JPH033440Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a head support device for a universal parallel ruler that can support the head and scale above the drawing surface.

Conventionally, this type of device is known to use a spring member to press the head portion upward, but in this case, the pressing force of the spring member is maximum when the head portion is on the drawing surface, and the head portion is As the head becomes weaker as it moves upwards, it has the disadvantage that when the angle of inclination of the drawing board increases with respect to the horizontal, the head part no longer comes into close contact with the drawing board surface.

Therefore, the present invention provides a flexible parallel ruler in which the cursor side link 1 and the head support link 6 are connected via a parallel movement mechanism so that the head part and the scale can be moved up and down substantially parallel to the drawing surface.
A support lever 1 is disposed between the cursor side link 1 and the head support link 6, and is connected to the cursor side link 1 with one end as a swinging fulcrum 16, and the other end as a push-up part 17 contacts the head support link 6.
5 is swingably provided, and a push-up spring member 20 is provided between the spring hook shaft 18 of the link provided with the swing fulcrum 16 and the spring hook shaft 19 of the support lever 15 provided with the push-up portion 17. The supporting force for supporting the scale upward is configured to increase as the head portion moves upward with respect to the drawing surface, and
An auxiliary lever 22 whose one end is connected as a swing fulcrum to a link provided with a swing fulcrum 16 of the support lever 15 next to the support lever 15 and whose other end abuts the support lever 15 as a push-up part 23 is swung. A push-up spring member 26 is provided between the spring-hanging shaft 25 of the link, which is freely provided, and provides the swinging fulcrum of the auxiliary lever 22, and the spring-hanging shaft 24 of the auxiliary lever 22, which is provided with the push-up portion 23. The push-up portion 23 of the lever 22 is configured to be switchable between a position where it abuts against the support lever 15 and reinforces the push-up force of the support lever, and a position where it can be held at the lower limit of its swing, thereby adjusting the inclination angle of the drawing board. In response to this, it is an object of the present invention to provide a head support device for a universal parallel ruler that can selectively increase or decrease the pushing force when the screen is flat or upright.

The present invention will be explained in more detail with reference to the embodiments shown below. Reference numeral 1 denotes a cursor side link, which is integrally fixed onto the cursor plate 2 with a fixing screw or the like.
The cursor plate 2 is movably guided on a vertical rail 4 and a guide rail 3 by running rollers 5. 6
A head support link integrally supports the head portion 7, and is connected to the cursor side link 1 by a parallel movement mechanism so that it can move up and down substantially parallel to the cursor side link 1.

In the case of the embodiment, the upper parts of both the links 1 and 6 are
It is connected to the upper link 8 by pivots 9, 9a, and its lower part is connected to the pivot 1 as shown in the second figure.
1 and 12 to the lower link 10, and arranged so that the respective pivot axes 9, 9a, 11, 12 of the upper link 8 and the lower link 10 are located at corner points of a substantially parallelogram. A parallel motion mechanism is constructed by the following.

Therefore, the head support link 6 is moved by the upper link 8 with respect to the cursor side link 1 by the parallel movement mechanism.
and the lower link 10 will move up and down at the same time.

In the case of the embodiment, the pivot 11 of the cursor side link 1 of the lower link 10 is the pivot 9 of the upper link 8.
A swinging member 13 that swings about a substantially coaxial position with
The adjusting screw 14 provided at the lower end of the swinging member 13 allows adjustment of the parallel movement, and also allows the head support link 6 to be moved out of parallel and upwardly about the pivot 9a. It is constructed so that it can be rotated widely.

Here, in the case of the embodiment of the head support device according to the present invention, a support lever 15 is swingably provided on the cursor side link 1 with a support shaft 16 as a swing fulcrum, and a roller 17 is provided at the tip of the support lever 15 as a push-up part. It is provided. The roller 17 is the lower surface 6 of the head support link 6.
It is in contact with a. A spring hanging shaft 18 is provided at the tip of the support lever 15, and a push-up spring member is applied with tensile elasticity between it and the spring hanging shaft 19 of the cursor side link 1, which is provided at a substantially horizontal position behind the support shaft 16. 20 are provided. The push-up force by the push-up spring member 20 does not act when the spring hanging shafts 18, 19 and the support shaft 16 are located almost on a straight line, and when the support shaft 16 is located above the line connecting the spring hanging shafts 18, 19. In the embodiment, the support shaft 16 is positioned below the line connecting the spring hanging shafts 18 and 19, and a pushing force is always applied to the lower surface 6a of the head support link 6. Furthermore, the upward force exerted by the push-up spring member 20 is configured to greatly act on the support lever 15 as the tension angle increases as the support lever 15 swings upward.

