GB2260182A - Rotary drum for a paper transferring mechanism of an offset printing machine - Google Patents
Rotary drum for a paper transferring mechanism of an offset printing machine Download PDFInfo
- Publication number
- GB2260182A GB2260182A GB9121125A GB9121125A GB2260182A GB 2260182 A GB2260182 A GB 2260182A GB 9121125 A GB9121125 A GB 9121125A GB 9121125 A GB9121125 A GB 9121125A GB 2260182 A GB2260182 A GB 2260182A
- Authority
- GB
- United Kingdom
- Prior art keywords
- shell plate
- rotary drum
- impression cylinder
- fabric sheet
- paper
- 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.)
- Granted
Links
- 238000007645 offset printing Methods 0.000 title claims description 11
- 239000002759 woven fabric Substances 0.000 claims abstract description 4
- 239000004744 fabric Substances 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 3
- 210000005069 ears Anatomy 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
- B65H29/02—Delivering or advancing articles from machines; Advancing articles to or into piles by mechanical grippers engaging the leading edge only of the articles
- B65H29/04—Delivering or advancing articles from machines; Advancing articles to or into piles by mechanical grippers engaging the leading edge only of the articles the grippers being carried by endless chains or bands
- B65H29/041—Delivering or advancing articles from machines; Advancing articles to or into piles by mechanical grippers engaging the leading edge only of the articles the grippers being carried by endless chains or bands and introducing into a pile
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F21/00—Devices for conveying sheets through printing apparatus or machines
- B41F21/08—Combinations of endless conveyors and grippers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
- B65H29/02—Delivering or advancing articles from machines; Advancing articles to or into piles by mechanical grippers engaging the leading edge only of the articles
- B65H29/04—Delivering or advancing articles from machines; Advancing articles to or into piles by mechanical grippers engaging the leading edge only of the articles the grippers being carried by endless chains or bands
- B65H29/042—Intermediate conveyors, e.g. transferring devices
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
Abstract
The drum cooperates with an impression cylinder (4, Fig. 1) to transfer a shoot of printed paper (8) from the cylinder and includes a rotary shaft 30 and a pair of end plates 20 spacedly secured on the shaft. Each of the plates 20 has a sectoral cut-out 21, a central opening to receive the shaft 30 and an arc-shaped periphery. A curved shell plate 40 has an inner surface 41 secured to the end plates 20, a discontinuation aligned with the cut-out 21, two circumferential margins and two axially extending margins disposed adjacent to the discontinuation. A screen-like woven fabric sheet 60 covers an outer surface of the plate 40. The sheet 60 is stretched tensely in an axial direction of the plate 40 and is elastic in directions parallel to the circumferential margins by virtue of elongated pleats. The sheet 60 is movable relative to the outer surface of the plate 40 and contacts a printed surface of the printed paper (8) when the paper is moved between the impression cylinder (4) and the drum. <IMAGE>
Description
ROTARY DRUM FOR A PAPER TRANSFERRING MECHANISM
OF AN OFFSET PRINTING MACHINE
The invention relates to a paper transferring mechanism of an offset printing machine, and more particularly to a paper transferring mechanism with an improved rotary drum.
Referring to Figure 1, a conventional offset printing machining is shown to comprise: a machine frame (1), a first plate cylinder (2), a first blanket
cylinder (3), an impression cylinder (4), a second plate cylinder (2a), a second blanket cylinder (3a), a paper transferring mechanism (5), a chain assembly (6), and a receiving bin (7).
An automatic paper feeder (not shown ) feeds a sheet of paper (8) to the impression cylinder (4). The image to be printed is formed on the first and second plate cylinders, (2) and (2a), and is transferred to the first and second blanket cylinders, (3) and (3a). The impression cylinder (4) presses the paper (8) against the blanket cylinders, (3) and (3a), to print the image on the paper (8). The paper transferring mechanism (5) supports the printed paper (8) and transfers the same to claws (6a) on the chain assembly (6). The printed paper (8) is then collected in the receiving bin (7).
Referring to Figure 2, a rotary drum of the conventional paper transferring mechanism (5) is shown to comprise three C-shaped support plates (5b) and three mounting seats (5a) which mount the support plates (5b) onto a rotary shaft (9). The periphery of the plates (5b) should support the paper (8) only at the blank portions of the latter. This is necessary so as to prevent the plates (5b) from scraping against the printed surface of the paper (8). Thus, the positions of the plates (5b) on the axle (9) should be adjusted to correspond with the blank portions of a new image to be printed so that the plates (5b) can properly support
the paper (8) while avoiding damage to the printings thereon.
