JPH01204259A - Tape guide device - Google Patents

Abstract

PURPOSE:To enable the tape traveling guide at the most suitable height in response to the ambient temperature by providing an energizing means for energizing a tape traveling height adjusting screw and a tape guide member, both having large thermosensitive deformable characteristics, toward a head part of the tape traveling height adjusting screw. CONSTITUTION:The tape traveling height adjusting screw 7 is formed out of such a material that its lengthwise variation against the temperature change is particularly large, whereas the height is regulated by the head part 8, while the tape traveling guide member constitutive of top and bottom guide flanges 2 and 3 and a tape guide surface 1 is always energized with a light force toward the head part 8 of the tape traveling height adjusting screw 7. Consequently, a free length of the tape traveling height adjusting screw 7 is changed in response to the temperature change, and the tape traveling guide members 2 and 3 are moved up and down no to give an immoderate force to a tape, thus obtaining a proper step difference between the tape guides in accordance with a variation of rigidity of the tape. By this method, the stable tape travel is feasible over a wide temperature range.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tape guide device used in a rotary head type digital audio tape recorder or the like.

2. Description of the Related Art In recent years, tape guide devices have been required to have higher performance as rotary head type digital audio tape recorders and the like have been put into practical use.

The conventional tape guide device described above will be described below with reference to the drawings.

FIG. 4 is a side view showing a conventional tape guide device in which a plurality of tape guide devices are used with their tape running heights intentionally shifted to obtain a biasing force on the tape in one direction within its plane.
FIG. 4a shows the state at room temperature, and FIG. 4b shows the state at low temperature. In FIG. 4, 1.1' is a tape guide surface, 2 is an upper guide flange, 3.3' is a lower guide flange, 4 is a supporting portion thereof, 6 is a mounting portion for a chassis, etc., and 6 is a tape.

Problems to be Solved by the Invention However, with the above configuration, even if the tape running is adjusted at room temperature and the height of the tape guide section is adjusted to obtain the correct running, it will not work in a low temperature environment. As the tape used hardens and becomes more rigid, the same height difference between the tape guides as at room temperature will cause too much biasing force, causing the tape 6 to bend over the lower guide flange 3 as shown in Fig. 4b.
If the lower edge of the tape 6 is seriously damaged by the lower guide flange 3', the tape will not run correctly and normal recording and playback will not be possible. Ta. Moreover, such problems tend to become more prominent as devices become smaller and the distances between various tape guides become shorter.

In view of the above problems, the present invention provides a tape guide device that can change the tape running height of a tape running position regulating member in response to changes in the rigidity of the tape due to temperature changes.

Means for Solving the Problems In order to solve the above-mentioned problems, the tape guide device of the present invention has a tape running height adjustment screw that has a thermal deformation property larger than that of surrounding components, and a tape running height adjustment screw. a tape guide member having at least one tape edge position regulating portion whose height is regulated by the head of the screw; a biasing means for biasing the tape guide member toward the head of the tape running height adjusting screw; The tape running height adjustment screw is screwed into the supporting portion with an urging means interposed therebetween.

Effect of the present invention With the above-described structure, the free length of the tape running height adjusting screw changes in response to temperature changes, and therefore the tape running guide member moves up and down, thereby increasing the rigidity of the tape without applying excessive force to the tape. An appropriate level difference between the tape guides corresponding to the change can be obtained, and stable tape running can be realized over a wide temperature range.

Embodiment Hereinafter, a tape guide device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a side cross section of a tape guide device in an embodiment of the present invention. Components in FIG. 1 that are common to those in FIG. 4 are designated by the same numbers. Reference numeral 7 denotes a tape running height adjustment screw made of a material that exhibits a particularly large change in length in response to temperature changes. Reference numeral 8 denotes the head of the tape running height adjusting screw, and 9 indicates a compression spring that constantly uses a light force to move the tape running guide section consisting of the upper and lower guide flanges 2.3 and the tape guide surface 1 to the tape running height adjusting screw 7. Force towards head 8.

With this configuration, the tape running height changes in response to temperature changes, so when installed adjacent to a conventional tape guide device, an optimal level difference corresponding to changes in tape rigidity can be obtained. Of course, two or more tapes according to the present invention may be provided adjacently and the tape positions may be displaced approximately in parallel. FIG. 2 is a side view of the tape running height adjusting screw, and FIG. 3 is a graph showing an example of the relationship between temperature changes and changes in the free length of the tape running height adjusting screw.

In the embodiment, the vertical guide 7 flange is formed integrally with the tape guide section and is not rotatable, but it may be rotatable. Alternatively, it is of course possible to use a block that has a roller that rotates between fixed upper and lower guide flanges and is movable up and down.

Also, the free length is below the head of the tape running height adjustment screw,
The reason why the position of the tape running guide member is regulated by the head is to make the free length as large as possible and to obtain a sufficient amount of displacement.

Effects of the Invention As described above, the present invention has a tape running height adjusting screw which has a temperature-sensitive deformation characteristic that is greater than that of surrounding components, and at least one part whose height is regulated by the tape running height adjusting screw head. a tape guide member having two tape edge position regulating parts; a biasing means for biasing the tape guide member toward the head of the tape running height adjusting screw; By providing a support portion that is screwed together, it is possible to guide the tape run at an optimal height depending on the ambient temperature.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of a tape guide device in an embodiment of the present invention, Fig. 2 is a side view of its tape running height adjusting screw, and Fig. 3 is a graph showing the relationship between temperature and free length of the tape running height adjusting screw. FIG. 4 is a graph showing an example of the relationship, and FIG. 4 is a side view showing the operating state of a conventional tape guide device, with FIG. 4a showing one at room temperature and FIG. 4b showing one at low temperature. DESCRIPTION OF SYMBOLS 1... Tape guide surface, 2... Upper guide flange, 3... Lower guide flange, 4... Support part, 6... Tape, 7... ...Tape running height adjustment screw, 8...Head, 9...Compression spring. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
Figure 4 (α) (b)

Claims (2)

[Claims] (1) A tape running height adjustment screw with a temperature-sensitive deformation characteristic larger than that of the surrounding components, and at least one tape edge position regulating part whose height is regulated by the head of the tape running height adjustment screw. a tape guide member, a biasing means for biasing the tape guide member toward the head of the tape running height adjusting screw, and a support portion to which the tape running height adjusting screw is screwed together with the biasing means interposed. A tape guide device comprising: (2) The tape guide device according to claim 1, wherein the tape running height adjusting screw is made of a shape memory alloy having longitudinal deformability.