10 by pressing paper 10 and ink ribbon 11 against a platen, and are formed by printing a plurality of dots in a matrix.

FIG. 3 shows a print head section 16 capable of printing seven dots at the same time.

One of the features of the present invention is that the dots are printed using the restoring force of the leaf spring, and the plunger magnet section 15 only gives deflection to the leaf spring of the leaf spring assembly 1.
Does not require large suction power.

Another feature of the present invention is that the wire 2 is fixed to the tip of the leaf spring of the leaf spring assembly 1, and the plunger 3 is fixed to the midsection of the leaf spring, so that the gap (plunger stroke) between the plunger 3 and the front magnetic pole 4 is reduced. The length ratio (lever ratio) of the gap (wire stroke) between the wire 2 and the platen 9 shown in FIG. 2 a/
It can be reduced to b.

That is, the plunger stroker can be made smaller.

Another feature of this invention is that dot printing is performed using the recovery force when the deflection of the plate spring recovers, so by increasing the natural frequency of the plate spring, it is easy to increase the printing speed. .

Another feature of the present invention is that, as shown in FIG. 3, the tips of the leaf springs of the leaf spring assembly 1 can be concentrated.
The radius of curvature of the wire 2 can be increased, and therefore the length of the wire 2 can be made shorter than Euler's limit value for preventing the wire 2 from buckling, and the printing force can be reduced. No deterioration should occur.

Another feature of the present invention is that, as shown in Fig. 2, a plurality of cylindrical yokes 6 are integrated into the magnetic circuit formed together with each front magnetic pole, rear magnetic pole, and each plunger, instead of being provided individually. This is something that can be quantified.

Another feature of the present invention is that, as shown in FIG. The plate spring assembly 1 integrally formed from the periphery toward the center can be easily formed by etching or the like, and the wire 2 and plunger 3 can be easily fixed by tightening or brazing.

Another feature of the present invention is that the rear magnetic pole 5 can be integrated with a plurality of needles as shown in FIG.

The rear magnetic pole 5 is provided with a plunger hole f having an appropriate gap with the plunger 3.

As explained above, in the embodiment, dot printing is performed using the restoring force of the leaf springs of the leaf spring assembly 1, and the plunger magnet part 15 only provides deflection to the leaf springs of the leaf spring assembly 1. Since the plunger stroke can be reduced to the cantilever lever ratio (a/b) of the wire stroke, the plunger magnet portion 15 with a large suction force is not required.

Therefore, the plunger magnet section 15 can be made smaller and the length of the wire 2 can also be made shorter, so that the print head section 16 can be made smaller and lighter.

Further, by increasing the natural frequency of the leaf springs of the leaf spring assembly 1, there is an advantage that the printing speed can be easily increased.

Since this invention prints using the restoring force of the deflection of the leaf spring, it has the advantage of making the print head smaller and lighter and easily increasing the printing speed. It can be used as a terminal device for electronic computers.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional wire dot printer, Fig. 2 is an explanatory diagram of an embodiment of the present invention, Fig. 3 is a schematic plan view of the print head section of the present invention, and Fig. 4 is a rear view of the present invention. FIG. 3 is a schematic plan view of magnetic poles. 1...Plate spring assembly, 2...Wire,
3...Plunger, 4...Front magnetic pole,
5... Rear magnetic pole, 6... Yoke, 7...
...Coil, 8...Wire guide, 9...
...Platen, 10...Print paper, 11...
... Ink ribbon, 15 ... Plunger magnet section, 16 ... Print head section.

Claims (1)

[Scope of utility model registration request] A leaf spring assembly in which a plurality of cantilever leaf springs each having a free end at the tip and a fixed end at the other end are integrally formed from the peripheral edge toward the center with a common fixed end at the annular periphery. a body, each wire attached to the free end of each of the leaf springs, each plunger fixed to the midsection of each of the leaf springs on a side opposite to the attachment side of each of the wires, and a body opposite to each of the plungers. each of the front magnetic poles provided, a rear magnetic pole provided with a plurality of holes for passing each of the plungers provided between the leaf spring assembly and each of the front magnetic poles; and at least each of the front magnetic poles. Each coil is wound around a magnetic pole,
The plate spring assembly, the rear magnetic pole, each of the front magnetic poles, and a cylindrical yoke to which each of the coils are integrally attached, and a plunger that generates a magnetic field by energizing the coils through a printing part. After the plate spring is deflected by suctioning it in the opposite direction to the printing direction, the plunger is released to restore the deflection of the plate spring at its natural frequency, thereby causing the wire to move toward the platen side for printing. A wire dot printer featuring: