JPS6258963B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a bag for storing and packaging a load, for example, four toilet paper sheets in two, three, four, etc. layers, into a bucket through which the load is pushed. This invention relates to an automatic bag mounting device for a bag filling and packaging machine that spreads and covers bags.

Such a mounting device is known from Japanese Patent Publication No. 55-20939. This includes first and second moving members that each have a suction part and are reciprocated, and the first
The movable member is moved back from the second movable member so that the top surface of the top bag of the bags stacked on the bag storage section is
The suction part of the movable member sucks the bag, then the first movable member moves forward, and during the forward movement, the bottom surface of the bag is suctioned by the suction part of the second movable member, and from there the second movable member is sucked by the first movable member. While moving the bag forward at the same time, the cam swings both moving members to open the bag and place it over the bag. When the bag is attached to the bag, both moving members move back together halfway, and even though the second moving member stops there, the first moving member moves back further and the second moving member moves back.
The moving member waits until the first moving member adsorbs the opening of the next bag and moves halfway forward. In this way, in the conventional device, the reciprocating strokes of the first moving member and the second moving member are different, so it is necessary to reciprocate both moving members separately, and synchronization is required during the forward movement of the first moving member. A timing device for starting the forward movement of the second moving member and a cam for causing both moving members to open the bag are also required, making the device complicated. Furthermore, while the first moving member adsorbs the top surface of the bag and moves forward to the point where the second moving member is waiting, the bottom surface of the bag hangs down, causing problems such as being caught in the machine and being damaged.

Accordingly, the present invention provides a bucket bag whose front end is hinged to the opposite edge of the cargo passage opening, the free end facing rearward and facing each other, and through which the cargo stored in the bag passes backward from the front end; A bag is provided at a distance behind the free end of the bucket, and a bag is made by cutting a long tube to a predetermined length, and the bag is fed to a predetermined position behind the free end of the bucket with the mouth of the bag facing forward. a bag feeding device, a slider that is reciprocated back and forth between the bucket and the bag feeding device, a suction portion facing opposite to each other at a front end, and a rear end pivotally connected to the slider; A pair of upper and lower arms that position the suction section at the front end over the free end of the bucket when moving forward, and above the mouth of the bag supplied by the bag feeding device when moving backward, and a pair of upper and lower arms that point backward from one of the arms. When the upper and lower arms move forward and backward with the slider, the arm extends to the rear end and has a cam follower attached to it, and when the upper and lower arms move forward and backward, the cam follower rolls, and when moving forward, the suction parts at the front ends of both arms are separated and the bag a cam having a cam surface that spreads the mouth of the bag and covers it over the free end of the bag, and when retracting, brings the suction part closer to pinch the mouth of the next bag supplied by the bag feeding device from above and below; Connect the arms of
A rod for interlocking both arms, and a rod provided between the two arms or between each arm and the slider to urge the suction portions at the front ends of both arms to sandwich the mouth of the bag, and the cam follower. A spring that presses against the cam surface of the cam, a switching cam that can be horizontally connected to or separated from the rear of the cam surface, and a sensor that detects the presence or absence of a load on the conveyance path leading to the bucket. , is activated by the sensor, and when there is a load on the conveyance path, the switching cam is moved away from the rear of the cam surface, and the slider retreats to cause the cam follower to reach the rear end of the cam surface, and the pair of arms are moved. The mouth of the bag is held between the suction parts at the front end, and when there is no load, a switching cam is connected to the rear of the cam surface and the cam follower is guided onto the switching cam, so that the suction parts at the front ends of the pair of arms close the bag. and an actuator that prevents the user from pinching the mouth of the user.

As a result, the pair of upper and lower arms, each having a suction section facing each other at the front end, reciprocates as a unit as a result of the back and forth reciprocation of the slider to which each rear end is pivotally attached.
They are connected by a rod and move the suction parts at the front ends closer to each other to grip the opening of the bag, or move them apart to expand the opening of the bag.

While the sensor detects that there is a load on the conveyance path,
The actuator separates the switching cam from the rear of the cam face. As a result, the cam follower provided on one of the pair of upper and lower arms that retreats with the slider can roll on the cam surface of the cam to the rear end, and the pair of arms can move the opening of the bag up and down by the bias of the spring. Then, pinch it with the suction part. Next, by moving forward with the slider, the cam follower moves backward on the cam surface of the cam, and the suction parts at the front ends of the pair of arms move away from each other, expanding the mouth of the bag in the vertical direction, allowing the load to pass inside from front to back. Place it on the back of the bucket, then step back again and repeat the process.

Also, when the sensor detects that there is no load on the conveyance path, the actuator connects the switching cam to the rear of the cam surface of the cam. As a result, the cam follower transfers from the cam surface of the cam to the switching cam during the retreat of the slider and the pair of arms and moves backward, and because it cannot reach the rear end of the cam surface, the suction part at the front end of the pair of arms is half open. I am in a situation where I am unable to open the bag from above and below. Therefore, the next time the slider moves forward, the paired arms move forward together without sandwiching the bag, and do not cover the bucket with the bag.

Hereinafter, the present invention will be explained with reference to an illustrated embodiment.

Reference numeral 1 denotes a turret disk which is equipped with, for example, four buckets 2 at equal intervals in the circumferential direction, and when the number of buckets is n, the turrets are intermittently controlled clockwise as shown by the arrows in FIG. The opening of the bag A is placed over the bucket 2 in the first position I, and the pusher 3 is placed in the bag attached to the bucket 2 in the third position. This pushes the load through the bucket, which pushes the bottom of the bag and removes the bag from the bucket.

The bucket 2 consists of a pair of U-shaped grooved plates 2a, 2a hinged to opposite edges of the load passage port of the turret plate 1, and both plates are linked so as to interlock. Connected by 2b, turret board 1
When the bag is installed in the first position by the piston cylinder 2c attached to the piston cylinder 2c, the free ends are brought close to each other and narrowed, and when the installation is completed, the free ends are separated from each other and opened, and the bag is inserted into the bag in the third position. Until the load is pushed in, the opening of the bag is held by friction from the inside, but its structure is well known (Japanese Patent Publication No. 57-37485) and will therefore be omitted here.

A bag feeding device 5 is attached to the machine body 4 that supports the turret board 1. The bag feeding device pulls out a long synthetic resin tube A wound on a reel 6 to be made into a bag to a predetermined length by a pair of upper and lower pinch rollers 7.
When the drawing is finished, the heated cutter 8 operates just before the pinch roller to cut the tube in the width direction and heat seal the previous cut to form the bottom of the bag.
This is a well-known device that uses the last cut to open the next bag, and in front of the cutter 8 are an endless belt conveyor 9 that circulates in synchronization with the pinch roller 7 and at the same speed as the circumferential speed of the pinch roller. In front of is the supply plate 1
0, the belt conveyor 9 carries the tube A pulled out by the pinch roller 7 on its upper surface and moves it forward, and stops at the same time as the pinch roller stops, and at this time the front end of the tube reaches the front end of the supply plate 10.

The pinch roller, cutter, conveyor, and supply plate are located behind the bucket at the first position,
The mouth of the bag cut from the tube with the heated cutter 8 is always located at a predetermined position on the supply plate 10 rearwardly away from the free end of the bag bag in the first position.

As shown in Fig. 4, the bag or tube has folded gusset pieces 11, 11 on both sides, and specific marks 12 are printed on the surface at regular intervals depending on the height of the load to be stored. , the bag feeding device has reel 6.
A photoelectric device 13 for detecting the mark 12 is provided on the path of the tube A toward the pinch roller 7. When the bag feeding device receives a signal to start operation, it drives the pinch roller 7 and the conveyor 9, and the photoelectric device 1
3 detects the next mark 12, the pinch roller
The conveyor stops.

