U.S. patent number 3,692,303 [Application Number 05/165,682] was granted by the patent office on 1972-09-19 for sensing means for folder.
This patent grant is currently assigned to Mecca Bros, Inc.. Invention is credited to Frederick W. Grantham.
United States Patent |
3,692,303 |
Grantham |
September 19, 1972 |
**Please see images for:
( Certificate of Correction ) ** |
SENSING MEANS FOR FOLDER
Abstract
A sensing device for folders that are adapted particularly to
folding textile pieces and laundry pieces; in the folding operation
in such a folder, the means first senses the leading edge of the
piece to be folded and initiates a first and slow movement of
sensing control, and then senses the trailing edge and initiates a
second and fast movement of the sensing control, whereby the fast
movement occurs for a longer or shorter period according to whether
the piece is respectively shorter or longer, and thereby effects
operation of the folding element at the desired location, (e.g.,
the middle), of the piece regardless of the length of the
piece.
Inventors: |
Grantham; Frederick W. (Los
Angeles, CA) |
Assignee: |
Mecca Bros, Inc. (North
Collins, NY)
|
Family
ID: |
22599987 |
Appl.
No.: |
05/165,682 |
Filed: |
July 23, 1971 |
Current U.S.
Class: |
493/15; 493/19;
493/23; 493/21 |
Current CPC
Class: |
D06F
89/00 (20130101) |
Current International
Class: |
D06F
89/00 (20060101); B65h 045/00 () |
Field of
Search: |
;270/61,62 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Mancene; Louis G.
Assistant Examiner: Cutting; Robert F.
Claims
I claim:
1. In a folder, means for sensing a piece to be folded,
comprising,
means for conveying the piece through the folder,
folding means positioned in predetermined position folding the
piece,
a sensing element responsive to movement relative to the conveying
means for cooperating therewith for folding the piece, along the
conveying means and particularly responsive to the leading edge of
the piece passing thereby and similarly responsive to the trailing
edge passing thereby,
low-speed motor means and first means for energizing it controlled
by the sensing element pursuant to the leading edge of the piece
passing by the sensing element,
high-speed motor means and second means for energizing it
controlled by the sensing element pursuant to the trailing edge of
the piece passing by the sensing element, and
means responsive to the combined effect of the movements of the
low-speed and the high-speed motors for operating the folding means
at an intermediate position relative to the leading and trailing
edges passing by the sensing element.
2. Sensing means in a folder according to claim 1 wherein the last
means includes a first switch means in fixed position and actuated
by the motor means,
a second switch adjustable in position, and
wherein the motor means are operative first in an initial portion
of the movement thereof for actuating the first switch, and in a
latter portion thereof for actuating the second switch, and finally
to again actuate the first switch for terminating the cycle.
3. Sensing means in a folder according to claim 1 wherein the
switch means is mounted on the low-speed motor and moved
thereby,
the high-speed motor while moving in its faster rate proceeds to
the position of the switch and upon contact therewith effects
actuation of the folding means, and
means responsive to actuation of such switch operative for stopping
the motors.
4. In a folder means for sensing a piece to be folded
comprising,
means for conveying the piece through the folder,
folding means positioned in predetermined position relative to the
conveying means for cooperating therewith for folding the
piece,
a sensing element responsive to movement of the piece along the
conveying means and particularly responsive to the leading edge of
the piece passing thereby and similarly responsive to the trailing
edge passing thereby,
low-speed and high-speed motor means,
first switch means in fixed location,
second switch means angularly displaced from the first switch
means,
a low-speed motor and a high-speed motor with common angularly
rotating arms having a zero position in which the contact and
control the first switch means, means responsive to the sensing
means for initiating movement of the low-speed motor in response to
the leading edge of the piece passing by the sensing element
whereby the first switch means is actuated to a different control
position,
means responsive to the trailing edge of the piece passing by the
sensing element for initiating movement of the high-speed motor,
whereby the low-speed motor is stopped and the high-speed motor
continues to move and wherein the high-speed motor continues to
move the angularly movable arms into engagement with a second
switch, and they perform a switching operation on the latter which
in turn effects actuation of the folding means, and the high-speed
motor continues to operate and move the arm means past the second
switch and into operative engagement with the first switch
terminating movement at substantially the beginning of that
movement.
