JP2615108B2 - Rotary bag opening unit - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a device for successively binding bag ends of packaged products produced by a rotary bag-type packaging machine.
More specifically, the packaging bag is clamped on both sides of the packaging bag by clips at the tip of a large number of one-to-one sets of clamp arms provided on the peripheral edge of the disk, and the package is hung on the clamp arm by the rotation of the disk. The bags are transported in a circular orbit, and while each of the packaging bags is being transported in the circular orbit, each bag is filled with the articles to be packaged, and then the opening rim of the bags is sealed to a rotary bag-filling and packaging machine. This is a binding device that squeezes the bag opening of the adjacent packaging bag opened from the bagging and packaging machine, and binds the squeezed portion with a tape or a wire.

(Prior Art) Japanese Patent Application Laid-Open No. 62-182017 discloses that a plurality of sets of clamping arms, each of which is a set of two, are swingably supported via pins on the periphery of a disk which rotates intermittently by driving a center shaft. At the same time, each of the clamping arms is engaged with a grooved cam which is concentric with the disk and is provided in an immovable state. When the disk rotates integrally with the clamping arms, the cam groove is bent by bending the cam groove. The tip of the holding arm is approached, the opening of the packaging bag that has been hooked down from above is squeezed finely with these holding arms, and the bag is transported by passing the packing bag through the binding mechanism provided in the transport track. Are disclosed.

(Problems to be Solved by the Invention, etc.) However, the above-described device is configured to bind bagged products produced by a vertical pillow packaging machine. Attempts to receive and bind a packaging bag (bagged product) that is adjacent to and opened from the bagging and packaging machine does not work. Because, in the rotary bagging and packaging machine, bagged products are clipped on both sides of the bag mouth and are hung down,
This is because even if the holding arms are approached from both sides of the bag mouth, the bag is full of commodities and the bag mouth cannot be narrowed down. However, if the clip holding the bag at the same time is opened while the holding arm is approached, the bag-packed product slips downward momentarily due to the weight of the product in the bag, and the binding position with the tape becomes uneven.

Conventionally, Japanese Utility Model Application Laid-Open No. Sho 53-136963 and JP-A-59-26
No. 422 also discloses this type of binding device,
All of these are to bind the bag mouth with tape while carrying the bagged goods on the conveyor and transport them.For example, if the bag made of unstable flat bag is put on the conveyor, the weight of the product The height of the bagged product is not constant, and the binding position by the tape becomes uneven.

SUMMARY OF THE INVENTION In view of the above, the present invention provides an apparatus that can tie the same position of individual bagged items regardless of the weight of the bagged item released from the rotary bagging and packaging machine. (The present application is an improvement of Japanese Patent Application No. 62-207143.) (Means for Solving the Problems) In order to achieve the above object, the present invention provides a main shaft vertically rotatably supported on a machine base. A plurality of fluid cylinders are radially protruded from the upper disk at regular intervals, and holding claws are provided at each of the fluid cylinders and the tip of each piston rod. The main shaft is connected to a power source so as to intermittently rotate at a pitch, and a pair of holding arms are rotatably supported on the discs on both sides of each of the fluid cylinders, and are disposed around the main shaft. As described above, the operating pins of the respective holding arms are engaged with the groove cams fixed on the machine base, and the groove cams of the pair of holding arms are brought close to each other while the disk makes one rotation. Form a groove On the other hand, a rotary valve is formed by a movable member engaged with the main shaft and a fixed member supported by an immovable portion, and a fluid pressure source and each of the fluid cylinders are circuit-connected via the rotary valve, and A fluid pressure is applied to each of the fluid cylinders so that each of the clamping claws is closed at one stop point of the fluid cylinder, and a binding mechanism is installed in an area where each of the pair of clamping arms moves close to each other. It is configured as follows.

(Operation) A plurality of fluid cylinders are protruded at equal intervals from the disk at the upper end of the spindle, and the disks are intermittently rotated at the same pitch as the installation intervals of the respective fluid cylinders by driving the spindle. Each of these fluid cylinders always moves so as to stop at the same position.

On the other hand, a rotary valve is formed by a movable member engaged with the main shaft and a fixed member supported by an immovable portion, and the rotary valve slides on the surface of the fixed portion and rotates by moving the main shaft. . And
The fluid pressure source and the fluid cylinder are connected to each other through a circuit through the rotary valve so that each of the holding claws is closed at one stop point of each of the fluid cylinders. When installed so as to coincide with the release position of the packaged product in the type bag packaging machine, each fluid cylinder stops and catches the bag mouth of the packaged product released from the bag packaging machine at the same time as stopping.
The packaged product is transported while being caught.

