KR930001303Y1 - Driving device of carriage in pen plotter utilizing solenoid - Google Patents

Abstract

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Description

Carriage drive device of pen plotter using solenoid

1 is an exemplary view of a carriage driving apparatus according to the present invention.

2 is a drive circuit diagram in the solenoid driver of the present invention.

3 is a schematic explanatory diagram of a carriage driving device including a conventional voice coil;

* Explanation of symbols for main parts of the drawings

1: carriage body 2: carriage cylinder

2a: guide hole 4: rod

3, 3a: dry bearing 5: pen holder

9: pen

The present invention minimizes the load on the pen carriage and minimizes the load of the pen carriage during the up / down and hold of the color pen drawn by the electrical action of the solenoid, especially in a pen plotter which performs a planar drawing rule using a color pen. The present invention relates to a carriage drive device of a pen plotter to enable softlanding.

In the conventional pen carriage driving device, as shown in FIG. 3, the voice coil 22 is mounted on the carriage 21 to increase the output capacity of the DC motor driving the motor due to an increase in the carriage weight and a motor drive amplifier (not shown). Capacity of the pen holder 23 is increased and the manufacturing cost of the carriage driving mechanism is increased by using the expensive voice coil 22, and the pen holder 23 does not have a shock absorber. There was a problem that the seam of (24) was broken or the voice coil drive circuit was overloaded.

Therefore, the purpose of the present invention is to adopt a solenoid with a small volume and light weight, to pen down the pen holder, but separate the solenoid from the carriage, and the pen holder mounted on the rod reciprocating inside the sealed carriage cylinder has a spring and air pressure of the upper and lower cylinders. It is possible to provide a carriage drive device of a novel pen plotter that can reduce the load of the carriage and add break times to the solenoid drive circuit to prevent the pen-down operation.

Hereinafter, preferred embodiments for achieving the object of the present invention will be described in detail.

1 is an exemplary view of a carriage driving device according to the present invention, and the solenoid 7 for driving the pen holder 5 is separated from the carriage body 1 of the pen plotter, and is operated by the solenoid driving means SD. When the vertical end 6a of the movable iron core 7a of the solenoid 7 to be sucked and discharged and the vertical end 6a of the up-down lever 6 rotated in the radial direction supported by the shaft center are operated, the horizontal end of the uplift lever 6 6b) drives the pen holder 5 reciprocating inside the carriage cylinder 2 up and down.

The pen holder 5 is mounted to the rod 4 inside the carriage cylinder 2 through a guide hole 2a axially opened on the surface of the sealed carriage cylinder 2 and the rod 4 is a dry bearing 3. The axial movement follows the induction of 3a).

Therefore, when the pen 9 mounted on the pen holder 5 is caught in the flat uneven portion during drawing, it is sealed by the buffer spring 8 and the dry bearing 8a at the upper and lower portions of the carriage cylinder 2. The pen holder 5 does not break the pen nib because the pen holder 5 is easily buffered by the air pressure of the enclosed cavity 8a to easily insert the uneven portion.

2 shows a solenoid driving circuit diagram.

The pen up and down will be described with reference to this driver circuit.

First, when a high signal is inputted to the power supply terminal Vcc1 of the solenoid driving means SD, the transistor TR3 is "Off" and the transistors TR1 (TR2) are "ON". However, since R3 > Rs, the solenoid power supply terminal Vcc2. The current IS by flows in the " + " direction of the solenoid 7 and flows through the transistor TR2 to the ground GND.

At this time, the movable core 7a is pulled by the suction force of the solenoid 7, the spring of the movable core is compressed and at the same time the horizontal end 6b of the up-down lever 6 fixed to the movable core 6b is radially downward. The pen holder attached to the rod 4 by lowering the rod 4 inside the cylinder is guided to the dry bearings 3 and 3c with the repulsive force of the spring 2b on the upper side of the sealed carriage cylinder 2 by rotating. The descent of 5) causes the pen to contact the drawing plane.

However, due to the lowering of the rod 4, the air inherent in the cavity 8a of the lower end of the closed cylinder is compressed, thereby softening the down operation of the pen holder 5.

Even if there is an unevenness on the drawing plane during pen down, the air pressure of the spring 8 and the cavity 8a above and below the carriage cylinder 2 causes the pen to move finely so that the pen can be moved finely and overloaded by the solenoid driving means SD. Will not affect.

On the other hand, when the low signal is inputted to the power supply terminal Vcc1 of the solenoid driving means SD, the transistors TR1 and TR2 are "off" and the transistor TR3 is "ON", so that no current flows in the solenoid and the transistor TR1. Since the residual current due to the delay time of TR2 affects the solenoid, it flows through the transistor TR3 to the variable resistor VR and dissipates as heat.

At the same time, the solenoid 7 is turned off when the current is cut off and is discharged by the spring of the movable iron core 7a, so that the up-down lever 6 is rotated slightly clockwise to raise the rod 4 in the carriage cylinder 2. 4) As the upper spring 8 is compressed again, the pen holder 5 is raised to raise the pen, and this prevents a sudden up phenomenon by the air pressure of the spring 8 and the cavity 8a.

As described above, the present invention can soft-land the spring and air pressure above and below the rod of the sealed carriage cylinder when the pen driven by the solenoid is up and down, thus reducing the noise and breaking the pen core without applying a load to the solenoid driver circuit. The pen holder up and down function even in the down state of the rod, thus preventing the change of pen force due to the unevenness of the seedling surface and separating the solenoid carriage, thereby reducing the DC motor load due to the carriage weight. In addition, the pen-down function can be prevented from malfunctioning due to the residual current when the solenoid drive circuit is turned off by the transistor pad (Path).

Claims (2)

Solenoid 7; An up-down lever 6 which is rotated at a predetermined angle about an axis by the solenoid 7; Soft landing of the fan while being located on the rod 4 for vertically moving the pen holder 5, the dry bearings 3 and 3a for guiding the rod, and the upper and lower portions of the carriage cylinder sealed by the dry bearing. A carriage body (1) comprising a carriage cylinder (2) composed of a spring (8) and a cavity (8a) for cushioning an elastic force and an impact as air pressure inherent in a closed space; A pen holder 5 for holding the pen 5; A carriage driving device of a pen plotter using a solenoid including a solenoid driving means (SD) for up-down control of a pen holder (5). 2. The solenoid driving means (SD) according to claim 1, further comprising: a solenoid driving transistor (TR2); A solenoid driving current blocking transistor TR3; A transistor TR1 for controlling the transistor TR3 according to a solenoid drive signal; Carriage drive device for a pen plotter using a solenoid, characterized in that it comprises a solenoid protective varistor (T1).