JPH0645361B2 - Packing machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a packaging machine for dispensing powder such as medicines or a predetermined number of powders and sequentially packaging the dispensed products.

"Prior Art" Conventionally, as such a packaging machine, Japanese Patent Publication No. 58-432
A packaging machine as described in Japanese Patent No. 83 has been proposed. This is because a traversing measuring moving body is installed in an appropriate place on the machine body, and a supporting column of a suitable height is erected at one end of this measuring moving body, and at a suitable distance from this supporting column, the measuring moving body is moved up and down in parallel with the vertical line of the supporting column. A position setting pestle having a required length for moving up and down in the direction is provided, and an inclined guide pestle is provided in which the base end is pivotally supported at the upper end of the column and the other end is loosely supported at the upper end of the position setting pes. The gear provided on the setting pestle is meshed with the rotary gear on the controller shaft that can maintain a fixed position, and the lifting force is not always applied. It is not urged, and the position of the measuring moving body is in the starting position.A vertical displacement sensor is installed in the adjacent position of the punch moving up and down. The above-mentioned se The upper end opening of the weighing container is associated with a feed mechanism consisting of a control unit and a return drive unit that intermittently move at an even interval at an arbitrarily set number up to the perpendicular line passing through the movable intersection point where the sir and the tilting guide pestle are in contact with each other. Is configured by additionally attaching a scraping plate mechanism linked to intermittent feeding.

In such a packaging machine, the ram (piston) is lowered to preset the volume in the weighing container, and then the weighing container (cylinder) is filled with the granular material to be treated, and then the set division number is set. The ram is raised in accordance with the above, and the powdery particles extruded upward from the open end of the weighing container are scraped off by the scraping plate mechanism.

"Problems to be solved by the invention" By the way, if air is present in the powdered or granular material to be filled in the weighing container, the density becomes uneven in each part in the weighing container, and in this state, a predetermined amount is obtained by the ram. If the powder is extruded upwards from the open end of the weighing container one by one, it is not possible to package the same amount in equal amounts, so it is necessary to pressurize the powder and granular material to be processed to discharge air. In the above packaging machine, a special movable pressurizing means is required as this means. Therefore, the device is complicated.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to pressurize a powder or granules to discharge air without providing a special movable pressurizing unit, and thus simplify the apparatus. It is to provide a packaging machine that can be realized.

[Means for Solving the Problem] In order to achieve the above-mentioned object, the packaging machine of the present invention has a weight that can be placed on the upper end of a cylinder, and that this weight moves upward from the upper end of the cylinder. After the sensor that detects and outputs the pressurization end signal, and after the granular material is supplied into the cylinder, place a weight on the upper end of the cylinder and raise the piston until the sensor outputs the pressurization end signal. And a pressurizing control unit for pressurizing the powder or granular material in the cylinder.

[Embodiment] An embodiment of the packaging machine of the present invention will be described below in detail with reference to the drawings.

