JPS6232357Y2 - - Google Patents

Description

[Detailed explanation of the idea]

This invention relates to an operating device, and particularly to an operating device applied to recording, editing, and the like. In magnetic recording and reproducing devices, so-called VTRs, it is usually necessary to edit recorded magnetic tapes. To perform this editing, generally, first, while watching the playback screen, use playback or rewind fast-forward mode to roughly determine the editing area, and then use normal playback, still playback, slow motion playback, etc. around this editing area to make more detailed edits. The editing point is determined, and the final editing point is determined while checking the previous and subsequent screens through frame-by-frame playback. Conventionally, this type of operating device has one mode switching knob and another operating knob, and the former mode switching knob is operated to select each reciprocating playback mode, the so-called shuttle mode, and the frame-by-frame playback mode, the so-called frame-by-frame playback mode. The magnetic tape was moved for editing by switching between jog and jog modes and using the latter operating knob to command the amount and direction of frame feed in each of these modes. Therefore, in such a conventional operating device, two knobs must be operated in order to switch the mode, making the operation complicated. Further, the operating knob requires two different handling methods for each usage mode. In other words, in shuttle mode, the maximum speed of the operating knob in the normal playback direction or rewinding direction of the magnetic tape must be limited by the rotation angle of the operating knob, whereas in jog mode, the operating knob cannot be used in the playback or rewinding direction. Since it is necessary to realize unlimited frame-by-frame advance, it is necessary to perform unlimited rotation for operation. For this reason, there was an inconvenience that the structure became complicated in order to smoothly execute these two operations. Furthermore, when searching for the vicinity of the edit point in shuttle mode, it is difficult to find the edit point because the tape speed cannot be determined accurately.Furthermore, even if you intend to stop the tape, if the control knob is slightly off from the stop position, the tape will begin to move and the edit point The problem was that it would shift. In order to improve these conventional disadvantages, this invention provides an operating knob that is slidable in the axial direction and rotates integrally with the shaft in the rotational direction.
Two operation knobs can perform two operations: mode switching and tape speed switching, and a rotation detector and brake are placed on the rotating shaft to apply the brake as necessary when in shuttle mode. The tape speed can be clearly seen, and the operation knob is rotated with a click to improve operability. An embodiment in which this invention is applied to a recording/editing device will be described in detail below with reference to the accompanying drawings. 1, 2, and 3 show the configuration of an apparatus according to an embodiment of the present invention. In these figures, a holder 30 is inserted into one end of the rotating shaft 1, and one end of a pin 33 inserted into a hole 31 of the holder 30 is fitted into an axial guide groove 40 of the rotating shaft 1. . Further, the rotating shaft 1 is provided with guide grooves 41a and 41b in the rotational direction. Holder 3
A steel ball 34 is inserted into the other hole 32 of 0,
A spring 35 moves the steel ball 34 into the guide groove 41a or 41.
A set screw 36 is screwed into the threaded portion of the hole 32 for pressing against the hole 32. As a result, when the operating knob is pushed down from the state shown in FIG.
