JPS62193910A - Film folding device for packaging in packaging machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) The present invention is directed to, for example, a packaging machine for fresh food, in which a packaging film stretched and gripped by the packaging section of the machine is folded into a tray to package the product. The present invention relates to a folding device for folding.

(Prior Art) Conventionally, for example, in the packaging machine described in JP-A No. 58-90010, the packaging film stretched on the packaging section is clamped by both front and rear presser members at both edges in the width direction. When the tray on the pedestal device is pushed up to the packaging position, the packaging film is stretched to cover the tray from above, and then the packaging film is folded by the folding device below the tray. The tray is then wrapped.

That is, for example, in the folding device of the packaging machine, the rear folding member moves in the front and rear directions with respect to the fixed front folding member, approaching and separating from each other, and below the rear folding member, as the rear folding member moves back and forth, the rear folding member moves left and right. Both folding members open and close each other, and the article mounting table provided upright on the pedestal device can tilt inward when it comes into contact with the rear folding member and both left and right folding members.

Then, as the rear folding member moves forward and the left and right folding members close each other, these folding members push the packaging film toward the bottom of the tray on the mounting table and contact the mounting table. Touch it and tilt it. When the pedestal device moves downward at the same time as this tilting, the tray is sequentially placed on the rear folding member from the rear side of the lower surface, and the packaging film is folded under the tray from both rear and left and right directions. Thereafter, when the tray is conveyed forward by the rotation of the conveyor bell 1~ and transferred from the rear folding member to the front folding member, the packaging film hits the front folding member on the underside of the tray during the transfer, and the packaging film hits the front folding member from the front. The tray is also folded in, and the folding from the rear overlaps with the folding from both the left and right directions, and the folding from the front overlaps to form a folded portion at the bottom of the tray. Next, the rear folding member retreats, and as the rear folding member retreats, the left and right folding members also open from each other.

(Problem to be Solved by the Invention) However, the left and right folding members are supported so as to be rotatable in the left-right direction on both the left and right sides of the rear folding member, and the distance between the pivot points and the maximum distance between the tip portions are limited. Since the opening dimension is always constant, if the width in the left and right direction of the item corresponding between the left and right folding members changes, the insertion size of the left and right folding members on both the left and right sides of the lower surface of the item will change, and the packaging state will not be constant. In other words, if the product width is too large, the penetration dimension will become too large, and the packaging film will cover the bottom surface of the product more than necessary, resulting in waste.On the other hand, if the product width is too small, the penetration dimension will become too small. The area covered by the packaging film decreases, and the packaging film tends to peel off from the bottom surface of the item, resulting in poor packaging conditions.

Therefore, the first option is to make it possible to adjust the maximum distance between the tips of the left and right folding members, so that, for example, the length of penetration of the left and right folding members on both the left and right sides of the bottom surface of the item can be made almost constant. It is an invention. Moreover, the second invention is such that it is possible to automatically select the optimum opening size according to the width of the article in the left and right direction.

Structure of the Invention Means and Effects for Solving the Problems) That is, the first invention provides a rear folding member 77 and a front folding member 89 that are movable relative to each other in the front and rear directions, as shown in the drawings of embodiments to be described later. and left and right side folding members 82 supported rotatably in the left and right direction on both left and right sides of the rear folding member 77, and between these front and rear, left and right folding members 89, 77, 82, each folding member 8
9.77.82 In a packaging film folding device having a folding part R for folding the packaging film F into the article W by approaching each other, the left and right folding members 8 maintain a constant interval M.
2, the left and right support members 82a that can move toward and away from each other, a drive mechanism 141 that moves the left and right support members 82a toward and away from each other, and guide pins 147 on both left and right sides of the rear folding member 77. A guide @146 is formed on a guide plate 143 that is supported movably in the left and right direction and extends from both support members 82a, and this guide groove 14
6 is engaged with a guide pin 147, and a link 149 is rotatably supported by the guide pin 17 and the left and right folding members 82 to interlock them.

Then, when the left and right support members 82a move toward and away from each other by the drive mechanism 141, the guide plate 143 and the guide pin 147 move in the left and right direction while maintaining the same positional relationship, and the left and right folding members 82 move towards the link 1.
It opens and closes via 49. In this way, the left and right front support members 8
Optimal spacing between 2a N 4! - When selected, the positions of the left and right folding members 82 can be adjusted. Further, when the rear folding member 77 moves in the front-rear direction, the guide pin 147 moves along the guide groove 146 of the guide plate 143, and the left and right folding members 82 rotate around the pivot point 84 by the link 149. open and close each other.

