JP2969486B2 - 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 the tip is pivotally supported by a cursor linked to the shaft drive mechanism, and the tip of the pen arm is arranged to protrude from the opening of the casing to the front of the casing,
The pen arm is placed on the pen-up board by its own weight, the cursor is driven in the X-axis and Y-axis directions, and the pen-up board is moved up and down. Is disclosed in Japanese Patent Laid-Open Publication No. 1-148389.

[0003]

In the above automatic image drawing device, 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 upright. In such a case, the pen arm might not be lowered. Also, when the pen is down, the pen touches the screen due to its own weight and the weight of the pen arm,
There is an inconvenience that the writing pressure is different between an upright state and a flat state.

When the pen is lifted, the pen-up plate is raised at a high speed by the return spring, but at this time, the pen arm is raised from the pen-up plate, and the response at the time of the next pen down is deteriorated. There was a problem.
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 movably in two axial directions within a casing 1 mounted on a mounting surface such as a drawing board. A rear part of a pen arm 13 whose tip projects forward of the casing 1 is rotated by a cursor 12 about an axis perpendicular to the longitudinal direction of the pen arm 13 and substantially horizontal to the bottom plate 1 a of the casing 1. A pen-up plate 26 pivotally supported and disposed over the entire length of the movement path of the pen arm 13 in the parallel movement direction is supported on the casing 1 so as to be able to move up and down, and the pen-up plate 26 is linked to an up-down drive mechanism, The pen arm 1 is provided on the upper surface of the plate 26.
3 is mounted on the lower surface of the pen-up plate 26, and the pen arm 13 is moved up and down with respect to the mounting surface in conjunction with the elevation of the pen-up plate 26. A pen arm bar 31 is disposed above and below the pen arm bar 31 so as to be able to freely move up and down, and the upper surface of the pen arm 13 is slidably contacted with the lower surface of the pen arm bar 31, and the pen arm bar 31 is attached to the pen up plate 26. The pen arm 13 is pressed against the pen-up plate 26 by the urging force, and the pen P, which is held by the pen arm 13 when the pen-up plate 26 is lowered when the pen is down, is pressed. The pen arm is set at a position where the tip of the pen P is further lowered after the tip abuts on the screen.
The urging force of 1 is applied as pen pressure.

[0006]

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

The urging force of the pen arm bar 31 is set to such a magnitude that the pen arm 13 is lowered in conjunction with the pen-up plate 26 when the screen is upright. The pen-up plate 26 further descends after the tip of the pen P held by the pen arm 13 contacts the screen when the pen is down,
When the pen is down, the urging force of the pen arm 31 is applied as a pen pressure between the tip of the pen P and the screen.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of the present invention will be described below in detail with reference to 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 moved by a lifting / lowering 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.

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.

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

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. 33 are supported.

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

The pen arm bar 31 is connected to the spring 15
Is downwardly urged by a spring 32 having a spring force larger than the spring force of the pen arm bar 3.
1 penetrates the upper surface of the pen arm 13 and pushes the pen arm 13 against the elastic force of the spring 15 so that the pen-up plate 2
6 is pressed against the upper surface of the long portion 26c.

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

The pen-up plate 26 has a long portion 26
c is urged by a spring 28 in the upward direction, and the urging force causes the pen-up plate 26 to move to 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 denotes a stopper formed at an end of one side 26a of the pen-up plate 26.

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

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

A wire rope 43 is hung on the rope groove of the rotating body 42. One end of the wire rope 43 is connected to an output of a solenoid 27 fixed to the bottom plate 1a via a cushion spring 61 connected to the wire rope 43. The other end of 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. The leading end of P comes into contact with the screen, that is, the sheet on the mounting surface.

As shown in FIG. 4, since the pen-up plate 26 slightly descends even after the pen P contacts the screen, the pen arm 13 is moved from the pen-up plate 26 when the pen-up plate 26 is in the lowest position. As shown in FIG. 4C, the gap G is separated and the spring 31 bends, so that a pen pressure is applied to the pen P on the screen.

