JPH04102847U - Displacement sensor type 2 sheet difference detector - Google Patents

Abstract

(57) [Summary] [Purpose] A two-sheet difference detector for sheet-fed offset printing machines detects the difference without being affected by minute paper misalignment or ink on the paper surface, and also detects changes in paper thickness. To make it easy to adjust the situation. [Structure] A detection unit 17 of a displacement sensor type two-sheet difference detector is integrally provided on the swinging body 9 of the horizontal needle device 6 of a sheet-fed offset printing machine, and the upper roller 11 swings together with the swinging body 9 to detect the paper 1. When the paper pad 13 is brought into contact with and aligned, the lever 19 and the metal piece 20 swing, and the displacement sensor 23 measures the amount of displacement. A meter relay is connected to the displacement sensor 23, and the meter relay compares the minimum value measured by the displacement sensor 23 with a reference value, and if the difference exceeds the allowable value, it is determined that there is a difference between two sheets. generates an abnormal signal.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention is a displacement sensor used, for example, in the paper supply section of a sheet-fed offset printing machine. This article relates to a sensor-type two-sheet difference detector.

0002

[Conventional technology]

In printing machines such as sheet-fed offset printing machines, the paper is Because it is necessary to feed paper sheets one by one, a two-sheet difference detector is usually installed in the paper supply section. I'm being kicked. Conventionally, as this type of detector, for example, Japanese Patent Application Laid-Open No. 62-11644 As described in Publication No. 2, light is used to irradiate light onto paper and detect the transmitted light. Electric type or capacitive type that measures the capacitance of paper to detect the number of sheets of paper. etc. are commonly used. Such a detector is used in sheet-fed paper feeding devices. It is usually provided near the front pawl at the tip of the paper insert plate.

0003

[Problem that the idea aims to solve]

However, the conventional two-sheet difference detector described above detects uneven paper making, paper texture, or It is said that it is unable to respond to slight misalignment of multiple sheets of paper that are continuously fed. There are problems, especially with transmission type photoelectric detectors, which are configured to detect blank areas of paper. Because of this, it cannot be detected with paper or thick paper that does not transmit light, Even when performing double-sided printing, the ink on the back side of the paper may affect the detection and make it undetectable. There was a problem with putting it away. In addition, in the conventional detector described above, the thickness of the paper being supplied is There was also a problem in that it was troublesome to make adjustments when the height changed.

0004 The present invention was developed in view of the above problems, and is intended to prevent slight paper misalignment and It is not affected by the type of paper, the ink on the paper surface, etc., and the thickness of the paper changes. The purpose is to obtain a two-sheet difference detector that can be easily adjusted when .

[0005]

[Means to solve the problem]

The displacement sensor type two-sheet difference detector according to the present invention is an upper part of the horizontal needle device in a sheet-fed machine. a displacement sensor that measures the amount of displacement of (b); A meter relay that compares the minimum value measured by the sensor with a preset reference value. It is characterized by having:

[0006]

[Effect]

A permissible value is set in the meter relay using the amount of displacement for one sheet of paper as a reference value. Then, during the horizontal needle operation by the horizontal needle device, the displacement amount of the upper roller of the device is detected by the displacement sensor. Therefore, if the difference between the minimum value of this measurement value and the reference value exceeds the tolerance value, 2 It is determined that there is a sheet difference and an abnormal signal is issued.

[0007]

【Example】

Examples will be described below based on the drawings.

[0008] Figure 1 shows the main structure of the paper feed section of a sheet-fed offset printing machine according to an embodiment of the present invention. 2 is a plan view of the horizontal staple device in the paper feed section, and FIG. 3 is a side view of the device. be.

[0009] In this embodiment, the paper feed section of the sheet-fed offset printing machine includes a sheet of paper to be printed. A paper feed pile 2 on which a large number of sheets are stacked, and a paper feed head disposed above the paper feed pile 2. 3 and transports the paper 1 separated one by one from above the paper group on the paper feed pile 2. The conveyor belt 4 and the paper insert plate (see figure) installed downstream of the belt conveyor 4 Not shown. ), and a plurality of front claws provided at the tip of the paper insert plate to align the front edge of the paper 1. 5, and a horizontal stitching device 6 provided on the side of the paper insert plate for aligning the side edges of the sheets 1. ing. Note that the horizontal needle device 6 is provided one each on the left and right sides of the paper insert plate. (Only the left side is shown in FIG. 1), and each side needle device 6 is connected to the surface of the paper 1 and Used when printing the front and back sides.

0010 The main body of the horizontal needle device 6 has a well-known structure, and has a base body. 7, a rocking body 9 that can swing with respect to the base body 7 by a support shaft 8, and the rocking body 9 an arm 10 integrally provided in front of the arm 10, and an upper arm rotatably supported at the tip of the arm 10 The roller 11 is provided integrally with the oscillating body 9 and is positioned opposite the upper roller 11. A paper press plate 12 having holes, a paper pad 13 fixed to the front part of the base 7, and an upper roller 1 A lower roller 14 provided at a position facing downwardly of the rocker 1 and driven to rotate, and an upper roller 14 of the rocking body 9 and An adjustment bolt 15 and a spring bar 16 are provided at the front and rear sides, respectively.

[0011] In the horizontal needle device 6 having such a configuration, the upper roller 11 is moved by the swinging of the swinging body 9. When the paper is in the upper position, the paper 1 transferred from the direction perpendicular to the plane of the paper in FIG. When it comes into contact with the stopper claw 5 and is stopped, as the rocking body 9 swings, the paper presser plate 12 and When the upper roller 11 is swung downward and the upper surface of the paper 1 is pressed by the paper press plate 12, In both cases, the paper 1 is sandwiched between the upper roller 11 and the lower roller 14. At this time, lower Since the rollers 14 are constantly driven, the paper 1 is rotated by the upper rollers 11 and the lower rollers 14. It is pulled in the direction of the paper pad 13 by rolling, and its side edge is brought into contact with the paper pad 13 and aligned. available. Note that the amount by which the paper 1 is pulled by this horizontal needle device 6 is usually about 7 mm. be.

0012 The horizontal needle device 6 is provided with a detection section 17 that constitutes a part of a two-sheet difference detector. There is. This detection section 17 is an L-shaped detector integrally fixed to the side surface of the oscillating body 9 of the horizontal needle device 6. A bracket 18 and a cross needle device 6 integrally provided on the lower surface of the end of the bracket 18. A lever 19 extending toward the rear, and a metal plate fixed to the bottom surface of the tip of the lever 19. It is equipped with a metal piece 20, and each of these members rotates integrally with the oscillator 9 with the support shaft 8 as a fulcrum. be swayed. Further, an L-shaped support 21 is provided on the base 7, and this support 21 On the upper surface, there is an eddy current displacement sensor that faces the metal piece 20 with a support plate 22 in between. A sensor 23 is provided.

[0013] Each displacement sensor 23 attached to each of the left and right horizontal needle devices 6 (pulling needle and poking needle) is As shown in FIG. 4, it is connected to a digital switch type meter relay 24. This meter relay 24 is connected to the horizontal needle device 6 measured by the displacement sensor 23. The difference between the minimum displacement amount of the upper roller 11 during horizontal needle movement and the reference value (rotation angle of the upper roller 11) A display that holds and displays the comparison value at the lowest point position between 315° and 355°. A section 25 is provided, and the reference value and tolerance value are digitally calculated based on various measurement conditions. A setting section 26 for setting is connected thereto.

[0014] Next, the operation of the two-sheet difference detector having the above configuration will be explained.

[0015] First, set the reference value (zero set) when the printing machine's paper counter turns on. ) and a value smaller than the thickness of paper 1 to be supplied (for example, 1/1 of the paper thickness). The value of 2 is 0.05 mm for thin paper and 0.10 mm for thick paper). The setting unit 26 of the meter relay 24 sets the permissible value. In addition, Figure 5 ( Arrow A in b) indicates zero set.

[0016] When the paper 1 is transferred to the position of the horizontal needle device 6, the horizontal needle movement is caused by the swinging of the upper roller 11. The work is done. At that time, the amount of displacement of the upper roller 11 is determined by the vertical movement of the metal piece 20. Measured by sensor 23. The measured value by this displacement sensor 23 is shown in FIG. ), the meter relay 24 is horizontally operated by the upper roller 11. The lowest point position when the rotation angle is between 315° and 355° (indicated by the arrow in Figure 5(a)) is compared with the reference value and the comparison value is held, so paper feeding is performed normally. In this case, the solid line in Figure 5(b) cannot exceed the allowable value (set value) indicated by the broken line. Therefore, the value displayed on the display section 25 is approximately 0.

[0017] However, the tolerance value (setting value) set in the meter relay 24 was exceeded. When a paper of a paper thickness of As shown by arrow B in Figure 5(b), the difference between the above measured value and the reference value is equal to the set value. As a result, a detection signal for the difference between two sheets is output.

[0018] If a difference between two sheets is detected in this way, an alarm and notification lamp will notify you. At the same time, the paper feeding device is stopped. Note that even if you stop the paper feeder in this way, If the front stopper claw 5 is not able to stop the paper 1 in time, the paper 1 is transferred to a delivery device located downstream of the printing machine. It is discharged to the upper stage of the tank. Also, when restarting after an abnormal signal occurs, the meter relay By pressing the reset button -24, zero setting is performed again.

[0019] In this embodiment, the difference between the measured value by the displacement sensor 23 and the reference value is the hold value. The measurement status is always displayed digitally on the display section 25 of the meter relay 24. can be checked at all times.

[0020]

[Effect of the idea]

As described above, according to the present invention, the displacement amount of the upper roller of the cross needle device is measured by the displacement sensor. The difference between the two sheets is detected by measuring the amount of displacement and comparing it with the reference value. This makes it easy to make adjustments when the thickness of the paper changes, and also makes it easy to adjust the It is not affected by paper misalignment or ink on the paper surface. Also, the horizontal needle device Since the minimum value is held while the roller is holding the paper, the mechanical system It is not affected by backlash or uneven paper thickness.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the main structure of a paper feed section of a sheet-fed offset printing machine according to an embodiment of the present invention.

[Figure 2] Figure 2 is a plan view of the horizontal needle device in the paper feed section.

[Figure 3] Side view of the device

[Figure 4] Equipment configuration diagram of the two-sheet difference detector in the same example

[Figure 5] Diagram explaining the detection operation by the detector

[Explanation of symbols]

1 Paper 6 Horizontal needle device 11 Upper part 17 Detection part 23 Displacement sensor 24 Meter relay

Claims (1)

[Scope of utility model registration request] 1. A displacement sensor that measures the amount of displacement of an upper roller of a horizontal needle device in a sheet-fed machine, and a displacement sensor that is connected to the displacement sensor and that sets a minimum value of the measured value by the displacement sensor and a preset reference value. A displacement sensor type two-sheet difference detector characterized by being equipped with a meter relay for comparison.