JPS5862088A - Ink ribbon take-up device - Google Patents

Abstract

PURPOSE:To feed an ink ribbon securely, by providing a specified second one- way clutch, in the title device wherein a reciprocating motion of a solenoid is transmitted to a driving roller through a one-way clutch and an ink ribbon is fed forwards by a predetermined amount at a time. CONSTITUTION:A gear 25 is fitted to a shaft 5 of the driving roller 4 for the ink ribbon 1, and the second one-way clutch 22 is fitted to a gear 26 engaged with the gear 25. In said device, (i) when the solenoid 13 performs an attracting action in response to a control signal, a connecting lever 17 is lowered in the direction of an arrow to rotate the driving roller 4 clockwise (in the direction of an arrow) through the one-way clutch 21, and the ink ribbon 1 is fed forwards in the direction of an arrow 8 by a predetermined amount. On the other hand, (ii) when the solenoid 13 is released (the one-way clutch 21 is idled), the second one-way clutch 22 prevents the roller 4 from rotating counterclockwise, so that the ink ribbon 1 is securely prevented from being fed reversely.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ink ribbon winding device for a typewriter, etc. Since the ink ribbon of a typewriter is required to be appropriately wound each time printing is performed, A mechanism that can realize a stable winding amount is required.

The simplest conventional device of this type is one in which the spool of the ink ribbon is directly rotated to wind it, but it has the disadvantage that as the winding diameter increases, the amount of winding also increases. Also, devices have been used which control the amount of ink to be taken up at a constant level even if the take-up diameter changes, or devices in which the ink ribbon is held between rubber rollers or the like and a fixed amount is taken up on a spool. However, in the former, the control of the device and 1-t is complicated, the number of parts is large, and it is large.In the latter, the drive source for the rubber roller is often a combination of a solenoid and a ratchet. When the solenoid is driven on the forward stroke, the ratchet may reverse slightly on the return stroke.In either case, the pair of crimping rollers are strongly pressed against each other, or the spool is modified to increase the load to prevent the ratchet from reversing during the return stroke of the solenoid. Preventing. However, this device also had drawbacks such as an increase in the number of parts and a complicated configuration.The present invention eliminates these drawbacks, and its purpose is to be compact, have an extremely simple construction, and be reliable. An object of the present invention is to provide an apparatus for winding an ink ribbon.The present invention will be described below along with embodiments thereof.

1 and 2 are a plan view and a front view of the ink ribbon winding device, and main parts are shown in cross section. An ink ribbon 1 is mounted from the supply side (not shown) and is wound around a spool 3 in the center via a guide roller 2. Reference numeral 4 denotes an ink ribbon driving roller, which is made of a material such as rubber having a large coefficient of friction, as shown in Fig. 3.
It is fitted and fixed to the shaft 5. 6 is a driven roller that is pressed against the drive roller 4 by the biasing force of a spring 7;
The ink ribbon 1 is sandwiched between the drive row 24 and the ink ribbon 1f due to the frictional force caused by the rotation of both! : Send in the direction of arrow 8. Reference numeral 9 denotes an L-shaped lever rotatably provided around a shaft 10 fixed to a base 11, one end of which rotatably fixes the driven roller 6, and the other end of which rotates the lever 9 in the direction of the white arrow a. A handle 12 for rotation is provided. 1
Reference numeral 3 denotes a solenoid as a driving source, which is fixed to the base 9 by screws. A lever 14 is rotatably provided around a shaft 16 fixed to the base 9, and one end is rotatably attached to the plunger of the solenoid 13 and the shaft 16.
A connecting bar 17 is rotatably attached to the other end. The other end of the connecting bar 17 is rotatably inserted into the tip of an arm 18 that is fitted and fixed to the housing 19.

2o is locked to the base eVc at one end and lever 14 at the other end.
A tension spring engaged with the solenoid 13 has a biasing force for pulling the solenoid 13, lever 14, etc. back to their original positions after the suction operation of the solenoid 13 has been performed. The housing 19 is inserted into and supported by the shaft 5, and when the arm 18 rotates in the direction of the arrow, the one-way clutch 21 converts the linear motion of the solenoid 13 into rotational motion, transmits it to the shaft 5, and rotates the linear motion of the solenoid 13 in the direction of the arrow. When rotating in the direction, it is enclosed in a structure that idles and does not transmit rotational force. A gear 25 is fixed to the lower end of the shaft 6, a gear 26 meshes with the gear 25, and the gear 26 is integrally provided with the housing 24. A one-way clutch 22 is inserted into a shaft 27 fixed to the base 11, and the one-way clutch is inserted and fixed inside the housing 24 to regulate the direction of rotation of the ζ drive roller 4 and its shaft 6. At the other end of shaft 5, 7'-! J-28 is fixedly installed,
Six pulleys 30 connected to a pulley 30 via a spring belt 25 are fixed to the end of a shaft 31, and the shaft 31 is pivotally supported by a bearing 32 press-fitted into the base 11. A reel receiver 33 is fitted and fixed to the other end, on which the reel hub 34 and spool 3 are placed, and is rotated in the same manner as the shaft 31 by means of a locking member 36. Further, a reel hub 35 having a knob 37 is provided as an upper cover of the spool 3 and the ink ribbon 1.

It is a rotating stober pipe 7 with a 3sU lever 14.

Next, the operation of this embodiment will be explained. When the solenoid 13 performs a suction operation in response to a control signal, a portion of its plunger moves as shown by the arrow. Therefore, the other end of the lever 14, which is connected to the plunger by a shaft 16,
A connecting bar 17 connected thereto for rotation in the force direction
performs a linear movement in the direction of the arrow, and further moves the arm 18 to perform a rotational movement in the direction of the force of the arrow CW. At this time, the one-way clutch 21 contained in the housing 19 integrated with the arm 18 is disposed so as to be engaged and locked with the shaft 6, so that the rotational movement of the arm 18 connects the drive roller 4 via the shaft 5. , CW force direction, the ink ribbon 1 held between a pair of driving and driven rollers is sequentially fed in the direction of arrow 8. - Since the rotation of the blade shaft 6 is simultaneously transmitted to the pulley 30 and shaft 31 via the pulley 28 and spring belt 29, the pair of spools 3 are also rotated in the direction of the arrow, and the ink ribbon is fed sequentially. 1 will be rolled up.

Next, when the solenoid 13 is released due to the control signal being OFF, the lever 14 is rotated in the counter-arrow CCW direction by the return tension spring 20 provided on the lever 14, so that the arm 18 and the housing 19 are also Arrow and anti-1c in the diagram
It rotates in the reverse direction in the cW direction, but at this time, the one-way clutch 21 in the housing 19 is not locked with the shaft 5 and merely rotates idly. Therefore, the drive roller 4 should not rotate in the opposite direction, but in reality, it is driven due to the slight frictional torque between the shaft 5 and the one-way clutch 21, the unevenness/john of the ink ribbon 1, and the slight residual tensile force of the spring belt 29. The entire system including the driven roller and the spool 3 has a slight reverse rotational force to cause the ink ribbon 1 to be fed backwards and to prevent reliable winding. This embodiment focuses on this point, and is designed to ensure reliable winding with a simple structure and without applying an overload. A one-way clutch 22 is provided which is integrated with another matching gear 26, and when the ink ribbon 1 is being fed in the forward direction as shown in FIG.
6 rotates idly in the direction of the arrow CCW and functions no different from the conventional configuration, but when the ink ribbon 1 attempts to rotate in the reverse feeding direction as described above, the one-way clutch 22 locks onto the shaft 27. to completely prevent its rotation. Therefore, the ink ribbon 1 is reliably fed in a fixed amount and taken up on the spool 3 along with the rotational movement of the solenoid 13 only during the suction operation.

As is clear from the above description, the ink ribbon winding device of the present invention is capable of realizing stable ink ribbon feeding with a simple structure, and has great effects.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an ink ribbon take-up device according to an embodiment of the present invention, FIG. 2 is a front sectional view of the main parts thereof, and FIG. 3 is a side sectional view showing the main parts of a one-way clutch. 1... Ink, -ribo/, 4... Ink ribbon drive roller, 6... Driven roller, 13...
...Solenoid, 18...Arm, %20...
...Tension (ne, 21.22...) One-way clutch, 26°26...Gear.

Claims (1)

[Claims] A pair of rollers that clamp the ink ribbon and regulate the amount of winding; an arm connected to one of the pair of rollers via a first one-way clutch; a solenoid that intermittently drives this arm; A first gear provided on the shaft of the roller and interlocking with the roller, a second gear meshed with the first gear, and a second one-way clutch coupled to the second gear. Characteristic ink ribbon winding device.