CA1043369A - Material folding machine - Google Patents
Material folding machineInfo
- Publication number
- CA1043369A CA1043369A CA248,924A CA248924A CA1043369A CA 1043369 A CA1043369 A CA 1043369A CA 248924 A CA248924 A CA 248924A CA 1043369 A CA1043369 A CA 1043369A
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- Canada
- Prior art keywords
- roll means
- folding roll
- folding
- sleeves
- set forth
- Prior art date
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- Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
Abstract
MATERIAL FOLDING MACHINE
Abstract of the Disclosure A folding machine for flat, flexible material having first folding roll and blade means for folding the material in eighths and delivering the eighth-folded material to additional folding roll and blade means which fold the material into thirty-seconds. The second folding roll and blade means includes a plurality of folding rolls, one of which is mounted for rotation about a fixed axis and is motor driven and drives the others through frictional engagement. The other folding rolls are mounted for movement toward and away from the motor driven folding roll to allow for passage of the material therebetween while retaining the frictional drive engagement with the motor driven folding roll.
Abstract of the Disclosure A folding machine for flat, flexible material having first folding roll and blade means for folding the material in eighths and delivering the eighth-folded material to additional folding roll and blade means which fold the material into thirty-seconds. The second folding roll and blade means includes a plurality of folding rolls, one of which is mounted for rotation about a fixed axis and is motor driven and drives the others through frictional engagement. The other folding rolls are mounted for movement toward and away from the motor driven folding roll to allow for passage of the material therebetween while retaining the frictional drive engagement with the motor driven folding roll.
Description
1 ~TERIAL rOLDI~G M~IIN~
3ackground of the Invention The present invention relates generally to improvements in material foldin~ machines, and more specifically relates to improvements in machines for folding laundry articles such as bed sheets and the like.
~xamples of such machines are shown in U.S. Patent 2,954,974 which issued to ~1. Kellett on October 4, 1960, and Great Britain Patent Specification 1,377,089 published December 11, 1974.
The basic concept of utilizing a pair of folding rolls and a blade to move the material between the rolls to obtain a fold such as is shown in the above-noted patents has proven successful as long as the thickness of the material and the number of folds has been kept at a minimum. However, as the number of folds is increased it has been found to be necessary to drive both of the foldine rolls in order to keep the multiple folds of the material moving evenly and smoothly.
Also, as the number of folds increased, the spacing between the pair of driven folding rolls became more critical and presented new problems.
For example, the total thickness of a bed sheet folded into sixteenths is substantially greater when the sheet is new as compared to when it is well used. The same can be true when comparine sheets of differ-ent material.
Summary of the Invention The principal ob~ect of the present invention is to provide a material foldine machine for making multiple folds which includes a sim-plified drive arrangement and which is not sensitive to normal variations in the thickness of the material being folded.
The principal obJect is accomplished by providing the folding machine with pairs of folding rolls, a first folding roll of each pair being unted for rotation about a fixed axis and being motor driven, the second 3 folding roll of each pair being mounted for individual movement of its opposite ends toward and away from the first folding roll. The second folding roll means is yieldably biased toward the first. Each of the ~043369 1 folding rolls is provided with at least three sleeves, first and second outer sleeves and one or more intermediate sleeves, which are mounted in alignment with the sleeves on the other roll. qhe first outer sleeve on each of the pair of folding rolls is mounted immediately ad~acent one end of its respective folding roll and the second outer sleeve on each of the pair of folding rolls is spaced from the other end of its respective folding roll. An oscillatable blade is mounted for move-ment into engage~ent with material located between the blade and a pair of folding rolls to move the material between the pinch points formed by the second outer and intermediate sleeves on the pair of folding rolls. As the material moves between the pair of folding rolls the yieldable bias on the second folding roll permits the second folding roll to move away from the first and provide room between the sleeves for the material. Since the opposite ends of the second folding roll are individually movable and the material is introduced only between the second outer and the intermediate sleeves, the bias on the second folding roll maintains the first outer sleeves in contact with each other 50 the second folding roll is driven by the first folding roll through frictional drivine engagement of the sleeves.
~he above ob~ect and additional ob~ects and advantages of the present invention will become apparent to those skilled in the art from a reading of the following detailed description of a preferred em-bodlment of the invention when read in con~unction with the accompanying drawin65~
Brief DescriPtion Or the Drawings In the drawings:
FiB. 1 i9 a vertical sectional view of a folding machine constructed in accordance with the principles of the present invention;
Figs. 2-6 are diagramatic sectional views showing successive folding functions produced by the folding machine illustrated in Fig. l;
Fig. 7 is a sectional view taken substantially along the lines 7-7 of Fig. l; and 1~)43369 1 Fig. 8 is a sectional view taken substantially alon~ the lines 8-8 of Fig. 1.
Description of a ~referred ~mbodi~.ent Referring to the dra~ings, sides 10 of a frame rotatably support transversely extending front and rear rolls 12 and 14 about which are trained a plurality of spaced, endless, flexible belts 16. Rolls 12 and 14 and belts 16 form a first conveyor. The front roll 12 is driven by a motor lô through an endless belt 20 which is trained about pulleys 22 and 24 secured to the motor shaft and to roll 12 respectively. A bed 26 for the conveyor extends between the sides 10 of the frame and is positioned just beneath the upper reaches of the endless belts 16 to provide support therefore. A switch 28 is mounted to the bottom side of the bed 26 and includes an actuating finger 30 which extends upwardly through a suitable opening provided in the bed and passes between a pair of the belts 16. The purpose of the switch will be explained here-ina M er.
A rod 32 extends between the sides 10 of the frame above the con-veyor, and a plurality of arms 34 (only one shown) each have one end pivotally mounted on the rod 32. Each pair of arms 34 rotatably supports one or more short gripping rolls 36 which rest on the front conveyor roll 12.
m e rear conveyor roll 14 and a roll 38 form a pair of quarter-fold rolls. The roll 38 is rotatably supported beneath the roll 14 by a pair of arms 40 pivotally mounted on the sides 10 as at 42. A tension sprin~ 44 is anchored to each of the arms 40 and the respective side 10 and biases its respective arm 40 about the pivot 42 to bring the roll 38 into engagement with the roll 14. The roll 38 consists of a plurality of spaced sleeves 46 mounted on a central sha M 48.
