JP3158021B2 - Packaging equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for wrapping heat-sealed objects such as head vegetables such as lettuce and cabbage, and spherical fruits such as melons and apples by wrapping them in a wrapping sheet made of a resin film. It relates to a packaging device.

[0002]

2. Description of the Related Art As a packaging apparatus as described above, an openable and closable holding member for narrowing and holding a package sheet wrapped around a packaged object near a packaged object, and a packing sheet at a position closer to the outside of the sandwiched member than the sandwiched member. It has a heater that can be opened and closed for heat sealing, and the holding member is supported by the heater so that it can be elastically receded and displaced, so that it is opened and closed together with the heater. The clamping member, which has been closed, is configured to be elastically retracted relative to the heater with further closing operation of the heater, and after the end of the heat sealing process for a set time, only the heater is maintained while holding the clamping member. It has been proposed to open in advance and then open the holding member by opening the heater further. To have.

According to this configuration, after the heat sealing process is completed, only the heater is opened in advance while maintaining the holding by the holding member, and then the holding member is opened, so that the vicinity of the packaged object is held by the holding member. Thus, the heat-sealed portion can be reliably cooled and solidified in a state in which the spread action of the packaging sheet does not reach the heat-sealed portion located outside the heat-sealed portion.

[0004]

When the heat sealing portion is cooled while maintaining the holding by the holding member as described above,
By opening the heater by an appropriate small amount, the holding member elastically supported by this heater can be left open at the holding position and only the heater can be opened in advance.However, if the opening amount of the heater is too large, the holding member itself is elastically held. The function may be weakened, and the function of preventing the spread of the packaging sheet from reaching the heat seal portion may be reduced. Conversely, if the opening amount of the heater is small, the heat of the heater will hinder the cooling of the heat seal portion, and setting the small opening amount of the heater accurately ensures the cooling and solidification of the heat seal portion. Important for.

An electric motor is used to open and close the heater, and the heat sealing time is set by controlling the time during which the electric motor is stopped. As a related control, the amount of opening of the heater for cooling the heat sealing portion is controlled. Although control can be performed as the energizing operation time of the electric motor, the amount of motor operation within the set time varies greatly depending on the power supply condition, and the accuracy of the opening amount of the heater may deteriorate. SUMMARY OF THE INVENTION An object of the present invention is to make it possible to reliably perform cooling and solidification of a heat seal portion by accurately performing a small opening amount of a heater for cooling and solidifying a heat seal portion.

[0006]

[Means for Solving the Problems]

[Structure] The invention according to claim 1 is an openable and closable holding member for narrowing down and holding a package sheet wrapped around a packaged object near the packaged object, and heat sealing the narrowed packaging sheet at a position outside and close to the holding member. The heater is configured to be openable and closable, and the holding member is supported by the heater so that it can be elastically retracted so that the heater can be opened and closed together with the heater. The completed holding member is configured to retreat elastically relative to the heater with further closing operation of the heater, and after the end of the heat sealing process for a set time, only the heater is preceded while maintaining the holding by the holding member. In a packaging device configured to open the holding member by further opening the heater and then opening the holding member,

A heater which elastically supports the holding member,
A phase detection mechanism is provided that is mechanically linked to a drive arm that is rotationally driven by an electric motor, and that detects a rotation phase of the drive arm. Based on the detection result of the phase detection mechanism, the heater is located at the heat seal position. The drive arm is stopped at a predetermined rotation phase, and after the heat sealing process is completed, the drive arm is rotated to a predetermined rotation phase at which only the heater is opened in advance while maintaining the holding by the holding member, and then stopped. In addition, a phase detection mechanism and an electric motor driving means are linked.

According to the first aspect of the present invention, the small opening amount of the heater for cooling the heat sealing portion is controlled as the angular phase of the driving arm for opening and closing the heater. Even if the speed of the electric motor to be driven changes due to the power supply situation, etc., the heater can be opened precisely and a small amount by the set amount, and the spreading operation of the packaging sheet is reliably prevented from reaching the heat sealing part. The heat seal portion can be cooled and solidified accurately.

According to a second aspect of the present invention, there is provided a detecting member having a phase detecting mechanism attached to a driving arm and having a predetermined length in a rotational direction and a position fixedly provided beside a rotation locus of the detecting member. And a sensor for detecting a circumferential end of the member.

According to the second aspect of the present invention, since the circumferential length of the detection member provided on the drive arm is the opening amount of the heater, the opening amount detection is always stable unless the detection member is replaced. It can be performed. Since the drive arm and the sensor are not connected by a shaft or the like, there is no mechanical wear or rotational force transmission compared to when detecting the rotation phase of the drive arm with a continuous potentiometer or a rotary encoder, for example. It can function well over a long period of time.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 18 shows the entirety of the packaging apparatus. The packaging sheet 1 wound in a roll is supported by one pair of support rollers 33 so as to be freely rotatable on one side of a packaging table 2 having an opening 2a in the center. Between the support roller 33 and the packaging table 2, a cutting mechanism 34 in which a cutter (not shown) for the packaging sheet 1 is provided is arranged. A pull-out mechanism 35 for the packaging sheet 1 is disposed on the opposite side of the packaging table 2, and the pull-out mechanism 35 is configured to be movable between a pull-out position shown in FIG. Below the opening 2a of the packaging table 2, the support table 3 and the first holding member 14 for the article to be packaged A are arranged as shown in FIGS.

As shown in FIG. 6, a first support member 6 is vertically slidably mounted on a pair of left and right guide rails 5 arranged below the opening 2a of the packaging table 2. The support base 3 is supported by a second support member 17 fixed to the upper part of the base member so that the support base 3 can fall sideways around the horizontal axis P1. The support base 3 is formed by bending four sides of a flat plate having a plus shape in plan view upward, and an elastic material 4 such as sponge or soft rubber is attached to an outer surface thereof.

A pair of upper and lower sprockets 7 are arranged beside the guide rail 5, and a chain 8 is wound around the two sprockets 7, and a bracket 6 a of the first support member 6 is connected to the chain 8. Thereby, the motor (not shown)
The sprocket 7 and the chain 8 are rotated to drive the support base 3 up and down.

The horizontal axis P3 at the left and right ends of the second support member 17
A pair of holding arms 18 are swingably supported around the holding member 18, and a horizontally long sponge member 18 a is provided on an upper end of the holding arm 18.
And a spring 19 for urging the left and right holding arms 18 to swing toward the center support base 3 is provided. As shown in FIG.
7 and an operation arm 21 that is operated to switch between an up and down posture shown in FIG. 7 and a left and right posture shown in FIG.
Are connected by

Next, the structure of the heater 9, the pair of plate-shaped narrowing members 14, and the sandwiching member 16 disposed below the opening 2a of the packaging table 2 will be described. As shown in FIGS. 1, 2, and 4, below the packaging table 2 on both sides of the opening 2a,
A first guide rail 23 having a round bar shape and a second guide rail 24 having a plate shape are arranged, and the guide plate 1 is provided on one side of the opening 2a.
2 is fixed. A boss 13a is fixed to one end of the pair of support plates 13, and the boss 13a is
3, a roller 13b provided on the opposite side of the support plate 13 is slidably mounted on the second guide rail 24. Thus, the pair of support plates 13 are slidably supported left and right, and the heater 9 is fixed to each of the support plates 13.

As shown in FIGS. 1 and 2, the electric motor 2
8, a driving arm 28a that is driven to rotate in a fixed direction (counterclockwise in FIG. 2) is provided, and a bracket 25 fixed to the boss portion 13a of one of the support plates 13 and the driving arm 28a are linked rods. 26. A balance arm 27 is swingably supported around a longitudinal axis P4 of the fixed portion, and a roller 27 at one end of the balance arm 27 is supported.
a is inserted into the concave portion of the bracket 25, and the linking rod 29 is connected to the other end of the balance arm 27 and the boss 13 a of the other support plate 13. As a result, the two support plates 13 are slid open and closed right and left by a crank motion using the drive arm 28a and the balance arm 27.

As shown in FIGS. 1, 2 and 4, a plate-like narrowing member 14 is slidably supported by rollers 13c supported by a support plate 13 within the range of a long hole 14a.
3 and a pair of tension springs 32 across the narrowing member 14.
Is connected. A plate-like holding member 16 is connected and fixed to a pair of support pins 14 b fixed downward to the narrowing member 14.

As shown in FIGS. 2 and 4, a pair of holding arms 30 are provided below the support plate 13 opposite to the guide plate 12 so as to swing in a direction perpendicular to the direction in which the support plate 13 slides. ing. The holding arm 30 is swingably supported on the lower side of the support plate 13 around the longitudinal axis P2 of the fixed portion, and is provided with a rectangular long hole 30a, which is provided on the back surface of the support plate 13. A pair of rollers 13d is inserted into the long hole 30a, and a guide plate 10 that supports the holding arm 30 so that the holding arm 30 does not face downward is laid across both rollers 13d.

In the initial state, the drive arm 28a is located at the origin position O, which is one dead point of the crank motion, and is rotated counterclockwise from the origin position O so that the right support plate 13 slides leftward. The narrowing member 14 and the holding member 16 on the right side together with the support plate 13
Is also slid to the left. In conjunction with this operation, the balance arm 27 swings clockwise, the linking rod 29 is pulled rightward, and the left support plate 13 and the narrowing member 1 are moved.
4 and the holding member 16 are slid rightward. When the drive arm 28a reaches the other dead point position C,
The two support plates 13 are in the closest closed state.

As described above, when the right supporting plate 13 in FIG. 2 is slid leftward, the supporting plate 13
In conjunction with the advance of the roller 13d, the pair of holding arms 30 that have been opened up and down are swingably operated so as to approach each other. When the operation arm 28a is rotated by 180 ° in this manner, the upper portion 1a of the packaging sheet 1 is narrowed and sandwiched by the narrowing member 14, the nipping member 16 and the nipping arm 30.

Next, the drawer mechanism 35 for automatically extracting the packaging sheet 1 from the packaging sheet 1 wound into a roll for packaging will be described. As shown in FIGS. 5A and 5B, a pair of support plates 36 are slidably supported by rollers 36a along the left and right guide rails 2b of the packaging table 2. A support shaft 37 is provided, and five operation arms 38 are mounted on the support shaft 37.
Are fitted to each other so as to be swingable independently. A top plate 39 is erected and connected over the upper ends of the left and right support plates 36, and a spring 40 for biasing each holding arm 38 to the swinging side of the top plate 39 is provided, thereby forming a drawer mechanism 35. I have.

The support shaft 37 is rotatably supported by a support plate 36, and a pair of arms 3
7a is fixed, and one rod 37b is erected and fixed over the left and right arms 37a. A fan gear 41 is swingably supported by a support shaft of a roller 36a of one support plate 36, and a link 42 is provided between the fan gear 41 and one arm 37a. A motor 43 that is driven to move is provided.

The state shown in FIG. 5A is a state in which the electric motor 43 is driven to push up the rod 37b to pull down each holding arm 38 from the top plate 39. As shown in FIG. By driving the motor 43 in the reverse direction, the rod 37b
Is lowered, each holding arm 38 is biased by the spring 40.
Rises to the top plate 39 side to clamp the end of the packaging sheet 1.

As shown in FIGS. 5A and 5B, the packaging table 2
One drive shaft 44 is disposed at one end of the drive shaft 4.
A pair of drive sprockets 45 are fixed to both ends of the drive shaft 4, and an electric motor 46 that drives the drive shaft 44 to rotate is provided. One driven shaft 47 is attached to the opposite end of the packaging table 2.
Are arranged, and driven sprockets 48 at both ends of the driven shaft 47 are provided.
Has been fixed. A pair of left and right chains 49 are wound around the left and right driving sprockets 45 and the driven sprockets 48, and the left and right chains 49 are connected to the left and right support plates 36 of the pullout mechanism 35. With the above structure,
The drawer mechanism 35 is moved along the guide rail 2b of the packaging table 2 by driving the drive sprocket 45 to rotate forward and reverse by the electric motor 46.

Next, the packaging process in this packaging device will be described.
A description will be given based on FIGS. 16 and 17. As shown in FIG. 18, in a state where one package sheet 1 cut to a predetermined length is placed on the packaging table 2, the worker manually places the packaged object A on the packaging table 2.
Is dropped into the opening 2a of the packaging table 2, and while the article to be packaged A is wrapped to some extent in the packaging sheet 1 and supported by the support table 3 as shown in FIG. The user presses 50 simultaneously with both hands (step S1). As a result, a pair of holding arms 18 arranged on both sides of the support base 3 are pivoted toward the packaged object A as shown in FIG. 7, and the packaged object A is held on the support base 3 by the holding arm 18. (Step S2), the lowering operation of the support base 3 is started (Step S3).

As shown in FIG. 7, an optical sensor 31 composed of a light-emitting device and a light-receiving device is disposed above the narrowing member 14 so that the detection light from the light-emitting device passes directly below the opening 2 a of the packaging table 2. When the light receiver of the optical sensor 31 receives the detection light from the light emitter, the support base 3 is stopped at that position (see the position shown in FIG. 7) (steps S4 and S5). In this case, a plurality of rubber plate-shaped auxiliary drawing members 11 are provided below the opening 2a so as to surround the article A to be packaged. 1 is squeezed well. When the support 3 stops at the position shown in FIG. 7 as described above, the pair of holding arms 18 are slightly opened (Step S).
6), the drive arm 28a starts rotating counterclockwise from the origin position O, and the pair of support plates 13 is slid toward the support base 3 (step S7).

In the initial state, the distal end of the narrowing member 14 protrudes toward the support 3 from the distal end of the heater 9, and the distal end of the holding member 16 is positioned closer to the support 3 than the distal end of the narrowing member 14. Accordingly, when the support plate 13 is slid to the support base 3 side, first, the holding member 16 and the holding arm 30 are moved to the upper portion 1a of the packaging sheet 1 as shown in FIG.
In between. Since both ends of the holding member 16 are integrally connected to each other by the support pins 14b in a state in which the front end of the holding member 16 protrudes ahead of the front end of the narrowing member 14, the lower holding member 16
In a state in which the wrapping sheet 1 is sandwiched and stopped, the upper narrowing member 14 is in a state of squeezing the upper portion 1a of the wrapping sheet 1 lightly.

Further, the drive arm 28a rotates counterclockwise, and the support plate 13 further moves from the state shown in FIG.
Slide operation to the side. Along with this, the tension spring 32
Is stretched, and the heater 9 fixed to the support plate 13 is moved between the narrowing member 14 and the holding member 16 while the holding member 16 is strongly pushed to the holding side of the upper portion 1a of the packaging sheet 1. The packaging sheet 1 is inserted.

When the narrowing member 14, the holding member 16 and the holding arm 30 hold the upper portion 1a of the packaging sheet 1 as shown in FIG. A itself is lifted up with the packaging sheet 1 and lifts up, and the packaging sheet 1
As a result, the article to be packaged A is tightened, the wrinkles of the packaging sheet 1 are entirely extended, and a beautiful package can be expected. In this case, the holding arm 18 is slightly opened as described above (step S6), and the narrowing member 14, the holding member 16, and the sponge member 18a of the holding arm 18 are separated from the packaged object A and the packaging sheet 1. When the holding arm 30 is advanced to the holding position, the lifting of the packaging sheet 1 and the article to be packaged A is not hindered by the sponge member 18a of the holding arm 18, and the sponge member 18a of the holding arm 18 and the article A Is not rubbed, so that the packaged object A is not damaged.

As shown in FIG. 8, as the upper part 1a of the packaging sheet 1 is sandwiched, the article A to be packaged rises slightly from the support base 3, but the support base 3 is slightly lifted up, and The package A includes the holding member 16 and the holding arm 30.
(Step S8).

