DE1561272A1 - Permanently empty key device for hand-operated typewriters - Google Patents

Description

PA. Γ £ NTA N IA ^ JiL TB PATENTANWA.LT DIPL.-ING. WEV ^ B MUNICH 22 · WIDENMAYERSTRASSE * ♦

PATENT LAWYER «OUtMÖWfl TELEFON 22S5B5 · TELEGRAMS: PROP.NDUS

1 BERLIN 33 (DAHLEM) · PODBIELSKIALLEE £ 8

TELEPHONE 742907 TELEGRAMS: PROPINOUS ΒθΓΐίΐΙ, (ΙβΠ 9 '. ΡβΖβΑΟβΓ 1966

17 722/23

Olivetti Underwood Corporation One Park Avenue, Hew York / USA

Permanently empty key device for hand-operated typewriters

The invention relates to a permanent blank key device for hand-operated typewriters "it a" carriage moving in the direction of the letter sequence under tension, the ait a "toothed one Switching element is connected, the bit cooperates with two switching pawls, which temporarily alternate in the toothed element can intervene to move the carriage one step further, one of the limps usually attached to the toothed limb is applied and under the action of a spring enters one of its tooth notches, and with a manually operated permanent empty key control device for first actuation of the limbs and with a KUckstellelement that can work together with the toothed link and is adjustable to keep the limps cut back for as long how the control device is held in the actuated position. It is very desirable that such car blanking devices comprise a device to the repetitive operations to be controlled in such a way that this occurs in a constant time t & t and “To be done in a cowardly manner. Yes, they are older machines

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repetitive switching operations usually by using have been separated from each other by weight devices, the one Reversal of motion required powers »to successive To enable carriage feed movements. It is obvious that such weight devices cause a slower switching speed of the trolley, cause bumps and lara and are also quite expensive,

In another known permanent empty key device, the permanent empty key control element causes a normally ineffective Lever works together with the ratchet wheel in order to make the two nicks absolutely repeatedly dependent on each feed step of the carriage. Since this lever is carried by the permanent empty key control element, the device is not operationally safe.

These disadvantages are determined by the permanent blanking device according to avoided the invention, which is characterized in that a predetermined tooth of the toothed switching element during each Vorwirtsrittes the carriage adjusts the bag adjusting element and this then mater spring action in successive tooth notches, just before the car is stopped each time, engages and that one becomes effective through elastic, upon actuation of the control device and through each adjustment of the bag adjusting element funds that are inevitably temporarily deferred movable element operated by the nicks, the elastic Means can effectively alternate the limps in their engagement with the toothed Sehaltglied only after the

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gradually moving vagueness inherent in energy is essentially reduced by the limp indented to stop the trolley, the trolley gradually becoming precisely delimited stepped forward.

In the drawings depicting a preferred embodiment of the Invention show is:

Fig. 1 is a perspective rear view of the new permanent switching device according to the invention in its «normal, the State of carriage advance;

FIG. 2 is a partial side view, seen from the right, of the permanent switching device according to FIG. 1 in its «an automatic Permanent empty key circuit causing state;

FIG. 3 is a perspective rear view of the permanently empty key device similar to FIG. 1, but in one of the trolleys intercepting state that «an receives as a result of a forward step of the carriage in the course of actuation a permanent blank key;

4 shows a rear view of an external circuit with a bucket of this

adapted permanent blanking device according to the invention.

The drawings “own the subject matter of the invention built into a normal hand-operated typewriter. As can be seen in particular from FIG. 1, the typewriter

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a paper roller 10, which is mounted in a roller holder, the right end 11 of which is shown. The vague has a rack 12 and is guided in the usual, not shown way £ VLt the forward and reverse runs parallel to the rack 12. A drawstring 13 is constantly under the action of a spring drive 14 which endeavors to pull the trolley together with the rack 12 in the direction of advance indicated by the arrow on the latter. However, the advance movement of the carriage is controlled by a switching device of conventional design , which has a toothed ratchet wheel 16 which is rotatably mounted as a unit with an axis 17 in a "derailleur frame 18". The ratchet wheel 16 is connected to the rack 12 via a drive pinion 20, whereby a conventional pawl (not shown) ait de tickle 20 is in singular engagement and thus causes the rack 12 in its by the arrow The direction of feed indicated with the indexing wheel is in drive connection · It is obvious that the construction which has just been described and not shown enables a fast carriage return without being hindered by the indexing wheel 16. The switching device also has a pawl or pawl 21 which is articulated to a conventional pawl arm 22 which is rotatably mounted on axle pins 23 which are attached to the switchgear frame 18. In response to the pulling action of the band 13, the ratchet wheel 16 is normally rotated as far as the pawl 21 resting against a stop 24 of the pivoting rocker 22 allows. One on the one hand at 27 aa the Sahara

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spring 26 fastened and on the other hand hooked into the pawl 21 The handle also sees constantly forward. and to the right in the machine. The forward pull has the effect that the pawl rocker 22 is normally limited against a screw head 28 is applied »so that the upper end of the pawl 21 does not have a tooth of the Ratchet wheel 16 can work together and block the carriage advance.

