JPS5953198A - Method of cutting excessive rubber tube in rubber tube braiding work - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the braiding of tubes used, for example, as brake hoses, and in particular to a method for cutting extra length of rubber tube in a rubber tube braiding operation in which a mandrel is inserted.

Generally, high-pressure rubber hoses are manufactured by inserting a mandrel and forming a braided layer on the rubber tube, but there are many factors that contribute to variations in the elongation (excess length) of the rubber tube during braiding. Even if the length of the tube is made constant before work, the variation in the length becomes very large when the tube is braided. Therefore, in that IT, the braid is also blankly cast in the extra length rubber tube part that extends outside the mandrel, resulting in a so-called blank braiding part, and the braiding rubber tube into which the braiding mandrel is inserted is continuous one after another. If the blanks are sent in a fixed manner, a large amount of wasted blank parts will be generated as a whole, which will be very uneconomical.

For this reason, there are two methods: one method is to roughly cut off the extra length based on human intuition while looking at the work status of the day, the other method is to stop the braiding machine after each braid is completed and cut and remove the excess tube.
The work of cutting and removing the excess tube is carried out by using a computing device such as a microcomputer or a minicomputer to predict the final tube elongation and cutting the tube.

However, in the above two methods, the number of machines that can be used is limited because the operator has to monitor each braid, and automatic feeding of material before braiding is not possible.

Still, it is possible to reduce the amount of empty firing by using a calculation device, but it is not a convincing thing to say, and it may be possible to calculate with a microcomputer or minicomputer.
Requires expensive capital investment.

However, when we considered the causes of excess rubber tube length during braiding work, we found that the main causes are the material of the rubber tube (including the lot), the wall thickness of the rubber tube, and the As shown in the figure, the head guide 2' of the braiding machine 1' heats the rubber tube 4' due to contact wear during braiding with the braided thread 3', and the tension of the braided thread increases. It is assumed that any one of them influences the elongation (extra length) of the rubber tube 4', thereby causing the extra length of the rubber tube to vary.

If we look at the extra length rubber tube cutting device 119i which is generally used for each of the braiding operations mentioned above, although not shown, a guide is formed in front of the cutting device to receive the cut extra length rubber tube. There is. This guide is
Since the tube is made up of a shaped pipe, depending on the length of the one-child thigh tube that falls naturally after the extra length of the tube is cut, the tube may become entangled with the guide and not fall. Entanglement adversely affects the braiding operation of rubber tubes that are automatically supplied with pre-braided rubber tubes.

This invention overcomes the above-mentioned drawbacks of the prior art by providing a method for cutting extra-length rubber tubes that enables economical braiding work and increases the number of machines that can be held by minimizing the blank section using economical equipment. The gist of this is that in hose braiding work that continuously braids rubber tubes on a mandrel, a cutting machine located in front of the first braiding machine is located in front of the first braiding machine. Moreover, there is a method for cutting an extra length of rubber tube in a rubber tube braiding operation which is operated by an electric signal from a mandrel rear end detector for detecting the rear end of the mandrel.

