JPH0431985B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a spare sheet feed timing adjustment device, which detects the trailing edge of a transfer sheet that is clamped by a clamp chain and sent to a sheet forming machine, and This has a field of application in which the timing of feeding is automatically adjusted so as not to generate an extra length that must be cut and discarded from the spare sheet to be fed.

(Prior Art) Conventionally, elongated sheets are fed out without considering whether or not an extra length will be generated that must be cut off at the leading edge of the elongated sheet.

(Problems to be solved by the invention) It is possible to use as many long sheets as possible with standard lengths such as 30 m, 50 m, 100 m, etc. for molding and to perform continuous molding that does not take time for replenishment. Although this is the long-cherished desire of sheet molding engineers, it has not been realized. On the other hand, the sheet lengths required for one shot of sheet forming are La, Lb, and
As shown in Lc... (La in Figure 1), it is necessary to change the sheet length to the optimum one depending on the dimensions of the mold used at that time. In addition, unsatisfactory molding surfaces occur near the front and rear edges of long sheets, and the length of the malformed portions on the trailing edge of the sheet is particularly limited because the length required for one shot is uncertain. Becomes indeterminate. However, when a new long sheet is fed to the starting end of the clamp chain after one long sheet has been attached, it is almost impossible to prevent forming defects from occurring at the front edge.

The present invention has focused on this, and is equipped with a transfer sheet sent by a clamp chain and a spare sheet that is then converted into a transfer sheet, to prevent molding defects from occurring at the trailing edge of the transfer sheet, After the transfer sheet is used up, the purpose is to control automatic switching to send out the front edge of the spare sheet without forming the defective part, so that the portion to be cut off is as small as possible.

(Means for Solving the Problems) The present invention is adapted to the object stated in the previous section, and includes an intermittent drive clamp chain for transporting sheets and a sheet forming machine that operates while the chain is stopped. In this apparatus, first and second sheet guides are provided, each of which has a front end directed toward the starting end of a clamp chain, each of which is provided with a sensor for detecting a front edge and a rear edge of a long sheet, and a first and second sheet guide is provided. , a transfer sheet is fed by a clamp chain through either one of the second sheet guides, and a spare sheet whose front edge is detected by a sensing sensor in either of the other sheet guides is provided, The drive of the pulse generator PG is commanded based on the detection signal from the edge sensing sensor, the remaining length of the sheet is measured until the clamp chain stops, and the measured value and the sheet length of one shot forming of the sheet forming machine are calculated. Compare and calculate the set value of
If (measured value > set value), the spare sheet is sent out the next time the clamp chain is driven, and if (measured value < set value), the spare sheet is sent out and converted into a transfer sheet when the clamp chain is driven the next time. The present invention relates to a method for adjusting the timing of sending out a spare sheet, which is characterized by the following.

A preferred embodiment of the invention will now be described.

(Example) Figure 1 shows a resin sheet molding apparatus 1.
An intermittent running clamp chain 2 that pierces and clamps both edges of the transfer sheet C ₁ by the pierced piece 3 on the upper running part, a heater device and a sheet forming machine are provided, and the clamp chain 2 is connected to a chain gear 4 at the starting end. Then, it is passed over the chain gear 5, etc. at the sheet sending end past the sheet forming machine.

At the starting end, a first sheet guide 6 and a second sheet guide 7, each with its front end directed toward the starting end, are arranged one above the other, and the front and rear edges of the long sheet are aligned with the sheet guide of the husband, etc. Detection sensors 8 and 9 are provided at the rear of each sheet guide 6 and 7, and a feeder is provided at the rear of each sheet guide 6 and 7 to rotate in synchronization with the running speed of the clamp chain 2 when the clamp chain 2 is running. rollers 10 and 13, and the roller 1
Pressure rollers 11 and 14 that come into contact with and separate from 0 and 13
will be established. Pressure rollers 11 and 14 are cylinder 1
Pivotally supported on rods 2 and 15, cylinders 12 and 15
A command to extend the rod is given to produce the above-mentioned pressure contact. At the starting end, a clamp forcing device 16 for piercing the transfer sheet through the pricking piece 3 is installed in an inclined arrangement so as to approach the clamp chain 2 sequentially in the running direction.

The transfer sheet C ₁ is fed into either the first sheet guide 6 or the second sheet guide 7, and the spare sheet C ₂ is fed into the other. The drawing shows a mode in which a transfer sheet C ₁ is sent to the first sheet guide 6 and a spare sheet C ₂ is sent to the second sheet guide 7. In the first sheet guide 6, the transfer sheet C 1 corresponds to the transfer sheet C ₁ . A feed roller 10 and a pressure roller 11 sandwich the sheet C ₁ , and the sheet C ₁ is clamped by a clamp chain 2 and is intermittently conveyed toward the sheet forming machine.

The front edge of the spare sheet C ₂ is detected by the sensor 9 of the second sheet guide 7 and stopped. The reason is that the sensing sensor 9 sends the pressure roller 14 to the feed roller 1 in response to a sensing signal that detects the front edge of the sheet.
This is because a command to separate from the cylinder 15 is given to the cylinder 15. Even if the roller 13 rotates at a circumferential speed that matches the speed of the clamp chain 2, it will not actually send the spare sheet _C2 , but a command to stop the rotation of the roller 13 is issued based on the above-mentioned sensing signal. is more reasonable.

