US2349483A - Typewriting machine - Google Patents

Description

May 23, 1944. F. WILLHEIM 2,349,483

\ TYPEWRITING MACHINE Filed Jan. 11, 1940 2 Shets-Sheet 1 I l/VVEN TOR Frazzcozls M'l/hcz'm ATTORNEY,

Ma 23, 1944. F, WILL E IM 2,349,483

TYPEWRITING MACHINE Filed Jan; 11, 1940 2 Sheets-Sheet 2 ATTOR/VE).

Patenterl May 23, 1944 Franeois Willheim, Vinay, France; vested Alien Property Custodian in the Application January 11, 1940, Serial No. 313,429 In France January 23, 1939 3 Claims.

The present invention relates to a device which is adapted to be mounted quickly on a typewriter and which consists, in principle, of an inking ribbon which is stretched, along the typing line of the typewriter, behind the sheet of paper on which the ribbon copy is made.

It is thus possible to obtain two copies of the typewritten text, viz.: a copy which is normally legible, on the front face of a sheet of paper interposed between the auxiliary ribbon and the platen of the typewriter, and another copy which is legible by transparency, on the rear face of another sheet of paper interposed between the auxiliary ribbon and the sheet of paper on which the normal ribbon copy is made. If it is not desired to obtain this second copy, it suffices to cover the corresponding face of the auxiliary ribbon with a protecting strip stretched against said face.

Just like the normal ribbon of the typewriter, the auxiliary ribbon gradually unwinds from a bobbin located on one side of the carriage of the machine and rewinds on another bobbin located on the opposite side. As for the normal ribbon, when the auxiliary ribbon has completely passed from one" bobbin to the other, the drive is reversed so that said auxiliary ribbon rewinds on the bobbin it has just left.

For actuating the auxiliary ribbon, use is made, according to the invention, of the return movement of the carriage of the typewriter.

The accompanying drawings show, by way of example, a presently-preferred embodiment of the object of the invention. In said drawings:

Fig. 1 is a perspective view showing the relationship of the parts of the said embodiment of the invention as applied to an essentially conventiona1 typewriter, the apparatus being shown in raised-inoperative position. I

Fig. 2 is a view, partly in section andpartly in elevation, showing more particularly the actuating members according to the invention; and

Fig. 3 is a view, partly in section and partly in elevation and on an enlarged scale, of the aforesaid embodiment.

As shown on the drawings, the device according to the invention comprises two casings or bearings IOI, I02 connected together by a tube I03. The casings or bearings IOI and I02 each carry a bracket I 04 (Fig. 2) having a hook at its free end. The brackets I04 are intended to hook on to a rod A provided behind the platen of the typewriter for which the device illustrated is intended (see Fig. 1). This method of attachment enables the device to be lifted readily to avoid interfering when changing the sheets on the machine, by simply swinging it about the rod A. It is obvious that the method of attachment should and can be appropriate for each type of typewriter to which it is desired to apply the device.

The outer face of the casing or bearing I0! is recessed on two diameters, the inner recess of smaller diameter accommodating a circular, shouldered fiange I06 formed on the inner end of a hollow mandrel iii'l on which one of the bobbins C is fitted. The flange I06 is held in its housing by a ring I08 seated in the recess of larger diameter and overlapping the shouldered flange of the mandrel, while permitting the mandrel to rotate. The bobbin C is provided with the usual recess to fit over a pin I09 projecting laterally from the shouldered flange of the mandrel. The bobbin is held in place on its mandrel by a knurled nut III] screwed on the threaded outer end of the mandrel.

The casing or bearing I02 is similarly though more deeply recessed to form a bearing for the external flange I06 integral with a hollow mandrel. I01 for the other bobbin C.

I08'in such a manner that it can rotate. The knurled nut I I0 retains the bobbin C on its mandrel.

Between the flange I00 and the bottom of the deeper recess in the bearing or casing I02 is arrangeda ratchet wheel III, on the hub of which is loosely mounted a washer or pawl carrier H2 on which is mounted a pawl H3 held in engagement with the ratchet by a spring H4. The washer H2 is itself connected to the casing or bearing I 02 by a spiral retracting spring H5 (Fig. 2). Said pawl carrier is provided with a radial arm H6 projecting from radially out of the casing or bearing through an appropriate arcuat-e opening I I! that enables it to oscillate through a certain angle. A jaw H8 is pivoted at H0 to the arm H6 in such a manner as only to move same when said jaw is subjected to a push. Said jaw carries a roller H9 on a longitudinal spindle. The roller H9 is positioned so as to co-operate with a ramp or cam member R provided on a fixed part of the typewriter, on the right hand side thereof, as shown in Fig. 1, the roller II9 wiping over the cam R, at each return movement of the typewriter carriage, to rotate the ratchet I I I by imparting a partial rotation to the washer or pawl carrier I I2 carrying the pawl I I3.

