DE102006007990A1 - Hand-operated machine tool e.g. battery-operated drilling machine, for machining work piece, has measuring unit for transmitting measuring signal, where work progress parameter is implemented as geometrical parameter of measuring signal - Google Patents

Abstract

The machine has a measuring unit (32) provided for detecting a work progress parameter and for transmitting a measuring signal (34), during machining of a work piece (12). The work progress parameter is implemented as a geometrical parameter of the measuring signal, where the geometrical parameter of the measuring signal is implemented as an alignment parameter or a displacement parameter. The measuring unit has a receiving surface to receive the measuring signal, where the work progress parameter is adjusted relative to the receiving surface.

Description

State of technology

The The invention is based on a hand tool with a measuring unit for recording a work progress characteristic according to the preamble of Claim 1.

It are known hand tool machines that are used to signal a Work progress with a workpiece machining with a mechanical stop are provided. For example, drilling machines are known which have a Have measuring rod, through which a desired drilling depth while drilling a workpiece can be adjusted.

Advantages of invention

The The invention is based on a hand tool with a measuring unit for detecting a work progress characteristic.

It It is suggested that the measuring unit send a measuring signal is provided and the work progress characteristic as a geometric characteristic of the measurement signal is trained. This allows a contactless, precise detection of Work progress characteristic achieved become. For example, you can mounting, tuning a mechanical detection means and thus resulting inaccuracies are avoided. By the detection of a geometric characteristic can be a simple structure the measuring unit can be achieved. In particular, a small measuring time or a small amount of computation can be achieved if the work progress at a workpiece machining even by the course of a geometric parameter, e.g. one Distance, angle, etc., is characterized. For example can be based on a conversion of a temporal characteristic of the measurement signal into a geometric characteristic and / or waived a comparison of the measurement signal with a reference signal become. Under a "work progress characteristic" is in particular a characteristic understood which is an accomplished or achievable stage of processing at a workpiece machining preferably uniquely characterized. It is advantageously used to take into account the processing stage during operation of the power tool as well as for signaling and / or for determining this processing stage. Under a "geometric Characteristic of the measuring signal "should in particular a parameter of the measurement signal be understood, which is a spatial Characterized the course of the measurement signal. For example, this can Characteristic as course direction, Beam angle, beam width, etc. may be formed. The measuring signal can also from a transmission signal, which is sent to a workpiece, and a Receive signal, which is excited by the transmission signal and for detection the work progress parameter is processed will be formed. Furthermore, the measuring signal is preferably in shape sent by electromagnetic waves.

Preferably the work progress characteristic is designed as a distance characteristic. Thereby can especially simple and common Methods used to record the work progress characteristic become. This is particularly suitable when the hand tool is designed as a drill. This can be a precise detection a drilling depth can be achieved, whereby a high quality work achieved can be.

In addition, will proposed that the geometric characteristic formed as alignment characteristic is. This allows especially simple and common Means for detecting the geometric characteristic of the measurement signal, e.g. optical elements are used. The alignment parameter is preferred detected with respect to a direction predetermined by the measuring unit.

In In this context, it is proposed that the measuring unit should have a receiving surface for receiving the measurement signal and the work progress characteristic as alignment the measuring signal is formed relative to the receiving surface. It can thereby to the recording of the work progress characteristic simple processing of the measurement signal can be achieved, e.g. by doing optical elements are integrated in the receiving surface.

In a further embodiment The invention proposes that the measuring unit to a Operation is provided in an infrared range. It can thereby especially common and cost-effective Transmitting and receiving means for the measuring signal are used. Furthermore, a low sensitivity the measuring unit, in particular against vibrations, in a Workpiece machining to be achieved. An "infrared region" is intended in particular to mean a region of the electromagnetic Spectrum are understood, preferably in a wavelength interval between 780 nm (nanometers) and 1 mm (millimeters) is arranged. The range is advantageously selected such that a disturbance of a Detection process by a heat radiation environment objects can be prevented. Under a "operation in one Infrared range "should in particular, an operation are understood in which at least a predominant one Part of the transmitted energy of the measurement signal in an infrared range is done. Preferably, the maximum of the spectral lies Radiance of the measuring signal in the infrared range.