A cuarter-fold oscillatable blade assembly indicated generally at 50 completes the quarter-fold portion of the machine. The quarter-fold blade assembly includes a pair of arms 52 interconnected at one end by a rod 54 and pivotally mounted on the sides 10 at their opposite ends.
1 Spaced blades 56 are secured to the rod 54 for movement between the sleeves 46 as the arms 52 pivot toward the roll 38. A reversible motor 58 mounted on a side 10 is secured to one of the arms 52 and controls the movement of the quarter-f~ld blade asse~bly. The quarter-fold blade assembly moves, under the control of the motor 58, between a forward position illustrated in Fi~. 1 to a rearward position illustrated in Figs. 3 and 4 in which it engaees a bumper 60 on the -ear wall 62 of the frame. A stop member 64 limits the forward movement of the quarter-fold blade assembly.
A pair of rolls 66 and 68 form a pair of eighth-fold rolls which are mounted on the frame in a position offset from the egress side of the quarter-fold rolls and at a level lower than the quarter-fold rolls.
The roll 66 is mounted for rotation about a fixed axis 70 and is driven in a manner to be explained hereinafter. The roll 68, like the roll 38, consists of a plurality of spaced sleeves 72 mounted on a central shaft 74. me opposite ends of the shaft 74 are rotatably mounted on arms 76 which are pivotally mounted on the sides 10 by pins 78. The weight of the roll 68 normally keeps it in engagement with the roll 66.
An eighth-fold oscillatable blade assembly indicated eenerally at 80 completes the eighth-fold portion of the machine. The eighth-fold blade s6sembly includes a pair of arms 82 interconnected at one end by a rod 84 and pivotally mounted on the sides 10 at their opposite end~. Spaced blades 86 are secured to the rod 84 for movement between the sleeves 72 as the arms 82 pivot toward the roll 68. A reversible motor 88 mounted on one of the sides 10 is secured to one of the arms 82 and controls the movement of the eighth-rold blade assembly between a forward position against a stop 90 as illustrated in Fig. 1 and a rearward position against the stop 64 illustrated in Fig. 5.
The operation of the folding machine so far described is essentially as follows: the machine operator will place the leading edge of a sheet 92 between the conveyor roll 12 and gripper rolls 36. This can be iQ~;~369 1 done by two operators or by a single opera.tor. ~he ma.chine is then started and rot.ation of the driven roll 12 causes the sheet to be pulled between the rolls 12 and 36 and ~oved down the first conveyor toward the quarter-fold portion of the machine as shown in Fig. 1. When the sheet engages the finger 30 the switch 28 is actuated to start a timer r.echanism. The timer mechanism ner se does not form a part of the present invention and can be any conventional timer mechanism.
When a desired portion of the sheet, approximately one-quarter thereof, has dropped over the end of the first conveyor and passed by the rear edge of the blades 56 as indicated at 92a in Fir. 2, the timer mechanism starts the reversible motor 58 to pivot the blade assembly 50 rearwardly so as to engage the sheet between the rear of the blades 56 and the bumper 60 as shown in Fig. 3. As the sheet continues to move off the first conveyor it drapes downwardly to form portions 92b and 92c as shown in Fig. 4. When the sheet portions 92b and c are each approximately one-quarter of the entire sheet and the portion 92d of the sheet remaining on the first conveyor is also approximately one-guarter of the entire sheet as shown iD Fig. 4, the timer mechanism again starts the reversible motor 58 to pivot the blade assembly forward . 20 as shown in Fig. 5. When the blade mechanism pivots forwardly the blades 56 engage the sheet and force it into the pinch points between the roll 14 and sleeves 46 so that rotation of the rolls 14 and 38 pulls the four sections of the sheet between the rolls to provide the quarter-fold as can be seen in Fig. 5.
When the timing mechanism starts the reversible motor 58 to pivot the blade assembly 50 forward it also starts the reverslble motor 88 to pivot the blade assembly 80 of the eighth-fold portion of the machine rearwardly as shown in Fig. 5. When approximately one-half of the quarter-folded sheet has passed by the blades 86, the tir.er rechanism again starts the reversible motor 88 to pivot the blade assembly 80 forward. The blades 86 engaee the quarter-folded sheet approximately at the middle of the quarter panels and 10433~9 1 force it into the pinch points between the roll 66 and sleeves 72 so that rotation of the rolls 66 and 68 pulls the eight sections of the sheet between the rolls 66 and 6B to provide the eighth-fold as can be seen in Fig. 6.
A cross-fold portion of the machine provides two additional folding functions which fold the sheet 92 into sixteenths and thirty-seconds.
The cross-fold portion Or the machine includes a second conveyor ~ade of the roll 66, a roll 93 and a plurality of spaced, endless, flexible belts 94 trained about the rolls 66 and 93. The roll 93 is rotatably mounted on the sides 10 and is driven by a motor 96 through an endless n exible belt 9B trained about pulleys 100 and 102 on motor shaft and roll 93 respectively. Rotation of the roll 93 provides the hereinbefore mentioned rotation of the roll 66 through the belts 94.
A bed 104 for the second conveyor extends between the sides 10 of the frame and is positioned ~ust beneath the upper reaches of the endless belts 94. As can best be seen in Figs. 7 and ô, the bed 104 is provided with an elongated opening 106 which extends substantially parallel to the direction of vement of the second conveyor. A
switQh 108 is mounted to the underside of the bed 104 and includes an actuation finger 110 which extends upwardly through the opening 106 and between the belts 94. A stop bar 111 extends between the sides 10 and i~ positioned ~ust above the belts 94 ad~acent to the discharge end of the second conveyor.
A roll support frame depends from the bed 104 and includes a pair of side walls 112 and 114 interconnected by a bottom wall 116.
A pair Or sixteenth-fold rolls 118 and 120 are mounted between the side walls 112 and 114 in side-by-side relatior.ship with their axes substantially parallel to the direction of movement of the conveyor and with the pinch point between the two rolls substantially centered with respect to the opening 106.
The roll 118 is mounted for rotation about a fixed axis and driven by a motor 122. The drive from the motor 122 to the roll llô includes 1 a Jackshaft 124 which is driven by the motor 122 through an endless flexible belt 126 trained about pulleys 128 and 130 mounted on the motor shaft and ~ackshaft respectively. he ~ackshaft, in turn, drives the roll 118 through an endless flexible belt 132 trained about pulleys 134 and 136 mounted on the ~ackshaft and roll respectively.
