JPH04339727A - Packaging film pull-out device for packaging machine - Google Patents

Abstract

PURPOSE:To complete the adjusting motion quickly by a method wherein a control arm is directly or indirectly connected to be turnable with a pull-out arm which rocks by the rotation of a cam and a film gripping member respectively, and the turning quantity of the control arm is set. CONSTITUTION:At the initial position, a major arm 71 is set at its returned position to the maximum, and a control mechanism 32 is set at a specified position of a pull-out arm 30 at which a control arm 72 and a link 72a are extended to the maximum, and a specified position detector 82 is set under a condition in which the detector 82 detects a flag 83. When a cam 70 turns, the pull-out arm 30 swings to a film pull-out position, and makes a gripping member 31 advance to a film feeding position of a film feeding device D and grip a film 25a or 25b. This film gripping is performed by timing of a major timing disk when the major arm reaches the foremost end by the cam 70, detection of the flag 83 by the specified position detector 82 and completion of measurement of a object-to-be-packaged, and the film is gripped, and a specified quantity of the film is pulled out by a returning motion of the pull-out arm 30.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging film drawing device for a packaging machine, and more particularly to an improvement in means for adjusting the amount of film drawn out of the film drawing device.

0002

[Prior art and its problems] A packaging film drawing device for a packaging machine has a film gripping member that can be horizontally reciprocated by a guide member, and the drawing arm is rotated at the tip of a main arm that swings by rotation of a cam. The film gripping member, which is movably attached and connected to the rotating end of the pull-out arm to the film gripping member and reciprocated by the rotation of the cam, picks up the leading end of the film supplied from the film supply device at its forward end. The film is gripped and pulled out a predetermined length by a backward motion. In the above packaging machine, it is necessary to change the amount of film drawn out depending on the size of the product, more specifically, the height and length of the product.
Conventionally, in order to adjust the amount of rotation of the drawer arm, there is a known device in which one end of the link is moved by rotation of a motor, and the drawer arm connected to the other end is rotated, thereby adjusting the amount of film being drawn out. (Japanese Unexamined Patent Publication No. 163112/1983).

However, in the conventional device, a screw member attached to the lower end of the link is attached to the propeller shaft that forms the screw connected to the motor, and the lower end of the link is slid by forward and reverse rotation of the propeller shaft to rotate the pull-out arm. It is configured to move.

However, in the conventional device, since the screw member is slid by the rotation of the propeller shaft, the amount of movement of the lower end of the link, that is, the amount of movement of the tip of the drawer arm, does not match the rotation of the motor (one-to-one relationship). (cannot be set), the response is poor, and it takes time to start the subsequent packaging operation, making it impossible to increase the speed of the packaging machine.

In order to solve these conventional problems, the present invention improves the responsiveness of the adjustment operation when changing the amount of film to be drawn out so that the adjustment operation can be completed quickly, thereby keeping up with the increase in the speed of the wrapping operation. The purpose is to provide a packaging machine with high processing capacity.

[0006]

[Means for Solving the Problems] The film drawing device of the present invention includes a main arm that swings due to cam rotation, and a tip of the swingingly attached drawing arm that is connected to the film gripping member. and a rotatable control arm is rotatably connected to the drawer arm directly or indirectly to the main arm, and the rotary shaft of the control arm is linked to a power source to correspond to the amount of rotation of the control arm. It is characterized in that the amount of rotation of the drawer arm is set by

[0007] According to a second aspect of the present invention, in the above device, a pull-out arm swings by rotation of the cam, and a control arm is rotatably connected directly or indirectly to the pull-out arm and the film gripping member. , a motor is connected to the rotation shaft of the control arm, and the amount of rotation of the control arm is set by the motor.

[0008]

[Operation] According to the present invention, when the rotation axis of the control arm is directly or indirectly rotated by the rotation of the power source to adjust the distance between the main arm and the drawer arm, and the main arm is thereby swung. The amount of rotation of the drawer arm, that is, the amount of film drawn out.

