KR880002838Y1 - Platens - Google Patents

Abstract

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Description

Platen drive

1 is an exploded perspective view of the main part of the present invention.

2 is a combined state diagram of the present invention.

3 is a state diagram of the first gear viewed from the right.

4 is a cross-sectional view taken along the line A-A.

5 is a perspective view of the first gear.

6 is a cross-sectional view of the engaged state of the first gear and the second gear.

* Explanation of symbols for main parts of the drawings

3: tooth 4: first gear

5: internal tooth type 6: external tooth type

7: second gear 10: third gear

11, 12: square groove

It relates to a platen driving device that can buffer the residual force transmitted from the motor when the rotary knob of the platen of the electronic typewriter of the present invention is driven manually, the drive gear and the gear When the first gear and the second gear are formed separately to manually rotate the rotary knob to fit the line to cushion or offset the excessive force applied from the drive motor.

Conventionally, a gear (combination of the first gear and the second gear of the present invention) formed on the shaft of the platen is integrally formed, and when rotating the rotary knob manually to feed the line, the rotary knob If you can't press it smoothly, there is a drawback that it can't buffer and offset the excessive force applied to the gear from the driving motor. When the rotary knob is pressed, it is formed to be separated from the inner gear by opening the gear tip divided into four quarters by the inner gear engaged with the inner surface of the gear. This was not practical because the wear rate of each tooth is high and the durability of each part is not smooth.

The present invention solves the conventional problems as described above, and each gear formed on the shaft is formed as individual parts, and when the feed line is pressed by the rotary knob, the force transmitted from the driving motor is canceled and a buffering action is performed. It is designed to be, when described in detail by the accompanying drawings as follows.

A first gear 4 having four teeth 3 formed on the front surface of the shaft 2 of the platen 1 is laid out, and a second gear 7 to which the inner teeth 5 are meshed with the first gear ( Insert into the tip of 4), with claw rakes (8), (8 ') and " A third groove in which the outer grooves 11 and 12 of the outer circumference are inserted into the knobs having the protrusions 9 and 9 of the " -shape, and the inner teeth thereof mesh with the outer teeth 6 of the second gear 7. The gear 10 is fixed to the shaft 2, and the long piece 14 of the rotary knob 13 penetrates the knob and the third gear so that the outer end 7-1 of the second gear 7 and In the drawings, reference numeral 15 denotes a spring, 16 a side plate, 17 a driving motor 18, and a driving gear.

Referring to the effect of the present invention configured as described above, if you want to feed the line manually, first press the rotary knob 13 arranged on the shaft (2) for rotating the platen (1) the rotary knob ( 13 is formed in the center of the long piece 14 which penetrates the knob and the third gear 10 and is in contact with the outer edge 7-1 of the second gear 7 while maintaining a clearance 7-2 at a predetermined interval. The second gear 7 in which the inner tooth and the outer tooth 6 of the third gear 10 are engaged with each other by advancing as much as they are pressed in the state of enclosing the shaft 2 fixing the third gear 10. Pushes the outer gear 7-1 of the c) and pushes the first gear 4 in which four teeth 3 are engaged with the inner teeth 5 of the second gear 7 while being pushed as much as it is pressed. The first gear 4 is arranged so as to be inserted into the shaft 2 so that the soup held between the side plate 16 and the first gear 4 is held. Since the first gear 4 is separated from the drive gear 18 by pressing the ring 15, it is possible to rotate the hand manually while the rotary knob 13 is pressed, thereby smoothly feeding the line.

At this time, since the first gear 4 and the second gear 7 arranged on the shaft 2 are idling in a state where they are separated from the drive gear 18, the rotary knob 13 can be rotated without any influence. It is.

In this case, if the outer tooth 6 of the second gear 7 inadvertently disengages from the inner tooth of the third gear 10 by the user's carelessness, the rotary knob 13 is rotated. The four teeth (3) installed on the front of the (4) is engaged with the inner teeth (5) of the second gear (7), but the number of teeth is a small number, so that not only does not achieve a perfect state of engagement but also the third When the gear 10 rotates, the shaft 2 is integrally rotated, but the inner tooth 5 of the second gear 7 whose outer tooth 6 is conical is the four teeth 3 of the first gear 4. ), The first gear and the second gear meshed with the drive gear 18 in the state of idling, and when the rotary knob is rotated, the conical outer surface of the second gear 7 in the conical inner tooth of the third gear 10. According to the resilience of the spring 15 holding the first gear 4 as the teeth 6 are separated. Although there is a difference in frostbite, the inner tooth (5) of the second gear (7) and the four teeth (3) of the first gear (4) engaged with it are not in close contact with each other. Since the first gear 4 and the second gear 7 are offset by the anti-rotation force of the drive gear 18, the coupling force is canceled to have a shock absorbing effect.

In the present invention, only the forward and the reverse in the state in which the hook-shaped rake 8 and the protrusion 9 of the knob for forward and backward rotation, such as the rotary knob, are fitted in the angular grooves 11 and 12 of the third gear 10. Therefore, when the rotary knob is rotated, the third gear is also rotated firmly, and the long piece 14 of the knob moves in and out of the center of the third gear 10 fixed to the shaft 2, and is moved back and forth with the shaft wrapped from the outside. Therefore, it is possible to ensure the reliability and accuracy of the operation.

As described above, the first and second gears installed on the shaft are simply engaged with each other in a state of being simply laid up, and the third gear is fixed to the shaft so that the organic operation is performed by simple operation of the rotary knob. It is a very practical and useful design that allows for buffering and offsetting possible rotational suppression functions.

Claims (1)

In the electronic typewriter, a first gear 4 having four teeth 3 formed on the front surface of the shaft 2 of the platen 1 and a second gear 7 into which the inner teeth 5 are engaged. , And the claw rakes 8, 8 'and the protrusions 9 and 9' of the knobs are inserted into the grooves 11 and 12 of the outer circumference, and the rotary knob 13 The outer edge 7-1 of the second gear 7 having an outer tooth 6, which extends through the long piece 14, which surrounds the shaft fixing the third gear 10 and engages with the inner tooth of the third gear. Platen drive with a small clearance (7-2) and abutment.