EP0890535B1 - Sheet feeder device for the single handling and feeding of stacked sheets - Google Patents
Sheet feeder device for the single handling and feeding of stacked sheets Download PDFInfo
- Publication number
- EP0890535B1 EP0890535B1 EP98202275A EP98202275A EP0890535B1 EP 0890535 B1 EP0890535 B1 EP 0890535B1 EP 98202275 A EP98202275 A EP 98202275A EP 98202275 A EP98202275 A EP 98202275A EP 0890535 B1 EP0890535 B1 EP 0890535B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sheet feeder
- feeder device
- suction
- stack
- elements
- 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
Links
- 230000033001 locomotion Effects 0.000 claims description 10
- 230000009347 mechanical transmission Effects 0.000 claims description 4
- 230000010355 oscillation Effects 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000007664 blowing Methods 0.000 description 3
- 238000011143 downstream manufacturing Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 101100441413 Caenorhabditis elegans cup-15 gene Proteins 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Images
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
- B65H3/00—Separating articles from piles
- B65H3/08—Separating articles from piles using pneumatic force
- B65H3/0808—Suction grippers
- B65H3/0816—Suction grippers separating from the top of pile
- B65H3/0825—Suction grippers separating from the top of pile and acting on the rear part of the articles relatively to the final separating direction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H3/00—Separating articles from piles
- B65H3/36—Separating articles from piles by separators moved in special paths, e.g. enclosing an area
- B65H3/38—Separating articles from piles by separators moved in special paths, e.g. enclosing an area the paths not enclosing an area
Definitions
- This invention refers to a sheet feeder device for the single handling and feeding of stacked sheets.
- the industry processing paper in sheet form such as for instance the plastifying or printing industry, needs to be capable of handling large volumes of sheets.
- These sheets are generally arranged in a stack and associated with the printing machine, the plastifying machine etc., to perform the work required by the particular treating process.
- the sheets must therefore be picked up from the stack one at a time and conveyed to the next processing unit.
- grabbing devices for a single sheet on top of a stack are known and generally designated as sheet feeders.
- These sheet feeder devices are provided with arms which generally pick-up the single sheet by suction grabbing elements to lift it from the stack and shift it for example to a downstream processing or simply receiving unit.
- the arm or arms move the relative suction grabbing devices toward the face of the sheet to be grabbed and transferred, using a vacuum or similar effect.
- Some blowing nozzles are simultaneously activated to favor the detachment of the sheet from the underlying sheets in the stack, to be followed immediately by shifting the grabbed sheet toward the next unit.
- DE-A-1 786 117 discloses a sheet feeder device according to the preamble of claim 1.
- the purpose of the present invention is to achieve a sheet feeder device for the single handling and feeding of stacked sheets capable of overcoming the technical and economic problems generated by the known, particularly complex controlling and moving structure.
- a further purpose is to produce a sheet feeder device for the single handling and feeding of stacked sheets, capable of handling them without error, with an absolutely uniform action of grabbing a single sheet from the stack and performing a fixed stroke, and also capable of operating at high speeds.
- An alternative embodiment also provides for a further set of suction elements which are rigidly connected to said supporting structure and cooperate with said at least one set of oscillating suction elements.
- Said first recessed cam assembly preferably includes an idle roller rigidly connected to said oscillating arm which fits into a cam-shaped recess carved out in a plate pulled into a rotating motion by the said positive mechanical transmission.
- Such a device is particularly simple, non-vibrating and also capable of operating at high speeds.
- a sheet feeder device for the single handling and feeding of stacked sheets built according to the invention is shown and designated as a whole by the numeral 11.
- This device 11 comprises a box-like supporting structure 12 holding two groups of grabbing elements which act on the upper face of a sheet 13 to be picked up and transferred, placed at the top of a stack of sheets 14.
- These grabbing elements generally comprise suction elements 15 and 16 performing this function by a vacuum or similar principle.
- Some internal telescopic suction-cups are held in a housing 17 and activated to emerge from the same when a vacuum is created in the interior. Once these suction cups reach the sheet 13, the sheet grabbing motion is performed and the suction cups are simultaneously lifted.
- a first set of grabbing elements comprises two suction elements 15 which are rigidly connected to the vertical shoulders 18 of the supporting structure 12.
