JPS5888233A - One-way clutch - Google Patents

Abstract

PURPOSE:To simplify the construction of a one-way clutch, by allowing a pawl, which is oscillated by a rotating input shaft, to mesh with and unmesh from the output shaft. CONSTITUTION:When the input gear 1 rotates clockwise, a boss 2c is pushed by one end of a cut part 1a to rotate a pawl member 2 counterclockwise round a shaft 3a, and thus a pawl 2b is put in engagement with a ratchet 4a. Thereby the input gear 1, pawl member 2 and ratchet 4a rotate clockwise as in a single body. When the input gear 1 turns counterclockwise, the boss 2c is pushed by the other end of said cut part 1a to rotate the pawl member 2 clockwise round the shaft 3a, and now the pawl 2b is disengaged from the ratchet 4a. Accordingly the ratchet 4a is free from transmission of the rotation of input gear 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a clutch that switches the transmission of rotational force from an input shaft to an output shaft, and particularly relates to a one-way clutch that switches between transmission and non-transmission depending on the rotational direction of the input shaft. .

One-way clutches, which have been widely used in the past, are known to transmit the rotational force of the input shaft in a fixed direction to the output shaft, but their essence is that there is relative movement between the input shaft and the output shaft in a fixed direction. At this time, the input shaft and the output shaft are connected to the rotary force transmittable member 11. Therefore, the relationship between the output shaft and the input shaft is relative, and the output shaft is relative to the input shaft. The problem was that it was not possible to be completely free. In other words, with conventional one-way clutches, if some rotational force is applied to the output shaft side separately from the input shaft side, there is a risk that the rotational force will flow backwards and be transmitted from the output shaft side to the input shaft side. However, when used in a device in which a rotational force is also applied to the output shaft, such as a film winding/rewinding device of a camera, problems occur in the winding and rewinding operations.

The purpose of this invention is to eliminate the drawbacks of the conventional device.The purpose is not to rely on the relative rotational direction of the input shaft to the output shaft, but to determine whether transmission or non-transmission is caused by the absolute rotational direction of the input shaft. The object of the present invention is to provide a one-way clutch in which the rotation of the output shaft in any direction is not completely transmitted to the input shaft when the transmission is not performed.

Hereinafter, the present invention will be explained in detail based on embodiments shown in the drawings.

FIG. 1 is a perspective view showing an embodiment of the one-way clutch of the present invention. In the figure, l is an input gear, and 02, which has a notch 1a on the lower side for transmitting the driving force, is a pawl member that transmits the same rotational force of the input gear 1 to the output side, and is connected through a hole 2a. It is rotatably supported on the support shaft 3a of the claw support plate 3.

4 is an output gear, and a type gear 4 is provided on the inner peripheral surface facing the pawl member 2.
It has a. In addition, the claw 2b of the claw member 2 and the mold gear 4a
and K are formed to have a similar relationship to that used in a ratchet mechanism.

The protruding portion 2C of the pawl member 2 is inserted into the notch portion 1c of the input gear 1, and the pawl member 2 is inserted into the notch portion 1c of the input gear 1.
05 is configured to rotate around a support shaft 3a to control engagement and release of the pawl 2b of the pawl member 2 and the mold gear 4a.
is a support shaft that rotatably supports the input gear 1, the pawl support plate 3, and the output gear 4;
f, *Also, the pawl support plate 3 is supported through the curved surface SbK hole 3b, and the output gear 4 is supported through the peripheral surface 5CK hole 4b.

Next, the operation of this embodiment will be explained based on FIGS. 2(a) and 2(b). In this embodiment, the shift latch is connected when the L input gear 1 rotates in the hour hand direction, and the clutch is disengaged when the L input gear 1 rotates counterclockwise.
Fig. 2(a) shows the U-clutch connected state, and Fig. 2(b) shows the clutch disengaged state.

When the input gear 1 starts rotating clockwise (indicated by the arrow) from the state shown in FIG. The input gear 1, the pawl member 2, the pawl support plate 3, and the output gear 4 rotate clockwise (arrow B) and the pawl 2b engages with the mold gear 4a.
will rotate in the clockwise direction (arrow C) K as a unit.

In addition, even if the input gear stops rotating 10 times in this state, the claw 2b
Since the engagement between and the mold gear 4a is maintained.

Next, when the input gear rotates clockwise, the output gear 4 can start rotating without any time lag. Conversely, when the input gear l starts rotating counterclockwise (arrow D) from this state, the protrusion 2C is pushed by the other end of the notch 1m, and the claw member 2 rotates clockwise around the spindle 3a. (arrow E), the pawl support plate 3 also rotates counterclockwise, and the engagement between the pawl 2b and the mold gear 4a is released. Therefore, the counterclockwise rotation of the input gear 1 is not transmitted to the output wheels 4 at all, and on the other hand, the rotation of the output gear 40 (arrow F) is completely free. Therefore, even if some rotational force is applied to the output gear 4 at this time, it will not affect the rotation of the input gear 1. Further, according to the present invention, this state does not change even if the input gear 10 stops rotating, and is maintained until the input gear 1 starts rotating clockwise. A one-way clutch having the function of transmitting only rotation to the output side and completely disconnecting the output side from the input side when the input side rotates in the other direction can be provided with a very simple configuration. When the one-way clutch of the present invention does not transmit input rotation to the output side,
When installed in a device where some rotational force is applied to the output side from another part, such as a camera's winding/rewinding device, even if the output side is rotated by reversing the winding shaft, the input side output will not interfere with the rewinding shaft. The information can be transmitted without any problem, and the operation can be ensured.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the one-way clutch of the present invention, and Fig. 2 (1) (b) is a plan view showing main parts of the embodiment of Fig. 1. Gear, 2... Claw member, 3... Claw support plate. 4... Output gear, 4a... type gear, applicant Canon Co., Ltd.

Claims (2)

[Claims] (1) An actuating member whose attitude is controlled according to the direction of rotation of the input means, and which rotates in response to one turn of the input means, and the rotation can be transmitted to the output means according to the attitude of the actuating member. A one-way clutch consisting of a transmission means and a transmission means. (2) The one-way clutch according to claim 13, wherein the actuating member maintains its rotating position even when the input means stops rotating.