The flange I05" is held in place in its housing by a ring:-

The ratchet III is slidably mounted on a square part I of a shaft I20 which passes through the tube I03, the ends of the shaft extending beyond the outer faces of the bobbins C, C. Knobs I2 I, I22 secured to the projecting ends of the driving and ribbon reversing shaft I20 enable the shaft to be manually slid longitudinally, a distance limited by the abutment of the knobs, against the outer ends of their respective mandrels I01, I01. The shaft I20 is further provided, at predetermined points in its length, with squared portions I20, I20 spaced apart a distance less than the distance between the opposite mandrels I01, I01 on which the bobbins C, C are mounted. Each mandrel I01, I01 is provided with a similarly shaped bore to accommodate the adjacent squared portion of the shaft I20 when the latter is lid axially in one direction or the other. Such axial movement of the shaft in either direction is of such extent as to enter one of its squared portions in the square bore of the appropriate mandrel and to disengage the remaining squared portion from its adjacent mandrel.

The ratchet III is likewise provided with a square bore in which the squared portion I20 of the shaft I20 is slidable but at no time disengageable from the ratchet.

In the position shown in Fig. 3, the shaft I20 is completely slid towards the right. Its square part I20, which is constantly connected to the ratchet I I I, is furthermore engaged in the square bore of the mandrel I01. On the contrary, the square part I20 is completely disengaged from the mandrel I01. Therefore, with this adjustment of the shaft I20, the mandrel 01 is actuated at each actuation of the arm H6, and the auxiliary ribbon D is wound on the bobbin C. If, on the contrary, the shaft I20 has been pushed completely towards the left, it still remains connected to the ratchet III, but is no longer connected to the mandrel I01, whereas it is connected to the mandrel I01. In this case the bobbin C is actuated and on which the ribbon winds.

At I23 are shown the guides through which the ribbon is threaded and by means of which the ribbon is caused to travel parallel with the platen. These guides I23 are well known, and are spaced apart a sufiicient distance to accommodate, in the intervening space, paper sheets of a width somewhat greater than the length of the lines to be typewritten thereon when using the duplicating or auxiliary ribbon, to enable the ribbon to be directed between the paper sheets from side edge to side edge thereof as it leaves and returns to the bobbins. Said guides are provided at I24 with projections which are likewise known and to which are hooked the ends of the protecting strip with which the auxiliary ribbon is covered when it is desired to obtain only one copy of the typewritten text.

While I have illustrated and described the preferred form of construction for carrying my invention into effect, it is understood that such is capable of variation and modification, without departing from th spirit of the invention. I therefore do not wish to be limited to the precise details of construction set forth, but desire to avail myself of such modifications as come within the scope of the appended claims.

I claim:

1. In a typewriter having a main frame and a platen carriage, the combination comprising two bobbins, a mandrel for each bobbin, bearings for said mandrels, rigid connecting means between said bearings, supporting brackets for said bearings pivotally engaging and movable with said carriage, an auxiliary ribbon adapted to wind on and unwind from said bobbins, guiding means on said bearings for said auxiliary ribbon, selective mandrel actuating means carried by said bearings and means for operating the particular mandrel actuating means selected, said last-named means including an arm connected to said mandrel actuating mean and projecting from a bearing and a cam member on said main frame arranged in the path of movement of said arm as the latter moves with said carriage, said cam member engaging and displacing said arm during its movement in said path and thereby simultaneously displacing and moving the mandrel actuating means.

2. In a typewriter having a main frame and a platen carriage, the combination comprising two bobbins, a mandrel for each bobbin, bearings for said mandrels, rigid connecting means between said bearings, supporting brackets for said bearings pivotally engaging and movable with said carriage, an auxiliary ribbon adapted to wind on and unwind from said bobbins, guiding means on said bearings for said auxiliary ribbon, a slidable shaft extending through said mandrels, said mandrels having irregularly shaped bores in which said shaft is positioned, two spaced portions upon said shaft shaped similarly to said bores and adapted to be engaged selectively in said bores, ratchet means for rotating said shaft, stationary cam means on said frame for operating said ratchet means, and an arm projecting from said ratchet means and intermittently engageable and displaceable by said cam means as the carriage moves up and back on the frame, whereb said ratchet means is simultaneously intermittently actuated and said shaft rotated.

3. In a typewriter having a main frame and a platen carriage, the combination comprising two bobbins, a mandrel for each bobbin, bearings for said mandrels, rigid connecting means between said bearings, supporting brackets for said bearings pivotally engaging and movable with said carriage, an auxiliary ribbon adapted to wind on and unwind from said bobbins, guiding means on said bearings for said auxiliary ribbon, a slidable shaft extending through said mandrels, said mandrels having irregularly shaped bores in which said shaft is positioned, two spaced portions upon said shaft shaped sim-e ilarly to said bores and adapted to be engaged selectively in said bores, ratchet means for intermittently rotating said shaft, said ratchet means being slidably mounted on said shaft, cam means onsaid frame, and means projecting from said ratchet means and engageable and displaceable by the cam means on said frame for operating said ratchet means and thereby operating the selected mandrel to wind said ribbon in the bobbin thereon and unwind said ribbon from the other bobbin whose mandrel may turn freely upon said shaft.

' FRANCOIS WILLHEIM.

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