According to claim 2, the control arm is rotated via the rotation shaft by the rotation of the motor to adjust the positional relationship between the drawer arm and the gripping member, and the control arm is rotated by a certain amount of rotation of the drawer arm. On the other hand, the end position of the backward motion of the gripping member is adjusted to change the amount of film extraction.

0010

[Embodiment] An embodiment of the present invention will be described with reference to the drawings. In FIGS. 1 to 4 showing the overall configuration of a packaging machine, reference numeral A is a supply device for a product a to be packaged, B is a weighing conveyor device,
C is an elevator conveyor device, D is a film supply device, E is a film pull-out device, F is a film clamp device, G is a film folding device, and H is a take-out conveyor device.

[0011] The feeding device A is detachably disposed on the front surface of the main machine frame 1, is provided with a supply conveyor 2, and works together with a width adjusting device 3 attached to the main machine frame 1. The supply conveyor 2 is a belt conveyor that carries the product a into the main machine frame 1, and is rotated by power transmission through a motor M1, a timing pulley 4, and a timing belt 5. When the power is turned on, the motor M1 starts and the supply conveyor 2 is constantly driven, and is temporarily stopped when the product detector 6 installed at the end of the conveyance detects the product a being transported. state, and the width adjustment device 3 is activated.

As shown in FIGS. 1 and 2, the width adjusting device 3 installed at the entrance of the packaging machine main body is provided with a timing belt 7 rotated by a motor (not shown) on each opposing side 7a,
7b, width shifting plates 8, 8 are hung down with a left and right interval, and as the belt 7 rotates, both width shifting plates 8, 8 simultaneously approach or move away from the center in the width direction of the supply conveyor 2. At the same time, a sensor 9' detects the amount of movement of the timing plate 9, which moves together with the width shifting plate. When the width shifting plates 8, 8 approach, they come into contact with both side edges of the product a which has reached a predetermined position on the supply conveyor 2 and is stopped. Even in the case where one of the width shifting plates 8
At this time, the product a is shifted widthwise towards the center, and finally both width shifting plates 8, 8 come into contact with both side edges of the product a to move the product a to the center position (centering). Further, a sensor (not shown) detects the point in time when the both width shifting plates 8, 8 come into contact with both side edges of the product a, and the timing plate 9 up to that point is detected.
The width dimension of the product a is detected by measuring the moving distance of the product a, and the timing belt 7 is rotated in the opposite direction to move the width adjusting plates 8, 8 in the direction of separating them and return them to the original position.

[0013] This width adjustment device 3 was developed in the applicant's earlier application (
It is disclosed in Japanese Patent Application Laid-Open No. 63-96008).

[0014] The weighing conveyor device B is disposed subsequent to the feeding device A, and is composed of a belt conveyor 10 and a weight detector 11 equipped with a weighing pan 11'.

The belt conveyor 10 is constructed by rotatably arranging a plurality of endless belts between weighing pans 11' formed in a divided shape, and its front end is disposed close to the rear end of the supply conveyor 2. , After centering, supply conveyor 2
The weighing pan 11' receives the product a conveyed by the
Move it upwards. Further, the belt conveyor 10 is connected to arms 13, 13, etc., which rotate by an air cylinder 12, and can move up and down by the rotation of the arms 13, 13, etc. In the upward movement position, the upper side of the belt conveyor 10 is It is positioned above the weighing pan 11', and is positioned below the weighing pan 11' in the lower movement position. Therefore, the belt conveyor 10 is in its upward movement position and is in a state where it can transport the product, and when it is lowered, the product a is transferred to the weighing pan 11'.
It is loaded on top and weighed by the weight detector 11. A product detector 14 is installed above the rear part of the weighing pan 11', and when the detector 14 detects the product a that has reached the weighing pan 11' by the belt conveyor 10, the cylinder 12
The belt conveyor 10 is lowered by operating the weighing pan 1.
The product a is weighed at the same time as it is placed on the product a.

Further, a plurality of detectors 15, 15' consisting of transmission type sensors are installed at vertical intervals above the front end of the belt conveyor 10, that is, at the entrance of the weighing conveyor device B, so that the product a 2 onto the belt conveyor 10, the height of the product a is detected depending on which of the detectors 15 and 15' performs the detection operation. Further, the length of the product a is detected by measuring the time from when the front end of the moving product a is detected by the lower detector 15' until the same detector 15' detects the rear end of the product a.

Therefore, while the product a is being conveyed from the supply conveyor 2 onto the weighing pan 11', the width of the product is detected by the width adjustment device 3, and the height and length are measured by the detectors 15, 15'. When detected, based on this detection result, the elevator head of the elevator/conveyor device C, which will be described later, is selected, the film is selected by the film supply device D, the amount of film to be drawn out by the drawer device E is selected, and the clamp position of the clamp device F is set. And the film folding conditions, that is, the operation timing of the clamp device F are determined. In the embodiment, a case will be described in which the width, height, and length of the product are determined in two stages, large and small, but it is also possible to detect and control the product in multiple stages.

The elevator/conveyor device C is disposed subsequent to the weighing conveyor device B, and is composed of a conveyor 16, an elevator mechanism 19 having an elevator head 17, and a support rod 18.

The transport conveyor 16 is rotatably installed with a plurality of endless belts arranged at intervals, and the belts are arranged alternately so that their leading ends overlap the rear end of the belt conveyor 10. The drive shaft 20 driven by the motor M2 is used as a common drive source so that both conveyors 10 and 16 rotate or stop at the same time. This conveyor 16 carries the product a, which has been weighed on the weighing pan 11' of the weighing conveyor device B, to the belt conveyor 16.
Inheriting what was conveyed to the rear end by
is transferred onto the elevator head 17.

The elevator head 17 is divided and arranged between each belt of the conveyor 16, and the products a conveyed onto the head 17 are moved up and down by the support rods 18, which are connected via a support member. It is raised to the upper packaging section R for packaging. Above elevator head 1
7, stoppers 21 are arranged in an upright manner at regular intervals, and the product a introduced onto the elevator head 17 by the conveyor 16 is positioned in the correct posture with its front end abutting against the stopper 21. Then, the product a is stopped, that is, the front end of the product a is positioned, and the product a is introduced onto the elevator head 17.

In the elevator mechanism 19, the support rod 18 is moved up and down by an elevator drive mechanism 19A including a cam 22, a cam floor 23, a swing arm 24, and the like.

The film supply device D is disposed on the back of the main machine frame 1, and has film rolls 25A of different widths in upper and lower stages, each of which is a roll of stretch film used as a packaging material.
25B and a support roller 9 that supports this film roll.
0a, 90b and film feeding rollers 26a, 26b
and a supply frame 27 having two supply ports 27a and 27b (FIGS. 1 and 3). Above film roll 2
Films 25a and 25b pulled out from 5A and 25B are delivered to the supply frame 2 via feed rollers 26a and 26b, respectively.
The tips are held at the respective supply ports 27a and 27b of 7. This supply frame 27 is moved up and down by an air cylinder 28,
Film 25a or 25b selected in relation to product width
the supply ports 27a, 27b are moved to predetermined supply positions. The supply ports 27a and 27b are comb-shaped and allow the film to be easily gripped by a film drawing device, which will be described later.

The feeding rollers 26a, 26b feed the film 25a or 25 from the film roll 25A or 25B.
A timing belt 29a and a timing pulley 29b for driving a film unwinding device, which will be described later, and a chain 29c that transmits the power of the timing belt 29a to unwinding rollers 26a and 26b via an electromagnetic clutch 29d. Feeding roller 26
a, 26b are rotated, and support rollers 84a, 84b are driven by a rubber belt via an electromagnetic brake 29e, and as the feed rollers 26a, 26b are rotated, the film roll 2 is rotated.
Rotate 5A and 25B to feed out the film. After the film is fed out, the electromagnetic brake 29e prevents the film from returning, and since the electromagnetic brake 29e operates in a non-excited state, the leading edge of the film at the film supply port can be held even if the main power is cut off. Therefore, the next film can be fed out smoothly. In addition, the supply port 27a,
In order to hold the leading end of the film after cutting at the leading end of the supply port, it is preferable that the film 27b is subjected to a surface treatment such as a mirror finish to improve the adhesion of the film. Further, the film feed rollers 26a and 26b are also subjected to surface treatment to improve film adhesion in order to ensure that the films 25a and 25b are fed out from the film rolls 25A and 25B.

