DE2542259C2 - Tensioning device for a deletion tape transport device on a typewriter - Google Patents

Description

suitable for that.

benefits

The invention relates to a clamping device for a The clamping device according to the invention enables

Eraser tape transport device on a typewriter 40 with simple and few resources almost always one The machine in the preamble of claim 1 uniform tension of the erasing tape. With the help of specified Ar *. The subject of claim 2 is an easy adjustment

Is used when writing on a commercially available or readjusting the biasing force of the resilient Typewriter entered a wrong character, so end of coil spring possible must be the accidentally printed mark of 45 Explanation of the invention

Recording medium removed or made invisible ⁶

will. Known arrangements use this

so-called erasure tapes, which on the record the F i g. 1 and 2 explained in more detail. It shows side facing the carrier with an adhesive or F i g. 1 a top view of the extinguishing tape transport

Adhesive are coated on which after the 50 device and

Type stop the color mass of an initially mistakenly F i g. 2 individual parts of the clamping device in a diagram

printed character adheres and thus from the recording dear representation.

can be withdrawn again. Get in the fig. 1 is a recording device 1 with

such erasure tapes unintentionally, d. H. shown during fixed axes of rotation 3, 5, which no erase operation with the 55 to be inscribed to accommodate a take-up reel 7 and a If paper is in contact, there is a risk that surface supply reel 9 will serve for an erasing tape U. the Some parts of the paper stick to the erase tape. Take-up reel 7 is used with every correction process and thus the written text is illegible if not via a drive device (not shown) in becomes unusable. In order to avoid this, it is known that this must be rotated by a partial step. the The extinguishing tape must be kept taut at all times. 60 supply reel 9 is fixed with two bearing bushes 13 and 15

connected and by means of a locking washer 17

Prior art, _{the Dre} h _ac ket 3 axially secured. The lower stock book

The German Offenlegungsschrift 2164 748 contains se 15 has a hub 19, which is of some turns already a tension control system for upright at one end 21 of a loop spring 23 frictionally tion of the tension of an adhesive eraser tape so that 65 is wrapped around. The other end 25 of the wrap spring this not on adjacent parts of the typewriter 23 encloses one with a few turns with play ne or can stick to the recording medium. remote part 27 of the bearing bush 15 and thus the This device has been tried and tested, but it has an axis of rotation 3. Both ends of the wrap spring 23 point

Bends 29,31, of which the bend 29 at the resilient end 25 of the loop spring 23 in locking notches 33 arranged concentrically to the axis of rotation 3 can be engaged. This allows the The pretensioning force of the winches embodied as a torsion spring fertilizes the wrap spring 23 in the simplest possible way can be changed and adjusted. A readjustment of this pretensioning force is also very simple possible. The wrap spring 23 is wound so that its resilient end 25 on the over the extinguishing tape U. gradually driven supply roll 9 exerts a force acting against the pulling direction 39 and that you the other end only allows the supply reel to run freely in the withdrawal direction 39. This freewheel will this ensures that the bend 31 when the supply reel 9 is driven on a frame fixed Stop 35 of the receiving device 1 comes to rest. To the opposite to the pulling direction 39 To change the acting force of the resilient end 25 of the wrap spring 23, it is also possible to adjust the stop 35 to be arranged on the receiving device 1 and lockable.

In the normal position, the erasing tape 11 is according to Fig. 1 held tight in the solid representation. Here, the bend 31 lies against the stop 35 on, so that the end 21 of the wrap spring 23 designed as a one-way clutch, the supply reel 9 in Pulling direction 39 releases. But if the type carrier 37 is now from the solid line to the dashed line 1, the supply reel 9 is rotated somewhat in the withdrawal direction 39 and the erasure tape 11 released. The type carrier 37 now returns to the solid representation according to FIG Fig. 1 back, the erasing tape 11 would no longer be tight if not the resilient end 25 of the Loop spring 23 would reset the supply reel 9 against the puller 39. This lifts the bend 31 of the loop spring 23 from the stop 35, see dashed illustration according to Fig. 1. As soon as the erasing belt 11 is driven over the The take-up reel 7 is pulled again, then the supply reel 9 is also acted upon in the pull-off direction 39, whereby the bend 31 rests against the stop 35 again.

With the help of the wrap spring 23, the extinguishing tape 11 always held tight so that this does not affect other machine parts or the recording medium can stick. The wrap spring 23 serves on the one hand as an overrunning clutch and always has a braking effect, to keep the extinguishing tape 11 taut even when it is pulled off. On the other hand, the wrap spring 23 serves as Torsion spring in order to generate a force acting counter to the pulling direction 39 of the supply reel 9, as a result of which the erasing tape 11 is immediately pulled tight again after the printing process.

1 sheet of drawings

Claims (3)

ausub ■ still has a large number of individual parts. Due to the patent claims · locking mechanism there are also differences in the ratentansprucne. Belt tension cannot be avoided. 1. Clamping device for a deletion tape transport Weilerhin has the US-PS 26 ⁸ device on a typewriter with a ^^ J Spring arrangement we.che via a friction brake arrangement with an axis fixed around a gesture Cradle rotatably mounted inventories ^^^ T ^ X ^ ^ SSNs spool is in driving connection and which gradually to the case ausub an elastic force ■ Jj f 'J Jj ^ ^{kh "u"} n from the belt driven of stored io the coil against their response. coil a counter to the pulling direction This known A " ⁰ ^""" ^ «^^^^. ⁵ ^ "'^" exerts force, characterized by individual parts, but it is not suitable to use the Loschband Schlingfedcr (23), which with its one end (21) always with a predetermined tension to a few turns of a supply reel (9 ) keep. By ^shock . ^run f "^ I [^ _r ° l ^ka , ⁿⁿ frictionally wraps around the hub (19) and _{that is} , the tension of the erasing tape is reduced with its other end (25) with the recording. In addition, the adjustment or readjustment is a device (1) is connected and as a torsion spring of the biasing force with which the pressure element has against formed turns, which the supply reel is pressed, not securely enclose the axis of rotation (2) with play, and that as handle. Also be. This known arrangement Freewheel clutch trained, the hub of the front 20 differences in the tape tension cannot be avoided, ratsspule looping end (21) against the force task the resilient other end (25) through the. driven supply reel (9) can be carried along as far The invention is based on the object is until its bend (31) on a frame-mounted clamping device for the Loschband a Loschband stop (35) comes to the plant. 25 to improve transport device so that no 2. Apparatus according to claim 1, characterized in differences in the erasing tape tension both in indicates that this can occur with the cradle transport as well as at the workplace, connected resilient end (25) of the wrap spring (23) The clamping device should also consist of a few has a bend (29), which consist in concentric individual parts and can be easily adjusted. This to the axis of rotation (3) arranged locking notches (33) 30 task is marked with the in claim 1 The receiving device (1) can be locked in place. Neten invention solved. 3. Apparatus according to claim I, characterized by the German Auslegeschrift 22 32 773 is shows that the stop (35) on the recording already has a braking device with a wrap spring device (1) is arranged adjustable and lockable. known for the ribbon reel, but this device 35 is not intended to keep adhesive tapes tight at all times.