JPH0223523Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The invention is a device that opens a packaging bag and fills it with an object to be packaged. The present invention relates to a bag picking arm that takes out bags one by one and supplies them to a suction block, and a pair of suction blocks that pull apart and open the mouths of the supported bags.

(Prior art) This type of device that efficiently fills bags with items to be packaged basically consists of a bag stacking box in which a large number of bags are stacked, and a suction cup that sucks the bags in the bag stacking box. It consists of a bag feeding mechanism that takes out the bags one by one from the top and supplies them to the bottom of the hopper, and a bag opening mechanism that opens the bags under the hopper. As the top surface of the bag decreases, the top surface of the bag becomes lower, so the suction cup is fixed to the tip of the piston rod of the air cylinder so that the suction cup can reach the top surface of the bag even if the top surface of the bag becomes low.

(Problems to be solved by the invention, etc.) In conventional devices of this type, for example,
As shown in Japanese Patent No. 154699, an air cylinder for opening and closing the mouth of the bag is required in addition to the air cylinder for operating the suction cup, and the structure is therefore complicated.

In view of the above points, the present invention aims to simplify the structure by opening and closing the mouth of the bag using only an air cylinder that operates a suction cup.

(Means for Solving the Problem) In order to achieve the above object, the present invention supports a bar so as to slide horizontally on a guide block fixed to the upper part of the machine base, and one end of the bar is A slender movable suction block is fixed in a horizontally elongated shape, and the movable suction block is pulled toward the guide block by a spring so as to leave a gap between it and the guide block that is sufficient to receive a pawl plate, which will be described later. Further, a fixed suction block supported on the machine stand is placed in front of the movable suction block at a predetermined distance, and a bag is placed on each opposing surface of the two suction blocks by vacuum action. A cylinder is provided with a suction hole for suction, and a bag-picking arm is arranged in the lower area of the guide block so as to be able to swing up and down with a shaft as a fulcrum, and is fixed parallel to the bag-picking arm. A suction cup 9 is fixed to the tip of the rod via the claw plate, and the claw plate 8 is in a state where the piston rod 7 is contracted.
The gap between the guide block 15 and the lower moving block 17 is located on the rotational orbit of the movable suction block 17, and the suction surface of the suction cup 9 projects slightly in front of the suction surface of the movable suction block 17. Further, the upper surface of the bag is located at the position where the piston rod is pushed out toward the bag loading box below the bag picking arm.

(Function) By pushing out the piston rod of the cylinder, the suction cup provided at the tip of the piston rod attracts the bag in the bag stacking box, and the contraction of the piston rod separates the bag from other bags, When the bag picking arm is rotated in this state, the claw plate is automatically inserted into the gap between the guide block and the movable suction block, and the thickness of the movable suction block is slightly smaller than the thickness of the suction cup. The mouth edge of the bag faces the front of the movable suction block without any obstruction, and then when the cylinder is temporarily pushed out, the movable suction block approaches and separates from the fixed suction block due to the pushing force of the claw plate and the reaction force of the spring, and both It is possible to open the mouth of the bag adsorbed to the opposite surface of the block.

(Embodiment) In the embodiment shown in FIG. 1, a bag picking arm 1 is supported on the side surface of a machine base 2 via a shaft 3 in a swingable state. The machine base 2 also serves as a gear box, and as shown in FIG. 2, a crankshaft 4 provided inside the machine is connected to the shaft 3 via a crank rod 5, so that the rotation of the crankshaft 4 reverses the shaft 3. ing. Further, an air cylinder 6 is fixed in parallel to the bag picking arm 1, and a suction cup 9 of a predetermined length is fixed to the tip of the rod 7 of the cylinder via a claw plate 8. As shown in FIG. 3, the air cylinder 6 acts to move the suction cup 9 toward and away from the upper surface of the bag loading box 11 provided below the side of the machine base 2 as shown by arrow A. On the other hand, the suction cup 9 is connected to a vacuum source through a hose 12 connected to one end thereof, and can suction the bags B stacked on the bag loading box 11. Further, the inside of the bag picking arm 1 is sheath-shaped, and a guide rod 13 slidably installed in the sheath-shaped portion is connected to the claw plate 8 so that the rod 7 can smoothly slide. The end of the claw plate 8 is made to protrude slightly from above the suction cup 9.

A guide block 15 is fixed to the side of the machine in the upper region of the bag picking arm 1, and two rods 16, 16 are slidably passed through the block.
A movable suction block 17 having a width X' slightly thinner than the longitudinal thickness X of the suction cup 9 is fixed to one end of these rods, while a tension spring 18 is engaged with the other end of the rod 16. Said guide block 1
5 and the movable suction block 17, the movable suction block 17 is pulled toward the guide block 15 so as to leave a gap 19 sufficient for insertion of the claw plate 8. Further, a fixed suction block 21 is supported on the front of the machine base 2 via a bracket 20, and the fixed suction block 21 and the movable suction block 17 are opposed to each other with a predetermined distance maintained therebetween. Both of these blocks 17 and 21 have internal cavities and are connected to a vacuum source via hoses 22 and 23, and have suction holes 24 and 25 formed on their opposing surfaces. A hopper 26 that moves up and down is provided in the area.

First, in the first step, the suction cup 9 is pushed down in the direction of the arrow A by the action of the cylinder 6 in FIG. Pull it up into position.

Next, in the second step, the bag picking arm 1 is rotated in the direction of arrow C by the movement of the shaft 3 and moved upward to the position of the imaginary line 1a. At the upper limit position, the claw plate 8 is inserted into the gap 19 between the guide block and the movable suction block 17, and the edge of the bag B faces the front surface of the suction hole 24 of the movable suction block.

Next, in the third step, when the rod 7 of the cylinder 6 pushes out the claw plate 8 in the direction of the arrow as shown in FIG. The mouth edge of the extruded bag B is held between the fixed adsorption block 21 and the fixed suction block 21. As a result, the edges of the bag are sucked into the suction holes of the movable suction block 17 and the fixed suction block 21 from the front and back.

Next, in the fourth step, when the claw plate 8 and the suction cup 9 are pulled back by the cylinder 6 as shown in FIG. The mouth is wide open. Then, the hopper 26 is moved down to fill the packaged bag, and the bag picking arm 1 is returned in the direction of arrow D, that is, in the direction of the bag loading box.
Then, the communication with the vacuum source is cut off, and both blocks 17,
Remove the bag from 21.

(Effects) As described above, the bag opening action can be performed using the movement of the cylinder 6, which is a stroke mechanism for reliably picking up bags regardless of changes in the number of bags stacked on the bag stacking box 11. , there is no need for a dedicated power mechanism for opening the bag, which has the effect of simplifying the device and allowing it to be provided at low cost.

[Brief explanation of drawings]

Figure 1 is a perspective view showing an embodiment of the present invention, Figure 2 is a plan view of the previous figure, Figure 3 is a side view of the front figure, and Figures 4 and 5 are explanatory diagrams of the operation of the previous figure. . 1... Bag picking arm, 2... Machine base, 6... Air cylinder, 8... Claw plate, 9... Suction cup, 11... Bag loading box, 15... Guide block, 16... Bar material,
17...Movable suction block, 18...Tension spring, 21...Fixed suction block, 24...Suction hole, 25...Suction hole, 26...Hopper.

Claims (1)

[Scope of utility model registration request] A bar 16 is supported so as to slide horizontally on a guide block 15 fixed to the upper part of the machine base 2, and an elongated movable suction block 17 is fixed horizontally to one end of the bar. 17 was pulled towards the guide block 15 and held in position by a spring 18 so as to leave a gap 19 between it and the guide block 15 sufficient to receive a pawl plate, which will be described later, and was further supported on the machine base. A fixed suction block 21 is disposed on the front surface of the movable suction block 17, and suction holes 24 and 25 are formed on the opposing surfaces of the two suction blocks 17 and 21, respectively, for suctioning the bag by vacuum action. , the bag picking arm 1 is attached to the shaft 3 below the guide block 15.
A suction cup 9 is fixed via the pawl plate 8 to the tip of the rod 7 of the cylinder 6, which is arranged to swing vertically with the bag taker arm as a fulcrum and is fixed parallel to the bag picking arm. The gap between the guide block 15 and the movable suction block 17 is located on the rotational trajectory of the claw plate 8 when the suction cup 7 is contracted, and the suction surface of the suction cup 9 It is formed to protrude slightly in front of the suction surface, and the top surface of the bag is located at the position where the piston rod 7 is pushed out toward the bag placement box 11 below the bag picking arm 1. A bagging device featuring: