JP2011006129A - Packaging bag feeder of packaging machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging bag feeder of a packaging machine, which allows for freedom in disposition of a bag height adjusting device by installing a fulcrum around which sandwiching strips are rotated on a horizontal plane, at a position far away independent of the vertical shaft of the bag height adjusting device, thereby a wide space for installing a neighboring device can be secured.SOLUTION: A bag holding part 20 has a holder 25 rotatable on a horizontal plane, on a transfer fulcrum shaft 24 provided on a bracket 23 fixed on the top end part of a vertical shaft 22, while the holder has a pair of sandwiching strips 30 provided thereon in an openable/closable manner. A bag transfer section 51 has the holder 25 moving between a relay position (y) and a position (z) to which a bag is transferred, and while the bag holding part 20 moves from the relay position (y) to the position (z) to which a bag is transferred, the height position of a packaging bag (a) supported by the sandwiching strips 30 is rectified by having a bag height adjusting device 65 raise or lower the vertical shaft 22, and thus a packaging bag (a) put in a direct-counter posture toward a pair of grips (g) by the holder 25 moving in rotation is sent on to be fed.

Description

  The present invention relates to a packaging bag supply device used for a rotary packaging machine or the like.

  In Patent Document 1, the packaging bags stacked on the stocker are sucked and separated one by one from above by a suction cup of a pair of bagmecle levers and transferred to a pair of rotating arms, and the packaging bags lifted by the arms are moved upward. The packaging bag is supplied in a posture facing the grip pair by holding the holding piece in a standby state and rotating the holding piece by a predetermined angle in a horizontal plane around a support column rotatably provided on the support block. A packaging bag supply device is disclosed.

  Patent Document 2 discloses a first transporting device that holds a bag mouth portion of a packaging bag between a suction bar and a first clamp, and transfers the packaging bag to an upper end by rotation of a swing arm, and an upper end. And a second transporting device for transferring the packaging bag sandwiched by the second clamp provided in the frame to the grip pair of the packaging machine by moving the packaging bag on the horizontal plane by the rotation of the vertical axis. ing.

  By the way, in the above-described conventional packaging bag feeding apparatus, a fulcrum position (position of a support or a vertical axis) for rotating the clamping piece or the second clamp by a predetermined angle on a horizontal plane must be provided close to the grip pair of the packaging machine. Because of the restriction that it must be done, there is a restriction that the installation space of the adjacent printing device or the like becomes narrow. And when receiving a restriction | limiting at this fulcrum position, when supplying a packaging bag from the said clamping piece to a grip pair, there exists a possibility that the side edge of the said packaging bag may contact the front-end | tip part of a grip pair.

  Further, Patent Document 1 discloses a structure in which a shift in the height position of a packaging bag that occurs at a packaging bag receiving position is corrected at a packaging bag supply station by raising or lowering a support provided with a sandwich piece. ing.

JP 2006-36325 A Utility Model Registration No. 3123709

  The object of the present invention is to provide a degree of freedom in the arrangement of the bag height adjusting device by providing a fulcrum for rotating the sandwiching piece in a horizontal plane at a position separated from the vertical axis of the bag height adjusting device. An object of the present invention is to provide a packaging bag supply device for a packaging machine that can secure a large installation space for the device.

In order to achieve the above-mentioned object, the invention described in claim 1 is to deliver the packaging bag in which the bag mouth portion of the packaging bag on the stocker is attracted and turned up by the bag mech lever to the rotary arm at the delivery position (x). A bag supply unit that lifts the packaging bag adsorbed by the suction cup provided in the rotating arm to the relay position (y), a bag gripping unit that sandwiches the packaging bag received from the bag supply unit and supports the bag in a suspended manner, and In a packaging bag supply device of a packaging machine, comprising a bag transporting unit that feeds a packaging bag in a face-to-face posture to a pair of grips of a bag transporting destination (z) that is intermittently stopped in a bag feeding process by changing the direction of the bag gripping unit ,
For the bag gripping part, a bracket is fixed to the upper end of the vertical axis supported by the first stand erected on the machine base, and a holder is provided on the transfer fulcrum shaft provided on the bracket so as to be rotatable on a horizontal plane. A pair of clamping pieces provided in the holder are provided to be opened and closed by a first drive means via a transmission mechanism,
For the bag transfer part, the holder of the bag gripping part is movably provided between the relay position (y) and the bag transfer destination (z) by the second driving means,
Further, a rotary encoder having an input shaft connected to a rotary shaft to which the rotary arm is attached, and passage of a bag mouth end of a packaging bag lifted by the rotary arm are detected at a predetermined position before the relay position (y). And the number of pulses generated by the rotary encoder at the time of passage detection by the sensor when the height of the packaging bag lifted by the rotating arm is a normal position, A control unit that determines a correction value for correcting the height position of the packaging bag by comparing and calculating the actual measurement pulse generated from the encoder and a reference pulse, and the vertical axis is controlled based on the determined correction value. A bag height adjustment device comprising a drive unit equipped with a servo motor to
While the bag gripping portion moves from the relay position (y) to the bag transfer destination (z), the packaging bag is supported by the sandwiching piece by raising or lowering the vertical axis by the bag height adjusting device. The packaging bag is supplied to the grip pair in a directly-facing posture by correcting the height position of the holder and changing the direction of the sandwiching piece by the rotational movement of the holder.

  In order to achieve the same object, the invention described in claim 2 is the packaging bag supply device of the packaging machine described in claim 1, wherein the first drive means is provided in a second stand erected on the machine base. A sub-shaft is concentrically loosely fitted into a hollow main shaft that is rotatably provided, a drive lever is fixed to the upper end of the sub-shaft, and a transmission mechanism incorporated in the free end of the drive lever and the holder A part is connected by a rod, and the auxiliary shaft is rotated clockwise and counterclockwise by a cam and lever drive mechanism to operate the transmission mechanism to open and close the clamping piece. It is characterized by being.

  In order to achieve the same object, according to a third aspect of the present invention, in the packaging bag supply device for a packaging machine according to the second aspect, the second drive means fixes a drive lever to the upper end of the main shaft. The free end of the drive lever and the arm provided on the holder are connected by a rod, and the holder can be rotated and moved by rotating the main shaft in a clockwise direction and a counterclockwise direction by a cam and lever drive mechanism. It is characterized by providing.

(Invention of Claim 1)
The packaging bag supply device of this packaging machine is provided with a fulcrum for rotating the sandwiching piece for sandwiching the packaging bag in a horizontal plane at a position separated from the longitudinal axis of the bag height adjusting device, and separated from the vertical axis of the bag height adjusting device. Since a degree of freedom is obtained in the arrangement, it is possible to secure a wide installation space for adjacent devices.
Furthermore, when the height of the packaging bag supported by the bag gripping portion is deviated from the normal position, the height can be quickly corrected and automatically adjusted to a predetermined height. It is possible to efficiently mass-produce packaged products with good quality.

(Invention of Claim 2 and Claim 3)
According to the packaging bag supply device of this packaging machine, the second stand that supports the main shaft of the second driving means and the auxiliary shaft of the first driving means can be disposed at a location away from the grip pair, so that the installation space for the adjacent device can be reduced. Widely secured.

Plan view of a packaging machine to which the present invention apparatus is applied Illustration of bag supply unit The top view which shows arrangement | positioning of the bag transfer part with respect to a grip pair, and a bag holding part Explanatory drawing which shows the mechanism of a bag holding part and a bag transfer part Explanatory drawing of the drive part of a 1st drive means and a 2nd drive means Illustration of bag height adjustment device

  The best mode of the present invention will be described below with reference to the drawings.

  A rotary type packaging machine P to which the packaging bag supply apparatus according to the present invention is applied is shown in FIG. In this packaging machine P, 16 grip pairs g are arranged at equiangular intervals in the radial direction on an intermittent rotating shaft 2 that is rotatably supported by a post (not shown) erected on the machine base 1. The turntable 3 is attached, and the turntable 3 is provided so as to be intermittently movable every 16 steps.