hits the buffer plate 38 and the operating knob 2 stops. At this time, since the steel ball 34 is pressed by the spring 35, a load corresponding to this spring force is applied to the operating knob 2. The same applies when pulling up the operation knob 2. Further, when the operating knob 2 is rotated, the rotating shaft 1 and the holder 30, that is, the operating knob 2 are rotated together by the pin 33. The holder 30 is provided with a ring portion 30a, and the ring portion 30a is moved by vertical movement of the operating knob 2.
determines the position of the operating knob, that is, the driving mode, by intermittent light from a photocoupler 37 fixed to the housing 4. In the figure, when the operating knob 2 is in the upper position, it is the jog mode, and when it is in the lower position, it is the shuttle mode. Further, the rotating shaft 1 is rotatably supported by bearings 3a and 3b provided in the housing 4. A brake disk 5 is provided on the other end of the rotating shaft 1, and a brake magnet 6 is fixed to the housing 4 opposite to the brake disk 5. The brake disc 5 is restrained by this. A disk 7 is fixed to the brake side final end of the rotating shaft 1, and an encoder plate 8 is fixed to the disk 7. This encoder plate 8 is provided with, for example, 40 equally spaced small holes 8a on its outer circumference, and the small holes 8a
The center of the small hole 8a and the encoder plate 8 are located closer to the inner circumference.
The same number of other small holes 8b as the small holes 8a are provided on a line connecting the centers of the holes. Two photocouplers 9 and 10 consisting of a pair of light emitting and light receiving elements are mounted on the housing 4 so as to sandwich the small hole 8a.
It is installed on. Therefore, when the encoder plate 8 is rotated together with the rotating shaft 1 by the operation knob 2, the light from each photo coupler 9, 10 is interrupted by the small hole 8a, and the light from each photo coupler 9, 10 is proportional to the rotation angle of this encoder plate 8. The photocouplers 9 and 10 are arranged so that the pulse signals have a phase difference of 90° from each other. Also, the protrusion 1 of the leaf spring 12 fixed to the end plate 11
A small hole 12b is provided in 2a, and a steel ball 13 having a larger diameter than these small holes 8b and 12b is inserted between this small hole 12b and the small hole 8b of the encoder plate 8. and the end plate 11
By adjusting the position where the steel ball 13 is fixed to the housing 4, the force for pressing the steel ball 13 into the small hole 8b can be adjusted. Therefore, the operation knob 2
When the encoder plate 8 rotates together with the rotary shaft 1, the steel ball 13 enters and exits the small hole 8b, so that a thumping resistance, that is, a click, can be applied to the knob 2. This is synchronized with one of the pulse signals obtained from the photo couplers 9 and 10, for example, the pulse signal obtained from the photo coupler 9. In other words, one pulse signal is generated for each click. Further, a pin 14 is press-fitted and fixed to the disc 7, and a protruding portion 14a of the pin 14 is connected to the pin 14 provided on the brake disc 5.
The hole 5a has a diameter larger than that of the hole 5a. Therefore, when the brake disc 5 is restrained by energizing the brake magnet 6, the disc 7, that is, the rotating shaft 1 is restrained, but the pin 14 and the brake disc 5 are restrained between them. There is a backlash due to the difference in the diameter of the hole 5a. The magnitude of this backlash is determined so that at least one pulse is generated in the photocouplers 9 and 10 at a rotation angle smaller than the rotation angle of the encoder plate 8 caused by this backlash. FIG. 4 shows a block diagram of this device and related circuits. In this figure, 15 is a rotational direction detection circuit, 37 is a photocoupler, 16 and 17 are counting circuits, 18 is a data output obtained, and 19 is a tape speed control circuit. 20 is a brake operation circuit, 21 is a frame advance circuit, 23 is a tape speed detector, and 24 is a click operation circuit. Note that Table 1 shows 5 bits 2
This is an example of data using a hex code.

【table】

[Table] Now, when the operating knob 2 is rotated in the shuttle mode, the pulse signals taken out from the photo couplers 9 and 10 are guided to the counting circuit 16 via the rotation direction detection circuit 15. Then, this pulse signal is transmitted to both of these circuits 1
5 and 16, for example, when the operating knob 2 is rotated clockwise, the data is added, and when the operating knob 2 is rotated counterclockwise, the data is subtracted, resulting in the data output 18.
For example, if the data is a 5-bit binary code, clockwise rotation will add from [00000] to [01111], counterclockwise rotation will subtract from [10000] to [11111], and the operation knob will The data is output as data corresponding to the rotation angle and direction of rotation 2, and is input to the tape speed control circuit 23 on the other hand. Also, for example, if the maximum tape feed speed is 50 times the normal playback speed, the 50x speed data during forward rotation is [01110] and [01111], and the 50x speed data during reverse rotation is [11110] and [11111]. , and the brake operation circuit 20 outputs the data when [01111] and [11111] are input, and the brake magnet 6
is excited and the brake disc 5 is restrained. Therefore, when the data outputs 18 of [01111] and [11111] are received, that is, when the operating knob 2 is rotated to the rotation angle that selects 50x speed, the brake is activated and further rotation is restrained and stopped. become. However, since there is a backlash, or mounting play, between the brake disc 5 and the rotating shaft 1, when the brake disc 5 was being rotated clockwise, it was being rotated counterclockwise. When the tape is rotated clockwise, that is, in the direction of decreasing the tape speed from 50x speed, it is possible to rotate by the amount equivalent to the backlash, and by rotating the tape by the amount equivalent to the backlash, for example, one pulse signal is given, The data becomes [01110] or [11110] from [01111] or [11111], respectively. And this data [01110],
[11110] is a 50x speed command, so
While the tape playback speed remains unchanged, the brake is released and the operating knob 2 can be freely reversed. Then, when the operation knob 2 is moved from the top to the bottom and the photocoupler 37 is switched from the jog mode or normal playback mode to the shuttle mode, or when the power is turned on, the counting circuit 1
By always resetting the data output 18 from 6 to [00000], which is the command for still playback (tape speed 0), the shuttle mode can be set no matter what rotation angle position the operating knob 2 is at. At this point, the stay regenerates immediately, and rotation in both forward and reverse directions centering around the stay.
From that position, you can freely operate within the 50x speed command range. Next, when the operation knob 2 is in the upper position, that is, in the jog mode, the photo couplers 9 and 10 are activated.
The pulse signal extracted from the is inputted to the tape frame feed circuit 21 via the rotation direction detection circuit 15 and the counting circuit 17, so that in the jog mode, for example, the rotation of the operating knob 2 in the clockwise direction corresponds to one pulse. By this, one frame's worth of rotation is performed in the forward reproduction direction, and conversely, by one pulse's worth of rotation in the counterclockwise direction, one frame's worth of advance is performed in the reproduction reverse direction. Since the brake operation circuit 20 is disconnected during this jog mode, the brake operation is not performed and the operation knob 2 can be rotated without limit, thereby allowing unlimited frame advance. In addition, in the shuttle mode, for example, during normal speed playback and still playback, this is detected by the tape speed detector 23 and inputted to the click operation circuit 24, and the brake magnet 6 is momentarily excited to apply force to the rotating shaft 1. Give a click. In this way, the operator can detect a specific tape speed while turning the operating knob 2. In the above embodiment, a photocoupler was used to detect the rotation angle and the position of the operating knob, but the invention is not limited to this.Also, although the embodiment described the case where it is applied to a recording and editing device, other similar methods may also be used. Of course, it can also be applied to other purposes. As described above in detail, according to this invention, two operations, mode switching and tape speed switching, can be performed with one operation knob, and two modes, shuttle and jog, can be performed. Furthermore, in shuttle mode, a strong click can be applied to the rotation of the operating knob at a specific tape speed, and therefore a specific tape speed can be determined, making it extremely easy to operate despite its extremely simple configuration. It is possible to provide a good operating device.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of an embodiment of the operating device according to this invention, FIG. 2 is a cross-sectional view taken from FIG. FIG. 4 is a block diagram showing the circuit configuration of an embodiment of this invention. 1: Rotating shaft, 2: Operation knob, 8: Encoder board, 9, 10... Photo coupler, 19: Tape speed control circuit, 21: Frame feed circuit, 50: Photo coupler, wiring hole for passing brake wiring.

Claims (1)

[Scope of utility model registration request] a rotating shaft; an operating knob provided on the rotating shaft that is slidable in the axial direction and rotates integrally with the shaft in the rotational direction; rotation detection means for detecting the amount and direction of rotation of the rotating shaft; and a brake coupled to the rotating shaft to provide a predetermined backlash,
When the rotary shaft rotates by a predetermined amount, this is detected and the brake is applied to the rotary shaft, and when a reverse rotation is detected at a rotation angle smaller than the backlash angle of the brake, the brake is applied. The rotation detecting means generates a pulse signal proportional to the amount of rotation, and the pulse signal and the click are configured to synchronize with each other. An operating device characterized by: