DE2366192C2 - Ribbon guide arm on a ribbon cartridge - Google Patents

Description

The invention relates to a Farbb Tid guide arm on a ribbon cassette, the arm having a V-shaped end at which the direction of the The ribbon is reversed by 180 °.

Such a ribbon guide arm is known from US Pat. No. 3,643,779. With this guide arm are in the middle part of the arm, where the ribbon emerges from the ribbon cassette, no guide means intended. Rather, the ribbon runs practically freely over the surface of the guide arm, whereby the There is a possibility that it moves perpendicular to the feed direction or to the return direction or sags and warps, affecting ribbon movement and causing damage may occur. Since the ribbon is practically exposed in this part of the ribbon guide arm, there is also a risk that the ribbon will be damaged by environmental factors.

The object of the invention is to create an ink ribbon guide arm of the type mentioned at the beginning a movement of the ribbon perpendicular to the feed or return direction and thus a sagging and Raising the ribbon is prevented. This task is characterized by the characteristics of the Part of claim I solved.

In addition to the advantage achieved by solving the problem, which unlocks an obstruction of the ink ribbon, the solution according to the invention also protects the ribbon against environmental influences, thereby avoiding damage.

An embodiment of the invention is shown in the drawing and described below. It shows

F i g. 1 is a partial perspective view of a typewriter having an ink ribbon cartridge with a Ribbon guide arm;

Fig. 2 is a rear perspective view of the ribbon guide arm;

F i g. 3 is a perspective front view of the ribbon guide arm; with the ribbon shields removed, and

Figure 4 is an exploded perspective Representation of the ribbon guide arm,

The in F i g. 1 illustrated ribbon guide arm 10 extends laterally from a ribbon cassette 12 which can be inserted into a typewriter 14. The ribbon guide arm 10 has an opening 22 which is aligned behind a type guide 24,

is around a portion of the ribbon 26 of one type suspend. During a stop operation, the lifting mechanism 20 lifts the ribbon guide arm 10 and with it the. Ribbon 26 to a point near the writing point of the typewriter, where a type on the ribbon 26 strikes

The ribbon guide arm 10 has an elongated main portion 38 with longitudinally extending flanges 40 and 42. A partition 44 is disposed between and parallel to the flanges 40 and 42. The partition 44 is shorter than the immediately opposite portions of the flanges 40 and 4Z The flanges 40 and 42 and the partition wall 44 thus form a flow channel 44b and a return channel 44a for the movement of the ink ribbon 26. An opening 46

JO enables the ink ribbon 26 to pass onto the rear of the ink ribbon guide arm 10.

The back of the ribbon guide arm 10 is provided with flanges 48 and 50 and a partition 52 Mistake. In addition, a guide and holding finger 54 is provided. The flanges 48 and 50, the partition 52 and guide finger 54 guide the ink ribbon to and from the writing point opening 22.

A cover plate 58 (Figure 4) is provided to the To shield the ribbon 26 along the support arm 10 and to hold it in the channels 44a and 44b. the Cover plate 58 has an opening 60 and partition 44 has a hook-like finger 62. In addition, a shoulder or a stop 64 on the ribbon guide arm 10 of the opening of the hook-like

Arranged facing toward your finger 62. In this way the cover plate 58 is attached to the ribbon guide arm 10 by sliding it over the hook-like finger 62 is set so that it extends through opening 60; the cover plate 58 is to the right pushed until its end snaps into place behind the stop 64, which prevents unintentional removal of the Cover plate 58 prevents.

The finger 54 helps to hold the upper portion of the ribbon 26 against movement perpendicular to the plane of the ribbon guide arm 10 and against movement transverse to ribbon movement to ensure uniform typeface without smudging.
Since the shields can easily be placed on the ribbon guide arm after threading the ribbon, they do not interfere with threading.

Appropriately, all parts of the ribbon guide arm 10 are made of plastic. In addition, the Cover plate 58 are made transparent in order to make the ribbon visible so that markings, for example the end of the ribbon that can be seen on the ribbon.

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Claims (5)

Patent claims: 1. Ribbon guide arm απ a ribbon cassette, the arm having a V-shaped end at which the direction of the ribbon is reversed by 180 °, characterized in that the ribbon guide arm in the middle part has a ribbon channel (44a, 44b ) has that a hook-shaped finger (62) divides the ribbon channel into a flow channel (44b) and a return channel (44a ^ parallel to it), and that the finger (62) engages in the opening (60) of a cover plate (58), which the Ribbon channel with clearance for the ribbon (26) covers 2. Ribbon guide arm according to claim ί, characterized in that the flow channel (44b) is separated by a partition (44) from the return channel (44a ^. 3. Ribbon cassette according to claim 1 or 2, characterized in that the ribbon guide arm (16) a stop (64) for the end of the cover plate (58) on the open side of the hook-like finger (62) is provided 4. Ribbon cassette according to claim 2 or 3, characterized in that the hook-like Finger (62) sits on the partition (44) 5. Ribbon cassette according to one of the preceding claims, characterized in that the Cover plate (58) consists of a transparent material.