The roll 120 has its opposite ends rotatably mounted on the ends of a pair of arms 138 which are pivotally mounted intermediate their ends to the side walls 112 and 114 by pins 140. The roll 120 is loosely ~ounted on the arms 138 or is mounted through universal Journals so that the opposite ends of the roll 120 can move relative to each other and the roll 120 can assume a canted position with re-spect to the roll 118. A spring 142 is anchored to the free ends of each of the arms 138 and to the respective side wall 112 and 114 and acts on the arm 138 to bias the roll 120 toward and into engaeement with the roll 118. For reasons to become more apparent hereinafter, the spring 142 anchored to the side waIl 112 is stron~er or has a greater spring rate than the spring 142 anchored to the side wall 114.
Fach of the rolls 118 and 120 is provided with a first outer sleeve 144, a second outer sleeve 146 and an intermediate sleeve 148.
The first outer sleeve 144 on each of the rolls 118 and 120 is positioned at the extreme end of its respective roll ad~acent the side wall 112; each of the second outer sleeves 146 is spaced from the end of its respective roll ad~acent the side wall 114; and the intermediate sleeves 148 are positioned substantially midway between the outer sleeves. For reasons to become more apparent hereinafter, the internediate sleeve on at least the roll 120 has a smaller diameter than the outer sleeves thereon.
A sixteenth-fold oscillatable blade assemhly indicated eenerally at 150 includes a pair of arms 152 interconnected by a rod 154 at one end and pivotally mounted on brackets 156 at their opposite ends.
The brackets 156 are secured to a pair of spaced rails 158 extending between the sides 10 above the second conveyor. A plurality of spaced 1 blades 160 are secured to the rod 154 for moverent between the sleeves 144-148 on the rolls 118 and 120 ~hen the blade assembly pivots down-wardlv, A reversible motor 162 is ~ounted on one of the rails 158 and connected to one of the arms 152 to pivot the blade asse~bly be-tween an upper position in ~hich the arms 152 engave bu~pers 164 on the rails 158 and a lower position in ~hich the blades 160 extend between the sleeves 144-148. LiFht springs 166 act between the ar~s 152 and rails 158 to aid the motor 162 in pivoting the blade assembly to its upper position.
The roll 118 and a roll 168 for~ a pair of thirty-second-fold rolls.
The opposite ends of roll 168 are rotatably mounted on a pair of arms 170 which are pivotally mounted on the sides 112 and 114 by the pins 140. The roll 120 is loosely mounted on the arms 170 or is unted thereon throup,h universal ~ournals so that the opposite ends of the roll 168 can move relative to each other and the roll 168 can assume a canted position with respect to the roll 118. A spring 172 is anchored to the free end of each of the arms 170 and to the re-spective side wall 112 and 114 and acts on the ar~ 138 to bias the roll 168 toward and into engagement with the roll 118. For reasons to 20 become more apparent hereinafter, the sprinE 172 anchored to the side wall 112 is stronger or has a greater spring rate than the spring 172 anchored to the side wall 114.
The roll 168 is provided with three sleeves 144-148 corresponding to the three sleeves 144-148 on the roll 118. The intermediate sleeve 148 on the roll 16B is of a reduced diameter with respect to the outer sleeves 144 and 146 thereon for reasons to become apparent hereinafter.
A stop block 174 is mounted on the side wall 114 in the path of vement of the arm 170 pivoted to the wall 114 so that engagement be-tween the stop block 174 and arm 170 will prevent eneagement between the sleeves 144 on the rolls 118 and 168.
A thirty-second-fold oscillatable blade assembly indicated ~enerally at 176 includes a pair of arms 178 interconnected at one end by a rod 180 ~043369 1 and pivotally mounted at their opposite ends to the side walls 112 and 114. A plurality of spaced blades 182 are secured to the rod 180 for moverent between the sleeves 144-148 on the rolls 118 and 168 when the blade assembly pivots toward the rolls 118 and 168. A reversible motor 184 is mounted on the side wall 112 throuph a bracket 186 and is connected to one of the arms 178 to pivot the blade assemhly between a normal position illustrated in Figs. 7 and o and a position in which the blades 182 extend between the sleeves 144-148 on rolls 118 and 168.
The operation Or the cross-fold portion Or the machine is as follows: when the sheet, folded into eight panels, emerges from between the rolls 66 and 68, it is moved toward the front of the machine by the second conveyor. After a predetermined time, the timer mechanism will activate the reversible motor 162 to pivot the blade assembly 150 downwardly. The timer mechanism &llows sufficient time for the sheet 92 to move into engagement with the stop bar 111. As the sheet moves toward the stop bar 111 it engaees the fineer 110 of switch 108 to open the switch which is wired in the circuit for the motor 162. This in-sures that the motor 162 cannot be activated until the trailing ed~e Or the sheet has moved past the finger 110 and the sleeves 144 on the rolls 118, 120 and 168.
As the blade assembly 150 pivots downwardly, the blades 160 engn~e the sheet r.idway between its ends and force the sheet downwardly throuFh the openine 106 and into the pinch point between the sleeves 146 and 148 on the rolls 118 and 120. As the sheet moves between the rolls 118 and 120 it is folded into sixteenths. The arm 138 which is pivoted to the side uall 114 permits the one end of the roll 120 to be forced away fro~. the roll 118 so there is a sufficient F~ap between the sleeves 146 and 148 on the rolls 118 and 120 to allow the sheet to be moved therebetween. The stronger sprin~ on the arm 138 pivoted to the side 3 112 helps insure that the sleeves 144 on the rolls 118 and 120 remain in driving eneaeement so that sleeves 146 and 148 on both of the rolls 118 and 120 pull the sheet therebetween. As the roll 120 assumes a 1~)43369 l canted position with respect to the roll 118 due to movernent of the ar~ 138 pivoted to the side wall 114, the ~ap between the sleeves 146 r~rows at a faster rate than the r-ap between the sleeves l48 and therefore, when the roll 120 reaches its fully canted position, as deterrined by the thickness of the sixteen panels of the sheet, the gar between the sleeves 146 will be substantially equal to the gap between the sleeves 148 due to the reduced diameter of the sleeve l48 on the roll 120.
