JPH09278295A - Roll curtain - Google Patents

Abstract

PROBLEM TO BE SOLVED: To release a lock even if a ratchet mechanism for a roll curtain is locked when the curtain is spread fully. SOLUTION: A curtain 2 can be locked in an optional spread position or can be released from the locked condition via a special cam ratchet mechanism 14. An operation part 28 integrally formed in a pawl 26 serving as a ratchet tooth is protruded to the outside from an oblong hole in a bearing case 15. If a lock cannot be released, the lock can be forcibly released when the operation part 28 is operated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll curtain, and more particularly to a roll curtain suitable for being installed inside a window of an automobile, forcibly unlocking the curtain when the curtain is fully pulled out and locked. The present invention relates to a device provided with an operating mechanism for doing.

[0002]

2. Description of the Related Art Recently, there is a considerable need to provide a roll curtain, which is installed inside a window of an automobile to block sunlight coming into a vehicle compartment or to adjust the amount of light. Therefore, the applicant of the present application has proposed, in the previous application (Japanese Utility Model Laid-Open No. 1-68368), an automobile sunshade device suitable for being installed inside the sunroof of an automobile. This sunshade device includes a shade body made of cloth, a take-up shaft to which a base end portion of the shade body is fixed and which is urged to wind the shade body, and a shade body which is drawn to an arbitrary length. It has a special cam / ratchet mechanism capable of locking and unlocking the take-up shaft.

The cam / ratchet mechanism includes a ratchet wheel, a pawl capable of locking the ratchet teeth,
It has a cam mechanism for switching the pawl between the locked position and the unlocked position. This cam mechanism includes a cam body, a control cam, a stopper that regulates a rotation range of the control cam, a mechanism that regulates a relative rotation range of the cam body and the control cam, and a ratchet for the control cam and the cam body. It is composed of a disc spring or the like that biases the wheel. The cam body has a notch portion that enables engagement between the ratchet wheel and the pawl, and an arcuate cam surface that disables engagement, and is rotatably supported by the winding shaft and the ratchet. It is configured to frictionally engage the end surface of the wheel. The control cam has a notch portion that enables engagement between the ratchet wheel and the pawl, and an arcuate cam surface that disables engagement, and is rotatably supported by the winding shaft and has a cam body. Is frictionally engaged with the end surface of the cam member and is attached so as to be relatively rotatable with respect to the cam body between a position where both notch parts are aligned and a position where they are not aligned.

FIG. 14A to FIG. 14C according to the embodiment of the present application.
(E) is an operation explanatory view of the cam / ratchet mechanism corresponding to FIG. 11 of the publication, and shows the ratchet wheel 1
3, a pawl 26 biased by a spring, a cam body 22, a cutout portion 41 thereof, a projection 43 of the cam body 22, a control cam 23, cutout portions 35 and 36 thereof, projections 39 and 40 of the control cam 23, The stoppers 31, 32, the pull-out direction a, and the winding direction b are shown. As shown in FIG. 14 (a), when the shade body is wound to the maximum extent,
The projection 39 is locked by the stopper 31, the projection 43 is locked by the end portion of the cutout portion 36, and the cutout portions 35 and 41 are aligned with each other and deviated from the pawl 26.

When the shade main body is pulled out in the pulling-out direction a, the cam body 22 and the control cam 23 rotate in the same direction due to the friction between the ratchet wheel 13 and each other, and the pawl 26 is moved as shown in FIG. 14 (b). It becomes possible to engage with the teeth 13a of the ratchet wheel 13. When pulling out further, the projection 40 of the control cam 23 engages with the stopper 32 fixed to the bearing case, so that the control cam 23 stops and only the cam body 22 rotates in the same direction as the ratchet wheel 13. When it is further pulled out, the projection 43 of the cam body 22 comes into contact with the end edge of the cutout portion 36 of the control cam 23 as shown in FIG. Since the ratchet wheel 13 is only frictionally engaged, it is possible to pull out the shade body of a desired length. Then, when the shade body is stopped, if the shade body is slightly wound in the winding direction b, the cam body 22 and the control cam 23 integrally rotate from the state of FIG. 14C,
The protrusion 39 of the control cam 23 comes into contact with the stopper 39 of the bearing case to stop, and the state shown in FIG. 14D is reached. Further, only the cam body 22 rotates and the cutout portion 41 of the cam body 22 and the control cam 23 move. The state shown in FIG. 14A in which the notch portion 35 is aligned is obtained. When the shade main body is pulled out a little from this state, the state shown in FIG. 14 (b) is obtained, so that the pawl 26 is released from the shade main body and the pawl 26 is engaged with the teeth 13a of the ratchet wheel 13 to obtain the state shown in FIG. 14 (e). Can be locked.

