JPS6251801B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a flap folding device for cardboard sheet pieces. More particularly, the present invention relates to a cardboard sheet installed at an intermediate position of a conveyor device for delivering pre-cut and formed cardboard sheet pieces to an intermittent operating machine for packing tobacco into subsequent cigarette packs with rotating lids. This invention relates to a flap folding device for pieces.

[Conventional technology]

JP-A-50-42099 discloses an intermittent operating machine for packing cigarettes into small cigarette boxes with rotating lids. Furthermore, Japanese Patent Application Laid-Open No. 15692/1984 provides a tapered bending plate, and by engaging the sheet piece in forward movement with the tapered bending plate, the sheet piece can be bent. The present invention discloses a packaging device capable of carrying out the packaging.

For example, in an intermittent operating machine that packs cigarettes into small cigarette boxes with rotating lids, such as the one described in the above-mentioned Japanese Patent Application Laid-open No. 50-42099, a pre-cut and formed cardboard sheet piece is delivered to the machine. An incremental feed conveyor is used in which, during the conveyance, at least one folding operation is performed on the sheet piece around a predetermined fold line. Generally, the purpose of this operation is not to give a three-dimensional shape to the cardboard sheet piece, but rather to fold the edges of the cardboard sheet piece and glue them to the back of the periphery of the main body, making it double. The purpose is to increase strength. Particularly in cigarette packets with rotating lids, the edge portion or flap portion, which is doubled and reinforced by folding and gluing, becomes the front surface of the lid, and this portion is the only part of the cigarette packet that receives force during opening and closing. It's a place.

In the conventional stepwise feed conveyor described above, a helical fixed folding member is arranged at a predetermined position along the feed path of the cardboard sheet piece, and the fixed folding member is fixed during the forward movement of the sheet piece. The flap is adapted to be folded by engaging the helical-shaped fixed folding member, i.e. the helical fixed folding member progressively folds the flap around the set fold line towards the back of the sheet body. It was hot.

[Problem that the invention seeks to solve]

When the edge flap of a cardboard sheet piece is folded using a fixed helical bending member in this manner, various problems arise, including poor bending accuracy and wrinkles in the folded sheet piece. These drawbacks are mainly due to the fact that the cardboard sheet piece is folded while moving and is not folded all at once along the fold line, but successively at various positions along the fold line. It is something to do.

These drawbacks can be ignored to some extent when the sheet piece feeding frequency is below a relatively low value, but
The very high frequencies, for example the seven or more pieces per second required by modern intermediate packaging machines, are no longer acceptable.

The object of the present invention is to align and position a piece of cardboard sheet that is being fed step by step at a stop position, hold it in an immovable state, and fold it at once about 180 degrees around a fold line. It is an object of the present invention to provide a flap folding device for cardboard sheets, which can perform folding very accurately even during high-speed feeding by bending.

[Means for solving problems]

The above-mentioned problem has been solved by the present invention, in which a piece of cardboard sheet installed on a conveyor device for delivering pre-cut and formed cardboard sheet pieces to an intermittent operating machine for packing cigarettes into small cigarette boxes with rotating lids. This is accomplished with a flap folding device. This flap-folding device for cardboard sheet pieces includes a sliding support surface for the cardboard sheet pieces installed on a fixed base extending in the longitudinal direction of the conveyor, and a constant feeding along the sliding support surface. a stepwise feeding device that advances the cardboard sheet piece to a predetermined position in the direction by a stepwise motion; and a sheet piece flap portion that extends outward from a folding line parallel to the transport direction of the surface of the cardboard sheet piece and sequentially engages with the sheet piece flap portion. This device is designed to fold in the flap portion of the sheet piece. The bending device includes a fixed plate constituting a bending bar whose free end edge extends from the sliding support surface member in parallel to the feeding direction at a predetermined position along the feeding path of the sliding support surface member. At the same time, a sheet receiving and abutting member for aligning the bending line on the surface of the sheet to a proper position corresponding to the extending free end edge of the fixing plate cooperates with the opposite end of the flap portion of the sheet. is installed on the sliding support surface member. Furthermore, the sheet piece flap portion bending actuating means installed on the fixed base at a lateral position of the sliding support surface member faces the overhanging free end edge of the fixed plate and extends in a direction perpendicular to the conveying direction. A driving tongue is provided, the tip edge of the tongue is formed substantially parallel to the free end edge of the projection, and the driving action is performed in parallel with the stepwise feeding device within a plane perpendicular to the feeding direction. A first actuating part that moves vertically with respect to the fixed plate and a second actuating part that moves horizontally back and forth.
The position of the folding tongue is controlled by the combined actuation movement provided by the actuating part, and the sheet piece holding actuating part which presses the cardboard sheet piece on the fixed plate also controls the stepwise feeding. The tip of the bending tongue is firstly moved mainly by the movement of the second actuating part during the stepping period of one working cycle of the step feeding through these three actuating parts. contacting and advancing the free edge of the sheet flap portion to complete the cardboard sheet alignment positioning operation, and then activating the sheet retaining actuator at the beginning of the resulting stop period of the operating cycle; The aligned and positioned cardboard sheet pieces are held immovably on the fixed plate, and then, mainly due to the movement of the first actuating part, a bending tongue is attached to the upper surface of the sheet piece flap portion that protrudes from the free end edge of the fixed plate. is pressed down 90 degrees from above while making contact with the tip of the sheet, and then the flap portion of the sheet piece is folded approximately 180 degrees around the free extending edge of the fixing plate mainly by the movement of the second actuating portion. Finally, the first actuating part and the second actuating part are returned to their initial positions upward and outward, and at the same time, the sheet piece holding actuating part is actuated from the holding position to the release position.

