JPS647411B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape counter that is attached to a tape recorder and displays the cumulative amount of tape travel, etc.
More specifically, the present invention relates to an improvement in a tape counter having a function of sending out tape running pulses.

Some tape counters are equipped with a so-called pulse generation mechanism that generates pulses as the tape runs.The sent pulses cause a light emitting diode to blink to display the tape running status, or to indicate the end of the tape. It is being detected. Conventional tape counters are constructed by assembling a disk-shaped magnet with alternatingly different magnetic poles on its circumference around the boss of a pulley, as shown in Utility Model Publication No. 55-8916 ``Hall IC Mounting Structure''. A magnetically sensitive element such as a Hall IC was placed close to the magnet.
The Hall IC element was mounted on a printed circuit board, and this printed circuit board was further supported on a bracket that was screwed to the lower surface of the bottom plate of the counter frame. By the way, the position of the pulley of a tape counter can be changed as appropriate depending on the specifications of the tape recorder to which it is attached, so the position of the magnet also changes, and from this, of course, the shape of the printed circuit board changes.
Brackets also had to be prepared to meet the specifications each time.

In other words, in conventional tape counters with pulse generation mechanisms, even if the basic configuration of each component is the same, the printed circuit board or bracket must be designed and manufactured each time depending on the mounting position of the pulley. However, the compatibility was poor.

In view of these circumstances, the present invention provides a tape counter in which the constituent members of the pulse generating mechanism are common and the parts are interchangeable regardless of the mounting position of the pulley. Further, the present invention allows the counter frame to be shared regardless of whether or not there is a pulse generation mechanism, and when used in a device with a pulse generation mechanism, assembly is extremely simple and adjustment after assembly is not required. It provides a tape counter. The tape counter according to the present invention, which has achieved the above object, has a worm molded from a synthetic resin material mixed with magnetic powder, has different magnetic poles alternately magnetized on its circumferential surface, and further has a worm that is close to the worm. A magnetically sensitive element is disposed in the counter frame, and a support portion for attaching a printed circuit board on which the magnetically sensitive element is mounted is integrally formed on the counter frame adjacent to the worm.

The present invention will be explained in detail below with reference to embodiments shown in the drawings.

FIG. 1 is an exploded perspective view of the tape counter of the embodiment, and FIG. 2 is a side view of the same. In the figure, reference numeral 1 denotes a frame having an upwardly U-shaped cross section and consisting of a bottom plate 2 and side plates 3 and 4. A bearing tube 5 is integrally formed in one pair of the frame bottom plate 2, and a rotating shaft 7 is rotatably inserted into the center hole 6 of the bearing tube 5. A pulley 8 is fixed to the lower end of the rotating shaft 7, and a belt (not shown) is engaged with the pulley 8 to receive rotation from the tape drive source. Further, a worm 9 is fixed to the upper end of the rotating shaft 7. The worm 9 is molded from a synthetic resin material, and magnetic powder is mixed into the synthetic resin material. And this warm 9
After being molded, a magnetization process is performed on the circumferential surface thereof so that north poles and south poles are alternately continuous in the circumferential direction.
By the way, a printed circuit board support portion 10 is integrally formed on the frame bottom plate 2 adjacent to the bearing cylinder 5. This printed circuit board support part 10 is made up of a pair of vertical walls parallel to the longitudinal direction of the frame, and is provided with a through hole 11 whose axes coincide with each other, and a dowel (not shown) is provided protruding inside the vertical wall. .
12 is a printed circuit board with an inverted L-shaped outline;
The details are illustrated in FIG. This printed circuit board 12 has a thickness slightly larger than the distance between the vertical walls of the support section 10, and has holes on its surface.
An IC element 13 is mounted and a terminal conductor 14 is printed. In addition, the Hall IC element 13
is chip-bonded directly onto the terminal conductor previously printed on the surface of the printed circuit board, and covered with a ceramic cap. The printed circuit board 12 also has a through hole 11 in the support section 10.
A through hole 15 is formed corresponding to the hole 15, and a small hole 16 is formed near the through hole 15 corresponding to the dowel of the vertical wall. The printed circuit board 12 configured in this manner is fixed by a rear pin 17 inserted into the support portion 10 so that the through hole 15 is aligned with the through hole 11 . At this time, the printed circuit board 12 is positioned by fitting the small hole 16 and the dowel, and movement during the clamping operation is prevented.

Note that the other structural members are exactly the same as those of the conventional tape counter, so the details of the structure will be omitted.
A number wheel support shaft 19 supported between them is a worm wheel rotatably mounted on this support shaft, and its small diameter gear meshes with the worm 9 to receive rotation transmission. 20, 21, 22 are worm wheels 19
A number wheel 23 is rotatably mounted on the support shaft 18 adjacent to the bearing 24 erected on the frame bottom plate 2.
a zero return bracket member rotatably supported by the
25 is a pinion support shaft supported by this member; 26
A transmission pinion 27, 2 is rotatably mounted on the support shaft and meshes between the large-diameter gear of the worm wheel 19 and the gear of the number wheel 20 to transmit the rotation thereof.
Reference numeral 8 denotes a shift pinion which is interposed between each number wheel 20, 21, 22 and performs shift transmission. 29 urges the zero return bracket member 23 in the counterclockwise direction in FIG.
1, 22, transmission pinion 26, shift pinion 2
Reference numeral 30, which is a torsion spring that maintains meshing with 7 and 28, is a push button member that is assembled into a guide groove 31 provided in the frame side plate 3. A matching cam 32 is provided.

