JPS6244327A - Position adjuster - Google Patents

Abstract

PURPOSE:To enable automatic micro adjusting of a fixing position with micro force thus to improve the work efficiency by providing a rough positioning means of screw tightening means, drive means, rolling means in a plane normal against the axial direction and buffer means against the rolling. CONSTITUTION:Upon determination of adjusting rotation and direction of guide rollers 5, 6 of VTR1 to be adjusted on the basis of data, an elevatable base 24 will lower to absorb shift through buffer member 25 while rolling against a base 23 thus a pin 43a is inserted into a hole 16a. Upon rough positioning of a jig 10, the base 23 will further lower to contact the tip section of jig 10 against the head section 46 thus to set the sleeves 37a, 37b to the guide section 45 through supply of compressed air and upon rotation of a motor 26 with lower rotary force, the jig 10 will contact against the head section 46 thus to engage the jig 10 with notched recess 11 through lowering of base 24. Upon contact of the jig 10 against the wall of recess 11 through rotation of a motor 26 to produce the reaction rotary force thus to reach to the limit rotary force and stepped out, it is switched to driving current level thus to provide a necessary adjusting command to the driving circuit and to finish the micro adjustment.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a position adjustment device that can automatically adjust the mounting position of parts fastened with screws by a minute amount using a minute force.

[Summary of the invention]

Conventionally, in magnetic recording and reproducing apparatuses (hereinafter referred to as VTRs), when adjusting the height of a chive travel system guide part, as an example of adjusting the position of parts fastened with screws, for example, as shown in Fig. 6. As shown, the VTR's cheap run,
The system 1 is provided with a cylinder 3 and idle rollers 5 and 6 arranged on the inlet and outlet sides of the cylinder 3, and each regulating stepped surface A of the inlet guide roller 25 and the outlet guide roller 6, A device is used that records and reproduces video signals while regulating and guiding the position of the magnetic chip f2 traveling in the direction of the arrow by B and the lead 7 which is a regulating stepped surface of the cylinder 3.

Therefore, in order to obtain high image quality and compatibility with other VTRs, the magnetic tape 2 must be accurately run in a regular position. In particular, the positional accuracy of the input side idle roller 5 and the output side guide roller 6 is important. for example,
If the guide roller 5 or 6 is out of position, the magnetic tee 702 will be pressed against one side of the regulating stage A or B of the guide roller 5 or 6, causing damage to the magnetic tape 2.

Furthermore, the magnetic tape 2 rises from the lead 7 of the cylinder 3, making it impossible for the head 4 of the cylinder 3 to accurately trace the magnetic tape 2, resulting in a decrease in image quality.

Obtain the high-quality image quality of a VTR that has been conventionally achieved, and
To achieve compatibility with other VTRs, the position of the tape running system guide parts can be adjusted using a magnetic chi 7° (alignment The FM output signal, which is a video output signal of the head 4, shows the alignment between the head 4 of the cylinder 3 and the track 8 (see Figure 7) of the alignment tape 2' when the tape 2' is played back by the VTRI to be adjusted. Waveform 9 (
8) on an oscilloscope, the operator adjusts the idle roller 5 so that the shape of the FM output signal waveform 9 is stable, not rectangular, as shown in FIG. The height of 6 was slightly adjusted. This adjustment work can be carried out by the operator engaging the jig 10 (see Fig. 9) in the cutout recess 11 and turning the jig 10. After the female screw 14 that is paired with the male screw 13 provided on the mounting base 12 is screwed in to the above-mentioned adjusted state, it is fixed to the lower end of the male screw 13 and fitted into the fitting hole 18 of the mounting base 12. A straight pin 18 is fixed by a fixing screw 15. Note that 16 is a chassis.

In this way, the work of finely adjusting the height of idle rollers 5 and 6 is difficult because the amount of adjustment has a subtle effect on the FM high output.
This is extremely difficult and requires skill, and since the work is done while observing the FM output signal waveform 9 using an oscilloscope, individual differences are likely to occur, and there are many variations in adjustment accuracy and time depending on the operator. This was low productivity work.

Note that, for example, Japanese Patent Application Laid-Open No. 127261/1984 is related to this type of adjustment. This adjustment technology provides a manual adjustment jig that allows screw tightening to smoothly adjust the relative position between parts without the need for a pigtail, making position adjustment easier and more accurate. It is something.

All of the conventional techniques described above were performed manually. Therefore, no consideration was given to the automatic position adjustment device.

