JPS6231370Y2 - - Google Patents

Description

[Detailed description of the invention] This invention involves filling a net bag or an airtight synthetic resin bag with the contents, and then tightening the neck of the bag and driving a U-shaped binding fitting to the neck of the bag. This invention relates to a bag binding machine that clinch and bind the neck of a bag by cooperating with a clincher and a clincher, and particularly relates to a cutter locking device that cuts off a tip end portion shorter than the neck of a bag clinched by a binding metal fitting.

Generally, a pneumatically driven bag stitching machine is provided with a cutter for clinching the neck of the bag and then trimming the end portion of the bag shorter than the neck.
The cutter is integrally connected to a cutter piston of a double-acting cutter cylinder device, and the cutter cylinder device is controlled by a mechanically operated master valve. The mechanical operating means for the master valve for the cutter is a driver that operates the master valve for the cutter during its forward stroke.

2. Description of the Related Art Conventionally, as a device for locking a cutter of a bag binding machine, a device is known in which a compressed air passage leading to the forward side of a cutter cylinder device is closed by a lock. However, according to this device, the master valve for the cutter is inevitably operated mechanically as the driver advances, resulting in a large amount of compressed air being used ineffectively, and the locking operation being unreliable. It was hot.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cutter lock device for a bag stitching machine that does not use compressed air ineffectively and has high reliability in lock operation.

Hereinafter, preferred embodiments of the present invention will be described based on the drawings. FIG. 1 is a partially cutaway vertical sectional view showing the entire bag stitching machine 2 equipped with a cutter lock device 1 of the present invention. This bag stitching machine 2 has a body 3 whose side profile is approximately a right triangle, and on the oblique side of the right triangle body 3, a driver advancement/retraction driving part 4, a blade-shaped driver 5, a focusing guide member 6, Clincher 7 and clincher position adjustment device 8
are arranged sequentially.

The driver advancement/retraction drive unit 4 includes a main cylinder 9 into which compressed air is introduced, a double-acting main piston 10 that is slidably housed in the main cylinder 9 and reciprocated by the compressed air; It has a sub-piston 11 and a push rod 12 which are paired with the main piston 10 to assist in operation. main piston 10
is integrally connected to the driver 5 via a hollow piston rod 10a and a driver holder 10b. The sub-piston 11 is one binding metal fitting 1
3 from the row of binding metal fittings connected in series in parallel, the main piston 10 is pushed downward by a certain stroke from the position shown in FIG. The push rod 12 is integrally connected by a bolt 15 to a slide guide 14 that conveys the binding fitting 13 toward the bending groove 7a of the clincher 7 in cooperation with the driver 5. The maximum amount of advance of the main piston 10 is regulated by a main piston stopper 16 fitted into the front end of the main cylinder 9.

A forward compressed air passage 17 and a backward compressed air passage 18 are connected to the rear end side and the front end side of the main cylinder 9, respectively. A main valve 19 is provided between the forward compressed air passage 17 and the backward compressed air passage 18.
9 is operated by a trigger valve 20 as a trigger means (see FIG. 2).

A binding fixture guide 21 is fixed to the body 3 at a constant distance from the slide guide 14 and below the slide guide 14, and works together with the slide guide 14 to hold the binding fixture 13 so that it does not fall. .

The front part of the body 3 (in Fig. 1, the body 3
A clincher holder 22 is integrally connected to the body 3 at the left end portion of the body 3. A clincher moving groove 23 is formed in this clincher holder 22, and a clincher 7 is formed in this clincher moving groove 23.
is inserted so that it can slide freely. Clincher 7
The leg portion of the binding fitting 13 is bent in the bending groove 7a.

The fixed position of the clincher 7 is adjusted by an adjustment block 25 moved by a screw 24a.

The focusing guide member 6 is constructed by integrally joining two focusing guide plates 6a of the same shape on the left and right,
The whole thing is almost bird-shaped. In the area corresponding to the bird-shaped head, a wide upper focusing tongue 24 and a narrow lower focusing tongue 25 are placed with a gap 26 at a constant interval from the upper focusing tongue 24. It is provided.

The focusing guide member 6 is pivotally supported by a fixed pivot 27 fixed to the body 3 at a portion corresponding to the bird-shaped rear upper part of the focusing guide member 6 .

