JPH0120078B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a head balance device for a rail-type universal parallel ruler, coordinate analyzer, etc., which is capable of always maintaining head balance regardless of changes in the inclination angle of a drawing board, and has the following features: This is characterized by the provision of a head balance position adjustment mechanism.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be explained in detail below with reference to a rail type universal parallel ruler shown in the accompanying drawings.

Reference numeral 1 denotes a drawing board, which is fixed to a tiltable table and configured so that it can be set at any inclination angle in the upright direction from a horizontal state. Reference numeral 2 denotes a horizontal rail fixed to one side of the drawing board 1, to which a horizontal cursor 3 is slidably attached via rollers. A rising portion 4 is formed integrally with the horizontal cursor 1 in a predetermined positional relationship on the horizontal cursor 3, and a shaft supporting member 5 is fixed to the upper surface of the rising portion 4 with screws. The shaft support member 5 has a shaft 6.
is fixed so as to be perpendicular to the longitudinal direction of the horizontal rail 2 and parallel to the surface of the drawing board 1. Reference numeral 7 denotes a mounting frame screwed and fixed to one end of the vertical rail 8, and the frame 7 is formed with a projecting piece 9 having a hole therethrough, into which the shaft 6 is inserted via a ball bearing. It is fitted. The vertical rail 8 is perpendicular to the longitudinal direction of the horizontal rail 2, and
It is set parallel to the plane. An arm 10 is screwed and fixed to one end of the vertical rail 8, and a tail roller 1 is attached to the lower end of the arm 10.
1 is rotatably supported so that its direction of rotation is parallel to the horizontal rail 2. A vertical cursor 13 is slidably attached to the vertical rail 8 via rollers 12, and a connecting member 14 is rotatably supported on a shaft 15 at the rising portion of the vertical cursor 13. Reference numeral 16 denotes a link member rotatably supported by a shaft 17 on the other side of the connecting member 14, and a roller 18 is attached to a projecting piece of this link member, and the roller 18 is connected to a stopper provided at the rising portion of the vertical cursor 13. It faces the stopper surface 19 of the member.
When the roller 18 is released from the head 24 with the head 24 floating above the drawing board 1, the weight of the head 24 causes the roller 18 to move clockwise in FIG. 2 around the axis 17 of the link member 16. It comes into pressure contact with the stopper surface 19 by the rotational force. Stopper surface 19
supports the weight of the floating head 24 via the rollers 18 and prevents the link member 16 from rotating clockwise about the shaft 17. A stopper surface 21 formed on the connecting member 14 faces the stopper surface 20 of the stopper member. A long hole 22 is transparently provided in the horizontal part of the member 16, and a threaded portion of a threaded rod 23 movably inserted into the long hole 22 is connected to a screw hole 26 drilled in the fixing plate 25 of the head 24. are screwed together. Said long hole 2
2, the screw rod 23, and the screw hole 26 constitute a head balance position adjustment mechanism. The head 24
Straight rulers 28 and 29 are removably fixed to the ruler mounting plate 27. The opposing distance b' between the central axis of the shaft 6 and the extended surface of the drawing board 1 is set to be the same as the opposing distance b between the center of the tail roller 11 and the drawing board 1 surface, and the drawing passes through the center of the vertical rail 8. The opposing distance a' in the X-coordinate axis direction on the X-Y coordinate plane between the perpendicular c perpendicular to the board 1 surface and the perpendicular line perpendicular to the drawing board 1 surface passing through the center of the axis 6 is the distance between the perpendicular c and the tail. It is set to be the same as the opposing distance a in the X coordinate axis direction from a perpendicular line passing through the center of the roller 11 and perpendicular to the surface of the drawing board. With the screw rod 23 loosened, hold the fixing plate 25 of the head 24,
The shaft 6 and the tail roller 11 slide against the horizontal part of the member 16 and are generated by the weight of the vertical rail 8, etc.
The rotational moment in the counterclockwise direction of rotation of the hour hand in FIG.
When the rotational moment in the rotational direction of the upper hour hand in FIG. 2 about the tail roller 11 becomes the same,
The screw rod 23 is tightened to fix the fixing plate 25 to the horizontal portion of the link member 16. As a result, the head 24 is stably held at any arbitrary position relative to the drawing board 1. This equilibrium state of the head 24 remains unchanged even when the drawing board 1 is rotated about an arbitrary axis parallel to the horizontal rail 2 and its inclination angle is changed.

In the above configuration, when the head 24 is grasped by hand and force is applied in an arbitrary direction parallel to the surface of the drawing board, the horizontal cursor 3 moves along the horizontal rail 2, and the vertical cursor 13 moves along the vertical rail. 8, the head 24 can be moved to a desired position on the drawing board 1. When the head 24 is lifted by hand, the vertical rail 8 rotates within its movable range around a rotational axis set parallel to it, that is, an axis passing through the center of the shaft 6 and the center of the rollers 11, and the vertical rail 8 rotates within its movable range. Even when the hand is released, the head 24 remains floating above the surface of the drawing board.

Next, another embodiment of the head balance position adjustment mechanism will be described with reference to FIG.

30 is a vertical cursor, the horizontal part of the adjustment member 31 is in contact with the lower surface of the vertical cursor, and a threaded rod 33 is slidably inserted into an elongated hole 32 provided through the horizontal part. The threaded portion is screwed into a screw hole 34 drilled in the vertical cursor 30. 35 is a connecting member, 36 is a link member, to which a fixing plate 38 of the head is fixed.

In the above configuration, with the screw rod 33 loosened, the member 31 is slid against the vertical cursor 30 to change the distance between the head 24 and the vertical rail 8, and when the head is balanced, the screw rod is moved. 33, move the member 31 to the vertical cursor 30
Fixed to.

Next, another embodiment of the head balance position adjustment mechanism will be described with reference to FIGS. 5 and 6.

40 is a T-groove provided in a frame member 46 fixed to one end side of the vertical rail 41 in a direction perpendicular to the longitudinal direction of the vertical rail 41, and a threaded rod 42 is provided in this T-groove.
The head of the threaded rod 42 is slidably inserted and arranged.
The threaded portion of the threaded rod 42 is slidably inserted into the hole 44 of the rotating member 43, and the threaded portion of the threaded rod 42 is fitted with a nut 45.
is screwed in. The member 43 is a shaft supporting member 4 fixed to a rising member 47 integral with the horizontal cursor.
8 and is rotatably supported by a shaft 49.

Reference numeral 50 denotes an arm fixed to the tail of the vertical rail 41, on which a T-slot 52 is formed in a direction perpendicular to the longitudinal direction of the vertical rail 41, and a screw is slidably inserted into the T-slot 52. The threaded part of the rod 53 is
It is slidably inserted into a transparent hole in the roller holder member 54, and a nut 5 is inserted into the threaded portion of the threaded rod 53.
5 is screwed in. The member 54 has a tail roller 5.
6 is rotatably supported.

In the above configuration, the members 43 and 54 are moved and adjusted along the T grooves 40 and 52 with the nuts 45 and 55 loosened, and the spacing between the centers of the shafts 49 and rollers 56 and the center of the vertical rail 41 is adjusted. Then, when the head is balanced, nuts 45 and 55 are tightened to fix members 43 and 54 in T-slots 40 and 52.

Since the present invention is configured as described above, the gravity of the head in the direction of the drawing surface is canceled out, and the head can be raised and lowered with a light force with respect to the drawing surface, regardless of the inclination angle of the drawing surface. It is possible to stably maintain the balance in a position close to and away from the drawing surface, and even if there is an error in the mechanical accuracy of a rail-type universal parallel ruler, the head balance position adjustment mechanism can maintain this balance. There are effects that can be easily set.

[Brief explanation of drawings]

Fig. 1 is an overall plan view of the rail type universal parallel ruler, Fig. 2 is a front sectional view of the main part, Fig. 3 is a front sectional view of other main parts, and Fig. 4 is the main part showing another embodiment. FIG. 5 is a front sectional view of a main part showing another embodiment, and FIG. 6 is a front sectional view of the main part. 1...Drawing board, 2...Horizontal rail, 3...Horizontal cursor, 4...Rising part, 5...Axle support material, 8...
Vertical rail, 11...Tail roller, 13...Vertical cursor, 24...Head, 25...Fixing plate, 26...
Screw hole, 27...Mounting plate, 28, 29...Straight edge, 31...Adjustment member.

Claims (1)

[Claims] 1 A horizontal rail 2 arranged on the side of the drawing board 1, a vertical rail 8 slidably connected to the horizontal rail 2 at right angles, and a vertical rail 8 slidably attached to the vertical rail 8. In a rail type flexible parallel ruler etc. consisting of a cursor 13 and a head attached to the vertical cursor 13 and whose weight is supported by the vertical cursor 13, the vertical rail 8 is aligned with an axis parallel to its longitudinal direction. The head is set to be rotatable around the axis, and the distance between the head position and the axis of rotation of the vertical rail 8 can be adjusted, and by this adjustment, the head etc. can rotate around the axis due to its own weight. moment and the vertical rail 8
A head balancing device characterized in that a rotational moment about the axis in the opposite direction to the rotational moment due to the own weight of the head can be set to be substantially the same.