JPS61106289A - Ribbon roller - Google Patents

Abstract

PURPOSE:To prevent a ribbon from jamming and prevent a roller part from being broken, by a construction wherein the surface of one of a pair of opposed ribbon rollers for feeding a printing ribbon into a ribbon cartridge is provided with spiral projected parts extending from a substantially central part in the axial direction toward both ends. CONSTITUTION:The ribbon 5 is clamped between outer peripheries of the projected parts 7 provided on the surface of the ribbon roller 3 and a cylindrical surface of a ribbon roller 4, which are pressed against each other with an appropriate pressure. The projected parts 7 are slanted toward both ends of the ribbon roller 3, whereby the ribbon 5 is stretched outward in the width direction thereof. The projected parts 7 is provided in a spiral form extending from a substantially central part in the axial direction of the surface of the roller 3 toward the both ends, so that when the rollers 3, 4 are rotated in the state of being pressed against each other, the ribbon 5 is stretched outward in the width direction. Accordingly, even where the fabric of the ribbon 5 is weakened to tend to be folded along the feeding line thereof, the ribbon can be prevented from jamming, since the force for stretching the ribbon 5 outward in the width direction is constantly exerted on the ribbon.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to the shape of a ribbon roller that feeds a ribbon for printing into a ribbon cartridge of a printer.

[Technical background of the invention and its problems] The conventional ribbon feeding roller has a shaft 1, as shown in FIGS. 5 and 6 as a front view and a plan view, respectively.
, 2, the ribbon 5 is pressed and held between at least one pair of ribbon rollers 3, 4 rotatably supported by the shafts 1.2, and at least one of them is driven within the shaft 1.2. 5 into a ribbon cartridge (not shown).

According to the conventional ribbon roller as described above, printing on the ribbon weakens the fabric, making it easy for creases to form in the running direction of the ribbon from that part, and the occurrence of these creases causes the ribbon to wrap around the ribbon roller and cause the ribbon to become weak. There is a problem that a so-called ribbon jam occurs when the ribbon is crushed, or the ribbon jams after it enters the cartridge, resulting in poor printing.

[Object of the Invention] The present invention has been made in view of the above-mentioned points, and it is possible to prevent ribbon cross-slip caused by weakening of the ribbon fabric,
To provide a ribbon roller capable of extending the service life of a ribbon cassette, preventing occurrence of ribbon jam, and preventing damage to a roller part.

[Summary of the Invention] The present invention provides a method for feeding a printing ribbon of a printer into a ribbon cartridge. A protrusion is formed in a spiral shape.

According to the ribbon roller having the above-mentioned shape, it is possible to prevent the ribbon from bending sideways, thereby extending the life of the ribbon cassette, preventing ribbon jamming, and preventing damage to the roller portion.

[Embodiment of the Invention] Hereinafter, an embodiment of the ribbon roller according to the present invention will be described with reference to the drawings.

1, 2, and 3 show an embodiment of the present invention as a front view, a plan view, and a perspective view, respectively. In these figures, the same or equivalent parts as the conventional example shown in FIGS. 5 and 6 are Indicated by the same code. A pair of ribbon rollers 3 and 4 made of a soft surface material such as rubber are supported by shafts 1 and 2, respectively, and are arranged facing each other.
As in the conventional example, the ribbon 5 is held between the shafts 1 and 4 under appropriate pressure, and the ribbon 5 is fed into the ribbon cartridge 6 by driving one of the shafts 1 and 2. It is. On the surface of one of the ribbon rollers 3 and 4, for example 3, there is a book i! The protrusions 7, which are a distinctive feature of the present invention, are formed in a spiral shape from approximately the center in the axial direction of the ribbon roller 3 in the vertical direction in the figure.

The cross-sectional shape of this protrusion 7 is as shown in FIG.
The ribbon roller 3 has a substantially parallelogram shape that is tilted toward the upper and lower ends.

The operation of one embodiment of the present invention formed as described above will be described below. The ribbon 5 is held between the outer periphery of a protrusion 7 formed on the surface of the ribbon roller 3 and the cylindrical surface of the ribbon row 54, and are pressed against each other with appropriate pressure. At this time, the projections 7 fall down toward both ends of the ribbon roller 3, as shown in FIG. 4(b), and act to stretch the ribbon 5 outward in the width direction. Furthermore, since the protrusion 7 is formed in a spiral shape from approximately the center of the surface of the ribbon roller 3 in the axial direction toward both ends, when the ribbon rollers 3 and 4 rotate while being pressed against each other, the ribbon 5 is similarly moved in the width direction. This action stretches the ribbon 5 outward.
Even if the fabric is weakened by printing and creases occur easily along the flow direction of the ribbon 5, there is always a force that stretches the ribbon 5 outward in the width direction, so the ribbon 5 It is possible to prevent the ribbon from being crushed and wrapped between the ribbon rollers 3.4, resulting in a so-called ribbon jam. Similarly, ribbon 5 is ribbon cartridge 6.
It is also possible to prevent ribbon jams from occurring even after entering the interior. Therefore, damage to the roller portion due to ribbon jam can be prevented, and the machine can be protected.

In this embodiment, the case where a ribbon cartridge is used has been described, but the same effect can be obtained by winding the ribbon on a reel.

[Effects of the Invention] According to the present invention, on the surface of one of a pair of ribbon rollers for feeding the printing ribbon of a printer into a ribbon cartridge, a protrusion spirally extends from approximately the center in the axial direction of the ribbon roller toward both ends. This structure prevents the ribbon from bending sideways, prolonging the life of the ribbon, and preventing damage to the roller portion due to ribbon jam.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the ribbon roller according to the present invention, FIG. N2 is a plan view of FIG. 1, FIG. 3 is a perspective view showing the main part of FIG. ). (b) is a sectional view showing the convex portion of FIG. 1, FIG. 5 is a front view showing a conventional ribbon roller, and FIG. 6 is a plan view of FIG. 5. 1.2...Shaft 3,4...Ribbon roller 5
... Ribbon 6...- Ripon cartridge 7...
Convex Agent Patent Attorney Ken Ken Chika (1 person) Figure 1 Figure 2

Claims (3)

[Claims] (1) In a pair of opposing ribbon rollers that feed the printer's printing ribbon into the ribbon cartridge,
A ribbon roller characterized in that a protrusion is formed on the surface of one of the pair of ribbon rollers in a spiral shape from approximately the center in the axial direction of the ribbon roller toward both ends. (2) The ribbon roller according to claim 1, wherein the ribbon roller is made of a soft material. (3) The ribbon roller according to claim 1 or 2, wherein the protrusion is formed in a shape that collapses in one direction due to pressure from the opposing ribbon roller.