To explain this point with reference to FIG. 4, the support lever 15 rotates at an angle θ around the swing fulcrum 16, and the push-up spring member 20 stretched between the support shafts 18 and 19 pulls the tensile elasticity F at an angle α is applied to the support lever 15, the upward rotational moment M acting on the support lever 15 is M=
If a is the length of the swing fulcrum 16 and the support shaft 18 as L, then a=Lsin α, so the rotational moment M in the push-up direction applied to the support lever 15 is M=FLsin α. Also, as is clear from the figure, the tensile angle α
increases with the upward rotation angle θ of the support lever 15. Therefore, when the tension angle α=0, M=0
For example, when α=5°, M=0.09FL, α=
M=0.17FL when 10°, M= when α=15°
As is clear from the fact that M=0.5FL when 0.26FL and α=30°, the push-up force by the push-up spring member 20 becomes larger as the support lever 15 swings upward along the sine curve. It's getting old. Furthermore, although the length of the push-up spring member 20 decreases as the tension angle α increases, the rate of decrease is small compared to the length of the push-up spring member 20 to which tensile elasticity is applied. The decrease in tensile elasticity that affects the upward force, which increases significantly, can be set within a negligible range.

Further, in the case of the embodiment, in order to limit the upward swing range of the support lever 15, a stopper 21 is provided on the cursor side link 1, with which the rear end protrusion 15a abuts at the upper limit position. And the support lever 15
When the support lever 15 is at the upper limit position, the head portion and scale are in a state of floating above the drawing board, and when the support lever 15 is at the lower limit position, the head portion and the scale are set in close contact with the drawing surface.

On the other hand, in the above embodiment of the present invention, a reinforcing head support device is provided at a position substantially parallel to the head support device. This configuration is shown in Figures 3a to 3.
As shown in Figure d, the auxiliary lever 22, the support shaft 16, the push-up part 23, and the spring hanging shaft 2 are almost the same as the previous device.
4, 25, a push-up spring member 26, and a stopper 21, and the push-up part 23 is configured to abut against the lower surface of the support lever 15.

That is, the auxiliary lever 22 uses the support shaft 16 as a swing fulcrum, and when the line of action of the push-up spring member 26 is located above the swing fulcrum (as shown in figures 3a and 3b), the push-up part 2
3 is in contact with the lower surface of the support lever 15 to reinforce the pushing force of the support lever 15, and when the line of action of the push-up spring member 26 is located below the swing fulcrum (the third
c, 3d shown), the auxiliary lever 22 is held at the lower limit position where it contacts the stopper 21 by the tensile elasticity of the push-up spring member 26, and the push-up portion 23 is held at the lower limit position where it contacts the stopper 21.
It is configured to be held below. Furthermore,
The reinforcing lever 22 is integrally provided with an operating piece 22a, and is configured such that the line of action of the push-up spring member 26 can be selectively set above or below the support shaft 16. Further, in the case of the embodiment, the above-mentioned head support device is attached to a mounting board 28 which is attached to the cursor side link 1 with fixing screws 27, and is configured to be detachable.

To explain the operating mode of the device of the present invention having the above-mentioned configuration, in the state shown in FIG. Since it is located slightly below the line, the push-up spring member 20 provides a small rotational tendency in the counterclockwise direction about the support shaft 16, and a push-up force is applied from the support lever 15 to the head support link 6. is in a state where it acts only slightly, and at this time the head 7 and the scale are in close contact with the drawing surface. When the head section 7 is lifted by hand, the support lever 15 is also rotated counterclockwise at the same time, and as explained with reference to FIG. As the head is located further down from the line, the upward force of the upward force of the upward spring member 20 acts more strongly on the lower surface 6a of the head support link 6 via the rollers 17. That is, as the support lever 15 and the head portion 7 move upward, the angle formed between the push-up spring member 20 and the support lever 15 increases, so the spring elastic force acting on the support lever 15 from the push-up spring member 20 also increases. As shown in FIG. 3d, the support lever 15 can support the head portion 7 and the scale in a floating state at a position where it abuts against the stopper 21.

In addition, since the inclination angle of the drawing board is set close to horizontal, the acting force of the load on the head portion and the scale increases, causing the upward spring member 2 of the head support device to
If the head cannot be sufficiently supported in the floating position with only a pressing force of 0, lift the auxiliary lever 22 of the reinforcing head support device upward from the stopper 21 and press the push-up part as shown in FIGS. 3a and 3b. 23 is rotated to a position where it contacts the lower surface of the support lever 15, the push-up spring member 26 simultaneously acts on the head support link 6 via the support lever 15, supporting the head and scale in the floating position. That will happen.

Note that the cursor side link 1 and the head support link 6, which are connected by a parallel movement mechanism, are in a relationship that allows them to move relative to each other up and down while maintaining parallelism with each other. When connected, link 6 becomes the cursor side link, and when link 1 is connected to the head, link 1 becomes the head support link. Therefore, for example, the third a
If the device of the present invention shown in the figure is removed as shown in FIG. 3b, then reversed as it is, and the link 6 is fixed to the cursor 2 and the link 1 is fixed to the head part 7, the support lever 15 and the auxiliary lever 22 can be The support shaft 16 is located on the head support link side, and the roller 17, which is a push-up part, is brought into contact with the cursor-side link, and by pressing the cursor-side link downward with the push-up spring members 20 and 26, Since the head support link side is moved upward and the head support link can be supported upwardly relative to the cursor side link, it is of course possible to implement the device of the present invention with such design changes. .

