JPH0228378B2 - SHURETSUDAA - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a shredder for shredding documents and the like.

Construction of the conventional shredder and its problems The conventional shredder requires manual closing of the starting switch after the material to be shredded is put into the input port, which makes operation cumbersome. In addition, as a device to detect the presence of the object to be cut, a light emitting element and a light receiving element that controls the power supply to the motor in response to the arrival of light are installed in the input slot, and the power to the motor is automatically turned on when paper is inserted. There are many paper shredders that turn on and off automatically, but with this method, when the paper to be shredded is thin, the light from the light-emitting element passes through and cannot be detected by the light-receiving element. I had to invest in it later. Furthermore, even if the paper being thrown in is small or thrown in at an angle, it may not be detected by the light-receiving element, which is very inconvenient.

Furthermore, as a countermeasure to this problem, there is a conventional example in which several light-emitting elements and light-receiving elements are arranged in parallel on both sides of the long side of the input port, but this increases the cost. It was not possible to supply cheap products to the market.

Purpose of the Invention The present invention solves the above-mentioned conventional drawbacks, and has the ability to
To provide a shredder that can reliably automatically start and stop under any conditions.

Structure of the Invention The present invention is characterized in that a signal generator and a receiver of a control device that detects the presence of an object to be shredded with respect to the input port and controls the start/stop of the drive section are provided on a diagonal line of the input port. The presence of objects to be shredded is reliably detected by diagonal line detection.

Description of examples Examples thereof will be described below with reference to the accompanying drawings.

In Figs. 1 to 5, reference numeral 1 has a cutter 2 and a drive section 4 such as a motor for driving the cutter 2 via a speed reducer 3, and has an opening for inserting objects to be shredded at the top. 5 is a shredder main body having a shredded waste outlet 6 formed at its lower part, and a device for detecting the presence of the material to be shredded, such as a light emitting element 7, on one side diagonally on both sides of the inlet 5.
However, on the other side, a device that detects the light and controls the start/stop of the drive section 4, for example, a light receiving element 8, is disposed facing each other. Reference numeral 9 indicates a drive circuit for the drive unit 4. When paper to be shredded is not loaded, the drive unit 4 is stopped by an ON signal from the light receiving element 8 that receives light from the light emitting element 7, and the paper is shredded. When the light-receiving element 8 is turned off by turning on the light, the driving section 4 is started.

According to the above configuration, even when paper with high light transmittance is put into the input port 5, the paper slightly cuts the light beam between the light emitting element 7 and the light receiving element 8 diagonally, so that the paper does not pass through the paper. The light flux must pass through a portion of the paper that is thicker than its actual thickness to reach the light receiving element 8, and thereby the amount of light given to the light receiving element 8 changes reliably.

To further explain, as shown in Figure 6, the light applied to paper A has an angle θ with respect to the normal line of paper A, so the apparent thickness of the paper is much larger than the actual thickness t. .

Furthermore, when inserting paper with a small width, the light beam can be shredded not only at the center in the longitudinal direction of the input slot 5 but also near both left and right ends, making it possible to shred the paper. A similar effect can be obtained when the paper is loaded diagonally.

In the above embodiments, if a light emitting element that emits infrared rays is used, it is possible to perform detection with good illumination properties and less affected by external light. Furthermore, instead of the light emitting element and light receiving element described above, it is also possible to use other detection means such as an ultrasonic transmitting element and its receiving element.

Effects of the Invention As described above, according to the present invention, it is possible to provide a shredder that can reliably shred paper regardless of paper quality, paper size, and even paper feeding form.

[Brief explanation of drawings]

Fig. 1 is an external perspective view of a shredder showing an embodiment of the present invention, Fig. 2 is a side longitudinal sectional view, Fig. 3 is a transverse sectional view, Fig. 4 is a vertical sectional view, and Fig. 5 is an electric circuit diagram. , FIG. 6 is an explanatory diagram showing the transmission state of light through the inserted paper. 1...Shredder body, 2...Cutter, 4
... Drive unit, 5 ... Input port, 6 ... Discharge port, 7 ...
... Signal generator (light emitting element), 8... Receiver (light receiving element).

Claims (1)

[Claims] 1. A shredder main body that incorporates driving parts such as cutters and motors, and has an input port for paper to be cut at the top and a discharge port for paper scraps after cutting at the bottom, and an object to be cut for the input port. and a control device that detects the presence of the drive unit and controls the start and stop of the drive unit, the control device comprising a signal generator and a receiver that are diagonally disposed opposite to each other in the input port.