In the cam / ratchet mechanism of the sunshade device disclosed in the above publication, when the number of teeth of the ratchet wheel is small and the pitch between the teeth is large, the shade main body can be stopped at any withdrawal position. Is difficult Therefore, it is desirable to increase the number of teeth of the ratchet wheel to make the interdental pitch finer.

[0007]

In a roll curtain to which the above-mentioned cam / ratchet mechanism is applied, when the number of teeth of the ratchet wheel is increased and the inter-tooth pitch is made fine, the pawl is ratcheted with the curtain fully drawn out. It may engage with teeth and become locked. But,
In order to unlock the curtain, it is necessary to pull out the curtain a little, so there is a problem that if the curtain is fully pulled out and the curtain is locked, the lock cannot be unlocked.

In the sunshade device of the above publication,
Since the case member surrounding the cam / ratchet mechanism is provided, and the pair of support shaft portions of the pawl member are pivotally supported by the pair of U-shaped pivot portions formed on the inner surface side of the peripheral wall of the case member. There is also a problem that the axial size of is increased.
An object of the present invention is to solve the above-mentioned problems, to forcibly enable unlocking when unlocking is not possible, to downsize the case member, and to provide a roll curtain with improved assemblability.

[0009]

A roll curtain according to a first aspect of the present invention includes a flexible curtain, a winding shaft which is fixed to a base end portion of the curtain and is biased in a winding direction of the curtain, and the winding shaft. A ratchet wheel fixed to the winding shaft at least on one end side of the winding shaft and having a plurality of teeth on the outer circumference, and a ratchet wheel that is engageable with the teeth of the ratchet wheel and is urged to rotate in the engaging direction to wind the winding shaft when engaged. It has a pawl member including a pawl that stops rotation in the take-up direction, a notch that enables engagement between the ratchet wheel and the pawl, and an arcuate cam surface that disables engagement, and is rotatable about the take-up shaft. And a cam body that is frictionally engaged with the axially orthogonal end surface of the ratchet wheel, a notch portion that enables engagement between the ratchet wheel and the pawl, and an arcuate cam surface that disables engagement. Rotatably supported on the take-up shaft and A control cam that is frictionally engaged with the end surface of the cam body and is rotatable relative to a position where both the notches match the cam body and a position where the notches do not match, and the rotation range of the control cam. A case member surrounding the ratchet wheel, the pawl member, the cam body, and the control cam, and a release member for releasing the engagement between the pawl and the ratchet wheel, the pawl member being a case member. The release member is rotatably supported inside, and the release member is provided with an operation portion for forced release that protrudes outward from an elongated hole formed in the case member.

A ratchet wheel is fixed to a winding shaft that is urged to rotate in the direction of winding the curtain, and when the pawl is engaged with the teeth of the ratchet wheel, the winding shaft is locked. When the cutout portion of the cam body and the cutout portion of the control cam are aligned and correspond to the pawl, the pawl can be engaged with the teeth of the ratchet. When the notches are not aligned with each other, the circular cam surface of the cam body and the circular cam surface of the control cam form a circular cam surface, so that the pawl cannot engage with the ratchet teeth. Even when the notches are aligned at positions that do not correspond to the pawl, the pawl cannot engage with the ratchet teeth. As described in the section of the prior art, by cooperation of the cam body, the control cam and the stopper, the curtain is pulled out and stopped at a desired position, or the stopped state is released to wind the curtain. It can be wound around.

Here, since the pawl member is rotatably supported in the case member, and the releasing member is provided with an operation portion for forcibly releasing it which protrudes to the outside from the long hole formed in the case member, the curtain. Even if it is locked in the state in which it is fully pulled out, the lock can be forcibly released by manually operating the operating portion provided on the release member to disengage the pawl from the teeth of the ratchet wheel by the release member. Further, since the lock can be forcibly released in this way, the tooth pitch of the ratchet wheel can be formed finely. The roll curtain according to claim 2 is according to claim 1.
In the invention, the pawl member includes a release member. Therefore, the number of parts is reduced,
Assembly is simplified.

