JP2939773B2 - Pen lifting mechanism in automatic imager - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pen elevating mechanism for an automatic image forming device.

[0002]

2. Description of the Related Art An X-axis drive mechanism built in a casing and a Y-axis drive mechanism
A pen arm holding a pen at a tip thereof is linked to a shaft driving mechanism, and the tip of the pen arm is disposed so as to protrude forward of the casing from an opening of the casing, and the pen arm is driven in the X-axis and Y-axis directions. Japanese Patent Application Laid-Open No. 1-148389 discloses an automatic imager that raises and lowers the tip of the pen with respect to the screen and draws the image on the screen with the pen at the tip of the pen arm.

In the above automatic drawing device, the pen arm is lowered by driving a pen-up plate in a lowering direction by a driving force of a solenoid, and the pen arm is raised by a pulling force of a return spring. It is done by raising.

[0004]

In the above automatic image drawing device, when the pen is down, since the pen-up plate is lowered at a high speed by the solenoid, acceleration is generated at the tip of the pen arm which interlocks with the pen-up plate in the vertical direction. There is a problem that a large impact occurs when the pen lands. Also, at the time of pen-up, the pen-up plate is raised at a high speed by the return spring, so that there is a problem that the pen arm is raised from the pen-up plate. An object of the present invention is to solve the above problems.

[0005]

In order to achieve the above object, according to the present invention, a cursor 12 is supported in a casing 1 so as to be movable in two axial directions, and a tip of the cursor 12 projects forward of the casing 1. The rear of the pen arm 13 is perpendicular to the longitudinal direction of the pen arm 13 and the casing 1
A pen-up plate 26 rotatably supported about a substantially horizontal axis with respect to the bottom plate 1a, and disposed over the entire length of the movement path of the pen arm 13 in the parallel movement direction, and supported on the casing 1 so as to be vertically movable; The pen-up board 26
Is connected to an output shaft of a solenoid 27 through a rope 43, and the pen-up plate 26 is connected to a return spring 28 for urging the pen-up plate 26 in the ascending direction. The pen arm 13 is engaged with the pen-up plate 26 so that the tip end of the pen arm 13 moves up and down in conjunction therewith, and the pen-up plate 26 is lowered against the urging force of the return spring 28 by driving the solenoid 27. A pen elevating mechanism of an automatic imager which is driven in a direction, a damper 38, a rotating body 42 which engages with the rope 43 and rotates in conjunction with elevating the pen up plate 26;
When the rotating body 42 rotates in conjunction with the lowering of the pen-up plate 26, the rotational force of the rotating body 42 is
8 and the one-way clutch 60 which is configured not to transmit the rotational force of the rotating body 42 to the damper 38 when the rotating body 42 rotates in conjunction with the elevation of the pen-up plate 26. A cushion spring 61 is provided on the transmission path of the rope 43 between the solenoid 42 and the output shaft of the solenoid 27.

[0006]

The pen-up plate 2 is driven by the driving force of the solenoid 27.
When the rocker 6 swings in the downward direction, the rotating body 42 rotates, and the inertial force of the damper 38 acts on the rotating body 42. Rotating body 4
Although the solenoid 27 is driven at a high speed by the linkage between the pen 2 and the pen-up plate 26, the pen-up plate 26 moves down slowly, and the pen soft-lands on the screen.

When the pen-up plates 26 and 44 are driven in the downward direction, the solenoid 2 is
7, a sudden change in the tension of the rope 43 can be prevented, and the pen arm 13 can be lowered smoothly.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction 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 denotes a bottom plate of a casing 1 of an automatic image streer, and a pair of brackets 2, 3, 4 and 5 are fixed to both sides thereof. Between the brackets 2, 3, 4 and 5, Y guide shafts 6 and 7 are installed in parallel with each other.

Reference numerals 8 and 9 denote Xs comprising a pair of parallel shafts arranged at right angles to the Y guide shafts 6 and 7.
Y-cursors 10 and 11 are fixedly provided at both ends of the shaft guide, 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. It is pivotally supported 14 so as to be rotatable about an axis parallel to 8.

The pen arm 13 is urged by a spring 15 in a direction in which the pen arm 13 moves upward.
Projecting forward of the casing 1 from an opening formed in substantially the entire length of the front wall in the longitudinal direction.

The pen arm 13 has a commercially available pen (not shown) detachably held by a holder 16 at the tip thereof. The Y cursor 10 is linked to the 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. I have.

When the Y motor 20 is driven, the X axis guides 8 and 9 move along the Y guide shafts 6 and 7 to the casing 1.
In the front-rear direction, that is, in the Y-axis direction.

The X cursor 12 is linked to an 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.

When the X motor 25 is driven, the X cursor 12 moves along the X axis guides 8 and 9. A pen-up plate 26 is disposed below the pen arm 13 over the entire movement path thereof. The pen-up plate 26 is a lifting / lowering drive mechanism including a solenoid 27 fixed to the bottom plate 1a and a pen-up return spring 28. Is configured to be driven up and down.

