JPH0815838B2 - Pen lifting device in recording device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pen lifting device for a recording apparatus, and more particularly to a pen lifting device for a plotter device.

(Prior Art) FIG. 4 shows a conventional plotter apparatus for drawing, 1 is a platen, 2 is recording paper, 3 is a pen carriage, 4 is a pen,
Reference numeral 5 is a recording paper drive roller, 6 is a pinch roller, 7 is a carriage guide shaft, 8 is a pen stocker, and 9 is a recording pen holding device with the carriage guide shaft 7 as a center for rotating the pen carriage 3 with respect to the carriage guide shaft 7. Arm provided at a position facing the, 10
Is a pen up-and-down device for driving the arm 9 up and down, the paper 2 is moved in the X direction on the platen 1 by the driving roller, and the pen carriage 3 is moved in the Y direction.
The paper is printed on the paper 2 by the pen 4.

FIGS. 5 and 6 show the pen up-and-down device 10, 11 is a lever whose one end lower surface is in contact with the upper surface of the arm 9 of the pen carriage 3, and 12 is a shaft which rotatably supports this lever 11. , 13 is a plunger that supports the other end of the lever 11, 14 is a direct-acting solenoid as an actuator that moves the plunger 13 up and down, 15 is a compression spring for returning the plunger, and 16 is projected from the lower surface of the central portion of the lever 11. It is an ascending position control arm.

FIG. 5 shows the state in which the pen 4 is separated from the paper 2,
The figure shows a state in which the pen 4 is in contact with the paper 2. Now, as shown in FIG. 6, the linear solenoid 14 is energized so that the pen 4 moves the paper 2
When the energization of the solenoid 14 is cut off while it is in contact with, the result is as shown in FIG. In FIG. 5, the direct-acting solenoid 14 is not energized, so that the return compression spring 15 provided in the plunger 13 of the solenoid 14 raises the other end of the lever 11 to a predetermined position. The lever 11 is rotatable around the lever support shaft 12, and the regulating arm 16 integrated with the lever 11 rotates in the direction of the arrow in the figure as the other end of the lever 11 rises. A stopper 17 for restricting the rotational movement of the restriction arm 16 is provided in the vicinity of the arm 16, and therefore, the rising position restriction of the other end of the lever 11 by the return compression spring 15 is performed at a position where the arm 16 and the stopper 17 are in contact with each other. Regulated. The pen 4 is lifted from the paper 2 by the plunger 13 of the linear solenoid 14 being lifted by the restoring compression spring 15, but the pen rising position is regulated at the position where the regulating arm 16 and the stopper 17 are in contact with each other as described above. .
The position of the stopper 17 is determined so that the pen 4 is surely separated from the paper 2 and has a predetermined relation position with the height position of the pen stocker 8 accommodating a plurality of replacement pens, so that the pen replacement is surely performed. The pen tip and the paper 2 are positioned so that the distance between them is about 4 to 5 mm. However, the position of the stopper 17 is adjusted during the assembly process of the device, due to the finish accuracy and assembly accuracy of the individual components.

(Problems to be Solved by the Invention) In such a pen up / down device 10, a solenoid as small as possible is adopted from the viewpoint of economical efficiency such as a manufacturing cost of the device, while a high-speed operation of lifting and lowering the pen is performed. In view of the above, a return compression spring 15 is used which has a minimum return force necessary for raising the pen holder in proportion to the attractive force of the solenoid. For this reason, when such a return spring is used as shown in FIG. 3, the return spring force P2 obtained at the pen-up position (1) is the pen-up by adjusting the position of the stopper 17 as described above. When changed to the position (2), the return spring force decreases to P3, and as a result, it may be impossible to raise the pen holder to a predetermined position. In order to correct this problem, it is necessary to reposition the pre-fixed solenoid and re-fix it. As described above, the conventional example has a drawback that many adjustment steps are required, resulting in an expensive apparatus. The present invention
An object of the present invention is to provide a recording apparatus that surely raises a pen holder without requiring special adjustment man-hours, and is inexpensive and has high-speed pen response.

The pen lifting device in the recording apparatus of the present invention includes a pen carriage rotatably supported by a carriage guide shaft, a pen holder provided at one end of the pen carriage, an arm formed at the other end, and an arm that moves up and down. A pen up / down device including an actuator for moving, a position adjustable stop means for constraining the pen up position by the pen up / down device to a predetermined position, and the pen up / down device interposed between the stop means and the pen up / down device. It is characterized in that it comprises a returning means of the device, and the returning force of the returning means is constant even if the position of the stopping means changes.

(Operation) According to the pen lifting / lowering device of the recording apparatus of the present invention, the restoring force of the pen up / down device is sufficient and always constant even if the position of the stopper changes.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

In the present invention, as shown in FIGS. 1 and 2, instead of using the return compression spring 15 inserted between the plunger 13 and the solenoid 14, an extension spring 19 is provided on the side surface of the restriction arm 16 and the restriction arm 16. Is connected to a stopper 17 extending from a stopper 17 facing the side surface of the pen, and the relationship between the restoring force of the extension spring 19 for returning and the pen lifting position is at the pen down position as shown in FIG. The return force at P1 is P1 and the return force at pen-up position (1) is always P2.

Since the device of the present invention has the above-mentioned structure, even if the position of the stopper 17 is moved to the left or right in FIG. 1 for the purpose of changing the restricting position of the pen rising, for example, the extension rod 18 of the stopper 17 and the restricting arm. Since the amount of flexure of the return spring 19 coupled between 16 during pen-up is always moved in a fixed relationship, there is no need for re-adjustment to correct the imperfect pen rise seen in the conventional example. This makes it possible to provide an inexpensive device as a result.

(Effect of the Invention) As described above, according to the device of the present invention, there is a great advantage that the position adjustment of the stopper or the like is unnecessary.

[Brief description of drawings]

1 and 2 are explanatory views of a pen up / down device of the present invention,
FIG. 3 is a diagram showing the relationship between the vertical position of the pen and the return spring force,
FIG. 4 is an explanatory view of the recording apparatus, and FIGS. 5 and 6 are explanatory views of a conventional pen lifting structure. 1 ... Platen, 2 ... Recording paper, 3 ... Pen carriage, 4 ... Pen, 5 ... Recording paper drive roller, 6 ... Pinch roller, 7 ... Carriage guide shaft, 8 ...
Pen stocker, 9 ... Arm, 10 ... Pen up / down device, 11
…… Lever, 12 …… Shaft, 13 …… Plunger, 14…
… Direct acting solenoid, 15… Compression spring for plunger return,
16 …… Lifting position regulation arm, 17 …… Stopper, 18 …… Hanging rod, 19 …… Extension spring for return.

Claims (1)

[Claims] 1. A pen carriage rotatably supported by a carriage guide shaft, a pen holder provided at one end of the pen carriage, an arm formed at the other end, and an actuator for vertically moving the arm. A pen up / down device, a position-adjustable stop means for restraining a pen-up position by the pen up / down device to a predetermined position, and a return means for the pen up / down device interposed between the stop means and the pen up / down device. The pen lifting device in a recording apparatus, wherein the returning force of the returning means is constant even if the position of the stopping means changes.