JPH0767929B2 - Stretch wrapping equipment - Google Patents

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stretch wrapping machine, and more particularly to a stretch wrapping machine which gives a film a predetermined tensile strength when a stretch film is cut. [Prior Art] Conventionally, in a stretch wrapping machine that wraps an article using a stretch film, the film transfer unit and the film supply unit are driven, and the film is unwound from a film roll, and the unwound film has a predetermined length. When
The drive of both the devices is stopped. Then, in this state, a cutter having a tooth whose tip is formed in a sawtooth shape is operated to make a perforation in the film. After that, when the film transfer section and the film supply section are driven again, the film is further fed out, and only the film supply section is reached when the leading edge of the next film (the portion where the perforation is formed) reaches the carry-in end of the film transfer section. Stop driving.
This cuts the film from the perforations. When the cut film reaches the film folding position (packing position) of the packaging device, the driving of the film transport unit is stopped. Since the film supply unit is driven only when the film transfer unit is driven as described above, in the conventional stretch packaging device, the film transfer unit is provided with a brake.
It is driven by a phase motor, and the film supply section receives power from the rotating section of the film transport section through slip cracks. The film supply unit is stopped by operating a brake provided on the rotating unit of the film supply unit (see Japanese Patent Laid-Open No. 64-23907). [Problems to be solved by the invention] When the cutter is driven, the amount of perforations formed in the film (the amount of piercing of the sawtooth blade penetrating the film) is determined by the tension of the film when driving the cutter. Made up. That is, when the tension is strong, the perforation amount is large, and when the tension is weak, the perforation amount is small. Therefore, by keeping the tension state constant, it is possible to always insert the same amount of perforations. If the amount of perforations formed on the film is small, there is a risk that the film will fail to be cut, and even if it does not fail, the cuts will be jagged or ripped, and the packaging It affects the finish.
Furthermore, when the amount of perforations is small, when pulling the film and cutting the film at the perforations, a strong pulling force is applied to the film on the film supply side (next film), which causes the next film to become extra. It may be pulled out. Further, when the perforation amount is large, in extreme cases, there is a problem that the film is cut when the cutter is driven. Further, since the above-mentioned packaging device pulls the perforated film and cuts the film at the perforated portion, the tension applied to the film changes depending on the amount of perforations, and this tension becomes the tensile strength after packaging. Because it will affect
The amount of perforations formed when the cutter is driven needs to be within a certain range determined by the type of film. That is, since the amount of perforations formed on the film is determined to be an optimum value depending on the characteristics of the film used, it is necessary to set the amount of perforations within a certain range depending on the type of film. As described above, the tension of the film when the cutter is driven can be different due to the time difference between the timing at which the film supply unit stops and the timing at which the film transport unit stops. That is, the tension applied to the film becomes stronger as the film transport unit is driven for a longer time after the driving of the film supply unit is stopped. Therefore, the motor and the brake may be operated so that the time difference becomes constant. However, in the conventional stretch packaging device,
Even if the motor and the brake are driven so that the time difference becomes constant, the amount of perforations varies among individual packaging devices. This is because the above-mentioned three-phase motor with a brake has a variation in the delay time from when the brake is driven to when the rotation of the motor is stopped, which varies depending on the individual motor. Therefore, conventionally, the attachment position of the cutter is adjusted in order to keep the amount of perforations formed on the film constant. However, there is a problem in that the adjustment of the attachment position of the cutter is troublesome and the work is difficult to perform due to the structure of the packaging device. Further, it is necessary to have knowledge as to how much the mounting position is moved and how much the perforation amount changes, and there is also a problem that experience is required for adjustment. The present invention has been made in view of the above points, and provides a stretch wrapping apparatus including a control means capable of adjusting the amount of perforations formed on a film without adjusting the mechanical attachment position of the cutter. With the goal. [Means for Solving the Problems] In order to solve the above problems, the present invention transfers a film fed from a film supply unit by a film transfer unit, and when the amount of delivery reaches a predetermined length, the film transfer unit And the film supply unit are stopped at a predetermined timing, and tension is applied to the film existing between the rear end of the film transfer unit and the front end of the film supply unit, and the rear end of the film transfer unit and the front end of the film supply unit. By operating a cutter having a saw blade arranged between and, by making a perforation in the film, then holding the