A trigger lever 29 is fixed to the focusing guide member 6 at a portion corresponding to the lower portion of the bird-shaped rear tail side of the focusing guide member 6, and is pivotally supported relative to the body 3 by a movable pivot 28 whose position is movable. .

At a position above the fixed pivot 27, an inner cutter lever 30 and an outer cutter lever 3 are provided.
A fixed pivot 32 is provided on the body 3 for pivotally supporting the body 3.

A torsion coil spring 33 is interposed between the fixed pivot 32 and the hole 6c on the upper surface side of the focusing guide member 6 in a state where it is mounted on the fixed pivot 27. As a result, the focusing guide member 6 is always elastically biased clockwise in FIG.

On the other hand, in the focusing guide member 6, the lower focusing tongue 25 is connected to the clincher 7 by a stopper (not shown).
Rotation is restricted so that it remains at a position above.

A torsion coil spring 34 is interposed between the inner cutter lever 30 and the outer cutter lever 31 which are pivotally supported on the fixed pivot 32, and is mounted on the fixed pivot 32. As a result, the inner cutter lever 30 and the outer cutter lever 31 are moved in the direction in which the space between them is more open.
0 and 31 are elastically biased.

On the other hand, a stopper (not shown) prevents the inner cutter lever 30 and the outer cutter lever 31 from opening more than a certain angle (see FIG. 3).

The bent end side 30a of the inner cutter lever 30 normally stands still and protrudes toward the driver 5. At this time, the other bent end side 30b of the inner cutter lever 30 overlaps and is in contact with the bent other end side 31b of the outer cutter lever 31.

One bent end side 31a of the outer cutter lever 31 faces the tip end surface 36a of the valve stem 36 of the trigger valve 35, and this tip end surface 36a
Disconnect with.

At a lower position of the valve stem 36, a bar-shaped cutter stopper 37 having a substantially rectangular cross section is supported by the valve housing portion 38 of the body 3 in a freely rotatable state. The cutter stopper 37 has a long side 37a of the rectangular cross section standing up with respect to the front side 38a of the valve storage part 38, and a short side 37a of the rectangular cross section
The shaft is rotatably installed so that it can be in either the upright position or the upright position.

In the state shown in FIG. 3 in which the short side 37b of the cutter stopper 37 is upright, the one end side 30a of the inner cutter lever 30 is rotated counterclockwise in FIG. 3 by the driver holder 10b. 3, the outer cutter lever 31, which is rigidly connected to the inner cutter lever 30 by a stopper (not shown) and a torsion coil spring 34, is rotated counterclockwise in FIG. As a result, the outer cutter lever 31 is
Push the valve stem 36 of the trigger valve 35 to the right.

In the state shown in FIG. 4 in which the long side 37a of the cutter stopper 37 is upright, the tip of the long side 37a rotates the one end side 31a of the outer cutter lever 31 by a certain amount in the clockwise direction. On the other hand, since the outer cutter lever 31 is always elastically biased counterclockwise by the torsion coil spring 34, the outer cutter lever 31 is in a locked state at the position shown in FIG. In this locked state, the outer cutter lever 31
is the valve stem 36 at the left end position (top dead center)
It also does not come into contact with the tip end surface 36a. Therefore, even if the one end side 30a of the inner cutter lever 30 is rotated counterclockwise in FIG. 5 by the driver holder 10b, the torsion coil spring 34 is only compressed and the position of the valve stem 36 is No change occurs.

Katsuta Stoppa is the above Katsuta Stoppa 3.
In addition to the bar-shaped type shown in 7, it may also be a type that is attached to the front side 38a of the valve storage part 38 only when it is necessary to lock the cutter, so that even if the inner cutter lever 30 rotates, the valve Any device may be used as long as it holds the outer cutter lever 31 so that the stem 36 is not pressed.

The trigger valve 35 and the cutter master valve 39 are constructed on the same axis and are arranged in series.

First valve sleeve 4 of the trigger valve 35
0 is provided with one output port 41, and the second valve sleeve 42 is provided with one input port 43.

The trigger valve stem 36 also includes a first O
The ring 44 is attached and the second valve sleeve 42
A second O-ring 45 is attached to the side.

The valve sleeve 46 of the cutter master valve 39 has a pilot port 47, a first exhaust port 48, a first output port 49, and a first input port 5 in order from the side closest to the trigger valve 35 to the side farthest from the trigger valve 35.
0, a second output port 51, a second exhaust port 52, and a second input port 53 are provided.

The input port 43 of the trigger valve 35 and the pilot port 47 of the cutter master valve 39 are always in communication.

In addition, input port 43, pilot port 4
7. First input port 50 and second input port 53
We are also in constant contact.

The first output port 49 is connected to the cutter cylinder device 5
The second output port 51 is connected to the backward input port 56 of the cutter cylinder sleeve 55 of No. 4, and the second output port 51 is connected to the forward input port 57 of the cutter cylinder sleeve 55.
is in contact with.

The operation of the cutter lock device of the present invention will be explained below.

First, as shown in FIG. 3, during the forward stroke of the driver 10, the outer cutter lever 31
However, when the trigger valve stem 36 is pushed to the right, communication between the input port 43 and the output port 41 of the trigger valve 35 is cut off by the second O-ring 45, and the output port 41 communicates with the atmosphere, so pilot port 4
7 is not supplied with compressed air. Therefore, the valve stem 58 of the master valve 39 for cutters is moved to the left end position (top dead center) by the compressed air supplied to the second input port 53, and is kept stationary at that position. As a result, the first input port 50, the second output port 51, and the forward input port 57 communicate with each other, so the cutter piston 59
is moved to its most advanced position and locked in that position by compressed air.

Then, as shown in FIG. 5, if the outer cutter lever 31 is locked so as not to push the trigger valve stem 36 even during the forward stroke of the driver 10, the input port 43 of the trigger valve 35 and It communicates with the output port 41, and since the output port 41 is sealed against the atmosphere by the first O-ring 44, compressed air is also constantly supplied to the pilot port 47. The valve stem 58 is moved to the right end position (bottom dead center) by the force of the compressed air and the compression coil spring 60, and is stopped at that position. This results in
Since the first input port 50, the first output port 49, and the retraction input port 56 communicate with each other, the cutter piston 59 is moved to its most retracted position, and
It is locked in that position by compressed air. Therefore, the piston rod 59 of the cutter piston 59
The cutter 60 attached to the tip of the bag remains locked at its most retracted position, and does not cut the portion of the bag that is closer to the tip than the neck.

As described above, according to the present invention, the reliability of the cutter lock operation is improved by regulating the rotation of the outer cutter lever by the cutter stopper so that the outer cutter lever does not press the valve stem of the cutter valve. This is an improvement over the closed method, and since the cutter valve is not operated at all during the driver's forward stroke, there is no ineffective use of compressed air.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway vertical cross-sectional view of a bag binding machine according to the present invention, FIG. 2 is a pneumatic circuit diagram of the bag binding machine, and FIG. 3 is a cutter lock device of the present invention in a non-operating state. 4 is a perspective view of the cutter lock device in the non-operating state, FIG. 5 is a longitudinal sectional view of the cutter lock device in the operating state, and FIG. 6 is a longitudinal sectional view of the cutter lock device in the operating state. FIG. 3 is a perspective view of the cutter lock device. 1... cutter lock device, 2... bag binding machine, 3
...Body, 5...Driver, 7...Clincher, 13...Binding fittings, 30...Inner cutter lever, 31...Outer cutter lever, 34...
...Torsion coil spring, 35...Trigger valve, 36
...Valve stem, 37...Katsutastoppa, 3
9...Katsuta master valve, 54...Katsuta cylinder device, 56...Reverse input port, 60...
...Katsuta.

Claims (1)

[Scope of utility model registration request] A clincher installed at a fixed position on the body and a driver driven forward or backward by compressed air bend the U-shaped binding fitting in a closed loop to bind the neck of the bag and control the cutter cylinder device and this cutter cylinder device. A cutter driven forward or backward by a cutter valve to cut off a portion of the bag closer to the end than the neck, and the valve stem of the cutter valve is rotated in conjunction with the forward stroke of the driver. In a cutter lock device incorporated in a bag binding machine that can be pressed and operated by a cutter lever, the cutter lever is composed of an inner cutter lever that is rotatably operated by a driver and an outer cutter lever that can press the valve stem. The outer cutter lever is always elastically biased in the direction of expanding the distance between the two levers by a spring inserted between the levers, and a cutter stopper is provided near the cutter valve. The cutter stopper holds the outer cutter lever against the spring in a position where the outer cutter lever does not press the valve stem of the cutter valve, thereby supplying compressed air to the retreat input port of the cutter cylinder device. A bag binding machine's cutter lock device maintains its condition.