US984618A

US984618A - Apparatus for watermarking paper.

Info

Publication number: US984618A
Application number: US42294508A
Authority: US
Inventors: Walter Knowles Trotman
Original assignee: Individual
Current assignee: Individual
Priority date: 1908-03-24
Filing date: 1908-03-24
Publication date: 1911-02-21
Anticipated expiration: 1928-02-21

Description

Patented Feb.21,191'1. s snnn'rskgngg'rk f J i J 2% JVQW dfi v W. K. TROTMAN.

APPARATUS FOR WATBBMARKING PAPER.

- APPLICATION FILED MAR 24, 1908.

1 J fqgi. 1

W. K. TROTMAN. APPARATUS FOR WATERMARKING PAPER,

APPLICATION YILIID MAR. 24, 1908.

Patented Feb. 21, 1911.

2 EHEBTB-BHEST 3.

. \Vatermarking Paper. of which the followv and rings.

v and fiat frames (wove or laid) used for that more removable sections carrying the water? 'bodying the present invention belongs to for watermarking paper comprises the com- -covering at such spaces being soldered.

LUNITED s trnsPAtrENT OFFICE.

- WALTER KNOWLES TROTMAN, OF WOOD GREEN, LONDON, ENGLAND.

' Arman-Ares Fox WATERMARKING PAPER.

Application filed March 24,

To all whom it may concern:

Be itknown that I. 'arxrnn Kxownns 'lno'ratax. a sub ect. of the King of England. residing at \Yood Green, London.

Imgland, have invented certain new and useful Improvements in Apparatus for This invention, relates to improvements in apparatus for watermarking paper. namely. the dandy rolls (wove. laid and spiral-laid) purpose. In my previous United Ftates Patent No. 821-206 I have described a dandy roll the cylindrical portion of wlnch has one or marking device and the apparatus emthesamc type. In the arrangement de scribed in my prior patent. the cylindrical portion of the dandy roll had a space therein and asection of backing carrying a detachable or other gauze covering was arranged to fit. into the space in the backing. but in the present invention the backing (either of a dandy roll or tiat frame) is made in the ordinary waycomplete. comprising forexamplc (in the case of a dandy roll) a shaft carrying a series of rings with longitudinal wires or rods thereon having a spiral backing sheet wound on the rods According to this invention an apparatus' bination with a permanent backing of a gauze covering having one or more removable sections carrying the waternnn'kiug devices. The gauze covering has spaces therein and is permanently attached to the backing and projections and rece ses are provided both on the backing and on the removable gauze sections and are arranged to engage one another so as to retain the sections in position. In constructing a dandy roll in accordance with this invention. the. permanent backing is made up in any usual way. The wire gauze covering having spaces therein is permanently secured to the backing, the circumferential edges of the fused or otherwise secured to the usual rings of the baekingi and positioning devices are provided on the removable gauze sections and on the backing so that the sections can be accurately placed in position in .the spaces Specification of Letters Patent.

therein when in use.

Patented Feb. 21; 1911. 1903. Serial 170,422,945.

in the covering and can be securely held In the accompanying drawings:Figures l to 4 illustrate one method of carrying'this invention into effect on a dandy roll having a laid covering. Fig. 1 is an elevation partly broken away.' Fig. :2 is a tran verse section on the line 22 of Fig;

1: and Figs. 3 and l are enlarged perspec tive views of details. Fig. is. an elevation partly broken away. and Fig. (3 is a transverse section on the line tt of Fig. 5. showing a method of carrying this invention into ettect on a dandy roll having a wove covering.

Referring first to Figs. 1. '2. 3, and 4. the main framework of the roll is constructed as usual and consists of a central shaft A having fixed thereon circular ends platesB and a series of circular open disks C. The wire gauze covering, (in this case a laid covering) is secur d to the disks in any usual way and the covering consists of longitudinalwires l) secured together by tine interlaced wires 'l') constituting the laid wires and secured also to the rings C. space is leftin the wire gauze covering at the place where the removable section is to occur and the cut ends of the wires of the covering are soldered. fused. brazed. sewn or otherwise secured to the rings C of the backing. Alongside the rings 0 to which the cut ends are solder :l are fixed half rings C to serve as supports for the removable gauze section.

The removable gauze section F having the watermarking device thereon terminates at its endsin a twist or stiti'ening wire F. (constituting part of the laid wires in the complete covering. as shown in Fig. 4). Projecting from the longitudinal edges of the removable sectioniF are shortstifi wires G a rranged to be insertedmiderneath the longitudinal edges of the fixed covering. The rings C of the backing and also the halfrings C are provided with a series of little pins ll arranged to project into the edges of the removable section so that the removable section is held in position during use. it will be seen from Fig. 3 that the removable section is prevented from moving out radially by 2 fjf 984,618

section, the distance between the sets of pins being such that the section is held accurately in position so as virtually to form part of the covering as a whole.

