JPS5919385B2 - Photoelectric paper tape reader - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper tape feeding device in a small paper tape reader or the like.

SUMMARY OF THE INVENTION An object of the present invention is to provide a paper tape feeding device that can be operated with little energy and can be made smaller and more efficient.

Another object of the present invention is to provide a paper tape feeding device that is easy to assemble and adjust and can be manufactured at low cost.

In a conventional paper tape feeding device, as shown in FIG. 1, the brake magnet 8 is energized and excited, and the brake armature 9
is attracted, and the paper tape 1 is stopped by being sandwiched between the brake magnet 8 and the brake armature 9.

When the start signal is input, the current in the brake magnet 8 is cut off and becomes non-excited, and the brake armature 9 is no longer attracted, and at the same time, current flows to the drive magnet T, energizing it, and attracting the drive armature 4. The drive armature 4 and the pinch roller 3 are fixed to the drive lever 5, and move up and down using the drive lever fulcrum shaft 6 as a fulcrum.
is attracted, and the pitch roller 3 is pressed against the capstan roller 2 via the paper tape 1. Since the capstan roller 2 is constantly rotating in the direction of the arrow a, the paper tape 1 held therein is sent in the direction of the arrow b, and the reading holes are read by the photoelectric elements 10 and 11. When a stop signal is input, the current in the drive magnet T is cut off, and at the same time, current flows in the brake magnet 8. Since the suction between the drive magnet 7 and the drive armature 4 is lost, the capstan roller 2
The pinch roller 3 is no longer pinched, and at the same time, the brake magnet 8 is energized and the brake armature 9 is attracted, so the paper tape 1 is stopped. Thereafter, the paper tape is started and stopped by repeating these steps.
When starting and stopping, the brake system and drive system must respond in the same way, but there is a delay due to the inertia and residual magnetism of each system. Although the start delay caused by the start signal is not very harmful, the ability to stop the paper tape by the stop signal depends on the performance of the paper tape feeding device itself. In order to increase the speed of paper tape readers, it is necessary to increase the paper tape stopping ability. Conventionally, the solution to this problem was to make the brake magnet stronger in order to improve this stopping ability. However, this method has disadvantages in that it requires a large brake magnet and a large current to flow, takes up space, and requires countermeasures against heat generation. The present invention eliminates such drawbacks and effectively utilizes the point in time when the residual magnetic flux of the drive magnet system is at its lowest in order to improve braking characteristics.

As shown in FIG. 2, when the paper tape 1 is being fed, the pinch roller 3 pinches the capstan roller 2. The capstan roller 2 is usually made of rubber or plastic, and the paper tape 1 is punched with holes.
Therefore, the contact area of the pinch roller 3 with the capstan roller 2 fluctuates. The amount of elastic deformation of the capstan roller 2 fluctuates. At the same time, the amount of displacement of the tip of the drive armature 4 about the drive lever fulcrum shaft 6 also changes, which leads to a change in the amount of gap between the drive armature and the drive magnet. FIG. 3 is a graph showing the amount of displacement of the pinch roller and the amount of gap between the drive armature and the magnet using punched holes in the paper tape.

As shown in Figure 3, when the pinch roller comes to the center of the punched hole in the paper tape, the amount of gap becomes smaller (gap A). Magnets have a great ability to attract amateurs. Conversely, at the intermediate position between the two punched holes, the gap amount is large (gap B) and the attractive force is small, so the residual magnetic flux is also the smallest. In the present invention, when the stop signal is input, the position of the pinch roller on the paper tape is at gap B in Figure 3, and the timing is Tl, T2.
It is best to design so that the

This makes it possible to improve the brake characteristics, make the brake magnet smaller, and reduce the current capacity. As described above, according to the present invention, it is possible to provide a paper tape feeding device that can be made smaller in size, facilitate high performance, and improve reliability. As described above, the present invention is an industrially useful invention and can be applied to other devices, and the scope of the claims is not limited.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a conventional embodiment, FIG. 2 is a detailed cross-sectional view of the paper feed section according to the present invention, and FIG. 3 is a diagram showing the punch holes in the paper tape and the displacement of the pinch roller. 2 is a graph showing the gap amount of the drive armature and the gap amount of the drive armature. 1...Paper tape, 2...Capstan roller, 3.
...Pinch roller, 4...Drive amateur, 5.
...Drive lever, 6...Drive lever fulcrum shaft,
7... Drive magnet, 8... Brake magnet, 9... Brake armature, 10... Photoelectric reading element, 11... Light emitting diode.

Claims (1)

[Claims] 1. In a photoelectric paper tape reader that uses a capstan roller and a pinch roller to feed the paper tape and read the information punched in the paper tape using a photoelectric element, the reader reads the punched holes on the paper tape and issues a stop signal. The distance between the tangential position and the reading unit is determined so that the tangential position of the capstan roller and the pinch roller sandwiching the paper tape is at the rear end position of the punch hole when the detection is performed. Photoelectric paper tape reader.