DE1786075C - Drive device for type levers in power-driven typing machines or similar office machines - Google Patents

Description

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30th

The invention relates to a drive device for type levers in power-driven writing or Similar office machines with a drive rocker under the action of a drive spring for the type lever gear, with the drive rocker to its pivoting movement via a cam a A cam disk can be coupled with a continuously rotating power drive for the purpose of swiveling in the type carrier can be released into the printing position and driven for the pivoting back movement.

Such an arrangement is known from US Pat. No. 3,151,722. When striking One of the character keys falls into the area of the drive rocker and switches at the same time the clutch of the cam gear for the drive rocker via a switching bridge. The incursion the drive rocker can only take place after this coupling, which leads to a time delay of the working stroke of the drive rocker.

The invention is based on the task of the swinging of the drive rocker in to accelerate the working stroke and in this way to achieve a higher stroke frequency.

This object is achieved according to the invention in that the cam disk has a locking pawl What can be locked is that an unlocking mechanism which releases the locking pawl when a key is pressed is provided, and that the switching cam when the cam is released by the the drive arm executing the working stroke is pivotable. This can prevent the collapse of the Drive rocker take place at the same time as the button is pressed.

The figures show exemplary embodiments of the invention.

The drawings show in

1 shows a side view of the drive device in the starting position,

el with an ant bshe-

b \ 2 W further with a not provided unu in C = Cn ₁ segment rotatably mounted type Heb "! ■ .- ■ '■ ·"! ■, ien. This drive lever 2 can not get into the pressure edge 3 of an Aruriebs _sc jv \ Tv .lriebssch \ viiV "-5 isl a Ürertraeunost <cm.-u 20 iu ^ ordcl designed as a role, which reads by the Kr.ift ± v drive; :: r4 against a control edge 27 of a Sclvveniii'-l-ls 28. This pivot lever 28 has a cam follower element 29 designed in the form of a Roüe, which interacts with switching cams 30 of a cam disk 31 (FIG. 4). The one from an injection-molded synthetic material ci! Existing cam disk 11 is also provided with switching cams 25, which can be controlled via a release pawl 20. This release pin 20 is mounted with an elongated hole 23 on an axis 19 and is guided in a longitudinally movable manner by bends 21, 22 on a pawl carrier 15. This pawl carrier 15 is also arranged pivotably on the axis 19. Incidentally, the release pin 20 is under the action of a spring 24. The pawl carrier 15 is urged clockwise by a spring 14 and is held in the rest position against a stop 44 (FIG. 2). In the starting position, the pawl carrier 15 rests with a bend 17 arranged on its arm 16 on an arm 18 of a release lever 13 which is bent at an angle. This release lever 13, acted upon clockwise by a spring 12, is arranged pivotably on an axis U and is constantly in operative connection with an arm 10 of a switch-on bridge 8. This switch-on bridge 8 can be pivoted about an axis 9 and has a continuous edge 7 which can be acted upon by the ends 6 of the drive lever 2.

A disk 33 is also connected to the cam disk 31, on which a coupling pawl 34 is rotatably mounted. This coupling pawl 34 engages with an arm 35 (FIG. 2) in a guide groove 36 of a control disk 37. The cam 31 with the switching cams 25 and 30 and with the disk 33 and the control disk 37 are connected to one another by a spring 38 and provide the actual gearbox 48 (FIG. 5). The control disk 37 is provided with a stopper 39 which cooperate with the cam follower element 29. In addition, there is a recess in the control disk 37 40 (Figure 2) arranged in which the arm 49 of the coupling pawl 34 is freely pivotable. This Arm 49 of the coupling pawl 34 is provided with a pawl tip 50 which is marked with a continuously in the direction of the arrow revolving gear 41 can be brought into engagement, which via a drive wheel 47 (Fig. 4) is driven by the engine. The pawl carrier 15 pivotable about the axis 19 is fork-shaped Recess 42 with a slightly sliding edge 45 on the pawl carrier arm 46, which with a

the pivot lever 28 arranged roller 43 cooperate.

The mode of operation of the subject matter of the invention is as follows:

When a button lever i is pressed downward, the edge 7 of the switch-on bridge 8 is acted upon via the end 6 of the associated drive lever 2. Here, the switch-on bridge 8 is pivoted around the axis 9 clockwise in such a way that .Lx release lever 13 is pivoted about the axis 11 in a counterclockwise direction. As a result, the angled arm 18 of the release lever 13 is moved away from the suspension 17, whereby the pawl carrier 15 is moved clockwise under the action of the spring 14. Here, the release link 20: it is also moved downwards, as a result of which the switching cam 25 is released, which is connected to the nose of the release link 20 in the exit slot. Due to the action of the Aniriebsfeder4 the Ar.triehs- ■ • '■ nvinge5 are now clockwise, the Schwcnkhe- so UA 28 via the transmission member 26 and the control - .. ante 27 clockwise and the cam 31 rather the Nockenfolicelement 29 im Rotated counterclockwise. This pivoting of the cam disk 31 is facilitated by means of run-up bevels 32 on the halos 30, which are in operative connection with the cam follower element 29. The cam disk 31 with the switching cam 30 is rotated by the force of the released spring 4 so far that the cam follower element 29 of the pivot lever 28 can fall into the recess 40 between the switching cams 30. Via the selected drive lever 2, the assigned type lever gear receives an impulse for the impression movement.

