JPH02107407A - Constant amount material cutting device for rubbers - Google Patents

Abstract

PURPOSE:To eliminate nervous feeling of worker at a site and to prevent mass production of improper products by providing a probe moving synchronously with the extruding movement of a piston, and a moving distance detector for outputting an electric signal each time the moving distance of the prove arrives at a length corresponding to the moving distance of the piston for extruding a material of amount corresponding to one of quantitative material. CONSTITUTION:A probe 10 horizontally moves in a shape for producing the movement of a piston 3 as it is, and the horizontal movement is measured by a moving distance detector 11 of a precision length measuring unit. The detector 11 generates an electric signal each time the end of the probe 10 moves along the detector 11 and the piston arrives at a length for extruding a material of amount corresponding to one of a quantitative material B. Accordingly, the moving distance of the piston 3 for extruding the material of the amount corresponding to one of the material B can be easily calculated from the ratio of the inner diameter of an extruding cylinder 1 to that of an extrusion port 2. That, is, the movement of the piston of the extruding cylinder of rubber materials is produced as the movement of the probe, and the detector oscillates by the probe each time the piston extrudes the material of amount corresponding to one of the quantitative material. Thus, the cutter for cutting the extruded material by the electric signal can started.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a quantitative material cutting device for rubber.

(Prior Art) When making a product by press-fitting rubber into a mold, the rubber material (blank) is required to completely fill the inside of the mold and have a volume that is not too large.

Conventional equipment for mass-producing such fixed-quantity materials includes: A, JP-A-54-21385 r Periodic cutting device for plastic extrudates B, JP-A-57-55563 r Extrusion equipment, C0 JP-A-60-46226 r ram extruder, etc.

A means "extruding a substance through a die at a constant volume ratio,"
This is a known device that repeatedly cuts the extruded material at the same time interval at the point where it exits the die, but the blade drive mechanism has been modified to shorten the time that the blade blocks the exit of the die during cutting. , B is a similar device, in particular with the addition of an extruder vacuum pump and a two-speed ram; C is a similar device with a mechanism for removing air from the material fed to the device.

<Problems to be Solved by the Invention> All conventional quantitative material manufacturing devices "extrude a substance through a die at a constant volume ratio...and repeatedly cut the extruded material at the same time interval", i.e. Extrude at a constant speed and cut at equal time intervals.

This method requires mass production of material with a turning volume, and there is no guarantee that the volume is appropriate.

If a field engineer makes a mistake in adjusting the extrusion speed or cutting time interval, he or she will produce a large number of defective products. Therefore, engineers and managers must constantly inspect mass-produced materials.

The purpose of this invention is to eliminate the above-mentioned stress on site personnel and the fear of mass production of defective products.

Means for Solving the Problems) (1) of the quantitative material cutting device for rubber of the present invention is to fill an extrusion cylinder with a rubber material, extrude it into a desired cross section with a piston, and cut the extruded material. , in a device that mass-produces a fixed amount of material by dividing it one after another with a cutter along the extrusion port, - a probe that moves in synchronization with the extrusion movement of the piston, and a transfer amount of the probe, which is The feature is that it is equipped with a movement amount detector that outputs an electric signal every time the piston reaches a length corresponding to the movement amount of the piston to extrude the same amount of material. When the continuous rotating blade or reciprocating blade that is the cutter passes the front surface of the extrusion port or other fixed point, the blade edge detector outputs an electric signal, and receives electric signals from both the travel amount detector and the blade edge detector.

and a synchronous control device that instructs the drive control unit of the piston or the rotating blade so as to eliminate the difference in the periods of both signals, and (3) also includes a synchronous control device that instructs the drive control unit of the piston or the rotating blade, and (3) is the device of (1), wherein the blade The cutting operation is repeated in synchronization with the electric signal from the travel amount detector, and the cutting operation is characterized in that the cutting operation is performed while the extrusion speed of the piston is reduced by a signal in front of the vehicle.

(Function) In the past, the extrusion speed and cutting time interval were first adjusted to obtain the required amount of material, and then the same speed and interval were maintained in principle, which was a blind mass production method. In this invention, the dimensions of each piece are checked and cut out.

In other words, this invention extracts the movement of the piston as it is or magnifies it as a probe movement, and calculates the amount of extrusion movement required for the piston to extrude one target amount of material (this is determined by calculation or experiment). When the probe moves by a certain amount (obtained), the corresponding amount of movement of the probe is determined, and each time the probe moves by that amount, the movement amount detector emits an electric signal (the extrusion cylinder is, of course, a right cylinder).

Between this electric signal and the next electric signal, the material will be extruded by one metered amount.

Therefore, if the extruded material is divided based on this measurement signal,
-You will be able to check the volume of each piece before cutting, freeing you from the anxiety of traditional blind work. This is the invention of claim (1).

