JPH0532230A - Interval adjustor of bag sandwiching clamp in bagging machine - Google Patents

Abstract

PURPOSE:To smartly adjust the interval between a pair of bag sandwiching clamps in a bagging machine even when the clamps are rotating. CONSTITUTION:A pair of clamp arms 26 which sandwich and support both side edged of a bag are provided on a peripheral edge of a disc 24, and a main shaft 23 connected to the center of the disc 24 is driven to rotate by force of a motor 44. On the other hand, second force divided from the main shaft 23 through a belt 46 is transmitted to gears 48 and 47 through a differential mechanism 45 to rotate a playing roll 32. The disc 24 and a playing motor 32 usually rotate at the same velocity and in the same direction. But if an operation adjusting shaft 60 is driven to produce a difference between input rotation and output rotation of the differential mechanism 45, the playing roll 32 displaces with respect to the disc 24. Then a wedge 33 supported by the playing roll pushes a lever 35, so that an interval between the pair of clamp arms 26 can be adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention rotates a large number of clamps, each set of two clamps, along a circular orbit so that both side edges of a packaging bag supplied from the outside are provided in the middle of the orbit. In a rotary bag filling machine in which a pair of clamps are sandwiched between the bags and the bags are hung by the clamps while the bags are sequentially filled with the objects to be packaged, as described above, The present invention relates to a device for adjusting a pair of clamp intervals according to a bag width when the width changes.

[0002]

2. Description of the Related Art Conventionally, as a device capable of adjusting a clamp interval even during rotation while rotating a large number of sets of bag-holding clamps, there have been hitherto disclosed in Japanese Utility Model Publication No. 57-37707 or Japanese Utility Model Publication No. 63.
No. 131,905 discloses the one generally shown in FIG. That is, the bag is provided by the clamps (3) provided at the tips of the arms (2), which are a set of two provided on the periphery of the disc (1).
Hold both edges of (4) and use the spindle (5)
By rotating (1), the bag (4) is transported along a circular path. In this case, the L-shaped bell crank (7) pivotally supported on the lower surface of the disc through the pin (6) slides on the upper surface of the cam (14) supported by the main shaft, and the pin unevenness of the cam causes the pin to move.
A pair of clamps is used to swing the arm (2) around the (8).
The interval of (3) changes and the bag mouth is widened or tensioned.
On the other hand, a pair of clamps according to the width of the bag supplied from the outside
To adjust the interval of (3), rotate the screw rod (9) and swing the lever (10) around the pin (11) by the screw action to move the cam (14) up and down. It can be done.

[0003]

However, in the above device,
The weight of the cam (8) acts on the lever (10) as a load, and the load of the tension spring (12) that constantly tries to close the gap between the pair of arms (2) acts synergistically on the cam weight. Therefore, it is light to lower the cam, but moving the cam up (13) is extremely heavy and difficult to operate.For example, when operating the screw rod (9) automatically with a motor, There was a drawback that it caused trouble. Therefore, the present invention is
It is an object of the present invention to provide a device capable of easily adjusting the clamp interval.

[0004]

In order to achieve the above object, the present invention according to claim 1 provides a plurality of sets of clamps, each pair having a clamp for holding a bag at a tip thereof. While supporting the arm on the periphery of the disc, a lever connected to the clamp arm is brought into contact with a fixed cam provided around the main shaft at the center of the disc, and each clamp arm is fixed by the rotational power of the main shaft. In a bagging machine in which a pair of clamp intervals are changed by the concave and convex portions of the fixed cam when it is revolved around the first axis, the first power transmission is performed between the input section of the differential mechanism including the differential adjustment operation axis and the main axis. And a floating roll rotatably installed around the main shaft and an output portion of the differential mechanism are connected via a second power transmission element, and the main shaft is connected via the differential mechanism. Idle And a lever connected to the clamp arm due to rotational displacement of the idler roll around the main shaft while the idler roll is connected to rotate at the same speed and in the same direction as the main shaft by a second power transmitted to the lever. The intermediary element for changing the extrusion amount with respect to is provided on the floating roll.

According to a fifth aspect of the present invention, an idle rotor is rotatably installed around a main shaft having a disc fixed to the upper end thereof, while the input portion of a differential mechanism having a differential adjusting operation shaft and the main shaft are provided. And is connected via the first power transmission element,
The output part of the differential mechanism and the idle roll are connected via a second power transmission element, and the idle roll is rotated by the second power transmitted from the main shaft to the idle roll via the differential mechanism. One side of each set of a large number of pairs of clamp arms that are connected to rotate at the same speed and in the same direction as the disk rotated by the Each clamp arm is supported by the disk, and each clamp arm on the other side is supported by the floating rotor.

