JPH0381221B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a transfer device that can be used in recording and reproducing devices and the like.

Conventional configurations and their problems In recent years, the amount of information handled by recording and reproducing devices has increased dramatically, and recording densities have become higher. Therefore, high accuracy is also required for recording and reproducing devices. In particular, pick-up transfer devices that directly exchange information are required to have high positioning accuracy.

A conventional transfer device will be described below with reference to the drawings. FIG. 1 is a perspective view of a conventional transfer device. Reference numeral 10 denotes a pickup for exchanging information, such as a magnetic head. 12
is a carriage guided by guide members 14, 16 arranged parallel to each other. Reference numeral 18 denotes a bearing, which has an outer diameter several mm larger than the diameter of the guide member 14 and an inner diameter generally about 10 μm larger, and whose central axis is on the same line at the position where the guide members 14 at both ends of the carriage 12 pass through. I'm obsessed with it. Reference numerals 20 and 22 denote guide ears, which are arranged at an interval slightly larger than the diameter of the guide member 16, and by passing the guide member 16 between them, the carriage 12 rotates around the guide member 14. is prevented.

In the above configuration, when the carriage 12 is moved, it is driven along the guide members 14 and 16 using a suitable drive device (stepping motor, voice coil motor, etc.). However, in the above configuration, the bearing 18
A gap is created between the guide member 14 and the guide member 14, and a backlash corresponding to the size of the gap is generated, which affects positioning accuracy. In addition, the bearing 18 and the guide member 1
4 slides, which causes sliding friction and increases the load required to move the carriage 12.

OBJECT OF THE INVENTION An object of the present invention is to provide a transfer device that has a small load during movement and is free from backlash.

Configuration of the Invention In order to achieve the above object, the transfer device of the present invention includes a plurality of cylindrical pulleys supported by rotating shafts parallel to each other, a plate-shaped belt wound around each of the pulleys, The movable member is in contact with the pulley around which the belt is wound, and both ends of the belt are fixed, and a surface of the movable member opposite to the pulley is applied to apply lateral pressure to the movable member. This structure has a lateral pressure adding member, which reduces backlash during sliding and reduces the load due to rolling friction.

Further, the present invention provides a plurality of cylindrical pulleys supported by mutually parallel rotating shafts, a plate-shaped belt wound around any of the pulleys, a pulley around which the belt is wound, and A movable member that contacts another pulley at the same time and has both ends of the belt fixed; and a lateral pressure applying member that contacts a surface of the movable member opposite to the pulley and applies lateral pressure to the movable member. Because of this structure, it is easy to assemble, there is no sliding play, and the load is smaller.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a perspective view of a transfer device in one embodiment of the present invention. 24 is a transfer member;
A portion thereof has a pick-up 26 such as a magnetic head. 28 and 30 are cylindrical pulleys,
Mutually parallel rotation shafts 3 erected on the substrate 36
2 and 34, respectively, and are rotatably supported at the same height. Reference numeral 38 denotes a single thin metal belt member, which is wound around the pulleys 28 and 30 in an α shape. In other words, the belt member 38 wound in an α-shape is connected to the pulleys 28 and 30 at approximately one quarter of the distance from both ends of the stop plate member 4.
0 through screws 42. Further, the belt member 38 is given an appropriate tension, its both ends are fixed to both ends of the one surface 60 of the transfer member 24 by screws 43, and its center portion is fixed to the one surface 60 of the transfer member 24.
0, the belt member 38 and the transfer member 24
It is fixed with a set screw 46 via a fixing plate 44 so that there is no gap between the two.

A side pressure applying roller 48 is brought into contact with the other surface 62 of the transfer member 24, and is rotatably supported by a roller shaft 52 attached to a holder 50. Further, the holder 50 is rotatably supported by a holder shaft 54 erected on the substrate 36, and is attached to an elastic member 56 that is attached to the holder shaft 54 and has both ends engaged with the holder 50 and a spring stopper 58. Therefore, the holder 50 is biased in the direction of arrow A and applies lateral pressure to the transfer member 24. Therefore, the side pressure applying roller 48 rotates while contacting the other surface 62 of the transfer member 24.

The operation of the transfer device of this embodiment in the above configuration will be explained. By the side pressure applying roller 48,
transfer member 24, belt member 38, and pulley 28,
30 are in contact with each other. Further, since the belt member 38 is stretched without slack, the pulleys 28, 30 rotate by an angle corresponding to the length of movement of the transfer member 24, and no slippage occurs between them. Furthermore, since the transfer member 24 is supported in the axial direction of the pulleys 28 and 30 by the rigidity of the belt member 38, no rattling or slipping occurs. Therefore,
Transfer member 24 moves smoothly in a common tangential direction of pulleys 28,30.

Next, another embodiment of the present invention will be described with reference to FIG. A belt member 64 is wound around one pulley 28, and both ends of the belt member 64 are fixed to one surface 60 of the transfer member 24 by screws 43. Other structures are similar to the above embodiments. According to this embodiment, the axial rigidity of the pulleys 28 and 30 is weaker than in the above embodiment, but the belt member 64 only needs to be wound around one pulley 28, and the structure is simple and assembly is easy. It also becomes easier.

Effects of the Invention As described above, the present invention provides a plurality of cylindrical pulleys supported by rotating shafts parallel to each other, a plate-shaped belt wound around each of the pulleys, and a pulley around which the belt is wound. , and has a moving member to which both ends of the belt are fixed, and a lateral pressure applying member that comes into contact with a surface of the moving member opposite to the pulley and applies lateral pressure to the moving member. Compared to sliding bearings, there is less backlash and sliding friction, and compared to linear bearings, the cost is much lower, which improves positioning accuracy.
It can be moved by a drive device with low output.

Furthermore, a plurality of cylindrical pulleys supported by rotating shafts parallel to each other, a plate-shaped belt wound around any of the pulleys, and a pulley around the belt and other pulleys are provided. A structure including a movable member that contacts simultaneously and to which both ends of the belt are fixed, and a lateral pressure applying member that contacts a surface of the movable member opposite to the pulley and applies lateral pressure to the movable member. This makes it possible to realize a transfer device that has a simpler structure and is easier to assemble.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a conventional transfer device, FIG. 2 is a perspective view of an embodiment of the transfer device of the present invention, and FIG.
The figure is a perspective view showing another embodiment of the transfer device of the present invention. 24... Transfer member, 28, 30... Pulley, 3
2, 34... Rotating shaft, 36... Board, 38... Belt member, 40... Stopping plate member, 42, 43... Screw, 44
...Fixing plate, 46... Set screw, 48... Side pressure applying roller, 50... Holder, 52... Roller shaft, 54... Holder shaft, 56... Elastic member, 64... Belt member.

Claims (1)

[Scope of Claims] 1. A plurality of cylindrical pulleys supported by rotating shafts parallel to each other, a plate-shaped belt wound around each of the pulleys, and the pulley around which the belt is wound. A transfer device comprising: a moving member that is in contact with the belt and to which both ends of the belt are fixed; and a lateral pressure applying member that is in contact with a surface of the moving member opposite to the pulley and applies lateral pressure to the moving member. 2 A plurality of cylindrical pulleys supported by mutually parallel rotating shafts, a plate-shaped belt wound around any of the pulleys, and a pulley around which the belt is wound and another pulley at the same time. A transfer device comprising: a movable member that is in contact with the belt and to which both ends of the belt are fixed; and a lateral pressure applying member that is in contact with a surface of the movable member opposite to the pulley and applies lateral pressure to the movable member.