JP2897089B2 - Open lock mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a communication printer (passbook,
The present invention relates to an open lock mechanism for preventing unlocking of a print head of a slip printer outside of an unlock area.

[0002] In recent years, with the simplification of banking operations, users have strongly desired that the operation of exchanging ribbon cassettes can be easily performed. For this reason, a method is employed in which the print head is rotated in the unlocked area to move the ribbon to a position where it can be easily operated.

[0003]

2. Description of the Related Art FIG. 4 is a plan view showing an outline of the structure of a conventional printer. In the drawing, reference numeral 1 denotes a first frame, 2 denotes a second frame, 3 denotes a carrier, and 4 denotes a print head mounted on the carrier 3. Reference numerals 5 and 5 indicate unlock levers.

The first frame 1 supports a stay shaft 6, and the second frame 2 is rotatably supported by the stay shaft 6 near both ends. Carrier 3 is
A stay shaft 6 is rotatably and slidably supported. 4 is an explanatory diagram of a configuration and an operation of a main part of FIG. 4 at a designated position S on one end side of the second frame 2. As shown in detail in FIG. 5, the guide portion 2 is provided, and the carrier 3 is provided with two bearings 7 and 8 facing each other with a space therebetween. The guide portion 2 is connected on the same plane as the fixed guide 9 in the locked state shown in FIG. 5A, and the bearings 7 and 8 sandwich the fixed guide 9 and the guide portion 8 from both sides. Reference numeral 10 denotes a mask for the print head 4.

In the normal state, the second frame 2 is locked by the lock release lever 5 as shown in FIG. 5A, and printing is performed in this state. A spring 11 urges the second frame 2 in the direction of arrow A to lock a pin 12 provided on the second frame 2 to one end 5a of the lock release lever 5.

When replacing a ribbon cassette (not shown), the carrier 3 is moved to the designated position S on the left end as shown in FIG. 4 and the lock release lever 5 is pushed down in the direction of arrow B in FIG. Thereby, the locking of the pin 12 by the one end 5a is released (unlocked), and the second frame 2 is
In this state, since the bearings 7 and 8 sandwich the guide portion 2a, the carrier 3 also rotates. As a result, the print head is retracted from the platen (not shown), and the ribbon cassette can be easily replaced.

[0007]

However, in the above-mentioned conventional structure, the carrier 3 is positioned at the designated position of the second frame 2 (FIG. 4).
Position), the lock release lever 5 can be pushed down, so that the second frame 2 and the carrier 3 rotate when the carrier 3 comes off the fixed guide 9 and moves to the designated position of the second frame 2. This is the cause of the failure.

An object of the present invention is to provide an open lock mechanism that can prevent a failure when the unlock lever is pushed down when there is no carrier at a designated position of the second frame.

[0009]

In order to achieve the above-mentioned object, according to the present invention, a printhead is mounted on a second frame rotatably supported by a stay shaft supported by a first frame near both ends. A carrier that is slidably and rotatably supported by the stay shaft inside the second frame, and a lock release lever that locks the rotation of the second frame; A printer provided with a guide portion for guiding the carrier by engaging with the carrier when the carrier guided by the fixed guide is disengaged from the fixed guide and moves to the specified position at the designated position. The first frame is provided with a stud which is urged by a spring to lock the rotation of the second frame, and the carrier is moved to the carrier at the end of the designated position. So the stud when moved against the biasing force of the spring to a structure, characterized in that a latch release member for releasing the engagement of the second frame.

[0010]

[Function] Even if the lock release lever is pressed when the carrier is not at the specified position (when guided by the fixed guide),
Since the studs lock the rotation of the second frame, the lock is not released, and the second frame does not rotate just when the carrier enters the designated position. That is, it is open-locked.