[0006]

[Function] When the main shaft supported by the machine base is rotated by the prime mover,
The disc rotates integrally with the main shaft, the clamp arm supported by the disc revolves around the cam, and the unevenness of the cam is transmitted to the clamp arm via the lever. The distance between the clamps changes,
The mouth of the bag held between these clamps is unfolded at the place where the items to be packed are filled. On the other hand, the second power branched from the main shaft is transmitted to the idler roll via a differential mechanism, and causes the idler roll to rotate in the same direction at the same speed as the main shaft around the main shaft. Therefore, in the invention described in claim 1, the intermediary element supported by the idler roll revolves between the lever of the arm and the cam at the same speed as the lever, and therefore, the pushing amount of the lever is usually set. It does not change.
Therefore, when the differential adjustment operation shaft in the differential mechanism is rotated, the floating roll causes a differential in the traveling direction or the delay direction with respect to the main shaft to displace the intermediary element, so that the pushing amount relative to the arm lever changes. You can adjust the clamp interval.

On the other hand, in the invention described in claim 5, since the disk and the idler roll normally rotate at the same speed, the distance between the pair of clamp arms distributed and supported by the disk and the idler roll does not change. However, it is possible to adjust the distance between the pair of clamp arms by causing the floating roll to be differential with the differential adjustment operation shaft.

[0008]

EXAMPLE As shown in FIG. 1A, a disc (24) is attached to an upper end of a main shaft (23) which is vertically supported by a bearing (21) fixed to a machine base (20) via ball bearings (22). ) Is supported like an umbrella via the key (25), and as shown in FIG. 1B, a pair of clamp arms (26) (27) are provided on the peripheral edge of the disc, respectively, with pins (28). The clamp arms are swingably supported via (28), and the two clamp arms are connected by interlocking two fan-shaped gears (29, 30). Although only two sets of clamp arms are shown in the drawing for omission, a larger number of sets of clamp arms are installed on the disk (24) at equal intervals. Further, a circular floating roll (32) is rotatably supported around the bearing (21) through a ball bearing (31), and the upper surface of the floating roll has the same number of wedge-shaped clamp arms as the number of sets. Pin Mediating Element (33)
Pin roll (36) of lever (35) pivotally supported via (34) and connected to clamp arm (26), and tip of rocking plate (38) pivotally supported on disk via pin (37) The intermediary element (33) is interposed between the pin roll (39) and the pin roll (3
9) is in contact with the peripheral surface of the cam (40) fixed to the bearing (21). A tension spring (41) is provided between the two clamp arms (26) and (27), and the lever (35) is pin-rolled via the intermediate element (33) by the tension force of the spring (41).
(39) is pressed against the cam (40), and the interval between the clamps (42) (42) at the tip of the clamp lever is determined.

On the other hand, the lower end of the main shaft (23) is indexed
(43) is connected to the prime mover (44), and the differential mechanism (45) installed inside the machine base and the main shaft (23) are connected by the first power transmission element (46) and the differential mechanism ( The second power transmission element (48) connects 45) and the gear (47) on the lower surface of the idler roll (32).
More specifically, as shown in FIG. 2, the differential mechanism (45) includes a shaft (51) rotatably supported with respect to the housing (50), and a first sun gear (52) supported in a free-rotating manner. 2 Sun gear (53) key (54)
The planetary shaft (56) is rotatably supported by a support gear (55) that is supported by the shaft (51) in an idling manner, and the planetary gears (57) are provided at both ends of the planetary shaft (57). ) (58) is connected to both sun gears (52) (53), while the differential adjustment operating shaft (60) is connected to the supporting gear (55) via the beveled pinion (59). . Further, a pulley (61) fixed to the main shaft (23) and an input pulley (62) fixed to the first sun gear (52) are formed by a timing belt (63) via a first power transmission element (46). Gears (64) fixed to the output shaft (51) are engaged with the idle roll (32) as the second power transmission element (48).

