阅读说明：本技术 一种用于驱动窗帘的涡卷弹簧及其成型方法 (Scroll spring for driving curtain and forming method thereof ) 是由 王永跃 于 2020-07-28 设计创作，主要内容包括：本发明提供了一种用于驱动窗帘的涡卷弹簧及其成型方法,属于弹簧技术领域。它解决了现有用于驱动窗帘的涡卷弹簧适用性差的技术问题。本用于驱动窗帘的涡卷弹簧,包括绕卷呈涡卷状的簧片,其特征在于,当所述簧片拉伸张开时该簧片的拉出部分的两边沿向一侧弯折翘起形成调矩翘边,所述调矩翘边的翘起高度沿簧片的长度方向逐渐变化并使拉出部分不同位置的扭矩逐渐变化。本用于驱动窗帘的涡卷弹簧的设计自由度高,适用性更优。(The invention provides a volute spiral spring for driving a curtain and a forming method thereof, and belongs to the technical field of springs. The technical problem that the existing volute spiral spring for driving the curtain is poor in applicability is solved. This a volute spring for driving (window) curtain, including being volute-shaped reed around rolling up, its characterized in that works as the both sides of the part of pulling out of this reed form the distance adjusting perk to the buckling perk of one side when the reed is stretched and opened, the perk height of distance adjusting perk changes gradually and makes the moment of torsion that pulls out the different positions of part change gradually along the length direction of reed. The spiral spring for driving the curtain has high design freedom and better applicability.)

1. The utility model provides a volute spring for driving (window) curtain, is including being volute reed (1) around rolling up, its characterized in that, works as the both sides of the part (2) of pulling out of this reed (1) are along warping the perk to one side and are formed moment adjusting perk (3) when reed (1) stretch opens, the perk height of moment adjusting perk (3) changes gradually and makes the moment of torsion that pulls out the part (2) different positions change gradually along the length direction of reed (1).

2. Scroll spring for driving window curtains according to claim 1, characterized in that the tilting direction of the pitch raising edge (3) and the rolling direction of the spring leaf (1) are towards both sides of the spring leaf (1), respectively.

3. Scroll spring for driving window blinds according to claim 1, wherein the pull-out portion (2) of the reed (1) has an arc-shaped cross-section.

4. Scroll spring for driving window curtains as claimed in claim 1, characterized in that the cross-section of the pull-out part (2) is U-shaped, the pitch beads (3) are arc-shaped, and the pull-out part (2) between two pitch beads (3) is flat.

5. A scroll spring for driving window blinds according to claim 1 or 2 or 3 or 4, characterized in that the pitch fins (3) on the spring leaf (1) are reset in the rolled state and are flush with the part of the spring leaf (1) between the pitch fins (3) on both sides in the width direction.

6. Scroll spring for driving window blinds according to claim 5, wherein the thickness of the leaf (1) is gradually increased from the outer ring to the inner ring.

7. A scroll spring for driving blinds according to claim 1 or 2 or 3 or 4, wherein the reed (1) is a stainless steel band or a beryllium bronze band.

8. A method of forming a spiral spring for driving a window covering as claimed in claim 1, comprising the steps of:

a. horizontally passing the planar spring steel strip between vertically opposite inserted V-shaped rollers, driving the V-shaped rollers to rotate and controlling the planar spring steel strip to synchronously feed at a low speed, and primarily bending the planar spring steel strip to enable two side edges of the planar spring steel strip to be primarily tilted;

b. horizontally passing the preliminarily processed spring steel belt between the second V-shaped rollers with larger bending degree, driving the spring steel belt to feed at low speed and simultaneously gradually reducing pressing force between the V-shaped rollers, so that the tilting degree of two side edges of the spring steel belt is gradually reduced, and resetting the V-shaped rollers to be in a high pressing force state again after the length of the processing unit is reduced gradually;

c. the processed spring steel strip is continuously fed and starts to abut against the forming cutter head and is bent and wound, and the forming cutter head gradually moves outwards in the winding process to finish the winding of the volute spiral spring.

d. The punch cutter cuts off the allowance of the spring steel band, and the formed volute spiral spring is collected into the material receiving box to be processed.

Technical Field

The invention belongs to the technical field of springs, and relates to a volute spiral spring for driving a curtain and a forming method thereof.

