JPS63118300A - Head section supporter in universal parallel ruler - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

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

Conventionally, this type of device is known to use a spring member to press the head upward, but in this case, the pressing force of the spring member is maximum when the head is on the drawing surface, and the head is Since the head becomes weaker as it moves upward, there is a drawback 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.

SUMMARY OF THE INVENTION Therefore, the present invention provides a head support device for a universal parallel ruler in which the supporting force for supporting the head and scale upward increases as the head moves upward with respect to the drawing surface. It is.

The apparatus of the present invention will be described in detail with reference to the embodiment shown below. Reference numeral 1 denotes a cursor side link, which is integrally fixed onto a cursor plate 2 with a fixing screw 3.

The cursor slope 2 is movably guided by running rollers 5 on a vertical rail 4. Reference numeral 6 denotes a head support link that integrally supports the head section 7, and is connected by a parallel movement mechanism so that it can move up and down substantially parallel to the cursor side link 1. In the embodiment, the upper parts of both links 1.6 are connected to the upper link 8 by pivots 9, 9a, and the lower parts thereof are connected to the lower link 10 by pivots 11.12, as shown in the third figure. A parallel movement mechanism is constructed by arranging the upper link 8 and the lower link 10 such that their pivot axes 9.9a, 11.degree. 12 are located at corner points of a substantially parallelogram.

In addition, in the case of the embodiment, the pivot 11 of the cursor side link 1 of the lower link 10 is provided at the swing end of the swing member 13 that swings about a substantially coaxial position with the pivot 9 of the upper link 8, The adjusting screw 14 provided at the lower end of the swinging member 13 allows adjustment of the parallel motion, and also allows the head support link 6 to be moved out of parallel and largely rotated upward about the pivot shaft 9a. It is composed.

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 support lever 15 is provided at the tip of the support lever 15 as a push-up part. 17 is the provision. The rollers 17 are in contact with the lower surface 6a of the head support link 6. Support lever 1
A spring-loaded shaft 18 is provided at the tip of the support shaft 1.
A push-up spring member 2 biased with tensile elasticity between it and the spring hanging shaft 19 of the cursor side link 1 provided at a substantially horizontal position behind the cursor side link 6.
0 is the default. The push-up blade by the push-up spring member 20 does not work when the spring-hung shafts 18, 19 and the support shaft 16 are aligned in a straight line, and when the support shaft 16 is located above the line connecting the spring-hung shafts 18 and 19. The support shaft 16 is configured to act on the lower surface 6a of the head support link 6 when the support shaft 16 is located below from the line connecting 18 and 19. Further, the push-up blade formed by the push-up spring member 20 is configured so that as the support lever 15 swings upward, the tension angle increases accordingly, so that it acts more heavily on the support lever 15. Further, in order to limit the swing range of the support lever 15, an upper limit stopper 21 that abuts at the upper limit position and a lower limit stopper 22 that abuts at the lower limit position are provided on the cursor side link 1, respectively. When the support lever 15 is in the upper position, the head part and the scale are in a state of floating above the drawing board, and when the support lever 15 is in the lower limit position, the head part and the scale are set in close contact with the drawing surface. It is. Reference numeral 23 designates an interlocking protrusion piece attached to the lower surface of the head support link 6 with a screw 23a so as to come into contact with the roller 17.

On the other hand, in the above-mentioned embodiment of the present invention, a reinforcing head support arrangement is also provided at a position substantially parallel to the head support device. As shown in the rear view in FIG. 4, this configuration is substantially the same as the previous device, including a support lever 15a, a support shaft 16a, a spring 017a, spring hanging shafts 18a and 19a, and a push-up spring member 20.
a, consists of an upper limit stopper 21a and a lower limit stopper 22a, and the action and effect of the support lever 15a are the same,
A slide groove 25 is provided in the interlocking protrusion piece 24 that should be positioned below the roller 17a as the pushing part of the support lever 15a, and it can be moved to the retracted position shown by the solid line in FIGS. 3 and 4 using the setting screw 24a. The structure is such that the mounting position can be changed between the contact position shown by the broken line and the contact position shown by the broken line.

