DE3009505C2 - Ribbon cassette for typewriters or office machines - Google Patents

Description

a) the supply and take-up reels (5, 9, 13) are _{slidably mounted in slots (12) of the housing (I 1} 8),

b) the feed and take-up reels (5, 9, 13) are assigned deflection rollers (3, 4),

c) compression springs (6) are provided, which soft the supply and take-up reels (5, 9, 13) press outwards along the guide slots (12),

d) at least the supply reel (5, 9, 13) is a spring (7) which determines the belt tension assigned

2. Ribbon cassette according to claim 1, characterized in that the feed and the Take-up reel (S, 9,13) have a hub (5) which is provided with guide pins (13) which can be slid in the contactors (12) and that the hub (5) surrounds a rotatably mounted winding core (9)

3. Ribbon cassette according to one of claims 1 or 2, characterized in that at least the deflection roller assigned to the supply reel (S, 9, 13) (3) from a cylinder resting with the inner jacket surface on a bearing pin (16) consists.

4. Ribbon cassette according to one of claims 1 to 3, characterized in that the compression springs (6) from a single spring clip clamped between the supply reel and the take-up reel (5, 9, 13) exist.

5. Ribbon cassette according to one of claims 1 to 4, characterized in that at least the Take-up reel (5, 9, 13) a winding core (9) driving through a cassette gap (19) of externally accessible feed wheel (2) is assigned.

50

The invention relates to a ribbon cassette for typewriters or office machines with a ribbon receiving housing, with a feed spool and one slidable in a slot of the housing stored take-up reel for the ribbon.

Ribbon cassettes of the type mentioned are generally known. So is in DE-OS 28 20 266 a Inking and correction tape guide for typewriters described, which has a supply reel and a Contains take-up reel, the supply reel having an axis of rotation that cannot be changed in its position, the take-up reel on the other hand has an axis of rotation which can be displaced along guide slots.

It is also known from DE-OS 25 53 329 a ribbon cassette in which a roll in a The rocker belonging to the container is mounted, which allows the winding to be displaced on a circular path enables.

Furthermore ir. DE-GM 78 16 716 a ribbon cassette described, in which the supply or take-up reels are each assigned a deflection roller

The known ribbon cassettes, however, require a lot of space within the printing device and are also elaborately built

The object of the invention is to provide a simple, compact ribbon cassette for typewriters or office machines to provide with small external dimensions, in which the supply and winding reel are guided in this way are that a maximum tape supply can be accommodated with minimal space requirements.

This task is performed in a ribbon cassette of the type mentioned in accordance with the characterizing feature Part of the first claim solved

The displaceability of both the supply reel and the take-up reel in connection with the Umikrollen enables a narrow construction of the cassette container. The tape tension on the cassette remains almost constant during the entire rewinding process

In a particularly advantageous embodiment According to the invention, at least the deflection roller assigned to the supply reel consists of one with the inner circumferential surface of a cylinder resting on a bearing pin.

This design of the Umlc.nkrolle is at a shift of the tape while the reel is stationary, the tape is still held taut.

Embodiments of the invention are illustrated in the drawings and will be described below for example described in more detail.

Show it

Fig. 1 is a plan view of the ribbon cassette according to the invention with the lid open,

F i g. 2 is a side view of the ribbon cassette;

3 shows a sectional view of the ribbon cassette area denoted by AB in FIG. 1 and FIG

F i g. 4 is a schematic representation of the by the Deflection pulley possible length differences.

The in the F i g. 1 and 2 illustrated ribbon cassette for interchangeable use in a typewriter consists of a housing with a lower part 1 and a cover 8 made of plastic injection molding and contains a supply reel and a take-up reel. Both the supply reel and the take-up reel consist of a hub 5 provided with guide pins 13 and a winding core 9, the guide pins 13 in guide slots 12 of the housing, and although both the lower part 1 and the cover 8 are performed.

From a supply reel 10, which with the guide pins 13 in the guide slots 12 of the Lower part 1 and the cover 8 is mounted on both sides, the belt 11 is around a deflection roller 3 14 and 15 and guided over a pulley 4 onto a winding core 9 of the take-up reel. The take-up reel a feed wheel is assigned, which is accessible from the outside through a gap 19 in the housing. The torque transmission from the feed wheel to the take-up reel or the winding core of the The take-up reel is made by frictional engagement. Of course, there is also a friction connection instead of a friction connection Interlocking possible.

A compression spring 6 consisting of a spring clip generates the necessary contact pressure between the Winding cores 9 of the supply as well as the take-up reel and the deflection roller 3 and the feed wheel 2.

The belt tension and thus the braking torque on the supply reel 10 can be controlled by a tension spring 7, which acts on the hub of the supply reel can be influenced.

As both the supply and take-up spools are slidably gelagart in the ribbon cassette, is a particularly compact design of the Housing possible. At the same time you can use the guide slots 12 the rewind condition of the ribbon cassette can be determined.

The deflection roller 3 consists of a cylinder, the inner surface of which rests against a bearing pin 16 Together with the displaceable supply reel 10, the one loosely mounted on the bearing pin 16 acts Deflection roller 3 as a resilient element to keep the belt taut. Is used according to the representation of the F i g. 4, the tape 11 is transported by a length 17 without the supply reel rotating, so the moves Center axis of the pulley 3 on an arc around the bearing pin 16 and thus moves the Feed roll 10 by a distance 18. If the tape is then by a maximum of the same length 17 moved back, the compression spring 6 pushes the supply reel 10 and the deflection roller 3 back and thus the belt 11 remains taut.

It is of course also possible in a simplified embodiment of the ribbon cassette instead the movable pulley 3 is a firmly mounted

ίο to use pulley. It is also possible instead of the continuous compression spring 6, both the supply and take-up reels have their own Assign the compression spring, which is supported on the housing.

If the ink ribbon is to be transported in two directions with an ink ribbon cassette designed in this way can, this can be achieved in that, as shown in FIG. 1 the feed wheel 2 with the associated reel spool is also arranged in mirror image on the left side of the cassette.

For this purpose 2 sheets of drawings

Claims (1)

Claims. 1. Ink ribbon cassette for typewriters or office machines with a housing receiving the ribbon, with a supply reel and an in a slot in the housing slidably mounted take-up reel for the ink ribbon, characterized by combining the following features: