JPH0551665U - Ink ribbon winding mechanism of printer - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the occurrence of slack in the ink ribbon during the print track switching operation in a printer device that winds the ink ribbon and switches the print tracks with a single motor. [Structure] Two power transmission systems from a motor to an ink ribbon take-up shaft are provided, and each transmission system is provided with a gear 4 and a gear 9 each having a one-way clutch for transmitting rotation only in the same direction. The gear 7 and the gear 9 are provided so that one of them rotates in the same direction and the other rotates in the opposite direction with respect to the rotation direction of the gear 1 fixed to the rotation shaft of the motor.
As a result, even if the rotation direction of the motor is clockwise,
Even in the counterclockwise direction, the gear 2 to which the ink ribbon winding shaft is fixed rotates in the same direction, so that the ink ribbon winding operation is performed even during the print track switching operation on the ink ribbon. Prevent the occurrence of slack.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an ink ribbon winding mechanism for a printer, and more particularly to an ink ribbon winding mechanism for switching between ink ribbon winding and printing track switching by a single motor.

[0002]

[Prior Art]

 A conventional ink ribbon winding mechanism, for example, as shown in FIG. 2, meshes with the gear 1 as a power transmission system from a gear 1 fixed to a rotation shaft M of a motor to a winding shaft of the ink ribbon, and a one-way clutch (illustrated). There is a gear 4 that is connected to the shaft 3 by (omitted) and a gear 5 that is fixed to the shaft 3 and that meshes with the gear 2 that is directly connected to the ink ribbon winding shaft.

When the motor is rotated clockwise, the gear 1 also rotates clockwise and the gear 4 rotates counterclockwise. By the one-way clutch provided in the gear 4, the rotation of the gear 4 may or may not be transmitted to the shaft 3, but here, the rotation of the gear 4 in the counterclockwise direction is transmitted to the shaft 3. I shall. The counterclockwise rotation of the shaft 3 is transmitted to the gear 2 via the gear 5, so that the ink ribbon take-up shaft is rotated clockwise.

[0006] Here, the ink ribbon is assumed to be wound by clockwise rotation. Further, the gear 1 is connected to the print track switching mechanism on the ink ribbon by the gear 6, and since the same structure as the gear 4, the shaft 3 and the gear 5 is provided in this mechanism, the gear 1 is connected. The clockwise rotation of is not transmitted to the print track switching mechanism.

As a result, when the motor rotates in the clockwise direction, the print track switching operation is not performed, and only the ink ribbon winding operation is performed. On the other hand, when the motor is rotated in the counterclockwise direction, due to the transmission reverse to the above, the ink ribbon winding operation is stopped and the print track switching operation is performed.

[0006]

[Problems to be solved by the device]

 In this conventional ink ribbon take-up mechanism, the ink ribbon take-up operation is stopped while the print track is being switched, so the ink ribbon is likely to sag, and this slack is removed after the print track switching operation. There was a problem that the action to do was necessary.

An object of the present invention is to provide an ink ribbon winding mechanism of a printer device that prevents the occurrence of slack in the ink ribbon during a print track switching operation.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, in the ink ribbon winding mechanism of the printer device according to the present invention, a first power transmission system and a second power transmission system for transmitting the rotation of the motor to the ink ribbon winding shaft are provided. The above-mentioned winding operation and print track can be achieved by driving the ink ribbon and switching the print track on the ink ribbon with a single motor and switching the single rotation direction of this motor. In a printer device that switches between switching operation, the first power transmission system and the second power transmission system have different rotational directions transmitted to the ink ribbon take-up shaft with respect to the rotational direction of the motor. The power transmission system has a one-way clutch that transmits rotation in the same direction to the take-up shaft of the ink ribbon.

[0009]

[Action]

 Rotational force due to normal rotation of the motor is transmitted to the ink ribbon take-up shaft via the first power transmission system, and rotational force due to reverse rotation is transmitted to the ink ribbon take-up shaft via the second power transmission system. The ink ribbon take-up shaft rotates in one direction regardless of whether the motor rotates in the forward or reverse direction, and the ink ribbon does not sag.

[0010]

【Example】

 Next, the present invention will be described with reference to the drawings. FIG. 1 is a plan view of an ink ribbon winding mechanism according to an embodiment of the present invention. The gear 1 is fixed to the rotating shaft of the motor, and the gear 4 meshes with the gear 1 and transmits the counterclockwise rotation to the shaft 3 by a one-way clutch (not shown).

A gear 5 is fixed to the shaft 3, and the gear 5 meshes with a gear 2 having a fixed shaft for winding the ink ribbon by clockwise rotation. The gears 4, 5 and the shaft 3 form a first power transmission system for the ink ribbon take-up shaft.

Further, the gear 9, the gear 10, and the shaft 8 constitute a second power transmission system for the ink ribbon take-up shaft, and structurally correspond to the gear 4, the gear 5, and the shaft 3, respectively. . In the second power transmission system, the rotation of the gear 1 is transmitted to the gear 9 via the gear 7. The gear 6 is a part of a mechanism for switching a print track of an ink ribbon that meshes with the gear 1.

When the motor rotates clockwise, the gear 4 of the first power transmission system rotates counterclockwise, so that the gear 5 rotates counterclockwise via the shaft 3 and the gear 2 Rotate clockwise. At this time, the gear 9 rotates clockwise through the gear 7, and the gear 10 meshes with the gear 2, so that the shaft 8 rotates counterclockwise, but the gear 9 and the shaft 8 rotate. Since there is a one-way clutch between them, each idles independently.

Since a mechanism for transmitting only the counterclockwise rotation of the gear 1 and not the clockwise rotation of the gear 1 is provided in the print track switching mechanism including the gear 6, the clockwise rotation of the motor is not provided. By rotating, the ink ribbon is only wound up.

On the other hand, when the motor is rotated counterclockwise, the gear 6 drives the print track switching mechanism, and the gear 7 rotates the gear 9 which is the second power transmission system in the counterclockwise direction. In order to perform the above, the gear 2 performs the clockwise ribbon winding operation via the gear 10.

At this time, in the first power transmission system, the gear 4 rotates in the clockwise direction, and the gear 5 and the shaft 3 rotate in the counterclockwise direction. become.

[0017]

[Effect of the device]

 As described above, according to the present invention, the ink ribbon winding operation is performed even while the print tracks on the ink ribbon are being switched, so that the slack of the ink ribbon due to the print track switching does not occur. Have.

[Brief description of drawings]

FIG. 1 is a plan view of an ink ribbon winding mechanism according to an embodiment of the present invention.

FIG. 2 is a diagram showing a conventional ink ribbon winding mechanism.

[Explanation of symbols]

 1 Gear 2 Gear 3 Shaft 4 Gear 5 Gear 6 Gear 7 Gear 8 Gear 8 Shaft 9 Gear 10 Gear

Claims (1)

[Scope of utility model registration request] 1. A first power transmission system and a second power transmission system for transmitting the rotation of a motor to an ink ribbon take-up shaft, wherein the ink ribbon is taken up and a printing track on the ink ribbon is provided. A printer device for switching between the winding operation and the print track switching operation by driving the switching and a single rotation direction of the motor and switching the single rotation direction of the motor. And the second power transmission system are different from each other in the rotation direction transmitted to the ink ribbon take-up shaft with respect to the rotation direction of the motor, and each power transmission system transmits the same direction rotation to the ink ribbon take-up shaft. An ink ribbon winding mechanism for a printer, which has a direction clutch.