JP2001146211A - Opening degree adjusting device for a pair of grips for packaging machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an opening degree adjusting device for a pair of grips so modified as to easily adjust the opening degree for a pair of grips clamping package bags by driving a motor device. SOLUTION: When a feed screw 48 is rotated and driven by the motor device and a lifting and lowering shaft 40 is moved upward, an adjusting lever 31 is rocked to rotate an adjust ring 9 by a small angle in the closing side direction, and a second lever piece is moved inwardly by a third link with one end connected with the adjust ring to inwardly rotate a second lever to outwardly rotate first lever pieces 17 and 20 respectively and widen an interval L of clamping sections for clamping the side edge of a package bag on a pair of grips 15. When the feed screw is rotated and driven in the direction opposite to the above to move the rise and fall shaft downward, the adjusting ring is rotated by a small angle in the counterclockwise direction to rotate the second lever piece outward, and the first lever pieces are inwardly rotated respectively to narrow the interval of the clamping sections of a pair of grips.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for adjusting the opening of a pair of grips for holding a packaging bag in a rotary packaging machine by driving a motor device in accordance with the width of the bag.

[0002]

2. Description of the Related Art As a conventional device for adjusting the degree of opening of a grip pair for holding a packaging bag, as disclosed in Japanese Utility Model Publication No. Sho 63-30652, a handle provided on a swivel disk is rotated to rotate the swivel circle. By rotating the adjustment disk rotatably supported by the plate by a small angle, the link mechanism provided between the adjustment disk and the grip pair and the sector gear cooperate to increase the opening of the grip pair. It is structured to adjust according to the size of the bag width of the packaging bag.

[0003]

In the above-mentioned conventional opening adjustment device for a pair of grips, the adjustment is performed by visually confirming the distance between the holding portions of the pair of grips by rotating the handle. However, the handle does not always move with the turning disk and always stop at the same position,
For example, when the position of the grip pair and the handle stopped at the bag supply station before the packaging bag is opened is separated, it takes time to adjust the opening degree. In particular, in the case of a packaging machine in which the size of the bag width is frequently changed, the operation for adjusting the opening of the grip pair is complicated and it is not easy to perform the operation quickly.

It is an object of the present invention to provide an improved grip pair opening adjusting device which can easily adjust the opening degree of a grip pair holding a packaging bag by driving a motor device.

[0005]

In order to achieve the above object, according to the present invention, a plurality of grip pairs are equiangularly attached to a rotating body fixed to an intermittent rotating shaft freely rotatably provided on a stand. A first grip base that is radially arranged at intervals and is rotatably supported by a pair of longitudinal axes provided on the rotating body.
The free ends of the lever pieces are connected by a link, and a roller rotatably provided at the tip of an arm loosely fitted on one longitudinal axis is pressed against the outer periphery of a substantially circular cam plate fixed to the stand. The arm is connected to the free end of the first link connected to the second lever piece of the grip base by the second link, and is rotatably provided on the intermittent rotation shaft side concentrically with the rotating body. A free end of a third link, one end of which is connected to a pin of an adjusting ring, is provided so as to be connected to a connecting shaft between the first link and the second link, and swings on a bracket fixed to an upper surface of the rotating body. The other end of the rod, one end of which is connected to the downward piece of the freely provided adjusting lever, is connected to the adjusting ring, and the roller provided at the tip of the horizontal piece of the adjusting lever is rotatably provided in the intermittent rotating shaft. Move up and down A nut body fixed to the lower part of the elevating shaft is provided so as to be screwed to a feed screw driven to rotate by the motor device. By moving the elevating shaft by driving and rotating the adjustment ring, the distance between the holding portions for holding the side edges of the packaging bag of the grip pair is adjusted according to the size of the bag width. Features.

[0006]

When the feed screw is rotationally driven by the motor device to move the elevating shaft upward, the adjusting lever swings to rotate the adjusting ring clockwise by a small angle, so that the adjusting ring has one end. The second lever piece is moved inward by the third link to which is connected. As a result, the first lever pieces rotate outward with respect to each other, and the interval between the holding portions that hold the side edges of the packaging bag of the grip pair is widened.

When the feed screw is driven to rotate in the opposite direction to move the elevating shaft downward, the adjustment ring rotates counterclockwise by a small angle to move the second lever piece outward. Thereby, the first lever pieces rotate inward each other, and the distance between the holding portions of the grip pair is reduced.

In order to automatically adjust the opening of the grip pair according to the size of the bag, the amount of rotation of the output shaft of the motor device corresponding to the size of the bag is set in advance to control the packaging machine. When the dimensional value of the bag width is input from the operation unit, the amount of rotation of the motor device is feedback-controlled based on the control value of the storage unit, and the amount of movement of the elevating shaft is adjusted. The configuration can be easily performed.

According to the opening adjusting device for the grip pair in this packaging machine, the opening of the grip pair that holds the packaging bag can be easily and quickly adjusted by driving the motor device. In addition, the opening can be adjusted even during the operation of the packaging machine, which is extremely safe.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a vertical sectional side view showing the left half from the rotation center of the intermittent rotation shaft, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a plan view showing a relationship between a pair of grips and an adjustment ring, and FIG. FIG. 5 is a side view showing a mechanism for moving an elevating shaft by a servomotor device, and FIG. 6 is a sectional view taken along line AA of FIG.

In FIG. 1, a vertically standing intermittent rotating shaft 2 is rotatably supported via a bearing 3 on a stand 1 erected on a machine stand (not shown) of a rotary type packaging machine. . The lower part of the intermittent rotating shaft 2 is fixedly supported by an output shaft 6 of an indexing device 5 partially shown in FIG. Reference numeral 10 denotes an annular rotating body 10 fixed to the base plate 7 attached to the upper flange 2a of the intermittent rotating shaft 2. An adjusting ring 9 is arranged concentrically between the lower surface of the rotating body 10 and the step 8 formed on the outer peripheral edge of the base plate 7, and the inner edge 9 a of the adjusting ring 9 is engaged with the step 8. Then, the adjusting ring 9 is provided rotatably with respect to the intermittent rotation shaft 2 side. 14 is an upper flange 1a of the stand 1.
A substantially circular cam plate is fixed to the cam plate.

A pair of grips 15 for holding a large number of packaging bags (in short, the same number as the number of stations) are arranged at equal angular intervals on the rotating body 10 in the radial direction. For more information,
As shown in FIGS. 1 and 2, an outer peripheral edge 10 a of the rotating body 10 is provided.
The grip bases 16 and 19 of the grip pair 15 are rotatably supported by the pair of longitudinal axes 12 and 12 provided at equal angular intervals. The first lever piece 17 of one grip base 16 and the first lever piece 20 of the other grip base 19
Are connected by a link 18. A roller 23 is rotatably supported on the tip end portion 22a of the arm 22 loosely fitted to the lower portion of the one longitudinal axis 12 on the grip base 19 side, and the roller 23 is rotated by a spring (not shown). It is provided so as to be pressed against the outer periphery.

The second lever piece 2 of the grip base 19
1 is connected to one end of a first link 24, and the free end of the first link 24 is connected to the arm 22 by a second link 25. Further, a free end of a third link 28 having one end connected to a pin 27 fixed to the adjustment ring 9 is connected to a connection shaft 26 between the first link 24 and the second link 25. Further, a grip pair body 15a having a movable pressing piece 15b of a known structure slidably attached thereto is attached to the outer portions of the grip bases 16 and 19, respectively. The tip of the grip pair body 15a and the tip of the movable pressing piece 15b constitute a holding portion 15c for holding the side edge of the packaging bag a.

As shown in FIG. 2 and FIG.
The bracket 30 fixed to the upper surface of the
The adjustment lever 31 integrally formed with the horizontal piece 33 is supported by the horizontal shaft 34, and the adjustment lever 31 is provided to be swingable. The other end of the rod 35 having one end connected to the downward piece 32 is connected to a pin 36 fixed to the adjusting ring 9 and protruding upward from the long hole 13 of the rotating body 10. A roller 37 is rotatably provided at the tip of the horizontal piece 33.

Numeral 40 designates an elevating shaft which is loosely fitted in the intermittent rotating shaft 10 so as to be freely movable in the vertical direction. As shown in FIG. 1, the elevating shaft projects above the upper end of the intermittent rotating shaft 2. It is provided so that the roller 37 of the adjustment lever 31 is supported by the flange 41 of 40. As shown in FIGS. 5 and 6, a mounting hole 45 of the nut body 42 is
Is inserted and the nut 46 is tightened to fix the nut body 42. A female screw 44 is formed vertically on the boss 43 at the tip of the nut body 42. Reference numeral 48 denotes a shaft portion 48a to which a driven sprocket 50 is fixed below the screw portion 49, which is loosely fitted to a support plate 52 via a collar 51, and a shaft portion 48b extending upward from the screw portion 49 to a lower surface of the index device 5. The feed screw is loosely fitted to the support plate 53 fixed to and is rotatably provided. The female screw 44 of the nut body 42 is screwed into the screw portion 49 of the feed screw 48. 55 and 56 are a rising end detection piece and a falling end detection piece attached to the upper and lower positions of the protruding piece 42a provided on the nut body 42, 57 is a proximity switch attached to the support plate 53, and 58 is a support switch Proximity switch attached.