The film drawing device E is disposed at the front of the main machine frame 1 facing the feeding frame 27 of the film feeding device D, and is moved based on the rotation of a feeding cam 70 fixed coaxially with the cam 22. It is constructed by connecting a swinging arm 30 to a gripping member 31 that can be opened and closed. The gripping member 31 has a comb-shaped tip whose tip corresponds to the supply ports 27a and 27b, and performs a reciprocating motion of approaching and retreating toward the supply frame 27 as the arm 30 swings, and is held in an open state during the forward movement. The supply port 27a or 27 that approaches the supply frame 27 and is in the supply position
The tip of the film 25a or 25b of b is gripped by the closing motion and a predetermined length of the film is pulled out by the backward motion. Further, the above-mentioned drawing device E has the above-mentioned arm 30 and cam 2.
2, the withdrawal amount control mechanism 32 is interposed between the product a
The retracted position of the gripping member 31 is set in accordance with the film pull-out amount set by detecting the height and length of the gripping member 31. Incidentally, the film drawn out by the drawing device E is cut by a cutter 33 installed immediately in front of the supply frame 27 and separated from the succeeding film. The film drawing device E will be described in more detail later. The film clamp device F clamps and supports the trailing edge and left and right side edges of the film 25a or 25b drawn out by the drawing device E.
The rear clamp abutment plate 34, left and right clamp abutment plates 35, 36, and air cylinders 37, 38a, 38b shown in FIGS. 1 and 3.
It is composed of clamp plates 34a, 35a, and 36a that move up and down to approach and separate from each of the abutment plates 34, 35, and 36. Both the left and right clamp mechanisms 35, 35a, 36, 36a are configured to be able to approach or expand by a predetermined amount in the width direction by a motor M3, levers 39, 39', and a timing disc 40 shown in FIG. When the films 25a and 25b are selected in accordance with the width detection of the product a by the width adjustment device 3, the clamping mechanisms 35, 35a, 36,
The width position of 36a is set.

The folding device G is arranged above the film drawn out by the drawing device E to form a packaging section, and is opened and closed in the width direction by drive sections 41 and 41' as shown in FIGS. 1, 3 and 4. Left and right folding plates 42 and 42' that move, a front folding plate 44 that reciprocates back and forth by a drive unit 43 and a lever 43a, a pusher 46 that reciprocates back and forth by a drive unit 45 and a lever 45a, a rear folding roller 47, and a folding roller 47 that can freely swing up and down. It is constituted by an upper surface pressing member 48. The upper pressing member 48 is attached to the inner upper surface of the lid case by a parallel link mechanism, and when the lid case is opened, the pressing member 48 also rises together with the lid case, making maintenance inspection and cleaning around the packaging position easy. Moreover, the height of the lid case can be pushed down by the parallel link mechanism. In addition, since the packaged items are pressed from directly above, the operation of the pusher and folding plate can be maintained in a stable state. This folding device G includes the left and right folding plates 42, 42', the front folding plate 44, and the pusher 46.
The film 25 is wrapped by a known wrapping operation in which
A or 25b is used to stretch wrap the product a, and the pusher 46 discharges the wrapped product a' to the unloading device H, that is, the wrapped product a' is discharged in the same direction as the carry-in direction of the product a. It is.

The unloading device H forms a conveyance path for unpacking the packaged product a', and is disposed at the upper part of the back of the main machine frame 1, and the unloading device H forms a conveyance path for transporting the packaged product a'. is transported to a predetermined position, and while the product is being transported, a label with required data printed thereon is issued by a label printer and is pasted onto the product a'.

