JPH0424A - Controllable one-way clutch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a mechanism for selectively branching power from rotation of a rotating shaft in one direction to one or more driven objects.

[Prior Art] In the first conventional method, a first gear 32 is fixed to a rotating rotating shaft 31 as shown in FIG. is fixed in the rotating direction and movable in the thrust direction (in the direction of the arrow in FIG. 11).
A second gear 35 that can be engaged and disengaged is provided.

However, this method has the following problems.

(2) Teeth interference when the pair of gears 32 and 35 repeatedly engage and disengage becomes a major problem, and to avoid this, the mechanism becomes larger.

(2) A large force is required to disengage the first gear 32 and the second gear 35 while transmitting driving force.

■When the first gear 32 is rotating, the second gear 3
5 to the first gear 32 is difficult.

■Using gears reduces efficiency.

As many gear trains as shown in FIG. 11 are required to branch the power from the 0-rotation shaft 31, the mechanism becomes larger.

The second conventional method uses a spring 4 wound around a rotating shaft 41 that rotates in one direction as shown in FIGS. 12 and 13.
With respect to the rotation of the rotating shaft 41 of No. 5, the drive target 42 is engaged with one end 45a of the tightened example, and the ratchet 44 for selection is engaged with the remaining one end 45b of the loose side. The movable body 47 is in a stationary state relative to the ratchet 44, and an electromagnet 48 selectively disengages the movable body 47 from the ratchet 44 by an external signal.

In this case, when the movable body 47 is engaged with the ratchet 44, the ratchet 44 also remains stationary with respect to the external shape.

Therefore, due to the rotation of the rotating shaft 41, the spring 45 engaged with the ratchet 44 is loosened, and the driving force of the rotating shaft 41 is not transmitted to the driven object.

When the movable body 47 is attracted by the electromagnet 48 and disengaged from the ratchet 44, the ratchet 44 is tightened to the rotating shaft 41 by the tightening force of the spring 45, starts rotating synchronously with the rotating shaft 41, and engages with one end 45a of the spring. The driven object 42 that is currently rotating also starts rotating in synchronization with the rotating shaft 41.

However, even with this method, the following problems occurred.

■An electromagnet 48 that generates a large force to disengage the movable body 47 from the ratchet 44 because the frictional force with the rotating shaft 41 due to the tightening force of the spring 45 is applied to the movable body 47 that is constantly engaged with the ratchet 44. Is required.

(2) When the ratchet 44 is stationary, slick slip occurs between the rotating shaft 41 and the spring 45, producing noise.

[Problem to be solved by the invention] The above-mentioned conventional technology has the following problems.

■The mechanism becomes more complicated or the overall structure becomes larger, and the number of parts increases, resulting in increased costs.

■An electromagnet that generates a large amount of force is required.

■Sound is generated.

The present invention was made to solve these drawbacks, and uses a roller clutch that does not easily generate noise during standby and operation, and by making the roller clutch controllable, it is possible to control the rotation of the rotating shaft in one direction. To provide a latch mechanism that is compact and has a simple overall configuration, making it possible to selectively branch power from rotation to one or more driven objects.

[Means for solving problem n] A conventional one-way roller clutch has one roller clutch on the outer circumference of the rotating shaft.
One or more lock shafts are arranged, and for each lock shaft, a lock member having a cam-shaped lock portion for locking the lock shaft to the rotating shaft is arranged further on the outer periphery of the lock shaft. Then, by applying a force using a spring or the like to press the lock shaft against the wedge-shaped part formed by the cam shape of the rotation shaft and the lock part, the lock member is forced in one direction of the rotation shaft, and the lock member is not rotated in the opposite direction. In this case, the locking member rotates idly.

In the present invention, the lock shaft of a conventional one-way roller clutch is controlled by an external signal to stop the rotation of a ratchet that is provided in the shape of a rotating shaft and that regulates the lock shaft in the rotational direction of the rotating shaft. By forcibly extracting the roller clutch from the wedge-shaped part consisting of a cam shape, the roller clutch is controlled and the power of the rotating shaft is selectively transferred to the locking member (and the drive object held or integrated with the locking member). ) can be communicated.

[Examples] Examples of the present invention will be described below based on the drawings. 1 to 3 show a first embodiment of the present invention, which is an example of use in a paper feed mechanism of a printer.

