US2790382A

US2790382A - Stencils for duplicating machines

Info

Publication number: US2790382A
Application number: US380267A
Authority: US
Inventors: Parslow Archibald Joseph
Original assignee: NRG Manufacturing Ltd
Current assignee: NRG Manufacturing Ltd
Priority date: 1952-09-18
Filing date: 1953-09-15
Publication date: 1957-04-30
Anticipated expiration: 1974-04-30
Also published as: GB722374A

Description

April 3o, 1957 A. J. PARsLow s'rENcILs Foa DUPLICATING MACHINES Filed Sept. 15, 1953 l Ivre v'ra STENCILS FOR DUPLICATING MACHINES Archibald Joseph Parslow, Grange Park, England, as-

signor to Gestetner Limited, London, England, a British company Application September 15, 1953, Serial No. 380,267

Claims priority, application Great Britain September 18, 1952 2 Claims. (Cl. lill-128.2)

This invention relates to stencils for duplicating machines.

Stencils for duplicating machines are normally provided with a backing sheet which protects the stencil sheet before use and when cutting and which is removed when the stencil is put on the duplicating machine.

The object `of this invention is to permit duplication of the information on the stencil in stages.

Another object is to enable 'a single stencil to reproduce two sets of copies of which both sets have certain infomation -in common and one set has information additional to the vother set.

A further object is to enable a single stencil bearing certain infomation to be used for reproducing two sets of copies bearing different information.

Yet a further object of this invention -is the provision of a stencil hearing information in columns which permits certain of the co-lumns only to be reproduced on one set of copies and all of the columns to be subsequently reproduced on another set of copies.

A practical application of the present invention will now be described, by way of example only, with reference to the accompanying drawings of which:

Figure 1 is a plan view of a stencil in accordance with the present invention looking on to the stencil sheet,

Figure 2 diagrammatically illustrates how the stencil 'of Figure l is used, and

Figures 3 is a view corresponding to Figure 1 showing an alternative construction of stencil in accordance with the present invention.

Referring to Figure l: the stencil comprises a stencil sheet 5 rand a backing sheet 6. The stencil sheet 5 is secured to the head 7 of the backing sheet in any wellknown and convenient manner and the head 7 is adapted for attachment to the duplicating machine, for instance, it has holes 8 to engage pins on the machine.

The stencil sheet 5 is divided by a vertical, perforated line 9 (i. e. parallel with the long edge of the sheet) into two portions, which are generally indicated at 10 and 11. The portion 10 carries headings, as at 12, and is divided into columns, as at 13. Similarly, the portion 11 carries headings, as at 14, and is Idivided into columns, as at 15.

The backing sheet, las is customary, is horizontally divided from head 7 by a perforated line 16 so that the backing sheet may be removed from the head. Additionally, the backing sheet is divided into

portions

17, 18 by a perforated vertical l-ine 19 and it will be noted in Figure 2 that the perforations 9 and 19 are slightly offset across the width Iof the stencil for a purpose which will later be described. The portions 17 fand 18 yof the backing sheet correspond with the

portions

10 and 11 respectively of the stencil sheet. ai

In use: the stencil is mounted on the duplicatingiachine (which is generally indicated in Figure 2 by the reference numeral 20) and thereafter the portion 17 of the backing sheet is removed by tearing along the perforations 16 and 19, for instance by holding the portion 17 as shown in Figure 2 and rotating the handle 21 of the Patented Apr. 30, 1957 ICC duplicating machine in the direction of the arrow a. Copies are then printed bearing only the informaion on the portion 10 of the stencil sheet 5, the portion 11 of the stenc-il sheet being covered by the portion 18 of the backing sheet so that this information is not reproduced. After a sutlicient number of copies has been run ofi, the portion 18 of the backing sheet is removed and the required number of copies bearing the linformation on the entire stencil sheet is then run off. When -using the copies so obtained, the copies with the information of the portion 10 only are sent externally :of the organisation for which the copies lare prepared, whereas the copies bearing this infomation and the additional information `of lthe portion 1 1 are retained for use internally of the organisation.

Figure 3 illustrates a modified construction of stencil wherein the backing sheet is divided by a plurality of vertical lines of perforations 22 int-o a number of separiately removable portions. It will be evident that the backing sheet may be provided with both horizontal and Vertical lines of perforations, if so desired, i. e. the lines of perforations are parallel with both adjacent edges of rthe sheet.

The perforated line 9 will separate the information of portion 10 from that of portion 11 in t-he copies containing all the information of the stencil and also defines the extent of the last column of portion 10 in the copies containing only the information of the latter portion. By loffsetting perforations 9 and 19 as shown in Figure 2 -it is ensured that the perforated line 9 is reproduced on both sets of copies. Additionally, when producing the copies with restricted information ink penetrating line 9 does not pass on tothe edge of portion 18 and smudge the cop-ies.

l claiin:

l. A stencil for use in a duplicating machine comprising a heading by which the stencil is attached to the machine, a stencil sheet permanently secured to the heading and a backing sheet removably secured to the heading, the backing sheet being o-f substantially the same dimensions as the stencil sheet and being sub-divided into at least two removable parts by a line of perforations eX- tending between the heading and the backing sheet and at least another line of perforations exten-ding fully across from one short edge of the backing sheet to another short edge and parallel to a long edge of the backing sheet.

2. A stencil for use in a duplicating machine comprising a heading by which the stencil is attached to the machine, a stencil sheet permanently secured to the heading and a backing sheet removably secured to the heading, the backing sheet being sub-divided into at least two removable parts by a line of perforations extending between the heading and the backing sheet and at least another line of perforations extending fully across from one short edge -of the backing sheet to another short edge and parallel to a l'ong edge of the backing sheet, and a line of perforations on said stencil sheet parallel to said other line of perforations on the backing sheet but odset therefrom.

References Cited in the tile of this patent UNITED STATES PATENTS 1,532,834 Rand Apr. 7, 1925 2,176,187 Perry Oct. 17, 1939 2,176,771 Nachman Oct. 17, 1939 2,220,244 Jagger Nov. 5, 1940 2,220,265 Morrison Nov. 5, 1940 FOREIGN PATENTS 59,182 Switzerland Dec. 17, 1912 340,935 Italy June 2, 1936 748,367 France Apr. 10, 1933 830,499 France May 19, 1938