Further, in FIG. 1, the symbol M is the main motor, 6
1 is a main timing disc, and its main motor M outputs a weighing stability signal when the weight detector 11 of the weighing conveyor device B completes weighing of product a, that is, when the main motor M is stopped. Starts when the main timing board 6
1, the weighing conveyor device B, which is the main body part of the packaging machine,
The timing of each operating section of the elevator/conveyor device C, film supply device D, drawer device E, clamp device F, folding device G, and carry-out device H is controlled. Specifically, the width of the product a is detected by the width adjustment device 3 of the supply device A, and the height and length of the product are detected by the detectors 15 and 15' of the weighing conveyor device B. Based on this, the operation timing of each part, such as the selection of the auxiliary elevator head, the selection of the film rolls 25 and 25' to be supplied, the determination of the left and right clamp positions, the operation timing of the left and right clamp plates 35a and 36a, and the control mechanism for the amount of film drawn out, is controlled. , the vertical movement of the belt conveyor 10 by the main timing disc, the cutter 33, the left and right folding plates 42,
42', controls the operation timing of the packaging mechanism section, such as the operation of the front folding plate 44, the pusher 46, and the activation of the carry-out roller conveyor 50. Incidentally, the upward movement of the belt conveyor 10 of the weighing conveyor device B is started by the output of the weighing stability signal of the weight detector 11 and the main timing plate 61 to convey the product a toward the conveyor 16, but the upward movement of the belt conveyor 10 of the feeding device A The drive motor M1 of the supply conveyor 2 does not start unless centering is completed by the width adjusting device 3.

In the above embodiment, the product a is carried to the supply conveyor 2 according to the activation timing of the main motor M, and
It will be understood that the timing until the measurement is completed is completely unrelated to the subsequent timing of the packaging machine itself. Therefore, the supply device A can be freely changed depending on the usage conditions of the packaging machine, for example, the packaging machine can be placed in an automated line.

In FIG. 4, reference numeral 62 is a console section through which required data and commands are input, and the supply device A
It is installed on the upper surface of the side of the main machine frame 1 so as to face the worker located nearby.

Next, FIG. 4 is a side view (left side view) opposite to FIG. 1, and the film drawing device E will be described in detail using this figure.

In the figure, reference numeral 32 denotes a film draw-out amount control mechanism, which adjusts the amount of rotation of the draw-out arm 30 connected to the film gripping member 31. The control mechanism 32 includes a cam 70 mounted coaxially with the cam shaft 22b that rotates the cam 22, a main arm 71 that swings by the cam 70, a control arm 72, a link 72a, an auxiliary motor 73 as a power source, and a timing belt 74. and a fixed position detector 82 of the control arm 72.

The main arm 71 has its lower end pivotally attached to the bottom of the main machine frame 1 so as to be able to swing freely, and a cam floor 75 attached approximately at the center is engaged with the cam groove 70a of the cam 70, so that the cam The rotation of 70 causes it to swing in the front-rear direction (left-right direction in FIG. 4). One end of a control arm 72 is connected to the upper end of the main arm 71 by a rotation shaft 76, and a link 72a is rotatably connected to the other end of the control arm 72.
2. Connect the main arm 71 and the drawer arm 30 via the link 72a.

The control arm 72 and the link 72a are rotatably connected by a shaft 77, and when the control arm 72 rotates as the rotation shaft 76 rotates, the intersection angle between the control arm 72 and the link 72a changes. The distance between the main arm 71 and the drawer arm 30 is adjusted by expanding and contracting the distance between both ends.

The auxiliary motor 73 is installed near the lower end of the main arm 71, and a timing pulley 78 is attached to the motor shaft 73a, and the timing belt is connected between the pulley 78 and a timing pulley 79 attached to the rotating shaft 76. 7
4, and the rotating shaft 76 is rotated via the timing belt 74 by driving the auxiliary motor 73.

A fixed position detector 82 is arranged near the timing pulley 78, and a flag 8 attached to the motor shaft 73a
3, it is detected that the drawer arm 30 is separated from the main arm 71 by the maximum distance. The drawer arm 30 has its lower end rotatably erected on the bottom of the main machine frame 1 by a support shaft 80, and its upper end is connected to the gripping member 31 via a link 81, and the gripping member 31 is connected in the front-rear direction. It is slidably supported by guide members 100, 100 extending horizontally to the film feeder D, and reciprocates horizontally in the direction of the film supply device D in conjunction with the swinging of the drawer arm 30.

