JPH03168914A - Structure for mounting magnetic head of card reader - Google Patents

Abstract

PURPOSE:To allow high-density recording by providing a positioning fitting hole to be fitted onto a positioning boss provided on the bearing of a transmission shaft or a reference plane for mounting the head in a fixing base part. CONSTITUTION:The position adjustment in the transverse directions of the magnetic head 1 is executed by loosening a pair of set screws 54 on one head fixing part (for example, 52a) side and rotating a pair of set screws 54 on the other head fixing part 52 side by the same rotating number. The head is then moved parallel in the fore and after direction, by which the head gap is aligned to the center of the positioning fitting hole 53, i.e. the center line of a transmission shaft 22b. The magnetic head 15 rotates within the horizontal plane and the inclination of the head gap with the center line of the positioning fitting hole 53 is adjusted when the rotating speed or rotating angle of a pair of the set screws 54 is varied. The spacing between the magnetic head 15 and a touch roller 16 is determined by strictly setting the distance from the center of the positioning fitting hole 53 to the head fixing parts 52a, 52b, more specifically up to the mounting position by the set screws 54.

Description

[Detailed Description of the Invention] [Industrial Application Field 1] The present invention is directed to a card reader that removes magnetic information recorded on a magnetic card such as a telephone card, and writes and confirms information on the magnetic card. This relates to the magnetic head mounting structure. [Prior Art] This type of card reader, which is generally incorporated in card-type public telephones, various vending machines, etc., uses a magnetic card to improve the accuracy of reading, writing, and checking magnetic information using a magnetic head. is pressed against the head gap 1 of the magnetic head by a touch roller.

[Problems to be Solved by the Invention] By the way, since magnetic information recorded on general magnetic cards such as telephone cards is written at a recording density of 0.12 mm, speed fluctuations may occur in the magnetic card, or If the magnetic head is improperly assembled, writing and reading errors, that is, jamming and loss of recorded information, occur, resulting in the inability to perform high-density writing. In other words, if a wobble of, for example, 0.31III occurs due to speed fluctuations, this cannot be ignored because it corresponds to a writing or reading failure of 2 bits of recorded information.
This is especially true for cards with high-density recording, such as IC cards and credit cards, and this becomes a major rWi problem. The following three types of magnetic head assembly errors can be considered as one of the major causes of such writing and reading errors. The first is the spacing error between the magnetic head and the touch roller, the second is the misalignment of the center lines between the magnetic head and the touch roller, and the third is the inclination of the head gag 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 will be separated from the magnetic head, making it impossible to write, read, and confirm information, and the distance between the second magnetic head and the touch roller will become too large. If the center line of the third magnetic head deviates in the card transport direction, the touch roller will not contact the head gap of the magnetic head correctly, the magnetic card will float from the head gap, and the head gap of the third magnetic head will be parallel to the touch roller. If the card is tilted instead of being tilted, the magnetic stripe cannot be pressed against the head gap with a uniform pressing force over its entire width, resulting in a situation where the magnetic card is tilted with respect to the transport direction. Therefore, in the past, the assembly and adjustment work of the magnetic head was carried out using a microscope and the like, but there were problems in that such work was extremely complicated, required time and manpower, and was difficult to assemble automatically.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and its purpose is to improve the magnetic head in the entire assembly! ! To provide a magnetic head mounting structure for a card reader which can be assembled by IIC adjustment, shortens assembly work, and enables automatic assembly.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a touch roller that is attached to a head attachment reference surface of a card reader casing via a head bracket, and that is attached to a transmission shaft. The head bracket includes a magnetic head that is pressed into contact with the magnetic head, and the head bracket integrally includes a fixing base that is closely fixed to the head mounting reference surface, and a head fixing part to which the magnetic head is attached so that the position thereof can be freely adjusted by an adjusting means. The fixed base is provided with a positioning hole that fits into a bearing of the transmission shaft or a positioning boss provided on the head mounting reference surface. [Function] In the present invention, the magnetic head is mounted to the head fixing portion of the head bracket in the subassembly process with its position adjusted by the adjustment means, and the head gap of the magnetic head is aligned with the center of the positioning fitting hole. In the overall assembly process, the fixed 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 into the bearing or positioning boss of the transmission wheel, thereby positioning the transmission shaft and the bracket. [Embodiments] The present invention will be explained in detail below based on embodiments shown in the drawings. Fig. 1 is an exploded oblique view showing one embodiment of the magnetic head mounting structure according to the present invention, Fig. 2 is a plan view showing the inside of the card reader with the cover removed, and Fig. 3 is a schematic cross-section of the card reader. Figure 4 is a sectional view taken along the line IV-IV in Figure 2,
FIG. 5 is an exploded perspective view showing the motor mounting structure. In these figures, 1 is a base that is long in the front and back direction, 2 is a cover that covers the top surface of the base 1, and these form a box-shaped housing 3 that is long in the rear direction.

