US1975057A - Transfer device - Google Patents

Description

Sept. 25, 1934. L. c. ANTRIM 3 9 TRANSFER DEVICE Filed July 13, 1932 uusuzzn AND UNCALENDERED PAPER.

Patented Sept. 25, 1934 TRANSFER DEVICE Louis C. Antrim, New York, N. Y., asslgnor to Autographic Register Company, Hoboken, N. .L, a corporation of New Jersey Application July 13, 1932, Serial No. 622,278

8 Claims. (01. 197-172) This invention relates to transfer devices, and more particularly, to transfer devices adapted to be used with writing machines such as typewriters, autographic register, and the like.

Heretofore, transfer devices have been made in the form of ribbons containing a pigment in a slow-drying vehicle such as glycerin and the like. These have been comparatively long-lasting, but have been limited in use to coaction with the 10 original or top copy of a pile of writing sheets so as to be struck on the one side with a type and thereby transfer the pigment to the adjacent sheet. The pigment was also transferred to the type, but this made little or no difference so far as the work produced was concerned.

When used between writing sheets, the impressions would be transferred to the back of one sheet as well as to the front of the other sheet, and this is very undesirable in many classes of work.

With transfer devices made of paper for autographic register work, it has been customary to saturate the paper with an oil soluble ink and here too the writing would occur on the back of the upper sheet as well as on the front of the lower sheet. In such use the double transference of the pigment and vehicle was an advantage because it would aid in detecting alterations of the copies made after the original writing operation was performed.

For typewriting use, it is an almost universal custom to have the transfer sheet or carbon paper, such as it is commonly called, contain On one side a coating .of paraffin or wax containing carbon or other pigment. This coating is forced or soaked into the paper by heat and pressure in order to increase the quantity of transfer material and hence the life of the transfer paper. Nevertheless the better qualities of carbon paper now manufactured are not serviceable for as many impressions as ink-containing ribbons or the impregnated transfer paper used with autographic registers.

An object of the present invention. is to provide a transfer device which will have a long life, will be serviceable for a substantially increased number of impressions, will make clear legible impressions, and be economical to manufacture, and yet be so arranged as not to transfer its ink or pigment to the back of the writing sheet in front of it and to transfer only the proper amount of ink solution to the writing sheet under it.

This has been accomplished in the form of the invention at present preferred by employing a sheet of paper substantially unsized, for instance suchas is known in the trade as waterleaf, impregnating it with an oil and pigment solution so that it is substantially saturated, then coating one side of the sheet with a lacquer or the like, such as pyroxylin, to render that side of the sheet non-transferring, and applying powdered metal, such as aluminum or bronze powders, to the other side of the sheet so as to retard the transference of ink from the transferring side of the sheet to the writing paper in contact with it.

It has been found that when an extremely soft sheet, such as waterleaf, is used, the ink solution in the sheet will be transferred to the writing sheet in too great a quantity for quick drying and long service, and that by dusting the transferring surface with a metallic powder, some of the minute pores of the sheet are choked, permitting the ink solution to be transferred in an amount regulated by the quantity of powder applied.

It has been found in practice that a transfer sheet, made in accordance with this invention, has the ability to redistribute the oil and pigment solution within itself, so that, if certain parts of the sheet are used more than others, ink spreads from the unused or little used portions to the used portions, and thus reconditions the used portions causing it to continue to give good legible impressions. It is believed that this reink- 35 ing of the used portions results from a capillary action of the relatively soft unsized paper sheet which is employed.

The transfer sheet of the present invention is advantageous and has great utility when used in the form of transfer disks such as are employed with my manifolding invention described in my copending application, Serial No. 410,477, filed November 29, 1929, now Patent Number 1,958,688, May 15, 1934, for its pyroxylin coating on one side stiii'ens the soft absorbent sheet so that it has good tractive engagement in the line of writing of the typewriter with the upper and lower writing sheets between which it is imposed and rolls on its bearing as a result of such tractive engagement as the line of writing is being written.

Other features and advantages will hereinafter appear.

In the accompanying drawing:

Figure 1 represents an edge view of a piece of paper from which the transfer device of the present invention is formed.

Fig. 2 is a similar view but represents the paper as being impregnated with oil soluble ink. 1'10 powder applied Fig. 6 represents the transfer device of the present invention as made in the form of a disk.

Fig. 7 represents the transfer device of the present invention as made in' the form of arectangular sheet.

As above pointed out the transfer device of the present invention comprises a sheet of paper 10 which is preferably unsized and uncalendered. While not essential it is frequently preferable that the sheet 10 be of a texture resembling waterleaf. This is preferred because of the large quantity of moisture which it will absorb and store.

This sheet 10 is impregnated with an oil and pigment solution or ink until it is wet through and through. This would make both the reverse side 11 and obverse side 12 of the sheet transferable when pressed into contactwith another sheet of paper or the like.

In typewriting work this is in many cases undesirable for it would cause writing to appear on the back of the record or first sheet as-well as on the front of the copy or the second sheet. To avoid this the sheet 10, as is diagrammatically illustrated in Fig. 4, is provided with a coating 13 of impervious material such as a lacquer, pyroxylin lacquer having been found particularly suitable to the work. When thiscoating- 13 is applied and ailowed to dry the ink-solution contained within the sheet 10 will not transfer from the obverse side 12 of the sheet to anything which is brought in contact therewith.

