JPH0225441B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a length measuring and cutting device for O-ring strips used in large-diameter sealing parts.

"Prior Art" Conventionally, O-rings have been widely used as sealing means, and those with small diameters are formed into endless shapes. For large machines with large ring diameters, rubber strips are cut to the length of the O-ring groove and the ends are glued together.

There are two methods for cutting such rubber strips and processing them into O-rings. One method involves fitting a rubber strip into an O-ring groove, cutting the ends together, and gluing the ends together. With this method, it is difficult for one person to work unless the work area is level, and when inserting the rubber strip into the O-ring groove,
O if it cannot be fitted properly due to expansion or contraction.
Even if the cross section of the ring shrinks or expands, it is often not obvious. The other method is to cut a rubber strip in advance to a length equal to the diameter of the O-ring groove multiplied by the circumference and the correction factor, fit it into the O-ring groove, and bond the ends of the rubber strip together.

When using this method, it is first necessary to measure the length of the rubber strip. This measurement involves placing a rubber strip in a straight line on the factory floor and measuring its length using a scale.
In this method, a rubber strip is fitted into the O-ring groove of a machine and the end portion is glued.If the rubber strip is fitted into the O-ring groove without stretching or shrinking, the O-ring can be formed accurately. However, for example, if the ring diameter is 5 meters, the rubber strip will exceed 15 meters. Such a long space must be provided, and since the rubber strips are placed on the floor, they become dirty with dirt, so cleaning them is also a chore. Furthermore, it may not be possible to measure rubber strips by one person.

A conventional example of measuring the length of a long object is the Tokkosho
There is an invention disclosed in Publication No. 53-31613. In this conventional invention, a long object such as cloth, paper, wire, etc. is held between a measuring roller and a pressing roller that is pressed toward the measuring roller by a spring force, and the end of the long object is held by a positioning lever. The long object is moved by being pulled in one direction, and the length of the long object is measured by a measuring device that works in conjunction with a measuring roller. This avoids placing a long object in a straight line on the floor and measuring its length, and the above problem is solved.

"Problems to be Solved by the Invention" Since the length measuring roller and the pressing roller in the conventional example described above are cylindrical rollers and are supported by parallel shafts,
If we measure the length of the O-ring strip, (1) When the O-ring strip is pulled, it can move even if it is tilted with respect to the direction of movement of the outer periphery of the measuring roller. Since the moving length of the O-ring strip and the moving length of the outer periphery of the measuring roller do not match, the measurement error is large.

(2) Since the measuring roller has a cylindrical outer circumference, O
There is a risk of slipping between the ring strip and the ring material, leading to measurement errors. This slippage can be reduced by increasing the spring force that applies the pressing force of the pressure roller, but this will deform the cross section of the O-ring strip and cause the O-ring strip to pass between the measuring roller and the pressure roller. Since the length of and the circumferential movement length of the measuring roller are different, a measurement error occurs.

(3) Since it is not equipped with a cutting device, it is possible to measure but not cut, and it is necessary to insert a marking line in line with the positioning lever and cut it separately.

The present invention solves the above problems regarding measurement cutting of O-ring strips used for manufacturing large-diameter O-rings, and
It is an object of the present invention to provide a method for measuring, cutting, and locating an O-ring strip in which the length of the ring strip can be accurately measured and cutting can be performed at the same time.

"Means for Solving the Problems" The present invention includes a pair of measurement pulleys that rotates in accordance with the movement of an O-ring strip held between the outer periphery, and at least one pulley of the pair of measurement pulleys. A measuring and cutting device for O-ring strips, which is equipped with a device for detecting the circumferential movement length of a pulley by rotation of the pulley, includes a drum, a pair of guide rollers, a guide bush, the pair of measuring pulleys, and a cutting device. each of these members is arranged so that the O-ring strips extend in a straight line, and the drum is rotatably supported so that the O-ring strips are wound and drawn out; The guide roller pair is a groove wheel that prevents the O-ring strip from sagging and shaking, the guide bush has a guide hole through which the O-ring strip is inserted, and the measuring pulley pair has an interaxial distance adjusting device. The pulley is equipped with a device for detecting the length of movement of the pulley in the circumferential direction by rotation, and the pulley is provided with a concave groove in the circumferential direction of the outer periphery into which an O-ring strip is fitted, and the cutting device is provided with a groove for fitting an O-ring strip. It has a cutting whetstone fixed to a grindstone shaft parallel to the extending direction of the strip, and the grindstone surface of the cutting whetstone is guided and supported to be able to move in and out of the cutting position of the O-ring strip, and the O-ring strip is The device has an openable and closable presser foot that presses and fixes the O-ring strip at the cutting location, and the device detects the circumferential movement length of the measuring pulley. This is a length measuring and cutting device for O-ring strips that displays the moving length.

