U.S. patent number 3,776,393 [Application Number 05/255,059] was granted by the patent office on 1973-12-04 for transfer apparatus.
Invention is credited to Gerd Bargstedt.
United States Patent |
3,776,393 |
Bargstedt |
December 4, 1973 |
TRANSFER APPARATUS
Abstract
The apparatus serves to transfer items between two stations. A
frame is disposed between said two stations and at its top carries
a first pivot. A first rocker lever assembly is pivoted on the
first pivot and has a longer portion on one side of the first
pivot. A second pivot is carried by the first rocker lever assembly
and parallel to and spaced from the first pivot. A second rocker
lever assembly is mounted on the second pivot and rotatable in
unison with the first rocker lever assembly during a movement of
the latter. Connecting drive means connect the first and second
rocker lever assemblies and are arranged to impart to the second
rocker lever assembly a movement in dependence on the movement of
the first rocker lever assembly. Holding means for holding items
are carried by the first and second rocker lever assemblies at
those ends thereof which are most remote from the associated first
and second pivots. The first and second rocker lever assemblies are
pivotally movable over head and have different lengths between the
associated first and second pivots and the ends provided with the
holding means. Said lengths are selected so that the holding means
are equally spaced from the first pivot means when the first and
second rocker lever assemblies are angularly spaced 180.degree.
apart.
Inventors: |
Bargstedt; Gerd (Drochtersen,
DT) |
Family
ID: |
5808841 |
Appl.
No.: |
05/255,059 |
Filed: |
May 19, 1972 |
Foreign Application Priority Data
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May 25, 1971 [DT] |
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P 21 25 846.8 |
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Current U.S.
Class: |
414/733; 414/793;
414/737; 414/797 |
Current CPC
Class: |
B65H
3/0816 (20130101); B65G 61/00 (20130101); B65H
29/241 (20130101); B65H 29/50 (20130101) |
Current International
Class: |
B65H
29/50 (20060101); B65H 29/00 (20060101); B65H
3/08 (20060101); B65H 29/24 (20060101); B65G
61/00 (20060101); B65g 059/04 () |
Field of
Search: |
;214/1BV,1BD,147T,8.5D,8.5C |
Foreign Patent Documents
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623,826 |
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Aug 1961 |
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IT |
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931,460 |
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Aug 1955 |
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DT |
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Primary Examiner: Forlenza; Gerald M.
Assistant Examiner: Abraham; George F.
Claims
What is claimed is:
1. A transfer apparatus for transferring items between two
stations, which comprises
a frame (5, 25, 26) disposed between said two stations,
a first pivot (6) carried by the frame at its top,
a first rocker lever assembly (9, 51, 52), which is pivoted on the
first pivot and has a longer portion on one side of the first
pivot,
a second pivot (13, 59), which is carried by the first rocker lever
assembly and parallel to and spaced from the first pivot,
a second rocker lever assembly (14, 60, 61), which is mounted on
the second pivot, which is rotatable in unison with the first
rocker lever assembly (9, 51, 52) during a movement of the
latter,
connecting drive means (58, 63) which connect the first and second
rocker lever assemblies and are arranged to impart to the second
rocker lever assembly a movement in dependence on the movement of
the first rocker lever assembly, and
holding means for holding items, which holding means are carried by
the first and second rocker lever assemblies at those ends thereof
which are most remote from the associated first and second
pivots,
the first and second rocker lever assemblies (9, 14; 51; 52; 60,
61) being pivotally movable over head and having different lengths
between the associated first and second pivots and the ends
provided with the holding means, said lengths being selected so
that the holding means (10, 15, 64, 65) are equally spaced from the
first pivot (6, 43, 44) when the first and second rocker lever
assemblies (9, 14; 51, 52; 60, 61) are angularly spaced 180.degree.
apart; and
drive means for pivotally oscillating the first rocker lever
assembly (9, 51, 152) through substantially 180.degree..
2. An apparatus as set forth in claim 1, in which
the first rocker lever assembly (9, 51, 52) has a shorter portion
which extends from the longer portion beyond the first pivot (6,
43, 44),
said shorter portion carries the second pivot (13, 59) for the
second rocker lever assembly (14, 60, 61), and
the second rocker lever assembly (14, 60, 61) provides for a
counterbalancing of the first rocker lever assembly (9, 51,
52).
