SU559141A1 - Device for measuring the belt tension force - Google Patents

Description

one

The invention relates to the field of force-measuring technology and can be used to measure the tension of a tape in tape-moving mechanisms for magnetic recording of various types of information.

The known devices for measuring the tension of the tape, which in the area of contact with the tape contain elastic plates with strain gauges that require contact with the tape on a sufficiently large part of the tape along the tape path, do not provide the required measuring power in hard-to-reach parts of the tape path

1.2.

It is also known a device for extracting & pulling the tension force of a tape, which contains, in the area of contact with the tape, a sensitive element in the form of a contact surface with an adjustable lever, two guides; elastic element in the form of a miacTHJibi in contact with the contact surface of the hypotransmitting element, and a mechanical-to-electrical transducer of electrical quantities made in the form of a flat spiral coil mounted against a plate mounted on the moving part of the sensing element 3. However, this device also does not provide the required accuracy of measurement in hard to reach sections of the tape tract.

The purpose of the invention is to improve the accuracy of measuring the belt tension force in hard-to-reach areas of the tape path.

This is achieved by the fact that in the device containing a sensor-sensitive sensor element located between the belt guides connected with the mechanism for fixing the sensor element, elastic elements in the form of springs and a converter of mechanical quantities into electrical ones, the output of which is connected through the measuring signal generating circuit to the measuring device, the attachment mechanism of the sensing element is designed in the form of a bar, the ends of which are hingedly connected to four parallel located sub-bases reed interfacing, interacting with the mechanical preoperator, into the electric one, and a rocker with a weight is inserted into the reed, which is held relative to the guides with a spring uiapmipa and is pivotally attached to the middle of the bar.

FIG. 1 shows a device for measuring5. The tension of the belt, the cut; in fig. 2 is a view along arrow A in FIG. one; in FIG. 3 - a functional scheme (the action of forces from the ribs .. tape on the rod); in fig. 4 - the same. distribution of forces acting from the side of the tape on the rod; in fig. 5 shows a fundamental diagram of the device.

The device contains sensitive ones): an element in the form of a rod 1, in contact with the tape 2. A rod 1 is located between the guides 3 of the movement of the tape 2 and rigidly attached first to the fastening mechanism, made in the form of a strip 4, the ends of which are hingedly connected to four jumpers 5, connected via hinges b with guides 3 movements of the tape 2; elastic elements in the form of springs 7, holding the rod 1 with the plug 4 in a predetermined position relative to the guides 3, the yoke 8 with a load 9 attached through the hinge Yu to the middle of the bar 4 and held relative to the guides 3 using the spring hinge 11, and the mechanical transducer values in electrical, consisting of a duralumin plate 12 fixed on one pair of jumpers 5, a ferrite plate 13 fixed on another pair of jumpers 5, and two flat spiral coils 14 interconnected in series and n Connected to a measurement signal generating circuit consisting of a generator 15, a frequency detector 16 and a matching circuit 17, the output of which is connected to the measuring device 18.

The device works as follows

When the tension P of the belt 2 changes, the resultant force T acting on the rod 1 changes. The rod's stiffness is chosen much greater than the rigidity of the spring 7. On the side of the belt 2, force 1 acts on the rod 1. Under the action of a force T, a rod 1 with a strip 4 and an alternator 1ch 5 will be displaced relative to the advancing 3 until the force TC is balanced by a force

acting on the side of the spring 7. In this case, the gap between the plates 12 and 13 to the flat spiral coils 14 will change, causing deflection of the I1 coils 14. This in turn will lead to a change in the frequency of the generator 15, since the flat spiral coils 14 are contours of this oscillator. Changing the frequency will cause a corresponding voltage deviation at the output of the frequency detector 16, which through the matching circuit 17 will go to the measuring device 18.

The rocker 8 with a load 9 performs static balancing of the hinge mechanism with the rod 1.

Claims (2)

1. USSR author's certificate No. 352157, M. Cl. G 01 P 5/10, 1970. 2. USSR author's certificate No. 352158, M.C. Q O1 2 5/10, 1970. 3, USSR Author's Certificate No. 470720, M. C O-01 R 5/04, 1973 (prototype). / (77 14- / 3 b .1 if - ..