According to a third aspect of the present invention, in the roll curtain according to the first or second aspect, a long groove is formed in the inner surface of the outer end wall of the case member on the outer side in the curtain width direction, and the peripheral wall of the case member is formed. A U-shaped pivot portion is formed at an open inner end side portion of the inner surface portion of the, and a pair of support shaft portions of the pawl member are pivotally supported by the long groove and the U-shaped pivot portion. It is a feature. When assembling the pawl member, it is possible to move the one support shaft portion along the long groove while mounting the other support shaft portion to the U-shaped pivot portion.
The assembling property of the pawl member can be improved. Since the long groove can be formed by effectively utilizing the range of the thickness of the outer end wall of the case member on the outer side in the curtain width direction, the size of the case member in the curtain width direction can be reduced, and the roll curtain can be downsized. it can. Other claim 1 or claim 2
It has the same function as.

A roll curtain according to a fourth aspect of the present invention is the roll curtain of the third aspect of the invention, wherein the long groove is a guide groove portion for guiding the support shaft portion of the pawl member at the time of assembly and a circular groove for pivotally supporting the support shaft portion of the pawl member. It has a pivot groove portion and a narrow groove portion formed in a narrow width at a boundary portion between the guide groove portion and the pivot groove portion, and the support shaft portion of the pawl member pivotally supported by the long groove passes through the narrow groove portion. It is characterized by having a narrow portion that can pass through and a wide portion that cannot pass through the narrow groove portion. When the pawl member is assembled, one support shaft portion is inserted into the guide groove portion, and the narrow width portion of the support shaft portion passes through the narrow width groove portion and moves to the pivot support groove portion. After that, if the posture of the pawl member is changed to the posture in the operating state after assembly and the pair of support shafts is changed to the rotating posture in the operating state, the wide part of the support shaft cannot pass through the narrow groove part. And is pivotally supported in the pivot groove. In this way, it is possible to secure the function of pivotally supporting one of the support shaft portions at a predetermined position while easily assembling the pawl member via the long groove.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. The present embodiment is an example in which the present invention is applied to a roll curtain that is installed inside a window on the side of an automobile to block sunlight and adjust the amount of light. As shown in FIGS. 1 to 3, a roll curtain 1 includes a curtain 2 made of a flexible cloth, and a winding shaft 3 for winding the curtain 2 to which the base end of the curtain 2 is fixed.
A shaft member 4 inserted into the winding shaft 3, and a shaft member 4
The torsion spring 5 for urging the winding shaft 3 in the winding direction with respect to
A shock-absorbing member 6 made of synthetic resin that is fitted over the shaft member 4 to mitigate the collision noise with the torsion spring 5, a cover 7 that covers the outside of the upper half of the winding shaft 3, Ratchet member 10 provided on the left end side portion of the take-up shaft 3 and forming a part of the take-up shaft 3.
A cam ratchet mechanism 14 including the ratchet wheel 13 of the ratchet member 10, a bearing case 15 surrounding the outside of the cam ratchet mechanism 14, a bearing case 16 on the right end side of the winding shaft 3, and the like. . It should be noted that the cover 7 has a structure for attaching the roll curtain 1 to the vehicle body.
A pair of fittings 7a is fixed.

At the tip of the curtain 2, a core material 2a as a weight and an operating portion is attached. Winding shaft 3
Is composed of a tubular body 17, a ratchet member 10 fixed to the left end of the tubular body 17, and a bearing member 18 fixed to the right end of the tubular body 17, and the left end side portion of the winding shaft 3 is a shaft member. 4 is rotatably supported, and the right end portion of the winding shaft 3 is rotatably fitted outside the shaft portion 16a of the bearing case 16.
The ratchet member 10 is rotatably inserted through the shaft member 4, and the flat portion 4a at the left end of the shaft member 4 is non-rotatably fitted to the boss portion 15a of the bearing case 15. The left end of the torsion spring 5 is non-rotatably connected to the winding shaft 3, the right end of the torsion spring 5 is fixed to the right end of the shaft member 4, and the right end of the shaft member 4 is free. It's at the edge.

In this way, the winding shaft 3 is biased in the winding direction (the direction of arrow B in FIG. 1) by the torsion spring 5, so that the curtain 1 can be automatically wound from the maximum expanded state. . The bearing cases 15 and 16 are respectively formed with arcuate grooves 19 and 20 for receiving the ends of the cover 7. The left end of the cover 7 is inserted into the arcuate groove 19 and the right end of the cover 7 is inserted into the arcuate groove 20. With the bearing case inserted,
16 is fixed to the cover 7 with screws, and the space between the left and right bearing cases 15 and 16 is maintained at a predetermined space. still,
A guide portion 15d for guiding the left end portion of the curtain 2 is integrally formed on the lower portion of the bearing case 15, and the bearing case 1
A guide portion 16d for guiding the right end portion of the curtain 2 is integrally formed on the lower portion of the guide 6.

Next, the structure of the cam / ratchet mechanism 14 will be described. As shown in FIG. 2, the ratchet member 1
0 has a shaft portion 11, a flange portion 12, and a ratchet wheel 13 formed by forming a plurality of teeth 13a on the outer peripheral portion. On the left side of the ratchet wheel 13, a flanged sleeve 21 is externally fitted to the shaft member 4, and the flanged sleeve 21 has a cam body 22 adjacent to the left side of the ratchet wheel 13 and a control adjacent to the left side of the cam body 22. The cam 23 and the cam 23 are rotatably fitted on the outside. A disc spring 24 for urging the cam body 22 and the control cam 23 toward the ratchet wheel 13 is also externally fitted to the collared sleeve 21,
The disc spring 24 is received by the collar portion 21a of the collared sleeve 21. A plurality of slits in the axial direction are formed in the sleeve 21 with a collar, and when the cam body 22, the control cam 23 and the disc spring 24 are externally fitted, the gap between the slits is reduced to reduce the gap of the collar portion. The diameter is reduced to allow external fitting.

As shown in FIGS. 2 and 4 to 7, the pawl member 25 includes support shaft portions 27a and 27b pivotally supported by the bearing case 15 and teeth 1 of the ratchet wheel 13.
A pawl 26 that can be engaged with the tooth 3a and has a width equal to or larger than the total width of the teeth 13a, the cam body 22, and the control cam 23;
An elongated hole 29 of the bearing case 15 extending leftward from the pawl 26
The operation portion 28 for forced release that protrudes from the outside is integrally formed. The pawl member 25 is a torsion spring 30.
Is urged to rotate in the direction of engaging with the tooth 13a.
In the present embodiment, the pawl member 25 is also used as a release member for releasing the engagement between the pawl 26 and the ratchet wheel 13.

As shown in FIGS. 4, 8 and 9, two stoppers 31, 32 having an opening angle of about 120 degrees are formed on the inner surface of the outer end wall 15b of the bearing case 15 on the outer side in the curtain width direction.
Are formed. A long groove 33 for guiding and supporting the support shaft portion 27a of the pawl member 25 is formed on the inner surface portion of the outer end wall 15b of the bearing case 15. A long hole 29 through which the operating portion 28 is inserted is formed in the outer end wall 15b. A U-shaped pivotal support portion 34 that supports the support shaft portion 27b of the pawl member 25 is formed at the open inner end side portion of the lower inner surface portion of the peripheral wall 15c of the bearing case 15.

Support shaft portions 27a, 27b of the pawl member 25
Is formed into a flattened non-circular cross section by deleting both sides of the circular cross section, and the maximum diameter of the support shaft portions 27a and 27b is D and the minimum diameter is d (see FIG. 7). The long groove 33 is a guide groove portion 3 in a substantially vertical direction that guides the support shaft portion 27a during assembly.
3a, a circular pivot groove 33c located on the lower end side of the guide groove 33a and pivotally supporting the support shaft 27a, and these groove portions 33 at the boundary between the guide groove 33a and the pivot groove 33c.
narrow groove portion 33 formed to be narrower than a and 33c and smaller than the maximum diameter D of the support shaft portion 27a and permitting passage of the minimum diameter d.
b. The guide groove portion 33a is formed in a taper shape that narrows from the upper end thereof toward the narrow groove portion 33b, and the pivotally supporting groove portion 33c is formed in a size capable of rotatably accommodating the support shaft portion 27a.

The U-shaped pivot 34 has a pivot groove 33.
A pivot hole 34c that faces c and a narrow cutout portion 34b that faces the narrow groove portion 33b and has the same shape as the narrow groove portion 33b are formed. The long hole 29 formed in the outer end wall 15b of the bearing case 15 has an arcuate arc hole 29b centered on the pivotal groove 33c and an upper end of the arc hole 29b that is continuous with the guide groove 33a and is oriented in the same direction. The hole 29a. A U-shaped rib 29c for guiding one end of the torsion spring 30 is projectingly provided on the outer peripheral portion of the lower portion of the arc hole portion 29b.

The pawl member 25 is provided with the long groove 33 and the pivotal support portion 3.
9 is assembled and pivotally supported, as shown in FIG. 9A, the pawl member 25 is placed in a posture peculiar to the assembling, and the support shafts 27a and 27b are rotated peculiarly to the assembling. With the posture maintained, the operating portion 28 of the pawl member 25 is attached to the mounting hole portion 29a.
The support shaft portion 27a is positioned in the narrow groove portion 33b, and the support shaft portion 27b is positioned in the narrow width cutout portion 34b.
In this state, the support shaft portion 27a can pass through the narrow groove portion 33b and the support shaft portion 27a can pass through the narrow cutout portion 34b, so that the operation portion 28 can be moved along the assembling hole portion 29a. When the pawl member 25 is translated downward while
As shown in FIG. 9B, the operation portion 28 moves to the upper end of the arc hole portion 29b, the support shaft portion 27a moves to the pivot support groove portion 33c,
The support shaft portion 27b moves to the pivot support hole 34c.

Next, as shown in FIG. 9 (c), the pawl member 25 is rotated counterclockwise by a predetermined angle from the posture peculiar to the assembling so that the operating portion 28 is positioned below the circular arc hole portion 29b. Then, the assembling of the pawl member 25 is completed. cam·
In the operating state of the ratchet mechanism 14, the pawl member 2
The pawl 26 of No. 5 only rotates within a rotation range R of about 25 degrees, but in its operating state, the support shaft portions 27a, 27b.
Has rotated about 40 degrees or more from the rotation posture peculiar to the assembling and cannot pass through the narrow groove portion 33b and the narrow cutout portion 34b. Therefore, the support shaft portions 27a and 27b are attached to the pivot support groove portion 33.
c, it does not come off from the pivot hole 34c. The spindle 2
The portions with the smallest diameter d of 7a and 27b correspond to the narrow width portions, and the portions with the largest diameter D correspond to the wide width portions.

As shown in FIGS. 2, 10, and 11, the control cam 23 is made of a synthetic resin and has a substantially disk shape. The control cam 23 has an opening angle of about 40 for allowing the pawl 26 to engage with the teeth 13a of the ratchet wheel 13.
Degree notch portion 35, a notch portion 36 having an opening angle of about 65 degrees on the side opposite to the notch portion 35 with respect to the center, and a pawl located at an outer peripheral portion other than the notch portions 35, 36. The arcuate cam surfaces 37 and 38 are formed so that the engagement between 26 and the ratchet wheel 13 is disabled. Control cam 23
On the left end face of the projection 39 located at the end of the notch 35.
And a protrusion 40 located on the side opposite to the protrusion 39 with respect to the cutout portion 35.

As shown in FIGS. 2, 12, and 13, the cam body 22 is made of synthetic resin and has a substantially disk shape. The pawl 26 is attached to the cam body 22 by the teeth 1 of the ratchet wheel 13.
A notch portion 41 having an opening angle of about 30 degrees, which enables engagement with 3a,
An arcuate cam surface 42 that is located on the outer peripheral portion other than the cutout portion 41 and that disables the engagement between the pawl 26 and the ratchet wheel 13 is formed. One end edge of the cutout portion 41 is formed into an arcuate end edge 41a. The left end surface of the cam body 22 is formed with a projection 43 that is loosely fitted in the cutout portion 36 of the control cam 23. An annular convex portion 44 that protrudes to the right and has a narrow width in the radial direction is formed in the middle portion of the right end surface of the cam body 22 in the radial direction, and the right end surface of the annular convex portion 44 is frictionally engaged with the axially orthogonal end surface of the ratchet wheel 13. A mating annular frictional engagement surface 44a is formed.