- the second set of grabbing elements comprises the suction elements 16 rigidly connected to the two rods 19 and carried by an arm 20 oscillating between at least one pair of extreme positions.
- the second set of suction elements 16 can in fact oscillate between a grabbing position on top of the stack 14 and a releasing position of the single sheet 13, moved forward toward a next sheet processing or simply receiving unit.
- Both the suction elements 15 and the suction elements 16 can be fitted with blowing nozzles 21 actuated to favor the detachment of the sheet 13 from the underlying sheets of the stack 14 during the picking-up process. Provision is also made for a cross beam 40 which supports some adjusting elements 41 set vertically before the stack 14.
- the arm 20 is shaped to resemble an upturned U, hinged at the bottom of the U, placed at its top end, by shafts 22 to the shoulders 18 and oscillated by a first cam-equipped assembly.
- a vertical branch 20a of this arm 20 is in fact free to rotate a roller 23 which fits into a cam-shaped recess 24 carved out in a plate 25, thus creating the first cam-equipped assembly.
- the plate 25 is in turn rigidly connected to a shaft 26 supported at its extremities by bearings 27 provided inside the shoulders 18.
- the shaft 26 carries a further plate 28, created for example by extending the plate 25 and having a smaller diameter, which presents a cam-shaped peripheral surface 29.
- the latter surface 29 engages with a roller 30 supported on a lever 32 and free to rotate in 31, so as to create a second cam-equipped assembly.
- This lever 32 is at one end hinged by a pin 33 to the shoulders 18, while its other end carries a rod 34, arranged as a bracket and turned toward the bottom.
- This rod 34 rests on the stack 14 noting the presence of the sheets and possibly lifting of the stack, if any sheets are found missing at the height required for their pick-up.
- the plates 25 and 28, or alternatively the only plate-type element identifying them are provided on the shaft 26, which carries, in its section close to one of the shoulders 18, a keyed-on first gear 35 that forms part of the group controlling the rotation of the same shaft 26.
- This control or positive mechanical transmission group comprises a further idle intermediate gear 36 and a third gear 37 provided on a shaft 38 which draws its motion from an external motorized device, not shown.
- the latter shaft 38 at its end opposite to that connecting to the motorized device, commands an air distributing and vacuum-actuating complex shown by the number 39, which determines the air emission and aspiration phases on both the suction cups 15, 16 and the blowing nozzles 21.
- a sheet feeder device while acting and operating like a traditional sheet feeder device, solves all the technical problems typical of the complex and delicate structures of the device heretofore known.
- This mechanical engagement also allows to achieve particularly high speeds of picking up and shifting the sheets, which cannot be reliably performed by the complex devices already known.
- the air and vacuum actuating complex designated by the number 39 which determines the air emission and aspiration phases and needs to be connected to an appropriate pump, can simply be replaced by a venturimeter.
- FIGS 3 and 4 clearly show the operation of the exemplified device according to the present invention.
- the actuating of the two suction elements 15 causes the grabbing of a sheet 13 and its lifting when the suction-cups 15 are returned toward the top into their housings 17.
- This motion evolves from the dashed and pointed position of the fixed suction cup 15 shown in Figure 3 to the lifted position pictured as a solid line, in which the sheet 13 shown as dashes and points is grabbed and picked-up by the same fixed suction-cup 15.
- This phase is also aided by the nozzles 21, which assist the separation of the sheet 13 from the underlying stack 14.
- the second suction cups 16 are in this phase placed in the position of Figure 4 in which they have moved the former sheet 13 toward a downstream sheet processing or simply receiving unit (dashes and points in Figure 4).
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sheets, Magazines, And Separation Thereof (AREA)
Description
This invention refers to a sheet feeder device for
the single handling and feeding of stacked sheets.
The industry processing paper in sheet form, such as
for instance the plastifying or printing industry, needs
to be capable of handling large volumes of sheets.
These sheets are generally arranged in a stack and
associated with the printing machine, the plastifying
machine etc., to perform the work required by the
particular treating process.
The sheets must therefore be picked up from the
stack one at a time and conveyed to the next processing
unit. For this purpose, grabbing devices for a single
sheet on top of a stack are known and generally
designated as sheet feeders.
