SU711625A1 - Tape-driving mechanism take-up unit - Google Patents

Description

one

The invention relates to instrumentation and can be used in the manufacture of tape mechanisms.

A tape mechanism is known in which the disc cassettes are connected to a perpendicularly arranged drive roller 1. In this case, the constant tension of the magnetic tape as the reel is filled is achieved by moving the drive roller synchronously to the last turn of the roll and this is achieved by using a follower device in contact with the roll.

The disadvantages of this device are the design complexity and insufficient uniformity of the tension of the magnetic tape.

Also known is the receiving unit of the tape drive mechanism, which contains a roll of magnetic tape, which is located on a disk cassette that interacts with a drive roller mounted on the drive shaft with a pin connected to the drive, a drive roller movement unit synchronously with the second turn of the magnetic tape, and belt 2.

However, this device also does not provide the required uneven tension of the magnetic tape.

The purpose of the Invention is to increase the uniform tension of the magnetic tape.

For this purpose, in the proposed device, the drive roller moving unit is provided with an axis, a screw shaft, a first, second and intermediate shears and a cylinder, the first pulley being located on

the screw shaft and connected through the belt with a second pin, planted on one end of the axis, the other end of which is connected via an intermediate pulley with the pin of the drive shaft and the drive, and a cylinder whose length is equal to the difference between the maximum and minimum radii of the rolls of the magnetic tape. on the axis, the drive roller is located on the screw shaft and is connected to the cylinder.

FIG. 1 shows the receiving Y-green tape drive mechanism; in FIG. 2, section A-A in FIG. one; in fig. 3 shows a section BB in FIG. one.

The device contains a disk reel 1, a screw shaft 2, on which the first pulley 3 and a driving roller 4, which is in engagement with a disk reel, moving along the screw shaft 2, are fixed, and also an axis 5, on which the second pulley is rigidly fixed

6 and cylinder 7 is located associated

with the drive roller 4 with the belt pass 8. The pulley 3 is connected to the pulley 6 via the pass 9. The cylinder 7 interacts with the axis 5 using the clutch 10, the drive shaft 11 through the pulley 12 connected with an intermediate pulley 13 fixed on the axis 5. The drive roller 4 is set at the level of the last turn 14 of the roll 14 of the magnetic tape.

The device works as follows.

The screw shaft 2 receives rotation from the drive through the pulleys and the axis. Lead roller 4 receives rotation from cylinder

7th through the belt 8, wherein the driving roller moves along the screw shaft 2 as the roll bobbin is filled. The driving roller 4 moves along the screw shaft 2 due to the fact that when driving the magnetic tape supplied from the driving shaft 11, the leading Roller 4 is dependent on its position in relation to the coil 14 of the coil after the bottom, and the rotational speed of the screw shaft 2 is constant. When located strictly below the last turn, the angular speed of the driving roller 4 coincides with the angular speed of the screw shaft 2. If the driving roller 4 is closer to the center of the roll relative to the last turn 14, then its angular speed is less than the speed of the screw shaft 2. The difference between the angular velocities of the screw shaft 2 and the drive roller 4 causes the drive roller 4 to move along the length of the screw shaft 2 towards the latter

the coil of the windable roll, and then synchronously follow it as the roll is filled. Pass to 8 moves along cylinder 7, following the leading

The roller 4. The clutch 10 provides the necessary tension of the reeled magnetic tape, and also allows to compensate for the change in the angular velocity of the drive roller 4.

The use of the proposed device will improve the uniformity of the tension of the magnetic tape regardless of the diameter of the roll.

Formula of formula

The receiving unit of the tape mechanism, comprising a roll of magnetic tape, located on a disk sub-cassette interacting with a drive roller mounted on the drive shaft with a pulley connected to the drive, the drive roller moving unit is synchronous to the Last turn of the magnetic tape, and a belt, characterized in that , in order to ensure uniform tension of the magnetic tape, the driving roller displacement unit is equipped with an axis, a screw shaft, first, second 9 sheave pulleys and a cylinder, while the first pulley is located on the screw ohm shaft and connected through the belt with the second pulley, planted on one end of the axis, the other end of which is connected through the intermediate pulley with the pulley of the drive shaft and the drive, and the cylinder, whose length is equal to the difference between the maximum and minimum radii of magnetic tape rolls, is placed on the axis The driving roller is placed on a screw shaft and connected to the cylinder.

Sources - information taken into account in the examination

1. USSR author's certificate hfb3O1735, cl. G 11 B 15/18, 1971.

2. USSR author's certificate, No. 302751, cl. G 11 V 15/18, 1972 (prototype).

P .

Claims (1)

Claim A receiving unit of a tape drive mechanism comprising a roll of magnetic tape located on a disk cassette interacting with a drive roller mounted on a drive shaft with a pulley connected to the drive, a drive unit for moving the drive roller synchronously to the last turn of the magnetic tape, and a passer, characterized in that, with In order to increase the uniformity of magnetic tape tension, the drive roller displacement unit is equipped with an axis, a helical shaft, the first, second y. an intermediate pulley and a cylinder, with the first pulley located on the helical shaft and connected through a strap to a second pulley mounted on one end of the axle, the other end of which is connected through an intermediate pulley to the drive shaft pulley and drive, and a cylinder whose length is equal to the difference between the maximum and the minimum radius of the rolls of magnetic tape is placed on the axis, the drive roller is placed on a helical shaft and connected to the cylinder.