JPH0422774B2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) The present invention relates to a packaging machine that sequentially supplies items to a packaging section and packages the same items. The present invention relates to a method for controlling the speed of a feeding conveyor and an apparatus therefor.

(Prior Art) The present applicant has also proposed various packaging machines in which an unwrapped article is guided to a folding device via a conveyor and a pedestal device, and the same article is wrapped in a packaging film in the folding device. Furthermore, the applicant has also proposed various packaging machines that can control production capacity, ie, packaging speed. The pedestal device and the folding device of this packaging machine have a common drive system and are synchronized with each other, whereas the conveyor has an independent drive system. Therefore, as the packaging speed increases, the conveyance speed of the conveyor also depends on the size of the shape of the unpackaged item, that is, the width of the item in the direction of conveyance (hereinafter referred to as vertical width). Regardless of the size (the width of the item in the direction perpendicular to the direction is called the width), it is uniquely raised relative to it. Therefore, the conveyance speed of this conveyor has been determined in advance with respect to the packaging speed based on standard size items. In addition, when placing items on the conveyor, when guiding the items supplied by the conveyor to the packaging section, we temporarily stop and wait at a predetermined location to increase precision so that the items do not interfere with each other in the packaging section. Because of the need to keep the items dry, it is necessary to place the items with a little space between them.

(Problem to be solved by the invention) However, the larger the vertical width of the item, the fewer the number of items that can be placed on the limited length conveyor compared to the smaller the vertical width of the item. When the packaging speed (production capacity) is increased, the conveyance speed is slower than the packaging speed determined based on the standard size of the item, and it is possible to smoothly place the items on the conveyor one after another with a margin. There was a problem that made it impossible. In particular, when the production capacity was increased, the above-mentioned problem became apparent.

Therefore, if the conveyance speed relative to the packaging speed is determined based on the item with the maximum vertical width, the above problem will be resolved, but on the other hand, the conveyance speed will be very high for items with short vertical width, making it difficult to convey them. Thus, conventional conveyors have had problems with speed adjustment when conveying items of various sizes.

Structure of the Invention (Means for Solving the Problems) In order to achieve the above object, the first invention provides a transport speed of a transport belt that transports several types of unwrapped items of different sizes toward the main body of the packaging machine. The conveyance speed of the conveyor belt is set in advance according to the vertical width of the unpackaged item to be conveyed, so that if it is large, it is fast, if it is small, it is slow. The gist of the invention is a method for controlling the speed of a conveyor in a packaging machine, characterized in that the conveyance speed corresponding to the detection signal is read from the set value set above and automatically changed. In a method for controlling the speed of a conveyor in a packaging machine, the conveyance speed of a conveyor belt that conveys several types of unpackaged items of different sizes toward the packaging machine body is changed according to production capacity, The conveyance speed of the conveyor belt, which changes depending on the production capacity, is adjusted according to the vertical width of the unpackaged item to be conveyed. A conveyance conveyor in a packaging machine, characterized in that a conveyance speed is set in advance, and a conveyance speed corresponding to the detection signal is read out from the setting value set in the above using the detection signal of the vertical width, and is automatically changed. The gist of this paper is a speed control method.

Further, in a third aspect of the present invention, a conveyor belt is wound around a roller supported on a frame, and the conveyor belt is driven in a conveyor in a packaging machine that conveys unwrapped items toward a main body of the packaging machine. The data on the conveyance speed of the conveyor motor and conveyor belt is set in advance according to the vertical width of the unpackaged item to be conveyed, so that if it is large, it will be fast, if it is small, it will be slow. a storage means for storing, an article detection sensor for detecting the article, an indexing means for determining the vertical width of the article based on a detection signal from the article detection sensor, and a vertical width of the article determined by the indexing means. The gist of the present invention is a speed control device for a conveyor in a packaging machine, comprising a drive control means for reading out a conveyance speed from the storage means and controlling the drive of the conveyance motor to achieve the read conveyance speed. .

Furthermore, in a fourth aspect of the present invention, a conveyor belt is wound around a roller supported on a frame body, and the conveyor belt is driven in a conveyor in a packaging machine that conveys unwrapped items toward a main body of the packaging machine using the conveyor belt. A conveyance motor, a production capacity setting means for setting the number of items to be wrapped per hour, and a conveyance speed data for each production capacity. a storage means for pre-memorizing settings to adapt to the respective vertical widths, such as "faster if the item is small" and a "slower time if the item is small"; an item detection sensor for detecting the item; an indexing means for determining the vertical width, and data on a transport speed based on the vertical width of the article determined by the indexing means and the production capacity set by the production capacity setting means, and read out from the storage means. The gist of the present invention is a speed control device for a conveyor in a packaging machine, which comprises a drive control means for driving and controlling the conveyance motor to maintain the conveyance speed.

Furthermore, a fifth aspect of the present invention is a conveyor in a packaging machine in which a conveyor belt is passed around rollers supported on a frame body, and the conveyor belt conveys unwrapped articles toward a main body of the packaging machine, in which the conveyor belt is driven. a conveyance motor for activating a conveyance motor, a production capacity setting means for setting the number of items to be packaged per hour, and a first storage means for storing data on the conveyance speed of the conveyor belt for a production capacity below a predetermined production capacity; The data of the conveyance speed of the conveyor belt at the production capacity above the predetermined production capacity is set to a speed higher than the conveyance speed of the conveyor belt for the production capacity below the production capacity, and the vertical width of the unpackaged items to be conveyed. a second storage means that stores in advance settings adapted to each vertical width, such as fast when the vertical width is large and slow when the vertical width is small; an article detection sensor that detects the article; an indexing means for determining the vertical width of the item based on a detection signal from the sensor; a determining means for determining whether the production capacity set by the production capacity setting means is less than a predetermined production capacity; When it is determined that the capacity is below a predetermined production capacity, the conveyance speed data of the conveyor belt for the production capacity at that time is read from the first storage means, and the conveyance motor is drive-controlled to achieve the read conveyance speed. When the first drive control means and the determining means determine that the production capacity is equal to or higher than the predetermined production capacity, the second
a second controller that reads the information from the storage means and drives and controls the conveyance motor to achieve the read conveyance speed;
The gist of this invention is a speed control device for a conveyor in a packaging machine, which comprises a drive control means.

(Function) In the first invention, the conveyance speed of the conveyor belt is automatically changed according to the vertical width of the unpackaged article, and is automatically changed according to a preset value such that it is fast for large items and slow for small items.

In the second aspect of the invention, the conveyance speed relative to the production capacity of the conveyor belt is automatically changed to a preset value according to the vertical width of the unpackaged item, such that it is fast when the width is large and slow when it is small.

In the third invention, when the article detection sensor and the indexing means determine the vertical width of the article guided from the conveyor belt to the packaging machine main body, the drive control means stores the conveyance speed for the determined vertical width of the article. , and controls the transport motor that drives the transport belt to achieve the read transport speed.

In the fourth aspect of the invention, the drive control means reads from the storage means transport speed data based on the vertical width of the article determined by the indexing means and the production capacity set by the production capacity setting means, and the read transport speed Drive control of the transport motor to achieve this.

In the fifth invention, when the determining means determines that the production capacity is below a predetermined production capacity, the first drive control means reads the conveyance speed data of the conveyor belt for the production capacity at that time from the first storage means, The transport motor is drive-controlled to achieve the read transport speed. On the other hand, when the determining means determines that the production capacity is equal to or higher than the predetermined production capacity, the second drive control means adjusts the transport speed for the vertical width of the article at that time determined by the article detection sensor and the indexing means to a second value. The transport speed is read from the storage means, and the transport motor is driven and controlled to achieve the read transport speed.

(Example) An example embodying the present invention will be described below with reference to the drawings.

1 and 2 show a plane and side cross section of the conveyor 1, where the front end of the frame 2 is connected to the packaging machine main body 3.
It is connected and fixed at the center position on the rear side. Rollers 4a and 4b are rotatably attached to the front and rear ends of the frame 2, and a conveyor belt 5 is stretched around both rollers 4a and 4b to form a first conveyor section 1a. Also, rollers 6a and 6b are rotatably attached to the front end of the frame 2 and adjacent to the roller 4a, and twelve round belts 7 are stretched around both rollers 6a and 6b at equal intervals. It constitutes the second transport section 1b.