~ 1hen approximately one-half of the sheet has been drawn between the rolls 118 and 120 and has r.oved past the blades 182 of the thirty-second-fold blade asserbly 176 as illustrated in Figs. 7 and 8, the timer ~echanism activates the reversible motor 184 to pivot the blade asserbly 176 to the left as viewed in Fie. 7 so that the blades 182 engage the sheet and rove it into the pinch points formed by the sleeves 146 and 148 on the rolls 118 and 168. T~e stop 174 rsintains a gap between the sleeves 146 on the rolls 118 and 168 so that the substantial thickness of thirty-two panels of the sheet does not interfere with the initial rDvement of the sheet between the rolls 118 and 168.
In exactly the sarle ranner as explained above for the roll 120, movement of the sheet 92 between the rolls 118 and 168 causes the roll 168 to assume a canted position with respect to the roll 118, but the sleeves 144 on the rolls 118 and 168 always remain in driving engage-ment. Also, due to the reduced diameter of the sleeve 148 on the roll 168, the gap between the sleeves 146 will be substantially equal to the gap between the sleeves 148 when the roll 168 assumes the canted position determined by the thickness Or the thirty-two sheet panels.
Freferably the diameter of the sleeve 148 on the roll 168 is smaller than the diareter of the ~leeve 146 by an arount substantially equal to the distance between the sleeves 146 on the rolls 118 and 168 when the arm 170 is in engagement with the stop block 174.
~1hen the sheet 92, folded into thirty-two panels, emer~es from between the rolls 118 and 168, it is deposited on a slide 188 which delivers the folded sheet to the front of the machine.
-- 10 _ 1~143369 hen the timer mecilanism is restarted by a new sheet en~a~in~ the finger 30 of the switch 28, the various blade assemblies will be ret~rned to their original positions.
If desired, the reversible rotor 184 can be optionally activated simultQneously with the motor 162 so that, as the sheet ererges fror between the rolls 118 and 120, it en~ages the blades 182 and i~mediately moves between the rolls 118 and 168. This, in effect, bypasses the thirty-second fold portion of the rachine.
From the foregoine it can be seen that the present invention pro-vides a raterial folding machine which provides rultiple folds, whichis not sensitive to normal variations in the thickness of the material to be folded and includes a simplified reliable drive arrangement.
~ laving thus described a single preferred erbodirent of the inven-tion various modifications within the spirit and scope of the invention will beco~e apparent to those skilled in the art, and these obvious rodif-ications can be incorporated into the invention without departing from the principles of the invention. Therefore, the invention should not be limited to the specific illustrations and descriptions, but only to the reasonable scope of the followine claims.
3o
3ackground of the Invention The present invention relates generally to improvements in material foldin~ machines, and more specifically relates to improvements in machines for folding laundry articles such as bed sheets and the like.
~xamples of such machines are shown in U.S. Patent 2,954,974 which issued to ~1. Kellett on October 4, 1960, and Great Britain Patent Specification 1,377,089 published December 11, 1974.
The basic concept of utilizing a pair of folding rolls and a blade to move the material between the rolls to obtain a fold such as is shown in the above-noted patents has proven successful as long as the thickness of the material and the number of folds has been kept at a minimum. However, as the number of folds is increased it has been found to be necessary to drive both of the foldine rolls in order to keep the multiple folds of the material moving evenly and smoothly.
Also, as the number of folds increased, the spacing between the pair of driven folding rolls became more critical and presented new problems.
For example, the total thickness of a bed sheet folded into sixteenths is substantially greater when the sheet is new as compared to when it is well used. The same can be true when comparine sheets of differ-ent material.
Summary of the Invention The principal ob~ect of the present invention is to provide a material foldine machine for making multiple folds which includes a sim-plified drive arrangement and which is not sensitive to normal variations in the thickness of the material being folded.
The principal obJect is accomplished by providing the folding machine with pairs of folding rolls, a first folding roll of each pair being unted for rotation about a fixed axis and being motor driven, the second 3 folding roll of each pair being mounted for individual movement of its opposite ends toward and away from the first folding roll. The second folding roll means is yieldably biased toward the first. Each of the ~043369 1 folding rolls is provided with at least three sleeves, first and second outer sleeves and one or more intermediate sleeves, which are mounted in alignment with the sleeves on the other roll. qhe first outer sleeve on each of the pair of folding rolls is mounted immediately ad~acent one end of its respective folding roll and the second outer sleeve on each of the pair of folding rolls is spaced from the other end of its respective folding roll. An oscillatable blade is mounted for move-ment into engage~ent with material located between the blade and a pair of folding rolls to move the material between the pinch points formed by the second outer and intermediate sleeves on the pair of folding rolls. As the material moves between the pair of folding rolls the yieldable bias on the second folding roll permits the second folding roll to move away from the first and provide room between the sleeves for the material. Since the opposite ends of the second folding roll are individually movable and the material is introduced only between the second outer and the intermediate sleeves, the bias on the second folding roll maintains the first outer sleeves in contact with each other 50 the second folding roll is driven by the first folding roll through frictional drivine engagement of the sleeves.
~he above ob~ect and additional ob~ects and advantages of the present invention will become apparent to those skilled in the art from a reading of the following detailed description of a preferred em-bodlment of the invention when read in con~unction with the accompanying drawin65~
Brief DescriPtion Or the Drawings In the drawings:
FiB. 1 i9 a vertical sectional view of a folding machine constructed in accordance with the principles of the present invention;
Figs. 2-6 are diagramatic sectional views showing successive folding functions produced by the folding machine illustrated in Fig. l;
Fig. 7 is a sectional view taken substantially along the lines 7-7 of Fig. l; and 1~)43369 1 Fig. 8 is a sectional view taken substantially alon~ the lines 8-8 of Fig. 1.
Description of a ~referred ~mbodi~.ent Referring to the dra~ings, sides 10 of a frame rotatably support transversely extending front and rear rolls 12 and 14 about which are trained a plurality of spaced, endless, flexible belts 16. Rolls 12 and 14 and belts 16 form a first conveyor. The front roll 12 is driven by a motor lô through an endless belt 20 which is trained about pulleys 22 and 24 secured to the motor shaft and to roll 12 respectively. A bed 26 for the conveyor extends between the sides 10 of the frame and is positioned just beneath the upper reaches of the endless belts 16 to provide support therefore. A switch 28 is mounted to the bottom side of the bed 26 and includes an actuating finger 30 which extends upwardly through a suitable opening provided in the bed and passes between a pair of the belts 16. The purpose of the switch will be explained here-ina M er.
