JPS62297174A - Preventive device against slackening of ink ribbon - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention Field of Industrial Application The present invention relates to an ink ribbon sagging prevention device used in various printing devices.

Conventional technology Conventionally, this type of ink ribbon sagging prevention device has been equipped with a one-way clutch or the like as a reversal prevention mechanism on the printing device side, and furthermore, the user can rotate the winding side in one direction each time. It had been resolved.

A conventional example will be described below with reference to the drawings.

3 to 6 show an ink ribbon winding mechanism using a rack, and the ribbon winding operation is performed only during unidirectional printing. 3 to 6, reference numeral 1 denotes a winding core in an ink ribbon cassette, which is winding up an ink ribbon 4 used between a recording paper 2 and a print head 3. The center 11L of the winding core 1 is fitted with a spool 6 disposed on a carriage of a printing device, and the spool 5 is connected to a spool gear 6. The spool gear 6 is arranged on a lever 7 having the same center of rotation and meshes with a drive gear 8a located on the lever 7 and having another center of rotation. A drive gear 88 and a drive gear 8b having a constant reduction ratio mesh with a rack 9 provided in the printing device.

In the ribbon winding mechanism with the above configuration, as the carriage moves in the direction of the arrow 10, the rack 9 and the drive gear 8a
, 8b, the driving force is transmitted, and the driving gears 8a, sb rotate in the direction of the arrow 11 1. Similarly, the spool gear 6, ie, the winding core 1, is rotated in the direction of the arrow 12, and the ink ribbon 4 can be wound up. In addition, the third
4, reference numeral 13 indicates a reverse rotation prevention spring, and its operation will be explained with reference to FIGS. 5 and 6. FIG. 5 and FIG. 6 are state diagrams in which the ribbon winding nine-lock mechanism is released.

The ribbon winding operation begins in the following steps. First, when the protrusion 7a provided on the lever 7 receives a force in the direction of the arrow 14 from a cam, a solenoid, etc. (not shown), the lever 7 rotates in the direction of the arrow 16 with the center of rotation being concentric with the spool 6. At this time, the reverse rotation prevention spring 13
Because it engages with b and suppresses this rotational movement,
Since the spool gear 6, that is, the winding core 1 reverses in the direction of the arrow 16, the ink ribbon 4 becomes slack as shown in the figure. Also, when attaching the ink ribbon cassette containing the winding core 1 to the printer, the center 1 of the winding core 1
A similar slack was caused by the clearance between the winding core 1 and the spool 5, and the amount of slack increased as the diameter of the winding core 1 became larger.

Problems to be Solved by the Invention In such a conventional configuration, the above-mentioned slack in the ink ribbon 4 inevitably occurs, and due to this slack, when the printing operation starts, the ink ribbon 4 initially In some cases, the used ink ribbon 4 is not wound up by a predetermined amount and is used again, which causes print quality problems such as blurring and staining of the print. In order to prevent this, the user can take measures such as forcibly rotating the take-up side in one direction each time, or reducing the amount of winding of the ink ribbon 4 to prevent the diameter of the take-up side from increasing. measures were taken, but none of them were essential countermeasures.

The present invention is intended to solve these problems, and is aimed at preventing the ink ribbon from sagging.

Means for Solving the Problem In order to solve this problem, the present invention provides an ink ribbon cassette with a casing machined in the center of the dogleg shape between the guide roller on the winding side and the winding core. A pendulum-shaped hinge with a fulcrum that fits into the receiving part and cylindrical guide pins at both ends is attached to a tension hinge with one end fixed to the α body side, and the above-mentioned hinge moves according to the slack of the ink ribbon due to the spring force. The ink ribbon is configured to always maintain tension by rotating around a fulcrum.

Effect: With this configuration, the ink ribbon is always kept under tension and does not become sagging.

Example Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 and 2 illustrate the operation of an embodiment of the present invention. In FIG. 1, 17 is an ink ribbon cassette housing, which includes a winding core 18°, a supply core 199, a winding side guide roller 20. A supply side guide roller 21 is arranged. Ink ribbon 2 supplied from supply core 19
2 passes between the guide wall 17IL provided on the body 17 and the back tension applying mechanism 23, and reaches the winding-side guide roller 2o. Next, the ink ribbon 22 is attached to the body 17.
It reaches the winding-side core 18 through a pendulum-shaped hinge 24 that has a fulcrum 24a that fits into a receiving portion provided in the holder and has cylindrical guide pins 24b at both ends.

The hinge 24 has one end connected to a groove 17b provided in the housing 17.

The other end is attached to the hinge 24 by a tension spring 25, and when the ink ribbon 22 sag as shown by the dotted line, the hinge 24 is moved by the restoring force of the tension spring 25 as shown in FIG. It rotates counterclockwise, creating constant tension.

Effects of the Invention As described above, according to the present invention, the following excellent effects can be obtained.

(1) It can be applied to all models because the ink ribbon slack can be fixed without changing the printing device.

(2) It can be implemented on the same day because it can be implemented by simply adding two parts to the ink ribbon cassette.

(3) Since it is possible to overcome the problems of print quality such as fading and staining, the amount of ink covered can be increased, and the product value is improved.

(4) Since a small tensile force is always applied to the winding side of the ink ribbon, it also contributes to the stability of tape running.

[Brief explanation of the drawing]

1 and 2 are schematic configuration diagrams illustrating the operation of an embodiment of the ink ribbon sagging prevention device of the present invention, and FIG.
4 is a front view of the ribbon winding mechanism using a rack, FIG. 5 is a side view of the ribbon winding mechanism in a released state, and FIG. 6 is a front view of the ribbon winding mechanism. 17... Ink ribbon cassette housing, 17a.
...... Guide wall, 18... Winding core, 19... Supply core, 2o... Winding side guide roller, 21... ...Supply side guide roller, 22... Ink ribbon, 23...
Back tension addition mechanism, 24...hinge,
242L...Fully point, 24b...Cylindrical guide pin, 25...Tension spring. Name of agent: Patent attorney Toshio Nakao and 1 other person 1st
Figure 3 Figure 4

Claims (1)

[Claims] Built-in ink ribbon supply core and take-up core inside the housing.
After passing through the back tension applying mechanism and guide roller on the supply side, passing through the contact part with the print head of the printing device, passing through the guide roller on the winding side and reaching the core on the winding side. There is a fulcrum in the center of the dogleg shape between the side guide roller and the winding core that fits into a receiving part machined inside the housing, and one end is attached to a pendulum-shaped hinge with cylindrical guide pins at both ends. An ink ribbon sagging prevention device that includes a tension spring firmly attached to the housing and a guide pin of this hinge that slides into contact with the ink ribbon.