At the beginning of the drive movement of the drive rocker 5, when the cam disk 31 is rotated, the coupling pawl 34 is rotated clockwise, since the control disk is initially still held by the cam follower element 29 via a stop cam 39. During this movement, the spring } H between the control disk 37 and the cam disk 31 is biased even further and the coupling pawl 34 can move into the recess 42 of the control disk 37 (FIG. 2). Only when the pivot lever 28, which is frictionally coupled to the drive rocker 5, falls into the recess 40 of the cam disk 31, the spring-loaded control disk 37 is released (FIG. 3). The control disk 37 is rotated counterclockwise by the action of the spring 38. The clutch pawl 34 is rotated about its arm 35 in a counterclockwise direction and with its pawl tip 50 with the continuously circulating in Pteilrichtung gear 41 ~ ■

Intervention brought. This coupling must be done

if the cam follower * of the Sc

28 the deepest point in the recess 40

the switching cam 30 of the Nockensche.be 31 reach

After the coupling process, the N <xkenscheibe 31 with the switching cams 25, 30 and ^ control disc 37 from the sländ.g. ^uml f ^ufe "^, ⁿ gear 41. Here the ^ akenfoheelemen! 29 is brought into NV.rkverbmdu. ^ with the next signal ... 30 of the cam disk 31 in such a way that the pivot lever 28 and the λ- _r friction rocker5 back to their original position -u will be returned to y).

Lim an exact control / u ermoiliaieiu «- those of the Kimkträger 15 and the Aus.yseklinK. .- <be ready! the drive movement t; ei Aiu.u .. '. · swing over the roller 43 which is attached to the pivot lever 28 in a double-sided manner; :: i. This is made possible by the fact that the KoUe at oeni scm.c ^ · lever 28 during the A'K-iKbewe.i-um; dei -vi triebsschwi'ü: e5 / unädist -..'- en di ·? kscr; t angi;, - iende edge'45 of the pawl ;; .. Rcrarr, vs M, MoLU mw dc'nn in the Aus ^ paiimg -H Rides (according to ^ LI ": J? ■ · ■ DaΓC! NV IUl UL "ί \ · ιπΜ:! Xn:; ^ i« - ''""""''

latch 20 deian .ii ^ lifted. ^ aB mcIi the.> use. ucr release latch: «ivivü, wk ^ ■ in the action _t vr, .d) der Schaimnu, en .11 l.eü-i.ki. \ wnn das Nock «.- nto geelemen: 29 an .kn Sch ·. ·. ·.: ;;: ehel 28 >'vx Amaulschrä ^ eu M au den Scha ^; ; :: .. eke ;: 30 ene; cht a.it, the IJewec ..- 'ι; Λ, · v. , .. ·:, cl: .-: be 37 by striking the An-J ₁ Ia ^ n, -k ,, -, i «^ en .I ^ Cams Fokeelenicni 29:,.: E.uk- ΙΙ: \ · Ί.; .. ιη:! Ι wirO cn. · Coupling! Disengaged · 34 w; - '. Ie- a; i; ..- r r.:nani! nnl uem constantly revolving /,.-'^ -Jl ^ "IiU-Mi. Also comes de, Sch;.; :: - ,. ■■ -. ■.: '· ■ .Li ₁ .er nose of the release pawl 2C / i, r Ai--: i: · ^ ^> c * compulsory control of the Λ ■ >> - Λ \ -. 1 ■ 2tt becomes a safe switching- 'dei \ .v; ■■■ h <:' ■ '- 31 and thus the power drive gt ^.:'''.'■ ·. L ;; i --.- U.

When the i ^.-: o 43 during the return movement of the Schwenklicheis -?.! Slides out of the recess 42, the pawl carrier 15 falls with the bend 17 of its arm 16 by the height "α" onto a bend 18 of the spring-loaded release lever 13 (according to FIG. 3), which has since returned to the basic position.

Due to the automatic start-up of the drive rocker 5 when the switching cams 25 are released The cam disk 31 and thus the drive spring 4 enable a high writing speed.

For this purpose 2 sheets of drawings

Claims (2)

Patent claims: 1. Drive device for type lever in Kniftangeiriebenen Typewriters or similar office machines with a drive rocker for the type lever gear, which is under the action of a drive spring, wherein the drive rocker to its pivoting movement via a cam with a a cam disc which can be coupled to a continuously rotating power drive for the purpose of pivoting the Type carrier can be released into the printing position and can be driven for the pivoting back movement, characterized in that the cam disc (31) has a locking pawl (20) can be locked in that an unlocking mechanism which releases the locking pawl (20) when a button is pressed (8, 13, 15) is provided, and that the switching cam (30) when released The cam disk (31) can be pivoted by the drive rocker (5) executing the working stroke is. 2. Drive device, characterized in that the switching cams (30) have a run-up bevel (32) to facilitate the pivoting process. Fit ⁿ 'ine side view of the Antriebsei π reatung _{ku. 7} ^! ^; '. i _l , "after releasing the switch cams, Figure 7T, a side view of the drive unit / v. - .'- '. ■ - .,, Vr cam discs with the; Power- Pi3w! I ίνί -. 'Ί - ■■ ¹¹ -' - ^