The base 1 integrally includes a bottom plate 4 and a pair of left and right side plates 5 and 6, which are provided at both ends of the bottom plate 4 and extend upward and downward, and are opposed to each other in parallel. 7. Forms a card guide surface 8 that guides the bottom surface of the card. Base ■
A slit-shaped card insertion/return opening 9 into which the magnetic card 7 can be inserted is formed between the front end surface of the cover 2 and the front end surface of the cover 2 at the same height as the card guide surface 8. Of the pair of side plates 5 and 6, both sides of the right side plate 6 form mounting reference surfaces 6A and 6B, respectively, for brackets for mounting a drive motor and a magnetic head, which will be described later. Inside the casing 3, there are provided a card inlet passage 10 communicating with the card insertion/return port 9, and a card processing conveyance path 11 provided continuously at the back end of the card inlet passage NIO. , a plurality of sensors 12 that detect the card.
(12a to 12f), Card transport means for taking in the magnetic card 7 inserted into the force card insertion/return slot 9 and moving it back and forth along the card processing transport path 11; Shutter for preventing the insertion of the second card; mechanism 14, a magnetic head for reading, writing, and confirming magnetic information on the magnetic card 7■
5. A touch roller l6 that presses the magnetic card 7 against the magnetic head l5; a punch mechanism l that punches a small hole in the magnetic card 7;
7 etc. various mechanisms and parts are incorporated. The card conveying means l3 includes a total of four card conveying means 13 arranged vertically opposite each other with the card processing conveying path 11 in between.
rollers 20a to 20d, and bearings 2 on the base l, respectively.
1 (21a, 2lb, 2lC...), and a conveyor belt 23 stretched between upper rollers 20a, 20b. ．． The lower rollers 20c and 20d are disposed below the bottom plate 4 of the base l, and part of their circumferential surfaces protrude from the opening 24 provided in the bottom plate 4 to the upper surface side of the bottom plate 4, and the upper rollers 20a, 20b via a conveyor belt 23. The shaft 22b constitutes a transmission shaft that transmits the rotation of the drive motor 25 to the card transport means l3, and one end thereof protrudes outside the right side plate 6.
Moreover, a worm wheel 28 that meshes with a worm 27 provided at the output 11k26 of the drive motor 25 is provided at the protruding end.
is installed. The mounting structure of the driving motor 25 will be described in detail based on FIGS. 2, 4, and 5. The driving motor 25 is mounted on a motor mounting bracket 30 along the mounting reference surface 6A of the side plate 6. It is attached through the Bracket 30
As shown in FIG. 5, it is formed into an L-shape by bending a metal plate, so that it integrally has a fixed base 31A and a motor accommodating part 31B that are orthogonal to each other, and the fixed base 51A is It is fixed to the mounting reference surface 6A of the side plate 6 with a plurality of setscrews 32. Also, fixed group #3
A centering fitting hole 33 that fits into a part of the outer peripheral surface of the bearing 2lb is provided in the upper part of the bearing 1A. Motor housing part 3
The drive motor 25 is attached to a pair of setscrews 3 on the rear surface of 1B.
5, and its output shaft 26 is inserted into the insertion hole 36 provided in the center of the motor mounting part 31B to position the worm 27 on the front side of the motor mounting part 31B. We are trying to achieve a perfect fit. The adjustment work for mounting the drive motor 25 to the bracket 30 is performed using a mounting jig in the subassembly process. At this time, the center line of the centering fitting hole 33 and the output shaft 2
The intersecting angle (90°) with the axis of the output shaft 26, the distance between the axes, and the distance from the output shaft 26 to the fixed base 31A are adjusted. Then, in the overall assembly process, the centering fitting hole 33
is fitted into the bearing 2lb, and the fixed base 31A is fixed to the side plate 6 with the setscrew 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 distance between the axes, and the distance from the output shaft 26 to the fixed base 31A are adjusted in advance, the bracket 30 is fixed to the side plate 6 so that the drive motor 25 is horizontal, the bearing 22b fits into the centering fitting hole 33 and their axes coincide, so the intersection of the output shaft 26 and the transmission shaft 22b The angle and distance between the axes are also correct, and the output shaft 26 is connected from the side plate 6 as a reference plane.
This is because the distance to is also set correctly. Therefore, it is possible to prevent failures in writing and reading magnetic information due to assembly errors in the drive motor 25, and there is no need to adjust the drive motor 25 in the overall assembly process. The shutter mechanism 14 is located immediately after the card insertion/return slot 9 as shown in FIG.
is opened, and when the first card is taken in, it is operated by a card insertion detection signal from the card insertion detection sensor 12a to close the card intake passage 10 and prevent the insertion of the second card. It consists of a solenoid 40 disposed on the underside of the base 1, and a sheet magnet 4■ buried in the underside of the cover 2, facing the solenoid 40. Movable iron core 4 of solenoid 40
2 is at the lowest position in the de-energized state to open the card intake passage 10, and when the solenoid 40 is energized and energized, it is pulled up and held by the sheet magnet 41, opening the card intake passage IO. Close. The punch machine ellipse 7 includes a punch stand 44 and a solenoid 45 which are arranged vertically opposite to each other across the card receiving passage 10.
This is a conventionally well-known system consisting of:
By punching a small hole in the magnetic card 7, the approximate remaining balance information is displayed depending on the hole punching position. Note that a bunch bin (not shown) is integrally provided at the upper end of the movable core 46 of the solenoid 45. Now, the magnetic head 15 is attached to the head attachment reference surface 6B of the right-opening side plate 6 of the base l via a head bracket 51. As shown in FIG. 5, the head bracket 5l is formed into a U-shape in plan view by bending a metal plate, so that the head fixing portions M 5 2 a and 52 b facing each other and these head fixing portions 52 are formed by bending a metal plate.
a and a fixed base 52c connecting one end of 52b, and this fixed base 52c is fixed to the head mounting reference surface 6B of the side plate 6 with a set screw (not shown). A fitting hole 53 is formed in the upper end, and this fitting hole 53 is connected to the transmission shaft 22b (see FIG. 2).
The magnetic head l5 is fitted on the outer circumferential surface of the protruding end protruding inward of the right side plate 6 of the bearing 2lb which pivotally supports one end of FIG.
52b, and is fixed by a plurality of setscrews 54 (adjustment means). During this fixing, the magnetic head l5 is adjusted in the front-rear direction by the setscrew 54 so that the center of the head gap coincides with the center of the positioning fitting hole 53, and also rotated in a horizontal plane, that is, the center of the positioning fitting hole 53. The slope of the head gap relative to the line is adjusted. That is, the position adjustment of the magnetic head 1 in the longitudinal direction is performed using a pair of setscrews 5 on one head fixing part (for example, 52a).
4, and then tighten the other head fixing part (52b) til
When the pair of setscrews 54 of 1 are rotated by the same number of rotations or angle, they move in parallel in the front-back direction, thereby aligning the head gap with the center of the positioning fitting hole 53, in other words, with the center line of the transmission shaft 22b. Ru. Furthermore, by changing the rotational speed or angle of the pair of setscrews 54, the magnetic head 15 rotates in a horizontal plane, and the inclination of the head gap with respect to the center line (transmission shaft 22b) of the positioning fitting hole 53 is adjusted. .The distance between the magnetic head l5 and the touch roller 16 is as follows:
From the center of the positioning fitting hole 53 to the head fixing part 52a
, 52b. Strictly speaking, it is determined by strictly setting the distance to the mounting position using the set screw 54. Furthermore, the fitting error between the bearing 2lb and the positioning fitting hole 53 is as follows:
If it is about 1/Loomm, it can be ignored. magnetic head 1
Similar to the drive motor 25 described above, the installation adjustment work of No. 5 is performed using a mounting jig in the subassembly process, and after adjustment, resin is applied between the magnetic head 15 and the bracket 5l or to the screw attachment part. After being filled and solidified and rendered unadjustable, it is attached to the side plate 6 together with the bracket 5l in the overall assembly process. At this time, a slight rotation of the bracket 51 in the vertical direction hardly changes the head gap position, so it does not create resistance to card conveyance and can be ignored. Although the above embodiment describes the case where the positioning fitting hole 53 of the head bracket 5l is fitted to the bearing 2lb, the present invention is not limited to this. For example, the head mounting reference surface of the FLL plate 6 A positioning boss is integrally provided on 6B instead of a bearing,
Of course, the positioning fitting hole 53 may be fitted into this. [Effects of the Invention] As explained below, 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 high precision with respect to the head mounting reference surface of the housing and the transmission shaft. As a result, assembly and adjustment work in the overall assembly process is simple and easy, reducing work time and enabling automatic assembly, and also prevents errors in writing and reading magnetic information due to magnetic head assembly errors. It has excellent effects such as enabling high-density recording.

[Brief explanation of the drawing]

Fig. i is an exploded perspective view showing an embodiment of the magnetic head housing ellipse according to the present invention, Fig. 2 is a plan view showing the inside of the card reader with the cover removed, and 3rd Uyi is a schematic cross-section of the same card league. Figure 4 is a cross-sectional view of Figure 2 along line IV-IV,
Figure 5 is an exploded perspective view showing the motor mounting structure. 3... Housing, 5, 6... Side plate, 6B... Head mounting reference surface, 7... Magnetic card, 15... Magnetic head, 2lb... Bearing, 22b... Transmission shaft , 25...
Drive motor, 26...output shaft, 27...worm,
28... U-shaped wheel, 51... Head bracket, 52a, 52b... Head fixing part, 52b
・Going hole, 54・

Claims (1)

[Claims] A magnetic head is attached to the head mounting reference surface of the card reader casing via a head bracket, and a touch roller attached to a transmission shaft is pressed into contact with the magnetic head, and the head bracket is closely fixed to the head mounting reference surface. and a head fixing part to which the magnetic head is attached so as to be positionally adjustable by an adjusting means, and the fixing base includes a bearing of the transmission shaft or a positioning boss provided on the head mounting reference surface. A magnetic head mounting structure for a card reader, characterized in that a positioning fitting hole is provided for fitting into the magnetic head of a card reader.