JPH0120158Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a head lifting and lowering support device for a rail type universal parallel ruler.

In this type of device, a head is supported on the Y cursor by a quadrilateral link mechanism so that it can move up and down with respect to the drawing surface, and the quadrilateral link mechanism is biased upward by a spring. A structure is known in which the force and the falling force due to the head's own weight are substantially balanced, thereby making it possible to maintain the head floating at a position within its lifting/lowering range. By supporting the head with spring force while floating above the drawing surface and moving the straightedge away from the drawing surface, the movement of the head along the drawing surface becomes easier and the straightedge moves. Since the drawing is not rubbed when doing so, it is possible to prevent the drawing from becoming smeared.

However, in the above device, when drawing a line with the head placed on the drawing surface and the straightedge in close contact with the drawing surface, if you release your hand from the head, the straightedge will move away from the drawing surface due to the spring force. It floats a little, and the straight edge moves slightly. In particular, if the tip of the horizontal straightedge hangs down from the drawing surface, if you press the head with your hand and release the horizontal straightedge from the state where it is in close contact with the drawing board, the horizontal straightedge will fall off. The end floats against the drawing surface due to the spring force. Also, even if the horizontal straightedge is adjusted horizontally to the drawing surface, if you press the head with your hand and release the horizontal straightedge from the state where it is in close contact with the drawing surface, the spring force will cause There was a defect in which a levitation force was applied to the head, causing the straightedge to float slightly relative to the drawing surface, causing the straightedge to move slightly.

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 on the upper edge of this is an X rail 4
is fixed, and a Y rail 6 is movably attached to the X rail 4 in a perpendicular relationship. 8
is a Y cursor that is movably attached to the Y rail 6 via rollers, and is attached to the Y cursor via a head lifting/lowering support device 10, with the head 12 held parallel to the two surfaces of the drawing board. It is attached so that it can be raised and lowered freely on two sides. A horizontal straightedge 16 and a vertical straightedge 18 are attached to the ruler mounting plate 14 of the head 12.

Next, the structure of the head elevating support device 10 will be explained with reference to FIGS. 2 and 3.

Reference numerals 20 and 22 designate links to which bearing members 24, 26, 28, and 30 are fixed, and both pivot-shaped ends of shaft bodies 32 and 34 are rotatably fitted into each of the bearing members. The shaft body 32 is fixed to a support body 36. The support body 36 is fixed to an L-shaped mounting plate 38 which is removably fixed to the Y cursor 8 with a screw. Both ends of the shaft body 34 are rotatably fitted into holes formed in both side plate portions 40a of the head support plate 40. 42 is a cover, and a pair of projections 42a, 42b integrally formed on the cover are rotatably connected to the links 20, 22 by threaded rods 44, 46.
A tube portion is formed in the upper plate portion of the cover 42, and a rotating body 48 is rotatably fitted into the tube portion. A knob 50 is fixed to the upper part of the rotating body 48, and a cylindrical cam 52 is fixed to the lower part. 5
4 is a first spring made of a coil spring wound around the shaft body 32, one end of which is locked to the support body 36, and the other end of the spring 54 is connected to the cam surface of the cylindrical cam 52. It is in ballistic contact with the Due to the elastic force of the spring 54, the links 20 and 22 are biased in the counterclockwise direction, that is, in the upward direction in FIG. 3, about the shaft body 32. This urging force can be adjusted by rotating the cylindrical cam 52. Reference numeral 56 denotes a link, one end of which is rotatably supported by a shaft 58 on the protrusion of the support 36, and the other end of the link 56 has an upper portion attached to the shaft 34.
A shaft 62 is rotatably supported at the lower part of a link 60 which is rotatably coupled to. the shaft bodies 32, 34;
Shafts 58, 62 and links 20, 22, 56, 60
constitutes a quadrilateral link mechanism. Reference numeral 64 designates a shaft rod fixed below the support body 36, to which one end of a second spring 66 made of a coil spring is connected, and the other end of the spring 66 is connected to the link 56.
It is connected to a threaded rod 68 projecting perpendicularly to the top.
The tensile force of the second spring 66 causes the spring 66 to
8, that is, when the spring 66 is located above the conversion point, it biases the link 56 in the counterclockwise rotation direction in FIG. The hour hand is biased in the rotating direction, that is, in the downward direction. The above shaft rod 64, screw rod 6
8, and a spring 66, the second
A spring force direction conversion mechanism is constructed in which the direction of the biasing force of the spring 66 is changed into two directions: upward and downward directions. This spring force direction changing mechanism is not particularly limited to the structure shown in the drawings, as various design changes are possible. Reference numeral 70 designates a vertical hole bored in the head support plate 40 , and an adjustment shaft 72 is slidably inserted into the large diameter portion of the vertical hole 70 . are screwed together. The lower end of the adjustment shaft 72 is in contact with the upper surface of the protrusion 60a of the link 60. Said adjustment shaft 7
A slot for a driver is formed in the flange 2, and the flange is urged upward by a coil spring 74. A cap screw 76 is screwed into a screw hole bored adjacent to the vertical hole 70 to prevent the adjustment shaft 72 from coming off. The head 12 is supported on the head support plate 40.

Next, the operation of this embodiment will be explained.

When the handle 12a of the head 12 is manually pulled up in the upward direction while keeping the lower end of the adjustment shaft 72 in contact with the upper surface of the link protrusion 60a, the links 20 and 22 are moved upward with the shaft body 32 as the center. The head support plate 40 swings in the counterclockwise direction of rotation of the hour hand in FIG. When you release your hand from the handle when the head is in any raised position, the head 12
is held in any raised position by the resiliency of springs 54 and 66. When the head 12 is pressed downward by hand, the links 20 and 22 will move as shown in FIG.
The spring 5 rotates in the direction of rotation of the hour hand about the shaft body 32.
It descends against the elastic force of 4,66. When the head 12 has descended to the vicinity of the second surface of the drawing board, the spring 66
is located below the shaft 58, and the link 5 of the spring 66
The biasing force for 6 is converted. As a result, the link 56 is urged in the direction of rotation of the hour hand in FIG. 3 about the shaft 58. When the head 12 is brought into close contact with the two sides of the drawing board, the straightedges 16 and 18 are brought into close contact with the two sides of the drawing board. In this state, the handle 12 of the head 12
When you let go of a, the head 12 and straight edge 16,
18 is applied to the drawing board 2 by the downward biasing force of the spring 66.
It maintains close contact with the surface and does not float off the two surfaces of the drawing board. That is, at a predetermined position within the lifting range of the head 12 with respect to the drawing board 2 surface, the central axis of the spring 66 is aligned with the axis 5 of the link 56 with respect to the support body 36.
The direction of the biasing force of the spring 66 against the link 56 changes to two directions, up and down, when the angle formed with the line connecting the center of the eight branches and the connection point of the link 56 and the spring 66 becomes zero. do. The parallelism of the horizontal straightedge 16 with respect to the two surfaces of the drawing board can be adjusted by rotating the adjustment shaft 72 and changing the amount of protrusion of its tip from the lower surface of the support plate 40. When the adjustment shaft 72 is rotated in the forward and reverse directions,
The support plate 40 swings within a plane perpendicular to the two planes of the drawing board around a shaft 34 that is perpendicular to the longitudinal direction of the horizontal straightedge 16.

Since the present invention is constructed as described above, it is possible to hold the straightedge in a raised position relative to the drawing surface, and it is also possible to bring the straightedge into close contact with the drawing surface by the spring force. There is an effect that drawing can be performed efficiently.

[Brief explanation of drawings]

FIG. 1 is an overall plan view, FIG. 2 is a cross-sectional view of the main part, and FIG. 3 is a longitudinal cross-sectional view of the main part. 2... Drawing board, 4... X rail, 6... Y rail, 8... Y cursor, 10... Head elevation support device, 12... Head, 14... Ruler mounting plate, 1
6...Horizontal straightedge, 18...Vertical straightedge, 20,
22... Link, 32, 34... Shaft body, 36...
Support body, 40... Head support plate, 42... Cover, 48... Rotating body, 50... Knob, 52...
Cylindrical cam, 54...first spring, 56...link, 58...shaft, 60...link, 62...shaft,
64... Axis rod, 66... Second spring, 68... Threaded rod, 72... Adjustment shaft.

Claims (1)

[Scope of utility model registration request] One of the first links 20 and 22 is swingably supported on the upper part of the support 36 fixed to the Y cursor 8 in a plane perpendicular to the two surfaces of the drawing board, and the head 12
The head support plate 40 supporting the link 20,
A first spring 54 is supported on the support body 36 side, and one of the first springs 54 is supported on the other side of the drawing board 22 so as to be swingable in a plane perpendicular to the two surfaces of the drawing board. By engaging with the links 20 and 22, the link 2
0 and 22 in a direction rising from the surface of the drawing board 2 around the shaft support 36, and one of the second links 56 is attached to the bottom of the support 36 so that the drawing board 2
The head support plate 4 is pivotably supported in a plane perpendicular to the plane, and the other of the second links 56 is connected to the head support plate 4.
0 side, and a tensile force is applied to both ends of a second spring 66 made of a coil spring between the support body 36 and a position of the second link 56 separated from its axial support. connected to act on
At a predetermined position within the range of elevation of the head 12 with respect to the two surfaces of the drawing board, the central axis of the second spring 66 meets the center of the pivot of the second link 56 with respect to the support body 36 and the second link. 56 and the connection point of the second spring 66 is set to be zero, and the angle between the second spring 66 and the second link 56 is set to zero, and the angle between the second spring 66 and the second link 56 is 1. A head elevating and lowering support device for a rail type universal parallel ruler, characterized in that the direction of the biasing force is changed into two directions: elevating and lowering.