Measuring device for a coordinate of a figure

Abstract: This invention relates to a measuring device for a coordinats of a figure in which values of coordinate positions of a plurality of any given points are input the coordinate of an asked for position relating to said given points is calucutated and marking the asked for position. The measuring device for a coordinate of a figure comprises a body (1) having rollers (2) to trace a running line, a measuring lever (6) pivoted on the body (1) rotating right or left relative to the running line in a horizontal plane, characterized by a display (4), input device and a calculating device provided in the body, a tracing part, a reading / marking (writing) turn over switch, a reading switch and a marking needle (8) provided in the measuring lever.

Description: Field of the invention This invention relates to a device for measuring the coordinate of a figure in which values of coordinate positions for a plurality of any given points are input and the coordinate of a position asked for relating to the given points is caluculated and the asked for position, such as center of circle, by reading three points or a new point by coordinate transformation is marked. Back ground of the Invention Heretofore, the inventor herein proposed US-A-4616419 to determine a point relating to a plurality of given points. However, the device of the US-A-4616419 requires complicated operation for a geometrical drawing, and a long time for a drawing. Brief description of the Invention This invention intends to eliminate said drawbacks and provide a device with which it is possible to rapidly mark an asked for point in a coordinate plane without the necessity of a complicated calculation, or geometrical drawing. Another object of this invention is to provide a measuring device for a coordinate of a figure. According to the invention, body 1 has rollers 2, 2 running along a line, a measuring lever 6 is pivoted by a shaft on the body 1 rotating right or left relative to the running line in a horizontal plane, characterized by a display 4, input means 3 and a calculating means provided in said body 1. A tracing part 7, a reading / marking (writing) turn over switch 9, a reading switch 10 and a marking needle 8 are provided in measuring lever 6. The operation of the device is to read the position of given points by a signal c₁ of an angular counter 2a of encoder 2b from rollers 2 and a signal c₂ of angular counter 6a of encoder 6c of the measuring lever 6 and perform a calculation in CPU designated by a functional key.The difference between the position of the marking needle and asked for position is displayed. The above and other objects, advantages and novel features of this invention will be more fully understood from the following detailed description and the accompanying drawings, in which like reference numbers indicate like or similar parts throughout wherein; Brief Description of the Drawings Fig 1 is a plan view of one embodiment of a measuring device fora coordinate of a figure of the invention comprised of a body 1 and a measuring lever 6. Fig 2 is a block diagram of the measuring device. Fig 3 is a flow chart illustrating operation of the device. Detailed Description of the Invention Body 1 is comprised of calculating means, and has a pair of rollers 2, 2 for reciprocal movement along a line. At the upper face of the body 1, there are an input device ( key board) 3 and a displaying device 4 for displaying the result of a calculation in a calculating means and a fixing lever 5 for fixing rollers 2 at a desired position. Measuring lever 6 is pivotally mounted on body 1 about a vertical shaft 6b that can swing right or left in a plane from the line of movement. At the end of the measuring lever 6, there are a tracing part 7 comprised of convex lens and a reading mark 7′ and a marking needle 8 for marking a designated positon. At the middle of measuring lever 6, there are a reading / marking (writing) turn over switch 9 for directly reading the position or displaying (displaying the difference of a coordinate position between marking needle 8 and the reading position or reading mark 7′) a calculated result from a calculating means to the calculating means in body 1 and a reading switch 10 for directly reading the position of mark 7′ of the tracing part 7. Locking means 11 provided in body 1 rotates up and down for locking measuring lever 6 at a central position (i.e. the moving direction of body 1 ) and a power switch is OFF at a locking position and ON at a releasing position. The following will explain the operation of the above device. 