Background

Window coverings without operating cords have become a major development for window covering products. In the cordless window curtain, a cord connected with a curtain fabric is wound on a winding wheel, and the winding wheel can be driven by a driving mechanism to rotate, so that the cord fabric is wound on the winding wheel or released from the winding wheel, and the curtain fabric is lifted. The common driving mechanism is a flat spiral spring, which is also called a clockwork spring, and is a spring with one end fixed and the other end acted with torque, under the action of the torque, a reed of the spring generates bending elastic deformation, so that the spring generates torsion in a plane, and the size of a deformation angle of the spring is in direct proportion to the torque. When the conventional spiral spring is formed, the forming curvature radius of the bent and formed reed is gradually increased from the inner ring to the outer ring, and the smaller the forming curvature radius of the reed is, the larger the torque can be provided, so that the torque provided by the conventional spiral spring is gradually reduced from the inner ring to the outer ring.

When the curtain is driven, the outer end of the flat spiral spring is wound and fixed on a central rotating shaft parallel to the central shaft of the flat spiral spring, the central rotating shaft is in transmission connection with the winding wheel, the winding wheel is driven to rotate when the central rotating shaft rotates, and vice versa. When the curtain cloth needs to be put down, the curtain cloth can be manually pulled downwards, the pull rope can drive the winding wheel to rotate in the positive direction, the central rotating shaft is further driven to rotate in the positive direction, and the reeds of the flat spiral spring are wound on the central rotating shaft one by one; when the curtain cloth needs to be lifted, the curtain cloth is pulled downwards slightly, the flat spiral spring can drive the central rotating shaft to rotate reversely under the action of the elastic force of the flat spiral spring, meanwhile, the reeds are gradually withdrawn from the central rotating shaft one by one and retracted for winding, and the central rotating shaft drives the winding wheel to rotate reversely to recover the pull rope, so that the curtain cloth is driven to lift.

In prior art cord-less window covering constructions, when the shade is lowered to a lower position, the weight required to be supported by the drive mechanism is relatively small, at this time, most of the reeds of the spiral spring are wound on the central rotating shaft, and the formed curvature radius of the reeds positioned on the outer ring of the central rotating shaft is smaller, so that larger torque can be provided, the central rotating shaft is easy to rotate reversely, and the curtain cloth is unnecessarily lifted, conversely, when the curtain cloth is lifted to a higher position, the weight required to be supported by the driving mechanism is relatively larger, at this time, most of the reeds of the flat spiral spring are withdrawn from the central rotating shaft and retracted and wound, and the formed curvature radius of the reeds positioned on the outer ring of the central rotating shaft is larger, so that only a small torque can be provided, the weight of the curtain may not be effectively supported, resulting in unnecessary dropping of the curtain due to the gravity.

To solve the above problems, chinese patent No. CN206889541U discloses a flat spiral spring of a curtain driving device, which is formed by reversely winding a conventional flat spiral spring manufactured by a conventional process, wherein a forming curvature radius of a drawn part of a leaf of the flat spiral spring is gradually changed from an outer ring to an inner ring.

The scroll spring structure can be better suitable for the lifting drive of a curtain, but the state of the scroll spring after being reversely wound is difficult to keep stable under natural conditions, the self energy release condition is easy to occur before installation, and the workload is increased. To solve the above problems, the person skilled in the art can easily consider such as: after the planar spiral spring is reversely wound, the state of the planar spiral spring is kept stable by using the locking structure, the planar spiral spring is prevented from being released by self, and unlocking is carried out after installation is finished.

Disclosure of Invention

The present invention provides a scroll spring for driving a window curtain, which aims to solve the above problems in the prior art, and comprises: the existing volute spiral spring has poor applicability and inconvenient installation.

The purpose of the invention can be realized by the following technical scheme:

the utility model provides a volute spring for driving (window) curtain, is including the reed that is scroll-like around rolling up, its characterized in that, works as the both sides of the part of pulling out of this reed are along the perk to one side bending type when the reed is stretched and is opened and form the distance adjusting perk limit, the perk height of distance adjusting perk limit changes gradually and makes the moment of torsion that pulls out the part different positions change gradually along the length direction of reed.

The spring leaf of the scroll spring can form tilting moment adjusting raised edges at two sides in the width direction of the pulling part when the spring leaf is opened by setting, so that the pulling part of the spring leaf can release potential energy accumulated in a winding state when the spring leaf is opened by stress to supplement acting force required for driving the pulling part to be opened, thereby reducing the torque requirement of the pulling part to be opened, and further setting the pulling part of the whole scroll spring to have different sections of the tilting degree of the moment adjusting raised edges so that the torque of the pulling part of the whole scroll spring can be adjusted by the tilting degree of the moment adjusting raised edges to meet the use requirements of different torques of different stages of products, for example, the tilting degree of the moment adjusting raised edges is designed to be gradually increased from the outer ring to the inner ring under the requirement of a blind without a pull rope, so that the torque of the outer ring with a large curvature radius is reduced less, the torque of the inner ring with a small curvature radius is obviously reduced, and finally the formed scroll spring can realize that the torque is larger when the outer ring has, the inner ring has smaller curvature radius and smaller torque, so that the requirement of the retraction driving stress of the curtain is better met, the gravity generated by the gradual change of the dead weight of the curtain at different position points in the retraction process of the curtain is balanced with the gravity, and the installation is convenient without an additional locking structure.

