JPH0646363U - Optical sensor head - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an optical sensor head capable of reading a stable image without being affected by the running state of the web and being installed at a place not limited to the vicinity of a feed roller, an impression cylinder, a blanket cylinder, or the like. An optical sensor (4), a housing (1) for the optical sensor, and at least a pair of rollers (2) supported by the housing and in parallel contact with a material to be printed,
An optical sensor head, wherein a roller position is set such that a distance between the printing medium and the optical sensor is equal to a focal length of the optical sensor.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an optical sensor head used for quality control and inspection of images formed by various printing machines and printers.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, an optical reading sensor has been used to automatically detect a printing defect of a printed matter printed by various printing machines and printers. When the reading sensor is a contact type, the reading sensor is brought into contact with the paper to inspect the printed image, but it was necessary to stop the inspection object. It is also known to incorporate a non-contact type reading sensor into the printing line of the printing material to detect printing defects while printing, but since the printing material such as paper or film is difficult to maintain a flat surface, There is a drawback in that the focal length of the optical sensor is displaced due to distortion of the material to be printed and stable reading becomes difficult.

Further, as shown in FIG. 6, in the case of online quality control / inspection of a printed matter printed on a paper web 21 by an offset rotary printing machine, the reading sensor 11 uses a feed roller 21, an impression cylinder 23, However, there is a drawback in that it is limited to a place near the blanket cylinder 24, etc., where it is difficult to install the image stably. In such a printing machine, there is often little space near the roller, and wiring materials, electrical products, motors, etc. are often installed, making it difficult to install sensors that require a certain distance space.

[0004]

[Problems to be solved by the device]

 The present invention provides an optical sensor head that can read a stable image without being affected by the running state of the web and is not limited to the installation location near the feed roller, the impression cylinder, the blanket cylinder, or the like.

[0005]

The present invention comprises an optical sensor, a housing for the optical sensor, and at least one pair of rollers supported by the housing and in parallel contact with a material to be printed, The present invention relates to an optical sensor head, characterized in that the roller position is set so that the distance between the printing medium and the optical sensor is equal to the focal length of the optical sensor.

The present invention will be described with reference to the drawings. The optical sensor head 10 includes a sensor housing 1, a roller 2, and an optical sensor 4. The optical sensor 4 may be a line type or a camera type. The roller 2 is supported by a roller support 3 fixed to the container 1. In the roller support 3, the distance between the material to be printed 21 and the optical sensor 4 is equal to the focal length of the optical sensor 4. Light sources 5 are arranged on both sides of the optical sensor 4, but the light source 5 is not necessary in some cases. The optical sensor head 10 can be installed at any place on the printing line, and contacts the printing material 21 running on the roller 2 so as to be perpendicular to the running direction of the running web. Let me use it. The optical sensor head of the present invention can be used in a printing paper surface inspection device that is incorporated in a printing line, analyzes read information by a data analysis computer 25, and displays the status on a monitor screen 26.

[0007]

[Effect of device]

 ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to read a stable image and it is possible to provide an optical sensor head whose installation location is not limited to the vicinity of a feed roller, an impression cylinder, a blanket cylinder, or the like. It also eliminates the need for sensor focusing and angle adjustment. In addition, since the roller also functions as a light shield, it is not affected by external light. Therefore, according to the optical sensor head of the present invention, wrinkles and distortion of the printing web can be eliminated and stable image reading can be performed.

[0008]

[Brief description of drawings]

FIG. 1 is a perspective view.

[Figure 2] Side view

FIG. 3 is a plan view.

FIG. 4 is an explanatory sectional view showing how to use the device of the present invention.

FIG. 5 is an explanatory sectional view showing how to use the device of the present invention.

FIG. 6 is an explanatory sectional view showing how to use a conventional optical sensor.

[0009]

[Explanation of symbols]

 1 ... Container 2 ... Roller 3 ... Roller Support 4 ... Optical Sensor 10 ... Optical Sensor Head

Claims (1)

[Scope of utility model registration request] 1. An optical sensor, an accommodating body for the optical sensor, and at least a pair of rollers supported by the accommodating body and in parallel contact with the printing medium. An optical sensor head, wherein a roller position is set such that a distance between the sensors is equal to a focal length of the optical sensor.