  By the way, this packaging machine targets “flour” as an object to be packaged, and performs rough filling (about 580 grams) and correction filling (about 20 grams) on a stand bag a that is suspended by a grip pair g. Apply and pack to a regular volume (600 grams).

  The packaging machine P includes a bag feeding process (1) for supplying a stand bag a to each grip pair g by a packaging bag supply device S, a printing process (2) for printing a production date and the like by a printing machine, and a stand bag. Opening step (5) for widening the bag mouth, rough filling step (6) for roughly filling flour with the auger device 76, bottom vibration step (7) for vibrating the bottom of the stand bag to reduce the volume of the flour inside ) To (9), a measuring step (10) for measuring the content of the coarsely filled flour by the measuring means 77, a correction filling step (11) for performing correction filling by the auger device 78, and a top for heat sealing the bag mouth It includes steps such as a sealing step (14), a cooling sealing step (15) for cooling the heat seal portion, and an out-of-system discharge step (16) for discharging the product out of the apparatus.

  The packaging bag supply device S according to the present invention delivers the packaging bag on which the bag mouth portion of the packaging bag on the stocker 6 is attracted and turned up by the bag mech lever 7 to the rotary arm 13 at the delivery position (x). 13, a bag supply unit 5 that lifts the packaging bag adsorbed by the suction cup 14 to the relay position (y), and a bag gripping unit 20 that holds the packaging bag received from the bag supply unit 5 and supports it in a suspended state. And a bag transfer part 51 for supplying a packaging bag in a face-to-face posture to the grip pair g of the bag transfer destination (z) that is intermittently stopped in the bag supply step (1) by changing the direction of the bag gripping part 20 The bag height adjusting device 65 corrects the height position of the packaging bag supported by the dressing piece 30. Hereinafter, each component will be described in detail.

(Bag supply unit)
As shown in FIG. 2, the bag supply unit 5 is provided with a pair of bag lifting levers 7 on both sides of a stocker 6 installed on the machine base 1 so as to be swingable within an angle range of about 40 °. A lever (not shown) and a part of the bag lifting lever 7 are connected by a rod 9 to a frame 11 installed on the frame 11 by a swing mechanism (not shown) using a cam and a lever. . A suction cup 8 connected to a suction pipe of a vacuum device (not shown) is provided downward at the tip of each bag mech lever 7.

  A pair of left and right rotating arms 13 having suction cups 14 attached to their tips are provided on a rotating shaft 12 supported in the horizontal direction on the frame 11 so that the distance between them can be adjusted according to the size of the packaging bag. The rotary arm 13 is provided to reciprocate between the transfer position (x) and the relay position (y) by controlling the rotation of the rotary shaft 12 by a swing mechanism including a cam and a lever (not shown). Reference numeral 15 denotes a guide member for bringing the back surface or the front surface of the packaging bag lifted by the rotating arm 13 into contact with and stabilizing the packaging bag.

  Thus, the bag mouth portion of the packaging bag a stacked on the stocker 6 or fed one by one so as to come into contact with the stopper at the front end by the feeding belt of the known bag feeding means is adsorbed by the suction cup 8 of the bag lever 7. The turned packaging bag a is delivered to the rotary arm 13 at the delivery position (x), and then the rotary arm 13 is rotated to a substantially horizontal position so that the packaging bag a with the bag mouth b up is sandwiched between the bag gripping portions 20 described later. The bag supply unit 5 is configured to lift up to the relay position (y) where the dressing piece 30 stands by.

(Bag gripping part)
As shown in FIG. 6, for the bag gripping portion 20, a bracket 23 is fixed to the upper end portion of the vertical axis 22 supported by the first stand 21 erected on the machine base 1, and the vertical axis 22 is fixed to the bracket 23. A boss 25a of a holder 25 is inserted into a transfer fulcrum shaft 24 provided in parallel to a position separated from the holder 25, and the holder 25 is rotatably provided on a horizontal plane. As shown in FIG. 4, the holder 25 is provided with two rotating shafts 27a, 28a meshed with a pair of gears 27b, 28b in parallel in the horizontal direction, and a packaging bag is provided at one end of the rotating shafts 27a, 28a. A pair of clamping pieces 30 are provided for clamping. The miter gears 32 and 32 are attached to the other end portion of the one rotating shaft 27a and the lower end portion of the vertical transmission shaft 31 that is rotatably provided in the holder 25, respectively.
Note that a series of configurations including the gears 27b and 28b, the miter gears 32 and 32, the rotation shafts 27a and 27b, and the transmission shaft 31 is a kind of transmission mechanism that is a constituent requirement of the present invention.

  In the second stand 36 erected on the machine base 1, a hollow main shaft 37, which is an element of the second driving means 52 described later, is rotatably provided, and the elements of the first driving means 35 are provided in the main shaft 37. The auxiliary shaft 38 is loosely fitted concentrically, and the auxiliary shaft 38 is rotatably provided. A drive lever 39 is fixed to the upper end portion of the auxiliary shaft 38, and the free end of the drive lever 39 and the free end of the driven lever 40 fixed to the upper end of the transmission shaft 31 are connected by a rod 41. Reference numeral 42 denotes another drive lever fixed to the lower end portion of the auxiliary shaft 38.

  As shown in FIG. 5, a drive mechanism 45 including a cam and a lever is provided inside the machine base 1. The drive mechanism 45 fixes a circular cam 47 to a rotation shaft 46 disposed in a horizontal direction interlocked with a main drive shaft (not shown) that is rotationally controlled by a control unit of the packaging machine P, and the circumference of the cam 47 One lever portion 48a of the substantially L-shaped lever 48 is provided in contact with the surface. The tip of the other lever portion 48 b and the drive lever 42 are connected by a rod 49.

  Then, the lever 47 is swung vertically by the cam 47 to rotate the auxiliary shaft 38 clockwise and counterclockwise, and the rotational motion is transmitted to the transmission shaft 31 so that the miter gears 32 and 32 and the gears 27b and 28b are moved. By rotating the rotary shafts 27a and 28a through the bag grip portion 20, the pair of sandwiching pieces 30 can be opened and closed.

(Bag transfer part)
As shown in FIG. 4, the bag transfer unit 51 is fixed to the upper end portion of the main shaft 37 of the front second drive means 52, and is provided integrally with the free end of the drive lever 53 and the holder 25. The arm 25b is connected by a rod 54. Reference numeral 55 denotes another drive lever fixed to the lower end portion of the main shaft 37.

The second drive means 52 includes a drive mechanism 56 similar to the drive mechanism 45 using the cam and lever of the first drive means 35 described above.
That is, the drive mechanism 56 fixes a circular cam 58 to a rotation shaft 57 arranged in a horizontal direction interlocking with the main drive shaft (not shown), and a linear lever 59 is provided on the peripheral surface of the cam 58. One lever portion 59a is provided so as to contact. The distal end portion of the other lever portion 59 b and the drive lever 55 are connected by a rod 60.

  Thus, the main shaft 37 is rotated clockwise and counterclockwise by the drive mechanism 56, and the rotational movement is transmitted to the drive lever 53 and the rod 54, so that the holder 25 of the bag gripping portion 20 has the transfer fulcrum shaft 24 as the center of rotation. A bag transfer unit 51 is configured to be movable between the relay position (y) and the bag transfer destination (z).

