JPS6018346A - Attaching and detaching mechanism of type wheel - Google Patents

Abstract

PURPOSE:To improve interchange and durability of a type wheel, by a method wherein a setter shaft is attached or detached to an axial hole of the type wheel at the same position as the axial position of the pivotal shaft. CONSTITUTION:When a movable table 18 is moved forward, accompanying with advancement of an engaging member 30, an intermediate lever is rotated clockwise by biasing of a spring 31, and corresponding to rearward motion of a bottom end 28a of the intermediate lever, a cassette holder 27 is rotated clockwise about a pivotal shaft 26 as a fulcrum by biasing of a spring 32. The pivotal shaft 26 to support the rotation of the cassette holder 27 is disposed on the same position as the axial center of a setter shaft 24 and an axial hole 35 of a type wheel 33 is disposed on the same position as the pivotal shaft 26, thereby position of the axial hole 35 by rotation of the cassette holder 27 is not shifted from the position of the inserted axial center of the setter shaft 24.

Description

Detailed Description of the Invention Technical Field The present invention relates to a mechanism for attaching and detaching a wheel cassette containing a type wheel to and from a cassette holder of a carriage, which is a printing unit of a printer. , relates to a type wheel attachment/detachment mechanism configured to allow attachment/detachment of a type wheel supported by a cassette holder without misalignment with the shaft hole of the type wheel.

Prior art When a wheel cassette containing a type wheel is attached to or removed from a cassette holder in a printing section, the cassette holder is normally moved in the 'C1 & direction through spring pressure to avoid damage to the ribbon set in the printing section. It is possible to tilt it.

However, the conventional cassette 1 to holder (1) is described in, for example, Japanese Unexamined Patent Publication No. 57-14048, and as shown in FIGS. 1 to 3, the cassette 1 to holder (1) is
2) is carved into the platen (3) as a fulcrum, and normally the cassette holder (]) is tilted counterclockwise in the drawing due to the thinning of the tension spring (4). (5) shows a fixing member on the carriage side having a locking part (5a), and the pivot (2) is supported by this fixing member.

As shown in FIG.
is inserted into the holder from above. type wheel (
6) has a type at the tip of a radial rib, and the type wheel (1) is inserted into the cassette holder (1).
6) at a position corresponding to the shaft hole (8) of the cassette holder (
1) is opposed to the setter hoe III (10) which is rotated by a pulse motor (9).

The setter shaft (10) is attached so that it can move forward or backward together with the motor (9), and when these are moved forward as shown in FIG. 3 by operating a handle (not shown), the setter shaft (10) is the type wheel (
While inserting the tension spring (4) into the shaft hole (8) of the
) and move the cassette holder (1) forward (platen side).
Press to. During this process, the cassette holder (1) rotates in the clockwise direction in the drawing with the pivot (2) as a fulcrum, and the rotation is stopped when the locking part (1a) comes into contact with the locking part (5a). There is.

On the other hand, the setter axis (10) in the second process is the axis (2).
) is inserted into the shaft hole (8) of the type wheel (6) which is in an inclined state with the fulcrum being the fulcrum. However, as shown in FIG. 3, when the type wheel (6) is placed upright at the printing start position via the cassette holder (1), the axis of the shaft hole (8) is aligned with the axis of the setter shaft (10). Since the shaft center is set to be rotated in line with the center of the setter shaft (10), the shaft center of the shaft hole (8) is at a slightly elevated position in the tilted position shown in FIG. For insertion, use the axial hole (
8) will fall in a semicircular direction using the pivot (2) as a fulcrum.

This allows the setter shaft (10) and the type wheel (6) to
The shaft hole (8) means that the type wheel (6) is setter shaft (
10), the insertion pressure of the setter shaft (lO) due to the deviation of the shaft center is applied to the type wheel (6) as an unreasonable load pressure, and the type wheel (6) (6) There was a problem in that it was difficult to attach and detach smoothly. Furthermore, due to the discrepancy between the two axes described in (h), when assembling the cassette holder (1) at the manufacturer's side, the position when the holder is tilted and the position when the holder is upright may differ. The position of the axis (2) must be determined by anticipating the amount of descent in advance. However, this positioning work is complicated and extremely troublesome, and furthermore, misalignment of the axes is unavoidable, making it impossible to obtain a sufficient machine groove.

This invention was made in view of the above, and its object is to tilt a cassette holder that holds a type wheel with respect to the setter shaft, and to attach and detach the type wheel held by the cassette holder to the setter shaft. When the cassette holder stands up and rotates, the axis of the type wheel is configured so that it does not deviate from the axis of the setter shaft, so that the type wheel can be attached to and removed from the setter shaft accurately without causing excessive load pressure. The main reason for this improvement is that it can be performed more easily.

Configuration Next, the present invention will be explained based on an embodiment shown in the drawings.

Figure 4 shows the printing unit (12) mounted on the carriage (11), and the carriage (11) runs along the guide shaft (13) and guide frame (14) in the direction of these guides. It runs along the platen (15).

The carriage (11) is equipped with a motor (for example, a pulse motor) (16) for selectively rotating a type wheel, which will be described later.
) and a part of a printing hammer (17) for impacting the selected type onto the platen (15). It is designed so that it can be manually moved in the front-rear direction (left-right direction in the drawing) along the vertical axis (19). Vertical axis (1
9) are arranged in parallel in this embodiment, and the sliding part (20) is slidably fitted thereto, and the movable table (1
A movable table (
A part of the stopper (21) is provided to restrict the forward and backward movement position of 18). In addition, a part of the Sumi rubber (21) is attached to the carriage (11) side and the leaf spring (21a)
The click ball (21b) is pressed by the click ball (21b), and the positioning hole (21c) is attached to a fixed position on the movable table (18) side and can be engaged with the click ball (21b).
) and (21d). Therefore, the movable table (18) can be moved forward or backward by pressing the operating lever (23) that can be accessed from the motor bracket (22) forward (to the right in the figure) or backward, and the stopper partially (21) is held in the regulation position.

In the above, a setter 4i111 (24) having a setter surface (24a) is attached to the rotating shaft of the motor (16).

On the other hand, a side plate (25) is provided in the front area of the carriage (11).
As is clear from Figure 5,
A cassette holder (27) is attached to this side plate via pivots (26) and (26) so that it can rotate in the front and back direction. The pivots (26) each protrude from the surface area of the cassette holder (27), and their axis (C1) (see Figure 5) is aligned with the axis (C2) of the setter shaft (24) as shown in Figure 4. ) is set at the same height.

The side plate (25) further has an intermediate lever (28) attached to the support shaft (
29), and the lower end of this intermediate lever (
28'a) is adapted to be able to abut against the lower part of the cassette holder (27). Further, the upper end (28b) of the intermediate lever (28) is configured to be able to engage with an engaging portion (30) fixed to the motor bracket (22), and
This intermediate lever is biased by a spring (31) so that it can always rotate clockwise in the drawing.

Similarly, the cassette holder (27) also has a spring (3).
The cassette holder is biased so as to rotate clockwise in the drawing in the same manner as shown in 2), and the tilted state of the cassette holder is regulated by the lower end (28a) of the intermediate lever (28). Therefore, in the state shown in FIG. 4, the movable table (18)
is set in the retracted position, the setter shaft (24) is removed from the cassette holder (27), and the intermediate lever (28) is rotated counterclockwise as the movable table (18) is retracted. The lower part of the cassette 1-holder (27) is pressed and the cassette holder (27) is tilted away from the platen (15). This state is the position for attaching and detaching the wheel set (34), which has a so-called type wheel (33) inside, to and from the cassette holder (27).

As is well known, the wheel force sets 1 to (34) serve to protect the type wheel (33), and are inserted into the cassette holder (27) to be held in place. It's sea urchin. And the cassette holder (27)
In the inserted state, the center of the shaft hole (35) of the type wheel (33) is aligned with the pivot point (33).
It is arranged so that it coincides with the axis (C1) of 1ll(26) and (26). In addition, the alignment of the axis of the shaft hole (35) with the pivot 1111 (26) means that the lateral position of the shaft hole (35) also coincides with the sixth
As shown in the figure, it is positioned coaxially with the pivot i1++b (26).

FIG. 6 shows a state in which the operating lever (23) is pressed forward (to the right in the figure) and the setter shaft (24) is assembled into the shaft hole (35) of the type wheel (33), and the movable table (
18) is in the forward state. Therefore, when the movable table (18) in the state shown in FIG. 4 is moved forward, (1+
As the Ja part (30) moves forward, the intermediate lever (28) is allowed to rotate clockwise in the drawing by the sudden action of the spring (31), and in response to the retreat of the lower end (28a) of the intermediate lever, the cassette 1-holder (27) is the spring (32
) with the pivot (26) as the fulcrum, also as shown in the iH
Rotate to the right.

In the above, the pivot shaft (26) that supports the rotation of the cassette holder (27) is located at the same position as the axis of the setter shaft (24), and is located in the shaft hole (35) of the type wheel (33).
) is in the same position as this pivot (26), so that the shaft hole (35) can be rotated by rotating the cassette holder (27)
The position does not deviate from the insertion axial center position of the setter shaft (24).

