JPH055465U - Small printer selection mechanism - Google Patents

Abstract

(57) [Abstract] [Purpose] The purpose of the present invention is to provide the trigger plate 3 of the trigger yoke 1.
The purpose is to prevent wear of the contact surface 1a with and to improve the functional quality. [Structure] The structure is such that a spiral groove 1b is formed on a contact surface 1a of a trigger yoke 1 with a trigger plate 3, so that when the trigger yoke 1 makes one revolution, the entire contact surface of the trigger plate 3 comes into contact with the lubricating oil. Prevents abrasion by supplying.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a small printer selection mechanism.

[0002]

[Prior Art]

 FIG. 5 shows a typical example of a selection mechanism of a conventional small-sized printer. FIG. 5 shows the periphery of the trigger magnet, which is attracted when magnetized by the trigger yoke 10 which rotates in the direction of arrow A and the trigger coil 20 which is in constant contact with the trigger yoke 10 and which is energized, and is moved to the position B in the direction of arrow A. In the selection mechanism of the small printer using the flat plate type electromagnet of the trigger lever 30 (not shown) that returns the trigger plate 30 to the standby position B after the power supply to the trigger plate 30 rotating from the position C to the position C is cut off, As shown in FIG. 5, the contact surface 10a of the trigger yoke 10 that is in sliding contact with the trigger plate 30 has a concentric groove 10b.

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned conventional technique, the contact relationship between the trigger plate 30 and the trigger yoke contact surface 10a is such that the groove 10b is concentric and the groove 10b always contacts the trigger plate 30 at the same position. As a result, the lubricating oil is not sufficiently supplied to the portion that does not come into contact with the groove 10b and is worn. Further, abrasion powder accumulates in the concentric groove 10b, and this is mixed with the lubricating oil to form a grease-like substance, which increases the viscosity. As a result, the coefficient of friction between the contact surface 10a of the trigger yoke 10 with the trigger plate 30 and the trigger plate 30 increases, and after the power supply to the trigger coil 20 is cut off, the trigger plate 30 receives the force of the trigger lever spring (not shown). However, there is a drawback in that it cannot return to the standby position B by itself. Further, in order to prevent the above-mentioned drawbacks, it is necessary to provide strict dimensional control / standards of parts to reduce variations in parts tolerance, which has been a barrier to cost reduction.

The present invention has been made in order to solve such a drawback, and an object thereof is to provide a selection mechanism for a small printer which is functionally stable without lowering the function and is low in cost. To do.

[0005]

[Means for solving the problem]

 The selection mechanism of the small printer of the present invention has a trigger yoke that rotates in synchronization with the rotation axis, an electromagnetic means that magnetizes the trigger yoke, and a trigger plate that is attracted to the trigger yoke and rotates when the trigger yoke is magnetized and magnetized. In the small printer selection mechanism, the contact surface of the trigger yoke that comes into contact with the trigger plate is characterized by forming a spiral groove.

[0006]

[Action]

 According to the above configuration of the present invention, since the lubricating oil is evenly supplied to the contact surface by the spiral groove, it is hard to wear. Also, the wear is removed from the contact surface by the groove.

[0007]

【Example】

 An embodiment of the present invention will be described with reference to an example of a selection mechanism used in a small printer and a drawing of a trigger yoke shape. FIG. 1 is an exploded perspective view showing a configuration of a selection mechanism of a small printer according to an embodiment of the present invention, and FIG. 2 is a sectional view showing a configuration of a selection mechanism of a small printer according to an embodiment of the present invention. FIG. 3 is a configuration diagram showing the operation of each component. FIG. 4 is a shape diagram of a contact surface of a trigger yoke showing an embodiment of the present invention.

Reference numeral 1 denotes a trigger yoke, which is rotationally driven and fixed to a type wheel shaft 7 having an oval cross section by a selection gear 9. Reference numeral 3 is a trigger plate, and a trigger plate spring 6 presses the contact surface 1a of the trigger yoke 1 into pressure contact. 1b is a spiral groove formed on the contact surface 1a of the trigger yoke 1. Reference numeral 2 is a trigger coil that magnetizes the trigger yoke 1 and attracts the trigger plate 3. Reference numeral 5 is a trigger lever spring for urging a return force so that the pressure-contacted trigger plate 3 does not rotate together with the trigger yoke.