A conveyance motor 8 is fixed to the frame 2 below the front side of the conveyance belt 5, and a drive gear 9 attached to the drive shaft thereof is connected to intermediate gears 10, 11 which are rotatably supported with respect to the frame 2. The roller 4a is meshed with a gear 12 fixed to one side of the roller 4a. Further, the intermediate gear 11 has the intermediate gear 1
It meshes with a small gear 14 fixed to a driven shaft 13 rotatably attached to the frame 2 at a position on the front side of the rotating shaft 11a. A sprocket wheel 15 is fixed to the driven shaft 13, and a sprocket wheel 16 is fixed to one side of the roller 6b.
A chain 17 is stretched between the two.

Therefore, when the conveyance motor 8 rotates in the direction of the arrow in FIG. It is transported to the 3rd side.

In addition, in this embodiment, the transport speed of the second transport section 1b is configured to be faster than the transport speed of the first transport section 1a, and the interval between articles W, which will be described later, arriving at the second transport section 1b is I'm trying to open it with this speed difference.

An electromagnetic brake 18 is attached to the rotating shaft 11a, and when the electromagnetic brake 18 is activated, the rotation of the intermediate gear 11, that is, the rotating shaft 11a, is forcibly stopped. Therefore, when the conveyance motor 8 is turned off and is rotating by inertia, both belts 5 and 7 can be immediately stopped by operating the electromagnetic brake 18.

Guide bars 21 are disposed on both left and right sides above the first and second conveyance sections 1a and 1b, and each of the left and right guide bars 21 has a pair of front and rear support arms 22 extending from the outside to the inside of the frame 2.
It is rotatably supported. The support arm 22 is provided with a spacing adjustment device 23 on the lower front side of the frame 2, and by operating the operating handle 24 of the device 23, each of the support arms 22 is rotated, and the left and right guide bars are rotated. 21 interval D
It is now possible to adjust the That is, the distance D between the guide bars 21 is adjusted in accordance with the width D1 of the article W conveyed on the conveyor belt 5 and the round belt 7 (width of the article W in the direction orthogonal to the conveyance direction). The center of the first and second conveyance sections 1a and 1b is conveyed in the correct direction.

Next, a description will be given of a supply device 30 that is provided in the packaging machine main body 3 and supplies the articles W conveyed by the conveyor 1 to the article receiving device.

A driven roller 32 and a driving roller 33 are rotatably supported between the base end portions and between the center portions of a pair of left and right frames 31 arranged and fixed within the packaging machine main body 3, and both rollers 32, 33 have a Twelve round belts 34 are stretched at equal intervals so as to be located on the same straight line as each round belt 7 of the second conveyance section 1b, thereby forming a first supply section 30a.

A plurality of brackets 36 are fixed to a connecting plate 35 installed between a pair of left and right frames 31 on the front side of the drive roller 33 at equal intervals so as to project forward. A driven roller 37 is rotatably supported. A round belt 38 is stretched between the drive roller 33 and the driven roller 37, respectively, and constitutes a second supply section 30b. A sprocket wheel 39 is attached to one end of the drive roller 33.
is attached, and a chain 40 is stretched across it.
Therefore, when the drive roller 33 rotates in the direction of the arrow in FIG. 2 based on the drive of the sprocket wheel 39, the article W placed on the upper side of the round belts 34, 38 is conveyed in the direction of the arrow. .

A rotary arm 42 is rotatably supported at the center of a support 41 installed between the frames 31 on the front side of the driven roller 32, and a comb-shaped stopper is provided at the tip of the rotary arm 42. A member 43 is attached. A roller 44 is rotatably supported at a substantially intermediate position of the rotating arm 42.
The cam 46 is in contact with a cam 46 fixed to a cam drive shaft 45 installed between the frames 31 . Then, due to the rotation of this cam 46, the rotating arm 42 moves to the roller 44.
The stopper member 43 is rotated in the vertical direction about the base end via the round belt 34, and the stopper member 43 is made to protrude upward from the round belt 34 or, conversely, to be retracted downward.

The protrusion and retraction are performed once every rotation of the cam 46, that is, the cam drive shaft 45, and the timing of the protrusion and retraction is determined in advance by the shape of the cam 46. Therefore, the article W conveyed through the first supply section 30a is stopped by the stopper member 4.
3 protrudes, the round belt 34 is stopped even though it is rotating.

A sprocket wheel 47 is fixedly attached to one end of the cam drive shaft 45, and a chain 40 that is stretched around the sprocket wheel 39 of the drive roller 33 is stretched around the wheel 47. The number is preset to rotate at a rotational speed equal to the production capacity of the packaging machine, that is, the number of items that can be wrapped in one minute.

An article pedestal device 48 having a number of pedestals 48a is installed below the second supply section 30b so as to be movable up and down relative to the packaging section (not shown) of the film folding device located above. When this pedestal device 48 is in the lowered position shown in FIG. 2, each pedestal 48a is positioned between the round belts 38. By moving the article holder device 48 in this lowered position upward, the articles W conveyed on the round belt 38 are received by each holder 48a and guided to the packaging section located above. It's summery.

It should be noted that the number of vertical movements per minute in this article holder device 48 is equal to the number of articles that can be packaged in one minute.

Further, the timing for raising and lowering the article supply device 48 is such that the pedestal device 48 moves upward when the stopper member 43 is retracted and the article W is conveyed to a position directly above the pedestal 48a by the round belts 34, 38. On the contrary, when the stopper member 43 protrudes to restrict the conveyance of the article W and there is no article W in the second supply section 30b, the pedestal device 48 descends to the lowered position.

The positioning device 49 is disposed on the front side of the supply device 30, and comes into contact with the front side of the article W conveyed by the round belt 38 to stop the article at a position above the article holder device 48. , cradle device 4
The same item W can be surely placed on the pedestal 48a of No. 8.

Next, a drive mechanism for driving the supply device 30 will be explained.

In FIG. 3, a transmission 52 is connected to the drive shaft of a drive motor 51, and a sprocket wheel 54 is attached to a reduction shaft 52a (1/20 of the rotation speed of the motor) of the transmission 52. The chain 40 is suspended between a sprocket wheel 39 attached to the drive roller 33 and a sprocket wheel 47 attached to the cam drive shaft 45. Therefore, the round belt 34,
38 and the stopper member 43 are operated by a drive motor 51. The drive motor 51 drives the supply device 30 for the round belts 34 and 38 and the stopper member 43, and also drives the article receiving device 48.
It also drives a packaging film conveying device and a film folding device (not shown).

A rotary encoder 55 is provided on the output shaft 52b of the transmission 52 (1/1 of the rotation speed of the motor).
is provided to detect the rotation of the coaxial shaft 52b.
Further, the output shaft 52b is provided with a rotary encoder 55 on a driven shaft 58 provided with a clutch brake 57 via a timing belt 56.

Next, each sensor for detecting the article W conveyed by the conveyor 1 and the supply device 30 will be explained.

In FIG. 2, the first sensor 61 is attached to the upper center of the rear surface of the packaging machine main body 3 at the upper front side of the second conveyance section 1b, and the first sensor 61 is attached to the upper front side of the second conveyance section 1b. Detect W. This detection signal is used to turn off the power to the transport motor 8 and stop it. The second sensor 62 is attached to the upper center of the rear surface of the packaging machine main body 3, and detects the article W being conveyed to the front end of the second conveyance section 1b. This detection signal is then used to operate the electromagnetic brake 18.

The third sensor 63 is a sensor consisting of a light emitting element 63a and a light receiving element 63b.
3a and 63b are provided to face each other, and detect the article W stopped by the stopper member 43 in the second supply section 30a. This detection signal is used to operate a film supply device (not shown).

The fourth sensor 64 is a sensor consisting of a light-emitting element 64a and a light-receiving element 64b, and is provided on both sides of the second conveying section 30a of the supplying device 30 at a substantially intermediate position so that both elements 64a and 64b face each other. The passage of the article W being conveyed to a position directly above the pedestal device 48 is detected. This detection signal is then used to determine the vertical width D2 of the item W (width of the item W in the direction orthogonal to the width D1).

Next, the electrical configuration of the packaging machine configured as described above will be explained.

In FIG. 4, a microcomputer 70 includes a central processing unit (hereinafter referred to as CPU) 71, a program memory 72 consisting of a read-only memory (ROM), and a working memory 73 consisting of a readable and rewritable memory (RAM). It is built into a control box (not shown) provided in the packaging machine. The CPU 71 operates based on the control program stored in the program memory 72. In addition to the control program, the program memory 72 stores the rotational speed of the transport motor 8, that is, transport speed data, and the rotation speed data of the drive motor 51.

