JP2604113B2 - Opposing roller for magnetic head for card - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opposing pressing roller of a magnetic head for a card, and more particularly to an opposing pressing roller of a magnetic head for a card for accessing magnetic information on a magnetic recording medium of the card by the magnetic head. About.

[0002]

2. Description of the Related Art Conventionally, a card having a magnetic stripe as a magnetic recording medium is transported so as to pass between a magnetic head and an opposing pressing roller, and the magnetic head accesses magnetic information to the magnetic recording medium. There is a card reader / writer configured as described above. FIGS. 2 and 3 show a conventional structure of the magnetic head and the opposing pressing roller of such a card reader / writer.

In the conventional example shown in FIGS. 2 and 3, a magnetic head 2 is disposed at a predetermined position in a casing of a card reader / writer (not shown) with its core facing upward. The opposing pressing roller 11 is provided above. The opposing pressing roller 11 is made of a synthetic resin material having a low coefficient of wear, and is formed of a leaf spring whose both free ends are supported by a pair of engaging pins 8a and 8b provided on the frame 7 of the casing. The magnetic head 2 is pivotally supported by the intermediate portion and is resiliently biased to the magnetic head 2.

In the above card reader / writer, the card 3 inserted into the casing from an insertion opening (not shown) and inserted between the magnetic head 2 and the opposing pressing roller 11 is moved by a card transport device (not shown) as shown in FIG. The magnetic head 2 accesses the magnetic stripe 3a as the magnetic recording medium of the card 3 by the magnetic head 2 during the conveyance. At this time, the card 3 is pressed against the magnetic head 2 by the opposing pressing roller 11 urged by the elastic support 4, and the magnetic stripe 3 a can resiliently come into close contact with the magnetic head 2. Reading or writing of information can be performed reliably.

In such a card transport structure, the card 3
Is pressed against the magnetic head 2, the opposing pressing roller 11 rolls on the surface of the card 3, and dust adhering to the card 3 may be transferred to the surface of the opposing pressing roller 11. Further, if the roller surface becomes uneven due to dust adhering to the surface of the opposing pressing roller 11 due to long-term use, the distribution of the pressing pressure applied to the magnetic head 2 by the opposing pressing roller 11 varies, and the writing level of the magnetic data is increased. In this case, there is a problem that the roller surface needs to be periodically cleaned because of variations in the image quality and deterioration of readability.

[0006]

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the prior art, a main object of the present invention is to provide a counter-pressing device for ensuring good writing and reading of data during long-term use. An object of the present invention is to provide an opposing pressing roller for a magnetic head for a card, which can prevent deterioration of a pressure distribution of pressing a card against a magnetic head by a roller.

[0007]

According to the present invention, there is provided a magnetic head for accessing magnetic recording information on a magnetic recording medium of a card to be conveyed, and a magnetic head comprising: a counter pressure roller of a magnetic head card having a counter pressure roller for pressing said card in order to close contact with the magnetic head to the magnetic head, base on the outer peripheral surface of the opposing pressing row La
A circumferential ridge having a cross-sectional shape is provided, and the circumferential ridge is
This is achieved by providing an opposing pressing roller for a magnetic head for a card , wherein the width of the top of the mountain is smaller than the width of the magnetic head.

[0008]

In this way, even if dust adhering to the card surface is transferred to the opposing pressing roller, the outer periphery of the roller
Provide a circumferential ridge with a trapezoidal cross section on the surface and
Since the width of the top of the mountain is narrower than the width of the magnetic head, the rigidity of the circumferential ridge is ensured while the
The contact pressure can be increased by reducing the width of the contact
Dust on both sides of the mountain-shaped circumferential ridge
It can be because, be prevented from being uneven remains dust protrusion of the roller surface. In addition, the contact portion of the outer peripheral portion of the roller with the card surface is small, and the amount of attached dust is small.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a preferred embodiment of the present invention.

FIG. 1 is a view similar to FIG. 3 of a conventional example showing an opposing pressing roller of a magnetic head for a card to which the present invention is applied. The card transport structure of the present embodiment is the same as the conventional card transport structure of FIG. 2, and a detailed description thereof will be omitted.

The opposed pressing roller 1 of this embodiment is disposed at a position facing the fixed magnetic head 2 as in the conventional example, and is elastic so as to elastically press the conveyed card 3 against the magnetic head 2. The card 3 is supported by a support 4 and is pivotally supported so as to be able to rotate along the transport direction of the card 3. When the card 3 passes between the magnetic head 2 and the opposing pressing roller 1 as described above, the card 3
Access of magnetic information to the magnetic stripe 3a.

