JPH0232474Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a rail type flexible parallel ruler.
The present invention relates to a vertical brake operating device that fixes and releases a vertical cursor from a vertical rail. In conventional vertical brake operating devices, the operating lever for fixing and unfixing the vertical cursor is generally structured to protrude a predetermined length from the side of the vertical cursor 10 adjacent to the head. In this case, if the operating lever is made longer and the distance between its center of rotation and the open end of the operating lever is increased, the amount of change in position of the open end of the operating lever between when the vertical cursor is fixed and when it is released will increase. There was a defect in that the fingers of the hand holding the head could not reach the operating lever, making it impossible to easily operate the operating lever.

The present invention aims to eliminate the above defects.

The configuration of the present invention will be described in detail below based on embodiments shown in the accompanying drawings.

2 is a drawing board, and 4 is a horizontal rail which is attached to the upper end of the drawing board 2 with a fixture. A horizontal cursor 6 is movably attached to the horizontal rail 4 via rollers. 8 is a vertical rail whose upper end is attached to the horizontal cursor 6 and is disposed at right angles to the horizontal rail 4. A vertical cursor 10 is movably attached to the vertical rail 8 via rollers 12, 14, and 16, and a head 18 is connected to the rising portion of the cursor via a hinge connecting member. Straightedge 2 on the mounting plate
0 and 22 are fixed. 24 is vertical cursor 1
The swing arm is rotatably supported by a shaft 26, and a brake shoe 28 is fixed to a rising portion at one end of the swing arm. 30 has one end connected to the swinging arm 24.
This is a swinging arm rotatably connected to the other end by a shaft 32, and a brake shoe 34 is fixed to the rising portion of the other end. The brake shoes 28, 34 are opposed to brake rail surfaces 36, 38 formed on the vertical rail 8 over its entire length in the longitudinal direction, as shown in FIG. The swing arms 24 and 30 are given elasticity by a spring 40 in a direction in which their open ends move away from each other. 42
is an L-shaped operating lever, one end of which is rotatably supported by the vertical cursor 10 on a shaft 44.
46 is a plate-shaped cam member rotatably supported by a shaft 48 on the vertical cursor 10 so as to face the side surface of the swing arm 30, and a brake applying surface 50 and a brake releasing surface 52 are formed on this cam member. . An elongated hole 54 is provided in the bent portion of the operating lever 42, and a shaft 56 protruding from the protruding portion 46a of the cam portion 46 is slidably fitted into the elongated hole 54. The elongated hole 54 is set so that its longitudinal direction is substantially perpendicular to the rotation locus line about the axis 44 . The distance A between the shafts 48 and 56 and the distance B between the shafts 56 and 44 have a relationship of A<B, whereby the rotation angle of the cam member 46 is smaller than the rotation angle of the operating lever 42. It constitutes a rotation angle amplification mechanism that increases the rotation angle. That is, the rotation angle of the operating lever 42 is amplified and transmitted to the cam member 46.

Next, the operation of this embodiment will be explained.

When the handle portion 42a of the operating lever 42 is swung in the direction A perpendicular to the longitudinal direction of the vertical rail 8 about the shaft 44 in the direction of rotation of the hour hand in FIG.
Due to the displacement of the elongated hole 54 due to this rocking, the cam member 46 rotates about the shaft 48 in the counterclockwise rotation direction in FIG. Press the side of the to the left. Due to this pressing force, the swinging arm 24 rotates about the shaft 26 in the rotation direction of the hour hand in FIG.
6, the swinging arm 30 rotates about the shaft 32 in the counterclockwise direction of rotation of the hour hand in FIG.
4 is pressed against the brake rail surface 35, and the vertical cursor 10 is fixed to the vertical rail 8. The rotational movement of the hour hand about the shaft 44 of the rotating part of the lever 42 is smaller than the rotation angle of the operating lever 42,
Since the rotation angle is transmitted to the cam member 46 via the rotation angle amplification mechanism that increases the rotation angle of No. 6, the required swing amount (rotation angle) of the operating lever 42 is shortened. Next, the handle portion 42a of the operating lever 42 is pushed in the direction of the arrow B in FIG.
When the cam member 46 rotates in the counter-rotational direction of the hour hand about the shaft 48, the cam member 46 rotates in the direction of rotation of the hour hand in FIG. parallel to and opposite to. As a result, the pressing force of the cam member 46 on the swinging arm 30 is released, and the swinging arms 30 and 24 move away from each other due to the elasticity of the spring 40 until they are locked to a stopper surface (not shown). Moving. This releases the brake shoes 28, 34 from being pressed against the brake rail surfaces 36, 38, and the vertical cursor 10 becomes freely movable along the vertical rail 8.

Note that the rotation angle amplifying mechanism described above can have various structures. For example, as shown in FIG. It is also possible to configure a rotation angle amplification mechanism in which the rotation angle of the cam member 64 is larger than the rotation angle of the operation lever 60 by adjusting the gear ratio by meshing these with each other. The rotation angle amplifying mechanism that makes the rotation angle of the cam member larger than the rotation angle of the operating lever is not particularly limited to the illustrated structure. Further, the brake mechanism may have any structure as long as it is operated by rotational displacement of the cam member.

Since the present invention is configured as described above, the swing range (rotation angle) of the operating lever can be shortened, so that the operating lever can be easily operated.

[Brief explanation of the drawing]

The figures show a preferred embodiment of the present invention, in which Fig. 1 is an overall plan view, Fig. 2 is a plan view of main parts, and Fig. 3 is a plan view of the main part.
4 is a sectional view of the same, and FIG. 5 is a sectional view showing another embodiment. 2...Drawing board, 4...Horizontal rail, 6...Horizontal cursor, 8...Vertical rail, 10...Vertical cursor, 18
... Head, 20, 22 ... Straight ruler, 24, 30
... Swing arm, 36, 38 ... Brake rail surface,
40...Spring, 42...Operation lever, 46...Cam member.

Claims (1)

[Scope of utility model registration request] Vertical cursor 10 movable along vertical rail 8
A brake mechanism is provided to fix and release the vertical cursor 10 from the vertical rail 8 by rotational displacement of the cam members 46, 64.
In a vertical brake operating device for a rail-type flexible parallel ruler, in which the operating levers 42 and 60 can be rotated by operating levers 42 and 60 that protrude to the sides of the vertical cursor 10, the operating levers 42 and 60 are The operating levers 42, 60 are positioned near the head 18 connected to the vertical cursor 10, and are rotatably attached to the vertical cursor 10.
64. A vertical brake operating device for a rail-type adjustable parallel ruler, characterized in that the device is connected to the cam members 46, 64 via a rotation angle amplification mechanism that increases the rotation angle of 64.