EP0162167B1

EP0162167B1 - Apparatus and method for segregating counted slugs of flat folded boxes

Info

Publication number: EP0162167B1
Application number: EP84306353A
Authority: EP
Inventors: Raymond André Labombarde
Original assignee: International Paper Box Machine Co Inc
Current assignee: International Paper Box Machine Co Inc
Priority date: 1984-05-14
Filing date: 1984-09-18
Publication date: 1989-07-05
Also published as: DE3478854D1; EP0162167A3; EP0162167A2; CA1237104A

Description

In the folding paper box machine art, folder- gluers are well known to produce flat folded boxes, called "flats" herein, at high speed from flat blanks, by folding and gluing the flaps, tabs and panels thereof and delivering the adhered, collapsed flats to the upper stretch of the endless apron of a stacker. At the exit end of the stacker, it has been the custom for several employees to seek to keep up with the production of the folder-gluer by repeatedly manually removing successive individual "packets" or "lifts" and carrying them over to empty packing cases for depositing one layer, or several layers, to the case. Whe%the flats are shingled and recumbent, with, for example, each fiftieth flat counted and projecting slightly from the line of flats, it will be understood that the operator must place the hand under the flat at the point she believes she can easily carry, raise the flats to upstand on lower edge, compress the lift and try to bodily transport it to an empty case without dropping it on the floor. This continual manual lifting is not only arduous, but if a lift is dropped the stacker continues delivering flats until the entire line may have to be stopped.
In U.S. Patent 3,811,549 to Pressig of May 21, 1974, an apparatus for handling collapsed boxes is disclosed in which a sled and skates with a brake are located in front of the leading box to advance therewith up to a fixed barrier, and the segregation element is a plate poised above the path to descend downwardly across the entire path of the flats.
With the fixed stop of this device covering the entire leading flat and the segregation element covering the entire trailing flat, it would be difficult for an operator to grasp the packet, lift or slug between her hands and slide it further along the path. An unillustrated ram is apparently intended to move the captive packet sidewise of the path.
In EP-A-0049718 there is described apparatus for stacking and loading into a tray a plurality offlat articles. The apparatus comprises an inclined support down which the flats are moved and stacked against a restraining backing plate moving parallel with the support. When the backing plate reaches the end of the support it can be swung upwardly out of the way of the articles and moved back relative thereto to be reinstated in its operating position behind enough articles to form a stack which will fill a tray located at the end of the support. The front part of the support is displaceable rearwardly so that the front wall of the tray can be brought into contact with the leading article of the stack, and the stack slid into the tray. Such apparatus is suitable for low speed delivery of relatively small articles such as envelopes, and loading such articles into a tray. However, the present invention relates to the high speed delivery of flat folded boxes from a folder-gluer machine and packing of such stacks of such relatively large, heavy articles in cases.
This invention is directed to an apparatus (claim 1) and method (claim 13) for handling flats, which will enable a single operator to move from a case packer to the stacker, grasp a slug of counted flats between her hands, slide the slug in the direction of advance of the flats onto a transfer table and into an empty case, and return the grasp the next successive counted slug and repeat the cycle as described in U.S. Patent Application, Serial No. 583,640filed February 27,1984, notforming part of the state of the art.
Preferably, as the recumbent shingled flats are gradually raised to upstanding position on their lower edges, a hold down belt and hold down roll contacts the upper edges of the flats as their upper edges rise upwardly to maintain alignment.
Alongside the secondary apron is a guide in the form of a straight horizontal rod, parallel to the path of the flats, there being a carriage movable forwardly and rearwardly thereon by the contact of grooved rollers. Posts upstanding from the side carriage support a bracket which in turn supports a push rod, movable horizontally into, and out of, the path of the leading flat in the leading counted slug to engage it about mid-height. A one-way clutch in a roller which engages the secondary apron enables the carriage and rod to be advanced by the flats and apron, while prevented from forward fall by the push rod.
When the operator places her left hand on the leading flat she can withdraw the push rod, move the carriage in the direction of retraction, reinsert it in a predetermined position such as in front of the next successive counted slug and insert her right hand with the rod to grasp and slide the slug forwardly off the apron.
In another embodiment the roller in contact with the apron is in driving contact with a second roller in contact with the horizontal stacker platform through a one-way clutch and a speed reduction mechanism or drive train. Thus, the carriage advances at a predetermined speed such as one-third the speed of the apron to compress the flats after they have been edge stacked from longitudinal to lateral.
The invention will now be described with reference to the accompanying drawings in which:-

Fig. 1 is a top plan view of a carriage of the invention alongside a secondary stacker apron;
Fig. 2 is a side elevation thereof;
Fig. 3 is an end elevation from the front thereof with the roller in half section;
Fig. 4 is a view similar to Fig. 1 or another embodiment;
Fig. 5 is a view similar to Fig. 2 of the embodiment shown in Fig. 4;
Fig. 6 is a view similar to Fig. 3 of the embodiment shown in Fig. 4;
Fig. 7 is a diagrammatic perspective view on a reduced scale showing a secondary apron, hold down means, carriage and rod of the invention;
Fig. 8 is a side elevation view;
Fig. 8A is a side elevation view of the belt;
Fig. 9 is a diagrammatic perspective view similar to Fig. 7 showing the continuous stacker apron.

As is best shown in Fig. 7, the primary apron 21, of the stacker 22, receives folded and glued collapsed boxes of trays, such as 23, called "flats" herein, from a folder-gluer, not shown, and advances them in straight line, shingled formation, along the horizontal path 24. In this invention, a secondary stacker 25, is provided with a secondary stacker apron 26, in straight line extension of apron 21, along path 24, the apron 26 being driven by the drive of apron 21, not shown, at a speed less than the predetermined speed of the primary apron 21.
As the lower edge 27 of each successive individual flat 23 drops into the apron nip 28, formed between end roll 29 of apron 21 and entrance roll 31 of apron 25, to encounter the slower moving secondary apron 26, the upper edge 32 of each flat 23, rises in an arc as shown until the flat is upstanding on its lower edge 27.
Preferably, a hold down belt 33, trained around hold down rolls 34 and 35, is provided to exert a downward force on the upper edges 32 of each flat 23, and maintain them in alignment while holding them down. The hold down belt 33 is driven by the drive of apron 21, in a well known manner, and its lower stretch 36 advances at a greater speed than the predetermined speed of the apron 21, to assist in frictionally raising the flats 23 to upstanding, edge supported position.
The conventional folder-gluer includes mechanism which automatically kicks out every fiftieth flat, such as at 37, 38, and 39, laterally sidewise from the shingled line 41 of flats to provide a visual count of individual and successive slugs of flats, each precounted to fit in a packing case when slightly compressed lengthwise. Each individual and successive slug 42, 43 or 44 may be precounted into any number of flats 23, desired, the number fifty being selected herein for convenience of description, it being understood that each run of flats may be as small as folded toothbrush boxes to as large as game boxes.
The size and overlaps of such boxes make considerable difference in the ability of an operator to carry a "lift" thereof without dropping the lift on the floor so that in the prior art several trips and lifts may be required to constitute a single counted slug forming a single layer in a packing case.
In this invention, however, the slug is slidably supported all the way to the packing case so that an operator can grasp the leading flat 45 with the left hand, the trailing flat 46, of the endmost counted slug with the right hand and slide it forwardly along the horizontal path 24, and into the case, as an integral unit with no danger of dropping the slug.
The count divider apparatus 47, of the invention includes the guide means 48, which extends alongside the secondary stacker apron 26, in parallelism with the horizontal path 24, of the line 41 of flats 23, advancing along the path on the apron. Preferably, guide means 48, is in elongated guide or rod 49 attached at each opposite end by clamp blocks such as 51 and 52, to an existing take up piece 53, of the secondary stacker 25, to extend parallel therewith at a spaced distance laterally therefrom.
The rod 49, thus forms a track for two pairs 54 and 55, of grooved track rolls 56, 57, 58 and 59, mounted under the horizontal elongated plate 61, of the carriage, or side car 62, so that the carriage 62 will move horizontally along the guide 49, in parallelism with path 24.
As is best shown in Fig. 1, the carriage plate 61, is provided with a pair of laterally extending, longitudinally spaced apart slots 63 and 64, for clamps 65 and 66, so that the plate 61, can be moved laterally to any desired location relative to apron 26 to accommodate flats of various dimensions while still being guided on rod 49.
A pair of longitudinally spaced apart, upstanding posts 67 and 68 are provided on elongated plate 61, each having a split clamp 69 or 71 thereon, tightenable by a handle 72 or 73, for adjustment at a preferred height above plate 61, which is usually about mid-height of the upstanding leading flat 45. The split clamps 69 and 71 support the longitudinally extending member 74, tightenable therein by clamp handle 75, and carrying the yoke or bracket 76 for laterally slidable or pivotable push rod or member 77, with its pointed terminal end 78. The push rod 77 is a segregation element, mounted on carriage 62, to move transversely and horizontally in and out of path 24. Rod 77 normally extends into the path in front of the leading flat 45, in each successive, individual slug at about mid-height to support the flats in upstanding position while not interfering with manual grasping of the slug.
