JPH069823B2 - Quantitative material cutting device for rubbers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a quantitative material cutting device for rubbers.

<Prior Art> When a rubber is press-fitted into a mold to make a product, the rubber material (blank) is required to completely fill the mold and not have an excessive volume.

As a conventional device for mass-producing such a quantitative material, A. JP-B-54-21385 "Plastic extrudate periodic cutting device" B. JP-B-57-55563 "Extruder" C.I. There is JP-A-60-46226 "Ram Extruder" and the like.

“A extrudes the material at a fixed volume ratio through a die,
In a known device that repeatedly cuts an extruded material at the same time interval at the point of exiting the die, a blade drive mechanism was devised to shorten the time the blade closes the die outlet during cutting. , B is a similar device, especially with the addition of a vacuum pump and a two-speed ram of the extrusion device, and C is a mechanism for removing air from the material fed to the same device.

<Problems to be Solved by the Invention> All conventional quantitative material manufacturing apparatuses "extrude a substance at a constant volume ratio through a die, and ... repeatedly cut the extruded material at the same time intervals." That is, it is extruded at a constant speed and cut at the same time intervals.

This method produces mass of the same volume of material, but there is no guarantee that the volume is appropriate. If a field engineer erroneously adjusts the extrusion speed or cutting time interval, defective products will be mass-produced. Therefore, engineers and managers must constantly inspect mass-produced materials.

It is an object of the present invention to eliminate the above-mentioned anxiety of site personnel and the fear of mass production of defective products.

<Means for Solving the Problems> (1) of the device for cutting out quantitative materials of rubber according to the present invention is such that the extruding cylinder is filled with the rubber material, and the material is extruded to the required cross-sectional dimension by the piston, and the extruded material is extruded. In a device that cuts one after another with a blade along the outlet and mass-produces quantitative materials, a probe that moves in synchronization with the pushing movement of the piston,
The amount of movement of the probe, characterized in that, each time the length corresponding to the amount of movement of the piston for pushing out the material for one quantitative material reaches a movement amount detector that outputs an electrical signal,
Similarly (2), in addition to the device of (1), when the continuous swivel blade or reciprocating blade that is the blade passes through the fixed point such as the front face of the extrusion port and other fixed points, a blade edge detector that outputs an electric signal and the movement amount detection. Device, receiving the electric signal of both the blade edge detector, so as to eliminate the difference in the period of each of the two signals, characterized by comprising a synchronous control device for instructing the drive control unit of the piston or the rotating blade, the same ( 3) In the device of (1), the blade repeats the cutting operation in synchronization with the electric signal of the movement amount detector. It is characterized by doing so.

<Action> Conventionally, the extrusion speed and the cutting time interval were first adjusted to obtain the required quantitative material, and thereafter, in principle, the blind mass production method was to keep a constant speed and a constant interval. This invention cuts out after confirming the size of each piece.

That is, the present invention captures the movement of the piston in its entirety or as an expanded probe movement. Then, when the piston moves by the amount of extrusion movement required to extrude the material for the target quantitative material (this can be obtained by calculation or experiment), the amount of movement of the probe corresponding to this is calculated, and the probe is The movement amount detector emits an electric signal each time it moves (the pushing cylinder is, of course, a right cylinder).

Between this electric signal and the next electric signal, the material is extruded by one quantitative material. Therefore, if the extruded material is divided on the basis of this measurement signal, the volume of each extruded material is confirmed and cut, and the anxiety of conventional blind work is released. This is the invention of claim (1).

As the usage of the electric signal, (a) the cutter is started and cut by the signal, (b) the existing device in which the cutter is continuously turning, the present invention is added as a monitoring means, and the movement amount detector The operator or machine is adjusted so that the electrical signal and the actual cutting cycle are the same, (c) this invention is also added to the conventional device, but it is not just a monitoring means,
These are mainly three, which have an automatic control device that keeps the cycle of the above signals and the cycle of actual cutting the same.

The invention of claim (2) belongs to the above usage (c). In addition to the above-mentioned movement amount detector, a blade tip detector that outputs a signal when a continuously swiveling or reciprocating blade passes a fixed point such as the front face of the extrusion port is added, and the signals of both detectors are sent to the synchronous control device. send. Therefore, the periods of both signals are compared, and the period control device issues a command to the drive control unit of the piston or the rotating blade until the periods match, and the drive is accelerated or slowed to synchronize. As a result, after one cut, the turning blade cuts the material at the moment when the piston extrudes the material for the next fixed quantity material, and the accurate fixed quantity material is mass-produced.

The invention of claim (3) can be applied to any of the above usages (a) (b) (c). It is needless to say that the cutting tool, whether reciprocating or swiveling, is configured to cut in synchronization with the signal from the movement amount detector.However, the present invention provides a prior signal immediately before the cutting operation of the cutting tool. Is issued, thereby instructing the drive control unit of the piston to reduce the extrusion speed.
Since the cutting operation is performed while the temperature is decreasing, the amount of the material stopped by the blade is reduced, the cutting edge is improved, and the cutting accuracy is improved. After cutting, restoring the extrusion speed is
Needless to say.

<Embodiment> FIG. 1 is an explanatory view of an embodiment of the present invention, in which 1 is an extrusion cylinder, 2 is an extrusion port, 3 is a piston, 4 is a piston rod, 5 is a cutter, 6 is a cutter driving unit, and 7 is a cutter. In the fluid cylinder that reciprocally drives the piston 3, the material in the extrusion cylinder 1 is A, and the cut-off quantitative material is B.

The open rear end of the extrusion cylinder 1 is connected to the front end surface of the fluid pressure cylinder 7 via a guide cylinder 8 having the same diameter as the cylinder 1 and having a probe guide groove 8a. A material supply port 9 to the extrusion cylinder 1 is provided at a position between the guide cylinder 8 and the extrusion cylinder 1.

In this embodiment, the probe support member 10a is attached to the piston rod 4.
The base end of is fixed and the probe 10 is attached to the tip.

Therefore, the probe 10 horizontally moves so as to take out the movement of the piston 3 as it is, and the horizontal movement is measured by the movement amount detector 11 which is a precision length measuring device. The tip of the probe 10 moves along the detector 11, which is a precision length measuring device, and the piston moves to the fixed material B.
The detector 11 emits an electric signal each time the length for pushing out one material is reached.

The amount of movement of the piston 3 for extruding one quantitative material B can be easily calculated from the ratio of the inner diameter of the extrusion cylinder 1 and the inner diameter of the extrusion port 2. Since it is normally in mm, a precision length measuring device is used in this embodiment. However, if the movement amount of the piston 3 is taken out through an expansion mechanism, the movement of the probe 10 becomes large. Alternatively, the movement amount detector 11 may be arranged side by side.

How to use the electric signal of the movement amount detector 11, as described above, (a) start the blade, (b) monitor means, (c) synchronize the signal and disconnection by automatic control However, the embodiment of FIG. 1 belongs to (a). That is, the electric signal of the movement amount detector 11 is sent to the drive control unit 6a of the blade drive unit 6 (pneumatic cylinder connected to the pneumatic pressure source 15) to activate the stationary blade 5 and exit from the extrusion port. The fixed amount of material A is cut off to obtain a fixed amount of material B.

The signal to start the stationary blade 5 and the actual blade 5
There is a delay between the disconnection and the disconnection. Therefore, in the embodiment shown in FIG. 1, the blade 5 is provided with a blade edge detector 12 which is transmitted at the moment when the blade 5 actually crosses the front surface of the extrusion port 2, and the signal is sent to the cutting delay compensator 14 for the next cutting. , Store the necessary correction amount. When the signal from the movement amount detector 11 enters the synchronous control device 13, a signal for synchronizing the blade driving unit 6, which is a pneumatic cylinder, is issued. The delay compensator 11 corrects the delay amount of the operation in the previous cutting. The drive control unit 6a is caused to operate the feed blade drive unit 6 at the corrected standard cycle every time. The delay corrector 14 may be omitted.

In order to apply the invention of claim (3) to the embodiment shown in FIG. 1, the same detector 11 or a separate detector 11 may be provided immediately before the signal issued by the movement amount detector 11 when the material for one quantitative material B is extruded. An advance signal is output by the detector provided, and the advance signal is sent to the drive control section 7a of the fluid pressure cylinder 7 as shown by the chain line in FIG. Therefore, since the throttle valve in the control unit 7a is throttled, when the movement of the piston 3 of the cylinder 7 becomes slow, the original signal of the movement amount detector 11 is output and the blade 5 performs the cutting operation. Immediately thereafter, the drive control section 7a is provided with a reset means such as a timer so that the throttle valve is immediately returned and the piston 3 is returned to the normal moving speed.

Therefore, although not shown, the drive control unit 7a of this embodiment has three fluid paths between the fluid pressure source 16 and the fluid pressure cylinder 7,
Each is equipped with a throttle valve and an electric valve so that the piston drive speed can be switched between three types: fast, steady, and slow. The high driving speed is used when the material is put into the extrusion cylinder 1 from the material supply port 9, the steady state is used when the material extrusion cutting operation is started, and the slow speed is used when the extrusion speed is decreased just before the cutting.

The method of decreasing the extrusion speed of the piston 3 by the advance signal can be applied to both the reciprocating blade of FIG. 1 and the revolving blade of FIG.

A front view of the blade 5 shown in FIG. 1 is shown in FIG. 2. In this example, the cut-off blade 5 has to be pulled up quickly and put on standby. Since the piston 3 continues to push, the return of the blade 5 is rushed. However, if the blade tip of the blade 5 is directed vertically as shown in FIGS. It is not necessary to return the blade 5 every time.

Like the conventional device, the embodiment shown in FIG. 5 is of a type in which a plurality of blades 5 radially protruding are continuously swirled to successively cut off the material, and the invention of claim (2) is applied. ing.

In this case, a blade edge detector 12 is attached to the tip of the downward pushing cylinder 1 so as to face the passage of the blade 5, and a signal and a movement amount detector generated at the moment when the blade 5 passes the front surface of the extrusion port 2 are detected. The signal from 11 enters the synchronous control device 13 '. In this synchronous control device 13 ', the transmitting cycle of each of the detectors 11 and 12 is measured, and the pushing speed of the piston 3 and the continuous turning speed of the blade 5 are adjusted to keep the both cycles equal. An example is a cutting edge detector so that both signals are transmitted simultaneously every time.
If the signal of 12 is late, the blade drive control unit 6a is accelerated, and conversely, if it is too early, the blade is slowed down.

Although each invention and one embodiment have been described above, the embodiment can be variously changed and applied by well-known techniques of machine designers.

<Effects of the Invention> The present invention shows that the conventional quantitative material cutting device does not have a weighing function for each quantitative material to be cut out, and relies solely on the machine adjustment by the field engineer and the sampling inspection after cutting out. I took it as a problem and opened the way to mass-produce quantitative materials for the first time by weighing each piece.

That is, the invention of claim (1) takes out the movement of the piston of the extrusion cylinder of the rubber material as the movement of the probe, and each time the piston pushes out the material for one quantitative material, the probe detects the movement amount detector. Since the electric signal is sent, the blade that cuts the extruded material is activated by the electric signal, the movement of the rotating blade is monitored in comparison with the electric signal, and it is used as a guide for manual speed adjustment, or the weighing automation of conventional equipment is used. Opened a wide range of uses, such as making it the protagonist of a device.

In addition to the movement amount detector, the invention of claim (2) adds a blade edge detector that transmits when a continuous swing blade of a conventional device passes a fixed point, and sends both signals to a synchronous control device. By measuring the difference between the cycles of both signals and issuing a command to adjust the speed of the piston or blade so that the difference disappears, the cycle in which the material is extruded by one quantitative material and the extruded material are cut The cycle of the turning blade is always kept equal, and the quantitative material measured one by one is cut out.

According to the invention of claim (3), the movement amount detector outputs a pre-signal immediately before transmitting the material extrusion for one quantitative material, thereby lowering the extrusion speed of the piston and continuing the movement amount detector. Since the blade is operated by a regular signal, less material is held by the blade at the material extrusion port, and the material cutting edge is clean.

[Brief description of drawings]

FIG. 1 is an explanatory view of an embodiment of the present invention, FIG. 2 is a front view of a blade thereof, FIGS. 3 and 4 are front views and side views of another embodiment of the blade, and FIG. FIG. 6 is an explanatory view of an embodiment of the invention in the range (2), and FIG.
Is an extrusion cylinder, 5 is a blade, 6a is a blade drive control unit, 7a is a piston drive control unit, 11 is a movement amount detector, 12 is a blade edge detector, and 13 and 13 'are synchronous control devices.

Claims (3)

[Claims] Claim: What is claimed is: 1. An apparatus for mass-producing a quantitative material by packing a rubber material in an extrusion cylinder, extruding the material to a required cross-sectional dimension by a piston, and cutting the material extruded one after another with a blade along an extrusion port. A probe that moves in synchronization with the pushing movement of the piston,
A movement amount detector that outputs an electric signal each time the movement amount of the probe reaches a length corresponding to the movement amount of a piston for extruding one quantitative material, Quantitative material cutting device. 2. The apparatus according to claim 1, further comprising:
When the continuous swivel blade or reciprocating blade that is the blade passes through the extrusion port front surface and other fixed points, a blade edge detector that outputs an electrical signal, receives the electrical signals of both the movement amount detector and the blade edge detector,
A quantitative material material cutting device for rubbers, comprising: a synchronous control device for instructing the drive control unit of the piston or the turning blade so as to eliminate the difference between the cycles of both signals. 3. The apparatus according to claim 1, wherein the cutting tool repeats a cutting operation in synchronization with an electric signal of the movement amount detector, and the cutting operation changes the pushing speed of the piston by a prior signal. A quantitative material cutting device for rubbers, which is characterized in that it is carried out while it is lowered.