JPS591809Y2 - Ink ribbon feed mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ink ribbon feed mechanism that feeds an ink ribbon while tilting it at a predetermined angle with respect to a printing line.

In a printer using a relatively narrow ink ribbon, the ink ribbon is fed while being inclined at a predetermined angle with respect to the printing line in order to efficiently use the entire width of the ink ribbon.

For this reason, in the conventional ink ribbon feed mechanism, all mechanisms including the ink ribbon and motor must be installed obliquely with respect to the printing line.

For this reason, it is necessary to use a dedicated motor or to use a flexible joint such as a coil spring rather than a shared drive source, and in the former case, the mechanism becomes large and expensive.

The latter is not suitable for large torques and has the drawback of requiring time and effort to adjust the inner diameter of the coil.

Therefore, an object of the present invention is to provide an ink ribbon feed mechanism that is driven using a drive source such as a printing mechanism without using a dedicated motor or a flexible joint.

To simplify the explanation, the dot line printer shown in FIGS. 1a and 1b will be used in the following explanation.

That is, FIGS. 1a and 1b are a plan view and a side view of a dot line printer equipped with an embodiment of the ink ribbon feed mechanism according to the present invention, and FIG. 2 is a diagram showing an example of the ink ribbon feed mechanism according to the present invention. It is a sectional view showing an example.

In the figure, 1 is a motor used as a drive source for swinging a shuttleper 4, which will be described later, and also used as a drive source for feeding an ink ribbon, 1a is a rotating shaft of this motor 1, and 1b is a rotating shaft 1a. Wheel fixed to I
C is a belt that transmits the rotation of this wheel 1b, 2a is a flywheel that is driven by this belt IC and rotates,
2b is an eccentric cam connected to the shaft 2C of this flywheel 2a, 2b is a pulley fixed to this shaft 2C, 2e is a belt that transmits the rotation of this pulley 2d, and 3 is this belt 2.
4 is a shuttle lever that is swung by the eccentric cam 2b, 5 is a large number of dot printing elements mounted on the shuttle lever 4, and 6 is a driven pulley (not shown) that is driven by the shuttle lever 4. As shown in FIG. 2, the sheet feeder 7, which feeds sheets in a direction perpendicular to the swinging direction, has the driven pulley 3 rotatably attached to the lower frame 8, and the drive shaft 9 is rotated at a predetermined angle via a bearing 7a. A pulley bracket 10 supports the drive shaft 9 diagonally, a driven pin 11 is fixed to the driven pulley 3, and the driven pin 10 is fixed to the driven pulley 3.
12 is a sliding bearing fixed to a ribbon feed roller 14, which will be described later, and 13 is a shaft 13a. The upper frame is tilted with respect to the frame 8 by the predetermined angle and prevents the drive shaft 9 from falling downward and supports the drive shaft 9 obliquely by the predetermined angle.

14 is a ribbon feed roller connected to the drive shaft 9 via a one-way clutch 15, and whose outer peripheral surface is coated with a high-friction material such as rubber; 16 is an ink ribbon as shown in FIG. 1; and 17 is an ink feed roller. A pressure roller 18 is used to press the ribbon 16 against the ribbon feed roller 14, and a ribbon cartridge 18 is used to fold and store the ink ribbon 16.

Next, the operation of the ink ribbon feed mechanism according to the above configuration will be explained.

First, when the rotating shaft 1a of the motor 1 rotates, the wheel 1
The flywheel 2a, eccentric cam 2b, and pulley 2d rotate via the belt 1C and the belt 1C.

The rotation of the pulley 2d further rotates the driven pulley 3 via the belt 2e.

Therefore, the drive shaft 9 is rotated by the drive pin 11 attached to the driven pulley 3 via the driven pin 10.

Then, the ribbon feed roller 14 rotates via the one-way clutch 15.

Since the ink ribbon 16 is held between the ribbon feed roller 14 and the pressure roller 17, the ink ribbon 16 is fed by the rotation of the ribbon feed roller 14.

Note that if there is at least one drive pin 11, it is possible to rotate the drive shaft 9 in one direction via the driven pin 10, but by sandwiching the driven pin 10 with two drive pins, play can be prevented. Motor 1
The ink ribbon 16 can be driven in quick response to the rotation of the ink ribbon 16.

As described in detail above, according to the present invention, the inclined ribbon feed roller can be rotated with a simple configuration, and the present invention has the advantage of being lightweight, compact, and inexpensive.

[Brief explanation of drawings]

1A and 1A are a plan view and a side view of a printer for explaining an ink ribbon feed mechanism according to the present invention, and FIG. 2 shows an embodiment of an ink ribbon feed mechanism according to the present invention. FIG. 1...Motor, 1a...Rotating shaft, 1b
...Wheel, C...Belt, 2
a...Flywheel, 2b...Eccentric cam, 2C...Shaft, 2d...Pulley,
3... Driven pulley, 4... Curved/Shuttle lever 5... Dot printing element, 6... Sheet feeder, 7... Pulley bracket, 8...
Bent frame, 9... Drive shaft, 10
... Song driven pin, 11 drive pin, 13...
... Upper frame, 14 ... Curved ribbon feed roller, 1
5...One-way clutch, 16...
Ink ribbon, 17...Pressure roller, 1
8... Ribbon cartridge.

Claims (1)

[Scope of utility model registration request] In an ink ribbon feed mechanism in which an ink ribbon is held between a ribbon feed roller and a pressure roller and is fed while being inclined at a predetermined angle with respect to a printing line,
a driven pulley that is rotationally driven in a plane parallel to the printing line; a bearing that obliquely supports a drive shaft that is integrally connected to the ribbon feed roller; a driven pin fixed to one end of the drive shaft; An ink ribbon feed mechanism comprising: a drive pin that is fixed vertically and is restrained in the rotational direction of the driven pin but slidably engages in the vertical direction.