JPH0232917A - Device for feeding band in packaging apparatus - Google Patents

Abstract

PURPOSE:To reduce feeding error at the time of re-supplying a packing band by a method wherein a device for detecting the tip of the wrapping band controls tightening action of a feed roller while if the tip is not detected, tightening of the feed roller is limited to a very short time and feeding is resumed after a specified time has elapsed. CONSTITUTION:When a switch 31 detects passage of a wrapping band B, a motor M1 halts to stop feeding the band by a feed roller F. If the tip of the wrapping band B reaches a switch 11 at this time, a motor M2 which drives a cam mechanism K activates, a first grip G1 is moved to the side of a slide table 10, and the tip of the wrapping band B is held. Completion of grip operation is detected by a switch 21 so that the motor M2 stops and the motor M1 is reciprocated. At the same time, a timer 41 as a device for controlling tightening activates to carry out tightening. Then the motor M1 stops and the motor M2 reactivates to have a second grip G2 moved to the slide table 10 to grip the feed roller F side of the wrapping band B.

Description

[Detailed Description of the Invention] [Field of Application] The present invention relates to a band feeding device in a packing machine, and in particular, to temporal management of the operation from a specific point in time until the feeding of the packing band is completed until the tightening of the packing band is completed. This invention relates to a band feeding device of a type of packing machine that adjusts the tightening degree, and solves the inconvenience when the packing band is incompletely fed, that is, when the tightening operation progresses during the incomplete feeding. This is intended to prevent the inconvenience of the packaging band being completely pulled back from the supply route to the band pool or band reel.

[Prior art and its problems] A type that adjusts the degree of tightening by temporally managing the operation from a specific point after the start of packing work until the completion of feeding of the packing band until the completion of tightening of the packing band. A packaging machine has already been disclosed in Japanese Patent Publication No. 83-11203.

(Refer to Figure 5) According to this conventional method, from the time when the object to be packed is placed on the table or from the time when the band completes going around the object to be packed, to the point at which tightening is completed (grip operation for band welding) The time required to reach the completion point can be adjusted. Therefore, by adjusting the required time, this conventional method can be used for a wide range of purposes, from packaging of flexible items to packaging of hard items. No influence of force etc. occurs.

However, in this conventional method, the tightening operation is started without confirming by some means that the first grip (G) gripping the tip of the packing band has been performed. Grip (G1
), the packing band (B) will be pulled out of the band supply path (A) at the time of tightening, and in order to perform the packing operation again, the packing band must be placed in the packing machine again. There is an inconvenience that it has to be set.

In order to prevent such inconveniences, some products are equipped with an automatic feeding device that pulls out a certain amount of packaging bands from a band reel and stores them in a band boule, and automatically supplies the bands to the feed roller (F). . In this case, when the packing band (B) is pulled out from the band supply path (A), by performing the packing operation again, it passes from the band boule to the band supply path (F) via the feed roller (F). Since the packing band (B) can be re-supplied to the packing machine A), even if the packing band (B) is pulled out as described above, the packing band (B) must be set again in the band supply path of the packing machine, such as a book. No hassle.

However, with this conventional device, feeding errors are likely to occur between the automatic feeding device and the packing band (8) through the band feeding path (A) to the first grip (G1). Feeding errors are likely to occur in the device and band supply path (^).

This is the packaging band (B) that had a grip failure on -1.
In this case, the tip of the packing band CB) is often bent, and this causes the band to cross the wall that constitutes the path in the middle of the band's movement path when moving over a long path. This is because those who are easily caught will get angry.

[Technical Problem] The present invention is such that the packing band (B) is sent around the outer periphery of the object to be packed by the r packing operation signal, and then the first grip (G,) completes the gripping operation. The feed roller (F) is equipped with a feed roller (F) that performs the tightening operation after the feeding operation is completed.
In the packaging machine 1, the degree of tightening is adjusted by adjusting the tightening operation time of the feed roller (F) after the feeding operation of the first grip (F) is stopped.
To reduce the feeding length when refeeding the packing band (B) in order to reduce feeding errors when refeeding the packaging band (B) in the case of grip failure due to G1) or in the case of no gripping. is the technical issue.

[Technical Means] The technical means of the present invention taken to solve the above-mentioned technical problem is a feeding stop means (a feeding stop means () for stopping the feeding operation of the feed roller (F) at the end of the feeding operation of the packing band (B). 3), and the tip of the packing band (B) is placed near the first grip (G1).
) is provided, and the leading end detecting means (1) detects the leading end of the packing band (B) after the feeding stop means (3) is activated. Tightening control means includes an initial grip control device (2) that sometimes performs a gripping operation of the first grip (G1), starts a tightening operation of the feed roller (F) after the gripping operation is completed, and controls the tightening operation time. (4
), and the tip detection means (1) is equipped with a packing band (
B) a pull-back control means (5) that limits the tightening operation time of the feed roller (F) to an extremely short time based on the output when the tip of the bow is not detected; and this bow-return control means (5).
The feed roller (F) is provided with means (6) for restarting the feeding operation of the feed roller (F) continuously or by a specific operation when a set time has elapsed. (See Figure 1) [Operation] The above technical means of the present invention operates as follows.

Under normal conditions, when the feeding operation of the packing band (B) is completed, its tip passes through the first grip (G1) and reaches the proper position, which is detected by the tip detection means (1). Thereafter, during the operation of the initial grip control device (2), the feed stopping means (3) of the first grip (G1) is activated.
), the subsequent tightening operation progresses by the operation of the tightening control means (4), and the pullback control means (4) proceeds.
5) does not operate, the feed roller (F) operates until the final tightening is completed, and the feed roller (F) does not operate until the final tightening is completed.
F) stops.

Thereafter, the welding operation and band cutting operation of the packaging machine proceed to complete the packaging.

Next, if there is an abnormality in the feeding operation in the middle of the band supply path (A) during the feeding operation of the feed roller (F), the tip detection means (1) detects the packing band during the operation of the feeding stop means (3). (B) will not be detected, the initial grip control device (2) will not operate, and the pullback control device (
5) is activated. Therefore, if the band feeding is stopped with the tip of the packing band CB) caught in a part of the band supply path (A), the packing band (B) is Only feed roller (
F) is pulled back by

As a result, the above-mentioned caught state of the tip of the packing band (B) is released, and the normal state is restored. Then, the packing operation is started again automatically or by a specific operation, and when the packing band (B) is normally fed into the first grip (G1), a series of operations of tightening φ and cutting during welding proceed. becomes.

In this way, if the packing band (B) has a feeding failure, it will be pulled back by a certain amount, and the packing band (Bl force) will be pulled back to the starting point of the band supply path (A). Compared to the conventional device described above, the moving distance of the tip of the packing band (B) when the packing operation is resumed is shorter.

[effect] Since the present invention has the above configuration, it has the following unique effects.

In the event that the packing band (B) is sent incorrectly,
Since the moving distance of the tip of the packing band (B) when the packing operation is resumed is shorter than that of the conventional method described above, in which the tip of the packing band (B) is pulled back to the starting point of the band supply path (A), feeding defects at this time are less likely to occur. Become.

Furthermore, since the length of pulling back of the packing band (B) when the packing operation is restarted is short, the packing operation time can be shortened accordingly.

[Example] Hereinafter, an example of the present invention will be described based on FIGS. 2 to 4.

In this embodiment, the configuration is as shown in FIGS. 2 and 4, and the drive roller (7
1) and a driven roller (72).
) is rotationally driven, and this first motor (M l ) is rotated in forward and reverse directions by inputting a predetermined signal. In addition, the gripping operation of the tip of the packaging band (B) by the first grip (G1) and each operation for welding and cutting are performed by the second motor (
It is controlled by a known cam mechanism (K) that is interlocked with M2).

The packing band (B) rotates (feed roller CF) corresponding to the forward rotation of the first motor (MI).
The band is supplied to the band supply path (8) by normal rotation of
A second switch (]1) serving as the tip detection means (1) is disposed at a position that coincides with the grip (G2). Further, a first switch (31) constituting a part of the feed stop means (3) is disposed on the front side of the slide table (lO), and a part of the first switch (31) is provided with a first switch (31). When part of band (B) is present, this switch is in the on state.

The configuration for stopping the supply of the packing band (a) at a predetermined position is similar to that disclosed in Japanese Utility Model Publication No. 82-7521, and the first switch (31
A combination of a first timer (33) that becomes activated when the first motor (M1) is closed and a brake (34) interposed in the transmission path from the first motor (M1) to the feed roller (F) is adopted. Therefore, in this embodiment, the combination of the first switch (31) and these devices functions as the feed stop means (3).

Next, the second grip (G2) moves the part of the packing band (Bl) on the feed roller (F) side to the slide table (1).
0) to maintain the packing band (B) in this tightened state at the time of completion of tightening, and the combination mechanism of the cam mechanism (2) and this second grip (G2) and A known control mechanism can also be used as is.

Further, the tightening operation after the vicinity of the tip of the packing band (B) is held between the slide table (10) and the first grip (G1) is performed by the third grip that detects the completion of the operation of the first grip (G1). It is started by a signal from a switch (21), and the amount of tightening is controlled by a second timer (4 units) whose setting time is variable.

Next, a third timer (51) as a pullback control means (5)
) is activated by the output when the second switch (11) is in the OFF state at the end of supply of the packing band CB), and the setting time for this is an extremely short time of 1 second or less, for example, 0. It is set to about .1 to 0.5 seconds. Then, when this third timer (51) times up,
The fourth timer (61) is activated, and by the output of this fourth timer (61) when the time is up,
A starting signal for the packing operation is generated. Therefore, in this embodiment, if a feeding error occurs, the packing operation is automatically restarted.

In this embodiment, the control of each of the above-mentioned parts is performed by a microcomputer, and its program is created to perform operations according to the flowchart shown in FIG.

Hereinafter, the operation of the computer and the operation of each part will be explained based on this flowchart.