In FIG. 1 and FIG. 2, reference numeral 1 is a flat plate-shaped base on which the cylinder 2 has its upper end aligned with the upper surface of the base 1 as shown in FIG. It is fixed by extending in the vertical direction. The lower end of the cylinder 2 is fixed to a flat lower base 3. A piston 4 is vertically slidably fitted in the cylinder 2. A ball screw shaft 5 is fixed to the lower surface of the piston 4. A nut 6 is screwed onto the ball screw shaft 5. The nut 6 has a sleeve 7 and a belt wheel 8
Is further fitted, and the rotating disk 9a of the rotary encoder 9 is brought into contact with the lower surface of the belt wheel 8, and these are integrally connected by screws or the like. The rotary encoder 9 is composed of a rotating disk 9a (see FIG. 3) in which the above-mentioned cutout 9b is formed, and an optical sensor 9c installed at a position sandwiching this rotating disk 9a. When 9b comes to the position of the sensor 9c, the optical path of the optical sensor 9c is formed through the notch 9b of the rotating disk 9a, and the detection signal is output when the light receiving element receives the light emitted from the light emitting element. . Reference numeral 10 denotes a bearing case fixed to the lower surface of the lower base 3. In the bearing case 10, the bearing 1
The lower parts of the components 1 and 11 are regulated and housed in a lid 12. The sleeve 7 is fitted in the inner diameters of the bearings 11 and 11, and the large diameter portion 7a of the lower portion of the sleeve 7 is
And the retaining ring 1 fitted in the groove formed in the upper part
An annular member 14 arranged below the bearing 3 restricts the bearings 11 and 11 from moving in the vertical direction. A stepping motor 15 is fixed to the lower base 3, and a small belt wheel 16 is fixed to a drive shaft of the stepping motor 15. A belt 17 is wound between the small belt wheel 16 and the belt wheel 8. Reference numerals 18 and 19 denote optical sensors for detecting the upper limit and the lower limit of the piston 4, respectively. When the tongue piece 20 fixed to the lower end of the ball screw shaft 5 comes to the position of these optical sensors 18 and 19, respectively. It is designed to output a detection signal. With the above configuration, when the stepping motor 15 is started, the belt wheel 8, the sleeve 7, the nut 6, the rotary encoder 9 are passed through the belt 17.
The rotating disc 9a of FIG. This raises or lowers the ball screw shaft 5 and thus the piston 4
Slides in the cylinder 2 upwards or downwards. When the piston 4 rises and reaches the upper limit (the position where the upper end of the piston 4 coincides with the upper end of the cylinder 2), the optical sensor 18 outputs a detection signal, and the control unit stops the stepping motor 15 based on this. . When the piston 4 descends and reaches the lower limit, the optical sensor 19 outputs a detection signal, and the control unit stops the stepping motor 15 based on this. When the piston 4 is lifted from the lower limit position, this lift distance can be obtained by processing the detection signal output from the rotary encoder 9 by the control unit. Therefore, from the upper end of the cylinder 2 to the piston 4
The distance to the upper end of the can be obtained, and thus the capacity can be obtained. Further, the piston 4 is raised and stopped by a predetermined distance based on the detection signal output from the rotary encoder 9 to intermittently move.

As shown in FIGS. 1 and 2, an opening 21 is formed in the base 1, and a hopper 22 is fixedly provided on the lower surface of the base 1 below the opening 21. Opening 21
The powder particles are intermittently dropped from the hopper 22 to the hopper 22 by a predetermined packaging amount, and then dropped into the packaging container 23 moving below the hopper 22 to be sequentially packaged.

In FIGS. 1, 4 and 5, 24 is a base 1
It is a motor that can be switched between forward and reverse rotation and is fixed to. As shown in FIG. 4, a belt wheel 25 is fixed to a drive shaft extending below the base 1 of the motor 24. Reference numeral 26 denotes a bearing case fixed to the base 1. In the bearing case 26, bearings 27, 27 are accommodated at predetermined intervals by a collar 28 and are prevented from coming off by a retaining ring 29. . A shaft 30 is rotatably fitted into the inner diameters of the bearings 27, 27, and a belt wheel 31 is fixed to the lower end of the shaft 30. Belt wheel 31 and the above belt wheel 2
A belt 32 is wound around the belt 5. Belt car 3
As shown in FIG. 5, a rotary disc 33a of the rotary encoder 33 is fixed to the lower surface of the plate 1 with screws. The rotary encoder 33 includes a rotary disc 33a in which the notch 33b is formed and three optical sensors 33c, 3c installed so as to sandwich the rotary disc 33a.
3d and 33e, and these optical sensors 33c, 33d and 33e are notches 3 of the rotary disc 33a.
The optical paths of the optical sensors 33c, 33d, 33e are formed through 3b, and the detection signal is output when the light receiving element receives the light emitted from the light emitting element. A cylindrical support member 34 having a flange portion 34a is fitted on the upper end of the shaft 30, and the lower end thereof is in contact with the end surface of the bearing 27 located on the upper side. As shown in FIG. 1, vertical grooves 34b ... Are formed in the upper end portion of the support member 34, and a substantially U-shaped tightening member 35 is fitted therein,
The shaft 30 is fixed to the support member 34 by tightening the tightening member 35 with bolts 36.
As shown in FIG. 4, a substantially elliptical support plate 37 is fixed to the lower surface of the flange portion 34 a of the support member 34, and one side of the support plate 37 is provided with the powder particles in the cylinder 2. A hopper 38 for supplying is fixed so that its lower end is slightly separated from the upper surface of the base 1, and a proximity sensor (sensor) 39 is fixed on the other side. A weight 40 is provided below the proximity sensor 39. The weight 40 has a projecting portion 40a fitted in a through hole 41a of a support member 41 fixed to the lower surface of the support plate 37 so as to be vertically movable, and follows the horizontal movement of the support plate 37 so as to move horizontally. It is supposed to move. An annular groove is formed at the upper end of the protruding portion 40 of the weight 40, and a snap ring is fitted in this groove. The upper surface of the weight 40 is the proximity sensor 39
Of the base 1 and the lower surface is in contact with the upper surface of the base 1. The proximity sensor 39 detects the movement of the weight 40 when the weight 40 moves upward by a predetermined distance or more, and outputs a pressurization end signal. When the pressurizing end signal is output, the pressurizing controller (not shown) stops the stepping motor 15 to stop the piston 4 from rising. The hopper 38 and the weight 40 are controlled so as to operate as follows. That is, the motor 2
By driving the shaft 4, the shaft 37 rotates, which causes the support plate 37 to rotate. When the support plate 37 rotates in the X direction in FIG. 1, when the hopper 38 is positioned on the cylinder 2, the rotary disk 33 of the rotary encoder 33 is rotated.
The notch 33b of a comes to the position of the optical sensor 33c and outputs a detection signal, whereby the motor 24 is stopped. When the support plate 37 is rotated in the Y direction and the weight 40 is located on the cylinder 2, the notch 33b of the rotary disc 33a of the rotary encoder 33 is inserted into the optical sensor 33.
It comes to the position of c and outputs a detection signal.
4 is set to stop. From the above state, the support plate 37 is rotated in the opposite direction to rotate the optical sensor 33d.
Thus, the motor 24 is stopped, and the hopper 38 and the weight 40 are returned to the original positions from above the cylinder 2.

In FIGS. 1 and 6, reference numeral 42 denotes a motor fixed to the base 1, and the motor 1 has a base 1
The rotary arm 43 is fixed to the drive shaft projecting upward. A substantially U-shaped blade 44 is fixed to the rotary arm 43 in plan view. Reference numeral 45 denotes an optical sensor arranged at a predetermined position so as to sandwich the standing piece 44a of the blade 44.
When the light emitted from the light emitting element of the optical sensor 45 at the position 5 is blocked by the standing piece 44a, a detection signal is output. When the motor 42 is started, the rotary arm 43 rotates in the Z direction in FIG. 1, and accordingly, the blade 44 slides on the base 1 and returns to its original position through the cylinder 2 and the opening 21. The sensor 45 outputs a detection signal at this position, and the motor 42 is stopped based on this.

Next, a packing operation by the packing machine configured as described above will be described based on FIGS. 7 to 10.

First, as shown in FIG. 7, the piston 4 is lowered to the lower limit position, and in this state, the hopper 38 is moved onto the cylinder 2 so that a prescribed amount of the powder or granules F corresponding to the number of packages is obtained. Supply into the cylinder 2.

Next, as shown in FIG. 8, the weight 40 is moved onto the cylinder 2 and then the piston 4 is raised. By doing so, the powder or granular material F in the cylinder 2 is pressurized, and accordingly, the air located above the powder or granular material F in the cylinder 2 is pressurized, and this air pressure weights 40. Weight over 40
Floats slightly above the upper ends of the base 1 and the cylinder 2, and the air is discharged from the gap between the base 1 and the weight 40. Then, when the piston 4 further rises and the air between the granular material F and the weight 40 becomes very small or disappears, a large load acts on the weight 40 and the weight 40 becomes a predetermined value. When a large amount of upward movement occurs, the proximity sensor 45 detects this movement and outputs a pressurization end signal. When this signal is output, the pressurization control unit stops the rise of the piston 4. At this time, the amount of the powder F in the cylinder 2 is calculated by the control unit based on the detection signal output from the rotary encoder 9. When the piston 2 is stopped, the density gradient of the powdery material F is made constant, and the upper end of the powdery material F is flattened.

Next, after moving the weight 40 from the top of the cylinder 2 and returning it to a predetermined position, the piston 4 is raised to move the powder or granular material F upward from the cylinder 2 by a predetermined packing amount as shown in FIG. Extrude to. In this case, paying attention to the fact that the density of the powder or granules F becomes larger in the lower part of the cylinder 2 and becomes substantially proportionally smaller in the lower part of the cylinder 2 by the above-mentioned pressurizing operation.
The ascending distance corresponding to the one packaging of the powder is initially large and then proportionally reduced so as to correspond to the density gradient of the granular material F, whereby the packaging is performed more accurately by the predetermined amount. .

