KR101269776B1 - Blind system having changeable gear ratio - Google Patents

Abstract

The present invention relates to an electric blind system capable of shifting gears by adjusting the rotational speed of the motor to various acceleration and deceleration speeds so that the user can conveniently wind or unwind the blind fabric, and includes a motor operated by power supply. And a driving unit equipped with a driving gear on the rotating shaft of the motor. A follower that can select and mount any one of a plurality of driven gears of different diameter sizes on one side of the winding roll to which the blind fabric is wound; And a mounting bracket disposed in close contact with the driving unit and the follower, and one side of the mounting bracket is provided with auxiliary gears and is geared to the driving gear, and is driven to the driven gear of the follower and driven from the driving gear. It consists of a configuration including a; speed adjusting unit for adjusting the acceleration and deceleration transmitted to the gear.
According to the present invention, the user can easily adjust the gear ratio transmitted from the driving gear connected to the motor to the driven gear connected to the take-up roll, thereby winding or unwinding the blind fabric at a desired take-up speed, thereby making it more convenient to use. An improved effect is obtained.

Description

Electric blind system with gear shifting {BLIND SYSTEM HAVING CHANGEABLE GEAR RATIO}

The present invention relates to a blind system that can be automated by winding or unwinding blind fabric by using an electric motor, and more specifically, in a process of forward and reverse rotation of a winding roll on which the blind fabric is wound using a rotational force driven by a motor. The user can easily adjust the gear ratio transmitted from the drive gear connected to the motor to the driven gear connected to the take-up roll, so that the user can conveniently wind or unwind the blind fabric by adjusting the motor rotation speed to various acceleration / deceleration speeds. The invention relates to an electric blind system capable of gear shifting.

Generally, curtains and window blinds have been installed and used in homes and offices due to problems such as privacy protection, lighting, and heating.

Conventional blind system has a blind fabric to be disposed adjacent to the window and the like to shield the room, and has a single winding roll for winding the blind fabric, one side of the winding roll has a chain wheel and an operation chain for rotating it It is equipped structure.

Such a conventional blind system is a so-called "single-roll blind system". When the blind fabric disposed adjacent to the window is wound around the take-up roll, the blind fabric is lifted to the upper side to open the window, and the light is transmitted. On the contrary, when the blind fabric is released from the take-up roll, the blind fabric descends to the lower side to cover the window to shade the room.

Such a conventional single roll blind system is a type for moving one piece of blind fabric up and down, and the user has to rotate the winding roll forward and backward using an operation chain provided on one side of the take-up roll. have.

In addition, since the conventional single roll blind system opens and shields the interior using one blind fabric, the structural limitation has a limitation in that the interior space can not be shielded or flooded as desired by the user. .

In order to solve such a problem, "Dual roll blind system" of Korean Patent No. 10-0768403 developed by the applicant of the present invention has been proposed.

The conventional dual roll blind system includes a plurality of upper and lower winding rolls, and upper and lower ends thereof are fixed to the upper and lower winding rolls, respectively, and the first and second transparent rollers having a constant width and an opaque portion are alternately formed in the width direction. And a second blind fabric each disposed.

In this dual roll blind system, the first blind fabric is moved from side to side with respect to the second blind fabric so that the opaque portions overlap with each other and overlap with each other, and the opaque portion and the transparent portion are aligned with each other. It can be conveniently used by converting it into a shading state that blocks light.

However, the conventional dual roll blind system, despite its ease of use, by using the operation chain provided on one side of the upper winding roll in order to raise and lower the first and second blind fabric up and down, it is reversed Since the user has to pull the operation chain every time, this also has an inconvenience in operation.

Therefore, in order to add to the user's convenience, there is an urgent need for the development of a technology for an automated blind system that operates electrically using a motor.

An object of the present invention is to solve the conventional problems as described above, the user conveniently operates the remote control to forward and reverse the motor, using the forward and reverse rotation of the motor wound winding fabric wound The user can conveniently wind or unwind the blind fabric by rotating the motor, and the user can easily adjust the gear ratio transmitted from the drive gear connected to the motor arbitrarily to the driven gear connected to the take-up roll. The present invention provides an electric blind system capable of shifting gears, which is controlled by acceleration and deceleration speeds, for easier use.