A pair of holding arms are provided on the disk on both sides of each of the fluid cylinders, and the operating pins of the holding arms are engaged with the groove cams so that the tips of the paired arms come closer by the groove cams. Therefore, each packaged product supported and conveyed by the clamping claws as described above is narrowed in the bag mouth by the pair of clamping arms, and is provided in an area where each pair of clamping arms moves closely. The binding mechanism binds the narrowed portion of the bag mouth.

(Embodiment) In FIG. 1, a bag packing machine (10) is provided with a large number of clamp arms (12) (12)... The clip (13) (13) at the tip of the clamp arm is configured to hold the packaging bag (100). The rotor (11) is a shaft (14)
, The packaging bag (100) is supported by the vacuum cup (15) and supplied to the clips (13) and (13) in the section A, and the clips clamp the packaging bag. After turning in the direction of the arrow and opening the mouth of the packaging bag at each section in the middle of the rotation orbit and filling the packaged object and the flavoring liquid, a pair of seal bars (16) (1
Such a configuration is generally known, in which the bag mouth is thermally welded in 6) and the package product (100 ') is released from the pair of clamp arms (12) (12) in the Z section.

On the other hand, the binding device radially protrudes three fluid cylinders (21), (21) and (21) from the upper part of the disk (20), and a pair of holding arms (22) on both sides of each fluid cylinder.
(23) ... is configured. More specifically, as shown in FIG. 2, a cylindrical main shaft (26) is rotatably supported on a bearing (25) erected on the upper surface of the machine base (24), and is mounted on the upper end of the main shaft (26). Each of the fluid cylinders (21) is supported on the upper surface of a fixed disk (20). Each of the fluid cylinders has a movable claw (35) pivotally supported at its tip via a pin (30). The piston rod (32) is connected to one end of the operating lever (31), and the movable claw (35) and the fixed claw (36) provided at one end of the fluid cylinder are tensioned by a coil spring (33) provided in the fluid cylinder. ), So as to always open.

A prime mover (42) connected to the prime mover via a bevel gear (41) inside the machine base and a driven shaft (43) provided in parallel with the prime mover are engaged via a general bus stop (44), A chain wheel (45) provided on the driven shaft and a chain wheel (46) provided on the lower end of the main shaft are connected via a chain (47), and the main shaft (26) is operated by the action of the general bus stop (44). It is designed to rotate intermittently by 120 degrees. Therefore, in FIG. 1, the three fluid cylinders (21), (21), (21) are intermittently rotated by the disk (20) in the direction of the arrow at the same pitch as the mounting interval of each fluid cylinder.

On the other hand, the mandrel (37) whose lower end is fixed to the machine base is
And a circular fixed member (39) is fixedly supported on a seat plate (40) at the upper end of the core rod, and a movable member (38) is set on the fixed member. Fixing member (3
9) and the movable member (38) form a rotary valve (50). A lower end of a passage (27) formed along the inside of the core rod (37) is connected to a pressurizing source via a hose (28), and an upper end of the passage (27) is connected to the fixing member (3).
9), three holes (29), (29), (29) are opened above and below the movable member (38), and these holes (29), (29), (29) and 3 fluid cylinders (2
1) (21) (21) and tube (34) (34) (3
4) are linked through. Further, an L-shaped engaging member (48) is protruded from the peripheral surface of the movable member (38) of the rotary valve, and an attachment (49) provided on the upper surface of the disk (20) is attached to the engaging member (48). Hooked on a disk (20)
And the movable member (38) are integrally linked, and the holding claws at the tip of the fluid cylinder are connected to the spring (33) only while the pressurized fluid is acting on the fluid cylinder (21) via the tube (34). To close against the tension of Therefore, it is set so that the holding claws are closed at the same time when the disk (20) stops, and as shown in FIG. 3 fluid cylinders (21)
The packaged products packed in step 0) are successively received and transported.

As shown in FIG. 1, on both sides of the fluid cylinder (21), a pair of clamping arms (22) (23) are provided below the disk (20).
Are supported by pins (58) and (58), and a groove cam (59) fixed around the upper end of the bearing (25), that is, two endless grooves (55) as shown in FIG. ) (56)
Are formed in the groove cams, and the operating pins (53) and (54) of the pair of holding arms (22) and (23) are engaged with the grooves (55) and (56). Then, the disk (20) is rotated by the main shaft (26), and the operating pin (5) of the clamping arm supported by the disk is rotated.
3) When (54) travels along the grooves (55) and (56), the open ends of the pair of clamping arms (22) and (23) approach each other while the main shaft (26) makes one rotation, and the dent ( 57) During (57), the mouth of the packaged product (100 ') is squeezed narrowly (see the state at the lower right of FIG. 1). A known tape binding mechanism (60) is provided in the running area at the tip of the clamping arm, and the bundled product (100 ') is finely squeezed on the binding mechanism (60) by the clamping arms (22) and (23). As shown in FIG. 6, the packaged product (100 ') is bound by a tape (61) as shown in FIG. 6, and the pair of holding arms (22) and (23) are opened to open the packaged product. Falls down.

The lower part of the rotary valve (50) in FIG. 2 is a fixed member and the upper part is a movable member, but as shown in FIG.
It is also possible to provide the movable member (38) directly on 6), and to provide the fixed member (39) on the movable member by supporting the fixed portion (52) via the stay (51). .

Further, the rotary valve (50) shown in FIGS. 1 and 4 has a function of switching and controlling the fluid itself. However, the idea that the rotary valve (50) is merely a rotary joint for a fluid circuit is also established. As shown in FIG. 5, such a configuration based on thinking is provided with three switching valves (70), (71), and (72) on a disk (20), and the switching valve is provided through each of the switching valves. The three holes (29) (29) (29) in the rotary joint (50) and the three fluid cylinders (21) (21) (21) are connected through tubes (34) (34) (34). At the same time, one end of each of the spools (75), (76), and (77) in each of the switching valves is connected to a rotary joint (50).
Contact the peripheral surface of the lower stationary cam (80). The spool (75) is pressed against the cam (80) by the force of a spring installed in the switching valve (70).
5) shuts off the fluid pressure at the swollen portion of the cam (80) and applies the fluid pressure to the fluid cylinder (21) at the lower portion of the cam. Therefore, by setting the spool (75) to drop from the end of the swollen portion of the cam (80) to a lower portion at the same time as the disk (20) stops, the packaging machine is held by the holding claws at the same time as the stop of the disk. You can catch packaging products. However, in FIG. 5, the control function of the rotary valve is replaced by three switching valves (70), (71), and (72), and there is no particular difference in the effect. Then, this embodiment belongs to the claims of the present application. The “cam” in the above
Is not limited to the purely mechanical one shown in FIG. For example, a phototube may be provided at a predetermined position, and when the switch reaches a certain position of the phototube, the electromagnetic switching valve may be activated.

(Effect) In the present invention, a plurality of fluid cylinders (21) are radially protruded from the disk (20) at the upper end of the main shaft (26), and clamp tips are provided at the ends of each of the fluid cylinders. Since the disc (20) is stopped by the control of (50) and the claws are closed at the same time, the location where the claws clamp the packaged product is determined by the rotary bag packing machine. When the apparatus of the present invention is installed in accordance with the location where the packaged product is to be opened, the packaged product can be transported in a circular orbit while supporting the packaged product in a hanging manner with each of the holding claws. The mouth of the packaged product can be finely squeezed and bound by a pair of clamping arms. Therefore, compared to the conventional one in which the packaged product is delivered directly from the bag packaging machine so that the packaged product is sandwiched directly by the pair of clamping arms, each bag is determined regardless of the weight of the product inside the bag. There is an effect that the parts can be united uniformly.

[Brief description of the drawings]

1 is a plan view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II in the previous figure, FIG. 3 is a view taken along the line III-III in the previous figure, FIG. 4 and FIG. Is an explanatory view of another embodiment, and FIG. 6 is an explanatory view of a packaged product. (10) …… Packing and packaging machine, (11) …… Rotor, (12)
…… Clamp arm, (20)… Disc, (21)… Fluid cylinder, (22) (23)… Clamping arm, (24)…
Machine base, (26) ... spindle, (27) ... passage, (31) ... operating lever, (33) ... coil spring, (34) ... tube, (35) ... movable claw, (36) ) …… Fixed nail, (38)
... Movable member, (39) fixed member, (42) driving shaft, (44) general bath top, (48) engaging member,
(49) Attachment (50) Rotary valve (53) Operation pin (59) Groove cam (60)
... Bundling mechanism,

Claims (1)

(57) [Claims] 1. A plurality of fluid cylinders project radially at equal intervals from a disk at the upper end of a main shaft vertically rotatably supported on a machine base, and holding claws are respectively provided on each of the fluid cylinders and the tip of each piston rod. On the other hand, the main shaft is connected to a power source so that the discs intermittently rotate at the same pitch as the installation intervals of the fluid cylinders, and a pair of clamps are held on both sides of the fluid cylinders with respect to the discs. The arm is rotatably supported, and the operating pins of the holding arms are engaged with groove cams fixed on the machine base so as to be disposed around the main shaft. The groove of the groove cam is formed so that the tips of the pair of holding arms are close to each other, while a rotary valve is formed by a movable member engaged with the main shaft and a fixed member supported by an immovable portion. The fluid pressure source and each of the fluid cylinders are connected in a circuit via the rotary valve, and the fluid pressure is applied to each of the fluid cylinders so that the holding claws are closed at one stop point of each of the fluid cylinders. On the other hand, a rotary-type bag-mouth tying device in which a tying mechanism is installed in an area where the above-mentioned pair of holding arms move close to each other.