JPS5837656Y2 - ink ribbon device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in ink ribbon devices used in printing devices.

2. Description of the Related Art Conventionally, an ink ribbon device that supplies an ink ribbon between paper and type in order to print on paper has been used in a printer device as an output device of a terminal of an electronic computing device.

As shown in FIG. 1, this ink ribbon device usually has two reels 1 and 1', between which the ink ribbon 3 is wound close to the paper 2 and is wound from one reel to the other reel. It looks like this.

When the ink ribbon 3 is completely wound onto one reel, the empty reel is then driven to rewind the ink ribbon.

Therefore, both reels 1 and 1' require driving force, respectively, and driving motors 4 and 4' are required for each reel 1 and 1'.
or a switching device such as a clutch is required.

For this reason, the device has the drawbacks of being large and expensive.

The present invention was devised to improve this drawback.

For this reason, the present invention provides an ink ribbon device for winding or rewinding an ink ribbon from one reel to the other reel, in which clutch pawls are formed in the bearing portions of the reels, and the reels are overlapped. The drive shaft is loosely fitted onto the drive shaft, supporting the drive shaft so as to be movable in the direction of the central axis with respect to the reel, and when the drive shaft is moved in one direction on the drive shaft, it meshes with one reel and engages with the other reel. It is characterized in that a claw is formed that engages with the other reel when it moves, and the ink ribbon is wound from one reel to the other reel on the drive shaft, forming a loop in the middle.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 shows the main parts of the ink ribbon device of the present invention.

In the figure, 5 is a frame, and a drive shaft 7 is connected to a bearing 6.
is supported so that it can move up and down.

Ink ribbon reels 8 and 9 are loosely fitted onto this drive shaft 7.

As shown in FIG. 3, clutch pawls 10 are formed on the bearings of the reels 8 and 9, and the drive shaft 7 also has a pawl 11 that meshes with the pawls 10.
is formed.

However, the pawl 11 formed on the drive shaft 7 is 2 as shown in FIG.
reels8. When the drive shaft 7 moves upward, it meshes with the claw of the upper reel 8, and when the drive shaft 7 moves downward, it meshes with the claw of the lower reel 9. It is formed like this.

Further, the drive shaft 7 is connected to a pulley 12 connected to the shaft by a spline mechanism, for example, and connected to the drive motor 1 via a belt 13.
4 so that it can be rotated only in one direction.

The drive shaft 7 is always urged to move downward by a spring 15, but the drive shaft 7 is forced upward by a plunger solenoid or a rotary solenoid 16.
It is pushed up against 5.

Note that reference numeral 17 is a restraining plate that suppresses the reels 8 and 9 from being pushed up when the drive shaft 7 is moved upward, and the hinge pin 1 is used to prevent the reels 8 and 9 from being pushed up when the reel is replaced.
8, and is normally held horizontally by a spring 19.

Further, 20 is a friction material such as felt for creating friction between the reels.

In addition, since the drive shaft 7 rotates and the solenoid 16 does not rotate at the contact point between the solenoid 16 and the drive shaft 7, one of the tips should be made spherical and coated with a semi-solid lubricant to prevent wear. Alternatively, when the reel rotates at high speed, a plurality of rollers 21 may be provided on the solenoid side to support a disc 22 provided on the drive shaft 7, as shown in FIG.

FIG. 5 shows a perspective view of the ink ribbon device of the present invention, in which 23 and 24 are guide rollers for the ink ribbon 3, 25 is a tension roller for absorbing slack during running of the ink ribbon 30 or when switching the clutch; 26 and 27 are sensors for detecting the end of the ink ribbon, and as shown in FIG. 6, a slit 28 is provided, through which the ink ribbon 3 is passed, and a protrusion formed at the end thereof is detected. It looks like this.

The operation of the ink ribbon device configured as described above will be described next.

First, the ink ribbon 3 is wound from one reel to the other reel via the sensors 26, 27 and the guide rolls 23, 24, and the drive motor 14 is rotated.

As a result, when the drive shaft 7 rotates in the direction of the arrow X, the drive shaft 7 engages with the lower girdle 9 and rotates it, thereby winding up the ink ribbon 3 while traveling in the direction of the arrow P.

When the ink ribbon 3 reaches the end, the protrusion formed there hits the slit 28 (see FIG. 6) of the sensor 27 and informs that the ink ribbon has reached the end.

The sensor 27 thereby gives an instruction to the solenoid 16 to operate.

When the solenoid 16 operates, the drive shaft 7 is pushed upward, stopping driving of the lower reel 9 and driving the upper reel 8.

As a result, the reel 8 rotates in the direction of arrow X and winds up the ink ribbon 3 while traveling in the direction of arrow Q.

When the ink ribbon 3 wound around the reel 9 reaches the end, the projection formed there is detected by the sensor 26, and the operation of the solenoid 16 is restored.

As a result, the drive shaft 7 is moved downward by the spring 15, releases its engagement with the upper reel 8, engages with the lower reel 9, and returns to its original state.

In this way, while the drive motor 14 is rotating, the ink ribbon repeatedly moves back and forth.

Note that since the reel winding up the ink ribbon and the other reel always rotate in opposite directions, a certain amount of tension is applied to the running ink ribbon 3 by the friction material 20 provided between the two reels.

Incidentally, when the end of the ribbon 3 is detected by the sensor 26 or 27, the drive shaft 7 may be operated by the solenoid 16, and the rotation direction of the drive motor 14 may be reversed.

As explained above, the ink ribbon device of the present invention can wind and unwind the ink ribbon using a single drive shaft, so the structure is simple and it can be manufactured in a small size and at low cost. It is.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of an example of a conventional ink ribbon device;
Fig. 2 is a sectional view of the main parts of the ink ribbon device according to the embodiment of the present invention, Fig. 3 is a schematic illustration of the reel and the claws of the drive shaft, and Fig. 4 is an example of the vertical drive portion of the drive shaft. 5 is a perspective view of an ink ribbon device according to an embodiment of the present invention, and FIG. 6 is a partially enlarged perspective view of a sensor at the end of the ink ribbon. 3... Ink ribbon, 7... Drive shaft,
8, 9...Reel, 10.11...Clutch pawl.

Claims (1)

[Scope of utility model registration request] An ink ribbon device that winds or rewinds an ink ribbon from one reel to the other reel, in which clutch pawls are formed on the bearing portions of the reels, and the reels are overlapped and loosely fitted onto a drive shaft. , the drive shaft is supported movably in the central axis direction with respect to the reel, and when the drive shaft is moved in one direction on the drive shaft, it engages with one reel, and when it is moved in the other direction, it engages with the other reel. An ink ribbon device characterized in that interlocking pawls are formed, the ink ribbon is wound from one reel to the other reel on the drive shaft, and a loop is formed in the middle.