In order to achieve the above object, the present invention, in the blind system to wind the blind fabric wound on the winding roll to open the room, or unwind from the winding roll to shield the interior,

A driving unit having a motor operated by power supply, the rotating shaft of the motor having a driving gear mounted thereon;

A follower that can select and mount any one of a plurality of driven gears of different diameter sizes on one side of the winding roll to which the blind fabric is wound; And

The mounting bracket is provided in close contact with the driving unit and the follower, and one side of the mounting bracket is provided with auxiliary gears and is geared to the driving gear, and is geared to the driven gear of the follower and driven from the driving gear. Speed adjustment unit for adjusting the acceleration and deceleration transmitted to the; including the rotation of the winding roll wound the blind fabric by using the forward and reverse rotation of the motor, including the transmission and rotation of the blind fabric to enable electric transmission Provide a blind system.

In addition, the present invention preferably the motor of the drive unit is the rotation axis of the drive gear is inserted in the center of the drive gear to transmit the rotational force, the end of the rotation shaft is the inner side of the bearing integrally fixed to the upper side of the mounting bracket It is fitted to the, and the spacer ring is mounted between the drive gear and the bearing, to provide a gear shift capable of shifting the gear to space between the drive gear and the bearing, to achieve a smooth rotation of the drive gear.

And the present invention is preferably the mounting bracket is integrally fixed through a plurality of screws at one end of the mounting cover in which the motor is built, a plurality of first and second auxiliary gears between the drive gear and the driven gear The first auxiliary gear is geared to the driving gear, the second auxiliary gear is geared to the first auxiliary gear, and the driven gear is geared to the second auxiliary gear to be transmitted from the driving gear to the driven gear. An electric blind system capable of shifting gears configured to adjust the rotational speed ratio is provided.

In addition, the present invention preferably the mounting bracket is formed on one side of the first shaft to be mounted so that the first auxiliary gear is rotatable, the first shaft is fitted with an upper hole between the first auxiliary gear and the mounting bracket While the auxiliary bracket is disposed and connected to be rotatable with respect to the first shaft, one side of the auxiliary bracket forms a second shaft on which one side is mounted so that the second auxiliary gear is rotatable, and the auxiliary bracket has a second shaft. A screw hole is formed on the lower side of the mounting bracket, so that the screw penetrating the adjustment hole of the mounting bracket is coupled to the screw hole to provide a gear shifting electric blind system that is positioned on the mounting bracket.

And the present invention is preferably the mounting bracket is formed a plurality of adjustment holes in the same radius around the first shaft, the adjustment holes are formed in a plurality of one side upward while forming an arc from directly below the first shaft The auxiliary bracket has a screw hole which is sequentially moved upward by one side from the lower adjustment hole of the first shaft to be fixed by each adjustment hole, and the driven gear is provided with the screw hole of the auxiliary bracket. One of the different diameters for each adjustment hole is selected and geared to the second auxiliary gear so that the rotational speed transmitted from the drive gear to the driven gear through the first and second auxiliary gears can be adjusted. It provides an electric blind system capable of configured gear shifting.

In addition, the present invention preferably is that when the screw hole of the auxiliary bracket is coupled to the lower adjustment hole of the first shaft, the driven gear of the smallest diameter among the plurality of driven gears having various diameters is mounted on the take-up roll. By gear coupling to the second auxiliary gear is the highest acceleration speed control with respect to the rotational speed of the drive gear, and the screw hole of the auxiliary bracket is moved to one side upward from the lower adjustment hole of the first shaft The diameter of the driven gear is gradually increased as it is coupled to each adjustment hole, and the rate of increase of the driven gear accelerated with respect to the rotational speed of the drive gear is gradually lowered, and the screw hole of the auxiliary bracket is located at the uppermost adjustment hole. When combined, the driven gear of the largest diameter is mounted and the rotational speed of the drive gear About it provides a possible motorized blinds and the reduced speed adjustment system gear shifting takes place.

The electric blind system capable of shifting gears according to the present invention allows the user to conveniently operate the remote control to forward and reverse the motor, and in the process of rotating the winding roll wound by the blind fabric using the forward and reverse rotation of the motor. By separating the mounting bracket from the mounting cover, positioning the second auxiliary gear position on the auxiliary bracket on the adjustment hole of the mounting bracket, and then in position of the second auxiliary gear among the plurality of driven gears of different diameters. Select the corresponding driven gear and install it on the take-up roll.

