JPH0228480B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a balance weight guide device for parallel rulers.

Conventionally, in this type of device, the balance weight moves in the cavity of the vertical rail in a direction opposite to the horizontal ruler in conjunction with the movement of the horizontal ruler. The balance weight is in contact with the bottom wall surface of the cavity due to its own weight, either directly or via rollers, but there has been a drawback in that the friction of the contact portion generates noise when the balance weight runs.

It is an object of the present invention to reduce the above-mentioned noise and to enable the balance weight to run smoothly along the vertical rail.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described in detail below with reference to embodiments shown in the accompanying drawings.

Reference numeral 2 denotes a drawing board, which is fixed to a drawing board support frame (not shown) of a drafting table at an angle of approximately 45° to the floor surface. 4 and 6 are vertical rails made of hollow elongated members fixed to the left and right sides of the drawing board 2;
As shown in FIG. 3, rail portions 4a, 4b, 6a, 6b and partition wall portions 8, 10, 12, 14 are formed over the entire length in the longitudinal direction, and the partition wall portions 8,
10, 12, and 14 are formed with vertical surfaces 8a, 10a, and 12a, 14a facing each other in parallel. The upper surfaces of the partition walls 8, 10 and 12, 14 constitute weight guide surfaces. In FIG. 2, reference numerals 16 and 18 are cover members fixed to one end of each of the vertical rails 4 and 6, and ball bearings 20 and 22 are inserted into holes formed in the side walls of the members 16 and 18.
A hole is provided in the side wall of the vertical rail 4, 6, facing the ball bearing 20, 22, into which the vertical rail 4, 6 is fitted. Reference numeral 24 denotes a transmission shaft, portions near both ends of which are fitted and held in the inner rings of the ball bearings 20, 22, and belt pulleys 26, 28 are fixed to both ends of the shaft 24. Reference numerals 30 and 32 are U-shaped frames that slidably abut on the inner surfaces of both side walls near the other ends of the vertical rails 4 and 6, and screw holes 34 and 36 are formed in the bottom walls of these frames. U-shaped frame 30, 3
Horizontal shafts 38 and 40 are rotatably suspended between the both side walls of 2, and belt pulleys 42 and 40 are mounted on the horizontal shafts 38 and 40, respectively.
44 is fixed. Reference numerals 46 and 48 indicate cover plates fixed to the other ends of the vertical rails 4 and 6, and holes 50 and 52 are provided therethrough. Reference numerals 54 and 56 are cap screws that are slidably inserted into the holes 50 and 52, and these threaded portions are inserted into the screw holes 34 and 3.
It is screwed into 6. Endless timing belts 58 and 60 are stretched between the pulleys 42 and 26 and between the pulleys 44 and 28 with appropriate tension. In FIG. 3, 62 and 64 are vertical cursors, on which upper rollers 66 and 68 and a plurality of lower rollers 70 and 72 are rotatably supported, and the grooves on the surfaces of the upper rollers 66 and 68 correspond to the rails. It is rotatably fitted into the parts 4a and 6a, and the lower roller 7
The grooves on the surface of the rails 0 and 72 are rotatably fitted into the rail portions 4b and 6b. Ruler holders 74 and 76 are made of L-shaped plates, and the lower ends of their respective vertical parts are attached to the upper ends of the vertical cursors 62 and 64. Both ends of a horizontal ruler 77 are removably fixed to the horizontal portions of the holders 74 and 76 via metal fittings. Numerals 78, 80, 82, and 84 are magnets made of elongated magnetic rubber disposed in the grooves of the partition wall portions 8, 10, 12, and 14 over the entire longitudinal length of the vertical rail. ，
From the left on the surfaces of 80, 82, and 84 are N pole, S pole,
Magnetic pole tracks are formed in three rows along the vertical rails 4 and 6 in the order of north pole. 86 and 88 are balance weights, and on the lower surfaces of both sides of these weights,
Magnets 90, 92 and 94, 96 having three rows of magnetic pole tracks are fixed in the order of NSN poles from the left,
As shown in FIG. 3, the magnets 90, 92, 94, 96 have the same polar faces facing the magnets 78, 80, 82, 84. The balance weight 8
The bottom surface of 6, 88 is between magnets 90, 78, 92, 80
Due to the repulsive magnetic force acting between 94 and 82 and between 96 and 84, the weight guide surfaces 8b and 10
b, 12b, and 14b. 98,1
Reference numeral 00 denotes a plurality of lateral vibration regulating rollers that are rotatably supported in the recesses provided in the bottom protrusions of the balance weights 86 and 88, and the surfaces of these rollers are , the vertical surface 8
a, 10a and 12a, 14a are opposed to each other with a slight gap. The rollers 98, 100 and the vertical surfaces 8a, 10a, 12a, 14a are used to control the vertical rails 4, 6 of the balance weights 86, 88 in a plane parallel to the weight guide surfaces 8b, 10b, 12b, 14b. A lateral vibration prevention mechanism is configured to prevent movement in a direction perpendicular to the longitudinal direction, that is, in the arrow direction AB. The upper horizontal portions of the belts 58, 60 are fixed to the lower surfaces of the balance weights 86, 88 by fittings, and the lower horizontal portions of the belts 58, 60 are fixed to the lower surfaces of the belts 58, 60 by the fittings. part is fixed.

