JPH054493A - Pen lifting mechanism in automatic line making device - Google Patents

Abstract

PURPOSE:To prevent the jumping up of a pen arm from a pen-up plate during pen-up movement and cause the pen arm to accurately follow the downward movement of the pen-up plate during pen-down movement. CONSTITUTION:A cursor 12 is provided in a casing 1 in such a manner as to permit its movement lengthwise and widthwise of the casing and the rear end of a pen arm 13 is mounted rotatably and pivotally to the cursor 12 in such a manner that its forward end can be raised and lowered relative to a mounting surface. A vertically movable pen-up plate 26 is supported on the front part of the casing 1 and a vertically movable pen arm bar 31 is supported on the pen-up plate 26. The pen arm 13 is provided slidably between the pen-up plate 26 and the pen arm bar 31, the force of a spring 32 is exerted on the pen arm bar 31 in a direction closer to the pen-up plate 26 and, by the force of this spring, the pen arm 13 is pressed against the pen-up plate 26 to be vertically moved following the vertical movement of the pen-up plate 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pen raising / lowering mechanism for an automatic drawing device.

[0002]

2. Description of the Related Art An X-axis drive mechanism built in a casing and a Y
A pen arm holding a pen at its tip is pivotally supported by a cursor linked to an axis drive mechanism, and the tip of the pen arm is arranged so as to project from the opening of the casing to the front of the casing.
The pen arm is placed on the pen-up plate by its own weight, the cursor is driven in the X-axis and Y-axis directions, the pen-up plate is moved up and down, and in conjunction with this, the pen on the tip of the pen arm draws an image on the screen. An automatic streaker adapted to perform the above is disclosed in Japanese Utility Model Publication No. 1-148389.

[0003]

In the above automatic scribing machine, when the pen is down, the pen-up plate is lowered at high speed by the solenoid, but the pen arm is lowered by the weight of the pen, so that the screen is in an upright state. In the case of, the pen arm might not descend.

Further, at the time of pen-up, the return spring raises the pen-up plate at a high speed, but at this time, the pen arm jumps up from the pen-up plate, and the responsiveness at the time of the next pen-down deteriorates. There was a problem.
The present invention is intended to solve the above problems.

[0005]

In order to achieve the above object, the present invention supports a cursor 12 movably in two axial directions in a casing 1 placed on a placing surface such as a drawing board. On the cursor 12, the rear portion of the pen arm 13 whose tip projects forward of the casing 1 is rotatable about an axis that is perpendicular to the longitudinal direction of the pen arm 13 and is substantially horizontal to the bottom plate 1a of the casing 1. A pen-up plate 26, which is axially supported and is arranged over the entire length of the movement path of the pen arm 13 in the parallel movement direction, is supported in the casing 1 so as to be able to move up and down. The pen arm 1 is provided on the upper surface of the plate 26.
In the pen lifting mechanism of the automatic image pick-up device, the lower surface of 3 is placed, and the pen arm 13 moves up and down with respect to the mounting surface in conjunction with the lifting of the pen up plate 26. A pen arm bar 31 is disposed above and in parallel with the pen arm bar 31 so that the pen arm bar 31 can slide up and down, and the upper surface of the pen arm 13 slidably abuts on the lower surface of the pen arm bar 31 to attach the pen arm bar 31 to the pen up plate 26. The pen arm 13 is urged toward the pen-up plate 26 by the urging force.

[0006]

The pen arm 13 is pressed against the pen up plate 26 by the urging force of the pen arm bar 31, and in this pressed state, the pen arm 13 moves up and down following the up and down movement of the pen up plate 26.

The biasing force of the pen arm bar 31 is set to such a magnitude that the pen arm 13 descends in conjunction with the pen-up plate 26 when the screen is upright.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below in detail with reference to the embodiments shown in the accompanying drawings. In FIG. 1, reference numeral 1a is a bottom plate of a casing 1 of an automatic image drawing machine, and a pair of brackets 2, 3 and 4, 5 are fixed to both sides of the bottom plate. Between the brackets 2, 3 and 4, 5, Y guide shafts 6, 7 are installed in parallel with each other.

