JPH0624108A - Ink ribbon - Google Patents

Abstract

PURPOSE:To adjust the ink feed amount for adjusting the print density by turning an eccentric spindle capable of varying the contact pressure of a wick of an ink ribbon to a transfer gear. CONSTITUTION:An eccentric spindle 8 capable of varying the contact pressure of a wick 2 to a transfer gear 3 is provided and turned to vary the contact pressure, so that the ink feed amount is adjusted and the print density can be controlled. Therefore, a user can adjust the print density by turning the eccentric spindle 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reink ribbon used in a printing device such as an impact dot matrix printer, and the ink supply amount is changed by changing the contact pressure of the reink ribbon to the transfer member of the wick. The present invention relates to a reink ribbon capable of adjusting print density.

[0002]

2. Description of the Related Art A plan view of a conventional reink ribbon with an upper case removed is shown in FIG. One end of the wick 2 is in contact with the occlusion body 1 impregnated with ink. The other end of the wick 2 is in contact with a transfer gear 3, which is a transfer member, and this contact is obtained by flexing the wick 2 a little and obtaining contact pressure by the spring property of the wick 2 itself. The endless ribbon base fabric 4 includes a gear portion 6 of the transfer gear 3 and a gear portion 7 of the driven gear 5.
It is sandwiched between and. The transfer gear 3 engages with a driving member of a printing device (not shown) to obtain a rotational force. Next, the flow of ink will be described. The ink stored in the occlusion body 1 moves to the wick 2 by a capillary phenomenon. The ink of the wick 2 is scraped off by the gear portion 6 of the transfer gear 3 when the transfer gear 3 rotates counterclockwise in FIG. 4, and the gear portion 6 with the ink rotates to rotate the gear portion 7 of the driven gear 5.
The portion which meshes with the ribbon base fabric 4 comes into contact with the ribbon base fabric 4, and the ink is transferred from the gear portion 6 to the ribbon base fabric 4. The ink transferred to the ribbon base cloth 4 moves together with the ribbon base cloth 4 and is pressed by a head (not shown) to be transferred to the paper.
Is printed.

Next, the ink supply amount will be described. Hereinafter, the amount of ink transferred from the transfer gear 3 to the ribbon base cloth 4 is referred to as an ink supply amount. When the contact pressure between the wick 2 and the transfer gear 3 is constant, the ink supply amount from the occluding body 1 to the wick 2 is related to the residual ink amount of the occluding body 1, and to the wick 2 during initial printing with a large residual ink amount. Is large, and therefore the amount of ink supplied to the ribbon base cloth 4 is also large. In the latter half of the printing life where the residual ink amount was small, the ink supply amount to the wick 2 was small, and the ink supply amount to the ribbon base cloth 4 was also small. When the ink supply amount was small, the amount of ink transferred to the paper when printing was small and the print density was low. In addition, the ink supply amount was set to a small value so that the ink would not be over-supplied even when the print duty was low, such as when a small number of users had special uses, for example, when printing only a number of ruled line frames. .

[0004]

As described above, in the conventional structure in which the contact pressure between the wick 2 and the transfer gear 3 is constant and the ink supply amount is affected by the remaining ink amount, the print density is the latter half of the print life. It had become thin. In addition, a user who wants to print with a high print density has no choice but to use a new reink ribbon, which is expensive and wastes resources.

[0005]