These sheet feeder devices are provided with arms
which generally pick-up the single sheet by suction
grabbing elements to lift it from the stack and shift it
for example to a downstream processing or simply
receiving unit. In particular, the arm or arms move the
relative suction grabbing devices toward the face of the
sheet to be grabbed and transferred, using a vacuum or
similar effect. Some blowing nozzles are simultaneously
activated to favor the detachment of the sheet from the
underlying sheets in the stack, to be followed
immediately by shifting the grabbed sheet toward the next
unit.
The known devices, such as for instance the Italian
patent 1.251.227, are particularly complex in that they
present a complicated arrangement of springs and levers
which must interact to function properly, and are
economically expensive.
Moreover, the very fact of having a complex
kinematic construction prevents the known devices from
operating at high speeds, while causing vibrations
between their parts; such known devices may not even have
a uniform operating behavior, while grabbing the sheets
in slightly differing positions.
DE-A-1 786 117 discloses a sheet feeder device according to the preamble of claim 1.
The purpose of the present invention is to achieve a
sheet feeder device for the single handling and feeding
of stacked sheets capable of overcoming the technical and
economic problems generated by the known, particularly
complex controlling and moving structure.
A further purpose is to produce a sheet feeder
device for the single handling and feeding of stacked
sheets, capable of handling them without error, with an
absolutely uniform action of grabbing a single sheet from
the stack and performing a fixed stroke, and also capable
of operating at high speeds.
These purposes are achieved, according to the
present invention, by producing a sheet feeder device according to claim 1.
An alternative embodiment also provides for a
further set of suction elements which are rigidly
connected to said supporting structure and cooperate with
said at least one set of oscillating suction elements.
Said first recessed cam assembly preferably includes
an idle roller rigidly connected to said oscillating arm
which fits into a cam-shaped recess carved out in a plate
pulled into a rotating motion by the said positive
mechanical transmission.
Such a device is particularly simple, non-vibrating
and also capable of operating at high speeds.
The characteristics and the advantages of a sheet
feeder device for the handling and feeding of single
stacked sheets according to the present invention will
become more evident from the following non-limiting
description referred to the accompanying schematic
drawings, in which:
With reference to the figures, a sheet feeder device
for the single handling and feeding of stacked sheets
built according to the invention is shown and designated
as a whole by the numeral 11.
This device 11 comprises a box-like supporting
structure 12 holding two groups of grabbing elements
which act on the upper face of a sheet 13 to be picked up
and transferred, placed at the top of a stack of sheets
14.
These grabbing elements generally comprise suction
elements 15 and 16 performing this function by a vacuum
or similar principle. Some internal telescopic suction-cups
are held in a housing 17 and activated to emerge
from the same when a vacuum is created in the interior.
Once these suction cups reach the sheet 13, the sheet
grabbing motion is performed and the suction cups are
simultaneously lifted.
In particular, a first set of grabbing elements
comprises two suction elements 15 which are rigidly
connected to the vertical shoulders 18 of the supporting
structure 12. On the other hand, the second set of
grabbing elements comprises the suction elements 16
rigidly connected to the two rods 19 and carried by an
arm 20 oscillating between at least one pair of extreme
positions. The second set of suction elements 16 can in
fact oscillate between a grabbing position on top of the
stack 14 and a releasing position of the single sheet 13,
moved forward toward a next sheet processing or simply
receiving unit.
Both the suction elements 15 and the suction
elements 16 can be fitted with blowing nozzles 21
actuated to favor the detachment of the sheet 13 from the
underlying sheets of the stack 14 during the picking-up
process. Provision is also made for a cross beam 40 which
supports some adjusting elements 41 set vertically before
the stack 14.
The figures show that the arm 20 is shaped to
resemble an upturned U, hinged at the bottom of the U,
placed at its top end, by shafts 22 to the shoulders 18
and oscillated by a first cam-equipped assembly. A
vertical branch 20a of this arm 20 is in fact free to
rotate a roller 23 which fits into a cam-shaped recess 24
carved out in a plate 25, thus creating the first cam-equipped
assembly. The plate 25 is in turn rigidly
connected to a shaft 26 supported at its extremities by
bearings 27 provided inside the shoulders 18.
