JP2609165B2 - Magnetic head mounting structure for card reader - Google Patents

Description

The present invention relates to a magnetic field of a card reader for reading magnetic information recorded on a magnetic card such as a telephone card, writing and checking information on the magnetic card, and the like. The present invention relates to a head mounting structure.

2. Description of the Related Art In general, a card reader of this kind incorporated in a card-type public telephone, various vending machines, and the like, uses a magnetic card to improve the accuracy of reading, writing, and confirming magnetic information by a magnetic head. Is pressed against the head gap of the magnetic head by a touch roller.

[Problems to be Solved by the Invention] Meanwhile, since magnetic information recorded on a general magnetic card such as a telephone card is written at a recording density of 0.12 mm, a speed fluctuation occurs on the magnetic card, or If the head is improperly assembled, poor writing and reading, that is, clogging and loss of recorded information, causing a problem that high-density writing cannot be performed. That is, if, for example, a gutter of 0.3 mm occurs due to speed fluctuations or the like, this cannot be ignored because it corresponds to writing or reading of 2 bits of recording information, and cannot be ignored.
This is especially true for credit cards and other cards on which high-density recording is performed.

An error in assembling the magnetic head, which is one of the major causes of such writing and reading defects, is as follows.
One can be considered. The first is a gap error between the magnetic head and the touch roller, the second is a deviation of the center line between the magnetic head and the touch roller, and the third is a tilt of the head gap with respect to the touch roller.

In this case, if the distance between the first magnetic head and the touch roller is too large, the magnetic card is separated from the magnetic head and cannot write, read and confirm information, and
If the center line between the second magnetic head and the touch roller is displaced in the card transport direction, the touch roller does not correctly contact the head gap of the magnetic head, and the magnetic card floats from the head gap. If the gap is not parallel to the touch roller and is tilted, the magnetic stripe cannot be pressed against the head gap with a uniform pressing force over its entire width, and the magnetic card may tilt with respect to the transport direction. I do.

Conventionally, the work of assembling and adjusting the magnetic head has been performed using a microscope or the like. However, such work is extremely complicated, requires time and labor, and has a problem that it is difficult to perform automatic assembly.

Accordingly, the present invention has been made in view of the above-mentioned conventional problems, and has as its object to enable the magnetic head to be assembled without adjustment in the entire assembly process, thereby shortening the assembly work and automatically assembling. It is an object of the present invention to provide a magnetic head mounting structure for a card reader which enables the above.

Means for Solving the Problems In order to achieve the above object, the present invention provides a touch panel mounted on a head mounting reference surface of a housing of a card reader via a head bracket, and mounted around a transmission shaft as a rotation center. The head bracket includes a fixed base that is closely fixed to the head mounting reference surface, and a head fixing portion to which the magnetic head is mounted so as to be position-adjustable by adjusting means. The fixed base is provided with a positioning fitting hole for fitting into the bearing of the transmission shaft.

[Operation] In the present invention, the magnetic head is mounted on the head fixing portion of the head bracket by adjusting the position in the sub-assembly process by the adjusting means, and the head gap of the magnetic head coincides with the center of the positioning fitting hole. When the fixing base of the bracket is brought into close contact with the head mounting reference surface of the housing and the positioning fitting hole is fitted to the bearing of the transmission shaft in the entire assembly process, the transmission shaft and the bracket are positioned.

EXAMPLES Hereinafter, the present invention will be described in detail based on examples shown in the drawings.

FIG. 1 is an exploded perspective view showing an embodiment of a magnetic head mounting structure according to the present invention, FIG. 2 is a plan view showing the inside of the card reader with a cover removed, and FIG. 3 is a schematic sectional view of the card reader. FIG. 4 is a sectional view taken along line IV-IV of FIG. 2, and FIG. 5 is an exploded perspective view showing a motor mounting structure. In these figures, reference numeral 1 denotes a base that is long in the front-rear direction, and 2 denotes a cover that covers the upper surface of the base 1. These form a box-shaped housing 3 that is long in the front-rear direction.

The base 1 is integrally provided with a bottom plate 4 and a pair of left and right side plates 5 and 6 which are provided on both side ends of the bottom plate 4 and extend in the vertical direction and are opposed to each other in parallel. 7
A card guide surface 8 for guiding the lower surface of the card is formed. A slit-shaped card insertion / return port 9 into which the magnetic card 7 can be inserted is formed at the same height as the card guide surface 8 between the front end surfaces of the base 1 and the cover 2.

Both surfaces of the right side plate 6 of the pair of side plates 5 and 6 respectively form bracket mounting reference surfaces 6A and 6B for mounting a drive motor and a magnetic head, which will be described later.

