SU561980A1 - Device for synchronizing media movement - Google Patents

Description

one

The invention relates to automation and computing and can be used in devices for reading information from storage media such as a blank or card.

Arrangements are known for synchronizing the movement of the information carrier, one of which contains a photo sensor optically connected to the illuminator through the carrier and connected to the former 1. The closest technical solution to the invention is a device for synchronizing the movement of the information carrier containing the former transporting a drum with holes and a photo sensor mounted inside the conveying drum and optically coupled to the illuminator 2. However, the known devices are characterized by insufficient accurate detection accuracy of the information carrier in the reading area.

The aim of the invention is to improve the detection accuracy of the information carrier in the reading zone. In the described device, this is achieved by the fact that it contains an additional photo sensor and a logical element AND, the photo sensors being connected via a logical element AND to the driver. In addition, in the device transporting drum, the holes of one row are shifted

with respect to the holes of the other row and half step.

FIG. 1 shows a diagram of the described device; in fig. 2 - transporting the drum device with photo sensors.

The hollow transporting drum 1 contains inside two photosensors 2, which are connected via a logic element AND 3 to the former 4. The holes 5 in the transporting drum 1 form two rows, with the openings of one of them being offset from the openings of the other row by half a step between the openings, and the photosensors 2 are optically coupled through the openings 5 to the illuminator (not shown in the drawings).

The information carrier (punched card, blank) entering the reading zone is transported by the transport drum 1, and the edge of the information carrier, simultaneously blocking the flow of light from the illuminator falling on the photosensors 2, causes the output of the logic element AND 3 to enter the signal 4, which generates at its output a signal indicating the arrival of the information carrier in the reading zone.

Since the logical element I 3 produces a single signal only by simultaneous coincidence of the darkening of the photosensors 2, the intersection of the flow of light by bridges between otpeti mp 5 of the transporting drum 1, due to nx mix, epn relative to each other during the rotation of the drum 1, no change in the state of the logical element I 3 does not cause.

This eliminates the inaccuracy of detecting the edge of the information carrier due to its imposition on the lintel of the drum 1. And facilitates the structural arrangement of the photosensors 2 and the illuminator, which is the technical and ecomic effect of the invention.

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Claims (2)

1. A device for synchronizing the movement of an information carrier, comprising a driver, transporting an apertured drum and a photosensor mounted inside the transporting drum and optically coupled to the illuminator, i and i am so that, in order to improve the detection accuracy of the carrier in the reading zone, it contains an additional photo sensor and an AND logic element, and the photo sensors are connected via a logical element And to the shaper. 2. An apparatus according to claim 1, characterized in that in the conveying drum the holes of one row are offset from the holes of the other row by half a step. Sources of information taken into account in the examination. 1. The patent of France No. 2121964, cl. G 06K 7/00, publ. 1972. 2. USSR author's certificate A 368625, cl. G 06K 7/14, 1970.