[Effect]

The cardboard sheet piece according to the present invention is first folded at the flap part of the sheet piece by a step feeding device on a sliding supporting surface member formed on a fixed base according to a stepwise operation cycle in which stepwise motion and stop are repeated. It is fed to the bending section. Next, the cardboard sheet flap folding device installed at the sheet flap folding portion sequentially engages the sheet flap portions extending outward from the folding line to align and position the sheet flap portions approximately 180 degrees. Performs the folding operation of degrees. That is, when the cardboard sheet piece comes onto the bending fixing plate provided at a predetermined position, the tip of the folding tongue piece first advances the cardboard sheet piece toward the sheet piece receiving and abutting member; This provides an alignment position in which the fold line of the cardboard sheet piece coincides with the free edge of the fixing plate. Then, the holding block of the sheet piece holding down actuator holds the aligned and positioned cardboard sheet pieces immovably on the fixing plate. Then, the bending tongue is driven in the vertical direction mainly by the movement of the first actuating part, and the tip of the tongue comes into contact with the upper surface of the sheet flap part and bends it 90 degrees downward from above. . Subsequently, the folding tongue is driven horizontally forward primarily by the movement of the second actuating part, so that the flap portion of the cardboard sheet is folded approximately 180 degrees around the free end edge of the fixed plate. The folding action by the folding tongues is carried out at once along the entire length of the folding line in short continuous motions while the cardboard sheet is held immovable by the restraining block. When the folding is completed in this way, the folding tongues are returned to their initial position outwardly and upwardly for the next stepwise operation cycle, and the hold-down blocks are also released and returned to their upper positions.

Other features and advantages of the invention will become apparent from the following description with reference to the accompanying drawings. Note that the drawings show one embodiment and do not limit the present invention.

〔Example〕

Fig. 1 shows an intermittent operating machine (not shown) for packing cigarettes into a small cigarette box with a rotating lid from a cardboard sheet piece 2, which has been cut out and formed with fold lines in advance.
1 shows a conveyor 1 used for delivering the goods to a person.

As shown in FIG.
It is divided into three parts 6, 7, and 8 by. 1st
Part 6 is further folded along another fold line to form the lid of the pivoted cigarette packet. In the first part 6, a tip flap 10 is formed by the fold line 9. This end flap 10 is bent and glued to the adjacent part 11 to reinforce the pivoting lid of the cigarette packet.

In FIG. 1, the conveyor 1 extends substantially horizontally on the base 3 between an inlet section 12 and an outlet section 13. In FIG. At the exit section 13, the cardboard sheet piece 2
is transferred onto the second conveyor 14, and then transferred onto the second conveyor 1
4 is an intermittent operating machine (not shown) for packing cigarettes into the aforementioned small cigarette box with a rotating lid.
is connected to.

A bending section 1 is located at a certain intermediate position along the conveyor 1.
5 is provided, and at this bending portion 15 the distal end flap 10 is bent below the adjacent portion 11 along the bending line 9. A gluing section 16 is provided at a position upstream of the folding section 15, in which gluing is applied to the lower surface of the tip flap 10. A pressing portion 17 is provided downstream of the folding portion 15 and is adapted to press the glued and bent end flap 10 against the back side of the adjacent portion 11 here.

The conveyor 1 includes a longitudinally extending support member 18 installed in a substantially horizontal position on the base 3, and this support member 18 has two conveyor drive shafts that are horizontal at both ends and perpendicular to the axis of the support member 18. 19 and 20. Two gears 21 are rotatably attached to both ends of the drive shaft 19, and each of these gears 21 is connected to an endless toothed conveyor belt 2 that extends longitudinally in parallel with the axis of the support member 18.
3 to a gear 22 attached to the drive shaft 20 on the opposite side.

One end of the conveyor drive shaft 20 rotatably extends through a sleeve 24 fixed to the base 3, and a gear 25 is attached to the end. The gear 25 meshes with a gear 26 mounted coaxially with the Maltese cross 27. The Maltese cloth 27 is attached to a rotating shaft 28 rotatably supported on the base 3. Drive shaft 3
A fan-shaped pin wheel 29 of a known type attached to 0 rotates the Maltese cross 27 intermittently or stepwise,
This allows the gear 2 to pass through the conveyor drive shaft 20.
2 and belt 23 are rotated in the same manner.

Two flat plates 31 and 32 are longitudinal support members 1
It is connected to both sides of 8 in a protruding manner. A central support beam 33 extending in the longitudinal direction is connected to the central region of the support member 18, and its upper surface is in the same plane as the flat upper surfaces of the two flat plates 31 and 32 described above.
These central support beams and the flat upper surfaces of the flat plates 31, 32 constitute a sliding support surface for the cardboard sheet piece 2.

Each cardboard sheet strip 2 connects two adjacent tie bars 3 of a plurality of tie bars 34 connected to a sun bear belt extending orthogonally across the central support beam 33.
It is arranged in a transfer compartment for sheet holding formed between the four. Both ends of the tie bar 34 are connected to the guide shoe 3.
5 to the belt 23. Each guide shoe 35 has a flat side surface that contacts the flat side surface of the central support beam 33, and a generally rectangular horizontal protrusion that slidably engages with a groove 36 formed in the longitudinal direction on the side surface of the central support beam 33. has. Belt 23 and tie bar 3
The lateral position of 4 is regulated by a guide shoe 35 and lateral protrusions 37 formed on both outer sides of the tie bar. As shown in FIG. 4, the lateral protrusion 37 is provided with teeth 38, and the teeth 38 extend within a longitudinal groove 39 formed on the upper surface of the flat plate 32.

The lateral position of the cardboard sheet pieces 2 in the transfer section formed between the tie bars 34 is controlled by guide ribs or sheet piece receiving and abutting members 40 connected to the upper surface of the flat plate 31 on the one hand, and by the flat plate 32 on the other hand.
A guide rib or sheet piece receiving abutment member 4 coupled to
1. Sheet piece receiving abutment member 40
extends along the entire length of the conveyor in the longitudinal direction, while the sheet piece receiving and abutting member 41 on the near side extends between the entrance section 12 and the folding section 15 of the conveyor 1. In the entrance portion 12, instead of the sheet piece receiving and abutting member 41, a regulating gate 42 is provided which is rotatably supported by a pin 43 supported by the flat plate 32. Further, the cardboard sheet piece 2 is a flat plate 31,
32 and the central support beam 33, a bracket 44 is connected to the sheet piece receiving and abutting member 41 and protrudes above the flat plate 32. and a vertical guide plate 45 extending between the folded portion 15 and the bent portion 15 .

As shown in FIGS. 3 to 6, the flat plate 32
has a concave portion on the side surface of the bent portion 15,
A fixing plate 46 for bending the cardboard sheet piece 2 having an upper surface coplanar with the upper surface of the flat plate 32 is fixedly disposed within this recessed portion. Fixed plate for bending 4
The free end edge 6 projects from the side surface of the flat plate 32 in parallel to the feeding direction of the cardboard sheet piece 2, extends straight, and constitutes a bar for folding the cardboard sheet piece 2.
The free end edge of this bending fixing plate 46 is arranged to coincide with the bending line 9 of the cardboard sheet piece 2 that has come to the bending part 15. That is, the sheet piece receiving and abutting member 40 disposed on the flat plate 31 at the back forming the sliding support surface member holds the flap 1 of the cardboard sheet piece 2.
The folding line 9 of the cardboard sheet piece 2 is aligned with the free end edge of the folding fixing plate 46 by receiving the edge of the portion 8 on the opposite side from the folding plate 46. A flat plate 3 that constitutes a sliding support surface member for the cardboard sheet piece 2
A sheet piece flap partial folding actuating device 47 installed on a fixed base in a lateral position of the cardboard sheet piece 2 cooperates with this folding fixing plate 46 to bend the flap 10 of the cardboard sheet piece 2 around the folding line 9. Bend it so that it faces the back side of the adjacent part 11.

The folding actuating device 47 for the sheet flap portion includes two cylindrical cams 48, 49 and a disc cam 50.
is keyed to a single vertical axis of rotation 5. The rotating shaft 51 is rotatably supported by the base 3 and connected to the drive shaft 30 via a transmission (not shown). As explained with reference to FIG. 1, the drive shaft 30 also drives the Maltese cross 27 that moves the conveyor belt 23 step by step. They are driven by an electric motor in conjunction with each other.

Further, a support member 52 is attached to the base 3, and this support member 52 has two pivot pins 53,
54 is mounted parallel to the direction in which the cardboard sheet pieces 2 are fed by the conveyor 1. One pivot pin 53
A first rocker arm 55 is pivotally mounted to the pivot pin 53 and has substantially parallel arms 56, 57 extending horizontally on either side of the pivot pin 53. The arm 56 is a cam follower (not shown) that is engaged with an annular cam groove 59 formed on the outer peripheral surface of the cylindrical cam 49.
It is equipped with a pin 58 for supporting. The other arm 57 is connected to the lower end of a substantially vertical connecting rod 61 by a hinge 60. These constitute the first operating section.

A third rocker arm 62 is pivotally connected to the other pivot pin 54 .
has two substantially perpendicular arms 63,64. These constitute the main part of the second operating section. one arm 6
3 includes a pin 65 for supporting a cam follower (not shown) that is engaged with an annular cam groove 66 formed on the outer peripheral surface of the cylindrical cam 48. The other arm 64 extends generally vertically upwardly and extends from the pivot pin 5.
a hinge 67 having an axis parallel to that of 3,54;
is connected to the intermediate position of the second rocker arm 68 by. The second rocker arm 68 extends substantially horizontally, and its rear end is connected to the upper end of the vertical connecting rod 61 by a hinge 69. The front end of the second rocker arm 68 is located above the arms 56, 63 and extends toward the bending fixing plate 46, and a bending tongue piece 71 is fixed to the tip thereof. The bending tongue 71 extends parallel to and substantially coaxially with the second rocker arm 68, and the connection position of the bending tongue 71 can be adjusted in the axial direction by an adjusting screw 70. A hanging projecting piece 72 is added to this bending tongue piece 71 and extends downwardly orthogonally to the axial direction of the bending tongue piece 71.

As described above, the folding actuating device 47 according to the embodiment of the present invention is constituted by a compound four-bar link movement mechanism having a rotating pair movable in one plane substantially perpendicular to the cardboard sheet feeding direction. . Thus, in this embodiment, the first actuating part is formed by the first rocker arm 55 and the second rocker arm 68 connected to the connecting rod 61, and the second actuating part is pivoted at the midpoint of the second rocker arm 68. It is formed from a third rocker arm 62.

The disc cam 50 includes an annular cam surface 73 facing the cylindrical cams 48 and 49, and a cam follower 74 rotatably attached to a pin 75 engages with this annular cam surface 73. The pin 75 is mounted at the lower end of a vertical actuating rod 76 which is arranged radially relative to the vertical axis of rotation 51 and slidably moves within a sleeve 78 secured to the base plate 3. Vertical operating rod 7
6 is biased by a spring 77 against the vertical movement that occurs as the disc cam 50 lifts. The upper end of the vertical actuating rod 76 is connected to the middle part of a horizontal plate 79, and this horizontal plate 79 extends from the middle connecting part to the flat plate 32.
It extends in the direction of and is arranged below the bending fixing plate 46. A guide rod 80 is provided on the lower surface of the horizontal plate 79 and extends downward parallel to the vertical operating rod 76.
A guide rod 80 is mounted and slides along a hole 81 formed in a fixed wall integral with the sleeve 78 to prevent the vertical actuating rod 76 from rotating within the sleeve 78. At the end of the horizontal plate 79 disposed facing the flat plate 32, an elevating and lowering press-fitting block 82 constituting a movable element of the pressing section 17 is provided. This crimping block 82 cooperates with a fixed crimping pedestal 83. The crimp pedestal 8 is preferably heated with an electric resistance heater (not shown). These crimping blocks 82 and crimping pedestals 83 cooperate with each other to sandwich the cardboard sheet piece 2, which has been folded nearly 180 degrees at the bending part 15, from above and below at a position downstream of the bending part 15, and then flap 1
0 to its adjacent portion 11.

The sheet piece holding down operating section is formed by a fourth rocker arm 88 which is actuated by the disc cam 50 via the horizontal plate 79 and a sheet piece holding block 90. Horizontal plate 79 on the opposite side away from flat plate 32
is connected to the lower end of a generally vertical tie rod 85 by a hinge 84 having a horizontal axis parallel to the pivot pins 53,54. A sleeve 87 is mounted on the upper end of the tie rod 85 so as to be slidable in the axial direction of the tie rod 85 against the action of a spring 86 disposed around the tie rod. The fourth rocker arm 88 is provided so as to be able to swing around a pivot pin 89 parallel to the pivot pins 53 and 54 at a position directly above the bending tongue piece 71 of the bending portion 15, and the sleeve 87 is attached to the fourth rocker arm 88. 88. The arrangement of the folding tongue 71 and the fourth rocker arm 88 is also shown in the folding actuator 47 of the folding section 15 in FIG. A sheet piece restraining block 90 is supported at the end of the fourth rocker arm 88 on the opposite side from the sleeve 87. The sheet piece holding block 90 is located directly above the bending fixing plate 46, and presses down the upper surface of the cardboard sheet piece 2 during the bending action of the tip flap 10 to align and position it on the bending fixing plate 46. This is to hold down the cardboard sheet piece 2 in an immovable state.

[Operation]

Regarding the action of the movable element of the bending part 15, the seventh
This will be explained with reference to the figures. Each diagram in FIG. 7 shows the moving element 2 during one step movement cycle of the conveyor
This explains the movements of numbers 3, 62, 88, and 55.

In FIG. 7, the horizontal axis is the operating cam 48, 4.
9 and 50, and one rotation of this rotation shaft 51 corresponds to one step movement cycle of the conveyor belt 23. The rotating shaft 51 and the fan-shaped pin wheel 29 of the Maltese cross 27 are both driven and rotated in parallel by the drive shaft 30. Regarding the vertical axis, V ₂₃ represents the step distance of the progressive feeding conveyor belt 23, θ ₆₂ represents the swing angle of the third rocker arm 62, and θ ₈₈ represents the swing angle of the fourth rocker arm 88. , θ ₅₅ indicates the swing angle of the first rocker arm 55.

One step operation cycle of the conveyor 1 is when the fan-shaped pin wheel 29 rotates the Maltese cross 27,
That is, it starts from the time when the belt 23 starts the step-by-step transport movement, and as a result, the folded cardboard sheet piece 2 is discharged toward the pressing part 17, and the next new cardboard sheet piece 2 is transferred to the folding part 15. It reaches the top of the bending fixing plate 46.

The conveyor belt 23 performs a step-by-step operation between 0 degrees and 240 degrees in a step-by-step operation cycle, and advances each cardboard sheet piece 2 one step at a time. conveyor belt 23
is stopped between 240 degrees and 360 degrees of one step movement cycle, and the cardboard sheet piece 2 that has reached the folding section 15 is folded during this period.

The fourth rocker arm 88 is for operating the sheet piece restraining block 90 to hold down the cardboard sheet piece 2 stopped at the folding portion 15, and the fourth rocker arm 88 is for suppressing the cardboard sheet piece 2 stopped at the folding portion 15. The sheet piece holding block 90 attached to the tip is moved up and down. This fourth rocker arm 88
It starts operating at around 190 degrees, and at 260 degrees slightly after the belt 23 stops, the sheet piece holding block 9
0 is completed, and the cardboard sheet piece 2 is held down prior to folding. Then, just before the end of the stop period of the belt 23, at a point of 340 degrees, the belt 23 is activated again and becomes separated from the cardboard sheet piece 2.

The third rocker arm 62 consists of a horizontal arm 63 and a vertical arm 64 that are driven by the upper cylindrical cam 48. Basically, the vertical arm 64 moves the bending tongue piece 71 to the bending fixing plate by the swinging of the horizontal arm 63 and the vertical arm 64. 46 and horizontally lateral inward and outward movement relative to the entire device. This will be clear from Figures 3 to 6. In addition, the first Rotsuker arm 5
5 consists of a horizontal arm 56 that follows the lower cylindrical cam 49 and an arm 57 that extends horizontally in a substantially straight line from the lower cylindrical cam 49. Basically, the right horizontal arm 5
7 rotates upward, the second rocker arm 68 is rotated via the connecting rod 61, and the bending tongue piece 71 at the tip of the second rocker arm 68 is lowered, and when the horizontal arm 57 rotates downward, the bending tongue piece 71 is lowered. This is to raise the tongue piece 71. These two rotational movement mechanisms have a correlative interlocking relationship constituting an articulated compound four-bar linkage movement mechanism.

Referring to FIG. 7, the beginning of the operating cycle, ie, the point at which the belt 23 begins its stepping motion, is 0.
At the same time, the third and first rocker arms 62
and 55 are both located in the swinging device in the counterclockwise direction (corresponding to the downwardly inclined line portion in the left direction), and the bending tongue piece 71 is at this time, for example, as shown in FIG. It is in a position where it is trying to escape from below. At around 40 degrees, both rocker arms 62 and 55 are rotated clockwise (corresponding to the rightward downward sloping line portion). Then,
The third rocker arm 62 moves the bending tongue 71 outward to the right, and the first rocker arm 55 moves the bending tongue 71 upward, so that the bending tongue 71 is moved as shown in FIG. The position is outside of and above the fixation plate 46 as shown. At this time, the hanging protruding piece 72 of the bending tongue piece 71 is positioned outside the end flap 10 of the cardboard sheet piece 2. The position of the folding tongue 71 shown in FIG. 3 is achieved approximately halfway through the stepwise movement of the belt 23, i.e. the clockwise movement of the third rocker arm 62 has ended at 120 degrees;
The clockwise movement of the first rocker arm 55 is
Finishes at 160 degrees.

Next, in the latter half of the stepping motion period of the belt 23,
After the 160 degree position, the lower actuating cylindrical cam 4
9 maintains the first rocker arm 55 at a constant angular position, the upper actuating cylindrical cam 48 rotates the third rocker arm 62 in the counterclockwise direction, thereby causing the bending tongue 71 to move toward the fixed plate 46. It begins to move forward in a straight line, and the hanging protruding piece 72 engages with the outer end face of the tip flap 10 of the cardboard sheet piece 2 and pushes the outer end face, and the opposite free end of the cardboard sheet piece 2 is placed in the sheet piece receiving abutment. The cardboard sheet pieces 2 are brought into full contact with the mating member 40 to ensure alignment and positioning of the cardboard sheet pieces 2 on the conveyor 1. The movement of the third rocker arm 62 starts at 240 degrees while the cardboard sheet piece 2 is still moving, but ends at or slightly after the belt 23 stops. Immediately after this, the cardboard sheet piece 2 is pressed against the sheet piece receiving and abutting member 40. This lateral positioning allows the bending line 9 of the cardboard sheet piece 2 to be aligned with the fixing plate 46.
perfectly coincides with the free edge of Simultaneously with the operation of the third rocker arm 62, the fourth rocker arm 88 of the sheet piece holding block 90 described above is operated. That is, the actuating disc cam 50 causes an upward movement in the cam follower 74, which causes the vertical actuating rod 76 to move upwardly against the spring 77.
This upward movement is transmitted to the tip of the fourth rocker arm 88 via the horizontal plate 79 and tie rod 85.
The other end of the rocker arm 88 moves downward, and the sheet piece holding block 90 presses the cardboard sheet piece 2 against the fixed plate 46. At this time, the pressing force is transmitted to the sleeve 87 at the upper end of the vertical operating rod 76 via the spring 86, so that the sheet piece holding block 90 elastically holds down the cardboard sheet piece 2.

In this way, immediately after the conveyor belt 23 stops, the cardboard sheet piece 2 is completely positioned laterally at the folding portion 15 by the hanging protruding piece 72, and at this position is held in an immovable state by the sheet piece holding block 90. It will be done. Immediately after that, at a point of 260 degrees, the first rocker arm 55 is rotated counterclockwise, and as a result, the tip of the bending tongue piece 71 comes into contact with the upper surface of the fixed plate 46, as shown in FIG. Then, the cardboard sheet piece 2 is moved downward, and the end flap 10 of the cardboard sheet piece 2 is bent downward at a right angle. At a slightly later time point of 270 degrees, the third rocker arm 62 is rotated counterclockwise again, as shown in FIG.
The free tip of the bending tongue 71 moves forward to the left along the lower surface of the fixing plate 46, and the tip flap 10 is bent approximately 180 degrees to near the bottom of the fixing plate 46 to complete the bending operation. Thereafter, at the 340 degree point, the sheet piece holding block 90 is lifted and returned to the open position, as shown in FIG. Then, at the 360 degree point, the belt 23 begins its step motion, and the folding tongue 71 is returned to the position shown in FIG. 3 during the next cycle of step motion of the belt 23.

It should be noted that unlike conventional conveyors,
The leading flap 10 of the cardboard sheet piece 2 is not folded during its feeding movement, as is the case with conventional fixed helical folding members, but in the present invention the cardboard sheet piece 2 is instead folded. is bent approximately 180° around the fixing plate 46 while the flap 10 is at rest, thereby allowing the flap 10 to be bent exactly along its bending line 9. Ta.

Within the scope of the invention, various modifications can be made to the flap folding device described above without departing from the invention. For example, the vertical and lateral movement of the folding tongues 71 necessary to fold the tip flap 10 below the fixing plate 46 can be achieved by means different from those described above. For example, each of the first and second Rocker arms 5
5, 68, the connecting rod 61, and the four-bar link movement mechanism formed by the hinge frame consisting of the support member 52 and the vertical arm 64 of the third rocker arm 62. Other types of means for directional movement may be employed. For example, the rocker arm 6 is rotatable around an axis parallel to the feeding direction of the cardboard sheet piece 2.
8 is supported on a sliding member that can move forward and backward in the horizontal direction with respect to the fixed plate 46, or a sliding member that can move vertically is attached to a sliding member that can move forward and backward in the horizontal direction. It could also be configured.

〔Effect of the invention〕

As explained above, according to the present invention, the cardboard sheet pieces are transported by the stepwise feeding device, and in the folding device provided at a predetermined stopping position, the cardboard sheet pieces are engaged with the sheet piece receiving and colliding means. are aligned and positioned with respect to the bending fixing plate, fixed immovably from above by a sheet piece holding block, and by a bending tongue piece disposed almost facing the bending fixing plate. Since it can be bent, accurate bending along the bending line is possible, and defects such as wrinkles during bending can be eliminated. The folding tongue can bend the flap of the cardboard sheet piece at a right angle, and then further bend it approximately 180 degrees toward the bottom surface of the cardboard sheet body, and this bending operation is a stepwise feeding operation. This can be achieved within a very short downtime between step transfer periods in conjunction with this, thereby increasing productivity.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conveyor equipped with a folding device according to the present invention viewed from above, FIG. 2 is a plan view of cardboard sheet pieces being fed to a packaging machine by the conveyor shown in FIG. 1, and FIG. 4, 5 and 6 are enlarged partial cross-sectional views showing four different instantaneous operating states of the folding device of FIG. 1, simplified by removing some parts, and FIG. FIG. 7 is an operation progress diagram illustrating the operation of the movable elements of the folding device shown in FIGS. 3 to 6; 1... Conveyor, 2... Cardboard sheet piece, 9...
Bending line, 10... flap, 15... bending part, 17... pressing part, 23... conveyor belt,
27...Malta cross (step feeder), 31,
32...Flat plate, 33...Central support beam, 40...Sheet piece receiving and abutting member, 46...Fixing plate, 48,4
9, 50... Operating cam, 55, 62, 68, 88
...Rotzker arm, 71 ...Bending tongue piece, 9
0... Sheet piece holding block.

Claims (1)

