JPS5829158A - Tape counter - Google Patents

Abstract

PURPOSE:To attain interchangeability of components and to reduce the number of components, by commonly using a pulse generating mechanism itself. CONSTITUTION:A bearing cylinder 5 is incorporatedly formed at one corner of a frame bottom plate 2 and a rotary shaft 7 penetrates freely rotatably into its center hole 6. A pulley 8 is fixed at the lower part of this rotary shaft 7 projected from the lower end of the bearing cylinder 5. A worm 9 and a magnet 10 are respectively provided at the upper part of the rotary shaft 7 projected from the upper end of the bearing cylinder 5. The magnet 10 is entirely shaped as a ring and the circumference of the magnet 10 is alternately provided with N and S poles as magntiziing processing. The magnet 10 is pressed in the rotary shaft 7 so that the magnet 10 is opposed to and contacted with a top surface 5b of the bearing cylinder 5 via a plastic washer 5a.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape counter that is attached to a tape recorder and is equipped with a pulse generation mechanism that cumulatively displays the running distance of the tape and sends out a tape running signal.

A tape counter with a pulse generating mechanism generates a pulse as the tape is running, and this sending pulse causes a light emitting diode to blink to indicate the tape running state or to detect the end of the tape. The pulse generation mechanism is described, for example, in Jikkin No. 55-8916 “Hall I
As disclosed in ``Mounting Structure of C'', there is a N-pole and
A disk-shaped magnet consisting of 8 poles magnetized in succession is assembled to the boss of the pulley, and in order to arrange the Hall IC element in close proximity to this magnet, this hole I
The printed circuit board carrying the C element was assembled into an L-shaped bracket, and this bracket was attached to the frame. Incidentally, various types of tape counters are required in which the mounting position of the pulley 13 or the shape of the pulley differs depending on the specifications of the tape recorder to which the tape counter is attached. In a normal tape counter, this can be handled by replacing the rotating shaft and pulley, but in a tape counter equipped with a pulse generation mechanism, the printed circuit board or bracket must be designed new each time. Ta. In addition, in order to send pulses accurately as the tape runs, not only the alignment of the pole IC element and the magnet surface, but also the setting of the interval requires a certain degree of precision.
In the conventional tape counter described above, since the Hall IC element and the magnet are determined by the relative positional relationship of various members such as the rotating shaft, pulley, printed circuit board, and bracket, dimensional accuracy of each member is of course required. An adjustment process after assembly was also essential.

In view of these circumstances, the present invention provides a tape counter in which the pulse generating mechanism itself can be used in common regardless of the mounting position of the pulley, thereby ensuring interchangeability of parts. An advantage of the present invention is to provide a tape counter that can share its frame even with tape counters not equipped with a pulse generation mechanism. The present invention further provides a tape counter that has a reduced number of parts compared to conventional tape counters and eliminates the need for post-assembly adjustments. A tape counter according to the present invention that has achieved such an object fixes a magnet to the rotating shaft with reference to the end face of a bearing sleeve that supports the rotating shaft,
A magnetically sensitive element is disposed close to the magnet, and a support part for supporting a printed circuit board on which the magnetically sensitive element is mounted is integrally formed in the counter frame in correspondence with the magnet. It is something.

Hereinafter, the present invention will be explained in detail 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 figures, 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 on one of the frame bottom plates 2,
A rotating shaft 7 rotatably passes through the center hole 6.

A boot 18 is fixed to the lower part of the rotary shaft 7 protruding from the lower end of the bearing sleeve 5, and a belt (not shown) is attached to the pulley 8 to receive rotation from the tape drive source.

Further, a worm 9 and a magnet 10 are respectively fixed to the upper part of the rotating shaft 7 protruding from the upper end of the bearing sleeve 5.

