JPS6054192B2 - typewriter margin device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a paper support for supporting a printing paper and a printing element support provided with a printing element for printing characters relative to each other in the character feeding direction at at least two different pitches. Regarding the typewriter that was moved to

For example, a typewriter is equipped with a character feeding device that moves a carriage on which a platen is supported in the character feeding direction at at least two pitches, and one pitch can be selected. This creates a need to provide a margin J device that can be positioned at

This invention provides a plurality of margin rack members having tooth rows formed at pitches equal to each pitch of a character feeder.
A margin member that is switched to engage with any one of the tooth rows is provided movably along the margin rack member, and the printing paper support corresponds to the pitch of each tooth row of the margin rack member. A scale having graduations is integrally provided, and a switching means having an operation knob for switching the margin member to selectively engage the tooth row of any one of the plurality of margin rack members is provided. By providing an indicating means that indicates only the scale corresponding to the tooth row selected based on the switching operation of the operation knob, it is possible to very easily position the margin member using the scale, It is an object of the present invention to provide a margin device that prevents erroneous reading of the pitch scale. An embodiment of the present invention will be described below with reference to the drawings.

In the figure, reference numeral 1 denotes a carriage on which a platen 2 as a printing paper support is supported, and this is supported so as to be movable left and right on a carriage guide rail 3 fixed to the rear of the machine frame (not shown). It is always urged in the direction of arrow A, which is the character feeding direction, by a carriage urging means (not shown). 4 is a pinion that meshes with a rack 5 fixed to the carriage 1, and a rotating shaft 6 (
(Only the axis is shown) is rotatably supported on the machine frame, and a ratchet wheel 7 for pica and a ratchet wheel 8 for machine sorting, which constitute a part of the character feeding device, are fixed to this rotary shaft 6. ing.

Numerals 9 and 10 are feed pawls rotatably supported on the machine frame so as to be able to engage and disengage the ratchet wheels 7 and 8. A rotational force is applied in a direction that does not engage.

11 and 12 are also rotatably supported on the machine frame so that they can be engaged with and disengaged from the ratchet wheels 7 and 8. These retaining pawls are always given a rotational force in the direction of engagement with the teeth of the ratchet wheels 7 and 8 by a biasing means (not shown).
and 12 is forcibly held so as not to engage with the teeth of the corresponding ratchet wheel 7 or 8 against the rotation and force applied by the aforementioned biasing means. That is, when the selection means is switched to 1 pitch by the pitch selection lever (not shown), the holding claw 1
2 is rotated so that it does not engage with the ratchet wheel 8 (see FIG. 1).

In this state, when the character key or the spacer is pressed down, the feed pawl 9 and the holding pawl 11 are integrally rotated back and forth once, similar to a normal typewriter.
Based on one reciprocating rotation of the feed pawl 9 and the holding pawl 11, the ratchet 7 is rotated by one tooth in the direction of arrow B by the carriage biasing means, thereby causing the carriage 1 to rotate once in the direction of arrow A.
One character is sent at paikayo pitch j. Next, when the selection means is switched to the 1-elite position by a pitch selection lever (not shown), the holding pawl 11 is rotated so as not to engage with the ratchet wheel 7, and instead, the holding pawl 12 is rotated so as not to engage with the ratchet wheel 7.
is switched so that it can engage with the ratchet wheel 8. In this state, when the character key or spacer is pressed down in the same manner as described above, the feed claw 10 and the holding claw 12 are integrally rotated back and forth once, and based on these rotations, The carriage biasing means rotates the ratchet wheel 8'' by one tooth in the direction of arrow B, thereby feeding the carriage 1 by one character in the direction of arrow A at a pitch of one elite. 13 is attached to the machine frame in the longitudinal direction. A printing element support body is swingably supported by a printing element support body, and a drive shaft 14 is rotatably provided on this print element support body.

Reference numeral 15 denotes a spherical printing element fixed to the tip of the drive shaft 14, and a large number of printed characters 15a are arranged in rows on the outer peripheral surface of this element.