The drawer arm 30 is placed at the initial position P in FIG. The control mechanism 32 has a control arm 72 and a link 72.
The position detector 82 is set to detect the flag 83 when the drawer arm 30 is in its home position with the drawer arm 30 extended to its maximum extent (indicated by the two-dot chain line in the figure). When the cam 70 rotates, the pull-out arm 30 swings to the film pull-out position (position Q in the figure), moves the gripping member 31 forward to the film supply position of the film supply device D, and at this position, the gripping member 31 is moved forward to the film supply position. grip the film 25a or 25b. The film is gripped and pulled out based on the timing of the main timing disc by the cam 70 when the main arm reaches the front end, the detection of the flag 83 of the fixed position detector 82, and the completion of weighing the packaged object. A predetermined amount of film is pulled out by the backward movement of the arm 30.

When the gripping member 31 grips the film, the main arm 71 swings due to the rotation of the cam 70, causing the drawer arm 30 to swing in the return direction, and the auxiliary motor 7
3 starts rotating counterclockwise (reversely) and stops after rotating until the main timing disc 61 reaches the timing position corresponding to the film draw-out amount set by detecting the height and length of product a.

Therefore, although the main arm 71 swings through a constant stroke due to the rotation of the cam 70, the drawer arm 30
On the return path, the control arm 72 swings an amount corresponding to the rotation angle of the control arm 72 due to the rotation of the auxiliary motor 73, and the amount of film drawn out by the return movement of the gripping member 31 is adjusted.

Thereafter, when the aforementioned folding device G starts the left/right and front folding operations, the drawer arm 30 returns to its initial position as the cam 70 rotates, but when the main arm starts swinging, the auxiliary motor 73 starts clockwise. The control arm 72 is rotated in the direction until the fixed position detector 82 detects the flag 83, and the control arm 72 is in an initial state in which the drawer arm 30 is furthest away from the main arm 71.

In FIG. 4, the solid line positions of the control arm 72 and the ring 72a indicate the maximum film extraction position, and it will be easily understood that the initial position P also corresponds to the minimum film extraction position.

Furthermore, as can be seen from FIG. 4, the gripping member 31
Both ends of the above-mentioned timing belt 29a are hooked to the holder 31, and when the gripping member 31 moves back, the amount of movement is the same as that of the timing belt 29a, the timing pulley 29b, and the chain 29c.
is transmitted to the feeding rollers 26a, 26b via the
The amount of film feeding by 6b is synchronized. Note that compared to the backward movement speed of the gripping member 31, the feeding roller 2
The rotational speeds of 6a and 26b are slightly slowed down to stretch the film without wrinkles. The timing belt 29a also rotates when the gripping member 31 moves forward, but power transmission at that time is interrupted by the excitation of the electromagnetic clutch 29d described above.

Furthermore, each of the above-mentioned feeding rollers 26a, 26b
is a roller 8 on which film rolls 25A and 25B are placed.
4a, 84b and a round belt 85 to assist in feeding out the film from the film rolls 25A, 25B. Furthermore, electromagnetic brakes 29e and 29e are interposed between the feeding rollers 26a and 26b, and when the feeding rollers 26a and 26b are stopped, the electromagnetic brakes 29e and 29 are activated.
The rotation of the rollers 84a and 84b is stopped by the operation of e. When the feeding rollers 26a, 26b rotate, the electromagnetic brakes 29e, 29e are energized and the rollers 84a, 84b are rotated.
Release the stoppage of rotation.

FIG. 5 shows a second embodiment of the present invention, in which, instead of using the control arm 72, link 72a, auxiliary motor 73, and timing belt 74 described above, the rotating end of the drawer arm 30 and the gripping device are used. control arm 90
are rotatably connected.

In this embodiment, the drawer arm 30
An auxiliary motor 91 is attached to the upper end of the auxiliary motor 91, and the motor shaft of the motor 91 is configured as a rotating shaft 92 for rotating the control arm 90.

