JPH0635167B2 - Bag making machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention provides a bottom-sealed bag body by sealing and cutting a long raw material obtained by flatly folding a cylindrical synthetic resin film at predetermined intervals. The present invention relates to a bag making machine applied when manufacturing.

[Prior Art] With a conventional bag-making machine that manufactures bottom-sealed bags, the feeding speed when intermittently feeding a raw material and the ascending / descending speed of a seal bar that moves up and down in synchronization with the intermittent feeding operation of the raw material are controlled. It was adjusted by a mechanical speed change mechanism.

[Problems to be Solved by the Invention] In a conventional bag-making machine, a mechanical speed change mechanism is driven by using a constant-speed rotary electric motor. A complicated gear change mechanism is required for gear change control, and it takes a lot of time and labor to set it, and it is difficult to adjust the gear shift precisely, such as adjusting the sealing time. There is.

The present invention aims to solve the above problems.

[Means for Solving the Problems] A bag making machine according to the present invention includes a first feed mechanism having a first feed roll which is rotationally driven by a first control motor capable of gear shift control, and a lateral side of the first feed roll. A second feed mechanism having a second feed roll that is concentrically adjacent to and is rotationally driven by a second control motor capable of gear shift control;
The speed at which the seal bar is moved up and down between the seal position and a position slightly above it by being driven by a third control motor capable of gear shift control, and the seal bar is at an intermediate position of its lifting stroke. Within each ascending / descending stroke, the speed of ascending / descending to a position slightly above the sealing position and the speed of ascending / descending of the seal bar between the intermediate position and the top dead center position are different from each other. A seal bar drive mechanism that shifts and moves up and down at three stages of speed, and a blade drive mechanism that is driven by the third control motor to move up and down a movable blade for cutting in a lift mode similar to that of the seal bar. And a controller for individually controlling the shift mode of each of the control motors.

[Operation] First for rotating and driving the first feed roll of the first feeding mechanism
The control motor and the second control motor that rotationally drives the second feed roll of the second feeding mechanism are controlled to change gears to 1
While controlling the transfer of two or two rows of original fabric in a feeding mode adapted to each original fabric, a silver drive mechanism driven by a third control motor causes the sea bar to move to a seal position and a position slightly above it. Between the intermediate position and the top dead center position, the speed at which the seal bar ascends and descends between the intermediate position of the lifting stroke and a position slightly above the seal position, and the speed between the intermediate position and the top dead center position. The speed is increased / decreased to three different speeds within each ascending / descending speed, and the movable knife is moved up / down in the same manner as the seal bar, so that Sealing and cutting are performed at a sealing speed and a cutting speed suitable for the type and thickness, and the feed rate of the raw material and the ascending / descending speed of the seal bar and the movable blade are controlled in a related manner.

[Advantages of the Invention] Since the present invention is configured as described above, the feed mechanism, the seal bar, and the speed change mechanism for controlling the speed change of the movable blade can be simplified, and the feed speed of the material can be reduced. It is possible to change gears according to the specifications, and to change the speed of raising and lowering the seal bar and the movable blade according to the specifications of the original fabric, and to adjust the original fabric at a speed that is suitable for the type, thickness and feed length of the original fabric. It can be precisely transferred, and the raw material can be sealed and cut.

Therefore, it is possible to solve the problem that the raw fabric is illegally transferred and stably manufacture the bag body having a proper shape at a high speed.

In particular, since the sealing time for the original fabric can be selected according to the type and thickness of the original fabric, it is possible to seal various original fabrics in a proper sealing state to eliminate sealing defects and Since the speed at which the seal bar and the movable blade move up and down during transfer can be increased, the raw material can be efficiently sealed and cut, and the speed at which the seal bar and the movable blade move up and down within the lifting stroke. Can be smoothly switched from a high speed state to a low speed state through a medium speed state to eliminate a sudden speed change.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings.

In a bag making machine for manufacturing a bottom-sealed bag body by sealing and cutting a double sheet-shaped raw fabric G obtained by flatly folding a cylindrical long synthetic resin film, the upper end of a frame 32 2 rows of original fabrics G pass in parallel, or an original fabric passage 33 through which one row of original fabrics G passes is formed from the rear end to the front end of the frame 32, and each original fabric G has a pair of left and right. It is stored by the sending and storing mechanism 34, 34 and sent to the original fabric path 33. Raw fabric passage 33
The raw fabric G fed to the above slides in contact with the upper surface of the conveyor 9 rotatably installed in the center of the upper end of the frame 32, and further moves upward and downward in the front and upper direction of the conveyor 9 to be adjustable. The length-adjusting roller 35 which is horizontally mounted is hooked in an inverted V shape, advances to the front end of the original fabric passage 33, and is forwarded by a delivery mechanism (not shown).

