Arrangement for automatic working data set-up for driving implements

• US 4,820,962 A
• Filed: 10/28/1987
• Issued: 04/11/1989
• Est. Priority Date: 10/31/1986
• Status: Expired due to Fees

• Current Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Original Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Inventors: Millauer, Wolfgang
• Primary Examiner(s): Shoop, Jr., William M.
• Assistant Examiner(s): BERGMANN, SAUL
• Application Number:
  US07/114,413
• Time in Patent Office: 531 Days
• Field of Search: 318/602, 318/17, 76/108 R
• US Class Current: 318/602
• CPC Class Codes: B25D 17/088 with radial movable locking elements co-operating with bit shafts specially adapted therefor
• CPC Class Codes: B25D 2217/0049 Roll-shaped locking members
• CPC Class Codes: B25D 2250/155 Marks, e.g. identification marks, indication scales, visualising means
• CPC Class Codes: B25D 2250/221 Sensors
• CPC Class Codes: G05B 19/128 the workpiece itself serves as a record carrier, e.g. by its form, by marks or codes on it
• CPC Class Codes: G05B 19/408 characterised by data handling or data format, e.g. reading, buffering or conversion of data
• CPC Class Codes: G05B 2219/49302 Part, workpiece, code, tool identification

Abstract

Single or multi-track data markings are provided on the shank of a tool bit between a torque transmission region at one end and a working region proper for automatic working data set-up of a driving implement for exchangeable tool bits. The data markings consist of a sequence of notch-like depressions and lands, which are scanned by inductive proximity switch sensors. In case of multi-track codings, one track is used for clock timing. In case of single track codings, an rpm transmitter signal is used as a clock time signal during the information decoding in order to obtain an unequivocal identification signal. Signal evaluation occurs in a microprocessor with at least two counter register combinations, which alternately, in the sequence of the sensor signal, count the pulses of the time clock signal. The respective combination contents are compared in an evaluation unit of the microprocessor with prestored table values. In this way, appropriate driving parameters for each type of tool bit are made available for the motor drive.

Claims

1. An arrangement for automatic working data set-up particular to each type of tool bit for driving implements adapted to various types of exchangeable tool bits, said arrangement comprising;

(A) data markings formed on said tool bits indicative of each type of tool bit, said data markings being arranged on a shank of each tool bit in the region serving for retention and actuating connection with the driving implement and distributed around a circumference of said tool bit;

(B) a marking read-out device built into a tool bit receptacle of the driving implement rigidly mounted to a housing of the implement, said read-out device being aligned with the data markings when the tool bit is inserted into the driving implement, said marking read-out device generating an electric signal corresponding to a sequence of the data markings on the circumference of the shank, when there, is relative motion between the tool bit and the housing; and

(C) an electronic evaluation arrangement for receiving the electric signal, said electronic evaluation arrangement generating appropriate adjustment orders for adjusting a drive unit of the driving implement for appropriate working parameters of the tool bit.

2. An arrangement according to claim 1, wherein the data markings comprise a sequence of notch-like depressions distributed across the circumference of the shank, said depressions being separated from each other by lands on the shank perimeter, in such a way that a sequence of said depressions and lands constitute at least one circumferential data track;

and wherein the marking read-out device comprises at least on inductive sensor built into a tool bit receptacle of the driving implement, which detects the sequence of depressions and lands.

3. An arrangement according to claim 2, wherein the sensor comprises a metal-clad coil aligned to the data track, said sensor being part of a high frequency oscillating circuit.

4. An arrangement according to claim 2 or 3, wherein at least two data tracks and at least two corresponding sensors are provided, and wherein one of the data tracks serves as a clock time transmitter track for establishing a relationship between a speed of motion of said tool bit and the reading of other of said data tracks.

5. An arrangement according to claim 1 or 2, including an impulse transmitter operatively connected to the drive unit of the driving implement and operatively connected to said electronic evaluation arrangement for supplying at least one clock-time signal functioning as a rotational angle reference to said electronic evaluation arrangement.

6. An arrangeent according to claim 5, wherein said impulse transmitter comprises a magnetic pole wheel with a quantity of 2p magnetic poles, p being an integer, integral numbers of said magnetic poles being seated upon a motor shaft of the drive unit, and a second sensor integral with the housing for generating, during revoluations of the magnetic pole wheell, an alternating voltage with a period corresponding to the quantity of the magnetic pole pairs.

7. An arrangement according to claim 6, wherein the second sensor is an induction coil.

8. An arrangement according to claim 6, wherein the second sensor is a Hall generator.

9. An arrangement according to claim 1, wherein the electronic evaluation arrangement comprises two counter register combinations which are alternately activated for counting pulses of a clock time signal, and a switch controlled by said electric signal of the sensor, for alternately activating said counter register combinations, contents of said counter register combinations, achieved at fixed spacings, supplying and order signal for working data adjustment of the driving implement by comparison with stored table values.

10. An arrangement according to claim 1, wherein the electronic evaluation arrangement comprises two counter register combinations which are alternately activated for counting pulses of a clock time signal, a switch, reversible by the electric signal of the sensor, for alternately activating said counter register combinations, contents of said counter register combinations, obtained at fixed time intervals, being divided by each other or subtracted from each other, the result thereof being supplied as an order signal for working data adjustment of the driving implement by comparison with stored table values.

11. An arrangement according to claim 9 or 10, wherein said driving implement comprises transmission ratios switchable by a switch gear unit, and said arrangement includes selectively dialable comparative tables depending on the transmission position.