It it is further proposed that the handheld power tool has a housing section, which is assigned to the measuring unit and permeable to the measuring signal. As a result, an advantageous protection of the measuring unit, in particular against penetration of dust can be achieved. If the measuring signal is in Form of electromagnetic waves in a range of electromagnetic Spectrum sent, is the housing section preferably permeable in this area. Under "permeability" in this context, in particular a permeability which is at least 10% and preferably greater than 30% is, in particular, larger than 50%.

In An advantageous development of the invention is proposed in that the handheld power tool has a signal processing unit which is intended to be dependent from the work progress parameter, a work progress signal to create. As a result, recording the work progress characteristic with a high flexibility be exploited. For example, the work progress signal for signaling a work progress, e.g. optically and / or acoustically, and / or as a control signal for controlling an operation the hand tool can be used. Furthermore, the signal processing unit be a component of the measuring unit.

It can In this context, a simple structure and a particularly simple Operation of the signal processing unit can be achieved when the signal processing unit designed as a threshold switching element is.

Further can increase the ease of use when the hand tool comprises a setting unit, which is provided for setting a threshold of the work progress characteristic.

is the signal transmission unit for wireless transmission provided the work progress signal, can also be a special simple design of the power tool can be achieved, wherein can be dispensed with a complicated wiring. For example can the signal transmission unit for inductive and / or capacitive transmission the work progress signal, in particular to an output unit and / or to a control unit for controlling an operation of the portable power tool, be designed.

It It is further proposed that the hand tool machine an additional handle has, in which the measuring unit is arranged. This can on an additional Space within a hand tool housing, on which the auxiliary handle can be fixed for the measuring unit will be omitted. The auxiliary handle is in the mounted Condition expediently attached to a tool-side region of the portable power tool housing, which makes a short distance for the measurement signal can be achieved to a workpiece to be machined. alternative the measuring unit can be mounted in the power tool housing, preferably in a tool-side region of the power tool housing.

drawing

Further Advantages are shown in the following description of the drawing. In the drawing are exemplary embodiments represented the invention. The drawing, the description and the claims contain numerous features in combination. The specialist will the features also expediently individually consider and summarize to meaningful further combinations.

It demonstrate:

1 a drilling machine with a measuring unit arranged in an auxiliary handle during the machining of a workpiece,

2 a sectional view of the auxiliary handle with the measuring unit,

3 the measuring unit in two different positions relative to the workpiece,

4 a circuit of the drill with the measuring unit and a signal processing unit and

5 the hand tool with an alternative auxiliary handle and a wireless transmission of a work progress signal.

description the embodiments

1 shows a battery-powered drill 10 trained hand tool when machining a workpiece 12 , This has a housing 14 with a switch 16 , a tool holder 18 in which a drill 20 is fixed, and an auxiliary handle 22 on, on the case 14 is attached. Inside the case 14 are a drive unit 24 and a control unit 26 for controlling the drive unit 24 to recognize. In operation of the drill 10 may provide an operator with information such as a rotational speed, a battery charge state, etc., via an output unit configured as an LCD display 28 be issued. By a setting unit 30 The operator may also enter information such as a speed. The drill 10 is also provided with a function through which a work progress in the machining of the workpiece 12 can be displayed to the operator. In this embodiment, the work progress is by a distance A of the drill 10 to the workpiece 12 characterized. By means of another function of the drill 10 can be a drive of the drill 20 through the drive unit 24 be adjusted or kept depending on the work progress. This is the drill 10 with a measuring unit 32 provided, which in the auxiliary handle 22 is arranged. This generates a measuring signal during operation 34 in the form of an infrared radiation, which is on the workpiece 12 reflected and from the measurement unit 32 is received again. In additional handle 22 is also a signal processing unit 36 arranged. Sending, receiving and editing the measurement signal 34 is determined by the 2 and 3 shown in more detail.