(Bag height adjustment device)
The bag height adjusting device 65 includes a rotary encoder 66 having an input shaft connected to the rotary shaft 12 to which the rotary arm 13 is attached, and the passage through the bag mouth end of the packaging bag lifted by the rotary arm 13 before the relay position (y). A sensor 67 comprising a projector 67a and a light receiver 67b shown in FIG. 2 that detects at a predetermined position, and when the height of the packaging bag lifted by the rotary arm 13 is a normal position, The number of pulses generated by the rotary encoder 66 at the time of passage detection is used as a reference pulse, and the actual measurement pulse generated from the rotary encoder 66 and the reference pulse are compared and calculated every time the passage of the bag mouth is detected by the sensor 67. A control unit (not shown) for determining a correction value for correcting the position, and the vertical axis 22 is controlled to move up and down based on the determined correction value. And a drive unit 70.. Further details are described below.
Note that the control unit is composed of known electronic components and electronic circuits, and therefore will not be described.

  For the rotary encoder 66, if, for example, 8000 pulses are generated while the rotary arm 13 rotates from the delivery position (x) to the relay position (y), the reference pulse is set to 5000 pulses. In addition, when the difference between the reference pulse and the actually measured pulse at the time of detecting passage of the bag mouth by the sensor 67 is one pulse, the height of the packaging bag lifted by the rotary arm 13 is temporarily shifted by 0.1 mm from the normal position. It is assumed that the control unit sets the correction value in advance.

  The drive unit 70 is provided so as to connect the output shaft 71 a of the servo motor 71 to the lower end portion of the vertical axis 22.

  Therefore, if the measured pulse generated from the rotary encoder 66 when the sensor 67 detects the passage of the end of the packaging bag a lifted by the rotary arm 13 is, for example, 4950 pulses, the reference pulses 5000 to 4950 are subtracted. The pulse number 50 is converted into a correction value, and it is determined from the correction value that the packaging bag is 5 mm higher. Then, while the holder 25 of the bag holding unit 20 moves from the relay position (y) to the bag transfer destination (z), the drive unit 70 operates based on the output signal corresponding to the correction value determined by the control unit. By doing so, the bag height adjusting device 65 configured to lower the vertical axis 22 by 5 mm and adjust the height position of the packaging bag a to a predetermined position is configured.

  In FIG. 6, the portion surrounded by the oblique lines adopts a configuration in which the transfer fulcrum shaft 24 that is the rotation center of the holder 25 is provided at a position away from the vertical axis 22 supported by the first stand 21. It is a space that can be secured. Thereby, the freedom degree of arrangement | positioning of the printing machine 75 installed in the printing process (2) of the following process becomes large.

Next, the operation of the packaging bag supply device S of the packaging machine of the present invention configured as described above will be described.
(1) In the bag supply section 5, the packaging bag a fed into the stocker 6 so as to contact the stopper at the front end is rotated at the delivery position (x) by adsorbing the bag mouth portion by the suction cup 8 of the bag lifting lever 7. It is delivered to the arm 13.
(2) Then, the rotating arm 13 is rotated to a substantially horizontal position by the operation of a swing mechanism by a cam and a lever, so that the sandwiching piece 30 of the bag gripping portion 20 waits for the packaging bag a with the bag mouth b up. The relay is lifted up to the relay position (y) (FIG. 2).
(3) During that time, the packaging bag a lifted by the rotary arm 13 is detected by the sensor 67 to pass through the end of the bag, and the actual measurement pulse of the rotary encoder 66 is measured.
(4) At the relay position (y), the packaging bag a is supported in a suspended manner by the pair of sandwiching pieces 30 of the bag gripping portion 20.
(5) In the bag transfer unit 51, the main shaft 37 is rotated clockwise and counterclockwise by the drive mechanism 56 including a cam and a lever, and the rotational movement is transmitted to the drive lever 53 and the rod 54, whereby the bag holding unit 20 The holder 25 rotates about the transfer fulcrum shaft 24 from the relay position (y) to the bag transfer destination (z) and changes the orientation of the holder 21 during the rotation and is supported on the sandwiching piece 30. “a” is set to face the grip pair g (FIG. 3).
(6) At the same time, while the bag gripping part 20 moves from the relay position (y) to the bag transfer destination (z), the difference between the measured pulse and the reference pulse measured in (3) in the bag height adjusting device 65 Are compared and calculated to determine a correction value for correcting the height position of the packaging bag a. Next, the drive unit 70 is operated based on the output signal corresponding to the correction value determined by the control unit, whereby the vertical axis 22 is raised or lowered to adjust the height position of the packaging bag a to the normal position. .
(7) The packaging bag a is supplied to the grip pair g in a state in which the height position is adjusted by the bag height adjusting device 65 and the posture is in the directly-facing posture. Thereafter, a series of operations (1) to (7) are continuously performed.

