JPH0342190B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The invention can be installed in a typewriter or similar office machine having accommodation spaces for ribbon supply and take-up reels, as defined in the preamble of claim 1. Regarding ribbon cassettes.

Conventional ribbon cassettes that can be mounted on a typewriter or similar office machine have a receiving space for a supply and take-up reel for ribbon, with the ribbon being spaced from the supply reel in the receiving space. It can be guided through the printing position of the machine via two guiding channels and can be wound up again onto a winding reel. The ribbon may consist of woven colored tape that is fed through the printing position many times from one reel to the other, or it may be passed through a machine so that each side portion of the ribbon can be used only once for printing. It consists of a one-way carbon tape that is fed only once. Furthermore, the ribbon can also consist of multiple carbon tapes, which are likewise fed through the machine only once, but in which one side portion is subjected to multiple printings. In woven ribbons, the size of the feed step is less important since each side of the ribbon is used multiple times. In single-way carbon ribbons, the feed step must be one symbol width, whereas in multi-layer carbon ribbons, economical use requires a ribbon drive that produces small feed steps.

Many ribbon cassettes are known that have a variety of ribbon types that prevent soiling of hands during insertion and removal of the cassette and are easily interchangeable. From DE 25 53 329 A1, a manually replaceable cassette for carbon ribbons is known. However, with this known device,
It is only possible to feed the ribbon at a constant rate, and it is not possible to drive the ribbon in various ways depending on the type of ribbon.
This known device also does not allow optimal use of the storage space for the supply reel and take-up reel. This is because the toothed roller for the take-up reel and the swing lever are arranged one after the other in the receiving space. The swing lever for the take-up reel has a saddle part which requires a large amount of space. If this known ribbon cassette is used in a typewriter with a correction device, a large stroke of the correction ribbon is required in order to move it into the printing position. With the design of the ribbon cassette according to the known DE 25 53 329 A1, a compact arrangement of the ribbon and the correction ribbon in the area in front of the printing position is not possible.

The object of the invention is that it can be constructed compactly for all types of ribbons, and that it can be easily installed and removed by hand in the storage device of the machine, without requiring any skill on the part of the person operating the machine. To provide a ribbon cassette that does not require Furthermore, in a typewriter having a correction device, a ribbon cassette is constructed in which the correction ribbon can be placed directly below the ribbon in the cassette. The travel of the correction ribbon from the inactive position to the printing position is made as small as possible. This object is solved by the invention having the features specified in the claims.

The ribbon cassette according to the invention is of very compact and material-saving construction. According to an advantageous development of the subject matter of the invention as claimed in claims 2 and 3, the correction ribbon can be arranged directly below the ribbon, so that the correction ribbon can be moved from the inactive position to the printing position. A very small stroke is obtained. The correction ribbon can therefore be moved very quickly from the inactive position to the printing position with little force and then returned again very quickly.

According to a further development of the subject matter of the invention, the guide channel has a height which is only somewhat greater than the width of the ribbon. The subject matter of claim 6 ensures that ribbon cassettes with ribbons requiring different step feeds can also be constructed compactly.

Further advantageous developments of the subject matter of the invention are indicated in the further dependent claims.

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

FIG. 1 shows a plan view of the ribbon cassette 1, and FIG. 2 shows a side view. Ribbon cassette 1
consists of a container-shaped bottom 33 and a lid 35 that can be connected thereto. The lid 35 has evenly distributed holes 36 to reduce weight and noise. The lid 35 has support pins (not shown) which can be inserted and locked into corresponding support holes in the base plate 33. The bottom part 33 of the ribbon cassette 1 has supporting hooks 8, 10 projecting at the rear wall 38, which support hooks are connected to correspondingly designed supports of the receiving plate 2 of the receiving device for ribbon cassettes of the machine. It can be inserted into the notches 40, 42. Furthermore, the bottom part 33 has locking pins 12, 14 at the side walls 44 and 46, which locking pins are supported on the receiving plate 2 for locking the ribbon cassette on this receiving plate 2. Works together with the stop lever. When attaching the ribbon cassette 1 to the receiving plate 2, the plug-in hooks 8, 10 are first inserted into the corresponding support recesses 40, 42, and then the cassette is moved towards the receiving plate 2 using the locking levers in the receiving plate 2. The support pins 12, 14 are swung until they are locked. Therefore, the ribbon cassette 1 can be attached by hand.

The container-shaped bottom 33 has a receiving space 5 for the supply reel 3 and the take-up reel 41 for the ribbon 11 . The supply reel 3 is rotatably supported 9 on the bottom surface 30 of the receiving space 5, with the ribbon 11
is guided from the supply reel 3 via deflection guides 13, 15, 17 and 19 arranged on the bottom surface 13 in the receiving space 5 into a guide channel 23 formed as a guide arm. The ribbon then passes through the printing position via a deflection guide 21 arranged in an outlet opening 69 of the guide channel 23 and via a deflection guide 25 in an inlet opening 71 of the guide channel 24, which is formed as a guide arm. You will be guided. Guide passage 2
4, the ribbon 11 passes through the turning guide section 27,
29 to the winding drive 31.
The deflection guides 27 and 29 are likewise arranged on the bottom surface 30 of the receiving space 5. Both guide passages 2
3, 24 are fixedly connected to the base 33, with the free end of the type carrier 73 being supported between these guide channels 23, 24 in such a way that it can be rotated by a stepper motor (not shown). ing. The type carrier 73 has resilient teeth, at the free ends of which the type is arranged in a known manner. Each set type character is transferred to the record carrier 7 by a printing hammer 75 driven by a magnet 77.
9, and at that time, as is well known, ribbon 1
Printing is performed with 1 in between.

According to FIGS. 3 and 4, the winding drive 31 has a toothed drive wheel 39, which
It is always caught in the outermost turn of the take-up reel 41. The take-up reel 41 is connected to the swing lever 4
5, the swing lever 45 is pivotable about an axis 49 and is biased clockwise by a spring 47 to rotate the outermost part of the take-up reel 41. The winding is always kept on the drive gear 39.

The drive wheel 39 can be connected to a drive element 61 which can be driven via a motor 59 via a transmission configured as a step width changeover device. The transmission has replaceable gear pairs 63, 65 which are selectable for step-feeding the ribbon 11 in different ways depending on the type of ribbon, and which provide a supply reel 3 and a winding in the receiving space 5. It can be inserted at any time immediately before or during the insertion of the take-up reel 41.
The transmission gear 63 is fixedly connected to the drive wheel 39 , and the other gear 65 is connectable to the drive element 62 of the machine and has a manual adjustment wheel 67 .
fixedly connected to. This manual adjustment wheel 67
can be rotated with a finger from outside the casing at the lid 35.

The supply reel 3 is fixedly connected to a toothed brake disc 81 . The outer periphery of this brake disk 81 has teeth 83, and an elastic round wire 85 fixedly stretched on one side is fitted in the teeth. The ribbon 11 coming from the supply reel 3 passes around the arm via the deflection guide 13 and is then guided as described above via the deflection guides 17, 19, 21. When the ribbon 11 is driven by the winding drive 31 in the direction 89 of the arrow, the arm 15
is lifted from the teeth 83 of the brake disc 81,
The supply reel 3 is thereby freed. ribbon 1
As soon as the tension at 1 is reduced, the elastically supported arm 15 of the round wire 85 returns again into the teeth 83 of the brake disc 81, whereby the supply reel 3 is again locked against reversal. The bottoms 26, 28 of the two guide channels 23, 24 have a height offset 16, 18 with respect to the bottom 30 of the receiving space 5, so that an extension of the bottom 30 of the receiving space 5 Under the guide passages 23, 24 there are in each case one space for the machine parts arranged in the receiving device of the ribbon cassette 1 of the machine.
Two spaces 50 , 52 are created and the ribbon 11 unwound from the supply reel 3 is guided in a closely spaced manner on the inner bottom surface 26 of the guide channel 23 having an outlet opening 69 . The mechanical parts are individual parts, for example a supply reel 56 and a take-up reel 58 for the correction ribbon 54 of the correction device. . The bottoms 26, 28 of the two guide channels 23, 24 have in each case one partially cylindrical recess 20 pointing outwards for the winding surfaces 60, 62 of the supply reel 56 and the take-up reel 58 for the correction ribbon 54. , 22. The supply reel 56 and take-up reel 58 for the correction ribbon 54 are rotatably supported, for example, on the storage plate 2, in which case the correction ribbon 54 passes from the supply reel 65 via the turning guide 64 through the printing position. In addition, it is guided to the take-up reel 58 via another turning guide section 66 . The drive of the take-up reel 58 takes place in a known manner and is not shown in detail. After attaching the ribbon cassette to the storage plate 2, the recess 20 in the bottom 33 of the ribbon cassette
The correction ribbon 54 is positioned directly below the ribbon 11 by the penetration of the winding surfaces 60, 62 of the supply reel 56 and take-up reel 58 at 22. A small stroke is thereby required to lift the correction ribbon from the inactive position to the active position. The ribbon device and the correction device form a compact device on the receiving plate 2. Flange of supply reel 3 formed as brake disc 81, take-up reel 41
a moving lever 45 designed as a holding device for
and inner bottom surfaces 26, 28 of guide passages 23, 24
A compact arrangement of the ribbon cassette 1 is provided because replaceable gears 63, 65 are movably arranged in the lower part 32 of the support space 5.

The bottom surface 26 of the guide passage 23 has a notch 91,
This cutout cooperates with a locking device, not shown, to prevent the ribbon cassette with carbon ribbon from being in the operating position. Due to the locking device cooperating with the recess 91 in the guide channel 23, only ribbons without a pigment-containing layer that adheres to the surface of the paper and can be removed therefrom again by means of the adhesive ribbon can be placed in the operating position. Guaranteed.

Furthermore, in the transition position 16 to the guide channel 23 with the outlet opening 69, the bottom surface 30 of the receiving space 5 has recesses for contact pins 68, 70, which are arranged in the receiving plate 2 of the receiving device of the machine. connected to a circuit and to an alarm device, e.g. an indicator lamp. This alarm system is used for ribbon monitoring, thereby alerting the machine operator of the proximity of the tape end to the printing point. For this purpose, the rear end of the ribbon is provided with electrically conductive means which are formed as sensing elements and can be operatively connected to contact springs 72, 74 which are formed as contact sensing elements. These contact springs 72 and 74 are supported by the inner bottom surface 30 of the storage space 5, and are connected to the storage plate 2 of the machine via cutouts 78 and 76 in the bottom surface 30.
It can fit into the contact pins 68, 70 located at The conductive means attached to the ribbon ends can be a vapor deposited metal layer. Contact spring 7
2, 74 have cylindrical tongues 80, 82 which scan the ribbon 11 and fill the receiving space 5.
It can be locked to pins 17 and 19 standing perpendicularly to the inner bottom surface 30 of. The pins 17, 19 have locking recesses 88, 90 in which locking hooks 92, 94 on the cylindrical tongues 80, 82 can be locked. When the metal layer deposited on the ribbon ends is guided through the cylindrical tongues 80, 82,
Immediately the circuit leading to the alarm device via contact pins 68, 70 is closed.

The arrangement according to the invention of the supply reel 3, the take-up reel 41 including the holding lever 45, the transmission and alarm contact springs allows a compact arrangement of the ribbon cassette 1. The receiving space 5 for the supply reel 3 and the take-up reel 41 is optimally utilized according to the invention. Furthermore, in a typewriter equipped with a correction device, this correction device can be compactly arranged together with the ribbon device.

Within the framework of the invention, it is also possible to connect the take-up reel 58 and the supply reel 56 of the correction device to the ribbon cassette 1 before insertion of the ribbon cassette 1;
As a result, the ribbon cassette 1 and the correction reel 56,
58 can be inserted into or removed from a storage device of the machine at any time.

[Brief explanation of drawings]

1 is a top view of a ribbon cassette according to the invention, FIG. 2 is a side view of FIG. 1, FIG. 3 is a top view of the cassette according to the invention with the lid removed, FIGS. The figure shows a detail of FIG. 3. 1... Ribbon cassette, 3... Supply reel, 5
...accommodation space, 11...ribbon, 16,18...
Height offset portion, 23, 24...Guidance passage, 4
1... Winding reel, 50, 52... Space, 54
...correction tape.

Claims (1)

[Claims] 1. A storage space is provided for a supply reel and a take-up reel of the ribbon, the ribbon being guided from the supply reel via two guide channels arranged at a distance from each other in the storage space. In a ribbon cassette attachable to a typewriter or similar office machine, which can be guided through the printing position of the machine and wound up again onto a take-up reel, the bottoms 26, 28 of the two guide passages 23, 24 have a height offset 16, 18 with respect to the bottom 30 of the receiving space 5, so that in the extension of the bottom 30 of the receiving space 5, below the guide channels 23, 24, the drive part of the correction device, for example, can be placed. A ribbon cassette which can be mounted on a typewriter or similar office machine, characterized in that a space 50, 52 is created in each case for accommodating the ribbon cassette. 2. A cassette according to claim 1, wherein the drives are a supply reel 56 and a take-up reel 58 for a correction ribbon 54 of a correction device. 3 Bottoms 26, 28 of both guide passages 23, 24
is the winding face 6 of the supply reel 56 and take-up reel 58 for the correction ribbon 54 in the storage device of the machine.
3. A cassette according to claim 2, having an outwardly directed, partially cylindrical recess 20, 22 for a diameter of 0.0, 62. 4 A holding device 45 is movably mounted in the accommodation space 5 and is attached to the take-up reel 41 of the cassette.
A drive toothed roller 39 is mounted in the receiving space 5 with its rotating shaft fixed relative to the cassette, and a spring 47 supports the holding device 45.
is connected to the take-up reel 41.
The outermost turn of the ribbon 11 wound on the cassette is pressed in the direction of engagement onto the drive toothed roller 39, and the supply reel 3 of the cassette has a hub and a flange 81 attached to the hub, and the flange 81 and the retaining A device 45 is arranged in a section 32 of the reel receiving space 5, which section is connected to the guide channels 23, 2.
4. The cassette according to claim 1, 2 or 3, wherein the bottom surfaces 26, 28 of the cassette 4 are lower than the bottom surfaces 26, 28 of the cassette 4. 5 A drive toothed roller 39 is attached to a transmission, which is arranged in the lowered part 32 of the receiving space 5 and has an exchangeable gear pair 63, 65, which Gear pairs are selectable for step-feeding the ribbon 11 in different ways depending on the type of ribbon, and can be inserted at any time immediately before or during the insertion of the supply reel 3 and the take-up reel 41 into the receiving space 5. A cassette according to claim 4. 6. The transmission consists of a pair of gears 63, 65, one gear 63 being connectable to the drive wheel 39 and the other gear 65 to the drive element 61 of the machine;
and fixedly coupled to the manual adjustment wheel 67;
A cassette according to claim 5. 7. A contact detection part is provided at the rear end of the ribbon, and the ribbon 11 is provided with a conductive means, such as a vapor-deposited metal layer, as a detectable means.
Furthermore, the contact detection parts are contact springs 72, 74, which spring contacts are supported on the inner bottom surface 30 of the receiving space 5 at the transition position 16 to the guide channel 23 with the outlet opening 69, and this bottom surface 30
7. The cassette according to claim 1, wherein the cassette can be inserted into contact pins 68, 70 of an alarm device in a machine storage device through the recesses 76, 78 of the cassette. 8 Contact springs 82, 74 are connected to cylindrical tongues 80, 8
2, these tongues scan the ribbon 11,
and the pin 1 perpendicular to the inner bottom surface 30 of the accommodation space 5
7, 19, Claim No. 7
The cassette described in section. 9. The pins 17, 19 have locking notches 88, 90 in which cylindrical tongues 80, 8 are inserted.
9. The cassette according to claim 8, wherein the locking hooks 92, 94 at 2 are lockable.