[Scope of Claims] 1. Flap-folding of cardboard sheet pieces installed on a conveyor device for delivering pre-cut and formed cardboard sheet pieces to an intermittent operating machine for packing cigarettes into cigarette packets with rotating lids. The bending device includes a sliding support surface member 3 for the cardboard sheet pieces installed on a fixed base extending in the longitudinal direction of the conveyor.
1, 32, 33, and step feed devices 23, 2 for advancing the cardboard sheet piece by step motion to a predetermined position in a fixed feed direction along the sliding support surface member.
7, 29, and a sheet piece flap portion 10 extending outward from a folding line parallel to the transport direction of the surface of the cardboard sheet piece in order to fold the sheet piece flap portion, The bending device is provided with a fixed plate 46 constituting a bending bar whose free end edge extends parallel to the feeding direction from the sliding support surface member at a predetermined position along the feeding path of the sliding support surface member. A sheet piece receiving and abutting member 40 for aligning the bending line on the surface of the sheet piece to a proper position corresponding to the free extending edge of the fixing plate 46.
is installed on the sliding support surface member so as to cooperate with the opposite edge of the sheet flap portion, and is further installed on a fixed base at a lateral position of the sliding support surface member. The partial bending operation means includes a bending tongue piece 71 that faces the free overhanging edge of the fixed plate 46 and extends in a direction perpendicular to the transfer direction, and the tip edge of the tongue piece 71 faces the free overhanging edge. A first actuating part that is formed substantially parallel and moves vertically with respect to the fixed plate 46 by a driving action parallel to and interlocked with the stepwise feeding device 29 within a plane orthogonal to the transfer direction, and its horizontal front and back. The position of the bending tongue piece 71 is controlled by the combined actuation movement provided by the second actuating portion that moves in the direction, and the sheet piece holding operation that holds down the cardboard sheet piece on the fixing plate 46. A section is also installed in parallel with and interlocked with the stepwise feeding device 29, and through these three actuating sections, the movement of the second actuating section is performed mainly during the stepping period of one working cycle of the stepwise feeding. The tip of the folding tongue 71 first contacts and advances the free edge of the sheet flap portion to complete the cardboard sheet alignment positioning operation, and then at the beginning of the resulting stop period of the operating cycle The sheet piece restraining actuating section is activated to immovably press the aligned and positioned cardboard sheet pieces onto the fixing plate 46, and then, mainly due to the movement of the first actuating section, the cardboard sheet pieces protrude from the free end edge of the fixing plate. While the tip of the bending tongue piece 71 is brought into contact with the upper surface of the flap portion of the sheet piece, it is pressed down 90 degrees from above, and then the fixing plate 46 is moved mainly by the movement of the second actuating part.
The flap portion 10 of the sheet piece is folded approximately 180 degrees around the free end edge of the sheet, and finally the first actuating portion and the second actuating portion are returned to their initial positions upward and outward, and at the same time the sheet piece is folded. A flap folding device for a piece of cardboard sheet, in which a holding actuator is operated from a holding position to an open position. 2. A hanging projecting piece 72 is added to the bending tongue piece 71 and hangs downward with respect to the axial direction of the tongue piece, and when the second actuating part moves horizontally forward, the fixing plate 4
6, a hanging projecting piece 72 is pressed against the free end face of the sheet flap portion arriving at the sheet piece flap part, and the cardboard sheet piece is pushed into the sheet piece receiving and abutting member 40 on the sliding support surface member to align and position it. A flap folding device for cardboard sheet pieces according to item 1. 3. The first and second actuating parts are constituted by a four-bar link movement mechanism having a rotating pair part movable in a plane substantially perpendicular to the sheet feeding direction,
The first actuating section is formed of a first rocker arm 55 and a second rocker arm 68, each of which is connected to a substantially vertical connecting rod 61 by a rotating pair, and has a bending tongue 71 at the free end of the second rocker arm 68. is attached, and the second actuating portion is formed from a right-angled third rocker arm 62, which is pivotally connected to the midpoint of the second rocker arm 68, and the first and third rocker arms 55, 62 are fixed. The first and third rocker arms 5 are rotatably supported on a support member 52 so as to be rotatable about an immovable axis parallel to the feeding direction.
The base end portions of 5 and 62 are connected to the first and second actuating cams 4.
3. A flap-folding device for cardboard sheet pieces as claimed in claim 1 or 2, wherein the flap-folding device is cooperatingly connected with 8 and 49. 4 The two first and second operating cams 48, 49
4. A flap folding device for cardboard sheets according to claim 3, wherein the flap folding device is keyed to a rotary shaft driven in parallel with the step feeding devices 29 and 23. 5. A sheet piece restraining actuating section is provided above the sheet piece bending fixing plate 46 and is comprised of a restraining block 90 that restrains the cardboard sheet piece, and the restraining block 90 is attached to the free end of the fourth rocker arm 88 and A restraining block drive unit is installed which is driven in parallel with the stepwise feeding devices 29, 23, thereby restraining the cardboard sheet pieces aligned and positioned on the fixing plate 46. 2. A flap folding device for cardboard sheet pieces according to claim 1. 6. The drive unit of the sheet piece holding block 90 is attached to the free end of the fourth rocker arm 88, the other end of which is connected to at least one substantially vertically extending actuating rod 76 and the actuating rod 76. The cardboard according to claim 5, wherein the rod 76 is capable of vertical reciprocating movement in cooperation with a third operating cam 50 which is keyed onto the rotation shafts of the first and second operating cams. Flap folding device for sheet pieces.