When the drive arm 28a further rotates counterclockwise and reaches the dead point C, this is detected by the phase detection mechanism 60 and stopped (steps S9 and S10). As shown in FIGS. 1, 12, and 15, the phase detection mechanism 60 is configured such that an arc-shaped detection member 61 protruding from a lower surface of the drive arm 28a and both sides of a rotation locus of the detection member 61 are provided. A transmission type optical sensor 6 in which a sender and a receiver are arranged.
And 2. As shown in FIG. 13, when the drive arm 28a reaches the dead point C, the optical sensor 62 detects the front end in the rotation direction of the detection member 61 as a change in light shielding, and the drive arm 28a is stopped by this detection. Actually, since the overrun occurs when the drive arm 28a stops, the front end position of the detection member 61 is set in anticipation of this.

When the driving arm 28a is stopped at the dead point C as described above, the heater 9 is in the most closed state.
a is heat-sealed for a set time T1 (step S11). The set time T1 of the heat seal is adjustable, for example, 0.5 seconds is standard, and 0.7
The heat sealing time of 5 seconds and 1.0 seconds can be selected according to the material of the packaging sheet 1 and the like.

When the heat-sealing process for the set time T1 is completed, the drive arm 28a starts to rotate counterclockwise again (step S12).
As shown in FIG. 4, this is detected by the phase detection mechanism 60, and the rotation of the drive arm 28a temporarily stops (step S1).
3, 14). In the phase detection mechanism 60, the rotation end of the detection member 61 in the rotation direction is detected by the optical sensor 62, so that the rotation of the drive arm 28a by the set angle θ is detected. Also in this case, the rear end position in the rotation direction of the detection member 61 is set in anticipation of overrun.

In this manner, when the drive arm 28a is stopped by rotating the set angle θ from the dead point C, which is the heat sealing action position, as shown in FIG. Upper part 1a of
Then, the opening operation is performed by a set small amount, and the tension spring 32 which has been extended in the state of FIG. 9 is slightly returned, and the sheet holding state by the holding member 16 and the sheet narrowing state by the narrowing member 14 are maintained. You.

The above state is maintained for a set time T2.
With the time-up, the drive arm 28a starts to rotate counterclockwise again (steps S15 and S16). During the set time T2, the heat sealing portion is cooled and solidified in the upper portion 1a of the packaging sheet 1, and the sealing is sufficient.
The set time T2 can be selected in a plurality of stages of, for example, 0 seconds, 1 second, and 2 seconds according to the material and thickness of the packaging sheet 1.

In the state shown in FIG. 10, the drawer mechanism 35 stopped at the drawer position shown in FIG. 18 moves to reach the holding position of the cutting mechanism 34, and
5, the packaging sheet 1 is formed by the top plate 39 and the holding arm 38.
Is clamped (step S22). In this case, as shown in FIGS. 5 (a) and 5 (b), a support shaft 51 is bridged below the left and right support plates 36 of the drawer mechanism 35, and a removal plate 52 is fixed to the center of the support shaft 51.

As a result, as shown in FIG. 10, the lower portion of the heat seal portion is sandwiched by the sandwiching member 16 and the drawer mechanism 35 is stopped during the set time T2 in which the heater 9 is stopped slightly away from the heat seal portion. Is the cutting mechanism 34
Is moved to the clamping position side, the removal plate 52 of the drawer mechanism 35 moves along the upper surface of the narrowing member 14, and the removal plate 5
2, the upper part 1a of the packaging sheet 1 is removed from the packaged object A and carried to the cutting mechanism 34 side. In this case, since the lower portion of the heat seal portion is sandwiched and held by the holding member 16, even if the upper portion 1a of the packaging sheet 1 is removed as described above, the heat seal portion is not broken. Absent.

When the set time T2 is set to 0 seconds (when the drive arm 28a is set not to stop even when rotated by the set angle θ from the dead point C), the holding member 16 is opened slightly. The drive arm 28a is temporarily stopped for about one second after rotating the drive arm 28a more than the set angle θ, and the upper portion 1a of the packaging sheet 1 is removed during the pause.

