JPS6351878B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a ruler angle display device for a universal parallel ruler that digitally displays the rotation angle of a straightedge using an absolute type encoder plate. The main object of the present invention is to provide a device that digitally displays the angle of a straight edge using an absolute method, in which the zero reference for angle display can be easily set. Another object of the present invention is to provide a device that digitally displays the angle of a straight edge using an absolute method, in which a plurality of zero references can be set with a simple operation. The configuration of the present invention will be described in detail below with reference to embodiments shown in the accompanying drawings. In FIG. 1, reference numeral 2 denotes a horizontal rail fixed to the upper edge of the drawing board 4, to which a horizontal cursor 6 is movably connected along the longitudinal direction of the horizontal rail 2. Reference numeral 8 denotes a vertical rail, one end of which is connected to the horizontal cursor 6 so as to be rotatable within a plane perpendicular to the 4 surface of the drawing board. The vertical rail 8
A tail roller 10 is rotatably attached to the other end, and the tail roller 10 is placed on the 4th surface of the drawing board. A vertical cursor 12 is attached to the vertical rail 8 so as to be movable along the longitudinal direction thereof, and a support member 18 of the head 16 is connected to the cursor 12 by a hinge connecting portion 14. .
Straight rulers 22 and 24 are removably fixed to a ruler attachment member 20, which is one of the components of the head 16. By manually rotating the handle 26, which is one of the components of the head 16, the ruler attachment member 20 is attached to the handle 26.
It can be rotated within a plane parallel to the four planes of the drawing board. By rotating the ruler attachment member 20, the angle of the straight ruler 22 or 24 with respect to the base line can be changed. Said straightedge 22
Alternatively, the amount of change in angle with respect to the base line 24 is configured to be digitally displayed on a display section 28 provided in the head 16. Note that the base line refers to a straight line parallel to the straight edge 22 or 24 when the display section 28 shows zero. The display section 28 has a liquid crystal as its main component, but a light emitting diode, a display tube, etc. may also be used. If you grasp the handle 26 of the head 16 with your hand and apply force to the head 16 in any direction parallel to the 4 surfaces of the drawing board, you can move the horizontal cursor 6 along the horizontal rail 2 and move the vertical cursor 12.
head 16 by movement along longitudinal rail 8 of
And the straightedges 22 and 24 are moved to arbitrary positions on the drawing board 4. Next, the structure of the head 16 will be explained with reference to FIGS. 2 and 3. Reference numeral 14 designates a hinge connecting member, one of which is rotatably supported by the vertical cursor 12, and the other of the hinge connecting member 14 is connected to a head support member 18. Reference numeral 26 denotes a handle, and four batteries are housed in a housing formed in a cavity inside the handle. The handle 26 has a member 3
2 and 34 are fixed with screws. 36 is a transmission plate, and guide portions 38, 40 of the member 32
As shown in FIG. 2, it is supported so as to be movable in the left and right direction. An operating member 4 is provided at the rising portion of the transmission plate 36.
2 is rotatably supported on a shaft 44, and one of the elongated pieces 46 is fixed to the operating member 42. A leaf spring 48 has one end fixed to one end of the transmission plate 36, and a rising portion 50 is formed at the other end of the leaf spring, and the rising portion 50 is inserted into a hole formed in the elongated piece 46. It's fitted. A stopper 52 is fixed to the member 32. 54 is a main shaft, which is fixed to the member 34 with a screw. A conical rod 56 is disposed in the tube portion of the main shaft 54, and the upper end of the conical rod 56 is connected to the leaf spring 48. A ring 58 is fitted onto the outer peripheral surface of the main shaft 54, and a disk 60 is rotatably fitted onto the outer peripheral surface of the ring 58. The collar portion of the board 60 is fixed to a fixing plate 62 with screws. An absolute type encoder plate 64 is fixed to the lower surface of the fixed plate 62. The fixed plate 62