In the above scroll spring, the tilting direction of the moment adjusting tilting edge and the rolling direction of the reed face to both sides of the reed respectively. The coiling direction of the reed is towards the inner side of the volute spiral spring, and the reed which is reset by the inner ring can be propped against the middle low part of the reed to be reset to promote the deformation of the reed to be close to a plane state or a plane state when the reed is coiled and reset by setting the moment adjusting warping edge to be warped towards the outer side of the volute spiral spring along the thickness direction.

In the above-described scroll spring, the pull-out portion has an arc-shaped cross section. The cross section of the pull-out part is arc-shaped, so that the width range of the torque adjusting warped edge is maximized, and the torque adjusting function of the pull-out part is satisfied while the warped height of the torque adjusting warped edge is kept in a proper range.

As another scheme, the cross section of the pull-out part is U-shaped, the raised edges of the moment adjusting parts are arc-shaped, and the pull-out part between the two raised edges of the moment adjusting parts is flat. The two torque adjusting raised edges are arc-shaped, the pull-out part between the two torque adjusting raised edges is flat, so that the processing difficulty of forming the volute spiral spring can be reduced, the flat pull-out part is favorable for stable conveying in the manufacturing process, and the process difficulty is reduced.

In the scroll spring, the pitch-adjusting raised edges on the reed are reset in the rolling state and are flush with the reed part between the pitch-adjusting raised edges on the two sides along the width direction. Thus, the reed can absorb energy after being rolled and reset so as to prepare for the torque change of the later pulling part.

In the above scroll spring, the reed is a stainless steel band or a beryllium bronze band. Stainless steel and beryllium bronze have good elastic property and fatigue resistance, and ensure the mechanical property of the volute spiral spring.

A method for forming a volute spiral spring for driving a window covering, comprising the steps of:

a. horizontally passing the planar spring steel strip between the vertically opposite V-shaped rollers, driving the V-shaped rollers to rotate and controlling the planar spring steel strip to synchronously feed at a low speed, and primarily bending the planar spring steel strip to enable two side edges of the planar spring steel strip to be primarily tilted;

b. horizontally passing the preliminarily processed spring steel belt between the second V-shaped rollers with larger bending degree, driving the spring steel belt to feed at low speed and simultaneously gradually reducing pressing force between the V-shaped rollers, so that the tilting degree of two side edges of the spring steel belt is gradually reduced, and resetting the V-shaped rollers to be in a high pressing force state again after the length of the processing unit is reduced gradually;

c. the processed spring steel strip is continuously fed and starts to abut against the forming cutter head and be bent and wound, and the forming cutter head gradually moves outwards in the winding process to finish the winding of the volute spiral spring;

d. the punch cutter cuts off the allowance of the spring steel band, and the formed volute spiral spring is collected into the material receiving box to be processed.

Compared with the prior art, the invention has the following advantages:

the scroll spring can form raised moment-adjusting raised edges on two sides of the width direction of the pull-out part when the reed of the scroll spring is opened, thus, when the pulling part of the reed is expanded by force, the pulling part can release potential energy accumulated in a winding state to supplement the acting force required for driving the pulling part to expand, thereby reducing the torque requirement of the stretching of the pulling part, further setting the tilting degree of the torque adjusting tilting edge to be gradually increased from the outer ring to the inner ring, so that the design ensures that the torque of the outer ring with large curvature radius is reduced less, the torque of the inner ring with small curvature radius is obviously reduced, so that the formed spiral spring can realize that the torque is larger when the outer ring has larger curvature radius but is opened, the torque is smaller when the inner ring has smaller curvature radius, thereby better meeting the requirements of retraction driving stress of the curtain and ensuring convenient installation without an additional locking structure. Therefore, the curvature of the reed can be changed at any point within the length range of the spiral spring according to the requirements of the application occasion, so as to obtain a variable torsion value, and the curtain can be drawn and drawn to obtain more comfortable hand feeling when in use.

Drawings

FIG. 1 is a schematic front view of a spiral spring according to an embodiment.

Fig. 2 is an enlarged view of a portion a in fig. 1.

FIG. 3 is a schematic side view of a spiral spring according to an embodiment of the present invention.

FIG. 4 is a schematic cross-sectional view of a drawn part in the first embodiment.

FIG. 5 is a schematic cross-sectional view of a drawn part in the second embodiment.

In the figure, 1, reed; 2. a pull-out portion; 3. adjusting the moment and warping the edge.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.