The carriage can be advanced by one switching step at a time causes a * usual, not shown Eiazelabstaad button will. When this button is actuated, the rocker arm 22 is pivoted counterclockwise with respect to FIG. 1 so that the Pawl 21 disengaged from this transversely to the level of the ratchet wheel 16 becomes and releases it. The tensioned spring 26 then rotates the pawl 21 with respect to FIG. 1 on the pawl scawiage 22 to the right against a stop provided on the latter 29 * un back into the Ratchet to be engaged and the next tooth of the same intercept. If the individual stop button is released immediately, the KÜakeaschwiage 22 immediately swings clockwise in it * shown in Fig. 1 * instantaneous position back the Kllake 21 brought in the way of the advancing, next schal trad-Salmes and the carriage is held by the Klink * 21, which * darca the Sad is led against the stop 24 of the rocker 22 · Wean the person writing the Eiazelabstaadstaste tta "hold s * tisi0 long * depressed" the car begins defiantly his "" goal step, with the mentioned next tooth of the

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Ratchet wheel 16 against a conventional helical tooth 30 (Pig. 2 and 3) provided on the rocker arm 22 in order to release the To force the key and thereby to ensure a one-step advance of the 'vag

All of the mechanics described up to this point belong to the known state of the art.

To control the permanent idle operation of the switching mechanism described, a swing arm 32 is rotatably mounted on the outer ends of the axle pins 23. A permanent blank key 33 (Fig. 2) is rotatably mounted at 34 and has an at 31 which is below the pulling action of a strong spring 35 normally rests against a stop 36. One connected to the swing arm 32 elastic means in the form of a spring 37 endeavors to move the bracket rocker 32 from the position shown in FIG. 1 into the The position shown in Fig. 2 is seven, but the Hick » Holfeder 35 for the permanently empty key 33 compared to the spring 37 • ine such a predominant force that the key arm 31 by Attachment against an arm 39 on the ironing arm 32 the latter in Venn's pre-emulation has been brought back by the permanent blank key 33 is pressed down, the spring 37 can, however, actuate the bracket rocker 32, with one provided thereon Zmage 3 · the link arm 22 in the one shown in FIG Position brings «ad the Πink · 21 ams dem schtwtrad 16, with which she was engaged, disengages. Consequently, the

Pawl 21 under the influence of its spring 26 on the tooth of the

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Ratchet wheel with which it was engaged, over to the Limitation of the stop 29 swing and temporarily remains outside the plane of the ratchet wheel 16. In the meantime, the overcomes Force of the spring drive 14, the moment of inertia of the carriage, so that the ratchet wheel 16 begins its step movement.

The first part of this stepping motion is for resetting the bracket swing arm 32 is used. An arm 41 is provided for this purpose hinged to an elbow 43. With each forward step of the ratchet wheel 16, the pivotable end of the arm 41 of a Tooth of the ratchet wheel 16 is moved outwards, as can be seen from FIG. 3. In this adjusted position, the arm 41 inevitably acts on an intermediate member 42 in order to bring the bow swing arm 32 back into its starting position, so that the limb swing arm 22 is inevitably brought back to its normal position under the influence of their spring 26 and so the limb 21 under the Spring action engages in the path of the ratchet wheel 16, which is necessary to limit the step feed of the carriage. As can be seen from Fig. 3, the arm 41 has at its end a seat 44 which, when the ratchet wheel 16, the pawl 21 against moves the limit stop 24, engages the arm 41, and then holds the bracket rocker 32 in the reset position.

Immediately before the carriage finishes stepping, \. by the ratchet pawl 21 reaching the limit stop 24, the end 44 of the arm 41, however, gives the barely the ratchet wheel tooth

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free, with whom it has worked together, through the bow swing arm 32 can be subjected to the actuating force of the spring 37 again. But on the one hand the vague has one at this point in time reached high speed and on the other hand is the moment of inertia of the rockers 32 and 22 in such a way that the pawl 21 first reaches the limit stop 24 and stops the carriage and that thus only the pawl rocker 22 is returned, to initiate the next advance step of the carriage. As long as the permanent key 33 remains depressed, more will take place Advance steps of the carriage, each of which is first precisely completed before the next is initiated. It should be noted, that the inertial shock that occurs every time the car is stopped ensures that the spring 37 is only effective in the Time can exercise when the shock decreases, which of a lot short duration. When the permanently empty key 33 is released, the bracket rocker 32 is immediately in the position shown in FIG Brought to the normal position, and the arm 41 no longer has any control over the yoke arm 32.