A rod 32 extends between the sides 10 of the frame above the con-veyor, and a plurality of arms 34 (only one shown) each have one end pivotally mounted on the rod 32. Each pair of arms 34 rotatably supports one or more short gripping rolls 36 which rest on the front conveyor roll 12.
m e rear conveyor roll 14 and a roll 38 form a pair of quarter-fold rolls. The roll 38 is rotatably supported beneath the roll 14 by a pair of arms 40 pivotally mounted on the sides 10 as at 42. A tension sprin~ 44 is anchored to each of the arms 40 and the respective side 10 and biases its respective arm 40 about the pivot 42 to bring the roll 38 into engagement with the roll 14. The roll 38 consists of a plurality of spaced sleeves 46 mounted on a central sha M 48.
A cuarter-fold oscillatable blade assembly indicated generally at 50 completes the quarter-fold portion of the machine. The quarter-fold blade assembly includes a pair of arms 52 interconnected at one end by a rod 54 and pivotally mounted on the sides 10 at their opposite ends.
1 Spaced blades 56 are secured to the rod 54 for movement between the sleeves 46 as the arms 52 pivot toward the roll 38. A reversible motor 58 mounted on a side 10 is secured to one of the arms 52 and controls the movement of the quarter-f~ld blade asse~bly. The quarter-fold blade assembly moves, under the control of the motor 58, between a forward position illustrated in Fi~. 1 to a rearward position illustrated in Figs. 3 and 4 in which it engaees a bumper 60 on the -ear wall 62 of the frame. A stop member 64 limits the forward movement of the quarter-fold blade assembly.
A pair of rolls 66 and 68 form a pair of eighth-fold rolls which are mounted on the frame in a position offset from the egress side of the quarter-fold rolls and at a level lower than the quarter-fold rolls.
The roll 66 is mounted for rotation about a fixed axis 70 and is driven in a manner to be explained hereinafter. The roll 68, like the roll 38, consists of a plurality of spaced sleeves 72 mounted on a central shaft 74. me opposite ends of the shaft 74 are rotatably mounted on arms 76 which are pivotally mounted on the sides 10 by pins 78. The weight of the roll 68 normally keeps it in engagement with the roll 66.
An eighth-fold oscillatable blade assembly indicated eenerally at 80 completes the eighth-fold portion of the machine. The eighth-fold blade s6sembly includes a pair of arms 82 interconnected at one end by a rod 84 and pivotally mounted on the sides 10 at their opposite end~. Spaced blades 86 are secured to the rod 84 for movement between the sleeves 72 as the arms 82 pivot toward the roll 68. A reversible motor 88 mounted on one of the sides 10 is secured to one of the arms 82 and controls the movement of the eighth-rold blade assembly between a forward position against a stop 90 as illustrated in Fig. 1 and a rearward position against the stop 64 illustrated in Fig. 5.
The operation of the folding machine so far described is essentially as follows: the machine operator will place the leading edge of a sheet 92 between the conveyor roll 12 and gripper rolls 36. This can be iQ~;~369 1 done by two operators or by a single opera.tor. ~he ma.chine is then started and rot.ation of the driven roll 12 causes the sheet to be pulled between the rolls 12 and 36 and ~oved down the first conveyor toward the quarter-fold portion of the machine as shown in Fig. 1. When the sheet engages the finger 30 the switch 28 is actuated to start a timer r.echanism. The timer mechanism ner se does not form a part of the present invention and can be any conventional timer mechanism.
When a desired portion of the sheet, approximately one-quarter thereof, has dropped over the end of the first conveyor and passed by the rear edge of the blades 56 as indicated at 92a in Fir. 2, the timer mechanism starts the reversible motor 58 to pivot the blade assembly 50 rearwardly so as to engage the sheet between the rear of the blades 56 and the bumper 60 as shown in Fig. 3. As the sheet continues to move off the first conveyor it drapes downwardly to form portions 92b and 92c as shown in Fig. 4. When the sheet portions 92b and c are each approximately one-quarter of the entire sheet and the portion 92d of the sheet remaining on the first conveyor is also approximately one-guarter of the entire sheet as shown iD Fig. 4, the timer mechanism again starts the reversible motor 58 to pivot the blade assembly forward . 20 as shown in Fig. 5. When the blade mechanism pivots forwardly the blades 56 engage the sheet and force it into the pinch points between the roll 14 and sleeves 46 so that rotation of the rolls 14 and 38 pulls the four sections of the sheet between the rolls to provide the quarter-fold as can be seen in Fig. 5.
When the timing mechanism starts the reversible motor 58 to pivot the blade assembly 50 forward it also starts the reverslble motor 88 to pivot the blade assembly 80 of the eighth-fold portion of the machine rearwardly as shown in Fig. 5. When approximately one-half of the quarter-folded sheet has passed by the blades 86, the tir.er rechanism again starts the reversible motor 88 to pivot the blade assembly 80 forward. The blades 86 engaee the quarter-folded sheet approximately at the middle of the quarter panels and 10433~9 1 force it into the pinch points between the roll 66 and sleeves 72 so that rotation of the rolls 66 and 68 pulls the eight sections of the sheet between the rolls 66 and 6B to provide the eighth-fold as can be seen in Fig. 6.
A cross-fold portion of the machine provides two additional folding functions which fold the sheet 92 into sixteenths and thirty-seconds.
The cross-fold portion Or the machine includes a second conveyor ~ade of the roll 66, a roll 93 and a plurality of spaced, endless, flexible belts 94 trained about the rolls 66 and 93. The roll 93 is rotatably mounted on the sides 10 and is driven by a motor 96 through an endless n exible belt 9B trained about pulleys 100 and 102 on motor shaft and roll 93 respectively. Rotation of the roll 93 provides the hereinbefore mentioned rotation of the roll 66 through the belts 94.