3. An apparatus as set forth in claim 1, in which
the driving means comprise a crank mechanism (20, 21, 55, 56),
which drives a rack (55),
a bearing bushing (53) of the first rocker lever assembly is
non-rotatably connected to a gear (54) in mesh with said rack (55)
in such a manner that the holding means consisting of lifting beams
(10, 15, 64, 65) are disposed over associated delivering and
receiving means (2, 3, 23, 24) at the stations when the crank arm
(21, 56) is aligned with the rack (20, 55) driven by it.
4. An apparatus as set forth in claim 1, in which
the holding means consist of lifting beams and are rotatably
mounted in the rocker lever assemblies and operatively connected to
drive means, which comprise drive chains,
said drive means maintain the absolute orientation of the holding
means during a movement of the rocker lever assemblies and comprise
for each drive chain a first chain sprocket secured to a holding
means and also comprise second chain sprockets (68, 71), which are
mounted on the pivot pins (44, 59) of the respective rocker lever
assemblies,
one second chain sprocket (68) for the first rocker lever assembly
(51, 52) is non-rotatably secured to the pivot pin (44) of the
first pivot, which is carried by the frame,
the other second chain sprocket (71) is rotatably mounted on the
second pivot pin (59) of the second pivot for the second rocker
lever assembly (60, 61), and
drive means are connected between the other second chain sprocket
(71) and a chain sprocket (73) non-rotatably mounted on the first
pivot pin (44).
5. An apparatus as set forth in claim 1, in which the second rocker
lever assembly comprises rocker levers, which have an extension,
which extends beyond the second pivot from the portion provided
with the holding means and which carries a counterweight (85).
6. An apparatus as set forth in claim 1, in which
a vertical track is provided in the frame (25, 26),
a carriage (41, 42) is vertically movable in said track, and
carries the first pivot (43, 44) for the first rocker lever
assembly (51, 52), and
drive means (48, 49, 50) are provided for vertically moving the
carriage (41, 42).
7. An apparatus according to claim 3, in which
the crank mechanism comprises a drive crank (56),
a drive motor (57) is connected to a drive shaft (78) for the drive
crank,
the drive crank (56) and the drive motor (57) are carried by a boom
(76), which is pivoted on a pivot pin (43) of the first pivot for
the first rocker lever assembly (51, 52), and
the pivotal movement and adjustment of the boom (76) relative to
the first pivot (43, 44) determines the direction of the two rocker
lever assemblies (51, 52; 60, 61) when aligned.
8. An apparatus as set forth in claim 7, in which
a drive chain sprocket is mounted on the pivot pin (43) of the
first pivot and rotatable in unison with the boom (76),
another drive chain sprocket (63) is mounted on the pivot pin (59)
of the second pivot for the second rocker lever assembly and
non-rotatably connected to the latter, and
a drive chain is trained around the two drive chain sprockets (58,
63).
9. An apparatus as set forth in claim 7, in which
a link (82) is pivoted at one end to first bearing means (83) at
one of the stations adapted to support items,
the other end of the link (82) is pivoted by second bearing means
(81) to the free end of the boom (76), and
the direction of the boom (76) varies in dependence on the vertical
movement of the carriage (41, 42) as the height of a stack (23) is
changed.
Description
This invention relates to a transfer apparatus for transferring
items between two stations, which apparatus comprises two rocker
lever assemblies which are movable one in the other between the
stations and which are provided at their ends with holding means
and are pivotally movable by common drive means about horizontal
pivots.
Known transfer apparatus which are suitable as stacking means and
may also be used as feeders comprise a rocker lever assembly which
consists of only two rocker levers, between which a lifting beam is
rotatably mounted and carries, e.g., suction grippers. In such
apparatus it is known to drive the lifting beams by
power-transmitting means, such as a chain transmission, in such a
manner that resulting translatory movements are imparted to the
suction grippers so that their absolute orientation is maintained
during such movements. Such simple rocker lever assemblies may be
provided on both sides of a conveyor belt and may alternatingly
cooperate with stacks disposed on both sides of the conveyor belt.
In this case, the frequency of the cyclic operation is controlled
by the movement of the rocker lever assembly and this movement must
not be excessively large so that the holding at the suction
grippers is not endangered.