5. Sensing means in a folder according to claim 4 wherein the
motors have a common axis and rotate in the same direction
considered in axial view and the arm means include overrunning
clutches whereby to enable each motor to drive ahead regardless of
the position or movement of the first motor.
6. Sensing means in a folder according to claim 5 wherein the
sensing element includes a PE cell and a relay control thereby
whereby in response to the leading edge of the piece passing by the
PE cell the relay is shifted into operative position for operating
the low-speed motor and upon its trailing edge passing ny the PE
cell, it effects shifting of the relay to a position for stopping
the low-speed motor and operating the high-speed motor.
7. Sensing means in a folder according to claim 5 wherein the
sensing means includes a switch with an operating finger disposed
in the path of the piece and upon engagement by the piece at the
leading edge of the latter, the actuating finger is moved to a
first position whereby it controls movement of the slow-speed motor
and that condition continues throughout the movement of the piece
pass the switch and upon the trailing edge of the piece passing the
switch, the switch returns to its first position and effects
stopping of the low-speed motor and starting of the high-speed
motor.
8. Sensing means in a folder according to claim 2 wherein the last
means includes a relay movable to respectively opposite positions
for controlling the motors.
9. Sensing means in a folder according to claim 8 and including
timer means for controlling the relay means.
10. Sensing means according to claim 1 wherein the motors have a
common axis and a common beginning position, but random relative to
angular position around the axis.
11. Sensing means in a folder according to claim 2 wherein the
motors have a common axis, and radial arms for controlling the
switches, and the arms move in unison around the axis.
12. Sensing means in a folder according to claim 3 wherein the
motors have a common axis, and radial arms for controlling the
switches, and the arms move in unison around the axis.
Description
OBJECTS OF THE INVENTION:
A broad object of the invention is to provide in a folder novel
means for folding pieces regardless of their length when pieces are
introduced into the folder in random lengths.
Another object is to provide folding means of the kind just
previously referred to which includes novel mechanical means for so
performing the operation.
Still another and more specific object is to provide a folder of
the foregoing character which includes a first and low-speed motor
controlling a switch operation which moves a switch control element
toward a second switch, and a control element controlled by the
movement of the piece to be folded for controlling a second and
high-speed motor which in turn controls the second switch and the
folding operation.
A still further and more specific object, is to provide a folder of
the kind referred to just immediately above, and which includes two
forms, in a first of which the motors begin and terminate in a zero
position in a construction which may be regarded as the more
simple, and in the second of which the motors begin and terminate
in any and random positions, regardless of the effective position
in the next previous operation.
DESCRIPTION OF A PREFERRED EMBODIMENT:
In the drawings:
FIG. 1 is a side elevational view of a motor-drive operation
utilized in a first form of the invention;
FIG. 2 is a view taken at line 2--2 of FIG. 1;
FIG. 3 is a semi-diagrammatic illustration of the principal
components of a folder embodying features of the present
invention;
FIG. 4 is a view similar to FIG. 3, representing a modified form of
electrical control;
FIG. 5 is a diagram of the electrical circuit utilized in the form
of FIGS. 1 to 4;
FIG. 6 is a side view of a motor-drive of a modified form of
control and oriented in a direction similar to that of FIG. 1;
FIG. 7 is a view taken at line 7--7 of FIG. 6 and showing only the
elements exposed in the plane of that line;
FIG. 8 is a view taken at line 8--8 of FIg. 6; and
FIg. 9 is an electrical circuit utilized in the form of the
construction of FIGS. 6 to 8.
Referring in detail to the accompanying drawings, attention is
first directed to FIGS. 1 to 5 showing a first form of the
invention. In FIG. 1 a motor 10 is shown, of low speed operation
such as 60 RPM, having a drive shaft 12 to which is connected an
overrunning clutch 14. Connected to the shaft and leading from the
clutch is a radial arm 16 at the outer end of which is secured an
axial pin 18 and referred to also as a connector.
The construction of FIG. 1 also includes a second motor 20 of
higher speed than the first motor 10, and in the present instance
of twice that speed, or 120 RPM. The motor 20 includes a drive
shaft 22 to which is secured an overrunning clutch 24, and a radial
operating arm 26 is connected with the shaft 22 and leads from the
overrunning clutch. The operating arm 26 has a slot 28 receiving
the connector pin 18 so that the two arms rotate together about the
common axis 30 of the shafts 12, 22. The overrunning clutches 14,
24 may be of any suitable and known kind.
The motors 10, 20 have been designated as being 60 and 120 RPM, and
thus of the ratio 1:2, which effects folding of the pieces at the
middle, which in most cases is desired, but it may be desired to
fold the pieces at a location other than the middle and in that
case the motors would be pre-selected for different corresponding
speed. This relationship will be referred to again hereinbelow.
THe construction includes a first switch 32 in fixed position,
having a switch actuating blade 34 actuatable by the connector or
pin 18.
The construction also includes a a second switch 36 mounted on an
arm 38 angularly adjustable about the axis 30, which can be fixed
in adjusted position by conventional means indicated at 40. The
switch 36 includes an actuating arm 42 which is also engageable by
the connector or pin 18 in a manner referred to hereinbelow.
FIG. 5 shows the circuit embodying the motors and switches referred
to above. The circuit includes input lines 44, 46, the motors 10,
20, and the switches 32, 36. The circuit also includes relay means
48 which is also included in FIGS. 3 and 4. The relay means 48 may
take the form of a PE cell or a mechanical electrical switch as
desired and as will be referred to again hereinbelow, the PE cell
being indicated at 48a in FIG. 3 and a mechanical switch being
indicated at 48b in FIG. 4. The operation is the same in both cases
and the difference in construction is dictated according to
preference. The relay means 48 (FIG. 5) includes a switch 50 of
single pole, double throw character, having terminals No. 7 and No.
8.
Reference is next made to FIG. 3 representing in a diagrammatic
way, a folder 52. The folder includes a first conveyor belt 54 and
a second conveyor belt 56 with a gap 58 therebetween. A piece to be
folded is indicated at 60, on the first conveyor belt 54 along
which it moves and onto the second conveyor belt 56. The piece has
a leading edge 60a and a trailing edge 60b, and as it goes across
the gap 58 from the first conveyor to the second, it is folded by a
folding knife 62 in cooperation with folding conveyors 64, this
knife and those conveyors being of conventional kind. The folding
knife 62 is operated by an air cylinder 66 controlled by an air
valve 68 in turn controlled by an electric switch 70. This switch
70 is shown in FIG. 5 and connected with conductor 46 referred to
above and a conductor 72.
In the operation of the device of FIGS. 1 to 5, the arms 16-26
assume a single zero position which may be upright as shown in
FIGS. 1 and 2. In such position the connector 18 is in engagement
with the switch arm 34 holding the switch 32 at NO position (FIG.
5) in which that portion of the circuit is open. In this same
position switch No. 2 is in NC position, and in this position this
portion of the circuit is also open.
In the movement of the piece along the conveyor means, the leading
edge 60a approaches the PE cell and the latter "sees" the leading
edge of the piece, causing a transfer in the relay 48, moving the
blade of the switch 50 over to contact No. 7 and starts the 60 RPM
motor 10. This motor swings the arm 16 at a corresponding rate, and
through the connector pin 18, swings the arm 26 therewith, the
overrunning clutch 24 functioning to permit the latter
movement.
As the arms move from their zero position, the connector 18 moves
beyond the switch blade 34 changing the switch No. 1 to its NC
position. At this point in the operation there is no change in the
circuit of FIG. 5.
