JPH0211337A - Needle printer - Google Patents

Abstract

PURPOSE: To simplify the constitution of an elastically deformable conductor element to clamp the same as an individual conductor and providing a printing needle at the max. displacing place of the conductor element. CONSTITUTION: A drawing is an oblique view of two permanent magnets 10, 11 forming a magnetic field 12 between poles and three bracket-shaped freely elastically deformable conductor elements are positioned within the magnetic field formed by these magnets and the respective one end parts of these conductor elements are clamped to the place shown by a numeral 14 and printing needles 15 are provided to the respective free ends of the conductor elements. When a current is supplied to the bracket-shaped conductor elements 13 through a transformer 16, these conductor elements are elastically deplaced immediately in the direction shown by an arrow 17 and, therefore, the printing needles 15 are moved in the direction of a printing drum (not shown in a drawing).

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a two-dollar printer that utilizes the force exerted on a conductor in a magnetic field to cause current to flow through the conductor to differentially move a printing needle.

[Conventional technology]

This type of needle printer is described, for example, in West German patent application no.
It is known from No. 406132. This conventional construction comprises an impact device for dot printers with a dynamic coil, which is rigidly connected to the print hammer and which is subjected to the action of at least one magnetic field approximately perpendicular to its plane, and which also has an elastic It is connected to the fixed holder by a suspension part that can be deformed into a shape. The dynamic coil consists of at least one helix cut out of a thin metal foil, and the elastic suspension consists of small metal strips, which are coplanar with each other and with respect to said helix. That's what I do. A helix cut from metal foil is connected to a non-magnetic side plate, and via a small metal strip a percussion device, which can rotate around a fixed axis, is firmly connected to a printing hammer, which can cooperate with an anvil.

[Problem to be solved by the invention]

The conventional structure described above is complex in structure and has a large number of movable parts.

The object of the invention is to simplify the construction of a needle printer of the type mentioned at the outset.

[Means to solve the problem]

In order to achieve the above object, the present invention provides at least one elastically deformable conductor element, each of these conductor elements is clamped as an individual conductor, and the point of maximum displacement of each conductor element is It is characterized by the provision of a printing needle.

With such a configuration, the mass of the movable part is reduced, and therefore the printing speed can be increased.

Since the configuration is simple, it is less susceptible to interference.

Since each conductive element is elastically deformable, a specific return spring is not required. The printing stylus is provided at a location where the elastically deformable conductor element is maximally displaced when a current is passed through the conductor element. The paper to be printed is placed in front of the printing stylus at such a distance that the printing stylus cannot vibrate.

According to the configuration according to the present invention, the number of elements to be moved is much smaller than that of the conventional configuration, so that noise generation is also reduced. Since there are few moving parts, power consumption is also low. Therefore, the overall lifespan is longer than that of the conventional structure. When selecting an elastically deformable conductor element, choose one that is rigid enough to displace the elastic element when a current is passed through it, thus requiring as little force as possible to print. Select.

In a preferred embodiment of the present invention, the conductive element is a wire bracket, one end of the bracket is clamped, the limbs extending from the clamping point are positioned in magnetic fields in different directions, and the printing needle is placed between the two limbs. be provided at the free ends of the interconnecting brackets. With such a configuration, even with a relatively small force, the printing needle can be relatively largely displaced toward the paper to be printed. Furthermore, in another example of the present invention, the conductor element is a straight wire,
The ends of the wire are clamped, the wire is placed in a magnetic field oriented perpendicular to the wire, and a printing needle is provided at the center of the wire. Such individual wires can easily be clamped at both ends.

Furthermore, the spring stiffness required to obtain maximum displacement with minimum supplied energy can be easily determined.

In another preferred embodiment of the invention, the conductor element is shaped like a square loop, through which the magnetic field flows at right angles, and one corner of the loop serves as a current lead-in and lead-out part. The one corner also serves as a clamp, and a printing needle is provided at the corner of the loop opposite to the l corner. The loop is configured such that the tip of the loop, which is provided with a needle, is displaced when a current is supplied.

In still another embodiment of the invention, a permanent magnet is provided which extends over the entire width of the printing drum and has a generally crescent-shaped cross section, and includes a number of elastically deformable conductive elements in the magnetic field of the permanent magnet. Provide one. Preferably, these conductor elements are located in a frame extending over the entire width of the magnet and are arranged in such a way that they extend obliquely to the magnetic field lines. The force generated along with the magnetic field when current is passed can be adjusted to some extent by the tilt angle of the conductive elements.