The rotating shaft 1 rotates in the direction of arrow A in FIG. 2 by a drive source such as a motor, and the rotation of the paper feed roller 2 and the clutch plate 3 engaged with the paper feed roller 2, which are driven objects. A ratchet 4 for controlling this is rotatably penetrated through. The clutch plate 3 is provided with a lock portion 3a. A lock shaft 5 passes through the lock portion 3a, and the lock shaft 5 is inserted into the hole 4a of the ratchet 4. The clutch plate 3 and ratchet 4 have holes, and both ends of the torsion coil spring 6 are fixed in each hole. The clutch plate 3 and ratchet 4 are connected to each other by the spring force of the torsion coil spring 6 to form a wedge-shaped portion (broken line in FIG. 3) formed by the clutch plate 30 opening 3a and the rotating shaft 1.
The lock shaft 5 inserted into the hole 4a of the ratchet 4 is always biased toward the locking side. (Directions of arrows B and C in Fig. 2) Also, the movable body 7 that is engaged and disengaged with the ratchet 4 and is in a stationary state with respect to the external shape, and the movable body 7 can be selectively moved by an external signal from the ratchet 4. There is a selection unit 9 consisting of an electromagnet 8 which is engaged and disengaged.

When the movable body 7 is engaged with the ratchet 4, even if the rotating shaft 1 is rotating, the lock shaft 5 inserted into the hole 4a of the ratchet 4 is held still by the movable body 7. Therefore, it does not bite into the wedge-shaped part formed by the locking part 3a of the clutch plate 3 and the rotating shaft 1.
The clutch plate 3 and the paper feed roller 2, which is the driven object, are stationary.

When the movable body 7 disengages from the ratchet 4, the spring force of the torsion coil spring 6 causes the clutch plate 3 and the ratchet 4 to bite into a wedge-shaped portion formed by the lock portion 3a of the clutch plate 3 and the rotating shaft 1. (in the direction of the arrow in Figure 3)
, the lock shaft 5 inserted into the hole 4a of the ratchet 4
is always energized. When the rotating shaft 1 rotates in this state, the locking shaft 5 completely bites into the wedge-shaped portion formed by the locking portion 3a of the clutch plate 3 and the rotating shaft 1, and the clutch plate 3 and the paper feed roller that is the driven object 2 starts rotating in synchronization with the rotation of the rotating shaft 1.

Further, the movable body 7 engages with the ratchet 4, and the ratchet 4
When the locking shaft 5 is stopped, the locking shaft 5 inserted into the hole 4a of the ratchet 4 stops against the rotation of the rotating shaft 1, and the wedge-shaped portion formed by the locking portion 3a of the clutch plate 3 and the rotating shaft 1 is closed. The emptying will move in the direction of exit (direction of arrow E in Figure 3).

When the lock shaft 5 is removed from the wedge-shaped portion, the rotational force of the rotary shaft 1 is no longer transmitted to the clutch plate 3, and the clutch plate 3 and the paper feed roller 2, which is the driven object, are stopped.

4 to 6 show a second embodiment of the present invention, which is a mechanism for selectively transmitting power from a rotating shaft to a cam.

Basically, the operation is the same as the above embodiment, but in this embodiment, a torsion coil spring is not used, and the lock shaft 1 is
5 is a permanent magnet, the rotating shaft 11 is a magnetic material, and the lock shaft 1
5 and the rotating shaft 11, the force that causes the lock shaft 15 to follow the rotation of the rotating shaft 11 is transferred to the lock part 13 to be driven.
The force is such that the lock shaft 15 is biased against the wedge-shaped portion formed by the rotating shaft 11 and the rotating shaft 11.

Therefore, in the first embodiment, the lock shaft 5 is biased toward the wedge-shaped portion by the torsion coil spring 6 even when the rotating shaft 1 is stopped, but in the second embodiment, the rotating shaft 11 is not rotated. The lock shaft 15 is biased toward the wedge-shaped portion only when the

Further, in the second embodiment, the clutch plate 3 and the driven object 2 of the first embodiment are made into one part, and the driven object 13 is provided with a lock portion 13a.

7 to 10 show a third embodiment of the present invention, in which the lock portion 3a of the clutch plate 3 is locked in one direction of the rotating shaft 1 in the first embodiment. In contrast, the lock portion 23a of the clutch plate 23 is locked in both directions of the rotating shaft 21 (FIG. 9).

Further, a part of the outer periphery of the hole 24 & of the ratchet 24 on the side that releases the lock between the lock shaft 25 and the clutch plate 23 becomes a protrusion 24 b and enters the lock part 23 a of the clutch plate 23 .

In addition, in case the lock shaft 25 is oblique with respect to the rotating shaft 21, the hole 24a of the ratchet 24 and the paper feed roller 22 to be driven are arranged on the lock shaft as shown in the sectional view of FIG. 25 so that both ends escape.