When the above-mentioned contents are automatically adjusted, the jig 10 is engaged in the notch recess 11, the jig 10 is rotated by a predetermined adjustment amount, and the height of the guide roller 5 or 6, which is the part to be adjusted, is adjusted. In order to quickly and accurately adjust the position of It is necessary to do so.

However, when the jig 10 is engaged in the notch recess 11,
Normally, play or offset (full rotation) will occur depending on the shape between them. For example, in the case of the jig 10 shape shown in Fig. 10, the maximum is ±90° for a minus-shaped jig as shown in Fig. 10(a), and ±90° for a plus-shaped jig as shown in Fig. 10(b). Maximum ±4 evenings, Figure 10(c)
As shown in FIG. 2, in the case of a hexagonal jig, a maximum of ±30° of backlash or offset occurs when the jig is engaged in the cutout recess 11, resulting in a decrease in accuracy. On the other hand, in order to reduce the above-mentioned length or offset amount, it is necessary to provide a means to ensure very high relative positioning accuracy when the jig 10 is engaged in the notch recess 11. This requires a sophisticated and complicated mechanism such as precision fitting and insertion into a hole, and although accuracy is guaranteed, speed is lacking.

In this way, conventionally, when the jig 10 is used to automatically finely adjust the position of parts in a screw-jointed installation, the problem of engagement between the notch recess 11 and the jig 10 causes structural problems or problems. This has the disadvantage that it is difficult to make precise position adjustments due to the offset, and if the structure is designed without offset, it is difficult to make quick position adjustments.

Due to the above, in the prior art, there were many means for manually adjusting the position, although the work efficiency was reduced.

When making fine adjustments automatically and continuously with the rough jig 10 engaged in the notch recess 11, the idle roller 5
．． It is necessary to prevent external force from being applied to 6. That is,
The idle roller 5 is adjusted slightly using a jig due to the mismatch in the axial position between the notch recess 11 and the guide roller 5.6.
．． 6, a so-called guide roller in a direction perpendicular to the axial direction 5.
When a force is applied to knock down the cylinder 25.6, it tilts the idle draw 25.6 and slightly changes the contact between the track 8 of the alignment check f2' and the head 4 of the cylinder 3. Since this will affect the shape of the 9FM output signal waveform 9, it is necessary to ensure that almost no lateral force is applied to the idle roller 5.6 (approximately 50 gf or less) during adjustment.

For the above reasons, in the past, it was necessary to pull out the jig 10 from the notch recess 11 of the idle roller 5.6 each time an adjustment operation was performed, which resulted in a problem in which the adjustment took an extremely long time and reduced efficiency. There is.

[Purpose of the invention]

The present invention solves the above-mentioned conventional problems, and makes it possible to automatically adjust the mounting position of parts fastened with screws by a small amount using a small amount of force, thereby improving work efficiency and positioning the parts fastened with screws and the like with high accuracy. The object of the present invention is to provide a regulating device.

[Summary of the invention]

In order to achieve the above-mentioned object, the present invention provides a position adjustment device that adjusts a small amount of screw-connected fittings using a minute force, in which a tool that engages with and tightens the screw is roughly attached to the fitting. A rough positioning means for positioning is provided, a driving means is provided for rotating a rotary shaft holding the tool, and the driving means and the rotary shaft are oscillated in a plane perpendicular to the axial direction of the rotary shaft. a buffer means for absorbing the
A rocking means is provided between the driving means and the rotary shaft so that the rotary shaft can swing in a plane perpendicular to the axial direction of the rotary shaft, and the mounting part is moved in the axial direction of the rotary shaft. It is characterized by being configured so that positioning can be performed within a plane perpendicular to the plane without applying any load.

[Embodiments of the invention]

1 to 5 showing embodiments of the present invention will be described below. FIG. 1 is a partially sectional front view of a height position adjustment device for a side part in a tape running system of a VTR showing an embodiment of the present invention, FIG. 2 is a partially sectional side view of FIG. 1, and FIG. are the control configuration diagrams in Figures 1 and 2, and Figures 4 (, ) to (
0) is a position explanatory diagram of the adjustment jig and the notch recess of the part to be adjusted, and FIG. 5 is a diagram showing the relationship between the speed and rotational force of the stepping motor.