The auxiliary motor 91 rotates the control arm 90 by a predetermined amount at the same timing as the auxiliary motor of the first embodiment described above, and when the pull-out arm 30 is oscillated by a constant stroke by the cam 70 on its return path, the arm 30 The amount of film drawn out is adjusted by adjusting the stopping position of the gripping member 31 in relation to the above.

In this second embodiment, reference numeral 93 is an elongated hole provided in the control arm 90, and the drawer arm 30 has a cam floor attached thereto to engage with the cam groove 70a of the cam 70. The main arm 71 can be omitted by allowing the drawer arm 30 to swing directly by the rotation of the main arm 71. In this case, it is also possible to connect the control arm 90 to the gripping device via a link.

FIGS. 6 and 7 show details of the gripping member 31. The gripping member 31 connects the connecting member 102 across sliders 101, 101 which are slidably attached to the guide members 100, 100, and has an upper fixed gripping plate 103 attached thereto, and is opposed to the fixed gripping plate 103. A movable gripping plate 104 is attached to the lower surface of the gripper so as to be able to swing vertically. The tips of the fixed gripping plate 103 and the movable gripping plate 104 form a comb-teeth shape.

The movable gripping plate 104 is arranged into three parts, a central gripping plate 104a having approximately the same width, and left and right gripping plates 104b, 104b. The grip plates 104b, 104b are fixed to the rotating shaft 106 in a protruding manner.

The rotation shafts 105 and 106 are connected to the connecting member 10.
Bearings 107 and 108 attached to 2 and the slider 101
The arm 1 is rotatably supported on an arm 109', whose rotation shaft 105 is connected to an arm 109' operated by an air cylinder 109, and whose rotation shaft 106 is operated by an air cylinder 110.
Connect to 10'. Each air cylinder 109, 110
By this operation, the center gripping plate 104a and the left and right gripping plates 104b can be individually swung via the rotation shafts 105 and 106. Note that gripping members such as felt are bonded to the tips of the fixed gripping plate 103 and the movable gripping plate 104.

The gripping member 31 is attached to the drawer arm 30.
In the initial position, the movable grip plate 104 is in the lower position,
That is, when both gripping plates 103 and 104 stand by in an open state and the pull-out arm 30 swings to reach the film gripping position (see FIG. 8), the film 25a located at the supply port 27a or 27b of the film supply frame 27 is released. or 25b,
By simultaneously moving the movable gripping plates 104a, 104b, and 104b upward, both the gripping plates 103 and 104 grip the object.

Further, at the film draw-out position, the gripping member 31 synchronizes with the left and right folding operations of the folding device G, and after the left and right gripping plates 104b, 104b open first, it synchronizes with the operation of the front folding plate 44 after a slight delay. Central grip plate 104
A moves to open.

As can be seen from FIG. 8, the supply frame 27 of the film supply device D is attached to the upper end of the rod of the air cylinder 28 by fixing the lower guide frame 112 via the mounting plate 111, and the upper guide frame is mounted on the lower guide frame 112. 113, and further a cover frame 114 is attached to the upper surface of the guide frame 1.
Guide rollers 115 and 116 are provided at 12 and 113, respectively.

A lower guide plate 112a is formed at the tip of the lower guide frame 112, and a lower guide plate 112b paired with the guide plate 112a is formed on the lower surface of the tip of the upper guide frame 113.
The above-mentioned lower supply port 27b is formed by both guide plates 112a and 112b.

An upper guide plate 113a is formed at the tip of the upper guide frame 113, and an upper guide plate 113b is formed at the tip of the cover frame 114 to be paired with the guide plate 113a. An upper stage supply port 27a is formed. Note that 117 and 118 in the figure are screws for adjusting the gap between the supply ports 27a and 27b.