On the outer peripheral surface of the opposing pressing roller 1 according to the present invention, as shown in FIG.
Thus, two circumferential grooves 6 are formed. In the opposing pressing roller 1 of the present embodiment, the circumferential pitch 6 is 3.5 mm in the axial direction so that the cross-sectional shape of the circumferential groove 6 has a trapezoidal shape. Card 6 of 5
The width of the top of the hill, which is the portion that contacts the ridge, is 0.5 mm, and the angle between the two inner surfaces of the circumferential groove 6 is 90 degrees. The number and shape of the circumferential ridges 5 are not limited to those in this embodiment, but it is preferable that the top of the ridge of the circumferential ridge 5 coincide with the track center of the magnetic head 2.

In the pressing roller of the magnetic head for a card constructed as described above, the card 3 is resiliently moved to the magnetic head 2 by the elastic support 4 while the card 3 is conveyed in the same manner as in the conventional example. To the magnetic stripe 3a
The magnetic information can be securely accessed by ensuring close contact between the magnetic head 2 and the magnetic head 2.

As described in the conventional example, even when the dust adhering to the card 3 is transferred to the opposing pressing roller 1, the circumferential pressing ridge 5 abuts on the card 3 in the opposing pressing roller 1 according to the present invention. And the surface pressure of the contact portion increases. For example, dust attached to the top of the mountain of the central circumferential ridge 5 is scraped out into each circumferential groove 6 on both sides of the mountain, and
As shown in FIG. 3, since the dust 9 is received in the circumferential groove 6, the card 3 of the circumferential ridge 5 of the opposing pressing roller 1 is formed.
The card 3 can be pressed against the magnetic head 2 with a uniform pressing force without any debris adhering to a portion in contact with the magnetic head 2. Further, since only the top of the circumferential ridge 5 contacts the surface of the card 3, the circumferential ridge 5,
The absolute amount of dust attached to the outer periphery is also small.

As described above, the amount of dust attached to the roller 1 is small, and even if dust is attached, the dust 9 is scraped out in the circumferential groove 6. Therefore, it is not necessary to frequently clean the roller periodically, and stable reading and writing of magnetic data can be performed over a long period of time. In particular, by making the circumferential ridge 5 coincide with the track center of the magnetic head 2 as described above, it is possible to ensure a suitable pressing state of the magnetic stripe 3a against the track of the magnetic head 2.

[0016]

As described above, according to the present invention, whether or not a circumferential ridge having a trapezoidal cross section is provided on the outer peripheral surface of the opposed pressing roller .
The width of the peak of the circumferential ridge is narrower than the width of the magnetic head.
Because of this, the width of the top of the mountain
It can be narrowed while securing rigidity, and the contact part with the card
The surface pressure of the
From Rukoto can scoop out, the width of the top of the circumferential ridges
As much as possible, it is possible to prevent dust from remaining on the surface of the opposing pressing roller , prevent the occurrence of magnetic data access failure due to the uneven shape due to the adhesion of the dirt, and to have the opposing pressing roller partially on the card. Contact force increases the pressing force per unit area,
The closeness of the magnetic head to the track can be increased to improve the accessibility of magnetic data information.

[Brief description of the drawings]

FIG. 1 is an enlarged view of a main part showing an opposing pressing roller according to the present invention.

FIG. 2 is a side view showing a main part of a facing pressing roller of a conventional magnetic head for a card.

FIG. 3 is an enlarged view of a main part as viewed along an arrow line III-III in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Opposing pressing roller 2 Magnetic head 3 Card 3a Magnetic stripe 4 Elastic support 5 Circumferential ridge 6 Circumferential groove 7 Frame 8a / 8b Engagement pin 9 Dust 11 Opposing pressing roller

Claims (1)

(57) [Claims] 1. A magnetic head for accessing magnetic recording information on a magnetic recording medium of a card to be conveyed, and for pressing the card against the magnetic head to bring the magnetic recording medium into close contact with the magnetic head. a counter pressure roller of a magnetic head card having opposed pressing rollers, the peripheral side of the trapezoidal cross-sectional shape on the outer peripheral surface of the opposing pressing row La
Provide a ridge and adjust the width of the top of the ridge of the circumferential ridge to the front.
An opposing pressing roller for a magnetic head for a card , wherein the width is smaller than the width of the magnetic head.