US3570397A - Stencil duplicators - Google Patents

Stencil duplicators Download PDF

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Publication number
US3570397A
US3570397A US757559A US3570397DA US3570397A US 3570397 A US3570397 A US 3570397A US 757559 A US757559 A US 757559A US 3570397D A US3570397D A US 3570397DA US 3570397 A US3570397 A US 3570397A
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US
United States
Prior art keywords
stencil
duplicator
cylinder
axis
cylindrical surface
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US757559A
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English (en)
Inventor
Leonard Walter Styles
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NRG Manufacturing Ltd
Original Assignee
NRG Manufacturing Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NRG Manufacturing Ltd filed Critical NRG Manufacturing Ltd
Application granted granted Critical
Publication of US3570397A publication Critical patent/US3570397A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41L—APPARATUS OR DEVICES FOR MANIFOLDING, DUPLICATING OR PRINTING FOR OFFICE OR OTHER COMMERCIAL PURPOSES; ADDRESSING MACHINES OR LIKE SERIES-PRINTING MACHINES
    • B41L13/00—Stencilling apparatus for office or other commercial use
    • B41L13/04—Stencilling apparatus for office or other commercial use with curved or rotary stencil carriers
    • B41L13/08—Stencilling apparatus for office or other commercial use with curved or rotary stencil carriers with stencil carried by two or more cylinders, e.g. through the intermediary of endless bands
    • B41L13/10—Clips or clamps for securing stencils to stencil carriers