The upper guide frame 113 and the cover frame 114 can be opened and closed about a support shaft 119, and when loading a film, both frames 113 and 114 are opened and the leading edge of the film 25a is guided onto the lower guide plate 112a. After mounting and supporting, the upper guide frame 113 is closed, and the guide frame 113
The leading end of the film 25b is guided and supported on the upper guide plate 113a, and then the cover frame 114 is closed. This makes the film loading operation extremely easy. The object to be packaged is detected, and the supply ports 27a and 27b are moved to the supply position using cylinders depending on the size of the object. The tips of the upper and lower supply ports 27a and 27b form a comb-like shape in which the comb-like recesses of the fixed gripping plate 103 and the movable gripping plate 104 correspond to the protrusions of the respective supply ports 27a and 27b.

The supply ports 27a and 27b are subjected to surface treatment such as buffing or other mirror polishing on the inside of their guide plates 112a, 112b, 113a, 113b, so that the films 25a, 25b can easily adhere to them as described above. It's like this. When the cutter 33 pushes up the film in its cutting operation, the film at the supply port is pressed against the mirror surface and holds the leading end of the cut film. Therefore, the structure is simpler than the conventional one, and costs can be reduced. In addition, since the operation of the auxiliary motor corresponding to the amount of film drawn out is controlled by the timing of the main timing disc, the operation is more reliable and less expensive than when the operation of the auxiliary motor is controlled at a different timing. It can also be held down. Further, in the above embodiment, the main arm and the drawer arm are connected to the control arm by a link, but they may be connected only by the control arm. In that case, a long hole is formed in the drawer arm and the connection is made.

[0057]

[Effects] According to the present invention, the rotation of the power source can be directly or indirectly transmitted to the rotation axis of the control arm, and the amount of rotation of the drawer arm can be made to match the rotation of the power source. Therefore, even if the size of the items to be packaged that are continuously carried in changes, wrapping can be performed while changing the amount of film drawn out, so it can keep up with the speed increase of the packaging machine. It is possible to provide a packaging machine with high throughput.

Furthermore, according to claim 2, the main arm and the linking mechanism between the main arm and the pull-out arm can be omitted, thereby simplifying the structure and reducing the manufacturing cost.

[Brief explanation of drawings]

FIG. 1 is a side view showing the overall configuration of a packaging machine incorporating the device of the present invention;

[Figure 2] Plan view along line II-II in Figure 1,

[Figure 3
] A plan view along line III-III in FIG.

[Figure 4]
The gist of the invention is shown in a side view opposite to FIG.

[Fig. 5] A side view of main parts showing a second embodiment of the present invention,

[
FIG. 6 A partially cutaway plan view showing details of the gripping member,

7(A) is a sectional view taken along line VII-VII in FIG. 6, FIG. 7(B) is a right side view in FIG. 6,

8 is a partially enlarged side view of FIG. 4 showing the film gripping operation of the gripping member and the film supply section; FIG.

[Explanation of symbols]

30... Film drawing arm 31... Film gripping member 32... Drawing amount control mechanism 70... Cam 71... Main arm
72...Control arm 72a...Link
73... Auxiliary motor 74... Timing belt 75... Cam floor 76... Rotating shaft 90...
Control arm 91...control motor

Claims (2)

[Claims] 1. A packaging film drawing device for a packaging machine, which has a film gripping member that can be horizontally reciprocated by a guide member, and the amount of movement of the film gripping member is adjusted by rotation of an arm. A main arm that swings as the main arm rotates, and a swingably attached drawer arm whose tip is connected to the film gripping member, and a rotatable control arm that is rotatably attached to the main arm and which is rotated directly or indirectly to the drawer arm. What is claimed is: 1. A packaging film drawer, which is movably connected to the puller arm, and has a rotating shaft of the control arm linked to a power source to set the amount of rotation of the drawer arm in accordance with the amount of rotation of the control arm. 2. A packaging film drawing device for a packaging machine, which has a film gripping member that can be horizontally reciprocated by a guide member, and the amount of movement of the film gripping member is adjusted by rotation of an arm. A pull-out arm that swings when rotated by the pull-out arm, a control arm rotatably connected directly or indirectly between the pull-out arm and the film gripping member, and a motor connected to the rotation shaft of the control arm. A packaging film drawing device characterized in that the amount of rotation of the control arm is set by the motor.