In 2 is the auxiliary handle 22 the drill 10 seen in a sectional view from above. The auxiliary handle 22 has a housing 38 within, within which the measurement unit 32 is arranged. The housing 38 has a housing section 40 on, which serves as an infrared filter and is made of a permeable to infrared radiation material. This housing section 40 provides a line of sight of the measuring unit 32 to a drilling area 42 of the workpiece 12 and an advantageous protection against ingress of dirt and dust in the for the measuring unit 32 within the auxiliary handle 22 provided space. The measuring unit 32 has a transmitting unit 44 and a receiving unit 46 on that in 3 are shown. The measuring signal 34 is via a transmit lens 48 sent to the workpiece 12 reflected and via a receiving lens 50 from the receiving unit 46 receive.

In 3 is the functional principle of the measuring unit 32 explained with reference to a schematic sketch. The transmitting unit 44 is designed as a light emitting diode, which in operation the measurement signal 34 generated in the form of infrared radiation. For clarity, in the figure, only the part of the workpiece 12 represented in the reflection of scattered light from the receiving unit 46 Will be received. There are two positions of the workpiece 12 relative to the measuring unit 32 , a close position (dashed) with a distance A _n and a distant position with a distance A _f . The measuring unit 32 has a workpiece machining the workpiece 12 facing receiving surface 52 on. In the near and far position, the reflected measurement signal points 34 each a different orientation relative to the receiving surface 52 which is characterized by an orientation characteristic α _n or α _f formed as an angle. This alignment parameter α _n or α _f , which is a geometric characteristic of the measurement signal 34 depends itself on the distance A _n or A _{f of} the workpiece 12 relative to the measuring unit 32 from, and is therefore designed as a distance characteristic. Since the work progress in the considered embodiment is given by the course of the distance A, the alignment characteristic α _n or α _f additionally represents a working progress characteristic. Furthermore, with a known distance L between the center of the transmission lens 48 and the center of the receiving lens 50 and with the detected orientation characteristic on or α _f by a triangulation method, the distance A _n or A _f to the workpiece 12 be determined.

To detect this working progress parameter, which is designed as an orientation characteristic α _n or α _f , the receiving lens is 50 and the arrangement of the receiving unit 46 to the reception lens 50 chosen such that the workpiece 12 reflected measurement signal 34 through the receiving lens 50 on a photosensitive surface 54 the receiving unit 46 is focused. The measuring signal 34 becomes at the near position at a point P _{n of} the surface 54 while at the distant position it is focused at a point P _{f of} the surface 54 is focused. The receiving unit 46 generates an electrical signal from the point P _n or P _{f of} the focused measurement signal 34 on the photosensitive surface 54 depends. This is the receiving unit 46 formed by a photodetector, which is designed for example as a PIN diode (positive intrinsic negative diode). This position of the point P _n or P _{f of} the focused measurement signal 34 on the surface 54 depends on the orientation of the measurement signal 34 relative to the receiving surface 52 and serves to detect the alignment parameter α _n or α _f .

