JPS641087Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in endless ink ribbon cartridges used in printing equipment such as line printers.

FIG. 1 is a plan view showing an example of a line printer to which the ink ribbon cartridge of the present invention is applied. A type conveyor 3 such as a type belt driven by pulleys 1 and 2 carries an endless ink ribbon (hereinafter referred to as ribbon) 9 and a paper 5 in the printing area.
It faces the 6 groups of printing hammers via. ribbon 9
is the ribbon guide 7 provided on both sides of the printing area.
The ribbon moves along the ribbon winding roller 11 provided at the entrance side of the cartridge 8, and is sent into the cartridge 8 to be folded into a zigzag shape, and then is folded into a zigzag shape along the exit side passage 13. A predetermined tension is applied by a tension mechanism 16 composed of a spring 14 and a pressing member 15 as shown, and it is pulled out from the outlet side passage 13. Note that the outlet side passage 13 is connected to the cartridge 8.
A total of four bent walls 83, which are bent and extended toward the center from both side walls 81 and 82, respectively facing each other,
84, 85, and 86. The tension mechanism 16 is installed between the inner bending wall 83 and the outer bending wall 84, and the tension mechanism 16 is installed between the inner bending wall 85 and the outer bending wall 86 facing the pressing member 15. A pressing wall 87 connecting the bending walls 85 and 86 is provided. Therefore, by pressing the pressing member 15 against the pressing wall 87 by the spring 14, tension is applied to the ribbon 9. Further, 4 is a platen that is hit by the printing hammer 6.

The folded length of the ribbon 9 (the folded length refers to the length of the ribbon 9 in the longitudinal direction of the cartridge 8 when the ribbon 9 is folded to a width that is approximately equal to the distance between the inner walls of both side walls 81 and 82 of the cartridge 8. say)
varies depending on the degree of use of the ribbon 9 and the environment in which it is used. That is, when the ribbon 9 is in a new state immediately after use, its folded length is short, and as it is printed and used, the ribbon 9 becomes thicker due to damage, fuzz, etc., and its folded length becomes longer. In consideration of such changes in the folded length of the ribbon 9, the shape, that is, the size in the longitudinal direction of the cartridge 8 is determined so that the ribbon 9 becomes full in the longitudinal direction of the cartridge 8 when the ribbon 9 approaches the end of its lifespan. .

At this time, when not much ink is used, such as immediately after starting, the folded length of the ribbon 9 is short, and there is a gap near the outlet of the cartridge 8, that is, inside the tension mechanism 16, and as a result, the folded ribbon 9 may fall down as shown in Figure 2. This tendency becomes more noticeable in environments of use such as high temperature and high humidity because the stiffness of the ribbon 9 becomes weak.

When the ribbon 9 falls down, the ribbon 9 moves to the exit side passage 1.
3, that is, the surface of the ribbon 9 enters parallel to the cartridge bottom plate 88,
The ribbon 9 is twisted 90 degrees in the outlet passage 13 and stands up vertically, that is, the surface of the ribbon 9 is perpendicular to the cartridge bottom plate 88, and attempts to pass through the tension mechanism 16 provided in the outlet passage 13. , when this ribbon 9 is twisted 90 degrees,
Since the tension mechanism 16 has play and a gap into which the ribbon 9 can fit, the ribbon 9 wraps around the upper or lower part of the tension mechanism 16 and comes off from the tension mechanism 16.

When the ribbon 9 comes off the tension mechanism 16,
Since tension will not act on the ribbon 9, the ribbon 9 will run unstable within the printing area, causing printing defects such as omitted characters and missing characters.

The purpose of this invention is to restore the ribbon that has fallen near the exit side of the cartridge to its original state before passing through the exit path, so that the surface of the ribbon always enters parallel to the exit path. .

In the present invention, a stud for correcting the fall of the ribbon before entering the exit side passage is fixed at the lower end to the bottom plate of the cartridge and is located at a position of 1 to 5 mm below the width of the ribbon from the side wall of the cartridge. It is arranged at a position approximately 10 mm from the inner wall of the inwardly bent wall constituting the passageway, which corresponds to the width dimension of the ribbon.