In addition to the first invention, a second invention provides that when an unpackaged item W is sent to the folding section R, the left and right side folding is performed between the left and right folding members 82 according to the width of the item W in the left and right direction. Part 8
storage means 172 for pre-storing the position data N of No. 2; article width sensing means 153 for detecting the width of the unwrapped article W in the left-right direction; and detection 1 from the article width sensing means 153.
a first indexing means 171 that calculates the horizontal width of the article W based on No. 5; a position detecting means 158 that detects the position of the left and right folding members 82;
a second indexing means 171 that calculates the position of the left and right folding members 82 based on detection signals from the left and right folding members 82; 82 is read from the storage means 172, and the position data N of the left and right folding members 82 descended by the second indexing means 171 is made to match the position data N read from the storage means 172. and a drive control means 171 for driving and controlling the drive mechanism 141.

Then, depending on the width of the item W in the left-right direction, the optimum distance N between the left and right support members 82a can be automatically selected.

(Example) Hereinafter, a case in which a packaging film folding device according to an example of the present invention is used in a fresh food packaging machine will be explained in accordance with the drawings.

Fig. 1.2 shows a round belt type film transport device 1 installed on the upper part of the machine frame, and as shown in Fig. 2, the starting end of the packaging film F is guided and set from the film supply port P. From this set state, the packaging film F is spread onto the packaging section S in FIG. 1 by driving the conveying device 1.

As shown in FIG. 1.2, a packaging film folding device 76 is installed above this packaging film conveying device 1, and a packaging film folding device 77 is installed above the packaging film conveying device 1.
As shown in Fig. 3.5, seven sliders are supported so as to be movable in the front and rear directions with respect to rails 78 arranged on both the left and right sides of the upper part of the machine frame, and are connected to a connecting plate 80 and rollers on both the front and rear sides thereof. The rear folding member 81 is connected, and the rear folding member 82a is the rear folding member 7.
Both left and right support members 82 are supported movably in the left and right directions with respect to a support plate 83 installed between the rear ends of both rails 78 at the rear of the rails 78. Both left and right folding members are rotatably attached to the shaft 84, and the rear folding member 77 is connected to the coaxial 84 attachment portion (rotation fulcrum).
It extends forward through the lower part of the auxiliary folding plate 86 at the tip.
is screwed on so that its position can be adjusted. Note that the interval M between the pivot points 84 is constant.

Reference numeral 89 denotes a front folding member installed between the front ends of both the rails 78, which includes both front and rear conveyance rollers 90 and a folding roller 91 provided behind the rear side conveyance roller 90. A plurality of round belts 90a are passed between the rear conveyance roller 90 and the folding roller 91, and a round belt 90b is passed between the rear conveyance roller 90 and the folding roller 91 at both ends thereof. It is designed to rotate only in the direction of arrow C.

Reference numeral 140 denotes a threaded rod supported on the support plate 83 so as to extend in the left-right direction, and has a left-hand threaded portion 140a and a right-hand threaded portion 140b.
One of the support members 82a is screwed into the left-hand threaded portion 140a, and the other support member 82a is threaded onto the right-hand threaded portion 140a.
0b. 141A is an electric motor installed on the machine frame behind the left and right support members 82a, and a pulley 142a of its output shaft 141a is connected to a pulley 142b attached to a threaded rod 140 between the left and right support members 828. On the other hand, they are interlocked via a flat belt 142. When the screw head 140 is rotated by this electric motor 141A, both the left and right support members 82a
0a and 140b to approach or separate from each other. The screw rod 140, the electric motor 141A, the flat belt 142, and the like constitute a drive mechanism 141 for the left and right support members 82a.

In Fig. 3.4.5, 143 is the left and right support member 8.
It is a guide plate in the shape of a lance fixed to the front part of the guide plate 2a, and consists of a base handling part 143a extending to the left and right sides, and an engagement plate part 143b extending forward along the rail 78 from the tip of the base handling part 143a. Roller 1 attached to the tip of portion 143b
44 is supported movably in the left and right direction on the rail portion 145 on the b1 frame. And both left and right support members 82a
When the guide plate 143 moves in the left-right direction, both the left and right guide plates 143 also move in the same direction with this movement. 14
6 is a guide groove formed in the engagement plate portion 143b of the guide plate 143 so as to extend in the front-rear direction, and 147 is a guide pin engaged with this guide groove 146, which is located below the engagement root portion 143b. The folding member 77 is supported by a projecting plate portion 79a protruding from the slider 79 through an elongated hole 148 so as to be movable in the left-right direction. A link 149 is rotatably supported between the lower end of the guide pin 147 and the front end sides of both the left and right folding members 82. When the slider 79 of the rear folding member 77 moves forward and backward along the rail 78, the guide pin 1
47 moves along the guide groove 146 of the guide plate 143, and the left and right folding members 82 are connected to the rotation fulcrum 8 by the link 149.
4 to open and close each other. Further, when the left and right support members 82a approach and separate from each other, the guide pin 147 moves along the long hole 148 of the slider 79, while the guide plate 143 and the guide pin 147 move in the left and right direction while maintaining the same positional relationship. Along with parallel movement,
The left and right folding members 82 open and close via links 149.

Note that the guide plate 143, the guide groove 146, the guide pin 147, the link 149, and the elongated hole 148 of the slider 79
Thus, an interlocking mechanism between the rear folding member 77 and the left and right folding members 82 is configured.

In FIGS. 1 and 2, 93 is a bracket erected on the rear end of the rail 78, and 94 is a lever fixed to a support shaft 95 rotatably installed between the upper parts of the bracket 93. A shaft 96a is rotatably attached to an interlocking rod 96 that is driven up and down. 97 is the bracket 93
A pair of levers 98 are fixed to both ends of the support shaft 95 on the outside of the lever 97, and 98 is a link rotatably attached to the shaft 99 at the tip of the lever 97. 100 places have been placed.

When the interlocking rod 96 is in the upward movement position, the rear folding member 77 is in the retracted position and the left and right folding members 82 are in an open state as shown in FIG. 3.5. . When the interlocking rod 96 moves downward from this state, the rear folding member 77 is pushed forward by the lever 97 and the link 98 as shown in FIG. The position of the groove 146 is regulated and the left and right folding members 82 are closed to each other via the link 149, and these front, rear, left and right folding parts +489.7
The area between 7.82 and 82 is defined as the folded portion R. This folding part R is the first
As shown in the figure, it corresponds to the packaging section S of the packaging film transport device 1.

1 and 2 show a device 101 for discharging goods W, and reference numeral 102 denotes a support shaft 103 installed between the lower portions of both brackets 93.
a pair of links rotatably supported on both sides of the
A pair of links 3 are rotatably supported on both sides of a support shaft 114 installed between both brackets 93 below the support shaft 103, and each link 102,
113 extends forward from the support shafts 103 and 114. 1
16 is a shaft 11 between the tips of both links 102 and 113.
6a and 116b are rotatably connected to each other, and a roller 120 is attached to a portion extending forward from both left and right shafts 116b on the lower side. 104
104a is a conveyor in which an endless sponge belt T" 104a is hung, and is supported by a guide plate 115 extending rearward from both sides of the rear end so as to be rotatable in the vertical direction with respect to the shaft 116b. The guide plate 115 is placed on the roller 120 of the interlocking link 116 and is supported in a horizontal state on the packaging section S of the packaging film conveying device 1. Reference numeral 117 is a connecting rod connected between both the interlocking links 116. , 118 is a handle rotatably supported on a support rod 119 installed between the upper parts of both brackets 1 to 93, and its threaded rod 118a is connected to the connecting rod 117.
are screwed together.

Then, when the handle 118 is rotated at the same time, the connecting rod 117
moves along the threaded rod 118a, and both links 102
．． 113 rotates in the vertical direction around the support shafts 103 and 114, the interlocking link 116 moves in the vertical direction, and the conveyor 104 moves in the vertical direction while the roller 120 of the interlocking link 116 drives the guide plate 115 of the conveyor 104. Parallel movement to.

108 is a belt pulley fixed to the drive shaft 104b of the conveyor 104, 109 is a belt pulley rotatably supported by the support @114, and both belt pulleys 108 and 109
A round belt 110 is stretched between them. Reference numeral 121 denotes an idler pulley fixed to the guide plate 115 of the conveyor 104, which tensions the round belt 110.

Reference numeral 111 indicates the support shaft 11 so as to be interlocked with the belt pulley 109.
sprocket which is rotatably supported relative to 4 and is driven and rotated by a chain 112.

Then, when the chain 112 is rotated in the direction of arrow D,
Sprocket 111, belt wheel 109, belt 110,
Bells 1 to 10 of the conveyor 104 via the belt pulley 108
4a rotates in the feeding direction E. However, the sprocket 111 is connected to the support shaft 103 by the one-way clutch 111a.
Since the rotation of the chain 112 is not transmitted to the sprocket 111, the belt 1 of the conveyor 104
04a does not rotate in reverse.