As shown in FIG. 5, the conveyance speed data is data on the conveyance speed of the conveyor 1 with respect to production capacity, and in this embodiment, when the production capacity (number of packages per minute) is in the range of 25 to 40 pieces, The conveyance speed V1 increases in proportion to the production capacity, and the production capacity increases from 41 to 70.
In this range, two types of transport speeds V2 and V3 (>V1) are selected depending on the vertical width D2 of the item W. Then, when the vertical width D2 of the article W is 80 to 129 mm, the conveyance speed V2 is selected, and when the vertical width D2 is 130 to 180 mm, the conveyance speed V3 faster than the conveyance speed V2 is selected. It's getting old.

In this embodiment, when the items W are continuously conveyed on the conveyor 1, when the vertical width D2 of the item W changes from an item W smaller than 129 mm to an item W with a vertical width D2 larger than 129 mm, Vertical width D
The conveyance speed does not change from V2 to V3 unless the item W is 141 mm or larger. Conversely, when the vertical width D2 of the item W changes from an item W larger than 130 mm to an item W with a vertical width D2 smaller than 130 mm, the conveyance speed changes from V3 to V2 unless the vertical width D2 is 120 mm or less. It seems like it won't change.

The rotational speed data of the drive motor 51 is data of the rotational speed of the drive motor 51 with respect to the production capacity, and the rotational speed data of the drive motor 51 is the data of the rotational speed of the drive motor 51 with respect to the production capacity (number of packages per minute).
In other words, the number of rotations of the output shaft 52a of the transmission 52 is made to match the number of packages per minute.

The working memory 73 is designed to temporarily store the results of calculations performed by the CPU 71.

Packing quantity setting device 7 as production capacity setting means
4 is provided in front of the control box, and allows the number of packages to be packaged per minute to be selected from a range of 25 to 70. Then, the packaging number setting device 74
outputs the set value to the CPU 71. and,
Based on this set value, the CPU 71 controls the drive motor 5.
The rotation speed of the conveyance motor 8 is controlled when the rotation speed of 1 and the production capacity is 40 or less.

Further, the CPU 71 is configured to input detection signals from the first to fourth sensors 61 to 64. Then, the CPU 71 connects the first sensor 61
The power to the transport motor 8 is turned on and off based on the detection signal of the second sensor 6
The electromagnetic brake 18 is turned on and off based on the second detection signal. Further, the CPU 71 calculates the vertical width D2 of the article W based on the detection signal of the fourth sensor 64. And CPU71
controls the conveyance speed of the conveyance motor 8 when the production capacity is 41 pieces or more based on this vertical width D2.

Next, the operation of the conveyor configured as described above will be explained.

Now, with the production capacity set at 35 pieces in the packaging quantity setting device 74, the articles W having a vertical width D2 of 100 mm are sequentially conveyed at regular intervals by the conveyor belt 5, and are transferred to the supply device 30 and the article holder. When packaging is carried out in the packaging section via the device 48, the CPU 71 reads data on the rotational speed of the drive motor 51 with respect to the set values (35 pieces) from the program memory 72 and sets the drive motor 51 to the same rotational speed. At the same time, the current set value (35
The data on the conveyance speed V1 of the conveyor belt 5 for each of the following data is read from the program memory 72 and the conveyance motor 8 is driven and controlled so as to achieve the same conveyance speed V1.

In this state, the article W transported by the transport belt 5 is transported to the second transport section 1b at a transport speed of V1. The article W transported to the second transport section 1b is fed to the supply device 30 by the round belt 7 of the second transport section 1b.
transported to. When the first sensor 61 detects the article W during the conveyance of the conveyance section 1b,
In response to this detection signal, the CPU 71 turns off the power to the transport motor 8 and stops it. Based on this power cutoff, the motor will stop while rotating due to inertia. At this time, the conveyor belt 5 and the round belt 7 are operated by inertia to convey the article W. Then, when the article W is conveyed by inertia and reaches the front end of the second conveyance section 1b and the second sensor 62 detects the tip, the CPU 71 activates the electromagnetic brake 18 based on this detection signal to stop the conveyor belt 5. Then, the inertia operation of the round belt 7 is stopped, and the product W is stopped and stood by in order to wait for the timing to send the article W to the supply device 30 at the front end position of the second conveyance section 1b.

This timing is determined by the first supply section 30 of the supply device.
When the preceding article W, which has been stopped by the stopper member 43 at point a, is released from the stop based on the retraction of the stopper member 43 and is sent to the second supply section 30b, and the same member 43 protrudes upward again, the electromagnetic brake 1
8 is released, and the conveyance motor 8 is driven again so that the conveyance speed of the conveyor belt 5 becomes V1. Based on this drive, the article W waiting at the front end of the first transport section is sent out to the first supply section 30a. Therefore, the conveyor belt 5 and round belt 7 of the conveyor 1 are intermittently operated at the conveyance speed V1.

The article W sent to the first supply section 30a is already stopped by the stopper member 43 projecting upward, and waits for the timing to feed it to the second supply section 30b. This timing is determined by the second supply section 3.
When the article receiving device 48 guides the preceding article W conveyed to 0b to the packaging section above it and returns to the lowered position again, the stopper member 43 is retracted and sent out to the second supply section 30b. It is.

The fourth sensor 64 detects passage of the article W while the article W is fed into the second supply section 30b and transported to the upper position where the pedestal device 48 is waiting. Based on this detection, the CPU 71 calculates that the vertical width D2 of the same item W is 100 mm, but in this state, the number of packages is 35, so the conveyance speed of the conveyor belt 5 is controlled based on the vertical width D2. There isn't.

The vertical width D2 is calculated based on the time required for the article W to pass through the fourth sensor 64. That is, the fourth sensor 64 is the light emitting element 64
A and the light receiving element 64b are turned off when the leading edge of the item W reaches therebetween, and turned on when the trailing edge of the item W passes, so the off time and the conveyance speed of the round belt 38 of the second supply section 30b Calculated based on
Note that, as described above, the conveyance speed of the round belt 38 of the second supply section 30b is determined by the rotation speed of the drive motor 51, so once the number of packages to be packaged is set, the rotation speed of the drive motor 51 is determined. It can be easily obtained from When the item W is transported to the upper position where the pedestal device 48 is waiting, the pedestal device 48 moves upward to guide the item W to the packaging section above.

In this way, when the number of packages to be packaged is appropriately selected in the range of 25 to 40 by the package number setting device 74, the conveyance speed V1 of the conveyor is proportional to the number of packages, similar to the drive motor 51.

Next, from this operating state, the packaging number setting device 74
When the number of packages is changed from 35 to 50, the CPU 71 immediately stops the transport motor 8 and controls the rotational speed of the drive motor 51 to a rotational speed corresponding to this set value. Then, the supply of the articles W to the supply device 30 is temporarily stopped, and the wrapping of all unwrapped articles W in the packaging machine main body 3 is completed. When the packaging of the article W in the packaging machine body 3 is completely completed, the CPU 71 first drives and controls the transport motor 8 to drive the transport belt 5 at a predetermined low transport speed. Then, when the first item W passes the fourth sensor 64, the CPU 71 determines the vertical width D of the item W.
2 is calculated to be 100 mm, the CPU 71 determines that the vertical width D2 of the items W to be sequentially conveyed from the conveyor 1 is 100 mm, which is less than 130 mm. to drive and control.

Therefore, the packaging quantity setting device 74 determines the packaging quantity.
When the number of packages is appropriately selected in the range of 41 to 70, the conveyance speed of the conveyor becomes a constant conveyance speed V2 which is not proportional to the number of packages, as shown in FIG.

Next, a case will be described in which the article W to be placed on the conveyor belt 5 is changed from this operating state to an article W having a vertical width D2 of 100 mm to 150 mm.

Now, after the last item W with a vertical width D2 of 100 mm is placed on the conveyor belt 5, the vertical width D2 is 150 mm.
Items W of 150 mm are sequentially placed on the conveyor belt 5 in order to package items W of 150 mm. At this point, the conveyance belt 5 is being operated at a conveyance speed V2 for a vertical width D2 of 100 mm. Then, when the last item W with a vertical width of 100 mm is guided to the packaging section and the first item W with a vertical width of 150 mm passes the fourth sensor 64, the sensor 64 detects its passage.

Based on this detection signal, the CPU 71 determines that the article W having a vertical width of 150 mm has passed. and,
From now on, the CPU 71 sets the conveyance speed of the conveyor belt 5 to V, assuming that the article W to be packaged has a vertical width of 150 mm.
The transport motor 8 is driven and controlled so as to make the number 3. Therefore, the packaging number setting device 74 determines the packaging number from 41 to 70.
When the speed is appropriately selected within the range of 1 to 1, the conveyance speed of the conveyor becomes a constant conveyance speed V3 which is faster than the conveyance speed V2, which is not proportional to the number of packages, as shown in FIG.

Therefore, when an item W with a large vertical width D2 is placed on the conveyor belt 5, which can only be placed in a limited number, the item W placed first is transported forward quickly, so that the difference between the items W and the item W is It will be much easier to space them out.

On the other hand, if the vertical width of the item W is changed from 150 mm to, for example, 110 mm, the CPU 71 determines whether the item W has a vertical width of 119 mm based on the detection signal from the fourth sensor 64 as described above. It is determined that the speed has changed to W, and the conveyance speed is reduced to V2.

In this way, in this embodiment, the conveyance speed of the conveyor 5 is controlled according to the number of packages packed by the packaging machine and the vertical width D2 of the article W, so that the article can be conveyed smoothly regardless of the size of the article. At the same time, it is possible to improve the efficiency of the work of placing items on the conveyor.

Note that this invention is not limited to the above-mentioned embodiment, and for example, when the vertical width D2 is large, the fifth
As shown by the two-dot chain line in FIG. 2, the conveyance speed V3 of the conveyor belt 5 may be increased proportionally as the number of packages increases.

Furthermore, as shown in FIG. 6, data on conveyance speed relative to production capacity is
2a, D2b, D2c, D2d, (D2a>D2
b>D2c>D2d), and the conveyance speed may be controlled according to the vertical width and production capacity. In this case, each data must be stored in the program memory 72 in advance.

Furthermore, in the above embodiment, the conveyance speed was changed according to the production capacity, but in a fixed packaging machine whose production capacity cannot be changed, the product W
The conveyance speed may be changed depending on the vertical width D2 of the paper.

Effects of the Invention As detailed above, according to the present invention, the conveyance speed is automatically controlled according to the vertical width of the unpackaged item to be conveyed, so that if it is large, the conveyance speed is fast, and if it is small, it is slow. Items can be transported smoothly regardless of their size, and the efficiency of placing items on the conveyor can be improved.

[Brief explanation of drawings]

Fig. 1 is a plan view of a conveyor embodying the present invention, Fig. 2 is a side sectional view thereof, Fig. 3 is a mechanical diagram for explaining the drive system of the packaging machine, and Fig. 4 is an electric block circuit diagram. , FIG. 5 is a diagram showing the relationship between the conveyance speed and the number of packages to be packaged, and FIG. 6 is a diagram showing the relationship between the conveyance speed and the production capacity at each vertical width of the article. In the figure, 1 is a conveyor, 1a is a first conveyor, 1b is a second conveyor, 2 is a frame, 3 is a packaging machine body, 4a, 4b are rollers, 5 is a conveyor belt, 7 is a round belt, 8 is a transport motor, 18 is an electromagnetic brake, 30 is a supply device, 33 and 38 are round belts, 43 is a stopper member, 51 is a drive motor, 6
1 is a first sensor, 62 is a second sensor, 64 is a fourth sensor, 70 is a microcomputer, 7
1 is a CPU, 72 is a program memory, 74 is a packaging number setting device, W is an item, and D2 is a vertical width.

Claims (1)