back side of the perforation of the film with the film holding part, and by transferring the front side with the film transfer part The film is separated from the perforation, and the separated film is configured to be transferred to a film folding position, and the film transfer unit is provided with a brake-equipped model. In the stretch wrapping device, the film supply unit is driven by a motor and the driving force is stopped from the film transfer unit through a clutch, and the brake is operated to stop the operation. Depending on the delay time from the transmission of the stop signal of the attached motor to the actual operation of the motor when the brake operates, the transmission timing of the drive signal supplied to the brake of the film supply section when the delay time is long. When the delay time is short, the time difference between the timing at which the film supply unit stops and the timing at which the film transfer unit stops by advancing the timing of sending a drive signal to the brake of the film supply unit is within a predetermined range. It is characterized in that a control means for adjusting so as to be inside is provided. Further, when the delay time is long, the timing of sending the stop signal of the brake motor of the film transfer unit is advanced, and when the delay time is short, the timing of sending the stop signal of the brake motor of the film transfer unit is set. It is characterized in that control means is provided for adjusting the time difference between the timing at which the film supply section stops and the timing at which the film transport section stops by being delayed so as to fall within a predetermined range. Further, the apparatus itself measures the delay time and determines the timing of sending a drive signal to be supplied to the brake of the film supply section or the timing of sending a stop signal of the motor with a brake of the film transfer section based on the measurement result. It is characterized by Further, the delay time is measured periodically during the operation of the stretch wrapping device.

[Action]

By providing the stretch wrapping apparatus with the control means as described above, the time difference between the timing at which the film supply unit stops and the timing at which the film transport unit stops can be within a predetermined range. Even when the time from the sending of the stop signal to the actual stop of the motor varies depending on the motor, the tension applied to the film can be made constant when perforating the film. Therefore, it is possible to keep the amount of perforations in the film constant. [Embodiment] An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a schematic configuration of a film transfer mechanism of the packaging apparatus of the present invention. As shown in the figure, the film transfer mechanism includes a film supply unit 100, a film transfer unit 200, and a film cutting unit 300. The film supply unit 100 mounts the film roll F 2
Book support rollers 101 and 102 are arranged at a predetermined interval, and a drive belt 103 is suspended on the support rollers 101. The drive belt 103 is suspended by a pulley (not shown) connected to a shaft of a timing pulley 202 described later through a clutch and a film feeding pulley 104, and the film transfer unit 2
The driving force is obtained from 00. The film transfer unit 200 includes timing pulleys 201, 2 for driving.
The flat belt 203 is suspended on 02, and the contact plate 204 is arranged on the flat belt 203. The two film transfer units 200 are arranged substantially parallel to each other. The film transfer unit 200 holds the both side portions of the film to transfer the film. A film hold portion FH is arranged between the front end of the contact plate 204 and the timing pulley 202. A motor M with a brake is directly or indirectly connected to the timing pulley 201, and a driving force is applied by the motor M. The timing pulley 201 is rotated by the activation of the motor M, and the flat belt 203, the timing pulley 202, and the drive belt 10 are rotated.
3 rotates. At the same time, since the supporting roller 101 and the film feeding pulley 104 also rotate, the film fed from the film roll F of the film supply unit 100 by this rotation is fed by the film feeding pulley 104,
Further, both sides of the film transfer unit 200 are sandwiched between the flat belt 203 and the contact plate 204 and transferred. When the film has been transferred for a predetermined length, the motor M is stopped to stop the film transfer and the film feeding pulley 104
The brake B (electromagnetic brake) provided in the above is operated to stop the rotation of the film feeding pulley 104. And
The solenoid 302 is operated and the film is perforated by the cutter 301. After that, the motor M is activated again, and when the flat belt 203 is rotated, the film is moved to a predetermined length, that is, the perforation is moved to a position where the film has passed through the hold plate 205 of the film hold unit FH.
The brake B of 4 is operated and the film feeding pulley 104
To stop the rotation of the drive belt 103. In this case, even though the drive belt 103 stops rotating, the pulley on which the drive belt 103 is suspended is connected to the timing pulley 20 via a clutch (slip clutch).
Because it is connected to the 2nd axis. The timing pulley 202 is rotatable. Therefore, the drive belt 103
Although the film is stopped, the front side of the perforation of the film is transferred and the film is separated from the perforation. The separated film is transferred to the packaging section of the packaging apparatus, that is, the folding section of the film. The detailed structure and operation of the film supply unit 100, film transfer unit 200 and film cutting unit 300 are described in Japanese Patent Application No. 62-177.