Then, by transmitting the rotational power of the prime mover (44) to the main shaft (23) through the indexing index (43),
The disc (24) rotates intermittently at the same pitch as the mounting interval of each clamp arm. On the other hand, in FIG. 2, the rotation power of the main shaft (23) is the second rotation power via the belt (63) as the first sun gear.
The two planet gears (57) and (58) are rotated by the rotation of the first sun gear (52) transmitted to the (52) and rotate the shaft (51) via the second sun gear (53). . In this case, the idler roll (32) and the main shaft (23) can be rotated at the same speed by selecting the diameter of the preliminary pulley (61) or the number of teeth of the output gear (64). In this way, the main shaft (23) and the idler roll (32) rotate at the same speed, so that the wedge-shaped intermediate element (33) supported by the idler roll (32) does not displace and the disk is displaced.
(24) moves integrally, the unevenness of the peripheral surface of the fixed cam (40) is transmitted to the clamp arm (26) via the swing plate (38), the intermediate element (33) and the lever (35), respectively. The distance between the pair of clamps (26) and (27) changes due to the unevenness of the fixed cam during the circular orbit revolution.

On the other hand, the differential adjustment operation shaft (60) in the differential mechanism
The handle (65) is fixed to the steering wheel (65), and when the handle (65) is rotated, the support gear (55) is rotated by the pinion (59), and the two planetary gears (57) and (58) move to both sun gears. (52) Revolve around (53). There is a slight difference in the number of teeth between the two planetary gears (57) and (58), and a difference occurs in the second sun gear (53) by this difference in the number of teeth when revolving, causing the rocking roll (32) to move. Due to the displacement, the position of the wedge-shaped mediating element (33) is changed, and the pushing amount of the clamp arm with respect to the lever (35) is changed, so that the distance between the pair of clamp arms (26, 27) is changed. When changing the clamp interval arbitrarily according to the width of the bag supplied from the outside,
This adjustment is performed.

As an embodiment in which the differential adjustment operation shaft (60) is rotated by power, a belt (6) is provided between the shaft and the small motor (66).
7) and the motor (66) is rotated by a command from the inverter (68), and the motor (66) is fed by the feedback signal (70) from the encoder (69) connected to the motor shaft.
The output rotation angle of is controlled. The motor (6
6) may be a servo motor, in which case the inverter 68 is replaced by a personal computer.

FIG. 4 shows another embodiment. That is, the operating lever (73) of the clamp arm (72) supported by the disc (71) is connected to the pantograph-shaped link member (75) also supported by the disc (71) via the pin (74). It is connected.
Tension spring installed between both clamp arms (72) (76)
With respect to the tensile force of (77), the roller (7
8) presses against the fixed cam (79) and opposes it. The other end of the link material
(80) is supported by a floating roll connected to a differential mechanism, and normally the end (80) rotates in the same speed and in the same direction as the disc (71). By displacing and pulling the end (80) in the direction of the arrow (81), the lever (73) by the mediating element
The amount of extrusion of is changed, and the distance between the clamp arms (72) and (76) is increased.

FIG. 5 is shown in Japanese Utility Model Laid-Open No. 51-159684, in which the female screw at the end of the operating lever (84) of the clamp arm (83) supported by the disc (82) is replaced by the large ring gear (85 )
Is engaged with a threaded rod (87) which is connected to the shaft via a pinion (86). Normally, the disc (82) and the large wheel gear (85) rotate integrally, but when the large wheel gear (85) is displaced by the idle roll connected to the differential mechanism, the pinion (86) and the screw rod (87) Rotating together, the amount of pushing of the so-called intermediary element to the lever (84) is changed to adjust the clamp arm spacing.

FIG. 6 shows a floating roll in which one side of the pair of clamp arms is supported by a disc (92) and the other side of the clamp arm (91) is connected to a differential mechanism. An example supported by (93) is shown. Normally, the idle roll (93) rotates at the same speed with respect to the disc (92), but when the idle roll (93) is displaced with respect to the disc (92) by the operation of the differential mechanism,
The distance between the pair of clamp arms (90) (91) can be adjusted arbitrarily.

FIG. 3 shows a differential mechanism called a differential that is generally used for a drive shaft of an automobile. That is, four helical gears (97) supported by the frame (96) in the housing (95).
The second which is branched from the spindle (23) by combining (98) (99) (100)
Rotational power of the input shaft (10) via the first power transmission element (46).
1), the second power is output to the output shaft (102) as rotation in the opposite direction, the output is transmitted to the idle roll via the intermediary gear, and the idle roll is rotated at the same speed and in the same direction as the disc. I will let you. When the differential adjustment operating shaft (105) connected to the gear (103) formed on the frame (96) through the pinion (104) is rotated, the difference between the input shaft (101) and the output shaft (102) is Movement occurs.

