JPH0729466B2 - Printer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] The present invention prevents the occurrence of print unevenness in a printer equipped with a stationary ribbon cassette in which a ribbon is always fed in one direction with a feed amount smaller than the feed amount of a reciprocating carrier. The purpose is to prevent this, and the aim is achieved by setting the feeding amount of the ribbon so that a new portion of the ribbon is always used at every printing.

[Industrial application field]

The present invention relates to a printer device equipped with a stationary ribbon cassette.

In this type of printer device, when the carrier reciprocates, the ribbon is always fed in one direction with a feed amount smaller than the feed amount of the carrier. In order to perform good printing without density unevenness with this printer device, it is necessary to appropriately set the relationship between the carrier feed amount and the ribbon feed amount.

[Conventional technology]

FIG. 2 is an explanatory view of the relationship between the carrier feed amount and the ribbon feed amount in the conventional printer device, in which 1 is the print head 2
And a carrier 3 having a ribbon. Carrier 1
Printing is performed by the print head 2 by reciprocating between the positions (a) and (b) separated by L in the forward and reverse directions along a platen (not shown). The ribbon 3 is housed in a stationary ribbon cassette (not shown) and is driven by a space motor or the like via a ribbon feeding mechanism (not shown) to be always fed in the forward direction (when the carrier 1 moves in the forward direction and in the reverse direction). The relationship between the feed amount of the carrier 1 and the feed amount of the ribbon 3 is such that when the feed amount of the carrier 1 is 1,
The feed amount is 1/3 in the forward direction and 1/12 in the reverse direction.
The relationship between the carrier feed amount and the ribbon feed amount when one-way printing in only the forward direction is performed by this printer device will be described below with reference to the drawings.

FIG. 2 (a) shows a state in which the carrier 1 has moved by L from the dotted line state of position (a) to the position (b) in the positive direction,
During this time, the first printing is performed. When the carrier 1 moves, the ribbon 3 moves 1/3 L in the positive direction. In this case, the hatched portion of the ribbon 3 is used for printing.

Next, as shown in FIG. 2 (b), the carrier 1 moves from the dotted state at position (b) to the position (a) in the opposite direction, but printing is not performed during this period. When the carrier 1 moves, the ribbon 3 moves 1/12 L in the positive direction.

Next, as shown in FIG. 2 (c), the carrier 1 moves in the positive direction from the dotted state at position (a) to position (b),
During this time, the second printing is performed. When the carrier 1 moves, the ribbon 3 moves 1/3 L in the positive direction.

[Problems to be solved by the invention]

In the conventional printer device in which the relationship between the feed amount of the carrier 1 and the feed amount of the ribbon 3 is set as described above, the carrier 1 moves from the position (a) to the positive direction as shown in FIG. 2 (c). When the second printing is performed by moving L to the position (b), the ribbon 3 is moved in the positive direction from the state of FIG.
Since it moves by 3 L, the range A in which the two-direction diagonal lines are drawn in FIG. 2 (c) is printed twice. The value of this A is as follows.

As described above, in the conventional printer device, since a part of the ribbon is used for printing twice, uneven print density occurs.

[Means for solving problems]

The present invention provides a printer device that can solve the above-mentioned problems. As a means therefor, in the present invention, when the carrier reciprocates within the range of the distance L, the feed amount is less than the feed amount of the carrier. In a printer device equipped with a stationary ribbon cassette that accommodates ribbons each of which is fed in one direction, the relationship between the feeding amount of the ribbon and the feeding amount of the carrier is (the carrier moves in the same direction as the ribbon feeding). It is set to satisfy the following formula: Ribbon feed amount x 2 + Ribbon feed amount when carrier moves in direction opposite to ribbon feed direction ≥ Carrier feed amount L).

[Action]

In a printer that carries a stationary ribbon cassette and performs one-way printing, when the carrier moves in the same direction as the ribbon feed direction, the ribbon feed amount is twice, and when the carrier moves in the opposite direction to the ribbon feed direction. By setting the sum of the ribbon feed amount and the ribbon feed amount to be greater than or equal to the carrier feed amount L, the new portion of the ribbon is always used when the ribbon is fed in one direction according to the reciprocating movement of the carrier. Printing is started and the printing quality can be improved.

〔Example〕

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

FIG. 1 is a diagram for explaining the relationship between the carrier feed amount and the ribbon feed amount in the printer device according to the present invention. In the figure, 11 is a carrier having a print head 12, and 13 is a ribbon.

The carrier 11 is at a position L away from the position (a), (b).
The printing head 12 prints when the carrier 11 moves in the forward direction (one direction) by reciprocating in the forward and backward directions along a platen (not shown).

The ribbon 13 is housed in a stationary ribbon cassette (not shown) and driven by a space motor or the like via a ribbon feeding mechanism (not shown) to be always fed in the forward direction.

Regarding the relationship between the carrier 11 and the ribbon 13 feed amount, when the carrier 11 feed amount is 1, the ribbon 13 feed amount is always 1/3 (when the carrier 11 is moving in the forward direction and in the reverse direction).
It has become. The relationship between the carrier feed amount and the ribbon feed amount when unidirectional printing in only the forward direction is performed by this printer device will be described below with reference to the drawings.

FIG. 1 (a) shows a state in which the carrier 11 has moved from the dotted line state at position (a) to the position (b) in the positive direction by L,
During this time, the first printing is performed. When the carrier 11 moves, the ribbon 13 moves 1/3 L in the positive direction. In this case, the shaded portion of the ribbon 13 is used for printing.

Next, as shown in FIG. 1 (b), the carrier 11 moves in the opposite direction from the dotted line state of position (b) to position (a), but printing is not performed during this time. When the carrier 11 moves, the ribbon 13 moves 1/3 L in the positive direction.

Next, as shown in FIG. 1 (c), the carrier 11 moves in the positive direction from the position indicated by the dotted line at position (a) to position (b),
During this time, the second printing is performed. When the carrier 11 moves, the ribbon 13 moves 1/3 L in the positive direction.

During the second printing, while the carrier 11 moves L from the position (a) to the position (b), the ribbon 13 moves in the positive direction from the state of FIG. The rear end of the portion used for the first printing of 13 reaches the position (b).

Therefore, part of the ribbon 13 is not used for printing twice, and uneven print density does not occur.

In the above description, an example in which the ribbon 13 is fed by 1/3 L in each step of FIG. 1 has been described. Generally, the relationship between the feed amount of the carrier 11 and the feed amount of the ribbon 13 is as follows. You can set it to.

Ribbon feed amount when carrier moves in the same direction as ribbon feed × 2 + ribbon feed amount when carrier moves in the direction opposite to the ribbon feed direction ≧ carrier feed amount L [Effect of the invention] As described above, According to the invention, since printing is always performed using a new portion of the ribbon, it is possible to perform good printing without unevenness in printing density.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of the relationship between the carrier feeding amount and the ribbon feeding amount in the printer device of the embodiment of the present invention, and FIG. 2 is an explanatory diagram of the relationship between the carrier feeding amount and the ribbon feeding amount in the conventional printer device. 11 is a carrier and 13 is a ribbon.

Claims (1)

[Claims] 1. A stationary ribbon cassette in which printing is performed when a carrier reciprocates within a range of a distance L and moves in one direction, and a ribbon is fed in the one direction with a feeding amount smaller than the feeding amount of the carrier. In the installed printer device, the relationship between the feeding amount of the ribbon and the feeding amount of the carrier is [(ribbon feeding amount when the carrier moves in the same direction as the ribbon feeding direction) × 2 + (carrier is in the ribbon feeding direction) A printer device, which is set so as to satisfy the following formula: Ribbon feed amount when moving in reverse direction) ≧ (carrier feed amount L).