JPS5979B2 - Head connection device for track type flexible parallel rulers, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a head connecting device for a track type universal parallel ruler and the like.

Conventionally, devices of this kind have been known that employ a parallel link mechanism or a parallel motion cam mechanism so that the scale floats parallel to the drawing surface when the scale is lifted from the drawing surface. However, in such a device, not only is the structure itself complicated, but it is also necessary to break the parallelism so that the scale can stand up with the head, and to exchange drawings and clean the drawing surface. A new configuration was also required.

Therefore, the present invention investigated the operating state of a conventionally known head connecting device in which a cursor side support part and a head side support part are connected by first and second pivot shafts at both ends of an intermediate link. As a result, we have developed a device that can lift the scale approximately parallel to the drawing board surface with an extremely simple configuration.The feature of this configuration is that the intermediate link and the head side support part are rotatably connected. An elastic member is installed around the pivot shaft to apply an elastic force in the direction of the rotational force that causes the head side support part to float upward relative to the intermediate link, and its action and effect is to float the head and scale. The purpose is to increase the elastic force accordingly and assist the parallel floating action of the scale.

The present invention will be described in detail with reference to the illustrated embodiments below.
1 and 2, 1 is a vertical rail, 2 is a cursor plate guided along the lower surface of the vertical rail 1, 3 is a cursor side support part integrally provided on the cursor plate 2, and 4 is the above-mentioned cursor side support part. An intermediate link 6 is pivotally attached to the cursor side support part 3 by a pair of first pivot shafts 5, and 6 is pivotally attached to the intermediate link 4 by a pair of second pivot shafts 7. 6a is a head support member detachably fixed to the head support member 6; 8 is an operation head rotatably supported by the head support member 6a; 9 is an operation head 8 10 is a scale support board that also rotates together with the operating head 8; 11 is an L-shaped scale mounting plate attached to the scale support board 10; 12 is an X and Y scale attached to the scale mounting plate; 1
Reference numeral 3 denotes a protractor, and 14 denotes a vernier scale. The configurations of the above-mentioned members are conventionally known.

When the bottom 9a of the head bottom 9 is in contact with the surface of the drawing board 15, the X, Y scale 12 is also configured to be in close contact with the surface of the drawing board.

In the universal parallel ruler having the above configuration, the head connecting device according to the present invention has the following features, as shown in FIGS. 3 to 5:
An elastic member 16 is installed around the second pivot shaft 7 to enhance the elastic force of the head side support part 6 in the floating direction with respect to the intermediate link 4 when the head side support part 6 is floated together with the intermediate link 4. It is.

That is, in the case of the embodiment, the elastic member 16 is made of an elastic wire such as a piano wire, and is wound around the second pivot shaft 7 to apply an elastic force to the tip end 16a of the elastic member 16 so that the head side support portion 6 is The rear end 16b is engaged around the first pivot shaft 5 while being brought into contact with the inner wall.

Therefore, as shown in FIG. 6, with the rotation of the intermediate link 40 about the first pivot shaft 5, the head side support part 6 is kept parallel from the state (A) to the state (B). When it is floated, the angle between the intermediate link 4 and the head-side support part 6 about the second pivot shaft 7 is gradually narrowed, and the elastic force of the elastic member 160 is accordingly increased. , the elastic force of the head-side support portion 6 in the floating direction with respect to the intermediate link 4 increases.

By the way, a head and a scale are integrally attached to the head side support part, and as shown in FIG. 2, these heads and scales act as an uneven load on the second pivot shaft 7, so that the state shown in FIG. 6 occurs. When floating the head side support part 6 as shown in (B), the second pivot shaft 7 in the figure
There is a strong possibility that the head-side support part 6 will rotate clockwise around the center, and the tip of the scale will tilt toward the drawing surface.
6 prevents the tip of the scale from tilting toward the drawing surface due to the elastic force that increases as the scale floats up.

