US1753890A - Typewriting machine - Google Patents

Description

W 1930- c. A. JOERISSEN 1,753,890

TYPEWRITING MACHINE Filed May 24, 1928 2 Sheets-Sheet l @Hm ML: 3

April 1939- c. A. JOERISS EN 1,755,890

TYPEWRITING MACHINE Filed May 24, 1928 2 Sheets-5hee+ P Patented Apr. 8, 1930 PATENT OFFICE CARL A. JOERISSEN, OF WASHINGTON, DISTRICT OF COLUMBIA TYPEWRITING- MACHINE 2 Application filed May 24,

The present invention relates to improvements in typewriting machines, particularly of that type or class in which the type action includes means whereby normally the printing is effected by a gradual pressure as distinguished from a blow, or machines of the character which are termed noiseless- In an earlier application (Serial No. 167,734, filed February 12, 1927) I have disclosed a machine of the character referred to provided with means whereby, if desired, parts of the type action. can be so adjusted that the printing will be effected by a blo upon the platen.

Such a convertible machine is of considerable practical importance as it enables the operator to readily change the character of the type action to adapt the machine to the particular character of Work to be performed, i. e., for simultaneously producing a relatively large number of copies, the type carriers will s rike the platen as in ordinary ma-.

chines, while if only a few copies are desired, the printing can be effected by a gradual pressure, or the action will be practically noiseless.

The subject matter of this application is an improvement upon that of my prior ap-- plication referred to, and will be described in connection with the accompanying drawings, in which I F igurel is a more or less diagrammatic view partly in section ofa typewriting machine embodyin the present improvements, showing a type ar at rest or in its inactive position.

Fi ure 2 is a similar view showing the positlon of several parts when the type bar is in printing relation to the platen.

Figure 3 is a face view of one of the segments of the machine.

Figure 4 is a View similar to Figure 2 showing theparts in printing relation when the means that render the action noiseless are inoperative.

In the drawings I have illustrated only one of the series of type bars of the machine and the corresponding key lever and connections, and have shown the several parts of the machine, such as supporting segments, platen,

1928. Serial No. 280,274.

etc, more or less conventionally, as these parts may be of common construction and do not of themselves form any part of the invention hereinafter claimed.

Referring to the drawings, in the several 'figures of which'zlike reference characters designate corresponding parts, 1 indicates the platen, 2 a type bar segment, 3 a second segment, arranged in advance of the type bar segment and shown as provided with a rest 4 upon which the outer ends of the type bars 5 rest when in inactive position.

The invention is illustrated as being embodied in a machine of the class in which the printing means comprises a platen and type carriers in the form of pivotally mounted type bars adapted to swing upward and rearward about pivots on the segment 2 to bring the type thereof into printing relation with the platen, but it is to be understood that the invention may be embodied in machines having type carriers of a different form.

' The type bar shown is of common form being provided with a head having a plurality of type faces thereon, the means for rendering the machine substantially noiseless as hereinafter described being operativeregardless of relative shifting of the positions of the platen and type carriers, to render either of the type faces operative, which is a common feature of typewriting machines.

7 indicates a key lever, there being, as usual, one of such levers for each of the series of ty e bars 5. This lever is adapted to rock a sub-lever 8 when its outer end is depressed and such sub-lever is connected by a link 9 with a lever 10 fulcrumed on a segment 11 forming part of the typewriter frame. The curvature of the segment 11 corresponds with that of the segment 3, but has a longer radius. Each lever 10 is connected by a link 12 with a member 13 that is pivotally connected to the segment 3 before referred to, and the member 13 is connected to a member 1d of a toggle, the other member 15, of which is pivotally connected to the type bar 5.

The lever 10 is also connected, as by a link 16, with the toggle member 14 and in effect the parts 10, 16 form a second toggle.

Normally, or when the type bars are at rest, the several parts occupy the relative positions shown in Figure 1.

As any of the key leversis depressed the corresponding type bar will be swung upward and rearward about its axis, through the action of the toggles (1O, 16) and (14, 15). Just prior to the head of the type bar coming into contact with, or printing relation to, the platen 1 the members of the toggle 14, 15 will come into substantially straight line relation between the member 13 and the type bar and thus momentarily check the movement of the type bar toward the platen. At this time the several pivotal points of the toggle 10, 16 will not be in alignment and the continued movement of lever 10 by the downward movement of the key lever will, through the link 12, cause a slight rocking of the member 13 that the completion of the movement of the type bar to printing position will be effected y a push or gradual pressure rather than by a sudden blow.

In the foregoing description and in the drawings, I have, as before noted, merely described only one type bar action and it will be understood that the connections between each key lever and its corresponding type bar will be duplicates of that described.

According to the present invention all of the pivotally mounted members 13 are supported on a single or common fulcrum rod 20 which lies within a. channel 21 formed in the segment 3 and means are provided whereby this common fulcrum rod'may be bodily adjusted so that the checking action of each t pe bar movement, due to straightening of the toggle 14, 15, will be rendered ineffective.

Various means may be provided for adjusting the fulcrum rod as above referred to. As shown, the fulcrum rod is a single wire which extends throughout the length of the channel 21 and has its ends 22 extending above the upper edge of the segment 3 and suitably threaded. On the threaded end sections 22 of the fulcrum rod are mounted nuts 23 which cooperate with the upper edge of the segment, or other parts of the machine, so that by turning said nuts the rod 20 may be bodily raised in the channel, for example, from the position shown in Figures 1 and 2 to that re resented in Figure 4.

he effect of this bodily shifting the fulcrum rod 20 is to so adjust the parts that movement of the type carrier 5 to printing relation with the platen will not be interrupted or checked but will be. a continuous uninterrupted movement causing the type bar to strike the platen with a sharp sudden blow as in the ordinary typewriting machine.

The operation of the invention may be briefly described as follows. As hereinbefore descrlbed, when a key lever 7 is depressed, the rocking of the toggle member 10 will be communicated to the toggle 14, 15 and the type bar 5 moved upward and rearward about its pivotal connection with the segment 2. As the parts come into position, represented in full lines in Figure 2, or the several fulcrums and pivotal pins of the toggle 14, 15 are in a straight line, the movement of the type bar toward printing position will be checked. Such checking will be momentary only as the final operation of the downward stroke of the key lever will, through the link 12, rock the pivotal member 13 slightly into the position shown in dotted lines in Figure 2, thus resultin in a substantially straight line push-like action to the toggle 14, 15 and the completion of the movement of the type bar to printing position which is illustrated in dotted lines in Figure 2. The result of thus normally checking the movement of the type carriers from inoperative to printing position and complete such printing movement by a push or gradual pressure instead of by a sharp blow on the platen will make the action of a machine embodying the present invention practically noiseless.

If, however, it is desired to simultaneously produce a considerable number of copies, the checking means referred to is rendered inoperative and each type bar caused to effect the imprint by a sharp sudden blow as in ordinary machines.

' This is effected by turning the nuts 23 to bodily raise the fulcrum rod 20 in the channel 21 in the segment 3. The effect of such vertical adjustment of the fulcrum rod is to move the pivotal connection of the toggle member 14 slightly nearer the platen than it keeps with the parts in the relation shown in Figure 1, and as a result the toggle members 14, 15 do not come into a straight line relation prior to the type bar making contact with the platen or reaching printing position. This arrangement is shown in Figure 4.

The invention provides a very simple means for converting a noiseless typewriting machine into one of the class commonly used where the imprints are effected by sharp blows. Various means can, of course, be provided for shifting the fulcrum rod, the one illustrated and described being merely given as an example.

What I claim is:

1. In a typewriting machine, the combination of a platen, a series of type carriers, a series of key levers, one for each type carrier, each adapted to effect movement of the associated type carrier to printing relation to the platen, means for checking such movement of each type carrier prior to its reaching printing position including a toggle, one arm of which is connectedto the type carrier, a member pivotally mounted in the machine frame and connected to the other arm of the toggle, a common fulcrum rod connecting all of said members with the machine frame, and means for bodily shifting said rod to render all of the checking means inoperative.

2. In a typewriting machine, the combination of a platen, a series of pivotally mounted type bars, a series of key levers, one for each type bar, each adapted to effect swinging movement of the associated type bar to printing relation to the platen, means for checking such movement of each type bar prior to its reaching printing position, including a toggle, one arm of which is connected to the type bar, a member pivotally mounted in the machine frame and connected to the other arm of the toggle,- a common fulcrum rod connecting all of said members with the machine frame, and means for bodily shifting said rod to render all of the checking means inoperative.

3. In a typewriting machine, the combination of a platen, a series of type carriers. key levers, one for each carrier, members, corresponding in number to the key levers and type carriers, pivotally mounted in the frame of the machine, a common fulcrum rod connecting all of said members to the frame, a toggle having its arms respectively connected to each type carrier and the associated pivotally mounted member, means connecting each said member and associated key lever, whereby when the key is depressed the type carrier will be moved to printing relation with the platen, the toggle acting to check such movement of the type carrier prior to the latter reaching printing position and the pivotally mounted member being subsequently rocked to carry the type carrier to printmg position, and means for adjusting the said fulcrum rod to render all of the toggles ineffective to check movement of the typev carriers.

4. In a typewriting machine, the combination of a platen, a series of type carriers, key levers, one for each carrier, members, corresponding in number to the key levers and type carriers, pivotally mounted in the frame of the machine, a toggle havingits members respectively connected to each type carrier and the associated pivotally mounted member, a second toggle having its members respectlvely connected to the outer member of the first toggle and to a fulcrum on the machine frame, connections between the last said toggle member and associated key lever, and a link connecting the last said toggle member with the associated pivotally mounted member, whereby when any key lever. is actuated the corresponding type carrier will be moved to printing relation with the platen, such movement being checked by the first said toggle prior to the carrier reaching printing position and being completed by a rocking of the pivotally mounted member.

5. In a typewriting machine, the combination of a platen, a series of type carriers, key levers, one for each carrier, members, correspondng in number to the key levers and type carriers, pivotally mounted in the frame of the machine, a toggle having its members respectively connected to each type carrier and the associated pivotally mounted member, a second toggle having its members respectively connected to the outer member of the first toggle and to a fulcrum on the machine frame, connections between the last said toggle member and associated key lever, a l nk connecting the last said toggle member with the associated pivotally mounted member, whereby when any key lever is actuated the corresponding type carrier will be moved to printing relation with the platen, such movement being checked by the first said toggle prior to the carrier reaching printing position and being normally completed b a rocking of the pivotally mounted mem er, and means whereby the first said toggle will be rendered ineffective to check movement of the type carrier.

6. In a typewriting machine, the comblnation of a platen, a series of type carriers, key

levers, one for each type carrier, members,

corresponding in number to the key levers and type carriers, pivotally mounted in the frame of the machine, a common fulcrum rod connecting all of said members to the frame, a toggle having its members respectively connected to each type carrier and the associ-' ated pivotally mounted member, a second toggle having its members respectively connected to the outer member of the first said toggle and to a fulcrum in the frame of the machine, connections between the last said toggle member and the associated key lever, a

link connecting the last said toggle member with the corresponding pivotally mounted member, whereby when any key lever is actuated the corresponding type carrier will be moved to printing-relation with the platen, such movement being checked by the first said toggle prior to the carrier reaching printing position and being normally completed by a rocking of the pivotally mounted member, and means for bodily adjusting the said fulcrum rod to render the first said toggle ineffective to check movement of the type carr1er.

' 7. In a typewriting machine, the combination of a platen, a type bar segment, a series of type bars pivotally mounted on said segment to swin upward and rearward into printing relation to the platen, a second segment in advance of the type bar segment,

members, one for each type bar, pivotally when a key lever is depressed the corresponding type bar will be swung about its pivot into printing relation with the platen, such movement being normally checked by the toggle before the type bar reaches printing position and completed by a rocking of the corresponding pivotally mounted member, and means for adjusting the fulcrum rod relative to its supporting segment to render the toggles ineffective to check movement of the type ars.

' 8. In a typewriting machine, the combination of a platen, a type bar segment, a series of type bars pivotally mounted on said segment to swing upward and rearward into printing relation to the platen, a second segment in advance of the type bar segment, a

fulcrum rod extending through a channelformed in the said second segment, members, one for each type bar, independently fulcrumed on said rod, a toggle having its members respectively connected with each type bar and the corresponding pivotally mounted member on said second segment, kev levers, one for each type bar, extending elow both said segments, means connecting each key lever with the corresponding toggle and pivotally mounted member, whereby when a key lever is depressed the corresponding type bar will be swung about its pivot into printing relation with the platen, such movement being normally checked by the toggle before the type 'bar reaches printing position and completed by a rocking of the corresponding pivotally mounted member, and means adjustably connecting the fulcrum rod to its supporting segment so that said rod may be bodily adjusted to render the toggles ineffective to check movement of the type bars.

In testimony whereof I have hereunto set my hand.

CARL A. JOERISSEN.

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