Since it is disclosed in detail in the specification and drawings of Japanese Patent Application Laid-Open No. 64-23907, the description thereof will be omitted here. In the film transfer mechanism having the above structure, when the cutter 301 having a saw blade is operated to make a perforation in the film,
Since the moving distance of the cutter 301 is constant, the amount of perforations given to the film, that is, the amount of the cutter blade sticking into the film depends on the tension of the film. That is, if the tensile strength is high, the amount of the cutter blade entering is large, and if the tension is low, the amount of entering the cutter blade is small. The tension applied to the film is determined by the time difference between the stop time of the flat belt 203 and the stop time of the film feeding pulley 104.
That is, a stop signal (drive current is turned off to the motor M with a brake)
Then, a signal for turning the brake ON) is issued, the drive current is cut off, the brake operates, and the time when the rotation of the motor M actually stops (the time when the flat belt 203 stops) and the brake B of the film feeding pulley 104 Is activated and the film tension is determined by the time difference between the times when the film feeding pulley 104 stops. In other words, depending on the time from when the film feeding pulley 104 actually stops until the flat belt 203 actually stops, the tension of the film becomes strong if this time is long and weak if it is short. Therefore, in order to keep the tension of the film at a predetermined constant value and to keep the amount of perforations inserted in the film constant, the time difference between the time when the flat belt 203 actually stops and the time when the film feeding pulley 104 actually stops is set. It may be adjusted so that it becomes constant. Supply a stop signal to the motor M with a brake (drive current
The delay time from when the motor M is actually stopped) to TM, and when the drive signal is sent to the brake B of the film feeding pulley 104 and the brake B is activated. Let TB be the delay time TM
Varies depending on the motor in the range of 50 msec to 70 msec, but the delay time TB is a constant value of about 25 msec. Assuming that the time difference between the stop timings of the film transfer unit 200 and the film supply unit 100 is T, T = T0 + TM-TB. Here, T0 is the time difference between the time when the drive signal SB is issued to the brake B and the time when the stop signal SM is issued to the motor M (this time difference T0 can give a predetermined tension to the film). Now, if TM = TM '+ ΔTM (where TM' is a constant value and ΔTM is the amount of variation), then T = (TM'-TB) + T0 + ΔTM. Therefore, in order to make the time difference T constant, T0 + ΔTM = C (constant) may be set. That is, T0 = C−ΔTM, that is, when ΔTM is positive, T0 is decreased, and when ΔTM is negative, T0
By increasing, the time difference T can be made a constant value regardless of ΔTM. There are two methods to make this T0 small or large. That is, since T0 is the time difference between the stop signal SM sent to the motor M and the drive signal SB sent to the brake B, T0 can be adjusted by adjusting the sending timing of the motor stop signal SM or the brake drive signal SB. FIG. 2 is a timing chart showing a case where the drive signal SB of the brake of the film feeding pulley 104 is adjusted to adjust the T0, and FIG. 3 is a timing chart showing the adjustment of the stop signal SM of the motor M to adjust the T0. It is a timing chart which shows a case. As shown in FIG. 2, the time TM from when the motor stop signal SM is sent to when the brake built in the motor is actuated and the motor M is actually stopped is tm ′, tm by each motor M. , tm ″, there is a time difference. Therefore, by adjusting the sending timing of the brake drive signal to be sent to the brake B of the film feeding pulley 104 as shown by t ′, t, t ″, the brake B is correspondingly adjusted. The operation timing is adjusted so that the time difference T between the stop timings of the film transport unit 200 and the film supply unit 100 is constant. Further, in FIG. 3, as shown in the figure, the timing of sending the drive signal SB of the brake B of the film feeding pulley 104 is kept constant, and after actually sending the motor stop signal SM to the motor M with a brake, Corresponding to the time difference tm ′, tm, tm ″ until the motor stops, the motor stop signal
The timing for sending the SM is adjusted to t ', t, t "to make the time difference T constant. Fig. 5 is a block diagram showing the configuration of the control device for controlling the packaging device. The control device is a CPU 60 that controls the entire packaging device, and a RAM 6 that stores various data.
1, a ROM 62 in which various programs and the like are stored, a timing adjusting unit 63 for adjusting the operation timing of each part such as driving of a brake of the film feeding pulley 104 and an operation display unit 64 as described later, and the CPU 60 has an I / O port. It is connected via 40 to an elevator mechanism drive unit 51, a package loading / unloading control unit 52, a film supply / transfer control unit 50, a folding plate drive control unit 53, and a film clamp drive control unit 54. Also, CPU6
0 is also connected to the weighing label printer 70. Since the elevator mechanism drive unit 51, the package loading / unloading control unit 52, the folding plate drive control unit 53, the film clamp drive control unit 54, and the weighing label printer 70 are not directly related to the present invention, description thereof will be omitted. FIG. 4 is a block diagram showing the configuration of the film supply / transfer control unit 50. In the figure, 207 is a timing disk directly or indirectly connected to the rotary shaft of a motor M with a brake, and 41 is an optical disk which is a slit or magnetic target such as slits provided at equal intervals on the timing disk 207. Alternatively, it is a sensor that magnetically detects. The detection output of the sensor 41 is output to the CPU 60 that controls the entire packaging device through the I / O port 40. 43 is a motor drive circuit that drives the motor M with a brake, and 44 is a solenoid drive circuit that drives the solenoid 302 that drives the cutter 301. Further, 45 is a brake drive circuit for driving the brake B (electromagnetic brake) of the film feeding pulley 104. The timing disk 207 is rotated by the rotation of the motor M, and the timing signal A (pulse signal) is generated from the timing signal generation circuit 42 by the output of the sensor 41, and is sent to the CPU 60 via the I / O port 40. The stretch wrapping device is provided with a timing signal (pulse signal) generated in synchronization with the rotation of the motor (not shown) of the elevator drive unit 51, which is the main power source of the stretch wrapping device.
Also, it is controlled to operate according to a time chart determined based on the count value of the timing signal generated in synchronization with the rotation of the film supply / transfer control unit 50. This control method based on the count value of the timing signal is described in detail in the specification of Japanese Patent Application No. 59-204743 (Japanese Patent Laid-Open No. 61-81912) previously filed by the present applicant. Omit it. The delay time TM from the transmission of the motor stop signal SM to the actual stop of the motor M can be measured by counting the timing signal A. That is, the delay time TM is measured according to the number of counts of the timing signal from when the motor stop signal SM is sent to the motor drive circuit 43 to when the motor M is actually stopped. Strictly speaking, this count value is a measurement of how long the motor M has moved from when the motor stop signal SM was sent to when the motor M actually stopped, and not the delay time TM itself. However, this count value has a functional relationship with the delay time TM and can be treated as equivalent to the delay time TM. For example, in the method of adjusting the transmission timing of the brake drive signal SB in FIG. 2, when the standard of the delay time TM of the motor M with a brake is the count value “6”,
When the measured value of delay time TM is "7", the brake drive signal
Delay the timing of sending SB by "1". That is, if the transmission timing of the brake drive signal SB that sets the time difference T to a predetermined value is the count value Cn in the case of the standard delay time "6", the brake drive is performed in the case of the delay time count value "7". The timing of transmitting the signal SB is (Cn + 1), and when the count value is "5", it is (Cn-1). As a result, the time difference T between when the film transfer unit 200 is stopped and when the film supply unit 100 is stopped
Can be set to a predetermined constant value,
It is possible to make the tension of the film constant when giving perforations with 301. The above-mentioned adjustment of the timing of sending the brake drive signal SB is performed by increasing or decreasing the count value, but it is also possible to perform the adjustment of the time count by a timer instead of the method of increasing or decreasing the count value. For example, the brake drive signal SB is configured to be sent to the brake B when the count value CN (this value is limited by the film cut length) is counted and the timer time TS of the timer has elapsed.
The timing for sending the brake drive signal SB can also be adjusted by adjusting the time count TS of this timer according to the delay time TM. Once the film cut length is determined, the film transfer unit 200
The start and stop of the motor M for driving, the drive of the brake B of the film feeding pulley 104, and the drive timing (count value) of the solenoid 302 of the cutter 301 are determined.
In the present invention, the drive timing (count value) of the brake B or the stop timing (count value) of the motor M determined by the film cut length is finely adjusted according to the delay time of the motor M to delay the motor M. It is intended to prevent the influence of variations in time. The timing adjustment unit 63 shown in FIG. 5 is provided with a timing fine adjustment switch for performing fine adjustment of the timing for each operation of the parts. One of them is a film feeding pulley 104 as shown in FIG. A rotary switch 63a is provided for adjusting the operation timing of the brake when the film is fed out, that is, the operation timing when the brake is driven before the perforation is formed by the cutter. To specifically determine the operation timing of the brake B of the film feeding pulley 104, there are a method of manually adjusting and a method of automatically determining by a packaging device. The manual adjustment method involves the following steps. (A) The optimum value of the time difference T between the time when the film transfer unit 200 is stopped and the time when the film supply unit 100 is stopped is obtained for each used film in advance by experiments. Then, this optimum time difference T is converted into the count value NS of the timing signal of the optimum delay time T of the motor. (B) Next, the delay time TM (count value) of the motor M is measured. Note that this measurement is performed by monitoring the output of the timing signal generation circuit 42. Further, it may be considered that the delay time TM (count value) of the motor M is automatically measured in the maintenance mode of the packaging device.
It is desirable to carry out the above measurement a plurality of times and take the average value. (C) The count value N obtained by the above-mentioned measurement is (a)
If it is larger than the optimum count value NS of
When a is set to the plus side and the count value is smaller than NS, the switch 63a is set to the minus side. It should be noted that, when the above adjustment is performed, it is easy to make the adjustment if an adjustment table as shown in FIG. 7 is prepared. In FIG.
A, B, C, D are the film types, CN is the measurement count value, −4,
-3, -2, -1, 0, +1, +2, +3, +4 indicate the scale of the switch 63a. The method of automatically adjusting with the packaging device is as follows. FIG. 8 is a flowchart showing the flow of automatic adjustment processing. First, as shown in FIG. 7, a table of adjustment values for film types A, B, C, D and measurement count value CN is shown in FIG.
Store in ROM62 or RAM61. Enter the film type (step ST1). Subsequently, the motor is driven for a certain period of time, and when the certain period of time has elapsed, the motor is stopped (step ST2). At this time, the delay time TM from when the motor stop signal is sent to when the motor M is actually stopped is measured (count of the timing signal output from the timing generation circuit 42) (step ST3). ROM62 or RAM61
The adjustment value is determined using the adjustment value table stored in (step ST4). This adjustment value is stored in the register of the RAM 61 (step ST5), and thereafter the brake operation timing is adjusted based on this adjustment value. FIG. 9 is a flowchart showing another example of the automatic adjustment processing. First, the packaging device is driven for one packaging cycle to perform a normal packaging operation (step ST11). During the driving of one packaging cycle, the delay time TM from when the stop signal SM is sent to the motor M with a brake to when the motor is actually stopped is measured. Next, the measured delay time TM is compared with the stored delay time TM ′ (step ST12), and the delay time
If there is a change in TM, a new delay time TM is stored (step ST13), and then the adjustment value of the transmission timing of the brake drive signal for this delay time is determined (step ST14). This adjustment value is stored, and thereafter, the brake drive signal is sent at the timing adjusted by this adjustment value (step ST15). That is, in this process, the delay time of the motor M is regularly measured during the packaging operation of the packaging device. Monitor whether the delay time TM has changed, and if so,
The transmission timing of the brake drive signal is adjusted based on the changed delay time. Needless to say, the configuration of each part of the packaging device, which is not related to the gist of the present invention, is not limited to the above embodiment.
For example, there is no particular limitation on the structure of the film folding unit of the packaging device, the structure of the film transport unit 200 that holds the film, and the like. That is, the present invention relates to supply and transfer of a film in a stretch wrapping apparatus, in which the film transfer unit is driven by a motor with a brake, and the film supply unit receives power from the film transfer unit via a clutch and stops its operation by the brake. Any packaging device having such a configuration can be applied. As the clutch, a slip clutch is used in the embodiment, but an electromagnetic clutch may be used. In the above embodiment, the delay time of the motor M is measured with the motor M incorporated in the packaging device.
