JPS5829745B2 - Typewriter character selection mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a typewriter in which printing is performed by a single print head having a large number of characters arranged in rows on its outer periphery.

For typewriters with one print head, a major problem is how to select desired characters from among the many characters provided on the circumference of the print head, and the mechanism is 1.
As exemplified by the character selection mechanism (addition mechanism) used in typewriters manufactured by B and M companies, the structure tends to be extremely complicated.

The present invention provides a character selection mechanism that is reliable in its operation and has a simple structure.

An embodiment of the present invention will be described below with reference to the drawings.

In the explanation, front and rear refer to the side closest to the typewriter operator as the front, and the side far away from the typewriter operator as the rear.

Moreover, the left and right are mainly described with respect to the operator.

In the figure, 1 is a key lever in which a shaft hole 1a provided at the rear end is rotatably supported on a pivot (not shown) fixed to the machine frame, and the upper end of a rising portion 1b provided at the intermediate portion. A printing key 2 is fixed to the front end, and the front end corresponds to a clutch shaft 3 for operating a one-turn clutch (not shown).

Reference numeral 4 designates a leaf spring having an operating portion 4a bent downward at its rear end, which fixes its front end to the machine frame and connects the upper surface of the rear end of the leaf spring 4 to the center of the key lever 1. The key lever 1 is always urged upward by contacting a hanging portion 1c which is provided to project downward from the key lever 1.

Reference numeral 5 denotes an interposer in which a long hole 5a provided at the rear end is loosely fitted into a shaft 8 fixed to the machine frame, and an abutment portion corresponding to the actuating portion 4a of the plate spring 4 is provided on the upper surface of the intermediate portion of the interposer. 5b is provided in a protruding manner, and an engaging claw portion 5c that engages with and disengages from a drive plate 7, which will be described later, is provided in a protruding manner on the lower surface of the front end portion.

Reference numeral 7 denotes a drive plate that is rotatably provided on the machine frame so as to correspond to the locking claw portion 5c, and is powered by a drive motor (not shown) when the one-turn clutch described above is activated. For example, it is rotated once in the direction of arrow A and the direction opposite to arrow A within a range of about 45 degrees.

Reference numeral 8 denotes a puller whose one end is attached near the engaging claw part 5c of the interposer 5, and the other end is attached to the machine frame (not shown) located in front of the engaging claw part 5c. Thus, the interposer 5 is always urged forward and upward.

When interposer 5 is in its original position,
The engaging claw portion 5c thereof is located above the rotation locus of the drive plate 7 (see the two-dot chain line in FIG. 2).

9, the upper and lower ends of the front end plate 10 and the rear end plate 11 are connected to the connecting plate 1.
2.12 is a selection plate having a substantially rectangular cylindrical shape, which is connected to a pivot 15 fixed to the machine frame 13 with a nut 14 so as to be oriented substantially horizontally in the longitudinal direction. The central portion is pivotally supported to be pivotable, that is, to be rotatable in the direction of arrow B and in the direction opposite to arrow B.

Reference numeral 16 denotes an eccentric cam as a cam member which is located on the left side of the selection plate 9 and is rotatably provided on the machine frame (not shown). rotated once.

Reference numeral 17 denotes a support plate fixed to the left end of the selection plate 9 by, for example, caulking, and this has two support parts 17a (only one shown) that face each other at a predetermined distance in the vertical direction and protrude toward the left. The two supporting parts 17a
Sliding members 18, 18 each having a sliding surface 18a that slides on the eccentric cam 16 are fitted and fixed thereto.

The two sliding contact members 18° 18 have respective sliding contact surfaces 18.
a, 18a sandwich the eccentric cam 16 and come into close contact with each other without play, so that the amount of eccentricity of the eccentric cam 16 is positively transmitted to the selection plate 9.

Reference numeral 19 designates, for example, ten selectors disposed on the selection board 9 so as to be movable back and forth with a predetermined interval a left and right, respectively;
One of these selectors 19 is arranged directly below the pivot 15 and is pressed, and the remaining selectors 19 are arranged in a straight line on both sides of the pivot 15, and three of them are arranged directly below the pivot 15. The remaining six are located on the right side of the axis 15.

In the solution selector 19, a suppressing part 20 having a suppressing surface 20a corresponding to the rear end of the interposer 5 is integrally provided at the front end of the shaft part 19a, and this pressing part 20 is formed on the front end plate 10. The rear end portion of the shaft portion 19a is also slidably supported in the insertion hole 11a formed in the rear end plate 11.

A compression spring 29 is a spring member wound around the shaft portion 19a of the selector 19. One end of this spring is in contact with the rear surface of the suppressing portion 20, and the other end is in contact with the front surface of the rear end plate 11. There is.

20b is a locking piece projecting left and right from the rear end of the pressing part 20, and the selector 19 is normally urged forward by a compression spring 21 to lock it as shown in FIG. The piece 20b is held in an inoperative position where the front end plate 20b abuts the rear surface of the front end plate 10.

When the interposer 5 is moved rearward by swinging the driving plate 7 in the direction of the arrow A based on the depression of the key 2, the selector 19 corresponding to the interposer 5 is moved by the compression spring 21. It is adapted to be moved rearward or into an operating position against a force.

Reference numeral 22 denotes a stopper located at the left end of the selection plate 9 with a distance a from the leftmost selector 19. It consists of a roller 25 rotatably inserted through the rear end of a stopper pin 24, and is arranged approximately on the same line as the nine selectors 19 arranged on a straight line.

Now, for example, 44 key levers 1 having the above-mentioned printing keys 2 are provided in the front half of the machine frame, and each key lever 1
The leaf spring 4 and interposer 5 corresponding to 44
There are several.

And 44 interposers - 40 out of 5 are 10
The four interposers 5 (located on the leftmost side of the machine frame) are pressed against any of the ten selectors 19. Therefore, the stopper 22 takes the place of the selector 10.

Reference numeral 26 denotes a guide shaft as a rotating shaft located behind the selection plate 9 and rotatably supported on the machine frame (not shown), which is parallel to the plane containing the rotational movement of the selection plate 9. It is arranged approximately horizontally on a plane.

27 and 28 are two pinions of the same shape provided at both left and right ends of the guide shaft 26.

Reference numeral 29 denotes a movable plate located between the selection plate 9 and the guide shaft 26 and guided and supported by the machine frame (not shown) so as to be able to move up and down. Matching ranks 30 and 31 are fixed.

The movable plate 29 is always urged upward via the pinion 2728 and the racks 30 and 31 because the guide shaft 26 is urged in the direction of the arrow by the urging means described later. The upper end portion thereof is located at the original position in contact with the roller 25 of the stopper 22.

Reference numeral 29a is a substantially U-shaped groove portion formed in a substantially central portion of the movable plate 29 so as to correspond to the pivot shaft 45a and open upward.

Thus, the moving plate 29 moves each selector 19 when the selector 19 is moved to the operating position against the biasing force of the compression spring 21.
The rear end plate 11 of the selection plate 9 is arranged so as to be able to engage with the shaft portion 19a of the selection plate 9.
The interval is set.

When each selector 19 is moved to the operating position with the selection plate 9 and the movable plate 29 in the original position, the shaft portions 19a of the selectors 19 are moved to the upper edge of the movable plate 29 and the groove portion 29.
It is positioned above the bottom part of A with a slight gap.

Reference numeral 33 denotes a spring drum as a biasing means, and a spring mechanism for applying rotational force in the direction of arrow E to the drive shaft 34 is disposed inside the spring drum.

Reference numeral 35 denotes a substantially spherical print head fixed to the drive shaft 34, on the outer periphery of which letters 35a corresponding to each key 2 are arranged in four rows in the circumferential direction.

Eleven uppercase and lowercase letters are provided in each row, and the uppercase and lowercase letters are set in a positional relationship such that they face each other with the drive shaft 34 in between.

36 is a drive pulley 37 fixed to the drive shaft 34
38 is a driven pulley fixed to the right end of the guide shaft 26;
39 is an intermediate pulley rotatably supported by a machine frame (not shown) located behind the driven pulley 37; and 39 is a shift actuator rotatably provided at the tip of a shift arm 40 located on the right side of the drive pulley 36. This is a pulley for use.

Reference numeral 41 denotes a wire member whose one end is fixed to a suitable part of the outer periphery of the drive pulley 36, and whose middle part is attached to the pulley 3.
9 and the intermediate pulley 38 in order, and the other end is fixed to an appropriate location on the outer periphery of the driven pulley 37.

Therefore, the drive shaft 34 is driven by the spring drum 33.
The rotational biasing force in the direction of arrow E is transmitted to the moving plate through a transmission means consisting of a driving pulley 36, a wire member 41, a driven pulley 37, a guide shaft 26, pinions 27 and 28, racks 30 and 31, etc. 29, and the movable plate 29 is always urged upward as described above.

Thus, the aforementioned shift arm 40 is swung in the direction of arrow F, for example, based on the depressing operation of a shift key (not shown), and at this time, the drive shaft is rotated regardless of the position of the movable plate 29. 34 is rotated 180 degrees from before the shift.

That is, based on this shift operation, the platen 3 is
The uppercase letters now face the platen 32 instead of the lowercase letters of the print head 35 that were facing 2.

Reference numerals 42 and 43 denote tilt operation plates that are rotatably provided on the machine frame and located behind the drive plate 7, and engagement portions 42a and 43a are provided at predetermined positions, respectively, on the upper ends of these plates, and buttons are provided at predetermined positions. Further, on the lower surface of each interposer 5, actuating claws 5d and 5f corresponding to the tilt actuating plates 42 and 43 are provided.

Therefore, when an arbitrary interposer 5 is moved rearward, if the engaging portions 42a and 43a are provided at positions corresponding to the operating claws 5d and 5f of the interposer 5, the tilt operating plate 43 The husband operating claws 5d and 5f
The interposer is rotated in the direction of arrow G by
Engagement portions 42a are located at positions corresponding to the operating claws 5d and 5f of No.5.
and 43a are not provided, the tilt operating plates 42 and 43 are positioned at their original positions regardless of the backward movement of the interposer 5.

Therefore, when only one tilt operating plate 42 is rotated by moving any interposer 5 rearward,
There are four types of states: when only the other tilt operating plate 43 is rotated, when both tilt operating plates 42 and 43 are rotated, and when neither of the tilt operating plates 42 and 43 is rotated. is set so that it can be obtained.

Although not shown, the above-mentioned tilt operation plates 42 and 4
A tilt mechanism is provided for tilting the print head 36 in accordance with the four types of conditions in 3.
Any one of the upper four character groups is selected to correspond to the platen 32.

Next, the operation of this embodiment configured as above will be explained.

When the key 2 is pressed down, the key lever 1 is rotated downward about the track hole 1a against the biasing force of the leaf spring 4, and the operating portion 4a of the leaf spring 4 is displaced downward.

Then, the actuating portion 4a of the leaf spring 4 is activated by the interposer.
5 and rotates the rear end of the interposer 5 downward against the biasing force of the tension spring 8, so that the engagement claw 5c follows the rotation locus of the drive plate 7. located within.

On the other hand, the clutch shaft 3 is pushed down based on the downward rotation of the key lever 1, and a one-turn clutch (not shown) is operated, so that the drive plate 7 is moved approximately 45 degrees in the direction of arrow A.
The interposer 5 is rotated, and the interposer 5 is moved rearward against the tension spring 8 through the engaging claw portion 5c of the interposer 5, so that the rear end of the interposer 5 corresponds to the interposer 5. Suppressing surface 1 of selector 19 (in the case of FIG. 1, the selector located first on the right side from axis 15)
By coming into contact with 9a, the selector 19 is moved to an operating position against the biasing force of the compression spring 21.

On the other hand, by operating the one-turn clutch mentioned above,
The eccentric cam 16 is also rotationally driven in the direction of the arrow C, but the selection plate 9 starts rotating in the direction of the arrow B by the eccentric cam 16 slightly later than the time when the aforementioned selector 19 is placed in the operating position. .

Then, when the selection plate 9 is rotated in the direction of arrow B with the aforementioned selector 19 (positioned first on the right side of the pivot 15) located at the operating position, the selector 19 is moved to the movable plate. 2
9 to move the movable plate 29 downward.

Based on the downward movement of the moving plate 29, the rack 30.31
The guide shaft 26 is rotated in the opposite direction through the pinions 27 and 28, and the wire member 41 is pulled in the winding direction by the driven pulley 37, and the drive shaft 34 is rotated against the biasing force of the spring drum 33. It is rotated in the opposite direction of arrow E.

Then, when the selection plate 9 is rotated to the maximum in the direction of arrow B, the print head 35 is struck against the platen 32 and a printing operation is performed.

In this way, when the selection plate 9 is rotated to the maximum in the direction of arrow B, the amount of downward movement of the movable plate 29 is transmitted to the drive shaft 34 via the transmission means including the wire member 41 in the opposite direction of the arrow E. The printed character 35a corresponding to the character selected by the key 2 is transmitted as the amount of rotation in the direction.
is opposed to the platen 32.

Then, based on the forward movement of the interposer 5, the tilt operating plates 42 and 43 are selectively rotated in the direction of arrow G, and the print head 35 is tilted before the print head 35 performs a printing operation. A predetermined one of the four-column type group
As mentioned above, the stage is selected.

When the printing operation by the print head 35 is completed in this way, the drive plate 7 rotates back in the direction opposite to the arrow A and returns to its original position, and the interposer 5 is also urged by the tension spring 8 and returns to its original position.

Then, as the eccentric cam 16 rotates until it completes one rotation, the selection plate 9 and the moving plate 29 are moved back to the stopper 2.
It returns to the original position where it touched 2.

With the return operation of the interposer 5, the selector 19 is moved to the inoperative position by the biasing force of the compression spring, and the engagement between the movable plate 29 and the selector 19 is released.

