JPH03111220A - Band packing machine - Google Patents

Abstract

PURPOSE:To make it possible to keep the band storage quantity in a band storage chamber constant by a method wherein the band quantity which is used for packing work and the band quantity which is replenished in the band storage chamber are judged by the length of band as the reference. CONSTITUTION:The title packing machine is equipped with a band guide frame 3 to feed a packing band A which is pulled out from a band storage chamber 4. At the time of packing work when the packing band A is wound around a packed object B, the packing band A which has been fed to the band guide frame 3 is pulled back to the band storage chamber 4 side, and at the same time, a new packing band A is replenished to the band storage chamber 4 when a packing work has been performed. At this stage, the output of a subtracting circuit 61 which shows the used length of the packing band A and the output of a replenishing length measuring unit 5 which measured the length of a new packing band A to be replenished to the band storage chamber 4 are compared by a comparison circuit 62. Then, until the output of the subtracting circuit 61 and the output of the replenishing length measuring unit 5 have become the same, and a band replenishing stop signal is output from the comparison circuit 62, the band replenishing operation to the band storage chamber 4 is continued. By this method, the band storage quantity in the band storage chamber 4 can be kept constant.

Description

[Detailed Description of the Invention] [Industrial Field of Application and Summary of the Invention] The present invention relates to a band packing machine, and relates to a band packing machine that changes the amount of bands stored in a band storage chamber that temporarily stores bands before packing. This is to reduce the

[Prior Art and Problems] A packaging machine having an arch-shaped band guide frame erected on the top plate of a base is disclosed in, for example, Japanese Utility Model Application Publication No. 82-139904.

This has a structure as shown in Figure 7, with an arch-shaped band guide frame (3) erected on the top surface of the base (1).
A band loading device (40) having a function of supplying a band to the band entrance (31) is disposed upstream of the band entrance (31) of the band guide frame (3). and a reel (2) on the upstream side of the band loading device (40).
The packing band (A) fed out from the band is supplied to the band guide frame (3) via the band loading device (40).

The above band loading equipment! The band storage chamber (4) constituting the t (40) is composed of a flat box, and a band outlet (41) and a band insertion port (42) are provided at the top and bottom of the box.
) is formed, and a feed roller (7) corresponds to the downstream side of the band delivery port (41).

Further, a feed roller (43) is disposed opposite to the other band insertion opening (42) on the upstream side.

The band storage chamber (4) includes the band outlet (41).
A guide tube (80) is provided that connects the band insertion opening (42) and can swing around its lower end. A weight detection switch (44) is located at the bottom of the band storage chamber (4).
) is provided, and when the guide tube (80) falls horizontally, the weight of the guide tube (80) is detected by the weight detection switch (44).

In this device, before the packing operation, the packing band (A) pulled out from the reel (2) is stored for a certain amount in the band storage chamber (4), and the packing band (A) is
The leading end of the band exits from the outlet (41) of the band storage chamber (4) and is held by the feed roller (7).

Now, in the above state, the object to be packed (B) is placed on the base (1).
When the packing switch (not shown) is placed and the packing switch (not shown) is turned on, the feed roller (7) rotates and the packing band (A) is fed into the band guide frame (3). Then, when the packaging band (A) goes around inside the band guide frame (3) and its tip comes into contact with the band detection switch (82) disposed near the end of the band guide frame (3), The grip (83) is operated by the ON signal of the band detection switch (82), and the packing band (A) is activated by the grip (83).
The tip of the is held.

Further, when an ON signal is output from the band detection switch (82), the feed roller (7) is reversed by the signal to start the band retracting operation, and the packing band (A
) escapes from the band guide frame (3) and the packaged object (B)
It will be wound around. Thereafter, the overlapping portion of the wrapped packing band (A) is thermally welded to the object to be packed (B) using a heater (H), thereby completing the packing operation.

In this device, when the packing band (A) is used and the amount of bands stored in the band storage chamber (4) decreases, a weight detection switch (40) detects the total weight of the storage bands in the band storage chamber (4). becomes OFF.Then, the feed roller (
43) rotates at low speed, thereby creating a new packing band (
A) is pulled out from the reel (2) and placed in the band storage chamber (
4) When the amount of band stored in the band storage chamber (4) reaches the initial state before use of the band, the weight is detected and the weight detection switch (40 outputs an ON signal).
This signal causes the feed roller (43) to engage.

In this way, in the above conventional method, when the packing band (A) is used during packing, a new packing band (A) is replenished into the band storage chamber (0) at a low speed, and the band storage chamber (0 is always filled with a new packing band (A)). The amount of packing band (A) stored is kept constant.This allows the feed roller (7) to rotate at high speed.
) directly pulls out the packaging band (A) from the reel (2) to prevent the inconvenience of applying impact force to the reel (2).

However, in the above-described conventional method, a certain amount of packing band (A) is stored in the band storage chamber (0) by detecting the weight of the tape stored in the band storage chamber (4). When the roller (7) is reversely rotated at high speed and the packing band (A) in the band guide frame (3) is pulled back into the band storage chamber (0) at high speed, the band storage chamber (0
The packing bands (A) that are pulled back are intertwined and densely packed inside the band storage chamber (4), which is a flat box, and may become clogged in the upper part of the band storage chamber (0).

Then, the weight of the packing bands (A) concentrated in the upper part of the band storage chamber (0) will not be detected by the weight detection switch (44) disposed at the lower part of the band storage chamber (0. In the above conventional method, if the pulled-back packing bands (A) become entangled and become crowded at the top of the band storage chamber (0), the amount of bands stored in the band storage chamber (4) becomes inconsistent. There was a problem.

In particular, in the conventional device described above, the weight of the lightweight packing band (A) is detected by the 1 weight detection switch (40), so it is difficult to reduce the band storage amount in the band storage chamber (0). If a large amount of packing bands (A) are stored in the storage chamber (0),
In particular, band clogging in the band storage chamber (4) is likely to occur, and the amount of band storage in the band storage chamber (4) is not constant.

The present invention has been made in view of the above points.

It is equipped with a band storage chamber (0) and a band guide frame (3) that supplies the packing band (A) pulled out from the band storage chamber (0), and winds the packing band (A) around the object to be packed (B). During packing work, the packing band (A) supplied to the band guide frame (3) is pulled back to the band storage chamber (0 side), and when packing work is performed, a new packing band (A) is pulled back to the band storage chamber (0 side). In the storage chamber (a band packing machine designed to maintain a predetermined amount of 0 storage bands), the amount of bands used in packing work and the amount of bands to be refilled in the band storage chamber (4) are calculated based on the length of the band. As a result, even if the tangled packaging bands (A) become crowded in the band storage chamber (0), the band storage chamber (0) The challenge is to keep the amount of storage constant.

[Means] The technical means of the present invention for solving the above problems will be described with reference to the conceptual diagram shown in FIG.

The technical means of the present invention includes a replenishment length measuring means (5) for measuring the replenishment length of the packing band (A) to be newly replenished into the r-band reservoir (4), A drawer length setting device (6) for setting the length of the packing band (A) to be supplied to the band guide frame (3) side and a packing band (A).
) around the object to be packaged CB).
3) Packing band (A) pulled back from the band storage chamber (0 side)
a pull-back length measuring means (8) for measuring the length of the pull-out length measuring means (8); and a subtraction operation for calculating the length of the band in use by subtracting the output of the pull-back length measuring means (8) from the output of the pull-out length setting device (8). Compare the output of the circuit (81) and the subtraction circuit (81) with the output of the replenishment length measuring means (5) for measuring the length of band replenishment into the band storage chamber (4), and the re-outputs become equal. A comparator circuit (82) is provided which outputs a band replenishment stop signal at certain times, and the band replenishment operation to the band storage chamber (0) is continued until the band replenishment stop signal is output from the comparator circuit (62). .

[Effect] The above technical means works as follows.

Pack the band guide frame (
3) When the packing band (A) is completely supplied into the band guide frame (3), the band pull-back operation starts from the band guide frame (3) toward the band storage chamber (0, and the packing band (A) in the band guide frame (3) escapes and wraps around the packaged item (B).

Then, the length of the pulled back packing band (A) is measured by the pulled back length measuring means (8). In addition, the output of the pull-back length measuring means (8) and the pull-out length setting device (in which the length of the packing band (A) to be supplied from the band storage chamber (0 to the band guide frame (3) side) is set. 8), that is, the used length of the packing band (A) is calculated by the subtraction circuit (81).