As described above, according to the device of the present invention, the cursor side link 1 and the head support link 6 are connected via the parallel movement mechanism so that the head portion and the scale are moved up and down substantially parallel to the drawing surface. In this flexible parallel ruler, one end is connected to the cursor side link 1 as a swinging fulcrum 16 between the cursor side link 1 and the head support link 6, and the other end is used as a push-up part 17 and touches the head support link 6. In addition to providing a supporting lever 15 in contact with each other so as to be swingable,
a spring hanging shaft 18 of a link provided with a swinging fulcrum 16;
Spring hanging shaft 1 of support lever 15 provided with push-up part 17
9, when the head support link 6 is supported with respect to the cursor side link 1 by the support lever 15 which swings as the head section and the scale rise, The spring action angle of the push-up spring member 20 acting on the support lever 15 increases as it moves upward from the position where the head part 7 and the scale contact the drawing surface, and the spring action force increases, causing the head part and the scale to The supporting lever 15 can be strongly supported in the floating position, while when descending to the drawing surface, the head part 7 and the scale can be brought into close contact with the drawing surface by the weakened spring acting force.
Next to this, an auxiliary lever 22 is swingably provided, one end of which is connected as a swing fulcrum to a link provided with a swing fulcrum 16 of the support lever 15, and the other end of which contacts the support lever 15 as a push-up part 23. , furthermore,
The auxiliary lever 22 includes a spring-loaded shaft 25 of a link that provides a swinging fulcrum for the auxiliary lever 22, and a push-up portion 23.
A push-up spring member 26 is provided between the push-up spring member 26 and the spring-hanging shaft 24 of the auxiliary lever 22, and the push-up portion 23 of the auxiliary lever 22 is placed in a position where the push-up portion 23 of the auxiliary lever 22 is brought into contact with the support lever 15 to reinforce the push-up force of the support lever 15, and at its lower limit swing position. Since it is configured so that it can be switched to a position where it can be held, the load on the head and scale increases, as in the case where the inclination angle of the drawing board is set to a nearly horizontal state, and the set of head support levers 15 In cases where the load cannot be supported, the supporting force of the head can be greatly increased by the reinforcing auxiliary lever 22, so that it can be adjusted to the inclination angle of the drawing board even when the screen is flat. This has the effect that the floating support operation of the head section can be performed in an optimal state even when the screen is on.

[Brief explanation of drawings]

Fig. 1 is a schematic plan view showing the main parts of an embodiment of the present invention, Fig. 2 is a bottom view of the main parts, and Figs. 3a to 3d are schematic front views showing the operating mode of the main parts. FIG. 4 is an explanatory diagram illustrating the principle of the operation of the main parts of the device of the present invention. 1: Cursor side link, 2: Cursor board, 4:
Vertical rail, 6: Head support link, 8: Upper link, 10: Lower link, 15: Support lever, 1
6: Support shaft (swinging fulcrum), 17: Roller (pushing part), 1
8, 19: Spring hanging shaft (force application point), 20: Push-up spring member, 21: Stopper, 22: Auxiliary lever, 2
3: Push-up part, 24, 25: Spring hanging shaft, 26: Push-up spring member, 28: Mounting board.

Claims (1)

[Scope of utility model registration request] A flexible parallel ruler in which a cursor side link 1 and a head support link 6 are connected via a parallel movement mechanism so that the head part and scale are moved up and down substantially parallel to the drawing surface. A support lever 15 is provided between the head support link 6 and the support lever 15, which is connected to the cursor-side link 1 with one end as a swing fulcrum 16 and the other end is a push-up part 17 and abuts on the head support link 6. In addition, a spring hanging shaft 18 of the link is provided with a swing fulcrum 16, and a support lever 15 is provided with a push-up portion 17.
A push-up spring member 20 is provided between the support lever 15 and the spring hanging shaft 19.
An auxiliary lever 22 is swingably provided, one end of which is connected to the link provided with the swing fulcrum 16 of No. 5 as a swing fulcrum, and the other end of which contacts the support lever 15 as a push-up part 23. The spring hanging shaft 25 of the link provided with a swinging fulcrum, and the push-up part 23
A push-up spring member 26 is provided between the auxiliary lever 22 and the spring hanging shaft 24, and the auxiliary lever 22
A head part support in a universal parallel ruler configured to be switchable between a position where the push-up part 23 of the support lever 15 is brought into contact with the support lever 15 to reinforce the push-up force of the support lever 15, and a position where the push-up part 23 of the support lever 15 can be held at its lower limit position. Device.