Roller means 79, is provided on carriage 62, in the form of at least one roller 81, journalled at 82, to an integral inner wall 83, upstanding from plate 61, and having a friction face 84 in rolling contact with secondary apron 26. Preferably, a second roller 85 is provided and is also similar to roller 81. The face 84 is preferably of rubber, and preferably a weight 86 is provided to assure a firm contact of roller to apron.
One-way clutch means 87 forms part of roller means 79, and includes at least one one-way clutch 88, built-in to roller 81, and preferably a similar one-way clutch 89, built-in to roller 85, (Fig. 1). The one-way clutch means 87, permits the leading flat 45 to bear against the push rod 77, without advancing the rod 77 or carriage 62 relative to the apron 26, thereby maintaining the leading slug 42 upright ready for grasping by the operator. However, when the operator places the left hand on the leading flat, the push rod 77 can be retracted horizontally, the carriage 62 will roll freely in the direction of retraction toward the next successive slug 43, and the push rod 77 can have its point 78 inserted at the fifty first flat 23 to hold it upright, while the operator slides the endmost slug 42 forwardly along path 24 and into a packing case. Thus, the one- way clutches 88, 89 permit the carriage 62 to retract freely on the apron 26, but prevents advance of the carriage 62 on the apron 26.
The embodiment of the invention shown in Figs. 4, 5 and 6 is similar to the preferred embodiment of Figs. 1, 2 and 3, except that the roller means 79 includes an additional roller 91, in rolling contact with the horizontal, elongated, portion 92 of the stacker platform 93, which extends under the secondary apron 26, for supporting the apron against sag. The additional roller 91 has a friction face 94, and is journalled at 95 in a longitudinally extending slot 96, in a lever 97 pivoted on a laterally extending shaft 98. The friction face 84 of roller 81 is in rolling contact with secondary apron 26, and is fast on shaft 98. Speed reduction mechanism 99 is provided in the form of a sheave 101 which is driven by shaft 98 and is in driving contact with the additional roller 91, through a one-way clutch 102, the sheave 101 being of predetermined less diameter than the diameter of roller 81.
Thus, the advance of the apron 26, at a predetermined speed, rotates the roller 81 at that speed, which in turn rotates the additional roller 91, for example at one-third of that speed, so that the carriage 62 and push rod 77 hold back and compress the line of flats 41 on the secondary apron 26, as well as holding the leading flat 45 upstanding on lower edge 27.
The compression of the flats 23, in the line of flats 41, is sometimes necessary when the flats 23 being run on the folder gluer are narrow and elongated, such as toothbrush boxes 103, such boxes being advanced along the paper line of the folding and gluing zones while extending longitudinally thereof, as shown diagrammatically in Fig. 7. When such flats 103 reach the stacker they must be turned by a turning plow 104, to extend laterally and transversely of the stacker apron 26 as at 105, in order to be shingled in a manageable manner for handling and packing. Having been so turned by the edge stacker, or plow 104, the resulting line of flats 41 is loosely packed, and a slug to fit a case would be too long to be capable of being grasped by an operator.
It is for that reason that the invention includes the step of slowing down the advance of the flats 23 relative to the speed of the apron 26 to compress the line of flats 41 into manageable slugs, easily handled by an operator as a bodily transportable, slidable unit.
As shown in Fig. 8 the preferred form of hold down belt 33 is at least one elongated alignment belt 106 trained around sheaves 107, 108 and 109, and having tension control sheaves 113, 114 and 115. Alignment belt 106 includes a lower stretch advancing in the direction of advance of the shingled flats 23 on primary apron 21, with a first portion at a spaced uniform distance above the level of primary apron 21_; and a second portion inclined upwardly and forwardly to a level substantially equal to the height of an erected flat 23 upstanding on its lower edge 27 on secondary apron 26. An endless belt 110 trained around sheaves 111 and 112 is also provided, with its lower stretch in contact with the upper edges 32 of the shingled flats 23. The inclined portion of alignment belt 106 raises the upper edges 32 of the shingled flats 23 as the slower running secondary apron 26 slows the advance of the lower edges 27, thereby raising the flats 23 to an upstanding, erect position as shown. The belt nip 119 between the primary apron 21 and the secondary apron 26 assists in pivoting the flats upright.
As shown in Fig. 8A, the belt 106 is formed of an inner layer 117 of fabric such as canvas and an outer layer 118 of rubber-like material, the outer layer 118 having a plurality of spaced transverse ribs, ridges or knobs to increase the contact with the upper edges of the flats 23.
Fig. 9 is similar to Fig. 7 except that it shows that a continuous stacker apron 123 can be used with the edge stacker, or plow 104, rather than a primary and secondary apron 21, 26 separated by a nip 28.