A bed 104 for the second conveyor extends between the sides 10 of the frame and is positioned ~ust beneath the upper reaches of the endless belts 94. As can best be seen in Figs. 7 and ô, the bed 104 is provided with an elongated opening 106 which extends substantially parallel to the direction of vement of the second conveyor. A
switQh 108 is mounted to the underside of the bed 104 and includes an actuation finger 110 which extends upwardly through the opening 106 and between the belts 94. A stop bar 111 extends between the sides 10 and i~ positioned ~ust above the belts 94 ad~acent to the discharge end of the second conveyor.
A roll support frame depends from the bed 104 and includes a pair of side walls 112 and 114 interconnected by a bottom wall 116.
A pair Or sixteenth-fold rolls 118 and 120 are mounted between the side walls 112 and 114 in side-by-side relatior.ship with their axes substantially parallel to the direction of movement of the conveyor and with the pinch point between the two rolls substantially centered with respect to the opening 106.
The roll 118 is mounted for rotation about a fixed axis and driven by a motor 122. The drive from the motor 122 to the roll llô includes 1 a Jackshaft 124 which is driven by the motor 122 through an endless flexible belt 126 trained about pulleys 128 and 130 mounted on the motor shaft and ~ackshaft respectively. he ~ackshaft, in turn, drives the roll 118 through an endless flexible belt 132 trained about pulleys 134 and 136 mounted on the ~ackshaft and roll respectively.
The roll 120 has its opposite ends rotatably mounted on the ends of a pair of arms 138 which are pivotally mounted intermediate their ends to the side walls 112 and 114 by pins 140. The roll 120 is loosely ~ounted on the arms 138 or is mounted through universal Journals so that the opposite ends of the roll 120 can move relative to each other and the roll 120 can assume a canted position with re-spect to the roll 118. A spring 142 is anchored to the free ends of each of the arms 138 and to the respective side wall 112 and 114 and acts on the arm 138 to bias the roll 120 toward and into engaeement with the roll 118. For reasons to become more apparent hereinafter, the spring 142 anchored to the side waIl 112 is stron~er or has a greater spring rate than the spring 142 anchored to the side wall 114.
Fach of the rolls 118 and 120 is provided with a first outer sleeve 144, a second outer sleeve 146 and an intermediate sleeve 148.
The first outer sleeve 144 on each of the rolls 118 and 120 is positioned at the extreme end of its respective roll ad~acent the side wall 112; each of the second outer sleeves 146 is spaced from the end of its respective roll ad~acent the side wall 114; and the intermediate sleeves 148 are positioned substantially midway between the outer sleeves. For reasons to become more apparent hereinafter, the internediate sleeve on at least the roll 120 has a smaller diameter than the outer sleeves thereon.
A sixteenth-fold oscillatable blade assemhly indicated eenerally at 150 includes a pair of arms 152 interconnected by a rod 154 at one end and pivotally mounted on brackets 156 at their opposite ends.
The brackets 156 are secured to a pair of spaced rails 158 extending between the sides 10 above the second conveyor. A plurality of spaced 1 blades 160 are secured to the rod 154 for moverent between the sleeves 144-148 on the rolls 118 and 120 ~hen the blade assembly pivots down-wardlv, A reversible motor 162 is ~ounted on one of the rails 158 and connected to one of the arms 152 to pivot the blade asse~bly be-tween an upper position in ~hich the arms 152 engave bu~pers 164 on the rails 158 and a lower position in ~hich the blades 160 extend between the sleeves 144-148. LiFht springs 166 act between the ar~s 152 and rails 158 to aid the motor 162 in pivoting the blade assembly to its upper position.
The roll 118 and a roll 168 for~ a pair of thirty-second-fold rolls.
The opposite ends of roll 168 are rotatably mounted on a pair of arms 170 which are pivotally mounted on the sides 112 and 114 by the pins 140. The roll 120 is loosely mounted on the arms 170 or is unted thereon throup,h universal ~ournals so that the opposite ends of the roll 168 can move relative to each other and the roll 168 can assume a canted position with respect to the roll 118. A spring 172 is anchored to the free end of each of the arms 170 and to the re-spective side wall 112 and 114 and acts on the ar~ 138 to bias the roll 168 toward and into engagement with the roll 118. For reasons to 20 become more apparent hereinafter, the sprinE 172 anchored to the side wall 112 is stronger or has a greater spring rate than the spring 172 anchored to the side wall 114.
The roll 168 is provided with three sleeves 144-148 corresponding to the three sleeves 144-148 on the roll 118. The intermediate sleeve 148 on the roll 16B is of a reduced diameter with respect to the outer sleeves 144 and 146 thereon for reasons to become apparent hereinafter.
A stop block 174 is mounted on the side wall 114 in the path of vement of the arm 170 pivoted to the wall 114 so that engagement be-tween the stop block 174 and arm 170 will prevent eneagement between the sleeves 144 on the rolls 118 and 168.
A thirty-second-fold oscillatable blade assembly indicated ~enerally at 176 includes a pair of arms 178 interconnected at one end by a rod 180 ~043369 1 and pivotally mounted at their opposite ends to the side walls 112 and 114. A plurality of spaced blades 182 are secured to the rod 180 for moverent between the sleeves 144-148 on the rolls 118 and 168 when the blade assembly pivots toward the rolls 118 and 168. A reversible motor 184 is mounted on the side wall 112 throuph a bracket 186 and is connected to one of the arms 178 to pivot the blade assemhly between a normal position illustrated in Figs. 7 and o and a position in which the blades 182 extend between the sleeves 144-148 on rolls 118 and 168.
The operation Or the cross-fold portion Or the machine is as follows: when the sheet, folded into eight panels, emerges from between the rolls 66 and 68, it is moved toward the front of the machine by the second conveyor. After a predetermined time, the timer mechanism will activate the reversible motor 162 to pivot the blade assembly 150 downwardly. The timer mechanism &llows sufficient time for the sheet 92 to move into engagement with the stop bar 111. As the sheet moves toward the stop bar 111 it engaees the fineer 110 of switch 108 to open the switch which is wired in the circuit for the motor 162. This in-sures that the motor 162 cannot be activated until the trailing ed~e Or the sheet has moved past the finger 110 and the sleeves 144 on the rolls 118, 120 and 168.