The blade 44 is rotated in conjunction with the powder particles F being pushed upward by a predetermined amount in the cylinder 2, and the pushed powder particles F are slid off from the upper end of the cylinder 2 to form the base 1
It is dropped from the opening 21 into the hopper 22, and then dropped into the packaging container 23 moving below the hopper 22 to sequentially perform packaging.

In such a packaging machine, since the powder and granules F are pressurized by the weight 40 and the piston 4 used to send the powder and granules F to the upper side of the cylinder 2, a special movable unit is provided. Since no pressurizing means is required, there is an advantage that the device can be simplified. Moreover, since the piston 4 ascends from below to pressurize the granular material F, the weight 40 slightly floats due to the increase in the air pressure at the upper part of the granular material F generated during pressurization, and the powder 40 comes out from this gap. The air in the granules F can be effectively discharged. In addition, the weight 40 allows the powder F
The top of the can be flat. Further, a proximity sensor 39 and a pressurization control unit are provided, the proximity sensor 39 detects that the weight 40 has moved upward, and a pressurization end signal is output. Four
Since the rise of the powder is stopped, it is possible to appropriately pressurize the powdery material F.

Further, since the amount of the powder or granules F is obtained after pressurizing the powder or granules F supplied from the hopper 38 into the cylinder 2, the volume of the cylinder is set in advance as in the conventional case, and the predetermined packaging amount is set. Since the total amount of the reference before dividing is more accurate than in the method of dividing into two, it is possible to perform packaging in equal amounts more accurately.

Also, paying attention to the fact that the density of the granular material F increases under the cylinder 2 by the pressurizing operation and decreases in proportion as it goes up, and the rising distance corresponding to one packet of the piston 4 is increased. In order to correspond to the density gradient of the granular material F, it is set to be large initially and then proportionally smaller, so that it is possible to perform packaging in equal amounts more accurately.

Further, since the ascending distance of the piston 4 is set based on the detection signal of the rotary encoder 9, there is an advantage that the granular material F can be easily divided without using a complicated mechanism.

"Effects of the Invention" As described above, in the packaging machine of the present invention, the pressurization of the granular material is performed by the weight and the piston used for sending the granular material upward of the cylinder. For,
There is an advantage that the device can be simplified because no special movable pressing means is required. Moreover, the air in the powder / granular body can be effectively discharged from the gap formed by the floating of the weight when the piston rises from below and pressurizes the powder / granular body. Moreover, the weight can flatten the upper end of the granular material. Further, a sensor and a pressurization control unit are provided, the sensor detects that the weight has moved upward, and outputs a pressurization end signal, and the pressurization control unit stops the rise of the piston based on this signal. As a result, it is possible to properly pressurize the powder or granular material.

[Brief description of drawings]

1 to 6 are views showing an embodiment of a packaging machine of the present invention. FIG. 1 is a plan view of a main part, FIG. 2 is a longitudinal sectional view of a cylinder part, and FIG. 2 is a bottom view of the main part of FIG.
The figure is a vertical cross-sectional view of the weight and the hopper, FIG. 5 is a bottom view of the main part of FIG. 4, and FIG. 6 is a vertical cross-sectional view of the blade part. 7 to 10 are views for explaining the packing operation by the packing machine according to the present invention. 2 ... Cylinder, 4 ... Piston, 39 ... Proximity sensor (sensor), 40 ... Weight, 44 ... Blade, F
...... Powder.

Claims (1)

[Claims] 1. A piston is provided below the inside of a cylinder to which the powder or granules are supplied from above, and the piston is intermittently raised to push the powder or granules upward by a predetermined amount into the cylinder, In a packaging machine for intermittently scraping and packaging the extruded powder and granular material with a blade, a weight that can be placed on the upper end of the cylinder, and that this weight has moved upward from the upper end of the cylinder. And a sensor that outputs a pressurization end signal, and after the powder or granular material is supplied into the cylinder, the weight is placed on the upper end of the cylinder and the sensor outputs a pressurization end signal. And a pressurizing control unit that pressurizes the powder and granules in the cylinder.