US1996582A - Gelating pad for duplicators - Google Patents

Description

April 2, 1935. AR EV 7 1,996,582

GELATIN PAD FOR DUPLICATORS Filed March 16, 1932 2 Sheets-Sheet 1 Inciflibr Qffed Marcfwu,

April 935. A. MARCHEV v l,?96,582-

GELA'IIN PAD FOR DUPLICATORS Filed March 16, 1932 2 Sheets-Sheet 2 Patented Apr. 2, 1935 GELATIN PAD FOR nortioa'rons Alfred Marchev, La Grange, 11]., assignor to Ditto, Incorporated, Chicago, 111., a corporation of West Virginia Application March 16, 1932, Serial No. 599,214 g Claims.

: The invention relates generally to improvements in gelatin'pads and the like and more particularly is concerned with the provision of a metal strip having novel means whereby the 5 same may be readily and securely attached to an edge of a pad or band such as are used in hectograph machines.

An object of the invention is to provide a metal strip having a novel construction rendering the same readily attachable to a pad or other similar article as may be desired without the use of special tools and wherein the union effected by reason of the special construction will (be particularly secure and able to withstand'considerable tension.

A further object is to provide a metal-reinforcing strip from a single blank having fastening lugs integral therewith and a formed portion, which latter will co-operate with thearticle to which the strip is attached in a mannerto con siderably increase the efiiciency of the union.

The gelatin pads and bands with which the present invention is particularly concerned are used on duplicators to provide the duplicating surface and it is required that the bands be readily attachable to securing means provided for'the purpose. Openings are also formed in the material of the pads adjacent the end strips for the purpose of increasing their utility by rendering them adaptable to machines of various makes.

It is therefore another object of the invention to provide an improved construction of gelatin pad particularly designed for rotaryduplicators having a novel attaching strip for detach-.- ably securing the ends of the pad to supports and openings therein positioned and arranged to permit means to extend through the pad for facilitating the stripping of the duplicated sheet therefrom.

With these and various other objects in view the invention may consist of certain novel feetures of construction and operation as be more fully described and particularly pointed out in the specification, drawings and claims appended hereto.

In the drawings which illustrate an embodiment of the device and ,wherein like reference characters are used to designate like parts- Figure 1 is a perspective view showing a gelatin pad equipped with end strips constructed in accordance with the present invention;

Figure 2 is a perspective view of the metal strip of the invention showing the fastening lugs formed integral therewith;

Figure 3 is an enlarged cross sectional view taken transversely of the strip between the lugs; Figure 4 is an enlarged cross sectional view showing the strip in attached relation with an end of a gelatin pad.

Figure -5 is an elevational view of a drum such -5 as employed in rotary duplicators, the same being shown equipped with securing means for gelatin pads as described; and

Figure 6 is an end view ofthe drum looking toward the right in Figure 5. 10

The present invention is shown as applied to a gelatin pad Ill such as are used in hectograph machines for providing the duplicating surface, the pad being constructed of a fabric backing I2 having one surface covered with a. layer of 15 gelatin It. Although the advantages derived from the improved construction of metal strip are particularly applicable to gelatin pads such as disclosed the invention is in no manner limited thereto but has a considerably wider range since 2 the same may be employed with equal efficiency 1 as end reinforcements for bands and generally any length of fabric or similar material wherein it is desirable thatstrips of the kind disclosed be secured to its edges. 25

The metal strip is formed from a single blank of metal which is bent along an edge It lon itudinally of the strip forming a portion l8 and a portion 2 of substantially equal width. The portion l8 has a plurality of lugs 22 formed integral 30 therewith, being struck from the metal of the blank, resulting in providing a plurality of apertures 26 in portion I8. In order to materially strengthen this portion and to add to the rigidity of the metal strip as a whole the apertures 24 are 5 so positioned with respect to edge 26 of portion l8 as to leave a strip of metal 28 connecting sections 30 located on the respective sides of the aperture. Connecting the sections 30 in this manner materially increases the holding power of 40 the strip when the same is attached to a gelatin pad since the portion I8 is substantially one piece, whereas, in the event the connecting strips 28 were omitted, it will be appreciated that the portion l8 would comprise a plurality of independent 45 sections 30. v I

.A feature of the present invention, among others, is the special formation given to the portion .20 which is ribbed as at 32 longitudinally of the portion, displacing sections of the portion 50 so that the same lie in different planes forming an angle with each other, the apex of the angle at the rib 32. It will be seen from Figure 3 that by reason of this special formation of portion Zd'the inner surface of the same is 5 provided with a bead 34. For attaching the metal strip as described to an end of the gelatin pad In the same is located between the portions l8 and 20 of the strip and after aligning the same with respect to the band the portions are forced together, functioning as jaws and gripping the material of the pad between them. Preferably portion I8 is forced in a direction toward the portion 20 since this automatically serves to increase the spacing between the lugs 22 and the portion as clearly shown in Figure 4. By the formation of the longitudinal ridge in portion 20 of the strip the longitudinal bead 34 is provided, the same projecting from the surface of the por- .tion and by crimping the strip upon an edge of the pad the inner surfaces of the portions are forced into contact with the surface of the pad with the bead being forced into the material to an extent such that the material is securely united thereby to the strip.