Inside the housing 3, there are provided a card taking-in path 10 communicating with the card inserting / returning port 9, and a card processing / conveying path 11 provided continuously at the inner end of the card taking-in path 10. , A plurality of sensors 12 (12a-1
2f), magnetic card 7 inserted in card insertion / return slot 9
Card transport means 13 for reciprocating along a card processing transport path 11, a shutter mechanism 14 for preventing insertion of a second card, a magnetic head 15 for reading, writing and checking magnetic information of the magnetic card 7, Various mechanisms and components such as a touch roller 16 for pressing the magnetic card 7 against the magnetic head 15 and a punch mechanism 17 for making a small hole in the magnetic card 7 are incorporated.

The card transporting means 13 includes a total of four rollers 20a to 20d which are vertically opposed to each other in a pair in front and rear with respect to the card processing transporting path 11, and bearings 21 (21a, 21
1b, 21c,...), And four shafts 22a to 22d rotatably arranged via the upper roller 20a, 20b. The lower rollers 20c, 20d are disposed on the lower surface side of the bottom plate 4 of the base 1, and a part of its peripheral surface protrudes from the opening 24 provided in the bottom plate 4 toward the upper surface side of the bottom plate 4, and the upper rollers 20a, 20b Are pressed against each other via a transport belt 23. The shaft 22b constitutes a transmission shaft for transmitting the rotation of the drive motor 25 to the card conveying means 13. One end of the shaft 22b projects outside the right side plate 6, and the drive motor 25 A worm wheel 28 that meshes with a worm 27 provided on the output shaft 26 is mounted.

The mounting structure of the drive motor 25 will be described in detail with reference to FIGS. 2, 4, and 5. The drive motor 25 is mounted on a motor mounting bracket along the mounting reference surface 6A of the side plate 6.
Mounted via 30. Bracket 30 is the fifth
As shown in the figure, the metal base plate is formed into an L shape by bending, so that the fixed base portions 31A orthogonal to each other are formed.
And the motor mounting portion 31B, and the fixed base 31A
Is a reference mounting surface of the side plate 6 by a plurality of set screws 32.
Fixed to 6A. In addition, a centering fitting hole 33 that fits into a part of the outer peripheral surface of the bearing 21b is provided above the fixed base 31A. The drive motor 25 is fixed to the rear surface of the motor mounting portion 31B by a pair of setscrews 35, and the output shaft 26 is inserted through an insertion hole 36 provided at the center of the motor mounting portion 31B to mount the worm 27 on the motor. Section 31B, the worm 27 and the worm wheel 28
Is engaged.

The mounting adjustment of the drive motor 25 to the bracket 30 is performed using a mounting jig in the sub-assembly process. At this time, the intersection angle (90 °) between the center line of the centering fitting hole 33 and the axis of the output shaft 26, the distance between the shafts, and the distance from the output shaft 26 to the fixed base 31A are adjusted. Then, in the entire assembly process, the centering fitting hole 33 is fitted into the bearing 21b, and the fixing base 31A is fixed to the side plate 6 with the set screw 32. As a result, the drive motor 25 is positioned and fixed with high precision with respect to the transmission shaft 22b, eliminating the need for adjustment work in the overall assembly process.

That is, as described above, if the intersection angle between the center line of the centering fitting hole 33 and the axis of the output shaft 26, the inter-axis distance, and the distance from the output shaft 26 to the fixed base 31A are adjusted in advance, the bracket When the drive motor 25 is fixed to the side plate 6 so that the drive motor 25 is horizontal, the bearing 21b fits into the centering fitting hole 33 and their axes coincide with each other.
This is because the intersection angle and the inter-axis distance of 22b also have correct values, and the distance from the side plate 6 as the reference plane to the output shaft 26 is also set correctly. Therefore, it is possible to prevent defective writing and reading of magnetic information due to an assembling error of the drive motor 25, and it is not necessary to adjust the drive motor 25 in the entire assembly process.

As shown in FIG. 3, the shutter mechanism 14 is located immediately after the card insertion / return port 9 to open the normal card take-in passage 10, and when the first card is taken in, the card insertion detection sensor The card insertion detection signal from the base 12a closes the card take-in passage 10 to prevent the insertion of a second card. The solenoid 40 is provided on the lower surface of the base 1, and the solenoid 40 And a sheet magnet 41 buried in the lower surface of the cover 2 so as to face the cover 40. The movable iron core 42 of the solenoid 40 is at the lowest position in the non-excited state and opens the card take-in passage 10, and when the solenoid 40 is energized and excited, it is attracted and lifted and held by the sheet magnet 41, thereby holding the card. Intake passage 10
To close.