is fixed to the head support member 18. Reference numeral 66 denotes a switch drive plate, the middle portion of which is connected to the lower end of the conical rod 56, and one end of the drive plate 66 is rotatably supported by the ruler mounting member 20. 6
Reference numeral 8 denotes an elongated piece, which is connected to the switch drive plate 66 so as to be interlocked with the switch drive plate 66 in the left-right direction in FIG. A shaft 70 is protruded from the elongated piece 68, and the shaft 70
is slidably fitted into a long hole 74 transparently provided in the swing piece 72. The elongated piece 68 is biased toward the left in FIG. 3 by the elasticity of the spring. One end of the swinging piece 72 is rotatably supported by the ruler mounting member 20, and the other end of the swinging piece 72 has a claw portion 72.
a is opposed to the outer peripheral surface of the index ring 76. The index ring 76 is connected to the disk 60.
It is fixed to the flange of. On the outer peripheral surface of the index ring 76, index recesses 76a are formed at every 15 degrees. The ruler mounting member 20
is fixed to the lower end surface of the main shaft 54. 78
is a limit switch fixed to the ruler mounting member 20. Reference numeral 80 denotes a groove bored in the upper surface of the fixing plate 62 along the circumferential direction. A brake band 82 is disposed in the groove 80, and the member 34 is moved by the braking action of the brake band 82. It is configured so that it can be removably fixed to the fixing plate 62. The brake band 8
The second braking operation can be performed by operating the angle brake lever 84. Next, the absolute encoder will be explained. On the outer periphery of the transparent synthetic resin encoder plate 64, the angle of the straightedge is written in 13-bit binary coded decimal notation.
A slit portion 88 for displaying seconds is formed by printing. Therefore, the slit portion 88
are formed in large numbers along the trajectory of 13 rows (10 rows are shown in the drawing, and the others are omitted) in the circumferential direction of the encoder plate 64. 90 is an IC board fixed to the ruler mounting member 20, and a support frame 92 is fixed to this. At the upper part of the recessed part of the support frame 92, there are 13
A number of light emitting elements 94 are attached in a line in the radial direction of the encoder plate 64, and in the lower part of the recessed part,
Thirteen phototransistors or light receiving elements 96 are arranged in a line in the radial direction of the encoder plate 64, corresponding to the thirteen rows of slits 88. The light receiving element 96 and the light emitting element 94 are fixed to ceramic substrates 98 and 100, respectively.
8, 100, acrylic semicylindrical lenses 102, 104 are fixedly installed. The light emitted from one light emitting element 94 passes only through the corresponding slit portion 88 of the track due to the action of the lens 104.
One light receiving element 96 facing the light emitting element 94
The light is focused only on Note that the 13 phototransistors 96 do not have to be arranged in a line along the radial direction of the encoder plate 64, and the positions of the respective phototransistors may be shifted in the circumferential direction of the encoder plate 64. Note that when the minimum unit of angle display is 10 seconds, the number of phototransistors may be 12. 10
6 is an upper cover fixed to the ruler mounting member 20, on which a display lens 108 is arranged;
A display section 28 is disposed below the display lens 108. FIG. 7 is a block diagram of the information processing circuit of this apparatus. In the figure, 110 is an absolute encoder, which includes an encoder plate 64 and a light emitting element 94.
and a light receiving element 96 are the main constituent elements.
In the case of the absolute method, the code on the encoder plate 64 is always set to 1 when compared with the signals before and after itself to avoid errors with adjacent positions.
It uses a code with only bit changes, that is, a unit distance code. Therefore, this unit distance code is converted in a code conversion circuit 114 into a code that is easy to calculate in the next subtraction circuit 112, such as a BCD code. An example of the unit distance code and BCD code is as follows.