The invention is based on the recognition that a rocker lever
assembly provides for the optimum path of movement because it
enables a transfer along the shortest path which is practicable,
relatively simple drive means may be used to impart a pivotal
movement, there is no need for rail tracks, and a simple bearing
arrangement may be provided for the transfer elements in that a
lifting beam is moved in a defined manner from above to the
delivering or receiving station.
It is an object of the invention so to improve such transfer
apparatus that the same speed of operation is enabled as with a
normal, simple rocker lever assembly and the frequency of the
cyclic operation of the apparatus is doubled without need for more
frame means. As a result, in spite of the fact that the frequency
of the cyclic operation is doubled, each item is moved
substantially at the same speed from one side, e.g., of a conveyor
belt. The known values are also doubled with two-sided
arrangements.
This object is accomplished according to the invention in that a
rocker lever assembly (which will be referred to hereinafter as the
first rocker lever assembly) is connected to the frame by a first
pivot and is provided with a second pivot, which is parallel to and
spaced from the first pivot and serves to mount a second rocker
lever assembly and is moved in unison with the first rocker lever
assembly, that a drive linkage is provided between the two rocker
lever assemblies and serves to derive the movement of the second
rocker lever assembly from the movement of the first rocker lever
assembly, and that the two rocker lever assemblies are pivotally
movable over head and have different lengths, which are selected so
that the holders provided at the ends of the two rocker lever
assemblies are spaced equal distances from the first pivot when the
rocker levers are angularly spaced 180.degree. apart.
This arrangement comprises two rocker lever assemblies having
rocker levers which differ in length and which can be moved in
opposite directions one in the other so that the lifting beams are
moved one past the other with a suitable spacing between them. In a
preferred embodiment, the spacing is increased in that the second
pivot for the second rocker lever assembly is moved from the path
of movement of the lifting beam of the first rocker lever assembly
during the movement of the latter.
The last-mentioned remark is applicable to the preferred embodiment
in which the first rocker lever assembly is extended in length
beyond the first pivot and at its extended end carries the second
pivot from the second rocker lever assembly. The sum of the
distance from the first pivot fixed to the frame to the second
pivot for the rocker lever assembly and the effective length of the
rocker levers of the second rocker lever assembly is equal to the
effective length of the rocker levers of the first rocker lever
assembly. The effective length is the distance from the lifting
beam to the associated pivot. This embodiment is preferred.
However, the general concept of the invention also includes an
arrangement of the second pivot between the lifting beam of the
first rocker lever assembly and the first pivot for said rocker
lever assembly. The preferred embodiment has the advantage that the
first rocker lever assembly provides for a counterbalancing of the
first rocker lever assembly and also affords the above-mentioned
advantage that the second pivot is automatically moved away from
the path of movement of the first lifting beam during the movement
of the first rocker lever assembly so that the second lifting beam
is movable along a substantially elliptical path.
It will be readily understood that the first rocker lever assembly
can be operated at the same frequency as known rocker lever
assemblies and that the second rocker lever assembly comprising a
second lifting beam is driven at the same time to perform opposite
cycles of operation.
The drive means comprise preferably a crank mechanism, which is
adjusted so that the lifting beams are disposed over associated
delivering and receiving means and the rocker levers of the two
rocker lever assemblies are angularly spaced 180.degree. apart when
the crank arm extends in the direction of a rack which is driven by
the crank arm.
In view of the driving characteristics of a crank mechanism, this
arrangement has the advantage that the movement of the rocker lever
assemblies will be automatically retarded when the lifting beams
approach the delivery and receiving stations whereas the maximum
speed is reached in the central portion of the movement between
these end positions.
Each rocker lever assembly comprises suitably two rocker levers,
and the second rocker lever assembly is disposed within the
first.
In such apparatus, in which the holders are rotatably mounted and
in which their absolute orientation is maintained during the
movement of the rocker lever assemblies in that the holders are
driven by drive chains having a chain sprocket which is secured to
the holder and another chain sprocket which is carried by the pivot
pin for the rocker lever assembly, a desirable feature resides in
that the other chain sprocket for the first rocker lever assembly
is non-rotatably secured to the pivot pin of the first pivot
mounted in the frame and the other chain sprocket for the second
rocker lever assembly is rotatably mounted on the pivot pin of the
pivot means for the second rocker lever assembly and is operatively
connected to a chain sprocket which is non-rotatably secured to the
first pivot pin.
