US624561A

US624561A - steljes

Info

Publication number: US624561A
Authority: US
Publication date: 1899-05-09
Anticipated expiration: 1916-05-09

Description

No. 624,56l. Patented May 9, 1899.

w. s. STELJES.

STEP BY STEP PRINTING TELEGRAPH.

(Application filed Feb. 16, 1899.)

' 3 Sheets-Shee I.

(No Model.)

No. 624,56I. Patented May 9, I899. W. S. STELJES.

STEP BY STEP PRINTING TELEGRAPH.

(Application filed Feb. 18, 1899.) (N6 Model.) 3 Sheets$heet 2.

TNE NORRIS PETERS co, PHOTO-LUNG wAsnmgToN. a. c.,

No. 624,56l. Patented May 9, I899. W. S. STELJES.

STEP BY STEP PRINTING TELEGRAPH.

(Application filed Feb. 16, 1899.) (No Model.) 3 Sheets-Shaet 3.

Wibzessw. [7w I vUNITED STATES PATENT OFFICE.

WALTER SAMUEL STELJES, OF LONDON, ENGLAND.

STEP-BY-STEP PRINTING-TELEGRAPH.

SPECIFICATION forming part of Letters Patent No. 624,561, dated May 9, 1899.

Application filed February 16, 1899. Serial No. 705,609. (No modell) To all whom it may concern:

Be it known that I, WALTER SAMUEL STEL-.

JEs, engineer, a subject of the Queen of Great Britain, residing at Mountview, Mount Pleasant road, South Tottenham, London, in the county of Middlesex, England, have invented certain new and useful Improvements in Stepby-Step Printing-Telegraphs, of which the following is a specification.

I11 step-by-step printing-telegraphs it has before beenproposed to drive both the type wheel and an axis for effecting the printing and feeding forward of the paper by weights or springs. It has also been proposed to use one magnet having two armatures, one for operating the escapement used for controlling the turning of the type-wheel and the. other for operating the escapement used for controlling the turning of the printing-axis.

My improvements relate to an improved construction and arrangement of the electromagnet and its armatures to allow of its being operated by very light reverse currents from a magneto-machine'and also to improved means for shifting the type-wheels along their axis to bring one type-wheel into acting position when the other is moved away from that position. My improvements are shown in the drawings annexed. Figure l is a face View of the machine. Fig. 2 is a side elevation of the electromagnet and the two axes whose revolution it controls,.the one axis carrying the type-wheels and the other controlling the printing and moving forward of the paper. Fig. 3 is a partial plan view showing these parts. Fig. 4 is a side view of the type-wheel axis when this axis is in the position shown in Fig. 3. Fig. 5 is a similar view with some of the parts in a different position. Fig. 6 is an elevation of the type-wheel-escapement armature, looking at the front face or that adjacent to the magnet. Fig. 7 is an end view of the same; Fig. 8, an elevation of the rear face of the same. A and B are two trains of wheels, each driven by a spring or weight. The train of wheels A drives the type-wheel axis '0, and the train of wheels B drives the axis D, which controls the printing and feeding forward of the paper. Y

O are type-wheels.

E are the core-pieces of the eleotromagnet. E are arms extending sidewise from these cores in parallel planes at a distance apart from one another.

G is an armature in front of the ends of the arms E and fixed centrally upon a vertical axis G, one end of the armature being opposite to the end of one arm and the other end of the armature opposite to the end of the other arm. The armature is also divided across the middle and a piece of brass y or other non magnetic substance interposed between the two parts, thus interrupting the magnetic continuity of the armature at or about midway of its length.

H is an armature carried by a lever H below the lower ends of the cores E. The upper ends of the cores E are attached to one end of apermanent magnet F. The other end of the permanent magnet comes at the back of the armature G and very effectively magnetizes the two parts of this armature to one polarity, while the electromagnet-cores E are magnetized to the opposite polarity.

By mounting the armature G upon a central axis in the above way, with one of its ends opposite to one arm E and its other end opposite to the other arm, the two armatures can, as shown, he kept at a considerable distance apart from one another, so that the magnetic field acting upon the one armature is well away from the magnetic field acting upon the other armature, and the armature H is but little, if at all, affected by the magnetism of the permanent magnet F, whereas heretofore when one polarized magnet has been used for operating upon two armatures the side wise extensions or arms of the magnet-cores have been made to face toward one another, and one end of a polarized rocking armature has been arranged to oscillate to and fro between them. This armature and the arma ture in front of the ends of the magnet-cores have thus been brought into close proximity.

By dividing the armature G across the middle its movements are rendered perfectly steady and uniform and it responds readily to every alternation of current, and although a slightly-stronger current may be required by reason of the extent to which the magnetic circuit of the electromagnet is completed through the armature being somewhat re the other end of the armature is repelled from the other arm E, and the armature is thus rocked to and fro at the same time the armatu re H is attracted to the cores E and remains held up so long as alternate currents are passing. \Vhen the currents cease to pass, the armature H drops away from the magnetcores.