〔Example〕

An embodiment will be described below with reference to the drawings. FIG. 1 shows two permanent magnets 10 and 1 forming a magnetic field 12 between their poles.
1 is a perspective view of FIG. Three bracket-shaped elastically deformable conductor elements 13 are positioned in the magnetic field formed by these magnets, and one end of each of these conductor elements is clamped at a location indicated by 14. A printing needle 15 is provided at each free end of the conductor element. When a current is supplied to the bracket-shaped conductor elements 13 via the transformer 16, these conductor elements immediately move as shown by the arrow 17.
The printing needle 15 is elastically displaced in the direction shown by , and therefore the printing needle 15 moves in the direction of the printing drum (not shown).

The example shown in Figure 2 is an example in which the elastically deformable conductor elements are shaped like wires 18. In this case, both ends of the wires are clamped at the points indicated by 14, so that these wires are A printing needle 15 is provided at a location where the printing needle 15 is displaced. The direction of extension of the magnetic field 12 is perpendicular to the wire 18;
These wires are deflected in the direction shown by arrow 17.

In yet another example shown in FIG. 3, an elastically deformable conductive element is bent into a rectangular loop, and a printing needle 15 is provided at one corner of this loop. The roof 19 formed in this way is
On the opposite side of the printing needle 15, there is a current feed-in and a lead.
It has an out part. As soon as a current is applied to the loop 19, this loop contracts in the direction shown by the arrow 20, and the printing needle 15 is therefore displaced in the direction of the arrow 17.

Figure 4 shows a crescent-shaped cross section, with a magnetic field of 1 between its poles.
This is a perspective view of a part of a permanent magnet 21 that generates magnetic field 2, and an elastically deformable conductor element 23 (FIG. 5) is disposed obliquely on a frame 22 that is positioned in this magnetic field. . 24 indicates an ink ribbon, and 25 indicates paper to be printed. The conductors 23 are in the form of individual elastically deformable wires which are clamped to the frame 22 and are supplied with current from the circuit 26. The frame 22 can be a conductive plate, in which case the wiring to the power supply circuit 26 and the elastic wire 23 can be manufactured in one processing step, for example by etching. When a current is passed through the wire 23 in the direction indicated by the arrow 27, the elastic wire 23 is displaced in a direction perpendicular to the plane of the drawing. In this case, a component 12a of the magnetic field 12, which extends at right angles to the wire 2:B, acts. Therefore, the degree of force exerted on the wire 23 is determined by the degree of the inclination angle 28 of the wire 23, which is disposed obliquely on the frame 22.

FIG. 6 is a perspective view showing a part of a printer in which the elastically deformable conductive element 29 is shaped like a leaf spring, and each sub-magnet 30 is associated with the conductive element 29. 31 indicates a soft iron part. When a current is passed through the conductor 29 in the direction shown by the arrow 32, the leaf spring 2 whose one end is clamped
9 is displaced in the direction shown by the arrow 17, the printing needle 15
also moves in the direction of the paper to be printed.

FIG. 7 shows the displacement S of the conductor element as a function of time, and 33 indicates the maximum sweep of the printing needle;
34 indicates current transient time.

FIG. 8 is a perspective view of the print head according to the example shown in FIGS. 4 and 5. FIG. This printing head comprises a substantially crescent-shaped permanent magnet 21 which extends over the entire width of the ridge 25 to be printed, and between the poles of this magnet a magnetic field 12 as shown in FIG. 4 is generated. . In this magnetic field (not shown in FIG. 8), a frame 22 having the above-mentioned elastically deformable conductor elements 23 arranged obliquely is positioned. The abutment member 35 for the wire conductor is formed by filling the recess of the crescent-shaped permanent magnet with a non-magnetic material and curving the outer surface of the abutment member in the direction of the paper to be printed. 36 is a roller that presses the paper;
7 is a paper feed roller, and 38 is a paper guide.

A frame 22 on which a conductor 23 with a printing needle 15 is arranged obliquely is held by a fixed carrier 39. An ink ribbon 2 extending between the printing needle 15 and the paper to be printed
4 is fed from an ink ribbon transport roller 40. magnet 2
1 and a conductor 23 provided with a printing needle 15, the printing head is not moved longitudinally in this example, since it extends over the entire width of the paper to be printed.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing a partial configuration of a needle printer with bracket-like conductive elements in two oppositely oriented magnetic fields; Figure 2 shows the ends of the wires oriented at right angles to these wires; Figure 3 is an explanatory diagram showing an example of clamping a loop-shaped conductor element in a magnetic field oriented perpendicular to the plane of the loop; A perspective view showing an example with permanent magnets extending throughout; Figure 5 is a plan view showing the arrangement of conductor elements for the configuration of Figure 4; Figure 6 shows individual magnets and leaf spring-like A perspective view showing an example having a conductive element; FIG. 7 is a characteristic diagram showing the displacement characteristics as a function of time of the conductive element according to the invention; FIG. 8 is an actual diagram of the example shown in FIGS. 4 and 5. FIG. 3 is a perspective view showing a part of the print head of FIG. 10, 11... Permanent magnet 12... Magnetic field 13.
... Bracket-shaped conductor element 14 ... Clamp point 15 ... Printing needle 16 ...
...Transformer 17...Print needle displacement direction 18
...Wire-shaped conductor element 19...Loop-shaped conductor element 20...Loop contraction direction 21...Permanent magnet 22
...Frame 23...Wire-shaped conductor element 24...Ink ribbon 25...Gi 26...
Power supply circuit 27... Current direction 28... Wire inclination angle 29... Leaf spring-like conductor element 30...
Sub-magnet 31...Soft iron portion 32...Current direction 35...Abutting member 36...Paper presser roller 37...Paper feed roller 38...Guide
39... Fixed carrier 40... Ink ribbon transfer roller

Claims (1)

[Claims] 1. A needle printer that operates a printing needle by applying a current to the conductor by utilizing the force exerted on the conductor in a magnetic field, which includes at least one elastically deformable conductor element (1).
3, 18, 23, 29), each of these conductor elements is clamped as an individual conductor, and a printing needle (15) is provided at the maximum displacement point of each conductor element. , the conductor element is a wire bracket (13), one end of this bracket is clamped, and the clamping point (
The rims (13', 13'') extending from the printing needle (14) are positioned within the magnetic field (12) in different directions, and the printing needle (
15) is provided at the free end of the bracket that interconnects the two rims (13', 13'').
The needle printer described in . 3. The conductor element is a straight wire (18), both ends of the wire are clamped, the wire is placed in a magnetic field (12) oriented perpendicular to the wire, and the wire is placed in the center of the wire. 2. A needle printer according to claim 1, further comprising a printing needle (15). 4. The conductive element is shaped like a rectangular loop (1
9), a magnetic field flows through the loop at right angles, one corner of the loop acts as a current lead-in and lead-out, and the one corner also serves as a clamp;
The lead printer according to claim 1, characterized in that a printing needle (15) is provided at a corner of the loop opposite to the one corner. 5. The elastically deformable conductive element (13, 18, 1
A needle printer according to claim 1, characterized in that the needles (9, 23) are arranged in a fixed manner distributed over the entire width of the printer. 6. A permanent magnet (21) extending over the entire width of the printing drum and having an approximately crescent-shaped cross section is provided, and a conductive element (23) is elastically deformable in the magnetic field (12) of the permanent magnet. 6. The needle printer according to claim 1, wherein a large number of needle printers are provided. 7. The needle printer according to claim 6, wherein the frame extending over the entire width of the permanent magnet is provided with a conductive element (23) extending at an angle with respect to the magnetic field. 8. The elastically deformable conductive element (13, 18, 1
5. The needle printer according to claim 1, wherein the needle printer 9) is arranged in a longitudinally deformable printing head. 9. Elastically deformable conductor elements (in the form of leaf springs) between permanent magnets (30) arranged in the longitudinally displaceable printing head or fixedly arranged over the entire width of the printer ( Claim 1 characterized in that 29) is provided.
The needle printer described in . 10. Claim 6, characterized in that the recess formed by the crescent-shaped permanent magnet (21) is filled with a non-magnetic material (35) that acts as an anvil for the printing needle (15).
or 7. The needle printer according to any one of 7.