Although not shown, a character selection mechanism is provided for rotating the drive shaft 14 and tilting the printing element 15, so that when a character key is pressed, the selected character faces the platen 2. and then print element support 1
3 is swung, the selected characters 15a on the printing element 15 are struck toward the platen 2. Reference numerals 16 and 17 denote margin rack members for pica and mechanical sorting, which are located behind the platen 2 and fixed to the carriage 1 in parallel with the platen 2. A tooth row 16a is formed with a pitch equal to the character feed pitch (1 character per inch), and the lower end of the margin rack member 17 is provided with a character feed pitch (1 character per inch) of the mechanical sort. Teeth rows 17a with equal pitches are formed.

Each tooth row 16a and 17a is provided over the entire length of the printing width of the platen 2, and the margin rack member 16
is positioned rearward from the margin rack member 17 with a predetermined distance therebetween. Reference numeral 18 denotes a vapor guide disposed behind the platen 2 along the platen 2, the upper edge of which is bent rearward, and a scale 19 is printed on the upper surface of the bent portion by, for example, silk printing. It is set up.

The front end of the scale 19 is provided with a scale 19a having a pitch equal to the character feed pitch of the machine sort.
Further, at the rear end of the scale 19, there is provided a scale 19b with a pitch equal to the pica character feed pitch. 20
are two rectangular cylindrical sliding bodies (only one of which is shown) that is partially open on the front side and open at both ends, and the aforementioned margin rack members 16 and 17 are inserted along the inner surfaces of these sliding bodies. Therefore, these sliding bodies 20 are guided by the margin rack members 16 and 17 so that they can slide left and right.

Reference numeral 21 denotes a margin member, in which a shaft portion 21a is connected to the sliding body 20.
It is rotatably inserted into the space between the margin rack members 16 and 17 via an insertion hole 20a provided at the approximate center of the upper surface, and a shaft portion 21a has one engaging member protruding laterally at the lower end thereof. A matching claw 21b° is provided.

Reference numeral 22 denotes a switching means having an operating knob 23 fixed to the upper end of the shaft portion 21a by, for example, integral molding of plastic, and located between the lower surface of the boss portion 23a of the operating knob 23 and the upper surface of the sliding body 20. A compression spring 24 is disposed that is inserted through the shaft portion 21a, which ends the shaft portion 21a, so that the shaft portion 21a is always biased upward.

and the operation knob 23 is located between two parts facing each other across the boss part 23a.
Indicating lines 25 and 26 as indicating means are provided approximately at the center of each of the two side surfaces 23b and 23c, respectively. Second
As shown in the figure, the distance b from the boss portion 23a to the side surface 23c having the pointing line 26 is set to be longer than the distance a from the center of the boss portion 23a to the side surface 23b having the pointing line 25 by a predetermined length. The aforementioned engaging gourd 21b has a side surface 23c.
They are provided in a positional relationship that corresponds to the top and bottom. Therefore,
For example, when the side surface 23b having the indicator line 25 is directed toward the scale 19 (the direction facing the operator) as shown in FIGS. The shaft portion 21a is normally biased upward by the compression spring 24, so that its engaging pawl 21b is engaged with the tooth row 16a. Reference numerals 27 indicate actuating rods fixed to each of the sliding bodies 20, and when these actuate rods come into contact with actuated rods 28 provided on the machine frame, the carriage 1 is positioned at the striking end position and the striking start position. .

Note that 29 is a printing paper that is wound and supported by the platen 2. Next, the operation of this embodiment configured as described above will be explained.
When it is selected to move in the character advance direction at a pitch of 7 pica, turn the operation knob so that the side surface 23b having the indicator line 25 is directed in the direction of the scale 19, as shown in FIGS. 1 and 2. If you set 23, that instruction line 2
5 is located near the pica scale 19b provided at the rear end of the scale 19 and corresponds to the scale 19b, and the engagement claw 31b of the margin member 21 is pushed upward by the compression spring 24. The tooth row 16a of the margin rack member 16 for picas is engaged by force.

When setting the margin member 21 in this state, push down the operation knob 23 against the compression spring 24 to disengage the engagement pawl 21b of the margin member 21 from the tooth row 16a, and then turn the operation knob 23 as it is. With the slider 20 pressed down,
When the push-down operation of the operation knob 23 is released after moving the indicator line 25 from side to side to match the desired position on the scale 19b, the engaging pawl 21b of the margin member 21 engages with the opposing tooth row 16a. and is positioned at that position. Now,
Next, when the selection means (not shown) selects to move the carry button 1 in the character feeding direction at a pitch of 0, it is rotated 1800 times while pressing down the operation knob 23 of the switching means 22 from the above-mentioned state. The switching operation is performed by pressing the switch (see FIGS. 3 and 4).

That is, by rotating the operating knob 23, the side surface 23c having the indicator line 26 is set to face toward the scale 19, and the indicator line 26 is set at the front end of the scale 19 for sorting. The scale 19b is located near the scale 19a and corresponds to the scale 19a, and the scale 19b is covered by the operation knob 23. On the other hand, as the operating knob 23 rotates, the engagement claw 2 of the margin member 21
1b corresponds to the margin rack member 17 for mechanical sorting, and the margin member 21 is urged upward by the compression spring 24, so that the engaging pawl 21b is aligned with the tooth row 1.
7a, positioning of the margin member 21 is performed. In this case, when setting the margin member 21 for positioning, move the slider 20 left and right while pressing down the operation knob 23 to set the indicator line 26 at the scale 19.
It is sufficient to match the desired position on a. As described above, according to this embodiment, the switching means 22 changes the margin member 21 from the margin rack members 16 and 17 by rotating the operation knob 23.
When the margin member 21 is switched so that it can engage with one of the tooth rows 16a and 17a of the margin rack member 16 for the pica, the indicator line 25 When the margin member 21 is switched so that it can engage with the tooth row 17a of the margin rack member 17 for machine sorting, the indication line 26 corresponds only to the scale 19b for machine sorting. Since the margin member 21 is made to correspond only to the character feed pitch, it is possible to perform positioning operations very easily while matching the margin member 21 to the pitch of character feed, without causing the user to set the margin member 21 by mistake by reading other pitches that have not been selected. can.

As explained above, the present invention enables easy positioning of the margin member using the scale in accordance with the pitch of printing by the character feeder, and also prevents the user from reading the scales of other unselected pitches by mistake. It is possible to provide a typewriter margin device that does not occur.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a schematic perspective view, FIGS. 2 and 3 are enlarged sectional views of the main parts shown in different operating states, and FIG. 4 is FIG. 3. It is a perspective view of the main part shown in the same state as .

Claims (1)

[Claims] 1. A paper support that supports printing paper, a printing element support that is provided adjacent to the paper support and supports a printing element for printing characters on the printing paper, and the paper support and the printing element. A character feeding device for providing relative movement in the character feeding direction at two different pitches between the character feeding device and a selection device for selecting one of the two pitches of the character feeding device. In the typewriter, two margin rack members are provided integrally with the paper support in parallel along the character feeding direction and each have a tooth row formed at a pitch equal to the pitch of the character feeding device. a scale provided integrally with the printing paper support and having two scales corresponding to the pitch of the tooth rows of the two margin rack members; and a scale provided movably along the margin rack member. a switching means having an operating knob for switching the margin member to selectively engage the tooth row of any one of the two margin rack members; and which indicates one graduation of the scale corresponding to the operated tooth row when the margin member is engaged with the teeth row of one margin rack member based on the operation of the operation knob provided therein, and the margin member when engaged with a row of teeth on the other margin rack member, one graduation of said scale is covered by said operating knob and indicates the graduation of the other scale of said scale corresponding to the selected tooth row. A typewriter margin device consisting of an indicating means.