When the tape recorder is connected, the pulley 8 rotates, and the worm 9 also rotates via the rotating shaft 7. The rotation of the worm wheel 9 is transmitted to the worm wheel 19, and the number wheel 20 is transmitted via the transmission pinion 26.
is driven. When the number wheel 20 is driven one rotation, the number wheel 21 is rotated one step through the digit feed pinion 27, and this operation is repeated one after another, and the running distance of the tape is displayed on the number wheels 20, 21, 22. The total is displayed. Also, if the push button 30 is pressed,
The zero return bracket member 23 is rotated by the engagement between the cam 32 and the pinion support shaft 25, and the engagement between the number wheel etc. and the pinion is released. The heart cam of the car is pressed, which causes the number wheel to return to zero.

As mentioned above, in the tape counter of the embodiment, the worm 9 is molded from a synthetic resin material mixed with magnetic powder, and the N pole and S pole are continuously and alternately magnetized along the circumferential direction of the worm. This warm 9
Since the Hall IC element 13 is placed close to
As the worm 9 rotates, the Hall IC element 1
3 is driven, and pulses are generated from this. Generally, in a tape counter, the position or shape of the pulley 8 is changed in various ways depending on the specifications of the tape recorder to which the tape counter is attached. Even if various rotation shafts 7 or pulleys 8 are selected, the position of the worm 9 does not change, and the Hall IC element 13 and the printed circuit board 12 are driven by the worm 9.
does not require any changes. That is, even if the specifications of the rotating shaft 7 or the pulley 8 are changed in various ways, the specifications of the worm 9, printed circuit board 12, Hall IC element 13, etc. that constitute the pulse generation mechanism do not need to be changed at all.

In the above embodiment, the rotating shaft 7 and the worm 9 are constructed as separate members, but they may be integrally formed of a synthetic resin material mixed with magnetic powder. Further, the circumferential surface of the worm 9 is continuously magnetized with N and S poles, and the printed circuit board support portion 10 is provided on the frame bottom plate 2 so as to be close to this circumferential surface. North pole/S direction
A printed circuit board support portion may be formed on a counter cover or the like by continuously magnetizing the poles.

As explained in detail above, according to the present invention, even if the specification of the pulley mounting position changes, the position of the magnet does not change, so there is no need to design a new pulse generation mechanism each time, and the compatibility of the same mechanism is improved. is measured. Furthermore, since the positions of the worm and the Hall IC element are set with reference to the frame, they can be held extremely accurately, and not only does assembly require no skill, but also no adjustment is required after assembly. Furthermore, there is no need for a bracket for mounting a printed circuit board as in the past, and there is no need to prepare brackets of various shapes and sizes. Furthermore, since the printed circuit board equipped with the Hall IC element is installed using the dead space around the worm, the space can be used effectively, and in other words, the counter can be made smaller. The present invention provides various effects, including compatibility with ordinary tape counters that do not have a pulse generation mechanism.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing one embodiment of a tape counter according to the present invention, FIG. 2 is a side view of the same, and FIG. 3 is a perspective view of a printed circuit board. DESCRIPTION OF SYMBOLS 1... Frame, 2... Bottom plate, 3, 4... Side plate, 5... Bearing tube, 7... Rotating shaft, 8... Pulley, 9... Worm, 10... Support part, 11...
Through hole, 12...printed circuit board, 13...hole
IC element, 15...Through hole, 17...Memory pin, 1
9... Worm wheel, 20, 21, 22...
Number wheel, 23... Zero return bracket member, 26...
...transmission pinion, 27, 28... shift pinion, 30... push button member.

Claims (1)

[Claims] 1. In a tape counter that is attached to a tape recorder and displays the running amount of the tape, etc., the worm fixed to one end of the rotating shaft is made of a synthetic resin material mixed with magnetic powder, and the worm is made of a synthetic resin material mixed with magnetic powder. A tape counter characterized in that different magnetic poles are alternately magnetized on the circumferential surface of the worm, and a magnetic sensing element is disposed close to the worm. 2. In a tape counter that is attached to a tape recorder and displays the running distance of the tape, the worm fixed to one end of the rotating shaft is molded from a synthetic resin material mixed with magnetic powder and has different magnetic poles alternately arranged on its circumferential surface. A tape counter characterized in that the worm is magnetized, and the counter frame is integrally formed with a support part on which a printed circuit board equipped with a magnetically sensitive element is mounted adjacent to the worm.