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AssigneeMitsubishi Jukogyo Kabushiki Kaisha
InventorsHiroshi Yamaji, Kiyoshi Furukawa
Estimating the term…
In a propeller measuring device, moving means move a probe relative to the propeller to a plurality of reference positions indicative of positions on a desired propeller shape. The probe determines the deviation from reference position and a recorder records the deviation. In one embodiment, the measuring means measures only from the time the probe contacts the propeller being measured until the reference position, which is a given distance beyond the position on a desired shape, is reached.
A propeller measuring machine, comprising a probe moving means responsive to feed signals and coupled to the probe for moving the probe, said probe having a first portion secured to said moving means and a second portion which is held by the first portion and which projects from the first portion and which includes a tip displaceable relative to the first portion when the probe contacts a solid member with the second portion, guidance means coupled to said moving means for producing feed signals which cause said moving means to move the probe to the predetermined locations near the surface of the propeller being measured and at each location to move the moving means so that the probe travels toward contact with the surface of the propeller, detecting means coupled to said probe and said guidance means for starting the observance of feed signals from the guidance means at the time the tip is displaced in response to contact with the propeller and for continuing the observance of the feed signals until the feed signals emitted by the guide means are sufficiently great to have caused movement of the moving means toward the surface to a reference position located a predetermined distance relative to a desired propeller shape, and recording means coupled to said detecting means for recording the output of said detecting means.
The method of measuring the surface of a propeller, which comprises:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
For measuring contours or curvatures: of propellers or turbine blades
Measuring length, thickness or similar linear dimensions
Term ended 18 Oct 1994 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
This invention relates to a co-ordinate measuring apparatus, particularly to one which measures the shape of a propeller.
Heretofore, three-dimensional measuring apparatuses have measured the distance between a predetermined origin (reference point) and the measuring point. An error value was determined by calculating it from the measured value. Thus, such apparatuses cannot be fixed to a processing machine nor measure the above-mentioned error directly without calculating the error.
An object of the invention is to provide a co-ordinates measuring apparatus for a propeller processing machine which permits a centering operation of a bossed area during processing of the propeller wing area, a verification of the cut off area by means of a co-ordinates position measurements of the wing area, or a measuring inspection of the manufacturing error at each co-ordinate position after manual finishing.
Here, brief explanations for the drawings will now be described.
FIG. 1 is a side view which illustrates diagrammatically the construction of an embodiment of the device according to the invention;
FIG. 2 is a block diagram for the explanation of the operation of the inventive device shown in FIG. 1;
In FIG. 1, the co-ordinate measuring apparatus according to an embodiment of the invention is composed of a detecting head 1 serving as an electric micrometer attached to a main axis head 3 which is coupled to a ram 3a of the propeller processing numerical control machine, a monitoring meter 6, a preset counter 5, and a digital printer 4. The input signal of the counter 5 utilizes control pulses for the ram, and the motion instructions and the timing instructions of the printer 4 act by the well-known auxiliary (M) instructions of the numerical control.
The control pulses for the ram correspond to the specific distances. For example, the ram 3a is moved 0.01 mm by one control pulse. Thus, it is possible to measure vertical motion of the main axis head 3 utilizing these control pulses. The control pulses for the ram motion are used as an input signal for the counter 5 for measuring movement of the main axis head 3 and detecting head 1.
The operation is shown in FIG. 2. Here the measuring position is first determined by the previously programmed numerical control tape. After this determination of the table saddle position, the ram is moved down. When the detecting head 1 attached to the main axis head 3 is in contact with the propeller wing area 2, a measuring probe 12 of the detecting head 1 shown in FIG. 3 is pressed against the wing area 2, and a cam plate 11 moves against a spring 10. On the basis of the movement of the cam plate 11, a guide bar 9 of the differential transformer 8 climbs the slope of the cam plate 11. Thereafter the guide bar 9 is independent of the effect of the stroke of the measuring probe 12. That is, the probe 12 can be displaced without varying the measuring range of the differential transformer 8.