P: packaging machine S: packaging bag supply device a of packaging machine of the present invention: packaging bag (x): delivery position (y): relay position (z): bag transfer Tip 5 ... bag supply section 7 ... bag lift lever 13 ... rotating arm 20 ... bag gripping section 22 ... vertical axis 23 ... bracket 24 ... transfer fulcrum shaft 25 ... holder 30 ... sandwiching piece 35 ... first driving means 37 ... main shaft 38 ... sub shaft 51 ... bag transfer part 52 ... second driving means 65 ... bag height adjusting device 66 ... Rotary encoder 67 ... Sensor 70 ... Drive unit 71 ... Servo motor

Claims (3)

At the delivery position (x), the packaging bag picked up by the bag mech lever is turned up and delivered to the rotating arm, and the packaging bag adsorbed by the suction cup provided on the rotating arm is relayed ( y) a bag supply unit that lifts up to a bag, a bag gripping unit that sandwiches and supports a packaging bag received from the bag supply unit, and a bag that intermittently stops the bag supply process by changing the direction of the bag gripping unit In a packaging bag supply device of a packaging machine, comprising a bag transport unit that supplies a packaging bag in a facing position to a grip pair of a transfer destination (z),
For the bag gripping part, a bracket is fixed to the upper end of the vertical axis supported by the first stand erected on the machine base, and a holder is provided on the transfer fulcrum shaft provided on the bracket so as to be rotatable on a horizontal plane. A pair of clamping pieces provided in the holder are provided to be opened and closed by a first drive means via a transmission mechanism,
For the bag transfer part, the holder of the bag gripping part is movably provided between the relay position (y) and the bag transfer destination (z) by the second driving means,
Further, a rotary encoder having an input shaft connected to a rotary shaft to which the rotary arm is attached, and passage of a bag mouth end of a packaging bag lifted by the rotary arm are detected at a predetermined position before the relay position (y). And the number of pulses generated by the rotary encoder at the time of passage detection by the sensor when the height of the packaging bag lifted by the rotating arm is a normal position, A control unit that determines a correction value for correcting the height position of the packaging bag by comparing and calculating the actual measurement pulse generated from the encoder and a reference pulse, and the vertical axis is controlled based on the determined correction value. A bag height adjustment device comprising a drive unit equipped with a servo motor to
While the bag gripping portion moves from the relay position (y) to the bag transfer destination (z), the packaging bag is supported by the sandwiching piece by raising or lowering the vertical axis by the bag height adjusting device. The packaging machine is configured to supply a packaging bag in a facing position to the grip pair by correcting the height position of the holder and changing the direction of the sandwich piece by the rotational movement of the holder. Packaging bag supply device.   The first drive means has a secondary shaft concentrically loosely fitted in a hollow main shaft rotatably provided in a second stand erected on the machine base, and a drive lever is mounted on the upper end of the secondary shaft. By fixing, connecting the free end of the drive lever and a part of the transmission mechanism built in the holder by a rod, and rotating the countershaft clockwise and counterclockwise by the drive mechanism by the cam and lever The packaging bag supply device for a packaging machine according to claim 1, wherein the transmission mechanism is operated so as to open and close the clamping piece.   The second drive means fixes a drive lever to the upper end of the main shaft, connects the free end of the drive lever and an arm provided on the holder by a rod, and drives the main shaft by a drive mechanism using a cam and a lever. The packaging bag supply device of the packaging machine according to claim 2, wherein the holder is rotatably provided by rotating clockwise and counterclockwise.

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