The intervals between the marks 12 are, for example, 4 in one row in the bag.
There are different tubes for bags that hold three levels of individual toilet paper, and tubes for bags that hold four or five levels. Accordingly, it is necessary to change the length of the upper surface of the belt conveyor 9 and the positions of the cutter 9 and the photoelectric device 13, so in this embodiment, the bag feeding device 5 is mounted on the bed of the machine by means of wheels 5'. Screwing a screw shaft 5a placed on the front-rear rail 4' and rotatably mounted on the bed into the bag feeding device,
The bag feeding device can be moved back and forth by the rotation of the screw shaft, and the belt conveyor 9 is movable back and forth and forms a fold 9' by a tension roller 9a pulled forward by a spring 9a'. When the tube reel of the three-tier bag is removed and the tube reel of the four-tier bag is set in the bag feeding device, the bag feeding device is moved backward, thereby setting the cutter to the four-tier position, and at the same time By extending the conveyor backwards against the tension roller 9a by the rear roller 9b, which covers the rear end of the belt conveyor 9 that moves together, and shortening the amount of folding 9', the length of the upper surface of the conveyor is reduced. Extend it backwards to make it four-tiered. On the other hand, to change from four tiers to three tiers, move the bag feeding device forward, move the cutter and rear roller forward, increase the amount of turnback 9' on the conveyor, and adjust the length of the top surface of the conveyor and the position of the cutter. Adjust for three steps.

The photoelectric device 13 is mounted movably on a guide rod 13a and a screw rod 13b provided on the bag feeding device in parallel to the path of the tube, and is used for three-stage operation by turning the screw rod 13b forward and backward by hand. mark and the mark for four stages can be aligned to the detection position.

As shown in FIG. 1, the rear roller 9b of the conveyor mentioned above is installed between the movable side walls integral with the bag feeding device 5,
The tension roller 9a and the other rollers are installed between the fixed side wall that is integral with the frame 4, and only the tension roller has its shaft end supported in a long hole 9d in the longitudinal direction provided in the fixed side wall, so that the upper surface length of the conveyor When shortened, the front part of the movable side wall overlaps the outer or inner surface of the rear part of the fixed side wall, and the rear roller 9b of the conveyor and the lower roller of the pinch roller 7 may be rotationally driven by an endless chain or the like.

The machine body 4 has a bag placed between the bucket at the first position on the turret board 1 and the supply plate 10 of the bag supply device 5, and the front end of the bag on the supply plate 10 of the bag supply device is sandwiched and sucked. a pair of upper and lower arms 14a for opening and covering the bag with the bag stopped in position;
14b, a slider 15 that pivots the rear ends of both arms and reciprocates in the front-rear direction, and a cam that separates the suction parts at the front ends of both arms when both arms 14a and 14b move forward together with the slider. 16, and a guide 17 for guiding the reciprocating movement of the slider.

Both arms have suction parts 14a', 1 opposite to each other at their front ends.
4b', and each suction section is connected to a negative pressure source by a flexible hose or the like through a hollow part of the arm and a rotary joint whose rear end is pivotally connected to the slider. The lower arm 14b has an integral arm 18 extending rearward, and has a cam surface 1 of the cam 16 at its rear end.
A cam follower 18' such as a roller that rolls on the arm 6' is attached, and a rod 19 connects the upper arm 14a and each middle part of the arm 18.

The cam surface 16' is flat and high in the upper part 16a of the first half.
and the backward downward slope section 16b that follows.
The lower end of the inclined portion 16b has a flat, low and short lower step portion 16c that extends rearward. and,
Above the lower part 16c, there is a swing cam 20 at a distance that allows the cam follower 18' to pass therethrough, and behind the swing cam 20 there is a switching cam 22 which is swing-operated by an actuator 21 such as a piston cylinder.

The swing cam 20 is swingable about a shaft 20' as a fulcrum, and has a slope at its front end that contacts the lower part of the slope 16b, and when it contacts the slope 16b with this slope, its upper surface is approximately Become horizontal.

The switching cam 22 can take a horizontal position and an inclined position with its front end raised by the actuation of the actuator 21. In the horizontal position, the front end is connected to the rear end of the swinging cam, and its upper surface is connected to the swinging cam's rear end. It is continuous with the upper surface (Fig. 7). Also, in the tilted position, the front end rises and separates from the rear end of the swing cam, and the cam follower 1 mentioned above
8' is the lower part 16c of the cam surface from the rear end of the swinging cam.
Allow it to fall upwards (Figure 6).

The actuator 21 operates the switching cam 22 to a horizontal position when the load being pushed into the bag through the bucket of the turret plate is interrupted. In this embodiment, a bag is attached to a bucket at a first position, and when the bucket is rotated to a second position, further rotated to a third position, and stopped, a load is pushed into the bag. For this reason, the bucket at the first position passes through the second position and then reaches the third position.
A sensor 24, such as a phototube, is provided on the conveyance path 23 to detect whether or not there is a load to be pushed into the bag through the bucket on the load conveyance path 23 when the bucket is rotated to the specified position. The sensor 24 sends a signal to a solenoid valve or the like that operates the actuator 21, and operates the actuator to activate the switching cam 22.
to a horizontal position.

In this embodiment, the drive device 25 for reciprocating the slider 15 includes a crank disk 25a to which the rotation of the drive motor is transmitted at a reduced speed, and its lower end is pivotally connected to the fuselage, and the drive device 25 is swung back and forth by the crank disk. It consists of a rocking arm 25b, and the slider 15 is pivotally connected to a long hole at the upper end of the rocking arm 25b.
The actuator is not limited to this, and may be a chain like the conventional example described above or a piston-cylinder type fluid pressure actuator.

If there is a load at the position on the conveyance path 23 detected by the sensor 24, the turning cam 22 is in an inclined position, and the slider 15 is stopped at the most retracted position while the turret plate 1 is rotating. The cam follower 18' passes the rear end of the swinging cam 20 and falls onto the lower part 16c, and is located on the lower part (FIG. 6).
Suction parts 14a', 1 at the front ends of arms 14a, 14b
4b' is sandwiched and adsorbed at the front end of the bag of the supply plate 10, that is, within the notch 10' provided by opening the opening of the bag to the front end of the supply plate. In addition, both arms 14a, 14b
At the same time, the suction parts 14a' and 14b' at the front end of the bag are urged so as to sandwich the mouth of the bag.
A spring 26 is provided to press against the cam surface 16' of 6. The spring 26 may be a traction spring having each end attached to an arm as shown in the figure, but it may also be a traction spring having each end attached to each arm and slider and pulling each arm individually.

When the rotation of the turret plate stops, the drive device 25
moves the slider forward, and the cam follower 18 moves from the lower part 16c of the cam 16 to the inclined part 16b.
Climb up and move forward by pushing the swinging cam 20 upward as shown by the broken line in FIG. As a result, arms 14a, 14
The front end of the bag opens apart against the bias of the spring 26, and the suction parts 14a' and 14b' expand the opening of the suctioned bag in the vertical direction by extending the gusset pieces 11 and 11. When the cam follower 18' climbs up the slope 16b, the mouth of the bag opens to the maximum, and after that, the cam follower advances on the high step 16a, and the arms 14a, 1
The suction part 4b reaches above and below the free end of the bucket bag in the first position, and the bag is attached by putting the opening of the bag over the bucket bag 2. In this way, when the slider 15 reaches the most advanced position, it starts to move backward, but just before that, the bucket 2, which had been shrunk by bringing its free end closer together,
If the free end of the bag is opened with a piston cylinder or the like, and the bag is held from the inside by the bucket, the suction parts 14a' and 14b' will keep sucking the bag from above and below, and even if the bag moves backward along with the slider, the bag will not leave the bucket. It doesn't come off. If necessary, in addition to opening the free end of the bucket, the valves in the middle of the intake pipes connected to each suction section 14a', 14b' are closed only while the cam follower is retreating above the high step 16a, and the suction operation is performed. may be interrupted.

When the slider starts to move backward, the bag feeding device 5 receives a signal to start operation, drives the pinch roller 7 and the conveyor 9, pulls out a predetermined amount of the tube A, and supplies the front end of the tube, that is, the opening of the next bag. Arriving on the front end of the board, the cutter 8 forms the bottom of the next bag and the mouth of the next bag, and waits for the next signal.

Note that a nozzle 27 is cut out on the bottom surface of the supply plate 10 to inject air toward the bucket at the first position.
0', and when the slide retreats, air is injected from the nozzle 27, and the remaining part of the bag attached to the bag, which is protruding from the bag, is turned over and pushed into the bag, from the first position to the second position. During the rotation to the third position, the remaining part of the bag hangs down from the free end of the bucket and gets caught on something, causing it to tear. Preferably, the bag becomes a cylinder so that the air inside the bag is compressed by the load to the bottom of the bag, thereby preventing the load from being stored in the bag in a predetermined condition.

Also, while the slider is moving back and forth, the load is pushed into the bag through the bucket at the third position, and the loaded bag is removed from the bucket and transferred to, for example, the roller conveyor 29.
It comes out on top, and then the open bag can be closed.

As the slider moves backward, the cam follower 18' moves backward along the high step 16a and then down the slope 16c, whereby the front ends of the arms 14a and 14b gradually approach and close. Since the swinging cam 20 is connected below this inclined portion 16c, the cam follower 1
8' moves backward on the substantially horizontal upper surface of the swing cam 20 from the middle of the inclined portion 16c. Therefore, arm 14
After the front ends of a and 14b are closed to a certain extent, they remain as they are, and the slider retreats the most and the cam follower 18' falls from the rear end of the swing cam 20 onto the lower part 16c of the cam 16. Stops (6th
), the suction section 14 at the front end of the arms 14a, 14b
a' and 14b' snap the opening of the bag from above and below within the notch 10' of the supply plate 10 and attract it. Then, the turret disk starts rotating by 1/n, and the slider 15 waits for the rotation of the turret disk to stop, then starts moving forward, and repeats the above-mentioned process.

When the sensor 24 detects that the load has discontinued on the conveyance path 23, the actuator 21 is actuated to bring the switching cam 22 into a horizontal position and connect the tip of the switching cam 22 to the rear end of the swinging cam 20. Figure 7). Therefore, when the slider 15 moves backward, the cam follower 18' moves backward from the rear end of the swing cam 20 on the turning cam 22 and cannot fall onto the lower step 16c of the cam 16, so that the suction parts 14a' at the front ends of both arms 14b' cannot be sucked by pinching the opening of the bag. Next, when the slider moves forward, the cam follower is a switching cam,
It advances on the swinging cam and climbs the slope part 16b from the middle, and both suction parts move forward without taking the bag with them, so that the bag is not attached to the bucket at the first position. Of course, at this time, the sensor 24 also sends a signal to the bag feeding device 5, and the sensor 24 either does not operate the bag feeding device even if it receives an operation start signal emitted when the slider retreats, or the sensor 24 sends a signal to the bag feeding device 5 when the slider moves back. Do not issue a start signal to the device.

In this way, while the sensor 24 does not detect a load on the conveyance path, the turret plate only rotates intermittently at 1/n rotation, the slider and upper and lower arms reciprocate, and the bag feeding device stops operating. I remain quiet, but
When the sensor detects a load on the conveyance path 23, the actuator 21 is actuated to place the switching cam 22 in an inclined position, and the bag feeding device is also actuated by the signal received when the slider retreats, so the bag is placed in the bucket at the first position again. can be installed.

Suction parts 14a', 14 provided at the front ends of both arms
It is preferable that b' is always placed with its suction surfaces facing each other. For this reason, each suction part is rotatably attached to the front end of each arm, and each suction part and the slider 15 are connected by connecting rods 28a, 28b, so that each arm swings during the reciprocating movement of the slider. The suction surfaces of each suction part are kept horizontal and facing each other by a continuous rod.

The swing cam 20 is provided in this embodiment because the cam follower 18' is moved backward on the swing cam at the end of the slider's retreat, and when the cam follower falls from the rear end of the swing cam onto the lower part 16c. This is to allow both suction parts 14a' and 14b' at the front ends of the upper and lower arms to snap the opening of the bag from above and below within the notch 10' of the supply plate. However, if this is not necessary, the swing cam 20 may be omitted, and the turning cam 22 may be extended forward and connected to the lower part of the inclined portion 16c when the turning cam 22 is in a horizontal position. As a result, when the sensor 24 detects that there is a load on the conveyance path 23,
The switching cam 22 is placed in an inclined position by the actuator 21, and as the slider retreats, the cam follower 18'
goes down the inclined part 16c of the cam and reaches above the lower part 16c, and the suction parts 14a', 14 at the front ends of both arms
b' gradually approach each other and pinch the mouth of the bag from above and below within the cutout of the supply plate, and then when the slider moves forward, it climbs up the slope 16b from the lower step 16c. or,
When the load breaks on the conveyance path, the sensor detects this and operates the actuator to bring the switching cam 22 into a horizontal position and connect its front end to the lower part of the inclined portion 16b. Therefore, as the slider retreats, the cam follower 18' moves halfway down the inclined portion 16c.
After that, the slider moves backward on a nearly horizontal turning cam, so the suction parts 14a' and 14b' at the front ends of both arms are separated and cannot grip the opening of the bag, and the next time the slider moves forward, the cam follower moves on the switching cam and climbs the slope part 16b from the middle, both suction parts move forward without taking the bag with them, and the bag does not cover the bucket at the first position.

In this way, according to the present invention, the upper and lower pairs of arms are moved forward and backward together by the slider, and when there is a load on the conveyance path, the suction parts 14a', which are opposite to each other at the front ends of both arms,
Use 14b' to pinch the opening of the bag, widen the opening, and place the bag over the bucket.When the load is interrupted, do not pinch the opening of the bag with the suction part, thereby avoiding wasting the bag over the bucket. It can be prevented.

The upper and lower arms are connected by rods and work together, so only one cam is needed to grasp the opening of the bag and suction it, or to spread the opening of the suctioned bag and cover it with the bucket. In combination, the present invention has excellent features in that the structure can be extremely simplified and a failure-free device can be provided.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a schematic side view of the whole, Fig. 2 is a plan view of the same as above, Fig. 3 is a front view of a turret board, and Fig. 4 is a diagram for making a bag. FIG. 5 is an enlarged side view of the bag feeding device; FIG. 6 is an explanatory diagram of the operation when the switching cam is in an inclined position and a bag is being loaded; FIG. The figure is an explanatory diagram of the operation when the turning cam is in a horizontal position and no bag is attached.
2 is a bucket, 5 is a bag feeding device, 14a, 14b are upper and lower arms, 14a', 14b' are suction parts at the front end of each arm, 15 is a slider, 16 is a cam, 16'
is the cam surface, 18 is the arm, 18' is the cam follower, 1
9 is a rod, 21 is an actuator, 22 is a switching cam, 23 is a load conveyance path, and 24 is a sensor.

Claims (1)

[Scope of Claims] 1. A bucket bag whose front end is hinged to the opposite edge of a cargo passage opening, faces opposite each other with the free end facing rearward, and through which the cargo stored in the bag passes backward from the front end. , is provided at a distance behind the free end of the bucket, and a long tube is cut to a predetermined length to form a bag, and the bag is placed at a predetermined position behind the free end of the bucket with the mouth of the bag facing forward. a slider that is reciprocated back and forth between the bucket and the bag supply device; a suction section facing opposite to the front end, and a rear end pivoted to the slider; a pair of upper and lower arms whose front end suction section is positioned over the free end of the bucket when moving forward with the slider, and which is positioned over the mouth of the bag supplied by the bag feeding device when retreating; and one of the two arms. When the upper and lower arms move forward and backward with the slider, the arm extends backward from the arm and has a cam follower attached to the rear end, and when the upper and lower arms move back and forth with the slider, the cam follower rolls, and when moving forward, the suction parts at the front ends of both arms are separated. a cam having a cam surface that spreads the opening of the bag and covers it over the free end of the bucket, and when retracting, brings the suction part closer to pinch the opening of the next bag supplied by the bag feeding device from above and below; A rod connecting a pair of upper and lower arms and interlocking both arms, and a rod provided between the two arms or between each arm and the slider so that the suction section at the front end of both arms pinches the opening of the bag. a spring that biases and presses the cam follower against the cam surface of the cam, a switching cam that can be horizontally connected to and separated from the rear of the cam surface, and a conveying path leading to the bucket. A sensor that detects the presence or absence of a load is activated by the above sensor, and when there is a load on the conveyance path, the switching cam is moved away from the rear of the cam surface, and the slider retreats to move the cam follower to the rear end of the cam surface. When there is no load, connect the switching cam to the rear of the cam surface and guide the cam follower onto the switching cam to remove the bag from the pair of arms. 1. An automatic bag mounting device for a bag filling and packaging machine, comprising an actuator that prevents a suction section at the front end of the arm from pinching the opening of the bag.