Then, the output of the subtraction circuit (81) shown in "1", which indicates the used length of the packing band (A), and the replenishment length that measures the length of the new packing band (A) to be replenished into the band storage chamber (4). The outputs of the measuring means (5) are compared by a comparison circuit (62).

After that, the subtraction circuit (B1) and the replenishment length measuring means (5)
The band replenishment operation to the band storage chamber (4) continues until the outputs become equal and a band replenishment stop signal is output from the comparator circuit (82). The band (A) is in the band storage chamber (4
) is replenished, and the band storage amount in the band storage chamber (0) is kept constant.

[effect] The present invention has the following unique effects.

Since we refilled the band storage chamber (4) with new packing bands (A) equal to the length of the packing bands (A) used in the packing operation, the storage room (4)
The packing band (A) is pulled back into the band storage chamber (4).
) Even if the band becomes entangled and becomes clogged within the band storage chamber (4), the stitching of the band storage in the band storage chamber (4) remains constant.

[Examples] Next, the embodiments of the present invention described above will be described in detail with reference to the drawings.

As shown in FIG. 2, the packaging machine of this embodiment includes a band detection switch (82) disposed near the end of the band guide frame (3), and a band detection switch (82) disposed near the end of the band guide frame (3). The configuration is almost the same as the conventional one described above except that it does not include the detection switch (44), and a band sensor ( 23) is provided.

Next, a control circuit for controlling the packaging machine according to the embodiment of the present invention will be explained.

As shown in Figure 3, the output of the packaging switch (11) shown at the left end of the figure is from the first flip-flop (hereinafter referred to as the first flip-flop).
(abbreviated as FF) (12), and
The output of the MIFF (12) is applied to the first transistor (14) via the first OR circuit (13). In addition, the other input terminal of the first OR circuit (13) is connected to a signal from a second flip-flop (hereinafter abbreviated as 2nd FF) (+5), which will be described later, which outputs a signal during preparation work before packaging work, and L An output part of a first AND circuit (46) to which an inverted signal from a band sensor (23) disposed downstream of the band storage chamber (0 and feed roller) is connected is connected.

Then, the output of the first OR circuit (13) is 0N-OF.
A first relay (16) is inserted in the collector circuit of the first transistor (14) that
The output contact (181) of 6) functions as a first motor (17) (7)*It switch that drives the feed roller (7).

Next, the rotation of the feed roller (7) is detected by a first pulse generator (71), and the first pulse generator (71) is configured such that the feed roller (7) rotates at a certain angle. The first pulse generator (71) generates a pulse every time it rotates, and outputs an up or down signal depending on whether the feed roller (7) is forward or reverse, and these signals are sent to an UP/DOWN counter ( 74).

Incidentally, the forward and reverse movements of the feed roller (7) are detected as shown in FIGS. 4 to 6.

As shown in Fig. 4, a rotary disk (72) is installed coaxially with the feed roller (7) and has a notch (7o), and a rotary disk (72) is disposed on both sides of the rotary disk (72). 1st of group
．． Second photoelectric switches (18) and (19) are provided, and the outputs of the first and second photoelectric switches (18) and (18) have different phases depending on the direction of one rotation, as shown in the time chart of FIG. Make the signal available. Then, the pulses for each rotation direction taken out above are shown in FIG.
．． When applied to the second D flip-flops (85) and (se), the outputs of each section become as shown in the time chart, and thereby pulses Za and Zb can be extracted for each direction of rotation.

Next, the output of the above-described UP/DOWN counter (74) is used to store a signal indicating the distance from the feed roller (7) to the end of the band guide frame (3). The output of the second comparator (6)
3) is applied.

Furthermore, the output of the second comparator (63) is applied to a set input terminal of a fourth flip-flop (hereinafter abbreviated as the fourth FF) (84) that turns on and off the second transistor (86). . In addition, the 2 transistors listed in the north (6
The collector circuit of B) has the first one for the feed roller (7).
A second relay (65) is inserted to rotate the motor (17) in forward and reverse directions.