The piece 60 to be folded continues moving along the conveyor, and
as the trailing edge 60b passes the PE cell 48, the switch means 50
(FIG. 5) is moved to its opposite position, completing circuit
through contact No. 8. This stops the 60 RPM motor 10 and starts
the 120 RPM motor 20, and the latter moves the arm 26 at a faster
rate, carrying the arm 26 therewith, the latter being moved at the
faster rate because of the overrunning clutch 14.
As the arms 26, 16 continue swinging in angular movement, the
connector 18 approaches the switch No. 2, the 120 RPM motor having
started before that time, and when it does reach that switch, the
connector pin actuates the arm 42 in the switch No. 2 (see FIG. 5),
moving the contact arm from its NC position to its NO position.
This latter position then energizes the folding knife mechanism
through the conductors 46, 72, as referred to above in connection
with FIG. 3. The folding knife 62 then moves through the gap 58 and
creases the piece 60 at the corresponding position (in this case,
the middle) and the piece is then gripped by the conveyor means 64
and correspondingly folded. The arms 26, 16 in further rotation
clear the arm 42 of the second switch 36, enabling the latter to
revert to its NC position of FIG. 5, and upon additional movement,
move up to the switch arm 34 of switch No. 1, and move it to its NO
position. The arms have completed a revolution, or cycle, and are
again in zero position from which they start in the next folding
operation.
In explanation of the operation of the folding step, it is to be
stated that the relationship between the leading edge of the piece
actuating a control element, such as a PE cell or a switch, and the
trailing edge actuating that same switch, determines the actuation
of the folding step at the desired point. In further explanation it
is to be stated that the sooner the trailing edge of the piece
actuates the control element in the cycle, the sooner will the
faster operating motor begin operating, whereby in the case of a
shorter piece, the faster operating motor will operate in a greater
portion of the cycle, and the longer the piece is, the lesser
portion of the cycle will the faster operating motor operate. The
consequence is that regardless of the length of the piece being
folded, the shorter the piece is, the longer in time will the
faster motor operate, and progressively in the opposite direction,
namely the longer in length the piece is the shorter period of time
will the higher speed motor operate.
The result is that the pieces to be folded can be fed into the
folder in random order, a long piece, a short piece, an
intermediate piece, etc. and they will all be folded at the desired
position, in the case referred to, in the middle. However, if the
pieces are to be folded at a position other than the middle, the
ratio of the speed of the motors is correspondingly changed,
according to whether the fold is to be made ahead of the middle, or
after the middle. The specific speeds of the motors are arbitrary,
so long as the desired ratio is maintained, but in the case of
folding the pieces in the middle the motors may be of 30 RPM and 60
RPM respectively, or 120 RPM and 240 RPM, respectively, etc.
It is also practical to utilize a single motor having dual speed
characteristics so that instead of operating two different motors
at different speeds, the single motor can be operated in the
different phases of the cycle at the correspondingly different
speeds.
FIG. 4 represents a form that may be utilized in place of that of
FIG. 3. In FIG. 4 the control element 48 is a switch 48b identified
above, and it has a finger 74 engageable by the piece 60. The
finger 74 when engaged by the piece is held in a deflected position
throughout the travel of the piece and after the trailing edge of
the piece passes the switch, the finger flicks back to its normal
position, with the consequence that while the piece is passing over
the switch 48b it has the same effect as if passing through the
beam of the PE cell 48a of FIG. 3.
FIGS. 6 to 9 show a modified form of the apparatus. In the present
arrangement, the same two motors, a low-speed and a high-speed
motor are utilized, but in this case there is no zero position, but
the beginning and terminating position, while the same, may be at
any random angular location, around the axis of the motor drive
shafts.