After the lapse of the set time T2, when the drive arm 28a whose rotation has been resumed reaches the origin position O, as shown in FIG. 12, another detecting member 63 protruding from the lower surface of the drive arm 28a detects the optical sensor 62. Transmission type optical sensor 6 similar to
4, the rotation of the drive arm 28a is stopped (steps S17, S18). Next, the holding arm 18 is opened rightward and leftward to the original position (step S19), the support base 3 is further lowered and operated sideways, and the packaged object A is released to the slide 15 (see FIG. 18) and collected. Is performed (step S20). As described above, the packaging of one packaged object A is completed, and thereafter, the support 3 is again moved up to the original position shown in FIG. 6 and stopped (step S21).

In the above operation, while the package A is being packaged, the drawer mechanism 35 is moved to the position shown in FIG.
Is moved to the holding position of the cutting mechanism 34 from the pull-out position shown in FIG. 5 (while the upper part 1a of the packaging sheet 1 is removed), and as shown in FIG.
5 (Step S22), the drawer mechanism 35 starts to move to the right in FIG. 18 again as shown in FIG. 5B, and the drawing operation of the packaging sheet 1 is started (Step S23). .

When the drawer mechanism 35 reaches the holding position and holds the end of the roll-shaped packaging sheet 1, the lower end of the upper portion 1 a of the packaging sheet 1 riding on the removal plate 52 of the drawer mechanism 35 becomes a narrowing member. 14, when the drawer mechanism 35 moves to the right side of the drawing in FIG. 18 from the nipping position, the removing plate 52 of the drawer mechanism 35 is separated from the upper portion 1 a of the packaging sheet 1, and
Of the narrowing member 14 falls downward.

Marks 1b are printed on the packaging sheet 1 at predetermined intervals, and when the packaging sheet 1 is pulled out by a predetermined length by the drawer mechanism 35, the marks 1b are printed on the packaging sheet 1 as shown in FIG. The mark 1b is also pulled out, the mark 1b is detected by the optical sensor 53, and the pull-out mechanism 35 is temporarily stopped (step S2).
4) In this state, the packaging sheet 1 is cut by the cutting mechanism 34 (Step S25).

When the packaging sheet 1 is cut to the predetermined length as described above, the drawer mechanism 35 starts to move to the right in FIG. 18 again, and the packaging sheet 1 cut to the predetermined length is shifted to the right in FIG. The center of the packaging sheet 1 cut to a predetermined length as shown in FIG.
, The drawer mechanism 35 stops at this drawer position, and the end of the packaging sheet 1 is separated from the top plate 39 and the holding arm 38 of the drawer mechanism 35 (step S26). Thereby, one packaging sheet 1 cut to a predetermined length is placed on the packaging table 2.

While the package A is being packed as described above, in parallel with this, the next packaging sheet 1 for packaging is pulled out, cut into a predetermined length, and placed on the packaging table 2. Place. Thereby, when the empty support base 3 is moved up to the original position, the packaging sheet 1 for the next packaging is already placed on the packaging base 2, so that the time required for one packaging operation is obtained. Can be shortened.

[Another Embodiment] The present invention can also be carried out in the following modes. In the above-described embodiment, as shown in FIGS. 1 and 4, the heater 9 is provided with a pair of narrowing members 14 on the upper side, and a pair of holding members 16 on the lower side. A pair of holding members 16 are provided only below the heater 9.
May be provided.

In the above-described embodiment, FIGS.
As shown in the figure, the package sheet 1 is provided with a pull-out mechanism 35 and a cutting mechanism 34 for automatically pulling out the packaging sheet 1. However, such a pull-out mechanism 35 and the cutting mechanism 34 are eliminated, and the packaging sheet cut to a predetermined length is provided. A configuration may be adopted in which a large number of sheets 1 are placed next to the packaging table 2 in a stacked state, and an operator takes out the packaging sheets 1 one by one and places them on the packaging table 2. In the case of such a configuration, FIG.
Since the drawer mechanism 35 for supporting the removing plate 52 as shown in (b) is eliminated, a dedicated driving mechanism for supporting and driving the removing plate 52 is provided. The phase detecting mechanism 60 includes a light-shielding detection member 61 and an optical sensor 62 for detecting the end of the light-shielding member. The detection member 61 is formed of a magnetic material or a magnet. Or a reed switch can also be used.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a heat sealing structure.

FIG. 2 is an exploded plan view showing the heat seal structure in an initial open state.

FIG. 3 is an exploded plan view showing the heat seal structure in a narrowed state.

FIG. 4 is a longitudinal sectional side view showing a heat seal structure in an initial open state.

FIG. 5 is a vertical sectional side view showing a packaging sheet draw-out mechanism and a packaging table.

FIG. 6 is a front view of the vicinity of the support, showing a state where the packaged object is dropped on the support.

FIG. 7 is a front view showing a state where the support base is further lowered.

FIG. 8 is a front view showing a state in which the upper portion of the packaging sheet is narrowed down and sandwiched;

FIG. 9 is a front view showing a heat sealing process.

FIG. 10 is a front view showing a retracted state of only the heater.

FIG. 11 is a front view showing a state after completion of heat sealing.

FIG. 12 is a plan view showing a state in which the drive arm is at an origin position.

FIG. 13 is a plan view showing a state where the drive arm has reached a dead point.

FIG. 14 shows the setting angle θ of the drive arm from the dead point.
Top view showing only rotated state

FIG. 15 is a side view of the vicinity of the phase detection mechanism.

FIG. 16 is a diagram showing the first half of the flow of the packaging operation.

FIG. 17 is a diagram showing the latter half of the flow of the packaging operation.

FIG. 18 is an external perspective view showing the entire packaging device.

[Description of Signs] 1 Packaging sheet 9 Heater 16 Holding member 28 Electric motor 28a Drive arm 60 Phase detection mechanism 61 Detection member 62 Sensor

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 5-58604 (JP, U) JP-A 3-133710 (JP, U) JP-A 56-49705 (JP, U) JP 5-95 95803 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B65B 11/48 B65B 11/54 B65B 25/04 B65B 51/10 B65B 51/32 B65B 57/00

Claims (2)

(57) [Claims] 1. An openable and closable holding member (16) for narrowing and holding a packaging sheet (1) wrapping an object to be packaged (A) near an object to be packed, and the holding member for holding the narrowed packaging sheet (1). (16) An openable / closable heater (9) for performing heat sealing at a position closer to the outside than the heater (9) is provided. The holding member (16) is supported by the heater (9) so as to be capable of being elastically retracted and opened / closed together with the heater (9). And the holding member (16) is first closed by the closing operation of the heater (9), and the closed holding member (16) is further closed by the closing operation of the heater (9). With the heater (9), the sheet is resiliently retracted, and after the heat sealing process for a set time is completed, the sheet holding by the holding member (16) is maintained. In a packaging apparatus configured to open only the heater (9) in advance, and then further open the heater (9) to open the holding member (16), the holding member (16) is elastically moved. The mechanically supported heater (9) is mechanically linked to a drive arm (28a) that is rotationally driven by an electric motor (28), and a phase detection mechanism (R) detects the rotational phase of the drive arm (28a). 60), based on the detection result of the phase detection mechanism (60), the heater (9) stops the drive arm (28a) at a predetermined rotation phase at the heat sealing position, and performs the heat sealing process. After the end, the drive arm (28a) is rotated to a predetermined rotation phase in which only the heater (9) is opened in advance while maintaining the holding by the holding member (16). Wherein the phase detection mechanism (60) and the electric motor control means are linked so as to stop. 2. A phase detecting mechanism (60) having a predetermined length in a rotation direction attached to a drive arm (28a), and a position fixed to a side of a rotation locus of the detection member (61). And a sensor (62) for detecting an end of the detection member (61), and stopping the drive arm (28a) based on the detection of the front end in the rotation direction of the detection member (61). Then, the heater (9) is stopped at the heat sealing action position, and the drive arm (28a) is stopped based on the detection of the rear end in the rotation direction of the detection member (61), so that only the heater (9) is opened. 2. The packaging apparatus according to claim 1, wherein a mounting phase and a rotation direction length of the detection member are set.