Then, the first relay (65) described in h. The second normally closed output contacts (fi51) and (852) are inserted in series with the high potential side and low potential side of the first motor (17) for the feed roller (7), and are further inserted in series with the first motor (17) for the feed roller (7). The first normally open output contact (853) of the second relay (65) is connected to the first normally open contact (853) of the second relay (65).
The higher potential side of the normally closed output contact (651) and the first moke (
17) is inserted in a circuit that bypasses the low potential side of the circuit. Also 1. 2nd normally open output contact of the 2nd relay (85) (
654) is inserted into a circuit that is grounded via a voltage conversion resistor (67) between the first motor (17) and the first normally closed output contact (851) shown above.

Next, - the output on the high potential side of the voltage conversion resistor (87) is compared with the reference voltage (68) by a fourth comparator (68); The output is applied to the set input terminal of the third F F (78). The output of the third F F (78) is sent to a second flip-flop which stores the input signal of the preparation switch (51) which is input when saving the packing band (A) to the band loading device (40). (hereinafter abbreviated as 2nd FF) Along with the output signal of (15), the 2nd OR circuit (
52) and the second OR circuit (
52) is applied to the third transistor (54), and the collector circuit of the third transistor (54) is connected to the second motor 1 (45) t-ON for the feed roller (43).
- A third relay (53) to turn off is inserted.

Next, the rotation of the feed roller (43) that feeds the packing band (A) into the band storage chamber (4) is controlled by a second pulse generator (55).
), and the second pulse generator (55) outputs a pulse every time the feed roller (43) rotates by a certain angle, and the number of pulses is detected by the UP counter ( 77). Therefore, the length of the band supplied to the band storage chamber (4) by the feed roller (43) can be determined from the output of the UP counter (77).

The above UP shows the band length supplied to the band storage chamber (0)
The output of the counter (77) is applied to the first comparator (76) together with the output of the register (47) that stores the output of the UP/DOWN counter (74) mentioned above.
The comparator (76) outputs a band replenishment stop signal when the outputs of the UP counter (?7) and the register (47) match, and this signal is applied to the reset input terminal of the third FFF (78). It has become so. The first comparator (78) corresponds to the comparison circuit (82) described in the technical means section.

In addition, the output of the above-mentioned UP counter (77) is the packing band (A) that needs to be stored in the band storage chamber (4).
The voltage is applied to a third comparator (5G) together with a band oil storage amount setter (98) that stores the length of the third comparator (5G).
G) outputs an rHJ signal when the output of the former becomes greater than that of the latter, and this signal causes the readiness switch (51) to
The input signal is applied to the reset input terminal of the second F F (15) that stores the input signal. In the case of this embodiment, the E band storage amount setting device (98) has a distance slightly greater than the distance from the feed roller (43) to the end of the band guide frame (3) via the feed roller (7). A signal indicating a long distance (for example, about 2 m) is stored.

Furthermore, the output of the fourth comparator (θ8), which is used to monitor the voltage that fluctuates depending on the torque generated by the first motor (17) for the feed roller (7), is outputted via the delay circuit (57). is applied to the reset input terminal of M4FF (θ4).

Next, we will explain the operation of the packaging machine in Example F before packaging. Fi@
The explanation will be divided into work and actual packing work.

(Regarding the preparation work) First, by holding and lifting a handle (not shown) fixed to the guide tube (80), the guide tube (80) is
The horizontal shaft (81) is used as a fulcrum to swing and stand up (shape 8 shown by the imaginary line in Fig. 2), and in this state, turn on the preparation switch (51), and at the same time pull out the packing band (A) from the reel (2). ) is inserted into the feed roller (43), then the input signal of the preparation switch 2,000 (51) is sent to the third OR circuit (5
8) to the reset terminal of the UP counter (77), thereby resetting the UP counter (77). Further, the input signal of the preparation switch (51) is stored in the second F F (+5), and the output of the second F F (15) is transmitted to the band disposed adjacent to the downstream side of the feed roller (7). It is applied to the first AND circuit (48) together with a negative signal (“H” signal) of the sensor (23) (which does not output an “H” signal as a pan detection signal), and furthermore, the output of the first LAND circuit (46) is applied to the first AND circuit (48). 1st O
The voltage is applied to the first transistor (14) through the R circuit (13), turning the first transistor (14) on, thereby energizing the first relay (16). Then, the output contact (161) of the first relay (16)
closes and the first motor (17) starts to stop rotating. That is, the feed roller (7) begins to rotate normally.

On the other hand, the input signal of the preparation switch (51) is memorized and the tail second F F (15)(') output is applied to the third transistor (54) via the second OR circuit (52), thereby The third transistor (54) is turned on and the third relay (53) is energized.

Then, the output contact (531) of the third relay (53) is closed and the second motor (45) begins to rotate at a low speed, thereby causing the feed roller (43) to rotate. Then, the guide cylinder (80
), the packing band (A) is fed toward the feed roller (7) on the downstream side thereof.

When the packaging band (A) fed toward the feed roller (7) reaches the band sensor (23) and an rHJ signal is output from the band sensor (23), an "L" signal is output as the inverted signal. is applied to the WSIAND circuit (4B), and the first AND circuit (46) also outputs an "L" signal. Then.

The first transistor (14) returns to the OFF state and the first
The output contact (181) of the relay (16) is opened, thereby stopping the first motor (17). That is, the tip of the packing band (A) is held between the feed rollers (7).

Then, after that, the guide tube (80) is folded down to position B (second position).
(state shown by the solid line in the figure).

Even after the packing band (A) is held by the feed roller (7), the feed roller (43) continues to rotate, thereby storing the packing band (A) in the band storage chamber (4). The amount of storage increases as the band storage chamber (4) starts, and the amount of rotation of the feed roller (43), that is, the amount indicating the length of the packing band (A) fed into the band storage chamber (4), increases as the second
It is monitored by a pulse generator (55) and an UP counter (77).

Then, the packing band (
A) The output of the UP counter (77) indicating the length and the band storage setting device (98) (from the feed roller (43) to the end of the band guide frame (3) via the feed roller (7) A third comparator (58) compares the outputs of the signals that are received at a distance slightly longer than the distance reached by the third comparator (58).
Continuous rotation of the feed roller (43) causes the band storage chamber (
4) The band storage amount is set by the above band storage setting device (θ8).
When the hend storage limit stored in is exceeded, the third comparator (5
An "H" signal is output from B) to reset the second F F (15). This allows the third transistor (
54) is turned off, the third relay (53) is deenergized, and as a result, the second motor (45) that rotates the feed roller (43) is stopped and the packing band is placed in the band storage chamber (4). The operation of storing (A) is completed. This completes the preparation work before the packing work.

(Regarding actual packing work) Next, place the object to be packed (B) on the h side of the base (1) and turn on the packing switch (11).
) UP/DOWN counter (74) that stores the rotation amount of
is reset, and 1lFF (12) is set by the input signal of the packaging switch (11).

When the first F F (12) is set, the first
The signal F F (12) is applied to the first transistor (14) via the first OR circuit (13) and the first relay (16) is energized to close its output contact (181). Then, a current flows from the output contact (181) to the first normally open output contact (851) to the first motor (17) to the second normally open output contact (852), causing the first motor (17) to rotate normally. Along with this, the feed roller (7) also rotates in the normal direction.

When the feed roller (7) starts to rotate normally, the first pulse generator (
71) will generate an up signal, and the number of signals will be expressed as U
The P/DOWN counter (74) counts up, thereby measuring the length of the packing band (A) supplied to the band guide frame (3).

Packing band (A) being fed to the band guide frame (3)
The signal of the UP/DOWN counter (74) indicating the length of is applied to the second comparator (63), which determines the length from the feed roller (7) to the end of the band guide frame (3). (hereinafter referred to as the required length of band supply) and the output of the drawer length setting device (8) and the band guide frame (3).
) indicates the length of the packing band (A) supplied to P/
The outputs of the DOWN counters (74) begin to be compared.

, when the length of the packing band (A) supplied to the band guide frame (3) exceeds the required band supply length stored in the drawer length setting device (8), the band guide frame (3) )
When it is determined that the packing band (A) has reached the end of M 4 F, a signal is output from the second comparator (63)
F (84) is set and the second transistor (6e) is turned on. or.

A circuit (not shown) operates to cause the grip (83) to clamp the tip of the packing band (A).