Whereas it has been stated hereinbefore that the second rocker
lever assembly provides for a counterbalancing of the first rocker
lever assembly, it is a preferred feature that the rocker levers of
the second rocker lever assembly are also extended in length beyond
their pivot and provided with a counterweight.
It will be understood that the so-called first pivot for the first
rocker lever assembly may be provided on a certain level and in
this case one stack must be provided on a platform which is movable
in height. That arrangement also affords the advantage in
comparison to known arrangements that the frequency of the cyclic
operation is doubled whereas each item is moved at the same speed
and a simple design is used.
In another preferred embodiment, the first pivots for the first
rocker lever assembly are mounted in the frame, specifically in a
suitably two-part, vertically movable carriage of the frame. In
that arrangement, an important improvement is afforded by the fact
that the drive crank and its drive motor are carried by a boom,
which is pivotally movable about the pivot pin for the first rocker
lever assembly and the adjustment of said boom relative to the
first pivot bearing determines the direction of the parallel
orientation of the two rocker lever assemblies so that the speeds
are correctly controlled during their movements. If the first pivot
is adjustable in height, continual opposite changes in height will
be avoided if the end of the boom is held by a link in a fixed
relation to receiving or delivering means and the carriage or the
carriage parts are movable in steps in dependence on the change in
height, e.g., of a stack. In this case, the apparatus performs very
small steps, which correspond to the increase or decrease of a
stack and result in an automatic adjustment relative to a fixed
deck level whereas the first pivot performs very small movements
and, surprisingly, the length of the path of movement between the
delivering and receiving means remains the same in spite of the
change of the level on which one of these means is disposed.
In a desirable arrangement, the pivot pin of the second pivot for
the second rocker lever assembly comprises a shaft, which is
non-rotatably connected to the first rocker lever assembly, a
bearing bushing is rotatably mounted on said shaft, the second
rocker lever assembly is non-rotatably se-cured to said bushing, a
gear element, particularly a spur gear, is carried by said bushing
and is operatively connected to another gear element, particularly
a spur gear, preferably by a rack, and said other gear element is
connected to the rotary drive for the first rocker lever
assembly.
The invention will now be described with reference to embodiments
shown by way of example on the drawing, in which
FIG. 1 is a diagrammatic side elevation showing an apparatus
according to the invention.
FIGS. 2a to 2e illustrate various phases of the operation of two
rocker lever assemblies connected in accordance with the invention,
in order to explain the principle.
FIG. 3 is a side elevation showing another embodiment of the
invention comprising delivering and receiving means on different
levels, at least one of which means varies in height.
FIG. 4 is a top plan view showing the apparatus of FIG. 3.
FIG. 5 is an enlarged elevation of the apparatus of FIG. 4 and
explains the driving elements. Certain elements are shown
diagrammatically and others in section.
FIG. 6 is an enlarged side elevation showing the beam of FIG. 3
and
FIG. 7 is a sectional view taken on line VII--VII in FIG. 6.
In FIG. 1, an apparatus according to the invention is generally
designated 1 and is disposed between a roller conveyor 2 and stack
of plates 3, which is mounted on a vertically movable platform 4.
The drive means for this platform are not shown and are designed so
that the uppermost plate of the stack 3 is always held on the top
level of the roller conveyor 2.
The apparatus 1 comprises a frame 5, in the top of which the
so-called first pivot 6 is mounted exactly in the middle between
the vertical center lines 7, 8 of the stack 3 and the roller
conveyor 2. The first rocker lever assembly is mounted on the first
pivot 6 and comprises rocker levers 9, which at their ends carry a
lifting beam 10 provided with suction grippers 11. The lifting beam
is moved along the arc of a circle 12 above the center line 8 of
the roller conveyor.
Rocker levers 14 of a second rocker lever assembly are mounted on
the rocker lever 9 of the first rocker lever assembly at a point
spaced from the first pivot 6 and at their ends carry a second
lifting beam 15 provided with suction grippers 16. The second
lifting beam 15 is moved along the substantially elliptical line 17
in phase opposition to the first lifting beam 10.
The rocker levers of the second rocker lever assembly are extended
beyond the second pivot 13 and at their free end carry a
counterweight 18.
The sequence of operations will be explained more in detail with
reference to FIG. 2. It is pointed out at the same time that a gear
19 is provided on the first pivot and is particularly non-rotatably
secured to the first rocker lever assembly and in mesh with a rack
20, which is mounted on a crank arm 21 of a crank mechanism. This
mechanism is designed so that the crank 21 and the rack 20 are
aligned when the lifting beams 9, 15 are at their points of
reversal. This arrangement results in a desirable movement in which
the highest speed is reached in the central portion of the path of
movement 12 or 17.
It is pointed out at this juncture that the pivotal movement of the
second rocker levers is also derived from the gear 19, as will be
explained more fully hereinafter.
Reference is made first to FIG. 2, where the same reference
numerals are used as in FIG. 1. FIG. 2 shows the first rocker
levers 9, the second rocker levers 14, the first pivot 6 secured to
the frame and the second pivot 13 for the second rocker levers 14.
The pivot 13 is arranged on an extension of the first rocker levers
9. It is apparent that the lifting beam 10 is moved along an arc of
a circle through the positions 10', 10", 10'", 10"" when the first
rocker lever assembly is pivotally moved about the first pivot. As
a result, the second pivot 13 is moved on an opposite arc of a
circle through positions 13', 13", 13'", 13"" so that the second
rocker levers 14 having inherently a shorter effective length are
moved away from the path of movement 10, 10', 10", 10'", 10"" by
the movement of the pivot 13. The substantially elliptical path of
movement of the second lifting beam 15 of the second rocker lever
assembly extends through positions 15', 15", 15'", 15"". Owing to
the movement of the second pivot 13, the distance between the
positions 10" and 15" in which the two lifting beams meet is larger
than would correspond to the difference between the effective
lengths of the rocker levers 9 and 14. The effective lengths are
the lengths between the associated lifting beams and the
pivots.
FIG. 2 illustrates also the movement of the counterweight disposed
at the extended ends of the second rocker levers 14. This
counterweight 18 moves through positions 18', 18", 18'", 18"".
A particularly preferred embodiment will be explained with
reference to FIGS. 3 to 5. The further drive means will be
explained with reference to the enlarged FIG. 5. In these figures
and in FIGS. 6 and 7 showing components, similar parts are
designated with the same reference characters.
Two frame standards 25, 26 are disposed between delivering means 22
for a stack 23 and a conveyor belt 24. Each standard comprises two
posts 27, 28 or 29, 30 and vertical track rails 31-34 mounted on
the confronting sides of said posts. Track rollers 35, 36, 37, 38
and 39, 40 of respective carriages 41, 42 are guided in these track
rails and carry pivot pins 43, 44 of the first pivot. The carriages
are provided with vertically spaced nuts 45, 46 having threaded
bores, which engage screws 47, 48, which are driven by means of
bevel gears 49 from a motor 50 (FIGS. 3 and 4), which drives a
shaft disposed between the frames 25, 26.
By an intermittent energization of the motor, the carriages can be
vertically moved in the frames in an upward or downward direction,
depending on the increase or decrease in height of the stack
23.
The purpose of this drive will be explained hereinafter. It is
pointed out at this juncture that the rocker levers 51, 52 of the
first rocker lever assembly are freely rotatably mounted on the
pivot pins 43, 44. The bearing bushing 53 of the rocker lever 52 on
the input side extends through the frame and has a gear 54
non-rotatably secured to it. The gear 54 is in mesh with a rack 55,
which is connected to the crank 56 of a crank mechanism, which is
connected to a drive motor 57 (see also FIGS. 6 and 7). A
transmission element, such as a chain sprocket 58, is non-rotatably
secured to the pivot pin 43.
The two rocker levers 51, 52 are extended beyond the pivot pins 43,
44 and at their ends carry an additional pivot pin 59, on which the
second rocker levers 60, 61 of the second rocker lever assembly are
freely rotatably mounted. The bearing bushing 62 of the rocker
lever 61 on the input side is non-rotatably connected to a chain
sprocket 63, which is thus non-rotatably connected to the second
rocker lever assembly. A chain is trained around the sprocket wheel
63 and the sprocket wheel 58. The movement imparted to the first
rocker lever assembly 51, 52 thus results in the movement described
with reference to FIG. 2 of the second rocker lever assembly 60,
61.