In this way, the position of the second auxiliary gear is adjusted, and any one of a plurality of driven gears having a diameter of various sizes is selected and mounted on the take-up roll, and gears are engaged to the second auxiliary gear. The gear ratio transmitted from the drive gear connected to the motor to the driven gear connected to the take-up roll can be easily adjusted, so that the user can wind or unwind the blind fabric at the desired take-up speed. Obtained.

1 is a side cross-sectional view showing an overall gear shiftable electric blind system according to the present invention.
2 is a cross-sectional view showing a coupling structure of a drive unit, a speed control unit and a follower provided in the electric blind system capable of shifting gears according to the present invention.
Figure 3a is an explanatory view showing a drive gear provided in the electric blind system capable of shifting gears according to the present invention.
3B is an explanatory view showing a driven gear provided in the electric blind system capable of shifting gears according to the present invention.
Figure 4a is a cross-sectional view showing a speed control unit provided in the electric blind system capable of shifting gears in accordance with the present invention.
Figure 4b is a side view showing a speed control unit provided in the electric blind system capable of shifting gears in accordance with the present invention.
5a to 5e is a speed adjusting unit provided in the gear shiftable electric blind system according to the present invention, the second auxiliary gear on the auxiliary bracket is capable of changing the position on the adjustment hole, accordingly driven gears of different diameters It is an operation explanatory drawing which shows the structure by which the rotation speed from a drive gear is attached and accelerated and decelerated.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, the electric blind system 100 capable of shifting gears is electrically operated using a motor 105, and includes a motor 105 operated by power supply. The rotating shaft 105a of the motor 105 has a driving unit 110 on which a driving gear 114 is mounted.

The motor 105 of the driving unit 110 is configured so that the user can remotely control the on-off of the motor 105 through a separate remote controller controller (not shown).

As shown in FIG. 2, the driving unit 110 transmits a rotational force to the driving gear 114 by being fitted at the center of the driving gear 114 as shown in FIG. 2. The end of 105a) is fitted inside the bearing 122 which is integrally fixed to the upper side of the mounting bracket 152.

In addition, a spacer ring 124 is mounted between the drive gear 114 and the bearing 122, so as to space between the drive gear 114 and the bearing 122, so as to smoothly rotate the drive gear 114. It is composed.

As shown in FIG. 3A, the driving gear 114 of the driving unit 110 includes a through hole 116 through which the polygonal cross-section rotation shaft 105a of the motor 105 penetrates and is inserted in the center thereof. It is a structure in which the circular drive gear surface 114a was formed in the surface.

As described above, the bearing 122 rotatably supporting the rotation shaft 105a of the motor 105 into which the center through hole 116 of the drive gear 114 is inserted will be described later, as shown in FIG. 4A. As integrally fixed to the upper side of the mounting bracket 152, the end of the rotating shaft 105a of the motor 105 is free to rotate.

In addition, the gear shiftable electric blind system 100 according to the present invention selects any one of a plurality of driven gears 132 having different diameter sizes on one side of a winding roll R on which a blind fabric (not shown) is wound. It is provided with a follower 130 that can be mounted.

As the driven gear 132 of the driven unit 130 is shown in Figure 3b, in order to be mounted on the take-up roll (R), an adapter 140 is provided on one side, the fitting is connected to the adapter 140 A circular driven gear surface 136a is formed at one side of the portion 134 and the fitting portion 134.

As the driven gear 132 is fixed to one side of the take-up roll R, as shown in Figure 2, the adapter 140, the fitting portion 134 to the inside of such an adapter 140 Inserted and splined to each other, the driven gear surface 136a provided on one side of the fitting portion 134 is geared to the second auxiliary gear 160b to be described later.

Such driven gear 132 is provided with a plurality of different diameter sizes of the driven gear surface 136a, and as described later, according to the mounting position of the second auxiliary gear 160b, as appropriate, A driven gear 132 having a gear-driven driven gear surface 136a is selected from several and fixed to the adapter 140.

