JPS63205842A - Tape recorder - Google Patents

Abstract

PURPOSE:To detect the presence/absence of the loading of a tape by storing the rotational period in the reproduction operation without loading a tape on the tape recorder, and detecting the rotational period in current status of operation and comparing it with the former. CONSTITUTION:When the tape recorder is set in the reproduction status without loading a tape, the rotational period of a take-up reel is the shortest to store it in a storing means 5. After a mechanism 1 goes to a reproduction status by a mechanism control means 2, a discrimination means 8 is reset, and a counting means 4 is counted up. Then, when the output of a rotation detection means 3 varies due to the rotation of the take-up reel of the mechanism 1, the counting of the means 4 is cleared. Hence, at the time of the following output-variation, a comparing means 6 is in an active status and compares the value of the means 4 with that of the means 5 and if the former is larger than the latter i.e. the former shows a longer period, the reproduction status is continued. On the other hand, if the value of the means 4 is smaller than that of the means 5, a stop instruction is given from a control means 7 to the mechanism control means 2, and the mechanism 1 is terminated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tape recorder having a function of restricting the operation of a mechanism when no tape is attached.

Conventional technology Conventionally, cassette tape recorders have a switch that detects whether a half of a cassette tape is inserted.

Many devices are equipped with levers, etc., and are configured so that the mechanism does not operate when the tape is not attached, in order to reduce wear and power consumption of the mechanism when unnecessary.

Problems to be Solved by the Invention However, in order to realize the above functions, it is necessary to install a detection switch or a detection lever, which increases the cost, and depending on the structure of the mechanism, it is difficult to easily install the switches and levers. In some cases, the structure is such that it cannot be used.

The present invention solves these conventional problems and provides a tape recorder having a function of restricting the operation of the mechanism when no tape is attached without providing a detection switch or lever.

Means for Solving the Problems The tape recorder of the present invention includes a rotation detecting means for detecting the rotation of the take-up reel stand, a counting means for counting the rotation period based on the output of the rotation detecting means, and a tape recorder that includes a rotation detecting means for detecting the rotation of the take-up reel stand, a counting means for counting the rotation period based on the output of the rotation detecting means, and The apparatus includes a storage means for storing the rotation period during reproduction, the counting means, and a comparison means for comparing the values of the storage means.

Effect of the Invention The present invention takes advantage of the fact that the above-described configuration reduces the load on the mechanism when no tape is attached, so that the rotation period of the take-up reel stand becomes faster. The storage means for storing, the rotation detection means, and the counting means detect the rotation period in the current state, and the comparison means detects that the current rotation period is faster than the minimum rotation period during tape playback, and the tape is not loaded. can be detected.

Embodiments Hereinafter, tape recorders according to embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram in one embodiment of the present invention, where 1 is a mechanism, and 2 is a mechanism 1.
3 is a rotation detecting means for detecting the rotation of the tape take-up reel stand of the mechanism 1 and electrically converting the rotation to output the tape take-up reel stand; 4 is a mechanism control means for controlling the operation of the tape take-up reel stand of the mechanism 1; 5 is a storage means for storing the rotation period of the take-up reel stand when the mechanism 1 is playing with no tape attached; 6 is a storage means for comparing the value of the counting means 4 and the value of the storage means 5; Comparison means 7 detects that the value of counting means 4 is less than the value of storage means 5;
8 is a control means for giving commands to the winding p in the reproducing state by the mechanism control means 2 and the rotation detection means 3.
This is a determination means that detects the determination of the rotation period of the IJ-ru table and activates the comparison means.

Figure 2 shows the output waveforms of the rotation detection means 3 in each running mode of the mechanism 1.
is during normal tape playback, C is during minimum tape playback load,
D indicates the time of fast forwarding.

FIG. 3 is a flowchart showing the processing contents of each part of the system shown in the block diagram of FIG. 1.

Figure 2 shows the tape recorder configured as above.
The operation will be explained using FIG.

First, during playback without a tape attached, the rotation period of the take-up reel stand is T1, as shown in Figure 2B, which is clearly shorter than the cycle T2 during normal tape playback, as shown in Figure 2B. Even when compared with the cycle T3 at the minimum load of tape playback shown in FIG. C, it is several minutes lower. Period T when this tape is not attached
A value corresponding to 1 is stored in the storage means 5.