The present invention will be explained below with reference to the embodiment drawings shown in FIGS. 3 and 4.

The inwardly bent wall 83 forming the exit side passage 13
A cylindrical stud 2 with a diameter of about 1.5 mm is installed at a position of about 10 mm corresponding to the width of the ribbon 9 from the side wall 81 and about 1 mm below the width of the ribbon 9 from the side wall 81.
0 is provided with its lower end fixed to the cartridge bottom plate 88.

The stud 20 and the cartridge side wall 81
The ribbon 9 is set so that it passes through the gap and then enters the outlet passage 13. If the ribbon 9 falls near the exit of the cartridge 8, first the ribbon 9 is forcibly erected at the stud 20 as follows.

That is, by winding up the ribbon 9 with the rubber roller 11, the ribbon 9 that has entered the exit side passage 13 with its ribbon surface perpendicular to the bottom plate 88 also advances. Due to the pulling force of the ribbon 9, which is located closer to the cartridge entrance than the stud 20 and whose ribbon surface is perpendicular to the bottom plate 88, the ribbon 9 falls down in front of the stud 20 so that its ribbon surface is parallel to the bottom plate 88. , attempts to pass through the gap between the stud 20 and the side wall 81, that is, narrower than the width of the ribbon 9, but is unable to do so.As a result, the bottom plate 88 slides on the surface of the stud 20 from bottom to top.
Change the ribbon surface that is parallel to the surface so that it is perpendicular to the surface of the ribbon. The ribbon surface enters the tension mechanism 16 in parallel with the outlet passage 13.
Therefore, there is no possibility that the vehicle will run off the tension mechanism 16.

The stud 20 is approximately 1 inch from the side wall of the cartridge.
It may be provided on the side wall 82 side as long as it is at a position of ~5 mm.

As described above, according to the present invention, when the ribbon falls down, it is put back upright before entering the tension mechanism provided in the exit side passage, so the ribbon does not come off the tension mechanism and travel. Printing defects such as omitted characters and missing characters can be prevented from occurring.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an example of a line printer to which the present invention is applied, and Fig. 2 shows the exit section of a conventional ink ribbon cartridge, where the ribbon falls down and the ribbon surface becomes parallel to the bottom plate. FIG. 3 is a cross-sectional plan view showing an embodiment of the ink ribbon cartridge according to the present invention, and FIG. 4 is a perspective view showing the area around the stud. In the figure, 1 and 2 are pulleys, 3 is a type conveyor, 4 is a platen, 5 is a printing paper, 6 is a printing hammer, 7 is a ribbon guide, 8 is a cartridge, 9 is a ribbon, 11 is a rubber roller, and 13 is an exit side aisle,
14 is a spring, 15 is a pressing member, 16 is a tension mechanism, 20 is a stud, 81 and 82 are cartridge side walls, 83 to 86 are cartridge bending walls, 87 is a pressing wall, and 88 is a cartridge bottom plate.

Claims (1)

[Claims for Utility Model Registration] At least four bent walls extending toward the center from both side walls of a cartridge forming a take-up roller on the inlet side and an outlet passage on the outlet side; A tension mechanism consisting of a spring and a pressing member installed between a pair of inwardly and outwardly bent walls and another pair of inwardly and outwardly bent walls extending from the other side wall are connected, and the said pressing The endless ink ribbon has a pressing wall facing the member, and the endless ink ribbon, which has been folded and loaded in a zigzag shape from the inlet side by the winding roller, is pressed against the pressing wall by the pressing member, with tension being applied to the ink ribbon. In an ink ribbon cartridge that can be pulled out, a cylindrical stud whose lower end is fixed to the bottom plate of the cartridge is placed at a position 1 to 5 mm below the width of the ink ribbon from the side wall of the cartridge, and An ink ribbon car is provided at a position approximately 10 mm corresponding to the width of the ink ribbon from the inner wall of the curved wall, and the ink ribbon is passed between the stud and the side wall of the cartridge and pulled out from the exit side passage. Tritsuji.