A reink ribbon having a wick and a transfer member in contact with the wick has a pressure adjusting means capable of changing a contact pressure of the wick to the transfer member.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a plan view of the reink ribbon of the present invention with the upper case removed. FIG. 2 is a sectional view taken along the line AA in FIG. One end of the wick 2 is in contact with the occlusion body 1 impregnated with ink. The other end of the wick 2 is in contact with a transfer gear 3, which is a transfer member, and this contact is obtained by flexing the wick 2 a little and obtaining contact pressure by the spring property of the wick 2 itself. An eccentric shaft 8 as a pressure adjusting means is provided at a position where the wick 2 comes into contact with the spring portion of the wick 2, that is, between the contact portion of the wick 2 and the occlusion body 1 and the contact portion of the wick 2 and the transfer gear 3. . In FIG. 2, the eccentric shaft 8 has a rotating shaft portion 9 and an eccentric shaft portion 10. The lower rotary shaft portion 9a is inserted into a blind hole 16 provided in the lower case 11, the diameter of the blind hole 16 is larger than the diameter of the lower rotary shaft portion 9a, and the eccentric shaft 8 is rotatably guided. To be done. The lower case 11 is formed with the blind hole 16 in order to prevent ink from leaking from here. The upper rotary shaft portion 9b is inserted into the hole 13 of the upper case 12, and the diameter of the hole 13 is slightly smaller than the diameter of the upper rotary shaft portion 9b, and is formed by swallowing. The upper rotary shaft portion 9b is provided with a split groove 1 along the axial center line.
4 is provided up to a position below the lower surface of the upper case 12, and the amount of the interference between the hole 13 and the upper rotary shaft portion 9b is bent inward because the upper rotary shaft portion 9b has the split groove 14, and the upper rotary shaft portion 9b is bent. The portion 9b and the hole 13 are configured to be rotatable with a desired contact pressure. The eccentric shaft 8 is prevented from rotating by this contact pressure. That is, the eccentric shaft 8 receives a spring force from the wick 2 when it is rotated, but this eccentric shaft 8 does not rotate. Further, the split groove 14 can also be used as a groove into which a claw, a coin or the like is inserted and rotated when the eccentric shaft 8 is rotated. The endless ribbon base fabric 4 is sandwiched between the transfer gear 3 and the driven gear 5. Although not shown, the transfer gear 3 engages with a driving member of the printing device to obtain a rotational force. Next, the flow of ink will be described. The ink stored in the occlusion body 1 moves to the wick 2 by a capillary phenomenon. The ink of the wick 2 is transferred when the transfer gear 3 rotates counterclockwise in FIG.
Gear part 6 rubbed off with ink and attached with ink
Rotates and comes into contact with the ribbon base cloth 4 at a portion of the driven gear 5 that meshes with the gear base section 7, where the ink is transferred from the gear section 6 to the ribbon base cloth 4. The ink transferred to the ribbon base cloth 4 moves together with the ribbon base cloth 4 and is pressed by a head (not shown) to be transferred and printed on a sheet (not shown). Next, the operation of changing the ink supply amount will be described. When the eccentric shaft 8 is rotated, the wick 2 which is in contact with the eccentric shaft portion 10 is moved to the left side in FIG. 2 by the eccentric amount determined by the eccentric amounts of the rotating shaft portions 9 and 10 and the rotation angle of the eccentric shaft 8. It The amount of deflection of the wick 2 due to the transfer gear 3 increases due to the movement of the wick 2, so that the contact pressure between the wick 2 and the transfer gear 3 increases. FIG. 3 is a graph showing the relationship between the contact pressure between the wick 2 and the transfer gear 3 and the ink supply amount, and shows that the ink supply amount increases as the contact pressure between the wick 2 and the transfer gear 3 increases. . Therefore, when the eccentric shaft 8 is rotated to increase the contact pressure between the wick 2 and the transfer gear 3, the ink supply amount increases, and the eccentric shaft 8 can be rotationally adjusted to adjust the ink supply amount.

By rotating the eccentric shaft 8 so that the ink supply amount can be adjusted, the ribbon base cloth 4 at the time of printing can be adjusted.
It is possible to adjust the amount of ink printed on the paper from the paper, and thus the print density. When the user is using a ribbon and the print density becomes lighter in the latter half of the printing life, the user can obtain a high print density by rotating the eccentric shaft 8, and at a low cost without using a new ribbon, resource saving. It also becomes. The adjustment time is short because the eccentric shaft 8 can be rotated while the reink ribbon 15 is attached to the printing device (not shown), and a new reink ribbon can be brought in for replacement or a new one as in the conventional case. There is no need to spend time going to purchase a reink ribbon. If the user wants a darker print even during the initial print, the eccentric shaft 8 can be adjusted to obtain a print density that suits the taste.

In the present invention, the position of the eccentric shaft 8 is provided midway between the contact portion of the wick 2, the occlusion body 1 and the contact portion of the wick 2, and the transfer gear 3. However, the transfer with the wick 2, which is the other end of the wick 2, is performed. The same effect can be obtained even if it is provided at the tip of the contact portion with the gear 3. In the present invention, the eccentric shaft portion 10 of the eccentric shaft 8 is described as an example having a circular cross section, but the cross sectional shape may be an elliptical shape or an oval shape, and the same as long as it is eccentric with respect to the rotation center of the rotary shaft portion 9. Exert the effect of. Hole 13 in upper case 12
By displaying the magnitude of the ink supply amount or the density of the print density on the surface in the vicinity of, in association with the groove direction of the split groove 14 of the rotary shaft portion 9, the number of parts can be increased without complicating the parts processing. It is possible to display the ink supply amount and the print density without doing so.

[0009]

As described above, the reink ribbon of the present invention is provided with the ink supply amount by providing the eccentric shaft which is the pressure adjusting means capable of changing the contact pressure to the transfer gear which is the transfer member of the wick. Can be adjusted, and therefore, the printing density can be adjusted.

[Brief description of drawings]

FIG. 1 is a plan view of the reink ribbon of the present invention with an upper case removed.

FIG. 2 is a sectional view showing an AA section of FIG.

FIG. 3 is a graph showing the relationship between the contact pressure between the wick 2 and the transfer gear 3 and the ink supply amount in the present invention.

FIG. 4 is a plan view of the conventional reink ribbon with the upper case removed.

[Explanation of symbols]

 2 Wick 3 Transfer gear 6 Gear part 8 Eccentric shaft 9 Rotating shaft part 10 Eccentric shaft part 11 Lower case 12 Upper case 13 Hole 14 Split groove

Claims (1)

[Claims] 1. A reink ribbon having a wick and a transfer member in contact with the wick, the reink ribbon having pressure adjusting means capable of changing a contact pressure of the wick to the transfer member. .