The method of applying the removable section is as follows :-The short stifi' wires 1 G at one edge of the removable section are inserted underneath the longitudinal edges of the fixed covering in such a position that the little pins H engage the first longitudinal Wire of the removable section F. The short stifi' wires G at the opposite (or second) longitudinal edge of the removable section are also inserted underneath the corresponding edge of the fixed covering and the removable section is then gently stroked or rubbed so as to cause the longitudinal wire at the second edge to ride over the corresponding pins H and the removable section is then securely held in posi tion. r

In order to detach the removable section for the purpose of substituting a' section having a difierent watermark, it is only necessary to raise the longitudinal wire at one edge of the section off the pins H and then to pull the short stifl' wires G out of engagement 'ith the fixed covering. To

facilitate this, sliding fingers J may be' provided on some of the rings C immediately under one edge of the removable see tion and these sliding fingers may be op- ,e -atcd by eccentrics J on a rotatable longitudinal rod J operated from the end of the dandy roll by a rotatableknob or handle J. a

Referring to Figs. 5 and 6 which illustrate a dandy roll having a wove covering and embodying this invention, the roll comprises a hollow shaft A, end plates B and a series of circular open disks (1.. To the periphery of these disks is attached the cylindrical frame of the roll constructed of longitudinal rods K upon which is wound (preferably spirally) a stout wire L with spaces between the convolutions. This circumfcrential wire L is soldered, sewn, or otherwise secured to the longitudinal rods K. The shaft A,'disks C, rods K and wire L constitute the backing of the dandy roll. Upon this backing is secured a wire gauze sheet M forming the outer surface of the roll. A section of'tlie..\vire gauze covering N carrying the watermarking devices thereon is removable from the roll. In this arrangement the removable section has stiffencrs consisting of little metallic plates 0 at its longitudinal edges. Slots P are then cut in the spiral backing sheet of wire L and also if need be slots Q. may be cut in the rings C near the edges of the spaces in the covering. The stiff edges 0 of the vnovable section are inserted into these slotsa P Q, and secured in position there. In the arrangement illustrated in Figs. 5 and .6, the stiffening plates 0 have slots 0 therein and hooks or snail cams R attached to two rotatable longitudinal rods S having rotatable knobs S at the end of the roll are arranged to enter the slots 0 so that when the removable section N is placed in position with the plates 0 projecting into the slots I O, and when the longitudinal rods S are rotated so as to bring the hooks R into ongageme'nt with the slots 0, the removable section is firmly seemed in position. To replace one removable section by another carrying a different watermark, it is only 8 necessary to turn the hool-z's Root of engagement- With the slots 0 when the removablesection will'be free. Instead of the metal plates 0 stiffened edges of wire or other device may be used. S5

The invention has been described in its application to a dandy roll having a central shaft and disks thereon but the. invention 15 equally applicable to a dandy roll the backing of which is constructed in any other usual manner for example to a dandy roll having a backing consisting of a perforated metal sheet or a backing consisting solely of longitudinal rods and spiral windings.

It is to be understood that the details of arrangement and construction maybe varied without departing from this invention.

ll'hat I claim as my invention and desire to secure by Letters Patent is 1. In an apparatus'for watermarlci 1g pa- 00 per the combination of a complete and permanent backing, a gauze covering permanently secured to said backing and having a space therein, a removable gauze section carrying the watermarking devices and 1 adapted to fit into said space, and projections and recesses on the backing and section to engage one another and retain the section in position.

2. In a dandy roll the combination of a complete and permanent cylindrical backing comprising a shat t and a series of circular disks thereon, a cylindrical gauze covering permanently secured to said backing and having a space therein, a removable gauze section adapted to fit into said space, and projections and recesses on the backing and section arranged to engage one another and retain the section in position.

In a dandy roll the combination of a shaft. a series of circular disks permanently secured thereon, longitudinal rods pcrnianently secured to said disks, a backing sheet formed of wire wound on the rods and permanently secured thereto and having longitudinal slots therein, a wire gauze sheet permanently secured to said backing sheet and having a space therein. a removable section of gauze sheet adapted to fit ins-aid space, s'tifl'cncrs at the longitudinal edges of said section arranged to project into the slots Y sheet M permanently secured to said back- 7 V ing sheet and having a space thereln, areand means for securing the stiffeners to the back ng to retain the section 121 posltlon.

4. In a dandy roll the combination of a shaft A, a series of circular disks C permanently secured thereon and having slots Q, in their circumference, longitudinal rods K permanently secured to said disks, a back-e ing sheet formed of wire L wound on and permanently secured to the rods K and having longitudinal slots P tl1ere1n,a wire gauze movable section of gauze sheet adapted to the siotsiin the sti eners O of the removable 20 gauze section.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

WALTER KNOWLES TROTMAN.

W'itnesses:

\VILLIABE H. BALLANTYNE, HARRY B. BRIDGES.