A servo motor device 62 is mounted on a bracket 61 fixed on a lower frame 60 of the machine base with an output shaft 62a facing downward, and a drive sprocket 63 is mounted on the output shaft 62a. Reference numeral 64 denotes a disk fixed to the boss 63a of the driving sprocket 63, and the disk 6
A number of through holes 65 are formed in an outer peripheral edge of the ring 4 in an annular shape. Reference numeral 66 denotes a photoelectric sensor provided on the bracket 61 such that a light emitting unit and a light receiving unit correspond to the through holes 65 of the disk 64. Reference numeral 67 denotes a chain spanned between the driving sprocket 63 and the driven sprocket 50.

Next, the operation of the opening adjustment device for the grip pair having the above-described configuration will be described. Servo motor device 6
When the feed screw 48 is driven to rotate by 2, the nut body 42 screwed to the feed screw 48 moves upward together with the lifting shaft 40. 4 by the raising operation of the lifting shaft 40.
2, the horizontal piece 33 of the adjusting lever 31 swings to move the rod 35 to the left, and the adjusting ring 9 is rotated clockwise by a small angle as shown in FIG. 2. The third link 28 and the first link 24 are used to rotate the adjustment ring 9.
Follows and moves the second lever piece 21 inward. As a result, the first lever piece 20 and the first lever piece 17 rotate outward with respect to each other.
Is increased.

When the feed screw 48 is driven to rotate in the opposite direction by the servo motor device 62, the elevating shaft 4
Zero moves downward and the adjustment ring rotates counterclockwise by a small angle. As a result, the second lever piece 21 moves outward and the first lever piece 20 and the first lever piece 17 rotate inward each other, so that the distance L between the holding portions 15c of the grip pair 15 is reduced.

The opening L of the grip pair 15 is determined by the amount of movement of the elevating shaft 40. Therefore, the amount of rotation of the output shaft 62a of the servo motor device 62 corresponding to the size of the bag width is set in advance and stored and processed in the control unit of the packaging machine. The servo motor device 6 is controlled by a command from the control unit.
2 and the rotation angle thereof is set to the disk 64 and the photoelectric sensor 66.
And the pulse signal is detected by the servo motor device 6.
2, the opening of the grip pair 15 can be almost automatically adjusted.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing a left half from a rotation center of an intermittent rotation shaft.

FIG. 2 is a plan view of FIG. 1;

FIG. 3 is a plan view showing a relationship between a pair of grips and an adjustment ring.

FIG. 4 is a partially broken side view showing a relationship between an adjustment lever and an adjustment ring.

FIG. 5 is a side view showing a mechanism for moving an elevating shaft by a servo motor device.

FIG. 6 is a sectional view taken along line AA of FIG. 5;

[Explanation of symbols]

a → Packaging bag L → Interval (opening of grip pair) 1 → Stand 2 → Intermittent rotating shaft 9 → Adjustment ring 10
→ Rotating body 12 → Vertical axis 14 → Cam plate 15 → Grip pair 15a → Grip pair body 15b →
Movable pressing piece 15c → Nipping parts 16, 19 → Grip base 17, 2
0 → first lever piece 18 → link 21 → second lever piece 22 → arm 2
3 → Roller 24 → First link 25 → Second link 26 → Connection shaft
27 → pin 28 → third link 30 → bracket 31 → adjustment lever 32 → downward piece 33 → lateral piece 35 → rod 36 → pin 37 → roller 40 → elevating shaft 41 → flange 42 → nut body 48
→ Feed screw 50 → Driven sprocket 62 → Servo motor device (motor device) 63 → Drive sprocket 64 → Disk 66 → Photoelectric sensor

Claims (1)

[Claims] 1. A plurality of grip pairs are radially arranged at equal angular intervals on a rotating body fixed to an intermittent rotating shaft freely rotatably provided on a stand, and rotated by a pair of longitudinal axes provided on the rotating body. The free ends of the first lever pieces of the freely supported grip base are connected by a link, and a roller rotatably provided at the tip of an arm loosely fitted on one longitudinal axis is fixed to the stand. A free end of a first link connected to a second lever piece of the grip base and the arm are connected by a second link, provided so as to be pressed against the outer periphery of a substantially circular cam plate, and concentric with the rotating body. The rotating body is provided such that a free end of a third link having one end connected to a pin of an adjustment ring rotatably provided on the intermittent rotation shaft side is connected to a connection shaft between the first link and the second link. Bracket fixed on top of The other end of a rod, one end of which is connected to a downward piece of an adjustment lever provided to swing freely, is connected to the adjustment ring, and a roller rotatably provided at the tip of a horizontal piece of the adjustment lever is provided with the intermittent roller. It is provided so as to be supported by a flange of an elevating shaft which is freely and vertically movable within a rotating shaft, and a nut body fixed to a lower portion of the elevating shaft is screwed into a feed screw which is rotationally driven by a motor device. By moving the elevating shaft by driving the motor device and rotating the adjusting ring, the distance between the holding portions for holding the side edges of the packaging bag of the grip pair is adjusted to the size of the bag width. An opening adjusting device for a grip pair in a packaging machine, wherein the adjusting device is configured to be adjusted.