[Claims] 1. The conveyance speed of the conveyor belt 5, which conveys several types of unwrapped articles W of different sizes toward the packaging machine main body 3, is determined by adjusting the vertical width D2 of the unwrapped articles W to be conveyed. Depending on the size, the conveyance speed of the conveyor belt 5 adapted to each vertical width D2 is set in advance, such as fast for large and slow for small. A method for controlling the speed of a conveyor in a packaging machine, characterized in that the corresponding conveyance speed is read out and automatically changed. 2. A conveyor in a packaging machine in which the conveyance speed of the conveyor belt 5 that conveys several types of unpackaged items W of different sizes toward the packaging machine main body 3 is changed according to the production capacity. In the speed control method, the conveyance speed of the conveyor belt 5, which changes depending on the production capacity, is set according to the vertical width D2 of the unpackaged item W to be conveyed, such that it is fast when it is large and slow when it is small. The conveyance speed of the conveyor belt 5 adapted to the vertical width D2 is set in advance, and
A method for controlling the speed of a conveyor in a packaging machine, characterized in that the conveyance speed corresponding to the detection signal is read out from the set value set in the above based on the detection signal, and is automatically changed. 3. In a conveyor in a packaging machine in which a conveyor belt 5 is stretched around rollers 4a and 4b supported on a frame 2, and the conveyor belt 5 conveys unwrapped items W toward a packaging machine main body 3, the conveyor belt 5 Conveyance motor 8 that drives
The data on the conveyance speed of the conveyor belt 5 is determined according to the vertical width D2 of the unpackaged item W to be conveyed, and the respective vertical widths D are set as follows:
2; an article detection sensor 64 for detecting the article W; and a storage means 72 for determining the vertical width D2 of the article W based on the detection signal from the article detection sensor 64. Output means 71
and a drive control means 7 that reads the conveyance speed for the vertical width D2 of the article W determined by the indexing means 71 from the storage means 72 and controls the drive of the conveyance motor 8 to achieve the read conveyance speed.
1. A speed control device for a conveyor in a packaging machine. 4. In a conveyor in a packaging machine in which a conveyor belt 5 is stretched around rollers 4a and 4b supported on a frame 2, and the conveyor belt 5 conveys unwrapped items W toward a packaging machine main body 3, the conveyor belt 5 Conveyance motor 8 that drives
, a production capacity setting means 74 for setting the number of items W to be packaged per hour, and data on the conveyance speed for each production capacity depending on the size of the vertical width D2 of the unwrapped article W to be conveyed. A storage means 72 that stores in advance settings such as "fast" and "slow" to adapt to the vertical width D2; an article detection sensor 64 that detects the article W; and a detection signal from the article detection sensor 64. indexing means 71 for determining the vertical width D2 of the article W
Then, data on the transport speed based on the vertical width D2 of the article W determined by the indexing means 71 and the production capacity set by the production capacity setting means 74 is read from the storage means 72, and the read transport speed is set. A speed control device for a conveyor in a packaging machine, comprising a drive control means 71 for driving and controlling the conveying motor 8 to achieve the desired speed. 5. In a conveyor in a packaging machine in which a conveyor belt 5 is stretched around rollers 4a and 4b supported on a frame 2, and the conveyor belt 5 conveys unwrapped items W toward a packaging machine body 3, the conveyor belt 5 Conveyance motor 8 that drives
, a production capacity setting means 74 for setting the number of items W to be packaged per hour, and a first storage means 72 for storing data on the conveyance speed V1 of the conveyor belt 5 for a production capacity below a predetermined production capacity. , the data of the conveyance speed V2, V3 of the conveyor belt 5 at the production capacity above the predetermined production capacity is set to a speed higher than the conveyance speed V1 of the conveyor belt 5 at the production capacity below the production capacity, and the unwrapped unpacked to be conveyed. Depending on the size of the vertical width D2 of the item W,
a second storage means 72 that stores in advance settings such as "faster if larger and slower if smaller" adapted to each vertical width D2; an item detection sensor 64 that detects the item W; and the item detection sensor 64. Indexing means 71 for determining the vertical width D2 of the article W based on the detection signal from the
and a determination means 71 for determining whether the production capacity set by the production capacity setting means 74 is below a predetermined production capacity; and when the determination means 71 determines that the production capacity is below the predetermined production capacity, the a first drive control means 71 that reads conveyance speed data V1 of the conveyance belt 5 for the current production capacity from a first storage means 72, and drives and controls the conveyance motor 8 to achieve the read conveyance speed V1; When the determining means 71 determines that the production capacity is equal to or higher than the predetermined production capacity, the second storage means 72 stores the transport speeds V2 and V3 for the vertical width D2 of the item W at that time determined by the indexing means 71. The read conveyance speeds V2 and V3 are read from
a second drive control for driving the conveyance motor 8 in order to
A speed control device for a conveyor in a packaging machine, comprising a drive control means 71.