An annular recess 46 is formed in the inner peripheral portion of the right end surface of the control cam 23, and the innermost peripheral portion of the left end surface of the cam body 22 projects leftward and has a narrow width in the radial direction. An annular convex portion 45 is formed, and a frictional engagement surface 45 a that frictionally engages with the rear end surface of the annular concave portion 46 of the control cam 23 is formed on the left end surface of the annular convex portion 45. The friction torque between the cam body 22 and the ratchet wheel 13 is set to be larger than the friction torque between the cam body 22 and the control cam 23, that is, the ratchet wheel 13 moves more than the cam body 22 follows the control cam 23. The frictional engagement surface 44a of the cam body 22 with the ratchet wheel 13 is formed on the outer peripheral side of the frictional engagement surface 45a of the cam body 22 with the control cam 23 so as to more strongly follow the operation.

The operation of the roll curtain 1 described above will be described with reference to FIG. FIG.
(E) is an operation explanatory view of the cam / ratchet mechanism 14 viewed from the left side. When the curtain 2 is pulled out, the ratchet member 10 rotates in the pulling-out direction a, and the curtain 2
When winding up, the ratchet member 10 rotates in the winding direction b. Then, when the ratchet member 10 rotates, the cam body 22 rotates following the ratchet wheel 13 within the range allowed by the notch 36, and the control cam 23 within the range allowed by the stoppers 31, 32. Then, it follows the cam body 22 and rotates.

FIG. 14 (a) shows a state in which the curtain 2 is wound up. In this state, the projection 39 has the stopper 31.
, The projection 43 is locked at the end of the notch 36, and the notches 35 and 41 are aligned with each other and deviated from the pawl 26. When the curtain 2 is pulled out in the pull-out direction a, the cam body 22 and the control cam 23 rotate in the same direction due to the friction between the ratchet wheel 13 and each other, and the pawl 26 moves the ratchet wheel 13 as shown in FIG. 14B. Can be engaged with the tooth 13a. When pulling out further, the projection 40 of the control cam 23 engages with the stopper 32 fixed to the bearing case, so that the control cam 23 stops and only the cam body 22 rotates in the same direction as the ratchet wheel 13. When it is further pulled out, the projection 43 of the cam body 22 comes into contact with the end edge of the cutout portion 36 of the control cam 23 as shown in FIG. Since the ratchet wheel 13 is only in frictional engagement, the desired length of curtain 2 can be pulled out.

When stopping the curtain 2,
When the curtain 2 is slightly wound in the winding direction b, FIG.
From the state of (c), the cam body 22 and the control cam 23 rotate integrally, and the protrusion 3 of the control cam 23
FIG. 14D shows a state in which 9 is in contact with the stopper 39 of the bearing case and stopped, and only the cam body 22 further rotates to cut out the notch portion 41 of the cam body 22 and the control cam 23.
The state shown in FIG. 14A in which the notch 35 of FIG. If the curtain 2 is pulled out a little from this state, FIG.
Since the state of (b) is reached, the pawl 26 can be engaged with the teeth 13a of the ratchet wheel 13 by releasing the hand from the curtain 2 and locked as shown in FIG. 14 (e).

Since the frictional engagement surface 44a of the cam body 22 with the ratchet wheel 13 is formed on the outer peripheral side of the frictional engagement surface 45a of the cam body 22 with the control cam 23, the cam body 22 and the control cam 23 are formed. The cam body 22 and the ratchet wheel 1 rather than the friction torque acting between them.
The friction torque acting between 3 becomes larger. Therefore,
It becomes easier for the cam body 22 to follow the ratchet wheel 13 than to follow the control cam 23.

Here, the pawl 26 may engage with the teeth 13a of the ratchet wheel 13 when the curtain 2 is fully drawn out. In that case, bearing case 1
The pawl 26 can be forcibly disengaged by operating the operating portion 28 projecting to the outside of 5. in this way,
Since the pawl 26 can be forcibly disengaged, the number of teeth of the ratchet wheel 13 can be increased, the pitch between teeth can be made fine, and the curtain 2 can be stopped at an arbitrary position.