When the second transistor (6B) is turned on, the second relay (85) inserted into its collector circuit is energized, thereby causing the first... Second normally closed output contact (f151
), (852) open, and the first . The second normally open output contacts (f153) and (654) will close. Then, the first normally open output contact (853) - the first motor (1?
), voltage conversion resistor (87) → second normally open output contact (854
), the first motor (17) rotates in reverse, and in conjunction with this, the feed roller (7) starts to pull back the band. Then, the down signal output from the first pulse generator (71) during the band pullback is applied to the down input terminal of the UP/DOWN counter (74), thereby
The UP/DOWN counter (74) performs a countdown operation depending on the number of down signals output from the first pulse generator (71). ) begins to measure the distance of the pulled back packing band (A), and the value of the UP/DOWN counter (70) decreases according to the measured distance. ) when the packing band (A) has finished winding, a signal indicating the length of the packing band (A) used in the packing operation goes up.
/DOWN counter (74) outputs the state.

In this embodiment, a feed roller (71) that rotates in the opposite direction to pull back the band, and a first pulse generator (71) that outputs a number of down signals corresponding to the number of rotations of the feed roller (7). and U counts this down signal.
The P/DOWN counter (74) corresponds to the pullback length measuring means (8) described in the technical means section. or,
In the above embodiment, the component that performs the countdown function included in the UP/DOWN counter (74) corresponds to the subtraction circuit (61) described in the technical means described above.

Also, when the feed roller (7) starts pulling back the band, the band in the band guide frame (3)
The packing band (A) which has been wound up and pulled back to the upstream side by the above-mentioned pulling back operation is stored in the band storage chamber (4).

When the packing hand (A) finishes winding the object to be packed (B) by the band pulling back operation of the F roller (7),
The packing band (A) wound around the object to be packed (B) is then tightened by the band pulling back operation of the feed roller (7), so that the packing band (A) wraps around the object to be packed (B). It will be tightly wrapped around. Then, when the torque of the first motor (17) generated by the band tightening operation by the feed roller (7) increases, the first motor (17) rises as the torque increases.
The current flowing through is converted into a voltage by the voltage conversion resistor (67), and this is applied to the fourth comparator (S8). Also, at this time, the heater (H) works and the packing band (
Weld the polymerized part of A).

Further, a cutter (not shown) works to cut the packing band (A).

Then, when it is detected that the comparison voltage of the fourth comparator (69) described in L becomes larger than the reference voltage (68) and the torque generated by the first motor (17) exceeds a certain level, the fourth comparator ( The rHJ signal is output from 69) and is applied to the reset terminal of the UP counter (77) via the third OR circuit (5th), thereby resetting the UP counter (77). In addition, the gate (75) is opened by the signal output from the fourth comparator (69), and as a result, the signal indicating the length of the packing band (A) used in the packing operation of the above-mentioned time is UP. /DOWN counter (74) is stored in the register (47).

Also, by tightening the packing band (A), the first motor (1
7) increases, and the fourth comparator (88)
When the HJ signal is output, the third F F (7
8) is set, which causes the third transistor (5
4) turns on. Then, the third transistor (5
The third relay (53) inserted into the collector circuit of 4) is energized, its output contact (531) closes, and the second motor (45) begins to rotate. That is, the feeding roller (43) begins to rotate and the replenishment of the packing band (A) from the reel (2) to the band storage chamber (4) begins.

When a new packing band (A) pulled out from the reel (2) begins to accumulate in the band storage chamber (4), the packing band (A)
The length of is measured by a second pulse generator (55) that outputs a number of pulses proportional to the amount of rotation of the feed roller (43) and an UP counter (77) that counts the pulses, and the measured value is The voltage is applied to the first comparator (78), thereby causing the register (47) to store the band usage amount (the length of the packing band (A) used in - times of packing operations) and the band storage chamber ( 4), the amount of newly replenished packing bands (A) begins to be compared. And when these re-outputs match,
Then replace the new packing band (A) with the same length as that used for packing.
) is replenished in the band storage chamber (4), it outputs the rHJ signal as a band replenishment stop signal.Then, the third FF (78) is reset by this signal, and the third transistor (54) is thereby reset. At the same time as returning to the OFF state, the third relay (53) inserted into the collector circuit of the third transistor (54) is deenergized and the output contact (531) opens, that is, the second motor (45) stops. When the band replenishment operation to the band storage chamber (4) is stopped,
This completes the packing operation.