"Embodiments" Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view. A rubber strip 1, which is a strip material for an O-ring used for manufacturing an O-ring, is wound around a drum 3 rotatably attached to a shaft 2. drum 3
A guide bush 4 is fixedly disposed at a position where the rubber strip 1 is pulled out in the cutting line direction. A pair of rotatable grooved rollers 9 are provided between the drum 3 and the guide bush 4 to prevent the rubber strip 1 from sagging and wobbling. The guide bush 4 has a guide hole 7 into which the rubber strip 1 is inserted on the cutting line where the rubber strip is held between the guide pulley 5 and the measuring pulley 6. The guide hole 7 has a large floppy shape on the entrance side 8 . The diameter of the guide hole 7 is such that the largest rubber strip 1 processed by the apparatus of the present invention can pass therethrough.

FIG. 2 is a sectional view taken along the line AA in FIG. 1. The guide pulley 5 is fixed to a shaft 13 that is rotatably supported by a bearing 12 that fits into a fixed bearing house 11. A measuring pulley 6 is arranged so that the guide pulley 5 and the outer periphery thereof can roll via the rubber strip 1. The guide pulley 5 and the measuring pulley 6 are both coated with a material that can hold the rubber strip 1 and has a large friction with the rubber strip 1, such as rubber, and both pulleys 5 and 6 have concave grooves in the circumferential direction. ing. The measurement pulley 6 is fixed to the measurement shaft 14. Measuring axis 14
In order to be able to move so that the distance between the guide pulley 5 and the measuring pulley 6 changes, an inter-axis distance adjusting device is provided. That is, the guide member 1
5, 16 and is movable toward the guide pulley 5.
The measurement shaft 14 is supported so as to be rotatable and movable in a direction perpendicular to the measurement shaft 14 . The gear 19 fixed to the measuring shaft 14 is the gear 2 at the end of the input shaft of the digital counter 20 fixed to the bearing bracket 17.
1 is interlocked. As shown in FIG. 1, a feed screw 22 is screwed into an internal thread cut in the bearing bracket 17 parallel to the guide members 15 and 16.
A journal portion at the base of the feed screw 22 is rotatably fitted into a fixed bearing 23, and a handle 24 is fixed to the end of the feed screw 22. Note that the bearing bracket 17 is fixed, the bearing house 11 is movable, the measuring pulley 6 is in a fixed position, and the measuring pulley 6 is
There is no problem even if the guide pulley 5 is moved relative to the position.

As shown on the right side of FIG. 1, a cutting device 10 for the rubber strip 1 is provided on the cutting line between the guide pulley 5 and the measurement pulley 6.

FIG. 3 is a sectional view taken along line BB in FIG. 1. An air motor 27 of an air grinder is fixed to the end of a swing arm 26 pivotally connected to a fixed shaft 25, and a cutting tool suitable for cutting rubber, such as a cutting wheel 28, is fixed to the output shaft end of the air motor 27. ing. That is, the output shaft of the air motor 27 is a grindstone shaft, and the grindstone shaft is parallel to the extending direction of the rubber strip 1. The swinging arm 26 is extended upward and has a handle 29.
Equipped with. One end of a tension spring 30 is engaged with the swing arm 26, and the other end of the tension spring 30 is engaged with a fixed portion.

A presser foot 33 pivotally connected to a shaft 32 fixed to a fixed bracket 31 has a bolt groove 34 at its swinging end, and a hinge bolt 36 pivotally connected to the fixed part by a pin 35 moves in and out of the bolt groove 34. A wing nut 37 is screwed onto the hinge bolt 36 to press the presser foot 33. The rubber strip 1 is pressed and fixed between the presser foot 33 and the immovable support 38. Presser foot 33, abutment 38
The cutter groove 39 is provided with a short distance from the side surface of the cutting wheel 28 into which the cutting wheel 28 can enter. In the above description, the machine frame (not shown) of this device is suitable as the fixed part.

The operation of this invention will now be described. The rubber strip 1 pulled out from the drum 3 is inserted through the guide hole 7 from the entrance 8 of the guide bush 4. When the handle 24 is rotated, the bearing bracket 17 moves back and forth with respect to the guide pulley 5, so that the bearing 18 and the measuring shaft 1
4. The measuring pulley 6, digital counter 20, etc. make the same displacement at the same time. Then, turn the handle 24 to move the measuring pulley 6 away from the guide pulley 5, pull out the rubber strip 1 peeking out from the guide bushing 4 between the guide pulley 5 and the measuring pulley 6, loosen the wing nut 37, and tighten the hinge bolt. 36
3 clockwise around the pin 35 to remove it from the bolt groove 34, rotate the presser foot 33 upward in advance, and insert the end of the rubber strip 1 into the guide pulley 5 of the cutter groove 39. , press the reset button of the digital counter 20 to set the instruction of the digital counter 20 to 0.

Next, the handle 24 is rotated to move the measurement pulley 6 toward the guide pulley 5 and press the rubber strip 1. The rubber strip 1 is held down by a scale 16a corresponding to the diameter of the rubber strip 1 cut on the guide member 16 and a 0 scale 17a on the bearing bracket 17, so that the amount of compression of the rubber is small depending on the diameter of the rubber strip 1. Apply appropriate pressure to prevent slippage. In this way, the length of the O-ring groove multiplied by the annular diameter and the circumference is calculated, and when the rubber strip 1 is pulled to the right in FIG.
In the figure, the rubber strip 1 moves to the right and rotates the guide pulley 5 and measurement pulley 6 held therebetween.
The measuring shaft 14 of the measuring pulley 6 rotates, and the gear 1
9 and 21, the digital counter 20 is driven and displays the circumferential length of the displacement of the measuring pulley 6, so that the length of movement of the rubber strip 1 can be determined. Therefore, the previously calculated length of the rubber strip 1 is checked using the digital counter 20, and the movement of the rubber strip 1 is stopped.

Thus, the rubber strip 1 is held down by the presser foot 33, the hinge bolt 36 is rotated into the bolt groove 34 of the presser foot 33, and the wing nut 37 is screwed in, the rubber strip 1 is fixed, and the air motor 27 is driven. Cutting wheel 2
8 and holding the handle 29 in your hand, the swinging arm 26 is rotated in the timing direction about the pin 25 against the spring 30 as shown in FIG.
enters the cutter groove 39 and cuts the rubber strip 1.
Then, the handle 29 is rotated counterclockwise to stop the air motor 27. Loosen the wing nut 37, remove the hinge bolt 36 from the bolt groove 34 of the presser foot 33, and lift the presser foot 33. In this way, a rubber strip 1 of the required length is obtained. The next rubber strip 1 can be obtained in the same manner.

In the above, the measuring pulley is connected to the digital counter via a pair of gears on its measuring shaft, but it may also be directly connected, and it is sufficient if the amount of circumferential displacement due to the rubber strip of the measuring pulley can be measured. A rubber roller may be fixed to the input shaft of the input shaft, and the rubber roller may be brought into pressure contact with a measuring pulley and rotated by friction. Alternatively, a rotating disk is provided so that the speed can be increased from the measurement pulley, and a black and white circumferential scale that reflects light is provided on the rotating disk, and the scale is read by a photocoupler using the reflected light and displayed via a detection device. It may also be displayed digitally on the device. In a simple case, a circumferential scale may be provided directly on the measuring pulley.

In the embodiment, an O-ring strip material such as a rubber strip is held between a guide pulley and a measuring pulley, and by moving the rubber strip, the measuring pulley is driven to rotate.The rotation of the measuring pulley is detected and the measuring pulley is rotated. Since the device is equipped with a means for measuring the displacement of the circumference of the object, the required length can be determined simply by pulling the object to be measured by hand and looking at the display on the measuring device. The rubber strip is wrapped around a drum, and after passing through the guide pulley and measurement pulley, it can be wound up again after passing the measurement reference point, so it takes up less space.
Measurement work can be carried out in small spaces without any problems.
It consists of a measuring pulley and a guide pulley to properly tighten the O-ring, and by pulling the rubber strip inserted between both pulleys by hand, the friction force of the rubber strip inserted between the pulleys can be measured. The mechanism is such that the pulley rotates and measures the length. But O
Since the ring has tolerances in the radial direction, the tightness changes gradually, and when measuring a given length, there is slippage, which reduces accuracy. As a result of pasting the O-ring and confirming the appropriate tightening allowance through experiments, the above drawbacks were improved by determining the tightening allowance for each O-ring size, and when actually installed, it was found that the conventional method of extending it above the floor and measuring with a scale It has become clear that the length of the rubber strip is determined by the same degree as . Since the guide bushing is provided between the drum around which the rubber strip is wound, the guide pulley, and the measuring pulley to sandwich the rubber strip, the rubber strip that is pulled out does not come off from between the guide pulley and the measuring pulley. Since a cutting wheel is provided at the measurement reference position, it is possible to accurately cut the rubber strip at the same time as measuring it. Since the rubber strip is cut with a cutting grindstone, the grinding force is small and deformation of the rubber strip is small.The rubber strip ends are cut at right angles to the longitudinal direction, and when the rubber strip ends are butted together, they come into close contact.