The pen-down movement is performed relatively slowly by the damper action of the damper 38 despite the rapid operation 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 transmitted to the rotation shaft of the damper 38 via the wire rope 43 and the rotating body 42, and a large load is applied to the output shaft of the solenoid 27 by the inertia of the inertia body of the damper 38. , And the output shaft of the solenoid 27 slowly retreats.

Accordingly, the pen-up plate 26 driven by the solenoid 27 descends slowly. Solenoid 2
When the energization of the output shaft 7 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 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. The swinging 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, and the inertial force of the damper 38 does not act on the rotating body 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.
6 is prevented by the downward biasing force of the pen arm bar. As is clear from the above explanation,
The solenoid 27 and the spring 28
In the elevating direction.

Next, another embodiment of the support mechanism of the pen arm bar will be described with reference to FIGS. Pen-up board 2
A projecting piece 40 (the other is not shown) is fixed to both side portions 26 a (the other is not shown) of the sixth arm 6, and a support shaft 46 is fixed in the hole of the projecting piece 40 at both ends of the pen arm bar 44 at right angles. It is slidably inserted. One end of a tension coil spring 48 fitted on the support shaft 46 is locked to the protruding piece 40, and the other end is locked to the pen arm bar 44. Other configurations are the same as those of the first embodiment.

In the above configuration, the pen arm bar 4
4 is urged in the downward direction by the tensile force of the extension coil spring 48, and presses the pen arm 13 against the upper surface of the pen-up plate 26. When the pen is down, the pen-up plate 26 is lowered so that the pen-up plate 26 is further lowered after the pen P is locked on the screen. 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 a pen pressure is generated on the pen P by the bending of the tension spring 48.

[0040]

According to the present invention, as described above, since the pen-up plate and the pen arm follow up and down, the responsiveness of the pen-down operation can be improved.
Since the pen pressure is generated by the movement, the pen arm surely descends even when the screen is upright, and the pen pressure is substantially constant when the screen is upright or flat.

[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 perspective view of a main part.

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

FIG. 5 is a perspective view showing another embodiment.

FIG. 6 is a side view showing another embodiment.

[Explanation of symbols]

 DESCRIPTION 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 Reference Signs List 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 axis 34 Rise 35 Stopper 36 Fixed shaft 37 Mounting stand 38 Damper 40 Protrusion Piece 42 rotating body 43 wire rope

Claims (1)

(57) [Claims] 1. A cursor 12 is supported in a casing 1 mounted on a mounting surface such as a drawing board so as to be movable in two axial directions.
The rear part of the pen arm 13 whose tip projects forward of the casing 1 is rotatable about the axis perpendicular to the longitudinal direction of the pen arm 13 and substantially horizontal to the bottom plate 1 a of the casing 1. A pen-up plate 26 is supported by the casing 1 so as to be able to move up and down, and the pen-up plate 26 is linked to a lifting drive mechanism. A pen elevating / lowering pen of an automatic image liner in which the lower surface of the pen arm 13 is placed on the upper surface of an up plate 26 and the pen arm 13 is moved up and down with respect to the placing surface in conjunction with elevating the pen up plate 26 In the mechanism,
A pen arm bar 31 is disposed above and below the pen-up plate 26 in parallel with the pen arm bar 31 so as to be able to move up and down, and the upper surface of the pen arm 13 is slidably abutted against the lower surface of the pen arm bar 31. The pen arm 13 is urged in a direction approaching the pen-up plate 26, and the urging force presses the pen arm 13 against the pen-up plate 26,
The lower position of the pen-up plate 26 when the pen is down is set to a position where the tip of the pen P held by the pen arm 13 is further lowered after the tip of the pen P contacts the drawing screen. Wherein the urging force of the pen arm 31 is applied as a pen pressure between the pen and the arm.