Claims

1. Apparatus for segregating a counted slug of flat folded boxes from a plurality of such flats being advanced in a substantially horizontal path on the apron of a stacker, comprising guide means (48) associated with said stacker (22) and including a guide (49) extending substantially in parallelism with said path (24), and a segregation element mounted to move in and out of said path, said element (77) normally extending into said path, in front of the leading flat in each successive, individual slug, thereby to support said flats in upstanding position, but being retractable out of said path for reinsertion at a predetermined position, further comprising a carriage (62), mounted to move substantially horizontally along said guide (49) substantially in parallelism with said path (24), said segregation element (77) being mounted on said carriage (62), roller means (79) including at least one roller (81) on said carriage (62) in rolling contact with the apron (26) of said stacker (22) one-way clutch means (87) forming part of said roller means (79) for said carriage (62) to advance only as fast as said apron (26), but permitting free rolling of said carriage (62) relative to said advancing apron (26).

2. Apparatus as specified in claim 1, characterised in that, said guide (49) is an elongated rod, affixed to said stacker (22) at a spaced distance alongside said stacker apron (26); and said carriage (62) includes two pairs (54, 55) of grooved wheels (56, 57, 58, 59), the wheels of each pair of rolling each on an opposite side of said rod (49); whereby said guide (49) forms a substantially horizontal track for said carriage (62).

3. Apparatus as specified in claim 1, characterised in that, said carriage (62) includes an elongated plate (61); a pair of longitudinally spaced posts (67, 68) upstanding from said plate (61), a longitudinally extending member (74) supported by clamps (65, 66) each clamp (65, 66) being adjustable in height on one of said posts (67,68), said member (74) having a forward end, a bracket (76) extending substantially horizontally at the forward end of said member (74), in a direction normal to said path (24), and said segregation element (77) being slidable transversely of said path (24), in said bracket (76).

4. Apparatus as specified in claim 1, characterised in that, at least one said roller (81) of said roller means (79) is in rolling contact with said apron (26), and includes said one-way clutch means (87) whereby said roller (81) will not revolve in a forwardly angular direction and cause said carriage (62) to advance only with said apron (26), but said roller (81) will revolve in a reverse angular direction to permit said carriage (62) to be freely rolled in the opposite direction of the said apron (26).

5. Apparatus as specified in claim 1, characterised in that, said roller means (79) includes said one roller (81) and an additional roller (91), the additional roller (91) being in rolling contact with a horizontal elongated platform (92, 93) extending substantially in parallelism with said path (24), and there being a speed reduction mechanism (99) connecting said one roller (81) and said additional roller (91) whereby said one roller (81) is rotated by said apron (26) at the speed thereof, but rotates said additional roller (91) at a lesser speed on said platform (92, 93) to cause said carriage (62) and its segregation element (77) to compress the flats (23) in the slugs (42, 43, 44) advancing on said apron (26).

6. Apparatus as specified in claim 1, characterised in that said guide means (48) comprises a secondary stacker (25) having a secondary apron (26) in continuation of said primary stacker apron (21), and arranged to advance said flats (23) at a speed less than the speed of said primary apron (21) to raise said flats (23) from shingled formation to upstanding edge (27) supported formation; a hold down belt (33) having a lower stretch (36) advancing in the direction of advance of said flats (23) in contact with the upper edges (32) of said flats (23) as they are so raised to maintain alignment thereof; said carriage (62) is mounted on said secondary stacker (25) to advance alongside the leading counted slug (42) of flats (23), with said secondary apron (26), and substantially parallel with said path (24); said segregation element (77) comprises a segregation rod movable in a substantially horizontal direction and normally extending into said path (24), mid-way of the height of the leading flat (45) of said leading counted slug (42) to support the same against forward tilt; and said apparatus comprises means (87) for enabling retraction of said carriage (62) in a direction opposite to the direction of advance of said secondary apron (26) to permit insertion of said rod (77) in front of the leading flat (45) of the next successive slug (43) of said flats (23).

7. Apparatus, as specified in claim 6, characterised in that, said carriage (62) includes said at least one roller (81) in contact with said secondary apron (26) and having a one-way clutch (88) which prevents rolling movement of said carriage (62) in the direction of advance, but permits rolling movement of said carriage (62) in the direction of retraction on said apron (26).

8. Apparatus as specified in claim 6, characterised in that said carraige (62) is operably connected to said secondary apron (26) by the frictional contact of at least one friction face (84) of said roller (81); and said retraction enabling means (87) is a one-way clutch (88) built in to said roller (81), said roller (81) being freely rotatable relative to said secondary apron (26) when the carriage (62) is reversed but being locked against rotation relative to said secondary apron (26) when said carriage (62) is urged forwardly relative to said apron (26) by said leading slug (42).

9. Apparatus as specified in claim 1, characterised in that said guide means (48) comprises an endless elongated alignment belt (106), trained around sheaves (107, 108, 109) mounted above said apron (26), said belt (106) having a lower stretch advancing in the direction of advance of said shingled flats (23) with a first portion extending longitudinally at a spaced uniform distance above said apron (26) and a second portion inclining upwardly and forwardly to a level substantially equal to the height of an erected flat (23), said lower stretch advancing at greater speed than the speed of said apron (26) and riding on the upper edges (32) of said flats (23) to raise them from shingled to erect position, and said carriage (62) is a movable wheeled carriage mounted to roll alongside said path (24) and said segregation means (77) comprises a segregation rod mounted to move substantially horizontally in an out of the path (24) of the leading slug (42) of said flats (23) to maintain its erect position and having a one way clutch (88) on a roller (81) thereof to allow the carriage (62) to advance as fast as the apron (26) but permit free reverse rolling thereof.

10. Apparatus as specified in claim 9, characterised in that the lower stretch of said alignment belt (106) includes a plurality of spaced, transversely extending, ribs or ridges for engaging and lifting up the upper edges of said shingled flats (23).

11. Apparatus as specified in claim 9, characterised in that said stacker apron (21, 26) is divided into a primary apron (21) advancing at a predetermined speed under the first portion of said alignment belt (106) and a secondary apron (26) advancing at a lesser speed, under the second portion of said alignment belt (106), said secondary apron (26) slowing the advance of the lower edges (27) of the shingled flats (23) on said aprons (21, 26) as said alignment belt (106) engages the upper edges (32) thereof and raises said flats (23) from shingled to a substantially vertical position on said secondary apron (26).

12. Apparatus as specified in claim 1, characterised in that said guide means (48) comprises elongated alignment belt means (110) extending longitudinally above a stacker apron (123) in a zone in advance of an elongated zone in which said flats (23) are in upstanding, close-packed, counted slugs (42, 43, 44) supported on their lower edges (27), said belt means (106) including at least one endless belt (110) having a lower stretch advancing in the direction of advance of the flats (23) shingled on said apron (123) and in contact with the upper edges (32) of said flats (23), said lower stretch having a plurality of spaced transverse ridges thereon, having an upwardly and forwardly inclined portion for lifting said shingled flats (23) to upstanding, erected position and having means for advancing said stretch at a greater relative speed than the speed of said apron (123).

13. A method of segregating in a segregating apparatus a counted slug of flat folded boxes (23) from a plurality of such flats advancing in shingled formation along a substantially horizontal path (25) supported on a primary stacker apron (22), said segregating apparatus having a secondary stacker apron (26), and a segregation member (77) mounted on a carriage (62), said method comprising advancing said secondary apron positioned in extension of said primary apron at a slower speed than the speed of said primary apron to raise said shingled flats into upstanding position resting on the lower edges thereof; locating said member (77) so as to extend into the path of said flats, advancing said flats along said path, periodically retracting said member out of said path and retracting same back to the next successive counted slug on said secondary apron and inserting said member transversely into the path of said flats, moving said carriage (62) by advancing same at a predetermined speed, alongside the leading counted slug (42) on said secondary apron (25) in a path substantially parallel with the path (24) of said flats (23), said member (77) being in contact with about mid-height of the leading flat (45) therein again moving said carriage (62) by retracting same with said member (77) back to the next successive counted slug (43) on said secondary apron (25) and inserting said member (77) in contact with about mid-height of the leading flat (45) in said next successive slug (43) of counted flats (23).

14. A method as specified in claim 13, characterised by the step of holding down the upper edges (32) of said flats (23) by a downward force advancing with said flats (23) at the junction (28) of said primary and secondary aprons (21, 25) to maintain alignment thereof as the flats (23) are gradually raised upright from shingled relation.

15. A method as specified in claim 13, characterised by the step of edge stacking flats (23) shingled longitudinally into flats (23) shingled laterally on said secondary apron (25); and the step of advancing said carriage (62) at a speed less than the predetermined speed of said secondary apron (25), to compress said laterally shingled flats (23) into a more compact alignment of counted slugs (42, 43, 44).