JPH069281Y2 - Positionable detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a positionable detection device, and more particularly to the structure of a detection device most suitable for detecting printed matter.

(Technical background of the invention and its problems) In general, it is difficult to detect defects that appear in spots when printing at high speed. For this reason, the machine is stopped at the beginning or the end of the winding, and only a very small part of the visual inspection is performed. However, since it is not 100% inspection, defective products may be mixed inside, often causing problems.

As such a printed matter detection device, two sets of light-receiving surfaces of color sensor elements which receive visible light, separate it into red, green, and blue, and generate corresponding output voltages are arranged in a horizontal row. A detection unit is used, one of the units is arranged in the width direction perpendicular to the sheet flow direction before winding of the printed matter, and the other of the detection units is arranged in the sheet flow direction.
The color sensor elements are shifted by a pitch or several pitches and arranged so as to correspond to each other in the sheet flow direction, and the reflected light from the printed matter is received by two sets of detection units and the two sets of detection units correspond to each other. There is a device that detects a defect in a printed matter by calculating a difference voltage for red, green and blue of a color sensor element and comparing the difference voltage with a preset set voltage. FIG. 5 (A) shows the relationship between the printed matter and the detection unit. The detection unit box in which the sheet 2 before winding the printed matter and the detection unit 1 are housed in a box and the light receiving surface faces the sheet 2 3A
And 3B and a control box 4 having a mechanism for receiving and controlling the detection signals from the detection unit boxes 3A and 3B. Then, FIG. 5B shows that the same pattern is continuously printed on the sheet 2 and flows in the direction indicated by the arrow to be output. That is, the areas 2A and 2B are printed on the same pattern. The detection unit boxes 3A and 3B are arranged with an appropriate interval with respect to the sheet 2, and the two detection unit boxes 3A and 3B are placed at positions displaced by one pitch. Therefore, the color sensor elements in these two detection unit boxes 3A and 3B are
They will be placed so that they are right above the parts of the same pattern. That is, in FIG. 5 (B), the color sensor element 5A
And 5B correspond to each other, and are located directly above the same patterns 2A and 2B.

In this way, the two detection unit boxes 3A and 3B are placed at the positions shifted by one pitch or several pitches on the sheet 2, and the difference between them is detected, so that the defect of the printed matter 2 can be detected. .

In this case, it is necessary to arrange the two detection unit boxes 3A and 3B in parallel to the surface of the sheet 2 and detect the pattern under completely the same conditions between the upstream side and the downstream side. For this reason, it is necessary to accurately position the detection sensor units 3A and 3B with respect to the seat 2. Conventionally, the detection sensor units 3A and 3B are moved up and down as a whole by a drive mechanism to position the seat 2 with respect to the surface. I was going to do it. For this reason, there are drawbacks that the inclination with respect to the seat 2 cannot be adjusted and the fine adjustment of the positioning cannot be performed.

(Purpose of Invention) The present invention has been made under the circumstances described above.
An object of the present invention is to provide a detection device that has a simple structure and can perform accurate positioning.

(Summary of the Invention) This invention relates to a positionable detection device.
A pair of sub rolls arranged in parallel with a circular cross section, a supporting member for supporting the whole of the sub rolls, and a detection unit formed by arranging a plurality of detection elements for detecting a pattern or a defect of a printed matter are vertically provided. , A main roll having a circular cross section placed orthogonally on each of the sub-rolls, and an advancing / retreating member for advancing / retreating the supporting member, and enabling each of the sub-rolls to move up and down independently, The detection unit can be swung via the main roll, and the advancing / retreating member can advance / retreat the detection device.

(Embodiment of the Invention) FIG. 1 shows an embodiment of the present invention, in which auxiliary rolls 10 and 11 having circular cross sections are arranged in parallel, and are arranged so as to be orthogonal to the auxiliary rolls 10 and 11. A main roll 20 having a circular cross section is placed. And the main roll 20 has a suspension plate
21 is vertically provided, and the above-mentioned detection unit 22 is continuously provided at the lower end of the suspension plate 21. FIG. 2 shows a front view of such a detection device, and FIG. 3 shows a side view thereof.

In such a structure, the auxiliary rolls 10 and 11 have a circular cross section, and the main roll 20 placed thereon has a circular cross section, so that the main roll 20 has the auxiliary rolls 10 and 11.
As it is tilted up freely, the suspension plate 21 hung vertically on the main roll 20 swings as shown by the broken line in FIG. Therefore, in a steady state, the detection unit 22 is stationary at a position facing the reference surface 30 as indicated by the solid line, and the bottom of the detection unit 22 should be cleaned with a cloth by swinging the suspension plate 21 by hand or the like. Therefore, even if the light receiving surface of the detection unit 22 becomes dirty, its maintenance becomes easy. Further, by allowing the auxiliary rolls 10 and 11 to move up and down independently of each other, it is possible to position the surface of the detection unit 22 connected to the suspension plate 21 at an arbitrary position with respect to the reference surface 30. Becomes

4 (A) and 4 (B) show a specific example of the positioning device shown in FIG. 1. FIG. 4 (A) is a front view and FIG. 4 (B) is FIG.
FIG. 2B is a sectional view taken along the line II in FIG. Reference numeral 100 represents the entire positioning device, 106 is a main roll, and 107 and 107 are sub-rolls. Both ends of the main roll 106 are placed on the sub rolls 107, 107, and the supporting members 108, 108, 10 on which the detection unit A is set.
The upper part of 8 is fitted and fixed. Both ends of the auxiliary roll 107 are fitted and fixed to the roll support member 105, and the roll support member 105
A rod 104 having a threaded portion having a handle 102 fixed to the upper end is rotatably attached to the upper part of the. The threaded portion of the rod 104 engages with the threaded portion of the block 103, and the block 103 is fixed to the bottom end of the channel 101.
Guides 112, 112 having grooves are fixed to the rear surfaces of both ends of the channel 101, and a moving member 116 having a screw portion is fixed to the rear surface of the bottom of the central portion. A pair of angles 115, 115 are provided along the longitudinal direction of the channel 101, and both ends of the angles 115, 115 are fixed to channels 110, 110 provided at right angles to the angle 115. The channels 110, 110 are not shown in the frame of a printing machine (not shown). ) Is fixed. Fixed blocks 114 and 114 having through holes are fixed to the central portions of the upper surfaces of the angles 115 and 115, and a lead screw having a handle 113 fixed to one end is rotatably held by the fixed blocks 114 and 114, and the lead screw 117
Engages with the threaded portion of the moving member 116. Channel 11
Square members 111, 111 are fixed to the upper surface of 0, 110 in the longitudinal direction, and the square members 111, 111 are slidably fitted to guides 112, 112 provided at both ends of the channel 101. Therefore, by rotating the handle 113, the channel 1
01 moves back and forth along the longitudinal direction of the channel 110, and the roll support members 105 and 105 supported by the rods 104 and 104, the main roll 106, and the detection units set on the support members 108, 108 and 108 move forward and backward as a unit. Reference numerals 120, 120, 120 and 120 denote guide rolls rotatably held by a printing machine frame (not shown), and W denotes a printed matter running along the guide rolls.

Further, when the detection unit is set on the positioning device to detect a defect of the printed matter, two positioning devices 100 are appropriately attached to the printer frame. In this case, the detection unit set in one positioning device corresponds to the detection unit 3A shown in FIG. 5, and the detection unit set in the other positioning device corresponds to the detection unit 3B in FIG.

Next, the operation of the positioning device 100 will be described. First, by rotating the handle 102, the rod 104 fixed to the handle 102 moves up and down, and the roll support member 105 moves up and down. Since both ends of the main roll 106 are simply placed on the sub-rolls 107, 107, only one side of the main roll moves up and down, and only one side of the detection unit A set on the supporting members 108, 108, 108 is printed. Back and forth, therefore, by alternately rotating the handles 102, 102,
Positioning is performed so that the gap between the detection unit A and the printed matter W is constant. After that, both ends of the main roll 107 are fixed by stoppers (not shown) to fix the position of the detection unit A.

Next, the handle 113 is rotated to move the moving member 116 engaged with the lead screw 117. As a result, the channel 101 moves in the longitudinal direction of the channels 110, 110, and the rods 104, 104, the roll supporting members 105, 105, the main roll 106,
The support members 108, 108, 108 move as a unit, and the support member 1
The detection unit A set in 08, 108, 108 moves forward and backward in the traveling direction of the printed matter, and the detection unit A is moved in the traveling direction of the printed matter.

(Effects of the Invention) As described above, according to the detection device of the present invention, the main roll having a circular cross section is placed on the sub roll having a circular cross section, and the sub roll is vertically moved through the suspension plate on the main roll. By advancing and retracting the detecting device by the advancing and retracting member, the detecting unit device can be accurately positioned at an arbitrary position. Further, since the detection unit can be swung, maintenance of the detection unit becomes easy.

[Brief description of drawings]

1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a front view thereof, FIG. 3 is a side view thereof, and FIGS. 4 (A) and 4 (B) are side views showing a concrete example of the present invention. 5 and FIG. 5, FIG. 5 (A) is a diagram showing an example of a printed matter detection apparatus to which the present invention can be applied, and FIG. 5 (B) is a diagram for explaining the detection principle. 2 ... Sheet, 3A, 3B ... Detection unit, 4 ... Control device, 10,
11 ... Secondary roll, 20 ... Main roll, 21 ... Suspension plate, 22 ... Detection unit, 30 ... Reference plane.

Claims (1)

[Scope of utility model registration request] 1. A pair of parallel-arranged sub-rolls each having a circular cross section, a support member for supporting the whole of the sub-rolls, and a plurality of detection elements for detecting a pattern or a defect of a printed matter. The detection unit is provided vertically, and is composed of a main roll having a circular cross section placed orthogonally on each of the sub rolls, and an advancing / retreating member for advancing / retreating the support member, and vertically moving each of the sub rolls independently. A positionable detection device, characterized in that the detection part can be swung via the main roll, and the detection device can be advanced and retracted by the advancing and retracting member.