Moreover, the shaft 26 carries a further plate 28,
created for example by extending the plate 25 and having
a smaller diameter, which presents a cam-shaped
peripheral surface 29. The latter surface 29 engages with
a roller 30 supported on a lever 32 and free to rotate in
31, so as to create a second cam-equipped assembly. This
lever 32 is at one end hinged by a pin 33 to the
shoulders 18, while its other end carries a rod 34,
arranged as a bracket and turned toward the bottom. This
rod 34 rests on the stack 14 noting the presence of the
sheets and possibly lifting of the stack, if any sheets
are found missing at the height required for their pick-up.
As mentioned, the plates 25 and 28, or alternatively
the only plate-type element identifying them are provided
on the shaft 26, which carries, in its section close to
one of the shoulders 18, a keyed-on first gear 35 that
forms part of the group controlling the rotation of the
same shaft 26. This control or positive mechanical
transmission group comprises a further idle intermediate
gear 36 and a third gear 37 provided on a shaft 38 which
draws its motion from an external motorized device, not
shown.
The latter shaft 38, at its end opposite to that
connecting to the motorized device, commands an air
distributing and vacuum-actuating complex shown by the
number 39, which determines the air emission and
aspiration phases on both the suction cups 15, 16 and the
blowing nozzles 21.
It can thus be seen that a sheet feeder device
according to the present invention, while acting and
operating like a traditional sheet feeder device, solves
all the technical problems typical of the complex and
delicate structures of the device heretofore known.
It is immediately apparent that having provided for
a cam-type control of the oscillating suction elements
prevents the occurrence of vibrations during operation.
Moreover, the engagement of the roller 23 inside the cam-shaped
recess 24 guarantees an always exact motion,
precisely because of the positive mechanical engagement
that cannot be loosened or altered.
This mechanical engagement also allows to achieve
particularly high speeds of picking up and shifting the
sheets, which cannot be reliably performed by the complex
devices already known.
It can also be seen that all the springs found on
the known devices to ensure the return of the elements to
their operating positions have advantageously been
eliminated, and that in addition all the control
leverages have been reduced to the minimum.
In an alternative embodiment, the air and vacuum
actuating complex designated by the number 39, which
determines the air emission and aspiration phases and
needs to be connected to an appropriate pump, can simply
be replaced by a venturimeter.
Figures 3 and 4 clearly show the operation of the
exemplified device according to the present invention.
The actuating of the two suction elements 15 causes
the grabbing of a sheet 13 and its lifting when the
suction-cups 15 are returned toward the top into their
housings 17. This motion evolves from the dashed and
pointed position of the fixed suction cup 15 shown in
Figure 3 to the lifted position pictured as a solid line,
in which the sheet 13 shown as dashes and points is
grabbed and picked-up by the same fixed suction-cup 15.
This phase is also aided by the nozzles 21, which assist
the separation of the sheet 13 from the underlying stack
14.
The second suction cups 16 are in this phase placed
in the position of Figure 4 in which they have moved the
former sheet 13 toward a downstream sheet processing or
simply receiving unit (dashes and points in Figure 4).
After leaving this former sheet the suction cups 16
are taken back to the fixed suction cups 15 and grab the
following sheet which has in the meantime been lifted, as
clearly shown in a dashed and pointed form in Figure 3.
The operation continues by the fixed suction cups 15
release of the sheet 13 and the forward motion of the
sheet 13 as a result of the oscillation of the suction
cups 16 induced by the first cam-equipped assembly
mentioned above. This is followed by a sequence of
repeating phases which promotes the shifting of the
single sheets 13 from the stack 14 to the downstream
processing or receiving unit.
These motions are then accompanied by the vertical
oscillation in a lifting and lowering phase of the rod 34
which controls the presence of the sheets at an
appropriate height in the stack, and if these are missing
takes care to lift the stack in the usual manner.
This clarifies the already mentioned advantages of a
device according to the present invention, which operates
in a simple and continuous manner without a chance for
errors even at high speeds.
It is obvious that a simplified execution of the
invention can have only a group of oscillating suction
elements 16, thus simplifying the entire sheet feeder
device even further.
