Conveyor with a plurality of partitioning means

Abstract: A conveyor (58) includes first (5-1,5-2) and second (5'-1,5'-2) groups of flights which are spaced along the conveying direction to provide spaces sufficient to hold packs (1) therein. The flights in each group are divided into first (5-1,5'-1) and second (5-2,5'-2) sets. The first and second groups of flights are mounted to first (18a,18b) and second (21a,21b) conveyor chain pairs, respectively, and moved through pack loading (43) and unloading (19) stations. Stepping motors (8a,8b) drive the first and second chain pairs independently. A controller (27) causes a set of flights after being loaded or unloaded to be forwarded to the unloading or loading station at a speed higher than the speed at which the sets move through the loading station.

Description: This invention relates to conveyor apparatus useable with a boxing system for putting articles, e.g. packs of food, such as potato chips, beans, pieces of candy and the likes, in boxes or cases, such as corrugated cardboard cases. An example of a prior art boxing system is shown in Japanese Unexamined Patent Publication (KOKAI) No. HEI 9-77003 published on March 25, 1997. This prior art boxing system is used to put packs 1 shown, for example, in FIGURE 25(a) or boxes (not shown) in a case 2 shown, for example, in FIGURE 25(c). Referring to FIGURE 25(a), packs 1 conveyed on an input conveyor 4 are put into spaces 6 formed between a plurality of adjacent ones of a plurality of fins 5 planted on the conveying surface of an alignment conveyor 3. One pack is put into one space 6. Thus, packs 1 are aligned on the conveying surface of the alignment conveyor 3, standing erect. When a predetermined number, five in the illustrated example, of packs 1 are aligned on the conveyor 3, a pusher plate 11 pushes five packs on the conveyor 3 to move on a U-shaped intermediate member 10 onto a predetermined position on gates 7-1 and 7-2 as shown in FIGURE 25(b). The pusher plate 11 has slits 12 therein to avoid interference with the fins 5 when it pushes five packs on the alignment conveyor 3. In the illustrated example, two sets of five packs 1 have been pushed onto the gates 7-1 and 7-2. As shown in FIGURES 25(c) and 25(d), after pushing five packs 1 onto the predetermined position on the closed gates 7-1 and 7-2, the pusher plate 11 moves upward and returns to its original standby position (FIGURE 25(a)) along a path above the alignment conveyor 3 in order to avoid interference with succeeding packs 1 being conveyed and aligned on the conveyor 3. Then, as shown in FIGURE 25(b), the packs 1 standing erect on the gates 7-1 and 7-2 are held by a pair of holding plates 9-1 and 9-2. Thereafter, as shown in FIGURE 25(c), the gates 7-1 and 7-2 are opened, and the cardboard case 2 is moved upward from below the gates 7-1 and 7-2 so that the ten packs 1 held between the holding plates 9-1 and 9-2 are put into the cardboard case 2. The cardboard case 2 has been conveyed on a roller conveyor (not shown) to a predetermined position below the gates 7-1 and 7-2. The cardboard case 2 has four flaps 2a-2d. Next, a stuffing plate 13 disposed above the gates 7-1 and 7-2 is lowered, and, at the same time, the holding plates 9-1 and 9-2 are moved in the direction away from each other. In this manner, packs 1 are placed in the cardboard case 2, as shown in FIGURE 25(c). Then, the cardboard case 2 with packs 1 put therein is lowered, and the gates 7-1 and 7-2 are closed, so that the boxing system returns to the state shown in FIGURE 25(a) to thereby complete one cycle of operation. This operation is repeated. In the above-described prior art boxing system, the alignment conveyor 3 must be stopped at the pushing position shown in FIGURE 25(a) when the pusher plate 11 pushes five packs 1 on the alignment conveyor 3 onto the intermediate member 10. It disadvantageously prevents packs 1 conveyed by the input conveyor 4 from being continuously supplied onto the alignment conveyor 3. Another problem is as follows. When one set of five packs 1 is pushed off the alignment conveyor 3, a next set of five packs 1 may have been already available. However, such new set cannot be brought to the pushing position at a high speed, since the alignment conveyor 3 should move at a speed low enough to receive packs 1 supplied by the input conveyor 4 without fail. These problems impede the improvement of the boxing efficiency of prior art systems. For conveying and boxing thick packs in a case, the spacing between adjacent fins 5 should be increased. The fins 5 are screwed to the conveying surface of the conveyor 3. In order to widen the spaces 6, the fins 5 must be unscrewed, which requires time and labor. As shown in FIGURE 25(a), the holding plates 9-1 and 9-2 are arranged to advance by a predetermined stroke to press against a given number of packs 1 between them. Accordingly, if each of the five aligned packs 1 to be held is relatively thick, there is a danger that the holding plates 9-1 and 9-2 may crush items contained in the packs 1. On the other hand, if the sum thickness of the five packs 1 is relatively small, they may slip off from between the holding plates 9-1 and 9-2. Accordingly, a predetermined number of packs 1 may not be boxed neatly. Thus, it is not always possible for the holding plates 9-1 and 9-2 of the prior art system to hold different sized packs with force appropriate for such packs. Further, since the holding plates 9-1 and 9-2 hold packs 1 by applying holding forces along the line on which packs 1 are aligned in a row, all or some of aligned packs 1 may slip out from the row in the lateral direction. Such packs 1 may be caught by the upper edge of a side-wall of the case 2, and, therefore, sometimes, proper boxing of packs 1 cannot be done. Sometimes, a large number of packs 1 may be in so long a row, being held between the holding plates 9-1 and 9-2, that one or more of packs 1 may slip off. If the force given by the holding plates 9-1 and 9-2 to the row of packs 1 is increased to prevent such slip-off of packs, the packs may be sometimes damaged. Accordingly, there is some limit on the holding force applied by the plates 9-1 and 9-2. In prior art systems, in order for packs 1 to be put into a case easily, the case should have a relatively large opening, which means that large-sized cases 2 are required. This necessitates a relatively large space for storing the packed cases 2. US-A-5127 209 discloses a conveyer apparatus according to the preamble of claim 1 comprising conveying means traveling in a loop including upper and lower paths with turning paths therebetween; a plurality of partitioning means mounted to said conveying means, each of said partitioning means being detachably mounted to said conveying means by means of partitioning means mounting means, and being spaced from adjacent partitioning means along a conveying direction to provide spaces therebetween sufficient to hold articles therein, successive ones of said spaces being loaded with articles when said partitioning means pass through a predetermined loading position in the turning path from said lower path to said upper path; driving means for driving said conveying means; and control means for changing the amount by which said partitioning means are advanced to receive articles in said loading position. US-A-4716 714 discloses an automatic packaging machine having a conveyor which travels over a fixed and closed path with a plurality of carriers mounted at fixed intervals along the conveyor. A tray having a fixed physical dimensions, is mounted on the carrier to carry an object having the same dimensions. The tray is reliably locked onto the carrier by at least two inverted, bolt-like interconnectors located at positions displaced along the length of a support plate which is on the carrier. A key hold in the support plate received a head on one of the bolt-like interconnectors which passes through and then slide along the length of and is captured in a small end of the keyhole slot. A leaf spring snaps over the head of one bold as it slides in the key hole slot. The leaf spring is flexed away from the bolt head to release the tray. An object of the present invention is to provide a conveyor apparatus which can be used in a boxing system and which includes a plurality of easily detachable fins, between adjacent ones of which packs conveyed to be put into a case are disposed and supported. Another object of the invention is to provide such fins between adjacent ones of which packs can be supported, standing erect without bend, so that the packs can be put into cases, being erected. According to the present invention the conveyor apparatus is characterized in that each of said partitioning means includes a partition standing erect and extending in the direction perpendicular to said conveying direction, and a base connected to said partition; and each of said partitioning means mounting means comprises a mounting device secured to said base of said partitioning means, and an engaged device adapted to be engaged by the associated mounting device, said engaged devices being secured to said conveying means along said conveying direction with a fixed pitch; said engaged devices being arranged such that plural types of partitioning means with different distances between the mounting devices and the partitions thereof can be mounted to said conveying means; and said control means changing the amount by which said partitioning means are advanced in accordance with said distance between said mounting devices of adjacent ones of said partitioning means. The control means cause either one of the groups of first and second partitioning means to pass through the loading position at a predetermined article receiving speed, while causing the other group to be placed in the unloading position. The conveyor apparatus may be arranged so that while one of the groups of first and second partitioning means is being loaded in the loading position, the other group, after being unloaded, stands by for the loading at a position before the loading position. Alternatively, it may be so arranged that while one of the groups is being loaded in the loading position, the other group, after being loaded with articles, stands by for the unloading at a position before the unloading position. A number of different types of partitioning means may be used, although preferably two different types are provided. In order that the invention may be well understood, there will now be described some embodiments thereof, given by way of example, reference being made to the accompanying drawings, in which: FIGURE 1 is a front view of an alignment conveyor system used in a boxing system which incorporates the present invention; FIGURE 2 is a plan view of the alignment conveyor system according to the present invention shown in FIGURE 1; FIGURE 3 is a plan view of the boxing system which does not form part of the present invention; FIGURE 4 is a front view of the boxing apparatus shown in FIGURE 3; FIGURE 5 is a side view of the boxing system shown in FIGURE 3; FIGURES 6(a), 6(b) and 6(c) illustrate a fin-mounting arrangement of the present invention for mounting fins to the alignment conveyor system shown in FIGURE 1, in which FIGURE 6(a) is an enlarged front view of a press-down limiting member contacting a fin-retainer together with a fin-mounting fitting, FIGURE 6(b) is an enlarged front view of the press-down limiting member shifted upward away from the fin-retainer member, and FIGURE 6(c) is an enlarged plan view of the fin-mounting fitting; FIGURES 7(a) through 7(f) illustrate how the fin is mounted to the alignment conveyor system, in which FIGURE 7(a) is a front view of the fin-mounting arrangement with the fin-retaining member inserted into a wider opening of a through-hole formed in the fin-mounting fitting, FIGURE 7(b) is a partially cross-sectional view along a line B-B in FIGURE 7(a), FIGURE 7(c) is a front view of the fin-mounting arrangement with the fin-retainer slid into a narrow opening of the through-hole in the fin-mounting fitting, FIGURE 7(d) is a partially