The first lifting beam 64 is freely rotatably mounted in the ends
of the first rocker levers 51, 52. The second lifting beam 65 is
freely rotatably mounted in the ends of the second rocker levers
60, 61. The two lifting beams are non-rotatably connected to a
chain sprocket 66 or 67. The other chain sprocket 68 associated
with the chain sprocket 66 of the first rocker lever assembly is
non-rotatably secured to the pivot pin 44. An endless chain 69 is
trained around the two chain sprockets 66, 68 and ensures that the
lifting beam 64 rotates relative to the rocker levers carrying the
beam during the movement of said levers so that the suction
grippers 70 and 70' are maintained in their absolute
orientation.
The other chain sprockets 71 associated with the chain sprocket 67
is rotatably mounted on the second pivot pin 59 and together with a
second chain sprocket 72 forms a twin sprocket. This second
sprocket is associated with a chain sprocket 73, which together
with another chain sprocket 68 forms a twin sprocket, which is
non-rotatably mounted on the pivot pin 44. A chain is trained
around the two chain sprockets 72, 73 and during a pivotal movement
of the second rocker lever assembly 60, 61 rotates the other chain
sprocket 71 of said rocker lever assembly in such a manner that an
endless chain 74 trained around the chain sprockets 67, 71 imparts
such an angular movement to the lifting beam 65 that it performs a
resulting translation and the orientation of the suction grippers
75 and 75' is maintained throughout their movement.
The embodiment shown in FIGS. 3 to 7 is preferred. The level of the
stack 70 may be varied without a change of the path of movement of
the lifting beams between the stack and the conveyor belt 24. For
this purpose, the crank mechanism 56, 57 is mounted on a boom 76,
which is shown on an enlarged scale in FIG. 6 and is secured to the
pivot pin 43. Because the pivot pin is rotatable in the bushing 53
and the latter is rotatable within a bearing 77, pivotal movement
of the boom 76 will move the chain sprocket 58 and at the same time
by the pivotal movement of the pivot pin 78 of the crank 56 will
move the gear 54 so that the rocker levers of both rocker lever
assemblies will be pivotally moved while being in alignment. At the
same time, the non-rotatably mounted chain sprockets 68, 73 cause a
corresponding change of the relation of the lifting beams 64, 65 to
the rocker levers 51, 52 so that the suction grippers 75, 75'
always have a vertical orientation when the rocker levers are
aligned.
As is apparent from FIGS. 6 and 7, the rack 55 is urged into
engagement with the gear 54 by a holding-down roller 80, which is
biased by a spring 79. As described, the axis of the gear 54
coincides with the axis of rotation of the boom 76. It is apparent
from FIGS. 3 and 5 that the rack 55 is aligned with the crank arm
56 when the suction grippers 75, 75' are on the delivering and
receiving means.
To ensure an efficient sequence of movements, that end of the boom
which is remote from the pivot pin 43 is pivoted by a pin 81 to a
link 82, which at its lower end is connected by a pin 83 to the
baseplate 84 of a frame.
When the drive mechanism 45, 46, 47, 48, 50 imparts an intermittent
downward movement to the carriages 41, 42 during unstacking, as is
shown in FIG. 3, the free end of the boom is substantially held on
the same level so that the aligned rocker lever assemblies are
gradually pivotally moved about the pivot pin 81 whereas the
driving conditions are maintained and the operation may be carried
out without an excessive vertical movement, particularly without a
reciprocating vertical movement, whereas the height of the stack is
varied and the path of movement of the items, such as plates,
remains the same. In this arrangement, the lateral shift which is
due to a certain outward pivotal movement about the pivot pins 43,
44 of the first pivot can be neglected.
The rocker levers 60, 61 are suitably extended in length beyond
their pivot pins 59 and at the ends of the extension carry a
counterweight 85. Whereas this design is preferred, a pivot pin
corresponding to the second pivot pin 59 may be arranged between
the pivot pins 43, 44 and the lifting beam 64 on the rocker levers
51, 52, although this would adversely affect the automatic
counterbalancing of the first rocker lever assembly and would
reduce the distance between the paths of movement of the lifting
beams.
Where different items are to be transferred, the suction grippers
may be replaced by magnetic grippers, clamping means or the
like.
* * * * *