JPH03119705A - Cutter head for carving card - Google Patents

Abstract

PURPOSE:To decrease the manufacturing cost and contrive miniaturization of this device by supporting an armature so that it can be rolled around an armature part located in the inner space, as a center, by means of leaf springs arranged on the yoke section at the opposite sides in the field direction with respect to the armature. CONSTITUTION:An armature 20 is supported elastically in a field yoke 11 from both sides in the field direction by means of a leaf spring 28 under a state where gaps 13, 14 accomode the displacement of an armature 20 at the opposite ends. Once picture current signals of a carving object are supplied to a coil 18, a magnetic field is made in front and rear of the armature 20. Consequently, in the gaps on both sides, magnetic poles are produced in the field direction according to the current direction and the armature allows the leaf spring to bounce elastically by the magnetic action with the field and to roll from normal state around the center part of a part located at the inside of inner space. In this way, a cutter 25 which is mounted at the front end of the armature performs displacement along the field direction.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides a method for inserting an armature into the internal space of a field yoke having gaps on both front and rear sides, with its front and rear ends leaving gaps within the gaps. It is supported so that it can swing in the state of
Furthermore, a coil is housed in the internal space so as to surround the armature, and by supplying a video current signal to this coil, the cutter attached to the front end of the armature protruding from the gap is displaced toward the ink layer. This product relates to cutter heads for engraving cards such as certificates and credit cards.

(Prior Art) Fig. 6 shows a conventional cutter head for card engraving of this kind, in which the field yoke l has two yoke parts 1a provided with recesses 2a as magnetic paths on both front and rear sides. They are attached to the side plate 7 so as to be spaced apart from each other so as to form a functioning gap 3.3a. This field yoke has a permanent magnet 1b.
An armature 4 formed by laminating silicon steel plates is embedded in the internal space 2 formed by the recess 2a.
It is surrounded by a coil 8. The armature 4 has a torsion bar 6 inserted therein and is supported by the side plate 7 of the yoke l on both sides thereof, and roughly the front and rear ends of the armature 4 are connected to a gap 3 which generates a magnetic field.
They are located within 3a with a gap between them. A cutter (not shown) is attached to a portion of the armature front end 4a that protrudes from the yoke l.

The permanent magnet 1b is magnetized in the vertical direction as seen in the figure, and generates a field magnetic field in the same direction in both the gaps 3 and 3a. When a video current signal of the object to be engraved is supplied to the coil 8, a magnetic field is generated in the armature 4 in the front and back direction, and therefore, depending on the direction of the current, for example, the front end 4a has both the N pole and the rear end at both the upper and lower ends. 4b are both magnetized to the S pole, and swing around the torsion bar 6 as the center of rotation.
The cutter attached to is displaced in the ai (up and down) direction.

[Problem to be solved by the invention]

However, in order to support the armature 4, the torsion bar 6 is passed through the armature 4, and both ends of the torsion bar 6 are supported by the side plate 7, which makes assembly work with the armature itself and the side plate complicated, and the support structure is also difficult. It was bulky.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a cutter head for card engraving of the type mentioned at the beginning, which can reduce manufacturing costs and can be made smaller.

(Means for Solving the Problems) In order to achieve this object, the present invention allows the armature to be connected to the internal space by leaf springs attached to the yoke portions on both sides of the armature in the direction of the magnetic field. It is characterized by being swingably supported around a positioned armature portion.

(Function) The armature is elastically supported within the yoke from both sides in the field direction by leaf springs, with the front and rear ends leaving a gap for displacement in the normal state. When a video current signal of the object to be engraved is supplied to the coil, a magnetic field is generated in the armature in the front and back direction. Therefore, in the gaps on both front and rear sides, a magnetic pole with a polarity corresponding to the current direction is generated in the field direction at the end of the armature, and due to the magnetic force interaction with the field, the armature elastically bends the leaf spring and is positioned in the internal space. It swings from its normal state around the center of the part as the center of rotation. This causes the cutter attached to its front end to be displaced along the field direction.

〔Example〕

1 to 3 show a cutter head for card engraving according to one embodiment of the present invention.

In these figures, 11 is a field yoke, and has a yoke portion 11a provided with a recess 12a forming an internal space 12.
are fixed by side plates 17 on both sides, facing each other in a spaced-apart manner so as to form gaps 13 and 14. By embedding the permanent magnets 11b, field magnetic fields in the same direction are generated between the gaps 13 and 14, respectively. A coil 18 is housed in the internal space 12 within the field yoke 11, and both ends thereof are exposed from the side plate 17. The armature 20 is formed by laminating silicon steel plates, and has a raised part 21 formed in the middle part located in the internal space 12, and the armature front end part 22 and the armature rear end part 23 are formed in the gaps 13 and 14 on both sides. It invades by leaving a gap for displacement. Armature front end 22
protrudes from the gap 13, and a cutter rod 27 is lowered. The lower end of this rod is the leaf spring 2.
Along with being supported by 5a.

A chuck 25b is provided and a cutter 25 is attached. At the rising portions of the front and rear, upper and lower corners of the raised portion 21, there are arcuate spring seats 21 whose center points are located diagonally outward.
A is formed.

28 is a leaf spring that supports the armature 20;
As shown in the figure, the width thereof is, for example, 12 mm corresponding to the width of the armature 20, the tip portion 28a is bent into a substantially circular shape with a radius of about 1.5 mm corresponding to the spring seat 21a, and each base portion 28b is tapered and slightly widened. The base 28b is connected to the yoke 1
Approximately 45 mm toward the spring seat 21a on the wall of the recess 12a of No. 1
It is elastically set in a spring locking groove 11c formed in the ° direction in an almost closed state. As a result, the armature 20 is elastically pressed toward the center from an oblique direction by the leaf springs 28 at four spring seats 21a at symmetrical positions in the intermediate portion 26, and in a normal state, the armature end is pressed against the gap 13.14. The portions 22 and 23 are supported with a gap in the field direction. Therefore, armature 20
The curved spring seat 21a is always elastically pressed from above and below to suppress displacement in the vertical and lateral directions, and when rotating in both directions around the center of the intermediate portion 26, The displacement in the front and rear direction is also restrained.

When a video current signal is supplied to the coil 18, the armature front end 22 moves along the field direction depending on the polarity of the video current signal.
That is, as seen in Fig. 2, the cutter 25 is oscillated upward or downward by an amount corresponding to the level, and the cutter 25 is correspondingly displaced almost vertically to peel off the ink layer on the card surface to correspond to the object to be imaged. When engraving is performed, the leaf spring 28 elastically expands or contracts in response to the displacement of the armature 20 from the normal state, and swings smoothly along the curved surface of the spring seat 21a.

FIG. 4 shows another embodiment of the present invention, in which the same reference numerals as in the previous embodiment indicate the same or equivalent parts, and the surface of the armature 30 is formed so that the middle part is flush with the end part,
A leaf spring 35 having a droplet-shaped cross section is engaged in a spring seat 31 formed as a rectangular recess on the back side of the WR surface. Its base is inserted into a V-shaped locking groove 32 formed in the gap 13, 14. Furthermore, as another embodiment, it is also conceivable to form one similar spring seat on one side and two similar spring seats on the opposite side of the armature 30, and to support it from both sides with three leaf springs.

FIG. 5 shows still another embodiment of the present invention, in which a cutter head used in a card engraving device according to Japanese Patent Application Laid-Open No. 1-184132 is driven in both the depth direction and the direction crossing the engraving line by a video signal. This shows head 4.
0 is composed of a head section 41 that displaces and drives an arm 46 to which a cutter 45 is attached in the vertical direction, and a head section 42 that displaces and drives the arm 46 in the cross direction. As a result, a cutter head that is displaced and driven in two axial directions can be formed in a small size.

(Effects of the Invention) As described above, according to the present invention, since the armature is supported by the leaf spring in the hollow part of the yoke and the gap, the conventional torsion bar penetrating the armature is not required. Since the support part is not required, the yoke side plate can be made thinner, and the thickness of the armature can also be made thinner, making it possible to make the head smaller and lighter.Since the torsion bar can be eliminated, it becomes easier to wind the coil, and the coil wire length can be reduced. Since the torsion bar can be made shorter, its Q can be increased.Furthermore, gap adjustment at one end of the torsion bar is not required, making assembly work easier.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a cutter head for card engraving according to an embodiment of the present invention, FIG. 2a is a front view of a cutter head according to the same embodiment, and FIG. , FIG. 3 is a perspective view of a leaf spring in the same embodiment, FIG. 4 is a sectional view of a main part of a cutter head according to another embodiment of the present invention, and FIG. 5 is a cutter head according to still another embodiment of the present invention. FIGS. 6A and 6B are a front view and a cross-sectional view of a conventional cutter head. 11...Yoke for field, llb...Permanent magnet,
12...inner space, 12a...recess, 13.1
4... Gap, 18... Coil, 20...
Armature, 25...cutter, 2nd...leaf spring.

Claims (1)

[Claims] A field yoke configured by two yoke portions each having a recess facing each other and separated from each other so as to form a gap forming a magnetic path on both front and rear sides, and an interior formed by the facing recess. The armature is arranged in a space and is swingably supported with both front and rear ends entering the gap with a gap, and a coil stored in the internal space so as to surround the armature. In a cutter head for card engraving, the armature is oscillated by supplying a video current signal of the engraving object to the coil, thereby displacing the cutter attached to the end of the armature protruding from the gap on the front side. The armature is supported so as to be able to swing around the armature portion located in the internal space by leaf springs respectively attached to yoke portions on both sides of the armature in the direction of the field magnetic field. Cutter head for card engraving.