A pair of support shaft portions 27a, 27 of the pawl member 25.
Since 7b is rotatably supported by the long groove 33 and the U-shaped pivot portion 34, when the pawl member 25 is assembled, the support shaft portion 2
7a is moved along the guide groove portion 33a, the support shaft portion 27a is provided in the pivot support groove portion 33c, and the support shaft portion 27b is provided in the support hole 34.
Since it can be mounted on c, the assembling property of the pawl member 25 can be enhanced. Since the long groove 33 can be formed by effectively utilizing the thickness range of the outer end wall 15b of the bearing case 15, the lateral size of the bearing case 15 can be reduced and the roll curtain 1 can be downsized.

The long groove 33 has a guide groove portion 33a, a pivotal groove portion 33c, and a narrow groove portion 33b having a narrow width at a boundary portion thereof.
And the support shafts 27a, 27b are provided with the narrow groove portion 33b and the narrow cutout portion 3 only in a state in which the support shaft portions 27a and 27b have a peculiar rotational posture during assembly.
Since the pawl member 25 is assembled in a non-circular cross section that can pass through the shaft 4b, the support shafts 27a and 27b are rotated in specific postures. Then, the support shaft portions 27a and 27b are assembled by passing through the narrow groove portion 33b and the narrow cutout portion 34b, and then the pawl member 25 is rotated from a posture peculiar to the assembly. The portions 27a and 27b are the narrow groove portion 33b and the narrow cutout portion 34.
b cannot be passed, and the pivot groove 33c and the pivot hole 34c
Is pivoted to. In this way, the pawl member 25 can be easily assembled through the long groove 33 while the support shaft portions 27a, 2a
7b can be pivoted in place.

The above embodiment is merely an example, and is, for example, a release member for forcibly releasing the engagement between the pawl 26 and the ratchet wheel 13 and separate from the pawl member 25. The release member may be provided, and an operation portion corresponding to the operation portion 28 may be formed on the release member. In addition, it goes without saying that various modifications can be made to each component and each mechanism without departing from the spirit of the present invention.

[0035]

According to the roll curtain of claim 1,
A releasing member is provided for releasing the engagement between the pawl and the ratchet wheel, the pawl member is rotatably supported in the case member, and the releasing member projects outward from a long hole formed in the case member. Since the operation unit for forced release is provided, when the curtain is locked with the entire amount pulled out, by manually operating the operation unit provided on the release member, by removing the pawl from the teeth of the ratchet wheel, It can be forcibly unlocked. Further, since the lock can be forcibly released in this way, the tooth pitch of the ratchet wheel can be formed finely. Therefore, the curtain can be stopped at an arbitrary position. In the roll curtain according to the second aspect, the same effect as that of the first aspect is obtained, but since the pawl member includes the release member, the number of parts is reduced, the mechanism is simplified, and the assembly is easy.

In the roll curtain of claim 3, the same effect as that of claim 1 or 2 is obtained, but a long groove is formed in the inner surface of the outer end wall of the case member on the outer side in the curtain width direction. A U-shaped pivot portion is formed at an open inner end side portion of an inner surface portion of the peripheral wall portion of the case member, and a pair of support shaft portions of the pawl member are rotatably movable between the long groove and the U-shaped pivot portion. Since it is pivotally supported, when assembling the pawl member, it is possible to move the one support shaft portion along the long groove while mounting the other support shaft portion to the U-shaped pivot support portion. The assembling property can be improved. Since the long groove can be formed by effectively utilizing the range of the thickness of the outer end wall of the case member on the outer side in the curtain width direction, the size of the case member in the curtain width direction can be reduced, and the roll curtain can be downsized. it can.

In the roll curtain of claim 4, the same effect as that of claim 3 is obtained, but the long groove serves as a guide groove part for guiding the support shaft part of the pawl member at the time of assembly and a support shaft part of the pawl member. A circular pivot groove for pivoting, and a narrow groove portion formed in a narrow width at the boundary between the guide groove portion and the pivot groove portion, and the supporting shaft portion of the pawl member pivotally supported in the long groove, Since it has a narrow width portion that can pass through the narrow width groove portion and a wide width portion that cannot pass through the narrow width groove portion, the narrow width portion of one support shaft portion moves through the narrow width groove portion to the pivot support groove portion, and then If the posture of the pawl member is changed to the posture in the operating state and the pair of support shafts is changed to the rotational posture in the operating state, the wide portion of the support shaft portion cannot pass through the narrow groove portion, and Be pivoted. In this way, it is possible to secure the function of pivotally supporting one of the support shaft portions at a predetermined position while easily assembling the pawl member via the long groove.