The measuring unit 32 outputs, as an output signal, an output voltage V _out which depends on the work progress characteristic formed as the alignment characteristic α (the alignment characteristic α should be considered here as a continuous variable included in the in 3 shown cases, the values and α _f assumes). For example, the output voltage V _{out is} proportional or inversely proportional to the orientation characteristic α. The output signal with the output voltage V _out is then in the signal processing unit 36 processed. This is based on the 4 explained. It is shown a circuit in which the measuring unit 32 , the signal processing unit 36 , the control unit 26 , the drive unit 24 , the output unit 28 and the adjustment unit 30 can be seen. The signal processing unit 36 can be a work progress signal 56 generate that as a control signal to the control unit 26 is given. When the distance A reaches a certain limit corresponding to a desired work progress, it can generate the work progress signal 56 and its transmission to the control unit 26 an operation of the drive unit 24 held or, eg by switching egg ner speed, be adapted to the achieved work progress. For this purpose, the signal processing unit 36 designed as a threshold switching element. In this, the output voltage V _{out is} compared with at least one adjustable limit value which corresponds to the desired work progress and with the aid of the setting unit 30 can be adjusted. The work progress signal 56 can also be to the output unit 28 be transmitted, whereby the achievement of a desired work progress can be signaled by optical display and / or by an acoustic signal to the operator. In a variant, which also based on the 4 is explained, is the signal processing unit 36 ASIC (Application Specific Integrated Circuit), which is programmed according to the purpose of an application. In this element, the output signal with the output voltage V _{out is} preferably digitized and processed. For example, the distance A can be calculated and the output unit 28 be displayed to the operator. The continuous progress of the work progress can also be determined and via the output unit 28 are displayed. In a further embodiment, the signal processing unit 36 in the measuring unit 32 be integrated, which components and space can be saved.

In 5 is another embodiment of the drill 10 shown. There are no new reference numerals for the above-described and identical parts. The drill 10 has a signal transmission unit 58 on, the unit of measurement 32 is assigned and in the additional handle 22 is arranged. This is with the signal processing unit 36 connected and serves that of the signal processing unit 36 issued work progress signal 56 wireless to the control unit 26 and / or to the output unit 28 transferred to. The signal transmission unit 58 is designed as an inductive transmitting element. It is conceivable in one embodiment that the signal transmission unit 58 as a capacitive transmitting element or as a transmitting element for transmitting the working progress signal 56 is formed in the form of an electromagnetic wave. In additional handle 22 is also a power supply unit 60 for supplying the measuring unit 32 , the signal processing unit 36 and the signal transmission unit 58 arranged. Thus, on connecting means of the auxiliary handle 22 for transmitting the work progress signal 56 and / or on connection means for power supply in the auxiliary handle 22 arranged units and corresponding counter-connection means of the housing 14 be waived.

Claims (10)

Hand tool with a measuring unit ( 32 ) For detecting an operation progress parameter, characterized in that the measuring unit ( 32 ) for sending a measuring signal ( 34 ) is provided and the work progress characteristic as a geometric characteristic of the measurement signal ( 34 ) is trained. Hand tool according to Claim 1, characterized the work progress characteristic is designed as a distance characteristic is. Powered hand tool according to claim 1 or 2, characterized in that the geometric characteristic is formed as alignment characteristic (α _n , α _f ). Hand tool according to claim 3, characterized in that the measuring unit ( 32 ) a receiving surface ( 52 ) for receiving the measurement signal ( 34 ) and the work progress characteristic as alignment of the measurement signal ( 34 ) relative to the receiving surface ( 52 ) is trained. Hand tool according to one of the preceding claims, characterized in that the measuring unit ( 32 ) is provided for operation in an infrared range. Hand tool according to one of the preceding claims, characterized by a housing section ( 40 ), which of the measuring unit ( 32 ) and for the measuring signal ( 34 ) is permeable. Hand tool according to one of the preceding claims, characterized by a signal processing unit ( 36 ), which is provided, depending on the work progress characteristic, a work progress signal ( 56 ) to create. Hand tool according to claim 7, characterized in that the signal processing unit ( 36 ) is designed as a threshold switching element. Powered hand tool according to Claim 7 or 8, characterized by a signal transmission unit ( 58 ) for the wireless transmission of the working progress signal ( 56 ) is provided. Hand tool according to one of the preceding claims, characterized by an auxiliary handle ( 22 ), in which the measuring unit ( 32 ) is arranged.