The magnet 10 has a ring shape as a whole, and is magnetized so that N poles and eight poles are arranged alternately on the circumferential surface. This magnet 10 is press-fitted onto the rotating shaft 1 through a plastic washer 5m so as to be in contact with the top surface 5b of the bearing sleeve 5. That is, the magnet 10 is press-fitted and fixed to the rotating shaft 7 using the upper end surface 5b of the bearing sleeve 5 as a reference plane. A printed flower board support section 11 consisting of a pair of vertical walls is integrally provided on one side of the frame bottom plate 2 in the vicinity of the bearing tube 5 . These vertical walls face each other parallel to each other, and have through holes 12 formed in their opposing sides so that their axes coincide with each other, and dowels (not shown) are provided on their inner surfaces. Reference numeral 13 designates a printed circuit board whose details are shown in FIG. 3. After terminal conductors are printed on the surface of the printed circuit board, a Hall IC element 14 is chip-bonded, and this is covered with a ceramic cap. The printed circuit board 13 has a thickness that is slightly larger than the opposing distance between the vertical walls of the support section 11, and a through hole 15 and a dowel that correspond to the through hole 12 of the support section and are spaced apart from each other on the side opposite to the Hall IC element 14. A corresponding small hole 16 is provided, respectively. therefore,
The printed circuit board 13 is inserted between the vertical walls, positioned by the small holes 16 and the dowels, and then fixed to the support portion 11 by the squeeze pins 17 fitted in the through holes 12 and 13. At this time, the Hall IC element 14 mounted on the printed circuit board 13 is located close to the surface of the magnet 10.

18 is a number wheel support shaft supported between the side plates 3 and 4, 19 is a worm wheel rotatably mounted on this support shaft, and its small diameter gear meshes with the worm 9 and receives its rotation. . 20. Numeral wheels 21 and 22 are rotatably mounted on the support shaft 18 adjacent to the worm wheel 19, and 23 is a zero return rotatably supported by a bearing 24 erected on the frame bottom plate 2. A bracket member 25 is a pinion support shaft supported by this member, and 26 is rotatably mounted on this support shaft and meshes with the large diameter gear of the worm wheel 19 and the gear of the number wheel 20 to transmit their rotation. 27.28 is a shift binion that is interposed between each number wheel 20, 21, and 22 to perform shift transmission. 29 urges the zero return bracket member 28 in the counterclockwise direction in FIG. 1, and the worm wheel 111. Each number wheel 2G, 21.
22 and the transmission gear pinion 27, 28, 80 is a push button member assembled into the guide groove 31 provided in the frame side plate 3, and the pinion support 80 is attached to the negative side of the push button member. A cam 32 that engages with the end of the shaft 25 is provided in a protruding manner.

When the tape recorder is operated, the pulley 8 rotates, and the worm 9 rotates via the rotating shaft 7. The rotation of the worm 3 is transmitted to the worm wheel 19, and the transmission pinion 2
6, the number wheel 20 is driven. When the number wheel 20 is driven one revolution, the number wheel 2
1 rotates one step at a time, and this operation is repeated one after another, and the amount of tape travel is cumulatively displayed on the number wheels 20, 21, and 22.

Further, when the push button 30 is depressed, 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, while the zero return bracket member The heart cam pressing piece 23 presses the heart cam of each number wheel, thereby returning the number wheel to zero.

As described above, in the tape counter of the embodiment, the magnet 10 is press-fitted and fixed onto the rotating shaft 1, and the Hall IC element 14 is disposed close to the magnet 10. Therefore, as the rotating shaft 1 rotates, the magnet 10 also rotates. They rotate together to drive the Hall IC element 14 and generate pulses.

Incidentally, in the tape counter, the position or shape of the pulley 8 must be changed in various ways depending on the specifications of the tape recorder to which the tape counter is attached. However, as described above, the magnet 10 is press-fitted onto the rotating shaft 7# with reference to the upper end surface 5b of the bearing cylinder 5, and the printed circuit board 1s on which the Hall IC element 14 is mounted corresponds to the magnet 10. is attached to the frame 1, so even if the length of the rotating shaft 1 changes, or if the pulley 8 is installed in a different position or shape,
These magnets10. Printed circuit board 11, Hall IC
Chain members such as element 14 do not require any modification.

