JPS6122113B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a winding device for a roll screen which is used for curtain blinds, projection screens, etc. and is of a roll-up storage type.

Winding devices for storing sheets such as curtain blinds and projection screens are usually installed near the ceiling, so they must be able to be rolled up and fed out by holding the bottom edge of the sheet. It must be possible to securely lock the sheet in any position depending on the amount of incident light and the size of the screen. In this way, in order to provide a single device with contradictory functions of smooth winding and unwinding and reliable locking at any position, the conventional device disclosed in Japanese Utility Model Publication No. 54-33537, for example, The coil spring acts on the internal winding member to constantly urge the roll screen to roll up, while the winding member swings the piece away from the locking member due to centrifugal force. The structure is such that the piece is locked to the locking member by its own weight that acts when the rotation is slowed down, and the roll screen is fixed at a desired position. However, in the above-mentioned device, it is not possible to make the piece large enough due to space constraints, and the locking function becomes unstable due to large friction in the pivot part of the piece or the biasing force of the coil spring. However, the operation is cumbersome as the player has to pull and return the roll screen near the stop to lock the pieces.

In view of the problems of the conventional device, the present invention aims to provide a new device that allows smooth winding and unwinding operations and can reliably lock the roll screen in a predetermined position. The details of the present invention will be explained based on the drawings.

FIG. 1 shows an embodiment of the present invention,
Reference numeral 1 denotes a winding tube for fixing the upper end of a sheet 2 such as a curtain blind or a projection screen and rolling it up.One end of the winding tube 1, which has a length corresponding to the width of the sheet 2, is operated as described below. It is reinforced by a bottomed cylinder 3 that houses the members, and the other end is attached to the peripheral surface of an end cap 4. Reference numeral 5 denotes an end cap that covers the open portion of the bottomed cylinder 3, and from inside this end cap, a fixed shaft 6 that penetrates the bottom 3a of the bottomed cylinder 3 extends integrally in the axial direction of the rolled cylinder 1. Also, on the outside there is a support rod 7 with a non-circular cross section.
stands out. Reference numeral 8 denotes a coil spring for applying winding torque to the winding tube 1, one end of which is fixed to a spring receiving seat 9 fixed inside the winding tube 1, and the other end attached to the tip of the fixed shaft 6. It is fixed to a spring receiving piece 10 fixed to. Reference numeral 11 denotes a clutch that operates to engage and disengage a clutch plate 14 on a fixed shaft 6, which will be described later, to enable winding and unwinding. By fitting slidably into the drilled elongated hole 3b, the clutch plate is mounted so as to rotate together with the winding cylinder 1 through the bottomed cylinder 3 and to slide in the axial direction. An engagement protrusion 11b extending in the radial direction is formed protrudingly on the end face facing the engagement protrusion 14. 13 is a guide cylinder fixed to the fixed shaft 6 by a pin 15, as shown in FIG.
The end face facing the clutch 11 has a recess 13a for receiving the engagement protrusion 11b, and a recess 13a for receiving the engagement protrusion 11b.
A guide slope 13b inclined from 3a in the feeding direction of the sheet 2, and a stepped surface 13c are formed on the opposite side of the guide slope 13b. Reference numeral 14 denotes a clutch plate which is rotatably attached to the circumferential surface of the guide cylinder 13 and which cooperates with the guide cylinder 13 to engage and disengage the clutch 11, which can be collectively referred to as a "clutch member". A fixing pin 15 of the guide tube 13 is fitted into an elongated hole 14a drilled on its circumference, thereby restricting the rotation range. Further, on the end face facing the clutch 11, a recessed portion 14 for receiving the engaging protrusion 11b is provided.
b is formed, and from this concave portion 14b, in the winding direction of the sheet 2, a stepped portion 1 is formed which is one step lower than the end surface.
4c is formed. 17 is this clutch plate 1
A lock release sleeve that slides in the axial direction on the outer circumference of the clutch 11, and has an end face 17 facing the clutch 11.
A is formed with a flat surface that makes sliding contact with the top surface of the engagement protrusion 11b, and a rod 17b that passes through a through hole 5a formed in the end cap 5 projects from the back surface thereof. In the figure, reference numeral 12 is a coil spring interposed between the clutch 11 and the bottom 3a of the bottomed cylinder 3 to constantly press the clutch 11 against the surface of the clutch plate 14, and 16 is a coil spring with one end connected to the end cap 5 and the other end. is a coil spring fixed to the back of the clutch plate 14, which always biases the clutch plate 14 in the winding direction of the sheet 2, 18 is a spring that constantly presses the lock release sleeve 17 toward the clutch 11, and 6a is a fixed shaft. Prevent 6 from jumping out. c-ring; 8a is a rod that prevents the coil spring 8 from deflecting; 4a is a support shaft that protrudes from the surface of the end cap 4 and is held by a bracket (not shown); 19 is a non-circular cross section that protrudes from the surface of the end cap 5; The brackets that hold the support rods 7 of 2 in a non-rotatable manner are shown in each case.

In the embodiment described above, first, the non-circular support rod 7 protruding from one side of the main body is attached to the bracket 1.
9, the fixed shaft 6 is fixed so as not to rotate, and the support shaft 4a protruding from the other side is rotatably mounted on a bracket (not shown).

When the sheet 2 is fed out by pulling the string 2a under such an attached state, the winding tube 1 begins to rotate in the direction of tightening the coil spring 8, and this rotation a causes the bottomed cylinder 3, It is transmitted to the clutch 11 through the elongated hole 3b and the pin 11a, and the engaging protrusion 11b on the end surface thereof slides onto the stepped surface 14c of the clutch plate 14, as shown in FIG. When the sheet 2 is further fed out, the engagement protrusion 11b pressed by the coil spring 12
The lock release sleeve 17 is pressed against the spring 18.
FIG. If you let go of the string 2a in this state, the seat 2 will stop at that position, but if you pull the string 2a further,
The rotation of the clutch 11 causes the engagement protrusion 11b and the recessed portion 1
4b to the clutch plate 14, the clutch plate 14 resists the coil spring 16 and engages the clutch 1.
1, and as a result, the engaging protrusion 11b
The tip of the guide cylinder 13 slides on the guide slope 13b and is pushed back to the right in the figure (FIG. 5C). When the sheet 2 is further fed out and the engagement protrusion 11b again rests on the end surface of the clutch plate 14, the clutch plate 14 disengaged from the protrusion 11b moves in the direction of arrow b due to the biasing force of the coil spring 16. At the same time, the lock release sleeve 17 is also pushed by the spring 18 and returns to its original state as shown in FIG. 5D. Therefore, string 2a
If you continue to pull , the above-mentioned operation will be performed continuously and the sheet 2 will be pulled out smoothly.

If you want to stop the sheet 2 at a desired position, just slow down the feeding speed of the sheet 2 near that point.
As a result, the engagement protrusion 11b falls into the concave portion 14b, and the two receive the winding torque of the coil spring 8 and are securely engaged. Therefore, the winding cylinder 1, which rotates together with the clutch 11, is locked, and the sheet is locked in a predetermined position.

When rolling up the sheet 2 from this state, first pull the string 2a slightly to return it to the state shown in FIG. 5D. Next, when the hand is released or loosened from the string 2a, the winding tube 1 begins to rotate in the opposite direction due to the large torque of the tightly wound coil spring 8. As a result, the clutch 11 also rotates, and its engaging protrusion 11b slides on the end surface of the clutch plate 14 to come to the position shown in FIG. 6A. As mentioned above, the clutch 11 is connected to the clutch plate 1 by the coil spring 12.
Since the clutch 11 is pressed in the direction 4, the engaging protrusion 11b will fall toward the concave portion 14b at the next point in time, but once the clutch 11 has inertia in the winding direction, it will continue to rotate. Therefore, the engaging protrusion 11b jumps over the concave portion 14b and falls onto the stepped surface 14c, as shown in FIG. From then on, this operation is repeated until sheet 2
is rolled up.

If you want to stop sheet 2 in the middle of this, please use string 2.
If you hold a and slow down the winding speed, coil spring 1
The pressing force of 2 exceeds the rotational inertia of the clutch 11, and the engagement protrusion 11b falls into the recess 14b and becomes locked.

If the coil spring 8 is tightened to the limit and the lock cannot be released again when the seat 2 is fully pulled out and locked in the state shown in FIG. When the rod 17b of the lock release sleeve 17 that protrudes through the through hole 5a of the cap 5 is pushed in the direction of arrow c, the end surface of the sleeve 17 pushes the tip of the engagement protrusion 11b and prevents it from engaging with the recess 14b. Unlock it and the lock will be released.

Note that the lock release sleeve 17 provided in the above-described embodiment can be omitted by installing a coil spring 8 so that there is some margin for tightening even when the seat 2 is fully pulled out. .

As described above, according to the present invention, a protrusion and a recess are formed on each end face of the clutch member on the fixed shaft and the clutch member of the winding tube, and the end face is formed in a portion adjacent to the recess in the sheet winding direction. A low stepped portion is formed, a guide slope is formed to disengage the protrusion and the recess in the sheet feeding direction, and this guide slope is always covered with a covering member, and the guide slope is exposed only when the sheet is fed, and the recess is formed. Since the engagement between the and the convex part is released, when the sheet is fed out, the two do not engage with each other due to the guide slope, and when the sheet is rolled up, the protrusion jumps over the concave part. If the rotation of the winding cylinder is loosened, the protrusion and the recess will engage, and the winding force of the spring member will be reduced. This state is ensured by the mechanism, and the sheet can be stopped at a desired position.The simple structure of simply providing the above-mentioned shape on the end faces of both clutches allows the winding of a roll screen, etc.
Allows for reliable feeding and stopping.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a device showing an embodiment of the present invention, Fig. 2 is a side view showing its essential parts in cross section, Fig. 3 is a view showing its installation state, and Fig. 4 is its essential parts. FIGS. 5-1 are explanatory diagrams showing the sheet feeding operation, and FIGS. 6-6 are explanatory diagrams showing the sheet winding operation. 1... Rolling tube, 2... Sheet, 3... Bottomed cylinder, 6... Fixed shaft, 8... Coil spring, 1
1...clutch, 11b...engaging protrusion, 13...
Guide cylinder, 13b... Guide slope, 14b... Concave portion, 14c... Step portion, 17... Lock release sleeve, 19... Bracket.

Claims (1)

[Claims] 1. A winding tube for a sheet-like material whose one end is rotatably supported by one external support member, and a winding tube which is unrotatably supported by the other external support member and whose inner end is rotatably supported by one external support member. In the winding device, the winding device includes a shaft member that extends in the winding direction, and a panel member that has one end fixed to the winding tube and the other end to the shaft member to rotationally bias the winding tube in the winding direction. A clutch having a convex portion on its end face and a clutch having a concave portion on its end face are removably mounted facing each other on the winding tube and the shaft member, respectively, and the recess is provided on the end face of the clutch on the shaft member. A guide slope for disengaging is formed on the side surface on the sheet feeding side, a step portion lower than the end surface is formed on the side surface on the rolling-up side of the recess, and the clutch on the shaft member is provided with a guide slope for dropping directly from the end surface into the step portion. A winding device for a roll screen or the like, characterized in that a member is fitted that covers the guide slope and rotates in a direction to expose the guide slope when it comes into contact with the side surface of the convex portion.