The intermediate member 42 is gate preferably via a link joint connected to the arm 41, which enables the latter to normally perform the function of a backstop. to a spring 46 is assigned to the arm 41 for this purpose.

Single step circuits can be activated by briefly pressing the Permanently empty key 33 are effected, the pawl rocker

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back to the starting position immediately after actuation returns «

It is obvious that the reason for the invention, According to which "i" connection to the input operation of the step-by-step switch, further movements of the same under the control the step feeds carried out by the carriage and with a lateral delay can easily be made to others as well switchgear is applicable. This is done, for example, in Fig. 4 demonstrates in which a ratchet wheel 16 ″ is controlled by a double-armed lock 47, the parts in this Figure ia their Vormalstteilung are shown. When «pressing down of a permanently empty key lever 33 'rotatably mounted at 34', one part of the lever rises and allows an angle lever 32 'to be actuated by a spring 37'. The angular lever swings 32 ' the lock 47 "so that the ratchet wheel 16" u "can turn one increment further. During such a partial step, a rotatable Ar «41 * through a tooth of the indexing wheel ·» 16 ' adjusted «ad inevitably sets the angle lever 32 'back against the action of the spring 37 *, whereby course before the end of the switching steps also the return of the blocking «47 is effected and the Ar «41 * under the tension of its spring 46 * behind« ine « the passing ratchet wheel shawl locks into place «so that the angle lever 32 * «after a time delay, the switching lock 47 is activated again actuated, does the next switching step of the ratchet wheel 16 * stt cause · * · It is obvious that further switching movements follow the blocking «47 as long as« the key 33 * remains depressed «

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Of course, the invention is not limited to the illustrated and described exemplary embodiments and application examples.

Patent claims:

«17 722/23

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Claims (6)

Claims 1. Permanently empty key device for hand-operated typewriters with one moving under tension in the letter sequence direction Carriage that is connected to a toothed switching element that works together with two switching pawls that can temporarily alternately intervene in the toothed element, to move one step further from the hunt, one of the The pawl normally rests against the toothed member and enters one of the toothed notches under the action of a spring, and with a manually operated permanently empty button control device for the first actuation of the ninks as well as with a reset element, that can work together with the creamed limb and is adjustable to keep the nails set back, soläage ■ how the control device is held in the actuated position, characterized in that a predetermined tooth of the toothed switching element (16, 16 ») during each forward step of the carriage (11) the Micks part element (41, 41 ·) is adjusted 909887/075? BATH ORIGINAL and this then under spring action in successive Tooth notches, just before the carriage (11) is stopped each time, engages and that one by elastic, when actuated the control device (33, 33 ') taking effect and through every adjustment of the resetting element (41, 41 ') is inevitable temporarily reset means (37, 37 ') actuated movable element (32, 32') which actuates the links (21, 41; 47), the resilient means actuating the limbs in their Intervention with the toothed switching element (16, 16 *) can only alternate effectively after the step-by-step energy inherent in the moving carriage (11) is essentially dissipated by the limb engaged to stop the carriage with the carriage moving forward in precisely defined steps. 2. Device according to claim 1, characterized in that a spring force (35), tfie is greater than the force of elastic coat (37) the control member (33) in normal position and holds the movable member (32) in a retracted position. 3. Device according to claim 1 or 2, characterized in that the movable element (32) via a one-way connection with the back part element (41) is connected, which the restoring element again after adjustment of the movable element can move back and allow an inactive adjustment of the movable element, while the control member (33) does not is actuated. 909887/0757 BAD ORIG'mai 4. Device according to claim 3, characterized by an intermediate member (42) which is hinged to one (32) of the elements and with the other element (41) via a nozzle joint (43) connected is. 5. Device according to one of the preceding claims, in which the toothed link is a ratchet wheel that runs across the Carriage advance direction extending axis is rotatably mounted, characterized in that the Ricks part element of a lever (41) which is movable in the plane of the ratchet wheel (16) and which is connected to the toothing of the ratchet wheel having cooperating, V-shaped curved end piece (44). 6. Device according to claim 5 »in which the normally indented pawl is rotatably attached to a rocker formed integrally with the other pawl, characterized in that the movable element is coaxial with one another dip swing arm (22) pivoting swing arm (32) is formed, the «iaem approach (38) which can pivot de Hlnkemschwimge (22). QaIBr - 17 722 / U 909887/0757 BATH