Hereinafter, an embodiment of the method for cutting an extra length rubber tube of the present invention will be explained with reference to the drawings.
1 is a raw rubber tube for braiding into which a man Prel 2 is inserted; 3 and 4 are braiding machines for forming braided layers 5 and 6 on this tube 1; 8 is a cutting machine placed in front of the braided material 3, specifically, as shown in the front view of FIG. 3 and the side view of FIG. 4, it mainly has two cutting blades 9 and 10; A rack 11.12 formed integrally with the cutting blades 9, 10 and a rack 11.1 thereof.
2, a pinion 13 moves the racks 11 and 12 in opposite directions, and the rack 11 (
Cylinder mechanism 14 that functions to move 12)
The cutting blade 9 has a semicircular blade part 91 that matches the inner diameter of the rubber tube 2, and the semicircular blade part 9.
5 having a parallel blade part 92 having a diameter width of 1 and an appropriate length, and a widening part 93 expanding outward from the parallel blade part 92.
- Consists of the structure, in this case the sliding table 94? It is fixed vertically by bolts etc. Furthermore, the sliding table 94 is configured to be slidable in a sliding groove 151 formed in the support body 15. For a rack 11 having an appropriate length, a sliding table 9 is used.
It has a structure that is fixed to the bottom surface of 4 and is fixed downward. The cutting blade 10 has a semicircular blade part 101 having the same shape as the cutting blade 9, a parallel blade part 102, and a widening part 103, but in this case, the cutting blade 9 and the cutting blade 9 are attached to an L-shaped member 104. The L-shaped member 104 is fixed vertically facing each other, and the L-shaped member 104 is further connected to another L-shaped member 105.
It is located below the rack 11 and connected to the rack 12 which is disposed upward via the rack 11 and 106. In addition, even though a sliding table 107 is fixed to the bottom of the rack 12, the sliding table 107 can slide on a sliding groove 161 formed in the pace 16. The rotatable pinion 13 is disposed between the racks 11 and 12 so as to mesh with them at the same time, and has the function of bringing the cutting blades 9 and 10 closer to each other (crossing each other) or away from each other by its rotation. It is supposed to be done. In this case, the cylinder mechanism 14 fixed to the auxiliary support plate 17 is connected to one end surface 1+11 of the rack 12. Therefore, when the cylinder mechanism 14 receives an operation start signal, the piston 141 operates in the direction of the arrow. For example, the cutting blades 9 and 10 cross each other.

18 is a stone 9- for adjusting the amount of movement of the sliding table 107.

Returning to the explanation of FIG. 2, reference numeral 19 is arranged in front of the mandrel 1 with the tube 2 attached to the cutting machine 8 in order to accurately guide it to the cutting machine 8. As shown in the front view of FIG. 5 and the right side view of FIG. It has a structure in which the lower circumferential surface has a completely chipped portion 20 along. 21
2 is a feeding device consisting of a roller for feeding the tube 1 (and mandrel 2) in the direction of the braiding machine 3;
Reference numeral 2 denotes a mandrel rear end detector disposed between the discharge guide t'1c+ and the feeding device 217-. Although not shown in this case, it is of a contact type, that is, when the tube 1 and the mandrel 2 are being fed. The upper end contactor is in contact with these 1 and 2, and when the mandrel 2 passes, the upper end contactor is electrically closed with the lower end contactor,
Furthermore, when the opening is closed, the cutting machine 8 is electrically connected so as to be operated by the electrical signal. 23 is cutting machine 8
and the mandrel rear end detector 21, and when the rear end of the mandrel 2 is detected by this detector 23, an electrical signal from the detector 23 is generated. 11 of the sending device 21! The mandrel into which the next tube placed at I is fitted is prepared by the delivery device 21. 24 is a detector 22 or 23 arranged between the braiding machine 3 and the cutting machine 8.
A detector 24 is used to detect the rear end of the mandrel similar to the above, and when this detector 24 is activated, the feeding speed of the feeding device 21 is changed, for example, by an electrical signal from the detector 24. Then, the tip of the next mandrel-containing tube that was waiting at the delivery device 21 for braiding is quickly fed to the position of this detector 24. 25 is each detector 22.2
3 or 24, and transmits the signal to each device, such as the cutting machine 8 and the sending device 21, so that the cutting machine 8, the detector 22, and the two 24 and the delivery device 21 electrically. 26 is the braided tube 1
It is a collection machine that collects

Next, if you try to cut the extra length of rubber tube in rubber tube braiding work using the device constructed as described above,
For example, when braiding a tube with a wall thickness that is used as the inner layer of a brake hose, the material of the rubber tube, the wall thickness of the rubber tube, the tension of the braiding thread, the atmospheric temperature near the braiding machine, or the braiding machine The elongation of the rubber tube during braiding differs depending on the influence of the temperature generated in the Heradugai P2', but based on many experiences that take into account the factors that affect the elongation of the rubber, it is approximately 1.59-m. It was determined that a mandrel with a length of approximately 3.5 m is required to form a fully braided layer on the tube.

First, first, create raw rubber tubes 1 and 10.5 with a length of 4 m that satisfy the relationship. ? Prepare + mandrel 2. Next, in order to determine the positions of the cutting machine 8 for cutting the excess length of the tube and the mandrel detector 22, the single mandrel two-man tube 1 is sent out by the feeding device 21, and the braiding machine 3 and the mandrel detector 22 are fed out. 4, and when the rear end of the mandrel 2 is 3.5 m from the braiding machine 3, a mandrel rear end detector 22 is set at the rear end portion of the mandrel 2. In this case, it goes without saying that when the setting position of the mandrel rear end detector 22 is set as described above, the cutting machine 8 is automatically set at a position 1.5 m behind the braided material 3. In this case, at these set positions, the cutting machine 8 is too close to the braid @ 3, which affects the braiding work, so in reality, the cutter 8 is about 1.5 mm away from the braid @ 3.
The cutting machine 8 and the detector 22 are each moved to a position shifted by m and set and fixed. In other words, the cutting machine 8 is the braiding machine 3.
The mandrel rear end detector 22 is set and fixed at a distance of 5 m from the braiding machine 3.

In this way, the cutting machine 8 and the mandrel rear end detector 22
If the position of the mandrel 2 is fixed, the second mandrel-filled tube 1 is sent out by the feeding device 21 and braided by the braiding machine 3, and when the rear end of the mandrel 2 is detected by the mandrel rear end detector 22, The electrical signal from the detector 22 activates the cutting machine 8 via the control device 25. Therefore, the cutting machine 8 is activated, and the rubber tube 1 is stretched to cut only the portion expected to be the extra length (extra length tube). Next, when the rear end of the mandrel advances further and is detected by the detector 23, a cross-feeding device (not shown) carrying the tube containing the mandrel is actuated by the control device 25, and the next end is transferred to the feeding device 21 consisting of a pair of rollers. A tube containing a mandrel for braiding is set. If the mandrel rear end of the two-mandrel tube 1 shown in FIG.
5, the feeding device 21 is activated, and the mandrel-containing tube for the next braiding set in the feeding device 21 is quickly fed to the position where its tip is at the detector 24. One step of is completed. In this case, if the elongation of the second or third piece is larger (or smaller) than when the cutting machine 8 or mandrel rear end detector 22 is set on the first piece.
Needless to say, the cutting machine 8 and the detector 22 can be moved to freely adjust the distance between them by eight circles.

In this example, the mandrel 2 is 10.5 m long and the tube 1 is 4 m long, but if you use a mandrel that is approximately 2.3 times the length of the tube, the braiding effect will almost certainly be achieved. it is conceivable that.

In Fig. 2, the extra length of tube cut by the cutting machine 8 falls when the mandrel is completely passed behind the cutting machine 8, but in this case, the extra length tube is cut by the cutting machine 8.
Since the tube 19 falls more smoothly than the chipped portion 20, there is no need to worry about the extra length tube getting stuck in the guide as in the conventional case.

As described above, according to the present invention, the extra length of the tube is cut by detecting the rear end of the mandrel and activating the cutting machine, which is a cheaper method than the conventional cutting method. Its industrial value lies in the fact that it is possible to do so, and also to be unmanned.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the main part of the prior art, FIG. 2 is an explanatory diagram showing an embodiment of the present invention, and FIGS. 3, 4, 5, and 6 are the main parts of the invention. FIG. 1.4'...Rubber tube, 1', 3.4.
...Braiding machine, 2...Mandrel, 2'...
... Het kite, 31 ... Braided thread, 5,6.
... Braided layer, 8 ... Cutting machine, 9.10.
...cutting blade, 11.12 ... rack, 13
...... Binion, 14... Cylinder mechanism, 141... Piston, 91, 101...
...Semicircular prong, 92°102...Parallel blade part,
93,103... widening part, 94.107...
...Sliding stand, 104, 105, 10613- ...L-shaped member, 15 ... Support stand, 15
1,161...Sliding groove, 16...Pace, 17...Auxiliary support part, 18...Stock horn ξ-119...Discharge Guy P120...
... Chipped part, 21 ... Feeding device, 22゜23.24 ... Mandrel rear end detector, 25.
...5th [21 -611- Seri 6 figure

Claims (1)

[Claims] 1. In a hose braiding operation in which continuous braiding is performed on the outer circumference of a tube on a mandrel, a cutting machine located in front of the first braiding machine is placed in front of the cutting machine and the rear end of the mandrel is A method for cutting an extra length of rubber tube in a rubber tube braiding operation, characterized in that the extra length of the rubber tube is cut by being actuated by an electric signal from a mandrel rear end detector.