Furthermore, the torsion coil spring 6 of the first embodiment is not used,
As explained in the second embodiment, the lock shaft 25 is made of a permanent magnet, the rotating shaft 21 is made of a magnetic material, and the lock shaft 25 and the rotating shaft 2 are made of a permanent magnet.
Lock shaft 25 locks the rotation of rotating shaft 21 due to the suction force between
The wedge-shaped portion formed by the locking portion 23a of the clutch plate 23 and the rotating shaft 21 (the wavy line F in FIG. 9)
) is the force that urges the lock shaft 25.

In the first embodiment, the rotating shaft 1 was stopped or only rotated in the - direction, but in the third embodiment, the rotating shaft 21
stops or rotates in both directions. For example, if the object to be driven is paper feed in a printer, the paper may have to be fed in the forward and reverse directions. If the paper is fed in the forward direction using the movable body 27 and the ratchet 24 described in the first embodiment, and the paper is fed in the correct direction using the movable body 27 and the ratchet 24, the paper feeding in the reverse direction is carried out using the wedge-shaped portion shown by the dotted line G in FIG. It operates in the same way as a normal roller type one-way clutch. However, when switching between forward and reverse rotation directions, there is always a transmission loss of rotation between the rotating shaft and the clutch plate, so paper feeding in the reverse direction is only possible when accurate paper feeding is not required, such as when ejecting paper. Although this cannot be used, it is possible to perform reverse feed a little more, then use forward feed to find the position, and then perform accurate pitch feed.

[Effects of the Invention] As described above, according to the present invention, it is possible to selectively branch power from the rotation of a rotating shaft in one direction to one or more driven objects. It is possible to perform forward and reverse transmission as in the third embodiment, which was difficult to do without a motor, making it possible to create a multi-functional, compact, simpler, and quieter latch mechanism compared to other configurations. Can be provided at a very low price.

[Brief explanation of drawings]

1, 4, and 7 are perspective views of three embodiments using the controllable one-way clutch of the present invention. FIGS. 2, 5, 6, and 8 are exploded views illustrating the structure of embodiments of the present invention. FIG. 3 and FIG. 9 are plan views illustrating the locking portion of the clutch plate in the present invention. FIG. 10 is a sectional view of the third embodiment. FIG. 11 shows a first conventional example. FIG. 12 shows a second conventional example, and FIG. 13 is an exploded view for explaining the structure. b 5, 15, 25 7, l 7, 27. 8, 48 9, 36 ... Protrusion ... Lock shaft ... Torsion coil spring ... Movable body ... Electromagnet ... Selected unit or more Applicant Agent: Seiko Epson Co., Ltd. Patent Attorney Kizobe Suzuki 1 person 1, 11, 21, 31. 2, 13, 22, 34. 3, 23 3a, 13a, 23a 4, 14, 24, 44 4a, 14a, 24a 41... Rotating shaft 42... Driven object... Clutch plate... Lock part... Ratchet... Hole Fig. 2 Fig. 4 Fig. 5 Fig. 6 Fig. 10 Fig. 11 Fig. 12 Fig. 13

Claims (7)

[Claims] (1) a rotating shaft; a drive object that is rotatably provided through the shaft;
a locking member fixed to or engaged with the driven object; one or more locking portions provided on the locking member and having a cam shape that locks in one rotational direction of the rotating shaft;
A ratchet that is rotatably provided through the rotation shaft and has one or more holes, and one or more ratchets that are inserted so as to pass through the hole provided in the ratchet and the lock portion. a lock shaft, a movable body normally engaged with the ratchet, an electromagnet for disengaging the movable body from the ratchet in response to an external signal, and the lock shaft is locked between the rotating shaft and the lock portion. A controllable one-way clutch characterized by comprising a member that applies force in the direction of rotation. (2) A controllable one-way type according to claim 1, wherein a force is applied by a torsion coil spring so that the lock shaft rotates in a rotational direction in which the lock shaft is locked between the rotation shaft and the lock portion. clutch (3) A permanent magnet is used for the ratchet or lock shaft and a magnetic material is used for the rotating shaft, or a magnetic material is used for the ratchet or lock shaft and a permanent magnet is used for the rotating shaft, and one direction of the rotating shaft is used. The controllable one-way clutch according to claim 1, wherein the rotation is a rotational force that causes the lock shaft to rotate in a rotation direction in which the lock shaft is locked between the rotation shaft and the lock portion. (4) The controllable one-way clutch according to claim 1, wherein the locking member is provided on a part of the driven object. (5) The controllable one-way clutch according to claim 1, wherein a cam shape provided on the locking member is configured to lock against bidirectional rotation of the rotating shaft. (6) A portion of the outer periphery of the hole of the ratchet on the side that releases the lock between the lock shaft and the lock portion is inside the lock portion. Controllable one-way clutch (7) The controllable one-way clutch according to claim 1, wherein the diameter of the hole portion of the ratchet on the opposite side of the locking member is larger than that on the locking member side.