In FIGS. 1 and 2, 20 is a pace, and four guide blocks 20a to 20 are provided at both upper and lower ends of one end surface.
d is fixedly supported, and these four are the id blocks 20.
A to 20d fixedly support both ends of the two linear guides 21a and 21b. 22 is a cylinder, and is placed between the two linear guides 21a and 2Ib of the pace 20! A piston rod 22 b is fixedly supported via a racket 22 a and slidably supports a piston rod 22 b that reciprocates by supplying and discharging compressed air. 23 is the back side of the flat plate-shaped body 23a (the side of the above-mentioned pace 12)
, there are four linear bearings 23 supported slidably in the vertical direction by the two linear guides 21a and 21b.
b, 23c, 23d, 23e, and an L-shaped block 23f connected to the tip of the piston rod 22b of the cylinder 22 are fixedly supported, and a flat support plate 23 is provided on the surface in the vertical direction. g, and two side plates 23h are fixedly supported in the vertical direction at both ends. 2
4 is a rectangular movable plate, and the support plate 23'g
Two shock absorbers 4 made of rubber are inserted between the support plate 23g and the support plate 23g, which are arranged parallel to each other with an interval between them. 24m and a small diameter hole 24b opening at the upper end surface is formed. The two buffer bodies 25 are each formed to have a spring constant approximately several times as large as the allowable lateral force (approximately 50?).
0's horizontal movement is restricted. 26 is a stepping motor, and the hole 2 formed in the support plate 23g is
3 i is fixedly supported on the upper end surface of the movable plate 24 so as to pass vertically through the interior of the small diameter hole 24b, and the flexible cup f IJing is inserted into the large diameter hole 24a with its shaft end passing vertically through the interior of the small diameter hole 24b. It is connected to 27. This flexible coupling ring 27 is formed of three coupling pieces 27a, 27b, and 27a in the vertical direction, and the upper cup 7' IJ The coupling pieces 27a are connected so as to be movable in the left and right horizontal directions in FIG. 1, and the lower coupling pieces 27c are connected so as to be movable in the front and back directions in FIG. 28a,
Reference numeral 28b denotes two rotary encoders arranged side by side, which are fixedly supported on a T-shaped frame 29 fixedly supported between two step motors 26 on the upper end surface of the moving plate 23, and have shaft end portions 28'a and 28'b, respectively. Coupling 30a, 3
It is connected to the two step motors 26 through 0b. Reference numeral 31 denotes an air bearing, which is fixedly supported on the lower end surface of the movable plate, and inside thereof, two rotating bodies 33a, 3 are connected via an air passage 32 connected to a compressed air supply source (not shown).
3b and seven ring portions 34a, 34b fixedly supported on one part of the outer peripheral surface of the rotating bodies 33a, 33b are rotatably supported. These two rotating bodies 33m and 33b
are respectively attached to the upper part of the interior of the flexible coupling n
A spherical bearing 36a supports the shaft portions 35a and 35b fixedly supported at the lower end of the lower coupling piece 27c.
, 36b are fixedly supported, and a funnel-shaped sleeve at the lower part thereof slidably supports the upper large diameter part of the id 37m, 37b. 38a and 38b are sedge line shafts whose upper ends are connected to the shaft portions 35a and 35b, and whose lower ends are connected to the sleeve 37a.

Spline portions 39 a, 39 formed on the outer circumferential surface connected to a jig 1o that is slidably inserted into the small diameter portion of 37 b.
b is fitted into the inner circumferential slide portions of the rotating shafts 40 a and 40 b, and is constantly pressed downward by the elastic force of the sedge rings 41 m and 41 b. The rotating shafts 40m, 40b are connected to the spherical bearings 36a, 36b, and the outer circumferential surfaces of the rotating shafts and the inner circumferential surfaces of the upper large diameter portions of the sleeves 37a, 37b are connected via VC links 42a, 42b. Insert,
This spring 42. The sleeve constantly presses the id 37a137b downward due to the elastic force of the sleeves a and 42b. 4
3 is a block, fixedly supported on the lower end surface of the air bearing 31, and a positioning pin 43 whose tip is inserted into the positioning hole 16a formed in the chassis 16 on the lower end surface.
m is fixedly supported.

Next, in FIG. 3, the microprocessor KL instructs the motor drive circuit 45 to drive conditions (drive current, drive speed, drive amount, drive direction) for the step motor 26, and also controls the rotation amount of the step motor 26. When the encoders 28m and 28b are digitized and input to the microprocessor I, and the alignment tape 2' is run on the VTRI, the idle rollers 5.6
A video signal obtained from the head 4 corresponding to the relative positional relationship between the cylinder 3 and the head 4 is digitized by an A/1 converter 48 and inputted to the microprocessor 44. .

