JPH06103643B2 - Card head for card engraving - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention is designed to invade an armature into the internal space of a field yoke having front and rear gaps with the front and rear ends of the armature leaving a gap in the gap. Supported in a swingable state,
A coil is housed in the inner space so as to surround the armature, and a video current signal is supplied to this coil to displace the cutter attached to the front armature end protruding from the gap toward the ink layer. The present invention relates to a cutter head for engraving cards such as certificates and credit cards.

[Conventional technology]

FIG. 6 shows a conventional cutter head for card engraving of this type, in which a field yoke 1 has two yoke portions 1a provided with recesses 2a and a gap 3 which functions as a magnetic path on both front and rear sides. They are attached to the side plate 7 so as to face each other so as to form 3a. In this field yoke, a permanent magnet 1b is embedded, and an armature 4 formed by laminating silicon steel plates is arranged surrounded by a coil 8 in an internal space 2 formed by the recess 2a. And the armature 4
The torsion bar 6 is fitted in and both sides thereof are supported by the side plates 7 of the yoke 1. Further, the front and rear ends of the armature 4 are respectively provided with gaps in the gaps 3 and 3a generating the field magnetic field. positioned. Armature front end 4a
A cutter (not shown) is attached to a portion of the yoke protruding from the yoke 1.

The permanent magnet 1b is magnetized in the vertical direction as viewed in the figure, and both the gaps 3 and 3a generate a field magnetic field in the same direction.
When the video current signal of the engraving target is supplied to the coil 8,
A magnetic field is generated in the armature 4 in the front-rear direction, and therefore, depending on the current direction, for example, its front end 4a is magnetized to have N poles at both upper and lower ends and both S and S poles at the rear end 4b. The cutter, which is rocked, is attached to the front end portion 4a of the cutter and is displaced in the field (up and down) direction.

[Problems to be Solved by the Invention]

However, in order to support the armature 4, the torsion bar 6 is penetrated through the armature 4, and both ends of the torsion bar 6 are supported by the side plates 7. Therefore, the assembling work with the armature itself and the side plates is troublesome, and the supporting structure is also difficult. It was bulky.

Therefore, it is an object of the present invention to provide a card engraving cutter head of the kind mentioned at the outset, which can reduce the manufacturing cost and can be miniaturized.

[Means for Solving the Problems]

According to the present invention, in order to achieve this object, the armature oscillates around the armature portion located in the internal space by means of leaf springs attached to the yoke portions on both sides of the armature in the field magnetic field direction. Characterized by being supported as much as possible.

[Action]

In a normal state, the armature is elastically supported in the yoke from both sides in the field direction by leaf springs, with the front and rear ends having 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-back direction. Therefore, a magnetic pole having a polarity corresponding to the current direction is generated in the field direction at the end of the armature in the gap on the front and rear sides, and the armature elastically bends the leaf spring and is positioned in the internal space due to the magnetic force with the field. It swings from the normal state around the center of rotation. As a result, the cutter attached to the front end of the cutter is displaced along the field direction.

[Embodiment] FIGS. 1 to 3 show a cutter head for card engraving according to an embodiment of the present invention.

In these figures, 11 is a field yoke,
A yoke portion 11a having a recess 12a forming 12 is opposed to each other in a spaced state so as to form gaps 13 and 14, and both sides are fixed by side plates 17. And the permanent magnet 11b
Are embedded, the field magnetic fields in the same direction are generated between the gaps 13 and 14, respectively. Field yoke 11
A coil 18 is housed in the internal space 12 and both ends thereof are exposed from the side plates 17. The armature 20 is formed by laminating silicon steel plates, and a ridge 21 is formed in an intermediate portion located in the internal space 12, and the armature front end portion is formed.
The armature rear end 22 and the armature rear end 23 enter the gaps 13 and 14 on both sides with a gap for displacement. Armature front end
Reference numeral 22 projects from the gap 13, and a cutter rod 27 is provided below. The lower end of this rod is the leaf spring 25a.
Is supported by the chuck 25b, and the cutter 25 is mounted on the chuck 25b. Arc-shaped spring seats 21a whose center points are located diagonally outside are formed at the rising portions at the front, rear, upper and lower four corners of the raised portion 21.