A low-speed or 60 RPM motor 80 is provided, having a drive shaft 82
on an axis 83, and a commutator 84 mounted on that drive shaft, the
commutator having rings 86 associated with brushes 88 (see also
FIG. 7). Mounted on the commutator adjacent the periphery thereof
is a switch 90 having a radial actuating finger 92. A high-speed or
120 RPM motor 93 is also provided, having a drive shaft 94 on the
same axis 83 as the shaft of the first motor. Mounted on the shaft
94 is an operating arm 96 having an axial pin or actuating element
98 positioned for engagement with the switch finger 92 at certain
times as explained hereinbelow.
FIG. 9 is a diagram of the circuit utilized in the present
arrangement. This diagram includes the rotating switch 90, and the
motors 80, 93. It also includes a relay 100 corresponding to the
relay 48 in the first form, and controlled by the movement of the
piece along the conveyors as represented in FIGS. 3 and 4.
Additionally the circuit includes a timer 102 of known kind, and a
selector switch 104.
In the operation of the device of FIGS. 6 to 9, a beginning
position is assumed in which the commutator 84 is in any random
position, with the switch 90 in a corresponding angular position,
e.g., the bottom, FIGS. 6 and 8, and in this same beginning
position, the operating arm 96 is in position adjacent thereto
(FIG. 8, full line position) in which the finger 98 is in
engagement with the switch finger 92, holding the switch as
represented in FIG. 9 with the switch blade in NO position. In this
position the switch 70 actuates the folding knife 62.
As the leading edge of the piece 60 (FIG. 3) moves to the PE cell,
the latter "sees" that edge, and as a consequence the relay is
moved from the contacts No. 5 and No. 8 to the contacts No. 4 and
No. 7. This causes the low-speed motor 80 to operate, rotating the
switch 90 away from the operating pin 98, as indicated by the
dot-dash line position of the switch in FIG. 8, and in that switch
the contact blade is moved from the NO contact to the NC contact,
whereby the knife is removed from its folding position. The timer
102 is also consequently energized, the timer having been
previously set according to a period of time for the leading edge
of the piece to move from the PE cell to the folding knife.
As the trailing edge of the piece passes the PE cell, the relay 100
is returned to No. 5 and No. 8, and consequently the slow-speed
motor 80 is brought to a stop, instantaneously because of internal
breaking function, as is included in the other motor 93 also. The
timer 102 and the circuit controlled thereby is held in ON position
through the NC contact in the switch 90.
As the leading edge of the piece passes the folding knife, the
timer 102 fires, according to its predetermined setting and its
timing characteristics relative to the movement of the piece along
the conveying means, so that as the leading edge passes the folding
knife, the high-speed motor 93 is energized, moving at twice the
speed of the low-speed motor. The operating arm 96 then traces the
same angular displacement as the rotating switch 90, but it does so
at twice the that the switch was moved. When the operating arm 96
reaches the switch 90, which is at that time stationary, the pin 98
engages the finger 92, changing the switch blade in the switch 90
back to the NO contact. This position of the arm 96 is shown in
dot-dash lines in FIG. 8, again in direct association with the
switch. This causes the timer 102 to transfer to contact No. 5
therein and thus stop the high-speed motor 93. The apparatus is
again in its beginning or idle position.
Thus the movement of the piece along the conveyor produces a timing
operation resulting in control of the first and low-speed motor,
and then the second and high-speed motor, whereby the latter
exercises its function at the end of a period which is one-half of
the period in which the low-speed motor moved, and thereby controls
the operation of the folding instrumentality at the midway portion
of the piece to be folded, as described above in connection with
the first form
When the pin 98 engages the switch finger 92 the operation of the
motors is brought to an abrupt halt. This may occur in any position
angularly about the axis 83 and accordingly the apparatus does not
have a fixed zero position.
In the event the piece is longer than the distance from the PE cell
to the folding knife, the same sequence will be followed except
that the timer 102 will fire before the low-speed motor has
stopped. This is a definite advantage in certain cases,
compensating for the variation in length of the piece and the
distance from the PE cell to the folding knife. This apparatus
(FIGS. 6 to 9) will function to both add and subtract and to do so
in connection with a single operation.
* * * * *