JPH0129093Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Technical field of invention] This invention relates to a printer.

[Technical background of the invention and its problems]

Generally, in a printer equipped with a platen, when setting paper on the platen, the carrier frame with the print head mounted is positioned at the end of the platen. The human body touches the board. Since the human body is charged with static electricity, static electricity is transmitted to the guide plate, then from the guide plate to the ratchet at the end of the platen, and then from the shaft at the end of the platen to the frame that holds this shaft.
This may be input as an erroneous signal to the PC board installed in the frame. This causes malfunction.
Because the guide plate guides the paper, it is close to the platen, and the distance between it and the ratchet is about 4 mm, resulting in static electricity of up to 4KV being blown away. If the ratchet and guide plate are made of plastic, it is possible to prevent the transmission of static electricity, but since the daytent is always pressed against the ratchet, a metal material must be used for wear resistance. The guide plate requires various indication marks to indicate the printing position and line, so if it is formed from a metal plate, the outer shape of the guide plate can be changed and a part of the edge can be used as an indication mark, or a notch etc. can be formed to provide instructions. It is also possible to make a mark, and it is easy to manufacture in this case, but if it is made of plastic, changing the external shape or forming a notch will create a thin part of the flesh and easily break.
Manufacturing is troublesome because it is necessary to form it into a simple shape and then form lines and marks indicating the printing position and printing line.

[Purpose of invention]

This idea was developed in view of the above points, and the purpose is to provide a printer that satisfies the durability of the ratchet, facilitates the production of the guide plate, and prevents malfunctions due to static electricity. be.

[Summary of the idea]

This idea provides a carrier frame that moves along the platen with a metal guide plate that guides the paper, and when setting paper, the carrier frame and the guide plate are positioned at the edge of the platen. The ratchet is covered by an insulating cover integrally formed with the paper feed pitch switching lever made of insulating material, which is provided with the ratchet made of metal material.Therefore, even if the metal guide plate is touched, static electricity will not fly from the guide plate to the ratchet. Accordingly, the guide plate can be easily formed from a metal material, and the ratchet can be formed from a metal material to improve durability.

[Example of idea]

An embodiment of this invention will be explained based on the drawings.
A ratchet 2 made of metal is fixed to the end of the platen 1 and is fed intermittently by a feeding mechanism (not shown), and a paper feed pitch switching lever 3 made of plastic that changes the feed pitch of the ratchet 2 is attached to the platen. It is rotatably provided around the 1st axis. A cover portion 4 covering the ratchet 2 is integrally formed on the paper feed pitch switching lever 3 using an insulating material.

Next, a motor 8 is attached to the carrier frame 7 that moves while being guided by the guides 5 and 6, and a wheel holder 10 that holds a daisy wheel 9 driven by the motor 8 and a hammer (not shown) is attached. Pin 1 is biased in one direction of the platen.
It is rotatably mounted around 1, and further,
A ribbon cassette 12 is detachably attached. Furthermore, the carrier frame 7 includes a platen 1.
A guide plate 13 facing the is attached via an insulating material 14, and a guide plate 17 for guiding the collect ribbon 15 and the print ribbon 16 is attached to the guide plate 13.
18 are attached by rivets 19. These guide plates 13, 17, and 18 are press-worked metal plates. A stopper 20 is bent on the guide plate 18 and abuts against the wheel holder 10 to determine the return position of the wheel holder 10.

In such a configuration, the carrier frame 7
Printing is performed while moving along the platen 1. When setting paper on the platen 1, the carrier frame 7 is moved to the edge of the platen 1 so that the work can be done in a wide space. At this time, the ratchet 2 allows conduction of electrical signals from the shaft portion 21 of the platen 1 to the frame 22;
are covered by the cover part 4, even if a human body touches the guide plates 13, 17, 18, static electricity will not fly from the guide plates 13, 17, 18 to the ratchet 2. Therefore, static electricity will not be input as an erroneous signal to a PC board (not shown) fixed to a part of the frame 22, and the operation will be performed without error.

Therefore, the durability of the ratchet 2 made of metal is increased, and the guide plates 13, 1
7 and 18 can be easily punched out from a metal plate.

[Effect of idea]

Since this device is configured as described above, it is possible to prevent static electricity from flying from the guide plate to the ratchet even if the guide plate is touched, thereby preventing malfunctions caused by erroneous signals. As a result, the ratchet can be made of a metal material to increase durability, and the guide plate can be easily punched out of a metal plate.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention.
The figure is a longitudinal side view, and FIG. 2 is a partially exploded perspective view. 1...Platen, 2...Ratchet, 3...Paper feed pitch switching lever, 4...Cover part, 7...
Carrier frame, 13, 17, 18... guide plate.

Claims (1)

[Scope of utility model registration request] A ratchet made of a metal material is connected to one end of the platen, and a paper feed pitch switching lever made of an insulating material is provided, a guide plate made of a metal plate for guiding paper is attached to a carrier frame moving along the platen, and a guide plate made of a metal plate is attached to the carrier frame moving along the platen. A printer characterized in that a cover part made of an insulating material is integrally formed on the paper feed pitch switching lever so as to face the front surface of the guide plate and cover the ratchet when the frame moves to the ratchet position.