JPH0547680Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a drawing plate inclination angle detection device for a universal parallel ruler.

[Conventional technology]

This type of drawing board inclination angle detection device was developed by the Special Publication Corporation in 1973.
As shown in Publication No. 38967, it is electrically detected using a strain gauge.

[Problem that the invention attempts to solve]

If the inclination angle of the drawing board was to be detected electrically, the structure would be complicated and expensive.
SUMMARY OF THE INVENTION An object of the present invention is to provide a drawing board inclination angle detection device that has a simple structure and can be manufactured at low cost.

[Means to solve problems]

In order to achieve the above object, the present invention provides a universal parallel ruler that is installed on a drawing board and configured to allow scale balancing force and head floating force to be adjusted manually. An inclinometer consisting of a pointer pointing in the direction of gravity and an angle display section provided in the movement path of the pointer is provided at the bottom of the inclinometer, and the angle display section of the inclinometer locks the head at the upper limit position. The position of the pointer is set so as to indicate the angle of inclination of the drawing board.

[Effect]

When the inclination angle of the drawing board changes, the pointer points in the direction of gravity, so the angle display section side is displaced relative to the pointer, and the interaction between the pointer and the angle display section displays the inclination angle of the drawing board. . The angle display section is set to display the inclination angle of the drawing board when the head is raised and locked to the stopper. After reading the inclination angle of the drawing board, the operator adjusts the scale balance force and head floating force in accordance with the inclination angle.

〔Example〕

In FIG. 8, reference numeral 2 denotes a drawing board, which is supported by a support frame of a drafting table which can be tilted so that a desired angle of inclination can be set between horizontal and vertical. 4 is a horizontal rail fixed to the upper edge of the drawing board 2, and a horizontal cursor 6 is movably attached to this rail. The upper end of a vertical rail 8 is connected to the horizontal cursor 6 so as to be rotatable about an axis horizontal to the horizontal rail 4. The lower edge of the vertical rail 8 is placed on the drawing board 2 via tail rollers so as to be freely movable. 1
A vertical cursor 2 is movably attached to the vertical rail 8, and a support board 18 of the head 16 is connected to this through a known head lifting/lowering support device 14. As shown in FIG.
A tubular double shaft 20 is fixed to the tube portion 8 with a nut. Reference numeral 22 denotes a tubular main shaft, the outer peripheral surface of which is rotatably fitted into the inner peripheral surface of the multi-shaft 20, and a mounting plate 24 is fixed to the upper part of the main shaft 22. A handle 26 is fixed to the mounting plate 24. 28 is a scale mounting plate fixed to the flange of the main shaft 22, and the scales 30, 32 are fixed to this. 34 is the mounting plate 2
4, and a tubular first rotating body 36 is rotatably fitted to the inner peripheral surface of the tubular body.
A belt pulley 36a having teeth for a timing belt is fixed to the lower part of the rotating body 36. A screw hole is formed in the side wall of the rotating body 36, and the rotating body 36 is fixed to the tube body 34 by a fixing screw 38 that is threaded into the screw hole. 40 is a cylindrical second rotating body, a feed screw 42 is installed and fixed in the diametrical direction of the rotating body 40 in the middle part thereof, and an adjustment molding 44 is attached to the screw 42.
are screwed together. An outer ring of a ball bearing 46 is fitted and fixed to the inner diameter portion of the rotating body 40, and an inner ring of the ball bearing 46 is fitted and supported on a shaft 47 fixed to the support substrate 18. In the guide space of the rotating body 40, a bridge member 50 rotatably fitted into the recessed portion of the molding 44 is arranged so as not to rotate. A flexible and bendable wire rope 54 is attached to the protrusion of the bridge member 50.
A metal fitting terminal 54a connected to one end of is rotatably fitted. A belt pulley with teeth for a timing belt is formed on the outer periphery of the rotating body 40, and the belt pulley and the belt pulley 36 are connected to each other.
A timing belt 56 is stretched between a. 58 is a coil spring, one end of which is connected to the support substrate 1.
8, and the rope 54 is connected to the other end.

The coil spring 58 is attached to the scale mounting plate 2.
8. The second rotating body 40 is biased in a direction that offsets the rotational torque generated in the first rotating body 36 due to the weight of the scales 30, 32, etc. 70 is an angle display formed on the rotating body 40, and an indicator 7 formed on the piece member 50.
2 on the axial movement line. The angle display 70 displays the angle of the drawing board. 7
Reference numeral 3 denotes a pointer consisting of a weight rotatably fitted to the lower end of the main shaft 22, and one end of which protrudes into an arc-shaped window 7 formed in the bottom cover 74 of the head 16.
It is loosely fitted into 5. An angle display section 77 is formed in the arc-shaped window 75. When the head 16 is rotated until it is stopped by the stopper S as shown in FIG. The angle display section 77 is set so as to.

Next, the head floating device will be explained in detail with reference to FIGS. 3 to 6.