The drawbacks of using the above disclosed conventional paper transferring mechanism (5) are as follows:
1. Actual experience shows that at least one hour is required to properly adjust the positions of the plates (5b) on the axle (9). Furthermore, several trial prints should be done before one can accurately determine whether or not the plates (5b) are already in their
proper, positions. This decreases the efficiency of material use of the conventional offset printing machine.
2. The conventional paper transferring mechanism (5) cannot be used if the image to be printed has little or no blank portions (such as in borderless images).
3. There is, available, a paper transferring mechanism which uses air spray to support and transfer paper. Aside from the high equipment and maintenance costs thereof, frequent cleaning must be conducted so as to prevent blockage of the outlet ports of its air tube and eventual damage to its motor.
Therefore, the objective of the present invention is to provide a rotary drum for a paper transferring mechanism which can overcome the above mentioned drawbacks of the prior art.
More specifically, the main objective of the present
invention is to provide a paper transferring mechanism with a rotary drum which does not need to be adjusted whenever the printing of a new image is to be initiated.
Another objective of the present invention is to
provide a paper transferring mechanism with a rotary drum that can be used even when the image to be printed has little or no blank portions.
Yet another objective of the present invention is to provide a paper transferring mechanism with a rotary drum that is simple and relatively inexpensive.
Accordingly, the preferred embodiment of a rotary drum operates cooperatively with an impression cylinder of an offset printing machine to transfer a sheet of printed paper from the impression cylinder and comprises: a rotary shaft; at least two end plates each being provided with a sectoral cut-out, a central opening to receive the rotary shaft, and an arc-shaped periphery; means for spacedly securing the end plates onto the rotary shaft; a shell plate curved around the rotary shaft and having an inner surface contacting and secured to the arc-shaped periphery of the end plates, the shell plate having a discontinuation aligned with the cut-out, the shell plate further having two circumferential margins and two axially extending margins disposed adjacent to the discontinuation; and a screen-like woven fabric sheet covering an outer
surface of the shell plate, the fabric sheet having elongated pleats which extend in the axial direction of the shell plate and four edges being bonded to the axially extending margins and to the circumferential margins of the shell plate, the fabric sheet being
stretched tensely in an axial direction of the shell plate and being elastic in directions parallel to the circumferential margins, the fabric sheet being movable relative to the outer surface of the shell plate and contacting a printed surface of the printed paper when
the printed paper is moved between the impression cylinder and the rotary drum.
Other features and advantages of the present invention will become apparent in the following detailed description of the preferred embodiment with reference to the accompanying drawings, of which:
Figure 1 is a schematic diagram of a conventional offset printing machine;
Figure 2 is a perspective view of a rotary drum of a conventional paper transferring mechanism of the offset printing machine shown in Figure 1;
Figure 3 is a perspective view of the preferred
embodiment of a rotary drum for a paper transferring mechanism according to the present invention; and
Figure 4 is a side view of the rotary drum shown in
Figure 3.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to Figures 3 and 4, the preferred embodiment of a rotary drum for a paper transferring mechanism of an offset printing machine is shown to comprise: a pair of spaced mounting seats (10); a pair of metal end plates (20); a rotary shaft (30); a shell plate (40); a bonding means (50); and a screen-like woven fabric sheet (60).
The mounting seats (10) are similar in construction to the mounting seats (5a) shown in Figure 2. Each of the mounting seats (10) includes upper and lower arched halves,, (11) and (15). An upright ear (12) is formed on each end of the upper arched half (11). Each ear (12) has an axial through hole (13). The upper arched half (11) is further provided with a radial inward projection (14). The lower arched half (15) is provided
with a pair of ears (151) which are aligned with the ears (12) of the upper arched half (11). Each ear (151) has an axial threaded opening (16). Bol-ts (17) are provided to fasten the upper and lower arched halves, (11) and (15), at the ears, (12) and (151). The upper and lower arched halves, (11) and (15), cooperatively form an annular seat which defines a central opening to
receive the rotary shaft (30).The rotary shaft (30) has an axially extending groove (see Figure 2) to receive the inward projection (14) and prevent rotation of the mounting seats (10) relative to the same. The mounting seats (10) are spaced along the length of the
rotary shaft (30). The periphery of the lower arched half (15) is further provided with three screw socket projections (19).