Further, by connecting the interlocking protrusion piece 24 with the operation piece 27 on the head support link 6 via the interlocking member 26 and moving the operation piece 27 from the solid line position shown in the fourth figure to the broken line position, the interlocking protrusion piece 24 By arranging the reinforcing head support device to be in contact with the rollers 17a, it is possible to easily switch between activation and deactivation of the reinforcing head support device.

In FIG. 3, 28 is a guide pin of the interlocking member 26;
is a notch provided in the interlocking member 26 so as to move along the guide bin.

To explain the operating mode of the device of the present invention having the above-mentioned configuration, in the state shown in FIG.
．． 19, the push-up spring member 20 provides a clockwise rotational tendency about the support shaft 16, and the lower limit stopper 22 is in contact with the support. The push-up blade does not act on the head support link 6 from the lever 15, and at this time the head 7 and scale are in close contact with the drawing surface. here,
When the head part 7 is lifted by hand, the interlocking protrusion piece 23 is moved to the roller 1.
7, the support lever 15 is rotated counterclockwise at the same time, and the head section is lifted until the support shaft 16 of the support lever 15 is located below the line connecting the spring hanging shafts 18 and 19. The pushing up force of the pushing up spring member 20 acts on the lower surface 6a of the head support link via the rollers 17. At this time, as the support lever 15 and the head portion 7 move upward, the angle 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. Support lever 1
The head portion 7 and the scale can be supported in a floating state at the position where the head portion 5 abuts the upper limit stopper 21 as shown in the second figure. In addition, since the inclination angle of the drawing board is set close to horizontal, the load on the head and scale increases.
If the head cannot be supported in the floating position by the pressing force of the push-up spring member 20 of the head support device, move the reinforcing interlocking protrusion piece 24 of the head support device to a position where it abuts the roller 17a of the support lever 15a. If fixed, the push-up spring member 20a simultaneously acts on the head support link 6 via the support lever 15a, making it possible to support the head portion and scale at the floating position.

The support shaft 16.16a of the support lever 15.15a is provided on the upper part of the head support link 6, the roller 17 is brought into contact with the cursor side link 1, and the cursor side link 1 is pushed downward by the upward spring member 20.20a. Even if configured to press, the head support link 6 is pressed against the cursor side link 1.
Since the device can be supported upwardly, it is of course possible to implement the device of the present invention with such a design change.

As described above, according to the device of the present invention, the cursor side link 1
When the head support link 6 is supported by a support lever that swings as the head and scale rise, the spring action angle of the push-up spring member that acts on the support lever is Since the structure is such that the spring action force increases as the scale moves upward from the contact position, it is possible to strongly support the head and scale in the floating position, while the spring force is weakened when the head and scale are lowered to the drawing surface. There is an effect that the head portion and the scale can be brought into close contact with the drawing surface by the applied force.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view partially longitudinally showing the main part of an embodiment of the present invention, FIG. 2 is a schematic front view showing its operating mode, and FIG. 3 is a bottom view of the main part. FIG. 4 is a schematic rear view showing other important parts. 1...Cursor side link 2...Cursor plate 4...Vertical rail 6...Head support link 8...Upper link 10...Lower link 15.15a...Support Lever 16.163... Support shaft (swinging fulcrum) 17.17a... Roller (pushing part) 18.18a... Spring hanging shaft (force application point) 19.19a.
... Spring hanging shaft (force application point) 20.20a ... Push-up spring member 21.213 ... Upper limit stopper 22.223 ... Lower limit stopper 23.24 ... Interlocking protrusion piece 25 ...・Slide groove

Claims (1)

[Claims] In a flexible parallel ruler in which a cursor side link and a head support link are connected via a parallel movement mechanism so that the head part and scale are moved up and down approximately parallel to the drawing board surface, the cursor side link and the head support link are connected. A support lever is provided between the link or a member that moves up and down along with the head support link, with one side serving as a swing fulcrum and the other serving as a push-up part, so as to be able to swing freely along the vertical direction of the scale. A push-up spring member is provided between the side and the support lever, and the spring action angle of the push-up spring member with respect to the line connecting the swing fulcrum of the support lever and the force application point of the push-up spring member is set so that the head portion and a head support device for a universal parallel ruler configured to increase as the scale moves upward from the abutting position.