When the mechanism 1 is put into the regeneration state by the mechanism control means 2, the determination means 8 is reset by the processing of steps 31 and 32 shown in FIG.
3. The counting means 4 counts up by the process of 34. Next, the output of the rotation detecting means 3 changes from L to H or from H to L due to the rotation of the take-up reel stand of the mechanism 1'', and in the following explanation, the rise from L to H will be regarded as a period. ), at the time of the first rise, the discriminating means 8 has been reset, so the comparing means 6 is in an inactive state, and step 33.
The determination means 8 is set by the processing in steps 35 to 38, and the third
The count number of the counting means 40 is cleared by the process of step 41 shown in the figure.

Next, at the second and subsequent rises, since the discrimination means 8 is set, the comparison means 6 becomes active, and the value of the counting means 4 in step 39 shown in FIG. A comparison is made with the stored value in the storage means 5. At this time, if the tape is attached, even at the minimum load, as can be seen from the comparison between A and C in FIG. 2, the count number of the counting means 4 is larger than the value of the storage means 5, so step 39 is shown in FIG. The process of .40 only clears the count of the counting means 4, and the reproduction state of the mechanism 1 is continued. On the other hand, when the tape is not attached, the comparison means detects that the count of the counting means 4 is less than the value of the storage means 5, and steps 39 and 41 shown in FIG.
Through the process 42, a stop command is given from the control means 7 to the mechanism control means 2, and the mechanism 1 automatically enters the stopped state.

When the mechanism 1 is in the fast forward mode, the rotation period T4 of the take-up reel stand is shorter than the rotation period T1 when the tape is not attached, as shown in D in FIG. Steps 36-38 shown in Figure 3
As a result of the processing, the discriminating means 8 remains reset,
Since the comparison means 6 does not compare the rotation periods, the state of the mechanism 1 continues.

As described above, according to this embodiment, the storage means 6 stores a value corresponding to the rotation period of the take-up reel stand of the mechanism 1 during playback without a tape attached, and the counting means 4 stores a value corresponding to the rotation period of the take-up reel stand when the tape is not attached. A comparing means 6 is provided to compare the two values, thereby detecting whether the tape is attached or not when the mechanism 1 is in the playback state. By placing the disc in a stopped state, it is possible to prevent the reproduction state from continuing in a state where no tape is attached.

Effects of the Invention As described above, the present invention provides a rotation detecting means for detecting the rotation of the tape winding reel stand, and a counting means for counting the period of the output of the rotation detecting means. A storage means for detecting the rotational period of the take-up reel stand and storing the rotational period at the time of playback with no tape attached, and a comparison means for comparing the value of the storage means with the value of the counting means. By providing a determining means that detects the determination of the rotation period by the output of the rotation detecting means and activates the comparing means, it is possible to determine whether the tape is installed or not in the playback state, and furthermore, upon receiving the output of the comparing means, the mechanism is stopped. By providing a control means for performing such control, it is possible to prevent the continuation of the playback state even when no tape is loaded, without providing a cassette tape no-off detection switch, etc., thereby increasing productivity.

A tape recorder that is excellent in both reliability can be realized.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a tape recorder according to an embodiment of the present invention, FIG. 2 is an output waveform diagram of the rotation detecting means in each running mode of the mechanism, and FIG. 3 is a flowchart showing the processing contents of each part. 1...Mechanism, 2...Mechanism control means, 3...Rotation detection means, 4...
・Counting means, 6... Storage means, 6...
Comparison means, 7... Control means, 8... Discrimination means. Name of agent: Patent attorney Toshio Nakao and 1 other person
3 To figure-

Claims (1)

[Claims] Rotation detecting means for detecting the rotation of the tape take-up reel stand; Counting means for counting the period of rotation based on the output of the rotation detecting means; and storing the rotation period of the take-up reel stand during playback with no tape installed. storage means for determining that the value of the counting means is less than or equal to the value of the storage means; 1. A tape recorder comprising: a determination means for setting the comparison means in an active state; and a control means for controlling a mechanism from a reproduction state to a stop state in response to an output of the comparison means.