JPH01502412A - How to measure the distance of a hand-held machine tool from the workpiece - 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] Conventional technology for measuring the distance of a hand-held machine tool from a workpiece The present invention relates to a method for measuring the distance of a hand-held machine tool from a workpiece as set forth in claim 1. related. Parallel to the axis of the Federal Republic of Germany, a profile made of synthetic resin or metal Drilling machines for measuring the depth of drilled holes are known.

can. Tighten the thumbscrew until the front top of the pulper is set. When it reaches the depth of the drilled hole, it contacts the workpiece. The disadvantage of this measurement method is that the profile The protrusion of the lever and therefore the depth of the drilled hole, given in advance, The problem is that it cannot be set accurately because it is measured visually. Tighten the thumbscrew. During fastening, the Zorofil bar may slide undesirably in the longitudinal direction. However, There is a risk of over-drilling the workpiece.

The advantage of the method of the invention is that distance measurements can be made with high measurement accuracy. . For this purpose, known triangulation methods are used. In this case, the light source is an optical pattern. The beam is projected onto the surface of the workpiece, and the beam reflected from the surface is imaged on a photodetector.

The position of the optical pattern imaged by the light receiving device is determined by the distance of the workpiece from the hand-held machine tool. It becomes a measure.

Advantageous embodiments are described in the Embodiments section.

In a signal processing device comprising an input device and an optical and acoustic output device , distance information is processed in a subsequent frame. If the manual machine tool is a drilling machine, use a drill. The depth of the hole drilled can be determined.

Advantageously, the actual depth of the hole is determined during the drilling operation via the input device. continuously displayed on the display device of the signal processing device. Display device when starting drilling A value of 7 to 0 is suitable. Even without such a zero setting, the actual value and It is possible to measure the difference from the target value.

It is further advantageous if the acoustic signal is transmitted via the acoustic output device of the signal processing device to a set target. Send before the target value is reached. Therefore, based on this signal, the hand-held machine tool's feed system is reduce the amount of energy at an appropriate point before reaching the target value so that it does not exceed the target value. It can be done. For example, the display will flash or show that the target value has been approached. This can also be done by switching the displayed color.

Obtaining significant advantages in battery powered equipment by pulsing light sources I can do it. Pulse operation allows high radiant power to be obtained with low average energy. can.

Next, the present invention will be explained in detail based on examples.

drawing The figure shows an optoelectronic circuit device and also shows the connection between the hand-held machine tool and the workpiece to be machined. shows the optical path of

Description of examples The figure shows a light source 10 controlled by a pulse generator 11. The light source 10 is a first light source. The diaphragm 1 is located directly adjacent to the first lens 12 which is located at the focal point of the lens 12. 3 is placed. A light source 10, a pulse generator 11, a first lens 12, and an aperture 1 3 is provided in the hand-held machine tool 14 and located in the casing of the hand-held machine tool 14. The region 15 that allows the light emitted from the light source 10 to pass therethrough. area in the diagram 15 is indicated by a dashed line. A position at a first distance 16 from the handheld machine tool 14 The surface 17 of the workpiece 18 is located at. During machining, the first distance 16 becomes the second distance. Changes to detached 9. 20, the boundary ray of the ray 21 emitted from the light source 10 is It is shown. Boundary ray 20 borders illuminated portion 22 of workpiece 18 surface. determine the world. It is imaged onto the screen 25 via the illuminated surface. Handheld machine tool 14 A surface 22 located at a first distance 16 from is imaged as a first image 27 and a second The surface 22 at a distance 19 is imaged onto the screen 25 as an image 28 . Screen 25 is Coincident with active surface 29 of photoreceiver 30. The output signal 31 of the light receiver 30 is processed by a signal processing device. A signal processing device 35 is supplied to the device 32 and a signal processing device 35 is provided. . The signal processing device 32 has two , is connected to the control circuit 36 of the electric motor 37 via the control line 3.8.39'. . Switch 40 is an on/off switch for a manual machine tool.

The light beam starting from the light source 10 is delivered to the workpiece 18 via the first lens 12 . If the light source 10 is located at the focal point of the lens 12, which is formed as a condensing lens, In this case, the parallelism of the emitted ray 21 bounded by the boundary ray 20 A bundle of light rays is formed.

determined by the aperture #) 13 located adjacent to the first lens 1.2 +um. A predetermined optical pattern is formed on the surface 17 by completely blocking some of the light rays. be able to. The emitted light ray 21 is irradiated onto a portion 22 of the surface 17 and is scattered. It will be done. A second lens 24, which is likewise designed as a condensing lens, The light beam turns are imaged as an image on the screen 25 of the second lens 24.

The optical device is mounted in or on the outside of the handheld machine tool 14 and 4 from the surface 17 of the workpiece 18 is determined. Table on screen 25 The position of the image 27,28 of the surface 22 is a unique function of this distance. For example, At a distance 16 of 1, a first image is formed, and at a second distance 19 a second image is formed. image is formed. The predetermined distance measurement method mentioned above is the triangular measurement method ( It is commonly known in measurement technology as Knowledge (VD I Zeitung 125. Published in 1983, No. 21 , p. 876). Continuous measurement of distance changes during machining operations using triangular measurement method has not been publicly known so far.

A receiver 30 is provided to detect different positions of the images 27, 28 and its active table Surface 29 must match screen 25 as precisely as possible. This requirement is met. The higher the degree of addition, the more accurate the position data of the two images 27 and 28. receiver 30 is, for example, a photodiode for detecting the position, a photodiode line, or t ri is a multi-sensor in the form of a CCD line. The output signal 31 of the sensor 30 is The signal processing unit 32 is supplied with the signal processing unit 32.

Arithmetic operations are performed in this signal processing device 32.

For example, the depth of a hole can be determined from the change in distance. During the processing operation, the position of image 27 of Ml is When moving in the direction of the position of the second image 28, the distance changes continuously or The depth of the hole is determined and displayed on the optical output device 34.

The advantageous embodiment will be explained using the example of hole depth measurement.

The target value - the depth of the hole is given in advance to the signal processing device 32 via the input device 33. ing. When drilling starts, a reset signal is sent to the display device 35 via the input device #33. - is input, and the display device 35 is set to zero. However, supplying hand-held machine tools Setting 14 to zero is also displayed.・In one other mode of operation, You can also display the distance from the actual hole depth to the target hole depth. Ru. When a warning signal is sent to the user of a hand-held machine tool just before the target value is reached, It is preferable to set the threshold value immediately before the target value (i.e., this (a warning is generated when the threshold value is exceeded) is input via the input device 33t. this When the threshold value is exceeded, the signal processing device 32 emits an acoustic signal via the acoustic output device 34t. Approaching the target value is indicated by flashing on the display device 35 simultaneously. optical output If the power device 35 is capable of displaying different color information, the threshold may be reached. This can be changed by changing the color.

The advantage of alerting the user of a hand tool just before the target value is reached is that , by reducing the feed force at an appropriate point in time, the motor 37 is freed from inertia after its interruption. If the workpiece 18 is over-drilled even if the target value is reached, the signal The processing device 32 communicates via the control line 38 to the control circuit 36 that the drive motor 27 is shut off. It supplies a signal and generates an acoustic signal.

When using a semiconductor light source as the light source 10, in pulse operation, the permissible continuous output A pulse output that exceeds the power can be sent out. High SZN ratio at high pulse power Therefore, the technical costs of the optoelectronic device can be reduced. Pulse on/off ratio By appropriately determining the amount of energy required, the average energy required can be reduced. This advantage is This is noticeable in battery-powered equipment.

Submission of translation of written amendment (Article 184-8 of the Patent Law) October 13, 1988 Yoshi, Commissioner of the Patent Office 1) Takeshi Moon 1. International application number PCT/DE 87100165 2. Name of the invention Distance measurement method of hand-held machine tool from workpiece 3, patent applicant Name: Low belt, 2 units, Guselshaft, Mitbeschlenktel, Hough Lang 4. Agent Address: 3-3-1-5 Marunouchi, Chiyoda-ku, Tokyo 100, Date of submission of amendment March 11, 1986 The scope of the claims 1. The receiver detects the light rays emitted from the light source and reflected from the surface of the workpiece to be machined. configured to detect; polling and/or impact polling; Optical measurement of the depth of drilled holes for hand-held machine tools with drilling and/or hammer poling In the method, the depth of the drill hole is determined using a known triangulation method, and the The triangulation method uses a method in which the light source (lO) is an optical pattern, preferably one point or one Project a line onto the surface (17, 22) of the workpiece, and This is a trigonometric measurement method in which a receiver (30) detects the emitted light beam, and a signal processing device is also used. The device (32) receives the signal sent from the photoreceiver (30) and the input device (33). is detected by trigonometry from the zero adjustment signal input at the start of drilling. The change in distance is converted to the depth of the drill hole, and the depth of the drill hole is displayed using an optical display device. (34) and/or an acoustic display device (35). A method for optically measuring the depth of a drill hole, characterized in that the depth of a drill hole is

2. Claims for setting the target value of the depth of the drill hole via the input device (33) The method described in paragraph 1.

international search report ANNEX To, FE INTERN entry τl0NkL 5EARCB! R Ez’ORT 0N INTERNATIONAL PPf, ICATION No, PCT/DE 87100165 (SA 16855)

Claims (12)

[Claims] 1. How to measure the distance of a handheld machine tool (such as a handball machine) from the workpiece In the method, a known triangulation method is used for distance measurement, and the said triangulation method is In the method, the light source (10) produces an optical pattern of points or lines, for example, on the workpiece (19). projected onto the surface (17, 22) of The light beam reflected from said surface (17, 22) is provided to a receiver (30); The light receiver (30) generates an electrical signal corresponding to the optical measurement signal to obtain a measurement value. display optically and/or acoustically A method for measuring the distance of a hand-held machine tool from a workpiece. 2. Use distance measurement to determine the depth of the drilled hole, The depth of the hole is determined by an input device (33), an optical output device (35) and/or an acoustic output device. In the signal processing device (32) comprising the device (34), whether the workpiece (18) According to claim 1, the method is determined from a change in the distance between the two drilling machines (14). How to measure the distance of a hand-held machine tool from the workpiece. 3. Continuously monitor the depth of the hole drilled during processing using the optical output device (35) Hand-held from a workpiece according to claim 1 or 2, which is displayed as Distance measurement method for machine tools. 4. The target value of the depth of the drilled hole is input to the signal processing device via the input device (33). Claims 1 to 3, wherein the target value is displayed on the optical output device by A method for measuring the distance of a hand-held machine tool from a workpiece according to any one of the items. 5. Displays the depth of the hole by sending a reset signal at the start of drilling via the input device (33) Hand holding from the workpiece according to claim 4 which can be input to the device (35) Distance measurement method for machine tools. 6. Using the optical output device (35), the actual depth and target depth of the drilled hole are determined. Claim 4 or Claim 4 wherein the difference between the two is continuously displayed during the processing operation. A method for measuring the distance of a hand-held machine tool from a workpiece as described in Section 5. 7. When the target value is reached, the drive motor of the drilling machine (14) is connected to the control line (38) and the control circuit. Claims wherein the signal is cut off by the signal processing device (32) via the path (36). Method for determining the distance of a hand-held machine tool from the workpiece described in Section 4. 8. When the target value is reached, an acoustic signal is sent out via the acoustic output device (34). from the workpiece according to any one of claims 4 to 7. Distance measurement method for hand-held machine tools. 9. inputting, via the input device (33), a threshold value located before the target value depth of the hole; 'When the threshold value is exceeded, a signal is sent out through the acoustic output device (34). Hand holding from a workpiece according to any one of claims 4 to 8. Distance measurement method for machine tools. 10. Claim 9, wherein the display device (35) blinks when the threshold value is exceeded. Method for measuring the distance of a manual machine tool from the described workpiece. 11. A claim that allows the color of the display device (35) to be switched when a threshold value is exceeded. A method for measuring the distance of a hand-held machine tool from a workpiece according to item 9 or 10. 12. Claims 1 to 11, wherein the light source (10) is operated in pulses. A method for measuring the distance of a hand-held machine tool from a workpiece according to any one of the items.