Further, as shown in FIG. 5, in the case of the embodiment, the first and second pivot shafts 5 and 7 are screwed into the cursor side support part 3 and the head side support part 6, respectively, with screw shaft parts. The tip of the tip is connected to the pivot ball bearings 5a and 7a of the intermediate link 4, respectively.
It is forced to come into contact with.

Additionally, reference numerals 17 and 18 denote stoppers provided on the cursor side support section 3 and the head side support section 6, respectively, and as shown in FIG. 4, end frames 19a before and after the intermediate link 40.

19b, the intermediate link 40 rotates at its limit position (upright position) with respect to the first pivot shaft 5, and the head side support part 60 rotates at its limit position with respect to the second pivot shaft 7 (reversed position of the scale and head). ).

According to the apparatus of the present invention, when an attempt is made to float the scale 12 upward in parallel with the operating head 8 from the position where the scale 12 in FIG. 2 is in close contact with the surface of the drawing board 15, the operating head The head side support part 6 tries to rotate clockwise around the second pivot shaft 7 due to the unbalanced load, but the elastic member 16 provided on this pivot shaft 7 reversely rotates the head side support part 6 This is prevented by applying an elastic force in the clockwise direction, and by the elastic force that increases as the scale floats, the scale floats almost parallel while remaining parallel or with the tip slightly higher. I will do it.

The transition from the floating limit of the parallel state to the upright and inverted state of the scale shown in FIG. 4 is also carried out extremely smoothly by the resilient force of the elastic member 60.

Also, when the scale is moved from the upright and inverted state shown in FIG. Then, the scale can be brought into close contact with the drawing surface while gradually weakening the elastic force.

Further, the elastic force of the elastic member 6, which increases as the scale floats up, serves to alleviate the impact force generated by fairly rapid scale operation.

As described above, the head coupling device according to the present invention has a complicated configuration that mechanically restricts the parallel floating of the scale using the conventional parallel link mechanism, parallel cam mechanism, etc.
A second pivot rotatably connects the cursor side support part and the head side support part with the first and second pivot shafts via the intermediate link, and connects the intermediate link and the head side support part. An elastic member made of elastic wire is wrapped around the shaft,
A resilient force is applied to the tip end 16a of the elastic member to bring it into contact with the inner wall of the head side support part, while the rear end 16b
When the head side support part is floated together with the intermediate link, the elastic force of the elastic member toward the head side support part is proportional to the above-mentioned elastic member. As a result, a parallel movement mechanism of the scale can be obtained.

Incidentally, in the conventional head connecting device, a device is known in which an elastic member such as a leaf spring is provided between the cursor side support portion and the intermediate link and/or the head side support portion, but none of these conventional devices This mechanism is designed to offset the loads on the head and the scale to actually lighten the floating of the scale, and is similar to the parallel motion mechanism of the present invention.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a front view showing a partially longitudinally sectional configuration of the main part thereof. FIG. 4 is a front view partially showing the operation mode of the main part, FIG. 5 is an enlarged plan view partially showing the main part cross-sectionally, and FIG. 6 is a detailed explanation of the present invention. It is an explanatory diagram. 1: Vertical rail, 2 cursor plate, 3: Cursor side support section, 4: Intermediate link, 5: First pivot axis, 6: Head side support section, 72 Second pivot axis, 8: Operation head, 1
2: X, Y scale, 15: Drawing board, 16: Elastic member, 1
7.18: Stopper.

Claims (1)

[Claims] 1. A cursor side support part that moves along the vertical rail and one end of the intermediate link are rotatably connected by a first pivot shaft, and the other end of the intermediate link and the cursor side support part are rotatably connected. are rotatably connected by a second pivot shaft, an elastic member made of an elastic wire is wound around the second pivot shaft, and a resilient force is applied to the tip 16a of the elastic member. When the rear end portion 16b is engaged around the first pivot shaft and the head side support portion is floated together with the intermediate link, the elastic member A head connecting device for a track-type flexible parallel ruler, etc., which is configured to increase the elastic force applied to the head-side support portion.