In addition, the gear shiftable electric blind system 100 according to the present invention includes a speed adjusting unit 150 for accelerating and decelerating a rotation speed transmitted from the driving gear 114 to the driven gear 132. The speed adjusting unit 150 has a mounting bracket 152 which is disposed in close contact with the driving unit 110 and the driven unit 130, the auxiliary gear (160a, 160b) on one side of the mounting bracket 152 And gear driven between the drive gear 114 and the driven gear 132 of the follower 130.

As shown in FIG. 2, the mounting bracket 152 is fixed integrally through a plurality of screws 156 at one end of the mounting cover 154 in which the motor 105 is embedded, and the driving gear ( A plurality of first and second auxiliary gears 160a and 160b are disposed between 114 and the driven gear 132 to transmit the rotational force of the drive gear 114 to the driven gear 132.

That is, the auxiliary gears 160a and 160b of the speed adjusting unit 150 are preferably composed of two, but the present invention is not limited thereto and may be made of various gear combinations such as three to six. .

The speed adjusting unit 150 has the first auxiliary gear 160a geared to the drive gear 114, the second auxiliary gear 160b is geared to the first auxiliary gear 160a. The driven gear 132 is gear-coupled to the second auxiliary gear 160b to adjust the rotation speed ratio transmitted from the drive gear 114 to the driven gear 132.

As shown in FIG. 4A, the mounting bracket 152 forms a first shaft 166 on one side to which the first auxiliary gear 160a is rotatably mounted, and the first shaft 166 An auxiliary bracket 170 into which the upper hole 172 is fitted is disposed between the first auxiliary gear 160a and the mounting bracket 152 so as to be rotatable with respect to the first shaft 166.

In addition, one side of the auxiliary bracket 170 forms a second shaft 174 on which one side of the second auxiliary gear 160b is rotatably mounted, and the auxiliary bracket 170 of the second shaft 174 A screw 182 that forms a screw hole 176 on the lower side and penetrates the adjusting hole 168 of the mounting bracket 152 is coupled to the screw hole 176, as shown in cross section in FIG. The bracket 170 and the mounting bracket 152 are structured to be mutually fixed.

In addition, the mounting bracket 152 forms a plurality of adjustment holes 168 within the same radius around the first shaft 166, as shown in FIG. 4B. The auxiliary bracket 170 has a screw hole 176 and a lower adjustment hole 168 of the first shaft 166. The position is sequentially moved from one side upward from each other to fix the position by each adjustment hole 168.

That is, in this way, the auxiliary bracket 170 is circularly moved from one side upwards while being circularly moved from the lower adjustment hole 168 of the first shaft 166 to the center of the first shaft 166, and then the screw ( 182, the adjustment hole 168 and the screw hole 176 of the mounting bracket 152 is coupled, and is fixed in the position of the desired adjustment hole (168).

When the auxiliary bracket 170 is moved as described above, the driven gear 132 may have any one of different diameters for each adjustment hole 168 in which the screw hole 176 of the auxiliary bracket 170 is located. By being selected and geared to the second auxiliary gear 160b, acceleration / deceleration can be controlled by the rotation speed transmitted from the driving gear 114 to the driven gear 132 through the first and second auxiliary gears 160a and 160b. It is configured to be.

5A to 5E illustrate a structure in which driven gears 132 having different diameters are coupled according to the positional change of the second auxiliary gear 160b.

That is, as shown in Figure 5a, when the screw hole 176 of the auxiliary bracket 170 is coupled to the direct adjustment hole 168 of the first shaft 166 by a screw 182, Among the plurality of driven gears 132 having a diameter, the driven gear 132 having the smallest diameter is mounted on the take-up roll R and gear-coupled to the second auxiliary gear 160b to rotate the rotational speed of the drive gear 114. The highest acceleration speed control is achieved for.

5B to 5D, the screw hole 176 of the auxiliary bracket 170 is moved from the lower adjustment hole 168 of the first shaft 166 to one side upward and screwed. The diameter of the driven gear 132 is gradually increased as it is coupled to each adjustment hole 168 by 182, so that the rate of increase of the driven gear 132 accelerated with respect to the rotational speed of the drive gear 114 is gradually increased. Will be lowered.

In addition, when the screw hole 176 is engaged in the adjustment hole 168 located at the uppermost side during the movement of the auxiliary bracket 170, as shown in FIG. 5E, the largest diameter driven gear ( 132 is mounted to the deceleration speed adjustment with respect to the rotational speed of the drive gear 114.