In conjunction with the elevation of the pen-up plate 26,
The pen arm 13 swings about its pivot 14, and the swing causes the tip of the pen arm 13 to move up and down with respect to a mounting surface such as a table on which the casing 1 is mounted. I have. The pen held by the pen arm 13 comes into contact with and separates from the paper on the mounting surface by elevating the tip of the pen arm 13.

The Y guide shafts 6, 7 of the X axis guides 8, 9 are provided.
, The movement of the X cursor 12 along the Y-axis guides 8, 9, and the pivot 14 of the pen arm 13.
A predetermined character, figure, or the like is drawn on a sheet on the mounting surface by a pen by the vertical swing movement around the portion.

Next, the pen arm elevating mechanism will be described. The pen-up plate 26 is formed in a U-shape as a whole, and both side portions 26a and 26b thereof are connected to the X-axis guide 8,
9 so as to be rotatable about an axis parallel to 9.
are supported by brackets 29 and 30 erected on a.

An elongated portion 26c of the pen-up plate 26 is formed on a 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 ends of both sides of the pen arm bar are pivotally mounted on the brackets 29 and 30 so as to be rotatable about the rotation center axis of the pen-up plate 26. Supported.

The pen arm bar 31 is urged downward by a spring 32, and the urging force causes the pen arm bar 31 to resiliently contact the upper surface of the pen arm 13, thereby causing the pen arm 13 to oppose the elastic force of the spring 15. The pen-up plate 26 is pressed against the upper surface of the long portion 26c.

Immediately above the rotation center axis 33 of one side portion 26a of the pen-up plate 26, a rising portion 34 is formed, and the rising portion 34 is formed of a tension coil spring having one end locked to the bottom plate 1a. The other end of the return spring for up 28 is connected.

The pen-up plate 26 has a long portion 26
c is urged by a return spring 28 in the ascending direction, and the urging force causes the pen-up plate 26 to rotate about the shaft 33 and push up the pen arm 13 against the downward force of the pen arm bar 31. ing. At the end of one side 26a of the pen-up plate 26, a stopper 35 is provided with a bottom plate 1a.
Are formed opposite to each other.

In FIG. 2, reference numeral 36 denotes a fixed shaft fixed to the bottom plate 1a, on which an inner diameter side of one clutch 60 is fixed, and a damper mount 37 is fixedly mounted on an outer diameter side of the one clutch 60. A casing 39 of a known oil damper 38 is supported on the mounting table 37. The outer diameter portion of the one-way clutch 60 is free to rotate with respect to the inner diameter portion of the one-way clutch 60 in the rotation direction of the rotating body 42 with the rise of the pen-up plate 26, and in the rotation direction opposite to this rotation direction. Is configured to interlock with the inner diameter portion of the one-way clutch 60.

As shown in FIG. 3, the oil damper 38 is
A casing 39 in which oil is sealed;
An inertia body 40 disposed in the inside and a rotating shaft 41 coupled to the inertial body 40 are provided. A disk-shaped rotating body 42 is fixed to the rotating shaft 41, and a rope groove is formed in the rotating body 42. ing.

A wire rope 43 is hung on the rotating body 42, and one end of the wire rope 43 is connected to an output shaft of a solenoid 27 fixed to the bottom plate a via a cushion spring 61 connected to the wire rope 43. And the wire rope 43
Is connected to the rising portion 34. An appropriate tension is applied to the wire rope 43 so that the wire rope 43 does not slip on the rotating body 42.

Next, the operation of this embodiment will be described. When the solenoid 27 is in a non-energized state, the output shaft of the solenoid 27 is in the maximum protruding state due to the tension of the wire rope 43, and the long portion 26 c of the pen-up plate 26 is in a 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 an output from the controller, its output shaft is sucked 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 its long portion 26c descends to a predetermined locking position.

The pen arm 13, which has lost its support due to the lowering of the pen-up plate 26, lowers in conjunction with the lowering of the pen-up plate 26 by the lowering force of the pen arm bar 31, and the pen held by the holder 16 at the tip of the pen arm 13. Abuts on the screen, ie, the paper on the mounting surface.

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 abrupt backward displacement of the output shaft when the solenoid 27 is energized is converted into rotation of the rotating body 42 by the wire rope 43, and this rotation is transmitted to the rotating shaft 41 of the damper 38.

The damper 38 is fixed to the shaft 36 via the damper mount 37 and the one-way clutch 60. A large load is applied to the output shaft of the solenoid 27 by the inertia of the inertia body 40 of the damper 38, and the output shaft of the solenoid 27 is Displace slowly.

Accordingly, the pen-up plate 26 driven by the solenoid 27 descends slowly. At this time, the rope 4 by the solenoid 27 is
3 can be prevented from changing suddenly, and the pen arm 13 can be lowered smoothly. When the power supply to the solenoid 27 is released, the output shaft is in a free movement state in the protruding direction. As a result, the pen-up plate 26 rotates about the shaft 33 by the tensile force of the return spring 28, and the long portion 26c rises.

As the long 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.

Pen-up plate 2 at the time of pen-up
6 is transmitted to the rotating shaft 41 of the damper 38 via the wire rope 43 and the rotating body 42. At this time,
On the other hand, the outer diameter portion of the clutch 60 rotates freely in response to the swing of the pen-up plate 26 in the direction in which the long portion 26c rises, so that the inertia force of the damper 38 does not act on the rotating body 42, 26 rises rapidly and becomes slow at the highest position by the action of the cushion spring 61.

The raising operation of the pen-up plate 26 will be described in more detail with reference to FIG. When the pen-up plate 26 is lowered, the pen-up return spring 28 is extended by the suction force of the solenoid 27 (FIG. 4A).

When the pen-up plate 26 changes from the lowered state to the raised state, the return spring 28 contracts while the output shaft of the solenoid 27 is pulled out. At this time, the cushion spring 6
No. 1 does not expand because the spring force is greater than the spring force of the return spring 28 (FIG. 4B).

When the pen-up plate 26 is raised, the output shaft of the solenoid 27 stops being pulled out, and the amount of contraction of the return spring 28 decreases because the return spring 28 attempts to extend the cushion spring 61 (see FIG. 4). 4C).

That is, when the pen-up plate 26 is moved from the lowered position to the raised position, the speed is initially high, but when the pen-up plate 26 is at the maximum raised position, the cushion spring 61, whose spring force is stronger than that of the return spring 28, is extended to lower the speed.

[0040]

According to the present invention, since the damper mechanism is provided in the drive system of the pen-up plate as in the case of ascent, the impact when the pen lands can be reduced, and the pen can be soft-landed. Further, a sudden change in the tension of the rope caused by the solenoid can be prevented by the cushion spring, and the pen arm can be raised and lowered smoothly. Also, when the pen is lifted, the clutch freely rotates and the pen arm rises quickly, so that the drawing speed does not decrease. Further, when the pen-up plate rises to the maximum position, the speed is reduced by the cushion spring. However, there is an effect that the liquid does not jump from the pen-up plate.

[Brief description of the drawings]

FIG. 1 is a perspective view of a state in which a top plate of a casing is removed.

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

FIG. 3 is a sectional view of an oil damper.

FIG. 4 is an operation explanatory view of a pen lifting mechanism.

FIG. 5 is a time chart showing the operation of the pen lifting mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Bracket 3 Bracket 4 Bracket 5 Bracket 6 Y axis guide axis 7 Y axis guide axis 8 X axis guide axis 9 X axis guide axis 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 Return Spring 29 Bracket 30 Bracket 31 Pen Arm Bar 32 Spring 33 Rotation Center Axis 34 Rise 35 Stopper 36 Fixed Axis 37 Mounting Stand 38 Damper 39 Casing 40 Inertial body 41 Rotary shaft 42 Rotary body 43 Wire rope 60 One-way clutch 61 Cushion spring

Claims (2)

(57) [Claims] 1. A cursor 12 is supported in a casing 1 so as to be movable in two axial directions. A rear part of a pen arm 13 whose tip projects forward of the casing 1 is attached to the cursor 12 with respect to the longitudinal direction of the pen arm 13. A pen-up plate 26, which is rotatably supported at a right angle and about a substantially horizontal axis with respect to the bottom plate 1a of the casing 1 and is disposed over the entire length of the movement path of the pen arm 13 in the parallel movement direction, is attached to the casing 1. The pen-up plate 26 is connected to the output shaft of a solenoid 27 via a rope 43, and the pen-up plate 26 is connected to a return spring 28 which urges the pen-up plate 26 in the ascending direction. The pen arm 13 is connected to the pen-up plate 2 so that the tip of the pen arm 13 moves up and down in conjunction with the elevation of the pen-up plate 26.
6, the pen-up plate 26 of the automatic drawing device is configured to be driven in the downward direction against the urging force of the return spring 28 by driving the solenoid 27. A rotating body 42 which engages with the rope 43 and rotates in conjunction with the elevation of the pen-up plate 26.
When the rotation of the rotating body 42 is performed in conjunction with the lowering of the pen-up plate 26, the rotational force of the rotating body 42 is transmitted to the damper 38 and the pen-up plate 26 of the rotating body 42 is transmitted.
When the rotation is interlocked with the rise of the clutch, the rotational force of the rotating body 42 is set so as not to be transmitted to the damper 38, while the rotation between the clutch 60 and the output shaft of the rotating body 42 and the solenoid 27 is reduced. And a cushion spring 61 disposed on the transmission path of the step 43. 2. The pen lift mechanism according to claim 1, wherein the elasticity of said cushion spring 61 is made stronger than that of said return spring 28.