JPS60162240A - Original size detecting of copying machine - Google Patents

Abstract

PURPOSE:To detect automatically an original size by burying plural infrared ray- reflective sensors on the glass-size face of a cover, which retains a originals on a platen glass of a copying machine, through an infrared ray-transmissive film. CONSTITUTION:An original 3 is placed on a platen glass 2. Plural infrared ray- reflective sensors 4 are buried in prescribed position of a platen cover 1 as shown by (1)-(6) in the figure, and an infrared ray-transmissive film 6 is inserted between the original 3 and sensors 4. With respect to each infrared ray- reflective sensor 4, a light emitting part 4a and a light receiving part 4b are provided in a recessed part 5, which is provided in the platen cover 1, through a spacer 7. The reflected light is inputted to light receiving parts 4b in the area where the original 3 exists, but the reflected light is not inputted in the area where the original 3 does not exist. An original size A3, A4, B3, or B4 is discriminated automatically by combination of presence/absence of the reflected light of sensors (1)-(6). Thus, the copying work is automatized to prevent failures due to manual operations, and the work is performed efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a document size detection device for a copying machine, and more specifically, the present invention relates to a document size detection device for a copying machine. The present invention relates to a copying machine that develops, transfers, and fixes the latent image, and a document size detection device that detects the document size with an infrared reflective sensor attached to a platen cover.

[Prior art]

2. Description of the Related Art With the recent information society, copying machines are required to have multiple functions and rapid processing capabilities. In response to this, copying machines equipped with paper that can accommodate various document sizes have been developed, but in order to give these copying machines even faster processing capabilities, it is necessary to equip them with a document size detection device. .

However, the only document size detection devices currently in use are those that use a color sensor and those that have an automatic document feeder with a detection function. Since the document size cannot be detected without scanning, it lacks operability, and the latter, in which the automatic document feeder has a detection function, cannot be applied to copying machines that do not have an automatic document feeder. The problem was that it lacked versatility.

Therefore, in order to make the copying machine more multi-functional and to increase its processing capacity quickly, there is a desire for a copying machine that has a function of quickly and accurately detecting the document size and transmitting the detected document size to other operating units.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and its purpose is to instantly detect the size of a document placed on a platen glass, and to detect the size of a document placed on a platen glass so that other operating parts of a copying machine, such as a paper feeder, can It is an object of the present invention to provide a document size detection device for a copying machine, which is characterized by being able to speed up copying work and increase the number of functions by transmitting information to the document size.

[Structure of the invention]

That is, the gist of the present invention is to provide a copying machine that exposes a document placed on a platen glass to light using an imaging optical system, and develops, transfers, and fixes the latent image. An infrared transmitting film is attached to the side of the platen glass, and an infrared reflective sensor is attached to the side of the platen cover of the infrared transmitting film with a spacer interposed.The sensor detects the light reflected by the document. The present invention relates to a document size detection device for a copying machine, which is characterized by detecting the document size.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is an enlarged cross-sectional view showing the structure of the document size detection device of the present invention, in which (1) is a platen cover and shows a document (3) placed on the platen glass (2). It covers the upper surface of the original (3) when it is exposed using an imaging optical system that does not cover the original, and is made of a highly elastic member such as a sponge. An infrared reflective sensor (
Recesses (5) are provided for installing the senna (4) in a buried manner, and the senna (4) disposed within these recesses (5) is provided.
4) is composed of a light emitting part (4a) and a light receiving part (4b), and a spacer (7) is provided between the infrared transmitting film (6) attached to the side surface of the platen glass of the platen cover (1). is attached to the document (3) to ensure a detection distance at which maximum sensitivity is achieved. In this case, since the characteristics of the sensor (4) are represented by the curve shown in FIG. 2, the maximum sensitivity of the sensor (4) can be obtained by setting the detection distance to C.

Note that, as the infrared transmitting film (6), for example, white Borien ether film is used.

Next, to explain the mounting position of the sensor (4), the document sizes that can be copied are B5, A4, B4 and A.
In the case of 6 types of document sizes, 8 (horizontal), B5, and A4 (vertical), as shown in Fig. 8, the sensor ( 4), the size of the original can be detected by detecting the reflected light from the original (3) with the sensor (4) at each position. After detecting the document size, the detection signal is transmitted to a paper feeding device (not shown) to feed paper corresponding to the document size.

Note that in order to detect the six types of document sizes mentioned above, it is not necessarily necessary to use six sensors (4), but by attaching the sensors (4) at the shaded positions shown in FIG.
Various document sizes can be similarly detected by a combination of four sensors (4). That is, by attaching sensors ■ and ■ to the horizontal edge positions of B5 and B4, respectively, and attaching sensors ■ and ■ to the vertical edge positions of A4 in the horizontal position and the vertical edge position of A4, each document size can be adjusted. It can be detected as shown in the combination table shown in FIG.

In the document size detection device of the present invention configured as described above, the document placed on the platen plus (2) (
3) When detecting the size of the infrared transmitting film (
6) is in close contact with the top surface of the document (3), there is no reflection of infrared rays on the film surface, and the sensor (4)
Since the original (3) was mounted at an optimal detection distance, the sensor reacted more sharply to the light reflected from the original (3) surface, and was able to obtain a high Q ratio.

〔Effect of the invention〕

As described above, according to the document size checking device of the present invention, an infrared transmitting film is attached to the side surface of the platen glass of the platen cover, and a spacer is interposed on the side surface of the platen cover of the infrared transmitting film. Since it is equipped with an infrared reflective sensor, the sensor can instantly detect the reflected light from the document placed on the platen glass, and by transmitting the detection signal to the paper feeder, the copying machine can be activated. It is possible to enhance multi-functionality and improve processing capacity. In addition, since the sensor is protected by an infrared-transmissive film, there is no risk of its functionality decreasing due to damage or adhesion of dust, etc., and excellent effects such as being able to maintain the desired functionality over a long period of time can be achieved. Therefore, its utility value is remarkable.

[Brief explanation of the drawing]

FIG. 1 is an enlarged cross-sectional view showing the mounting structure of the document size detection device of the present invention, FIG. 2 is a characteristic curve diagram of the infrared reflective sensor of the present invention, and FIGS. 8 and 4 are infrared reflective type sensors, respectively. The sensor mounting shown in Fig. 4 is an explanatory diagram showing the position. Fig. 5 is an explanatory diagram showing the position of the sensor mounting shown in Fig. 4. (2)・・・・・・
・Platen glass (3)...Original (4)...
...Infrared reflective sensor (4a)...Emitting part (4b)...Receiving part (5)...Recess (6)... Infrared transmitting film (7)...
...Spacer patent applicant Fuji Xerox Co., Ltd. Agent Tomohiro Nakamura Patent attorney Katsuo Naruse Figure 1 Figure 2 '#clf] Spacing (mm) Figure 3 Figure 4 Figure 5 χ Hara 1 heat

Claims (1)

[Claims] In a copying machine that exposes a document placed on a platen glass to light using an imaging optical system, and develops, transfers and fixes the latent image, the platen glass side surface 62 of the platen cover that covers the platen glass is covered with an infrared transmitting film. At the same time, an infrared reflective sensor is attached to the side surface of the platen cover of the infrared transmitting film with a spacer interposed therebetween, and the sensor detects light reflected by the original to detect the original size. The machine's document size detection device.