Next, the operation of this embodiment will be explained.

When the horizontal ruler 77 is pressed vertically along the second surface of the drawing board in FIG. 1, the vertical cursor 62,
64 are the rail parts 4a, 4b of the vertical rails 4, 6,
6a and 6b, the horizontal ruler 77 moves along the vertical rails 4 and 6, and as a result, the horizontal ruler 77 moves in parallel in the vertical direction in FIG. 1 along the surface of the drawing board 2. When the vertical cursors 62, 64 move along the vertical rails 4, 6, the balance weights 86, 88 move in conjunction with the vertical cursors 62, 64.
In the opposite direction to the direction of movement of the weight guide surface 8
It moves while floating above b, 10b, 12b, and 14b. When the drawing board 2 is erected at an angle of about 45 degrees from the floor, even if you take your hand off the horizontal ruler 77 and the horizontal ruler 77 becomes free, the horizontal ruler 77 will not move due to the action of the balance weights 86 and 88. It is held at a stationary position on the drawing board 2 without falling along the drawing board 2 surface. In addition, when the slope of the drawing board 2 is changed, the balance weight 86,
88 weight guide surfaces 8b, 10b, 12b, 1
A change occurs in the load acting on 4b. However,
In this embodiment, since the magnets 78, 80, 82, 84 and the magnets 90, 92, 94, 96 facing the magnets are set in multiple rows, the distance between the magnets 78, 90 due to the change in the inclination of the drawing board 2 is 80. ,92 intervals,82,
Changes in the facing distance between 94 and between 84 and 96 can be reduced. Therefore, there is no need to provide a large space for the weight insertion space of the vertical rails 4, 6. Balance weights 86 and 88 are connected to the vertical rail 4,
6, the weights 86, 88 move along the weight guide surfaces 8b, 10b, 12.
When attempting to move in a direction perpendicular to the longitudinal direction of the vertical rails 4, 6 in a plane parallel to b, 14b, the surfaces of the rollers 98, 100 move against the vertical plane 8a.
Alternatively, the magnets 10a and 12a or 14a are brought into contact with each other to prevent the same-polarity track opposing state between the magnets 90 and 78, between 92 and 80, between 94 and 82, and between 96 and 84 from being disrupted. As shown in FIG. 6, magnets 108 and 110 are arranged on the vertical surfaces 104 and 106 over the entire length thereof, and magnets 114 and 116 are arranged on both sides of the lower protrusion of the weight 112.
The lateral vibration control mechanism can also be constructed by causing a repulsive magnetic force to act between the magnets 108 and 114 and between the magnets 110 and 116. Alternatively, as shown in FIG. 5, friction force reducing members 120 are protruded from both sides of the weight 118, either integrally with the weight 118 or separately, and the members 120 are brought close to the vertical surface of the rail. It is also possible to configure a lateral vibration control mechanism. In addition, a friction force reducing surface made of Teflon or the like is formed along the vertical surface of the rail, and on this surface,
Both sides of the weight may be closely opposed. In this case, friction force reducing surfaces may be formed on both sides of the weight.

As described above, in the present invention, a magnetic force is applied to the balance weight disposed along the weight guide surface of the vertical rail in a direction in which it floats from the guide surface, so that the entire weight of the balance weight is transferred to the weight guide surface. This has the effect of allowing the vehicle to run more quietly and smoothly than when it is applied to the vehicle.

[Brief explanation of drawings]

The drawings show a preferred embodiment of the present invention, in which Fig. 1 is an overall plan view, Fig. 2 is a partially cutaway plan view, Fig. 3 is a sectional view, Fig. 4 is an external view of the balance weight, and Fig. 5 is an external view of the balance weight.
The figure is an external view of a balance weight showing another embodiment, and FIG. 6 is a sectional view showing another embodiment. 2...Drawing board, 4, 6...Vertical rail, 4a, 4
b, 6a, 6b...Rail part, 16, 18...Lid member, 24...Transmission shaft, 58, 60...Timing belt, 62, 64...Vertical cursor, 77...
Horizontal ruler, 78, 80, 82, 84...Magnet, 8
6,88...Balance weight, 90,92,9
4,96...Magnet.

Claims (1)

[Claims] 1. A vertical rail on which a weight guide surface is formed along the longitudinal direction, a horizontal ruler attached to the vertical rail so as to be movable along the rail, and a horizontal ruler disposed movably along the weight guide surface; In a device consisting of a horizontal ruler and a balance weight connected by a rope or the like so as to move in opposite directions, a plurality of rows of magnetic pole tracks are arranged on the same plane over substantially the entire length of the weight guide surface so that different poles are adjacent to each other. On the other hand, a plurality of rows of magnetic pole tracks are arranged on the balance weight side to face the magnetic pole tracks, and the balance weight is moved to the weight guide surface by the magnetic force acting between the magnetic pole tracks. The balance weight is biased in a direction in which it levitates from above, and between the weight guide surface side and the balance weight side, the balance weight is provided with respect to the longitudinal direction of the vertical rail in a plane parallel to the weight guide surface. A balance weight guide device for a parallel ruler, characterized by being provided with a lateral shake prevention mechanism to prevent movement in a right angle direction.