It is also conceivable to apply the same load as in the case of incorporating into the packaging device before measuring. Further, in the above-described embodiment, the delay time of the motor is measured by the count value, but it goes without saying that the time itself may be measured by a timer or the like. [Effects of the Invention] As described above, according to the present invention, the control for adjusting the time difference between the timing at which the film transport unit actually stops and the timing at which the film supply unit actually stops within a predetermined range. Since the means is provided, even if there is a variation in the delay time of the motor brake operation, the tensile strength of the film when driving the cutter can be set to a constant value according to the type of film, and a constant sewing machine The excellent effect that eyes can be formed and the film can be always cut well can be obtained. Therefore, it is not necessary to mechanically adjust the attachment position of the cutter or the like to insert the same amount of perforations in the film as in the conventional case.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic structure of a film transfer mechanism of a packaging apparatus according to an embodiment of the present invention, and FIG. 2 is a brake drive signal indicating a time difference between a stop time of a film supply section and a stop time of a film transfer section. FIG. 3 is a diagram showing a method of adjusting the delivery timing, FIG. 3 is a diagram showing a method of adjusting a time difference between the stop time of the film supply unit and the stop time of the film transport unit by the delivery timing of the motor stop signal, and FIG. 4 is a film. FIG. 5 is a diagram showing the configuration of a supply / transfer control unit, FIG. 5 is a block diagram showing the configuration of the control device of the packaging device, FIG. 6 is an explanatory diagram of a switch for adjusting the drive signal transmission timing of the brake, and FIG. 7 is a type of film. And FIG. 8 are diagrams showing the brake drive signal transmission timing with respect to the motor delay time, FIG. 8 is a diagram showing a flow of automatic adjustment processing of the brake drive signal transmission timing, and FIG. 9 is a brake drive signal transmission timing. It is a diagram showing another automatic adjustment process timing. In the figure, 100 ... film supply section, 200 ... film transfer section, 300 ... film cutting section, 40 ... I / O port, 41 ...
... Sensor, 42 ... Timing signal generation circuit, 43 ... Motor drive circuit, 44 ... Solenoid drive circuit, 45 ... Brake drive circuit, M ... Motor with brake, B ... Brake, 301 ... Cutter.

Claims (4)

[Claims] 1. A film feeding unit feeds a film by a film feeding unit, and when the feeding amount reaches a predetermined length, the film feeding unit and the film feeding unit are stopped at a predetermined timing, Applying tension to the film existing between the rear end of the transport unit and the front end of the film supply unit, and operating a cutter having a saw blade disposed between the rear end of the film transport unit and the front end of the film supply unit. Then, the film is perforated, then the back side of the perforation of the film is held by the film holding section, the front side is transferred by the film transfer section to separate the film from the perforation, and the separated film is It is configured to transfer to a film folding position, the film transfer section is driven by a motor with a brake, and the film supply section is connected via a clutch. In a stretch wrapping device configured to stop the operation by obtaining a driving force from the film transfer unit and operating a brake, the brake is operated after sending a stop signal of a motor with a brake of the film transfer unit. Depending on the delay time until the motor actually stops, when the delay time is long, the sending timing of the drive signal supplied to the brake of the film supply unit is delayed, and when the delay time is short, the film supply unit A control means for adjusting the time difference between the timing at which the film supply unit stops and the timing at which the film transport unit stops by advancing the drive signal transmission timing to the brake is provided. Stretch wrapping equipment. 2. The film fed from the film feeding unit is fed by the film feeding unit, and when the feeding amount reaches a given length, the film feeding unit and the film feeding unit are stopped at a given timing, and the film is fed. Applying tension to the film existing between the rear end of the transport unit and the front end of the film supply unit, and operating a cutter having a saw blade disposed between the rear end of the film transport unit and the front end of the film supply unit. Then, the film is perforated, then the back side of the perforation of the film is held by the film holding section, the front side is transferred by the film transfer section to separate the film from the perforation, and the separated film is It is configured to transfer to a film folding position, the film transfer section is driven by a motor with a brake, and the film supply section is connected via a clutch. In a stretch wrapping device configured to stop the operation by obtaining a driving force from the film transfer unit and operating a brake, the brake is operated after sending a stop signal of a motor with a brake of the film transfer unit. Depending on the delay time until the motor actually stops, if the delay time is long, the timing of sending the stop signal of the brake motor of the film transfer unit is advanced, and if the delay time is short, the film transfer is stopped. A control means is provided for adjusting the time difference between the timing at which the film supply unit stops and the timing at which the film transport unit stops by delaying the timing of sending the stop signal of the brake motor of the unit. Stretch wrapping device characterized by the above. 3. The apparatus itself measures the delay time, and based on the measurement result, the timing of sending a drive signal to be supplied to a brake of the film supply section or the timing of sending a stop signal of a motor with a brake of the film transfer section. The stretch wrapping device according to claim 1, wherein the stretch wrapping device is determined. 4. The stretch wrapping apparatus according to claim 3, wherein the measurement of the delay time is periodically performed during the operation of the stretch wrapping apparatus.