G is a tooth or pallet carried by an arm which extends from the armature-axis G. As the armature is rocked this pallet engages first with the teeth of one escapement-wheel l, which is fast on the type-wheel axis (J, and

then with the teeth of another escapementwheel I, which is alongside it, each movement allowing the esca1: ement-wheels to make a partial turn, and so the type-wheel axis 0 is allowed to revolve with a step-by-step movement so long as alternate currents are passing through the coils of the electromagnet.

The lever H, which carries the armature H, also carries two pallets I-l H against one or other of which a blade projecting from an arm D, which is fast on the axis D, rests. The blade rests against the pallet H so long as the armature remains attracted to the magnet-cores E; butwhen currents cease to pass and the armature drops the pallet 11 is moved away from in front of the blade and the arm D makes approximately a complete revolution. The blade upon it then comes against the pallet H and is arrested by this pallet and remains arrested by it until the armature H is again attracted. This movement carries the pallet H out of the way of the blade on the arm D, and the blade comes against the pallet 11 and is arrested by it until the armature again drops. to make a complete turn in the way above described, an eccentric D upon it lifts the leverarm J, which turns on an axis at J, and then again lowers this arm. The lever-arm car-- ries a roller J over which passes the strip of paper X to be printed on. When the leverarm is raised, it brings the paper against whichever letter on the under side of the type wheel is opposite to it and causes this type to make its impression upon the paper. V hen the leveragain descends, a pawl J acting upon a ratchet-wheel fast with the roller J gives a partial turn to this roller and so feeds forward the paper ready for the next impression.

The rocking movement of the armature G is limited by adjustable stops G and the Whenever the axisD is allowed rocking of the lever H, which carries the armature H, is limited by similar adjustable stops H The armature H is also never allowed to come into absolute contact with the cores E of the electromagnets. Preferably also its face is covered with paper or like material, so that the magnetic circuit of the electromagnet is never absolutely complete through good magnetic conducting metal, and therefore the fact of the armature H being held up to the magnet-cores E does not prevent the polarity of these cores being varied when a1- ternate currents are passed through the magnet-coils, and consequently does not prevent the polarity of the arms E, which extend from the cores or pole-pieces, being in this way varied at each reversal of current, so that they may serve to rock the armature G.

Two type-wheels O are, as shown, carried side by side on the type-wheel axis C. These can be pressed endwise along the axis by a coiled spring 0, but cannot turn around it.

K is a small metallic slide which passes through a slot formed transversely through the axis 0. On the slide is a V-shaped projection K. The boss 0 which carries the typewheels, carries at its end a small roller 0 which by the action of the coiled spring 0 is always kept bearing against one or other inclined side of the V projection. lVhen it bears against one incline, one type-wheel is in position for printing,and when it bears against the other the other type-wheel is in position for printing. The two positions are shown in Figs. 4 and 5. A pin K restrains the slide from being moved too far in one direction. A link K which is jointed to the axis 0 and to the slide, restrains the slide from being shifted too far in the opposite direction.

WVhenever the rotation of the type-wheel axis 0 is arrested at the time when one or other end of the slide K is opposite to the project-ion L on the printing-lever and the printing-lever is lifted in the manner above described, the projection comes against the end of the slide and moves the slide endwise, so causing the type-wheels to be shifted endwise along the shaft, whereby the type-wheel which before was in acting position is put out of action and the other takes its place.

What I claim is- IIO strument, the combination of the electromagnet, the side extensions from its two polepieces in planes at a distance apart from one another, the intermittently-driven printingaxis, its escapement,.the armature operating said escapement carried opposite the ends of the pole-pieces, the type-wheel, its intermittently-driven axis,its controlling-escapement, the armature operating said escapement and mounted centrally on an axis with its ends respectively opposite the ends of the side extensions from the pole-pieces of the magnet and having its magnetic continuity interrupted at or about midway of its length, the

permanent magnet magnetizing the polepieces to one polarity and the ends of the lastnamed armature to the opposite polarity, and means actuated on the operation of the printing-axis to take an impression from the typewheel.

2. In a step-by-step printing-telegraph the combination of the type-wheel axis, the crossslide carried by it, the two type-wheels, the spring holding these wheels. up to the crossslide, the printing-lever by which the crossslide can be struck and shifted endwise when- I ever the printing-lever is operated at a time and operating the printing-axis escapement, the armature operating the type-wheel-axis escapement and mounted centrally on an axis with its ends respectively opposite the ends of the side extensions-from said pole-pieces and having its magnetic continuity interrupted at or about midway of its length, the permanent magnet magnetizing the pole-pieces to one polarity and the ends of the last-named magnet to the opposite polarity, the cam on the printing-axis, the printing-lever which it operates, the cross-slide carried by the type- Wheel axis in such a position that it may be struck by the printing-lever and shifted end- Wise whenever the printing-lever is operated at a time when one or other end of the slide is WALTER SAMUEL STELJ ES.

Witnesses:

WALTER J. SKERTEN, WILFRED OARPMAEL.