Numerals 8 and 9 are X's each consisting of a pair of parallel shafts arranged at right angles to the Y guide axes 6, 7.
It is a shaft guide, and Y cursors 10 and 11 are fixedly provided at both ends thereof, and the Y cursors 10 and 11 are slidably connected to the Y guide shafts 6 and 7. An X cursor 12 is slidably fitted to the X-axis guides 8 and 9, and a rear end of a pen arm 13 perpendicular to the X-axis guide 8 is provided on one side of the X-cursor 12 so that the X-axis guide 8 is provided. 8 is rotatably supported about an axis parallel to 8.

The pen arm 13 is urged by a spring 15 in a rising direction, and the tip end portion thereof has a casing 1
The front wall of the casing 1 projects forward of the casing 1 from an opening formed over substantially the entire length in the longitudinal direction thereof.

The pen arm 13 holds a commercially available pen (not shown) detachably in a holder 16 at its tip. The Y cursor 10 is linked to an output shaft of a Y motor 20 fixed to the bottom plate 1a by a known power transmission mechanism including a belt drum 17, a belt pulley 18, and a transmission belt 19.

The Y cursor 11 is linked to the output shaft of the Y motor 20 by a known power transmission mechanism including belt pulleys 21 and 22, a transmission belt 23, an interlocking shaft 24 and a belt drum 17. There is.

By driving the Y motor 20, the X-axis guides 8 and 9 are moved along the Y-guide shafts 6 and 7 into the casing 1.
It is configured to be translated in the front-back direction, that is, in the Y-axis direction.

The X cursor 12 is linked to the output shaft of an X motor 25 fixed to the bottom plate 1a by a known power transmission mechanism including a rope pulley and a wire rope.

By driving the X motor 25, the X cursor 12 is configured to move along the X axis guides 8 and 9. A pen-up plate 26 is arranged below the pen arm 13 over the entire movement path thereof, and the pen-up plate 26 is driven by a lift drive mechanism including a solenoid 27 fixed to the bottom plate 1a and a pen-up spring 28. It is configured to be driven up and down.

As the pen-up plate 26 moves up and down,
The pen arm 13 swings around its pivot 14 and the tip of the pen arm 13 moves up and down with respect to a mounting surface such as a table on which the casing 1 is mounted. There is. By moving the tip of the pen arm 13 up and down, the pen held by the pen arm 13 comes into contact with and separates from the paper on the placement surface.

Y guide shafts 6, 7 of the X-axis guides 8, 9
Along the Y axis guides 8 and 9 of the X cursor 12, and the pivot 14 of the pen arm 13.
The pen is used to draw predetermined characters, figures, etc. on the sheet on the placing surface by a vertical swinging motion about the section.

The pen-up plate 26 is formed in a U shape as a whole, and both side portions 26a and 26b are rotatably attached to the bottom plate 1a about an axis parallel to the X-axis guides 8 and 9. A shaft 33 is supported by brackets 29 and 30 which are erected.

The elongated portion 26c of the pen-up plate 26 is formed on the front wall of the casing 1 and has a pen arm 13.
It is arranged behind and parallel to the opening for movement (not shown).

Reference numeral 31 denotes a pen arm bar formed in a U shape as a whole, and both ends of both sides of the pen arm bar are rotatably attached to the brackets 29 and 30 about the rotation center axis of the pen up plate 26. 33 are supported.

Reference numeral 32 is a spring supported by the shaft 33, one end of which is engaged with the lower surface of the pen-up plate 26, and the other end of which is engaged with the pen arm bar 31.

The pen arm bar 31 has the spring 15
The pen arm bar 3 is urged downward by a spring 32 having a spring force larger than that of the pen arm bar 3 by this urging force.
1 is elastically contacted with the upper surface of the pen arm 13 and resists the elastic force of the spring 15 to prevent the pen arm 13 from moving up.
6 is pressed against the upper surface of the elongated portion 26c.

A rising portion 34 is formed immediately above the rotation center shaft 33 of one side portion 26a of the pen-up plate 26, and a pen-up tension coil spring whose one end is locked to the bottom plate 1a is formed on the rising portion 34. The other end of 28 is connected.