A controller 30 including a microcomputer for controlling various operations of the bag making machine is installed near the frame 32, and three drivers 31A, 31B and 31C are connected to the controller 30.

Above the rear part of the frame 32, there are first and second mark sensors 19 for detecting marks, patterns, etc., which are respectively marked on the original fabric G at regular intervals corresponding to the bag length of the bag to be manufactured,
19 is installed close to the original fabric passage 33, and a detection signal is input to the controller 30 every time a mark or the like passes directly under both mark sensors 19.

In the front part of the frame 32, a first control motor 1 and a second control motor 2 of a servo motor type capable of gear shift control according to a command signal of the controller 30 are arranged side by side in a front-rear direction. Are encoders 38,
39 is attached. The first control motor 1 has a length of one feed of the original fabric G input in advance in the controller 30 and the original fabric G.
Based on the seal time for sealing the seal, the detection signal of the first mark sensor 19, and the output signal of the encoder 38, the shift control is performed in accordance with the shift command signal output by the controller 30 to intermittently rotate and drive the second control motor. 2 is the one-time feed length of the original fabric G previously input to the controller 30,
Based on the sealing time, the detection signal of the second mark sensor 19 and the output signal of the encoder 39, the controller 30
The gear shift control is performed according to the gear shift command signal output by the motor and the motor is intermittently driven to rotate.

A first feed roll drive shaft 13 and a second feed roll drive shaft 14 are laid horizontally above the control motors 1 and 2 in parallel along the width direction of the original fabric passage 33.

At the upper end of the front part of the frame 32, a pair of upper and lower first feed rolls 6 and 6 is rotatably provided above the second feed roll drive shaft 14 and has a length of about 1/2 of the passage width. A pair of upper and lower delivery rolls 25, 25 rotatably mounted in front of the first feed rolls 6 and a plurality of pairs of spring belts 26, 26 mounted on the first feed roll 6 and the delivery roll 25. A first feed mechanism 3 having
6 are installed to intermittently feed the first original fabric G, and are concentrically adjacent to the sides of both the first feed rolls 6 of the first feed mechanism 36 on the sides of the first feed mechanism 36. A pair of upper and lower second feed rolls 6 ′, a pair of upper and lower feed rolls 25 ′, which are concentrically adjacent to each other on the sides of the two feed rolls 25 of the first feed mechanism 36, and a large number of pairs. Second feeding mechanism 37 having spring belt 26 '
Is installed to intermittently feed the second original fabric G.
The outer end portion of the upper first feed roll 6, the outer end portion of the upper second feed roll 6 ', and the connecting portion of both upper feed rolls 6 and 6'are respectively pressed downward by a pressure cylinder 20. Is under pressure.

The output rotation of the first control motor 1 is transmitted to the first feed roll drive shaft 13 via the pulley and the belt, and the rotation of the first feed roll drive shaft 13 is transmitted to the lower first feed roll 6 via the pulley and the belt. To drive the first feed mechanism 36, and the output rotation of the second control motor 2 is transmitted to the second feed roll drive shaft 14 via the pulley and the belt.
Is transmitted to the lower second feed roll 6'through a pulley and a belt, and the second feed mechanism 37 is driven.

When setting the feed rate of the original fabric G, the feed length of the original fabric G for one time, the sealing time for sealing the original fabric G, and the percentage of the feed speed at the start of feeding with respect to the maximum feed speed are preset in the controller 30. When input, the rising time T0 to T1 from the transfer start time T0 until the maximum feed speed is reached,
That is, the rising angle and the deceleration stop times T2 to T3 from the maximum speed to the stop are calculated by the microcomputer, and the first control motor 1 and the second control motor 2 are shift-controlled based on the calculation results.

Further, when the original fabric G is transferred by the double feed mechanisms 36 and 37 to manufacture a bag, a bag making pattern for supplying the original fabric G in one row only to one of the feed mechanisms 36 (37) and two rows A bag manufacturing pattern in which the original fabric G is supplied in parallel to the double feed mechanisms 36 and 37 to produce a bag body having the same bag length (seal interval) in two lines, and a single row of the wide original fabric G is fed. Mechanism 36,
Four types of bag making pattern for supplying to 37, and bag making pattern for supplying two rows of original fabric G to both feed mechanisms 36, 37 in parallel to manufacture bag bodies having different bag lengths in two lines. The bag body can be manufactured according to the pattern selected from the bag making patterns.

A servo motor type third control motor 3 capable of gear shift control by a command signal from the controller 30 is installed in the lower rear portion of the frame 32, and an encoder 40 is attached to the third control motor 3. Output shaft 3 of third control motor 3
On the side of the connecting shaft 41 that is directly connected to a through the coupling 18, the reduction gear 5 for sealing and the speed reducer 4 for blades having the brake 16 and the clutch 17 attached to both sides are installed. Is transmitted to both speed reducers 4 and 5 via the pulley and the belt.

Above the sealing speed reducer 5, a sealing drive shaft 15 through which the output rotation of the sealing speed reducer 5 is transmitted via a sprocket wheel 27 and a chain is rotatably provided horizontally. A sensor actuating piece 58 having a protrusion 58a is attached to one end of the sensor 30 so as to face a sensor 59 for detecting a fixed position, and a detection signal transmitted by the sensor 59 is sent to the controller 30 each time the protrusion 58a approaches the sensor 59.
Be transmitted to.

Next, the seal bar drive mechanism will be described. A pair of front and rear cam shafts are rotatably mounted horizontally near the upper end of the frame 32 and the rotation of the sealing drive shaft 15 is transmitted through the sprocket wheel and the chain. Sealing cams 10 are respectively fitted to the left and right ends of 42, 42, and rollers 10a arranged at equal eccentric positions are attached to the sealing cams 10, respectively.

A pair of right and left laterally long elevating plates 43 are attached to both side surfaces near the center of the upper end of the frame 32 so as to be vertically movable.
Horizontally elongated guide holes 43a, into which the rollers 10a of the sealing cam 10 are fitted, are formed at the front and rear ends of both the elevating plates 43, and the upper outer surfaces of the elevating plates 43 have a square bar shape. The guide rails 43b are attached horizontally, and the lifting drive plates 43 are repeatedly moved up and down synchronously by the rotation of the sealing drive shaft 15.

A lower interlocking plate 44, which is vertically provided outside the both elevating plates 43, respectively.
Two pairs of upper and lower rollers 44a, which rotatably face each other on the upper and lower surfaces of the guide rail 43b, are axially supported while sandwiching the guide rail 43b, and the upper surface of the lower interlocking plate 44 is A notch 44b that opens upward is formed in the center. A pair of front and rear guide members 46 and a pair of left and right cylinder receivers 47 are provided above the lower interlocking plates 44.
Are attached to face each other, and cylinders 48 are respectively installed and fixed on the cylinder receivers 47 on both sides of
The piston shaft 48a of the cylinder 48 is always urged downward by compressed air.

The notch 4 of the lower interlocking plate 44 is provided below the both upper interlocking plates 49, which are vertically erected on the both lower interlocking plates 44 in a butt shape and engaged with both guide members 46 so that the front and rear edges can slide up and down.
A notch 49a opening downward is formed opposite to 4b, and a connecting piece 50 is attached to the piston shaft 48a of the cylinder 48 near the center of the upper interlocking plate 49.

Spacer 5 attached to the upper inner surface of both upper interlocking plates 49
A pair of left and right bearings 52 having an upwardly opening concave portion 52a at the center of the upper portion are attached to the inner side surface of the bearing 1.
In the slide holes 52b vertically penetrating the front and rear ends of the frame 2, the front and rear sides of the frame 32 are juxtaposed on the side edges of the frame 32.
A pair of guide bars 53 are respectively inserted, and the bearing 52 is held by both guide bars 53 so as to be slidable up and down, and a spring 54 externally fitted to the lower portions of both guide bars 53.
Is urged upwards.

The sealing drive shaft 15 is rotationally driven to drive the sealing cam 10.
When rotating, both lift plates 43, both lower interlocking plates 44, and both upper interlocking plates 4 respectively arranged on both sides of the frame 32.
9. Both bearings 52 move up and down integrally.

In order to weld the upper and lower films of the original fabric G linearly along the width direction at predetermined intervals, a sealing mechanism 2 is provided above the vicinity of the central portion of the frame 32 along the width direction of the original fabric passage 33.
3, the seal bar holder 5 installed above it
Shaft portions 55a are formed at the left and right end portions of 5, respectively,
Both the shaft portions 55a are fitted into the recesses 52a of the bearing 52 and are non-rotatably stopped by the pressing piece 52c, and the seal bar holder 55 is connected to the both bearings 52 so as to be able to move up and down jointly. It is supported by a holding letter.

Below the seal bar holder 55, a seal bar 8 for heat sealing, which is attached to the lower surface of the seal bar holder 55 via a bracket 56, is horizontally installed along the width direction of the raw fabric passage 33. A seal portion 8a is formed in a sharp shape at the lower end of the seal bar 8.

Below the seal mechanism 23, when the seal bar 8 descends to the sealing position near the bottom dead center, the original fabric G is held between the seal bar 8 and the seal bar 8 to prevent the original fabric G from escaping downward. Therefore, a pedestal 24 is installed horizontally above the upper end of the frame 23 below the upper part of the conveyor 9, and when the sealing cam 10 makes one revolution from the top dead center, the seal bar holder 55 and the silver 8 are both placed. It moves down and up once together with the bearing 52, and a part of the original fabric G is sealed between the seal bar 8 and the pedestal 24.

The seal bar 8 repeats an ascending / descending operation of descending from the top dead center to the seal position near the bottom dead center and rising again to the top dead center every time the sealing cam 10 makes one rotation. The piston shaft 48a of 48 moves upward by the compressed air flowing into the lower chamber of the cylinder 48, and the seal bar 8 retreats to a position above the top dead center, so that the raw fabric G is prevented from melting and softening.

The third control motor 3 is controlled to shift in three stages by the output signal of the encoder 40 while the seal bar 8 moves up and down once to drive the sealing cam 10 and the seal bar 8 in three stages. That is, as shown in FIGS. 13 and 14, when the sealing cam 10 rotates 360 ° and the seal bar 8 moves up and down once, while the transfer of the original fabric G is stopped, the sealing cam 10 moves. In the seal section A1 for lowering the seal bar to the seal position, the sealing cam 10 is rotationally driven at the first speed N1 over the rotation angle range of 70 °, the seal bar 8 is driven at a low speed, and the feeding of the original fabric G is started. Immediately before, the seal cam 10 raises the seal bar 8 from the seal position to near the middle position of the lifting stroke.
2, and the sealing cam 10 immediately after the feeding of the original fabric G is stopped.
In the intermediate section A4 in which the seal bar 8 is lowered from the vicinity of the intermediate position to the seal position, the sealing cam 10 is rotatably driven at the second speed N2 over the rotation angle range of 60 °, so that the seal bar 8 is operated at the medium speed. Driven, and
In the upper section A3 in which the sealing cam 10 raises the seal bar 8 from the vicinity of the intermediate position to the top dead center during the original feed and again descends to the vicinity of the intermediate position, the sealing cam 10 moves over the rotation angle range of 170 °. 3 is rotated at a speed N3, and the seal bar 8 is driven at a high speed (however, in this example, N1 <
Although N2 <N3 is satisfied, N1 becomes high speed depending on the type and thickness of the original fabric), and the above-described shift mode of the sealing cam 10 and the sealing bar 8 is repeated every one rotation of the sealing cam 10. The raw fabric G is transferred while the sealing cam 10 rotates 150 °, and the raw fabric feed is stopped while the sealing cam 10 rotates 210 °, and the seal bar 8 is moved to the sealing position at the midpoint of the raw fabric feed stop time. Displace.

In the controller 30, the original G sealing time, that is, the first
When the speed N1 and the feed length for one time are input, the microcomputer calculates the second and third speeds N2 and N3, and the shift control of the third control motor 3 is performed based on the calculation result.

Next, the blade driving mechanism will be described. The clutch 27 is directly connected to the output shaft 4a of the blade reducer 4 and is connected to the clutch 27.
The tool cam 11 is fitted on the tool driving shaft 29 that is rotated when excited, and the sensor actuating piece 60 having the protrusion 60a at one end of the tool driving shaft 29 faces the sensor 61 for fixed position detection. Each time the protrusion 60a approaches the sensor 61, a detection signal transmitted by the sensor 61 is transmitted to the controller 30.

The blade cam 11 is movably connected to a lower piece 12a of a pair of left and right swing levers 12 which are pivotally supported in front of the blade drive shaft 29 and which is swingable, via a connecting rod 63.

A fixed blade 62 is installed at the front end on the frame 32 and slightly in front of both the feed mechanisms 36 and 37.
At the front end of 2, a movable blade 7 facing the fixed blade 62 is installed so as to be vertically movable in cooperation with the fixed blade 61 to cut the raw fabric G at predetermined intervals. The upper end of a connecting rod 64 that is connected to the front piece 12b of the double swing lever 12 is connected to the end portion, and the movable blade 7 is moved in the same manner as the shift mode when the seal bar 8 is moved up and down every one rotation of the blade cam 11. In the speed change mode, the speed is controlled in three steps, and it is moved up and down once, and the original fabric G
Is disconnected.