If desired the sheet 10 may be given a relatively light wetting of ink solution or it may be made of a close texture so that the ink will. not be transferred to an underlying writing sheet in too large a quantity for each impression, otherwise the impressions might not. dryrapidly enough and might offset on other papers coming in contact with the written sheet.

It is, however, preferable to have as much ink solution in the sheet as possible, yet avoid offsetting so as to prolong the serviceability of the transfer device.

This is done according to the present invention, in the form at present preferred,-by using a soft sheet and wetting it well with ink solution and then retarding the transference of inkfrom the reverse side 11 by applying thereto ametallic powder which will tend to partially choke. the pores of the paper and regulate the quantity of ink solution which is transferred to an underly;- ing writing sheet when the transfer device is pressed in contact therewith. It hasbeen found in practice that a fairly light dusting 14 of aluminum or bronze powder sufilces .for the purposes. However, the quantity, of metallic powder applied to the reverse side ll depends upon the viscosity of the ink and the quantity of ink it is desired to transfer to a writing sheet at each impression.

It has been found that a transfer device made as above described gives service for a long time in relation to other transfer devices heretofore made, besides maintaining substantially the'same Fig. 3 is a similar view but diagrammatically legibility throughout its use. It has been found that when some portions of the transfer device are used more than others, the used portions become reinked due to the fact that the ink solution in the unused portion distributes itself throughout the used portions. This it is believed results from the capillary nature of the sheet employed.

The transfer device of the present invention might be in the form of a rectangular sheet 15 such as is illustrated in Fig. 7, or it may be in theformof a disk 16 illustrated in Fig. 6, said disk being intended for use with a manifolding device such as is described in my copending application, Serial No. 410,477, filed November 20, 1929 now Patent Number 1,958,688, May 15, 1934. For this purpose the disk 16 has a bearing hole 17 and a marginal portion 18 concentric with the hole 17. In the form shown the marginal portion forms a complete annulus, but in some uses it could form only a part of a circle.

This disk is held between writing sheets so that its marginal portion is in the line of writing of a typewriter and it is so mounted that the disk may roll in the line of writing as the typewriting operations progress from one side of the sheet to the other. When so used it is particularly advantageous to have the sheet of which the disk is formed provided with a coating 14 of metallic powder for this reduces the friction between the disk and the writing sheets, and permits the disk to freely roll while in contact with the superposed writing sheets. For the same reason it is in some cases preferable to have a coating 19 of metallic powder on the obverse side of the sheet as shown in Fig. 5. When made in the form of a disk for use in connection with my manifolding device disclosed in my copending application aforesaid, the ability of the sheet to distribute the ink solution within itself becomes extremely important for in such cases only a marginal portion of the disk receives the type impressions and ink in the central portion of the disk may flow outwardly to the used marginal portion to recondition it, and cause it to continue to produce legible impressions. Moreover, the coating of pyroxylin on the soft paper disk stifiens the latter so that it will have good tractive engagement with the under and overlying worksheets.

While other forms of coatings may be employed the pyroxylin lacquer 13 is flexible and may be applied as a very thin coat so as not to unduly increase the thickness of the transfer sheet or make it so stiff that it would not properly impart impressions to the writing sheet underlying the transfer device.

Variations and modifications may be made within the scope of this invention, and portions of the improvements may be used without others.

Having thus described the invention what I claim as new and for which I desire to obtain Letters Patent, is:

1. A transfer device comprising a piece of unsized paper impregnated with an oil and pigment ink solution, and having on the obverse side of the paper a pyroxylin and metallic powder coating for rendering the device non-transferring when said obverse side is pressed into contact with another medium.

2. A transfer device comprising a piece of unsized paper impregnated with an oil and pigment ink solution, having on the obverse side of the paper means for rendering the device non-trans- .ferring when said obverse side is pressed into contact with another medium, and having metallic powder on the reverse side of the paper for retarding the transference of ink solution to a medium pressed into contact with said reverse side of the paper.

3. A transfer device comprising a piece of unsized paper impregnated with an oil and pigment ink solution, having on the obverse side of the paper means for rendering the device non-transferring when said obverse side is pressed into contact with another medium, and having aluminum powder on the reverse side of the paper for retarding the transference of ink solution to a medium pressed into contact with said reverse side of the paper.

4. A transfer device comprising a piece of unsized paper impregnated with an oil and pigment ink solution, having on the obverse side of the paper means for rendering the device non-transferring when said obverse side is pressed into contact with another medium, and having bronze powder on the reverse side of the paper for retarding the transference of ink solution to a medium pressed into contact with said reverse side of the paper.

5. A-transfer device comprising a piece of paper impregnated with an oil and pigment ink and having on one side metallic powder for retarding the transference of the ink solution to a medium pressed into contact therewith.

6. A transfer device comprising a piece of paper impregnated with an oil and pigment ink and having on one side aluminum powder for retarding the transference of the ink solution to a medium pressed into contact therewith.

'1. A transfer device comprising a piece of paper impregnated with an oil and pigment ink and having on one side bronze powder for retarding the transference of the ink solution to medium pressed into contact therewith.

8. A transfer device comprising a piece of paper having a hole forming a bearing and a marginal portion concentric with the hole, said piece of paper being adapted to roll on said bearing between writing sheets in the line of writing of a typewriting machine and being impregnated with an oil and pigment solution; and metallic powder applied to the reverse side of the paper for retarding the transference of ink solution to the writing sheet lying against said reverse side of the transfer device.

LOUIS C. ANTRIM.

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