JPH0628519Y2 - Media detection structure of media feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a medium detection structure for confirming whether a medium is properly inserted.

Conventionally, most of the sensors for confirming whether or not the medium is properly inserted in the medium feeding device are mechanical type, for example, those detected by a lever.

Therefore, there are drawbacks in that the accuracy is lowered due to the variation in the mechanism, the reliability is poor, the lever sensor separates the medium from the sliding contact portion, and the lever interferes with the medium during traveling of the medium and scratches the medium.

An object of the present invention is to solve the above-mentioned drawbacks and to propose a medium detecting structure of a medium feeding device capable of confirming correct insertion of a medium with high reliability.

A feature of the present invention is that when a gap is created at a contact point between the medium and a guide wall of a medium feeding device that conveys the medium by contacting the medium with a guide wall provided on one side of the medium traveling path, light is guided through the gap. That is, the light emitting / receiving elements are arranged so as to be inclined from above and below the medium traveling path so as to pass therethrough, and the separation of the medium from the guide wall is detected.

The present invention will be described below with reference to the illustrated embodiments.

In FIG. 1, the medium feeding device includes a plurality of shafts 2, 3, 4 on a device frame 1.
Are rotatably arranged in tandem, large and small pulleys 5 and 6 are fixed to both ends of a shaft 2 on the rear stage side, and a belt 9 is stretched between the large-diameter pulley 5 and a pulley 8 of a drive motor 7. Pulleys 10 and 11 are fixed to one end of the shaft 3, and a pulley 12 is fixed to one end of the shaft 4 on the upstream side. A belt 13 is provided between the pulley 6 and the pulley 10, and a belt 14 is provided between the pulley 11 and the pulley 12. Each is stretched.

A roller 15 on the rear stage side and a magnetic head facing roller 16 are fixed to the shaft 2, and feed rollers 17 and 18 with one-way clutches are attached to the shafts 3 and 4 on the middle and front stages, respectively, and the shaft 3 is magnetic. The head facing roller 19 is fixed.

The feed rollers 15, 17 and 18 have shafts 20 and 2 respectively.
Pinch rollers 23, 2 rotatably supported by 1, 22
4 and 25 are opposed to each other, and magnetic heads 26 and 27 are opposed to the rollers 16 and 19, respectively.

A magnetic recording band 29 is provided on the medium 28 conveyed by the feeding device.
Is provided.

In the medium detecting structure of the medium feeding device, one side on the inner side of the container frame 1 serves as the medium guide portion A of the guide wall, and two sets of the light emitting elements 30, 31 and the light receiving elements 32, 33 are provided in the container frame 1 on the medium traveling path. Are arranged facing each other in the inclination direction from above and below toward the medium guiding portion A (see FIG. 3), and the medium guiding portion A is constituted by a surface having an appropriate reflectance, and the leading end of the medium 28 is detected in the vicinity of the front roller 18. Sensors 34 and 35 are provided.

The medium detection structure of the medium feeding device is configured as described above,
When the medium 28 is inserted from the medium insertion port along the medium guide portion A, the light emitting element 30 and the light receiving element 32 are provided as shown in FIGS.
It is possible to detect that the medium is correctly inserted by blocking the light of the light emitting element from passing through the medium and blocking the light of the light emitting element. Further, the tip of the medium advances to detect the tip detecting sensor 34,
After passing 35, the drive motor 7 is rotated by the detection signal, and the medium is fed by the feed roller 18 and the pinch roller 25 on the upstream side.
Is taken into the apparatus by the following, and is further conveyed to the latter stage by the middle stage feed roller 17 and the pinch roller 24, and then conveyed to the latter stage side by the latter stage feed roller 15 and the pinch roller 23, and magnetic recording is performed during the conveyance. Signal processing such as reading and writing is performed by the magnetic head that is in sliding contact with the belt 29.

When the medium is separated from the medium guide portion A as shown in FIGS. 4 and 5 when the medium 28 is inserted, the light from the light emitting elements 30 and 31 enters the gap between the medium and the guide portion A and is reflected to receive the light receiving element 32.
33 is reached and it is detected that the insertion state is not correct,
Even when the tip of the medium reaches the positions of the sensors 34 and 35, the drive motor 7 is not rotated and the medium is not taken into the device by the feed roller.

Even if the light of the light emitting element reaches the light receiving element to some extent, if the gain of the amplification circuit of the light receiving element is adjustable,
The amount of the gap between the medium and the medium sliding contact portion can be detected, and the drive motor can be rotated if the gap is very small and the range is readable and writable, and the gain is set when the reflectance of the reflecting surface is good. It can also be adjusted.

Further, although it has been described that the magnetic recording band is provided on the medium and the signal processing is performed by the magnetic head, the signal processing may be performed by the optical sensor instead of the magnetic head.

Further, the light emitting element and the light receiving element may be a light receiving / light emitting member other than a light emitting diode or a photodiode.

In the above description, the medium feeding device that conveys the medium by the feed roller is described, but it may be used in the medium feeding device that moves the medium by the manual operation, and in that case, the separation between the medium and the medium guiding portion is particularly detected. It is preferable that the detection signal of the light receiving element indicates that the structure is highly effective and that reading and writing cannot be performed from the medium in the separated state.

Since the present invention is configured as described above, the light-receiving element and the light-emitting element can be inclinedly arranged toward the guide portion at a position apart from the guide wall for easy mounting, and the correct running of the medium can be detected with high accuracy without contact. It is possible to provide a medium feeding device that has a practically excellent effect that the damage to the medium can be eliminated.

[Brief description of drawings]

An embodiment of the present invention is shown in the drawings, FIG. 1 is a perspective view of the structure of a medium feeding device and a medium detecting structure, FIG. 2 is a plan view of the medium in contact with a guide portion of a guide wall, and FIG. Is the same sectional view,
FIG. 4 is a plan view showing a state in which the medium is separated from the guide portion, and FIG.
The figure is the same side view. 1 ... Vessel frame, 28 ... Medium, 30, 31 ... Light emitting element,
32, 33 ... Light receiving element, A ... Guide section.

Claims (1)

[Scope of utility model registration request] 1. In a medium feeding device for carrying a medium by bringing a medium into contact with a guide wall provided on one side of a medium running path, a gap is created at a contact point between the medium guiding portion of the guide wall and the medium. The medium of the medium feeding device, in which the light emitting / receiving elements are arranged so as to oppose each other in the inclination direction from the upper and lower sides of the traveling path toward the guide portion so that the light passes through the gap, when detecting the separation of the medium from the medium guide portion. Detection structure.