The gear shiftable electric blind system 100 according to the present invention configured as described above is configured so that a user can remotely control the on-off of the motor 105 through a separate remote controller controller (not shown).

Such a motor 105 of the drive unit 110 is a motor 105 that is normally capable of forward and reverse rotation, and the user remotely controls the forward, reverse rotation and stop operation of the motor 105 through a remote controller controller (not shown). It is easy to operate.

As the motor 105 of the driving unit 110 operates as described above, the driving gear 114 rotates, and the driving unit 130 of the driven unit 130 passes through the first and second auxiliary gears 160a and 160b of the mounting bracket 152. Rotate the driven gear 132.

Accordingly, the driven gear 132 rotates the take-up roll R through the adapter 140 while rotating in the desired direction, and winds up the blind fabric (not shown) wound around the take-up roll R to the take-up roll R. Will be given or released.

As described above, the present invention greatly improves the convenience of use because the user can conveniently wind or unwind the blind fabric by using the forward and reverse rotation of the motor 105.

In addition, in such an operation process, the user can easily adjust the gear ratio transmitted from the drive gear 114 connected to the motor 105 to the driven gear 132 connected to the take-up roll R, and adjust the speed to various acceleration and deceleration speeds. It is convenient to use.

In this case, in order for the user to adjust the gear ratio, as shown in FIG. 2, a plurality of screws of the mounting bracket 152 integrally fixed to one end of the mounting cover 154 in which the motor 105 is embedded ( 156 to release the mounting bracket 152 from the mounting cover 154.

Then, the position of the second auxiliary gear 160b on the mounting cover 154 is changed. At this time, the fixing hole 168 of the mounting bracket 152 penetrates the screw hole 176 of the auxiliary bracket 170. The screw 182 is released to allow the auxiliary bracket 170 to rotate about the first shaft 166, and then rotate to the adjustment hole 168 at a desired position to be fixed again through the screw 182.

In addition, after the position adjustment of the second auxiliary gear 160b is completed as described above, by selecting one of the driven gears 132 of different diameters and fixing them to the adapter 140, the second auxiliary gear 160b may be connected to the second auxiliary gear 160b. The driven gear 132 is engaged with each other.

The coupling structure of the driven gears 132 having different diameters according to the position adjustment of the second auxiliary gear 160b is shown in FIGS. 5A to 5E.

That is, as shown in Figure 5a, when the screw hole 176 of the auxiliary bracket 170 is coupled to the lower adjustment hole 168 of the first shaft 166, the driven gear 132 of the smallest diameter Is mounted on the take-up roll (R) is geared to the second auxiliary gear (160b) to achieve the highest acceleration speed control with respect to the rotational speed of the drive gear 114.

5B to 5D, the screw holes 176 of the auxiliary bracket 170 are moved from one side upward adjustment hole 168 of the first shaft 166 to one side upward. The diameter of the driven gear 132 is gradually increased as it is coupled to the adjustment hole 168 of the acceleration rate is gradually lowered.

In addition, when the screw hole 176 is engaged in the adjustment hole 168 located at the uppermost side during the movement of the auxiliary bracket 170, as shown in FIG. 5E, the largest diameter driven gear ( 132 is mounted to the deceleration speed adjustment with respect to the rotational speed of the drive gear 114.

As such, in order to change-mount the driven gears 132 having different diameters according to the fixed position of the second sub-gear 160b, the driven gears 132 having different diameters are provided to the user in advance. Of course, it can be replaced.

As described above, the electric blind system 100 capable of shifting gears according to the present invention allows the user to conveniently operate the remote controller to forward and reverse the motor 105, and use the forward and reverse rotation of the motor 105. In the process of rotating the winding roll (R) wound by the blind fabric (not shown), the mounting bracket 152 is separated from the mounting cover 154 to position the second auxiliary gear 160b on the auxiliary bracket 170. After positioning on the adjustment hole 168 of the mounting bracket 152, the driven gear 132 corresponding to the position of the second auxiliary gear 160b among the plurality of driven gears 132 having different diameters. Select and mount on the take-up roll (R).

As such, the position of the second auxiliary gear 160b is adjusted, and any one of the plurality of driven gears 132 having various diameters corresponding thereto is selected and mounted on the winding roll R, and the second auxiliary gear By gear coupling to the gear 160b, the user can easily adjust the gear ratio transmitted from the drive gear 114 connected to the motor 105 to the driven gear 132 connected to the take-up roll R by the user easily. The user can wind or unwind the blind fabric at the desired winding speed, making it more convenient to use.

Although the present invention has been described in detail with reference to specific embodiments thereof with reference to the accompanying drawings, the present invention is not limited to such specific structures. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the following claims. However, it is intended that the present invention covers all such modifications and variations as fall within the true scope of the invention.

100: electric blind system with gear shift
105: motor 105a: rotating shaft
110: drive unit 114: drive gear
114a: drive gear surface 116: through hole
122: bearing 124: spacer ring
130: driven part 132: driven gear
134: fitting 136a: driven gear face
140: adapter 150: speed control unit
152: mounting bracket 154: mounting cover
156: screw 160a, 160b: first and second auxiliary gear
166: first shaft 168: adjustment hole
170: auxiliary bracket 172: upper hole
174: second shaft 176: screw hole
182: screw R: winding roll

Claims (5)

In a blind system in which a blind fabric is wound on a take-up roll to open the room, or a film is unshielded from the take-up roll to shield the room.
A driving unit having a motor operated by power supply, the rotating shaft of the motor having a driving gear mounted thereon;
A follower that can select and mount any one of a plurality of driven gears of different diameter sizes on one side of the winding roll to which the blind fabric is wound; And
The mounting bracket is provided in close contact with the driving unit and the follower, and one side of the mounting bracket is provided with auxiliary gears and is geared to the driving gear, and is geared to the driven gear of the follower and driven from the driving gear. It includes; Speed control unit for adjusting the acceleration and deceleration transmitted to the;
A plurality of first and second auxiliary gears are disposed between the drive gear and the driven gear, the first auxiliary gear is gear-coupled to the drive gear, the second auxiliary gear is gear-coupled to the first auxiliary gear, and the driven The gear shifting electric blind system, characterized in that the gear is geared to the second auxiliary gear to adjust the rotational speed ratio transmitted from the drive gear to the driven gear. delete The auxiliary mounting bracket of claim 1, wherein the mounting bracket forms a first shaft on which one side of the first auxiliary gear is rotatably mounted, and an upper hole is inserted into the first shaft between the first auxiliary gear and the mounting bracket. The bracket is disposed and connected to be rotatable with respect to the first shaft, while one side of the auxiliary bracket is formed with a second shaft on which one side is mounted so that the second auxiliary gear is rotatable. And a screw hole penetrating the adjusting hole of the mounting bracket so that the screw hole is coupled to the screw hole and fixedly positioned on the mounting bracket. The method of claim 3, wherein the mounting bracket is formed around a plurality of adjustment holes in the same radius around the first shaft, the adjustment holes are formed in a plurality of one side upward while forming an arc from directly below the first shaft The auxiliary brackets have their screw holes sequentially moved one side upwards from the lower adjustment holes of the first shaft to be fixed by respective adjustment holes, and the driven gears each have the screw holes of the auxiliary brackets positioned thereon. Any one of the different diameters is selected for the adjusting hole of and is geared to the second auxiliary gear so that the rotation speed transmitted from the driving gear to the driven gear through the first and second auxiliary gears can be adjusted. Electric blind system capable of shifting gears, characterized in that. 5. The method according to claim 4, wherein when the screw hole of the auxiliary bracket is engaged with the lower adjustment hole of the first shaft, the driven gear having the smallest diameter among the plurality of driven gears having various diameters is mounted on the take-up roll. By gear-coupling with the second auxiliary gear, the highest acceleration speed adjustment is achieved with respect to the rotational speed of the drive gear, and the screw holes of the auxiliary brackets are moved upwards from the lower adjustment holes of the first shaft toward one side upward. The diameter of the driven gear is gradually increased as it is coupled to the adjustment hole of, so that the rate of increase of the driven gear accelerated with respect to the rotational speed of the drive gear is gradually decreased, and the screw hole of the auxiliary bracket is located at the uppermost adjustment hole. When combined, the largest diameter driven gear is mounted to the rotational speed of the drive gear. The possible electric blind system of gear shift, characterized in that the speed control is made.

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