In this embodiment, the L feed roller (43),
A second pulse generator (55) that outputs a number of pulses according to the amount of rotation, and an UP counter (77) that counts the number of pulses of the second pulse generator (55) are included in the technical means described above. This corresponds to the replenishment length measuring means (5) described in .

In the above embodiment, the rotational speed of the feed roller (7) and the feed roller (43) was checked using a photoelectric switch disposed near them, but these rollers (7),
(43) as a driving source. Second motor (17)
, (45) may be configured with a pulse motor, for example, and the number of puffs sent to the pulse motor may be used to determine the rotational speed of the feed roller (7) and the feed roller (43).

Furthermore, in the embodiment E, there is a reference length setting device (6) that stores the band length to be supplied to the band guide frame (3), and an UP that indicates the band length that is actually supplied to the band guide frame (3). /
The band supply operation is stopped by comparing the signals of the DOWN counter (74), but the pulses generated from the first pulse generator (7t) connected to the feed roller (7) are used to stop the band supply operation. Alternatively, a preset counter preset by the device may be caused to count down, and the operation of supplying the band to the band guide frame (3) may be stopped by the "O" output of this counter.

Furthermore, in the embodiment described in G, the amount of bands to be stored in the band storage chamber (4) in E is determined only by measuring the length of the packing band (A) supplied to the band storage chamber (4). I tried to do that.

As shown by the imaginary line in Figure 2, ;R of the packing band (A)
Fj) A weight measuring device (44) for measuring t is provided, and the weight %
[If it is determined from the output of the regulator (44) that the band storage level in the band storage chamber (4) has exceeded a certain level, the band storage operation may be stopped. In this case, even if an error occurs in the length measurement of the packing band (A) supplied to the band storage chamber (4) and this error is accumulated, the packing band (A) is supplied to the band storage chamber (4). There is no inconvenience such as filling up and getting clogged.

[Brief explanation of drawings]

Fig. 1 is a conceptual diagram of the present invention, Fig. 2 is a schematic explanatory diagram of a packing machine according to an embodiment of the present invention, Fig. 3 is an explanatory diagram of its control circuit, and Figs. 4 to 6 are illustrations of the feed roller (7). The WSq diagram, which is an explanatory diagram of the configuration for detecting forward and reverse rotation, is an explanatory diagram of a conventional example. Measuring means (6)...Drawer length setter (7)...Feed roller (8)...Return length measuring means (43)...Middle feed roller (81)...Subtraction circuit ( 62) φ/number comparison circuit (A)...Packing band (B) ・Packaged item

Claims (1)

[Claims] A band storage chamber (4) and a band guide frame (3) for supplying the packing band (A) pulled out from the band storage chamber (4).
During packing work in which the packing band (A) is wound around the object to be packed (B), the packing band (A) supplied to the band guide frame (3) is pulled back to the band storage chamber (4) side, and at the same time , when packing is performed, a new packing band (A
) in a band storage chamber (4) to keep the number of bands stored in the storage chamber (4) at a predetermined amount.
A) replenishment length measuring means (5) for measuring the replenishment length;
A drawer length setting device (6) that sets the length of the packing band (A) pulled out from the band storage chamber (4) and supplied to the band guide frame (3) side, and B)
a pull-back length measuring means (8) for measuring the length of the packing band (A) that is pulled back from the band guide frame (3) to the band storage chamber (4) side when wrapping and packing; and the above-mentioned drawer length setting. vessel(
a subtraction circuit (61) that calculates the band usage length by subtracting the output of the pullback length measuring means (8) from the output of step 6);
The output of the subtraction circuit (61) is compared with the output of the replenishment length measuring means (5) for measuring the length of replenishment of the band to the band storage chamber (4), and when both outputs become equal, the replenishment of the band is performed. A comparison circuit (62) that outputs a stop signal is provided, and the comparison circuit (62)
The band packing machine continues the band replenishment operation to the band storage chamber (4) until a band replenishment stop signal is issued from 62).