In the character selection state, power is transmitted by the selection gear 9 of FIGS. 1 and 2, and the selection gear 9, the trigger yoke 1 and the type wheel shaft 7 rotate in the direction of arrow A in FIG. At this time, the trigger plate 3 and the trigger lever 4 are in the position B in FIG. 3, and the trigger plate 3 is in contact with the contact surface 1a of the trigger yoke by the trigger plate spring 6 in FIG. Here, in order to print a desired character, when the trigger coil 2 of FIG. 3 is energized, the trigger yoke 1 is magnetized and the trigger plate 3 is attracted to rotate the trigger plate 3 and the trigger lever 4 in the arrow A direction to the C position. At this time, the 4a part of the trigger lever 4 pushes up the 8a part of the selection lever 8 in the D direction, and the 8b part of the selection lever 8 comes into contact with the 9a part of the selection gear 9 to stop the rotation of the selection gear 9 and shift to the printing process. I will do it. After this, the trigger coil 2 is de-energized and the trigger yoke 1 loses its attractive force, and the trigger plate 3 and trigger lever 4 return to position B in FIG. 3 due to the spring force of the trigger lever spring 5 in FIGS. In this way, the operations shown above are repeated to perform character selection and printing process.

A spiral groove 1 b as shown in FIG. 4 is formed on a contact surface 1 a of the trigger yoke 1 with the trigger plate 3. The groove 1b is provided to store lubricating oil. When the trigger yoke 1 makes one revolution, the groove 1b can contact the entire contact surface of the trigger plate 3 with the trigger yoke 1a, so that the lubricating oil can be supplied to the entire contact surface of the trigger plate 3 with the trigger yoke 1a. .. Therefore, it is excellent in wear for durability. Further, because of the spiral groove 1b, the wear powder accumulated in the groove 1b can be automatically discharged to the outside by one rotation of the trigger yoke 1a and the trigger plate 3 coming into contact with each other. The coefficient of friction does not change significantly.

[0011]

[Effect of the device]

As described above, according to the present invention, since the groove is formed on the spiral, the lubricating oil is supplied to the entire contact surface between the trigger yoke and the trigger plate, so that it is excellent in wear and has a remarkable friction coefficient. Since there is no change, the trigger plate completely returns to the standby position only by the spring force of the trigger lever spring after the power supply to the trigger coil is cut off. Further, there is an effect that cost can be reduced because strict dimensional control / standard of parts is not required.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a configuration of a selection mechanism of a small printer according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a configuration of a selection mechanism of a small printer according to an embodiment of the present invention.

FIG. 3 is a configuration diagram showing the operation of each component in the embodiment of the present invention.

FIG. 4 is a shape view of a contact surface of a trigger yoke showing an embodiment of the present invention.

FIG. 5 is a configuration diagram showing the operation of each component in the conventional technique.

FIG. 6 is a shape diagram of a trigger yoke showing a conventional technique.

[Explanation of symbols]

1 Trigger yoke 1a Contact surface of trigger yoke 1 with trigger plate 3 1b Spiral groove formed on contact surface 1a of trigger yoke 1 2 Trigger coil 3 Trigger plate 5 Trigger lever spring 6 Trigger leaf spring 7 Type wheel shaft 9 Selection gear 9a selection Contact part of gear selection lever 8 with 8b part

Claims (1)

Claims for utility model registration: Claim 1. A trigger yoke that rotates in synchronization with a rotation axis, electromagnetic means for magnetizing the trigger yoke, and pressure contact with the trigger yoke, and when the trigger yoke is magnetized, it is attracted to the trigger yoke. In a selection mechanism of a small printer having a rotating trigger plate, a contact surface of the trigger yoke that contacts the trigger plate is
A selection mechanism for a small printer, which is characterized by forming a spiral groove.