[0017]

[Effect] The second power diverging from the main shaft of the disc is transmitted to the idle roll provided concentrically with the disc through the differential mechanism, and the disc and the idle roll are normally rotated in synchronization, and if necessary. Rotation of the disc by rotating the differential adjustment operation shaft, causing a differential between the rotation of the input part and the rotation of the output part of the differential mechanism, and displacing the idle roll in the rotational direction. Above all, the distance between the pair of clamp arms can be adjusted, and compared with the conventional one that moves the cam up and down to adjust the distance between the clamp arms, the effect that the clamp distance can be adjusted more easily according to the bag width There is.

[Brief description of drawings]

FIG. 1A is a front sectional view showing an embodiment of the present invention.

FIG. 1B is a plan view of the previous figure.

FIG. 2 is a sectional view of a differential mechanism.

FIG. 3 is a diagram of another embodiment of the differential mechanism.

FIG. 4 is a diagram showing another example of the intermediary element.

FIG. 5 is a diagram showing another example of the mediating element.

FIG. 6 is a diagram of another embodiment of the intermediary element.

FIG. 7 is an explanatory diagram of a conventional example.

[Explanation of symbols]

(23) ... Spindle (24) ... Discs (26) (27) ... Clamb arm (32) ... Floating roll (33) ... Mediation element (35) ... Lever (44) ... Motor (45) ... Differential mechanism (46) ) ... First power transmission element (48) ... Second power transmission element (60) ... Differential adjustment operation shaft
(66) ... Motor (68) ... Inverter (69) ... Encoder (71) ...
Disc (72)… Clamp arm (73)… Lever (75)…
Link material (82)… Disc (83)… Clamp arm (84)… Lever (85)… Large gear (86)… Pinion (87)… Screw rod (90) (91)… Clamp arm (92)… Circle Board (93)
… Floating rotor

Claims (6)

[Claims] 1. A fixed cam which supports a large number of sets of clamp arms, one set of which includes a pair of clamps for holding a bag at respective tips, on a peripheral edge of a disc and which is provided around a main shaft at the center of the disc. When the levers connected to the clamp arms are brought into contact with each other and each clamp arm is revolved around the fixed cam by the rotational power of the main shaft, the pair of clamp spaces are changed by the unevenness of the fixed cams. In the packing machine, an input portion of a differential mechanism having a differential adjustment operation shaft and the main shaft are connected to each other via a first power transmission element, and a floating roll rotatably installed around the main shaft and the differential. The output part of the mechanism is connected through a second power transmission element, and the second power transmitted from the main shaft to the idler roll through the differential mechanism causes the idler roll to move at the same speed and in the same direction as the main shaft. On the other hand, the rotational displacement of the idle roll around the main shaft causes
An interval adjusting device for a bag-holding clamp, which is provided on the floating roll, with an intermediary element for changing the pushing amount with respect to the lever connected to the clamp arm. 2. The interval adjusting device for the bag-holding clamp according to claim 1, wherein the intermediary element is formed by a wedge material which is cut into a tapered shape. 3. The distance adjusting device for the bag-holding clamp according to claim 1, wherein the intermediary element is formed by a link member assembled in a pantograph. 4. A displacement element in the rotation direction of the idler roll with respect to the main shaft rotates a screw rod engaged with the idler roll, and a transfer element is provided so as to change the pushing amount of the lever of the clamp arm engaged with the screw rod. The interval adjusting device for the clamp for holding the bag according to claim 1, which is formed. 5. An idler roll is rotatably installed around a main shaft having a disk fixed to the upper end thereof, while the input portion of a differential mechanism having a differential adjustment operation shaft and the main shaft are connected to a first power transmission element. By connecting the output portion of the differential mechanism and the idle roll via a second power transmission element, and by the second power transmitted from the main shaft to the idle roll via the differential mechanism, The floating roll is connected so as to rotate in the same direction at the same speed as the disk rotated by the main shaft, and among the multiple sets of clamp arms, one pair each having a clamp for holding the bag at the tip, An interval adjusting device for a bag-holding clamp, wherein each clamp arm on one side of each set is supported by the disk and each clamp arm on the other side is supported by a floating rotor. 6. The distance adjusting device for a bag-holding clamp according to claim 1, wherein a motor for controlling a rotation angle is connected to the differential adjusting shaft.