By the starting operation, the electromagnetic clutch (3) inserted into the transmission system from the first motor (M,) to the feed roller (F) is activated.
2) is in the transmission state, at the same time the first motor (M,) is in the operating state, and the packing band (B) is in the band supply path (^
).

Next, when the first switch (31) in front of the slide table (10) detects the passage of the packing band (8), the first timer (33), which sets the time required until the band supply stops, operates; , the electromagnetic clutch (32) becomes non-transmitting, and the first motor (M1) stops.

During this time, the packing band (Bl) is further fed due to inertia, and when the set time of the first timer (33) has elapsed, the brake (
34) is activated and the band feeding is stopped by the feed roller CF).

At this time, the tip of the packing band (B) should touch the second switch (11
), the output of this operates the second motor (M2) that drives the cam mechanism (l(), and the first
The grip (G,) is moved six times toward the slide table (10), and the operation of clamping the tip of the packing band (B) progresses. At the end of the gripping operation, a third switch (which is interlocked with the rotating shaft of the cam mechanism and has a normally closed output contact) is activated.
21), and when the third switch (21) is turned off, the output at this time causes the second motor (M2) to stop and the first motor (M,) to drive in reverse. It will be done. At the same time, tightening control means (4)
The second timer (41) operates, and the tightening operation progresses.

When the time set by the second timer (41) has elapsed, the first motor (M1) stops, and at the same time, the second motor (M2) restarts and the second grip (G2) moves towards the slide table (10).
Feed roller (F) of packing band (B) with 8 shifts on the side
Grip the sides. Thereafter, as in the conventional case, the work of welding the band overlapping part and cutting the packing band CB near the welded part is performed to complete the packing.

Next, the tip of the packing band CB) is connected to the second switch (11
) If the tip of the packing band (B) gets caught in the middle of the band supply path (8), the second switch (11) is turned on when the first timer (33) times up. Therefore, although the first motor (M1) reverses with the brake (34) turned off, the reversal operation time at this time is the one set by the third timer (51), and the tightening operation ( After the pull-back operation) progresses, the first motor (M1) stops.

Thereafter, the fourth timer (61) as a means (6) for restarting the packing operation is activated, and when the set time has elapsed, a signal for starting the packing operation is inputted by the output of the fourth timer (61). The feeding operation will be resumed.

After that, the tip of the packing band (B) will be the first switch (31).
When it passes through and reaches the second switch (11), the packing operation proceeds in the same manner as in the normal case described above.

In this way, in the event of a feeding error, the intended repacking operation will be performed.

In the above embodiment, when the fourth timer (61) times up, the packing operation after the feeding operation automatically proceeds, but when the fourth timer (61) times up, the operation of each part is stopped. Alternatively, the starting operation switch may be operated again.

Further, although the operation of the brake (34) is controlled by the output of the first timer (33), the operation of the second switch (11
) may turn on the brake (34).

Furthermore, pullback control means (5) in case a feeding error occurs
Regarding this, it is sufficient that the feed roller (F) is operated in the tightening direction for a certain period of time and then stopped, and it goes without saying that any known method other than the above may be employed.

[Brief explanation of the drawing]

Fig. 1 is an explanation of the principle of the present invention, Fig. 2 is a schematic explanatory diagram of an embodiment of the invention, Fig. 3 is an explanatory diagram of its drive system, Fig. 4 is a flowchart of a computer program adopted for this, FIG. 5 is an explanatory diagram of a conventional example. (B) ...Packing band (G1) ...First grip (F) ...Feed roller (3) ...Feed stop means (1) ...Tip detection means (2) ...・Initial grip control device (4)...Tightening control means (5)...Pullback control means

Claims (1)

[Claims] The packing band (B) is sent around the outer circumference of the object to be packed according to the packing operation signal, and then the first grip (
G_1) is a packaging machine that performs a tightening operation after completing a gripping operation, and is equipped with a feed roller (F) for the feeding operation and tightening operation, and the feed roller (F) performs a tightening operation after the feeding operation is completed. In the packing machine, the degree of tightening of the packing band (8) is adjusted by adjusting the tightening operation time of the packing band (8), and the feeding operation of the feed roller (F) is stopped at the end of the feeding operation of the packing band (B). A feed stop means (3) is provided, and a tip detection means is provided near the first grip (G_1) to detect when the tip of the packing band (B) passes through the first grip (G_1) and reaches the proper position. (
1), and causes the first grip (G_1) to perform a gripping operation when the tip detection device (1) detects the tip of the packing band (B) after the feed stop device (3) is activated. (2), and includes a tightening control means (4) for starting the tightening operation of the feed roller (F) after the completion of the gripping operation and controlling the tightening operation time, and the tip detecting means (1) is configured to detect the packing band ( B)
A pull-back control means (5) that limits the tightening operation time of the feed roller (F) to an extremely short time based on the output when the tip of the feed roller (F) is not detected, and a pull-back control means (5) that continuously or A band feeding device for a packaging machine, comprising means (6) for restarting the feeding operation of a feed roller (F) by a specific operation.