Definitions

  • This invention relates to an improvement for use in stencil duplicators, particularly twin-cylinder stencil duplicators, which enable easy and rapid mounting of a stencil on the stenoil carrier of the duplicator.
  • a stencil is fitted to the stencil carrier of a twin-cylinder duplicator by having its heading strip clamped at its top edge to the stencil fixing clamp of the duplicator and then being wiped onto the stencil carrier of the duplicator while the cylinders are rotated slowly by hand.
  • the stencil carrier passes between the top cylinder and the hand of the operator and is thus wiped or pressed into contact with the stencil carrier.
  • a stencil duplicator having a cylinder on which, in use of the duplicator, a stencil is to be laid, wherein a cylindrical surface having its axis parallel to the axis of said cylinder, is positioned on that side of the vertical plane passing through the axis of symmetry of the cylinder at which the surface of the cylinder ascends during normal operation of the duplicator, such cylindrical surface being arranged to be freely rotatable by contact with a stencil passing therearound when the stencil is being laid onto the cylinder so that a stencil being fed onto the cylinder will be partially supported by the cylindrical surface.
  • a further surface is adapted to be positioned in association with said rotatable cylindrical surface so that said further surface lies outside the tangent plane common between the upper part of the surface of said duplicator cylinder and the upper part of said cylindrical surface.
  • said further surface is defined on a downwardly extending rib having its axis parallel to the axes of said rotatable cylindrical surface'and said duplicator cylinder, said downwardly extending rib being formed in a pivotable member of said duplicator.
  • said pivotable member comprises a top cover of the duplicator.
  • said rotatable surface comprises a cylindrical rod freely rotatably mounted in the frame of said duplicator.
  • the apparatus of this invention enables a stencil to be laid on the stencil carrier while the duplicator is being rotatedunder its own power rather than being rotated by hand.
  • FIG. 1 is a somewhat schematic side view of a stencil duplicator incorporating the stencillaying apparatus of the in- 'vention, the duplicator top cover being shown in section;
  • FIG. 2 is a view, similar to FIG. 1, but showing the duplicator top cover in its closed position and a stencil and backing sheet being fed on the stencil carrier.
  • FIG. 1 shows a stencil and backing sheet 1 clamped on studs 2 of a stencil fixing bar 3 and held in position on the studs by the spring biased flap 4 of the stencil fixing clamp.
  • a stencil laying bar 5 comprises a rotatably mounted cylindrical bar journaled in bearing mountings formed in the frame of the duplicator. The stencil and backing sheet 3 are allowed to rest on the laying bar 5,
  • the duplicator is provided with a top cover 6 comprising an end or handle portion 7 and a straight rib 8 formed in the under surface thereof and having a lower convex face 8a.
  • the main body of the top cover 6 is secured by means of screws to a hinge portion 9 pivoted at 10 to the main frame of the duplicator.
  • the rib 8 is so positioned and shaped that when the top cover 6 is closed the surface 8a of the rib lies below the tangent plane common to the upper part of the surface of the cylinder 11 and the upper part of the surface of the stencil laying bar 5.
  • the particular positioning of the rib 8 and the stencil laying bar 5 serves two purposes, namely to prevent the backing sheet from flying up out of contact with the stencil while passing over the laying bar 5, and also to provide a tortuous path for the stencil and backing sheet which has the result that the rigidity of the backing sheet, in tending to resist passage round the sharp bends created by the presence of the rib 8 and bar 5, induces tension in the run of the stencil and backing sheet between the fixing bar 3 and the rib 8. This is most important during the initial laying of the stencil since once the leading part of the stencil has been properly and smoothly applied the final few inches of the leading end of the stencil fall properly in place against the sticky ink covered stencil carrier after the trailing end has passed the laying bar 5.
  • the combined effect of the holding down of the backing sheet and also of the induction of tension in the stencil being laid is that the stencil is urged on to the surface of the stencil carrier under tension and is smoothed down" by the effect of the tension in the backing sheet.
  • the conventional method of laying the stencil on the stencil carrier requires manual smoothing of the stencil on to the carrier by the operator.
  • the duplicator top cover 6 When laying a fresh stencil on the stencil carrier the duplicator top cover 6 is pivoted to the open position illustrated in FIG. 1, the cut stencil and backing sheet are laid over thelaying bar 5 and the stencil heading is brought up to and placed in clamping relation with the stencil fixing bar 3 in such a manner that the stencil is in contact with the laying bar 5 and the backing sheet is uppermost.
  • the duplicator top cover 6 is then moved to its closed position, illustrated in FIG. 2, after which the proofing lever (not illustrated) i operated and the duplicator rotated under its own power far'one cycle to lay the stencil on the cylinder and, if desired, two or more further cycles for producing a proof copy on the backing sheet.
  • the proofing lever is then moved to its inoperative position and the top cover 6 raised in order to facilitate removal of the backing sheet from the stencil heading, the stencil itself now being in close contact with the stencil carrier. If the duplicator has come to rest with the stencil fixing clamp in an inaccessible position, then the duplicator should be rotated until the fixing clamp is accessible and the backing sheet can be removed from the stencil heading by tearing along on the perforated line. It then only remains to return the top cover 6 to its closed position and the duplicator is ready for use.
  • the top cover 6 may be left in the closed position or in the open position during the operation of the stencil duplicator, but clearly from the point of view of cleanliness, safety of operation, and noise suppression, it is advisable to run the duplicator with the top cover closed at all times.
  • the procedure for laying an inked stencil is therefore as follows.
  • the top cover 6 is moved to its open position, the inked stencil is placed over the laying bar 5 and the heading clamped onto the stencil fixing bar 3 such that the printing on the stencil reads correctly when viewed from below.
  • the weight of the part of the limp stencil hanging from the laying bar 5 serves to maintain the run of the stencil 11 under sufficient tension to permit the stencil to be laid smoothly on the stencil carrier. Thus less tension is required with the limp stencil than with the combined assembly of stencil and backing sheet.
  • a stencil duplicator including:
  • a cylinder carried by said frame for normal rotation in a given direction and having a curved surface on which in use of the duplicator, a stencil is to be laid;
  • a freely rotatable member carried by said frame in spaced relation with respect to said cylinder and defining a cylindrical surface having an axis which is parallel to the axis of said cylinder, said axis of the said cylinder surface bei n laterally spaced from that side of the cylinder at whic the said curved surface is rising during rotation of the cylinder in said given direction;
  • movable means carrying said surface defining means for moving said surface defining means between an out of the way position and an operative position intermediate, and below the tangent plane common to, the upper part of the said curved surface and the upper part of said cylindrical surface, whereby a stencil and backing sheet being fed onto the said curved surface of said cylinder may pass between said cylindrical surface and said further surface means with the said stencil in contact with said cylindrical surface to cause rotation of said cylindrical surface by frictional contact therewith during feeding onto said curved surface and with said backing sheet in contact with said further surface means.
  • said further surface means comprises a pivotable member of the duplicator, having a rib extending downwardly therefrom and incorporating said further surface, said rib extending parallel to the axis of said cylindrical surface.

