JP2003341202A - Dot line printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of necessity of enough space for working with a driver at the side of a casing in adjusting the position of a ribbon guide in a prior art. <P>SOLUTION: In a dot line printer having a hammering mechanism, a shuttling mechanism, a paper feeding mechanism, an endless ink ribbon, a roller driving section for driving the endless ink ribbon, a main brake section for giving tension to the endless ink ribbon, a ribbon guide having a positional adjusting mechanism for adjusting the running position of the endless ink ribbon and a platen for holding the striking power, characters and figures in the shape of dot matrix are printed by properly releasing a printing hammer during the process of a shuttling action between the hammering mechanism and the platen through the endless ink ribbon and a printing paper. The positional adjusting mechanism of the ribbon is made to be accessible with the driver from above the casing. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a ribbon guide adjusting mechanism for defining a running position of an ink ribbon in a dot line printer. 2. Description of the Related Art A conventional method for adjusting the running position of an ink ribbon will be described with reference to FIGS. 1 and 3. FIG. In the dot line printer, a hammer mechanism 1 having a hammer pin (not shown) is reciprocated in a digit direction by a shuttle mechanism (not shown). A hammer pin is driven with respect to the printing paper 3 to transfer the ink of the ink ribbon 2 to the printing paper 4 to print characters, graphics, and the like in the form of a dot matrix. The ink ribbon 2 is an endless type ribbon housed in a cassette 5, and the ink ribbon 2 coming out of a main brake portion 7 of the cassette 5 passes through a gap between the platen 3 and the hammer mechanism 1, and is provided with a ribbon guide. 8. Folded into the cassette 5 via the ribbon roller unit 6. In the process of printing, the ink ribbon 2 is driven in one direction by a motor (not shown) so as not to be hit by the hammer pin at the same place in the printing process (in FIG. 1, from left to right of the hammer mechanism 1). Direction), and at this time, tension is applied to the ink ribbon 2 on the opposite side of the ribbon roller section 6 with the hammer mechanism section 1 therebetween so that the ink ribbon 2 does not loosen on the front surface of the hammer mechanism section 1. Main brake unit 7 is provided. The ink ribbon 2 is disposed so as to run obliquely with respect to the pin arrangement direction of the hammer mechanism 1. In the example shown in FIG. 1, the left end of the hammer mechanism 1 is above the ink ribbon 2 and the right end. , The ink ribbon 2 is run so that the lower side is hit, and the ink ribbon 2 is hit uniformly in the width direction. 9 is the ink ribbon 2
The roller is free to rotate in the traveling direction. As described above, since the ink ribbon 2 runs obliquely with respect to the pin arrangement direction of the hammer mechanism 1, the running load of the ink ribbon 2 changes depending on the print density, and the hammer mechanism 1 In the vicinity of the right end of No. 1, the running of the ribbon may become unstable. It is necessary to make adjustments so that the ink ribbon 2 does not deviate from the running path even when the printing density changes in the actual use condition of the dot line printer. Therefore, regardless of the printing density, the ink ribbon 2
Guide 8 so that the
The position is adjusted. Although it is assumed that the position adjustment of the ribbon guide 8 is performed at the time of assembling at a factory or at the time of maintenance work involving replacement of parts, in the prior art, it is fixed with screws 13b as shown in FIG. Since the position of the ribbon guide 8 is adjusted by loosening the screw 13b using a screwdriver from the lateral direction of the housing, a space is required on the lateral side of the housing at the time of adjustment so that work using the driver is possible. In the prior art, there is a problem that, depending on the use condition of the dot printer, it is necessary to move the housing during maintenance work to secure a work space. For this reason, it is necessary to provide a configuration in which the position of the ribbon guide can be adjusted even when there is no space on the side of the housing during the maintenance work. According to the present invention, a ribbon guide has a two-part structure consisting of a freely rotatable ribbon guide and a ribbon guide supporter for positioning the ribbon guide, and a ribbon guide is provided by a driver from above the housing. The supporter is configured to be able to access the fixing screw. DETAILED DESCRIPTION OF THE INVENTION The present invention will be described with reference to FIGS. 1 and 2, the same parts as those in FIG. 3 are denoted by the same reference numerals. The ribbon guide 8 is moved in the direction of the arrow (A
B) is attached to the rotating shaft 12 so as to be freely rotatable. The ribbon guide 8 receives a force in the direction of arrow A due to the tension of the running ink ribbon 2. Ribbon guide supporter 1
Numeral 0 is fixed to the housing via a long hole 11 with a screw 13a, and can be adjusted in the arrow direction C in the figure. The ribbon guide supporter 10 is mounted at a position above the center of rotation (rotation axis 12) of the ribbon guide 8, and the position of the ribbon guide 8 is determined by fixing the ribbon guide supporter 10. According to such a configuration, the ribbon guide 8
Can be adjusted by the driver from above the housing, and the position adjustment of the ribbon guide 8 can be performed even if there is no space on the side of the housing during the maintenance work. According to the present invention, the position of the ribbon guide can be adjusted from above the dot line printer housing.
Even if there is no working space on the side of the housing, the position of the ribbon guide can be adjusted.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of the present invention. FIG. 2 is a detailed view showing an embodiment of the present invention. FIG. 3 is a detailed view showing a conventional technique. [Description of Signs] 1 ... Hammer mechanism section 2 ... Ink ribbon 3 ... Platen
4 printing paper, 5 cassette, 6 ribbon ribbon unit, 7
... Main brake part, 8 ... Ribbon guide, 9 ... Roller, 10
... Ribbon guide supporter, 11 ... Long hole, 12 ... Rotating shaft 1
3a: Screw.

Claims (1)

Claims: 1. A hammer mechanism having a plurality of print hammers, a shuttle mechanism for reciprocating the hammer mechanism in a beam direction, and a paper feed mechanism for feeding printing paper perpendicular to the beam direction. And an endless ink ribbon that is stored in a folded state in a ribbon cassette and is driven in the direction along the front side of the hammer mechanism, a roller driving unit for driving the endless ink ribbon, and a roller driving unit. A main brake portion disposed on the opposite side of the hammer mechanism portion for applying tension to the endless ink ribbon, and a position adjusting mechanism for adjusting a traveling position in a vertical direction with respect to a traveling direction of the endless ink ribbon. It has a ribbon guide and a platen for holding the impact of the print hammer,
A dot line that prints characters and figures in a dot matrix form on the printing paper by releasing the printing hammer as needed during the shuttle operation via the endless ink ribbon and the printing paper between the hammer mechanism and the platen. 2. A dot line printer according to claim 1, wherein said ribbon guide position adjusting mechanism is accessible to a driver from above the housing.