SU1749709A1 - Plotter pinch roller unit - Google Patents

Abstract

The invention relates to instrumentation, namely to the leading nodes of the tape-drawing mechanisms of plotters. The aim of the invention is to increase the reliability in terms of vibration and reverse, which improves the accuracy of the graphic design. The plotter's pinch roller assembly contains a shaft with friction portions at the interface through a record carrier with rotating pinch rollers. Each pressure roller is mounted in an L-shaped carriage. The carriages are fixed on a rotary guide parallel to the axis of the drive shaft, with the possibility of longitudinal movement and set depending on the width of the record carrier with subsequent rigid fixation. The clamping force of the rollers is adjusted by a screw abutting the lower surface of the leaf spring of the pivoting lever, and is set depending on the thickness of the recording medium with its subsequent self-locking through the spring-loaded pivoting levers control lever, which is installed with the possibility of limited rotation. 3 il. C / 4

Description

The invention relates to instrumentation, in particular to the leading nodes of the tape-drawing mechanisms of phapple builders.

Tablet plotters use air and electrostatic presses to receive the recording media, which is unacceptable because of its specificity for roller type plotters.

. In drum-type plotters, only perforated recording media are used, and, therefore, the carrier-to-drum devices have design features characteristic of this type of plotters.

In the DMR-51/52 roller plotter, the node of the roller roller is placed on the bracket. With the help of pivotally connected levers, the axis on which the roller is fixed is rotated and, due to the displacement of the centers of the axis and the roller, translates the latter

to the lowest position. Thus, In this way, the roller presses the recording medium to the abrasive drive shaft.

A disadvantage of the known construction of the assembly is that there is no provision for changing the position of the pressure roller over the shaft along its length, and the force of pressing the roller against the friction shaft section is not regulated, which ensures reliability during reverse operation. In this manner, the possibility of using a recording medium of any width and of any thickness is limited.

The closest technical solution is the pinch roller assembly of the plotter mechanism of the plotter, ensuring the forward movement of the recording medium. The clamping unit is mounted on an additional suspended T-track so that the carriage

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The pressure roller hangs down from the additional track and the operating wheel easily slides along it, since the fascinating elements, on the axis of which the swivel pinch roller lever is mounted, freely fit around the additional track, and the springing occurs with a rather small force. The roller is pressed against the drum by means of a pivoting lever.

A disadvantage of the known assembly is that. that, despite springing, the structure does not exclude the spontaneous movement of the pressure roller carriage along the drum axis during vibration caused by the reversible mode of operation due to the free (with a gap) suspension of the additional track. For the same reason, it is possible to move the carriage with a pinch roller across the drum and, as a result, shift the point of the writing pen, which degrades the quality of the graphic design.

The disadvantage is the non-locking force of the roller clamping due to the fact that its lower bearing surface is rounded, and the reversible mode of operation and vibration contribute to the deviation from the set position of the lever and, therefore, to the spontaneous change of the force of pressing the roller to the shaft.

The purpose of the invention is to increase the reliability of the device under the conditions of vibration and reverse by rigidly fixing the position of the carriages of the pressure roller above the shaft and self-locking of the adjustable force of the pressure of the rollers.

This goal is achieved in that the clamping roller assembly of the plotter contains a drive shaft, at the ends and in the center, depending on the width of the recording medium 1 used, there are friction sections mating through the recording medium with rotating pressure rollers to provide translational movement of the recording medium. Moreover, each pressure roller is installed above the shaft and parallel to it in a separate carriage .L-shaped. The carriages are located on one side of the mounting bracket and are mounted on a guide along which they can move longitudinally with the installation, depending on the width of the recording medium and with the possibility of pressing the roller through a spring-loaded pivoting lever. The guide is installed in the bracket with the possibility of rotation around its axis, parallel to the axis of the drive shaft, together with the carriages mounted on it.

The selected position of the carriage above the shaft along the guide is rigidly fixed in the upper part of the carriage, and the regulation of the force of pressing the roller in the shaft and its self-locking is provided by means of the control lever mounted on the axis. parallel to the axis of the drive shaft and located in the mounting bracket on the other side. At the top of the lever

0 control is made a groove with a limiting stop placed in it, mounted in a bracket and intended to limit the movement of the control lever, namely located at its bottom

The 5 parts are parallel to the axis of the drive shaft of the rotating thrust roller coupled with the leaf spring of the spring-loaded swivel lever and mounted for movement along it. One

0 the end of the pivot arm is fixed rigidly on the guide and perpendicular to it with the possibility of simultaneous rotation around its axis. At the other end of the pivot arm is an adjusting screw which rests on the lower surface of the leaf spring mounted on the upper plane of the pivot arm. The end of the leaf spring from the side of the guide is fixed

0 fixed on the pivot arm. The design provides for the adjustment of the necessary force of pressing the pressure rollers to the drive shaft and its self-locking.

5 Figure 1 shows the pinch roller assembly in dynamics: Figure 2 - the same. in statics; on fig.Z - a node, a general view.

The carrier b (Fig. 1) is pressed by the roller 7 to the friction surface of the shaft 1, while rotating it to either side, the carrier b will move in a horizontal plane perpendicular to the axis of the shaft 1.

The pinch roller assembly in statics (Fig. 2), i.e. recording medium 6 is released,

5 is not pressed against the friction surface of the shaft 1. At this position of the pressure roller, the carrier 6 is inserted before starting work and removing it after it is finished. In the clamping roller assembly of the plotter (Fig. 3), the recording medium 6 is pressed by the roller 7 to the fractional surface of the shaft 1 (dynamic position). The static position of the assembly is different from the dynamic presence of the gap between the roller 7 and shaft 1.

The pinch roller assembly comprises a drive shaft 1 transmitting motion from an engine (not shown). The length of the shaft, depending on the width of the recording medium,

5, the friction sections are made. Above the shaft 1, behind and parallel to it, a guide 2 is installed in bearings (not shown) in the mounting bracket 17. Two L-shaped carriages 3 are freely put on the guide 2 with the possibility of 5 longitudinal movement and installation over the friction sections of the shaft 1 on one side of the bracket 17. The selected position of each carriage 3 along the guide 2 is rigidly fixed in its upper part, having a cut, for example, with a screw 4, which eliminates the spontaneous shift of the carriage 3 along the guide 2 during vibration and reverse.

The carriage 3 comprises an axis 5 parallel to the drive shaft 1 and the guide 2. The condition of parallelism is necessary to prevent movement of the recording medium b in operation. The carriage 3 is made by pressing. The parallelism 20 of the carriage 3 of the axis 5 of the pressure roller 7 and the groove for the guide 2 is ensured by the precision of the equipment for pressing the carriage. A pinch roller 7 is put on the axis 5, which contacts the drive shaft 1 through the recording medium 6 25 and receives a rolling motion from it, providing, with a certain force of pressing the roller 7 to the shaft 1, translational movement of the recording medium. "30

The design of the device provides the ability to adjust the force required to press the carrier b. recording presser rollers 7 to the friction surface of the drive shaft. Usi-35

The clamping pressure depends on the hardness of the pinch roller material and the type of recording medium (ie paper, film). A set clamping force is self-locking, which is provided through 40 control lever 8 and pivoting lever 9. One end of the pivoting lever 9 is rigidly fitted on the axis of the pivoting guide 2 perpendicular to it with the possibility of simultaneous rotation with the guide 45

around its axis.

For springing the pivot arm 9, a torsion spring 10 is provided.

It may contain one to two workers.

coil. The ends of the spring are bent at an angle of 50 opposite one from the other side and parallel to one another. The bent ends of the spring are inserted into the holes on the mounting bracket 17 and the pivot arm 9. On the upper plane of the swing arm there is a plate spring 11 fixed rigidly on the side of the guide 2, for example, under a screw (not specified), and its opposite end is free . Pivot arm position 9

it is adjusted by the stop screw 12. screwed on the other end of the pivot arm 9 and resting against the lower surface of the free end of the leaf spring 11. When the adjusting screw 12 is turned out (not installed), the spring 11 fits snugly to the surface of the lever 9 (initial position of the spring 11 before adjustment) . The force required for the pressing of the roller 7 to the shaft 1 is provided through a control lever 8 mounted rotatably on an axis 16 parallel to the axis of the drive shaft 1.

The axis 16 of the control lever 8 is located in the mounting bracket 17 on the side opposite to the positioning of the carriages 3. At the bottom of the control lever 8, a rotating thrust roller 13 is fitted parallel to the plate spring 11 and can be moved along the plate spring 11. The amount of movement of the roller 13 is limited by the length of the radial groove 14, made in the upper segment of the segment of the control lever 8 with the limiting stop 15. The limit stop is mounted on the mounting edge 17. At the extreme left (up to the stop of the limit stop 15 in the groove 14) position of the control lever 8, the pressure roller 7 is raised above the shaft 1 - the inoperative position, and at the extreme right position of the lever (the same until the stop limit 15 stops in the groove 14) - working, i.e. The pressure roller 7 is pressed against the friction portion of the shaft 1 with a force sufficient and necessary for the translational movement of the recording medium 6.

The clamping force set by the adjusting screw 12 and the transfer of the pressure roller before recording begin in the working position (when it is pressed against the drive shaft, touches it) is self-fixed by the position of the control lever 8 and the rotary lever 9, at which the point of support of the roller 13 of the control lever 8 into the leaf spring 11 , the axis of rotation of the control lever 16 and the point formed by the base of the perpendicular, lowered from the axis of rotation of the rotary lever 9 to the leaf spring 11, are arranged so that they form an acute angle with the apex at the point yn pa of the rocker roller 13 August of the spring 11.

The node works as follows. The operator servicing the device by loosening the screw 4. Freely moves one of the bolts 3 along the guide 2 and fixes its position above the shaft 1 depending on the width of the recording medium. The recording medium b is mounted on the drive shaft 1 and is leveled. that its side edges are located in the friction areas and perpendicular to the axis of the drive room 1. At the same time, the carriage 3 is in an inoperative position l. elevated above the shaft 1 (figure 2). I exert a finger on the upper segment part of the control lever 8, the operator moves it clockwise up to the stop, i.e. until the stop stop 15 rests on the left corner of the radial groove 14. At the same time, the thrust roller 13 of the control lever overcomes the upward force created by the return spring 10, which is constantly straightened (rotated) and rotated Up the rotary lever 9 with the leaf spring 11 fixed on it, from the horizontal position to the vertical one, moves along the leaf spring to the far left position. In this position, the point of support of the roller 13 of the control lever of the rocker 8 into the leaf spring 11. The axis 16 of rotation of the lever 8 of the control and the point which is perpendicular to the base, is lowered from the axis of rotation of the rotary lever 9 onto the plate spring 11, so that they form a sharp the angle with the apex at the point of support of the roller 13 of the control lever into the leaf spring 11. Such an arrangement prevents the roller 13 from spontaneously moving to the right, and to the left its movement is limited by a restrictive stop 15.

Thus, through the control lever, the clamping force of the pressure roller 7 is self-locking to the friction surface of the drive shaft 1, which provides for the signal the translational movement of the recording medium without slipping (Fig. 1). Adjusting the pressure of the roller. 7 is produced by screw 12, depending on the thickness of the recording medium b. When screwing the adjustment screw 12 into the pivot arm 9, the end of the screw 12 rests against the leaf spring 11, on the other side of which, on top, the thrust roller 13 does not allow the leaf spring 11 to rise, thus causing the turning arm 9 to move down, i.e. turning the lever 9 together with the guide 2. In turn, the carriages 3 located on the guide rotate with it until the pressure roller 7 touches the friction surface of the drive shaft 1. At the end of the work, the operator turns the control lever 8 counterclockwise, the stop roller 13 moves on the leaf spring 11 to the right, and under the influence of the return spring 10, the pivot arm 9

rotates together with guide 2. carriage 3 and with pressure rollers 7. frees up the recording medium 6.

Thus, the proposed design of the assembly, which ensures the pressure of the roller, in comparison with the known, excludes the accidental deflection of the control lever during servicing of the device, during reversal and vibration, providing a constant set clamping force, which contributes to reliable movement of the recording medium under the conditions of vibration and reverse and improving the quality of graphic performance - no point shift occurs. To this

Claims (1)

5 contributes to the rigid fixation of the adjustable position of the carriages over the drive shaft, preventing accidental, spontaneous displacement of the carriages along the drive shaft. The adjustment of the clamping force makes it possible to use a recording medium of various thickness. Claims of the plotter roller clamping unit, comprising a drive shaft with frictional areas, pressure rollers, the axes of which are parallel to the axis of the drive shaft and mounted with a possibility of coupling through the recording medium with the friction sections of the drive shaft 0 L-shaped carriages mounted longitudinally, spring loaded pivot arm, pivotally mounted control lever, different 5 topics. that, in order to increase the reliability of the device in terms of vibration and reversal, a lamellar spring of the pivoting lever, an adjusting screw, an installation bracket, a guide, an axis 0 which is parallel to the axis of the drive shaft and mounted in the bracket so that it can rotate around its axis, the carriages are mounted on one side of the bracket on the guide with the possibility of longitudinal movement along it and rigid fixation of their position as well as rotation along with the guide around its axis, the lever control is mounted on an axis parallel to the axis of the drive shaft and located on the crown on the other side of it, at the bottom of the control lever there is a stop roller coupled to the leaf spring and mounted by moving along it, at the top of the control lever 5 a slot is made mating with a limiting stop mounted in the bracket, one end of the pivot arm is rigidly mounted on the guide with the possibility of simultaneous rotation around its axis, and at the other end of the pivot arm there is an adjusting screw that mates with the bottom surface of the lamellar springs mounted on the upper plane a pivot arm, the end of the leaf spring from the side of the guide being fixedly mounted on the pivot arm. J Fig, / AT # FIG. 2 Editor A. Kozoriz Compiled by B.Sychev Tehred M. (Yorgental Fig.Z Proof-reader E Lonchakova