JPH0326468Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial field of application) The present invention relates to a paper detection device in a copying machine, etc., and in particular, the invention relates to a detection device for paper, etc. in a copying machine, etc. , relates to a configuration of a stop member of an actuator configured to perform paper sensing.

(Prior Art) As a paper detection device that has been commonly used in copying machines and the like, a combination of an actuator and a sensor as shown in FIG. 7 has been used. .

As shown in FIG. 3, when the paper 10 passes through the paper transport path, the actuator 4 is swung upward by the paper 10,
After passing 0, the actuator 4 stops in a hanging state as shown in FIG. When the actuator 4 is in a hanging state, a space 6 is formed between the light emitting part 6a and the light receiving part 6b of the sensor 6 as shown in FIG.
It is configured to enter the optical path c and block its optical path.

In the above-mentioned detection device, the state in which the sensor 6 is on is defined as a state in which paper 10 is detected, and the state in which the optical path of the sensor 6 is blocked by the actuator 4 and its output is turned off is defined as a state in which no paper is detected. I'm trying to detect it.

However, in the conventional detection device, as shown in FIG.
After the actuator 4 is swung upwards and the paper 10 has passed, as shown in FIG. This tends to cause the phenomenon of rebounding when it hits the stop portion 3a formed at the end of the hole 2 of No. 1.

That is, as shown in FIG. 5, the actuator 4, which is swung downward from a horizontal position, hits the stop portion 3a and rebounds as shown by the arrow in the figure, thereby blocking the optical path of the sensor 6. You may repeat the release motion many times.

When the above-mentioned actuator rebound phenomenon occurs, an inconvenient situation occurs in which the actuator 4 temporarily blocks the optical path of the sensor 6 after the paper 10 has passed, and then releases the optical path. At this time, a problem arises in that the sensor 6 outputs a paper detection signal multiple times in succession.

In addition, in the paper conveyance path of the copying machine, other devices of the copying machine, such as a timer for detecting a jam in the conveyance path, start operation based on the on/off signal from the sensor. It is composed of

However, as mentioned above, when a detection signal is output multiple times for one sheet of paper, the next sensor cannot obtain a detection signal in response to a later detection signal, which causes the device to fail. The control device may generate an alarm such as a paper jam and stop the copying operation. Further, there is a problem in that the apparatus is caused to malfunction by causing each mechanism of the apparatus to perform an extra operation.

Therefore, in conventional copying machines and the like, in order to prevent the actuator 4 from hitting the stop portion 3a and rebounding, a rebound prevention member 7 such as an elastic body is provided on the stop portion 3a, as shown in FIG. Although measures have been taken, such as forming the actuator 4 from a material with a low elastic modulus, the effectiveness thereof has been very low.

(Problems to be Solved by the Invention) The present invention attempts to eliminate the drawbacks of the conventional device as described above, and is capable of reliably preventing the actuator from rebounding by using a stop section for stopping the actuator. The purpose of this invention is to provide a device configured by such means.

(Means and operations for solving the problems) In the device of the present invention, a long hole is formed in the lower guide plate to allow swinging of the actuator, and a sensor is disposed below the hole.

Furthermore, the stop portion is formed by obliquely cutting out the upstream portion of the hole in the paper traveling direction, that is, the edge portion of the hole that the actuator comes into contact with when returning to the vertical position. Then, the actuator, which had been stopped in a horizontal position by the paper,
Even if the paper hits the stop part strongly due to its own weight when it swings downward after passing, the force is dispersed to the side, making it possible to stop the paper without causing any rebound phenomenon. .

(Embodiment) To explain the configuration of the detection device of the present invention according to the embodiment shown in FIGS. It is provided so that it can swing between the two.
When the paper passes through the paper conveyance path, the paper swings it to a horizontal position as shown by the chain line, and when the paper finishes passing, the actuator 4 swings in the downward direction due to its own weight, and the actuator 4 swings in the downward direction as shown by the solid line. As shown in , it is configured to be stopped in a vertical position.

As shown in FIG. 2, the lower guide 1 of the guides forming the paper conveyance path has an actuator 4.
An elongated hole 2 is provided to allow the swinging motion. This elongated hole 2 has a semicircular tip end (downstream part) in the paper traveling direction, but the edge of the upstream part in the paper traveling direction is cut out diagonally, and the actuator stops. It is formed as a division. This stop part 3
In the embodiment shown in FIG. 2, the inclination angle of the edge constituting the actuator 4 is 45 degrees with respect to the moving direction of the actuator 4.