As the blade assembly 150 pivots downwardly, the blades 160 engn~e the sheet r.idway between its ends and force the sheet downwardly throuFh the openine 106 and into the pinch point between the sleeves 146 and 148 on the rolls 118 and 120. As the sheet moves between the rolls 118 and 120 it is folded into sixteenths. The arm 138 which is pivoted to the side uall 114 permits the one end of the roll 120 to be forced away fro~. the roll 118 so there is a sufficient F~ap between the sleeves 146 and 148 on the rolls 118 and 120 to allow the sheet to be moved therebetween. The stronger sprin~ on the arm 138 pivoted to the side 3 112 helps insure that the sleeves 144 on the rolls 118 and 120 remain in driving eneaeement so that sleeves 146 and 148 on both of the rolls 118 and 120 pull the sheet therebetween. As the roll 120 assumes a 1~)43369 l canted position with respect to the roll 118 due to movernent of the ar~ 138 pivoted to the side wall 114, the ~ap between the sleeves 146 r~rows at a faster rate than the r-ap between the sleeves l48 and therefore, when the roll 120 reaches its fully canted position, as deterrined by the thickness of the sixteen panels of the sheet, the gar between the sleeves 146 will be substantially equal to the gap between the sleeves 148 due to the reduced diameter of the sleeve l48 on the roll 120.
~ 1hen approximately one-half of the sheet has been drawn between the rolls 118 and 120 and has r.oved past the blades 182 of the thirty-second-fold blade asserbly 176 as illustrated in Figs. 7 and 8, the timer ~echanism activates the reversible motor 184 to pivot the blade asserbly 176 to the left as viewed in Fie. 7 so that the blades 182 engage the sheet and rove it into the pinch points formed by the sleeves 146 and 148 on the rolls 118 and 168. T~e stop 174 rsintains a gap between the sleeves 146 on the rolls 118 and 168 so that the substantial thickness of thirty-two panels of the sheet does not interfere with the initial rDvement of the sheet between the rolls 118 and 168.
In exactly the sarle ranner as explained above for the roll 120, movement of the sheet 92 between the rolls 118 and 168 causes the roll 168 to assume a canted position with respect to the roll 118, but the sleeves 144 on the rolls 118 and 168 always remain in driving engage-ment. Also, due to the reduced diameter of the sleeve 148 on the roll 168, the gap between the sleeves 146 will be substantially equal to the gap between the sleeves 148 when the roll 168 assumes the canted position determined by the thickness Or the thirty-two sheet panels.
Freferably the diameter of the sleeve 148 on the roll 168 is smaller than the diareter of the ~leeve 146 by an arount substantially equal to the distance between the sleeves 146 on the rolls 118 and 168 when the arm 170 is in engagement with the stop block 174.
~1hen the sheet 92, folded into thirty-two panels, emer~es from between the rolls 118 and 168, it is deposited on a slide 188 which delivers the folded sheet to the front of the machine.
-- 10 _ 1~143369 hen the timer mecilanism is restarted by a new sheet en~a~in~ the finger 30 of the switch 28, the various blade assemblies will be ret~rned to their original positions.
If desired, the reversible rotor 184 can be optionally activated simultQneously with the motor 162 so that, as the sheet ererges fror between the rolls 118 and 120, it en~ages the blades 182 and i~mediately moves between the rolls 118 and 168. This, in effect, bypasses the thirty-second fold portion of the rachine.
From the foregoine it can be seen that the present invention pro-vides a raterial folding machine which provides rultiple folds, whichis not sensitive to normal variations in the thickness of the material to be folded and includes a simplified reliable drive arrangement.
~ laving thus described a single preferred erbodirent of the inven-tion various modifications within the spirit and scope of the invention will beco~e apparent to those skilled in the art, and these obvious rodif-ications can be incorporated into the invention without departing from the principles of the invention. Therefore, the invention should not be limited to the specific illustrations and descriptions, but only to the reasonable scope of the followine claims.
3o
Claims (21)
1. In a material folding machine including a frame, first and second juxtapositioned folding roll means rotatably mounted on the frame and each including first and second ends and a plurality of spaced sleeves thereon with each of the sleeves on each folding roll means positioned to cooperate with the corre-sponding sleeve on the other folding roll means, means for driving the first of the folding roll means and thereby driving the second folding roll means through frictional engagement of the sleeves, and an oscillatable blade means supported on the frame for movement into engagement with material between the blade means and the folding roll means to introduce material between the pair of folding roll means, the improvement comprising: the corresponding outer sleeves on the first end of each of the folding roll means are positioned adjacent the end of their respective folding roll means out of an area of normal material movement when material is introduced between the pair of folding roll means, the second folding roll means is mounted for movement toward and away from the first folding roll means, and resilient means act on the second folding roll means to yieldably bias the second folding roll means toward the first folding roll means.
2. The material folding machine as set forth in claim 1 wherein an intermediate sleeve on at least one of the following roll means is of reduced diameter with respect to the outer sleeves thereon.
3. The material folding machine as set forth in claim 2 wherein the resilient means exerts a greater force on the first end of the second folding roll means than on the second end of the second folding roll means.
4. The material folding machine as set forth in claim 3 wherein stop means cooperates with the second end of the second folding roll means to prevent engagement between cooperating outer sleeves on said second ends of the pair of folding roll means.
5. The material folding machine set forth in claim 4 wherein the diameter of the intermediate sleeve of reduced dia-meter is smaller than the diameter of the outer sleeves by an amount substantially equal to the distance between the co-operating outer sleeves on said second ends of the first and second folding roll means when said second end of the second folding roll means is in cooperative engagement with said stop means.
6. The material folding machine set forth in claim 2 wherein the second folding roll means is mounted on a pair of individually pivotally mounted arms for movement toward and away from the first folding roll means, and separate spring means act on each of the individually pivotally mounted arms to bias the second folding roll means toward the first.
7. The material folding machine set forth in claim 6 wherein stop means cooperates with the arm mounting the second end of the second folding roll means to prevent engagement between cooperating sleeves on the second ends of the first and second folding roll means.
8. The material folding machine set forth in claim 7 wherein the diameter of the intermediate sleeve of reduced diameter is smaller than the diameter of the outer sleeves by an amount substantially equal to the distance between the co-operating outer sleeves on the second ends of the first and second folding roll means.
9. A material folding machine comprising: a frame; first folding roll means mounted on the frame for rotation about a fixed axis; second folding roll means mounted on the frame in juxtaposition to the first folding roll means for rotation and for independent movement of the opposite ends thereof toward and away from the first folding roll means; resilient means acting on the second folding roll means to yieldably bias the second fold-ing roll means toward the first folding roll means; each of the folding roll means including first and second ends; first and second outer sleeves and an intermediate sleeve mounted on each of the folding roll means with each sleeve positioned to co-operate with the corresponding sleeve on the other folding roll means; means for driving the first folding roll means and thereby driving the second folding roll means through frictional engage-ment of at least a pair of the sleeves; oscillatable blade means supported on the frame for movement into engagement with material between the blade means and the folding roll means to move the material between the second outer sleeves and the intermediate sleeves on the first and second folding means; the first outer sleeves on the first and second folding roll means being posi-tioned adjacent the first end of their respective folding roll means out of an area of normal material movement when material is introduced between the first and second folding roll means by the blade means; and the intermediate sleeve on at least one of the folding roll means being of reduced diameter with respect to the outer sleeves; whereby, upon introduction of material between the first and second folding roll means, the second ends of the first and second folding roll means can move apart to provide space for the material between the second outer and intermediate sleeves while the first outer sleeves remain in frictional driving contact.
10. A material folding machine as set forth in claim 9 wherein the resilient means exerts a greater force on the first end of the second folding roll means than on the second end of the second folding roll means.
11. A material folding machine as set forth in claim 9 wherein the second folding roll means is mounted on the frame through a pair of individually pivotally mounted arms.
12. A material folding machine as set forth in claim 11 wherein the resilient means includes a separate spring acting on each arm, and the spring acting on the arm mounting the first end of the second folding roll means exerts a greater force than the spring acting on the arm mounting the second end of the second folding roll means.
13. A material folding machine as set forth in claim 11 wherein stop means cooperates with the arm mounting the second end of the second folding roll means to prevent engagement of the second outer sleeves.
14. A material folding machine comprising: a frame; first folding roll means mounted on the frame for rotation about a fixed axis; means for driving the first folding roll means;
second folding roll means mounted on the frame for rotation and for individual movement of the opposite ends thereof toward and away from the first folding roll means; third folding roll means mounted on the frame for rotation and for individual movement of the opposite ends thereof toward and away from the first folding roll means in a direction substantially perpendicular to the direction of movement of the second folding roll means; means yieldably biasing the second and third folding roll means toward the first folding roll means; first and second outer sleeves mounted on each of the folding roll means with each first outer sleeve adjacent a first end of its respective roll; an inter-mediate sleeve mounted on each of the folding roll means between the first and second outer sleeves; each of the sleeves on each of the second and third folding roll means being positioned in alignment with the corresponding sleeve on the first folding roll means; first oscillatable blade means supported on the frame for movement into engagement with material between the first blade means and the first and second folding roll means to move the material between the second outer and the intermediate sleeves on the first and second folding roll means; second oscillatable blade means supported on the frame for movement into engagement with material between the second blade means and the first and third folding roll means to move the material between the second outer and the intermediate sleeves on the first and third folding roll means; and each first outer sleeve being positioned out of an area of normal material movement when material is introduced between the folding roll means.
second folding roll means mounted on the frame for rotation and for individual movement of the opposite ends thereof toward and away from the first folding roll means; third folding roll means mounted on the frame for rotation and for individual movement of the opposite ends thereof toward and away from the first folding roll means in a direction substantially perpendicular to the direction of movement of the second folding roll means; means yieldably biasing the second and third folding roll means toward the first folding roll means; first and second outer sleeves mounted on each of the folding roll means with each first outer sleeve adjacent a first end of its respective roll; an inter-mediate sleeve mounted on each of the folding roll means between the first and second outer sleeves; each of the sleeves on each of the second and third folding roll means being positioned in alignment with the corresponding sleeve on the first folding roll means; first oscillatable blade means supported on the frame for movement into engagement with material between the first blade means and the first and second folding roll means to move the material between the second outer and the intermediate sleeves on the first and second folding roll means; second oscillatable blade means supported on the frame for movement into engagement with material between the second blade means and the first and third folding roll means to move the material between the second outer and the intermediate sleeves on the first and third folding roll means; and each first outer sleeve being positioned out of an area of normal material movement when material is introduced between the folding roll means.
15. The material folding machine as set forth in claim 14 wherein the intermediate sleeves on at least the second and third folding roll means are of reduced diameter with respect to the outer sleeves thereon.
16. The material folding machine as set forth in claim 15 wherein the yieldable biasing means exerts a greater force on the first ends of the second and third folding roll means than on the second ends thereof.
17. The material folding machine set forth in claim 16 wherein stop means cooperates with the second end of the third folding roll means to prevent engagement between the second outer sleeves on the first and third folding roll means.
18. The material folding machine as set forth in claim 17 wherein the diameter of each of the intermediate sleeves of reduced diameter is smaller than the diameter of the outer sleeves by an amount substantially equal to the distance between the second outer sleeves on the first and third folding roll means when the second end of the third folding roll means is in a position as close to the first folding roll means as permitted by the stop means.
19. The material folding machine set forth in claim 15 wherein each end of each of the second and third folding roll means is rotatably mounted on one end of a pivot arm, each of the pivot arms is pivotally mounted intermediate its ends to the frame, and the yieldable biasing means acts between the free end of each arm and the frame.
20. The material folding machine as set forth in claim 19 wherein the pivot arms mounting the first ends of the second and third folding roll means are mounted on a common pivot axis and the pivot arms mounting the second ends of the second and third folding roll means are mounted on a common pivot axis.
21. The material folding machine as set forth in claim 20 wherein stop means is mounted on the frame in the path of move-ment of the pivot arm mounting the second end of the third fold-ing roll means for engagement therewith to prevent engagement between the second outer sleeves of the first and third folding roll means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA248,924A CA1043369A (en) | 1976-03-26 | 1976-03-26 | Material folding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA248,924A CA1043369A (en) | 1976-03-26 | 1976-03-26 | Material folding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1043369A true CA1043369A (en) | 1978-11-28 |
Family
ID=4105566
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA248,924A Expired CA1043369A (en) | 1976-03-26 | 1976-03-26 | Material folding machine |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1043369A (en) |
-
1976
- 1976-03-26 CA CA248,924A patent/CA1043369A/en not_active Expired
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