Claims (6)
- A sheet feeder device for the single handling and feeding of stacked sheets comprising a supporting structure (12) holding at least one set of suction grabbing elements (15, 16) which acts on the upper face of a sheet (13) to be grabbed and transferred, placed on top of a stack of sheets (14), where at least one set of suction elements (16) can oscillate between a grabbing position on said stack and a forward releasing position, wherein said at least one set of suction elements (16) is placed below an oscillating arm (20) hinged at its top end (in 22) to shoulders (18) of the said structure (12), and that said oscillation is determined by a first recessed cam assembly (23, 24) which draws its motion from an external motorized device, using a positive mechanical transmission (35-37), characterized in that said first recessed cam assembly comprises an idle roller (23) rigidly connected to said oscillating arm (20) and inserted into a cam-shaped recess (24) carved out of a plate (25) pulled in a rotating motion by said positive mechanical transmission (35-37),
said first cam-recessed assembly is rigidly connected in a rotating motion to a second cam assembly that actuates the lifting and lowering of a rod (34) turned toward the bottom, which rests on said stack of sheets (14) and causes the lifting of said stack if any sheets are missing at the height required for their pick-up,
said second cam assembly comprising a plate (28) having a cam-shaped peripheral surface (29) engaging with a roller (30) which is supported on a lever (32), free to rotate (in 31), rigidly connected in turn to a first extremity of a shaft (33) rotating with respect to said structure (12) and carrying said rod (34) on its other extremity. - A sheet feeder device according to claim 1, characterized in that it provides for a further set of suction elements (15) rigidly connected to said supporting structure (12).
- A sheet feeder device according to claim 1, characterized in that said first and said second cam assembly are produced as a single piece in their plates (25) and (28).
- A sheet feeder device according to claim 1, characterized in that said oscillating arm (20) hinged at its top end (in 22) to the shoulders (18) is shaped in the form of an upturned U.
- A sheet feeder device according to claims 1 or 2, characterized in that said suction grabbing elements (15, 16) are connected to and actuated by an air distributing and vacuum-generating complex (39).
- A sheet feeder device according to claim 1 or 2, characterized in that said suction grabbing elements (15, 16) are connected to and actuated by a venturimeter.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITMI971618 | 1997-07-08 | ||
| IT97MI001618A IT1293588B1 (en) | 1997-07-08 | 1997-07-08 | SHEET FEEDER FOR HANDLING AND SINGLE FEEDING OF STACKED SHEETS |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0890535A1 EP0890535A1 (en) | 1999-01-13 |
| EP0890535B1 true EP0890535B1 (en) | 2002-09-04 |
Family
ID=11377520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98202275A Expired - Lifetime EP0890535B1 (en) | 1997-07-08 | 1998-07-07 | Sheet feeder device for the single handling and feeding of stacked sheets |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0890535B1 (en) |
| DE (1) | DE69807607T8 (en) |
| ES (1) | ES2181119T3 (en) |
| IT (1) | IT1293588B1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116969218B (en) * | 2023-09-15 | 2023-12-26 | 江苏金典高科数码有限公司 | Paper conveying device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1786117A1 (en) * | 1968-08-20 | 1971-11-18 | Adamovske Strojirny Np | Device for driving a sheet feeding device, in particular for printing machines |
| JPS517404B1 (en) * | 1971-06-30 | 1976-03-08 | ||
| DE4006635A1 (en) * | 1990-03-03 | 1991-09-05 | Georg Binnen | TOW NOZZLE DEVICE FOR HIGH SPEED BOW FEEDER |
| IT1251227B (en) * | 1991-08-20 | 1995-05-05 | Franco Pezzini | SHEET FEEDER FOR THE TRANSFER OF SHEETS FROM A STACK TO A RECEIVER OR WORK PLAN |
-
1997
- 1997-07-08 IT IT97MI001618A patent/IT1293588B1/en active IP Right Grant
-
1998
- 1998-07-07 EP EP98202275A patent/EP0890535B1/en not_active Expired - Lifetime
- 1998-07-07 ES ES98202275T patent/ES2181119T3/en not_active Expired - Lifetime
- 1998-07-07 DE DE69807607T patent/DE69807607T8/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| DE69807607D1 (en) | 2002-10-10 |
| IT1293588B1 (en) | 1999-03-08 |
| DE69807607T8 (en) | 2004-07-08 |
| DE69807607T2 (en) | 2003-06-05 |
| ITMI971618A0 (en) | 1997-07-08 |
| ES2181119T3 (en) | 2003-02-16 |
| ITMI971618A1 (en) | 1999-01-08 |
| EP0890535A1 (en) | 1999-01-13 |
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