In other words, by configuring the edge of the hole in which the stop part 3 is set to be cut out diagonally, the actuator 4 swings in the downward direction from a horizontal position under its own weight and hits the stop part 3. When it falls, the force Fa comes into contact with the oblique surface of the stop part 3 from an oblique direction, as shown in FIG. 2a. Therefore, when the actuator 4 hits, the force Fa acts in a direction perpendicular to the direction of movement of the actuator, that is, in the direction of arrow F.

Further, as shown in FIG. 7, the support shaft 5 of the actuator 4 is fixed to the support plate 5a, and the actuator 4 is swingable via the shaft 5. teeth,
It is designed so that it can only swing in a direction perpendicular to its axis. Therefore, even if the actuator 4 strongly hits the obliquely formed stop portion 3, an effect is exerted such that it is immediately stopped at the stop position.

That is, as shown in FIG. 3, when the actuator 4 is lifted up by the paper 10 and is in a horizontal position, after the paper has passed,
When the actuator 4 loses its support and swings downward due to its own weight, even if the actuator is a little heavy, the stop part 3
The force when it hits the object does not act as a force that opposes the direction of the swing.

Therefore, in the device of the present invention, even if the actuator 4 strongly hits the stop portion, it is possible to prevent an inconvenient condition such as a rebound phenomenon from occurring as in the conventional device.

Further, in the above embodiment of the present invention, the angle of the stop portion 3 is formed at 45 degrees, but
The angle is not necessarily limited as in the above embodiment, and the angle of the stop part can be arbitrarily changed depending on the materials of both the guide plate 1 and the actuator 4. is natural. Further, the sensor 6 is not limited to a transmission type optical sensor, and other sensors may be used.

In addition, although the above-mentioned embodiments show a case where it is applied to a conveyance path of a copying machine, etc., the detection device of the present invention is not limited to copying machines, but can also be used in facsimile machines, printers, etc. This can be applied to all paper handling devices such as the above.

(Effects of the invention) Since the detection device of the present invention has the above-described configuration, even if the actuator hits the stop part with a strong force, unlike the stop part in conventional devices, the actuator will not stop. It is possible to prevent the rebound phenomenon from occurring and, therefore, to prevent the occurrence of false detection by the sensor.

Further, the device of the present invention can simplify its mechanism by simply changing the shape of the hole provided in the guide plate, and there is no need to provide an elastic body or the like as in the case of conventional devices.

Furthermore, in the present invention, there are no restrictions on the material of the stop member, and it is possible to arbitrarily select and use an appropriate material depending on the type of copying machine and paper used. It is.

[Brief explanation of the drawing]

Figure 1 is a side view showing the structure of the actuator of the present invention, Figure 2 is a plan view thereof, Figure 2A is an explanatory diagram showing the relationship between the stop part and the actuator, and Figures 3 and 4 are paper sheets. 5 and 6 are explanatory views showing the operation of the actuator in a conventional device, respectively, and FIG. 7 is a perspective view showing the structure of the actuator and sensor. Symbols in the figure: 1... Guide plate, 2... Hole, 3...
... Stop part, 4 ... Actuator, 5 ... Axis, 6
...Sensor, 7...Rebound prevention member, 8...
Conveyance roll, 10... Paper.

Claims (1)

[Claims for Utility Model Registration] A utility model that is supported via a fulcrum placed at the top of a paper conveyance path, is swingably provided in a hole provided in a guide plate of the paper conveyance path, and is swung by the paper. It is composed of an actuator that is configured to return to its original position later by its own weight, and a sensor that is placed at the bottom of the conveyance path and whose optical path is blocked by the actuator, and when the actuator moves within the conveyance path. In the device configured to detect the paper by swinging the paper and releasing the optical path of the sensor, a hole is provided in the guide plate of the conveyance path and allows the actuator to swing. The paper detection device is characterized in that an upstream edge of the paper in the moving direction is formed obliquely with respect to the return direction of the actuator, and the actuator is brought into contact with an inclined surface of the edge of the hole and stopped. .