【table】

[Table] Reference numeral 116 denotes a preset section, which is constructed so that a BCD code signal can be input by manual operation, and whose main component is a flip-flop circuit. 118 is a display unit drive control circuit; 2
Reference numeral 8 denotes a display section, which is composed of a 7-segment type numeric display circuit using liquid crystal. 120 is A/
The C selection circuit 122 is a selection switch, and these are connected as shown. Next, the operation of this embodiment will be explained. First, turn on the main switch. Next, when you want to change the direction angle of the straightedges 22 and 24,
The operating member 42 is pushed to the left in FIG. 2, and the transmission plate 36 is moved to the left. As the transmission plate 36 moves to the left, the leaf spring 48 moves to the left. At this time, the conical rod 56 is tilted in the counterclockwise direction of rotation of the hour hand, centering on its middle enlarged portion. The switch drive plate 6 is moved by the displacement of the conical rod 56 in the counterclockwise direction of rotation of the hour hand.
6 swings in the counterclockwise direction of rotation of the hour hand in FIG. 3 about the support shaft. This rocking motion of the switch drive plate 66 turns on the limit switch 78, cancels the power saving state, and lights up the light emitting element 94.
On the other hand, due to the displacement of the conical rod 56 in the counterclockwise rotating direction of the hour hand in FIG.
As a result, the ruler mounting member 20 becomes freely rotatable. When the operating member 42 is pushed to the left in FIG.
When the hour hand rotates in the counterclockwise direction around , the tip of the elongated piece 46 pushes the leaf spring 48 downward,
The rising portion of the leaf spring 48 is connected to the second stopper 52.
The transmission plate 36 comes into contact with the left side surface in the figure, and is locked at the leftward movement position. Next, hold the handle 26 with your hand, and
6 and the members 32, 34, main shaft 54, and ruler attachment member 20 are rotated around the board 60, the straight rulers 22, 24 rotate in a plane parallel to the drawing board 4 surface. In conjunction with the rotation of the straightedges 22 and 24, the light receiving element 96 and the light emitting element 94 move along the absolute encoder plate 86, and the encoder 110 outputs a digital signal corresponding to the rotation angle of the straightedge 22, that is, Outputs unit distance code signal. The code of this code signal is converted by the code conversion circuit 114, and the code is converted into BCD.
The coded signal A becomes the coded signal A, and the value of this A is the value of the subtraction circuit 1.
12 and the input side of the A/C selection circuit 120, respectively. On the other hand, the preset value B from the preset section 116 is also input to the subtraction circuit 112, and this B is held in the subtraction circuit 112, so that C=A-B,
This value of C is sent to the A/C selection circuit 120.
The A/C selection circuit 120 sends either the value A or C to the display unit drive control circuit 118 according to the designation of the selection switch 122. As a result, the value specified by either A or C is displayed on the display section 28.
It will be displayed as a decimal value. In this case, A
is the value itself detected by the encoder 110, but C can be arbitrarily changed by the preset value of B, resulting in a double minute function. As shown in FIG. 8, the preset section 116a and the subtraction circuit 11
By increasing the number of switches 2a and the selection function of the selection switch 122a, it is possible to create a triple, quadruple, or other arbitrary multiplex circuit.
Alternatively, the encoder plate may be configured to rotate in accordance with the swinging of the straightedge. Since the present invention is configured as described above, the zero reference of the straightedge can be set at any angular position without actually moving the straightedge to that position and resetting it at that position. For example, if the angle display of the straightedge is +15 degrees and you want to set the zero reference to the state where the straightedge is rotated 90 degrees in the direction of rotation of the hour hand (i.e. in the negative direction), set the value in the preset section to -75. You can set it to . Also,
There are advantages such as the ability to perform multiple degree operations with simple operations.

[Brief explanation of the drawing]

The drawings show a preferred embodiment of the present invention, in which Fig. 1 is an overall plan view, Fig. 2 is a cross-sectional view of the head, Fig. 3 is a plan view showing the internal structure of the head, and Fig. 4 is taken along line A-A. 5 is a plan view of the encoder plate, FIG. 6 is an explanatory diagram of the encoder, FIG. 7 is a block diagram showing the electronic circuit of this device, and FIG. 8 is a block diagram showing another embodiment of the same. It is. 2...Horizontal rail, 4...Drawing board, 6...Horizontal cursor, 8...Vertical rail, 16...Head, 20...
Ruler mounting member, 22, 24...Straight ruler, 26...
Handle, 28...display section, 42...operation member,
56... Conical rod, 60... Board, 64... Encoder plate, 78... Limit switch, 84... Angle brake lever, 64... Encoder plate, 88...
...Slit portion, 90...IC board, 92...Support frame, 94...Light emitting element, 96...Light receiving element, 9
8,100... Ceramic substrate, 102,104
...Lens, 106...Top cover, 108...
Display lens, 110... Absolute encoder, 112... Subtraction circuit, 114... Code conversion circuit, 116... Preset, 118... Display drive control circuit, 120... A/C selection circuit,
122...Selection switch.

Claims (1)

[Claims] 1 A head supported on the drawing board so as to be movable in a predetermined direction along the drawing board surface while maintaining a predetermined orientation, a straightedge rotatably attached to the head, and the straightedge an absolute encoder that converts the rotation angle of the encoder into a digital pulse coded signal, at least one preset section capable of outputting a desired numerical value, and an output numerically coded signal A of the absolute encoder. Subtraction (A-
at least one subtraction circuit that performs B), a selection circuit that receives the output of the subtraction circuit and the output of the absolute encoder, selects and outputs one of these, and the selection circuit A ruler angle display device for a universal parallel ruler, comprising a display unit that numerically displays the output of the ruler.