JPH05254231A - Printer with ink ribbon device - Google Patents

Abstract

PURPOSE: To improve the use efficiency of an ink ribbon of a printer capable of advancing a record carrier before a platen by deriving the driving power for elements which cause an up-and-down motion from a driving gear row of a record-carrier feeding wheel. CONSTITUTION: An ink ribbon 2 is made movable up and down between a printer head 3 and a platen 4, and an ink ribbon cassette 5 is supported rotatable around the axis 6 which is located on the opposite of the platen 4 and runs in parallel with the platen 4. The ink ribbon cassette 5 is provided with a single-color ribbon which has a width corresponding to several times the height of the gap of vertical typing elements, and the ink ribbon cassette 5 is connected between the axis 6 and platen 4 driving-technically with the elements which cause an up-and-down movement of enable the forward feeding of a record carrier 10 on the platen 4. The driving power for the elements which cause the up-and-down movement is derived from a driving gear row 11 of a record-carrier feeding wheel 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer having an ink ribbon device.

[0002]

2. Description of the Prior Art It is known to support an ink ribbon cassette by means of a ribbon holder which, on the one hand, forms a rotary bearing and, on the other hand, can be moved up and down on a track by means of rolls (German Patent Application DE 3607999). ).

Due to the relationship between the moving distance of the carriage carrying the ribbon holder, the moving distance of the ribbon, and the shape of the line, the ribbon guide moves up and down so that the ribbon is used over the entire width. Whether or not the ribbon is used over the entire width depends on the number of operations, that is, the number of ribbons to be used after being ejected from the ribbon cassette through an outlet and then used again through the inlet into the ribbon cassette (circulation motion). Dependent.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to balance the movement distance of the carriage and the movement distance of the ribbon in order to achieve both the exhaustion of the ink ribbon while maintaining the quality and the simplification of the ribbon device. To make the relationship independent of the use of ribbons.

[0005]

The above problem is solved by the features described in the characterizing portion of claim 1.

An advantage of the invention is that already in very small record carrier movements the ribbon can likewise be lifted or lowered by a small amount. In this case, the amount of lifting and / or lowering can be adjusted by the design of the cam and / or by the conversion ratio of the record carrier advancing device to the driving device of the cam.

This effect is particularly remarkable when only a short line length (partial length) is printed. The only additional equipment parts are simple transmission connection parts. This principle is applicable to any type of printer that works with ribbons.

One advantageous embodiment of the invention is described in claim 2. In this case, the drive device for the element that causes the vertical movement consists of a transmission gear train, the first driven gear of the transmission gear train being directly connected to the gear or the motor pinion which is drivingly connected to the motor pinion. Mesh with each other.

In principle, any transmission is suitable for lifting or lowering, as long as the connection between the cam and the record carrier advance motor can be made. In each case, a paper advance such as 1/360 ″, which is adjusted in each case, is used.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENT In FIG. 1, a printer 1 is shown with its two side walls. The ink ribbon 2 is rotatably fed between these two side walls. The printer head 3 can be moved in front of the platen 4 between these side walls, and the printer head 3 can reciprocate between the entrance and the exit of the ribbon cassette 5, one line each time the reciprocating motion is performed. Is printed completely.

The ink ribbon cassette 5 is rotatable up and down around a shaft 6 located on the opposite side of the platen 4, which allows the width 7 of the ribbon 2 to be fully utilized.

In this case, the height 8 of the printing element group is the value of the partial width of the width 7 so that the entire height 8 of the printing element group is used by the printing element when the ribbon 2 is moved. To
Often (as in the case of table printing, for example), only one subregion of one line is printed on a page, although it is shown in the region of FIG. 4 (indicated by the circle enclosed by the dashed line). It is possible to obtain the same usage.

The ink ribbon cassette 5 comprises, for example, at least one cam 9 by means of an element 9a which produces a vertical movement.
It is supported by. The cam 9 is rotatably supported in the above-mentioned side wall of the printer 1 so that when the cam 9 is rotated, the ribbon 9 is rotated.
The ribbon 2 is moved up and down by the width of.

A record carrier 10 consisting of continuous paper or terminals is guided between the platen 4 and the printing elements of the printer head 3, and a drive gear train 11 is arranged on the shaft of the cam 9 outside the side wall of the printer 1. Has been done. The drive gear train 11 connects the record carrier advance device 12 and the cam 9.

Starting from the record carrier feed motor 12a, a transmission gear train 13 having a first driven gear 13a is guided and guided to the cam 9 via another gear 12b.
Therefore, a record carrier advance motor 12a having a record carrier advance device 12 which is always provided and is formed by a gear different from the motor pinion 14 comprises a first driven gear 13a and another gear 13 coaxial with the gear 15. It is arranged to be driven via one transmission gear train 13. Therefore, when the record carrier advance motor 12a rotates, the cam 9 also rotates, and as a result, the ink ribbon cassette 5 moves up and down as shown by the arrow in FIG.

[Brief description of drawings]

FIG. 1 is a top view of a printer including a ribbon cassette.

FIG. 2 is a partial rear view of the printer.

FIG. 3 is a side view of a printer having a ribbon cassette and a record carrier advance device.

FIG. 4 is a partially enlarged view of a ribbon.

[Explanation of symbols]

 1 Printer 2 Ink Ribbon 3 Printer Head 4 Platen 5 Ink Ribbon Cassette 6 Axis 7 Ribbon Width 8 Height of Printing Element Group 9 Cam 9a Element for Up and Down Movement 10 Recording Carrier 11 Drive Gear Train 12 Recording Carrier Forwarding Device 12a Forward feed motor 12b Gear 13 Transmission gear train 14 Electric motor pinion 15 Gear

Claims (2)

[Claims] 1. An ink ribbon is movable up and down between a printer head and a platen, and an ink ribbon cassette is rotatably supported around an axis on the side opposite to the platen and running parallel to the platen. The ink ribbon cassette has a monochromatic ribbon having a width (7) corresponding to several times the height of the vertical printing element gap, and the ink ribbon cassette between the shaft and the platen drives the element that causes vertical movement. In a printer having an ink ribbon device which is connected in series and in which the record carrier can be advanced on the platen, the driving force for the element (9a) causing the vertical movement is the record carrier advance device ( A printer having an ink ribbon device, which is derived from the drive gear train (11) of 12). 2. The drive for the element (9a) that causes the vertical movement comprises a transmission gear train (13), the first driven gear (13a) of the transmission gear train (13) being a motor pinion (14). 2. A printer with an ink ribbon device according to claim 1, characterized in that it meshes directly in a gear wheel which is drivingly connected to it or in a motor pinion (14).