The head lifting and lowering support device 14 includes links 76 and 78.
One side of the plate-shaped link 76 has a support member 12a fixed to the vertical cursor 12 rotatably in a plane perpendicular to the two planes of the drawing board by means of pivot shafts 80 and 82. is supported by. One end of the link 78 is rotatably supported by a shaft 84 on the support member 12a within a plane perpendicular to the two surfaces of the drawing board. The rising portion of the support substrate 18 is aligned with the pivot axis 8 parallel to the pivot axes 80 and 82.
6 and 88, the link 76 is rotatably connected to both sides of the other end of the link 76, and the lower part of the support substrate 18 is connected to the shaft 9.
1 is rotatably connected to the other end of the link 78. The links 76 and 78 constitute a known parallelogram linkage. 90 is link 76
A recessed portion 92 formed in the upper plate portion in a direction parallel to the horizontal rail 4 is a molding arrangement hole formed in the link 76 , and a threaded rod 94 is arranged in the recessed portion 90 . The tip of the link 76 is rotatably fitted into a hole 93 formed in the link 76. A molding 96 rotatably disposed within the hole 92 is fixed to one end of the threaded rod 94. Both side surfaces of the molding 96 are configured to slidably abut against the wall surface of the hole 92, and the threaded rod 94 is prevented from moving in its longitudinal direction by the wall surface of the hole 92. Reference numeral 98 is a bridge member disposed within the recessed portion 90, and a screw hole thereof is screwed into the threaded rod 94. Both sides of the bridge member 98 are provided with recessed portions 90.
The bridge member 98 is slidably in contact with a guide surface in a direction parallel to the horizontal rail 4, and the upper end surface of the bridge member 98 is slidably and resiliently contacted with the bottom surface of the recessed portion 90, whereby the bridge member 98 is in contact with the threaded rod 94. It works in conjunction with rotation to prevent it from rotating. 99 is the support member 12a
A cylindrical body whose lower end is rotatably supported by a shaft 101 on the wall surface of the notch, with its lower end being rotatably centered on an axis parallel to the two planes of the drawing board, and a cylindrical rod slidably disposed within the cylindrical body 99. 104 is biased by the elasticity of the coil spring 100 in a direction protruding from the cylindrical body 99. The upper end protrusion of the rod 94 is connected to the plate member 9.
It is rotatably fitted into the recess formed in 8.
In addition, the screw rod 94, the knob 96, the bridge member 98,
The rod 104 constitutes a mechanism for changing the point of action of the spring 100 on the link 76 with respect to the center of rotation of the link 76, but this mechanism is not particularly limited to the illustrated configuration. Said mall 96
An angle indicator 110, for example, 0 degrees, 45 degrees, and 90 degrees, is formed on the angle indicator 110, and the angle indicator 110 faces an indicator 112 formed on the upper surface of the link 76.

Next, the operation of this embodiment will be explained.

When using the universal parallel ruler, the user sets the inclination angle of the drawing board 2 so that it is most convenient for use.
The inclination angle of the drawing board 2 can be determined by looking at the angle display 77 corresponding to the rest position of the pointer 73 while the head 16 is in an upright state until it is locked by the stopper as shown in FIG. Can be done.

Next, the user rotates the molding 44 of the scale balance device and reads the indicator 72 on the molding 44 to display the angle display 7 corresponding to the inclination angle of the drawing board 2.
0, and rotate the molding 96 of the head floating device to align the angle display 110 corresponding to the read inclination angle of the drawing board 2 with the index 112.

Next, the head 16 is lowered onto the drawing board 2.

In a state where the drawing board 2 is tilted at a predetermined angle and the scale mounting plate 28 is freely rotatable with respect to the support substrate 18, the scale mounting plate 28, the scale 3
A rotational torque T about the main shaft 22 is generated in the first rotating body 36 due to its own weight of 0.0, 32, etc. The magnitude of this rotational torque T and the rotational torque T' acting on the second rotary body 40 due to the elasticity of the coil spring 58 are set to be the same, and their directions are opposite. Therefore, the scale mounting plate 28 is the inclined drawing plate 2.
There is no sudden rotation with respect to the support substrate 18 on the top. By rotating the handle 26, the scale mounting plate 28 can be rotated 360 degrees.
Therefore, the scales 30 and 32 are attached to the support substrate 1 of the head.
Even if the scales 30 and 32 are set at a desired angle with respect to the tilted drawing board 2 and the handle 26 is released, the scales 30 and
Maintain a stable stationary position relative to the head at the top. Scale 30,3 by manual rotation of handle 26
When the second rotating body 40 rotates as the second rotating body 2 rotates, the rotational torque T' caused by the coil spring 58 of the rotating body 40 changes according to a sine curve. Since the rope 54 does not get caught on the rotating body 40 even if the second rotating body 40 rotates 360 degrees or more, the scale mounting plate 28 can be rotated any number of times.

Next, the operation for adjusting the magnitude of the rotational torque T' will be explained.