Thus, the rising rotation of the cassette holder (27) due to the advancement of the movable table (18) is controlled by the intermediate lever (28).
Due to the removal of the regulation and the urgent use of the spring (32), the lower back of the cassette holder (27) is connected to the stop surface (36) of the carriage.
The axis of the shaft hole (35) is aligned with the axis of the setter shaft (24), and the setter shaft (24) is comfortably inserted into the shaft hole (35). Can be inserted. Note that when the lower part of the holder (27) for the cassette 1 hits the stop surface (36) of the carriage (11) and becomes upright, the upper end (28b) of the intermediate lever (28)
) is separated from the engaging part (30), and the lower end (28a) is attached to the side plate (
The intermediate lever (28) is in a free state in contact with the stop pin (37) which is fixed to the lever (25). Further, in this state, the lower end (28a) is in contact with the back surface of the cassette holder (27) which is in the upright state.

In this way, the setter ll1llll (24) relative to the type wheel (33) can be easily inserted into the shaft hole (
35), and the setter shaft (24)
Type wheel (33) due to mismatch between the and shaft hole (35)
Forcibly pushed.

Or the type wheel (33
), there are no compression defects in the wheel cassette (34). Note that the forward state of the movable table (18) is maintained by a portion of the stopper (2J) and by the type wheel (3).
3) is held upright on the setter surface (21a) and coaxially rotated on the setter shaft (2lI).

On the other hand, the type wheel (33) can be removed from the setter shaft (24) by pressing the operating lever (
23), the setter shaft (24) can be retracted while maintaining a concentric position with the 1lill hole (35),
In this case, the type wheel (33) is in contact with the rear inner wall of the wheel cassette (34) and maintained in an upright state via the cassette holder (27), which is held between the springs (32). Stop surface (36
), and when the setter shaft (24) comes off the type wheel (33) in the above state, the engagement part (30) comes into contact with the upper end (281) of the intermediate lever (28) as it retreats, The intermediate lever (28) is rotated in a direction counterclockwise as shown in the figure, and the lower end (28a) pushes back the lower part of the cassette holder (27) to the front, thereby tilting the cassette holder (27) to the state shown in FIG. Therefore, the setter shaft (24) has the shaft hole (35) at the same shaft center position, and the type wheel (3
3) can be pulled out while maintaining the upright position.

FIG. 7 shows the back side of the cassette holder (27), and at a position corresponding to the center of the type wheel (33) inserted into the cassette holder, there is a setter shaft (24) and its setter surface (24a). There is a window hole (38) into which a wheel can be inserted.
As shown in the figure, a tongue J1 (39) is provided for tightly holding the lever At in the front and stably within the cassette holder (27). Further, on the - side of the cassette holder (27), an elastic member (40) is provided to bring the wheel force set I- (34) into close contact with one side surface to improve positioning.

In the above, the pivot (26) is rotatably attached to the side plate (25), but the bearing part is attached to the side plate (25) as a separate member to facilitate assembly.
The bearing comprising the component (25a) is removably removed.
You can leave it. Of course, the pivot (26) is connected to the side plate (25).
The same effect can be achieved even if a portion of the bearing is provided on the side of the cassette holder (27) with the bearing projecting from the side.

Efficacy: Since the mechanism of this invention is like a double chain, when the operator changes the type wheel, he or she simply points the operating lever toward the wheel cassette without considering the position of the setter shaft. Just push on.

Since the axial center of the setter shaft and the axial center of the shaft hole of the type wheel coincide with each other, the type wheel can be assembled safely and smoothly without imposing an unreasonable suppressing strain on the type wheel. Of course,
The same thing can be said when pulling out the setter 1ii111 from the type wheel, which can be done smoothly and extremely easily without any fear of attaching or removing the setter shaft to the type wheel or damaging the type wheel.

Therefore, according to the present invention, the task of replacing the type wheel can be dramatically improved with peace of mind, and it can also greatly contribute to improving the durability of the type wheel.

[Brief explanation of the drawing]

FIGS. 1 to 3 are explanatory diagrams of conventional examples. Fig. 4 is a side view of the main parts showing one embodiment of the present invention, Fig. 5 is a front view of the same as seen from the cassette holder side, and Fig. 6 shows the setter shaft introduced to the type wheel. 7 is a rear view of the cassette holder, and FIG. 8 is a sectional view taken along the line 8-A shown in FIG. 7. (11) Carriage (24) Setter shaft (2G) Pivot (27) Cassette Holder (33)...
・・・・・・Type wheel (3/l)・・・・・・
・Wheel cassette (35)...Shaft hole patent applicant Tohoku Ricoh Co., Ltd. Agent Patent attorney Shunsuke Nakao Figure 7-A

Claims (1)

[Claims] The pivot position of a cassette holder mounted on a carriage and tilted in the front-rear direction is set at the same height as the axis position of a center shaft located on the carriage, and the cassette holder is inserted into the cassette holder. The type wheel to be attached is attached to the wheel via the cassette so that the center of its shaft hole and the position of the shaft hole are located at the same position as the axis of the pivot of the cassette holder. A type wheel attachment/detachment mechanism, characterized in that the setter shaft can be attached to and removed from the shaft hole of the type wheel at the same position as the axis of the pivot.