DE2366192B1 - Ribbon guide arm on a ribbon cassette - Google Patents

Description

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

Such a ribbon guide arm is from the US-PS 36 43 779 known In this guide arm are in the middle part of the arm, where the ribbon comes from no guide means are provided for exiting the ribbon cassette. Rather, the ribbon runs practically free over the surface of the guide arm, giving the possibility that

perpendicular to the

Feed direction or to the return direction shifts or sags and thereby raises itself whereby the Ribbon movement is impaired and damage can occur. Because the ribbon in this Part of the ribbon guide arm is practically exposed, there is also the risk that the ribbon through Environmental influences is damaged.

The object of the invention is to create an ink ribbon guide arm of the type mentioned at the outset, in which a movement of the ink ribbon perpendicular to the Zuh ^ w. Jerk) Bi? Fr! ^/ * h * i? n ^cr and ^? fT> i * ? ' ⁱⁿ . Ουτ ^^ αησρη ^| * ⁿⁱ ^ upgrading of the ribbon is prevented. This object is achieved by the features of the characterizing part of claim 1

In addition to the benefit of the task solution, which excludes an obstruction of the 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 cassette with a Ribbon guide arm;

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

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

4 shows a perspective drawn together Representation of the ribbon guide arm.

ίο The in Fi g. 1 illustrated ribbon guide ana 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

5 nm a section of the ribbon 26 of one type suspend. During a stop operation, the lifting mechanism 20 lifts the ribbon guide arm 10 and thus the ribbon 26 to a location near the sliding part of the typewriter where a type juf the ribbon 26 strikes

The ribbon guide arm 10 has an elongated main part 38 with longitudinally extending flanges 40 and 42. A partition wall 44 is arranged between and parallel to the flanges 40 and 42. The partition wall 44 is shorter than the immediately opposite portions of the flanges 40 and 42 Flanges 40 and 42 and the partition 44 thus form a flow channel 44b and a return channel 44a for the movement of the ink ribbon 26. An opening 46 enables the ink ribbon 26 to pass through to 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. There is also a leading and holding finger 54 provided. The flanges 48 and 50, the partition 52 and the guide finger 54 feed the ribbon and from the writing site opening 22.

A cover plate 58 (FIG. 4) is provided to shield the ink ribbon 26 along the support arm 10 and hold it in channels 44a and 44f *. the Cover plate 58 has an opening 60 and partition 44 has a hook-like finger 62. There is also a shoulder or stop 64 on the ribbon guide arm 10 of the opening of the hook-like » Fingers 62 arranged facing them. In this way, the cover plate 58 is attached to the ribbon guide arm 10 by placing it over the hook-like finger 62 so that it can pass through the opening 60 extends; the cover plate 58 is pushed to the right until its end is behind the stop 64 e'nloset that prevents unintentional removal of the cover plate 58.

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 a driver 711 of the printer to ensure uniform typeface without smudging.

Because the shields lightly onto the ribbon guide arm after threading the ribbon can be put on, 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.

For this purpose 2 sheets of drawings

Claims (5)

Patent claims: 1. Ribbon guide on a ribbon cassette, the arm having a V-shaped end at which the direction of the color is reversed by 180 °, characterized in that the ribbon guide arm in the middle part has a ribbon channel {44a, 44h } has that a hook-shaped finger (62) divides the ribbon channel into a flow channel {44b) and a return channel (44 ^ 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 Fühningiarm according to claim i, characterized in that the flow channel {44b) is separated by a partition (44) from the return channel (44a). 3. Ribbon cassette according to claim I or 2, characterized in that the ribbon guide (10) ~ in stop (64) for the end d
Cover plate ^ 58) is provided on the open side of the hook-like finger (62) 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