The pen-up plate 26 has an elongated portion 26.
The spring 28 is urged in a direction in which c is increased, and the urging force causes the pen-up plate 26 to reach a predetermined locking position.
The pen arm 13 rotates about the shaft 33.
Is pushed up against the downward force of the pen arm bar 31. Reference numeral 35 is a stopper formed at the end of one side 26a of the pen-up plate 26.

In FIG. 2, reference numeral 36 denotes a fixed shaft fixedly mounted on the bottom plate 1a, to which an inner ring of the one clutch 60 is fixed, and an outer ring of the one clutch 60 has a damper mount 3 mounted thereon.
7 is fixedly mounted, and a well-known casing of an oil damper 38 is supported on the mounting base 37.

The outer ring of the one-sided clutch 60 freely rotates in the rotation direction of the rotating body 42 as the pen-up plate 26 moves up with respect to the inner ring of the one-sided clutch 60, and in the direction of rotation opposite to this rotation direction. Is configured to interlock with the inner ring of the one-way clutch 60.

A wire rope 43 is hooked in the rope groove of the rotating body 42, and one end of the wire rope 43 is output from a solenoid 27 fixedly mounted on the bottom plate 1a via a cushion spring 61 connected to the wire rope 43. The wire rope 43 is connected to the shaft, and the other end of the wire rope 43 is connected to the rising portion 34. Appropriate tension is applied to the wire rope 43 so as not to slip on the rotating body 42.

Next, the operation of this embodiment will be described. When the solenoid 27 is in the non-energized state, its output shaft is in the maximum protruding state due to the tension of the wire rope 43, and the long portion 26c of the pen-up plate 26 is in the state of being maximally raised by the tensile force of the spring 28. ..

In this state, the pen arm 13 is pushed up by the pen up plate 26, and the pen at the tip of the pen arm 13 is raised from the screen. When the solenoid 27 is energized by the output from the controller, its output shaft is attracted in the backward direction, and the wire rope 43 is pulled by a predetermined amount.

The backward displacement of the output shaft of the solenoid 27 is transmitted to the rising portion 34 of the pen-up plate 26 via the wire rope 43. The pen-up plate 26 swings around the shaft 33, and the long portion 26c thereof descends to a predetermined locking position.

The pen arm 13 that has lost its support due to the lowering of the pen-up plate 26 descends in conjunction with the lowering of the pen-up plate 26 by the descending force of the pen arm bar 31, and the pen held by the holder 16 at the tip of the pen arm 13 is held. The tip of P contacts the screen, that is, the paper on the placement surface.

As shown in FIG. 4, the pen-up plate 26 descends slightly even after the pen P comes into contact with the screen. As shown in FIG. 4C, the gap G is separated and the pen P exerts a writing pressure on the screen due to the deflection of the spring 31.

The pen-down movement is performed relatively slowly by the damper action of the damper 38, despite the rapid operating speed of the output shaft of the solenoid 27. That is,
The sudden backward displacement of the output shaft of the solenoid 27 when it is energized is transmitted to the rotary shaft of the damper 38 via the wire rope 43 and the rotary body 42, and the output shaft of the solenoid 27 receives a large load due to the inertia of the inertial body of the damper 38. Thus, the output shaft of the solenoid 27 is slowly displaced backward.

Therefore, the pen-up plate 26 driven by the solenoid 27 slowly descends. Solenoid 2
When the power supply to 7 is released, the output shaft is free to move in the protruding direction. As a result, the pull-up force of the spring 28 causes the pen-up plate 26 to rotate about the shaft 33, and the long portion 26c rises.

As the elongated portion 26c of the pen-up plate 26 rises, the pen arm 13 rises against the downward force of the pen arm bar 31, and the pen rises a predetermined distance from the screen. The swing of the pen-up plate 26 by the spring 28 stops when the output shaft of the solenoid 27 is locked.

When the pen is raised, the outer ring of the clutch 60 rotates freely, the inertial force of the damper 38 does not act on the rotor 42, and the pen up plate 26 rises rapidly.

The pen-up plate 2 of the pen arm 13 when the pen-up plate 26 suddenly stops at a predetermined rising position.
Bounce up against 6 is prevented by the downward biasing force of the pen arm bar. As is clear from the above description,
The solenoid 27 and the spring 28 are the pen-up plate 26.
And an up-and-down drive mechanism that drives the up and down direction.

Next, another embodiment of the pen arm bar supporting mechanism will be described with reference to FIGS. Pen-up board 2
6, projecting pieces 40 (the other one is not shown) are fixedly mounted on both side portions 26a (the other one is not shown), and support shafts 46 fixedly mounted at right angles to both ends of the pen arm bar 44 are provided in the holes of the projecting pieces 40. It is slidably inserted. One end of the tension coil spring 48 fitted into the support shaft 46 is locked to the projecting piece 40, and the other end is locked to the pen arm bar 44. The other structure is the same as that of the first embodiment.

In the above structure, the pen arm bar 4
4 is biased in the descending direction by the tensile force of the tension coil spring 48, and presses the pen arm 13 against the upper surface of the pen-up plate 26. The descending position of the pen-up plate 26 is set so that the pen-up plate 26 further descends after the pen P is locked to the screen during pen-down. Therefore, as shown in FIG. 6, when the pen is down, the pen-up plate 26 separates from the lower surface of the pen arm 13, and the pen P generates a writing pressure due to the deflection of the tension spring 48.

[0040]

As described above, according to the present invention, the pen-up plate and the pen arm follow up and down, so that the response of the pen-down operation can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a casing with a top plate removed.

FIG. 2 is a perspective view of a main part.

FIG. 3 is a perspective view of a main part.

FIG. 4 is an explanatory diagram of a pen-down operation.

FIG. 5 is a perspective view showing another embodiment.

FIG. 6 is a side view showing another embodiment.

[Explanation of symbols]

 1 Casing 2 Bracket 3 Bracket 4 Bracket 5 Bracket 6 Y Guide Axis 7 Y Guide Axis 8 X Axis Guide 9 X Axis Guide 10 Y Cursor 11 Y Cursor 12 X Cursor 13 Pen Arm 14 Pivot 15 Spring 16 Holder 17 Drum 18 Pulley 19 Belt 20 Y Motor 21 Pulley 22 Pulley 23 Belt 24 Interlocking Shaft 25 X Motor 26 Pen Up 27 Solenoid 28 Spring 29 Bracket 30 Bracket 31 Pen Arm Bar 32 Spring 33 Rotation Center Shaft 34 Rise 35 Stopper 36 Fixed Shaft 37 Mounting Base 38 Damper 40 Projection Piece 42 Rotating body 43 Wire rope

Claims (1)

What is claimed is: 1. A cursor 12 is movably supported in a casing 1 mounted on a mounting surface such as a drawing board in two axial directions.
A rear portion of a pen arm 13 having a tip protruding forward of the casing 1 is rotatable with respect to the cursor 12 about an axis that is perpendicular to the longitudinal direction of the pen arm 13 and is substantially horizontal to the bottom plate 1a of the casing 1. A pen-up plate 26, which is rotatably supported by the pen arm 13 and is disposed over the entire length of the movement path of the pen arm 13 in the parallel movement direction, is supported in the casing 1 so as to be vertically movable, and the pen-up plate 26 is linked to a lifting drive mechanism. The lower surface of the pen arm 13 is placed on the upper surface of the up plate 26, and the pen arm 13 is moved up and down in association with the up and down movement of the pen up plate 26. In the mechanism,
A pen arm bar 31 is arranged above the pen-up plate 26 in parallel with the pen-arm plate 31 so as to be able to move up and down, and the upper surface of the pen arm 13 is slidably abutted on the lower surface of the pen arm bar 31 to move the pen arm bar 31 to the above-mentioned position. A pen lifting mechanism for an automatic image drawing device, characterized in that the pen arm (13) is urged toward the pen up plate (26) and the pen arm (13) is pressed against the pen up plate (26) by the urging force.