In Fig. 1.6.7, 45 is the film conveying device 1.
A belt conveying type product supply device 150 is installed below the machine frame both inside and outside. Reference numerals 150 are guide rods placed in parallel so as to extend in the front and back direction on both left and right sides of the product supply device 45. A support shaft 151 rotatably supported on both the front and rear sides of the left and right sides of the device 45 and a link 152 rotatable integrally are rotatably supported. 1
53A is a first potentiometer (item width detection sensor) attached to one side of the article supply device 45, and a rotation operation shaft 154 interlocked with this potentiometer extends in the left-right direction on the lower surface of the article supply device 45. The rotary operation shaft 154 has a left-hand threaded portion 154a and a right-handed threaded portion 154b.

Reference numeral 155 denotes a moving block screwed onto both the left and right threaded portions 154a and 154b, and a link 156 is rotatably supported between the support shaft 151 and a lever 151a which can rotate integrally therewith. . Then, when the handle 157 of the rotation operation shaft 154 is turned, the movable blocks 155 on the same shaft 154 move toward and away from each other, and both guide rods 150 on the article supply device 45 also link 156 and support shaft 151.
and move toward and away from each other via the link 152, and the rotational displacement of the rotational operation shaft 154 is transmitted to the first potentiometer 153A. Therefore, when the guide rods 150 are aligned with the left and right edges of the article W placed on the article supply device 45, a detection signal proportional to the distance between the guide rods 150, that is, the width of the article W in the left-right direction, is detected by the first potentiometer. The meter 153A is designed to detect this. The article width detection means 153 is constituted by the guide rods 150, the first potentiometer 153A, the rotating operation shaft 154, the moving block 155, and the like.

As shown in FIGS. 3 and 5, 158A is a second potentiometer (position detection sensor) installed on the support plate 83 corresponding to one end of the threaded rod 140. 160. When the threaded rod 140 is rotated by the electric motor 141A, the rotational displacement of the threaded rod 140 is transmitted to the second potentiometer 158A. Therefore, the second potentiometer 158 detects a detection signal proportional to the distance N between the left and right support members 828.

Then, the position detection means 1 of both the left and right folding members 82 is operated by the threaded rod 140 and the second potentiometer 158, etc.
58 are configured.

As shown in Fig. 1.6.7, reference numeral 46 denotes an article holder device which is moved up and down between the inner end of the article supply device 45 and the face packaging section S and the folding section R, and is tiltable. A plurality of biased loading tables 46a are provided, and the article W is transferred from the article supply device 45 and placed thereon at the lowest initial position, and is positioned by a stopper 47.

In addition, in FIGS. 1 and 2, reference numeral 26 denotes a front presser member 3 attached to the surface side of the packaging section S of the packaging film conveying device 1;
Reference numeral 7 denotes a rear holding member which is also attached to the rear side, and both front edges of the packaging film F stretched over the packaging section S are held by these holding members 26° and 37. Reference numeral 43 denotes a saw blade mounted near the film supply port P of the packaging film conveyance device 1, and is configured to form perforations at intervals of a certain length of the packaging film F during conveyance. Reference numeral 48 denotes a heater device on which the equipment constituted by the front folding member 89 is placed.

Next, we will discuss the electrical configuration of the packaging machine configured as described above.

In FIG. 8, a microcomputer 170 is composed of a central processing unit (hereinafter referred to as CPIJ) 171, a program memory 172 consisting of a read-only memory (ROM), and a working memory 173 consisting of a readable and rewritable memory (RAM). It is built into a control box (not shown) installed in the equipment to be installed.
U171 operates based on a control program stored in program memory 172. The program memory 1
In 72, the control program specifies that when the unwrapped item W is sent to the folding section R, the optimal left and right folding is performed according to the width of the item W in the left and right direction between the left and right folding members 82. Position data of the member 82 is stored in advance (storage means)
. That is, the value obtained by dividing the width of the item W in the horizontal direction into certain ranges is 1.1. L2...(L1<L2)
When, the distance N (position data) between the left and right support members 828 is N1.N2...(N1<N2
) is now selected.

The first potentiometer 153A serves as an article width sensor. In other words, as I did before,
When both the guide rods 150 are placed on both the left and right edges of the article W placed on the article supply device 45, a detection signal from the first potentiometer 153A proportional to the width of the article W in the left and right direction is input to the CPU 171. It looks like this. And C
The PU 171 calculates the horizontal width of the article W based on this input signal (first indexing means).