〔Effect of the invention〕

As explained above, (1) the drum, the pair of guide rollers, the guide bush, the pair of measuring pulleys, and the cutting device are arranged in a straight line, and each of these devices resists the moving O-ring strip. is made small so that there is almost no deformation of the cross section, so the O-ring strip does not tilt with respect to the measurement pulley, but the O-ring strip tilts in the direction of movement, and the cross-section of the O-ring strip is reduced. No measurement errors occur due to (2) Since the guide roller pair and guide bushing are located between the drum and the measuring roller pair, the O-ring strip does not sag and does not come off the measuring pulley pair. (3) The pulley, which is equipped with a device that detects the length of movement in the circumferential direction of the pulley by the rotation of the measurement pulley pair, has a groove in the circumferential direction on the outer periphery into which the O-ring strip material fits. , it is difficult for slippage to occur between the O-pulley and the strip for the ring, and since the pair of length measurement pulleys is equipped with a center distance adjustment device, it can be adjusted to the thickness of the strip for the O-ring. The O-ring strip can be pressed against the measuring pulley to obtain an appropriate frictional force, reducing the amount of deformation of the O-ring strip while preventing slippage between the measuring pulley and the O-ring strip. can be eliminated. (4) The device equipped with a cutting whetstone and detecting the moving length of the measurement pulley in the circumferential direction displays the moving length of the O-ring strip based on the cutting whetstone position, so it can be cut immediately at the same time as measurement. It cuts accurately and has good workability.

Since the cutting is performed using a cutting wheel, even if the O-ring strip is made of rubber, the cutting resistance is small and the area around the cut is not deformed, so the cut is accurate and the O-ring strip can be cut in an annular shape. Both ends are in uniform contact in the radial plane.

[Brief explanation of drawings]

FIG. 1 is a plan view of an embodiment of the invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG. 3 is a cross-sectional view taken along line B-B in FIG.
FIG. 1...Rubber strip, 2...Shaft, 3...Drum, 4...Guide bush, 5...Guide pulley, 6...Measuring pulley, 7...Guide hole, 8...Inlet side, 9...Roller, 1
0... Cutting device, 11... Bearing house, 12... Bearing,
13... Axis, 14... Measurement axis, 15, 16... Guide member, 17... Bearing bracket, 18... Bearing, 19...
Gear, 20... Digital counter, 21... Gear,
22...Feed screw, 23...Bearing, 24...Handle,
25... shaft, 26... rocking arm, 27... air motor, 28... cutting grindstone, 29... handle, 30... tension spring, 31... bracket, 32... shaft, 33... presser foot, 34... bolt groove, 35... pin , 36... Hinge bolt, 37... Wing nut, 38... Abutment, 39... Cut groove.

Claims (1)

[Claims] 1. Equipped with a pair of measurement pulleys that rotate in accordance with the movement of the O-ring strip material held between the outer periphery,
In the O-ring strip measuring and cutting apparatus, the apparatus includes a device for detecting the circumferential movement length of the pulley by rotation of the pulley on at least one of the pair of measuring pulleys. , the measuring pulley pair, and a cutting device, each of these members is arranged so that the O-ring strip extends in a straight line, and the O-ring strip is wound around the drum. The pair of guide rollers are rotatably supported so that
The groove wheel prevents the ring material from sagging and shaking, the guide bush has a guide hole through which the O-ring material is inserted, and the measurement pulley pair is equipped with an interaxial distance adjusting device, and the pulley is rotated by rotation. The pulley is equipped with a device for detecting the length of movement in the circumferential direction of the pulley, and the pulley is provided with a concave groove in the circumferential direction of the outer periphery into which the O-ring strip is fitted, and the cutting device is configured to detect the length of movement in the circumferential direction of the O-ring strip. It has a cutting wheel fixed to a grinding wheel shaft parallel to the
The grinding wheel surface of the cutting wheel is guided and supported so that it can move in and out of the cutting position of the O-ring strip, and it has an openable and closable presser foot that presses and fixes the O-ring strip at the cutting location of the O-ring strip, The device for detecting the moving length of the measuring pulley in the circumferential direction is an O-ring device that displays the moving length of the O-ring strip with reference to the cutting wheel position.
Length measuring and cutting device for ring strips.