Next, in FIGS. 4(a) to 4(c), reference numeral 45 indicates a guide portion formed at the inner peripheral surface end of the small diameter portion of the sleeve guides 37m and 37b;
is the inner wall of the notch recess.

Since the position adjusting device according to the present invention has the above-described configuration, the operation will be described next.

As shown in FIGS. 1 and 2, first, an alignment chip f2', which is a standard magnetic tape on which standard video signals and the like are recorded on the VTRI, is set in the VTRI to be adjusted and reproduced.

The guide roller 5.6 and the cylinder 3 are temporarily fixed at a predetermined height and predetermined tightening force, and the rough position has been adjusted.
The reproduction output of the alignment tape 2' guided and traveling by the lead 7 of the cylinder 3 is obtained as a video output signal from the head 4 of the cylinder 3, and the video output level digitalized by the A/D converter 48 is sent to the microprocessor 44. . Then, the relationship between the amount of rotation, which is the amount of position adjustment of the guide roller 5.6, the direction of rotation, and the video output level is determined experimentally in advance, and the data is stored in the microprocessor, and any video output is performed. Obtain the adjustment rotation amount and rotation direction corresponding to the level from the above data.
When R1 determines the adjustment rotation amount and direction of the idle roller 5.6, it operates the cylinder 3 and lowers the elevating pace. Positioning hole 16
Insert into a. At this time, the deviation between the position of the positioning bin 43a and the positioning hole 16a is absorbed while the moving pace 24 swings relative to the elevating base 23 by the buffer body 25. When the jig 10 is roughly positioned relative to the idler roller 5.6 by the positioning pins 43m in this way, the elevating base 23 is further lowered, and the sleeve guides 37m and 37b are moved to the guide portion 45 of the idler roller 5.6. Since the tip of the jig 10 is guided by the guide roller 5.6, the tip of the jig 10 comes into contact with the head 46 of the guide roller 5.6. (See FIG. 4 (1)) At this time, the air passage 32 of the air bearing 31
Compressed air is supplied to center the rotating bodies 33 &, 33b, so that the sleeves 37a, 37
b is placed on the guide portion 45 of the idle roller 5.6.
't%・3 more ty e y 3' % l t2
From the relationship between the speed and the rotational force of the idle roller 5.6, as shown in FIG. When the stepping motor 26 is rotated in the previously determined rotational direction with the drive current set to 1, the jig 10 hits the head 46 of the guide roller 5.6 as shown in FIG. 4(b). come into contact with The jig 10 continues to move (the -s 24 is lowered, but at this time the jig 10 is rotated so that the spline shafts 38m and 38b are aligned with the rotation shaft 40a).
, 40b, and the spring 41&
, 41b and escapes upward against the elastic force of jig 1.
0 rotates to be in the same phase as the notch recess 11, the jig 10 is lowered by the force of the springs 41a and 41b, and the jig l
O is engaged with the notch recess 11. The state at this time is the 4th
As shown in Figure (b), since they are not in contact with each other, almost no rotational force is generated. When the steering motor 26 further rotates, the jig 10 comes into contact with the wall 47 of the cutout recess 11, resulting in the state shown in FIG. 4(e). At that time, a rotational force is generated by the reaction force from the guide roller 5.6, and now the fifth
In the figure, considering the case where the rotational speed of the stepping motor 26 is set to N, the limit rotational force TI corresponding to the drive current value II is reached. The stepping motor 26 tries to rotate further, but because TI is less than the required rotational force (maximum value Th, minimum value Tt) of the idle roller 5.6, it steps out. Detection of this tax adjustment phenomenon is performed using the stepping motor 2.
6 is operating at the rotational speed N, the microprocessor must monitor the value Δp/Δ, which is the ratio of the change Δp in the output and the force obtained from the rotary encoders 28m and 28b during the time Δt. , Δp/Δt<<N, it is determined that synchronization is out of step.

As a result of this tax adjustment detection, the microprocessor 44 switches the drive current value I0 to obtain a rotational force larger than the maximum value Th of the required rotational force of the guide roller 5.6, as shown in FIG. The obtained required adjustment rotation amount, rotation direction, and rotation speed (N) commands are given to the motor drive circuit 45, and the idle roller 5.6 is rotated by a predetermined adjustment amount to complete the fine adjustment. Thereafter, the playback output of the alignment tape 2' is again obtained from the head 4 as a video output signal, and the video output level is sent to the microprocessor 44 via the A/D converter 48. Then, the quality of the adjustment is determined by comparing it with preset adjustment specification conditions. Here, if a defect is determined, the above adjustment operation is repeated.

Here, when performing the quality determination after the adjustment, compressed air is supplied to the air passage 32 of the air bearing 34, and the rotating body 33a.

33b is configured as an air thrust bearing so that no load is applied to the idle roller 5.6 in the radial direction, and the force generated by the adjustment device acting on the guide roller 5.6 via the jig 10 is Minimize the influence on the video output signal as much as possible. Therefore, multiple adjustment operations can be performed continuously without removing the jig 10 from the push roller 5.6.

After the adjustment is completed, air is supplied to the air passage 32 of the air bearing 31, the rotating bodies 33m and 33b are placed in the air thrust bearing state, and the jig 10 is pulled up from the notched recess 11 of the guide roller 5.6 to lift the cylinder 22. The adjustment work is completed by lifting the elevating base 23 with force and removing it.

〔Effect of the invention〕

According to the present invention, as is clear from the above description, the rotating shaft of the adjustment jig can be engaged with the rotating shaft of the adjustment jig without any problem while maintaining the initial mounting state of the mounting parts connected by screws.
Rotation adjustment can be performed by a predetermined amount with high precision and quickly without damaging the contact portion. Also, by automating the adjustment,
Compared to manual work, it is possible to improve work efficiency and quality, and it has the effect of improving reliability.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view of a height position adjustment device for side parts in a tape running system of a VTR showing an embodiment of the present invention, FIG. 2 is a partial cross-sectional side view of FIG. 1, and FIG. Fig. 1 and Fig. 2 are control configuration diagrams, Fig. 4 (,) to (c) are position explanatory diagrams of the adjustment jig and the notch recess of the part to be adjusted, and Fig. 5 is the speed and rotation of the stepping motor. Diagram showing the relationship with force,
FIG. 6 is a diagram showing the main part of the tape running system of a VTR to which the present invention is applied, FIG. 7 is an explanatory diagram showing the relationship between the chip and the track, FIG. 8 is an explanatory diagram showing the video output signal waveform, and FIG. The figure is a perspective view showing the tip of the adjustment jig, and FIGS. 10(L) to (c) are perspective views showing the shape of the tip of the adjustment jig and the notch recess of the guide roller. 1... VTR tape running system, 2... Magnetic tape,
3...Cylinder, 4...Head, 5.6...Id roller, 7...Lead, 8...Track, 9...
・FM output signal waveform, 10...Jig, 11...Notch recess, 12...Mounting base, 13...Male thread, 14...
Female thread, 15...Fixing screw, 16...Nyashi, 20
...Base, 21a, 21b...Linear guide, 22
... Cylinder, 23... Elevating base, 24... Moving plate, 25... Buffer, 26... Stepping motor, 27... Flexible coupling ring, 28 m, 28
b...Rotary encoder, 29...Frame, 3
0a, 30b... Coupling, 31... Air bearing, 32... Air path, 33a, 33b... Rotating body, 3
4&, 34 b...7 Ranno part, 35a, 35b-
Shaft portion, 36a, 36b-・Spherical bearing, 37a137b=
- Sleeve guide, 38a, 38b - Spline shaft, 40 a, 40b... Rotating shaft, 41 a, 41
b, 42 a, 42 b... Sgeling,
43...Block, 44...Microprocessor,
45...Guiding part, 46... is the head of the hydraulic roller, 47
... Inner wall of notch recess, 48 ... A/D converter. Agent Patent Attorney Tadashi Akimoto Act No. 1vA Fig. 3 12' Fig. 4 Fig. 5 Fig. 61 Fig. 7 Fig. 8 Fig. 9 Fig. 10 (a) (b) (c)

Claims (1)

[Scope of Claims] 1. In a position adjustment device for adjusting a minute amount with a minute force of a mounting part connected by a screw, a rough position adjustment device for roughly positioning a tool that engages with the screw and fastens the screw to the mounting part. A positioning means is provided, and a driving means is provided for rotating a rotating shaft that holds the tool, and the driving means and the rotating shaft are provided with rocking in a plane perpendicular to the axial direction of the rotating shaft. A buffer means and a swinging means are provided between the driving means and the rotating shaft so that the rotating shaft can swing in a plane perpendicular to the axial direction of the rotating shaft, and the mounting part is rotated. A position adjustment device characterized in that it is configured to be able to perform positioning within a plane perpendicular to the axial direction of a shaft without applying any load. 2. The driving means is provided with means for controlling the rotational force and amount of rotation of the rotating shaft, and means for detecting the start of rotation of the threaded portion of the attachment part, Claim 1 Position adjustment device as described in section.