[Brief description of drawings]

FIG. 1 is a perspective view of a roll curtain according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a left end side portion of a roll curtain.

FIG. 3 is a vertical sectional view of a right end side portion of the roll curtain.

FIG. 4 is a right side view of a left bearing case and the like.

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is a front view of a pawl member.

FIG. 7 is a left side view of the pawl member.

FIG. 8 is a perspective view of a main part of a bearing case.

9 (a) to 9 (c) are explanatory views of each assembling state when assembling the pawl member.

FIG. 10 is a left side view of the control cam.

FIG. 11 is a front view of a control cam.

FIG. 12 is a left side view of the cam body.

FIG. 13 is a front view of a cam body.

14 (a) to (d) are explanatory diagrams of respective operating states of the cam / ratchet mechanism in operating states.

[Explanation of symbols]

 1 Roll Curtain 2 Curtain 3 Winding Shaft 13 Ratchet Wheel 22 Cam Body 23 Control Cam 24 Disc Spring 25 Pawl Member 26 Paul 27a, 27b Support Shaft 29 Long Hole 31, 32 Stopper 33 Long Groove 33a Guide Groove 33b Narrow Groove 33c Pivot Support groove 34 Pivot 34b Narrow cutout 34c Pivot 35, 36 Notch 37, 38 Arc-shaped cam surface 39, 40 Protrusion 41 Notch 42 Arc-shaped cam surface 43 Protrusion

Claims (4)

[Claims] 1. A flexible curtain, a winding shaft to which a base end portion of the curtain is fixed, and which is urged in a winding direction of the curtain, and fixed to the winding shaft at least at one end side of the winding shaft. And a pawl member including a ratchet wheel having a plurality of teeth on its outer circumference, and a pawl that is engageable with the teeth of the ratchet wheel and is urged to rotate in the engaging direction to stop the rotation of the winding shaft in the winding direction when engaged. And a circular arc-shaped cam surface that disengages the ratchet wheel and the pawl so that the ratchet wheel can be engaged with the pawl. The ratchet wheel is rotatably supported by the take-up shaft and friction is applied to the end surface orthogonal to the axis of the ratchet wheel. The cam body has an engaging cam body, a notch portion that enables engagement between the ratchet wheel and the pawl, and an arcuate cam surface that disables engagement. The cam body is rotatably supported by the winding shaft and Frictionally engages the end face and against the cam body A control cam mounted so as to be capable of relative rotation between a position where both notches match and a position where they do not match, a stopper that limits the rotation range of the control cam, a ratchet wheel, a pawl member, and a cam body. A case member that surrounds the control cam and a release member for releasing the engagement between the pawl and the ratchet wheel are provided, and the pawl member is rotatably supported in the case member, and the release member, A roll curtain characterized in that an operation section for forcibly releasing is provided which protrudes from an elongated hole formed in the case member. 2. The roll curtain according to claim 1, wherein the pawl member includes a release member. 3. A long groove is formed in the inner surface of the outer end wall of the case member on the outer side in the curtain width direction, and a U-shaped pivot portion is provided at the open inner end side portion of the inner surface of the peripheral wall of the case member. And a pair of support shafts of the pawl member are formed with long grooves and U
The roll curtain according to claim 1 or 2, wherein the roll curtain is rotatably supported by a shape-shaped pivot portion. 4. The long groove is provided at a guide groove portion that guides the support shaft portion during assembly, a circular pivot support groove portion that pivotally supports the support shaft portion of the pawl member, and a boundary portion between the guide groove portion and the pivot support groove portion. The support shaft portion of the pawl member pivotally supported by the long groove has a narrow groove portion formed in a narrow width, and a narrow width portion that can pass through the narrow groove portion and a wide width portion that cannot pass through the narrow groove portion. The roll curtain according to claim 3, wherein: