JPH0442276Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an opening/closing mechanism for a power supply brush in a sheet suction and transfer device.

(Prior Art) Conventionally, for example, a recording paper transport device for a drum-type plotter has sprockets provided at both ends of the drum.
The paper is mounted by engaging a sprocket hole formed in the paper, and the paper is moved in the longitudinal direction as the sprocket rotates. However, in this type of recording paper transport device, the types of paper that can be used are limited, and in the case of extremely thin paper, there are problems such as the sprocket hole being easily deformed.

Furthermore, it has been proposed to transport the paper by electrostatically adhering it to a roller to prevent slippage while transporting the paper as the roller rotates (see, for example, Japanese Patent Publication No. 13978/1983). However, in this conventional example, since the paper only comes into contact with a portion of the roller, the suction area is small, and therefore the suction force is relatively weak, so slipping tends to occur.

(Problem to be solved by the invention) Therefore, in order to solve the above-mentioned drawbacks of the conventional technology, the inventors of the present invention have developed a method for electrostatic adsorption over a large area of the roller to ensure reliable transfer without slippage. We are proposing a recording paper transport device that can. This device applies a high voltage to the core metal of the roller, which is covered with an insulating coating, and applies a first voltage to two locations on the front and back of the roller so as to approach or come into contact with the recording paper set on the roller. A second power supply brush is arranged, and the recording paper is attracted to the roller by the electrostatic force generated between the core bar of the roller and each power supply brush, and the recording paper is transferred as the roller rotates. Here, when mounting or removing the recording paper, the power supply brush must be separated from the recording paper. Also, when the recording paper is attached, it is necessary to prevent hands from coming into contact with the power supply brush.

The present invention is a power supply brush that efficiently opens and closes the first and second power supply brushes provided on the front and back sides of the roller by operating the lever once. This provides an opening/closing mechanism.

(Means for solving the problem) The roller has a rotation center rotatably supported by the left and right frames that support the roller, and has an operation handle at one end and an end of the first power supply brush at the other end. a first lever to which are each fixed, a second lever having one end rotatably supported by the frame and an end of a second power supply brush being fixed to the other end; and a link that connects the lever.

(Operation) By moving the handle, the first lever rotates, and the first power supply brush fixed to the other end approaches or separates from the front surface of the roller, and at the same time is connected to the first lever via a link. The second lever rotates, and the second power supply brush fixed to the other end approaches or separates from the back surface of the roller. Furthermore, when the power supply brush is separated from the roller by the handle, the brush protection plate whose end is held near the power supply brush fixing part of the first lever protrudes from the tip of the first power supply brush, so that hands etc. Prevent contact with the first power supply brush.

(Example) Examples will be described in detail below with reference to the drawings. 1st
The figure shows a drum-type plotter equipped with a recording paper transport device having a power supply brush opening/closing mechanism according to the present invention. In FIG. 1, numeral 1 indicates a platen, and numeral 2 indicates a recording paper set on the platen.
Guide rollers 3a and 3b guide the recording paper 2 in proximity to the front and rear sides of the platen 1; 4 is a recording head having ballpoint pens 5 in four colors; It reciprocates in the width direction of the recording paper. Reference numeral 8 indicates a separator, and reference numeral 9 indicates a handle for operating a lever of a power supply brush opening/closing mechanism provided on the left and right sides of the device, respectively.

FIG. 2 shows the main parts of the invention. Reference numeral 10 denotes a frame that supports both ends of the platen 1, the main shaft 6, the guide shaft 7, etc., respectively. Reference numeral 11 designates a first lever that rotates around the end of the main shaft 6, with one end serving as a handle for operation;
A shaft of a guide roller 3a disposed on the front surface of the platen is fixed to the other end. At this other end, in addition to the guide roller, a power supply brush 12 and a brush protection plate 13 are held. That is, the end portion 12a of the power feeding brush 12, which is arranged parallel to the guide roller 3a and has the brush cover 14, is fixed to the mounting angle 11a provided at the other end of the first lever 11. Also, the end portion 13a of the brush protection plate 13
is inserted into the slit hole 11b provided in the first lever, and the spring 15 is placed near the slit hole 11b.
One end of the brush is hooked onto a pin 13b provided at the end of the brush protection plate. 16 is a stopper that limits the operating range of the first lever 11; 17 is a brush protection plate 13;
The stopper will be explained later.

Reference numeral 21 denotes a second lever, one end of which is rotatably supported by the frame 10, and the other end of which is fixed to the shaft of a guide roller 3b arranged on the back surface of the platen. Although not shown in FIGS. 1 and 2, the second lever 21 also includes a guide roller 3b.
The end portion of the power supply brush 18 (see FIG. 3), which is arranged in parallel with the power supply brush 18, is fixed. 22 is the first lever 1
1 and the second lever 21, a link 23
is a toggle spring provided between the first lever 11 and the end of the guide shaft 7. A similar mechanism is also provided on the other frame, which is not shown here.

Briefly explaining the operation of the plotter configured in this way, high voltage is applied to the core metal of the platen 1, and the recording paper 2 set on the platen 1 is grounded at two places on the front and back sides. The supplied power supply brushes 12 and 18 are brought close to each other or in contact with each other. Corona discharge occurs between the core metal and the power supply brush, so that the recording paper 2 is charged and attracted to the platen 1.
When the platen 1 rotates, the recording paper 2 is separated from the platen 1 by the separator 8 in the advancing direction. In this way, the recording paper is transported according to the arbitrary direction of rotation of the platen 1, and is attracted to the platen 1 in a wide range between the two sets of guide rollers 3a and 3b arranged at the front and rear sides of the platen. Because of this, there is almost no slippage. On the other hand, the recording head 4 reciprocates in the width direction of the recording paper, allowing characters, figures, etc. to be drawn on the recording paper.

Next, the operation of the power supply brush opening/closing mechanism of the present invention will be described in detail. FIG. 3a shows the power supply brush 12, 1
8 is in contact with (or close to) the recording paper 2. A stopper 16 prevents the first lever 11 from moving further in the direction of arrow A. Even though the guide rollers 3a and 3b are in contact with the recording paper 2, there is no need to press them because the recording paper 2 is attracted to the platen. A brush protection plate 13 provided on the first lever 11 is pulled by a spring 15, and its tip is located slightly above the tip of the power supply brush 12 and does not touch the recording paper.
In this state, the insulator of the roller 1, for example, the rubber 25
A high voltage is applied to the core metal 26 covered with the metal core 26 , and a corona discharge occurs between the grounded power supply brushes 12 and 18 , and the recording paper 2 is charged and attracted to the roller 1 .

FIG. 3b shows a state in which the power supply brushes 12 and 18 are separated from the platen 1. When the handle of the first lever 11 is tilted in the direction of arrow B from the position shown in FIG. At the same time, a second lever 2 connected to the first lever 11 by a link 22
1 also rotates, and the power supply brush 18 and guide roller 3b
moves away from platen 1. Note that when the handle is tilted toward the B side, it is stopped by a stopper (not shown), and at the same time, a switch is opened to cut off the high voltage applied to the core bar 25. First lever 11
When it rotates to the state shown in FIG. 3b, the upper end of the brush protection plate 13 is pressed by the stopper 17 placed above the power supply brush 12, and the brush protection plate 13 is protected against the biasing force of the spring 15. The tip of the plate 13 protrudes from the tip of the power supply brush 12. In this way, it is possible to prevent the recording paper, a hand, etc. from coming into contact with the power supply brush 12 when the recording paper is attached, and the power supply brush is protected. Since the recording paper is taken in and out only from the front, there is no need to provide a brush protection plate on the second lever 21 side.

In the embodiment, the recording paper transport device of a plotter was described, but the present invention is not limited to this. It can be applied to any device that transports a sheet-like material by electrostatically attracting it to a roller.

(Effects of the invention) As explained above, according to the invention, by moving the operation handle and rotating the lever, the power supply brushes disposed on the front and rear parts of the platen are simultaneously brought close to the platen. Alternatively, it can be moved away from the platen, which greatly improves operability.Also, when the power supply brush is separated from the platen, the brush protection plate protrudes from the tip of the power supply brush, protecting the power supply brush and providing a stable Sheets can be transferred by suction.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a drum-type plotter equipped with a recording paper transport device having a power supply brush opening/closing mechanism according to the present invention, and FIG. 2 is a perspective view showing a power supply brush opening/closing mechanism according to an embodiment of the present invention. FIG. 3 is an explanatory diagram of the operation of the same embodiment. 1...Platen, 2...Recording paper, 3a, 3b...
...Guide roller, 6...Main shaft, 7...
Guide shaft, 8... separator, 9... operating handle, 11... first lever, 12, 18...
Power supply brush, 13... Brush protection plate, 15... Spring, 16, 17... Stopper, 21...
Second lever, 22...link, 25...rubber,
26... Core metal.

Claims (1)

[Claims for Utility Model Registration] (1) A high voltage is applied to the core metal of a roller coated with insulation, and a first layer is applied to the front and back surfaces of the roller by applying a high voltage to the core metal of the roller, which is placed close to or in contact with a sheet set on the roller.
and a second power feeding brush is disposed, and the sheet is attracted to the roller by electrostatic force generated between the core metal of the roller and each power feeding brush, and the sheet is transferred as the roller rotates. , a first power supply brush having a rotation center rotatably supported by the left and right frames supporting the roller, one end having an operation handle, and the other end having an end portion of the first power supply brush fixed thereto. a second lever, one end of which is rotatably supported by the frame and the other end of which is fixed to an end of the second power supply brush, and the first lever and the second lever. An opening/closing mechanism for a power supply brush, characterized in that the first and second power supply brushes are simultaneously brought close to or separated from the roller by moving the handle. (2) Claims for registration of a utility model characterized in that the first and second levers each support a shaft end of a guide roller that guides the conveyance of the sheet in the vicinity of the power supply brush fixing part. No.
The power supply brush opening/closing mechanism described in (1). (3) The first lever has, in the vicinity of the power feeding brush fixing portion, a holding portion that holds an end portion of a brush protection plate that protects the first power feeding brush by urging it with a spring, and When the first power supply brush is separated from the roller by the handle,
A utility model characterized in that the upper end of the brush protection plate is pressed by a stopper provided on the frame, and the tip of the brush protection plate is made to protrude from the tip of the first power supply brush against the biasing force of the spring. Registered Claims Paragraph (1) or (2)
The power supply brush opening/closing mechanism described in section.