JPS628836B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a card feeding mechanism of a card information reading device, in particular, a card is inserted between an elastic drive roller and a pressure roller, and the card is fed by the frictional force caused by the rotation of these rollers. The present invention relates to a card feeding mechanism.

In peripheral devices of electronic computer systems or terminal devices of various data collection systems, perforated or marked computer input cards are used as media for recording and holding original data in a form that can be read by a computer or the like. Such cards are fed one by one into a card information reading device attached to a computer or the like, and the information on the cards is read.
In this case, it is necessary to detect the position of the card that has been fed, and the means for this is to attach a disk to the shaft end of the feed roller, that is, the drive roller, and use a detector to detect the amount or angle of rotation of the disk. A timing disk method is often used that corresponds to the movement position of the card. In this case, it is necessary that the rotation amount of the disk and the transport distance of the card exactly match. FIG. 1 shows an example of sending a card using this method. two rollers 1, 2
Sandwich the card 4 with the rollers 1 and
The roller 2 is used as a driving side roller, and the other roller 2 is used as a driven side roller, and the card 4 is caused to travel by the frictional force between these rollers and the card 4. A disc 5 is attached to the shaft of the driving roller 1, and marks formed on the disc are detected by, for example, a photoelectric detector 6. If the above-mentioned frictional force is weak, the drive-side roller 1 will slip against the card 4, which will impede card feeding and make it impossible to accurately detect the feeding amount. Therefore, in order to increase this frictional force, one or both of the rollers 1 and 2 (especially on the drive side) must be made of an elastic material such as rubber to apply sufficient contact pressure.
However, in a rubber roller, the contact portion is deformed due to the influence of contact pressure, and the amount of deformation is not constant depending on various conditions, and the rotation radius of the drive-side roller 1 at the contact portion, and therefore the circumferential speed, is unstable. As a result, the amount of movement of the card 4 defined by the circumferential speed of the roller 1 and the amount of rotation of the disk 5 do not exactly match. For example, in FIG. 1, when the radius of the roller 1 at the contact part is r, the card feed amount corresponding to one revolution of the disk 5 is 2πr, but the contact pressure causes deformation of the contact part, and the roller 1 When the radius is r', the amount of movement of the card 4 is 2πr' even if the disk 5 rotates once, and this r' is not constant depending on the thickness of the card and feeding conditions, and is practically impossible to detect. Therefore, even if the amount of rotation of the disk 5 is accurately detected, the exact amount of movement of the card 4 cannot be read from it. In order to eliminate such deformation of the driving roller 1, if the roller is made of metal or a hard resin that does not deform, as described above, it will not be possible to obtain sufficient frictional force to move the card, and a large load will be applied. must be applied to the rollers, which creates extra loads on bearings, motors, etc. If the contact pressure is too high, it will be difficult to insert the card.

The present invention eliminates such conventional problems and
A card feeding mechanism of a card information reading device that uses an elastic roller with a large frictional force as a drive-side roller, and allows accurate detection of the card feeding amount or movement position even if the roller is deformed due to contact pressure. The purpose is to provide

For this purpose, the present invention has a hard position detection roller and a pressure roller that are elastically pressed against the circumferential surface of an elastic drive roller and held rotatably with equal force, and the position detection roller is used to detect the position. A plate is attached, a card is inserted between the drive roller and the pressure roller, and the card is fed by the rotational frictional force of the drive roller.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 is a perspective view schematically showing a card feeding mechanism according to an embodiment of the present invention, and FIG. 3 is a side view thereof, seen from arrow A in FIG. 2. A pressure roller 2 made of metal or hard resin is brought into rotatable contact with a drive roller 1 made of an elastic material such as rubber, and a card 4 is inserted between the rollers 1 and 2, and the frictional force between them is generated by the rotation of the drive roller 1. The card 4 is then fed into the card reading device. A position detection roller 3 made of metal or hard resin is brought into contact with the peripheral surface of the drive roller 1 on the opposite side of the pressure roller 2 with respect to the inserted card 4. The pressure roller 2 and the detection roller 3 are each supported by a compression spring 7 so as to be pressed against the drive roller 1 with equal force. A position detection plate 5 is attached concentrically to the shaft end of the detection roller 3, and a detection groove or scale mark 8 formed on the end face of the position detection plate 5 is detected by a suitable detector such as a photoelectric detector 6. As a result, the amount of rotation of the position detection plate 5, the amount of feed of the card 4, and the position of movement are detected.

When the card 4 is inserted between the pressure roller 2 and the drive roller 1 and fed, the pressing force of the pressure roller 2 causes the drive roller 1 to move by the amount indicated by δ in FIG. If it is elastically deformed by
Since the position detection roller 3 also presses the drive roller 1 with the same force, the drive roller 1 is similarly deformed by δ at the portion where it contacts the detection roller 3, and the radius of the drive roller 1 at both contact portions becomes the same. Therefore, the card 4, drive roller 1, position detection roller 3
Assuming that there is no slip in between, the amount of movement of the card 4 when the position detection plate 5 is rotated by an angle θ is determined by the radius of the position detection roller R, regardless of the amount of deformation δ.
As, 2πRθ/360. If the radius of the drive roller 1 does not change at both contact parts in this way, the card 4
The amount of movement of the position detection plate 5 is independent of the drive roller 1.
It can be detected from the rotation amount or rotation angle. If the position detection roller 3 is made of a material that does not deform and has accurate external dimensions, the card feed amount (travel amount) will always be constant.
and the rotation angle of the position detection plate 5 are accurately proportional to each other, and there is no need to consider a special processing method for achieving dimensional accuracy when processing the outer shape of the drive roller 1, which is an elastic body. By using a material with a high coefficient of friction, such as rubber, for the drive roller, cards can be reliably fed without slipping or the like with a small pressing force that does not put a burden on the bearing.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a conventional card feeding mechanism, FIG. 2 is a perspective view of a card feeding mechanism according to an embodiment of the present invention, and FIG. 3 is a side view seen from arrow A in FIG. . 1... Drive roller, 2... Pressure roller, 3...
Position detection roller, 4... Card, 5... Position detection plate (disc), 6... Detector, 7... Compression spring, 8
...Scale mark.

Claims (1)

[Claims] 1. A drive roller made of an elastic body, a hard position detection roller and a pressure roller that are elastically pressed against the circumferential surface of the drive roller with equal force, and a position detection plate attached to the position detection roller. ,
A card feeding mechanism for a card information reading device, characterized in that a card is inserted between the drive roller and the pressure roller, and the card is fed by rotation of the drive roller.