The bead in effect forms a restricted passage serving to concentrate pressure at that point whereby the material engaged is securely held and separation of the parts by the material pulling out from the strip through tension is" prevented since in addition to the holding caused by the material in contact with the bead it is correspondingly difiicult for the material not so engaged to be drawn through the restrictedpassage. Thusthe union eflected between. the strip and material has increased efficiency in respect to the ability of the parts to withstand tension by reason of the special formation given the portion.

Also the metal strip as constructed has utility as a reinforcing end member for pads, bands or other analogous articles and also in providing lugs which may be employed as hooks should it be desired to attach the article to a support. The lugs being struck from the metal of the strip are integral therewith and are well able to withstand the tension placed on them in the stretching generally given the pads in order that they will lie fiat and present a smooth surface. Also the retaining of a section of metal as a connection between sections alternating with the apertures results in materially adding to the strength of the union when the strip is attached to the pad and to the rigidity of the structure as a whole.

Figures 5 and 6 show a drum of a rotary duplicator with a gelatin pad of the construction described above detachably secured thereto. The drum is formed of spaced end members 35 and 37 having an inwardly directed peripheral flange 38 to which is secured the arcuate plate 40 extending from points substantially diametrically opposite each other and providing the support for the gelatin pad. The ends of the plate 40 are bent inwardly as at 4| and 42, respectively, the latter providing an edge over which is located the lugs 22 of the metal strip forming that end of the pad, the body of the same being supported upon the arcuate plate 40 so that the gelatin covering l4 provides the duplicating surface of the drum. The other end of the band lies over the end 4| and is secured to shaft 43 by interlocking the lugs of the end strip with the edge 44 formed integral with and extending the length of the shaft '43. In order that the pad may be held on the plate 40 in stretched condition shaft 43 is rotatable in the end members of the drum and may be rotated by the operator by actuation of the finger piece 45 suitably s ecured to the shaft. The pawl 46 pivoted to end member 36 by stud 41 has engagement with the ratchet 48 mounted on shaft 43 and in connection with the tension spring 50 serves to hold the shaft in rotated position. The operator may readily release the pawl 46 when it is desired to rotate the shaft for the purpose of removing the gelatin pad by grasping the finger piece 5| integral with the pawl.

The gelatin pad shown in Figure 1 in addition to having its ends reinforced by securely attaching thereto the metal strips described is provided with openings 52 arranged in spaced relation at both ends of the pad adjacent to the strips. The openings are necessary in order to permit the deflecting fingers 53 to extend through the material of the pad, it being of course understood that similar openings are provided in the depending end 42 for the same purpose. The shaft 54 journalled in the end members of the drum is resiliently urged by the coil spring 55 in a direction to maintain the fingers secured to the shaft by screws 56 in a retracted position where they lie below the periphery of the drum. During rotation of the drum to perform a duplicating operation the shaft 54 isrocked through lever 51 in a direction to project the fingers 53 above the duplicating surface and since the duplicated sheet has its leading marginal edge located over the fingers the edge is therefore located between the stripping rollers, which function to complete the stripping of the sheet. It will be clear from the foregoing that in order to accommodate the deflecting fingers it is required that the band he provided with openings and with the present construction of pad the same are arranged with respect to the end attaching strips to render the pad reversible and to also permit use of the pads in rotary duplicators of other types.

It is to be understood that I do not wish to be limited by the exact embodiment of the device shown, which is merely by way of illustration and not limitation, as various and other forms of the device will be apparent to those skilled in the art without departing from the spirit of the invention or the scope of the claims.

I claim:

1. A gelatin pad for rotary duplicators having a rotating drum, said pad being applied to the drum for providing the duplicating surface thereof, end members secured to the pad, lugs on the members for effecting securement of the pad to the drum, the pad having openings positioned adjacent the end members for permitting means carried by the drum to project therethrough.

2. A duplicating pad comprising, in combine.- tion: a band of fibrous material; a. gelatinized surface carried by said band; a metallic clip applied to each end of said band; each clip compris-- portion of the clip, impressed into the material.

of the band; hook members struck out from the material of one of the folded portions of the clip for attachment of the pad assembly to a duplicator drum; said pad assembly formed with openings adjacent each clip bearing end for passage therethrough of paper deflecting fingers of a duplicator drum. v

3. A duplicating pad comprising, in combination: a band of fibrous material; a gelatinized surface carried by said band; a metallic clip applied to each end of said band; each clip comprising an integral strip of metal folded upon itself and holding an end of said band clamped between the portions of the fold; a bead formed in one portion of the clip, impressed into the matethrough of paper deflecting fingers of a duplicator drum 4. A duplicating pad comprising, in combination: a. band of fibrous material; a gelatinized surface carried by said band; a metallic clip applied to each end of said ban; each clip comprising an integral strip of metal folded upon itself and holding an end of said band clamped between the portions of the fold; and hook members projecting from one of the folded portions of the clip for attachment of the pad assembly to the duplicator drum; said pad assembly formed with openings adjacent each clip bearing end for passage therethrough of paper deflecting fingers of.

a duplicator drum.

5. A duplicating pad comprising, in combination: a band of fibrous material; a gelatinized surface carried by said band; a metallic reenforcing member applied to each end of said band; each reenforcing member comprising opposed layers of metal clamping the fibrous material between them; and hook members projecting from one of said layers of the reenforcing member for attachment of the pad assembly to a duplicator drum; said pad assembly formed with openings in each reenforcing member for passage therethrough of paper deflecting fingers of a duplicator drum.

ALFRED MARCHEV.

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