cross-sectional view of along a line D-D in FIGURE 7(c), FIGURE 7(e) is a front view of the fin-mounting arrangement with the fin-retainer abutting the lower surface of the portion of the fin-mounting fitting around the narrow opening of the through-hole, and FIGURE 7(f) is a partially cross-sectional view along a line F-F in FIGURE 7(e). FIGURES 8(a) and 8(b) are front and side views respectively of one of holding plate moving apparatuses which does not form part of the invention for moving pack holding plates of the boxing system toward and away from each other; FIGURES 9(a) and 9(b) are front and side views respectively of an example of a force detector other than the one used in the apparatus shown in FIGURES 8(a) and 8(b). FIGURES 10(a), 10(b) and 10(c) are front, side and plan views respectively of a side holding plate driving arrangement of the boxing system shown in FIGURE 1 which does not form part of the present invention; FIGURE 11 is a plan view of a guide used in the boxing system of Figure 3; FIGURES 12(a) and 12(b) are cross-sectional views of a part of the guide shown in FIGURE 11, showing guide plates extending straight and guide plates pressed outward by packs, respectively. FIGURE 13 is a cross-sectional view of the guide mounted in operational relation to the boxing system. FIGURES 14(a) through 14(j) are perspective views illustrating how packs are put into a box, in which FIGURE 14(a) shows packs being supplied to the alignment conveyor system, FIGURE 14(b) shows the packs arranged on the alignment conveyor system, FIGURE 14(c) shows a pusher plate pushes the packs out from the alignment conveyor system, FIGURE 14(d) shows the pusher plate staying in front of the alignment conveyor system, FIGURE 14(e) shows the pusher plate which has returned to its original position, FIGURE 14(f) shows the packs held by the front and rear holding plates and a side holding plate, FIGURE 14(g) shows the lifted case with gates opened, FIGURE 14(h) shows a lowered stuffing plate with the front and rear holding plates moved away from the packs, FIGURE 14(i) shows the packs pushed into the case, and FIGURE 14(j) shows the gates moving to their closed position; FIGURE 15 is a block diagram of electrical circuitry of the boxing system which does not form part of the present invention; FIGURE 16 is a flow chart illustrating the operation of the alignment conveyor system ; FIGURES 17(a) and 17(b) show a flow chart illustrating the operation of the front and rear holding plates and the side holding plate. FIGURE 18 is a flow chart illustrating the operation of an alignment conveyor system used in a boxing system according to a second embodiment, which does not form part of the present invention, in which fins are mounted on the alignment conveyor system with the spacing of 64 mm (2.5 inches) disposed between adjacent fins; FIGURE 19 is a flow chart illustrating the operation of the alignment conveyor system used in the boxing system, in which fins are mounted on the alignment conveyor system with the spacing of 50mm (2 inches) disposed between adjacent fins; FIGURE 20 is a side view of the alignment conveyor system used in the boxing system in which fins spaced by 64 mm (2.5 inches) are in the unloading position; FIGURES 21(a) and 21(b) illustrate how the fins spaced by 64mm (2.5 inches) are moved to the loading position by an amount varied for the respective fins, in which FIGURE 21(a) shows the second fin receiving an pack, and FIGURE 21 (b) shows the third fin receiving an pack; FIGURES 22(a) and 22(b) illustrate how the fins spaced by 64mm (2.5 inches) are moved to the loading position by a fixed amount, in which FIGURE 22(a) shows the second fin receiving an pack, and FIGURE 22(b) shows the third fin receiving a pack. FIGURES 23(a) and 23(b) illustrate how fins of the first embodiment spaced by 50mm (2 inches) are moved to a loading position by a fixed amount, in which FIGURE 23(a) shows the second fin receiving a pack, and FIGURE 23(b) shows the third fin receiving a pack. FIGURE 24 is a side view of the fins of the first embodiment spaced by 2 inches are in an unloading position; and FIGURES 25(a) through 25(d) are perspective views of a prior art boxing system illustrating how packs are put into a case, in which FIGURE 25(a) shows packs aligned on an alignment conveyor system, FIGURE 25(b) shows the packs pushed out of the alignment conveyor system by a pusher plate, FIGURE 25(c) shows the case enclosing the packs, and FIGURE 25(d) show the case containing the packs is removed from holding plates. Referring to the accompanying drawings, a boxing system with which the present invention may be utilised is described. FIGURES 14(a) through 14(j) illustrate how packs are put into a cardboard box. The boxing system shown is used to put five (5) packs 1 into a corrugated cardboard box (hereinafter referred to simply as box) 2 as shown in FIGURE 14(j). The packs 1 are erected in the box 2 with their bottoms down. Of course, the boxing system can be used to put smaller boxes in the box 2. An input conveyor or supply means 4 is linked with an alignment conveyor system 58 to supply packs 1 onto the alignment conveyor system 58. Packs 1 are successively put one by one into respective ones of pack receiving spaces 6 formed between adjacent ones of plural fins or partitioning means 5 mounted to the conveying surface of the alignment conveyor system 58. Respective packs 1 are put in the direction perpendicular to the conveyor surface so that they can erect upright in the respective pack receiving spaces 6. The alignment conveyor system 58 is driven by two stepping motors 8a and 8b (FIGURE 1) to advance intermittently. The motors 8a and 8b are controlled by a control system to cause the fins 5 to advance in such a manner that one of packs 1 conveyed by the input conveyor 4 is put input each space 6. Although not shown in FIGURES 14(a) through 14(j), two sets of six fins 5, namely, a fin set 5-1 and a fin set 5-2, and two sets of six fins 5', namely a fin set 5'-1 and a fin set 5'-2, are mounted to fin-mounting fittings 33 secured to the alignment conveyor system 58 (FIGURE 1). In the example shown in FIGURE 1, the pitch of the fin-mounting fittings 33 is 25mm (one (1) inch), and six fins 5 are mounted to the respective ones of six successive pairs of fin-mounting fittings 33 so that adjacent fins are spaced by 25mm (one inch). The motor 8a drives two of the four fin sets, while the motor 8b drives the remaining two fin sets. Packs 1 are successively conveyed to an unloading station 19 by the fins 5 of the four fin sets. In this specification, the reference numeral "5" when used singly refers generally to one or all of the fins used. Similarly, the reference numeral "6" when used singly refers generally to one or all of the pack receiving spaces. Next, when a predetermined number, e.g. five, of packs 1 put into five pack receiving spaces 6 between the fins 5 on the conveyor system 58 are brought to the unloading station 19, being aligned with each other, a pusher plate (unloading means) 11 pushes the five packs 1 aligned on the conveyor system 58, as shown in FIGURE 14(b). The pusher plate 11 has slits 12 therein through which the fins 5 can pass when the pusher plate 11 moves across the alignment conveyor system 58. Then, as shown in FIGURE 14(c), the five packs are pushed out of the conveyor system 58 through a generally U-shaped corridor 10 onto a pair of gates 7. The pusher plate 11 is driven to move laterally across and above the alignment conveyor system 58 by a later-described linear driver 55 (see, for example, FIGURES 3-5). Thus, the pusher plate 11 can push five packs 1 on the alignment conveyor system 58 to move through the corridor 10 onto the gates 7 in the closed holding state. A stop plate 34 shown in FIGURE 14(c) acts to prevent the packs 1 from being pushed further on the gates 7 and also align the five packs 1 in a row. The pusher plate 11 is driven to move to push packs 1 out of the alignment conveyor system 58 when the conveyor system 58, which is intermittently driven to move, is temporarily stopped at a predetermined position. Depending on the width of the row of aligned packs 1 and the number of rows of packs 1 to be put into the box 2, the number of reciprocal movements and the stroke of respective movement of the pusher plate 11 may be changed appropriately. After pushing packs 1 to the predetermined position on the gates 7, the pusher plate 11 moves back in the opposite direction and temporarily stops at a location before the alignment conveyor system 58, as shown in FIGURE 14(d), and, then, further moves across the conveyor system 58, without being interfered by the fins 5, to the original position to stand by for the next pushing operation, as shown in FIGURE 14(e). Then, a stuffing plate 13 is lowered to a predetermined level to push down the top edges of the five packs on the gates 7 to thereby level the heights of the respective packs 1, as shown in FIGURE 14(e). Thereafter, as shown in FIGURES 14(e) and 14(f), a side holding plate 35, which has lain prone, is driven by a side holding plate driving arrangement 107 to rotate to the vertical position, where it presses against the sides of the five packs on the gates 7 on the alignment conveyor side to make them align. At the same time, front and rear, upright holding plates 9-1 and 9-2 located at opposite ends of a row of the five packs 1 on the gates 7 press against the front and rear ends of the row of the packs 1. Thus, the five packs 1 on the gates 7 are held by the front and rear holding plates 9-1 and 9-2, the stop plate 34 and the side holding plate 35, which are pressed against the row of packs 1 from the four sides thereof. Then, as shown in FIGURE 14(g), the two gates 7, which have been closed to support the five packs 1 thereon, are opened by a gate driver 106 (FIGURE 3). The box 2 on a box rest 17 (see, e.g. FIGURE 4) is lifted upward by a box lift 98 (see, e.g. FIGURE 4) to locate below the packs 1. The box 2 has been transported by a conveyor 96 shown in FIGURE 4 and has stood by on the box rest 17. A pack guide 90 guides the packs 1 when they are put into the box 2. The front and rear holding plates 9-1 and 9-2 are, then, moved slightly in the direction away from each other by respective holding plate drivers 16-1 and 16-2 (see FIGURE 3) to reduce the pressure on the five packs 1. The stuffing plate 13 is lowered to force the row of packs 1 into the bottom of the box 2. See FIGURE 14(h). Then, as shown on FIGURE 14(i), the side holding plate 35 is rotated back to its original prone position. The gates 7 are then closed by the gate driver 106, as shown in FIGURE 14(j). After that, the rest 17 of the box lift 98 with the box 2 containing the five packs 1 resting on it is lowered to the original standby position, where the box 2 is discharged to a discharge station. Then, a new box 2 is placed on the rest 17 of the box lift 98, the stuffing plate 13 returns to its original upward position, and the front and rear holding plates 9-1 and 9-2 return to their open positions. This completes one cycle of boxing operation. The same operation is repeated for putting another row of five packs 1 into the new box 2. Next, the input conveyor 4, the alignment conveyor system 58 and the pusher plate 11 are described with respect to their structures and operations. Input Conveyor 4 and Alignment Conveyor system 58 The input conveyor 4 may be a belt conveyor of synthetic rubber and moves at a high speed to convey packs 1. The packs 1 are supplied to the input conveyor 4 at substantially constant intervals from a preceding packing machine (not shown) and fed to the succeeding alignment conveyor system 58. However, due to some operating conditions of the packing machine, the intervals at which packs 1 are fed to the input conveyor 4 may vary. An article sensor 20 disposed at the inlet end of the alignment conveyor system 58 senses packs 1 passing in front of the sensor 20, as shown in FIGURE 1, which produces a pack representative signal when it senses a pack 1. The first and second stepping motors 8a and 8b for the alignment conveyor system 58 are actuated, in accordance with the pack representative signal, at such times that packs 1 are received in the respective ones of the pack receiving spaces 6 between adjacent fins 5, one for one space 6. The alignment conveyor system 58 includes four chain loops 18a, 18b, 21a and 21b, as shown in FIGURE 2. The chain loops 18a and 18b belong to a first group, and the chain loops 21a and 21b belong to a second group. The first group chain loops 18a and 18b are driven to travel by the first stepping motor 8a, while the second group chain loops 21a and 21b are driven by the second stepping motor 8b. Pairs of fin-mounting fittings 33 for holding the fins 5 are mounted to the chain loops 18a and 18b at corresponding locations. A pair of fin-mounting fittings 33 is used to detachably mount one fin 5 to the first group chain loops 18a and 18b. As shown in FIGURES 1 and 2, the first group chain loops 18a and 18b include a first set of twenty-one (21) fin-mounting fittings 33 with which at most twenty-one fins 5 can be mounted to the first group chain loops 18a and 18b, and a second set of another twenty-one fin-mounting fittings 33 with which at most twenty-one fins 5 can be mounted to the first chain loops 18a and 18b. The second set of fin-mounting fittings 33 is located halfway downstream from the first set. The second group chain loops 21a and 21b also have first and second sets each including twenty-one fin-mounting fittings 33. The first and second sets are spaced by half the length of the loops as the first and second sets of fin-mounting fittings 33 of the first group chain loops 18a and 18b. Thus, as shown in FIGURE 1, the alignment conveyor system 58 includes a first set of fins 5-1 and a second set of fins 5-2 both of which belong to the first group and are driven by the first stepping motor 8a, and a first set of fins 5'-1 and a second set of fins 5'-2 both of which belong to the second group and driven by the second stepping motor 8b. A first set of driving sprocket wheel wheels 22a and 22b coupled to a first driving shaft 24 for rotation therewith and a second set of follower sprocket wheel wheels 22c and 22d freely rotatable with respect to the shaft 24 are disposed at the inlet end of the alignment conveyor system 58. Also, a second set of driving sprocket wheel wheels 25c and 25d coupled to a second driving shaft 26 for rotation therewith and a first set of follower sprocket wheel wheels 25a and 25b freely rotatable with respect to the shaft 26 are disposed at the outlet end of the alignment conveyor system 58. The first group chain loop 18a is looped around the driving sprocket wheel wheels 22a and the follower sprocket wheel wheels 25a, and the other first group chain loop 18b is looped around the driving sprocket wheel wheels 22b and the follower sprocket wheel wheels 25b. Similarly, the second group chain loops 21a and 21b are looped around the driving sprocket wheel wheels 25c and the follower sprocket wheel wheels 22c and around the driving sprocket wheel wheels 25d and the follower sprocket wheels 22d. The first and second driving shafts 24 and 26 are coupled to the rotating shafts of the first and second stepping motors 8a and 8b via respective timing belts. As shown in FIGURE 1, each fin 5 is formed of a metal plate having an L-shaped cross-section and forms a pack receiving space 6 (6-1, 6'-1) with adjacent fins 5 as previously described. The length of each pack receiving space 6 along the direction of travel of the conveyor system 58 is slightly larger than the thickness of each pack 1 so that a pack 1 can be held erect with some spacing left between adjacent fins 5. The fins 5 extend radially in the loading station 43 at the inlet end of the alignment conveyor system 58 so that pack inlet openings 23 are formed between adjacent ones of the fins 5. Each of packs 1 fed from the input conveyor 4 slides into one of the openings 23. Packs 1 are conveyed with their bottom facing forward on the input conveyor 4 so that they can stand erect with their bottoms down in the pack receiving spaces 6. The number of the fins 5 in each set is six so that five packs, which the pusher plate 11 can push out of the alignment conveyor system 58 at a time, can be held. Next, the electrical circuit of the boxing system is described with reference to FIGURE 15. The boxing system includes a controller or CPU 27. The CPU 27 executes various arithmetic operations in accordance with programs stored in a memory 28 to drive the first and second stepping motors 8a and 8b, a third stepping motor 8c for operating the pusher plate 11, and other driving units. A setting display unit 30 is connected to the controller (CPU) 27, and is used to set, for example, the speeds of the chain loops 18a, 18b, 21a and 21b and, hence the fins 5 and 5' when packs 1 are received in the pack receiving spaces 6 and 6' from the input conveyor 4 at the loading station 43, and the speeds of the fins 5 and 5' moving between the loading station 43 and the unloading station 19. The unit 30 is also used to set operation timings in various processing steps, and other settings. Such settings may be displayed by the display unit 30. The speed at which the fins 5 and 5' are moved from the loading or unloading station 43 or 19 to the unloading or loading station 19 or 43 is higher than the speed at which they move when the pack receiving spaces 6, 6' receive packs 1 fed by the input conveyor 4. It should be noted that since, in the illustrated example, the fins 5, 5' are moved intermittently, the speed of the fins 5, 5' when packs 1 are placed in the pack receiving spaces 6, 6' is the average speed. The CPU 27 operates to cause one of the first and second groups of fins 5 and 5' to intermittently move so that the pack receiving spaces 6 or 6' can receive packs 1 properly from the input conveyor 4 (FIGURE 14(a)). At the same time, the CPU 27 causes the other of the first and second groups of fins 5 and 5' to stop or move at such a low speed as to be unloaded at the unloading station 19 while packs 1 in the pack receiving spaces 6 or 6' are pushed out of the conveyor system 58 by the pusher plate 11 (FIGURE 14(b)). The CPU 27 can be also arranged to operate in accordance with programs stored in the memory 28 to cause one set of fins (5-2 in the example shown in FIGURE 1) of one of the first and second fin groups 5-1, 5-2 and 5'-1, 5'-2 to stand by at a location immediately before the loading station, while one set of fins (5'-1 in the illustrated example) of the other fin group are in the loading station 43 for loading the pack receiving spaces (6'-1) with packs 1. The CPU 27 may also be arranged to operate to cause the other, loaded fin set (5-1) of the one fin group to stand by immediately before the unloading station 19, while the one fin set (5'-1) of the other fin group are being loaded with packs 1. Both or either one of the described standby operations may be employed. To realize it, the length of the chain loops 18a, 18b, 21a and 21b of the alignment conveyor system 58 is such that after, for example, the first fin set (5-1) of the first group is unloaded, the second fin set (5-2) of the first group can be in the standby position indicated in phantom before the loading station 43, and that the loaded first fin set (5'-1) can be in the standby position indicated by phantom before the unloading station 19. It should be note that in FIGURES 14(a)-14(e), the conveyor system 58 is shown schematically, and, therefore, the length of the chain loops are shown shorter for simplicity of explanation. Also, connected to the CPU (controller) 27 are an unloading station sensor 31, the article sensor 20 and a pusher sensor 42, which will be described later. Also, pulse generators 32a, 32b and 32c are connected to and controlled by the CPU 27 to provide pulses to be applied to drivers 39a, 39b and 39c, respectively, for driving the stepping motors 8a, 8b and 8c. Also, other sensors and drivers are connected to the CPU for controlling various units of the boxing system. The unloading station sensor 31 senses a set of fins 5 with a predetermined number, e.g. five, of packs 1 received in the associated spaces 6 when they arrived at the unloading station 19, and make the sensed fin set stop at the unloading station 19. The article sensor 20 senses a pack 1 when it is received in one pack receiving space 6 from the input conveyor 4 as shown in FIGURE 1, and produces a pack representative signal in response to which the chain loops are driven to bring the next pack receiving space 6 to the loading position. The pusher sensor 42 senses the pusher plate 11 when it is in its original position as shown in FIGURE 14(b). When the pusher plate 11 in the original position is sensed, the packs 1 in the pack receiving spaces 6 in the unloading station can be unloaded. The pulse generators 32a, 32b and 32c generate the numbers of pulses as instructed by the controller 27 and supply the generated pulses to the drivers 39a, 39b and 39c, respectively. The drivers 39a, 39b and 39c drive the respective stepping motors 8a, 8b and 8c to rotate by angles as determined by the numbers of pulses applied to the associated drivers 39a, 39b and 39c, respectively. The operation of the alignment conveyor system 58 of the boxing system with the above-described arrangement is now described with reference to the flow chart shown in FIGURE 16. When one fin set moves to the loading station 43, the CPU 27 makes a judgment as to whether a pack 1 is nut into the first or leading one of the pack receiving spaces 6 (Step S100). If a pack 1 is in the first space 6, the stepping motor 8a or 8b associated with that fin set is driven to forward the fin set by one pitch, i.e. by such an amount that the next or second space 6 comes to the loading position where a next pack 1 is put into the second space 6 (Step S102). Each time a pack receiving space 6 is loaded with a pack 1, the CPU 27 makes a judgment as to whether or not all of a predetermined number, five in the illustrated example, of spaces 6 have been loaded with packs 1 (Step S104). If the judgment is negative, Step S100 and Step S102 are repeated until all the spaces 6 are loaded with packs 1. When it is judged that all of the five spaces 6 have been filled with packs 1, the fin set is moved to the unloading station 19 where packs 1 in the spaces 6 are to be taken out (Step S106). In this case, the speed of the fin set moving from the loading station 43 to the unloading station 19 is higher than the speed of the fin set when they move in the loading station 43. In the unloading station 19, the respective packs 1 in the spaces 6 are pushed out of the alignment conveyor system 58 by the pusher plate 11. Then, the fin set is intermittently driven to move in such a manner as to stop at a plurality of preset positions (Step S108). After that, the fin set is moved to the loading station 43 at a higher speed than it is moved in the loading station 43. It is arranged such that the fin sets do not interfere or contact with the preceding fin set. Since the speed of the fins 5 travelling between the loading station 43 and the unloading station 19 is higher than the speed in the loading station 43, the traveling time can be reduced, which results in reduction of time required for loading and unloading of the alignment conveyor system with packs 1. Thus, according to the present invention, the efficiency of the boxing system can be improved. Since the first and second fin groups are driven independently, packs conveyed by one fin set of one of the two fin groups can be taken off at the unloading station 19 where they are stopping or moving at a low speed, while the fins 5 of a fin set of the other group are in the loading station 43 where they are intermittently moved for receiving packs in the respective pack receiving spaces 6 at a predetermined speed. Thus, it is not necessary to delay loading or unloading one fin group until other fin group has been unloaded or loaded, which results in reduction of the time required for one cycle of the loading and unloading of the alignment conveyor system 58. As described previously, one fin set of one fin group shown in phantom in FIGURE 1, which have been unloaded, can stand by for the loading at the standby position immediately before the loading station 43, and a fin set of one fin group shown in phantom in FIGURE 1, which are carrying packs 1, can stand by for the unloading at the standby position immediately before the unloading station, while a fin set of the other fin group are being loaded with packs 1. Thus, with the above-described arrangement, the loading and unloading of the alignment conveyor system 58 can be done continuously, which results in improvement of the efficiency of the boxing system Next, referring to FIGURES 2, 6(a)-6(c) and 7(a)-7(f), an arrangement 44 for mounting the fins 5 to the chain loops 18a, 18b, 21a and 21b in accordance with the present invention is described. The fin-mounting arrangement 44 is for detachably mounting the fins 5 to fin-mounting fittings 33 which are fixed to the first group chain loops 18a and 18b and the second group chain loops 21a and 21b. Each fitting 33 fixed to one of the first group chain loops 18a and 18b face one of the fittings 33 fixed to the other of the first group chain loops to form a pair for mounting one fin 5. Similarly, each fitting 33 fixed to one of the second group chain loops 21a and 21b face one of the fittings 33 fixed to the other of the second group chain loops to form a pair for mounting one fin 5'. In the illustrated example, twenty-one pairs of fin-mounting fittings 33 are used for each of the first and second fin groups. Since all of the fins 5 are mounted to the chain loops in the same manner, the fin-mounting arrangement 44 is described only for one fin 5 for simplicity of explanation. As shown in FIGURES 6(a)-6(c) and 7(a)-7(f), each of a pair of fin-mounting fittings 33 fixed to the respective ones of the chain loops 18a and 18b has a through-hole 45. Each fin 5 includes a partition 5a and a base 5b. A retainer 46 is attached to the fin 5 on each of the opposing sides thereof. Each fin-mounting fitting 33 is a generally rectangular plate and fixed to one of the chain loops 18a and 18b by means of a coupling member 49. Each of the through-holes 45 has a generally round wider opening 47 and a generally elliptic narrow opening 48, which are joined together. Each of the retainer 46 is disc-shaped and is secured by a nut 51 to the bottom end of each of a pair of shanks 50, which are spaced from each other and extend downward from the base 5b of the fin 5. The outer diameter of the retainer 46 is smaller than the inner diameter of the wider opening 47 of the through-hole 45, but it is larger than the inner diameter of the narrow opening 48. Accordingly, when the retainer 46 is inserted into the wider opening 47 of the through-hole 45 and moved to the narrow opening 48, the upper surface of the retainer 46 can contact the bottom surface of the periphery 48a of the narrow opening 48. Each shank 50 is disposed to extend through a bore through a shorter cylindrical member 52. The cylindrical member 52 supports a larger diameter flange 52a joined to the bottom end thereof. The cylindrical member 52 and the flange 52a are movable together along the length of the shank 50. A coil spring 53 is mounted on the member 52. The bottom end of the coil spring 53 is in contact with the flange 52a so as to press the flange 52a against the retainer 46 (FIGURE 6(a)). FIGURE 6(b) shows the cylindrical member 52 with the flange 52a slid upward against the spring force of the coil spring 53. The retainer 46, the shank 50, the nut 51, the cylindrical member 52, the flange 52a and the coil spring 53 form a mounting device 59 on the fin side. As shown in FIGURES 6(a) and 7(a), a short columnar detent 54 projects downward from the bottom end of one of a pair of fin-mounting fittings 33. The detent 54 is on the right-hand side fitting 33 in the example shown in FIGURES 6(a) and 7(a). The detent 54 is engaged by the retainer 46, which is pressed by the spring 53 against the bottom surface of the periphery 48a of the narrow through-hole portion 48, as shown in FIGURES 7(e) and 7(d), so that the retainer 46 cannot move into the wider opening 47, whereby the fin 5 does not slip off from the pair of fin-mounting fittings 33. When the retainer 46 is in engagement with the detent 54, the shank 50 is in contact with the inner periphery of the narrow opening 48 of the through-hole 45. Thus, the detent 54 acts also to position the fin 5 with respect to the pair of fittings 33. With the above-described arrangement of the fin-mounting arrangement 44, the fins 5 can be detachably mounted on respective pairs of fin-mounting fittings 33. For mounting a fin 5 to a pair of fittings 33, the fin 5 is placed with the free edge of the base 5b of the L-shaped fin facing forward. Then, as shown in FIGURES 7(a) and 7(b), a pair of retainers 46 of the fin 5 are forced into the wider openings 47 of the through-holes 45 in the respective fittings 33 against the force of the springs 53. As the fin is pressed down, the lower surfaces of the flanges 52a abut against the upper surfaces of the peripheries of the respective wider openings 47, and, therefore, the fin 5 receives a force tending to lift it upward. After that, as shown in FIGURES 7(c) and 7(d), the fin 5, being pressed down with the retainers 46 placed in the wider openings 47, is moved rightward (in FIGURES 7(c) and 7(d)) until the shanks 50 contact the right portion of the inner peripheries of the respective narrower portions 48. Since the fin 5 is pressed downward, the retainer 46 on the right side portion of the fin 5 can move over the detent 54. Then, the force to press down the fin 5 is removed so that the retainers 46 are pressed against the bottom surface of the portion of the fittings 33 around the peripheries 48a of the narrower portions 48 by the springs 53. In these positions, the retainers 46 are prevented from moving into the wider openings 47 by the detent 54, and, therefore, the fin 5 does not come off from the fin-mounting fittings 33. For dismounting the fin 5 from the fin-mounting fittings 33, the above-described procedures are followed in the opposite direction. Specifically, the fin 5 is pressed downward against the spring force given by the springs 53 so that the retainers 46 are removed from the bottom surfaces of the peripheries 48a of the narrower portions 48 of the through-holes 45. With the retainers 46 kept off from the bottom surfaces of the fittings 33, the fin 5 is moved leftward into the wider openings 47. Since the right retainer 47 is off the bottom surface of the right fitting 33, it can move over or below the detent 54. In this position, the fin 5 can be removed from the fin-mounting fittings 33, by pulling the retainers 46 off from the wider openings 47 of the respective through-holes 45. For accommodating packs 1 of a different thickness, the width of the pack receiving spaces 6, i.e. the dimension of the spaces 6 in the traveling direction of the fins 5, must be changed, which requires to change the locations where the respective fins 5 are mounted to the alignment conveyor system 58. As is understood from the above-description, with the fin-mounting arrangement 44 of the present invention, such change in location of the fins 5 can be done easily without resort to any tools, and the fins, after such changes in location, can be held in place by the detents 54 during the operation of the conveyor system 58. Also, it is easy to add or reduce the number of the fins 5 attached to the alignment conveyor system 58, which would be required for accommodating a different number of packs to be put in a box. Pusher Plate 11 and Arrangement for Operating It As best shown, for example, in FIGURES 3-5 and 14(b), the pusher plate 11 formed of metal includes a number of slits 12 therein for avoiding interference with the fins 5. Accordingly, for different numbers of the fins 5 in each fin set and for different widths of the spaces 6, different pusher plates 11 should be prepared. The pusher plate 11 is driven by the linear driver 55. In FIGURE 5, the side elevation of the linear driver 55 is shown. The linear driver 55 is mounted on a frame 37 of the boxing system and includes a reciprocating table 56, which moves on rails (not shown) along a path extending in parallel with the conveyor surface of the alignment conveyer system 58 and transverse to the traveling direction 57 of the alignment conveyor system 58. The reciprocating table 56 is adapted to move along the path over a distance of S1 shown in FIGURES 3 and 5. The pusher plate 11 is fixed to the reciprocating table 56 for movement with the table 56. The movement of the pusher plate 11 by the distance S1 from the original position shown in FIGURE 5 across the conveyor system 58 makes five packs 1 aligned on the alignment conveyor system 58 are pushed to the position between the front and rear holding plates 9-1 and 9-2. The reciprocating table 56 is driven by a third stepping motor 8c, which, in turn, is controlled by the CPU 27. Thus, the operation of the pusher plate 11 is controlled by the CPU 27. Being controlled by the CPU 27, the pusher plate 11 moves along a predetermined substantially horizontal path extending above and across the chain loops 18a, 18b, 21a and 21b of the alignment conveyor system 58 from the original position beside the conveyor system 58, when one of the four sets of fins 5 is in the unloading position 19, as shown in FIGURE 14(b). As a result, five packs 1 held in the spaces 6 between adjacent fins 5 are pushed onto the position on the gates 7 between the front and rear holding plates 9-1 and 9-2. The pusher plate 11 is arranged to return to its original position, moving along the predetermined path in the opposite direction, without interfering with the unloaded fins 5. Pack Holding Arrangement As shown in FIGURE 14(f), the five packs 1 pushed by the pusher plate 11 and aligned on the gates 7 are held in place by the stop plate 34, the front and rear holding plates 9-1 and 9-2, and the side holding plate 35. The front and rear holding plates 9-1 and 9-2 and the side holding plate 35 are driven by a pack holding arrangement. The pack holding arrangement includes the front and rear holding plate drivers 16-1 and 16-2 and the side holding plate driving arrangement 107 shown in FIGURE 3. As previously described, the front and rear holding plate drivers 16-1 and 16-2 drive the front and rear holding plates 9-1 and 9-2 toward and away from each other, respectively. Since the two drivers 16-1 and 16-2 have the same arrangement, only one of them is described. Accordingly, in this specification, the reference numeral "16" used alone denotes generally the holding plate drivers 16-1 and 16-2, and, similarly, the reference numeral "9" used alone denotes generally the front and rear holding plates 9-1 and 9-2. The driver 16 includes, as shown in FIGURES 8(a) and 8(b), a holding plate linear driver 63 for reciprocally moving the holding plate 9, a force detector 64 for measuring the force by which the plate 9 presses the row of packs 1, and plate stopping means for stopping the holding plate 9 provided by the control of the CPU 27 as represented by Steps S214 and S216 in the flow chart shown in FIGURES 17(a) and 17(b) which will be described later. The holding plate linear driver 63 includes a timing belt 65 as shown in FIGURE 8(a). A table 66 is connected to the timing belt 65 and is reciprocally movable on a linear guide rail 67. The timing belt 65 is looped around a follower timing pulley 68a and a driving timing pulley 68b secured to a rotary shaft of a fourth stepping motor 8d. The fourth stepping motor 8d when rotating in forward and reverse directions reciprocally moves the table 66. With the reciprocal motion of the table 66, the holding plate 9 moves back and forth. The fourth stepping motor 8d, the linear guide rail 67, the follower timing pulley 68a and the driving timing pulley 68b are secured to the frame 37. It should be noted, however, in place of the timing belt type linear driver 63, any other suitable driving arrangement may be used to drive the holding plate 9. The force detector 64 includes, as shown in FIGURES 8(a) and 8(b), a pair of springs 69 and a pressing force sensor 70. When the plate 9 abuts and presses against the front or rear end pack aligned on the gates 7 as it is driven forward by the driver 63, the springs 69 are compressed. The pressing force sensor 70 detects when the springs 69 are compressed to a predetermined length, which means a predetermined force is applied to the pack 1. Then, the sensor 70 produces a detection signal and applies it to the controller (CPU) 27. As shown in FIGURES 8(a) and 8(b), two parallel support rods 71 are coupled to the back surface of the holding plate 9 and are supported by bearings 72 so as to axially slide therein. The bearings 72 are secured to an L-shaped member 73, which, in turn, is coupled to the reciprocating table 66 by a sliding shaft 74. The shaft 74 is slidably supported by a bearing 105. The springs 69 are mounted over the respective support rods 71 and bias the holding plate 9 toward the packs 1 on the gates 7. Stoppers 15 are provided at the proximal ends of the two support rods 71 opposite to the holding plate 9, for preventing the rods 71 from slipping off from the bearings 72. The force sensor 70 is secured to one, the upper one in the example shown in FIGURE 8(a), of the stoppers 15 or the proximal ends of the support rod 71. The force sensor 70 includes a photosensor, which generates a signal when light incident on it is blocked by a shield 76. The signal generated by the force sensor 70 is applied to the CPU 27, which causes the rotation of the fourth stepping motor 8d and, hence, the movement of the holding plate 9 to stop. The shield 76 is attached to the horizontal portion of the L-shaped member 73 by means of a position adjusting arrangement 77 so as to be adjustable in position. The position adjusting arrangement 77 includes a guide shaft 78 secured to the L-shaped member 73 in parallel with the shaft 74, and a bolt 79a and a nut 79b for fixing the shield 76 to the L-shaped member 73 by fastening the nut 79b. The position of the shield 76 relative to the quiescent or original position of the sensor 70 shown in FIGURE 8(a) can be changed by unfastening the nut 79b and moving the shield 76 on the guide shaft 78. After the shield 76 is brought to a desired position, the nut 79b is fastened. In operation of the front and rear holding plate drivers 16-1 and 16-2, when packs 1 are pushed out from the alignment conveyor system 58 onto the gates 7 as shown in FIGURE 14(d), the fourth stepping motor 8d and a fifth stepping motor 8e, which drives the rear holding plate driver 16-2, are rotated in the forward direction to drive the front and rear holding plates 9-1 and 9-2 forward, i.e. toward each other. The forward rotation of the stepping motors 8d and 8e continues for a while after the plates 9-1 and 9-2 are brought into contact with the opposite ends of the row of packs 1, i.e. the front end pack and the rear end pack, on the gates 7. It causes the respective L-shaped members 73 coupled to the reciprocating tables 66 to compress the respective springs 69, so that the distances between the L-shaped members 73 and the associated holding plates 9-1 and 9-2 decrease. Then, the holding plates 9-1 and 9-2 press a predetermined number, five in the illustrated example, of aligned packs 1 with a preset force by virtue of the compressed springs 69. The position of the shields 76 relative to the force sensors 70 is such that the shields 76 block the sensors 70 from incident light when the springs 69 are compressed to give the preset force to the holding plates 9-1 and 9-2. The force sensors 70, when shielded, produce the sensor signals which cause the fourth and fifth stepping motors 8d and 8e to be stopped. In this way, the front and rear holding plates 9-1 and 9-2 can hold a predetermined number of aligned packs on the gates 7 with a preset force. The CPU 27 detects this fact and proceeds to the next step. With the above-described arrangement, packs 1 are not crushed even when the length of the row of aligned packs 1 is relatively large. Also, even when the length of the rows of aligned packs 1 is relatively short, packs 1 will not slip off from between the holding plates 9-1 and 9-2 since an appropriate force is given to them. Sometimes, packs 1 are filled with gas, e.g. inert gas, which results in variations in thickness among packs 1. The above-described holding arrangement can reliably hold a row of such packs with an appropriate force by the holding plates 9-1 and 9-2. The maximum amount of feed, X1, by which the holding plates 9-1 and 9-2 are fed forward, can be preset through the setting display unit 30 connected to the controller (CPU) 27 (FIGURE 15). The maximum amount of feed is such an amount that even when the holding plate linear driver 63 forwards tables 66 by that amount, the sensors 70 are not shielded by the shields 76 if the number of packs 1 on the gates 7 is smaller than the predetermined number. Whether the tables 66 have been fed by the maximum amount or not can be determined by measuring the angle of rotation of the stepping motor 8d and/or the stepping motor 8e, or counting the number of pulses supplied to the stepping motors. The CPU 27 is arranged to cause the fourth and fifth stepping motors 8d and 8e to stop when the tables 66 and, hence, the plates 9-1 and 9-2 are forwarded by the maximum amount X1. The CPU 27, then, may activate an alarm (not shown) to notify an operator that a smaller number of packs 1 have been supplied onto the gates 7 and may stop the operation of the boxing system. As shown in FIGURES 10 (a) and 10(b), the side holding plate driving arrangement 107 operates to hold the lateral sides of the row of aligned packs 1 of which the front and rear end are held by the front and rear holding plates 9-1 and 9-2. The lateral sides are held by the side holding plate 35 and the stop plate 34. The stop plate 34 is secured to the frame 37, and the side holding plate 35 is driven to swing by a sixth stepping motor 8f. The side holding plate 35 is rectangular in shape and secured to a shaft 81 by a mounting plate 80 as shown in FIGURE 10(a). The shaft 81 is rotatably supported by bearings 82 at its opposite ends. The bearings 82 are secured to a base 83. The sixth stepping motor 8f is mounted on the upper surface of the base 83 for swinging the side holding plate 35 about the shaft 81. A driving pulley 84 is mounted on the rotary shaft of the motor 8f, and a follower pulley 85 is fixed to the shaft 81. A timing belt 86 is looped around the drive and follower pulleys 84 and 85. As shown in FIGURE 10(b), a swing position sensor 87 is disposed on the base 83, which senses the original position of the side holding plate 35. The swing position sensor 87 senses a slit 88a in a disc plate 88 fixed to the shaft 81 to sense the original position of the side holding plate 35. The original position of the side holding plate 35 is indicated in phantom in FIGURE 10(b), which is substantially a horizontal position. When the side holding plate 35 is driven to swing to the vertical position indicated by solid lines, it can hold, together with the stop plate 34, the lateral sides of packs 1 on the gates 7. The side holding plate driving arrangement 107 is fixed to the frame 37 by securing the base 83 to rods 89 that are secured to the frame 37 as shown in FIGURE 5. FIGURE 10(c) is a plan view of the side holding plate driving arrangement 107. When five packs on the alignment conveyor system 58 are pushed to the gates 7 and aligned on them by the pusher plate 11, the side holding plate 35 in the horizontal position (FIGURE 14(e)) is driven to swing to the vertical position (FIGURE 14(f)) to thereby laterally hold the sides of the five packs in a row on the gates 7 between the plates 35 and 34. The swinging of the plate 35 to the vertical position can also align the sides of the respective packs 1. After the lateral sides of packs 1 are held by the side holding plate 35 and the stop plate 34, the front and rear ends of the row of the packs 1 are held between the front and rear holding plates 9-1 and 9-2. Thus, packs 1 on the gates 7 can be put into the box 2 without their edges and corners being caught by the flaps 2a and/or upper edges of the sides of the box 2. Thus, packs 1 can be placed neat in the box 2. With the above-described pack holding arrangement, even when the length of the row of aligned packs 1 is long or the total weight of aligned packs 1 is heavy, packs 1 can be reliably held between the pack holding plates 9-1, 9-2 and 35 and the stop plate 34 with such a small force that will not damage packs 1, so that a number of packs can be reliably and neatly put into the box 2. Next, the pack guide 90 shown in FIGURES 14(g)-14(i) is described. The pack guide 90 facilitates the putting of packs 1, held by the holding plates 9-1, 9-2 and 35 and the stop plate 34, into the box 2 by the stuffing plate 13. As shown in FIGURE 14(g), the pack guide 90 is disposed horizontally below the gates 7 and above the upper edges of the flaps 2a of the box 2. The guide 90 is shown in greater detail in FIGURES 11, 12(a) and 12(b). The pack guide 90 includes a guide frame 91, four guide plates 97 and coil springs (not shown) attached to the respective ones of the guide plates 97. The guide frame 91 is a rigid metal frame and is formed by four trapezoidal planar plates 91a, 91b, 91c and 91d jointed together to form a rectangular funnel as shown in FIGURE 11. The guide frame 91 has a rectangular outlet port 92b (FIGURE 12(a)) which is substantially the same size as the inlet opening of the box 2, and has a rectangular inlet port 92a larger than the outlet port 92b, which facilitates the putting of the packs 1 held by the holding plates 9-1 and 9-2 into the guide 90. The four guide plates 97 are hinged by respective shafts 99 and biased by the respective coil springs to assume the innermost positions (FIGURE 12(a)) in which they extend diagonally downward from the lower ends of the plates 91a-91d in the planes in which the plates 91a-91d lie. The lower edges of the plates 91a-91d form the outlet port edges 101a-101-d of the funnel-shaped guide frame 91. The four guide plates 97 cannot swing inward of the innermost positions, but they can swing outward by about 90°. FIGURE 12(b) shows one of the four guide plates 97 pushed outward by packs 1. In this position, the four guide plates 97 press the packs 1 inward. The rectangular outlet port 94 defined by the four guide plates 97 is slightly smaller than the opening of the box 2 so that the upper edges of the four substantially upright flaps 2a of the box 2 can be outside the four guide plates 97, as shown in FIGURE 12(a). As shown in FIGURES 11, 12(a) and 12(b), support plates 93a and 93c are attached to the outer surfaces of the plates 91a and 91c and are provided with mounting members 95, which are used to secure the pack guide 90 to the frame 37. The aligned packs 1 held by the holding plates 9-1 and 9-2 are pushed into the relatively large inlet port 92a of the pack guide 90 by the stuffing plate 13, as shown in FIGURE 13. The stuffing plate 13 pushes the packs 1 further down into the box 2 below the pack guide 90 through the relatively small outlet port 94 of the guide 90. When the packs 1 pass through the outlet port 94, they push the four guide plates 97 outward, as shown in FIGURE 12(b), so that the row of the packs 1 are pressed inward by the recovery force of the plates 97 given by the coil springs. Because of the funnel shape of the pack guide 90, edges, such as heat-sealed portions, and corners of packs 1 do not contact the upper edges of the box 2, and, therefore, packs 1 can be put into the box 2 without leaving empty spaces. Also, since the guide plates 97 can swing outward or inward to an extent for accommodating various sizes of aligned packs 1, packs 1 of various sizes can be put into a box 2 without being caught by the upper edges of the box 2. This makes it possible to use boxes 2 of smaller sizes than conventionally used ones, which, in turn, makes it possible to use a smaller area for storing the packed boxes 2. Further, as shown in FIGURE 13, the upper edges of the four flaps 2a of the box 2 when it is lifted to a position beneath the guide 90 are pressed outward by being guided along the outer surfaces of the corresponding guide plates 97. Thus, packs 1 do not contact the upper edges of the flaps 2a when they are put into the box and, therefore, are not damaged. In accordance with programs stored in the memory 28, the controller (CPU) 27 controls the operation of the fourth and fifth stepping motors 8d and 8e which reciprocally move the front and rear holding plates 9-1 and 9-2, and the sixth stepping motor 8f which drives the side holding plate 35 to swing. The number of packs 1 to be pushed out from the alignment conveyor system 58 can be set through the setting display unit 30 connected to the CPU 27. The setting display unit 30 is also used for setting timing for operating various drivers including the above-described ones as well as quantities of such operations. The pressing force sensors 70, the swing position sensor 87, and pulse generators 32d, 32e and 32f are also connected to the CPU 27. The pulse generators 32d, 32e and 32f generate pulses to be applied to drivers 39d, 39e and 39f. The stepping motors 8d, 8e and 8f are driven to rotate by the angles as determined by the numbers of pulses supplied to the associated drivers 39d, 39e and 39f from the respective pulse generators 32d, 32e and 32f in accordance with commands from the CPU 27. The operation of the above-described pack holding arrangement is described with reference to the flow chart shown in FIGURES 17(a) and 17(b). The processing shown in FIGURES 17(a) and 17(b) is executed by the CPU 27 in accordance with the programs stored in the memory 28. First, a predetermined number, five in the illustrated example, of packs 1 are supplied to a set of fins 5 of the alignment conveyor system 58. In Step S200, whether or not the fin set with packs 1 is in the unloading station 19 shown in FIGURE 14(b) is judged. If it is (i.e. the answer is YES), the pusher plate 11 is driven forward (Step S202), so that the five packs 1 held by the fins 5 are pushed onto the gates 7. Whether the pusher plate 11 has returned to the original position or not is then judged (Step S204), and, if it has returned to the original position, a judgment is made as to whether or not the pusher plate 11 has pushed five packs 1 a predetermined number of times, once in the example illustrated in FIGURES 14(a) through 14(j) (Step S206). If two rows of packs 1 are to be put in a box 2, as in the case shown in FIGURES 25(a)-25(d), the pusher plate 11 operates successively twice in one operating cycle to push out five packs 1 twice. A judgment is made as to whether or not the pusher plate 11 has been in a predetermined position in the return path to the original position (Step S208). If the pusher plate 11 is in the predetermined intermediate position, the sixth stepping motor 8f is driven to move the side holding plate 35 in the horizontal position shown in FIGURE 14(e) to the vertical position shown in FIGURE 14(f) (Step S210). Thus, the five packs 1 are aligned on the gates 7 and held between the side holding plate 35 and the stop plate 34. The side holding plate 35 is moved from the horizontal position to the vertical position after the pusher plate 11 is in the predetermined intermediate position in order to avoid collision of the pusher plate 11 returning to its original position with the side holding plate 35 swinging toward the vertical position. Then, the fourth and fifth stepping motors 8d and 8e are driven to move the front and rear holding plates 9-1 and 9-2 by the preset maximum amount X1 (Step S212). Whether the force sensors 70 have been blocked by the shields 76 and generated the representative signal, is judged (Step S214). If the force sensors 70 have generated the respective signals, the fourth and fifth stepping motors 8d and 8e are stopped to thereby stop the plates 9-1 and 9-2 from being forwarded further (Step S216). Thus, the five packs on the gates 7 are held between the front and rear holding plates 9-1 and 9-2 by an appropriate force. If the force sensors 70 are judged not to have generated the representative signals, a judgment is made in Step S218 as to whether the fourth and fifth stepping motors 8d and 8e have operated to forward the the table 66 (FIGURE 8(a)) by the preset amount X1. If the determination in Step S218 is YES, i.e. if the fourth and fifth stepping motors 8d and 8e have forwarded the respective holding plates 9-1 and 9-2 by X1, the stepping motors 8d and 8e and, hence, the holding plates 9-1 and 9-2 are stopped (Step S220). Then, the boxing system is stopped operating, and an alarm signal is generated (Step S222). This situation indicates that the number of packs 1 on the gates 7 is less than the predetermined number, or the total thickness of the packs 1 on the gates 7 has been reduced due to, for example, breakage in one or more packs. An operator should press an acknowledgment switch on the setting display unit 30 (Step S224), which results in the returning of the side holding plate 35 to the horizontal position (Step S226). The operator then takes steps to place the boxing system in the proper operating condition, by , for example, removing the packs 1 on the gates 7 and placing a predetermined number of new packs 1 between the front and rear holding plates 9-1 and 9-2 on the gates 7 manually or by any appropriate means (Step S228), and press the acknowledgment switch again (Step S230). This causes the side holding plate 35 to swing to the vertical position to hold the new packs 1 on the gates 7 (Step S232). After Step S216 or Step S232, the gates 7 are opened (Step S234). The stuffing plate 13 is lowered to place the five packs 1 into a box 2 which has been lifted to a position beneath the gates 7, and thereafter, the stuffing plate 13 is raised (Step S236). The side holding plate 35 is returned to the horizontal position, the gates 7 are closed, the front and rear holding plates 9-1 and 9-2 are returned to their respective retracted positions, and the box 2 with packs 1 put therein is lowered and outputted (Step S238). In Step S240, whether or not the pusher plate 11 is in the original position is judged. If the pusher plate 11 is in its original position, the processing returns to Step S200, and the operation described above is repeated. If it is judged that the pusher plate 11 is not in the original position in Step S240, Step S240 is repeated until the plate 11 returns to its original position, and, then, Step S200 is executed. A boxing system according to a second embodiment with which the present invention may be utilised is now described with reference to FIGURES 18-24. The boxing system of the second embodiment differs only in an alignment conveyor system from the boxing system of the first embodiment. Therefore, detailed description of the remaining portions will not be given. As shown in FIGURE 24, the alignment conveyor system 58 according to the first embodiment uses a plurality of fins 5 1 , 5 2 , 5 3 , 5 4 , 5 5 and 5 6 . Each of the fins 5 1 , 5 2 , 5 3 , 5 4 , 5 5 and 5 6 includes the mounting device 59 (FIGURE 6(a)) secured to the base 5b and spaced by a distance "a" from the partition 5a. All the fins 5 1 , 5 2 , 5 3 , 5 4 , 5 5 and 5 6 have the same distance "a". The fins 5 1 , 5 2 , 5 3 , 5 4 , 5 5 and 5 6 are mounted to the respective ones of pairs of fin-mounting fittings 33, which, in turn, are secured to the pairs of chain loops 18a and 18b, and 21a and 21b. In FIGURE 24, only the chain loop 18a is shown. As shown in FIGURES 23(a) and 23(b), the chain loop pair with the fins 5 1 , 5 2 , 5 3 , 5 4 , 5 5 and 5 6 mounted thereto is driven to intermittently move by a fixed pitch P 1 , which is equal to the distance between adjacent ones of the mounting devices 59. This pitch P 1 is equal to an integral multiple of the pitch F of the fin-mounting fittings 33. In the example shown in FIGURES 23(a), 23(b) and 24, the pitch P 1 is equal to 50mm (two (2) inches). Thus, the adjacent partitions 5a are spaced by 50mm (2 inches) for accommodating a pack 1 having a thickness of more or less smaller than 50mm (2 inches). This successively places the tip ends of the fins 5 1 , 5 2 , 5 3 , 5 4 , 5 5 and 5 6 in a loading position 40 in the loading station 43 to receive a pack 1 fed from the input conveyor 4. According to the second embodiment, the alignment conveyor system 58 is so arranged that fins can be mounted not only with the spacing E therebetween being equal to an integral multiple of the pitch F of the fin-mounting fittings 33, but also with the spacing E being equal to a non-integral multiple of the pitch F. The fin spacing is changed in order to accommodate packs of various thicknesses D. For this purpose, the distance E between adjacent fins or partitions which is different from an integral multiple of the pitch F (=25mm (1 inch)) of the fin-mounting fittings 33 is employed. In the illustrated example, the distance E is 64mm (2.5 inches). The illustrated example is arranged to convey packs 1 having a thickness of, for example, 56mm (2.2 inch). The illustrated example shown in FIGURE 20 uses the first, third and fifth fins 5 1 , 5 3 and 5 5 with the mounting device 59 spaced by the distance "a" from the partition 5a and second, fourth and sixth fins 60 2 , 60 4 , and 60 6 each having a similar mounting device 59 secured to its base 60b and spaced by a different distance "b" from its partition 60a. The different distances "a" and "b" are used because the spacing E between adjacent partitions is not an integral multiple of the pitch F of the fin-mounting fittings 33. Because of different distances "a" and "b" employed between the mounting device 59 and the partition, the distance between adjacent mounting devices 59 are such that the distance between the mounting devices 59 of the first fin 5 1 and the second fin fins 60 2 is P 1 (=50mm (2 inches)), the distance between the mounting devices 59 of the second fin fins 60 2 and the third fin 5 3 is P 2 (= 75mm (3 inches)), the distance between the mounting devices 59 of the third fin 5 3 and the fourth fin 60 4 is P 1 , the distance between the mounting devices 59 of the fourth fin 60 4 and the fifth fin 5 5 is P 2 , and the distance between the mounting devices 59 of the fifth fin 5 5 and the sixth fin 60 6 is P 1 . The values "a" and "b" are determined by the distance E between adjacent partitions (or the thickness of packs), the pitch F of the fin-mounting fittings 33, the radius of curvature of the turning path in the receiving station 43, etc. In the illustrated example, the value "b" is larger than "a" by 12.5mm (0.5 inches). As shown in FIGURES 21 (a) and 21(b), after a pack 1 is received on the second fin 60 2 at the loading position 40, the chain loops are forwarded by the pitch P 2 . This places the tip end of the third fin 5 3 at a loading position 41 (FIGURE 21(b)) in the loading station 43 so that a next pack 1 can be received on the third fin 5 3 . Then, the chain loops are fed by the pitch P 1 , which places the tip end of the fourth fin 60 4 at the loading position 40, so that another pack 1 can be received on the fourth fin 60 4 from the input conveyor 4. In this way, the pitch by which the respective fins 5 and 60 are moved alternates between P 2 and P 1 . The same procedures are repeated to load the fin set with five packs 1. The loading positions 41 and 40 in the loading station 43 are such that the tip ends of the fins 5 and 60 can properly receive a pack 1 in a straight position without causing the pack 1 to be bent, as shown in FIGURES 21 (a) and 21(b), and FIGURES 23(a) and 23(b). Now, the reason why the tip ends of the fins 60 2 , 5 3 , 60 4 , 5 5 and 60 6 can be placed properly in the loading positions 40 and 41 is described with reference to FIGURES 21(a), 21(b), 23(a) and 23(b). The alignment conveyor system 58 and the input conveyor 4 are in such positional relation that, as shown in FIGURES 23(a) and 23(b), the tip ends of the second through sixth fins 5 can be properly placed in the loading position 40 when the distance "a" between the mounting device 59 and the partition 5a is employed for all fins 5 and the pitch by which the chain loops are intermittently moved is an integral multiple of the pitch F of the fin-mounting fittings 33. FIGURE 21(a) illustrates the second fin 60 2 with its tip end positioned at a loading position 40 in the loading station 43 in the turning path when the first fin 5 1 is in the position forward by P 1 (= 50mm (2 inches)) from the loading position 40. (It is so programmed that the first fin 5 1 does not stop at the loading position 40 because it is the fin 60 2 that first receives a pack.) Since the distance E between the partition 5 1 a of the fin 5 1 and the partition 60 2 a of the fin 60 2 is 64mm (2.5 inches), the chain loops or the fin 5 1 should have been moved by 64mm (2.5 inches), and therefore, the fin 5 1 should be further moved by a shortage of 12.5mm (0.5 inches). However, since the distance between the mounting device 59 and the partition 60 2 a of the fin 60 2 is "b" for adaptation of the mounting device 59 for the fin-mounting fittings 33, the tip end of the fin 60 2 can be in a position advanced from the position the tip end would assume when the distance "a" is employed, by the difference between "b" and "a", i.e. (b - a) =12.5mm (0.5 inches). In other words, by shifting forward the position of the mounting device 59 of the fin 60 2 by (b-a), the tip end of the fin 60 2 in the arcuate turning path is lifted upward to compensate for the shortage of 12.5mm (0.5 inches), so that the tip end can be positioned properly at the loading position 40. FIGURE 21(b) shows the second fin 60 2 in the position it assumes when the chain loops advance by P 2 (=75mm (3 inches)) from the position where the tip end of the second fin 60 2 was in the loading position 40. In this state, the tip end of the third fin 5 3 is at a loading position 41 in the loading station 43, where the chain loops have advanced from the position where the tip end of the first fin 5 1 is in the loading position 40 by just the twice the distance E between the partitions of adjacent fins, which is an integral multiple (five times) of the pitch F of the fin-mounting fittings 33. The tip end of the third fin 5 3 can be positioned properly at the loading position 41 because the distance of the partition 5 3 a and its mounting device 59 is "a". In the same manner, the tip ends of the fourth and sixth fins 60 4 and 60 6 can stop at the loading position 40 shown in FIGURE 21(a), and the fifth fin 5 5 can stop at the loading position 41 shown in FIGURE 21(b), where they can properly receive packs 1. FIGURES 22(a) and 22(b) show the positions where the six fins 5 1 , 60 2 , 5 3 , 60 4 , 5 5 and 60 6 , which have the distance E between the partitions of 2.5 inches, would assume in the loading station 43 if the chain loops were intermittently moved by 64mm (2.5 inches). It should be noted that only three of the six fins, namely, the fins 5 1 , 60 2 and 5 3 , are shown in FIGURES 22(a) and 22(b) for simplicity of illustration. The tip ends of the third and fifth fins 5 3 and 5 5 stop at the loading position 41' shown in FIGURE 22(b), and the tip ends of the second, fourth and sixth fins 60 2 , 60 4 and 60 6 stop at the loading position 40 shown in FIGURE 22(a). The first fin 5 1 passes both loading positions as in the case illustrated in FIGURES 21(a) and 21(b). If the system is so arranged that the tip ends of the even-numbered fins 60 2 , 60 4 and 60 6 are placed at the substantially appropriate loading position 40 as shown in FIGURE 22(a), the tip ends of the odd-numbered fins 5 3 and 5 5 stops at the position 41' shown in FIGURE 22(b), which is lower by a relatively large distance than the output end of the input conveyor 4. At such loading position 41', packs 1 fed by the input conveyor 4 cannot be properly received on the fins 5 3 and 5 5 , but they may be bent before they are received on the fins 5 3 and 5 5 . As is understood from the above description, if the chain loops are moved by a step of 64mm (2.5 inches) even when the distance E between adjacent partitions of fins is 64mm (2.5 inches), packs 1 cannot properly be received on the respective fins, as shown in FIGURES 22(a) and 22(b). Accordingly, the amount by which the chain loops 18a and 18b, and the chain loops 21a and 21b are moved intermittently must be varied in accordance with the distance between adjacent ones of the mounting devices 59. Although only one fin set has been described with reference to FIGURES 20 through 24, the same is applicable to the remaining fin set. According to the second embodiment, the fins of each set are mounted to the chain loops with the distance E between adjacent partitions determined in accordance with the thickness D of packs 1 (FIGURE 20). For example, when the thickness of the packs 1 is about 56mm (2.2 inches), the fins 5 and 60 are alternately mounted to the fin-mounting fittings 33 with the distance E set to 64mm (2.5 inches). In this case, a value of 2.5 is set through the setting display unit 30, which is coupled to the CPU 27. By this setting, the first and second sets of fins 5 and 60 of the first and second groups can be advanced intermittently so as to properly receive packs 1 successively from the input conveyor 4, as illustrated in FIGURES 21(a) and 21(b). In the example shown in FIGURE 24, the thickness D of the packs 1 is about 43mm (1.7 inches), and the fins 5 are mounted to the fittings 33 with the distance E of 50mm (2.0 inches). In this case, a value of 2.0 is set through the setting display unit 30, so that the chain loops are moved infermittently to properly receive packs having the thickness D of about 43mm (1.7 inches) successively fed from the input conveyor 4, as shown in FIGURES 23(a) and 23(b). Now, the operation of the alignment conveyor system 58 is described with reference to the flow chart shown in FIGURE 18. The flow chart is for the system in which the thickness D of packs 1 is about 56mm (2.2 inches), a set of fins mounted to the fin-mounting fittings 33 include six fins 5 1 , 60 2 , 5 3 , 60 4 , 5 5 and 60 6 (FIGURE 20), and two such fin sets are mounted to the fin-mounting fittings 33 of each of the chain loop pair 18a, 18b and the chain loop pair 21a, 21b. The operation of the conveyor system 5 can be achieved by setting a value of 2.5 through the setting display unit 30. Thus, the distance E between the partitions 5a and 60a of adjacent fins 5 and 60, which is equal to 64mm (2.5 inches), is 2.5 times the pitch F (= 1 inch) of the fin-mounting fittings 33. First, the controller (CPU) 27 causes the second fin 60 2 , in one of the two fin sets of a predetermined one of the first and second fin groups to advance to the loading position 40 in the loading station 43 as shown in FIGURE 21(a) (Step S300). Then, the CPU 27 makes a judgment as to whether a pack 1 has been put into the space 6 formed between the partitions 5 1 a and 60 2 a of the fins 5 1 and 60 2 (Step S302). If a pack 1 has been received, it is judged whether that fin set has been stopped in the loading station 43 an odd number of times (Step S304). Since it is the first time, i.e. or an odd-numbered time, that that fin set has stopped in the loading station 43, the associated chain loop pair 18a, 18b, for example, are advanced by 75mm (three inches) by appropriately activating the associated stepping motor 8a. It places the tip end of the third fin 5 3 in the loading position 41 as shown in FIGURE 21(b) (Step S306). Next, a judgment is made as to whether that fin set has stopped a predetermined number, five in the illustrated embodiment, in the loading station 43 (Step S308). In other words, the CPU 27 makes a judgement as to whether a predetermined number, five in the illustrated example, of packs 1 have been put into the respective spaces 6 formed between adjacent fins 5 1 , 60 2 , 5 3 , 60 4 , 5 5 and 60 6 . Since it is the second time that that fin set has stopped when the tip end of the third fin 5 3 has been brought to the loading position 41, the process returns to Step S302, and Steps S302 and S304 are repeated. This time, however, the answer to the query made in Step S304 is NO, the associated stepping motor 8a is driven to advance the chain loops 18a and 18b by 50mm (two inches) (Step S310), which causes the tip end of the fourth fin 60 4 to be placed in the loading position 40 shown in FIGURE 21(a). After that, the CPU 27 makes a judgment as to whether that fin set has stopped five times in the loading station 43, i.e. whether five packs 1 have been put into the respective ones of the five spaces 6 (Step S308). Steps S302, S304 and S306 or S310 are repeated if the answer to the query made in Step S308 is NO. When that fin set has stopped the fifth time in the loading station 43, and all of the five spaces 6 have been loaded with packs 1, the answer to the judgment made in Step S308 becomes YES, that set of fins 5 1 , 60 2 , 5 3 , 60 4 , 5 5 and 60 6 is forwarded to the unloading station 19 (Step S312). Thereafter, the five packs 1 held in the spaces 6 between adjacent ones of the six fins are pushed out of the chain loops 18a and 18b of the alignment conveyor system 58 by the pusher plate 11, and that fin set is forward to the next position (Step S314). After that, the next fin set is forward to the loading station 43 until the tip end of the second fin 60 2 is in the loading position 40 shown in FIGURE 21(a), and the same processing as described above is repeated. The forwarding of each fin set is controlled in such a manner that it does not interfere or contact with the preceding one. Now, the operation of the alignment conveyor 58 is described with reference to the flow chart shown in FIGURE 19. The flow chart shown in FIGURE 19 is for explaining the operation of the conveyor system 58 shown in FIGURE 24, in which the thickness D of each pack 1 is about 43mm (1.7 inches) and two fin sets each including six fins 5 1 , 5 2 , 5 3 , 5 4 , 5 5 and 5 6 mounted to the fin-mounting fittings 33 mounted to each of the chain loop pairs 18a and 18b and 21a and 21b. The operation can be achieved by setting a value of "2.0" through the setting display unit 30. The distance E between partitions 5a of adjacent ones of the six fins 5 is equal to 50mm (2 inches), which is twice the pitch F (= 25mm (1 inch)) of the fin-mounting fittings 33 attached to the chain loops 18a, 18b and 21a, 21b. First, the controller (CPU) 27 causes one of two sets in one of the four groups of fins to be brought into the loading station 43, where the tip end of the second fin 5 2 is placed in the loading position 40 as shown in FIGURE 23(a) (Step S400). Whether a pack 1 is put into the spacing 6 between the first and second fins 5 1 and 5 2 is judged by the CPU 27 (Step S402). If the space 6 is loaded with a pack 1, the associated chain loop pair 18a and 18b, for example, is advanced by 50mm (two (2) inches) by driving the associated stepping motor 8a, so that the tip end of the third fin 5 3 is brought in the loading position 40 as shown in FIGURE 23(b) (Step S404). Then, a judgment is made as to whether that fin set has been stopped in the loading station 43 a predetermined number, five in the illustrated example, of times (Step S406). Since it is the second stop of that fin set that the tip end of the third fin 5 3 stops, which is less than the predetermined number of times, the processing in the respective Steps S402-S406 is repeated. When the fin set has stopped five times in the loading station 43 so that five packs 1 have been put into the respective spaces 6, the fin set is forwarded to the unloading station 19 (Step S408). Then, the pusher plates 11 pushes out the five packs 1 in the five spaces 6 out of the alignment conveyor system 58, and the fin set is forwarded to the next position (Step S410). After that, the tip end of the second fin 5 2 of the next fin set which belongs to the other fin group is brought to the loading station 40 shown in FIGURE 23(a), and the processing in Steps S400-S410 is executed in the manner as described above. As described above, the amount by which the chain loop pair is forwarded in one step of the intermittent forwarding of the alignment conveyor system 58 depends on whether the distance E between the partitions of adjacent fins is an integral multiple (e.g. 1, 2, 3, ...) or a multiple with a decimal (e.g. 1.1, 1.2, 1.3, ...) of the pitch F of the fin-mounting fittings 33 on the chain loop pair 18a and 18b and 21a and 21b. If, as shown in FIGURE 20, the thickness D (e.g. 56mm (2.2 inches) of the packs 1 to be handled is slightly less than a predetermined multiple (e.g. 2.5), which is greater than one and has a decimal portion, of the pitch F (e.g. 25mm (1 inch) of the fin-mounting fittings 33, the distance E between adjacent partitions of, for example, the fins 5 1 and 60 2 , can be the predetermined multiple, i.e. 2.5 times the pitch F of the fittings 33. Accordingly, it is necessary to alternately mount to the fin-mounting fittings 33, a plurality, two in this case, of different types of fins 5 and 60 having the distances "a" and "b", respectively, between the mounting device 59 and the partitions 5a and 60a. In this case, the mounting devices 59 of the first and second fins are spaced by the distance P 1 , the mounting devices 59 of the second and third fins are spaced by the distance P 2 , and the mounting devices 59 of the third and fourth fins are spaced by the distance P 1 . In this manner, the distance between the adjacent mounting devices 59 alternates between P 1 and P 2 . The chain loop pair is then advances intermittently by P 1 and P 2 , alternately. This makes the tip ends of the fins 60 and 5 be placed in the respective loading positions 40 and 41 in the turning path, where packs 1 can be properly received in the respective pack receiving spaces 6. The thickness D (e.g. 43 mm (1.7 inches)) of packs 1 to be handled may be slightly less than a multiple (e.g. two) of the pitch F (e.g. 25mm (1 inch)) of the fin-mounting fittings 33, as in the case shown in FIGURE 24. In this case, the distance E between adjacent partitions 5a of the respective fins 5 1 -5 6 can be an integral multiple (e.g. two) of the pitch F of the fin-mounting fittings 33. Accordingly, it is possible to use a plurality, e.g. six in the illustrated example, of fins of the same structure with the distance "a" between the mounting device 59 and the partition 5a. Thus, the mounting devices of the fins 5 1 , 5 2 , 5 3 , 5 4 , 5 5 and 5 6 can be mounted to the respective fittings 33 with the same pitch (e.g. 2F). In this case, the fin set is advanced stepwise by a fixed pitch (= 2F = 50mm (2 inches) in the illustrated embodiment), and the tip ends of the respective fins 5 2 , 5 3 , 5 4 , 5 5 and 5 6 can be placed properly in the loading position 40 in the turning path shown in FIGURES 23(a) and 23(b). As described above, independent of the mounting pitch F of the fin-mounting fittings 33, the tip ends of the fins can be placed in the loading position in the loading station appropriate for receiving a pack 1, by using either fins 5 or fins 5 and 60, dependent on the thickness of the packs 1 to be handled, and advancing the fins by a predetermined fixed amount as shown in FIGURES 23(a), 23(b) and 24, or alternately by predetermined different pitches (e.g. 2F and 3F) as shown in FIGURES 20, 21(a) and 21(b). With this arrangement, as shown in FIGURES 20 and 24, packs 1 can be held adjacent to each other and conveyed, and they can be pushed out from the alignment conveyor system 58 onto the gates 7, without being bent since packs 1 can be held with little gap between adjacent ones. Then, the front and rear holding plates 9-1 and 9-2 can hold, without fail, the packs 1 which are closely spaced and erected on the gates 7, and can put them into the box 2. As described above, packs having a thickness less than an integer, one or greater, plus 0.5 times the pitch of the fin-mounting fittings 33 can be handled by using only two types of fins, e.g. fins 5 and 60, having different distances between the mounting devices 59 and the partitions. Thus, the number of types of fins to be prepared can be small, two in the illustrated examples, and, therefore, the manufacturing of the fins is easy. Also, the number of the types of fins to be stocked can be small. The length of the bases 5b (60b) on which packs are placed should be slightly less than the distance E between adjacent partitions 5a (60a). In the above-described embodiments, the number of fins used is six, but a different number of fins may be used to convey a different number of packs in a time. Also, the system can put two or more rows of packs in a box 2, as in the prior art shown in FIGURES 25(a) through 25(d). Also, a row or rows of packs may be stacked in a box 2. For these and other modifications, the shape of the pusher plate 11, the shape and distance of the front and rear plates 9-1 and 9-2, the timing of the lowering and lifting the stuffing plate 13, etc. may have to be modified. In the descried systems packs 1 are supplied to the alignment conveyor system 58 one by one in a row. Although not shown, however, two or more packs 1 may be fed side by side from the input conveyor 4 into each of the pack receiving spaces 6 on the alignment conveyor system 58. In such a case, packs are pushed out from the alignment conveyor system 58 in two or more rows onto the gates 7. In this case, too, the shape of the pusher plate 11, the shape of the front and rear plates 9-1 and 9-2, the timing of the lowering and lifting the stuffing plate 13 etc. may have to be modified. Packs 1 can be put in a box 2 with one lateral side down. In the described embodiments, each of the first and second groups of fins includes two sets of fins, but it may include only one set. The controller (CPU) 27 may be arranged to control the system in such a manner that when one fin set of one of the first and second fin groups is in the unloading station 19, one fin set of the other fin group loaded with a predetermined number of packs 1 can stand by for the unloading immediately before the unloading station 19, which results in improvement of the boxing efficiency of the boxing system. The force sensors 70 may have a structure shown in FIGURES 9(a) and 9(b), instead of the structure shown in FIGURES 8(a) and 8(b). FIGURES 9(a) and 9(b) are front and side views of one of the force sensors 70. This alternative structure includes a load cell 100 for detecting the magnitude of the force with which the associated holding plate 9 presses the row of packs 1 and generating a magnitude-representative signal. The load cell 100 is coupled between the sliding shaft 74 and the holding plate 9. The holding plate 9 is driven by the holding plate linear driver 63 to forward to continuously press the end pack 1. The controller 27 stops the driving of the holding plate linear driver 63 in response to the magnitude representative signal the load cell 100 generates when the holding plate 9 presses the pack 1 with a preset force. In place of the load cell 100, a piezoelectric device may be used. Alternatively, a pressure sensor may be used in place of the load cell 100, together with a piston and a cylinder filled with a fluid. One of the piston and the cylinder is coupled to the sliding shaft 74 and the other to the holding plate 9. The pressure sensor is connected in such a manner as to be able to sense the pressure applied to the fluid. The fins used in the described embodiments are the fins 5-1, 5-2, 5'-1 and 5'-2 for 25mm (one inch) for the distance E between adjacent partitions of 25mm (1 inch) (FIGURES 1 and 2), the fins 5 for 50mm (two inches) for E of 50mm (two inches) (FIGURE 24), and the fins 5 and 60 for (64 mm) (2.5 inches) for E of 64 mm (2.5 inches) (FIGURE 20), but fins for 3, 4, (33 or 71mm) (1.3 or 2.8 inches) for example, may be used for the distance E of 3, 4, (33 or 71mm) (1.3 or 2.8 inches) may be used instead for receiving, from the input conveyor 4, packs 1 having a corresponding thickness. In this case, the amount of intermittent movement of the fins in the standby position before the loading station 43 to place them in the loading station is set to a value equal to or approximately equal to the distance between the mounting device 59 of the fin in the loading station and the mounting device 59 of the immediately succeeding fin. Further, in the described embodiments, one or more of fin sets are put in a standby position before the loading station or the unloading station. However, the present invention can be also applicable to an alignment conveyor system in which fin sets do not stand by for the unloading or loading before the unloading or loading station. The above-described arrangement, in which fins with a variable spacing between adjacent mounting devices 59 with the fins intermittently forwarded with a corresponding variable pitch, can be also applied to a conveying system having only one chain conveyor.

Claims: A conveyor apparatus (58) comprising: conveying means (18a,18b,21a,21b) traveling in a loop including upper and lower paths with turning paths therebetween; a plurality of partitioning means (5) mounted to said conveying means (18a,18b,21a,21b), each of said partitioning means (5) being detachably mounted to said conveying means by means of partitioning means mounting means (44), and being spaced from adjacent partitioning means (5) along a conveying direction to provide spaces (6) therebetween sufficient to hold articles (1) therein, successive ones of said spaces (6) being loaded with articles (1) when said partitioning means (5) pass through a predetermined loading position in the turning path from said lower path to said upper path; driving means (8a,8b) for driving said conveying means; and control means (27) for changing the amount by which said partitioning means (5) are advanced to receive articles (1) in said loading position characterized in that each of said partitioning means (5) includes a partition (5a) standing erect and extending in the direction perpendicular to said conveying direction, and a base (5b) connected to said partition; and each of said partitioning means mounting means (44) comprises a mounting device (59) secured to said base of said partitioning means (5), and an engaged device (33) adapted to be engaged by the associated mounting device (59), said engaged devices (33) being secured to said conveying means (18a,18b,21a,21b) along said conveying direction with a fixed pitch; said engaged devices (33) being arranged such that plural types of partitioning means (5) with different distances between the mounting devices (59) and the partitions thereof can be mounted to said conveying means (18a,18b,21a,21b); and said control means (27) changing the amount by which said partitioning means (5) are advanced in accordance with said distance between said mounting devices (59) of adjacent ones of said partitioning means (5). A conveyor apparatus according to Claim 1 wherein two different types of partitioning means (5) are used. A conveyor apparatus according to Claim 1 or Claim 2 wherein each of said partitioning means mounting means (44) comprises: a through-hole (45) formed in either of said conveying means (18a,18b,21a,21b) and said partitioning means (5) , having wider (47) and narrower (48) openings communicating with each other; a partitioning means retainer (52) mounted by an elongated member (50) to the other of said conveying means (18a,18b,21a,21b) and said partitioning means (5) , said retainer (52) being adapted to be inserted into said wider opening (47) of said through-hole (45) and, then, moved into said narrower opening (48) to contact the periphery (48a) of said narrower opening (48); a spring (53) adapted to press said retainer (52) in said narrower opening (48) against said periphery (48a) of said narrower opening (48); and a detent (54) for preventing said retainer (52) pressed against said periphery (48a) of said narrower opening (48) from moving into said wider opening (47).

Inventors: OKABE OSAMU, TAKEMOTO FUMIHIKO, OKABE, OSAMU, TAKEMOTO, FUMIHIKO
Applicants: YAMATO SCALE CO LTD, YAMATO SCALE CO., LTD.
Application year: 1999
Main classification: B65G47
IPC codes: B65G47, B65B5, B65B35, B65G17