1) Reading operation As shown in Fig 3, at step P₀, the measuring lever 6 is in the position shown in Fig 1. The reading / marking (writing) turn over switch 9 is set for reading as shown in a step P₁ in Fig 3. ( This switch 9 changes alternatively to reading or marking according to an alternate push on the button). The position mark 7′ of tracing part 7 of measuring lever 6 is then shifted to a position of the coodinate position to be read, and the reading switch 10 is pushed as shown steps P₂, P₃ in Fig 3. This operation is repeated according to the position of each point to be read. 2) Marking operation of an asking position. The asked for position, such as the center of a circle, passing three read points or a new point by coordinate transformation is calculated from said read (given) position as explained above. The given position is input to a CPU by a key in keyboard 3 as shown a step P₄ in Fig 3. Calculations in the CPU are designated by a function key or a conversion key in keyboard 3. The reading marking (writing) turn over switch 9 is set in marking as shown a step P₅ in Fig 3. Display 4 shows the values of the x axis and y axis of the difference between present positon and position to be calculated, so that an operator can move the measuring lever 6 as shown a step P₆ in Fig 3 to see the displayed value become zero as shown a step P₇ in Fig 3, and when it reaches zero, marking needle 8 is pushed and the position is marked on the paper as shown a step P₈ in Fig 3. The following will explain the operation of the inner device. When reading / marking (writing) turn over switch 9 is set to reading and position mark 7′ of tracing part 7 is shifted to a position to be read, angular counter of roller 2 and angular counter of measuring lever 6 generate signals c₁, c₂ and are memorized in a memory. Inner calculating means calculates the mechanical coordinate position of read point by pushing the reading switch 10. In the mechanical coordinate position, the direction of roller 2 is the x axis and the vertical direction against the direction of roller 2 is the y axis. By this mechanical coordinate position, the coordinats of the figure to be measured are calculated, in this case, the coordinate of an original point and (plurality of) any positions to be measured are calculated and memorized in a memory. These calculations are performed about a read positon of mark 7′ of tracing part 7 and not the position of marking needle 8. 3) Value input operation. In the above case 1), the position is designated on the figure, however, it is possible to input values by a function key and value key and memorize them in the memory. 4) Marking operation of a designated position. When the reading / marking (writing) turn over switch 9 is set to marking as shown a step P₅ in Fig 3, calculating means performs calculations designated by said function key from said read or input datum. In this case, the difference of position ( difference in coordinate x′ , y′ ) between position mark 7′ and marking needle is corrected in by calculation. Display 4 displays the difference of the value between the position of marking needle 8 and the designated position to be marked as the value of the x axis and y axis. As explained above the display varies according to the position of marking needle 8, and the value of the display changes according to the movement of marking needle 8. Consequently, when marking needle 8 is shifted to a position to be marked, displayed values of x, y are zero and show that marking needle 8 is in a position to be correctly marked. As explained above, according to this invention, it is possible to mark a necessary point without the necessity of complicated calculations and drawings.

Claims: A measuring device for a coordinate of a figure comprising a carriage (1) mounted on a pair of rollers (2) for reciprocal movements along a line, a measuring lever (6) pivotally mounted on a vertical shaft of the carriage, a display device (4), input means (3) and calculating means provided on said carriage (1), the measuring lever (6) having tracing means (7) at the outer end of said measuring lever, a reading switch (10) and a marking needle (8) for marking selected points on a horizontal plane characterized by a reading/marking (writing) turn over and a selecting switch (9), both switches (9 and 10) being push buttons, so that the measuring device can be quickly switched from marking to reading and back to marking from reading. Measuring device according to claim 1 in which said input means comprises a keyboard (3) on said body (1). Measuring device according to claim 1 or 2 including a locking lever (5) for locking said rollers (2), one of a desired position. Measuring device according to claims 1 to 3 including a locking means (11) rotating up or down to lock said lever (6) in a central position.

Inventors: KUBO AKIO, KUBO, AKIO
Applicants: KUBO AKIO, KUBO, AKIO
Application year: 1990
Main classification: G01B21
IPC codes: G01B5, B43L13, G06F3, G01B21