Next, the operation and effect of the embodiment having the above-mentioned configuration will be described.

The bag making machine of this example has a first feed roll 6 which is rotationally driven by a first control motor 1 capable of gear shift control.
A feed mechanism 36, a second feed mechanism 37 having a second feed roll 6 concentrically adjacent to the side mold of the first feed roll 6 and rotatably driven by a second control motor 2 capable of gear shift control; The speed at which the sealing bar 8 is driven by the controllable third control motor 3 to move up and down between the sealing position and a position slightly above the sealing position, and the sealing bar 8 moves between the ascending and descending strokes. Each ascending / descending stroke so that the speed of ascending / descending between the position and a position slightly above the sealing position and the speed of ascending / descending of the seal bar 8 between the intermediate position and the top dead center position are different from each other. A seal bar drive mechanism for shifting the speed up and down in three stages and a blade for driving the cutting movable blade 8 driven by the third control motor 3 in a lift mode similar to the lift mode of the seal bar 8. A drive mechanism, the control motor 1,
Controller 3 for individually controlling the shift mode of 3
It has 0 and.

Therefore, the speed change mechanism for controlling the speed change of the double feed mechanisms 36, 37, the seal bar 8, and the movable blade 7 can be simplified, and the speed change control is performed so that the feed speed of the original fabric G is adjusted to the original fabric G, and It is possible to control the shift speeds of the seal bar 8 and the movable blade 7 in accordance with the original fabric G, and various shift modes can be diversified to adjust the original fabric G at a speed adapted to the type, thickness and feed length of the original fabric G. It can be precisely transferred and can be sealed and cut.

Further, in one intermittent feeding of the original fabric G, the rising time is set to match the original fabric G until the original fabric G reaches the maximum feed speed, and after the original fabric G is gradually increased and transferred, Since the feed mechanisms 36 and 37 can be shift-controlled so that the original fabric G is transported at a constant speed and then gradually decelerated to gradually stop the transport of the raw fabric G, the problem that the raw fabric G is illegally transported is solved. As a result, a bag having an appropriate shape can be stably manufactured at high speed.

In particular, the sealing time for the original fabric can be selected according to the type and thickness of the original fabric G, and the seal bar 8 can be moved up and down by shifting between sealing and before and after sealing. There is an effect that the original fabric G can be efficiently sealed in an appropriate sealing state to eliminate the sealing failure.

[Brief description of drawings]

The drawings show one embodiment of the present invention. Fig. 1 is a side view of a bag making machine, Fig. 2 is a plan view of the same, Fig. 3 is a front view of both feeding mechanisms, and Fig. 4 is a feeding mechanism. Enlarged side view, FIG. 5 is a plan view near the blade drive shaft, FIG. 6 is a plan view of each transmission mechanism,
FIG. 7 is the same side view, FIG. 8 is the same front view, FIG. 9 is the side view of the seal mechanism, FIG. 10 is the side view of the seal bar transmission mechanism, and FIG. 11 is the same cutaway front view. Is a diagram for explaining a feeding mode of the original fabric, and FIGS. 13 and 14 are diagrams for explaining a shifting mode of the sealing cam, respectively. 1 ... First control motor 2 ... Second control motor 3 ... Third control motor 6,6 '... Feed roll 7 ... Movable blade 8 ... Seal bar 30 ... Controller G ... Material

Claims (1)

[Claims] 1. A first feed mechanism having a first feed roll rotatably driven by a first control motor capable of gear shift control, and a first feed mechanism concentrically adjacent to the side of the first feed roll and capable of gear shift control. A second feed mechanism having a second feed roll that is rotationally driven by a second control motor, and a seal bar for sealing that is driven by a third control motor capable of gear shift control. The seal bar is located at the seal position and slightly above it. Between the position where the seal bar moves up and down, the speed where the seal bar moves up and down between the intermediate position of its lifting stroke and a position slightly above the seal position, and the seal bar between the intermediate position and the top dead center position. A seal bar drive mechanism that shifts the speed up and down in three stages in each lifting stroke so that the speeds of raising and lowering the space are different, and the third control motor. A blade driving mechanism for moving and moving a cutting blade for cutting in a manner similar to the manner of raising and lowering the seal bar; and a controller for individually controlling aspects of the control motors. Bag machine.