The punch mechanism 17 is a conventional well-known type including a punch table 44 and a solenoid 45 which are vertically opposed to each other with the card take-in passage 10 interposed therebetween. When the service is completed, a small hole is formed in the magnetic card 7. By doing so, the approximate remaining amount information remaining at the drilling position is displayed. A punch pin (not shown) is integrally provided at the upper end of the movable iron core 46 of the solenoid 45.

The magnetic head 15 is mounted on a head mounting reference surface 6B of the right side plate 6 of the base 1 via a head bracket 51. The head bracket 51 is formed in a U-shape in plan view by bending a metal plate as shown in FIG.
a, 52b and a fixing base 52c connecting one end of the head fixing parts 52a, 52b. The fixing base 52c is fixed to the head mounting reference surface 6B of the side plate 6 by a set screw (not shown). Is done. A fitting hole 53 is formed at the upper end of the fixed base 52c.
2 (FIGS. 2 and 4) is fitted to the outer peripheral surface of a protruding end portion of the bearing 21b that supports one end of the bearing 21b and protrudes inside the right side plate 6.

The magnetic head 15 includes the pair of head fixing portions 52a and 52b.
It is inserted between and fixed by a plurality of setscrews 54 (adjustment means). At the time of this fixing, the magnetic head 15 is adjusted by the set screw 54 in the front-rear direction so that the center of the head gap coincides with the center of the positioning fitting hole 53, and rotation in a horizontal plane, that is, the center of the positioning fitting hole 53 The inclination of the head gap with respect to the line is adjusted.

That is, the position of the magnetic head 15 in the front-rear direction is adjusted by a pair of set screws 54 on one head fixing portion (for example, 52a).
When the pair of setscrews 54 on the other head fixing portion (52b) side are rotated by the same number of revolutions or angle, the head is moved in parallel in the front-rear direction, so that the head gap moves to the center of the positioning fitting hole 53. In other words, it is matched with the center line of the transmission shaft 22b. When the rotation speed or the angle of the pair of set screws 54 is changed, the magnetic head 15 rotates in a horizontal plane, and the inclination of the head gap with respect to the center line (the transmission shaft 22b) of the positioning fitting hole 53 is adjusted. .

Note that the distance between the magnetic head 15 and the touch roller 16 is set between the center of the positioning fitting hole 53 and the head fixing portions 52a, 52b,
Strictly, it is determined by strictly setting the distance to the mounting position by the set screw 54.

The fitting error between the bearing 21b and the positioning fitting hole 53 is 1/1.
If it is about 00 mm, it can be ignored.

Such mounting adjustment work of the magnetic head 15 is performed by using a mounting jig in the sub-assembly process, similarly to the drive motor 25, and after the adjustment, the resin is moved between the magnetic head 15 and the bracket 51 or the screw mounting portion. After being solidified and made unadjustable, it is attached to the side plate 6 together with the bracket 51 in the entire assembly process. At this time, a slight rotation of the bracket 51 in the vertical direction has almost no change in the head gap position, so that it does not become a resistance of card conveyance and can be ignored.

[Effect of the Invention] As described above, according to the magnetic head mounting structure of the card reader according to the present invention, the magnetic head can be positioned and fixed with respect to the head mounting reference surface of the housing and the transmission shaft with high accuracy. As a result, assembly and adjustment work in the entire assembly process is simple and easy, shortening the working time and enabling automatic assembly, and also prevents writing and reading defects of magnetic information due to magnetic head assembly errors, It has excellent effects such as enabling high-density recording.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view showing an embodiment of a magnetic head mounting structure according to the present invention, FIG. 2 is a plan view showing the inside of a card reader with a cover removed, and FIG. FIG. 4 is a schematic sectional view of the card reader, FIG. 4 is a sectional view taken along the line IV-IV of FIG. 2, and FIG. 5 is an exploded perspective view showing a motor mounting structure. 3 ... housing, 5, 6 ... side plate, 6B ... head mounting reference surface, 7 ... magnetic card, 15 ... magnetic head, 21b ... bearing, 22b ... transmission shaft, 25 ... drive motor, 26 …… Output shaft, 27 …… Warm, 28 …… Warm wheel, 51 ……
Head bracket, 52a, 52b ... Head fixing part, 52b
…… Fix base, 53… Centering fitting hole, 54… Set screw.

Claims (1)

(57) [Claims] 1. A magnetic head mounted on a head mounting reference surface of a housing of a card reader via a head bracket and pressed against a touch roller mounted on a transmission shaft as a rotation center, wherein the head bracket is A fixed base portion closely fixed to the head mounting reference surface and a head fixing portion to which the magnetic head is mounted so as to be position-adjustable by adjusting means are integrally formed, and the fixed base portion is fitted to a bearing of the transmission shaft. A magnetic head mounting structure for a card reader, wherein a positioning fitting hole is provided.