When replacing the ribbon cassette, the carrier is moved to the end of the designated position. Thereby, the lock releasing member moves the stud against the urging force of the spring to release the lock of the second frame. That is, the open lock is released. Therefore, in this state, the second frame can be rotated by depressing the lock release lever, and the print head can be retracted from the platen. In this state, the ribbon cassette can be easily replaced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a plan view showing an outline of the structure of the printer of this embodiment, and FIG.
Shows the locked state of the second frame, and FIG.
In the drawing, 21 is a stud, 22 is an unlocking member, and these constitute an open lock mechanism 20. The same reference numerals are used for members similar to those in the related art. The configuration and operation of the open lock mechanism 20 are as follows.

The stud 21 is held by the first frame 1 and the box 24 as shown in FIG. 3A, and is urged by a spring 23 in the direction of arrow C. The stud 21 normally protrudes to the right by a maximum amount and locks the rotation of the second frame 2. In this case, even if the lock release lever 5 is pressed down when the carrier 3 is not at the specified position (when guided by the fixed guide 9), the lock is not released by the locking by the stud 21 and the carrier 3 is designated. The second frame 2 does not rotate just by entering the position.
That is, in this state, it is open-locked as shown in FIG. 24 is a box, a stud 21
And the spring 22 is housed.

On the other hand, the lock release member 22 is fixed to the carrier 3. When the carrier 3 is moved to the end of the designated position when replacing the ribbon cassette, the lock releasing member 22 engages with the stud 21 as shown in FIG. To release the locking of the second frame. That is,
The open lock is released. Therefore, in this state,
By depressing the lock release lever 5, the second frame can be rotated from the position shown in FIG. 2A to the position shown in FIG. 2B, and the print head 4 can be retracted from the platen.

By adopting the open lock mechanism having such a configuration and operation, the second frame (carrier) does not rotate except when the carrier 3 has moved to a specific position at the end. In other words, if the carrier 3 simply enters the guide portion 2a at the designated position while the lock release lever 5 is erroneously depressed, the second frame does not rotate, and the conventional problem can be solved.

[0017]

As described above, according to the present invention, it is possible to operate safely and easily by removing the cause of the failure that the carrier and the print head are opened at a position other than a specific position. Greatly contributes to the simplification of the operator's operation.

[Brief description of the drawings]

FIG. 1 is a plan view showing an outline of the structure of a printer according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a configuration and an operation of a main part of FIG. 1, and FIG.
FIG. 2B is a side view showing the locked state of the second frame, and FIG.
FIG. 7 is a side view showing the unlocked state of the second frame.

3A and 3B are detailed views of an open lock mechanism according to an embodiment of the present invention. FIG. 3A is a plan view showing an open lock state, and FIG. 3B is a plan view showing an open state.

FIG. 4 is a plan view showing a general structure of a conventional printer.

FIG. 5 is an explanatory diagram of a configuration and an operation of a main part of FIG. 4, and FIG.
Is a side view showing the locked state of the second frame, and FIG.
FIG. 7 is a side view showing the unlocked state of the second frame.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st frame 2 2nd frame 3 Carrier 4 Print head 5 Lock release lever 6 Stay shaft 9 Fixed guide 20 Open lock mechanism 21 Stud 22 Lock release member 23 Spring

Continued on the front page (58) Fields surveyed (Int.Cl. ⁶ , DB name) B41J 25/312 B41J 25/316 B41J 29/54 B41J 29/56 B41J 35/28

Claims (1)

(57) [Claims] 1. A second shaft rotatably supported near both ends by a stay shaft (6) supported by a first frame (1).
A frame (2) and a print head (4) are mounted, and the stay shaft (6) is provided inside the second frame (2).
A carrier (3) slidably and rotatably supported on the second frame (2); and a lock release lever (5) for locking the rotation of the second frame (2), and one end of the second frame (2). When the carrier (3) guided by the fixed guide (9) is disengaged from the fixed guide (9) and moves to the specified position, the carrier (3) engages with the carrier (3) at the designated position. In the printer provided with the guide portion (2a) for guiding (3), the first frame (1) is urged by a spring (23) and protrudes to lock the rotation of the second frame (2). A stud (21) is provided on the carrier (3). When the carrier (3) moves to the end of the designated position, the stud (21) resists the urging force of the spring (23). And move it to the second frame (2). An open lock mechanism comprising a lock release member (22) for releasing lock.