Each of the end plates (20) has an arc-shaped periphery and is provided with a sectoral cut-out (21) and a central opening to receive the rotary shaft 30.
Each of the end plates (20) are further-provided with three through holes (not shown) disposed adjacent to the periphery surrounding the central opening thereof.
Screws (25) extend through the through holes of the end
plates (20) and engage the screw socket projections (19) to fasten the end plates (20) to the mounting seats (10).
The characterizing features of the present invention are as follows: The inner surface (41) of the shell
plate (40) is secured to the arc-shaped periphery of the end plates (20). The shell plate (40) further has a discontinuation aligned with the sectoral cut-outs (21). The shell plate (40) may be made of any rigid or semi-rigid material, such as rust-proofed metal, iron, wood, rubber, etc.
The fabric sheet (60) covers the outer surface of
the shell plate (40). The bonding means (50) is provided on two axially extending margins and on two circumferential margins of the inner surface (41) of the shell plate (40) so as to secure the fabric sheet (60) onto the shell plate (40). The bonding means (50)
may be glue, double-sided adhesive, or VELCRO1hook and loop fasteners. In the preferred embodiment, VELCRO
hook and loop fasteners (50) are provided on the inner surface (41) of the shell plate (40) and on the four edges of the inner surface of the fabric sheet (60).
The fabric sheet (60) is provided with elongated pleats which extend in the axial direction of the shell plate (40). Thus, the fabric sheet (60) is stretched tensely in the axial direction of the shell plate (40), but is elastic in directions parallel to the circumferential margins of the shell plate (40).
The printed surface of a sheet of printed paper from the impression cylinder contacts the fabric sheet (60) when the preferred embodiment is in use (Refer to
Figure 1). No relative movement exists between the
printed paper and the fabric sheet (60) in order to eliminate smearing of the printed paper. However, limited movement of the fabric sheet (60) relative to the shell plate (40) is possible since the fabric sheet
(60) is elastic in directions parallel to the circumferential margins of the shell plate (40). The fabric sheet (60) thus serves as a buffer which permits the movement of the printed paper relative to the shell plate (40) without producing a rubbing action that will cause the printed surface of the paper to smear. The shell plate (40) rotates with the rotary shaft (30) so as to transfer the paper to the next operation.The elongated pleats of the fabric sheet (60) prevent the stretching of the fabric sheet (60) in the axial direction of the shell plate (40) in order to stabilize the movement of the printed paper relative to the shell plate (40).
To assemble the preferred embodiment, the shell plate (40) is first secured to the arc-shaped periphery of the end plates (20). The lower arched halves (15) are then mounted on the end plates (20). The end plates (20) are then fitted onto the rotary shaft (30), and the upper arched halves (11) are attached to the lower arched halves (15). The bonding means (50) is provided on the inner surface (41) of the shell plate (40).
Finally, the fabric sheet (60) is attached to the shell plate (40) to cover the outer surface of the shell plate (40).
The advantages of using the paper transferring mechanism of the present invention are as follows:
1. The preferred embodiment does not require an adjustment procedure each time a new image is to be printed.
2. The preferred embodiment can be used even when
the image to be printed has little or no blank portions.
3. The preferred embodiment is simple in construction and is thus, relatively inexpensive.
Claims (4)
1. A rotary drum operating cooperatively with an impression cylinder of an offset printing machine to transfer a sheet of printed paper from the impression cylinder, comprising:
a rotary shaft;
at least two end plates each being provided with a sectoral cut-out, a central opening to receive said rotary shaft, and an arc-shaped periphery;
means for spacedly securing said end plates onto said rotary shaft;
a shell plate curved around said rotary shaft and having an inner surface contacting and secured to said arc-shaped periphery of said end plates, said shell plate having a discontinuation aligned with said cutout, said shell plate further having two circumferential margins and two axially extending margins disposed adjacent to said discontinuation; and
a screen-like woven fabric sheet covering an outer surface' of said shell plate, said fabric sheet having four edges being bonded to said axially extending margins and said circumferential margins of said shell plate, said fabric sheet being stretched tensely in an axial direction of said shell plate and being elastic in directions parallel to said circumferential margins, said fabric sheet being movable relative to the outer surface of said shell plate and contacting a printed surface of said printed paper when said printed paper is moved between said impression cylinder and said rotary drum.