A pulse generator consisting of an encoder on the shaft of the chain gear 4 or a driven shaft that rotates in conjunction with the shaft.
Establish a PG. This pulse generator PG is not driven all the time, but only when the sensing sensor 8 or 9 detects the trailing edge of the sheet.

(Action of the present invention) Even if the sheet length required for one shot molding by a sheet molding machine varies as shown in FIG. 2, each length is known, so the present invention is effective. The values of these known lengths are stored by the setting device 101.

On the other hand, the transfer sheet C ₁ is intermittently transferred in the direction of the sheet forming machine by the clamp chain 2 via the first sheet guide 6, and the sheet forming machine operates intermittently during the intermittent stoppage of the clamp chain 2 to Apply molding.

The conveyed sheet C ₁ gradually increases in length, and when the sensing sensor 8 senses its trailing edge, the pulse generator PG is commanded to drive based on the detection signal at that time.

The pulse generator PG stores the movement distance of the clamp chain 2 from when the drive is commanded until the clamp chain 2 stops intermittently by accumulating pulses.
If the number of accumulated pulses is _small , the insufficient length W ₁ of the transfer sheet C ₁ is detected as shown in FIG. Find the length W ₂ .
On the other hand, the spare sheet C ₂ is the transfer sheet as described above.
When the rear edge of C ₁ is detected, it is sent out so that it is clamped by the clamp chain 2, and a slight excess length W ₃ is provided at the front edge of the chain so that it can be used for mold clamping by a sheet molding machine, etc. When length W ₂ is detected, if the sheet is sent to clamp chain 2 the next time it is driven, W ₂ and W ₃ at the sheet edge will overlap, resulting in defective molding. .

In order to avoid such inconvenience, the method of the present invention compares and calculates the numerical value calculated by the pulse generator PG and the set numerical value using the arithmetic unit 102 as shown in the flow sheet of FIG. Either numeric value) or (measured numeric value < set numeric value) is input into the determination device 103. On the other hand, a spare sheet
The surplus length W ₃ of C ₂ is stored as a numerical value in the determination device 103, and the selection device 104 determines whether the roller 13 and the pressure roller 14 are different from each other based on, for example, a sensing signal of the leading edge of the spare sheet C ₂ from the sensing sensor 8. has already been selected, and when this selection is made, the drive of the roller 13 and the pressing of the pressure roller 14 to the roller 13 are commanded, and the rotation of the roller 13 increases the above-mentioned surplus length W ₃ of the preliminary sheet C ₂ . Sending is done. On the other hand, when the calculation signal of "measurement value small" is inputted to the determination device 103, the rotation of the roller 13 interlocked with the clamp chain 2 and the roller 1 of the pressure roller 14 occur when the clamp chain 2 is driven next time.
3 is commanded to continue pressure welding, the spare sheet C ₂ is sent out, and when a calculation signal of "large measurement value" is input, when the clamp chain 2 is driven one after another,
The rotation of the roller 13 in conjunction with the clamp chain 2 and the continuous pressure contact of the pressure roller 4 are commanded.

(Effects of the present invention) Since the present invention uses a configuration in which the first sheet guide 6 and the second sheet guide 7 are provided with the starting end of the clamp chain 2 oriented, the conveyance transported by the clamp chain 2 is It is possible to use a spare sheet that is kept on standby without being moved with the sheet, and when the length of the transfer sheet is exhausted, it can be converted to the transfer sheet of the spare sheet, so the operation of the clamp chain 2, molding equipment, etc. can be stopped. Continuous work can be continued without stopping the work (the spare sheet is sent in when either the first or second sheet guide is open). In addition, when the length of the conveyed sheet runs out, the trailing edge is detected, the length from when the length is detected until the clamp chain stops intermittently is detected by a pulse generator, and the detected value is sent to one shot of the sheet forming equipment. The sheet length is compared with the sheet length setting device used in Since the sheet is fixed, there is no occurrence of defective molding that would have to be cut off due to poor molding on the front edge of the sheet converted from the preliminary sheet to the transfer sheet, thereby having the effect of maximizing the usable length of the sheet.

[Brief explanation of drawings]

The attached drawings are for explaining embodiments of the present invention, in which Figure 1 is a side view of an apparatus adapted to the method of the present invention, and Figure 2 is a line showing variations in the amount of sheets used in one shot molding. 3 is a plan view showing the rear end of the transfer sheet C ₁ and the front end of the spare sheet C ₂ ,
Figure 4 is a flow sheet.

Claims (1)

[Scope of Claims] 1. In an apparatus comprising an intermittent drive clamp chain for transporting sheets and a sheet forming machine that operates while the chain is stopped, the front end of each is directed toward the starting end of the clamp chain. 1. A second sheet guide is provided, each of which is provided with a sensor for detecting the leading edge and trailing edge of the long sheet, and the conveyance is carried by a clamp chain through either the first or second sheet guiding. The sheet and a spare sheet that is stopped when its leading edge is detected by a sensing sensor in one of the other sheet guides are provided, and a pulse generator PG is commanded to be driven by a detection signal from the sensing sensor of the trailing edge of the conveyed sheet. Then, measure the remaining length of the sheet until the clamp chain stops, compare the measured value with the set value of the sheet length for one shot forming of the sheet forming machine, and calculate (measured value > set value). If so, feed out the spare sheet the next time you drive the clamp chain,
If (measured value < set value), the spare sheet is fed out and converted into a transfer sheet when the clamp chain is driven one after another.