JPH0149633B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a printing mechanism of a flying space printing method using an ink ribbon.

Conventionally, a flying printing type printing mechanism using an ink ribbon is generally used. This printing mechanism includes a hammer, a hammer driving means, a type wheel (type accommodating body) in which a large number of types are supported at the tip of an elastic arm, and a desired type held by the type wheel at a printing position. Printing is performed by indexing and printing desired characters one after another while continuously moving a carrier equipped with a selection means for selectively indexing at a predetermined speed, and the carrier stops each time a printing operation is performed. Since there is no lag, it is possible to speed up the printing operation.

With this type of printing mechanism, when the print medium is thin, the contact time between the print medium and the type is short and there is no problem; however, when the print medium becomes thicker, the contact time between the print medium and the type increases, resulting in the following problems. occurs.

That is, in FIG. 1a showing the printing state,
The hammer 1, which is continuously spaced in the direction of the arrow A, is driven in the direction of the arrow B by a hammer driving means (not shown), and moves the type 2 indexed to the printing position onto the ink ribbon 3 or a thick print medium 4 such as a bankbook. Printing is performed by pressing the platen 5 through the platen 5. In this case, since the print medium 4 is thick, the type 2 digs deeply into the print medium 4 as shown in the figure, and the ink ribbon 3 sent in the same direction as the hammer 1 is temporarily stopped and a large tension is applied to the ink ribbon 3. It takes. Further, the type 2 is stopped in this state (the arm of the type accommodating body to which the type 2 is attached is elastically deformed), and only the hammer 1 continues to move in the direction of arrow A. When the hammer 1, which has completed printing, retreats to the position shown in FIG. 1b, the type 2 is removed from the print medium 4. Until now, the hammer 1 has moved by a distance a in the direction of the arrow A, but this amount is much larger than in the case of a thin print medium. In this state, the printing type 2 attempts to return to its normal state by moving by a distance a in the direction of arrow A as the arm restores its natural state, but this movement
The type 2 is pulled in the same direction by the ink ribbon 3, which is moving in the direction of arrow A due to the tension stored so far, and becomes even larger, and in the end, the type 2 temporarily moves by a + b in the direction of arrow A, and then When the hammer 1 is further moved back, it moves back by b and returns to its normal state. In this way, when the hammer 1 retreats after printing is completed, the type 2 moves a lot, so when printing "A", for example, the second
This results in printing with lateral deviation as shown by the horizontal lines in the figure, resulting in a decrease in printing quality.

The present invention is intended to solve the above-mentioned problems,
It is an object of the present invention to provide a printing mechanism using a flying space printing method that can perform good printing even on thick printing media.

According to the present invention, the above object is to move a carrier having a large number of type characters and a type accommodating body in which the type characters are supported at the tip of an elastic arm continuously in a space at a predetermined speed; In the printing mechanism of the flying space printing method, in which printing is performed by pressing the type indexed at the printing position against the platen via the ink ribbon and printing medium with a hammer, the ink ribbon is always fed in the opposite direction to the space direction during the space. This is achieved by a printing mechanism characterized by having a ribbon feeding means that causes the printing to occur.

An embodiment of the invention will now be described with reference to FIG.

FIG. 3 is a schematic diagram of a printing mechanism according to the present invention, in which 11 is a hammer, 12 is a type, 13 is an endless ink ribbon, 14 is a ribbon cassette, and 15 is a platen.

The hammer 11 and type 12 have the same structure and function as conventional ones.

In addition, the endless ink ribbon 13 is provided with a ribbon feeding means that always feeds the endless ink ribbon 13 in a direction opposite to the space direction during the space, so that the endless ink ribbon 13 is moved in the direction of arrow A in the opposite direction to the carrier space movement direction, which is opposite to the conventional one. ’ direction. still,
The ink ribbon 13 may move continuously or may move intermittently only during printing.

As a result, when the hammer 11 completes printing on the print medium 4 and begins to retreat, and the type 12 biting into the print medium 4 comes out of the print medium 4,
The type 12 attempts to return to its normal state by moving the distance a' that the hammer 11 has moved in the direction of arrow A, but this movement is prevented by the ink ribbon 13 moving in the direction of arrow A', which is opposite to the conventional movement. 12 is reduced by being pulled in the same direction, and as a result, the type 12 temporarily moves by a'-b' in the direction of arrow A,
Thereafter, when the hammer 11 retreats further, it moves forward by b' and returns to its normal state.

Therefore, the type 2 hardly moves until it is separated from the print medium 4, and the print quality is improved.

As described above, according to the present invention, by setting the ink ribbon feeding direction in the opposite direction to the carrier space direction, the problem of lateral printing deviation when printing on thick printing media is solved, and printing quality is improved even at high speeds. It is possible to improve

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of character movement when printing on a thick printing medium, FIG. 2 is an explanatory diagram of the same printing deviation, and FIG. 3 is a schematic diagram showing an embodiment of the printing mechanism according to the present invention.
4 is a printing medium, 11 is a hammer, 12 is a type, 13
1 is an endless ink ribbon, and 15 is a platen.

Claims (1)

[Scope of Claims] 1. A carrier having a large number of printed characters and equipped with a printed character accommodating body in which the printed characters are supported at the tip of an elastic arm is moved continuously at a predetermined speed and assigned to a printing position. In a printing mechanism of a flying space printing method in which printed characters are pressed against a platen through an ink ribbon and a printing medium by a hammer, the ribbon feeding means always feeds the ink ribbon in a direction opposite to the space direction during the space. A printing mechanism characterized by having.