Landscapes

  • Printing Plates And Materials Therefor (AREA)
  • Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Rotary Presses (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
US757559A 1967-10-13 1968-09-05 Stencil duplicators Expired - Lifetime US3570397A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB46850/67A GB1185100A (en) 1967-10-13 1967-10-13 Improvements relating to Stencil Duplicates

Publications (1)

Publication Number Publication Date
US3570397A true US3570397A (en) 1971-03-16

Family

ID=10442820

Family Applications (1)

Application Number Title Priority Date Filing Date
US757559A Expired - Lifetime US3570397A (en) 1967-10-13 1968-09-05 Stencil duplicators

Country Status (6)

Country Link
US (1) US3570397A (xx)
DE (1) DE1801186C3 (xx)
DK (1) DK121304B (xx)
FR (1) FR1603391A (xx)
GB (1) GB1185100A (xx)
YU (1) YU31996B (xx)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3996853A (en) * 1974-06-11 1976-12-14 Gestetner Limited Stencil loading device
US4044670A (en) * 1973-09-14 1977-08-30 Gestetner Limited Stencil duplicator
US4044672A (en) * 1974-08-05 1977-08-30 Zeuthen & Aagaard A/S Printing machine, in particular an office offset machine with means for pre-curving the master

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1560153A (en) * 1977-04-29 1980-01-30 Gestetner Ltd Stencil loading devices for stencil duplicators

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US887063A (en) * 1908-05-12 Mcion James Douglas Carter Rotary-duplicators.
US1556976A (en) * 1925-03-09 1925-10-13 Imp Printing & Finishing Co Fabric-printing machine
CH178824A (de) * 1934-10-15 1935-08-15 Euring Felix Schablonen-Aufspannvorrichtung an Rotationsschablonendruckern.
GB642874A (en) * 1948-09-29 1950-09-13 Gestetner Ltd Improvements in and relating to stencil duplicating machines
US3229624A (en) * 1961-10-26 1966-01-18 Libbey Owens Ford Glass Co Marking apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US887063A (en) * 1908-05-12 Mcion James Douglas Carter Rotary-duplicators.
US1556976A (en) * 1925-03-09 1925-10-13 Imp Printing & Finishing Co Fabric-printing machine
CH178824A (de) * 1934-10-15 1935-08-15 Euring Felix Schablonen-Aufspannvorrichtung an Rotationsschablonendruckern.
GB642874A (en) * 1948-09-29 1950-09-13 Gestetner Ltd Improvements in and relating to stencil duplicating machines
US3229624A (en) * 1961-10-26 1966-01-18 Libbey Owens Ford Glass Co Marking apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4044670A (en) * 1973-09-14 1977-08-30 Gestetner Limited Stencil duplicator
US3996853A (en) * 1974-06-11 1976-12-14 Gestetner Limited Stencil loading device
US4044672A (en) * 1974-08-05 1977-08-30 Zeuthen & Aagaard A/S Printing machine, in particular an office offset machine with means for pre-curving the master

Also Published As

Publication number Publication date
DK121304B (da) 1971-10-04
GB1185100A (en) 1970-03-18
DK121304C (xx) 1975-12-29
DE1801186B2 (de) 1974-03-21
DE1801186C3 (de) 1974-10-31
DE1801186A1 (de) 1969-05-08
YU31996B (en) 1974-02-28
FR1603391A (xx) 1971-04-13
YU235068A (en) 1973-08-31

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