The above operation occurs when the key 2 corresponding to the first selector 19 on the right side of the axis 15 is pressed down. For example, the key 2 corresponding to each selector 19 located on the right side of the axis 15 is depressed. In this case, the print head 35 is rotated in substantially the same manner as described above, so that the print head 35 corresponds to the character selected by the key 2 or the platen 32.

That is, since the maximum amount of rotation of the selection plate 9 in the direction of arrow B, which is rotated by the eccentric cam 16 based on the depression of the key 2, is always constant, the slider 19 that is distant from the pivot 15 is moved to the operating position. In this case, the amount of downward movement of the movable plate 29 is small, and when the movable element 19 near the pivot 15 is moved to the operating position, the amount of downward movement of the movable plate 29 is small. .

Since the print head 32 performs a printing operation when the movable plate 29 reaches its maximum movement amount at that time, the amount of rotation of the print head 35 is determined according to the amount of movement of the movable plate 29 at that time.

Furthermore, when the key 2 corresponding to each selector 19 located on the left side of the axis 15 is pressed down, the selection plate 9 is rotated in the direction of arrow B, and the movable plate 29 moves as described above. On the contrary, it will be moved upwards, but the moving plate 2
The same operation as in the previous case is performed except that the print head 35 is rotated in the direction of the arrow E to correspond to the upward movement amount of the print head 35 corresponding to the character selected by the key 2. The upper printed characters 35a come to face the platen 32.

Furthermore, when the key 2 corresponding to the four interposers 6 that do not correspond to any of the selectors 19 is pressed, the moving plate is moved based on the selection plate 9 being rotated in the direction of arrow B. 29 is moved upward while always being engaged with the stopper 22, and the print head 35 is rotated in the direction of arrow E to correspond to the amount of movement of the moving plate 29.

When the key 2 corresponding to the selector 19 located directly below the pivot shaft 15 is pressed down, the selector 19 is moved to the operating position and engaged with the groove 29a of the movable plate 29. Even if the selection plate 9 is rotated, the moving plate 29
The printed characters 35a on the print head 35, which is held in the original position and faces the original position and corresponds to the platen 32, are printed.

As is clear from the above description, the present invention provides a simple character selection mechanism for a typewriter that can perform printing operations by rotating one print head to appropriately select desired characters. can.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a schematic perspective view, FIG. 2 is a sectional view taken along the line from the peak in FIG. 1,
FIG. 3 is an enlarged top view of the main parts. In the drawing, 1 is a key lever, 2 is a key, 5 is an interposer, 17 is a drive plate, 9 is a selection plate, 13 is a machine frame, 16 is an eccentric cam (cam member), 19 is a selector, 21 is a compression spring (
22 is a stopper, 26 is a guide shaft (rotating shaft)
, 27 and 28 are pinions, 29 is a moving plate, 30 and 3
1 is a rack, 32 is a platen, 33 is a spring drum (biasing means), 34 is a drive shaft (rotating shaft), 35 is a print head, 35a is a type, 36, 37, 38 and 39
Reference numerals denote a driving pulley, a driven pulley, an intermediate pulley, and a pulley that constitute the transmission means, 41 is a wire member, and 42 and 43 are tilt operating plates.

Claims (1)

[Scope of Claims] 1. A typewriter that performs printing operations by rotating one print head in which a large number of type characters are lined up on its outer periphery to appropriately select the desired type, and presses a number of key levers. and,
an interposer that corresponds to each key lever and moves based on each depression; a cam member that rotates once based on the depression of the key lever; and an interposer that is positively connected to the cam member and moves based on the rotation of the cam member. A selection plate that swings with a central portion as a pivot point, and a plurality of selection plates supported at intervals on the left and right sides of the pivot point and always held in an inoperative position by a spring member to move the interposer. A selector is provided which is moved to the operating position based on the selection plate, and the selector is disposed at a position where it can engage with the selector moved to the operating position of the selection plate and is normally connected to the stopper by a biasing means. a movable plate that is held in the original position where it engages and is moved in a direction that opposes or follows the biasing means by the selector that is in the operating position when the selection plate swings based on the rotation of the cam member; and a transmission means for transmitting the moving direction and amount of movement of the moving plate to the print head as rotational motion, and appropriately selecting a selector of the selection plate to change the moving direction and amount of movement of the moving plate as appropriate. A typewriter character selection mechanism that selects a character on the print head by using the button. 2. The movable plate is provided so that both ends thereof move linearly forward along a plane parallel to a plane including the swinging motion of the selection plate, and the transmission means are provided at both ends of the movable plate. a rack that meshes with the rack, a pinion that meshes with the rack, a pulley that is fixed to the rotating shaft that supports the pinion, a pulley that is fixed to the rotating shaft that attaches the print head, and a winding between the two pulleys. 2. A character selection mechanism for a typewriter according to claim 1, wherein the character selection mechanism is constituted by a wire member having a cylindrical shape.