2. The rotary drum as claimed in claim 1, wherein said
fabric sheet is formed with elongated pleats which extend in the axial direction of said shell plate.
3. The rotary drum as substantially described hereinbefore with reference to Figures 3 and 4.
4. A rotary drum for cooperation with an impression cylinder in an offset printing machine for transferring a sheet of printed material from the impression cylinder, said drum having an outer covering which is mounted on a support therefor but movable relative thereto.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9121125A GB2260182B (en) | 1991-10-04 | 1991-10-04 | Rotary drum for a paper transferring mechanism of an offset printing machine |
| SG175794A SG175794G (en) | 1991-10-04 | 1994-12-16 | Rotary drum for a paper transferring mechanism of an offset printing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9121125A GB2260182B (en) | 1991-10-04 | 1991-10-04 | Rotary drum for a paper transferring mechanism of an offset printing machine |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9121125D0 GB9121125D0 (en) | 1991-11-13 |
| GB2260182A true GB2260182A (en) | 1993-04-07 |
| GB2260182B GB2260182B (en) | 1994-09-14 |
Family
ID=10702433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9121125A Expired - Fee Related GB2260182B (en) | 1991-10-04 | 1991-10-04 | Rotary drum for a paper transferring mechanism of an offset printing machine |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2260182B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997032805A1 (en) * | 1996-03-05 | 1997-09-12 | Minnesota Mining And Manufacturing Company | Readily replaceable roll covers |
| US5908680A (en) * | 1996-03-05 | 1999-06-01 | Minnesota Mining And Manufacturing Company | Replaceable roll covers with repositionable pressure sensitive adhesive |
| WO2005102887A3 (en) * | 2004-04-22 | 2006-04-06 | Kba Giori Sa | Delivery unit for sheet-fed printing or processing machines |
| WO2017129702A1 (en) | 2016-01-27 | 2017-08-03 | Bricq | Device comprising a feed roll and a self-adhesive fastener, and associated method and machine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1118447A (en) * | 1964-11-10 | 1968-07-03 | Grace W R & Co | Improvements relating to rolls |
| GB1142643A (en) * | 1965-02-25 | 1969-02-12 | Kuesters Eduard | Improvements in impression cylinders of rotogravure printing machines |
| GB1251126A (en) * | 1968-01-24 | 1971-10-27 | ||
| GB1569328A (en) * | 1976-09-09 | 1980-06-11 | Hostert Automata | Photographic processing machine |
| US4883715A (en) * | 1985-02-28 | 1989-11-28 | Canon Kabushiki Kaisha | Elastic rotatable member |
-
1991
- 1991-10-04 GB GB9121125A patent/GB2260182B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1118447A (en) * | 1964-11-10 | 1968-07-03 | Grace W R & Co | Improvements relating to rolls |
| GB1142643A (en) * | 1965-02-25 | 1969-02-12 | Kuesters Eduard | Improvements in impression cylinders of rotogravure printing machines |
| GB1251126A (en) * | 1968-01-24 | 1971-10-27 | ||
| GB1569328A (en) * | 1976-09-09 | 1980-06-11 | Hostert Automata | Photographic processing machine |
| US4883715A (en) * | 1985-02-28 | 1989-11-28 | Canon Kabushiki Kaisha | Elastic rotatable member |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997032805A1 (en) * | 1996-03-05 | 1997-09-12 | Minnesota Mining And Manufacturing Company | Readily replaceable roll covers |
| US5908680A (en) * | 1996-03-05 | 1999-06-01 | Minnesota Mining And Manufacturing Company | Replaceable roll covers with repositionable pressure sensitive adhesive |
| WO2005102887A3 (en) * | 2004-04-22 | 2006-04-06 | Kba Giori Sa | Delivery unit for sheet-fed printing or processing machines |
| EP1990299A3 (en) * | 2004-04-22 | 2009-06-10 | Kba-Giori S.A. | Delivery unit for sheet-fed printing or processing machines |
| WO2017129702A1 (en) | 2016-01-27 | 2017-08-03 | Bricq | Device comprising a feed roll and a self-adhesive fastener, and associated method and machine |
| CN109070520A (en) * | 2016-01-27 | 2018-12-21 | 布利克输送带公司 | Apparatus including a feed roller and self-adhesive fasteners and related methods and machines |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2260182B (en) | 1994-09-14 |
| GB9121125D0 (en) | 1991-11-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19991004 |