JPS6132994B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a typewriter, and its purpose is to operate a printing mechanism based on the depression of a key lever, to operate in synchronization with the operation of the printing mechanism, and to press the space bar. In a typewriter in which the carriage is moved step by step in the character feeding direction by an escapement mechanism that is activated based on the press of a key lever, a mechanism that remembers the press of a key lever is used to prevent the printing operation based on a press of any key lever from ending. It allows a new key lever to be pressed and also connects the drive motor when a print is made at the final print position or when the space bar is pressed down at the final print position and the carriage is moved beyond the final print position. To provide a new typewriter which securely disables subsequent printing operations by locking a clutch mechanism provided between a printing mechanism in a released state and clearing stored key lever press contents. It is in.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to drawings showing one embodiment of the present invention. As for the drawings, Fig. 1 is a cross-sectional view showing the keyboard part of the typewriter according to the present invention in detail, Fig. 2 is an exploded perspective view showing the main parts of the typewriter as a whole, and Fig. 3 is an exploded perspective view showing the interposer thereof. 4 is a partially enlarged view of the latching plate, and FIG. 5 is an exploded perspective view showing the type wheel rotation selection mechanism. . It should be noted that the unillustrated parts of this typewriter according to the present invention are substantially the same as those in U.S. Pat.

In the drawing, 1 is a platen mounted on a carriage (not shown) that is placed in the rear of the machine frame 2 so as to be movable left and right, and 3 is a print head mounted on a support stand 4 at a position in front of the platen 1. The printing head is supported via a support shaft 5, and has a large number of printed characters arranged at equal intervals on its spherical outer peripheral surface in a plurality of stages in the vertical direction and in a plurality of rows in the horizontal direction. A key lever 6 is rotatably supported by a support shaft 7 at the front of the machine frame 2, and a key 8 is mounted on the upper part of the key lever.
is attached, and a pressing protrusion 6a is formed at the lower part. Reference numeral 9 denotes an operation plate made of an elastic body fixed to the machine frame 2 at its front end so as to correspond to the pressing protrusion 6a of each key lever 6, and an operation piece 9a is bent downward at the rear end. .
Reference numeral 10 denotes an interposer that is arranged to correspond to the key lever and is rotatably and longitudinally supported by a support shaft 90 that loosely fits into the long hole 10a at the rear end.
An operated portion 10b facing the operating piece 9a of the operation plate 9 is formed on the upper edge thereof, and a driven protrusion 10c, a stepped portion 10d for tilt selection, and a stepped portion 10d for clutch operation are formed on the lower edge from the front to the rear. An operating protrusion 10e and an operating protrusion 10f for rotation selection are respectively formed, and a keyboard section is constructed by arranging a large number of key levers 6, keys 8, operation plates 9, and interposers 10 as described above in parallel. .
11 is a hook-shaped portion 1 at the upper front end of the interposer 10;
A ball 12, which cooperates with the key lever 0g to constitute a known double press prohibition mechanism, is rotated counterclockwise in FIG. 1 by the operation piece 9a of the operation plate 9 when the key lever 6 is pressed down. This is a hooking member for hooking the front end portion 10h of the interposer 10, and as shown enlarged in FIGS. It is formed by punching out the center of each comb-like part (the shaded part in Fig. 4), and then bending it, and the punched hole part 12a
The front end portion 10h of the interposer 9 is hooked. Reference numeral 13 denotes a support for supporting such a latch member 12, which is rotatably supported by a shaft 14 attached to the machine frame 2, and is rotated counterclockwise from the original position shown in FIG. One end of a rod 15, which will be described later, is attached to the opposite end to which the hooking member 12 is attached.

A large number of leaf springs 16 provided on the machine frame 2 are in elastic contact with the working protrusion 10f of each interposer 10, and each interposer 10 is always held in its original position upward and forward by the action of the leaf springs 16. At the same time, when any key 8 is pressed, it is rotated counterclockwise in the figure against the action of the leaf spring 16. A clutch actuating rod 17 is rotatably supported by the machine frame 2 at both ends so as to correspond to the actuating protrusion 10e of each interposer 10, and is urged to rotate clockwise in FIG. 2 by a tension spring 18. There is. A clutch operating lever 19 is rotatably supported by the machine frame 2 below the clutch operating rod 17, and its upper end engages with the clutch operating rod 17 to operate the clutch when the interposer 10 is rotated. It is designed to be rotated clockwise in FIG. 1 via a rod 17.

Reference numeral 20 denotes a rotating shaft to which is fixed an actuating plate 20a for engaging the driven protrusion 10c of the interposer 10 hooked to the hooking member 12 and moving the interposer 10 in the right direction in FIG. When the key lever 6 is pressed down, it rotates once by a clutch mechanism which will be described later. 21 is the above interposer 10
The tilt selection plate is rotated by the stepped portion 10d when the print head 3 moves to the right, and this rotation is coupled to tilt the print head 3 by a predetermined amount. The rotation selection mechanism controlled by the working protrusion 10f of the interposer 10 is as shown in FIG. an abutment plate 22a that is pivoted on a shaft 23 and faces the four interposers; and an extrusion part 22b.
and a latching portion 22c facing the latching plate 24 are integrally formed. When the rotation selection member 22 is rotated clockwise in FIG. 1 by the interposer 10, the pushing portion 22b pushes out the cam follower 25 rightward in FIG. 1 against the spring 26, and the latch portion 22c The cam surface at the upper end once moves the retaining plate 24 against the spring 27 to the fifth position.
The cam follower 25 is rotated clockwise in the figure, and is finally locked with its rear end in contact with the locking plate 24, so that the extrusion portion 22b acts to maintain the cam follower 25 in an extruded state. The cam follower 25 faces a cam 29 attached to a main rotating shaft 28 driven by a clutch mechanism to be described later, and is rotated clockwise in FIG. 1 by the cam 29 as the main rotating shaft 28 rotates. Rotate the cam follower 30 clockwise. Unselected cam follower 3
0 is pivotally supported on a shaft 31 attached to the machine frame 2, and the end of a rotation selection string 32 is attached to a part of the print head 3 according to the amount of rotation.
is rotated in a horizontal plane. The cam follower 25 can be rotated and moved back and forth by a shaft 31 that is loosely fitted in common, and the amount of rotation is in accordance with the cam 29. It is possible to make contact with 33.

A cam 70 is fixed to the main rotating shaft 28, and immediately after the rotation selection operation of the printing head 3 by the cam 29 described above and the printing operation to be described later are performed, the latch plate 24 is moved against the spring 27 as shown in FIG. In order to return the rotation selection member 22 by rotating it in the clockwise direction, the latch portion 71a of the operating lever 71 is pressed, and the operating lever 71 is rotated about the shaft 72 in the direction of the arrow in the figure. The other end of the operating lever 71 is connected to one end of a connecting plate 74 via a rod 73.
A connecting plate 74 pivotally supported on a shaft 75 has the other end connected to the rod 7.
6, and is rotated in the direction of the arrow in the figure by the action of the cam 70, thereby returning the rotation selection member 22 to its original position. Although not shown, the tilt selection mechanism also includes a tilt selection member connected to the tilt selection plate 21, a hook plate,
It is composed of a cam follower, a non-selection cam follower, etc., and the print head 3 is controlled by a tilt selection string.
tilt by a predetermined amount. Further, the tilt selection member is returned to its original position by the cam 70.

34 is a drive shaft rotatably supported approximately in the center of the machine frame, which is connected to the drive motor 35 and is always connected to the second drive shaft.
It is rotationally driven in the direction of the arrow in the figure. 36 is a drive gear rotatably supported on the drive shaft 34;
On one side thereof, there are two clutch pawls 37a on the outer periphery.
A cylindrical clutch member 37 is fixed thereto. The clutch member 37 has a coil spring wound around the drive shaft 34 inside, and when the rotation is restrained, only the rotation of the drive shaft 34 is allowed, and when the restraint is released, the clutch member 37 rotates together with the drive shaft 34 and connects the drive gear. 36 in the direction of the arrow in the figure. A clutch control lever 38 is rotatably supported on the machine frame 2 by a support shaft 39 in the vicinity of the clutch member 37, and an engagement piece 38a that can engage and disengage from the clutch pawl 37a is formed at the upper end of the lever. 40 is rotatably supported, a holding piece 38b is formed at the lower end, and a spring 41 urges the engaging piece 38a in a direction to separate from the clutch pawl 37a. 42 is a holding lever that is rotatably supported by a support shaft 43, and is always supported by a spring 4.
4, the locking portion 42a is locked to the holding piece 38b of the clutch control lever 38, and the clutch member 37
According to the clockwise rotation of the clutch operating lever 19 connected by the connecting rod 45, the restraining operation of the clutch member 37 is released.

A driven gear 4 that meshes with a drive gear 36 and transmits the rotation of the drive shaft 34 to the main rotation shaft is disposed parallel to the drive shaft 34 and is rotatably supported.
6 is fixed, and a return cam 47 is fixed near it, and this return cam 47 moves the clutch control lever 3 as the main rotating shaft 28 rotates.
8 and returns the clutch control lever 38 to a position where it can engage with the clutch pawl 37a of the clutch member 37, thereby releasing the clutch member 37 which had been in the engaged state. For this reason, the clutch member 37 rotates only half a rotation and is restricted from further rotation, and the main rotating shaft rotates once during that period. 48 is a pulley fixed to an end of the main rotating shaft 28, and is connected via a cross belt 49 to a pulley 50 fixed to one end of the rotating shaft 20 of the actuating plate 20a. 51 is a printing cam fixed to the main rotating shaft, and the operating lever 5 is pivotally supported on the shaft 52.
3, the print head support 4 is rotated about a shaft 54, and the print head 3 is struck against the surface of the platen.

Reference numeral 55 is a margin rack placed horizontally on the carriage, and reference numeral 56 is a margin stop that is engaged with and supported by the margin rack 55 to determine the final printing position. 57 is a carriage stopper supported on the machine frame 2 so as to be movable left and right over a certain distance, facing the margin stop 56, and has an engaging protrusion 57 at its upper end that engages with the margin stop 56.
A is formed, and a protruding piece having a spring mounting piece 57b, an operating piece 57c, and an engaging pin 57d is formed at the lower end, and is biased rightward in FIG. 2 by a weak tension spring 58. 59 is an engagement pin 57d
It is a locking lever rotatably supported on the machine frame 2 so as to engage with the machine frame 2, and is always held in a position where it engages with the fixed stopper 61 by a strong tension spring 60 provided between the machine frame 2 and the machine frame 2. The carriage stopper 57 is held in its original position approximately in the middle of its range of movement in cooperation with the weak tension spring 58. This carriage stopper 57 is adapted to engage with a margin stop 56, which is moved as the carriage moves in the character feeding direction, from one character before the final printing position, so that the carriage stops at the final printing position. The movement and the movement from the final printing position each move one pitch to the left from the original position.

62 is a support shaft 43 near the holding lever 42.
A locking member serving as a printing stop means is pivotally supported on the top, and a locking portion 62a that can be engaged with and detached from the holding piece 38b of the clutch control lever 38 is formed at the front end of the locking member.
Although the locking portion 62a is rotationally biased by the spring 63 in a direction to engage with the holding piece 38b, the engagement is normally prevented by the actuating plate 64 opposing the biasing force of the spring 63. The actuating plate 64 is pivoted at the other end of an L-shaped rotating plate 65 which engages with the actuating piece 57c of the carriage stopper 57 at the forked portion 65a at one end, and when the carriage reaches the final printing position. The locking member 62 and the clutch control lever 38 are moved one step further from that position, and the first step of movement prepares the locking member 62 and the clutch control lever 38 for locking, and the subsequent one-step movement ensures a secure locked state. Form. Therefore, this completely prohibits printing operations after the final printing position.

Reference numeral 67 denotes a connecting plate, one end of which is pivotally connected to the intermediate position of the rotary plate 65, and the other end of which is connected to the other end of the rod 15 attached to the support 13 of the hooking member 12. When the printing position is reached, the final printing operation is performed, and the interposer 10 is about to move one more step, the support 13 is rotated so as to release the interposer 10 from the latching operation by the latching member 12. Therefore, after the printing operation at the final printing position is completed, a new printing operation is not performed due to the action of the locking member 62, and the interposer 10 is also released in the memorized state due to the action of the connecting plate 67. It turns out.