Reference numeral 28 is a leaf spring that supports the armature 20. As shown in FIG. 3, its lateral width is, for example, 12 mm corresponding to the lateral width of the armature 20, and the tip portion 28a has a radius of 1.5 mm corresponding to the spring seat 21a. The base portion 28b is bent to have a substantially circular shape, and is tapered and slightly expanded. The base portion 28b is attached to the spring seat 21 on the wall of the recess 12a of the yoke 11.
In the spring locking groove 11c formed in the direction of about 45 ° toward a,
It is elastically set in the almost closed state. As a result, the armature 20 is elastically pressed from the oblique direction toward the center by the leaf springs 28 at the four spring seats 21a at the symmetrical positions of the intermediate portion 26, and in the normal state, the armature ends with respect to the gaps 13 and 14. The portions 22 and 23 are supported with a gap in the field direction. Therefore, the armature 20 is constantly elastically pressed from the vertical direction, thereby suppressing the vertical and lateral deviations, and when the armature 20 rotates in both directions with the central portion of the intermediate portion 26 as the rotation center, it has a curved surface shape. The spring seat 21a also restrains the displacement in the front-back direction.

When the video current signal is supplied to the coil 18, the armature front end portion 22 swings along the field direction, that is, upward or downward as viewed in FIG. When the cutter 25 is dynamically displaced, the cutter 25 is correspondingly displaced substantially in the vertical direction to peel off the ink layer on the card surface and perform engraving according to the imaging target. At this time, the leaf spring 28 elastically expands or contracts in response to the displacement of the armature 20 from the normal state, and smoothly swings along the curved surface of the spring seat 21a.

FIG. 4 shows another embodiment of the present invention, and the same reference numerals as those in the above-mentioned embodiments indicate the same or equivalent portions. The surface of the armature 30 is formed so that the middle portion is also flush with the end portion, and a leaf spring 35 having a drop-shaped cross section is inserted into a spring seat 31 formed as a recess having a rectangular cross section. Its base is gap 1
It is set in a V-shaped locking groove 32 formed in the 3 and 14 parts. Further, as another embodiment, it is conceivable to form one similar spring seat on one surface of the armature 30 and two similar spring seats on the opposite surface, and to support three leaf springs from both sides.

FIG. 5 shows still another embodiment of the present invention. A cutter head used in a card engraving apparatus according to Japanese Patent Laid-Open No. 1-184132 driven by a video signal in both the depth direction and the direction intersecting the engraving line. The head 40 is composed of a head portion 41 for displacing and driving the arm 46 to which the cutter 45 is attached in the vertical direction and a head portion 42 for displacing and driving the arm 46 in the intersecting direction. As a result, the cutter head that is driven to be displaced in the two axial directions is formed in a small size.

〔The invention's effect〕

As described above, according to the present invention, since the armature is supported by the leaf spring in the hollow portion and the gap of the yoke, the conventional torsion bar penetrating the armature is unnecessary. Therefore, the yoke side plates can be made thin because the supporting portions at both ends thereof are not required, and the armature can be made thin, so that the head can be made smaller and lighter. Since the torsion bar can be eliminated, the coil can be easily wound, and the wire length of the coil can be shortened, so that the Q can be increased. Further, it is not necessary to adjust the gap at the end of the torsion bar, which facilitates the assembling work.

[Brief description of drawings]

1 is a perspective view of a cutter head for card engraving according to one embodiment of the present invention, FIG. 2a is a front view of the cutter head according to the same embodiment, and FIG. 2b is a sectional view of the cutter head according to the same embodiment. FIG. 3 is a perspective view of a leaf spring in the embodiment, and FIG.
FIG. 5 is a sectional view of a main part of a cutter head according to another embodiment of the present invention, FIG. 5 is a perspective view showing a schematic configuration of a cutter head according to still another embodiment of the present invention, and FIGS. It is a front view and a sectional view of a cutter head. 11 ... Field yoke, 11b ... Permanent magnet, 12 ... Internal space, 12a ... Recess, 13, 14 ... Gap, 18 ... Coil, 20 ... Armature, 25 ... Cutter, 28 ... Leaf spring.

Claims (1)

[Claims] 1. A field yoke composed of two yoke portions each having a concave portion and facing each other so as to form a gap serving as a magnetic path on both front and rear sides, and an internal space formed by the facing concave portions. The armature, which is disposed in the interior of the armature, is swingably supported in a state where both ends of the front and rear sides are invaded with a gap in the gap, and a coil housed in the internal space so as to surround the armature. In the cutter head for card engraving, the armature is oscillated by supplying a video current signal of the engraving target to displace the cutter attached to the end of the armature protruding from the front gap. However, by means of leaf springs attached to the yoke portions on both sides of the armature in the field magnetic field direction, the armature located in the internal space is A cutter head for card engraving, characterized in that the cutter head is swingably supported around a Chure portion.