The above electrical signals can be used as follows: (a) The signal starts the cutter to cut, and (b) the conventional method in which the cutter rotates continuously. (C) The present invention is added as a monitoring means to l, and the operator adjusts the machine so that the period of the electric signal of the movement amount detector and the actual cutting become the same.
Similarly, there are three main points: whether this invention is added to a conventional device, or it is not just a monitoring/monitoring means, but also has an automatic control device that keeps the cycle of the above-mentioned signal the same as the cycle of actual cutting. It is.

The invention of claim (2) belongs to the above usage (c).

In addition to the above-mentioned movement amount detector, when the continuously rotating or reciprocating blade passes the front of the extrusion port or other fixed point,
A blade edge detector that outputs a signal is added, and the signal from each detection base of each car is sent to the synchronous control device. Therefore, the periods of the two signals are compared, and the period control device instructs the drive control section of the piston or the rotating blade to speed up or slow down the driving until the two periods match, and synchronize the driving. As a result, after cutting - times, the revolving blade cuts the material at the moment the piston extrudes the next quantity of material, which is repeated, thereby achieving mass production of accurate quantities of material.

Furthermore, the invention of claim (3) is based on the above usages (a), (b) (
c) Applicable to both. Whether the blade is reciprocating or rotating, it goes without saying that the blade can be configured to cut in accordance with the signal from the movement amount detector.
Immediately before the knife starts cutting, it emits a signal,
This instructs the piston drive control section to reduce the extrusion speed. Since the cutting operation is performed while the temperature is decreasing,
The amount of material held back by the knife is reduced, resulting in a better cut and better cutting accuracy. Needless to say, the extrusion speed should be returned to the original speed.

(Embodiment) Fig. 1 is a detailed explanatory diagram of the present invention, in which l 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 drive unit, and 7 is a A fluid cylinder that reciprocates the piston 3, and the material A in the extrusion cylinder l.
, the cut off quantitative material is designated as 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 tube 8 having the same diameter as the cylinder 1 and having a probe guide groove 8a. Located between the guide cylinder 8 and the extrusion cylinder l.

There is a material feed opening 9 to the extrusion cylinder l.

In this embodiment, a probe support member le is attached to the piston rod 4.
The proximal end of a is fixed, and a probe IO is attached to its tip.

Therefore, the probe 1O moves horizontally to pick up 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 U, which is a precision length measuring device, and the detector 11 emits an electric signal every time the piston reaches a length that pushes out the amount of material B - quantified materials. It is.

The amount of movement of the piston 3 for extruding the material B-quantized material can be easily calculated from the ratio of the inner diameter of the extrusion cylinder l and the inner diameter of the extrusion port 2. Since this is usually in units of one layer, a precision length measuring device was used in this embodiment. However, if the amount of movement of the piston 3 is taken out through an enlarging mechanism, the movement of the probe IO will become large, so for example, a limit switch can be set. It is also possible to form the movement amount detector 11 by arranging them at intervals.

As mentioned earlier, how to use the electrical signal from the Shift9JJ#ik detector 11 is as follows: (a) Activate the knife;
(b) use as a monitoring means, and (C) synchronize the signal and disconnection by automatic control, etc., and the embodiment shown in FIG. 1 belongs to (a). In other words, the electric signal from 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 source 15) to start the stationary blade 5 and move it out of the extrusion port. A fixed amount of material A is cut off to obtain a fixed amount of material B.

There is a delay time between the signal to start the blade 5 which has been stationary and the actual cutting by the blade 5.

Therefore, in the embodiment shown in FIG. 1, the cutter 5 actually
A blade edge detector 12 is installed, which transmits a signal the moment the blade crosses the front of the blade.
The signal is sent to the cutting delay corrector 14 to store the necessary correction amount for the next cutting.

When the signal from the movement amount detector 11 enters the synchronous control device 13,
A signal is issued to synchronize the blade drive unit 6, which is a pneumatic cylinder, and the delay compensator 11 corrects the delay in the operation in the previous cutting, and sends the blade drive unit 6 to the drive control unit 6a to correct it each time. I'm trying to run it on a standard cycle. Note that the delay corrector 14 may be omitted.

To apply the invention of claim (3) to the embodiment shown in FIG.
Immediately before the signal that the movement amount detector 11 outputs when extruding the material for quantified material B, a preliminary signal is output by the same detector 11 or a separate detector, and the preliminary signal is As shown by the chain line in FIG. 1, it is sent to the drive control section 7a of the fluid pressure cylinder 7. Therefore, since the throttle valve in the control section 7a is throttled, when the movement of the piston 3 of the cylinder 7 becomes slow, the original signal from the movement amount detector 11 is output, and the blade 5 performs a cutting operation. Thereafter, the drive control section 7a is provided with a return means such as a timer so as to immediately return the throttle valve and return the piston 3 to its 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, and each is provided with a throttle valve and a solenoid valve to control the piston drive speed. It is possible to switch between three modes: fast, steady, and slow. Fast driving speed is achieved through the extrusion cylinder l from the material supply port 9.
Steady speed is used when extruding and cutting the material begins, and slow speed is used when the extrusion speed is reduced just before cutting.

Note that the method of reducing the extrusion speed of the piston 3 using a prior signal can be applied to both the reciprocating blade shown in FIG. 1 and the rotating blade shown in FIG. 5.

FIG. 2 shows a front view of the cutter 5 in FIG. 1. In this example, the cutter 5 must be quickly pulled up and put on standby. Since the piston 3 continues to be pushed, it is difficult to return the cutter 5. As a matter of urgency, it is best to point the cutting edge of the knife 5 upwards and downwards, as shown in Figure 3.4, so that cutting can be performed in both reciprocating motions.

- There is no need to return the cutter 5 every time.

The embodiment shown in FIG. 5 is similar to the conventional device, and is of the type in which the cutter 5 continuously rotates a plurality of radially protruding pieces to cut off the material five times in succession, and the invention of claim qA (2) is applied. ing.

In this case, a cutting edge detector 12 is installed at the tip of the downward extrusion cylinder 1 facing the path of the cutting tool 5, and a signal and a movement amount detector are installed at the moment when the cutting tool 5 passes the front surface of the extrusion port 2. 11 enters the synchronous controller 13'. This synchronous control device 13' measures the respective transmission cycles of both detectors 11 and 12, and adjusts the extrusion speed of the piston 3 and the continuous rotation speed of the cutter 5 to keep both periods equal. In this example, the simplest control method (7 omitted) is used to speed up the blade drive control unit 6a if the signal from the blade edge detector 12 is slow, and slow down the blade if it is too fast, so that both signals are transmitted simultaneously every time. .

Hereinafter, each invention and one embodiment have been explained, but of course,
The embodiments may be varied and adapted in many ways according to the well-known skills of mechanical designers.

(Effects of the Invention) The present invention is based on the conventional quantitative material cutting device, which does not have the function of measuring each quantitative material to be cut out, and relies mostly on machine adjustment by field engineers and sampling inspection after cutting. By addressing the current situation as a problem, we paved the way for the first time to mass produce quantitative materials by weighing each piece.

In other words, the invention of claim (1) uses the movement of the piston of the extrusion cylinder for rubber material as the movement of the probe, and each time the piston extrudes a constant f material - the amount of movement of the probe. Now that the detector is activated, the electric signal can be used to activate the blade that cuts the extruded material, or the movement of the rotating blade can be compared with the electric signal and used as a guide for manual speed adjustment. It has opened up a wide range of applications, such as being used as the main role in automated weighing equipment.

Furthermore, the invention of claim (2) adds, in addition to the above-mentioned movement amount detector, a cutting edge detector which sends a signal when the continuously rotating blade of the conventional device passes a fixed point, and sends both signals to a synchronous control device. The difference between the periods of both signals is measured, and a command is issued to increase or decrease the speed of the piston or blade so that the difference disappears, so the period at which the material is extruded by one fixed amount of material and the period at which the extruded material is cut are determined. The period of the rotating blade is always kept equal, and a measured amount of material is cut out one by one.

The invention according to claim (3) is configured to issue a preliminary signal immediately before the movement amount detector transmits the material extrusion for one fixed amount of material, thereby reducing the extrusion speed of the piston, and detecting the subsequent movement amount and the detector. Since the cutter is activated by a regular signal, less material is blocked by the cutter at the material extrusion port, resulting in a clean cut edge.

[Brief explanation of drawings]

Fig. 1 is a detailed explanatory diagram of the invention, Fig. 2 is a front view of the cutter, Figs. 3 and 4 are front and side views of other embodiments of the cutler, and Fig. 5 is the claims. A detailed explanatory diagram of the invention in (2), FIG. 6 is a bottom view of the vicinity of the cutter, and in the figure, l
is an extrusion cylinder. 5 is a blade, 6a is a blade drive control unit, 7a is a piston drive control unit, II is a movement amount detector, and 12 is a blade edge detector. 13 and 13'' are synchronous control devices.

Claims (3)

[Claims] (1) In a device that mass-produces a fixed amount of material by filling an extrusion cylinder with a rubber material and extruding it into a required cross-sectional dimension with a piston, and cutting the extruded material one after another with a knife along the extrusion port, the above-mentioned piston is used. a probe that moves in sync with the extrusion movement of the
A movement amount detector that outputs an electric signal every time the amount of movement of the probe reaches a length corresponding to the amount of movement of a piston that extrudes one quantified material. Quantitative material cutting device. (2) The device according to claim (1) further includes a blade edge detector that outputs an electric signal when the continuous rotating blade or the reciprocating blade, which is the blade, passes the front surface of the extrusion port or other fixed point; Receives electrical signals from both the travel amount detector and the blade edge detector,
A quantitative material cutting device for rubber, comprising: a synchronous control device for instructing a drive control section of the piston or the rotating blade so as to eliminate the difference in the periods of the respective signals. (3) In the device according to claim (1), the cutting tool repeats a cutting operation in synchronization with an electric signal from the travel amount detector, and the cutting operation is performed by adjusting the extrusion speed of the piston in accordance with a prior signal. A quantitative material cutting device for rubber, characterized in that cutting is performed while the material is being lowered.