Briefly explaining the operation of the typewriter configured as described above, the interposer 10, which is rotated based on the depression of the key lever 6, is always allowed to rotate only once due to the action of the double press prohibition mechanism including the ball 11. , rotated interposer 10
is latched by the latching member 12, and the clutch member 37 is brought into the connected state by the rotation of the clutch actuating lever 19 accompanying the rotation of the clutch member 37, and the drive shaft 3
4 is transmitted to the main rotating shaft 28. Next, the rotation of the main rotating shaft 28 is transmitted to the actuating plate 20a,
The suspended interposer 10 is driven rightward in FIG. 2, the rotation selection mechanism and the tilt selection mechanism are set to their respective selection states, and a predetermined printing operation is performed in accordance with the rotation of the main rotating shaft 28. Then, a new interposer 10 is allowed to be latched simultaneously with the rightward movement of the interposer 10, and the interposer 10 to which the clutch member 37, which was released after the previous printing operation, is newly latched. A similar printing operation is then performed.

As such printing operation progresses and the carriage advances to the final printing position and the printing operation at that position is completed, the rotating plate 65 rotates as the carriage moves one more step, and the clutch member 37
is held in the released state, and the latch member 12
The latching operation of the interposer 10 is prohibited.

As described above, the typewriter according to the present invention has
By providing a mechanism for preventing double pressing of the interposer and interposer latching means to control the printing operation, high-speed printing can be performed reliably and smoothly, and the final printing position that is likely to occur due to such a mechanism can be prevented. It completely prevents unnecessary printing operations following printing operations, and the operator can use it with peace of mind.
As described above, the effects of the present invention are extremely large.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a typewriter according to the present invention, Fig. 2 is an exploded perspective view thereof, Fig. 3 is a partially enlarged sectional view thereof, Fig. 4 is a partially enlarged view thereof, and Fig. 5 is a rotated view thereof. FIG. 3 is an exploded perspective view of the selection mechanism. In the figure, 6 is a key lever, 10 is an interposer, 11 is a ball for preventing double pressing, 1
2 is a latching member that is a latching means, 20a is an actuating plate that is an interposer driving means, 28 is a main rotating shaft,
Reference numeral 37 designates a clutch member, 47 a cam serving as a clutch release means, 62 a locking member constituting a printing stop means, and 65 a rotating plate constituting a detection mechanism.

Claims (1)

[Scope of Claims] 1. A plurality of interposers 10, each arranged corresponding to a predetermined key lever 6, and arranged so as to be movable in a first direction according to the operation of each key lever 6.
and a double push prohibition means for prohibiting other interposers 10 from simultaneously moving in the first direction when one interposer 10 moves in the first direction, and an interposer moved by the key lever 6. a latching means for engaging with a part of the interposer 10 and latching the interposer 10 in the operating position when the double push inhibiting means is in operation, and releasing in conjunction with the movement of the interposer 10 moved to the operating position. A clutch mechanism that is brought into a connected state from a state of engagement, a main rotating shaft 28 that is rotationally connected to a drive shaft 34 by this clutch mechanism, and an interposer 10 that is drivingly coupled to this main rotating shaft 28 and latched in an operating position. Main rotation axis 2
As a result, the first interposer 10 of the other interposer 10 is moved in the second direction as the interposer 8 is rotated, and as a result, the interposer 10 is unlatched by the above-mentioned latching means, the double push inhibiting means is rendered inactive, and the first interposer 10 of the other interposer 10 is moved in the second direction. a printing mechanism that performs a predetermined printing operation in synchronization with the rotation of the main rotating shaft 28 as the interposer 10 moves in the second direction; Clutch releasing means for shifting the clutch mechanism to a released state for each printing operation of the printing mechanism performed by movement of the printing mechanism in the first and second directions; an escapement mechanism that moves the carriage stepwise in the direction; a detection mechanism that is activated when the carriage is moved to the final printing position by the escapement mechanism and detects that the carriage has reached the final printing position; a printing stop for forcibly holding the clutch mechanism in the released state regardless of the movement of the new interposer 10 in the first direction, in order to prevent a printing operation subsequent to the printing operation at the final printing position according to the detection operation of the interposer 10; A typewriter comprising: a means for releasing the locking mechanism; and a locking release mechanism for releasing the locking operation of the locking means in accordance with the detection operation of the detection mechanism.