This calculation result is temporarily stored in the working memory 173.

Further, the second potentiometer 158A serves as both left and right folding member position detection sensors. That is, as described above, the detection signal of the second potentiometer 158A, which is proportional to the distance N between the left and right support members 82a, is transmitted to the CPU 1.
71. And CPU17
1 calculates the interval N based on this input signal (second indexing means). This calculation result is temporarily stored in the working memory 173.

Further, the CPU 171 controls the left and right support members 8 for the left and right width of the item W stored in the working memory 173.
28 is read from the program memory 172, this position data N is compared with the position data N from the working memory 173, and the electric motor 141A is drive-controlled so as to make them coincide. (drive control means). That is, with this drive control,
As shown in FIG. 3, when the width of the article W in the left and right direction is large, the distance N also becomes large, and conversely, as shown in FIG. 5, when this width is small, the space N also becomes small.

In addition, since it is necessary to select the film length according to the width of the article W in the left-right direction, the article width detection means 153 selects an arbitrary film length according to the width of the article W in the left-right direction. It is also possible to input a detection signal from the dial corresponding to the film length to the CPU 171 by using a film length setting dial that can be used.

Next, an outline of the actual packaging operation will be explained.

Before operation, when an item W (a tray containing items) is placed on the item supply device 45 and both guide rods 150 are aligned with the left and right edges of the item W, as described above, the width of the item W in the lateral direction is The distance N between the left and right support members 82a is adjusted accordingly.

Next, the article W is transferred by driving the article supply device 45 and placed on the pedestal device 46 that has moved downward. At this time, the rear folding member 77 is moved backward by the upward movement of the interlocking rod 96.

When the film transport device 1 is driven in synchronization with this feeding, the starting end of the packaging film F located at the supply port P is transported toward the packaging section S at the center of the transport device 1. On the way, perforations in the width direction are formed by the sawtooth 43 at every fixed length of the packaging film, and an instantaneous brake is applied at the supply port P to pull the packaging film F. It is cut at the perforations and conveyed to the top of the packaging section S.

The packaging film on the packaging section S is held by both front and rear pressing members 26.3.
It is clamped by the upward motion of 7.

Next, when the pedestal device 46 moves upward and the product W pushes up the packaging film F, the product W pushes up the packaging film F T-m
be exposed.

Thereafter, when the interlocking rod 96 moves downward as the pedestal device 46 moves upward, the rear folding member 77 in the backward IQ position moves forward. Along with this forward movement, the left and right folding members 82 also approach each other.

Next, the rear folding member 77 and both left folding members 82 are inserted into the product W.
When the pedestal device 46 moves downward again, the packaging film F is folded under the product W from both rear and right and left directions while the product W is placed on the rear folding member 77. In synchronization with this folding operation, the clamping by the rear presser member 37 is released, and only the clamping by the front presser member 26 is maintained.

Thereafter, when the belt 104a is rotated and the clamping by the front pressing member 26 is released, the article W is conveyed forward and transferred from the rear folding member 77 onto the front folding member 89. During the transfer, the packaging film F hits the front folding member 89 on the lower side of the item W and is folded in from the front, and the folding from the rear is overlapped with the folding from both left and right directions, and the folding from the front is further overlapped.
The folding part is on the bottom side. Next, the interlocking rod 96 is moved upward again and the rear folding member 77 is moved back, and the left and right folding members 82 are opened to each other as the rear folding member 77 retreats.

The repackaged product W is carried out to the heater device 48, where the folded portions are brought into close contact with each other and one process is completed.

Note that when the article width detection means 153 of the article supply device 450 is operated during operation, the left and right folding members 82 operate at the adjusted positions from the next step.

As described in detail above, in this embodiment, both the left and right support members 82
Since the distance N between a can be adjusted, the positions of the left and right folding members 82 can be selected depending on the width of the article W in the left and right direction.

For example, as shown in FIG. 3.5, even if the width of the article W changes in the lateral direction, the distance between the left and right folding members 82 and the left and right edges of the article W can be kept almost constant. As a result, the left and right folding members 82 for both left and right sides of the lower surface of the item W
The penetration dimension can be made almost constant, and the packaging condition becomes uniform and good regardless of the width of the article W in the left-right direction.

Further, the optimum interval N can be automatically selected based on the program memory 172 according to the width of the article W in the left and right direction, and the work of adjusting the position of the left and right folding members 82 is greatly facilitated.

In addition, in the above embodiment, the drive ff of both the left and right support members 82a
As fl141, in order to automate the position adjustment work of the left and right side folding members 82 according to the width of the item W in the left and right direction,
Although the electric motor 141A is used, manual adjustment means such as a handle may also be used. However, in this case, automation of the same position adjustment work is not considered.

Effects of the Invention In short, according to the first invention, the positions of the left and right folding members 82 can be selected depending on the width of the article W in the left and right direction, and a good packaging state can be obtained.

Further, according to the second invention, in addition to the effects of the first invention, the positions of the left and right folding members 82 can be automatically selected based on the stored data according to the width of the article W in the left and right direction. The work of adjusting the positions of the left and right folding members 82 becomes very easy.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view showing the side surface of a fresh food packaging machine using the packaging film folding device according to the present embodiment, and FIG. 3 and 5 are schematic plan views showing the folding device, FIG. 4 is a partial sectional view showing the interlocking mechanism (M) of the folding device, FIG. 6 is a plan view showing the article feeding device, and FIG. 7 is a schematic plan view showing the folding device. A sectional view showing the side of the device,
FIG. 8 is an electrical block circuit diagram.

Claims (1)

[Claims] 1. Rear folding members (7
7), a front folding member (89), and left and right folding members (82) supported rotatably in the left and right directions on both left and right sides of the rear folding member (77).
, 77, 82), each folding member (89, 77, 82)
are approaching each other and wrapping the packaging film (F) against the item (W).
) in a packaging film folding device having a folding part (R) for folding, the rotation fulcrum (84) of the left and right folding members (82) that maintain a constant interval (M), and the left and right folding members (84) that can be moved toward and away from each other. A support member (82a), a drive mechanism (141) for moving the left and right support members (82a) toward or away from each other, and guide pins (
147) so as to be movable in the left-right direction, a guide groove (146) is formed in a guide plate (143) extending from both support members (82a), and a guide pin (147) is formed in this guide groove (146). At the same time, the guide pin (147) and the left and right folding members (82) are connected to each other
49) A packaging film folding device for a packaging machine, comprising: an interlocking mechanism that rotatably supports and interlocks these. 2. The drive mechanism (141) has a left threaded portion (140a) and a right threaded portion (
140b), one support member (82a) is screwed to the left-hand threaded portion (140a), and the other support member (82a) is screwed to the right-hand threaded portion (140b), and this threaded rod (140 ) is rotatable by an electric motor (141A), the packaging film folding device in a packaging machine according to claim 1. 3. Rear folding members (77
), a front folding member (89), and left and right folding members (82) supported rotatably in the left and right directions on both left and right sides of the rear folding member (77), and these front and rear, left and right folding members (89,
77, 82), each folding member (89, 77, 82) approaches each other and wraps the packaging film (F) against the item (W).
In a packaging film folding device having a folding part (R) for folding, the left and right folding members (82) have rotational fulcrums (84) that maintain a constant interval (M), and left and right supports that can move toward and away from each other. The member (82a), a drive mechanism (141) for moving the left and right support members (82a) toward or away from each other, and guide pins (
147) so as to be movable in the left-right direction, a guide groove (146) is formed in a guide plate (143) extending from both support members (82a), and a guide pin (147) is formed in this guide groove (146). At the same time, a link (14) is formed between the guide pin (17) and both left and right folding members (82).
9) and an interlocking mechanism that rotatably supports and interlocks these, and a linkage mechanism that corresponds between the left and right folding members (82) when the unpackaged item (W) is sent to the folding section (R). Goods (W)
storage means (172) for storing in advance position data (N) of both the left and right folding members (82) according to the lateral width (L) of the unwrapped item (W); an article width detection means (153) for detecting; a first indexing means (171) for calculating the horizontal width (L) of the article (W) based on a detection signal from the article width detection means (153); a position detection means (158) for detecting the positions of the left and right folding members (82); and a second part for calculating the positions of the left and right folding members (82) based on the detection signal from the position detection means (158). The item (W) calculated by the dispensing means (171) and the first indexing means (171)
The position data (N) of the left and right folding members (82) with respect to the horizontal width (L) of the left and right folding members (82) is read out from the storage means (172), and the left and right folding members (82) calculated by the second indexing means (171) ) position data (N) is stored in the storage means (1
72) A packaging film folding device for a packaging machine, comprising: a drive control means (171) for driving and controlling the drive mechanism (141) so as to match the position data (N) read from a packaging machine.