When the molding 44 is rotated, the molding 44 moves along the feed screw 42, and thereby the piece member 50 moves along the feed screw 42. Due to the movement of the piece member 50, one end 54a of the rope 54 is moved to the second rotating body. 40 in its radial direction. As the one end 54a of the rope moves relative to the rotating body 40, the distance between the center of the rotating body 40 and the point of action of the spring, that is, the radius as a rotational torque generating element changes, and the rotational torque T' of the rotating body 40 changes. Change.
When the inclination angle of the drawing plate 2 is changed, the value of the load W applied to the center of gravity of the scale mounting plate 28 due to the weight of the scales 30, 32, etc. changes in accordance with this change. When the drawing board 2 is vertical, the above load W
is maximum, and when drawing board 2 is horizontal, the above load W
becomes zero. Therefore, when changing the inclination angle of the drawing board 2, the load W can be adjusted by rotating the molding 44 and aligning the indicator 72 with the angle display 70 corresponding to the inclination angle of the drawing board. 1st
Due to the tensile load of the coil spring 58, the second rotating body 40 is
It is possible to match the magnitude of the rotational torque T′ generated at the two positions. In addition, the handle 26a of the head 16
When grasped by hand and pulled up in the upward direction, the links 76 and 78 will move against the pivot shafts 80 and 82 and the shaft 84.
9, the open ends of the links 76 and 78 rise relative to the second surface of the drawing board, and the head 16 becomes approximately parallel to the second surface of the drawing board. Rise while holding. arbitrary head 1
When the hand is released from the handle 26 at the 6-up position, the weight of the head 16 generates a rotational torque T' in the link 76 about the pivot shafts 80, 82 in the direction of rotation of the hour hand in FIG. The rotational torque T' and the rotational torque T acting on the link 76 via the bridge member 98 due to the elasticity of the spring 100 are approximately the same in magnitude, and are opposite in direction. Therefore, when the head 16 is released from the hand, it is almost balanced at an arbitrary raised position and will not fall due to its own weight. Incidentally, the elastic force of the rod 104 may be applied to the link 78 in the direction in which the head 16 floats.

Next, the operation of adjusting the distance between the center of rotation of the link 76 and the point of action of the spring 100 will be described.

When the molding 96 is rotated, the screw shaft 94 is rotated. As a result, the bridge member 98 moves along the guide surface of the recessed portion 90, and the other end of the rod 104 moves in the direction of the head on the link 76 in conjunction with the bridge member 98. As the bridge member 98 moves, the distance between the center of rotation of the link 76 and the point of impact of the rod 104 changes. When the inclination angle of the drawing board is changed, the value of the load W applied to the link 76 due to the weight of the head or the like changes in accordance with this change.
Therefore, when changing the inclination angle of drawing board 2,
The angle of inclination is read by the angle display 9 of the holder body 3, and by rotating the molding 92 and aligning the angle display 110 corresponding to the inclination angle of the drawing board with the index 112, the load W can be read. The elastic force of the spring 100 causes the link 7 to
It is possible to match the magnitudes of the rotational torques T generated in the rotational torques T.

〔effect〕

As mentioned above, in this invention, since the drawing board angle detection device is located at the bottom of the head, the device does not disturb the user during drawing, and it can be manufactured at low cost, and the inclination angle of the drawing board can be easily adjusted. There is an effect that can be read as follows.

[Brief explanation of the drawing]

Fig. 1 is a sectional view, Fig. 2 is a bottom view, Fig. 3 is a sectional view, Fig. 4 is a BB sectional view, Fig. 5 is a C-C sectional view, Fig. 6 is a plan view, and Fig. 7 is a sectional view. The figure is a plan view, FIG. 8 is a plan view, and FIG. 9 is a side view. 2... Drawing board, 3... Holder body, 4... Horizontal rail, 6... Horizontal cursor, 6'... Vertical rail mounting board, 5... Sphere guide hole, 7... Sphere, 9... Angle display , 12...Vertical cursor, 14...Head elevation support device, 16...Head, 18...Support board,
20...Multi-shaft, 22...Main shaft, 24...Mounting plate,
26...Handle, 28...Scale mounting plate, 3
0,32...Scale, 36...Rotating body, 40...
... Rotating body, 44 ... Mall, 50 ... Piece member, 5
2...Long hole, 54...Wire rope, 58...Coil spring, 62, 64...Rope guide, 70...
... Angle display, 73 ... Pointer, 72 ... Index, 74
... Bottom cover, 75 ... Window, 77 ... Angle display section, 76, 78 ... Link, 80, 82 ... Pivot shaft, 86, 88 ... Pivot shaft, 96 ... Mall, 98 ... Piece member , 104... Rod, 11
0... Angle display, 112... Index.

Claims (1)

[Scope of utility model registration request] In a universal parallel ruler that is attached to a drawing board and configured to allow scale balancing force and head floating force to be adjusted manually, the direction of gravity is oriented at the bottom of the head of the universal parallel ruler. An inclinometer consisting of a pointer and an angle display section provided on the movement path of the pointer is provided, and the angle display section of the inclinometer is set such that the position of the pointer is as shown in the figure when the head is locked at the upper limit position. 1. A drawing board inclination angle detection device for a universal parallel ruler, characterized in that the device is configured to display the inclination angle of the drawing board.