FIG. 4 is an exploded perspective view showing main parts of another embodiment of the tape counter according to the present invention, in which the same members or equivalent parts as in the first embodiment are given the same reference numerals, and the structure thereof is shown in FIG. Also, the explanation of the operation will be omitted.

In this second embodiment, the magnet 10 is press-fitted onto the rotating shaft 7 and positioned between the bearing sleeve 5 and the pulley 8, using the lower end surface 5C of the bearing sleeve 5 as a reference plane. The printed circuit board 13 is assembled so as to be bonded to the lower surface of the frame bottom plate 2. For this reason, the printed circuit board 13
A semicircular notch 1 that fits into the circumferential surface of the bearing cylinder 5 is provided at the side end of the bearing cylinder 5.
3' is provided, and a through hole 15 is provided corresponding to the mounting hole 2' used when attaching the counter to the tape recorder. Therefore, by tightening the machine screws 33 inserted into the through holes 15 and the mounting holes 2', the printed circuit board 13 is fixed to the frame 1, and the Hall IC element 14 mounted on this printed circuit board 13 is brought close to the surface of the magnet 10. It is located there.

As explained in detail above, according to the present invention, even if the specification of the mounting position of the pulley with respect to the rotating shaft changes, the position of the magnet fixed on the rotating shaft with reference to the end face of the bearing sleeve does not change. There is no need to design and manufacture a new pulse generation mechanism each time, and the compatibility of the mechanism can be ensured. In addition, since the positions of the magnet and Hall IC element are set based on the end face of the bearing sleeve, they can be determined extremely accurately, which does not require any skill in assembly. No adjustments are required. Furthermore, since the conventional placket for supporting the printed circuit board is not required, the number of parts can be reduced, and the uneconomical cost of preparing brackets with multiple shapes and nine dimensions can be eliminated. Furthermore, according to the present invention, the pulse generation mechanism is extremely compact and the counter space is effectively utilized, so that it has the advantage of being able to be made into a shed.

[Brief explanation of drawings]

FIG. 1 is a perspective view of one embodiment of the tape counter according to the present invention, FIG. 2 is a side view of the same, FIG. 3 is a perspective view of a printed circuit board, and FIG. 4 is another embodiment of the main part. It is a perspective view of the parts disassembled and shown from the bottom side. 1. Fist...Frame, 2... Bottom plate, 3, 4...
・Side plate, 5...Φ bearing cylinder, 5b, --... Upper end surface, 5c
...lower end surface, 7...rotation shaft, 8@...pulley, S...-worm, 10...magnet, 11
11... Support part, 13... Fist printed circuit board, 14.
... Hall IC element, 19 ... Worm wheel, 20.21.22*, 6-number wheel, 23 ... Zero return bracket member, 26 ... Transmission pinion, 27゜2811 digit feed Shipinion, 30-...Push button member. Patent applicant Tamura Electric Co., Ltd. Agent Masaki Yamakawa (and one other person) Figure 2 Figure 4

Claims (2)

[Claims] (1) A bearing sleeve integrally formed in a part of the frame, a rotary shaft rotatably supported with both ends protruding beyond the bearing sleeve, and a worm provided at each of the protruding ends of the rotary shaft. and a pulley, characterized in that a magnet is assembled on the rotating shaft as an end face reference of the bearing sleeve, and a magnetically sensitive element is disposed close to the magnet. (2) A bearing sleeve integrally formed in a part of the frame, a rotary shaft rotatably supported with both ends protruding from the bearing sleeve, and a rotary shaft provided at each protruding end of the rotary shaft. In a tape counter equipped with a worm and a pulley, a magnet is assembled on the rotating shaft with the end face of the bearing sleeve as a reference, and a magnetically sensitive element is mounted on a support portion integrally formed in a part of the frame in proximity to the magnet. A tape counter featuring a mounted printed circuit board.