JPS63261103A - Shape measuring device for logs, etc. - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Objective of the Invention) <Industrial Application Field> The present invention relates to a device for automatically measuring the outer diameter of raw wood, etc. The present invention relates to a shape measuring device that performs continuous precise measurement in all directions.

<Prior art> Conventionally, the log to be inspected is transported to pass through a measuring section, and then a phototube is used to project the log to detect its shadow range and determine the outside diameter of the log. . However, in the past, the measurement medium was a normal light beam from a phototube, so the light beam spread, and due to this, measures were taken to prevent mutual interference from occurring in light beam tubes that tend to spread.
Even if attempts were made to narrow the beam spacing in order to avoid this, there was a natural limit, which hindered accurate measurement. Of course, it is possible to reduce the spread of the luminous flux by bringing the emitter and receiver closer to each other, but this kind of work environment is relatively prone to dust, and it is difficult to move the measuring element away from the log transport track. It would be desirable to do so, but there would naturally be a limit to the narrowing of the interval between the luminous fluxes. Due to these various constraints, conventionally the beam interval has been set to a minimum of Ion.
I could only narrow it down to a certain extent. For this reason, for example, an error of about 1011 may occur at both outer diameter ends of the log, and a maximum diameter measurement error of nearly 20 m may occur, making it difficult to expect accurate measurement results.

Technical matters that were attempted to be developed> The present invention has been made in view of the problems of the prior art, and it provides a new shape that allows for more accurate measurement when determining the outer diameter of logs, etc. This is an attempt to develop a measuring device.

(Structure of the Invention) Means for Achieving the Object> That is, the device for measuring the shape of logs, etc., which is the present invention, includes a projector that outputs a laser beam with the object to be inspected sandwiched between the objects to be inspected, in the middle of the transportation trajectory of the object to be inspected. , and a light receiver thereof, thereby achieving the above object.

<Examples> The present invention will be specifically described below based on illustrated examples. Reference numeral 1 denotes a shape measuring device according to the present invention, and a transporting device 2 for transporting an object to be inspected A, such as a log, is used.
Attached. First, the shape measuring device 1 will be described. This device has a gate-like frame 5 with an opening in the center, and serves as a measuring section 6 through which the object A to be inspected passes.

The gate-like frame 5 is provided with three pairs of projectors 7 and receivers 8, which project two systems of laser beams diagonally in the vertical direction, and further in the horizontal direction. Three projection ranges are set so that one system of laser light is projected onto the target area. To outline the structure of the light projector 7 and the light receiver 8, first, reference numeral 10 is a drive power supply circuit on the light projecting side.
Supply a power supply of 0 volts and step down the voltage accordingly, for example, 5 volts.
The drive output will be approximately 3 volts and 3 amperes. For example, six laser projecting elements 11 are connected to this driving power source, and a branching lens 12 is arranged in front of each laser projecting element so as to cover the entire projection range.

An acrylic Fresnel lens or the like is applied to this branching lens 12, and a plano-convex lens is used.
Moreover, the convex surface side has a large number of concentric grooves formed thereon. A filter 14 is first provided on one of the light receivers 8, and a focusing lens 15 is further provided inside this filter 14. This uses a cylindrical lens that is like a cylindrical lens divided in half.

A light receiving element 16 is provided at the back of this focusing lens 15. This light-receiving element 16 is mainly composed of a so-called phototransistor or the like that detects the laser beam and generates a predetermined electrical output. It is attached. Incidentally, considering that in the case of a conventional phototube, the beam interval was at least 10 m, an extremely precise light reception interval was obtained. The output from this light receiving element 16 is connected to the parallel/direct conversion board 19 via the connector 18, and the connector 18 and the parallel/direct conversion board F
A light-receiving side drive power supply circuit 20 is supplied to j, 19. This light receiving side drive power supply circuit 20 is also the same as the light emitting side drive power supply circuit 1.
Almost the same as 0, AC 100 volts is used as a power source, and this is stepped down to about 5 volts and 5 amperes to be used as a driving power source. The parallel/direct converter board 19 integrates the output of the light receiving element 16 and outputs it as a serial output, and this output is sent from the serial output circuit 21 to the arithmetic device 22 and the display device 23.

The shape measuring device of the present invention has the configuration described above, and further includes a transporting device 2 for the object A to be inspected.
is attached. Regarding this, reference numeral 25 is a conveyor frame which is a skeleton member of the transfer device 2,
This conveyor frame 25 passes through the inspection section 6 of the gate-like frame 5 and is formed in series from the front and back thereof. Turn pulleys 26 are provided at both ends of the conveyor frame 25, and at least one of them is driven to operate the transfer device 2. As an example, the turnboo IJ26 has a conveyor base material 2 consisting of a heddle.
7 is suspended, and the conveyor base material 27 is provided with a number of support plates 28 that support the object to be inspected A in a floating state from the conveyor base material 27 for a certain period of time. The support plate 28 is, for example, recessed in its center to form a support portion 29 for positioning the object A to be inspected. Furthermore, a butt end inspection device 31 is attached to the transfer device 2 in this embodiment. This is for inspecting the condition of, for example, the ends of the raw wood that is the object to be inspected A, and a roller conveyor 3 is installed on the extension line of the discharge side of the transfer device 2.
2 is provided, and a roller conveyor 33 of the same structure is further provided next to it. A television camera 34 is installed at the tip of the roller conveyor 32, which photographs the end of the wood and transmits it onto a cathode ray tube so that an operator can visually inspect the state of the end of the wood. The roller conveyor 33 is configured to inspect the other end of the wood, and a television camera 35 for inspecting the other end of the wood is provided on the end surface of the roller conveyor 33 on the transfer device 2 side. A discharge conveyor 36 is located further to the side of these roller conveyors 32 and 33.
These are connected by a chain conveyor 37 disposed orthogonally.

The apparatus for measuring the shape of logs, etc., which is the present invention, is incorporated into the apparatus described above, and performs shape inspection in the following manner. First, a log or the like that is the object to be inspected A is placed on the transfer device 2, and then the transfer device 2 is driven to
is passed through the measuring section 6 in the shape measuring device 1. In such a case, a set of a light emitter 7 and a light receiver 8 provided around the inspection section 6 emits and receives laser beams so as to project the side torso of the object A to be inspected. The area where the projection was obstructed was measured and the torso dimensions were determined. At this time, in this embodiment, the object to be inspected A to be transferred by the transfer device 2 is transferred in a state of being lifted high by the support plate 28, and the transfer device 2 also passes through the inspection section 6 and is integrated into one body. Since the trajectory is set, there is no shaking of the object to be measured A when passing through the inspection section 6, and the projected laser beam can completely cover the object to be tested A without any hindrance. Projected in an enclosed state. Of course, the timing setting is such that the emission timing of the laser beam is performed between the support plates 28 so as not to be hindered by the support plates 28. The measurement results measured in this manner are subjected to arithmetic processing, for example, by the arithmetic unit 22, and are displayed on the display device 2 as appropriate.
3, and further sent as data to other necessary processing devices.

After undergoing such shape inspection, the object to be inspected A is sent from the transfer device 2 to the end inspection device 31 side in this embodiment, and one end of the end is visually inspected by a television camera 34 on a mass roller conveyor 32. It is inspected, and then sent onto the adjacent roller conveyor 33 by the chain conveyor 37, and the end of another test object A is visually inspected by the television camera 35. After the end of the wood has been inspected, it is discharged to the outside by the discharge conveyor 36.

(Effects of the Invention) As described above, according to the present invention, when inspecting the shape of logs, etc., a laser beam is used as the inspection medium, so that the inspection light beams can be arranged densely. In addition, since the light beam itself has extremely high straightness, it is possible to perform more accurate measurements. In the case of this type of laser beam, there is almost no attenuation of the luminous flux even if the distance between the emitter and the receiver is relatively large, so the laser beam can be used even if the distance between the emitter and the receiver is relatively large. It can be set separately, and it is possible to prevent staining of the measuring elements, etc., and stable measurement can be expected at all times.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the present invention, Fig. 2 is a top view of the same, Fig. 3 is a side view of the same, Fig. 4 is Fig. 3 IV-
FIG. 5, which is a longitudinal sectional front view along line IV, is a block diagram showing the shape inspection method. 1; Shape measuring device 2; Transfer device 5; Gate-shaped frame 6; Inspection section 7; Emitter 8; Focusing lens 16; light receiving element 17; board 18; connector 19; parallel/direct converter board 20; light receiving side drive power supply circuit 21; serial output circuit 22; arithmetic unit 23; display device 25; conveyor frame 26; turn pulley 27; conveyor Base material 28; Support plate 29; Support part 31; End inspection device 32, 33; Roller conveyor 34, 35; Television camera 36; Discharge conveyor 37; Chain conveyor A; Test object

Claims (1)

[Claims] 1. An apparatus for measuring the shape of logs, etc., characterized in that at least one pair of a light projector and a light receiver for outputting a laser beam are provided in the middle of the transport trajectory of the object to be inspected, sandwiching the object to be inspected.